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Added LinuxNetLink to talk to the rtnetlink socket for adding interfaces, addresses routes. Not yet complete. Can currently monitor changes on the system.pull/1/head
Grant Limberg
8 years ago
6 changed files with 780 additions and 16 deletions
Binary file not shown.
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#include "osdep/LinuxNetLink.hpp" |
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using namespace ZeroTier; |
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int main(int argc, char **argv) |
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{ |
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LinuxNetLink &nl = LinuxNetLink::getInstance(); |
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while(true) { |
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Thread::sleep(1000); |
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} |
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} |
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/*
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* ZeroTier One - Network Virtualization Everywhere |
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* Copyright (C) 2011-2018 ZeroTier, Inc. https://www.zerotier.com/
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* |
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* This program is free software: you can redistribute it and/or modify |
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* it under the terms of the GNU General Public License as published by |
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* the Free Software Foundation, either version 3 of the License, or |
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* (at your option) any later version. |
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* |
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* This program is distributed in the hope that it will be useful, |
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* but WITHOUT ANY WARRANTY; without even the implied warranty of |
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* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the |
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* GNU General Public License for more details. |
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* |
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* You should have received a copy of the GNU General Public License |
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* along with this program. If not, see <http://www.gnu.org/licenses/>.
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* |
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* -- |
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* |
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* You can be released from the requirements of the license by purchasing |
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* a commercial license. Buying such a license is mandatory as soon as you |
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* develop commercial closed-source software that incorporates or links |
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* directly against ZeroTier software without disclosing the source code |
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* of your own application. |
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*/ |
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#include "LinuxNetLink.hpp" |
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#include <unistd.h> |
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namespace ZeroTier { |
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LinuxNetLink::LinuxNetLink() |
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: _t() |
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, _running(false) |
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, _routes_ipv4() |
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, _routes_ipv6() |
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, _fd(socket(AF_NETLINK, SOCK_RAW, NETLINK_ROUTE)) |
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, _la({0}) |
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, _pa({0}) |
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, _msg({0}) |
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, _iov({0}) |
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, _rtn(0) |
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, _nlp(NULL) |
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, _nll(0) |
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, _rtp(NULL) |
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, _rtl(0) |
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, _rtap(NULL) |
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, _ifip(NULL) |
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, _ifil(0) |
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, _ifap(NULL) |
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, _ifal(0) |
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{ |
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memset(_buf, 0, sizeof(_buf)); |
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// set socket timeout to 1 sec so we're not permablocking recv() calls
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struct timeval tv; |
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tv.tv_sec = 1; |
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tv.tv_usec = 0; |
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if(setsockopt(_fd, SOL_SOCKET, SO_RCVTIMEO, (const char*)&tv, sizeof(tv)) != 0) { |
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fprintf(stderr, "setsockopt failed: %s\n", strerror(errno)); |
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} |
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_la.nl_family = AF_NETLINK; |
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_la.nl_pid = getpid(); |
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_la.nl_groups = RTMGRP_LINK|RTMGRP_IPV4_IFADDR|RTMGRP_IPV6_IFADDR|RTMGRP_IPV4_ROUTE|RTMGRP_IPV6_ROUTE; |
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if (bind(_fd, (struct sockaddr*)&_la, sizeof(_la))) { |
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fprintf(stderr, "Error connecting to RTNETLINK: %s\n", strerror(errno)); |
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::exit(1); |
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} |
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_running = true; |
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_t = Thread::start(this); |
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fprintf(stderr, "Requesting IPV4 Routes\n"); |
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_requestIPv4Routes(); |
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Thread::sleep(10); |
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fprintf(stderr, "Requesting IPV6 Routes\n"); |
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_requestIPv6Routes(); |
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} |
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LinuxNetLink::~LinuxNetLink() |
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{ |
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_running = false; |
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Thread::join(_t); |
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::close(_fd); |
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} |
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void LinuxNetLink::threadMain() throw() |
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{ |
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char *p; |
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p = _buf; |
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_nll = 0; |
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while(_running) { |
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_rtn = recv(_fd, p, sizeof(_buf) - _nll, 0); |
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if (_rtn > 0) { |
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_nlp = (struct nlmsghdr *) p; |
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if(_nlp->nlmsg_type == NLMSG_ERROR && (_nlp->nlmsg_flags & NLM_F_ACK) != NLM_F_ACK) { |
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fprintf(stderr, "NLMSG_ERROR\n"); |
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struct nlmsgerr *err = (struct nlmsgerr*)NLMSG_DATA(_nlp); |
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if (err->error != 0) { |
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fprintf(stderr, "rtnetlink error: %s\n", strerror(-(err->error))); |
