Line data Source code
1 : /* asshelp.c - Helper functions for Assuan
2 : * Copyright (C) 2002, 2004, 2007, 2009, 2010 Free Software Foundation, Inc.
3 : *
4 : * This file is part of GnuPG.
5 : *
6 : * This file is free software; you can redistribute it and/or modify
7 : * it under the terms of either
8 : *
9 : * - the GNU Lesser General Public License as published by the Free
10 : * Software Foundation; either version 3 of the License, or (at
11 : * your option) any later version.
12 : *
13 : * or
14 : *
15 : * - the GNU General Public License as published by the Free
16 : * Software Foundation; either version 2 of the License, or (at
17 : * your option) any later version.
18 : *
19 : * or both in parallel, as here.
20 : *
21 : * This file is distributed in the hope that it will be useful,
22 : * but WITHOUT ANY WARRANTY; without even the implied warranty of
23 : * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
24 : * GNU General Public License for more details.
25 : *
26 : * You should have received a copy of the GNU General Public License
27 : * along with this program; if not, see <https://www.gnu.org/licenses/>.
28 : */
29 :
30 : #include <config.h>
31 : #include <stdio.h>
32 : #include <stdlib.h>
33 : #include <string.h>
34 : #include <unistd.h>
35 : #include <errno.h>
36 : #ifdef HAVE_LOCALE_H
37 : #include <locale.h>
38 : #endif
39 :
40 : #include "i18n.h"
41 : #include "util.h"
42 : #include "exechelp.h"
43 : #include "sysutils.h"
44 : #include "status.h"
45 : #include "membuf.h"
46 : #include "asshelp.h"
47 :
48 : /* The type we use for lock_agent_spawning. */
49 : #ifdef HAVE_W32_SYSTEM
50 : # define lock_spawn_t HANDLE
51 : #else
52 : # define lock_spawn_t dotlock_t
53 : #endif
54 :
55 : /* The time we wait until the agent or the dirmngr are ready for
56 : operation after we started them before giving up. */
57 : #ifdef HAVE_W32CE_SYSTEM
58 : # define SECS_TO_WAIT_FOR_AGENT 30
59 : # define SECS_TO_WAIT_FOR_DIRMNGR 30
60 : #else
61 : # define SECS_TO_WAIT_FOR_AGENT 5
62 : # define SECS_TO_WAIT_FOR_DIRMNGR 5
63 : #endif
64 :
65 : /* A bitfield that specifies the assuan categories to log. This is
66 : identical to the default log handler of libassuan. We need to do
67 : it ourselves because we use a custom log handler and want to use
68 : the same assuan variables to select the categories to log. */
69 : static int log_cats;
70 : #define TEST_LOG_CAT(x) (!! (log_cats & (1 << (x - 1))))
71 :
72 : /* The assuan log monitor used to temporary inhibit log messages from
73 : * assuan. */
74 : static int (*my_log_monitor) (assuan_context_t ctx,
75 : unsigned int cat,
76 : const char *msg);
77 :
78 :
79 : static int
80 49924 : my_libassuan_log_handler (assuan_context_t ctx, void *hook,
81 : unsigned int cat, const char *msg)
82 : {
83 : unsigned int dbgval;
84 :
85 49924 : if (! TEST_LOG_CAT (cat))
86 13227 : return 0;
87 :
88 36697 : dbgval = hook? *(unsigned int*)hook : 0;
89 36697 : if (!(dbgval & 1024))
90 36697 : return 0; /* Assuan debugging is not enabled. */
91 :
92 0 : if (ctx && my_log_monitor && !my_log_monitor (ctx, cat, msg))
93 0 : return 0; /* Temporary disabled. */
94 :
95 0 : if (msg)
96 0 : log_string (GPGRT_LOG_DEBUG, msg);
97 :
98 0 : return 1;
99 : }
100 :
101 :
102 : /* Setup libassuan to use our own logging functions. Should be used
103 : early at startup. */
104 : void
105 1234 : setup_libassuan_logging (unsigned int *debug_var_address,
106 : int (*log_monitor)(assuan_context_t ctx,
107 : unsigned int cat,
108 : const char *msg))
109 : {
110 : char *flagstr;
111 :
112 1234 : flagstr = getenv ("ASSUAN_DEBUG");
113 1234 : if (flagstr)
114 0 : log_cats = atoi (flagstr);
115 : else /* Default to log the control channel. */
116 1234 : log_cats = (1 << (ASSUAN_LOG_CONTROL - 1));
117 1234 : my_log_monitor = log_monitor;
118 1234 : assuan_set_log_cb (my_libassuan_log_handler, debug_var_address);
119 1234 : }
120 :
121 :
122 : /* Change the Libassuan log categories to those given by NEWCATS.
