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tshark.c
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tshark.c
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/* tshark.c
*
* Text-mode variant of Wireshark, along the lines of tcpdump and snoop,
* by Gilbert Ramirez <gram@alumni.rice.edu> and Guy Harris <guy@alum.mit.edu>.
*
* $Id$
*
* Wireshark - Network traffic analyzer
* By Gerald Combs <gerald@wireshark.org>
* Copyright 1998 Gerald Combs
*
* This program is free software; you can redistribute it and/or
* modify it under the terms of the GNU General Public License
* as published by the Free Software Foundation; either version 2
* of the License, or (at your option) any later version.
*
* This program is distributed in the hope that it will be useful,
* but WITHOUT ANY WARRANTY; without even the implied warranty of
* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
* GNU General Public License for more details.
*
* You should have received a copy of the GNU General Public License
* along with this program; if not, write to the Free Software
* Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA.
*/
#include "config.h"
#include <stdlib.h>
#include <stdio.h>
#include <string.h>
#include <ctype.h>
#include <locale.h>
#include <limits.h>
#ifdef HAVE_UNISTD_H
#include <unistd.h>
#endif
#ifdef HAVE_GETOPT_H
#include <getopt.h>
#endif
#include <errno.h>
#ifdef HAVE_FCNTL_H
#include <fcntl.h>
#endif
#include <signal.h>
#ifdef HAVE_SYS_STAT_H
# include <sys/stat.h>
#endif
#ifndef HAVE_GETOPT
#include "wsutil/wsgetopt.h"
#endif
#include <glib.h>
#include <epan/epan-int.h>
#include <epan/epan.h>
#include <epan/filesystem.h>
#include <wsutil/crash_info.h>
#include <wsutil/privileges.h>
#include <wsutil/file_util.h>
#include "globals.h"
#include <epan/timestamp.h>
#include <epan/packet.h>
#include "file.h"
#include "frame_tvbuff.h"
#include <epan/disabled_protos.h>
#include <epan/prefs.h>
#include <epan/column.h>
#include <epan/print.h>
#include <epan/addr_resolv.h>
#include "ui/util.h"
#include "clopts_common.h"
#include "cmdarg_err.h"
#include "version_info.h"
#include <epan/plugins.h>
#include "register.h"
#include <epan/epan_dissect.h>
#include <epan/tap.h>
#include <epan/stat_cmd_args.h>
#include <epan/timestamp.h>
#include <epan/ex-opt.h>
#include "capture_opts.h"
#ifdef HAVE_LIBPCAP
#include "capture_ui_utils.h"
#include "capture_ifinfo.h"
#include "capture-pcap-util.h"
#ifdef _WIN32
#include "capture-wpcap.h"
#include <wsutil/unicode-utils.h>
#endif /* _WIN32 */
#include "capture_session.h"
#include "capture_sync.h"
#include "capture_opts.h"
#endif /* HAVE_LIBPCAP */
#include "log.h"
#include <epan/funnel.h>
/*
* This is the template for the decode as option; it is shared between the
* various functions that output the usage for this parameter.
*/
static const gchar decode_as_arg_template[] = "<layer_type>==<selector>,<decode_as_protocol>";
static guint32 cum_bytes;
static const frame_data *ref;
static frame_data ref_frame;
static frame_data *prev_dis;
static frame_data prev_dis_frame;
static frame_data *prev_cap;
static frame_data prev_cap_frame;
static const char* prev_display_dissector_name = NULL;
static gboolean perform_two_pass_analysis;
/*
* The way the packet decode is to be written.
*/
typedef enum {
WRITE_TEXT, /* summary or detail text */
WRITE_XML, /* PDML or PSML */
WRITE_FIELDS /* User defined list of fields */
/* Add CSV and the like here */
} output_action_e;
static output_action_e output_action;
static gboolean do_dissection; /* TRUE if we have to dissect each packet */
static gboolean print_packet_info; /* TRUE if we're to print packet information */
static gint print_summary = -1; /* TRUE if we're to print packet summary information */
static gboolean print_details; /* TRUE if we're to print packet details information */
static gboolean print_hex; /* TRUE if we're to print hex/ascci information */
static gboolean line_buffered;
static gboolean really_quiet = FALSE;
static print_format_e print_format = PR_FMT_TEXT;
static print_stream_t *print_stream;
static output_fields_t* output_fields = NULL;
/* The line separator used between packets, changeable via the -S option */
static const char *separator = "";
#ifdef HAVE_LIBPCAP
/*
* TRUE if we're to print packet counts to keep track of captured packets.
