/* dbs-etherwatch.c
- *
- * $Id$
*
* Wiretap Library
* Copyright (c) 2001 by Marc Milgram <ethereal@mmilgram.NOSPAMmail.net>
#include "config.h"
#include "wtap-int.h"
-#include "buffer.h"
#include "dbs-etherwatch.h"
#include "file_wrappers.h"
-#include <stdio.h>
#include <stdlib.h>
#include <string.h>
-#include <ctype.h>
/* This module reads the text output of the 'DBS-ETHERTRACE' command in VMS
* It was initially based on vms.c.
static const char dbs_etherwatch_rec_magic[] =
{'F', 'r', 'o', 'm', ' '};
#define DBS_ETHERWATCH_REC_MAGIC_SIZE \
- (sizeof dbs_etherwatch_rec_magic / sizeof dbs_etherwatch_rec_magic[0])
+ (sizeof dbs_etherwatch_rec_magic / sizeof dbs_etherwatch_rec_magic[0])
/*
- * XXX - is this the biggest packet we can get?
+ * Default packet size - maximum normal Ethernet packet size, without an
+ * FCS.
*/
-#define DBS_ETHERWATCH_MAX_PACKET_LEN 16384
+#define DBS_ETHERWATCH_MAX_ETHERNET_PACKET_LEN 1514
static gboolean dbs_etherwatch_read(wtap *wth, int *err, gchar **err_info,
- gint64 *data_offset);
+ gint64 *data_offset);
static gboolean dbs_etherwatch_seek_read(wtap *wth, gint64 seek_off,
- struct wtap_pkthdr *phdr, guint8 *pd, int len,
- int *err, gchar **err_info);
-static int parse_dbs_etherwatch_packet(wtap *wth, FILE_T fh, guint8* buf,
- int *err, gchar **err_info);
+ struct wtap_pkthdr *phdr, Buffer *buf, int *err, gchar **err_info);
+static gboolean parse_dbs_etherwatch_packet(struct wtap_pkthdr *phdr, FILE_T fh,
+ Buffer* buf, int *err, gchar **err_info);
static guint parse_single_hex_dump_line(char* rec, guint8 *buf,
- int byte_offset);
+ int byte_offset);
static guint parse_hex_dump(char* dump, guint8 *buf, char seperator, char end);
/* Seeks to the beginning of the next packet, and returns the
byte offset. Returns -1 on failure, and sets "*err" to the error
and "*err_info" to null or an additional error string. */
static gint64 dbs_etherwatch_seek_next_packet(wtap *wth, int *err,
- gchar **err_info)
+ gchar **err_info)
{
- int byte;
- unsigned int level = 0;
- gint64 cur_off;
-
- while ((byte = file_getc(wth->fh)) != EOF) {
- if (byte == dbs_etherwatch_rec_magic[level]) {
- level++;
- if (level >= DBS_ETHERWATCH_REC_MAGIC_SIZE) {
- /* note: we're leaving file pointer right after the magic characters */
- cur_off = file_tell(wth->fh);
- if (cur_off == -1) {
- /* Error. */
- *err = file_error(wth->fh, err_info);
- return -1;
+ int byte;
+ unsigned int level = 0;
+ gint64 cur_off;
+
+ while ((byte = file_getc(wth->fh)) != EOF) {
+ if (byte == dbs_etherwatch_rec_magic[level]) {
+ level++;
+ if (level >= DBS_ETHERWATCH_REC_MAGIC_SIZE) {
+ /* note: we're leaving file pointer right after the magic characters */
+ cur_off = file_tell(wth->fh);
+ if (cur_off == -1) {
+ /* Error. */
+ *err = file_error(wth->fh, err_info);
+ return -1;
+ }
+ return cur_off + 1;
+ }
+ } else {
+ level = 0;
}
- return cur_off + 1;
- }
- } else {
- level = 0;
}
- }
- if (file_eof(wth->fh)) {
- /* We got an EOF. */
- *err = 0;
- } else {
- /* We got an error. */
+ /* EOF or error. */
*err = file_error(wth->fh, err_info);
- }
- return -1;
+ return -1;
}
-#define DBS_ETHERWATCH_HEADER_LINES_TO_CHECK 200
-#define DBS_ETHERWATCH_LINE_LENGTH 240
+#define DBS_ETHERWATCH_HEADER_LINES_TO_CHECK 200
+#define DBS_ETHERWATCH_LINE_LENGTH 240
/* Look through the first part of a file to see if this is
* a DBS Ethertrace text trace file.
