read_pwd.c

IP网络语音通讯软件源代码. 不可多得的语音源代码

/* lib/des/read_pwd.c */
/* Copyright (C) 1995 Eric Young ([e-mail])
 * All rights reserved.
 * 
 * This file is part of an SSL implementation written
 * by Eric Young ([e-mail]).
 * The implementation was written so as to conform with Netscapes SSL
 * specification.  This library and applications are
 * FREE FOR COMMERCIAL AND NON-COMMERCIAL USE
 * as long as the following conditions are aheared to.
 * 
 * Copyright remains Eric Young's, and as such any Copyright notices in
 * the code are not to be removed.	If this code is used in a product,
 * Eric Young should be given attribution as the author of the parts used.
 * This can be in the form of a textual message at program startup or
 * in documentation (online or textual) provided with the package.
 * 
 * Redistribution and use in source and binary forms, with or without
 * modification, are permitted provided that the following conditions
 * are met:
 * 1. Redistributions of source code must retain the copyright
 *	  notice, this list of conditions and the following disclaimer.
 * 2. Redistributions in binary form must reproduce the above copyright
 *	  notice, this list of conditions and the following disclaimer in the
 *	  documentation and/or other materials provided with the distribution.
 * 3. All advertising materials mentioning features or use of this software
 *	  must display the following acknowledgement:
 *	  This product includes software developed by Eric Young ([e-mail])
 * 
 * THIS SOFTWARE IS PROVIDED BY ERIC YOUNG ``AS IS'' AND
 * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
 * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
 * ARE DISCLAIMED.	IN NO EVENT SHALL THE AUTHOR OR CONTRIBUTORS BE LIABLE
 * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
 * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
 * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
 * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
 * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
 * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
 * SUCH DAMAGE.
 * 
 * The licence and distribution terms for any publically available version or
 * derivative of this code cannot be changed.  i.e. this code cannot simply be
 * copied and put under another distribution licence
 * [including the GNU Public Licence.]
 */

/* 06-Apr-92 Luke Brennan	 Support for VMS */
#include "des_locl.h"
#include <signal.h>
#include <string.h>
#include <setjmp.h>

/* There are 5 types of terminal interface supported,
 * TERMIO, TERMIOS, VMS, MSDOS and SGTTY
 */

#if defined(sgi) || defined(__sgi)
#define TERMIOS
#undef TERMIO
#undef SGTTY
#endif

#ifdef _LIBC
#define TERMIO
#endif

#if !defined(TERMIO) && !defined(TERMIOS) && !defined(VMS) && !defined(MSDOS)
#define SGTTY
#endif

#ifdef TERMIOS
#include <termios.h>
#define TTY_STRUCT				struct termios
#define TTY_FLAGS				c_lflag
#define TTY_get(tty,data)		tcgetattr(tty,data)
#define TTY_set(tty,data)		tcsetattr(tty,TCSANOW,data)
#endif

#ifdef TERMIO
#include <termio.h>
#define TTY_STRUCT				struct termio
#define TTY_FLAGS				c_lflag
#define TTY_get(tty,data)		ioctl(tty,TCGETA,data)
#define TTY_set(tty,data)		ioctl(tty,TCSETA,data)
#endif

#ifdef SGTTY
#include <sgtty.h>
#define TTY_STRUCT				struct sgttyb
#define TTY_FLAGS				sg_flags
#define TTY_get(tty,data)		ioctl(tty,TIOCGETP,data)
#define TTY_set(tty,data)		ioctl(tty,TIOCSETP,data)
#endif

#ifndef _LIBC
#include <sys/ioctl.h>
#endif

#ifdef MSDOS
#include <conio.h>
#define fgets(a,b,c) noecho_fgets(a,b,c)
#endif

#ifdef VMS
#include <ssdef.h>
#include <iodef.h>
#include <ttdef.h>
#include <descrip.h>
struct IOSB {
		short iosb$w_value;
		short iosb$w_count;
		long  iosb$l_info;
		};
#endif

#ifndef NX509_SIG
#define NX509_SIG 32
#endif

#ifdef PROTO
static void read_till_nl(FILE *);
static int read_pw(char *buf, char *buff, int size, char *prompt, int verify);
static void recsig(int);
static void pushsig(void);
static void popsig(void);
#ifdef MSDOS
static int noecho_fgets(char *buf, int size, FILE *tty);
#endif
#else
static void read_till_nl();
static int read_pw();
static void recsig();
static void pushsig();
static void popsig();
#ifdef MSDOS
static int noecho_fgets();
#endif
#endif

static void (*savsig[NX509_SIG])();
static jmp_buf save;

int des_read_password(key, prompt, verify)
des_cblock (*key);
char *prompt;
int verify;
		{
		int ok;
		char buf[BUFSIZ],buff[BUFSIZ];

		if ((ok=read_pw(buf,buff,BUFSIZ,prompt,verify)) == 0)
				des_string_to_key(buf,key);
		memset(buf,0,BUFSIZ);
		memset(buff,0,BUFSIZ);
		return(ok);
		}

int des_read_2passwords(key1, key2, prompt, verify)
des_cblock (*key1);
des_cblock (*key2);
char *prompt;
int verify;
		{
		int ok;
		char buf[BUFSIZ],buff[BUFSIZ];

		if ((ok=read_pw(buf,buff,BUFSIZ,prompt,verify)) == 0)
				des_string_to_2keys(buf,key1,key2);
		memset(buf,0,BUFSIZ);
		memset(buff,0,BUFSIZ);
		return(ok);
		}

int des_read_pw_string(buf, length, prompt, verify)
char *buf;
int length;
char *prompt;
int verify;
		{
		char buff[BUFSIZ];
		int ret;

		ret=read_pw(buf,buff,(length>BUFSIZ)?BUFSIZ:length,prompt,verify);
		memset(buff,0,BUFSIZ);
		return(ret);
		}

static void read_till_nl(in)
FILE *in;
		{
#define SIZE 4
		char buf[SIZE+1];

		do		{
				fgets(buf,SIZE,in);
                } while (strchr(buf,'\n') == NULL);
		}

