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annotate pcap-study/rtp-tw5-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 1bc144545563
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 timestamp increments of 160 units per packet. The selected
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6 * RTP stream is saved in a TW-TS-005 hexadecimal file.
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7 */
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8
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9 #include <sys/types.h>
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10 #include <sys/socket.h>
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11 #include <netinet/in.h>
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12 #include <arpa/inet.h>
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13 #include <stdio.h>
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14 #include <stdlib.h>
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15 #include <string.h>
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16 #include <strings.h>
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17 #include <pcap/pcap.h>
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18
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19 static pcap_t *pcap;
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20 static in_addr_t match_ip_addr;
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21 static u_short match_udp_port;
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22 static unsigned iphdr_addr_offset, udphdr_port_offset;
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23 static unsigned link_hdr_len, ethertype_offset;
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24 static FILE *outfile;
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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 fprintf(stderr,
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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 exit(1);
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71 }
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72 if (cur_seq != last_seq + 1 &&
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73 (cur_seq != 0 || last_seq != 0xFFFF)) {
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74 fprintf(stderr,
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75 "error in packet #%u: seq break from 0x%04X to 0x%04X\n",
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76 pkt_idx, last_seq, cur_seq);
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77 exit(1);
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78 }
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79 if (cur_tstamp != last_tstamp + 160) {
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80 fprintf(stderr,
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81 "error in packet #%u: timestamp break from 0x%08X to 0x%08X\n",
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82 pkt_idx, last_tstamp, cur_tstamp);
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83 exit(1);
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84 }
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85 } else {
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86 stream_init_flag = 1;
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87 stream_ssrc = cur_ssrc;
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88 }
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89 last_seq = cur_seq;
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90 last_tstamp = cur_tstamp;
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91 }
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92
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93 static void
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94 emit_hex_frame(frame, nbytes)
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95 u_char *frame;
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96 unsigned nbytes;
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97 {
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98 unsigned n;
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99
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100 for (n = 0; n < nbytes; n++)
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101 fprintf(outfile, "%02X", frame[n]);
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102 putc('\n', outfile);
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103 }
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104
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105 static void
0
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106 process_packet(pkt, caplen, pkt_idx)
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107 u_char *pkt;
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108 unsigned caplen, pkt_idx;
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109 {
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110 unsigned udplen, payload_len;
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111
