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gnupg/kbx/keyboxd.c
NIIBE Yutaka 1d73806972
gpg,agent,kbx,sm,scd,tpm2d,g13: Use assuan_control. 
* agent/gpg-agent.c (thread_init_once): Call assuan_control.
* g10/gpg.c (main): Likewise.
* g13/g13.c (main): Likewise.
* kbx/keyboxd.c (thread_init_once): Likewise.
* scd/scdaemon.c (main): Likewise.
* sm/gpgsm.c (main): Likewise.
* tpm2d/tpm2daemon.c (main): Likewise.

--

GnuPG-bug-id: 6606
Signed-off-by: NIIBE Yutaka <gniibe@fsij.org>
2023-08-03 16:34:18 +09:00

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/* keyboxd.c - The GnuPG Keybox Daemon
* Copyright (C) 2000-2020 Free Software Foundation, Inc.
* Copyright (C) 2000-2019 Werner Koch
* Copyright (C) 2015-2020 g10 Code GmbH
*
* This file is part of GnuPG.
*
* GnuPG is free software; you can redistribute it and/or modify
* it under the terms of the GNU General Public License as published by
* the Free Software Foundation; either version 3 of the License, or
* (at your option) any later version.
*
* GnuPG is distributed in the hope that it will be useful,
* but WITHOUT ANY WARRANTY; without even the implied warranty of
* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
* GNU General Public License for more details.
*
* You should have received a copy of the GNU General Public License
* along with this program; if not, see <https://www.gnu.org/licenses/>.
* SPDX-License-Identifier: GPL-3.0+
*/
#include <config.h>
#include <stdio.h>
#include <stdlib.h>
#include <stddef.h>
#include <stdarg.h>
#include <string.h>
#include <errno.h>
#include <assert.h>
#include <time.h>
#include <fcntl.h>
#include <sys/stat.h>
#ifdef HAVE_W32_SYSTEM
# ifndef WINVER
# define WINVER 0x0500 /* Same as in common/sysutils.c */
# endif
# include <winsock2.h>
#else /*!HAVE_W32_SYSTEM*/
# include <sys/socket.h>
# include <sys/un.h>
#endif /*!HAVE_W32_SYSTEM*/
#include <unistd.h>
#ifdef HAVE_SIGNAL_H
# include <signal.h>
#endif
#include <npth.h>
#define INCLUDED_BY_MAIN_MODULE 1
#define GNUPG_COMMON_NEED_AFLOCAL
#include "keyboxd.h"
#include <assuan.h> /* Malloc hooks and socket wrappers. */
#include "../common/i18n.h"
#include "../common/sysutils.h"
#include "../common/asshelp.h"
#include "../common/init.h"
#include "../common/gc-opt-flags.h"
#include "../common/exechelp.h"
#include "../common/comopt.h"
#include "frontend.h"
/* Urrgs: Put this into a separate header - but it needs assuan.h first. */
extern int kbxd_assuan_log_monitor (assuan_context_t ctx, unsigned int cat,
const char *msg);
enum cmd_and_opt_values
{
aNull = 0,
oQuiet = 'q',
oVerbose = 'v',
oNoVerbose = 500,
aGPGConfList,
aGPGConfTest,
oOptions,
oDebug,
oDebugAll,
oDebugWait,
oNoGreeting,
oNoOptions,
oHomedir,
oNoDetach,
oStealSocket,
oLogFile,
oServer,
oDaemon,
oFakedSystemTime,
oListenBacklog,
oDisableCheckOwnSocket,
oDummy
};
static gpgrt_opt_t opts[] = {
ARGPARSE_c (aGPGConfList, "gpgconf-list", "@"),
ARGPARSE_c (aGPGConfTest, "gpgconf-test", "@"),
ARGPARSE_header (NULL, N_("Options used for startup")),
ARGPARSE_s_n (oDaemon, "daemon", N_("run in daemon mode (background)")),
ARGPARSE_s_n (oServer, "server", N_("run in server mode (foreground)")),
ARGPARSE_s_n (oNoDetach, "no-detach", N_("do not detach from the console")),
ARGPARSE_s_n (oStealSocket, "steal-socket", "@"),
ARGPARSE_s_s (oHomedir, "homedir", "@"),
ARGPARSE_conffile (oOptions, "options", N_("|FILE|read options from FILE")),
ARGPARSE_header ("Monitor", N_("Options controlling the diagnostic output")),
ARGPARSE_s_n (oVerbose, "verbose", N_("verbose")),
ARGPARSE_s_n (oQuiet, "quiet", N_("be somewhat more quiet")),
ARGPARSE_s_s (oDebug, "debug", "@"),
ARGPARSE_s_n (oDebugAll, "debug-all", "@"),
ARGPARSE_s_i (oDebugWait, "debug-wait", "@"),
ARGPARSE_s_s (oLogFile, "log-file", N_("use a log file for the server")),
ARGPARSE_header ("Configuration",
N_("Options controlling the configuration")),
ARGPARSE_s_n (oDisableCheckOwnSocket, "disable-check-own-socket", "@"),
ARGPARSE_s_s (oFakedSystemTime, "faked-system-time", "@"),
ARGPARSE_s_i (oListenBacklog, "listen-backlog", "@"),
ARGPARSE_end () /* End of list */
};
/* The list of supported debug flags. */
static struct debug_flags_s debug_flags [] =
{
{ DBG_MPI_VALUE , "mpi" },
{ DBG_CRYPTO_VALUE , "crypto" },
{ DBG_MEMORY_VALUE , "memory" },
{ DBG_CACHE_VALUE , "cache" },
{ DBG_MEMSTAT_VALUE, "memstat" },
{ DBG_HASHING_VALUE, "hashing" },
{ DBG_IPC_VALUE , "ipc" },
{ DBG_CLOCK_VALUE , "clock" },
{ DBG_LOOKUP_VALUE , "lookup" },
{ 77, NULL } /* 77 := Do not exit on "help" or "?". */
};
/* The timer tick used for housekeeping stuff. Note that on Windows
* we use a SetWaitableTimer seems to signal earlier than about 2
* seconds. Thus we use 4 seconds on all platforms.
