asp.net scan barcode android Figure 33-5: CUPS Web interface in Software

Maker QR Code ISO/IEC18004 in Software Figure 33-5: CUPS Web interface

Figure 33-5: CUPS Web interface
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You install a printer on CUPS through a series of Web pages, each requesting different information. To install a printer, click on the Add Printer button to display a page where you enter the printer name and location. The location is the host to which the printer is connected. In Figure 33-6 the myepson printer is connected to the host turtle.mytrek.com.
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Figure 33-6: CUPS Add New Printer page Subsequent pages will prompt you to enter the model of the printer and driver. These you select from available listings. Once you have added the printer you can configure it. Clicking the Manage Printers entry in the Administration page will list your installed printers. You can then click a printer to display a page that will let you control the printer. You can stop the printer, configure its printing, modify its installation, and even delete the printer. Clicking the Configure Printer button will display a page where you can configure how your printer prints, specifying the resolution or paper size. The printer entry will be displayed as shown in Figure 33-7.
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Figure 33-7: CUPS printer entry Note You can perform all administrative tasks from the command line using the lpadmin command. See the CUPS documentation for more details. To install a remote printer that is attached to a Windows system or another Linux system running LPRng or LPD, you specify its location using special URL protocols. For a Windows printer, you will first need to install, configure, and run Samba. CUPS uses Samba to access Windows printers. When installing the Windows printer on CUPS, you specify its location using the URL protocol smb. The user allowed to log on to the printer is entered before the
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host name and separated by the @ sign. On most configurations this is the guest user. The location entry for a Windows printer called myhp attached to a Windows host named lizard is shown here. Its Samba share reference would be //lizard/myhp.
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smb://guest@lizard/myhp
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To enable Samba on CUPS, you will also have to set the printing option in the /etc/cups/cupsd.conf file to Samba, as shown here.
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printing = samba
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You will also have to link the smbspool directory to the CUPS smb spool directory.
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ln s 'which smbspool` /usr/cups/backend/smb
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To access a printer connected to a Linux or Unix system running LPRng, you would use the protocol lpd when specifying its location. In the following example, the printer mylaser is connected to the Linux host rabbit.
lpd://rabbit.mytrek.com/mylaser
CUPS features a way to let you select a group of printers to print a job instead of selecting just one. That way, if one printer is busy or down, another printer can be automatically selected to perform the job. Such groupings of printers are called classes. Once you have installed your printers you can then group them into different classes. For example, you may want to group all inkjet printers in one class and lasers in another. Or you might want to group printers connected to a printer server in their own class. To create a class, select Classes on the Administration page, and enter the name of the class. You can then add printers to it. CUPS configuration files will be placed in the /etc/cups directory. They are listed in Table 33-7. The classes.conf, printers.conf, and client.conf files can be managed by the Web interface. In the printers.conf file, you will see the configuration information for the different printers you have installed. Any of these files can be edited manually, if you wish. Table 33-7: CUPS Configuration Files Description Configurations for different printer classes. Lists specific option for specified clients. Configures the CUPS server, cupsd. Printer configurations.
Filename classes.conf client.conf cupsd.conf printers.conf
The CUPS server is configured with the cupsd.conf file. Configuration options have to be manually edited. The server is not configured with the Web interface. Your installation of CUPS will install a commented version of the cupsd.conf file, with each option listed, although mostly commented out. Commented lines are preceded with a # symbol and each option is documented in detail. The server configuration uses an Apache Web server syntax consisting of a set of directives. As with Apache, several of these directives can group other directives into blocks.
Certain directives allow access controls to be placed on specific locations. These can be printers or resources such as the administrative tool or the spool directories. Location controls are implemented with the Location directive. Allow From and Deny From directives can deny or permit access from specific hosts. CUPS supports both Basic and Digest forms of authentication, specified in the AuthType directive. Basic authentication uses a user and password. For example, to use the Web interface, you were prompted to enter the root user and the root user password. Digest authentication makes use of user and password information kept in the CUPS /etc/cups/passwd.md5 file, using MD5 versions of a user and password for authentication. The AuthClass specifies the class allowed access. The System class include the root, sys, and system users. The following example shows the Location directive for the /admin resource, the administrative tool.
<Location /admin> AuthType Basic AuthClass System ## Restrict access to local domain Order Deny,Allow Deny From All Allow From 127.0.0.1 #Encryption Required </Location>
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