mirror of
git://git.gnupg.org/gnupg.git
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673 lines
20 KiB
C
673 lines
20 KiB
C
/* asshelp.c - Helper functions for Assuan
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* Copyright (C) 2002, 2004, 2007, 2009, 2010 Free Software Foundation, Inc.
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*
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* This file is part of GnuPG.
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*
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* GnuPG is free software; you can redistribute it and/or modify
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* it 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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* GnuPG is distributed in the hope that it will be useful,
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* but WITHOUT ANY WARRANTY; without even the implied warranty of
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* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
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* GNU 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 this program; if not, see <http://www.gnu.org/licenses/>.
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*/
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#include <config.h>
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#include <stdio.h>
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#include <stdlib.h>
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#include <string.h>
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#include <unistd.h>
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#include <errno.h>
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#ifdef HAVE_LOCALE_H
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#include <locale.h>
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#endif
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#define JNLIB_NEED_LOG_LOGV
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#include "i18n.h"
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#include "util.h"
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#include "exechelp.h"
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#include "sysutils.h"
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#include "status.h"
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#include "asshelp.h"
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/* The type we use for lock_agent_spawning. */
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#ifdef HAVE_W32_SYSTEM
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# define lock_spawn_t HANDLE
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#else
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# define lock_spawn_t dotlock_t
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#endif
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/* The time we wait until the agent or the dirmngr are ready for
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operation after we started them before giving up. */
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#ifdef HAVE_W32CE_SYSTEM
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# define SECS_TO_WAIT_FOR_AGENT 30
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# define SECS_TO_WAIT_FOR_DIRMNGR 30
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#else
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# define SECS_TO_WAIT_FOR_AGENT 5
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# define SECS_TO_WAIT_FOR_DIRMNGR 5
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#endif
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/* A bitfield that specifies the assuan categories to log. This is
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identical to the default log handler of libassuan. We need to do
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it ourselves because we use a custom log handler and want to use
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the same assuan variables to select the categories to log. */
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static int log_cats;
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#define TEST_LOG_CAT(x) (!! (log_cats & (1 << (x - 1))))
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static int
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my_libassuan_log_handler (assuan_context_t ctx, void *hook,
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unsigned int cat, const char *msg)
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{
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unsigned int dbgval;
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(void)ctx;
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if (! TEST_LOG_CAT (cat))
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return 0;
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dbgval = hook? *(unsigned int*)hook : 0;
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if (!(dbgval & 1024))
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return 0; /* Assuan debugging is not enabled. */
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if (msg)
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log_string (JNLIB_LOG_DEBUG, msg);
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return 1;
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}
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/* Setup libassuan to use our own logging functions. Should be used
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early at startup. */
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void
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setup_libassuan_logging (unsigned int *debug_var_address)
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{
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char *flagstr;
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flagstr = getenv ("ASSUAN_DEBUG");
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if (flagstr)
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log_cats = atoi (flagstr);
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else /* Default to log the control channel. */
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log_cats = (1 << (ASSUAN_LOG_CONTROL - 1));
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assuan_set_log_cb (my_libassuan_log_handler, debug_var_address);
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}
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static gpg_error_t
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send_one_option (assuan_context_t ctx, gpg_err_source_t errsource,
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const char *name, const char *value, int use_putenv)
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{
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gpg_error_t err;
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char *optstr;
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(void)errsource;
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if (!value || !*value)
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err = 0; /* Avoid sending empty strings. */
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else if (asprintf (&optstr, "OPTION %s%s=%s",
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use_putenv? "putenv=":"", name, value) < 0)
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err = gpg_error_from_syserror ();
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else
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{
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err = assuan_transact (ctx, optstr, NULL, NULL, NULL, NULL, NULL, NULL);
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xfree (optstr);
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}
