2 Mount helper utility for Linux CIFS VFS (virtual filesystem) client
3 Copyright (C) 2003 Steve French (sfrench@us.ibm.com)
5 This program is free software; you can redistribute it and/or modify
6 it under the terms of the GNU General Public License as published by
7 the Free Software Foundation; either version 2 of the License, or
8 (at your option) any later version.
10 This program is distributed in the hope that it will be useful,
11 but WITHOUT ANY WARRANTY; without even the implied warranty of
12 MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
13 GNU General Public License for more details.
15 You should have received a copy of the GNU General Public License
16 along with this program; if not, write to the Free Software
17 Foundation, Inc., 675 Mass Ave, Cambridge, MA 02139, USA. */
27 #include <sys/types.h>
28 #include <sys/mount.h>
30 #include <sys/utsname.h>
31 #include <sys/socket.h>
32 #include <arpa/inet.h>
40 #define MOUNT_CIFS_VERSION_MAJOR "1"
41 #define MOUNT_CIFS_VERSION_MINOR "5"
43 #ifndef MOUNT_CIFS_VENDOR_SUFFIX
44 #define MOUNT_CIFS_VENDOR_SUFFIX ""
53 static int got_password
= 0;
54 static int got_user
= 0;
55 static int got_domain
= 0;
56 static int got_ip
= 0;
57 static int got_unc
= 0;
58 static int got_uid
= 0;
59 static int got_gid
= 0;
60 static int free_share_name
= 0;
61 static char * user_name
= NULL
;
62 char * mountpassword
= NULL
;
68 open nofollow - avoid symlink exposure?
69 get owner of dir see if matches self or if root
70 call system(umount argv) etc.
74 static void mount_cifs_usage(void)
76 printf("\nUsage: %s <remotetarget> <dir> -o <options>\n", thisprogram
);
77 printf("\nMount the remote target, specified as a UNC name,");
78 printf(" to a local directory.\n\nOptions:\n");
79 printf("\tuser=<arg>\n\tpass=<arg>\n\tdom=<arg>\n");
80 printf("\nLess commonly used options:");
81 printf("\n\tcredentials=<filename>,guest,perm,noperm,setuids,nosetuids,\n\trw,ro,sep=<char>,iocharset=<codepage>,suid,nosuid,exec,noexec");
82 printf("\n\nOptions not needed for servers supporting CIFS Unix extensions (e.g. most Samba versions):");
83 printf("\n\tuid=<uid>,gid=<gid>,dir_mode=<mode>,file_mode=<mode>");
84 printf("\n\nRarely used options:");
85 printf("\n\tport=<tcpport>,rsize=<size>,wsize=<size>,unc=<unc_name>,ip=<ip_address>,dev,nodev");
86 printf("\n\nOptions are described in more detail in the manual page");
87 printf("\n\tman 8 mount.cifs\n");
88 printf("\nTo display the version number of the mount helper:");
89 printf("\n\t%s -V\n",thisprogram
);
92 memset(mountpassword
,0,64);
98 /* caller frees username if necessary */
99 static char * getusername(void) {
100 char *username
= NULL
;
101 struct passwd
*password
= getpwuid(getuid());
104 username
= password
->pw_name
;
109 char * parse_cifs_url(char * unc_name
)
111 printf("\nMounting cifs URL not implemented yet. Attempt to mount %s\n",unc_name
);
115 static int open_cred_file(char * file_name
)
121 fs
= fopen(file_name
,"r");
124 line_buf
= malloc(4096);
128 while(fgets(line_buf
,4096,fs
)) {
129 /* parse line from credential file */
131 /* eat leading white space */
132 for(i
=0;i
<4086;i
++) {
133 if((line_buf
[i
] != ' ') && (line_buf
[i
] != '\t'))
135 /* if whitespace - skip past it */
137 if (strncasecmp("username",line_buf
+i
,8) == 0) {
138 temp_val
= strchr(line_buf
+ i
,'=');
140 /* go past equals sign */
142 for(length
= 0;length
<4087;length
++) {
143 if(temp_val
[length
] == '\n')
147 printf("mount.cifs failed due to malformed username in credentials file");
148 memset(line_buf
,0,4096);
150 memset(mountpassword
,0,64);
155 user_name
= calloc(1 + length
,1);
156 /* BB adding free of user_name string before exit,
157 not really necessary but would be cleaner */
