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Diffstat (limited to 'pcap-npf.c')
| -rw-r--r-- | pcap-npf.c | 2114 |
1 files changed, 2114 insertions, 0 deletions
diff --git a/pcap-npf.c b/pcap-npf.c new file mode 100644 index 0000000..da4641f --- /dev/null +++ b/pcap-npf.c @@ -0,0 +1,2114 @@ +/* + * Copyright (c) 1999 - 2005 NetGroup, Politecnico di Torino (Italy) + * Copyright (c) 2005 - 2010 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 <errno.h> +#define PCAP_DONT_INCLUDE_PCAP_BPF_H +#include <Packet32.h> +#include <pcap-int.h> +#include <pcap/dlt.h> + +/* Old-school MinGW have these headers in a different place. + */ +#if defined(__MINGW32__) && !defined(__MINGW64_VERSION_MAJOR) + #include <ddk/ntddndis.h> + #include <ddk/ndis.h> +#else + #include <ntddndis.h> /* MSVC/TDM-MinGW/MinGW64 */ +#endif + +#ifdef HAVE_DAG_API + #include <dagnew.h> + #include <dagapi.h> +#endif /* HAVE_DAG_API */ + +static int pcap_setfilter_npf(pcap_t *, struct bpf_program *); +static int pcap_setfilter_win32_dag(pcap_t *, struct bpf_program *); +static int pcap_getnonblock_npf(pcap_t *); +static int pcap_setnonblock_npf(pcap_t *, int); + +/*dimension of the buffer in the pcap_t structure*/ +#define WIN32_DEFAULT_USER_BUFFER_SIZE 256000 + +/*dimension of the buffer in the kernel driver NPF */ +#define WIN32_DEFAULT_KERNEL_BUFFER_SIZE 1000000 + +/* Equivalent to ntohs(), but a lot faster under Windows */ +#define SWAPS(_X) ((_X & 0xff) << 8) | (_X >> 8) + +/* + * Private data for capturing on WinPcap/Npcap devices. + */ +struct pcap_win { + ADAPTER *adapter; /* the packet32 ADAPTER for the device */ + int nonblock; + int rfmon_selfstart; /* a flag tells whether the monitor mode is set by itself */ + int filtering_in_kernel; /* using kernel filter */ + +#ifdef HAVE_DAG_API + int dag_fcs_bits; /* Number of checksum bits from link layer */ +#endif + +#ifdef ENABLE_REMOTE + int samp_npkt; /* parameter needed for sampling, with '1 out of N' method has been requested */ + struct timeval samp_time; /* parameter needed for sampling, with '1 every N ms' method has been requested */ +#endif +}; + +/* + * Define stub versions of the monitor-mode support routines if this + * isn't Npcap. HAVE_NPCAP_PACKET_API is defined by Npcap but not + * WinPcap. + */ +#ifndef HAVE_NPCAP_PACKET_API +static int +PacketIsMonitorModeSupported(PCHAR AdapterName _U_) +{ + /* + * We don't support monitor mode. + */ + return (0); +} + +static int +PacketSetMonitorMode(PCHAR AdapterName _U_, int mode _U_) +{ + /* + * This should never be called, as PacketIsMonitorModeSupported() + * will return 0, meaning "we don't support monitor mode, so + * don't try to turn it on or off". + */ + return (0); +} + +static int +PacketGetMonitorMode(PCHAR AdapterName _U_) +{ + /* + * This should fail, so that pcap_activate_npf() returns + * PCAP_ERROR_RFMON_NOTSUP if our caller requested monitor + * mode. + */ + return (-1); +} +#endif + +/* + * Sigh. PacketRequest() will have made a DeviceIoControl() + * call to the NPF driver to perform the OID request, with a + * BIOCQUERYOID ioctl. The kernel code should get back one + * of NDIS_STATUS_INVALID_OID, NDIS_STATUS_NOT_SUPPORTED, + * or NDIS_STATUS_NOT_RECOGNIZED if the OID request isn't + * supported by the OS or the driver, but that doesn't seem + * to make it to the caller of PacketRequest() in a + * reliable fashion. + */ +#define NDIS_STATUS_INVALID_OID 0xc0010017 +#define NDIS_STATUS_NOT_SUPPORTED 0xc00000bb /* STATUS_NOT_SUPPORTED */ +#define NDIS_STATUS_NOT_RECOGNIZED 0x00010001 + +static int +oid_get_request(ADAPTER *adapter, bpf_u_int32 oid, void *data, size_t *lenp, + char *errbuf) +{ + PACKET_OID_DATA *oid_data_arg; + + /* + * 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(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(adapter, FALSE, oid_data_arg)) { + pcap_fmt_errmsg_for_win32_err(errbuf, PCAP_ERRBUF_SIZE, + GetLastError(), "Error calling PacketRequest"); + free(oid_data_arg); + return (-1); + } + + /* + * 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_npf(pcap_t *p, struct pcap_stat *ps) +{ + struct pcap_win *pw = p->priv; + struct bpf_stat bstats; + + /* + * 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_fmt_errmsg_for_win32_err(p->errbuf, PCAP_ERRBUF_SIZE, + GetLastError(), "PacketGetStats error"); + 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); +} + +/* + * 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_npf(pcap_t *p, int *pcap_stat_size) +{ + struct pcap_win *pw = p->priv; + struct bpf_stat bstats; + + *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_fmt_errmsg_for_win32_err(p->errbuf, PCAP_ERRBUF_SIZE, + GetLastError(), "PacketGetStatsEx error"); + 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); +} + +/* Set the dimension of the kernel-level capture buffer */ +static int +pcap_setbuff_npf(pcap_t *p, int dim) +{ + struct pcap_win *pw = p->priv; + + if(PacketSetBuff(pw->adapter,dim)==FALSE) + { + pcap_snprintf(p->errbuf, PCAP_ERRBUF_SIZE, "driver error: not enough memory to allocate the kernel buffer"); + return (-1); + } + return (0); +} + +/* Set the driver working mode */ +static int +pcap_setmode_npf(pcap_t *p, int mode) +{ + struct pcap_win *pw = p->priv; + + if(PacketSetMode(pw->adapter,mode)==FALSE) + { + pcap_snprintf(p->errbuf, PCAP_ERRBUF_SIZE, "driver error: working mode not recognized"); + return (-1); + } + + return (0); +} + +/*set the minimum amount of data that will release a read call*/ +static int +pcap_setmintocopy_npf(pcap_t *p, int size) +{ + struct pcap_win *pw = p->priv; + + if(PacketSetMinToCopy(pw->adapter, size)==FALSE) + { + pcap_snprintf(p->errbuf, PCAP_ERRBUF_SIZE, "driver