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 static gpg_error_t global_error;
  76 #endif
  77
  78 static char *_getpwuid(struct passwd *pwd)
  79 {
  80     size_t size = sysconf(_SC_GETPW_R_SIZE_MAX);
  81     struct passwd *result;
  82     char *buf;
  83     int n;
  84
  85     if (size == -1)
  86         size = 16384;
  87
  88     buf = pwmd_malloc(size);
  89
  90     if (!buf)
  91         return NULL;
  92
  93     n = getpwuid_r(getuid(), pwd, buf, size, &result);
  94
  95     if (n) {
  96         pwmd_free(buf);
  97         errno = n;
  98         return NULL;
  99     }
 100
 101     if (!result) {
 102         pwmd_free(buf);
 103         return NULL;
 104     }
 105
 106     errno = n;
 107     return buf;
 108 }
 109
 110 const char *_pwmd_strerror(gpg_error_t e)
 111 {
 112     gpg_err_code_t code = gpg_err_code(e);
 113
 114     if (code >= GPG_ERR_USER_1 && code < gpg_err_code(EPWMD_MAX)) {
 115         switch (code) {
 116             default:
 117                 return NULL;
 118             case GPG_ERR_USER_1:
 119                 return N_("Unknown error");
 120             case GPG_ERR_USER_2:
 121                 return N_("No cache slots available");
 122             case GPG_ERR_USER_3:
 123                 return N_("Recursion loop");
 124             case GPG_ERR_USER_4:
 125                 return N_("No file is open");
 126             case GPG_ERR_USER_5:
 127                 return N_("General LibXML error");
 128             case GPG_ERR_USER_6:
 129                 return N_("File modified");
 130             case GPG_ERR_USER_7:
 131                 return N_("Access denied");
 132         }
 133     }
 134
 135     return NULL;
 136 }
 137
 138 const char *pwmd_strerror(gpg_error_t e)
 139 {
 140     const char *p = _pwmd_strerror(e);
 141
 142     return p ? p : gpg_strerror(e);
 143 }
 144
 145 int pwmd_strerror_r(gpg_error_t e, char *buf, size_t size)
 146 {
 147     const char *p = _pwmd_strerror(e);
 148
 149     if (p) {
 150         snprintf(buf, size, "%s", p);
 151
 152         if (strlen(p) > size)
 153             return ERANGE;
 154
 155         return 0;
 156     }
 157
 158     return gpg_strerror_r(e, buf, size);
 159 }
 160
 161 gpg_error_t pwmd_init()
 162 {
 163     static int initialized;
 164
 165     if (initialized)
 166         return 0;
 167
 168 #ifndef MEM_DEBUG
 169     xmem_init();
 170 #endif
 171 #ifdef ENABLE_NLS
 172     bindtextdomain("libpwmd", LOCALEDIR);
 173 #endif
 174     gpg_err_init();
 175     assuan_set_malloc_hooks(pwmd_malloc, pwmd_realloc, pwmd_free);
 176     assuan_set_assuan_err_source(GPG_ERR_SOURCE_DEFAULT);
 177     initialized = 1;
 178     return 0;
 179 }
 180
 181 static gpg_error_t _socket_connect_finalize(pwm_t *pwm)
 182 {
 183     int active[2];
 184     int n = assuan_get_active_fds(pwm->ctx, 0, active, N_ARRAY(active));
 185
 186     pwm->fd = n <= 0 ? -1 : dup(active[0]);
 187 #ifdef WITH_PINENTRY
 188     pwm->pid = -1;
 189     pwm->pinentry_tries = 3;
 190 #endif
 191     assuan_set_pointer(pwm->ctx, pwm);
 192
 193     if (pwm->name)
 194         return pwmd_command(pwm, NULL, "OPTION CLIENT NAME=%s", pwm->name);
 195
 196     return 0;
 197 }
 198
 199 #ifdef WITH_TCP
 200 static int read_hook(assuan_context_t ctx, assuan_fd_t fd, void *data,
 201         size_t len, ssize_t *ret)
 202 {
 203     pwm_t *pwm = assuan_get_pointer(ctx);
 204
 205     if (!pwm || !pwm->tcp_conn)
 206 #ifdef WITH_LIBPTH
 207         *ret = pth_read((int)fd, data, len);
 208 #else
 209         *ret = read((int)fd, data, len);
 210 #endif
 211     else {
 212         do {
 213             *ret = libssh2_channel_read(pwm->tcp_conn->channel, data, len);
 214         } while (*ret == LIBSSH2_ERROR_EAGAIN);
 215     }
 216
 217     return *ret <= 0 ? 0 : 1;
 218 }
 219
 220 static int write_hook(assuan_context_t ctx, assuan_fd_t fd, const void *data,
 221         size_t len, ssize_t *ret)
 222 {
 223     pwm_t *pwm = assuan_get_pointer(ctx);
 224
 225     if (!pwm || !pwm->tcp_conn)
 226 #ifdef WITH_LIBPTH
 227         *ret = pth_write((int)fd, data, len);
 228 #else
 229         *ret = write((int)fd, data, len);
 230 #endif
 231     else {
 232         do {
 233             *ret = libssh2_channel_write(pwm->tcp_conn->channel, data, len);
 234         } while (*ret == LIBSSH2_ERROR_EAGAIN);
 235     }
 236
 237     return *ret <= 0 ? 0 : 1;
 238 }
 239
 240 static void _ssh_deinit(pwmd_tcp_conn_t *conn);
 241 static void free_tcp_conn(pwmd_tcp_conn_t *conn)
 242 {
 243     if (!conn)
 244         return;
 245
 246     if (conn->username) {
 247         pwmd_free(conn->username);
 248         conn->username = NULL;
 249     }
 250
 251     if (conn->known_hosts) {
 252         pwmd_free(conn->known_hosts);
 253         conn->known_hosts = NULL;
 254     }
 255
 256     if (conn->identity) {
 257         pwmd_free(conn->identity);
 258         conn->identity = NULL;
 259     }
 260
 261     if (conn->identity_pub) {
 262         pwmd_free(conn->identity_pub);
 263         conn->identity_pub = NULL;
 264     }
 265
 266     if (conn->host) {
 267         pwmd_free(conn->host);
 268         conn->host = NULL;
 269     }
 270
 271     if (conn->hostkey) {
 272         pwmd_free(conn->hostkey);
 273         conn->hostkey = NULL;
 274     }
 275
 276     if (conn->chan) {
 277         ares_destroy(conn->chan);
 278         conn->chan = NULL;
 279     }
 280
 281     if (conn->he) {
 282         ares_free_hostent(conn->he);
 283         conn->he = NULL;
 284     }
 285
 286     if (conn->fd >= 0) {
 287         close(conn->fd);
 288         conn->fd = -1;
 289     }
 290
 291     if (conn->session)
 292         _ssh_deinit(conn);
 293     else
 294         pwmd_free(conn);
 295 }
 296
 297 static void _ssh_deinit(pwmd_tcp_conn_t *conn)
 298 {
 299     if (!conn)
 300         return;
 301
 302     if (conn->channel)
 303         libssh2_channel_free(conn->channel);
 304
 305     if (conn->session) {
 306         libssh2_session_disconnect(conn->session, "Bye!");
 307         libssh2_session_free(conn->session);
 308     }
 309
 310     conn->session = NULL;
 311     conn->channel = NULL;
 312     free_tcp_conn(conn);
 313 }
 314
 315 static void _ssh_assuan_deinit(assuan_context_t ctx)
 316 {
 317     pwm_t *pwm = assuan_get_pointer(ctx);
 318
 319     _ssh_deinit(pwm->tcp_conn);
 320     pwm->tcp_conn = NULL;
 321 }
 322
 323 /*
 324  * Sets common options from both pwmd_tcp_connect() and
 325  * pwmd_tcp_connect_async().
