http-fetch.c

   1 #include "cache.h"
   2 #include "commit.h"
   3 #include "pack.h"
   4 #include "fetch.h"
   5
   6 #include <curl/curl.h>
   7 #include <curl/easy.h>
   8
   9 #if LIBCURL_VERSION_NUM >= 0x070908
  10 #define USE_CURL_MULTI
  11 #define DEFAULT_MAX_REQUESTS 5
  12 #endif
  13
  14 #if LIBCURL_VERSION_NUM < 0x070704
  15 #define curl_global_cleanup() do { /* nothing */ } while(0)
  16 #endif
  17 #if LIBCURL_VERSION_NUM < 0x070800
  18 #define curl_global_init(a) do { /* nothing */ } while(0)
  19 #endif
  20
  21 #if LIBCURL_VERSION_NUM < 0x070c04
  22 #define NO_CURL_EASY_DUPHANDLE
  23 #endif
  24
  25 #define PREV_BUF_SIZE 4096
  26 #define RANGE_HEADER_SIZE 30
  27
  28 static int got_alternates = -1;
  29 static int active_requests = 0;
  30 static int data_received;
  31
  32 #ifdef USE_CURL_MULTI
  33 static int max_requests = -1;
  34 static CURLM *curlm;
  35 #endif
  36 #ifndef NO_CURL_EASY_DUPHANDLE
  37 static CURL *curl_default;
  38 #endif
  39 static struct curl_slist *pragma_header;
  40 static struct curl_slist *no_pragma_header;
  41 static struct curl_slist *no_range_header;
  42 static char curl_errorstr[CURL_ERROR_SIZE];
  43
  44 struct alt_base
  45 {
  46         char *base;
  47         int got_indices;
  48         struct packed_git *packs;
  49         struct alt_base *next;
  50 };
  51
  52 static struct alt_base *alt = NULL;
  53
  54 enum transfer_state {
  55         WAITING,
  56         ABORTED,
  57         ACTIVE,
  58         COMPLETE,
  59 };
  60
  61 struct transfer_request
  62 {
  63         unsigned char sha1[20];
  64         struct alt_base *repo;
  65         char *url;
  66         char filename[PATH_MAX];
  67         char tmpfile[PATH_MAX];
  68         int local;
  69         enum transfer_state state;
  70         CURLcode curl_result;
  71         char errorstr[CURL_ERROR_SIZE];
  72         long http_code;
  73         unsigned char real_sha1[20];
  74         SHA_CTX c;
  75         z_stream stream;
  76         int zret;
  77         int rename;
  78         struct active_request_slot *slot;
  79         struct transfer_request *next;
  80 };
  81
  82 struct active_request_slot
  83 {
  84         CURL *curl;
  85         FILE *local;
  86         int in_use;
  87         int done;
  88         CURLcode curl_result;
  89         long http_code;
  90         void *callback_data;
  91         void (*callback_func)(void *data);
  92         struct active_request_slot *next;
  93 };
  94
  95 struct alt_request {
  96         char *base;
  97         char *url;
  98         struct buffer *buffer;
  99         struct active_request_slot *slot;
 100         int http_specific;
 101 };
 102
 103 static struct transfer_request *request_queue_head = NULL;
 104 static struct active_request_slot *active_queue_head = NULL;
 105
 106 static int curl_ssl_verify = -1;
 107 static char *ssl_cert = NULL;
 108 #if LIBCURL_VERSION_NUM >= 0x070902
 109 static char *ssl_key = NULL;
 110 #endif
 111 #if LIBCURL_VERSION_NUM >= 0x070908
 112 static char *ssl_capath = NULL;
 113 #endif
 114 static char *ssl_cainfo = NULL;
 115 static long curl_low_speed_limit = -1;
 116 static long curl_low_speed_time = -1;
 117
 118 struct buffer
 119 {
 120         size_t posn;
 121         size_t size;
 122         void *buffer;
 123 };
 124
 125 static int http_options(const char *var, const char *value)
 126 {
 127         if (!strcmp("http.sslverify", var)) {
 128                 if (curl_ssl_verify == -1) {
 129                         curl_ssl_verify = git_config_bool(var, value);
 130                 }
 131                 return 0;
 132         }
 133
 134         if (!strcmp("http.sslcert", var)) {
 135                 if (ssl_cert == NULL) {
 136                         ssl_cert = xmalloc(strlen(value)+1);
 137                         strcpy(ssl_cert, value);
 138                 }
 139                 return 0;
 140         }
 141 #if LIBCURL_VERSION_NUM >= 0x070902
 142         if (!strcmp("http.sslkey", var)) {
 143                 if (ssl_key == NULL) {
 144                         ssl_key = xmalloc(strlen(value)+1);
 145                         strcpy(ssl_key, value);
 146                 }
 147                 return 0;
 148         }
 149 #endif
 150 #if LIBCURL_VERSION_NUM >= 0x070908
 151         if (!strcmp("http.sslcapath", var)) {
 152                 if (ssl_capath == NULL) {
 153                         ssl_capath = xmalloc(strlen(value)+1);
 154                         strcpy(ssl_capath, value);
 155                 }
 156                 return 0;
 157         }
 158 #endif
 159         if (!strcmp("http.sslcainfo", var)) {
 160                 if (ssl_cainfo == NULL) {
 161                         ssl_cainfo = xmalloc(strlen(value)+1);
 162                         strcpy(ssl_cainfo, value);
 163                 }
 164                 return 0;
 165         }
 166
 167 #ifdef USE_CURL_MULTI
 168         if (!strcmp("http.maxrequests", var)) {
 169                 if (max_requests == -1)
 170                         max_requests = git_config_int(var, value);
 171                 return 0;
 172         }
 173 #endif
 174
 175         if (!strcmp("http.lowspeedlimit", var)) {
 176                 if (curl_low_speed_limit == -1)
 177                         curl_low_speed_limit = (long)git_config_int(var, value);
 178                 return 0;
 179         }
 180         if (!strcmp("http.lowspeedtime", var)) {
 181                 if (curl_low_speed_time == -1)
 182                         curl_low_speed_time = (long)git_config_int(var, value);
 183                 return 0;
 184         }
 185
 186         /* Fall back on the default ones */
 187         return git_default_config(var, value);
 188 }
 189
 190 static size_t fwrite_buffer(void *ptr, size_t eltsize, size_t nmemb,
 191                             struct buffer *buffer)
 192 {
 193         size_t size = eltsize * nmemb;
 194         if (size > buffer->size - buffer->posn)
 195                 size = buffer->size - buffer->posn;
 196         memcpy(buffer->buffer + buffer->posn, ptr, size);
 197         buffer->posn += size;
 198         data_received++;
 199         return size;
 200 }
 201
 202 static size_t fwrite_buffer_dynamic(const void *ptr, size_t eltsize,
 203                                     size_t nmemb, struct buffer *buffer)
 204 {
 205         size_t size = eltsize * nmemb;
 206         if (size > buffer->size - buffer->posn) {
 207                 buffer->size = buffer->size * 3 / 2;
 208                 if (buffer->size < buffer->posn + size)
 209                         buffer->size = buffer->posn + size;
 210                 buffer->buffer = xrealloc(buffer->buffer, buffer->size);
