test/udp/bindconnsend/udp_bindconnsend.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 [-b ip4] -P bind_port [-r]\n", cmd);
  18         exit(1);
  19 }
  20
  21 int
  22 main(int argc, char *argv[])
  23 {
  24         struct sockaddr_in in, local_in;
  25         int s, opt, n, reuseport;
  26         uint8_t buf[18];
  27
  28         memset(&in, 0, sizeof(in));
  29         in.sin_family = AF_INET;
  30
  31         memset(&local_in, 0, sizeof(local_in));
  32         local_in.sin_family = AF_INET;
  33
  34         reuseport = 0;
  35
  36         while ((opt = getopt(argc, argv, "4:P:b:p:r")) != -1) {
  37                 switch (opt) {
  38                 case '4':
  39                         if (inet_pton(AF_INET, optarg, &in.sin_addr) <= 0)
  40                                 usage(argv[0]);
  41                         break;
  42
  43                 case 'P':
  44                         local_in.sin_port = strtol(optarg, NULL, 10);
  45                         local_in.sin_port = htons(local_in.sin_port);
  46                         break;
  47
  48                 case 'b':
  49                         if (inet_pton(AF_INET, optarg, &local_in.sin_addr) <= 0)
  50                                 usage(argv[0]);
  51                         break;
  52
  53                 case 'p':
  54                         in.sin_port = strtol(optarg, NULL, 10);
  55                         in.sin_port = htons(in.sin_port);
  56                         break;
  57
  58                 case 'r':
  59                         reuseport = 1;
  60                         break;
  61
  62                 default:
  63                         usage(argv[0]);
  64                 }
  65         }
  66
  67         if (in.sin_addr.s_addr == INADDR_ANY || in.sin_port == 0 ||
  68             local_in.sin_port == 0)
  69                 usage(argv[0]);
  70
  71         s = socket(AF_INET, SOCK_DGRAM, 0);
  72         if (s < 0)
  73                 err(2, "socket failed");
  74
  75         if (reuseport) {
  76                 if (setsockopt(s, SOL_SOCKET, SO_REUSEPORT,
  77                     &reuseport, sizeof(reuseport)) < 0)
  78                         err(2, "setsockopt SO_REUSEPORT failed");
  79         }
  80
  81         if (bind(s, (const struct sockaddr *)&local_in, sizeof(local_in)) < 0)
  82                 err(2, "bind failed");
  83
  84         if (connect(s, (const struct sockaddr *)&in, sizeof(in)) < 0)
  85                 err(2, "connect failed");
  86
  87         n = write(s, buf, sizeof(buf));
  88         if (n < 0)
  89                 err(2, "write failed");
  90         else if (n != (int)sizeof(buf))
  91                 errx(2, "written truncated data %d", n);
  92
  93         n = read(s, buf, sizeof(buf));
  94         if (n < 0)
  95                 err(2, "read failed");
  96         printf("read %d, done\n", n);
  97
  98         exit(0);
  99 }