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annotate mgw/crcx.c @ 34:7dae2bae56a1

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themwi-mgw: implement MDCX parameter validation
author Mychaela Falconia <falcon@freecalypso.org>
date Sat, 09 Jul 2022 23:17:15 -0800
parents b3f74df7b808
children 020ba624bdd8
Ignore whitespace changes - Everywhere: Within whitespace: At end of lines:
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32
b3f74df7b808 beginning of themwi-mgw
Mychaela Falconia <falcon@freecalypso.org>
parents:
diff changeset
1 /*
b3f74df7b808 beginning of themwi-mgw
Mychaela Falconia <falcon@freecalypso.org>
parents:
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2 * In this module we implement our CRCX operation.
b3f74df7b808 beginning of themwi-mgw
Mychaela Falconia <falcon@freecalypso.org>
parents:
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3 */
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Mychaela Falconia <falcon@freecalypso.org>
parents:
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4
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Mychaela Falconia <falcon@freecalypso.org>
parents:
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5 #include <sys/types.h>
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Mychaela Falconia <falcon@freecalypso.org>
parents:
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6 #include <sys/socket.h>
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Mychaela Falconia <falcon@freecalypso.org>
parents:
diff changeset
7 #include <netinet/in.h>
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Mychaela Falconia <falcon@freecalypso.org>
parents:
diff changeset
8 #include <arpa/inet.h>
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Mychaela Falconia <falcon@freecalypso.org>
parents:
diff changeset
9 #include <stdio.h>
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Mychaela Falconia <falcon@freecalypso.org>
parents:
diff changeset
10 #include <stdlib.h>
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Mychaela Falconia <falcon@freecalypso.org>
parents:
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11 #include <string.h>
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Mychaela Falconia <falcon@freecalypso.org>
parents:
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12 #include <strings.h>
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Mychaela Falconia <falcon@freecalypso.org>
parents:
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13 #include <syslog.h>
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Mychaela Falconia <falcon@freecalypso.org>
parents:
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14 #include <unistd.h>
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Mychaela Falconia <falcon@freecalypso.org>
parents:
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15 #include "../include/tmgw_ctrl.h"
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Mychaela Falconia <falcon@freecalypso.org>
parents:
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16 #include "../include/tmgw_const.h"
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Mychaela Falconia <falcon@freecalypso.org>
parents:
diff changeset
17 #include "struct.h"
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Mychaela Falconia <falcon@freecalypso.org>
parents:
diff changeset
18 #include "select.h"
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Mychaela Falconia <falcon@freecalypso.org>
parents:
diff changeset
19
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Mychaela Falconia <falcon@freecalypso.org>
parents:
diff changeset
20 extern struct endpoint *find_ep_by_id();
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Mychaela Falconia <falcon@freecalypso.org>
parents:
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21 extern void udp_sink_rcvr();
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Mychaela Falconia <falcon@freecalypso.org>
parents:
diff changeset
22
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Mychaela Falconia <falcon@freecalypso.org>
parents:
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23 extern struct bind_range_cfg bind_range_gsm, bind_range_pstn;
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Mychaela Falconia <falcon@freecalypso.org>
parents:
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24
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Mychaela Falconia <falcon@freecalypso.org>
parents:
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25 static unsigned
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Mychaela Falconia <falcon@freecalypso.org>
parents:
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26 get_new_ep_id(conn)
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Mychaela Falconia <falcon@freecalypso.org>
parents:
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27 struct ctrl_conn *conn;
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Mychaela Falconia <falcon@freecalypso.org>
parents:
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28 {
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Mychaela Falconia <falcon@freecalypso.org>
parents:
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29 unsigned id;
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Mychaela Falconia <falcon@freecalypso.org>
parents:
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30
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Mychaela Falconia <falcon@freecalypso.org>
parents:
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31 for (;;) {
