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
156
157
158
159
160
161
162
163
164
165
166
167
168
169
170
171
172
173
174
175
176
177
178
179
180
181
182
183
184
185
186
187
188
189
190
191
192
193
194
195
196
197
198
199
200
201
202
203
204
205
206
207
208
209
210
211
212
213
214
215
216
217
218
219
220
221
222
223
224
225
226
227
228
229
230
231
232
233
234
235
236
237
238
|
/*
* main.c
*
* Copyright (c) 1996-1999 Whistle Communications, Inc.
* All rights reserved.
*
* Subject to the following obligations and disclaimer of warranty, use and
* redistribution of this software, in source or object code forms, with or
* without modifications are expressly permitted by Whistle Communications;
* provided, however, that:
* 1. Any and all reproductions of the source or object code must include the
* copyright notice above and the following disclaimer of warranties; and
* 2. No rights are granted, in any manner or form, to use Whistle
* Communications, Inc. trademarks, including the mark "WHISTLE
* COMMUNICATIONS" on advertising, endorsements, or otherwise except as
* such appears in the above copyright notice or in the software.
*
* THIS SOFTWARE IS BEING PROVIDED BY WHISTLE COMMUNICATIONS "AS IS", AND
* TO THE MAXIMUM EXTENT PERMITTED BY LAW, WHISTLE COMMUNICATIONS MAKES NO
* REPRESENTATIONS OR WARRANTIES, EXPRESS OR IMPLIED, REGARDING THIS SOFTWARE,
* INCLUDING WITHOUT LIMITATION, ANY AND ALL IMPLIED WARRANTIES OF
* MERCHANTABILITY, FITNESS FOR A PARTICULAR PURPOSE, OR NON-INFRINGEMENT.
* WHISTLE COMMUNICATIONS DOES NOT WARRANT, GUARANTEE, OR MAKE ANY
* REPRESENTATIONS REGARDING THE USE OF, OR THE RESULTS OF THE USE OF THIS
* SOFTWARE IN TERMS OF ITS CORRECTNESS, ACCURACY, RELIABILITY OR OTHERWISE.
* IN NO EVENT SHALL WHISTLE COMMUNICATIONS BE LIABLE FOR ANY DAMAGES
* RESULTING FROM OR ARISING OUT OF ANY USE OF THIS SOFTWARE, INCLUDING
* WITHOUT LIMITATION, ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY,
* PUNITIVE, OR CONSEQUENTIAL DAMAGES, PROCUREMENT OF SUBSTITUTE GOODS OR
* SERVICES, LOSS OF USE, DATA OR PROFITS, HOWEVER CAUSED AND UNDER ANY
* THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
* (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF
* THIS SOFTWARE, EVEN IF WHISTLE COMMUNICATIONS IS ADVISED OF THE POSSIBILITY
* OF SUCH DAMAGE.
*
* $FreeBSD$
* $Whistle: main.c,v 1.9 1999/01/20 00:26:26 archie Exp $
*/
#include <stdio.h>
#include <stdlib.h>
#include <string.h>
#include <ctype.h>
#include <unistd.h>
#include <sysexits.h>
#include <errno.h>
#include <err.h>
#include <sys/types.h>
#include <sys/socket.h>
#include <sys/select.h>
#include <netgraph.h>
#define DEFAULT_HOOKNAME "debug"
#define NG_SOCK_HOOK_NAME "hook"
#define BUF_SIZE (64 * 1024)
static void WriteAscii(u_char * buf, int len);
static void Usage(void);
/*
* main()
*/
int
main(int ac, char *av[])
{
struct ngm_connect ngc;
char *path = NULL, *hook = DEFAULT_HOOKNAME;
int csock, dsock;
int asciiFlag = 0;
int loopFlag = 0;
int noInput = 0;
int ch;
/* Parse flags */
while ((ch = getopt(ac, av, "adln")) != EOF) {