123 : NEWCATS is 0 the default category of ASSUAN_LOG_CONTROL is
124 : selected. Note, that setup_libassuan_logging overrides the values
125 : given here. */
126 : void
127 0 : set_libassuan_log_cats (unsigned int newcats)
128 : {
129 0 : if (newcats)
130 0 : log_cats = newcats;
131 : else /* Default to log the control channel. */
132 0 : log_cats = (1 << (ASSUAN_LOG_CONTROL - 1));
133 0 : }
134 :
135 :
136 :
137 : static gpg_error_t
138 1939 : send_one_option (assuan_context_t ctx, gpg_err_source_t errsource,
139 : const char *name, const char *value, int use_putenv)
140 : {
141 : gpg_error_t err;
142 : char *optstr;
143 :
144 : (void)errsource;
145 :
146 1939 : if (!value || !*value)
147 0 : err = 0; /* Avoid sending empty strings. */
148 1939 : else if (asprintf (&optstr, "OPTION %s%s=%s",
149 : use_putenv? "putenv=":"", name, value) < 0)
150 0 : err = gpg_error_from_syserror ();
151 : else
152 : {
153 1939 : err = assuan_transact (ctx, optstr, NULL, NULL, NULL, NULL, NULL, NULL);
154 1939 : xfree (optstr);
155 : }
156 :
157 1939 : return err;
158 : }
159 :
160 :
161 : /* Send the assuan commands pertaining to the pinentry environment. The
162 : OPT_* arguments are optional and may be used to override the
163 : defaults taken from the current locale. */
164 : gpg_error_t
165 624 : send_pinentry_environment (assuan_context_t ctx,
166 : gpg_err_source_t errsource,
167 : const char *opt_lc_ctype,
168 : const char *opt_lc_messages,
169 : session_env_t session_env)
170 :
171 : {
172 624 : gpg_error_t err = 0;
173 : #if defined(HAVE_SETLOCALE)
174 624 : char *old_lc = NULL;
175 : #endif
176 624 : char *dft_lc = NULL;
177 : const char *dft_ttyname;
178 : int iterator;
179 : const char *name, *assname, *value;
180 : int is_default;
181 :
182 624 : iterator = 0;
183 7488 : while ((name = session_env_list_stdenvnames (&iterator, &assname)))
184 : {
185 6240 : value = session_env_getenv_or_default (session_env, name, NULL);
186 6240 : if (!value)
187 4301 : continue;
188 :
189 1939 : if (assname)
190 1315 : err = send_one_option (ctx, errsource, assname, value, 0);
191 : else
192 : {
193 624 : err = send_one_option (ctx, errsource, name, value, 1);
194 624 : if (gpg_err_code (err) == GPG_ERR_UNKNOWN_OPTION)
195 0 : err = 0; /* Server too old; can't pass the new envvars. */
196 : }
197 1939 : if (err)
198 0 : return err;
199 : }
200 :
201 :
202 624 : dft_ttyname = session_env_getenv_or_default (session_env, "GPG_TTY",
203 : &is_default);
204 624 : if (dft_ttyname && !is_default)
205 0 : dft_ttyname = NULL; /* We need the default value. */
206 :
207 : /* Send the value for LC_CTYPE. */
208 : #if defined(HAVE_SETLOCALE) && defined(LC_CTYPE)
209 624 : old_lc = setlocale (LC_CTYPE, NULL);
210 624 : if (old_lc)
211 : {
212 624 : old_lc = xtrystrdup (old_lc);
213 624 : if (!old_lc)
214 0 : return gpg_error_from_syserror ();
215 : }
216 624 : dft_lc = setlocale (LC_CTYPE, "");
217 : #endif
218 624 : if (opt_lc_ctype || (dft_ttyname && dft_lc))
219 : {
220 0 : err = send_one_option (ctx, errsource, "lc-ctype",
221 : opt_lc_ctype ? opt_lc_ctype : dft_lc, 0);
222 : }
223 : #if defined(HAVE_SETLOCALE) && defined(LC_CTYPE)
224 624 : if (old_lc)
225 : {
226 624 : setlocale (LC_CTYPE, old_lc);
227 624 : xfree (old_lc);
228 : }
229 : #endif
230 624 : if (err)
