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# This patch remove the SNMP configuration verification and allow using null parameters.
# This allows the user to configure SNMP in /etc/snmp/snmp.conf and not use the command line
--- nagios-plugins-1.4.15/plugins/check_snmp.c.conf	2011-07-22 09:23:17.000000000 -0400
+++ nagios-plugins-1.4.15/plugins/check_snmp.c	2011-07-26 16:47:28.000000000 -0400
@@ -259,26 +259,29 @@
 	asprintf (&command_line[4], "%d", retries);
 	command_line[5] = strdup ("-m");
 	command_line[6] = strdup (miblist);
-	command_line[7] = "-v";
-	command_line[8] = strdup (proto);
 
 	for (i = 0; i < numauthpriv; i++) {
-		command_line[9 + i] = authpriv[i];
+		command_line[7 + i] = authpriv[i];
 	}
 
-	asprintf (&command_line[9 + numauthpriv], "%s:%s", server_address, port);
+	asprintf (&command_line[7 + numauthpriv], "%s:%s", server_address, port);
 
 	/* This is just for display purposes, so it can remain a string */
-	asprintf(&cl_hidden_auth, "%s -t %d -r %d -m %s -v %s %s %s:%s",
-		snmpcmd, timeout_interval, retries, strlen(miblist) ? miblist : "''", proto, "[authpriv]",
-		server_address, port);
+	if (proto != NULL)
+		asprintf(&cl_hidden_auth, "%s -t %d -r %d -m %s -v %s %s %s:%s",
+			snmpcmd, timeout_interval, retries, strlen(miblist) ? miblist : "''", proto, "[authpriv]",
+			server_address, port);
+	else
+		asprintf(&cl_hidden_auth, "%s -t %d -r %d -m %s %s %s:%s",
+			snmpcmd, timeout_interval, retries, strlen(miblist) ? miblist : "''", "[authpriv]",
+			server_address, port);
 
 	for (i = 0; i < numoids; i++) {
-		command_line[9 + numauthpriv + 1 + i] = oids[i];
+		command_line[7 + numauthpriv + 1 + i] = oids[i];
 		asprintf(&cl_hidden_auth, "%s %s", cl_hidden_auth, oids[i]);	
 	}
 
-	command_line[9 + numauthpriv + 1 + numoids] = NULL;
+	command_line[7 + numauthpriv + 1 + numoids] = NULL;
 
 	if (verbose)
 		printf ("%s\n", cl_hidden_auth);
@@ -808,9 +811,6 @@
 	if (server_address == NULL)
 		server_address = argv[optind];
 
-	if (community == NULL)
-		community = strdup (DEFAULT_COMMUNITY);
-
 	return validate_arguments ();
 }
 
@@ -835,9 +835,36 @@
 
 
 
+void addParam(char *flag, char*val) {
+	// We are lazy. Verify if the value is null and, if not, add it
+	if (flag != NULL && val != NULL) {
+		// Raise the amount of space required for our array
+		numauthpriv+=2;
+
+		if (authpriv == NULL)
+			authpriv = calloc(numauthpriv, sizeof(char *));
+		else
+			authpriv = realloc(authpriv, numauthpriv * sizeof(char *));
+	
+		authpriv[numauthpriv-2] = strdup(flag);
+		authpriv[numauthpriv-1] = strdup(val);
+	}
+}
+
+/*
+Protocol				Security			Params												Reason
+NULL						NULL					-c,-a,-u,-A,-x,-X							We don't know what the user wants. We overwrite anything provided.
+1								*							-v,-c													SNMP v1 supports only community
+2c							*							-v,-c													SNMP v2c supports only community
+3								NULL					-v,-u,-a,-A,-x,-X							We don't know the security required in snmp.conf. We provide anything
+3								authPriv			-v,-l,-u,-a,-A,-x,-X					We overwrite any Authentication of privacy setting of snmp.conf by command line
+3								noAuthNoPriv	-v,-l,-u											We provide version, security level and security name
+3								authNoPriv		-v,-l,-u,-a,-A								We provide version, security level, security name and password
+*/
 int
 validate_arguments ()
 {
+	numauthpriv=0;
 	/* check whether to load locally installed MIBS (CPU/disk intensive) */
 	if (miblist == NULL) {
 		if ( needmibs == TRUE ) {
@@ -855,75 +882,38 @@
 	if (numoids == 0)
 		die(STATE_UNKNOWN, _("No OIDs specified\n"));
 
-	if (proto == NULL)
-		asprintf(&proto, DEFAULT_PROTOCOL);
 