static gboolean dbs_etherwatch_check_file_type(wtap *wth, int *err,
gchar **err_info)
{
- char buf[DBS_ETHERWATCH_LINE_LENGTH];
- int line, byte;
- gsize reclen;
- unsigned int i, level;
-
- buf[DBS_ETHERWATCH_LINE_LENGTH-1] = 0;
-
- for (line = 0; line < DBS_ETHERWATCH_HEADER_LINES_TO_CHECK; line++) {
- if (file_gets(buf, DBS_ETHERWATCH_LINE_LENGTH, wth->fh)!=NULL){
-
- reclen = strlen(buf);
- if (reclen < DBS_ETHERWATCH_HDR_MAGIC_SIZE)
- continue;
-
- level = 0;
- for (i = 0; i < reclen; i++) {
- byte = buf[i];
- if (byte == dbs_etherwatch_hdr_magic[level]) {
- level++;
- if (level >=
- DBS_ETHERWATCH_HDR_MAGIC_SIZE) {
- return TRUE;
- }
- }
- else
- level = 0;
- }
- }
- else {
- /* EOF or error. */
- if (file_eof(wth->fh))
- *err = 0;
- else
- *err = file_error(wth->fh, err_info);
- return FALSE;
- }
- }
- *err = 0;
- return FALSE;
+ char buf[DBS_ETHERWATCH_LINE_LENGTH];
+ int line, byte;
+ gsize reclen;
+ unsigned int i, level;
+
+ buf[DBS_ETHERWATCH_LINE_LENGTH-1] = 0;
+
+ for (line = 0; line < DBS_ETHERWATCH_HEADER_LINES_TO_CHECK; line++) {
+ if (file_gets(buf, DBS_ETHERWATCH_LINE_LENGTH, wth->fh) == NULL) {
+ /* EOF or error. */
+ *err = file_error(wth->fh, err_info);
+ return FALSE;
+ }
+
+ reclen = strlen(buf);
+ if (reclen < DBS_ETHERWATCH_HDR_MAGIC_SIZE)
+ continue;
+
+ level = 0;
+ for (i = 0; i < reclen; i++) {
+ byte = buf[i];
+ if (byte == dbs_etherwatch_hdr_magic[level]) {
+ level++;
+ if (level >=
+ DBS_ETHERWATCH_HDR_MAGIC_SIZE) {
+ return TRUE;
+ }
+ }
+ else
+ level = 0;
+ }
+ }
+ *err = 0;
+ return FALSE;
}
-int dbs_etherwatch_open(wtap *wth, int *err, gchar **err_info)
+wtap_open_return_val dbs_etherwatch_open(wtap *wth, int *err, gchar **err_info)
{
- /* Look for DBS ETHERWATCH header */
- if (!dbs_etherwatch_check_file_type(wth, err, err_info)) {
- if (*err == 0)
- return 0;
- else
- return -1;
- }
-
- wth->file_encap = WTAP_ENCAP_ETHERNET;
- wth->file_type = WTAP_FILE_DBS_ETHERWATCH;
- wth->snapshot_length = 0; /* not known */
- wth->subtype_read = dbs_etherwatch_read;
- wth->subtype_seek_read = dbs_etherwatch_seek_read;
- wth->tsprecision = WTAP_FILE_TSPREC_CSEC;
-
- return 1;
+ /* Look for DBS ETHERWATCH header */
+ if (!dbs_etherwatch_check_file_type(wth, err, err_info)) {
+ if (*err != 0 && *err != WTAP_ERR_SHORT_READ)
+ return WTAP_OPEN_ERROR;
+ return WTAP_OPEN_NOT_MINE;
+ }
+
+ wth->file_encap = WTAP_ENCAP_ETHERNET;
+ wth->file_type_subtype = WTAP_FILE_TYPE_SUBTYPE_DBS_ETHERWATCH;
+ wth->snapshot_length = 0; /* not known */
+ wth->subtype_read = dbs_etherwatch_read;
+ wth->subtype_seek_read = dbs_etherwatch_seek_read;
+ wth->file_tsprec = WTAP_TSPREC_CSEC;
+
+ return WTAP_OPEN_MINE;
}
/* Find the next packet and parse it; called from wtap_read(). */
static gboolean dbs_etherwatch_read(wtap *wth, int *err, gchar **err_info,
gint64 *data_offset)
{
- gint64 offset;
- guint8 *buf;
- int pkt_len;
-
- /* Find the next packet */
- offset = dbs_etherwatch_seek_next_packet(wth, err, err_info);
- if (offset < 1)
- return FALSE;
-
- /* Make sure we have enough room for the packet */
- buffer_assure_space(wth->frame_buffer, DBS_ETHERWATCH_MAX_PACKET_LEN);
- buf = buffer_start_ptr(wth->frame_buffer);
-
- /* Parse the packet */
- pkt_len = parse_dbs_etherwatch_packet(wth, wth->fh, buf, err, err_info);
- if (pkt_len == -1)
- return FALSE;
-
- /*
- * We don't have an FCS in this frame.
