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+/*++
+/* NAME
+/* pipe 8
+/* SUMMARY
+/* Postfix delivery to external command
+/* SYNOPSIS
+/* \fBpipe\fR [generic Postfix daemon options] command_attributes...
+/* DESCRIPTION
+/* The \fBpipe\fR(8) daemon processes requests from the Postfix queue
+/* manager to deliver messages to external commands.
+/* This program expects to be run from the \fBmaster\fR(8) process
+/* manager.
+/*
+/* Message attributes such as sender address, recipient address and
+/* next-hop host name can be specified as command-line macros that are
+/* expanded before the external command is executed.
+/*
+/* The \fBpipe\fR(8) daemon updates queue files and marks recipients
+/* as finished, or it informs the queue manager that delivery should
+/* be tried again at a later time. Delivery status reports are sent
+/* to the \fBbounce\fR(8), \fBdefer\fR(8) or \fBtrace\fR(8) daemon as
+/* appropriate.
+/* SINGLE-RECIPIENT DELIVERY
+/* .ad
+/* .fi
+/* Some destinations cannot handle more than one recipient per
+/* delivery request. Examples are pagers or fax machines.
+/* In addition, multi-recipient delivery is undesirable when
+/* prepending a \fBDelivered-to:\fR or \fBX-Original-To:\fR
+/* message header.
+/*
+/* To prevent Postfix from sending multiple recipients per delivery
+/* request, specify
+/* .sp
+/* .nf
+/* \fItransport\fB_destination_recipient_limit = 1\fR
+/* .fi
+/*
+/* in the Postfix \fBmain.cf\fR file, where \fItransport\fR
+/* is the name in the first column of the Postfix \fBmaster.cf\fR
+/* entry for the pipe-based delivery transport.
+/* COMMAND ATTRIBUTE SYNTAX
+/* .ad
+/* .fi
+/* The external command attributes are given in the \fBmaster.cf\fR
+/* file at the end of a service definition. The syntax is as follows:
+/* .IP "\fBchroot=\fIpathname\fR (optional)"
+/* Change the process root directory and working directory to
+/* the named directory. This happens before switching to the
+/* privileges specified with the \fBuser\fR attribute, and
+/* before executing the optional \fBdirectory=\fIpathname\fR
+/* directive. Delivery is deferred in case of failure.
+/* .sp
+/* This feature is available as of Postfix 2.3.
+/* .IP "\fBdirectory=\fIpathname\fR (optional)"
+/* Change to the named directory before executing the external command.
+/* The directory must be accessible for the user specified with the
+/* \fBuser\fR attribute (see below).
+/* The default working directory is \fB$queue_directory\fR.
+/* Delivery is deferred in case of failure.
+/* .sp
+/* This feature is available as of Postfix 2.2.
+/* .IP "\fBeol=\fIstring\fR (optional, default: \fB\en\fR)"
+/* The output record delimiter. Typically one would use either
+/* \fB\er\en\fR or \fB\en\fR. The usual C-style backslash escape
+/* sequences are recognized: \fB\ea \eb \ef \en \er \et \ev
+/* \e\fIddd\fR (up to three octal digits) and \fB\e\e\fR.
+/* .IP "\fBflags=BDFORXhqu.>\fR (optional)"
+/* Optional message processing flags. By default, a message is
+/* copied unchanged.
+/* .RS
+/* .IP \fBB\fR
+/* Append a blank line at the end of each message. This is required
+/* by some mail user agents that recognize "\fBFrom \fR" lines only
+/* when preceded by a blank line.
+/* .IP \fBD\fR
+/* Prepend a "\fBDelivered-To: \fIrecipient\fR" message header with the
+/* envelope recipient address. Note: for this to work, the
+/* \fItransport\fB_destination_recipient_limit\fR must be 1
+/* (see SINGLE-RECIPIENT DELIVERY above for details).
+/* .sp
+/* The \fBD\fR flag also enforces loop detection (Postfix 2.5 and later):
+/* if a message already contains a \fBDelivered-To:\fR header
+/* with the same recipient address, then the message is
+/* returned as undeliverable. The address comparison is case
+/* insensitive.
+/* .sp
+/* This feature is available as of Postfix 2.0.
+/* .IP \fBF\fR
+/* Prepend a "\fBFrom \fIsender time_stamp\fR" envelope header to
+/* the message content.
+/* This is expected by, for example, \fBUUCP\fR software.
+/* .IP \fBO\fR
+/* Prepend an "\fBX-Original-To: \fIrecipient\fR" message header
+/* with the recipient address as given to Postfix. Note: for this to
+/* work, the \fItransport\fB_destination_recipient_limit\fR must be 1
+/* (see SINGLE-RECIPIENT DELIVERY above for details).
+/* .sp
+/* This feature is available as of Postfix 2.0.
+/* .IP \fBR\fR
+/* Prepend a \fBReturn-Path:\fR message header with the envelope sender
+/* address.
+/* .IP \fBX\fR
+/* Indicate that the external command performs final delivery.
+/* This flag affects the status reported in "success" DSN
+/* (delivery status notification) messages, and changes it
+/* from "relayed" into "delivered".
+/* .sp
+/* This feature is available as of Postfix 2.5.
+/* .IP \fBh\fR
+/* Fold the command-line \fB$original_recipient\fR and
+/* \fB$recipient\fR address domain part
+/* (text to the right of the right-most \fB@\fR character) to
+/* lower case; fold the entire command-line \fB$domain\fR and
+/* \fB$nexthop\fR host or domain information to lower case.
+/* This is recommended for delivery via \fBUUCP\fR.
+/* .IP \fBq\fR
+/* Quote white space and other special characters in the command-line
+/* \fB$sender\fR, \fB$original_recipient\fR and \fB$recipient\fR
+/* address localparts (text to the
+/* left of the right-most \fB@\fR character), according to an 8-bit
+/* transparent version of RFC 822.
+/* This is recommended for delivery via \fBUUCP\fR or \fBBSMTP\fR.
+/* .sp
+/* The result is compatible with the address parsing of command-line
+/* recipients by the Postfix \fBsendmail\fR(1) mail submission command.
+/* .sp
+/* The \fBq\fR flag affects only entire addresses, not the partial
+/* address information from the \fB$user\fR, \fB$extension\fR or
+/* \fB$mailbox\fR command-line macros.
+/* .IP \fBu\fR
+/* Fold the command-line \fB$original_recipient\fR and
+/* \fB$recipient\fR address localpart (text to
+/* the left of the right-most \fB@\fR character) to lower case.
+/* This is recommended for delivery via \fBUUCP\fR.
+/* .IP \fB.\fR
+/* Prepend "\fB.\fR" to lines starting with "\fB.\fR". This is needed
+/* by, for example, \fBBSMTP\fR software.
+/* .IP \fB>\fR
+/* Prepend "\fB>\fR" to lines starting with "\fBFrom \fR". This is expected
+/* by, for example, \fBUUCP\fR software.
+/* .RE
+/* .IP "\fBnull_sender\fR=\fIreplacement\fR (default: MAILER-DAEMON)"
+/* Replace the null sender address (typically used for delivery
+/* status notifications) with the specified text
+/* when expanding the \fB$sender\fR command-line macro, and
+/* when generating a From_ or Return-Path: message header.
