1
/* -*- coding: utf-8 -*- */
3
* Passprompt - Read a password from splashy and output it
5
* Copyright © 2008,2009 Teddy Hogeborn
6
* Copyright © 2008,2009 Björn Påhlsson
8
* This program is free software: you can redistribute it and/or
9
* modify it under the terms of the GNU General Public License as
10
* published by the Free Software Foundation, either version 3 of the
11
* License, or (at your option) any later version.
13
* This program is distributed in the hope that it will be useful, but
14
* WITHOUT ANY WARRANTY; without even the implied warranty of
15
* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
16
* General Public License for more details.
18
* You should have received a copy of the GNU General Public License
19
* along with this program. If not, see
20
* <http://www.gnu.org/licenses/>.
22
* Contact the authors at <https://www.fukt.bsnet.se/~belorn/> and
23
* <https://www.fukt.bsnet.se/~teddy/>.
1
26
#define _GNU_SOURCE /* asprintf() */
2
27
#include <signal.h> /* sig_atomic_t, struct sigaction,
3
sigemptyset(), sigaddset(),
4
sigaction, SIGINT, SIG_IGN, SIGHUP,
5
SIGTERM, kill(), SIGKILL */
28
sigemptyset(), sigaddset(), SIGINT,
29
SIGHUP, SIGTERM, sigaction,
30
SIG_IGN, kill(), SIGKILL */
6
31
#include <stddef.h> /* NULL */
7
32
#include <stdlib.h> /* getenv() */
8
33
#include <stdio.h> /* asprintf(), perror() */
9
#include <stdlib.h> /* EXIT_FAILURE, EXIT_SUCCESS,
34
#include <stdlib.h> /* EXIT_FAILURE, free(), strtoul(),
11
36
#include <sys/types.h> /* pid_t, DIR, struct dirent,
13
38
#include <dirent.h> /* opendir(), readdir(), closedir() */
39
#include <sys/stat.h> /* struct stat, lstat(), S_ISLNK */
40
#include <iso646.h> /* not, or, and */
14
41
#include <unistd.h> /* readlink(), fork(), execl(),
42
sleep(), dup2() STDERR_FILENO,
43
STDOUT_FILENO, _exit() */
16
44
#include <string.h> /* memcmp() */
17
#include <iso646.h> /* and */
18
45
#include <errno.h> /* errno */
19
46
#include <sys/wait.h> /* waitpid(), WIFEXITED(),
189
232
/* Wait for command to complete */
191
while(not interrupted_by_signal){
192
waitpid(splashy_command_pid, &status, 0);
193
if(not interrupted_by_signal
194
and WIFEXITED(status) and WEXITSTATUS(status)==0){
233
if(not interrupted_by_signal and splashy_command_pid != 0){
235
ret = waitpid(splashy_command_pid, &status, 0);
241
splashy_command_pid = 0;
244
/* The child process has exited */
245
splashy_command_pid = 0;
246
if(not interrupted_by_signal and WIFEXITED(status)
247
and WEXITSTATUS(status)==0){
198
252
kill(splashy_pid, SIGTERM);
199
if(interrupted_by_signal){
253
if(interrupted_by_signal and splashy_command_pid != 0){
200
254
kill(splashy_command_pid, SIGTERM);
257
while(kill(splashy_pid, 0) == 0){
258
kill(splashy_pid, SIGKILL);
203
261
pid_t new_splashy_pid = fork();
204
262
if(new_splashy_pid == 0){
205
263
/* Child; will become new splashy process */
206
while(kill(splashy_pid, 0)){
208
kill(splashy_pid, SIGKILL);
265
/* Make the effective user ID (root) the only user ID instead of
266
the real user ID (mandos) */
267
ret = setuid(geteuid());
274
/* if(fork() != 0){ */
275
/* _exit(EXIT_SUCCESS); */
211
277
ret = dup2(STDERR_FILENO, STDOUT_FILENO); /* replace our stdout */
214
280
_exit(EXIT_FAILURE);
216
283
execl("/sbin/splashy", "/sbin/splashy", "boot", (char *)NULL);
284
if(not interrupted_by_signal){
219
290
return EXIT_FAILURE;