/*************************************************************************** * ICMPv4Header.cc -- The ICMPv4Header Class represents an ICMP version 4 * * packet. It contains methods to set any header field. In general, these * * methods do error checkings and byte order conversion. * * * ***********************IMPORTANT NMAP LICENSE TERMS************************ * * * The Nmap Security Scanner is (C) 1996-2011 Insecure.Com LLC. Nmap is * * also a registered trademark of Insecure.Com LLC. This program is free * * software; you may redistribute and/or modify it under the terms of the * * GNU General Public License as published by the Free Software * * Foundation; Version 2 with the clarifications and exceptions described * * below. This guarantees your right to use, modify, and redistribute * * this software under certain conditions. If you wish to embed Nmap * * technology into proprietary software, we sell alternative licenses * * (contact sales@insecure.com). Dozens of software vendors already * * license Nmap technology such as host discovery, port scanning, OS * * detection, and version detection. * * * * Note that the GPL places important restrictions on "derived works", yet * * it does not provide a detailed definition of that term. 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See the GNU * * General Public License v2.0 for more details at * * http://www.gnu.org/licenses/gpl-2.0.html , or in the COPYING file * * included with Nmap. * * * ***************************************************************************/ #ifndef ICMPv4HEADER_H #define ICMPv4HEADER_H 1 #include "NetworkLayerElement.h" /* ICMP types and codes. These defines were originally taken from Slirp 1.0 * source file ip_icmp.h http://slirp.sourceforge.net/ (BSD licensed) and * then, partially modified for Nping */ #define ICMP_ECHOREPLY 0 /* Echo reply */ #define ICMP_UNREACH 3 /* Destination unreachable: */ #define ICMP_UNREACH_NET 0 /* --> Bad network */ #define ICMP_UNREACH_HOST 1 /* --> Bad host */ #define ICMP_UNREACH_PROTOCOL 2 /* --> Bad protocol */ #define ICMP_UNREACH_PORT 3 /* --> Bad port */ #define ICMP_UNREACH_NEEDFRAG 4 /* --> DF flag caused pkt drop */ #define ICMP_UNREACH_SRCFAIL 5 /* --> Source route failed */ #define ICMP_UNREACH_NET_UNKNOWN 6 /* --> Unknown network */ #define ICMP_UNREACH_HOST_UNKNOWN 7 /* --> Unknown host */ #define ICMP_UNREACH_ISOLATED 8 /* --> Source host isolated */ #define ICMP_UNREACH_NET_PROHIB 9 /* --> Prohibited access */ #define ICMP_UNREACH_HOST_PROHIB 10 /* --> Prohibited access */ #define ICMP_UNREACH_TOSNET 11 /* --> Bad TOS for network */ #define ICMP_UNREACH_TOSHOST 12 /* --> Bad TOS for host */ #define ICMP_UNREACH_COMM_PROHIB 13 /* --> Prohibited communication */ #define ICMP_UNREACH_HOSTPRECEDENCE 14 /* --> Host precedence violation */ #define ICMP_UNREACH_PRECCUTOFF 15 /* --> Precedence cutoff */ #define ICMP_SOURCEQUENCH 4 /* Source Quench. */ #define ICMP_REDIRECT 5 /* Redirect: */ #define ICMP_REDIRECT_NET 0 /* --> For the network */ #define ICMP_REDIRECT_HOST 1 /* --> For the host */ #define ICMP_REDIRECT_TOSNET 2 /* --> For the TOS and network */ #define ICMP_REDIRECT_TOSHOST 3 /* --> For the TOS and host */ #define ICMP_ECHO 8 /* Echo request */ #define ICMP_ROUTERADVERT 9 /* Router advertisement */ #define ICMP_ROUTERADVERT_MOBILE 16 /* Used by mobile IP agents */ #define ICMP_ROUTERSOLICIT 10 /* Router solicitation */ #define ICMP_TIMXCEED 11 /* Time exceeded: */ #define ICMP_TIMXCEED_INTRANS 0 /* --> TTL==0 in transit */ #define ICMP_TIMXCEED_REASS 1 /* --> TTL==0 in reassembly */ #define ICMP_PARAMPROB 12 /* Parameter problem */ #define ICMM_PARAMPROB_POINTER 0 /* --> Pointer shows the problem */ #define ICMP_PARAMPROB_OPTABSENT 1 /* --> Option missing */ #define ICMP_PARAMPROB_BADLEN 2 /* --> Bad datagram length */ #define ICMP_TSTAMP 13 /* Timestamp request */ #define ICMP_TSTAMPREPLY 14 /* Timestamp reply */ #define ICMP_INFO 15 /* Information request */ #define ICMP_INFOREPLY 16 /* Information reply */ #define ICMP_MASK 17 /* Address mask request */ #define ICMP_MASKREPLY 18 /* Address mask reply */ #define ICMP_TRACEROUTE 30 /* Traceroute */ #define ICMP_TRACEROUTE_SUCCESS 0 /* --> Dgram sent to next router */ #define ICMP_TRACEROUTE_DROPPED 1 /* --> Dgram was dropped */ #define ICMP_STD_HEADER_LEN 8 #define ICMP_PAYLOAD_LEN 1500 class ICMPv4Header : public NetworkLayerElement { private: struct nping_icmpv4_hdr { u8 type; /* ICMP Message Type */ u8 code; /* ICMP Message Code */ u16 checksum; /* Checksum */ union{ u32 unused; /* Dest unreach/Source quench/Time exceeded */ u32 addr; /* Redirect */ u8 pointer8_unused24[4]; /* Parameter problem */ u8 num8_size8_time16[4]; /* Router advertisement */ u16 id_seq[2]; /* Echo/Timestamp/Mask */ u16 id_unused[2]; /* Traceroute */ u32 f32; /* Generic name. One 32 bit word */ u16 f16[2]; /* Generic name. Two 16 bit words */ u8 f8[4]; /* Generic name. Four 8 bit workds */ }h3; u8 data[ICMP_PAYLOAD_LEN]; /* Note -- first 4-12 bytes can be used for ICMP header */ }__attribute__((__packed__)); typedef struct nping_icmpv4_hdr nping_icmpv4_hdr_t; nping_icmpv4_hdr_t h; int routeradventries; /* Internal count for Router Adverstisement entries */ public: /* Misc */ ICMPv4Header(); ~ICMPv4Header(); void reset(); void zero(); u8 *getBufferPointer(); int storeRecvData(const u8 *buf, size_t len); /* ICMP Type */ int setType(u8 val); u8 getType(); bool validateType(); bool validateType(u8 val); /* Code */ int setCode(u8 c); u8 getCode(); bool validateCode(); bool validateCode(u8 type, u8 code); /* Checksum */ int setSum(); int setSum(u16 s); int setSumRandom(); u16 getSum(); /* Dest unreach/Source quench/Time exceeded */ int setUnused(u32 val); u32 getUnused(); /* Redirect */ int setPreferredRouter(struct in_addr ipaddr); u32 getPreferredRouter(); /* Parameter problem */ int setPointer(u8 val); u8 getPointer(); /* Router Solicitation */ int setReserved( u32 val ); u32 getReserved(); /* Router advertisement */ int setNumAddresses(u8 val); u8 getNumAddresses(); int setAddrEntrySize(u8 val); u8 getAddrEntrySize(); int setLifetime(u16 val); u16 getLifetime(); int addRouterAdvEntry(struct in_addr raddr, u32 pref); u8 *getRouterAdvEntries(int *num); int clearRouterAdvEntries(); /* Echo/Timestamp/Mask */ int setIdentifier(u16 val); u16 getIdentifier(); int setSequence(u16 val); u16 getSequence(); /* Timestamp only */ int setOriginateTimestamp(u32 t); u32 getOriginateTimestamp(); int setReceiveTimestamp(u32 t); u32 getReceiveTimestamp(); int setTransmitTimestamp(u32 t); u32 getTransmitTimestamp(); /* Traceroute */ int setIDNumber(u16 val); u16 getIDNumber(); /* Payload */ int addPayload(const u8 *src, int len); int addPayload(const char *src); /* Misc */ int getICMPHeaderLengthFromType( u8 type ); }; /* End of class ICMPv4Header */ #endif