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/*
* losetup.c - setup and control loop devices
*/
/* 1999-02-22 Arkadiusz Mi¶kiewicz <misiek@misiek.eu.org>
* - added Native Language Support
*/
#include <stdio.h>
#include <string.h>
#include <ctype.h>
#include <fcntl.h>
#include <unistd.h>
#include <getopt.h>
#include <errno.h>
#include <sys/ioctl.h>
#include "loop.h"
#include "lomount.h"
#include "nls.h"
#ifdef LOOP_SET_FD
static char *progname;
struct crypt_type_struct {
int id;
char *name;
} crypt_type_tbl[] = {
{ LO_CRYPT_NONE,"no" },
{ LO_CRYPT_NONE,"none" },
{ LO_CRYPT_XOR, "xor" },
{ LO_CRYPT_DES, "DES" },
{ -1, NULL }
};
static char *crypt_name(int id)
{
int i;
for (i = 0; crypt_type_tbl[i].id != -1; i++)
if (id == crypt_type_tbl[i].id)
return crypt_type_tbl[i].name;
return "undefined";
}
static int crypt_type(const char *name)
{
int i;
for (i = 0; crypt_type_tbl[i].id != -1; i++)
if (!strcasecmp(name, crypt_type_tbl[i].name))
return crypt_type_tbl[i].id;
return -1;
}
static void show_loop(const char *device)
{
struct loop_info loopinfo;
int fd;
if ((fd = open(device, O_RDWR)) < 0) {
perror(device);
return;
}
if (ioctl(fd, LOOP_GET_STATUS, &loopinfo) < 0) {
perror(_("Cannot get loop info"));
close(fd);
return;
}
printf(_("%s: [%04x]:%ld (%s) offset %d, %s encryption\n"),
device, loopinfo.lo_device, loopinfo.lo_inode,
loopinfo.lo_name, loopinfo.lo_offset,
crypt_name(loopinfo.lo_encrypt_type));
close(fd);
}
int set_loop(const char *device, const char *file, int offset,
const char *encryption, int *loopro)
{
struct loop_info loopinfo;
int fd, ffd, mode, i;
char *pass;
mode = *loopro ? O_RDONLY : O_RDWR;
if ((ffd = open (file, mode)) < 0 && !*loopro
&& (errno != EROFS || (ffd = open (file, mode = O_RDONLY)) < 0)) {
perror (file);
return 1;
}
if ((fd = open (device, mode)) < 0) {
perror (device);
return 1;
}
*loopro = (mode == O_RDONLY);
memset(&loopinfo, 0, sizeof(loopinfo));
strncpy(loopinfo.lo_name, file, LO_NAME_SIZE);
loopinfo.lo_name[LO_NAME_SIZE-1] = 0;
if (encryption && (loopinfo.lo_encrypt_type = crypt_type(encryption))
< 0) {
fprintf(stderr,_("Unsupported encryption type %s\n"),encryption);
exit(1);
}
loopinfo.lo_offset = offset;
switch (loopinfo.lo_encrypt_type) {
case LO_CRYPT_NONE:
loopinfo.lo_encrypt_key_size = 0;
break;
case LO_CRYPT_XOR:
pass = getpass(_("Password: "));
strncpy(loopinfo.lo_encrypt_key, pass, LO_KEY_SIZE);
loopinfo.lo_encrypt_key[LO_KEY_SIZE-1] = 0;
loopinfo.lo_encrypt_key_size = strlen(loopinfo.lo_encrypt_key);
break;
case LO_CRYPT_DES:
pass = getpass(_("Password: "));
strncpy(loopinfo.lo_encrypt_key, pass, 8);
loopinfo.lo_encrypt_key[8] = 0;
loopinfo.lo_encrypt_key_size = 8;
pass = getpass(_("Init (up to 16 hex digits): "));
for (i = 0; i < 16 && pass[i]; i++)
if (isxdigit(pass[i]))
loopinfo.lo_init[i >> 3] |= (pass[i] > '9' ?
(islower(pass[i]) ? toupper(pass[i]) :
pass[i])-'A'+10 : pass[i]-'0') << (i & 7)*4;
else {
fprintf(stderr,_("Non-hex digit '%c'.\n"),pass[i]);
exit(1);
}
break;
default:
fprintf(stderr,
_("Don't know how to get key for encryption system %d\n"),
loopinfo.lo_encrypt_type);
exit(1);
}
if (ioctl(fd, LOOP_SET_FD, ffd) < 0) {
perror("ioctl: LOOP_SET_FD");
exit(1);
}
if (ioctl(fd, LOOP_SET_STATUS, &loopinfo) < 0) {
(void) ioctl(fd, LOOP_CLR_FD, 0);
perror("ioctl: LOOP_SET_STATUS");
exit(1);
}
close(fd);
close(ffd);
return 0;
}
int del_loop(const char *device)
{
int fd;
if ((fd = open(device, O_RDONLY)) < 0) {
perror(device);
exit(1);
}
if (ioctl(fd, LOOP_CLR_FD, 0) < 0) {
perror("ioctl: LOOP_CLR_FD");
exit(1);
}
return(0);
}
static int usage(void)
{
fprintf(stderr, _("usage:\n\
%s loop_device # give info\n\
%s -d loop_device # delete\n\
%s [ -e encryption ] [ -o offset ] loop_device file # setup\n"),
progname, progname, progname);
exit(1);
}
int main(int argc, char **argv)
{
char *offset,*encryption;
int delete,off,c;
int ro = 0;
setlocale(LC_ALL, "");
bindtextdomain(PACKAGE, LOCALEDIR);
textdomain(PACKAGE);
delete = off = 0;
offset = encryption = NULL;
progname = argv[0];
while ((c = getopt(argc,argv,"de:o:")) != EOF) {
switch (c) {
case 'd':
delete = 1;
break;
case 'e':
encryption = optarg;
break;
case 'o':
offset = optarg;
break;
default:
usage();
}
}
if (argc == 1) usage();
if ((delete && (argc != optind+1 || encryption || offset)) ||
(!delete && (argc < optind+1 || argc > optind+2)))
usage();
if (argc == optind+1) {
if (delete)
del_loop(argv[optind]);
else
show_loop(argv[optind]);
} else {
if (offset && sscanf(offset,"%d",&off) != 1)
usage();
set_loop(argv[optind],argv[optind+1],off,encryption,&ro);
}
return 0;
}
#else /* LOOP_SET_FD not defined */
int main(int argc, char **argv) {
fprintf(stderr,
_("No loop support was available at compile time. Please recompile.\n"));
return -1;
}
#endif
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