 326  */
 327 static gpg_error_t init_tcp_conn(pwmd_tcp_conn_t **dst, const char *host,
 328         int port, const char *identity, const char *user, const char *hosts,
 329         int get)
 330 {
 331     pwmd_tcp_conn_t *conn;
 332     gpg_error_t rc = 0;
 333
 334     if (get) {
 335         if (!host)
 336             return GPG_ERR_INV_ARG;
 337     }
 338     else {
 339         if (!host || !identity || !hosts)
 340             return GPG_ERR_INV_ARG;
 341     }
 342
 343     conn = pwmd_calloc(1, sizeof(pwmd_tcp_conn_t));
 344
 345     if (!conn)
 346         return gpg_error_from_errno(ENOMEM);
 347
 348     conn->port = port == -1 ? 22 : port;
 349     conn->host = pwmd_strdup(host);
 350
 351     if (!conn->host) {
 352         rc = gpg_error_from_errno(ENOMEM);
 353         goto fail;
 354     }
 355
 356     if (!get) {
 357         struct passwd pw;
 358         char *pwbuf = _getpwuid(&pw);
 359
 360         if (!pwbuf) {
 361             rc = gpg_error_from_errno(errno);
 362             goto fail;
 363         }
 364
 365         conn->username = pwmd_strdup(user ? user : pw.pw_name);
 366         pwmd_free(pwbuf);
 367
 368         if (!conn->username) {
 369             rc = gpg_error_from_errno(ENOMEM);
 370             goto fail;
 371         }
 372
 373         conn->identity = pwmd_strdup(identity);
 374
 375         if (!conn->identity) {
 376             rc = gpg_error_from_errno(ENOMEM);
 377             goto fail;
 378         }
 379
 380         conn->identity_pub = pwmd_malloc(strlen(conn->identity)+5);
 381
 382         if (!conn->identity_pub) {
 383             rc = gpg_error_from_errno(ENOMEM);
 384             goto fail;
 385         }
 386
 387         sprintf(conn->identity_pub, "%s.pub", conn->identity);
 388         conn->known_hosts = pwmd_strdup(hosts);
 389
 390         if (!conn->known_hosts) {
 391             rc = gpg_error_from_errno(ENOMEM);
 392             goto fail;
 393         }
 394     }
 395
 396     *dst = conn;
 397     return 0;
 398
 399 fail:
 400     free_tcp_conn(conn);
 401     return rc;
 402 }
 403
 404 static gpg_error_t do_connect(pwm_t *pwm, int prot, void *addr)
 405 {
 406     struct sockaddr_in their_addr;
 407
 408     pwm->tcp_conn->fd = socket(prot, SOCK_STREAM, 0);
 409
 410     if (pwm->tcp_conn->fd == -1)
 411         return gpg_error_from_syserror();
 412
 413     if (pwm->tcp_conn->async)
 414         fcntl(pwm->tcp_conn->fd, F_SETFL, O_NONBLOCK);
 415
 416     pwm->cmd = ASYNC_CMD_CONNECT;
 417     their_addr.sin_family = prot;
 418     their_addr.sin_port = htons(pwm->tcp_conn->port);
 419     their_addr.sin_addr = *((struct in_addr *)addr);
 420     memset(their_addr.sin_zero, '\0', sizeof their_addr.sin_zero);
 421
 422 #ifdef WITH_LIBPTH
 423     if (pth_connect(pwm->tcp_conn->fd, (struct sockaddr *)&their_addr,
 424                 sizeof(their_addr)) == -1)
 425 #else
 426     if (connect(pwm->tcp_conn->fd, (struct sockaddr *)&their_addr,
 427                 sizeof(their_addr)) == -1)
 428 #endif
 429         return gpg_error_from_syserror();
 430
 431     return 0;
 432 }
 433
 434 static gpg_error_t ares_error_to_pwmd(int status)
 435 {
 436     if (status != ARES_SUCCESS)
 437         warnx("%s", ares_strerror(status));
 438
 439     switch (status) {
 440         case ARES_ENODATA:
 441         case ARES_EFORMERR:
 442         case ARES_ENOTFOUND:
 443             return GPG_ERR_UNKNOWN_HOST;
 444         case ARES_ESERVFAIL:
 445              return GPG_ERR_EHOSTDOWN;
 446         case ARES_ETIMEOUT:
 447             return GPG_ERR_TIMEOUT;
 448         case ARES_ENOMEM:
 449             return gpg_error_from_errno(ENOMEM);
 450         case ARES_ECONNREFUSED:
 451             return GPG_ERR_ECONNREFUSED;
 452         default:
 453             /* FIXME ??? */
 454             return GPG_ERR_EHOSTUNREACH;
 455     }
 456
 457     return ARES_SUCCESS;
 458 }
 459
 460 static void dns_resolve_cb(void *arg, int status, int timeouts,
 461         unsigned char *abuf, int alen)
 462 {
 463     pwm_t *pwm = arg;
 464     int rc;
 465     struct hostent *he;
 466
 467     if (status == ARES_EDESTRUCTION)
 468         return;
 469
 470     if (status != ARES_SUCCESS) {
 471         pwm->tcp_conn->rc = ares_error_to_pwmd(status);
 472         return;
 473     }
 474
 475     //FIXME localhost. works with ipv4. maybe local system config error
 476     /* Check for an IPv6 address first. */
 477     rc = ares_parse_a_reply(abuf, alen, &he, NULL, NULL);
 478
 479     if (rc != ARES_SUCCESS) {
 480         if (rc != ARES_ENODATA) {
 481             pwm->tcp_conn->rc = ares_error_to_pwmd(status);
 482             return;
 483         }
 484
 485         rc = ares_parse_aaaa_reply(abuf, alen, &he, NULL, NULL);
 486
 487         if (rc != ARES_SUCCESS) {
 488             pwm->tcp_conn->rc = ares_error_to_pwmd(status);
 489             return;
 490         }
 491     }
 492
 493     pwm->tcp_conn->he = he;
 494     pwm->tcp_conn->rc = do_connect(pwm, he->h_addrtype, he->h_addr);
 495 }
 496
 497 static gpg_error_t _do_pwmd_tcp_connect_async(pwm_t *pwm, const char *host,
 498         int port, const char *identity, const char *user,
 499         const char *known_hosts, pwmd_async_cmd_t which)
 500 {
 501     pwmd_tcp_conn_t *conn;
 502     gpg_error_t rc;
 503
 504     rc = init_tcp_conn(&conn, host, port, identity, user, known_hosts,
 505             which == ASYNC_CMD_HOSTKEY ? 1 : 0);
 506
 507     if (rc)
 508         return rc;
 509
 510     conn->async = 1;
 511     pwm->tcp_conn = conn;
 512     pwm->tcp_conn->cmd = which;
 513
 514     if (pwm->tcp_conn->cmd == ASYNC_CMD_HOSTKEY)
 515         pwm->tcp_conn->get_only = 1;
 516
 517     pwm->cmd = ASYNC_CMD_DNS;
 518     pwm->state = ASYNC_PROCESS;
 519     ares_init(&pwm->tcp_conn->chan);
 520     ares_query(pwm->tcp_conn->chan, pwm->tcp_conn->host, ns_c_any, ns_t_any,
 521             dns_resolve_cb, pwm);
 522     return 0;
 523 }
 524
 525 gpg_error_t pwmd_tcp_connect_async(pwm_t *pwm, const char *host, int port,
 526         const char *identity, const char *user, const char *known_hosts)
 527 {
 528     return _do_pwmd_tcp_connect_async(pwm, host, port, identity, user,
 529             known_hosts, ASYNC_CMD_CONNECT);
 530 }
 531
 532 static void *_ssh_malloc(size_t size, void **data)
 533 {
 534     return pwmd_malloc(size);
 535 }
 536
 537 static void _ssh_free(void *ptr, void **data)
 538 {
 539     pwmd_free(ptr);
 540 }
 541
 542 static void *_ssh_realloc(void *ptr, size_t size, void **data)
 543 {
 544     return pwmd_realloc(ptr, size);
 545 }
 546
 547 static char *to_hex(const char *str, size_t slen)
 548 {
 549     int i;
 550     char *buf = pwmd_malloc(slen*2+1);
 551
 552     if (!buf)
 553         return NULL;
 554
 555     for (i = 0, buf[0] = 0; i < slen; i++) {
 556         char tmp[3];
 557
 558         sprintf(tmp, "%02x", (unsigned char)str[i]);
 559         strcat(buf, tmp);
 560     }
 561
 562     return buf;
 563 }
 564
 565 static int verify_host_key(pwm_t *pwm)
 566 {
 567     FILE *fp = fopen(pwm->tcp_conn->known_hosts, "r");
 568     char *buf, *p;
 569
 570     if (!fp)
 571         return 1;
 572
 573     buf = pwmd_malloc(LINE_MAX);
 574
 575     if (!buf)
 576         goto fail;
 577
 578     while ((p = fgets(buf, LINE_MAX, fp))) {
 579         if (*p == '#' || isspace(*p))
 580             continue;
 581
 582         if (p[strlen(p)-1] == '\n')
 583             p[strlen(p)-1] = 0;
 584
 585         if (!strcmp(buf, pwm->tcp_conn->hostkey))
 586             goto done;
 587     }
 588
 589 fail:
 590     if (buf)
 591         pwmd_free(buf);
 592
 593     fclose(fp);
 594     return 1;
 595
 596 done:
 597     pwmd_free(buf);
 598     fclose(fp);
 599     return 0;
 600 }
 601
 602 static gpg_error_t authenticate_ssh(pwm_t *pwm)
 603 {
 604     const char *fp = libssh2_hostkey_hash(pwm->tcp_conn->session,
 605             LIBSSH2_HOSTKEY_HASH_SHA1);
 606     char *userauth;
 607
 608     pwm->tcp_conn->hostkey = to_hex(fp, 20);
 609
 610     if (!pwm->tcp_conn->hostkey)
 611         return gpg_error_from_errno(ENOMEM);
 612
 613     if (pwm->tcp_conn->get_only)
 614         return 0;
 615
 616     if (!fp || verify_host_key(pwm))
 617         return GPG_ERR_CHECKSUM;
 618
 619     userauth = libssh2_userauth_list(pwm->tcp_conn->session,