error: unable to set the requested mintocopy size"); + return (-1); + } + return (0); +} + +static HANDLE +pcap_getevent_npf(pcap_t *p) +{ + struct pcap_win *pw = p->priv; + + return (PacketGetReadEvent(pw->adapter)); +} + +static int +pcap_oid_get_request_npf(pcap_t *p, bpf_u_int32 oid, void *data, size_t *lenp) +{ + struct pcap_win *pw = p->priv; + + return (oid_get_request(pw->adapter, oid, data, lenp, p->errbuf)); +} + +static int +pcap_oid_set_request_npf(pcap_t *p, bpf_u_int32 oid, const void *data, + size_t *lenp) +{ + struct pcap_win *pw = p->priv; + PACKET_OID_DATA *oid_data_arg; + + /* + * 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); + } + + oid_data_arg->Oid = oid; + oid_data_arg->Length = (ULONG)(*lenp); /* XXX - check for ridiculously large value? */ + memcpy(oid_data_arg->Data, data, *lenp); + if (!PacketRequest(pw->adapter, TRUE, oid_data_arg)) { + pcap_fmt_errmsg_for_win32_err(p->errbuf, PCAP_ERRBUF_SIZE, + GetLastError(), "Error calling PacketRequest"); + free(oid_data_arg); + return (PCAP_ERROR); + } + + /* + * Get the length actually copied. + */ + *lenp = oid_data_arg->Length; + + /* + * No need to copy the data - we're doing a set. + */ + free(oid_data_arg); + return (0); +} + +static u_int +pcap_sendqueue_transmit_npf(pcap_t *p, pcap_send_queue *queue, int sync) +{ + struct pcap_win *pw = p->priv; + u_int res; + + 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_fmt_errmsg_for_win32_err(p->errbuf, PCAP_ERRBUF_SIZE, + GetLastError(), "Error opening adapter"); + } + + return (res); +} + +static int +pcap_setuserbuffer_npf(pcap_t *p, int size) +{ + unsigned char *new_buff; + + if (size<=0) { + /* Bogus parameter */ + pcap_snprintf(p->errbuf, PCAP_ERRBUF_SIZE, + "Error: invalid size %d",size); + return (-1); + } + + /* Allocate the buffer */ + new_buff=(unsigned char*)malloc(sizeof(char)*size); + + if (!new_buff) { + pcap_snprintf(p->errbuf, PCAP_ERRBUF_SIZE, + "Error: not enough memory"); + return (-1); + } + + free(p->buffer); + + p->buffer=new_buff; + p->bufsize=size; + + return (0); +} + +static int +pcap_live_dump_npf(pcap_t *p, char *filename, int maxsize, int maxpacks) +{ + struct pcap_win *pw = p->priv; + BOOLEAN res; + + /* Set the packet driver in dump mode */ + res = PacketSetMode(pw->adapter, PACKET_MODE_DUMP); + if(res == FALSE){ + pcap_snprintf(p->errbuf, PCAP_ERRBUF_SIZE, + "Error setting dump mode"); + return (-1); + } + + /* Set the name of the dump file */ + res = PacketSetDumpName(pw->adapter, filename, (int)strlen(filename)); + if(res == FALSE){ + pcap_snprintf(p->errbuf, PCAP_ERRBUF_SIZE, + "Error setting kernel dump file name"); + return (-1); + } + + /* Set the limits of the dump file */ + res = PacketSetDumpLimits(pw->adapter, maxsize, maxpacks); + if(res == FALSE) { + pcap_snprintf(p->errbuf, PCAP_ERRBUF_SIZE, + "Error setting dump limit"); + return (-1); + } + + return (0); +} + +static int +pcap_live_dump_ended_npf(pcap_t *p, int sync) +{ + struct pcap_win *pw = p->priv; + + return (PacketIsDumpEnded(pw->adapter, (BOOLEAN)sync)); +} + +static PAirpcapHandle +pcap_get_airpcap_handle_npf(pcap_t *p) +{ +#ifdef HAVE_AIRPCAP_API + struct pcap_win *pw = p->priv; + + return (PacketGetAirPcapHandle(pw->adapter)); +#else + return (NULL); +#endif /* HAVE_AIRPCAP_API */ +} + +static int +pcap_read_npf(pcap_t *p, int cnt, pcap_handler callback, u_char *user) +{ + PACKET Packet; + int cc; + int n = 0; + register u_char *bp, *ep; + u_char *datap; + struct pcap_win *pw = p->priv; + + cc = p->cc; + if (p->cc == 0) { + /* + * Has "pcap_breakloop()" been called? + */ + if (p->break_loop) { + /* + * Yes - clear the flag that indicates that it + * has, and return PCAP_ERROR_BREAK to indicate + * that we were told to break out of the loop. + */ + p->break_loop = 0; + return (PCAP_ERROR_BREAK); + } + + /* + * Capture the packets. + * + * The PACKET structure had a bunch of extra stuff for + * Windows 9x/Me, but the only interesting data in it + * in the versions of Windows that we support is just + * a copy of p->buffer, a copy of p->buflen, and the + * actual number of bytes read returned from + * PacketReceivePacket(), none of which has to be + * retained from call to call, so we just keep one on + * the stack. + */ + PacketInitPacket(&Packet, (BYTE *)p->buffer, p->bufsize); + if (!PacketReceivePacket(pw->adapter, &Packet, TRUE)) { + /* + * Did the device go away? + * If so, the error we get is ERROR_GEN_FAILURE. + */ + DWORD errcode = GetLastError(); + + if (errcode == ERROR_GEN_FAILURE) { + /* + * The device on which we're capturing + * went away, or it became unusable + * by NPF due to a suspend/resume. + * + * XXX - hopefully no other error + * conditions are indicated by this. + * + * XXX - we really should return an + * appropriate error for that, but + * pcap_dispatch() etc. aren't + * documented as having error returns + * other than PCAP_ERROR or PCAP_ERROR_BREAK. + */ + pcap_snprintf(p->errbuf, PCAP_ERRBUF_SIZE, + "The interface disappeared"); + } else { + pcap_fmt_errmsg_for_win32_err(p->errbuf, + PCAP_ERRBUF_SIZE, errcode, + "PacketReceivePacket error"); + } + return (PCAP_ERROR); + } + + cc = Packet.ulBytesReceived; + + bp = p->buffer; + } + else + bp = p->bp; + + /* + * Loop through each packet. + */ +#define bhp ((struct bpf_hdr *)bp) + ep = bp + cc; + for (;;) { + register int caplen, hdrlen; + + /* + * Has "pcap_breakloop()" been called? + * If so, return immediately - if we haven't read any + * packets, clear the flag and return PCAP_ERROR_BREAK + * to indicate that we were told to break out of the loop, + * otherwise leave the flag set, so that