97 lines
2.3 KiB
C
97 lines
2.3 KiB
C
/*
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VTun - Virtual Tunnel over TCP/IP network.
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Copyright (C) 1998-2000 Maxim Krasnyansky <max_mk@yahoo.com>
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VTun has been derived from VPPP package by Maxim Krasnyansky.
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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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*/
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/*
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* $Id: pty_dev.c,v 1.4.2.1 2007/06/29 05:26:57 mtbishop Exp $
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*/
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#include "config.h"
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#include <unistd.h>
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#include <fcntl.h>
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#include <stdlib.h>
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#include <stdio.h>
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#include <string.h>
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#include <syslog.h>
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#include "vtun.h"
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#include "lib.h"
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/*
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* Allocate pseudo tty, returns master side fd.
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* Stores slave name in the first arg(must be large enough).
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*/
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int pty_open(char *sl_name)
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{
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int mr_fd;
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#if defined (HAVE_GETPT) && defined (HAVE_GRANTPT) && defined (HAVE_UNLOCKPT) && defined (HAVE_PTSNAME)
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char *ptyname;
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if((mr_fd=getpt()) < 0)
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return -1;
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if(grantpt(mr_fd) != 0)
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return -1;
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if(unlockpt(mr_fd) != 0)
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return -1;
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if ((ptyname = (char*)ptsname(mr_fd)) == NULL)
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return -1;
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strcpy(sl_name, ptyname);
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return mr_fd;
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#else
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char ptyname[] = "/dev/ptyXY";
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char ch[] = "pqrstuvwxyz";
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char digit[] = "0123456789abcdefghijklmnopqrstuv";
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int l, m;
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/* This algorithm should work for almost all standard Unices */
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for(l=0; ch[l]; l++ ) {
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for(m=0; digit[m]; m++ ) {
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ptyname[8] = ch[l];
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ptyname[9] = digit[m];
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/* Open the master */
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if( (mr_fd=open(ptyname, O_RDWR)) < 0 )
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continue;
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/* Check the slave */
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ptyname[5] = 't';
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if( (access(ptyname, R_OK | W_OK)) < 0 ){
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close(mr_fd);
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ptyname[5] = 'p';
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continue;
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}
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strcpy(sl_name,ptyname);
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return mr_fd;
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}
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}
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return -1;
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#endif
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}
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/* Write frames to PTY device */
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int pty_write(int fd, char *buf, int len)
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{
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return write_n(fd, buf, len);
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}
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/* Read frames from PTY device */
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int pty_read(int fd, char *buf, int len)
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{
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return read(fd, buf, len);
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}
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