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https://github.com/topjohnwu/ndk-busybox.git
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afeb683459
exit(). Note that calling perror() after gethostbyname() will most likely return "No such file or directory" which is quite confusing, so I decided to use fatalError instead. Regards, Pavel Roskin
136 lines
2.9 KiB
C
136 lines
2.9 KiB
C
/* vi: set sw=4 ts=4: */
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/* nc: mini-netcat - built from the ground up for LRP
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Copyright (C) 1998 Charles P. Wright
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0.0.1 6K It works.
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0.0.2 5K Smaller and you can also check the exit condition if you wish.
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0.0.3 Uses select()
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19980918 Busy Boxed! Dave Cinege
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19990512 Uses Select. Charles P. Wright
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19990513 Fixes stdin stupidity and uses buffers. Charles P. Wright
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This program is free software; you can redistribute it and/or modify
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it under the terms of the GNU General Public License as published by
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the Free Software Foundation; either version 2 of the License, or
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(at your option) any later version.
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This program is distributed in the hope that it will be useful,
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but WITHOUT ANY WARRANTY; without even the implied warranty of
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MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
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GNU General Public License for more details.
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You should have received a copy of the GNU General Public License
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along with this program; if not, write to the Free Software
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Foundation, Inc., 59 Temple Place - Suite 330, Boston, MA 02111-1307, USA.
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*/
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#include "internal.h"
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#include <stdio.h>
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#include <stdlib.h>
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#include <unistd.h>
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#include <sys/types.h>
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#include <sys/socket.h>
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#include <netinet/in.h>
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#include <arpa/inet.h>
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#include <netdb.h>
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#include <sys/time.h>
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#include <sys/ioctl.h>
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#define BUFSIZE 100
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static const char nc_usage[] = "nc [IP] [port]\n"
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#ifndef BB_FEATURE_TRIVIAL_HELP
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"\nNetcat opens a pipe to IP:port\n"
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#endif
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;
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int nc_main(int argc, char **argv)
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{
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int sfd;
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int result;
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int len;
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char ch[BUFSIZE];
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struct sockaddr_in address;
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struct hostent *hostinfo;
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fd_set readfds, testfds;
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argc--;
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argv++;
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if (argc < 2 || **(argv + 1) == '-') {
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usage(nc_usage);
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}
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sfd = socket(AF_INET, SOCK_STREAM, 0);
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hostinfo = (struct hostent *) gethostbyname(*argv);
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if (!hostinfo) {
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fatalError("nc: cannot resolve %s\n", *argv);
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}
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address.sin_family = AF_INET;
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address.sin_addr = *(struct in_addr *) *hostinfo->h_addr_list;
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address.sin_port = htons(atoi(*(++argv)));
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len = sizeof(address);
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result = connect(sfd, (struct sockaddr *) &address, len);
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if (result < 0) {
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perror("nc: connect");
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exit(2);
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}
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FD_ZERO(&readfds);
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FD_SET(sfd, &readfds);
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FD_SET(fileno(stdin), &readfds);
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while (1) {
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int fd;
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int ofd;
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int nread;
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testfds = readfds;
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result =
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select(FD_SETSIZE, &testfds, (fd_set *) NULL, (fd_set *) NULL,
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(struct timeval *) 0);
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if (result < 1) {
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perror("nc: select");
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exit(3);
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}
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for (fd = 0; fd < FD_SETSIZE; fd++) {
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if (FD_ISSET(fd, &testfds)) {
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int trn = 0;
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int rn;
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ioctl(fd, FIONREAD, &nread);
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if (fd == sfd) {
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if (nread == 0)
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exit(0);
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ofd = fileno(stdout);
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} else {
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ofd = sfd;
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}
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do {
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rn = (BUFSIZE < nread - trn) ? BUFSIZE : nread - trn;
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trn += rn;
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read(fd, ch, rn);
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write(ofd, ch, rn);
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}
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while (trn < nread);
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}
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}
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}
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}
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