src/libpwmd.c

   1 /* vim:tw=78:ts=8:sw=4:set ft=c:  */
   2 /*
   3     Copyright (C) 2006-2009 Ben Kibbey <bjk@luxsci.net>
   4
   5     This program is free software; you can redistribute it and/or modify
   6     it under the terms of the GNU General Public License as published by
   7     the Free Software Foundation; either version 2 of the License, or
   8     (at your option) any later version.
   9
  10     This program is distributed in the hope that it will be useful,
  11     but WITHOUT ANY WARRANTY; without even the implied warranty of
  12     MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
  13     GNU General Public License for more details.
  14
  15     You should have received a copy of the GNU General Public License
  16     along with this program; if not, write to the Free Software
  17     Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA  02110-1301  USA
  18 */
  19 #include <stdio.h>
  20 #include <stdlib.h>
  21 #include <unistd.h>
  22 #include <err.h>
  23 #include <errno.h>
  24 #include <ctype.h>
  25 #include <string.h>
  26 #include <sys/socket.h>
  27 #include <sys/un.h>
  28 #include <signal.h>
  29 #include <stdarg.h>
  30 #include <string.h>
  31 #include <sys/wait.h>
  32 #include <fcntl.h>
  33 #include <pwd.h>
  34 #include <time.h>
  35 #include <sys/types.h>
  36 #include <limits.h>
  37 #include <sys/select.h>
  38 #include <netdb.h>
  39 #include <netinet/in.h>
  40 #include <sys/socket.h>
  41 #include <libpwmd.h>
  42
  43 #ifdef HAVE_CONFIG_H
  44 #include <config.h>
  45 #endif
  46
  47 #ifdef WITH_LIBPTH
  48 #include <pth.h>
  49 #endif
  50
  51 #ifdef WITH_TCP
  52 #define DNS_USE_GETTIMEOFDAY_FOR_ID 1
  53 #include <ares.h>
  54 #include <arpa/nameser.h>
  55 #endif
  56
  57 #ifdef HAVE_ASSUAN_H
  58 #include <assuan.h>
  59 #endif
  60
  61 #ifdef HAVE_SETLOCALE
  62 #include <locale.h>
  63 #endif
  64
  65 #include "gettext.h"
  66 #define N_(msgid)       dgettext("libpwmd", msgid)
  67
  68 #include "mem.h"
  69 #include "types.h"
  70
  71 #ifdef WITH_PINENTRY
  72 static pwm_t *gpwm;
  73 static int gelapsed, gtimeout;
  74 static gpg_error_t pinentry_command(pwm_t *pwm, char **result, const char *cmd);
  75 #endif
  76
  77 static char *_getpwuid(struct passwd *pwd)
  78 {
  79     size_t size = sysconf(_SC_GETPW_R_SIZE_MAX);
  80     struct passwd *result;
  81     char *buf;
  82     int n;
  83
  84     if (size == -1)
  85         size = 16384;
  86
  87     buf = pwmd_malloc(size);
  88
  89     if (!buf)
  90         return NULL;
  91
  92     n = getpwuid_r(getuid(), pwd, buf, size, &result);
  93
  94     if (n) {
  95         pwmd_free(buf);
  96         errno = n;
  97         return NULL;
  98     }
  99
 100     if (!result) {
 101         pwmd_free(buf);
 102         return NULL;
 103     }
 104
 105     errno = n;
 106     return buf;
 107 }
 108
 109 const char *_pwmd_strerror(gpg_error_t e)
 110 {
 111     gpg_err_code_t code = gpg_err_code(e);
 112
 113     if (code >= GPG_ERR_USER_1 && code < gpg_err_code(EPWMD_MAX)) {
 114         switch (code) {
 115             default:
 116                 return NULL;
 117             case GPG_ERR_USER_1:
 118                 return N_("Unknown error");
 119             case GPG_ERR_USER_2:
 120                 return N_("No cache slots available");
 121             case GPG_ERR_USER_3:
 122                 return N_("Recursion loop");
 123             case GPG_ERR_USER_4:
 124                 return N_("No file is open");
 125             case GPG_ERR_USER_5:
 126                 return N_("General LibXML error");
 127             case GPG_ERR_USER_6:
 128                 return N_("File modified");
 129             case GPG_ERR_USER_7:
 130                 return N_("Access denied");
 131         }
 132     }
 133
 134     return NULL;
 135 }
 136
 137 const char *pwmd_strerror(gpg_error_t e)
 138 {
 139     const char *p = _pwmd_strerror(e);
 140
 141     return p ? p : gpg_strerror(e);
 142 }
 143
 144 int pwmd_strerror_r(gpg_error_t e, char *buf, size_t size)
 145 {
 146     const char *p = _pwmd_strerror(e);
 147
 148     if (p) {
 149         snprintf(buf, size, "%s", p);
 150
 151         if (strlen(p) > size)
 152             return ERANGE;
 153
 154         return 0;
 155     }
 156
 157     return gpg_strerror_r(e, buf, size);
 158 }
 159
 160 gpg_error_t pwmd_init()
 161 {
 162     static int initialized;
 163
 164     if (initialized)
 165         return 0;
 166
 167 #ifndef MEM_DEBUG
 168     xmem_init();
 169 #endif
 170 #ifdef ENABLE_NLS
 171     bindtextdomain("libpwmd", LOCALEDIR);
 172 #endif
 173     gpg_err_init();
 174     assuan_set_malloc_hooks(pwmd_malloc, pwmd_realloc, pwmd_free);
 175     assuan_set_assuan_err_source(GPG_ERR_SOURCE_DEFAULT);
 176     initialized = 1;
 177     return 0;
 178 }
 179
 180 static gpg_error_t _socket_connect_finalize(pwm_t *pwm)
 181 {
 182     int active[2];
 183     int n = assuan_get_active_fds(pwm->ctx, 0, active, N_ARRAY(active));
 184
 185     pwm->fd = n <= 0 ? -1 : dup(active[0]);
 186 #ifdef WITH_PINENTRY
 187     pwm->pid = -1;
 188     pwm->pinentry_tries = 3;
 189 #endif
 190     assuan_set_pointer(pwm->ctx, pwm);
 191
 192     if (pwm->name)
 193         return pwmd_command(pwm, NULL, "OPTION CLIENT NAME=%s", pwm->name);
 194
 195     return 0;
 196 }
 197
 198 #ifdef WITH_TCP
 199 static int read_hook(assuan_context_t ctx, assuan_fd_t fd, void *data,
 200         size_t len, ssize_t *ret)
 201 {
 202     pwm_t *pwm = assuan_get_pointer(ctx);
 203
 204     if (!pwm || !pwm->tcp_conn)
 205 #ifdef WITH_LIBPTH
 206         *ret = pth_read((int)fd, data, len);
 207 #else
 208         *ret = read((int)fd, data, len);
 209 #endif
 210     else {
 211         do {
 212             *ret = libssh2_channel_read(pwm->tcp_conn->channel, data, len);
 213         } while (*ret == LIBSSH2_ERROR_EAGAIN);
 214     }
 215
 216     return *ret <= 0 ? 0 : 1;
 217 }
 218
 219 static int write_hook(assuan_context_t ctx, assuan_fd_t fd, const void *data,
 220         size_t len, ssize_t *ret)
 221 {
 222     pwm_t *pwm = assuan_get_pointer(ctx);
 223
 224     if (!pwm || !pwm->tcp_conn)
 225 #ifdef WITH_LIBPTH
 226         *ret = pth_write((int)fd, data, len);
 227 #else
 228         *ret = write((int)fd, data, len);
 229 #endif
 230     else {
 231         do {
 232             *ret = libssh2_channel_write(pwm->tcp_conn->channel, data, len);
 233         } while (*ret == LIBSSH2_ERROR_EAGAIN);
 234     }
 235
 236     return *ret <= 0 ? 0 : 1;
 237 }
 238
 239 static void _ssh_deinit(pwmd_tcp_conn_t *conn);
 240 static void free_tcp_conn(pwmd_tcp_conn_t *conn)
 241 {
 242     if (!conn)
 243         return;
 244
 245     if (conn->username) {
 246         pwmd_free(conn->username);
 247         conn->username = NULL;
 248     }
 249
 250     if (conn->known_hosts) {
 251         pwmd_free(conn->known_hosts);
 252         conn->known_hosts = NULL;
 253     }
 254
 255     if (conn->identity) {
 256         pwmd_free(conn->identity);
 257         conn->identity = NULL;
 258     }
 259
 260     if (conn->identity_pub) {
 261         pwmd_free(conn->identity_pub);
 262         conn->identity_pub = NULL;
 263     }
 264
 265     if (conn->host) {
 266         pwmd_free(conn->host);
 267         conn->host = NULL;
 268     }
 269
 270     if (conn->hostkey) {
 271         pwmd_free(conn->hostkey);
 272         conn->hostkey = NULL;
 273     }
 274
 275     if (conn->chan) {
 276         ares_destroy(conn->chan);
 277         conn->chan = NULL;
 278     }
 279
 280     if (conn->he) {
 281         ares_free_hostent(conn->he);
 282         conn->he = NULL;
 283     }
 284
 285     if (conn->fd >= 0) {
 286         close(conn->fd);
 287         conn->fd = -1;
 288     }
 289
 290     if (conn->session)
 291         _ssh_deinit(conn);
 292     else
 293         pwmd_free(conn);
 294 }
 295
 296 static void _ssh_deinit(pwmd_tcp_conn_t *conn)
 297 {
 298     if (!conn)
 299         return;
 300
 301     if (conn->channel)
 302         libssh2_channel_free(conn->channel);
 303
 304     if (conn->session) {
 305         libssh2_session_disconnect(conn->session, "Bye!");
 306         libssh2_session_free(conn->session);
 307     }
 308
 309     conn->session = NULL;
 310     conn->channel = NULL;
 311     free_tcp_conn(conn);
 312 }
 313
 314 static void _ssh_assuan_deinit(assuan_context_t ctx)
 315 {
 316     pwm_t *pwm = assuan_get_pointer(ctx);
 317
 318     _ssh_deinit(pwm->tcp_conn);
 319     pwm->tcp_conn = NULL;
 320 }
 321
 322 /*
 323  * Sets common options from both pwmd_tcp_connect() and
 324  * pwmd_tcp_connect_async().
