/* -*- 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 <sys/types.h>

#include <net/if.h>

#include <netdb.h>

#include "mozilla/DebugOnly.h"

#include "mozilla/ScopeExit.h"

#include "NetworkInfoServiceImpl.h"

namespace mozilla {

namespace net {

static nsresult

ListInterfaceAddresses(int aFd, const char* aIface, 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];

    int family;

    switch(family=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.Put(ifaceStr, addrStr);

    return NS_OK;

}

} // namespace net

} // namespace mozilla