354 lines
10 KiB
C
354 lines
10 KiB
C
/* $Id: ifacewatcher.c,v 1.10 2019/10/02 22:02:02 nanard Exp $ */
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/* MiniUPnP project
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* http://miniupnp.free.fr/ or https://miniupnp.tuxfamily.org/
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* (c) 2006-2020 Thomas Bernard
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*
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* ifacewatcher.c
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*
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* This file implements dynamic serving of new network interfaces
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* which weren't available during daemon start. It also takes care
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* of interfaces which become unavailable.
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*
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* Copyright (c) 2011, Alexey Osipov <simba@lerlan.ru>
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* All rights reserved.
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*
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* Redistribution and use in source and binary forms, with or without
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* modification, are permitted provided that the following conditions are met:
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*
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* * Redistributions of source code must retain the above copyright notice,
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* this list of conditions and the following disclaimer.
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* * Redistributions in binary form must reproduce the above copyright notice,
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* this list of conditions and the following disclaimer in the documentation
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* and/or other materials provided with the distribution.
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* * The name of the author may not be used to endorse or promote products
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* derived from this software without specific prior written permission.
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*
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* THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS "AS IS"
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* AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
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* IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
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* ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT OWNER OR CONTRIBUTORS BE
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* LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR
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* CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF
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* SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS
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* INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN
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* CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE)
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* ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE
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* POSSIBILITY OF SUCH DAMAGE. */
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#include <stdio.h>
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#include <sys/types.h>
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#include <sys/socket.h>
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#include <linux/netlink.h>
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#include <linux/rtnetlink.h>
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#include <arpa/inet.h>
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#include <net/if.h>
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#include <syslog.h>
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#include <string.h>
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#include <unistd.h>
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#include <stdlib.h>
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#include <signal.h>
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#include "config.h"
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#include "../macros.h"
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#ifdef USE_IFACEWATCHER
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#include "../ifacewatcher.h"
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#include "../minissdp.h"
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#include "../getifaddr.h"
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#include "../upnpglobalvars.h"
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#include "../natpmp.h"
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extern volatile sig_atomic_t should_send_public_address_change_notif;
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int
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OpenAndConfInterfaceWatchSocket(void)
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{
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int s;
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struct sockaddr_nl addr;
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s = socket(PF_NETLINK, SOCK_RAW, NETLINK_ROUTE);
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if (s == -1)
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{
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syslog(LOG_ERR, "socket(PF_NETLINK, SOCK_RAW, NETLINK_ROUTE): %m");
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return -1;
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}
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memset(&addr, 0, sizeof(addr));
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addr.nl_family = AF_NETLINK;
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addr.nl_groups = RTMGRP_LINK | RTMGRP_IPV4_IFADDR;
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/*addr.nl_groups = RTMGRP_LINK | RTMGRP_IPV4_IFADDR | RTMGRP_IPV6_IFADDR;*/
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if (bind(s, (struct sockaddr *)&addr, sizeof(addr)) < 0)
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{
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syslog(LOG_ERR, "bind(netlink): %m");
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close(s);
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return -1;
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}
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return s;
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}
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#if 0
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/* disabled at the moment */
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int
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ProcessInterfaceUp(struct ifinfomsg *ifi)
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{
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struct lan_iface_s * lan_iface;
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struct lan_iface_s * lan_iface2;
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struct lan_addr_s * lan_addr;
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char ifname[IFNAMSIZ];
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char ifstraddr[16];
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struct in_addr ifaddr;
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/* check if we already have this iface */
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for(lan_iface = lan_ifaces.lh_first; lan_iface != NULL; lan_iface = lan_iface->list.le_next)
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if (lan_iface->iface.index == ifi->ifi_index)
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break;
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if (lan_iface != NULL)
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return 0;
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if (if_indextoname(ifi->ifi_index, ifname) == NULL)
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{
