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35 * @(#) $Header: /tcpdump/master/libpcap/pcap.h,v 1.45.2.4 2004/01/27 22:56:20 guy Exp $ (LBL)
41 #include <sys/types.h>
52 #define PCAP_VERSION_MAJOR 2
53 #define PCAP_VERSION_MINOR 4
55 #define PCAP_ERRBUF_SIZE 256
58 * Compatibility for systems that have a bpf.h that
59 * predates the bpf typedefs for 64-bit support.
61 #if BPF_RELEASE - 0 < 199406
62 typedef int bpf_int32;
63 typedef u_int bpf_u_int32;
66 typedef struct pcap pcap_t;
67 typedef struct pcap_dumper pcap_dumper_t;
68 typedef struct pcap_if pcap_if_t;
69 typedef struct pcap_addr pcap_addr_t;
72 * The first record in the file contains saved values for some
73 * of the flags used in the printout phases of tcpdump.
74 * Many fields here are 32 bit ints so compilers won't insert unwanted
75 * padding; these files need to be interchangeable across architectures.
77 * Do not change the layout of this structure, in any way (this includes
78 * changes that only affect the length of fields in this structure).
80 * Also, do not change the interpretation of any of the members of this
81 * structure, in any way (this includes using values other than
82 * LINKTYPE_ values, as defined in "savefile.c", in the "linktype"
87 * introduce a new structure for the new format, if the layout
88 * of the structure changed;
90 * send mail to "tcpdump-workers@tcpdump.org", requesting a new
91 * magic number for your new capture file format, and, when
92 * you get the new magic number, put it in "savefile.c";
94 * use that magic number for save files with the changed file
97 * make the code in "savefile.c" capable of reading files with
98 * the old file header as well as files with the new file header
99 * (using the magic number to determine the header format).
101 * Then supply the changes to "patches@tcpdump.org", so that future
102 * versions of libpcap and programs that use it (such as tcpdump) will
103 * be able to read your new capture file format.
105 struct pcap_file_header {
107 u_short version_major;
108 u_short version_minor;
109 bpf_int32 thiszone; /* gmt to local correction */
110 bpf_u_int32 sigfigs; /* accuracy of timestamps */
111 bpf_u_int32 snaplen; /* max length saved portion of each pkt */
112 bpf_u_int32 linktype; /* data link type (LINKTYPE_*) */
116 * Each packet in the dump file is prepended with this generic header.
117 * This gets around the problem of different headers for different
121 struct timeval ts; /* time stamp */
122 bpf_u_int32 caplen; /* length of portion present */
123 bpf_u_int32 len; /* length this packet (off wire) */
127 * As returned by the pcap_stats()
130 u_int ps_recv; /* number of packets received */
131 u_int ps_drop; /* number of packets dropped */
132 u_int ps_ifdrop; /* drops by interface XXX not yet supported */
134 u_int bs_capt; /* number of packets that reach the application */
139 * Item in a list of interfaces.
142 struct pcap_if *next;
143 char *name; /* name to hand to "pcap_open_live()" */
144 char *description; /* textual description of interface, or NULL */
145 struct pcap_addr *addresses;
146 bpf_u_int32 flags; /* PCAP_IF_ interface flags */
149 #define PCAP_IF_LOOPBACK 0x00000001 /* interface is loopback */
152 * Representation of an interface address.
155 struct pcap_addr *next;
156 struct sockaddr *addr; /* address */
157 struct sockaddr *netmask; /* netmask for that address */
158 struct sockaddr *broadaddr; /* broadcast address for that address */
159 struct sockaddr *dstaddr; /* P2P destination address for that address */
162 typedef void (*pcap_handler)(u_char *, const struct pcap_pkthdr *,
165 char *pcap_lookupdev(char *);
166 int pcap_lookupnet(const char *, bpf_u_int32 *, bpf_u_int32 *, char *);
167 pcap_t *pcap_open_live(const char *, int, int, int, char *);
168 pcap_t *pcap_open_dead(int, int);
169 pcap_t *pcap_open_offline(const char *, char *);
170 void pcap_close(pcap_t *);
171 int pcap_loop(pcap_t *, int, pcap_handler, u_char *);
172 int pcap_dispatch(pcap_t *, int, pcap_handler, u_char *);
174 pcap_next(pcap_t *, struct pcap_pkthdr *);
175 int pcap_next_ex(pcap_t *, struct pcap_pkthdr **, const u_char **);
176 void pcap_breakloop(pcap_t *);
177 int pcap_stats(pcap_t *, struct pcap_stat *);
178 int pcap_setfilter(pcap_t *, struct bpf_program *);
179 int pcap_getnonblock(pcap_t *, char *);
180 int pcap_setnonblock(pcap_t *, int, char *);
181 void pcap_perror(pcap_t *, char *);
182 char *pcap_strerror(int);
183 char *pcap_geterr(pcap_t *);
184 int pcap_compile(pcap_t *, struct bpf_program *, char *, int,
186 int pcap_compile_nopcap(int, int, struct bpf_program *,
187 char *, int, bpf_u_int32);
188 void pcap_freecode(struct bpf_program *);
189 int pcap_datalink(pcap_t *);
190 int pcap_list_datalinks(pcap_t *, int **);
191 int pcap_set_datalink(pcap_t *, int);
192 int pcap_datalink_name_to_val(const char *);
193 const char *pcap_datalink_val_to_name(int);
194 const char *pcap_datalink_val_to_description(int);
195 int pcap_snapshot(pcap_t *);
196 int pcap_is_swapped(pcap_t *);
197 int pcap_major_version(pcap_t *);
198 int pcap_minor_version(pcap_t *);
201 FILE *pcap_file(pcap_t *);
202 int pcap_fileno(pcap_t *);
204 pcap_dumper_t *pcap_dump_open(pcap_t *, const char *);
205 int pcap_dump_flush(pcap_dumper_t *);
206 void pcap_dump_close(pcap_dumper_t *);
207 void pcap_dump(u_char *, const struct pcap_pkthdr *, const u_char *);
208 FILE *pcap_dump_file(pcap_dumper_t *);
210 int pcap_findalldevs(pcap_if_t **, char *);
211 void pcap_freealldevs(pcap_if_t *);
213 const char *pcap_lib_version(void);
215 /* XXX this guy lives in the bpf tree */
216 u_int bpf_filter(struct bpf_insn *, u_char *, u_int, u_int);
217 int bpf_validate(struct bpf_insn *f, int len);
218 char *bpf_image(struct bpf_insn *, int);
219 void bpf_dump(struct bpf_program *, int);
226 int pcap_setbuff(pcap_t *p, int dim);
227 int pcap_setmode(pcap_t *p, int mode);
228 int pcap_sendpacket(pcap_t *p, u_char *buf, int size);
229 int pcap_setmintocopy(pcap_t *p, int size);
232 /* Include file with the wpcap-specific extensions */
233 #include <Win32-Extensions.h>
245 int pcap_get_selectable_fd(pcap_t *);