1 files changed, 93 insertions, 0 deletions
diff --git a/src/util/unix_dgram_listen.c b/src/util/unix_dgram_listen.c
new file mode 100644
index 0000000..e73ad4e
--- /dev/null
+++ b/src/util/unix_dgram_listen.c
@@ -0,0 +1,93 @@
+/*++
+/* NAME
+/*	unix_dgram_listen 3
+/* SUMMARY
+/*	listen to UNIX-domain datagram server
+/* SYNOPSIS
+/*	#include <listen.h>
+/*
+/*	int	unix_dgram_listen(
+/*	const char *path,
+/*	int	block_mode)
+/* DESCRIPTION
+/*	unix_dgram_listen() binds to the specified UNIX-domain
+/*	datagram endpoint, and returns the resulting file descriptor.
+/*
+/*	Arguments:
+/* .IP path
+/*	Null-terminated string with connection destination.
+/* .IP backlog
+/*	Either NON_BLOCKING for a non-blocking socket, or BLOCKING for
+/*	blocking mode.
+/* DIAGNOSTICS
+/*	Fatal errors: path too large, can't create socket.
+/* LICENSE
+/* .ad
+/* .fi
+/*	The Secure Mailer license must be distributed with this software.
+/* AUTHOR(S)
+/*	Wietse Venema
+/*	Google, Inc.
+/*	111 8th Avenue
+/*	New York, NY 10011, USA
+/*--*/
+
+ /*
+  * System library.
+  */
+#include <sys_defs.h>
+#include <sys/socket.h>
+#include <sys/un.h>
+#include <sys/stat.h>
+#include <unistd.h>
+#include <string.h>
+#include <errno.h>
+
+ /*
+  * Utility library.
+  */
+#include <iostuff.h>
+#include <listen.h>
+#include <msg.h>
+
+/* unix_dgram_listen - bind to UNIX-domain datagram endpoint */
+
+int     unix_dgram_listen(const char *path, int block_mode)
+{
+    const char myname[] = "unix_dgram_listen";
+#undef sun
+    struct sockaddr_un sun;
+    ssize_t path_len;
+    int     sock;
+
+    /*
+     * Translate address information to internal form.
+     */
+    if ((path_len = strlen(path)) >= sizeof(sun.sun_path))
+	msg_fatal("%s: unix-domain name too long: %s", myname, path);
+    memset((void *) &sun, 0, sizeof(sun));
+    sun.sun_family = AF_UNIX;
+#ifdef HAS_SUN_LEN
+    sun.sun_len = path_len + 1;
+#endif
+    memcpy(sun.sun_path, path, path_len + 1);
+
+    /*
+     * Create a 'server' socket.
+     */
+    if ((sock = socket(AF_UNIX, SOCK_DGRAM, 0)) < 0)
+	msg_fatal("%s: socket: %m", myname);
+    if (unlink(path) < 0 && errno != ENOENT) 
+        msg_fatal( "remove %s: %m", path);
+    if (bind(sock, (struct sockaddr *) & sun, sizeof(sun)) < 0) 
+        msg_fatal( "bind: %s: %m", path);
+#ifdef FCHMOD_UNIX_SOCKETS
+    if (fchmod(sock, 0666) < 0)
+        msg_fatal("fchmod socket %s: %m", path);
+#else
+    if (chmod(path, 0666) < 0)
+        msg_fatal("chmod socket %s: %m", path);
+#endif
+    non_blocking(sock, block_mode);
+    return (sock);
+}