summaryrefslogtreecommitdiffstats
path: root/src/global/mail_connect.c
diff options
context:
space:
mode:
Diffstat (limited to '')
-rw-r--r--src/global/mail_connect.c127
1 files changed, 127 insertions, 0 deletions
diff --git a/src/global/mail_connect.c b/src/global/mail_connect.c
new file mode 100644
index 0000000..4fdfe78
--- /dev/null
+++ b/src/global/mail_connect.c
@@ -0,0 +1,127 @@
+/*++
+/* 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);
+}