In Tethereal, allow capture filters and read filters either to be

specifies with "-f" and "-R" flags, respectively, or specified with
non-flag command-line arguments, as tcpdump and snoop allow.

svn path=/trunk/; revision=1663

doc/tethereal.pod.template

@@ -19,8 +19,9 @@ S<[ B<-s> snaplen ]>
 S<[ B<-t> time stamp format ]>
 S<[ B<-v> ]>
 S<[ B<-V> ]>
-S<[ B<-w> savefile]>
+S<[ B<-w> savefile ]>
 S<[ B<-x> ]>
+S<[ filter expression ]>
 
 =head1 DESCRIPTION
 
@@ -83,6 +84,13 @@ Compressed file support uses (and therefore requires) the zlib library.
 If the zlib library is not present, B<Tethereal> will compile, but will
 be unable to read compressed files.
 
+A capture or read filter can either be specified with the B<-f> or B<-R>
+option, respectively, in which case the entire filter expression must be
+specified as a single argument (which means that if it contains spaces,
+it must be quoted), or can be specified with command-line arguments
+after the option arguments, in which case all the arguments after the
+filter arguments are treated as a filter expression.
+
 =head1 OPTIONS
 
 =over 4

tethereal.c

@@ -1,6 +1,6 @@
 /* tethereal.c
  *
- * $Id: tethereal.c,v 1.19 2000/02/19 07:59:54 guy Exp $
+ * $Id: tethereal.c,v 1.20 2000/02/22 07:07:46 guy Exp $
  *
  * Ethereal - Network traffic analyzer
  * By Gerald Combs <gerald@zing.org>
@@ -174,6 +174,7 @@ main(int argc, char *argv[])
   char                *pf_path;
   int                  err;
 #ifdef HAVE_LIBPCAP
+  gboolean             capture_filter_specified = FALSE;
   int                  packet_count = 0;
   GList               *if_list;
   gchar                err_str[PCAP_ERRBUF_SIZE];
@@ -287,6 +288,7 @@ main(int argc, char *argv[])
 	break;
       case 'f':
 #ifdef HAVE_LIBPCAP
+        capture_filter_specified = TRUE;
 	cf.cfilter = g_strdup(optarg);
 #else
         capture_option_specified = TRUE;
@@ -361,6 +363,32 @@ main(int argc, char *argv[])
     }
   }
   
+  /* If no capture filter or read filter has been specified, and there are
+     still command-line arguments, treat them as the tokens of a capture
+     filter (if no "-r" flag was specified) or a read filter (if a "-r"
+     flag was specified. */
+  if (optind < argc) {
+    if (cf_name != NULL) {
+      if (rfilter != NULL) {
+        fprintf(stderr,
+"tethereal: Read filters were specified both with \"-R\" and with additional command-line arguments\n");
+        exit(2);
+      }
+      rfilter = get_args_as_string(argc, argv, optind);
+    } else {
+#ifdef HAVE_LIBPCAP
+      if (capture_filter_specified) {
+        fprintf(stderr,
+"tethereal: Capture filters were specified both with \"-f\" and with additional command-line arguments\n");
+        exit(2);
+      }
+      cf.cfilter = get_args_as_string(argc, argv, optind);
+#else
+      capture_option_specified = TRUE;
+#endif
+    }
+  }
+
 #ifndef HAVE_LIBPCAP
   if (capture_option_specified)
     fprintf(stderr, "This version of Tethereal was not built with support for capturing packets.\n");

util.c

@@ -1,7 +1,7 @@
 /* util.c
  * Utility routines
  *
- * $Id: util.c,v 1.36 2000/02/09 19:17:52 gram Exp $
+ * $Id: util.c,v 1.37 2000/02/22 07:07:46 guy Exp $
  *
  * Ethereal - Network traffic analyzer
  * By Gerald Combs <gerald@zing.org>
@@ -183,6 +183,46 @@ get_dirname(char *path)
 	return path;
 }
 
+/*
+ * Collect command-line arguments as a string consisting of the arguments,
+ * separated by spaces.
+ */
+char *
+get_args_as_string(int argc, char **argv, int optind)
+{
+	int len;
+	int i;
+	char *argstring;
+
+	/*
+	 * Find out how long the string will be.
+	 */
+	len = 0;
+	for (i = optind; i < argc; i++) {
+		len += strlen(argv[i]);
+		len++;	/* space, or '\0' if this is the last argument */
+	}
+
+	/*
+	 * Allocate the buffer for the string.
+	 */
+	argstring = g_malloc(len);
+
+	/*
+	 * Now construct the string.
+	 */
+	strcpy(argstring, "");
+	i = optind;
+	for (;;) {
+		strcat(argstring, argv[i]);
+		i++;
+		if (i == argc)
+			break;
+		strcat(argstring, " ");
+	}
+	return argstring;
+}
+
 static char *
 setup_tmpdir(char *dir)
 {

util.h

@@ -1,7 +1,7 @@
 /* util.h
  * Utility definitions
  *
- * $Id: util.h,v 1.18 2000/01/29 16:41:15 gram Exp $
+ * $Id: util.h,v 1.19 2000/02/22 07:07:47 guy Exp $
  *
  * Ethereal - Network traffic analyzer
  * By Gerald Combs <gerald@zing.org>
@@ -48,6 +48,12 @@ int create_tempfile(char *, int, const char *);
  * variable, or a default directory if HOME is not set */
 const char* get_home_dir(void);
 
+/*
+ * Collect command-line arguments as a string consisting of the arguments,
+ * separated by spaces.
+ */
+char *get_args_as_string(int argc, char **argv, int optind);
+
 void ASCII_to_EBCDIC(guint8 *buf, guint bytes);
 guint8 ASCII_to_EBCDIC1(guint8 c);
 void EBCDIC_to_ASCII(guint8 *buf, guint bytes);