accept_loop.c
author Mahlon E. Smith <mahlon@laika.com>
Tue, 09 Jun 2015 16:40:09 -0700
changeset 34 fbfdaa5215a3
parent 32 6dc2d52e4b13
permissions -rw-r--r--
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/* vim: set noet nosta sw=4 ts=4 ft=c : */
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/*
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Copyright (c) 2011-2015, Mahlon E. Smith <mahlon@martini.nu>
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All rights reserved.
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Redistribution and use in source and binary forms, with or without
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modification, are permitted provided that the following conditions are met:
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    * Redistributions of source code must retain the above copyright
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      notice, this list of conditions and the following disclaimer.
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    * Redistributions in binary form must reproduce the above copyright
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      notice, this list of conditions and the following disclaimer in the
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      documentation and/or other materials provided with the distribution.
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    * Neither the name of Mahlon E. Smith nor the names of his
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      contributors may be used to endorse or promote products derived
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      from this software without specific prior written permission.
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THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND ANY
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EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED
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WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE
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DISCLAIMED. IN NO EVENT SHALL THE REGENTS AND CONTRIBUTORS BE LIABLE FOR ANY
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DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES
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(INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES;
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LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND
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ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
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(INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF THIS
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SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
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*/
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#include "volta.h"
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/*
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 * Accept and process lines from squid.
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 */
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int
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accept_loop( void )
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{
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	/* incoming line (stack) */
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	char buf[ LINE_BUFSIZE ];
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	/* incoming line (heap) */
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	char *line = NULL;
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	/* the length of the incoming line buffer */
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	unsigned short int bufsize;
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	debug( 1, LOC, "Waiting for input...\n" );
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	while ( fgets( buf, LINE_BUFSIZE, stdin ) != NULL ) {
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		bufsize = strlen( buf );
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		/* Common case, or last iteration of loop:
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		   End of line was found without filling LINE_BUFSIZE
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		 */
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		if ( bufsize + 1 < LINE_BUFSIZE ) {
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			/* line wasn't concatenated onto in previous loops,
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			 * just pass it directly to process() */
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			if ( line == NULL ) {
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				process( buf );
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			}
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			/* memory was previously allocated to contain the line, 
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			 * append the final chunk, pass to process(), and cleanup. */
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			else {
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				if ( (line = extend_line( line, buf )) == NULL ) continue;
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				process( line );
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				free( line ), line = NULL;
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			}
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		}
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		/* If we've filled LINE_BUFSIZE on this iteration, we were likely
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		 * passed a very long URL that we'll need to allocate more memory
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		 * for.  Rebuild the line in chunks for each loop iteration.
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		 *
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		 * If we didn't do this, you could thwart proper parsing by
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		 * simply sending requests greater than LINE_BUFSIZE characters.
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		 */
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		else {
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			if ( (line = extend_line( line, buf )) == NULL ) continue;
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			/* Special case if the current buffer's last character is a
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			 * newline. This means that the buffer length is exactly
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			 * LINE_BUFSIZE, but we can't simply check for that, since
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			 * we don't know if there are more iterations pending
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			 * (within the current line) that still need to be appended.
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			 */
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			if ( buf[ bufsize - 1 ] == '\n' ) {
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				process( line );
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				free( line ), line = NULL;
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			}
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		}
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	}
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	/* stdin closed */
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	debug( 1, LOC, "End of stream\n" );
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	return( 0 );
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}
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