git.oblomov.eu Git - git/blob - http.c

   1 #include "http.h"
   2 #include "pack.h"
   3 #include "sideband.h"
   4 #include "run-command.h"
   5 #include "url.h"
   6 #include "urlmatch.h"
   7 #include "credential.h"
   8 #include "version.h"
   9 #include "pkt-line.h"
  10
  11 int active_requests;
  12 int http_is_verbose;
  13 size_t http_post_buffer = 16 * LARGE_PACKET_MAX;
  14
  15 #if LIBCURL_VERSION_NUM >= 0x070a06
  16 #define LIBCURL_CAN_HANDLE_AUTH_ANY
  17 #endif
  18
  19 static int min_curl_sessions = 1;
  20 static int curl_session_count;
  21 #ifdef USE_CURL_MULTI
  22 static int max_requests = -1;
  23 static CURLM *curlm;
  24 #endif
  25 #ifndef NO_CURL_EASY_DUPHANDLE
  26 static CURL *curl_default;
  27 #endif
  28
  29 #define PREV_BUF_SIZE 4096
  30 #define RANGE_HEADER_SIZE 30
  31
  32 char curl_errorstr[CURL_ERROR_SIZE];
  33
  34 static int curl_ssl_verify = -1;
  35 static int curl_ssl_try;
  36 static const char *ssl_cert;
  37 #if LIBCURL_VERSION_NUM >= 0x070903
  38 static const char *ssl_key;
  39 #endif
  40 #if LIBCURL_VERSION_NUM >= 0x070908
  41 static const char *ssl_capath;
  42 #endif
  43 static const char *ssl_cainfo;
  44 static long curl_low_speed_limit = -1;
  45 static long curl_low_speed_time = -1;
  46 static int curl_ftp_no_epsv;
  47 static const char *curl_http_proxy;
  48 static const char *curl_cookie_file;
  49 static int curl_save_cookies;
  50 struct credential http_auth = CREDENTIAL_INIT;
  51 static int http_proactive_auth;
  52 static const char *user_agent;
  53
  54 #if LIBCURL_VERSION_NUM >= 0x071700
  55 /* Use CURLOPT_KEYPASSWD as is */
  56 #elif LIBCURL_VERSION_NUM >= 0x070903
  57 #define CURLOPT_KEYPASSWD CURLOPT_SSLKEYPASSWD
  58 #else
  59 #define CURLOPT_KEYPASSWD CURLOPT_SSLCERTPASSWD
  60 #endif
  61
  62 static struct credential cert_auth = CREDENTIAL_INIT;
  63 static int ssl_cert_password_required;
  64
  65 static struct curl_slist *pragma_header;
  66 static struct curl_slist *no_pragma_header;
  67
  68 static struct active_request_slot *active_queue_head;
  69
  70 size_t fread_buffer(char *ptr, size_t eltsize, size_t nmemb, void *buffer_)
  71 {
  72         size_t size = eltsize * nmemb;
  73         struct buffer *buffer = buffer_;
  74
  75         if (size > buffer->buf.len - buffer->posn)
  76                 size = buffer->buf.len - buffer->posn;
  77         memcpy(ptr, buffer->buf.buf + buffer->posn, size);
  78         buffer->posn += size;
  79
  80         return size;
  81 }
  82
  83 #ifndef NO_CURL_IOCTL
  84 curlioerr ioctl_buffer(CURL *handle, int cmd, void *clientp)
  85 {
  86         struct buffer *buffer = clientp;
  87
  88         switch (cmd) {
  89         case CURLIOCMD_NOP:
  90                 return CURLIOE_OK;
  91
  92         case CURLIOCMD_RESTARTREAD:
  93                 buffer->posn = 0;
  94                 return CURLIOE_OK;
  95
  96         default:
  97                 return CURLIOE_UNKNOWNCMD;
  98         }
  99 }
 100 #endif
 101
 102 size_t fwrite_buffer(char *ptr, size_t eltsize, size_t nmemb, void *buffer_)
 103 {
 104         size_t size = eltsize * nmemb;
 105         struct strbuf *buffer = buffer_;
 106
 107         strbuf_add(buffer, ptr, size);
 108         return size;
 109 }
 110
 111 size_t fwrite_null(char *ptr, size_t eltsize, size_t nmemb, void *strbuf)
 112 {
 113         return eltsize * nmemb;
 114 }
 115
 116 #ifdef USE_CURL_MULTI
 117 static void process_curl_messages(void)
 118 {
 119         int num_messages;
 120         struct active_request_slot *slot;
 121         CURLMsg *curl_message = curl_multi_info_read(curlm, &num_messages);
 122
 123         while (curl_message != NULL) {
 124                 if (curl_message->msg == CURLMSG_DONE) {
 125                         int curl_result = curl_message->data.result;
 126                         slot = active_queue_head;
 127                         while (slot != NULL &&
 128                                slot->curl != curl_message->easy_handle)
 129                                 slot = slot->next;
 130                         if (slot != NULL) {
 131                                 curl_multi_remove_handle(curlm, slot->curl);
 132                                 slot->curl_result = curl_result;
 133                                 finish_active_slot(slot);
 134                         } else {
 135                                 fprintf(stderr, "Received DONE message for unknown request!\n");
 136                         }
 137                 } else {
 138                         fprintf(stderr, "Unknown CURL message received: %d\n",
 139                                 (int)curl_message->msg);
 140                 }
 141                 curl_message = curl_multi_info_read(curlm, &num_messages);
 142         }
 143 }
 144 #endif
 145
 146 static int http_options(const char *var, const char *value, void *cb)
 147 {
 148         if (!strcmp("http.sslverify", var)) {
 149                 curl_ssl_verify = git_config_bool(var, value);
 150                 return 0;
 151         }
 152         if (!strcmp("http.sslcert", var))
 153                 return git_config_string(&ssl_cert, var, value);
 154 #if LIBCURL_VERSION_NUM >= 0x070903
 155         if (!strcmp("http.sslkey", var))
 156                 return git_config_string(&ssl_key, var, value);
 157 #endif
 158 #if LIBCURL_VERSION_NUM >= 0x070908
 159         if (!strcmp("http.sslcapath", var))
 160                 return git_config_string(&ssl_capath, var, value);
 161 #endif
 162         if (!strcmp("http.sslcainfo", var))
 163                 return git_config_string(&ssl_cainfo, var, value);
 164         if (!strcmp("http.sslcertpasswordprotected", var)) {
 165                 ssl_cert_password_required = git_config_bool(var, value);
 166                 return 0;
 167         }
 168         if (!strcmp("http.ssltry", var)) {
 169                 curl_ssl_try = git_config_bool(var, value);
 170                 return 0;
 171         }
 172         if (!strcmp("http.minsessions", var)) {
 173                 min_curl_sessions = git_config_int(var, value);
 174 #ifndef USE_CURL_MULTI
 175                 if (min_curl_sessions > 1)
 176                         min_curl_sessions = 1;
 177 #endif
 178                 return 0;
 179         }
 180 #ifdef USE_CURL_MULTI
 181         if (!strcmp("http.maxrequests", var)) {
 182                 max_requests = git_config_int(var, value);
 183                 return 0;
 184         }
 185 #endif
 186         if (!strcmp("http.lowspeedlimit", var)) {
 187                 curl_low_speed_limit = (long)git_config_int(var, value);
 188                 return 0;
 189         }
 190         if (!strcmp("http.lowspeedtime", var)) {
 191                 curl_low_speed_time = (long)git_config_int(var, value);
 192                 return 0;
 193         }
 194
 195         if (!strcmp("http.noepsv", var)) {
 196                 curl_ftp_no_epsv = git_config_bool(var, value);
 197                 return 0;
 198         }
 199         if (!strcmp("http.proxy", var))
 200                 return git_config_string(&curl_http_proxy, var, value);
 201
 202         if (!strcmp("http.cookiefile", var))
 203                 return git_config_string(&curl_cookie_file, var, value);
 204         if (!strcmp("http.savecookies", var)) {
 205                 curl_save_cookies = git_config_bool(var, value);
 206                 return 0;
 207         }
 208
 209         if (!strcmp("http.postbuffer", var)) {
 210                 http_post_buffer = git_config_int(var, value);
 211                 if (http_post_buffer < LARGE_PACKET_MAX)
 212                         http_post_buffer = LARGE_PACKET_MAX;
 213                 return 0;
 214         }
 215
 216         if (!strcmp("http.useragent", var))
 217                 return git_config_string(&user_agent, var, value);
 218
 219         /* Fall back on the default ones */
 220         return git_default_config(var, value, cb);
 221 }
 222
 223 static void init_curl_http_auth(CURL *result)
 224 {
 225         if (!http_auth.username)
 226                 return;
 227
 228         credential_fill(&http_auth);
 229
 230 #if LIBCURL_VERSION_NUM >= 0x071301
 231         curl_easy_setopt(result, CURLOPT_USERNAME, http_auth.username);
 232         curl_easy_setopt(result, CURLOPT_PASSWORD, http_auth.password);
 233 #else
 234         {
 235                 static struct strbuf up = STRBUF_INIT;
 236                 /*
 237                  * Note that we assume we only ever have a single set of
 238                  * credentials in a given program run, so we do not have
 239                  * to worry about updating this buffer, only setting its
 240                  * initial value.