 325  */
 326 static gpg_error_t init_tcp_conn(pwmd_tcp_conn_t **dst, const char *host,
 327         int port, const char *identity, const char *user, const char *hosts,
 328         int get)
 329 {
 330     pwmd_tcp_conn_t *conn;
 331     gpg_error_t rc = 0;
 332
 333     if (get) {
 334         if (!host)
 335             return GPG_ERR_INV_ARG;
 336     }
 337     else {
 338         if (!host || !identity || !hosts)
 339             return GPG_ERR_INV_ARG;
 340     }
 341
 342     conn = pwmd_calloc(1, sizeof(pwmd_tcp_conn_t));
 343
 344     if (!conn)
 345         return gpg_error_from_errno(ENOMEM);
 346
 347     conn->port = port == -1 ? 22 : port;
 348     conn->host = pwmd_strdup(host);
 349
 350     if (!conn->host) {
 351         rc = gpg_error_from_errno(ENOMEM);
 352         goto fail;
 353     }
 354
 355     if (!get) {
 356         struct passwd pw;
 357         char *pwbuf = _getpwuid(&pw);
 358
 359         if (!pwbuf) {
 360             rc = gpg_error_from_errno(errno);
 361             goto fail;
 362         }
 363
 364         conn->username = pwmd_strdup(user ? user : pw.pw_name);
 365         pwmd_free(pwbuf);
 366
 367         if (!conn->username) {
 368             rc = gpg_error_from_errno(ENOMEM);
 369             goto fail;
 370         }
 371
 372         conn->identity = pwmd_strdup(identity);
 373
 374         if (!conn->identity) {
 375             rc = gpg_error_from_errno(ENOMEM);
 376             goto fail;
 377         }
 378
 379         conn->identity_pub = pwmd_malloc(strlen(conn->identity)+5);
 380
 381         if (!conn->identity_pub) {
 382             rc = gpg_error_from_errno(ENOMEM);
 383             goto fail;
 384         }
 385
 386         sprintf(conn->identity_pub, "%s.pub", conn->identity);
 387         conn->known_hosts = pwmd_strdup(hosts);
 388
 389         if (!conn->known_hosts) {
 390             rc = gpg_error_from_errno(ENOMEM);
 391             goto fail;
 392         }
 393     }
 394
 395     *dst = conn;
 396     return 0;
 397
 398 fail:
 399     free_tcp_conn(conn);
 400     return rc;
 401 }
 402
 403 static gpg_error_t do_connect(pwm_t *pwm, int prot, void *addr)
 404 {
 405     struct sockaddr_in their_addr;
 406
 407     pwm->tcp_conn->fd = socket(prot, SOCK_STREAM, 0);
 408
 409     if (pwm->tcp_conn->fd == -1)
 410         return gpg_error_from_syserror();
 411
 412     if (pwm->tcp_conn->async)
 413         fcntl(pwm->tcp_conn->fd, F_SETFL, O_NONBLOCK);
 414
 415     pwm->cmd = ASYNC_CMD_CONNECT;
 416     their_addr.sin_family = prot;
 417     their_addr.sin_port = htons(pwm->tcp_conn->port);
 418     their_addr.sin_addr = *((struct in_addr *)addr);
 419     memset(their_addr.sin_zero, '\0', sizeof their_addr.sin_zero);
 420
 421 #ifdef WITH_LIBPTH
 422     if (pth_connect(pwm->tcp_conn->fd, (struct sockaddr *)&their_addr,
 423                 sizeof(their_addr)) == -1)
 424 #else
 425     if (connect(pwm->tcp_conn->fd, (struct sockaddr *)&their_addr,
 426                 sizeof(their_addr)) == -1)
 427 #endif
 428         return gpg_error_from_syserror();
 429
 430     return 0;
 431 }
 432
 433 static gpg_error_t ares_error_to_pwmd(int status)
 434 {
 435     if (status != ARES_SUCCESS)
 436         warnx("%s", ares_strerror(status));
 437
 438     switch (status) {
 439         case ARES_ENODATA:
 440         case ARES_EFORMERR:
 441         case ARES_ENOTFOUND:
 442             return GPG_ERR_UNKNOWN_HOST;
 443         case ARES_ESERVFAIL:
 444              return GPG_ERR_EHOSTDOWN;
 445         case ARES_ETIMEOUT:
 446             return GPG_ERR_TIMEOUT;
 447         case ARES_ENOMEM:
 448             return gpg_error_from_errno(ENOMEM);
 449         case ARES_ECONNREFUSED:
 450             return GPG_ERR_ECONNREFUSED;
 451         default:
 452             /* FIXME ??? */
 453             return GPG_ERR_EHOSTUNREACH;
 454     }
 455
 456     return ARES_SUCCESS;
 457 }
 458
 459 static void dns_resolve_cb(void *arg, int status, int timeouts,
 460         unsigned char *abuf, int alen)
 461 {
 462     pwm_t *pwm = arg;
 463     int rc;
 464     struct hostent *he;
 465
 466     if (status == ARES_EDESTRUCTION)
 467         return;
 468
 469     if (status != ARES_SUCCESS) {
 470         pwm->tcp_conn->rc = ares_error_to_pwmd(status);
 471         return;
 472     }
 473
 474     //FIXME localhost. works with ipv4. maybe local system config error
 475     /* Check for an IPv6 address first. */
 476     rc = ares_parse_a_reply(abuf, alen, &he, NULL, NULL);
 477
 478     if (rc != ARES_SUCCESS) {
 479         if (rc != ARES_ENODATA) {
 480             pwm->tcp_conn->rc = ares_error_to_pwmd(status);
 481             return;
 482         }
 483
 484         rc = ares_parse_aaaa_reply(abuf, alen, &he, NULL, NULL);
 485
 486         if (rc != ARES_SUCCESS) {
 487             pwm->tcp_conn->rc = ares_error_to_pwmd(status);
 488             return;
 489         }
 490     }
 491
 492     pwm->tcp_conn->he = he;
 493     pwm->tcp_conn->rc = do_connect(pwm, he->h_addrtype, he->h_addr);
 494 }
 495
 496 static gpg_error_t _do_pwmd_tcp_connect_async(pwm_t *pwm, const char *host,
 497         int port, const char *identity, const char *user,
 498         const char *known_hosts, pwmd_async_cmd_t which)
 499 {
 500     pwmd_tcp_conn_t *conn;
 501     gpg_error_t rc;
 502
 503     rc = init_tcp_conn(&conn, host, port, identity, user, known_hosts,
 504             which == ASYNC_CMD_HOSTKEY ? 1 : 0);
 505
 506     if (rc)
 507         return rc;
 508
 509     conn->async = 1;
 510     pwm->tcp_conn = conn;
 511     pwm->tcp_conn->cmd = which;
 512
 513     if (pwm->tcp_conn->cmd == ASYNC_CMD_HOSTKEY)
 514         pwm->tcp_conn->get_only = 1;
 515
 516     pwm->cmd = ASYNC_CMD_DNS;
 517     pwm->state = ASYNC_PROCESS;
 518     ares_init(&pwm->tcp_conn->chan);
 519     ares_query(pwm->tcp_conn->chan, pwm->tcp_conn->host, ns_c_any, ns_t_any,
 520             dns_resolve_cb, pwm);
 521     return 0;
 522 }
 523
 524 gpg_error_t pwmd_tcp_connect_async(pwm_t *pwm, const char *host, int port,
 525         const char *identity, const char *user, const char *known_hosts)
 526 {
 527     return _do_pwmd_tcp_connect_async(pwm, host, port, identity, user,
 528             known_hosts, ASYNC_CMD_CONNECT);
 529 }
 530
 531 static void *_ssh_malloc(size_t size, void **data)
 532 {
 533     return pwmd_malloc(size);
 534 }
 535
 536 static void _ssh_free(void *ptr, void **data)
 537 {
 538     pwmd_free(ptr);
 539 }
 540
 541 static void *_ssh_realloc(void *ptr, size_t size, void **data)
 542 {
 543     return pwmd_realloc(ptr, size);
 544 }
 545
 546 static char *to_hex(const char *str, size_t slen)
 547 {
 548     int i;
 549     char *buf = pwmd_malloc(slen*2+1);
 550
 551     if (!buf)
 552         return NULL;
 553
 554     for (i = 0, buf[0] = 0; i < slen; i++) {
 555         char tmp[3];
 556
 557         sprintf(tmp, "%02x", (unsigned char)str[i]);
 558         strcat(buf, tmp);
 559     }
 560
 561     return buf;
 562 }
 563
 564 static int verify_host_key(pwm_t *pwm)
 565 {
 566     FILE *fp = fopen(pwm->tcp_conn->known_hosts, "r");
 567     char *buf, *p;
 568
 569     if (!fp)
 570         return 1;
 571
 572     buf = pwmd_malloc(LINE_MAX);
 573
 574     if (!buf)
 575         goto fail;
 576
 577     while ((p = fgets(buf, LINE_MAX, fp))) {
 578         if (*p == '#' || isspace(*p))
 579             continue;
 580
 581         if (p[strlen(p)-1] == '\n')
 582             p[strlen(p)-1] = 0;
 583
 584         if (!strcmp(buf, pwm->tcp_conn->hostkey))
 585             goto done;
 586     }
 587
 588 fail:
 589     if (buf)
 590         pwmd_free(buf);
 591
 592     fclose(fp);
 593     return 1;
 594
 595 done:
 596     pwmd_free(buf);
 597     fclose(fp);
 598     return 0;
 599 }
 600
 601 static gpg_error_t authenticate_ssh(pwm_t *pwm)
 602 {
 603     const char *fp = libssh2_hostkey_hash(pwm->tcp_conn->session,
 604             LIBSSH2_HOSTKEY_HASH_SHA1);
 605     char *userauth;
 606
 607     pwm->tcp_conn->hostkey = to_hex(fp, 20);
 608
 609     if (!pwm->tcp_conn->hostkey)
 610         return gpg_error_from_errno(ENOMEM);
 611
 612     if (pwm->tcp_conn->get_only)
 613         return 0;
 614
 615     if (!fp || verify_host_key(pwm))
 616         return GPG_ERR_CHECKSUM;
 617
 618     userauth = libssh2_userauth_list(pwm->tcp_conn->session,
