zerotiertspu/osdep/LinuxNetLink.cpp

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12 KiB
C++

/*
* ZeroTier One - Network Virtualization Everywhere
* Copyright (C) 2011-2018 ZeroTier, Inc. https://www.zerotier.com/
*
* This program is free software: you can redistribute it and/or modify
* it under the terms of the GNU General Public License as published by
* the Free Software Foundation, either version 3 of the License, or
* (at your option) any later version.
*
* This program is distributed in the hope that it will be useful,
* but WITHOUT ANY WARRANTY; without even the implied warranty of
* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
* GNU General Public License for more details.
*
* You should have received a copy of the GNU General Public License
* along with this program. If not, see <http://www.gnu.org/licenses/>.
*
* --
*
* You can be released from the requirements of the license by purchasing
* a commercial license. Buying such a license is mandatory as soon as you
* develop commercial closed-source software that incorporates or links
* directly against ZeroTier software without disclosing the source code
* of your own application.
*/
#include "LinuxNetLink.hpp"
#include <unistd.h>
namespace ZeroTier {
LinuxNetLink::LinuxNetLink()
: _t()
, _running(false)
, _routes_ipv4()
, _routes_ipv6()
, _seq(0)
, _fd(socket(AF_NETLINK, SOCK_RAW, NETLINK_ROUTE))
, _la({0})
{
// set socket timeout to 1 sec so we're not permablocking recv() calls
struct timeval tv;
tv.tv_sec = 1;
tv.tv_usec = 0;
if(setsockopt(_fd, SOL_SOCKET, SO_RCVTIMEO, (const char*)&tv, sizeof(tv)) != 0) {
fprintf(stderr, "setsockopt failed: %s\n", strerror(errno));
}
_la.nl_family = AF_NETLINK;
_la.nl_pid = getpid();
_la.nl_groups = RTMGRP_LINK|RTMGRP_IPV4_IFADDR|RTMGRP_IPV6_IFADDR|RTMGRP_IPV4_ROUTE|RTMGRP_IPV6_ROUTE|RTMGRP_NOTIFY;
if (bind(_fd, (struct sockaddr*)&_la, sizeof(_la))) {
fprintf(stderr, "Error connecting to RTNETLINK: %s\n", strerror(errno));
::exit(1);
}
_running = true;
_t = Thread::start(this);
fprintf(stderr, "Requesting IPV4 Routes\n");
_requestIPv4Routes();
Thread::sleep(10);
fprintf(stderr, "Requesting IPV6 Routes\n");
_requestIPv6Routes();
}
LinuxNetLink::~LinuxNetLink()
{
_running = false;
Thread::join(_t);
::close(_fd);
}
void LinuxNetLink::threadMain() throw()
{
char buf[8192];
char *p = NULL;
struct nlmsghdr *nlp;
int nll = 0;
int rtn = 0;
p = buf;
while(_running) {
rtn = recv(_fd, p, sizeof(buf) - nll, 0);
if (rtn > 0) {
nlp = (struct nlmsghdr *)p;
if(nlp->nlmsg_type == NLMSG_ERROR && (nlp->nlmsg_flags & NLM_F_ACK) != NLM_F_ACK) {
fprintf(stderr, "NLMSG_ERROR\n");
