forked from osmocom/wireshark
![Guy Harris](/assets/img/avatar_default.png)
Change all wireshark.org URLs to use https. Fix some broken links while we're at it. Change-Id: I161bf8eeca43b8027605acea666032da86f5ea1c Reviewed-on: https://code.wireshark.org/review/34089 Reviewed-by: Guy Harris <guy@alum.mit.edu>
461 lines
14 KiB
C
461 lines
14 KiB
C
/* netscreen.c
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*
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* Juniper NetScreen snoop output parser
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* Created by re-using a lot of code from cosine.c
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* Copyright (c) 2007 by Sake Blok <sake@euronet.nl>
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*
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* Wiretap Library
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* Copyright (c) 1998 by Gilbert Ramirez <gram@alumni.rice.edu>
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*
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* SPDX-License-Identifier: GPL-2.0-or-later
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*/
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#include "config.h"
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#include "wtap-int.h"
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#include "netscreen.h"
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#include "file_wrappers.h"
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#include <stdlib.h>
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#include <string.h>
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/* XXX TODO:
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*
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* o Construct a list of interfaces, with interface names, give
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* them link-layer types based on the interface name and packet
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* data, and supply interface IDs with each packet (i.e., make
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* this supply a pcapng-style set of interfaces and associate
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* packets with interfaces). This is probably the right way
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* to "Pass the interface names and the traffic direction to either
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* the frame-structure, a pseudo-header or use PPI." See the
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* message at
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*
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* https://www.wireshark.org/lists/wireshark-dev/200708/msg00029.html
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*
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* to see whether any further discussion is still needed. I suspect
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* it doesn't; pcapng existed at the time, as per the final
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* message in that thread:
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*
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* https://www.wireshark.org/lists/wireshark-dev/200708/msg00039.html
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*
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* but I don't think we fully *supported* it at that point. Now
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* that we do, we have the infrastructure to support this, except
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* that we currently have no way to translate interface IDs to
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* interface names in the "frame" dissector or to supply interface
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* information as part of the packet metadata from Wiretap modules.
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* That should be fixed so that we can show interface information,
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* such as the interface name, in packet dissections from, for example,
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* pcapng captures.
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*/
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static gboolean info_line(const gchar *line);
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static gint64 netscreen_seek_next_packet(wtap *wth, int *err, gchar **err_info,
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char *hdr);
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static gboolean netscreen_check_file_type(wtap *wth, int *err,
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gchar **err_info);
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static gboolean netscreen_read(wtap *wth, wtap_rec *rec, Buffer *buf,
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int *err, gchar **err_info, gint64 *data_offset);
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static gboolean netscreen_seek_read(wtap *wth, gint64 seek_off,
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wtap_rec *rec, Buffer *buf, int *err, gchar **err_info);
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static gboolean parse_netscreen_packet(FILE_T fh, wtap_rec *rec,
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Buffer* buf, char *line, int *err, gchar **err_info);
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static int parse_single_hex_dump_line(char* rec, guint8 *buf,
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guint byte_offset);
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/* Returns TRUE if the line appears to be a line with protocol info.
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Otherwise it returns FALSE. */
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static gboolean info_line(const gchar *line)
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{
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int i=NETSCREEN_SPACES_ON_INFO_LINE;
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while (i-- > 0) {
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if (g_ascii_isspace(*line)) {
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line++;
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continue;
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} else {
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return FALSE;
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}
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}
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return TRUE;
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}
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/* Seeks to the beginning of the next packet, and returns the
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byte offset. Copy the header line to hdr. Returns -1 on failure,
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and sets "*err" to the error and sets "*err_info" to null or an
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additional error string. */
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static gint64 netscreen_seek_next_packet(wtap *wth, int *err, gchar **err_info,
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char *hdr)
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{
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gint64 cur_off;
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char buf[NETSCREEN_LINE_LENGTH];
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while (1) {
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cur_off = file_tell(wth->fh);
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if (cur_off == -1) {
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/* Error */
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*err = file_error(wth->fh, err_info);
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return -1;
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}
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if (file_gets(buf, sizeof(buf), wth->fh) == NULL) {
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/* EOF or error. */
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*err = file_error(wth->fh, err_info);
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break;
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}
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if (strstr(buf, NETSCREEN_REC_MAGIC_STR1) ||
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strstr(buf, NETSCREEN_REC_MAGIC_STR2)) {
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g_strlcpy(hdr, buf, NETSCREEN_LINE_LENGTH);
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return cur_off;
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}
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}
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return -1;
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}
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/* Look through the first part of a file to see if this is
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* NetScreen snoop output.
