loop.c

/*
 * Copyright (c) 2012 The Chromium OS Authors.
 * Written by Mike Frysinger <vapier@gentoo.org>.
 *
 * 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.
 * 3. The name of the author may not be used to endorse or promote products
 *    derived from this software without specific prior written permission.
 *
 * 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.
 */

#include "defs.h"

#include <sys/ioctl.h>

#include <linux/loop.h>

static const struct xlat loop_flags_options[] = {
	{ LO_FLAGS_READ_ONLY,	"LO_FLAGS_READ_ONLY"	},
#if HAVE_DECL_LO_FLAGS_AUTOCLEAR
	{ LO_FLAGS_AUTOCLEAR,	"LO_FLAGS_AUTOCLEAR"	},
#endif
#if HAVE_DECL_LO_FLAGS_PARTSCAN
	{ LO_FLAGS_PARTSCAN,	"LO_FLAGS_PARTSCAN"	},
#endif
	{ 0,			NULL			},
};

static const struct xlat loop_crypt_type_options[] = {
	{ LO_CRYPT_NONE,	"LO_CRYPT_NONE"		},
	{ LO_CRYPT_XOR,		"LO_CRYPT_XOR"		},
	{ LO_CRYPT_DES,		"LO_CRYPT_DES"		},
	{ LO_CRYPT_FISH2,	"LO_CRYPT_FISH2"	},
	{ LO_CRYPT_BLOW,	"LO_CRYPT_BLOW"		},
	{ LO_CRYPT_CAST128,	"LO_CRYPT_CAST128"	},
	{ LO_CRYPT_IDEA,	"LO_CRYPT_IDEA"		},
	{ LO_CRYPT_DUMMY,	"LO_CRYPT_DUMMY"	},
	{ LO_CRYPT_SKIPJACK,	"LO_CRYPT_SKIPJACK"	},
	{ LO_CRYPT_CRYPTOAPI,	"LO_CRYPT_CRYPTOAPI"	},
	{ 0,			NULL			},
};

int loop_ioctl(struct tcb *tcp, long code, long arg)
{
	struct loop_info info;
	struct loop_info64 info64;
	char *s = alloca((LO_NAME_SIZE + LO_KEY_SIZE) * 4);

	if (entering(tcp))
		return 0;

	switch (code) {

	case LOOP_SET_STATUS:
	case LOOP_GET_STATUS:
		if (!verbose(tcp) || umove(tcp, arg, &info) < 0)
			return 0;

		tprintf(", {number=%d", info.lo_number);

		if (!abbrev(tcp)) {
			tprintf(", device=%#lx, inode=%lu, rdevice=%#lx",
				(unsigned long) info.lo_device,
				info.lo_inode,
				(unsigned long) info.lo_rdevice);
		}

		tprintf(", offset=%#x", info.lo_offset);

		if (!abbrev(tcp) || info.lo_encrypt_type != LO_CRYPT_NONE) {
			tprints(", encrypt_type=");
			printxval(loop_crypt_type_options, info.lo_encrypt_type,
				"LO_CRYPT_???");
			tprintf(", encrypt_key_size=%d", info.lo_encrypt_key_size);
		}

		tprints(", flags=");
		printflags(loop_flags_options, info.lo_flags, "LO_FLAGS_???");

		string_quote(info.lo_name, s, -1, LO_NAME_SIZE);
		tprintf(", name=%s", s);

		if (!abbrev(tcp) || info.lo_encrypt_type != LO_CRYPT_NONE) {
			string_quote((void *) info.lo_encrypt_key, s, 0, LO_KEY_SIZE);
			tprintf(", encrypt_key=%s", s);
		}

		if (!abbrev(tcp))
			tprintf(", init={%#lx, %#lx}"
				", reserved={%#x, %#x, %#x, %#x}}",
				info.lo_init[0], info.lo_init[1],
				info.reserved[0], info.reserved[1],
				info.reserved[2], info.reserved[3]);
		else
			tprints(", ...}");

		return 1;

	case LOOP_SET_STATUS64:
	case LOOP_GET_STATUS64:
		if (!verbose(tcp) || umove(tcp, arg, &info64) < 0)
			return 0;

		tprints(", {");

		if (!abbrev(tcp)) {
			tprintf("device=%" PRIu64 ", inode=%" PRIu64 ", "
				"rdevice=%" PRIu64 ", offset=%#" PRIx64 ", "
				"sizelimit=%" PRIu64 ", number=%" PRIu32,
				(uint64_t) info64.lo_device,
				(uint64_t) info64.lo_inode,
				(uint64_t) info64.lo_rdevice,
				(uint64_t) info64.lo_offset,
				(uint64_t) info64.lo_sizelimit,
				(uint32_t) info64.lo_number);
		} else {
			tprintf("offset=%#" PRIx64 ", number=%" PRIu32,
				(uint64_t) info64.lo_offset,
				(uint32_t) info64.lo_number);
		}

		if (!abbrev(tcp) || info64.lo_encrypt_type != LO_CRYPT_NONE) {
			tprints(", encrypt_type=");
			printxval(loop_crypt_type_options, info64.lo_encrypt_type,
				"LO_CRYPT_???");
			tprintf(", encrypt_key_size=%" PRIu32,
				info64.lo_encrypt_key_size);
		}

		tprints(", flags=");
		printflags(loop_flags_options, info64.lo_flags, "LO_FLAGS_???");

		string_quote((void *) info64.lo_file_name, s, -1, LO_NAME_SIZE);
		tprintf(", file_name=%s", s);

		if (!abbrev(tcp) || info64.lo_encrypt_type != LO_CRYPT_NONE) {
			string_quote((void *) info64.lo_crypt_name, s, -1, LO_NAME_SIZE);
			tprintf(", crypt_name=%s", s);
			string_quote((void *) info64.lo_encrypt_key, s, 0, LO_KEY_SIZE);
			tprintf(", encrypt_key=%s", s);
		}

		if (!abbrev(tcp))
			tprintf(", init={%#" PRIx64 ", %#" PRIx64 "}}",
				(uint64_t) info64.lo_init[0],
				(uint64_t) info64.lo_init[1]);
		else
			tprints(", ...}");

		return 1;

	case LOOP_CLR_FD:
#ifdef LOOP_SET_CAPACITY
	case LOOP_SET_CAPACITY:
#endif
#ifdef LOOP_CTL_GET_FREE
	/* newer loop-control stuff */
	case LOOP_CTL_GET_FREE:
#endif
		/* Takes no arguments */
		return 1;

	case LOOP_SET_FD:
	case LOOP_CHANGE_FD:
#ifdef LOOP_CTL_ADD
	/* newer loop-control stuff */
	case LOOP_CTL_ADD:
	case LOOP_CTL_REMOVE:
#endif
		/* These take simple args, so let default printer handle it */

	default:
		return 0;
	}
}