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/*++
/* NAME
/* mail_connect 3
/* SUMMARY
/* intra-mail system connection management
/* SYNOPSIS
/* #include <mail_proto.h>
/*
/* VSTREAM *mail_connect(class, name, block_mode)
/* const char *class;
/* const char *name;
/* int block_mode;
/*
/* VSTREAM *mail_connect_wait(class, name)
/* const char *class;
/* const char *name;
/* DESCRIPTION
/* This module does low-level connection management for intra-mail
/* communication. All reads and writes are subject to a time limit
/* (controlled by the global variable \fIvar_ipc_timeout\fR). This
/* protects against deadlock conditions that should never happen.
/*
/* mail_connect() attempts to connect to the UNIX-domain socket of
/* the named subsystem. The result is a null pointer in case of failure.
/* By default this function provides no errno logging.
/*
/* mail_connect_wait() is like mail_connect(), but keeps trying until
/* the connection succeeds. However, mail_connect_wait() terminates
/* with a fatal error when the service is down. This is to ensure that
/* processes terminate when the mail system shuts down.
/*
/* Arguments:
/* .IP class
/* Name of a class of local transport channel endpoints,
/* either \fIpublic\fR (accessible by any local user) or
/* \fIprivate\fR (administrative access only).
/* .IP service
/* The name of a local transport endpoint within the named class.
/* .IP block_mode
/* NON_BLOCKING for a non-blocking connection, or BLOCKING.
/* SEE ALSO
/* timed_ipc(3), enforce IPC timeouts.
/* 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
/*--*/
/* System library. */
#include <sys_defs.h>
#include <fcntl.h>
#include <unistd.h>
#include <stdlib.h>
#include <stdarg.h>
#include <errno.h>
/* Utility library. */
#include <msg.h>
#include <vstream.h>
#include <connect.h>
#include <mymalloc.h>
#include <iostuff.h>
#include <stringops.h>
/* Global library. */
#include "timed_ipc.h"
#include "mail_proto.h"
/* mail_connect - connect to mail subsystem */
VSTREAM *mail_connect(const char *class, const char *name, int block_mode)
{
char *path;
VSTREAM *stream;
int fd;
char *sock_name;
path = mail_pathname(class, name);
if ((fd = LOCAL_CONNECT(path, block_mode, 0)) < 0) {
if (msg_verbose)
msg_info("connect to subsystem %s: %m", path);
stream = 0;
} else {
if (msg_verbose)
msg_info("connect to subsystem %s", path);
stream = vstream_fdopen(fd, O_RDWR);
timed_ipc_setup(stream);
sock_name = concatenate(path, " socket", (char *) 0);
vstream_control(stream,
CA_VSTREAM_CTL_PATH(sock_name),
CA_VSTREAM_CTL_END);
myfree(sock_name);
}
myfree(path);
return (stream);
}
/* mail_connect_wait - connect to mail service until it succeeds */
VSTREAM *mail_connect_wait(const char *class, const char *name)
{
VSTREAM *stream;
int count = 0;
/*
* XXX Solaris workaround for ECONNREFUSED on a busy socket.
*/
while ((stream = mail_connect(class, name, BLOCKING)) == 0) {
if (count++ >= 10) {
msg_fatal("connect #%d to subsystem %s/%s: %m",
count, class, name);
} else {
msg_warn("connect #%d to subsystem %s/%s: %m",
count, class, name);
}
sleep(10); /* XXX make configurable */
}
return (stream);
}
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