libopkg/opkg_download.c

   1 /* vi: set noexpandtab sw=4 sts=4: */
   2 /* opkg_download.c - the opkg package management system
   3
   4    Carl D. Worth
   5
   6    Copyright (C) 2001 University of Southern California
   7    Copyright (C) 2008 OpenMoko Inc
   8
   9    This program is free software; you can redistribute it and/or
  10    modify it under the terms of the GNU General Public License as
  11    published by the Free Software Foundation; either version 2, or (at
  12    your option) any later version.
  13
  14    This program is distributed in the hope that it will be useful, but
  15    WITHOUT ANY WARRANTY; without even the implied warranty of
  16    MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
  17    General Public License for more details.
  18 */
  19
  20 #include "config.h"
  21
  22 #include <sys/wait.h>
  23 #include <stdio.h>
  24 #include <unistd.h>
  25 #include <libgen.h>
  26
  27 #include "opkg_download.h"
  28 #include "opkg_message.h"
  29
  30 #include "sprintf_alloc.h"
  31 #include "xsystem.h"
  32 #include "file_util.h"
  33 #include "opkg_defines.h"
  34 #include "libbb/libbb.h"
  35
  36 #ifdef HAVE_CURL
  37 #include <curl/curl.h>
  38 #endif
  39
  40 #if defined(HAVE_SSLCURL) || defined(HAVE_OPENSSL)
  41 #include <openssl/conf.h>
  42 #include <openssl/evp.h>
  43 #include <openssl/err.h>
  44 #include <openssl/ssl.h>
  45 #endif
  46
  47 #if defined(HAVE_GPGME)
  48 #include <gpgme.h>
  49 #elif defined(HAVE_OPENSSL)
  50 #include <openssl/bio.h>
  51 #include <openssl/objects.h>
  52 #include <openssl/x509.h>
  53 #include <openssl/pem.h>
  54 #include <openssl/hmac.h>
  55 #endif
  56
  57 #ifdef HAVE_PATHFINDER
  58 #include "opkg_pathfinder.h"
  59 #endif
  60
  61 #if defined(HAVE_OPENSSL) || defined(HAVE_SSLCURL)
  62 static void openssl_init(void);
  63 #endif
  64
  65 #ifdef HAVE_OPENSSL
  66 static X509_STORE *setup_verify(char *CAfile, char *CApath);
  67 #endif
  68
  69 #ifdef HAVE_CURL
  70 /*
  71  * Make curl an instance variable so we don't have to instanciate it
  72  * each time
  73  */
  74 static CURL *curl = NULL;
  75 static CURL *opkg_curl_init(curl_progress_func cb, void *data);
  76 #endif
  77
  78 static int str_starts_with(const char *str, const char *prefix)
  79 {
  80         return (strncmp(str, prefix, strlen(prefix)) == 0);
  81 }
  82
  83 int
  84 opkg_download(const char *src, const char *dest_file_name,
  85               curl_progress_func cb, void *data, const short hide_error)
  86 {
  87         int err = 0;
  88
  89         char *src_basec = xstrdup(src);
  90         char *src_base = basename(src_basec);
  91         char *tmp_file_location;
  92
  93         opkg_msg(NOTICE, "Downloading %s\n", src);
  94
  95         if (str_starts_with(src, "file:")) {
  96                 const char *file_src = src + 5;
  97                 opkg_msg(INFO, "Copying %s to %s...", file_src, dest_file_name);
  98                 err = file_copy(file_src, dest_file_name);
  99                 opkg_msg(INFO, "Done.\n");
 100                 free(src_basec);
 101                 return err;
 102         }
 103
 104         sprintf_alloc(&tmp_file_location, "%s/%s", conf->tmp_dir, src_base);
 105         free(src_basec);
 106         err = unlink(tmp_file_location);
 107         if (err && errno != ENOENT) {
 108                 opkg_perror(ERROR, "Failed to unlink %s", tmp_file_location);
 109                 free(tmp_file_location);
 110                 return -1;
 111         }
 112
 113         if (conf->http_proxy) {
 114                 opkg_msg(DEBUG,
 115                          "Setting environment variable: http_proxy = %s.\n",
 116                          conf->http_proxy);
 117                 setenv("http_proxy", conf->http_proxy, 1);
 118         }
 119         if (conf->ftp_proxy) {
 120                 opkg_msg(DEBUG,
 121                          "Setting environment variable: ftp_proxy = %s.\n",
 122                          conf->ftp_proxy);
 123                 setenv("ftp_proxy", conf->ftp_proxy, 1);
 124         }
 125         if (conf->no_proxy) {
 126                 opkg_msg(DEBUG,
 127                          "Setting environment variable: no_proxy = %s.\n",
 128                          conf->no_proxy);
