451 lines
13 KiB
C
451 lines
13 KiB
C
/* Copyright (C) 2000,2001 Salvatore Sanfilippo <antirez@invece.org>
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* See the LICENSE file for more information. */
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/* $Id: ars.h,v 1.3 2003/07/28 09:00:55 njombart Exp $ */
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#ifndef _ARS_H
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#define _ARS_H
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/* define before including sys/socket.h */
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#if defined(__APPLE__)
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#define _BSD_SOCKLEN_T_ int
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#endif
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#include <sys/types.h>
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#include <sys/socket.h>
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#include "systype.h"
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#include "in.h"
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#include "bytesex.h"
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#ifndef TRUE
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#define TRUE 1
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#define FALSE 0
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#endif
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#ifndef MIN
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#define MIN(x,y) ((x)<(y)?(x):(y))
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#endif
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#ifndef MAX
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#define MAX(x,y) ((x)>(y)?(x):(y))
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#endif
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#ifdef DEBUG
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#define __D(x) x
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#else
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#define __D(x) do { } while (0);
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#endif
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#ifndef __u8
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#define __u8 u_int8_t
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#define __u16 u_int16_t
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#define __u32 u_int32_t
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#endif
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/* error codes */
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#define ARS_OK 0
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#define ARS_ERROR 1
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#define ARS_NOSPACE 2
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#define ARS_NOMEM 3
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#define ARS_INVALID 4
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/* Headers size */
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#define ARS_ICMPHDR_SIZE sizeof(struct ars_icmphdr)
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#define ARS_UDPHDR_SIZE sizeof(struct ars_udphdr)
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#define ARS_TCPHDR_SIZE sizeof(struct ars_tcphdr)
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#define ARS_IPHDR_SIZE sizeof(struct ars_iphdr)
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#define ARS_PSEUDOHDR_SIZE sizeof(struct pseudohdr)
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/* IP defines */
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#define ARS_MAX_IP_SIZE 65535
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#define ARS_IP_MF ((unsigned short)0x2000) /* more fragments */
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#define ARS_IP_DF ((unsigned short)0x4000) /* dont fragment */
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#define ARS_IP_RF ((unsigned short)0x8000) /* reserved fragment flag */
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#define ARS_IPOPT_COPY 0x80
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#define ARS_IPOPT_CLASS_MASK 0x60
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#define ARS_IPOPT_NUMBER_MASK 0x1f
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#define ARS_IPOPT_COPIED(o) ((o)&ARS_IPOPT_COPY)
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#define ARS_IPOPT_CLASS(o) ((o)&ARS_IPOPT_CLASS_MASK)
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#define ARS_IPOPT_NUMBER(o) ((o)&ARS_IPOPT_NUMBER_MASK)
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#define ARS_IPOPT_CONTROL 0x00
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#define ARS_IPOPT_RESERVED1 0x20
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#define ARS_IPOPT_MEASUREMENT 0x40
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#define ARS_IPOPT_RESERVED2 0x60
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#define ARS_IPOPT_END (0 |ARS_IPOPT_CONTROL)
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#define ARS_IPOPT_NOOP (1 |ARS_IPOPT_CONTROL)
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#define ARS_IPOPT_SEC (2 |ARS_IPOPT_CONTROL|ARS_IPOPT_COPY)
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#define ARS_IPOPT_LSRR (3 |ARS_IPOPT_CONTROL|ARS_IPOPT_COPY)
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#define ARS_IPOPT_TIMESTAMP (4 |ARS_IPOPT_MEASUREMENT)
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#define ARS_IPOPT_RR (7 |ARS_IPOPT_CONTROL)
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#define ARS_IPOPT_SID (8 |ARS_IPOPT_CONTROL|ARS_IPOPT_COPY)
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#define ARS_IPOPT_SSRR (9 |ARS_IPOPT_CONTROL|ARS_IPOPT_COPY)
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#define ARS_IPOPT_RA (20|ARS_IPOPT_CONTROL|ARS_IPOPT_COPY)
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#define ARS_IPOPT_OPTVAL 0
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#define ARS_IPOPT_OLEN 1
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#define ARS_IPOPT_OFFSET 2
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#define ARS_IPOPT_MINOFF 4
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#define ARS_MAX_IPOPTLEN 40
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#define ARS_IPOPT_NOP ARS_IPOPT_NOOP
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#define ARS_IPOPT_EOL ARS_IPOPT_END
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#define ARS_IPOPT_TS ARS_IPOPT_TIMESTAMP
