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114 lines
3.0 KiB
C++
114 lines
3.0 KiB
C++
/*
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* Hans - IP over ICMP
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* Copyright (C) 2009 Friedrich Schöller <hans@schoeller.se>
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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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#include "tun.h"
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#include "exception.h"
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#include "utility.h"
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#include <arpa/inet.h>
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#include <netinet/in_systm.h>
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#include <netinet/in.h>
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#include <netinet/ip.h>
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#include <syslog.h>
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#include <stdlib.h>
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#include <string.h>
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#include <errno.h>
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#include <stdio.h>
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typedef ip IpHeader;
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using namespace std;
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Tun::Tun(const char *device, int mtu)
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{
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this->mtu = mtu;
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if (device != NULL)
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{
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strncpy(this->device, device, VTUN_DEV_LEN);
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this->device[VTUN_DEV_LEN] = 0;
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}
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else
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this->device[0] = 0;
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fd = tun_open(this->device);
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if (fd == -1)
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throw Exception("could not create tunnel device");
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char cmdline[512];
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snprintf(cmdline, sizeof(cmdline), "/sbin/ifconfig %s mtu %u", this->device, mtu);
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if (system(cmdline) != 0)
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syslog(LOG_ERR, "could not set tun device mtu");
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}
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Tun::~Tun()
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{
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tun_close(fd, device);
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}
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void Tun::setIp(uint32_t ip, uint32_t destIp, bool includeSubnet)
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{
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char cmdline[512];
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string ips = Utility::formatIp(ip);
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string destIps = Utility::formatIp(destIp);
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#ifdef LINUX
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snprintf(cmdline, sizeof(cmdline), "/sbin/ifconfig %s %s netmask 255.255.255.0", device, ips.c_str());
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#else
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snprintf(cmdline, sizeof(cmdline), "/sbin/ifconfig %s %s %s netmask 255.255.255.255", device, ips.c_str(), destIps.c_str());
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#endif
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if (system(cmdline) != 0)
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syslog(LOG_ERR, "could not set tun device ip address");
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#ifndef LINUX
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if (includeSubnet)
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{
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snprintf(cmdline, sizeof(cmdline), "/sbin/route add %s/24 %s", destIps.c_str(), destIps.c_str());
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if (system(cmdline) != 0)
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syslog(LOG_ERR, "could not add route");
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}
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#endif
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}
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void Tun::write(const char *buffer, int length)
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{
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if (tun_write(fd, (char *)buffer, length) == -1)
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syslog(LOG_ERR, "error writing %d bytes to tun: %s", length, strerror(errno));
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}
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int Tun::read(char *buffer)
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{
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int length = tun_read(fd, buffer, mtu);
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if (length == -1)
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syslog(LOG_ERR, "error reading from tun: %s", strerror(errno));
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return length;
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}
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int Tun::read(char *buffer, uint32_t &sourceIp, uint32_t &destIp)
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{
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int length = read(buffer);
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IpHeader *header = (IpHeader *)buffer;
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sourceIp = ntohl(header->ip_src.s_addr);
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destIp = ntohl(header->ip_dst.s_addr);
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return length;
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}
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