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*
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* Returns TRUE if it is, FALSE if it isn't or if we get an I/O error;
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* if we get an I/O error, "*err" will be set to a non-zero value and
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* "*err_info" is set to null or an additional error string.
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*/
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static gboolean netscreen_check_file_type(wtap *wth, int *err, gchar **err_info)
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{
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char buf[NETSCREEN_LINE_LENGTH];
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guint reclen, line;
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buf[NETSCREEN_LINE_LENGTH-1] = '\0';
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for (line = 0; line < NETSCREEN_HEADER_LINES_TO_CHECK; line++) {
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if (file_gets(buf, NETSCREEN_LINE_LENGTH, wth->fh) == NULL) {
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/* EOF or error. */
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*err = file_error(wth->fh, err_info);
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return FALSE;
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}
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reclen = (guint) strlen(buf);
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if (reclen < MIN(strlen(NETSCREEN_HDR_MAGIC_STR1), strlen(NETSCREEN_HDR_MAGIC_STR2))) {
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continue;
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}
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if (strstr(buf, NETSCREEN_HDR_MAGIC_STR1) ||
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strstr(buf, NETSCREEN_HDR_MAGIC_STR2)) {
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return TRUE;
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}
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}
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*err = 0;
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return FALSE;
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}
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wtap_open_return_val netscreen_open(wtap *wth, int *err, gchar **err_info)
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{
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/* Look for a NetScreen snoop header line */
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if (!netscreen_check_file_type(wth, err, err_info)) {
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if (*err != 0 && *err != WTAP_ERR_SHORT_READ)
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return WTAP_OPEN_ERROR;
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return WTAP_OPEN_NOT_MINE;
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}
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if (file_seek(wth->fh, 0L, SEEK_SET, err) == -1) /* rewind */
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return WTAP_OPEN_ERROR;
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wth->file_encap = WTAP_ENCAP_UNKNOWN;
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wth->file_type_subtype = WTAP_FILE_TYPE_SUBTYPE_NETSCREEN;
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wth->snapshot_length = 0; /* not known */
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wth->subtype_read = netscreen_read;
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wth->subtype_seek_read = netscreen_seek_read;
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wth->file_tsprec = WTAP_TSPREC_DSEC;
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return WTAP_OPEN_MINE;
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}
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/* Find the next packet and parse it; called from wtap_read(). */
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static gboolean netscreen_read(wtap *wth, wtap_rec *rec, Buffer *buf,
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int *err, gchar **err_info, gint64 *data_offset)
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{
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gint64 offset;
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char line[NETSCREEN_LINE_LENGTH];
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/* Find the next packet */
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offset = netscreen_seek_next_packet(wth, err, err_info, line);
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if (offset < 0)
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return FALSE;
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/* Parse the header and convert the ASCII hex dump to binary data */
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if (!parse_netscreen_packet(wth->fh, rec, buf, line, err, err_info))
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return FALSE;
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/*
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* If the per-file encapsulation isn't known, set it to this
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* packet's encapsulation.
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*
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* If it *is* known, and it isn't this packet's encapsulation,
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* set it to WTAP_ENCAP_PER_PACKET, as this file doesn't
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* have a single encapsulation for all packets in the file.
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*/
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if (wth->file_encap == WTAP_ENCAP_UNKNOWN)
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wth->file_encap = rec->rec_header.packet_header.pkt_encap;
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else {
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if (wth->file_encap != rec->rec_header.packet_header.pkt_encap)
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wth->file_encap = WTAP_ENCAP_PER_PACKET;
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}
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*data_offset = offset;
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return TRUE;
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}
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/* Used to read packets in random-access fashion */
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static gboolean
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netscreen_seek_read(wtap *wth, gint64 seek_off, wtap_rec *rec, Buffer *buf,
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int *err, gchar **err_info)
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{
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char line[NETSCREEN_LINE_LENGTH];
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if (file_seek(wth->random_fh, seek_off, SEEK_SET, err) == -1) {
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return FALSE;
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}
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if (file_gets(line, NETSCREEN_LINE_LENGTH, wth->random_fh) == NULL) {
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*err = file_error(wth->random_fh, err_info);
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if (*err == 0) {
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*err = WTAP_ERR_SHORT_READ;
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}
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return FALSE;
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}
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return parse_netscreen_packet(wth->random_fh, rec, buf, line,
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err, err_info);
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}
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/* Parses a packet record header. There are a few possible formats:
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*
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* XXX list extra formats here!
