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

   1 #include "git-compat-util.h"
   2 #include "http.h"
   3 #include "pack.h"
   4 #include "sideband.h"
   5 #include "run-command.h"
   6 #include "url.h"
   7 #include "urlmatch.h"
   8 #include "credential.h"
   9 #include "version.h"
  10 #include "pkt-line.h"
  11 #include "transport.h"
  12
  13 int active_requests;
  14 int http_is_verbose;
  15 size_t http_post_buffer = 16 * LARGE_PACKET_MAX;
  16
  17 #if LIBCURL_VERSION_NUM >= 0x070a06
  18 #define LIBCURL_CAN_HANDLE_AUTH_ANY
  19 #endif
  20
  21 static int min_curl_sessions = 1;
  22 static int curl_session_count;
  23 #ifdef USE_CURL_MULTI
  24 static int max_requests = -1;
  25 static CURLM *curlm;
  26 #endif
  27 #ifndef NO_CURL_EASY_DUPHANDLE
  28 static CURL *curl_default;
  29 #endif
  30
  31 #define PREV_BUF_SIZE 4096
  32 #define RANGE_HEADER_SIZE 30
  33
  34 char curl_errorstr[CURL_ERROR_SIZE];
  35
  36 static int curl_ssl_verify = -1;
  37 static int curl_ssl_try;
  38 static const char *ssl_cert;
  39 #if LIBCURL_VERSION_NUM >= 0x070903
  40 static const char *ssl_key;
  41 #endif
  42 #if LIBCURL_VERSION_NUM >= 0x070908
  43 static const char *ssl_capath;
  44 #endif
  45 static const char *ssl_cainfo;
  46 static long curl_low_speed_limit = -1;
  47 static long curl_low_speed_time = -1;
  48 static int curl_ftp_no_epsv;
  49 static const char *curl_http_proxy;
  50 static const char *curl_cookie_file;
  51 static int curl_save_cookies;
  52 struct credential http_auth = CREDENTIAL_INIT;
  53 static int http_proactive_auth;
  54 static const char *user_agent;
  55
  56 #if LIBCURL_VERSION_NUM >= 0x071700
  57 /* Use CURLOPT_KEYPASSWD as is */
  58 #elif LIBCURL_VERSION_NUM >= 0x070903
  59 #define CURLOPT_KEYPASSWD CURLOPT_SSLKEYPASSWD
  60 #else
  61 #define CURLOPT_KEYPASSWD CURLOPT_SSLCERTPASSWD
  62 #endif
  63
  64 static struct credential cert_auth = CREDENTIAL_INIT;
  65 static int ssl_cert_password_required;
  66 #ifdef LIBCURL_CAN_HANDLE_AUTH_ANY
  67 static unsigned long http_auth_methods = CURLAUTH_ANY;
  68 #endif
  69
  70 static struct curl_slist *pragma_header;
  71 static struct curl_slist *no_pragma_header;
  72
  73 static struct active_request_slot *active_queue_head;
  74
  75 size_t fread_buffer(char *ptr, size_t eltsize, size_t nmemb, void *buffer_)
  76 {
  77         size_t size = eltsize * nmemb;
  78         struct buffer *buffer = buffer_;
  79
  80         if (size > buffer->buf.len - buffer->posn)
  81                 size = buffer->buf.len - buffer->posn;
  82         memcpy(ptr, buffer->buf.buf + buffer->posn, size);
  83         buffer->posn += size;
  84
  85         return size;
  86 }
  87
  88 #ifndef NO_CURL_IOCTL
  89 curlioerr ioctl_buffer(CURL *handle, int cmd, void *clientp)
  90 {
  91         struct buffer *buffer = clientp;
  92
  93         switch (cmd) {
  94         case CURLIOCMD_NOP:
  95                 return CURLIOE_OK;
  96
  97         case CURLIOCMD_RESTARTREAD:
  98                 buffer->posn = 0;
  99                 return CURLIOE_OK;
 100
 101         default:
 102                 return CURLIOE_UNKNOWNCMD;
 103         }
 104 }
 105 #endif
 106
 107 size_t fwrite_buffer(char *ptr, size_t eltsize, size_t nmemb, void *buffer_)
 108 {
 109         size_t size = eltsize * nmemb;
 110         struct strbuf *buffer = buffer_;
 111
 112         strbuf_add(buffer, ptr, size);
 113         return size;
 114 }
 115
 116 size_t fwrite_null(char *ptr, size_t eltsize, size_t nmemb, void *strbuf)
 117 {
 118         return eltsize * nmemb;
 119 }
 120
 121 #ifdef USE_CURL_MULTI
 122 static void process_curl_messages(void)
 123 {
 124         int num_messages;
 125         struct active_request_slot *slot;
 126         CURLMsg *curl_message = curl_multi_info_read(curlm, &num_messages);
 127
 128         while (curl_message != NULL) {
 129                 if (curl_message->msg == CURLMSG_DONE) {
 130                         int curl_result = curl_message->data.result;
 131                         slot = active_queue_head;
 132                         while (slot != NULL &&
 133                                slot->curl != curl_message->easy_handle)
 134                                 slot = slot->next;
 135                         if (slot != NULL) {
 136                                 curl_multi_remove_handle(curlm, slot->curl);
 137                                 slot->curl_result = curl_result;
 138                                 finish_active_slot(slot);
 139                         } else {
 140                                 fprintf(stderr, "Received DONE message for unknown request!\n");
 141                         }
 142                 } else {
 143                         fprintf(stderr, "Unknown CURL message received: %d\n",
 144                                 (int)curl_message->msg);
 145                 }
 146                 curl_message = curl_multi_info_read(curlm, &num_messages);
 147         }
 148 }
 149 #endif
 150
 151 static int http_options(const char *var, const char *value, void *cb)
 152 {
 153         if (!strcmp("http.sslverify", var)) {
 154                 curl_ssl_verify = git_config_bool(var, value);
 155                 return 0;
 156         }
 157         if (!strcmp("http.sslcert", var))
 158                 return git_config_string(&ssl_cert, var, value);
 159 #if LIBCURL_VERSION_NUM >= 0x070903
 160         if (!strcmp("http.sslkey", var))
 161                 return git_config_string(&ssl_key, var, value);
 162 #endif
 163 #if LIBCURL_VERSION_NUM >= 0x070908
 164         if (!strcmp("http.sslcapath", var))
 165                 return git_config_string(&ssl_capath, var, value);
 166 #endif
 167         if (!strcmp("http.sslcainfo", var))