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112 if (caplen < link_hdr_len + 28)
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113 return;
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114 if (link_hdr_len) {
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115 if (pkt[ethertype_offset] != 0x08)
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116 return;
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117 if (pkt[ethertype_offset+1] != 0x00)
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118 return;
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119 pkt += link_hdr_len;
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120 caplen -= link_hdr_len;
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121 }
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122 /* check IP header */
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123 if (pkt[0] != 0x45)
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124 return;
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125 if (pkt[9] != 17) /* UDP */
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126 return;
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127 if (bcmp(pkt + iphdr_addr_offset, &match_ip_addr, 4))
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128 return;
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129 /* check UDP header */
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130 if (bcmp(pkt + 20 + udphdr_port_offset, &match_udp_port, 2))
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131 return;
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132 /* it is our target - now scrutinize it */
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parents:
diff changeset
133 udplen = (pkt[24] << 8) | pkt[25];
05ff0f7ac977 initial commit: split from gsm-codec-lib
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parents:
diff changeset
134 if (caplen < udplen + 20) {
05ff0f7ac977 initial commit: split from gsm-codec-lib
Mychaela Falconia <falcon@freecalypso.org>
parents:
diff changeset
135 fprintf(stderr,
05ff0f7ac977 initial commit: split from gsm-codec-lib
Mychaela Falconia <falcon@freecalypso.org>
parents:
diff changeset
136 "error: packet #%u is truncated in the capture\n",
05ff0f7ac977 initial commit: split from gsm-codec-lib
Mychaela Falconia <falcon@freecalypso.org>
parents:
diff changeset
137 pkt_idx);
05ff0f7ac977 initial commit: split from gsm-codec-lib
Mychaela Falconia <falcon@freecalypso.org>
parents:
diff changeset
138 exit(1);
05ff0f7ac977 initial commit: split from gsm-codec-lib
Mychaela Falconia <falcon@freecalypso.org>
parents:
diff changeset
139 }
05ff0f7ac977 initial commit: split from gsm-codec-lib
Mychaela Falconia <falcon@freecalypso.org>
parents:
diff changeset
140 if (udplen < 20) {
05ff0f7ac977 initial commit: split from gsm-codec-lib
Mychaela Falconia <falcon@freecalypso.org>
parents:
diff changeset
141 fprintf(stderr,
05ff0f7ac977 initial commit: split from gsm-codec-lib
Mychaela Falconia <falcon@freecalypso.org>
parents:
diff changeset
142 "error in packet #%u: UDP length is too short for RTP header\n",
05ff0f7ac977 initial commit: split from gsm-codec-lib
Mychaela Falconia <falcon@freecalypso.org>
parents:
diff changeset
143 pkt_idx);
05ff0f7ac977 initial commit: split from gsm-codec-lib
Mychaela Falconia <falcon@freecalypso.org>
parents:
diff changeset
144 exit(1);
05ff0f7ac977 initial commit: split from gsm-codec-lib
Mychaela Falconia <falcon@freecalypso.org>
parents:
diff changeset
145 }
05ff0f7ac977 initial commit: split from gsm-codec-lib
Mychaela Falconia <falcon@freecalypso.org>
parents:
diff changeset
146 if (pkt[28] != 0x80) {
05ff0f7ac977 initial commit: split from gsm-codec-lib
Mychaela Falconia <falcon@freecalypso.org>
parents:
diff changeset
147 fprintf(stderr,
05ff0f7ac977 initial commit: split from gsm-codec-lib
Mychaela Falconia <falcon@freecalypso.org>
parents:
diff changeset
148 "error in packet #%u: unsupported RTP header structure\n",
05ff0f7ac977 initial commit: split from gsm-codec-lib
Mychaela Falconia <falcon@freecalypso.org>
parents:
diff changeset
149 pkt_idx);
05ff0f7ac977 initial commit: split from gsm-codec-lib
Mychaela Falconia <falcon@freecalypso.org>
parents:
diff changeset
150 exit(1);
05ff0f7ac977 initial commit: split from gsm-codec-lib
Mychaela Falconia <falcon@freecalypso.org>
parents:
diff changeset
151 }
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Mychaela Falconia <falcon@freecalypso.org>
parents:
diff changeset
152 rtp_stream_logic(pkt + 28, pkt_idx);
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Mychaela Falconia <falcon@freecalypso.org>
parents:
diff changeset
153 payload_len = udplen - 20;
16
1bc144545563 pcap-study: new program rtp-tw5-extr
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parents: 10
diff changeset
154 if (payload_len > 40) {
1bc144545563 pcap-study: new program rtp-tw5-extr
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parents: 10
diff changeset
155 fprintf(stderr,
1bc144545563 pcap-study: new program rtp-tw5-extr
