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-rw-r--r--mnc.c148
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1/* mnc: mini-netcat - built from the ground up for LRP
2 Copyright (C) 1998 Charles P. Wright
3
4 0.0.1 6K It works.
5 0.0.2 5K Smaller and you can also check the exit condition if you wish.
6
7
8 19980918 Busy Boxed! Dave Cinege
9
10 This program is free software; you can redistribute it and/or modify
11 it under the terms of the GNU General Public License as published by
12 the Free Software Foundation; either version 2 of the License, or
13 (at your option) any later version.
14
15 This program is distributed in the hope that it will be useful,
16 but WITHOUT ANY WARRANTY; without even the implied warranty of
17 MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
18 GNU General Public License for more details.
19
20 You should have received a copy of the GNU General Public License
21 along with this program; if not, write to the Free Software
22 Foundation, Inc., 59 Temple Place - Suite 330, Boston, MA 02111-1307, USA.
23
24*/
25#include "internal.h"
26#include <stdio.h>
27#include <stdlib.h>
28#include <unistd.h>
29
30#include <sys/types.h>
31#include <sys/socket.h>
32#include <netinet/in.h>
33#include <arpa/inet.h>
34#include <netdb.h>
35#include <sys/time.h>
36#include <sys/ioctl.h>
37
38const char mnc_usage[] =
39"mini-netcat 0.0.1 -- Open pipe to IP:port\n"
40"\tmnc [IP] [port]\n";
41
42int
43mnc_main(struct FileInfo * i, int argc, char **argv)
44{
45
46 int sfd;
47 int result;
48 int len;
49 int pid;
50 char ch;
51
52 struct sockaddr_in address;
53 struct hostent *hostinfo;
54
55#ifdef SELECT
56 fd_set readfds, testfds;
57#endif
58
59 sfd = socket(AF_INET, SOCK_STREAM, 0);
60
61 hostinfo = (struct hostent *) gethostbyname(argv[1]);
62
63 if (!hostinfo)
64 {
65 exit(1);
66 }
67
68 address.sin_family = AF_INET;
69 address.sin_addr = *(struct in_addr *) *hostinfo->h_addr_list;
70 address.sin_port = htons(atoi(argv[2]));
71
72 len = sizeof(address);
73
74 result = connect(sfd, (struct sockaddr *)&address, len);
75
76 if (result < 0)
77 {
78 exit(2);
79 }
80
81#ifdef SELECT
82 FD_ZERO(&readfds);
83 FD_SET(sfd, &readfds);
84 FD_SET(fileno(stdin), &readfds);
85
86 while(1)
87 {
88 int fd;
89 int nread;
90
91 testfds = readfds;
92
93 result = select(FD_SETSIZE, &testfds, (fd_set *) NULL, (fd_set *) NULL, (struct timeval *) 0);
94
95 if(result < 1)
96 {
97 exit(3);
98 }
99
100 for(fd = 0; fd < FD_SETSIZE; fd++)
101 {
102 if(FD_ISSET(fd,&testfds))
103 {
104 ioctl(fd, FIONREAD, &nread);
105
106 if (nread == 0)
107 exit(0);
108
109 if(fd == sfd)
110 {
111 read(sfd, &ch, 1);
112 write(fileno(stdout), &ch, 1);
113 }
114 else
115 {
116 read(fileno(stdin), &ch, 1);
117 write(sfd, &ch, 1);
118 }
119 }
120 }
121 }
122#else
123 pid = fork();
124
125 if (!pid)
126 {
127 int retval;
128 retval = 1;
129 while(retval == 1)
130 {
131 retval = read(fileno(stdin), &ch, 1);
132 write(sfd, &ch, 1);
133 }
134 }
135 else
136 {
137 int retval;
138 retval = 1;
139 while(retval == 1)
140 {
141 retval = read(sfd, &ch, 1);
142 write(fileno(stdout), &ch, 1);
143 }
144 }
145
146 exit(0);
147#endif
148}