* CHECK_OWN_SOCKET_INTERVAL defines how often we check
* our own socket in standard socket mode. If that value is 0 we
* don't check at all. All values are in seconds. */
# define TIMERTICK_INTERVAL (4)
# define CHECK_OWN_SOCKET_INTERVAL (60)
/* The list of open file descriptors at startup. Note that this list
* has been allocated using the standard malloc. */
#ifndef HAVE_W32_SYSTEM
static int *startup_fd_list;
#endif
/* The signal mask at startup and a flag telling whether it is valid. */
#ifdef HAVE_SIGPROCMASK
static sigset_t startup_signal_mask;
static int startup_signal_mask_valid;
#endif
/* Flag to indicate that a shutdown was requested. */
static int shutdown_pending;
/* Flag indicating to start the daemon even if one already runs. */
static int steal_socket;
/* Counter for the currently running own socket checks. */
static int check_own_socket_running;
/* Flag to indicate that we shall not watch our own socket. */
static int disable_check_own_socket;
/* Flag to inhibit socket removal in cleanup. */
static int inhibit_socket_removal;
/* Name of the communication socket used for client requests. */
static char *socket_name;
/* We need to keep track of the server's nonces (these are dummies for
* POSIX systems). */
static assuan_sock_nonce_t socket_nonce;
/* Value for the listen() backlog argument. We use the same value for
* all sockets - 64 is on current Linux half of the default maximum.
* Let's try this as default. Change at runtime with --listen-backlog. */
static int listen_backlog = 64;
/* Name of a config file, which will be reread on a HUP if it is not NULL. */
static char *config_filename;
/* Keep track of the current log file so that we can avoid updating
* the log file after a SIGHUP if it didn't changed. Malloced. */
static char *current_logfile;
/* This flag is true if the inotify mechanism for detecting the
* removal of the homedir is active. This flag is used to disable the
* alternative but portable stat based check. */
static int have_homedir_inotify;
/* Depending on how keyboxd was started, the homedir inotify watch may
* not be reliable. This flag is set if we assume that inotify works
* reliable. */
static int reliable_homedir_inotify;
/* Number of active connections. */
static int active_connections;
/* This object is used to dispatch progress messages from Libgcrypt to
* the right thread. Given that we will have at max only a few dozen
* connections at a time, using a linked list is the easiest way to
* handle this. */
struct progress_dispatch_s
{
struct progress_dispatch_s *next;
/* The control object of the connection. If this is NULL no
* connection is associated with this item and it is free for reuse
* by new connections. */
ctrl_t ctrl;
/* The thread id of (npth_self) of the connection. */
npth_t tid;
/* The callback set by the connection. This is similar to the
* Libgcrypt callback but with the control object passed as the
* first argument. */
void (*cb)(ctrl_t ctrl,
const char *what, int printchar,
int current, int total);
};
struct progress_dispatch_s *progress_dispatch_list;
/*
* Local prototypes.
*/
static char *create_socket_name (char *standard_name, int with_homedir);
static gnupg_fd_t create_server_socket (char *name, int cygwin,
assuan_sock_nonce_t *nonce);
static void create_directories (void);
static void kbxd_libgcrypt_progress_cb (void *data, const char *what,
int printchar,
int current, int total);
static void kbxd_init_default_ctrl (ctrl_t ctrl);
static void kbxd_deinit_default_ctrl (ctrl_t ctrl);
static void handle_connections (gnupg_fd_t listen_fd);
static void check_own_socket (void);
static int check_for_running_kbxd (int silent);
/*
* Functions.
*/
/* Allocate a string describing a library version by calling a GETFNC.
* This function is expected to be called only once. GETFNC is
* expected to have a semantic like gcry_check_version (). */
static char *
make_libversion (const char *libname, const char *(*getfnc)(const char*))
{
return xstrconcat (libname, " ", getfnc (NULL), NULL);
}
/* Return strings describing this program. The case values are
* described in Libgpg-error. The values here override the default
* values given by strusage. */
static const char *
my_strusage (int level)
{
static char *ver_gcry;
const char *p;
switch (level)
{
case 9: p = "GPL-3.0-or-later"; break;
case 11: p = "keyboxd (@GNUPG@)";
break;
case 13: p = VERSION; break;
case 14: p = GNUPG_DEF_COPYRIGHT_LINE; break;
case 17: p = PRINTABLE_OS_NAME; break;
/* TRANSLATORS: @EMAIL@ will get replaced by the actual bug
reporting address. This is so that we can change the
reporting address without breaking the translations. */
case 19: p = _("Please report bugs to <@EMAIL@>.\n"); break;
case 20:
if (!ver_gcry)
ver_gcry = make_libversion ("libgcrypt", gcry_check_version);
p = ver_gcry;
break;
case 1:
case 40: p = _("Usage: keyboxd [options] (-h for help)");
break;
case 41: p = _("Syntax: keyboxd [options] [command [args]]\n"
"Public key management for @GNUPG@\n");
break;
default: p = NULL;
}
return p;
}
/* Setup the debugging. Note that we don't fail here, because it is
* important to keep keyboxd running even after re-reading the options
* due to a SIGHUP. */
static void
set_debug (void)
{
if (opt.debug && !opt.verbose)
opt.verbose = 1;
if (opt.debug && opt.quiet)
opt.quiet = 0;
if (opt.debug & DBG_MPI_VALUE)
gcry_control (GCRYCTL_SET_DEBUG_FLAGS, 2);
if (opt.debug & DBG_CRYPTO_VALUE )
gcry_control (GCRYCTL_SET_DEBUG_FLAGS, 1);
gcry_control (GCRYCTL_SET_VERBOSITY, (int)opt.verbose);
if (opt.debug)
parse_debug_flag (NULL, &opt.debug, debug_flags);
}
/* Helper for cleanup to remove one socket with NAME. */
static void
remove_socket (char *name)
{
if (name && *name)
{
gnupg_remove (name);
*name = 0;
}
}
/* Cleanup code for this program. This is either called has an atexit
handler or directly. */
static void
cleanup (void)
{
static int done;
if (done)
return;
done = 1;
if (!inhibit_socket_removal)
remove_socket (socket_name);
}
/* Handle options which are allowed to be reset after program start.
