void
summary_fill_in_capture(capture_file *cf,capture_options *capture_opts, summary_tally *st)
{
iface_options iface;
interface_t device;
guint i;
if (st->ifaces->len == 0) {
/*
* XXX - do this only if we have a live capture.
*/
for (i = 0; i < capture_opts->all_ifaces->len; i++) {
device = g_array_index(capture_opts->all_ifaces, interface_t, i);
if (!device.selected) {
continue;
}
iface.cfilter = g_strdup(device.cfilter);
iface.name = g_strdup(device.name);
iface.descr = g_strdup(device.display_name);
iface.drops_known = cf->drops_known;
iface.drops = cf->drops;
iface.has_snap = device.has_snaplen;
iface.snap = device.snaplen;
iface.encap_type = wtap_pcap_encap_to_wtap_encap(device.active_dlt);
g_array_append_val(st->ifaces, iface);
}
}
}
/**
* Parse a link-type argument of the form "encap:<pcap dlt>" or
* "proto:<proto name>". "Pcap dlt" must be a name conforming to
* pcap_datalink_name_to_val() or an integer. "Proto name" must be
* a protocol name, e.g. "http".
*/
static gboolean
set_link_type(const char *lt_arg) {
char *spec_ptr = strchr(lt_arg, ':');
char *p;
int dlt_val;
long val;
dissector_handle_t dhandle;
GString *pref_str;
if (!spec_ptr)
return FALSE;
spec_ptr++;
if (strncmp(lt_arg, "encap:", strlen("encap:")) == 0) {
dlt_val = linktype_name_to_val(spec_ptr);
if (dlt_val == -1) {
errno = 0;
val = strtol(spec_ptr, &p, 10);
if (p == spec_ptr || *p != '\0' || errno != 0 || val > INT_MAX) {
return FALSE;
}
dlt_val = (int)val;
}
encap = wtap_pcap_encap_to_wtap_encap(dlt_val);
if (encap == WTAP_ENCAP_UNKNOWN) {
return FALSE;
}
return TRUE;
} else if (strncmp(lt_arg, "proto:", strlen("proto:")) == 0) {
dhandle = find_dissector(spec_ptr);
if (dhandle) {
encap = WTAP_ENCAP_USER0;
pref_str = g_string_new("uat:user_dlts:");
/* This must match the format used in the user_dlts file */
g_string_append_printf(pref_str,
"\"User 0 (DLT=147)\",\"%s\",\"0\",\"\",\"0\",\"\"",
spec_ptr);
if (prefs_set_pref(pref_str->str) != PREFS_SET_OK) {
g_string_free(pref_str, TRUE);
return FALSE;
}
g_string_free(pref_str, TRUE);
return TRUE;
}
}
return FALSE;
}
/**
Parses information from global pcap header to a wiretap header structure
@param in_data packet data with pcap file structure(contains both pcap global header and pcap packet header at the beginning)
@param wth wiretap header structure to store extracted information
@return whether the parse process was succesfull or not
*/
int hf_parse_global_header(wtap* wth, unsigned char *in_data)
{
// guard magic number represents 0xa1b2c3d4
const guint32 magic_ctrl = 2712847316;
// the magic number read from in_data
guint32 magic;
// pcap header structure to store read information
struct pcap_hdr hdr;
// in fact, the following reading block is just a "guarding thing" and can be left out when we are sure
// that the data we read are ok...we just need to set data_offset and hardcode some wth->x properties accordingly then
// check the magic value at the beginning of the data stream
magic = *((guint32 *)in_data);
if(magic != magic_ctrl) {
return HF_DISSECT_ERR;
}
// we need to move the data offset after each read accordingly
wth->data_offset += sizeof magic;
wth->tsprecision = WTAP_FILE_TSPREC_USEC;
// magic number not included, so we need to move first...check the move step if it is ok
in_data += sizeof magic;
hdr = *((pcap_hdr *)in_data);
wth->data_offset += sizeof hdr;
// wth represents a fake libpcap file...some of these might be touched during dissection so we fill them in appropriately
wth->capture.pcap = (libpcap_t *)g_malloc(sizeof(libpcap_t));
wth->capture.pcap->byte_swapped = FALSE;
wth->capture.pcap->version_major = hdr.version_major;
wth->capture.pcap->version_minor = hdr.version_minor;
// since there is no actual file, we set pointers to file access functions to NULL
wth->subtype_read = NULL;
wth->subtype_seek_read = NULL;
wth->subtype_close = NULL;
// properties of fake file, these need to be set the same as for the ethernet packets in a pcap file
wth->file_encap = wtap_pcap_encap_to_wtap_encap(hdr.network);
wth->snapshot_length = hdr.snaplen;
wth->capture.pcap->lengths_swapped = NOT_SWAPPED;
wth->file_type = WTAP_FILE_PCAP;
return HF_DISSECT_OK;
}
wtap_open_return_val libpcap_open(wtap *wth, int *err, gchar **err_info)
{
guint32 magic;
struct pcap_hdr hdr;
gboolean byte_swapped;
gboolean modified;
gboolean aix;
int file_encap;
gint64 first_packet_offset;
libpcap_t *libpcap;
static const int subtypes_modified[] = {
WTAP_FILE_TYPE_SUBTYPE_PCAP_SS991029,
WTAP_FILE_TYPE_SUBTYPE_PCAP_SS990915
};
#define N_SUBTYPES_MODIFIED G_N_ELEMENTS(subtypes_modified)
static const int subtypes_standard[] = {
WTAP_FILE_TYPE_SUBTYPE_PCAP,
WTAP_FILE_TYPE_SUBTYPE_PCAP_SS990417,
WTAP_FILE_TYPE_SUBTYPE_PCAP_NOKIA
};
#define N_SUBTYPES_STANDARD G_N_ELEMENTS(subtypes_standard)
static const int subtypes_nsec[] = {
WTAP_FILE_TYPE_SUBTYPE_PCAP_NSEC
};
#define N_SUBTYPES_NSEC G_N_ELEMENTS(subtypes_nsec)
#define MAX_FIGURES_OF_MERIT \
MAX(MAX(N_SUBTYPES_MODIFIED, N_SUBTYPES_STANDARD), N_SUBTYPES_NSEC)
int figures_of_merit[MAX_FIGURES_OF_MERIT];
const int *subtypes;
int n_subtypes;
int best_subtype;
int i;
/* Read in the number that should be at the start of a "libpcap" file */
if (!wtap_read_bytes(wth->fh, &magic, sizeof magic, err, err_info)) {
if (*err != WTAP_ERR_SHORT_READ)
return WTAP_OPEN_ERROR;
return WTAP_OPEN_NOT_MINE;
}
switch (magic) {
case PCAP_MAGIC:
/* Host that wrote it has our byte order, and was running
a program using either standard or ss990417 libpcap. */
byte_swapped = FALSE;
modified = FALSE;
wth->file_tsprec = WTAP_TSPREC_USEC;
break;
case PCAP_MODIFIED_MAGIC:
/* Host that wrote it has our byte order, and was running
a program using either ss990915 or ss991029 libpcap. */
byte_swapped = FALSE;
modified = TRUE;
wth->file_tsprec = WTAP_TSPREC_USEC;
break;
case PCAP_SWAPPED_MAGIC:
/* Host that wrote it has a byte order opposite to ours,
and was running a program using either standard or
ss990417 libpcap. */
byte_swapped = TRUE;
modified = FALSE;
wth->file_tsprec = WTAP_TSPREC_USEC;
break;
