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annotate sip-manual-out/sip_udp.c @ 171:4f1f3f799295

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doc/Codec-library-depend: article written
author Mychaela Falconia <falcon@freecalypso.org>
date Mon, 21 Nov 2022 01:01:39 -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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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 }