Fixed Bug: libax25 cannot find interfaces with callsign's without SSID.

In http://www.linux-ax25.org/cvsweb/libax25/ChangeLog we read:

	Revision 1.8: download - view: text, markup, annotated - select for diffs
	Thu Sep 10 16:53:28 2009 UTC (2 years, 4 months ago) by ralf
	Branches: MAIN
	CVS tags: HEAD
	Diff to: previous 1.7: preferred, colored
	Changes since revision 1.7: +5 -0 lines
	ax25_ntoa: Don't emit SSID suffix if the SSID is zero.

	From: Matti Aarnio OH2MQK <matti.aarnio@zmailer.org>

In http://www.linux-ax25.org/cvsweb/libax25/axutils.c.diff?r1=1.4;r2=1.5
funtion char *ax25_ntoa(const ax25_address *a):

-	*s++ = '-';
+	/* Convention is:  -0 suffixes are NOT printed */
+	if (a->ax25_call[6] & 0x1E) {
+	       *s++ = '-';

-	if ((n = ((a->ax25_call[6] >> 1) & 0x0F)) > 9) {
-		*s++ = '1';
-		n -= 10;
+		if ((n = ((a->ax25_call[6] >> 1) & 0x0F)) > 9) {
+			*s++ = '1';
+			n -= 10;
+		}
+		*s++ = n + '0';
 	}
-
-	*s++ = n + '0';
+
 	*s++ = '\0';


This is diametral to the previous situation, where ax25_ntoa always returned
a call with SSID.

Unfortunately, that patch broke a fixe introduced in April 2009; that patch
fixed the same issue introduced by a patch in April 2008:

http://www.linux-ax25.org/cvsweb/libax25/axconfig.c
        This is a fix for a bug introduced 2008-04-02, which caused interfaces
        containing CALL without SSID not being found anymore (user had to
        address CALL-0 instead of just CALL).

  http://www.linux-ax25.org/cvsweb/libax25/axconfig.c.diff?r1=1.7;r2=1.8

  [..]
+        /* user may have configured "DL9SAU". But we compare to *ifcalls,
+         * which comes from ifr_hwaddr.sa_data and it always contains a SSID;
+         * in this case, "DL9SAU-0". This fixes a bug introduced 2008-04-02,
+         * which caused interfaces without SSID not being found anymore. :(
+         */
  [..]


It has been overseen that libax25 internaly uses ax25_ntoa, not just for
user-presentation.

The fix today resolves the problem, and cleans up helper routines like
strip_zero_ssid() that are no longer needed.

Affected files: axconfig.c, nrconfig.c and procutils.c.

1 files changed, 4 insertions, 6 deletions

diff --git a/nrconfig.c b/nrconfig.c
index 1aa0d12..894ae41 100644
--- a/nrconfig.c
+++ b/nrconfig.c
@@ -179,7 +179,6 @@ static int nr_config_init_port(int fd, int lineno, char *line, const char **ifca
 	char *name, *call, *alias, *paclen, *desc;
 	const char *dev = NULL;
 	int found = 0;
-	char call_beautified[10];
 	
 	name   = strtok(line, " \t");
 	call   = strtok(NULL, " \t");
@@ -216,14 +215,13 @@ static int nr_config_init_port(int fd, int lineno, char *line, const char **ifca
 	strupr(call);
 	strupr(alias);
 
-	strncpy(call_beautified, call, sizeof(call_beautified)-1);
-        call_beautified[sizeof(call_beautified)-1] = 0;
-	if (strchr(call_beautified, '-') == NULL && strlen(call_beautified) < 7)
-		strcat(call_beautified, "-0");
+	char *cp;
+	if ((cp = strstr(call, "-0")) != NULL)
+	  *cp = 0;
 
 	found = 0;
 	for (;ifcalls && *ifcalls; ++ifcalls, ++ifdevs) {
-	  if (strcmp(call_beautified, *ifcalls) == 0) {
+	  if (strcmp(call, *ifcalls) == 0) {
 	    found = 1;
 	    dev = *ifdevs;
 	    break;