 129                 setenv("no_proxy", conf->no_proxy, 1);
 130         }
 131 #ifdef HAVE_CURL
 132         CURLcode res;
 133         FILE *file = fopen(tmp_file_location, "w");
 134
 135         curl = opkg_curl_init(cb, data);
 136         if (curl) {
 137                 curl_easy_setopt(curl, CURLOPT_URL, src);
 138                 curl_easy_setopt(curl, CURLOPT_WRITEDATA, file);
 139
 140                 res = curl_easy_perform(curl);
 141                 fclose(file);
 142                 if (res) {
 143                         long error_code;
 144                         curl_easy_getinfo(curl, CURLINFO_RESPONSE_CODE,
 145                                           &error_code);
 146                         opkg_msg(hide_error ? DEBUG2 : ERROR,
 147                                  "Failed to download %s: %s.\n", src,
 148                                  curl_easy_strerror(res));
 149                         free(tmp_file_location);
 150                         return -1;
 151                 }
 152
 153         } else {
 154                 free(tmp_file_location);
 155                 return -1;
 156         }
 157 #else
 158         {
 159                 int res;
 160                 const char *argv[8];
 161                 int i = 0;
 162
 163                 argv[i++] = "wget";
 164                 argv[i++] = "-q";
 165                 if (conf->http_proxy || conf->ftp_proxy) {
 166                         argv[i++] = "-Y";
 167                         argv[i++] = "on";
 168                 }
 169                 argv[i++] = "-O";
 170                 argv[i++] = tmp_file_location;
 171                 argv[i++] = src;
 172                 argv[i++] = NULL;
 173                 res = xsystem(argv);
 174
 175                 if (res) {
 176                         opkg_msg(ERROR,
 177                                  "Failed to download %s, wget returned %d.\n",
 178                                  src, res);
 179                         if (res == 4)
 180                                 opkg_msg(ERROR,
 181                                          "Check your network settings and connectivity.\n\n");
 182                         free(tmp_file_location);
 183                         return -1;
 184                 }
 185         }
 186 #endif
 187
 188         err = file_move(tmp_file_location, dest_file_name);
 189
 190         free(tmp_file_location);
 191
 192         return err;
 193 }
 194
 195 static int
 196 opkg_download_cache(const char *src, const char *dest_file_name,
 197                     curl_progress_func cb, void *data)
 198 {
 199         char *cache_name = xstrdup(src);
 200         char *cache_location, *p;
 201         int err = 0;
 202
 203         if (!conf->cache || str_starts_with(src, "file:")) {
 204                 err = opkg_download(src, dest_file_name, cb, data, 0);
 205                 goto out1;
 206         }
 207
 208         if (!file_is_dir(conf->cache)) {
 209                 opkg_msg(ERROR, "%s is not a directory.\n", conf->cache);
 210                 err = 1;
 211                 goto out1;
 212         }
 213
 214         for (p = cache_name; *p; p++)
 215                 if (*p == '/')
 216                         *p = ',';       /* looks nicer than | or # */
 217
 218         sprintf_alloc(&cache_location, "%s/%s", conf->cache, cache_name);
 219         if (file_exists(cache_location))
 220                 opkg_msg(NOTICE, "Copying %s.\n", cache_location);
 221         else {
 222                 /* cache file with funky name not found, try simple name */
 223                 free(cache_name);
 224                 char *filename = strrchr(dest_file_name, '/');
 225                 if (filename)
 226                         cache_name = xstrdup(filename + 1);     // strip leading '/'
 227                 else
 228                         cache_name = xstrdup(dest_file_name);
 229                 free(cache_location);
 230                 sprintf_alloc(&cache_location, "%s/%s", conf->cache,
 231                               cache_name);
 232                 if (file_exists(cache_location))
 233                         opkg_msg(NOTICE, "Copying %s.\n", cache_location);
 234                 else {