+/*
+/* If the null sender replacement text is a non-empty string
+/* then it is affected by the \fBq\fR flag for address quoting
+/* in command-line arguments.
+/*
+/* The null sender replacement text may be empty; this form
+/* is recommended for content filters that feed mail back into
+/* Postfix. The empty sender address is not affected by the
+/* \fBq\fR flag for address quoting in command-line arguments.
+/* .sp
+/* Caution: a null sender address is easily mis-parsed by
+/* naive software. For example, when the \fBpipe\fR(8) daemon
+/* executes a command such as:
+/* .sp
+/* .nf
+/* \fIWrong\fR: command -f$sender -- $recipient
+/* .fi
+/* .IP
+/* the command will mis-parse the -f option value when the
+/* sender address is a null string. For correct parsing,
+/* specify \fB$sender\fR as an argument by itself:
+/* .sp
+/* .nf
+/* \fIRight\fR: command -f $sender -- $recipient
+/* .fi
+/* .IP
+/* This feature is available as of Postfix 2.3.
+/* .IP "\fBsize\fR=\fIsize_limit\fR (optional)"
+/* Don't deliver messages that exceed this size limit (in
+/* bytes); return them to the sender instead.
+/* .IP "\fBuser\fR=\fIusername\fR (required)"
+/* .IP "\fBuser\fR=\fIusername\fR:\fIgroupname\fR"
+/* Execute the external command with the user ID and group ID of the
+/* specified \fIusername\fR. The software refuses to execute
+/* commands with root privileges, or with the privileges of the
+/* mail system owner. If \fIgroupname\fR is specified, the
+/* corresponding group ID is used instead of the group ID of
+/* \fIusername\fR.
+/* .IP "\fBargv\fR=\fIcommand\fR... (required)"
+/* The command to be executed. This must be specified as the
+/* last command attribute.
+/* The command is executed directly, i.e. without interpretation of
+/* shell meta characters by a shell command interpreter.
+/* .sp
+/* Specify "{" and "}" around command arguments that contain
+/* whitespace (Postfix 3.0 and later). Whitespace
+/* after the opening "{" and before the closing "}" is ignored.
+/* .sp
+/* In the command argument vector, the following macros are recognized
+/* and replaced with corresponding information from the Postfix queue
+/* manager delivery request.
+/* .sp
+/* In addition to the form ${\fIname\fR}, the forms $\fIname\fR and
+/* the deprecated form $(\fIname\fR) are also recognized.
+/* Specify \fB$$\fR where a single \fB$\fR is wanted.
+/* .RS
+/* .IP \fB${client_address}\fR
+/* This macro expands to the remote client network address.
+/* .sp
+/* This feature is available as of Postfix 2.2.
+/* .IP \fB${client_helo}\fR
+/* This macro expands to the remote client HELO command parameter.
+/* .sp
+/* This feature is available as of Postfix 2.2.
+/* .IP \fB${client_hostname}\fR
+/* This macro expands to the remote client hostname.
+/* .sp
+/* This feature is available as of Postfix 2.2.
+/* .IP \fB${client_port}\fR
+/* This macro expands to the remote client TCP port number.
+/* .sp
+/* This feature is available as of Postfix 2.5.
+/* .IP \fB${client_protocol}\fR
+/* This macro expands to the remote client protocol.
+/* .sp
+/* This feature is available as of Postfix 2.2.
+/* .IP \fB${domain}\fR
+/* This macro expands to the domain portion of the recipient
+/* address. For example, with an address \fIuser+foo@domain\fR
+/* the domain is \fIdomain\fR.
+/* .sp
+/* This information is modified by the \fBh\fR flag for case folding.
+/* .sp
+/* This feature is available as of Postfix 2.5.
+/* .IP \fB${extension}\fR
+/* This macro expands to the extension part of a recipient address.
+/* For example, with an address \fIuser+foo@domain\fR the extension is
+/* \fIfoo\fR.
+/* .sp
+/* A command-line argument that contains \fB${extension}\fR expands
+/* into as many command-line arguments as there are recipients.
+/* .sp
+/* This information is modified by the \fBu\fR flag for case folding.
+/* .IP \fB${mailbox}\fR
+/* This macro expands to the complete local part of a recipient address.
+/* For example, with an address \fIuser+foo@domain\fR the mailbox is
+/* \fIuser+foo\fR.
+/* .sp
+/* A command-line argument that contains \fB${mailbox}\fR
+/* expands to as many command-line arguments as there are recipients.
+/* .sp
+/* This information is modified by the \fBu\fR flag for case folding.
+/* .IP \fB${nexthop}\fR
+/* This macro expands to the next-hop hostname.
+/* .sp
+/* This information is modified by the \fBh\fR flag for case folding.
+/* .IP \fB${original_recipient}\fR
+/* This macro expands to the complete recipient address before any
+/* address rewriting or aliasing.
+/* .sp
+/* A command-line argument that contains
+/* \fB${original_recipient}\fR expands to as many
+/* command-line arguments as there are recipients.
+/* .sp
+/* This information is modified by the \fBhqu\fR flags for quoting
+/* and case folding.
+/* .sp
+/* This feature is available as of Postfix 2.5.
+/* .IP \fB${queue_id}\fR
+/* This macro expands to the queue id.
+/* .sp
+/* This feature is available as of Postfix 2.11.
+/* .IP \fB${recipient}\fR
+/* This macro expands to the complete recipient address.
+/* .sp
+/* A command-line argument that contains \fB${recipient}\fR
+/* expands to as many command-line arguments as there are recipients.
+/* .sp
+/* This information is modified by the \fBhqu\fR flags for quoting
+/* and case folding.
+/* .IP \fB${sasl_method}\fR
+/* This macro expands to the name of the SASL authentication
+/* mechanism in the AUTH command when the Postfix SMTP server
+/* received the message.
+/* .sp
+/* This feature is available as of Postfix 2.2.
+/* .IP \fB${sasl_sender}\fR
+/* This macro expands to the SASL sender name (i.e. the original
+/* submitter as per RFC 4954) in the MAIL FROM command when
+/* the Postfix SMTP server received the message.
+/* .sp
+/* This feature is available as of Postfix 2.2.
+/* .IP \fB${sasl_username}\fR
+/* This macro expands to the SASL user name in the AUTH command
+/* when the Postfix SMTP server received the message.
+/* .sp
+/* This feature is available as of Postfix 2.2.
+/* .IP \fB${sender}\fR
+/* This macro expands to the envelope sender address. By default,
+/* the null sender address expands to MAILER-DAEMON; this can
+/* be changed with the \fBnull_sender\fR attribute, as described
+/* above.
+/* .sp
+/* This information is modified by the \fBq\fR flag for quoting.
+/* .IP \fB${size}\fR
+/* This macro expands to Postfix's idea of the message size, which
+/* is an approximation of the size of the message as delivered.
+/* .IP \fB${user}\fR
+/* This macro expands to the username part of a recipient address.
+/* For example, with an address \fIuser+foo@domain\fR the username
+/* part is \fIuser\fR.
+/* .sp
+/* A command-line argument that contains \fB${user}\fR expands
+/* into as many command-line arguments as there are recipients.
+/* .sp
+/* This information is modified by the \fBu\fR flag for case folding.
