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which can provide remote access to your device, even if the ip and firewall settings are broken git-svn-id: svn://svn.openwrt.org/openwrt/trunk@13738 3c298f89-4303-0410-b956-a3cf2f4a3e73
192 lines
4.6 KiB
C
192 lines
4.6 KiB
C
/*
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* Copyright 1990 - 1995, Julianne Frances Haugh
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* All rights reserved.
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*
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* Redistribution and use in source and binary forms, with or without
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* modification, are permitted provided that the following conditions
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* are met:
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* 1. Redistributions of source code must retain the above copyright
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* notice, this list of conditions and the following disclaimer.
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* 2. Redistributions in binary form must reproduce the above copyright
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* notice, this list of conditions and the following disclaimer in the
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* documentation and/or other materials provided with the distribution.
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* 3. Neither the name of Julianne F. Haugh nor the names of its contributors
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* may be used to endorse or promote products derived from this software
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* without specific prior written permission.
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*
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* THIS SOFTWARE IS PROVIDED BY JULIE HAUGH AND CONTRIBUTORS ``AS IS'' AND
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* ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
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* IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
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* ARE DISCLAIMED. IN NO EVENT SHALL JULIE HAUGH OR CONTRIBUTORS BE LIABLE
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* FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
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* DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
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* OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
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* HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
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* LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
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* OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
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* SUCH DAMAGE.
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*/
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#include "t_defines.h"
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#ifdef _WIN32
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#include <windows.h>
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#include <io.h>
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#endif /* _WIN32 */
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#ifdef HAVE_UNISTD_H
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#include <unistd.h>
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#endif /* HAVE_UNISTD_H */
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#include <signal.h>
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#include <stdio.h>
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static int sig_caught;
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#ifdef HAVE_SIGACTION
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static struct sigaction sigact;
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#endif
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/*ARGSUSED*/
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static RETSIGTYPE
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sig_catch (sig)
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int sig;
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{
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sig_caught = 1;
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}
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_TYPE( int )
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t_getpass (buf, maxlen, prompt)
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char *buf;
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unsigned maxlen;
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const char *prompt;
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{
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char *cp;
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#ifdef _WIN32
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HANDLE handle = (HANDLE) _get_osfhandle(_fileno(stdin));
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DWORD mode;
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GetConsoleMode( handle, &mode );
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SetConsoleMode( handle, mode & ~ENABLE_ECHO_INPUT );
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if(fputs(prompt, stdout) == EOF ||
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fgets(buf, maxlen, stdin) == NULL) {
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SetConsoleMode(handle,mode);
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return -1;
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}
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cp = buf + strlen(buf) - 1;
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if ( *cp == 0x0a )
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*cp = '\0';
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printf("\n");
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SetConsoleMode(handle,mode);
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#else
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FILE *fp;
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int tty_opened = 0;
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#ifdef HAVE_SIGACTION
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struct sigaction old_sigact;
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#else
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RETSIGTYPE (*old_signal)();
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#endif
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TERMIO new_modes;
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TERMIO old_modes;
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/*
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* set a flag so the SIGINT signal can be re-sent if it
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* is caught
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*/
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sig_caught = 0;
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/*
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* if /dev/tty can't be opened, getpass() needs to read
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* from stdin instead.
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*/
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if ((fp = fopen ("/dev/tty", "r")) == 0) {
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fp = stdin;
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setbuf (fp, (char *) 0);
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} else {
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tty_opened = 1;
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}
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/*
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* the current tty modes must be saved so they can be
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* restored later on. echo will be turned off, except
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* for the newline character (BSD has to punt on this)
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*/
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if (GTTY (fileno (fp), &new_modes))
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return -1;
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old_modes = new_modes;
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#ifdef HAVE_SIGACTION
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sigact.sa_handler = sig_catch;
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(void) sigaction (SIGINT, &sigact, &old_sigact);
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#else
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old_signal = signal (SIGINT, sig_catch);
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#endif
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#ifdef USE_SGTTY
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new_modes.sg_flags &= ~ECHO;
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#else
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new_modes.c_iflag &= ~IGNCR;
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new_modes.c_iflag |= ICRNL;
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new_modes.c_oflag |= OPOST|ONLCR;
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new_modes.c_lflag &= ~(ECHO|ECHOE|ECHOK);
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new_modes.c_lflag |= ICANON|ECHONL;
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#endif
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if (STTY (fileno (fp), &new_modes))
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goto out;
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/*
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* the prompt is output, and the response read without
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* echoing. the trailing newline must be removed. if
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* the fgets() returns an error, a NULL pointer is
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* returned.
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*/
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if (fputs (prompt, stdout) == EOF)
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goto out;
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(void) fflush (stdout);
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if (fgets (buf, maxlen, fp) == buf) {
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if ((cp = strchr (buf, '\n')))
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*cp = '\0';
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else
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buf[maxlen - 1] = '\0';
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#ifdef USE_SGTTY
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putc ('\n', stdout);
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#endif
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}
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else buf[0] = '\0';
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out:
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/*
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* the old SIGINT handler is restored after the tty
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* modes. then /dev/tty is closed if it was opened in
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* the beginning. finally, if a signal was caught it
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* is sent to this process for normal processing.
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*/
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if (STTY (fileno (fp), &old_modes))
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{ memset (buf, 0, maxlen); return -1; }
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#ifdef HAVE_SIGACTION
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(void) sigaction (SIGINT, &old_sigact, NULL);
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#else
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(void) signal (SIGINT, old_signal);
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#endif
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if (tty_opened)
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(void) fclose (fp);
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if (sig_caught) {
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kill (getpid (), SIGINT);
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memset (buf, 0, maxlen);
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return -1;
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}
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#endif
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return 0;
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}
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