158 strncpy(user_name
,temp_val
, length
);
161 } else if (strncasecmp("password",line_buf
+i
,8) == 0) {
162 temp_val
= strchr(line_buf
+i
,'=');
164 /* go past equals sign */
166 for(length
= 0;length
<65;length
++) {
167 if(temp_val
[length
] == '\n')
171 printf("mount.cifs failed: password in credentials file too long\n");
172 memset(line_buf
,0, 4096);
174 memset(mountpassword
,0,64);
178 if(mountpassword
== NULL
) {
179 mountpassword
= calloc(65,1);
181 memset(mountpassword
,0,64);
183 /* BB add handling for commas in password here */
184 strncpy(mountpassword
,temp_val
,length
);
193 memset(line_buf
,0,4096);
199 static int get_password_from_file(int file_descript
, char * filename
)
205 if(mountpassword
== NULL
)
206 mountpassword
= calloc(65,1);
208 memset(mountpassword
, 0, 64);
210 if(filename
!= NULL
) {
211 file_descript
= open(filename
, O_RDONLY
);
212 if(file_descript
< 0) {
213 printf("mount.cifs failed. %s attempting to open password file %s\n",
214 strerror(errno
),filename
);
218 /* else file already open and fd provided */
221 rc
= read(file_descript
,&c
,1);
223 printf("mount.cifs failed. Error %s reading password file\n",strerror(errno
));
224 memset(mountpassword
,0,64);
226 close(file_descript
);
229 if(mountpassword
[0] == 0) {
231 printf("\nWarning: null password used since cifs password file empty");
234 } else /* read valid character */ {
235 if((c
== 0) || (c
== '\n')) {
238 mountpassword
[i
] = c
;
241 if((i
== 64) && (verboseflag
)) {
242 printf("\nWarning: password longer than 64 characters specified in cifs password file");
245 if(filename
!= NULL
) {
246 close(file_descript
);
252 static int parse_options(char * options
, int * filesys_flags
)
255 char * percent_char
= NULL
;
257 char * next_keyword
= NULL
;
266 printf("\n parsing options: %s", options
);
268 /* while ((data = strsep(&options, ",")) != NULL) { */
269 while(data
!= NULL
) {
270 /* check if ends with trailing comma */
274 /* format is keyword=value,keyword2=value2,keyword3=value3 etc.) */
275 /* data = next keyword */
276 /* value = next value ie stuff after equal sign */
278 next_keyword
= strchr(data
,',');
280 /* temporarily null terminate end of keyword=value pair */
287 /* temporarily null terminate keyword to make keyword and value distinct */
288 if ((value
= strchr(data
, '=')) != NULL
) {
293 if (strncmp(data
, "user", 4) == 0) {
294 if (!value
|| !*value
) {
295 if(data
[4] == '\0') {
297 printf("\nskipping empty user mount parameter\n");
298 /* remove the parm since it would otherwise be confusing
299 to the kernel code which would think it was a real username */
304 /* BB remove it from mount line so as not to confuse kernel code */
306 printf("username specified with no parameter\n");
307 return 1; /* needs_arg; */
310 if (strnlen(value
, 260) < 260) {
312 percent_char
= strchr(value
,'%');
315 if(mountpassword
== NULL
)
316 mountpassword
= calloc(65,1);
319 printf("\nmount.cifs warning - password specified twice\n");
322 strncpy(mountpassword
, percent_char
,64);
323 /* remove password from username */
324 while(*percent_char
!= 0) {
331 printf("username too long\n");
335 } else if (strncmp(data
, "pass", 4) == 0) {
336 if (!value
|| !*value
) {
338 printf("\npassword specified twice, ignoring second\n");
341 } else if (strnlen(value
, 17) < 17) {
343 printf("\nmount.cifs warning - password specified twice\n");
346 printf("password too long\n");
349 } else if (strncmp(data
, "ip", 2) == 0) {
350 if (!value
|| !*value
) {
351 printf("target ip address argument missing");
352 } else if (strnlen(value
, 35) < 35) {
354 printf("ip address %s override specified\n",value
);
357 printf("ip address too long\n");
360 } else if ((strncmp(data
, "unc", 3) == 0)