 211         }
 212         memcpy(buffer->buffer + buffer->posn, ptr, size);
 213         buffer->posn += size;
 214         data_received++;
 215         return size;
 216 }
 217
 218 static size_t fwrite_sha1_file(void *ptr, size_t eltsize, size_t nmemb,
 219                                void *data)
 220 {
 221         unsigned char expn[4096];
 222         size_t size = eltsize * nmemb;
 223         int posn = 0;
 224         struct transfer_request *request = (struct transfer_request *)data;
 225         do {
 226                 ssize_t retval = write(request->local,
 227                                        ptr + posn, size - posn);
 228                 if (retval < 0)
 229                         return posn;
 230                 posn += retval;
 231         } while (posn < size);
 232
 233         request->stream.avail_in = size;
 234         request->stream.next_in = ptr;
 235         do {
 236                 request->stream.next_out = expn;
 237                 request->stream.avail_out = sizeof(expn);
 238                 request->zret = inflate(&request->stream, Z_SYNC_FLUSH);
 239                 SHA1_Update(&request->c, expn,
 240                             sizeof(expn) - request->stream.avail_out);
 241         } while (request->stream.avail_in && request->zret == Z_OK);
 242         data_received++;
 243         return size;
 244 }
 245
 246 #ifdef USE_CURL_MULTI
 247 static void process_curl_messages(void);
 248 static void process_request_queue(void);
 249 #endif
 250 static void fetch_alternates(char *base);
 251
 252 static CURL* get_curl_handle(void)
 253 {
 254         CURL* result = curl_easy_init();
 255
 256         curl_easy_setopt(result, CURLOPT_SSL_VERIFYPEER, curl_ssl_verify);
 257 #if LIBCURL_VERSION_NUM >= 0x070907
 258         curl_easy_setopt(result, CURLOPT_NETRC, CURL_NETRC_OPTIONAL);
 259 #endif
 260
 261         if (ssl_cert != NULL)
 262                 curl_easy_setopt(result, CURLOPT_SSLCERT, ssl_cert);
 263 #if LIBCURL_VERSION_NUM >= 0x070902
 264         if (ssl_key != NULL)
 265                 curl_easy_setopt(result, CURLOPT_SSLKEY, ssl_key);
 266 #endif
 267 #if LIBCURL_VERSION_NUM >= 0x070908
 268         if (ssl_capath != NULL)
 269                 curl_easy_setopt(result, CURLOPT_CAPATH, ssl_capath);
 270 #endif
 271         if (ssl_cainfo != NULL)
 272                 curl_easy_setopt(result, CURLOPT_CAINFO, ssl_cainfo);
 273         curl_easy_setopt(result, CURLOPT_FAILONERROR, 1);
 274
 275         if (curl_low_speed_limit > 0 && curl_low_speed_time > 0) {
 276                 curl_easy_setopt(result, CURLOPT_LOW_SPEED_LIMIT,
 277                                  curl_low_speed_limit);
 278                 curl_easy_setopt(result, CURLOPT_LOW_SPEED_TIME,
 279                                  curl_low_speed_time);
 280         }
 281
 282         curl_easy_setopt(result, CURLOPT_FOLLOWLOCATION, 1);
 283
 284         return result;
 285 }
 286
 287 static struct active_request_slot *get_active_slot(void)
 288 {
 289         struct active_request_slot *slot = active_queue_head;
 290         struct active_request_slot *newslot;
 291
 292 #ifdef USE_CURL_MULTI
 293         int num_transfers;
 294
 295         /* Wait for a slot to open up if the queue is full */
 296         while (active_requests >= max_requests) {
 297                 curl_multi_perform(curlm, &num_transfers);
 298                 if (num_transfers < active_requests) {
 299                         process_curl_messages();
 300                 }
 301         }
 302 #endif
 303
 304         while (slot != NULL && slot->in_use) {
 305                 slot = slot->next;
 306         }
 307         if (slot == NULL) {
 308                 newslot = xmalloc(sizeof(*newslot));
 309                 newslot->curl = NULL;
 310                 newslot->in_use = 0;
 311                 newslot->next = NULL;
 312
 313                 slot = active_queue_head;
 314                 if (slot == NULL) {
 315                         active_queue_head = newslot;
 316                 } else {
 317                         while (slot->next != NULL) {
 318                                 slot = slot->next;
 319                         }
 320                         slot->next = newslot;
 321                 }
 322                 slot = newslot;
 323         }
 324
 325         if (slot->curl == NULL) {
 326 #ifdef NO_CURL_EASY_DUPHANDLE
 327                 slot->curl = get_curl_handle();
 328 #else
 329                 slot->curl = curl_easy_duphandle(curl_default);
 330 #endif
 331         }
 332
 333         active_requests++;
 334         slot->in_use = 1;
 335         slot->done = 0;
 336         slot->local = NULL;
 337         slot->callback_data = NULL;
 338         slot->callback_func = NULL;
 339         curl_easy_setopt(slot->curl, CURLOPT_HTTPHEADER, pragma_header);
 340         curl_easy_setopt(slot->curl, CURLOPT_HTTPHEADER, no_range_header);
 341         curl_easy_setopt(slot->curl, CURLOPT_ERRORBUFFER, curl_errorstr);
 342
 343         return slot;
 344 }
 345
 346 static int start_active_slot(struct active_request_slot *slot)
 347 {
 348 #ifdef USE_CURL_MULTI
 349         CURLMcode curlm_result = curl_multi_add_handle(curlm, slot->curl);
 350
 351         if (curlm_result != CURLM_OK &&
 352             curlm_result != CURLM_CALL_MULTI_PERFORM) {
 353                 active_requests--;
 354                 slot->in_use = 0;
 355                 return 0;
 356         }
 357 #endif
 358         return 1;
 359 }
 360
 361 static void run_active_slot(struct active_request_slot *slot)
 362 {
 363 #ifdef USE_CURL_MULTI
 364         int num_transfers;
 365         long last_pos = 0;
 366         long current_pos;
 367         fd_set readfds;
 368         fd_set writefds;
 369         fd_set excfds;
 370         int max_fd;
 371         struct timeval select_timeout;
 372         CURLMcode curlm_result;
 373
 374         while (!slot->done) {
 375                 data_received = 0;
 376                 do {
 377                         curlm_result = curl_multi_perform(curlm,
 378                                                           &num_transfers);
 379                 } while (curlm_result == CURLM_CALL_MULTI_PERFORM);
 380                 if (num_transfers < active_requests) {
 381                         process_curl_messages();
 382                         process_request_queue();
 383                 }
 384
 385                 if (!data_received && slot->local != NULL) {
 386                         current_pos = ftell(slot->local);
 387                         if (current_pos > last_pos)
 388                                 data_received++;
