lib/roken/getifaddrs_w32.c

   1 /***********************************************************************
   2  * Copyright (c) 2009, Secure Endpoints Inc.
   3  * All rights reserved.
   4  *
   5  * Redistribution and use in source and binary forms, with or without
   6  * modification, are permitted provided that the following conditions
   7  * are met:
   8  *
   9  * - Redistributions of source code must retain the above copyright
  10  *   notice, this list of conditions and the following disclaimer.
  11  *
  12  * - Redistributions in binary form must reproduce the above copyright
  13  *   notice, this list of conditions and the following disclaimer in
  14  *   the documentation and/or other materials provided with the
  15  *   distribution.
  16  *
  17  * THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS
  18  * "AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT
  19  * LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS
  20  * FOR A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE
  21  * COPYRIGHT HOLDER OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT,
  22  * INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES
  23  * (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR
  24  * SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
  25  * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT,
  26  * STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE)
  27  * ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED
  28  * OF THE POSSIBILITY OF SUCH DAMAGE.
  29  *
  30  **********************************************************************/
  31
  32 #include<config.h>
  33
  34 #include <roken.h>
  35
  36 #include <ifaddrs.h>
  37
  38 #ifndef _WIN32
  39 #error This is a Windows specific implementation.
  40 #endif
  41
  42 static struct sockaddr *
  43 dupaddr(const sockaddr_gen * src)
  44 {
  45     sockaddr_gen * d = malloc(sizeof(*d));
  46
  47     if (d) {
  48         memcpy(d, src, sizeof(*d));
  49     }
  50
  51     return (struct sockaddr *) d;
  52 }
  53
  54 int ROKEN_LIB_FUNCTION
  55 rk_getifaddrs(struct ifaddrs **ifpp)
  56 {
  57     SOCKET s = INVALID_SOCKET;
  58     size_t il_len = 8192;
  59     int ret = -1;
  60     INTERFACE_INFO *il = NULL;
  61
  62     *ifpp = NULL;
  63
  64     s = socket(AF_INET, SOCK_DGRAM, 0);
  65     if (s == INVALID_SOCKET)
  66         return -1;
  67
  68     for (;;) {
  69         DWORD cbret = 0;
  70
  71         il = malloc(il_len);
  72         if (!il)
  73             break;
  74
  75         ZeroMemory(il, il_len);
  76
  77         if (WSAIoctl(s, SIO_GET_INTERFACE_LIST, NULL, 0,
  78                      (LPVOID) il, (DWORD) il_len, &cbret,
  79                      NULL, NULL) == 0) {
  80             il_len = cbret;
  81             break;
  82         }
  83
  84         free (il);
  85         il = NULL;
  86
  87         if (WSAGetLastError() == WSAEFAULT && cbret > il_len) {
  88             il_len = cbret;
  89         } else {
  90             break;
  91         }
  92     }
  93
  94     if (!il)
  95         goto _exit;
  96
  97     /* il is an array of INTERFACE_INFO structures.  il_len has the
  98        actual size of the buffer.  The number of elements is
  99        il_len/sizeof(INTERFACE_INFO) */
 100
 101     {
 102         size_t n = il_len / sizeof(INTERFACE_INFO);
 103         size_t i;
 104
 105         for (i = 0; i < n; i++ ) {
 106             struct ifaddrs *ifp;
 107
 108             ifp = malloc(sizeof(*ifp));
 109             if (ifp == NULL)
 110                 break;
 111
 112             ZeroMemory(ifp, sizeof(*ifp));
 113
 114             ifp->ifa_next = NULL;
 115             ifp->ifa_name = NULL;
 116             ifp->ifa_flags = il[i].iiFlags;
 117             ifp->ifa_addr = dupaddr(&il[i].iiAddress);
 118             ifp->ifa_netmask = dupaddr(&il[i].iiNetmask);
 119             ifp->ifa_broadaddr = dupaddr(&il[i].iiBroadcastAddress);
 120             ifp->ifa_data = NULL;
 121
 122             *ifpp = ifp;
 123             ifpp = &ifp->ifa_next;
 124         }
 125
 126         if (i == n)
 127             ret = 0;
 128     }
 129
 130  _exit:
 131
 132     if (s != INVALID_SOCKET)
 133         closesocket(s);
 134
 135     if (il)
 136         free (il);
 137
 138     return ret;
 139 }
 140
 141 void ROKEN_LIB_FUNCTION
 142 rk_freeifaddrs(struct ifaddrs *ifp)
 143 {
 144     struct ifaddrs *p, *q;
 145
 146     for(p = ifp; p; ) {
 147         if (p->ifa_name)
 148             free(p->ifa_name);
 149         if(p->ifa_addr)
 150             free(p->ifa_addr);
 151         if(p->ifa_dstaddr)
 152             free(p->ifa_dstaddr);
 153         if(p->ifa_netmask)
 154             free(p->ifa_netmask);
 155         if(p->ifa_data)
 156             free(p->ifa_data);
 157         q = p;
 158         p = p->ifa_next;
 159         free(q);
 160     }
 161 }