the *next* call + * will break out of the loop without having read any + * packets, and return the number of packets we've + * processed so far. + */ + if (p->break_loop) { + if (n == 0) { + p->break_loop = 0; + return (PCAP_ERROR_BREAK); + } else { + p->bp = bp; + p->cc = (int) (ep - bp); + return (n); + } + } + if (bp >= ep) + break; + + caplen = bhp->bh_caplen; + hdrlen = bhp->bh_hdrlen; + datap = bp + hdrlen; + + /* + * Short-circuit evaluation: if using BPF filter + * in kernel, no need to do it now - we already know + * the packet passed the filter. + * + * XXX - bpf_filter() should always return TRUE if + * handed a null pointer for the program, but it might + * just try to "run" the filter, so we check here. + */ + if (pw->filtering_in_kernel || + p->fcode.bf_insns == NULL || + bpf_filter(p->fcode.bf_insns, datap, bhp->bh_datalen, caplen)) { +#ifdef ENABLE_REMOTE + switch (p->rmt_samp.method) { + + case PCAP_SAMP_1_EVERY_N: + pw->samp_npkt = (pw->samp_npkt + 1) % p->rmt_samp.value; + + /* Discard all packets that are not '1 out of N' */ + if (pw->samp_npkt != 0) { + bp += Packet_WORDALIGN(caplen + hdrlen); + continue; + } + break; + + case PCAP_SAMP_FIRST_AFTER_N_MS: + { + struct pcap_pkthdr *pkt_header = (struct pcap_pkthdr*) bp; + + /* + * Check if the timestamp of the arrived + * packet is smaller than our target time. + */ + if (pkt_header->ts.tv_sec < pw->samp_time.tv_sec || + (pkt_header->ts.tv_sec == pw->samp_time.tv_sec && pkt_header->ts.tv_usec < pw->samp_time.tv_usec)) { + bp += Packet_WORDALIGN(caplen + hdrlen); + continue; + } + + /* + * The arrived packet is suitable for being + * delivered to our caller, so let's update + * the target time. + */ + pw->samp_time.tv_usec = pkt_header->ts.tv_usec + p->rmt_samp.value * 1000; + if (pw->samp_time.tv_usec > 1000000) { + pw->samp_time.tv_sec = pkt_header->ts.tv_sec + pw->samp_time.tv_usec / 1000000; + pw->samp_time.tv_usec = pw->samp_time.tv_usec % 1000000; + } + } + } +#endif /* ENABLE_REMOTE */ + + /* + * XXX A bpf_hdr matches a pcap_pkthdr. + */ + (*callback)(user, (struct pcap_pkthdr*)bp, datap); + bp += Packet_WORDALIGN(caplen + hdrlen); + if (++n >= cnt && !PACKET_COUNT_IS_UNLIMITED(cnt)) { + p->bp = bp; + p->cc = (int) (ep - bp); + return (n); + } + } else { + /* + * Skip this packet. + */ + bp += Packet_WORDALIGN(caplen + hdrlen); + } + } +#undef bhp + p->cc = 0; + return (n); +} + +#ifdef HAVE_DAG_API +static int +pcap_read_win32_dag(pcap_t *p, int cnt, pcap_handler callback, u_char *user) +{ + struct pcap_win *pw = p->priv; + PACKET Packet; + u_char *dp = NULL; + int packet_len = 0, caplen = 0; + struct pcap_pkthdr pcap_header; + u_char *endofbuf; + int n = 0; + dag_record_t *header; + unsigned erf_record_len; + ULONGLONG ts; + int cc; + unsigned swt; + unsigned dfp = pw->adapter->DagFastProcess; + + cc = p->cc; + if (cc == 0) /* Get new packets only if we have processed all the ones of the previous read */ + { + /* + * Get new packets from the network. + * + * The PACKET structure had a bunch of extra stuff for + * Windows 9x/Me, but the only interesting data in it + * in the versions of Windows that we support is just + * a copy of p->buffer, a copy of p->buflen, and the + * actual number of bytes read returned from + * PacketReceivePacket(), none of which has to be + * retained from call to call, so we just keep one on + * the stack. + */ + PacketInitPacket(&Packet, (BYTE *)p->buffer, p->bufsize); + if (!PacketReceivePacket(pw->adapter, &Packet, TRUE)) { + pcap_snprintf(p->errbuf, PCAP_ERRBUF_SIZE, "read error: PacketReceivePacket failed"); + return (-1); + } + + cc = Packet.ulBytesReceived; + if(cc == 0) + /* The timeout has expired but we no packets arrived */ + return (0); + header = (dag_record_t*)pw->adapter->DagBuffer; + } + else + header = (dag_record_t*)p->bp; + + endofbuf = (char*)header + cc; + + /* + * Cycle through the packets + */ + do + { + erf_record_len = SWAPS(header->rlen); + if((char*)header + erf_record_len > endofbuf) + break; + + /* Increase the number of captured packets */ + p->stat.ps_recv++; + + /* Find the beginning of the packet */ + dp = ((u_char *)header) + dag_record_size; + + /* Determine actual packet len */ + switch(header->type) + { + case TYPE_ATM: + packet_len = ATM_SNAPLEN; + caplen = ATM_SNAPLEN; + dp += 4; + + break; + + case TYPE_ETH: + swt = SWAPS(header->wlen); + packet_len = swt - (pw->dag_fcs_bits); + caplen = erf_record_len - dag_record_size - 2; + if (caplen > packet_len) + { + caplen = packet_len; + } + dp += 2; + + break; + + case TYPE_HDLC_POS: + swt = SWAPS(header->wlen); + packet_len = swt - (pw->dag_fcs_bits); + caplen = erf_record_len - dag_record_size; + if (caplen > packet_len) + { + caplen = packet_len; + } + + break; + } + + if(caplen > p->snapshot) + caplen = p->snapshot; + + /* + * Has "pcap_breakloop()" been called? + * If so, return immediately - if we haven't read any + * packets, clear the flag and return -2 to indicate + * that we were told to break out of the loop, otherwise + * leave the flag set, so that the *next* call will break + * out of the loop without having read any packets, and + * return the number of packets we've processed so far. + */ + if (p->break_loop) + { + if (n == 0) + { + p->break_loop = 0; + return (-2); + } + else + { + p->bp = (char*)header; + p->cc = endofbuf - (char*)header; + return (n); + } + } + + if(!dfp) + { + /* convert between timestamp formats */ + ts = header->ts; + pcap_header.ts.tv_sec = (int)(ts >> 32); + ts = (ts & 0xffffffffi64) * 1000000; + ts += 0x80000000; /* rounding */ + pcap_header.ts.tv_usec = (int)(ts >> 32); + if (pcap_header.ts.tv_usec >= 