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Mychaela Falconia <falcon@freecalypso.org>
parents:
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32 id = conn->next_ep_id++;
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Mychaela Falconia <falcon@freecalypso.org>
parents:
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33 if (!find_ep_by_id(conn, id))
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Mychaela Falconia <falcon@freecalypso.org>
parents:
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34 return id;
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Mychaela Falconia <falcon@freecalypso.org>
parents:
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35 }
b3f74df7b808 beginning of themwi-mgw
Mychaela Falconia <falcon@freecalypso.org>
parents:
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36 }
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Mychaela Falconia <falcon@freecalypso.org>
parents:
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37
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Mychaela Falconia <falcon@freecalypso.org>
parents:
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38 static int
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Mychaela Falconia <falcon@freecalypso.org>
parents:
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39 get_local_port_pair(ep, roe, brc)
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Mychaela Falconia <falcon@freecalypso.org>
parents:
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40 struct endpoint *ep;
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Mychaela Falconia <falcon@freecalypso.org>
parents:
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41 struct rtp_one_end *roe;
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Mychaela Falconia <falcon@freecalypso.org>
parents:
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42 struct bind_range_cfg *brc;
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Mychaela Falconia <falcon@freecalypso.org>
parents:
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43 {
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Mychaela Falconia <falcon@freecalypso.org>
parents:
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44 struct sockaddr_in sin;
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Mychaela Falconia <falcon@freecalypso.org>
parents:
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45 unsigned tries, rtp_port;
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Mychaela Falconia <falcon@freecalypso.org>
parents:
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46 int rc;
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Mychaela Falconia <falcon@freecalypso.org>
parents:
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47
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Mychaela Falconia <falcon@freecalypso.org>
parents:
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48 sin.sin_family = AF_INET;
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Mychaela Falconia <falcon@freecalypso.org>
parents:
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49 sin.sin_addr = brc->bind_ip;
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Mychaela Falconia <falcon@freecalypso.org>
parents:
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50 for (tries = brc->port_tries; tries; tries--) {
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Mychaela Falconia <falcon@freecalypso.org>
parents:
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51 rtp_port = brc->port_next;
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Mychaela Falconia <falcon@freecalypso.org>
parents:
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52 brc->port_next += 2;
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Mychaela Falconia <falcon@freecalypso.org>
parents:
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53 if (brc->port_next >= brc->port_range_end)
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Mychaela Falconia <falcon@freecalypso.org>
parents:
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54 brc->port_next = brc->port_range_start;
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Mychaela Falconia <falcon@freecalypso.org>
parents:
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55 sin.sin_port = htons(rtp_port);
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Mychaela Falconia <falcon@freecalypso.org>
parents:
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56 roe->rtp_fd = socket(AF_INET, SOCK_DGRAM, 0);
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Mychaela Falconia <falcon@freecalypso.org>
parents:
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57 if (roe->rtp_fd < 0) {
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Mychaela Falconia <falcon@freecalypso.org>
parents:
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58 syslog(LOG_CRIT, "socket(AF_INET, SOCK_DGRAM, 0): %m");
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Mychaela Falconia <falcon@freecalypso.org>
parents:
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59 return(-1);
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Mychaela Falconia <falcon@freecalypso.org>
parents:
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60 }
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Mychaela Falconia <falcon@freecalypso.org>
parents:
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61 rc = bind(roe->rtp_fd, (struct sockaddr *) &sin, sizeof sin);
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Mychaela Falconia <falcon@freecalypso.org>
