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» Revision
24.1.54
(compared to revision 237.2.157)
: plugins.d/password-prompt.c
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- Committer: Björn Påhlsson
- Date: 2008-08-16 18:15:07 UTC
- mto: (237.7.1 mandos) (24.1.154 mandos)
- mto: This revision was merged to the branch mainline in revision 80.
- Revision ID: belorn@braxen-20080816181507-hubb1rsmfq9b3agl
plugin-runner
Freeing up memory during run-time.
Freeing up memory during run-time.
- files added:
- network-protocol.txt
- files removed:
- .bzr-builddeb
- debian
- debian/po
- files renamed:
- plugins.d/mandos-client.c => plugins.d/password-request.c
- plugins.d/mandos-client.xml => plugins.d/password-request.xml
- files modified:
- Makefile
added
removed
plugins.d/password-prompt.c
1
/* -*- coding: utf-8; mode: c; mode: orgtbl -*- */
1
/* -*- coding: utf-8 -*- */
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2
/*
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* Password-prompt - Read a password from the terminal and print it
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*
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* Copyright © 2008,2009 Teddy Hogeborn
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* Copyright © 2008,2009 Björn Påhlsson
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* Passprompt - Read a password from the terminal and print it
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*
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* Copyright © 2007-2008 Teddy Hogeborn & Björn Påhlsson
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*
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* This program is free software: you can redistribute it and/or
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8
* modify it under the terms of the GNU General Public License as
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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 <mandos@fukt.bsnet.se>.
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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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#define _GNU_SOURCE /* getline() */
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#include <signal.h> /* sig_atomic_t, raise(), struct
33
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sigaction, sigemptyset(),
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sigaction(), sigaddset(), SIGINT,
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SIGQUIT, SIGHUP, SIGTERM,
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raise() */
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SIGQUIT, SIGHUP, SIGTERM */
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#include <stddef.h> /* NULL, size_t, ssize_t */
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#include <sys/types.h> /* ssize_t */
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#include <stdlib.h> /* EXIT_SUCCESS, EXIT_FAILURE,
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getenv() */
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getopt_long, getenv() */
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#include <stdio.h> /* fprintf(), stderr, getline(),
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stdin, feof(), perror(), fputc()
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*/
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#include <errno.h> /* errno, EBADF, ENOTTY, EINVAL,
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EFAULT, EFBIG, EIO, ENOSPC, EINTR
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*/
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stdin, feof(), perror(), fputc(),
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stdout, getopt_long */
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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 */
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#include <string.h> /* strlen, rindex, strncmp, strcmp */
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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 */
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#include <sysexits.h> /* EX_SOFTWARE, EX_OSERR,
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EX_UNAVAILABLE, EX_IOERR, EX_OK */
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volatile sig_atomic_t quit_now = 0;
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int signal_received;
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volatile bool quit_now = false;
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bool debug = false;
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const char *argp_program_version = "password-prompt " VERSION;
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const char *argp_program_version = "password-prompt 1.0";
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const char *argp_program_bug_address = "<mandos@fukt.bsnet.se>";
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static void termination_handler(int signum){
65
if(quit_now){
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return;
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}
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quit_now = 1;
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signal_received = signum;
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static void termination_handler(__attribute__((unused))int signum){
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quit_now = true;
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}
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int main(int argc, char **argv){
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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 shown before the prompt", .group = 2 },
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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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/*
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* These reproduce what we would get without ARGP_NO_HELP
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*/
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{ .name = "help", .key = '?',
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.doc = "Give this help list", .group = -1 },
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{ .name = "usage", .key = -3,
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.doc = "Give a short usage message", .group = -1 },
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{ .name = "version", .key = 'V',
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.doc = "Print program version", .group = -1 },
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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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errno = 0;
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switch (key){
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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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/*
111
* These reproduce what we would get without ARGP_NO_HELP
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*/
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case '?': /* --help */
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argp_state_help(state, state->out_stream,
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(ARGP_HELP_STD_HELP | ARGP_HELP_EXIT_ERR)
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& ~(unsigned int)ARGP_HELP_EXIT_OK);
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case -3: /* --usage */
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argp_state_help(state, state->out_stream,
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ARGP_HELP_USAGE | ARGP_HELP_EXIT_ERR);
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case 'V': /* --version */
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fprintf(state->out_stream, "%s\n", argp_program_version);
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exit(argp_err_exit_status);
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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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99
}
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return errno;
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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 password-prompt -- Read and"
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" output a password" };
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ret = argp_parse(&argp, argc, argv,
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ARGP_IN_ORDER | ARGP_NO_HELP, NULL, NULL);
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switch(ret){
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case 0:
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break;
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case ENOMEM:
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default:
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errno = ret;
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perror("argp_parse");
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return EX_OSERR;
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case EINVAL:
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return EX_USAGE;
