static u_int
pcap_sendqueue_transmit_win32(pcap_t *p, pcap_send_queue *queue, int sync)
{
struct pcap_win *pw = p->priv;
u_int res;
char errbuf[PCAP_ERRBUF_SIZE+1];
if (pw->adapter==NULL) {
pcap_snprintf(p->errbuf, PCAP_ERRBUF_SIZE,
"Cannot transmit a queue to an offline capture or to a TurboCap port");
return (0);
}
res = PacketSendPackets(pw->adapter,
queue->buffer,
queue->len,
(BOOLEAN)sync);
if(res != queue->len){
pcap_win32_err_to_str(GetLastError(), errbuf);
pcap_snprintf(p->errbuf, PCAP_ERRBUF_SIZE,
"Error opening adapter: %s", errbuf);
}
return (res);
}
/*
* Win32-only routine for getting statistics.
*
* This way is definitely safer than passing the pcap_stat * from the userland.
* In fact, there could happen than the user allocates a variable which is not
* big enough for the new structure, and the library will write in a zone
* which is not allocated to this variable.
*
* In this way, we're pretty sure we are writing on memory allocated to this
* variable.
*
* XXX - but this is the wrong way to handle statistics. Instead, we should
* have an API that returns data in a form like the Options section of a
* pcapng Interface Statistics Block:
*
* http://xml2rfc.tools.ietf.org/cgi-bin/xml2rfc.cgi?url=https://raw.githubusercontent.com/pcapng/pcapng/master/draft-tuexen-opsawg-pcapng.xml&modeAsFormat=html/ascii&type=ascii#rfc.section.4.6
*
* which would let us add new statistics straightforwardly and indicate which
* statistics we are and are *not* providing, rather than having to provide
* possibly-bogus values for statistics we can't provide.
*/
struct pcap_stat *
pcap_stats_ex_win32(pcap_t *p, int *pcap_stat_size)
{
struct pcap_win *pw = p->priv;
struct bpf_stat bstats;
char errbuf[PCAP_ERRBUF_SIZE+1];
*pcap_stat_size = sizeof (p->stat);
/*
* Try to get statistics.
*
* (Please note - "struct pcap_stat" is *not* the same as
* WinPcap's "struct bpf_stat". It might currently have the
* same layout, but let's not cheat.)
*/
if (!PacketGetStatsEx(pw->adapter, &bstats)) {
pcap_win32_err_to_str(GetLastError(), errbuf);
pcap_snprintf(p->errbuf, PCAP_ERRBUF_SIZE,
"PacketGetStatsEx error: %s", errbuf);
return (NULL);
}
p->stat.ps_recv = bstats.bs_recv;
p->stat.ps_drop = bstats.bs_drop;
p->stat.ps_ifdrop = bstats.ps_ifdrop;
#ifdef ENABLE_REMOTE
p->stat.ps_capt = bstats.bs_capt;
#endif
return (&p->stat);
}
static int
pcap_oid_get_request_win32(pcap_t *p, bpf_u_int32 oid, void *data, size_t *lenp)
{
struct pcap_win *pw = p->priv;
PACKET_OID_DATA *oid_data_arg;
char errbuf[PCAP_ERRBUF_SIZE+1];
/*
* Allocate a PACKET_OID_DATA structure to hand to PacketRequest().
* It should be big enough to hold "*lenp" bytes of data; it
* will actually be slightly larger, as PACKET_OID_DATA has a
* 1-byte data array at the end, standing in for the variable-length
* data that's actually there.
*/
oid_data_arg = malloc(sizeof (PACKET_OID_DATA) + *lenp);
if (oid_data_arg == NULL) {
pcap_snprintf(p->errbuf, PCAP_ERRBUF_SIZE,
"Couldn't allocate argument buffer for PacketRequest");
return (PCAP_ERROR);
}
/*
* No need to copy the data - we're doing a fetch.
*/
oid_data_arg->Oid = oid;
oid_data_arg->Length = (ULONG)(*lenp); /* XXX - check for ridiculously large value? */
if (!PacketRequest(pw->adapter, FALSE, oid_data_arg)) {
pcap_win32_err_to_str(GetLastError(), errbuf);
pcap_snprintf(p->errbuf, PCAP_ERRBUF_SIZE,
"Error calling PacketRequest: %s", errbuf);
free(oid_data_arg);
return (PCAP_ERROR);
}
/*
* Get the length actually supplied.
*/
*lenp = oid_data_arg->Length;
/*
* Copy back the data we fetched.
*/
memcpy(data, oid_data_arg->Data, *lenp);
free(oid_data_arg);
return (0);
}
static int
pcap_stats_win32(pcap_t *p, struct pcap_stat *ps)
{
struct pcap_win *pw = p->priv;
struct bpf_stat bstats;
char errbuf[PCAP_ERRBUF_SIZE+1];
/*
* Try to get statistics.
*
* (Please note - "struct pcap_stat" is *not* the same as
* WinPcap's "struct bpf_stat". It might currently have the
* same layout, but let's not cheat.
*
* Note also that we don't fill in ps_capt, as we might have
* been called by code compiled against an earlier version of
* WinPcap that didn't have ps_capt, in which case filling it
* in would stomp on whatever comes after the structure passed
* to us.
*/
if (!PacketGetStats(pw->adapter, &bstats)) {
pcap_win32_err_to_str(GetLastError(), errbuf);
pcap_snprintf(p->errbuf, PCAP_ERRBUF_SIZE,
"PacketGetStats error: %s", errbuf);
return (-1);
}
ps->ps_recv = bstats.bs_recv;
ps->ps_drop = bstats.bs_drop;
/*
* XXX - PacketGetStats() doesn't fill this in, so we just
* return 0.
*/
#if 0
ps->ps_ifdrop = bstats.ps_ifdrop;
#else
ps->ps_ifdrop = 0;
#endif
return (0);
}
/*
* 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;
char our_errbuf[PCAP_ERRBUF_SIZE+1];
/*
* 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)
{
pcap_win32_err_to_str(last_error, our_errbuf);
pcap_snprintf(errbuf, PCAP_ERRBUF_SIZE,
"PacketGetAdapterNames: %s", our_errbuf);
return (-1);
}
}
if (NameLength > 0)
AdaptersName = (char*) malloc(NameLength);
else
{
*alldevsp = NULL;
return 0;
}
if (AdaptersName == NULL)
{
pcap_snprintf(errbuf, PCAP_ERRBUF_SIZE, "Cannot allocate enough memory to list the adapters.");
return (-1);
}
if (!PacketGetAdapterNames(AdaptersName, &NameLength)) {
pcap_win32_err_to_str(GetLastError(), our_errbuf);
pcap_snprintf(errbuf, PCAP_ERRBUF_SIZE, "PacketGetAdapterNames: %s",
our_errbuf);
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);
}