*/
static gboolean print_packet_counts;
static capture_options global_capture_opts;
static capture_session global_capture_session;
#ifdef SIGINFO
static gboolean infodelay; /* if TRUE, don't print capture info in SIGINFO handler */
static gboolean infoprint; /* if TRUE, print capture info after clearing infodelay */
#endif /* SIGINFO */
static gboolean capture(void);
static void report_counts(void);
#ifdef _WIN32
static BOOL WINAPI capture_cleanup(DWORD);
#else /* _WIN32 */
static void capture_cleanup(int);
#ifdef SIGINFO
static void report_counts_siginfo(int);
#endif /* SIGINFO */
#endif /* _WIN32 */
#endif /* HAVE_LIBPCAP */
static int load_cap_file(capture_file *, char *, int, gboolean, int, gint64);
static gboolean process_packet(capture_file *cf, gint64 offset,
struct wtap_pkthdr *whdr, const guchar *pd,
gboolean filtering_tap_listeners, guint tap_flags);
static void show_capture_file_io_error(const char *, int, gboolean);
static void show_print_file_io_error(int err);
static gboolean write_preamble(capture_file *cf);
static gboolean print_packet(capture_file *cf, epan_dissect_t *edt);
static gboolean write_finale(void);
static const char *cf_open_error_message(int err, gchar *err_info,
gboolean for_writing, int file_type);
static void open_failure_message(const char *filename, int err,
gboolean for_writing);
static void failure_message(const char *msg_format, va_list ap);
static void read_failure_message(const char *filename, int err);
static void write_failure_message(const char *filename, int err);
capture_file cfile;
struct string_elem {
const char *sstr; /* The short string */
const char *lstr; /* The long string */
};
static gint
string_compare(gconstpointer a, gconstpointer b)
{
return strcmp(((const struct string_elem *)a)->sstr,
((const struct string_elem *)b)->sstr);
}
static void
string_elem_print(gpointer data, gpointer not_used _U_)
{
fprintf(stderr, " %s - %s\n",
((struct string_elem *)data)->sstr,
((struct string_elem *)data)->lstr);
}
static void
list_capture_types(void) {
int i;
struct string_elem *captypes;
GSList *list = NULL;
captypes = g_new(struct string_elem, WTAP_NUM_FILE_TYPES);
fprintf(stderr, "tshark: The available capture file types for the \"-F\" flag are:\n");
for (i = 0; i < WTAP_NUM_FILE_TYPES; i++) {
if (wtap_dump_can_open(i)) {
captypes[i].sstr = wtap_file_type_short_string(i);
captypes[i].lstr = wtap_file_type_string(i);
list = g_slist_insert_sorted(list, &captypes[i], string_compare);
}
}
g_slist_foreach(list, string_elem_print, NULL);
g_slist_free(list);
g_free(captypes);
}
static void
print_usage(gboolean print_ver)
{
FILE *output;
if (print_ver) {
output = stdout;
fprintf(output,
"TShark " VERSION "%s\n"
"Dump and analyze network traffic.\n"
"See http://www.wireshark.org for more information.\n"
"\n"
"%s",
wireshark_svnversion, get_copyright_info());
} else {
output = stderr;
}
fprintf(output, "\n");
fprintf(output, "Usage: tshark [options] ...\n");
fprintf(output, "\n");
#ifdef HAVE_LIBPCAP
fprintf(output, "Capture interface:\n");
fprintf(output, " -i <interface> name or idx of interface (def: first non-loopback)\n");
fprintf(output, " -f <capture filter> packet filter in libpcap filter syntax\n");
fprintf(output, " -s <snaplen> packet snapshot length (def: 65535)\n");
fprintf(output, " -p don't capture in promiscuous mode\n");
#ifdef HAVE_PCAP_CREATE
fprintf(output, " -I capture in monitor mode, if available\n");
#endif
#if defined(_WIN32) || defined(HAVE_PCAP_CREATE)
fprintf(output, " -B <buffer size> size of kernel buffer (def: %dMB)\n", DEFAULT_CAPTURE_BUFFER_SIZE);
#endif
fprintf(output, " -y <link type> link layer type (def: first appropriate)\n");
fprintf(output, " -D print list of interfaces and exit\n");
fprintf(output, " -L print list of link-layer types of iface and exit\n");
fprintf(output, "\n");
fprintf(output, "Capture stop conditions:\n");
fprintf(output, " -c <packet count> stop after n packets (def: infinite)\n");
fprintf(output, " -a <autostop cond.> ... duration:NUM - stop after NUM seconds\n");
