FreeCalypso > hg > gsm-codec-lib

annotate pcap/rtp-cont-check.c @ 183:452c1d5a6268

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libgsmefr BFI w/o data: emit zero output after decoder reset In real-life usage, each EFR decoder session will most likely begin with lots of BFI frames before the first real frame arrives. However, because the spec-defined home state of the decoder is speech rather than CN, our regular logic for BFI w/o data would have to feed pseudorandom noise to the decoder (in the "fixed codebook excitation pulses" part), which is silly to do at the beginning of the decoder session right out of reset. Therefore, let's check reset_flag_old, and if we are still in the reset state, simply emit zero output.
author Mychaela Falconia <falcon@freecalypso.org>
date Tue, 03 Jan 2023 00:12:18 +0000
parents 693a0958a303
children 10f11a2d4042
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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
171
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4 * IP:port, and checks its continuity: verifies that the sequence
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5 * number always increments by 1 and that the timestamp always
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6 * increments by 160 units. Finally, this program prints out
172
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7 * the minimum and maximum observed capture time deltas between
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8 * successive packets of the stream.
170
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9 *
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10 * The codec can be anything, and this program can also be used to
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11 * check continuity of RTP streams coming from PSTN/SIP, but the
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12 * core assumption is that packets must arrive every 20 ms, with
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13 * the timestamp field incrementing by 160 units each time.
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14 */
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16 #include <sys/types.h>
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17 #include <sys/socket.h>
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18 #include <sys/time.h>
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19 #include <netinet/in.h>
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20 #include <arpa/inet.h>
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21 #include <stdio.h>
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22 #include <stdlib.h>
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23 #include <string.h>
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24 #include <strings.h>
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25 #include <pcap/pcap.h>
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26
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27 static pcap_t *pcap;
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28 static in_addr_t match_ip_addr;
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29 static u_short match_udp_port;
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30 static unsigned iphdr_addr_offset, udphdr_port_offset;
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31 static unsigned link_hdr_len, ethertype_offset;
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32 static int stream_init_flag, deltat_init_flag;
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33 static unsigned last_seq, last_tstamp, stream_ssrc;
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34 static struct timeval last_pkt_time;
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35 static unsigned deltat_min, deltat_max;
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36
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37 static void
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38 check_dl_type()
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39 {
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40 int dltype;
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41
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42 dltype = pcap_datalink(pcap);
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43 switch (dltype) {
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44 case DLT_EN10MB:
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45 link_hdr_len = 14;
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46 ethertype_offset = 12;
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47 break;
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48 case DLT_RAW:
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49 link_hdr_len = 0;
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50 break;
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51 case DLT_LINUX_SLL:
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52 link_hdr_len = 16;
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53 ethertype_offset = 14;
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54 break;
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55 default:
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56 fprintf(stderr, "error: unsupported data link type %d\n",
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57 dltype);
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58 exit(1);
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59 }
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60 }
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62 static void
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63 rtp_stream_logic(rtp_hdr, pkt_idx, pkt_time)
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64 u_char *rtp_hdr;
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65 unsigned pkt_idx;
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66 struct timeval *pkt_time;
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67 {
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68 unsigned cur_seq, cur_tstamp, cur_ssrc;
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69 struct timeval deltat;
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70
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71 cur_seq = (rtp_hdr[2] << 8) | rtp_hdr[3];
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72 cur_tstamp = (rtp_hdr[4] << 24) | (rtp_hdr[5] << 16) |
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73 (rtp_hdr[6] << 8) | rtp_hdr[7];
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74 cur_ssrc = (rtp_hdr[8] << 24) | (rtp_hdr[9] << 16) |
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75 (rtp_hdr[10] << 8) | rtp_hdr[11];
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76 if (stream_init_flag) {
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77 if (cur_ssrc != stream_ssrc) {
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78 fprintf(stderr,
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79 "error in packet #%u: SSRC change from 0x%08X to 0x%08X\n",
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80 pkt_idx, stream_ssrc, cur_ssrc);
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81 exit(1);
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82 }
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83 if (cur_seq != last_seq + 1) {
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84 fprintf(stderr,
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85 "error in packet #%u: seq break from 0x%04X to 0x%04X\n",
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86 pkt_idx, last_seq, cur_seq);
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87 exit(1);
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88 }
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89 if (cur_tstamp != last_tstamp + 160) {
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90 fprintf(stderr,
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91 "error in packet #%u: timestamp break from 0x%08X to 0x%08X\n",
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92 pkt_idx, last_tstamp, cur_tstamp);
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93 exit(1);
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94 }
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95 if (timercmp(pkt_time, &last_pkt_time, <)) {
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96 fprintf(stderr,
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97 "packet #%u timing error: Rx time goes backward\n",
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98 pkt_idx);
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99 exit(1);
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100 }
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101 timersub(pkt_time, &last_pkt_time, &deltat);