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#define ARS_IPOPT_TS_TSONLY 0 /* timestamps only */
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#define ARS_IPOPT_TS_TSANDADDR 1 /* timestamps and addresses */
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#define ARS_IPOPT_TS_PRESPEC 3 /* specified modules only */
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/* IPV4 and IPV6 string rappresentation len */
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#define ARS_INET_ADDRSTRLEN 16
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#define ARS_INET6_ADDRSTRLEN 46
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/* TCP */
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#define ARS_TCPOPT_EOL 0
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#define ARS_TCPOPT_NOP 1
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#define ARS_TCPOPT_MAXSEG 2
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#define ARS_TCPOPT_WINDOW 3
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#define ARS_TCPOPT_SACK_PERM 4
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#define ARS_TCPOPT_SACK 5
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#define ARS_TCPOPT_ECHOREQUEST 6
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#define ARS_TCPOPT_ECHOREPLY 7
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#define ARS_TCPOPT_TIMESTAMP 8
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#define ARS_TCP_TH_FIN 0x01
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#define ARS_TCP_TH_SYN 0x02
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#define ARS_TCP_TH_RST 0x04
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#define ARS_TCP_TH_PUSH 0x08
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#define ARS_TCP_TH_ACK 0x10
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#define ARS_TCP_TH_URG 0x20
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#define ARS_TCP_TH_X 0x40 /* X tcp flag */
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#define ARS_TCP_TH_Y 0x80 /* Y tcp flag */
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/* ICMP TYPE */
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#define ARS_ICMP_ECHOREPLY 0 /* Echo Reply */
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#define ARS_ICMP_DEST_UNREACH 3 /* Destination Unreachable */
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#define ARS_ICMP_SOURCE_QUENCH 4 /* Source Quench */
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#define ARS_ICMP_REDIRECT 5 /* Redirect (change route) */
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#define ARS_ICMP_ECHO 8 /* Echo Request */
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#define ARS_ICMP_TIME_EXCEEDED 11 /* Time Exceeded */
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#define ARS_ICMP_PARAMETERPROB 12 /* Parameter Problem */
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#define ARS_ICMP_TIMESTAMP 13 /* Timestamp Request */
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#define ARS_ICMP_TIMESTAMPREPLY 14 /* Timestamp Reply */
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#define ARS_ICMP_INFO_REQUEST 15 /* Information Request */
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#define ARS_ICMP_INFO_REPLY 16 /* Information Reply */
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#define ARS_ICMP_ADDRESS 17 /* Address Mask Request */
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#define ARS_ICMP_ADDRESSREPLY 18 /* Address Mask Reply */
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/* Codes for UNREACHABLE */
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#define ARS_ICMP_UNR_NET 0 /* Network Unreachable */
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#define ARS_ICMP_UNR_HOST 1 /* Host Unreachable */
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#define ARS_ICMP_UNR_PROT 2 /* Protocol Unreachable */
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#define ARS_ICMP_UNR_PORT 3 /* Port Unreachable */
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#define ARS_ICMP_UNR_FRAG_NEEDED 4 /* Fragmentation Needed,DF set*/
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#define ARS_ICMP_UNR_SR_FAILED 5 /* Source Route failed */
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#define ARS_ICMP_UNR_UNK_NET 6
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#define ARS_ICMP_UNR_UNK_HOST 7
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#define ARS_ICMP_UNR_ISOLATED_HOST 8
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#define ARS_ICMP_UNR_NET_ANO 9
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#define ARS_ICMP_UNR_HOST_ANO 10
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#define ARS_ICMP_UNR_NET_UNR_TOS 11
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#define ARS_ICMP_UNR_HOST_UNR_TOS 12
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#define ARS_ICMP_UNR_PKT_FILTERED 13 /* Packet filtered */
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#define ARS_ICMP_UNR_PREC_VIOLATION 14 /* Precedence violation */
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#define ARS_ICMP_UNR_PREC_CUTOFF 15 /* Precedence cut off */
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#define ARS_NR_ICMP_UNREACH 15 /* Instead of hardcoded immediate value */
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/* Codes for REDIRECT */
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#define ARS_ICMP_REDIR_NET 0 /* Redirect Net */
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#define ARS_ICMP_REDIR_HOST 1 /* Redirect Host */
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#define ARS_ICMP_REDIR_NETTOS 2 /* Redirect Net for TOS */
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#define ARS_ICMP_REDIR_HOSTTOS 3 /* Redirect Host for TOS */
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/* Codes for TIME_EXCEEDED */
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#define ARS_ICMP_EXC_TTL 0 /* TTL count exceeded */
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#define ARS_ICMP_EXC_FRAGTIME 1 /* TTL exceeded reassembling */
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/* The IP header structure */
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struct ars_iphdr {
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#if defined(BYTE_ORDER_LITTLE_ENDIAN)
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__u8 ihl:4,
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version:4;
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#elif defined (BYTE_ORDER_BIG_ENDIAN)