fprintf(output, " filesize:NUM - stop this file after NUM KB\n");
fprintf(output, " files:NUM - stop after NUM files\n");
/*fprintf(output, "\n");*/
fprintf(output, "Capture output:\n");
fprintf(output, " -b <ringbuffer opt.> ... duration:NUM - switch to next file after NUM secs\n");
fprintf(output, " filesize:NUM - switch to next file after NUM KB\n");
fprintf(output, " files:NUM - ringbuffer: replace after NUM files\n");
#endif /* HAVE_LIBPCAP */
#ifdef HAVE_PCAP_REMOTE
fprintf(output, "RPCAP options:\n");
fprintf(output, " -A <user>:<password> use RPCAP password authentication\n");
#endif
/*fprintf(output, "\n");*/
fprintf(output, "Input file:\n");
fprintf(output, " -r <infile> set the filename to read from (no pipes or stdin!)\n");
fprintf(output, "\n");
fprintf(output, "Processing:\n");
fprintf(output, " -2 perform a two-pass analysis\n");
fprintf(output, " -R <read filter> packet Read filter in Wireshark display filter syntax\n");
fprintf(output, " -Y <display filter> packet displaY filter in Wireshark display filter syntax\n");
fprintf(output, " -n disable all name resolutions (def: all enabled)\n");
fprintf(output, " -N <name resolve flags> enable specific name resolution(s): \"mntC\"\n");
fprintf(output, " -d %s ...\n", decode_as_arg_template);
fprintf(output, " \"Decode As\", see the man page for details\n");
fprintf(output, " Example: tcp.port==8888,http\n");
fprintf(output, " -H <hosts file> read a list of entries from a hosts file, which will\n");
fprintf(output, " then be written to a capture file. (Implies -W n)\n");
/*fprintf(output, "\n");*/
fprintf(output, "Output:\n");
fprintf(output, " -w <outfile|-> write packets to a pcap-format file named \"outfile\"\n");
fprintf(output, " (or to the standard output for \"-\")\n");
fprintf(output, " -C <config profile> start with specified configuration profile\n");
fprintf(output, " -F <output file type> set the output file type, default is pcapng\n");
fprintf(output, " an empty \"-F\" option will list the file types\n");
fprintf(output, " -V add output of packet tree (Packet Details)\n");
fprintf(output, " -O <protocols> Only show packet details of these protocols, comma\n");
fprintf(output, " separated\n");
fprintf(output, " -P print packet summary even when writing to a file\n");
fprintf(output, " -S <separator> the line separator to print between packets\n");
fprintf(output, " -x add output of hex and ASCII dump (Packet Bytes)\n");
fprintf(output, " -T pdml|ps|psml|text|fields\n");
fprintf(output, " format of text output (def: text)\n");
fprintf(output, " -e <field> field to print if -Tfields selected (e.g. tcp.port, col.Info);\n");
fprintf(output, " this option can be repeated to print multiple fields\n");
fprintf(output, " -E<fieldsoption>=<value> set options for output when -Tfields selected:\n");
fprintf(output, " header=y|n switch headers on and off\n");
fprintf(output, " separator=/t|/s|<char> select tab, space, printable character as separator\n");
fprintf(output, " occurrence=f|l|a print first, last or all occurrences of each field\n");
fprintf(output, " aggregator=,|/s|<char> select comma, space, printable character as\n");
fprintf(output, " aggregator\n");
fprintf(output, " quote=d|s|n select double, single, no quotes for values\n");
fprintf(output, " -t a|ad|d|dd|e|r|u|ud output format of time stamps (def: r: rel. to first)\n");
fprintf(output, " -u s|hms output format of seconds (def: s: seconds)\n");
fprintf(output, " -l flush standard output after each packet\n");
fprintf(output, " -q be more quiet on stdout (e.g. when using statistics)\n");
fprintf(output, " -Q only log true errors to stderr (quieter than -q)\n");
fprintf(output, " -g enable group read access on the output file(s)\n");
fprintf(output, " -W n Save extra information in the file, if supported.\n");
fprintf(output, " n = write network address resolution information\n");
fprintf(output, " -X <key>:<value> eXtension options, see the man page for details\n");
fprintf(output, " -z <statistics> various statistics, see the man page for details\n");
fprintf(output, " --capture-comment <comment>\n");
