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, sizeof(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 pwmd_async_t pwmd_process(pwm_t *pwm, gpg_error_t *rc, const char **result)
1072 {
1073     fd_set fds;
1074     int n;
1075     struct timeval tv = {0, 0};
1076
1077     *rc = 0;
1078
1079     if (!pwm) {
1080         *rc = GPG_ERR_INV_ARG;
1081         return ASYNC_DONE;
1082     }
1083
1084     if (pwm->state == ASYNC_DONE)
1085         return pwm->state;
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. */
1091     if (pwm->cmd == ASYNC_CMD_NONE) {
1092         *rc = assuan_command(pwm, pwm->ctx, NULL, "NOP");
1093         return pwm->state;
1094     }
1095
1096 #ifdef WITH_TCP
1097     if (pwm->cmd == ASYNC_CMD_DNS) {
1098         fd_set rfds, wfds;
1099
1100         if (pwm->tcp_conn->rc) {
1101             *rc = pwm->tcp_conn->rc;
1102             close(pwm->tcp_conn->fd);
1103             pwm->tcp_conn->fd = -1;
1104             pwm->state = ASYNC_DONE;
1105             return pwm->state;
1106         }
1107
1108         FD_ZERO(&rfds);
1109         FD_ZERO(&wfds);
1110         n = ares_fds(pwm->tcp_conn->chan, &rfds, &wfds);
1111
1112         /* Shouldn't happen. */
1113         if (!n)
1114             return pwm->state;
1115
1116 #ifdef WITH_LIBPTH
1117         n = pth_select(n, &rfds, &wfds, NULL, &tv);
1118 #else
1119         n = select(n, &rfds, &wfds, NULL, &tv);
1120 #endif
1121
1122         if (n > 0)
1123             ares_process(pwm->tcp_conn->chan, &rfds, &wfds);
1124
1125         return pwm->state;
1126     }
1127     else if (pwm->cmd == ASYNC_CMD_CONNECT) {
1128         if (pwm->tcp_conn->rc == GPG_ERR_EINPROGRESS) {
1129             int ret;
1130             socklen_t len = sizeof(int);
1131
1132             FD_ZERO(&fds);
1133             FD_SET(pwm->tcp_conn->fd, &fds);
1134 #ifdef WITH_LIBPTH
1135             n = pth_select(pwm->tcp_conn->fd+1, NULL, &fds, NULL, &tv);
1136 #else
1137             n = select(pwm->tcp_conn->fd+1, NULL, &fds, NULL, &tv);
1138 #endif
1139
1140             if (!n || !FD_ISSET(pwm->tcp_conn->fd, &fds))
1141                 return pwm->state;
1142             else if (n == -1) {
1143                 *rc = gpg_error_from_syserror();
1144                 close(pwm->tcp_conn->fd);
1145                 pwm->tcp_conn->fd = -1;
1146                 pwm->state = ASYNC_DONE;
1147                 return pwm->state;
1148             }
1149
1150             ret = getsockopt(pwm->tcp_conn->fd, SOL_SOCKET, SO_ERROR, &n, &len);
1151
1152             if (ret || n) {
1153                 *rc = ret ? gpg_error_from_syserror() : gpg_error_from_errno(n);
1154                 close(pwm->tcp_conn->fd);
1155                 pwm->tcp_conn->fd = -1;
1156                 pwm->state = ASYNC_DONE;
1157                 return pwm->state;
1158             }
1159         }
1160         else if (pwm->tcp_conn->rc) {
1161             *rc = pwm->tcp_conn->rc;
1162             close(pwm->tcp_conn->fd);
1163             pwm->tcp_conn->fd = -1;
1164             pwm->state = ASYNC_DONE;
1165             return pwm->state;
1166         }
1167
1168         fcntl(pwm->tcp_conn->fd, F_SETFL, 0);
1169         *rc = setup_tcp_session(pwm);
1170         pwm->state = ASYNC_DONE;
1171         return pwm->state;
1172     }
1173 #endif
1174
1175     if (pwm->fd < 0) {
1176         *rc = GPG_ERR_INV_ARG;
1177         return ASYNC_DONE;
1178     }
1179
1180     /* This is for the non-blocking OPEN and SAVE commands. */
1181     FD_ZERO(&fds);
1182     FD_SET(pwm->fd, &fds);
1183 #ifdef WITH_LIBPTH
1184     n = pth_select(pwm->fd+1, &fds, NULL, NULL, &tv);
1185 #else
1186     n = select(pwm->fd+1, &fds, NULL, NULL, &tv);
1187 #endif
1188
1189     if (n > 0) {
1190         if (FD_ISSET(pwm->fd, &fds))
1191             *rc = parse_assuan_line(pwm);
1192     }
1193
1194     while (!*rc && assuan_pending_line(pwm->ctx))
1195         *rc = parse_assuan_line(pwm);
1196
1197     /* For pinentry retries. */
1198     if (pwm->is_open_cmd && gpg_err_code(*rc) == EPWMD_BADKEY &&
1199             ++pwm->ntries < pwm->pinentry_tries) {