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6843828.0: trust(o) len=98:00121ebbd132->00600868d659/0800
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192.168.1.1 -> 192.168.1.10/6
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vhl=45, tos=00, id=37739, frag=0000, ttl=64 tlen=84
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tcp:ports 2222->2333, seq=3452113890, ack=1540618280, flag=5018/ACK
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00 60 08 68 d6 59 00 12 1e bb d1 32 08 00 45 00 .`.h.Y.....2..E.
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00 54 93 6b 00 00 40 06 63 dd c0 a8 01 01 c0 a8 .T.k..@.c.......
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01 0a 08 ae 09 1d cd c3 13 e2 5b d3 f8 28 50 18 ..........[..(P.
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1f d4 79 21 00 00 e7 76 89 64 16 e2 19 0a 80 09 ..y!...v.d......
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31 e7 04 28 04 58 f3 d9 b1 9f 3d 65 1a db d8 61 1..(.X....=e...a
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2c 21 b6 d3 20 60 0c 8c 35 98 88 cf 20 91 0e a9 ,!...`..5.......
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1d 0b ..
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*/
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static gboolean
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parse_netscreen_packet(FILE_T fh, wtap_rec *rec, Buffer* buf,
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char *line, int *err, gchar **err_info)
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{
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int pkt_len;
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int sec;
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int dsec;
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char cap_int[NETSCREEN_MAX_INT_NAME_LENGTH];
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char direction[2];
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char cap_src[13];
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char cap_dst[13];
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guint8 *pd;
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gchar *p;
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int n, i = 0;
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int offset = 0;
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gchar dststr[13];
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rec->rec_type = REC_TYPE_PACKET;
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rec->presence_flags = WTAP_HAS_TS|WTAP_HAS_CAP_LEN;
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/* Suppress compiler warnings */
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memset(cap_int, 0, sizeof(cap_int));
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memset(cap_dst, 0, sizeof(cap_dst));
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if (sscanf(line, "%9d.%9d: %15[a-z0-9/:.-](%1[io]) len=%9d:%12s->%12s/",
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&sec, &dsec, cap_int, direction, &pkt_len, cap_src, cap_dst) < 5) {
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*err = WTAP_ERR_BAD_FILE;
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*err_info = g_strdup("netscreen: Can't parse packet-header");
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return -1;
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}
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if (pkt_len < 0) {
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*err = WTAP_ERR_BAD_FILE;
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*err_info = g_strdup("netscreen: packet header has a negative packet length");
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return FALSE;
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}
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if (pkt_len > WTAP_MAX_PACKET_SIZE_STANDARD) {
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/*
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* Probably a corrupt capture file; don't blow up trying
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* to allocate space for an immensely-large packet.
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*/
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*err = WTAP_ERR_BAD_FILE;
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*err_info = g_strdup_printf("netscreen: File has %u-byte packet, bigger than maximum of %u",
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pkt_len, WTAP_MAX_PACKET_SIZE_STANDARD);
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return FALSE;
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}
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/*
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* If direction[0] is 'o', the direction is NETSCREEN_EGRESS,
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* otherwise it's NETSCREEN_INGRESS.
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*/
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rec->ts.secs = sec;
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rec->ts.nsecs = dsec * 100000000;
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rec->rec_header.packet_header.len = pkt_len;
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/* Make sure we have enough room for the packet */
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ws_buffer_assure_space(buf, pkt_len);
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pd = ws_buffer_start_ptr(buf);
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while(1) {
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/* The last packet is not delimited by an empty line, but by EOF
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* So accept EOF as a valid delimiter too
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*/
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if (file_gets(line, NETSCREEN_LINE_LENGTH, fh) == NULL) {
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break;
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}
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/*
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* Skip blanks.
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* The number of blanks is not fixed - for wireless
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* interfaces, there may be 14 extra spaces before
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* the hex data.
