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/*
* smbmount.c
*
* Copyright (C) 1995, 1996 by Paal-Kr. Engstad and Volker Lendecke
*
*/
#include <stdio.h>
#include <string.h>
#include <signal.h>
#include <pwd.h>
#include <grp.h>
#include <sys/socket.h>
#include <sys/param.h>
#include <netinet/in.h>
#include <netdb.h>
#include <sys/stat.h>
#include <sys/types.h>
/* #include <sys/wait.h> */ /* generates a warning here */
extern pid_t waitpid(pid_t, int *, int);
#include <sys/errno.h>
#include <unistd.h>
#include <fcntl.h>
#include <errno.h>
#include <ctype.h>
#include <stdlib.h>
#include <sys/mount.h>
#include <mntent.h>
#include <linux/fs.h>
#include <linux/smb.h>
#include <linux/smb_mount.h>
#include <asm/unistd.h>
static char *progname;
static void
usage(void)
{
printf("usage: %s mount-point [options]\n", progname);
printf("Try `%s -h' for more information\n", progname);
}
static void
help(void)
{
printf("\n");
printf("usage: %s mount-point [options]\n", progname);
printf("-u uid uid the mounted files get\n"
"-g gid gid the mounted files get\n"
"-f mode permission the files get (octal notation)\n"
"-d mode permission the dirs get (octal notation)\n"
"-P pid connection handler's pid\n\n"
"-h print this help text\n");
}
static int
parse_args(int argc, char *argv[], struct smb_mount_data *data)
{
int opt;
struct passwd *pwd;
struct group *grp;
while ((opt = getopt (argc, argv, "u:g:f:d:"))
!= EOF)
{
switch (opt)
{
case 'u':
if (isdigit(optarg[0]))
{
data->uid = atoi(optarg);
}
else
{
pwd = getpwnam(optarg);
if (pwd == NULL)
{
fprintf(stderr, "Unknown user: %s\n",
optarg);
return 1;
}
data->uid = pwd->pw_uid;
}
break;
case 'g':
if (isdigit(optarg[0]))
{
data->gid = atoi(optarg);
}
else
{
grp = getgrnam(optarg);
if (grp == NULL)
{
fprintf(stderr, "Unknown group: %s\n",
optarg);
return 1;
}
data->gid = grp->gr_gid;
}
break;
case 'f':
data->file_mode = strtol(optarg, NULL, 8);
break;
case 'd':
data->dir_mode = strtol(optarg, NULL, 8);
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(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[])
{
struct smb_mount_data data;
struct stat st;
int fd;
int um;
unsigned int flags;
char *mount_point;
struct mntent ment;
FILE *mtab;
progname = argv[0];
memset(&data, 0, sizeof(struct smb_mount_data));
if ( (argc == 2)
&& (argv[1][0] == '-')
&& (argv[1][1] == 'h')
&& (argv[1][2] == '\0'))
{
help();
return 0;
}
if (geteuid() != 0) {
fprintf(stderr, "%s must be installed suid root\n", progname);
exit(1);
}
if (argc < 2)
{
usage();
return 1;
}
mount_point = argv[1];
argv += 1;
argc -= 1;
if (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) != 0) {
usage();
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(NULL, mount_point, "smbfs",
flags, (char *)&data) < 0) {
perror("mount error");
printf("Please look at smbmount's manual page for "
"possible reasons\n");
return -1;
}
ment.mnt_fsname = "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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