 241                  */
 242                 if (!up.len)
 243                         strbuf_addf(&up, "%s:%s",
 244                                 http_auth.username, http_auth.password);
 245                 curl_easy_setopt(result, CURLOPT_USERPWD, up.buf);
 246         }
 247 #endif
 248 }
 249
 250 static int has_cert_password(void)
 251 {
 252         if (ssl_cert == NULL || ssl_cert_password_required != 1)
 253                 return 0;
 254         if (!cert_auth.password) {
 255                 cert_auth.protocol = xstrdup("cert");
 256                 cert_auth.username = xstrdup("");
 257                 cert_auth.path = xstrdup(ssl_cert);
 258                 credential_fill(&cert_auth);
 259         }
 260         return 1;
 261 }
 262
 263 #if LIBCURL_VERSION_NUM >= 0x071900
 264 static void set_curl_keepalive(CURL *c)
 265 {
 266         curl_easy_setopt(c, CURLOPT_TCP_KEEPALIVE, 1);
 267 }
 268
 269 #elif LIBCURL_VERSION_NUM >= 0x071000
 270 static int sockopt_callback(void *client, curl_socket_t fd, curlsocktype type)
 271 {
 272         int ka = 1;
 273         int rc;
 274         socklen_t len = (socklen_t)sizeof(ka);
 275
 276         if (type != CURLSOCKTYPE_IPCXN)
 277                 return 0;
 278
 279         rc = setsockopt(fd, SOL_SOCKET, SO_KEEPALIVE, (void *)&ka, len);
 280         if (rc < 0)
 281                 warning("unable to set SO_KEEPALIVE on socket %s",
 282                         strerror(errno));
 283
 284         return 0; /* CURL_SOCKOPT_OK only exists since curl 7.21.5 */
 285 }
 286
 287 static void set_curl_keepalive(CURL *c)
 288 {
 289         curl_easy_setopt(c, CURLOPT_SOCKOPTFUNCTION, sockopt_callback);
 290 }
 291
 292 #else
 293 static void set_curl_keepalive(CURL *c)
 294 {
 295         /* not supported on older curl versions */
 296 }
 297 #endif
 298
 299 static CURL *get_curl_handle(void)
 300 {
 301         CURL *result = curl_easy_init();
 302
 303         if (!result)
 304                 die("curl_easy_init failed");
 305
 306         if (!curl_ssl_verify) {
 307                 curl_easy_setopt(result, CURLOPT_SSL_VERIFYPEER, 0);
 308                 curl_easy_setopt(result, CURLOPT_SSL_VERIFYHOST, 0);
 309         } else {
 310                 /* Verify authenticity of the peer's certificate */
 311                 curl_easy_setopt(result, CURLOPT_SSL_VERIFYPEER, 1);
 312                 /* The name in the cert must match whom we tried to connect */
 313                 curl_easy_setopt(result, CURLOPT_SSL_VERIFYHOST, 2);
 314         }
 315
 316 #if LIBCURL_VERSION_NUM >= 0x070907
 317         curl_easy_setopt(result, CURLOPT_NETRC, CURL_NETRC_OPTIONAL);
 318 #endif
 319 #ifdef LIBCURL_CAN_HANDLE_AUTH_ANY
 320         curl_easy_setopt(result, CURLOPT_HTTPAUTH, CURLAUTH_ANY);
 321 #endif
 322
 323         if (http_proactive_auth)
 324                 init_curl_http_auth(result);
 325
 326         if (ssl_cert != NULL)
 327                 curl_easy_setopt(result, CURLOPT_SSLCERT, ssl_cert);
 328         if (has_cert_password())
 329                 curl_easy_setopt(result, CURLOPT_KEYPASSWD, cert_auth.password);
 330 #if LIBCURL_VERSION_NUM >= 0x070903
 331         if (ssl_key != NULL)
 332                 curl_easy_setopt(result, CURLOPT_SSLKEY, ssl_key);
 333 #endif
 334 #if LIBCURL_VERSION_NUM >= 0x070908
 335         if (ssl_capath != NULL)
 336                 curl_easy_setopt(result, CURLOPT_CAPATH, ssl_capath);
 337 #endif
 338         if (ssl_cainfo != NULL)
 339                 curl_easy_setopt(result, CURLOPT_CAINFO, ssl_cainfo);
 340
 341         if (curl_low_speed_limit > 0 && curl_low_speed_time > 0) {
 342                 curl_easy_setopt(result, CURLOPT_LOW_SPEED_LIMIT,
 343                                  curl_low_speed_limit);
 344                 curl_easy_setopt(result, CURLOPT_LOW_SPEED_TIME,
 345                                  curl_low_speed_time);
 346         }
 347
 348         curl_easy_setopt(result, CURLOPT_FOLLOWLOCATION, 1);
 349 #if LIBCURL_VERSION_NUM >= 0x071301
 350         curl_easy_setopt(result, CURLOPT_POSTREDIR, CURL_REDIR_POST_ALL);
 351 #elif LIBCURL_VERSION_NUM >= 0x071101
 352         curl_easy_setopt(result, CURLOPT_POST301, 1);
 353 #endif
 354
 355         if (getenv("GIT_CURL_VERBOSE"))
 356                 curl_easy_setopt(result, CURLOPT_VERBOSE, 1);
 357
 358         curl_easy_setopt(result, CURLOPT_USERAGENT,
 359                 user_agent ? user_agent : git_user_agent());
 360
 361         if (curl_ftp_no_epsv)
 362                 curl_easy_setopt(result, CURLOPT_FTP_USE_EPSV, 0);
 363
 364 #ifdef CURLOPT_USE_SSL
 365         if (curl_ssl_try)
 366                 curl_easy_setopt(result, CURLOPT_USE_SSL, CURLUSESSL_TRY);
 367 #endif
 368
 369         if (curl_http_proxy) {
 370                 curl_easy_setopt(result, CURLOPT_PROXY, curl_http_proxy);
 371                 curl_easy_setopt(result, CURLOPT_PROXYAUTH, CURLAUTH_ANY);
 372         }
 373
 374         set_curl_keepalive(result);
 375
 376         return result;
 377 }
 378
 379 static void set_from_env(const char **var, const char *envname)
 380 {
 381         const char *val = getenv(envname);
 382         if (val)
 383                 *var = val;
 384 }
 385
 386 void http_init(struct remote *remote, const char *url, int proactive_auth)
 387 {
 388         char *low_speed_limit;
 389         char *low_speed_time;
 390         char *normalized_url;
 391         struct urlmatch_config config = { STRING_LIST_INIT_DUP };
 392
 393         config.section = "http";
 394         config.key = NULL;
 395         config.collect_fn = http_options;
 396         config.cascade_fn = git_default_config;
 397         config.cb = NULL;
 398
 399         http_is_verbose = 0;
 400         normalized_url = url_normalize(url, &config.url);
 401
 402         git_config(urlmatch_config_entry, &config);
 403         free(normalized_url);
 404
 405         if (curl_global_init(CURL_GLOBAL_ALL) != CURLE_OK)
 406                 die("curl_global_init failed");
 407
 408         http_proactive_auth = proactive_auth;
 409
 410         if (remote && remote->http_proxy)
 411                 curl_http_proxy = xstrdup(remote->http_proxy);
 412
 413         pragma_header = curl_slist_append(pragma_header, "Pragma: no-cache");
 414         no_pragma_header = curl_slist_append(no_pragma_header, "Pragma:");
 415
 416 #ifdef USE_CURL_MULTI
 417         {
 418                 char *http_max_requests = getenv("GIT_HTTP_MAX_REQUESTS");
 419                 if (http_max_requests != NULL)
 420                         max_requests = atoi(http_max_requests);
