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   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 <stdio.h>
  18  *      #include <err.h>
  19  *
  20  *      int main(int argc, char *argv[])
  21  *      {
  22  *              struct addrinfo *addr;
  23  *              const char *dest, *port;
  24  *              int fd;
  25  *              struct sockaddr saddr;
  26  *              socklen_t slen = sizeof(saddr);
  27  *
  28  *              if (argc == 2) {
  29  *                      dest = argv[1];
  30  *                      port = "http";
  31  *              } else if (argc == 3) {
  32  *                      dest = argv[1];
  33  *                      port = argv[2];
  34  *              } else
  35  *                      errx(1, "Usage: test-net <target> [<port>]");
  36  *
  37  *              addr = net_client_lookup(dest, port, AF_UNSPEC, SOCK_STREAM);
  38  *              if (!addr)
  39  *                      err(1, "Failed to look up %s", dest);
  40  *
  41  *              fd = net_connect(addr);
  42  *              if (fd < 0)
  43  *                      err(1, "Failed to connect to %s", dest);
  44  *
  45  *              if (getsockname(fd, &saddr, &slen) == 0)
  46  *                      printf("Connected via %s\n",
  47  *                             saddr.sa_family == AF_INET6 ? "IPv6"
  48  *                             : saddr.sa_family == AF_INET ? "IPv4"
  49  *                             : "UNKNOWN??");
  50  *              else
  51  *                      err(1, "Failed to get socket type for connection");
  52  *              return 0;
  53  *      }
  54  */
  55 int main(int argc, char *argv[])
  56 {
  57         /* Expect exactly one argument */
  58         if (argc != 2)
  59                 return 1;
  60
  61         if (strcmp(argv[1], "depends") == 0) {
  62                 printf("ccan/noerr\n");
  63                 return 0;
  64         }
  65
  66         return 1;
  67 }