tools/ncb.c

   1 #include <stdlib.h>
   2 #include <unistd.h>
   3 #include <sys/socket.h>
   4 #include <linux/in.h>
   5
   6 int main (int argc, char *argv[])
   7 {
   8         int s, len, o, port = 6666;
   9         char buf[512];
  10         struct sockaddr_in addr;
  11         int addr_len = sizeof addr;
  12
  13         if (argc > 1)
  14                 port = atoi (argv[1]);
  15
  16         s = socket (PF_INET, SOCK_DGRAM, IPPROTO_UDP);
  17
  18         o = 1;
  19         len = 4;
  20         setsockopt (3, SOL_SOCKET, SO_REUSEADDR, &o, len);
  21
  22         addr.sin_family = AF_INET;
  23         addr.sin_port = htons (port);
  24         addr.sin_addr.s_addr = INADDR_ANY;      /* receive broadcasts */
  25
  26         bind (s, (struct sockaddr *) &addr, sizeof addr);
  27
  28         for (;;) {
  29                 len = recvfrom (s, buf, sizeof buf, 0, (struct sockaddr *) &addr, &addr_len);
  30                 if (len < 0)
  31                         break;
  32                 write (1, buf, len);
  33         }
  34
  35         return 0;
  36 }