- */
- wth->phdr.pseudo_header.eth.fcs_len = 0;
-
- *data_offset = offset;
- return TRUE;
+ gint64 offset;
+
+ /* Find the next packet */
+ offset = dbs_etherwatch_seek_next_packet(wth, err, err_info);
+ if (offset < 1)
+ return FALSE;
+ *data_offset = offset;
+
+ /* Parse the packet */
+ return parse_dbs_etherwatch_packet(&wth->phdr, wth->fh,
+ wth->frame_buffer, err, err_info);
}
/* Used to read packets in random-access fashion */
static gboolean
-dbs_etherwatch_seek_read (wtap *wth, gint64 seek_off,
- struct wtap_pkthdr *phdr,
- guint8 *pd, int len, int *err, gchar **err_info)
+dbs_etherwatch_seek_read(wtap *wth, gint64 seek_off,
+ struct wtap_pkthdr *phdr, Buffer *buf, int *err, gchar **err_info)
{
- union wtap_pseudo_header *pseudo_header = &phdr->pseudo_header;
- int pkt_len;
-
- if (file_seek(wth->random_fh, seek_off - 1, SEEK_SET, err) == -1)
- return FALSE;
-
- pkt_len = parse_dbs_etherwatch_packet(NULL, wth->random_fh, pd, err,
- err_info);
-
- if (pkt_len != len) {
- if (pkt_len != -1) {
- *err = WTAP_ERR_BAD_FILE;
- *err_info = g_strdup_printf("dbs_etherwatch: packet length %d doesn't match requested length %d",
- pkt_len, len);
- }
- return FALSE;
- }
-
- /*
- * We don't have an FCS in this frame.
- */
- pseudo_header->eth.fcs_len = 0;
-
- return TRUE;
+ if (file_seek(wth->random_fh, seek_off - 1, SEEK_SET, err) == -1)
+ return FALSE;
+
+ return parse_dbs_etherwatch_packet(phdr, wth->random_fh, buf, err,
+ err_info);
}
/* Parse a packet */
From 00-D0-C0-D2-4D-60 [MF1] to AA-00-04-00-FC-94 [PSERVB]
Protocol 08-00 00 00-00-00-00-00, 50 byte buffer at 10-OCT-2001 10:20:45.17
*/
-#define MAC_ADDR_LENGTH 6 /* Length MAC address */
-#define DEST_MAC_PREFIX "] to " /* Prefix to the dest. MAC address */
-#define PROTOCOL_LENGTH 2 /* Length protocol */
-#define PROTOCOL_POS 9 /* Position protocol */
-#define SAP_LENGTH 2 /* Length DSAP+SSAP */
-#define SAP_POS 9 /* Position DSAP+SSAP */
-#define CTL_UNNUMB_LENGTH 1 /* Length unnumbered control field */
-#define CTL_NUMB_LENGTH 2 /* Length numbered control field */
-#define CTL_POS 15 /* Position control field */
-#define PID_LENGTH 5 /* Length PID */
-#define PID_POS 18 /* Position PID */
-#define LENGTH_POS 33 /* Position length */
-#define HEX_HDR_SPR '-' /* Seperator char header hex values */
-#define HEX_HDR_END ' ' /* End char hdr. hex val. except PID */
-#define HEX_PID_END ',' /* End char PID hex value */
-#define IEEE802_LEN_LEN 2 /* Length of the IEEE 802 len. field */
+#define MAC_ADDR_LENGTH 6 /* Length MAC address */
+#define DEST_MAC_PREFIX "] to " /* Prefix to the dest. MAC address */
+#define PROTOCOL_LENGTH 2 /* Length protocol */
+#define PROTOCOL_POS 9 /* Position protocol */
+#define SAP_LENGTH 2 /* Length DSAP+SSAP */
+#define SAP_POS 9 /* Position DSAP+SSAP */
+#define CTL_UNNUMB_LENGTH 1 /* Length unnumbered control field */
+#define CTL_NUMB_LENGTH 2 /* Length numbered control field */
+#define CTL_POS 15 /* Position control field */
+#define PID_LENGTH 5 /* Length PID */
+#define PID_POS 18 /* Position PID */
+#define LENGTH_POS 33 /* Position length */
+#define HEX_HDR_SPR '-' /* Seperator char header hex values */
+#define HEX_HDR_END ' ' /* End char hdr. hex val. except PID */
+#define HEX_PID_END ',' /* End char PID hex value */
+#define IEEE802_LEN_LEN 2 /* Length of the IEEE 802 len. field */
/*
To check whether it is Ethernet II or IEEE 802 we check the values of the
control field and PID, when they are all 0's we assume it is Ethernet II
To check whether it IEEE 802.3 with SNAP we check that both the DSAP & SSAP
values are 0xAA and the control field 0x03.
*/
-#define SNAP_CHECK_POS 9
-#define SNAP_CHECK_STR "AA-AA 03"
+#define SNAP_CHECK_POS 9
+#define SNAP_CHECK_STR "AA-AA 03"
/*
To check whether the control field is 1 or two octets we check if it is
unnumbered. Unnumbered has length 1, numbered 2.
