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                                         }
 636                                 } else {
 637                                         finish_request(request);
 638                                 }
 639                         }
 640                 } else {
 641                         fprintf(stderr, "Unknown CURL message received: %d\n",
 642                                 (int)curl_message->msg);
 643                 }
 644                 curl_message = curl_multi_info_read(curlm, &num_messages);
 645         }
 646 }
 647
 648 static void process_request_queue(void)
 649 {
 650         struct transfer_request *request = request_queue_head;
 651         struct active_request_slot *slot = active_queue_head;
 652         int num_transfers;
 653
 654         while (active_requests < max_requests && request != NULL) {
 655                 if (request->state == WAITING) {
 656                         if (has_sha1_file(request->sha1))
 657                                 release_request(request);
 658                         else
 659                                 start_request(request);
 660                         curl_multi_perform(curlm, &num_transfers);
 661                 }
 662                 request = request->next;
 663         }
 664
 665         while (slot != NULL) {
 666                 if (!slot->in_use && slot->curl != NULL) {
 667                         curl_easy_cleanup(slot->curl);
 668                         slot->curl = NULL;
 669                 }
 670                 slot = slot->next;
 671         }
 672 }
 673 #endif
 674
 675 void prefetch(unsigned char *sha1)
 676 {
 677         struct transfer_request *newreq;
 678         struct transfer_request *tail;
 679         char *filename = sha1_file_name(sha1);
 680
 681         newreq = xmalloc(sizeof(*newreq));
 682         memcpy(newreq->sha1, sha1, 20);
 683         newreq->repo = alt;
 684         newreq->url = NULL;
 685         newreq->local = -1;
 686         newreq->state = WAITING;
 687         snprintf(newreq->filename, sizeof(newreq->filename), "%s", filename);
 688         snprintf(newreq->tmpfile, sizeof(newreq->tmpfile),
 689                  "%s.temp", filename);
 690         newreq->next = NULL;
 691
 692         if (request_queue_head == NULL) {
 693                 request_queue_head = newreq;
 694         } else {
 695                 tail = request_queue_head;
 696                 while (tail->next != NULL) {
 697                         tail = tail->next;
 698                 }
 699                 tail->next = newreq;
 700         }
 701 #ifdef USE_CURL_MULTI
 702         process_request_queue();
 703         process_curl_messages();
 704 #endif
 705 }
 706
 707 static int fetch_index(struct alt_base *repo, unsigned char *sha1)
 708 {
 709         char *hex = sha1_to_hex(sha1);
 710         char *filename;
 711         char *url;
 712         char tmpfile[PATH_MAX];
 713         long prev_posn = 0;
 714         char range[RANGE_HEADER_SIZE];
 715         struct curl_slist *range_header = NULL;
 716
 717         FILE *indexfile;
 718         struct active_request_slot *slot;
 719
 720         if (has_pack_index(sha1))
 721                 return 0;
 722
 723         if (get_verbosely)
 724                 fprintf(stderr, "Getting index for pack %s\n", hex);
 725
 726         url = xmalloc(strlen(repo->base) + 64);
 727         sprintf(url, "%s/objects/pack/pack-%s.idx", repo->base, hex);
 728
 729         filename = sha1_pack_index_name(sha1);
 730         snprintf(tmpfile, sizeof(tmpfile), "%s.temp", filename);
 731         indexfile = fopen(tmpfile, "a");
 732         if (!indexfile)
 733                 return error("Unable to open local file %s for pack index",
 734                              filename);
 735
 736         slot = get_active_slot();
 737         curl_easy_setopt(slot->curl, CURLOPT_FILE, indexfile);
 738         curl_easy_setopt(slot->curl, CURLOPT_WRITEFUNCTION, fwrite);
 739         curl_easy_setopt(slot->curl, CURLOPT_URL, url);
 740         curl_easy_setopt(slot->curl, CURLOPT_HTTPHEADER, no_pragma_header);
 741         slot->local = indexfile;
 742
 743         /* If there is data present from a previous transfer attempt,
 744            resume where it left off */
 745         prev_posn = ftell(indexfile);
 746         if (prev_posn>0) {
 747                 if (get_verbosely)
 748                         fprintf(stderr,
 749                                 "Resuming fetch of index for pack %s at byte %ld\n",
