root/src/utils/noit_getip.c

Revision 4157a34c3d13eb5c24a6f212ff058080a60a4ee5, 2.3 kB (checked in by Theo Schlossnagle <jesus@omniti.com>, 4 years ago)

closes #226

  • Property mode set to 100644
Line 
1 /*
2  * Copyright (c) 2010, OmniTI Computer Consulting, Inc.
3  * All rights reserved.
4  *
5  * Redistribution and use in source and binary forms, with or without
6  * modification, are permitted provided that the following conditions are
7  * met:
8  *
9  *    * Redistributions of source code must retain the above copyright
10  *      notice, this list of conditions and the following disclaimer.
11  *    * Redistributions in binary form must reproduce the above
12  *      copyright notice, this list of conditions and the following
13  *      disclaimer in the documentation and/or other materials provided
14  *      with the distribution.
15  *    * Neither the name OmniTI Computer Consulting, Inc. nor the names
16  *      of its contributors may be used to endorse or promote products
17  *      derived from this software without specific prior written
18  *      permission.
19  *
20  * THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS
21  * "AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT
22  * LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR
23  * A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT
24  * OWNER OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL,
25  * SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT
26  * LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE,
27  * DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY
28  * THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
29  * (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE
30  * OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
31  */
32
33 #include "noit_config.h"
34 #include "utils/noit_getip.h"
35 #include <netinet/in.h>
36 #include <sys/socket.h>
37 #include <unistd.h>
38 #include <errno.h>
39
40 int
41 noit_getip_ipv4(struct in_addr remote, struct in_addr *local) {
42   int s;
43   struct sockaddr_in r, l;
44   socklen_t llen;
45   s = socket(PF_INET, SOCK_DGRAM, 17); /* 17 is UDP */
46   if(s < 0) return -1;
47   memset(&r, 0, sizeof(r));
48   r.sin_port = htons(53); /* DNS port, it's fairly standard. */
49   r.sin_addr = remote;
50   r.sin_family = AF_INET;
51   if(connect(s, (struct sockaddr *)&r, sizeof(r)) < 0) {
52     close(s);
53     return -1;
54   }
55   llen = sizeof(l);
56   if(getsockname(s, (struct sockaddr *)&l, &llen) < 0) {
57     close(s);
58     return -1;
59   }
60   close(s);
61   *local = l.sin_addr;
62   return 0;
63 }
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