/* Copyright (C) 2000,2001 Salvatore Sanfilippo <antirez@invece.org>
* See the LICENSE file for more information. */
/* $Id: ars.h,v 1.1.1.1 2012/02/21 22:11:37 misho Exp $ */
#ifndef _ARS_H
#define _ARS_H
/* define before including sys/socket.h */
#if defined(__APPLE__)
#define _BSD_SOCKLEN_T_ int
#endif
#include <sys/types.h>
#include <sys/socket.h>
#include "systype.h"
#include "in.h"
#include "bytesex.h"
#ifndef TRUE
#define TRUE 1
#define FALSE 0
#endif
#ifndef MIN
#define MIN(x,y) ((x)<(y)?(x):(y))
#endif
#ifndef MAX
#define MAX(x,y) ((x)>(y)?(x):(y))
#endif
#ifdef DEBUG
#define __D(x) x
#else
#define __D(x) do { } while (0);
#endif
#ifndef __u8
#define __u8 u_int8_t
#define __u16 u_int16_t
#define __u32 u_int32_t
#endif
/* error codes */
#define ARS_OK 0
#define ARS_ERROR 1
#define ARS_NOSPACE 2
#define ARS_NOMEM 3
#define ARS_INVALID 4
/* Headers size */
#define ARS_ICMPHDR_SIZE sizeof(struct ars_icmphdr)
#define ARS_UDPHDR_SIZE sizeof(struct ars_udphdr)
#define ARS_TCPHDR_SIZE sizeof(struct ars_tcphdr)
#define ARS_IPHDR_SIZE sizeof(struct ars_iphdr)
#define ARS_PSEUDOHDR_SIZE sizeof(struct pseudohdr)
/* IP defines */
#define ARS_MAX_IP_SIZE 65535
#define ARS_IP_MF ((unsigned short)0x2000) /* more fragments */
#define ARS_IP_DF ((unsigned short)0x4000) /* dont fragment */
#define ARS_IP_RF ((unsigned short)0x8000) /* reserved fragment flag */
#define ARS_IPOPT_COPY 0x80
#define ARS_IPOPT_CLASS_MASK 0x60
#define ARS_IPOPT_NUMBER_MASK 0x1f
#define ARS_IPOPT_COPIED(o) ((o)&ARS_IPOPT_COPY)
#define ARS_IPOPT_CLASS(o) ((o)&ARS_IPOPT_CLASS_MASK)
#define ARS_IPOPT_NUMBER(o) ((o)&ARS_IPOPT_NUMBER_MASK)
#define ARS_IPOPT_CONTROL 0x00
#define ARS_IPOPT_RESERVED1 0x20
#define ARS_IPOPT_MEASUREMENT 0x40
#define ARS_IPOPT_RESERVED2 0x60
#define ARS_IPOPT_END (0 |ARS_IPOPT_CONTROL)
#define ARS_IPOPT_NOOP (1 |ARS_IPOPT_CONTROL)
#define ARS_IPOPT_SEC (2 |ARS_IPOPT_CONTROL|ARS_IPOPT_COPY)
#define ARS_IPOPT_LSRR (3 |ARS_IPOPT_CONTROL|ARS_IPOPT_COPY)
#define ARS_IPOPT_TIMESTAMP (4 |ARS_IPOPT_MEASUREMENT)
#define ARS_IPOPT_RR (7 |ARS_IPOPT_CONTROL)
#define ARS_IPOPT_SID (8 |ARS_IPOPT_CONTROL|ARS_IPOPT_COPY)
#define ARS_IPOPT_SSRR (9 |ARS_IPOPT_CONTROL|ARS_IPOPT_COPY)
#define ARS_IPOPT_RA (20|ARS_IPOPT_CONTROL|ARS_IPOPT_COPY)
#define ARS_IPOPT_OPTVAL 0
#define ARS_IPOPT_OLEN 1
#define ARS_IPOPT_OFFSET 2
#define ARS_IPOPT_MINOFF 4
#define ARS_MAX_IPOPTLEN 40
#define ARS_IPOPT_NOP ARS_IPOPT_NOOP
#define ARS_IPOPT_EOL ARS_IPOPT_END
#define ARS_IPOPT_TS ARS_IPOPT_TIMESTAMP
#define ARS_IPOPT_TS_TSONLY 0 /* timestamps only */
#define ARS_IPOPT_TS_TSANDADDR 1 /* timestamps and addresses */
#define ARS_IPOPT_TS_PRESPEC 3 /* specified modules only */
/* IPV4 and IPV6 string rappresentation len */
#define ARS_INET_ADDRSTRLEN 16
#define ARS_INET6_ADDRSTRLEN 46
/* TCP */
#define ARS_TCPOPT_EOL 0
#define ARS_TCPOPT_NOP 1
#define ARS_TCPOPT_MAXSEG 2
#define ARS_TCPOPT_WINDOW 3
#define ARS_TCPOPT_SACK_PERM 4
#define ARS_TCPOPT_SACK 5
#define ARS_TCPOPT_ECHOREQUEST 6
#define ARS_TCPOPT_ECHOREPLY 7
#define ARS_TCPOPT_TIMESTAMP 8
#define ARS_TCP_TH_FIN 0x01
