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-rw-r--r--nc.c137
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1/* vi: set sw=4 ts=4: */
2/* nc: mini-netcat - built from the ground up for LRP
3 Copyright (C) 1998 Charles P. Wright
4
5 0.0.1 6K It works.
6 0.0.2 5K Smaller and you can also check the exit condition if you wish.
7 0.0.3 Uses select()
8
9 19980918 Busy Boxed! Dave Cinege
10 19990512 Uses Select. Charles P. Wright
11 19990513 Fixes stdin stupidity and uses buffers. Charles P. Wright
12
13 This program is free software; you can redistribute it and/or modify
14 it under the terms of the GNU General Public License as published by
15 the Free Software Foundation; either version 2 of the License, or
16 (at your option) any later version.
17
18 This program is distributed in the hope that it will be useful,
19 but WITHOUT ANY WARRANTY; without even the implied warranty of
20 MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
21 GNU General Public License for more details.
22
23 You should have received a copy of the GNU General Public License
24 along with this program; if not, write to the Free Software
25 Foundation, Inc., 59 Temple Place - Suite 330, Boston, MA 02111-1307, USA.
26
27*/
28
29#include <stdio.h>
30#include <stdlib.h>
31#include <string.h>
32#include <unistd.h>
33
34#include <sys/types.h>
35#include <sys/socket.h>
36#include <netinet/in.h>
37#include <arpa/inet.h>
38#include <netdb.h>
39#include <sys/time.h>
40#include <sys/ioctl.h>
41#include "busybox.h"
42
43int nc_main(int argc, char **argv)
44{
45 int do_listen = 0, lport = 0, tmpfd, opt, sfd;
46 char buf[BUFSIZ];
47
48 struct sockaddr_in address;
49 struct hostent *hostinfo;
50
51 fd_set readfds, testfds;
52
53 while ((opt = getopt(argc, argv, "lp:")) > 0) {
54 switch (opt) {
55 case 'l':
56 do_listen++;
57 break;
58 case 'p':
59 lport = atoi(optarg);
60 break;
61 default:
62 show_usage();
63 }
64 }
65
66 if ((do_listen && optind != argc) || (!do_listen && optind + 2 != argc))
67 show_usage();
68
69 if ((sfd = socket(AF_INET, SOCK_STREAM, 0)) < 0)
70 perror_msg_and_die("socket");
71
72 address.sin_family = AF_INET;
73
74 if (lport != 0) {
75 memset(&address.sin_addr, 0, sizeof(address.sin_addr));
76 address.sin_port = htons(lport);
77
78 if (bind(sfd, (struct sockaddr *) &address, sizeof(address)) < 0)
79 perror_msg_and_die("bind");
80 }
81
82 if (do_listen) {
83 socklen_t addrlen = sizeof(address);
84
85 if (listen(sfd, 1) < 0)
86 perror_msg_and_die("listen");
87
88 if ((tmpfd = accept(sfd, (struct sockaddr *) &address, &addrlen)) < 0)
89 perror_msg_and_die("accept");
90
91 close(sfd);
92 sfd = tmpfd;
93 } else {
94 hostinfo = xgethostbyname(argv[optind]);
95
96 address.sin_addr = *(struct in_addr *) *hostinfo->h_addr_list;
97 address.sin_port = htons(atoi(argv[optind+1]));
98
99 if (connect(sfd, (struct sockaddr *) &address, sizeof(address)) < 0)
100 perror_msg_and_die("connect");
101 }
102
103 FD_ZERO(&readfds);
104 FD_SET(sfd, &readfds);
105 FD_SET(STDIN_FILENO, &readfds);
106
107 while (1) {
108 int fd;
109 int ofd;
110 int nread;
111
112 testfds = readfds;
113
114 if (select(FD_SETSIZE, &testfds, NULL, NULL, NULL) < 0)
115 perror_msg_and_die("select");
116
117 for (fd = 0; fd < FD_SETSIZE; fd++) {
118 if (FD_ISSET(fd, &testfds)) {
119 if ((nread = safe_read(fd, buf, sizeof(buf))) < 0)
120 perror_msg_and_die("read");
121
122 if (fd == sfd) {
123 if (nread == 0)
124 exit(0);
125 ofd = STDOUT_FILENO;
126 } else {
127 if (nread == 0)
128 shutdown(sfd, 1);
129 ofd = sfd;
130 }
131
132 if (full_write(ofd, buf, nread) < 0)
133 perror_msg_and_die("write");
134 }
135 }
136 }
137}