fprintf(output, " add a capture comment to the newly created\n");
fprintf(output, " output file (only for pcapng)\n");
fprintf(output, "\n");
fprintf(output, "Miscellaneous:\n");
fprintf(output, " -h display this help and exit\n");
fprintf(output, " -v display version info and exit\n");
fprintf(output, " -o <name>:<value> ... override preference setting\n");
fprintf(output, " -K <keytab> keytab file to use for kerberos decryption\n");
fprintf(output, " -G [report] dump one of several available reports and exit\n");
fprintf(output, " default report=\"fields\"\n");
fprintf(output, " use \"-G ?\" for more help\n");
#ifdef __linux__
fprintf(output, "\n");
fprintf(output, "WARNING: dumpcap will enable kernel BPF JIT compiler if available.\n");
fprintf(output, "You might want to reset it\n");
fprintf(output, "By doing \"echo 0 > /proc/sys/net/core/bpf_jit_enable\"\n");
fprintf(output, "\n");
#endif
}
static void
glossary_option_help(void)
{
FILE *output;
output = stdout;
fprintf(output, "TShark " VERSION "%s\n", wireshark_svnversion);
fprintf(output, "\n");
fprintf(output, "Usage: tshark -G [report]\n");
fprintf(output, "\n");
fprintf(output, "Glossary table reports:\n");
fprintf(output, " -G fields dump fields glossary and exit\n");
fprintf(output, " -G protocols dump protocols in registration database and exit\n");
fprintf(output, " -G values dump value, range, true/false strings and exit\n");
fprintf(output, " -G ftypes dump field type basic and descriptive names\n");
fprintf(output, " -G decodes dump \"layer type\"/\"decode as\" associations and exit\n");
fprintf(output, " -G heuristic-decodes dump heuristic dissector tables\n");
fprintf(output, "\n");
fprintf(output, "Preference reports:\n");
fprintf(output, " -G defaultprefs dump default preferences and exit\n");
fprintf(output, " -G currentprefs dump current preferences and exit\n");
fprintf(output, "\n");
}
/*
* For a dissector table, print on the stream described by output,
* its short name (which is what's used in the "-d" option) and its
* descriptive name.
*/
static void
display_dissector_table_names(const char *table_name, const char *ui_name,
gpointer output)
{
if ((prev_display_dissector_name == NULL) ||
(strcmp(prev_display_dissector_name, table_name) != 0)) {
fprintf((FILE *)output, "\t%s (%s)\n", table_name, ui_name);
prev_display_dissector_name = table_name;
}
}
/*
* For a dissector handle, print on the stream described by output,
* the filter name (which is what's used in the "-d" option) and the full
* name for the protocol that corresponds to this handle.
*/
static void
display_dissector_names(const gchar *table _U_, gpointer handle, gpointer output)
{
int proto_id;
const gchar *proto_filter_name;
const gchar *proto_ui_name;
proto_id = dissector_handle_get_protocol_index((dissector_handle_t)handle);
if (proto_id != -1) {
proto_filter_name = proto_get_protocol_filter_name(proto_id);
proto_ui_name = proto_get_protocol_name(proto_id);
g_assert(proto_filter_name != NULL);
g_assert(proto_ui_name != NULL);
if ((prev_display_dissector_name == NULL) ||
(strcmp(prev_display_dissector_name, proto_filter_name) != 0)) {
fprintf((FILE *)output, "\t%s (%s)\n",
proto_filter_name,
proto_ui_name);
prev_display_dissector_name = proto_filter_name;
}
}
}
/*
* The protocol_name_search structure is used by find_protocol_name_func()
* to pass parameters and store results
*/
struct protocol_name_search{
gchar *searched_name; /* Protocol filter name we are looking for */
dissector_handle_t matched_handle; /* Handle for a dissector whose protocol has the specified filter name */
guint nb_match; /* How many dissectors matched searched_name */
};
typedef struct protocol_name_search *protocol_name_search_t;
/*
* This function parses all dissectors associated with a table to find the
* one whose protocol has the specified filter name. It is called
* as a reference function in a call to dissector_table_foreach_handle.
* The name we are looking for, as well as the results, are stored in the
* protocol_name_search struct pointed to by user_data.
