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annotate rtp-mgr/alloc.c @ 179:b79d6334f543

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themwi-rtp-mgr: RTP port allocation split out of themwi-mgw
author Mychaela Falconia <falcon@freecalypso.org>
date Sat, 11 Mar 2023 20:19:14 -0800
parents mgw/crcx.c@f062c32a5116
children
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Mychaela Falconia <falcon@freecalypso.org>
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1 /*
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2 * In this module we implement our RTP port allocation operation.
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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 <sys/time.h>
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8 #include <netinet/in.h>
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9 #include <arpa/inet.h>
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10 #include <stdio.h>
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11 #include <stdint.h>
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12 #include <stdlib.h>
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13 #include <string.h>
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14 #include <strings.h>
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15 #include <syslog.h>
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16 #include <unistd.h>
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17 #include "../include/tmgw_const.h"
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18 #include "struct.h"
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19 #include "select.h"
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20
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21 get_rtp_port_pair(roe, brc)
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22 struct rtp_one_end *roe;
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23 struct bind_range_cfg *brc;
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24 {
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25 struct sockaddr_in sin;
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26 unsigned tries, rtp_port;
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27 int rc;
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28
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29 sin.sin_family = AF_INET;
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30 sin.sin_addr = brc->bind_ip;
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31 for (tries = brc->port_tries; tries; tries--) {
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32 rtp_port = brc->port_next;
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33 brc->port_next += 2;
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34 if (brc->port_next >= brc->port_range_end)
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35 brc->port_next = brc->port_range_start;
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36 sin.sin_port = htons(rtp_port);
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37 roe->rtp_fd = socket(AF_INET, SOCK_DGRAM, 0);
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38 if (roe->rtp_fd < 0) {
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39 syslog(LOG_CRIT, "socket(AF_INET, SOCK_DGRAM, 0): %m");
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40 return(-1);
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41 }
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42 rc = bind(roe->rtp_fd, (struct sockaddr *) &sin, sizeof sin);
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43 if (rc < 0) {
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44 close(roe->rtp_fd);
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45 continue;
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46 }
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47 bcopy(&sin, &roe->bound_addr, sizeof(struct sockaddr_in));
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48 sin.sin_port = htons(rtp_port+1);
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49 roe->rtcp_fd = socket(AF_INET, SOCK_DGRAM, 0);
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50 if (roe->rtcp_fd < 0) {
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51 syslog(LOG_CRIT, "socket(AF_INET, SOCK_DGRAM, 0): %m");
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52 close(roe->rtp_fd);
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53 return(-1);
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54 }
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55 rc = bind(roe->rtcp_fd, (struct sockaddr *) &sin, sizeof sin);
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56 if (rc < 0) {
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57 close(roe->rtp_fd);
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58 close(roe->rtcp_fd);
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59 continue;
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60 }
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61 /* all good! */
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62 return(0);
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63 }
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64 /* couldn't find a free port pair */
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65 return(-1);
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66 }