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>
43 static const char nc_usage[] = "nc [IP] [port]\n"
44 #ifndef BB_FEATURE_TRIVIAL_HELP
45 "\nNetcat opens a pipe to IP:port\n"
49 int nc_main(int argc, char **argv)
56 struct sockaddr_in address;
57 struct hostent *hostinfo;
59 fd_set readfds, testfds;
63 if (argc < 2 || **(argv + 1) == '-') {
67 sfd = socket(AF_INET, SOCK_STREAM, 0);
69 hostinfo = (struct hostent *) gethostbyname(*argv);
75 address.sin_family = AF_INET;
76 address.sin_addr = *(struct in_addr *) *hostinfo->h_addr_list;
77 address.sin_port = htons(atoi(*(++argv)));
79 len = sizeof(address);
81 result = connect(sfd, (struct sockaddr *) &address, len);
88 FD_SET(sfd, &readfds);
89 FD_SET(fileno(stdin), &readfds);
99 select(FD_SETSIZE, &testfds, (fd_set *) NULL, (fd_set *) NULL,
100 (struct timeval *) 0);
106 for (fd = 0; fd < FD_SETSIZE; fd++) {
107 if (FD_ISSET(fd, &testfds)) {
111 ioctl(fd, FIONREAD, &nread);
116 ofd = fileno(stdout);
124 rn = (BUFSIZE < nread - trn) ? BUFSIZE : nread - trn;