 168                 return git_config_string(&ssl_cainfo, var, value);
 169         if (!strcmp("http.sslcertpasswordprotected", var)) {
 170                 ssl_cert_password_required = git_config_bool(var, value);
 171                 return 0;
 172         }
 173         if (!strcmp("http.ssltry", var)) {
 174                 curl_ssl_try = git_config_bool(var, value);
 175                 return 0;
 176         }
 177         if (!strcmp("http.minsessions", var)) {
 178                 min_curl_sessions = git_config_int(var, value);
 179 #ifndef USE_CURL_MULTI
 180                 if (min_curl_sessions > 1)
 181                         min_curl_sessions = 1;
 182 #endif
 183                 return 0;
 184         }
 185 #ifdef USE_CURL_MULTI
 186         if (!strcmp("http.maxrequests", var)) {
 187                 max_requests = git_config_int(var, value);
 188                 return 0;
 189         }
 190 #endif
 191         if (!strcmp("http.lowspeedlimit", var)) {
 192                 curl_low_speed_limit = (long)git_config_int(var, value);
 193                 return 0;
 194         }
 195         if (!strcmp("http.lowspeedtime", var)) {
 196                 curl_low_speed_time = (long)git_config_int(var, value);
 197                 return 0;
 198         }
 199
 200         if (!strcmp("http.noepsv", var)) {
 201                 curl_ftp_no_epsv = git_config_bool(var, value);
 202                 return 0;
 203         }
 204         if (!strcmp("http.proxy", var))
 205                 return git_config_string(&curl_http_proxy, var, value);
 206
 207         if (!strcmp("http.cookiefile", var))
 208                 return git_config_string(&curl_cookie_file, var, value);
 209         if (!strcmp("http.savecookies", var)) {
 210                 curl_save_cookies = git_config_bool(var, value);
 211                 return 0;
 212         }
 213
 214         if (!strcmp("http.postbuffer", var)) {
 215                 http_post_buffer = git_config_int(var, value);
 216                 if (http_post_buffer < LARGE_PACKET_MAX)
 217                         http_post_buffer = LARGE_PACKET_MAX;
 218                 return 0;
 219         }
 220
 221         if (!strcmp("http.useragent", var))
 222                 return git_config_string(&user_agent, var, value);
 223
 224         /* Fall back on the default ones */
 225         return git_default_config(var, value, cb);
 226 }
 227
 228 static void init_curl_http_auth(CURL *result)
 229 {
 230         if (!http_auth.username)
 231                 return;
 232
 233         credential_fill(&http_auth);
 234
 235 #if LIBCURL_VERSION_NUM >= 0x071301
 236         curl_easy_setopt(result, CURLOPT_USERNAME, http_auth.username);
 237         curl_easy_setopt(result, CURLOPT_PASSWORD, http_auth.password);
 238 #else
 239         {
 240                 static struct strbuf up = STRBUF_INIT;
 241                 /*
 242                  * Note that we assume we only ever have a single set of
 243                  * credentials in a given program run, so we do not have
 244                  * to worry about updating this buffer, only setting its
 245                  * initial value.
 246                  */
 247                 if (!up.len)
 248                         strbuf_addf(&up, "%s:%s",
 249                                 http_auth.username, http_auth.password);
 250                 curl_easy_setopt(result, CURLOPT_USERPWD, up.buf);
 251         }
 252 #endif
 253 }
 254
 255 static int has_cert_password(void)
 256 {
 257         if (ssl_cert == NULL || ssl_cert_password_required != 1)
 258                 return 0;
 259         if (!cert_auth.password) {
 260                 cert_auth.protocol = xstrdup("cert");
 261                 cert_auth.username = xstrdup("");
 262                 cert_auth.path = xstrdup(ssl_cert);
 263                 credential_fill(&cert_auth);
 264         }
 265         return 1;
 266 }
 267
 268 #if LIBCURL_VERSION_NUM >= 0x071900
 269 static void set_curl_keepalive(CURL *c)
 270 {
 271         curl_easy_setopt(c, CURLOPT_TCP_KEEPALIVE, 1);
 272 }
 273
 274 #elif LIBCURL_VERSION_NUM >= 0x071000
 275 static int sockopt_callback(void *client, curl_socket_t fd, curlsocktype type)
 276 {
 277         int ka = 1;
 278         int rc;
 279         socklen_t len = (socklen_t)sizeof(ka);
 280
 281         if (type != CURLSOCKTYPE_IPCXN)
 282                 return 0;
 283
 284         rc = setsockopt(fd, SOL_SOCKET, SO_KEEPALIVE, (void *)&ka, len);
 285         if (rc < 0)
 286                 warning("unable to set SO_KEEPALIVE on socket %s",
 287                         strerror(errno));
 288
 289         return 0; /* CURL_SOCKOPT_OK only exists since curl 7.21.5 */
 290 }
 291
 292 static void set_curl_keepalive(CURL *c)
 293 {
 294         curl_easy_setopt(c, CURLOPT_SOCKOPTFUNCTION, sockopt_callback);
 295 }
 296
 297 #else
 298 static void set_curl_keepalive(CURL *c)
 299 {
 300         /* not supported on older curl versions */
 301 }
 302 #endif
 303
 304 static CURL *get_curl_handle(void)
 305 {
 306         CURL *result = curl_easy_init();
 307         long allowed_protocols = 0;
 308
 309         if (!result)
 310                 die("curl_easy_init failed");
 311
 312         if (!curl_ssl_verify) {
 313                 curl_easy_setopt(result, CURLOPT_SSL_VERIFYPEER, 0);
 314                 curl_easy_setopt(result, CURLOPT_SSL_VERIFYHOST, 0);
 315         } else {
 316                 /* Verify authenticity of the peer's certificate */
 317                 curl_easy_setopt(result, CURLOPT_SSL_VERIFYPEER, 1);
 318                 /* The name in the cert must match whom we tried to connect */
 319                 curl_easy_setopt(result, CURLOPT_SSL_VERIFYHOST, 2);
 320         }
 321
 322 #if LIBCURL_VERSION_NUM >= 0x070907
