src/bin/network/traceroute/findsaddr-haiku.c

   1 /*
   2  * Copyright 2007, Haiku Inc. All rights reserved.
   3  * Distributed under the terms of the MIT License.
   4  *
   5  * Authors:
   6  *              Hugo Santos <hugosantos@gmail.com>
   7  */
   8
   9
  10 #include <stdint.h>
  11 #include <string.h>
  12 #include <unistd.h>
  13 #include <net/route.h>
  14 #include <netinet/in.h>
  15 #include <sys/ioctl.h>
  16 #include <sys/socket.h>
  17 #include <sys/sockio.h>
  18
  19 #include "findsaddr.h"
  20         // is not self containing...
  21
  22
  23 const char *
  24 findsaddr(const struct sockaddr_in *to, struct sockaddr_in *from)
  25 {
  26         uint8_t buffer[256];
  27         struct route_entry *request = (struct route_entry *)buffer;
  28
  29         int sock = socket(AF_INET, SOCK_DGRAM, 0);
  30         if (sock < 0)
  31                 return "socket() failed";
  32
  33         memset(request, 0, sizeof(struct route_entry));
  34         request->destination = (struct sockaddr *)to;
  35
  36         if (ioctl(sock, SIOCGETRT, buffer, sizeof(buffer)) < 0) {
  37                 close(sock);
  38                 return "ioctl(SIOCGETRT) failed";
  39         }
  40
  41         if (request->source != NULL && request->source->sa_family == AF_INET)
  42                 memcpy(from, request->source, sizeof(struct sockaddr_in));
  43
  44         close(sock);
  45
  46         if (request->source == NULL || request->source->sa_family != AF_INET)
  47                 return "No address available";
  48
  49         return NULL;
  50 }