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} |
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p = _buf; |
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_nll = 0; |
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continue; |
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} |
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if (_nlp->nlmsg_type == NLMSG_NOOP) { |
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fprintf(stderr, "noop\n"); |
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continue; |
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} |
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if( (_nlp->nlmsg_flags & NLM_F_MULTI) == NLM_F_MULTI || (_nlp->nlmsg_type == NLMSG_DONE)) |
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{ |
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if (_nlp->nlmsg_type == NLMSG_DONE) { |
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_processMessage(); |
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p = _buf; |
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_nll = 0; |
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continue; |
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} |
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p += _rtn; |
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_nll += _rtn; |
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} |
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if (_nlp->nlmsg_type == NLMSG_OVERRUN) { |
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fprintf(stderr, "NLMSG_OVERRUN: Data lost\n"); |
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p = _buf; |
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_nll = 0; |
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continue; |
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} |
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_nll += _rtn; |
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_processMessage(); |
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p = _buf; |
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_nll = 0; |
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} |
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else { |
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Thread::sleep(100); |
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continue; |
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} |
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} |
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} |
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void LinuxNetLink::_processMessage() |
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{ |
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for(_nlp = (struct nlmsghdr *)_buf; NLMSG_OK(_nlp, _nll); _nlp=NLMSG_NEXT(_nlp, _nll)) |
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{ |
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switch(_nlp->nlmsg_type)
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{ |
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case RTM_NEWLINK: |
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_linkAdded(); |
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break; |
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case RTM_DELLINK: |
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_linkDeleted(); |
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break; |
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case RTM_GETLINK: |
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fprintf(stderr, "Get Link\n"); |
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break; |
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case RTM_SETLINK: |
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fprintf(stderr, "Set Link\n"); |
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break; |
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case RTM_NEWADDR: |
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_ipAddressAdded(); |
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break; |
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case RTM_DELADDR: |
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_ipAddressDeleted(); |
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break; |
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case RTM_GETADDR: |
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fprintf(stderr, "Get IP Address\n"); |
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break; |
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case RTM_NEWROUTE: |
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_routeAdded(); |
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break; |
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case RTM_DELROUTE: |
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_routeDeleted(); |
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break; |
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case RTM_GETROUTE: |
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break; |
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default: |
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fprintf(stderr, "ignore msgtype %d...\n", _nlp->nlmsg_type); |
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} |
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} |
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_nlp = NULL; |
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_nll = 0; |
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_rtp = NULL; |
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_rtl = 0; |
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_ifip = NULL; |
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_ifil = 0; |
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_ifap = NULL; |
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_ifal = 0; |
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} |
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void LinuxNetLink::_ipAddressAdded() |
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{ |
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_ifap = (struct ifaddrmsg *)NLMSG_DATA(_nlp); |
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_rtap = (struct rtattr *)IFA_RTA(_ifap); |
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_ifal = IFA_PAYLOAD(_nlp); |
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char addr[40] = {0}; |
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char local[40] = {0}; |
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char label[40] = {0}; |
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char bcast[40] = {0}; |
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for(;RTA_OK(_rtap, _ifal); _rtap=RTA_NEXT(_rtap,_ifal)) |
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{ |
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switch(_rtap->rta_type) { |
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case IFA_ADDRESS: |
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inet_ntop(_ifap->ifa_family, RTA_DATA(_rtap), addr, 40); |
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break; |
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case IFA_LOCAL: |
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inet_ntop(_ifap->ifa_family, RTA_DATA(_rtap), local, 40); |
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break; |
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case IFA_LABEL: |
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memcpy(label, RTA_DATA(_rtap), 40); |
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break; |
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case IFA_BROADCAST: |
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inet_ntop(_ifap->ifa_family, RTA_DATA(_rtap), bcast, 40); |
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break; |
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} |
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} |
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fprintf(stderr, "Added IP Address %s local: %s label: %s broadcast: %s\n", addr, local, label, bcast); |
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} |
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void LinuxNetLink::_ipAddressDeleted() |
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{ |
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_ifap = (struct ifaddrmsg *)NLMSG_DATA(_nlp); |
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_rtap = (struct rtattr *)IFA_RTA(_ifap); |
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_ifal = IFA_PAYLOAD(_nlp); |
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char addr[40] = {0}; |
