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TinTin++ Mud Client

bugs of BIG5 lines parser

 
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fog_proxy



Joined: 18 Oct 2005
Posts: 16
PostPosted: Mon Oct 31, 2005 3:35 am    Post subject: bugs of BIG5 lines parser Reply with quote
Well,I found there are two bugs when tintin++ parser the big5 characters with unreassemble telnet packets.

1.

For example,if a mud line send from telnet server looks like:

packet 1:
aaaaaabbbbbbbb...0xff
packet 2:
0xf9

here 0xff0xf9 should be a telnet command(GA),but in function translate_telopts(),there are no handles of this case.

2.

just the check of big5 characters not right.(please see my patch)

--------------------------------------------------------------------------------------------------------
Code:

--- tt-org/src/telopt.c   2005-09-30 19:04:32.000000000 +0800
+++ tt-new/src/telopt.c   2005-10-31 16:08:50.445929960 +0800
@@ -115,6 +115,9 @@
    int skip, cnt;
    unsigned char *cpdst;
    unsigned char *cpsrc;
+#ifdef YTIN_EX
+    int IAC_pending = FALSE;
+#endif
 
    if (cplen == 0)
    {
@@ -181,11 +184,33 @@
 
    cpdst = (unsigned char *) gtd->mud_output_buf + gtd->mud_output_len;
 
-   while (cplen > 0)
+#ifdef YTIN_EX
+    if(IAC_pending)
    {
+        gtd->mud_output_buf[gtd->mud_output_len] = IAC;
+        gtd->mud_output_len++;
+        gtd->mud_output_buf[gtd->mud_output_len] = 0;
+        IAC_pending = FALSE;
+    }
+#endif
 
+   while (cplen > 0)
+   {
       if (*cpsrc == IAC)
       {
+#ifdef YTIN_EX           
+            if(cplen < 2)
+            {
+                /*
+                 * Not enough space for telnet command,it should be
+                 * continued
+                 */
+                IAC_pending = TRUE;
+                skip = 1;
+            }
+            else
+            {
+#endif               
          if (HAS_BIT(ses->flags, SES_FLAG_DEBUGTELNET))
          {
             switch(cpsrc[1])
@@ -288,6 +313,9 @@
                skip = 1;
                break;
          }
+#ifdef YTIN_EX               
+            }
+#endif           
          cplen -= skip;
          cpsrc += skip;
       }
@@ -297,8 +325,11 @@
          *cpdst++ = *cpsrc++;
          gtd->mud_output_len++;
          cplen--;
-
+#ifdef YTIN_EX
+         if ((*cpsrc)&&(cplen > 0))
+#else               
          if (*cpsrc)
+#endif               
          {
             *cpdst++ = *cpsrc++;
             gtd->mud_output_len++;

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Scandum
Site Admin


Joined: 03 Dec 2004
Posts: 3274
PostPosted: Mon Oct 31, 2005 6:00 am    Post subject: Re: bugs of BIG5 lines parser Reply with quote
fog_proxy wrote:
here 0xff0xf9 should be a telnet command(GA),but in function translate_telopts(),there are no handles of this case.

It's probably a better idea if I move the packet patch code from rl.c to telopt.c. That way larger telopts are dealt with as well. Sorry for being picky, but I do appreciate the effort.

Quote:

just the check of big5 characters not right.(please see my patch)

I see, I'll take care of that.
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fog_proxy



Joined: 18 Oct 2005
Posts: 16
PostPosted: Mon Oct 31, 2005 6:55 am    Post subject: Reply with quote
"from rl.c to telopt.c" or "from telopt.c to rl.c"?Anyway,will be glad to see a new version,I just modified for provisionally use Smile
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