 389                         last_pos = current_pos;
 390                 }
 391
 392                 if (!slot->done && !data_received) {
 393                         max_fd = 0;
 394                         FD_ZERO(&readfds);
 395                         FD_ZERO(&writefds);
 396                         FD_ZERO(&excfds);
 397                         select_timeout.tv_sec = 0;
 398                         select_timeout.tv_usec = 50000;
 399                         select(max_fd, &readfds, &writefds,
 400                                &excfds, &select_timeout);
 401                 }
 402         }
 403 #else
 404         slot->curl_result = curl_easy_perform(slot->curl);
 405         active_requests--;
 406 #endif
 407 }
 408
 409 static void start_request(struct transfer_request *request)
 410 {
 411         char *hex = sha1_to_hex(request->sha1);
 412         char prevfile[PATH_MAX];
 413         char *url;
 414         char *posn;
 415         int prevlocal;
 416         unsigned char prev_buf[PREV_BUF_SIZE];
 417         ssize_t prev_read = 0;
 418         long prev_posn = 0;
 419         char range[RANGE_HEADER_SIZE];
 420         struct curl_slist *range_header = NULL;
 421         struct active_request_slot *slot;
 422
 423         snprintf(prevfile, sizeof(prevfile), "%s.prev", request->filename);
 424         unlink(prevfile);
 425         rename(request->tmpfile, prevfile);
 426         unlink(request->tmpfile);
 427
 428         request->local = open(request->tmpfile,
 429                               O_WRONLY | O_CREAT | O_EXCL, 0666);
 430         /* This could have failed due to the "lazy directory creation";
 431          * try to mkdir the last path component.
 432          */
 433         if (request->local < 0 && errno == ENOENT) {
 434                 char *dir = strrchr(request->tmpfile, '/');
 435                 if (dir) {
 436                         *dir = 0;
 437                         mkdir(request->tmpfile, 0777);
 438                         *dir = '/';
 439                 }
 440                 request->local = open(request->tmpfile,
 441                                       O_WRONLY | O_CREAT | O_EXCL, 0666);
 442         }
 443
 444         if (request->local < 0) {
 445                 request->state = ABORTED;
 446                 error("Couldn't create temporary file %s for %s: %s\n",
 447                       request->tmpfile, request->filename, strerror(errno));
 448                 return;
 449         }
 450
 451         memset(&request->stream, 0, sizeof(request->stream));
 452
 453         inflateInit(&request->stream);
 454
 455         SHA1_Init(&request->c);
 456
 457         url = xmalloc(strlen(request->repo->base) + 50);
 458         request->url = xmalloc(strlen(request->repo->base) + 50);
 459         strcpy(url, request->repo->base);
 460         posn = url + strlen(request->repo->base);
 461         strcpy(posn, "objects/");
 462         posn += 8;
 463         memcpy(posn, hex, 2);
 464         posn += 2;
 465         *(posn++) = '/';
 466         strcpy(posn, hex + 2);
 467         strcpy(request->url, url);
 468
 469         /* If a previous temp file is present, process what was already
 470            fetched. */
 471         prevlocal = open(prevfile, O_RDONLY);
 472         if (prevlocal != -1) {
 473                 do {
 474                         prev_read = read(prevlocal, prev_buf, PREV_BUF_SIZE);
 475                         if (prev_read>0) {
 476                                 if (fwrite_sha1_file(prev_buf,
 477                                                      1,
 478                                                      prev_read,
 479                                                      request) == prev_read) {
 480                                         prev_posn += prev_read;
 481                                 } else {
 482                                         prev_read = -1;
 483                                 }
 484                         }
 485                 } while (prev_read > 0);
 486                 close(prevlocal);
 487         }
 488         unlink(prevfile);
 489
 490         /* Reset inflate/SHA1 if there was an error reading the previous temp
 491            file; also rewind to the beginning of the local file. */
 492         if (prev_read == -1) {
 493                 memset(&request->stream, 0, sizeof(request->stream));
 494                 inflateInit(&request->stream);
 495                 SHA1_Init(&request->c);
 496                 if (prev_posn>0) {
 497                         prev_posn = 0;
 498                         lseek(request->local, SEEK_SET, 0);
 499                         ftruncate(request->local, 0);
 500                 }
 501         }
 502
 503         slot = get_active_slot();
 504         curl_easy_setopt(slot->curl, CURLOPT_FILE, request);
 505         curl_easy_setopt(slot->curl, CURLOPT_WRITEFUNCTION, fwrite_sha1_file);
 506         curl_easy_setopt(slot->curl, CURLOPT_ERRORBUFFER, request->errorstr);
 507         curl_easy_setopt(slot->curl, CURLOPT_URL, url);
 508         curl_easy_setopt(slot->curl, CURLOPT_HTTPHEADER, no_pragma_header);
 509
 510         /* If we have successfully processed data from a previous fetch
 511            attempt, only fetch the data we don't already have. */
 512         if (prev_posn>0) {
 513                 if (get_verbosely)
 514                         fprintf(stderr,
 515                                 "Resuming fetch of object %s at byte %ld\n",
 516                                 hex, prev_posn);
 517                 sprintf(range, "Range: bytes=%ld-", prev_posn);
 518                 range_header = curl_slist_append(range_header, range);
 519                 curl_easy_setopt(slot->curl,
 520                                  CURLOPT_HTTPHEADER, range_header);
 521         }
 522
 523         /* Try to get the request started, abort the request on error */
 524         if (!start_active_slot(slot)) {
 525                 request->state = ABORTED;
 526                 close(request->local);
 527                 free(request->url);
 528                 return;
 529         }
 530
 531         request->slot = slot;
 532         request->state = ACTIVE;
 533 }
 534
 535 static void finish_request(struct transfer_request *request)
 536 {
 537         struct stat st;
 538
 539         fchmod(request->local, 0444);
 540         close(request->local);
 541
 542         if (request->http_code == 416) {
 543                 fprintf(stderr, "Warning: requested range invalid; we may already have all the data.\n");
 544         } else if (request->curl_result != CURLE_OK) {
 545                 if (stat(request->tmpfile, &st) == 0)