1000000) { + pcap_header.ts.tv_usec -= 1000000; + pcap_header.ts.tv_sec++; + } + } + + /* No underlaying filtering system. We need to filter on our own */ + if (p->fcode.bf_insns) + { + if (bpf_filter(p->fcode.bf_insns, dp, packet_len, caplen) == 0) + { + /* Move to next packet */ + header = (dag_record_t*)((char*)header + erf_record_len); + continue; + } + } + + /* Fill the header for the user suppplied callback function */ + pcap_header.caplen = caplen; + pcap_header.len = packet_len; + + /* Call the callback function */ + (*callback)(user, &pcap_header, dp); + + /* Move to next packet */ + header = (dag_record_t*)((char*)header + erf_record_len); + + /* Stop if the number of packets requested by user has been reached*/ + if (++n >= cnt && !PACKET_COUNT_IS_UNLIMITED(cnt)) + { + p->bp = (char*)header; + p->cc = endofbuf - (char*)header; + return (n); + } + } + while((u_char*)header < endofbuf); + + return (1); +} +#endif /* HAVE_DAG_API */ + +/* Send a packet to the network */ +static int +pcap_inject_npf(pcap_t *p, const void *buf, size_t size) +{ + struct pcap_win *pw = p->priv; + PACKET pkt; + + PacketInitPacket(&pkt, (PVOID)buf, size); + if(PacketSendPacket(pw->adapter,&pkt,TRUE) == FALSE) { + pcap_snprintf(p->errbuf, PCAP_ERRBUF_SIZE, "send error: PacketSendPacket failed"); + return (-1); + } + + /* + * We assume it all got sent if "PacketSendPacket()" succeeded. + * "pcap_inject()" is expected to return the number of bytes + * sent. + */ + return ((int)size); +} + +static void +pcap_cleanup_npf(pcap_t *p) +{ + struct pcap_win *pw = p->priv; + + if (pw->adapter != NULL) { + PacketCloseAdapter(pw->adapter); + pw->adapter = NULL; + } + if (pw->rfmon_selfstart) + { + PacketSetMonitorMode(p->opt.device, 0); + } + pcap_cleanup_live_common(p); +} + +static int +pcap_activate_npf(pcap_t *p) +{ + struct pcap_win *pw = p->priv; + NetType type; + int res; + int status = 0; + + if (p->opt.rfmon) { + /* + * Monitor mode is supported on Windows Vista and later. + */ + if (PacketGetMonitorMode(p->opt.device) == 1) + { + pw->rfmon_selfstart = 0; + } + else + { + if ((res = PacketSetMonitorMode(p->opt.device, 1)) != 1) + { + pw->rfmon_selfstart = 0; + // Monitor mode is not supported. + if (res == 0) + { + return PCAP_ERROR_RFMON_NOTSUP; + } + else + { + return PCAP_ERROR; + } + } + else + { + pw->rfmon_selfstart = 1; + } + } + } + + /* Init WinSock */ + pcap_wsockinit(); + + pw->adapter = PacketOpenAdapter(p->opt.device); + + if (pw->adapter == NULL) + { + DWORD errcode = GetLastError(); + + /* + * What error did we get when trying to open the adapter? + */ + if (errcode == ERROR_BAD_UNIT) { + /* + * There's no such device. + */ + return (PCAP_ERROR_NO_SUCH_DEVICE); + } else { + /* + * Unknown - report details. + */ + pcap_fmt_errmsg_for_win32_err(p->errbuf, PCAP_ERRBUF_SIZE, + errcode, "Error opening adapter"); + if (pw->rfmon_selfstart) + { + PacketSetMonitorMode(p->opt.device, 0); + } + return (PCAP_ERROR); + } + } + + /*get network type*/ + if(PacketGetNetType (pw->adapter,&type) == FALSE) + { + pcap_fmt_errmsg_for_win32_err(p->errbuf, PCAP_ERRBUF_SIZE, + GetLastError(), "Cannot determine the network type"); + goto bad; + } + + /*Set the linktype*/ + switch (type.LinkType) + { + case NdisMediumWan: + p->linktype = DLT_EN10MB; + break; + + case NdisMedium802_3: + p->linktype = DLT_EN10MB; + /* + * This is (presumably) a real Ethernet capture; give it a + * link-layer-type list with DLT_EN10MB and DLT_DOCSIS, so + * that an application can let you choose it, in case you're + * capturing DOCSIS traffic that a Cisco Cable Modem + * Termination System is putting out onto an Ethernet (it + * doesn't put an Ethernet header onto the wire, it puts raw + * DOCSIS frames out on the wire inside the low-level + * Ethernet framing). + */ + p->dlt_list = (u_int *) malloc(sizeof(u_int) * 2); + /* + * If that fails, just leave the list empty. + */ + if (p->dlt_list != NULL) { + p->dlt_list[0] = DLT_EN10MB; + p->dlt_list[1] = DLT_DOCSIS; + p->dlt_count = 2; + } + break; + + case NdisMediumFddi: + p->linktype = DLT_FDDI; + break; + + case NdisMedium802_5: + p->linktype = DLT_IEEE802; + break; + + case NdisMediumArcnetRaw: + p->linktype = DLT_ARCNET; + break; + + case NdisMediumArcnet878_2: + p->linktype = DLT_ARCNET; + break; + + case NdisMediumAtm: + p->linktype = DLT_ATM_RFC1483; + break; + + case NdisMediumCHDLC: + p->linktype = DLT_CHDLC; + break; + + case NdisMediumPPPSerial: + p->linktype = DLT_PPP_SERIAL; + break; + + case NdisMediumNull: + p->linktype = DLT_NULL; + break; + + case NdisMediumBare80211: + p->linktype = DLT_IEEE802_11; + break; + + case NdisMediumRadio80211: + p->linktype = DLT_IEEE802_11_RADIO; + break; + + case NdisMediumPpi: + p->linktype = DLT_PPI; + break; + +#ifdef NdisMediumWirelessWan + case NdisMediumWirelessWan: + p->linktype = DLT_RAW; + break; +#endif + + default: + /* + * An unknown medium type is assumed to supply Ethernet + * headers; if not, the user will have to report it, + * so that the medium type and link-layer header type + * can be determined. If we were to fail here, we + * might get the link-layer type in the error, but + * the user wouldn't get a capture, so we wouldn't + * be able to determine the link-layer type; we report + * a warning with the link-layer type, so at least + * some programs will report the warning. + */ + p->linktype = DLT_EN10MB; + pcap_snprintf(p->errbuf, PCAP_ERRBUF_SIZE, + "Unknown NdisMedium value %d, defaulting to DLT_EN10MB", + type.LinkType); + status = PCAP_WARNING; + break; + } + + /* + * Turn a negative snapshot value (invalid), a snapshot value of + * 0 (unspecified), or a value bigger than