 323         curl_easy_setopt(result, CURLOPT_NETRC, CURL_NETRC_OPTIONAL);
 324 #endif
 325 #ifdef LIBCURL_CAN_HANDLE_AUTH_ANY
 326         curl_easy_setopt(result, CURLOPT_HTTPAUTH, CURLAUTH_ANY);
 327 #endif
 328
 329         if (http_proactive_auth)
 330                 init_curl_http_auth(result);
 331
 332         if (ssl_cert != NULL)
 333                 curl_easy_setopt(result, CURLOPT_SSLCERT, ssl_cert);
 334         if (has_cert_password())
 335                 curl_easy_setopt(result, CURLOPT_KEYPASSWD, cert_auth.password);
 336 #if LIBCURL_VERSION_NUM >= 0x070903
 337         if (ssl_key != NULL)
 338                 curl_easy_setopt(result, CURLOPT_SSLKEY, ssl_key);
 339 #endif
 340 #if LIBCURL_VERSION_NUM >= 0x070908
 341         if (ssl_capath != NULL)
 342                 curl_easy_setopt(result, CURLOPT_CAPATH, ssl_capath);
 343 #endif
 344         if (ssl_cainfo != NULL)
 345                 curl_easy_setopt(result, CURLOPT_CAINFO, ssl_cainfo);
 346
 347         if (curl_low_speed_limit > 0 && curl_low_speed_time > 0) {
 348                 curl_easy_setopt(result, CURLOPT_LOW_SPEED_LIMIT,
 349                                  curl_low_speed_limit);
 350                 curl_easy_setopt(result, CURLOPT_LOW_SPEED_TIME,
 351                                  curl_low_speed_time);
 352         }
 353
 354         curl_easy_setopt(result, CURLOPT_FOLLOWLOCATION, 1);
 355 #if LIBCURL_VERSION_NUM >= 0x071301
 356         curl_easy_setopt(result, CURLOPT_POSTREDIR, CURL_REDIR_POST_ALL);
 357 #elif LIBCURL_VERSION_NUM >= 0x071101
 358         curl_easy_setopt(result, CURLOPT_POST301, 1);
 359 #endif
 360 #if LIBCURL_VERSION_NUM >= 0x071304
 361         if (is_transport_allowed("http"))
 362                 allowed_protocols |= CURLPROTO_HTTP;
 363         if (is_transport_allowed("https"))
 364                 allowed_protocols |= CURLPROTO_HTTPS;
 365         if (is_transport_allowed("ftp"))
 366                 allowed_protocols |= CURLPROTO_FTP;
 367         if (is_transport_allowed("ftps"))
 368                 allowed_protocols |= CURLPROTO_FTPS;
 369         curl_easy_setopt(result, CURLOPT_REDIR_PROTOCOLS, allowed_protocols);
 370 #else
 371         if (transport_restrict_protocols())
 372                 warning("protocol restrictions not applied to curl redirects because\n"
 373                         "your curl version is too old (>= 7.19.4)");
 374 #endif
 375
 376         if (getenv("GIT_CURL_VERBOSE"))
 377                 curl_easy_setopt(result, CURLOPT_VERBOSE, 1);
 378
 379         curl_easy_setopt(result, CURLOPT_USERAGENT,
 380                 user_agent ? user_agent : git_user_agent());
 381
 382         if (curl_ftp_no_epsv)
 383                 curl_easy_setopt(result, CURLOPT_FTP_USE_EPSV, 0);
 384
 385 #ifdef CURLOPT_USE_SSL
 386         if (curl_ssl_try)
 387                 curl_easy_setopt(result, CURLOPT_USE_SSL, CURLUSESSL_TRY);
 388 #endif
 389
 390         if (curl_http_proxy) {
 391                 curl_easy_setopt(result, CURLOPT_PROXY, curl_http_proxy);
 392                 curl_easy_setopt(result, CURLOPT_PROXYAUTH, CURLAUTH_ANY);
 393         }
 394
 395         set_curl_keepalive(result);
 396
 397         return result;
 398 }
 399
 400 static void set_from_env(const char **var, const char *envname)
 401 {
 402         const char *val = getenv(envname);
 403         if (val)
 404                 *var = val;
 405 }
 406
 407 void http_init(struct remote *remote, const char *url, int proactive_auth)
 408 {
 409         char *low_speed_limit;
 410         char *low_speed_time;
 411         char *normalized_url;
 412         struct urlmatch_config config = { STRING_LIST_INIT_DUP };
 413
 414         config.section = "http";
 415         config.key = NULL;
 416         config.collect_fn = http_options;
 417         config.cascade_fn = git_default_config;
 418         config.cb = NULL;
 419
 420         http_is_verbose = 0;
 421         normalized_url = url_normalize(url, &config.url);
 422
 423         git_config(urlmatch_config_entry, &config);
 424         free(normalized_url);
 425
 426         if (curl_global_init(CURL_GLOBAL_ALL) != CURLE_OK)
 427                 die("curl_global_init failed");
 428
 429         http_proactive_auth = proactive_auth;
 430
 431         if (remote && remote->http_proxy)
 432                 curl_http_proxy = xstrdup(remote->http_proxy);
 433
 434         pragma_header = curl_slist_append(pragma_header, "Pragma: no-cache");
 435         no_pragma_header = curl_slist_append(no_pragma_header, "Pragma:");
 436
 437 #ifdef USE_CURL_MULTI
 438         {
 439                 char *http_max_requests = getenv("GIT_HTTP_MAX_REQUESTS");
 440                 if (http_max_requests != NULL)
 441                         max_requests = atoi(http_max_requests);
 442         }
 443
 444         curlm = curl_multi_init();
 445         if (!curlm)
 446                 die("curl_multi_init failed");
 447 #endif
 448
 449         if (getenv("GIT_SSL_NO_VERIFY"))
 450                 curl_ssl_verify = 0;
 451
 452         set_from_env(&ssl_cert, "GIT_SSL_CERT");
 453 #if LIBCURL_VERSION_NUM >= 0x070903
 454         set_from_env(&ssl_key, "GIT_SSL_KEY");
 455 #endif
 456 #if LIBCURL_VERSION_NUM >= 0x070908
 457         set_from_env(&ssl_capath, "GIT_SSL_CAPATH");
 458 #endif
 459         set_from_env(&ssl_cainfo, "GIT_SSL_CAINFO");
 460
 461         set_from_env(&user_agent, "GIT_HTTP_USER_AGENT");
 462
 463         low_speed_limit = getenv("GIT_HTTP_LOW_SPEED_LIMIT");
 464         if (low_speed_limit != NULL)
 465                 curl_low_speed_limit = strtol(low_speed_limit, NULL, 10);
 466         low_speed_time = getenv("GIT_HTTP_LOW_SPEED_TIME");
 467         if (low_speed_time != NULL)