231 0 : return err;
232 :
233 : /* Send the value for LC_MESSAGES. */
234 : #if defined(HAVE_SETLOCALE) && defined(LC_MESSAGES)
235 624 : old_lc = setlocale (LC_MESSAGES, NULL);
236 624 : if (old_lc)
237 : {
238 624 : old_lc = xtrystrdup (old_lc);
239 624 : if (!old_lc)
240 0 : return gpg_error_from_syserror ();
241 : }
242 624 : dft_lc = setlocale (LC_MESSAGES, "");
243 : #endif
244 624 : if (opt_lc_messages || (dft_ttyname && dft_lc))
245 : {
246 0 : err = send_one_option (ctx, errsource, "lc-messages",
247 : opt_lc_messages ? opt_lc_messages : dft_lc, 0);
248 : }
249 : #if defined(HAVE_SETLOCALE) && defined(LC_MESSAGES)
250 624 : if (old_lc)
251 : {
252 624 : setlocale (LC_MESSAGES, old_lc);
253 624 : xfree (old_lc);
254 : }
255 : #endif
256 624 : if (err)
257 0 : return err;
258 :
259 624 : return 0;
260 : }
261 :
262 :
263 : /* Lock a spawning process. The caller needs to provide the address
264 : of a variable to store the lock information and the name or the
265 : process. */
266 : static gpg_error_t
267 50 : lock_spawning (lock_spawn_t *lock, const char *homedir, const char *name,
268 : int verbose)
269 : {
270 : char *fname;
271 : (void)verbose;
272 :
273 50 : *lock = NULL;
274 :
275 50 : fname = make_absfilename_try
276 : (homedir,
277 50 : !strcmp (name, "agent")? "gnupg_spawn_agent_sentinel":
278 0 : !strcmp (name, "dirmngr")? "gnupg_spawn_dirmngr_sentinel":
279 : /* */ "gnupg_spawn_unknown_sentinel",
280 : NULL);
281 50 : if (!fname)
282 0 : return gpg_error_from_syserror ();
283 :
284 50 : *lock = dotlock_create (fname, 0);
285 50 : xfree (fname);
286 50 : if (!*lock)
287 0 : return gpg_error_from_syserror ();
288 :
289 : /* FIXME: We should use a timeout of 5000 here - however
290 : make_dotlock does not yet support values other than -1 and 0. */
291 50 : if (dotlock_take (*lock, -1))
292 0 : return gpg_error_from_syserror ();
293 :
294 50 : return 0;
295 : }
296 :
297 :
298 : /* Unlock the spawning process. */
299 : static void
300 50 : unlock_spawning (lock_spawn_t *lock, const char *name)
301 : {
302 50 : if (*lock)
303 : {
304 : (void)name;
305 50 : dotlock_destroy (*lock);
306 50 : *lock = NULL;
307 : }
308 50 : }
309 :
310 : /* Try to connect to the agent via socket or start it if it is not
311 : running and AUTOSTART is set. Handle the server's initial
312 : greeting. Returns a new assuan context at R_CTX or an error
313 : code. */
314 : gpg_error_t
315 624 : start_new_gpg_agent (assuan_context_t *r_ctx,
316 : gpg_err_source_t errsource,
317 : const char *agent_program,
318 : const char *opt_lc_ctype,
319 : const char *opt_lc_messages,
320 : session_env_t session_env,
321 : int autostart, int verbose, int debug,
322 : gpg_error_t (*status_cb)(ctrl_t, int, ...),
323 : ctrl_t status_cb_arg)
324 : {
325 : gpg_error_t err;
326 : assuan_context_t ctx;
327 624 : int did_success_msg = 0;
328 : char *sockname;
329 : const char *argv[6];
330 :
331 624 : *r_ctx = NULL;
332 :
333 624 : err = assuan_new (&ctx);
334 624 : if (err)
335 : {
336 0 : log_error ("error allocating assuan context: %s\n", gpg_strerror (err));
337 0 : return err;
338 : }
339 :
340 624 : sockname = make_filename_try (gnupg_socketdir (), GPG_AGENT_SOCK_NAME, NULL);
341 624 : if (!sockname)
342 : {
343 0 : err = gpg_err_make (errsource, gpg_err_code_from_syserror ());
