FreeCalypso > hg > themwi-rtp-lib

annotate src/bind_fdpair.c @ 17:2a24487453a7

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implement twrtp_bind_fdpair()
author Mychaela Falconia <falcon@freecalypso.org>
date Sun, 07 Jul 2024 00:02:44 +0000
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2a24487453a7 implement twrtp_bind_fdpair()
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1 /*
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2 * Here we implement the function that creates and binds a pair of
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3 * UDP sockets for RTP & RTCP, given the bind IP address in string form
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4 * and the even port number in integer form.
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5 *
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6 * The current implementation supports only IPv4; however, given that
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7 * the API takes a string for the IP address, it should be possible
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8 * to extend this function to support IPv6 if and when such support
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9 * becomes necessary.
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10 */
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11
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12 #include <sys/types.h>
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13 #include <sys/socket.h>
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14 #include <netinet/in.h>
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15 #include <arpa/inet.h>
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16 #include <stdint.h>
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17 #include <unistd.h>
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18 #include <errno.h>
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19
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20 #include <themwi/rtp/fdpair.h>
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21
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22 int twrtp_bind_fdpair(const char *ip, uint16_t port, int *fd_rtp, int *fd_rtcp)
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23 {
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24 struct sockaddr_in sin;
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25 int rc;
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26
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27 sin.sin_family = AF_INET;
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28 rc = inet_aton(ip, &sin.sin_addr);
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29 if (!rc)
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30 return -EINVAL;
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31
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32 /* do RTP socket first */
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33 rc = socket(AF_INET, SOCK_DGRAM, 0);
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34 if (rc < 0)
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35 return -errno;
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36 *fd_rtp = rc;
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37 sin.sin_port = htons(port);
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38 rc = bind(*fd_rtp, (struct sockaddr *) &sin, sizeof sin);
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39 if (rc < 0) {
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40 rc = -errno;
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41 close(*fd_rtp);
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42 return rc;
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43 }
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44
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45 /* now do RTCP */
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46 rc = socket(AF_INET, SOCK_DGRAM, 0);
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47 if (rc < 0) {
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48 rc = -errno;
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49 close(*fd_rtp);
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50 return rc;
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51 }
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52 *fd_rtcp = rc;
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53 sin.sin_port = htons(port + 1);
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54 rc = bind(*fd_rtcp, (struct sockaddr *) &sin, sizeof sin);
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55 if (rc < 0) {
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56 rc = -errno;
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57 close(*fd_rtp);
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58 close(*fd_rtcp);
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59 return rc;
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60 }
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61
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62 return 0;
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63 }