+/******************************************************************************/
+/* postlicyd: a postfix policy daemon with a lot of features */
+/* ~~~~~~~~~ */
+/* ________________________________________________________________________ */
+/* */
+/* Redistribution and use in source and binary forms, with or without */
+/* modification, are permitted provided that the following conditions */
+/* are met: */
+/* */
+/* 1. Redistributions of source code must retain the above copyright */
+/* notice, this list of conditions and the following disclaimer. */
+/* 2. Redistributions in binary form must reproduce the above copyright */
+/* notice, this list of conditions and the following disclaimer in the */
+/* documentation and/or other materials provided with the distribution. */
+/* 3. The names of its contributors may not be used to endorse or promote */
+/* products derived from this software without specific prior written */
+/* permission. */
+/* */
+/* THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND */
+/* ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE */
+/* IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR */
+/* PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS */
+/* BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR */
+/* CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF */
+/* SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS */
+/* INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN */
+/* CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) */
+/* ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF */
+/* THE POSSIBILITY OF SUCH DAMAGE. */
+/******************************************************************************/
+
+/*
+ * Copyright © 2007 Pierre Habouzit
+ */
+
+#include <sys/un.h>
+
+#include "postlicyd.h"
+#include "daemon.h"
+
+int tcp_listen(const struct sockaddr *addr, socklen_t len)
+{
+ int sock;
+
+ switch (addr->sa_family) {
+ case AF_UNIX:
+ unlink(((struct sockaddr_un *)addr)->sun_path);
+ sock = socket(PF_UNIX, SOCK_STREAM, 0);
+ break;
+ case AF_INET:
+ sock = socket(PF_INET, SOCK_STREAM, 0);
+ break;
+ case AF_INET6:
+ sock = socket(PF_INET6, SOCK_STREAM, 0);
+ break;
+ default:
+ errno = EINVAL;
+ return -1;
+ }
+
+ if (sock < 0) {
+ UNIXERR("socket");
+ return -1;
+ }
+
+ if (addr->sa_family != AF_UNIX) {
+ int v = 1;
+ if (setsockopt(sock, SOL_SOCKET, SO_REUSEADDR, &v, sizeof(v)) < 0) {
+ UNIXERR("setsockopt(SO_REUSEADDR)");
+ close(sock);
+ return -1;
+ }
+ }
+
+ if (bind(sock, addr, len) < 0) {
+ UNIXERR("bind");
+ close(sock);
+ return -1;
+ }
+
+ if (listen(sock, 0) < 0) {
+ UNIXERR("bind");
+ close(sock);
+ return -1;
+ }
+
+ return sock;
+}
+