1 files changed, 110 insertions, 0 deletions
diff --git a/inet/bindresvport.c b/inet/bindresvport.c
new file mode 100644
index 0000000000..da33c05101
--- /dev/null
+++ b/inet/bindresvport.c
@@ -0,0 +1,110 @@
+/*
+ * Copyright (c) 2010, Oracle America, Inc.
+ *
+ * Redistribution and use in source and binary forms, with or without
+ * modification, are permitted provided that the following conditions are
+ * met:
+ *
+ *     * Redistributions of source code must retain the above copyright
+ *       notice, this list of conditions and the following disclaimer.
+ *     * 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.
+ *     * Neither the name of the "Oracle America, Inc." 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 COPYRIGHT HOLDERS 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
+ *   COPYRIGHT HOLDER 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.
+ */
+
+#include <errno.h>
+#include <unistd.h>
+#include <string.h>
+#include <sys/types.h>
+#include <sys/socket.h>
+#include <netinet/in.h>
+#include <libc-lock.h>
+
+/*
+ * Locks the static variables in this file.
+ */
+__libc_lock_define_initialized (static, lock);
+
+/*
+ * Bind a socket to a privileged IP port
+ */
+int
+bindresvport (int sd, struct sockaddr_in *sin)
+{
+  static short port;
+  struct sockaddr_in myaddr;
+  int i;
+
+#define STARTPORT 600
+#define LOWPORT 512
+#define ENDPORT (IPPORT_RESERVED - 1)
+#define NPORTS	(ENDPORT - STARTPORT + 1)
+  static short startport = STARTPORT;
+
+  if (sin == (struct sockaddr_in *) 0)
+    {
+      sin = &myaddr;
+      memset (sin, 0, sizeof (*sin));
+      sin->sin_family = AF_INET;
+    }
+  else if (sin->sin_family != AF_INET)
+    {
+      __set_errno (EAFNOSUPPORT);
+      return -1;
+    }
+
+  if (port == 0)
+    {
+      port = (__getpid () % NPORTS) + STARTPORT;
+    }
+
+  /* Initialize to make gcc happy.  */
+  int res = -1;
+
+  int nports = ENDPORT - startport + 1;
+  int endport = ENDPORT;
+
+  __libc_lock_lock (lock);
+
+ again:
+  for (i = 0; i < nports; ++i)
+    {
+      sin->sin_port = htons (port++);
+      if (port > endport)
+	port = startport;
+      res = __bind (sd, sin, sizeof (struct sockaddr_in));
+      if (res >= 0 || errno != EADDRINUSE)
+	break;
+    }
+
+  if (i == nports && startport != LOWPORT)
+    {
+      startport = LOWPORT;
+      endport = STARTPORT - 1;
+      nports = STARTPORT - LOWPORT;
+      port = LOWPORT + port % (STARTPORT - LOWPORT);
+      goto again;
+    }
+
+  __libc_lock_unlock (lock);
+
+  return res;
+}
+libc_hidden_def (bindresvport)