 620             pwm->tcp_conn->username, strlen(pwm->tcp_conn->username));
 621
 622     if (!userauth || !strstr(userauth, "publickey"))
 623         return GPG_ERR_BAD_PIN_METHOD;
 624
 625     if (libssh2_userauth_publickey_fromfile(pwm->tcp_conn->session,
 626                 pwm->tcp_conn->username, pwm->tcp_conn->identity_pub,
 627                 pwm->tcp_conn->identity, NULL))
 628         return GPG_ERR_BAD_SECKEY;
 629
 630     return 0;
 631 }
 632
 633 static gpg_error_t setup_tcp_session(pwm_t *pwm)
 634 {
 635     assuan_context_t ctx;
 636     struct assuan_io_hooks io_hooks = {read_hook, write_hook};
 637     gpg_error_t rc;
 638
 639     pwm->tcp_conn->session = libssh2_session_init_ex(_ssh_malloc, _ssh_free,
 640             _ssh_realloc, NULL);
 641
 642     if (!pwm->tcp_conn->session) {
 643         rc = gpg_error_from_errno(ENOMEM);
 644         goto fail;
 645     }
 646
 647     if (libssh2_session_startup(pwm->tcp_conn->session, pwm->tcp_conn->fd)) {
 648         rc = GPG_ERR_ASSUAN_SERVER_FAULT;
 649         goto fail;
 650     }
 651
 652     rc = authenticate_ssh(pwm);
 653
 654     if (rc)
 655         goto fail;
 656
 657     /* pwmd_get_hostkey(). */
 658     if (pwm->tcp_conn->get_only) {
 659         pwm->result = pwmd_strdup(pwm->tcp_conn->hostkey);
 660
 661         if (!pwm->result) {
 662             rc = gpg_error_from_errno(ENOMEM);
 663             goto fail;
 664         }
 665
 666         return 0;
 667     }
 668
 669     pwm->tcp_conn->channel = libssh2_channel_open_session(pwm->tcp_conn->session);
 670
 671     if (!pwm->tcp_conn->channel) {
 672         rc = GPG_ERR_ASSUAN_SERVER_FAULT;
 673         goto fail;
 674     }
 675
 676     if (libssh2_channel_shell(pwm->tcp_conn->channel)) {
 677         rc = GPG_ERR_ASSUAN_SERVER_FAULT;
 678         goto fail;
 679     }
 680
 681     assuan_set_io_hooks(&io_hooks);
 682     rc = assuan_socket_connect_fd(&ctx, pwm->tcp_conn->fd, 0, pwm);
 683
 684     if (rc)
 685         goto fail;
 686
 687     assuan_set_finish_handler(ctx, _ssh_assuan_deinit);
 688     pwm->ctx = ctx;
 689     return _socket_connect_finalize(pwm);
 690
 691 fail:
 692     free_tcp_conn(pwm->tcp_conn);
 693     pwm->tcp_conn = NULL;
 694     return rc;
 695 }
 696
 697 static gpg_error_t _do_pwmd_tcp_connect(pwm_t *pwm, const char *host, int port,
 698         const char *identity, const char *user, const char *known_hosts, int get)
 699 {
 700     pwmd_tcp_conn_t *conn;
 701     gpg_error_t rc;
 702
 703     rc = init_tcp_conn(&conn, host, port, identity, user, known_hosts, get);
 704
 705     if (rc)
 706         return rc;
 707
 708     pwm->tcp_conn = conn;
 709     pwm->tcp_conn->get_only = get;
 710     pwm->cmd = ASYNC_CMD_DNS;
 711     ares_init(&pwm->tcp_conn->chan);
 712     ares_query(pwm->tcp_conn->chan, pwm->tcp_conn->host, ns_c_any, ns_t_any,
 713             dns_resolve_cb, pwm);
 714
 715     /* dns_resolve_cb() may have already been called. */
 716     if (pwm->tcp_conn->rc) {
 717         rc = pwm->tcp_conn->rc;
 718         goto fail;
 719     }
 720
 721     /*
 722      * Fake a blocking DNS lookup. libcares does a better job than
 723      * getaddrinfo().
 724      */
 725     do {
 726         fd_set rfds, wfds;
 727         int n;
 728         struct timeval tv;
 729
 730         FD_ZERO(&rfds);
 731         FD_ZERO(&wfds);
 732         n = ares_fds(pwm->tcp_conn->chan, &rfds, &wfds);
 733         ares_timeout(pwm->tcp_conn->chan, NULL, &tv);
 734 #ifdef WITH_LIBPTH
 735         n = pth_select(n, &rfds, &wfds, NULL, &tv);
 736 #else
 737         n = select(n, &rfds, &wfds, NULL, &tv);
 738 #endif
 739
 740         if (n == -1) {
 741             rc = gpg_error_from_syserror();
 742             goto fail;
 743         }
 744         else if (n == 0) {
 745             rc = GPG_ERR_TIMEOUT;
 746             goto fail;
 747         }
 748
 749         ares_process(pwm->tcp_conn->chan, &rfds, &wfds);
 750
 751         if (pwm->tcp_conn->rc)
 752             break;
 753     } while (pwm->cmd == ASYNC_CMD_DNS);
 754
 755     if (pwm->tcp_conn->rc) {
 756         rc = pwm->tcp_conn->rc;
 757         goto fail;
 758     }
 759
 760     return setup_tcp_session(pwm);
 761
 762 fail:
 763     return rc;
 764 }
 765
 766 gpg_error_t pwmd_tcp_connect(pwm_t *pwm, const char *host, int port,
 767         const char *identity, const char *user, const char *known_hosts)
 768 {
 769     return _do_pwmd_tcp_connect(pwm, host, port, identity, user, known_hosts, 0);
 770 }
 771
 772 /* Must free the result with pwmd_free(). */
 773 gpg_error_t pwmd_get_hostkey(const char *host, int port, char **result)
 774 {
 775     char *hostkey;
 776     pwm_t *pwm = pwmd_new(NULL);
 777     gpg_error_t rc;
 778
 779     if (!pwm)
 780         return gpg_error_from_errno(ENOMEM);
 781
 782     rc = _do_pwmd_tcp_connect(pwm, host, port, NULL, NULL, NULL, 1);
 783
 784     if (rc) {
 785         pwmd_close(pwm);
 786         return rc;
 787     }
 788
 789     hostkey = pwmd_strdup(pwm->tcp_conn->hostkey);
 790
 791     if (!hostkey)
 792         rc = gpg_error_from_errno(ENOMEM);
 793
 794     pwmd_close(pwm);
 795     *result = hostkey;
 796     return rc;
 797 }
 798
 799 gpg_error_t pwmd_get_hostkey_async(pwm_t *pwm, const char *host, int port)
 800 {
 801     return _do_pwmd_tcp_connect_async(pwm, host, port, NULL, NULL, NULL,
 802             ASYNC_CMD_HOSTKEY);
 803 }
 804 #endif
 805
 806 gpg_error_t pwmd_connect(pwm_t *pwm, const char *path)
 807 {
 808     char *socketpath = NULL;
 809     assuan_context_t ctx;
 810     struct passwd pw;
 811     char *pwbuf = _getpwuid(&pw);
 812     gpg_error_t rc;
 813
 814     if (!pwbuf)
 815         return gpg_error_from_errno(errno);
 816
 817     if (!path) {
 818         socketpath = (char *)pwmd_malloc(strlen(pw.pw_dir) + strlen("/.pwmd/socket") + 1);
 819         sprintf(socketpath, "%s/.pwmd/socket", pw.pw_dir);
 820     }
 821     else
 822         socketpath = pwmd_strdup(path);
 823
 824     pwmd_free(pwbuf);
 825     rc = assuan_socket_connect_ext(&ctx, socketpath, -1, 0);
 826     pwmd_free(socketpath);
 827
 828     if (rc)
 829         return rc;
 830
 831     pwm->ctx = ctx;
 832     return _socket_connect_finalize(pwm);
 833 }
 834
 835 void pwmd_close(pwm_t *pwm)
 836 {
 837     if (!pwm)
 838         return;
 839
 840     if (pwm->ctx)
 841         assuan_disconnect(pwm->ctx);
 842
 843     if (pwm->password)
 844         pwmd_free(pwm->password);
 845
 846     if (pwm->title)
 847         pwmd_free(pwm->title);
 848
 849     if (pwm->desc)
 850         pwmd_free(pwm->desc);
 851
 852     if (pwm->prompt)
 853         pwmd_free(pwm->prompt);
 854
 855     if (pwm->pinentry_tty)
 856         pwmd_free(pwm->pinentry_tty);
 857
 858     if (pwm->pinentry_display)
 859         pwmd_free(pwm->pinentry_display);
 860
 861     if (pwm->pinentry_term)
 862         pwmd_free(pwm->pinentry_term);
 863
 864     if (pwm->lcctype)
 865         pwmd_free(pwm->lcctype);
 866
 867     if (pwm->lcmessages)
 868         pwmd_free(pwm->lcmessages);
 869
 870     if (pwm->filename)
 871         pwmd_free(pwm->filename);
 872
 873     if (pwm->name)
 874         pwmd_free(pwm->name);
 875
 876 #ifdef WITH_TCP
 877     if (pwm->tcp_conn)
 878         free_tcp_conn(pwm->tcp_conn);
 879 #endif
 880
 881     pwmd_free(pwm);
 882 }
 883
 884 static int mem_realloc_cb(void *data, const void *buffer, size_t len)
 885 {
 886     membuf_t *mem = (membuf_t *)data;
 887     void *p;
 888
 889     if (!buffer)
 890         return 0;
 891
 892     if ((p = pwmd_realloc(mem->buf, mem->len + len)) == NULL)
 893         return 1;
 894
 895     mem->buf = p;
 896     memcpy((char *)mem->buf + mem->len, buffer, len);
 897     mem->len += len;
 898     return 0;
 899 }
 900
 901 static int _inquire_cb(void *data, const char *keyword)
 902 {
 903     pwm_t *pwm = (pwm_t *)data;
 904     gpg_error_t rc = 0;
 905     int flags = fcntl(pwm->fd, F_GETFL);
 906
 907     /* Shouldn't get this far without a callback. */
 908     if (!pwm->inquire_func)
 909         return GPG_ERR_INV_ARG;
 910
 911     /*
 912      * Since the socket file descriptor is probably set to non-blocking, set to
 913      * blocking to prevent GPG_ERR_EAGAIN errors. This should be fixes when
 914      * asynchronous INQUIRE is supported by either libassuan or a later
 915      * libpwmd.