 235                         err = opkg_download(src, cache_location, cb, data, 0);
 236                         if (err) {
 237                                 (void)unlink(cache_location);
 238                                 goto out2;
 239                         }
 240                 }
 241         }
 242
 243         err = file_copy(cache_location, dest_file_name);
 244
 245 out2:
 246         free(cache_location);
 247 out1:
 248         free(cache_name);
 249         return err;
 250 }
 251
 252 int opkg_download_pkg(pkg_t * pkg, const char *dir)
 253 {
 254         int err;
 255         char *url;
 256         char *stripped_filename;
 257
 258         if (pkg->src == NULL) {
 259                 opkg_msg(ERROR,
 260                          "Package %s is not available from any configured src.\n",
 261                          pkg->name);
 262                 return -1;
 263         }
 264         if (pkg->filename == NULL) {
 265                 opkg_msg(ERROR,
 266                          "Package %s does not have a valid filename field.\n",
 267                          pkg->name);
 268                 return -1;
 269         }
 270
 271         sprintf_alloc(&url, "%s/%s", pkg->src->value, pkg->filename);
 272
 273         /* The pkg->filename might be something like
 274            "../../foo.opk". While this is correct, and exactly what we
 275            want to use to construct url above, here we actually need to
 276            use just the filename part, without any directory. */
 277
 278         stripped_filename = strrchr(pkg->filename, '/');
 279         if (!stripped_filename)
 280                 stripped_filename = pkg->filename;
 281
 282         sprintf_alloc(&pkg->local_filename, "%s/%s", dir, stripped_filename);
 283
 284         err = opkg_download_cache(url, pkg->local_filename, NULL, NULL);
 285         free(url);
 286
 287         return err;
 288 }
 289
 290 /*
 291  * Downloads file from url, installs in package database, return package name.
 292  */
 293 int opkg_prepare_url_for_install(const char *url, char **namep)
 294 {
 295         int err = 0;
 296         pkg_t *pkg;
 297
 298         pkg = pkg_new();
 299
 300         if (str_starts_with(url, "http://")
 301             || str_starts_with(url, "ftp://")) {
 302                 char *tmp_file;
 303                 char *file_basec = xstrdup(url);
 304                 char *file_base = basename(file_basec);
 305
 306                 sprintf_alloc(&tmp_file, "%s/%s", conf->tmp_dir, file_base);
 307                 err = opkg_download(url, tmp_file, NULL, NULL, 0);
 308                 if (err)
 309                         return err;
 310
 311                 err = pkg_init_from_file(pkg, tmp_file);
 312                 if (err)
 313                         return err;
 314
 315                 free(tmp_file);
 316                 free(file_basec);
 317
 318         } else if (strcmp(&url[strlen(url) - 4], OPKG_PKG_EXTENSION) == 0
 319                    || strcmp(&url[strlen(url) - 4], IPKG_PKG_EXTENSION) == 0
 320                    || strcmp(&url[strlen(url) - 4], DPKG_PKG_EXTENSION) == 0) {
 321
 322                 err = pkg_init_from_file(pkg, url);
 323                 if (err)
 324                         return err;
 325                 opkg_msg(DEBUG2, "Package %s provided by hand (%s).\n",
 326                          pkg->name, pkg->local_filename);
 327                 pkg->provided_by_hand = 1;
 328
 329         } else {
 330                 pkg_deinit(pkg);
 331                 free(pkg);
 332                 return 0;
 333         }
 334
 335         pkg->dest = conf->default_dest;
 336         pkg->state_want = SW_INSTALL;
 337         pkg->state_flag |= SF_PREFER;
 338         hash_insert_pkg(pkg, 1);
 339
 340         if (namep) {
 341                 *namep = xstrdup(pkg->name);
 342         }
 343         return 0;
 344 }
 345
 346 int opkg_verify_file(char *text_file, char *sig_file)
 347 {
 348 #if defined HAVE_USIGN
 349         int status = -1;
 350         int pid;
 351
 352         if (conf->check_signature == 0)
 353                 return 0;
 354
 355         pid = fork();
 356         if (pid < 0)
 357                 return -1;
 358
 359         if (!pid) {
 360                 execl("/usr/sbin/opkg-key", "opkg-key", "verify", sig_file,