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.doc = "Mandos Passprompt -- Provides a passprompt" };
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ret = argp_parse (&argp, argc, argv, 0, 0, NULL);
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if (ret == ARGP_ERR_UNKNOWN){
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fprintf(stderr, "Unknown error while parsing arguments\n");
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return EXIT_FAILURE;
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}
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}
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if(debug){
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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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if (debug){
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fprintf(stderr, "Storing current terminal attributes\n");
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}
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if(tcgetattr(STDIN_FILENO, &t_old) != 0){
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int e = errno;
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perror("tcgetattr");
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switch(e){
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case EBADF:
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case ENOTTY:
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return EX_UNAVAILABLE;
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default:
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return EX_OSERR;
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}
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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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ret = sigaddset(&new_action.sa_mask, SIGINT);
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if(ret == -1){
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perror("sigaddset");
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return EX_OSERR;
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}
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ret = sigaddset(&new_action.sa_mask, SIGHUP);
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if(ret == -1){
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perror("sigaddset");
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return EX_OSERR;
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}
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ret = sigaddset(&new_action.sa_mask, SIGTERM);
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if(ret == -1){
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perror("sigaddset");
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return EX_OSERR;
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}
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/* Need to check if the handler is SIG_IGN before handling:
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| [[info:libc:Initial Signal Actions]] |
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| [[info:libc:Basic Signal Handling]] |
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*/
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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);
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ret = sigaction(SIGINT, NULL, &old_action);
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if(ret == -1){
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perror("sigaction");
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return EX_OSERR;
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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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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 EX_OSERR;
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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 EX_OSERR;
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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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if (old_action.sa_handler != SIG_IGN){
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ret = sigaction(SIGHUP, &new_action, NULL);
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if(ret == -1){
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perror("sigaction");
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return EX_OSERR;
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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 EX_OSERR;
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return EXIT_FAILURE;
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}
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if(old_action.sa_handler != SIG_IGN){
157
if (old_action.sa_handler != SIG_IGN){
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ret = sigaction(SIGTERM, &new_action, NULL);
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if(ret == -1){
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perror("sigaction");
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return EX_OSERR;
161
return EXIT_FAILURE;
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}
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}
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if(debug){
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if (debug){
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fprintf(stderr, "Removing echo flag from terminal attributes\n");
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}
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t_new = t_old;
231
t_new.c_lflag &= ~(tcflag_t)ECHO;
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if(tcsetattr(STDIN_FILENO, TCSAFLUSH, &t_new) != 0){
233
int e = errno;
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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");
235
switch(e){
236
case EBADF:
237
case ENOTTY:
238
return EX_UNAVAILABLE;
239
case EINVAL:
240
default:
241
return EX_OSERR;
242
}
174
return EXIT_FAILURE;
243
175
}
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if(debug){
176
177
if (debug){
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178
fprintf(stderr, "Waiting for input from stdin \n");
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}
248
180
while(true){
249
if(quit_now){
250
if(debug){
251
fprintf(stderr, "Interrupted by signal, exiting.\n");
252
}
181
if (quit_now){
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status = EXIT_FAILURE;
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183
break;
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184
}
278
207
}
279
208
}
280
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ret = getline(&buffer, &n, stdin);
281
if(ret > 0){
210
if (ret > 0){
211
fprintf(stdout, "%s", buffer);
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status = EXIT_SUCCESS;
283
/* Make n = data size instead of allocated buffer size */
284
n = (size_t)ret;
285
/* Strip final newline */
286
if(n > 0 and buffer[n-1] == '\n'){
287
buffer[n-1] = '\0'; /* not strictly necessary */
288
n--;
289
}
290
size_t written = 0;
291
while(written < n){
292
ret = write(STDOUT_FILENO, buffer + written, n - written);
293
if(ret < 0){
294
int e = errno;
295
perror("write");
296
switch(e){
297
case EBADF:
298
case EFAULT:
299
case EINVAL:
300
case EFBIG:
301
case EIO:
302
case ENOSPC:
303
default:
304
status = EX_IOERR;
305
break;
306
case EINTR:
307
status = EXIT_FAILURE;
308
break;
309
}
310
break;
311
}
312
written += (size_t)ret;
313
}
314
ret = close(STDOUT_FILENO);
315
if(ret == -1){
316
int e = errno;
317
perror("close");
318
switch(e){
319
case EBADF:
320
status = EX_OSFILE;
321
break;
322
case EIO:
323
default:
324
status = EX_IOERR;
325
break;
326
}
327
}
328
213
break;
329
214
}
330
if(ret < 0){
331
int e = errno;
332
if(errno != EINTR and not feof(stdin)){
215
if (ret < 0){
216
if (errno != EINTR and not feof(stdin)){
333
217
perror("getline");
334
switch(e){
335
case EBADF:
336
status = EX_UNAVAILABLE;
337
case EIO:
338
case EINVAL:
339
default:
340
status = EX_IOERR;
341
break;
342
}
218
status = EXIT_FAILURE;
343
219
break;
344
220
}
345
221
}
346
222
/* if(ret == 0), then the only sensible thing to do is to retry to
347
223
read from stdin */
348
224
fputc('\n', stderr);
349
if(debug and not quit_now){
350
/* If quit_now is nonzero, we were interrupted by a signal, and
351
will print that later, so no need to show this too. */
352
fprintf(stderr, "getline() returned 0, retrying.\n");
353
}
354
225
}
355
226
356
free(buffer);
357
358
if(debug){
227
if (debug){
359
228
fprintf(stderr, "Restoring terminal attributes\n");
360
229
}
361
if(tcsetattr(STDIN_FILENO, TCSAFLUSH, &t_old) != 0){
230
if (tcsetattr(STDIN_FILENO, TCSAFLUSH, &t_old) != 0){
362
231
perror("tcsetattr+echo");
363
232
}
364
233
365
if(quit_now){
366
sigemptyset(&old_action.sa_mask);
367
old_action.sa_handler = SIG_DFL;
368
ret = sigaction(signal_received, &old_action, NULL);
369
if(ret == -1){
370
perror("sigaction");
371
}
372
raise(signal_received);
373
}
374
375
if(debug){
376
fprintf(stderr, "%s is exiting with status %d\n", argv[0],
377
status);
378
}
379
if(status == EXIT_SUCCESS or status == EX_OK){
380
fputc('\n', stderr);
234
if (debug){
235
fprintf(stderr, "%s is exiting\n", argv[0]);
381
236
}
382
237
383
238
return status;
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