FreeCalypso > hg > rtp-debug-utils

annotate pcap-study/rtp-stream-dump.c @ 10:e686bc92c7d8

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revamp for new subdir structure and configure script
author Mychaela Falconia <falcon@freecalypso.org>
date Wed, 15 May 2024 01:44:46 +0000
parents rtp-stream-dump.c@709aa9ad72d1
children d59dbdfe1778
Ignore whitespace changes - Everywhere: Within whitespace: At end of lines:
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1 /*
6
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2 * This program is an aid for analyzing arbitrary RTP streams:
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3 * it reads a pcap file, extracts packets belonging to a particular
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4 * RTP stream as identified by a source or destination IP:port,
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5 * and displays a one-line summary of every RTP packet.
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6 * Discontinuities are treated as non-fatal errors: an error message
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7 * is printed, but analysis continues.
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8 */
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9
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10 #include <sys/types.h>
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11 #include <sys/socket.h>
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12 #include <netinet/in.h>
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13 #include <arpa/inet.h>
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14 #include <stdio.h>
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15 #include <stdlib.h>
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16 #include <string.h>
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17 #include <strings.h>
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18 #include <pcap/pcap.h>
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19
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20 static pcap_t *pcap;
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21 static in_addr_t match_ip_addr;
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22 static u_short match_udp_port;
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23 static unsigned iphdr_addr_offset, udphdr_port_offset;
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24 static unsigned link_hdr_len, ethertype_offset;
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25 static int stream_init_flag;
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26 static unsigned last_seq, last_tstamp, stream_ssrc;
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27
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28 static void
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29 check_dl_type()
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30 {
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31 int dltype;
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32
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33 dltype = pcap_datalink(pcap);
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34 switch (dltype) {
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35 case DLT_EN10MB:
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36 link_hdr_len = 14;
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37 ethertype_offset = 12;
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38 break;
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39 case DLT_RAW:
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40 link_hdr_len = 0;
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41 break;
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42 case DLT_LINUX_SLL:
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43 link_hdr_len = 16;
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44 ethertype_offset = 14;
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45 break;
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46 default:
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47 fprintf(stderr, "error: unsupported data link type %d\n",
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48 dltype);
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49 exit(1);
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50 }
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51 }
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52
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53 static void
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54 rtp_stream_logic(rtp_hdr, pkt_idx)
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55 u_char *rtp_hdr;
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56 unsigned pkt_idx;
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57 {
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58 unsigned cur_seq, cur_tstamp, cur_ssrc;
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59
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60 cur_seq = (rtp_hdr[2] << 8) | rtp_hdr[3];
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61 cur_tstamp = (rtp_hdr[4] << 24) | (rtp_hdr[5] << 16) |
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62 (rtp_hdr[6] << 8) | rtp_hdr[7];
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63 cur_ssrc = (rtp_hdr[8] << 24) | (rtp_hdr[9] << 16) |
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64 (rtp_hdr[10] << 8) | rtp_hdr[11];
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65 if (stream_init_flag) {
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66 if (cur_ssrc != stream_ssrc) {
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67 printf(
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68 "error in packet #%u: SSRC change from 0x%08X to 0x%08X\n",
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69 pkt_idx, stream_ssrc, cur_ssrc);
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70 } else if (cur_seq != last_seq + 1 &&
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71 (cur_seq != 0 || last_seq != 0xFFFF)) {
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72 printf(
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73 "error in packet #%u: seq break from 0x%04X to 0x%04X\n",
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74 pkt_idx, last_seq, cur_seq);
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75 } else if (cur_tstamp != last_tstamp + 160) {
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76 printf(
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77 "error in packet #%u: timestamp break from 0x%08X to 0x%08X\n",
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78 pkt_idx, last_tstamp, cur_tstamp);
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79 }
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80 } else
0
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81 stream_init_flag = 1;
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82 last_seq = cur_seq;
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83 last_tstamp = cur_tstamp;
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84 stream_ssrc = cur_ssrc;
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85 }
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86
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87 static void
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88 process_packet(pkt, caplen, pkt_idx)
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89 u_char *pkt;
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90 unsigned caplen, pkt_idx;
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91 {
