1 files changed, 107 insertions, 0 deletions

diff --git a/src/lib/libc/net/rresvport.c b/src/lib/libc/net/rresvport.c
new file mode 100644
index 0000000000..ccc411500b
--- /dev/null
+++ b/src/lib/libc/net/rresvport.c
@@ -0,0 +1,107 @@
+/* $OpenBSD: rresvport.c,v 1.9 2005/11/10 10:00:17 espie Exp $ */
+/*
+ * Copyright (c) 1995, 1996, 1998 Theo de Raadt.  All rights reserved.
+ * Copyright (c) 1983, 1993, 1994
+ *      The Regents of the University of California.  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 University 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 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.
+ */
+
+#include <sys/param.h>
+#include <sys/socket.h>
+#include <sys/stat.h>
+
+#include <netinet/in.h>
+#include <arpa/inet.h>
+
+#include <signal.h>
+#include <fcntl.h>
+#include <netdb.h>
+#include <unistd.h>
+#include <pwd.h>
+#include <errno.h>
+#include <stdio.h>
+#include <ctype.h>
+#include <string.h>
+#include <syslog.h>
+#include <stdlib.h>
+#include <netgroup.h>
+
+int
+rresvport(int *alport)
+{
+        return rresvport_af(alport, AF_INET);
+}
+
+
+int
+rresvport_af(int *alport, int af)
+{
+        struct sockaddr_storage ss;
+        struct sockaddr *sa;
+        u_int16_t *portp;
+        int s;
+
+        bzero(&ss, sizeof ss);
+        sa = (struct sockaddr *)&ss;
+
+        switch (af) {
+        case AF_INET:
+                sa->sa_len = sizeof(struct sockaddr_in);
+                portp = &((struct sockaddr_in *)sa)->sin_port;
+                break;
+        case AF_INET6:
+                sa->sa_len = sizeof(struct sockaddr_in6);
+                portp = &((struct sockaddr_in6 *)sa)->sin6_port;
+                break;
+        default:
+                errno = EPFNOSUPPORT;
+                return (-1);
+        }
+        sa->sa_family = af;
+        
+        s = socket(af, SOCK_STREAM, 0);
+        if (s < 0)
+                return (-1);
+
+        *portp = htons(*alport);
+        if (*alport < IPPORT_RESERVED - 1) {
+                if (bind(s, sa, sa->sa_len) >= 0)
+                        return (s);
+                if (errno != EADDRINUSE) {
+                        (void)close(s);
+                        return (-1);
+                }
+        }
+
+        *portp = 0;
+        sa->sa_family = af;
+        if (bindresvport_sa(s, sa) == -1) {
+                (void)close(s);
+                return (-1);
+        }
+        *alport = ntohs(*portp);
+        return (s);
+}