#define ARS_TCP_TH_SYN 0x02
#define ARS_TCP_TH_RST 0x04
#define ARS_TCP_TH_PUSH 0x08
#define ARS_TCP_TH_ACK 0x10
#define ARS_TCP_TH_URG 0x20
#define ARS_TCP_TH_X 0x40 /* X tcp flag */
#define ARS_TCP_TH_Y 0x80 /* Y tcp flag */
/* ICMP TYPE */
#define ARS_ICMP_ECHOREPLY 0 /* Echo Reply */
#define ARS_ICMP_DEST_UNREACH 3 /* Destination Unreachable */
#define ARS_ICMP_SOURCE_QUENCH 4 /* Source Quench */
#define ARS_ICMP_REDIRECT 5 /* Redirect (change route) */
#define ARS_ICMP_ECHO 8 /* Echo Request */
#define ARS_ICMP_TIME_EXCEEDED 11 /* Time Exceeded */
#define ARS_ICMP_PARAMETERPROB 12 /* Parameter Problem */
#define ARS_ICMP_TIMESTAMP 13 /* Timestamp Request */
#define ARS_ICMP_TIMESTAMPREPLY 14 /* Timestamp Reply */
#define ARS_ICMP_INFO_REQUEST 15 /* Information Request */
#define ARS_ICMP_INFO_REPLY 16 /* Information Reply */
#define ARS_ICMP_ADDRESS 17 /* Address Mask Request */
#define ARS_ICMP_ADDRESSREPLY 18 /* Address Mask Reply */
/* Codes for UNREACHABLE */
#define ARS_ICMP_UNR_NET 0 /* Network Unreachable */
#define ARS_ICMP_UNR_HOST 1 /* Host Unreachable */
#define ARS_ICMP_UNR_PROT 2 /* Protocol Unreachable */
#define ARS_ICMP_UNR_PORT 3 /* Port Unreachable */
#define ARS_ICMP_UNR_FRAG_NEEDED 4 /* Fragmentation Needed,DF set*/
#define ARS_ICMP_UNR_SR_FAILED 5 /* Source Route failed */
#define ARS_ICMP_UNR_UNK_NET 6
#define ARS_ICMP_UNR_UNK_HOST 7
#define ARS_ICMP_UNR_ISOLATED_HOST 8
#define ARS_ICMP_UNR_NET_ANO 9
#define ARS_ICMP_UNR_HOST_ANO 10
#define ARS_ICMP_UNR_NET_UNR_TOS 11
#define ARS_ICMP_UNR_HOST_UNR_TOS 12
#define ARS_ICMP_UNR_PKT_FILTERED 13 /* Packet filtered */
#define ARS_ICMP_UNR_PREC_VIOLATION 14 /* Precedence violation */
#define ARS_ICMP_UNR_PREC_CUTOFF 15 /* Precedence cut off */
#define ARS_NR_ICMP_UNREACH 15 /* Instead of hardcoded immediate value */
/* Codes for REDIRECT */
#define ARS_ICMP_REDIR_NET 0 /* Redirect Net */
#define ARS_ICMP_REDIR_HOST 1 /* Redirect Host */
#define ARS_ICMP_REDIR_NETTOS 2 /* Redirect Net for TOS */
#define ARS_ICMP_REDIR_HOSTTOS 3 /* Redirect Host for TOS */
/* Codes for TIME_EXCEEDED */
#define ARS_ICMP_EXC_TTL 0 /* TTL count exceeded */
#define ARS_ICMP_EXC_FRAGTIME 1 /* TTL exceeded reassembling */
/* The IP header structure */
struct ars_iphdr {
#if defined(BYTE_ORDER_LITTLE_ENDIAN)
__u8 ihl:4,
version:4;
#elif defined (BYTE_ORDER_BIG_ENDIAN)
__u8 version:4,
ihl:4;
#else
#error "Please, edit Makefile and add -DBYTE_ORDER_(BIG|LITTLE)_ENDIAN"
#endif
__u8 tos;
__u16 tot_len;
__u16 id;
__u16 frag_off;
__u8 ttl;
__u8 protocol;
__u16 check;
__u32 saddr;
__u32 daddr;
};
/* The IP options structure */
struct ars_ipopt {
u_int8_t kind;
u_int8_t len;
union {
struct {
u_int16_t s;
u_int16_t c;
u_int16_t h;
u_int8_t tcc[3];
} sec; /* security */
struct {
u_int8_t ptr;
u_int8_t data[37];
} src; /* loose and strinct source routing */
struct {
u_int8_t ptr;
u_int8_t data[37];
} rr; /* record route */
struct {
u_int16_t id;
} sid; /* stream id */
struct {
u_int8_t ptr;
u_int8_t flags;
u_int8_t data[36];
} tstamp; /* timestamp */
} un;
};
