miniupnp/miniupnpd/linux/ifacewatcher.c

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/* $Id: ifacewatcher.c,v 1.7 2012/05/27 22:16:10 nanard Exp $ */
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/* MiniUPnP project
* http://miniupnp.free.fr/ or http://miniupnp.tuxfamily.org/
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* (c) 2006-2015 Thomas Bernard
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*
* ifacewatcher.c
*
* This file implements dynamic serving of new network interfaces
* which weren't available during daemon start. It also takes care
* of interfaces which become unavailable.
*
* Copyright (c) 2011, Alexey Osipov <simba@lerlan.ru>
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* All rights reserved.
*
* Redistribution and use in source and binary forms, with or without
* modification, are permitted provided that the following conditions are met:
*
* * Redistributions of source code must retain the above copyright notice,
* this list of conditions and the following disclaimer.
* * Redistributions in binary form must reproduce the above copyright notice,
* this list of conditions and the following disclaimer in the documentation
* and/or other materials provided with the distribution.
* * The name of the author may not be used to endorse or promote products
* derived from this software without specific prior written permission.
*
* THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS "AS IS"
* AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
* IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
* ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT OWNER OR CONTRIBUTORS BE
* LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR
* CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF
* SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS
* INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN
* CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE)
* ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE
* POSSIBILITY OF SUCH DAMAGE. */
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#include <stdio.h>
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#include <sys/types.h>
#include <sys/socket.h>
#include <linux/netlink.h>
#include <linux/rtnetlink.h>
#include <arpa/inet.h>
#include <net/if.h>
#include <syslog.h>
#include <string.h>
#include <unistd.h>
#include <stdlib.h>
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#include <signal.h>
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#include "../config.h"
#ifdef USE_IFACEWATCHER
#include "../ifacewatcher.h"
#include "../minissdp.h"
#include "../getifaddr.h"
#include "../upnpglobalvars.h"
#include "../natpmp.h"
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extern volatile sig_atomic_t should_send_public_address_change_notif;
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int
OpenAndConfInterfaceWatchSocket(void)
{
int s;
struct sockaddr_nl addr;
s = socket(PF_NETLINK, SOCK_RAW, NETLINK_ROUTE);
if (s == -1)
{
syslog(LOG_ERR, "socket(PF_NETLINK, SOCK_RAW, NETLINK_ROUTE): %m");
return -1;
}
memset(&addr, 0, sizeof(addr));
addr.nl_family = AF_NETLINK;
addr.nl_groups = RTMGRP_LINK | RTMGRP_IPV4_IFADDR;
/*addr.nl_groups = RTMGRP_LINK | RTMGRP_IPV4_IFADDR | RTMGRP_IPV6_IFADDR;*/
if (bind(s, (struct sockaddr *)&addr, sizeof(addr)) < 0)
{
syslog(LOG_ERR, "bind(netlink): %m");
close(s);
return -1;
}
return s;
}
#if 0
/* disabled at the moment */
int
ProcessInterfaceUp(struct ifinfomsg *ifi)
{
struct lan_iface_s * lan_iface;
struct lan_iface_s * lan_iface2;
struct lan_addr_s * lan_addr;
char ifname[IFNAMSIZ];
char ifstraddr[16];
struct in_addr ifaddr;
/* check if we already have this iface */
