libs/srtp/recv.c

   1 /*
   2  * Secure RTP with libgcrypt
   3  * Copyright (C) 2007  Rémi Denis-Courmont
   4  *
   5  * This library is free software; you can redistribute it and/or
   6  * modify it under the terms of the GNU Lesser General Public
   7  * License as published by the Free Software Foundation; either
   8  * version 2.1 of the License, or (at your option) any later version.
   9  *
  10  * This library is distributed in the hope that it will be useful,
  11  * but WITHOUT ANY WARRANTY; without even the implied warranty of
  12  * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
  13  * Lesser General Public License for more details.
  14  *
  15  * You should have received a copy of the GNU Lesser General Public
  16  * License along with this library; if not, write to the Free Software
  17  * Foundation, Inc., 51 Franklin St, Fifth Floor, Boston, MA  02110-1301  USA
  18  */
  19
  20 #ifdef HAVE_CONFIG_H
  21 # include <config.h>
  22 #endif
  23
  24 #include <stdint.h>
  25 #include <stddef.h>
  26 #include "srtp.h"
  27
  28 #include <stdio.h>
  29 #include <string.h>
  30
  31 #include <unistd.h>
  32 #include <netinet/in.h>
  33
  34 int main (void)
  35 {
  36     int fd = socket (AF_INET, SOCK_DGRAM, 0);
  37     struct sockaddr_in addr;
  38     memset (&addr, 0, sizeof (addr));
  39     addr.sin_family = AF_INET;
  40 #ifdef HAVE_SA_LEN
  41     addr.sin_len = sizeof (addr);
  42 #endif
  43     addr.sin_port = htons (10000);
  44     addr.sin_addr.s_addr = htonl (0x7f000001);
  45     if (bind (fd, (struct sockaddr *)&addr, sizeof (addr)))
  46         return 1;
  47
  48     static const uint8_t key[16] =
  49         "\x12\x34\x56\x78\x9A\xBC\xDE\xF0"
  50         "\x12\x34\x56\x78\x9A\xBC\xDE\xF0";
  51     static const uint8_t salt[14] =
  52         "\x12\x34\x56\x78\x90" "\x12\x34\x56\x78\x90" "\x12\x34\x56\x78";
  53
  54     srtp_session_t *s = srtp_create (SRTP_ENCR_AES_CM, SRTP_AUTH_HMAC_SHA1, 10,
  55                                      SRTP_PRF_AES_CM, 0);
  56     if (s == NULL)
  57         return 1;
  58     if (srtp_setkey (s, key, 16, salt, 14))
  59         goto error;
  60
  61     uint8_t buf[1500];
  62     size_t len;
  63 #if 0
  64     memset (buf, 0, sizeof (buf));
  65     buf[0] = 2 << 6;
  66     buf[1] = 1;
  67     memcpy (buf + 2, &(uint16_t){ htons (9527) }, 2);
  68     memcpy (buf + 8, "\xde\xad\xbe\xef", 4);
  69     memcpy (buf + 4, &(uint32_t){ htonl (1) }, 4);
  70     strcpy ((char *)buf + 12, "a\n");
  71     len = 12 + strlen ((char *)buf + 12) + 1;
  72 #endif
  73     for (;;)
  74     {
  75         len = read (fd, buf, sizeof (buf));
  76         int val = srtp_recv (s, buf, &len);
  77         if (val)
  78         {
  79             fprintf (stderr, "Cannot decrypt: %s\n", strerror (val));
  80             continue;
  81         }
  82
  83         puts ((char *)buf + 12);
  84         //if (srtp_send (s, buf, &len, sizeof (buf)) || srtp_recv (s, buf, &len))
  85         //    break;
  86         puts ((char *)buf + 12);
  87     }
  88
  89 error:
  90     srtp_destroy (s);
  91     close (fd);
  92     return 0;
  93 }