aboutsummaryrefslogtreecommitdiffstats
path: root/hicn-light/src/hicn/core/listener.c
blob: d24fafba097ed95c73414897653e79041be2fd5a (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
/*
 * Copyright (c) 2017-2020 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.
 */

/**
 * @file listener.c
 * @brief Implementation of hICN listeners
 */


#include <string.h> // strdup

#include <hicn/util/log.h>

#include "forwarder.h"
#include "listener_vft.h"
#include "../base/loop.h"
#include "../io/base.h"

listener_t *
listener_create(face_type_t type, const address_t * address,
        const char * interface_name, const char * name, forwarder_t * forwarder)
{
    const listener_table_t * table = forwarder_get_listener_table(forwarder);

    listener_t * listener;
    listener_key_t key = {
        .type = type,
        .address = *address,
    };
    listener_table_allocate(table, listener, &key, name);

    unsigned listener_id = listener_table_get_listener_id(table, listener);

    listener_initialize(listener, type, name, listener_id, address, interface_name, forwarder);
    return listener;
}

int
listener_initialize(listener_t * listener, face_type_t type, const char * name,
        unsigned listener_id, const address_t * address,
        const char * interface_name, forwarder_t * forwarder)
{
    int rc;

    assert(listener);
    assert(forwarder);

    *listener = (listener_t) {
        .id = listener_id,
        .name = strdup(name),
        .type = type,
        .interface_name = strdup(interface_name),
        //.interface_index = ,
        //.family = ,
        .fd = 0,
        .address = *address,
        .forwarder = forwarder,
    };

    listener->data = malloc(listener_vft[listener->type]->data_size);
    if (!listener->data)
        goto ERR_DATA;

    assert(listener_has_valid_type(listener));

    rc = listener_vft[listener->type]->initialize(listener);
    if (rc < 0)
        goto ERR_VFT;

    listener->fd = listener_vft[listener->type]->get_socket(listener, address, NULL, interface_name);
    if (listener->fd < 0) {
        ERROR("Error creating listener fd: (%d) %s", errno, strerror(errno));
        goto ERR_FD;
    }
    assert(listener->fd > 0);

    // XXX data should be pre-allocated here

    loop_fd_event_create(&listener->event_data, MAIN_LOOP, listener->fd, listener,
                (fd_callback_t)listener_read_callback, NULL);

    if (!listener->event_data) {
        goto ERR_REGISTER_FD;
    }

    if (loop_fd_event_register(listener->event_data) < 0) {
        goto ERR_REGISTER_FD;
    }

    // XXX TODO
    //char *str = addressToString(listener->local_addr);
    DEBUG("%s UdpListener %p created for address %s",
            face_type_str(listener->type), listener, "N/A");
    //free(str);

    return 0;

ERR_REGISTER_FD:
#ifndef _WIN32
    close(listener->fd);
#else
    closesocket(listener->fd);
#endif
ERR_FD:
ERR_VFT:
    free(listener->data);
ERR_DATA:
    free(listener->interface_name);
    free(listener->name);
    return -1;
}

int
listener_finalize(listener_t * listener)
{
    assert(listener);
    assert(listener_has_valid_type(listener));

    loop_event_unregister(listener->event_data);

#ifndef _WIN32
    close(listener->fd);
#else
    closesocket(listener->fd);
#endif

    listener_vft[listener->type]->finalize(listener);

    free(listener->data);
    free(listener->interface_name);
    free(listener->name);
    loop_event_free(listener->event_data);

    return 0;
}

int listener_get_socket(const listener_t * listener, const address_t * local,
        const address_t * remote, const char * interface_name)
{
    assert(listener);
    assert(listener_has_valid_type(listener));
    assert(local);
    assert(remote);

    return listener_vft[listener->type]->get_socket(listener, local, remote,
            interface_name);
}

// XXX CHANGE : we now get the fd directly from the listener
unsigned listener_create_connection(const listener_t * listener,
        const address_pair_t * pair)
{
    assert(listener);
    assert(listener_has_valid_type(listener));
    assert(pair);

    // XXX TODO This code is likely common with connection creation code
    const char * name = NULL;

    connection_table_t * table = forwarder_get_connection_table(listener->forwarder);
    connection_t * connection;
    connection_table_allocate(table, connection, pair, name);

    unsigned connid = connection_table_get_connection_id(table, connection);

    bool local = address_is_local(address_pair_get_local(pair));

    int fd = listener_get_socket(listener, address_pair_get_local(pair),
            address_pair_get_remote(pair), NULL); // XXX interfacename was not specified

    // XXX here we use the same interface name as the listener
    int rc = connection_initialize(connection, listener->type, name,
            listener->interface_name, fd, pair, local, connid, listener->forwarder);
    if (rc < 0)
        return ~0; // XXX how to return an error