1200         pwm->state = ASYNC_INIT;
1201         *rc = pwmd_open_async(pwm, pwm->filename);
1202     }
1203
1204     return pwm->state;
1205 }
1206
1207 static gpg_error_t assuan_command(pwm_t *pwm, assuan_context_t ctx,
1208         char **result, const char *cmd)
1209 {
1210     membuf_t data;
1211     gpg_error_t rc;
1212
1213     data.len = 0;
1214     data.buf = NULL;
1215
1216     rc = assuan_transact(ctx, cmd, mem_realloc_cb, &data, _inquire_cb, pwm,
1217             pwm->status_func, pwm->status_data);
1218
1219     if (rc) {
1220         if (data.buf) {
1221             pwmd_free(data.buf);
1222             data.buf = NULL;
1223         }
1224     }
1225     else {
1226         if (data.buf) {
1227             mem_realloc_cb(&data, "", 1);
1228
1229             if (!result) {
1230                 pwmd_free(data.buf);
1231                 rc = GPG_ERR_INV_ARG;
1232             }
1233             else
1234                 *result = (char *)data.buf;
1235         }
1236     }
1237
1238     return gpg_err_code(rc);
1239 }
1240
1241 gpg_error_t pwmd_inquire(pwm_t *pwm, const char *cmd, pwmd_inquire_fn fn,
1242         void *data)
1243 {
1244     if (!pwm || !cmd || !fn)
1245         return GPG_ERR_INV_ARG;
1246
1247     pwm->inquire_func = fn;
1248     pwm->inquire_data = data;
1249     return assuan_command(pwm, pwm->ctx, NULL, cmd);
1250 }
1251
1252 gpg_error_t pwmd_terminate_pinentry(pwm_t *pwm)
1253 {
1254 #ifndef WITH_PINENTRY
1255     return GPG_ERR_NOT_IMPLEMENTED;
1256 #else
1257     pid_t pid = pwm->pid;
1258
1259     pwm->pid = -1;
1260
1261     if (!pwm || pid == -1)
1262         return GPG_ERR_INV_ARG;
1263
1264     if (kill(pid, 0) == 0) {
1265         if (kill(pid, SIGTERM) == -1) {
1266             if (kill(pid, SIGKILL) == -1)
1267                 return gpg_error_from_errno(errno);
1268         }
1269
1270         pwm->pin_error = GPG_ERR_TIMEOUT;
1271     }
1272     else
1273         return gpg_error_from_errno(errno);
1274
1275     return 0;
1276 #endif
1277 }
1278
1279 #ifdef WITH_PINENTRY
1280 static gpg_error_t set_pinentry_strings(pwm_t *pwm, int which)
1281 {
1282     char *buf;
1283     char tmp[ASSUAN_LINELENGTH];
1284     gpg_error_t error;
1285
1286     if (!pwm->title)
1287         pwm->title = pwmd_strdup(N_("LibPWMD"));
1288
1289     if (!pwm->prompt)
1290         pwm->prompt = pwmd_strdup(N_("Passphrase:"));
1291
1292     if (!pwm->desc && !which)
1293         pwm->desc = pwmd_strdup(N_("Enter a passphrase."));
1294
1295     if (which == 1) {
1296         snprintf(tmp, sizeof(tmp), "SETERROR %s", N_("Invalid passphrase, please try again."));
1297         buf = pwmd_strdup(tmp);
1298     }
1299     else if (which == 2) {
1300         snprintf(tmp, sizeof(tmp), "SETERROR %s", N_("Please type the passphrase again for confirmation."));
1301         buf = pwmd_strdup(tmp);
1302     }
1303     else {
1304         buf = (char *)pwmd_malloc(strlen("SETERROR ") + strlen(pwm->desc) + 1);
1305         sprintf(buf, "SETERROR %s", pwm->desc);
1306     }
1307
1308     error = pinentry_command(pwm, NULL, buf);
1309     pwmd_free(buf);
1310
1311     if (error)
1312         return error;
1313
1314     buf = (char *)pwmd_malloc(strlen("SETPROMPT ") + strlen(pwm->prompt) + 1);
1315     sprintf(buf, "SETPROMPT %s", pwm->prompt);
1316     error = pinentry_command(pwm, NULL, buf);
1317     pwmd_free(buf);
1318
1319     if (error)
1320         return error;
1321
1322     buf = (char *)pwmd_malloc(strlen("SETDESC ") + strlen(pwm->title) + 1);
1323     sprintf(buf, "SETDESC %s", pwm->title);
1324     error = pinentry_command(pwm, NULL, buf);
1325     pwmd_free(buf);
1326     return error;
1327 }
1328
1329 static void update_pinentry_settings(pwm_t *pwm)
1330 {
1331     FILE *fp;
1332     char buf[LINE_MAX];
1333     char *p;
1334     struct passwd pw;
1335     char *pwbuf = _getpwuid(&pw);
1336
1337     if (!pwbuf)
1338         return;
1339
1340     snprintf(buf, sizeof(buf), "%s/.pwmd/pinentry.conf", pw.pw_dir);
1341     pwmd_free(pwbuf);
1342
1343     if ((fp = fopen(buf, "r")) == NULL)
1344         return;
1345