 546                         if (st.st_size == 0)
 547                                 unlink(request->tmpfile);
 548                 return;
 549         }
 550
 551         inflateEnd(&request->stream);
 552         SHA1_Final(request->real_sha1, &request->c);
 553         if (request->zret != Z_STREAM_END) {
 554                 unlink(request->tmpfile);
 555                 return;
 556         }
 557         if (memcmp(request->sha1, request->real_sha1, 20)) {
 558                 unlink(request->tmpfile);
 559                 return;
 560         }
 561         request->rename =
 562                 move_temp_to_file(request->tmpfile, request->filename);
 563
 564         if (request->rename == 0)
 565                 pull_say("got %s\n", sha1_to_hex(request->sha1));
 566 }
 567
 568 static void release_request(struct transfer_request *request)
 569 {
 570         struct transfer_request *entry = request_queue_head;
 571
 572         if (request == request_queue_head) {
 573                 request_queue_head = request->next;
 574         } else {
 575                 while (entry->next != NULL && entry->next != request)
 576                         entry = entry->next;
 577                 if (entry->next == request)
 578                         entry->next = entry->next->next;
 579         }
 580
 581         free(request->url);
 582         free(request);
 583 }
 584
 585 #ifdef USE_CURL_MULTI
 586 static void process_curl_messages(void)
 587 {
 588         int num_messages;
 589         struct active_request_slot *slot;
 590         struct transfer_request *request = NULL;
 591         CURLMsg *curl_message = curl_multi_info_read(curlm, &num_messages);
 592
 593         while (curl_message != NULL) {
 594                 if (curl_message->msg == CURLMSG_DONE) {
 595                         int curl_result = curl_message->data.result;
 596                         slot = active_queue_head;
 597                         while (slot != NULL &&
 598                                slot->curl != curl_message->easy_handle)
 599                                 slot = slot->next;
 600                         if (slot != NULL) {
 601                                 curl_multi_remove_handle(curlm, slot->curl);
 602                                 active_requests--;
 603                                 slot->done = 1;
 604                                 slot->in_use = 0;
 605                                 slot->curl_result = curl_result;
 606                                 curl_easy_getinfo(slot->curl,
 607                                                   CURLINFO_HTTP_CODE,
 608                                                   &slot->http_code);
 609                                 request = request_queue_head;
 610                                 while (request != NULL &&
 611                                        request->slot != slot)
 612                                         request = request->next;
 613                         } else {
 614                                 fprintf(stderr, "Received DONE message for unknown request!\n");
 615                         }
 616
 617                         /* Process slot callback if appropriate */
 618                         if (slot->callback_func != NULL) {
 619                                 slot->callback_func(slot->callback_data);
 620                         }
 621
 622                         if (request != NULL) {
 623                                 request->curl_result = curl_result;
 624                                 request->http_code = slot->http_code;
 625                                 request->slot = NULL;
 626                                 request->state = COMPLETE;
 627
 628                                 /* Use alternates if necessary */
 629                                 if (request->http_code == 404) {
 630                                         fetch_alternates(alt->base);
 631                                         if (request->repo->next != NULL) {
 632                                                 request->repo =
 633                                                         request->repo->next;
 634                                                 start_request(request);
 635                                         } else {
 636                                                 finish_request(request);
 637                                         }
 638                                 } else {
 639                                         finish_request(request);
 640                                 }
 641                         }
 642                 } else {
 643                         fprintf(stderr, "Unknown CURL message received: %d\n",
 644                                 (int)curl_message->msg);
 645                 }
 646                 curl_message = curl_multi_info_read(curlm, &num_messages);
 647         }
 648 }
 649
 650 static void process_request_queue(void)
 651 {
 652         struct transfer_request *request = request_queue_head;
 653         struct active_request_slot *slot = active_queue_head;
 654         int num_transfers;
 655
 656         while (active_requests < max_requests && request != NULL) {
 657                 if (request->state == WAITING) {
 658                         if (has_sha1_file(request->sha1))
 659                                 release_request(request);
 660                         else
 661                                 start_request(request);
 662                         curl_multi_perform(curlm, &num_transfers);
 663                 }
 664                 request = request->next;
 665         }
 666
 667         while (slot != NULL) {
 668                 if (!slot->in_use && slot->curl != NULL) {
 669                         curl_easy_cleanup(slot->curl);
 670                         slot->curl = NULL;
 671                 }
 672                 slot = slot->next;
 673         }
 674 }
 675 #endif
 676
 677 void prefetch(unsigned char *sha1)
 678 {
 679         struct transfer_request *newreq;
 680         struct transfer_request *tail;
 681         char *filename = sha1_file_name(sha1);
 682
 683         newreq = xmalloc(sizeof(*newreq));
 684         memcpy(newreq->sha1, sha1, 20);
 685         newreq->repo = alt;
 686         newreq->url = NULL;
 687         newreq->local = -1;
 688         newreq->state = WAITING;
 689         snprintf(newreq->filename, sizeof(newreq->filename), "%s", filename);
 690         snprintf(newreq->tmpfile, sizeof(newreq->tmpfile),
 691                  "%s.temp", filename);
 692         newreq->next = NULL;
 693
 694         if (request_queue_head == NULL) {
 695                 request_queue_head = newreq;
 696         } else {