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syslog(LOG_ERR, "if_indextoname(%d, ifname) failed", ifi->ifi_index);
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return -1;
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}
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if (getifaddr(ifname, ifstraddr, 16) < 0)
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{
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syslog(LOG_DEBUG, "getifaddr(%s, ifaddr, 16) failed", ifname);
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return 1;
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}
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if (inet_pton(AF_INET, ifstraddr, &ifaddr) != 1)
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{
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syslog(LOG_ERR, "inet_pton(AF_INET, \"%s\", &ifaddr) failed", ifstraddr);
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return -1;
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}
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/* check if this new interface has address which we need to listen to */
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for(lan_addr = lan_addrs.lh_first; lan_addr != NULL; lan_addr = lan_addr->list.le_next)
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{
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if (lan_addr->addr.s_addr != ifaddr.s_addr)
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continue;
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syslog(LOG_INFO, "Interface up: %s (%s)", ifname, ifstraddr);
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/* adding new lan_iface entry */
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lan_iface = (struct lan_iface_s *) malloc(sizeof(struct lan_iface_s));
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if (lan_iface == NULL)
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{
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syslog(LOG_ERR, "malloc(sizeof(struct lan_iface_s): %m");
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continue;
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}
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lan_iface->lan_addr = lan_addr;
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strncpy(lan_iface->iface.name, ifname, IFNAMSIZ);
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lan_iface->iface.index = ifi->ifi_index;
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lan_iface->iface.addr = ifaddr;
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lan_iface->snotify = -1;
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#ifdef ENABLE_NATPMP
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lan_iface->snatpmp = -1;
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#endif
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LIST_INSERT_HEAD(&lan_ifaces, lan_iface, list);
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/* adding multicast membership for SSDP */
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if(AddMulticastMembership(sudp, ifaddr.s_addr, ifi->ifi_index) < 0)
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syslog(LOG_WARNING, "Failed to add multicast membership for interface %s (%s)", ifname, ifstraddr);
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else
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syslog(LOG_INFO, "Multicast membership added for %s (%s)", ifname, ifstraddr);
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/* create SSDP notify socket */
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if (OpenAndConfSSDPNotifySocket(lan_iface) < 0)
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syslog(LOG_WARNING, "Failed to open SSDP notify socket for interface %s (%s)", ifname, ifstraddr);
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#ifdef ENABLE_NATPMP
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/* create NAT-PMP socket */
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for(lan_iface2 = lan_ifaces.lh_first; lan_iface2 != NULL; lan_iface2 = lan_iface2->list.le_next)
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if (lan_iface2->lan_addr->addr.s_addr == lan_iface->lan_addr->addr.s_addr &&
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lan_iface2->snatpmp >= 0)
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lan_iface->snatpmp = lan_iface2->snatpmp;
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if (lan_iface->snatpmp < 0)
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{
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lan_iface->snatpmp = OpenAndConfNATPMPSocket(ifaddr.s_addr);
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if (lan_iface->snatpmp < 0)
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syslog(LOG_ERR, "OpenAndConfNATPMPSocket(ifaddr.s_addr) failed for %s (%s)", ifname, ifstraddr);
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else
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syslog(LOG_INFO, "Listening for NAT-PMP connection on %s:%d", ifstraddr, NATPMP_PORT);
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}
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#endif
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}
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return 0;
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}
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int
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ProcessInterfaceDown(struct ifinfomsg *ifi)
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{
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struct lan_iface_s * lan_iface;
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struct lan_iface_s * lan_iface2;
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/* check if we have this iface */
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for(lan_iface = lan_ifaces.lh_first; lan_iface != NULL; lan_iface = lan_iface->list.le_next)
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if (lan_iface->iface.index == ifi->ifi_index)
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break;
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if (lan_iface == NULL)
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return 0;
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/* one of our interfaces is going down, clean up */
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syslog(LOG_INFO, "Interface down: %s", lan_iface->iface.name);
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/* remove multicast membership for SSDP */
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if(DropMulticastMembership(sudp, lan_iface->lan_addr->addr.s_addr, lan_iface->iface.index) < 0)
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syslog(LOG_WARNING, "Failed to drop multicast membership for interface %s (%s)", lan_iface->iface.name, lan_iface->lan_addr->str);
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else
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syslog(LOG_INFO, "Multicast membership dropped for %s (%s)", lan_iface->iface.name, lan_iface->lan_addr->str);
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/* closing SSDP notify socket */
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close(lan_iface->snotify);
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#ifdef ENABLE_NATPMP
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/* closing NAT-PMP socket if it's not used anymore */
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for(lan_iface2 = lan_ifaces.lh_first; lan_iface2 != NULL; lan_iface2 = lan_iface2->list.le_next)
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if (lan_iface2 != lan_iface && lan_iface2->snatpmp == lan_iface->snatpmp)
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break;
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if (lan_iface2 == NULL)
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close(lan_iface->snatpmp);
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#endif
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/* del corresponding lan_iface entry */
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LIST_REMOVE(lan_iface, list);
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free(lan_iface);
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return 0;
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}
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#endif