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__u8 version:4,
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ihl:4;
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#else
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#error "Please, edit Makefile and add -DBYTE_ORDER_(BIG|LITTLE)_ENDIAN"
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#endif
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__u8 tos;
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__u16 tot_len;
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__u16 id;
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__u16 frag_off;
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__u8 ttl;
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__u8 protocol;
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__u16 check;
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__u32 saddr;
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__u32 daddr;
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};
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/* The IP options structure */
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struct ars_ipopt {
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u_int8_t kind;
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u_int8_t len;
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union {
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struct {
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u_int16_t s;
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u_int16_t c;
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u_int16_t h;
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u_int8_t tcc[3];
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} sec; /* security */
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struct {
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u_int8_t ptr;
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u_int8_t data[37];
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} src; /* loose and strinct source routing */
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struct {
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u_int8_t ptr;
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u_int8_t data[37];
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} rr; /* record route */
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struct {
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u_int16_t id;
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} sid; /* stream id */
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struct {
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u_int8_t ptr;
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u_int8_t flags;
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u_int8_t data[36];
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} tstamp; /* timestamp */
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} un;
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};
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/* The UDP header structure */
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struct ars_udphdr {
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__u16 uh_sport; /* source port */
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__u16 uh_dport; /* destination port */
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__u16 uh_ulen; /* udp length */
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__u16 uh_sum; /* udp checksum */
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};
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/* The TCP header structure */
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struct ars_tcphdr {
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__u16 th_sport; /* source port */
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__u16 th_dport; /* destination port */
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__u32 th_seq; /* sequence number */
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__u32 th_ack; /* acknowledgement number */
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#if defined (BYTE_ORDER_LITTLE_ENDIAN)
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__u8 th_x2:4, /* (unused) */
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th_off:4; /* data offset */
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#elif defined (BYTE_ORDER_BIG_ENDIAN)
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__u8 th_off:4, /* data offset */
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th_x2:4; /* (unused) */
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#else
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#error "Please, edit Makefile and add -DBYTE_ORDER_(BIG|LITTLE)_ENDIAN"
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#endif
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__u8 th_flags;
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__u16 th_win; /* window */
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__u16 th_sum; /* checksum */
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__u16 th_urp; /* urgent pointer */
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};
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/* The TCP options structure */
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struct ars_tcpopt {
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u_int8_t kind;
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u_int8_t len;
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union {
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struct {
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u_int16_t size;
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} mss;
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struct {
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u_int8_t shift;
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} win;
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struct {
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u_int16_t origin;
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u_int16_t size;
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} sack[10]; /* 10 SACK blocks in 44 bytes of space */
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struct {
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u_int8_t info[4];
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} echo;
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struct {
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u_int8_t tsval[4];
