diff options
Diffstat (limited to 'source4/client/smbmnt.c')
| -rw-r--r-- | source4/client/smbmnt.c | 306 |
1 files changed, 306 insertions, 0 deletions
diff --git a/source4/client/smbmnt.c b/source4/client/smbmnt.c new file mode 100644 index 0000000000..ce406179cf --- /dev/null +++ b/source4/client/smbmnt.c @@ -0,0 +1,306 @@ +/* + * smbmnt.c + * + * Copyright (C) 1995-1998 by Paal-Kr. Engstad and Volker Lendecke + * extensively modified by Tridge + * + */ + +#include "includes.h" + +#include <mntent.h> +#include <sys/utsname.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 uid_t mount_uid; +static gid_t mount_gid; +static int mount_ro; +static unsigned mount_fmask; +static unsigned mount_dmask; +static int user_mount; +static char *options; + +static void +help(void) +{ + printf("\n"); + printf("Usage: smbmnt mount-point [options]\n"); + printf("Version %s\n\n",VERSION); + printf("-s share share name on server\n" + "-r mount read-only\n" + "-u uid mount as uid\n" + "-g gid mount as gid\n" + "-f mask permission mask for files\n" + "-d mask permission mask for directories\n" + "-o options name=value, list of options\n" + "-h print this help text\n"); +} + +static int +parse_args(int argc, char *argv[], struct smb_mount_data *data, char **share) +{ + int opt; + + while ((opt = getopt (argc, argv, "s:u:g:rf:d:o:")) != EOF) + { + switch (opt) + { + case 's': + *share = optarg; + break; + case 'u': + if (!user_mount) { + mount_uid = strtol(optarg, NULL, 0); + } + break; + case 'g': + if (!user_mount) { + mount_gid = strtol(optarg, NULL, 0); + } + break; + case 'r': + mount_ro = 1; + break; + case 'f': + mount_fmask = strtol(optarg, NULL, 8); + break; + case 'd': + mount_dmask = strtol(optarg, NULL, 8); + break; + case 'o': + options = 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) { + fprintf(stderr,"Failed to find real path for mount point\n"); + exit(1); + } + return strdup(path); +} + +/* Check whether user is allowed to mount on the specified mount point. If it's + OK then we change into that directory - this prevents race conditions */ +static int mount_ok(char *mount_point) +{ + struct stat st; + + if (chdir(mount_point) != 0) { + return -1; + } + + if (stat(".", &st) != 0) { + return -1; + } + + 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; +} + +/* Tries to mount using the appropriate format. For 2.2 the struct, + for 2.4 the ascii version. */ +static int +do_mount(char *share_name, unsigned int flags, struct smb_mount_data *data) +{ + pstring opts; + struct utsname uts; + char *release, *major, *minor; + char *data1, *data2; + + uname(&uts); + release = uts.release; + major = strtok(release, "."); + minor = strtok(NULL, "."); + if (major && minor && atoi(major) == 2 && atoi(minor) < 4) { + /* < 2.4, assume struct */ + data1 = (char *) data; + data2 = opts; + } else { + /* >= 2.4, assume ascii but fall back on struct */ + data1 = opts; + data2 = (char *) data; + } + + slprintf(opts, sizeof(opts)-1, + "version=7,uid=%d,gid=%d,file_mode=0%o,dir_mode=0%o,%s", + data->uid, data->gid, data->file_mode, data->dir_mode,options); + if (mount(share_name, ".", "smbfs", flags, data1) == 0) + return 0; + return mount(share_name, ".", "smbfs", flags, data2); +} + + int main(int argc, char *argv[]) +{ + char *mount_point, *share_name = NULL; + FILE *mtab; + int fd; + unsigned int flags; + struct smb_mount_data data; + struct mntent ment; + + memset(&data, 0, sizeof(struct smb_mount_data)); + + if (argc < 2) { + help(); + exit(1); + } + + if (argv[1][0] == '-') { + help(); + exit(1); + } + + if (getuid() != 0) { + user_mount = 1; + } + + if (geteuid() != 0) { + fprintf(stderr, "smbmnt must be installed suid root for direct user mounts (%d,%d)\n", getuid(), geteuid()); + exit(1); + } + + mount_uid = getuid(); + mount_gid = getgid(); + mount_fmask = umask(0); + umask(mount_fmask); + mount_fmask = ~mount_fmask; + + mount_point = fullpath(argv[1]); + + argv += 1; + argc -= 1; + + if (mount_ok(mount_point) != 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(); + + if (parse_args(argc, argv, &data, &share_name) != 0) { + help(); + return -1; + } + + data.uid = mount_uid; + data.gid = mount_gid; + data.file_mode = (S_IRWXU|S_IRWXG|S_IRWXO) & mount_fmask; + data.dir_mode = (S_IRWXU|S_IRWXG|S_IRWXO) & mount_dmask; + + if (mount_dmask == 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_ro) flags |= MS_RDONLY; + + if (do_mount(share_name, flags, &data) < 0) { + switch (errno) { + case ENODEV: + fprintf(stderr, "ERROR: smbfs filesystem not supported by the kernel\n"); + break; + default: + perror("mount error"); + } + fprintf(stderr, "Please refer to the smbmnt(8) manual page\n"); + return -1; + } + + ment.mnt_fsname = share_name ? share_name : "none"; + ment.mnt_dir = 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; +} |