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Add dumpcap options to set the name and description for a capture source. 

Add --ifname and --ifdescr to allow the name and description for an
interface or pipe to be set; this overrides the specified name or
reported description for an interface, and overrides the pipe path name
and provides a description for a pipe.

Provide those arguments when capturing from an extcap program.

This is mainly for extcaps, so you have something more meaningful than
some random path name as the interface name and something descriptive
for the description.
pespin/rlcmac
Guy Harris 2021-03-24 23:36:29 -07:00
parent ecad065809
commit d18e1f19e9
5 changed files with 78 additions and 2 deletions
Show Stats Download Patch File Download Diff File Expand all files Collapse all files

9
capchild/capture_sync.c
View File

@ -342,6 +342,15 @@ sync_pipe_start(capture_options *capture_opts, capture_session *cap_session, inf
#else
argv = sync_pipe_add_arg(argv, &argc, interface_opts->extcap_fifo);
#endif
/* Add a name for the interface, to put into an IDB. */
argv = sync_pipe_add_arg(argv, &argc, "--ifname");
argv = sync_pipe_add_arg(argv, &argc, interface_opts->name);
if (interface_opts->descr != NULL)
{
/* Add a description for the interface, to put into an IDB. */
argv = sync_pipe_add_arg(argv, &argc, "--ifdescr");
argv = sync_pipe_add_arg(argv, &argc, interface_opts->descr);
}
}
else
argv = sync_pipe_add_arg(argv, &argc, interface_opts->name);

3
capture_opts.c
View File

@ -563,6 +563,7 @@ fill_in_interface_opts_from_ifinfo(interface_options *interface_opts,
interface_opts->descr = NULL;
interface_opts->display_name = g_strdup(if_info->name);
}
interface_opts->ifname = NULL;
interface_opts->if_type = if_info->type;
interface_opts->extcap = g_strdup(if_info->extcap);
}
@ -740,6 +741,7 @@ capture_opts_add_iface_opt(capture_options *capture_opts, const char *optarg_str
interface_opts.descr = NULL;
interface_opts.hardware = NULL;
interface_opts.display_name = g_strdup(optarg_str_p);
interface_opts.ifname = NULL;
interface_opts.if_type = capture_opts->default_options.if_type;
interface_opts.extcap = g_strdup(capture_opts->default_options.extcap);
}
@ -1206,6 +1208,7 @@ capture_opts_del_iface(capture_options *capture_opts, guint if_index)
g_free(interface_opts->descr);
g_free(interface_opts->hardware);
g_free(interface_opts->display_name);
g_free(interface_opts->ifname);
g_free(interface_opts->cfilter);
g_free(interface_opts->timestamp_type);
g_free(interface_opts->extcap);

1
capture_opts.h
View File

@ -197,6 +197,7 @@ typedef struct interface_options_tag {
gchar *descr; /* a more user-friendly description of the interface; may be NULL if none */
gchar *hardware; /* description of the hardware */
gchar *display_name; /* the name displayed in the console and title bar */
gchar *ifname; /* if not null, name to use instead of the interface naem in IDBs */
gchar *cfilter;
gboolean has_snaplen;
int snaplen;

12
doc/dumpcap.pod
View File

@ -29,6 +29,8 @@ S<[ B<-M> ]>
S<[ B<-n> ]>
S<[ B<-N> E<lt>packet limitE<gt> ]>
S<[ B<-p>|B<--no-promiscuous-mode> ]>
S<[ B<--ifdescr> E<lt>descriptionE<gt> ]>
S<[ B<--ifname> E<lt>nameE<gt> ]>
S<[ B<-P> ]>
S<[ B<-q> ]>
S<[ B<-s>|B<--snapshot-length> E<lt>capture snaplenE<gt> ]>
@ -248,6 +250,16 @@ endianness as the capturing host.
This option can occur multiple times. When capturing from multiple
interfaces, the capture file will be saved in pcapng format.
=item --ifdescr> E<lt>descriptionE<gt>
Use I<description> as the description in the capture file for the
interface or pipe specified before it with B<-i>.
=item --ifname> E<lt>nameE<gt>
Use I<name> as the name in the capture file for the the interface or
pipe specified before it with B<-i>.
=item -I|--monitor-mode
Put the interface in "monitor mode"; this is supported only on IEEE