344 0 : assuan_release (ctx);
345 0 : return err;
346 : }
347 :
348 624 : err = assuan_socket_connect (ctx, sockname, 0, 0);
349 624 : if (err && autostart)
350 : {
351 : char *abs_homedir;
352 : lock_spawn_t lock;
353 50 : char *program = NULL;
354 50 : const char *program_arg = NULL;
355 : char *p;
356 : const char *s;
357 : int i;
358 :
359 : /* With no success start a new server. */
360 50 : if (!agent_program || !*agent_program)
361 0 : agent_program = gnupg_module_name (GNUPG_MODULE_NAME_AGENT);
362 50 : else if ((s=strchr (agent_program, '|')) && s[1] == '-' && s[2]=='-')
363 : {
364 : /* Hack to insert an additional option on the command line. */
365 50 : program = xtrystrdup (agent_program);
366 50 : if (!program)
367 : {
368 0 : gpg_error_t tmperr = gpg_err_make (errsource,
369 : gpg_err_code_from_syserror ());
370 0 : xfree (sockname);
371 0 : assuan_release (ctx);
372 0 : return tmperr;
373 : }
374 50 : p = strchr (program, '|');
375 50 : *p++ = 0;
376 50 : program_arg = p;
377 : }
378 :
379 50 : if (verbose)
380 45 : log_info (_("no running gpg-agent - starting '%s'\n"),
381 : agent_program);
382 :
383 50 : if (status_cb)
384 0 : status_cb (status_cb_arg, STATUS_PROGRESS,
385 : "starting_agent ? 0 0", NULL);
386 :
387 : /* We better pass an absolute home directory to the agent just
388 : in case gpg-agent does not convert the passed name to an
389 : absolute one (which it should do). */
390 50 : abs_homedir = make_absfilename_try (gnupg_homedir (), NULL);
391 50 : if (!abs_homedir)
392 : {
393 0 : gpg_error_t tmperr = gpg_err_make (errsource,
394 : gpg_err_code_from_syserror ());
395 0 : log_error ("error building filename: %s\n",gpg_strerror (tmperr));
396 0 : xfree (sockname);
397 0 : assuan_release (ctx);
398 0 : xfree (program);
399 0 : return tmperr;
400 : }
401 :
402 50 : if (fflush (NULL))
403 : {
404 0 : gpg_error_t tmperr = gpg_err_make (errsource,
405 : gpg_err_code_from_syserror ());
406 0 : log_error ("error flushing pending output: %s\n",
407 0 : strerror (errno));
408 0 : xfree (sockname);
409 0 : assuan_release (ctx);
410 0 : xfree (abs_homedir);
411 0 : xfree (program);
412 0 : return tmperr;
413 : }
414 :
415 : /* If the agent has been configured for use with a standard
416 : socket, an environment variable is not required and thus
417 : we we can savely start the agent here. */
418 50 : i = 0;
419 50 : argv[i++] = "--homedir";
420 50 : argv[i++] = abs_homedir;
421 50 : argv[i++] = "--use-standard-socket";
422 50 : if (program_arg)
423 50 : argv[i++] = program_arg;
424 50 : argv[i++] = "--daemon";
425 50 : argv[i++] = NULL;
426 :
427 50 : if (!(err = lock_spawning (&lock, gnupg_homedir (), "agent", verbose))
428 50 : && assuan_socket_connect (ctx, sockname, 0, 0))
429 : {
430 50 : err = gnupg_spawn_process_detached (program? program : agent_program,
431 : argv, NULL);
432 50 : if (err)
433 0 : log_error ("failed to start agent '%s': %s\n",
434 : agent_program, gpg_strerror (err));
435 : else
436 : {
437 50 : for (i=0; i < SECS_TO_WAIT_FOR_AGENT; i++)
438 : {
439 50 : if (verbose)
440 45 : log_info (_("waiting for the agent to come up ... (%ds)\n"),
441 : SECS_TO_WAIT_FOR_AGENT - i);
442 50 : gnupg_sleep (1);
443 50 : err = assuan_socket_connect (ctx, sockname, 0, 0);
444 50 : if (!err)
445 : {
446 50 : if (verbose)
447 : {