 468                 curl_low_speed_time = strtol(low_speed_time, NULL, 10);
 469
 470         if (curl_ssl_verify == -1)
 471                 curl_ssl_verify = 1;
 472
 473         curl_session_count = 0;
 474 #ifdef USE_CURL_MULTI
 475         if (max_requests < 1)
 476                 max_requests = DEFAULT_MAX_REQUESTS;
 477 #endif
 478
 479         if (getenv("GIT_CURL_FTP_NO_EPSV"))
 480                 curl_ftp_no_epsv = 1;
 481
 482         if (url) {
 483                 credential_from_url(&http_auth, url);
 484                 if (!ssl_cert_password_required &&
 485                     getenv("GIT_SSL_CERT_PASSWORD_PROTECTED") &&
 486                     starts_with(url, "https://"))
 487                         ssl_cert_password_required = 1;
 488         }
 489
 490 #ifndef NO_CURL_EASY_DUPHANDLE
 491         curl_default = get_curl_handle();
 492 #endif
 493 }
 494
 495 void http_cleanup(void)
 496 {
 497         struct active_request_slot *slot = active_queue_head;
 498
 499         while (slot != NULL) {
 500                 struct active_request_slot *next = slot->next;
 501                 if (slot->curl != NULL) {
 502 #ifdef USE_CURL_MULTI
 503                         curl_multi_remove_handle(curlm, slot->curl);
 504 #endif
 505                         curl_easy_cleanup(slot->curl);
 506                 }
 507                 free(slot);
 508                 slot = next;
 509         }
 510         active_queue_head = NULL;
 511
 512 #ifndef NO_CURL_EASY_DUPHANDLE
 513         curl_easy_cleanup(curl_default);
 514 #endif
 515
 516 #ifdef USE_CURL_MULTI
 517         curl_multi_cleanup(curlm);
 518 #endif
 519         curl_global_cleanup();
 520
 521         curl_slist_free_all(pragma_header);
 522         pragma_header = NULL;
 523
 524         curl_slist_free_all(no_pragma_header);
 525         no_pragma_header = NULL;
 526
 527         if (curl_http_proxy) {
 528                 free((void *)curl_http_proxy);
 529                 curl_http_proxy = NULL;
 530         }
 531
 532         if (cert_auth.password != NULL) {
 533                 memset(cert_auth.password, 0, strlen(cert_auth.password));
 534                 free(cert_auth.password);
 535                 cert_auth.password = NULL;
 536         }
 537         ssl_cert_password_required = 0;
 538 }
 539
 540 struct active_request_slot *get_active_slot(void)
 541 {
 542         struct active_request_slot *slot = active_queue_head;
 543         struct active_request_slot *newslot;
 544
 545 #ifdef USE_CURL_MULTI
 546         int num_transfers;
 547
 548         /* Wait for a slot to open up if the queue is full */
 549         while (active_requests >= max_requests) {
 550                 curl_multi_perform(curlm, &num_transfers);
 551                 if (num_transfers < active_requests)
 552                         process_curl_messages();
 553         }
 554 #endif
 555
 556         while (slot != NULL && slot->in_use)
 557                 slot = slot->next;
 558
 559         if (slot == NULL) {
 560                 newslot = xmalloc(sizeof(*newslot));
 561                 newslot->curl = NULL;
 562                 newslot->in_use = 0;
 563                 newslot->next = NULL;
 564
 565                 slot = active_queue_head;
 566                 if (slot == NULL) {
 567                         active_queue_head = newslot;
 568                 } else {
 569                         while (slot->next != NULL)
 570                                 slot = slot->next;
 571                         slot->next = newslot;
 572                 }
 573                 slot = newslot;
 574         }
 575
 576         if (slot->curl == NULL) {
 577 #ifdef NO_CURL_EASY_DUPHANDLE
 578                 slot->curl = get_curl_handle();
 579 #else
 580                 slot->curl = curl_easy_duphandle(curl_default);
 581 #endif
 582                 curl_session_count++;
 583         }
 584
 585         active_requests++;
 586         slot->in_use = 1;
 587         slot->results = NULL;
 588         slot->finished = NULL;
 589         slot->callback_data = NULL;
 590         slot->callback_func = NULL;
 591         curl_easy_setopt(slot->curl, CURLOPT_COOKIEFILE, curl_cookie_file);
 592         if (curl_save_cookies)
 593                 curl_easy_setopt(slot->curl, CURLOPT_COOKIEJAR, curl_cookie_file);
 594         curl_easy_setopt(slot->curl, CURLOPT_HTTPHEADER, pragma_header);
 595         curl_easy_setopt(slot->curl, CURLOPT_ERRORBUFFER, curl_errorstr);
 596         curl_easy_setopt(slot->curl, CURLOPT_CUSTOMREQUEST, NULL);
 597         curl_easy_setopt(slot->curl, CURLOPT_READFUNCTION, NULL);
 598         curl_easy_setopt(slot->curl, CURLOPT_WRITEFUNCTION, NULL);
 599         curl_easy_setopt(slot->curl, CURLOPT_POSTFIELDS, NULL);
 600         curl_easy_setopt(slot->curl, CURLOPT_UPLOAD, 0);
 601         curl_easy_setopt(slot->curl, CURLOPT_HTTPGET, 1);
 602         curl_easy_setopt(slot->curl, CURLOPT_FAILONERROR, 1);
 603 #ifdef LIBCURL_CAN_HANDLE_AUTH_ANY
 604         curl_easy_setopt(slot->curl, CURLOPT_HTTPAUTH, http_auth_methods);
 605 #endif
 606         if (http_auth.password)
 607                 init_curl_http_auth(slot->curl);
 608
 609         return slot;
 610 }
 611
 612 int start_active_slot(struct active_request_slot *slot)
 613 {
 614 #ifdef USE_CURL_MULTI
 615         CURLMcode curlm_result = curl_multi_add_handle(curlm, slot->curl);
 616         int num_transfers;
 617
 618         if (curlm_result != CURLM_OK &&
 619             curlm_result != CURLM_CALL_MULTI_PERFORM) {
 620                 active_requests--;
 621                 slot->in_use = 0;
 622                 return 0;
 623         }
 624
 625         /*
 626          * We know there must be something to do, since we just added
 627          * something.