 619             pwm->tcp_conn->username, strlen(pwm->tcp_conn->username));
 620
 621     if (!userauth || !strstr(userauth, "publickey"))
 622         return GPG_ERR_BAD_PIN_METHOD;
 623
 624     if (libssh2_userauth_publickey_fromfile(pwm->tcp_conn->session,
 625                 pwm->tcp_conn->username, pwm->tcp_conn->identity_pub,
 626                 pwm->tcp_conn->identity, NULL))
 627         return GPG_ERR_BAD_SECKEY;
 628
 629     return 0;
 630 }
 631
 632 static gpg_error_t setup_tcp_session(pwm_t *pwm)
 633 {
 634     assuan_context_t ctx;
 635     struct assuan_io_hooks io_hooks = {read_hook, write_hook};
 636     gpg_error_t rc;
 637
 638     pwm->tcp_conn->session = libssh2_session_init_ex(_ssh_malloc, _ssh_free,
 639             _ssh_realloc, NULL);
 640
 641     if (!pwm->tcp_conn->session) {
 642         rc = gpg_error_from_errno(ENOMEM);
 643         goto fail;
 644     }
 645
 646     if (libssh2_session_startup(pwm->tcp_conn->session, pwm->tcp_conn->fd)) {
 647         rc = GPG_ERR_ASSUAN_SERVER_FAULT;
 648         goto fail;
 649     }
 650
 651     rc = authenticate_ssh(pwm);
 652
 653     if (rc)
 654         goto fail;
 655
 656     /* pwmd_get_hostkey(). */
 657     if (pwm->tcp_conn->get_only) {
 658         pwm->result = pwmd_strdup(pwm->tcp_conn->hostkey);
 659
 660         if (!pwm->result) {
 661             rc = gpg_error_from_errno(ENOMEM);
 662             goto fail;
 663         }
 664
 665         return 0;
 666     }
 667
 668     pwm->tcp_conn->channel = libssh2_channel_open_session(pwm->tcp_conn->session);
 669
 670     if (!pwm->tcp_conn->channel) {
 671         rc = GPG_ERR_ASSUAN_SERVER_FAULT;
 672         goto fail;
 673     }
 674
 675     if (libssh2_channel_shell(pwm->tcp_conn->channel)) {
 676         rc = GPG_ERR_ASSUAN_SERVER_FAULT;
 677         goto fail;
 678     }
 679
 680     assuan_set_io_hooks(&io_hooks);
 681     rc = assuan_socket_connect_fd(&ctx, pwm->tcp_conn->fd, 0, pwm);
 682
 683     if (rc)
 684         goto fail;
 685
 686     assuan_set_finish_handler(ctx, _ssh_assuan_deinit);
 687     pwm->ctx = ctx;
 688     return _socket_connect_finalize(pwm);
 689
 690 fail:
 691     free_tcp_conn(pwm->tcp_conn);
 692     pwm->tcp_conn = NULL;
 693     return rc;
 694 }
 695
 696 static gpg_error_t _do_pwmd_tcp_connect(pwm_t *pwm, const char *host, int port,
 697         const char *identity, const char *user, const char *known_hosts, int get)
 698 {
 699     pwmd_tcp_conn_t *conn;
 700     gpg_error_t rc;
 701
 702     rc = init_tcp_conn(&conn, host, port, identity, user, known_hosts, get);
 703
 704     if (rc)
 705         return rc;
 706
 707     pwm->tcp_conn = conn;
 708     pwm->tcp_conn->get_only = get;
 709     pwm->cmd = ASYNC_CMD_DNS;
 710     ares_init(&pwm->tcp_conn->chan);
 711     ares_query(pwm->tcp_conn->chan, pwm->tcp_conn->host, ns_c_any, ns_t_any,
 712             dns_resolve_cb, pwm);
 713
 714     /* dns_resolve_cb() may have already been called. */
 715     if (pwm->tcp_conn->rc) {
 716         rc = pwm->tcp_conn->rc;
 717         goto fail;
 718     }
 719
 720     /*
 721      * Fake a blocking DNS lookup. libcares does a better job than
 722      * getaddrinfo().
 723      */
 724     do {
 725         fd_set rfds, wfds;
 726         int n;
 727         struct timeval tv;
 728
 729         FD_ZERO(&rfds);
 730         FD_ZERO(&wfds);
 731         n = ares_fds(pwm->tcp_conn->chan, &rfds, &wfds);
 732         ares_timeout(pwm->tcp_conn->chan, NULL, &tv);
 733 #ifdef WITH_LIBPTH
 734         n = pth_select(n, &rfds, &wfds, NULL, &tv);
 735 #else
 736         n = select(n, &rfds, &wfds, NULL, &tv);
 737 #endif
 738
 739         if (n == -1) {
 740             rc = gpg_error_from_syserror();
 741             goto fail;
 742         }
 743         else if (n == 0) {
 744             rc = GPG_ERR_TIMEOUT;
 745             goto fail;
 746         }
 747
 748         ares_process(pwm->tcp_conn->chan, &rfds, &wfds);
 749
 750         if (pwm->tcp_conn->rc)
 751             break;
 752     } while (pwm->cmd == ASYNC_CMD_DNS);
 753
 754     if (pwm->tcp_conn->rc) {
 755         rc = pwm->tcp_conn->rc;
 756         goto fail;
 757     }
 758
 759     return setup_tcp_session(pwm);
 760
 761 fail:
 762     return rc;
 763 }
 764
 765 gpg_error_t pwmd_tcp_connect(pwm_t *pwm, const char *host, int port,
 766         const char *identity, const char *user, const char *known_hosts)
 767 {
 768     return _do_pwmd_tcp_connect(pwm, host, port, identity, user, known_hosts, 0);
 769 }
 770
 771 /* Must free the result with pwmd_free(). */
 772 gpg_error_t pwmd_get_hostkey(const char *host, int port, char **result)
 773 {
 774     char *hostkey;
 775     pwm_t *pwm = pwmd_new(NULL);
 776     gpg_error_t rc;
 777
 778     if (!pwm)
 779         return gpg_error_from_errno(ENOMEM);
 780
 781     rc = _do_pwmd_tcp_connect(pwm, host, port, NULL, NULL, NULL, 1);
 782
 783     if (rc) {
 784         pwmd_close(pwm);
 785         return rc;
 786     }
 787
 788     hostkey = pwmd_strdup(pwm->tcp_conn->hostkey);
 789
 790     if (!hostkey)
 791         rc = gpg_error_from_errno(ENOMEM);
 792
 793     pwmd_close(pwm);
 794     *result = hostkey;
 795     return rc;
 796 }
 797
 798 gpg_error_t pwmd_get_hostkey_async(pwm_t *pwm, const char *host, int port)
 799 {
 800     return _do_pwmd_tcp_connect_async(pwm, host, port, NULL, NULL, NULL,
 801             ASYNC_CMD_HOSTKEY);
 802 }
 803 #endif
 804
 805 gpg_error_t pwmd_connect(pwm_t *pwm, const char *path)
 806 {
 807     char *socketpath = NULL;
 808     assuan_context_t ctx;
 809     struct passwd pw;
 810     char *pwbuf = _getpwuid(&pw);
 811     gpg_error_t rc;
 812
 813     if (!pwbuf)
 814         return gpg_error_from_errno(errno);
 815
 816     if (!path) {
 817         socketpath = (char *)pwmd_malloc(strlen(pw.pw_dir) + strlen("/.pwmd/socket") + 1);
 818         sprintf(socketpath, "%s/.pwmd/socket", pw.pw_dir);
 819     }
 820     else
 821         socketpath = pwmd_strdup(path);
 822
 823     pwmd_free(pwbuf);
 824     rc = assuan_socket_connect_ext(&ctx, socketpath, -1, 0);
 825     pwmd_free(socketpath);
 826
 827     if (rc)
 828         return rc;
 829
 830     pwm->ctx = ctx;
 831     return _socket_connect_finalize(pwm);
 832 }
 833
 834 void pwmd_close(pwm_t *pwm)
 835 {
 836     if (!pwm)
 837         return;
 838
 839     if (pwm->ctx)
 840         assuan_disconnect(pwm->ctx);
 841
 842     if (pwm->password)
 843         pwmd_free(pwm->password);
 844
 845     if (pwm->title)
 846         pwmd_free(pwm->title);
 847
 848     if (pwm->desc)
 849         pwmd_free(pwm->desc);
 850
 851     if (pwm->prompt)
 852         pwmd_free(pwm->prompt);
 853
 854     if (pwm->pinentry_tty)
 855         pwmd_free(pwm->pinentry_tty);
 856
 857     if (pwm->pinentry_display)
 858         pwmd_free(pwm->pinentry_display);
 859
 860     if (pwm->pinentry_term)
 861         pwmd_free(pwm->pinentry_term);
 862
 863     if (pwm->lcctype)
 864         pwmd_free(pwm->lcctype);
 865
 866     if (pwm->lcmessages)
 867         pwmd_free(pwm->lcmessages);
 868
 869     if (pwm->filename)
 870         pwmd_free(pwm->filename);
 871
 872     if (pwm->name)
 873         pwmd_free(pwm->name);
 874
 875 #ifdef WITH_TCP
 876     if (pwm->tcp_conn)
 877         free_tcp_conn(pwm->tcp_conn);
 878 #endif
 879
 880     pwmd_free(pwm);
 881 }
 882
 883 static int mem_realloc_cb(void *data, const void *buffer, size_t len)
 884 {
 885     membuf_t *mem = (membuf_t *)data;
 886     void *p;
 887
 888     if (!buffer)
 889         return 0;
 890
 891     if ((p = pwmd_realloc(mem->buf, mem->len + len)) == NULL)
 892         return 1;
 893
 894     mem->buf = p;
 895     memcpy((char *)mem->buf + mem->len, buffer, len);
 896     mem->len += len;
 897     return 0;
 898 }
 899
 900 static int _inquire_cb(void *data, const char *keyword)
 901 {
 902     pwm_t *pwm = (pwm_t *)data;
 903     gpg_error_t rc = 0;
 904     int flags = fcntl(pwm->fd, F_GETFL);
 905
 906     /* Shouldn't get this far without a callback. */
 907     if (!pwm->inquire_func)
 908         return GPG_ERR_INV_ARG;
 909
 910     /*
 911      * Since the socket file descriptor is probably set to non-blocking, set to
 912      * blocking to prevent GPG_ERR_EAGAIN errors. This should be fixes when
 913      * asynchronous INQUIRE is supported by either libassuan or a later
 914      * libpwmd.
