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Bug #38096 stream_socket_accept : big timeout values are not taken into account
Submitted: 2006-07-13 14:50 UTC Modified: 2006-09-11 14:53 UTC
From: daniel dot menard at bdsp dot tm dot fr Assigned:
Status: Closed Package: Streams related
PHP Version: 5.1.4 OS: Win XP
Private report: No CVE-ID: None
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From: daniel dot menard at bdsp dot tm dot fr
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 [2006-07-13 14:50 UTC] daniel dot menard at bdsp dot tm dot fr
Time-out values passed to stream_socket_accept are not always taken into account has they should be.

Values from 0 to 4294 seconds work fine, greater values do not (4295 is equivalent to 0 sec, 4296 to 1 sec and so on).

From current cvs source, it appears that the timeout parameter is multiplied and then cast to an unsigned long which results in an overflow for values greater than 4294:
line 247 :
	/* prepare the timeout value for use */
	conv = (unsigned long) (timeout * 1000000.0);
	tv.tv_sec = conv / 1000000;
	tv.tv_usec = conv % 1000000;

Note: similar code can be found for stream_socket_client.

Perhaps there are good reasons to not accept such timeout values. In this case, raising a 'bad parameter' exception and a note in the documentation would be better options than silently accept the overflow.

Otherwise, a solution would be to test for big values:
if (timeout>4294){tv.tv_sec=timeout; tv.tv_usec=0;}
else { /* actual code */ }


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 [2006-09-11 14:53 UTC]
This bug has been fixed in CVS.

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