 750                                 hex, prev_posn);
 751                 sprintf(range, "Range: bytes=%ld-", prev_posn);
 752                 range_header = curl_slist_append(range_header, range);
 753                 curl_easy_setopt(slot->curl, CURLOPT_HTTPHEADER, range_header);
 754         }
 755
 756         if (start_active_slot(slot)) {
 757                 run_active_slot(slot);
 758                 if (slot->curl_result != CURLE_OK) {
 759                         fclose(indexfile);
 760                         return error("Unable to get pack index %s\n%s", url,
 761                                      curl_errorstr);
 762                 }
 763         } else {
 764                 return error("Unable to start request");
 765         }
 766
 767         fclose(indexfile);
 768
 769         return move_temp_to_file(tmpfile, filename);
 770 }
 771
 772 static int setup_index(struct alt_base *repo, unsigned char *sha1)
 773 {
 774         struct packed_git *new_pack;
 775         if (has_pack_file(sha1))
 776                 return 0; // don't list this as something we can get
 777
 778         if (fetch_index(repo, sha1))
 779                 return -1;
 780
 781         new_pack = parse_pack_index(sha1);
 782         new_pack->next = repo->packs;
 783         repo->packs = new_pack;
 784         return 0;
 785 }
 786
 787 static void process_alternates(void *callback_data)
 788 {
 789         struct alt_request *alt_req = (struct alt_request *)callback_data;
 790         struct active_request_slot *slot = alt_req->slot;
 791         struct alt_base *tail = alt;
 792         char *base = alt_req->base;
 793         static const char null_byte = '\0';
 794         char *data;
 795         int i = 0;
 796
 797         if (alt_req->http_specific) {
 798                 if (slot->curl_result != CURLE_OK ||
 799                     !alt_req->buffer->posn) {
 800
 801                         /* Try reusing the slot to get non-http alternates */
 802                         alt_req->http_specific = 0;
 803                         sprintf(alt_req->url, "%s/objects/info/alternates",
 804                                 base);
 805                         curl_easy_setopt(slot->curl, CURLOPT_URL,
 806                                          alt_req->url);
 807                         active_requests++;
 808                         slot->in_use = 1;
 809                         slot->done = 0;
 810                         if (start_active_slot(slot)) {
 811                                 return;
 812                         } else {
 813                                 got_alternates = -1;
 814                                 slot->done = 1;
 815                                 return;
 816                         }
 817                 }
 818         } else if (slot->curl_result != CURLE_OK) {
 819                 if (slot->http_code != 404) {
 820                         got_alternates = -1;
 821                         return;
 822                 }
 823         }
 824
 825         fwrite_buffer_dynamic(&null_byte, 1, 1, alt_req->buffer);
 826         alt_req->buffer->posn--;
 827         data = alt_req->buffer->buffer;
 828
 829         while (i < alt_req->buffer->posn) {
 830                 int posn = i;
 831                 while (posn < alt_req->buffer->posn && data[posn] != '\n')
 832                         posn++;
 833                 if (data[posn] == '\n') {
 834                         int okay = 0;
 835                         int serverlen = 0;
 836                         struct alt_base *newalt;
 837                         char *target = NULL;
 838                         if (data[i] == '/') {
 839                                 serverlen = strchr(base + 8, '/') - base;
 840                                 okay = 1;
 841                         } else if (!memcmp(data + i, "../", 3)) {
 842                                 i += 3;
 843                                 serverlen = strlen(base);
 844                                 while (i + 2 < posn &&
 845                                        !memcmp(data + i, "../", 3)) {
 846                                         do {
 847                                                 serverlen--;
 848                                         } while (serverlen &&
 849                                                  base[serverlen - 1] != '/');
 850                                         i += 3;
 851                                 }
 852                                 // If the server got removed, give up.