 421         }
 422
 423         curlm = curl_multi_init();
 424         if (!curlm)
 425                 die("curl_multi_init failed");
 426 #endif
 427
 428         if (getenv("GIT_SSL_NO_VERIFY"))
 429                 curl_ssl_verify = 0;
 430
 431         set_from_env(&ssl_cert, "GIT_SSL_CERT");
 432 #if LIBCURL_VERSION_NUM >= 0x070903
 433         set_from_env(&ssl_key, "GIT_SSL_KEY");
 434 #endif
 435 #if LIBCURL_VERSION_NUM >= 0x070908
 436         set_from_env(&ssl_capath, "GIT_SSL_CAPATH");
 437 #endif
 438         set_from_env(&ssl_cainfo, "GIT_SSL_CAINFO");
 439
 440         set_from_env(&user_agent, "GIT_HTTP_USER_AGENT");
 441
 442         low_speed_limit = getenv("GIT_HTTP_LOW_SPEED_LIMIT");
 443         if (low_speed_limit != NULL)
 444                 curl_low_speed_limit = strtol(low_speed_limit, NULL, 10);
 445         low_speed_time = getenv("GIT_HTTP_LOW_SPEED_TIME");
 446         if (low_speed_time != NULL)
 447                 curl_low_speed_time = strtol(low_speed_time, NULL, 10);
 448
 449         if (curl_ssl_verify == -1)
 450                 curl_ssl_verify = 1;
 451
 452         curl_session_count = 0;
 453 #ifdef USE_CURL_MULTI
 454         if (max_requests < 1)
 455                 max_requests = DEFAULT_MAX_REQUESTS;
 456 #endif
 457
 458         if (getenv("GIT_CURL_FTP_NO_EPSV"))
 459                 curl_ftp_no_epsv = 1;
 460
 461         if (url) {
 462                 credential_from_url(&http_auth, url);
 463                 if (!ssl_cert_password_required &&
 464                     getenv("GIT_SSL_CERT_PASSWORD_PROTECTED") &&
 465                     starts_with(url, "https://"))
 466                         ssl_cert_password_required = 1;
 467         }
 468
 469 #ifndef NO_CURL_EASY_DUPHANDLE
 470         curl_default = get_curl_handle();
 471 #endif
 472 }
 473
 474 void http_cleanup(void)
 475 {
 476         struct active_request_slot *slot = active_queue_head;
 477
 478         while (slot != NULL) {
 479                 struct active_request_slot *next = slot->next;
 480                 if (slot->curl != NULL) {
 481 #ifdef USE_CURL_MULTI
 482                         curl_multi_remove_handle(curlm, slot->curl);
 483 #endif
 484                         curl_easy_cleanup(slot->curl);
 485                 }
 486                 free(slot);
 487                 slot = next;
 488         }
 489         active_queue_head = NULL;
 490
 491 #ifndef NO_CURL_EASY_DUPHANDLE
 492         curl_easy_cleanup(curl_default);
 493 #endif
 494
 495 #ifdef USE_CURL_MULTI
 496         curl_multi_cleanup(curlm);
 497 #endif
 498         curl_global_cleanup();
 499
 500         curl_slist_free_all(pragma_header);
 501         pragma_header = NULL;
 502
 503         curl_slist_free_all(no_pragma_header);
 504         no_pragma_header = NULL;
 505
 506         if (curl_http_proxy) {
 507                 free((void *)curl_http_proxy);
 508                 curl_http_proxy = NULL;
 509         }
 510
 511         if (cert_auth.password != NULL) {
 512                 memset(cert_auth.password, 0, strlen(cert_auth.password));
 513                 free(cert_auth.password);
 514                 cert_auth.password = NULL;
 515         }
 516         ssl_cert_password_required = 0;
 517 }
 518
 519 struct active_request_slot *get_active_slot(void)
 520 {
 521         struct active_request_slot *slot = active_queue_head;
 522         struct active_request_slot *newslot;
 523
 524 #ifdef USE_CURL_MULTI
 525         int num_transfers;
 526
 527         /* Wait for a slot to open up if the queue is full */
 528         while (active_requests >= max_requests) {
 529                 curl_multi_perform(curlm, &num_transfers);
 530                 if (num_transfers < active_requests)
 531                         process_curl_messages();
 532         }
 533 #endif
 534
 535         while (slot != NULL && slot->in_use)
 536                 slot = slot->next;
 537
 538         if (slot == NULL) {
 539                 newslot = xmalloc(sizeof(*newslot));
 540                 newslot->curl = NULL;
 541                 newslot->in_use = 0;
 542                 newslot->next = NULL;
 543
 544                 slot = active_queue_head;
 545                 if (slot == NULL) {
 546                         active_queue_head = newslot;
 547                 } else {
 548                         while (slot->next != NULL)
 549                                 slot = slot->next;
 550                         slot->next = newslot;
 551                 }
 552                 slot = newslot;
 553         }
 554
 555         if (slot->curl == NULL) {
 556 #ifdef NO_CURL_EASY_DUPHANDLE
 557                 slot->curl = get_curl_handle();
 558 #else
 559                 slot->curl = curl_easy_duphandle(curl_default);
 560 #endif
 561                 curl_session_count++;
 562         }
 563
 564         active_requests++;
 565         slot->in_use = 1;
 566         slot->results = NULL;
 567         slot->finished = NULL;
 568         slot->callback_data = NULL;
 569         slot->callback_func = NULL;
 570         curl_easy_setopt(slot->curl, CURLOPT_COOKIEFILE, curl_cookie_file);
 571         if (curl_save_cookies)
 572                 curl_easy_setopt(slot->curl, CURLOPT_COOKIEJAR, curl_cookie_file);
 573         curl_easy_setopt(slot->curl, CURLOPT_HTTPHEADER, pragma_header);
 574         curl_easy_setopt(slot->curl, CURLOPT_ERRORBUFFER, curl_errorstr);
 575         curl_easy_setopt(slot->curl, CURLOPT_CUSTOMREQUEST, NULL);
 576         curl_easy_setopt(slot->curl, CURLOPT_READFUNCTION, NULL);
 577         curl_easy_setopt(slot->curl, CURLOPT_WRITEFUNCTION, NULL);
 578         curl_easy_setopt(slot->curl, CURLOPT_POSTFIELDS, NULL);
 579         curl_easy_setopt(slot->curl, CURLOPT_UPLOAD, 0);
 580         curl_easy_setopt(slot->curl, CURLOPT_HTTPGET, 1);
 581         curl_easy_setopt(slot->curl, CURLOPT_FAILONERROR, 1);
 582         if (http_auth.password)
 583                 init_curl_http_auth(slot->curl);
 584
 585         return slot;
 586 }
 587
 588 int start_active_slot(struct active_request_slot *slot)
 589 {
 590 #ifdef USE_CURL_MULTI
 591         CURLMcode curlm_result = curl_multi_add_handle(curlm, slot->curl);
 592         int num_transfers;
 593
 594         if (curlm_result != CURLM_OK &&
 595             curlm_result != CURLM_CALL_MULTI_PERFORM) {
 596                 active_requests--;
 597                 slot->in_use = 0;
 598                 return 0;
 599         }
 600
 601         /*
 602          * We know there must be something to do, since we just added
 603          * something.