 915      */
 916     fcntl(pwm->fd, F_SETFL, 0);
 917
 918     for (;;) {
 919         char *result = NULL;
 920         size_t len;
 921         gpg_error_t arc;
 922
 923         rc = pwm->inquire_func(pwm->inquire_data, keyword, rc, &result, &len);
 924         rc = gpg_err_code(rc);
 925
 926         if (rc == GPG_ERR_EOF || !rc) {
 927             if (len <= 0 || !result || !*result) {
 928                 rc = 0;
 929                 break;
 930             }
 931
 932             arc = assuan_send_data(pwm->ctx, result, len);
 933
 934             if (rc == GPG_ERR_EOF) {
 935                 rc = arc;
 936                 break;
 937             }
 938
 939             rc = arc;
 940         }
 941         else if (rc)
 942             break;
 943     }
 944
 945     fcntl(pwm->fd, F_SETFL, flags);
 946     return rc;
 947 }
 948
 949 static gpg_error_t do_nb_command(pwm_t *pwm, const char *cmd, const char *arg)
 950 {
 951     char *buf;
 952     gpg_error_t rc;
 953     size_t len = strlen(cmd) + 2;
 954
 955     len += arg ? strlen(arg) : 0;
 956
 957     if (pwm->state == ASYNC_DONE)
 958         pwm->state = ASYNC_INIT;
 959
 960     if (pwm->state != ASYNC_INIT)
 961         return GPG_ERR_INV_STATE;
 962
 963     buf = (char *)pwmd_malloc(len);
 964
 965     if (!buf) {
 966         rc = gpg_error_from_errno(ENOMEM);
 967         goto fail;
 968     }
 969
 970     snprintf(buf, len, "%s %s", cmd, arg ? arg : "");
 971     rc = assuan_write_line(pwm->ctx, buf);
 972     pwmd_free(buf);
 973
 974     if (!rc)
 975         pwm->state = ASYNC_PROCESS;
 976
 977 fail:
 978     return rc;
 979 }
 980
 981 gpg_error_t pwmd_open_async(pwm_t *pwm, const char *filename)
 982 {
 983     if (!pwm || !filename)
 984         return GPG_ERR_INV_ARG;
 985
 986     /* For pinentry retries. */
 987     if (!pwm->is_open_cmd) {
 988         if (pwm->filename)
 989             pwmd_free(pwm->filename);
 990
 991         pwm->filename = pwmd_strdup(filename);
 992     }
 993
 994     pwm->is_open_cmd = 1;
 995     pwm->cmd = ASYNC_CMD_OPEN;
 996     return do_nb_command(pwm, "OPEN", filename);
 997 }
 998
 999 gpg_error_t pwmd_save_async(pwm_t *pwm)
1000 {
1001     if (!pwm)
1002         return GPG_ERR_INV_ARG;
1003
1004     pwm->cmd = ASYNC_CMD_SAVE;
1005     return do_nb_command(pwm, "SAVE", NULL);
1006 }
1007
1008 static gpg_error_t parse_assuan_line(pwm_t *pwm)
1009 {
1010     gpg_error_t rc;
1011     char *line;
1012     size_t len;
1013
1014     rc = assuan_read_line(pwm->ctx, &line, &len);
1015
1016     if (!rc) {
1017         if (line[0] == 'O' && line[1] == 'K' &&
1018                 (line[2] == 0 || line[2] == ' ')) {
1019             pwm->state = ASYNC_DONE;
1020         }
1021         else if (line[0] == '#') {
1022         }
1023         else if (line[0] == 'S' && (line[1] == 0 || line[1] == ' ')) {
1024             if (pwm->status_func) {
1025                 pwm->status_func(pwm->status_data,
1026                         line[1] == 0 ? line+1 : line+2);
1027             }
1028         }
1029         else if (line[0] == 'E' && line[1] == 'R' && line[2] == 'R' &&
1030                 (line[3] == 0 || line[3] == ' ')) {
1031             line += 4;
1032             rc = atoi(line);
1033             pwm->state = ASYNC_DONE;
1034         }
1035     }
1036
1037     return rc;
1038 }
1039
1040 gpg_error_t pwmd_pending_line(pwm_t *pwm)
1041 {
1042     if (!pwm)
1043         return GPG_ERR_INV_ARG;
1044
1045     if (!pwm->ctx)
1046         return GPG_ERR_INV_STATE;
1047
1048     return assuan_pending_line(pwm->ctx) ? 0 : GPG_ERR_NO_DATA;
1049 }
1050
1051 static pwmd_async_t reset_async(pwm_t *pwm)
1052 {
1053     pwm->state = ASYNC_INIT;
1054     pwm->cmd = ASYNC_CMD_NONE;
1055     pwm->ntries = 0;
1056 #ifdef WITH_PINENTRY
1057     pwm->is_open_cmd = 0;
1058
1059     if (pwm->nb_fd != -1) {
1060         close(pwm->nb_fd);
1061         pwm->nb_fd = -1;
1062     }
1063 #endif
1064 #ifdef WITH_TCP
1065     if (pwm->tcp_conn && pwm->tcp_conn->fd != -1) {
1066         close(pwm->tcp_conn->fd);
1067         pwm->tcp_conn->fd = -1;
1068     }
1069 #endif
1070
1071     return ASYNC_DONE;
1072 };
1073
1074 pwmd_async_t pwmd_process(pwm_t *pwm, gpg_error_t *rc, char **result)
1075 {
1076     fd_set fds;
1077     int n;
1078     struct timeval tv = {0, 0};
1079
1080     *rc = 0;
1081
1082     if (!pwm) {
1083         *rc = GPG_ERR_INV_ARG;
1084         return ASYNC_DONE;
1085     }
1086
1087     /* When not in a command, this will let libassuan process status messages
1088      * by calling PWMD_OPTION_STATUS_FUNC. The client can poll the file
1089      * descriptor returned by pwmd_get_fd() to determine when this should be
1090      * called or call pwmd_pending_line() to determine whether a buffered line
1091      * needs to be processed. */
1092     if (pwm->cmd == ASYNC_CMD_NONE) {
1093         *rc = assuan_command(pwm, pwm->ctx, NULL, "NOP");
1094         return pwm->state;
1095     }
1096
1097     /* Fixes pwmd_open/save_async2() when there is a cached or new file. */
1098     if (pwm->state == ASYNC_DONE) {
1099         reset_async(pwm);
1100         return ASYNC_DONE;
1101     }
1102
1103     if (pwm->state != ASYNC_PROCESS) {
1104         *rc = GPG_ERR_INV_STATE;
1105         return ASYNC_DONE;
1106     }
1107
1108 #ifdef WITH_TCP
1109     if (pwm->cmd == ASYNC_CMD_DNS) {
1110         fd_set rfds, wfds;
1111
1112         if (pwm->tcp_conn->rc) {
1113             *rc = pwm->tcp_conn->rc;
1114             reset_async(pwm);
1115             return ASYNC_DONE;
1116         }
1117
1118         FD_ZERO(&rfds);
1119         FD_ZERO(&wfds);
1120         n = ares_fds(pwm->tcp_conn->chan, &rfds, &wfds);
1121
1122         /* Shouldn't happen. */
1123         if (!n)
1124             return pwm->state;
1125
1126 #ifdef WITH_LIBPTH
1127         n = pth_select(n, &rfds, &wfds, NULL, &tv);
1128 #else
1129         n = select(n, &rfds, &wfds, NULL, &tv);
1130 #endif
1131
1132         if (n > 0)
1133             ares_process(pwm->tcp_conn->chan, &rfds, &wfds);
1134
1135         return pwm->state;
1136     }
1137     else if (pwm->cmd == ASYNC_CMD_CONNECT) {
1138         if (pwm->tcp_conn->rc == GPG_ERR_EINPROGRESS) {
1139             int ret;
1140             socklen_t len = sizeof(int);
1141
1142             FD_ZERO(&fds);
1143             FD_SET(pwm->tcp_conn->fd, &fds);
1144 #ifdef WITH_LIBPTH
1145             n = pth_select(pwm->tcp_conn->fd+1, NULL, &fds, NULL, &tv);
1146 #else
1147             n = select(pwm->tcp_conn->fd+1, NULL, &fds, NULL, &tv);
1148 #endif
1149
1150             if (!n || !FD_ISSET(pwm->tcp_conn->fd, &fds))
1151                 return pwm->state;
1152             else if (n == -1) {
1153                 *rc = gpg_error_from_syserror();
1154                 reset_async(pwm);
1155                 return ASYNC_DONE;
1156             }
1157
1158             ret = getsockopt(pwm->tcp_conn->fd, SOL_SOCKET, SO_ERROR, &n, &len);
1159
1160             if (ret || n) {
1161                 *rc = ret ? gpg_error_from_syserror() : gpg_error_from_errno(n);
1162                 reset_async(pwm);
1163                 return ASYNC_DONE;
1164             }
1165         }
1166         else if (pwm->tcp_conn->rc) {
1167             *rc = pwm->tcp_conn->rc;
1168             reset_async(pwm);
1169             return ASYNC_DONE;
1170         }
1171
1172         fcntl(pwm->tcp_conn->fd, F_SETFL, 0);
1173         *rc = setup_tcp_session(pwm);
1174
1175         switch (pwm->tcp_conn->cmd) {
