FreeCalypso > hg > rtp-debug-utils

annotate pcap-study/rtp-g711-extr.c @ 17:ab18adf989e3 default tip

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pcm-study: new program pcm16-frag-extr
author Mychaela Falconia <falcon@freecalypso.org>
date Tue, 29 Oct 2024 00:32:33 +0000
parents e686bc92c7d8
children
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1 /*
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2 * This program reads a pcap file, extracts packets belonging to a
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3 * particular RTP stream as identified by a source or destination
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4 * IP:port, and verifies that an unbroken RTP stream is present,
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5 * with 160-byte payloads corresponding to timestamp increments
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6 * of 160 units per packet, as expected for a G.711 (PCMU or PCMA)
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7 * RTP stream with 20 ms packetization. The extracted G.711 stream
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8 * is written to a raw binary file.
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9 */
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10
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11 #include <sys/types.h>
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12 #include <sys/socket.h>
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13 #include <netinet/in.h>
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14 #include <arpa/inet.h>
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15 #include <stdio.h>
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16 #include <stdlib.h>
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17 #include <string.h>
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18 #include <strings.h>
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19 #include <pcap/pcap.h>
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20
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21 static pcap_t *pcap;
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22 static in_addr_t match_ip_addr;
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23 static u_short match_udp_port;
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24 static unsigned iphdr_addr_offset, udphdr_port_offset;
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25 static unsigned link_hdr_len, ethertype_offset;
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26 static FILE *outfile;
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27 static int stream_init_flag;
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28 static unsigned last_seq, last_tstamp, stream_ssrc;
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29
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30 static void
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31 check_dl_type()
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32 {
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33 int dltype;
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34
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35 dltype = pcap_datalink(pcap);
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36 switch (dltype) {
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37 case DLT_EN10MB:
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38 link_hdr_len = 14;
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39 ethertype_offset = 12;
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40 break;
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41 case DLT_RAW:
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42 link_hdr_len = 0;
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43 break;
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44 case DLT_LINUX_SLL:
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45 link_hdr_len = 16;
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46 ethertype_offset = 14;
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47 break;
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48 default:
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49 fprintf(stderr, "error: unsupported data link type %d\n",
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50 dltype);
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51 exit(1);
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52 }
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53 }
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54
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55 static void
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56 rtp_stream_logic(rtp_hdr, pkt_idx)
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57 u_char *rtp_hdr;
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58 unsigned pkt_idx;
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59 {
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60 unsigned cur_seq, cur_tstamp, cur_ssrc;
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61
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62 cur_seq = (rtp_hdr[2] << 8) | rtp_hdr[3];
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63 cur_tstamp = (rtp_hdr[4] << 24) | (rtp_hdr[5] << 16) |
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64 (rtp_hdr[6] << 8) | rtp_hdr[7];
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65 cur_ssrc = (rtp_hdr[8] << 24) | (rtp_hdr[9] << 16) |
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66 (rtp_hdr[10] << 8) | rtp_hdr[11];
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67 if (stream_init_flag) {
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68 if (cur_ssrc != stream_ssrc) {
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69 fprintf(stderr,
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70 "error in packet #%u: SSRC change from 0x%08X to 0x%08X\n",
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71 pkt_idx, stream_ssrc, cur_ssrc);
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72 exit(1);
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73 }
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74 if (cur_seq != last_seq + 1 &&
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75 (cur_seq != 0 || last_seq != 0xFFFF)) {
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76 fprintf(stderr,
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77 "error in packet #%u: seq break from 0x%04X to 0x%04X\n",
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78 pkt_idx, last_seq, cur_seq);
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79 exit(1);
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80 }
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81 if (cur_tstamp != last_tstamp + 160) {
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82 fprintf(stderr,
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83 "error in packet #%u: timestamp break from 0x%08X to 0x%08X\n",
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84 pkt_idx, last_tstamp, cur_tstamp);
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85 exit(1);
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86 }
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87 } else {
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88 stream_init_flag = 1;
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89 stream_ssrc = cur_ssrc;
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90 }
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91 last_seq = cur_seq;
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92 last_tstamp = cur_tstamp;
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93 }
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94
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95 static void
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96 process_packet(pkt, caplen, pkt_idx)
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97 u_char *pkt;
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98 unsigned caplen, pkt_idx;
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99 {
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100 unsigned udplen, payload_len;
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101
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102 if (caplen < link_hdr_len + 28)
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103 return;
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104 if (link_hdr_len) {
