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Give Tethereal a "-D" flag, inspired by WinPcap's "-D" flag, which 

prints a list of all network interfaces it found on which it can capture
(the same list as the one that shows up in the "Interface" combo box in
Ethereal's "Capture Preferences" dialog).

svn path=/trunk/; revision=3194
This commit is contained in:
Guy Harris 2001-03-27 06:16:11 +00:00
parent 7d274106ec
commit 40ba2e9e61
2 changed files with 35 additions and 3 deletions
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10
doc/tethereal.pod.template
View File

@ -7,6 +7,7 @@ Tethereal - Dump and analyze network traffic
B<tethereal>
S<[ B<-c> count ]>
S<[ B<-D> ]>
S<[ B<-f> capture filter expression ]>
S<[ B<-F> file format ]>
S<[ B<-h> ]>
@ -108,6 +109,15 @@ B<-r> flag was specified).
Sets the default number of packets to read when capturing live
data.
=item -D
Prints a list of the interfaces on which B<Tethereal> can capture, and
exits. Note that "can capture" means that B<Tethereal> was able to open
that device to do a live capture; if, on your system, a program doing a
network capture must be run from an account with special privileges (for
example, as root), then, if B<Tethereal> is run with the B<-D> flag and
is not run from such an account, it will not list any interfaces.
=item -f
Sets the capture filter expression.

28
tethereal.c
View File

@ -1,6 +1,6 @@
/* tethereal.c
*
* $Id: tethereal.c,v 1.70 2001/03/24 09:24:41 guy Exp $
* $Id: tethereal.c,v 1.71 2001/03/27 06:16:10 guy Exp $
*
* Ethereal - Network traffic analyzer
* By Gerald Combs <gerald@zing.org>
@ -145,7 +145,7 @@ print_usage(void)
fprintf(stderr, "This is GNU t%s %s, compiled with %s\n", PACKAGE,
VERSION, comp_info_str);
#ifdef HAVE_LIBPCAP
fprintf(stderr, "t%s [ -vVhlp ] [ -c count ] [ -f <capture filter> ]\n", PACKAGE);
fprintf(stderr, "t%s [ -DvVhlp ] [ -c count ] [ -f <capture filter> ]\n", PACKAGE);
fprintf(stderr, "\t[ -F <capture file type> ] [ -i interface ] [ -n ]\n");
fprintf(stderr, "\t[ -o <preference setting> ] ... [ -r infile ] [ -R <read filter> ]\n");
fprintf(stderr, "\t[ -s snaplen ] [ -t <time stamp format> ] [ -w savefile ] [ -x ]\n");
@ -187,7 +187,7 @@ main(int argc, char *argv[])
#ifdef HAVE_LIBPCAP
gboolean capture_filter_specified = FALSE;
int packet_count = 0;
GList *if_list;
GList *if_list, *if_entry;
gchar err_str[PCAP_ERRBUF_SIZE];
#else
gboolean capture_option_specified = FALSE;
@ -304,6 +304,28 @@ main(int argc, char *argv[])
arg_error = TRUE;
#endif
break;
case 'D': /* Print a list of capture devices */
if_list = get_interface_list(&err, err_str);
if (if_list == NULL) {
switch (err) {
case CANT_GET_INTERFACE_LIST:
fprintf(stderr, "tethereal: Can't get list of interfaces: %s\n",
err_str);
break;
case NO_INTERFACES_FOUND:
fprintf(stderr, "tethereal: There are no interfaces on which a capture can be done\n");
break;
}
exit(2);
}
for (if_entry = g_list_first(if_list); if_entry != NULL;
if_entry = g_list_next(if_entry))
printf("%s\n", (char *)if_entry->data);
free_interface_list(if_list);
exit(0);
break;
case 'f':
#ifdef HAVE_LIBPCAP
capture_filter_specified = TRUE;