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
139
140
141
142
143
144
145
146
147
148
149
150
151
152
153
154
155
|
/*
This file is part of Kismet
Kismet 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.
Kismet 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 Kismet; if not, write to the Free Software
Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA 02111-1307 USA
*/
#include "config.h"
#include <stdio.h>
#include <errno.h>
#include <sys/types.h>
#include <sys/stat.h>
#include <fcntl.h>
#include <unistd.h>
#include "fifodump.h"
int FifoDumpFile::OpenDump(const char *file) {
snprintf(type, 64, "FIFO packet dump");
snprintf(filename, 1024, "%s", file);
num_dumped = 0;
struct stat filestat;
// See if it exists and it's a pipe already
if (stat(file, &filestat) != -1) {
if (!S_ISFIFO(filestat.st_mode)) {
snprintf(errstr, 1024, "%s already exists and isn't a pipe.", file);
return -1;
}
} else if (mknod(file, 0644 | S_IFIFO, 0) < 0) {
snprintf(errstr, 1024, "Couldn't create pipe %s: %s", file, strerror(errno));
return -1;
}
// This will now block until something is reading from the pipe.
if ((dump_file = fopen(file, "w")) == NULL) {
snprintf(errstr, 1024, "Couldn't open pipe %s for writing: %s", file, strerror(errno));
return -1;
}
uint32_t magic = PCAP_MAGIC;
int nwritten;
// Write the magic file identifier
nwritten = fwrite(&magic, 1, sizeof(magic), dump_file);
if (nwritten != sizeof(magic)) {
if (nwritten == 0 && ferror(dump_file))
snprintf(errstr, 1024, "Unable to write pcap magic header. (%s)", strerror(errno));
else
snprintf(errstr, 1024, "Short write on pcap magic header.");
return -1;
}
pcap_hdr file_hdr;
/* current "libpcap" format is 2.4 */
file_hdr.version_major = 2;
file_hdr.version_minor = 4;
file_hdr.thiszone = 0; /* XXX - current offset? */
file_hdr.sigfigs = 0; /* unknown, but also apparently unused */
file_hdr.snaplen = 2344;
file_hdr.network = 105; /* pcap file type */
// Write the header
nwritten = fwrite(&file_hdr, 1, sizeof(file_hdr), dump_file);
if (nwritten != sizeof(file_hdr)) {
if (nwritten == 0 && ferror(dump_file))
snprintf(errstr, 1024, "Unable to write pcap file header. (%s)", strerror(errno));
else
snprintf(errstr, 1024, "Short write on pcap file header.");
return -1;
}
// Flush. Always. Otherwise the FILE* stuff gets buffered and makes the pipe
// cranky.
fflush(dump_file);
return 1;
}
int FifoDumpFile::CloseDump() {
fclose(dump_file);
return num_dumped;
}
int FifoDumpFile::DumpPacket(const packet_info *in_info, const kis_packet *packet) {
/*
if (in_info->type != packet_data)
return 0;
*/
kis_packet *dump_packet;
// Mangle decrypted and fuzzy packets into legit packets
if (MangleDeCryptPacket(packet, in_info, &mangle_packet,
mangle_data, mangle_moddata) > 0)
dump_packet = &mangle_packet;
else if (MangleFuzzyCryptPacket(packet, in_info, &mangle_packet,
mangle_data, mangle_moddata) > 0)
dump_packet = &mangle_packet;
else
dump_packet = (kis_packet *) packet;
pcaprec_hdr packhdr;
unsigned int nwritten;
// Convert it to a pcap header
packhdr.ts_sec = dump_packet->ts.tv_sec;
packhdr.ts_usec = dump_packet->ts.tv_usec;
packhdr.incl_len = dump_packet->caplen;
packhdr.orig_len = dump_packet->caplen;
nwritten = fwrite(&packhdr, 1, sizeof(pcaprec_hdr), dump_file);
if (nwritten != sizeof(pcaprec_hdr)) {
if (nwritten == 0 && ferror(dump_file))
snprintf(errstr, 1024, "Unable to write pcap packet header (%s)", strerror(errno));
else
snprintf(errstr, 1024, "Short write on pcap packet header");
return -1;
}
nwritten = fwrite(dump_packet->data, 1, packhdr.incl_len, dump_file);
if (nwritten != packhdr.incl_len) {
if (nwritten == 0 && ferror(dump_file))
snprintf(errstr, 1024, "Unable to write pcap packet (%s)", strerror(errno));
else
snprintf(errstr, 1024, "Short write on pcap packet");
return -1;
}
num_dumped++;
fflush(dump_file);
return 1;
}
|
