svn commit: r310498 - head/contrib/bsnmp/snmpd

[Ngie Cooper]

Author: ngie
Date: Sat Dec 24 11:23:18 2016
New Revision: 310498
URL: https://svnweb.freebsd.org/changeset/base/310498

Log:
  Allow SNMPv3 authNoPriv and noAuthNoPriv protocols to discover snmpEngineTime
  as discussed in RFC-5343
  
  This fixes interoperability with net-snmp.
  
  Tested with the following invocations of snmpwalk (from net-snmp):
  
  - noAuthNoPriv:
  
    % snmpwalk -v 3 -n '' -u public localhost snmpEngineTime
  
  - authNoPriv:
  
    % snmpwalk -v 3 -n '' -u bsnmp -A bsnmptest -l authNoPriv -a sha localhost \
      localhost snmpEngineTime
  
  - authPriv:
  
    % snmpwalk -v 3 -n '' -u bsnmp -A bsnmptest -l authPriv -a sha -x des \
      -X bsnmptest localhost snmpEngineTime
  
  MFC after:	1 week
  Obtained from:	Isilon OneFS (5ec6d772cacbc, with minor tweaks)
  Submitted by:	Austin Voecks <austin.voecks at isilon.com>
  Sponsored by:	Dell EMC Isilon

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

Modified: head/contrib/bsnmp/snmpd/action.c
==============================================================================
--- head/contrib/bsnmp/snmpd/action.c	Sat Dec 24 11:22:28 2016	(r310497)
+++ head/contrib/bsnmp/snmpd/action.c	Sat Dec 24 11:23:18 2016	(r310498)
@@ -40,6 +40,7 @@
 #include <sys/utsname.h>
 #include <ctype.h>
 #include <errno.h>
+#include <inttypes.h>
 #include <stdarg.h>
 #include <stdio.h>
 #include <stdlib.h>
@@ -219,6 +220,21 @@ save_boots:
 	return (0);
 }
 
+void
+update_snmpd_engine_time(void)
+{
+	uint64_t etime;
+
+	etime = (get_ticks() - start_tick) / 100ULL;
+	if (etime < INT32_MAX)
+		snmpd_engine.engine_time = etime;
+	else {
+		start_tick = get_ticks();
+		(void)set_snmpd_engine();
+		snmpd_engine.engine_time = start_tick;
+	}
+}
+
 /*************************************************************
  *
  * System group
@@ -1118,7 +1134,7 @@ op_snmp_engine(struct snmp_context *ctx 
 		value->v.integer = snmpd_engine.engine_boots;
 		break;
 	case LEAF_snmpEngineTime:
-		snmpd_engine.engine_time = (get_ticks() - start_tick) / 100ULL;
+		update_snmpd_engine_time();
 		value->v.integer = snmpd_engine.engine_time;
 		break;
 	case LEAF_snmpEngineMaxMessageSize:

Modified: head/contrib/bsnmp/snmpd/main.c
==============================================================================
--- head/contrib/bsnmp/snmpd/main.c	Sat Dec 24 11:22:28 2016	(r310497)
+++ head/contrib/bsnmp/snmpd/main.c	Sat Dec 24 11:23:18 2016	(r310498)
@@ -53,7 +53,6 @@
 #include <unistd.h>
 #include <signal.h>
 #include <dlfcn.h>
-#include <inttypes.h>
 
 #ifdef USE_TCPWRAPPERS
 #include <arpa/inet.h>
@@ -304,7 +303,6 @@ snmp_output(struct snmp_pdu *pdu, u_char
 static enum snmp_code
 snmp_pdu_auth_user(struct snmp_pdu *pdu)
 {
-	uint64_t etime;
 	usm_user = NULL;
 
 	/* un-authenticated snmpEngineId discovery */
@@ -312,6 +310,7 @@ snmp_pdu_auth_user(struct snmp_pdu *pdu)
 		pdu->engine.engine_len = snmpd_engine.engine_len;
 		memcpy(pdu->engine.engine_id, snmpd_engine.engine_id,
 		    snmpd_engine.engine_len);
+		update_snmpd_engine_time();
 		pdu->engine.engine_boots = snmpd_engine.engine_boots;
 		pdu->engine.engine_time = snmpd_engine.engine_time;
 		pdu->flags |= SNMP_MSG_AUTODISCOVER;
@@ -334,21 +333,14 @@ snmp_pdu_auth_user(struct snmp_pdu *pdu)
 
 	/* authenticated snmpEngineId discovery */
 	if ((pdu->flags & SNMP_MSG_AUTH_FLAG) != 0) {
-		etime = (get_ticks() - start_tick)  / 100ULL;
-		if (etime < INT32_MAX)
-			snmpd_engine.engine_time = etime;
-		else {
-			start_tick = get_ticks();
-			set_snmpd_engine();
-			snmpd_engine.engine_time = start_tick;
-		}
-
+		update_snmpd_engine_time();
 		pdu->user.auth_proto = usm_user->suser.auth_proto;
 		memcpy(pdu->user.auth_key, usm_user->suser.auth_key,
 		    sizeof(pdu->user.auth_key));
 
 		if (pdu->engine.engine_boots == 0 &&
 		    pdu->engine.engine_time == 0) {
+			update_snmpd_engine_time();
 		    	pdu->flags |= SNMP_MSG_AUTODISCOVER;
 			return (SNMP_CODE_OK);
 		}
@@ -643,6 +635,7 @@ decoded:
 		    pdu->engine.engine_time == 0) {
 			asn_append_oid(&(pdu->bindings[pdu->nbindings++].var),
 			    &oid_usmNotInTimeWindows);
+			update_snmpd_engine_time();
 			pdu->engine.engine_boots = snmpd_engine.engine_boots;
 			pdu->engine.engine_time = snmpd_engine.engine_time;
 		}

Modified: head/contrib/bsnmp/snmpd/snmpd.h
==============================================================================
--- head/contrib/bsnmp/snmpd/snmpd.h	Sat Dec 24 11:22:28 2016	(r310497)
+++ head/contrib/bsnmp/snmpd/snmpd.h	Sat Dec 24 11:23:18 2016	(r310498)
@@ -332,6 +332,7 @@ int init_actvals(void);
 extern char engine_file[];
 int init_snmpd_engine(void);
 int set_snmpd_engine(void);
+void update_snmpd_engine_time(void);
 
 int read_config(const char *, struct lmodule *);
 int define_macro(const char *name, const char *value);