1346     while ((p = fgets(buf, sizeof(buf), fp)) != NULL) {
1347         char name[32], val[256];
1348
1349         if (sscanf(p, " %31[a-zA-Z] = %255s", name, val) != 2)
1350             continue;
1351
1352         if (strcasecmp(name, "TTYNAME") == 0) {
1353             pwmd_free(pwm->pinentry_tty);
1354             pwm->pinentry_tty = pwmd_strdup(val);
1355         }
1356         else if (strcasecmp(name, "TTYTYPE") == 0) {
1357             pwmd_free(pwm->pinentry_term);
1358             pwm->pinentry_term = pwmd_strdup(val);
1359         }
1360         else if (strcasecmp(name, "DISPLAY") == 0) {
1361             pwmd_free(pwm->pinentry_display);
1362             pwm->pinentry_display = pwmd_strdup(val);
1363         }
1364         else if (strcasecmp(name, "PATH") == 0) {
1365             pwmd_free(pwm->pinentry_path);
1366             pwm->pinentry_path = pwmd_strdup(val);
1367         }
1368     }
1369
1370     fclose(fp);
1371 }
1372
1373 static gpg_error_t launch_pinentry(pwm_t *pwm)
1374 {
1375     int rc;
1376     assuan_context_t ctx;
1377     int child_list[] = {-1};
1378     char *display = getenv("DISPLAY");
1379     const char *argv[10];
1380     const char **p = argv;
1381     int have_display = 0;
1382     char *tty = NULL;
1383     char *ttybuf = NULL;
1384
1385     update_pinentry_settings(pwm);
1386
1387     if (pwm->pinentry_display || display)
1388         have_display = 1;
1389     else {
1390         if (!pwm->pinentry_tty) {
1391             ttybuf = pwmd_malloc(255);
1392
1393             if (!ttybuf)
1394                 return gpg_error_from_errno(ENOMEM);
1395
1396             rc = ttyname_r(STDOUT_FILENO, ttybuf, 255);
1397
1398             if (rc) {
1399                 pwmd_free(ttybuf);
1400                 return gpg_error_from_errno(rc);
1401             }
1402
1403             tty = ttybuf;
1404         }
1405         else
1406             tty = pwm->pinentry_tty;
1407     }
1408
1409     if (!have_display && !tty)
1410         return GPG_ERR_ENOTTY;
1411
1412     *p++ = "pinentry";
1413     *p++ = have_display ? "--display" : "--ttyname";
1414     *p++ = have_display ? pwm->pinentry_display ? pwm->pinentry_display : display : tty;
1415
1416     if (pwm->lcctype) {
1417         *p++ = "--lc-ctype";
1418         *p++ = pwm->lcctype;
1419     }
1420
1421     if (pwm->lcmessages) {
1422         *p++ = "--lc-messages";
1423         *p++ = pwm->lcmessages;
1424     }
1425
1426     *p = NULL;
1427
1428     if (!have_display) {
1429         *p++ = "--ttytype";
1430         *p++ = pwm->pinentry_term ? pwm->pinentry_term : getenv("TERM");
1431         *p = NULL;
1432     }
1433
1434     rc = assuan_pipe_connect(&ctx, pwm->pinentry_path ? pwm->pinentry_path : PINENTRY_PATH, argv, child_list);
1435
1436     if (ttybuf)
1437         pwmd_free(ttybuf);
1438
1439     if (rc)
1440         return rc;
1441
1442     pwm->pid = assuan_get_pid(ctx);
1443     pwm->pctx = ctx;
1444     return set_pinentry_strings(pwm, 0);
1445 }
1446
1447 static gpg_error_t pinentry_command(pwm_t *pwm, char **result, const char *cmd)
1448 {
1449     gpg_error_t n;
1450
1451     if (!pwm->pctx) {
1452         n = launch_pinentry(pwm);
1453
1454         if (n)
1455             return n;
1456     }
1457
1458     return assuan_command(pwm, pwm->pctx, result, cmd);
1459 }
1460
1461 static void pinentry_disconnect(pwm_t *pwm)
1462 {
1463     if (pwm->pctx)
1464         assuan_disconnect(pwm->pctx);
1465
1466     pwm->pctx = NULL;
1467     pwm->pid = -1;
1468 }
1469
1470 /*
1471  * Only called from a child process.
1472  */
1473 static void catchsig(int sig)
1474 {
1475     switch (sig) {
1476         case SIGALRM:
1477             if (gelapsed++ >= gtimeout) {
1478                 global_error = pwmd_terminate_pinentry(gpwm);
1479
1480                 if (!global_error)
1481                     global_error = GPG_ERR_TIMEOUT;
1482
1483                 break;
1484             }
1485
1486             alarm(1);
1487             break;
1488         default:
1489             break;
1490     }
1491 }
1492 #endif
1493
1494 /*
1495  * Borrowed from libassuan.
