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/*++
/* NAME
/* postkick 1
/* SUMMARY
/* kick a Postfix service
/* SYNOPSIS
/* .fi
/* \fBpostkick\fR [\fB-c \fIconfig_dir\fR] [\fB-v\fR]
/* \fIclass service request\fR
/* DESCRIPTION
/* The \fBpostkick\fR(1) command sends \fIrequest\fR to the
/* specified \fIservice\fR over a local transport channel.
/* This command makes Postfix private IPC accessible
/* for use in, for example, shell scripts.
/*
/* Options:
/* .IP "\fB-c\fR \fIconfig_dir\fR"
/* Read the \fBmain.cf\fR configuration file in the named directory
/* instead of the default configuration directory.
/* .IP \fB-v\fR
/* Enable verbose logging for debugging purposes. Multiple \fB-v\fR
/* options make the software increasingly verbose.
/* .PP
/* Arguments:
/* .IP \fIclass\fR
/* Name of a class of local transport channel endpoints,
/* either \fBpublic\fR (accessible by any local user) or
/* \fBprivate\fR (administrative access only).
/* .IP \fIservice\fR
/* The name of a local transport endpoint within the named class.
/* .IP \fIrequest\fR
/* A string. The list of valid requests is service-specific.
/* DIAGNOSTICS
/* Problems and transactions are logged to the standard error
/* stream.
/* ENVIRONMENT
/* .ad
/* .fi
/* .IP \fBMAIL_CONFIG\fR
/* Directory with Postfix configuration files.
/* .IP \fBMAIL_VERBOSE\fR
/* Enable verbose logging for debugging purposes.
/* CONFIGURATION PARAMETERS
/* .ad
/* .fi
/* The following \fBmain.cf\fR parameters are especially relevant to
/* this program.
/* 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 "\fBapplication_event_drain_time (100s)\fR"
/* How long the \fBpostkick\fR(1) command waits for a request to enter the
/* Postfix daemon process input buffer before giving up.
/* .IP "\fBimport_environment (see 'postconf -d' output)\fR"
/* The list of environment variables that a privileged Postfix
/* process will import from a non-Postfix parent process, or name=value
/* environment overrides.
/* .IP "\fBqueue_directory (see 'postconf -d' output)\fR"
/* The location of the Postfix top-level queue directory.
/* FILES
/* /var/spool/postfix/private, private class endpoints
/* /var/spool/postfix/public, public class endpoints
/* SEE ALSO
/* qmgr(8), queue manager trigger protocol
/* pickup(8), local pickup daemon
/* postconf(5), configuration parameters
/* 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 <sys/stat.h>
#include <fcntl.h>
#include <unistd.h>
#include <string.h>
#include <stdlib.h>
/* Utility library. */
#include <msg.h>
#include <mymalloc.h>
#include <vstream.h>
#include <msg_vstream.h>
#include <safe.h>
#include <events.h>
#include <warn_stat.h>
#include <clean_env.h>
/* Global library. */
#include <mail_proto.h>
#include <mail_params.h>
#include <mail_version.h>
#include <mail_conf.h>
#include <mail_parm_split.h>
static NORETURN usage(char *myname)
{
msg_fatal("usage: %s [-c config_dir] [-v] class service request", myname);
}
MAIL_VERSION_STAMP_DECLARE;
int main(int argc, char **argv)
{
char *class;
char *service;
char *request;
int fd;
struct stat st;
char *slash;
int c;
ARGV *import_env;
/*
* Fingerprint executables and core dumps.
*/
MAIL_VERSION_STAMP_ALLOCATE;
/*
* To minimize confusion, make sure that the standard file descriptors
* are open before opening anything else. XXX Work around for 44BSD where
* fstat can return EBADF on an open file descriptor.
*/
for (fd = 0; fd < 3; fd++)
if (fstat(fd, &st) == -1
&& (close(fd), open("/dev/null", O_RDWR, 0)) != fd)
msg_fatal("open /dev/null: %m");
/*
* Process environment options as early as we can.
*/
if (safe_getenv(CONF_ENV_VERB))
msg_verbose = 1;
/*
* Initialize. Set up logging. Read the global configuration file after
* parsing command-line arguments.
*/
if ((slash = strrchr(argv[0], '/')) != 0 && slash[1])
argv[0] = slash + 1;
msg_vstream_init(argv[0], VSTREAM_ERR);
set_mail_conf_str(VAR_PROCNAME, var_procname = mystrdup(argv[0]));
/*
* Check the Postfix library version as soon as we enable logging.
*/
MAIL_VERSION_CHECK;
/*
* Parse JCL.
*/
while ((c = GETOPT(argc, argv, "c:v")) > 0) {
switch (c) {
default:
usage(argv[0]);
case 'c':
if (setenv(CONF_ENV_PATH, optarg, 1) < 0)
msg_fatal("out of memory");
break;
case 'v':
msg_verbose++;
break;
}
}
if (argc != optind + 3)
usage(argv[0]);
class = argv[optind];
service = argv[optind + 1];
request = argv[optind + 2];
/*
* Finish initializations.
*/
mail_conf_read();
/* Enforce consistent operation of different Postfix parts. */
import_env = mail_parm_split(VAR_IMPORT_ENVIRON, var_import_environ);
update_env(import_env->argv);
argv_free(import_env);
if (chdir(var_queue_dir))
msg_fatal("chdir %s: %m", var_queue_dir);
/*
* Kick the service.
*/
if (mail_trigger(class, service, request, strlen(request)) < 0) {
msg_warn("Cannot contact class %s service %s - perhaps the mail system is down",
class, service);
exit(1);
}
/*
* Problem: With triggers over full duplex (i.e. non-FIFO) channels, we
* must avoid closing the channel before the server has received the
* request. Otherwise some hostile kernel may throw away the request.
*
* Solution: The trigger routine registers a read event handler that runs
* when the server closes the channel. The event_drain() routine waits
* for the event handler to run, but gives up when it takes too long.
*/
else {
event_drain(var_event_drain);
exit(0);
}
}
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