448 45 : log_info (_("connection to agent established\n"));
449 45 : did_success_msg = 1;
450 : }
451 50 : break;
452 : }
453 : }
454 : }
455 : }
456 :
457 50 : unlock_spawning (&lock, "agent");
458 50 : xfree (abs_homedir);
459 50 : xfree (program);
460 : }
461 624 : xfree (sockname);
462 624 : if (err)
463 : {
464 0 : if (autostart || gpg_err_code (err) != GPG_ERR_ASS_CONNECT_FAILED)
465 0 : log_error ("can't connect to the agent: %s\n", gpg_strerror (err));
466 0 : assuan_release (ctx);
467 0 : return gpg_err_make (errsource, GPG_ERR_NO_AGENT);
468 : }
469 :
470 624 : if (debug && !did_success_msg)
471 0 : log_debug ("connection to agent established\n");
472 :
473 624 : err = assuan_transact (ctx, "RESET",
474 : NULL, NULL, NULL, NULL, NULL, NULL);
475 624 : if (!err)
476 : {
477 624 : err = send_pinentry_environment (ctx, errsource,
478 : opt_lc_ctype, opt_lc_messages,
479 : session_env);
480 624 : if (gpg_err_code (err) == GPG_ERR_FORBIDDEN
481 0 : && gpg_err_source (err) == GPG_ERR_SOURCE_GPGAGENT)
482 : {
483 : /* Check whether we are in restricted mode. */
484 0 : if (!assuan_transact (ctx, "GETINFO restricted",
485 : NULL, NULL, NULL, NULL, NULL, NULL))
486 : {
487 0 : if (verbose)
488 0 : log_info (_("connection to agent is in restricted mode\n"));
489 0 : err = 0;
490 : }
491 : }
492 : }
493 624 : if (err)
494 : {
495 0 : assuan_release (ctx);
496 0 : return err;
497 : }
498 :
499 624 : *r_ctx = ctx;
500 624 : return 0;
501 : }
502 :
503 :
504 : /* Try to connect to the dirmngr via a socket. On platforms
505 : supporting it, start it up if needed and if AUTOSTART is true.
506 : Returns a new assuan context at R_CTX or an error code. */
507 : gpg_error_t
508 0 : start_new_dirmngr (assuan_context_t *r_ctx,
509 : gpg_err_source_t errsource,
510 : const char *dirmngr_program,
511 : int autostart,
512 : int verbose, int debug,
513 : gpg_error_t (*status_cb)(ctrl_t, int, ...),
514 : ctrl_t status_cb_arg)
515 : {
516 : gpg_error_t err;
517 : assuan_context_t ctx;
518 : const char *sockname;
519 0 : int did_success_msg = 0;
520 :
521 0 : *r_ctx = NULL;
522 :
523 0 : err = assuan_new (&ctx);
524 0 : if (err)
525 : {
526 0 : log_error ("error allocating assuan context: %s\n", gpg_strerror (err));
527 0 : return err;
528 : }
529 :
530 0 : sockname = dirmngr_socket_name ();
531 0 : err = assuan_socket_connect (ctx, sockname, 0, 0);
532 :
533 : #ifdef USE_DIRMNGR_AUTO_START
534 0 : if (err && autostart)
535 : {
536 : lock_spawn_t lock;
537 : const char *argv[4];
538 : char *abs_homedir;
539 :
540 : /* No connection: Try start a new Dirmngr. */
541 0 : if (!dirmngr_program || !*dirmngr_program)
542 0 : dirmngr_program = gnupg_module_name (GNUPG_MODULE_NAME_DIRMNGR);
543 :
544 0 : if (verbose)
545 0 : log_info (_("no running Dirmngr - starting '%s'\n"),
546 : dirmngr_program);
547 :
548 0 : if (status_cb)
549 0 : status_cb (status_cb_arg, STATUS_PROGRESS,
550 : "starting_dirmngr ? 0 0", NULL);
551 :
552 0 : abs_homedir = make_absfilename (gnupg_homedir (), NULL);
553 0 : if (!abs_homedir)
554 : {
555 0 : gpg_error_t tmperr = gpg_err_make (errsource,
556 : gpg_err_code_from_syserror ());
557 0 : log_error ("error building filename: %s\n",gpg_strerror (tmperr));
558 0 : assuan_release (ctx);
559 0 : return tmperr;
560 : }
561 :
562 0 : if (fflush (NULL))