* If called using dissector_table_foreach_handle, we actually parse the
* whole list of dissectors.
*/
static void
find_protocol_name_func(const gchar *table _U_, gpointer handle, gpointer user_data)
{
int proto_id;
const gchar *protocol_filter_name;
protocol_name_search_t search_info;
g_assert(handle);
search_info = (protocol_name_search_t)user_data;
proto_id = dissector_handle_get_protocol_index((dissector_handle_t)handle);
if (proto_id != -1) {
protocol_filter_name = proto_get_protocol_filter_name(proto_id);
g_assert(protocol_filter_name != NULL);
if (strcmp(protocol_filter_name, search_info->searched_name) == 0) {
/* Found a match */
if (search_info->nb_match == 0) {
/* Record this handle only if this is the first match */
search_info->matched_handle = (dissector_handle_t)handle; /* Record the handle for this matching dissector */
}
search_info->nb_match++;
}
}
}
/*
* Allow dissector key names to be sorted alphabetically
*/
static gint
compare_dissector_key_name(gconstpointer dissector_a, gconstpointer dissector_b)
{
return strcmp((const char*)dissector_a, (const char*)dissector_b);
}
/*
* Print all layer type names supported.
* We send the output to the stream described by the handle output.
*/
static void
fprint_all_layer_types(FILE *output)
{
prev_display_dissector_name = NULL;
dissector_all_tables_foreach_table(display_dissector_table_names, (gpointer)output, (GCompareFunc)compare_dissector_key_name);
}
/*
* Print all protocol names supported for a specific layer type.
* table_name contains the layer type name in which the search is performed.
* We send the output to the stream described by the handle output.
*/
static void
fprint_all_protocols_for_layer_types(FILE *output, gchar *table_name)
{
prev_display_dissector_name = NULL;
dissector_table_foreach_handle(table_name,
display_dissector_names,
(gpointer)output);
}
/*
* The function below parses the command-line parameters for the decode as
* feature (a string pointer by cl_param).
* It checks the format of the command-line, searches for a matching table
* and dissector. If a table/dissector match is not found, we display a
* summary of the available tables/dissectors (on stderr) and return FALSE.
* If everything is fine, we get the "Decode as" preference activated,
* then we return TRUE.
*/
static gboolean
add_decode_as(const gchar *cl_param)
{
gchar *table_name;
guint32 selector, selector2;
gchar *decoded_param;
gchar *remaining_param;
gchar *selector_str;
gchar *dissector_str;
dissector_handle_t dissector_matching;
dissector_table_t table_matching;
ftenum_t dissector_table_selector_type;
struct protocol_name_search user_protocol_name;
guint64 i;
char op;
/* The following code will allocate and copy the command-line options in a string pointed by decoded_param */
g_assert(cl_param);
decoded_param = g_strdup(cl_param);
g_assert(decoded_param);
/* The lines below will parse this string (modifying it) to extract all
necessary information. Note that decoded_param is still needed since
strings are not copied - we just save pointers. */
/* This section extracts a layer type (table_name) from decoded_param */
table_name = decoded_param; /* Layer type string starts from beginning */
remaining_param = strchr(table_name, '=');
if (remaining_param == NULL) {
cmdarg_err("Parameter \"%s\" doesn't follow the template \"%s\"", cl_param, decode_as_arg_template);
/* If the argument does not follow the template, carry on anyway to check
if the table name is at least correct. If remaining_param is NULL,
we'll exit anyway further down */
}
else {
*remaining_param = '\0'; /* Terminate the layer type string (table_name) where '=' was detected */
}
/* Remove leading and trailing spaces from the table name */
while ( table_name[0] == ' ' )
table_name++;
while ( table_name[strlen(table_name) - 1] == ' ' )
table_name[strlen(table_name) - 1] = '\0'; /* Note: if empty string, while loop will eventually exit */
/* The following part searches a table matching with the layer type specified */
table_matching = NULL;
/* Look for the requested table */
if ( !(*(table_name)) ) { /* Is the table name empty, if so, don't even search for anything, display a message */
cmdarg_err("No layer type specified"); /* Note, we don't exit here, but table_matching will remain NULL, so we exit below */
}
else {
table_matching = find_dissector_table(table_name);
if (!table_matching) {
cmdarg_err("Unknown layer type -- %s", table_name); /* Note, we don't exit here, but table_matching will remain NULL, so we exit below */
}
}
if (!table_matching) {
/* Display a list of supported layer types to help the user, if the
specified layer type was not found */