case PCAP_SWAPPED_MODIFIED_MAGIC:
/* Host that wrote it out has a byte order opposite to
ours, and was running a program using either ss990915
or ss991029 libpcap. */
byte_swapped = TRUE;
modified = TRUE;
wth->file_tsprec = WTAP_TSPREC_USEC;
break;
case PCAP_NSEC_MAGIC:
/* Host that wrote it has our byte order, and was writing
the file in a format similar to standard libpcap
except that the time stamps have nanosecond resolution. */
byte_swapped = FALSE;
modified = FALSE;
wth->file_tsprec = WTAP_TSPREC_NSEC;
break;
case PCAP_SWAPPED_NSEC_MAGIC:
/* Host that wrote it out has a byte order opposite to
ours, and was writing the file in a format similar to
standard libpcap except that the time stamps have
nanosecond resolution. */
byte_swapped = TRUE;
modified = FALSE;
wth->file_tsprec = WTAP_TSPREC_NSEC;
break;
default:
/* Not a "libpcap" type we know about. */
return WTAP_OPEN_NOT_MINE;
}
/* Read the rest of the header. */
if (!wtap_read_bytes(wth->fh, &hdr, sizeof hdr, err, err_info))
return WTAP_OPEN_ERROR;
if (byte_swapped) {
/* Byte-swap the header fields about which we care. */
hdr.version_major = GUINT16_SWAP_LE_BE(hdr.version_major);
hdr.version_minor = GUINT16_SWAP_LE_BE(hdr.version_minor);
hdr.snaplen = GUINT32_SWAP_LE_BE(hdr.snaplen);
hdr.network = GUINT32_SWAP_LE_BE(hdr.network);
}
if (hdr.version_major < 2) {
/* We only support version 2.0 and later. */
*err = WTAP_ERR_UNSUPPORTED;
*err_info = g_strdup_printf("pcap: major version %u unsupported",
hdr.version_major);
return WTAP_OPEN_ERROR;
}
/*
* AIX's non-standard tcpdump uses a minor version number of 2.
* Unfortunately, older versions of libpcap might have used
* that as well.
*
* The AIX libpcap uses RFC 1573 ifType values rather than
* DLT_ values in the header; the ifType values for LAN devices
* are:
*
* Ethernet 6
* Token Ring 9
* FDDI 15
*
* which correspond to DLT_IEEE802 (used for Token Ring),
* DLT_PPP, and DLT_SLIP_BSDOS, respectively. The ifType value
* for a loopback interface is 24, which currently isn't
* used by any version of libpcap I know about (and, as
* tcpdump.org are assigning DLT_ values above 100, and
* NetBSD started assigning values starting at 50, and
* the values chosen by other libpcaps appear to stop at
* 19, it's probably not going to be used by any libpcap
* in the future).
*
* We shall assume that if the minor version number is 2, and
* the network type is 6, 9, 15, or 24, that it's AIX libpcap.
*
* I'm assuming those older versions of libpcap didn't
* use DLT_IEEE802 for Token Ring, and didn't use DLT_SLIP_BSDOS
* as that came later. It may have used DLT_PPP, however, in
* which case we're out of luck; we assume it's Token Ring
* in AIX libpcap rather than PPP in standard libpcap, as
* you're probably more likely to be handing an AIX libpcap
* token-ring capture than an old (pre-libpcap 0.4) PPP capture
* to Wireshark.
*/
aix = FALSE; /* assume it's not AIX */
if (hdr.version_major == 2 && hdr.version_minor == 2) {
switch (hdr.network) {
case 6:
hdr.network = 1; /* DLT_EN10MB, Ethernet */
aix = TRUE;
break;
case 9:
hdr.network = 6; /* DLT_IEEE802, Token Ring */
aix = TRUE;
break;
case 15:
hdr.network = 10; /* DLT_FDDI, FDDI */
aix = TRUE;
break;
case 24:
hdr.network = 0; /* DLT_NULL, loopback */
aix = TRUE;
break;
}
}
file_encap = wtap_pcap_encap_to_wtap_encap(hdr.network);
if (file_encap == WTAP_ENCAP_UNKNOWN) {
*err = WTAP_ERR_UNSUPPORTED;
*err_info = g_strdup_printf("pcap: network type %u unknown or unsupported",
hdr.network);
return WTAP_OPEN_ERROR;
}
/* This is a libpcap file */
libpcap = (libpcap_t *)g_malloc(sizeof(libpcap_t));
libpcap->byte_swapped = byte_swapped;
libpcap->version_major = hdr.version_major;
libpcap->version_minor = hdr.version_minor;
wth->priv = (void *)libpcap;
wth->subtype_read = libpcap_read;
wth->subtype_seek_read = libpcap_seek_read;
wth->file_encap = file_encap;
wth->snapshot_length = hdr.snaplen;
/* In file format version 2.3, the order of the "incl_len" and
"orig_len" fields in the per-packet header was reversed,
in order to match the BPF header layout.
Therefore, in files with versions prior to that, we must swap
those two fields.
Unfortunately, some files were, according to a comment in the
"libpcap" source, written with version 2.3 in their headers
but without the interchanged fields, so if "incl_len" is
greater than "orig_len" - which would make no sense - we
assume that we need to swap them in version 2.3 files
as well.
In addition, DG/UX's tcpdump uses version 543.0, and writes
the two fields in the pre-2.3 order. */
switch (hdr.version_major) {
case 2:
if (hdr.version_minor < 3)
libpcap->lengths_swapped = SWAPPED;
else if (hdr.version_minor == 3)
libpcap->lengths_swapped = MAYBE_SWAPPED;
else
libpcap->lengths_swapped = NOT_SWAPPED;
break;
case 543:
libpcap->lengths_swapped = SWAPPED;
break;
default:
libpcap->lengths_swapped = NOT_SWAPPED;
break;
}
/*
* Is this AIX format?
*/
if (aix) {
/*
* Yes. Skip all the tests for other mutant formats,
* and for the ERF link-layer header type, and set the
* precision to nanosecond precision.
*/
wth->file_type_subtype = WTAP_FILE_TYPE_SUBTYPE_PCAP_AIX;
wth->file_tsprec = WTAP_TSPREC_NSEC;
return WTAP_OPEN_MINE;
}
/*
* No. Let's look at the header for the first record,
* and see if, interpreting it as a standard header (if the
* magic number was standard) or a modified header (if the
* magic number was modified), the position where it says the
* header for the *second* record is contains a corrupted header.
*
* If so, then:
*
* If this file had the standard magic number, it may be
* an ss990417 capture file - in that version of Alexey's
* patch, the packet header format was changed but the
* magic number wasn't, and, alas, Red Hat appear to have
* picked up that version of the patch for RH 6.1, meaning
* RH 6.1 has a tcpdump that writes out files that can't
* be read by any software that expects non-modified headers
* if the magic number isn't the modified magic number (e.g.,
* any normal version of tcpdump, and Wireshark if we don't
* do this gross heuristic).
