Chapter 7 Configuring Networking 233

Features

The Force user option forces all connections that are made to the service to be made with this user name. This still requires the user to connect with a valid user name and password, but after they connect, they will be seen by the system as the forced user. Force group name does the same thing with a group account. The Don’t Descend feature is used to show directories that are not empty as empty. Take the /proc directory for example; if you don’t want users to nose around this directory, you can list it as Don’t Descend and it will appear empty to clients. The Guest account option provides the default account used for public access areas. The Max connections option is used to limit the maximum number of connections to the system at one time. If this number is zero then an unlimited number of connections are possible.

At this point, you have completed a basic configuration of Samba and you have acquired a basic knowledge of the SMB/CIFS system. Although network administrators usually configure and maintain Samba servers, the ability to work with Samba is a valuable skill.

Configuring Client Services

3.5 Configure basic client services (e.g., X client, SMB/CIFS, NIS, NFS) 3.15 Configure access rights (e.g., rlogin NIS, FTP, TFTP, SSH, Telnet)

When configuring a client, you need to configure the services that the client may use. This includes the X client, SMB/CIFS, NIS, and NFS. These services are selected during installation, but you may need to perform some of the configurations after installation.

The X client was configured in Chapters 4, 5, and 6. For more information, use the X Configuration sections in those chapters.

SMB/CIFS

The SMB/CIFS client is part of the Samba suite and can be selected during installation. This package can also be added to a system by using one of the methods discussed in Chapter 5. The SMB/CIFS client can access an SMB/CIFS/CIFS server. It offers an interface similar to that of the ftp program. The SMB/CIFS client command launches the client Table 7-2 lists the switches needed for connection. The switches are listed in order of use from closest to the command to furthest from the command; the table also includes a description of the switch for the SMB/CIFS client software.

234 Part III Configuration

Table 7-2

SMB/CIFS Client Switches

Switch	Description	Example
servicename	The service that you want to use on the	//server/service
	server in the format of a NetBIOS name.
password	The password required to access the	users password
	specified service on the specified server.
-b	This option changes the transmit/send	-b 1500
	buffer size when getting or putting a file
	from/to the server. The default is
	65520 bytes.
-d	The higher this value, the more detail	-d 1
	will be logged to the log files about the
	activities of the client, ranging from 0-10
	and A.
-D	Change to initial directory before starting.	-D /tmp
-U	Sets the SMB/CIFS username or	-U user[%password]
	username, often includes [%pass] to
	include the password.
-W	Overrides the default workgroup specified	-W usergroup
	in the workgroup parameter of the
	SMB/CIFS.conf file for this connection.
-M	This option sends messages to another	cat message.txt | SMB/CIFS
	computer by using the “WinPopup”	client -M user
	protocol.
-A	This option allows you to specify a file	-A filename
	from which to read the username and
	password used in the connection.
-N	Suppresses the normal prompt	-N
	for password.
-l	Specifies a base file name into which	-l logfilename
	operational data from the running
	client will be logged.
-L	Lists services available on a server.	-L host
-I	IP address is the address of the server to	-I 10.0.0.250
	connect to. Often used with –L.

Chapter 7 Configuring Networking 235

Switch	Description	Example
-E	Causes the client to write messages to	-E
	the standard error stream (stderr) rather
	than to the standard output stream.

-c	A command string separated by
	semicolons to be executed instead of
	prompting from stdin. -N is implied by -c.

-c command string such as -c ‘print -’

-i	This specifies a NetBIOS scope that	-i scope
	SMB/CIFS client will use to communicate
	when generating NetBIOS names.
-O	TCP socket options to set on the client	-O socket options
	socket. The SMB/CIFS.conf MAN page
	lists the valid options.
-p	This number is the TCP port number that	-p port
	will be used when making connections to
	the server instead of the standard TCP port.
-R	Name resolution order with the options	-R lmhosts
	of “lmhosts,” “host,” “wins,” and “bcast”.
-s	Provides the location of the	-s SMB/CIFS .conf
	SMB/CIFS.conf file.
-T	The SMB/CIFS client may be used to	//server/share “”
	create tar compatible backups of all the	-N -Tc backup.tar *
	files on an SMB/CIFS /CIFS share.

Know the switches but also the format for all commands used in Linux.

These switches from Table 7-3 are used to create the connection. After the connection is complete, the user is presented with a new prompt that looks like this:

SMB/CIFS :\>

This prompt indicates that the client is ready and waiting to carry out a user command. The user commands are shown in Table 7-3.

236 Part III Configuration

Table 7-3

SMB/CIFS Client Commands

Command	Description	Example
?	Used to provide information about	? [command]
	a command.
!	The ! command will execute a shell	! [shell command]
	locally and run the specified shell
	command.
cd	Used to change directories, or if no	cd [directory name]
	directory is requested, it will list the
	current directory.
del	The client will request that the server	del <mask>
	attempt to delete all files matching
	“mask” in the current directory.
dir	A list of the files matching “mask” in	dir <mask>
	the current directory will be retrieved
	and displayed.
exit	Exit the program SMB/CIFS client; this	exit
	will terminate all connections.
get	Get a remote file <name> and copy it	get <remote file name>
	to the local file [name]. This is a binary	[local file name]
	transfer.
help	Used to provide information about a	help [command]
	command.
lcd	The current working directory on the	lcd [directory name]
	local machine will be changed to the
	directory specified.
lowercase	When lowercasing is toggled ON, local	lowercase
	filenames are converted to lowercase
	when using the get and mget commands.
ls	A list of the files matching “mask” in	ls <mask>
	the current directory will be retrieved
	and displayed.
mask	This command allows the user to set up	mask <mask>
	a mask, which will be used during
	recursive operation of the mget and
	mput commands.
md	Used to create a new directory with	md <directory name>
	a specified name.

Chapter 7 Configuring Networking 237

Command	Description	Example
mget	Copy all files matching mask from the	mget <mask>
	server to the machine running the client.
mkdir	Used to create a new directory with a	mkdir <directory name>
	specified name.
mput	Copy all files matching mask from the	mput <mask>
	machine running the client to the server.
print	Print the specified file from the client	print <file name>
	through a printable service on the server.
printmode	Set the print mode to suit either binary	printmode <graphics
	data or text.	or text>
prompt	Toggle prompting for filenames during	prompt
	operation of the mget and mput
	commands.
put	Copy the file called “local file name”	put <local file name>
	from the client to the server with	[remote file name]
	optional “remote file name.”
queue	Displays the print queue, showing the	queue
	job ID, name, size, and current status.
quit	Exit the program SMB/CIFS client; this	quit
	will terminate all connections.
rd	Remove the specified directory.	rd <directory name>
recurse	Toggle directory recursion for the	recurse
	commands mget and mput.
rm	Remove all files in the current directory	rm <mask>
	with the match the <mask>.
rmdir	Remove the specified directory.	rmdir <directory name>
tar	Perform the tar operation.	tar <c|x>[IXbgNa]
blocksize	Must be followed by a valid	blocksize <blocksize>
	(greater than zero) blocksize.
	Causes tar file to be written out
	in blocksize*TBLOCK (usually 512
	byte) blocks.
tarmode	Changes tar’s behavior with regard	tarmode
	to archive bits.	<full|inc|reset|noreset>
setmode	A version of the DOS attrib command	setmode <filename>
	to set file permissions.	<perm=[+|\-]rsha>