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GNU/Linux |
RedHat 5.2(Apollo) |
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smbmount(8) |
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smbmount − mount program for smbfs
smbmount servicename mount-point [ -h ] [ -C ] [ -n ] [ -P password ] [ -s server name ] [ -c client name ] [ -I hostname/IP ] [ -U user name ] [ -D domain name ] [ -u uid ] [ -g gid ] [ -f file mode ] [ -d dir mode ] [ -m max xmit ] [ -p port ]
This program is an interface to the SMB filesystem.
smbfs is a filesystem which understands the SMB protocol. This is the protocol Windows for Workgroups, Windows NT or Lan Manager use to talk to each other. It was inspired by samba, the program by Andrew Tridgell that turns any unix site into a file server for DOS or Windows clients. See ftp://nimbus.anu.edu.au/pub/tridge/samba/ for this interesting program suite and lots of more information on SMB and NetBIOS over TCP/IP. There you also find explanation for conceps like netbios name or share.
servicename
servicename is the name of the service you want to use on the server. It takes the form //server/service/rootdir where server is the name of the Lan Manager server offering the desired service and service is the name of the service offered. rootdir is a directory below the offered service. This can be convenient when complete disks are exported by a server, but only a small part of the hierarchy should be available for the client. Thus to connect to the directory "util" below the service "c" on the Lan Manager server "wfw", you would use the servicename
//wfw/c/util
Note that the notation is different from the DOS conventions, where the same service would be given as \\wfw\c\util. This was done to get rid of difficulties with the shell using \ as an escape character.
To make smbmount compatible with the automounter, only one leading ’/’ is required, although any number of ’/’s is accepted.
Currently smbmount uses gethostbyname() to find the IP number of the desired host. It is thus not really compatible with Lan Manager conventions, where the netbios name of the server is not necessarily the same as the hostname. In environments which enforce a netbios name that’s different than the hostname, you should use -s and -c to simulate appropriate behaviour.
mount-point
mount-point is the directory you want to mount the filesystem over. It’s the same as in the normal mount command.
If the real uid of the caller is not root, smbmount checks whether the user is allowed to mount a filesystem on the mount-point. So it should be safe to make smbmount setuid root. In the filesystem, the real uid of the caller is stored, so that smbumount can check whether the caller is allowed to unmount the filesystem.
-h
-h is used to print out a short help text.
-C
By default, passwords are converted to uppercase before they are sent to the server, because most servers require this. You can turn off this conversion by -C.
-n
-n should be given to mount shares which do not require a password to log in.
-P password
You may want to give the password required by the server on the command line. You should be careful to use passwords in scripts.
If neither -n nor -P are given, smbmount prompts for a password. This makes it difficult to use in scripts such as /etc/rc. But that’s not smbmount’s fault, but a general problem with the Lan Manager security model. If anybody has a satisfying solution to this problem, please tell me.
-s server name
If the server has a different netbios name than its hostname, you should give its netbios name by -s. This option should only be used if the server refuses your login attempt without telling him about his netbios name.
This option does not alter the way smbmount finds the server’s IP address. It always uses gethostbyname().
The default value for this option is the server name given in the service.
-c client name
Like -s, -c should be used when netbios names and hostnames differ and the server refuses login with the default value for the netbios name: your hostname.
-I hostname/IP of the server
Like -c should be used when netbios names and hostnames differ on the server. This sets the hostname to contact on the network, the netbios name of the server still preceeds the service name.
-U user name
If the user name you Lan Manager administrator gave to you differs from your unix user-id, you should use -U to tell the server about you Lan Manager user name.
-D domain name
If your server requires a domain name at login time, you can use -D to specify it. The default value is ’?’, which should work fine for most setups. Please note that your kernel has to support this feature.
-u uid, -g gid
A Lan Manager server does not tell us anything about the owner of a file. Unix requires that each file has an owner and a group it belongs to. With -u and -g you can tell smbmount which id’s it should assign to the files in the mounted direcory.
The defaults for these values are the current uid and gid.
-f file mode, -d dir mode
Like -u and -g, these options are also used to bridge differences in concepts between Lan Manager and unix. Lan Manager does not know anything about file permissions. So smbmount has to be told which permissions it should assign to the mounted files and direcories. The values have to be given as octal numbers. The default values are taken from the current umask, where the file mode is the current umask, and the dir mode adds execute permissions where the file mode gives read permissions.
Note that these permissions can differ from the rights the server gives to us. If you do not have write permissions on the server, you can very well choose a file mode that tells that you have. This certainly cannot override the restrictions imposed by the server.
-p port
The port is the TCP port smbmount tries to connect on the server. The default for this value is 139, as specified in RFC 1001/1002 (NetBIOS over TCP/IP). Normally it should not be altered, as all commercial servers offer their services on this port.
I use it in my testing environment, where samba runs as a normal user and cannot bind() to the privileged port 139.
-m max xmit
With -m you can tell smbmount that it should offer some special maximum packet size that it can transfer in one SMB packet. Normally this option should not be used.
The mount(2) system call does not return any sensible error code, so you have to guess what failed when you could not mount a share.
Some servers are fussy about the case of supplied usernames, passwords, share names (aka service names) and machine names. If you fail to connect try giving all parameters in uppercase.
It is often necessary to use the -n option when connecting to some types of servers. For example OS/2 LanManager insists on a valid netbios name being used, so you need to supply a valid name that would be known to the server.
Starting with smbfs-0.8 it is possible that your smbmount program is newer than the kernel you are currently using. You can fix this by recompiling smbmount with the correct kernel sources installed.
smbfs supports long file names where the server supports the LANMAN2 protocol.
USER / LOGNAME
The variables USER or LOGNAME may contain the username of the person using the client. USER is tried first. If it’s emtpy, LOGNAME is tried. This information is used only if the protocol level is high enough to support session-level passwords.
Most diagnostics issued by smbfs are logged by syslogd. Normally nothing is printed, only error situations are logged there.
If you have problems with smbfs, a good diagnostic tool is the program smbclient from the samba package. If your problem does not occur with smbclient, then it’s definitely a problem with smbfs. If smbclient also shows the problem, it can print lots of debugging information to help you to find the problem.
make does not find the Makefile in a smb-mounted direcory. Why??? If you type make -f Makefile, everything works fine.
There might be lots of race conditions in the kernel code. Anybody more experienced in kernel hacking might take a look at it and tell me about problems. I will do my best. For example I do not know which routines smbfs calls in the kernel might call schedule(). Can kmalloc call the scheduler? Does kfree?
You might see the use of gethostbyname() to find the server in a way not conforming to Lan Manager as a bug.
syslogd(8), smbumount(8)
The original smbfs kernel code was a mixture of user-level smbfs and the nfs code. It was put together by Paal-Kr. Engstad (pke@engstad.ingok.hitos.no) and later polished by Volker Lendecke (lendecke@namu01.gwdg.de)
The original Samba software and related utilities were created by Andrew Tridgell (Andrew.Tridgell@anu.edu.au).
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smbmount(8) | |