wsutil/interface.c

   1 /* interface.c
   2  * Utility functions to get infos from interfaces
   3  *
   4  * Copyright 2016, Dario Lombardo
   5  *
   6  * Wireshark - Network traffic analyzer
   7  * By Gerald Combs <gerald@wireshark.org>
   8  * Copyright 1998 Gerald Combs
   9  *
  10  * This program is free software; you can redistribute it and/or
  11  * modify it under the terms of the GNU General Public License
  12  * as published by the Free Software Foundation; either version 2
  13  * of the License, or (at your option) any later version.
  14  *
  15  * This program is distributed in the hope that it will be useful,
  16  * but WITHOUT ANY WARRANTY; without even the implied warranty of
  17  * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
  18  * GNU General Public License for more details.
  19  *
  20  * You should have received a copy of the GNU General Public License
  21  * along with this program; if not, write to the Free Software
  22  * Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA.
  23  */
  24
  25 #include "config.h"
  26
  27 #include "interface.h"
  28
  29 #include <string.h>
  30 #include <wsutil/inet_addr.h>
  31
  32 #ifdef HAVE_SYS_TYPES_H
  33         #include <sys/types.h>
  34 #endif
  35
  36 #ifdef HAVE_SYS_SOCKET_H
  37         #include <sys/socket.h>
  38 #endif
  39
  40 #ifdef HAVE_NETINET_IN_H
  41         #include <netinet/in.h>
  42 #endif
  43
  44 #ifdef HAVE_ARPA_INET_H
  45         #include <arpa/inet.h>
  46 #endif
  47
  48 #ifdef HAVE_IFADDRS_H
  49         #include <ifaddrs.h>
  50 #endif
  51
  52 #ifdef _WIN32
  53         #include <winsock2.h>
  54         #include <iphlpapi.h>
  55         #include <Ws2tcpip.h>
  56 #endif
  57
  58 #define WORKING_BUFFER_SIZE 15000
  59
  60 #ifdef HAVE_GETIFADDRS
  61 static GSList* local_interfaces_to_list_nix(void)
  62 {
  63         GSList *interfaces = NULL;
  64         struct ifaddrs *ifap;
  65         struct ifaddrs *ifa;
  66         int family;
  67         char ip[INET6_ADDRSTRLEN];
  68
  69         if (getifaddrs(&ifap)) {
  70                 goto end;
  71         }
  72
  73         for (ifa = ifap; ifa != NULL; ifa = ifa->ifa_next) {
  74                 if (ifa->ifa_addr == NULL)
  75                         continue;
  76
  77                 family = ifa->ifa_addr->sa_family;
  78
  79                 memset(ip, 0x0, INET6_ADDRSTRLEN);
  80
  81                 switch (family) {
  82                         case AF_INET:
  83                         {
  84                                 struct sockaddr_in *addr4 = (struct sockaddr_in *)ifa->ifa_addr;
  85                                 ws_inet_ntop4(&addr4->sin_addr, ip, sizeof(ip));
  86                                 break;
  87                         }
  88
  89                         case AF_INET6:
  90                         {
  91                                 struct sockaddr_in6 *addr6 = (struct sockaddr_in6 *)ifa->ifa_addr;
  92                                 ws_inet_ntop6(&addr6->sin6_addr, ip, sizeof(ip));
  93                                 break;
  94                         }
  95
  96                         default:
  97                                 break;
  98                 }
  99
 100                 /* skip loopback addresses */
 101                 if (!g_strcmp0(ip, "127.0.0.1") || !g_strcmp0(ip, "::1"))
 102                         continue;
 103
 104                 if (*ip) {
 105                         interfaces = g_slist_prepend(interfaces, g_strdup(ip));
 106                 }
 107         }
 108         freeifaddrs(ifap);
 109 end:
 110         return interfaces;
 111 }
 112 #endif /* HAVE_GETIFADDRS */
 113
 114 #ifdef _WIN32
 115 static GSList* local_interfaces_to_list_win(void)
 116 {
 117         GSList *interfaces = NULL;
 118         PIP_ADAPTER_ADDRESSES pAddresses = NULL;
 119         ULONG outBufLen = WORKING_BUFFER_SIZE;
 120         ULONG family = AF_UNSPEC;
 121         PIP_ADAPTER_ADDRESSES pCurrAddresses = NULL;
 122         PIP_ADAPTER_UNICAST_ADDRESS pUnicast = NULL;
 123         char ip[100];
 124         guint iplen = 100;
 125
 126         pAddresses = (IP_ADAPTER_ADDRESSES *)g_malloc0(outBufLen);
 127         if (pAddresses == NULL)
 128                 return NULL;
 129
 130         if (GetAdaptersAddresses(family, 0, NULL, pAddresses, &outBufLen) != NO_ERROR)
 131                 goto end;
 132
 133         pCurrAddresses = pAddresses;
 134         while (pCurrAddresses) {
 135
 136                 for (pUnicast = pCurrAddresses->FirstUnicastAddress; pUnicast != NULL; pUnicast = pUnicast->Next) {
 137                         if (pUnicast->Address.lpSockaddr->sa_family == AF_INET) {
 138                                 SOCKADDR_IN* sa_in = (SOCKADDR_IN *)pUnicast->Address.lpSockaddr;
 139                                 ws_inet_ntop4(&(sa_in->sin_addr), ip, iplen);
 140                                 if (!g_strcmp0(ip, "127.0.0.1"))
 141                                         continue;
 142                                 if (*ip)
 143                                         interfaces = g_slist_prepend(interfaces, g_strdup(ip));
 144                         }
 145                         if (pUnicast->Address.lpSockaddr->sa_family == AF_INET6) {
 146                                 SOCKADDR_IN6* sa_in6 = (SOCKADDR_IN6 *)pUnicast->Address.lpSockaddr;
 147                                 ws_inet_ntop6(&(sa_in6->sin6_addr), ip, iplen);
 148                                 if (!g_strcmp0(ip, "::1"))
 149                                         continue;
 150                                 if (*ip)
 151                                         interfaces = g_slist_prepend(interfaces, g_strdup(ip));
 152                         }
 153                 }
 154                 pCurrAddresses = pCurrAddresses->Next;
 155         }
 156 end:
 157         if (pAddresses)
 158                 g_free(pAddresses);
 159
 160         return interfaces;
 161 }
 162 #endif /* _WIN32 */
 163
 164 GSList* local_interfaces_to_list(void)
 165 {
 166 #if defined(_WIN32)
 167         return local_interfaces_to_list_win();
 168 #elif defined(HAVE_GETIFADDRS)
 169         return local_interfaces_to_list_nix();
 170 #else
 171         return NULL;
 172 #endif
 173 }
 174
 175 /*
 176  * Editor modelines  -  https://www.wireshark.org/tools/modelines.html
 177  *
 178  * Local variables:
 179  * c-basic-offset: 4
 180  * tab-width: 8
 181  * indent-tabs-mode: t
 182  * End:
 183  *
 184  * vi: set shiftwidth=4 tabstop=8 noexpandtab:
 185  * :indentSize=4:tabSize=8:noTabs=false:
 186  */