 916      */
 917     fcntl(pwm->fd, F_SETFL, 0);
 918
 919     for (;;) {
 920         char *result = NULL;
 921         size_t len;
 922         gpg_error_t arc;
 923
 924         rc = pwm->inquire_func(pwm->inquire_data, keyword, rc, &result, &len);
 925         rc = gpg_err_code(rc);
 926
 927         if (rc == GPG_ERR_EOF || !rc) {
 928             if (len <= 0 || !result || !*result) {
 929                 rc = 0;
 930                 break;
 931             }
 932
 933             arc = assuan_send_data(pwm->ctx, result, len);
 934
 935             if (rc == GPG_ERR_EOF) {
 936                 rc = arc;
 937                 break;
 938             }
 939
 940             rc = arc;
 941         }
 942         else if (rc)
 943             break;
 944     }
 945
 946     fcntl(pwm->fd, F_SETFL, flags);
 947     return rc;
 948 }
 949
 950 gpg_error_t pwmd_finalize(pwm_t *pwm)
 951 {
 952     if (!pwm)
 953         return GPG_ERR_INV_ARG;
 954
 955     if (pwm->cmd == ASYNC_CMD_NONE || pwm->state != ASYNC_DONE)
 956         return GPG_ERR_INV_STATE;
 957
 958     pwm->state = ASYNC_INIT;
 959     pwm->cmd = ASYNC_CMD_NONE;
 960
 961 #ifdef WITH_TCP
 962     if (pwm->cmd == ASYNC_CMD_CONNECT || pwm->cmd == ASYNC_CMD_DNS) {
 963         gpg_error_t rc = pwm->tcp_conn->rc;
 964
 965         /* pwm is no longer a valid handle. */
 966         if (rc)
 967             pwmd_close(pwm);
 968
 969         return 0;
 970     }
 971 #endif
 972
 973     if (pwm->fd < 0)
 974         return GPG_ERR_INV_ARG;
 975
 976     pwm->ntries = 0;
 977 #ifdef WITH_PINENTRY
 978     pwm->is_open_cmd = 0;
 979 #endif
 980     return 0;
 981 }
 982
 983 static gpg_error_t do_nb_command(pwm_t *pwm, const char *cmd, const char *arg)
 984 {
 985     char *buf;
 986     gpg_error_t rc;
 987     size_t len = strlen(cmd) + 2;
 988
 989     len += arg ? strlen(arg) : 0;
 990
 991     if (pwm->state != ASYNC_INIT)
 992         return GPG_ERR_INV_STATE;
 993
 994     buf = (char *)pwmd_malloc(len);
 995
 996     if (!buf) {
 997         rc = gpg_error_from_errno(ENOMEM);
 998         goto fail;
 999     }
1000
1001     snprintf(buf, len, "%s %s", cmd, arg ? arg : "");
1002     rc = assuan_write_line(pwm->ctx, buf);
1003     pwmd_free(buf);
1004
1005     if (!rc)
1006         pwm->state = ASYNC_PROCESS;
1007
1008 fail:
1009     return rc;
1010 }
1011
1012 gpg_error_t pwmd_open_async(pwm_t *pwm, const char *filename)
1013 {
1014     if (!pwm || !filename)
1015         return GPG_ERR_INV_ARG;
1016
1017     /* For pinentry retries. */
1018     if (!pwm->is_open_cmd) {
1019         if (pwm->filename)
1020             pwmd_free(pwm->filename);
1021
1022         pwm->filename = pwmd_strdup(filename);
1023     }
1024
1025     pwm->is_open_cmd = 1;
1026     pwm->cmd = ASYNC_CMD_OPEN;
1027     return do_nb_command(pwm, "OPEN", filename);
1028 }
1029
1030 gpg_error_t pwmd_save_async(pwm_t *pwm)
1031 {
1032     if (!pwm)
1033         return GPG_ERR_INV_ARG;
1034
1035     pwm->cmd = ASYNC_CMD_SAVE;
1036     return do_nb_command(pwm, "SAVE", NULL);
1037 }
1038
1039 static gpg_error_t parse_assuan_line(pwm_t *pwm)
1040 {
1041     gpg_error_t rc;
1042     char *line;
1043     size_t len;
1044
1045     rc = assuan_read_line(pwm->ctx, &line, &len);
1046
1047     if (!rc) {
1048         if (line[0] == 'O' && line[1] == 'K' &&
1049                 (line[2] == 0 || line[2] == ' ')) {
1050             pwm->state = ASYNC_DONE;
1051         }
1052         else if (line[0] == '#') {
1053         }
1054         else if (line[0] == 'S' && (line[1] == 0 || line[1] == ' ')) {
1055             if (pwm->status_func) {
1056                 pwm->status_func(pwm->status_data,
1057                         line[1] == 0 ? line+1 : line+2);
1058             }
1059         }
1060         else if (line[0] == 'E' && line[1] == 'R' && line[2] == 'R' &&
1061                 (line[3] == 0 || line[3] == ' ')) {
1062             line += 4;
1063             rc = atoi(line);
1064             pwm->state = ASYNC_DONE;
1065         }
1066     }
1067
1068     return rc;
1069 }
1070
1071 gpg_error_t pwmd_pending_line(pwm_t *pwm)
1072 {
1073     if (!pwm)
1074         return GPG_ERR_INV_ARG;
1075
1076     if (!pwm->ctx)
1077         return GPG_ERR_INV_STATE;
1078
1079     return assuan_pending_line(pwm->ctx) ? 0 : GPG_ERR_NO_DATA;
1080 }
1081
1082 pwmd_async_t pwmd_process(pwm_t *pwm, gpg_error_t *rc, char **result)
1083 {
1084     fd_set fds;
1085     int n;
1086     struct timeval tv = {0, 0};
1087
1088     *rc = 0;
1089
1090     if (!pwm) {
1091         *rc = GPG_ERR_INV_ARG;
1092         return ASYNC_DONE;
1093     }
1094
1095     if (pwm->state == ASYNC_DONE)
1096         return pwm->state;
1097
1098     /* When not in a command, this will let libassuan process status messages
1099      * by calling PWMD_OPTION_STATUS_FUNC. The client can poll the file
1100      * descriptor returned by pwmd_get_fd() to determine when this should be
1101      * called or call pwmd_pending_line() to determine whether a buffered line
1102      * needs to be processed. */
1103     if (pwm->cmd == ASYNC_CMD_NONE) {
1104         *rc = assuan_command(pwm, pwm->ctx, NULL, "NOP");
1105         return pwm->state;
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             close(pwm->tcp_conn->fd);
1115             pwm->tcp_conn->fd = -1;
1116             pwm->state = ASYNC_DONE;
1117             return pwm->state;
1118         }
1119
1120         FD_ZERO(&rfds);
1121         FD_ZERO(&wfds);
1122         n = ares_fds(pwm->tcp_conn->chan, &rfds, &wfds);
1123
1124         /* Shouldn't happen. */
1125         if (!n)
1126             return pwm->state;
1127
1128 #ifdef WITH_LIBPTH
1129         n = pth_select(n, &rfds, &wfds, NULL, &tv);
1130 #else
1131         n = select(n, &rfds, &wfds, NULL, &tv);
1132 #endif
1133
1134         if (n > 0)
1135             ares_process(pwm->tcp_conn->chan, &rfds, &wfds);
1136
1137         return pwm->state;
1138     }
1139     else if (pwm->cmd == ASYNC_CMD_CONNECT) {
1140         if (pwm->tcp_conn->rc == GPG_ERR_EINPROGRESS) {
1141             int ret;
1142             socklen_t len = sizeof(int);
1143
1144             FD_ZERO(&fds);
1145             FD_SET(pwm->tcp_conn->fd, &fds);
1146 #ifdef WITH_LIBPTH
1147             n = pth_select(pwm->tcp_conn->fd+1, NULL, &fds, NULL, &tv);
1148 #else
1149             n = select(pwm->tcp_conn->fd+1, NULL, &fds, NULL, &tv);
1150 #endif
1151
1152             if (!n || !FD_ISSET(pwm->tcp_conn->fd, &fds))
1153                 return pwm->state;
1154             else if (n == -1) {
1155                 *rc = gpg_error_from_syserror();
1156                 close(pwm->tcp_conn->fd);
1157                 pwm->tcp_conn->fd = -1;
1158                 pwm->state = ASYNC_DONE;
1159                 return pwm->state;
1160             }
1161
1162             ret = getsockopt(pwm->tcp_conn->fd, SOL_SOCKET, SO_ERROR, &n, &len);
1163
1164             if (ret || n) {
1165                 *rc = ret ? gpg_error_from_syserror() : gpg_error_from_errno(n);
1166                 close(pwm->tcp_conn->fd);
1167                 pwm->tcp_conn->fd = -1;
1168                 pwm->state = ASYNC_DONE;
1169                 return pwm->state;
1170             }
1171         }
1172         else if (pwm->tcp_conn->rc) {
1173             *rc = pwm->tcp_conn->rc;
1174             close(pwm->tcp_conn->fd);
1175             pwm->tcp_conn->fd = -1;
1176             pwm->state = ASYNC_DONE;
1177             return pwm->state;
1178         }
1179
1180         fcntl(pwm->tcp_conn->fd, F_SETFL, 0);
1181         *rc = setup_tcp_session(pwm);
1182
1183         if (!*rc)
1184             *result = pwm->result;
1185
1186         pwm->state = ASYNC_DONE;
1187         return pwm->state;
1188     }
1189 #endif
1190
1191     if (pwm->fd < 0) {
1192         *rc = GPG_ERR_INV_ARG;
1193         return ASYNC_DONE;
1194     }
1195
1196     /* This is for the non-blocking OPEN and SAVE commands. */
1197     FD_ZERO(&fds);
1198     FD_SET(pwm->fd, &fds);
1199 #ifdef WITH_LIBPTH
1200     n = pth_select(pwm->fd+1, &fds, NULL, NULL, &tv);
1201 #else