 853                                 okay = strchr(base, ':') - base + 3 <
 854                                         serverlen;
 855                         } else if (alt_req->http_specific) {
 856                                 char *colon = strchr(data + i, ':');
 857                                 char *slash = strchr(data + i, '/');
 858                                 if (colon && slash && colon < data + posn &&
 859                                     slash < data + posn && colon < slash) {
 860                                         okay = 1;
 861                                 }
 862                         }
 863                         // skip 'objects' at end
 864                         if (okay) {
 865                                 target = xmalloc(serverlen + posn - i - 6);
 866                                 strncpy(target, base, serverlen);
 867                                 strncpy(target + serverlen, data + i,
 868                                         posn - i - 7);
 869                                 target[serverlen + posn - i - 7] = '\0';
 870                                 if (get_verbosely)
 871                                         fprintf(stderr,
 872                                                 "Also look at %s\n", target);
 873                                 newalt = xmalloc(sizeof(*newalt));
 874                                 newalt->next = NULL;
 875                                 newalt->base = target;
 876                                 newalt->got_indices = 0;
 877                                 newalt->packs = NULL;
 878                                 while (tail->next != NULL)
 879                                         tail = tail->next;
 880                                 tail->next = newalt;
 881                         }
 882                 }
 883                 i = posn + 1;
 884         }
 885
 886         got_alternates = 1;
 887 }
 888
 889 static void fetch_alternates(char *base)
 890 {
 891         struct buffer buffer;
 892         char *url;
 893         char *data;
 894         struct active_request_slot *slot;
 895         static struct alt_request alt_req;
 896         int num_transfers;
 897
 898         /* If another request has already started fetching alternates,
 899            wait for them to arrive and return to processing this request's
 900            curl message */
 901         while (got_alternates == 0) {
 902                 curl_multi_perform(curlm, &num_transfers);
 903                 process_curl_messages();
 904                 process_request_queue();
 905         }
 906
 907         /* Nothing to do if they've already been fetched */
 908         if (got_alternates == 1)
 909                 return;
 910
 911         /* Start the fetch */
 912         got_alternates = 0;
 913
 914         data = xmalloc(4096);
 915         buffer.size = 4096;
 916         buffer.posn = 0;
 917         buffer.buffer = data;
 918
 919         if (get_verbosely)
 920                 fprintf(stderr, "Getting alternates list for %s\n", base);
 921
 922         url = xmalloc(strlen(base) + 31);
 923         sprintf(url, "%s/objects/info/http-alternates", base);
 924
 925         /* Use a callback to process the result, since another request
 926            may fail and need to have alternates loaded before continuing */
 927         slot = get_active_slot();
 928         slot->callback_func = process_alternates;
 929         slot->callback_data = &alt_req;
 930
 931         curl_easy_setopt(slot->curl, CURLOPT_FILE, &buffer);
 932         curl_easy_setopt(slot->curl, CURLOPT_WRITEFUNCTION,
 933                          fwrite_buffer_dynamic);
 934         curl_easy_setopt(slot->curl, CURLOPT_URL, url);
 935
 936         alt_req.base = base;
 937         alt_req.url = url;
 938         alt_req.buffer = &buffer;
 939         alt_req.http_specific = 1;
 940         alt_req.slot = slot;
 941
 942         if (start_active_slot(slot))
 943                 run_active_slot(slot);
 944         else
 945                 got_alternates = -1;
 946
 947         free(data);
 948         free(url);
 949 }
 950
 951 static int fetch_indices(struct alt_base *repo)
 952 {
 953         unsigned char sha1[20];
 954         char *url;