for(lan_iface = lan_ifaces.lh_first; lan_iface != NULL; lan_iface = lan_iface->list.le_next)
if (lan_iface->iface.index == ifi->ifi_index)
break;
if (lan_iface != NULL)
return 0;
if (if_indextoname(ifi->ifi_index, ifname) == NULL)
{
syslog(LOG_ERR, "if_indextoname(%d, ifname) failed", ifi->ifi_index);
return -1;
}
if (getifaddr(ifname, ifstraddr, 16) < 0)
{
syslog(LOG_DEBUG, "getifaddr(%s, ifaddr, 16) failed", ifname);
return 1;
}
if (inet_pton(AF_INET, ifstraddr, &ifaddr) != 1)
{
syslog(LOG_ERR, "inet_pton(AF_INET, \"%s\", &ifaddr) failed", ifstraddr);
return -1;
}
/* check if this new interface has address which we need to listen to */
for(lan_addr = lan_addrs.lh_first; lan_addr != NULL; lan_addr = lan_addr->list.le_next)
{
if (lan_addr->addr.s_addr != ifaddr.s_addr)
continue;
syslog(LOG_INFO, "Interface up: %s (%s)", ifname, ifstraddr);
/* adding new lan_iface entry */
lan_iface = (struct lan_iface_s *) malloc(sizeof(struct lan_iface_s));
if (lan_iface == NULL)
{
syslog(LOG_ERR, "malloc(sizeof(struct lan_iface_s): %m");
continue;
}
lan_iface->lan_addr = lan_addr;
strncpy(lan_iface->iface.name, ifname, IFNAMSIZ);
lan_iface->iface.index = ifi->ifi_index;
lan_iface->iface.addr = ifaddr;
lan_iface->snotify = -1;
#ifdef ENABLE_NATPMP
lan_iface->snatpmp = -1;
#endif
LIST_INSERT_HEAD(&lan_ifaces, lan_iface, list);
/* adding multicast membership for SSDP */
if(AddMulticastMembership(sudp, ifaddr.s_addr, ifi->ifi_index) < 0)
syslog(LOG_WARNING, "Failed to add multicast membership for interface %s (%s)", ifname, ifstraddr);
else
syslog(LOG_INFO, "Multicast membership added for %s (%s)", ifname, ifstraddr);
/* create SSDP notify socket */
if (OpenAndConfSSDPNotifySocket(lan_iface) < 0)
syslog(LOG_WARNING, "Failed to open SSDP notify socket for interface %s (%s)", ifname, ifstraddr);
#ifdef ENABLE_NATPMP
/* create NAT-PMP socket */
for(lan_iface2 = lan_ifaces.lh_first; lan_iface2 != NULL; lan_iface2 = lan_iface2->list.le_next)
if (lan_iface2->lan_addr->addr.s_addr == lan_iface->lan_addr->addr.s_addr &&
lan_iface2->snatpmp >= 0)
lan_iface->snatpmp = lan_iface2->snatpmp;
if (lan_iface->snatpmp < 0)
{
lan_iface->snatpmp = OpenAndConfNATPMPSocket(ifaddr.s_addr);
if (lan_iface->snatpmp < 0)
syslog(LOG_ERR, "OpenAndConfNATPMPSocket(ifaddr.s_addr) failed for %s (%s)", ifname, ifstraddr);
else
syslog(LOG_INFO, "Listening for NAT-PMP connection on %s:%d", ifstraddr, NATPMP_PORT);
}
#endif
}
return 0;
}
int
ProcessInterfaceDown(struct ifinfomsg *ifi)
{
struct lan_iface_s * lan_iface;
struct lan_iface_s * lan_iface2;
/* check if we have this iface */
for(lan_iface = lan_ifaces.lh_first; lan_iface != NULL; lan_iface = lan_iface->list.le_next)
if (lan_iface->iface.index == ifi->ifi_index)
break;
if (lan_iface == NULL)
return 0;
/* one of our interfaces is going down, clean up */
syslog(LOG_INFO, "Interface down: %s", lan_iface->iface.name);
/* remove multicast membership for SSDP */
if(DropMulticastMembership(sudp, lan_iface->lan_addr->addr.s_addr, lan_iface->iface.index) < 0)
syslog(LOG_WARNING, "Failed to drop multicast membership for interface %s (%s)", lan_iface->iface.name, lan_iface->lan_addr->str);
else
syslog(LOG_INFO, "Multicast membership dropped for %s (%s)", lan_iface->iface.name, lan_iface->lan_addr->str);
/* closing SSDP notify socket */
close(lan_iface->snotify);
#ifdef ENABLE_NATPMP
/* closing NAT-PMP socket if it's not used anymore */
for(lan_iface2 = lan_ifaces.lh_first; lan_iface2 != NULL; lan_iface2 = lan_iface2->list.le_next)
if (lan_iface2 != lan_iface && lan_iface2->snatpmp == lan_iface->snatpmp)
break;
if (lan_iface2 == NULL)
close(lan_iface->snatpmp);
#endif
/* del corresponding lan_iface entry */
