Attempt at fixing check_snmp multiline output:

This patch tries to detect and output nicely multi-line strings. This
method is broken by design; only a count of double-quotes and escapes
could work in every situation.

plugins/check_snmp.c

@@ -117,7 +117,7 @@ int needmibs = FALSE;
 int
 main (int argc, char **argv)
 {
-	int i, len;
+	int i, len, line;
 	int iresult = STATE_UNKNOWN;
 	int result = STATE_UNKNOWN;
 	int return_code = 0;
@@ -126,6 +126,7 @@ main (int argc, char **argv)
 	char *cl_hidden_auth = NULL;
 	char *oidname = NULL;
 	char *response = NULL;
+	char *mult_resp = NULL;
 	char *outbuff;
 	char *ptr = NULL;
 	char *show = NULL;
@@ -249,10 +250,10 @@ main (int argc, char **argv)
 		}
 	}
 
-	for (i = 0; i < chld_out.lines; i++) {
+	for (line=0, i=0; line < chld_out.lines; line++, i++) {
 		const char *conv = "%.0f";
 
-		ptr = chld_out.line[i];
+		ptr = chld_out.line[line];
 		oidname = strpcpy (oidname, ptr, delimiter);
 		response = strstr (ptr, delimiter);
 		if (response == NULL)
@@ -283,6 +284,18 @@ main (int argc, char **argv)
 		else if (strstr (response, "STRING: ")) {
 			show = strstr (response, "STRING: ") + 8;
 			conv = "%.10g";
+			/* Get the rest of the string on multi-line strings */
+			if (show[0] == '"' && (response[strlen(response)-1] != '\"' || response[strlen(response)-2] != '\\')) {
+				/* Strip out unmatched double-quote */
+				if (show[0] == '"') show++;
+				if (!mult_resp) mult_resp = strdup("");
+				asprintf (&mult_resp, "%s%s:\n%s\n", mult_resp, oids[i], strstr (response, "STRING: ") + 8);
+				for (line++; line < chld_out.lines; line++) {
+					asprintf (&mult_resp, "%s%s\n", mult_resp, chld_out.line[line]);
+					if (mult_resp[strlen(mult_resp)-2] == '"' && response[strlen(response)-2] != '\\') break;
+				}
+			}
+
 		}
 		else if (strstr (response, "Timeticks: "))
 			show = strstr (response, "Timeticks: ");
@@ -367,6 +380,7 @@ main (int argc, char **argv)
 	}
 
 	printf ("%s %s -%s %s \n", label, state_text (result), outbuff, perfstr);
+	if (mult_resp) printf ("%s", mult_resp);
 
 	return result;
 }

plugins/tests/check_snmp_agent.pl

@@ -18,15 +18,24 @@ if (!$agent) {
 my $baseoid = '.1.3.6.1.4.1.8072.3.2.67';
 # Next are arrays of indexes (Type, initial value and increments)
 # Undef miltipliers are randomized
-my $multiline = "Cisco Internetwork Operating System Software
-IOS (tm) Catalyst 4000 L3 Switch Software (cat4000-I9K91S-M), Version
+my $multiline = 'Cisco Internetwork Operating System Software
+IOS (tm) Catalyst 4000 "L3" Switch Software (cat4000-I9K91S-M), Version
 12.2(20)EWA, RELEASE SOFTWARE (fc1)
 Technical Support: http://www.cisco.com/techsupport
 Copyright (c) 1986-2004 by cisco Systems, Inc.
-";
-my @fields = (ASN_OCTET_STR, ASN_UNSIGNED, ASN_UNSIGNED, ASN_COUNTER, ASN_COUNTER64, ASN_UNSIGNED);
-my @values = ($multiline, 4294965296, 1000, 4294965296, uint64("18446744073709351616"), int(rand(2**32)));
-my @incrts = (undef, 1000, -500, 1000, 100000, undef);
+';
+my $multilin2 = "Kisco Outernetwork Oserating Gystem Totware
+Copyleft (c) 2400-2689 by kisco Systrems, Inc.";
+my $multilin3 = 'This should not confuse check_snmp "parser"
+into thinking there is no 2nd line';
+my $multilin4 = 'It\'s getting even harder if the line
+ends with with this: C:\\';
+my $multilin5 = 'And now have fun with with this: "C:\\"
+because we\'re not done yet!';
+
+my @fields = (ASN_OCTET_STR, ASN_OCTET_STR, ASN_OCTET_STR, ASN_OCTET_STR, ASN_OCTET_STR, ASN_UNSIGNED, ASN_UNSIGNED, ASN_COUNTER, ASN_COUNTER64, ASN_UNSIGNED);
+my @values = ($multiline, $multilin2, $multilin3, $multilin4, $multilin5, 4294965296, 1000, 4294965296, uint64("18446744073709351616"), int(rand(2**32)));
+my @incrts = (undef, undef, undef, undef, undef, 1000, -500, 1000, 100000, undef);
 
 # Number of elements in our OID
 my $oidelts;