1202     n = select(pwm->fd+1, &fds, NULL, NULL, &tv);
1203 #endif
1204
1205     if (n > 0) {
1206         if (FD_ISSET(pwm->fd, &fds))
1207             *rc = parse_assuan_line(pwm);
1208     }
1209
1210     while (!*rc && assuan_pending_line(pwm->ctx))
1211         *rc = parse_assuan_line(pwm);
1212
1213     /* For pinentry retries. */
1214     if (pwm->is_open_cmd && gpg_err_code(*rc) == EPWMD_BADKEY &&
1215             ++pwm->ntries < pwm->pinentry_tries) {
1216         pwm->state = ASYNC_INIT;
1217         *rc = pwmd_open_async(pwm, pwm->filename);
1218     }
1219
1220     return pwm->state;
1221 }
1222
1223 static gpg_error_t assuan_command(pwm_t *pwm, assuan_context_t ctx,
1224         char **result, const char *cmd)
1225 {
1226     membuf_t data;
1227     gpg_error_t rc;
1228
1229     data.len = 0;
1230     data.buf = NULL;
1231
1232     rc = assuan_transact(ctx, cmd, mem_realloc_cb, &data, _inquire_cb, pwm,
1233             pwm->status_func, pwm->status_data);
1234
1235     if (rc) {
1236         if (data.buf) {
1237             pwmd_free(data.buf);
1238             data.buf = NULL;
1239         }
1240     }
1241     else {
1242         if (data.buf) {
1243             mem_realloc_cb(&data, "", 1);
1244
1245             if (!result) {
1246                 pwmd_free(data.buf);
1247                 rc = GPG_ERR_INV_ARG;
1248             }
1249             else
1250                 *result = (char *)data.buf;
1251         }
1252     }
1253
1254     return gpg_err_code(rc);
1255 }
1256
1257 gpg_error_t pwmd_inquire(pwm_t *pwm, const char *cmd, pwmd_inquire_fn fn,
1258         void *data)
1259 {
1260     if (!pwm || !cmd || !fn)
1261         return GPG_ERR_INV_ARG;
1262
1263     pwm->inquire_func = fn;
1264     pwm->inquire_data = data;
1265     return assuan_command(pwm, pwm->ctx, NULL, cmd);
1266 }
1267
1268 gpg_error_t pwmd_terminate_pinentry(pwm_t *pwm)
1269 {
1270 #ifndef WITH_PINENTRY
1271     return GPG_ERR_NOT_IMPLEMENTED;
1272 #else
1273     pid_t pid = pwm->pid;
1274
1275     pwm->pid = -1;
1276
1277     if (!pwm || pid == -1)
1278         return GPG_ERR_INV_ARG;
1279
1280     if (kill(pid, 0) == 0) {
1281         if (kill(pid, SIGTERM) == -1) {
1282             if (kill(pid, SIGKILL) == -1)
1283                 return gpg_error_from_errno(errno);
1284         }
1285
1286         pwm->pin_error = GPG_ERR_TIMEOUT;
1287     }
1288     else
1289         return gpg_error_from_errno(errno);
1290
1291     return 0;
1292 #endif
1293 }
1294
1295 #ifdef WITH_PINENTRY
1296 static gpg_error_t set_pinentry_strings(pwm_t *pwm, int which)
1297 {
1298     char *buf;
1299     char tmp[ASSUAN_LINELENGTH];
1300     gpg_error_t error;
1301
1302     if (!pwm->title)
1303         pwm->title = pwmd_strdup(N_("LibPWMD"));
1304
1305     if (!pwm->prompt)
1306         pwm->prompt = pwmd_strdup(N_("Passphrase:"));
1307
1308     if (!pwm->desc && !which)
1309         pwm->desc = pwmd_strdup(N_("Enter a passphrase."));
1310
1311     if (which == 1) {
1312         snprintf(tmp, sizeof(tmp), "SETERROR %s", N_("Invalid passphrase, please try again."));
1313         buf = pwmd_strdup(tmp);
1314     }
1315     else if (which == 2) {
1316         snprintf(tmp, sizeof(tmp), "SETERROR %s", N_("Please type the passphrase again for confirmation."));
1317         buf = pwmd_strdup(tmp);
1318     }
1319     else {
1320         buf = (char *)pwmd_malloc(strlen("SETERROR ") + strlen(pwm->desc) + 1);
1321         sprintf(buf, "SETERROR %s", pwm->desc);
1322     }
1323
1324     error = pinentry_command(pwm, NULL, buf);
1325     pwmd_free(buf);
1326
1327     if (error)
1328         return error;
1329
1330     buf = (char *)pwmd_malloc(strlen("SETPROMPT ") + strlen(pwm->prompt) + 1);
1331     sprintf(buf, "SETPROMPT %s", pwm->prompt);
1332     error = pinentry_command(pwm, NULL, buf);
1333     pwmd_free(buf);
1334
1335     if (error)
1336         return error;
1337
1338     buf = (char *)pwmd_malloc(strlen("SETDESC ") + strlen(pwm->title) + 1);
1339     sprintf(buf, "SETDESC %s", pwm->title);
1340     error = pinentry_command(pwm, NULL, buf);
1341     pwmd_free(buf);
1342     return error;
1343 }
1344
1345 static void update_pinentry_settings(pwm_t *pwm)
1346 {
1347     FILE *fp;
1348     char buf[LINE_MAX];
1349     char *p;
1350     struct passwd pw;
1351     char *pwbuf = _getpwuid(&pw);
1352
1353     if (!pwbuf)
1354         return;
1355
1356     snprintf(buf, sizeof(buf), "%s/.pwmd/pinentry.conf", pw.pw_dir);
1357     pwmd_free(pwbuf);
1358
1359     if ((fp = fopen(buf, "r")) == NULL)
1360         return;
1361
1362     while ((p = fgets(buf, sizeof(buf), fp)) != NULL) {
1363         char name[32], val[256];
1364
1365         if (sscanf(p, " %31[a-zA-Z] = %255s", name, val) != 2)
1366             continue;
1367
1368         if (strcasecmp(name, "TTYNAME") == 0) {
1369             pwmd_free(pwm->pinentry_tty);
1370             pwm->pinentry_tty = pwmd_strdup(val);
1371         }
1372         else if (strcasecmp(name, "TTYTYPE") == 0) {
1373             pwmd_free(pwm->pinentry_term);
1374             pwm->pinentry_term = pwmd_strdup(val);
1375         }
1376         else if (strcasecmp(name, "DISPLAY") == 0) {
1377             pwmd_free(pwm->pinentry_display);
1378             pwm->pinentry_display = pwmd_strdup(val);
1379         }
1380         else if (strcasecmp(name, "PATH") == 0) {
1381             pwmd_free(pwm->pinentry_path);
1382             pwm->pinentry_path = pwmd_strdup(val);
1383         }
1384     }
1385
1386     fclose(fp);
1387 }
1388
1389 static gpg_error_t launch_pinentry(pwm_t *pwm)
1390 {
1391     int rc;
1392     assuan_context_t ctx;
1393     int child_list[] = {-1};
1394     char *display = getenv("DISPLAY");
1395     const char *argv[10];
1396     const char **p = argv;
1397     int have_display = 0;
1398     char *tty = NULL;
1399     char *ttybuf = NULL;
1400
1401     update_pinentry_settings(pwm);
1402
1403     if (pwm->pinentry_display || display)
1404         have_display = 1;
1405     else {
1406         if (!pwm->pinentry_tty) {
1407             ttybuf = pwmd_malloc(255);
1408
1409             if (!ttybuf)
1410                 return gpg_error_from_errno(ENOMEM);
1411
1412             rc = ttyname_r(STDOUT_FILENO, ttybuf, 255);
1413
1414             if (rc) {
1415                 pwmd_free(ttybuf);
1416                 return gpg_error_from_errno(rc);
1417             }
1418
1419             tty = ttybuf;
1420         }
1421         else
1422             tty = pwm->pinentry_tty;
1423     }
1424
1425     if (!have_display && !tty)
1426         return GPG_ERR_ENOTTY;
1427
1428     *p++ = "pinentry";
1429     *p++ = have_display ? "--display" : "--ttyname";
1430     *p++ = have_display ? pwm->pinentry_display ? pwm->pinentry_display : display : tty;
1431
1432     if (pwm->lcctype) {
1433         *p++ = "--lc-ctype";
1434         *p++ = pwm->lcctype;
1435     }
1436
1437     if (pwm->lcmessages) {
1438         *p++ = "--lc-messages";
1439         *p++ = pwm->lcmessages;
1440     }
1441
1442     *p = NULL;
1443
1444     if (!have_display) {
1445         *p++ = "--ttytype";
1446         *p++ = pwm->pinentry_term ? pwm->pinentry_term : getenv("TERM");
1447         *p = NULL;
1448     }
1449
1450     rc = assuan_pipe_connect(&ctx, pwm->pinentry_path ? pwm->pinentry_path : PINENTRY_PATH, argv, child_list);
1451
1452     if (ttybuf)
1453         pwmd_free(ttybuf);
1454
1455     if (rc)
1456         return rc;
1457
1458     pwm->pid = assuan_get_pid(ctx);
1459     pwm->pctx = ctx;
1460     return set_pinentry_strings(pwm, 0);
1461 }
1462
1463 static gpg_error_t pinentry_command(pwm_t *pwm, char **result, const char *cmd)
1464 {
1465     gpg_error_t n;
1466
1467     if (!pwm->pctx) {
1468         n = launch_pinentry(pwm);
1469
1470         if (n)
1471             return n;
1472     }
1473
1474     return assuan_command(pwm, pwm->pctx, result, cmd);
1475 }
1476
1477 static void pinentry_disconnect(pwm_t *pwm)
1478 {
1479     if (pwm->pctx)
1480         assuan_disconnect(pwm->pctx);
1481
1482     pwm->pctx = NULL;
1483     pwm->pid = -1;
1484 }
1485
1486 /*
1487  * Only called from a child process.
