/mandos/trunk

To get this branch, use:
bzr branch http://bzr.recompile.se/loggerhead/mandos/trunk
21 by Teddy Hogeborn
* Makefile (CFLAGS): Changed to use $(WARN), $(DEBUG), $(COVERAGE) and
1
/*  -*- coding: utf-8 -*- */
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/*
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 * Passprompt - Read a password from the terminal and print it
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 *
28 by Teddy Hogeborn
* server.conf: New file.
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 * Copyright © 2007-2008 Teddy Hogeborn & Björn Påhlsson
21 by Teddy Hogeborn
* Makefile (CFLAGS): Changed to use $(WARN), $(DEBUG), $(COVERAGE) and
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 * 
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 * This program is free software: you can redistribute it and/or
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 * modify it under the terms of the GNU General Public License as
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 * published by the Free Software Foundation, either version 3 of the
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 * License, or (at your option) any later version.
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 * 
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 * This program is distributed in the hope that it will be useful, but
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 * WITHOUT ANY WARRANTY; without even the implied warranty of
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 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
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 * General Public License for more details.
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 * 
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 * You should have received a copy of the GNU General Public License
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 * along with this program.  If not, see
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 * <http://www.gnu.org/licenses/>.
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 * 
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 * Contact the authors at <https://www.fukt.bsnet.se/~belorn/> and
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 * <https://www.fukt.bsnet.se/~teddy/>.
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 */
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13 by Björn Påhlsson
Added following support:
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#define _GNU_SOURCE		/* getline() */
21 by Teddy Hogeborn
* Makefile (CFLAGS): Changed to use $(WARN), $(DEBUG), $(COVERAGE) and
26
13 by Björn Påhlsson
Added following support:
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#include <termios.h> 		/* struct termios, tcsetattr(),
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				   TCSAFLUSH, tcgetattr(), ECHO */
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#include <unistd.h>		/* struct termios, tcsetattr(),
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				   STDIN_FILENO, TCSAFLUSH,
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				   tcgetattr(), ECHO */
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#include <signal.h>		/* sig_atomic_t, raise(), struct
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				   sigaction, sigemptyset(),
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				   sigaction(), sigaddset(), SIGINT,
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				   SIGQUIT, SIGHUP, SIGTERM */
24.1.26 by Björn Påhlsson
tally count of used symbols
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#include <stddef.h>		/* NULL, size_t, ssize_t */
13 by Björn Påhlsson
Added following support:
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#include <sys/types.h>		/* ssize_t */
15.1.3 by Björn Påhlsson
Added getopt_long support for mandosclient and passprompt
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#include <stdlib.h>		/* EXIT_SUCCESS, EXIT_FAILURE,
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				   getopt_long */
13 by Björn Påhlsson
Added following support:
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#include <stdio.h>		/* fprintf(), stderr, getline(),
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				   stdin, feof(), perror(), fputc(),
15.1.3 by Björn Påhlsson
Added getopt_long support for mandosclient and passprompt
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				   stdout, getopt_long */
13 by Björn Påhlsson
Added following support:
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#include <errno.h>		/* errno, EINVAL */
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#include <iso646.h>		/* or, not */
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#include <stdbool.h>		/* bool, false, true */
15.1.2 by Björn Påhlsson
Added debug options from passprompt as --debug and --debug=passprompt
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#include <string.h> 		/* strlen, rindex, strncmp, strcmp */
24.1.26 by Björn Påhlsson
tally count of used symbols
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#include <argp.h>		/* struct argp_option, struct
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				   argp_state, struct argp,
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				   argp_parse(), error_t,
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				   ARGP_KEY_ARG, ARGP_KEY_END,
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				   ARGP_ERR_UNKNOWN */
13 by Björn Påhlsson
Added following support:
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volatile bool quit_now = false;
15.1.2 by Björn Påhlsson
Added debug options from passprompt as --debug and --debug=passprompt
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bool debug = false;
24.1.17 by Björn Påhlsson
passprompt
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const char *argp_program_version = "passprompt 0.9";
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const char *argp_program_bug_address = "<mandos@fukt.bsnet.se>";
13 by Björn Påhlsson
Added following support:
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37 by Teddy Hogeborn
Non-tested commit for merge purposes.
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static void termination_handler(__attribute__((unused))int signum){
13 by Björn Påhlsson
Added following support:
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  quit_now = true;
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}
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int main(int argc, char **argv){
15.1.3 by Björn Påhlsson
Added getopt_long support for mandosclient and passprompt
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  ssize_t ret;
13 by Björn Påhlsson
Added following support:
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  size_t n;
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  struct termios t_new, t_old;
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  char *buffer = NULL;
15.1.3 by Björn Påhlsson
Added getopt_long support for mandosclient and passprompt
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  char *prefix = NULL;
13 by Björn Påhlsson
Added following support:
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  int status = EXIT_SUCCESS;
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  struct sigaction old_action,
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    new_action = { .sa_handler = termination_handler,
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		   .sa_flags = 0 };
24.1.17 by Björn Påhlsson
passprompt
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  {
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    struct argp_option options[] = {
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      { .name = "prefix", .key = 'p',
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	.arg = "PREFIX", .flags = 0,
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	.doc = "Prefix used before the passprompt", .group = 2 },
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      { .name = "debug", .key = 128,
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	.doc = "Debug mode", .group = 3 },
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      { .name = NULL }
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    };
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    error_t parse_opt (int key, char *arg, struct argp_state *state) {
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      /* Get the INPUT argument from `argp_parse', which we know is a
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	 pointer to our plugin list pointer. */
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      switch (key) {
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      case 'p':
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	prefix = arg;
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	break;
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      case 128:
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	debug = true;
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	break;
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      case ARGP_KEY_ARG:
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	argp_usage (state);
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	break;
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      case ARGP_KEY_END:
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	break;
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      default:
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	return ARGP_ERR_UNKNOWN;
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      }
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      return 0;
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    }
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    struct argp argp = { .options = options, .parser = parse_opt,
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			 .args_doc = "",
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			 .doc = "Mandos Passprompt -- Provides a passprompt" };
24.1.26 by Björn Påhlsson
tally count of used symbols
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    ret = argp_parse (&argp, argc, argv, 0, 0, NULL);
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    if (ret == ARGP_ERR_UNKNOWN){
24.1.29 by Björn Påhlsson
Added more header file comments
108
      fprintf(stderr, "Unkown error while parsing arguments\n");
24.1.26 by Björn Påhlsson
tally count of used symbols
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      return EXIT_FAILURE;
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    }
15.1.3 by Björn Påhlsson
Added getopt_long support for mandosclient and passprompt
111
  }
24.1.17 by Björn Påhlsson
passprompt
112
    