 955         struct buffer buffer;
 956         char *data;
 957         int i = 0;
 958
 959         struct active_request_slot *slot;
 960
 961         if (repo->got_indices)
 962                 return 0;
 963
 964         data = xmalloc(4096);
 965         buffer.size = 4096;
 966         buffer.posn = 0;
 967         buffer.buffer = data;
 968
 969         if (get_verbosely)
 970                 fprintf(stderr, "Getting pack list for %s\n", repo->base);
 971
 972         url = xmalloc(strlen(repo->base) + 21);
 973         sprintf(url, "%s/objects/info/packs", repo->base);
 974
 975         slot = get_active_slot();
 976         curl_easy_setopt(slot->curl, CURLOPT_FILE, &buffer);
 977         curl_easy_setopt(slot->curl, CURLOPT_WRITEFUNCTION,
 978                          fwrite_buffer_dynamic);
 979         curl_easy_setopt(slot->curl, CURLOPT_URL, url);
 980         curl_easy_setopt(slot->curl, CURLOPT_HTTPHEADER, NULL);
 981         if (start_active_slot(slot)) {
 982                 run_active_slot(slot);
 983                 if (slot->curl_result != CURLE_OK) {
 984                         free(buffer.buffer);
 985                         return error("%s", curl_errorstr);
 986                 }
 987         } else {
 988                 free(buffer.buffer);
 989                 return error("Unable to start request");
 990         }
 991
 992         data = buffer.buffer;
 993         while (i < buffer.posn) {
 994                 switch (data[i]) {
 995                 case 'P':
 996                         i++;
 997                         if (i + 52 < buffer.posn &&
 998                             !strncmp(data + i, " pack-", 6) &&
 999                             !strncmp(data + i + 46, ".pack\n", 6)) {
1000                                 get_sha1_hex(data + i + 6, sha1);
1001                                 setup_index(repo, sha1);
1002                                 i += 51;
1003                                 break;
1004                         }
1005                 default:
1006                         while (data[i] != '\n')
1007                                 i++;
1008                 }
1009                 i++;
1010         }
1011
1012         free(buffer.buffer);
1013         repo->got_indices = 1;
1014         return 0;
1015 }
1016
1017 static int fetch_pack(struct alt_base *repo, unsigned char *sha1)
1018 {
1019         char *url;
1020         struct packed_git *target;
1021         struct packed_git **lst;
1022         FILE *packfile;
1023         char *filename;
1024         char tmpfile[PATH_MAX];
1025         int ret;
1026         long prev_posn = 0;
1027         char range[RANGE_HEADER_SIZE];
1028         struct curl_slist *range_header = NULL;
1029
1030         struct active_request_slot *slot;
1031
1032         if (fetch_indices(repo))
1033                 return -1;
1034         target = find_sha1_pack(sha1, repo->packs);
1035         if (!target)
1036                 return -1;
1037
1038         if (get_verbosely) {
1039                 fprintf(stderr, "Getting pack %s\n",
1040                         sha1_to_hex(target->sha1));
1041                 fprintf(stderr, " which contains %s\n",
1042                         sha1_to_hex(sha1));
1043         }
1044
1045         url = xmalloc(strlen(repo->base) + 65);
1046         sprintf(url, "%s/objects/pack/pack-%s.pack",
1047                 repo->base, sha1_to_hex(target->sha1));
1048
1049         filename = sha1_pack_name(target->sha1);
1050         snprintf(tmpfile, sizeof(tmpfile), "%s.temp", filename);
1051         packfile = fopen(tmpfile, "a");
1052         if (!packfile)
1053                 return error("Unable to open local file %s for pack",
1054                              filename);
1055
1056         slot = get_active_slot();
1057         curl_easy_setopt(slot->curl, CURLOPT_FILE, packfile);
1058         curl_easy_setopt(slot->curl, CURLOPT_WRITEFUNCTION, fwrite);
1059         curl_easy_setopt(slot->curl, CURLOPT_URL, url);
1060         curl_easy_setopt(slot->curl, CURLOPT_HTTPHEADER, no_pragma_header);
1061         slot->local = packfile;
1062
1063         /* If there is data present from a previous transfer attempt,
1064            resume where it left off */
1065         prev_posn = ftell(packfile);
1066         if (prev_posn>0) {
