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annotate net-traffic/udp-test-sink.c @ 17:ab18adf989e3 default tip

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pcm-study: new program pcm16-frag-extr
author Mychaela Falconia <falcon@freecalypso.org>
date Tue, 29 Oct 2024 00:32:33 +0000
parents e686bc92c7d8
children
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9
c00510e1ae8b new program udp-test-sink
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1 /*
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2 * This program is a simple sink for UDP: it binds to a UDP port and sinks
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3 * (reads and discards) all packets that arrive at it. Upon receiving a
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4 * burst or stream of packets followed by a prolonged pause, it prints
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5 * the number of packets that were received.
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6 */
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7
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8 #include <sys/types.h>
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9 #include <sys/socket.h>
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10 #include <sys/time.h>
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11 #include <sys/errno.h>
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12 #include <netinet/in.h>
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13 #include <arpa/inet.h>
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14 #include <stdio.h>
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15 #include <stdlib.h>
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16 #include <string.h>
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17 #include <strings.h>
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18 #include <unistd.h>
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19
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20 static void
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21 parse_ip_port(arg, sin)
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22 char *arg;
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23 struct sockaddr_in *sin;
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24 {
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25 char *cp;
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26 int rc;
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27
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28 cp = index(arg, ':');
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29 if (!cp) {
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30 fprintf(stderr, "error: missing ':' in IP:port argument\n");
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31 exit(1);
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32 }
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33 *cp++ = '\0';
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34 sin->sin_family = AF_INET;
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35 rc = inet_aton(arg, &sin->sin_addr);
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36 if (!rc) {
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37 fprintf(stderr, "error: invalid IP address argument\n");
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38 exit(1);
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39 }
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40 sin->sin_port = htons(atoi(cp));
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41 }
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42
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43 main(argc, argv)
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44 char **argv;
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45 {
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46 struct sockaddr_in bindsin;
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47 int udp_fd, rc;
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48 unsigned idle_sec, rx_count;
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49 fd_set fds;
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50 struct timeval tv;
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51 u_char dummybuf[256];
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52
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53 if (argc < 2 || argc > 3) {
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54 fprintf(stderr, "usage: bind-IP:port [idle-sec]\n", argv[0]);
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55 exit(1);
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56 }
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57 parse_ip_port(argv[1], &bindsin);
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58 if (argc >= 3)
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59 idle_sec = atoi(argv[2]);
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60 else
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61 idle_sec = 0;
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62 udp_fd = socket(AF_INET, SOCK_DGRAM, 0);
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63 if (udp_fd < 0) {
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64 perror("socket(AF_INET, SOCK_DGRAM, 0)");
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65 exit(1);
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66 }
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67 rc = bind(udp_fd, (struct sockaddr *) &bindsin, sizeof bindsin);
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68 if (rc < 0) {
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69 perror("bind");
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70 exit(1);
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71 }
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72 for (rx_count = 0; ; ) {
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73 FD_ZERO(&fds);
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74 FD_SET(udp_fd, &fds);
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75 if (rx_count && idle_sec) {
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76 tv.tv_sec = idle_sec;
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77 tv.tv_usec = 0;
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78 rc = select(udp_fd+1, &fds, 0, 0, &tv);
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79 } else
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80 rc = select(udp_fd+1, &fds, 0, 0, 0);
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81 if (rc < 0) {
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82 if (errno == EINTR)
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83 continue;
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84 perror("select");
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85 exit(1);
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86 }
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87 if (FD_ISSET(udp_fd, &fds)) {
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88 recv(udp_fd, dummybuf, sizeof dummybuf, 0);
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89 rx_count++;
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90 } else {
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91 printf("Received %u packet%s\n", rx_count,
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92 rx_count != 1 ? "s" : "");
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93 rx_count = 0;
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94 }
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95 }
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96 }