root/source4/heimdal/lib/hcrypto/ui.c

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DEFINITIONS

This source file includes following definitions.
  1. intr
  2. read_string
  3. UI_UTIL_read_pw_string

   1 /*
   2  * Copyright (c) 1997 - 2000, 2005 Kungliga Tekniska Högskolan
   3  * (Royal Institute of Technology, Stockholm, Sweden).
   4  * All rights reserved.
   5  *
   6  * Redistribution and use in source and binary forms, with or without
   7  * modification, are permitted provided that the following conditions
   8  * are met:
   9  *
  10  * 1. Redistributions of source code must retain the above copyright
  11  *    notice, this list of conditions and the following disclaimer.
  12  *
  13  * 2. Redistributions in binary form must reproduce the above copyright
  14  *    notice, this list of conditions and the following disclaimer in the
  15  *    documentation and/or other materials provided with the distribution.
  16  *
  17  * 3. Neither the name of the Institute nor the names of its contributors
  18  *    may be used to endorse or promote products derived from this software
  19  *    without specific prior written permission.
  20  *
  21  * THIS SOFTWARE IS PROVIDED BY THE INSTITUTE AND CONTRIBUTORS ``AS IS'' AND
  22  * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
  23  * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
  24  * ARE DISCLAIMED.  IN NO EVENT SHALL THE INSTITUTE OR CONTRIBUTORS BE LIABLE
  25  * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
  26  * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
  27  * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
  28  * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
  29  * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
  30  * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
  31  * SUCH DAMAGE.
  32  */
  33 
  34 #ifdef HAVE_CONFIG_H
  35 #include <config.h>
  36 RCSID("$Id$");
  37 #endif
  38 
  39 #include <stdio.h>
  40 #include <stdlib.h>
  41 #include <string.h>
  42 #include <signal.h>
  43 #include <termios.h>
  44 #include <roken.h>
  45 
  46 #include <ui.h>
  47 
  48 static sig_atomic_t intr_flag;
  49 
  50 static void
  51 intr(int sig)
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  52 {
  53     intr_flag++;
  54 }
  55 
  56 #ifndef NSIG
  57 #define NSIG 47
  58 #endif
  59 
  60 static int
  61 read_string(const char *preprompt, const char *prompt,
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  62             char *buf, size_t len, int echo)
  63 {
  64     struct sigaction sigs[NSIG];
  65     int oksigs[NSIG];
  66     struct sigaction sa;
  67     FILE *tty;
  68     int ret = 0;
  69     int of = 0;
  70     int i;
  71     int c;
  72     char *p;
  73 
  74     struct termios t_new, t_old;
  75 
  76     memset(&oksigs, 0, sizeof(oksigs));
  77 
  78     memset(&sa, 0, sizeof(sa));
  79     sa.sa_handler = intr;
  80     sigemptyset(&sa.sa_mask);
  81     sa.sa_flags = 0;
  82     for(i = 1; i < sizeof(sigs) / sizeof(sigs[0]); i++)
  83         if (i != SIGALRM)
  84             if (sigaction(i, &sa, &sigs[i]) == 0)
  85                 oksigs[i] = 1;
  86 
  87     if((tty = fopen("/dev/tty", "r")) != NULL)
  88         rk_cloexec_file(tty);
  89     else
  90         tty = stdin;
  91 
  92     fprintf(stderr, "%s%s", preprompt, prompt);
  93     fflush(stderr);
  94 
  95     if(echo == 0){
  96         tcgetattr(fileno(tty), &t_old);
  97         memcpy(&t_new, &t_old, sizeof(t_new));
  98         t_new.c_lflag &= ~ECHO;
  99         tcsetattr(fileno(tty), TCSANOW, &t_new);
 100     }
 101     intr_flag = 0;
 102     p = buf;
 103     while(intr_flag == 0){
 104         c = getc(tty);
 105         if(c == EOF){
 106             if(!ferror(tty))
 107                 ret = 1;
 108             break;
 109         }
 110         if(c == '\n')
 111             break;
 112         if(of == 0)
 113             *p++ = c;
 114         of = (p == buf + len);
 115     }
 116     if(of)
 117         p--;
 118     *p = 0;
 119 
 120     if(echo == 0){
 121         fprintf(stderr, "\n");
 122         tcsetattr(fileno(tty), TCSANOW, &t_old);
 123     }
 124 
 125     if(tty != stdin)
 126         fclose(tty);
 127 
 128     for(i = 1; i < sizeof(sigs) / sizeof(sigs[0]); i++)
 129         if (oksigs[i])
 130             sigaction(i, &sigs[i], NULL);
 131 
 132     if(ret)
 133         return -3;
 134     if(intr_flag)
 135         return -2;
 136     if(of)
 137         return -1;
 138     return 0;
 139 }
 140 
 141 int
 142 UI_UTIL_read_pw_string(char *buf, int length, const char *prompt, int verify)
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 143 {
 144     int ret;
 145 
 146     ret = read_string("", prompt, buf, length, 0);
 147     if (ret)
 148         return ret;
 149 
 150     if (verify) {
 151         char *buf2;
 152         buf2 = malloc(length);
 153         if (buf2 == NULL)
 154             return 1;
 155 
 156         ret = read_string("Verify password - ", prompt, buf2, length, 0);
 157         if (ret) {
 158             free(buf2);
 159             return ret;
 160         }
 161         if (strcmp(buf2, buf) != 0)
 162             ret = 1;
 163         free(buf2);
 164     }
 165     return ret;
 166 }

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