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
6 0.0.2 5K Smaller and you can also check the exit condition if you wish.
9 19980918 Busy Boxed! Dave Cinege
10 19990512 Uses Select. Charles P. Wright
11 19990513 Fixes stdin stupidity and uses buffers. Charles P. Wright
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.
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.
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.
33 #include <sys/types.h>
34 #include <sys/socket.h>
35 #include <netinet/in.h>
36 #include <arpa/inet.h>
39 #include <sys/ioctl.h>
42 int nc_main(int argc, char **argv)
44 int do_listen = 0, lport = 0, tmpfd, opt, sfd;
47 struct sockaddr_in address;
48 struct hostent *hostinfo;
50 fd_set readfds, testfds;
52 while ((opt = getopt(argc, argv, "lp:")) > 0) {
65 if ((do_listen && optind != argc) || (!do_listen && optind + 2 != argc))
68 if ((sfd = socket(AF_INET, SOCK_STREAM, 0)) < 0)
69 perror_msg_and_die("socket");
71 address.sin_family = AF_INET;
74 memset(&address.sin_addr, 0, sizeof(address.sin_addr));
75 address.sin_port = htons(lport);
77 if (bind(sfd, (struct sockaddr *) &address, sizeof(address)) < 0)
78 perror_msg_and_die("bind");
82 if (listen(sfd, 1) < 0)
83 perror_msg_and_die("listen");
85 if ((tmpfd = accept(sfd, (struct sockaddr *) &address, &opt)) < 0)
86 perror_msg_and_die("accept");
91 if ((hostinfo = gethostbyname(argv[optind])) == NULL)
92 error_msg_and_die("cannot resolve %s\n", argv[optind]);
94 address.sin_addr = *(struct in_addr *) *hostinfo->h_addr_list;
95 address.sin_port = htons(atoi(argv[optind+1]));
97 if (connect(sfd, (struct sockaddr *) &address, sizeof(address)) < 0)
98 perror_msg_and_die("connect");
102 FD_SET(sfd, &readfds);
103 FD_SET(STDIN_FILENO, &readfds);
112 if (select(FD_SETSIZE, &testfds, NULL, NULL, NULL) < 0)
113 perror_msg_and_die("select");
115 for (fd = 0; fd < FD_SETSIZE; fd++) {
116 if (FD_ISSET(fd, &testfds)) {
117 if ((nread = safe_read(fd, buf, sizeof(buf))) < 0)
118 perror_msg_and_die("read");
130 if (full_write(ofd, buf, nread) < 0)
131 perror_msg_and_die("write");