 628          */
 629         curl_multi_perform(curlm, &num_transfers);
 630 #endif
 631         return 1;
 632 }
 633
 634 #ifdef USE_CURL_MULTI
 635 struct fill_chain {
 636         void *data;
 637         int (*fill)(void *);
 638         struct fill_chain *next;
 639 };
 640
 641 static struct fill_chain *fill_cfg;
 642
 643 void add_fill_function(void *data, int (*fill)(void *))
 644 {
 645         struct fill_chain *new = xmalloc(sizeof(*new));
 646         struct fill_chain **linkp = &fill_cfg;
 647         new->data = data;
 648         new->fill = fill;
 649         new->next = NULL;
 650         while (*linkp)
 651                 linkp = &(*linkp)->next;
 652         *linkp = new;
 653 }
 654
 655 void fill_active_slots(void)
 656 {
 657         struct active_request_slot *slot = active_queue_head;
 658
 659         while (active_requests < max_requests) {
 660                 struct fill_chain *fill;
 661                 for (fill = fill_cfg; fill; fill = fill->next)
 662                         if (fill->fill(fill->data))
 663                                 break;
 664
 665                 if (!fill)
 666                         break;
 667         }
 668
 669         while (slot != NULL) {
 670                 if (!slot->in_use && slot->curl != NULL
 671                         && curl_session_count > min_curl_sessions) {
 672                         curl_easy_cleanup(slot->curl);
 673                         slot->curl = NULL;
 674                         curl_session_count--;
 675                 }
 676                 slot = slot->next;
 677         }
 678 }
 679
 680 void step_active_slots(void)
 681 {
 682         int num_transfers;
 683         CURLMcode curlm_result;
 684
 685         do {
 686                 curlm_result = curl_multi_perform(curlm, &num_transfers);
 687         } while (curlm_result == CURLM_CALL_MULTI_PERFORM);
 688         if (num_transfers < active_requests) {
 689                 process_curl_messages();
 690                 fill_active_slots();
 691         }
 692 }
 693 #endif
 694
 695 void run_active_slot(struct active_request_slot *slot)
 696 {
 697 #ifdef USE_CURL_MULTI
 698         fd_set readfds;
 699         fd_set writefds;
 700         fd_set excfds;
 701         int max_fd;
 702         struct timeval select_timeout;
 703         int finished = 0;
 704
 705         slot->finished = &finished;
 706         while (!finished) {
 707                 step_active_slots();
 708
 709                 if (slot->in_use) {
 710 #if LIBCURL_VERSION_NUM >= 0x070f04
 711                         long curl_timeout;
 712                         curl_multi_timeout(curlm, &curl_timeout);
 713                         if (curl_timeout == 0) {
 714                                 continue;
 715                         } else if (curl_timeout == -1) {
 716                                 select_timeout.tv_sec  = 0;
 717                                 select_timeout.tv_usec = 50000;
 718                         } else {
 719                                 select_timeout.tv_sec  =  curl_timeout / 1000;
 720                                 select_timeout.tv_usec = (curl_timeout % 1000) * 1000;
 721                         }
 722 #else
 723                         select_timeout.tv_sec  = 0;
 724                         select_timeout.tv_usec = 50000;
 725 #endif
 726
 727                         max_fd = -1;
 728                         FD_ZERO(&readfds);
 729                         FD_ZERO(&writefds);
 730                         FD_ZERO(&excfds);
 731                         curl_multi_fdset(curlm, &readfds, &writefds, &excfds, &max_fd);
 732
 733                         /*
 734                          * It can happen that curl_multi_timeout returns a pathologically
 735                          * long timeout when curl_multi_fdset returns no file descriptors
 736                          * to read.  See commit message for more details.
 737                          */
 738                         if (max_fd < 0 &&
 739                             (select_timeout.tv_sec > 0 ||
 740                              select_timeout.tv_usec > 50000)) {
 741                                 select_timeout.tv_sec  = 0;
 742                                 select_timeout.tv_usec = 50000;
 743                         }
 744
 745                         select(max_fd+1, &readfds, &writefds, &excfds, &select_timeout);
 746                 }
 747         }
 748 #else
 749         while (slot->in_use) {
 750                 slot->curl_result = curl_easy_perform(slot->curl);
 751                 finish_active_slot(slot);
 752         }
 753 #endif
 754 }
 755
 756 static void closedown_active_slot(struct active_request_slot *slot)
 757 {
 758         active_requests--;
 759         slot->in_use = 0;
 760 }
 761
 762 static void release_active_slot(struct active_request_slot *slot)
 763 {
 764         closedown_active_slot(slot);
 765         if (slot->curl && curl_session_count > min_curl_sessions) {
 766 #ifdef USE_CURL_MULTI
 767                 curl_multi_remove_handle(curlm, slot->curl);
 768 #endif
 769                 curl_easy_cleanup(slot->curl);
 770                 slot->curl = NULL;
 771                 curl_session_count--;
 772         }
 773 #ifdef USE_CURL_MULTI
 774         fill_active_slots();
 775 #endif
 776 }
 777
 778 void finish_active_slot(struct active_request_slot *slot)
 779 {
 780         closedown_active_slot(slot);
 781         curl_easy_getinfo(slot->curl, CURLINFO_HTTP_CODE, &slot->http_code);
 782
 783         if (slot->finished != NULL)
 784                 (*slot->finished) = 1;
 785
 786         /* Store slot results so they can be read after the slot is reused */
 787         if (slot->results != NULL) {
 788                 slot->results->curl_result = slot->curl_result;
 789                 slot->results->http_code = slot->http_code;
 790 #if LIBCURL_VERSION_NUM >= 0x070a08
 791                 curl_easy_getinfo(slot->curl, CURLINFO_HTTPAUTH_AVAIL,
 792                                   &slot->results->auth_avail);
 793 #else
 794                 slot->results->auth_avail = 0;
 795 #endif
 796         }
 797
 798         /* Run callback if appropriate */
 799         if (slot->callback_func != NULL)
 800                 slot->callback_func(slot->callback_data);
 801 }
 802
 803 void finish_all_active_slots(void)
 804 {
 805         struct active_request_slot *slot = active_queue_head;
 806
 807         while (slot != NULL)
 808                 if (slot->in_use) {
 809                         run_active_slot(slot);
 810                         slot = active_queue_head;
 811                 } else {
 812                         slot = slot->next;
 813                 }
 814 }
 815
 816 /* Helpers for modifying and creating URLs */
 817 static inline int needs_quote(int ch)
 818 {
 819         if (((ch >= 'A') && (ch <= 'Z'))
 820                         || ((ch >= 'a') && (ch <= 'z'))
 821                         || ((ch >= '0') && (ch <= '9'))
 822                         || (ch == '/')
 823                         || (ch == '-')
 824                         || (ch == '.'))
