/*  * Copyright (C) 2002  Mihai RUSU (dizzy@roedu.net)  *  * 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 <sys/types.h>#include <sys/socket.h>#include <unistd.h>#include <fcntl.h>#include <sys/un.h>#include <stdio.h>#include <string.h>static char *unixpath;static int sock, term;volatile static int quitasap = 0;static void usage(void);static int init_socket(char*);static void close_socket();static void mainloop(void);static void read_sock(void);static void read_term(void);int main(int argc, char ** argv){   if (argc != 2) usage();   if (init_socket(argv[1]) < 0) return -1;   mainloop();   close_socket();   return 0;}static void usage(void){   printf("Usage: utelnet <unix-socket>\n");   exit(-1);}static int init_socket(char *upath){   struct sockaddr_un addr;      if (upath == NULL) return -1;   unixpath = upath;      sock = socket(PF_UNIX, SOCK_STREAM, 0);   if (sock < 0) {      printf("Error doing socket()\n");      return -1;   }   addr.sun_family = AF_UNIX;   strcpy(addr.sun_path, upath);   if (connect(sock, (struct sockaddr *)&addr, sizeof(addr))) {      printf("Error doing connect()\n");      close(sock);      return -1;   }      term = open("/dev/tty", O_RDWR);   if (term < 0) {      printf("Error doing /dev/tty\n");      close(sock);      return -1;   }      return 0;}static void close_socket(void){   if (sock > 0) close(sock);   if (term > 0) close(term);}static void mainloop(void){   int maxsocket;   int res;   fd_set rfds;   maxsocket = sock;   if (maxsocket < term) maxsocket = term;   while (!quitasap) {      FD_ZERO(&rfds);      FD_SET(sock, &rfds);      FD_SET(term, &rfds);      res = select(maxsocket + 1, &rfds, NULL, NULL, NULL);      if (res <= 0) quitasap = 1;      else {	 if (FD_ISSET(sock, &rfds)) read_sock();	 if (FD_ISSET(term, &rfds)) read_term();      }   }}static void read_sock(void){   char buffer[1024];   int res;      if (sock < 1 || term < 1) {      quitasap = 1;      return;   }      res = read(sock , buffer, 1024);   if (res <= 0) {      quitasap = 1;      return;   }      res = write(term, buffer, res);   if (res <= 0) {      quitasap = 1;      return;   }}static void read_term(void){   char buffer[1024];   int res;      if (sock < 1 || term < 1) {      quitasap = 1;      return;   }      res = read(term, buffer, 1024);   if (res <= 0) {      quitasap = 1;      return;   }      res = write(sock, buffer, res);   if (res <= 0) {      quitasap = 1;      return;   }}