1496  */
1497 static char *percent_escape(const char *atext)
1498 {
1499     const unsigned char *s;
1500     int len = strlen(atext) * 3 + 1;
1501     char *buf = (char *)pwmd_malloc(len), *p = buf;
1502
1503     if (!buf)
1504         return NULL;
1505
1506     for (s=(const unsigned char *)atext; *s; s++) {
1507         if (*s < ' ') {
1508             sprintf (p, "%%%02X", *s);
1509             p += 3;
1510         }
1511         else
1512             *p++ = *s;
1513     }
1514
1515     *p = 0;
1516     return buf;
1517 }
1518
1519 static gpg_error_t send_command(pwm_t *pwm, char **result, const char *cmd)
1520 {
1521     if (!cmd)
1522         return GPG_ERR_INV_ARG;
1523
1524     return assuan_command(pwm, pwm->ctx, result, cmd);
1525 }
1526
1527 gpg_error_t pwmd_command_ap(pwm_t *pwm, char **result, const char *cmd,
1528         va_list ap)
1529 {
1530     char *buf;
1531     size_t len;
1532     gpg_error_t error;
1533
1534     if (!pwm || !cmd)
1535         return GPG_ERR_INV_ARG;
1536
1537     /*
1538      * C99 allows the dst pointer to be null which will calculate the length
1539      * of the would-be result and return it.
1540      */
1541     len = vsnprintf(NULL, 0, cmd, ap)+1;
1542     buf = (char *)pwmd_malloc(len);
1543     len = vsnprintf(buf, len, cmd, ap);
1544     error = send_command(pwm, result, buf);
1545     pwmd_free(buf);
1546     return error;
1547 }
1548
1549 /*
1550  * Avoid sending the BYE command here. libassuan will close the file
1551  * descriptor and release the assuan context. Use pwmd_close() instead.
1552  */
1553 gpg_error_t pwmd_command(pwm_t *pwm, char **result, const char *cmd, ...)
1554 {
1555     va_list ap;
1556     gpg_error_t error;
1557
1558     if (!pwm || !cmd)
1559         return GPG_ERR_INV_ARG;
1560
1561     if (result)
1562         *result = NULL;
1563
1564     va_start(ap, cmd);
1565     error = pwmd_command_ap(pwm, result, cmd, ap);
1566     va_end(ap);
1567     return error;
1568 }
1569
1570 #ifdef WITH_PINENTRY
1571 static gpg_error_t do_getpin(pwm_t *pwm, char **result)
1572 {
1573     if (gtimeout) {
1574         signal(SIGALRM, catchsig);
1575         alarm(1);
1576     }
1577
1578     *result = NULL;
1579     return pinentry_command(pwm, result, "GETPIN");
1580 }
1581
1582 static gpg_error_t getpin(pwm_t *pwm, char **result, int *try_n, int which)
1583 {
1584     int pin_try = *try_n;
1585     gpg_error_t error;
1586
1587 getpin_again:
1588     *try_n = pin_try;
1589
1590     if (pin_try == -1) {
1591         error = set_pinentry_strings(pwm, which);
1592
1593         if (error) {
1594             pinentry_disconnect(pwm);
1595             return error;
1596         }
1597     }
1598     else {
1599         if (pwm->pinentry_tries-1 != pin_try) {
1600             error = set_pinentry_strings(pwm, 1);
1601
1602             if (error) {
1603                 pinentry_disconnect(pwm);
1604                 return error;
1605             }
1606         }
1607     }
1608
1609     error = do_getpin(pwm, result);
1610
1611     /*
1612      * Since there was input cancel any timeout setting.
1613      */
1614     alarm(0);
1615
1616     if (error) {
1617         if (error == GPG_ERR_CANCELED)
1618             return GPG_ERR_CANCELED;
1619
1620         if (pin_try != -1 && pin_try--)
1621             goto getpin_again;
1622
1623         if (pwm->pctx)
1624             pinentry_disconnect(pwm);
1625
1626         *try_n = pin_try;
1627         return error;
1628     }
1629
1630     return 0;
1631 }
1632 #endif
1633
1634 gpg_error_t pwmd_open_nb_finalize(pwm_t *pwm, pwmd_nb_status_t *pw)
1635 {
1636     gpg_error_t error;
1637
1638 #ifndef WITH_PINENTRY
1639     return GPG_ERR_NOT_IMPLEMENTED;
1640 #endif
1641
1642     if (!pwm || !pw || !pw->filename[0])
1643         return GPG_ERR_INV_ARG;
1644
1645     close(pw->fd);
1646
1647     if (pw->error) {
1648         error = pw->error;
1649         goto fail;
1650     }
1651
1652     if (pwm->filename)
1653         pwmd_free(pwm->filename);
1654
1655     pwm->filename = pwmd_strdup(pw->filename);
1656     memset(pw, 0, sizeof(pwmd_nb_status_t));
1657     return 0;
1658
1659 fail:
1660     memset(pw, 0, sizeof(pwmd_nb_status_t));
1661     return error;
1662 }
1663
1664 static gpg_error_t do_open_command(pwm_t *pwm, const char *filename, char *password)
1665 {
1666     char buf[ASSUAN_LINELENGTH];
1667     gpg_error_t error;
1668     char *result = NULL;
1669
1670     snprintf(buf, sizeof(buf), "OPEN %s %s", filename, password ? password : "");
1671     error = send_command(pwm, &result, buf);
1672     memset(buf, 0, sizeof(buf));
1673
1674     if (error && result)
1675         pwmd_free(result);
1676
1677     return error;
1678 }
1679
1680 static int do_pwmd_open(pwm_t *pwm, gpg_error_t *error, const char *filename,
1681         int nb, int timeout)
1682 {
1683     char *result = NULL;
1684     char *password = NULL;
1685     char path[PATH_MAX];
1686 #ifdef WITH_PINENTRY
1687     int pin_try;
1688 #endif
1689
1690     if (!pwm || !filename || !*filename) {
1691         *error = GPG_ERR_INV_ARG;
1692         return nb ? -1 : 1;
1693     }
1694
1695 #ifdef WITH_PINENTRY
1696     pin_try = pwm->pinentry_tries - 1;
1697 #endif
1698
1699     /*
1700      * Avoid calling pinentry if the password is cached on the server or if
1701      * this is a new file.