*
* If this file had the modified magic number, it may be
* an ss990915 capture file - in that version of Alexey's
* patch, the magic number was changed, but the record
* header had some extra fields, and, alas, SuSE appear
* to have picked up that version of the patch for SuSE
* 6.3, meaning that programs expecting the standard per-
* packet header in captures with the modified magic number
* can't read dumps from its tcpdump.
*
* Oh, and if it has the standard magic number, it might, instead,
* be a Nokia libpcap file, so we may need to try that if
* neither normal nor ss990417 headers work.
*/
if (modified) {
/*
* Well, we have the magic number from Alexey's
* later two patches. Try the subtypes for that.
*/
subtypes = subtypes_modified;
n_subtypes = N_SUBTYPES_MODIFIED;
} else {
if (wth->file_tsprec == WTAP_TSPREC_NSEC) {
/*
* We have nanosecond-format libpcap's magic
* number. Try the subtypes for that.
*/
subtypes = subtypes_nsec;
n_subtypes = N_SUBTYPES_NSEC;
} else {
/*
* We have the regular libpcap magic number.
* Try the subtypes for that.
*/
subtypes = subtypes_standard;
n_subtypes = N_SUBTYPES_STANDARD;
}
}
/*
* Try all the subtypes.
*/
first_packet_offset = file_tell(wth->fh);
for (i = 0; i < n_subtypes; i++) {
wth->file_type_subtype = subtypes[i];
figures_of_merit[i] = libpcap_try(wth, err, err_info);
if (figures_of_merit[i] == -1) {
/*
* Well, we couldn't even read it.
* Give up.
*/
return WTAP_OPEN_ERROR;
}
if (figures_of_merit[i] == 0) {
/*
* This format doesn't have any issues.
* Put the seek pointer back, and finish.
*/
if (file_seek(wth->fh, first_packet_offset, SEEK_SET, err) == -1) {
return WTAP_OPEN_ERROR;
}
goto done;
}
/*
* OK, we've recorded the figure of merit for this one;
* go back to the first packet and try the next one.
*/
if (file_seek(wth->fh, first_packet_offset, SEEK_SET, err) == -1) {
return WTAP_OPEN_ERROR;
}
}
/*
* OK, none are perfect; let's see which one is least bad.
*/
best_subtype = INT_MAX;
for (i = 0; i < n_subtypes; i++) {
/*
* Is this subtype better than the last one we saw?
*/
if (figures_of_merit[i] < best_subtype) {
/*
* Yes. Choose it until we find a better one.
*/
wth->file_type_subtype = subtypes[i];
best_subtype = figures_of_merit[i];
}
}
done:
/*
* We treat a DLT_ value of 13 specially - it appears that in
* Nokia libpcap format, it's some form of ATM with what I
* suspect is a pseudo-header (even though Nokia's IPSO is
* based on FreeBSD, which #defines DLT_SLIP_BSDOS as 13).
*
* If this is a Nokia capture, treat 13 as WTAP_ENCAP_ATM_PDUS,
* rather than as what we normally treat it.
*/
if (wth->file_type_subtype == WTAP_FILE_TYPE_SUBTYPE_PCAP_NOKIA &&
hdr.network == 13)
wth->file_encap = WTAP_ENCAP_ATM_PDUS;
if (wth->file_encap == WTAP_ENCAP_ERF) {
/*
* Populate set of interface IDs for ERF format.
* Currently, this *has* to be done at open time.
*/
erf_populate_interfaces(wth);
}
return WTAP_OPEN_MINE;
}
/*
* Read a record trailer.
* On success, returns the packet encapsulation type.
* On error, returns -1 (which is WTAP_ENCAP_PER_PACKET, but we'd
* never return that on success).
* For metadata packets, returns 0 (which is WTAP_ENCAP_UNKNOWN, but
* we'd never return that on success).
*/
static int
netmon_read_rec_trailer(FILE_T fh, int trlr_size, int *err, gchar **err_info)
{
int bytes_read;
union {
struct netmonrec_2_1_trlr trlr_2_1;
struct netmonrec_2_2_trlr trlr_2_2;
struct netmonrec_2_3_trlr trlr_2_3;
} trlr;
guint16 network;
int pkt_encap;
errno = WTAP_ERR_CANT_READ;
bytes_read = file_read(&trlr, trlr_size, fh);
if (bytes_read != trlr_size) {
*err = file_error(fh, err_info);
if (*err == 0 && bytes_read != 0) {
*err = WTAP_ERR_SHORT_READ;
}
return -1; /* error */
}
network = pletohs(trlr.trlr_2_1.network);
if ((network & 0xF000) == NETMON_NET_PCAP_BASE) {
/*
* Converted pcap file - the LINKTYPE_ value
* is the network value with 0xF000 masked off.
*/
network &= 0x0FFF;
pkt_encap = wtap_pcap_encap_to_wtap_encap(network);
if (pkt_encap == WTAP_ENCAP_UNKNOWN) {
*err = WTAP_ERR_UNSUPPORTED_ENCAP;
*err_info = g_strdup_printf("netmon: converted pcap network type %u unknown or unsupported",
network);
return -1; /* error */
}
} else if (network < NUM_NETMON_ENCAPS) {
/*
* Regular NetMon encapsulation.
*/
pkt_encap = netmon_encap[network];
if (pkt_encap == WTAP_ENCAP_UNKNOWN) {
*err = WTAP_ERR_UNSUPPORTED_ENCAP;
*err_info = g_strdup_printf("netmon: network type %u unknown or unsupported",
network);
return -1; /* error */
}
} else {
/*
* Special packet type for metadata.
*/
switch (network) {
case NETMON_NET_NETEVENT:
case NETMON_NET_NETWORK_INFO_EX:
case NETMON_NET_PAYLOAD_HEADER:
case NETMON_NET_NETWORK_INFO:
case NETMON_NET_DNS_CACHE:
case NETMON_NET_NETMON_FILTER:
/*
* Just ignore those record types, for
* now. Tell our caller to read the next
* record.
