ICMP programming example

00001 
00006 /*
00007 Copyright (C) 2004  Anders Hedstrom
00008 Parts Copyright (c) Vergil of Ragestorm.net, 2003
00009 
00010 This program is free software; you can redistribute it and/or
00011 modify it under the terms of the GNU General Public License
00012 as published by the Free Software Foundation; either version 2
00013 of the License, or (at your option) any later version.
00014 
00015 This program is distributed in the hope that it will be useful,
00016 but WITHOUT ANY WARRANTY; without even the implied warranty of
00017 MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
00018 GNU General Public License for more details.
00019 
00020 You should have received a copy of the GNU General Public License
00021 along with this program; if not, write to the Free Software
00022 Foundation, Inc., 59 Temple Place - Suite 330, Boston, MA  02111-1307, USA.
00023 */
00024 #ifndef _ICMPTWISTSOCKET_H
00025 #define _ICMPTWISTSOCKET_H
00026 
00027 #include "Socket.h"
00028 
00029 
00030 /* ICMP_TWIST.C: A program intended to demonstrate the usage
00031  * of ICMP Information Request (Type 15) messages.
00032  * What this program does and does not do:
00033  * It DOES implement an ICMP chat using raw sockets and Type 15 messages.
00034  * It DOES manipulate UNIX file system descriptors in creative ways.
00035  * It uses poll() (but not select()), a good call if we want to multiplex
00036  * input and output
00037  * It does NOT use the kernel headers for defining ICMP structs etc.
00038  * (see <linux/icmp.h>
00039  * It does NOT compile under Windows, although changes to allow that
00040  * would be minor.
00041 */
00042 
00043 // ICMP codes
00044 #define ICMP_INFO_REQUEST 15
00045 #define ICMP_INFO_REPLY 16
00046 
00047 /* Should be between 530 and 1450 (MTU always >= 576, and in most
00048  * cases < 1500); 14 bytes go for the Ethernet header, 20 for the IP header
00049  * and 8 for the ICMP header. Fragmentation is not [yet] implemented
00050 */
00051 #define INP_BUFFER 256
00052 
00053 struct icmp_info // reply and request
00054 {
00055         uint8_t type;
00056         uint8_t code;
00057         uint16_t checksum;
00058         uint16_t id;
00059         uint16_t seq_no;
00060         char buffer[INP_BUFFER];
00061 };
00062 
00063 
00064 class ICMPTwistSocket : public Socket
00065 {
00066 public:
00067         ICMPTwistSocket(ISocketHandler& );
00068         ~ICMPTwistSocket();
00069 
00070         void OnRead();
00071 
00072         void Connect(const std::string& );
00073         void Send(const std::string& );
00074 
00075         void OnOptions(int,int,int,SOCKET) {}
00076 
00077 private:
00078         uint16_t calc_crc(uint8_t * packet, size_t len);
00079         struct icmp_info m_info;
00080         uint16_t m_seq_no;
00081 };
00082 
00083 
00084 #endif // _ICMPTWISTSOCKET_H
ICMPTwistSocket.h
