FreeCalypso > hg > themwi-system-sw

annotate sip-in/sip_udp.c @ 169:648a64b2e16b

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mgw: accept Themyscira-extension RTP BFI packets
author Mychaela Falconia <falcon@freecalypso.org>
date Sat, 19 Nov 2022 23:08:49 -0800
parents ff4b76a107a1
children
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47
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1 /*
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2 * In this module we implement our UDP socket for SIP,
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3 * and the associated lowest-level protocol handling.
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4 */
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5
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6 #include <sys/types.h>
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7 #include <sys/socket.h>
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8 #include <netinet/in.h>
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9 #include <stdio.h>
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10 #include <stdlib.h>
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11 #include <string.h>
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12 #include <strings.h>
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13 #include <syslog.h>
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14 #include <unistd.h>
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15 #include "../libsip/parse.h"
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16 #include "../libsip/out_msg.h"
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17
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18 extern struct in_addr sip_bind_ip;
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19 extern unsigned sip_bind_port;
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20
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21 int sip_socket;
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22
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23 open_sip_udp_socket()
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24 {
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25 struct sockaddr_in sin;
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26 int rc;
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27
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28 sip_socket = socket(AF_INET, SOCK_DGRAM, 0);
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29 if (sip_socket < 0) {
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30 syslog(LOG_CRIT, "socket(AF_INET, SOCK_DGRAM, 0): %m");
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31 return(-1);
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32 }
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33 sin.sin_family = AF_INET;
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34 sin.sin_addr = sip_bind_ip;
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35 sin.sin_port = htons(sip_bind_port);
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36 rc = bind(sip_socket, (struct sockaddr *) &sin, sizeof sin);
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37 if (rc < 0) {
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38 syslog(LOG_CRIT, "bind of SIP UDP socket: %m");
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39 return(-1);
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40 }
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41 update_max_fd(sip_socket);
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42 return(0);
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43 }
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44
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45 void
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46 sip_socket_select()
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47 {
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48 struct sip_pkt_rx pkt;
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49 struct sockaddr_in sin;
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50 socklen_t addrlen;
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51 int rc;
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52
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53 addrlen = sizeof sin;
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54 rc = recvfrom(sip_socket, pkt.pkt_buffer, MAX_SIP_RX_PACKET, 0,
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55 (struct sockaddr *) &sin, &addrlen);
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56 if (rc <= 0)
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57 return;
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58 pkt.pkt_length = rc;
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59 log_sip_msg_rx(pkt.pkt_buffer, pkt.pkt_length, &sin);
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60 rc = parse_incoming_sip_msg(&pkt);
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61 if (rc < 0) {
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62 /* parse errors */
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63 if (rc == -2 && pkt.parse_msgtype == SIP_MSG_TYPE_REQ)
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64 syslog(LOG_ERR,
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65 "SIP %.16s msg exceeds MAX_HEADER_FIELDS",
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66 pkt.req_method);
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67 else if (rc == -2 && pkt.parse_msgtype == SIP_MSG_TYPE_RESP)
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68 syslog(LOG_ERR,
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69 "SIP response msg exceeds MAX_HEADER_FIELDS");
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70 /* in any case, silently discard */
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71 return;
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72 }
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73 /* dispatch good-so-far SIP message */
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74 if (pkt.parse_msgtype == SIP_MSG_TYPE_REQ)
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75 process_sip_request(&pkt, &sin);
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76 else if (pkt.parse_msgtype == SIP_MSG_TYPE_RESP)
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77 process_sip_response(&pkt, &sin);
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78 }
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79
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80 void
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81 sip_tx_packet(msg, sin)
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82 struct sip_msg_out *msg;
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83 struct sockaddr_in *sin;
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84 {
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85 socklen_t addrlen;
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86
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87 addrlen = sizeof(struct sockaddr_in);
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88 sendto(sip_socket, msg->buf, msg->msg_len, 0, (struct sockaddr *) sin,
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89 addrlen);
47
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90 log_sip_msg_tx(msg->buf, msg->msg_len, sin);
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91 }