Linux routing table support work.

node/osdep/LinuxRoutingTable.cpp

@@ -0,0 +1,247 @@
+/*
+ * ZeroTier One - Global Peer to Peer Ethernet
+ * Copyright (C) 2011-2014  ZeroTier Networks LLC
+ *
+ * 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/socket.h>
+#include <sys/types.h>
+#include <sys/stat.h>
+#include <fcntl.h>
+#include <netinet/in.h>
+#include <arpa/inet.h>
+#include <ifaddrs.h>
+
+#include <algorithm>
+#include <utility>
+
+#include "../Constants.hpp"
+#include "../Utils.hpp"
+#include "LinuxRoutingTable.hpp"
+
+#define ZT_LINUX_IP_COMMAND "/sbin/ip"
+
+namespace ZeroTier {
+
+LinuxRoutingTable::LinuxRoutingTable()
+{
+}
+
+LinuxRoutingTable::~LinuxRoutingTable()
+{
+}
+
+std::vector<RoutingTable::Entry> LinuxRoutingTable::get(bool includeLinkLocal,bool includeLoopback) const
+{
+	char buf[131072];
+	char *stmp,*stmp2;
+	std::vector<RoutingTable::Entry> entries;
+
+	{
+                int fd = ::open("/proc/net/route",O_RDONLY);
+		if (fd <= 0)
+			buf[0] = (char)0;
+		else {
+			int n = (int)::read(fd,buf,sizeof(buf) - 1);
+			::close(fd);
+			if (n < 0) n = 0;
+			buf[n] = (char)0;
+		}
+	}
+
+	int lineno = 0;
+	for(char *line=Utils::stok(buf,"\r\n",&stmp);(line);line=Utils::stok((char *)0,"\r\n",&stmp)) {
+		if (lineno == 0) {
+			++lineno;
+			continue; // skip header
+		}
+
+		char *iface = (char *)0;
+		uint32_t destination = 0;
+		uint32_t gateway = 0;
+		int metric = 0;
+		uint32_t mask = 0;
+
+		int fno = 0;
+		for(char *f=Utils::stok(line,"\t \r\n",&stmp2);(f);f=Utils::stok((char *)0,"\t \r\n",&stmp2)) {
+			switch(fno) {
+				case 0: iface = f; break;
+				case 1: destination = (uint32_t)Utils::hexStrToULong(f); break;
+				case 2: gateway = (uint32_t)Utils::hexStrToULong(f); break;
+				case 6: metric = (int)Utils::strToInt(f); break;
+				case 7: mask = (uint32_t)Utils::hexStrToULong(f); break;
+			}
+			++fno;
+		}
+
+		if ((iface)&&(destination)) {
+			RoutingTable::Entry e;
+			if (destination)
+				e.destination.set(&destination,4,Utils::countBits(mask));
+			e.gateway.set(&gateway,4,0);
+			e.deviceIndex = 0; // not used on Linux
+			e.metric = metric;
+			Utils::scopy(e.device,sizeof(e.device),iface);
+			if ((e.destination)&&((includeLinkLocal)||(!e.destination.isLinkLocal()))&&((includeLoopback)||((!e.destination.isLoopback())&&(!e.gateway.isLoopback())&&(strcmp(iface,"lo")))))
+				entries.push_back(e);
+		}
+
+		++lineno;
+	}
+
+	{
+		int fd = ::open("/proc/net/ipv6_route",O_RDONLY);
+		if (fd <= 0)
+			buf[0] = (char)0;
+		else {
+			int n = (int)::read(fd,buf,sizeof(buf) - 1);
+			::close(fd);
+			if (n < 0) n = 0;
+			buf[n] = (char)0;
+		}
+	}
+
+	for(char *line=Utils::stok(buf,"\r\n",&stmp);(line);line=Utils::stok((char *)0,"\r\n",&stmp)) {
+		char *destination = (char *)0;
+		unsigned int destPrefixLen = 0;
+		char *gateway = (char *)0; // next hop in ipv6 terminology
+		int metric = 0;
+		char *device = (char *)0;
+
+		int fno = 0;
+		for(char *f=Utils::stok(line,"\t \r\n",&stmp2);(f);f=Utils::stok((char *)0,"\t \r\n",&stmp2)) {
+			switch(fno) {
+				case 0: destination = f; break;
+				case 1: destPrefixLen = (unsigned int)Utils::hexStrToULong(f); break;
+				case 4: gateway = f; break;
+				case 5: metric = (int)Utils::hexStrToLong(f); break;
+				case 9: device = f; break;
+			}
+			++fno;
+		}
+
+		if ((device)&&(destination)) {
+			unsigned char tmp[16];
+			RoutingTable::Entry e;
+			Utils::unhex(destination,tmp,16);
+			if ((!Utils::isZero(tmp,16))&&(tmp[0] != 0xff))
+				e.destination.set(tmp,16,destPrefixLen);
+			Utils::unhex(gateway,tmp,16);
+			e.gateway.set(tmp,16,0);
+			e.deviceIndex = 0; // not used on Linux
+			e.metric = metric;
+			Utils::scopy(e.device,sizeof(e.device),device);
+			if ((e.destination)&&((includeLinkLocal)||(!e.destination.isLinkLocal()))&&((includeLoopback)||((!e.destination.isLoopback())&&(!e.gateway.isLoopback())&&(strcmp(device,"lo")))))
+				entries.push_back(e);
+		}
+	}
+
+	std::sort(entries.begin(),entries.end());
+	return entries;
+}
+
+RoutingTable::Entry LinuxRoutingTable::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))) {
+			}
+		}
+	}
+
+	if (metric < 0)
+		return RoutingTable::Entry();
+
+
+
+	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)
+{
+	LinuxRoutingTable 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

node/osdep/LinuxRoutingTable.hpp

@@ -0,0 +1,49 @@
+/*
+ * ZeroTier One - Global Peer to Peer Ethernet
+ * Copyright (C) 2011-2014  ZeroTier Networks LLC
+ *
+ * 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/
+ */
+
+#ifndef ZT_LINUXROUTINGTABLE_HPP
+#define ZT_LINUXROUTINGTABLE_HPP
+
+#include "../RoutingTable.hpp"
+
+namespace ZeroTier {
+
+/**
+ * Routing table interface via /proc/net/route, /proc/net/ipv6_route, and /sbin/route command
+ */
+class LinuxRoutingTable : public RoutingTable
+{
+public:
+	LinuxRoutingTable();
+	virtual ~LinuxRoutingTable();
+	virtual std::vector<RoutingTable::Entry> get(bool includeLinkLocal = false,bool includeLoopback = false) const;
+	virtual RoutingTable::Entry set(const InetAddress &destination,const InetAddress &gateway,const char *device,int metric);
+};
+
+} // namespace ZeroTier
+
+#endif