winpcap源码c++版

/*#define CHASE_CHAIN*/ /* * Copyright (c) 1990, 1991, 1992, 1993, 1994, 1995, 1996, 1997, 1998 * The Regents of the University of California. All rights reserved. * * Redistribution and use in source and binary forms, with or without * modification, are permitted provided that: (1) source code distributions * retain the above copyright notice and this paragraph in its entirety, (2) * distributions including binary code include the above copyright notice and * this paragraph in its entirety in the documentation or other materials * provided with the distribution, and (3) all advertising materials mentioning * features or use of this software display the following acknowledgement: * ``This product includes software developed by the University of California, * Lawrence Berkeley Laboratory and its contributors.'' Neither the name of * the University nor the names of its contributors may be used to endorse * or promote products derived from this software without specific prior * written permission. * THIS SOFTWARE IS PROVIDED ``AS IS'' AND WITHOUT ANY EXPRESS OR IMPLIED * WARRANTIES, INCLUDING, WITHOUT LIMITATION, THE IMPLIED WARRANTIES OF * MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE. */ #ifndef lint static const char rcsid[] = "@(#) $Header: /tcpdump/master/libpcap/gencode.c,v 1.221.2.43 2006/09/13 07:36:19 guy Exp $ (LBL)"; #endif #ifdef HAVE_CONFIG_H #include "config.h" #endif #ifdef WIN32 #include <pcap-stdinc.h> #else /* WIN32 */ #include <sys/types.h> #include <sys/socket.h> #endif /* WIN32 */ #ifdef DEBUG_TOOL #include "debugTool.h" #endif /* * XXX - why was this included even on UNIX? */ #ifdef __MINGW32__ #include "IP6_misc.h" #endif #ifndef WIN32 #ifdef __NetBSD__ #include <sys/param.h> #endif #include <netinet/in.h> #endif /* WIN32 */ #include <stdlib.h> #include <string.h> #include <memory.h> #include <setjmp.h> #include <stdarg.h> #ifdef MSDOS #include "pcap-dos.h" #endif #include "pcap-int.h" #include "ethertype.h" #include "nlpid.h" #include "llc.h" #include "gencode.h" #include "atmuni31.h" #include "sunatmpos.h" #include "ppp.h" #include "sll.h" #include "arcnet.h" #include "pf.h" #ifndef offsetof #define offsetof(s, e) ((size_t)&((s *)0)->e) #endif #ifdef INET6 #ifndef WIN32 #include <netdb.h> /* for "struct addrinfo" */ #endif /* WIN32 */ #endif /*INET6*/ #include <pcap-namedb.h> #define ETHERMTU 1500 #ifndef IPPROTO_SCTP #define IPPROTO_SCTP 132 #endif #ifdef HAVE_OS_PROTO_H #include "os-proto.h" #endif #define JMP(c) ((c)|BPF_JMP|BPF_K) /* Locals */ static jmp_buf top_ctx; static pcap_t *bpf_pcap; /* Hack for updating VLAN, MPLS, and PPPoE offsets. */ static u_int orig_linktype = -1U, orig_nl = -1U, label_stack_depth = -1U; /* XXX */ #ifdef PCAP_FDDIPAD static int pcap_fddipad; #endif //debug #ifndef MAX #define MAX(a,b) ((a)>(b)?(a):(b)) #endif static int find_levels_rd(struct block *b) { int level; if(JT(b)){ int tLevel = find_levels_rd(JT(b)); int fLevel = find_levels_rd(JF(b)); level = MAX(JT(b)->level,JF(b)->level) + 1; } else level = 0; b->level = level; return level; } /* VARARGS */ void bpf_error(const char *fmt, ...) { va_list ap; va_start(ap, fmt); if (bpf_pcap != NULL) (void)vsnprintf(pcap_geterr(bpf_pcap), PCAP_ERRBUF_SIZE, fmt, ap); va_end(ap); longjmp(top_ctx, 1); /* NOTREACHED */ } static void init_linktype(pcap_t *); static int alloc_reg(void); static void free_reg(int); static struct block *root; /* * Value passed to gen_load_a() to indicate what the offset argument * is relative to. */ enum e_offrel { OR_PACKET, /* relative to the beginning of the packet */ OR_LINK, /* relative to the link-layer header */ OR_NET, /* relative to the network-layer header */ OR_NET_NOSNAP, /* relative to the network-layer header, with no SNAP header at the link layer */ OR_TRAN_IPV4, /* relative to the transport-layer header, with