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102 if (deltat.tv_sec) {
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103 fprintf(stderr,
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104 "packet #%u timing error: Rx time gap >= 1 s\n",
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105 pkt_idx);
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106 exit(1);
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107 }
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108 if (deltat_init_flag) {
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109 if (deltat.tv_usec < deltat_min)
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110 deltat_min = deltat.tv_usec;
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111 if (deltat.tv_usec > deltat_max)
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112 deltat_max = deltat.tv_usec;
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113 } else {
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114 deltat_min = deltat.tv_usec;
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115 deltat_max = deltat.tv_usec;
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116 deltat_init_flag = 1;
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117 }
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118 } else {
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119 stream_init_flag = 1;
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120 stream_ssrc = cur_ssrc;
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121 }
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122 last_seq = cur_seq;
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123 last_tstamp = cur_tstamp;
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124 bcopy(pkt_time, &last_pkt_time, sizeof(struct timeval));
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125 }
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126
851ca64e38e9 rtp-gsmfr-extr program written, compiles
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parents:
diff changeset
127 static void
170
b9af126bfddb rtp-cont-check utility written
Mychaela Falconia <falcon@freecalypso.org>
parents: 15
diff changeset
128 process_packet(pkt, caplen, pkt_idx, pkt_time)
15
851ca64e38e9 rtp-gsmfr-extr program written, compiles
Mychaela Falconia <falcon@freecalypso.org>
parents:
diff changeset
129 u_char *pkt;
851ca64e38e9 rtp-gsmfr-extr program written, compiles
Mychaela Falconia <falcon@freecalypso.org>
parents:
diff changeset
130 unsigned caplen, pkt_idx;
170
b9af126bfddb rtp-cont-check utility written
Mychaela Falconia <falcon@freecalypso.org>
parents: 15
diff changeset
131 struct timeval *pkt_time;
15
851ca64e38e9 rtp-gsmfr-extr program written, compiles
Mychaela Falconia <falcon@freecalypso.org>
parents:
diff changeset
132 {
170
b9af126bfddb rtp-cont-check utility written
Mychaela Falconia <falcon@freecalypso.org>
parents: 15
diff changeset
133 unsigned udplen;
15
851ca64e38e9 rtp-gsmfr-extr program written, compiles
Mychaela Falconia <falcon@freecalypso.org>
parents:
diff changeset
134
851ca64e38e9 rtp-gsmfr-extr program written, compiles
Mychaela Falconia <falcon@freecalypso.org>
parents:
diff changeset
135 if (caplen < link_hdr_len + 28)
851ca64e38e9 rtp-gsmfr-extr program written, compiles
Mychaela Falconia <falcon@freecalypso.org>
parents:
diff changeset
136 return;
851ca64e38e9 rtp-gsmfr-extr program written, compiles
Mychaela Falconia <falcon@freecalypso.org>
parents:
diff changeset
137 if (link_hdr_len) {
851ca64e38e9 rtp-gsmfr-extr program written, compiles
Mychaela Falconia <falcon@freecalypso.org>
parents:
diff changeset
138 if (pkt[ethertype_offset] != 0x08)
851ca64e38e9 rtp-gsmfr-extr program written, compiles
Mychaela Falconia <falcon@freecalypso.org>
parents:
diff changeset
139 return;
851ca64e38e9 rtp-gsmfr-extr program written, compiles
Mychaela Falconia <falcon@freecalypso.org>
parents:
diff changeset
140 if (pkt[ethertype_offset+1] != 0x00)
851ca64e38e9 rtp-gsmfr-extr program written, compiles
Mychaela Falconia <falcon@freecalypso.org>
parents:
diff changeset
141 return;
851ca64e38e9 rtp-gsmfr-extr program written, compiles
Mychaela Falconia <falcon@freecalypso.org>
parents:
diff changeset
142 pkt += link_hdr_len;
851ca64e38e9 rtp-gsmfr-extr program written, compiles
Mychaela Falconia <falcon@freecalypso.org>
parents:
diff changeset