*/
-#define CTL_UNNUMB_MASK 0x03
-#define CTL_UNNUMB_VALUE 0x03
-static int
-parse_dbs_etherwatch_packet(wtap *wth, FILE_T fh, guint8* buf, int *err,
- gchar **err_info)
+#define CTL_UNNUMB_MASK 0x03
+#define CTL_UNNUMB_VALUE 0x03
+static gboolean
+parse_dbs_etherwatch_packet(struct wtap_pkthdr *phdr, FILE_T fh, Buffer* buf,
+ int *err, gchar **err_info)
{
- char line[DBS_ETHERWATCH_LINE_LENGTH];
- int num_items_scanned;
- int eth_hdr_len, pkt_len, csec;
- int length_pos, length_from, length;
- struct tm tm;
- char mon[4] = "xxx";
- gchar *p;
- static const gchar months[] = "JANFEBMARAPRMAYJUNJULAUGSEPOCTNOVDEC";
- int count, line_count;
-
- eth_hdr_len = 0;
- memset(&tm, 0, sizeof(tm));
- /* Our file pointer should be on the first line containing the
- * summary information for a packet. Read in that line and
- * extract the useful information
- */
- if (file_gets(line, DBS_ETHERWATCH_LINE_LENGTH, fh) == NULL) {
- *err = file_error(fh, err_info);
- if (*err == 0) {
- *err = WTAP_ERR_SHORT_READ;
- }
- return -1;
- }
-
- /* Get the destination address */
- p = strstr(line, DEST_MAC_PREFIX);
- if(!p) {
- *err = WTAP_ERR_BAD_FILE;
- *err_info = g_strdup("dbs_etherwatch: destination address not found");
- return -1;
- }
- p += strlen(DEST_MAC_PREFIX);
- if(parse_hex_dump(p, &buf[eth_hdr_len], HEX_HDR_SPR, HEX_HDR_END)
- != MAC_ADDR_LENGTH) {
- *err = WTAP_ERR_BAD_FILE;
- *err_info = g_strdup("dbs_etherwatch: destination address not valid");
- return -1;
- }
- eth_hdr_len += MAC_ADDR_LENGTH;
-
- /* Get the source address */
- /*
- * Since the first part of the line is already skipped in order to find
- * the start of the record we cannot index, just look for the first
- * 'HEX' character
- */
- p = line;
- while(!isxdigit((guchar)*p)) {
- p++;
- }
- if(parse_hex_dump(p, &buf[eth_hdr_len], HEX_HDR_SPR,
- HEX_HDR_END) != MAC_ADDR_LENGTH) {
- *err = WTAP_ERR_BAD_FILE;
- *err_info = g_strdup("dbs_etherwatch: source address not valid");
- return -1;
- }
- eth_hdr_len += MAC_ADDR_LENGTH;
-
- /* Read the next line of the record header */
- if (file_gets(line, DBS_ETHERWATCH_LINE_LENGTH, fh) == NULL) {
- *err = file_error(fh, err_info);
- if (*err == 0) {
- *err = WTAP_ERR_SHORT_READ;
- }
- return -1;
- }
-
- /* Check the lines is as least as long as the length position */
- if(strlen(line) < LENGTH_POS) {
- *err = WTAP_ERR_BAD_FILE;
- *err_info = g_strdup("dbs_etherwatch: line too short");
- return -1;
- }
-
- num_items_scanned = sscanf(line + LENGTH_POS,
- "%9d byte buffer at %2d-%3s-%4d %2d:%2d:%2d.%9d",
- &pkt_len,
- &tm.tm_mday, mon,
- &tm.tm_year, &tm.tm_hour, &tm.tm_min,
- &tm.tm_sec, &csec);
-
- if (num_items_scanned != 8) {
- *err = WTAP_ERR_BAD_FILE;
- *err_info = g_strdup("dbs_etherwatch: header line not valid");
- return -1;
- }
-
- /* Determine whether it is Ethernet II or IEEE 802 */
- if(strncmp(&line[ETH_II_CHECK_POS], ETH_II_CHECK_STR,
- strlen(ETH_II_CHECK_STR)) == 0) {
- /* Ethernet II */
- /* Get the Protocol */
- if(parse_hex_dump(&line[PROTOCOL_POS], &buf[eth_hdr_len], HEX_HDR_SPR,
- HEX_HDR_END) != PROTOCOL_LENGTH) {
- *err = WTAP_ERR_BAD_FILE;
- *err_info = g_strdup("dbs_etherwatch: Ethernet II protocol value not valid");
- return -1;
- }
- eth_hdr_len += PROTOCOL_LENGTH;
- } else {
- /* IEEE 802 */
- /* Remember where to put the length in the header */
- length_pos = eth_hdr_len;
- /* Leave room in the header for the length */
- eth_hdr_len += IEEE802_LEN_LEN;
- /* Remember how much of the header should not be added to the length */
- length_from = eth_hdr_len;
- /* Get the DSAP + SSAP */
- if(parse_hex_dump(&line[SAP_POS], &buf[eth_hdr_len], HEX_HDR_SPR,