361 || (strncmp(data
, "target", 6) == 0)
362 || (strncmp(data
, "path", 4) == 0)) {
363 if (!value
|| !*value
) {
364 printf("invalid path to network resource\n");
365 return 1; /* needs_arg; */
366 } else if(strnlen(value
,5) < 5) {
367 printf("UNC name too short");
370 if (strnlen(value
, 300) < 300) {
372 if (strncmp(value
, "//", 2) == 0) {
374 printf("unc name specified twice, ignoring second\n");
377 } else if (strncmp(value
, "\\\\", 2) != 0) {
378 printf("UNC Path does not begin with // or \\\\ \n");
382 printf("unc name specified twice, ignoring second\n");
387 printf("CIFS: UNC name too long\n");
390 } else if ((strncmp(data
, "domain", 3) == 0)
391 || (strncmp(data
, "workgroup", 5) == 0)) {
392 if (!value
|| !*value
) {
393 printf("CIFS: invalid domain name\n");
394 return 1; /* needs_arg; */
396 if (strnlen(value
, 65) < 65) {
399 printf("domain name too long\n");
402 } else if (strncmp(data
, "cred", 4) == 0) {
403 if (value
&& *value
) {
404 rc
= open_cred_file(value
);
406 printf("error %d opening credential file %s\n",rc
, value
);
410 printf("invalid credential file name specified\n");
413 } else if (strncmp(data
, "uid", 3) == 0) {
414 if (value
&& *value
) {
417 } else if (strncmp(data
, "gid", 3) == 0) {
418 if (value
&& *value
) {
421 /* fmask and dmask synonyms for people used to smbfs syntax */
422 } else if (strcmp(data
, "file_mode") == 0 || strcmp(data
, "fmask")==0) {
423 if (!value
|| !*value
) {
424 printf ("Option '%s' requires a numerical argument\n", data
);
428 if (value
[0] != '0') {
429 printf ("WARNING: '%s' not expressed in octal.\n", data
);
432 if (strcmp (data
, "fmask") == 0) {
433 printf ("WARNING: CIFS mount option 'fmask' is deprecated. Use 'file_mode' instead.\n");
434 data
= "file_mode"; /* BB fix this */
436 } else if (strcmp(data
, "dir_mode") == 0 || strcmp(data
, "dmask")==0) {
437 if (!value
|| !*value
) {
438 printf ("Option '%s' requires a numerical argument\n", data
);
442 if (value
[0] != '0') {
443 printf ("WARNING: '%s' not expressed in octal.\n", data
);
446 if (strcmp (data
, "dmask") == 0) {
447 printf ("WARNING: CIFS mount option 'dmask' is deprecated. Use 'dir_mode' instead.\n");
450 /* the following eight mount options should be
451 stripped out from what is passed into the kernel
452 since these eight options are best passed as the
453 mount flags rather than redundantly to the kernel
454 and could generate spurious warnings depending on the
455 level of the corresponding cifs vfs kernel code */
456 } else if (strncmp(data
, "nosuid", 6) == 0) {
457 *filesys_flags
|= MS_NOSUID
;
458 } else if (strncmp(data
, "suid", 4) == 0) {
459 *filesys_flags
&= ~MS_NOSUID
;
460 } else if (strncmp(data
, "nodev", 5) == 0) {
461 *filesys_flags
|= MS_NODEV
;
462 } else if (strncmp(data
, "dev", 3) == 0) {
463 *filesys_flags
&= ~MS_NODEV
;
464 } else if (strncmp(data
, "noexec", 6) == 0) {
465 *filesys_flags
|= MS_NOEXEC
;
466 } else if (strncmp(data
, "exec", 4) == 0) {
467 *filesys_flags
&= ~MS_NOEXEC
;
468 } else if (strncmp(data
, "guest", 5) == 0) {
470 } else if (strncmp(data
, "ro", 2) == 0) {
471 *filesys_flags
|= MS_RDONLY
;
472 } else if (strncmp(data
, "rw", 2) == 0) {
473 *filesys_flags
&= ~MS_RDONLY
;
474 } /* else if (strnicmp(data, "port", 4) == 0) {
475 if (value && *value) {
477 simple_strtoul(value, &value, 0);
479 } else if (strnicmp(data, "rsize", 5) == 0) {
480 if (value && *value) {
482 simple_strtoul(value, &value, 0);
484 } else if (strnicmp(data, "wsize", 5) == 0) {
485 if (value && *value) {
487 simple_strtoul(value, &value, 0);
489 } else if (strnicmp(data, "version", 3) == 0) {
491 printf("CIFS: Unknown mount option %s\n",data);
492 } */ /* nothing to do on those four mount options above.