563 : {
564 0 : gpg_error_t tmperr = gpg_err_make (errsource,
565 : gpg_err_code_from_syserror ());
566 0 : log_error ("error flushing pending output: %s\n",
567 0 : strerror (errno));
568 0 : assuan_release (ctx);
569 0 : return tmperr;
570 : }
571 :
572 0 : argv[0] = "--daemon";
573 : /* Try starting the daemon. Versions of dirmngr < 2.1.15 do
574 : * this only if the home directory is given on the command line. */
575 0 : argv[1] = "--homedir";
576 0 : argv[2] = abs_homedir;
577 0 : argv[3] = NULL;
578 :
579 0 : if (!(err = lock_spawning (&lock, gnupg_homedir (), "dirmngr", verbose))
580 0 : && assuan_socket_connect (ctx, sockname, 0, 0))
581 : {
582 0 : err = gnupg_spawn_process_detached (dirmngr_program, argv, NULL);
583 0 : if (err)
584 0 : log_error ("failed to start the dirmngr '%s': %s\n",
585 : dirmngr_program, gpg_strerror (err));
586 : else
587 : {
588 : int i;
589 :
590 0 : for (i=0; i < SECS_TO_WAIT_FOR_DIRMNGR; i++)
591 : {
592 0 : if (verbose)
593 0 : log_info (_("waiting for the dirmngr "
594 : "to come up ... (%ds)\n"),
595 : SECS_TO_WAIT_FOR_DIRMNGR - i);
596 0 : gnupg_sleep (1);
597 0 : err = assuan_socket_connect (ctx, sockname, 0, 0);
598 0 : if (!err)
599 : {
600 0 : if (verbose)
601 : {
602 0 : log_info (_("connection to the dirmngr"
603 : " established\n"));
604 0 : did_success_msg = 1;
605 : }
606 0 : break;
607 : }
608 : }
609 : }
610 : }
611 :
612 0 : unlock_spawning (&lock, "dirmngr");
613 0 : xfree (abs_homedir);
614 : }
615 : #else
616 : (void)dirmngr_program;
617 : (void)verbose;
618 : (void)status_cb;
619 : (void)status_cb_arg;
620 : #endif /*USE_DIRMNGR_AUTO_START*/
621 :
622 0 : if (err)
623 : {
624 0 : if (autostart || gpg_err_code (err) != GPG_ERR_ASS_CONNECT_FAILED)
625 0 : log_error ("connecting dirmngr at '%s' failed: %s\n",
626 : sockname, gpg_strerror (err));
627 0 : assuan_release (ctx);
628 0 : return gpg_err_make (errsource, GPG_ERR_NO_DIRMNGR);
629 : }
630 :
631 0 : if (debug && !did_success_msg)
632 0 : log_debug ("connection to the dirmngr established\n");
633 :
634 0 : *r_ctx = ctx;
635 0 : return 0;
636 : }
637 :
638 :
639 : /* Return the version of a server using "GETINFO version". On success
640 : 0 is returned and R_VERSION receives a malloced string with the
641 : version which must be freed by the caller. On error NULL is stored
642 : at R_VERSION and an error code returned. Mode is in general 0 but
643 : certain values may be used to modify the used version command:
644 :
645 : MODE == 0 = Use "GETINFO version"
646 : MODE == 2 - Use "SCD GETINFO version"
647 : */
648 : gpg_error_t
649 535 : get_assuan_server_version (assuan_context_t ctx, int mode, char **r_version)
650 : {
651 : gpg_error_t err;
652 : membuf_t data;
653 :
654 535 : init_membuf (&data, 64);
655 535 : err = assuan_transact (ctx,
656 : mode == 2? "SCD GETINFO version"
657 : /**/ : "GETINFO version",
658 : put_membuf_cb, &data,
659 : NULL, NULL, NULL, NULL);
660 535 : if (err)
661 : {
662 0 : xfree (get_membuf (&data, NULL));
663 0 : *r_version = NULL;
664 : }
665 : else
666 : {
667 535 : put_membuf (&data, "", 1);
668 535 : *r_version = get_membuf (&data, NULL);
669 535 : if (!*r_version)
670 0 : err = gpg_error_from_syserror ();
671 : }
672 535 : return err;
673 : }
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