mirror of
https://github.com/zerotier/ZeroTierOne.git
synced 2024-12-30 09:48:54 +00:00
332 lines
9.9 KiB
C++
332 lines
9.9 KiB
C++
/*
|
|
* ZeroTier One - Network Virtualization Everywhere
|
|
* Copyright (C) 2011-2015 ZeroTier, Inc.
|
|
*
|
|
* 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/>.
|
|
*
|
|
* --
|
|
*
|
|
* ZeroTier may be used and distributed under the terms of the GPLv3, which
|
|
* are available at: http://www.gnu.org/licenses/gpl-3.0.html
|
|
*
|
|
* If you would like to embed ZeroTier into a commercial application or
|
|
* redistribute it in a modified binary form, please contact ZeroTier Networks
|
|
* LLC. Start here: http://www.zerotier.com/
|
|
*/
|
|
|
|
#include <stdint.h>
|
|
#include <stdio.h>
|
|
#include <stdlib.h>
|
|
#include <string.h>
|
|
#include <unistd.h>
|
|
#include <sys/param.h>
|
|
#include <sys/sysctl.h>
|
|
#include <sys/socket.h>
|
|
#include <sys/types.h>
|
|
#include <sys/wait.h>
|
|
#include <netinet/in.h>
|
|
#include <arpa/inet.h>
|
|
#include <net/route.h>
|
|
#include <net/if.h>
|
|
#include <net/if_dl.h>
|
|
#include <ifaddrs.h>
|
|
|
|
#include <algorithm>
|
|
#include <utility>
|
|
|
|
#include "../node/Constants.hpp"
|
|
#include "BSDRoutingTable.hpp"
|
|
|
|
// All I wanted was the bloody rounting table. I didn't expect the Spanish inquisition.
|
|
|
|
#define ZT_BSD_ROUTE_CMD "/sbin/route"
|
|
|
|
namespace ZeroTier {
|
|
|
|
BSDRoutingTable::BSDRoutingTable()
|
|
{
|
|
}
|
|
|
|
BSDRoutingTable::~BSDRoutingTable()
|
|
{
|
|
}
|
|
|
|
std::vector<RoutingTable::Entry> BSDRoutingTable::get(bool includeLinkLocal,bool includeLoopback) const
|
|
{
|
|
std::vector<RoutingTable::Entry> entries;
|
|
int mib[6];
|
|
size_t needed;
|
|
|
|
mib[0] = CTL_NET;
|
|
mib[1] = PF_ROUTE;
|
|
mib[2] = 0;
|
|
mib[3] = 0;
|
|
mib[4] = NET_RT_DUMP;
|
|
mib[5] = 0;
|
|
if (!sysctl(mib,6,NULL,&needed,NULL,0)) {
|
|
if (needed <= 0)
|
|
return entries;
|
|
|
|
char *buf = (char *)::malloc(needed);
|
|
if (buf) {
|
|
if (!sysctl(mib,6,buf,&needed,NULL,0)) {
|
|
struct rt_msghdr *rtm;
|
|
for(char *next=buf,*end=buf+needed;next<end;) {
|
|
rtm = (struct rt_msghdr *)next;
|
|
char *saptr = (char *)(rtm + 1);
|
|
char *saend = next + rtm->rtm_msglen;
|
|
|
|
if (((rtm->rtm_flags & RTF_LLINFO) == 0)&&((rtm->rtm_flags & RTF_HOST) == 0)&&((rtm->rtm_flags & RTF_UP) != 0)&&((rtm->rtm_flags & RTF_MULTICAST) == 0)) {
|
|
RoutingTable::Entry e;
|
|
e.deviceIndex = -9999; // unset
|
|
|
|
int which = 0;
|
|
while (saptr < saend) {
|
|
struct sockaddr *sa = (struct sockaddr *)saptr;
|
|
unsigned int salen = sa->sa_len;
|
|
if (!salen)
|
|
break;
|
|
|
|
// Skip missing fields in rtm_addrs bit field
|
|
while ((rtm->rtm_addrs & 1) == 0) {
|
|
rtm->rtm_addrs >>= 1;
|
|
++which;
|
|
if (which > 6)
|
|
break;
|
|
}
|
|
if (which > 6)
|
|
break;
|
|
|
|
rtm->rtm_addrs >>= 1;
|
|
switch(which++) {
|
|
case 0:
|
|
//printf("RTA_DST\n");
|
|
if (sa->sa_family == AF_INET6) {
|
|
struct sockaddr_in6 *sin6 = (struct sockaddr_in6 *)sa;
|
|
// Nobody expects the Spanish inquisition!
|
|
if ((sin6->sin6_addr.s6_addr[0] == 0xfe)&&((sin6->sin6_addr.s6_addr[1] & 0xc0) == 0x80)) {
|
|
// Our chief weapon is... in-band signaling!