cmdarg_err("Valid layer types are:");
fprint_all_layer_types(stderr);
}
if (remaining_param == NULL || !table_matching) {
/* Exit if the layer type was not found, or if no '=' separator was found
(see above) */
g_free(decoded_param);
return FALSE;
}
if (*(remaining_param + 1) != '=') { /* Check for "==" and not only '=' */
cmdarg_err("WARNING: -d requires \"==\" instead of \"=\". Option will be treated as \"%s==%s\"", table_name, remaining_param + 1);
}
else {
remaining_param++; /* Move to the second '=' */
*remaining_param = '\0'; /* Remove the second '=' */
}
remaining_param++; /* Position after the layer type string */
/* This section extracts a selector value (selector_str) from decoded_param */
selector_str = remaining_param; /* Next part starts with the selector number */
remaining_param = strchr(selector_str, ',');
if (remaining_param == NULL) {
cmdarg_err("Parameter \"%s\" doesn't follow the template \"%s\"", cl_param, decode_as_arg_template);
/* If the argument does not follow the template, carry on anyway to check
if the selector value is at least correct. If remaining_param is NULL,
we'll exit anyway further down */
}
else {
*remaining_param = '\0'; /* Terminate the selector number string (selector_str) where ',' was detected */
}
dissector_table_selector_type = get_dissector_table_selector_type(table_name);
switch (dissector_table_selector_type) {
case FT_UINT8:
case FT_UINT16:
case FT_UINT24:
case FT_UINT32:
/* The selector for this table is an unsigned number. Parse it as such.
There's no need to remove leading and trailing spaces from the
selector number string, because sscanf will do that for us. */
switch (sscanf(selector_str, "%u%c%u", &selector, &op, &selector2)) {
case 1:
op = '\0';
break;
case 3:
if (op != ':' && op != '-') {
cmdarg_err("Invalid selector numeric range \"%s\"", selector_str);
g_free(decoded_param);
return FALSE;
}
if (op == ':') {
if ((selector2 == 0) || ((guint64)selector + selector2 - 1) > G_MAXUINT32) {
cmdarg_err("Invalid selector numeric range \"%s\"", selector_str);
g_free(decoded_param);
return FALSE;
}
}
else if (selector2 < selector) {
/* We could swap them for the user, but maybe it's better to call
* this out as an error in case it's not what was intended? */
cmdarg_err("Invalid selector numeric range \"%s\"", selector_str);
g_free(decoded_param);
return FALSE;
}
break;
default:
cmdarg_err("Invalid selector number \"%s\"", selector_str);
g_free(decoded_param);
return FALSE;
}
break;
case FT_STRING:
case FT_STRINGZ:
/* The selector for this table is a string. */
break;
default:
/* There are currently no dissector tables with any types other
than the ones listed above. */
g_assert_not_reached();
}
if (remaining_param == NULL) {
/* Exit if no ',' separator was found (see above) */
cmdarg_err("Valid protocols for layer type \"%s\" are:", table_name);
fprint_all_protocols_for_layer_types(stderr, table_name);
g_free(decoded_param);
return FALSE;
}
remaining_param++; /* Position after the selector number string */
/* This section extracts a protocol filter name (dissector_str) from decoded_param */
dissector_str = remaining_param; /* All the rest of the string is the dissector (decode as protocol) name */
/* Remove leading and trailing spaces from the dissector name */
while ( dissector_str[0] == ' ' )
dissector_str++;
while ( dissector_str[strlen(dissector_str) - 1] == ' ' )
dissector_str[strlen(dissector_str) - 1] = '\0'; /* Note: if empty string, while loop will eventually exit */
dissector_matching = NULL;
/* We now have a pointer to the handle for the requested table inside the variable table_matching */
if ( ! (*dissector_str) ) { /* Is the dissector name empty, if so, don't even search for a matching dissector and display all dissectors found for the selected table */
cmdarg_err("No protocol name specified"); /* Note, we don't exit here, but dissector_matching will remain NULL, so we exit below */
}
else {
user_protocol_name.nb_match = 0;
user_protocol_name.searched_name = dissector_str;
user_protocol_name.matched_handle = NULL;
dissector_table_foreach_handle(table_name, find_protocol_name_func, &user_protocol_name); /* Go and perform the search for this dissector in the this table's dissectors' names and shortnames */
if (user_protocol_name.nb_match != 0) {
dissector_matching = user_protocol_name.matched_handle;
if (user_protocol_name.nb_match > 1) {
cmdarg_err("WARNING: Protocol \"%s\" matched %u dissectors, first one will be used", dissector_str, user_protocol_name.nb_match);
}
}
else {
/* OK, check whether the problem is that there isn't any such
protocol, or that there is but it's not specified as a protocol
that's valid for that dissector table.