*/
return 0;
default:
*err = WTAP_ERR_UNSUPPORTED_ENCAP;
*err_info = g_strdup_printf("netmon: network type %u unknown or unsupported",
network);
return -1; /* error */
}
}
return pkt_encap; /* success */
}
static void
dissect_pktap(tvbuff_t *tvb, packet_info *pinfo, proto_tree *tree)
{
proto_tree *pktap_tree = NULL;
proto_item *ti = NULL;
tvbuff_t *next_tvb;
int offset = 0;
guint32 pkt_len, rectype, dlt;
col_set_str(pinfo->cinfo, COL_PROTOCOL, "PKTAP");
col_clear(pinfo->cinfo, COL_INFO);
pkt_len = tvb_get_letohl(tvb, offset);
col_add_fstr(pinfo->cinfo, COL_INFO, "PKTAP, %u byte header", pkt_len);
/* Dissect the packet */
ti = proto_tree_add_item(tree, proto_pktap, tvb, offset, pkt_len, ENC_NA);
pktap_tree = proto_item_add_subtree(ti, ett_pktap);
proto_tree_add_item(pktap_tree, hf_pktap_hdrlen, tvb, offset, 4,
ENC_LITTLE_ENDIAN);
if (pkt_len < MIN_PKTAP_HDR_LEN) {
proto_tree_add_expert(tree, pinfo, &ei_pktap_hdrlen_too_short,
tvb, offset, 4);
return;
}
offset += 4;
proto_tree_add_item(pktap_tree, hf_pktap_rectype, tvb, offset, 4,
ENC_LITTLE_ENDIAN);
rectype = tvb_get_letohl(tvb, offset);
offset += 4;
proto_tree_add_item(pktap_tree, hf_pktap_dlt, tvb, offset, 4,
ENC_LITTLE_ENDIAN);
dlt = tvb_get_letohl(tvb, offset);
offset += 4;
proto_tree_add_item(pktap_tree, hf_pktap_ifname, tvb, offset, 24,
ENC_ASCII|ENC_NA);
offset += 24;
proto_tree_add_item(pktap_tree, hf_pktap_flags, tvb, offset, 4,
ENC_LITTLE_ENDIAN);
offset += 4;
proto_tree_add_item(pktap_tree, hf_pktap_pfamily, tvb, offset, 4,
ENC_LITTLE_ENDIAN);
offset += 4;
proto_tree_add_item(pktap_tree, hf_pktap_llhdrlen, tvb, offset, 4,
ENC_LITTLE_ENDIAN);
offset += 4;
proto_tree_add_item(pktap_tree, hf_pktap_lltrlrlen, tvb, offset, 4,
ENC_LITTLE_ENDIAN);
offset += 4;
proto_tree_add_item(pktap_tree, hf_pktap_pid, tvb, offset, 4,
ENC_LITTLE_ENDIAN);
offset += 4;
proto_tree_add_item(pktap_tree, hf_pktap_cmdname, tvb, offset, 20,
ENC_UTF_8|ENC_NA);
offset += 20;
proto_tree_add_item(pktap_tree, hf_pktap_svc_class, tvb, offset, 4,
ENC_LITTLE_ENDIAN);
offset += 4;
proto_tree_add_item(pktap_tree, hf_pktap_iftype, tvb, offset, 2,
ENC_LITTLE_ENDIAN);
offset += 2;
proto_tree_add_item(pktap_tree, hf_pktap_ifunit, tvb, offset, 2,
ENC_LITTLE_ENDIAN);
offset += 2;
proto_tree_add_item(pktap_tree, hf_pktap_epid, tvb, offset, 4,
ENC_LITTLE_ENDIAN);
offset += 4;
proto_tree_add_item(pktap_tree, hf_pktap_ecmdname, tvb, offset, 20,
ENC_UTF_8|ENC_NA);
offset += 20;
if (rectype == PKT_REC_PACKET) {
next_tvb = tvb_new_subset_remaining(tvb, pkt_len);
dissector_try_uint(wtap_encap_dissector_table,
wtap_pcap_encap_to_wtap_encap(dlt), next_tvb, pinfo, tree);
}
}
int libpcap_open(wtap *wth, int *err, gchar **err_info)
{
int bytes_read;
guint32 magic;
struct pcap_hdr hdr;
gboolean byte_swapped;
gboolean modified;
gboolean aix;
int file_encap;
libpcap_t *libpcap;
/* Read in the number that should be at the start of a "libpcap" file */
errno = WTAP_ERR_CANT_READ;
bytes_read = file_read(&magic, sizeof magic, wth->fh);
if (bytes_read != sizeof magic) {
*err = file_error(wth->fh, err_info);
if (*err != 0)
return -1;
return 0;
}
wth->data_offset += sizeof magic;
switch (magic) {
case PCAP_MAGIC:
/* Host that wrote it has our byte order, and was running
a program using either standard or ss990417 libpcap. */
byte_swapped = FALSE;
modified = FALSE;
wth->tsprecision = WTAP_FILE_TSPREC_USEC;
break;
case PCAP_MODIFIED_MAGIC:
/* Host that wrote it has our byte order, and was running
a program using either ss990915 or ss991029 libpcap. */
byte_swapped = FALSE;
modified = TRUE;
wth->tsprecision = WTAP_FILE_TSPREC_USEC;
break;
case PCAP_SWAPPED_MAGIC:
/* Host that wrote it has a byte order opposite to ours,
and was running a program using either standard or
ss990417 libpcap. */
byte_swapped = TRUE;
modified = FALSE;
wth->tsprecision = WTAP_FILE_TSPREC_USEC;
break;
case PCAP_SWAPPED_MODIFIED_MAGIC:
/* Host that wrote it out has a byte order opposite to
ours, and was running a program using either ss990915
or ss991029 libpcap. */
byte_swapped = TRUE;
modified = TRUE;
wth->tsprecision = WTAP_FILE_TSPREC_USEC;
break;
case PCAP_NSEC_MAGIC:
/* Host that wrote it has our byte order, and was writing
the file in a format similar to standard libpcap
except that the time stamps have nanosecond resolution. */
byte_swapped = FALSE;
modified = FALSE;
wth->tsprecision = WTAP_FILE_TSPREC_NSEC;
break;
case PCAP_SWAPPED_NSEC_MAGIC:
/* Host that wrote it out has a byte order opposite to
ours, and was writing the file in a format similar to
standard libpcap except that the time stamps have
nanosecond resolution. */
byte_swapped = TRUE;
modified = FALSE;
wth->tsprecision = WTAP_FILE_TSPREC_NSEC;
break;
default:
/* Not a "libpcap" type we know about. */
return 0;
}
/* Read the rest of the header. */
errno = WTAP_ERR_CANT_READ;
bytes_read = file_read(&hdr, sizeof hdr, wth->fh);
if (bytes_read != sizeof hdr) {
*err = file_error(wth->fh, err_info);
if (*err != 0)
return -1;
return 0;
}
wth->data_offset += sizeof hdr;
if (byte_swapped) {
/* Byte-swap the header fields about which we care. */
hdr.version_major = BSWAP16(hdr.version_major);
hdr.version_minor = BSWAP16(hdr.version_minor);
hdr.snaplen = BSWAP32(hdr.snaplen);
hdr.network = BSWAP32(hdr.network);
}
if (hdr.version_major < 2) {
/* We only support version 2.0 and later. */
*err = WTAP_ERR_UNSUPPORTED;
*err_info = g_strdup_printf("pcap: major version %u unsupported",
hdr.version_major);
return -1;
}
/*
* AIX's non-standard tcpdump uses a minor version number of 2.
* Unfortunately, older versions of libpcap might have used
* that as well.
*
* The AIX libpcap uses RFC 1573 ifType values rather than
* DLT_ values in the header; the ifType values for LAN devices
* are:
*
* Ethernet 6
* Token Ring 9
* FDDI 15
*
* which correspond to DLT_IEEE802 (used for Token Ring),
* DLT_PPP, and DLT_SLIP_BSDOS, respectively. The ifType value
* for a loopback interface is 24, which currently isn't
* used by any version of libpcap I know about (and, as
* tcpdump.org are assigning DLT_ values above 100, and
* NetBSD started assigning values starting at 50, and
* the values chosen by other libpcaps appear to stop at
* 19, it's probably not going to be used by any libpcap
* in the future).
*
* We shall assume that if the minor version number is 2, and
* the network type is 6, 9, 15, or 24, that it's AIX libpcap.
*
* I'm assuming those older versions of libpcap didn't
* use DLT_IEEE802 for Token Ring, and didn't use DLT_SLIP_BSDOS
* as that came later. It may have used DLT_PPP, however, in
* which case we're out of luck; we assume it's Token Ring
* in AIX libpcap rather than PPP in standard libpcap, as
* you're probably more likely to be handing an AIX libpcap
* token-ring capture than an old (pre-libpcap 0.4) PPP capture
* to Wireshark.