 825                 return 0;
 826         return 1;
 827 }
 828
 829 static char *quote_ref_url(const char *base, const char *ref)
 830 {
 831         struct strbuf buf = STRBUF_INIT;
 832         const char *cp;
 833         int ch;
 834
 835         end_url_with_slash(&buf, base);
 836
 837         for (cp = ref; (ch = *cp) != 0; cp++)
 838                 if (needs_quote(ch))
 839                         strbuf_addf(&buf, "%%%02x", ch);
 840                 else
 841                         strbuf_addch(&buf, *cp);
 842
 843         return strbuf_detach(&buf, NULL);
 844 }
 845
 846 void append_remote_object_url(struct strbuf *buf, const char *url,
 847                               const char *hex,
 848                               int only_two_digit_prefix)
 849 {
 850         end_url_with_slash(buf, url);
 851
 852         strbuf_addf(buf, "objects/%.*s/", 2, hex);
 853         if (!only_two_digit_prefix)
 854                 strbuf_addf(buf, "%s", hex+2);
 855 }
 856
 857 char *get_remote_object_url(const char *url, const char *hex,
 858                             int only_two_digit_prefix)
 859 {
 860         struct strbuf buf = STRBUF_INIT;
 861         append_remote_object_url(&buf, url, hex, only_two_digit_prefix);
 862         return strbuf_detach(&buf, NULL);
 863 }
 864
 865 int handle_curl_result(struct slot_results *results)
 866 {
 867         /*
 868          * If we see a failing http code with CURLE_OK, we have turned off
 869          * FAILONERROR (to keep the server's custom error response), and should
 870          * translate the code into failure here.
 871          */
 872         if (results->curl_result == CURLE_OK &&
 873             results->http_code >= 400) {
 874                 results->curl_result = CURLE_HTTP_RETURNED_ERROR;
 875                 /*
 876                  * Normally curl will already have put the "reason phrase"
 877                  * from the server into curl_errorstr; unfortunately without
 878                  * FAILONERROR it is lost, so we can give only the numeric
 879                  * status code.
 880                  */
 881                 snprintf(curl_errorstr, sizeof(curl_errorstr),
 882                          "The requested URL returned error: %ld",
 883                          results->http_code);
 884         }
 885
 886         if (results->curl_result == CURLE_OK) {
 887                 credential_approve(&http_auth);
 888                 return HTTP_OK;
 889         } else if (missing_target(results))
 890                 return HTTP_MISSING_TARGET;
 891         else if (results->http_code == 401) {
 892                 if (http_auth.username && http_auth.password) {
 893                         credential_reject(&http_auth);
 894                         return HTTP_NOAUTH;
 895                 } else {
 896 #ifdef LIBCURL_CAN_HANDLE_AUTH_ANY
 897                         http_auth_methods &= ~CURLAUTH_GSSNEGOTIATE;
 898 #endif
 899                         return HTTP_REAUTH;
 900                 }
 901         } else {
 902 #if LIBCURL_VERSION_NUM >= 0x070c00
 903                 if (!curl_errorstr[0])
 904                         strlcpy(curl_errorstr,
 905                                 curl_easy_strerror(results->curl_result),
 906                                 sizeof(curl_errorstr));
 907 #endif
 908                 return HTTP_ERROR;
 909         }
 910 }
 911
 912 int run_one_slot(struct active_request_slot *slot,
 913                  struct slot_results *results)
 914 {
 915         slot->results = results;
 916         if (!start_active_slot(slot)) {
 917                 snprintf(curl_errorstr, sizeof(curl_errorstr),
 918                          "failed to start HTTP request");
 919                 return HTTP_START_FAILED;
 920         }
 921
 922         run_active_slot(slot);
 923         return handle_curl_result(results);
 924 }
 925
 926 static CURLcode curlinfo_strbuf(CURL *curl, CURLINFO info, struct strbuf *buf)
 927 {
 928         char *ptr;
 929         CURLcode ret;
 930
 931         strbuf_reset(buf);
 932         ret = curl_easy_getinfo(curl, info, &ptr);
 933         if (!ret && ptr)
 934                 strbuf_addstr(buf, ptr);
 935         return ret;
 936 }
 937
 938 /*
 939  * Check for and extract a content-type parameter. "raw"
 940  * should be positioned at the start of the potential
 941  * parameter, with any whitespace already removed.
 942  *
 943  * "name" is the name of the parameter. The value is appended
 944  * to "out".
 945  */
 946 static int extract_param(const char *raw, const char *name,
 947                          struct strbuf *out)
 948 {
 949         size_t len = strlen(name);
 950
 951         if (strncasecmp(raw, name, len))
 952                 return -1;
 953         raw += len;
 954
 955         if (*raw != '=')
 956                 return -1;
 957         raw++;
 958
 959         while (*raw && !isspace(*raw) && *raw != ';')
 960                 strbuf_addch(out, *raw++);
 961         return 0;
 962 }
 963
 964 /*
 965  * Extract a normalized version of the content type, with any
 966  * spaces suppressed, all letters lowercased, and no trailing ";"
 967  * or parameters.
 968  *
 969  * Note that we will silently remove even invalid whitespace. For
 970  * example, "text / plain" is specifically forbidden by RFC 2616,
 971  * but "text/plain" is the only reasonable output, and this keeps
 972  * our code simple.
 973  *
 974  * If the "charset" argument is not NULL, store the value of any
 975  * charset parameter there.