IPv4 network layer */ OR_TRAN_IPV6 /* relative to the transport-layer header, with IPv6 network layer */ }; /* * We divy out chunks of memory rather than call malloc each time so * we don't have to worry about leaking memory. It's probably * not a big deal if all this memory was wasted but if this ever * goes into a library that would probably not be a good idea. * * XXX - this *is* in a library.... */ #define NCHUNKS 16 #define CHUNK0SIZE 1024 struct chunk { u_int n_left; void *m; }; static struct chunk chunks[NCHUNKS]; static int cur_chunk; static void *newchunk(u_int); static void freechunks(void); static inline struct block *new_block(int); static inline struct slist *new_stmt(int); static struct block *gen_retblk(int); static inline void syntax(void); static void backpatch(struct block *, struct block *); static void merge(struct block *, struct block *); static struct block *gen_cmp(enum e_offrel, u_int, u_int, bpf_int32); static struct block *gen_cmp_gt(enum e_offrel, u_int, u_int, bpf_int32); static struct block *gen_cmp_ge(enum e_offrel, u_int, u_int, bpf_int32); static struct block *gen_cmp_lt(enum e_offrel, u_int, u_int, bpf_int32); static struct block *gen_cmp_le(enum e_offrel, u_int, u_int, bpf_int32); static struct block *gen_mcmp(enum e_offrel, u_int, u_int, bpf_int32, bpf_u_int32); static struct block *gen_bcmp(enum e_offrel, u_int, u_int, const u_char *); static struct block *gen_ncmp(enum e_offrel, bpf_u_int32, bpf_u_int32, bpf_u_int32, bpf_u_int32, int, bpf_int32); static struct slist *gen_load_llrel(u_int, u_int); static struct slist *gen_load_a(enum e_offrel, u_int, u_int); static struct slist *gen_loadx_iphdrlen(void); static struct block *gen_uncond(int); static inline struct block *gen_true(void); static inline struct block *gen_false(void); static struct block *gen_ether_linktype(int); static struct block *gen_linux_sll_linktype(int); static void insert_radiotap_load_llprefixlen(struct block *); static void insert_load_llprefixlen(struct block *); static struct slist *gen_llprefixlen(void); static struct block *gen_linktype(int); static struct block *gen_snap(bpf_u_int32, bpf_u_int32, u_int); static struct block *gen_llc_linktype(int); static struct block *gen_hostop(bpf_u_int32, bpf_u_int32, int, int, u_int, u_int); #ifdef INET6 static struct block *gen_hostop6(struct in6_addr *, struct in6_addr *, int, int, u_int, u_int); #endif static struct block *gen_ahostop(const u_char *, int); static struct block *gen_ehostop(const u_char *, int); static struct block *gen_fhostop(const u_char *, int); static struct block *gen_thostop(const u_char *, int); static struct block *gen_wlanhostop(const u_char *, int); static struct block *gen_ipfchostop(const u_char *, int); static struct block *gen_dnhostop(bpf_u_int32, int); static struct block *gen_mpls_linktype(int); static struct block *gen_host(bpf_u_int32, bpf_u_int32, int, int, int); #ifdef INET6 static struct block *gen_host6(struct in6_addr *, struct in6_addr *, int, int, int); #endif #ifndef INET6 static struct block *gen_gateway(const u_char *, bpf_u_int32 **, int, int); #endif static struct block *gen_ipfrag(void); static struct block *gen_portatom(int, bpf_int32); static struct block *gen_portrangeatom(int, bpf_int32, bpf_int32); #ifdef INET6 static struct block *gen_portatom6(int, bpf_int32); static struct block *gen_portrangeatom6(int, bpf_int32, bpf_int32); #endif struct block *gen_portop(int, int, int); static struct block *gen_port(int, int, int); struct block *gen_portrangeop(int, int, int, int); static struct block *gen_portrange(int, int, int, int); #ifdef INET6 struct block *gen_portop6(int, int, int); static struct block *gen_port6(int, int, int); struct block *gen_portrangeop6(int, int, int, int); static struct block *gen_portrange6(int, int, int, int); #endif static int lookup_