[openssh.git] / openbsd-compat / xmmap.c

/*
 * Copyright (c) 2002 Tim Rice.  All rights reserved.
 * MAP_FAILED code by Solar Designer.
 * 
 * Redistribution and use in source and binary forms, with or without
 * modification, are permitted provided that the following conditions
 * are met:
 * 1. Redistributions of source code must retain the above copyright
 *    notice, this list of conditions and the following disclaimer.
 * 2. Redistributions in binary form must reproduce the above copyright
 *    notice, this list of conditions and the following disclaimer in the
 *    documentation and/or other materials provided with the distribution.
 *
 * THIS SOFTWARE IS PROVIDED BY THE AUTHOR ``AS IS'' AND ANY EXPRESS OR
 * IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES
 * OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE DISCLAIMED.
 * IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR ANY DIRECT, INDIRECT,
 * INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT
 * NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE,
 * DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY
 * THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
 * (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF
 * THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
 */

/* $Id$ */

#include "includes.h"

#include <sys/types.h>
#ifdef HAVE_SYS_MMAN_H
#include <sys/mman.h>
#endif
#include <sys/stat.h>

#include "log.h"

void *xmmap(size_t size)
{
	void *address;

#ifdef HAVE_MMAP
# ifdef MAP_ANON
	address = mmap(NULL, size, PROT_WRITE|PROT_READ, MAP_ANON|MAP_SHARED,
	    -1, (off_t)0);
# else
	address = mmap(NULL, size, PROT_WRITE|PROT_READ, MAP_SHARED,
	    open("/dev/zero", O_RDWR), (off_t)0);
# endif

#define MM_SWAP_TEMPLATE "/var/run/sshd.mm.XXXXXXXX"
	if (address == (void *)MAP_FAILED) {
		char tmpname[sizeof(MM_SWAP_TEMPLATE)] = MM_SWAP_TEMPLATE;
		int tmpfd;
		mode_t old_umask;

		old_umask = umask(0177);
		tmpfd = mkstemp(tmpname);
		umask(old_umask);
		if (tmpfd == -1)
			fatal("mkstemp(\"%s\"): %s",
			    MM_SWAP_TEMPLATE, strerror(errno));
		unlink(tmpname);
		ftruncate(tmpfd, size);
		address = mmap(NULL, size, PROT_WRITE|PROT_READ, MAP_SHARED,
		    tmpfd, (off_t)0);
		close(tmpfd);
	}

	return (address);
#else
	fatal("%s: UsePrivilegeSeparation=yes and Compression=yes not supported",
	    __func__);
#endif /* HAVE_MMAP */

}
Commit	Line	Data
4165b82e	1	/*
1b7342ab	2	* Copyright (c) 2002 Tim Rice. All rights reserved.
	3	* MAP_FAILED code by Solar Designer.
	4	*
4165b82e	5	* Redistribution and use in source and binary forms, with or without
	6	* modification, are permitted provided that the following conditions
	7	* are met:
	8	* 1. Redistributions of source code must retain the above copyright
	9	* notice, this list of conditions and the following disclaimer.
	10	* 2. Redistributions in binary form must reproduce the above copyright
	11	* notice, this list of conditions and the following disclaimer in the
	12	* documentation and/or other materials provided with the distribution.
	13	*
	14	* THIS SOFTWARE IS PROVIDED BY THE AUTHOR ``AS IS'' AND ANY EXPRESS OR
	15	* IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES
	16	* OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE DISCLAIMED.
	17	* IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR ANY DIRECT, INDIRECT,
	18	* INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT
	19	* NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE,
	20	* DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY
	21	* THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
	22	* (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF
	23	* THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
	24	*/
	25
1b7342ab	26	/* $Id$ */
1b7342ab	27
4165b82e	28	#include "includes.h"
4165b82e	29
13ff27b7	30	#include <sys/types.h>
4165b82e	31	#ifdef HAVE_SYS_MMAN_H
	32	#include <sys/mman.h>
	33	#endif
13ff27b7	34	#include <sys/stat.h>
4165b82e	35
a93bd14c	36	#include "log.h"
a93bd14c	37
4165b82e	38	void *xmmap(size_t size)
	39	{
	40	void *address;
	41
	42	#ifdef HAVE_MMAP
	43	# ifdef MAP_ANON
	44	address = mmap(NULL, size, PROT_WRITE\|PROT_READ, MAP_ANON\|MAP_SHARED,
f6be21a0	45	-1, (off_t)0);
4165b82e	46	# else
4165b82e	47	address = mmap(NULL, size, PROT_WRITE\|PROT_READ, MAP_SHARED,
f6be21a0	48	open("/dev/zero", O_RDWR), (off_t)0);
4165b82e	49	# endif
	50
	51	#define MM_SWAP_TEMPLATE "/var/run/sshd.mm.XXXXXXXX"
4db587d2	52	if (address == (void *)MAP_FAILED) {
4165b82e	53	char tmpname[sizeof(MM_SWAP_TEMPLATE)] = MM_SWAP_TEMPLATE;
4165b82e	54	int tmpfd;
b347167a	55	mode_t old_umask;
4165b82e	56
b347167a	57	old_umask = umask(0177);
4165b82e	58	tmpfd = mkstemp(tmpname);
b347167a	59	umask(old_umask);
4165b82e	60	if (tmpfd == -1)
	61	fatal("mkstemp(\"%s\"): %s",
	62	MM_SWAP_TEMPLATE, strerror(errno));
	63	unlink(tmpname);
	64	ftruncate(tmpfd, size);
	65	address = mmap(NULL, size, PROT_WRITE\|PROT_READ, MAP_SHARED,
f6be21a0	66	tmpfd, (off_t)0);
4165b82e	67	close(tmpfd);
	68	}
	69
	70	return (address);
	71	#else
	72	fatal("%s: UsePrivilegeSeparation=yes and Compression=yes not supported",
	73	__func__);
	74	#endif /* HAVE_MMAP */
	75
	76	}
	77