15.1.2 by Björn Påhlsson
Added debug options from passprompt as --debug and --debug=passprompt
113
  if (debug){
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    fprintf(stderr, "Starting %s\n", argv[0]);
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  }
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  if (debug){
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    fprintf(stderr, "Storing current terminal attributes\n");
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  }
13 by Björn Påhlsson
Added following support:
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120
  if (tcgetattr(STDIN_FILENO, &t_old) != 0){
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    return EXIT_FAILURE;
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  }
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  sigemptyset(&new_action.sa_mask);
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  sigaddset(&new_action.sa_mask, SIGINT);
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  sigaddset(&new_action.sa_mask, SIGHUP);
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  sigaddset(&new_action.sa_mask, SIGTERM);
24.1.26 by Björn Påhlsson
tally count of used symbols
128
  ret = sigaction(SIGINT, NULL, &old_action);
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  if(ret == -1){
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    perror("sigaction");
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    return EXIT_FAILURE;
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  }
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  if (old_action.sa_handler != SIG_IGN){
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    ret = sigaction(SIGINT, &new_action, NULL);
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    if(ret == -1){
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      perror("sigaction");
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      return EXIT_FAILURE;
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    }
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  }
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  ret = sigaction(SIGHUP, NULL, &old_action);
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  if(ret == -1){
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    perror("sigaction");
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    return EXIT_FAILURE;
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  }
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  if (old_action.sa_handler != SIG_IGN){
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    ret = sigaction(SIGHUP, &new_action, NULL);
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    if(ret == -1){
148
      perror("sigaction");
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      return EXIT_FAILURE;
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    }
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  }
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  ret = sigaction(SIGTERM, NULL, &old_action);
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  if(ret == -1){
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    perror("sigaction");
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    return EXIT_FAILURE;
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  }
157
  if (old_action.sa_handler != SIG_IGN){
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    ret = sigaction(SIGTERM, &new_action, NULL);
159
    if(ret == -1){
160
      perror("sigaction");
161
      return EXIT_FAILURE;
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    }
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  }
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15.1.2 by Björn Påhlsson
Added debug options from passprompt as --debug and --debug=passprompt
165
  
166
  if (debug){
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    fprintf(stderr, "Removing echo flag from terminal attributes\n");
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  }
13 by Björn Påhlsson
Added following support:
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170
  t_new = t_old;
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  t_new.c_lflag &= ~ECHO;
172
  if (tcsetattr(STDIN_FILENO, TCSAFLUSH, &t_new) != 0){
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    perror("tcsetattr-echo");
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    return EXIT_FAILURE;
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  }
15.1.2 by Björn Påhlsson
Added debug options from passprompt as --debug and --debug=passprompt
176
177
  if (debug){
178
    fprintf(stderr, "Waiting for input from stdin \n");
179
  }
13 by Björn Påhlsson
Added following support:
180
  while(true){
181
    if (quit_now){
182
      status = EXIT_FAILURE;
183
      break;
184
    }
15.1.3 by Björn Påhlsson
Added getopt_long support for mandosclient and passprompt
185
186
    if(prefix){
187
      fprintf(stderr, "%s Password: ", prefix);
188
    } else {
189
      fprintf(stderr, "Password: ");
190
    }      
13 by Björn Påhlsson
Added following support:
191
    ret = getline(&buffer, &n, stdin);
192
    if (ret > 0){
193
      fprintf(stdout, "%s", buffer);
194
      status = EXIT_SUCCESS;
195
      break;
196
    }
197
    if (ret < 0){
198
      if (errno != EINTR and not feof(stdin)){
199
	perror("getline");
200
	status = EXIT_FAILURE;
201
	break;
202
      }
203
    }
41 by Teddy Hogeborn
Merge.
204
    /* if(ret == 0), then the only sensible thing to do is to retry to
205
       read from stdin */
13 by Björn Påhlsson
Added following support:
206
    fputc('\n', stderr);
207
  }
41 by Teddy Hogeborn
Merge.
208
  
15.1.2 by Björn Påhlsson
Added debug options from passprompt as --debug and --debug=passprompt
209
  if (debug){
210
    fprintf(stderr, "Restoring terminal attributes\n");
211
  }
13 by Björn Påhlsson
Added following support:
212
  if (tcsetattr(STDIN_FILENO, TCSAFLUSH, &t_old) != 0){
213
    perror("tcsetattr+echo");
214
  }
41 by Teddy Hogeborn
Merge.
215
  
15.1.2 by Björn Påhlsson
Added debug options from passprompt as --debug and --debug=passprompt
216
  if (debug){
217
    fprintf(stderr, "%s is exiting\n", argv[0]);
218
  }
13 by Björn Påhlsson
Added following support:
219
  
220
  return status;
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}