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143 lines
3.2 KiB
143 lines
3.2 KiB
// Copyright © 2020 Marius Petrescu (YO2LOJ). All rights reserved.
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// urfd -- The universal reflector
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// Copyright © 2021 Thomas A. Early N7TAE
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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 <https://www.gnu.org/licenses/>.
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#include "Main.h"
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#include <string.h>
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#include "Reflector.h"
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#include "RawSocket.h"
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////////////////////////////////////////////////////////////////////////////////////////
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// constructor
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CRawSocket::CRawSocket()
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{
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m_Socket = -1;
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}
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////////////////////////////////////////////////////////////////////////////////////////
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// destructor
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CRawSocket::~CRawSocket()
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{
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if ( m_Socket != -1 )
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{
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Close();
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}
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}
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////////////////////////////////////////////////////////////////////////////////////////
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// open & close
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bool CRawSocket::Open(uint16_t uiProto)
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{
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bool open = false;
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int on = 1;
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// create socket
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m_Socket = socket(AF_INET, SOCK_RAW, uiProto);
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if ( m_Socket != -1 )
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{
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fcntl(m_Socket, F_SETFL, O_NONBLOCK);
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open = true;
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m_Proto = uiProto;
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}
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// done
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return open;
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}
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void CRawSocket::Close(void)
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{
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if ( m_Socket != -1 )
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{
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close(m_Socket);
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m_Socket = -1;
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}
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}
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////////////////////////////////////////////////////////////////////////////////////////
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// read
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int CRawSocket::Receive(uint8_t *Buffer, CIp *Ip, int timeout)
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{
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struct sockaddr_in Sin;
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fd_set FdSet;
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unsigned int uiFromLen = sizeof(struct sockaddr_in);
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int iRecvLen = -1;
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struct timeval tv;
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// socket valid ?
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if ( m_Socket != -1 )
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{
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// control socket
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FD_ZERO(&FdSet);
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FD_SET(m_Socket, &FdSet);
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tv.tv_sec = timeout / 1000;
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tv.tv_usec = (timeout % 1000) * 1000;
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select(m_Socket + 1, &FdSet, 0, 0, &tv);
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// read
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iRecvLen = (int)recvfrom(m_Socket, Buffer, RAW_BUFFER_LENMAX, 0, (struct sockaddr *)&Sin, &uiFromLen);
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// handle
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if ( iRecvLen != -1 )
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{
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// get IP
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memcpy(Ip->GetPointer(), &Sin, sizeof(struct sockaddr_in));
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}
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}
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// done
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return iRecvLen;
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}
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// protocol specific
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// ICMP
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int CRawSocket::IcmpReceive(uint8_t *Buffer, CIp *Ip, int timeout)
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{
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int iIcmpType = -1;
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int iRecv;
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if (m_Proto == IPPROTO_ICMP)
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{
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iRecv = Receive(Buffer, Ip, timeout);
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if (iRecv >= (int)(sizeof(struct ip) + sizeof(struct icmp)))
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{
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struct ip *iph = (struct ip *)Buffer;
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int iphdrlen = iph->ip_hl * 4;
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struct icmp *icmph = (struct icmp *)((unsigned char *)iph + iphdrlen);
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struct ip *remote_iph = (struct ip *)((unsigned char *)icmph + 8);
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iIcmpType = icmph->icmp_type;
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struct sockaddr_in Sin;
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bzero(&Sin, sizeof(Sin));
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Sin.sin_family = AF_INET;
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Sin.sin_addr.s_addr = remote_iph->ip_dst.s_addr;
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memcpy(Ip->GetPointer(), &Sin, sizeof(struct sockaddr_in));
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}
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}
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return iIcmpType;
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}
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