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annotate sip-in/invite.c @ 48:8117d8ee44a5

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sip-in: beginning of INVITE handling
author Mychaela Falconia <falcon@freecalypso.org>
date Tue, 06 Sep 2022 22:07:51 -0800
parents
children dec31b1a8b96
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48
8117d8ee44a5 sip-in: beginning of INVITE handling
Mychaela Falconia <falcon@freecalypso.org>
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1 /*
8117d8ee44a5 sip-in: beginning of INVITE handling
Mychaela Falconia <falcon@freecalypso.org>
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2 * Here we implement our handling of SIP INVITE method.
8117d8ee44a5 sip-in: beginning of INVITE handling
Mychaela Falconia <falcon@freecalypso.org>
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3 */
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Mychaela Falconia <falcon@freecalypso.org>
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4
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Mychaela Falconia <falcon@freecalypso.org>
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5 #include <sys/types.h>
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Mychaela Falconia <falcon@freecalypso.org>
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6 #include <sys/socket.h>
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Mychaela Falconia <falcon@freecalypso.org>
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7 #include <netinet/in.h>
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Mychaela Falconia <falcon@freecalypso.org>
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8 #include <stdio.h>
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Mychaela Falconia <falcon@freecalypso.org>
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9 #include <stdlib.h>
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Mychaela Falconia <falcon@freecalypso.org>
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10 #include <string.h>
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Mychaela Falconia <falcon@freecalypso.org>
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11 #include <strings.h>
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Mychaela Falconia <falcon@freecalypso.org>
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12 #include <syslog.h>
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Mychaela Falconia <falcon@freecalypso.org>
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13 #include <unistd.h>
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Mychaela Falconia <falcon@freecalypso.org>
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14 #include "../libsip/parse.h"
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Mychaela Falconia <falcon@freecalypso.org>
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15 #include "../libsip/uas_basic.h"
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Mychaela Falconia <falcon@freecalypso.org>
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16 #include "../libsip/out_msg.h"
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Mychaela Falconia <falcon@freecalypso.org>
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17
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Mychaela Falconia <falcon@freecalypso.org>
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18 void
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Mychaela Falconia <falcon@freecalypso.org>
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19 handle_sip_invite(req, ess, sin)
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Mychaela Falconia <falcon@freecalypso.org>
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20 struct sip_pkt_rx *req;
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Mychaela Falconia <falcon@freecalypso.org>
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21 struct uas_parse_hdrs *ess;
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Mychaela Falconia <falcon@freecalypso.org>
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22 struct sockaddr_in *sin;
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Mychaela Falconia <falcon@freecalypso.org>
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23 {
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Mychaela Falconia <falcon@freecalypso.org>
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24 char uri_user[13], *called_nanp;
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Mychaela Falconia <falcon@freecalypso.org>
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25 struct sip_msg_out resp;
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Mychaela Falconia <falcon@freecalypso.org>
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26 int rc;
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Mychaela Falconia <falcon@freecalypso.org>
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27
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Mychaela Falconia <falcon@freecalypso.org>
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28 /* check for existing Call-ID will go here */
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Mychaela Falconia <falcon@freecalypso.org>
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29 /* extract called number from Request-URI */
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Mychaela Falconia <falcon@freecalypso.org>
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30 rc = user_from_sip_uri(req->req_uri, uri_user, 12);
8117d8ee44a5 sip-in: beginning of INVITE handling
Mychaela Falconia <falcon@freecalypso.org>
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31 if (rc < 0) {
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Mychaela Falconia <falcon@freecalypso.org>
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32 not_nanp: start_response_out_msg(&resp,
8117d8ee44a5 sip-in: beginning of INVITE handling
Mychaela Falconia <falcon@freecalypso.org>
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33 "416 Request-URI is not a NANP number");
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Mychaela Falconia <falcon@freecalypso.org>
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34 error_resp: rc = add_resp_basic_headers(&resp, ess, req->req_method);
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Mychaela Falconia <falcon@freecalypso.org>
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35 if (rc < 0) {
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Mychaela Falconia <falcon@freecalypso.org>
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36 syslog(LOG_ERR,
