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
|
/* mnc: mini-netcat - built from the ground up for LRP
Copyright (C) 1998 Charles P. Wright
0.0.1 6K It works.
0.0.2 5K Smaller and you can also check the exit condition if you wish.
19980918 Busy Boxed! Dave Cinege
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.
*/
#include "internal.h"
#include <stdio.h>
#include <stdlib.h>
#include <unistd.h>
#include <sys/types.h>
#include <sys/socket.h>
#include <netinet/in.h>
#include <arpa/inet.h>
#include <netdb.h>
#include <sys/time.h>
#include <sys/ioctl.h>
const char mnc_usage[] =
"mini-netcat 0.0.1 -- Open pipe to IP:port\n"
"\tmnc [IP] [port]\n";
int
mnc_main(struct FileInfo * i, int argc, char **argv)
{
int sfd;
int result;
int len;
int pid;
char ch;
struct sockaddr_in address;
struct hostent *hostinfo;
#ifdef SELECT
fd_set readfds, testfds;
#endif
sfd = socket(AF_INET, SOCK_STREAM, 0);
hostinfo = (struct hostent *) gethostbyname(argv[1]);
if (!hostinfo)
{
exit(1);
}
address.sin_family = AF_INET;
address.sin_addr = *(struct in_addr *) *hostinfo->h_addr_list;
address.sin_port = htons(atoi(argv[2]));
len = sizeof(address);
result = connect(sfd, (struct sockaddr *)&address, len);
if (result < 0)
{
exit(2);
}
#ifdef SELECT
FD_ZERO(&readfds);
FD_SET(sfd, &readfds);
FD_SET(fileno(stdin), &readfds);
while(1)
{
int fd;
int nread;
testfds = readfds;
result = select(FD_SETSIZE, &testfds, (fd_set *) NULL, (fd_set *) NULL, (struct timeval *) 0);
if(result < 1)
{
exit(3);
}
for(fd = 0; fd < FD_SETSIZE; fd++)
{
if(FD_ISSET(fd,&testfds))
{
ioctl(fd, FIONREAD, &nread);
if (nread == 0)
exit(0);
if(fd == sfd)
{
read(sfd, &ch, 1);
write(fileno(stdout), &ch, 1);
}
else
{
read(fileno(stdin), &ch, 1);
write(sfd, &ch, 1);
}
}
}
}
#else
pid = fork();
if (!pid)
{
int retval;
retval = 1;
while(retval == 1)
{
retval = read(fileno(stdin), &ch, 1);
write(sfd, &ch, 1);
}
}
else
{
int retval;
retval = 1;
while(retval == 1)
{
retval = read(sfd, &ch, 1);
write(fileno(stdout), &ch, 1);
}
}
exit(0);
#endif
}
|