* Return true when the current option in PARGS could be handled and
* false if not. As a special feature, passing a value of NULL for
* PARGS, resets the options to the default. REREAD should be set
* true if it is not the initial option parsing. */
static int
parse_rereadable_options (gpgrt_argparse_t *pargs, int reread)
{
if (!pargs)
{ /* reset mode */
opt.quiet = 0;
opt.verbose = 0;
opt.debug = 0;
disable_check_own_socket = 0;
return 1;
}
switch (pargs->r_opt)
{
case oQuiet: opt.quiet = 1; break;
case oVerbose: opt.verbose++; break;
case oDebug:
parse_debug_flag (pargs->r.ret_str, &opt.debug, debug_flags);
break;
case oDebugAll: opt.debug = ~0; break;
case oLogFile:
if (!reread)
return 0; /* not handled */
if (!current_logfile || !pargs->r.ret_str
|| strcmp (current_logfile, pargs->r.ret_str))
{
log_set_file (pargs->r.ret_str);
xfree (current_logfile);
current_logfile = xtrystrdup (pargs->r.ret_str);
}
break;
case oDisableCheckOwnSocket: disable_check_own_socket = 1; break;
default:
return 0; /* not handled */
}
return 1; /* handled */
}
/* Fixup some options after all have been processed. */
static void
finalize_rereadable_options (void)
{
}
static void
thread_init_once (void)
{
static int npth_initialized = 0;
if (!npth_initialized)
{
npth_initialized++;
npth_init ();
}
gpgrt_set_syscall_clamp (npth_unprotect, npth_protect);
/* Now that we have set the syscall clamp we need to tell Libgcrypt
* that it should get them from libgpg-error. Note that Libgcrypt
* has already been initialized but at that point nPth was not
* initialized and thus Libgcrypt could not set its system call
* clamp. */
gcry_control (GCRYCTL_REINIT_SYSCALL_CLAMP, 0, 0);
assuan_control (ASSUAN_CONTROL_REINIT_SYSCALL_CLAMP, NULL);
}
static void
initialize_modules (void)
{
thread_init_once ();
}
/* The main entry point. */
int
main (int argc, char **argv )
{
gpgrt_argparse_t pargs;
int orig_argc;
char **orig_argv;
char *last_configname = NULL;
char *configname = NULL;
int debug_argparser = 0;
int pipe_server = 0;
int is_daemon = 0;
int nodetach = 0;
char *logfile = NULL;
int gpgconf_list = 0;
int debug_wait = 0;
struct assuan_malloc_hooks malloc_hooks;
early_system_init ();
/* Before we do anything else we save the list of currently open
* file descriptors and the signal mask. This info is required to
* do the exec call properly. We don't need it on Windows. */
#ifndef HAVE_W32_SYSTEM
startup_fd_list = get_all_open_fds ();
#endif /*!HAVE_W32_SYSTEM*/
#ifdef HAVE_SIGPROCMASK
if (!sigprocmask (SIG_UNBLOCK, NULL, &startup_signal_mask))
startup_signal_mask_valid = 1;
#endif /*HAVE_SIGPROCMASK*/
/* Set program name etc. */
gpgrt_set_strusage (my_strusage);
log_set_prefix ("keyboxd", GPGRT_LOG_WITH_PREFIX|GPGRT_LOG_WITH_PID);
/* Make sure that our subsystems are ready. */
i18n_init ();
init_common_subsystems (&argc, &argv);
gcry_control (GCRYCTL_DISABLE_SECMEM, 0);
malloc_hooks.malloc = gcry_malloc;
malloc_hooks.realloc = gcry_realloc;
malloc_hooks.free = gcry_free;
assuan_set_malloc_hooks (&malloc_hooks);
assuan_set_gpg_err_source (GPG_ERR_SOURCE_DEFAULT);
assuan_sock_init ();
setup_libassuan_logging (&opt.debug, kbxd_assuan_log_monitor);
setup_libgcrypt_logging ();
gcry_set_progress_handler (kbxd_libgcrypt_progress_cb, NULL);
/* Set default options. */
parse_rereadable_options (NULL, 0); /* Reset them to default values. */
/* Check whether we have a config file on the commandline */
orig_argc = argc;
orig_argv = argv;
pargs.argc = &argc;
pargs.argv = &argv;
pargs.flags= (ARGPARSE_FLAG_KEEP | ARGPARSE_FLAG_NOVERSION);
while (gpgrt_argparse (NULL, &pargs, opts))
{
switch (pargs.r_opt)
{
case oDebug:
case oDebugAll:
debug_argparser++;
break;
case oHomedir:
gnupg_set_homedir (pargs.r.ret_str);
break;
}
}
/* Reset the flags. */
pargs.flags &= ~(ARGPARSE_FLAG_KEEP | ARGPARSE_FLAG_NOVERSION);
/* The configuraton directories for use by gpgrt_argparser. */
gpgrt_set_confdir (GPGRT_CONFDIR_SYS, gnupg_sysconfdir ());
gpgrt_set_confdir (GPGRT_CONFDIR_USER, gnupg_homedir ());
argc = orig_argc;
argv = orig_argv;
pargs.argc = &argc;
pargs.argv = &argv;
pargs.flags |= (ARGPARSE_FLAG_RESET
| ARGPARSE_FLAG_KEEP
| ARGPARSE_FLAG_SYS
| ARGPARSE_FLAG_USER);
while (gpgrt_argparser (&pargs, opts, "keyboxd" EXTSEP_S "conf"))
{
if (pargs.r_opt == ARGPARSE_CONFFILE)
{
if (debug_argparser)
log_info (_("reading options from '%s'\n"),
pargs.r_type? pargs.r.ret_str: "[cmdline]");
if (pargs.r_type)
{
xfree (last_configname);
last_configname = xstrdup (pargs.r.ret_str);
configname = last_configname;
}
else
configname = NULL;
continue;
}
if (parse_rereadable_options (&pargs, 0))
continue; /* Already handled */
switch (pargs.r_opt)
{
case aGPGConfList: gpgconf_list = 1; break;
case aGPGConfTest: gpgconf_list = 2; break;
case oDebugWait: debug_wait = pargs.r.ret_int; break;
case oNoGreeting: /* Dummy option. */ break;
case oNoVerbose: opt.verbose = 0; break;
case oNoOptions: break; /* no-options */
case oHomedir: gnupg_set_homedir (pargs.r.ret_str); break;
case oNoDetach: nodetach = 1; break;
case oStealSocket: steal_socket = 1; break;
case oLogFile: logfile = pargs.r.ret_str; break;
case oServer: pipe_server = 1; break;
case oDaemon: is_daemon = 1; break;
case oFakedSystemTime:
{
time_t faked_time = isotime2epoch (pargs.r.ret_str);
if (faked_time == (time_t)(-1))
faked_time = (time_t)strtoul (pargs.r.ret_str, NULL, 10);
gnupg_set_time (faked_time, 0);
}
break;
case oListenBacklog:
listen_backlog = pargs.r.ret_int;
break;
default:
if (configname)
pargs.err = ARGPARSE_PRINT_WARNING;
else
pargs.err = ARGPARSE_PRINT_ERROR;
break;
}
}
gpgrt_argparse (NULL, &pargs, NULL);
if (!last_configname)
config_filename = gpgrt_fnameconcat (gnupg_homedir (),
"keyboxd" EXTSEP_S "conf",
NULL);
else
{
config_filename = last_configname;
last_configname = NULL;
}
if (log_get_errorcount(0))
exit (2);
/* Get a default log file from common.conf. */
if (!logfile && !parse_comopt (GNUPG_MODULE_NAME_KEYBOXD, debug_argparser))
{
logfile = comopt.logfile;
comopt.logfile = NULL;
}
finalize_rereadable_options ();
/* Print a warning if an argument looks like an option. */
if (!opt.quiet && !(pargs.flags & ARGPARSE_FLAG_STOP_SEEN))
{
int i;
for (i=0; i < argc; i++)
if (argv[i][0] == '-' && argv[i][1] == '-')
log_info (_("Note: '%s' is not considered an option\n"), argv[i]);
}
#ifdef ENABLE_NLS
/* keyboxd usually does not output any messages because it runs in
* the background. For log files it is acceptable to have messages
* always encoded in utf-8. We switch here to utf-8, so that
* commands like --help still give native messages. It is far
* easier to switch only once instead of for every message and it
* actually helps when more then one thread is active (avoids an
* extra copy step). */
bind_textdomain_codeset (PACKAGE_GT, "UTF-8");
#endif
if (!pipe_server && !is_daemon && !gpgconf_list)
{
/* We have been called without any command and thus we merely
* check whether an instance of us is already running. We do
* this right here so that we don't clobber a logfile with this
* check but print the status directly to stderr. */
opt.debug = 0;
set_debug ();
check_for_running_kbxd (0);
kbxd_exit (0);
}
set_debug ();
if (atexit (cleanup))
{
log_error ("atexit failed\n");
cleanup ();
exit (1);
}
/* Try to create missing directories. */
create_directories ();
if (debug_wait && pipe_server)
{
thread_init_once ();
log_debug ("waiting for debugger - my pid is %u .....\n",
(unsigned int)getpid());
gnupg_sleep (debug_wait);
log_debug ("... okay\n");
}
if (gpgconf_list == 2)
kbxd_exit (0);
else if (gpgconf_list)
{
kbxd_exit (0);
}
/* Now start with logging to a file if this is desired. */
if (logfile)
{
log_set_file (logfile);
log_set_prefix (NULL, (GPGRT_LOG_WITH_PREFIX
| GPGRT_LOG_WITH_TIME
| GPGRT_LOG_WITH_PID));
current_logfile = xstrdup (logfile);
}
if (pipe_server)
{
/* This is the simple pipe based server */
ctrl_t ctrl;
initialize_modules ();
ctrl = xtrycalloc (1, sizeof *ctrl);
if (!ctrl)
{
log_error ("error allocating connection control data: %s\n",
strerror (errno) );
kbxd_exit (1);
}
kbxd_init_default_ctrl (ctrl);
/* kbxd_set_database (ctrl, "pubring.kbx", 0); */
kbxd_set_database (ctrl, "pubring.db", 0);
kbxd_start_command_handler (ctrl, GNUPG_INVALID_FD, 0);
kbxd_deinit_default_ctrl (ctrl);
xfree (ctrl);
}
else if (!is_daemon)
; /* NOTREACHED */
else
{ /* Regular daemon mode. */
gnupg_fd_t fd;
#ifndef HAVE_W32_SYSTEM
pid_t pid;
#endif
/* Create the sockets. */
socket_name = create_socket_name (KEYBOXD_SOCK_NAME, 1);
fd = create_server_socket (socket_name, 0, &socket_nonce);
fflush (NULL);
#ifdef HAVE_W32_SYSTEM
(void)nodetach;
initialize_modules ();
#else /*!HAVE_W32_SYSTEM*/
pid = fork ();
if (pid == (pid_t)-1)
{
log_fatal ("fork failed: %s\n", strerror (errno) );
exit (1);
}
else if (pid)
{ /* We are the parent */
/* Close the socket FD. */
close (fd);
/* The signal mask might not be correct right now and thus
* we restore it. That is not strictly necessary but some
* programs falsely assume a cleared signal mask. */
#ifdef HAVE_SIGPROCMASK
if (startup_signal_mask_valid)
{
if (sigprocmask (SIG_SETMASK, &startup_signal_mask, NULL))
log_error ("error restoring signal mask: %s\n",
strerror (errno));
}
else
log_info ("no saved signal mask\n");
#endif /*HAVE_SIGPROCMASK*/
*socket_name = 0; /* Don't let cleanup() remove the socket -
the child should do this from now on */
exit (0);
/*NOTREACHED*/
} /* End parent */
/*
* This is the child
*/
initialize_modules ();
/* Detach from tty and put process into a new session */
if (!nodetach)
{
int i;
unsigned int oldflags;
/* Close stdin, stdout and stderr unless it is the log stream */
for (i=0; i <= 2; i++)
{
if (!log_test_fd (i) && i != fd )
{
if ( ! close (i)
&& open ("/dev/null", i? O_WRONLY : O_RDONLY) == -1)
{
log_error ("failed to open '%s': %s\n",
"/dev/null", strerror (errno));
cleanup ();
exit (1);
}
}
}
if (setsid() == -1)
{
log_error ("setsid() failed: %s\n", strerror(errno) );
cleanup ();
exit (1);
}
log_get_prefix (&oldflags);
log_set_prefix (NULL, oldflags | GPGRT_LOG_RUN_DETACHED);
opt.running_detached = 1;
/* Because we don't support running a program on the command
* line we can assume that the inotify things works and thus
* we can avoid the regular stat calls. */
reliable_homedir_inotify = 1;
}
{
struct sigaction sa;
sa.sa_handler = SIG_IGN;
sigemptyset (&sa.sa_mask);
sa.sa_flags = 0;
sigaction (SIGPIPE, &sa, NULL);
}
#endif /*!HAVE_W32_SYSTEM*/
if (gnupg_chdir (gnupg_daemon_rootdir ()))
{
log_error ("chdir to '%s' failed: %s\n",
gnupg_daemon_rootdir (), strerror (errno));
exit (1);
}
{
ctrl_t ctrl;
ctrl = xtrycalloc (1, sizeof *ctrl);
if (!ctrl)
{
log_error ("error allocating connection control data: %s\n",
strerror (errno) );
kbxd_exit (1);
}
kbxd_init_default_ctrl (ctrl);
/* kbxd_set_database (ctrl, "pubring.kbx", 0); */
kbxd_set_database (ctrl, "pubring.db", 0);
kbxd_deinit_default_ctrl (ctrl);
xfree (ctrl);
}
log_info ("%s %s started\n", gpgrt_strusage(11), gpgrt_strusage(13));
