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/* -*- Mode: C++; tab-width: 8; indent-tabs-mode: nil; c-basic-offset: 2 -*- */
/* vim: set ts=8 sts=2 et sw=2 tw=80: */
/* This Source Code Form is subject to the terms of the Mozilla Public
* License, v. 2.0. If a copy of the MPL was not distributed with this
* file, You can obtain one at http://mozilla.org/MPL/2.0/. */
#include <string.h>
#include <unistd.h>
#include <sys/ioctl.h>
#include <sys/socket.h>
#include <net/if.h>
#include <netdb.h>
#include "mozilla/DebugOnly.h"
#include "mozilla/ScopeExit.h"
#include "NetworkInfoServiceImpl.h"
namespace mozilla::net {
static nsresult ListInterfaceAddresses(int aFd, const char* aInterface,
AddrMapType& aAddrMap);
nsresult DoListAddresses(AddrMapType& aAddrMap) {
int fd = socket(AF_INET, SOCK_DGRAM, 0);
if (fd < 0) {
return NS_ERROR_FAILURE;
}
auto autoCloseSocket = MakeScopeExit([&] { close(fd); });
struct ifconf ifconf {};
/* 16k of space should be enough to list all interfaces. Worst case, if it's
* not then we will error out and fail to list addresses. This should only
* happen on pathological machines with way too many interfaces.
*/
char buf[16384];
ifconf.ifc_len = sizeof(buf);
ifconf.ifc_buf = buf;
if (ioctl(fd, SIOCGIFCONF, &ifconf) != 0) {
return NS_ERROR_FAILURE;
}
struct ifreq* ifreq = ifconf.ifc_req;
int i = 0;
while (i < ifconf.ifc_len) {
size_t len = sizeof(struct ifreq);
DebugOnly<nsresult> rv =
ListInterfaceAddresses(fd, ifreq->ifr_name, aAddrMap);
NS_WARNING_ASSERTION(NS_SUCCEEDED(rv), "ListInterfaceAddresses failed");
ifreq = (struct ifreq*)((char*)ifreq + len);
i += len;
}
return NS_OK;
}
static nsresult ListInterfaceAddresses(int aFd, const char* aInterface,
AddrMapType& aAddrMap) {
struct ifreq ifreq {};
memset(&ifreq, 0, sizeof(struct ifreq));
strncpy(ifreq.ifr_name, aInterface, IFNAMSIZ - 1);
if (ioctl(aFd, SIOCGIFADDR, &ifreq) != 0) {
return NS_ERROR_FAILURE;
}
char host[128];
switch (ifreq.ifr_addr.sa_family) {
case AF_INET:
case AF_INET6:
getnameinfo(&ifreq.ifr_addr, sizeof(ifreq.ifr_addr), host, sizeof(host),
nullptr, 0, NI_NUMERICHOST);
break;
case AF_UNSPEC:
return NS_OK;
default:
// Unknown family.
return NS_OK;
}
nsCString ifaceStr;
ifaceStr.AssignASCII(aInterface);
nsCString addrStr;
addrStr.AssignASCII(host);
aAddrMap.InsertOrUpdate(ifaceStr, addrStr);
return NS_OK;
}
} // namespace mozilla::net
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