 361                       text_file, NULL);
 362                 exit(255);
 363         }
 364
 365         waitpid(pid, &status, 0);
 366         if (!WIFEXITED(status) || WEXITSTATUS(status))
 367                 return -1;
 368
 369         return 0;
 370 #elif defined HAVE_GPGME
 371         if (conf->check_signature == 0)
 372                 return 0;
 373         int status = -1;
 374         gpgme_ctx_t ctx;
 375         gpgme_data_t sig, text, key;
 376         gpgme_error_t err;
 377         gpgme_verify_result_t result;
 378         gpgme_signature_t s;
 379         char *trusted_path = NULL;
 380
 381         gpgme_check_version(NULL);
 382
 383         err = gpgme_new(&ctx);
 384
 385         if (err)
 386                 return -1;
 387
 388         sprintf_alloc(&trusted_path, "%s/%s", conf->offline_root,
 389                       "/etc/opkg/trusted.gpg");
 390         err = gpgme_data_new_from_file(&key, trusted_path, 1);
 391         free(trusted_path);
 392         if (err) {
 393                 return -1;
 394         }
 395         err = gpgme_op_import(ctx, key);
 396         if (err) {
 397                 gpgme_data_release(key);
 398                 return -1;
 399         }
 400         gpgme_data_release(key);
 401
 402         err = gpgme_data_new_from_file(&sig, sig_file, 1);
 403         if (err) {
 404                 gpgme_release(ctx);
 405                 return -1;
 406         }
 407
 408         err = gpgme_data_new_from_file(&text, text_file, 1);
 409         if (err) {
 410                 gpgme_data_release(sig);
 411                 gpgme_release(ctx);
 412                 return -1;
 413         }
 414
 415         err = gpgme_op_verify(ctx, sig, text, NULL);
 416
 417         result = gpgme_op_verify_result(ctx);
 418         if (!result)
 419                 return -1;
 420
 421         /* see if any of the signitures matched */
 422         s = result->signatures;
 423         while (s) {
 424                 status = gpg_err_code(s->status);
 425                 if (status == GPG_ERR_NO_ERROR)
 426                         break;
 427                 s = s->next;
 428         }
 429
 430         gpgme_data_release(sig);
 431         gpgme_data_release(text);
 432         gpgme_release(ctx);
 433
 434         return status;
 435 #elif defined HAVE_OPENSSL
 436         X509_STORE *store = NULL;
 437         PKCS7 *p7 = NULL;
 438         BIO *in = NULL, *indata = NULL;
 439
 440         // Sig check failed by default !
 441         int status = -1;
 442
 443         openssl_init();
 444
 445         // Set-up the key store
 446         if (!
 447             (store =
 448              setup_verify(conf->signature_ca_file, conf->signature_ca_path))) {
 449                 opkg_msg(ERROR, "Can't open CA certificates.\n");
 450                 goto verify_file_end;
 451         }
 452         // Open a BIO to read the sig file
 453         if (!(in = BIO_new_file(sig_file, "rb"))) {
 454                 opkg_msg(ERROR, "Can't open signature file %s.\n", sig_file);
 455                 goto verify_file_end;
 456         }
 457         // Read the PKCS7 block contained in the sig file
 458         p7 = PEM_read_bio_PKCS7(in, NULL, NULL, NULL);
 459         if (!p7) {
 460                 opkg_msg(ERROR, "Can't read signature file %s (Corrupted ?).\n",
 461                          sig_file);
 462                 goto verify_file_end;
 463         }
 464 #if defined(HAVE_PATHFINDER)
 465         if (conf->check_x509_path) {
 466                 if (!pkcs7_pathfinder_verify_signers(p7)) {
 467                         opkg_msg(ERROR, "pkcs7_pathfinder_verify_signers: "
 468                                  "Path verification failed.\n");
 469                         goto verify_file_end;
 470                 }
 471         }
 472 #endif
 473
 474         // Open the Package file to authenticate
 475         if (!(indata = BIO_new_file(text_file, "rb"))) {
 476                 opkg_msg(ERROR, "Can't open file %s.\n", text_file);
 477                 goto verify_file_end;
 478         }
 479         // Let's verify the autenticity !
 480         if (PKCS7_verify(p7, NULL, store, indata, NULL, PKCS7_BINARY) != 1) {
 481                 // Get Off My Lawn!