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char local[40] = {0}; |
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char label[40] = {0}; |
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char bcast[40] = {0}; |
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for(;RTA_OK(_rtap, _ifal); _rtap=RTA_NEXT(_rtap,_ifal)) |
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{ |
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switch(_rtap->rta_type) { |
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case IFA_ADDRESS: |
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inet_ntop(_ifap->ifa_family, RTA_DATA(_rtap), addr, 40); |
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break; |
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case IFA_LOCAL: |
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inet_ntop(_ifap->ifa_family, RTA_DATA(_rtap), local, 40); |
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break; |
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case IFA_LABEL: |
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memcpy(label, RTA_DATA(_rtap), 40); |
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break; |
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case IFA_BROADCAST: |
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inet_ntop(_ifap->ifa_family, RTA_DATA(_rtap), bcast, 40); |
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break; |
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} |
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} |
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fprintf(stderr, "Removed IP Address %s local: %s label: %s broadcast: %s\n", addr, local, label, bcast); |
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} |
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void LinuxNetLink::_routeAdded() |
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{ |
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char dsts[40] = {0}; |
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char gws[40] = {0}; |
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char ifs[16] = {0}; |
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char ms[24] = {0}; |
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_rtp = (struct rtmsg *) NLMSG_DATA(_nlp); |
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_rtap = (struct rtattr *)RTM_RTA(_rtp); |
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_rtl = RTM_PAYLOAD(_nlp); |
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for(;RTA_OK(_rtap, _rtl); _rtap=RTA_NEXT(_rtap, _rtl)) |
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{ |
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switch(_rtap->rta_type) |
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{ |
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case RTA_DST: |
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inet_ntop(_rtp->rtm_family, RTA_DATA(_rtap), dsts, _rtp->rtm_family == AF_INET ? 24 : 40); |
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break; |
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case RTA_GATEWAY: |
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inet_ntop(_rtp->rtm_family, RTA_DATA(_rtap), gws, _rtp->rtm_family == AF_INET ? 24 : 40); |
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break; |
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case RTA_OIF: |
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sprintf(ifs, "%d", *((int*)RTA_DATA(_rtap))); |
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break; |
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} |
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} |
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sprintf(ms, "%d", _rtp->rtm_dst_len); |
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fprintf(stderr, "Route Added: dst %s/%s gw %s if %s\n", dsts, ms, gws, ifs); |
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} |
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void LinuxNetLink::_routeDeleted() |
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{ |
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char dsts[40] = {0}; |
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char gws[40] = {0}; |
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char ifs[16] = {0}; |
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char ms[24] = {0}; |
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_rtp = (struct rtmsg *) NLMSG_DATA(_nlp); |
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_rtap = (struct rtattr *)RTM_RTA(_rtp); |
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_rtl = RTM_PAYLOAD(_nlp); |
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for(;RTA_OK(_rtap, _rtl); _rtap=RTA_NEXT(_rtap, _rtl)) |
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{ |
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switch(_rtap->rta_type) |
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{ |
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case RTA_DST: |
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inet_ntop(_rtp->rtm_family, RTA_DATA(_rtap), dsts, _rtp->rtm_family == AF_INET ? 24 : 40); |
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break; |
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case RTA_GATEWAY: |
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inet_ntop(_rtp->rtm_family, RTA_DATA(_rtap), gws, _rtp->rtm_family == AF_INET ? 24 : 40); |
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break; |
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case RTA_OIF: |
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sprintf(ifs, "%d", *((int*)RTA_DATA(_rtap))); |
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break; |
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} |
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} |
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sprintf(ms, "%d", _rtp->rtm_dst_len); |
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fprintf(stderr, "Route Deleted: dst %s/%s gw %s if %s\n", dsts, ms, gws, ifs); |
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} |
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void LinuxNetLink::_linkAdded() |
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{ |
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char mac[20] = {0}; |
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unsigned int mtu = 0; |
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char ifname[40] = {0}; |
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_ifip = (struct ifinfomsg *)NLMSG_DATA(_nlp); |
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_rtap = (struct rtattr *)IFLA_RTA(_ifip); |
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_ifil = RTM_PAYLOAD(_nlp); |
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const char *ptr; |
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unsigned char *ptr2; |
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for(;RTA_OK(_rtap, _ifil);_rtap=RTA_NEXT(_rtap, _ifil)) |
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{ |
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switch(_rtap->rta_type) { |
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case IFLA_ADDRESS: |
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ptr2 = (unsigned char*)RTA_DATA(_rtap); |
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snprintf(mac, 20, "%02x:%02x:%02x:%02x:%02x:%02x", |
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ptr2[0], ptr2[1], ptr2[2], ptr2[3], ptr2[4], ptr2[5]); |
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break; |
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case IFLA_IFNAME: |
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ptr = (const char*)RTA_DATA(_rtap); |
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memcpy(ifname, ptr, strlen(ptr)); |
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break; |
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case IFLA_MTU: |
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memcpy(&mtu, RTA_DATA(_rtap), sizeof(unsigned int)); |
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break; |
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} |
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} |
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fprintf(stderr, "Link Added: %s mac: %s, mtu: %d\n", ifname, mac, mtu); |
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} |
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void LinuxNetLink::_linkDeleted() |
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{ |
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char mac[20] = {0}; |
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unsigned int mtu = 0; |