1488  */
1489 static void catchsig(int sig)
1490 {
1491     switch (sig) {
1492         case SIGALRM:
1493             if (gelapsed++ >= gtimeout) {
1494                 global_error = pwmd_terminate_pinentry(gpwm);
1495
1496                 if (!global_error)
1497                     global_error = GPG_ERR_TIMEOUT;
1498
1499                 break;
1500             }
1501
1502             alarm(1);
1503             break;
1504         default:
1505             break;
1506     }
1507 }
1508 #endif
1509
1510 /*
1511  * Borrowed from libassuan.
1512  */
1513 static char *percent_escape(const char *atext)
1514 {
1515     const unsigned char *s;
1516     int len = strlen(atext) * 3 + 1;
1517     char *buf = (char *)pwmd_malloc(len), *p = buf;
1518
1519     if (!buf)
1520         return NULL;
1521
1522     for (s=(const unsigned char *)atext; *s; s++) {
1523         if (*s < ' ') {
1524             sprintf (p, "%%%02X", *s);
1525             p += 3;
1526         }
1527         else
1528             *p++ = *s;
1529     }
1530
1531     *p = 0;
1532     return buf;
1533 }
1534
1535 static gpg_error_t send_command(pwm_t *pwm, char **result, const char *cmd)
1536 {
1537     if (!cmd)
1538         return GPG_ERR_INV_ARG;
1539
1540     return assuan_command(pwm, pwm->ctx, result, cmd);
1541 }
1542
1543 gpg_error_t pwmd_command_ap(pwm_t *pwm, char **result, const char *cmd,
1544         va_list ap)
1545 {
1546     char *buf;
1547     size_t len;
1548     gpg_error_t error;
1549
1550     if (!pwm || !cmd)
1551         return GPG_ERR_INV_ARG;
1552
1553     /*
1554      * C99 allows the dst pointer to be null which will calculate the length
1555      * of the would-be result and return it.
1556      */
1557     len = vsnprintf(NULL, 0, cmd, ap)+1;
1558     buf = (char *)pwmd_malloc(len);
1559     len = vsnprintf(buf, len, cmd, ap);
1560     error = send_command(pwm, result, buf);
1561     pwmd_free(buf);
1562     return error;
1563 }
1564
1565 /*
1566  * Avoid sending the BYE command here. libassuan will close the file
1567  * descriptor and release the assuan context. Use pwmd_close() instead.
1568  */
1569 gpg_error_t pwmd_command(pwm_t *pwm, char **result, const char *cmd, ...)
1570 {
1571     va_list ap;
1572     gpg_error_t error;
1573
1574     if (!pwm || !cmd)
1575         return GPG_ERR_INV_ARG;
1576
1577     if (result)
1578         *result = NULL;
1579
1580     va_start(ap, cmd);
1581     error = pwmd_command_ap(pwm, result, cmd, ap);
1582     va_end(ap);
1583     return error;
1584 }
1585
1586 #ifdef WITH_PINENTRY
1587 static gpg_error_t do_getpin(pwm_t *pwm, char **result)
1588 {
1589     if (gtimeout) {
1590         signal(SIGALRM, catchsig);
1591         alarm(1);
1592     }
1593
1594     *result = NULL;
1595     return pinentry_command(pwm, result, "GETPIN");
1596 }
1597
1598 static gpg_error_t getpin(pwm_t *pwm, char **result, int *try_n, int which)
1599 {
1600     int pin_try = *try_n;
1601     gpg_error_t error;
1602
1603 getpin_again:
1604     *try_n = pin_try;
1605
1606     if (pin_try == -1) {
1607         error = set_pinentry_strings(pwm, which);
1608
1609         if (error) {
1610             pinentry_disconnect(pwm);
1611             return error;
1612         }
1613     }
1614     else {
1615         if (pwm->pinentry_tries-1 != pin_try) {
1616             error = set_pinentry_strings(pwm, 1);
1617
1618             if (error) {
1619                 pinentry_disconnect(pwm);
1620                 return error;
1621             }
1622         }
1623     }
1624
1625     error = do_getpin(pwm, result);
1626
1627     /*
1628      * Since there was input cancel any timeout setting.
1629      */
1630     alarm(0);
1631
1632     if (error) {
1633         if (error == GPG_ERR_CANCELED)
1634             return GPG_ERR_CANCELED;
1635
1636         if (pin_try != -1 && pin_try--)
1637             goto getpin_again;
1638
1639         if (pwm->pctx)
1640             pinentry_disconnect(pwm);
1641
1642         *try_n = pin_try;
1643         return error;
1644     }
1645
1646     return 0;
1647 }
1648 #endif
1649
1650 gpg_error_t pwmd_open_nb_finalize(pwm_t *pwm, pwmd_nb_status_t *pw)
1651 {
1652     gpg_error_t error;
1653
1654 #ifndef WITH_PINENTRY
1655     return GPG_ERR_NOT_IMPLEMENTED;
1656 #endif
1657
1658     if (!pwm || !pw || !pw->filename[0])
1659         return GPG_ERR_INV_ARG;
1660
1661     close(pw->fd);
1662
1663     if (pw->error) {
1664         error = pw->error;
1665         goto fail;
1666     }
1667
1668     if (pwm->filename)
1669         pwmd_free(pwm->filename);
1670
1671     pwm->filename = pwmd_strdup(pw->filename);
1672     memset(pw, 0, sizeof(pwmd_nb_status_t));
1673     return 0;
1674
1675 fail:
1676     memset(pw, 0, sizeof(pwmd_nb_status_t));
1677     return error;
1678 }
1679
1680 static gpg_error_t do_open_command(pwm_t *pwm, const char *filename, char *password)
1681 {
1682     char buf[ASSUAN_LINELENGTH];
1683     gpg_error_t error;
1684     char *result = NULL;
1685
1686     snprintf(buf, sizeof(buf), "OPEN %s %s", filename, password ? password : "");
1687     error = send_command(pwm, &result, buf);
1688     memset(buf, 0, sizeof(buf));
1689
1690     if (error && result)
1691         pwmd_free(result);
1692
1693     return error;
1694 }
1695
1696 static int do_pwmd_open(pwm_t *pwm, gpg_error_t *error, const char *filename,
1697         int nb)
1698 {
1699     char *result = NULL;
1700     char *password = NULL;
1701     char path[PATH_MAX];
1702 #ifdef WITH_PINENTRY
1703     int pin_try;
1704 #endif
1705
1706     if (!pwm || !filename || !*filename) {
1707         *error = GPG_ERR_INV_ARG;
1708         return nb ? -1 : 1;
1709     }
1710
1711 #ifdef WITH_PINENTRY
1712     pin_try = pwm->pinentry_tries - 1;
1713 #endif
1714
1715     /*
1716      * Avoid calling pinentry if the password is cached on the server or if
1717      * this is a new file.
1718      */
1719     *error = pwmd_command(pwm, &result, "GETCONFIG data_directory");
1720
1721     if (*error)
1722         return nb ? -1 : 1;
1723
1724     snprintf(path, sizeof(path), "%s/%s", result, filename);
1725     pwmd_free(result);
1726
1727     if (access(path, R_OK) == -1) {
1728         if (errno == ENOENT)
1729             goto gotpassword;
1730     }
1731
1732     *error = pwmd_command(pwm, &result, "ISCACHED %s", filename);
1733
1734     if (*error == EPWMD_CACHE_NOT_FOUND) {
1735         if (pwm->passfunc) {
1736             password = (char *)pwm->passfunc(pwm->passdata);
1737             goto gotpassword;
1738         }
1739
1740 #ifdef WITH_PINENTRY
1741         /*
1742          * Get the password from pinentry.
1743          */
1744         if (pwm->use_pinentry) {
1745             /*
1746              * Nonblocking is wanted. fork() then return a file descriptor
1747              * that the client can use to read() from.