 482                 opkg_msg(ERROR, "Verification failure.\n");
 483         } else {
 484                 // Victory !
 485                 status = 0;
 486         }
 487
 488 verify_file_end:
 489         BIO_free(in);
 490         BIO_free(indata);
 491         PKCS7_free(p7);
 492         X509_STORE_free(store);
 493
 494         return status;
 495 #else
 496         /* mute `unused variable' warnings. */
 497         (void)sig_file;
 498         (void)text_file;
 499         (void)conf;
 500         return 0;
 501 #endif
 502 }
 503
 504 #if defined(HAVE_OPENSSL) || defined(HAVE_SSLCURL)
 505 static void openssl_init(void)
 506 {
 507         static int init = 0;
 508
 509         if (!init) {
 510                 OPENSSL_config(NULL);
 511                 OpenSSL_add_all_algorithms();
 512                 ERR_load_crypto_strings();
 513                 init = 1;
 514         }
 515 }
 516
 517 #endif
 518
 519 #if defined HAVE_OPENSSL
 520 static X509_STORE *setup_verify(char *CAfile, char *CApath)
 521 {
 522         X509_STORE *store = NULL;
 523         X509_LOOKUP *lookup = NULL;
 524
 525         if (!(store = X509_STORE_new())) {
 526                 // Something bad is happening...
 527                 goto end;
 528         }
 529         // adds the X509 file lookup method
 530         lookup = X509_STORE_add_lookup(store, X509_LOOKUP_file());
 531         if (lookup == NULL) {
 532                 goto end;
 533         }
 534         // Autenticating against one CA file
 535         if (CAfile) {
 536                 if (!X509_LOOKUP_load_file(lookup, CAfile, X509_FILETYPE_PEM)) {
 537                         // Invalid CA => Bye bye
 538                         opkg_msg(ERROR, "Error loading file %s.\n", CAfile);
 539                         goto end;
 540                 }
 541         } else {
 542                 X509_LOOKUP_load_file(lookup, NULL, X509_FILETYPE_DEFAULT);
 543         }
 544
 545         // Now look into CApath directory if supplied
 546         lookup = X509_STORE_add_lookup(store, X509_LOOKUP_hash_dir());
 547         if (lookup == NULL) {
 548                 goto end;
 549         }
 550
 551         if (CApath) {
 552                 if (!X509_LOOKUP_add_dir(lookup, CApath, X509_FILETYPE_PEM)) {
 553                         opkg_msg(ERROR, "Error loading directory %s.\n",
 554                                  CApath);
 555                         goto end;
 556                 }
 557         } else {
 558                 X509_LOOKUP_add_dir(lookup, NULL, X509_FILETYPE_DEFAULT);
 559         }
 560
 561         // All right !
 562         ERR_clear_error();
 563         return store;
 564
 565 end:
 566
 567         X509_STORE_free(store);
 568         return NULL;
 569
 570 }
 571
 572 #endif
 573
 574 #ifdef HAVE_CURL
 575 void opkg_curl_cleanup(void)
 576 {
 577         if (curl != NULL) {
 578                 curl_easy_cleanup(curl);
 579                 curl = NULL;
 580         }
 581 }
 582
 583 static CURL *opkg_curl_init(curl_progress_func cb, void *data)
 584 {
 585
 586         if (curl == NULL) {
 587                 curl = curl_easy_init();
 588
 589 #ifdef HAVE_SSLCURL
 590                 openssl_init();
 591
 592                 if (conf->ssl_engine) {
 593
 594                         /* use crypto engine */
 595                         if (curl_easy_setopt
 596                             (curl, CURLOPT_SSLENGINE,
 597                              conf->ssl_engine) != CURLE_OK) {
 598                                 opkg_msg(ERROR,
 599                                          "Can't set crypto engine '%s'.\n",
 600                                          conf->ssl_engine);
 601
 602                                 opkg_curl_cleanup();
 603                                 return NULL;
 604                         }
 605                         /* set the crypto engine as default */
 606                         if (curl_easy_setopt
 607                             (curl, CURLOPT_SSLENGINE_DEFAULT, 1L) != CURLE_OK) {
 608                                 opkg_msg(ERROR,
 609                                          "Can't set crypto engine '%s' as default.\n",
 610                                          conf->ssl_engine);
 611
 612                                 opkg_curl_cleanup();
 613                                 return NULL;
 614                         }
 615                 }
 616
 617                 /* cert & key can only be in PEM case in the same file */
