git.ozlabs.org Git - ccan/blob - ccan/net/_info

   1 #include <string.h>
   2 #include "config.h"
   3
   4 /**
   5  * net - simple IPv4/IPv6 client library
   6  *
   7  * This code makes it simple to support IPv4 and IPv6 without speed penalty.
   8  *
   9  * License: MIT
  10  *
  11  * Author: Rusty Russell <rusty@rustcorp.com.au>
  12  *
  13  * Example:
  14  *      #include <ccan/net/net.h>
  15  *      #include <sys/types.h>
  16  *      #include <sys/socket.h>
  17  *      #include <netinet/in.h>
  18  *      #include <stdio.h>
  19  *      #include <err.h>
  20  *
  21  *      int main(int argc, char *argv[])
  22  *      {
  23  *              struct addrinfo *addr;
  24  *              const char *dest, *port;
  25  *              int fd;
  26  *              union {
  27  *                      struct sockaddr s;
  28  *                      struct sockaddr_in v4;
  29  *                      struct sockaddr_in6 v6;
  30  *              } u;
  31  *              socklen_t slen = sizeof(u);
  32  *
  33  *              if (argc == 2) {
  34  *                      dest = argv[1];
  35  *                      port = "http";
  36  *              } else if (argc == 3) {
  37  *                      dest = argv[1];
  38  *                      port = argv[2];
  39  *              } else
  40  *                      errx(1, "Usage: test-net <target> [<port>]");
  41  *
  42  *              addr = net_client_lookup(dest, port, AF_UNSPEC, SOCK_STREAM);
  43  *              if (!addr)
  44  *                      err(1, "Failed to look up %s", dest);
  45  *
  46  *              fd = net_connect(addr);
  47  *              if (fd < 0)
  48  *                      err(1, "Failed to connect to %s", dest);
  49  *
  50  *              if (getsockname(fd, &u.s, &slen) == 0)
  51  *                      printf("Connected via %s\n",
  52  *                             u.s.sa_family == AF_INET6 ? "IPv6"
  53  *                             : u.s.sa_family == AF_INET ? "IPv4"
  54  *                             : "UNKNOWN??");
  55  *              else
  56  *                      err(1, "Failed to get socket type for connection");
  57  *              return 0;
  58  *      }
  59  */
  60 int main(int argc, char *argv[])
  61 {
  62         /* Expect exactly one argument */
  63         if (argc != 2)
  64                 return 1;
  65
  66         if (strcmp(argv[1], "depends") == 0) {
  67                 return 0;
  68         }
  69
  70         return 1;
  71 }