|
|
// Seriously who in the living fuck thought this was a good idea and
|
|
// then had the sadistic idea to not document it anywhere? Of course it's
|
|
// not like there is any documentation on BSD sysctls anyway.
|
|
unsigned int interfaceIndex = ((((unsigned int)sin6->sin6_addr.s6_addr[2]) << 8) & 0xff) | (((unsigned int)sin6->sin6_addr.s6_addr[3]) & 0xff);
|
|
sin6->sin6_addr.s6_addr[2] = 0;
|
|
sin6->sin6_addr.s6_addr[3] = 0;
|
|
if (!sin6->sin6_scope_id)
|
|
sin6->sin6_scope_id = interfaceIndex;
|
|
}
|
|
}
|
|
e.destination.set(sa);
|
|
break;
|
|
case 1:
|
|
//printf("RTA_GATEWAY\n");
|
|
switch(sa->sa_family) {
|
|
case AF_LINK:
|
|
e.deviceIndex = (int)((const struct sockaddr_dl *)sa)->sdl_index;
|
|
break;
|
|
case AF_INET:
|
|
case AF_INET6:
|
|
e.gateway.set(sa);
|
|
break;
|
|
}
|
|
break;
|
|
case 2: {
|
|
if (e.destination.isV6()) {
|
|
salen = sizeof(struct sockaddr_in6); // Confess!
|
|
unsigned int bits = 0;
|
|
for(int i=0;i<16;++i) {
|
|
unsigned char c = (unsigned char)((const struct sockaddr_in6 *)sa)->sin6_addr.s6_addr[i];
|
|
if (c == 0xff)
|
|
bits += 8;
|
|
else break;
|
|
/* must they be multiples of 8? Most of the BSD source I can find says yes..?
|
|
else {
|
|
while ((c & 0x80) == 0x80) {
|
|
++bits;
|
|
c <<= 1;
|
|
}
|
|
break;
|
|
}
|
|
*/
|
|
}
|
|
e.destination.setPort(bits);
|
|
} else {
|
|
salen = sizeof(struct sockaddr_in); // Confess!
|
|
e.destination.setPort((unsigned int)Utils::countBits((uint32_t)((const struct sockaddr_in *)sa)->sin_addr.s_addr));
|
|
}
|
|
//printf("RTA_NETMASK\n");
|
|
} break;
|
|
/*
|
|
case 3:
|
|
//printf("RTA_GENMASK\n");
|
|
break;
|
|
case 4:
|
|
//printf("RTA_IFP\n");
|
|
break;
|
|
case 5:
|
|
//printf("RTA_IFA\n");
|
|
break;
|
|
case 6:
|
|
//printf("RTA_AUTHOR\n");
|
|
break;
|
|
*/
|
|
}
|
|
|
|
saptr += salen;
|
|
}
|
|
|
|
e.metric = (int)rtm->rtm_rmx.rmx_hopcount;
|
|
if (e.metric < 0)
|
|
e.metric = 0;
|
|
|
|
if (((includeLinkLocal)||(!e.destination.isLinkLocal()))&&((includeLoopback)||((!e.destination.isLoopback())&&(!e.gateway.isLoopback()))))
|
|
entries.push_back(e);
|
|
}
|
|
|
|
next = saend;
|
|
}
|
|
}
|
|
|
|
::free(buf);
|
|
}
|
|
}
|
|
|
|
for(std::vector<ZeroTier::RoutingTable::Entry>::iterator e1(entries.begin());e1!=entries.end();++e1) {
|
|
if ((!e1->device[0])&&(e1->deviceIndex >= 0))
|
|
if_indextoname(e1->deviceIndex,e1->device);
|
|
}
|
|
for(std::vector<ZeroTier::RoutingTable::Entry>::iterator e1(entries.begin());e1!=entries.end();++e1) {
|
|
if ((!e1->device[0])&&(e1->gateway)) {
|
|
int bestMetric = 9999999;
|
|
for(std::vector<ZeroTier::RoutingTable::Entry>::iterator e2(entries.begin());e2!=entries.end();++e2) {
|
|
if ((e1->gateway.within(e2->destination))&&(e2->metric <= bestMetric)) {
|
|
bestMetric = e2->metric;
|
|
Utils::scopy(e1->device,sizeof(e1->device),e2->device);
|
|
}
|
|
}
|
|
}
|
|
}
|
|
|
|
std::sort(entries.begin(),entries.end());
|
|
|
|
return entries;
|
|
}
|
|
|
|
RoutingTable::Entry BSDRoutingTable::set(const InetAddress &destination,const InetAddress &gateway,const char *device,int metric)
|
|
{
|
|
if ((!gateway)&&((!device)||(!device[0])))
|
|
return RoutingTable::Entry();
|
|
|
|
std::vector<RoutingTable::Entry> rtab(get(true,true));
|
|
|
|