+/* .RE
+/* STANDARDS
+/* RFC 3463 (Enhanced status codes)
+/* DIAGNOSTICS
+/* Command exit status codes are expected to
+/* follow the conventions defined in <\fBsysexits.h\fR>.
+/* Exit status 0 means normal successful completion.
+/*
+/* In the case of a non-zero exit status, a limited amount of
+/* command output is logged, and reported in a delivery status
+/* notification. When the output begins with a 4.X.X or 5.X.X
+/* enhanced status code, the status code takes precedence over
+/* the non-zero exit status (Postfix version 2.3 and later).
+/*
+/* After successful delivery (zero exit status) a limited
+/* amount of command output is logged, and reported in "success"
+/* delivery status notifications (Postfix 3.0 and later).
+/* This command output is not examined for the presence of an
+/* enhanced status code.
+/*
+/* Problems and transactions are logged to \fBsyslogd\fR(8)
+/* or \fBpostlogd\fR(8).
+/* Corrupted message files are marked so that the queue manager
+/* can move them to the \fBcorrupt\fR queue for further inspection.
+/* SECURITY
+/* .fi
+/* .ad
+/* This program needs a dual personality 1) to access the private
+/* Postfix queue and IPC mechanisms, and 2) to execute external
+/* commands as the specified user. It is therefore security sensitive.
+/* CONFIGURATION PARAMETERS
+/* .ad
+/* .fi
+/* Changes to \fBmain.cf\fR are picked up automatically as \fBpipe\fR(8)
+/* processes run for only a limited amount of time. Use the command
+/* "\fBpostfix reload\fR" to speed up a change.
+/*
+/* The text below provides only a parameter summary. See
+/* \fBpostconf\fR(5) for more details including examples.
+/* RESOURCE AND RATE CONTROLS
+/* .ad
+/* .fi
+/* In the text below, \fItransport\fR is the first field in a
+/* \fBmaster.cf\fR entry.
+/* .IP "\fBtransport_time_limit ($command_time_limit)\fR"
+/* A transport-specific override for the command_time_limit parameter
+/* value, where \fItransport\fR is the master.cf name of the message
+/* delivery transport.
+/* .PP
+/* Implemented in the qmgr(8) daemon:
+/* .IP "\fBtransport_destination_concurrency_limit ($default_destination_concurrency_limit)\fR"
+/* A transport-specific override for the
+/* default_destination_concurrency_limit parameter value, where
+/* \fItransport\fR is the master.cf name of the message delivery
+/* transport.
+/* .IP "\fBtransport_destination_recipient_limit ($default_destination_recipient_limit)\fR"
+/* A transport-specific override for the
+/* default_destination_recipient_limit parameter value, where
+/* \fItransport\fR is the master.cf name of the message delivery
+/* transport.
+/* MISCELLANEOUS CONTROLS
+/* .ad
+/* .fi
+/* .IP "\fBconfig_directory (see 'postconf -d' output)\fR"
+/* The default location of the Postfix main.cf and master.cf
+/* configuration files.
+/* .IP "\fBdaemon_timeout (18000s)\fR"
+/* How much time a Postfix daemon process may take to handle a
+/* request before it is terminated by a built-in watchdog timer.
+/* .IP "\fBdelay_logging_resolution_limit (2)\fR"
+/* The maximal number of digits after the decimal point when logging
+/* sub-second delay values.
+/* .IP "\fBexport_environment (see 'postconf -d' output)\fR"
+/* The list of environment variables that a Postfix process will export
+/* to non-Postfix processes.
+/* .IP "\fBipc_timeout (3600s)\fR"
+/* The time limit for sending or receiving information over an internal
+/* communication channel.
+/* .IP "\fBmail_owner (postfix)\fR"
+/* The UNIX system account that owns the Postfix queue and most Postfix
+/* daemon processes.
+/* .IP "\fBmax_idle (100s)\fR"
+/* The maximum amount of time that an idle Postfix daemon process waits
+/* for an incoming connection before terminating voluntarily.
+/* .IP "\fBmax_use (100)\fR"
+/* The maximal number of incoming connections that a Postfix daemon
+/* process will service before terminating voluntarily.
+/* .IP "\fBprocess_id (read-only)\fR"
+/* The process ID of a Postfix command or daemon process.
+/* .IP "\fBprocess_name (read-only)\fR"
+/* The process name of a Postfix command or daemon process.
+/* .IP "\fBqueue_directory (see 'postconf -d' output)\fR"
+/* The location of the Postfix top-level queue directory.
+/* .IP "\fBrecipient_delimiter (empty)\fR"
+/* The set of characters that can separate a user name from its
+/* extension (example: user+foo), or a .forward file name from its
+/* extension (example: .forward+foo).
+/* .IP "\fBsyslog_facility (mail)\fR"
+/* The syslog facility of Postfix logging.
+/* .IP "\fBsyslog_name (see 'postconf -d' output)\fR"
+/* A prefix that is prepended to the process name in syslog
+/* records, so that, for example, "smtpd" becomes "prefix/smtpd".
+/* .PP
+/* Available in Postfix version 3.0 and later:
+/* .IP "\fBpipe_delivery_status_filter ($default_delivery_status_filter)\fR"
+/* Optional filter for the \fBpipe\fR(8) delivery agent to change the
+/* delivery status code or explanatory text of successful or unsuccessful
+/* deliveries.
+/* .PP
+/* Available in Postfix version 3.3 and later:
+/* .IP "\fBenable_original_recipient (yes)\fR"
+/* Enable support for the original recipient address after an
+/* address is rewritten to a different address (for example with
+/* aliasing or with canonical mapping).
+/* .IP "\fBservice_name (read-only)\fR"
+/* The master.cf service name of a Postfix daemon process.
+/* SEE ALSO
+/* qmgr(8), queue manager
+/* bounce(8), delivery status reports
+/* postconf(5), configuration parameters
+/* master(5), generic daemon options
+/* master(8), process manager
+/* postlogd(8), Postfix logging
+/* syslogd(8), system logging
+/* LICENSE
+/* .ad
+/* .fi
+/* The Secure Mailer license must be distributed with this software.
+/* AUTHOR(S)
+/* Wietse Venema
+/* IBM T.J. Watson Research
+/* P.O. Box 704
+/* Yorktown Heights, NY 10598, USA
+/*
+/* Wietse Venema
+/* Google, Inc.