 604          */
 605         curl_multi_perform(curlm, &num_transfers);
 606 #endif
 607         return 1;
 608 }
 609
 610 #ifdef USE_CURL_MULTI
 611 struct fill_chain {
 612         void *data;
 613         int (*fill)(void *);
 614         struct fill_chain *next;
 615 };
 616
 617 static struct fill_chain *fill_cfg;
 618
 619 void add_fill_function(void *data, int (*fill)(void *))
 620 {
 621         struct fill_chain *new = xmalloc(sizeof(*new));
 622         struct fill_chain **linkp = &fill_cfg;
 623         new->data = data;
 624         new->fill = fill;
 625         new->next = NULL;
 626         while (*linkp)
 627                 linkp = &(*linkp)->next;
 628         *linkp = new;
 629 }
 630
 631 void fill_active_slots(void)
 632 {
 633         struct active_request_slot *slot = active_queue_head;
 634
 635         while (active_requests < max_requests) {
 636                 struct fill_chain *fill;
 637                 for (fill = fill_cfg; fill; fill = fill->next)
 638                         if (fill->fill(fill->data))
 639                                 break;
 640
 641                 if (!fill)
 642                         break;
 643         }
 644
 645         while (slot != NULL) {
 646                 if (!slot->in_use && slot->curl != NULL
 647                         && curl_session_count > min_curl_sessions) {
 648                         curl_easy_cleanup(slot->curl);
 649                         slot->curl = NULL;
 650                         curl_session_count--;
 651                 }
 652                 slot = slot->next;
 653         }
 654 }
 655
 656 void step_active_slots(void)
 657 {
 658         int num_transfers;
 659         CURLMcode curlm_result;
 660
 661         do {
 662                 curlm_result = curl_multi_perform(curlm, &num_transfers);
 663         } while (curlm_result == CURLM_CALL_MULTI_PERFORM);
 664         if (num_transfers < active_requests) {
 665                 process_curl_messages();
 666                 fill_active_slots();
 667         }
 668 }
 669 #endif
 670
 671 void run_active_slot(struct active_request_slot *slot)
 672 {
 673 #ifdef USE_CURL_MULTI
 674         fd_set readfds;
 675         fd_set writefds;
 676         fd_set excfds;
 677         int max_fd;
 678         struct timeval select_timeout;
 679         int finished = 0;
 680
 681         slot->finished = &finished;
 682         while (!finished) {
 683                 step_active_slots();
 684
 685                 if (slot->in_use) {
 686 #if LIBCURL_VERSION_NUM >= 0x070f04
 687                         long curl_timeout;
 688                         curl_multi_timeout(curlm, &curl_timeout);
 689                         if (curl_timeout == 0) {
 690                                 continue;
 691                         } else if (curl_timeout == -1) {
 692                                 select_timeout.tv_sec  = 0;
 693                                 select_timeout.tv_usec = 50000;
 694                         } else {
 695                                 select_timeout.tv_sec  =  curl_timeout / 1000;
 696                                 select_timeout.tv_usec = (curl_timeout % 1000) * 1000;
 697                         }
 698 #else
 699                         select_timeout.tv_sec  = 0;
 700                         select_timeout.tv_usec = 50000;
 701 #endif
 702
 703                         max_fd = -1;
 704                         FD_ZERO(&readfds);
 705                         FD_ZERO(&writefds);
 706                         FD_ZERO(&excfds);
 707                         curl_multi_fdset(curlm, &readfds, &writefds, &excfds, &max_fd);
 708
 709                         /*
 710                          * It can happen that curl_multi_timeout returns a pathologically
 711                          * long timeout when curl_multi_fdset returns no file descriptors
 712                          * to read.  See commit message for more details.
 713                          */
 714                         if (max_fd < 0 &&
 715                             (select_timeout.tv_sec > 0 ||
 716                              select_timeout.tv_usec > 50000)) {
 717                                 select_timeout.tv_sec  = 0;
 718                                 select_timeout.tv_usec = 50000;
 719                         }
 720
 721                         select(max_fd+1, &readfds, &writefds, &excfds, &select_timeout);
 722                 }
 723         }
 724 #else
 725         while (slot->in_use) {
 726                 slot->curl_result = curl_easy_perform(slot->curl);
 727                 finish_active_slot(slot);
 728         }
 729 #endif
 730 }
 731
 732 static void closedown_active_slot(struct active_request_slot *slot)
 733 {
 734         active_requests--;
 735         slot->in_use = 0;
 736 }
 737
 738 static void release_active_slot(struct active_request_slot *slot)
 739 {
 740         closedown_active_slot(slot);
 741         if (slot->curl && curl_session_count > min_curl_sessions) {
 742 #ifdef USE_CURL_MULTI
 743                 curl_multi_remove_handle(curlm, slot->curl);
 744 #endif
 745                 curl_easy_cleanup(slot->curl);
 746                 slot->curl = NULL;
 747                 curl_session_count--;
 748         }
 749 #ifdef USE_CURL_MULTI
 750         fill_active_slots();
 751 #endif
 752 }
 753
 754 void finish_active_slot(struct active_request_slot *slot)
 755 {
 756         closedown_active_slot(slot);
 757         curl_easy_getinfo(slot->curl, CURLINFO_HTTP_CODE, &slot->http_code);
 758
 759         if (slot->finished != NULL)
 760                 (*slot->finished) = 1;
 761
 762         /* Store slot results so they can be read after the slot is reused */
 763         if (slot->results != NULL) {
 764                 slot->results->curl_result = slot->curl_result;
 765                 slot->results->http_code = slot->http_code;
 766 #if LIBCURL_VERSION_NUM >= 0x070a08
 767                 curl_easy_getinfo(slot->curl, CURLINFO_HTTPAUTH_AVAIL,
 768                                   &slot->results->auth_avail);
 769 #else
 770                 slot->results->auth_avail = 0;
 771 #endif
 772         }
 773
 774         /* Run callback if appropriate */
 775         if (slot->callback_func != NULL)
 776                 slot->callback_func(slot->callback_data);
 777 }
 778
 779 void finish_all_active_slots(void)
 780 {
 781         struct active_request_slot *slot = active_queue_head;
 782
 783         while (slot != NULL)
 784                 if (slot->in_use) {
 785                         run_active_slot(slot);
 786                         slot = active_queue_head;
 787                 } else {
 788                         slot = slot->next;
 789                 }
 790 }
 791
 792 /* Helpers for modifying and creating URLs */
 793 static inline int needs_quote(int ch)
 794 {
 795         if (((ch >= 'A') && (ch <= 'Z'))
 796                         || ((ch >= 'a') && (ch <= 'z'))
 797                         || ((ch >= '0') && (ch <= '9'))
 798                         || (ch == '/')
 799                         || (ch == '-')
 800                         || (ch == '.'))