1748              */
1749             if (nb) {
1750                 int p[2];
1751                 pid_t pid;
1752                 pwmd_nb_status_t pw;
1753
1754                 if (pipe(p) == -1) {
1755                     *error = gpg_error_from_syserror();
1756                     return -1;
1757                 }
1758
1759 #ifdef WITH_LIBPTH
1760                 pid = pth_fork();
1761 #else
1762                 pid = fork();
1763 #endif
1764
1765                 switch (pid) {
1766                     case 0:
1767                         close(p[0]);
1768                         strncpy(pw.filename, filename, sizeof(pw.filename));
1769                         pw.filename[sizeof(pw.filename)-1] = 0;
1770                         pw.fd = p[0];
1771
1772                         if (pwm->pinentry_timeout > 0) {
1773                             gpwm = pwm;
1774                             gtimeout = pwm->pinentry_timeout;
1775                             gelapsed = 0;
1776                         }
1777
1778 getpin_nb_again:
1779                         *error = getpin(pwm, &password, &pin_try, 0);
1780
1781                         if (*error) {
1782 getpin_nb_fail:
1783                             if (pwm->pctx)
1784                                 pinentry_disconnect(pwm);
1785
1786                             if (gtimeout && gelapsed >= gtimeout)
1787                                 *error = GPG_ERR_TIMEOUT;
1788
1789                             pw.error = *error;
1790 #ifdef WITH_LIBPTH
1791                             pth_write(p[1], &pw, sizeof(pw));
1792 #else
1793                             write(p[1], &pw, sizeof(pw));
1794 #endif
1795                             close(p[1]);
1796                             _exit(1);
1797                         }
1798
1799                         /*
1800                          * Don't count the time it takes to open the file
1801                          * which may have many iterations.
1802                          */
1803                         signal(SIGALRM, SIG_DFL);
1804                         *error = do_open_command(pwm, filename, password);
1805
1806                         if (pwm->pinentry_timeout)
1807                             signal(SIGALRM, catchsig);
1808
1809                         if (pwm->pctx && *error == EPWMD_BADKEY) {
1810                             if (pin_try-- > 0)
1811                                 goto getpin_nb_again;
1812
1813                             goto getpin_nb_fail;
1814                         }
1815
1816                         pinentry_disconnect(pwm);
1817                         pw.error = 0;
1818 #ifdef WITH_LIBPTH
1819                         pth_write(p[1], &pw, sizeof(pw));
1820 #else
1821                         write(p[1], &pw, sizeof(pw));
1822 #endif
1823                         close(p[1]);
1824                         _exit(0);
1825                         break;
1826                     case -1:
1827                         *error = gpg_error_from_syserror();
1828                         close(p[0]);
1829                         close(p[1]);
1830                         return -1;
1831                     default:
1832                         break;
1833                 }
1834
1835                 close(p[1]);
1836                 *error = 0;
1837                 return p[0];
1838             }
1839         }
1840         else {
1841 #endif
1842             /*
1843              * Not using pinentry and the file was not found
1844              * in the cache.
1845              */
1846             password = pwm->password;
1847 #ifdef WITH_PINENTRY
1848         }
1849 #endif
1850     }
1851     else if (*error)
1852         return nb ? -1 : 1;
1853
1854 gotpassword:
1855     *error = do_open_command(pwm, filename, password);
1856
1857     /*
1858      * Keep the user defined password set with pwmd_setopt(). The password may
1859      * be needed later (pwmd_save()) depending on the pwmd file cache settings.
1860      */
1861     if (!pwm->passfunc && password && password != pwm->password)
1862         pwmd_free(password);
1863
1864 #ifdef WITH_PINENTRY
1865     if (*error == EPWMD_BADKEY) {
1866         if (pin_try-- > 0 && !nb) {
1867             *error = pwmd_command(pwm, &result, "OPTION TITLE=%s",
1868                     N_("Invalid passphrase, please try again."));
1869
1870             if (*error)
1871                 return 1;
1872
1873             goto gotpassword;
1874         }
1875
1876         if (nb)
1877             pinentry_disconnect(pwm);
1878
1879         return nb ? -1 : 1;
1880     }
1881 #endif
1882
1883     if (!*error) {
1884         if (pwm->filename)
1885             pwmd_free(pwm->filename);
1886
1887         pwm->filename = pwmd_strdup(filename);
1888     }
1889
1890     /*
1891      * The file is cached or the file is a new file.
1892      */
1893     if (nb)
1894         return *error ? -1 : -2;
1895
1896     return *error ? 1 : 0;
1897 }
1898
1899 gpg_error_t pwmd_open(pwm_t *pwm, const char *filename)
1900 {
1901     gpg_error_t error;
1902
1903     do_pwmd_open(pwm, &error, filename, 0);
1904     return error;
1905 }
1906
1907 int pwmd_open_nb(pwm_t *pwm, gpg_error_t *error, const char *filename)
1908 {
1909 #ifndef WITH_PINENTRY
1910     *error = GPG_ERR_NOT_IMPLEMENTED;
1911     return -1;
1912 #else
1913     return do_pwmd_open(pwm, error, filename, 1);
1914 #endif
1915 }
1916
1917 #ifdef WITH_PINENTRY
1918 static gpg_error_t do_save_getpin(pwm_t *pwm, char **password)
1919 {
1920     int confirm = 0;
1921     gpg_error_t error;
1922     char *result = NULL;
1923     int pin_try = -1;
1924
1925 again:
1926     error = getpin(pwm, &result, &pin_try, confirm ? 2 : 0);
1927
1928     if (error) {
1929         if (pwm->pctx)
1930             pinentry_disconnect(pwm);
1931
1932         if (*password)
1933             pwmd_free(*password);
1934
1935         return error;
1936     }
1937
1938     if (!confirm++) {
1939         *password = result;
1940         goto again;
1941     }
1942
1943     if (strcmp(*password, result)) {
1944         pwmd_free(*password);
1945         pwmd_free(result);
1946         pinentry_disconnect(pwm);
1947         error = EPWMD_BADKEY;
1948         return error;
1949     }
1950
1951     pwmd_free(result);
1952     pinentry_disconnect(pwm);
1953     return 0;
1954 }
1955 #endif
1956
1957 static gpg_error_t do_save_command(pwm_t *pwm, char *password)
1958 {
1959     char buf[ASSUAN_LINELENGTH];
1960     gpg_error_t error;
1961     char *result = NULL;
1962
1963     snprintf(buf, sizeof(buf), "SAVE %s", password ? password : "");
1964     error = send_command(pwm, &result, buf);
1965     memset(&buf, 0, sizeof(buf));
1966
1967     if (error && result)
1968         pwmd_free(result);
1969
1970     return error;
1971 }
1972
1973 gpg_error_t pwmd_save_nb_finalize(pwm_t *pwm, pwmd_nb_status_t *pw)
1974 {
1975     gpg_error_t rc;
1976
1977 #ifndef WITH_PINENTRY
1978     return GPG_ERR_NOT_IMPLEMENTED;
1979 #endif
1980
1981     if (!pwm || !pw || !pw->filename[0])
1982         return GPG_ERR_INV_ARG;
1983
1984     close(pw->fd);
1985     rc = pw->error;
1986     memset(pw, 0, sizeof(pwmd_nb_status_t));
1987     return rc;
1988 }
1989
1990 static int do_pwmd_save(pwm_t *pwm, gpg_error_t *error, int nb)
1991 {
1992     char *result = NULL;
1993     char *password = NULL;
1994
1995     if (!pwm) {
1996         *error = GPG_ERR_INV_ARG;
1997         return nb ? -1 : 1;
1998     }
1999
2000     if (pwm->use_pinentry || pwm->passfunc) {
2001         *error = pwmd_command(pwm, &result, "ISCACHED %s", pwm->filename);
2002
2003         if (*error == EPWMD_CACHE_NOT_FOUND) {
2004             if (pwm->passfunc)
2005                 password = (char *)(*pwm->passfunc)(pwm->passdata);
2006 #ifdef WITH_PINENTRY
2007             else if (pwm->use_pinentry) {
2008                 if (nb) {
2009                     int p[2];
2010                     pid_t pid;
2011                     pwmd_nb_status_t pw;
2012
2013                     if (pipe(p) == -1) {
2014                         *error = gpg_error_from_syserror();
2015                         return -1;
2016                     }
2017
2018 #ifdef WITH_LIBPTH
2019                     pid = pth_fork();
2020 #else
2021                     pid = fork();
2022 #endif
2023
2024                     switch (pid) {
2025                         case 0:
2026                             close(p[0]);
2027                             strncpy(pw.filename, pwm->filename, sizeof(pw.filename));
2028                             pw.filename[sizeof(pw.filename)-1] = 0;
2029                             pw.fd = p[0];
2030
2031                             do {
2032                                 password = NULL;
2033                                 *error = do_save_getpin(pwm, &password);
2034                             } while (*error == EPWMD_BADKEY);
2035
2036                             if (*error) {
2037                                 if (pwm->pctx)
2038                                     pinentry_disconnect(pwm);
2039
2040                                 pw.error = *error;
2041 #ifdef WITH_LIBPTH
2042                                 pth_write(p[1], &pw, sizeof(pw));
2043 #else
2044                                 write(p[1], &pw, sizeof(pw));
2045 #endif
2046                                 close(p[1]);
2047                                 _exit(1);
2048                             }
2049
2050                             *error = do_save_command(pwm, password);
2051                             pinentry_disconnect(pwm);
2052                             pw.error = *error;
2053 #ifdef WITH_LIBPTH
2054                             pth_write(p[1], &pw, sizeof(pw));
2055 #else
2056                             write(p[1], &pw, sizeof(pw));
2057 #endif
2058                             close(p[1]);
2059                             _exit(0);
2060                             break;
2061                         case -1:
2062                             *error = gpg_error_from_syserror();
2063                             close(p[0]);
2064                             close(p[1]);
2065                             return -1;
2066                         default:
2067                             break;
2068                     }
2069
2070                     close(p[1]);
2071                     *error = 0;
2072                     return p[0];
2073                 }
2074
2075                 *error = do_save_getpin(pwm, &password);
2076
2077                 if (*error)
2078                     return 1;
2079             }
2080 #endif
2081         }
2082         else {
2083             if (*error)
2084                 return nb ? -1 : 1;
2085         }
2086     }
2087     else
2088         password = pwm->password;
2089
2090     *error = do_save_command(pwm, password);
2091
2092     if (!pwm->passfunc && password && password != pwm->password)
2093         pwmd_free(password);
2094
2095     if (nb)
2096         return *error ? -1 : -2;
2097
2098     return *error ? 1 : 0;
2099 }
2100
2101 int pwmd_save_nb(pwm_t *pwm, gpg_error_t *error)
2102 {
2103 #ifndef WITH_PINENTRY
2104     *error = GPG_ERR_NOT_IMPLEMENTED;
2105     return -1;
2106 #else
2107     return do_pwmd_save(pwm, error, 1);
2108 #endif
2109 }
2110
2111 gpg_error_t pwmd_save(pwm_t *pwm)
2112 {
2113     gpg_error_t error;
2114
2115     do_pwmd_save(pwm, &error, 0);
2116     return error;
2117 }
2118
2119 gpg_error_t pwmd_setopt(pwm_t *pwm, pwmd_option_t opt, ...)