 697                 tail = request_queue_head;
 698                 while (tail->next != NULL) {
 699                         tail = tail->next;
 700                 }
 701                 tail->next = newreq;
 702         }
 703 #ifdef USE_CURL_MULTI
 704         process_request_queue();
 705         process_curl_messages();
 706 #endif
 707 }
 708
 709 static int fetch_index(struct alt_base *repo, unsigned char *sha1)
 710 {
 711         char *hex = sha1_to_hex(sha1);
 712         char *filename;
 713         char *url;
 714         char tmpfile[PATH_MAX];
 715         long prev_posn = 0;
 716         char range[RANGE_HEADER_SIZE];
 717         struct curl_slist *range_header = NULL;
 718
 719         FILE *indexfile;
 720         struct active_request_slot *slot;
 721
 722         if (has_pack_index(sha1))
 723                 return 0;
 724
 725         if (get_verbosely)
 726                 fprintf(stderr, "Getting index for pack %s\n", hex);
 727
 728         url = xmalloc(strlen(repo->base) + 64);
 729         sprintf(url, "%s/objects/pack/pack-%s.idx", repo->base, hex);
 730
 731         filename = sha1_pack_index_name(sha1);
 732         snprintf(tmpfile, sizeof(tmpfile), "%s.temp", filename);
 733         indexfile = fopen(tmpfile, "a");
 734         if (!indexfile)
 735                 return error("Unable to open local file %s for pack index",
 736                              filename);
 737
 738         slot = get_active_slot();
 739         curl_easy_setopt(slot->curl, CURLOPT_FILE, indexfile);
 740         curl_easy_setopt(slot->curl, CURLOPT_WRITEFUNCTION, fwrite);
 741         curl_easy_setopt(slot->curl, CURLOPT_URL, url);
 742         curl_easy_setopt(slot->curl, CURLOPT_HTTPHEADER, no_pragma_header);
 743         slot->local = indexfile;
 744
 745         /* If there is data present from a previous transfer attempt,
 746            resume where it left off */
 747         prev_posn = ftell(indexfile);
 748         if (prev_posn>0) {
 749                 if (get_verbosely)
 750                         fprintf(stderr,
 751                                 "Resuming fetch of index for pack %s at byte %ld\n",
 752                                 hex, prev_posn);
 753                 sprintf(range, "Range: bytes=%ld-", prev_posn);
 754                 range_header = curl_slist_append(range_header, range);
 755                 curl_easy_setopt(slot->curl, CURLOPT_HTTPHEADER, range_header);
 756         }
 757
 758         if (start_active_slot(slot)) {
 759                 run_active_slot(slot);
 760                 if (slot->curl_result != CURLE_OK) {
 761                         fclose(indexfile);
 762                         return error("Unable to get pack index %s\n%s", url,
 763                                      curl_errorstr);
 764                 }
 765         } else {
 766                 return error("Unable to start request");
 767         }
 768
 769         fclose(indexfile);
 770
 771         return move_temp_to_file(tmpfile, filename);
 772 }
 773
 774 static int setup_index(struct alt_base *repo, unsigned char *sha1)
 775 {
 776         struct packed_git *new_pack;
 777         if (has_pack_file(sha1))
 778                 return 0; // don't list this as something we can get
 779
 780         if (fetch_index(repo, sha1))
 781                 return -1;
 782
 783         new_pack = parse_pack_index(sha1);
 784         new_pack->next = repo->packs;
 785         repo->packs = new_pack;
 786         return 0;
 787 }
 788
 789 static void process_alternates(void *callback_data)
 790 {
 791         struct alt_request *alt_req = (struct alt_request *)callback_data;
 792         struct active_request_slot *slot = alt_req->slot;
 793         struct alt_base *tail = alt;
 794         char *base = alt_req->base;
 795         static const char null_byte = '\0';
 796         char *data;
 797         int i = 0;
 798
 799         if (alt_req->http_specific) {
 800                 if (slot->curl_result != CURLE_OK ||
 801                     !alt_req->buffer->posn) {
 802
 803                         /* Try reusing the slot to get non-http alternates */
 804                         alt_req->http_specific = 0;
 805                         sprintf(alt_req->url, "%s/objects/info/alternates",
 806                                 base);
 807                         curl_easy_setopt(slot->curl, CURLOPT_URL,
 808                                          alt_req->url);
 809                         active_requests++;
 810                         slot->in_use = 1;
 811                         slot->done = 0;
 812                         if (start_active_slot(slot)) {
 813                                 return;
 814                         } else {
 815                                 got_alternates = -1;
 816                                 slot->done = 1;
 817                                 return;
 818                         }
 819                 }
 820         } else if (slot->curl_result != CURLE_OK) {
 821                 if (slot->http_code != 404) {
 822                         got_alternates = -1;
 823                         return;
 824                 }
 825         }
 826
 827         fwrite_buffer_dynamic(&null_byte, 1, 1, alt_req->buffer);
 828         alt_req->buffer->posn--;
 829         data = alt_req->buffer->buffer;
 830
 831         while (i < alt_req->buffer->posn) {
 832                 int posn = i;
 833                 while (posn < alt_req->buffer->posn && data[posn] != '\n')
 834                         posn++;
 835                 if (data[posn] == '\n') {
 836                         int okay = 0;
 837                         int serverlen = 0;
 838                         struct alt_base *newalt;
 839                         char *target = NULL;
 840                         if (data[i] == '/') {
 841                                 serverlen = strchr(base + 8, '/') - base;
 842                                 okay = 1;
 843                         } else if (!memcmp(data + i, "../", 3)) {
 844                                 i += 3;
 845                                 serverlen = strlen(base);
 846                                 while (i + 2 < posn &&
 847                                        !memcmp(data + i, "../", 3)) {
 848                                         do {
 849                                                 serverlen--;
 850                                         } while (serverlen &&
 851                                                  base[serverlen - 1] != '/');
 852                                         i += 3;
 853                                 }
 854                                 // If the server got removed, give up.