1176             case ASYNC_CMD_HOSTKEY:
1177                 if (!*rc)
1178                     *result = pwm->result;
1179                 break;
1180             default:
1181                 break;
1182         }
1183
1184         return reset_async(pwm);
1185     }
1186 #endif
1187
1188 #ifdef WITH_PINENTRY
1189     if (pwm->cmd == ASYNC_CMD_OPEN2 || pwm->cmd == ASYNC_CMD_SAVE2) {
1190         if (pwm->nb_fd == -1) {
1191             *rc = GPG_ERR_INV_STATE;
1192             return reset_async(pwm);
1193         }
1194
1195         FD_ZERO(&fds);
1196         FD_SET(pwm->nb_fd, &fds);
1197 #ifdef WITH_LIBPTH
1198         n = pth_select(pwm->nb_fd+1, &fds, NULL, NULL, &tv);
1199 #else
1200         n = select(pwm->nb_fd+1, &fds, NULL, NULL, &tv);
1201 #endif
1202         if (n == -1) {
1203             *rc = gpg_error_from_syserror();
1204             return reset_async(pwm);
1205         }
1206
1207         if (n > 0) {
1208             pwmd_nb_status_t nb;
1209             size_t len = read(pwm->nb_fd, &nb, sizeof(nb));
1210
1211             *rc = nb.error;
1212             return reset_async(pwm);
1213         }
1214
1215         return pwm->state;
1216     }
1217 #endif
1218
1219     if (pwm->fd < 0) {
1220         *rc = GPG_ERR_INV_STATE;
1221         return reset_async(pwm);
1222     }
1223
1224     /* This is for the non-blocking OPEN and SAVE commands. */
1225     FD_ZERO(&fds);
1226     FD_SET(pwm->fd, &fds);
1227 #ifdef WITH_LIBPTH
1228     n = pth_select(pwm->fd+1, &fds, NULL, NULL, &tv);
1229 #else
1230     n = select(pwm->fd+1, &fds, NULL, NULL, &tv);
1231 #endif
1232
1233     if (n == -1) {
1234         *rc = gpg_error_from_syserror();
1235         return reset_async(pwm);
1236     }
1237
1238     if (n > 0) {
1239         if (FD_ISSET(pwm->fd, &fds)) {
1240             *rc = parse_assuan_line(pwm);
1241
1242             if (*rc)
1243                 return reset_async(pwm);
1244         }
1245     }
1246
1247     while (!*rc && assuan_pending_line(pwm->ctx))
1248         *rc = parse_assuan_line(pwm);
1249
1250     if (*rc)
1251         return reset_async(pwm);
1252
1253     /* For pinentry retries. */
1254     if (pwm->is_open_cmd && gpg_err_code(*rc) == EPWMD_BADKEY &&
1255             ++pwm->ntries < pwm->pinentry_tries) {
1256         pwm->state = ASYNC_INIT;
1257         *rc = pwmd_open_async(pwm, pwm->filename);
1258     }
1259
1260     if (*rc)
1261         return reset_async(pwm);
1262
1263     if (pwm->state == ASYNC_DONE) {
1264         reset_async(pwm);
1265         return ASYNC_DONE;
1266     }
1267
1268     return pwm->state;
1269 }
1270
1271 static gpg_error_t assuan_command(pwm_t *pwm, assuan_context_t ctx,
1272         char **result, const char *cmd)
1273 {
1274     membuf_t data;
1275     gpg_error_t rc;
1276
1277     data.len = 0;
1278     data.buf = NULL;
1279
1280     rc = assuan_transact(ctx, cmd, mem_realloc_cb, &data, _inquire_cb, pwm,
1281             pwm->status_func, pwm->status_data);
1282
1283     if (rc) {
1284         if (data.buf) {
1285             pwmd_free(data.buf);
1286             data.buf = NULL;
1287         }
1288     }
1289     else {
1290         if (data.buf) {
1291             mem_realloc_cb(&data, "", 1);
1292
1293             if (!result) {
1294                 pwmd_free(data.buf);
1295                 rc = GPG_ERR_INV_ARG;
1296             }
1297             else
1298                 *result = (char *)data.buf;
1299         }
1300     }
1301
1302     return gpg_err_code(rc);
1303 }
1304
1305 gpg_error_t pwmd_inquire(pwm_t *pwm, const char *cmd, pwmd_inquire_fn fn,
1306         void *data)
1307 {
1308     if (!pwm || !cmd || !fn)
1309         return GPG_ERR_INV_ARG;
1310
1311     pwm->inquire_func = fn;
1312     pwm->inquire_data = data;
1313     return assuan_command(pwm, pwm->ctx, NULL, cmd);
1314 }
1315
1316 static gpg_error_t terminate_pinentry(pwm_t *pwm)
1317 {
1318 #ifndef WITH_PINENTRY
1319     return GPG_ERR_NOT_IMPLEMENTED;
1320 #else
1321     pid_t pid = pwm->pid;
1322
1323     pwm->pid = -1;
1324
1325     if (!pwm || pid == -1)
1326         return GPG_ERR_INV_ARG;
1327
1328     if (kill(pid, 0) == 0) {
1329         if (kill(pid, SIGTERM) == -1) {
1330             if (kill(pid, SIGKILL) == -1)
1331                 return gpg_error_from_errno(errno);
1332         }
1333     }
1334     else
1335         return gpg_error_from_errno(errno);
1336
1337     return 0;
1338 #endif
1339 }
1340
1341 #ifdef WITH_PINENTRY
1342 static gpg_error_t set_pinentry_strings(pwm_t *pwm, int which)
1343 {
1344     char *buf;
1345     char tmp[ASSUAN_LINELENGTH];
1346     gpg_error_t error;
1347
1348     if (!pwm->title)
1349         pwm->title = pwmd_strdup(N_("LibPWMD"));
1350
1351     if (!pwm->prompt)
1352         pwm->prompt = pwmd_strdup(N_("Passphrase:"));
1353
1354     if (!pwm->desc && !which)
1355         pwm->desc = pwmd_strdup(N_("Enter a passphrase."));
1356
1357     if (which == 1) {
1358         snprintf(tmp, sizeof(tmp), "SETERROR %s", N_("Invalid passphrase, please try again."));
1359         buf = pwmd_strdup(tmp);
1360     }
1361     else if (which == 2) {
1362         snprintf(tmp, sizeof(tmp), "SETERROR %s", N_("Please type the passphrase again for confirmation."));
1363         buf = pwmd_strdup(tmp);
1364     }
1365     else {
1366         buf = (char *)pwmd_malloc(strlen("SETERROR ") + strlen(pwm->desc) + 1);
1367         sprintf(buf, "SETERROR %s", pwm->desc);
1368     }
1369
1370     error = pinentry_command(pwm, NULL, buf);
1371     pwmd_free(buf);
1372
1373     if (error)
1374         return error;
1375
1376     buf = (char *)pwmd_malloc(strlen("SETPROMPT ") + strlen(pwm->prompt) + 1);
1377     sprintf(buf, "SETPROMPT %s", pwm->prompt);
1378     error = pinentry_command(pwm, NULL, buf);
1379     pwmd_free(buf);
1380
1381     if (error)
1382         return error;
1383
1384     buf = (char *)pwmd_malloc(strlen("SETDESC ") + strlen(pwm->title) + 1);
1385     sprintf(buf, "SETDESC %s", pwm->title);
1386     error = pinentry_command(pwm, NULL, buf);
1387     pwmd_free(buf);
1388     return error;
1389 }
1390
1391 static void update_pinentry_settings(pwm_t *pwm)
1392 {
1393     FILE *fp;
1394     char buf[LINE_MAX];
1395     char *p;
1396     struct passwd pw;
1397     char *pwbuf = _getpwuid(&pw);
1398
1399     if (!pwbuf)
1400         return;
1401
1402     snprintf(buf, sizeof(buf), "%s/.pwmd/pinentry.conf", pw.pw_dir);
1403     pwmd_free(pwbuf);
1404
1405     if ((fp = fopen(buf, "r")) == NULL)
1406         return;
1407
1408     while ((p = fgets(buf, sizeof(buf), fp)) != NULL) {
1409         char name[32], val[256];
1410
1411         if (sscanf(p, " %31[a-zA-Z] = %255s", name, val) != 2)
1412             continue;
1413
1414         if (strcasecmp(name, "TTYNAME") == 0) {
1415             pwmd_free(pwm->pinentry_tty);
1416             pwm->pinentry_tty = pwmd_strdup(val);
1417         }
1418         else if (strcasecmp(name, "TTYTYPE") == 0) {
1419             pwmd_free(pwm->pinentry_term);
1420             pwm->pinentry_term = pwmd_strdup(val);
1421         }
1422         else if (strcasecmp(name, "DISPLAY") == 0) {
1423             pwmd_free(pwm->pinentry_display);
1424             pwm->pinentry_display = pwmd_strdup(val);
1425         }
1426         else if (strcasecmp(name, "PATH") == 0) {
1427             pwmd_free(pwm->pinentry_path);
1428             pwm->pinentry_path = pwmd_strdup(val);
1429         }
1430     }
1431
1432     fclose(fp);
1433 }
1434
1435 static gpg_error_t launch_pinentry(pwm_t *pwm)
1436 {
