1
/* -*- coding: utf-8 -*- */
3
* Usplash - Read a password from usplash 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/>.
26
1
#define _GNU_SOURCE /* asprintf() */
27
2
#include <signal.h> /* sig_atomic_t, struct sigaction,
28
3
sigemptyset(), sigaddset(), SIGINT,
30
5
SIG_IGN, kill(), SIGKILL */
31
6
#include <stdbool.h> /* bool, false, true */
32
7
#include <fcntl.h> /* open(), O_WRONLY, O_RDONLY */
33
#include <iso646.h> /* and, or, not*/
34
8
#include <errno.h> /* errno, EINTR */
35
#include <sys/types.h> /* size_t, ssize_t, pid_t, DIR, struct
9
#include <sys/types.h> /* size_t, ssize_t, pid_t, DIR,
37
11
#include <stddef.h> /* NULL */
38
12
#include <string.h> /* strlen(), memcmp() */
39
13
#include <stdio.h> /* asprintf(), perror() */
48
22
#include <stdlib.h> /* getenv() */
49
23
#include <dirent.h> /* opendir(), readdir(), closedir() */
50
#include <sys/stat.h> /* struct stat, lstat(), S_ISLNK */
27
#include <iso646.h> /* and */
28
#include <sys/wait.h> /* waitpid(), WIFEXITED(),
52
31
sig_atomic_t interrupted_by_signal = 0;
58
37
static bool usplash_write(const char *cmd, const char *arg){
60
* usplash_write("TIMEOUT", "15") will write "TIMEOUT 15\0"
61
* usplash_write("PULSATE", NULL) will write "PULSATE\0"
39
* usplash_write("TIMEOUT", "15"); -> "TIMEOUT 15\0"
40
* usplash_write("PULSATE", NULL); -> "PULSATE\0"
94
73
size_t written = 0;
96
74
while(not interrupted_by_signal and written < cmd_line_len){
97
sret = write(fifo_fd, cmd_line + written,
98
cmd_line_len - written);
75
ret = write(fifo_fd, cmd_line + written,
76
cmd_line_len - written);
100
78
if(errno != EINTR or interrupted_by_signal){
188
165
closedir(proc_dir);
189
166
return EXIT_FAILURE;
192
/* Check that it refers to a symlink owned by root:root */
193
struct stat exe_stat;
194
ret = lstat(exe_link, &exe_stat);
206
if(not S_ISLNK(exe_stat.st_mode)
207
or exe_stat.st_uid != 0
208
or exe_stat.st_gid != 0){
213
168
sret = readlink(exe_link, exe_target, sizeof(exe_target));
216
174
if((sret == ((ssize_t)sizeof(exe_target)-1))
217
175
and (memcmp(usplash_name, exe_target,
449
407
return EXIT_SUCCESS;
452
} /* end of non-loop while() */
454
412
/* If we got here, an error or interrupt must have happened */
456
/* Create argc and argv for new usplash*/
457
414
int cmdline_argc = 0;
458
415
char **cmdline_argv = malloc(sizeof(char *));
416
/* Create argv and argc for new usplash*/
460
418
size_t position = 0;
461
419
while(position < cmdline_len){
475
433
cmdline_argv[cmdline_argc] = NULL;
477
435
/* Kill old usplash */
478
kill(usplash_pid, SIGTERM);
436
kill(usplash_pid, SIGTERM);
480
438
while(kill(usplash_pid, 0) == 0){
481
439
kill(usplash_pid, SIGKILL);