1067                 if (get_verbosely)
1068                         fprintf(stderr,
1069                                 "Resuming fetch of pack %s at byte %ld\n",
1070                                 sha1_to_hex(target->sha1), prev_posn);
1071                 sprintf(range, "Range: bytes=%ld-", prev_posn);
1072                 range_header = curl_slist_append(range_header, range);
1073                 curl_easy_setopt(slot->curl, CURLOPT_HTTPHEADER, range_header);
1074         }
1075
1076         if (start_active_slot(slot)) {
1077                 run_active_slot(slot);
1078                 if (slot->curl_result != CURLE_OK) {
1079                         fclose(packfile);
1080                         return error("Unable to get pack file %s\n%s", url,
1081                                      curl_errorstr);
1082                 }
1083         } else {
1084                 return error("Unable to start request");
1085         }
1086
1087         fclose(packfile);
1088
1089         ret = move_temp_to_file(tmpfile, filename);
1090         if (ret)
1091                 return ret;
1092
1093         lst = &repo->packs;
1094         while (*lst != target)
1095                 lst = &((*lst)->next);
1096         *lst = (*lst)->next;
1097
1098         if (verify_pack(target, 0))
1099                 return -1;
1100         install_packed_git(target);
1101
1102         return 0;
1103 }
1104
1105 static int fetch_object(struct alt_base *repo, unsigned char *sha1)
1106 {
1107         char *hex = sha1_to_hex(sha1);
1108         int ret;
1109         struct transfer_request *request = request_queue_head;
1110
1111         while (request != NULL && memcmp(request->sha1, sha1, 20))
1112                 request = request->next;
1113         if (request == NULL)
1114                 return error("Couldn't find request for %s in the queue", hex);
1115
1116         if (has_sha1_file(request->sha1)) {
1117                 release_request(request);
1118                 return 0;
1119         }
1120
1121 #ifdef USE_CURL_MULTI
1122         while (request->state == WAITING) {
1123                 int num_transfers;
1124                 curl_multi_perform(curlm, &num_transfers);
1125                 if (num_transfers < active_requests) {
1126                         process_curl_messages();
1127                         process_request_queue();
1128                 }
1129         }
1130 #else
1131         start_request(request);
1132 #endif
1133
1134         while (request->state == ACTIVE) {
1135                 run_active_slot(request->slot);
1136 #ifndef USE_CURL_MULTI
1137                 request->curl_result = request->slot->curl_result;
1138                 request->http_code = request->slot->http_code;
1139                 request->slot = NULL;
1140
1141                 /* Use alternates if necessary */
1142                 if (request->http_code == 404) {
1143                         fetch_alternates(alt->base);
1144                         if (request->repo->next != NULL) {
1145                                 request->repo = request->repo->next;
1146                                 start_request(request);
1147                         }
1148                 } else {
1149                         finish_request(request);
1150                         request->state = COMPLETE;
1151                 }
1152 #endif
1153         }
1154
1155         if (request->state == ABORTED) {
1156                 release_request(request);
1157                 return error("Request for %s aborted", hex);
1158         }
1159
1160         if (request->curl_result != CURLE_OK && request->http_code != 416) {
1161                 if (request->http_code == 404)
1162                         ret = -1; /* Be silent, it is probably in a pack. */
1163                 else
1164                         ret = error("%s (curl_result = %d, http_code = %ld, sha1 = %s)",
1165                                     request->errorstr, request->curl_result,
1166                                     request->http_code, hex);
1167                 release_request(request);
1168                 return ret;
1169         }
1170
1171         if (request->zret != Z_STREAM_END) {
1172                 ret = error("File %s (%s) corrupt\n", hex, request->url);