 801                 return 0;
 802         return 1;
 803 }
 804
 805 static char *quote_ref_url(const char *base, const char *ref)
 806 {
 807         struct strbuf buf = STRBUF_INIT;
 808         const char *cp;
 809         int ch;
 810
 811         end_url_with_slash(&buf, base);
 812
 813         for (cp = ref; (ch = *cp) != 0; cp++)
 814                 if (needs_quote(ch))
 815                         strbuf_addf(&buf, "%%%02x", ch);
 816                 else
 817                         strbuf_addch(&buf, *cp);
 818
 819         return strbuf_detach(&buf, NULL);
 820 }
 821
 822 void append_remote_object_url(struct strbuf *buf, const char *url,
 823                               const char *hex,
 824                               int only_two_digit_prefix)
 825 {
 826         end_url_with_slash(buf, url);
 827
 828         strbuf_addf(buf, "objects/%.*s/", 2, hex);
 829         if (!only_two_digit_prefix)
 830                 strbuf_addf(buf, "%s", hex+2);
 831 }
 832
 833 char *get_remote_object_url(const char *url, const char *hex,
 834                             int only_two_digit_prefix)
 835 {
 836         struct strbuf buf = STRBUF_INIT;
 837         append_remote_object_url(&buf, url, hex, only_two_digit_prefix);
 838         return strbuf_detach(&buf, NULL);
 839 }
 840
 841 int handle_curl_result(struct slot_results *results)
 842 {
 843         /*
 844          * If we see a failing http code with CURLE_OK, we have turned off
 845          * FAILONERROR (to keep the server's custom error response), and should
 846          * translate the code into failure here.
 847          */
 848         if (results->curl_result == CURLE_OK &&
 849             results->http_code >= 400) {
 850                 results->curl_result = CURLE_HTTP_RETURNED_ERROR;
 851                 /*
 852                  * Normally curl will already have put the "reason phrase"
 853                  * from the server into curl_errorstr; unfortunately without
 854                  * FAILONERROR it is lost, so we can give only the numeric
 855                  * status code.
 856                  */
 857                 snprintf(curl_errorstr, sizeof(curl_errorstr),
 858                          "The requested URL returned error: %ld",
 859                          results->http_code);
 860         }
 861
 862         if (results->curl_result == CURLE_OK) {
 863                 credential_approve(&http_auth);
 864                 return HTTP_OK;
 865         } else if (missing_target(results))
 866                 return HTTP_MISSING_TARGET;
 867         else if (results->http_code == 401) {
 868                 if (http_auth.username && http_auth.password) {
 869                         credential_reject(&http_auth);
 870                         return HTTP_NOAUTH;
 871                 } else {
 872                         return HTTP_REAUTH;
 873                 }
 874         } else {
 875 #if LIBCURL_VERSION_NUM >= 0x070c00
 876                 if (!curl_errorstr[0])
 877                         strlcpy(curl_errorstr,
 878                                 curl_easy_strerror(results->curl_result),
 879                                 sizeof(curl_errorstr));
 880 #endif
 881                 return HTTP_ERROR;
 882         }
 883 }
 884
 885 int run_one_slot(struct active_request_slot *slot,
 886                  struct slot_results *results)
 887 {
 888         slot->results = results;
 889         if (!start_active_slot(slot)) {
 890                 snprintf(curl_errorstr, sizeof(curl_errorstr),
 891                          "failed to start HTTP request");
 892                 return HTTP_START_FAILED;
 893         }
 894
 895         run_active_slot(slot);
 896         return handle_curl_result(results);
 897 }
 898
 899 static CURLcode curlinfo_strbuf(CURL *curl, CURLINFO info, struct strbuf *buf)
 900 {
 901         char *ptr;
 902         CURLcode ret;
 903
 904         strbuf_reset(buf);
 905         ret = curl_easy_getinfo(curl, info, &ptr);
 906         if (!ret && ptr)
 907                 strbuf_addstr(buf, ptr);
 908         return ret;
 909 }
 910
 911 /*
 912  * Check for and extract a content-type parameter. "raw"
 913  * should be positioned at the start of the potential
 914  * parameter, with any whitespace already removed.
 915  *
 916  * "name" is the name of the parameter. The value is appended
 917  * to "out".
 918  */
 919 static int extract_param(const char *raw, const char *name,
 920                          struct strbuf *out)
 921 {
 922         size_t len = strlen(name);
 923
 924         if (strncasecmp(raw, name, len))
 925                 return -1;
 926         raw += len;
 927
 928         if (*raw != '=')
 929                 return -1;
 930         raw++;
 931
 932         while (*raw && !isspace(*raw) && *raw != ';')
 933                 strbuf_addch(out, *raw++);
 934         return 0;
 935 }
 936
 937 /*
 938  * Extract a normalized version of the content type, with any
 939  * spaces suppressed, all letters lowercased, and no trailing ";"
 940  * or parameters.
 941  *
 942  * Note that we will silently remove even invalid whitespace. For
 943  * example, "text / plain" is specifically forbidden by RFC 2616,
 944  * but "text/plain" is the only reasonable output, and this keeps
 945  * our code simple.
 946  *
 947  * If the "charset" argument is not NULL, store the value of any
 948  * charset parameter there.
 949  *
 950  * Example:
 951  *   "TEXT/PLAIN; charset=utf-8" -> "text/plain", "utf-8"
 952  *   "text / plain" -> "text/plain"
 953  */
 954 static void extract_content_type(struct strbuf *raw, struct strbuf *type,
 955                                  struct strbuf *charset)
 956 {
 957         const char *p;
 958
 959         strbuf_reset(type);
 960         strbuf_grow(type, raw->len);
 961         for (p = raw->buf; *p; p++) {
 962                 if (isspace(*p))
 963                         continue;
 964                 if (*p == ';') {
 965                         p++;
 966                         break;
 967                 }
 968                 strbuf_addch(type, tolower(*p));
 969         }
 970
 971         if (!charset)
 972                 return;
 973
 974         strbuf_reset(charset);
 975         while (*p) {
 976                 while (isspace(*p) || *p == ';')
 977                         p++;
 978                 if (!extract_param(p, "charset", charset))
 979                         return;
 980                 while (*p && !isspace(*p))
 981                         p++;
 982         }
 983
 984         if (!charset->len && starts_with(type->buf, "text/"))
 985                 strbuf_addstr(charset, "ISO-8859-1");
 986 }
 987
 988 /* http_request() targets */
 989 #define HTTP_REQUEST_STRBUF     0
 990 #define HTTP_REQUEST_FILE       1
 991
 992 static int http_request(const char *url,
 993                         void *result, int target,
 994                         const struct http_get_options *options)
 995 {
 996         struct active_request_slot *slot;
 997         struct slot_results results;
 998         struct curl_slist *headers = NULL;
 999         struct strbuf buf = STRBUF_INIT;
1000         int ret;
1001
1002         slot = get_active_slot();
1003         curl_easy_setopt(slot->curl, CURLOPT_HTTPGET, 1);
1004
1005         if (result == NULL) {
1006                 curl_easy_setopt(slot->curl, CURLOPT_NOBODY, 1);
1007         } else {
1008                 curl_easy_setopt(slot->curl, CURLOPT_NOBODY, 0);
1009                 curl_easy_setopt(slot->curl, CURLOPT_FILE, result);
1010
1011                 if (target == HTTP_REQUEST_FILE) {
1012                         long posn = ftell(result);
1013                         curl_easy_setopt(slot->curl, CURLOPT_WRITEFUNCTION,
1014                                          fwrite);
1015                         if (posn > 0) {
1016                                 strbuf_addf(&buf, "Range: bytes=%ld-", posn);
1017                                 headers = curl_slist_append(headers, buf.buf);
1018                                 strbuf_reset(&buf);
1019                         }
1020                 } else
1021                         curl_easy_setopt(slot->curl, CURLOPT_WRITEFUNCTION,
1022                                          fwrite_buffer);
1023         }
1024
1025         strbuf_addstr(&buf, "Pragma:");
1026         if (options && options->no_cache)
1027                 strbuf_addstr(&buf, " no-cache");
1028         if (options && options->keep_error)
1029                 curl_easy_setopt(slot->curl, CURLOPT_FAILONERROR, 0);
1030
1031         headers = curl_slist_append(headers, buf.buf);
1032
1033         curl_easy_setopt(slot->curl, CURLOPT_URL, url);
1034         curl_easy_setopt(slot->curl, CURLOPT_HTTPHEADER, headers);
1035         curl_easy_setopt(slot->curl, CURLOPT_ENCODING, "gzip");
1036
1037         ret = run_one_slot(slot, &results);
1038
1039         if (options && options->content_type) {
1040                 struct strbuf raw = STRBUF_INIT;
1041                 curlinfo_strbuf(slot->curl, CURLINFO_CONTENT_TYPE, &raw);
1042                 extract_content_type(&raw, options->content_type,
1043                                      options->charset);
1044                 strbuf_release(&raw);
1045         }
1046
1047         if (options && options->effective_url)
1048                 curlinfo_strbuf(slot->curl, CURLINFO_EFFECTIVE_URL,
1049                                 options->effective_url);
1050
1051         curl_slist_free_all(headers);
1052         strbuf_release(&buf);
1053
1054         return ret;
1055 }
1056
1057 /*
1058  * Update the "base" url to a more appropriate value, as deduced by
1059  * redirects seen when requesting a URL starting with "url".