*/
aix = FALSE; /* assume it's not AIX */
if (hdr.version_major == 2 && hdr.version_minor == 2) {
switch (hdr.network) {
case 6:
hdr.network = 1; /* DLT_EN10MB, Ethernet */
aix = TRUE;
break;
case 9:
hdr.network = 6; /* DLT_IEEE802, Token Ring */
aix = TRUE;
break;
case 15:
hdr.network = 10; /* DLT_FDDI, FDDI */
aix = TRUE;
break;
case 24:
hdr.network = 0; /* DLT_NULL, loopback */
aix = TRUE;
break;
}
}
file_encap = wtap_pcap_encap_to_wtap_encap(hdr.network);
if (file_encap == WTAP_ENCAP_UNKNOWN) {
*err = WTAP_ERR_UNSUPPORTED_ENCAP;
*err_info = g_strdup_printf("pcap: network type %u unknown or unsupported",
hdr.network);
return -1;
}
/* This is a libpcap file */
libpcap = (libpcap_t *)g_malloc(sizeof(libpcap_t));;
libpcap->byte_swapped = byte_swapped;
libpcap->version_major = hdr.version_major;
libpcap->version_minor = hdr.version_minor;
wth->priv = (void *)libpcap;
wth->subtype_read = libpcap_read;
wth->subtype_seek_read = libpcap_seek_read;
wth->file_encap = file_encap;
wth->snapshot_length = hdr.snaplen;
/* In file format version 2.3, the order of the "incl_len" and
"orig_len" fields in the per-packet header was reversed,
in order to match the BPF header layout.
Therefore, in files with versions prior to that, we must swap
those two fields.
Unfortunately, some files were, according to a comment in the
"libpcap" source, written with version 2.3 in their headers
but without the interchanged fields, so if "incl_len" is
greater than "orig_len" - which would make no sense - we
assume that we need to swap them in version 2.3 files
as well.
In addition, DG/UX's tcpdump uses version 543.0, and writes
the two fields in the pre-2.3 order. */
switch (hdr.version_major) {
case 2:
if (hdr.version_minor < 3)
libpcap->lengths_swapped = SWAPPED;
else if (hdr.version_minor == 3)
libpcap->lengths_swapped = MAYBE_SWAPPED;
else
libpcap->lengths_swapped = NOT_SWAPPED;
break;
case 543:
libpcap->lengths_swapped = SWAPPED;
break;
default:
libpcap->lengths_swapped = NOT_SWAPPED;
break;
}
/*
* Is this AIX format?
*/
if (aix) {
/*
* Yes. Skip all the tests for other mutant formats,
* and set the precision to nanosecond precision.
*/
wth->file_type = WTAP_FILE_PCAP_AIX;
wth->tsprecision = WTAP_FILE_TSPREC_NSEC;
return 1;
}
/*
* No. Let's look at the header for the first record,
* and see if, interpreting it as a standard header (if the
* magic number was standard) or a modified header (if the
* magic number was modified), the position where it says the
* header for the *second* record is contains a corrupted header.
*
* If so, then:
*
* If this file had the standard magic number, it may be
* an ss990417 capture file - in that version of Alexey's
* patch, the packet header format was changed but the
* magic number wasn't, and, alas, Red Hat appear to have
* picked up that version of the patch for RH 6.1, meaning
* RH 6.1 has a tcpdump that writes out files that can't
* be read by any software that expects non-modified headers
* if the magic number isn't the modified magic number (e.g.,
* any normal version of tcpdump, and Wireshark if we don't
* do this gross heuristic).
*
* If this file had the modified magic number, it may be
* an ss990915 capture file - in that version of Alexey's
* patch, the magic number was changed, but the record
* header had some extra fields, and, alas, SuSE appear
* to have picked up that version of the patch for SuSE
* 6.3, meaning that programs expecting the standard per-
* packet header in captures with the modified magic number
* can't read dumps from its tcpdump.
*
* Oh, and if it has the standard magic number, it might, instead,
* be a Nokia libpcap file, so we may need to try that if
* neither normal nor ss990417 headers work.
*/
if (modified) {
/*
* Well, we have the magic number from Alexey's
* later two patches.
*
* Try ss991029, the last of his patches, first.
*/
wth->file_type = WTAP_FILE_PCAP_SS991029;
switch (libpcap_try(wth, err)) {
case BAD_READ:
/*
* Well, we couldn't even read it.
* Give up.
*/
g_free(wth->priv);
return -1;
case THIS_FORMAT:
/*
* Well, it looks as if it might be 991029.
* Put the seek pointer back, and return success.
*/
if (file_seek(wth->fh, wth->data_offset, SEEK_SET, err) == -1) {
g_free(wth->priv);
return -1;
}
return 1;
case OTHER_FORMAT:
/*
* Try the next format.
*/
break;
}
/*
* Well, it's not completely unreadable,
* but it's not ss991029. Try ss990915;
* there are no other types to try after that,
* so we put the seek pointer back and treat
* it as 990915.
*/
wth->file_type = WTAP_FILE_PCAP_SS990915;
if (file_seek(wth->fh, wth->data_offset, SEEK_SET, err) == -1) {
g_free(wth->priv);
return -1;
}
} else {
/*
* Well, we have the standard magic number.
*
* Try the standard format first.
*/
if(wth->tsprecision == WTAP_FILE_TSPREC_NSEC) {
wth->file_type = WTAP_FILE_PCAP_NSEC;
} else {
wth->file_type = WTAP_FILE_PCAP;
}
switch (libpcap_try(wth, err)) {
case BAD_READ:
/*
* Well, we couldn't even read it.
* Give up.
*/
g_free(wth->priv);
return -1;
case THIS_FORMAT:
/*
* Well, it looks as if it might be a standard
* libpcap file.
* Put the seek pointer back, and return success.
*/
if (file_seek(wth->fh, wth->data_offset, SEEK_SET, err) == -1) {
g_free(wth->priv);
return -1;
}
return 1;
case OTHER_FORMAT:
/*
* Try the next format.
*/
break;
}
/*
* Well, it's not completely unreadable, but it's not
* a standard file. Put the seek pointer back and try
* ss990417.
*/
wth->file_type = WTAP_FILE_PCAP_SS990417;
if (file_seek(wth->fh, wth->data_offset, SEEK_SET, err) == -1) {
g_free(wth->priv);
return -1;
}
switch (libpcap_try(wth, err)) {
case BAD_READ:
/*
* Well, we couldn't even read it.
* Give up.
*/
g_free(wth->priv);
return -1;
case THIS_FORMAT:
/*
* Well, it looks as if it might be ss990417.
* Put the seek pointer back, and return success.
*/
if (file_seek(wth->fh, wth->data_offset, SEEK_SET, err) == -1) {
g_free(wth->priv);
return -1;
}
return 1;
case OTHER_FORMAT:
/*
* Try the next format.
*/
break;
}
/*
* Well, it's not completely unreadable,
* but it's not a standard file *nor* is it ss990417.
* Try it as a Nokia file; there are no other types
* to try after that, so we put the seek pointer back
* and treat it as a Nokia file.
