1 files changed, 97 insertions, 0 deletions
diff --git a/third_party/address_sorting/address_sorting_posix.c b/third_party/address_sorting/address_sorting_posix.c
new file mode 100644
index 0000000000..d0dfe12469
--- /dev/null
+++ b/third_party/address_sorting/address_sorting_posix.c
@@ -0,0 +1,97 @@
+/*	$NetBSD: getaddrinfo.c,v 1.82 2006/03/25 12:09:40 rpaulo Exp $	*/
+/*	$KAME: getaddrinfo.c,v 1.29 2000/08/31 17:26:57 itojun Exp $	*/
+/*
+ * Copyright (C) 1995, 1996, 1997, and 1998 WIDE Project.
+ * All rights reserved.
+ *
+ * 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. Neither the name of the project nor the names of its contributors
+ *    may be used to endorse or promote products derived from this software
+ *    without specific prior written permission.
+ *
+ * THIS SOFTWARE IS PROVIDED BY THE PROJECT 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 PROJECT 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.
+ *
+ */
+
+/*
+ * This is an adaptation of Android's implementation of RFC 6724
+ * (in Android's getaddrinfo.c). It has some cosmetic differences
+ * from Android's getaddrinfo.c, but Android's getaddrinfo.c was
+ * used as a guide or example of a way to implement the RFC 6724 spec when
+ * this was written.
+ */
+
+#include "address_sorting_internal.h"
+
+#if defined(ADDRESS_SORTING_POSIX)
+
+#include <errno.h>
+#include <inttypes.h>
+#include <limits.h>
+#include <stdlib.h>
+#include <string.h>
+#include <sys/types.h>
+#include <unistd.h>
+
+static bool posix_source_addr_factory_get_source_addr(
+    address_sorting_source_addr_factory* factory,
+    const address_sorting_address* dest_addr,
+    address_sorting_address* source_addr) {
+  bool source_addr_exists = false;
+  // Android sets SOCK_CLOEXEC. Don't set this here for portability.
+  int s = socket(((struct sockaddr*)dest_addr)->sa_family, SOCK_DGRAM, 0);
+  if (s != -1) {
+    if (connect(s, (const struct sockaddr*)&dest_addr->addr,
+                (socklen_t)dest_addr->len) != -1) {
+      address_sorting_address found_source_addr;
+      memset(&found_source_addr, 0, sizeof(found_source_addr));
+      found_source_addr.len = sizeof(found_source_addr.addr);
+      if (getsockname(s, (struct sockaddr*)&found_source_addr.addr,
+                      (socklen_t*)&found_source_addr.len) != -1) {
+        source_addr_exists = true;
+        *source_addr = found_source_addr;
+      }
+    }
+  }
+  close(s);
+  return source_addr_exists;
+}
+
+static void posix_source_addr_factory_destroy(
+    address_sorting_source_addr_factory* self) {
+  free(self);
+}
+
+static const address_sorting_source_addr_factory_vtable
+    posix_source_addr_factory_vtable = {
+        posix_source_addr_factory_get_source_addr,
+        posix_source_addr_factory_destroy,
+};
+
+address_sorting_source_addr_factory*
+address_sorting_create_source_addr_factory_for_current_platform() {
+  address_sorting_source_addr_factory* factory =
+      malloc(sizeof(address_sorting_source_addr_factory));
+  memset(factory, 0, sizeof(address_sorting_source_addr_factory));
+  factory->vtable = &posix_source_addr_factory_vtable;
+  return factory;
+}
+
+#endif  // defined(ADDRESS_SORTING_POSIX)