diff options
Diffstat (limited to 'nc.c')
| -rw-r--r-- | nc.c | 137 |
1 files changed, 0 insertions, 137 deletions
@@ -1,137 +0,0 @@ -/* 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 <stdio.h> -#include <stdlib.h> -#include <string.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> -#include "busybox.h" - -int nc_main(int argc, char **argv) -{ - int do_listen = 0, lport = 0, tmpfd, opt, sfd; - char buf[BUFSIZ]; - - struct sockaddr_in address; - struct hostent *hostinfo; - - fd_set readfds, testfds; - - while ((opt = getopt(argc, argv, "lp:")) > 0) { - switch (opt) { - case 'l': - do_listen++; - break; - case 'p': - lport = atoi(optarg); - break; - default: - show_usage(); - } - } - - if ((do_listen && optind != argc) || (!do_listen && optind + 2 != argc)) - show_usage(); - - if ((sfd = socket(AF_INET, SOCK_STREAM, 0)) < 0) - perror_msg_and_die("socket"); - - address.sin_family = AF_INET; - - if (lport != 0) { - memset(&address.sin_addr, 0, sizeof(address.sin_addr)); - address.sin_port = htons(lport); - - if (bind(sfd, (struct sockaddr *) &address, sizeof(address)) < 0) - perror_msg_and_die("bind"); - } - - if (do_listen) { - socklen_t addrlen = sizeof(address); - - if (listen(sfd, 1) < 0) - perror_msg_and_die("listen"); - - if ((tmpfd = accept(sfd, (struct sockaddr *) &address, &addrlen)) < 0) - perror_msg_and_die("accept"); - - close(sfd); - sfd = tmpfd; - } else { - hostinfo = xgethostbyname(argv[optind]); - - address.sin_addr = *(struct in_addr *) *hostinfo->h_addr_list; - address.sin_port = htons(atoi(argv[optind+1])); - - if (connect(sfd, (struct sockaddr *) &address, sizeof(address)) < 0) - perror_msg_and_die("connect"); - } - - FD_ZERO(&readfds); - FD_SET(sfd, &readfds); - FD_SET(STDIN_FILENO, &readfds); - - while (1) { - int fd; - int ofd; - int nread; - - testfds = readfds; - - if (select(FD_SETSIZE, &testfds, NULL, NULL, NULL) < 0) - perror_msg_and_die("select"); - - for (fd = 0; fd < FD_SETSIZE; fd++) { - if (FD_ISSET(fd, &testfds)) { - if ((nread = safe_read(fd, buf, sizeof(buf))) < 0) - perror_msg_and_die("read"); - - if (fd == sfd) { - if (nread == 0) - exit(0); - ofd = STDOUT_FILENO; - } else { - if (nread == 0) - shutdown(sfd, 1); - ofd = sfd; - } - - if (full_write(ofd, buf, nread) < 0) - perror_msg_and_die("write"); - } - } - } -} |