1437     int rc;
1438     assuan_context_t ctx;
1439     int child_list[] = {-1};
1440     char *display = getenv("DISPLAY");
1441     const char *argv[10];
1442     const char **p = argv;
1443     int have_display = 0;
1444     char *tty = NULL;
1445     char *ttybuf = NULL;
1446
1447     update_pinentry_settings(pwm);
1448
1449     if (pwm->pinentry_display || display)
1450         have_display = 1;
1451     else {
1452         if (!pwm->pinentry_tty) {
1453             ttybuf = pwmd_malloc(255);
1454
1455             if (!ttybuf)
1456                 return gpg_error_from_errno(ENOMEM);
1457
1458             rc = ttyname_r(STDOUT_FILENO, ttybuf, 255);
1459
1460             if (rc) {
1461                 pwmd_free(ttybuf);
1462                 return gpg_error_from_errno(rc);
1463             }
1464
1465             tty = ttybuf;
1466         }
1467         else
1468             tty = pwm->pinentry_tty;
1469     }
1470
1471     if (!have_display && !tty)
1472         return GPG_ERR_ENOTTY;
1473
1474     *p++ = "pinentry";
1475     *p++ = have_display ? "--display" : "--ttyname";
1476     *p++ = have_display ? pwm->pinentry_display ? pwm->pinentry_display : display : tty;
1477
1478     if (pwm->lcctype) {
1479         *p++ = "--lc-ctype";
1480         *p++ = pwm->lcctype;
1481     }
1482
1483     if (pwm->lcmessages) {
1484         *p++ = "--lc-messages";
1485         *p++ = pwm->lcmessages;
1486     }
1487
1488     *p = NULL;
1489
1490     if (!have_display) {
1491         *p++ = "--ttytype";
1492         *p++ = pwm->pinentry_term ? pwm->pinentry_term : getenv("TERM");
1493         *p = NULL;
1494     }
1495
1496     rc = assuan_pipe_connect(&ctx, pwm->pinentry_path ? pwm->pinentry_path : PINENTRY_PATH, argv, child_list);
1497
1498     if (ttybuf)
1499         pwmd_free(ttybuf);
1500
1501     if (rc)
1502         return rc;
1503
1504     pwm->pid = assuan_get_pid(ctx);
1505     pwm->pctx = ctx;
1506     return set_pinentry_strings(pwm, 0);
1507 }
1508
1509 static gpg_error_t pinentry_command(pwm_t *pwm, char **result, const char *cmd)
1510 {
1511     gpg_error_t n;
1512
1513     if (!pwm->pctx) {
1514         n = launch_pinentry(pwm);
1515
1516         if (n)
1517             return n;
1518     }
1519
1520     return assuan_command(pwm, pwm->pctx, result, cmd);
1521 }
1522
1523 static void pinentry_disconnect(pwm_t *pwm)
1524 {
1525     if (pwm->pctx)
1526         assuan_disconnect(pwm->pctx);
1527
1528     pwm->pctx = NULL;
1529     pwm->pid = -1;
1530 }
1531
1532 /*
1533  * Only called from a child process.
1534  */
1535 static void catchsig(int sig)
1536 {
1537     switch (sig) {
1538         case SIGALRM:
1539             if (gelapsed++ >= gtimeout)
1540                 terminate_pinentry(gpwm);
1541             else
1542                 alarm(1);
1543             break;
1544         default:
1545             break;
1546     }
1547 }
1548 #endif
1549
1550 /*
1551  * Borrowed from libassuan.
1552  */
1553 static char *percent_escape(const char *atext)
1554 {
1555     const unsigned char *s;
1556     int len = strlen(atext) * 3 + 1;
1557     char *buf = (char *)pwmd_malloc(len), *p = buf;
1558
1559     if (!buf)
1560         return NULL;
1561
1562     for (s=(const unsigned char *)atext; *s; s++) {
1563         if (*s < ' ') {
1564             sprintf (p, "%%%02X", *s);
1565             p += 3;
1566         }
1567         else
1568             *p++ = *s;
1569     }
1570
1571     *p = 0;
1572     return buf;
1573 }
1574
1575 static gpg_error_t send_command(pwm_t *pwm, char **result, const char *cmd)
1576 {
1577     if (!cmd)
1578         return GPG_ERR_INV_ARG;
1579
1580     return assuan_command(pwm, pwm->ctx, result, cmd);
1581 }
1582
1583 gpg_error_t pwmd_command_ap(pwm_t *pwm, char **result, const char *cmd,
1584         va_list ap)
1585 {
1586     char *buf;
1587     size_t len;
1588     gpg_error_t error;
1589
1590     if (!pwm || !cmd)
1591         return GPG_ERR_INV_ARG;
1592
1593     /*
1594      * C99 allows the dst pointer to be null which will calculate the length
1595      * of the would-be result and return it.
1596      */
1597     len = vsnprintf(NULL, 0, cmd, ap)+1;
1598     buf = (char *)pwmd_malloc(len);
1599     len = vsnprintf(buf, len, cmd, ap);
1600     error = send_command(pwm, result, buf);
1601     pwmd_free(buf);
1602     return error;
1603 }
1604
1605 /*
1606  * Avoid sending the BYE command here. libassuan will close the file
1607  * descriptor and release the assuan context. Use pwmd_close() instead.
1608  */
1609 gpg_error_t pwmd_command(pwm_t *pwm, char **result, const char *cmd, ...)
1610 {
1611     va_list ap;
1612     gpg_error_t error;
1613
1614     if (!pwm || !cmd)
1615         return GPG_ERR_INV_ARG;
1616
1617     if (result)
1618         *result = NULL;
1619
1620     va_start(ap, cmd);
1621     error = pwmd_command_ap(pwm, result, cmd, ap);
1622     va_end(ap);
1623     return error;
1624 }
1625
1626 #ifdef WITH_PINENTRY
1627 static gpg_error_t do_getpin(pwm_t *pwm, char **result)
1628 {
1629     if (gtimeout) {
1630         signal(SIGALRM, catchsig);
1631         alarm(1);
1632     }
1633
1634     *result = NULL;
1635     return pinentry_command(pwm, result, "GETPIN");
1636 }
1637
1638 static gpg_error_t getpin(pwm_t *pwm, char **result, int *try_n, int which)
1639 {
1640     int pin_try = *try_n;
1641     gpg_error_t error;
1642
1643 getpin_again:
1644     *try_n = pin_try;
1645
1646     if (pin_try == -1) {
1647         error = set_pinentry_strings(pwm, which);
1648
1649         if (error) {
1650             pinentry_disconnect(pwm);
1651             return error;
1652         }
1653     }
1654     else {
1655         if (pwm->pinentry_tries-1 != pin_try) {
1656             error = set_pinentry_strings(pwm, 1);
1657
1658             if (error) {
1659                 pinentry_disconnect(pwm);
1660                 return error;
1661             }
1662         }
1663     }
1664
1665     error = do_getpin(pwm, result);
1666
1667     /*
1668      * Since there was input cancel any timeout setting.
1669      */
1670     alarm(0);
1671
1672     if (error) {
1673         if (error == GPG_ERR_CANCELED)
1674             return GPG_ERR_CANCELED;
1675
1676         if (pin_try != -1 && pin_try--)
1677             goto getpin_again;
1678
1679         if (pwm->pctx)
1680             pinentry_disconnect(pwm);
1681
1682         *try_n = pin_try;
1683         return error;
1684     }
1685
1686     return 0;
1687 }
1688 #endif
1689
1690 static gpg_error_t do_open_command(pwm_t *pwm, const char *filename, char *password)
1691 {
1692     char buf[ASSUAN_LINELENGTH];
1693     gpg_error_t error;
1694     char *result = NULL;
1695
1696     snprintf(buf, sizeof(buf), "OPEN %s %s", filename, password ? password : "");
1697     error = send_command(pwm, &result, buf);
1698     memset(buf, 0, sizeof(buf));
1699
1700     if (error && result)
1701         pwmd_free(result);
1702
1703     return error;
1704 }
1705
1706 static gpg_error_t do_pwmd_open(pwm_t *pwm, const char *filename, int nb)
1707 {
1708     char *result = NULL;
1709     char *password = NULL;
1710     char path[PATH_MAX];
1711 #ifdef WITH_PINENTRY
1712     int pin_try;
1713 #endif
1714     gpg_error_t rc;
1715
1716     if (!pwm || !filename || !*filename)
1717         return GPG_ERR_INV_ARG;
1718
1719 #ifdef WITH_PINENTRY
1720     pin_try = pwm->pinentry_tries - 1;
1721 #endif
1722
1723     /*
1724      * Avoid calling pinentry if the password is cached on the server or if
1725      * this is a new file.