the normal maximum + * value, into the maximum allowed value. + * + * If some application really *needs* a bigger snapshot + * length, we should just increase MAXIMUM_SNAPLEN. + */ + if (p->snapshot <= 0 || p->snapshot > MAXIMUM_SNAPLEN) + p->snapshot = MAXIMUM_SNAPLEN; + + /* Set promiscuous mode */ + if (p->opt.promisc) + { + + if (PacketSetHwFilter(pw->adapter,NDIS_PACKET_TYPE_PROMISCUOUS) == FALSE) + { + pcap_snprintf(p->errbuf, PCAP_ERRBUF_SIZE, "failed to set hardware filter to promiscuous mode"); + goto bad; + } + } + else + { + /* NDIS_PACKET_TYPE_ALL_LOCAL selects "All packets sent by installed + * protocols and all packets indicated by the NIC" but if no protocol + * drivers (like TCP/IP) are installed, NDIS_PACKET_TYPE_DIRECTED, + * NDIS_PACKET_TYPE_BROADCAST, and NDIS_PACKET_TYPE_MULTICAST are needed to + * capture incoming frames. + */ + if (PacketSetHwFilter(pw->adapter, + NDIS_PACKET_TYPE_ALL_LOCAL | + NDIS_PACKET_TYPE_DIRECTED | + NDIS_PACKET_TYPE_BROADCAST | + NDIS_PACKET_TYPE_MULTICAST) == FALSE) + { + pcap_snprintf(p->errbuf, PCAP_ERRBUF_SIZE, "failed to set hardware filter to non-promiscuous mode"); + goto bad; + } + } + + /* Set the buffer size */ + p->bufsize = WIN32_DEFAULT_USER_BUFFER_SIZE; + + if(!(pw->adapter->Flags & INFO_FLAG_DAG_CARD)) + { + /* + * Traditional Adapter + */ + /* + * If the buffer size wasn't explicitly set, default to + * WIN32_DEFAULT_KERNEL_BUFFER_SIZE. + */ + if (p->opt.buffer_size == 0) + p->opt.buffer_size = WIN32_DEFAULT_KERNEL_BUFFER_SIZE; + + if(PacketSetBuff(pw->adapter,p->opt.buffer_size)==FALSE) + { + pcap_snprintf(p->errbuf, PCAP_ERRBUF_SIZE, "driver error: not enough memory to allocate the kernel buffer"); + goto bad; + } + + p->buffer = malloc(p->bufsize); + if (p->buffer == NULL) + { + pcap_fmt_errmsg_for_errno(p->errbuf, PCAP_ERRBUF_SIZE, + errno, "malloc"); + goto bad; + } + + if (p->opt.immediate) + { + /* tell the driver to copy the buffer as soon as data arrives */ + if(PacketSetMinToCopy(pw->adapter,0)==FALSE) + { + pcap_fmt_errmsg_for_win32_err(p->errbuf, + PCAP_ERRBUF_SIZE, GetLastError(), + "Error calling PacketSetMinToCopy"); + goto bad; + } + } + else + { + /* tell the driver to copy the buffer only if it contains at least 16K */ + if(PacketSetMinToCopy(pw->adapter,16000)==FALSE) + { + pcap_fmt_errmsg_for_win32_err(p->errbuf, + PCAP_ERRBUF_SIZE, GetLastError(), + "Error calling PacketSetMinToCopy"); + goto bad; + } + } + } else { + /* + * Dag Card + */ +#ifdef HAVE_DAG_API + /* + * We have DAG support. + */ + LONG status; + HKEY dagkey; + DWORD lptype; + DWORD lpcbdata; + int postype = 0; + char keyname[512]; + + pcap_snprintf(keyname, sizeof(keyname), "%s\\CardParams\\%s", + "SYSTEM\\CurrentControlSet\\Services\\DAG", + strstr(_strlwr(p->opt.device), "dag")); + do + { + status = RegOpenKeyEx(HKEY_LOCAL_MACHINE, keyname, 0, KEY_READ, &dagkey); + if(status != ERROR_SUCCESS) + break; + + status = RegQueryValueEx(dagkey, + "PosType", + NULL, + &lptype, + (char*)&postype, + &lpcbdata); + + if(status != ERROR_SUCCESS) + { + postype = 0; + } + + RegCloseKey(dagkey); + } + while(FALSE); + + + p->snapshot = PacketSetSnapLen(pw->adapter, p->snapshot); + + /* Set the length of the FCS associated to any packet. This value + * will be subtracted to the packet length */ + pw->dag_fcs_bits = pw->adapter->DagFcsLen; +#else /* HAVE_DAG_API */ + /* + * No DAG support. + */ + goto bad; +#endif /* HAVE_DAG_API */ + } + + PacketSetReadTimeout(pw->adapter, p->opt.timeout); + + /* disable loopback capture if requested */ + if (p->opt.nocapture_local) + { + if (!PacketSetLoopbackBehavior(pw->adapter, NPF_DISABLE_LOOPBACK)) + { + pcap_snprintf(p->errbuf, PCAP_ERRBUF_SIZE, + "Unable to disable the capture of loopback packets."); + goto bad; + } + } + +#ifdef HAVE_DAG_API + if(pw->adapter->Flags & INFO_FLAG_DAG_CARD) + { + /* install dag specific handlers for read and setfilter */ + p->read_op = pcap_read_win32_dag; + p->setfilter_op = pcap_setfilter_win32_dag; + } + else + { +#endif /* HAVE_DAG_API */ + /* install traditional npf handlers for read and setfilter */ + p->read_op = pcap_read_npf; + p->setfilter_op = pcap_setfilter_npf; +#ifdef HAVE_DAG_API + } +#endif /* HAVE_DAG_API */ + p->setdirection_op = NULL; /* Not implemented. */ + /* XXX - can this be implemented on some versions of Windows? */ + p->inject_op = pcap_inject_npf; + p->set_datalink_op = NULL; /* can't change data link type */ + p->getnonblock_op = pcap_getnonblock_npf; + p->setnonblock_op = pcap_setnonblock_npf; + p->stats_op = pcap_stats_npf; + p->stats_ex_op = pcap_stats_ex_npf; + p->setbuff_op = pcap_setbuff_npf; + p->setmode_op = pcap_setmode_npf; + p->setmintocopy_op = pcap_setmintocopy_npf; + p->getevent_op = pcap_getevent_npf; + p->oid_get_request_op = pcap_oid_get_request_npf; + p->oid_set_request_op = pcap_oid_set_request_npf; + p->sendqueue_transmit_op = pcap_sendqueue_transmit_npf; + p->setuserbuffer_op = pcap_setuserbuffer_npf; + p->live_dump_op = pcap_live_dump_npf; + p->live_dump_ended_op = pcap_live_dump_ended_npf; + p->get_airpcap_handle_op = pcap_get_airpcap_handle_npf; + p->cleanup_op = pcap_cleanup_npf; + + /* + * XXX - this is only done because WinPcap supported + * pcap_fileno() returning the hFile HANDLE from the + * ADAPTER structure. We make no general guarantees + * that the caller can do anything useful with it. + * + * (Not that we make any general guarantee of that + * sort on UN*X, either, any more, given that not + * all capture devices are regular OS network + * interfaces.) + */ + p->handle = pw->adapter->hFile; + + return (status); +bad: + pcap_cleanup_npf(p); + return (PCAP_ERROR); +} + +/* +* Check