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