test/udp/bindconnfail/udp_bindconnfail.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\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 s1, s2, opt, n, on = 1;
  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         while ((opt = getopt(argc, argv, "4:P:b:p:")) != -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                         local_in.sin_port = strtol(optarg, NULL, 10);
  43                         local_in.sin_port = htons(local_in.sin_port);
  44                         break;
  45
  46                 case 'b':
  47                         if (inet_pton(AF_INET, optarg, &local_in.sin_addr) <= 0)
  48                                 usage(argv[0]);
  49                         break;
  50
  51                 case 'p':
  52                         in.sin_port = strtol(optarg, NULL, 10);
  53                         in.sin_port = htons(in.sin_port);
  54                         break;
  55
  56                 default:
  57                         usage(argv[0]);
  58                 }
  59         }
  60
  61         if (in.sin_addr.s_addr == INADDR_ANY || in.sin_port == 0 ||
  62             local_in.sin_port == 0)
  63                 usage(argv[0]);
  64
  65         s1 = socket(AF_INET, SOCK_DGRAM, 0);
  66         if (s1 < 0)
  67                 err(2, "socket 1 failed");
  68
  69         if (setsockopt(s1, SOL_SOCKET, SO_REUSEPORT, &on, sizeof(on)) < 0)
  70                 err(2, "setsockopt 1 SO_REUSEPORT failed");
  71
  72         if (bind(s1, (const struct sockaddr *)&local_in, sizeof(local_in)) < 0)
  73                 err(2, "bind 1 failed");
  74
  75         if (connect(s1, (const struct sockaddr *)&in, sizeof(in)) < 0)
  76                 err(2, "connect 1 failed");
  77
  78         s2 = socket(AF_INET, SOCK_DGRAM, 0);
  79         if (s2 < 0)
  80                 err(2, "socket 2 failed");
  81
  82         if (setsockopt(s2, SOL_SOCKET, SO_REUSEPORT, &on, sizeof(on)) < 0)
  83                 err(2, "setsockopt 2 SO_REUSEPORT failed");
  84
  85         if (bind(s2, (const struct sockaddr *)&local_in, sizeof(local_in)) < 0)
  86                 err(2, "bind 2 failed");
  87
  88         if (connect(s2, (const struct sockaddr *)&in, sizeof(in)) == 0)
  89                 errx(2, "connect 2 succeeded");
  90
  91         close(s1);
  92
  93         n = sendto(s2, buf, sizeof(buf), 0,
  94             (const struct sockaddr *)&in, sizeof(in));
  95         if (n < 0)
  96                 err(2, "sendto failed");
  97         else if (n != (int)sizeof(buf))
  98                 errx(2, "sent truncated data %d", n);
  99
 100         n = read(s2, buf, sizeof(buf));
 101         if (n < 0)
 102                 err(2, "read failed");
 103         printf("read %d, done\n", n);
 104
 105         exit(0);
 106 }