static gboolean
netmon_seek_read(wtap *wth, gint64 seek_off,
struct wtap_pkthdr *phdr, guint8 *pd, int length,
int *err, gchar **err_info)
{
union wtap_pseudo_header *pseudo_header = &phdr->pseudo_header;
netmon_t *netmon = (netmon_t *)wth->priv;
int trlr_size;
int pkt_encap;
if (file_seek(wth->random_fh, seek_off, SEEK_SET, err) == -1)
return FALSE;
switch (wth->file_encap) {
case WTAP_ENCAP_ATM_PDUS:
if (!netmon_read_atm_pseudoheader(wth->random_fh, pseudo_header,
err, err_info)) {
/* Read error */
return FALSE;
}
break;
}
/*
* Read the packet data.
*/
if (!netmon_read_rec_data(wth->random_fh, pd, length, err, err_info))
return FALSE;
/*
* For version 2.1 and later, there's additional information
* after the frame data.
*/
trlr_size = (int)netmon_trailer_size(netmon);
if (trlr_size != 0) {
/*
* I haz a trailer.
*/
pkt_encap = netmon_read_rec_trailer(wth->random_fh,
trlr_size, err, err_info);
if (pkt_encap == -1)
return FALSE; /* error */
if (pkt_encap == 0) {
/*
* This should not happen.
*/
*err = WTAP_ERR_BAD_FILE;
*err_info = g_strdup("netmon: saw metadata in netmon_seek_read");
return FALSE;
}
netmon_set_pseudo_header_info(pkt_encap, pseudo_header,
pd, length);
} else {
netmon_set_pseudo_header_info(wth->file_encap, pseudo_header,
pd, length);
}
return TRUE;
}
static gboolean
netmon_seek_read(wtap *wth, gint64 seek_off,
struct wtap_pkthdr *phdr, Buffer *buf, int length,
int *err, gchar **err_info)
{
netmon_t *netmon = (netmon_t *)wth->priv;
if (file_seek(wth->random_fh, seek_off, SEEK_SET, err) == -1)
return FALSE;
if (!netmon_process_rec_header(wth, wth->random_fh, phdr,
err, err_info))
return FALSE;
/*
* Read the packet data.
*/
if (!wtap_read_packet_bytes(wth->random_fh, buf, length, err, err_info))
return FALSE;
/*
* For version 2.1 and later, there's additional information
* after the frame data.
*/
switch (netmon_process_rec_trailer(netmon, wth->random_fh, phdr,
err, err_info)) {
case RETRY:
/*
* This should not happen.
*/
*err = WTAP_ERR_BAD_FILE;
*err_info = g_strdup("netmon: saw metadata in netmon_seek_read");
return FALSE;
case SUCCESS:
break;
case FAILURE:
return FALSE;
}
netmon_set_pseudo_header_info(phdr->pkt_encap,
&phdr->pseudo_header, buf, phdr->caplen);
return TRUE;
}
/* 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;
int hdr_size = 0;
int trlr_size;
gint64 rec_offset;
guint8 *data_ptr;
gint64 delta = 0; /* signed - frame times can be before the nominal start */
gint64 t;
time_t secs;
guint32 nsecs;
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, err_info);
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_FILE;
*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_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 FALSE;
}
if (!netmon_read_atm_pseudoheader(wth->fh, &wth->pseudo_header,
err, err_info))
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;
default:
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,
err_info))
return FALSE; /* Read error */
wth->data_offset += packet_size;
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.
*
* 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))*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 = pletohll(&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 = (guint32)(t%1000000000);
wth->phdr.presence_flags = WTAP_HAS_TS|WTAP_HAS_CAP_LEN;
wth->phdr.ts.secs = netmon->start_secs + secs;
wth->phdr.ts.nsecs = nsecs;
wth->phdr.caplen = packet_size;
wth->phdr.len = orig_size;
/*
* For version 2.1 and later, there's additional information
* after the frame data.
*/
trlr_size = (int)netmon_trailer_size(netmon);
if (trlr_size != 0) {
/*
* I haz a trailer.
*/
wth->phdr.pkt_encap = netmon_read_rec_trailer(wth->fh,
trlr_size, err, err_info);
if (wth->phdr.pkt_encap == -1)
return FALSE; /* error */
wth->data_offset += trlr_size;
if (wth->phdr.pkt_encap == 0)
goto again;
netmon_set_pseudo_header_info(wth->phdr.pkt_encap,
&wth->pseudo_header, data_ptr, packet_size);
} else {
netmon_set_pseudo_header_info(wth->file_encap,
&wth->pseudo_header, data_ptr, packet_size);
}
return TRUE;
}
/* 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;
gint64 rec_offset;
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 (file_tell(wth->fh) != rec_offset) {
if (file_seek(wth->fh, rec_offset, SEEK_SET, err) == -1)
return FALSE;
}
netmon->current_frame++;
*data_offset = file_tell(wth->fh);
if (!netmon_process_rec_header(wth, wth->fh, &wth->phdr,
err, err_info))
return FALSE;
if (!wtap_read_packet_bytes(wth->fh, wth->frame_buffer,
wth->phdr.caplen, err, err_info))
return FALSE; /* Read error */
/*
* For version 2.1 and later, there's additional information
* after the frame data.
*/
switch (netmon_process_rec_trailer(netmon, wth->fh, &wth->phdr,
err, err_info)) {
case RETRY:
goto again;
case SUCCESS:
break;
case FAILURE:
return FALSE;
}
netmon_set_pseudo_header_info(wth->phdr.pkt_encap,
&wth->phdr.pseudo_header, wth->frame_buffer, wth->phdr.caplen);
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;
}