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char ifname[40] = {0}; |
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_ifip = (struct ifinfomsg *)NLMSG_DATA(_nlp); |
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_rtap = (struct rtattr *)IFLA_RTA(_ifip); |
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_ifil = RTM_PAYLOAD(_nlp); |
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const char *ptr; |
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unsigned char *ptr2; |
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for(;RTA_OK(_rtap, _ifil);_rtap=RTA_NEXT(_rtap, _ifil)) |
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{ |
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switch(_rtap->rta_type) { |
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case IFLA_ADDRESS: |
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ptr2 = (unsigned char*)RTA_DATA(_rtap); |
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snprintf(mac, 20, "%02x:%02x:%02x:%02x:%02x:%02x", |
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ptr2[0], ptr2[1], ptr2[2], ptr2[3], ptr2[4], ptr2[5]); |
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break; |
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case IFLA_IFNAME: |
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ptr = (const char*)RTA_DATA(_rtap); |
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memcpy(ifname, ptr, strlen(ptr)); |
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break; |
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case IFLA_MTU: |
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memcpy(&mtu, RTA_DATA(_rtap), sizeof(unsigned int)); |
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break; |
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} |
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} |
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fprintf(stderr, "Link Deleted: %s mac: %s, mtu: %d\n", ifname, mac, mtu); |
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} |
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void LinuxNetLink::_requestIPv4Routes() |
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{ |
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struct nl_req req; |
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bzero(&req, sizeof(req)); |
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req.nl.nlmsg_len = NLMSG_LENGTH(sizeof(struct rtmsg)); |
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req.nl.nlmsg_flags = NLM_F_REQUEST | NLM_F_DUMP; |
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req.nl.nlmsg_type = RTM_GETROUTE; |
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req.rt.rtm_family = AF_INET; |
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req.rt.rtm_table = RT_TABLE_MAIN; |
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bzero(&_pa, sizeof(_pa)); |
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_pa.nl_family = AF_NETLINK; |
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bzero(&_msg, sizeof(_msg)); |
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_msg.msg_name = (void*)&_pa; |
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_msg.msg_namelen = sizeof(_pa); |
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_iov.iov_base = (void*)&req.nl; |
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_iov.iov_len = req.nl.nlmsg_len; |
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_msg.msg_iov = &_iov; |
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_msg.msg_iovlen = 1; |
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_rtn = sendmsg(_fd, &_msg, 0); |
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} |
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void LinuxNetLink::_requestIPv6Routes() |
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{ |
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struct nl_req req; |
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bzero(&req, sizeof(req)); |
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req.nl.nlmsg_len = NLMSG_LENGTH(sizeof(struct rtmsg)); |
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req.nl.nlmsg_flags = NLM_F_REQUEST | NLM_F_DUMP; |
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req.nl.nlmsg_type = RTM_GETROUTE; |
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req.rt.rtm_family = AF_INET6; |
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req.rt.rtm_table = RT_TABLE_MAIN; |
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bzero(&_pa, sizeof(_pa)); |
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_pa.nl_family = AF_NETLINK; |
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bzero(&_msg, sizeof(_msg)); |
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_msg.msg_name = (void*)&_pa; |
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_msg.msg_namelen = sizeof(_pa); |
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_iov.iov_base = (void*)&req.nl; |
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_iov.iov_len = req.nl.nlmsg_len; |
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_msg.msg_iov = &_iov; |
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_msg.msg_iovlen = 1; |
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while((_rtn = sendmsg(_fd, &_msg, 0)) == -1) { |
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fprintf(stderr, "ipv6 waiting..."); |
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Thread::sleep(100); |
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} |
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} |
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void LinuxNetLink::addRoute(const InetAddress &target, const InetAddress &via, const char *ifaceName) |
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{ |
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} |
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void LinuxNetLink::delRoute(const InetAddress &target, const InetAddress &via, const char *ifaceName) |
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{ |
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} |
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void LinuxNetLink::addInterface(const char *iface) |
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{ |
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} |
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void LinuxNetLink::addAddress(const InetAddress &addr, const char *iface) |
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{ |
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} |
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RouteList LinuxNetLink::getIPV4Routes() const
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{ |
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return _routes_ipv4; |
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} |
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RouteList LinuxNetLink::getIPV6Routes() const |
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{ |
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return _routes_ipv6; |
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} |
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} // namespace ZeroTier
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@ -0,0 +1,133 @@
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/*
|
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* ZeroTier One - Network Virtualization Everywhere |
||||
* Copyright (C) 2011-2018 ZeroTier, Inc. https://www.zerotier.com/
|
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* |
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* 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 |
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* the Free Software Foundation, either version 3 of the License, or |
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* (at your option) any later version. |
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* |
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* This program is distributed in the hope that it will be useful, |
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* but WITHOUT ANY WARRANTY; without even the implied warranty of |
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* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the |
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* GNU General Public License for more details. |
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* |
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* You should have received a copy of the GNU General Public License |
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* along with this program. If not, see <http://www.gnu.org/licenses/>.