 976  *
 977  * Example:
 978  *   "TEXT/PLAIN; charset=utf-8" -> "text/plain", "utf-8"
 979  *   "text / plain" -> "text/plain"
 980  */
 981 static void extract_content_type(struct strbuf *raw, struct strbuf *type,
 982                                  struct strbuf *charset)
 983 {
 984         const char *p;
 985
 986         strbuf_reset(type);
 987         strbuf_grow(type, raw->len);
 988         for (p = raw->buf; *p; p++) {
 989                 if (isspace(*p))
 990                         continue;
 991                 if (*p == ';') {
 992                         p++;
 993                         break;
 994                 }
 995                 strbuf_addch(type, tolower(*p));
 996         }
 997
 998         if (!charset)
 999                 return;
1000
1001         strbuf_reset(charset);
1002         while (*p) {
1003                 while (isspace(*p) || *p == ';')
1004                         p++;
1005                 if (!extract_param(p, "charset", charset))
1006                         return;
1007                 while (*p && !isspace(*p))
1008                         p++;
1009         }
1010
1011         if (!charset->len && starts_with(type->buf, "text/"))
1012                 strbuf_addstr(charset, "ISO-8859-1");
1013 }
1014
1015
1016 /* http_request() targets */
1017 #define HTTP_REQUEST_STRBUF     0
1018 #define HTTP_REQUEST_FILE       1
1019
1020 static int http_request(const char *url,
1021                         void *result, int target,
1022                         const struct http_get_options *options)
1023 {
1024         struct active_request_slot *slot;
1025         struct slot_results results;
1026         struct curl_slist *headers = NULL;
1027         struct strbuf buf = STRBUF_INIT;
1028         int ret;
1029
1030         slot = get_active_slot();
1031         curl_easy_setopt(slot->curl, CURLOPT_HTTPGET, 1);
1032
1033         if (result == NULL) {
1034                 curl_easy_setopt(slot->curl, CURLOPT_NOBODY, 1);
1035         } else {
1036                 curl_easy_setopt(slot->curl, CURLOPT_NOBODY, 0);
1037                 curl_easy_setopt(slot->curl, CURLOPT_FILE, result);
1038
1039                 if (target == HTTP_REQUEST_FILE) {
1040                         long posn = ftell(result);
1041                         curl_easy_setopt(slot->curl, CURLOPT_WRITEFUNCTION,
1042                                          fwrite);
1043                         if (posn > 0) {
1044                                 strbuf_addf(&buf, "Range: bytes=%ld-", posn);
1045                                 headers = curl_slist_append(headers, buf.buf);
1046                                 strbuf_reset(&buf);
1047                         }
1048                 } else
1049                         curl_easy_setopt(slot->curl, CURLOPT_WRITEFUNCTION,
1050                                          fwrite_buffer);
1051         }
1052
1053         strbuf_addstr(&buf, "Pragma:");
1054         if (options && options->no_cache)
1055                 strbuf_addstr(&buf, " no-cache");
1056         if (options && options->keep_error)
1057                 curl_easy_setopt(slot->curl, CURLOPT_FAILONERROR, 0);
1058
1059         headers = curl_slist_append(headers, buf.buf);
1060
1061         curl_easy_setopt(slot->curl, CURLOPT_URL, url);
1062         curl_easy_setopt(slot->curl, CURLOPT_HTTPHEADER, headers);
1063         curl_easy_setopt(slot->curl, CURLOPT_ENCODING, "gzip");
1064
1065         ret = run_one_slot(slot, &results);
1066
1067         if (options && options->content_type) {
1068                 struct strbuf raw = STRBUF_INIT;
1069                 curlinfo_strbuf(slot->curl, CURLINFO_CONTENT_TYPE, &raw);
1070                 extract_content_type(&raw, options->content_type,
1071                                      options->charset);
1072                 strbuf_release(&raw);
1073         }
1074
1075         if (options && options->effective_url)
1076                 curlinfo_strbuf(slot->curl, CURLINFO_EFFECTIVE_URL,
1077                                 options->effective_url);
1078
1079         curl_slist_free_all(headers);
1080         strbuf_release(&buf);
1081
1082         return ret;
1083 }
1084
1085 /*
1086  * Update the "base" url to a more appropriate value, as deduced by
1087  * redirects seen when requesting a URL starting with "url".
1088  *
1089  * The "asked" parameter is a URL that we asked curl to access, and must begin
1090  * with "base".
1091  *
1092  * The "got" parameter is the URL that curl reported to us as where we ended
1093  * up.
1094  *
1095  * Returns 1 if we updated the base url, 0 otherwise.
1096  *
1097  * Our basic strategy is to compare "base" and "asked" to find the bits
1098  * specific to our request. We then strip those bits off of "got" to yield the
1099  * new base. So for example, if our base is "http://example.com/foo.git",
1100  * and we ask for "http://example.com/foo.git/info/refs", we might end up
1101  * with "https://other.example.com/foo.git/info/refs". We would want the
1102  * new URL to become "https://other.example.com/foo.git".
1103  *
1104  * Note that this assumes a sane redirect scheme. It's entirely possible
1105  * in the example above to end up at a URL that does not even end in
1106  * "info/refs".  In such a case we simply punt, as there is not much we can
1107  * do (and such a scheme is unlikely to represent a real git repository,
1108  * which means we are likely about to abort anyway).
1109  */
1110 static int update_url_from_redirect(struct strbuf *base,
1111                                     const char *asked,
1112                                     const struct strbuf *got)
1113 {
1114         const char *tail;
1115         size_t tail_len;
1116
1117         if (!strcmp(asked, got->buf))
1118                 return 0;
1119
1120         if (!skip_prefix(asked, base->buf, &tail))
1121                 die("BUG: update_url_from_redirect: %s is not a superset of %s",
1122                     asked, base->buf);
1123
1124         tail_len = strlen(tail);
1125
1126         if (got->len < tail_len ||
1127             strcmp(tail, got->buf + got->len - tail_len))
1128                 return 0; /* insane redirect scheme */
1129
1130         strbuf_reset(base);
1131         strbuf_add(base, got->buf, got->len - tail_len);
1132         return 1;
1133 }
1134
1135 static int http_request_reauth(const char *url,
1136                                void *result, int target,
1137                                struct http_get_options *options)
1138 {
1139         int ret = http_request(url, result, target, options);
1140
1141         if (options && options->effective_url && options->base_url) {
1142                 if (update_url_from_redirect(options->base_url,
1143                                              url, options->effective_url)) {
1144                         credential_from_url(&http_auth, options->base_url->buf);
1145                         url = options->effective_url->buf;
1146                 }
1147         }
1148
1149         if (ret != HTTP_REAUTH)
1150                 return ret;
1151
1152         /*
1153          * If we are using KEEP_ERROR, the previous request may have
1154          * put cruft into our output stream; we should clear it out before
1155          * making our next request. We only know how to do this for
1156          * the strbuf case, but that is enough to satisfy current callers.
1157          */
1158         if (options && options->keep_error) {
1159                 switch (target) {
1160                 case HTTP_REQUEST_STRBUF:
1161                         strbuf_reset(result);
1162                         break;
1163                 default:
1164                         die("BUG: HTTP_KEEP_ERROR is only supported with strbufs");
1165                 }
1166         }
1167
1168         credential_fill(&http_auth);
1169
1170         return http_request(url, result, target, options);
1171 }
1172
1173 int http_get_strbuf(const char *url,
1174                     struct strbuf *result,
1175                     struct http_get_options *options)
1176 {
1177         return http_request_reauth(url, result, HTTP_REQUEST_STRBUF, options);
1178 }
1179
1180 /*
1181  * Downloads a URL and stores the result in the given file.
1182  *
1183  * If a previous interrupted download is detected (i.e. a previous temporary
1184  * file is still around) the download is resumed.