 855                                 okay = strchr(base, ':') - base + 3 <
 856                                         serverlen;
 857                         } else if (alt_req->http_specific) {
 858                                 char *colon = strchr(data + i, ':');
 859                                 char *slash = strchr(data + i, '/');
 860                                 if (colon && slash && colon < data + posn &&
 861                                     slash < data + posn && colon < slash) {
 862                                         okay = 1;
 863                                 }
 864                         }
 865                         // skip 'objects' at end
 866                         if (okay) {
 867                                 target = xmalloc(serverlen + posn - i - 6);
 868                                 strncpy(target, base, serverlen);
 869                                 strncpy(target + serverlen, data + i,
 870                                         posn - i - 7);
 871                                 target[serverlen + posn - i - 7] = '\0';
 872                                 if (get_verbosely)
 873                                         fprintf(stderr,
 874                                                 "Also look at %s\n", target);
 875                                 newalt = xmalloc(sizeof(*newalt));
 876                                 newalt->next = NULL;
 877                                 newalt->base = target;
 878                                 newalt->got_indices = 0;
 879                                 newalt->packs = NULL;
 880                                 while (tail->next != NULL)
 881                                         tail = tail->next;
 882                                 tail->next = newalt;
 883                         }
 884                 }
 885                 i = posn + 1;
 886         }
 887
 888         got_alternates = 1;
 889 }
 890
 891 static void fetch_alternates(char *base)
 892 {
 893         struct buffer buffer;
 894         char *url;
 895         char *data;
 896         struct active_request_slot *slot;
 897         static struct alt_request alt_req;
 898         int num_transfers;
 899
 900         /* If another request has already started fetching alternates,
 901            wait for them to arrive and return to processing this request's
 902            curl message */
 903         while (got_alternates == 0) {
 904                 curl_multi_perform(curlm, &num_transfers);
 905                 process_curl_messages();
 906                 process_request_queue();
 907         }
 908
 909         /* Nothing to do if they've already been fetched */
 910         if (got_alternates == 1)
 911                 return;
 912
 913         /* Start the fetch */
 914         got_alternates = 0;
 915
 916         data = xmalloc(4096);
 917         buffer.size = 4096;
 918         buffer.posn = 0;
 919         buffer.buffer = data;
 920
 921         if (get_verbosely)
 922                 fprintf(stderr, "Getting alternates list for %s\n", base);
 923
 924         url = xmalloc(strlen(base) + 31);
 925         sprintf(url, "%s/objects/info/http-alternates", base);
 926
 927         /* Use a callback to process the result, since another request
 928            may fail and need to have alternates loaded before continuing */
 929         slot = get_active_slot();
 930         slot->callback_func = process_alternates;
 931         slot->callback_data = &alt_req;
 932
 933         curl_easy_setopt(slot->curl, CURLOPT_FILE, &buffer);
 934         curl_easy_setopt(slot->curl, CURLOPT_WRITEFUNCTION,
 935                          fwrite_buffer_dynamic);
 936         curl_easy_setopt(slot->curl, CURLOPT_URL, url);
 937
 938         alt_req.base = base;
 939         alt_req.url = url;
 940         alt_req.buffer = &buffer;
 941         alt_req.http_specific = 1;
 942         alt_req.slot = slot;
 943
 944         if (start_active_slot(slot))
 945                 run_active_slot(slot);
 946         else
 947                 got_alternates = -1;
 948
 949         free(data);
 950         free(url);
 951 }
 952
 953 static int fetch_indices(struct alt_base *repo)
 954 {
 955         unsigned char sha1[20];
 956         char *url;
 957         struct buffer buffer;
 958         char *data;
 959         int i = 0;
 960
 961         struct active_request_slot *slot;
 962
 963         if (repo->got_indices)
 964                 return 0;
 965
 966         data = xmalloc(4096);
 967         buffer.size = 4096;
 968         buffer.posn = 0;
 969         buffer.buffer = data;
 970
 971         if (get_verbosely)
 972                 fprintf(stderr, "Getting pack list for %s\n", repo->base);
 973
 974         url = xmalloc(strlen(repo->base) + 21);
 975         sprintf(url, "%s/objects/info/packs", repo->base);
 976
 977         slot = get_active_slot();
 978         curl_easy_setopt(slot->curl, CURLOPT_FILE, &buffer);
 979         curl_easy_setopt(slot->curl, CURLOPT_WRITEFUNCTION,
 980                          fwrite_buffer_dynamic);
 981         curl_easy_setopt(slot->curl, CURLOPT_URL, url);
 982         curl_easy_setopt(slot->curl, CURLOPT_HTTPHEADER, NULL);
 983         if (start_active_slot(slot)) {
 984                 run_active_slot(slot);
 985                 if (slot->curl_result != CURLE_OK) {
 986                         free(buffer.buffer);
 987                         return error("%s", curl_errorstr);
 988                 }
 989         } else {
 990                 free(buffer.buffer);
 991                 return error("Unable to start request");
 992         }
 993
 994         data = buffer.buffer;
 995         while (i < buffer.posn) {
 996                 switch (data[i]) {
 997                 case 'P':
 998                         i++;
 999                         if (i + 52 < buffer.posn &&
1000                             !strncmp(data + i, " pack-", 6) &&
1001                             !strncmp(data + i + 46, ".pack\n", 6)) {
1002                                 get_sha1_hex(data + i + 6, sha1);
1003                                 setup_index(repo, sha1);
1004                                 i += 51;
1005                                 break;
1006                         }
1007                 default:
1008                         while (data[i] != '\n')
1009                                 i++;
1010                 }
1011                 i++;
1012         }
1013
1014         free(buffer.buffer);
1015         repo->got_indices = 1;
1016         return 0;
1017 }
1018
1019 static int fetch_pack(struct alt_base *repo, unsigned char *sha1)
1020 {
1021         char *url;
1022         struct packed_git *target;
1023         struct packed_git **lst;
1024         FILE *packfile;
1025         char *filename;
1026         char tmpfile[PATH_MAX];
1027         int ret;
1028         long prev_posn = 0;
1029         char range[RANGE_HEADER_SIZE];
1030         struct curl_slist *range_header = NULL;
1031
1032         struct active_request_slot *slot;
1033
1034         if (fetch_indices(repo))
1035                 return -1;
