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34 * @(#) $Header: /tcpdump/master/libpcap/pcap.h,v 1.31 2000/10/28 00:01:31 guy Exp $ (LBL)
40 #include <sys/types.h>
51 #define PCAP_VERSION_MAJOR 2
52 #define PCAP_VERSION_MINOR 4
54 #define PCAP_ERRBUF_SIZE 256
57 * Compatibility for systems that have a bpf.h that
58 * predates the bpf typedefs for 64-bit support.
60 #if BPF_RELEASE - 0 < 199406
61 typedef int bpf_int32;
62 typedef u_int bpf_u_int32;
65 typedef struct pcap pcap_t;
66 typedef struct pcap_dumper pcap_dumper_t;
69 * The first record in the file contains saved values for some
70 * of the flags used in the printout phases of tcpdump.
71 * Many fields here are 32 bit ints so compilers won't insert unwanted
72 * padding; these files need to be interchangeable across architectures.
74 * Do not change the layout of this structure, in any way (this includes
75 * changes that only affect the length of fields in this structure).
77 * Also, do not change the interpretation of any of the members of this
78 * structure, in any way (this includes using values other than
79 * LINKTYPE_ values, as defined in "savefile.c", in the "linktype"
84 * introduce a new structure for the new format, if the layout
85 * of the structure changed;
87 * send mail to "tcpdump-workers@tcpdump.org", requesting a new
88 * magic number for your new capture file format, and, when
89 * you get the new magic number, put it in "savefile.c";
91 * use that magic number for save files with the changed file
94 * make the code in "savefile.c" capable of reading files with
95 * the old file header as well as files with the new file header
96 * (using the magic number to determine the header format).
98 * Then supply the changes to "patches@tcpdump.org", so that future
99 * versions of libpcap and programs that use it (such as tcpdump) will
100 * be able to read your new capture file format.
102 struct pcap_file_header {
104 u_short version_major;
105 u_short version_minor;
106 bpf_int32 thiszone; /* gmt to local correction */
107 bpf_u_int32 sigfigs; /* accuracy of timestamps */
108 bpf_u_int32 snaplen; /* max length saved portion of each pkt */
109 bpf_u_int32 linktype; /* data link type (LINKTYPE_*) */
113 * Each packet in the dump file is prepended with this generic header.
114 * This gets around the problem of different headers for different
118 struct timeval ts; /* time stamp */
119 bpf_u_int32 caplen; /* length of portion present */
120 bpf_u_int32 len; /* length this packet (off wire) */
124 * As returned by the pcap_stats()
127 u_int ps_recv; /* number of packets received */
128 u_int ps_drop; /* number of packets dropped */
129 u_int ps_ifdrop; /* drops by interface XXX not yet supported */
132 typedef void (*pcap_handler)(u_char *, const struct pcap_pkthdr *,
135 char *pcap_lookupdev(char *);
136 int pcap_lookupnet(char *, bpf_u_int32 *, bpf_u_int32 *, char *);
137 pcap_t *pcap_open_live(char *, int, int, int, char *);
138 pcap_t *pcap_open_dead(int, int);
139 pcap_t *pcap_open_offline(const char *, char *);
140 void pcap_close(pcap_t *);
141 int pcap_loop(pcap_t *, int, pcap_handler, u_char *);
142 int pcap_dispatch(pcap_t *, int, pcap_handler, u_char *);
144 pcap_next(pcap_t *, struct pcap_pkthdr *);
145 int pcap_stats(pcap_t *, struct pcap_stat *);
146 int pcap_setfilter(pcap_t *, struct bpf_program *);
147 void pcap_perror(pcap_t *, char *);
148 char *pcap_strerror(int);
149 char *pcap_geterr(pcap_t *);
150 int pcap_compile(pcap_t *, struct bpf_program *, char *, int,
152 int pcap_compile_nopcap(int, int, struct bpf_program *,
153 char *, int, bpf_u_int32);
154 void pcap_freecode(struct bpf_program *);
155 int pcap_datalink(pcap_t *);
156 int pcap_snapshot(pcap_t *);
157 int pcap_is_swapped(pcap_t *);
158 int pcap_major_version(pcap_t *);
159 int pcap_minor_version(pcap_t *);
162 FILE *pcap_file(pcap_t *);
163 int pcap_fileno(pcap_t *);
165 pcap_dumper_t *pcap_dump_open(pcap_t *, const char *);
166 void pcap_dump_close(pcap_dumper_t *);
167 void pcap_dump(u_char *, const struct pcap_pkthdr *, const u_char *);
169 /* XXX this guy lives in the bpf tree */
170 u_int bpf_filter(struct bpf_insn *, u_char *, u_int, u_int);
171 int bpf_validate(struct bpf_insn *f, int len);
172 char *bpf_image(struct bpf_insn *, int);
173 void bpf_dump(struct bpf_program *, int);