switch (ch) {
case 'a':
asciiFlag = 1;
break;
case 'd':
NgSetDebug(NgSetDebug(-1) + 1);
break;
case 'l':
loopFlag = 1;
break;
case 'n':
noInput = 1;
break;
case '?':
default:
Usage();
}
}
ac -= optind;
av += optind;
/* Get params */
switch (ac) {
case 2:
hook = av[1];
/* FALLTHROUGH */
case 1:
path = av[0];
break;
default:
Usage();
}
/* Get sockets */
if (NgMkSockNode(NULL, &csock, &dsock) < 0)
errx(EX_OSERR, "can't get sockets");
/* Connect socket node to specified node */
snprintf(ngc.path, sizeof(ngc.path), "%s", path);
snprintf(ngc.ourhook, sizeof(ngc.ourhook), NG_SOCK_HOOK_NAME);
snprintf(ngc.peerhook, sizeof(ngc.peerhook), "%s", hook);
if (NgSendMsg(csock, ".",
NGM_GENERIC_COOKIE, NGM_CONNECT, &ngc, sizeof(ngc)) < 0)
errx(EX_OSERR, "can't connect to node");
/* Close standard input if not reading from it */
if (noInput)
fclose(stdin);
/* Relay data */
while (1) {
fd_set rfds;
/* Setup bits */
FD_ZERO(&rfds);
if (!noInput)
FD_SET(0, &rfds);
FD_SET(dsock, &rfds);
/* Wait for something to happen */
if (select(FD_SETSIZE, &rfds, NULL, NULL, NULL) < 0)
err(EX_OSERR, "select");
/* Check data from socket */
if (FD_ISSET(dsock, &rfds)) {
char buf[BUF_SIZE];
int rl, wl;
/* Read packet from socket */
if ((rl = NgRecvData(dsock,
buf, sizeof(buf), NULL)) < 0)
err(EX_OSERR, "read(hook)");
if (rl == 0)
errx(EX_OSERR, "read EOF from hook?!");
/* Write packet to stdout */
if (asciiFlag)
WriteAscii((u_char *) buf, rl);
else if ((wl = write(STDOUT_FILENO, buf, rl)) != rl) {
if (wl < 0) {
err(EX_OSERR, "write(stdout)");
} else {
errx(EX_OSERR,
"stdout: read %d, wrote %d",
rl, wl);
}
}
/* Loopback */
if (loopFlag) {
if (NgSendData(dsock, NG_SOCK_HOOK_NAME, buf, rl) < 0)
err(EX_OSERR, "write(hook)");
}
}
/* Check data from stdin */
if (FD_ISSET(0, &rfds)) {
char buf[BUF_SIZE];
int rl;
/* Read packet from stdin */
if ((rl = read(0, buf, sizeof(buf))) < 0)
err(EX_OSERR, "read(stdin)");
if (rl == 0)
errx(EX_OSERR, "EOF(stdin)");
/* Write packet to socket */
if (NgSendData(dsock, NG_SOCK_HOOK_NAME, buf, rl) < 0)
err(EX_OSERR, "write(hook)");
}
}
}
/*
* Dump data in hex and ASCII form
*/
static void
WriteAscii(u_char *buf, int len)
{
char ch, sbuf[100];
int k, count;
for (count = 0; count < len; count += 16) {
snprintf(sbuf, sizeof(sbuf), "%04x: ", count);
for (k = 0; k < 16; k++)
if (count + k < len)
snprintf(sbuf + strlen(sbuf),
sizeof(sbuf) - strlen(sbuf),
"%02x ", buf[count + k]);
else
snprintf(sbuf + strlen(sbuf),
sizeof(sbuf) - strlen(sbuf), " ");
snprintf(sbuf + strlen(sbuf), sizeof(sbuf) - strlen(sbuf), " ");
for (k = 0; k < 16; k++)
if (count + k < len) {
ch = isprint(buf[count + k]) ?
buf[count + k] : '.';
snprintf(sbuf + strlen(sbuf),
sizeof(sbuf) - strlen(sbuf), "%c", ch);
} else
snprintf(sbuf + strlen(sbuf),
sizeof(sbuf) - strlen(sbuf), " ");
snprintf(sbuf + strlen(sbuf),
sizeof(sbuf) - strlen(sbuf), "\n");
(void) write(STDOUT_FILENO, sbuf, strlen(sbuf));
}
ch = '\n';
write(1, &ch, 1);
}
/*
* Display usage and exit
*/
static void
Usage(void)
{
errx(EX_USAGE, "usage: nghook [-adln] path [hookname]");
}
|