55
dumpcap.c
View File

@ -367,6 +367,11 @@ print_usage(FILE *output)
" or for remote capturing, use one of these formats:\n"
" rpcap://<host>/<interface>\n"
" TCP@<host>:<port>\n");
fprintf(output, " --ifname <name> name to use in the capture file for a pipe from which\n");
fprintf(output, " we're capturing\n");
fprintf(output, " --ifdescr <description>\n");
fprintf(output, " description to use in the capture file for a pipe\n");
fprintf(output, " from which we're capturing\n");
fprintf(output, " -f <capture filter> packet filter in libpcap filter syntax\n");
fprintf(output, " -s <snaplen>, --snapshot-length <snaplen>\n");
#ifdef HAVE_PCAP_CREATE
@ -3146,8 +3151,8 @@ capture_loop_init_pcapng_output(capture_options *capture_opts, loop_data *ld,
pcap_src->snaplen = pcap_snapshot(pcap_src->pcap_h);
}
successful = pcapng_write_interface_description_block(global_ld.pdh,
NULL, /* OPT_COMMENT 1 */
interface_opts->name, /* IDB_NAME 2 */
NULL, /* OPT_COMMENT 1 */
(interface_opts->ifname != NULL) ? interface_opts->ifname : interface_opts->name, /* IDB_NAME 2 */
interface_opts->descr, /* IDB_DESCRIPTION 3 */
interface_opts->cfilter, /* IDB_FILTER 11 */
os_info_str->str, /* IDB_OS 12 */
@ -4820,6 +4825,9 @@ get_dumpcap_runtime_info(GString *str)
get_runtime_caplibs_version(str);
}
#define LONGOPT_IFNAME LONGOPT_BASE_APPLICATION+1
#define LONGOPT_IFDESCR LONGOPT_BASE_APPLICATION+2
/* And now our feature presentation... [ fade to music ] */
int
main(int argc, char *argv[])
@ -4830,6 +4838,8 @@ main(int argc, char *argv[])
{"help", no_argument, NULL, 'h'},
{"version", no_argument, NULL, 'v'},
LONGOPT_CAPTURE_COMMON
{"ifname", required_argument, NULL, LONGOPT_IFNAME},
{"ifdescr", required_argument, NULL, LONGOPT_IFDESCR},
{0, 0, 0, 0 }
};
@ -5190,6 +5200,28 @@ main(int argc, char *argv[])
}
break;
/*** hidden option: Wireshark child mode (using binary output messages) ***/
case LONGOPT_IFNAME:
if (global_capture_opts.ifaces->len > 0) {
interface_options *interface_opts;
interface_opts = &g_array_index(global_capture_opts.ifaces, interface_options, global_capture_opts.ifaces->len - 1);
interface_opts->ifname = g_strdup(optarg);
} else {
cmdarg_err("--ifname must be specified after a -i option");
exit_main(1);
}
break;
case LONGOPT_IFDESCR:
if (global_capture_opts.ifaces->len > 0) {
interface_options *interface_opts;
interface_opts = &g_array_index(global_capture_opts.ifaces, interface_options, global_capture_opts.ifaces->len - 1);
interface_opts->descr = g_strdup(optarg);
} else {
cmdarg_err("--ifdescr must be specified after a -i option");
exit_main(1);
}
break;
case 'Z':
capture_child = TRUE;
#ifdef _WIN32
@ -5530,6 +5562,25 @@ main(int argc, char *argv[])
g_string_append_printf(str, "and ");
}
}
if (interface_opts->ifname != NULL) {
/*
* Re-generate the display name based on the strins
* we were handed.
*/
g_free(interface_opts->display_name);
if (interface_opts->descr != NULL) {
#ifdef _WIN32
interface_opts->display_name = g_strdup_printf("%s",
interface_opts->descr);
#else
interface_opts->display_name = g_strdup_printf("%s: %s",
interface_opts->descr, interface_opts->ifname);
#endif
} else {
interface_opts->display_name = g_strdup_printf("%s",
interface_opts->ifname);
}
}
g_string_append_printf(str, "'%s'", interface_opts->display_name);
}
} else {