[Core] Add core-option "reply_to_via"

Author: carstenbock

cfg.lex

@@ -240,6 +240,7 @@ DNS_SERVERS_NO  dns_servers_no
 DNS_USE_SEARCH  dns_use_search_list
 MAXBUFFER maxbuffer
 CHECK_VIA	check_via
+REPLY_TO_VIA    reply_to_via
 SHM_HASH_SPLIT_PERCENTAGE "shm_hash_split_percentage"
 SHM_SECONDARY_HASH_SIZE "shm_secondary_hash_size"
 MEM_WARMING_ENABLED "mem_warming"|"mem_warming_enabled"
@@ -471,6 +472,7 @@ SPACE		[ ]
 								return MAX_WHILE_LOOPS; }
 <INITIAL>{MAXBUFFER}	{ count(); yylval.strval=yytext; return MAXBUFFER; }
 <INITIAL>{CHECK_VIA}	{ count(); yylval.strval=yytext; return CHECK_VIA; }
+<INITIAL>{REPLY_TO_VIA} { count(); yylval.strval=yytext; return REPLY_TO_VIA; }
 <INITIAL>{SHM_HASH_SPLIT_PERCENTAGE}	{ count(); yylval.strval=yytext; return SHM_HASH_SPLIT_PERCENTAGE; }
 <INITIAL>{SHM_SECONDARY_HASH_SIZE}	{ count(); yylval.strval=yytext; return SHM_SECONDARY_HASH_SIZE; }
 <INITIAL>{MEM_WARMING_ENABLED}	{ count(); yylval.strval=yytext; return MEM_WARMING_ENABLED; }

cfg.y

@@ -321,6 +321,7 @@ extern int cfg_parse_only_routes;
 %token MAX_WHILE_LOOPS
 %token UDP_WORKERS
 %token CHECK_VIA
+%token REPLY_TO_VIA
 %token SHM_HASH_SPLIT_PERCENTAGE
 %token SHM_SECONDARY_HASH_SIZE
 %token MEM_WARMING_ENABLED
@@ -1072,6 +1073,8 @@ assign_stm: LOGLEVEL EQUAL snumber { IFOR();
 		}
 		| CHECK_VIA EQUAL NUMBER { check_via=$3; }
 		| CHECK_VIA EQUAL error { yyerror("boolean value expected"); }
+                | REPLY_TO_VIA EQUAL NUMBER { reply_to_via=$3; }
+                | REPLY_TO_VIA EQUAL error { yyerror("boolean value expected"); }
 		| SHM_HASH_SPLIT_PERCENTAGE EQUAL NUMBER { IFOR();
 			#ifdef HP_MALLOC
 			shm_hash_split_percentage=$3;

globals.c

@@ -91,6 +91,8 @@ char *log_name = 0;
 int config_check = 0;
 /* check if reply first via host==us */
 int check_via =  0;
+/* Reply to address indicated in Via */
+int reply_to_via = 0;
 /* debugging level for memory stats */
 int memlog = L_DBG + 11;
 int memdump = L_DBG + 10;