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Diffstat (limited to 'src/postkick/postkick.c')
| -rw-r--r-- | src/postkick/postkick.c | 221 |
1 files changed, 221 insertions, 0 deletions
diff --git a/src/postkick/postkick.c b/src/postkick/postkick.c new file mode 100644 index 0000000..6bf9245 --- /dev/null +++ b/src/postkick/postkick.c @@ -0,0 +1,221 @@ +/*++ +/* 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 parameters 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); + } +} |