summaryrefslogtreecommitdiffstats
path: root/src/vlib/unix/cli.c
blob: f05388ce8b12ac65d74a4b008826a3ca5e8e7cc1 (plain)
1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38
39
40
41
42
43
44
45
46
47
48
49
50
51
52
53
54
55
56
57
58
59
60
61
62
63
64
65
66
67
68
69
70
71
72
73
74
75
76
77
78
79
80
81
82
83
84
85
86
87
88
89
90
91
92
93
94
95
96
97
98
99
100
101
102
103
104
105
106
107
108
109
110
111
112
113
114
115
116
117
118
119
120
121
122
123
124
125
126
127
128
129
130
131
132
133
134
135
136
137
138
139
140
141
142
143
144
145
146
147
148
149
150
151
152
153
154
155
156
157
158
159
160
161
162
163
164
165
166
167
168
169
170
171
172
173
174
175
176
177
178
179
180
181
182
183
184
185
186
187
188
189
190
191
192
193
194
195
196
197
198
199
200
201
202
203
204
205
206
207
208
209
210
211
212
213
214
215
216
217
218
219
220
221
222
223
224
225
226
227
228
229
230
231
232
233
234
235
236
237
238
239
240
241
242
243
244
245
246
247
248
249
250
251
252
253
254
255
256
257
258
259
260
261
262
263
264
265
266
267
268
269
270
271
272
273
274
275
276
277
278
279
280
281
282
283
284
285
286
287
288
289
290
291
292
293
294
295
296
297
298
299
300
301
302
303
304
305
306
307
308
309
310
311
312
313
314
315
316
317
318
319
320
321
322
323
324
325
326
327
328
329
330
331
332
333
334
335
336
337
338
339
340
341
342
343
344
345
346
347
348
349
350
351
352
353
354
355
356
357
358
359
360
361
362
363
364
365
366
367
368
369
370
371
372
373
374
375
376
377
378
379
380
381
382
383
384
385
386
387
388
389
390
391
392
393
394
395
396
397
398
399
400
401
402
403
404
405
406
407
408
409
410
411
412
413
414
415
416
417
418
419
420
421
422
423
424
425
426
427
428
429
430
431
432
433
434
435
436
437
438
439
440
441
442
443
444
445
446
447
448
449
450
451
452
453
454
455
456
457
458
459
460
461
462
463
464
465
466
467
468
469
470
471
472
473
474
475
476
477
478
479
480
481
482
483
484
485
486
487
488
489
490
491
492
493
494
495
496
497
498
499
500
501
502
503
504
505
506
507
508
509
510
511
512
513
514
515
516
517
518
519
520
521
522
523
524
525
526
527
528
529
530
531
532
533
534
535
536
537
538
539
540
541
542
543
544
545
546
547
548
549
550
551
552
553
554
555
556
557
558
559
560
561
562
563
564
565
566
567
568
569
570
571
572
573
574
575
576
577
578
579
580
581
582
583
584
585
586
587
588
589
590
591
592
593
594
595
596
597
598
599
600
601
602
603
604
605
606
607
608
609
610
611
612
613
614
615
616
617
618
619
620
621
622
623
624
625
626
627
628
629
630
631
632
633
634
635
636
637
638
639
640
641
642
643
644
645
646
647
648
649
650
651
652
653
654
655
656
657
658
659
660
661
662
663
664
665
666
667
668
669
670
671
672
673
674
675
676
677
678
679
680
681
682
683
684
685
686
687
688
689
690
691
692
693
694
695
696
697
698
699
700
701
702
703
704
705
706
707
708
709
710
711
712
713
714
715
716
717
718
719
720
721
722
723
724
725
726
727
728
729
730
731
732
733
734
735
736
737
738
739
740
741
742
743
744
745
746
747
748
749
750
751
752
753
754
755
756
757
758
759
760
761
762
763
764
765
766
767
768
769
770
771
772
773
774
775
776
777
778
779
780
781
782
783
784
785
786
787
788
789
790
791
792
793
794
795
796
797
798
799
800
801
802
803
804
805
806
807
808
809
810
811
812
813
814
815
816
817
818
819
820
821
822
823
824
825
826
827
828
829
830
831
832
833
834
835
836
837
838
839
840
841
842
843
844
845
846
847
848
849
850
851
852
853
854
855
856
857
858
859
860
861
862
863
864
865
866
867
868
869
870
871
872
873
874
875
876
877
878
879
880
881
882
883
884
885
886
887
888
889
890
891
892
893
894
895
896
897
898
899
900
901
902
903
904
905
906
907
908
909
910
911
912
913
914
915
916
917
918
919
920
921
922
923
924
925
926
927
928
929
930
931
932
933
934
935
936
937
938
939
940
941
942
943
944
945
946
947
948
949
950
951
952
953
954
955
956
957
958
959
960
961
962
963
964
965
966
967
968
969
970
971
972
973
974
975
976
977
978
979
980
981
982
983
984
985
986
987
988
989
990
991
992
993
994
995
996
997
998
999
1000
1001
1002
1003
1004
1005
1006
1007
1008
1009
1010
1011
1012
1013
1014
1015
1016
1017
1018
1019
1020
1021
1022
1023
1024
1025
1026
1027
1028
1029
1030
1031
1032
1033
1034
1035
1036
1037
1038
1039
1040
1041
1042
1043
1044
1045
1046
1047
1048
1049
1050
1051
1052
1053
1054
1055
1056
1057
1058
1059
1060
1061
1062
1063
1064
1065
1066
1067
1068
1069
1070
1071
1072
1073
1074
1075
1076
1077
1078
1079
1080
1081
1082
1083
1084
1085
1086
1087
1088
1089
1090
1091
1092
1093
1094
1095
1096
1097
1098
1099
1100
1101
1102
1103
1104
1105
1106
1107
1108
1109
1110
1111
1112
1113
1114
1115
1116
1117
1118
1119
1120
1121
1122
1123
1124
1125
1126
1127
1128
1129
1130
1131
1132
1133
1134
1135
1136
1137
1138
1139
1140
1141
1142
1143
1144
1145
1146
1147
1148
1149
1150
1151
1152
1153
1154
1155
1156
1157
1158
1159
1160
1161
1162
1163
1164
1165
1166
1167
1168
1169
1170
1171
1172
1173
1174
1175
1176
1177
1178
1179
1180
1181
1182
1183
1184
1185
1186
1187
1188
1189
1190
1191
1192
1193
1194
1195
1196
1197
1198
1199
1200
1201
1202
1203
1204
1205
1206
1207
1208
1209
1210
1211
1212
1213
1214
1215
1216
1217
1218
1219
1220
1221
1222
1223
1224
1225
1226
1227
1228
1229
1230
1231
1232
1233
1234
1235
1236
1237
1238
1239
1240
1241
1242
1243
1244
1245
1246
1247
1248
1249
1250
1251
1252
1253
1254
1255
1256
1257
1258
1259
1260
1261
1262
1263
1264
1265
1266
1267
1268
1269
1270
1271
1272
1273
1274
1275
1276
1277
1278
1279
1280
1281
1282
1283
1284
1285
1286
1287
1288
1289
1290
1291
1292
1293
1294
1295
1296
1297
1298
1299
1300
1301
1302
1303
1304
1305
1306
1307
1308
1309
1310
1311
1312
1313
1314
1315
1316
1317
1318
1319
1320
1321
1322
1323
1324
1325
1326
1327
1328
1329
1330
1331
1332
1333
1334
1335
1336
1337
1338
1339
1340
1341
1342
1343
1344
1345
1346
1347
1348
1349
1350
1351
1352
1353
1354
1355
1356
1357
1358
1359
1360
1361
1362
1363
1364
1365
1366
1367
1368
1369
1370
1371
1372
1373
1374
1375
1376
1377
1378
1379
1380
1381
1382
1383
1384
1385
1386
1387
1388
1389
1390
1391
1392
1393
1394
1395
1396
1397
1398
1399
1400
1401
1402
1403
1404
1405
1406
1407
1408
1409
1410
1411
1412
1413
1414
1415
1416
1417
1418
1419
1420
1421
1422
1423
1424
1425
1426
1427
1428
1429
1430
1431
1432
1433
1434
1435
1436
1437
1438
1439
1440
1441
1442
1443
1444
1445
1446
1447
1448
1449
1450
1451
1452
1453
1454
1455
1456
1457
1458
1459
1460
1461
1462
1463
1464
1465
1466
1467
1468
1469
1470
1471
1472
1473
1474
1475
1476
1477
1478
1479
1480
1481
1482
1483
1484
1485
1486
1487
1488
1489
1490
1491
1492
1493
1494
1495
1496
1497
1498
1499
1500
1501
1502
1503
1504
1505
1506
1507
1508
1509
1510
1511
1512
1513
1514
1515
1516
1517
1518
1519
1520
1521
1522
1523
1524
1525
1526
1527
1528
1529
1530
1531
1532
1533
1534
1535
1536
1537
1538
1539
1540
1541
1542
1543
1544
1545
1546
1547
1548
1549
1550
1551
1552
1553
1554
1555
1556
1557
1558
1559
1560
1561
1562
1563
1564
1565
1566
1567
1568
1569
1570
1571
1572
1573
1574
1575
1576
1577
1578
1579
1580
1581
1582
1583
1584
1585
1586
1587
1588
1589
1590
1591
1592
1593
1594
1595
1596
1597
1598
1599
1600
1601
1602
1603
1604
1605
1606
1607
1608
1609
1610
1611
1612
1613
1614
1615
1616
1617
1618
1619
1620
1621
1622
1623
1624
1625
1626
1627
1628
1629
1630
1631
1632
1633
1634
1635
1636
1637
1638
1639
1640
1641
1642
1643
1644
1645
1646
1647
1648
1649
1650
1651
1652
1653
1654
1655
1656
1657
1658
1659
1660
1661
1662
1663
1664
1665
1666
1667
1668
1669
1670
1671
1672
1673
1674
1675
1676
1677
1678
1679
1680
1681
1682
1683
1684
1685
1686
1687
1688
1689
1690
1691
1692
1693
1694
1695
1696
1697
1698
1699
1700
1701
1702
1703
1704
1705
1706
1707
1708
1709
1710
1711
1712
1713
1714
1715
1716
1717
1718
1719
1720
1721
1722
1723
1724
1725
1726
1727
1728
1729
1730
1731
1732
1733
1734
1735
1736
1737
1738
1739
1740
1741
1742
1743
1744
1745
1746
1747
1748
1749
1750
1751
1752
1753
1754
1755
1756
1757
1758
1759
1760
1761
1762
1763
1764
1765
1766
1767
1768
1769
1770
1771
1772
1773
1774
1775
1776
1777
1778
1779
1780
1781
1782
1783
1784
1785
1786
1787
1788
1789
1790
1791
1792
1793
1794
1795
1796
1797
1798
1799
1800
1801
1802
1803
1804
1805
1806
1807
1808
1809
1810
1811
1812
1813
1814
1815
1816
1817
1818
1819
1820
1821
1822
1823
1824
1825
1826
1827
1828
1829
1830
1831
1832
1833
1834
1835
1836
1837
1838
1839
1840
1841
1842
1843
1844
1845
1846
1847
1848
1849
1850
1851
1852
1853
1854
1855
1856
1857
1858
1859
1860
1861
1862
1863
1864
1865
1866
1867
1868
1869
1870
1871
1872
1873
1874
1875
1876
1877
1878
1879
1880
1881
1882
1883
1884
1885
1886
1887
1888
1889
1890
1891
1892
1893
1894
1895
1896
1897
1898
1899
1900
1901
1902
1903
1904
1905
1906
1907
1908
1909
1910
1911
1912
1913
1914
1915
1916
1917
1918
1919
1920
1921
1922
1923
1924
1925
1926
1927
1928
1929
1930
1931
1932
1933
1934
1935
1936
1937
1938
1939
1940
1941
1942
1943
1944
1945
1946
1947
1948
1949
1950
1951
1952
1953
1954
1955
1956
1957
1958
1959
1960
1961
1962
1963
1964
1965
1966
1967
1968
1969
1970
1971
1972
1973
1974
1975
1976
1977
1978
1979
1980
1981
1982
1983
1984
1985
1986
1987
1988
1989
1990
1991
1992
1993
1994
1995
1996
1997
1998
1999
2000
2001
2002
2003
2004
2005
2006
2007
2008
2009
2010
2011
2012
2013
2014
2015
2016
2017
2018
2019
2020
2021
2022
2023
2024
2025
2026
2027
2028
2029
2030
2031
2032
2033
2034
2035
2036
2037
2038
2039
2040
2041
2042
2043
2044
2045
2046
2047
2048
2049
2050
2051
2052
2053
2054
2055
2056
2057
2058
2059
2060
2061
2062
2063
2064
2065
2066
2067
2068
2069
2070
2071
2072
2073
2074
2075
2076
2077
2078
2079
2080
2081
2082
2083
2084
2085
2086
2087
2088
2089
2090
2091
2092
2093
2094
2095
2096
2097
2098
2099
2100
2101
2102
2103
2104
2105
2106
2107
2108
2109
2110
2111
2112
2113
2114
2115
2116
2117
2118
2119
2120
2121
2122
2123
2124
2125
2126
2127
2128
2129
2130
2131
2132
2133
2134
2135
2136
2137
2138
2139
2140
2141
2142
2143
2144
2145
2146
2147
2148
2149
2150
2151
2152
2153
2154
2155
2156
2157
2158
2159
2160
2161
2162
2163
2164
2165
2166
2167
2168
2169
2170
2171
2172
2173
2174
2175
2176
2177
2178
2179
2180
2181
2182
2183
2184
2185
2186
2187
2188
2189
2190
2191
2192
2193
2194
2195
2196
2197
2198
2199
2200
2201
2202
2203
2204
2205
2206
2207
2208
2209
2210
2211
2212
2213
2214
2215
2216
2217
2218
2219
2220
2221
2222
2223
2224
2225
2226
2227
2228
2229
2230
2231
2232
2233
2234
2235
2236
2237
2238
2239
2240
2241
2242
2243
2244
2245
2246
2247
2248
2249
2250
2251
2252
2253
2254
2255
2256
2257
2258
2259
2260
2261
2262
2263
2264
2265
2266
2267
2268
2269
2270
2271
2272
2273
2274
2275
2276
2277
2278
2279
2280
2281
2282
2283
2284
2285
2286
2287
2288
2289
2290
2291
2292
2293
2294
2295
2296
2297
2298
2299
2300
2301
2302
2303
2304
2305
2306
2307
2308
2309
2310
2311
2312
2313
2314
2315
2316
2317
2318
2319
2320
2321
2322
2323
2324
2325
2326
2327
2328
2329
2330
2331
2332
2333
2334
2335
2336
2337
2338
2339
2340
2341
2342
2343
2344
2345
2346
2347
2348
2349
2350
2351
2352
2353
2354
2355
2356
2357
2358
2359
2360
2361
2362
2363
2364
2365
2366
2367
2368
2369
2370
2371
2372
2373
2374
2375
2376
2377
2378
2379
2380
2381
2382
2383
2384
2385
2386
2387
2388
2389
2390
2391
2392
2393
2394
2395
2396
2397
2398
2399
2400
2401
2402
2403
2404
2405
2406
2407
2408
2409
2410
2411
2412
2413
2414
2415
2416
2417
2418
2419
2420
2421
2422
2423
2424
2425
2426
2427
2428
2429
2430
2431
2432
2433
2434
2435
2436
2437
2438
2439
2440
2441
2442
2443
2444
2445
2446
2447
2448
2449
2450
2451
2452
2453
2454
2455
2456
2457
2458
2459
2460
2461
2462
2463
2464
2465
2466
2467
2468
2469
2470
2471
2472
2473
2474
2475
2476
2477
2478
2479
2480
2481
2482
2483
2484
2485
2486
2487
2488
2489
2490
2491
2492
2493
2494
2495
2496
2497
2498
2499
2500
2501
2502
2503
2504
2505
2506
2507
2508
2509
2510
2511
2512
2513
2514
2515
2516
2517
2518
2519
2520
2521
2522
2523
2524
2525
2526
2527
2528
2529
2530
2531
2532
2533
2534
2535
2536
2537
2538
2539
2540
2541
2542
2543
2544
2545
2546
2547
2548
2549
2550
2551
2552
2553
2554
2555
2556
2557
2558
2559
2560
2561
2562
2563
2564
2565
2566
2567
2568
2569
2570
2571
2572
2573
2574
2575
2576
2577
2578
2579
2580
2581
2582
2583
2584
2585
2586
2587
2588
2589
2590
2591
2592
2593
2594
2595
2596
2597
2598
2599
2600
2601
2602
2603
2604
2605
2606
2607
2608
2609
2610
2611
2612
2613
2614
2615
2616
2617
2618
2619
2620
2621
2622
2623
2624
2625
2626
2627
2628
2629
2630
2631
2632
2633
2634
2635
2636
2637
2638
2639
2640
2641
2642
2643
2644
2645
2646
2647
2648
2649
2650
2651
2652
2653
2654
2655
2656
2657
2658
2659
2660
2661
2662
2663
2664
2665
2666
2667
2668
2669
2670
2671
2672
2673
2674
2675
2676
2677
2678
2679
2680
2681
2682
2683
2684
2685
2686
2687
2688
2689
2690
2691
2692
2693
2694
2695
2696
2697
2698
2699
2700
2701
2702
2703
2704
2705
2706
2707
2708
2709
2710
2711
2712
2713
2714
2715
2716
2717
2718
2719
2720
2721
2722
2723
2724
2725
2726
2727
2728
2729
2730
2731
2732
2733
2734
2735
2736
2737
2738
2739
2740
2741
2742
2743
2744
2745
2746
2747
2748
2749
2750
2751
2752
2753
2754
2755
2756
2757
2758
2759
2760
2761
2762
2763
2764
2765
2766
2767
2768
2769
2770
2771
2772
2773
2774
2775
2776
2777
2778
2779
2780
2781
2782
2783
2784
2785
2786
2787
2788
2789
2790
2791
2792
2793
2794
2795
2796
2797
2798
2799
2800
2801
2802
2803
2804
2805
2806
2807
2808
2809
2810
2811
2812
2813
2814
2815
2816
2817
2818
2819
2820
2821
2822
2823
2824
2825
2826
2827
2828
2829
2830
2831
2832
2833
2834
2835
2836
2837
2838
2839
2840
2841
2842
2843
2844
2845
2846
2847
2848
2849
2850
2851
2852
2853
2854
2855
2856
2857
2858
2859
2860
2861
2862
2863
2864
2865
2866
2867
2868
2869
2870
2871
2872
2873
2874
2875
2876
2877
2878
2879
2880
2881
2882
2883
2884
2885
2886
2887
2888
2889
2890
2891
2892
2893
2894
2895
2896
2897
2898
2899
2900
2901
2902
2903
2904
2905
2906
2907
2908
2909
2910
2911
2912
2913
2914
2915
2916
2917
2918
2919
2920
2921
2922
2923
2924
2925
2926
2927
2928
2929
2930
2931
2932
2933
2934
2935
2936
2937
2938
2939
2940
2941
2942
2943
2944
2945
2946
2947
2948
2949
2950
2951
2952
2953
2954
2955
2956
2957
2958
2959
2960
2961
2962
2963
2964
2965
2966
2967
2968
2969
2970
2971
2972
2973
2974
2975
2976
2977
2978
2979
2980
2981
2982
2983
2984
2985
2986
2987
2988
2989
2990
2991
2992
2993
2994
2995
2996
2997
2998
2999
3000
3001
3002
3003
3004
3005
3006
3007
3008
3009
3010
3011
3012
3013
3014
3015
3016
3017
3018
3019
3020
3021
3022
3023
3024
3025
3026
3027
3028
3029
3030
3031
3032
3033
3034
3035
3036
3037
3038
3039
3040
3041
3042
3043
3044
3045
3046
3047
3048
3049
3050
3051
3052
3053
3054
3055
3056
3057
3058
3059
3060
3061
3062
3063
3064
3065
3066
3067
3068
3069
3070
3071
3072
3073
3074
3075
3076
3077
3078
3079
3080
3081
3082
3083
3084
3085
3086
3087
3088
3089
3090
3091
3092
3093
3094
3095
3096
3097
3098
3099
3100
3101
3102
3103
3104
3105
3106
3107
3108
3109
3110
3111
3112
3113
3114
3115
3116
3117
3118
3119
3120
3121
3122
3123
3124
3125
3126
3127
3128
3129
3130
3131
3132
3133
3134
3135
3136
3137
3138
3139
3140
3141
3142
3143
3144
3145
3146
3147
3148
3149
3150
3151
3152
3153
3154
3155
3156
3157
3158
3159
3160
3161
3162
3163
3164
3165
3166
3167
3168
3169
3170
3171
3172
3173
3174
3175
3176
3177
3178
3179
3180
3181
3182
3183
3184
3185
3186
3187
3188
3189
3190
3191
3192
3193
3194
3195
3196
3197
3198
3199
3200
3201
3202
3203
3204
3205
3206
3207
3208
3209
3210
3211
3212
3213
3214
3215
3216
3217
3218
3219
3220
3221
3222
3223
3224
3225
3226
3227
3228
3229
3230
3231
3232
3233
3234
3235
3236
3237
3238
3239
3240
3241
3242
3243
3244
3245
3246
3247
3248
3249
3250
3251
3252
3253
3254
3255
3256
3257
3258
3259
3260
3261
3262
3263
3264
3265
3266
3267
3268
3269
3270
3271
3272
3273
3274
3275
3276
3277
3278
3279
3280
3281
3282
3283
3284
3285
3286
3287
3288
3289
3290
3291
3292
3293
3294
3295
3296
3297
3298
3299
3300
3301
3302
3303
3304
3305
3306
3307
3308
3309
3310
3311
3312
3313
3314
3315
3316
3317
3318
3319
3320
3321
3322
3323
3324
3325
3326
3327
3328
3329
3330
3331
3332
3333
3334
3335
3336
3337
3338
3339
3340
3341
3342
3343
3344
3345
3346
3347
3348
3349
3350
3351
3352
3353
3354
3355
3356
3357
3358
3359
3360
3361
3362
3363
3364
3365
3366
3367
3368
3369
3370
3371
3372
3373
3374
3375
3376
3377
3378
3379
3380
3381
3382
3383
3384
3385
3386
3387
3388
3389
3390
3391
3392
3393
3394
3395
3396
3397
3398
3399
3400
3401
3402
3403
3404
3405
3406
3407
3408
3409
3410
3411
3412
3413
3414
3415
3416
3417
3418
3419
3420
3421
3422
3423
3424
3425
3426
3427
3428
3429
3430
3431
3432
3433
3434
3435
3436
3437
3438
3439
3440
3441
3442
3443
3444
3445
3446
3447
3448
3449
3450
3451
3452
3453
3454
3455
3456
3457
3458
3459
3460
3461
3462
3463
3464
3465
3466
3467
3468
3469
3470
3471
3472
3473
3474
3475
3476
3477
3478
3479
3480
3481
3482
3483
3484
3485
3486
3487
3488
3489
3490
3491
3492
3493
3494
3495
3496
3497
3498
3499
3500
3501
3502
3503
3504
3505
3506
3507
3508
3509
3510
3511
3512
3513
3514
3515
3516
3517
3518
3519
3520
3521
3522
3523
3524
3525
3526
3527
3528
3529
3530
3531
3532
3533
3534
3535
3536
3537
3538
3539
3540
3541
3542
3543
3544
3545
3546
3547
3548
3549
3550
3551
3552
3553
3554
3555
3556
3557
3558
3559
3560
3561
3562
3563
3564
3565
3566
3567
3568
3569
3570
3571
3572
3573
3574
3575
3576
3577
3578
3579
3580
3581
3582
3583
3584
3585
3586
3587
3588
3589
3590
3591
3592
3593
3594
3595
3596
3597
3598
3599
3600
3601
3602
3603
3604
3605
3606
3607
3608
3609
3610
3611
3612
3613
3614
3615
3616
3617
3618
3619
3620
3621
3622
3623
3624
3625
3626
3627
3628
3629
3630
3631
3632
3633
3634
3635
3636
3637
3638
3639
3640
3641
3642
3643
3644
3645
3646
3647
3648
3649
3650
3651
3652
3653
3654
3655
3656
3657
3658
3659
3660
3661
3662
3663
3664
3665
3666
3667
3668
3669
3670
3671
3672
3673
3674
3675
3676
3677
3678
3679
3680
3681
3682
3683
3684
3685
3686
3687
3688
3689
3690
3691
3692
3693
3694
3695
3696
3697
3698
3699
3700
3701
3702
3703
3704
3705
3706
3707
3708
3709
3710
3711
3712
3713
3714
3715
3716
3717
3718
3719
3720
3721
3722
3723
3724
3725
3726
3727
3728
3729
3730
3731
3732
3733
3734
3735
3736
3737
3738
3739
3740
3741
3742
3743
3744
3745
3746
3747
3748
3749
3750
3751
3752
3753
3754
3755
3756
3757
3758
3759
3760
3761
3762
3763
3764
3765
3766
3767
3768
3769
3770
3771
3772
3773
3774
3775
3776
3777
3778
3779
3780
3781
3782
3783
3784
3785
3786
3787
3788
3789
3790
3791
3792
3793
3794
3795
3796
3797
3798
3799
3800
3801
3802
3803
3804
3805
3806
3807
3808
3809
3810
3811
3812
3813
3814
3815
3816
3817
3818
3819
3820
3821
3822
3823
3824
3825
3826
3827
3828
3829
3830
3831
3832
3833
3834
3835
3836
3837
3838
3839
3840
3841
3842
3843
3844
3845
3846
3847
3848
3849
3850
3851
3852
3853
3854
3855
3856
3857
3858
3859
3860
3861
3862
3863
3864
3865
3866
3867
3868
3869
3870
/*
 * Copyright (c) 2015 Cisco and/or its affiliates.
 * Licensed under the Apache License, Version 2.0 (the "License");
 * you may not use this file except in compliance with the License.
 * You may obtain a copy of the License at:
 *
 *     http://www.apache.org/licenses/LICENSE-2.0
 *
 * Unless required by applicable law or agreed to in writing, software
 * distributed under the License is distributed on an "AS IS" BASIS,
 * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
 * See the License for the specific language governing permissions and
 * limitations under the License.
 */
/*
 * cli.c: Unix stdin/socket CLI.
 *
 * Copyright (c) 2008 Eliot Dresselhaus
 *
 * Permission is hereby granted, free of charge, to any person obtaining
 * a copy of this software and associated documentation files (the
 * "Software"), to deal in the Software without restriction, including
 * without limitation the rights to use, copy, modify, merge, publish,
 * distribute, sublicense, and/or sell copies of the Software, and to
 * permit persons to whom the Software is furnished to do so, subject to
 * the following conditions:
 *
 * The above copyright notice and this permission notice shall be
 * included in all copies or substantial portions of the Software.
 *
 *  THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND,
 *  EXPRESS OR IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF
 *  MERCHANTABILITY, FITNESS FOR A PARTICULAR PURPOSE AND
 *  NONINFRINGEMENT. IN NO EVENT SHALL THE AUTHORS OR COPYRIGHT HOLDERS BE
 *  LIABLE FOR ANY CLAIM, DAMAGES OR OTHER LIABILITY, WHETHER IN AN ACTION
 *  OF CONTRACT, TORT OR OTHERWISE, ARISING FROM, OUT OF OR IN CONNECTION
 *  WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE SOFTWARE.
 */
/**
 * @file
 * @brief Unix stdin/socket command line interface.
 * Provides a command line interface so humans can interact with VPP.
 * This is predominantly a debugging and testing mechanism.
 */
/*? %%clicmd:group_label Command line session %% ?*/
/*? %%syscfg:group_label Command line session %% ?*/