/* return 0 if ok, 1 (or -1) otherwise */
static int read_pw(buf, buff, size, prompt, verify)
char *buf;
char *buff;
int size;
char *prompt;
int verify;
		{
#ifdef VMS
		struct IOSB iosb;
        $DESCRIPTOR(terminal,"TT");
		long tty_orig[3], tty_new[3];
		long status;
		unsigned short channel = 0;
#else
#ifndef MSDOS
		TTY_STRUCT tty_orig,tty_new;
#endif
#endif
		int number=5;
		int ok=0;
		int ps=0;
		FILE *tty=NULL;
		char *p;

#ifndef MSDOS
        if ((tty=fopen("/dev/tty","r")) == NULL)
				tty=stdin;
#else /* MSDOS */
        if ((tty=fopen("con","r")) == NULL)
				tty=stdin;
#endif /* MSDOS */

#if defined(TTY_get) && !defined(VMS)
		if (TTY_get(fileno(tty),&tty_orig) == -1)
				return(-1);
		memcpy(&(tty_new),&(tty_orig),sizeof(tty_orig));
#endif
#ifdef VMS
		status = SYS$ASSIGN(&terminal,&channel,0,0);
		if (status != SS$_NORMAL)
				return(-1);
		status=SYS$QIOW(0,channel,IO$_SENSEMODE,&iosb,0,0,tty_orig,12,0,0,0,0);
		if ((status != SS$_NORMAL) || (iosb.iosb$w_value != SS$_NORMAL))
				return(-1);
#endif

		if (setjmp(save))
				{
				ok=0;
				goto error;
				}
		pushsig();
		ps=1;

#ifdef TTY_FLAGS
		tty_new.TTY_FLAGS &= ~ECHO;
#endif

#if defined(TTY_set) && !defined(VMS)
		if (TTY_set(fileno(tty),&tty_new) == -1)
				return(-1);
#endif
#ifdef VMS
		tty_new[0] = tty_orig[0];
		tty_new[1] = tty_orig[1] | TT$M_NOECHO;
		tty_new[2] = tty_orig[2];
		status = SYS$QIOW(0,channel,IO$_SETMODE,&iosb,0,0,tty_new,12,0,0,0,0);
		if ((status != SS$_NORMAL) || (iosb.iosb$w_value != SS$_NORMAL))
				return(-1);
#endif
		ps=2;

		while ((!ok) && (number--))
				{
				fputs(prompt,stderr);
				fflush(stderr);

                buf[0]='\0';
				fgets(buf,size,tty);
				if (feof(tty)) goto error;
                if ((p=(char *)strchr(buf,'\n')) != NULL)
                        *p='\0';
				else	read_till_nl(tty);
				if (verify)
						{
                        fprintf(stderr,"\nVerifying password %s",prompt);
						fflush(stderr);
                        buff[0]='\0';
						fgets(buff,size,tty);
						if (feof(tty)) goto error;
                        if ((p=(char *)strchr(buff,'\n')) != NULL)
                                *p='\0';
						else	read_till_nl(tty);
								
						if (strcmp(buf,buff) != 0)
								{
                                fprintf(stderr,"\nVerify failure");
								fflush(stderr);
								break;
								/* continue; */
								}
						}
				ok=1;
				}

error:
        fprintf(stderr,"\n");
		/* What can we do if there is an error? */
#if defined(TTY_set) && !defined(VMS) 
		if (ps >= 2) TTY_set(fileno(tty),&tty_orig);
#endif
#ifdef VMS
		if (ps >= 2)
				status = SYS$QIOW(0,channel,IO$_SETMODE,&iosb,0,0
						,tty_orig,12,0,0,0,0);
#endif
		
		if (ps >= 1) popsig();
		if (stdin != tty) fclose(tty);
#ifdef VMS
		status = SYS$DASSGN(channel);
#endif
		return(!ok);
		}

static void pushsig()
		{
		int i;

		for (i=1; i<NX509_SIG; i++)
				savsig[i]=signal(i,recsig);
		}

static void popsig()
		{
		int i;

		for (i=1; i<NX509_SIG; i++)
				signal(i,savsig[i]);
		}

static void recsig(i)
int i;
		{
		longjmp(save,1);
#ifdef LINT
		i=i;
#endif
		}

#ifdef MSDOS
static int noecho_fgets(buf,size,tty)
char *buf;
int size;
FILE *tty;
		{
		int i,n;
		char *p;

		p=buf;
		for (;;)
				{
				if (size == 0)
						{
                        *p='\0';
						break;
						}
				size--;
				i=getch();
                if (i == '\r') i='\n';
				*(p++)=i;
                if (i == '\n')
						{
                        *p='\0';
						break;
						}
				}
		return(strlen(buf));
		}
#endif