handle_connections (fd);
assuan_sock_close (fd);
}
return 0;
}
/* Exit entry point. This function should be called instead of a
plain exit. */
void
kbxd_exit (int rc)
{
/* As usual we run our cleanup handler. */
cleanup ();
/* at this time a bit annoying */
if ((opt.debug & DBG_MEMSTAT_VALUE))
gcry_control (GCRYCTL_DUMP_MEMORY_STATS );
rc = rc? rc : log_get_errorcount(0)? 2 : 0;
exit (rc);
}
/* This is our callback function for gcrypt progress messages. It is
* set once at startup and dispatches progress messages to the
* corresponding threads of ours. */
static void
kbxd_libgcrypt_progress_cb (void *data, const char *what, int printchar,
int current, int total)
{
struct progress_dispatch_s *dispatch;
npth_t mytid = npth_self ();
(void)data;
for (dispatch = progress_dispatch_list; dispatch; dispatch = dispatch->next)
if (dispatch->ctrl && dispatch->tid == mytid)
break;
if (dispatch && dispatch->cb)
dispatch->cb (dispatch->ctrl, what, printchar, current, total);
}
/* If a progress dispatcher callback has been associated with the
* current connection unregister it. */
static void
unregister_progress_cb (void)
{
struct progress_dispatch_s *dispatch;
npth_t mytid = npth_self ();
for (dispatch = progress_dispatch_list; dispatch; dispatch = dispatch->next)
if (dispatch->ctrl && dispatch->tid == mytid)
break;
if (dispatch)
{
dispatch->ctrl = NULL;
dispatch->cb = NULL;
}
}
/* Setup a progress callback CB for the current connection. Using a
* CB of NULL disables the callback. */
void
kbxd_set_progress_cb (void (*cb)(ctrl_t ctrl, const char *what,
int printchar, int current, int total),
ctrl_t ctrl)
{
struct progress_dispatch_s *dispatch, *firstfree;
npth_t mytid = npth_self ();
firstfree = NULL;
for (dispatch = progress_dispatch_list; dispatch; dispatch = dispatch->next)
{
if (dispatch->ctrl && dispatch->tid == mytid)
break;
if (!dispatch->ctrl && !firstfree)
firstfree = dispatch;
}
if (!dispatch) /* None allocated: Reuse or allocate a new one. */
{
if (firstfree)
{
dispatch = firstfree;
}
else if ((dispatch = xtrycalloc (1, sizeof *dispatch)))
{
dispatch->next = progress_dispatch_list;
progress_dispatch_list = dispatch;
}
else
{
log_error ("error allocating new progress dispatcher slot: %s\n",
gpg_strerror (gpg_error_from_syserror ()));
return;
}
dispatch->ctrl = ctrl;
dispatch->tid = mytid;
}
dispatch->cb = cb;
}
/* Each thread has its own local variables conveyed by a control
* structure usually identified by an argument named CTRL. This
* function is called immediately after allocating the control
* structure. Its purpose is to setup the default values for that
* structure. Note that some values may have already been set. */
static void
kbxd_init_default_ctrl (ctrl_t ctrl)
{
ctrl->magic = SERVER_CONTROL_MAGIC;
}
/* Release all resources allocated by default in the control
structure. This is the counterpart to kbxd_init_default_ctrl. */
static void
kbxd_deinit_default_ctrl (ctrl_t ctrl)
{
if (!ctrl)
return;
kbxd_release_session_info (ctrl);
ctrl->magic = 0xdeadbeef;
unregister_progress_cb ();
xfree (ctrl->lc_messages);
}
/* Reread parts of the configuration. Note, that this function is
* obviously not thread-safe and should only be called from the PTH
* signal handler.
*
* Fixme: Due to the way the argument parsing works, we create a
* memory leak here for all string type arguments. There is currently
* no clean way to tell whether the memory for the argument has been
* allocated or points into the process's original arguments. Unless
* we have a mechanism to tell this, we need to live on with this. */
static void
reread_configuration (void)
{
gpgrt_argparse_t pargs;
char *twopart;
int dummy;
int logfile_seen = 0;
if (!config_filename)
goto finish; /* No config file. */
twopart = strconcat ("keyboxd" EXTSEP_S "conf" PATHSEP_S,
config_filename, NULL);
if (!twopart)
return; /* Out of core. */
parse_rereadable_options (NULL, 1); /* Start from the default values. */
memset (&pargs, 0, sizeof pargs);
dummy = 0;
pargs.argc = &dummy;
pargs.flags = (ARGPARSE_FLAG_KEEP
|ARGPARSE_FLAG_SYS
|ARGPARSE_FLAG_USER);
while (gpgrt_argparser (&pargs, opts, twopart))
{
if (pargs.r_opt == ARGPARSE_CONFFILE)
{
log_info (_("reading options from '%s'\n"),
pargs.r_type? pargs.r.ret_str: "[cmdline]");
}
else if (pargs.r_opt < -1)
pargs.err = ARGPARSE_PRINT_WARNING;
else /* Try to parse this option - ignore unchangeable ones. */
{
if (pargs.r_opt == oLogFile)
logfile_seen = 1;
parse_rereadable_options (&pargs, 1);
}
}
gpgrt_argparse (NULL, &pargs, NULL); /* Release internal state. */
xfree (twopart);
finalize_rereadable_options ();
set_debug ();
finish:
/* Get a default log file from common.conf. */
if (!logfile_seen && !parse_comopt (GNUPG_MODULE_NAME_KEYBOXD, !!opt.debug))
{
if (!current_logfile || !comopt.logfile
|| strcmp (current_logfile, comopt.logfile))
{
log_set_file (comopt.logfile);
xfree (current_logfile);
current_logfile = comopt.logfile? xtrystrdup (comopt.logfile) : NULL;
}
}
}
/* Return the file name of the socket we are using for requests. */
const char *
get_kbxd_socket_name (void)
{
const char *s = socket_name;
return (s && *s)? s : NULL;
}
/* Return the number of active connections. */
int
get_kbxd_active_connection_count (void)
{
return active_connections;
}
/* Create a name for the socket in the home directory as using
* STANDARD_NAME. We also check for valid characters as well as
* against a maximum allowed length for a Unix domain socket is done.