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parents: 10
diff changeset
156 "error in packet #%u: payload exceeds TW-TS-005 limit\n",
0
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Mychaela Falconia <falcon@freecalypso.org>
parents:
diff changeset
157 pkt_idx);
05ff0f7ac977 initial commit: split from gsm-codec-lib
Mychaela Falconia <falcon@freecalypso.org>
parents:
diff changeset
158 exit(1);
05ff0f7ac977 initial commit: split from gsm-codec-lib
Mychaela Falconia <falcon@freecalypso.org>
parents:
diff changeset
159 }
16
1bc144545563 pcap-study: new program rtp-tw5-extr
Mychaela Falconia <falcon@freecalypso.org>
parents: 10
diff changeset
160 if (payload_len)
1bc144545563 pcap-study: new program rtp-tw5-extr
Mychaela Falconia <falcon@freecalypso.org>
parents: 10
diff changeset
161 emit_hex_frame(pkt + 40, payload_len);
1bc144545563 pcap-study: new program rtp-tw5-extr
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parents: 10
diff changeset
162 else
1bc144545563 pcap-study: new program rtp-tw5-extr
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parents: 10
diff changeset
163 fputs("NULL\n", outfile);
0
05ff0f7ac977 initial commit: split from gsm-codec-lib
Mychaela Falconia <falcon@freecalypso.org>
parents:
diff changeset
164 }
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parents:
diff changeset
165
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parents:
diff changeset
166 main(argc, argv)
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parents:
diff changeset
167 char **argv;
05ff0f7ac977 initial commit: split from gsm-codec-lib
Mychaela Falconia <falcon@freecalypso.org>
parents:
diff changeset
168 {
05ff0f7ac977 initial commit: split from gsm-codec-lib
Mychaela Falconia <falcon@freecalypso.org>
parents:
diff changeset
169 char errbuf[PCAP_ERRBUF_SIZE];
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Mychaela Falconia <falcon@freecalypso.org>
parents:
diff changeset
170 u_char *pkt;
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parents:
diff changeset
171 struct pcap_pkthdr pkthdr;
7
9b0613775cf6 rtp-g711-extr: add ability to skip some number of packets,
Mychaela Falconia <falcon@freecalypso.org>
parents: 0
diff changeset
172 unsigned pkt_idx, skip_num;
0
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parents:
diff changeset
173
7
9b0613775cf6 rtp-g711-extr: add ability to skip some number of packets,
Mychaela Falconia <falcon@freecalypso.org>
parents: 0
diff changeset
174 if (argc < 6 || argc > 7) {
0
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Mychaela Falconia <falcon@freecalypso.org>
parents:
diff changeset
175 fprintf(stderr,
7
9b0613775cf6 rtp-g711-extr: add ability to skip some number of packets,
Mychaela Falconia <falcon@freecalypso.org>
parents: 0
diff changeset
176 "usage: %s pcap-file src|dest ip-addr udp-port outfile [skip-count]\n",
0
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Mychaela Falconia <falcon@freecalypso.org>
parents:
diff changeset
177 argv[0]);
05ff0f7ac977 initial commit: split from gsm-codec-lib
Mychaela Falconia <falcon@freecalypso.org>
parents:
diff changeset
178 exit(1);
05ff0f7ac977 initial commit: split from gsm-codec-lib
Mychaela Falconia <falcon@freecalypso.org>
parents:
diff changeset
179 }
05ff0f7ac977 initial commit: split from gsm-codec-lib
Mychaela Falconia <falcon@freecalypso.org>
parents:
diff changeset
180 pcap = pcap_open_offline(argv[1], errbuf);
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Mychaela Falconia <falcon@freecalypso.org>
parents:
diff changeset
181 if (!pcap) {
05ff0f7ac977 initial commit: split from gsm-codec-lib
Mychaela Falconia <falcon@freecalypso.org>
parents:
diff changeset
182 fprintf(stderr, "%s: %s\n", argv[1], errbuf);
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parents:
diff changeset
183 exit(1);
05ff0f7ac977 initial commit: split from gsm-codec-lib
Mychaela Falconia <falcon@freecalypso.org>
parents:
diff changeset
184 }
05ff0f7ac977 initial commit: split from gsm-codec-lib
Mychaela Falconia <falcon@freecalypso.org>
parents:
diff changeset
185 check_dl_type();
05ff0f7ac977 initial commit: split from gsm-codec-lib
Mychaela Falconia <falcon@freecalypso.org>
parents:
diff changeset
186 if (!strcmp(argv[2], "src")) {
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Mychaela Falconia <falcon@freecalypso.org>
parents:
diff changeset
187 iphdr_addr_offset = 12;
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Mychaela Falconia <falcon@freecalypso.org>
parents:
diff changeset
188 udphdr_port_offset = 0;
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Mychaela Falconia <falcon@freecalypso.org>
parents:
diff changeset
189 } else if (!strcmp(argv[2], "dest")) {
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diff changeset
190 iphdr_addr_offset = 16;
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Mychaela Falconia <falcon@freecalypso.org>
parents:
diff changeset
191 udphdr_port_offset = 2;
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Mychaela Falconia <falcon@freecalypso.org>
parents:
diff changeset
192 } else {