*/
wth->file_type = WTAP_FILE_PCAP_NOKIA;
if (file_seek(wth->fh, wth->data_offset, SEEK_SET, err) == -1) {
g_free(wth->priv);
return -1;
}
}
/*
* We treat a DLT_ value of 13 specially - it appears that in
* Nokia libpcap format, it's some form of ATM with what I
* suspect is a pseudo-header (even though Nokia's IPSO is
* based on FreeBSD, which #defines DLT_SLIP_BSDOS as 13).
*
* If this is a Nokia capture, treat 13 as WTAP_ENCAP_ATM_PDUS,
* rather than as what we normally treat it.
*/
if (wth->file_type == WTAP_FILE_PCAP_NOKIA && hdr.network == 13)
wth->file_encap = WTAP_ENCAP_ATM_PDUS;
return 1;
}
static int
dissect_pcap_pktdata(tvbuff_t *tvb, packet_info *pinfo, proto_tree *tree, void *data)
{
gint offset = 0;
guint32 *link_type;
guint32 length = 0;
tvbuff_t *next_tvb;
proto_item *pseudoheader_item;
proto_tree *pseudoheader_tree = NULL;
proto_item *packet_item;
proto_tree *packet_tree;
DISSECTOR_ASSERT(data);
link_type = (guint32 *) data;
pinfo->phdr->pkt_encap = wtap_pcap_encap_to_wtap_encap(*link_type);
switch (*link_type) {
case 139:
/* TODO no description for pseudoheader at http://www.tcpdump.org/linktypes.html */
break;
case 196:
length = 5;
break;
case 197:
/* TODO no description for pseudoheader at http://www.tcpdump.org/linktypes.html */
break;
case 201:
length = 4;
break;
case 204:
length = 1;
break;
case 205:
length = 1;
break;
case 206:
length = 1;
break;
case 209:
length = 6;
break;
case 226:
length = 24;
break;
case 227:
/* TODO no description for pseudoheader at http://www.tcpdump.org/linktypes.html */
break;
case 240:
case 241:
length = 4;
break;
case 244:
length = 20;
break;
case 245:
length = 20;
break;
}
if (length > 0) {
pseudoheader_item = proto_tree_add_item(tree, hf_pcap_pktdata_pseudoheader, tvb, offset, length, ENC_NA);
pseudoheader_tree = proto_item_add_subtree(pseudoheader_item, ett_pcap_pktdata_pseudoheader);
}
switch (*link_type) {
case 201:
proto_tree_add_item(pseudoheader_tree, hf_pcap_pktdata_pseudoheader_bluetooth_direction, tvb, offset, 4, ENC_BIG_ENDIAN);
if (tvb_get_guint32(tvb, offset, ENC_BIG_ENDIAN) == 0)
pinfo->p2p_dir = P2P_DIR_SENT;
else if (tvb_get_guint32(tvb, offset, ENC_BIG_ENDIAN) == 1)
pinfo->p2p_dir = P2P_DIR_RECV;
else
pinfo->p2p_dir = P2P_DIR_UNKNOWN;
offset += 4;
break;
default:
offset += length;
}
next_tvb = tvb_new_subset_remaining(tvb, offset);
packet_item = proto_tree_add_item(tree, hf_pcap_pktdata_data, tvb, offset, tvb_reported_length(next_tvb), ENC_NA);
packet_tree = proto_item_add_subtree(packet_item, ett_pcap_pktdata_data);
offset = dissector_try_uint_new(wtap_encap_table, pinfo->phdr->pkt_encap, next_tvb, pinfo, packet_tree, TRUE, NULL);
return offset;
}
/* Read the next packet */
static gboolean netmon_read(wtap *wth, int *err, gchar **err_info,
gint64 *data_offset)
{
netmon_t *netmon = (netmon_t *)wth->priv;
guint32 packet_size = 0;
guint32 orig_size = 0;
int bytes_read;
union {
struct netmonrec_1_x_hdr hdr_1_x;
struct netmonrec_2_x_hdr hdr_2_x;
} hdr;
union {
struct netmonrec_2_1_trlr trlr_2_1;
struct netmonrec_2_2_trlr trlr_2_2;
struct netmonrec_2_3_trlr trlr_2_3;
} trlr;
int hdr_size = 0;
int trlr_size = 0;
int rec_offset;
guint8 *data_ptr;
gint64 delta = 0; /* signed - frame times can be before the nominal start */
time_t secs;
guint32 usecs;
double t;
guint16 network;
again:
/* Have we reached the end of the packet data? */
if (netmon->current_frame >= netmon->frame_table_size) {
/* Yes. We won't need the frame table any more;
free it. */
g_free(netmon->frame_table);
netmon->frame_table = NULL;
*err = 0; /* it's just an EOF, not an error */
return FALSE;
}
/* Seek to the beginning of the current record, if we're
not there already (seeking to the current position
may still cause a seek and a read of the underlying file,
so we don't want to do it unconditionally).
Yes, the current record could be before the previous
record. At least some captures put the trailer record
with statistics as the first physical record in the
file, but set the frame table up so it's the last
record in sequence. */
rec_offset = netmon->frame_table[netmon->current_frame];
if (wth->data_offset != rec_offset) {
wth->data_offset = rec_offset;
if (file_seek(wth->fh, wth->data_offset, SEEK_SET, err) == -1)
return FALSE;
}
netmon->current_frame++;
/* Read record header. */
switch (netmon->version_major) {
case 1:
hdr_size = sizeof (struct netmonrec_1_x_hdr);
break;
case 2:
hdr_size = sizeof (struct netmonrec_2_x_hdr);
break;
}
errno = WTAP_ERR_CANT_READ;
bytes_read = file_read(&hdr, hdr_size, wth->fh);
if (bytes_read != hdr_size) {
*err = file_error(wth->fh);
if (*err == 0 && bytes_read != 0) {
*err = WTAP_ERR_SHORT_READ;
}
return FALSE;
}
wth->data_offset += hdr_size;
switch (netmon->version_major) {
case 1:
orig_size = pletohs(&hdr.hdr_1_x.orig_len);
packet_size = pletohs(&hdr.hdr_1_x.incl_len);
break;
case 2:
orig_size = pletohl(&hdr.hdr_2_x.orig_len);
packet_size = pletohl(&hdr.hdr_2_x.incl_len);
break;
}
if (packet_size > WTAP_MAX_PACKET_SIZE) {
/*
* Probably a corrupt capture file; don't blow up trying
* to allocate space for an immensely-large packet.
*/
*err = WTAP_ERR_BAD_RECORD;
*err_info = g_strdup_printf("netmon: File has %u-byte packet, bigger than maximum of %u",
packet_size, WTAP_MAX_PACKET_SIZE);
return FALSE;
}
*data_offset = wth->data_offset;
/*
* If this is an ATM packet, the first
* "sizeof (struct netmon_atm_hdr)" bytes have destination and
* source addresses (6 bytes - MAC addresses of some sort?)
* and the VPI and VCI; read them and generate the pseudo-header
* from them.
*/
switch (wth->file_encap) {
case WTAP_ENCAP_ATM_PDUS:
if (packet_size < sizeof (struct netmon_atm_hdr)) {
/*
* Uh-oh, the packet isn't big enough to even
* have a pseudo-header.