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Mychaela Falconia <falcon@freecalypso.org>
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37 "INVITE error response length exceeded");
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Mychaela Falconia <falcon@freecalypso.org>
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38 return;
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Mychaela Falconia <falcon@freecalypso.org>
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39 }
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Mychaela Falconia <falcon@freecalypso.org>
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40 out_msg_finish(&resp);
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Mychaela Falconia <falcon@freecalypso.org>
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41 sip_tx_packet(&resp, sin);
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Mychaela Falconia <falcon@freecalypso.org>
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42 return;
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Mychaela Falconia <falcon@freecalypso.org>
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43 }
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Mychaela Falconia <falcon@freecalypso.org>
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44 if (uri_user[0] == '+') {
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Mychaela Falconia <falcon@freecalypso.org>
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45 if (grok_number_string(uri_user+1, 0) != 11 ||
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Mychaela Falconia <falcon@freecalypso.org>
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46 uri_user[1] != '1')
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Mychaela Falconia <falcon@freecalypso.org>
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47 goto not_nanp;
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Mychaela Falconia <falcon@freecalypso.org>
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48 called_nanp = uri_user + 2;
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Mychaela Falconia <falcon@freecalypso.org>
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49 } else switch (grok_number_string(uri_user)) {
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Mychaela Falconia <falcon@freecalypso.org>
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50 case 10:
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Mychaela Falconia <falcon@freecalypso.org>
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51 called_nanp = uri_user;
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Mychaela Falconia <falcon@freecalypso.org>
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52 break;
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Mychaela Falconia <falcon@freecalypso.org>
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53 case 11:
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Mychaela Falconia <falcon@freecalypso.org>
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54 if (uri_user[0] != '1')
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Mychaela Falconia <falcon@freecalypso.org>
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55 goto not_nanp;
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Mychaela Falconia <falcon@freecalypso.org>
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56 called_nanp = uri_user + 1;
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Mychaela Falconia <falcon@freecalypso.org>
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57 break;
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Mychaela Falconia <falcon@freecalypso.org>
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58 default:
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Mychaela Falconia <falcon@freecalypso.org>
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59 goto not_nanp;
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Mychaela Falconia <falcon@freecalypso.org>
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60 }
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Mychaela Falconia <falcon@freecalypso.org>
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61 if (!is_nanp_valid_prefix(called_nanp))
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Mychaela Falconia <falcon@freecalypso.org>
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62 goto not_nanp;
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Mychaela Falconia <falcon@freecalypso.org>
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63 /* it is valid NANP - but is it one of ours? */
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Mychaela Falconia <falcon@freecalypso.org>
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64 refresh_number_db();
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Mychaela Falconia <falcon@freecalypso.org>
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65 if (!is_nanp_locally_owned(called_nanp)) {
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Mychaela Falconia <falcon@freecalypso.org>
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66 start_response_out_msg(&resp,
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Mychaela Falconia <falcon@freecalypso.org>
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67 "404 Called number does not belong here");
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Mychaela Falconia <falcon@freecalypso.org>
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68 goto error_resp;
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Mychaela Falconia <falcon@freecalypso.org>
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69 }
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Mychaela Falconia <falcon@freecalypso.org>
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70 /*
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Mychaela Falconia <falcon@freecalypso.org>
parents:
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71 * Remaining checks to be implemented:
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Mychaela Falconia <falcon@freecalypso.org>
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72 * Require and Supported headers
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Mychaela Falconia <falcon@freecalypso.org>
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73 * SDP message body
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Mychaela Falconia <falcon@freecalypso.org>
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74 */
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Mychaela Falconia <falcon@freecalypso.org>
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75 }