#include <vlib/vlib.h>
#include <vlib/unix/unix.h>

#include <ctype.h>
#include <fcntl.h>
#include <sys/stat.h>
#include <termios.h>
#include <signal.h>
#include <unistd.h>
#include <arpa/telnet.h>
#include <sys/ioctl.h>
#include <sys/types.h>
#include <unistd.h>
#include <limits.h>
#include <netinet/tcp.h>
#include <math.h>

/** ANSI escape code. */
#define ESC "\x1b"

/** ANSI Control Sequence Introducer. */
#define CSI ESC "["

/** ANSI clear screen. */
#define ANSI_CLEAR      CSI "2J" CSI "1;1H"
/** ANSI reset color settings. */
#define ANSI_RESET      CSI "0m"
/** ANSI Start bold text. */
#define ANSI_BOLD       CSI "1m"
/** ANSI Stop bold text. */
#define ANSI_DIM        CSI "2m"
/** ANSI Start dark red text. */
#define ANSI_DRED       ANSI_DIM CSI "31m"
/** ANSI Start bright red text. */
#define ANSI_BRED       ANSI_BOLD CSI "31m"
/** ANSI clear line cursor is on. */
#define ANSI_CLEARLINE  CSI "2K"
/** ANSI scroll screen down one line. */
#define ANSI_SCROLLDN   CSI "1T"
/** ANSI save cursor position. */
#define ANSI_SAVECURSOR CSI "s"
/** ANSI restore cursor position if previously saved. */
#define ANSI_RESTCURSOR CSI "u"

/** Maximum depth into a byte stream from which to compile a Telnet
 * protocol message. This is a safety measure. */
#define UNIX_CLI_MAX_DEPTH_TELNET 24

/** Maximum terminal width we will accept */
#define UNIX_CLI_MAX_TERMINAL_WIDTH 512
/** Maximum terminal height we will accept */
#define UNIX_CLI_MAX_TERMINAL_HEIGHT 512
/** Default terminal height */
#define UNIX_CLI_DEFAULT_TERMINAL_HEIGHT 24
/** Default terminal width */
#define UNIX_CLI_DEFAULT_TERMINAL_WIDTH 80

/** A CLI banner line. */
typedef struct
{
  u8 *line;	/**< The line to print. */
  u32 length;	/**< The length of the line without terminating NUL. */
} unix_cli_banner_t;

#define _(a) { .line = (u8 *)(a), .length = sizeof(a) - 1 }
/** Plain welcome banner. */
static unix_cli_banner_t unix_cli_banner[] = {
  _("    _______    _        _   _____  ___ \n"),
  _(" __/ __/ _ \\  (_)__    | | / / _ \\/ _ \\\n"),
  _(" _/ _// // / / / _ \\   | |/ / ___/ ___/\n"),
  _(" /_/ /____(_)_/\\___/   |___/_/  /_/    \n"),
  _("\n")
};

/** ANSI color welcome banner. */
static unix_cli_banner_t unix_cli_banner_color[] = {
  _(ANSI_BRED "    _______    _     " ANSI_RESET "   _   _____  ___ \n"),
  _(ANSI_BRED " __/ __/ _ \\  (_)__ " ANSI_RESET "   | | / / _ \\/ _ \\\n"),
  _(ANSI_BRED " _/ _// // / / / _ \\" ANSI_RESET "   | |/ / ___/ ___/\n"),
  _(ANSI_BRED " /_/ /____(_)_/\\___/" ANSI_RESET "   |___/_/  /_/    \n"),
  _("\n")
};

#undef _

/** Pager line index */
typedef struct
{
  /** Index into pager_vector */
  u32 line;

  /** Offset of the string in the line */
  u32 offset;

  /** Length of the string in the line */
  u32 length;
} unix_cli_pager_index_t;


/** Unix CLI session. */
typedef struct
{
  /** The file index held by unix.c */
  u32 clib_file_index;

  /** Vector of output pending write to file descriptor. */
  u8 *output_vector;

  /** Vector of input saved by Unix input node to be processed by
     CLI process. */
  u8 *input_vector;

  /** This session has command history. */
  u8 has_history;
  /** Array of vectors of commands in the history. */
  u8 **command_history;
  /** The command currently pointed at by the history cursor. */
  u8 *current_command;
  /** How far from the end of the history array the user has browsed. */
  i32 excursion;

  /** Maximum number of history entries this session will store. */
  u32 history_limit;

  /** Current command line counter */
  u32 command_number;

  /** The string being searched for in the history. */
  u8 *search_key;
  /** If non-zero then the CLI is searching in the history array.
   * - @c -1 means search backwards.
   * - @c 1 means search forwards.
   */
  int search_mode;

  /** Position of the insert cursor on the current input line */
  u32 cursor;

  /** Line mode or char mode */
  u8 line_mode;

  /** Set if the CRLF mode wants CR + LF */
  u8 crlf_mode;

  /** Can we do ANSI output? */
  u8 ansi_capable;

  /** Has the session started? */
  u8 started;

  /** Disable the pager? */
  u8 no_pager;

  /** Whether the session is interactive or not.
   * Controls things like initial banner, the CLI prompt etc.  */
  u8 is_interactive;

  /** Whether the session is attached to a socket. */
  u8 is_socket;

  /** If EPIPE has been detected, prevent further write-related
   * activity on the descriptor.
   */
  u8 has_epipe;

  /** Pager buffer */
  u8 **pager_vector;

  /** Index of line fragments in the pager buffer */
  unix_cli_pager_index_t *pager_index;

  /** Line number of top of page */
  u32 pager_start;

  /** Terminal width */
  u32 width;

  /** Terminal height */
  u32 height;

  /** Process node identifier */
  u32 process_node_index;

  /** The current direction of cursor travel.
   *  This is important since when advancing left-to-right, at the
   *  right hand edge of the console the terminal typically defers
   *  wrapping the cursor to the next line until a character is
   *  actually displayed.
   *  This messes up our heuristic for whether to use ANSI to return
   *  the cursor to the end of the line and instead we have to
   *  nudge the cursor to the next line.
   *  A Value of @c 0 means we're advancing left-to-right; @c 1 means
   *  the opposite.
   */
  u8 cursor_direction;

} unix_cli_file_t;

/** Resets the pager buffer and other data.
 * @param f The CLI session whose pager needs to be reset.
 */
always_inline void
unix_cli_pager_reset (unix_cli_file_t * f)
{
  u8 **p;

  f->pager_start = 0;

  vec_free (f->pager_index);
  f->pager_index = 0;

  vec_foreach (p, f->pager_vector)
  {
    vec_free (*p);
  }
  vec_free (f->pager_vector);
  f->pager_vector = 0;
}

/** Release storage used by a CLI session.
 * @param f The CLI session whose storage needs to be released.
 */
always_inline void
unix_cli_file_free (unix_cli_file_t * f)
{
  vec_free (f->output_vector);
  vec_free (f->input_vector);
  unix_cli_pager_reset (f);
}

/** CLI actions */
typedef enum
{
  UNIX_CLI_PARSE_ACTION_NOACTION = 0,	/**< No action */
  UNIX_CLI_PARSE_ACTION_CRLF,		/**< Carriage return, newline or enter */
  UNIX_CLI_PARSE_ACTION_TAB,		/**< Tab key */
  UNIX_CLI_PARSE_ACTION_ERASE,		/**< Erase cursor left */
  UNIX_CLI_PARSE_ACTION_ERASERIGHT,	/**< Erase cursor right */
  UNIX_CLI_PARSE_ACTION_UP,		/**< Up arrow */
  UNIX_CLI_PARSE_ACTION_DOWN,		/**< Down arrow */
  UNIX_CLI_PARSE_ACTION_LEFT,		/**< Left arrow */
  UNIX_CLI_PARSE_ACTION_RIGHT,		/**< Right arrow */
  UNIX_CLI_PARSE_ACTION_HOME,		/**< Home key (jump to start of line) */
  UNIX_CLI_PARSE_ACTION_END,		/**< End key (jump to end of line) */
  UNIX_CLI_PARSE_ACTION_WORDLEFT,	/**< Jump cursor to start of left word */
  UNIX_CLI_PARSE_ACTION_WORDRIGHT,	/**< Jump cursor to start of right word */
  UNIX_CLI_PARSE_ACTION_ERASELINELEFT,	/**< Erase line to left of cursor */
  UNIX_CLI_PARSE_ACTION_ERASELINERIGHT,	/**< Erase line to right & including cursor */
  UNIX_CLI_PARSE_ACTION_ERASEWORDLEFT,	/**< Erase word left */
  UNIX_CLI_PARSE_ACTION_CLEAR,		/**< Clear the terminal */
  UNIX_CLI_PARSE_ACTION_REVSEARCH,	/**< Search backwards in command history */
  UNIX_CLI_PARSE_ACTION_FWDSEARCH,	/**< Search forwards in command history */
  UNIX_CLI_PARSE_ACTION_YANK,		/**< Undo last erase action */
  UNIX_CLI_PARSE_ACTION_TELNETIAC,	/**< Telnet control code */

  UNIX_CLI_PARSE_ACTION_PAGER_CRLF,	/**< Enter pressed (CR, CRLF, LF, etc) */
  UNIX_CLI_PARSE_ACTION_PAGER_QUIT,	/**< Exit the pager session */
  UNIX_CLI_PARSE_ACTION_PAGER_NEXT,	/**< Scroll to next page */
  UNIX_CLI_PARSE_ACTION_PAGER_DN,	/**< Scroll to next line */
  UNIX_CLI_PARSE_ACTION_PAGER_UP,	/**< Scroll to previous line */
  UNIX_CLI_PARSE_ACTION_PAGER_TOP,	/**< Scroll to first line */
  UNIX_CLI_PARSE_ACTION_PAGER_BOTTOM,	/**< Scroll to last line */
  UNIX_CLI_PARSE_ACTION_PAGER_PGDN,	/**< Scroll to next page */
  UNIX_CLI_PARSE_ACTION_PAGER_PGUP,	/**< Scroll to previous page */
  UNIX_CLI_PARSE_ACTION_PAGER_REDRAW,	/**< Clear and redraw the page on the terminal */
  UNIX_CLI_PARSE_ACTION_PAGER_SEARCH,	/**< Search the pager buffer */

  UNIX_CLI_PARSE_ACTION_PARTIALMATCH,	/**< Action parser found a partial match */
  UNIX_CLI_PARSE_ACTION_NOMATCH		/**< Action parser did not find any match */
} unix_cli_parse_action_t;

/** @brief Mapping of input buffer strings to action values.
 * @note This won't work as a hash since we need to be able to do
 *       partial matches on the string.
 */
typedef struct
{
  u8 *input;			    /**< Input string to match. */
  u32 len;			    /**< Length of input without final NUL. */
  unix_cli_parse_action_t action;   /**< Action to take when matched. */
} unix_cli_parse_actions_t;

/** @brief Given a capital ASCII letter character return a @c NUL terminated
 * string with the control code for that letter.
 *
 * @param c An ASCII character.
 * @return A @c NUL terminated string of type @c u8[].
 *
 * @par Example
 *     @c CTL('A') returns <code>{ 0x01, 0x00 }</code> as a @c u8[].
 */
#define CTL(c) (u8[]){ (c) - '@', 0 }

#define _(a,b) { .input = (u8 *)(a), .len = sizeof(a) - 1, .action = (b) }
/**
 * Patterns to match on a CLI input stream.
 * @showinitializer
 */
static unix_cli_parse_actions_t unix_cli_parse_strings[] = {
  /* Line handling */
  _("\r\n", UNIX_CLI_PARSE_ACTION_CRLF),	/* Must be before '\r' */
  _("\n", UNIX_CLI_PARSE_ACTION_CRLF),
  _("\r\0", UNIX_CLI_PARSE_ACTION_CRLF),	/* Telnet does this */
  _("\r", UNIX_CLI_PARSE_ACTION_CRLF),