-	if ((strcmp(proto,"1") == 0) || (strcmp(proto, "2c")==0)) {	/* snmpv1 or snmpv2c */
-		numauthpriv = 2;
-		authpriv = calloc (numauthpriv, sizeof (char *));
-		authpriv[0] = strdup ("-c");
-		authpriv[1] = strdup (community);
-	}
-	else if ( strcmp (proto, "3") == 0 ) {		/* snmpv3 args */
-		if (seclevel == NULL)
-			asprintf(&seclevel, "noAuthNoPriv");
-
-		if (strcmp(seclevel, "noAuthNoPriv") == 0) {
-			numauthpriv = 2;
-			authpriv = calloc (numauthpriv, sizeof (char *));
-			authpriv[0] = strdup ("-l");
-			authpriv[1] = strdup ("noAuthNoPriv");
+	if (proto == NULL || strcmp (proto, "3") == 0) {
+		// No protocol will pass any valid parameter. See note before function for more explanation
+		if (proto == NULL) {
+				addParam("-c",community);
 		} else {
-			if (! ( (strcmp(seclevel, "authNoPriv")==0) || (strcmp(seclevel, "authPriv")==0) ) ) {
-				usage2 (_("Invalid seclevel"), seclevel);
-			}
-
-			if (authproto == NULL )
-				asprintf(&authproto, DEFAULT_AUTH_PROTOCOL);
-
-			if (secname == NULL)
-				die(STATE_UNKNOWN, _("Required parameter: %s\n"), "secname");
-
-			if (authpasswd == NULL)
-				die(STATE_UNKNOWN, _("Required parameter: %s\n"), "authpasswd");
-
-			if ( strcmp(seclevel, "authNoPriv") == 0 ) {
-				numauthpriv = 8;
-				authpriv = calloc (numauthpriv, sizeof (char *));
-				authpriv[0] = strdup ("-l");
-				authpriv[1] = strdup ("authNoPriv");
-				authpriv[2] = strdup ("-a");
-				authpriv[3] = strdup (authproto);
-				authpriv[4] = strdup ("-u");
-				authpriv[5] = strdup (secname);
-				authpriv[6] = strdup ("-A");
-				authpriv[7] = strdup (authpasswd);
-			} else if ( strcmp(seclevel, "authPriv") == 0 ) {
-				if (privproto == NULL )
-					asprintf(&privproto, DEFAULT_PRIV_PROTOCOL);
-
-				if (privpasswd == NULL)
-					die(STATE_UNKNOWN, _("Required parameter: %s\n"), "privpasswd");
-
-				numauthpriv = 12;
-				authpriv = calloc (numauthpriv, sizeof (char *));
-				authpriv[0] = strdup ("-l");
-				authpriv[1] = strdup ("authPriv");
-				authpriv[2] = strdup ("-a");
-				authpriv[3] = strdup (authproto);
-				authpriv[4] = strdup ("-u");
-				authpriv[5] = strdup (secname);
-				authpriv[6] = strdup ("-A");
-				authpriv[7] = strdup (authpasswd);
-				authpriv[8] = strdup ("-x");
-				authpriv[9] = strdup (privproto);
-				authpriv[10] = strdup ("-X");
-				authpriv[11] = strdup (privpasswd);
-			}
+				addParam("-v",proto);
 		}
+		addParam("-u",secname);
 
-	}
-	else {
+		if (seclevel == NULL || strcmp(seclevel, "authPriv")==0) {
+				addParam("-l",seclevel);
+				addParam("-a",authproto);
+				addParam("-A",authpasswd);
+				addParam("-x",privproto);
+				addParam("-X",privpasswd);
+		} else if (strcmp(seclevel, "noAuthNoPriv") == 0) {
+				addParam("-v",proto);
+				addParam("-l",seclevel);
+		} else if (strcmp(seclevel, "authNoPriv")==0) {
+				addParam("-v",proto);
+				addParam("-l",seclevel);
+				addParam("-a",authproto);
+				addParam("-A",authpasswd);
+		} else {
+				usage2 (_("Invalid seclevel"), seclevel);
+		}
+	} else if ((strcmp(proto,"1") == 0) || (strcmp(proto, "2c")==0)) {	/* snmpv1 or snmpv2c */
+		// If we specified protocol v2, the only param that is usefull is community string (if specified).
+		addParam("-v",proto);
+		addParam("-c",community);
+	}	else {
 		usage2 (_("Invalid SNMP version"), proto);
 	}
 
@@ -1011,12 +1001,11 @@
 	printf (" %s\n", "-a, --authproto=[MD5|SHA]");
 	printf ("    %s\n", _("SNMPv3 auth proto"));
 	printf (" %s\n", "-x, --privproto=[DES|AES]");
-	printf ("    %s\n", _("SNMPv3 priv proto (default DES)"));
+	printf ("    %s\n", _("SNMPv3 priv proto"));
 
 	/* Authentication Tokens*/
 	printf (" %s\n", "-C, --community=STRING");
 	printf ("    %s ", _("Optional community string for SNMP communication"));
-	printf ("(%s \"%s\")\n", _("default is") ,DEFAULT_COMMUNITY);
 	printf (" %s\n", "-U, --secname=USERNAME");
 	printf ("    %s\n", _("SNMPv3 username"));
 	printf (" %s\n", "-A, --authpassword=PASSWORD");
@@ -1076,6 +1065,8 @@
 
 	printf ("\n");
 	printf ("%s\n", _("Notes:"));
+	printf (" %s\n", _("- Default configurations are retrieved from /etc/snmp/snmp.conf. See man page of"));
+	printf ("   %s\n", _("snmp.conf for more information."));
 	printf (" %s\n", _("- Multiple OIDs may be indicated by a comma or space-delimited list (lists with"));
 	printf ("   %s %i %s\n", _("internal spaces must be quoted). Maximum:"), MAX_OIDS, _("OIDs."));