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92 unsigned udplen, payload_len;
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93
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94 if (caplen < link_hdr_len + 28)
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95 return;
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96 if (link_hdr_len) {
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97 if (pkt[ethertype_offset] != 0x08)
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98 return;
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99 if (pkt[ethertype_offset+1] != 0x00)
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100 return;
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101 pkt += link_hdr_len;
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102 caplen -= link_hdr_len;
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103 }
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104 /* check IP header */
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105 if (pkt[0] != 0x45)
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106 return;
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107 if (pkt[9] != 17) /* UDP */
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108 return;
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109 if (bcmp(pkt + iphdr_addr_offset, &match_ip_addr, 4))
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110 return;
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111 /* check UDP header */
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112 if (bcmp(pkt + 20 + udphdr_port_offset, &match_udp_port, 2))
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113 return;
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114 /* it is our target - now scrutinize it */
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115 udplen = (pkt[24] << 8) | pkt[25];
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116 if (caplen < udplen + 20) {
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117 fprintf(stderr,
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118 "error: packet #%u is truncated in the capture\n",
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119 pkt_idx);
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120 exit(1);
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121 }
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122 if (udplen < 20) {
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123 fprintf(stderr,
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124 "error in packet #%u: UDP length is too short for RTP header\n",
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125 pkt_idx);
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126 exit(1);
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127 }
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128 if (pkt[28] != 0x80) {
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129 fprintf(stderr,
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130 "error in packet #%u: unsupported RTP header structure\n",
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131 pkt_idx);
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132 exit(1);
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133 }
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134 rtp_stream_logic(pkt + 28, pkt_idx);
6
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135 printf("pkt #%u seq 0x%04X ts 0x%08X: pt=%u M=%u len=%u\n", pkt_idx,
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136 last_seq, last_tstamp, pkt[29] & 0x7F, pkt[29] >> 7,
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137 udplen - 20);
0
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138 }
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139
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140 main(argc, argv)
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141 char **argv;
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142 {
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143 char errbuf[PCAP_ERRBUF_SIZE];
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144 u_char *pkt;
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145 struct pcap_pkthdr pkthdr;
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146 unsigned pkt_idx;
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147
3
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148 if (argc != 5) {
0
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149 fprintf(stderr,
3
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150 "usage: %s pcap-file src|dest ip-addr udp-port\n",
0
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151 argv[0]);
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152 exit(1);
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153 }
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154 pcap = pcap_open_offline(argv[1], errbuf);
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155 if (!pcap) {
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156 fprintf(stderr, "%s: %s\n", argv[1], errbuf);
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157 exit(1);
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158 }
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159 check_dl_type();
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160 if (!strcmp(argv[2], "src")) {
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161 iphdr_addr_offset = 12;
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162 udphdr_port_offset = 0;
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163 } else if (!strcmp(argv[2], "dest")) {
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164 iphdr_addr_offset = 16;
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165 udphdr_port_offset = 2;
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166 } else {
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167 fprintf(stderr,
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168 "error: direction argument must be \"src\" or \"dest\"\n");
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169 exit(1);
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170 }
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171 match_ip_addr = inet_addr(argv[3]);
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172 if (match_ip_addr == INADDR_NONE) {
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173 fprintf(stderr, "error: IP address argument is invalid\n");
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174 exit(1);
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175 }
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176 match_udp_port = htons(strtoul(argv[4], 0, 0));
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177 for (pkt_idx = 0; ; pkt_idx++) {
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178 pkt = pcap_next(pcap, &pkthdr);
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179 if (!pkt)
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180 break;
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181 process_packet(pkt, (unsigned) pkthdr.caplen, pkt_idx);
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182 }
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183 if (!stream_init_flag) {
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184 fprintf(stderr, "error: specified RTP stream not found\n");
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185 exit(1);
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186 }
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187 exit(0);
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188 }