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249 lines
6.5 KiB
C
249 lines
6.5 KiB
C
/*
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* Copyright (c) 2002 - 2005 NetGroup, Politecnico di Torino (Italy)
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* Copyright (c) 2005 - 2006 CACE Technologies, Davis (California)
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* All rights reserved.
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*
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* Redistribution and use in source and binary forms, with or without
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* modification, are permitted provided that the following conditions
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* are met:
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*
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* 1. Redistributions of source code must retain the above copyright
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* notice, this list of conditions and the following disclaimer.
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* 2. Redistributions in binary form must reproduce the above copyright
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* notice, this list of conditions and the following disclaimer in the
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* documentation and/or other materials provided with the distribution.
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* 3. Neither the name of the Politecnico di Torino, CACE Technologies
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* nor the names of its contributors may be used to endorse or promote
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* products derived from this software without specific prior written
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* permission.
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*
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* THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS
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* "AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT
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* LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR
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* A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT
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* OWNER OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL,
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* SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT
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* LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE,
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* DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY
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* THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
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* (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE
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* OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
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*
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*/
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#ifdef HAVE_CONFIG_H
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#include "config.h"
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#endif
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#include <pcap.h>
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#include <pcap-int.h>
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#include <Packet32.h>
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#include <errno.h>
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static int
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pcap_add_if_win32(pcap_if_t **devlist, char *name, const char *desc,
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char *errbuf)
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{
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pcap_if_t *curdev;
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npf_if_addr if_addrs[MAX_NETWORK_ADDRESSES];
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LONG if_addr_size;
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int res = 0;
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if_addr_size = MAX_NETWORK_ADDRESSES;
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/*
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* Add an entry for this interface, with no addresses.
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*/
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if (add_or_find_if(&curdev, devlist, name, 0, desc, errbuf) == -1) {
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/*
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* Failure.
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*/
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return (-1);
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}
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/*
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* Get the list of addresses for the interface.
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*/
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if (!PacketGetNetInfoEx((void *)name, if_addrs, &if_addr_size)) {
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/*
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* Failure.
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*
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* We don't return an error, because this can happen with
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* NdisWan interfaces, and we want to supply them even
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* if we can't supply their addresses.
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*
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* We return an entry with an empty address list.
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*/
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return (0);
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}
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/*
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* Now add the addresses.
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*/
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while (if_addr_size-- > 0) {
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/*
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* "curdev" is an entry for this interface; add an entry for
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* this address to its list of addresses.
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*/
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if(curdev == NULL)
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break;
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res = add_addr_to_dev(curdev,
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(struct sockaddr *)&if_addrs[if_addr_size].IPAddress,
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sizeof (struct sockaddr_storage),
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(struct sockaddr *)&if_addrs[if_addr_size].SubnetMask,
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sizeof (struct sockaddr_storage),
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(struct sockaddr *)&if_addrs[if_addr_size].Broadcast,
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sizeof (struct sockaddr_storage),
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NULL,
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0,
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errbuf);
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if (res == -1) {
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/*
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* Failure.
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*/
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break;
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}
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}
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return (res);
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}
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/*
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* Get a list of all interfaces that are up and that we can open.
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* Returns -1 on error, 0 otherwise.
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* The list, as returned through "alldevsp", may be null if no interfaces
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* were up and could be opened.
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*
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* Win32 implementation, based on WinPcap
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*/
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int
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pcap_findalldevs_interfaces(pcap_if_t **alldevsp, char *errbuf)
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{
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pcap_if_t *devlist = NULL;
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int ret = 0;
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const char *desc;
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char *AdaptersName;
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ULONG NameLength;
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char *name;
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/*
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* Find out how big a buffer we need.
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*
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* This call should always return FALSE; if the error is
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* ERROR_INSUFFICIENT_BUFFER, NameLength will be set to
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* the size of the buffer we need, otherwise there's a
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* problem, and NameLength should be set to 0.
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*
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* It shouldn't require NameLength to be set, but,
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* at least as of WinPcap 4.1.3, it checks whether
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* NameLength is big enough before it checks for a
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* NULL buffer argument, so, while it'll still do
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* the right thing if NameLength is uninitialized and
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* whatever junk happens to be there is big enough
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* (because the pointer argument will be null), it's
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* still reading an uninitialized variable.
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*/
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NameLength = 0;
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if (!PacketGetAdapterNames(NULL, &NameLength))
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{
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DWORD last_error = GetLastError();
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if (last_error != ERROR_INSUFFICIENT_BUFFER)
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{
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snprintf(errbuf, PCAP_ERRBUF_SIZE,
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"PacketGetAdapterNames: %s",
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pcap_win32strerror());
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return (-1);
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}
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}
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if (NameLength > 0)
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AdaptersName = (char*) malloc(NameLength);
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else
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{
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*alldevsp = NULL;
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return 0;
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}
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if (AdaptersName == NULL)
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{
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snprintf(errbuf, PCAP_ERRBUF_SIZE, "Cannot allocate enough memory to list the adapters.");
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return (-1);
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}
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if (!PacketGetAdapterNames(AdaptersName, &NameLength)) {
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snprintf(errbuf, PCAP_ERRBUF_SIZE,
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"PacketGetAdapterNames: %s",
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pcap_win32strerror());
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free(AdaptersName);
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return (-1);
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}
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/*
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* "PacketGetAdapterNames()" returned a list of
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* null-terminated ASCII interface name strings,
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* terminated by a null string, followed by a list
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* of null-terminated ASCII interface description
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* strings, terminated by a null string.
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* This means there are two ASCII nulls at the end
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* of the first list.
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*
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* Find the end of the first list; that's the
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* beginning of the second list.
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*/
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desc = &AdaptersName[0];
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while (*desc != '\0' || *(desc + 1) != '\0')
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desc++;
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/*
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* Found it - "desc" points to the first of the two
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* nulls at the end of the list of names, so the
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* first byte of the list of descriptions is two bytes
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* after it.
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*/
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desc += 2;
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/*
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* Loop over the elements in the first list.
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*/
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name = &AdaptersName[0];
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while (*name != '\0') {
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/*
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* Add an entry for this interface.
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*/
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if (pcap_add_if_win32(&devlist, name, desc, errbuf) == -1) {
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/*
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* Failure.
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*/
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ret = -1;
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break;
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}
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name += strlen(name) + 1;
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desc += strlen(desc) + 1;
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}
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if (ret != -1) {
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/*
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* We haven't had any errors yet; do any platform-specific
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* operations to add devices.
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*/
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if (pcap_platform_finddevs(&devlist, errbuf) < 0)
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ret = -1;
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}
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if (ret == -1) {
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/*
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* We had an error; free the list we've been constructing.
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*/
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if (devlist != NULL) {
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pcap_freealldevs(devlist);
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devlist = NULL;
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}
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}
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*alldevsp = devlist;
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free(AdaptersName);
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return (ret);
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}
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