From 62e67b22e721d2e08c4a4d5dbc85e404fd2ba507 Mon Sep 17 00:00:00 2001
From: Luke Bratch <luke@bratch.co.uk>
Date: Sun, 19 May 2019 22:08:40 +0100
Subject: Don't log replay TOPIC/JOIN/PART if we're not in that channel, and
 don't ever replay them if they were from ourself.

---
 blabouncer.c | 78 ++++++++++++++++++++++++++++++++++++++++++++++++++++++++----
 1 file changed, 74 insertions(+), 4 deletions(-)

(limited to 'blabouncer.c')

diff --git a/blabouncer.c b/blabouncer.c
index a6a811a..6d473c9 100644
--- a/blabouncer.c
+++ b/blabouncer.c
@@ -417,7 +417,7 @@ int channelgotnames(struct channel *channels, char *name) {
     if (strncmp(channels[i].name, name, strlen(name)) == 0) {
       if (channels[i].gotnames) {
         printf("channelgotnames(): channel '%s' gotnames was set, returning '%d'.\n", channels[i].name, channels[i].gotnames);
-        return channels[i].gotnames;
+        return i;
       } else {
         printf("channelgotnames(): channel '%s' gotnames was not set, returning '%d'.\n", channels[i].name, channels[i].gotnames);
         return 0;
@@ -430,11 +430,34 @@ int channelgotnames(struct channel *channels, char *name) {
   return 0;
 }
 
+// Check if we are in a channel named "name" or not.
+// Return 1 if we are, or 0 if not.
+int inchannel(struct channel *channels, char *name) {
+  // Make sure the name doesn't have any trailing CR or LF
+  // (But only if name is at least two characters long already)
+  if (strlen(name) >= 2) {
+    while (name[strlen(name) - 1] == '\r' || name[strlen(name) - 1] == '\n') {
+      name[strlen(name) - 1] = '\0';
+    }
+  }
+
+  for (int i = 0; i < MAXCHANNELS; i++) {
+    if (strncmp(channels[i].name, name, strlen(name)) == 0) {
+      printf("inchannel(): in channel '%s'.\n", name);
+      return 1;
+    }
+  }
+
+  // We're not in the channel
+  printf("inchannel(): NOT in channel '%s'.\n", name);
+  return 0;
+}
+
 // Send the requested number of lines of replay log to the requested client
 // 'sourcefd' is the client to send to, and replayseconds is the number of
 // seconds of replay to replay.
 // Returns 1 for success or 0 for failure.
-int doreplay(int sourcefd, int replayseconds, struct client *clients, struct settings *settings, struct ircdstrings *ircdstrings) {
+int doreplay(int sourcefd, int replayseconds, struct client *clients, struct settings *settings, struct ircdstrings *ircdstrings, struct channel *channels) {
   char outgoingmsg[MAXDATASIZE];
 
   // Figure out how many lines to replay
@@ -460,6 +483,53 @@ int doreplay(int sourcefd, int replayseconds, struct client *clients, struct set
       printf("Error requesting replay line.\n");
       exit(1);
     }
+
+    // Check if the replay line is a TOPIC, a JOIN, or a PART so we don't
+    // replay those if we are not currently in the channel they are from
+    // otherwise clients and state go a bit mad.
+    // Never replay them if they are from us.
+
+    // Copy to a temporary string
+    char *strcopy = strdup(outgoingmsg);
+    // Keep track of initial pointer for free()ing later
+    char *strcopyPtr = strcopy;
+
+    // Build array of each space-separated token
+    char tokens[3][MAXDATASIZE];
+    char *token;
+
+    for (int j = 0; j < 3; j++) {
+      // Try to split
+      if ((token = strsep(&strcopy, " ")) == NULL) {
+        printf("doreplay(): error splitting string on iteration %d, exiting!\n", j);
+        exit(1);
+      }
+      // Copy into the token array (strlen + 1 to get the NULL terminator)
+      strncpy(tokens[j], token, strlen(token) + 1);
+    }
+
+    if (strncmp(tokens[1], "TOPIC", strlen("TOPIC")) == 0 ||
+        strncmp(tokens[1], "JOIN", strlen("JOIN")) == 0 ||
+        strncmp(tokens[1], "PART", strlen("PART")) == 0) {
+      // Skip over colon if present in channel name
+      int offset = 0;
+      if (tokens[2][0] == ':') {
+        offset = 1;
+      }
+
+      // To make sure it's not us
+      extractnickfromprefix(tokens[0]);
+
+      // Check if we're currently in this channel or if the log line is from us
+      if (!inchannel(channels, tokens[2] + offset) || strncmp(tokens[0], ircdstrings->ircnick, strlen(tokens[0])) == 0) {
+        printf("Not sending '%s' replay line '%s'.\n", tokens[1], outgoingmsg);
+        free(strcopyPtr);
+        continue;
+      }
+    }
+
+    free(strcopyPtr);
+
     printf("Sending replay line: '%s'.\n", outgoingmsg);
     sendtoclient(sourcefd, outgoingmsg, clients, settings);
   }
@@ -1303,7 +1373,7 @@ int processircmessage(SSL *server_ssl, char *str, int source, struct client *cli
         clients[arrindex(clients, sourcefd)].registered = 1;
 
         // Catch the client up with the default number of seconds of replay
-        doreplay(sourcefd, settings->replayseconds, clients, settings, ircdstrings);
+        doreplay(sourcefd, settings->replayseconds, clients, settings, ircdstrings, channels);
 
         free(strcopyPtr);
         return 1;
@@ -1488,7 +1558,7 @@ int processircmessage(SSL *server_ssl, char *str, int source, struct client *cli
             return 1;
           }
 
-          doreplay(sourcefd, replayseconds, clients, settings, ircdstrings);
+          doreplay(sourcefd, replayseconds, clients, settings, ircdstrings, channels);
           free(strcopyPtr);
           return 1;
         // Unrecognised BLABOUNCER command received, send some help instructions
-- 
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