parents:
diff changeset
62 if (rc < 0) {
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Mychaela Falconia <falcon@freecalypso.org>
parents:
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63 close(roe->rtp_fd);
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Mychaela Falconia <falcon@freecalypso.org>
parents:
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64 continue;
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Mychaela Falconia <falcon@freecalypso.org>
parents:
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65 }
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Mychaela Falconia <falcon@freecalypso.org>
parents:
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66 bcopy(&sin, &roe->bound_addr, sizeof(struct sockaddr_in));
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Mychaela Falconia <falcon@freecalypso.org>
parents:
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67 sin.sin_port = htons(rtp_port+1);
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Mychaela Falconia <falcon@freecalypso.org>
parents:
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68 roe->rtcp_fd = socket(AF_INET, SOCK_DGRAM, 0);
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Mychaela Falconia <falcon@freecalypso.org>
parents:
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69 if (roe->rtcp_fd < 0) {
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Mychaela Falconia <falcon@freecalypso.org>
parents:
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70 syslog(LOG_CRIT, "socket(AF_INET, SOCK_DGRAM, 0): %m");
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Mychaela Falconia <falcon@freecalypso.org>
parents:
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71 close(roe->rtp_fd);
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Mychaela Falconia <falcon@freecalypso.org>
parents:
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72 return(-1);
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Mychaela Falconia <falcon@freecalypso.org>
parents:
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73 }
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Mychaela Falconia <falcon@freecalypso.org>
parents:
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74 rc = bind(roe->rtcp_fd, (struct sockaddr *) &sin, sizeof sin);
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Mychaela Falconia <falcon@freecalypso.org>
parents:
diff changeset
75 if (rc < 0) {
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Mychaela Falconia <falcon@freecalypso.org>
parents:
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76 close(roe->rtp_fd);
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Mychaela Falconia <falcon@freecalypso.org>
parents:
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77 close(roe->rtcp_fd);
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Mychaela Falconia <falcon@freecalypso.org>
parents:
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78 continue;
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Mychaela Falconia <falcon@freecalypso.org>
parents:
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79 }
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Mychaela Falconia <falcon@freecalypso.org>
parents:
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80 /* all good - make the file descriptors live for select */
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Mychaela Falconia <falcon@freecalypso.org>
parents:
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81 update_max_fd(roe->rtp_fd);
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Mychaela Falconia <falcon@freecalypso.org>
parents:
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82 FD_SET(roe->rtp_fd, &select_for_read);
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Mychaela Falconia <falcon@freecalypso.org>
parents:
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83 select_handlers[roe->rtp_fd] = udp_sink_rcvr;
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Mychaela Falconia <falcon@freecalypso.org>
parents:
diff changeset
84 select_data[roe->rtp_fd] = (void *) ep;
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Mychaela Falconia <falcon@freecalypso.org>
parents:
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85 update_max_fd(roe->rtcp_fd);
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Mychaela Falconia <falcon@freecalypso.org>
parents:
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86 FD_SET(roe->rtcp_fd, &select_for_read);
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Mychaela Falconia <falcon@freecalypso.org>
parents:
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87 select_handlers[roe->rtcp_fd] = udp_sink_rcvr;
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Mychaela Falconia <falcon@freecalypso.org>
parents:
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88 select_data[roe->rtcp_fd] = (void *) ep;
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Mychaela Falconia <falcon@freecalypso.org>
parents:
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89 return(0);
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Mychaela Falconia <falcon@freecalypso.org>
parents:
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90 }
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Mychaela Falconia <falcon@freecalypso.org>
parents:
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91 /* couldn't find a free port pair */
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Mychaela Falconia <falcon@freecalypso.org>
parents:
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92 return(-1);
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Mychaela Falconia <falcon@freecalypso.org>
parents:
diff changeset
93 }
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Mychaela Falconia <falcon@freecalypso.org>
parents:
diff changeset
94
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Mychaela Falconia <falcon@freecalypso.org>
parents:
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95 void
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Mychaela Falconia <falcon@freecalypso.org>
parents:
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96 process_crcx(conn, req, resp)
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Mychaela Falconia <falcon@freecalypso.org>
parents:
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97 struct ctrl_conn *conn;
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Mychaela Falconia <falcon@freecalypso.org>
parents:
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98 struct tmgw_ctrl_req *req;
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Mychaela Falconia <falcon@freecalypso.org>
parents:
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99 struct tmgw_ctrl_resp *resp;
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Mychaela Falconia <falcon@freecalypso.org>
parents:
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100 {
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Mychaela Falconia <falcon@freecalypso.org>
parents:
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101 struct endpoint *ep;
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Mychaela Falconia <falcon@freecalypso.org>
parents:
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102 int rc;
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Mychaela Falconia <falcon@freecalypso.org>
parents:
diff changeset
103
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Mychaela Falconia <falcon@freecalypso.org>
parents:
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104 /* ep_id in request encodes ep_type */
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Mychaela Falconia <falcon@freecalypso.org>
parents:
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105 switch (req->ep_id) {
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Mychaela Falconia <falcon@freecalypso.org>
parents:
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106 case TMGW_EP_TYPE_DUMMY_GSM:
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Mychaela Falconia <falcon@freecalypso.org>
parents:
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107 case TMGW_EP_TYPE_DUMMY_PSTN:
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Mychaela Falconia <falcon@freecalypso.org>
parents:
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108 case TMGW_EP_TYPE_GATEWAY:
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Mychaela Falconia <falcon@freecalypso.org>
parents:
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109 break;
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Mychaela Falconia <falcon@freecalypso.org>
parents:
diff changeset
110 default:
34
7dae2bae56a1 themwi-mgw: implement MDCX parameter validation
Mychaela Falconia <falcon@freecalypso.org>
parents: 32
diff changeset
111 resp->res = TMGW_RESP_ERR_PARAM;
32
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Mychaela Falconia <falcon@freecalypso.org>
parents:
diff changeset
112 return;
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Mychaela Falconia <falcon@freecalypso.org>
parents:
diff changeset
113 }
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Mychaela Falconia <falcon@freecalypso.org>
parents:
diff changeset
114 ep = malloc(sizeof(struct endpoint));
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Mychaela Falconia <falcon@freecalypso.org>
parents:
diff changeset
115 if (!ep) {
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Mychaela Falconia <falcon@freecalypso.org>
parents:
diff changeset
116 syslog(LOG_CRIT, "malloc for endpoint: %m");
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Mychaela Falconia <falcon@freecalypso.org>
parents:
diff changeset
117 resp->res = TMGW_RESP_ERR_RSRC;
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Mychaela Falconia <falcon@freecalypso.org>
parents:
diff changeset
118 return;
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Mychaela Falconia <falcon@freecalypso.org>
parents:
diff changeset
119 }
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Mychaela Falconia <falcon@freecalypso.org>
parents:
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120 bzero(ep, sizeof(struct endpoint));
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Mychaela Falconia <falcon@freecalypso.org>
parents:
diff changeset
121 ep->ep_type = req->ep_id;
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Mychaela Falconia <falcon@freecalypso.org>
parents:
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122 ep->ep_id = get_new_ep_id(conn);
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Mychaela Falconia <falcon@freecalypso.org>
parents:
diff changeset
123 if (ep->ep_type & TMGW_EP_HAS_GSM_SOCK) {
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Mychaela Falconia <falcon@freecalypso.org>
parents:
diff changeset
124 rc = get_local_port_pair(ep, &ep->rtp_gsm, &bind_range_gsm);
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Mychaela Falconia <falcon@freecalypso.org>
parents:
diff changeset
125 if (rc < 0) {
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Mychaela Falconia <falcon@freecalypso.org>
parents:
diff changeset
126 syslog(LOG_ERR,