1702      */
1703     *error = pwmd_command(pwm, &result, "GETCONFIG data_directory");
1704
1705     if (*error)
1706         return nb ? -1 : 1;
1707
1708     snprintf(path, sizeof(path), "%s/%s", result, filename);
1709     pwmd_free(result);
1710
1711     if (access(path, R_OK) == -1) {
1712         if (errno == ENOENT)
1713             goto gotpassword;
1714     }
1715
1716     *error = pwmd_command(pwm, &result, "ISCACHED %s", filename);
1717
1718     if (*error == EPWMD_CACHE_NOT_FOUND) {
1719         if (pwm->passfunc) {
1720             password = (char *)pwm->passfunc(pwm->passdata);
1721             goto gotpassword;
1722         }
1723
1724 #ifdef WITH_PINENTRY
1725         /*
1726          * Get the password from pinentry.
1727          */
1728         if (pwm->use_pinentry) {
1729             /*
1730              * Nonblocking is wanted. fork() then return a file descriptor
1731              * that the client can use to read() from.
1732              */
1733             if (nb) {
1734                 int p[2];
1735                 pid_t pid;
1736                 pwmd_nb_status_t pw;
1737
1738                 if (pipe(p) == -1) {
1739                     *error = gpg_error_from_syserror();
1740                     return -1;
1741                 }
1742
1743 #ifdef WITH_LIBPTH
1744                 pid = pth_fork();
1745 #else
1746                 pid = fork();
1747 #endif
1748
1749                 switch (pid) {
1750                     case 0:
1751                         close(p[0]);
1752                         strncpy(pw.filename, filename, sizeof(pw.filename));
1753                         pw.filename[sizeof(pw.filename)-1] = 0;
1754                         pw.fd = p[0];
1755
1756                         if (timeout > 0) {
1757                             gpwm = pwm;
1758                             gtimeout = timeout;
1759                             gelapsed = 0;
1760                         }
1761
1762 getpin_nb_again:
1763                         *error = getpin(pwm, &password, &pin_try, 0);
1764
1765                         if (*error) {
1766 getpin_nb_fail:
1767                             if (pwm->pctx)
1768                                 pinentry_disconnect(pwm);
1769
1770                             if (gtimeout && gelapsed >= gtimeout)
1771                                 *error = GPG_ERR_TIMEOUT;
1772
1773                             pw.error = *error;
1774 #ifdef WITH_LIBPTH
1775                             pth_write(p[1], &pw, sizeof(pw));
1776 #else
1777                             write(p[1], &pw, sizeof(pw));
1778 #endif
1779                             close(p[1]);
1780                             _exit(1);
1781                         }
1782
1783                         /*
1784                          * Don't count the time it takes to open the file
1785                          * which may have many iterations.
1786                          */
1787                         signal(SIGALRM, SIG_DFL);
1788                         *error = do_open_command(pwm, filename, password);
1789
1790                         if (timeout)
1791                             signal(SIGALRM, catchsig);
1792
1793                         if (pwm->pctx && *error == EPWMD_BADKEY) {
1794                             if (pin_try-- > 0)
1795                                 goto getpin_nb_again;
1796
1797                             goto getpin_nb_fail;
1798                         }
1799
1800                         pinentry_disconnect(pwm);
1801                         pw.error = 0;
1802 #ifdef WITH_LIBPTH
1803                         pth_write(p[1], &pw, sizeof(pw));
1804 #else
1805                         write(p[1], &pw, sizeof(pw));
1806 #endif
1807                         close(p[1]);
1808                         _exit(0);
1809                         break;
1810                     case -1:
1811                         *error = gpg_error_from_syserror();
1812                         close(p[0]);
1813                         close(p[1]);
1814                         return -1;
1815                     default:
1816                         break;
1817                 }
1818
1819                 close(p[1]);
1820                 *error = 0;
1821                 return p[0];
1822             }
1823         }
1824         else {
1825 #endif
1826             /*
1827              * Not using pinentry and the file was not found
1828              * in the cache.
1829              */
1830             password = pwm->password;
1831 #ifdef WITH_PINENTRY
1832         }
1833 #endif
1834     }
1835     else if (*error)
1836         return nb ? -1 : 1;
1837
1838 gotpassword:
1839     *error = do_open_command(pwm, filename, password);
1840
1841     /*
1842      * Keep the user defined password set with pwmd_setopt(). The password may
1843      * be needed later (pwmd_save()) depending on the pwmd file cache settings.