+/* 111 8th Avenue
+/* New York, NY 10011, USA
+/*--*/
+
+/* System library. */
+
+#include <sys_defs.h>
+#include <unistd.h>
+#include <stdlib.h>
+#include <string.h>
+#include <pwd.h>
+#include <grp.h>
+#include <fcntl.h>
+#include <ctype.h>
+
+#ifdef STRCASECMP_IN_STRINGS_H
+#include <strings.h>
+#endif
+
+/* Utility library. */
+
+#include <msg.h>
+#include <vstream.h>
+#include <vstring.h>
+#include <argv.h>
+#include <htable.h>
+#include <dict.h>
+#include <iostuff.h>
+#include <mymalloc.h>
+#include <mac_parse.h>
+#include <set_eugid.h>
+#include <split_at.h>
+#include <stringops.h>
+
+/* Global library. */
+
+#include <recipient_list.h>
+#include <deliver_request.h>
+#include <mail_params.h>
+#include <mail_version.h>
+#include <mail_conf.h>
+#include <bounce.h>
+#include <defer.h>
+#include <deliver_completed.h>
+#include <sent.h>
+#include <pipe_command.h>
+#include <mail_copy.h>
+#include <mail_addr.h>
+#include <canon_addr.h>
+#include <split_addr.h>
+#include <off_cvt.h>
+#include <quote_822_local.h>
+#include <flush_clnt.h>
+#include <dsn_util.h>
+#include <dsn_buf.h>
+#include <sys_exits.h>
+#include <delivered_hdr.h>
+#include <fold_addr.h>
+#include <mail_parm_split.h>
+
+/* Single server skeleton. */
+
+#include <mail_server.h>
+
+/* Application-specific. */
+
+ /*
+ * The mini symbol table name and keys used for expanding macros in
+ * command-line arguments.
+ *
+ * XXX Update the parse_callback() routine when something gets added here,
+ * even when the macro is not recipient dependent.
+ */
+#define PIPE_DICT_TABLE "pipe_command" /* table name */
+#define PIPE_DICT_NEXTHOP "nexthop" /* key */
+#define PIPE_DICT_RCPT "recipient" /* key */
+#define PIPE_DICT_ORIG_RCPT "original_recipient" /* key */
+#define PIPE_DICT_SENDER "sender"/* key */
+#define PIPE_DICT_USER "user" /* key */
+#define PIPE_DICT_EXTENSION "extension" /* key */
+#define PIPE_DICT_MAILBOX "mailbox" /* key */
+#define PIPE_DICT_DOMAIN "domain"/* key */
+#define PIPE_DICT_SIZE "size" /* key */
+#define PIPE_DICT_CLIENT_ADDR "client_address" /* key */
+#define PIPE_DICT_CLIENT_NAME "client_hostname" /* key */
+#define PIPE_DICT_CLIENT_PORT "client_port" /* key */
+#define PIPE_DICT_CLIENT_PROTO "client_protocol" /* key */
+#define PIPE_DICT_CLIENT_HELO "client_helo" /* key */
+#define PIPE_DICT_SASL_METHOD "sasl_method" /* key */
+#define PIPE_DICT_SASL_USERNAME "sasl_username" /* key */
+#define PIPE_DICT_SASL_SENDER "sasl_sender" /* key */
+#define PIPE_DICT_QUEUE_ID "queue_id" /* key */
+
+ /*
+ * Flags used to pass back the type of special parameter found by
+ * parse_callback.
+ */
+#define PIPE_FLAG_RCPT (1<<0)
+#define PIPE_FLAG_USER (1<<1)
+#define PIPE_FLAG_EXTENSION (1<<2)
+#define PIPE_FLAG_MAILBOX (1<<3)
+#define PIPE_FLAG_DOMAIN (1<<4)
+#define PIPE_FLAG_ORIG_RCPT (1<<5)
+
+ /*
+ * Additional flags. These are colocated with mail_copy() flags. Allow some
+ * space for extension of the mail_copy() interface.
+ */
+#define PIPE_OPT_FOLD_BASE (16)
+#define PIPE_OPT_FOLD_USER (FOLD_ADDR_USER << PIPE_OPT_FOLD_BASE)
+#define PIPE_OPT_FOLD_HOST (FOLD_ADDR_HOST << PIPE_OPT_FOLD_BASE)
+#define PIPE_OPT_QUOTE_LOCAL (1 << (PIPE_OPT_FOLD_BASE + 2))
+#define PIPE_OPT_FINAL_DELIVERY (1 << (PIPE_OPT_FOLD_BASE + 3))
+
+#define PIPE_OPT_FOLD_ALL (FOLD_ADDR_ALL << PIPE_OPT_FOLD_BASE)
+#define PIPE_OPT_FOLD_FLAGS(f) \
+ (((f) & PIPE_OPT_FOLD_ALL) >> PIPE_OPT_FOLD_BASE)
+
+ /*
+ * Tunable parameters. Values are taken from the config file, after
+ * prepending the service name to _name, and so on.
+ */
+int var_command_maxtime; /* You can now leave this here. */
+
+ /*
+ * Other main.cf parameters.
+ */
+char *var_pipe_dsn_filter;
+
+ /*
+ * For convenience. Instead of passing around lists of parameters, bundle
+ * them up in convenient structures.
+ */
+
+ /*
+ * Structure for service-specific configuration parameters.
+ */
+typedef struct {
+ int time_limit; /* per-service time limit */
+} PIPE_PARAMS;
+
+ /*
+ * Structure for command-line parameters.
+ */
+typedef struct {
+ char **command; /* argument vector */
+ uid_t uid; /* command privileges */
+ gid_t gid; /* command privileges */
+ int flags; /* mail_copy() flags */
+ char *exec_dir; /* working directory */
+ char *chroot_dir; /* chroot directory */
+ VSTRING *eol; /* output record delimiter */
+ VSTRING *null_sender; /* null sender expansion */
+ off_t size_limit; /* max size in bytes we will accept */
+} PIPE_ATTR;
+
+ /*
+ * Structure for command-line parameter macro expansion.
+ */
+typedef struct {
+ const char *service; /* for warnings */
+ int expand_flag; /* callback result */
+} PIPE_STATE;
+
+ /*
+ * Silly little macros.
+ */
+#define STR vstring_str
+
+/* parse_callback - callback for mac_parse() */
+
+static int parse_callback(int type, VSTRING *buf, void *context)
+{
+ PIPE_STATE *state = (PIPE_STATE *) context;
+ struct cmd_flags {
+ const char *name;
+ int flags;
+ };
+ static struct cmd_flags cmd_flags[] = {
+ PIPE_DICT_NEXTHOP, 0,
+ PIPE_DICT_RCPT, PIPE_FLAG_RCPT,
+ PIPE_DICT_ORIG_RCPT, PIPE_FLAG_ORIG_RCPT,
+ PIPE_DICT_SENDER, 0,
+ PIPE_DICT_USER, PIPE_FLAG_USER,
+ PIPE_DICT_EXTENSION, PIPE_FLAG_EXTENSION,
+ PIPE_DICT_MAILBOX, PIPE_FLAG_MAILBOX,
+ PIPE_DICT_DOMAIN, PIPE_FLAG_DOMAIN,
+ PIPE_DICT_SIZE, 0,
+ PIPE_DICT_CLIENT_ADDR, 0,
+ PIPE_DICT_CLIENT_NAME, 0,
+ PIPE_DICT_CLIENT_PORT, 0,
+ PIPE_DICT_CLIENT_PROTO, 0,
+ PIPE_DICT_CLIENT_HELO, 0,
+ PIPE_DICT_SASL_METHOD, 0,
+ PIPE_DICT_SASL_USERNAME, 0,
+ PIPE_DICT_SASL_SENDER, 0,
+ PIPE_DICT_QUEUE_ID, 0,
+ 0, 0,
+ };
+ struct cmd_flags *p;
+
+ /*
+ * See if this command-line argument references a special macro.
