test/udp/connsend/udp_connsend.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 <stdio.h>
   9 #include <stdint.h>
  10 #include <stdlib.h>
  11 #include <string.h>
  12 #include <unistd.h>
  13
  14 static void
  15 usage(const char *cmd)
  16 {
  17         fprintf(stderr, "%s -4 ip4 -p port\n", cmd);
  18         exit(1);
  19 }
  20
  21 int
  22 main(int argc, char *argv[])
  23 {
  24         struct sockaddr_in in;
  25         int s, opt, n;
  26         uint8_t buf[18];
  27
  28         memset(&in, 0, sizeof(in));
  29         in.sin_family = AF_INET;
  30
  31         while ((opt = getopt(argc, argv, "4:p:")) != -1) {
  32                 switch (opt) {
  33                 case '4':
  34                         if (inet_pton(AF_INET, optarg, &in.sin_addr) <= 0)
  35                                 usage(argv[0]);
  36                         break;
  37
  38                 case 'p':
  39                         in.sin_port = strtol(optarg, NULL, 10);
  40                         in.sin_port = htons(in.sin_port);
  41                         break;
  42
  43                 default:
  44                         usage(argv[0]);
  45                 }
  46         }
  47
  48         if (in.sin_addr.s_addr == INADDR_ANY || in.sin_port == 0)
  49                 usage(argv[0]);
  50
  51         s = socket(AF_INET, SOCK_DGRAM, 0);
  52         if (s < 0)
  53                 err(2, "socket failed");
  54
  55         if (connect(s, (const struct sockaddr *)&in, sizeof(in)) < 0)
  56                 err(2, "connect failed");
  57
  58         n = write(s, buf, sizeof(buf));
  59         if (n < 0)
  60                 err(2, "write failed");
  61         else if (n != (int)sizeof(buf))
  62                 errx(2, "written truncated data %d", n);
  63
  64         n = read(s, buf, sizeof(buf));
  65         if (n < 0)
  66                 err(2, "read failed");
  67         printf("read %d, done\n", n);
  68
  69         exit(0);
  70 }