struct nlmsgerr *err = (struct nlmsgerr*)NLMSG_DATA(nlp);
if (err->error != 0) {
fprintf(stderr, "rtnetlink error: %s\n", strerror(-(err->error)));
}
p = buf;
nll = 0;
continue;
}
if (nlp->nlmsg_type == NLMSG_NOOP) {
fprintf(stderr, "noop\n");
continue;
}
if( (nlp->nlmsg_flags & NLM_F_MULTI) == NLM_F_MULTI || (nlp->nlmsg_type == NLMSG_DONE))
{
if (nlp->nlmsg_type == NLMSG_DONE) {
_processMessage(nlp, nll);
p = buf;
nll = 0;
continue;
}
p += rtn;
nll += rtn;
}
if (nlp->nlmsg_type == NLMSG_OVERRUN) {
fprintf(stderr, "NLMSG_OVERRUN: Data lost\n");
p = buf;
nll = 0;
continue;
}
nll += rtn;
_processMessage(nlp, nll);
p = buf;
nll = 0;
}
else {
Thread::sleep(100);
continue;
}
}
}
void LinuxNetLink::_processMessage(struct nlmsghdr *nlp, int nll)
{
for(; NLMSG_OK(nlp, nll); nlp=NLMSG_NEXT(nlp, nll))
{
switch(nlp->nlmsg_type)
{
case RTM_NEWLINK:
_linkAdded(nlp);
break;
case RTM_DELLINK:
_linkDeleted(nlp);
break;
case RTM_NEWADDR:
_ipAddressAdded(nlp);
break;
case RTM_DELADDR:
_ipAddressDeleted(nlp);
break;
case RTM_NEWROUTE:
_routeAdded(nlp);
break;
case RTM_DELROUTE:
_routeDeleted(nlp);
break;
default:
fprintf(stderr, "ignore msgtype %d...\n", nlp->nlmsg_type);
}
}
}
void LinuxNetLink::_ipAddressAdded(struct nlmsghdr *nlp)
{
struct ifaddrmsg *ifap = (struct ifaddrmsg *)NLMSG_DATA(nlp);
struct rtattr *rtap = (struct rtattr *)IFA_RTA(ifap);
int ifal = IFA_PAYLOAD(nlp);
char addr[40] = {0};
char local[40] = {0};
char label[40] = {0};
char bcast[40] = {0};
for(;RTA_OK(rtap, ifal); rtap=RTA_NEXT(rtap,ifal))
{
switch(rtap->rta_type) {
case IFA_ADDRESS:
inet_ntop(ifap->ifa_family, RTA_DATA(rtap), addr, 40);
break;
case IFA_LOCAL:
inet_ntop(ifap->ifa_family, RTA_DATA(rtap), local, 40);
break;
case IFA_LABEL:
memcpy(label, RTA_DATA(rtap), 40);
break;
case IFA_BROADCAST:
inet_ntop(ifap->ifa_family, RTA_DATA(rtap), bcast, 40);
break;
}
}
fprintf(stderr, "Added IP Address %s local: %s label: %s broadcast: %s\n", addr, local, label, bcast);
}
void LinuxNetLink::_ipAddressDeleted(struct nlmsghdr *nlp)
{
struct ifaddrmsg *ifap = (struct ifaddrmsg *)NLMSG_DATA(nlp);
struct rtattr *rtap = (struct rtattr *)IFA_RTA(ifap);
int ifal = IFA_PAYLOAD(nlp);
char addr[40] = {0};
char local[40] = {0};
char label[40] = {0};
char bcast[40] = {0};
for(;RTA_OK(rtap, ifal); rtap=RTA_NEXT(rtap,ifal))
{
switch(rtap->rta_type) {
case IFA_ADDRESS:
inet_ntop(ifap->ifa_family, RTA_DATA(rtap), addr, 40);
break;
case IFA_LOCAL:
inet_ntop(ifap->ifa_family, RTA_DATA(rtap), local, 40);
break;
case IFA_LABEL:
memcpy(label, RTA_DATA(rtap), 40);
break;
case IFA_BROADCAST:
inet_ntop(ifap->ifa_family, RTA_DATA(rtap), bcast, 40);