 618                 if (conf->ssl_key_passwd) {
 619                         if (curl_easy_setopt
 620                             (curl, CURLOPT_SSLKEYPASSWD,
 621                              conf->ssl_key_passwd) != CURLE_OK) {
 622                                 opkg_msg(DEBUG,
 623                                          "Failed to set key password.\n");
 624                         }
 625                 }
 626
 627                 /* sets the client certificate and its type */
 628                 if (conf->ssl_cert_type) {
 629                         if (curl_easy_setopt
 630                             (curl, CURLOPT_SSLCERTTYPE,
 631                              conf->ssl_cert_type) != CURLE_OK) {
 632                                 opkg_msg(DEBUG,
 633                                          "Failed to set certificate format.\n");
 634                         }
 635                 }
 636                 /* SSL cert name isn't mandatory */
 637                 if (conf->ssl_cert) {
 638                         curl_easy_setopt(curl, CURLOPT_SSLCERT, conf->ssl_cert);
 639                 }
 640
 641                 /* sets the client key and its type */
 642                 if (conf->ssl_key_type) {
 643                         if (curl_easy_setopt
 644                             (curl, CURLOPT_SSLKEYTYPE,
 645                              conf->ssl_key_type) != CURLE_OK) {
 646                                 opkg_msg(DEBUG, "Failed to set key format.\n");
 647                         }
 648                 }
 649                 if (conf->ssl_key) {
 650                         if (curl_easy_setopt
 651                             (curl, CURLOPT_SSLKEY, conf->ssl_key) != CURLE_OK) {
 652                                 opkg_msg(DEBUG, "Failed to set key.\n");
 653                         }
 654                 }
 655
 656                 /* Should we verify the peer certificate ? */
 657                 if (conf->ssl_dont_verify_peer) {
 658                         /*
 659                          * CURLOPT_SSL_VERIFYPEER default is nonzero (curl => 7.10)
 660                          */
 661                         curl_easy_setopt(curl, CURLOPT_SSL_VERIFYPEER, 0);
 662                 } else {
 663 #ifdef HAVE_PATHFINDER
 664                         if (conf->check_x509_path) {
 665                                 if (curl_easy_setopt
 666                                     (curl, CURLOPT_SSL_CTX_FUNCTION,
 667                                      curl_ssl_ctx_function) != CURLE_OK) {
 668                                         opkg_msg(DEBUG,
 669                                                  "Failed to set ssl path verification callback.\n");
 670                                 } else {
 671                                         curl_easy_setopt(curl,
 672                                                          CURLOPT_SSL_CTX_DATA,
 673                                                          NULL);
 674                                 }
 675                         }
 676 #endif
 677                 }
 678
 679                 /* certification authority file and/or path */
 680                 if (conf->ssl_ca_file) {
 681                         curl_easy_setopt(curl, CURLOPT_CAINFO,
 682                                          conf->ssl_ca_file);
 683                 }
 684                 if (conf->ssl_ca_path) {
 685                         curl_easy_setopt(curl, CURLOPT_CAPATH,
 686                                          conf->ssl_ca_path);
 687                 }
 688 #endif
 689
 690                 curl_easy_setopt(curl, CURLOPT_FOLLOWLOCATION, 1);
 691                 curl_easy_setopt(curl, CURLOPT_FAILONERROR, 1);
 692                 if (conf->http_proxy || conf->ftp_proxy) {
 693                         char *userpwd;
 694                         sprintf_alloc(&userpwd, "%s:%s", conf->proxy_user,
 695                                       conf->proxy_passwd);
 696                         curl_easy_setopt(curl, CURLOPT_PROXYUSERPWD, userpwd);
 697                         free(userpwd);
 698                 }
 699         }
 700
 701         curl_easy_setopt(curl, CURLOPT_NOPROGRESS, (cb == NULL));
 702         if (cb) {
 703                 curl_easy_setopt(curl, CURLOPT_PROGRESSDATA, data);
 704                 curl_easy_setopt(curl, CURLOPT_PROGRESSFUNCTION, cb);
 705         }
 706
 707         return curl;
 708
 709 }
 710 #endif