1060  *
1061  * The "asked" parameter is a URL that we asked curl to access, and must begin
1062  * with "base".
1063  *
1064  * The "got" parameter is the URL that curl reported to us as where we ended
1065  * up.
1066  *
1067  * Returns 1 if we updated the base url, 0 otherwise.
1068  *
1069  * Our basic strategy is to compare "base" and "asked" to find the bits
1070  * specific to our request. We then strip those bits off of "got" to yield the
1071  * new base. So for example, if our base is "http://example.com/foo.git",
1072  * and we ask for "http://example.com/foo.git/info/refs", we might end up
1073  * with "https://other.example.com/foo.git/info/refs". We would want the
1074  * new URL to become "https://other.example.com/foo.git".
1075  *
1076  * Note that this assumes a sane redirect scheme. It's entirely possible
1077  * in the example above to end up at a URL that does not even end in
1078  * "info/refs".  In such a case we simply punt, as there is not much we can
1079  * do (and such a scheme is unlikely to represent a real git repository,
1080  * which means we are likely about to abort anyway).
1081  */
1082 static int update_url_from_redirect(struct strbuf *base,
1083                                     const char *asked,
1084                                     const struct strbuf *got)
1085 {
1086         const char *tail;
1087         size_t tail_len;
1088
1089         if (!strcmp(asked, got->buf))
1090                 return 0;
1091
1092         if (!skip_prefix(asked, base->buf, &tail))
1093                 die("BUG: update_url_from_redirect: %s is not a superset of %s",
1094                     asked, base->buf);
1095
1096         tail_len = strlen(tail);
1097
1098         if (got->len < tail_len ||
1099             strcmp(tail, got->buf + got->len - tail_len))
1100                 return 0; /* insane redirect scheme */
1101
1102         strbuf_reset(base);
1103         strbuf_add(base, got->buf, got->len - tail_len);
1104         return 1;
1105 }
1106
1107 static int http_request_reauth(const char *url,
1108                                void *result, int target,
1109                                struct http_get_options *options)
1110 {
1111         int ret = http_request(url, result, target, options);
1112
1113         if (options && options->effective_url && options->base_url) {
1114                 if (update_url_from_redirect(options->base_url,
1115                                              url, options->effective_url)) {
1116                         credential_from_url(&http_auth, options->base_url->buf);
1117                         url = options->effective_url->buf;
1118                 }
1119         }
1120
1121         if (ret != HTTP_REAUTH)
1122                 return ret;
1123
1124         /*
1125          * If we are using KEEP_ERROR, the previous request may have
1126          * put cruft into our output stream; we should clear it out before
1127          * making our next request. We only know how to do this for
1128          * the strbuf case, but that is enough to satisfy current callers.
1129          */
1130         if (options && options->keep_error) {
1131                 switch (target) {
1132                 case HTTP_REQUEST_STRBUF:
1133                         strbuf_reset(result);
1134                         break;
1135                 default:
1136                         die("BUG: HTTP_KEEP_ERROR is only supported with strbufs");
1137                 }
1138         }
1139
1140         credential_fill(&http_auth);
1141
1142         return http_request(url, result, target, options);
1143 }
1144
1145 int http_get_strbuf(const char *url,
1146                     struct strbuf *result,
1147                     struct http_get_options *options)
1148 {
1149         return http_request_reauth(url, result, HTTP_REQUEST_STRBUF, options);
1150 }
1151
1152 /*
1153  * Downloads a URL and stores the result in the given file.
1154  *
1155  * If a previous interrupted download is detected (i.e. a previous temporary
1156  * file is still around) the download is resumed.
1157  */
1158 static int http_get_file(const char *url, const char *filename,
1159                          struct http_get_options *options)
1160 {
1161         int ret;
1162         struct strbuf tmpfile = STRBUF_INIT;
1163         FILE *result;
1164
1165         strbuf_addf(&tmpfile, "%s.temp", filename);
1166         result = fopen(tmpfile.buf, "a");
1167         if (!result) {
1168                 error("Unable to open local file %s", tmpfile.buf);
1169                 ret = HTTP_ERROR;
1170                 goto cleanup;
1171         }
1172
1173         ret = http_request_reauth(url, result, HTTP_REQUEST_FILE, options);
1174         fclose(result);
1175
1176         if (ret == HTTP_OK && move_temp_to_file(tmpfile.buf, filename))
1177                 ret = HTTP_ERROR;
1178 cleanup:
1179         strbuf_release(&tmpfile);
1180         return ret;
1181 }
1182
1183 int http_fetch_ref(const char *base, struct ref *ref)
1184 {
1185         struct http_get_options options = {0};
1186         char *url;
1187         struct strbuf buffer = STRBUF_INIT;
1188         int ret = -1;
1189
1190         options.no_cache = 1;
1191
1192         url = quote_ref_url(base, ref->name);
1193         if (http_get_strbuf(url, &buffer, &options) == HTTP_OK) {
1194                 strbuf_rtrim(&buffer);
1195                 if (buffer.len == 40)
1196                         ret = get_sha1_hex(buffer.buf, ref->old_sha1);
1197                 else if (starts_with(buffer.buf, "ref: ")) {
1198                         ref->symref = xstrdup(buffer.buf + 5);
1199                         ret = 0;
1200                 }
1201         }
1202
1203         strbuf_release(&buffer);
1204         free(url);
1205         return ret;
1206 }
1207
1208 /* Helpers for fetching packs */
1209 static char *fetch_pack_index(unsigned char *sha1, const char *base_url)
1210 {
1211         char *url, *tmp;
1212         struct strbuf buf = STRBUF_INIT;
1213
1214         if (http_is_verbose)
1215                 fprintf(stderr, "Getting index for pack %s\n", sha1_to_hex(sha1));
1216
1217         end_url_with_slash(&buf, base_url);
1218         strbuf_addf(&buf, "objects/pack/pack-%s.idx", sha1_to_hex(sha1));
1219         url = strbuf_detach(&buf, NULL);
1220
1221         strbuf_addf(&buf, "%s.temp", sha1_pack_index_name(sha1));
1222         tmp = strbuf_detach(&buf, NULL);
1223
1224         if (http_get_file(url, tmp, NULL) != HTTP_OK) {
1225                 error("Unable to get pack index %s", url);
1226                 free(tmp);
1227                 tmp = NULL;
1228         }
1229
1230         free(url);
1231         return tmp;
1232 }
1233
1234 static int fetch_and_setup_pack_index(struct packed_git **packs_head,
1235         unsigned char *sha1, const char *base_url)
1236 {
1237         struct packed_git *new_pack;
1238         char *tmp_idx = NULL;
1239         int ret;
1240
1241         if (has_pack_index(sha1)) {
1242                 new_pack = parse_pack_index(sha1, NULL);
1243                 if (!new_pack)
1244                         return -1; /* parse_pack_index() already issued error message */
1245                 goto add_pack;
1246         }
1247
1248         tmp_idx = fetch_pack_index(sha1, base_url);
1249         if (!tmp_idx)
1250                 return -1;
1251
1252         new_pack = parse_pack_index(sha1, tmp_idx);
1253         if (!new_pack) {
1254                 unlink(tmp_idx);
1255                 free(tmp_idx);
1256
1257                 return -1; /* parse_pack_index() already issued error message */
1258         }
1259
1260         ret = verify_pack_index(new_pack);
1261         if (!ret) {
1262                 close_pack_index(new_pack);
1263                 ret = move_temp_to_file(tmp_idx, sha1_pack_index_name(sha1));
1264         }
1265         free(tmp_idx);
1266         if (ret)
1267                 return -1;
1268
1269 add_pack:
1270         new_pack->next = *packs_head;
1271         *packs_head = new_pack;
1272         return 0;
1273 }
1274
1275 int http_get_info_packs(const char *base_url, struct packed_git **packs_head)
1276 {
1277         struct http_get_options options = {0};
1278         int ret = 0, i = 0;
1279         char *url, *data;
1280         struct strbuf buf = STRBUF_INIT;
