Adding upstream version 3.7.10.upstream/3.7.10upstream

Signed-off-by: Daniel Baumann <daniel.baumann@progress-linux.org>

1 files changed, 267 insertions, 0 deletions

diff --git a/src/postlogd/postlogd.c b/src/postlogd/postlogd.c
new file mode 100644
index 0000000..902cbe5
--- /dev/null
+++ b/src/postlogd/postlogd.c
@@ -0,0 +1,267 @@
+/*++
+/* 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 picked up automatically, as
+/*	\fBpostlogd\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.
+/* .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.
+/* 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);
+}