test/udp/conn2send/udp_conn2send.c

   1 #include <sys/types.h>
   2 #include <sys/socket.h>
   3
   4 #include <arpa/inet.h>
   5 #include <netinet/in.h>
   6
   7 #include <err.h>
   8 #include <errno.h>
   9 #include <stdio.h>
  10 #include <stdint.h>
  11 #include <stdlib.h>
  12 #include <string.h>
  13 #include <unistd.h>
  14
  15 static void
  16 usage(const char *cmd)
  17 {
  18         fprintf(stderr, "%s -4 ip4 -p port [-r]\n", cmd);
  19         exit(1);
  20 }
  21
  22 int
  23 main(int argc, char *argv[])
  24 {
  25         struct sockaddr_in in, in2;
  26         int s, opt, n, reuseport;
  27         uint8_t buf[18];
  28
  29         memset(&in, 0, sizeof(in));
  30         in.sin_family = AF_INET;
  31
  32         reuseport = 0;
  33
  34         while ((opt = getopt(argc, argv, "4:p:r")) != -1) {
  35                 switch (opt) {
  36                 case '4':
  37                         if (inet_pton(AF_INET, optarg, &in.sin_addr) <= 0)
  38                                 usage(argv[0]);
  39                         break;
  40
  41                 case 'p':
  42                         in.sin_port = strtol(optarg, NULL, 10);
  43                         in.sin_port = htons(in.sin_port);
  44                         break;
  45
  46                 case 'r':
  47                         reuseport = 1;
  48                         break;
  49
  50                 default:
  51                         usage(argv[0]);
  52                 }
  53         }
  54
  55         if (in.sin_addr.s_addr == INADDR_ANY || in.sin_port == 0)
  56                 usage(argv[0]);
  57
  58         s = socket(AF_INET, SOCK_DGRAM, 0);
  59         if (s < 0)
  60                 err(2, "socket failed");
  61
  62         if (reuseport) {
  63                 if (setsockopt(s, SOL_SOCKET, SO_REUSEPORT,
  64                     &reuseport, sizeof(reuseport)) < 0)
  65                         err(2, "setsockopt SO_REUSEPORT failed");
  66         }
  67
  68         if (connect(s, (const struct sockaddr *)&in, sizeof(in)) < 0)
  69                 err(2, "connect failed");
  70
  71         memset(&in2, 0, sizeof(in2));
  72         in2.sin_family = AF_UNSPEC;
  73         if (connect(s, (const struct sockaddr *)&in2, sizeof(in2)) < 0) {
  74                 int error = errno;
  75
  76                 if (error != EAFNOSUPPORT)
  77                         errc(2, error, "di-connect failed");
  78         }
  79
  80         n = sendto(s, buf, sizeof(buf), 0,
  81             (const struct sockaddr *)&in, sizeof(in));
  82         if (n < 0)
  83                 err(2, "sendto failed");
  84         else if (n != (int)sizeof(buf))
  85                 errx(2, "sent truncated data %d", n);
  86
  87         n = read(s, buf, sizeof(buf));
  88         if (n < 0)
  89                 err(2, "read failed");
  90         printf("read %d, done\n", n);
  91
  92         exit(0);
  93 }