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parents:
diff changeset
193 fprintf(stderr,
05ff0f7ac977 initial commit: split from gsm-codec-lib
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parents:
diff changeset
194 "error: direction argument must be \"src\" or \"dest\"\n");
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parents:
diff changeset
195 exit(1);
05ff0f7ac977 initial commit: split from gsm-codec-lib
Mychaela Falconia <falcon@freecalypso.org>
parents:
diff changeset
196 }
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Mychaela Falconia <falcon@freecalypso.org>
parents:
diff changeset
197 match_ip_addr = inet_addr(argv[3]);
05ff0f7ac977 initial commit: split from gsm-codec-lib
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parents:
diff changeset
198 if (match_ip_addr == INADDR_NONE) {
05ff0f7ac977 initial commit: split from gsm-codec-lib
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parents:
diff changeset
199 fprintf(stderr, "error: IP address argument is invalid\n");
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diff changeset
200 exit(1);
05ff0f7ac977 initial commit: split from gsm-codec-lib
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parents:
diff changeset
201 }
05ff0f7ac977 initial commit: split from gsm-codec-lib
Mychaela Falconia <falcon@freecalypso.org>
parents:
diff changeset
202 match_udp_port = htons(strtoul(argv[4], 0, 0));
05ff0f7ac977 initial commit: split from gsm-codec-lib
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parents:
diff changeset
203 outfile = fopen(argv[5], "w");
05ff0f7ac977 initial commit: split from gsm-codec-lib
Mychaela Falconia <falcon@freecalypso.org>
parents:
diff changeset
204 if (!outfile) {
05ff0f7ac977 initial commit: split from gsm-codec-lib
Mychaela Falconia <falcon@freecalypso.org>
parents:
diff changeset
205 perror(argv[5]);
05ff0f7ac977 initial commit: split from gsm-codec-lib
Mychaela Falconia <falcon@freecalypso.org>
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diff changeset
206 exit(1);
05ff0f7ac977 initial commit: split from gsm-codec-lib
Mychaela Falconia <falcon@freecalypso.org>
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diff changeset
207 }
7
9b0613775cf6 rtp-g711-extr: add ability to skip some number of packets,
Mychaela Falconia <falcon@freecalypso.org>
parents: 0
diff changeset
208 if (argv[6])
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parents: 0
diff changeset
209 skip_num = strtoul(argv[6], 0, 0);
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Mychaela Falconia <falcon@freecalypso.org>
parents: 0
diff changeset
210 else
9b0613775cf6 rtp-g711-extr: add ability to skip some number of packets,
Mychaela Falconia <falcon@freecalypso.org>
parents: 0
diff changeset
211 skip_num = 0;
0
05ff0f7ac977 initial commit: split from gsm-codec-lib
Mychaela Falconia <falcon@freecalypso.org>
parents:
diff changeset
212 for (pkt_idx = 0; ; pkt_idx++) {
05ff0f7ac977 initial commit: split from gsm-codec-lib
Mychaela Falconia <falcon@freecalypso.org>
parents:
diff changeset
213 pkt = pcap_next(pcap, &pkthdr);
05ff0f7ac977 initial commit: split from gsm-codec-lib
Mychaela Falconia <falcon@freecalypso.org>
parents:
diff changeset
214 if (!pkt)
05ff0f7ac977 initial commit: split from gsm-codec-lib
Mychaela Falconia <falcon@freecalypso.org>
parents:
diff changeset
215 break;
7
9b0613775cf6 rtp-g711-extr: add ability to skip some number of packets,
Mychaela Falconia <falcon@freecalypso.org>
parents: 0
diff changeset
216 if (pkt_idx < skip_num)
9b0613775cf6 rtp-g711-extr: add ability to skip some number of packets,
Mychaela Falconia <falcon@freecalypso.org>
parents: 0
diff changeset
217 continue;
0
05ff0f7ac977 initial commit: split from gsm-codec-lib
Mychaela Falconia <falcon@freecalypso.org>
parents:
diff changeset
218 process_packet(pkt, (unsigned) pkthdr.caplen, pkt_idx);
05ff0f7ac977 initial commit: split from gsm-codec-lib
Mychaela Falconia <falcon@freecalypso.org>
parents:
diff changeset
219 }
05ff0f7ac977 initial commit: split from gsm-codec-lib
Mychaela Falconia <falcon@freecalypso.org>
parents:
diff changeset
220 if (!stream_init_flag) {
05ff0f7ac977 initial commit: split from gsm-codec-lib
Mychaela Falconia <falcon@freecalypso.org>
parents:
diff changeset
221 fprintf(stderr, "error: specified RTP stream not found\n");
05ff0f7ac977 initial commit: split from gsm-codec-lib
Mychaela Falconia <falcon@freecalypso.org>
parents:
diff changeset
222 exit(1);
05ff0f7ac977 initial commit: split from gsm-codec-lib
Mychaela Falconia <falcon@freecalypso.org>
parents:
diff changeset
223 }
05ff0f7ac977 initial commit: split from gsm-codec-lib
Mychaela Falconia <falcon@freecalypso.org>
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diff changeset
224 fclose(outfile);
05ff0f7ac977 initial commit: split from gsm-codec-lib
Mychaela Falconia <falcon@freecalypso.org>
parents:
diff changeset
225 exit(0);
05ff0f7ac977 initial commit: split from gsm-codec-lib
Mychaela Falconia <falcon@freecalypso.org>
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diff changeset
226 }