+ */
+ if (type == MAC_PARSE_VARNAME) {
+ for (p = cmd_flags; /* see below */ ; p++) {
+ if (p->name == 0) {
+ msg_warn("file %s/%s: service %s: unknown macro name: \"%s\"",
+ var_config_dir, MASTER_CONF_FILE,
+ state->service, vstring_str(buf));
+ return (MAC_PARSE_ERROR);
+ } else if (strcmp(vstring_str(buf), p->name) == 0) {
+ state->expand_flag |= p->flags;
+ return (0);
+ }
+ }
+ }
+ return (0);
+}
+
+/* morph_recipient - morph a recipient address */
+
+static void morph_recipient(VSTRING *buf, const char *address, int flags)
+{
+ VSTRING *temp = vstring_alloc(100);
+
+ /*
+ * Quote the recipient address as appropriate.
+ */
+ if (flags & PIPE_OPT_QUOTE_LOCAL)
+ quote_822_local(temp, address);
+ else
+ vstring_strcpy(temp, address);
+
+ /*
+ * Fold the recipient address as appropriate.
+ */
+ fold_addr(buf, STR(temp), PIPE_OPT_FOLD_FLAGS(flags));
+
+ vstring_free(temp);
+}
+
+/* expand_argv - expand macros in the argument vector */
+
+static ARGV *expand_argv(const char *service, char **argv,
+ RECIPIENT_LIST *rcpt_list, int flags)
+{
+ VSTRING *buf = vstring_alloc(100);
+ ARGV *result;
+ char **cpp;
+ PIPE_STATE state;
+ int i;
+ char *ext;
+ char *dom;
+
+ /*
+ * This appears to be simple operation (replace $name by its expansion).
+ * However, it becomes complex because a command-line argument that
+ * references $recipient must expand to as many command-line arguments as
+ * there are recipients (that's wat programs called by sendmail expect).
+ * So we parse each command-line argument, and depending on what we find,
+ * we either expand the argument just once, or we expand it once for each
+ * recipient. In either case we end up parsing the command-line argument
+ * twice. The amount of CPU time wasted will be negligible.
+ *
+ * Note: we can't use recursive macro expansion here, because recursion
+ * would screw up mail addresses that contain $ characters.
+ */
+#define NO 0
+#define EARLY_RETURN(x) { argv_free(result); vstring_free(buf); return (x); }
+
+ result = argv_alloc(1);
+ for (cpp = argv; *cpp; cpp++) {
+ state.service = service;
+ state.expand_flag = 0;
+ if (mac_parse(*cpp, parse_callback, (void *) &state) & MAC_PARSE_ERROR)
+ EARLY_RETURN(0);
+ if (state.expand_flag == 0) { /* no $recipient etc. */
+ argv_add(result, dict_eval(PIPE_DICT_TABLE, *cpp, NO), ARGV_END);
+ } else { /* contains $recipient etc. */
+ for (i = 0; i < rcpt_list->len; i++) {
+
+ /*
+ * This argument contains $recipient.
+ */
+ if (state.expand_flag & PIPE_FLAG_RCPT) {
+ morph_recipient(buf, rcpt_list->info[i].address, flags);
+ dict_update(PIPE_DICT_TABLE, PIPE_DICT_RCPT, STR(buf));
+ }
+
+ /*
+ * This argument contains $original_recipient.
+ */
+ if (state.expand_flag & PIPE_FLAG_ORIG_RCPT) {
+ morph_recipient(buf, rcpt_list->info[i].orig_addr, flags);
+ dict_update(PIPE_DICT_TABLE, PIPE_DICT_ORIG_RCPT, STR(buf));
+ }
+
+ /*
+ * This argument contains $user. Extract the plain user name.
+ * Either anything to the left of the extension delimiter or,
+ * in absence of the latter, anything to the left of the
+ * rightmost @.
+ *
+ * Beware: if the user name is blank (e.g. +user@host), the
+ * argument is suppressed. This is necessary to allow for
+ * cyrus bulletin-board (global mailbox) delivery. XXX But,
+ * skipping empty user parts will also prevent other
+ * expansions of this specific command-line argument.
+ */
+ if (state.expand_flag & PIPE_FLAG_USER) {
+ morph_recipient(buf, rcpt_list->info[i].address,
+ flags & PIPE_OPT_FOLD_ALL);
+ if (split_at_right(STR(buf), '@') == 0)
+ msg_warn("no @ in recipient address: %s",
+ rcpt_list->info[i].address);
+ if (*var_rcpt_delim)
+ split_addr(STR(buf), var_rcpt_delim);
+ if (*STR(buf) == 0)
+ continue;
+ dict_update(PIPE_DICT_TABLE, PIPE_DICT_USER, STR(buf));
+ }
+
+ /*
+ * This argument contains $extension. Extract the recipient
+ * extension: anything between the leftmost extension
+ * delimiter and the rightmost @. The extension may be blank.
+ */
+ if (state.expand_flag & PIPE_FLAG_EXTENSION) {
+ morph_recipient(buf, rcpt_list->info[i].address,
+ flags & PIPE_OPT_FOLD_ALL);
+ if (split_at_right(STR(buf), '@') == 0)
+ msg_warn("no @ in recipient address: %s",
+ rcpt_list->info[i].address);
+ if (*var_rcpt_delim == 0
+ || (ext = split_addr(STR(buf), var_rcpt_delim)) == 0)
+ ext = ""; /* insert null arg */
+ dict_update(PIPE_DICT_TABLE, PIPE_DICT_EXTENSION, ext);
+ }
+
+ /*
+ * This argument contains $mailbox. Extract the mailbox name:
+ * anything to the left of the rightmost @.
+ */
+ if (state.expand_flag & PIPE_FLAG_MAILBOX) {
+ morph_recipient(buf, rcpt_list->info[i].address,
+ flags & PIPE_OPT_FOLD_ALL);
+ if (split_at_right(STR(buf), '@') == 0)
+ msg_warn("no @ in recipient address: %s",
+ rcpt_list->info[i].address);
+ dict_update(PIPE_DICT_TABLE, PIPE_DICT_MAILBOX, STR(buf));
+ }
+
+ /*
+ * This argument contains $domain. Extract the domain name:
+ * anything to the right of the rightmost @.
+ */
+ if (state.expand_flag & PIPE_FLAG_DOMAIN) {
+ morph_recipient(buf, rcpt_list->info[i].address,
+ flags & PIPE_OPT_FOLD_ALL);
+ dom = split_at_right(STR(buf), '@');
+ if (dom == 0) {
+ msg_warn("no @ in recipient address: %s",
+ rcpt_list->info[i].address);
+ dom = ""; /* insert null arg */
+ }
+ dict_update(PIPE_DICT_TABLE, PIPE_DICT_DOMAIN, dom);
+ }
+
+ /*
+ * Done.
+ */
+ argv_add(result, dict_eval(PIPE_DICT_TABLE, *cpp, NO), ARGV_END);
+ }
+ }
+ }
+ argv_terminate(result);
+ vstring_free(buf);
+ return (result);
+}
+
+/* get_service_params - get service-name dependent config information */
+
+static void get_service_params(PIPE_PARAMS *config, char *service)
+{
+ const char *myname = "get_service_params";
+
+ /*
+ * Figure out the command time limit for this transport.
+ */
+ config->time_limit =
+ get_mail_conf_time2(service, _MAXTIME, var_command_maxtime, 's', 1, 0);
+
+ /*
+ * Give the poor tester a clue of what is going on.