  /* Unix shell control codes */
  _(CTL ('B'), UNIX_CLI_PARSE_ACTION_LEFT),
  _(CTL ('F'), UNIX_CLI_PARSE_ACTION_RIGHT),
  _(CTL ('P'), UNIX_CLI_PARSE_ACTION_UP),
  _(CTL ('N'), UNIX_CLI_PARSE_ACTION_DOWN),
  _(CTL ('A'), UNIX_CLI_PARSE_ACTION_HOME),
  _(CTL ('E'), UNIX_CLI_PARSE_ACTION_END),
  _(CTL ('D'), UNIX_CLI_PARSE_ACTION_ERASERIGHT),
  _(CTL ('U'), UNIX_CLI_PARSE_ACTION_ERASELINELEFT),
  _(CTL ('K'), UNIX_CLI_PARSE_ACTION_ERASELINERIGHT),
  _(CTL ('W'), UNIX_CLI_PARSE_ACTION_ERASEWORDLEFT),
  _(CTL ('Y'), UNIX_CLI_PARSE_ACTION_YANK),
  _(CTL ('L'), UNIX_CLI_PARSE_ACTION_CLEAR),
  _(ESC "b", UNIX_CLI_PARSE_ACTION_WORDLEFT),	/* Alt-B */
  _(ESC "f", UNIX_CLI_PARSE_ACTION_WORDRIGHT),	/* Alt-F */
  _("\b", UNIX_CLI_PARSE_ACTION_ERASE),	/* ^H */
  _("\x7f", UNIX_CLI_PARSE_ACTION_ERASE),	/* Backspace */
  _("\t", UNIX_CLI_PARSE_ACTION_TAB),	/* ^I */

  /* VT100 Normal mode - Broadest support */
  _(CSI "A", UNIX_CLI_PARSE_ACTION_UP),
  _(CSI "B", UNIX_CLI_PARSE_ACTION_DOWN),
  _(CSI "C", UNIX_CLI_PARSE_ACTION_RIGHT),
  _(CSI "D", UNIX_CLI_PARSE_ACTION_LEFT),
  _(CSI "H", UNIX_CLI_PARSE_ACTION_HOME),
  _(CSI "F", UNIX_CLI_PARSE_ACTION_END),
  _(CSI "3~", UNIX_CLI_PARSE_ACTION_ERASERIGHT),	/* Delete */
  _(CSI "1;5D", UNIX_CLI_PARSE_ACTION_WORDLEFT),	/* C-Left */
  _(CSI "1;5C", UNIX_CLI_PARSE_ACTION_WORDRIGHT),	/* C-Right */

  /* VT100 Application mode - Some Gnome Terminal functions use these */
  _(ESC "OA", UNIX_CLI_PARSE_ACTION_UP),
  _(ESC "OB", UNIX_CLI_PARSE_ACTION_DOWN),
  _(ESC "OC", UNIX_CLI_PARSE_ACTION_RIGHT),
  _(ESC "OD", UNIX_CLI_PARSE_ACTION_LEFT),
  _(ESC "OH", UNIX_CLI_PARSE_ACTION_HOME),
  _(ESC "OF", UNIX_CLI_PARSE_ACTION_END),

  /* ANSI X3.41-1974 - sent by Microsoft Telnet and PuTTY */
  _(CSI "1~", UNIX_CLI_PARSE_ACTION_HOME),
  _(CSI "4~", UNIX_CLI_PARSE_ACTION_END),

  /* Emacs-ish history search */
  _(CTL ('S'), UNIX_CLI_PARSE_ACTION_FWDSEARCH),
  _(CTL ('R'), UNIX_CLI_PARSE_ACTION_REVSEARCH),

  /* Other protocol things */
  _("\xff", UNIX_CLI_PARSE_ACTION_TELNETIAC),	/* IAC */
  _("\0", UNIX_CLI_PARSE_ACTION_NOACTION),	/* NUL */
  _(NULL, UNIX_CLI_PARSE_ACTION_NOMATCH)
};

/**
 * Patterns to match when a CLI session is in the pager.
 * @showinitializer
 */
static unix_cli_parse_actions_t unix_cli_parse_pager[] = {
  /* Line handling */
  _("\r\n", UNIX_CLI_PARSE_ACTION_PAGER_CRLF),	/* Must be before '\r' */
  _("\n", UNIX_CLI_PARSE_ACTION_PAGER_CRLF),
  _("\r\0", UNIX_CLI_PARSE_ACTION_PAGER_CRLF),	/* Telnet does this */
  _("\r", UNIX_CLI_PARSE_ACTION_PAGER_CRLF),

  /* Pager commands */
  _(" ", UNIX_CLI_PARSE_ACTION_PAGER_NEXT),
  _("q", UNIX_CLI_PARSE_ACTION_PAGER_QUIT),
  _(CTL ('L'), UNIX_CLI_PARSE_ACTION_PAGER_REDRAW),
  _(CTL ('R'), UNIX_CLI_PARSE_ACTION_PAGER_REDRAW),
  _("/", UNIX_CLI_PARSE_ACTION_PAGER_SEARCH),

  /* VT100 */
  _(CSI "A", UNIX_CLI_PARSE_ACTION_PAGER_UP),
  _(CSI "B", UNIX_CLI_PARSE_ACTION_PAGER_DN),
  _(CSI "H", UNIX_CLI_PARSE_ACTION_PAGER_TOP),
  _(CSI "F", UNIX_CLI_PARSE_ACTION_PAGER_BOTTOM),

  /* VT100 Application mode */
  _(ESC "OA", UNIX_CLI_PARSE_ACTION_PAGER_UP),
  _(ESC "OB", UNIX_CLI_PARSE_ACTION_PAGER_DN),
  _(ESC "OH", UNIX_CLI_PARSE_ACTION_PAGER_TOP),
  _(ESC "OF", UNIX_CLI_PARSE_ACTION_PAGER_BOTTOM),

  /* ANSI X3.41-1974 */
  _(CSI "1~", UNIX_CLI_PARSE_ACTION_PAGER_TOP),
  _(CSI "4~", UNIX_CLI_PARSE_ACTION_PAGER_BOTTOM),
  _(CSI "5~", UNIX_CLI_PARSE_ACTION_PAGER_PGUP),
  _(CSI "6~", UNIX_CLI_PARSE_ACTION_PAGER_PGDN),

  /* Other protocol things */
  _("\xff", UNIX_CLI_PARSE_ACTION_TELNETIAC),	/* IAC */
  _("\0", UNIX_CLI_PARSE_ACTION_NOACTION),	/* NUL */
  _(NULL, UNIX_CLI_PARSE_ACTION_NOMATCH)
};

#undef _

/** CLI session events. */
typedef enum
{
  UNIX_CLI_PROCESS_EVENT_READ_READY,  /**< A file descriptor has data to be read. */
  UNIX_CLI_PROCESS_EVENT_QUIT,	      /**< A CLI session wants to close. */
} unix_cli_process_event_type_t;

/** CLI session telnet negotiation timer events. */
typedef enum
{
  UNIX_CLI_NEW_SESSION_EVENT_ADD, /**< Add a CLI session to the new session list */
} unix_cli_timeout_event_type_t;

/** Each new session is stored on a list with a deadline after which
 * a prompt is issued, in case the session TELNET negotiation fails to
 * complete. */
typedef struct
{
  uword cf_index; /**< Session index of the new session. */
  f64 deadline;	  /**< Deadline after which the new session must have a prompt. */
} unix_cli_new_session_t;

/** CLI global state. */
typedef struct
{
  /** Prompt string for CLI. */
  u8 *cli_prompt;

  /** Vec pool of CLI sessions. */
  unix_cli_file_t *cli_file_pool;

  /** Vec pool of unused session indices. */
  u32 *unused_cli_process_node_indices;

  /** The session index of the stdin cli */
  u32 stdin_cli_file_index;

  /** File pool index of current input. */
  u32 current_input_file_index;

  /** New session process node identifier */
  u32 new_session_process_node_index;

  /** List of new sessions */
  unix_cli_new_session_t *new_sessions;
} unix_cli_main_t;

/** CLI global state */
static unix_cli_main_t unix_cli_main;

/**
 * @brief Search for a byte sequence in the action list.
 *
 * Searches the @ref unix_cli_parse_actions_t list in @a a for a match with
 * the bytes in @a input of maximum length @a ilen bytes.
 * When a match is made @a *matched indicates how many bytes were matched.
 * Returns a value from the enum @ref unix_cli_parse_action_t to indicate
 * whether no match was found, a partial match was found or a complete
 * match was found and what action, if any, should be taken.
 *
 * @param[in]  a        Actions list to search within.
 * @param[in]  input    String fragment to search for.
 * @param[in]  ilen     Length of the string in 'input'.
 * @param[out] matched  Pointer to an integer that will contain the number
 *                      of bytes matched when a complete match is found.
 *
 * @return Action from @ref unix_cli_parse_action_t that the string fragment
 *         matches.
 *         @ref UNIX_CLI_PARSE_ACTION_PARTIALMATCH is returned when the
 *         whole input string matches the start of at least one action.
 *         @ref UNIX_CLI_PARSE_ACTION_NOMATCH is returned when there is no
 *         match at all.
 */
static unix_cli_parse_action_t
unix_cli_match_action (unix_cli_parse_actions_t * a,
		       u8 * input, u32 ilen, i32 * matched)
{
  u8 partial = 0;

  while (a->input)
    {
      if (ilen >= a->len)
	{
	  /* see if the start of the input buffer exactly matches the current
	   * action string. */
	  if (memcmp (input, a->input, a->len) == 0)
	    {
	      *matched = a->len;
	      return a->action;
	    }
	}
      else
	{
	  /* if the first ilen characters match, flag this as a partial -
	   * meaning keep collecting bytes in case of a future match */
	  if (memcmp (input, a->input, ilen) == 0)
	    partial = 1;
	}

      /* check next action */
      a++;
    }

  return partial ?
    UNIX_CLI_PARSE_ACTION_PARTIALMATCH : UNIX_CLI_PARSE_ACTION_NOMATCH;
}


/** Add bytes to the output vector and then flagg the I/O system that bytes
 * are available to be sent.
 */
static void
unix_cli_add_pending_output (clib_file_t * uf,
			     unix_cli_file_t * cf,
			     u8 * buffer, uword buffer_bytes)
{
  clib_file_main_t *fm = &file_main;

  vec_add (cf->output_vector, buffer, buffer_bytes);
  if (vec_len (cf->output_vector) > 0)
    {
      int skip_update = 0 != (uf->flags & UNIX_FILE_DATA_AVAILABLE_TO_WRITE);
      uf->flags |= UNIX_FILE_DATA_AVAILABLE_TO_WRITE;
      if (!skip_update)
	fm->file_update (uf, UNIX_FILE_UPDATE_MODIFY);
    }
}

/** Delete all bytes from the output vector and flag the I/O system
 * that no more bytes are available to be sent.
 */
static void
unix_cli_del_pending_output (clib_file_t * uf,
			     unix_cli_file_t * cf, uword n_bytes)
{
  clib_file_main_t *fm = &file_main;

  vec_delete (cf->output_vector, n_bytes, 0);
  if (vec_len (cf->output_vector) <= 0)
    {
      int skip_update = 0 == (uf->flags & UNIX_FILE_DATA_AVAILABLE_TO_WRITE);
      uf->flags &= ~UNIX_FILE_DATA_AVAILABLE_TO_WRITE;
      if (!skip_update)
	fm->file_update (uf, UNIX_FILE_UPDATE_MODIFY);
    }
}

/** @brief A bit like strchr with a buffer length limit.
 * Search a buffer for the first instance of a character up to the limit of
 * the buffer length. If found then return the position of that character.
 *
 * The key departure from strchr is that if the character is not found then
 * return the buffer length.
 *
 * @param chr The byte value to search for.
 * @param str The buffer in which to search for the value.
 * @param len The depth into the buffer to search.
 *
 * @return The index of the first occurrence of \c chr. If \c chr is not
 *          found then \c len instead.
 */
always_inline word
unix_vlib_findchr (u8 chr, u8 * str, word len)
{
  word i = 0;
  for (i = 0; i < len; i++, str++)
    {
      if (*str == chr)
	return i;
    }
  return len;
}

/** @brief Send a buffer to the CLI stream if possible, enqueue it otherwise.
 * Attempts to write given buffer to the file descriptor of the given
 * Unix CLI session. If that session already has data in the output buffer
 * or if the write attempt tells us to try again later then the given buffer
 * is appended to the pending output buffer instead.
 *
 * This is typically called only from \c unix_vlib_cli_output_cooked since
 * that is where CRLF handling occurs or from places where we explicitly do
 * not want cooked handling.
 *
 * @param cf Unix CLI session of the desired stream to write to.
 * @param uf The Unix file structure of the desired stream to write to.
 * @param buffer Pointer to the buffer that needs to be written.
 * @param buffer_bytes The number of bytes from \c buffer to write.
 */
static void
unix_vlib_cli_output_raw (unix_cli_file_t * cf,
			  clib_file_t * uf, u8 * buffer, uword buffer_bytes)
{
  int n = 0;

  if (cf->has_epipe)		/* don't try writing anything */
    return;

  if (vec_len (cf->output_vector) == 0)
    {
      if (cf->is_socket)
	/* If it's a socket we use MSG_NOSIGNAL to prevent SIGPIPE */
	n = send (uf->file_descriptor, buffer, buffer_bytes, MSG_NOSIGNAL);
      else
	n = write (uf->file_descriptor, buffer, buffer_bytes);
    }

  if (n < 0 && errno != EAGAIN)
    {
      if (errno == EPIPE)
	{
	  /* connection closed on us */
	  unix_main_t *um = &unix_main;
	  cf->has_epipe = 1;
	  vlib_process_signal_event (um->vlib_main, cf->process_node_index,
				     UNIX_CLI_PROCESS_EVENT_QUIT,
				     uf->private_data);
	}
      else
	{
	  clib_unix_warning ("write");
	}
    }
  else if ((word) n < (word) buffer_bytes)
    {
      /* We got EAGAIN or we already have stuff in the buffer;
       * queue up whatever didn't get sent for later. */
      if (n < 0)
	n = 0;
      unix_cli_add_pending_output (uf, cf, buffer + n, buffer_bytes - n);
    }
}

/** @brief Process a buffer for CRLF handling before outputting it to the CLI.
 *
 * @param cf Unix CLI session of the desired stream to write to.
 * @param uf The Unix file structure of the desired stream to write to.
 * @param buffer Pointer to the buffer that needs to be written.
 * @param buffer_bytes The number of bytes from \c buffer to write.
 */
static void
unix_vlib_cli_output_cooked (unix_cli_file_t * cf,
			     clib_file_t * uf,
			     u8 * buffer, uword buffer_bytes)
{
  word end = 0, start = 0;

  while (end < buffer_bytes)
    {
      if (cf->crlf_mode)
	{
	  /* iterate the line on \n's so we can insert a \r before it */
	  end = unix_vlib_findchr ('\n',
				   buffer + start,
				   buffer_bytes - start) + start;
	}
      else
	{
	  /* otherwise just send the whole buffer */
	  end = buffer_bytes;
	}

      unix_vlib_cli_output_raw (cf, uf, buffer + start, end - start);

      if (cf->crlf_mode)
	{
	  if (end < buffer_bytes)
	    {
	      unix_vlib_cli_output_raw (cf, uf, (u8 *) "\r\n", 2);
	      end++;		/* skip the \n that we already sent */
	    }
	  start = end;
	}
    }

  /* Use the last character to determine the last direction of the cursor. */
  if (buffer_bytes > 0)
    cf->cursor_direction = (buffer[buffer_bytes - 1] == (u8) '\b');
}

/** @brief Moves the terminal cursor one character to the left, with
 * special handling when it reaches the left edge of the terminal window.
 *
 * Ordinarily we can simply send a '\b' to move the cursor left, however
 * most terminals will not reverse-wrap to the end of the previous line
 * if the cursor is in the left-most column. To counter this we must
 * check the cursor position + prompt length modulo terminal width and
 * if available use some other means, such as ANSI terminal escape
 * sequences, to move the cursor.
 *
 * @param cf Unix CLI session of the desired stream to write to.
 * @param uf The Unix file structure of the desired stream to write to.
 */
static void
unix_vlib_cli_output_cursor_left (unix_cli_file_t * cf, clib_file_t * uf)
{
  unix_cli_main_t *cm = &unix_cli_main;
  static u8 *ansi = 0;		/* assumes no reentry */
  u32 position;

  if (!cf->is_interactive || !cf->ansi_capable || !cf->width)
    {
      /* No special handling for dumb terminals */
      unix_vlib_cli_output_cooked (cf, uf, (u8 *) "\b", 1);
      return;
    }

  position = ((u32) vec_len (cm->cli_prompt) + cf->cursor) % cf->width;

  if (position != 0)
    {
      /* No special handling required if we're not at the left edge */
      unix_vlib_cli_output_cooked (cf, uf, (u8 *) "\b", 1);
      return;
    }

  if (!cf->cursor_direction)
    {
      /* Special handling for when we are at the left edge but
       * the cursor was going left-to-right, but in this situation
       * xterm-like terminals actually hide the cursor off the right
       * edge. A \b here seems to jump one char too many, so let's
       * force the cursor onto the next line instead.
       */
      if (cf->cursor < vec_len (cf->current_command))
	unix_vlib_cli_output_cooked (cf, uf, &cf->current_command[cf->cursor],
				     1);
      else
	unix_vlib_cli_output_cooked (cf, uf, (u8 *) " ", 1);
      unix_vlib_cli_output_cooked (cf, uf, (u8 *) "\r", 1);
    }

  /* Relocate the cursor at the right hand edge one line above */
  ansi = format (ansi, CSI "A" CSI "%dC", cf->width - 1);
  unix_vlib_cli_output_cooked (cf, uf, ansi, vec_len (ansi));
  vec_reset_length (ansi);	/* keep the vec around for next time */
  cf->cursor_direction = 1;	/* going backwards now */
}

/** @brief Output the CLI prompt */
static void
unix_cli_cli_prompt (unix_cli_file_t * cf, clib_file_t * uf)
{
  unix_cli_main_t *cm = &unix_cli_main;

  if (cf->is_interactive)	/* Only interactive sessions get a prompt */
    unix_vlib_cli_output_raw (cf, uf, cm->cli_prompt,
			      vec_len (cm->cli_prompt));
}

/** @brief Output a pager prompt and show number of buffered lines */
static void
unix_cli_pager_prompt (unix_cli_file_t * cf, clib_file_t * uf)
{
  u8 *prompt;
  u32 h;

  h = cf->pager_start + (cf->height - 1);
  if (h > vec_len (cf->pager_index))
    h = vec_len (cf->pager_index);

  prompt = format (0, "\r%s-- more -- (%d-%d/%d)%s",
		   cf->ansi_capable ? ANSI_BOLD : "",
		   cf->pager_start + 1,
		   h,
		   vec_len (cf->pager_index),
		   cf->ansi_capable ? ANSI_RESET : "");

  unix_vlib_cli_output_cooked (cf, uf, prompt, vec_len (prompt));

  vec_free (prompt);
}

/** @brief Output a pager "skipping" message */
static void
unix_cli_pager_message (unix_cli_file_t * cf, clib_file_t * uf,
			char *message, char *postfix)
{
  u8 *prompt;

  prompt = format (0, "\r%s-- %s --%s%s",
		   cf->ansi_capable ? ANSI_BOLD : "",
		   message, cf->ansi_capable ? ANSI_RESET : "", postfix);

  unix_vlib_cli_output_cooked (cf, uf, prompt, vec_len (prompt));

  vec_free (prompt);
}

/** @brief Erase the printed pager prompt */
static void
unix_cli_pager_prompt_erase (unix_cli_file_t * cf, clib_file_t * uf)
{
  if (cf->ansi_capable)
    {
      unix_vlib_cli_output_cooked (cf, uf, (u8 *) "\r", 1);
      unix_vlib_cli_output_cooked (cf, uf,
				   (u8 *) ANSI_CLEARLINE,
				   sizeof (ANSI_CLEARLINE) - 1);
    }
  else
    {
      int i;

      unix_vlib_cli_output_cooked (cf, uf, (u8 *) "\r", 1);
      for (i = 0; i < cf->width - 1; i++)
	unix_vlib_cli_output_cooked (cf, uf, (u8 *) " ", 1);
      unix_vlib_cli_output_cooked (cf, uf, (u8 *) "\r", 1);
    }
}