1726      */
1727     rc = pwmd_command(pwm, &result, "GETCONFIG data_directory");
1728
1729     if (rc)
1730         return rc;
1731
1732     snprintf(path, sizeof(path), "%s/%s", result, filename);
1733     pwmd_free(result);
1734
1735     if (access(path, R_OK) == -1) {
1736         if (errno == ENOENT)
1737             goto gotpassword;
1738     }
1739
1740     rc = pwmd_command(pwm, &result, "ISCACHED %s", filename);
1741
1742     if (rc == EPWMD_CACHE_NOT_FOUND) {
1743         if (pwm->passfunc) {
1744             password = (char *)pwm->passfunc(pwm->passdata);
1745             goto gotpassword;
1746         }
1747
1748 #ifdef WITH_PINENTRY
1749         /*
1750          * Get the password from pinentry.
1751          */
1752         if (pwm->use_pinentry) {
1753             /*
1754              * Nonblocking is wanted. fork() then return a file descriptor
1755              * that the client can use to read() from.
1756              */
1757             if (nb) {
1758                 int p[2];
1759                 pid_t pid;
1760                 pwmd_nb_status_t pw;
1761
1762                 if (pipe(p) == -1)
1763                     return gpg_error_from_syserror();
1764
1765 #ifdef WITH_LIBPTH
1766                 pid = pth_fork();
1767 #else
1768                 pid = fork();
1769 #endif
1770
1771                 switch (pid) {
1772                     case 0:
1773                         close(p[0]);
1774                         pw.fd = p[0];
1775
1776                         if (pwm->pinentry_timeout > 0) {
1777                             gpwm = pwm;
1778                             gtimeout = pwm->pinentry_timeout;
1779                             gelapsed = 0;
1780                         }
1781
1782 getpin_nb_again:
1783                         rc = getpin(pwm, &password, &pin_try, 0);
1784
1785                         if (rc) {
1786 getpin_nb_fail:
1787                             if (pwm->pctx)
1788                                 pinentry_disconnect(pwm);
1789
1790                             if (gtimeout && gelapsed >= gtimeout)
1791                                 rc = GPG_ERR_TIMEOUT;
1792
1793                             pw.error = rc;
1794 #ifdef WITH_LIBPTH
1795                             pth_write(p[1], &pw, sizeof(pw));
1796 #else
1797                             write(p[1], &pw, sizeof(pw));
1798 #endif
1799                             close(p[1]);
1800                             _exit(1);
1801                         }
1802
1803                         /*
1804                          * Don't count the time it takes to open the file
1805                          * which may have many iterations.
1806                          */
1807                         signal(SIGALRM, SIG_DFL);
1808                         rc = do_open_command(pwm, filename, password);
1809
1810                         if (pwm->pinentry_timeout)
1811                             signal(SIGALRM, catchsig);
1812
1813                         if (pwm->pctx && rc == EPWMD_BADKEY) {
1814                             if (pin_try-- > 0)
1815                                 goto getpin_nb_again;
1816
1817                             goto getpin_nb_fail;
1818                         }
1819
1820                         pinentry_disconnect(pwm);
1821                         pw.error = 0;
1822 #ifdef WITH_LIBPTH
1823                         pth_write(p[1], &pw, sizeof(pw));
1824 #else
1825                         write(p[1], &pw, sizeof(pw));
1826 #endif
1827                         close(p[1]);
1828                         _exit(0);
1829                         break;
1830                     case -1:
1831                         rc = gpg_error_from_syserror();
1832                         close(p[0]);
1833                         close(p[1]);
1834                         return rc;
1835                     default:
1836                         break;
1837                 }
1838
1839                 close(p[1]);
1840                 pwm->nb_fd = p[0];
1841                 return 0;
1842             }
1843         }
1844         else {
1845 #endif
1846             /*
1847              * Not using pinentry and the file was not found
1848              * in the cache.
1849              */
1850             password = pwm->password;
1851 #ifdef WITH_PINENTRY
1852         }
1853 #endif
1854     }
1855     else if (rc)
1856         return rc;
1857
1858 gotpassword:
1859     rc = do_open_command(pwm, filename, password);
1860
1861     /*
1862      * Keep the user defined password set with pwmd_setopt(). The password may
1863      * be needed later (pwmd_save()) depending on the pwmd file cache settings.
1864      */
1865     if (!pwm->passfunc && password && password != pwm->password)
1866         pwmd_free(password);
1867
1868 #ifdef WITH_PINENTRY
1869     if (rc == EPWMD_BADKEY) {
1870         if (pin_try-- > 0 && !nb) {
1871             rc = pwmd_command(pwm, &result, "OPTION TITLE=%s",
1872                     N_("Invalid passphrase, please try again."));
1873
1874             if (rc)
1875                 return rc;
1876
1877             goto gotpassword;
1878         }
1879
1880         if (nb)
1881             pinentry_disconnect(pwm);
1882
1883         return rc;
1884     }
1885 #endif
1886
1887     if (!rc) {
1888         if (pwm->filename)
1889             pwmd_free(pwm->filename);
1890
1891         pwm->filename = pwmd_strdup(filename);
1892     }
1893
1894     return rc;
1895 }
1896
1897 gpg_error_t pwmd_open(pwm_t *pwm, const char *filename)
1898 {
1899     return do_pwmd_open(pwm, filename, 0);
1900 }
1901
1902 gpg_error_t pwmd_open_async2(pwm_t *pwm, const char *filename)
1903 {
1904 #ifndef WITH_PINENTRY
1905     return GPG_ERR_NOT_IMPLEMENTED;
1906 #else
1907     gpg_error_t rc;
1908
1909     pwm->cmd = ASYNC_CMD_OPEN2;
1910     pwm->state = ASYNC_PROCESS;
1911     rc = do_pwmd_open(pwm, filename, 1);
1912
1913     if (rc)
1914         reset_async(pwm);
1915
1916     return rc;
1917 #endif
1918 }
1919
1920 #ifdef WITH_PINENTRY
1921 static gpg_error_t do_save_getpin(pwm_t *pwm, char **password)
1922 {
1923     int confirm = 0;
1924     gpg_error_t error;
1925     char *result = NULL;
1926     int pin_try = -1;
1927
1928 again:
1929     error = getpin(pwm, &result, &pin_try, confirm ? 2 : 0);
1930
1931     if (error) {
1932         if (pwm->pctx)
1933             pinentry_disconnect(pwm);
1934
1935         if (*password)
1936             pwmd_free(*password);
1937
1938         return error;
1939     }
1940
1941     if (!confirm++) {
1942         *password = result;
1943         goto again;
1944     }
1945
1946     if (strcmp(*password, result)) {
1947         pwmd_free(*password);
1948         pwmd_free(result);
1949         pinentry_disconnect(pwm);
1950         error = EPWMD_BADKEY;
1951         return error;
1952     }
1953
1954     pwmd_free(result);
1955     pinentry_disconnect(pwm);
1956     return 0;
1957 }
1958 #endif
1959
1960 static gpg_error_t do_save_command(pwm_t *pwm, char *password)
1961 {
1962     char buf[ASSUAN_LINELENGTH];
1963     gpg_error_t error;
1964     char *result = NULL;
1965
1966     snprintf(buf, sizeof(buf), "SAVE %s", password ? password : "");
1967     error = send_command(pwm, &result, buf);
1968     memset(&buf, 0, sizeof(buf));
1969
1970     if (error && result)
1971         pwmd_free(result);
1972
1973     return error;
1974 }
1975
1976 static gpg_error_t do_pwmd_save(pwm_t *pwm, int nb)
1977 {
1978     char *result = NULL;
1979     char *password = NULL;
1980     gpg_error_t rc;
1981
1982     if (!pwm)
1983         return GPG_ERR_INV_ARG;
1984
1985     if (pwm->use_pinentry || pwm->passfunc) {
1986         rc = pwmd_command(pwm, &result, "ISCACHED %s", pwm->filename);
1987
1988         if (rc == EPWMD_CACHE_NOT_FOUND) {
1989             if (pwm->passfunc)
1990                 password = (char *)(*pwm->passfunc)(pwm->passdata);
1991 #ifdef WITH_PINENTRY
1992             else if (pwm->use_pinentry) {
1993                 if (nb) {
1994                     int p[2];
1995                     pid_t pid;
1996                     pwmd_nb_status_t pw;
1997
1998                     if (pipe(p) == -1)
1999                         return gpg_error_from_syserror();
2000
2001 #ifdef WITH_LIBPTH
2002                     pid = pth_fork();
2003 #else
2004                     pid = fork();
2005 #endif
2006
2007                     switch (pid) {
2008                         case 0:
2009                             close(p[0]);
2010                             pw.fd = p[0];
2011
2012                             do {
2013                                 password = NULL;
2014                                 rc = do_save_getpin(pwm, &password);
2015                             } while (rc == EPWMD_BADKEY);
2016
2017                             if (rc) {
2018                                 if (pwm->pctx)
2019                                     pinentry_disconnect(pwm);
2020
2021                                 pw.error = rc;
2022 #ifdef WITH_LIBPTH
2023                                 pth_write(p[1], &pw, sizeof(pw));
2024 #else
2025                                 write(p[1], &pw, sizeof(pw));
2026 #endif
2027                                 close(p[1]);
2028                                 _exit(1);
2029                             }
2030
2031                             rc = do_save_command(pwm, password);
2032                             pinentry_disconnect(pwm);
2033                             pw.error = rc;
2034 #ifdef WITH_LIBPTH
2035                             pth_write(p[1], &pw, sizeof(pw));
2036 #else
2037                             write(p[1], &pw, sizeof(pw));
2038 #endif
2039                             close(p[1]);
2040                             _exit(0);
2041                             break;
2042                         case -1:
2043                             rc = gpg_error_from_syserror();
2044                             close(p[0]);
2045                             close(p[1]);
2046                             return rc;
2047                         default:
2048                             break;
2049                     }
2050
2051                     close(p[1]);
2052                     pwm->nb_fd = p[0];
2053                     return 0;
2054                 }
2055
2056                 rc = do_save_getpin(pwm, &password);
2057
2058                 if (rc)
2059                     return rc;
2060             }
2061 #endif
2062         }
2063         else {
2064             if (rc)
2065                 return rc;
2066         }
2067     }
2068     else
2069         password = pwm->password;
2070
2071     rc = do_save_command(pwm, password);
2072
2073     if (!pwm->passfunc && password && password != pwm->password)
2074         pwmd_free(password);
2075
2076     return rc;
2077 }
2078
2079 gpg_error_t pwmd_save_async2(pwm_t *pwm)
2080 {
2081 #ifndef WITH_PINENTRY
2082     return GPG_ERR_NOT_IMPLEMENTED;
2083 #else
2084     gpg_error_t rc;
2085
2086     pwm->cmd = ASYNC_CMD_SAVE2;
2087     pwm->state = ASYNC_PROCESS;
2088     rc = do_pwmd_save(pwm, 1);
2089
2090     if (rc)
2091         reset_async(pwm);
2092
2093     return rc;
2094 #endif
2095 }
2096
2097 gpg_error_t pwmd_save(pwm_t *pwm)
2098 {
2099     return do_pwmd_save(pwm, 0);
2100 }
2101
2102 gpg_error_t pwmd_setopt(pwm_t *pwm, pwmd_option_t opt, ...)