493 Just pass to kernel and ignore them here */
495 /* move to next option */
496 data
= next_keyword
+1;
498 /* put overwritten equals sign back */
504 /* put previous overwritten comma back */
513 /* Note that caller frees the returned buffer if necessary */
514 char * parse_server(char ** punc_name
)
516 char * unc_name
= *punc_name
;
517 int length
= strnlen(unc_name
,1024);
519 char * ipaddress_string
= NULL
;
520 struct hostent
* host_entry
;
521 struct in_addr server_ipaddr
;
525 printf("mount error: UNC name too long");
528 if (strncasecmp("cifs://",unc_name
,7) == 0)
529 return parse_cifs_url(unc_name
+7);
530 if (strncasecmp("smb://",unc_name
,6) == 0) {
531 return parse_cifs_url(unc_name
+6);
535 /* BB add code to find DFS root here */
536 printf("\nMounting the DFS root for domain not implemented yet");
539 if(strncmp(unc_name
,"//",2) && strncmp(unc_name
,"\\\\",2)) {
540 /* check for nfs syntax ie server:share */
541 share
= strchr(unc_name
,':');
544 *punc_name
= malloc(length
+3);
546 strncpy((*punc_name
)+2,unc_name
,length
);
547 unc_name
= *punc_name
;
548 unc_name
[length
+2] = 0;
549 goto continue_unc_parsing
;
551 printf("mount error: improperly formatted UNC name.");
552 printf(" %s does not begin with \\\\ or //\n",unc_name
);
556 continue_unc_parsing
:
560 if ((share
= strchr(unc_name
, '/')) ||
561 (share
= strchr(unc_name
,'\\'))) {
562 *share
= 0; /* temporarily terminate the string */
565 host_entry
= gethostbyname(unc_name
);
567 *(share
- 1) = '/'; /* put the slash back */
570 printf("ip address specified explicitly\n");
573 if(host_entry
== NULL
) {
574 printf("mount error: could not find target server. TCP name %s not found ", unc_name
);
575 printf(" rc = %d\n",rc
);
578 /* BB should we pass an alternate version of the share name as Unicode */
579 /* BB what about ipv6? BB */
580 /* BB add retries with alternate servers in list */
582 memcpy(&server_ipaddr
.s_addr
, host_entry
->h_addr
, 4);
584 ipaddress_string
= inet_ntoa(server_ipaddr
);
585 if(ipaddress_string
== NULL
) {
586 printf("mount error: could not get valid ip address for target server\n");
589 return ipaddress_string
;
592 /* BB add code to find DFS root (send null path on get DFS Referral to specified server here */
593 printf("Mounting the DFS root for a particular server not implemented yet\n");
600 static struct option longopts
[] = {
601 { "all", 0, NULL
, 'a' },
602 { "help",0, NULL
, 'h' },
603 { "move",0, NULL
, 'm' },
604 { "bind",0, NULL
, 'b' },
605 { "read-only", 0, NULL
, 'r' },
606 { "ro", 0, NULL
, 'r' },
607 { "verbose", 0, NULL
, 'v' },
608 { "version", 0, NULL
, 'V' },
609 { "read-write", 0, NULL
, 'w' },
610 { "rw", 0, NULL
, 'w' },
611 { "options", 1, NULL
, 'o' },
612 { "type", 1, NULL
, 't' },
613 { "rsize",1, NULL
, 'R' },
614 { "wsize",1, NULL
, 'W' },
615 { "uid", 1, NULL
, '1'},
616 { "gid", 1, NULL
, '2'},
617 { "user",1,NULL
,'u'},
618 { "username",1,NULL
,'u'},
620 { "domain",1,NULL
,'d'},
621 { "password",1,NULL
,'p'},
622 { "pass",1,NULL
,'p'},
