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-rw-r--r--nc.c133
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+/* vi: set sw=4 ts=4: */
+/* nc: 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.
+ 0.0.3 Uses select()
+
+ 19980918 Busy Boxed! Dave Cinege
+ 19990512 Uses Select. Charles P. Wright
+ 19990513 Fixes stdin stupidity and uses buffers. Charles P. Wright
+
+ 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>
+
+#define BUFSIZE 100
+
+static const char nc_usage[] = "nc [IP] [port]\n"
+#ifndef BB_FEATURE_TRIVIAL_HELP
+ "\nNetcat opens a pipe to IP:port\n"
+#endif
+ ;
+
+int nc_main(int argc, char **argv)
+{
+ int sfd;
+ int result;
+ int len;
+ char ch[BUFSIZE];
+
+ struct sockaddr_in address;
+ struct hostent *hostinfo;
+
+ fd_set readfds, testfds;
+
+ argc--;
+ argv++;
+ if (argc < 2 || **(argv + 1) == '-') {
+ usage(nc_usage);
+ }
+
+ sfd = socket(AF_INET, SOCK_STREAM, 0);
+
+ hostinfo = (struct hostent *) gethostbyname(*argv);
+
+ 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)));
+
+ len = sizeof(address);
+
+ result = connect(sfd, (struct sockaddr *) &address, len);
+
+ if (result < 0) {
+ exit(2);
+ }
+
+ FD_ZERO(&readfds);
+ FD_SET(sfd, &readfds);
+ FD_SET(fileno(stdin), &readfds);
+
+ while (1) {
+ int fd;
+ int ofd;
+ 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)) {
+ int trn = 0;
+ int rn;
+
+ ioctl(fd, FIONREAD, &nread);
+
+ if (fd == sfd) {
+ if (nread == 0)
+ exit(0);
+ ofd = fileno(stdout);
+ } else {
+ ofd = sfd;
+ }
+
+
+
+ do {
+ rn = (BUFSIZE < nread - trn) ? BUFSIZE : nread - trn;
+ trn += rn;
+ read(fd, ch, rn);
+ write(ofd, ch, rn);
+ }
+ while (trn < nread);
+ }
+ }
+ }
+}