* The function terminates the process in case of an error. The
* function returns a pointer to an allocated string with the absolute
* name of the socket used. */
static char *
create_socket_name (char *standard_name, int with_homedir)
{
char *name;
if (with_homedir)
name = make_filename (gnupg_socketdir (), standard_name, NULL);
else
name = make_filename (standard_name, NULL);
if (strchr (name, PATHSEP_C))
{
log_error (("'%s' are not allowed in the socket name\n"), PATHSEP_S);
kbxd_exit (2);
}
return name;
}
/* Create a Unix domain socket with NAME. Returns the file descriptor
* or terminates the process in case of an error. If CYGWIN is set a
* Cygwin compatible socket is created (Windows only). */
static gnupg_fd_t
create_server_socket (char *name, int cygwin, assuan_sock_nonce_t *nonce)
{
struct sockaddr *addr;
struct sockaddr_un *unaddr;
socklen_t len;
gnupg_fd_t fd;
int rc;
fd = assuan_sock_new (AF_UNIX, SOCK_STREAM, 0);
if (fd == ASSUAN_INVALID_FD)
{
log_error (_("can't create socket: %s\n"), strerror (errno));
*name = 0; /* Inhibit removal of the socket by cleanup(). */
kbxd_exit (2);
}
if (cygwin)
assuan_sock_set_flag (fd, "cygwin", 1);
unaddr = xmalloc (sizeof *unaddr);
addr = (struct sockaddr*)unaddr;
if (assuan_sock_set_sockaddr_un (name, addr, NULL))
{
if (errno == ENAMETOOLONG)
log_error (_("socket name '%s' is too long\n"), name);
else
log_error ("error preparing socket '%s': %s\n",
name, gpg_strerror (gpg_error_from_syserror ()));
*name = 0; /* Inhibit removal of the socket by cleanup(). */
xfree (unaddr);
kbxd_exit (2);
}
len = SUN_LEN (unaddr);
rc = assuan_sock_bind (fd, addr, len);
if (rc == -1
&& (errno == EADDRINUSE
#ifdef HAVE_W32_SYSTEM
|| errno == EEXIST
#endif
))
{
/* Check whether a keyboxd is already running. */
if (!check_for_running_kbxd (1))
{
if (steal_socket)
log_info (N_("trying to steal socket from running %s\n"),
"keyboxd");
else
{
log_set_prefix (NULL, GPGRT_LOG_WITH_PREFIX);
log_set_file (NULL);
log_error (_("a keyboxd is already running - "
"not starting a new one\n"));
*name = 0; /* Inhibit removal of the socket by cleanup(). */
assuan_sock_close (fd);
xfree (unaddr);
kbxd_exit (2);
}
}
gnupg_remove (unaddr->sun_path);
rc = assuan_sock_bind (fd, addr, len);
}
if (rc != -1 && (rc=assuan_sock_get_nonce (addr, len, nonce)))
log_error (_("error getting nonce for the socket\n"));
if (rc == -1)
{
/* We use gpg_strerror here because it allows us to get strings
for some W32 socket error codes. */
log_error (_("error binding socket to '%s': %s\n"),
unaddr->sun_path, gpg_strerror (gpg_error_from_syserror ()));
assuan_sock_close (fd);
*name = 0; /* Inhibit removal of the socket by cleanup(). */
xfree (unaddr);
kbxd_exit (2);
}
if (gnupg_chmod (unaddr->sun_path, "-rwx"))
log_error (_("can't set permissions of '%s': %s\n"),
unaddr->sun_path, strerror (errno));
if (listen (FD2INT(fd), listen_backlog ) == -1)
{
log_error ("listen(fd,%d) failed: %s\n", listen_backlog, strerror (errno));
*name = 0; /* Inhibit removal of the socket by cleanup(). */
assuan_sock_close (fd);
xfree (unaddr);
kbxd_exit (2);
}
if (opt.verbose)
log_info (_("listening on socket '%s'\n"), unaddr->sun_path);
xfree (unaddr);
return fd;
}
/* Check that the directory for storing the public keys exists and
* create it if not. This function won't fail as it is only a
* convenience function and not strictly necessary. */
static void
create_public_keys_directory (const char *home)
{
char *fname;
struct stat statbuf;
fname = make_filename (home, GNUPG_PUBLIC_KEYS_DIR, NULL);
if (gnupg_stat (fname, &statbuf) && errno == ENOENT)
{
if (gnupg_mkdir (fname, "-rwxr-x"))
log_error (_("can't create directory '%s': %s\n"),
fname, strerror (errno) );
else if (!opt.quiet)
log_info (_("directory '%s' created\n"), fname);
}
if (gnupg_chmod (fname, "-rwxr-x"))
log_error (_("can't set permissions of '%s': %s\n"),
fname, strerror (errno));
xfree (fname);
}
/* Create the directory only if the supplied directory name is the
* same as the default one. This way we avoid to create arbitrary
* directories when a non-default home directory is used. To cope
* with HOME, we compare only the suffix if we see that the default
* homedir does start with a tilde. We don't stop here in case of
* problems because other functions will throw an error anyway.*/
static void
create_directories (void)
{
struct stat statbuf;
const char *defhome = standard_homedir ();
char *home;
home = make_filename (gnupg_homedir (), NULL);
if (gnupg_stat (home, &statbuf))
{
if (errno == ENOENT)
{
if (
#ifdef HAVE_W32_SYSTEM
( !compare_filenames (home, defhome) )
#else
(*defhome == '~'
&& (strlen (home) >= strlen (defhome+1)
&& !strcmp (home + strlen(home)
- strlen (defhome+1), defhome+1)))
|| (*defhome != '~' && !strcmp (home, defhome) )
#endif
)
{
if (gnupg_mkdir (home, "-rwx"))
log_error (_("can't create directory '%s': %s\n"),
home, strerror (errno) );
else
{
if (!opt.quiet)
log_info (_("directory '%s' created\n"), home);
}
}
}
else
log_error (_("stat() failed for '%s': %s\n"), home, strerror (errno));
}
else if ( !S_ISDIR(statbuf.st_mode))
{
log_error (_("can't use '%s' as home directory\n"), home);
}
else /* exists and is a directory. */
{
create_public_keys_directory (home);
}
xfree (home);
}
/* This is the worker for the ticker. It is called every few seconds
* and may only do fast operations. */
static void
handle_tick (void)
{
static time_t last_minute;
struct stat statbuf;
if (!last_minute)
last_minute = time (NULL);
/* Code to be run from time to time. */
#if CHECK_OWN_SOCKET_INTERVAL > 0
if (last_minute + CHECK_OWN_SOCKET_INTERVAL <= time (NULL))
{
check_own_socket ();