623 { "credentials",1,NULL
,'c'},
624 { "port",1,NULL
,'P'},
625 /* { "uuid",1,NULL,'U'}, */ /* BB unimplemented */
629 int main(int argc
, char ** argv
)
632 int flags
= MS_MANDLOCK
; /* no need to set legacy MS_MGC_VAL */
633 char * orgoptions
= NULL
;
634 char * share_name
= NULL
;
635 char * domain_name
= NULL
;
636 char * ipaddr
= NULL
;
640 char * resolved_path
;
651 struct utsname sysinfo
;
652 struct mntent mountent
;
655 /* setlocale(LC_ALL, "");
656 bindtextdomain(PACKAGE, LOCALEDIR);
657 textdomain(PACKAGE); */
660 thisprogram
= argv
[0];
662 if(thisprogram
== NULL
)
663 thisprogram
= "mount.cifs";
666 /* BB add workstation name and domain and pass down */
668 /* #ifdef _GNU_SOURCE
669 printf(" node: %s machine: %s sysname %s domain %s\n", sysinfo.nodename,sysinfo.machine,sysinfo.sysname,sysinfo.domainname);
672 share_name
= argv
[1];
673 mountpoint
= argv
[2];
675 /* add sharename in opts string as unc= parm */
677 while ((c
= getopt_long (argc
, argv
, "afFhilL:no:O:rsSU:vVwt:",
678 longopts
, NULL
)) != -1) {
680 /* No code to do the following options yet */
682 list_with_volumelabel = 1;
685 volumelabel = optarg;
705 orgoptions
= strdup(optarg
);
707 case 'r': /* mount readonly */
717 printf ("mount.cifs version: %s.%s%s\n",
718 MOUNT_CIFS_VERSION_MAJOR
,
719 MOUNT_CIFS_VERSION_MINOR
,
720 MOUNT_CIFS_VENDOR_SUFFIX
);
722 memset(mountpassword
,0,64);
729 rsize
= atoi(optarg
) ;
732 wsize
= atoi(optarg
);
745 domain_name
= optarg
;
748 if(mountpassword
== NULL
)
749 mountpassword
= calloc(65,1);
752 strncpy(mountpassword
,optarg
,64);
756 get_password_from_file(0 /* stdin */,NULL
);
761 printf("unknown mount option %c\n",c
);
770 if (getenv("PASSWD")) {
771 if(mountpassword
== NULL
)
772 mountpassword
= calloc(65,1);
774 strncpy(mountpassword
,getenv("PASSWD"),64);
777 } else if (getenv("PASSWD_FD")) {
778 get_password_from_file(atoi(getenv("PASSWD_FD")),NULL
);
779 } else if (getenv("PASSWD_FILE")) {
780 get_password_from_file(0, getenv("PASSWD_FILE"));
783 if (orgoptions
&& parse_options(orgoptions
, &flags
))
786 ipaddr
= parse_server(&share_name
);
787 if((ipaddr
== NULL
) && (got_ip
== 0)) {
788 printf("No ip address specified and hostname not found\n");
793 /* BB save off path and pop after mount returns? */
794 resolved_path
= malloc(PATH_MAX
+1);
796 /* Note that if we can not canonicalize the name, we get
797 another chance to see if it is valid when we chdir to it */
798 if (realpath(mountpoint
, resolved_path
)) {
799 mountpoint
= resolved_path
;
802 if(chdir(mountpoint
)) {
803 printf("mount error: can not change directory into mount target %s\n",mountpoint
);
807 if(stat (".", &statbuf
)) {
808 printf("mount error: mount point %s does not exist\n",mountpoint
);
812 if (S_ISDIR(statbuf
.st_mode
) == 0) {
813 printf("mount error: mount point %s is not a directory\n",mountpoint
);
817 if((getuid() != 0) && (geteuid() == 0)) {
818 if((statbuf
.st_uid
== getuid()) && (S_IRWXU
== (statbuf
.st_mode
& S_IRWXU
))) {
819 #ifndef CIFS_ALLOW_USR_SUID