1844      */
1845     if (!pwm->passfunc && password && password != pwm->password)
1846         pwmd_free(password);
1847
1848 #ifdef WITH_PINENTRY
1849     if (*error == EPWMD_BADKEY) {
1850         if (pin_try-- > 0 && !nb) {
1851             *error = pwmd_command(pwm, &result, "OPTION TITLE=%s",
1852                     N_("Invalid passphrase, please try again."));
1853
1854             if (*error)
1855                 return 1;
1856
1857             goto gotpassword;
1858         }
1859
1860         if (nb)
1861             pinentry_disconnect(pwm);
1862
1863         return nb ? -1 : 1;
1864     }
1865 #endif
1866
1867     if (!*error) {
1868         if (pwm->filename)
1869             pwmd_free(pwm->filename);
1870
1871         pwm->filename = pwmd_strdup(filename);
1872     }
1873
1874     /*
1875      * The file is cached or the file is a new file.
1876      */
1877     if (nb)
1878         return *error ? -1 : -2;
1879
1880     return *error ? 1 : 0;
1881 }
1882
1883 gpg_error_t pwmd_open(pwm_t *pwm, const char *filename)
1884 {
1885     gpg_error_t error;
1886
1887     do_pwmd_open(pwm, &error, filename, 0, 0);
1888     return error;
1889 }
1890
1891 int pwmd_open_nb(pwm_t *pwm, gpg_error_t *error, const char *filename,
1892         int timeout)
1893 {
1894 #ifndef WITH_PINENTRY
1895     *error = GPG_ERR_NOT_IMPLEMENTED;
1896     return -1;
1897 #else
1898     return do_pwmd_open(pwm, error, filename, 1, timeout);
1899 #endif
1900 }
1901
1902 #ifdef WITH_PINENTRY
1903 static gpg_error_t do_save_getpin(pwm_t *pwm, char **password)
1904 {
1905     int confirm = 0;
1906     gpg_error_t error;
1907     char *result = NULL;
1908     int pin_try = -1;
1909
1910 again:
1911     error = getpin(pwm, &result, &pin_try, confirm ? 2 : 0);
1912
1913     if (error) {
1914         if (pwm->pctx)
1915             pinentry_disconnect(pwm);
1916
1917         if (*password)
1918             pwmd_free(*password);
1919
1920         return error;
1921     }
1922
1923     if (!confirm++) {
1924         *password = result;
1925         goto again;
1926     }
1927
1928     if (strcmp(*password, result)) {
1929         pwmd_free(*password);
1930         pwmd_free(result);
1931         pinentry_disconnect(pwm);
1932         error = EPWMD_BADKEY;
1933         return error;
1934     }
1935
1936     pwmd_free(result);
1937     pinentry_disconnect(pwm);
1938     return 0;
1939 }
1940 #endif
1941
1942 static gpg_error_t do_save_command(pwm_t *pwm, char *password)
1943 {
1944     char buf[ASSUAN_LINELENGTH];
1945     gpg_error_t error;
1946     char *result = NULL;
1947
1948     snprintf(buf, sizeof(buf), "SAVE %s", password ? password : "");
1949     error = send_command(pwm, &result, buf);
1950     memset(&buf, 0, sizeof(buf));
1951
1952     if (error && result)
1953         pwmd_free(result);
1954
1955     return error;
1956 }
1957
1958 gpg_error_t pwmd_save_nb_finalize(pwm_t *pwm, pwmd_nb_status_t *pw)
1959 {
1960     gpg_error_t rc;
1961
1962 #ifndef WITH_PINENTRY
1963     return GPG_ERR_NOT_IMPLEMENTED;
1964 #endif
1965
1966     if (!pwm || !pw || !pw->filename[0])
1967         return GPG_ERR_INV_ARG;
1968
1969     close(pw->fd);
1970     rc = pw->error;
1971     memset(pw, 0, sizeof(pwmd_nb_status_t));
1972     return rc;
1973 }
1974
1975 static int do_pwmd_save(pwm_t *pwm, gpg_error_t *error, int nb)
1976 {
1977     char *result = NULL;
1978     char *password = NULL;
1979
1980     if (!pwm) {
1981         *error = GPG_ERR_INV_ARG;
1982         return nb ? -1 : 1;
1983     }
1984
1985     if (pwm->use_pinentry || pwm->passfunc) {
1986         *error = pwmd_command(pwm, &result, "ISCACHED %s", pwm->filename);
1987
1988         if (*error == 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                         *error = gpg_error_from_syserror();
2000                         return -1;
2001                     }
2002
2003 #ifdef WITH_LIBPTH
2004                     pid = pth_fork();
2005 #else
2006                     pid = fork();
2007 #endif
2008
2009                     switch (pid) {
2010                         case 0:
2011                             close(p[0]);
2012                             strncpy(pw.filename, pwm->filename, sizeof(pw.filename));
2013                             pw.filename[sizeof(pw.filename)-1] = 0;
2014                             pw.fd = p[0];
2015
2016                             do {
2017                                 password = NULL;
2018                                 *error = do_save_getpin(pwm, &password);
2019                             } while (*error == EPWMD_BADKEY);
2020
2021                             if (*error) {
2022                                 if (pwm->pctx)
2023                                     pinentry_disconnect(pwm);
2024