if rfmon mode is supported on the pcap_t for Windows systems. +*/ +static int +pcap_can_set_rfmon_npf(pcap_t *p) +{ + return (PacketIsMonitorModeSupported(p->opt.device) == 1); +} + +pcap_t * +pcap_create_interface(const char *device _U_, char *ebuf) +{ + pcap_t *p; + + p = pcap_create_common(ebuf, sizeof(struct pcap_win)); + if (p == NULL) + return (NULL); + + p->activate_op = pcap_activate_npf; + p->can_set_rfmon_op = pcap_can_set_rfmon_npf; + return (p); +} + +static int +pcap_setfilter_npf(pcap_t *p, struct bpf_program *fp) +{ + struct pcap_win *pw = p->priv; + + if(PacketSetBpf(pw->adapter,fp)==FALSE){ + /* + * Kernel filter not installed. + * + * XXX - we don't know whether this failed because: + * + * the kernel rejected the filter program as invalid, + * in which case we should fall back on userland + * filtering; + * + * the kernel rejected the filter program as too big, + * in which case we should again fall back on + * userland filtering; + * + * there was some other problem, in which case we + * should probably report an error. + * + * For NPF devices, the Win32 status will be + * STATUS_INVALID_DEVICE_REQUEST for invalid + * filters, but I don't know what it'd be for + * other problems, and for some other devices + * it might not be set at all. + * + * So we just fall back on userland filtering in + * all cases. + */ + + /* + * install_bpf_program() validates the program. + * + * XXX - what if we already have a filter in the kernel? + */ + if (install_bpf_program(p, fp) < 0) + return (-1); + pw->filtering_in_kernel = 0; /* filtering in userland */ + return (0); + } + + /* + * It worked. + */ + pw->filtering_in_kernel = 1; /* filtering in the kernel */ + + /* + * Discard any previously-received packets, as they might have + * passed whatever filter was formerly in effect, but might + * not pass this filter (BIOCSETF discards packets buffered + * in the kernel, so you can lose packets in any case). + */ + p->cc = 0; + return (0); +} + +/* + * We filter at user level, since the kernel driver does't process the packets + */ +static int +pcap_setfilter_win32_dag(pcap_t *p, struct bpf_program *fp) { + + if(!fp) + { + pcap_strlcpy(p->errbuf, "setfilter: No filter specified", sizeof(p->errbuf)); + return (-1); + } + + /* Install a user level filter */ + if (install_bpf_program(p, fp) < 0) + return (-1); + + return (0); +} + +static int +pcap_getnonblock_npf(pcap_t *p) +{ + struct pcap_win *pw = p->priv; + + /* + * XXX - if there were a PacketGetReadTimeout() call, we + * would use it, and return 1 if the timeout is -1 + * and 0 otherwise. + */ + return (pw->nonblock); +} + +static int +pcap_setnonblock_npf(pcap_t *p, int nonblock) +{ + struct pcap_win *pw = p->priv; + int newtimeout; + + if (nonblock) { + /* + * Set the packet buffer timeout to -1 for non-blocking + * mode. + */ + newtimeout = -1; + } else { + /* + * Restore the timeout set when the device was opened. + * (Note that this may be -1, in which case we're not + * really leaving non-blocking mode. However, although + * the timeout argument to pcap_set_timeout() and + * pcap_open_live() is an int, you're not supposed to + * supply a negative value, so that "shouldn't happen".) + */ + newtimeout = p->opt.timeout; + } + if (!PacketSetReadTimeout(pw->adapter, newtimeout)) { + pcap_fmt_errmsg_for_win32_err(p->errbuf, PCAP_ERRBUF_SIZE, + GetLastError(), "PacketSetReadTimeout"); + return (-1); + } + pw->nonblock = (newtimeout == -1); + return (0); +} + +static int +pcap_add_if_npf(pcap_if_list_t *devlistp, char *name, bpf_u_int32 flags, + const char *description, 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. + */ + curdev = add_dev(devlistp, name, flags, description, errbuf); + if (curdev == NULL) { + /* + * 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. + */ + 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); +} + +static int +get_if_flags(const char *name, bpf_u_int32 *flags, char *errbuf) +{ + char *name_copy; + ADAPTER *adapter; + int status; + size_t len; + NDIS_HARDWARE_STATUS hardware_status; +#ifdef OID_GEN_PHYSICAL_MEDIUM + NDIS_PHYSICAL_MEDIUM phys_medium; + bpf_u_int32 gen_physical_medium_oids[] = { + #ifdef OID_GEN_PHYSICAL_MEDIUM_EX + OID_GEN_PHYSICAL_MEDIUM_EX, + #endif + OID_GEN_PHYSICAL_MEDIUM + }; +#define N_GEN_PHYSICAL_MEDIUM_OIDS (sizeof gen_physical_medium_oids / sizeof gen_physical_medium_oids[0]) + size_t i; +#endif /* OID_GEN_PHYSICAL_MEDIUM */ +#ifdef OID_GEN_LINK_STATE + NDIS_LINK_STATE link_state; +#endif + int connect_status; + + if (*flags & PCAP_IF_LOOPBACK) { + /* + * Loopback interface, so the connection status doesn't + * apply. and it's not wireless (or wired, for that + * matter...). We presume it's up and running. + */ + *flags |= PCAP_IF_UP | PCAP_IF_RUNNING | PCAP_IF_CONNECTION_STATUS_NOT_APPLICABLE; + return (0); + } + + /* + * We need to open the adapter to get this information. + * + * XXX - PacketOpenAdapter() takes a non-const pointer + * as an argument, so we make a copy of the argument and + * pass that to it. + */ + name_copy = strdup(name); + adapter = PacketOpenAdapter(name_copy); + free(name_copy); + if (adapter == NULL) { + /* + * Give up; if they try to open this device, it'll fail. + */ + return (0); + } + +#ifdef HAVE_AIRPCAP_API + /* + * Airpcap.sys do not support the below 'OID_GEN_x' values. + * Just set these flags (and none of the '*flags' entered with). + */ + if (PacketGetAirPcapHandle(adapter)) { + /* + * Must be "up" and "running" if the above if succeeded. + */ + *flags = PCAP_IF_UP | PCAP_IF_RUNNING; + + /* + * An airpcap device is a wireless device (duh!) + */ + *flags |= PCAP_IF_WIRELESS; + + /* + * A "network assosiation state" makes no sense for airpcap. + */ + *flags |= PCAP_IF_CONNECTION_STATUS_NOT_APPLICABLE; + PacketCloseAdapter(adapter); + return (0); + } +#endif + + /* + * Get the hardware status, and derive "up" and "running" from + * that. + */ + len = sizeof (hardware_status); + status = oid_get_request(adapter, OID_GEN_HARDWARE_STATUS, + &hardware_status, &len, errbuf); + if (status == 0) { + switch (hardware_status) { + + case NdisHardwareStatusReady: + /* + * "Available and capable of sending and receiving + * data over the wire", so up and running. + */ + *flags |= PCAP_IF_UP | PCAP_IF_RUNNING; + break; + + case NdisHardwareStatusInitializing: + case NdisHardwareStatusReset: + /* + * "Initializing" or "Resetting", so up, but + * not running. + */ + *flags |= PCAP_IF_UP; + break; + + case NdisHardwareStatusClosing: + case NdisHardwareStatusNotReady: + /* + * "Closing" or "Not ready", so neither up nor + * running. + */ + break; + } + } else { + /* + * Can't get the hardware status, so assume both up and + * running. + */ + *flags |= PCAP_IF_UP | PCAP_IF_RUNNING; + } + + /* + * Get the network type. + */ +#ifdef OID_GEN_PHYSICAL_MEDIUM + /* + * Try the OIDs we have for this, in order. + */ + for (i = 0; i < N_GEN_PHYSICAL_MEDIUM_OIDS; i++) { + len = sizeof (phys_medium); + status = oid_get_request(adapter, gen_physical_medium_oids[i], + &phys_medium, &len, errbuf); + if (status == 0) { + /* + * Success. + */ + break; + } + /* + * Failed. We can't determine whether it failed + * because that particular OID isn't supported + * or because some other problem occurred, so we + * just drive on and try the next OID. + */ + } + if (status == 0) { + /* + * We got the physical medium. + */ + switch (phys_medium) { + + case NdisPhysicalMediumWirelessLan: + case NdisPhysicalMediumWirelessWan: + case NdisPhysicalMediumNative802_11: + case NdisPhysicalMediumBluetooth: + case NdisPhysicalMediumUWB: + case NdisPhysicalMediumIrda: + /* + * Wireless. + */ + *flags |= PCAP_IF_WIRELESS; + break; + + default: + /* + * Not wireless. + */ + break; + } + } +#endif + + /* + * Get the connection status. + */ +#ifdef OID_GEN_LINK_STATE + len = sizeof(link_state); + status = oid_get_request(adapter, OID_GEN_LINK_STATE, &link_state, + &len, errbuf); + if (status == 0) { + /* + * NOTE: this also gives us the receive and transmit + * link state. + */ + switch (link_state.MediaConnectState) { + + case MediaConnectStateConnected: + /* + * It's connected. + */ + *flags |= PCAP_IF_CONNECTION_STATUS_CONNECTED; + break; + + case MediaConnectStateDisconnected: + /* + * It's disconnected. + */ + *flags |= PCAP_IF_CONNECTION_STATUS_DISCONNECTED; + break; + } + } +#else + /* + * OID_GEN_LINK_STATE isn't supported because it's not in our SDK. + */ + status = -1; +#endif + if (status == -1) { + /* + * OK, OID_GEN_LINK_STATE didn't work, try + * OID_GEN_MEDIA_CONNECT_STATUS. + */ + status = oid_get_request(adapter, OID_GEN_MEDIA_CONNECT_STATUS, + &connect_status, &len, errbuf); + if (status == 0) { + switch (connect_status) { + + case NdisMediaStateConnected: + /* + * It's connected. + */ + *flags |= PCAP_IF_CONNECTION_STATUS_CONNECTED; + break; + + case NdisMediaStateDisconnected: + /* + * It's disconnected. + */ + *flags |= PCAP_IF_CONNECTION_STATUS_DISCONNECTED; + break; + } + } + } + PacketCloseAdapter(adapter); + return (0); +} + +int +pcap_platform_finddevs(pcap_if_list_t *devlistp, char *errbuf) +{ + 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) + { + pcap_fmt_errmsg_for_win32_err(errbuf, PCAP_ERRBUF_SIZE, + last_error, "PacketGetAdapterNames"); + return (-1); + } + } + + if (NameLength <= 0) + return 0; + AdaptersName = (char*) malloc(NameLength); + if (AdaptersName == NULL) + { + pcap_snprintf(errbuf, PCAP_ERRBUF_SIZE, "Cannot allocate enough memory to list the adapters."); + return (-1); + } + + if (!PacketGetAdapterNames(AdaptersName, &NameLength)) { + pcap_fmt_errmsg_for_win32_err(errbuf, PCAP_ERRBUF_SIZE, + GetLastError(), "PacketGetAdapterNames"); + 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') { + bpf_u_int32 flags = 0; +#ifdef HAVE_PACKET_IS_LOOPBACK_ADAPTER + /* + * Is this a loopback interface? + */ + if (PacketIsLoopbackAdapter(name)) { + /* Yes */ + flags |= PCAP_IF_LOOPBACK; + } +#endif + /* + * Get additional flags. + */ + if (get_if_flags(name, &flags, errbuf) == -1) { + /* + * Failure. + */ + ret = -1; + break; + } + + /* + * Add an entry for this interface. + */ + if (pcap_add_if_npf(devlistp, name, flags, desc, + errbuf) == -1) { + /* + * Failure. + */ + ret = -1; + break; + } + name += strlen(name) + 1; + desc += strlen(desc) + 1; + } + + free(AdaptersName); + return (ret); +} + +/* + * Return the name of a network interface attached to the system, or NULL + * if none can be found. The interface must be configured up; the + * lowest unit number is preferred; loopback is ignored. + * + * In the best of all possible worlds, this would be the same as on + * UN*X, but there may be software that expects this to return a + * full list of devices after the first device. + */ +#define ADAPTERSNAME_LEN 8192 +char * +pcap_lookupdev(char *errbuf) +{ + DWORD dwVersion; + DWORD dwWindowsMajorVersion; + +#pragma warning (push) +#pragma warning (disable: 4996) /* disable MSVC's GetVersion() deprecated warning here */ + dwVersion = GetVersion(); /* get the OS version */ +#pragma warning (pop) + dwWindowsMajorVersion = (DWORD)(LOBYTE(LOWORD(dwVersion))); + + if (dwVersion >= 0x80000000 && dwWindowsMajorVersion >= 4) { + /* + * Windows 95, 98, ME. + */ + ULONG NameLength = ADAPTERSNAME_LEN; + static char