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 #ifdef HAVE_CONFIG_H
  33 #include<config.h>
  34 #endif
  35
  36 #include <roken.h>
  37
  38 #include <ifaddrs.h>
  39
  40 #ifndef _WIN32
  41 #error This is a Windows specific implementation.
  42 #endif
  43
  44 static struct sockaddr *
  45 dupaddr(const sockaddr_gen * src)
  46 {
  47     sockaddr_gen * d = malloc(sizeof(*d));
  48
  49     if (d) {
  50         memcpy(d, src, sizeof(*d));
  51     }
  52
  53     return (struct sockaddr *) d;
  54 }
  55
  56 int ROKEN_LIB_FUNCTION
  57 rk_getifaddrs(struct ifaddrs **ifpp)
  58 {
  59     SOCKET s = INVALID_SOCKET;
  60     size_t il_len = 8192;
  61     int ret = -1;
  62     INTERFACE_INFO *il = NULL;
  63
  64     *ifpp = NULL;
  65
  66     s = socket(AF_INET, SOCK_DGRAM, 0);
  67     if (s == INVALID_SOCKET)
  68         return -1;
  69
  70     for (;;) {
  71         DWORD cbret = 0;
  72
  73         il = malloc(il_len);
  74         if (!il)
  75             break;
  76
  77         ZeroMemory(il, il_len);
  78
  79         if (WSAIoctl(s, SIO_GET_INTERFACE_LIST, NULL, 0,
  80                      (LPVOID) il, (DWORD) il_len, &cbret,
  81                      NULL, NULL) == 0) {
  82             il_len = cbret;
  83             break;
  84         }
  85
  86         free (il);
  87         il = NULL;
  88
  89         if (WSAGetLastError() == WSAEFAULT && cbret > il_len) {
  90             il_len = cbret;
  91         } else {
  92             break;
  93         }
  94     }
  95
  96     if (!il)
  97         goto _exit;
  98
  99     /* il is an array of INTERFACE_INFO structures.  il_len has the
 100        actual size of the buffer.  The number of elements is
 101        il_len/sizeof(INTERFACE_INFO) */
 102
 103     {
 104         size_t n = il_len / sizeof(INTERFACE_INFO);
 105         size_t i;
 106
 107         for (i = 0; i < n; i++ ) {
 108             struct ifaddrs *ifp;
 109
 110             ifp = malloc(sizeof(*ifp));
 111             if (ifp == NULL)
 112                 break;
 113
 114             ZeroMemory(ifp, sizeof(*ifp));
 115
 116             ifp->ifa_next = NULL;
 117             ifp->ifa_name = NULL;
 118             ifp->ifa_flags = il[i].iiFlags;
 119             ifp->ifa_addr = dupaddr(&il[i].iiAddress);
 120             ifp->ifa_netmask = dupaddr(&il[i].iiNetmask);
 121             ifp->ifa_broadaddr = dupaddr(&il[i].iiBroadcastAddress);
 122             ifp->ifa_data = NULL;
 123
 124             *ifpp = ifp;
 125             ifpp = &ifp->ifa_next;
 126         }
 127
 128         if (i == n)
 129             ret = 0;
 130     }
 131
 132  _exit:
 133
 134     if (s != INVALID_SOCKET)
 135         closesocket(s);
 136
 137     if (il)
 138         free (il);
 139
 140     return ret;
 141 }
 142
 143 void ROKEN_LIB_FUNCTION
 144 rk_freeifaddrs(struct ifaddrs *ifp)
 145 {
 146     struct ifaddrs *p, *q;
 147
 148     for(p = ifp; p; ) {
 149         if (p->ifa_name)
 150             free(p->ifa_name);
 151         if(p->ifa_addr)
 152             free(p->ifa_addr);
 153         if(p->ifa_dstaddr)
 154             free(p->ifa_dstaddr);
 155         if(p->ifa_netmask)
 156             free(p->ifa_netmask);
 157         if(p->ifa_data)
 158             free(p->ifa_data);
 159         q = p;
 160         p = p->ifa_next;
 161         free(q);
 162     }
 163 }