Note, we don't exit here, but dissector_matching will remain NULL,
so we exit below */
if (proto_get_id_by_filter_name(dissector_str) == -1) {
/* No such protocol */
cmdarg_err("Unknown protocol -- \"%s\"", dissector_str);
} else {
cmdarg_err("Protocol \"%s\" isn't valid for layer type \"%s\"",
dissector_str, table_name);
}
}
}
if (!dissector_matching) {
cmdarg_err("Valid protocols for layer type \"%s\" are:", table_name);
fprint_all_protocols_for_layer_types(stderr, table_name);
g_free(decoded_param);
return FALSE;
}
/* This is the end of the code that parses the command-line options.
All information is now stored in the variables:
table_name
selector
dissector_matching
The above variables that are strings are still pointing to areas within
decoded_parm. decoded_parm thus still needs to be kept allocated in
until we stop needing these variables
decoded_param will be deallocated at each exit point of this function */
/* We now have a pointer to the handle for the requested dissector
(requested protocol) inside the variable dissector_matching */
switch (dissector_table_selector_type) {
case FT_UINT8:
case FT_UINT16:
case FT_UINT24:
case FT_UINT32:
/* The selector for this table is an unsigned number. */
if (op == '\0') {
dissector_change_uint(table_name, selector, dissector_matching);
} else if (op == ':') {
for (i = selector; i < (guint64)selector + selector2; i++) {
dissector_change_uint(table_name, (guint32)i, dissector_matching);
}
} else { /* op == '-' */
for (i = selector; i <= selector2; i++) {
dissector_change_uint(table_name, (guint32)i, dissector_matching);
}
}
break;
case FT_STRING:
case FT_STRINGZ:
/* The selector for this table is a string. */
dissector_change_string(table_name, selector_str, dissector_matching);
break;
default:
/* There are currently no dissector tables with any types other
than the ones listed above. */
g_assert_not_reached();
}
g_free(decoded_param); /* "Decode As" rule has been successfully added */
return TRUE;
}
static void
tshark_log_handler (const gchar *log_domain, GLogLevelFlags log_level,
const gchar *message, gpointer user_data)
{
/* ignore log message, if log_level isn't interesting based
upon the console log preferences.
If the preferences haven't been loaded loaded yet, display the
message anyway.
The default console_log_level preference value is such that only
ERROR, CRITICAL and WARNING level messages are processed;
MESSAGE, INFO and DEBUG level messages are ignored.
XXX: Aug 07, 2009: Prior tshark g_log code was hardwired to process only
ERROR and CRITICAL level messages so the current code is a behavioral
change. The current behavior is the same as in Wireshark.
*/
if ((log_level & G_LOG_LEVEL_MASK & prefs.console_log_level) == 0 &&
prefs.console_log_level != 0) {
return;
}
g_log_default_handler(log_domain, log_level, message, user_data);
}
static char *
output_file_description(const char *fname)
{
char *save_file_string;
/* Get a string that describes what we're writing to */
if (strcmp(fname, "-") == 0) {
/* We're writing to the standard output */
save_file_string = g_strdup("standard output");
} else {
/* We're writing to a file with the name in save_file */
save_file_string = g_strdup_printf("file \"%s\"", fname);
}
return save_file_string;
}
static void
print_current_user(void) {
gchar *cur_user, *cur_group;
if (started_with_special_privs()) {
cur_user = get_cur_username();
cur_group = get_cur_groupname();
fprintf(stderr, "Running as user \"%s\" and group \"%s\".",
cur_user, cur_group);
g_free(cur_user);
g_free(cur_group);
if (running_with_special_privs()) {
fprintf(stderr, " This could be dangerous.");
