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/*++
/* NAME
/* postlogd 8
/* SUMMARY
/* Postfix internal log server
/* SYNOPSIS
/* \fBpostlogd\fR [generic Postfix daemon options]
/* DESCRIPTION
/* This program logs events on behalf of Postfix programs
/* when the maillog configuration parameter specifies a non-empty
/* value.
/* BUGS
/* Non-daemon Postfix programs don't know that they should log
/* to the internal logging service before they have processed
/* command-line options and main.cf parameters. These programs
/* still log earlier events to the syslog service.
/*
/* If Postfix is down, the non-daemon programs \fBpostfix\fR(1),
/* \fBpostsuper\fR(1), \fBpostmulti\fR(1), and \fBpostlog\fR(1),
/* will log directly to \fB$maillog_file\fR. These programs
/* expect to run with root privileges, for example during
/* Postfix start-up, reload, or shutdown.
/*
/* Other non-daemon Postfix programs will never write directly to
/* \fB$maillog_file\fR (also, logging to stdout would interfere
/* with the operation of some of these programs). These programs
/* can log to \fBpostlogd\fR(8) if they are run by the super-user,
/* or if their executable file has set-gid permission. Do not
/* set this permission on programs other than \fBpostdrop\fR(1),
/* \fBpostqueue\fR(1) and (Postfix >= 3.7) \fBpostlog\fR(1).
/* CONFIGURATION PARAMETERS
/* .ad
/* .fi
/* Changes to \fBmain.cf\fR are not picked up automatically,
/* because \fBpostlogd\fR(8) terminates only after reaching
/* the \fBmax_idle\fR time limit.
/* 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.
/* .IP "\fBconfig_directory (see 'postconf -d' output)\fR"
/* The default location of the Postfix main.cf and master.cf
/* configuration files.
/* .IP "\fBmaillog_file (empty)\fR"
/* The name of an optional logfile that is written by the Postfix
/* \fBpostlogd\fR(8) service.
/* .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 "\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".
/* .IP "\fBservice_name (read-only)\fR"
/* The master.cf service name of a Postfix daemon process.
/* .IP "\fBpostlogd_watchdog_timeout (10s)\fR"
/* How much time a \fBpostlogd\fR(8) process may take to process a request
/* before it is terminated by a built-in watchdog timer.
/* .PP
/* Available in Postfix 3.9 and later:
/* .IP "\fBmaillog_file_permissions (0600)\fR"
/* The file access permissions that will be set when the file
/* $maillog_file is created for the first time, or when the file is
/* created after an existing file is rotated.
/* SEE ALSO
/* postconf(5), configuration parameters
/* syslogd(8), system logging
/* README_FILES
/* .ad
/* .fi
/* Use "\fBpostconf readme_directory\fR" or
/* "\fBpostconf html_directory\fR" to locate this information.
/* .na
/* .nf
/* MAILLOG_README, Postfix logging to file or stdout
/* LICENSE
/* .ad
/* .fi
/* The Secure Mailer license must be distributed with this software.
/* HISTORY
/* .ad
/* .fi
/* This service was introduced with Postfix version 3.4.
/* AUTHOR(S)
/* Wietse Venema
/* Google, Inc.
/* 111 8th Avenue
/* New York, NY 10011, USA
/*--*/
/*
* System library.
*/
#include <sys_defs.h>
/*
* Utility library.
*/
#include <logwriter.h>
#include <msg.h>
#include <msg_logger.h>
#include <stringops.h>
#include <vstream.h>
/*
* Global library.
*/
#include <mail_params.h>
#include <mail_task.h>
#include <mail_version.h>
#include <maillog_client.h>
/*
* Server skeleton.
*/
#include <mail_server.h>
/*
* Tunable parameters.
*/
int var_postlogd_watchdog;
/*
* Silly little macros.
*/
#define STR(x) vstring_str(x)
#define LEN(x) VSTRING_LEN(x)
/*
* Logfile stream.
*/
static VSTREAM *postlogd_stream = 0;
/* postlogd_fallback - log messages from postlogd(8) itself */
static void postlogd_fallback(const char *buf)
{
(void) logwriter_write(postlogd_stream, buf, strlen(buf));
}
/* postlogd_service - perform service for client */
static void postlogd_service(char *buf, ssize_t len, char *unused_service,
char **unused_argv)
{
if (postlogd_stream) {
(void) logwriter_write(postlogd_stream, buf, len);
}
/*
* After a configuration change that removes the maillog_file pathname,
* this service may still receive messages (after "postfix reload" or
* after process refresh) from programs that use the old maillog_file
* setting. Redirect those messages to the current logging mechanism.