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u_int8_t tsecr[4];
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} timestamp;
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} un;
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};
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/* The ICMP header structure */
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struct ars_icmphdr
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{
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__u8 type;
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__u8 code;
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__u16 checksum;
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union
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{
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struct
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{
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__u16 id;
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__u16 sequence;
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} echo; /* called echo since it's the most used */
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__u32 gateway;
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} un;
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};
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/* TCP/UDP pseudo header used to compute the checksum */
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struct ars_pseudohdr
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{
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__u32 saddr;
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__u32 daddr;
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__u8 zero;
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__u8 protocol;
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__u16 lenght;
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};
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struct ars_packet; /* forward declaration */
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/* ARS layer */
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struct ars_layer {
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int l_type;
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int l_size;
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int l_flags;
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void *l_data;
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struct ars_packet *l_packet;
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};
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#define ARS_MAX_LAYER 16
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/* Types */
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#define ARS_TYPE_SIZE 32
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#define ARS_TYPE_NULL 0
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#define ARS_TYPE_IP 1
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#define ARS_TYPE_IPOPT 2
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#define ARS_TYPE_ICMP 3
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#define ARS_TYPE_UDP 4
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#define ARS_TYPE_TCP 5
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#define ARS_TYPE_TCPOPT 6
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#define ARS_TYPE_DATA 31
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/* ARS packet context */
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struct ars_packet {
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char *p_error;
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int p_layer_nr;
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struct ars_layer p_layer[ARS_MAX_LAYER];
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void *p_default[ARS_TYPE_SIZE];
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int aux; /* Auxiliar variable for data exchange between functions */
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};
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/* Facility to check for flags */
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#define ARS_TAKE(f,x) (f & x)
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#define ARS_DONTTAKE(f, x) (!(f & x))
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#define ARS_TAKE_NONE 0
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/* IP layer flags */
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#define ARS_TAKE_IP_VERSION (1 << 0)
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#define ARS_TAKE_IP_HDRLEN (1 << 1)
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#define ARS_TAKE_IP_TOTLEN (1 << 2)
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#define ARS_TAKE_IP_PROTOCOL (1 << 3)
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#define ARS_TAKE_IP_CKSUM (1 << 4)
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/* ICMP layer flags */
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#define ARS_TAKE_ICMP_CKSUM (1 << 0)
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/* UDP layer flags */
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#define ARS_TAKE_UDP_CKSUM (1 << 0)
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#define ARS_TAKE_UDP_LEN (1 << 1)
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/* TCP layer flags */
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#define ARS_TAKE_TCP_HDRLEN (1 << 0)
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#define ARS_TAKE_TCP_CKSUM (1 << 1)
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/* Some function that acts on layer switch to the last layer with this */
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#define ARS_LAST_LAYER -1
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/* Structure and defines needed to calculate the internet-like checksum
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* when the data is splitted in more not adjacent buffers */
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#define ARS_MC_INIT 0
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#define ARS_MC_UPDATE 1
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#define ARS_MC_FINAL 2
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struct mc_context {
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u_int32_t oddbyte_flag;
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u_int32_t old;
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u_int8_t oddbyte;
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u_int8_t pad;
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};
