1 |
|
|
/* $OpenBSD: rresvport.c,v 1.11 2015/09/12 14:56:50 guenther Exp $ */ |
2 |
|
|
/* |
3 |
|
|
* Copyright (c) 1995, 1996, 1998 Theo de Raadt. All rights reserved. |
4 |
|
|
* Copyright (c) 1983, 1993, 1994 |
5 |
|
|
* The Regents of the University of California. All rights reserved. |
6 |
|
|
* |
7 |
|
|
* Redistribution and use in source and binary forms, with or without |
8 |
|
|
* modification, are permitted provided that the following conditions |
9 |
|
|
* are met: |
10 |
|
|
* 1. Redistributions of source code must retain the above copyright |
11 |
|
|
* notice, this list of conditions and the following disclaimer. |
12 |
|
|
* 2. Redistributions in binary form must reproduce the above copyright |
13 |
|
|
* notice, this list of conditions and the following disclaimer in the |
14 |
|
|
* documentation and/or other materials provided with the distribution. |
15 |
|
|
* 3. Neither the name of the University nor the names of its contributors |
16 |
|
|
* may be used to endorse or promote products derived from this software |
17 |
|
|
* without specific prior written permission. |
18 |
|
|
* |
19 |
|
|
* THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND |
20 |
|
|
* ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE |
21 |
|
|
* IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE |
22 |
|
|
* ARE DISCLAIMED. IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE |
23 |
|
|
* FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL |
24 |
|
|
* DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS |
25 |
|
|
* OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) |
26 |
|
|
* HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT |
27 |
|
|
* LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY |
28 |
|
|
* OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF |
29 |
|
|
* SUCH DAMAGE. |
30 |
|
|
*/ |
31 |
|
|
|
32 |
|
|
#include <sys/socket.h> |
33 |
|
|
#include <sys/stat.h> |
34 |
|
|
|
35 |
|
|
#include <netinet/in.h> |
36 |
|
|
#include <arpa/inet.h> |
37 |
|
|
|
38 |
|
|
#include <signal.h> |
39 |
|
|
#include <fcntl.h> |
40 |
|
|
#include <netdb.h> |
41 |
|
|
#include <unistd.h> |
42 |
|
|
#include <pwd.h> |
43 |
|
|
#include <errno.h> |
44 |
|
|
#include <stdio.h> |
45 |
|
|
#include <ctype.h> |
46 |
|
|
#include <string.h> |
47 |
|
|
#include <syslog.h> |
48 |
|
|
#include <stdlib.h> |
49 |
|
|
#include <netgroup.h> |
50 |
|
|
|
51 |
|
|
int |
52 |
|
|
rresvport(int *alport) |
53 |
|
|
{ |
54 |
|
|
return rresvport_af(alport, AF_INET); |
55 |
|
|
} |
56 |
|
|
|
57 |
|
|
|
58 |
|
|
int |
59 |
|
|
rresvport_af(int *alport, int af) |
60 |
|
|
{ |
61 |
|
|
struct sockaddr_storage ss; |
62 |
|
|
struct sockaddr *sa; |
63 |
|
|
u_int16_t *portp; |
64 |
|
|
int s; |
65 |
|
|
|
66 |
|
|
bzero(&ss, sizeof ss); |
67 |
|
|
sa = (struct sockaddr *)&ss; |
68 |
|
|
|
69 |
|
|
switch (af) { |
70 |
|
|
case AF_INET: |
71 |
|
|
sa->sa_len = sizeof(struct sockaddr_in); |
72 |
|
|
portp = &((struct sockaddr_in *)sa)->sin_port; |
73 |
|
|
break; |
74 |
|
|
case AF_INET6: |
75 |
|
|
sa->sa_len = sizeof(struct sockaddr_in6); |
76 |
|
|
portp = &((struct sockaddr_in6 *)sa)->sin6_port; |
77 |
|
|
break; |
78 |
|
|
default: |
79 |
|
|
errno = EPFNOSUPPORT; |
80 |
|
|
return (-1); |
81 |
|
|
} |
82 |
|
|
sa->sa_family = af; |
83 |
|
|
|
84 |
|
|
s = socket(af, SOCK_STREAM, 0); |
85 |
|
|
if (s < 0) |
86 |
|
|
return (-1); |
87 |
|
|
|
88 |
|
|
*portp = htons(*alport); |
89 |
|
|
if (*alport < IPPORT_RESERVED - 1) { |
90 |
|
|
if (bind(s, sa, sa->sa_len) >= 0) |
91 |
|
|
return (s); |
92 |
|
|
if (errno != EADDRINUSE) { |
93 |
|
|
(void)close(s); |
94 |
|
|
return (-1); |
95 |
|
|
} |
96 |
|
|
} |
97 |
|
|
|
98 |
|
|
*portp = 0; |
99 |
|
|
sa->sa_family = af; |
100 |
|
|
if (bindresvport_sa(s, sa) == -1) { |
101 |
|
|
(void)close(s); |
102 |
|
|
return (-1); |
103 |
|
|
} |
104 |
|
|
*alport = ntohs(*portp); |
105 |
|
|
return (s); |
106 |
|
|
} |
107 |
|
|
DEF_WEAK(rresvport_af); |