lib/hcrypto/ui.c

   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)
  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,
  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         tty = stdin;
  89
  90     fprintf(stderr, "%s%s", preprompt, prompt);
  91     fflush(stderr);
  92
  93     if(echo == 0){
  94         tcgetattr(fileno(tty), &t_old);
  95         memcpy(&t_new, &t_old, sizeof(t_new));
  96         t_new.c_lflag &= ~ECHO;
  97         tcsetattr(fileno(tty), TCSANOW, &t_new);
  98     }
  99     intr_flag = 0;
 100     p = buf;
 101     while(intr_flag == 0){
 102         c = getc(tty);
 103         if(c == EOF){
 104             if(!ferror(tty))
 105                 ret = 1;
 106             break;
 107         }
 108         if(c == '\n')
 109             break;
 110         if(of == 0)
 111             *p++ = c;
 112         of = (p == buf + len);
 113     }
 114     if(of)
 115         p--;
 116     *p = 0;
 117
 118     if(echo == 0){
 119         printf("\n");
 120         tcsetattr(fileno(tty), TCSANOW, &t_old);
 121     }
 122
 123     if(tty != stdin)
 124         fclose(tty);
 125
 126     for(i = 1; i < sizeof(sigs) / sizeof(sigs[0]); i++)
 127         if (oksigs[i])
 128             sigaction(i, &sigs[i], NULL);
 129
 130     if(ret)
 131         return -3;
 132     if(intr_flag)
 133         return -2;
 134     if(of)
 135         return -1;
 136     return 0;
 137 }
 138
 139 int
 140 UI_UTIL_read_pw_string(char *buf, int length, const char *prompt, int verify)
 141 {
 142     int ret;
 143
 144     ret = read_string("", prompt, buf, length, 0);
 145     if (ret)
 146         return ret;
 147
 148     if (verify) {
 149         char *buf2;
 150         buf2 = malloc(length);
 151         if (buf2 == NULL)
 152             return 1;
 153
 154         ret = read_string("Verify password - ", prompt, buf2, length, 0);
 155         if (ret) {
 156             free(buf2);
 157             return ret;
 158         }
 159         if (strcmp(buf2, buf) != 0)
 160             ret = 1;
 161         free(buf2);
 162     }
 163     return ret;
 164 }