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void
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ProcessInterfaceWatchNotify(int s)
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{
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char buffer[4096];
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struct iovec iov;
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struct msghdr hdr;
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struct nlmsghdr *nlhdr;
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#if 0
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/* disabled at the moment */
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struct ifinfomsg *ifi;
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#endif
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struct ifaddrmsg *ifa;
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int len;
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struct rtattr *rth;
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int rtl;
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unsigned int ext_if_name_index = 0;
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iov.iov_base = buffer;
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iov.iov_len = sizeof(buffer);
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memset(&hdr, 0, sizeof(hdr));
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hdr.msg_iov = &iov;
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hdr.msg_iovlen = 1;
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len = recvmsg(s, &hdr, 0);
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if (len < 0)
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{
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syslog(LOG_ERR, "recvmsg(s, &hdr, 0): %m");
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return;
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}
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if(ext_if_name) {
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ext_if_name_index = if_nametoindex(ext_if_name);
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}
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for (nlhdr = (struct nlmsghdr *) buffer;
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NLMSG_OK (nlhdr, (unsigned int)len);
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nlhdr = NLMSG_NEXT (nlhdr, len))
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{
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int is_del = 0;
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char address[48];
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char ifname[IFNAMSIZ];
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address[0] = '\0';
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ifname[0] = '\0';
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if (nlhdr->nlmsg_type == NLMSG_DONE)
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break;
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switch(nlhdr->nlmsg_type) {
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case RTM_DELLINK:
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is_del = 1;
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FALL_THROUGH;
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case RTM_NEWLINK:
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#if 0
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/* disabled at the moment */
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ifi = (struct ifinfomsg *) NLMSG_DATA(nlhdr);
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if(is_del) {
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if(ProcessInterfaceDown(ifi) < 0)
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syslog(LOG_ERR, "ProcessInterfaceDown(ifi) failed");
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} else {
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if(ProcessInterfaceUp(ifi) < 0)
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syslog(LOG_ERR, "ProcessInterfaceUp(ifi) failed");
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}
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#endif
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break;
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case RTM_DELADDR:
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is_del = 1;
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FALL_THROUGH;
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case RTM_NEWADDR:
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/* see /usr/include/linux/netlink.h
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* and /usr/include/linux/rtnetlink.h */
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ifa = (struct ifaddrmsg *) NLMSG_DATA(nlhdr);
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syslog(LOG_DEBUG, "%s %s index=%d fam=%d", "ProcessInterfaceWatchNotify",
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is_del ? "RTM_DELADDR" : "RTM_NEWADDR",
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ifa->ifa_index, ifa->ifa_family);
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for(rth = IFA_RTA(ifa), rtl = IFA_PAYLOAD(nlhdr);
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rtl && RTA_OK(rth, rtl);
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rth = RTA_NEXT(rth, rtl)) {
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char tmp[128];
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memset(tmp, 0, sizeof(tmp));
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switch(rth->rta_type) {
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case IFA_ADDRESS:
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case IFA_LOCAL:
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case IFA_BROADCAST:
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case IFA_ANYCAST:
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inet_ntop(ifa->ifa_family, RTA_DATA(rth), tmp, sizeof(tmp));
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if(rth->rta_type == IFA_ADDRESS)
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strncpy(address, tmp, sizeof(address));
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break;
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case IFA_LABEL:
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strncpy(tmp, RTA_DATA(rth), sizeof(tmp));
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strncpy(ifname, tmp, sizeof(ifname));
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break;
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case IFA_CACHEINFO:
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{
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struct ifa_cacheinfo *cache_info;
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cache_info = RTA_DATA(rth);
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snprintf(tmp, sizeof(tmp), "valid=%u preferred=%u",
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cache_info->ifa_valid, cache_info->ifa_prefered);
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}
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break;
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default:
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strncpy(tmp, "*unknown*", sizeof(tmp));
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}
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syslog(LOG_DEBUG, " - %u - %s type=%d",
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ifa->ifa_index, tmp,
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rth->rta_type);
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}
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if(ifa->ifa_index == ext_if_name_index) {
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should_send_public_address_change_notif = 1;
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}
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break;
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default:
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syslog(LOG_DEBUG, "%s type %d ignored",
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"ProcessInterfaceWatchNotify", nlhdr->nlmsg_type);
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}
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}
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}
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#endif
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