+ */
+ if (msg_verbose)
+ msg_info("%s: time_limit %d", myname, config->time_limit);
+}
+
+/* get_service_attr - get command-line attributes */
+
+static void get_service_attr(PIPE_ATTR *attr, char **argv)
+{
+ const char *myname = "get_service_attr";
+ struct passwd *pwd;
+ struct group *grp;
+ char *user; /* user name */
+ char *group; /* group name */
+ char *size; /* max message size */
+ char *cp;
+
+ /*
+ * Initialize.
+ */
+ user = 0;
+ group = 0;
+ attr->command = 0;
+ attr->flags = 0;
+ attr->exec_dir = 0;
+ attr->chroot_dir = 0;
+ attr->eol = vstring_strcpy(vstring_alloc(1), "\n");
+ attr->null_sender = vstring_strcpy(vstring_alloc(1), MAIL_ADDR_MAIL_DAEMON);
+ attr->size_limit = 0;
+
+ /*
+ * Iterate over the command-line attribute list.
+ */
+ for ( /* void */ ; *argv != 0; argv++) {
+
+ /*
+ * flags=stuff
+ */
+ if (strncasecmp("flags=", *argv, sizeof("flags=") - 1) == 0) {
+ for (cp = *argv + sizeof("flags=") - 1; *cp; cp++) {
+ switch (*cp) {
+ case 'B':
+ attr->flags |= MAIL_COPY_BLANK;
+ break;
+ case 'D':
+ attr->flags |= MAIL_COPY_DELIVERED;
+ break;
+ case 'F':
+ attr->flags |= MAIL_COPY_FROM;
+ break;
+ case 'O':
+ attr->flags |= MAIL_COPY_ORIG_RCPT;
+ break;
+ case 'R':
+ attr->flags |= MAIL_COPY_RETURN_PATH;
+ break;
+ case 'X':
+ attr->flags |= PIPE_OPT_FINAL_DELIVERY;
+ break;
+ case '.':
+ attr->flags |= MAIL_COPY_DOT;
+ break;
+ case '>':
+ attr->flags |= MAIL_COPY_QUOTE;
+ break;
+ case 'h':
+ attr->flags |= PIPE_OPT_FOLD_HOST;
+ break;
+ case 'q':
+ attr->flags |= PIPE_OPT_QUOTE_LOCAL;
+ break;
+ case 'u':
+ attr->flags |= PIPE_OPT_FOLD_USER;
+ break;
+ default:
+ msg_fatal("unknown flag: %c (ignored)", *cp);
+ break;
+ }
+ }
+ }
+
+ /*
+ * user=username[:groupname]
+ */
+ else if (strncasecmp("user=", *argv, sizeof("user=") - 1) == 0) {
+ user = *argv + sizeof("user=") - 1;
+ if ((group = split_at(user, ':')) != 0) /* XXX clobbers argv */
+ if (*group == 0)
+ group = 0;
+ if ((pwd = getpwnam(user)) == 0)
+ msg_fatal("%s: unknown username: %s", myname, user);
+ attr->uid = pwd->pw_uid;
+ if (group != 0) {
+ if ((grp = getgrnam(group)) == 0)
+ msg_fatal("%s: unknown group: %s", myname, group);
+ attr->gid = grp->gr_gid;
+ } else {
+ attr->gid = pwd->pw_gid;
+ }
+ }
+
+ /*
+ * directory=string
+ */
+ else if (strncasecmp("directory=", *argv, sizeof("directory=") - 1) == 0) {
+ attr->exec_dir = mystrdup(*argv + sizeof("directory=") - 1);
+ }
+
+ /*
+ * chroot=string
+ */
+ else if (strncasecmp("chroot=", *argv, sizeof("chroot=") - 1) == 0) {
+ attr->chroot_dir = mystrdup(*argv + sizeof("chroot=") - 1);
+ }
+
+ /*
+ * eol=string
+ */
+ else if (strncasecmp("eol=", *argv, sizeof("eol=") - 1) == 0) {
+ unescape(attr->eol, *argv + sizeof("eol=") - 1);
+ }
+
+ /*
+ * null_sender=string
+ */
+ else if (strncasecmp("null_sender=", *argv, sizeof("null_sender=") - 1) == 0) {
+ vstring_strcpy(attr->null_sender, *argv + sizeof("null_sender=") - 1);
+ }
+
+ /*
+ * size=max_message_size (in bytes)
+ */
+ else if (strncasecmp("size=", *argv, sizeof("size=") - 1) == 0) {
+ size = *argv + sizeof("size=") - 1;
+ if ((attr->size_limit = off_cvt_string(size)) < 0)
+ msg_fatal("%s: bad size= value: %s", myname, size);
+ }
+
+ /*
+ * argv=command...
+ */
+ else if (strncasecmp("argv=", *argv, sizeof("argv=") - 1) == 0) {
+ *argv += sizeof("argv=") - 1; /* XXX clobbers argv */
+ attr->command = argv;
+ break;
+ }
+
+ /*
+ * Bad.
+ */
+ else
+ msg_fatal("unknown attribute name: %s", *argv);
+ }
+
+ /*
+ * Sanity checks. Verify that every member has an acceptable value.
+ */
+ if (user == 0)
+ msg_fatal("missing user= command-line attribute");
+ if (attr->command == 0)
+ msg_fatal("missing argv= command-line attribute");
+ if (attr->uid == 0)
+ msg_fatal("user= command-line attribute specifies root privileges");
+ if (attr->uid == var_owner_uid)
+ msg_fatal("user= command-line attribute specifies mail system owner %s",
+ var_mail_owner);
+ if (attr->gid == 0)
+ msg_fatal("user= command-line attribute specifies privileged group id 0");
+ if (attr->gid == var_owner_gid)
+ msg_fatal("user= command-line attribute specifies mail system owner %s group id %ld",
+ var_mail_owner, (long) attr->gid);
+ if (attr->gid == var_sgid_gid)
+ msg_fatal("user= command-line attribute specifies mail system %s group id %ld",
+ var_sgid_group, (long) attr->gid);
+
+ /*
+ * Give the poor tester a clue of what is going on.
+ */
+ if (msg_verbose)
+ msg_info("%s: uid %ld, gid %ld, flags %d, size %ld",
+ myname, (long) attr->uid, (long) attr->gid,
+ attr->flags, (long) attr->size_limit);
+}
+
+/* eval_command_status - do something with command completion status */
+
+static int eval_command_status(int command_status, char *service,
+ DELIVER_REQUEST *request, PIPE_ATTR *attr,
+ DSN_BUF *why)
+{
+ RECIPIENT *rcpt;
+ int status;
+ int result = 0;
+ int n;
+ char *saved_text;
+
+ /*
+ * Depending on the result, bounce or defer the message, and mark the
+ * recipient as done where appropriate.
+ */
+ switch (command_status) {
+ case PIPE_STAT_OK:
+ /* Save the command output before dsb_update() clobbers it. */
+ vstring_truncate(why->reason, trimblanks(STR(why->reason),
+ VSTRING_LEN(why->reason)) - STR(why->reason));
+ if (VSTRING_LEN(why->reason) > 0) {
+ VSTRING_TERMINATE(why->reason);
+ saved_text =
+ vstring_export(vstring_sprintf(
+ vstring_alloc(VSTRING_LEN(why->reason)),
+ " (%.100s)", STR(why->reason)));
+ } else
+ saved_text = mystrdup(""); /* uses shared R/O storage */
+ dsb_update(why, "2.0.0", (attr->flags & PIPE_OPT_FINAL_DELIVERY) ?
