diff options
Diffstat (limited to 'openbsd-compat/bindresvport.c')
| -rw-r--r-- | openbsd-compat/bindresvport.c | 120 |
1 files changed, 120 insertions, 0 deletions
diff --git a/openbsd-compat/bindresvport.c b/openbsd-compat/bindresvport.c new file mode 100644 index 0000000..346c7fe --- /dev/null +++ b/openbsd-compat/bindresvport.c @@ -0,0 +1,120 @@ +/* This file has be substantially modified from the original OpenBSD source */ + +/* $OpenBSD: bindresvport.c,v 1.17 2005/12/21 01:40:22 millert Exp $ */ + +/* + * Copyright 1996, Jason Downs. All rights reserved. + * Copyright 1998, Theo de Raadt. All rights reserved. + * Copyright 2000, Damien Miller. 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. + * + * THIS SOFTWARE IS PROVIDED BY THE AUTHOR ``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 AUTHOR 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. + */ + +/* OPENBSD ORIGINAL: lib/libc/rpc/bindresvport.c */ + +#include "includes.h" + +#ifndef HAVE_BINDRESVPORT_SA +#include <sys/types.h> +#include <sys/socket.h> + +#include <netinet/in.h> +#include <arpa/inet.h> + +#include <errno.h> +#include <stdlib.h> +#include <string.h> + +#define STARTPORT 600 +#define ENDPORT (IPPORT_RESERVED - 1) +#define NPORTS (ENDPORT - STARTPORT + 1) + +/* + * Bind a socket to a privileged IP port + */ +int +bindresvport_sa(int sd, struct sockaddr *sa) +{ + int error, af; + struct sockaddr_storage myaddr; + struct sockaddr_in *in; + struct sockaddr_in6 *in6; + u_int16_t *portp; + u_int16_t port; + socklen_t salen; + int i; + + if (sa == NULL) { + memset(&myaddr, 0, sizeof(myaddr)); + sa = (struct sockaddr *)&myaddr; + salen = sizeof(myaddr); + + if (getsockname(sd, sa, &salen) == -1) + return -1; /* errno is correctly set */ + + af = sa->sa_family; + memset(&myaddr, 0, salen); + } else + af = sa->sa_family; + + if (af == AF_INET) { + in = (struct sockaddr_in *)sa; + salen = sizeof(struct sockaddr_in); + portp = &in->sin_port; + } else if (af == AF_INET6) { + in6 = (struct sockaddr_in6 *)sa; + salen = sizeof(struct sockaddr_in6); + portp = &in6->sin6_port; + } else { + errno = EPFNOSUPPORT; + return (-1); + } + sa->sa_family = af; + + port = ntohs(*portp); + if (port == 0) + port = arc4random_uniform(NPORTS) + STARTPORT; + + /* Avoid warning */ + error = -1; + + for(i = 0; i < NPORTS; i++) { + *portp = htons(port); + + error = bind(sd, sa, salen); + + /* Terminate on success */ + if (error == 0) + break; + + /* Terminate on errors, except "address already in use" */ + if ((error < 0) && !((errno == EADDRINUSE) || (errno == EINVAL))) + break; + + port++; + if (port > ENDPORT) + port = STARTPORT; + } + + return (error); +} + +#endif /* HAVE_BINDRESVPORT_SA */ |