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105 if (pkt[ethertype_offset] != 0x08)
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106 return;
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107 if (pkt[ethertype_offset+1] != 0x00)
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108 return;
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109 pkt += link_hdr_len;
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110 caplen -= link_hdr_len;
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111 }
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112 /* check IP header */
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113 if (pkt[0] != 0x45)
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114 return;
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115 if (pkt[9] != 17) /* UDP */
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116 return;
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117 if (bcmp(pkt + iphdr_addr_offset, &match_ip_addr, 4))
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118 return;
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119 /* check UDP header */
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120 if (bcmp(pkt + 20 + udphdr_port_offset, &match_udp_port, 2))
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121 return;
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122 /* it is our target - now scrutinize it */
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123 udplen = (pkt[24] << 8) | pkt[25];
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124 if (caplen < udplen + 20) {
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125 fprintf(stderr,
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126 "error: packet #%u is truncated in the capture\n",
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127 pkt_idx);
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128 exit(1);
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129 }
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130 if (udplen < 20) {
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131 fprintf(stderr,
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132 "error in packet #%u: UDP length is too short for RTP header\n",
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133 pkt_idx);
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134 exit(1);
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135 }
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136 if (pkt[28] != 0x80) {
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137 fprintf(stderr,
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138 "error in packet #%u: unsupported RTP header structure\n",
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139 pkt_idx);
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140 exit(1);
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141 }
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142 rtp_stream_logic(pkt + 28, pkt_idx);
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143 payload_len = udplen - 20;
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144 if (payload_len != 160) {
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145 fprintf(stderr, "error in packet #%u: unsupported payload\n",
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146 pkt_idx);
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147 exit(1);
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148 }
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149 fwrite(pkt + 40, 1, payload_len, outfile);
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150 }
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151
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152 main(argc, argv)
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153 char **argv;
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154 {
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155 char errbuf[PCAP_ERRBUF_SIZE];
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156 u_char *pkt;
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157 struct pcap_pkthdr pkthdr;
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158 unsigned pkt_idx, skip_num;
0
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159
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160 if (argc < 6 || argc > 7) {
0
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161 fprintf(stderr,
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162 "usage: %s pcap-file src|dest ip-addr udp-port outfile [skip-count]\n",
0
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163 argv[0]);
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164 exit(1);
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165 }
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166 pcap = pcap_open_offline(argv[1], errbuf);
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167 if (!pcap) {
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168 fprintf(stderr, "%s: %s\n", argv[1], errbuf);
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169 exit(1);
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170 }
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171 check_dl_type();
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172 if (!strcmp(argv[2], "src")) {
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173 iphdr_addr_offset = 12;
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174 udphdr_port_offset = 0;
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175 } else if (!strcmp(argv[2], "dest")) {
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176 iphdr_addr_offset = 16;
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177 udphdr_port_offset = 2;
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178 } else {
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179 fprintf(stderr,
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180 "error: direction argument must be \"src\" or \"dest\"\n");
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181 exit(1);
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182 }
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183 match_ip_addr = inet_addr(argv[3]);
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184 if (match_ip_addr == INADDR_NONE) {
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185 fprintf(stderr, "error: IP address argument is invalid\n");
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186 exit(1);
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187 }
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188 match_udp_port = htons(strtoul(argv[4], 0, 0));
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189 outfile = fopen(argv[5], "w");
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190 if (!outfile) {
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191 perror(argv[5]);
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192 exit(1);
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193 }
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194 if (argv[6])
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195 skip_num = strtoul(argv[6], 0, 0);
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196 else
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197 skip_num = 0;
0
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198 for (pkt_idx = 0; ; pkt_idx++) {
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199 pkt = pcap_next(pcap, &pkthdr);
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200 if (!pkt)
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201 break;
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diff changeset
202 if (pkt_idx < skip_num)
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203 continue;
0
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204 process_packet(pkt, (unsigned) pkthdr.caplen, pkt_idx);
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205 }
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206 if (!stream_init_flag) {
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207 fprintf(stderr, "error: specified RTP stream not found\n");
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208 exit(1);
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209 }
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210 fclose(outfile);
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211 exit(0);
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212 }