1036         target = find_sha1_pack(sha1, repo->packs);
1037         if (!target)
1038                 return -1;
1039
1040         if (get_verbosely) {
1041                 fprintf(stderr, "Getting pack %s\n",
1042                         sha1_to_hex(target->sha1));
1043                 fprintf(stderr, " which contains %s\n",
1044                         sha1_to_hex(sha1));
1045         }
1046
1047         url = xmalloc(strlen(repo->base) + 65);
1048         sprintf(url, "%s/objects/pack/pack-%s.pack",
1049                 repo->base, sha1_to_hex(target->sha1));
1050
1051         filename = sha1_pack_name(target->sha1);
1052         snprintf(tmpfile, sizeof(tmpfile), "%s.temp", filename);
1053         packfile = fopen(tmpfile, "a");
1054         if (!packfile)
1055                 return error("Unable to open local file %s for pack",
1056                              filename);
1057
1058         slot = get_active_slot();
1059         curl_easy_setopt(slot->curl, CURLOPT_FILE, packfile);
1060         curl_easy_setopt(slot->curl, CURLOPT_WRITEFUNCTION, fwrite);
1061         curl_easy_setopt(slot->curl, CURLOPT_URL, url);
1062         curl_easy_setopt(slot->curl, CURLOPT_HTTPHEADER, no_pragma_header);
1063         slot->local = packfile;
1064
1065         /* If there is data present from a previous transfer attempt,
1066            resume where it left off */
1067         prev_posn = ftell(packfile);
1068         if (prev_posn>0) {
1069                 if (get_verbosely)
1070                         fprintf(stderr,
1071                                 "Resuming fetch of pack %s at byte %ld\n",
1072                                 sha1_to_hex(target->sha1), prev_posn);
1073                 sprintf(range, "Range: bytes=%ld-", prev_posn);
1074                 range_header = curl_slist_append(range_header, range);
1075                 curl_easy_setopt(slot->curl, CURLOPT_HTTPHEADER, range_header);
1076         }
1077
1078         if (start_active_slot(slot)) {
1079                 run_active_slot(slot);
1080                 if (slot->curl_result != CURLE_OK) {
1081                         fclose(packfile);
1082                         return error("Unable to get pack file %s\n%s", url,
1083                                      curl_errorstr);
1084                 }
1085         } else {
1086                 return error("Unable to start request");
1087         }
1088
1089         fclose(packfile);
1090
1091         ret = move_temp_to_file(tmpfile, filename);
1092         if (ret)
1093                 return ret;
1094
1095         lst = &repo->packs;
1096         while (*lst != target)
1097                 lst = &((*lst)->next);
1098         *lst = (*lst)->next;
1099
1100         if (verify_pack(target, 0))
1101                 return -1;
1102         install_packed_git(target);
1103
1104         return 0;
1105 }
1106
1107 static int fetch_object(struct alt_base *repo, unsigned char *sha1)
1108 {
1109         char *hex = sha1_to_hex(sha1);
1110         int ret;
1111         struct transfer_request *request = request_queue_head;
1112
1113         while (request != NULL && memcmp(request->sha1, sha1, 20))
1114                 request = request->next;
1115         if (request == NULL)
1116                 return error("Couldn't find request for %s in the queue", hex);
1117
1118         if (has_sha1_file(request->sha1)) {
1119                 release_request(request);
1120                 return 0;
1121         }
1122
1123 #ifdef USE_CURL_MULTI
1124         while (request->state == WAITING) {
1125                 int num_transfers;
1126                 curl_multi_perform(curlm, &num_transfers);
1127                 if (num_transfers < active_requests) {
1128                         process_curl_messages();
1129                         process_request_queue();
1130                 }
1131         }
1132 #else
1133         start_request(request);
1134 #endif
1135
1136         while (request->state == ACTIVE) {
1137                 run_active_slot(request->slot);
1138 #ifndef USE_CURL_MULTI
1139                 request->curl_result = request->slot->curl_result;
1140                 request->http_code = request->slot->http_code;
1141                 request->slot = NULL;
1142
1143                 /* Use alternates if necessary */
1144                 if (request->http_code == 404) {
1145                         fetch_alternates(alt->base);
1146                         if (request->repo->next != NULL) {
1147                                 request->repo = request->repo->next;
1148                                 start_request(request);
1149                         }
1150                 } else {
1151                         finish_request(request);
1152                         request->state = COMPLETE;
1153                 }
1154 #endif
1155         }
1156
1157         if (request->state == ABORTED) {
1158                 release_request(request);
1159                 return error("Request for %s aborted", hex);
1160         }
1161
1162         if (request->curl_result != CURLE_OK && request->http_code != 416) {
1163                 if (request->http_code == 404)
1164                         ret = -1; /* Be silent, it is probably in a pack. */
1165                 else
1166                         ret = error("%s (curl_result = %d, http_code = %ld, sha1 = %s)",
1167                                     request->errorstr, request->curl_result,
1168                                     request->http_code, hex);
1169                 release_request(request);
1170                 return ret;
1171         }
1172
1173         if (request->zret != Z_STREAM_END) {
1174                 ret = error("File %s (%s) corrupt\n", hex, request->url);
1175                 release_request(request);
1176                 return ret;
1177         }
1178
1179         if (memcmp(request->sha1, request->real_sha1, 20)) {
1180                 release_request(request);
1181                 return error("File %s has bad hash\n", hex);
1182         }
1183
1184         if (request->rename < 0) {
1185                 ret = error("unable to write sha1 filename %s: %s",
1186                             request->filename,
1187                             strerror(request->rename));
1188                 release_request(request);
1189                 return ret;
1190         }
1191
1192         release_request(request);
1193         return 0;
1194 }
1195
1196 int fetch(unsigned char *sha1)
1197 {
1198         struct alt_base *altbase = alt;
1199
1200         if (!fetch_object(altbase, sha1))
1201                 return 0;
1202         while (altbase) {
1203                 if (!fetch_pack(altbase, sha1))
1204                         return 0;
1205                 fetch_alternates(alt->base);
1206                 altbase = altbase->next;
1207         }
1208         return error("Unable to find %s under %s\n", sha1_to_hex(sha1),
1209                      alt->base);
1210 }
1211
1212 static inline int needs_quote(int ch)
1213 {
1214         switch (ch) {
1215         case '/': case '-': case '.':
1216         case 'A'...'Z': case 'a'...'z': case '0'...'9':
1217                 return 0;