1281         unsigned char sha1[20];
1282
1283         end_url_with_slash(&buf, base_url);
1284         strbuf_addstr(&buf, "objects/info/packs");
1285         url = strbuf_detach(&buf, NULL);
1286
1287         options.no_cache = 1;
1288         ret = http_get_strbuf(url, &buf, &options);
1289         if (ret != HTTP_OK)
1290                 goto cleanup;
1291
1292         data = buf.buf;
1293         while (i < buf.len) {
1294                 switch (data[i]) {
1295                 case 'P':
1296                         i++;
1297                         if (i + 52 <= buf.len &&
1298                             starts_with(data + i, " pack-") &&
1299                             starts_with(data + i + 46, ".pack\n")) {
1300                                 get_sha1_hex(data + i + 6, sha1);
1301                                 fetch_and_setup_pack_index(packs_head, sha1,
1302                                                       base_url);
1303                                 i += 51;
1304                                 break;
1305                         }
1306                 default:
1307                         while (i < buf.len && data[i] != '\n')
1308                                 i++;
1309                 }
1310                 i++;
1311         }
1312
1313 cleanup:
1314         free(url);
1315         return ret;
1316 }
1317
1318 void release_http_pack_request(struct http_pack_request *preq)
1319 {
1320         if (preq->packfile != NULL) {
1321                 fclose(preq->packfile);
1322                 preq->packfile = NULL;
1323         }
1324         if (preq->range_header != NULL) {
1325                 curl_slist_free_all(preq->range_header);
1326                 preq->range_header = NULL;
1327         }
1328         preq->slot = NULL;
1329         free(preq->url);
1330 }
1331
1332 int finish_http_pack_request(struct http_pack_request *preq)
1333 {
1334         struct packed_git **lst;
1335         struct packed_git *p = preq->target;
1336         char *tmp_idx;
1337         struct child_process ip = CHILD_PROCESS_INIT;
1338         const char *ip_argv[8];
1339
1340         close_pack_index(p);
1341
1342         fclose(preq->packfile);
1343         preq->packfile = NULL;
1344
1345         lst = preq->lst;
1346         while (*lst != p)
1347                 lst = &((*lst)->next);
1348         *lst = (*lst)->next;
1349
1350         tmp_idx = xstrdup(preq->tmpfile);
1351         strcpy(tmp_idx + strlen(tmp_idx) - strlen(".pack.temp"),
1352                ".idx.temp");
1353
1354         ip_argv[0] = "index-pack";
1355         ip_argv[1] = "-o";
1356         ip_argv[2] = tmp_idx;
1357         ip_argv[3] = preq->tmpfile;
1358         ip_argv[4] = NULL;
1359
1360         ip.argv = ip_argv;
1361         ip.git_cmd = 1;
1362         ip.no_stdin = 1;
1363         ip.no_stdout = 1;
1364
1365         if (run_command(&ip)) {
1366                 unlink(preq->tmpfile);
1367                 unlink(tmp_idx);
1368                 free(tmp_idx);
1369                 return -1;
1370         }
1371
1372         unlink(sha1_pack_index_name(p->sha1));
1373
1374         if (move_temp_to_file(preq->tmpfile, sha1_pack_name(p->sha1))
1375          || move_temp_to_file(tmp_idx, sha1_pack_index_name(p->sha1))) {
1376                 free(tmp_idx);
1377                 return -1;
1378         }
1379
1380         install_packed_git(p);
1381         free(tmp_idx);
1382         return 0;
1383 }
1384
1385 struct http_pack_request *new_http_pack_request(
1386         struct packed_git *target, const char *base_url)
1387 {
1388         long prev_posn = 0;
1389         char range[RANGE_HEADER_SIZE];
1390         struct strbuf buf = STRBUF_INIT;
1391         struct http_pack_request *preq;
1392
1393         preq = xcalloc(1, sizeof(*preq));
1394         preq->target = target;
1395
1396         end_url_with_slash(&buf, base_url);
1397         strbuf_addf(&buf, "objects/pack/pack-%s.pack",
1398                 sha1_to_hex(target->sha1));
1399         preq->url = strbuf_detach(&buf, NULL);
1400
1401         snprintf(preq->tmpfile, sizeof(preq->tmpfile), "%s.temp",
1402                 sha1_pack_name(target->sha1));
1403         preq->packfile = fopen(preq->tmpfile, "a");
1404         if (!preq->packfile) {
1405                 error("Unable to open local file %s for pack",
1406                       preq->tmpfile);
1407                 goto abort;
1408         }
1409
1410         preq->slot = get_active_slot();
1411         curl_easy_setopt(preq->slot->curl, CURLOPT_FILE, preq->packfile);
1412         curl_easy_setopt(preq->slot->curl, CURLOPT_WRITEFUNCTION, fwrite);
1413         curl_easy_setopt(preq->slot->curl, CURLOPT_URL, preq->url);
1414         curl_easy_setopt(preq->slot->curl, CURLOPT_HTTPHEADER,
1415                 no_pragma_header);
1416
1417         /*
1418          * If there is data present from a previous transfer attempt,
1419          * resume where it left off
1420          */
1421         prev_posn = ftell(preq->packfile);
1422         if (prev_posn>0) {
1423                 if (http_is_verbose)
1424                         fprintf(stderr,
1425                                 "Resuming fetch of pack %s at byte %ld\n",
1426                                 sha1_to_hex(target->sha1), prev_posn);
1427                 sprintf(range, "Range: bytes=%ld-", prev_posn);
1428                 preq->range_header = curl_slist_append(NULL, range);
1429                 curl_easy_setopt(preq->slot->curl, CURLOPT_HTTPHEADER,
1430                         preq->range_header);
1431         }
1432
1433         return preq;
1434
1435 abort:
1436         free(preq->url);
1437         free(preq);
1438         return NULL;
1439 }
1440
1441 /* Helpers for fetching objects (loose) */
1442 static size_t fwrite_sha1_file(char *ptr, size_t eltsize, size_t nmemb,
1443                                void *data)
1444 {
1445         unsigned char expn[4096];
1446         size_t size = eltsize * nmemb;
1447         int posn = 0;
1448         struct http_object_request *freq =
1449                 (struct http_object_request *)data;
1450         do {
1451                 ssize_t retval = xwrite(freq->localfile,
1452                                         (char *) ptr + posn, size - posn);
1453                 if (retval < 0)
1454                         return posn;
1455                 posn += retval;
1456         } while (posn < size);
1457
1458         freq->stream.avail_in = size;
1459         freq->stream.next_in = (void *)ptr;
1460         do {
1461                 freq->stream.next_out = expn;
1462                 freq->stream.avail_out = sizeof(expn);
1463                 freq->zret = git_inflate(&freq->stream, Z_SYNC_FLUSH);
1464                 git_SHA1_Update(&freq->c, expn,
1465                                 sizeof(expn) - freq->stream.avail_out);
1466         } while (freq->stream.avail_in && freq->zret == Z_OK);
1467         return size;
1468 }
1469
1470 struct http_object_request *new_http_object_request(const char *base_url,
1471         unsigned char *sha1)
1472 {
1473         char *hex = sha1_to_hex(sha1);
1474         const char *filename;
1475         char prevfile[PATH_MAX];
1476         int prevlocal;
1477         char prev_buf[PREV_BUF_SIZE];
1478         ssize_t prev_read = 0;
1479         long prev_posn = 0;
1480         char range[RANGE_HEADER_SIZE];
1481         struct curl_slist *range_header = NULL;
1482         struct http_object_request *freq;
1483
1484         freq = xcalloc(1, sizeof(*freq));
1485         hashcpy(freq->sha1, sha1);
1486         freq->localfile = -1;
1487
1488         filename = sha1_file_name(sha1);
1489         snprintf(freq->tmpfile, sizeof(freq->tmpfile),
1490                  "%s.temp", filename);
1491
1492         snprintf(prevfile, sizeof(prevfile), "%s.prev", filename);
1493         unlink_or_warn(prevfile);
1494         rename(freq->tmpfile, prevfile);
1495         unlink_or_warn(freq->tmpfile);
1496
1497         if (freq->localfile != -1)
1498                 error("fd leakage in start: %d", freq->localfile);
1499         freq->localfile = open(freq->tmpfile,
1500                                O_WRONLY | O_CREAT | O_EXCL, 0666);
1501         /*
1502          * This could have failed due to the "lazy directory creation";
1503          * try to mkdir the last path component.
