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Allow mixed line terminations (CR+LF/CR/LF) in non-RFC-compliant mode

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Up to now ngIRCd accepted CR+LF as well as a single CR or LF in "non RFC
compliant" mode (the default). But ngIRCd became confused when it received
data containing mixed line endings (e. g. "111\r222\n333\r\n").

This patch enables ngIRCd (in "non RFC compliant" mode) to detect CR+LF,
CR, and LF as equally good line termination sequences and to always end the
command after the first one detected.

Some clients (for exmaple Trilian) are that ... broken to send such mixed
line terminations ...

First patch proposed by Scott Perry <scperry@ucsd.edu>,
Thanks to Ali Shemiran <ashemira@ucsd.edu> for testing!

(manually cherry picked from commit a84f7dcee5a1b32c74188aa5374d30eddd24852b)
This commit is contained in:
Alexander Barton 2008-06-11 16:00:38 +02:00
parent b6b019dddc
commit fb46757c48
2 changed files with 33 additions and 10 deletions
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33
src/ngircd/conn.c
View File

@ -1227,7 +1227,7 @@ Handle_Buffer( CONN_ID Idx )
/* Handle Data in Connections Read-Buffer.
* Return true if a reuqest was handled, false otherwise (also returned on errors). */
#ifndef STRICT_RFC
char *ptr1, *ptr2;
char *ptr1, *ptr2, *first_eol;
#endif
char *ptr;
size_t len, delta;
@ -1255,19 +1255,32 @@ Handle_Buffer( CONN_ID Idx )
return false;
/* A Complete Request end with CR+LF, see RFC 2812. */
delta = 2;
ptr = strstr( array_start(&My_Connections[Idx].rbuf), "\r\n" );
if( ptr ) delta = 2; /* complete request */
#ifndef STRICT_RFC
else {
/* Check for non-RFC-compliant request (only CR or LF)? Unfortunately,
* there are quite a few clients that do this (incl. "mIRC" :-( */
ptr1 = strchr( array_start(&My_Connections[Idx].rbuf), '\r' );
ptr2 = strchr( array_start(&My_Connections[Idx].rbuf), '\n' );
/* Check for non-RFC-compliant request (only CR or LF)?
* Unfortunately, there are quite a few clients out there
* that do this -- e. g. mIRC, BitchX, and Trillian :-( */
ptr1 = strchr(array_start(&My_Connections[Idx].rbuf), '\r');
ptr2 = strchr(array_start(&My_Connections[Idx].rbuf), '\n');
if (ptr) {
/* Check if there is a single CR or LF _before_ the
* corerct CR+LF line terminator: */
first_eol = ptr1 < ptr2 ? ptr1 : ptr2;
if (first_eol < ptr) {
/* Single CR or LF before CR+LF found */
ptr = first_eol;
delta = 1;
}
} else if (ptr1 || ptr2) {
/* No CR+LF terminated command found, but single
* CR or LF found ... */
if (ptr1 && ptr2)
ptr = ptr1 < ptr2 ? ptr1 : ptr2;
else
ptr = ptr1 ? ptr1 : ptr2;
delta = 1;
if( ptr1 && ptr2 ) ptr = ptr1 > ptr2 ? ptr2 : ptr1;
else if( ptr1 ) ptr = ptr1;
else if( ptr2 ) ptr = ptr2;
}
#endif

10
src/ngircd/parse.c
View File

@ -337,12 +337,20 @@ Validate_Command( UNUSED CONN_ID Idx, UNUSED REQUEST *Req, bool *Closed )
static bool
Validate_Args(CONN_ID Idx, REQUEST *Req, bool *Closed)
{
#ifdef STRICT_RFC
int i;
#endif
assert( Idx >= 0 );
assert( Req != NULL );
*Closed = false;
#ifdef STRICT_RFC
/* CR and LF are never allowed in command parameters.
* But since we do accept lines terminated only with CR or LF in
* "non-RFC-compliant mode" (besides the correct CR+LF combination),
* this check can only trigger in "strict RFC" mode; therefore we
* optimize it away otherwise ... */
for (i = 0; i < Req->argc; i++) {
if (strchr(Req->argv[i], '\r') || strchr(Req->argv[i], '\n')) {
Log(LOG_ERR,
@ -354,6 +362,8 @@ Validate_Args(CONN_ID Idx, REQUEST *Req, bool *Closed)
return false;
}
}
#endif
return true;
} /* Validate_Args */