2120 {
2121     va_list ap;
2122     int n = va_arg(ap, int);
2123     char *result;
2124     char *arg1;
2125     gpg_error_t error = 0;
2126
2127     if (!pwm)
2128         return GPG_ERR_INV_ARG;
2129
2130     va_start(ap, opt);
2131
2132     switch (opt) {
2133         case PWMD_OPTION_STATUS_FUNC:
2134             pwm->status_func = va_arg(ap, pwmd_status_fn);
2135             break;
2136         case PWMD_OPTION_STATUS_DATA:
2137             pwm->status_data = va_arg(ap, void *);
2138             break;
2139         case PWMD_OPTION_PASSWORD_FUNC:
2140             pwm->passfunc = va_arg(ap, pwmd_password_fn);
2141             break;
2142         case PWMD_OPTION_PASSWORD_DATA:
2143             pwm->passdata = va_arg(ap, void *);
2144             break;
2145         case PWMD_OPTION_PASSWORD:
2146             arg1 = va_arg(ap, char *);
2147
2148             if (pwm->password)
2149                 pwmd_free(pwm->password);
2150
2151             pwm->password = pwmd_strdup(arg1);
2152             break;
2153         case PWMD_OPTION_PINENTRY:
2154             n = va_arg(ap, int);
2155
2156             if (n != 0 && n != 1) {
2157                 va_end(ap);
2158                 error = GPG_ERR_INV_VALUE;
2159             }
2160             else {
2161                 pwm->use_pinentry = n;
2162                 error = pwmd_command(pwm, &result, "OPTION PINENTRY=%i",
2163                         !pwm->use_pinentry);
2164             }
2165             break;
2166 #ifdef WITH_PINENTRY
2167         case PWMD_OPTION_PINENTRY_TRIES:
2168             n = va_arg(ap, int);
2169
2170             if (n <= 0) {
2171                 va_end(ap);
2172                 error = GPG_ERR_INV_VALUE;
2173             }
2174             else
2175                 pwm->pinentry_tries = n;
2176             break;
2177 #endif
2178         case PWMD_OPTION_PINENTRY_TIMEOUT:
2179             n = va_arg(ap, int);
2180
2181             if (n < 0) {
2182                 va_end(ap);
2183                 error = GPG_ERR_INV_VALUE;
2184             }
2185             else
2186                 pwm->pinentry_timeout = n;
2187
2188             if (!pwm->use_pinentry)
2189                 error = pwmd_command(pwm, &result, "OPTION TIMEOUT=%i",
2190                         pwm->pinentry_timeout);
2191             break;
2192         case PWMD_OPTION_PINENTRY_PATH:
2193             if (pwm->pinentry_path)
2194                 pwmd_free(pwm->pinentry_path);
2195
2196             pwm->pinentry_path = pwmd_strdup(va_arg(ap, char *));
2197
2198             if (!pwm->use_pinentry)
2199                 error = pwmd_command(pwm, &result, "OPTION PATH=%s",
2200                         pwm->pinentry_path);
2201             break;
2202         case PWMD_OPTION_PINENTRY_TTY:
2203             if (pwm->pinentry_tty)
2204                 pwmd_free(pwm->pinentry_tty);
2205
2206             pwm->pinentry_tty = pwmd_strdup(va_arg(ap, char *));
2207
2208             if (!pwm->use_pinentry)
2209                 error = pwmd_command(pwm, &result, "OPTION TTY=%s",
2210                         pwm->pinentry_tty);
2211             break;
2212         case PWMD_OPTION_PINENTRY_DISPLAY:
2213             if (pwm->pinentry_display)
2214                 pwmd_free(pwm->pinentry_display);
2215
2216             pwm->pinentry_display = pwmd_strdup(va_arg(ap, char *));
2217
2218             if (!pwm->use_pinentry)
2219                 error = pwmd_command(pwm, &result, "OPTION DISPLAY=%s",
2220                         pwm->pinentry_display);
2221             break;
2222         case PWMD_OPTION_PINENTRY_TERM:
2223             if (pwm->pinentry_term)
2224                 pwmd_free(pwm->pinentry_term);
2225
2226             pwm->pinentry_term = pwmd_strdup(va_arg(ap, char *));
2227
2228             if (!pwm->use_pinentry)
2229                 error = pwmd_command(pwm, &result, "OPTION TTYTYPE=%s",
2230                         pwm->pinentry_term);
2231             break;
2232         case PWMD_OPTION_PINENTRY_TITLE:
2233             if (pwm->title)
2234                 pwmd_free(pwm->title);
2235
2236             pwm->title = percent_escape(va_arg(ap, char *));
2237
2238             if (!pwm->use_pinentry)
2239                 error = pwmd_command(pwm, &result, "OPTION TITLE=%s",
2240                         pwm->title);
2241             break;
2242         case PWMD_OPTION_PINENTRY_PROMPT:
2243             if (pwm->prompt)
2244                 pwmd_free(pwm->prompt);
2245
2246             pwm->prompt = percent_escape(va_arg(ap, char *));
2247
2248             if (!pwm->use_pinentry)
2249                 error = pwmd_command(pwm, &result, "OPTION PROMPT=%s",
2250                         pwm->prompt);
2251             break;
2252         case PWMD_OPTION_PINENTRY_DESC:
2253             if (pwm->desc)
2254                 pwmd_free(pwm->desc);
2255
2256             pwm->desc = percent_escape(va_arg(ap, char *));
2257
2258             if (!pwm->use_pinentry)
2259                 error = pwmd_command(pwm, &result, "OPTION DESC=%s",
2260                         pwm->desc);
2261             break;
2262         case PWMD_OPTION_PINENTRY_LC_CTYPE:
2263             if (pwm->lcctype)
2264                 pwmd_free(pwm->lcctype);
2265
2266             pwm->lcctype = pwmd_strdup(va_arg(ap, char *));
2267
2268             if (!pwm->use_pinentry)
2269                 error = pwmd_command(pwm, &result, "OPTION LC_CTYPE=%s",
2270                         pwm->lcctype);
2271             break;
2272         case PWMD_OPTION_PINENTRY_LC_MESSAGES:
2273             if (pwm->lcmessages)
2274                 pwmd_free(pwm->lcmessages);
2275
2276             pwm->lcmessages = pwmd_strdup(va_arg(ap, char *));
2277
2278             if (!pwm->use_pinentry)
2279                 error = pwmd_command(pwm, &result, "OPTION LC_MESSAGES=%s",
2280                         pwm->lcmessages);
2281             break;
2282         default:
2283             error = GPG_ERR_NOT_IMPLEMENTED;
2284             break;
2285     }
2286
2287     va_end(ap);
2288     return error;
2289 }
2290
2291 gpg_error_t pwmd_get_fd(pwm_t *pwm, int *fd)
2292 {
2293     if (!pwm)
2294         return GPG_ERR_INV_ARG;
2295
2296     if (pwm->fd == -1)
2297         return GPG_ERR_INV_STATE;
2298
2299     *fd = pwm->fd;
2300     return 0;
2301 }
2302
2303 pwm_t *pwmd_new(const char *name)
2304 {
2305     pwm_t *h = pwmd_calloc(1, sizeof(pwm_t));
2306
2307     if (!h)
2308         return NULL;
2309
2310     if (name) {
2311         h->name = pwmd_strdup(name);
2312
2313         if (!h->name) {
2314             pwmd_free(h);
2315             return NULL;
2316         }
2317     }
2318
2319     return h;
2320 }
2321
2322 void pwmd_free(void *ptr)
2323 {
2324     xfree(ptr);
2325 }
2326
2327 void *pwmd_malloc(size_t size)
2328 {
2329     return xmalloc(size);
2330 }
2331
2332 void *pwmd_calloc(size_t nmemb, size_t size)
2333 {
2334     return xcalloc(nmemb, size);
2335 }
2336
2337 void *pwmd_realloc(void *ptr, size_t size)
2338 {
2339     return xrealloc(ptr, size);
2340 }
2341
2342 char *pwmd_strdup(const char *str)
2343 {
2344     return xstrdup(str);
2345 }