*/
*err = WTAP_ERR_BAD_RECORD;
*err_info = g_strdup_printf("netmon: ATM file has a %u-byte packet, too small to have even an ATM pseudo-header",
packet_size);
return FALSE;
}
if (!netmon_read_atm_pseudoheader(wth->fh, &wth->pseudo_header,
err))
return FALSE; /* Read error */
/*
* Don't count the pseudo-header as part of the packet.
*/
orig_size -= (guint)sizeof (struct netmon_atm_hdr);
packet_size -= (guint)sizeof (struct netmon_atm_hdr);
wth->data_offset += sizeof (struct netmon_atm_hdr);
break;
case WTAP_ENCAP_ETHERNET:
/*
* We assume there's no FCS in this frame.
*/
wth->pseudo_header.eth.fcs_len = 0;
break;
}
buffer_assure_space(wth->frame_buffer, packet_size);
data_ptr = buffer_start_ptr(wth->frame_buffer);
if (!netmon_read_rec_data(wth->fh, data_ptr, packet_size, err))
return FALSE; /* Read error */
wth->data_offset += packet_size;
t = (double)netmon->start_usecs;
switch (netmon->version_major) {
case 1:
/*
* According to Paul Long, this offset is unsigned.
* It's 32 bits, so the maximum value will fit in
* a gint64 such as delta, even after multiplying
* it by 1000.
*
* pletohl() returns a guint32; we cast it to gint64
* before multiplying, so that the product doesn't
* overflow a guint32.
*/
delta = ((gint64)pletohl(&hdr.hdr_1_x.ts_delta))*1000;
break;
case 2:
delta = pletohl(&hdr.hdr_2_x.ts_delta_lo)
| (((guint64)pletohl(&hdr.hdr_2_x.ts_delta_hi)) << 32);
break;
}
t += (double)delta;
secs = (time_t)(t/1000000);
usecs = (guint32)(t - (double)secs*1000000);
wth->phdr.ts.secs = netmon->start_secs + secs;
wth->phdr.ts.nsecs = usecs * 1000;
wth->phdr.caplen = packet_size;
wth->phdr.len = orig_size;
/*
* Attempt to guess from the packet data, the VPI, and the VCI
* information about the type of traffic.
*/
if (wth->file_encap == WTAP_ENCAP_ATM_PDUS) {
atm_guess_traffic_type(data_ptr, packet_size,
&wth->pseudo_header);
}
/*
* For version 2.1 and later, there's additional information
* after the frame data.
*/
if ((netmon->version_major == 2 && netmon->version_minor >= 1) ||
netmon->version_major > 2) {
if (netmon->version_major > 2) {
/*
* Asssume 2.3 format, for now.
*/
trlr_size = sizeof (struct netmonrec_2_3_trlr);
} else {
switch (netmon->version_minor) {
case 1:
trlr_size = sizeof (struct netmonrec_2_1_trlr);
break;
case 2:
trlr_size = sizeof (struct netmonrec_2_2_trlr);
break;
default:
trlr_size = sizeof (struct netmonrec_2_3_trlr);
break;
}
}
errno = WTAP_ERR_CANT_READ;
bytes_read = file_read(&trlr, trlr_size, wth->fh);
if (bytes_read != trlr_size) {
*err = file_error(wth->fh);
if (*err == 0 && bytes_read != 0) {
*err = WTAP_ERR_SHORT_READ;
}
return FALSE;
}
wth->data_offset += trlr_size;
network = pletohs(trlr.trlr_2_1.network);
if ((network & 0xF000) == NETMON_NET_PCAP_BASE) {
/*
* Converted pcap file - the LINKTYPE_ value
* is the network value with 0xF000 masked off.
*/
network &= 0x0FFF;
wth->phdr.pkt_encap =
wtap_pcap_encap_to_wtap_encap(network);
if (wth->phdr.pkt_encap == WTAP_ENCAP_UNKNOWN) {
*err = WTAP_ERR_UNSUPPORTED_ENCAP;
*err_info = g_strdup_printf("netmon: converted pcap network type %u unknown or unsupported",
network);
return FALSE;
}
} else if (network < NUM_NETMON_ENCAPS) {
/*
* Regular NetMon encapsulation.
*/
wth->phdr.pkt_encap = netmon_encap[network];
if (wth->phdr.pkt_encap == WTAP_ENCAP_UNKNOWN) {
*err = WTAP_ERR_UNSUPPORTED_ENCAP;
*err_info = g_strdup_printf("netmon: network type %u unknown or unsupported",
network);
return FALSE;
}
} else {
/*
* Special packet type for metadata.
*/
switch (network) {
case NETMON_NET_NETEVENT:
case NETMON_NET_NETWORK_INFO_EX:
case NETMON_NET_PAYLOAD_HEADER:
case NETMON_NET_NETWORK_INFO:
case NETMON_NET_DNS_CACHE:
case NETMON_NET_NETMON_FILTER:
/*
* Just ignore those record types, for
* now. Read the next record.
*/
goto again;
default:
*err = WTAP_ERR_UNSUPPORTED_ENCAP;
*err_info = g_strdup_printf("netmon: network type %u unknown or unsupported",
network);
return FALSE;
}
}
}
return TRUE;
}
static process_record_retval
netmon_process_record(wtap *wth, FILE_T fh, struct wtap_pkthdr *phdr,
Buffer *buf, int *err, gchar **err_info)
{
netmon_t *netmon = (netmon_t *)wth->priv;
int hdr_size = 0;
union {
struct netmonrec_1_x_hdr hdr_1_x;
struct netmonrec_2_x_hdr hdr_2_x;
} hdr;
int bytes_read;
gint64 delta = 0; /* signed - frame times can be before the nominal start */
gint64 t;
time_t secs;
int nsecs;
guint32 packet_size = 0;
guint32 orig_size = 0;
int trlr_size;
union {
struct netmonrec_2_1_trlr trlr_2_1;
struct netmonrec_2_2_trlr trlr_2_2;
struct netmonrec_2_3_trlr trlr_2_3;
} trlr;
guint16 network;
int pkt_encap;
/* Read record header. */
switch (netmon->version_major) {
case 1:
hdr_size = sizeof (struct netmonrec_1_x_hdr);
break;
case 2:
hdr_size = sizeof (struct netmonrec_2_x_hdr);
break;
}
errno = WTAP_ERR_CANT_READ;
bytes_read = file_read(&hdr, hdr_size, fh);
if (bytes_read != hdr_size) {
*err = file_error(fh, err_info);
if (*err == 0 && bytes_read != 0) {
*err = WTAP_ERR_SHORT_READ;
}
return FAILURE;
}
switch (netmon->version_major) {
case 1:
orig_size = pletoh16(&hdr.hdr_1_x.orig_len);
packet_size = pletoh16(&hdr.hdr_1_x.incl_len);
break;
case 2:
orig_size = pletoh32(&hdr.hdr_2_x.orig_len);
packet_size = pletoh32(&hdr.hdr_2_x.incl_len);
break;
}
if (packet_size > WTAP_MAX_PACKET_SIZE) {
/*
* Probably a corrupt capture file; don't blow up trying
* to allocate space for an immensely-large packet.
*/
*err = WTAP_ERR_BAD_FILE;
*err_info = g_strdup_printf("netmon: File has %u-byte packet, bigger than maximum of %u",
packet_size, WTAP_MAX_PACKET_SIZE);
return FAILURE;
}
phdr->rec_type = REC_TYPE_PACKET;
/*
* If this is an ATM packet, the first
* "sizeof (struct netmon_atm_hdr)" bytes have destination and
* source addresses (6 bytes - MAC addresses of some sort?)