    // This was already commented:
    // connection_AllowWldrAutoStart(*conn_ptr);

    return connid;
}

int
listener_punt(const listener_t * listener, const char * prefix_s)
{
    assert(listener);
    assert(listener_get_type(listener) == FACE_TYPE_HICN);
    assert(prefix_s);

    return listener_vft[listener_get_type(listener)]->punt(listener, prefix_s);
}


ssize_t
listener_read_single(listener_t * listener)
{
    assert(listener);

    size_t processed_size;
    size_t total_size = 0;

    msgbuf_pool_t * msgbuf_pool = forwarder_get_msgbuf_pool(listener->forwarder);

    for (;;) {

        msgbuf_t * msgbuf = NULL;
        off_t msgbuf_id = msgbuf_pool_get(msgbuf_pool, msgbuf);
        if (!msgbuf_id_is_valid(msgbuf_id))
            return 0;

        address_pair_t pair;
        pair.local = *listener_get_address(listener);

        ssize_t n = listener_vft[listener->type]->read_single(listener->fd, msgbuf,
                address_pair_get_remote(&pair));
        if (n < 1)
            return 0;

        /* Process received packet */
        processed_size = forwarder_receive(listener->forwarder, listener,
                msgbuf_id, &pair, ticks_now());
        if (processed_size <= 0)
            break;

        total_size += processed_size;
    }

    /*
     * Even through the current listener does not allow batching, the connection
     * on which we went packets might do batching (even without sendmmsg), and
     * we need to inform the system that we want to proceed to sending packets.
     */
    forwarder_flush_connections(listener->forwarder);
    return total_size;

}

ssize_t
listener_read_batch(listener_t * listener)
{
    assert(listener);

    size_t processed_size;
    size_t total_size = 0;

    forwarder_t * forwarder = listener->forwarder;
    msgbuf_pool_t * msgbuf_pool = forwarder_get_msgbuf_pool(forwarder);
    /* Receive messages in the loop as long as we manage to fill the buffers */
    int r = 0;
    do {
        /* Prepare the msgbuf and address pair arrays */
        msgbuf_t * msgbuf[MAX_MSG];
        if (!msgbuf_pool_getn(msgbuf_pool, msgbuf, MAX_MSG))
            break;

        address_pair_t pair[MAX_MSG];
        address_t * address_remote[MAX_MSG];
        for (unsigned i = 0; i < MAX_MSG; i++)
            address_remote[i] = address_pair_get_remote(&pair[i]);

        ssize_t n = listener_vft[listener->type]->read_batch(listener->fd,
                msgbuf, address_remote, MAX_MSG);
        // XXX error check

        for (unsigned i = 0; i < n; i++) {
            processed_size = forwarder_receive(forwarder, listener,
                    msgbuf_pool_get_id(msgbuf_pool, msgbuf[i]),
                    &pair[i], ticks_now());
            if (processed_size <= 0)
                break;

            total_size += processed_size;
        }

    } while(r == MAX_MSG); /* backpressure based on queue size ? */

    /*
     * Signal to the forwarder that we reached the end of a batch and we need to
     * flush connections out
     */
    forwarder_flush_connections(forwarder);

    return total_size;

}

ssize_t
listener_read_callback(listener_t * listener, int fd, void * user_data)
{
    // XXX make a single callback and arbitrate between read and readbatch
    assert(listener);
    assert(fd == listener->fd);

    if (listener_vft[listener->type]->read_batch)
        return listener_read_batch(listener);

    return listener_read_single(listener);
}



#if 0
void
_listener_callback(evutil_socket_t fd, short what, void * arg)
{
    fd_callback_data_t * data = arg;
    data->callback(data->owner, fd, data->data);
}

int
listener_register_fd(listener_t * listener, int fd, fd_callback_t callback, void * data)
{
    fd_callback_data_t callback_data = {
        .fd = fd,
        .owner = listener,
        .callback = callback,
        .data = data,
    };

    return loop_register_fd(MAIN_LOOP, fd, listener, _listener_callback, callback_data);
}

int
listener_unregister_fd(listener_t * listener, int fd)
{
    return loop_unregister_fd(MAIN_LOOP, fd);
}
#endif

void
listener_setup_all(const forwarder_t * forwarder, uint16_t port, const char *localPath)
{
#if 0
    InterfaceSet *set = system_Interfaces(forwarder);

    size_t interfaceSetLen = interfaceSetLength(set);
    for (size_t i = 0; i < interfaceSetLen; i++) {
        Interface *iface = interfaceSetGetByOrdinalIndex(set, i);

        const AddressList *addresses = interfaceGetAddresses(iface);
        size_t addressListLen = addressListLength(addresses);

        for (size_t j = 0; j < addressListLen; j++) {
            const address_t *address = addressListGetItem(addresses, j);

            // Do not start on link address
            char listenerName[SYMBOLIC_NAME_LEN];
#ifdef __ANDROID__
            snprintf(listenerName, SYMBOLIC_NAME_LEN, "local_%zu", i);
#else
            snprintf(listenerName, SYMBOLIC_NAME_LEN, "local_%ld", i);
#endif
            // XXX TODO      if (addressGetType(address) != ADDR_LINK) {
            _setupTcpListener(forwarder, listenerName, address,
                    (char *)interfaceGetName(iface));
            //      }
        }
    }

    interfaceSetDestroy(&set);
#endif
}

// XXX TODO
void
listener_setup_local_ipv4(const forwarder_t * forwarder,  uint16_t port)
{
#if 0
    // XXX memset
    address_t address = ADDRESS4_LOCALHOST(port);

    _setupUdpListener(forwarder, "lo_udp", &address, "lo");
    _setupTcpListener(forwarder, "lo_tcp", &address, "lo");
#endif
}