From 0bb22808b466fa049de0b13d2cb3b34facc42446 Mon Sep 17 00:00:00 2001
From: Luke Bratch <luke@bratch.co.uk>
Date: Wed, 15 May 2019 21:53:29 +0100
Subject: Add custom command to let a client request a replay of however many
 seconds at any time.

---
 blabouncer.c | 74 +++++++++++++++++++++++++++++++++++++++++++++---------------
 1 file changed, 56 insertions(+), 18 deletions(-)

(limited to 'blabouncer.c')

diff --git a/blabouncer.c b/blabouncer.c
index 0f70deb..3cf9877 100644
--- a/blabouncer.c
+++ b/blabouncer.c
@@ -431,6 +431,35 @@ int removechannel(struct channel *channels, char *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, int arr_clients[], int arr_authed[], SSL **arr_ssl, struct settings *settings) {
+  char outgoingmsg[MAXDATASIZE];
+
+  // Figure out how many lines to replay
+  int numlines = replaylines(replayseconds);
+  printf("Replay log lines: '%d'.\n", numlines);
+
+  if (numlines < 0) {
+    printf("Error getting number of replay lines.\n");
+    exit(1);
+  }
+
+  // Replay those lines!
+  for (int i = 0; i < numlines; i++) {
+    if (!readreplayline(replayseconds, i, outgoingmsg)) {
+      printf("Error requesting replay line.\n");
+      exit(1);
+    }
+    printf("Sending replay line: '%s'.\n", outgoingmsg);
+    sendtoclient(sourcefd, outgoingmsg, arr_clients, arr_authed, arr_ssl, settings);
+  }
+
+  return 1;
+}
+
 // Figure out what to do with each CRLF-split IRC message (if anything)
 // by splitting out the different components by space character (ASCII 0x20).
 //
@@ -776,24 +805,8 @@ int processircmessage(SSL *server_ssl, int *clientsockfd, char *str, int source,
           sendtoclient(sourcefd, outgoingmsg, arr_clients, arr_authed, arr_ssl, settings);
         }
 
-        // Figure out how many lines to replay
-        int numlines = replaylines(settings->replayseconds);
-        printf("Replay log lines: '%d'.\n", numlines);
-
-        if (numlines < 0) {
-          printf("Error getting number of replay lines.\n");
-          exit(1);
-        }
-
-        // Relay those lines!
-        for (int i = 0; i < numlines; i++) {
-          if (!readreplayline(settings->replayseconds, i, outgoingmsg)) {
-            printf("Error requesting replay line.\n");
-            exit(1);
-          }
-          printf("Sending replay line: '%s'.\n", outgoingmsg);
-          sendtoclient(sourcefd, outgoingmsg, arr_clients, arr_authed, arr_ssl, settings);
-        }
+        // Catch the client up with the default number of seconds of replay
+        doreplay(sourcefd, settings->replayseconds, arr_clients, arr_authed, arr_ssl, settings);
 
         return 1;
       }
@@ -878,6 +891,31 @@ int processircmessage(SSL *server_ssl, int *clientsockfd, char *str, int source,
         return 1;
       }
 
+      // Custom BLABOUNCER command received
+      // Case insensitive comparisons here since clients won't be recognising and uppercasing these commands
+      if (strncasecmp(tokens[0], "BLABOUNCER", strlen(tokens[0])) == 0) {
+        // REPLAY received, send the requested number of seconds of replay to the client
+        if (strncasecmp(tokens[1], "REPLAY", strlen(tokens[1])) == 0) {
+          printf("Client REPLAY (custom blabouncer command) found and it is: %s with length %zd!\n", tokens[1], strlen(tokens[1]));
+          int replayseconds;
+          if ((replayseconds = strtol(tokens[2], NULL, 10)) == 0) {
+            printf("Invalid number of replay seconds provided by REPLAY.  Telling client.\n");
+            char outgoingmsg[MAXDATASIZE];
+            if (!snprintf(outgoingmsg, MAXDATASIZE, "Invalid number of seconds of replay requested by REPLAY command.")) {
+              fprintf(stderr, "Error while preparing invalid REPLAY command response, exiting!\n");
+              exit(1);
+            }
+            sendtoclient(sourcefd, outgoingmsg, arr_clients, arr_authed, arr_ssl, settings);
+            return 1;
+          }
+
+          doreplay(sourcefd, replayseconds, arr_clients, arr_authed, arr_ssl, settings);
+          return 1;
+        }
+
+        // If here then although BLABOUNCER command received, it wasn't recognised, so don't return
+      }
+
       break;
     default:
       fprintf(stderr, "Unexpected raw IRC string source!\n");
-- 
cgit v1.2.3