break;
}
}
fprintf(stderr, "Removed IP Address %s local: %s label: %s broadcast: %s\n", addr, local, label, bcast);
}
void LinuxNetLink::_routeAdded(struct nlmsghdr *nlp)
{
char dsts[40] = {0};
char gws[40] = {0};
char ifs[16] = {0};
char ms[24] = {0};
struct rtmsg *rtp = (struct rtmsg *) NLMSG_DATA(nlp);
struct rtattr *rtap = (struct rtattr *)RTM_RTA(rtp);
int rtl = RTM_PAYLOAD(nlp);
for(;RTA_OK(rtap, rtl); rtap=RTA_NEXT(rtap, rtl))
{
switch(rtap->rta_type)
{
case RTA_DST:
inet_ntop(rtp->rtm_family, RTA_DATA(rtap), dsts, rtp->rtm_family == AF_INET ? 24 : 40);
break;
case RTA_GATEWAY:
inet_ntop(rtp->rtm_family, RTA_DATA(rtap), gws, rtp->rtm_family == AF_INET ? 24 : 40);
break;
case RTA_OIF:
sprintf(ifs, "%d", *((int*)RTA_DATA(rtap)));
break;
}
}
sprintf(ms, "%d", rtp->rtm_dst_len);
fprintf(stderr, "Route Added: dst %s/%s gw %s if %s\n", dsts, ms, gws, ifs);
}
void LinuxNetLink::_routeDeleted(struct nlmsghdr *nlp)
{
char dsts[40] = {0};
char gws[40] = {0};
char ifs[16] = {0};
char ms[24] = {0};
struct rtmsg *rtp = (struct rtmsg *) NLMSG_DATA(nlp);
struct rtattr *rtap = (struct rtattr *)RTM_RTA(rtp);
int rtl = RTM_PAYLOAD(nlp);
for(;RTA_OK(rtap, rtl); rtap=RTA_NEXT(rtap, rtl))
{
switch(rtap->rta_type)
{
case RTA_DST:
inet_ntop(rtp->rtm_family, RTA_DATA(rtap), dsts, rtp->rtm_family == AF_INET ? 24 : 40);
break;
case RTA_GATEWAY:
inet_ntop(rtp->rtm_family, RTA_DATA(rtap), gws, rtp->rtm_family == AF_INET ? 24 : 40);
break;
case RTA_OIF:
sprintf(ifs, "%d", *((int*)RTA_DATA(rtap)));
break;
}
}
sprintf(ms, "%d", rtp->rtm_dst_len);
fprintf(stderr, "Route Deleted: dst %s/%s gw %s if %s\n", dsts, ms, gws, ifs);
}
void LinuxNetLink::_linkAdded(struct nlmsghdr *nlp)
{
char mac[20] = {0};
unsigned int mtu = 0;
char ifname[40] = {0};
struct ifinfomsg *ifip = (struct ifinfomsg *)NLMSG_DATA(nlp);
struct rtattr *rtap = (struct rtattr *)IFLA_RTA(ifip);
int ifil = RTM_PAYLOAD(nlp);
const char *ptr;
unsigned char *ptr2;
for(;RTA_OK(rtap, ifil);rtap=RTA_NEXT(rtap, ifil))
{
switch(rtap->rta_type) {
case IFLA_ADDRESS:
ptr2 = (unsigned char*)RTA_DATA(rtap);
snprintf(mac, 20, "%02x:%02x:%02x:%02x:%02x:%02x",
ptr2[0], ptr2[1], ptr2[2], ptr2[3], ptr2[4], ptr2[5]);
break;
case IFLA_IFNAME:
ptr = (const char*)RTA_DATA(rtap);
memcpy(ifname, ptr, strlen(ptr));
break;
case IFLA_MTU:
memcpy(&mtu, RTA_DATA(rtap), sizeof(unsigned int));
break;
}
}
fprintf(stderr, "Link Added: %s mac: %s, mtu: %d\n", ifname, mac, mtu);
}
void LinuxNetLink::_linkDeleted(struct nlmsghdr *nlp)
{
char mac[20] = {0};
unsigned int mtu = 0;
char ifname[40] = {0};
struct ifinfomsg *ifip = (struct ifinfomsg *)NLMSG_DATA(nlp);