- HEX_HDR_END) != SAP_LENGTH) {
- *err = WTAP_ERR_BAD_FILE;
- *err_info = g_strdup("dbs_etherwatch: 802.2 DSAP+SSAP value not valid");
- return -1;
- }
- eth_hdr_len += SAP_LENGTH;
- /* Get the (first part of the) control field */
- if(parse_hex_dump(&line[CTL_POS], &buf[eth_hdr_len], HEX_HDR_SPR,
- HEX_HDR_END) != CTL_UNNUMB_LENGTH) {
- *err = WTAP_ERR_BAD_FILE;
- *err_info = g_strdup("dbs_etherwatch: 802.2 control field first part not valid");
- return -1;
- }
- /* Determine whether the control is numbered, and thus longer */
- if((buf[eth_hdr_len] & CTL_UNNUMB_MASK) != CTL_UNNUMB_VALUE) {
- /* Get the rest of the control field, the first octet in the PID */
- if(parse_hex_dump(&line[PID_POS],
- &buf[eth_hdr_len + CTL_UNNUMB_LENGTH], HEX_HDR_END,
- HEX_HDR_SPR) != CTL_NUMB_LENGTH - CTL_UNNUMB_LENGTH) {
- *err = WTAP_ERR_BAD_FILE;
- *err_info = g_strdup("dbs_etherwatch: 802.2 control field second part value not valid");
- return -1;
- }
- eth_hdr_len += CTL_NUMB_LENGTH;
- } else {
- eth_hdr_len += CTL_UNNUMB_LENGTH;
- }
- /* Determine whether it is SNAP */
- if(strncmp(&line[SNAP_CHECK_POS], SNAP_CHECK_STR,
- strlen(SNAP_CHECK_STR)) == 0) {
- /* Get the PID */
- if(parse_hex_dump(&line[PID_POS], &buf[eth_hdr_len], HEX_HDR_SPR,
- HEX_PID_END) != PID_LENGTH) {
- *err = WTAP_ERR_BAD_FILE;
- *err_info = g_strdup("dbs_etherwatch: 802.2 PID value not valid");
- return -1;
- }
- eth_hdr_len += PID_LENGTH;
- }
- /* Write the length in the header */
- length = eth_hdr_len - length_from + pkt_len;
- buf[length_pos] = (length) >> 8;
- buf[length_pos+1] = (length) & 0xFF;
- }
-
- if (wth) {
- wth->phdr.presence_flags = WTAP_HAS_TS|WTAP_HAS_CAP_LEN;
-
- p = strstr(months, mon);
- if (p)
- tm.tm_mon = (int)(p - months) / 3;
- tm.tm_year -= 1900;
-
- tm.tm_isdst = -1;
- wth->phdr.ts.secs = mktime(&tm);
- wth->phdr.ts.nsecs = csec * 10000000;
- wth->phdr.caplen = eth_hdr_len + pkt_len;
- wth->phdr.len = eth_hdr_len + pkt_len;
- }
-
- /* Parse the hex dump */
- count = 0;
- while (count < pkt_len) {
- if (file_gets(line, DBS_ETHERWATCH_LINE_LENGTH, fh) == NULL) {
- *err = file_error(fh, err_info);
- if (*err == 0) {
- *err = WTAP_ERR_SHORT_READ;
- }
- return -1;
- }
- if (!(line_count = parse_single_hex_dump_line(line,
- &buf[eth_hdr_len + count], count))) {
- *err = WTAP_ERR_BAD_FILE;
- *err_info = g_strdup("dbs_etherwatch: packet data value not valid");
- return -1;
- }
- count += line_count;
- if (count > pkt_len) {
- *err = WTAP_ERR_BAD_FILE;
- *err_info = g_strdup("dbs_etherwatch: packet data value has too many bytes");
- return -1;
- }
- }
- return eth_hdr_len + pkt_len;
+ guint8 *pd;
+ char line[DBS_ETHERWATCH_LINE_LENGTH];
+ int num_items_scanned;
+ int eth_hdr_len, pkt_len, csec;
+ int length_pos, length_from, length;
+ struct tm tm;
+ char mon[4] = "xxx";
+ gchar *p;
+ static const gchar months[] = "JANFEBMARAPRMAYJUNJULAUGSEPOCTNOVDEC";
+ int count, line_count;
+
+ /* Make sure we have enough room for a regular Ethernet packet */
+ ws_buffer_assure_space(buf, DBS_ETHERWATCH_MAX_ETHERNET_PACKET_LEN);
+ pd = ws_buffer_start_ptr(buf);
+
+ eth_hdr_len = 0;
+ memset(&tm, 0, sizeof(tm));
+ /* Our file pointer should be on the first line containing the
+ * summary information for a packet. Read in that line and
+ * extract the useful information
+ */
+ if (file_gets(line, DBS_ETHERWATCH_LINE_LENGTH, fh) == NULL) {
+ *err = file_error(fh, err_info);
+ if (*err == 0) {
+ *err = WTAP_ERR_SHORT_READ;
+ }
+ return FALSE;
+ }
+
+ /* Get the destination address */
+ p = strstr(line, DEST_MAC_PREFIX);
+ if(!p) {
+ *err = WTAP_ERR_BAD_FILE;