1173                 release_request(request);
1174                 return ret;
1175         }
1176
1177         if (memcmp(request->sha1, request->real_sha1, 20)) {
1178                 release_request(request);
1179                 return error("File %s has bad hash\n", hex);
1180         }
1181
1182         if (request->rename < 0) {
1183                 ret = error("unable to write sha1 filename %s: %s",
1184                             request->filename,
1185                             strerror(request->rename));
1186                 release_request(request);
1187                 return ret;
1188         }
1189
1190         release_request(request);
1191         return 0;
1192 }
1193
1194 int fetch(unsigned char *sha1)
1195 {
1196         struct alt_base *altbase = alt;
1197
1198         if (!fetch_object(altbase, sha1))
1199                 return 0;
1200         while (altbase) {
1201                 if (!fetch_pack(altbase, sha1))
1202                         return 0;
1203                 fetch_alternates(alt->base);
1204                 altbase = altbase->next;
1205         }
1206         return error("Unable to find %s under %s\n", sha1_to_hex(sha1),
1207                      alt->base);
1208 }
1209
1210 static inline int needs_quote(int ch)
1211 {
1212         switch (ch) {
1213         case '/': case '-': case '.':
1214         case 'A'...'Z': case 'a'...'z': case '0'...'9':
1215                 return 0;
1216         default:
1217                 return 1;
1218         }
1219 }
1220
1221 static inline int hex(int v)
1222 {
1223         if (v < 10) return '0' + v;
1224         else return 'A' + v - 10;
1225 }
1226
1227 static char *quote_ref_url(const char *base, const char *ref)
1228 {
1229         const char *cp;
1230         char *dp, *qref;
1231         int len, baselen, ch;
1232
1233         baselen = strlen(base);
1234         len = baselen + 6; /* "refs/" + NUL */
1235         for (cp = ref; (ch = *cp) != 0; cp++, len++)
1236                 if (needs_quote(ch))
1237                         len += 2; /* extra two hex plus replacement % */
1238         qref = xmalloc(len);
1239         memcpy(qref, base, baselen);
1240         memcpy(qref + baselen, "refs/", 5);
1241         for (cp = ref, dp = qref + baselen + 5; (ch = *cp) != 0; cp++) {
1242                 if (needs_quote(ch)) {
1243                         *dp++ = '%';
1244                         *dp++ = hex((ch >> 4) & 0xF);
1245                         *dp++ = hex(ch & 0xF);
1246                 }
1247                 else
1248                         *dp++ = ch;
1249         }
1250         *dp = 0;
1251
1252         return qref;
1253 }
1254
1255 int fetch_ref(char *ref, unsigned char *sha1)
1256 {
1257         char *url;
1258         char hex[42];
1259         struct buffer buffer;
1260         char *base = alt->base;
1261         struct active_request_slot *slot;
1262         buffer.size = 41;
1263         buffer.posn = 0;
1264         buffer.buffer = hex;
1265         hex[41] = '\0';
1266
1267         url = quote_ref_url(base, ref);
1268         slot = get_active_slot();
1269         curl_easy_setopt(slot->curl, CURLOPT_FILE, &buffer);
1270         curl_easy_setopt(slot->curl, CURLOPT_WRITEFUNCTION, fwrite_buffer);
1271         curl_easy_setopt(slot->curl, CURLOPT_HTTPHEADER, NULL);
1272         curl_easy_setopt(slot->curl, CURLOPT_URL, url);
1273         if (start_active_slot(slot)) {
1274                 run_active_slot(slot);
1275                 if (slot->curl_result != CURLE_OK)
1276                         return error("Couldn't get %s for %s\n%s",
1277                                      url, ref, curl_errorstr);
1278         } else {
1279                 return error("Unable to start request");
1280         }
1281
1282         hex[40] = '\0';
1283         get_sha1_hex(hex, sha1);
1284         return 0;
1285 }
1286
1287 int main(int argc, char **argv)
1288 {
1289         char *commit_id;
1290         char *url;
1291         int arg = 1;
1292         struct active_request_slot *slot;
1293         char *low_speed_limit;
1294         char *low_speed_time;
1295         char *wait_url;
1296         int rc = 0;
1297
1298         while (arg < argc && argv[arg][0] == '-') {
1299                 if (argv[arg][1] == 't') {