struct rtattr *rtap = (struct rtattr *)IFLA_RTA(ifip);
int ifil = RTM_PAYLOAD(nlp);
const char *ptr;
unsigned char *ptr2;
for(;RTA_OK(rtap, ifil);rtap=RTA_NEXT(rtap, ifil))
{
switch(rtap->rta_type) {
case IFLA_ADDRESS:
ptr2 = (unsigned char*)RTA_DATA(rtap);
snprintf(mac, 20, "%02x:%02x:%02x:%02x:%02x:%02x",
ptr2[0], ptr2[1], ptr2[2], ptr2[3], ptr2[4], ptr2[5]);
break;
case IFLA_IFNAME:
ptr = (const char*)RTA_DATA(rtap);
memcpy(ifname, ptr, strlen(ptr));
break;
case IFLA_MTU:
memcpy(&mtu, RTA_DATA(rtap), sizeof(unsigned int));
break;
}
}
fprintf(stderr, "Link Deleted: %s mac: %s, mtu: %d\n", ifname, mac, mtu);
}
void LinuxNetLink::_requestIPv4Routes()
{
struct nl_req req;
bzero(&req, sizeof(req));
req.nl.nlmsg_len = NLMSG_LENGTH(sizeof(struct rtmsg));
req.nl.nlmsg_flags = NLM_F_REQUEST | NLM_F_DUMP;
req.nl.nlmsg_type = RTM_GETROUTE;
req.nl.nlmsg_pid = 0;
req.nl.nlmsg_seq = ++_seq;
req.rt.rtm_family = AF_INET;
req.rt.rtm_table = RT_TABLE_MAIN;
struct sockaddr_nl pa;
bzero(&pa, sizeof(pa));
pa.nl_family = AF_NETLINK;
struct msghdr msg;
bzero(&msg, sizeof(msg));
msg.msg_name = (void*)&pa;
msg.msg_namelen = sizeof(pa);
struct iovec iov;
bzero(&iov, sizeof(iov));
iov.iov_base = (void*)&req.nl;
iov.iov_len = req.nl.nlmsg_len;
msg.msg_iov = &iov;
msg.msg_iovlen = 1;
sendmsg(_fd, &msg, 0);
}
void LinuxNetLink::_requestIPv6Routes()
{
struct nl_req req;
bzero(&req, sizeof(req));
req.nl.nlmsg_len = NLMSG_LENGTH(sizeof(struct rtmsg));
req.nl.nlmsg_flags = NLM_F_REQUEST | NLM_F_DUMP;
req.nl.nlmsg_type = RTM_GETROUTE;
req.nl.nlmsg_pid = 0;
req.nl.nlmsg_seq = ++_seq;
req.rt.rtm_family = AF_INET6;
req.rt.rtm_table = RT_TABLE_MAIN;
struct sockaddr_nl pa;
bzero(&pa, sizeof(pa));
pa.nl_family = AF_NETLINK;
struct msghdr msg;
bzero(&msg, sizeof(msg));
msg.msg_name = (void*)&pa;
msg.msg_namelen = sizeof(pa);
struct iovec iov;
bzero(&iov, sizeof(iov));
iov.iov_base = (void*)&req.nl;
iov.iov_len = req.nl.nlmsg_len;
msg.msg_iov = &iov;
msg.msg_iovlen = 1;
while((sendmsg(_fd, &msg, 0)) == -1) {
fprintf(stderr, "ipv6 waiting...");
Thread::sleep(100);
}
}
void LinuxNetLink::addRoute(const InetAddress &target, const InetAddress &via, const char *ifaceName)
{
}
void LinuxNetLink::delRoute(const InetAddress &target, const InetAddress &via, const char *ifaceName)
{
}
void LinuxNetLink::addInterface(const char *iface, unsigned int mtu)
{
}
void LinuxNetLink::addAddress(const InetAddress &addr, const char *iface)
{
}
RouteList LinuxNetLink::getIPV4Routes() const
{
return _routes_ipv4;
}
RouteList LinuxNetLink::getIPV6Routes() const
{
return _routes_ipv6;
}
} // namespace ZeroTier