Introducing socket_datasync

a user-friendly way to notify users when their servers are out of sync, e.g.
http://hercules.ws/board/topic/328-intif-guild-data-size-error/
http://hercules.ws/board/topic/315-error-chrif-authok-data-size-mismatch-52224-52228/

Signed-off-by: shennetsind <ind@henn.et>

2 files changed, 68 insertions, 1 deletions

diff --git a/src/common/socket.c b/src/common/socket.c
index 72633cf2b..701fbc685 100644
--- a/src/common/socket.c
+++ b/src/common/socket.c
@@ -1337,7 +1337,6 @@ void socket_init(void)
 	ShowInfo("Server supports up to '"CL_WHITE"%u"CL_RESET"' concurrent connections.\n", rlim_cur);
 }
 
-
 bool session_isValid(int fd)
 {
 	return ( fd > 0 && fd < FD_SETSIZE && session[fd] != NULL );
@@ -1377,6 +1376,71 @@ uint16 ntows(uint16 netshort)
 	return ((netshort & 0xFF) << 8) | ((netshort & 0xFF00) >> 8);
 }
 
+/* [Ind/Hercules] - socket_datasync */
+void socket_datasync(int fd, bool send) {
+	struct {
+		unsigned int length;/* short is not enough for some */
+	} data_list[] = {
+		{ sizeof(struct mmo_charstatus) },
+		{ sizeof(struct quest) },
+		{ sizeof(struct item) },
+		{ sizeof(struct point) },
+		{ sizeof(struct s_skill) },
+		{ sizeof(struct global_reg) },
+		{ sizeof(struct accreg) },
+		{ sizeof(struct status_change_data) },
+		{ sizeof(struct storage_data) },
+		{ sizeof(struct guild_storage) },
+		{ sizeof(struct s_pet) },
+		{ sizeof(struct s_mercenary) },
+		{ sizeof(struct s_homunculus) },
+		{ sizeof(struct s_elemental) },
+		{ sizeof(struct s_friend) },
+		{ sizeof(struct mail_message) },
+		{ sizeof(struct mail_data) },
+		{ sizeof(struct registry) },
+		{ sizeof(struct party_member) },
+		{ sizeof(struct party) },
+		{ sizeof(struct guild_member) },
+		{ sizeof(struct guild_position) },
+		{ sizeof(struct guild_alliance) },
+		{ sizeof(struct guild_expulsion) },
+		{ sizeof(struct guild_skill) },
+		{ sizeof(struct guild) },
+		{ sizeof(struct guild_castle) },
+		{ sizeof(struct fame_list) },
+	};
+	unsigned short i;
+	if( send ) {
+		unsigned short p_len = ( sizeof(data_list) * 4 ) + 4;
+		WFIFOHEAD(fd, p_len);
+
+		WFIFOW(fd, 0) = 0x2b0a;
+		WFIFOW(fd, 2) = p_len;
+		
+		for( i = 0; i < sizeof(data_list); i++ ) {
+			WFIFOL(fd, 4 + ( i * 4 ) ) = data_list[i].length;
+		}
+		
+		WFIFOSET(fd, p_len);
+	} else {
+		for( i = 0; i < sizeof(data_list); i++ ) {
+			if( RFIFOL(fd, 4 + (i * 4) ) != data_list[i].length ) {
+				/* force the other to go wrong too so both are taken down */
+				WFIFOHEAD(fd, 8);
+				WFIFOW(fd, 0) = 0x2b0a;
+				WFIFOW(fd, 2) = 8;
+				WFIFOL(fd, 4) = 0;
+				WFIFOSET(fd, 8);
+				flush_fifo(fd);
+				/* shut down */
+				ShowFatalError("Servers are out of sync! recompile from scratch\n");
+				exit(EXIT_FAILURE);
+			}
+		}
+	}
+}
+
 #ifdef SEND_SHORTLIST
 // Add a fd to the shortlist so that it'll be recognized as a fd that needs
 // sending or eof handling.
diff --git a/src/common/socket.h b/src/common/socket.h
index 7c0e02f5d..4879cb109 100644
--- a/src/common/socket.h
+++ b/src/common/socket.h
@@ -145,6 +145,9 @@ extern int naddr_;   // # of ip addresses
 
 void set_eof(int fd);
 
+/* [Ind/Hercules] - socket_datasync */
+void socket_datasync(int fd, bool send);
+
 /// Use a shortlist of sockets instead of iterating all sessions for sockets 
 /// that have data to send or need eof handling.
 /// Adapted to use a static array instead of a linked list.