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return err;
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}
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/* Send the assuan commands pertaining to the pinentry environment. The
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OPT_* arguments are optional and may be used to override the
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defaults taken from the current locale. */
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gpg_error_t
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send_pinentry_environment (assuan_context_t ctx,
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gpg_err_source_t errsource,
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const char *opt_lc_ctype,
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const char *opt_lc_messages,
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session_env_t session_env)
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{
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gpg_error_t err = 0;
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#if defined(HAVE_SETLOCALE)
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char *old_lc = NULL;
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#endif
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char *dft_lc = NULL;
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const char *dft_ttyname;
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int iterator;
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const char *name, *assname, *value;
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int is_default;
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iterator = 0;
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while ((name = session_env_list_stdenvnames (&iterator, &assname)))
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{
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value = session_env_getenv_or_default (session_env, name, NULL);
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if (!value)
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continue;
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if (assname)
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err = send_one_option (ctx, errsource, assname, value, 0);
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else
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{
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err = send_one_option (ctx, errsource, name, value, 1);
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if (gpg_err_code (err) == GPG_ERR_UNKNOWN_OPTION)
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err = 0; /* Server too old; can't pass the new envvars. */
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}
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if (err)
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return err;
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}
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dft_ttyname = session_env_getenv_or_default (session_env, "GPG_TTY",
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&is_default);
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if (dft_ttyname && !is_default)
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dft_ttyname = NULL; /* We need the default value. */
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/* Send the value for LC_CTYPE. */
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#if defined(HAVE_SETLOCALE) && defined(LC_CTYPE)
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old_lc = setlocale (LC_CTYPE, NULL);
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if (old_lc)
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{
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old_lc = xtrystrdup (old_lc);
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if (!old_lc)
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return gpg_error_from_syserror ();
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}
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dft_lc = setlocale (LC_CTYPE, "");
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#endif
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if (opt_lc_ctype || (dft_ttyname && dft_lc))
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{
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err = send_one_option (ctx, errsource, "lc-ctype",
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opt_lc_ctype ? opt_lc_ctype : dft_lc, 0);
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}
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#if defined(HAVE_SETLOCALE) && defined(LC_CTYPE)
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if (old_lc)
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{
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setlocale (LC_CTYPE, old_lc);
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xfree (old_lc);
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}
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#endif
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if (err)
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return err;
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/* Send the value for LC_MESSAGES. */
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#if defined(HAVE_SETLOCALE) && defined(LC_MESSAGES)
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old_lc = setlocale (LC_MESSAGES, NULL);
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if (old_lc)
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{
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old_lc = xtrystrdup (old_lc);
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if (!old_lc)
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return gpg_error_from_syserror ();
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}
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dft_lc = setlocale (LC_MESSAGES, "");
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#endif
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if (opt_lc_messages || (dft_ttyname && dft_lc))
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{
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err = send_one_option (ctx, errsource, "lc-messages",
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opt_lc_messages ? opt_lc_messages : dft_lc, 0);
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}
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#if defined(HAVE_SETLOCALE) && defined(LC_MESSAGES)
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if (old_lc)
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{
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setlocale (LC_MESSAGES, old_lc);
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xfree (old_lc);
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}
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#endif
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if (err)
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return err;
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return 0;
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}
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/* Lock a spawning process. The caller needs to provide the address
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of a variable to store the lock information and the name or the
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process. */
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static gpg_error_t
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lock_spawning (lock_spawn_t *lock, const char *homedir, const char *name,
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int verbose)
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{
