This patch will add the IP and port, or socket name, to the error message and

thus simplify the problem debugging: no need to check for this information in
the Nagios configuration.
This function is only used by 'check_tcp.c'.

Without the patch:

$ ./plugins/check_tcp -H 127.0.0.1 -p 21
Connection refused
$ ./plugins/check_tcp -H /var/spool/nagios/cmd/nagios.cmd
Permission denied

With the patch:

$ ./plugins/check_tcp -H 127.0.0.1 -p 21
connect to address 127.0.0.1 and port 21: Connection refused
$ ./plugins/check_tcp -H /var/spool/nagios/cmd/nagios.cmd
connect to socket /var/spool/nagios/cmd/nagios.cmd: Permission denied

Thanks to Davide Madrisan.
---
Closes  #1277

1 files changed, 13 insertions, 3 deletions

diff --git a/plugins/netutils.c b/plugins/netutils.c
index 0044046..4804218 100644
--- a/plugins/netutils.c
+++ b/plugins/netutils.c
@@ -167,11 +167,13 @@ np_net_connect (const char *host_name, int port, int *sd, int proto)
         char port_str[6], host[MAX_HOST_ADDRESS_LENGTH];
         size_t len;
         int socktype, result;
+        bool is_socket;
 
         socktype = (proto == IPPROTO_UDP) ? SOCK_DGRAM : SOCK_STREAM;
+        bool is_socket = (host_name[0] == '/');
 
         /* as long as it doesn't start with a '/', it's assumed a host or ip */
-        if(host_name[0] != '/'){
+        if (!is_socket){
                 memset (&hints, 0, sizeof (hints));
                 hints.ai_family = address_family;
                 hints.ai_protocol = proto;
@@ -253,7 +255,11 @@ np_net_connect (const char *host_name, int port, int *sd, int proto)
                         return econn_refuse_state;
                         break;
                 case STATE_CRITICAL: /* user did not set econn_refuse_state */
-                        printf ("%s\n", strerror(errno));
+                        if (is_socket)
+                                printf("connect to socket %s: %s\n", host_name, strerror(errno));
+                        else
+                                printf("connect to address %s and port %d: %s\n",
+                                       host_name, port, strerror(errno));
                         return econn_refuse_state;
                         break;
                 default: /* it's a logic error if we do not end up in STATE_(OK|WARNING|CRITICAL) */
@@ -262,7 +268,11 @@ np_net_connect (const char *host_name, int port, int *sd, int proto)
                 }
         }
         else {
-                printf ("%s\n", strerror(errno));
+                if (is_socket)
+                        printf("connect to socket %s: %s\n", host_name, strerror(errno));
+                else
+                        printf("connect to address %s and port %d: %s\n",
+                               host_name, port, strerror(errno));
                 return STATE_CRITICAL;
         }
 }