[monitoring-plugins] Add dontfrag/random for fping

[William]

 Module: monitoring-plugins
 Branch: master
 Commit: 88d991773b6d8ac416ad2931ea8debc949555c7a
 Author: William <william at blackhats.net.au>
   Date: Wed Nov  6 14:00:23 2024 +1000
    URL: https://www.monitoring-plugins.org/repositories/monitoring-plugins/commit/?id=88d9917

Add dontfrag/random for fping

Support the dont fragment and randomise packet data options for check_fping

---

 plugins/check_fping.c | 19 +++++++++++++++++++
 1 file changed, 19 insertions(+)

diff --git a/plugins/check_fping.c b/plugins/check_fping.c
index 49235e2..67fa236 100644
--- a/plugins/check_fping.c
+++ b/plugins/check_fping.c
@@ -60,6 +60,8 @@ static int packet_count = PACKET_COUNT;
 static int target_timeout = 0;
 static int packet_interval = 0;
 static bool verbose = false;
+static bool dontfrag = false;
+static bool randomize_packet_data = false;
 static int cpl;
 static int wpl;
 static double crta;
@@ -103,6 +105,11 @@ int main(int argc, char **argv) {
 		xasprintf(&option_string, "%s-S %s ", option_string, sourceip);
 	if (sourceif)
 		xasprintf(&option_string, "%s-I %s ", option_string, sourceif);
+	if (dontfrag)
+		xasprintf(&option_string, "%s-M ", option_string);
+	if (randomize_packet_data)
+		xasprintf(&option_string, "%s-R ", option_string);
+
 
 #ifdef PATH_TO_FPING6
 	if (address_family != AF_INET && is_inet6_addr(server))
@@ -279,6 +286,8 @@ int process_arguments(int argc, char **argv) {
 									   {"help", no_argument, 0, 'h'},
 									   {"use-ipv4", no_argument, 0, '4'},
 									   {"use-ipv6", no_argument, 0, '6'},
+									   {"dontfrag", no_argument, 0, 'M'},
+									   {"random", no_argument, 0, 'R'},
 									   {0, 0, 0, 0}};
 
 	rv[PL] = NULL;
@@ -390,6 +399,12 @@ int process_arguments(int argc, char **argv) {
 			else
 				usage(_("Interval must be a positive integer"));
 			break;
+		case 'R':
+			randomize_packet_data = true;
+			break;
+		case 'M':
+			dontfrag = true;
+			break;
 		}
 	}
 
@@ -470,6 +485,10 @@ void print_help(void) {
 	printf("    %s\n", _("name or IP Address of sourceip"));
 	printf(" %s\n", "-I, --sourceif=IF");
 	printf("    %s\n", _("source interface name"));
+	printf(" %s\n", "-M, --dontfrag");
+	printf("    %s\n", _("set the Don't Fragment flag"));
+	printf(" %s\n", "-R, --random");
+	printf("    %s\n", _("random packet data (to foil link data compression)"));
 	printf(UT_VERBOSE);
 	printf("\n");
 	printf(" %s\n", _("THRESHOLD is <rta>,<pl>%% where <rta> is the round trip average travel time (ms)"));