/** @brief Uses an ANSI escape sequence to move the cursor */
static void
unix_cli_ansi_cursor (unix_cli_file_t * cf, clib_file_t * uf, u16 x, u16 y)
{
  u8 *str;

  str = format (0, "%s%d;%dH", CSI, y, x);

  unix_vlib_cli_output_cooked (cf, uf, str, vec_len (str));

  vec_free (str);
}

/** Redraw the currently displayed page of text.
 * @param cf CLI session to redraw the pager buffer of.
 * @param uf Unix file of the CLI session.
 */
static void
unix_cli_pager_redraw (unix_cli_file_t * cf, clib_file_t * uf)
{
  unix_cli_pager_index_t *pi = NULL;
  u8 *line = NULL;
  word i;

  /* No active pager? Do nothing. */
  if (!vec_len (cf->pager_index))
    return;

  if (cf->ansi_capable)
    {
      /* If we have ANSI, send the clear screen sequence */
      unix_vlib_cli_output_cooked (cf, uf,
				   (u8 *) ANSI_CLEAR,
				   sizeof (ANSI_CLEAR) - 1);
    }
  else
    {
      /* Otherwise make sure we're on a blank line */
      unix_cli_pager_prompt_erase (cf, uf);
    }

  /* (Re-)send the current page of content */
  for (i = 0; i < cf->height - 1 &&
       i + cf->pager_start < vec_len (cf->pager_index); i++)
    {
      pi = &cf->pager_index[cf->pager_start + i];
      line = cf->pager_vector[pi->line] + pi->offset;

      unix_vlib_cli_output_cooked (cf, uf, line, pi->length);
    }
  /* if the last line didn't end in newline, add a newline */
  if (pi && line[pi->length - 1] != '\n')
    unix_vlib_cli_output_cooked (cf, uf, (u8 *) "\n", 1);

  unix_cli_pager_prompt (cf, uf);
}

/** @brief Process and add a line to the pager index.
 * In normal operation this function will take the given character string
 * found in @c line and with length @c len_or_index and iterates the over the
 * contents, adding each line of text discovered within it to the
 * pager index. Lines are identified by newlines ("<code>\\n</code>") and by
 * strings longer than the width of the terminal.
 *
 * If instead @c line is @c NULL then @c len_or_index is taken to mean the
 * index of an existing line in the pager buffer; this simply means that the
 * input line does not need to be cloned since we already have it. This is
 * typical if we are reindexing the pager buffer.
 *
 * @param cf           The CLI session whose pager we are adding to.
 * @param line         The string of text to be indexed into the pager buffer.
 *                     If @c line is @c NULL then the mode of operation
 *                     changes slightly; see the description above.
 * @param len_or_index If @c line is a pointer to a string then this parameter
 *                     indicates the length of that string; Otherwise this
 *                     value provides the index in the pager buffer of an
 *                     existing string to be indexed.
 */
static void
unix_cli_pager_add_line (unix_cli_file_t * cf, u8 * line, word len_or_index)
{
  u8 *p = NULL;
  word i, j, k;
  word line_index, len;
  u32 width = cf->width;
  unix_cli_pager_index_t *pi;

  if (line == NULL)
    {
      /* Use a line already in the pager buffer */
      line_index = len_or_index;
      if (cf->pager_vector != NULL)
	p = cf->pager_vector[line_index];
      len = vec_len (p);
    }
  else
    {
      len = len_or_index;
      /* Add a copy of the raw string to the pager buffer */
      p = vec_new (u8, len);
      clib_memcpy (p, line, len);

      /* store in pager buffer */
      line_index = vec_len (cf->pager_vector);
      vec_add1 (cf->pager_vector, p);
    }

  i = 0;
  while (i < len)
    {
      /* Find the next line, or run to terminal width, or run to EOL */
      int l = len - i;
      j = unix_vlib_findchr ((u8) '\n', p, l < width ? l : width);

      if (j < l && p[j] == '\n')	/* incl \n */
	j++;

      /* Add the line to the index */
      k = vec_len (cf->pager_index);
      vec_validate (cf->pager_index, k);
      pi = &cf->pager_index[k];

      pi->line = line_index;
      pi->offset = i;
      pi->length = j;

      i += j;
      p += j;
    }
}

/** @brief Reindex entire pager buffer.
 * Resets the current pager index and then re-adds the lines in the pager
 * buffer to the index.
 *
 * Additionally this function attempts to retain the current page start
 * line offset by searching for the same top-of-screen line in the new index.
 *
 * @param cf The CLI session whose pager buffer should be reindexed.
 */
static void
unix_cli_pager_reindex (unix_cli_file_t * cf)
{
  word i, old_line, old_offset;
  unix_cli_pager_index_t *pi;

  /* If there is nothing in the pager buffer then make sure the index
   * is empty and move on.
   */
  if (cf->pager_vector == 0)
    {
      vec_reset_length (cf->pager_index);
      return;
    }

  /* Retain a pointer to the current page start line so we can
   * find it later
   */
  pi = &cf->pager_index[cf->pager_start];
  old_line = pi->line;
  old_offset = pi->offset;

  /* Re-add the buffered lines to the index */
  vec_reset_length (cf->pager_index);
  vec_foreach_index (i, cf->pager_vector)
  {
    unix_cli_pager_add_line (cf, NULL, i);
  }

  /* Attempt to re-locate the previously stored page start line */
  vec_foreach_index (i, cf->pager_index)
  {
    pi = &cf->pager_index[i];

    if (pi->line == old_line &&
	(pi->offset <= old_offset || pi->offset + pi->length > old_offset))
      {
	/* Found it! */
	cf->pager_start = i;
	break;
      }
  }

  /* In case the start line was not found (rare), ensure the pager start
   * index is within bounds
   */
  if (cf->pager_start >= vec_len (cf->pager_index))
    {
      if (!cf->height || vec_len (cf->pager_index) < (cf->height - 1))
	cf->pager_start = 0;
      else
	cf->pager_start = vec_len (cf->pager_index) - (cf->height - 1);
    }
}

/** VLIB CLI output function.
 *
 * If the terminal has a pager configured then this function takes care
 * of collating output into the pager buffer; ensuring only the first page
 * is displayed and any lines in excess of the first page are buffered.
 *
 * If the maximum number of index lines in the buffer is exceeded then the
 * pager is cancelled and the contents of the current buffer are sent to the
 * terminal.
 *
 * If there is no pager configured then the output is sent directly to the
 * terminal.
 *
 * @param cli_file_index Index of the CLI session where this output is
 *                       directed.
 * @param buffer         String of printabe bytes to be output.
 * @param buffer_bytes   The number of bytes in @c buffer to be output.
 */
static void
unix_vlib_cli_output (uword cli_file_index, u8 * buffer, uword buffer_bytes)
{
  unix_main_t *um = &unix_main;
  clib_file_main_t *fm = &file_main;
  unix_cli_main_t *cm = &unix_cli_main;
  unix_cli_file_t *cf;
  clib_file_t *uf;

  cf = pool_elt_at_index (cm->cli_file_pool, cli_file_index);
  uf = pool_elt_at_index (fm->file_pool, cf->clib_file_index);

  if (cf->no_pager || um->cli_pager_buffer_limit == 0 || cf->height == 0)
    {
      unix_vlib_cli_output_cooked (cf, uf, buffer, buffer_bytes);
    }
  else
    {
      word row = vec_len (cf->pager_index);
      u8 *line;
      unix_cli_pager_index_t *pi;

      /* Index and add the output lines to the pager buffer. */
      unix_cli_pager_add_line (cf, buffer, buffer_bytes);

      /* Now iterate what was added to display the lines.
       * If we reach the bottom of the page, display a prompt.
       */
      while (row < vec_len (cf->pager_index))
	{
	  if (row < cf->height - 1)
	    {
	      /* output this line */
	      pi = &cf->pager_index[row];
	      line = cf->pager_vector[pi->line] + pi->offset;
	      unix_vlib_cli_output_cooked (cf, uf, line, pi->length);

	      /* if the last line didn't end in newline, and we're at the
	       * bottom of the page, add a newline */
	      if (line[pi->length - 1] != '\n' && row == cf->height - 2)
		unix_vlib_cli_output_cooked (cf, uf, (u8 *) "\n", 1);
	    }
	  else
	    {
	      /* Display the pager prompt every 10 lines */
	      if (!(row % 10))
		unix_cli_pager_prompt (cf, uf);
	    }
	  row++;
	}

      /* Check if we went over the pager buffer limit */
      if (vec_len (cf->pager_index) > um->cli_pager_buffer_limit)
	{
	  /* Stop using the pager for the remainder of this CLI command */
	  cf->no_pager = 2;

	  /* If we likely printed the prompt, erase it */
	  if (vec_len (cf->pager_index) > cf->height - 1)
	    unix_cli_pager_prompt_erase (cf, uf);

	  /* Dump out the contents of the buffer */
	  for (row = cf->pager_start + (cf->height - 1);
	       row < vec_len (cf->pager_index); row++)
	    {
	      pi = &cf->pager_index[row];
	      line = cf->pager_vector[pi->line] + pi->offset;
	      unix_vlib_cli_output_cooked (cf, uf, line, pi->length);
	    }

	  unix_cli_pager_reset (cf);
	}
    }
}

/** Identify whether a terminal type is ANSI capable.
 *
 * Compares the string given in @c term with a list of terminal types known
 * to support ANSI escape sequences.
 *
 * This list contains, for example, @c xterm, @c screen and @c ansi.
 *
 * @param term A string with a terminal type in it.
 * @param len The length of the string in @c term.
 *
 * @return @c 1 if the terminal type is recognized as supporting ANSI
 *         terminal sequences; @c 0 otherwise.
 */
static u8
unix_cli_terminal_type_ansi (u8 * term, uword len)
{
  /* This may later be better done as a hash of some sort. */
#define _(a) do { \
    if (strncasecmp(a, (char *)term, (size_t)len) == 0) return 1; \
  } while(0)

  _("xterm");
  _("xterm-color");
  _("xterm-256color");		/* iTerm on Mac */
  _("screen");
  _("screen-256color");		/* Screen and tmux */
  _("ansi");			/* Microsoft Telnet */
#undef _

  return 0;
}

/** Identify whether a terminal type is non-interactive.
 *
 * Compares the string given in @c term with a list of terminal types known
 * to be non-interactive, as send by tools such as @c vppctl .
 *
 * This list contains, for example, @c vppctl.
 *
 * @param term A string with a terminal type in it.
 * @param len The length of the string in @c term.
 *
 * @return @c 1 if the terminal type is recognized as being non-interactive;
 *         @c 0 otherwise.
 */
static u8
unix_cli_terminal_type_noninteractive (u8 * term, uword len)
{
  /* This may later be better done as a hash of some sort. */
#define _(a) do { \
    if (strncasecmp(a, (char *)term, (size_t)len) == 0) return 1; \
  } while(0)

  _("vppctl");
#undef _

  return 0;
}

/** Set a session to be non-interactive. */
static void
unix_cli_set_session_noninteractive (unix_cli_file_t * cf)
{
  /* Non-interactive sessions don't get these */
  cf->is_interactive = 0;
  cf->no_pager = 1;
  cf->history_limit = 0;
  cf->has_history = 0;
  cf->line_mode = 1;
}

/** @brief Emit initial welcome banner and prompt on a connection. */
static void
unix_cli_file_welcome (unix_cli_main_t * cm, unix_cli_file_t * cf)
{
  unix_main_t *um = &unix_main;
  clib_file_main_t *fm = &file_main;
  clib_file_t *uf = pool_elt_at_index (fm->file_pool, cf->clib_file_index);
  unix_cli_banner_t *banner;
  int i, len;

  /* Mark the session as started if we get here */
  cf->started = 1;

  if (!(cf->is_interactive))	/* No banner for non-interactive sessions */
    return;

  /*
   * Put the first bytes directly into the buffer so that further output is
   * queued until everything is ready. (oterwise initial prompt can appear
   * mid way through VPP initialization)
   */
  unix_cli_add_pending_output (uf, cf, (u8 *) "\r", 1);

  if (!um->cli_no_banner)
    {
      if (cf->ansi_capable)
	{
	  banner = unix_cli_banner_color;
	  len = ARRAY_LEN (unix_cli_banner_color);
	}
      else
	{
	  banner = unix_cli_banner;
	  len = ARRAY_LEN (unix_cli_banner);
	}

      for (i = 0; i < len; i++)
	{
	  unix_vlib_cli_output_cooked (cf, uf,
				       banner[i].line, banner[i].length);
	}
    }

  /* Prompt. */
  unix_cli_cli_prompt (cf, uf);

}

/**
 * @brief A failsafe manager that ensures CLI sessions issue an initial
 * prompt if TELNET negotiation fails.
 */
static uword
unix_cli_new_session_process (vlib_main_t * vm, vlib_node_runtime_t * rt,
			      vlib_frame_t * f)
{
  unix_cli_main_t *cm = &unix_cli_main;
  uword event_type, *event_data = 0;
  f64 wait = 10.0;

  while (1)
    {
      if (vec_len (cm->new_sessions) > 0)
	wait = vlib_process_wait_for_event_or_clock (vm, wait);
      else
	vlib_process_wait_for_event (vm);

      event_type = vlib_process_get_events (vm, &event_data);

      switch (event_type)
	{
	case ~0:		/* no events => timeout */
	  break;

	case UNIX_CLI_NEW_SESSION_EVENT_ADD:
	  {
	    /* Add an identifier to the new session list */
	    unix_cli_new_session_t ns;

	    ns.cf_index = event_data[0];
	    ns.deadline = vlib_time_now (vm) + 1.0;

	    vec_add1 (cm->new_sessions, ns);

	    if (wait > 0.1)
	      wait = 0.1;	/* force a re-evaluation soon, but not too soon */
	  }
	  break;

	default:
	  clib_warning ("BUG: unknown event type 0x%wx", event_type);
	  break;
	}

      vec_reset_length (event_data);

      if (vlib_process_suspend_time_is_zero (wait))
	{
	  /* Scan the list looking for expired deadlines.
	   * Emit needed prompts and remove from the list.
	   * While scanning, look for the nearest new deadline
	   * for the next iteration.
	   * Since the list is ordered with newest sessions first
	   * we can make assumptions about expired sessions being
	   * contiguous at the beginning and the next deadline is the
	   * next entry on the list, if any.
	   */
	  f64 now = vlib_time_now (vm);
	  unix_cli_new_session_t *nsp;
	  word index = 0;

	  wait = INFINITY;

	  vec_foreach (nsp, cm->new_sessions)
	  {
	    if (vlib_process_suspend_time_is_zero (nsp->deadline - now))
	      {
		/* Deadline reached */
		unix_cli_file_t *cf;

		/* Mark the highwater */
		index++;

		/* Check the connection didn't close already */
		if (pool_is_free_index (cm->cli_file_pool, nsp->cf_index))
		  continue;

		cf = pool_elt_at_index (cm->cli_file_pool, nsp->cf_index);

		if (!cf->started)
		  unix_cli_file_welcome (cm, cf);
	      }
	    else
	      {
		wait = nsp->deadline - now;
		break;
	      }
	  }

	  if (index)
	    {
	      /* We have sessions to remove */
	      vec_delete (cm->new_sessions, index, 0);
	    }
	}
    }

  return 0;
}


/** @brief A mostly no-op Telnet state machine.
 * Process Telnet command bytes in a way that ensures we're mostly
 * transparent to the Telnet protocol. That is, it's mostly a no-op.
 *
 * @return -1 if we need more bytes, otherwise a positive integer number of
 *          bytes to consume from the input_vector, not including the initial
 *          IAC byte.
 */
static i32
unix_cli_process_telnet (unix_main_t * um,
			 unix_cli_file_t * cf,
			 clib_file_t * uf, u8 * input_vector, uword len)
{
  /* Input_vector starts at IAC byte.
   * See if we have a complete message; if not, return -1 so we wait for more.
   * if we have a complete message, consume those bytes from the vector.
   */
  i32 consume = 0;

  if (len == 1)
    return -1;			/* want more bytes */

  switch (input_vector[1])
    {
    case IAC:
      /* two IAC's in a row means to pass through 0xff.
       * since that makes no sense here, just consume it.
       */
      consume = 1;
      break;

    case WILL:
    case WONT:
    case DO:
    case DONT:
      /* Expect 3 bytes */
      if (len < 3)
	return -1;		/* want more bytes */

      consume = 2;
      break;

    case SB:
      {
	/* Sub option - search ahead for IAC SE to end it */
	i32 i;
	for (i = 3; i < len && i < UNIX_CLI_MAX_DEPTH_TELNET; i++)
	  {
	    if (input_vector[i - 1] == IAC && input_vector[i] == SE)
	      {
		/* We have a complete message; see if we care about it */
		switch (input_vector[2])
		  {
		  case TELOPT_TTYPE:
		    if (input_vector[3] != 0)
		      break;
		    {
		      /* See if the the terminal type is recognized */
		      u8 *term = input_vector + 4;
		      uword len = i - 5;

		      /* See if the terminal type is ANSI capable */
		      cf->ansi_capable =
			unix_cli_terminal_type_ansi (term, len);

		      /* See if the terminal type indicates non-interactive */
		      if (unix_cli_terminal_type_noninteractive (term, len))
			unix_cli_set_session_noninteractive (cf);
		    }

		    /* If session not started, we can release the pause */
		    if (!cf->started)
		      /* Send the welcome banner and initial prompt */
		      unix_cli_file_welcome (&unix_cli_main, cf);
		    break;

		  case TELOPT_NAWS:
		    /* Window size */
		    if (i != 8)	/* check message is correct size */
		      break;

		    cf->width =
		      clib_net_to_host_u16 (*((u16 *) (input_vector + 3)));
		    if (cf->width > UNIX_CLI_MAX_TERMINAL_WIDTH)
		      cf->width = UNIX_CLI_MAX_TERMINAL_WIDTH;
		    if (cf->width == 0)
		      cf->width = UNIX_CLI_DEFAULT_TERMINAL_WIDTH;

		    cf->height =
		      clib_net_to_host_u16 (*((u16 *) (input_vector + 5)));
		    if (cf->height > UNIX_CLI_MAX_TERMINAL_HEIGHT)
		      cf->height = UNIX_CLI_MAX_TERMINAL_HEIGHT;
		    if (cf->height == 0)
		      cf->height = UNIX_CLI_DEFAULT_TERMINAL_HEIGHT;

