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28f540f4 | 1 | /* |
a7ab6ec8 | 2 | * Copyright (c) 2010, Oracle America, Inc. |
cb636bb2 | 3 | * |
a7ab6ec8 UD |
4 | * Redistribution and use in source and binary forms, with or without |
5 | * modification, are permitted provided that the following conditions are | |
6 | * met: | |
cb636bb2 | 7 | * |
a7ab6ec8 UD |
8 | * * Redistributions of source code must retain the above copyright |
9 | * notice, this list of conditions and the following disclaimer. | |
10 | * * Redistributions in binary form must reproduce the above | |
11 | * copyright notice, this list of conditions and the following | |
12 | * disclaimer in the documentation and/or other materials | |
13 | * provided with the distribution. | |
14 | * * Neither the name of the "Oracle America, Inc." nor the names of its | |
15 | * contributors may be used to endorse or promote products derived | |
16 | * from this software without specific prior written permission. | |
c4029823 | 17 | * |
a7ab6ec8 UD |
18 | * THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS |
19 | * "AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT | |
20 | * LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS | |
21 | * FOR A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE | |
22 | * COPYRIGHT HOLDER OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, | |
23 | * INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL | |
24 | * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE | |
25 | * GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS | |
26 | * INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, | |
27 | * WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING | |
28 | * NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE | |
29 | * OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE. | |
28f540f4 RM |
30 | */ |
31 | ||
f8afba91 | 32 | #include <errno.h> |
e7fd8a39 UD |
33 | #include <unistd.h> |
34 | #include <string.h> | |
28f540f4 | 35 | #include <sys/types.h> |
28f540f4 RM |
36 | #include <sys/socket.h> |
37 | #include <netinet/in.h> | |
ec999b8e | 38 | #include <libc-lock.h> |
f6da27e5 PH |
39 | |
40 | /* | |
41 | * Locks the static variables in this file. | |
42 | */ | |
43 | __libc_lock_define_initialized (static, lock); | |
28f540f4 RM |
44 | |
45 | /* | |
46 | * Bind a socket to a privileged IP port | |
47 | */ | |
e7fd8a39 UD |
48 | int |
49 | bindresvport (int sd, struct sockaddr_in *sin) | |
28f540f4 | 50 | { |
e7fd8a39 UD |
51 | static short port; |
52 | struct sockaddr_in myaddr; | |
e7fd8a39 | 53 | int i; |
28f540f4 RM |
54 | |
55 | #define STARTPORT 600 | |
8fd2bb35 | 56 | #define LOWPORT 512 |
28f540f4 RM |
57 | #define ENDPORT (IPPORT_RESERVED - 1) |
58 | #define NPORTS (ENDPORT - STARTPORT + 1) | |
3a0cd663 | 59 | static short startport = STARTPORT; |
28f540f4 | 60 | |
e7fd8a39 UD |
61 | if (sin == (struct sockaddr_in *) 0) |
62 | { | |
63 | sin = &myaddr; | |
d99431e5 | 64 | memset (sin, 0, sizeof (*sin)); |
e7fd8a39 UD |
65 | sin->sin_family = AF_INET; |
66 | } | |
67 | else if (sin->sin_family != AF_INET) | |
68 | { | |
173b756d | 69 | __set_errno (EAFNOSUPPORT); |
e7fd8a39 UD |
70 | return -1; |
71 | } | |
f8afba91 | 72 | |
e7fd8a39 UD |
73 | if (port == 0) |
74 | { | |
50304ef0 | 75 | port = (__getpid () % NPORTS) + STARTPORT; |
e7fd8a39 | 76 | } |
8fd2bb35 UD |
77 | |
78 | /* Initialize to make gcc happy. */ | |
79 | int res = -1; | |
f8afba91 | 80 | |
3a0cd663 | 81 | int nports = ENDPORT - startport + 1; |
15a493c3 | 82 | int endport = ENDPORT; |
f6da27e5 PH |
83 | |
84 | __libc_lock_lock (lock); | |
85 | ||
3a0cd663 | 86 | again: |
8fd2bb35 | 87 | for (i = 0; i < nports; ++i) |
e7fd8a39 UD |
88 | { |
89 | sin->sin_port = htons (port++); | |
15a493c3 UD |
90 | if (port > endport) |
91 | port = startport; | |
b2bffca2 | 92 | res = __bind (sd, sin, sizeof (struct sockaddr_in)); |
8fd2bb35 UD |
93 | if (res >= 0 || errno != EADDRINUSE) |
94 | break; | |
e7fd8a39 | 95 | } |
f8afba91 | 96 | |
3a0cd663 UD |
97 | if (i == nports && startport != LOWPORT) |
98 | { | |
99 | startport = LOWPORT; | |
15a493c3 | 100 | endport = STARTPORT - 1; |
3a0cd663 | 101 | nports = STARTPORT - LOWPORT; |
15a493c3 | 102 | port = LOWPORT + port % (STARTPORT - LOWPORT); |
3a0cd663 UD |
103 | goto again; |
104 | } | |
105 | ||
f6da27e5 PH |
106 | __libc_lock_unlock (lock); |
107 | ||
e7fd8a39 | 108 | return res; |
28f540f4 | 109 | } |
a585ba22 | 110 | libc_hidden_def (bindresvport) |