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Hooks take new "modules" argument, and hook names can contain periods.

* debian/mandos-client.README.Debian: Adjust wording.
* debian/rules (binary-common): Exclude nework-hooks.d directory from
                                dh_fixperms.
* initramfs-tools-hook: Also create network hook directory.  Allow
                        periods in hook names.  Only run executable
                        files in hook directory.  Copy needed modules.
* network-hooks.d/bridge: Fix "/usr/bin/brctl" to "/usr/sbin/brctl".
                          Also take "modules" argument.
* plugins.d/mandos-client.xml (NETWORK HOOKS/REQUIREMENTS): Document
                                                            the
                                                            allowing
                                                            of periods
                                                            in hook
                                                            names.
  (NETWORK HOOKS/REQUIREMENTS/files): Adjust wording.
  (NETWORK HOOKS/REQUIREMENTS/modules): New.
  (NETWORK HOOKS/REQUIREMENTS/MANDOSNETHOOKDIR): Clarify.
  (NETWORK HOOKS/REQUIREMENTS/MODE): Add "modules".

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plugins.d/splashy.c
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/*
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 * Splashy - Read a password from splashy and output it
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 * 
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 * Copyright © 2008-2018, 2021-2022 Teddy Hogeborn
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 * Copyright © 2008-2018, 2021-2022 Björn Påhlsson
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 * 
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 * This file is part of Mandos.
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 * 
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 * Mandos is free software: you can redistribute it and/or modify it
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 * under the terms of the GNU General Public License as published by
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 * the Free Software Foundation, either version 3 of the License, or
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 * (at your option) any later version.
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 * 
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 * Mandos is distributed in the hope that it will be useful, but
 
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 * Copyright © 2008-2011 Teddy Hogeborn
 
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 * Copyright © 2008-2011 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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 * 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 Mandos.  If not, see <http://www.gnu.org/licenses/>.
 
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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@recompile.se>.
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 */
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#define _GNU_SOURCE             /* vasprintf(),
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                                   program_invocation_short_name,
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                                   asprintf(), TEMP_FAILURE_RETRY() */
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#include <sys/types.h>          /* sig_atomic_t, pid_t, setuid(),
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                                   geteuid(), setsid() */
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#include <stdarg.h>             /* va_list, va_start(), vfprintf() */
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#include <stdio.h>              /* vasprintf(), fprintf(), stderr,
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                                   vfprintf(), asprintf() */
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#include <errno.h>              /* program_invocation_short_name,
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                                   errno, EACCES, ENOTDIR, ELOOP,
 
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#define _GNU_SOURCE             /* TEMP_FAILURE_RETRY(), asprintf() */
 
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#include <signal.h>             /* sig_atomic_t, struct sigaction,
 
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                                   sigemptyset(), sigaddset(), SIGINT,
 
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                                   SIGHUP, SIGTERM, sigaction,
 
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                                   SIG_IGN, kill(), SIGKILL */
 
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#include <stddef.h>             /* NULL */
 
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#include <stdlib.h>             /* getenv() */
 
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#include <stdio.h>              /* asprintf(), vasprintf(), vprintf(),
 
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                                   fprintf() */
 
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#include <stdlib.h>             /* EXIT_FAILURE, free(),
 
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                                   EXIT_SUCCESS */
 
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#include <sys/types.h>          /* pid_t, DIR, struct dirent,
 
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                                   ssize_t */
 
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#include <dirent.h>             /* opendir(), readdir(), closedir() */
 
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#include <inttypes.h>           /* intmax_t, strtoimax() */
 
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#include <sys/stat.h>           /* struct stat, lstat(), S_ISLNK */
 
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#include <iso646.h>             /* not, or, and */
 
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#include <unistd.h>             /* readlink(), fork(), execl(),
 
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                                   sleep(), dup2() STDERR_FILENO,
 
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                                   STDOUT_FILENO, _exit(),
 
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                                   pause() */
 
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#include <string.h>             /* memcmp(), strerror() */
 
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#include <errno.h>              /* errno, EACCES, ENOTDIR, ELOOP,
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                                   ENOENT, ENAMETOOLONG, EMFILE,
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                                   ENFILE, ENOMEM, ENOEXEC, EINVAL,
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                                   E2BIG, EFAULT, EIO, ETXTBSY,
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                                   EISDIR, ELIBBAD, EPERM, EINTR,
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                                   ECHILD */
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#include <string.h>             /* strerror(), memcmp() */
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#include <error.h>              /* error() */
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#include <stdlib.h>             /* free(), EXIT_FAILURE, getenv(),
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                                   EXIT_SUCCESS, abort() */
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#include <stddef.h>             /* NULL */
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#include <dirent.h>             /* DIR, opendir(), struct dirent,
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                                   readdir(), closedir() */
 
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#include <sys/wait.h>           /* waitpid(), WIFEXITED(),
 
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                                   WEXITSTATUS() */
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#include <sysexits.h>           /* EX_OSERR, EX_OSFILE,
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                                   EX_UNAVAILABLE */
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#include <inttypes.h>           /* intmax_t, strtoimax() */
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#include <iso646.h>             /* or, not, and */
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#include <unistd.h>             /* ssize_t, readlink(), fork(),
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                                   execl(), _exit(),
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                                   TEMP_FAILURE_RETRY(), sleep(),
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                                   setuid(), geteuid(), setsid(),
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                                   chdir(), dup2(), STDERR_FILENO,
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                                   STDOUT_FILENO, pause() */
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#include <sys/stat.h>           /* struct stat, lstat(), S_ISLNK() */
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#include <signal.h>             /* struct sigaction, sigemptyset(),
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                                   sigaddset(), SIGINT, SIGHUP,
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                                   SIGTERM, SIG_IGN, kill(), SIGKILL,
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                                   SIG_DFL, raise() */
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#include <sys/wait.h>           /* waitpid(), WIFEXITED(),
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                                   WEXITSTATUS() */
 
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#include <stdarg.h>             /* va_list, va_start(), ... */
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sig_atomic_t interrupted_by_signal = 0;
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int signal_received;
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/* Function to use when printing errors */
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__attribute__((format (gnu_printf, 3, 4)))
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void error_plus(int status, int errnum, const char *formatstring,
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                ...){
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  va_list ap;
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  va_start(ap, formatstring);
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  ret = vasprintf(&text, formatstring, ap);
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  if(ret == -1){
 
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  if (ret == -1){
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    fprintf(stderr, "Mandos plugin %s: ",
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            program_invocation_short_name);
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    vfprintf(stderr, formatstring, ap);