for(std::vector<RoutingTable::Entry>::iterator e(rtab.begin());e!=rtab.end();++e) {
|
|
if (e->destination == destination) {
|
|
if (((!device)||(!device[0]))||(!strcmp(device,e->device))) {
|
|
long p = (long)fork();
|
|
if (p > 0) {
|
|
int exitcode = -1;
|
|
::waitpid(p,&exitcode,0);
|
|
} else if (p == 0) {
|
|
::close(STDOUT_FILENO);
|
|
::close(STDERR_FILENO);
|
|
::execl(ZT_BSD_ROUTE_CMD,ZT_BSD_ROUTE_CMD,"delete",(destination.isV6() ? "-inet6" : "-inet"),destination.toString().c_str(),(const char *)0);
|
|
::_exit(-1);
|
|
}
|
|
}
|
|
}
|
|
}
|
|
|
|
if (metric < 0)
|
|
return RoutingTable::Entry();
|
|
|
|
{
|
|
char hcstr[64];
|
|
Utils::snprintf(hcstr,sizeof(hcstr),"%d",metric);
|
|
long p = (long)fork();
|
|
if (p > 0) {
|
|
int exitcode = -1;
|
|
::waitpid(p,&exitcode,0);
|
|
} else if (p == 0) {
|
|
::close(STDOUT_FILENO);
|
|
::close(STDERR_FILENO);
|
|
if (gateway) {
|
|
::execl(ZT_BSD_ROUTE_CMD,ZT_BSD_ROUTE_CMD,"add",(destination.isV6() ? "-inet6" : "-inet"),destination.toString().c_str(),gateway.toIpString().c_str(),"-hopcount",hcstr,(const char *)0);
|
|
} else if ((device)&&(device[0])) {
|
|
::execl(ZT_BSD_ROUTE_CMD,ZT_BSD_ROUTE_CMD,"add",(destination.isV6() ? "-inet6" : "-inet"),destination.toString().c_str(),"-interface",device,"-hopcount",hcstr,(const char *)0);
|
|
}
|
|
::_exit(-1);
|
|
}
|
|
}
|
|
|
|
rtab = get(true,true);
|
|
std::vector<RoutingTable::Entry>::iterator bestEntry(rtab.end());
|
|
for(std::vector<RoutingTable::Entry>::iterator e(rtab.begin());e!=rtab.end();++e) {
|
|
if ((e->destination == destination)&&(e->gateway.ipsEqual(gateway))) {
|
|
if ((device)&&(device[0])) {
|
|
if (!strcmp(device,e->device)) {
|
|
if (metric == e->metric)
|
|
bestEntry = e;
|
|
}
|
|
}
|
|
if (bestEntry == rtab.end())
|
|
bestEntry = e;
|
|
}
|
|
}
|
|
if (bestEntry != rtab.end())
|
|
return *bestEntry;
|
|
|
|
return RoutingTable::Entry();
|
|
}
|
|
|
|
} // namespace ZeroTier
|
|
|
|
// Enable and build to test routing table interface
|
|
#if 0
|
|
using namespace ZeroTier;
|
|
int main(int argc,char **argv)
|
|
{
|
|
BSDRoutingTable rt;
|
|
|
|
printf("<destination> <gateway> <interface> <metric>\n");
|
|
std::vector<RoutingTable::Entry> ents(rt.get());
|
|
for(std::vector<RoutingTable::Entry>::iterator e(ents.begin());e!=ents.end();++e)
|
|
printf("%s\n",e->toString().c_str());
|
|
printf("\n");
|
|
|
|
printf("adding 1.1.1.0 and 2.2.2.0...\n");
|
|
rt.set(InetAddress("1.1.1.0",24),InetAddress("1.2.3.4",0),(const char *)0,1);
|
|
rt.set(InetAddress("2.2.2.0",24),InetAddress(),"en0",1);
|
|
printf("\n");
|
|
|
|
printf("<destination> <gateway> <interface> <metric>\n");
|
|
ents = rt.get();
|
|
for(std::vector<RoutingTable::Entry>::iterator e(ents.begin());e!=ents.end();++e)
|
|
printf("%s\n",e->toString().c_str());
|
|
printf("\n");
|
|
|
|
printf("deleting 1.1.1.0 and 2.2.2.0...\n");
|
|
rt.set(InetAddress("1.1.1.0",24),InetAddress("1.2.3.4",0),(const char *)0,-1);
|
|
rt.set(InetAddress("2.2.2.0",24),InetAddress(),"en0",-1);
|
|
printf("\n");
|
|
|
|
printf("<destination> <gateway> <interface> <metric>\n");
|
|
ents = rt.get();
|
|
for(std::vector<RoutingTable::Entry>::iterator e(ents.begin());e!=ents.end();++e)
|
|
printf("%s\n",e->toString().c_str());
|
|
printf("\n");
|
|
|
|
return 0;
|
|
}
|
|
#endif
|