1504          */
1505         if (freq->localfile < 0 && errno == ENOENT) {
1506                 char *dir = strrchr(freq->tmpfile, '/');
1507                 if (dir) {
1508                         *dir = 0;
1509                         mkdir(freq->tmpfile, 0777);
1510                         *dir = '/';
1511                 }
1512                 freq->localfile = open(freq->tmpfile,
1513                                        O_WRONLY | O_CREAT | O_EXCL, 0666);
1514         }
1515
1516         if (freq->localfile < 0) {
1517                 error("Couldn't create temporary file %s: %s",
1518                       freq->tmpfile, strerror(errno));
1519                 goto abort;
1520         }
1521
1522         git_inflate_init(&freq->stream);
1523
1524         git_SHA1_Init(&freq->c);
1525
1526         freq->url = get_remote_object_url(base_url, hex, 0);
1527
1528         /*
1529          * If a previous temp file is present, process what was already
1530          * fetched.
1531          */
1532         prevlocal = open(prevfile, O_RDONLY);
1533         if (prevlocal != -1) {
1534                 do {
1535                         prev_read = xread(prevlocal, prev_buf, PREV_BUF_SIZE);
1536                         if (prev_read>0) {
1537                                 if (fwrite_sha1_file(prev_buf,
1538                                                      1,
1539                                                      prev_read,
1540                                                      freq) == prev_read) {
1541                                         prev_posn += prev_read;
1542                                 } else {
1543                                         prev_read = -1;
1544                                 }
1545                         }
1546                 } while (prev_read > 0);
1547                 close(prevlocal);
1548         }
1549         unlink_or_warn(prevfile);
1550
1551         /*
1552          * Reset inflate/SHA1 if there was an error reading the previous temp
1553          * file; also rewind to the beginning of the local file.
1554          */
1555         if (prev_read == -1) {
1556                 memset(&freq->stream, 0, sizeof(freq->stream));
1557                 git_inflate_init(&freq->stream);
1558                 git_SHA1_Init(&freq->c);
1559                 if (prev_posn>0) {
1560                         prev_posn = 0;
1561                         lseek(freq->localfile, 0, SEEK_SET);
1562                         if (ftruncate(freq->localfile, 0) < 0) {
1563                                 error("Couldn't truncate temporary file %s: %s",
1564                                           freq->tmpfile, strerror(errno));
1565                                 goto abort;
1566                         }
1567                 }
1568         }
1569
1570         freq->slot = get_active_slot();
1571
1572         curl_easy_setopt(freq->slot->curl, CURLOPT_FILE, freq);
1573         curl_easy_setopt(freq->slot->curl, CURLOPT_WRITEFUNCTION, fwrite_sha1_file);
1574         curl_easy_setopt(freq->slot->curl, CURLOPT_ERRORBUFFER, freq->errorstr);
1575         curl_easy_setopt(freq->slot->curl, CURLOPT_URL, freq->url);
1576         curl_easy_setopt(freq->slot->curl, CURLOPT_HTTPHEADER, no_pragma_header);
1577
1578         /*
1579          * If we have successfully processed data from a previous fetch
1580          * attempt, only fetch the data we don't already have.
1581          */
1582         if (prev_posn>0) {
1583                 if (http_is_verbose)
1584                         fprintf(stderr,
1585                                 "Resuming fetch of object %s at byte %ld\n",
1586                                 hex, prev_posn);
1587                 sprintf(range, "Range: bytes=%ld-", prev_posn);
1588                 range_header = curl_slist_append(range_header, range);
1589                 curl_easy_setopt(freq->slot->curl,
1590                                  CURLOPT_HTTPHEADER, range_header);
1591         }
1592
1593         return freq;
1594
1595 abort:
1596         free(freq->url);
1597         free(freq);
1598         return NULL;
1599 }
1600
1601 void process_http_object_request(struct http_object_request *freq)
1602 {
1603         if (freq->slot == NULL)
1604                 return;
1605         freq->curl_result = freq->slot->curl_result;
1606         freq->http_code = freq->slot->http_code;
1607         freq->slot = NULL;
1608 }
1609
1610 int finish_http_object_request(struct http_object_request *freq)
1611 {
1612         struct stat st;
1613
1614         close(freq->localfile);
1615         freq->localfile = -1;
1616
1617         process_http_object_request(freq);
1618
1619         if (freq->http_code == 416) {
1620                 warning("requested range invalid; we may already have all the data.");
1621         } else if (freq->curl_result != CURLE_OK) {
1622                 if (stat(freq->tmpfile, &st) == 0)
1623                         if (st.st_size == 0)
1624                                 unlink_or_warn(freq->tmpfile);
1625                 return -1;
1626         }
1627
1628         git_inflate_end(&freq->stream);
1629         git_SHA1_Final(freq->real_sha1, &freq->c);
1630         if (freq->zret != Z_STREAM_END) {
1631                 unlink_or_warn(freq->tmpfile);
1632                 return -1;
1633         }
1634         if (hashcmp(freq->sha1, freq->real_sha1)) {
1635                 unlink_or_warn(freq->tmpfile);
1636                 return -1;
1637         }
1638         freq->rename =
1639                 move_temp_to_file(freq->tmpfile, sha1_file_name(freq->sha1));
1640
1641         return freq->rename;
1642 }
1643
1644 void abort_http_object_request(struct http_object_request *freq)
1645 {
1646         unlink_or_warn(freq->tmpfile);
1647
1648         release_http_object_request(freq);
1649 }
1650
1651 void release_http_object_request(struct http_object_request *freq)
1652 {
1653         if (freq->localfile != -1) {
1654                 close(freq->localfile);
1655                 freq->localfile = -1;
1656         }
1657         if (freq->url != NULL) {
1658                 free(freq->url);
1659                 freq->url = NULL;
1660         }
1661         if (freq->slot != NULL) {
1662                 freq->slot->callback_func = NULL;
1663                 freq->slot->callback_data = NULL;
1664                 release_active_slot(freq->slot);
1665                 freq->slot = NULL;
1666         }
1667 }