1300                         get_tree = 1;
1301                 } else if (argv[arg][1] == 'c') {
1302                         get_history = 1;
1303                 } else if (argv[arg][1] == 'a') {
1304                         get_all = 1;
1305                         get_tree = 1;
1306                         get_history = 1;
1307                 } else if (argv[arg][1] == 'v') {
1308                         get_verbosely = 1;
1309                 } else if (argv[arg][1] == 'w') {
1310                         write_ref = argv[arg + 1];
1311                         arg++;
1312                 } else if (!strcmp(argv[arg], "--recover")) {
1313                         get_recover = 1;
1314                 }
1315                 arg++;
1316         }
1317         if (argc < arg + 2) {
1318                 usage("git-http-fetch [-c] [-t] [-a] [-d] [-v] [--recover] [-w ref] commit-id url");
1319                 return 1;
1320         }
1321         commit_id = argv[arg];
1322         url = argv[arg + 1];
1323
1324         curl_global_init(CURL_GLOBAL_ALL);
1325
1326 #ifdef USE_CURL_MULTI
1327         {
1328                 char *http_max_requests = getenv("GIT_HTTP_MAX_REQUESTS");
1329                 if (http_max_requests != NULL)
1330                         max_requests = atoi(http_max_requests);
1331         }
1332
1333         curlm = curl_multi_init();
1334         if (curlm == NULL) {
1335                 fprintf(stderr, "Error creating curl multi handle.\n");
1336                 return 1;
1337         }
1338 #endif
1339
1340         if (getenv("GIT_SSL_NO_VERIFY"))
1341                 curl_ssl_verify = 0;
1342
1343         ssl_cert = getenv("GIT_SSL_CERT");
1344 #if LIBCURL_VERSION_NUM >= 0x070902
1345         ssl_key = getenv("GIT_SSL_KEY");
1346 #endif
1347 #if LIBCURL_VERSION_NUM >= 0x070908
1348         ssl_capath = getenv("GIT_SSL_CAPATH");
1349 #endif
1350         ssl_cainfo = getenv("GIT_SSL_CAINFO");
1351
1352         low_speed_limit = getenv("GIT_HTTP_LOW_SPEED_LIMIT");
1353         if (low_speed_limit != NULL)
1354                 curl_low_speed_limit = strtol(low_speed_limit, NULL, 10);
1355         low_speed_time = getenv("GIT_HTTP_LOW_SPEED_TIME");
1356         if (low_speed_time != NULL)
1357                 curl_low_speed_time = strtol(low_speed_time, NULL, 10);
1358
1359         git_config(http_options);
1360
1361         if (curl_ssl_verify == -1)
1362                 curl_ssl_verify = 1;
1363
1364 #ifdef USE_CURL_MULTI
1365         if (max_requests < 1)
1366                 max_requests = DEFAULT_MAX_REQUESTS;
1367 #endif
1368
1369         pragma_header = curl_slist_append(pragma_header, "Pragma: no-cache");
1370         no_pragma_header = curl_slist_append(no_pragma_header, "Pragma:");
1371         no_range_header = curl_slist_append(no_range_header, "Range:");
1372
1373 #ifndef NO_CURL_EASY_DUPHANDLE
1374         curl_default = get_curl_handle();
1375 #endif
1376
1377         alt = xmalloc(sizeof(*alt));
1378         alt->base = url;
1379         alt->got_indices = 0;
1380         alt->packs = NULL;
1381         alt->next = NULL;
1382
1383         if (pull(commit_id))
1384                 rc = 1;
1385
1386         curl_slist_free_all(pragma_header);
1387         curl_slist_free_all(no_pragma_header);
1388         curl_slist_free_all(no_range_header);
1389 #ifndef NO_CURL_EASY_DUPHANDLE
1390         curl_easy_cleanup(curl_default);
1391 #endif
1392         slot = active_queue_head;
1393         while (slot != NULL) {
1394                 if (slot->in_use) {
1395                         if (get_verbosely) {
1396                                 curl_easy_getinfo(slot->curl,
1397                                                   CURLINFO_EFFECTIVE_URL,
1398                                                   &wait_url);
1399                                 fprintf(stderr, "Waiting for %s\n", wait_url);
1400                         }
1401                         run_active_slot(slot);
1402                 }
1403                 if (slot->curl != NULL)
1404                         curl_easy_cleanup(slot->curl);
1405                 slot = slot->next;
1406         }
1407 #ifdef USE_CURL_MULTI
1408         curl_multi_cleanup(curlm);
1409 #endif
1410         curl_global_cleanup();
1411         return rc;
1412 }