2103 {
2104     va_list ap;
2105     int n = va_arg(ap, int);
2106     char *result;
2107     char *arg1;
2108     gpg_error_t error = 0;
2109
2110     if (!pwm)
2111         return GPG_ERR_INV_ARG;
2112
2113     va_start(ap, opt);
2114
2115     switch (opt) {
2116         case PWMD_OPTION_STATUS_FUNC:
2117             pwm->status_func = va_arg(ap, pwmd_status_fn);
2118             break;
2119         case PWMD_OPTION_STATUS_DATA:
2120             pwm->status_data = va_arg(ap, void *);
2121             break;
2122         case PWMD_OPTION_PASSWORD_FUNC:
2123             pwm->passfunc = va_arg(ap, pwmd_password_fn);
2124             break;
2125         case PWMD_OPTION_PASSWORD_DATA:
2126             pwm->passdata = va_arg(ap, void *);
2127             break;
2128         case PWMD_OPTION_PASSWORD:
2129             arg1 = va_arg(ap, char *);
2130
2131             if (pwm->password)
2132                 pwmd_free(pwm->password);
2133
2134             pwm->password = pwmd_strdup(arg1);
2135             break;
2136         case PWMD_OPTION_PINENTRY:
2137             n = va_arg(ap, int);
2138
2139             if (n != 0 && n != 1) {
2140                 va_end(ap);
2141                 error = GPG_ERR_INV_VALUE;
2142             }
2143             else {
2144                 pwm->use_pinentry = n;
2145                 error = pwmd_command(pwm, &result, "OPTION PINENTRY=%i",
2146                         !pwm->use_pinentry);
2147             }
2148             break;
2149 #ifdef WITH_PINENTRY
2150         case PWMD_OPTION_PINENTRY_TRIES:
2151             n = va_arg(ap, int);
2152
2153             if (n <= 0) {
2154                 va_end(ap);
2155                 error = GPG_ERR_INV_VALUE;
2156             }
2157             else
2158                 pwm->pinentry_tries = n;
2159             break;
2160 #endif
2161         case PWMD_OPTION_PINENTRY_TIMEOUT:
2162             n = va_arg(ap, int);
2163
2164             if (n < 0) {
2165                 va_end(ap);
2166                 error = GPG_ERR_INV_VALUE;
2167             }
2168             else
2169                 pwm->pinentry_timeout = n;
2170
2171             if (!pwm->use_pinentry)
2172                 error = pwmd_command(pwm, &result, "OPTION TIMEOUT=%i",
2173                         pwm->pinentry_timeout);
2174             break;
2175         case PWMD_OPTION_PINENTRY_PATH:
2176             if (pwm->pinentry_path)
2177                 pwmd_free(pwm->pinentry_path);
2178
2179             pwm->pinentry_path = pwmd_strdup(va_arg(ap, char *));
2180
2181             if (!pwm->use_pinentry)
2182                 error = pwmd_command(pwm, &result, "OPTION PATH=%s",
2183                         pwm->pinentry_path);
2184             break;
2185         case PWMD_OPTION_PINENTRY_TTY:
2186             if (pwm->pinentry_tty)
2187                 pwmd_free(pwm->pinentry_tty);
2188
2189             pwm->pinentry_tty = pwmd_strdup(va_arg(ap, char *));
2190
2191             if (!pwm->use_pinentry)
2192                 error = pwmd_command(pwm, &result, "OPTION TTY=%s",
2193                         pwm->pinentry_tty);
2194             break;
2195         case PWMD_OPTION_PINENTRY_DISPLAY:
2196             if (pwm->pinentry_display)
2197                 pwmd_free(pwm->pinentry_display);
2198
2199             pwm->pinentry_display = pwmd_strdup(va_arg(ap, char *));
2200
2201             if (!pwm->use_pinentry)
2202                 error = pwmd_command(pwm, &result, "OPTION DISPLAY=%s",
2203                         pwm->pinentry_display);
2204             break;
2205         case PWMD_OPTION_PINENTRY_TERM:
2206             if (pwm->pinentry_term)
2207                 pwmd_free(pwm->pinentry_term);
2208
2209             pwm->pinentry_term = pwmd_strdup(va_arg(ap, char *));
2210
2211             if (!pwm->use_pinentry)
2212                 error = pwmd_command(pwm, &result, "OPTION TTYTYPE=%s",
2213                         pwm->pinentry_term);
2214             break;
2215         case PWMD_OPTION_PINENTRY_TITLE:
2216             if (pwm->title)
2217                 pwmd_free(pwm->title);
2218
2219             pwm->title = percent_escape(va_arg(ap, char *));
2220
2221             if (!pwm->use_pinentry)
2222                 error = pwmd_command(pwm, &result, "OPTION TITLE=%s",
2223                         pwm->title);
2224             break;
2225         case PWMD_OPTION_PINENTRY_PROMPT:
2226             if (pwm->prompt)
2227                 pwmd_free(pwm->prompt);
2228
2229             pwm->prompt = percent_escape(va_arg(ap, char *));
2230
2231             if (!pwm->use_pinentry)
2232                 error = pwmd_command(pwm, &result, "OPTION PROMPT=%s",
2233                         pwm->prompt);
2234             break;
2235         case PWMD_OPTION_PINENTRY_DESC:
2236             if (pwm->desc)
2237                 pwmd_free(pwm->desc);
2238
2239             pwm->desc = percent_escape(va_arg(ap, char *));
2240
2241             if (!pwm->use_pinentry)
2242                 error = pwmd_command(pwm, &result, "OPTION DESC=%s",
2243                         pwm->desc);
2244             break;
2245         case PWMD_OPTION_PINENTRY_LC_CTYPE:
2246             if (pwm->lcctype)
2247                 pwmd_free(pwm->lcctype);
2248
2249             pwm->lcctype = pwmd_strdup(va_arg(ap, char *));
2250
2251             if (!pwm->use_pinentry)
2252                 error = pwmd_command(pwm, &result, "OPTION LC_CTYPE=%s",
2253                         pwm->lcctype);
2254             break;
2255         case PWMD_OPTION_PINENTRY_LC_MESSAGES:
2256             if (pwm->lcmessages)
2257                 pwmd_free(pwm->lcmessages);
2258
2259             pwm->lcmessages = pwmd_strdup(va_arg(ap, char *));
2260
2261             if (!pwm->use_pinentry)
2262                 error = pwmd_command(pwm, &result, "OPTION LC_MESSAGES=%s",
2263                         pwm->lcmessages);
2264             break;
2265         default:
2266             error = GPG_ERR_NOT_IMPLEMENTED;
2267             break;
2268     }
2269
2270     va_end(ap);
2271     return error;
2272 }
2273
2274 gpg_error_t pwmd_get_fd(pwm_t *pwm, int *fd)
2275 {
2276     if (!pwm)
2277         return GPG_ERR_INV_ARG;
2278
2279     if (pwm->fd == -1)
2280         return GPG_ERR_INV_STATE;
2281
2282     *fd = pwm->fd;
2283     return 0;
2284 }
2285
2286 pwm_t *pwmd_new(const char *name)
2287 {
2288     pwm_t *h = pwmd_calloc(1, sizeof(pwm_t));
2289
2290     if (!h)
2291         return NULL;
2292
2293     if (name) {
2294         h->name = pwmd_strdup(name);
2295
2296         if (!h->name) {
2297             pwmd_free(h);
2298             return NULL;
2299         }
2300     }
2301
2302     h->fd = -1;
2303 #ifdef WITH_PINENTRY
2304     h->nb_fd = -1;
2305 #endif
2306     return h;
2307 }
2308
2309 void pwmd_free(void *ptr)
2310 {
2311     xfree(ptr);
2312 }
2313
2314 void *pwmd_malloc(size_t size)
2315 {
2316     return xmalloc(size);
2317 }
2318
2319 void *pwmd_calloc(size_t nmemb, size_t size)
2320 {
2321     return xcalloc(nmemb, size);
2322 }
2323
2324 void *pwmd_realloc(void *ptr, size_t size)
2325 {
2326     return xrealloc(ptr, size);
2327 }
2328
2329 char *pwmd_strdup(const char *str)
2330 {
2331     return xstrdup(str);
2332 }