+ *err_info = g_strdup("dbs_etherwatch: destination address not found");
+ return FALSE;
+ }
+ p += strlen(DEST_MAC_PREFIX);
+ if(parse_hex_dump(p, &pd[eth_hdr_len], HEX_HDR_SPR, HEX_HDR_END)
+ != MAC_ADDR_LENGTH) {
+ *err = WTAP_ERR_BAD_FILE;
+ *err_info = g_strdup("dbs_etherwatch: destination address not valid");
+ return FALSE;
+ }
+ eth_hdr_len += MAC_ADDR_LENGTH;
+
+ /* Get the source address */
+ /*
+ * Since the first part of the line is already skipped in order to find
+ * the start of the record we cannot index, just look for the first
+ * 'HEX' character
+ */
+ p = line;
+ while(!g_ascii_isxdigit(*p)) {
+ p++;
+ }
+ if(parse_hex_dump(p, &pd[eth_hdr_len], HEX_HDR_SPR,
+ HEX_HDR_END) != MAC_ADDR_LENGTH) {
+ *err = WTAP_ERR_BAD_FILE;
+ *err_info = g_strdup("dbs_etherwatch: source address not valid");
+ return FALSE;
+ }
+ eth_hdr_len += MAC_ADDR_LENGTH;
+
+ /* Read the next line of the record header */
+ if (file_gets(line, DBS_ETHERWATCH_LINE_LENGTH, fh) == NULL) {
+ *err = file_error(fh, err_info);
+ if (*err == 0) {
+ *err = WTAP_ERR_SHORT_READ;
+ }
+ return FALSE;
+ }
+
+ /* Check the lines is as least as long as the length position */
+ if(strlen(line) < LENGTH_POS) {
+ *err = WTAP_ERR_BAD_FILE;
+ *err_info = g_strdup("dbs_etherwatch: line too short");
+ return FALSE;
+ }
+
+ num_items_scanned = sscanf(line + LENGTH_POS,
+ "%9d byte buffer at %2d-%3s-%4d %2d:%2d:%2d.%9d",
+ &pkt_len,
+ &tm.tm_mday, mon,
+ &tm.tm_year, &tm.tm_hour, &tm.tm_min,
+ &tm.tm_sec, &csec);
+
+ if (num_items_scanned != 8) {
+ *err = WTAP_ERR_BAD_FILE;
+ *err_info = g_strdup("dbs_etherwatch: header line not valid");
+ return FALSE;
+ }
+
+ if (pkt_len < 0) {
+ *err = WTAP_ERR_BAD_FILE;
+ *err_info = g_strdup("dbs_etherwatch: packet header has a negative packet length");
+ return FALSE;
+ }
+
+ /* Determine whether it is Ethernet II or IEEE 802 */
+ if(strncmp(&line[ETH_II_CHECK_POS], ETH_II_CHECK_STR,
+ strlen(ETH_II_CHECK_STR)) == 0) {
+ /* Ethernet II */
+ /* Get the Protocol */
+ if(parse_hex_dump(&line[PROTOCOL_POS], &pd[eth_hdr_len], HEX_HDR_SPR,
+ HEX_HDR_END) != PROTOCOL_LENGTH) {
+ *err = WTAP_ERR_BAD_FILE;
+ *err_info = g_strdup("dbs_etherwatch: Ethernet II protocol value not valid");
+ return FALSE;
+ }
+ eth_hdr_len += PROTOCOL_LENGTH;
+ } else {
+ /* IEEE 802 */
+ /* Remember where to put the length in the header */
+ length_pos = eth_hdr_len;
+ /* Leave room in the header for the length */
+ eth_hdr_len += IEEE802_LEN_LEN;
+ /* Remember how much of the header should not be added to the length */
+ length_from = eth_hdr_len;
+ /* Get the DSAP + SSAP */
+ if(parse_hex_dump(&line[SAP_POS], &pd[eth_hdr_len], HEX_HDR_SPR,
+ HEX_HDR_END) != SAP_LENGTH) {
+ *err = WTAP_ERR_BAD_FILE;
+ *err_info = g_strdup("dbs_etherwatch: 802.2 DSAP+SSAP value not valid");
+ return FALSE;
+ }
+ eth_hdr_len += SAP_LENGTH;
+ /* Get the (first part of the) control field */
+ if(parse_hex_dump(&line[CTL_POS], &pd[eth_hdr_len], HEX_HDR_SPR,
+ HEX_HDR_END) != CTL_UNNUMB_LENGTH) {
+ *err = WTAP_ERR_BAD_FILE;
+ *err_info = g_strdup("dbs_etherwatch: 802.2 control field first part not valid");
+ return FALSE;
+ }
+ /* Determine whether the control is numbered, and thus longer */
+ if((pd[eth_hdr_len] & CTL_UNNUMB_MASK) != CTL_UNNUMB_VALUE) {
+ /* Get the rest of the control field, the first octet in the PID */
+ if(parse_hex_dump(&line[PID_POS],
+ &pd[eth_hdr_len + CTL_UNNUMB_LENGTH], HEX_HDR_END,
+ HEX_HDR_SPR) != CTL_NUMB_LENGTH - CTL_UNNUMB_LENGTH) {
+ *err = WTAP_ERR_BAD_FILE;
+ *err_info = g_strdup("dbs_etherwatch: 802.2 control field second part value not valid");
+ return FALSE;
+ }
+ eth_hdr_len += CTL_NUMB_LENGTH;