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#ifdef HAVE_W32_SYSTEM
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int waitrc;
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int timeout = (!strcmp (name, "agent")
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? SECS_TO_WAIT_FOR_AGENT
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: SECS_TO_WAIT_FOR_DIRMNGR);
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(void)homedir; /* Not required. */
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*lock = CreateMutexW
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(NULL, FALSE,
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!strcmp (name, "agent")? L"GnuPG_spawn_agent_sentinel":
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!strcmp (name, "dirmngr")? L"GnuPG_spawn_dirmngr_sentinel":
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/* */ L"GnuPG_spawn_unknown_sentinel");
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if (!*lock)
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{
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log_error ("failed to create the spawn_%s mutex: %s\n",
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name, w32_strerror (-1));
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return gpg_error (GPG_ERR_GENERAL);
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}
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retry:
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waitrc = WaitForSingleObject (*lock, 1000);
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if (waitrc == WAIT_OBJECT_0)
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return 0;
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if (waitrc == WAIT_TIMEOUT && timeout)
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{
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timeout--;
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if (verbose)
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log_info ("another process is trying to start the %s ... (%ds)\n",
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name, timeout);
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goto retry;
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}
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if (waitrc == WAIT_TIMEOUT)
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log_info ("error waiting for the spawn_%s mutex: timeout\n", name);
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else
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log_info ("error waiting for the spawn_%s mutex: (code=%d) %s\n",
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name, waitrc, w32_strerror (-1));
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return gpg_error (GPG_ERR_GENERAL);
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#else /*!HAVE_W32_SYSTEM*/
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char *fname;
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(void)verbose;
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*lock = NULL;
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fname = make_filename
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(homedir,
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!strcmp (name, "agent")? "gnupg_spawn_agent_sentinel":
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!strcmp (name, "dirmngr")? "gnupg_spawn_dirmngr_sentinel":
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/* */ "gnupg_spawn_unknown_sentinel",
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NULL);
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if (!fname)
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return gpg_error_from_syserror ();
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*lock = dotlock_create (fname, 0);
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xfree (fname);
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if (!*lock)
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return gpg_error_from_syserror ();
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/* FIXME: We should use a timeout of 5000 here - however
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make_dotlock does not yet support values other than -1 and 0. */
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if (dotlock_take (*lock, -1))
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return gpg_error_from_syserror ();
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return 0;
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#endif /*!HAVE_W32_SYSTEM*/
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}
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/* Unlock the spawning process. */
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static void
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unlock_spawning (lock_spawn_t *lock, const char *name)
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{
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if (*lock)
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{
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#ifdef HAVE_W32_SYSTEM
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if (!ReleaseMutex (*lock))
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log_error ("failed to release the spawn_%s mutex: %s\n",
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name, w32_strerror (-1));
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CloseHandle (*lock);
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#else /*!HAVE_W32_SYSTEM*/
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(void)name;
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dotlock_destroy (*lock);
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#endif /*!HAVE_W32_SYSTEM*/
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*lock = NULL;
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}
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}
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/* Try to connect to the agent via socket or fork it off and work by
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pipes. Handle the server's initial greeting. Returns a new assuan
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context at R_CTX or an error code. */
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gpg_error_t
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start_new_gpg_agent (assuan_context_t *r_ctx,
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gpg_err_source_t errsource,
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const char *homedir,
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const char *agent_program,
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const char *opt_lc_ctype,
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const char *opt_lc_messages,
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session_env_t session_env,
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int verbose, int debug,
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gpg_error_t (*status_cb)(ctrl_t, int, ...),
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ctrl_t status_cb_arg)
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{
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/* If we ever failed to connect via a socket we will force the use
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of the pipe based server for the lifetime of the process. */
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static int force_pipe_server = 0;
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gpg_error_t err = 0;
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char *infostr, *p;
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assuan_context_t ctx;
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int did_success_msg = 0;
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*r_ctx = NULL;