/* The UDP header structure */
struct ars_udphdr {
__u16 uh_sport; /* source port */
__u16 uh_dport; /* destination port */
__u16 uh_ulen; /* udp length */
__u16 uh_sum; /* udp checksum */
};
/* The TCP header structure */
struct ars_tcphdr {
__u16 th_sport; /* source port */
__u16 th_dport; /* destination port */
__u32 th_seq; /* sequence number */
__u32 th_ack; /* acknowledgement number */
#if defined (BYTE_ORDER_LITTLE_ENDIAN)
__u8 th_x2:4, /* (unused) */
th_off:4; /* data offset */
#elif defined (BYTE_ORDER_BIG_ENDIAN)
__u8 th_off:4, /* data offset */
th_x2:4; /* (unused) */
#else
#error "Please, edit Makefile and add -DBYTE_ORDER_(BIG|LITTLE)_ENDIAN"
#endif
__u8 th_flags;
__u16 th_win; /* window */
__u16 th_sum; /* checksum */
__u16 th_urp; /* urgent pointer */
};
/* The TCP options structure */
struct ars_tcpopt {
u_int8_t kind;
u_int8_t len;
union {
struct {
u_int16_t size;
} mss;
struct {
u_int8_t shift;
} win;
struct {
u_int16_t origin;
u_int16_t size;
} sack[10]; /* 10 SACK blocks in 44 bytes of space */
struct {
u_int8_t info[4];
} echo;
struct {
u_int8_t tsval[4];
u_int8_t tsecr[4];
} timestamp;
} un;
};
/* The ICMP header structure */
struct ars_icmphdr
{
__u8 type;
__u8 code;
__u16 checksum;
union
{
struct
{
__u16 id;
__u16 sequence;
} echo; /* called echo since it's the most used */
__u32 gateway;
} un;
};
/* TCP/UDP pseudo header used to compute the checksum */
struct ars_pseudohdr
{
__u32 saddr;
__u32 daddr;
__u8 zero;
__u8 protocol;
__u16 lenght;
};
struct ars_packet; /* forward declaration */
/* ARS layer */
struct ars_layer {
int l_type;
int l_size;
int l_flags;
void *l_data;
struct ars_packet *l_packet;
};
#define ARS_MAX_LAYER 16
/* Types */
#define ARS_TYPE_SIZE 32
#define ARS_TYPE_NULL 0
#define ARS_TYPE_IP 1
#define ARS_TYPE_IPOPT 2
#define ARS_TYPE_ICMP 3
#define ARS_TYPE_UDP 4
#define ARS_TYPE_TCP 5
#define ARS_TYPE_TCPOPT 6
#define ARS_TYPE_DATA 31
/* ARS packet context */
struct ars_packet {
char *p_error;
int p_layer_nr;
struct ars_layer p_layer[ARS_MAX_LAYER];
void *p_default[ARS_TYPE_SIZE];
int aux; /* Auxiliar variable for data exchange between functions */
};
/* Facility to check for flags */
#define ARS_TAKE(f,x) (f & x)
#define ARS_DONTTAKE(f, x) (!(f & x))
#define ARS_TAKE_NONE 0
/* IP layer flags */
#define ARS_TAKE_IP_VERSION (1 << 0)
#define ARS_TAKE_IP_HDRLEN (1 << 1)
#define ARS_TAKE_IP_TOTLEN (1 << 2)
#define ARS_TAKE_IP_PROTOCOL (1 << 3)
#define ARS_TAKE_IP_CKSUM (1 << 4)
/* ICMP layer flags */
#define ARS_TAKE_ICMP_CKSUM (1 << 0)
/* UDP layer flags */
#define ARS_TAKE_UDP_CKSUM (1 << 0)
#define ARS_TAKE_UDP_LEN (1 << 1)
/* TCP layer flags */
#define ARS_TAKE_TCP_HDRLEN (1 << 0)
#define ARS_TAKE_TCP_CKSUM (1 << 1)
/* Some function that acts on layer switch to the last layer with this */
#define ARS_LAST_LAYER -1
/* Structure and defines needed to calculate the internet-like checksum
* when the data is splitted in more not adjacent buffers */
#define ARS_MC_INIT 0
#define ARS_MC_UPDATE 1
#define ARS_MC_FINAL 2
struct mc_context {
u_int32_t oddbyte_flag;
u_int32_t old;
u_int8_t oddbyte;
