summaryrefslogtreecommitdiffstats
path: root/lib/src/common.c
blob: 3620349424b975697894896dc5e28f2795627981 (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
/*
 * Copyright (c) 2021 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 common.c
 * @brief Implementation of common interfaces abstracting low-level platform.
 * details.
 */

#include <stdlib.h>
#include <string.h>    // memset
#include <sys/types.h> // getaddrinfo
#ifndef _WIN32
#include <sys/socket.h>
#include <netdb.h>
#endif
#include <stdio.h>

#include <hicn/common.h>
#include <hicn/util/log.h>

int
get_addr_family (const char *ip_address)
{
  struct addrinfo hint, *res = NULL;
  int rc;

  memset (&hint, '\0', sizeof hint);

  hint.ai_family = PF_UNSPEC;
  hint.ai_flags = AI_NUMERICHOST;

  rc = getaddrinfo (ip_address, NULL, &hint, &res);
  if (rc)
    {
      return -1;
    }
  rc = res->ai_family;
  freeaddrinfo (res);
  return rc;
}

/* hashes */

// FNV-1a 32-bit http://www.isthe.com/chongo/tech/comp/fnv/
typedef u_int32_t Fnv32_t;
#define FNV_32_PRIME  ((Fnv32_t) 0x01000193)
#define FNV1_32_INIT  ((Fnv32_t) 0x811c9dc5)
#define FNV1_32A_INIT FNV1_32_INIT

Fnv32_t
cumulative_hash32 (const void *buf, size_t len, Fnv32_t hval)
{
  unsigned char *bp = (unsigned char *) buf; /* start of buffer */
  unsigned char *be = bp + len;		     /* beyond end of buffer */

  /*
   * FNV-1a hash each octet in the buffer
   */
  while (bp < be)
    {

      /* xor the bottom with the current octet */
      hval ^= (Fnv32_t) *bp++;

      /* multiply by the 32 bit FNV magic prime mod 2^32 */
#if defined(NO_FNV_GCC_OPTIMIZATION)
      hval *= FNV_32_PRIME;
#else
      hval +=
	(hval << 1) + (hval << 4) + (hval << 7) + (hval << 8) + (hval << 24);
#endif
    }

  /* return our new hash value */
  return hval;
}

u32
hash32 (const void *data, size_t len)
{
  return cumulative_hash32 (data, len, FNV1_32A_INIT);
}

void
hicn_packet_dump (const uint8_t *buffer, size_t len)
{
  int i;
  unsigned char buff[17];
  unsigned char *pc = (unsigned char *) buffer;

  // Output description if given.
  if (len == 0)
    {
      printf ("  ZERO LENGTH\n");
      return;
    }

  // Process every byte in the data.
  for (i = 0; i < len; i++)
    {
      // Multiple of 16 means new line (with line offset).

      if ((i % 16) == 0)
	{
	  // Just don't print ASCII for the zeroth line.
	  if (i != 0)
	    printf ("  %s\n", buff);

	  // Output the offset.
	  printf ("  %04x ", i);
	}

      // Now the hex code for the specific character.
      printf (" %02x", pc[i]);

      // And store a printable ASCII character for later.
      if ((pc[i] < 0x20) || (pc[i] > 0x7e))
	buff[i % 16] = '.';
      else
	buff[i % 16] = pc[i];
      buff[(i % 16) + 1] = '\0';
    }

  // Pad out last line if not exactly 16 characters.
  while ((i % 16) != 0)
    {
      printf ("   ");
      i++;
    }

  // And print the final ASCII bit.
  printf ("  %s\n", buff);
}

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