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err = assuan_new (&ctx);
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if (err)
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{
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log_error ("error allocating assuan context: %s\n", gpg_strerror (err));
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return err;
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}
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restart:
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infostr = force_pipe_server? NULL : getenv ("GPG_AGENT_INFO");
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if (!infostr || !*infostr)
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{
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char *sockname;
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const char *argv[3];
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pid_t pid;
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int excode;
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/* First check whether we can connect at the standard
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socket. */
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sockname = make_filename (homedir, "S.gpg-agent", NULL);
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err = assuan_socket_connect (ctx, sockname, 0, 0);
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if (err)
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{
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/* With no success start a new server. */
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if (!agent_program || !*agent_program)
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agent_program = gnupg_module_name (GNUPG_MODULE_NAME_AGENT);
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if (verbose)
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log_info (_("no running gpg-agent - starting `%s'\n"),
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agent_program);
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if (status_cb)
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status_cb (status_cb_arg, STATUS_PROGRESS,
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"starting_agent ? 0 0", NULL);
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if (fflush (NULL))
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{
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gpg_error_t tmperr = gpg_err_make (errsource,
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gpg_err_code_from_syserror ());
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log_error ("error flushing pending output: %s\n",
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strerror (errno));
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xfree (sockname);
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assuan_release (ctx);
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return tmperr;
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}
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argv[0] = "--use-standard-socket-p";
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argv[1] = NULL;
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err = gnupg_spawn_process_fd (agent_program, argv, -1, -1, -1, &pid);
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if (err)
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log_debug ("starting `%s' for testing failed: %s\n",
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agent_program, gpg_strerror (err));
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else if ((err = gnupg_wait_process (agent_program, pid, 1, &excode)))
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{
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if (excode == -1)
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log_debug ("running `%s' for testing failed (wait): %s\n",
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agent_program, gpg_strerror (err));
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}
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gnupg_release_process (pid);
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if (!err && !excode)
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{
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/* If the agent has been configured for use with a
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standard socket, an environment variable is not
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required and thus we we can savely start the agent
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here. */
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lock_spawn_t lock;
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argv[0] = "--daemon";
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argv[1] = "--use-standard-socket";
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argv[2] = NULL;
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if (!(err = lock_spawning (&lock, homedir, "agent", verbose))
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&& assuan_socket_connect (ctx, sockname, 0, 0))
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{
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err = gnupg_spawn_process_detached (agent_program, argv,NULL);
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if (err)
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log_error ("failed to start agent `%s': %s\n",
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agent_program, gpg_strerror (err));
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else
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{
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int i;
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for (i=0; i < SECS_TO_WAIT_FOR_AGENT; i++)
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{
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if (verbose)
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log_info (_("waiting for the agent "
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"to come up ... (%ds)\n"),
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SECS_TO_WAIT_FOR_AGENT - i);
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gnupg_sleep (1);
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err = assuan_socket_connect (ctx, sockname, 0, 0);
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if (!err)
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{
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if (verbose)
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{
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log_info (_("connection to agent "
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"established\n"));
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did_success_msg = 1;
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}
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break;
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}
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}
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}
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}
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unlock_spawning (&lock, "agent");
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}
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else
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{
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/* If using the standard socket is not the default we
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start the agent as a pipe server which gives us most
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of the required features except for passphrase
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caching etc. */