}
fprintf(stderr, "\n");
}
}
static void
check_capture_privs(void) {
#ifdef _WIN32
load_wpcap();
/* Warn the user if npf.sys isn't loaded. */
if (!npf_sys_is_running() && get_os_major_version() >= 6) {
fprintf(stderr, "The NPF driver isn't running. You may have trouble "
"capturing or\nlisting interfaces.\n");
}
#endif
}
static void
show_version(GString *comp_info_str, GString *runtime_info_str)
{
printf("TShark " VERSION "%s\n"
"\n"
"%s"
"\n"
"%s"
"\n"
"%s",
wireshark_svnversion, get_copyright_info(), comp_info_str->str,
runtime_info_str->str);
}
int
main(int argc, char *argv[])
{
GString *comp_info_str;
GString *runtime_info_str;
char *init_progfile_dir_error;
int opt;
struct option long_options[] = {
{(char *)"capture-comment", required_argument, NULL, LONGOPT_NUM_CAP_COMMENT },
{0, 0, 0, 0 }
};
gboolean arg_error = FALSE;
#ifdef _WIN32
WSADATA wsaData;
#endif /* _WIN32 */
char *gpf_path, *pf_path;
char *gdp_path, *dp_path;
int gpf_open_errno, gpf_read_errno;
int pf_open_errno, pf_read_errno;
int gdp_open_errno, gdp_read_errno;
int dp_open_errno, dp_read_errno;
int err;
volatile int exit_status = 0;
#ifdef HAVE_LIBPCAP
gboolean list_link_layer_types = FALSE;
gboolean start_capture = FALSE;
int status;
GList *if_list;
gchar *err_str;
#else
gboolean capture_option_specified = FALSE;
#endif
gboolean quiet = FALSE;
#ifdef PCAP_NG_DEFAULT
volatile int out_file_type = WTAP_FILE_PCAPNG;
#else
volatile int out_file_type = WTAP_FILE_PCAP;
#endif
volatile gboolean out_file_name_res = FALSE;
gchar *volatile cf_name = NULL;
gchar *rfilter = NULL;
gchar *dfilter = NULL;
#ifdef HAVE_PCAP_OPEN_DEAD
struct bpf_program fcode;
#endif
dfilter_t *rfcode = NULL;
dfilter_t *dfcode = NULL;
e_prefs *prefs_p;
char badopt;
int log_flags;
int optind_initial;
gchar *output_only = NULL;
#ifdef HAVE_PCAP_REMOTE
#define OPTSTRING_A "A:"
#else
#define OPTSTRING_A ""
#endif
#ifdef HAVE_LIBPCAP
#if defined(_WIN32) || defined(HAVE_PCAP_CREATE)
#define OPTSTRING_B "B:"
#else
#define OPTSTRING_B ""
#endif /* _WIN32 or HAVE_PCAP_CREATE */
#else /* HAVE_LIBPCAP */
#define OPTSTRING_B ""
#endif /* HAVE_LIBPCAP */
#ifdef HAVE_PCAP_CREATE
#define OPTSTRING_I "I"
#else
#define OPTSTRING_I ""
#endif
/* the leading - ensures that getopt() does not permute the argv[] entries
we have to make sure that the first getopt() preserves the content of argv[]
for the subsequent getopt_long() call */
#define OPTSTRING "-2a:" OPTSTRING_A "b:" OPTSTRING_B "c:C:d:De:E:f:F:gG:hH:i:" OPTSTRING_I "K:lLnN:o:O:pPqQr:R:s:S:t:T:u:vVw:W:xX:y:Y:z:"
static const char optstring[] = OPTSTRING;
/* Assemble the compile-time version information string */
comp_info_str = g_string_new("Compiled ");
get_compiled_version_info(comp_info_str, NULL, epan_get_compiled_version_info);
/* Assemble the run-time version information string */
runtime_info_str = g_string_new("Running ");
get_runtime_version_info(runtime_info_str, NULL);
/* Add it to the information to be reported on a crash. */
ws_add_crash_info("TShark " VERSION "%s\n"
"\n"
"%s"
"\n"
"%s",
wireshark_svnversion, comp_info_str->str, runtime_info_str->str);
#ifdef _WIN32
arg_list_utf_16to8(argc, argv);
create_app_running_mutex();
#if !GLIB_CHECK_VERSION(2,31,0)
g_thread_init(NULL);
#endif
#endif /* _WIN32 */
/*
* Get credential information for later use.
*/
init_process_policies();
/*
* Attempt to get the pathname of the executable file.
*/
init_progfile_dir_error = init_progfile_dir(argv[0], main);
if (init_progfile_dir_error != NULL) {
fprintf(stderr, "tshark: Can't get pathname of tshark program: %s.\n",
init_progfile_dir_error);
}