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