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/* ARS layer info structure */
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struct ars_layer_info {
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char *li_name; /* NULL = unused slot */
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int (*li_compiler) (struct ars_packet *pkt, int layer); /* NULL = NOP */
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int layer_id;
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};
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/* ARS layer info table */
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struct ars_layer_info ars_linfo[ARS_TYPE_SIZE];
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/* ARS interface managment structure and defines */
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#define ARS_IF_UP (1 << 0)
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#define ARS_IF_LOOP (1 << 1)
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#define ARS_IF_IPV4 (1 << 2)
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#define ARS_IF_IPV6 (1 << 3)
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#define ARS_IF_MISCONF (1 << 4)
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#define ARS_IF_MAX_IFACE 16
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#define ARS_IF_NAME_SIZE 32
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/* iface type are obtained using libpcap to avoid efforts duplication */
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struct ars_iface {
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char if_name[ARS_IF_NAME_SIZE];
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int if_mtu;
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int if_flags;
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char if_ipv4addr[ARS_INET_ADDRSTRLEN];
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char if_ipv6addr[ARS_INET6_ADDRSTRLEN];
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};
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/* Flags for packet splitting */
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#define ARS_SPLIT_FTRUNC (1 << 0)
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#define ARS_SPLIT_FBADCKSUM (1 << 1)
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/* More macros */
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#define ars_atou(x) strtoul(x, (char **) NULL, 0)
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/* Prototypes */
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int ars_init(struct ars_packet *pkt);
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int ars_destroy(struct ars_packet *pkt);
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int ars_nospace(struct ars_packet *pkt);
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int ars_add_generic(struct ars_packet *pkt, size_t size, int type);
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void *ars_add_iphdr(struct ars_packet *pkt, int unused);
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void *ars_add_ipopt(struct ars_packet *pkt, int option);
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void *ars_add_udphdr(struct ars_packet *pkt, int unused);
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void *ars_add_tcphdr(struct ars_packet *pkt, int unused);
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void *ars_add_tcpopt(struct ars_packet *pkt, int option);
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void *ars_add_icmphdr(struct ars_packet *pkt, int unused);
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void *ars_add_data(struct ars_packet *pkt, int size);
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size_t ars_relative_size(struct ars_packet *pkt, int layer_nr);
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size_t ars_packet_size(struct ars_packet *pkt);
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u_int16_t ars_cksum(void *vbuf, size_t nbytes);
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u_int16_t ars_multi_cksum(struct mc_context *c, int op, void *vbuf, size_t nbytes);
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int ars_compile(struct ars_packet *pkt);
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int ars_udptcp_cksum(struct ars_packet *pkt, int layer, u_int16_t *sum);
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int ars_open_rawsocket(struct ars_packet *pkt);
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int ars_build_packet(struct ars_packet *pkt, unsigned char **packet, size_t *size);
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int ars_bsd_fix(struct ars_packet *pkt, unsigned char *packet, size_t size);
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int ars_set_flags(struct ars_packet *pkt, int layer, int flags);
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int ars_send(int s, struct ars_packet *pkt, struct sockaddr *sa, socklen_t slen);
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int ars_resolve(struct ars_packet *pkt, u_int32_t *dest, char *hostname);
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int ars_set_error(struct ars_packet *pkt, char *error);
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int ars_d_build(struct ars_packet *pkt, char *t);
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int ars_valid_layer(int layer);
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int ars_get_iface_list(struct ars_iface *iface, size_t *isize);
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int ars_get_iface(char *name, struct ars_iface *i);
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int ars_valid_layer(int layer);
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int ars_remove_layer(struct ars_packet *pkt, int layer);
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/* split.c prototypes */
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int ars_seems_ip(struct ars_iphdr *ip, size_t size);
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int ars_guess_ipoff(void *packet, size_t size, int *lhs);
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int ars_check_ip_cksum(struct ars_iphdr *ip);
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int ars_check_icmp_cksum(struct ars_icmphdr *icmp, size_t size);
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int ars_split_packet(void *packet, size_t size, int ipoff, struct ars_packet *pkt);
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#endif /* _ARS_H */
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