143 caplen -= link_hdr_len;
851ca64e38e9 rtp-gsmfr-extr program written, compiles
Mychaela Falconia <falcon@freecalypso.org>
parents:
diff changeset
144 }
851ca64e38e9 rtp-gsmfr-extr program written, compiles
Mychaela Falconia <falcon@freecalypso.org>
parents:
diff changeset
145 /* check IP header */
851ca64e38e9 rtp-gsmfr-extr program written, compiles
Mychaela Falconia <falcon@freecalypso.org>
parents:
diff changeset
146 if (pkt[0] != 0x45)
851ca64e38e9 rtp-gsmfr-extr program written, compiles
Mychaela Falconia <falcon@freecalypso.org>
parents:
diff changeset
147 return;
851ca64e38e9 rtp-gsmfr-extr program written, compiles
Mychaela Falconia <falcon@freecalypso.org>
parents:
diff changeset
148 if (pkt[9] != 17) /* UDP */
851ca64e38e9 rtp-gsmfr-extr program written, compiles
Mychaela Falconia <falcon@freecalypso.org>
parents:
diff changeset
149 return;
851ca64e38e9 rtp-gsmfr-extr program written, compiles
Mychaela Falconia <falcon@freecalypso.org>
parents:
diff changeset
150 if (bcmp(pkt + iphdr_addr_offset, &match_ip_addr, 4))
851ca64e38e9 rtp-gsmfr-extr program written, compiles
Mychaela Falconia <falcon@freecalypso.org>
parents:
diff changeset
151 return;
851ca64e38e9 rtp-gsmfr-extr program written, compiles
Mychaela Falconia <falcon@freecalypso.org>
parents:
diff changeset
152 /* check UDP header */
851ca64e38e9 rtp-gsmfr-extr program written, compiles
Mychaela Falconia <falcon@freecalypso.org>
parents:
diff changeset
153 if (bcmp(pkt + 20 + udphdr_port_offset, &match_udp_port, 2))
851ca64e38e9 rtp-gsmfr-extr program written, compiles
Mychaela Falconia <falcon@freecalypso.org>
parents:
diff changeset
154 return;
851ca64e38e9 rtp-gsmfr-extr program written, compiles
Mychaela Falconia <falcon@freecalypso.org>
parents:
diff changeset
155 /* it is our target - now scrutinize it */
851ca64e38e9 rtp-gsmfr-extr program written, compiles
Mychaela Falconia <falcon@freecalypso.org>
parents:
diff changeset
156 udplen = (pkt[24] << 8) | pkt[25];
851ca64e38e9 rtp-gsmfr-extr program written, compiles
Mychaela Falconia <falcon@freecalypso.org>
parents:
diff changeset
157 if (caplen < udplen + 20) {
851ca64e38e9 rtp-gsmfr-extr program written, compiles
Mychaela Falconia <falcon@freecalypso.org>
parents:
diff changeset
158 fprintf(stderr,
851ca64e38e9 rtp-gsmfr-extr program written, compiles
Mychaela Falconia <falcon@freecalypso.org>
parents:
diff changeset
159 "error: packet #%u is truncated in the capture\n",
851ca64e38e9 rtp-gsmfr-extr program written, compiles
Mychaela Falconia <falcon@freecalypso.org>
parents:
diff changeset
160 pkt_idx);
851ca64e38e9 rtp-gsmfr-extr program written, compiles
Mychaela Falconia <falcon@freecalypso.org>
parents:
diff changeset
161 exit(1);
851ca64e38e9 rtp-gsmfr-extr program written, compiles
Mychaela Falconia <falcon@freecalypso.org>
parents:
diff changeset
162 }
851ca64e38e9 rtp-gsmfr-extr program written, compiles
Mychaela Falconia <falcon@freecalypso.org>
parents:
diff changeset
163 if (udplen < 20) {
851ca64e38e9 rtp-gsmfr-extr program written, compiles
Mychaela Falconia <falcon@freecalypso.org>
parents:
diff changeset
164 fprintf(stderr,
851ca64e38e9 rtp-gsmfr-extr program written, compiles
Mychaela Falconia <falcon@freecalypso.org>
parents:
diff changeset
165 "error in packet #%u: UDP length is too short for RTP header\n",
851ca64e38e9 rtp-gsmfr-extr program written, compiles
Mychaela Falconia <falcon@freecalypso.org>
parents:
diff changeset
166 pkt_idx);
851ca64e38e9 rtp-gsmfr-extr program written, compiles
Mychaela Falconia <falcon@freecalypso.org>
parents:
diff changeset
167 exit(1);
851ca64e38e9 rtp-gsmfr-extr program written, compiles
Mychaela Falconia <falcon@freecalypso.org>
parents:
diff changeset
168 }
851ca64e38e9 rtp-gsmfr-extr program written, compiles
Mychaela Falconia <falcon@freecalypso.org>
parents:
diff changeset
169 if (pkt[28] != 0x80) {
851ca64e38e9 rtp-gsmfr-extr program written, compiles
Mychaela Falconia <falcon@freecalypso.org>
parents:
diff changeset
170 fprintf(stderr,
851ca64e38e9 rtp-gsmfr-extr program written, compiles
Mychaela Falconia <falcon@freecalypso.org>
parents:
diff changeset
171 "error in packet #%u: unsupported RTP header structure\n",
851ca64e38e9 rtp-gsmfr-extr program written, compiles
Mychaela Falconia <falcon@freecalypso.org>
parents:
diff changeset
172 pkt_idx);
851ca64e38e9 rtp-gsmfr-extr program written, compiles
Mychaela Falconia <falcon@freecalypso.org>
parents:
diff changeset
173 exit(1);
851ca64e38e9 rtp-gsmfr-extr program written, compiles
Mychaela Falconia <falcon@freecalypso.org>
parents:
diff changeset
174 }
170
b9af126bfddb rtp-cont-check utility written
Mychaela Falconia <falcon@freecalypso.org>
parents: 15
diff changeset
175 rtp_stream_logic(pkt + 28, pkt_idx, pkt_time);
15
851ca64e38e9 rtp-gsmfr-extr program written, compiles
Mychaela Falconia <falcon@freecalypso.org>
parents:
diff changeset
176 }
851ca64e38e9 rtp-gsmfr-extr program written, compiles
Mychaela Falconia <falcon@freecalypso.org>
parents:
diff changeset
177
851ca64e38e9 rtp-gsmfr-extr program written, compiles
Mychaela Falconia <falcon@freecalypso.org>
parents:
diff changeset
178 main(argc, argv)
851ca64e38e9 rtp-gsmfr-extr program written, compiles
Mychaela Falconia <falcon@freecalypso.org>
parents:
diff changeset
179 char **argv;
851ca64e38e9 rtp-gsmfr-extr program written, compiles
Mychaela Falconia <falcon@freecalypso.org>
parents:
diff changeset
180 {
851ca64e38e9 rtp-gsmfr-extr program written, compiles
Mychaela Falconia <falcon@freecalypso.org>
parents:
diff changeset
181 char errbuf[PCAP_ERRBUF_SIZE];
851ca64e38e9 rtp-gsmfr-extr program written, compiles
Mychaela Falconia <falcon@freecalypso.org>
parents:
diff changeset
182 u_char *pkt;
851ca64e38e9 rtp-gsmfr-extr program written, compiles
Mychaela Falconia <falcon@freecalypso.org>
parents:
diff changeset
183 struct pcap_pkthdr pkthdr;
851ca64e38e9 rtp-gsmfr-extr program written, compiles
Mychaela Falconia <falcon@freecalypso.org>
parents:
diff changeset
184 unsigned pkt_idx;
851ca64e38e9 rtp-gsmfr-extr program written, compiles
Mychaela Falconia <falcon@freecalypso.org>
parents:
diff changeset
185
170
b9af126bfddb rtp-cont-check utility written
Mychaela Falconia <falcon@freecalypso.org>
parents: 15
diff changeset
186 if (argc != 5) {
15
851ca64e38e9 rtp-gsmfr-extr program written, compiles
Mychaela Falconia <falcon@freecalypso.org>
parents:
diff changeset
187 fprintf(stderr,
170
b9af126bfddb rtp-cont-check utility written
Mychaela Falconia <falcon@freecalypso.org>
parents: 15
diff changeset
188 "usage: %s pcap-file src|dest ip-addr udp-port\n",
15
851ca64e38e9 rtp-gsmfr-extr program written, compiles
Mychaela Falconia <falcon@freecalypso.org>
parents:
diff changeset
189 argv[0]);
851ca64e38e9 rtp-gsmfr-extr program written, compiles
Mychaela Falconia <falcon@freecalypso.org>
parents:
diff changeset
190 exit(1);
851ca64e38e9 rtp-gsmfr-extr program written, compiles
Mychaela Falconia <falcon@freecalypso.org>
parents:
diff changeset
191 }
851ca64e38e9 rtp-gsmfr-extr program written, compiles
Mychaela Falconia <falcon@freecalypso.org>
parents:
diff changeset
192 pcap = pcap_open_offline(argv[1], errbuf);
851ca64e38e9 rtp-gsmfr-extr program written, compiles
Mychaela Falconia <falcon@freecalypso.org>
parents:
diff changeset
193 if (!pcap) {
851ca64e38e9 rtp-gsmfr-extr program written, compiles
Mychaela Falconia <falcon@freecalypso.org>
parents:
diff changeset
194 fprintf(stderr, "%s: %s\n", argv[1], errbuf);
851ca64e38e9 rtp-gsmfr-extr program written, compiles
Mychaela Falconia <falcon@freecalypso.org>
parents:
diff changeset
195 exit(1);
851ca64e38e9 rtp-gsmfr-extr program written, compiles
Mychaela Falconia <falcon@freecalypso.org>
parents:
diff changeset
196 }
851ca64e38e9 rtp-gsmfr-extr program written, compiles
Mychaela Falconia <falcon@freecalypso.org>
parents:
diff changeset
197 check_dl_type();
851ca64e38e9 rtp-gsmfr-extr program written, compiles
Mychaela Falconia <falcon@freecalypso.org>
parents:
diff changeset
198 if (!strcmp(argv[2], "src")) {
851ca64e38e9 rtp-gsmfr-extr program written, compiles
Mychaela Falconia <falcon@freecalypso.org>
parents:
diff changeset
199 iphdr_addr_offset = 12;
851ca64e38e9 rtp-gsmfr-extr program written, compiles
Mychaela Falconia <falcon@freecalypso.org>
parents:
diff changeset
200 udphdr_port_offset = 0;
851ca64e38e9 rtp-gsmfr-extr program written, compiles
Mychaela Falconia <falcon@freecalypso.org>
parents:
diff changeset
201 } else if (!strcmp(argv[2], "dest")) {
851ca64e38e9 rtp-gsmfr-extr program written, compiles
Mychaela Falconia <falcon@freecalypso.org>
parents:
diff changeset
202 iphdr_addr_offset = 16;
851ca64e38e9 rtp-gsmfr-extr program written, compiles
Mychaela Falconia <falcon@freecalypso.org>
parents:
diff changeset
203 udphdr_port_offset = 2;
851ca64e38e9 rtp-gsmfr-extr program written, compiles