+ "delivered" : "relayed", DSB_SKIP_RMTA, DSB_SKIP_REPLY,
+ "delivered via %s service%s", service, saved_text);
+ myfree(saved_text);
+ (void) DSN_FROM_DSN_BUF(why);
+ for (n = 0; n < request->rcpt_list.len; n++) {
+ rcpt = request->rcpt_list.info + n;
+ status = sent(DEL_REQ_TRACE_FLAGS(request->flags),
+ request->queue_id, &request->msg_stats, rcpt,
+ service, &why->dsn);
+ if (status == 0 && (request->flags & DEL_REQ_FLAG_SUCCESS))
+ deliver_completed(request->fp, rcpt->offset);
+ result |= status;
+ }
+ break;
+ case PIPE_STAT_BOUNCE:
+ case PIPE_STAT_DEFER:
+ (void) DSN_FROM_DSN_BUF(why);
+ for (n = 0; n < request->rcpt_list.len; n++) {
+ rcpt = request->rcpt_list.info + n;
+ /* XXX Maybe encapsulate this with ndr_append(). */
+ status = (STR(why->status)[0] != '4' ?
+ bounce_append : defer_append)
+ (DEL_REQ_TRACE_FLAGS(request->flags),
+ request->queue_id,
+ &request->msg_stats, rcpt,
+ service, &why->dsn);
+ if (status == 0)
+ deliver_completed(request->fp, rcpt->offset);
+ result |= status;
+ }
+ break;
+ case PIPE_STAT_CORRUPT:
+ /* XXX DSN should we send something? */
+ result |= DEL_STAT_DEFER;
+ break;
+ default:
+ msg_panic("eval_command_status: bad status %d", command_status);
+ /* NOTREACHED */
+ }
+
+ return (result);
+}
+
+/* deliver_message - deliver message with extreme prejudice */
+
+static int deliver_message(DELIVER_REQUEST *request, char *service, char **argv)
+{
+ const char *myname = "deliver_message";
+ static PIPE_PARAMS conf;
+ static PIPE_ATTR attr;
+ RECIPIENT_LIST *rcpt_list = &request->rcpt_list;
+ DSN_BUF *why = dsb_create();
+ VSTRING *buf;
+ ARGV *expanded_argv = 0;
+ int deliver_status;
+ int command_status;
+ ARGV *export_env;
+ const char *sender;
+
+#define DELIVER_MSG_CLEANUP() { \
+ dsb_free(why); \
+ if (expanded_argv) argv_free(expanded_argv); \
+ }
+
+ if (msg_verbose)
+ msg_info("%s: from <%s>", myname, request->sender);
+
+ /*
+ * Sanity checks. The get_service_params() and get_service_attr()
+ * routines also do some sanity checks. Look up service attributes and
+ * config information only once. This is safe since the information comes
+ * from a trusted source, not from the delivery request.
+ */
+ if (request->nexthop[0] == 0)
+ msg_fatal("empty nexthop hostname");
+ if (rcpt_list->len <= 0)
+ msg_fatal("recipient count: %d", rcpt_list->len);
+ if (attr.command == 0) {
+ get_service_params(&conf, service);
+ get_service_attr(&attr, argv);
+ }
+
+ /*
+ * The D flag cannot be specified for multi-recipient deliveries.
+ */
+ if ((attr.flags & MAIL_COPY_DELIVERED) && (rcpt_list->len > 1)) {
+ dsb_simple(why, "4.3.5", "mail system configuration error");
+ deliver_status = eval_command_status(PIPE_STAT_DEFER, service,
+ request, &attr, why);
+ msg_warn("pipe flag `D' requires %s_destination_recipient_limit = 1",
+ service);
+ DELIVER_MSG_CLEANUP();
+ return (deliver_status);
+ }
+
+ /*
+ * The O flag cannot be specified for multi-recipient deliveries.
+ */
+ if ((attr.flags & MAIL_COPY_ORIG_RCPT) && (rcpt_list->len > 1)) {
+ dsb_simple(why, "4.3.5", "mail system configuration error");
+ deliver_status = eval_command_status(PIPE_STAT_DEFER, service,
+ request, &attr, why);
+ msg_warn("pipe flag `O' requires %s_destination_recipient_limit = 1",
+ service);
+ DELIVER_MSG_CLEANUP();
+ return (deliver_status);
+ }
+
+ /*
+ * Check that this agent accepts messages this large.
+ */
+ if (attr.size_limit != 0 && request->data_size > attr.size_limit) {
+ if (msg_verbose)
+ msg_info("%s: too big: size_limit = %ld, request->data_size = %ld",
+ myname, (long) attr.size_limit, request->data_size);
+ dsb_simple(why, "5.2.3", "message too large");
+ deliver_status = eval_command_status(PIPE_STAT_BOUNCE, service,
+ request, &attr, why);
+ DELIVER_MSG_CLEANUP();
+ return (deliver_status);
+ }
+
+ /*
+ * Don't deliver a trace-only request.
+ */
+ if (DEL_REQ_TRACE_ONLY(request->flags)) {
+ RECIPIENT *rcpt;
+ int status;
+ int n;
+
+ deliver_status = 0;
+ dsb_simple(why, "2.0.0", "delivers to command: %s", attr.command[0]);
+ (void) DSN_FROM_DSN_BUF(why);
+ for (n = 0; n < request->rcpt_list.len; n++) {
+ rcpt = request->rcpt_list.info + n;
+ status = sent(DEL_REQ_TRACE_FLAGS(request->flags),
+ request->queue_id, &request->msg_stats,
+ rcpt, service, &why->dsn);
+ if (status == 0 && (request->flags & DEL_REQ_FLAG_SUCCESS))
+ deliver_completed(request->fp, rcpt->offset);
+ deliver_status |= status;
+ }
+ DELIVER_MSG_CLEANUP();
+ return (deliver_status);
+ }
+
+ /*
+ * Report mail delivery loops. By definition, this requires
+ * single-recipient delivery. Don't silently lose recipients.
+ */
+ if (attr.flags & MAIL_COPY_DELIVERED) {
+ DELIVERED_HDR_INFO *info;
+ RECIPIENT *rcpt;
+ int loop_found;
+
+ if (request->rcpt_list.len > 1)
+ msg_panic("%s: delivered-to enabled with multi-recipient request",
+ myname);
+ info = delivered_hdr_init(request->fp, request->data_offset,
+ FOLD_ADDR_ALL);
+ rcpt = request->rcpt_list.info;
+ loop_found = delivered_hdr_find(info, rcpt->address);
+ delivered_hdr_free(info);
+ if (loop_found) {
+ dsb_simple(why, "5.4.6", "mail forwarding loop for %s",
+ rcpt->address);
+ deliver_status = eval_command_status(PIPE_STAT_BOUNCE, service,
+ request, &attr, why);
+ DELIVER_MSG_CLEANUP();
+ return (deliver_status);
+ }
+ }
+
+ /*
+ * Deliver. Set the nexthop and sender variables, and expand the command
+ * argument vector. Recipients will be expanded on the fly. XXX Rewrite
+ * envelope and header addresses according to transport-specific
+ * rewriting rules.
