aboutsummaryrefslogtreecommitdiffstats
path: root/capture-pcap-util.h
blob: 0b07e2b274dd66cc28b621d5359e05cd13ee1746 (plain)
1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38
39
40
41
42
43
44
45
46
47
48
49
50
51
52
53
54
55
56
57
58
59
60
61
62
63
64
65
66
67
68
69
70
71
72
73
74
75
76
77
78
79
80
81
82
83
84
85
86
87
88
89
90
91
92
93
94
95
96
97
98
99
100
101
102
103
104
105
106
107
108
109
110
111
112
113
114
115
116
117
118
119
120
121
122
123
124
125
126
127
128
129
130
131
132
133
134
135
136
137
138
/* capture-pcap-util.h
 * Utility definitions for packet capture
 *
 * $Id$
 *
 * Ethereal - Network traffic analyzer
 * By Gerald Combs <gerald@ethereal.com>
 * Copyright 1998 Gerald Combs
 *
 * This program is free software; you can redistribute it and/or
 * modify it under the terms of the GNU General Public License
 * as published by the Free Software Foundation; either version 2
 * of the License, or (at your option) any later version.
 *
 * This program is distributed in the hope that it will be useful,
 * but WITHOUT ANY WARRANTY; without even the implied warranty of
 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
 * GNU General Public License for more details.
 *
 * You should have received a copy of the GNU General Public License
 * along with this program; if not, write to the Free Software
 * Foundation, Inc., 59 Temple Place - Suite 330, Boston, MA  02111-1307, USA.
 */

#ifndef __PCAP_UTIL_H__
#define __PCAP_UTIL_H__

#ifdef HAVE_LIBPCAP

#ifdef __cplusplus
extern "C" {
#endif /* __cplusplus */

#include <epan/address.h>

#include <pcap.h>

/* declaration of pcap_t here, to reduce pcap dependencies */
/*typedef struct pcap pcap_t;*/


/*
 * XXX - this is also the traditional default snapshot size in
 * tcpdump - but, if IPv6 is enabled, it defaults to 96, to get an
 * IPv6 header + TCP + 22 extra bytes.
 *
 * Some libpcap versions for particular capture devices might happen
 * to impose a minimum, but it's not always 68.
 */
#define MIN_PACKET_SIZE 68	/* minimum amount of packet data we can read */

/* XXX - this must be optimized, removing the dependency!!! */
#define CAPTURE_PCAP_ERRBUF_SIZE PCAP_ERRBUF_SIZE

/*
 * The list of interfaces returned by "get_interface_list()" is
 * a list of these structures.
 */
typedef struct {
	char	*name;          /* e.g. "eth0" */
	char	*description;   /* from OS, e.g. "Local Area Connection" or NULL */
	GSList  *ip_addr;       /* containing address values of if_addr_t */
	gboolean loopback;      /* TRUE if loopback, FALSE otherwise */
} if_info_t;

/*
 * An address in the "ip_addr" list.
 */
typedef struct {
	address_type type;      /* AF_INET or AF_INET6 */
	union {
		guint32 ip4_addr;   /*  4 byte IP V4 address, or */
		guint8 ip6_addr[16];/* 16 byte IP V6 address */
	} ip_addr;
} if_addr_t;

GList *get_interface_list(int *err, char *err_str);

/* Error values from "get_interface_list()". */
#define	CANT_GET_INTERFACE_LIST	0	/* error getting list */
#define	NO_INTERFACES_FOUND	1	/* list is empty */

void free_interface_list(GList *if_list);

/*
 * Get an error message string for a CANT_GET_INTERFACE_LIST error from
 * "get_interface_list()".
 */
gchar *cant_get_if_list_error_message(const char *err_str);

/*
 * The list of data link types returned by "get_pcap_linktype_list()" is
 * a list of these structures.
 */
typedef struct {
	int	dlt;                /* e.g. DLT_EN10MB (which is 1) */
	char	*name;          /* e.g. "EN10MB" or "DLT 1" */
	char	*description;   /* descriptive name from wiretap e.g. "Ethernet", NULL if unknown */
} data_link_info_t;

GList *get_pcap_linktype_list(const char *devname, char *err_buf);
void free_pcap_linktype_list(GList *linktype_list);

/* get/set the link type of an interface */
/* (only used in capture_loop.c / capture-pcap-util.c) */
int get_pcap_linktype(pcap_t *pch, const char *devname);
const char *set_pcap_linktype(pcap_t *pch, char *devname, int dlt);


#ifdef HAVE_PCAP_DATALINK_VAL_TO_NAME
const char *linktype_val_to_name(int dlt);
#endif
#ifdef HAVE_PCAP_DATALINK_NAME_TO_VAL
int linktype_name_to_val(const char *linktype);
#endif

#ifdef __cplusplus
}
#endif /* __cplusplus */

#endif /* HAVE_LIBPCAP */

/*
 * Append to a GString an indication of the version of libpcap/WinPcap
 * with which we were compiled, if we were, or an indication that we
 * weren't compiled with libpcap/WinPcap, if we weren't.
 */
extern void get_compiled_pcap_version(GString *str);

/*
 * Append to a GString an indication of the version of libpcap/WinPcap
 * with which we're running, or an indication that we're not running
 * with libpcap/WinPcap, if we were compiled with libpcap/WinPcap,
 * or nothing, if we weren't compiled with libpcap/WinPcap.
 */
extern void get_runtime_pcap_version(GString *str);

#endif /* __PCAP_UTIL_H__ */