last_minute = time (NULL);
}
#endif
/* Check whether the homedir is still available. */
if (!shutdown_pending
&& (!have_homedir_inotify || !reliable_homedir_inotify)
&& gnupg_stat (gnupg_homedir (), &statbuf) && errno == ENOENT)
{
shutdown_pending = 1;
log_info ("homedir has been removed - shutting down\n");
}
}
/* A global function which allows us to call the reload stuff from
* other places too. This is only used when build for W32. */
void
kbxd_sighup_action (void)
{
log_info ("SIGHUP received - "
"re-reading configuration and flushing cache\n");
reread_configuration ();
}
/* A helper function to handle SIGUSR2. */
static void
kbxd_sigusr2_action (void)
{
if (opt.verbose)
log_info ("SIGUSR2 received - no action\n");
/* Nothing to do right now. */
}
#ifndef HAVE_W32_SYSTEM
/* The signal handler for this program. It is expected to be run in
* its own thread and not in the context of a signal handler. */
static void
handle_signal (int signo)
{
switch (signo)
{
case SIGHUP:
kbxd_sighup_action ();
break;
case SIGUSR1:
log_info ("SIGUSR1 received - printing internal information:\n");
/* Fixme: We need to see how to integrate pth dumping into our
logging system. */
/* pth_ctrl (PTH_CTRL_DUMPSTATE, log_get_stream ()); */
break;
case SIGUSR2:
kbxd_sigusr2_action ();
break;
case SIGTERM:
if (!shutdown_pending)
log_info ("SIGTERM received - shutting down ...\n");
else
log_info ("SIGTERM received - still %i open connections\n",
active_connections);
shutdown_pending++;
if (shutdown_pending > 2)
{
log_info ("shutdown forced\n");
log_info ("%s %s stopped\n", gpgrt_strusage(11), gpgrt_strusage(13) );
cleanup ();
kbxd_exit (0);
}
break;
case SIGINT:
log_info ("SIGINT received - immediate shutdown\n");
log_info( "%s %s stopped\n", gpgrt_strusage(11), gpgrt_strusage(13));
cleanup ();
kbxd_exit (0);
break;
default:
log_info ("signal %d received - no action defined\n", signo);
}
}
#endif
/* Check the nonce on a new connection. This is a NOP unless we
are using our Unix domain socket emulation under Windows. */
static int
check_nonce (ctrl_t ctrl, assuan_sock_nonce_t *nonce)
{
if (assuan_sock_check_nonce (ctrl->thread_startup.fd, nonce))
{
log_info (_("error reading nonce on fd %d: %s\n"),
FD_DBG (ctrl->thread_startup.fd), strerror (errno));
assuan_sock_close (ctrl->thread_startup.fd);
xfree (ctrl);
return -1;
}
else
return 0;
}
static void *
do_start_connection_thread (ctrl_t ctrl)
{
static unsigned int last_session_id;
unsigned int session_id;
active_connections++;
kbxd_init_default_ctrl (ctrl);
if (opt.verbose && !DBG_IPC)
log_info (_("handler 0x%lx for fd %d started\n"),
(unsigned long) npth_self(), FD_DBG (ctrl->thread_startup.fd));
session_id = ++last_session_id;
if (!session_id)
session_id = ++last_session_id;
kbxd_start_command_handler (ctrl, ctrl->thread_startup.fd, session_id);
if (opt.verbose && !DBG_IPC)
log_info (_("handler 0x%lx for fd %d terminated\n"),
(unsigned long) npth_self(), FD_DBG (ctrl->thread_startup.fd));
kbxd_deinit_default_ctrl (ctrl);
xfree (ctrl);
active_connections--;
return NULL;
}
/* This is the standard connection thread's main function. */
static void *
start_connection_thread (void *arg)
{
ctrl_t ctrl = arg;
if (check_nonce (ctrl, &socket_nonce))
{
log_error ("handler 0x%lx nonce check FAILED\n",
(unsigned long) npth_self());
return NULL;
}
return do_start_connection_thread (ctrl);
}
/* Connection handler loop. Wait for connection requests and spawn a
* thread after accepting a connection. */
static void
handle_connections (gnupg_fd_t listen_fd)
{
gpg_error_t err;
npth_attr_t tattr;
struct sockaddr_un paddr;
socklen_t plen;
fd_set fdset, read_fdset;
int ret;
gnupg_fd_t fd;
int nfd;
int saved_errno;
struct timespec abstime;
struct timespec curtime;
struct timespec timeout;
#ifdef HAVE_W32_SYSTEM
HANDLE events[2];
unsigned int events_set;
#endif
int sock_inotify_fd = -1;
int home_inotify_fd = -1;
struct {
const char *name;
void *(*func) (void *arg);
gnupg_fd_t l_fd;
} listentbl[] = {
{ "std", start_connection_thread },
};
ret = npth_attr_init(&tattr);
if (ret)
log_fatal ("error allocating thread attributes: %s\n", strerror (ret));
npth_attr_setdetachstate (&tattr, NPTH_CREATE_DETACHED);
#ifndef HAVE_W32_SYSTEM
npth_sigev_init ();
npth_sigev_add (SIGHUP);
npth_sigev_add (SIGUSR1);
npth_sigev_add (SIGUSR2);
npth_sigev_add (SIGINT);
npth_sigev_add (SIGTERM);
npth_sigev_fini ();
#else
events[0] = INVALID_HANDLE_VALUE;
#endif
if (disable_check_own_socket)
sock_inotify_fd = -1;
else if ((err = gnupg_inotify_watch_socket (&sock_inotify_fd, socket_name)))
{
if (gpg_err_code (err) != GPG_ERR_NOT_SUPPORTED)
log_info ("error enabling daemon termination by socket removal: %s\n",
gpg_strerror (err));
}
if (disable_check_own_socket)
home_inotify_fd = -1;
else if ((err = gnupg_inotify_watch_delete_self (&home_inotify_fd,
gnupg_homedir ())))
{
if (gpg_err_code (err) != GPG_ERR_NOT_SUPPORTED)
log_info ("error enabling daemon termination by homedir removal: %s\n",
gpg_strerror (err));
}
else
have_homedir_inotify = 1;
FD_ZERO (&fdset);
FD_SET (FD2INT (listen_fd), &fdset);
nfd = FD2NUM (listen_fd);
if (sock_inotify_fd != -1)
{
FD_SET (sock_inotify_fd, &fdset);
if (sock_inotify_fd > nfd)
nfd = sock_inotify_fd;
}
if (home_inotify_fd != -1)
{
FD_SET (home_inotify_fd, &fdset);
if (home_inotify_fd > nfd)
nfd = home_inotify_fd;
}
listentbl[0].l_fd = listen_fd;
npth_clock_gettime (&abstime);
abstime.tv_sec += TIMERTICK_INTERVAL;
for (;;)
{
/* Shutdown test. */
if (shutdown_pending)
{
if (!active_connections)
break; /* ready */
/* Do not accept new connections but keep on running the
* loop to cope with the timer events.
