172 lines
3.2 KiB
C
172 lines
3.2 KiB
C
/*
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* Guillaume Cottenceau (gc@mandrakesoft.com)
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*
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* Copyright 2000 MandrakeSoft
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*
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* This software may be freely redistributed under the terms of the GNU
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* public license.
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*
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* You should have received a copy of the GNU General Public License
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* along with this program; if not, write to the Free Software
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* Foundation, Inc., 675 Mass Ave, Cambridge, MA 02139, USA.
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*
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*/
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/* This code comes from util-linux-2.10n (mount/lomount.c)
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* (this is a simplified version of this code)
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*/
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#include <sys/types.h>
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#include <sys/mount.h>
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#include <sys/ioctl.h>
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#include <sys/mount.h>
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#include <errno.h>
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#include <fcntl.h>
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#include <stdio.h>
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#include <string.h>
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#include <unistd.h>
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#include "stage1.h"
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#include "frontend.h"
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#include "log.h"
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#include "mount.h"
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#include "modules.h"
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#include "lomount.h"
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#define LO_NAME_SIZE 64
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#define LO_KEY_SIZE 32
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struct loop_info
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{
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int lo_number; /* ioctl r/o */
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dev_t lo_device; /* ioctl r/o */
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unsigned long lo_inode; /* ioctl r/o */
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dev_t lo_rdevice; /* ioctl r/o */
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int lo_offset;
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int lo_encrypt_type;
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int lo_encrypt_key_size; /* ioctl w/o */
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int lo_flags; /* ioctl r/o */
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char lo_name[LO_NAME_SIZE];
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unsigned char lo_encrypt_key[LO_KEY_SIZE]; /* ioctl w/o */
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unsigned long lo_init[2];
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char reserved[4];
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};
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#define LOOP_SET_FD 0x4C00
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#define LOOP_CLR_FD 0x4C01
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#define LOOP_SET_STATUS 0x4C02
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#define LOOP_GET_STATUS 0x4C03
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int
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set_loop (const char *device, const char *file)
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{
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struct loop_info loopinfo;
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int i, fd, ffd, mode;
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mode = O_RDONLY;
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if ((ffd = open (file, mode)) < 0)
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return 1;
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for (i=3; i && (fd = open(device, mode)) < 0; --i, sleep(1));
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if (fd < 0) {
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close(ffd);
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return 1;
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}
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memset(&loopinfo, 0, sizeof (loopinfo));
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strncpy(loopinfo.lo_name, file, LO_NAME_SIZE);
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loopinfo.lo_name[LO_NAME_SIZE - 1] = 0;
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loopinfo.lo_offset = 0;
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#ifdef MCL_FUTURE
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/*
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* Oh-oh, sensitive data coming up. Better lock into memory to prevent
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* passwd etc being swapped out and left somewhere on disk.
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*/
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if(mlockall(MCL_CURRENT|MCL_FUTURE)) {
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log_message("CRITICAL Couldn't lock into memory! %s (memlock)", strerror(errno));
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return 1;
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}
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#endif
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if (ioctl(fd, LOOP_SET_FD, ffd) < 0) {
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close(fd);
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close(ffd);
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return 1;
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}
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if (ioctl(fd, LOOP_SET_STATUS, &loopinfo) < 0) {
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(void) ioctl (fd, LOOP_CLR_FD, 0);
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close(fd);
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close(ffd);
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return 1;
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}
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close(fd);
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close(ffd);
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return 0;
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}
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char * loopdev = "/dev/loop3"; /* Ugly. But do I care? */
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void del_loop(char *device)
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{
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int fd;
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if ((fd = open (device, O_RDONLY)) < 0)
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return;
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if (ioctl (fd, LOOP_CLR_FD, 0) < 0)
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return;
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close (fd);
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}
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static char * where_mounted = NULL;
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int
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lomount(char *loopfile, char *where)
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{
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long int flag;
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flag = MS_MGC_VAL;
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flag |= MS_RDONLY;
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my_insmod("loop", NULL);
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if (set_loop(loopdev, loopfile)) {
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log_message("set_loop failed on %s (%s)", loopdev, strerror(errno));
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return 1;
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}
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if (my_mount(loopdev, where, "iso9660", 0)) {
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del_loop(loopdev);
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return 1;
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}
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where_mounted = strdup(where);
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log_message("lomount succeeded for %s on %s", loopfile, where);
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return 0;
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}
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int
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loumount()
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{
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if (where_mounted) {
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umount(where_mounted);
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where_mounted = NULL;
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}
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del_loop(loopdev);
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return 0;
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}
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