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/*
* smbmount.c
*
* Copyright (C) 1995-1998 by Paal-Kr. Engstad and Volker Lendecke
*
*/
#include "includes.h"
#include <mntent.h>
#include <asm/types.h>
#include <asm/posix_types.h>
#include <linux/smb.h>
#include <linux/smb_mount.h>
#include <asm/unistd.h>
#ifndef MS_MGC_VAL
/* This may look strange but MS_MGC_VAL is what we are looking for and
is what we need from <linux/fs.h> under libc systems and is
provided in standard includes on glibc systems. So... We
switch on what we need... */
#include <linux/fs.h>
#endif
static void
help(void)
{
printf("\n");
printf("usage: smbmnt mount-point [options]\n");
printf("-s share share name on server\n"
"-h print this help text\n");
}
static int
parse_args(int argc, char *argv[], struct smb_mount_data *data, char **share)
{
int opt;
struct passwd *pwd;
struct group *grp;
while ((opt = getopt (argc, argv, "s:")) != EOF)
{
switch (opt)
{
case 's':
*share = optarg;
break;
default:
return -1;
}
}
return 0;
}
static char *
fullpath(const char *p)
{
char path[MAXPATHLEN];
if (strlen(p) > MAXPATHLEN-1)
{
return NULL;
}
if (realpath(p, path) == NULL)
{
return strdup(p);
}
return strdup(path);
}
/* Check whether user is allowed to mount on the specified mount point */
static int mount_ok(SMB_STRUCT_STAT *st)
{
if (!S_ISDIR(st->st_mode)) {
errno = ENOTDIR;
return -1;
}
if ((getuid() != 0) &&
((getuid() != st->st_uid) ||
((st->st_mode & S_IRWXU) != S_IRWXU))) {
errno = EPERM;
return -1;
}
return 0;
}
int main(int argc, char *argv[])
{
char *mount_point, *share_name = NULL;
FILE *mtab;
int fd, um;
unsigned int flags;
struct smb_mount_data data;
SMB_STRUCT_STAT st;
struct mntent ment;
memset(&data, 0, sizeof(struct smb_mount_data));
if (argv[1][0] == '-') {
help();
exit(1);
}
if (geteuid() != 0) {
fprintf(stderr, "smbmnt must be installed suid root\n");
exit(1);
}
if (argc < 2) {
help();
exit(1);
}
mount_point = argv[1];
argv += 1;
argc -= 1;
if (sys_stat(mount_point, &st) == -1) {
fprintf(stderr, "could not find mount point %s: %s\n",
mount_point, strerror(errno));
exit(1);
}
if (mount_ok(&st) != 0) {
fprintf(stderr, "cannot mount on %s: %s\n",
mount_point, strerror(errno));
exit(1);
}
data.version = SMB_MOUNT_VERSION;
/* getuid() gives us the real uid, who may umount the fs */
data.mounted_uid = getuid();
data.uid = getuid();
data.gid = getgid();
um = umask(0);
umask(um);
data.file_mode = (S_IRWXU|S_IRWXG|S_IRWXO) & ~um;
data.dir_mode = 0;
if (parse_args(argc, argv, &data, &share_name) != 0) {
help();
return -1;
}
if (data.dir_mode == 0) {
data.dir_mode = data.file_mode;
if ((data.dir_mode & S_IRUSR) != 0)
data.dir_mode |= S_IXUSR;
if ((data.dir_mode & S_IRGRP) != 0)
data.dir_mode |= S_IXGRP;
if ((data.dir_mode & S_IROTH) != 0)
data.dir_mode |= S_IXOTH;
}
flags = MS_MGC_VAL;
if (mount(share_name, mount_point, "smbfs", flags, (char *)&data) < 0)
{
perror("mount error");
printf("Please refer to the smbmnt(8) manual page\n");
return -1;
}
ment.mnt_fsname = share_name ? share_name : "none";
ment.mnt_dir = fullpath(mount_point);
ment.mnt_type = "smbfs";
ment.mnt_opts = "";
ment.mnt_freq = 0;
ment.mnt_passno= 0;
mount_point = ment.mnt_dir;
if (mount_point == NULL)
{
fprintf(stderr, "Mount point too long\n");
return -1;
}
if ((fd = open(MOUNTED"~", O_RDWR|O_CREAT|O_EXCL, 0600)) == -1)
{
fprintf(stderr, "Can't get "MOUNTED"~ lock file");
return 1;
}
close(fd);
if ((mtab = setmntent(MOUNTED, "a+")) == NULL)
{
fprintf(stderr, "Can't open " MOUNTED);
return 1;
}
if (addmntent(mtab, &ment) == 1)
{
fprintf(stderr, "Can't write mount entry");
return 1;
}
if (fchmod(fileno(mtab), 0644) == -1)
{
fprintf(stderr, "Can't set perms on "MOUNTED);
return 1;
}
endmntent(mtab);
if (unlink(MOUNTED"~") == -1)
{
fprintf(stderr, "Can't remove "MOUNTED"~");
return 1;
}
return 0;
}
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