u_int8_t pad;
};
/* ARS layer info structure */
struct ars_layer_info {
char *li_name; /* NULL = unused slot */
int (*li_compiler) (struct ars_packet *pkt, int layer); /* NULL = NOP */
int layer_id;
};
/* ARS layer info table */
struct ars_layer_info ars_linfo[ARS_TYPE_SIZE];
/* ARS interface managment structure and defines */
#define ARS_IF_UP (1 << 0)
#define ARS_IF_LOOP (1 << 1)
#define ARS_IF_IPV4 (1 << 2)
#define ARS_IF_IPV6 (1 << 3)
#define ARS_IF_MISCONF (1 << 4)
#define ARS_IF_MAX_IFACE 16
#define ARS_IF_NAME_SIZE 32
/* iface type are obtained using libpcap to avoid efforts duplication */
struct ars_iface {
char if_name[ARS_IF_NAME_SIZE];
int if_mtu;
int if_flags;
char if_ipv4addr[ARS_INET_ADDRSTRLEN];
char if_ipv6addr[ARS_INET6_ADDRSTRLEN];
};
/* Flags for packet splitting */
#define ARS_SPLIT_FTRUNC (1 << 0)
#define ARS_SPLIT_FBADCKSUM (1 << 1)
/* More macros */
#define ars_atou(x) strtoul(x, (char **) NULL, 0)
/* Prototypes */
int ars_init(struct ars_packet *pkt);
int ars_destroy(struct ars_packet *pkt);
int ars_nospace(struct ars_packet *pkt);
int ars_add_generic(struct ars_packet *pkt, size_t size, int type);
void *ars_add_iphdr(struct ars_packet *pkt, int unused);
void *ars_add_ipopt(struct ars_packet *pkt, int option);
void *ars_add_udphdr(struct ars_packet *pkt, int unused);
void *ars_add_tcphdr(struct ars_packet *pkt, int unused);
void *ars_add_tcpopt(struct ars_packet *pkt, int option);
void *ars_add_icmphdr(struct ars_packet *pkt, int unused);
void *ars_add_data(struct ars_packet *pkt, int size);
size_t ars_relative_size(struct ars_packet *pkt, int layer_nr);
size_t ars_packet_size(struct ars_packet *pkt);
u_int16_t ars_cksum(void *vbuf, size_t nbytes);
u_int16_t ars_multi_cksum(struct mc_context *c, int op, void *vbuf, size_t nbytes);
int ars_compile(struct ars_packet *pkt);
int ars_udptcp_cksum(struct ars_packet *pkt, int layer, u_int16_t *sum);
int ars_open_rawsocket(struct ars_packet *pkt);
int ars_build_packet(struct ars_packet *pkt, unsigned char **packet, size_t *size);
int ars_bsd_fix(struct ars_packet *pkt, unsigned char *packet, size_t size);
int ars_set_flags(struct ars_packet *pkt, int layer, int flags);
int ars_send(int s, struct ars_packet *pkt, struct sockaddr *sa, socklen_t slen);
int ars_resolve(struct ars_packet *pkt, u_int32_t *dest, char *hostname);
int ars_set_error(struct ars_packet *pkt, char *error);
int ars_d_build(struct ars_packet *pkt, char *t);
int ars_valid_layer(int layer);
int ars_get_iface_list(struct ars_iface *iface, size_t *isize);
int ars_get_iface(char *name, struct ars_iface *i);
int ars_valid_layer(int layer);
int ars_remove_layer(struct ars_packet *pkt, int layer);
/* split.c prototypes */
int ars_seems_ip(struct ars_iphdr *ip, size_t size);
int ars_guess_ipoff(void *packet, size_t size, int *lhs);
int ars_check_ip_cksum(struct ars_iphdr *ip);
int ars_check_icmp_cksum(struct ars_icmphdr *icmp, size_t size);
int ars_split_packet(void *packet, size_t size, int ipoff, struct ars_packet *pkt);
#endif /* _ARS_H */
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