820 /* Do not allow user mounts to control suid flag
821 for mount unless explicitly built that way */
822 flags
|= MS_NOSUID
| MS_NODEV
;
825 printf("mount error: permission denied or not superuser and mount.cifs not installed SUID\n");
831 user_name
= getusername();
833 if(got_password
== 0) {
834 mountpassword
= getpass("Password: "); /* BB obsolete */
837 /* FIXME launch daemon (handles dfs name resolution and credential change)
838 remember to clear parms and overwrite password field before launching */
840 optlen
= strlen(orgoptions
);
845 optlen
+= strlen(share_name
) + 4;
847 optlen
+= strlen(user_name
) + 6;
849 optlen
+= strlen(ipaddr
) + 4;
851 optlen
+= strlen(mountpassword
) + 6;
852 options
= malloc(optlen
+ 10);
854 if(options
== NULL
) {
855 printf("Could not allocate memory for mount options\n");
861 strncat(options
,"unc=",4);
862 strcat(options
,share_name
);
863 /* scan backwards and reverse direction of slash */
864 temp
= strrchr(options
, '/');
865 if(temp
> options
+ 6)
868 strncat(options
,",ip=",4);
869 strcat(options
,ipaddr
);
872 strncat(options
,",user=",6);
873 strcat(options
,user_name
);
876 strncat(options
,",pass=",6);
877 strcat(options
,mountpassword
);
879 strncat(options
,",ver=",5);
880 strcat(options
,MOUNT_CIFS_VERSION_MAJOR
);
884 strcat(options
,orgoptions
);
887 printf("\nmount.cifs kernel mount options %s \n",options
);
888 if(mount(share_name
, mountpoint
, "cifs", flags
, options
)) {
889 /* remember to kill daemon on error */
892 printf("mount failed but no error number set\n");
895 printf("mount error: cifs filesystem not supported by the system\n");
898 printf("mount error %d = %s\n",errno
,strerror(errno
));
900 printf("Refer to the mount.cifs(8) manual page (e.g.man mount.cifs)\n");
902 memset(mountpassword
,0,64);
906 pmntfile
= setmntent(MOUNTED
, "a+");
908 mountent
.mnt_fsname
= share_name
;
909 mountent
.mnt_dir
= mountpoint
;
910 mountent
.mnt_type
= "cifs";
911 mountent
.mnt_opts
= malloc(220);
912 if(mountent
.mnt_opts
) {
913 char * mount_user
= getusername();
914 memset(mountent
.mnt_opts
,0,200);
915 if(flags
& MS_RDONLY
)
916 strcat(mountent
.mnt_opts
,"ro");
918 strcat(mountent
.mnt_opts
,"rw");
919 if(flags
& MS_MANDLOCK
)
920 strcat(mountent
.mnt_opts
,",mand");
922 strcat(mountent
.mnt_opts
,",nomand");
923 if(flags
& MS_NOEXEC
)
924 strcat(mountent
.mnt_opts
,",noexec");
925 if(flags
& MS_NOSUID
)
926 strcat(mountent
.mnt_opts
,",nosuid");
928 strcat(mountent
.mnt_opts
,",nodev");
929 if(flags
& MS_SYNCHRONOUS
)
930 strcat(mountent
.mnt_opts
,",synch");
933 strcat(mountent
.mnt_opts
,",user=");
934 strcat(mountent
.mnt_opts
,mount_user
);
939 mountent
.mnt_freq
= 0;
940 mountent
.mnt_passno
= 0;
941 rc
= addmntent(pmntfile
,&mountent
);
943 if(mountent
.mnt_opts
)
944 free(mountent
.mnt_opts
);
946 printf("could not update mount table\n");
950 memset(mountpassword
,0,64);
955 memset(options
,0,optlen
);
960 memset(orgoptions
,0,orgoptlen
);
967 if(free_share_name
) {
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