Implement new fping options for fping 5.2 and 5.3

fping 5.2 and 5.3 add some new useful command line options
which this commit add to check_fping.

These are:

 * --fwmark - sets a firewall mark in the packages to make them
   identifiable (fping 5.2)
 * --icmp-timestamp - fping uses ICMP timestamp instead of ICMP
   Echo (fping 5.2)
 * --check-source - fping discards replies which originate not from
   the target address (fping 5.2)

The fping release notes describe theses options ( https://github.com/schweikert/fping/releases )
in a little bit more detail.
Currently the help display for those options is only shown
when fping was available in the appropriate version during
compilation.

1 files changed, 24 insertions, 0 deletions

diff --git a/plugins/check_fping.d/config.h b/plugins/check_fping.d/config.h
index a0697bf3..6d28382a 100644
--- a/plugins/check_fping.d/config.h
+++ b/plugins/check_fping.d/config.h
@@ -29,6 +29,21 @@ typedef struct {
         bool cpl_p;
         int wpl;
         bool wpl_p;
+
+        // only available with fping version >= 5.2
+        // for a given uint _fwmark_ fping sets _fwmark_ as a firewall mark
+        // in the pakets
+        unsigned int fwmark;
+        bool fwmark_set;
+
+
+        // only available with fping version >= 5.3
+        // Setting icmp_timestamp tells fping to use ICMP Timestamp (ICMP type 13) instead
+        // of ICMP Echo
+        bool icmp_timestamp;
+
+        // Setting check_source lets fping  discard replies which are not from the target address
+        bool check_source;
 } check_fping_config;
 
 check_fping_config check_fping_config_init() {
@@ -53,6 +68,15 @@ check_fping_config check_fping_config_init() {
                 .cpl_p = false,
                 .wpl = 0,
                 .wpl_p = false,
+
+                // only available with fping version >= 5.2
+                .fwmark = 0,
+                .fwmark_set = false, // just to be deterministic
+
+                // only available with fping version >= 5.3
+                .icmp_timestamp = false,
+                .check_source = false,
+
         };
         return tmp;
 }