+ */
+ if (vstream_fseek(request->fp, request->data_offset, SEEK_SET) < 0)
+ msg_fatal("seek queue file %s: %m", VSTREAM_PATH(request->fp));
+
+ /*
+ * A non-empty null sender replacement is subject to the 'q' flag.
+ */
+ buf = vstring_alloc(10);
+ sender = *request->sender ? request->sender : STR(attr.null_sender);
+ if (*sender && (attr.flags & PIPE_OPT_QUOTE_LOCAL)) {
+ quote_822_local(buf, sender);
+ dict_update(PIPE_DICT_TABLE, PIPE_DICT_SENDER, STR(buf));
+ } else
+ dict_update(PIPE_DICT_TABLE, PIPE_DICT_SENDER, sender);
+ if (attr.flags & PIPE_OPT_FOLD_HOST) {
+ casefold(buf, request->nexthop);
+ dict_update(PIPE_DICT_TABLE, PIPE_DICT_NEXTHOP, STR(buf));
+ } else
+ dict_update(PIPE_DICT_TABLE, PIPE_DICT_NEXTHOP, request->nexthop);
+ vstring_sprintf(buf, "%ld", (long) request->data_size);
+ dict_update(PIPE_DICT_TABLE, PIPE_DICT_SIZE, STR(buf));
+ dict_update(PIPE_DICT_TABLE, PIPE_DICT_CLIENT_ADDR,
+ request->client_addr);
+ dict_update(PIPE_DICT_TABLE, PIPE_DICT_CLIENT_HELO,
+ request->client_helo);
+ dict_update(PIPE_DICT_TABLE, PIPE_DICT_CLIENT_NAME,
+ request->client_name);
+ dict_update(PIPE_DICT_TABLE, PIPE_DICT_CLIENT_PORT,
+ request->client_port);
+ dict_update(PIPE_DICT_TABLE, PIPE_DICT_CLIENT_PROTO,
+ request->client_proto);
+ dict_update(PIPE_DICT_TABLE, PIPE_DICT_SASL_METHOD,
+ request->sasl_method);
+ dict_update(PIPE_DICT_TABLE, PIPE_DICT_SASL_USERNAME,
+ request->sasl_username);
+ dict_update(PIPE_DICT_TABLE, PIPE_DICT_SASL_SENDER,
+ request->sasl_sender);
+ dict_update(PIPE_DICT_TABLE, PIPE_DICT_QUEUE_ID,
+ request->queue_id);
+ vstring_free(buf);
+
+ if ((expanded_argv = expand_argv(service, attr.command,
+ rcpt_list, attr.flags)) == 0) {
+ dsb_simple(why, "4.3.5", "mail system configuration error");
+ deliver_status = eval_command_status(PIPE_STAT_DEFER, service,
+ request, &attr, why);
+ DELIVER_MSG_CLEANUP();
+ return (deliver_status);
+ }
+ export_env = mail_parm_split(VAR_EXPORT_ENVIRON, var_export_environ);
+
+ command_status = pipe_command(request->fp, why,
+ CA_PIPE_CMD_UID(attr.uid),
+ CA_PIPE_CMD_GID(attr.gid),
+ CA_PIPE_CMD_SENDER(sender),
+ CA_PIPE_CMD_COPY_FLAGS(attr.flags),
+ CA_PIPE_CMD_ARGV(expanded_argv->argv),
+ CA_PIPE_CMD_TIME_LIMIT(conf.time_limit),
+ CA_PIPE_CMD_EOL(STR(attr.eol)),
+ CA_PIPE_CMD_EXPORT(export_env->argv),
+ CA_PIPE_CMD_CWD(attr.exec_dir),
+ CA_PIPE_CMD_CHROOT(attr.chroot_dir),
+ CA_PIPE_CMD_ORIG_RCPT(rcpt_list->info[0].orig_addr),
+ CA_PIPE_CMD_DELIVERED(rcpt_list->info[0].address),
+ CA_PIPE_CMD_END);
+ argv_free(export_env);
+
+ deliver_status = eval_command_status(command_status, service, request,
+ &attr, why);
+
+ /*
+ * Clean up.
+ */
+ DELIVER_MSG_CLEANUP();
+
+ return (deliver_status);
+}
+
+/* pipe_service - perform service for client */
+
+static void pipe_service(VSTREAM *client_stream, char *service, char **argv)
+{
+ DELIVER_REQUEST *request;
+ int status;
+
+ /*
+ * This routine runs whenever a client connects to the UNIX-domain socket
+ * dedicated to delivery via external command. What we see below is a
+ * little protocol to (1) tell the queue manager that we are ready, (2)
+ * read a request from the queue manager, and (3) report the completion
+ * status of that request. All connection-management stuff is handled by
+ * the common code in single_server.c.
+ */
+ if ((request = deliver_request_read(client_stream)) != 0) {
+ status = deliver_message(request, service, argv);
+ deliver_request_done(client_stream, request, status);
+ }
+}
+
+/* pre_accept - see if tables have changed */
+
+static void pre_accept(char *unused_name, char **unused_argv)
+{
+ const char *table;
+
+ if ((table = dict_changed_name()) != 0) {
+ msg_info("table %s has changed -- restarting", table);
+ exit(0);
+ }
+}
+
+/* drop_privileges - drop privileges most of the time */
+
+static void drop_privileges(char *unused_name, char **unused_argv)
+{
+ set_eugid(var_owner_uid, var_owner_gid);
+}
+
+/* pre_init - initialize */
+
+static void pre_init(char *unused_name, char **unused_argv)
+{
+ flush_init();
+}
+
+MAIL_VERSION_STAMP_DECLARE;
+
+/* main - pass control to the single-threaded skeleton */
+
+int main(int argc, char **argv)
+{
+ static const CONFIG_TIME_TABLE time_table[] = {
+ VAR_COMMAND_MAXTIME, DEF_COMMAND_MAXTIME, &var_command_maxtime, 1, 0,
+ 0,
+ };
+ static const CONFIG_STR_TABLE str_table[] = {
+ VAR_PIPE_DSN_FILTER, DEF_PIPE_DSN_FILTER, &var_pipe_dsn_filter, 0, 0,
+ 0,
+ };
+
+ /*
+ * Fingerprint executables and core dumps.
+ */
+ MAIL_VERSION_STAMP_ALLOCATE;
+
+ single_server_main(argc, argv, pipe_service,
+ CA_MAIL_SERVER_TIME_TABLE(time_table),
+ CA_MAIL_SERVER_STR_TABLE(str_table),
+ CA_MAIL_SERVER_PRE_INIT(pre_init),
+ CA_MAIL_SERVER_POST_INIT(drop_privileges),
+ CA_MAIL_SERVER_PRE_ACCEPT(pre_accept),
+ CA_MAIL_SERVER_PRIVILEGED,
+ CA_MAIL_SERVER_BOUNCE_INIT(VAR_PIPE_DSN_FILTER,
+ &var_pipe_dsn_filter),
+ 0);
+}