2025                                 pw.error = *error;
2026 #ifdef WITH_LIBPTH
2027                                 pth_write(p[1], &pw, sizeof(pw));
2028 #else
2029                                 write(p[1], &pw, sizeof(pw));
2030 #endif
2031                                 close(p[1]);
2032                                 _exit(1);
2033                             }
2034
2035                             *error = do_save_command(pwm, password);
2036                             pinentry_disconnect(pwm);
2037                             pw.error = *error;
2038 #ifdef WITH_LIBPTH
2039                             pth_write(p[1], &pw, sizeof(pw));
2040 #else
2041                             write(p[1], &pw, sizeof(pw));
2042 #endif
2043                             close(p[1]);
2044                             _exit(0);
2045                             break;
2046                         case -1:
2047                             *error = gpg_error_from_syserror();
2048                             close(p[0]);
2049                             close(p[1]);
2050                             return -1;
2051                         default:
2052                             break;
2053                     }
2054
2055                     close(p[1]);
2056                     *error = 0;
2057                     return p[0];
2058                 }
2059
2060                 *error = do_save_getpin(pwm, &password);
2061
2062                 if (*error)
2063                     return 1;
2064             }
2065 #endif
2066         }
2067         else {
2068             if (*error)
2069                 return nb ? -1 : 1;
2070         }
2071     }
2072     else
2073         password = pwm->password;
2074
2075     *error = do_save_command(pwm, password);
2076
2077     if (!pwm->passfunc && password && password != pwm->password)
2078         pwmd_free(password);
2079
2080     if (nb)
2081         return *error ? -1 : -2;
2082
2083     return *error ? 1 : 0;
2084 }
2085
2086 int pwmd_save_nb(pwm_t *pwm, gpg_error_t *error)
2087 {
2088 #ifndef WITH_PINENTRY
2089     *error = GPG_ERR_NOT_IMPLEMENTED;
2090     return -1;
2091 #else
2092     return do_pwmd_save(pwm, error, 1);
2093 #endif
2094 }
2095
2096 gpg_error_t pwmd_save(pwm_t *pwm)
2097 {
2098     gpg_error_t error;
2099
2100     do_pwmd_save(pwm, &error, 0);
2101     return error;
2102 }
2103
2104 gpg_error_t pwmd_setopt(pwm_t *pwm, pwmd_option_t opt, ...)
2105 {
2106     va_list ap;
2107     int n = va_arg(ap, int);
2108     char *result;
2109     char *arg1;
2110     gpg_error_t error = 0;
2111
2112     if (!pwm)
2113         return GPG_ERR_INV_ARG;
2114
2115     va_start(ap, opt);
2116
2117     switch (opt) {
2118         case PWMD_OPTION_STATUS_FUNC:
2119             pwm->status_func = va_arg(ap, pwmd_status_fn);
2120             break;
2121         case PWMD_OPTION_STATUS_DATA:
2122             pwm->status_data = va_arg(ap, void *);
2123             break;
2124         case PWMD_OPTION_PASSWORD_FUNC:
2125             pwm->passfunc = va_arg(ap, pwmd_password_fn);
2126             break;
2127         case PWMD_OPTION_PASSWORD_DATA:
2128             pwm->passdata = va_arg(ap, void *);
2129             break;
2130         case PWMD_OPTION_PASSWORD:
2131             arg1 = va_arg(ap, char *);
2132
2133             if (pwm->password)
2134                 pwmd_free(pwm->password);
2135
2136             pwm->password = pwmd_strdup(arg1);
2137             break;
2138         case PWMD_OPTION_PINENTRY:
2139             n = va_arg(ap, int);
2140
2141             if (n != 0 && n != 1) {
2142                 va_end(ap);
2143                 error = GPG_ERR_INV_VALUE;
2144             }
2145             else {
2146                 pwm->use_pinentry = n;
2147                 error = pwmd_command(pwm, &result, "OPTION PINENTRY=%i",
2148                         !pwm->use_pinentry);
2149             }
2150             break;
2151 #ifdef WITH_PINENTRY
2152         case PWMD_OPTION_PINENTRY_TRIES:
2153             n = va_arg(ap, int);
2154
2155             if (n <= 0) {
2156                 va_end(ap);
2157                 error = GPG_ERR_INV_VALUE;
2158             }
2159             else
2160                 pwm->pinentry_tries = n;
2161             break;
2162 #endif
2163         case PWMD_OPTION_PINENTRY_TIMEOUT:
2164             n = va_arg(ap, int);
2165
2166             if (n < 0) {
2167                 va_end(ap);
2168                 error = GPG_ERR_INV_VALUE;
2169             }
2170             else
2171                 pwm->pinentry_timeout = n;
2172
2173             if (!pwm->use_pinentry)
2174                 error = pwmd_command(pwm, &result, "OPTION TIMEOUT=%i",
2175                         pwm->pinentry_timeout);
2176             break;
2177         case PWMD_OPTION_PINENTRY_PATH:
2178             if (pwm->pinentry_path)
2179                 pwmd_free(pwm->pinentry_path);
2180
2181             pwm->pinentry_path = pwmd_strdup(va_arg(ap, char *));
2182
2183             if (!pwm->use_pinentry)
2184                 error = pwmd_command(pwm, &result, "OPTION PATH=%s",
2185                         pwm->pinentry_path);
2186             break;
2187         case PWMD_OPTION_PINENTRY_TTY:
2188             if (pwm->pinentry_tty)
2189                 pwmd_free(pwm->pinentry_tty);
2190
2191             pwm->pinentry_tty = pwmd_strdup(va_arg(ap, char *));
2192
2193             if (!pwm->use_pinentry)
2194                 error = pwmd_command(pwm, &result, "OPTION TTY=%s",
2195                         pwm->pinentry_tty);
2196             break;
2197         case PWMD_OPTION_PINENTRY_DISPLAY:
2198             if (pwm->pinentry_display)
2199                 pwmd_free(pwm->pinentry_display);
2200
2201             pwm->pinentry_display = pwmd_strdup(va_arg(ap, char *));
2202
2203             if (!pwm->use_pinentry)
2204                 error = pwmd_command(pwm, &result, "OPTION DISPLAY=%s",
2205                         pwm->pinentry_display);
2206             break;
2207         case PWMD_OPTION_PINENTRY_TERM:
2208             if (pwm->pinentry_term)
2209                 pwmd_free(pwm->pinentry_term);
2210
2211             pwm->pinentry_term = pwmd_strdup(va_arg(ap, char *));
2212
2213             if (!pwm->use_pinentry)
2214                 error = pwmd_command(pwm, &result, "OPTION TTYTYPE=%s",
2215                         pwm->pinentry_term);
2216             break;
2217         case PWMD_OPTION_PINENTRY_TITLE:
2218             if (pwm->title)
2219                 pwmd_free(pwm->title);
2220
2221             pwm->title = percent_escape(va_arg(ap, char *));
2222
2223             if (!pwm->use_pinentry)
2224                 error = pwmd_command(pwm, &result, "OPTION TITLE=%s",
2225                         pwm->title);
2226             break;
2227         case PWMD_OPTION_PINENTRY_PROMPT:
2228             if (pwm->prompt)
2229                 pwmd_free(pwm->prompt);
2230
2231             pwm->prompt = percent_escape(va_arg(ap, char *));
2232
2233             if (!pwm->use_pinentry)
2234                 error = pwmd_command(pwm, &result, "OPTION PROMPT=%s",
2235                         pwm->prompt);
2236             break;
2237         case PWMD_OPTION_PINENTRY_DESC:
2238             if (pwm->desc)
2239                 pwmd_free(pwm->desc);
2240
2241             pwm->desc = percent_escape(va_arg(ap, char *));
2242
2243             if (!pwm->use_pinentry)
2244                 error = pwmd_command(pwm, &result, "OPTION DESC=%s",
2245                         pwm->desc);
2246             break;
2247         case PWMD_OPTION_PINENTRY_LC_CTYPE:
2248             if (pwm->lcctype)
2249                 pwmd_free(pwm->lcctype);
2250
2251             pwm->lcctype = pwmd_strdup(va_arg(ap, char *));
2252
2253             if (!pwm->use_pinentry)
2254                 error = pwmd_command(pwm, &result, "OPTION LC_CTYPE=%s",
2255                         pwm->lcctype);
2256             break;
2257         case PWMD_OPTION_PINENTRY_LC_MESSAGES:
2258             if (pwm->lcmessages)
2259                 pwmd_free(pwm->lcmessages);
2260
2261             pwm->lcmessages = pwmd_strdup(va_arg(ap, char *));
2262
2263             if (!pwm->use_pinentry)
2264                 error = pwmd_command(pwm, &result, "OPTION LC_MESSAGES=%s",
2265                         pwm->lcmessages);
2266             break;
2267         default:
2268             error = GPG_ERR_NOT_IMPLEMENTED;
2269             break;
2270     }
2271
2272     va_end(ap);
2273     return error;
2274 }
2275
2276 gpg_error_t pwmd_get_fd(pwm_t *pwm, int *fd)
2277 {
2278     if (!pwm)
2279         return GPG_ERR_INV_ARG;
2280
2281     if (pwm->fd == -1)
2282         return GPG_ERR_INV_STATE;
2283
2284     *fd = pwm->fd;
2285     return 0;
2286 }
2287
2288 pwm_t *pwmd_new(const char *name)
2289 {
2290     pwm_t *h = pwmd_malloc(sizeof(pwm_t));
2291
2292     if (!h)
2293         return NULL;
2294
2295     if (name) {
2296         h->name = pwmd_strdup(name);
2297
2298         if (!h->name) {
2299             pwmd_free(h);
2300             return NULL;
2301         }
2302     }
2303
2304     return h;
2305 }
2306
2307 void pwmd_free(void *ptr)
2308 {
2309     xfree(ptr);
2310 }
2311
2312 void *pwmd_malloc(size_t size)
2313 {
2314     return xmalloc(size);
2315 }
2316
2317 void *pwmd_calloc(size_t nmemb, size_t size)
2318 {
2319     return xcalloc(nmemb, size);
2320 }
2321
2322 void *pwmd_realloc(void *ptr, size_t size)
2323 {
2324     return xrealloc(ptr, size);
2325 }
2326
2327 char *pwmd_strdup(const char *str)
2328 {
2329     return xstrdup(str);
2330 }