b3f74df7b808 beginning of themwi-mgw
Mychaela Falconia <falcon@freecalypso.org>
parents:
diff changeset
127 "unable to get local port pair on GSM side");
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Mychaela Falconia <falcon@freecalypso.org>
parents:
diff changeset
128 free(ep);
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Mychaela Falconia <falcon@freecalypso.org>
parents:
diff changeset
129 resp->res = TMGW_RESP_ERR_RSRC;
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Mychaela Falconia <falcon@freecalypso.org>
parents:
diff changeset
130 return;
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Mychaela Falconia <falcon@freecalypso.org>
parents:
diff changeset
131 }
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Mychaela Falconia <falcon@freecalypso.org>
parents:
diff changeset
132 }
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Mychaela Falconia <falcon@freecalypso.org>
parents:
diff changeset
133 if (ep->ep_type & TMGW_EP_HAS_PSTN_SOCK) {
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Mychaela Falconia <falcon@freecalypso.org>
parents:
diff changeset
134 rc = get_local_port_pair(ep, &ep->rtp_pstn, &bind_range_pstn);
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Mychaela Falconia <falcon@freecalypso.org>
parents:
diff changeset
135 if (rc < 0) {
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Mychaela Falconia <falcon@freecalypso.org>
parents:
diff changeset
136 syslog(LOG_ERR,
b3f74df7b808 beginning of themwi-mgw
Mychaela Falconia <falcon@freecalypso.org>
parents:
diff changeset
137 "unable to get local port pair on PSTN side");
b3f74df7b808 beginning of themwi-mgw
Mychaela Falconia <falcon@freecalypso.org>
parents:
diff changeset
138 if (ep->ep_type & TMGW_EP_HAS_GSM_SOCK)
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Mychaela Falconia <falcon@freecalypso.org>
parents:
diff changeset
139 free_rtp_end(&ep->rtp_gsm);
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Mychaela Falconia <falcon@freecalypso.org>
parents:
diff changeset
140 free(ep);
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Mychaela Falconia <falcon@freecalypso.org>
parents:
diff changeset
141 resp->res = TMGW_RESP_ERR_RSRC;
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Mychaela Falconia <falcon@freecalypso.org>
parents:
diff changeset
142 return;
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Mychaela Falconia <falcon@freecalypso.org>
parents:
diff changeset
143 }
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Mychaela Falconia <falcon@freecalypso.org>
parents:
diff changeset
144 }
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Mychaela Falconia <falcon@freecalypso.org>
parents:
diff changeset
145 rc = mdcx_operation(ep, req, resp);
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Mychaela Falconia <falcon@freecalypso.org>
parents:
diff changeset
146 if (rc < 0) {
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Mychaela Falconia <falcon@freecalypso.org>
parents:
diff changeset
147 if (ep->ep_type & TMGW_EP_HAS_GSM_SOCK)
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Mychaela Falconia <falcon@freecalypso.org>
parents:
diff changeset
148 free_rtp_end(&ep->rtp_gsm);
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Mychaela Falconia <falcon@freecalypso.org>
parents:
diff changeset
149 if (ep->ep_type & TMGW_EP_HAS_PSTN_SOCK)
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Mychaela Falconia <falcon@freecalypso.org>
parents:
diff changeset
150 free_rtp_end(&ep->rtp_pstn);
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Mychaela Falconia <falcon@freecalypso.org>
parents:
diff changeset
151 free(ep);
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Mychaela Falconia <falcon@freecalypso.org>
parents:
diff changeset
152 return;
b3f74df7b808 beginning of themwi-mgw
Mychaela Falconia <falcon@freecalypso.org>
parents:
diff changeset
153 }
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Mychaela Falconia <falcon@freecalypso.org>
parents:
diff changeset
154 /* all good - accept the new endpoint and return OK */
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Mychaela Falconia <falcon@freecalypso.org>
parents:
diff changeset
155 ep->next = conn->endp_list;
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Mychaela Falconia <falcon@freecalypso.org>
parents:
diff changeset
156 conn->endp_list = ep;
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Mychaela Falconia <falcon@freecalypso.org>
parents:
diff changeset
157 resp->res = TMGW_RESP_OK;
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Mychaela Falconia <falcon@freecalypso.org>
parents:
diff changeset
158 resp->ep_id = ep->ep_id;
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Mychaela Falconia <falcon@freecalypso.org>
parents:
diff changeset
159 bcopy(&ep->rtp_gsm.bound_addr, &resp->gsm_addr,
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Mychaela Falconia <falcon@freecalypso.org>
parents:
diff changeset
160 sizeof(struct sockaddr_in));
b3f74df7b808 beginning of themwi-mgw
Mychaela Falconia <falcon@freecalypso.org>
parents:
diff changeset
161 bcopy(&ep->rtp_pstn.bound_addr, &resp->pstn_addr,
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Mychaela Falconia <falcon@freecalypso.org>
parents:
diff changeset
162 sizeof(struct sockaddr_in));
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Mychaela Falconia <falcon@freecalypso.org>
parents:
diff changeset
163 syslog(LOG_INFO, "CRCX endpoint type %u id %u", ep->ep_type, ep->ep_id);
b3f74df7b808 beginning of themwi-mgw
Mychaela Falconia <falcon@freecalypso.org>
parents:
diff changeset
164 }