From 61e4bb73c9ca74ac320f6206bcf6378239c48cbc Mon Sep 17 00:00:00 2001
From: piaip <piaip@63ad8ddf-47c3-0310-b6dd-a9e9d9715204>
Date: Wed, 11 Apr 2012 11:07:37 +0000
Subject: Redefine request buffer size

git-svn-id: http://opensvn.csie.org/pttbbs/trunk@5622 63ad8ddf-47c3-0310-b6dd-a9e9d9715204
---
 pttbbs/daemon/logind/logind.c | 13 ++++++++++++-
 1 file changed, 12 insertions(+), 1 deletion(-)

diff --git a/pttbbs/daemon/logind/logind.c b/pttbbs/daemon/logind/logind.c
index acaa6aec..0c56602a 100644
--- a/pttbbs/daemon/logind/logind.c
+++ b/pttbbs/daemon/logind/logind.c
@@ -64,6 +64,10 @@
 #define LOGIND_ACKQUEUE_BOUND   (255)
 #endif 
 
+#ifndef LOGIND_TUNNEL_BUFFER_BOUND
+#define LOGIND_TUNNEL_BUFFER_BOUND  (65530)
+#endif
+
 #define MY_EVENT_PRIORITY_NUMBERS   (4)
 #define EVTPRIORITY_NORM    (MY_EVENT_PRIORITY_NUMBERS/2)
 #define EVTPRIORITY_ACK     (EVTPRIORITY_NORM-1)
@@ -1089,19 +1093,26 @@ is_tunnel_available() {
     int nwrite = 0, sndbuf = 0;
     socklen_t len = 0;
 
+    // for each client we need to send two kinds of data:
+    //  send_remote_fd: struct msghdr + char[CMSG_SPACE(sizeof(int))];
+    //  towrite: sizeof(login_data)
+    // However, it's hard to estimate how much sendmsg() needs.
+
     if (ackq_size() > LOGIND_ACKQUEUE_BOUND)
         return 0;
 
+#ifdef LOGIND_TUNNEL_BUFFER_BOUND
     ioctl(g_tunnel, FIONWRITE, &nwrite);
     len = sizeof(sndbuf);
     getsockopt(g_tunnel, SOL_SOCKET, SO_SNDBUF, &sndbuf, &len);
 
-    if (sndbuf >= nwrite && (sndbuf - nwrite) < (int)sizeof(login_data) * 5) {
+    if (sndbuf >= nwrite && (sndbuf - nwrite) < LOGIND_TUNNEL_BUFFER_BOUND) {
         time4_t now = time(NULL);
         fprintf(stderr, LOG_PREFIX "%s tunnel buffer is full (%d/%d)\n",
                 Cdate(&now), nwrite, sndbuf);
         return 0;
     }
+#endif
 
     return 1;
 }
-- 
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