		    /* reindex pager buffer */
		    unix_cli_pager_reindex (cf);
		    /* redraw page */
		    unix_cli_pager_redraw (cf, uf);
		    break;

		  default:
		    break;
		  }
		/* Consume it all */
		consume = i;
		break;
	      }
	  }

	if (i == UNIX_CLI_MAX_DEPTH_TELNET)
	  consume = 1;		/* hit max search depth, advance one byte */

	if (consume == 0)
	  return -1;		/* want more bytes */

	break;
      }

    case GA:
    case EL:
    case EC:
    case AO:
    case IP:
    case BREAK:
    case DM:
    case NOP:
    case SE:
    case EOR:
    case ABORT:
    case SUSP:
    case xEOF:
      /* Simple one-byte messages */
      consume = 1;
      break;

    case AYT:
      /* Are You There - trigger a visible response */
      consume = 1;
      unix_vlib_cli_output_cooked (cf, uf, (u8 *) "fd.io VPP\n", 10);
      break;

    default:
      /* Unknown command! Eat the IAC byte */
      break;
    }

  return consume;
}

/** @brief Process actionable input.
 * Based on the \c action process the input; this typically involves
 * searching the command history or editing the current command line.
 */
static int
unix_cli_line_process_one (unix_cli_main_t * cm,
			   unix_main_t * um,
			   unix_cli_file_t * cf,
			   clib_file_t * uf,
			   u8 input, unix_cli_parse_action_t action)
{
  u8 *prev;
  u8 *save = 0;
  u8 **possible_commands;
  int j, delta;

  switch (action)
    {
    case UNIX_CLI_PARSE_ACTION_NOACTION:
      break;

    case UNIX_CLI_PARSE_ACTION_REVSEARCH:
    case UNIX_CLI_PARSE_ACTION_FWDSEARCH:
      if (!cf->has_history || !cf->history_limit)
	break;
      if (cf->search_mode == 0)
	{
	  /* Erase the current command (if any) */
	  for (; cf->cursor > 0; cf->cursor--)
	    {
	      unix_vlib_cli_output_cursor_left (cf, uf);
	      unix_vlib_cli_output_cooked (cf, uf, (u8 *) " ", 1);
	      unix_vlib_cli_output_cursor_left (cf, uf);
	    }

	  vec_reset_length (cf->search_key);
	  vec_reset_length (cf->current_command);

	  if (action == UNIX_CLI_PARSE_ACTION_REVSEARCH)
	    cf->search_mode = -1;
	  else
	    cf->search_mode = 1;
	}
      else
	{
	  if (action == UNIX_CLI_PARSE_ACTION_REVSEARCH)
	    cf->search_mode = -1;
	  else
	    cf->search_mode = 1;

	  cf->excursion += cf->search_mode;
	  goto search_again;
	}
      break;

    case UNIX_CLI_PARSE_ACTION_ERASELINELEFT:
      /* Erase the command from the cursor to the start */

      j = cf->cursor;
      /* Shimmy backwards to the new end of line position */
      delta = vec_len (cf->current_command) - cf->cursor;
      for (; cf->cursor > delta; cf->cursor--)
	unix_vlib_cli_output_cursor_left (cf, uf);
      /* Zap from here to the end of what is currently displayed */
      for (; cf->cursor < vec_len (cf->current_command); cf->cursor++)
	unix_vlib_cli_output_cooked (cf, uf, (u8 *) " ", 1);
      /* Get back to the start of the line */
      for (; cf->cursor > 0; cf->cursor--)
	unix_vlib_cli_output_cursor_left (cf, uf);

      /* Delete the desired text from the command */
      memmove (cf->current_command, cf->current_command + j, delta);
      _vec_len (cf->current_command) = delta;

      /* Print the new contents */
      unix_vlib_cli_output_cooked (cf, uf, cf->current_command, delta);
      cf->cursor = delta;	/* for backspace tracking */

      /* Shimmy back to the start */
      for (; cf->cursor > 0; cf->cursor--)
	unix_vlib_cli_output_cursor_left (cf, uf);

      cf->search_mode = 0;
      break;

    case UNIX_CLI_PARSE_ACTION_ERASELINERIGHT:
      /* Erase the command from the cursor to the end */

      j = cf->cursor;
      /* Zap from cursor to end of what is currently displayed */
      for (; cf->cursor < (vec_len (cf->current_command)); cf->cursor++)
	unix_vlib_cli_output_cooked (cf, uf, (u8 *) " ", 1);
      /* Get back to where we were */
      for (; cf->cursor > j; cf->cursor--)
	unix_vlib_cli_output_cursor_left (cf, uf);

      /* Truncate the line at the cursor */
      _vec_len (cf->current_command) = cf->cursor;

      cf->search_mode = 0;
      break;

    case UNIX_CLI_PARSE_ACTION_ERASEWORDLEFT:
      /* calculate num of caracter to be erased */
      delta = 0;
      while (cf->cursor > delta
	     && cf->current_command[cf->cursor - delta - 1] == ' ')
	delta++;
      while (cf->cursor > delta
	     && cf->current_command[cf->cursor - delta - 1] != ' ')
	delta++;

      if (vec_len (cf->current_command))
	{
	  if (cf->cursor > 0)
	    {
	      /* move cursor left delta times */
	      for (j = delta; j > 0; j--, cf->cursor--)
		unix_vlib_cli_output_cursor_left (cf, uf);
	      save = cf->current_command + cf->cursor;

	      /* redraw remainder of line */
	      memmove (cf->current_command + cf->cursor,
		       cf->current_command + cf->cursor + delta,
		       _vec_len (cf->current_command) - cf->cursor - delta);
	      unix_vlib_cli_output_cooked (cf, uf,
					   cf->current_command + cf->cursor,
					   _vec_len (cf->current_command) -
					   cf->cursor);
	      cf->cursor += _vec_len (cf->current_command) - cf->cursor;

	      /* print delta amount of blank spaces,
	       * then finally fix the cursor position */
	      for (j = delta; j > 0; j--, cf->cursor--)
		unix_vlib_cli_output_cursor_left (cf, uf);
	      for (j = delta; j > 0; j--, cf->cursor++)
		unix_vlib_cli_output_cooked (cf, uf, (u8 *) " ", 1);
	      for (; (cf->current_command + cf->cursor) > save; cf->cursor--)
		unix_vlib_cli_output_cursor_left (cf, uf);
	      _vec_len (cf->current_command) -= delta;
	    }
	}
      cf->search_mode = 0;
      cf->excursion = 0;
      vec_reset_length (cf->search_key);
      break;

    case UNIX_CLI_PARSE_ACTION_LEFT:
      if (cf->cursor > 0)
	{
	  unix_vlib_cli_output_cursor_left (cf, uf);
	  cf->cursor--;
	}

      cf->search_mode = 0;
      break;

    case UNIX_CLI_PARSE_ACTION_RIGHT:
      if (cf->cursor < vec_len (cf->current_command))
	{
	  /* have to emit the character under the cursor */
	  unix_vlib_cli_output_cooked (cf, uf,
				       cf->current_command + cf->cursor, 1);
	  cf->cursor++;
	}

      cf->search_mode = 0;
      break;

    case UNIX_CLI_PARSE_ACTION_UP:
    case UNIX_CLI_PARSE_ACTION_DOWN:
      if (!cf->has_history || !cf->history_limit)
	break;
      cf->search_mode = 0;
      /* Erase the command */
      for (; cf->cursor < vec_len (cf->current_command); cf->cursor++)
	unix_vlib_cli_output_cooked (cf, uf, (u8 *) " ", 1);
      for (; cf->cursor > 0; cf->cursor--)
	{
	  unix_vlib_cli_output_cursor_left (cf, uf);
	  unix_vlib_cli_output_cooked (cf, uf, (u8 *) " ", 1);
	  unix_vlib_cli_output_cursor_left (cf, uf);
	}
      vec_reset_length (cf->current_command);
      if (vec_len (cf->command_history))
	{
	  if (action == UNIX_CLI_PARSE_ACTION_UP)
	    delta = -1;
	  else
	    delta = 1;

	  cf->excursion += delta;

	  if (cf->excursion == vec_len (cf->command_history))
	    {
	      /* down-arrowed to last entry - want a blank line */
	      _vec_len (cf->current_command) = 0;
	    }
	  else if (cf->excursion < 0)
	    {
	      /* up-arrowed over the start to the end, want a blank line */
	      cf->excursion = vec_len (cf->command_history);
	      _vec_len (cf->current_command) = 0;
	    }
	  else
	    {
	      if (cf->excursion > (i32) vec_len (cf->command_history) - 1)
		/* down-arrowed past end - wrap to start */
		cf->excursion = 0;

	      /* Print the command at the current position */
	      prev = cf->command_history[cf->excursion];
	      vec_validate (cf->current_command, vec_len (prev) - 1);

	      clib_memcpy (cf->current_command, prev, vec_len (prev));
	      _vec_len (cf->current_command) = vec_len (prev);
	      unix_vlib_cli_output_cooked (cf, uf, cf->current_command,
					   vec_len (cf->current_command));
	    }
	}
      cf->cursor = vec_len (cf->current_command);
      break;

    case UNIX_CLI_PARSE_ACTION_HOME:
      if (vec_len (cf->current_command) && cf->cursor > 0)
	{
	  for (; cf->cursor > 0; cf->cursor--)
	    unix_vlib_cli_output_cursor_left (cf, uf);
	}

      cf->search_mode = 0;
      break;

    case UNIX_CLI_PARSE_ACTION_END:
      if (vec_len (cf->current_command) &&
	  cf->cursor < vec_len (cf->current_command))
	{
	  unix_vlib_cli_output_cooked (cf, uf,
				       cf->current_command + cf->cursor,
				       vec_len (cf->current_command) -
				       cf->cursor);
	  cf->cursor = vec_len (cf->current_command);
	}

      cf->search_mode = 0;
      break;

    case UNIX_CLI_PARSE_ACTION_WORDLEFT:
      if (vec_len (cf->current_command) && cf->cursor > 0)
	{
	  unix_vlib_cli_output_cursor_left (cf, uf);
	  cf->cursor--;

	  while (cf->cursor && isspace (cf->current_command[cf->cursor]))
	    {
	      unix_vlib_cli_output_cursor_left (cf, uf);
	      cf->cursor--;
	    }
	  while (cf->cursor && !isspace (cf->current_command[cf->cursor]))
	    {
	      if (isspace (cf->current_command[cf->cursor - 1]))
		break;
	      unix_vlib_cli_output_cursor_left (cf, uf);
	      cf->cursor--;
	    }

	}

      cf->search_mode = 0;
      break;

    case UNIX_CLI_PARSE_ACTION_WORDRIGHT:
      if (vec_len (cf->current_command) &&
	  cf->cursor < vec_len (cf->current_command))
	{
	  int e = vec_len (cf->current_command);
	  j = cf->cursor;
	  while (j < e && !isspace (cf->current_command[j]))
	    j++;
	  while (j < e && isspace (cf->current_command[j]))
	    j++;
	  unix_vlib_cli_output_cooked (cf, uf,
				       cf->current_command + cf->cursor,
				       j - cf->cursor);
	  cf->cursor = j;
	}

      cf->search_mode = 0;
      break;


    case UNIX_CLI_PARSE_ACTION_ERASE:
      if (vec_len (cf->current_command))
	{
	  if (cf->cursor == vec_len (cf->current_command))
	    {
	      unix_vlib_cli_output_cursor_left (cf, uf);
	      cf->cursor--;
	      unix_vlib_cli_output_cooked (cf, uf, (u8 *) " ", 1);
	      cf->cursor++;
	      unix_vlib_cli_output_cursor_left (cf, uf);
	      cf->cursor--;
	      _vec_len (cf->current_command)--;
	    }
	  else if (cf->cursor > 0)
	    {
	      /* shift everything at & to the right of the cursor left by 1 */
	      j = vec_len (cf->current_command) - cf->cursor;
	      memmove (cf->current_command + cf->cursor - 1,
		       cf->current_command + cf->cursor, j);
	      _vec_len (cf->current_command)--;

	      /* redraw the rest of the line */
	      unix_vlib_cli_output_cursor_left (cf, uf);
	      cf->cursor--;
	      unix_vlib_cli_output_cooked (cf, uf,
					   cf->current_command + cf->cursor,
					   j);
	      cf->cursor += j;
	      /* erase last char */
	      unix_vlib_cli_output_cooked (cf, uf, (u8 *) " ", 1);
	      cf->cursor++;

	      /* and shift the terminal cursor back where it should be */
	      j += 2;		/* account for old string length and offset position */
	      while (--j)
		{
		  unix_vlib_cli_output_cursor_left (cf, uf);
		  cf->cursor--;
		}
	    }
	}
      cf->search_mode = 0;
      cf->excursion = 0;
      vec_reset_length (cf->search_key);
      break;

    case UNIX_CLI_PARSE_ACTION_ERASERIGHT:
      if (vec_len (cf->current_command))
	{
	  if (cf->cursor < vec_len (cf->current_command))
	    {
	      /* shift everything to the right of the cursor left by 1 */
	      j = vec_len (cf->current_command) - cf->cursor - 1;
	      memmove (cf->current_command + cf->cursor,
		       cf->current_command + cf->cursor + 1, j);
	      _vec_len (cf->current_command)--;
	      /* redraw the rest of the line */
	      unix_vlib_cli_output_cooked (cf, uf,
					   cf->current_command + cf->cursor,
					   j);
	      cf->cursor += j;
	      unix_vlib_cli_output_cooked (cf, uf, (u8 *) " ", 1);
	      cf->cursor++;
	      unix_vlib_cli_output_cursor_left (cf, uf);
	      cf->cursor--;
	      /* and shift the terminal cursor back where it should be */
	      if (j)
		{
		  unix_vlib_cli_output_cursor_left (cf, uf);
		  cf->cursor--;
		  while (--j)
		    {
		      unix_vlib_cli_output_cursor_left (cf, uf);
		      cf->cursor--;
		    }
		}
	    }
	}
      else if (input == 'D' - '@')
	{
	  /* ^D with no command entered = quit */
	  unix_vlib_cli_output_cooked (cf, uf, (u8 *) "quit\n", 5);
	  vlib_process_signal_event (um->vlib_main,
				     vlib_current_process (um->vlib_main),
				     UNIX_CLI_PROCESS_EVENT_QUIT,
				     cf - cm->cli_file_pool);
	}
      cf->search_mode = 0;
      cf->excursion = 0;
      vec_reset_length (cf->search_key);
      break;

    case UNIX_CLI_PARSE_ACTION_CLEAR:
      /* If we're in ANSI mode, clear the screen.
       * Then redraw the prompt and any existing command input, then put
       * the cursor back where it was in that line.
       */
      if (cf->ansi_capable)
	unix_vlib_cli_output_cooked (cf, uf,
				     (u8 *) ANSI_CLEAR,
				     sizeof (ANSI_CLEAR) - 1);
      else
	unix_vlib_cli_output_cooked (cf, uf, (u8 *) "\n", 1);

      unix_vlib_cli_output_raw (cf, uf,
				cm->cli_prompt, vec_len (cm->cli_prompt));
      unix_vlib_cli_output_cooked (cf, uf,
				   cf->current_command,
				   vec_len (cf->current_command));
      j = cf->cursor;
      cf->cursor = vec_len (cf->current_command);
      for (; cf->cursor > j; cf->cursor--)
	unix_vlib_cli_output_cursor_left (cf, uf);

      break;

    case UNIX_CLI_PARSE_ACTION_TAB:
      if (cf->cursor < vec_len (cf->current_command))
	{
	  /* if we are in the middle of a line, complete only if
	   * the cursor points to whitespace */
	  if (isspace (cf->current_command[cf->cursor]))
	    {
	      /* save and clear any input that is after the cursor */
	      vec_resize (save, vec_len (cf->current_command) - cf->cursor);
	      clib_memcpy (save, cf->current_command + cf->cursor,
			   vec_len (cf->current_command) - cf->cursor);
	      _vec_len (cf->current_command) = cf->cursor;
	    }
	  else
	    {
	      unix_vlib_cli_output_raw (cf, uf, (u8 *) "\a", 1);
	      break;
	    }
	}
      possible_commands =
	vlib_cli_get_possible_completions (cf->current_command);
      if (vec_len (possible_commands) == 1)
	{
	  u8 *completed = possible_commands[0];
	  j = cf->cursor;

	  /* find the last word of current_command */
	  while (j >= 1 && !isspace (cf->current_command[j - 1]))
	    {
	      unix_vlib_cli_output_cursor_left (cf, uf);
	      cf->cursor--;
	      j--;
	    }
	  _vec_len (cf->current_command) = j;

	  /* replace it with the newly expanded command */
	  vec_append (cf->current_command, completed);

	  /* echo to the terminal */
	  unix_vlib_cli_output_cooked (cf, uf, completed,
				       vec_len (completed));

	  /* add one trailing space if needed */
	  if (vec_len (save) == 0)
	    {
	      vec_add1 (cf->current_command, ' ');
	      unix_vlib_cli_output_cooked (cf, uf, (u8 *) " ", 1);
	    }

	  cf->cursor = vec_len (cf->current_command);

	}
      else if (vec_len (possible_commands) >= 2)
	{
	  u8 **possible_command;
	  uword max_command_len = 0, min_command_len = ~0;
	  u32 i;

	  vec_foreach (possible_command, possible_commands)
	  {
	    if (vec_len (*possible_command) > max_command_len)
	      max_command_len = vec_len (*possible_command);
	    if (vec_len (*possible_command) < min_command_len)
	      min_command_len = vec_len (*possible_command);
	  }

	  unix_vlib_cli_output_cooked (cf, uf, (u8 *) "\n", 1);

	  i = 0;
	  vec_foreach (possible_command, possible_commands)
	  {
	    if (i + max_command_len >= cf->width)
	      {
		unix_vlib_cli_output_cooked (cf, uf, (u8 *) "\n", 1);
		i = 0;
	      }
	    unix_vlib_cli_output_cooked (cf, uf, *possible_command,
					 vec_len (*possible_command));
	    for (j = vec_len (*possible_command); j < max_command_len + 2;
		 j++)
	      {
		unix_vlib_cli_output_cooked (cf, uf, (u8 *) " ", 1);
	      }
	    i += max_command_len + 2;
	  }

	  unix_vlib_cli_output_cooked (cf, uf, (u8 *) "\n", 1);

	  /* rewrite prompt */
	  unix_cli_cli_prompt (cf, uf);
	  unix_vlib_cli_output_cooked (cf, uf, cf->current_command,
				       vec_len (cf->current_command));

	  /* count length of last word */
	  j = cf->cursor;
	  i = 0;
	  while (j >= 1 && !isspace (cf->current_command[j - 1]))
	    {
	      j--;
	      i++;
	    }

