Add -b/bind_all option to rigctld

By default rigctld will not try all interfaces
Windows was not recognizing duplicate rigctld instances and failing with Log4OM
https://github.com/Hamlib/Hamlib/issues/1400

NEWS

@@ -13,6 +13,7 @@ Version 5.x -- future
         * Change FT1000MP Mark V model names to align with FT1000MP
 
 Version 4.6
+        * rigctld has new -b/bind-all option to try all interfaces -- restores original behavior.  This was done to fix duplicate rigctld instances on Windows
         * Yaesu rigs can now use send_morse to send keyer message 1-5 or a CW message up to 50 chars (which will use memory 1)
         * rig set level METER can now take SWR,COMP,ALC,IC/ID,DB,PO,VDD,TEMP arguments to set which meter to display
         * reg get level displays meter number=name now

doc/man1/rigctld.1

@@ -400,6 +400,10 @@ Sets password on rigctld which requires hamlib to use rig_set_password and rigct
 Will make rigctld close the rig when no clients are connected.  Normally remains connected to speed up connects.
 .
 .TP
+.BR \-b ", " \-\-bind_all
+Will make rigctld try to bind to first network device available.
+.
+.TP
 .BR \-h ", " \-\-help
 Show a summary of these options and exit.
 .

tests/rigctld.c

@@ -109,6 +109,7 @@ static struct option long_options[] =
     {"multicast-port",  1, 0, 'n'},
     {"password",        1, 0, 'A'},
     {"rigctld-idle",    0, 0, 'R'},
+    {"bind-all",        0, 0, 'b'},
     {0, 0, 0, 0}
 };
 
@@ -153,6 +154,7 @@ extern powerstat_t rig_powerstat;
 static int rigctld_idle =
     0; // if true then rig will close when no clients are connected
 static int skip_open = 0;
+static int bind_all = 0;
 
 #define MAXCONFLEN 2048
 
@@ -257,7 +259,7 @@ int main(int argc, char *argv[])
 
     struct addrinfo hints, *result, *saved_result;
     int sock_listen;
-    int reuseaddr = 1;
+//    int reuseaddr = 1;
     int twiddle_timeout = 0;
     int twiddle_rit = 0;
     int uplink = 0;
@@ -316,6 +318,10 @@ int main(int argc, char *argv[])
             rigctld_idle = 1;
             break;
 
+        case 'b':
+            bind_all = 1;
+            break;
+
         case 'A':
             strncpy(rigctld_password, optarg, sizeof(rigctld_password) - 1);
             //char *md5 = rig_make_m d5(rigctld_password);
@@ -886,6 +892,7 @@ int main(int argc, char *argv[])
             exit(2);
         }
 
+#if 0
         if (setsockopt(sock_listen,
                        SOL_SOCKET,
                        SO_REUSEADDR,
@@ -898,6 +905,7 @@ int main(int argc, char *argv[])
             freeaddrinfo(saved_result);     /* No longer needed */
             exit(1);
         }
+#endif
 
 #ifdef IPV6_V6ONLY
 
@@ -923,19 +931,26 @@ int main(int argc, char *argv[])
 
 #endif
 
-        if (0 == bind(sock_listen, result->ai_addr, result->ai_addrlen))
+        int retval = bind(sock_listen, result->ai_addr, result->ai_addrlen);
+        if (retval == 0)
         {
             break;
         }
+        {
+            rig_debug(RIG_DEBUG_ERR,"%s: bind: %s\n", __func__, strerror(errno));
+        }
 
-        handle_error(RIG_DEBUG_WARN, "binding failed (trying next interface)");
+        if (bind_all)
+            handle_error(RIG_DEBUG_WARN, "binding failed (trying next interface)");
+        else
+            handle_error(RIG_DEBUG_WARN, "binding failed");
 #ifdef __MINGW32__
         closesocket(sock_listen);
 #else
         close(sock_listen);
 #endif
     }
-    while ((result = result->ai_next) != NULL);
+    while (bind_all && ((result = result->ai_next) != NULL));
 
     freeaddrinfo(saved_result);     /* No longer needed */
 
@@ -1122,7 +1137,11 @@ int main(int argc, char *argv[])
     {
         rig_debug(RIG_DEBUG_WARN, "%u outstanding client(s)\n", client_count);
     }
-
+#ifdef __MINGW__
+    closesocket(sock_listen);
+#else
+    close(sock_listen);
+#endif
     rig_close(my_rig);
     mutex_rigctld(0);
 #else