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*/
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for (p = &line[0]; g_ascii_isspace(*p); p++)
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;
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/* packets are delimited with empty lines */
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if (*p == '\0') {
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break;
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}
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n = parse_single_hex_dump_line(p, pd, offset);
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/* the smallest packet has a length of 6 bytes, if
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* the first hex-data is less then check whether
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* it is a info-line and act accordingly
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*/
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if (offset == 0 && n < 6) {
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if (info_line(line)) {
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if (++i <= NETSCREEN_MAX_INFOLINES) {
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continue;
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}
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} else {
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*err = WTAP_ERR_BAD_FILE;
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*err_info = g_strdup("netscreen: cannot parse hex-data");
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return FALSE;
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}
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}
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/* If there is no more data and the line was not empty,
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* then there must be an error in the file
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*/
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if (n == -1) {
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*err = WTAP_ERR_BAD_FILE;
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*err_info = g_strdup("netscreen: cannot parse hex-data");
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return FALSE;
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}
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/* Adjust the offset to the data that was just added to the buffer */
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offset += n;
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/* If there was more hex-data than was announced in the len=x
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* header, then then there must be an error in the file
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*/
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if (offset > pkt_len) {
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*err = WTAP_ERR_BAD_FILE;
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*err_info = g_strdup("netscreen: too much hex-data");
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return FALSE;
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}
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}
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/*
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* Determine the encapsulation type, based on the
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* first 4 characters of the interface name
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*
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* XXX convert this to a 'case' structure when adding more
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* (non-ethernet) interfacetypes
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*/
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if (strncmp(cap_int, "adsl", 4) == 0) {
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/* The ADSL interface can be bridged with or without
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* PPP encapsulation. Check whether the first six bytes
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* of the hex data are the same as the destination mac
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* address in the header. If they are, assume ethernet
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* LinkLayer or else PPP
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*/
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g_snprintf(dststr, 13, "%02x%02x%02x%02x%02x%02x",
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pd[0], pd[1], pd[2], pd[3], pd[4], pd[5]);
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if (strncmp(dststr, cap_dst, 12) == 0)
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rec->rec_header.packet_header.pkt_encap = WTAP_ENCAP_ETHERNET;
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else
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rec->rec_header.packet_header.pkt_encap = WTAP_ENCAP_PPP;
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}
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else if (strncmp(cap_int, "seri", 4) == 0)
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rec->rec_header.packet_header.pkt_encap = WTAP_ENCAP_PPP;
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else
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rec->rec_header.packet_header.pkt_encap = WTAP_ENCAP_ETHERNET;
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rec->rec_header.packet_header.caplen = offset;
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return TRUE;
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}
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/* Take a string representing one line from a hex dump, with leading white
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* space removed, and converts the text to binary data. We place the bytes
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* in the buffer at the specified offset.
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*
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* Returns number of bytes successfully read, -1 if bad. */
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static int
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parse_single_hex_dump_line(char* rec, guint8 *buf, guint byte_offset)
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{
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int num_items_scanned;
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guint8 character;
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guint8 byte;
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for (num_items_scanned = 0; num_items_scanned < 16; num_items_scanned++) {
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character = *rec++;
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if (character >= '0' && character <= '9')
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byte = character - '0' + 0;
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else if (character >= 'A' && character <= 'F')
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byte = character - 'A' + 0xA;
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else if (character >= 'a' && character <= 'f')
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byte = character - 'a' + 0xa;
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else if (character == ' ' || character == '\r' || character == '\n' || character == '\0') {
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/* Nothing more to parse */
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break;
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} else
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return -1; /* not a hex digit, space before ASCII dump, or EOL */
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byte <<= 4;
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character = *rec++ & 0xFF;
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if (character >= '0' && character <= '9')
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byte += character - '0' + 0;
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else if (character >= 'A' && character <= 'F')
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byte += character - 'A' + 0xA;
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else if (character >= 'a' && character <= 'f')
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byte += character - 'a' + 0xa;
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else
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return -1; /* not a hex digit */
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buf[byte_offset + num_items_scanned] = byte;
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character = *rec++ & 0xFF;
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if (character == '\0' || character == '\r' || character == '\n') {
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/* Nothing more to parse */
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break;
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} else if (character != ' ') {
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/* not space before ASCII dump */
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return -1;
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}
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}
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if (num_items_scanned == 0)
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return -1;
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return num_items_scanned;
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}
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/*
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* Editor modelines - https://www.wireshark.org/tools/modelines.html
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*
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* Local variables:
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* c-basic-offset: 8
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* tab-width: 8
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* indent-tabs-mode: t
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* End:
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*
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* vi: set shiftwidth=8 tabstop=8 noexpandtab:
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* :indentSize=8:tabSize=8:noTabs=false:
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*/
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