	  /* determine smallest common command */
	  for (; i < min_command_len; i++)
	    {
	      u8 common = '\0';
	      int stop = 0;

	      vec_foreach (possible_command, possible_commands)
	      {
		if (common == '\0')
		  {
		    common = (*possible_command)[i];
		  }
		else if (common != (*possible_command)[i])
		  {
		    stop = 1;
		    break;
		  }
	      }

	      if (!stop)
		{
		  vec_add1 (cf->current_command, common);
		  cf->cursor++;
		  unix_vlib_cli_output_cooked (cf, uf, (u8 *) & common, 1);
		}
	      else
		{
		  break;
		}
	    }
	}
      else
	{
	  unix_vlib_cli_output_raw (cf, uf, (u8 *) "\a", 1);
	}

      if (vec_len (save) > 0)
	{
	  /* restore remaining input if tab was hit in the middle of a line */
	  unix_vlib_cli_output_cooked (cf, uf, save, vec_len (save));
	  cf->cursor += vec_len (save);
	  for (j = 0; j < vec_len (save); j++, cf->cursor--)
	    unix_vlib_cli_output_cursor_left (cf, uf);
	  vec_append (cf->current_command, save);
	  vec_free (save);
	}
      vec_free (possible_commands);

      break;
    case UNIX_CLI_PARSE_ACTION_YANK:
      /* TODO */
      break;


    case UNIX_CLI_PARSE_ACTION_PAGER_QUIT:
    pager_quit:
      unix_cli_pager_prompt_erase (cf, uf);
      unix_cli_pager_reset (cf);
      unix_cli_cli_prompt (cf, uf);
      break;

    case UNIX_CLI_PARSE_ACTION_PAGER_NEXT:
    case UNIX_CLI_PARSE_ACTION_PAGER_PGDN:
      /* show next page of the buffer */
      if (cf->height + cf->pager_start <= vec_len (cf->pager_index))
	{
	  u8 *line = NULL;
	  unix_cli_pager_index_t *pi = NULL;

	  int m = cf->pager_start + (cf->height - 1);
	  unix_cli_pager_prompt_erase (cf, uf);
	  for (j = m;
	       j < vec_len (cf->pager_index) && cf->pager_start < m;
	       j++, cf->pager_start++)
	    {
	      pi = &cf->pager_index[j];
	      line = cf->pager_vector[pi->line] + pi->offset;
	      unix_vlib_cli_output_cooked (cf, uf, line, pi->length);
	    }
	  /* if the last line didn't end in newline, add a newline */
	  if (pi && line[pi->length - 1] != '\n')
	    unix_vlib_cli_output_cooked (cf, uf, (u8 *) "\n", 1);
	  unix_cli_pager_prompt (cf, uf);
	}
      else
	{
	  if (action == UNIX_CLI_PARSE_ACTION_PAGER_NEXT)
	    /* no more in buffer, exit, but only if it was <space> */
	    goto pager_quit;
	}
      break;

    case UNIX_CLI_PARSE_ACTION_PAGER_DN:
    case UNIX_CLI_PARSE_ACTION_PAGER_CRLF:
      /* display the next line of the buffer */
      if (cf->height + cf->pager_start <= vec_len (cf->pager_index))
	{
	  u8 *line;
	  unix_cli_pager_index_t *pi;

	  unix_cli_pager_prompt_erase (cf, uf);
	  pi = &cf->pager_index[cf->pager_start + (cf->height - 1)];
	  line = cf->pager_vector[pi->line] + pi->offset;
	  unix_vlib_cli_output_cooked (cf, uf, line, pi->length);
	  cf->pager_start++;
	  /* if the last line didn't end in newline, add a newline */
	  if (line[pi->length - 1] != '\n')
	    unix_vlib_cli_output_cooked (cf, uf, (u8 *) "\n", 1);
	  unix_cli_pager_prompt (cf, uf);
	}
      else
	{
	  if (action == UNIX_CLI_PARSE_ACTION_PAGER_CRLF)
	    /* no more in buffer, exit, but only if it was <enter> */
	    goto pager_quit;
	}

      break;

    case UNIX_CLI_PARSE_ACTION_PAGER_UP:
      /* scroll the page back one line */
      if (cf->pager_start > 0)
	{
	  u8 *line = NULL;
	  unix_cli_pager_index_t *pi = NULL;

	  cf->pager_start--;
	  if (cf->ansi_capable)
	    {
	      pi = &cf->pager_index[cf->pager_start];
	      line = cf->pager_vector[pi->line] + pi->offset;
	      unix_cli_pager_prompt_erase (cf, uf);
	      unix_vlib_cli_output_cooked (cf, uf, (u8 *) ANSI_SCROLLDN,
					   sizeof (ANSI_SCROLLDN) - 1);
	      unix_vlib_cli_output_cooked (cf, uf, (u8 *) ANSI_SAVECURSOR,
					   sizeof (ANSI_SAVECURSOR) - 1);
	      unix_cli_ansi_cursor (cf, uf, 1, 1);
	      unix_vlib_cli_output_cooked (cf, uf, (u8 *) ANSI_CLEARLINE,
					   sizeof (ANSI_CLEARLINE) - 1);
	      unix_vlib_cli_output_cooked (cf, uf, line, pi->length);
	      unix_vlib_cli_output_cooked (cf, uf, (u8 *) ANSI_RESTCURSOR,
					   sizeof (ANSI_RESTCURSOR) - 1);
	      unix_cli_pager_prompt_erase (cf, uf);
	      unix_cli_pager_prompt (cf, uf);
	    }
	  else
	    {
	      int m = cf->pager_start + (cf->height - 1);
	      unix_cli_pager_prompt_erase (cf, uf);
	      for (j = cf->pager_start;
		   j < vec_len (cf->pager_index) && j < m; j++)
		{
		  pi = &cf->pager_index[j];
		  line = cf->pager_vector[pi->line] + pi->offset;
		  unix_vlib_cli_output_cooked (cf, uf, line, pi->length);
		}
	      /* if the last line didn't end in newline, add a newline */
	      if (pi && line[pi->length - 1] != '\n')
		unix_vlib_cli_output_cooked (cf, uf, (u8 *) "\n", 1);
	      unix_cli_pager_prompt (cf, uf);
	    }
	}
      break;

    case UNIX_CLI_PARSE_ACTION_PAGER_TOP:
      /* back to the first page of the buffer */
      if (cf->pager_start > 0)
	{
	  u8 *line = NULL;
	  unix_cli_pager_index_t *pi = NULL;

	  cf->pager_start = 0;
	  int m = cf->pager_start + (cf->height - 1);
	  unix_cli_pager_prompt_erase (cf, uf);
	  for (j = cf->pager_start; j < vec_len (cf->pager_index) && j < m;
	       j++)
	    {
	      pi = &cf->pager_index[j];
	      line = cf->pager_vector[pi->line] + pi->offset;
	      unix_vlib_cli_output_cooked (cf, uf, line, pi->length);
	    }
	  /* if the last line didn't end in newline, add a newline */
	  if (pi && line[pi->length - 1] != '\n')
	    unix_vlib_cli_output_cooked (cf, uf, (u8 *) "\n", 1);
	  unix_cli_pager_prompt (cf, uf);
	}
      break;

    case UNIX_CLI_PARSE_ACTION_PAGER_BOTTOM:
      /* skip to the last page of the buffer */
      if (cf->pager_start < vec_len (cf->pager_index) - (cf->height - 1))
	{
	  u8 *line = NULL;
	  unix_cli_pager_index_t *pi = NULL;

	  cf->pager_start = vec_len (cf->pager_index) - (cf->height - 1);
	  unix_cli_pager_prompt_erase (cf, uf);
	  unix_cli_pager_message (cf, uf, "skipping", "\n");
	  for (j = cf->pager_start; j < vec_len (cf->pager_index); j++)
	    {
	      pi = &cf->pager_index[j];
	      line = cf->pager_vector[pi->line] + pi->offset;
	      unix_vlib_cli_output_cooked (cf, uf, line, pi->length);
	    }
	  /* if the last line didn't end in newline, add a newline */
	  if (pi && line[pi->length - 1] != '\n')
	    unix_vlib_cli_output_cooked (cf, uf, (u8 *) "\n", 1);
	  unix_cli_pager_prompt (cf, uf);
	}
      break;

    case UNIX_CLI_PARSE_ACTION_PAGER_PGUP:
      /* wander back one page in the buffer */
      if (cf->pager_start > 0)
	{
	  u8 *line = NULL;
	  unix_cli_pager_index_t *pi = NULL;
	  int m;

	  if (cf->pager_start >= cf->height)
	    cf->pager_start -= cf->height - 1;
	  else
	    cf->pager_start = 0;
	  m = cf->pager_start + cf->height - 1;
	  unix_cli_pager_prompt_erase (cf, uf);
	  for (j = cf->pager_start; j < vec_len (cf->pager_index) && j < m;
	       j++)
	    {
	      pi = &cf->pager_index[j];
	      line = cf->pager_vector[pi->line] + pi->offset;
	      unix_vlib_cli_output_cooked (cf, uf, line, pi->length);
	    }
	  /* if the last line didn't end in newline, add a newline */
	  if (pi && line[pi->length - 1] != '\n')
	    unix_vlib_cli_output_cooked (cf, uf, (u8 *) "\n", 1);
	  unix_cli_pager_prompt (cf, uf);
	}
      break;

    case UNIX_CLI_PARSE_ACTION_PAGER_REDRAW:
      /* Redraw the current pager screen */
      unix_cli_pager_redraw (cf, uf);
      break;

    case UNIX_CLI_PARSE_ACTION_PAGER_SEARCH:
      /* search forwards in the buffer */
      break;


    case UNIX_CLI_PARSE_ACTION_CRLF:
    crlf:
      unix_vlib_cli_output_cooked (cf, uf, (u8 *) "\n", 1);

      if (cf->has_history && cf->history_limit)
	{
	  if (cf->command_history
	      && vec_len (cf->command_history) >= cf->history_limit)
	    {
	      vec_free (cf->command_history[0]);
	      vec_delete (cf->command_history, 1, 0);
	    }
	  /* Don't add blank lines to the cmd history */
	  if (vec_len (cf->current_command))
	    {
	      /* Don't duplicate the previous command */
	      j = vec_len (cf->command_history);
	      if (j == 0 ||
		  (vec_len (cf->current_command) !=
		   vec_len (cf->command_history[j - 1])
		   || memcmp (cf->current_command, cf->command_history[j - 1],
			      vec_len (cf->current_command)) != 0))
		{
		  /* copy the command to the history */
		  u8 *c = 0;
		  vec_append (c, cf->current_command);
		  vec_add1 (cf->command_history, c);
		  cf->command_number++;
		}
	    }
	  cf->excursion = vec_len (cf->command_history);
	}

      cf->search_mode = 0;
      vec_reset_length (cf->search_key);
      cf->cursor = 0;

      return 0;

    case UNIX_CLI_PARSE_ACTION_PARTIALMATCH:
    case UNIX_CLI_PARSE_ACTION_NOMATCH:
      if (vec_len (cf->pager_index))
	{
	  /* no-op for now */
	}
      else if (cf->has_history && cf->search_mode != 0 && isprint (input))
	{
	  int k, limit, offset;
	  u8 *item;

	  vec_add1 (cf->search_key, input);

	search_again:
	  for (j = 0; j < vec_len (cf->command_history); j++)
	    {
	      if (cf->excursion > (i32) vec_len (cf->command_history) - 1)
		cf->excursion = 0;
	      else if (cf->excursion < 0)
		cf->excursion = vec_len (cf->command_history) - 1;

	      item = cf->command_history[cf->excursion];

	      limit = (vec_len (cf->search_key) > vec_len (item)) ?
		vec_len (item) : vec_len (cf->search_key);

	      for (offset = 0; offset <= vec_len (item) - limit; offset++)
		{
		  for (k = 0; k < limit; k++)
		    {
		      if (item[k + offset] != cf->search_key[k])
			goto next_offset;
		    }
		  goto found_at_offset;

		next_offset:
		  ;
		}
	      goto next;

	    found_at_offset:
	      for (; cf->cursor > 0; cf->cursor--)
		{
		  unix_vlib_cli_output_cursor_left (cf, uf);
		  unix_vlib_cli_output_cooked (cf, uf, (u8 *) " ", 1);
		  unix_vlib_cli_output_cursor_left (cf, uf);
		}

	      vec_validate (cf->current_command, vec_len (item) - 1);
	      clib_memcpy (cf->current_command, item, vec_len (item));
	      _vec_len (cf->current_command) = vec_len (item);

	      unix_vlib_cli_output_cooked (cf, uf, cf->current_command,
					   vec_len (cf->current_command));
	      cf->cursor = vec_len (cf->current_command);
	      goto found;

	    next:
	      cf->excursion += cf->search_mode;
	    }

	  unix_vlib_cli_output_cooked (cf, uf, (u8 *) "\nNo match...", 12);
	  vec_reset_length (cf->search_key);
	  vec_reset_length (cf->current_command);
	  cf->search_mode = 0;
	  cf->cursor = 0;
	  goto crlf;
	}
      else if (isprint (input))	/* skip any errant control codes */
	{
	  if (cf->cursor == vec_len (cf->current_command))
	    {
	      /* Append to end */
	      vec_add1 (cf->current_command, input);
	      cf->cursor++;

	      /* Echo the character back to the client */
	      unix_vlib_cli_output_cooked (cf, uf, &input, 1);
	    }
	  else
	    {
	      /* Insert at cursor: resize +1 byte, move everything over */
	      j = vec_len (cf->current_command) - cf->cursor;
	      vec_add1 (cf->current_command, (u8) 'A');
	      memmove (cf->current_command + cf->cursor + 1,
		       cf->current_command + cf->cursor, j);
	      cf->current_command[cf->cursor] = input;
	      /* Redraw the line */
	      j++;
	      unix_vlib_cli_output_cooked (cf, uf,
					   cf->current_command + cf->cursor,
					   j);
	      cf->cursor += j;
	      j--;
	      /* Put terminal cursor back */
	      for (; j > 0; j--, cf->cursor--)
		unix_vlib_cli_output_cursor_left (cf, uf);
	    }
	}
      else
	{
	  /* no-op - not printable or otherwise not actionable */
	}

    found:

      break;

    case UNIX_CLI_PARSE_ACTION_TELNETIAC:
      break;
    }
  return 1;
}

/** @brief Process input bytes on a stream to provide line editing and
 * command history in the CLI. */
static int
unix_cli_line_edit (unix_cli_main_t * cm, unix_main_t * um,
		    clib_file_main_t * fm, unix_cli_file_t * cf)
{
  clib_file_t *uf = pool_elt_at_index (fm->file_pool, cf->clib_file_index);
  int i;

  for (i = 0; i < vec_len (cf->input_vector); i++)
    {
      unix_cli_parse_action_t action;
      i32 matched = 0;
      unix_cli_parse_actions_t *a;

      /* If we're in the pager mode, search the pager actions */
      a =
	vec_len (cf->pager_index) ? unix_cli_parse_pager :
	unix_cli_parse_strings;

      /* See if the input buffer is some sort of control code */
      action = unix_cli_match_action (a, &cf->input_vector[i],
				      vec_len (cf->input_vector) - i,
				      &matched);

      switch (action)
	{
	case UNIX_CLI_PARSE_ACTION_PARTIALMATCH:
	  if (i)
	    {
	      /* There was a partial match which means we need more bytes
	       * than the input buffer currently has.
	       * Since the bytes before here have been processed, shift
	       * the remaining contents to the start of the input buffer.
	       */
	      vec_delete (cf->input_vector, i, 0);
	    }
	  return 1;		/* wait for more */

	case UNIX_CLI_PARSE_ACTION_TELNETIAC:
	  /* process telnet options */
	  matched = unix_cli_process_telnet (um, cf, uf,
					     cf->input_vector + i,
					     vec_len (cf->input_vector) - i);
	  if (matched < 0)
	    {
	      /* There was a partial match which means we need more bytes
	       * than the input buffer currently has.
	       */
	      if (i)
		{
		  /*
		   * Since the bytes before here have been processed, shift
		   * the remaining contents to the start of the input buffer.
		   */
		  vec_delete (cf->input_vector, i, 0);
		}
	      return 1;		/* wait for more */
	    }
	  break;

	default:
	  /* If telnet option processing switched us to line mode, get us
	   * out of here!
	   */
	  if (cf->line_mode)
	    {
	      vec_delete (cf->input_vector, i, 0);
	      cf->current_command = cf->input_vector;
	      return 0;
	    }

	  /* process the action */
	  if (!unix_cli_line_process_one (cm, um, cf, uf,
					  cf->input_vector[i], action))
	    {
	      /* CRLF found. Consume the bytes from the input_vector */
	      vec_delete (cf->input_vector, i + matched, 0);
	      /* And tell our caller to execute cf->input_command */
	      return 0;
	    }
	}

      i += matched;
    }

  vec_reset_length (cf->input_vector);
  return 1;
}

/** @brief Process input to a CLI session. */
static void
unix_cli_process_input (unix_cli_main_t * cm, uword cli_file_index)
{
  unix_main_t *um = &unix_main;
  clib_file_main_t *fm = &file_main;
  clib_file_t *uf;
  unix_cli_file_t *cf = pool_elt_at_index (cm->cli_file_pool, cli_file_index);
  unformat_input_t input;
  int vlib_parse_eval (u8 *);

  cm->current_input_file_index = cli_file_index;

more:
  /* Try vlibplex first.  Someday... */
  if (0 && vlib_parse_eval (cf->input_vector) == 0)
    goto done;


  if (cf->line_mode)
    {
      /* just treat whatever we got as a complete line of input */
      cf->current_command = cf->input_vector;
    }
  else
    {
      /* Line edit, echo, etc. */
      if (unix_cli_line_edit (cm, um, fm, cf))
	/* want more input */
	return;
    }

  if (um->log_fd)
    {
      static u8 *lv;
      vec_reset_length (lv);
      lv = format (lv, "%U[%d]: %v",
		   format_timeval, 0 /* current bat-time */ ,
		   0 /* current bat-format */ ,
		   cli_file_index, cf->current_command);
      int rv __attribute__ ((unused)) = write (um->log_fd, lv, vec_len (lv));
    }

  /* Build an unformat structure around our command */
  unformat_init_vector (&input, cf->current_command);

  /* Remove leading white space from input. */
  (void) unformat (&input, "");

  cf->pager_start = 0;		/* start a new pager session */

  if (unformat_check_input (&input) != UNFORMAT_END_OF_INPUT)
    vlib_cli_input (um->vlib_main, &input, unix_vlib_cli_output,
		    cli_file_index);

  /* Zero buffer since otherwise unformat_free will call vec_free on it. */
  input.buffer = 0;

  unformat_free (&input);

  /* Re-fetch pointer since pool may have moved. */
  cf = pool_elt_at_index (cm->cli_file_pool, cli_file_index);
  uf = pool_elt_at_index (fm->file_pool, cf->clib_file_index);

done:
  /* reset vector; we'll re-use it later  */
  if (cf->line_mode)
    {
      vec_reset_length (cf->input_vector);
      cf->current_command = 0;
    }
  else
    {
      vec_reset_length (cf->current_command);
    }

  if (cf->no_pager == 2)
    {
      /* Pager was programmatically disabled */
      unix_cli_pager_message (cf, uf, "pager buffer overflowed", "\n");
      cf->no_pager = um->cli_no_pager;
    }

  if (vec_len (cf->pager_index) == 0
      || vec_len (cf->pager_index) < cf->height)
    {
      /* There was no need for the pager */
      unix_cli_pager_reset (cf);

      /* Prompt. */
      unix_cli_cli_prompt (cf, uf);
    }
  else
    {
      /* Display the pager prompt */
      unix_cli_pager_prompt (cf, uf);
    }

  /* Any residual data in the input vector? */
  if (vec_len (cf->input_vector))
    goto more;

  /* For non-interactive sessions send a NUL byte.
   * Specifically this is because vppctl needs to see some traffic in
   * order to move on to closing the session. Commands with no output
   * would thus cause vppctl to hang indefinitely in non-interactive mode
   * since there is also no prompt sent after the command completes.
   */
  if (!cf->is_interactive)
    unix_vlib_cli_output_raw (cf, uf, (u8 *) "\0", 1);
}

/** Destroy a CLI session.
 * @note If we destroy the @c stdin session this additionally signals
 *       the shutdown of VPP.
 */
static void
unix_cli_kill (unix_cli_main_t * cm, uword cli_file_index)
{
  unix_main_t *um = &unix_main;
  clib_file_main_t *fm = &file_main;
  unix_cli_file_t *cf;
  clib_file_t *uf;
  int i;

  /* Validate cli_file_index */
  if (pool_is_free_index (cm->cli_file_pool, cli_file_index))
    return;

  cf = pool_elt_at_index (cm->cli_file_pool, cli_file_index);
  uf = pool_elt_at_index (fm->file_pool, cf->clib_file_index);