+ } else {
+ eth_hdr_len += CTL_UNNUMB_LENGTH;
+ }
+ /* Determine whether it is SNAP */
+ if(strncmp(&line[SNAP_CHECK_POS], SNAP_CHECK_STR,
+ strlen(SNAP_CHECK_STR)) == 0) {
+ /* Get the PID */
+ if(parse_hex_dump(&line[PID_POS], &pd[eth_hdr_len], HEX_HDR_SPR,
+ HEX_PID_END) != PID_LENGTH) {
+ *err = WTAP_ERR_BAD_FILE;
+ *err_info = g_strdup("dbs_etherwatch: 802.2 PID value not valid");
+ return FALSE;
+ }
+ eth_hdr_len += PID_LENGTH;
+ }
+ /* Write the length in the header */
+ length = eth_hdr_len - length_from + pkt_len;
+ pd[length_pos] = (length) >> 8;
+ pd[length_pos+1] = (length) & 0xFF;
+ }
+
+ phdr->rec_type = REC_TYPE_PACKET;
+ phdr->presence_flags = WTAP_HAS_TS|WTAP_HAS_CAP_LEN;
+
+ p = strstr(months, mon);
+ if (p)
+ tm.tm_mon = (int)(p - months) / 3;
+ tm.tm_year -= 1900;
+
+ tm.tm_isdst = -1;
+ phdr->ts.secs = mktime(&tm);
+ phdr->ts.nsecs = csec * 10000000;
+ phdr->caplen = eth_hdr_len + pkt_len;
+ phdr->len = eth_hdr_len + pkt_len;
+
+ if (phdr->caplen > WTAP_MAX_PACKET_SIZE) {
+ /*
+ * Probably a corrupt capture file; return an error,
+ * so that our caller doesn't blow up trying to allocate
+ * space for an immensely-large packet.
+ */
+ *err = WTAP_ERR_BAD_FILE;
+ *err_info = g_strdup_printf("dbs_etherwatch: File has %u-byte packet, bigger than maximum of %u",
+ phdr->caplen, WTAP_MAX_PACKET_SIZE);
+ return FALSE;
+ }
+
+ /* Make sure we have enough room, even for an oversized Ethernet packet */
+ ws_buffer_assure_space(buf, phdr->caplen);
+ pd = ws_buffer_start_ptr(buf);
+
+ /*
+ * We don't have an FCS in this frame.
+ */
+ phdr->pseudo_header.eth.fcs_len = 0;
+
+ /* Parse the hex dump */
+ count = 0;
+ while (count < pkt_len) {
+ if (file_gets(line, DBS_ETHERWATCH_LINE_LENGTH, fh) == NULL) {
+ *err = file_error(fh, err_info);
+ if (*err == 0) {
+ *err = WTAP_ERR_SHORT_READ;
+ }
+ return FALSE;
+ }
+ if (!(line_count = parse_single_hex_dump_line(line,
+ &pd[eth_hdr_len + count], count))) {
+ *err = WTAP_ERR_BAD_FILE;
+ *err_info = g_strdup("dbs_etherwatch: packet data value not valid");
+ return FALSE;
+ }
+ count += line_count;
+ if (count > pkt_len) {
+ *err = WTAP_ERR_BAD_FILE;
+ *err_info = g_strdup("dbs_etherwatch: packet data value has too many bytes");
+ return FALSE;
+ }
+ }
+ return TRUE;
}
/* Parse a hex dump line */
*/
-#define TYPE_CHECK_POS 2 /* Position to check the type of hex dump */
-#define TYPE_CHECK_BOTH '[' /* Value at pos. that indicates BOTH type */
-#define COUNT_POS_BOTH 21 /* Count position BOTH type */
-#define COUNT_POS_HEX 1 /* Count position HEX type */
-#define COUNT_SIZE 5 /* Length counter */
-#define HEX_DUMP_START '[' /* Start char */
-#define HEX_DUMP_SPR ' ' /* Seperator char */
-#define HEX_DUMP_END ']' /* End char */
+#define TYPE_CHECK_POS 2 /* Position to check the type of hex dump */
+#define TYPE_CHECK_BOTH '[' /* Value at pos. that indicates BOTH type */
+#define COUNT_POS_BOTH 21 /* Count position BOTH type */
+#define COUNT_POS_HEX 1 /* Count position HEX type */
+#define COUNT_SIZE 5 /* Length counter */
+#define HEX_DUMP_START '[' /* Start char */
+#define HEX_DUMP_SPR ' ' /* Seperator char */
+#define HEX_DUMP_END ']' /* End char */
/* Take a string representing one line from a hex dump and converts the
* text to binary data. We check the printed offset with the offset
static guint
parse_single_hex_dump_line(char* rec, guint8 *buf, int byte_offset) {
- int pos, i;
- int value;
-
-
- /* Check that the record is as least as long as the check offset */
- for(i = 0; i < TYPE_CHECK_POS; i++)
- {
- if(rec[i] == '\0') {
- return 0;
- }
- }
