1 /* -*- Mode: C++; tab-width: 8; indent-tabs-mode: nil; c-basic-offset: 2 -*- */
2 /* vim: set ts=8 sts=2 et sw=2 tw=80: */
3 /* This Source Code Form is subject to the terms of the Mozilla Public
4 * License, v. 2.0. If a copy of the MPL was not distributed with this
5 * file, You can obtain one at http://mozilla.org/MPL/2.0/. */
6
7 #include <string.h>
8 #include <unistd.h>
9 #include <sys/ioctl.h>
10 #include <sys/socket.h>
11 #include <sys/types.h>
12 #include <net/if.h>
13 #include <netdb.h>
14
15 #include "mozilla/DebugOnly.h"
16 #include "mozilla/ScopeExit.h"
17
18 #include "NetworkInfoServiceImpl.h"
19
20 namespace mozilla::net {
21
22 static nsresult ListInterfaceAddresses(int aFd, const char* aIface,
23 AddrMapType& aAddrMap);
24
DoListAddresses(AddrMapType & aAddrMap)25 nsresult DoListAddresses(AddrMapType& aAddrMap) {
26 int fd = socket(AF_INET, SOCK_DGRAM, 0);
27 if (fd < 0) {
28 return NS_ERROR_FAILURE;
29 }
30
31 auto autoCloseSocket = MakeScopeExit([&] { close(fd); });
32
33 struct ifconf ifconf;
34 /* 16k of space should be enough to list all interfaces. Worst case, if it's
35 * not then we will error out and fail to list addresses. This should only
36 * happen on pathological machines with way too many interfaces.
37 */
38 char buf[16384];
39
40 ifconf.ifc_len = sizeof(buf);
41 ifconf.ifc_buf = buf;
42 if (ioctl(fd, SIOCGIFCONF, &ifconf) != 0) {
43 return NS_ERROR_FAILURE;
44 }
45
46 struct ifreq* ifreq = ifconf.ifc_req;
47 int i = 0;
48 while (i < ifconf.ifc_len) {
49 size_t len = sizeof(struct ifreq);
50
51 DebugOnly<nsresult> rv =
52 ListInterfaceAddresses(fd, ifreq->ifr_name, aAddrMap);
53 NS_WARNING_ASSERTION(NS_SUCCEEDED(rv), "ListInterfaceAddresses failed");
54
55 ifreq = (struct ifreq*)((char*)ifreq + len);
56 i += len;
57 }
58
59 return NS_OK;
60 }
61
ListInterfaceAddresses(int aFd,const char * aInterface,AddrMapType & aAddrMap)62 static nsresult ListInterfaceAddresses(int aFd, const char* aInterface,
63 AddrMapType& aAddrMap) {
64 struct ifreq ifreq;
65 memset(&ifreq, 0, sizeof(struct ifreq));
66 strncpy(ifreq.ifr_name, aInterface, IFNAMSIZ - 1);
67 if (ioctl(aFd, SIOCGIFADDR, &ifreq) != 0) {
68 return NS_ERROR_FAILURE;
69 }
70
71 char host[128];
72 switch (ifreq.ifr_addr.sa_family) {
73 case AF_INET:
74 case AF_INET6:
75 getnameinfo(&ifreq.ifr_addr, sizeof(ifreq.ifr_addr), host, sizeof(host),
76 nullptr, 0, NI_NUMERICHOST);
77 break;
78 case AF_UNSPEC:
79 return NS_OK;
80 default:
81 // Unknown family.
82 return NS_OK;
83 }
84
85 nsCString ifaceStr;
86 ifaceStr.AssignASCII(aInterface);
87
88 nsCString addrStr;
89 addrStr.AssignASCII(host);
90
91 aAddrMap.Put(ifaceStr, addrStr);
92
93 return NS_OK;
94 }
95
96 } // namespace mozilla::net
97