1218         default:
1219                 return 1;
1220         }
1221 }
1222
1223 static inline int hex(int v)
1224 {
1225         if (v < 10) return '0' + v;
1226         else return 'A' + v - 10;
1227 }
1228
1229 static char *quote_ref_url(const char *base, const char *ref)
1230 {
1231         const char *cp;
1232         char *dp, *qref;
1233         int len, baselen, ch;
1234
1235         baselen = strlen(base);
1236         len = baselen + 6; /* "refs/" + NUL */
1237         for (cp = ref; (ch = *cp) != 0; cp++, len++)
1238                 if (needs_quote(ch))
1239                         len += 2; /* extra two hex plus replacement % */
1240         qref = xmalloc(len);
1241         memcpy(qref, base, baselen);
1242         memcpy(qref + baselen, "refs/", 5);
1243         for (cp = ref, dp = qref + baselen + 5; (ch = *cp) != 0; cp++) {
1244                 if (needs_quote(ch)) {
1245                         *dp++ = '%';
1246                         *dp++ = hex((ch >> 4) & 0xF);
1247                         *dp++ = hex(ch & 0xF);
1248                 }
1249                 else
1250                         *dp++ = ch;
1251         }
1252         *dp = 0;
1253
1254         return qref;
1255 }
1256
1257 int fetch_ref(char *ref, unsigned char *sha1)
1258 {
1259         char *url;
1260         char hex[42];
1261         struct buffer buffer;
1262         char *base = alt->base;
1263         struct active_request_slot *slot;
1264         buffer.size = 41;
1265         buffer.posn = 0;
1266         buffer.buffer = hex;
1267         hex[41] = '\0';
1268
1269         url = quote_ref_url(base, ref);
1270         slot = get_active_slot();
1271         curl_easy_setopt(slot->curl, CURLOPT_FILE, &buffer);
1272         curl_easy_setopt(slot->curl, CURLOPT_WRITEFUNCTION, fwrite_buffer);
1273         curl_easy_setopt(slot->curl, CURLOPT_HTTPHEADER, NULL);
1274         curl_easy_setopt(slot->curl, CURLOPT_URL, url);
1275         if (start_active_slot(slot)) {
1276                 run_active_slot(slot);
1277                 if (slot->curl_result != CURLE_OK)
1278                         return error("Couldn't get %s for %s\n%s",
1279                                      url, ref, curl_errorstr);
1280         } else {
1281                 return error("Unable to start request");
1282         }
1283
1284         hex[40] = '\0';
1285         get_sha1_hex(hex, sha1);
1286         return 0;
1287 }
1288
1289 int main(int argc, char **argv)
1290 {
1291         char *commit_id;
1292         char *url;
1293         int arg = 1;
1294         struct active_request_slot *slot;
1295         char *low_speed_limit;
1296         char *low_speed_time;
1297         char *wait_url;
1298         int rc = 0;
1299
1300         while (arg < argc && argv[arg][0] == '-') {
1301                 if (argv[arg][1] == 't') {
1302                         get_tree = 1;
1303                 } else if (argv[arg][1] == 'c') {
1304                         get_history = 1;
1305                 } else if (argv[arg][1] == 'a') {
1306                         get_all = 1;
1307                         get_tree = 1;
1308                         get_history = 1;
1309                 } else if (argv[arg][1] == 'v') {
1310                         get_verbosely = 1;
1311                 } else if (argv[arg][1] == 'w') {
1312                         write_ref = argv[arg + 1];
1313                         arg++;
1314                 } else if (!strcmp(argv[arg], "--recover")) {
1315                         get_recover = 1;
1316                 }
1317                 arg++;
1318         }
1319         if (argc < arg + 2) {
1320                 usage("git-http-fetch [-c] [-t] [-a] [-d] [-v] [--recover] [-w ref] commit-id url");
1321                 return 1;
1322         }
1323         commit_id = argv[arg];
1324         url = argv[arg + 1];
1325
1326         curl_global_init(CURL_GLOBAL_ALL);
1327
1328 #ifdef USE_CURL_MULTI
1329         {
1330                 char *http_max_requests = getenv("GIT_HTTP_MAX_REQUESTS");
1331                 if (http_max_requests != NULL)
1332                         max_requests = atoi(http_max_requests);
1333         }
1334
1335         curlm = curl_multi_init();
1336         if (curlm == NULL) {
1337                 fprintf(stderr, "Error creating curl multi handle.\n");
1338                 return 1;
1339         }
1340 #endif
1341
1342         if (getenv("GIT_SSL_NO_VERIFY"))
1343                 curl_ssl_verify = 0;
1344
1345         ssl_cert = getenv("GIT_SSL_CERT");
1346 #if LIBCURL_VERSION_NUM >= 0x070902
1347         ssl_key = getenv("GIT_SSL_KEY");
1348 #endif
1349 #if LIBCURL_VERSION_NUM >= 0x070908
1350         ssl_capath = getenv("GIT_SSL_CAPATH");
1351 #endif
1352         ssl_cainfo = getenv("GIT_SSL_CAINFO");
1353
1354         low_speed_limit = getenv("GIT_HTTP_LOW_SPEED_LIMIT");
1355         if (low_speed_limit != NULL)
1356                 curl_low_speed_limit = strtol(low_speed_limit, NULL, 10);
1357         low_speed_time = getenv("GIT_HTTP_LOW_SPEED_TIME");
1358         if (low_speed_time != NULL)
1359                 curl_low_speed_time = strtol(low_speed_time, NULL, 10);
1360
1361         git_config(http_options);
1362
1363         if (curl_ssl_verify == -1)
1364                 curl_ssl_verify = 1;
1365
1366 #ifdef USE_CURL_MULTI
1367         if (max_requests < 1)
1368                 max_requests = DEFAULT_MAX_REQUESTS;
1369 #endif
1370
1371         pragma_header = curl_slist_append(pragma_header, "Pragma: no-cache");
1372         no_pragma_header = curl_slist_append(no_pragma_header, "Pragma:");
1373         no_range_header = curl_slist_append(no_range_header, "Range:");
1374
1375 #ifndef NO_CURL_EASY_DUPHANDLE
1376         curl_default = get_curl_handle();
1377 #endif
1378
1379         alt = xmalloc(sizeof(*alt));
1380         alt->base = url;
1381         alt->got_indices = 0;
1382         alt->packs = NULL;
1383         alt->next = NULL;
1384
1385         if (pull(commit_id))
1386                 rc = 1;
1387
1388         curl_slist_free_all(pragma_header);
1389         curl_slist_free_all(no_pragma_header);
1390         curl_slist_free_all(no_range_header);
1391 #ifndef NO_CURL_EASY_DUPHANDLE
1392         curl_easy_cleanup(curl_default);
1393 #endif
1394         slot = active_queue_head;
1395         while (slot != NULL) {
1396                 if (slot->in_use) {
1397                         if (get_verbosely) {
1398                                 curl_easy_getinfo(slot->curl,
1399                                                   CURLINFO_EFFECTIVE_URL,
1400                                                   &wait_url);
1401                                 fprintf(stderr, "Waiting for %s\n", wait_url);
1402                         }
1403                         run_active_slot(slot);
1404                 }
1405                 if (slot->curl != NULL)
1406                         curl_easy_cleanup(slot->curl);
1407                 slot = slot->next;
1408         }
1409 #ifdef USE_CURL_MULTI
1410         curl_multi_cleanup(curlm);
1411 #endif
1412         curl_global_cleanup();
1413         return rc;
1414 }