LIST_REMOVE(lan_iface, list);
free(lan_iface);
return 0;
}
#endif
void
ProcessInterfaceWatchNotify(int s)
{
char buffer[4096];
struct iovec iov;
struct msghdr hdr;
struct nlmsghdr *nlhdr;
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#if 0
/* disabled at the moment */
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struct ifinfomsg *ifi;
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#endif
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struct ifaddrmsg *ifa;
int len;
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struct rtattr *rth;
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int rtl;
unsigned int ext_if_name_index = 0;
iov.iov_base = buffer;
iov.iov_len = sizeof(buffer);
memset(&hdr, 0, sizeof(hdr));
hdr.msg_iov = &iov;
hdr.msg_iovlen = 1;
len = recvmsg(s, &hdr, 0);
if (len < 0)
{
syslog(LOG_ERR, "recvmsg(s, &hdr, 0): %m");
return;
}
if(ext_if_name) {
ext_if_name_index = if_nametoindex(ext_if_name);
}
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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int is_del = 0;
char address[48];
char ifname[IFNAMSIZ];
address[0] = '\0';
ifname[0] = '\0';
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if (nlhdr->nlmsg_type == NLMSG_DONE)
break;
switch(nlhdr->nlmsg_type) {
case RTM_DELLINK:
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is_del = 1;
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case RTM_NEWLINK:
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#if 0
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/* disabled at the moment */
ifi = (struct ifinfomsg *) NLMSG_DATA(nlhdr);
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if(is_del) {
if(ProcessInterfaceDown(ifi) < 0)
syslog(LOG_ERR, "ProcessInterfaceDown(ifi) failed");
} else {
if(ProcessInterfaceUp(ifi) < 0)
syslog(LOG_ERR, "ProcessInterfaceUp(ifi) failed");
}
#endif
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break;
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case RTM_DELADDR:
is_del = 1;
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case RTM_NEWADDR:
/* see /usr/include/linux/netlink.h
* and /usr/include/linux/rtnetlink.h */
ifa = (struct ifaddrmsg *) NLMSG_DATA(nlhdr);
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syslog(LOG_DEBUG, "%s %s index=%d fam=%d", "ProcessInterfaceWatchNotify",
is_del ? "RTM_DELADDR" : "RTM_NEWADDR",
ifa->ifa_index, ifa->ifa_family);
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for(rth = IFA_RTA(ifa), rtl = IFA_PAYLOAD(nlhdr);
rtl && RTA_OK(rth, rtl);
rth = RTA_NEXT(rth, rtl)) {
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char tmp[128];
memset(tmp, 0, sizeof(tmp));
switch(rth->rta_type) {
case IFA_ADDRESS:
case IFA_LOCAL:
case IFA_BROADCAST:
case IFA_ANYCAST:
inet_ntop(ifa->ifa_family, RTA_DATA(rth), tmp, sizeof(tmp));
if(rth->rta_type == IFA_ADDRESS)
strncpy(address, tmp, sizeof(address));
break;
case IFA_LABEL:
strncpy(tmp, RTA_DATA(rth), sizeof(tmp));
strncpy(ifname, tmp, sizeof(ifname));
break;
case IFA_CACHEINFO:
{
struct ifa_cacheinfo *cache_info;
cache_info = RTA_DATA(rth);
snprintf(tmp, sizeof(tmp), "valid=%u prefered=%u",
cache_info->ifa_valid, cache_info->ifa_prefered);
}
break;
default:
strncpy(tmp, "*unknown*", sizeof(tmp));
}
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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);
}
if(ifa->ifa_index == ext_if_name_index) {
should_send_public_address_change_notif = 1;
}
break;
default:
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syslog(LOG_DEBUG, "%s type %d ignored",
"ProcessInterfaceWatchNotify", nlhdr->nlmsg_type);
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}
}
}
#endif