- /* determine the format and thus the counter offset and hex dump length */
- if(rec[TYPE_CHECK_POS] == TYPE_CHECK_BOTH)
- {
- pos = COUNT_POS_BOTH;
- }
- else
- {
- pos = COUNT_POS_HEX;
- }
-
- /* Check that the record is as least as long as the start position */
- while(i < pos)
- {
- if(rec[i] == '\0') {
- return 0;
- }
- i++;
- }
-
- /* Get the byte_offset directly from the record */
- value = 0;
- for(i = 0; i < COUNT_SIZE; i++) {
- if(!isspace((guchar)rec[pos])) {
- if(isdigit((guchar)rec[pos])) {
- value *= 10;
- value += rec[pos] - '0';
- } else {
- return 0;
- }
- }
- pos++;
- }
-
- if (value != byte_offset) {
- return 0;
- }
-
- /* find the start of the hex dump */
- while(rec[pos] != HEX_DUMP_START) {
- if(rec[pos] == '\0') {
- return 0;
- }
- pos++;
- }
- pos++;
- return parse_hex_dump(&rec[pos], buf, HEX_DUMP_SPR, HEX_DUMP_END);
+ int pos, i;
+ int value;
+
+
+ /* Check that the record is as least as long as the check offset */
+ for(i = 0; i < TYPE_CHECK_POS; i++)
+ {
+ if(rec[i] == '\0') {
+ return 0;
+ }
+ }
+ /* determine the format and thus the counter offset and hex dump length */
+ if(rec[TYPE_CHECK_POS] == TYPE_CHECK_BOTH)
+ {
+ pos = COUNT_POS_BOTH;
+ }
+ else
+ {
+ pos = COUNT_POS_HEX;
+ }
+
+ /* Check that the record is as least as long as the start position */
+ while(i < pos)
+ {
+ if(rec[i] == '\0') {
+ return 0;
+ }
+ i++;
+ }
+
+ /* Get the byte_offset directly from the record */
+ value = 0;
+ for(i = 0; i < COUNT_SIZE; i++) {
+ if(!g_ascii_isspace(rec[pos])) {
+ if(g_ascii_isdigit(rec[pos])) {
+ value *= 10;
+ value += rec[pos] - '0';
+ } else {
+ return 0;
+ }
+ }
+ pos++;
+ }
+
+ if (value != byte_offset) {
+ return 0;
+ }
+
+ /* find the start of the hex dump */
+ while(rec[pos] != HEX_DUMP_START) {
+ if(rec[pos] == '\0') {
+ return 0;
+ }
+ pos++;
+ }
+ pos++;
+ return parse_hex_dump(&rec[pos], buf, HEX_DUMP_SPR, HEX_DUMP_END);
}
/* Parse a hex dump */
static guint
parse_hex_dump(char* dump, guint8 *buf, char seperator, char end) {
- int pos, count;
-
- /* Parse the hex dump */
- pos = 0;
- count = 0;
- while(dump[pos] != end) {
- /* Check the hex value */
- if(!(isxdigit((guchar)dump[pos]) &&
- isxdigit((guchar)dump[pos + 1]))) {
- return 0;
- }
- /* Get the hex value value */
- if(isdigit((guchar)dump[pos])) {
- buf[count] = (dump[pos] - '0') << 4;
- } else {
- buf[count] = (toupper(dump[pos]) - 'A' + 10) << 4;
- }
- pos++;
- if(isdigit((guchar)dump[pos])) {
- buf[count] += dump[pos] - '0';
- } else {
- buf[count] += toupper(dump[pos]) - 'A' + 10;
- }
- pos++;
- count++;
- /* Skip the seperator characters */
- while(dump[pos] == seperator) {
- pos++;
- }
- }
- return count;
+ int pos, count;
+
+ /* Parse the hex dump */
+ pos = 0;
+ count = 0;
+ while(dump[pos] != end) {
+ /* Check the hex value */
+ if(!(g_ascii_isxdigit(dump[pos]) &&
+ g_ascii_isxdigit(dump[pos + 1]))) {
+ return 0;
+ }
+ /* Get the hex value value */
+ if(g_ascii_isdigit(dump[pos])) {
+ buf[count] = (dump[pos] - '0') << 4;
+ } else {
+ buf[count] = (g_ascii_toupper(dump[pos]) - 'A' + 10) << 4;
+ }
+ pos++;
+ if(g_ascii_isdigit(dump[pos])) {
+ buf[count] += dump[pos] - '0';
+ } else {
+ buf[count] += g_ascii_toupper(dump[pos]) - 'A' + 10;
+ }
+ pos++;
+ count++;
+ /* Skip the seperator characters */
+ while(dump[pos] == seperator) {
+ pos++;
+ }
+ }
+ return count;
}
+
+/*
+ * Editor modelines - http://www.wireshark.org/tools/modelines.html
+ *
+ * Local variables:
+ * c-basic-offset: 4
+ * tab-width: 8
+ * indent-tabs-mode: nil
+ * End:
+ *
+ * vi: set shiftwidth=4 tabstop=8 expandtab:
+ * :indentSize=4:tabSize=8:noTabs=true:
+ */
git.samba.org / metze / wireshark / wip.git / blobdiff