AdaptersName[ADAPTERSNAME_LEN]; + + if (PacketGetAdapterNames(AdaptersName,&NameLength) ) + return (AdaptersName); + else + return NULL; + } else { + /* + * Windows NT (NT 4.0 and later). + * Convert the names to Unicode for backward compatibility. + */ + ULONG NameLength = ADAPTERSNAME_LEN; + static WCHAR AdaptersName[ADAPTERSNAME_LEN]; + size_t BufferSpaceLeft; + char *tAstr; + WCHAR *Unameptr; + char *Adescptr; + size_t namelen, i; + WCHAR *TAdaptersName = (WCHAR*)malloc(ADAPTERSNAME_LEN * sizeof(WCHAR)); + int NAdapts = 0; + + if(TAdaptersName == NULL) + { + (void)pcap_snprintf(errbuf, PCAP_ERRBUF_SIZE, "memory allocation failure"); + return NULL; + } + + if ( !PacketGetAdapterNames((PTSTR)TAdaptersName,&NameLength) ) + { + pcap_fmt_errmsg_for_win32_err(errbuf, PCAP_ERRBUF_SIZE, + GetLastError(), "PacketGetAdapterNames"); + free(TAdaptersName); + return NULL; + } + + + BufferSpaceLeft = ADAPTERSNAME_LEN * sizeof(WCHAR); + tAstr = (char*)TAdaptersName; + Unameptr = AdaptersName; + + /* + * Convert the device names to Unicode into AdapterName. + */ + do { + /* + * Length of the name, including the terminating + * NUL. + */ + namelen = strlen(tAstr) + 1; + + /* + * Do we have room for the name in the Unicode + * buffer? + */ + if (BufferSpaceLeft < namelen * sizeof(WCHAR)) { + /* + * No. + */ + goto quit; + } + BufferSpaceLeft -= namelen * sizeof(WCHAR); + + /* + * Copy the name, converting ASCII to Unicode. + * namelen includes the NUL, so we copy it as + * well. + */ + for (i = 0; i < namelen; i++) + *Unameptr++ = *tAstr++; + + /* + * Count this adapter. + */ + NAdapts++; + } while (namelen != 1); + + /* + * Copy the descriptions, but don't convert them from + * ASCII to Unicode. + */ + Adescptr = (char *)Unameptr; + while(NAdapts--) + { + size_t desclen; + + desclen = strlen(tAstr) + 1; + + /* + * Do we have room for the name in the Unicode + * buffer? + */ + if (BufferSpaceLeft < desclen) { + /* + * No. + */ + goto quit; + } + + /* + * Just copy the ASCII string. + * namelen includes the NUL, so we copy it as + * well. + */ + memcpy(Adescptr, tAstr, desclen); + Adescptr += desclen; + tAstr += desclen; + BufferSpaceLeft -= desclen; + } + + quit: + free(TAdaptersName); + return (char *)(AdaptersName); + } +} + +/* + * We can't use the same code that we use on UN*X, as that's doing + * UN*X-specific calls. + * + * We don't just fetch the entire list of devices, search for the + * particular device, and use its first IPv4 address, as that's too + * much work to get just one device's netmask. + */ +int +pcap_lookupnet(const char *device, bpf_u_int32 *netp, bpf_u_int32 *maskp, + char *errbuf) +{ + /* + * We need only the first IPv4 address, so we must scan the array returned by PacketGetNetInfo() + * in order to skip non IPv4 (i.e. IPv6 addresses) + */ + npf_if_addr if_addrs[MAX_NETWORK_ADDRESSES]; + LONG if_addr_size = MAX_NETWORK_ADDRESSES; + struct sockaddr_in *t_addr; + LONG i; + + if (!PacketGetNetInfoEx((void *)device, if_addrs, &if_addr_size)) { + *netp = *maskp = 0; + return (0); + } + + for(i = 0; i < if_addr_size; i++) + { + if(if_addrs[i].IPAddress.ss_family == AF_INET) + { + t_addr = (struct sockaddr_in *) &(if_addrs[i].IPAddress); + *netp = t_addr->sin_addr.S_un.S_addr; + t_addr = (struct sockaddr_in *) &(if_addrs[i].SubnetMask); + *maskp = t_addr->sin_addr.S_un.S_addr; + + *netp &= *maskp; + return (0); + } + + } + + *netp = *maskp = 0; + return (0); +} + +static const char *pcap_lib_version_string; + +#ifdef HAVE_VERSION_H +/* + * libpcap being built for Windows, as part of a WinPcap/Npcap source + * tree. Include version.h from that source tree to get the WinPcap/Npcap + * version. + * + * XXX - it'd be nice if we could somehow generate the WinPcap/Npcap version + * number when building as part of WinPcap/Npcap. (It'd be nice to do so + * for the packet.dll version number as well.) + */ +#include "../../version.h" + +static const char pcap_version_string[] = + WINPCAP_PRODUCT_NAME " version " WINPCAP_VER_STRING ", based on " PCAP_VERSION_STRING; + +const char * +pcap_lib_version(void) +{ + if (pcap_lib_version_string == NULL) { + /* + * Generate the version string. + */ + char *packet_version_string = PacketGetVersion(); + + if (strcmp(WINPCAP_VER_STRING, packet_version_string) == 0) { + /* + * WinPcap/Npcap version string and packet.dll version + * string are the same; just report the WinPcap/Npcap + * version. + */ + pcap_lib_version_string = pcap_version_string; + } else { + /* + * WinPcap/Npcap version string and packet.dll version + * string are different; that shouldn't be the + * case (the two libraries should come from the + * same version of WinPcap/Npcap), so we report both + * versions. + */ + char *full_pcap_version_string; + + if (pcap_asprintf(&full_pcap_version_string, + WINPCAP_PRODUCT_NAME " version " WINPCAP_VER_STRING " (packet.dll version %s), based on " PCAP_VERSION_STRING, + packet_version_string) != -1) { + /* Success */ + pcap_lib_version_string = full_pcap_version_string; + } + } + } + return (pcap_lib_version_string); +} + +#else /* HAVE_VERSION_H */ + +/* + * libpcap being built for Windows, not as part of a WinPcap/Npcap source + * tree. + */ +const char * +pcap_lib_version(void) +{ + if (pcap_lib_version_string == NULL) { + /* + * Generate the version string. Report the packet.dll + * version. + */ + char *full_pcap_version_string; + + if (pcap_asprintf(&full_pcap_version_string, + PCAP_VERSION_STRING " (packet.dll version %s)", + PacketGetVersion()) != -1) { + /* Success */ + pcap_lib_version_string = full_pcap_version_string; + } + } + return (pcap_lib_version_string); +} +#endif /* HAVE_VERSION_H */ |