*
* Note that we do not close the listening socket because a
* client trying to connect to that socket would instead
* restart a new keyboxd instance - which is unlikely the
* intention of a shutdown. */
FD_ZERO (&fdset);
nfd = -1;
if (sock_inotify_fd != -1)
{
FD_SET (sock_inotify_fd, &fdset);
nfd = sock_inotify_fd;
}
if (home_inotify_fd != -1)
{
FD_SET (home_inotify_fd, &fdset);
if (home_inotify_fd > nfd)
nfd = home_inotify_fd;
}
}
read_fdset = fdset;
npth_clock_gettime (&curtime);
if (!(npth_timercmp (&curtime, &abstime, <)))
{
/* Timeout. */
handle_tick ();
npth_clock_gettime (&abstime);
abstime.tv_sec += TIMERTICK_INTERVAL;
}
npth_timersub (&abstime, &curtime, &timeout);
#ifndef HAVE_W32_SYSTEM
ret = npth_pselect (nfd+1, &read_fdset, NULL, NULL, &timeout,
npth_sigev_sigmask ());
saved_errno = errno;
{
int signo;
while (npth_sigev_get_pending (&signo))
handle_signal (signo);
}
#else
ret = npth_eselect (nfd+1, &read_fdset, NULL, NULL, &timeout,
events, &events_set);
saved_errno = errno;
/* This is valid even if npth_eselect returns an error. */
if ((events_set & 1))
kbxd_sigusr2_action ();
#endif
if (ret == -1 && saved_errno != EINTR)
{
log_error (_("npth_pselect failed: %s - waiting 1s\n"),
strerror (saved_errno));
gnupg_sleep (1);
continue;
}
if (ret <= 0)
{
/* Interrupt or timeout. Will be handled when calculating the
* next timeout. */
continue;
}
/* The inotify fds are set even when a shutdown is pending (see
* above). So we must handle them in any case. To avoid that
* they trigger a second time we close them immediately. */
if (sock_inotify_fd != -1
&& FD_ISSET (sock_inotify_fd, &read_fdset)
&& gnupg_inotify_has_name (sock_inotify_fd, KEYBOXD_SOCK_NAME))
{
shutdown_pending = 1;
close (sock_inotify_fd);
sock_inotify_fd = -1;
log_info ("socket file has been removed - shutting down\n");
}
if (home_inotify_fd != -1
&& FD_ISSET (home_inotify_fd, &read_fdset))
{
shutdown_pending = 1;
close (home_inotify_fd);
home_inotify_fd = -1;
log_info ("homedir has been removed - shutting down\n");
}
if (!shutdown_pending)
{
int idx;
ctrl_t ctrl;
npth_t thread;
for (idx=0; idx < DIM(listentbl); idx++)
{
if (listentbl[idx].l_fd == GNUPG_INVALID_FD)
continue;
if (!FD_ISSET (FD2INT (listentbl[idx].l_fd), &read_fdset))
continue;
plen = sizeof paddr;
fd = assuan_sock_accept (listentbl[idx].l_fd,
(struct sockaddr *)&paddr, &plen);
if (fd == GNUPG_INVALID_FD)
{
log_error ("accept failed for %s: %s\n",
listentbl[idx].name, strerror (errno));
}
else if ( !(ctrl = xtrycalloc (1, sizeof *ctrl)))
{
log_error ("error allocating connection data for %s: %s\n",
listentbl[idx].name, strerror (errno) );
assuan_sock_close (fd);
}
else
{
ctrl->thread_startup.fd = fd;
ret = npth_create (&thread, &tattr,
listentbl[idx].func, ctrl);
if (ret)
{
log_error ("error spawning connection handler for %s:"
" %s\n", listentbl[idx].name, strerror (ret));
assuan_sock_close (fd);
xfree (ctrl);
}
}
}
}
}
if (sock_inotify_fd != -1)
close (sock_inotify_fd);
if (home_inotify_fd != -1)
close (home_inotify_fd);
cleanup ();
log_info (_("%s %s stopped\n"), gpgrt_strusage(11), gpgrt_strusage(13));
npth_attr_destroy (&tattr);
}
/* Helper for check_own_socket. */
static gpg_error_t
check_own_socket_pid_cb (void *opaque, const void *buffer, size_t length)
{
membuf_t *mb = opaque;
put_membuf (mb, buffer, length);
return 0;
}
/* The thread running the actual check. We need to run this in a
* separate thread so that check_own_thread can be called from the
* timer tick. */
static void *
check_own_socket_thread (void *arg)
{
int rc;
char *sockname = arg;
assuan_context_t ctx = NULL;
membuf_t mb;
char *buffer;
check_own_socket_running++;
rc = assuan_new (&ctx);
if (rc)
{
log_error ("can't allocate assuan context: %s\n", gpg_strerror (rc));
goto leave;
}
assuan_set_flag (ctx, ASSUAN_NO_LOGGING, 1);
rc = assuan_socket_connect (ctx, sockname, (pid_t)(-1), 0);
if (rc)
{
log_error ("can't connect my own socket: %s\n", gpg_strerror (rc));
goto leave;
}
init_membuf (&mb, 100);
rc = assuan_transact (ctx, "GETINFO pid", check_own_socket_pid_cb, &mb,
NULL, NULL, NULL, NULL);
put_membuf (&mb, "", 1);
buffer = get_membuf (&mb, NULL);
if (rc || !buffer)
{
log_error ("sending command \"%s\" to my own socket failed: %s\n",
"GETINFO pid", gpg_strerror (rc));
rc = 1;
}
else if ( (pid_t)strtoul (buffer, NULL, 10) != getpid ())
{
log_error ("socket is now serviced by another server\n");
rc = 1;
}
else if (opt.verbose > 1)
log_error ("socket is still served by this server\n");
xfree (buffer);
leave:
xfree (sockname);
if (ctx)
assuan_release (ctx);
if (rc)
{
/* We may not remove the socket as it is now in use by another
* server. */
inhibit_socket_removal = 1;
shutdown_pending = 2;
log_info ("this process is useless - shutting down\n");
}
check_own_socket_running--;
return NULL;
}
/* Check whether we are still listening on our own socket. In case
* another keyboxd process started after us has taken ownership of our
* socket, we would linger around without any real task. Thus we
* better check once in a while whether we are really needed. */
static void
check_own_socket (void)
{
char *sockname;
npth_t thread;
npth_attr_t tattr;
int err;
if (disable_check_own_socket)
return;
if (check_own_socket_running || shutdown_pending)
return; /* Still running or already shutting down. */
sockname = make_filename_try (gnupg_socketdir (), KEYBOXD_SOCK_NAME, NULL);
if (!sockname)
return; /* Out of memory. */
err = npth_attr_init (&tattr);
if (err)
{
xfree (sockname);
return;
}
npth_attr_setdetachstate (&tattr, NPTH_CREATE_DETACHED);
err = npth_create (&thread, &tattr, check_own_socket_thread, sockname);
if (err)
log_error ("error spawning check_own_socket_thread: %s\n", strerror (err));
npth_attr_destroy (&tattr);
}
/* Figure out whether a keyboxd is available and running. Prints an
* error if not. If SILENT is true, no messages are printed. Returns
* 0 if the agent is running. */
static int
check_for_running_kbxd (int silent)
{
gpg_error_t err;
char *sockname;
assuan_context_t ctx = NULL;
sockname = make_filename_try (gnupg_socketdir (), KEYBOXD_SOCK_NAME, NULL);
if (!sockname)
return gpg_error_from_syserror ();
err = assuan_new (&ctx);
if (!err)
err = assuan_socket_connect (ctx, sockname, (pid_t)(-1), 0);
xfree (sockname);
if (err)
{
if (!silent)
log_error (_("no keyboxd running in this session\n"));
if (ctx)
assuan_release (ctx);
return -1;
}
if (!opt.quiet && !silent)
log_info ("keyboxd running and available\n");
assuan_release (ctx);
return 0;
}
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