*/
else {
char *bp = buf;
char *progname_pid;
/*
* Avoid surprises: strip off the date, time, host, and program[pid]:
* prefix that were prepended by msg_logger(3). Then, hope that the
* current logging driver suppresses its own PID, when it sees that
* there is a PID embedded in the 'program name'.
*/
(void) mystrtok(&bp, CHARS_SPACE); /* month */
(void) mystrtok(&bp, CHARS_SPACE); /* day */
(void) mystrtok(&bp, CHARS_SPACE); /* time */
(void) mystrtok(&bp, CHARS_SPACE); /* host */
progname_pid = mystrtok(&bp, ":" CHARS_SPACE); /* name[pid] sans ':' */
bp += strspn(bp, CHARS_SPACE);
if (progname_pid)
maillog_client_init(progname_pid, MAILLOG_CLIENT_FLAG_NONE);
msg_info("%.*s", (int) (len - (bp - buf)), bp);
/*
* Restore the program name, in case postlogd(8) needs to log
* something about itself. We have to call maillog_client_init() in
* any case, because neither msg_syslog_init() nor openlog() make a
* copy of the name argument. We can't leave that pointing into the
* middle of the above message buffer.
*/
maillog_client_init(mail_task((char *) 0), MAILLOG_CLIENT_FLAG_NONE);
}
}
/* pre_jail_init - pre-jail handling */
static void pre_jail_init(char *unused_service_name, char **argv)
{
/*
* During process initialization, the postlogd daemon will log events to
* the postlog socket, so that they can be logged to file later. Once the
* postlogd daemon is handling requests, it will stop logging to the
* postlog socket and will instead write to the logfile, to avoid
* infinite recursion.
*/
/*
* Sanity check. This service takes no command-line arguments.
*/
if (argv[0])
msg_fatal("unexpected command-line argument: %s", argv[0]);
/*
* After a configuration change that removes the maillog_file pathname,
* this service may still receive messages from processes that still use
* the old configuration. Those messages will have to be redirected to
* the current logging subsystem.
*/
if (*var_maillog_file != 0) {
/*
* Instantiate the logwriter or bust.
*/
postlogd_stream = logwriter_open_or_die(var_maillog_file);
/*
* Inform the msg_logger client to stop using the postlog socket, and
* to call our logwriter.
*/
msg_logger_control(CA_MSG_LOGGER_CTL_FALLBACK_ONLY,
CA_MSG_LOGGER_CTL_FALLBACK_FN(postlogd_fallback),
CA_MSG_LOGGER_CTL_END);
}
}
/* post_jail_init - post-jail initialization */
static void post_jail_init(char *unused_name, char **unused_argv)
{
/*
* Prevent automatic process suicide after a limited number of client
* requests. It is OK to terminate after a limited amount of idle time.
*/
var_use_limit = 0;
}
MAIL_VERSION_STAMP_DECLARE;
/* main - pass control to the multi-threaded skeleton */
int main(int argc, char **argv)
{
static const CONFIG_TIME_TABLE time_table[] = {
VAR_POSTLOGD_WATCHDOG, DEF_POSTLOGD_WATCHDOG, &var_postlogd_watchdog, 10, 0,
0,
};
/*
* Fingerprint executables and core dumps.
*/
MAIL_VERSION_STAMP_ALLOCATE;
/*
* This is a datagram service, not a stream service, so that postlogd can
* restart immediately after "postfix reload" without requiring clients
* to resend messages. Those messages remain queued in the kernel until a
* new postlogd process retrieves them. It would be unreasonable to
* require that clients retransmit logs, especially in the case of a
* fatal or panic error.
*/
dgram_server_main(argc, argv, postlogd_service,
CA_MAIL_SERVER_TIME_TABLE(time_table),
CA_MAIL_SERVER_PRE_INIT(pre_jail_init),
CA_MAIL_SERVER_POST_INIT(post_jail_init),
CA_MAIL_SERVER_SOLITARY,
CA_MAIL_SERVER_WATCHDOG(&var_postlogd_watchdog),
0);
}
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