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From: Ngie Cooper <ngie@FreeBSD.org>
Date: Fri, 23 Dec 2016 05:07:29 +0000 (UTC)
To: src-committers@freebsd.org, svn-src-all@freebsd.org,
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Subject: svn commit: r310455 - head/contrib/bsnmp/snmpd
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Author: ngie
Date: Fri Dec 23 05:07:28 2016
New Revision: 310455
URL: https://svnweb.freebsd.org/changeset/base/310455

Log:
  Clarify failure in snmp_output(..) with call to snmp_pdu_decode
  
  - Explicitly test snmp_pdu_encode against SNMP_CODE_OK instead of assuming
    any non-zero value is bad.
  - Print out the code before calling abort() to give the end-user something
    actionable to debug without having to recompile the binary, since the
    core might not have these details.
  
  MFC after:	1 week

Modified:
  head/contrib/bsnmp/snmpd/main.c

Modified: head/contrib/bsnmp/snmpd/main.c
==============================================================================
--- head/contrib/bsnmp/snmpd/main.c	Fri Dec 23 05:02:17 2016	(r310454)
+++ head/contrib/bsnmp/snmpd/main.c	Fri Dec 23 05:07:28 2016	(r310455)
@@ -282,12 +282,13 @@ snmp_output(struct snmp_pdu *pdu, u_char
     const char *dest)
 {
 	struct asn_buf resp_b;
+	enum snmp_code code;
 
 	resp_b.asn_ptr = sndbuf;
 	resp_b.asn_len = snmpd.txbuf;
 
-	if (snmp_pdu_encode(pdu, &resp_b) != 0) {
-		syslog(LOG_ERR, "cannot encode message");
+	if ((code = snmp_pdu_encode(pdu, &resp_b)) != SNMP_CODE_OK) {
+		syslog(LOG_ERR, "cannot encode message (code=%d)", code);
 		abort();
 	}
 	if (debug.dump_pdus) {