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Services, Directories, and Applications
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User-defined rule sets can occupy S6 and above. For example, ruleset 33 is defined in Solaris to support Sun s RemoteMode. A typical sendmail rule takes the form
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Rlhs rhs description
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where R indicates that the line is a rule, lhs is the left-hand side of the rule, rhs is the right-hand side of the rule, and description is a comment that is useful for humans to interpret what action the rule performs. The left-hand side is a specification for matching a particular mail header, while the right-hand side specifies the action to be taken if a match is found for the rule. Just as lex, yacc, and JavaCC can be used to specify actions based on matched tokens, so does the sendmail parser. When the sendmail.cf file is parsed by sendmail, it recognizes several specifiers on the left-hand side: $ $+ Matches a single token. Matches any number of tokens greater than zero. Matches any token equal to character.
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$* Matches any number of tokens, including zero tokens. $=character
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If any rule stated using these specifiers finds a match, then one or more actions may be performed by one or more right-hand side specifiers: $@ Rewrite-and-return. $>integer Rewrite using the rule set specified by integer. $# Deliver through the specified mailer. $character and $integer Actions can be performed on variables defined on the left-hand side. As an example, consider a rule that adds an FQDN onto a mail servermail, where a message is destined for external delivery. In this case, $h (host) is set to mail and $d (domain) is set to companyA.com. Thus, a rule to match a username with no FQDN specified would be
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R$+ $@$1<@$h.$d> Add a FQDN to username
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Thus, any valid Solaris username like pwatters will have mail, a dot ( . ), and companyA.com appended to it for external delivery, giving:
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paul<@mail.companyA.com>
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A more complex rule for a more complex organization that has multiple internal networks might have a second level in the FQDN above the company name (for
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27:
Sendmail
example, the mail server for the sales department of companyA.com would have the FQDN mail.sales.companyA.com). In this case, you define $o (organization level), set $o to sales, and change the rule to
R$+ $@$1<@$h.$o.$d> Add a FQDN to username, including organization level
Hence, any valid Solaris username like neil will have mail, a dot (.), sales, another dot, and companyA.com appended to it for external delivery:
neil<@mail.sales.companyA.com>
Thus, the combination of rules, macros, and options can successfully create and resolve most e-mail addresses. If all of the rule writing and option setting seems daunting to a first-time sendmail administrator, it is possible to use GUI-based configuration tools to ease the burden. One of the easiest ways to run and configure sendmail is to use webmin, which is freely available at http://www.webmin.com/ webmin/. webmin is a web-based interface for system administration for Solaris, including sendmail. Using any browser that supports tables and forms, you can use the sendmail configuration module, which allows administrators to manage sendmail aliases, masquerading, address rewriting, and other features. webmin can also use SSL to secure connections between your Web browser and the webmin server, which is especially useful for remote administration. Figure 27-3 shows the webmin interface and the options it supports for configuring sendmail.
FIGURE 27-3
webmin GUI for configuring sendmail
Part VI:
Services, Directories, and Applications
Running sendmail
sendmail is started as a daemon process from scripts that are usually activated during multiuser startup (/etc/rc2). To stop sendmail manually, use the following command:
/etc/init.d/sendmail stop
To start sendmail, use this command:
/etc/init.d/sendmail start
Troubleshooting
Since sendmail can be a difficult program to configure, sendmail also includes some provision for troubleshooting. For example, the command
server# sendmail bt
causes sendmail to execute in address-testing mode, which is very useful for testing rule sets interactively before including them in a production system. Keep in mind that ruleset 3 is no longer invoked automatically in address-testing mode: thus, to test the address
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