FreeCalypso > hg > themwi-system-sw
annotate sip-in/sip_udp.c @ 155:2730ccb44549
sip-out: initial UAC response handling
author | Mychaela Falconia <falcon@freecalypso.org> |
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date | Tue, 11 Oct 2022 23:30:00 -0800 |
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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); |
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90 log_sip_msg_tx(msg->buf, msg->msg_len, sin); |
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91 } |