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, 6 insertions, 0 deletions

diff --git a/ChangeLog b/ChangeLog
index 91b76c3..1dd5dcc 100644
--- a/ChangeLog
+++ b/ChangeLog
@@ -1,3 +1,9 @@
+	* Interfaces with a callsign without SSID were not been found anymore
+	  after the last patch below. See cvs comment for detail.
+          Affected files: axconfig.c, nrconfig.c and procutils.c.
+
+ -- Thomas Osterried DL9SAU <ax25@x-berg.in-berlin.de> Wed, 01 Feb 2012 00:10:45 +0100
+
 	* ax25_ntoa() does no longer print a zero SSID.  This avoids addresses
 	  like AB3DEF-0 which is general convention anyway.