* and the VPI and VCI; read them and generate the pseudo-header
* from them.
*/
switch (wth->file_encap) {
case WTAP_ENCAP_ATM_PDUS:
if (packet_size < sizeof (struct netmon_atm_hdr)) {
/*
* Uh-oh, the packet isn't big enough to even
* have a pseudo-header.
*/
*err = WTAP_ERR_BAD_FILE;
*err_info = g_strdup_printf("netmon: ATM file has a %u-byte packet, too small to have even an ATM pseudo-header",
packet_size);
return FAILURE;
}
if (!netmon_read_atm_pseudoheader(fh, &phdr->pseudo_header,
err, err_info))
return FAILURE; /* Read error */
/*
* Don't count the pseudo-header as part of the packet.
*/
orig_size -= (guint)sizeof (struct netmon_atm_hdr);
packet_size -= (guint)sizeof (struct netmon_atm_hdr);
break;
default:
break;
}
switch (netmon->version_major) {
case 1:
/*
* According to Paul Long, this offset is unsigned.
* It's 32 bits, so the maximum value will fit in
* a gint64 such as delta, even after multiplying
* it by 1000000.
*
* pletoh32() returns a guint32; we cast it to gint64
* before multiplying, so that the product doesn't
* overflow a guint32.
*/
delta = ((gint64)pletoh32(&hdr.hdr_1_x.ts_delta))*1000000;
break;
case 2:
/*
* OK, this is weird. Microsoft's documentation
* says this is in microseconds and is a 64-bit
* unsigned number, but it can be negative; they
* say what appears to amount to "treat it as an
* unsigned number, multiply it by 10, and then
* interpret the resulting 64-bit quantity as a
* signed number". That operation can turn a
* value with the uppermost bit 0 to a value with
* the uppermost bit 1, hence turning a large
* positive number-of-microseconds into a small
* negative number-of-100-nanosecond-increments.
*/
delta = pletoh64(&hdr.hdr_2_x.ts_delta)*10;
/*
* OK, it's now a signed value in 100-nanosecond
* units. Now convert it to nanosecond units.
*/
delta *= 100;
break;
}
secs = 0;
t = netmon->start_nsecs + delta;
while (t < 0) {
/*
* Propagate a borrow into the seconds.
* The seconds is a time_t, and can be < 0
* (unlikely, as Windows didn't exist before
* January 1, 1970, 00:00:00 UTC), while the
* nanoseconds should be positive, as in
* "nanoseconds since the instant of time
* represented by the seconds".
*
* We do not want t to be negative, as, according
* to the C90 standard, "if either operand [of /
* or %] is negative, whether the result of the
* / operator is the largest integer less than or
* equal to the algebraic quotient or the smallest
* greater than or equal to the algebraic quotient
* is implementation-defined, as is the sign of
* the result of the % operator", and we want
* the result of the division and remainder
* operations to be the same on all platforms.
*/
t += 1000000000;
secs--;
}
secs += (time_t)(t/1000000000);
nsecs = (int)(t%1000000000);
phdr->presence_flags = WTAP_HAS_TS|WTAP_HAS_CAP_LEN;
phdr->ts.secs = netmon->start_secs + secs;
phdr->ts.nsecs = nsecs;
phdr->caplen = packet_size;
phdr->len = orig_size;
/*
* Read the packet data.
*/
if (!wtap_read_packet_bytes(fh, buf, phdr->caplen, err, err_info))
return FAILURE;
/*
* For version 2.1 and later, there's additional information
* after the frame data.
*/
if ((netmon->version_major == 2 && netmon->version_minor >= 1) ||
netmon->version_major > 2) {
if (netmon->version_major > 2) {
/*
* Asssume 2.3 format, for now.
*/
trlr_size = (int)sizeof (struct netmonrec_2_3_trlr);
} else {
switch (netmon->version_minor) {
case 1:
trlr_size = (int)sizeof (struct netmonrec_2_1_trlr);
break;
case 2:
trlr_size = (int)sizeof (struct netmonrec_2_2_trlr);
break;
default:
trlr_size = (int)sizeof (struct netmonrec_2_3_trlr);
break;
}
}
errno = WTAP_ERR_CANT_READ;
bytes_read = file_read(&trlr, trlr_size, fh);
if (bytes_read != trlr_size) {
*err = file_error(fh, err_info);
if (*err == 0 && bytes_read != 0) {
*err = WTAP_ERR_SHORT_READ;
}
return FAILURE;
}
network = pletoh16(trlr.trlr_2_1.network);
if ((network & 0xF000) == NETMON_NET_PCAP_BASE) {
/*
* Converted pcap file - the LINKTYPE_ value
* is the network value with 0xF000 masked off.
*/
network &= 0x0FFF;
pkt_encap = wtap_pcap_encap_to_wtap_encap(network);
if (pkt_encap == WTAP_ENCAP_UNKNOWN) {
*err = WTAP_ERR_UNSUPPORTED;
*err_info = g_strdup_printf("netmon: converted pcap network type %u unknown or unsupported",
network);
return FAILURE;
}
} else if (network < NUM_NETMON_ENCAPS) {
/*
* Regular NetMon encapsulation.
*/
pkt_encap = netmon_encap[network];
if (pkt_encap == WTAP_ENCAP_UNKNOWN) {
*err = WTAP_ERR_UNSUPPORTED;
*err_info = g_strdup_printf("netmon: network type %u unknown or unsupported",
network);
return FAILURE;
}
} else {
/*
* Special packet type for metadata.
*/
switch (network) {
case NETMON_NET_NETEVENT:
/*
* Event Tracing event.
*
* http://msdn.microsoft.com/en-us/library/aa363759(VS.85).aspx
*/
return RETRY;
case NETMON_NET_NETWORK_INFO_EX:
/*
* List of adapters on which the capture
* was done.
*/
return RETRY;
case NETMON_NET_PAYLOAD_HEADER:
/*
* Header for a fake frame constructed
* by reassembly.
*/
return RETRY;
case NETMON_NET_NETWORK_INFO:
/*
* List of adapters on which the capture
* was done.
*/
return RETRY;
case NETMON_NET_DNS_CACHE:
/*
* List of resolved IP addresses.
*/
return RETRY;
case NETMON_NET_NETMON_FILTER:
/*
* NetMon capture or display filter
* string.
*/
return RETRY;
default:
*err = WTAP_ERR_UNSUPPORTED;
*err_info = g_strdup_printf("netmon: network type %u unknown or unsupported",
network);
return FAILURE;
}
}
phdr->pkt_encap = pkt_encap;
if (netmon->version_major > 2 || netmon->version_minor > 2) {
guint64 d;
d = pletoh64(trlr.trlr_2_3.utc_timestamp);
/*
* Get the time as seconds and nanoseconds.
* and overwrite the time stamp obtained
* from the record header.
*/
if (!filetime_to_nstime(&phdr->ts, d)) {
*err = WTAP_ERR_BAD_FILE;
*err_info = g_strdup_printf("netmon: time stamp outside supported range");
return FAILURE;
}
}
}
netmon_set_pseudo_header_info(phdr, buf);
return SUCCESS;
}
