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-rw-r--r--src/map/clif.c51
1 files changed, 34 insertions, 17 deletions
diff --git a/src/map/clif.c b/src/map/clif.c
index 247fda5e6..67cc0ad72 100644
--- a/src/map/clif.c
+++ b/src/map/clif.c
@@ -8550,38 +8550,55 @@ void clif_parse_GetCharNameRequest(int fd, struct map_session_data *sd) {
}
/*==========================================
- *
+ * Validates and processes global messages
*------------------------------------------
*/
void clif_parse_GlobalMessage(int fd, struct map_session_data* sd) // S 008c/00f3 <packet len>.w <strz>.?B
{
char* message;
- unsigned int messagelen, packetlen, stringlen;
+ unsigned int packetlen, messagelen, namelen;
RFIFOHEAD(fd);
packetlen = RFIFOW(fd,2);
- if (packetlen < 4 + 1) { // at least an empty string is expected
- ShowWarning("clif_parse_globalmessage: Received malformed packet!");
+ if (packetlen > RFIFOREST(fd)) { // there has to be enough data to read
+ ShowWarning("clif_parse_GlobalMessage: Received malformed packet from player '%s' (length is incorrect)!", sd->status.name);
+ return;
+ }
+ if (packetlen < 4 + 1) { // 4-byte header and at least an empty string is expected
+ ShowWarning("clif_parse_GlobalMessage: Received malformed packet from player '%s' (no message data)!", sd->status.name);
return;
}
message = (char*)RFIFOP(fd,4);
- messagelen = strnlen(message, 255) + 1;
- if (messagelen == 256) { // message rejected for being too long
- message[256] = '\0';
- ShowWarning("clif_parse_globalmessage: Player '%s' sent a message too long ('%s')!", sd->status.name, message);
- return;
+ messagelen = packetlen - 4; // let's trust the client here, nothing can go wrong and it saves us one strlen()
+ if (messagelen > CHAT_SIZE) { // messages mustn't be too long
+ int i;
+ // special case here - allow some more freedom for frost joke & dazzler
+ for(i = 0; i < MAX_SKILLTIMERSKILL; i++) // the only way to check ~.~
+ if (sd->ud.skilltimerskill[i]->timer != -1 && (sd->ud.skilltimerskill[i]->skill_id == BA_FROSTJOKE || sd->ud.skilltimerskill[i]->skill_id == DC_SCREAM))
+ break;
+ if (i == MAX_SKILLTIMERSKILL) { // normal message, too long
+ ShowWarning("clif_parse_GlobalMessage: Player '%s' sent a message too long ('%.*s')!", sd->status.name, CHAT_SIZE, message);
+ return;
+ }
+ if (messagelen > 255) { // frost joke/dazzler, but still too long
+ ShowWarning("clif_parse_GlobalMessage: Player '%s' sent a message too long ('%.*s')!", sd->status.name, 255, message);
+ return;
+ }
}
-
- stringlen = packetlen - 4;
- if (messagelen != stringlen || //If the client is lying about the length...
- messagelen < strlen(sd->status.name) + 1 || //Or the incoming string is too short...
- strncmp(message, sd->status.name, strnlen(sd->status.name, NAME_LENGTH)) != 0) //Or the name does not match...
+ if (message[messagelen-1] != '\0') { // message must be zero-terminated
+ ShowWarning("clif_parse_GlobalMessage: Player '%s' sent an unterminated string!", sd->status.name);
+ return;
+ }
+
+ namelen = strnlen(sd->status.name, NAME_LENGTH - 1);
+ if (strncmp(message, sd->status.name, namelen) || // the name has to match the speaker's name
+ message[namelen] != ' ' || message[namelen+1] != ':' || message[namelen+2] != ' ') // completely, not just the prefix
{
- //Hacked message, or infamous "client desynch" issue where they pick
- //one char while loading another. Just kick them out to correct it.
- clif_setwaitclose(fd);
+ //Hacked message, or infamous "client desynch" issue where they pick one char while loading another.
+ clif_setwaitclose(fd); // Just kick them out to correct it.
+ ShowWarning("clif_parse_GlobalMessage: Player '%.*s' sent a messsage using an incorrect name ('%s')! Forcing a relog...", namelen, sd->status.name, message);
return;
}