  /* Quit/EOF on stdin means quit program. */
  if (uf->file_descriptor == STDIN_FILENO)
    clib_longjmp (&um->vlib_main->main_loop_exit, VLIB_MAIN_LOOP_EXIT_CLI);

  vec_free (cf->current_command);
  vec_free (cf->search_key);

  for (i = 0; i < vec_len (cf->command_history); i++)
    vec_free (cf->command_history[i]);

  vec_free (cf->command_history);

  clib_file_del (fm, uf);

  unix_cli_file_free (cf);
  pool_put (cm->cli_file_pool, cf);
}

/** Handle system events. */
static uword
unix_cli_process (vlib_main_t * vm,
		  vlib_node_runtime_t * rt, vlib_frame_t * f)
{
  unix_cli_main_t *cm = &unix_cli_main;
  uword i, *data = 0;

  while (1)
    {
      unix_cli_process_event_type_t event_type;
      vlib_process_wait_for_event (vm);
      event_type = vlib_process_get_events (vm, &data);

      switch (event_type)
	{
	case UNIX_CLI_PROCESS_EVENT_READ_READY:
	  for (i = 0; i < vec_len (data); i++)
	    unix_cli_process_input (cm, data[i]);
	  break;

	case UNIX_CLI_PROCESS_EVENT_QUIT:
	  /* Kill this process. */
	  for (i = 0; i < vec_len (data); i++)
	    unix_cli_kill (cm, data[i]);
	  goto done;
	}

      if (data)
	_vec_len (data) = 0;
    }

done:
  vec_free (data);

  vlib_node_set_state (vm, rt->node_index, VLIB_NODE_STATE_DISABLED);

  /* Add node index so we can re-use this process later. */
  vec_add1 (cm->unused_cli_process_node_indices, rt->node_index);

  return 0;
}

/** Called when a CLI session file descriptor can be written to without
 * blocking. */
static clib_error_t *
unix_cli_write_ready (clib_file_t * uf)
{
  unix_cli_main_t *cm = &unix_cli_main;
  unix_cli_file_t *cf;
  int n;

  cf = pool_elt_at_index (cm->cli_file_pool, uf->private_data);

  /* Flush output vector. */
  if (cf->is_socket)
    /* If it's a socket we use MSG_NOSIGNAL to prevent SIGPIPE */
    n = send (uf->file_descriptor,
	      cf->output_vector, vec_len (cf->output_vector), MSG_NOSIGNAL);
  else
    n = write (uf->file_descriptor,
	       cf->output_vector, vec_len (cf->output_vector));

  if (n < 0 && errno != EAGAIN)
    {
      if (errno == EPIPE)
	{
	  /* connection closed on us */
	  unix_main_t *um = &unix_main;
	  cf->has_epipe = 1;
	  vlib_process_signal_event (um->vlib_main, cf->process_node_index,
				     UNIX_CLI_PROCESS_EVENT_QUIT,
				     uf->private_data);
	}
      else
	{
	  return clib_error_return_unix (0, "write");
	}
    }

  else if (n > 0)
    unix_cli_del_pending_output (uf, cf, n);

  return /* no error */ 0;
}

/** Called when a CLI session file descriptor has data to be read. */
static clib_error_t *
unix_cli_read_ready (clib_file_t * uf)
{
  unix_main_t *um = &unix_main;
  unix_cli_main_t *cm = &unix_cli_main;
  unix_cli_file_t *cf;
  uword l;
  int n, n_read, n_try;

  cf = pool_elt_at_index (cm->cli_file_pool, uf->private_data);

  n = n_try = 4096;
  while (n == n_try)
    {
      l = vec_len (cf->input_vector);
      vec_resize (cf->input_vector, l + n_try);

      n = read (uf->file_descriptor, cf->input_vector + l, n_try);

      /* Error? */
      if (n < 0 && errno != EAGAIN)
	return clib_error_return_unix (0, "read");

      n_read = n < 0 ? 0 : n;
      _vec_len (cf->input_vector) = l + n_read;
    }

  if (!(n < 0))
    vlib_process_signal_event (um->vlib_main,
			       cf->process_node_index,
			       (n_read == 0
				? UNIX_CLI_PROCESS_EVENT_QUIT
				: UNIX_CLI_PROCESS_EVENT_READ_READY),
			       /* event data */ uf->private_data);

  return /* no error */ 0;
}

/** Called when a CLI session file descriptor has an error condition. */
static clib_error_t *
unix_cli_error_detected (clib_file_t * uf)
{
  unix_main_t *um = &unix_main;
  unix_cli_main_t *cm = &unix_cli_main;
  unix_cli_file_t *cf;

  cf = pool_elt_at_index (cm->cli_file_pool, uf->private_data);
  cf->has_epipe = 1;		/* prevent writes while the close is pending */
  vlib_process_signal_event (um->vlib_main,
			     cf->process_node_index,
			     UNIX_CLI_PROCESS_EVENT_QUIT,
			     /* event data */ uf->private_data);

  return /* no error */ 0;
}

/** Store a new CLI session.
 * @param name The name of the session.
 * @param fd   The file descriptor for the session I/O.
 * @return The session ID.
 */
static u32
unix_cli_file_add (unix_cli_main_t * cm, char *name, int fd)
{
  unix_main_t *um = &unix_main;
  clib_file_main_t *fm = &file_main;
  unix_cli_file_t *cf;
  clib_file_t template = { 0 };
  vlib_main_t *vm = um->vlib_main;
  vlib_node_t *n = 0;
  u8 *file_desc = 0;

  file_desc = format (0, "%s", name);

  name = (char *) format (0, "unix-cli-%s", name);

  if (vec_len (cm->unused_cli_process_node_indices) > 0)
    {
      uword l = vec_len (cm->unused_cli_process_node_indices);
      int i;
      vlib_main_t *this_vlib_main;
      u8 *old_name = 0;

      /*
       * Nodes are bulk-copied, so node name pointers are shared.
       * Find the cli node in all graph replicas, and give all of them
       * the same new name.
       * Then, throw away the old shared name-vector.
       */
      for (i = 0; i < vec_len (vlib_mains); i++)
	{
	  this_vlib_main = vlib_mains[i];
	  if (this_vlib_main == 0)
	    continue;
	  n = vlib_get_node (this_vlib_main,
			     cm->unused_cli_process_node_indices[l - 1]);
	  old_name = n->name;
	  n->name = (u8 *) name;
	}
      vec_free (old_name);

      vlib_node_set_state (vm, n->index, VLIB_NODE_STATE_POLLING);

      _vec_len (cm->unused_cli_process_node_indices) = l - 1;
    }
  else
    {
      static vlib_node_registration_t r = {
	.function = unix_cli_process,
	.type = VLIB_NODE_TYPE_PROCESS,
	.process_log2_n_stack_bytes = 17,
      };

      r.name = name;

      vlib_worker_thread_barrier_sync (vm);

      vlib_register_node (vm, &r);
      vec_free (name);

      n = vlib_get_node (vm, r.index);
      vlib_worker_thread_node_runtime_update ();
      vlib_worker_thread_barrier_release (vm);
    }

  pool_get (cm->cli_file_pool, cf);
  clib_memset (cf, 0, sizeof (*cf));

  template.read_function = unix_cli_read_ready;
  template.write_function = unix_cli_write_ready;
  template.error_function = unix_cli_error_detected;
  template.file_descriptor = fd;
  template.private_data = cf - cm->cli_file_pool;
  template.description = file_desc;

  cf->process_node_index = n->index;
  cf->clib_file_index = clib_file_add (fm, &template);
  cf->output_vector = 0;
  cf->input_vector = 0;

  vlib_start_process (vm, n->runtime_index);

  vlib_process_t *p = vlib_get_process_from_node (vm, n);
  p->output_function = unix_vlib_cli_output;
  p->output_function_arg = cf - cm->cli_file_pool;

  return cf - cm->cli_file_pool;
}

/** Telnet listening socket has a new connection. */
static clib_error_t *
unix_cli_listen_read_ready (clib_file_t * uf)
{
  unix_main_t *um = &unix_main;
  clib_file_main_t *fm = &file_main;
  unix_cli_main_t *cm = &unix_cli_main;
  clib_socket_t *s = &um->cli_listen_socket;
  clib_socket_t client;
  char *client_name;
  clib_error_t *error;
  unix_cli_file_t *cf;
  u32 cf_index;
  int one;

  error = clib_socket_accept (s, &client);
  if (error)
    return error;

  /* Disable Nagle, ignore any errors doing so eg on PF_LOCAL socket */
  one = 1;
  (void) setsockopt (client.fd, IPPROTO_TCP, TCP_NODELAY,
		     (void *) &one, sizeof (one));

  client_name = (char *) format (0, "%U%c", format_sockaddr, &client.peer, 0);

  cf_index = unix_cli_file_add (cm, client_name, client.fd);
  cf = pool_elt_at_index (cm->cli_file_pool, cf_index);
  cf->is_socket = 1;

  /* No longer need CLIB version of socket. */
  clib_socket_free (&client);
  vec_free (client_name);

  /* if we're supposed to run telnet session in character mode (default) */
  if (um->cli_line_mode == 0)
    {
      /*
       * Set telnet client character mode, echo on, suppress "go-ahead".
       * Technically these should be negotiated, but this works.
       */
      u8 charmode_option[] = {
	IAC, WONT, TELOPT_LINEMODE,	/* server will do char-by-char */
	IAC, DONT, TELOPT_LINEMODE,	/* client should do char-by-char */
	IAC, WILL, TELOPT_SGA,	/* server willl supress GA */
	IAC, DO, TELOPT_SGA,	/* client should supress Go Ahead */
	IAC, WILL, TELOPT_ECHO,	/* server will do echo */
	IAC, DONT, TELOPT_ECHO,	/* client should not echo */
	IAC, DO, TELOPT_TTYPE,	/* client should tell us its term type */
	IAC, SB, TELOPT_TTYPE, 1, IAC, SE,	/* now tell me ttype */
	IAC, DO, TELOPT_NAWS,	/* client should tell us its window sz */
	IAC, SB, TELOPT_NAWS, 1, IAC, SE,	/* now tell me window size */
      };

      /* Enable history on this CLI */
      cf->history_limit = um->cli_history_limit;
      cf->has_history = cf->history_limit != 0;

      /* This is an interactive session until we decide otherwise */
      cf->is_interactive = 1;

      /* Make sure this session is in line mode */
      cf->line_mode = 0;

      /* We need CRLF */
      cf->crlf_mode = 1;

      /* Setup the pager */
      cf->no_pager = um->cli_no_pager;

      /* Default terminal dimensions, should the terminal
       * fail to provide any.
       */
      cf->width = UNIX_CLI_DEFAULT_TERMINAL_WIDTH;
      cf->height = UNIX_CLI_DEFAULT_TERMINAL_HEIGHT;

      /* Send the telnet options */
      uf = pool_elt_at_index (fm->file_pool, cf->clib_file_index);
      unix_vlib_cli_output_raw (cf, uf, charmode_option,
				ARRAY_LEN (charmode_option));

      if (cm->new_session_process_node_index == ~0)
	{
	  /* Create thw new session deadline process */
	  cm->new_session_process_node_index =
	    vlib_process_create (um->vlib_main, "unix-cli-new-session",
				 unix_cli_new_session_process,
				 16 /* log2_n_stack_bytes */ );
	}

      /* In case the client doesn't negotiate terminal type, register
       * our session with a process that will emit the prompt if
       * a deadline passes */
      vlib_process_signal_event (um->vlib_main,
				 cm->new_session_process_node_index,
				 UNIX_CLI_NEW_SESSION_EVENT_ADD, cf_index);

    }

  return error;
}

/** The system terminal has informed us that the window size
 * has changed.
 */
static void
unix_cli_resize_interrupt (int signum)
{
  clib_file_main_t *fm = &file_main;
  unix_cli_main_t *cm = &unix_cli_main;
  unix_cli_file_t *cf = pool_elt_at_index (cm->cli_file_pool,
					   cm->stdin_cli_file_index);
  clib_file_t *uf = pool_elt_at_index (fm->file_pool, cf->clib_file_index);
  struct winsize ws;
  (void) signum;

  /* Terminal resized, fetch the new size */
  if (ioctl (STDIN_FILENO, TIOCGWINSZ, &ws) < 0)
    {
      /* "Should never happen..." */
      clib_unix_warning ("TIOCGWINSZ");
      /* We can't trust ws.XXX... */
      return;
    }

  cf->width = ws.ws_col;
  if (cf->width > UNIX_CLI_MAX_TERMINAL_WIDTH)
    cf->width = UNIX_CLI_MAX_TERMINAL_WIDTH;
  if (cf->width == 0)
    cf->width = UNIX_CLI_DEFAULT_TERMINAL_WIDTH;

  cf->height = ws.ws_row;
  if (cf->height > UNIX_CLI_MAX_TERMINAL_HEIGHT)
    cf->height = UNIX_CLI_MAX_TERMINAL_HEIGHT;
  if (cf->height == 0)
    cf->height = UNIX_CLI_DEFAULT_TERMINAL_HEIGHT;

  /* Reindex the pager buffer */
  unix_cli_pager_reindex (cf);

  /* Redraw the page */
  unix_cli_pager_redraw (cf, uf);
}

/** Handle configuration directives in the @em unix section. */
static clib_error_t *
unix_cli_config (vlib_main_t * vm, unformat_input_t * input)
{
  unix_main_t *um = &unix_main;
  clib_file_main_t *fm = &file_main;
  unix_cli_main_t *cm = &unix_cli_main;
  int flags;
  clib_error_t *error = 0;
  unix_cli_file_t *cf;
  u32 cf_index;
  struct termios tio;
  struct sigaction sa;
  struct winsize ws;
  u8 *term;

  /* We depend on unix flags being set. */
  if ((error = vlib_call_config_function (vm, unix_config)))
    return error;

  if (um->flags & UNIX_FLAG_INTERACTIVE)
    {
      /* Set stdin to be non-blocking. */
      if ((flags = fcntl (STDIN_FILENO, F_GETFL, 0)) < 0)
	flags = 0;
      (void) fcntl (STDIN_FILENO, F_SETFL, flags | O_NONBLOCK);

      cf_index = unix_cli_file_add (cm, "stdin", STDIN_FILENO);
      cf = pool_elt_at_index (cm->cli_file_pool, cf_index);
      cm->stdin_cli_file_index = cf_index;

      /* If stdin is a tty and we are using chacracter mode, enable
       * history on the CLI and set the tty line discipline accordingly. */
      if (isatty (STDIN_FILENO) && um->cli_line_mode == 0)
	{
	  /* Capture terminal resize events */
	  clib_memset (&sa, 0, sizeof (sa));
	  sa.sa_handler = unix_cli_resize_interrupt;
	  if (sigaction (SIGWINCH, &sa, 0) < 0)
	    clib_panic ("sigaction");

	  /* Retrieve the current terminal size */
	  ioctl (STDIN_FILENO, TIOCGWINSZ, &ws);
	  cf->width = ws.ws_col;
	  cf->height = ws.ws_row;

	  if (cf->width == 0 || cf->height == 0)
	    {
	      /*
	       * We have a tty, but no size. Use defaults.
	       * vpp "unix interactive" inside emacs + gdb ends up here.
	       */
	      cf->width = UNIX_CLI_DEFAULT_TERMINAL_WIDTH;
	      cf->height = UNIX_CLI_DEFAULT_TERMINAL_HEIGHT;
	    }

	  /* Setup the history */
	  cf->history_limit = um->cli_history_limit;
	  cf->has_history = cf->history_limit != 0;

	  /* Setup the pager */
	  cf->no_pager = um->cli_no_pager;

	  /* This is an interactive session until we decide otherwise */
	  cf->is_interactive = 1;

	  /* We're going to be in char by char mode */
	  cf->line_mode = 0;

	  /* Save the original tty state so we can restore it later */
	  tcgetattr (STDIN_FILENO, &um->tio_stdin);
	  um->tio_isset = 1;

	  /* Tweak the tty settings */
	  tio = um->tio_stdin;
	  /* echo off, canonical mode off, ext'd input processing off */
	  tio.c_lflag &= ~(ECHO | ICANON | IEXTEN);
	  /* disable XON/XOFF, so ^S invokes the history search */
	  tio.c_iflag &= ~(IXON | IXOFF);
	  tio.c_cc[VMIN] = 1;	/* 1 byte at a time */
	  tio.c_cc[VTIME] = 0;	/* no timer */
	  tio.c_cc[VSTOP] = _POSIX_VDISABLE;	/* not ^S */
	  tio.c_cc[VSTART] = _POSIX_VDISABLE;	/* not ^Q */
	  tcsetattr (STDIN_FILENO, TCSAFLUSH, &tio);

	  /* See if we can do ANSI/VT100 output */
	  term = (u8 *) getenv ("TERM");
	  if (term != NULL)
	    {
	      int len = strlen ((char *) term);
	      cf->ansi_capable = unix_cli_terminal_type_ansi (term, len);
	      if (unix_cli_terminal_type_noninteractive (term, len))
		unix_cli_set_session_noninteractive (cf);
	    }
	}
      else
	{
	  /* No tty, so make sure the session doesn't have tty-like features */
	  unix_cli_set_session_noninteractive (cf);
	}

      /* Send banner and initial prompt */
      unix_cli_file_welcome (cm, cf);
    }

  /* If we have socket config, LISTEN, otherwise, don't */
  clib_socket_t *s = &um->cli_listen_socket;
  if (s->config && s->config[0] != 0)
    {
      /* CLI listen. */
      clib_file_t template = { 0 };

      /* mkdir of file socketu, only under /run  */
      if (strncmp (s->config, "/run", 4) == 0)
	{
	  u8 *tmp = format (0, "%s", s->config);
	  int i = vec_len (tmp);
	  while (i && tmp[--i] != '/')
	    ;

	  tmp[i] = 0;

	  if (i)
	    vlib_unix_recursive_mkdir ((char *) tmp);
	  vec_free (tmp);
	}

      s->flags = CLIB_SOCKET_F_IS_SERVER |	/* listen, don't connect */
	CLIB_SOCKET_F_ALLOW_GROUP_WRITE;	/* PF_LOCAL socket only */
      error = clib_socket_init (s);

      if (error)
	return error;

      template.read_function = unix_cli_listen_read_ready;
      template.file_descriptor = s->fd;
      template.description = format (0, "cli listener %s", s->config);

      clib_file_add (fm, &template);
    }

  /* Set CLI prompt. */
  if (!cm->cli_prompt)
    cm->cli_prompt = format (0, "VLIB: ");

  return 0;
}

/*?
 * This module has no configurable parameters.
?*/
VLIB_CONFIG_FUNCTION (unix_cli_config, "unix-cli");

/** Called when VPP is shutting down, this restores the system
 * terminal state if previously saved.
 */
static clib_error_t *
unix_cli_exit (vlib_main_t * vm)
{
  unix_main_t *um = &unix_main;

  /* If stdin is a tty and we saved the tty state, reset the tty state */
  if (isatty (STDIN_FILENO) && um->tio_isset)
    tcsetattr (STDIN_FILENO, TCSAFLUSH, &um->tio_stdin);

  return 0;
}

VLIB_MAIN_LOOP_EXIT_FUNCTION (unix_cli_exit);

/** Set the CLI prompt.
 * @param prompt The C string to set the prompt to.
 * @note This setting is global; it impacts all current
 *       and future CLI sessions.
 */
void
vlib_unix_cli_set_prompt (char *prompt)
{
  char *fmt = (prompt[strlen (prompt) - 1] == ' ') ? "%s" : "%s ";
  unix_cli_main_t *cm = &unix_cli_main;
  if (cm->cli_prompt)
    vec_free (cm->cli_prompt);
  cm->cli_prompt = format (0, fmt, prompt);
}

/** CLI command to quit the terminal session.
 * @note If this is a stdin session then this will
 *       shutdown VPP also.
 */
static clib_error_t *
unix_cli_quit (vlib_main_t * vm,
	       unformat_input_t * input, vlib_cli_command_t * cmd)
{
  unix_cli_main_t *cm = &unix_cli_main;
  unix_cli_file_t *cf = pool_elt_at_index (cm->cli_file_pool,
					   cm->current_input_file_index);

