FreeCalypso > hg > themwi-system-sw

annotate sip-manual-out/sip_udp.c @ 124:7e04d28fae8b

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sip-in: default use-100rel to no BulkVS servers act badly when we send a reliable 180 Ringing response to an incoming call, even though they advertise 100rel support in the Supported header in the INVITE packet, and we probably won't be implementing 100rel for outbound because doing per-the-spec PRACK as a UAC is just too burdensome. Therefore, we need to consider 100rel extension as not-really-supported in themwi-system-sw.
author Mychaela Falconia <falcon@freecalypso.org>
date Sat, 01 Oct 2022 15:54:50 -0800
parents d74b545a3c2a
children
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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 <unistd.h>
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14 #include "../libsip/parse.h"
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15 #include "../libsip/out_msg.h"
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16
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17 extern struct in_addr sip_bind_ip;
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18 extern unsigned sip_bind_port;
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19
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20 int sip_socket;
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21
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22 open_sip_udp_socket()
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23 {
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24 struct sockaddr_in sin;
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25 int rc;
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26
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27 sip_socket = socket(AF_INET, SOCK_DGRAM, 0);
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28 if (sip_socket < 0) {
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29 perror("socket(AF_INET, SOCK_DGRAM, 0)");
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30 exit(1);
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31 }
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32 sin.sin_family = AF_INET;
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33 sin.sin_addr = sip_bind_ip;
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34 sin.sin_port = htons(sip_bind_port);
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35 rc = bind(sip_socket, (struct sockaddr *) &sin, sizeof sin);
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36 if (rc < 0) {
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37 perror("bind of SIP UDP socket");
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38 exit(1);
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39 }
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40 return(0);
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41 }
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42
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43 void
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44 sip_socket_select()
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45 {
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46 struct sip_pkt_rx pkt;
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47 struct sockaddr_in sin;
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48 socklen_t addrlen;
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49 int rc;
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50
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51 addrlen = sizeof sin;
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52 rc = recvfrom(sip_socket, pkt.pkt_buffer, MAX_SIP_RX_PACKET, 0,
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53 (struct sockaddr *) &sin, &addrlen);
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54 if (rc <= 0) {
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55 perror("recvfrom");
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56 return;
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57 }
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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 printf("Incoming SIP UDP message parse error %d\n", rc);
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63 return;
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64 }
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65 /* dispatch good-so-far SIP message */
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66 if (pkt.parse_msgtype == SIP_MSG_TYPE_REQ)
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67 process_sip_request(&pkt, &sin);
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68 else if (pkt.parse_msgtype == SIP_MSG_TYPE_RESP)
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69 process_sip_response(&pkt, &sin);
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70 }
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72 void
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73 sip_tx_packet(msg, sin)
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74 struct sip_msg_out *msg;
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75 struct sockaddr_in *sin;
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76 {
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77 socklen_t addrlen;
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78
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79 addrlen = sizeof(struct sockaddr_in);
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80 sendto(sip_socket, msg->buf, msg->msg_len, 0, (struct sockaddr *) sin,
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81 addrlen);
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82 log_sip_msg_tx(msg->buf, msg->msg_len, sin);
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83 }