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const char *pgmname;
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int no_close_list[3];
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int i;
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if ( !(pgmname = strrchr (agent_program, '/')))
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pgmname = agent_program;
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else
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pgmname++;
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argv[0] = pgmname;
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argv[1] = "--server";
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argv[2] = NULL;
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i=0;
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if (log_get_fd () != -1)
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no_close_list[i++] = assuan_fd_from_posix_fd (log_get_fd ());
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no_close_list[i++] = assuan_fd_from_posix_fd (fileno (stderr));
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no_close_list[i] = -1;
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/* Connect to the agent and perform initial handshaking. */
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err = assuan_pipe_connect (ctx, agent_program, argv,
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no_close_list, NULL, NULL, 0);
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}
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}
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xfree (sockname);
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}
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else
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{
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int prot;
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int pid;
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infostr = xstrdup (infostr);
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if ( !(p = strchr (infostr, PATHSEP_C)) || p == infostr)
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{
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log_error (_("malformed GPG_AGENT_INFO environment variable\n"));
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xfree (infostr);
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force_pipe_server = 1;
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goto restart;
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}
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*p++ = 0;
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pid = atoi (p);
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while (*p && *p != PATHSEP_C)
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p++;
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prot = *p? atoi (p+1) : 0;
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if (prot != 1)
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{
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log_error (_("gpg-agent protocol version %d is not supported\n"),
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prot);
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xfree (infostr);
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force_pipe_server = 1;
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goto restart;
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}
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err = assuan_socket_connect (ctx, infostr, pid, 0);
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xfree (infostr);
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if (gpg_err_code (err) == GPG_ERR_ASS_CONNECT_FAILED)
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{
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log_info (_("can't connect to the agent - trying fall back\n"));
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force_pipe_server = 1;
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goto restart;
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}
|
|
}
|
|
|
|
if (err)
|
|
{
|
|
log_error ("can't connect to the agent: %s\n", gpg_strerror (err));
|
|
assuan_release (ctx);
|
|
return gpg_err_make (errsource, GPG_ERR_NO_AGENT);
|
|
}
|
|
|
|
if (debug && !did_success_msg)
|
|
log_debug (_("connection to agent established\n"));
|
|
|
|
err = assuan_transact (ctx, "RESET",
|
|
NULL, NULL, NULL, NULL, NULL, NULL);
|
|
if (!err)
|
|
err = send_pinentry_environment (ctx, errsource,
|
|
opt_lc_ctype, opt_lc_messages,
|
|
session_env);
|
|
if (err)
|
|
{
|
|
assuan_release (ctx);
|
|
return err;
|
|
}
|
|
|
|
*r_ctx = ctx;
|
|
return 0;
|
|
}
|
|
|
|
|
|
/* Try to connect to the dirmngr via a socket. On platforms
|
|
supporting it, start it up if needed. Returns a new assuan context
|
|
at R_CTX or an error code. */
|
|
gpg_error_t
|
|
start_new_dirmngr (assuan_context_t *r_ctx,
|
|
gpg_err_source_t errsource,
|
|
const char *homedir,
|
|
const char *dirmngr_program,
|
|
int verbose, int debug,
|
|
gpg_error_t (*status_cb)(ctrl_t, int, ...),
|
|
ctrl_t status_cb_arg)
|
|
{
|
|
gpg_error_t err;
|
|
assuan_context_t ctx;
|
|
const char *sockname;
|
|
int did_success_msg = 0;
|
|
|
|
*r_ctx = NULL;
|
|
|
|
err = assuan_new (&ctx);
|
|
if (err)
|
|
{
|
|
log_error ("error allocating assuan context: %s\n", gpg_strerror (err));
|
|
return err;
|
|
}
|
|
|
|
sockname = dirmngr_socket_name ();
|
|
err = assuan_socket_connect (ctx, sockname, 0, 0);
|
|
#ifdef USE_DIRMNGR_AUTO_START
|
|
if (err)
|
|
{
|
|
lock_spawn_t lock;
|
|
const char *argv[2];
|
|
|
|
/* With no success try start a new Dirmngr. On most systems
|
|
this will fail because the Dirmngr is expected to be a system
|
|
service. However on Wince we don't distinguish users and
|
|
thus we can start it. A future extension might be to use the
|
|
userv system to start the Dirmngr as a system service. */
|
|
if (!dirmngr_program || !*dirmngr_program)
|
|
dirmngr_program = gnupg_module_name (GNUPG_MODULE_NAME_DIRMNGR);
|
|
|
|
if (verbose)
|
|
log_info (_("no running Dirmngr - starting `%s'\n"),
|
|
dirmngr_program);
|
|
|
|
if (status_cb)
|
|
status_cb (status_cb_arg, STATUS_PROGRESS,
|
|
"starting_dirmngr ? 0 0", NULL);
|
|
|
|
if (fflush (NULL))
|
|
{
|
|
gpg_error_t tmperr = gpg_err_make (errsource,
|
|
gpg_err_code_from_syserror ());
|
|
log_error ("error flushing pending output: %s\n",
|
|
strerror (errno));
|
|
assuan_release (ctx);
|
|
return tmperr;
|
|
}
|
|
|
|
argv[0] = "--daemon";
|
|
argv[1] = NULL;
|
|
|
|
if (!(err = lock_spawning (&lock, homedir, "dirmngr", verbose))
|
|
&& assuan_socket_connect (ctx, sockname, 0, 0))
|
|
{
|
|
err = gnupg_spawn_process_detached (dirmngr_program, argv,NULL);
|
|
if (err)
|
|
log_error ("failed to start the dirmngr `%s': %s\n",
|
|
dirmngr_program, gpg_strerror (err));
|
|
else
|
|
{
|
|
int i;
|
|
|
|
for (i=0; i < SECS_TO_WAIT_FOR_DIRMNGR; i++)
|
|
{
|
|
if (verbose)
|
|
log_info (_("waiting for the dirmngr "
|
|
"to come up ... (%ds)\n"),
|
|
SECS_TO_WAIT_FOR_DIRMNGR - i);
|
|
gnupg_sleep (1);
|
|
err = assuan_socket_connect (ctx, sockname, 0, 0);
|
|
if (!err)
|
|
{
|
|
if (verbose)
|
|
{
|
|
log_info (_("connection to the dirmngr"
|
|
" established\n"));
|
|
did_success_msg = 1;
|
|
}
|
|
break;
|
|
}
|
|
}
|
|
}
|
|
}
|
|
|
|
unlock_spawning (&lock, "dirmngr");
|
|
}
|
|
#else
|
|
(void)homedir;
|
|
(void)dirmngr_program;
|
|
(void)verbose;
|
|
(void)status_cb;
|
|
(void)status_cb_arg;
|
|
#endif /*USE_DIRMNGR_AUTO_START*/
|
|
|
|
if (err)
|
|
{
|
|
log_error ("connecting dirmngr at `%s' failed: %s\n",
|
|
sockname, gpg_strerror (err));
|
|
assuan_release (ctx);
|
|
return gpg_err_make (errsource, GPG_ERR_NO_DIRMNGR);
|
|
}
|
|
|
|
if (debug && !did_success_msg)
|
|
log_debug (_("connection to the dirmngr established\n"));
|
|
|
|
*r_ctx = ctx;
|
|
return 0;
|
|
}
|