Mychaela Falconia <falcon@freecalypso.org>
parents:
diff changeset
204 } else {
851ca64e38e9 rtp-gsmfr-extr program written, compiles
Mychaela Falconia <falcon@freecalypso.org>
parents:
diff changeset
205 fprintf(stderr,
851ca64e38e9 rtp-gsmfr-extr program written, compiles
Mychaela Falconia <falcon@freecalypso.org>
parents:
diff changeset
206 "error: direction argument must be \"src\" or \"dest\"\n");
851ca64e38e9 rtp-gsmfr-extr program written, compiles
Mychaela Falconia <falcon@freecalypso.org>
parents:
diff changeset
207 exit(1);
851ca64e38e9 rtp-gsmfr-extr program written, compiles
Mychaela Falconia <falcon@freecalypso.org>
parents:
diff changeset
208 }
851ca64e38e9 rtp-gsmfr-extr program written, compiles
Mychaela Falconia <falcon@freecalypso.org>
parents:
diff changeset
209 match_ip_addr = inet_addr(argv[3]);
851ca64e38e9 rtp-gsmfr-extr program written, compiles
Mychaela Falconia <falcon@freecalypso.org>
parents:
diff changeset
210 if (match_ip_addr == INADDR_NONE) {
851ca64e38e9 rtp-gsmfr-extr program written, compiles
Mychaela Falconia <falcon@freecalypso.org>
parents:
diff changeset
211 fprintf(stderr, "error: IP address argument is invalid\n");
851ca64e38e9 rtp-gsmfr-extr program written, compiles
Mychaela Falconia <falcon@freecalypso.org>
parents:
diff changeset
212 exit(1);
851ca64e38e9 rtp-gsmfr-extr program written, compiles
Mychaela Falconia <falcon@freecalypso.org>
parents:
diff changeset
213 }
851ca64e38e9 rtp-gsmfr-extr program written, compiles
Mychaela Falconia <falcon@freecalypso.org>
parents:
diff changeset
214 match_udp_port = htons(strtoul(argv[4], 0, 0));
851ca64e38e9 rtp-gsmfr-extr program written, compiles
Mychaela Falconia <falcon@freecalypso.org>
parents:
diff changeset
215 for (pkt_idx = 0; ; pkt_idx++) {
851ca64e38e9 rtp-gsmfr-extr program written, compiles
Mychaela Falconia <falcon@freecalypso.org>
parents:
diff changeset
216 pkt = pcap_next(pcap, &pkthdr);
851ca64e38e9 rtp-gsmfr-extr program written, compiles
Mychaela Falconia <falcon@freecalypso.org>
parents:
diff changeset
217 if (!pkt)
851ca64e38e9 rtp-gsmfr-extr program written, compiles
Mychaela Falconia <falcon@freecalypso.org>
parents:
diff changeset
218 break;
170
b9af126bfddb rtp-cont-check utility written
Mychaela Falconia <falcon@freecalypso.org>
parents: 15
diff changeset
219 process_packet(pkt, (unsigned) pkthdr.caplen, pkt_idx,
b9af126bfddb rtp-cont-check utility written
Mychaela Falconia <falcon@freecalypso.org>
parents: 15
diff changeset
220 &pkthdr.ts);
15
851ca64e38e9 rtp-gsmfr-extr program written, compiles
Mychaela Falconia <falcon@freecalypso.org>
parents:
diff changeset
221 }
851ca64e38e9 rtp-gsmfr-extr program written, compiles
Mychaela Falconia <falcon@freecalypso.org>
parents:
diff changeset
222 if (!stream_init_flag) {
851ca64e38e9 rtp-gsmfr-extr program written, compiles
Mychaela Falconia <falcon@freecalypso.org>
parents:
diff changeset
223 fprintf(stderr, "error: specified RTP stream not found\n");
851ca64e38e9 rtp-gsmfr-extr program written, compiles
Mychaela Falconia <falcon@freecalypso.org>
parents:
diff changeset
224 exit(1);
851ca64e38e9 rtp-gsmfr-extr program written, compiles
Mychaela Falconia <falcon@freecalypso.org>
parents:
diff changeset
225 }
172
693a0958a303 yet another refactoring of RTP tools:
Mychaela Falconia <falcon@freecalypso.org>
parents: 171
diff changeset
226 if (!deltat_init_flag) {
693a0958a303 yet another refactoring of RTP tools:
Mychaela Falconia <falcon@freecalypso.org>
parents: 171
diff changeset
227 fprintf(stderr, "error: found only one matching packet\n");
693a0958a303 yet another refactoring of RTP tools:
Mychaela Falconia <falcon@freecalypso.org>
parents: 171
diff changeset
228 exit(1);
693a0958a303 yet another refactoring of RTP tools:
Mychaela Falconia <falcon@freecalypso.org>
parents: 171
diff changeset
229 }
693a0958a303 yet another refactoring of RTP tools:
Mychaela Falconia <falcon@freecalypso.org>
parents: 171
diff changeset
230 printf("Minimum time delta: %u us\n", deltat_min);
693a0958a303 yet another refactoring of RTP tools:
Mychaela Falconia <falcon@freecalypso.org>
parents: 171
diff changeset
231 printf("Maximum time delta: %u us\n", deltat_max);
15
851ca64e38e9 rtp-gsmfr-extr program written, compiles
Mychaela Falconia <falcon@freecalypso.org>
parents:
diff changeset
232 exit(0);
851ca64e38e9 rtp-gsmfr-extr program written, compiles
Mychaela Falconia <falcon@freecalypso.org>
parents:
diff changeset
233 }