  /* Cosmetic: suppress the final prompt from appearing before we die */
  cf->is_interactive = 0;
  cf->started = 1;

  vlib_process_signal_event (vm,
			     vlib_current_process (vm),
			     UNIX_CLI_PROCESS_EVENT_QUIT,
			     cm->current_input_file_index);
  return 0;
}

/*?
 * Terminates the current CLI session.
 *
 * If VPP is running in @em interactive mode and this is the console session
 * (that is, the session on @c stdin) then this will also terminate VPP.
?*/
/* *INDENT-OFF* */
VLIB_CLI_COMMAND (unix_cli_quit_command, static) = {
  .path = "quit",
  .short_help = "Exit CLI",
  .function = unix_cli_quit,
};
/* *INDENT-ON* */

/* *INDENT-OFF* */
VLIB_CLI_COMMAND (unix_cli_q_command, static) = {
  .path = "q",
  .short_help = "Exit CLI",
  .function = unix_cli_quit,
};
/* *INDENT-ON* */

/** CLI command to execute a VPP command script. */
static clib_error_t *
unix_cli_exec (vlib_main_t * vm,
	       unformat_input_t * input, vlib_cli_command_t * cmd)
{
  char *file_name;
  int fd;
  unformat_input_t sub_input;
  clib_error_t *error;

  file_name = 0;
  fd = -1;
  error = 0;

  if (!unformat (input, "%s", &file_name))
    {
      error = clib_error_return (0, "expecting file name, got `%U'",
				 format_unformat_error, input);
      goto done;
    }

  fd = open (file_name, O_RDONLY);
  if (fd < 0)
    {
      error = clib_error_return_unix (0, "failed to open `%s'", file_name);
      goto done;
    }

  /* Make sure its a regular file. */
  {
    struct stat s;

    if (fstat (fd, &s) < 0)
      {
	error = clib_error_return_unix (0, "failed to stat `%s'", file_name);
	goto done;
      }

    if (!(S_ISREG (s.st_mode) || S_ISLNK (s.st_mode)))
      {
	error = clib_error_return (0, "not a regular file `%s'", file_name);
	goto done;
      }
  }

  unformat_init_clib_file (&sub_input, fd);

  vlib_cli_input (vm, &sub_input, 0, 0);
  unformat_free (&sub_input);

done:
  if (fd > 0)
    close (fd);
  vec_free (file_name);

  return error;
}

/*?
 * Executes a sequence of CLI commands which are read from a file. If
 * a command is unrecognised or otherwise invalid then the usual CLI
 * feedback will be generated, however execution of subsequent commands
 * from the file will continue.
 *
 * The VPP code is indifferent to the file location. However, if SELinux
 * is enabled, then the file needs to have an SELinux label the VPP
 * process is allowed to access. For example, if a file is created in
 * '<em>/usr/share/vpp/</em>', it will be allowed. However, files manually
 * created in '/tmp/' or '/home/<user>/' will not be accessible by the VPP
 * process when SELinux is enabled.
 *
 * @cliexpar
 * Sample file:
 * @clistart
 * <b><em>$ cat /usr/share/vpp/scripts/gigup.txt</em></b>
 * set interface state GigabitEthernet0/8/0 up
 * set interface state GigabitEthernet0/9/0 up
 * @cliend
 * Example of how to execute a set of CLI commands from a file:
 * @cliexcmd{exec /usr/share/vpp/scripts/gigup.txt}
?*/
/* *INDENT-OFF* */
VLIB_CLI_COMMAND (cli_exec, static) = {
  .path = "exec",
  .short_help = "exec <filename>",
  .function = unix_cli_exec,
  .is_mp_safe = 1,
};
/* *INDENT-ON* */

/** CLI command to show various unix error statistics. */
static clib_error_t *
unix_show_errors (vlib_main_t * vm,
		  unformat_input_t * input, vlib_cli_command_t * cmd)
{
  unix_main_t *um = &unix_main;
  clib_error_t *error = 0;
  int i, n_errors_to_show;
  unix_error_history_t *unix_errors = 0;

  n_errors_to_show = 1 << 30;

  if (unformat_check_input (input) != UNFORMAT_END_OF_INPUT)
    {
      if (!unformat (input, "%d", &n_errors_to_show))
	{
	  error =
	    clib_error_return (0,
			       "expecting integer number of errors to show, got `%U'",
			       format_unformat_error, input);
	  goto done;
	}
    }

  n_errors_to_show =
    clib_min (ARRAY_LEN (um->error_history), n_errors_to_show);

  i =
    um->error_history_index >
    0 ? um->error_history_index - 1 : ARRAY_LEN (um->error_history) - 1;

  while (n_errors_to_show > 0)
    {
      unix_error_history_t *eh = um->error_history + i;

      if (!eh->error)
	break;

      vec_add1 (unix_errors, eh[0]);
      n_errors_to_show -= 1;
      if (i == 0)
	i = ARRAY_LEN (um->error_history) - 1;
      else
	i--;
    }

  if (vec_len (unix_errors) == 0)
    vlib_cli_output (vm, "no Unix errors so far");
  else
    {
      vlib_cli_output (vm, "%Ld total errors seen", um->n_total_errors);
      for (i = vec_len (unix_errors) - 1; i >= 0; i--)
	{
	  unix_error_history_t *eh = vec_elt_at_index (unix_errors, i);
	  vlib_cli_output (vm, "%U: %U",
			   format_time_interval, "h:m:s:u", eh->time,
			   format_clib_error, eh->error);
	}
      vlib_cli_output (vm, "%U: time now",
		       format_time_interval, "h:m:s:u", vlib_time_now (vm));
    }

done:
  vec_free (unix_errors);
  return error;
}

/* *INDENT-OFF* */
VLIB_CLI_COMMAND (cli_unix_show_errors, static) = {
  .path = "show unix errors",
  .short_help = "Show Unix system call error history",
  .function = unix_show_errors,
};
/* *INDENT-ON* */

/** CLI command to show various unix error statistics. */
static clib_error_t *
unix_show_files (vlib_main_t * vm,
		 unformat_input_t * input, vlib_cli_command_t * cmd)
{
  clib_error_t *error = 0;
  clib_file_main_t *fm = &file_main;
  clib_file_t *f;
  char path[PATH_MAX];
  u8 *s = 0;

  vlib_cli_output (vm, "%3s %6s %12s %12s %12s %-32s %s", "FD", "Thread",
		   "Read", "Write", "Error", "File Name", "Description");

  /* *INDENT-OFF* */
  pool_foreach (f, fm->file_pool,(
   {
      int rv;
      s = format (s, "/proc/self/fd/%d%c", f->file_descriptor, 0);
      rv = readlink((char *) s, path, PATH_MAX - 1);

      path[rv < 0 ? 0 : rv] = 0;

      vlib_cli_output (vm, "%3d %6d %12d %12d %12d %-32s %v",
		       f->file_descriptor, f->polling_thread_index,
		       f->read_events, f->write_events, f->error_events,
		       path, f->description);
      vec_reset_length (s);
    }));
  /* *INDENT-ON* */
  vec_free (s);

  return error;
}

/* *INDENT-OFF* */
VLIB_CLI_COMMAND (cli_unix_show_files, static) = {
  .path = "show unix files",
  .short_help = "Show Unix files in use",
  .function = unix_show_files,
};
/* *INDENT-ON* */

/** CLI command to show session command history. */
static clib_error_t *
unix_cli_show_history (vlib_main_t * vm,
		       unformat_input_t * input, vlib_cli_command_t * cmd)
{
  unix_cli_main_t *cm = &unix_cli_main;
  unix_cli_file_t *cf;
  int i, j;

  cf = pool_elt_at_index (cm->cli_file_pool, cm->current_input_file_index);

  if (!cf->is_interactive)
    return clib_error_return (0, "invalid for non-interactive sessions");

  if (cf->has_history && cf->history_limit)
    {
      i = 1 + cf->command_number - vec_len (cf->command_history);
      for (j = 0; j < vec_len (cf->command_history); j++)
	vlib_cli_output (vm, "%d  %v\n", i + j, cf->command_history[j]);
    }
  else
    {
      vlib_cli_output (vm, "History not enabled.\n");
    }

  return 0;
}

/*?
 * Displays the command history for the current session, if any.
?*/
/* *INDENT-OFF* */
VLIB_CLI_COMMAND (cli_unix_cli_show_history, static) = {
  .path = "history",
  .short_help = "Show current session command history",
  .function = unix_cli_show_history,
};
/* *INDENT-ON* */

/** CLI command to show terminal status. */
static clib_error_t *
unix_cli_show_terminal (vlib_main_t * vm,
			unformat_input_t * input, vlib_cli_command_t * cmd)
{
  unix_main_t *um = &unix_main;
  unix_cli_main_t *cm = &unix_cli_main;
  unix_cli_file_t *cf;
  vlib_node_t *n;

  cf = pool_elt_at_index (cm->cli_file_pool, cm->current_input_file_index);
  n = vlib_get_node (vm, cf->process_node_index);

  vlib_cli_output (vm, "Terminal name:   %v\n", n->name);
  vlib_cli_output (vm, "Terminal mode:   %s\n", cf->line_mode ?
		   "line-by-line" : "char-by-char");
  vlib_cli_output (vm, "Terminal width:  %d\n", cf->width);
  vlib_cli_output (vm, "Terminal height: %d\n", cf->height);
  vlib_cli_output (vm, "ANSI capable:    %s\n",
		   cf->ansi_capable ? "yes" : "no");
  vlib_cli_output (vm, "Interactive:     %s\n",
		   cf->is_interactive ? "yes" : "no");
  vlib_cli_output (vm, "History enabled: %s%s\n",
		   cf->has_history ? "yes" : "no", !cf->has_history
		   || cf->history_limit ? "" :
		   " (disabled by history limit)");
  if (cf->has_history)
    vlib_cli_output (vm, "History limit:   %d\n", cf->history_limit);
  vlib_cli_output (vm, "Pager enabled:   %s%s%s\n",
		   cf->no_pager ? "no" : "yes",
		   cf->no_pager
		   || cf->height ? "" : " (disabled by terminal height)",
		   cf->no_pager
		   || um->cli_pager_buffer_limit ? "" :
		   " (disabled by buffer limit)");
  if (!cf->no_pager)
    vlib_cli_output (vm, "Pager limit:     %d\n", um->cli_pager_buffer_limit);
  vlib_cli_output (vm, "CRLF mode:       %s\n",
		   cf->crlf_mode ? "CR+LF" : "LF");

  return 0;
}

/*?
 * Displays various information about the state of the current terminal
 * session.
 *
 * @cliexpar
 * @cliexstart{show terminal}
 * Terminal name:   unix-cli-stdin
 * Terminal mode:   char-by-char
 * Terminal width:  123
 * Terminal height: 48
 * ANSI capable:    yes
 * Interactive:     yes
 * History enabled: yes
 * History limit:   50
 * Pager enabled:   yes
 * Pager limit:     100000
 * CRLF mode:       LF
 * @cliexend
?*/
/* *INDENT-OFF* */
VLIB_CLI_COMMAND (cli_unix_cli_show_terminal, static) = {
  .path = "show terminal",
  .short_help = "Show current session terminal settings",
  .function = unix_cli_show_terminal,
};
/* *INDENT-ON* */

/** CLI command to display a list of CLI sessions. */
static clib_error_t *
unix_cli_show_cli_sessions (vlib_main_t * vm,
			    unformat_input_t * input,
			    vlib_cli_command_t * cmd)
{
  unix_cli_main_t *cm = &unix_cli_main;
  clib_file_main_t *fm = &file_main;
  unix_cli_file_t *cf;
  clib_file_t *uf;
  vlib_node_t *n;

  vlib_cli_output (vm, "%-5s %-5s %-20s %s", "PNI", "FD", "Name", "Flags");

#define fl(x, y) ( (x) ? toupper((y)) : tolower((y)) )
  /* *INDENT-OFF* */
  pool_foreach (cf, cm->cli_file_pool, ({
    uf = pool_elt_at_index (fm->file_pool, cf->clib_file_index);
    n = vlib_get_node (vm, cf->process_node_index);
    vlib_cli_output (vm,
		     "%-5d %-5d %-20v %c%c%c%c%c\n",
		     cf->process_node_index,
		     uf->file_descriptor,
		     n->name,
		     fl (cf->is_interactive, 'i'),
		     fl (cf->is_socket, 's'),
		     fl (cf->line_mode, 'l'),
		     fl (cf->has_epipe, 'p'),
		     fl (cf->ansi_capable, 'a'));
  }));
  /* *INDENT-ON* */
#undef fl

  return 0;
}

/*?
 * Displays a summary of all the current CLI sessions.
 *
 * Typically used to diagnose connection issues with the CLI
 * socket.
 *
 * @cliexpar
 * @cliexstart{show cli-sessions}
 * PNI   FD    Name                 Flags
 * 343   0     unix-cli-stdin       IslpA
 * 344   7     unix-cli-local:20    ISlpA
 * 346   8     unix-cli-local:21    iSLpa
 * @cliexend

 * In this example we have the debug console of the running process
 * on stdin/out, we have an interactive socket session and we also
 * have a non-interactive socket session.
 *
 * Fields:
 *
 * - @em PNI: Process node index.
 * - @em FD: Unix file descriptor.
 * - @em Name: Name of the session.
 * - @em Flags: Various flags that describe the state of the session.
 *
 * @em Flags have the following meanings; lower-case typically negates
 * upper-case:
 *
 * - @em I Interactive session.
 * - @em S Connected by socket.
 * - @em s Not a socket, likely stdin.
 * - @em L Line-by-line mode.
 * - @em l Char-by-char mode.
 * - @em P EPIPE detected on connection; it will close soon.
 * - @em A ANSI-capable terminal.
?*/
/* *INDENT-OFF* */
VLIB_CLI_COMMAND (cli_unix_cli_show_cli_sessions, static) = {
  .path = "show cli-sessions",
  .short_help = "Show current CLI sessions",
  .function = unix_cli_show_cli_sessions,
};
/* *INDENT-ON* */

/** CLI command to set terminal pager settings. */
static clib_error_t *
unix_cli_set_terminal_pager (vlib_main_t * vm,
			     unformat_input_t * input,
			     vlib_cli_command_t * cmd)
{
  unix_main_t *um = &unix_main;
  unix_cli_main_t *cm = &unix_cli_main;
  unix_cli_file_t *cf;
  unformat_input_t _line_input, *line_input = &_line_input;
  clib_error_t *error = 0;

  cf = pool_elt_at_index (cm->cli_file_pool, cm->current_input_file_index);

  if (!cf->is_interactive)
    return clib_error_return (0, "invalid for non-interactive sessions");

  if (!unformat_user (input, unformat_line_input, line_input))
    return 0;

  while (unformat_check_input (line_input) != UNFORMAT_END_OF_INPUT)
    {
      if (unformat (line_input, "on"))
	cf->no_pager = 0;
      else if (unformat (line_input, "off"))
	cf->no_pager = 1;
      else if (unformat (line_input, "limit %u", &um->cli_pager_buffer_limit))
	vlib_cli_output (vm,
			 "Pager limit set to %u lines; note, this is global.\n",
			 um->cli_pager_buffer_limit);
      else
	{
	  error = clib_error_return (0, "unknown parameter: `%U`",
				     format_unformat_error, line_input);
	  goto done;
	}
    }

done:
  unformat_free (line_input);

  return error;
}

/*?
 * Enables or disables the terminal pager for this session. Generally
 * this defaults to enabled.
 *
 * Additionally allows the pager buffer size to be set; though note that
 * this value is set globally and not per session.
?*/
/* *INDENT-OFF* */
VLIB_CLI_COMMAND (cli_unix_cli_set_terminal_pager, static) = {
  .path = "set terminal pager",
  .short_help = "set terminal pager [on|off] [limit <lines>]",
  .function = unix_cli_set_terminal_pager,
};
/* *INDENT-ON* */

/** CLI command to set terminal history settings. */
static clib_error_t *
unix_cli_set_terminal_history (vlib_main_t * vm,
			       unformat_input_t * input,
			       vlib_cli_command_t * cmd)
{
  unix_cli_main_t *cm = &unix_cli_main;
  unix_cli_file_t *cf;
  unformat_input_t _line_input, *line_input = &_line_input;
  u32 limit;
  clib_error_t *error = 0;

  cf = pool_elt_at_index (cm->cli_file_pool, cm->current_input_file_index);

  if (!cf->is_interactive)
    return clib_error_return (0, "invalid for non-interactive sessions");

  if (!unformat_user (input, unformat_line_input, line_input))
    return 0;

  while (unformat_check_input (line_input) != UNFORMAT_END_OF_INPUT)
    {
      if (unformat (line_input, "on"))
	cf->has_history = 1;
      else if (unformat (line_input, "off"))
	cf->has_history = 0;
      else if (unformat (line_input, "limit %u", &cf->history_limit))
	;
      else
	{
	  error = clib_error_return (0, "unknown parameter: `%U`",
				     format_unformat_error, line_input);
	  goto done;
	}

    }

  /* If we reduced history size, or turned it off, purge the history */
  limit = cf->has_history ? cf->history_limit : 0;
  if (limit < vec_len (cf->command_history))
    {
      u32 i;

      /* How many items to remove from the start of history */
      limit = vec_len (cf->command_history) - limit;

      for (i = 0; i < limit; i++)
	vec_free (cf->command_history[i]);

      vec_delete (cf->command_history, limit, 0);
    }

done:
  unformat_free (line_input);

  return error;
}

/*?
 * Enables or disables the command history function of the current
 * terminal. Generally this defaults to enabled.
 *
 * This command also allows the maximum size of the history buffer for
 * this session to be altered.
?*/
/* *INDENT-OFF* */
VLIB_CLI_COMMAND (cli_unix_cli_set_terminal_history, static) = {
  .path = "set terminal history",
  .short_help = "set terminal history [on|off] [limit <lines>]",
  .function = unix_cli_set_terminal_history,
};
/* *INDENT-ON* */

/** CLI command to set terminal ANSI settings. */
static clib_error_t *
unix_cli_set_terminal_ansi (vlib_main_t * vm,
			    unformat_input_t * input,
			    vlib_cli_command_t * cmd)
{
  unix_cli_main_t *cm = &unix_cli_main;
  unix_cli_file_t *cf;

  cf = pool_elt_at_index (cm->cli_file_pool, cm->current_input_file_index);

  if (!cf->is_interactive)
    return clib_error_return (0, "invalid for non-interactive sessions");

  if (unformat (input, "on"))
    cf->ansi_capable = 1;
  else if (unformat (input, "off"))
    cf->ansi_capable = 0;
  else
    return clib_error_return (0, "unknown parameter: `%U`",
			      format_unformat_error, input);

  return 0;
}

/*?
 * Enables or disables the use of ANSI control sequences by this terminal.
 * The default will vary based on terminal detection at the start of the
 * session.
 *
 * ANSI control sequences are used in a small number of places to provide,
 * for example, color text output and to control the cursor in the pager.
?*/
/* *INDENT-OFF* */
VLIB_CLI_COMMAND (cli_unix_cli_set_terminal_ansi, static) = {
  .path = "set terminal ansi",
  .short_help = "set terminal ansi [on|off]",
  .function = unix_cli_set_terminal_ansi,
};
/* *INDENT-ON* */

static clib_error_t *
unix_cli_init (vlib_main_t * vm)
{
  unix_cli_main_t *cm = &unix_cli_main;

  /* Breadcrumb to indicate the new session process
   * has not been started */
  cm->new_session_process_node_index = ~0;

  return 0;
}

VLIB_INIT_FUNCTION (unix_cli_init);

/*
 * fd.io coding-style-patch-verification: ON
 *
 * Local Variables:
 * eval: (c-set-style "gnu")
 * End:
 */