|
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* |
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* -- |
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* |
||||
* 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. |
||||
*/ |
||||
|
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#ifndef ZT_LINUX_NETLINK_HPP |
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#define ZT_LINUX_NETLINK_HPP |
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|
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#include <vector> |
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|
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#include <bits/sockaddr.h> |
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#include <asm/types.h> |
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#include <linux/rtnetlink.h> |
||||
#include <sys/socket.h> |
||||
|
||||
|
||||
#include "../node/InetAddress.hpp" |
||||
#include "Thread.hpp" |
||||
|
||||
|
||||
namespace ZeroTier { |
||||
|
||||
struct route_entry { |
||||
InetAddress target; |
||||
InetAddress via; |
||||
const char *iface; |
||||
}; |
||||
|
||||
typedef std::vector<route_entry> RouteList; |
||||
|
||||
struct nl_req { |
||||
struct nlmsghdr nl; |
||||
struct rtmsg rt; |
||||
char buf[8192]; |
||||
}; |
||||
|
||||
/**
|
||||
* Interface with Linux's RTNETLINK
|
||||
*/ |
||||
class LinuxNetLink |
||||
{ |
||||
private: |
||||
LinuxNetLink(); |
||||
~LinuxNetLink(); |
||||
|
||||
public: |
||||
static LinuxNetLink& getInstance() |
||||
{ |
||||
static LinuxNetLink instance; |
||||
return instance; |
||||
} |
||||
|
||||
LinuxNetLink(LinuxNetLink const&) = delete; |
||||
void operator=(LinuxNetLink const&) = delete; |
||||
|
||||
void addRoute(const InetAddress &target, const InetAddress &via, const char *ifaceName); |
||||
void delRoute(const InetAddress &target, const InetAddress &via, const char *ifaceName); |
||||
RouteList getIPV4Routes() const; |
||||
RouteList getIPV6Routes() const; |
||||
|
||||
void addInterface(const char *iface); |
||||
|
||||
void addAddress(const InetAddress &addr, const char *iface); |
||||
|
||||
void threadMain() throw(); |
||||
private: |
||||
void _processMessage(); |
||||
void _routeAdded(); |
||||
void _routeDeleted(); |
||||
void _linkAdded(); |
||||
void _linkDeleted(); |
||||
void _ipAddressAdded(); |
||||
void _ipAddressDeleted(); |
||||
|
||||
|
||||
void _requestIPv4Routes(); |
||||
void _requestIPv6Routes(); |
||||
|
||||
|
||||
Thread _t; |
||||
bool _running; |
||||
RouteList _routes_ipv4; |
||||
RouteList _routes_ipv6; |
||||
|
||||
// socket communication vars;
|
||||
int _fd; |
||||
struct sockaddr_nl _la; |
||||
struct sockaddr_nl _pa; |
||||
struct msghdr _msg; |
||||
struct iovec _iov; |
||||
int _rtn; |
||||
char _buf[8192]; |
||||
|
||||
// RTNETLINK message pointers & lengths
|
||||
// used for processing messages
|
||||
struct nlmsghdr *_nlp; |
||||
int _nll; |
||||
|
||||
struct rtmsg *_rtp; |
||||
int _rtl; |
||||
struct rtattr *_rtap; |
||||
|
||||
struct ifinfomsg *_ifip; |
||||
int _ifil; |
||||
|
||||
struct ifaddrmsg *_ifap; |
||||
int _ifal; |
||||
};
|
||||
|
||||
} |
||||
|
||||
#endif // ZT_LINUX_NETLINK_HPPS
|
||||
Loading…
Reference in new issue