1185  */
1186 static int http_get_file(const char *url, const char *filename,
1187                          struct http_get_options *options)
1188 {
1189         int ret;
1190         struct strbuf tmpfile = STRBUF_INIT;
1191         FILE *result;
1192
1193         strbuf_addf(&tmpfile, "%s.temp", filename);
1194         result = fopen(tmpfile.buf, "a");
1195         if (!result) {
1196                 error("Unable to open local file %s", tmpfile.buf);
1197                 ret = HTTP_ERROR;
1198                 goto cleanup;
1199         }
1200
1201         ret = http_request_reauth(url, result, HTTP_REQUEST_FILE, options);
1202         fclose(result);
1203
1204         if (ret == HTTP_OK && move_temp_to_file(tmpfile.buf, filename))
1205                 ret = HTTP_ERROR;
1206 cleanup:
1207         strbuf_release(&tmpfile);
1208         return ret;
1209 }
1210
1211 int http_fetch_ref(const char *base, struct ref *ref)
1212 {
1213         struct http_get_options options = {0};
1214         char *url;
1215         struct strbuf buffer = STRBUF_INIT;
1216         int ret = -1;
1217
1218         options.no_cache = 1;
1219
1220         url = quote_ref_url(base, ref->name);
1221         if (http_get_strbuf(url, &buffer, &options) == HTTP_OK) {
1222                 strbuf_rtrim(&buffer);
1223                 if (buffer.len == 40)
1224                         ret = get_sha1_hex(buffer.buf, ref->old_sha1);
1225                 else if (starts_with(buffer.buf, "ref: ")) {
1226                         ref->symref = xstrdup(buffer.buf + 5);
1227                         ret = 0;
1228                 }
1229         }
1230
1231         strbuf_release(&buffer);
1232         free(url);
1233         return ret;
1234 }
1235
1236 /* Helpers for fetching packs */
1237 static char *fetch_pack_index(unsigned char *sha1, const char *base_url)
1238 {
1239         char *url, *tmp;
1240         struct strbuf buf = STRBUF_INIT;
1241
1242         if (http_is_verbose)
1243                 fprintf(stderr, "Getting index for pack %s\n", sha1_to_hex(sha1));
1244
1245         end_url_with_slash(&buf, base_url);
1246         strbuf_addf(&buf, "objects/pack/pack-%s.idx", sha1_to_hex(sha1));
1247         url = strbuf_detach(&buf, NULL);
1248
1249         strbuf_addf(&buf, "%s.temp", sha1_pack_index_name(sha1));
1250         tmp = strbuf_detach(&buf, NULL);
1251
1252         if (http_get_file(url, tmp, NULL) != HTTP_OK) {
1253                 error("Unable to get pack index %s", url);
1254                 free(tmp);
1255                 tmp = NULL;
1256         }
1257
1258         free(url);
1259         return tmp;
1260 }
1261
1262 static int fetch_and_setup_pack_index(struct packed_git **packs_head,
1263         unsigned char *sha1, const char *base_url)
1264 {
1265         struct packed_git *new_pack;
1266         char *tmp_idx = NULL;
1267         int ret;
1268
1269         if (has_pack_index(sha1)) {
1270                 new_pack = parse_pack_index(sha1, sha1_pack_index_name(sha1));
1271                 if (!new_pack)
1272                         return -1; /* parse_pack_index() already issued error message */
1273                 goto add_pack;
1274         }
1275
1276         tmp_idx = fetch_pack_index(sha1, base_url);
1277         if (!tmp_idx)
1278                 return -1;
1279
1280         new_pack = parse_pack_index(sha1, tmp_idx);
1281         if (!new_pack) {
1282                 unlink(tmp_idx);
1283                 free(tmp_idx);
1284
1285                 return -1; /* parse_pack_index() already issued error message */
1286         }
1287
1288         ret = verify_pack_index(new_pack);
1289         if (!ret) {
1290                 close_pack_index(new_pack);
1291                 ret = move_temp_to_file(tmp_idx, sha1_pack_index_name(sha1));
1292         }
1293         free(tmp_idx);
1294         if (ret)
1295                 return -1;
1296
1297 add_pack:
1298         new_pack->next = *packs_head;
1299         *packs_head = new_pack;
1300         return 0;
1301 }
1302
1303 int http_get_info_packs(const char *base_url, struct packed_git **packs_head)
1304 {
1305         struct http_get_options options = {0};
1306         int ret = 0, i = 0;
1307         char *url, *data;
1308         struct strbuf buf = STRBUF_INIT;
1309         unsigned char sha1[20];
1310
1311         end_url_with_slash(&buf, base_url);
1312         strbuf_addstr(&buf, "objects/info/packs");
1313         url = strbuf_detach(&buf, NULL);
1314
1315         options.no_cache = 1;
1316         ret = http_get_strbuf(url, &buf, &options);
1317         if (ret != HTTP_OK)
1318                 goto cleanup;
1319
1320         data = buf.buf;
1321         while (i < buf.len) {
1322                 switch (data[i]) {
1323                 case 'P':
1324                         i++;
1325                         if (i + 52 <= buf.len &&
1326                             starts_with(data + i, " pack-") &&
1327                             starts_with(data + i + 46, ".pack\n")) {
1328                                 get_sha1_hex(data + i + 6, sha1);
1329                                 fetch_and_setup_pack_index(packs_head, sha1,
1330                                                       base_url);
1331                                 i += 51;
1332                                 break;
1333                         }
1334                 default:
1335                         while (i < buf.len && data[i] != '\n')
1336                                 i++;
1337                 }
1338                 i++;
1339         }
1340
1341 cleanup:
1342         free(url);
1343         return ret;
1344 }
1345
1346 void release_http_pack_request(struct http_pack_request *preq)
1347 {
1348         if (preq->packfile != NULL) {
1349                 fclose(preq->packfile);
1350                 preq->packfile = NULL;
1351         }
1352         if (preq->range_header != NULL) {
1353                 curl_slist_free_all(preq->range_header);
1354                 preq->range_header = NULL;
1355         }
1356         preq->slot = NULL;
1357         free(preq->url);
1358 }
1359
1360 int finish_http_pack_request(struct http_pack_request *preq)
1361 {
1362         struct packed_git **lst;
1363         struct packed_git *p = preq->target;
1364         char *tmp_idx;
1365         struct child_process ip = CHILD_PROCESS_INIT;
1366         const char *ip_argv[8];
1367
1368         close_pack_index(p);
1369
1370         fclose(preq->packfile);
1371         preq->packfile = NULL;
1372
1373         lst = preq->lst;
1374         while (*lst != p)
1375                 lst = &((*lst)->next);
1376         *lst = (*lst)->next;
1377
1378         tmp_idx = xstrdup(preq->tmpfile);
1379         strcpy(tmp_idx + strlen(tmp_idx) - strlen(".pack.temp"),
1380                ".idx.temp");
1381
1382         ip_argv[0] = "index-pack";
1383         ip_argv[1] = "-o";
1384         ip_argv[2] = tmp_idx;
1385         ip_argv[3] = preq->tmpfile;
1386         ip_argv[4] = NULL;
1387
1388         ip.argv = ip_argv;
1389         ip.git_cmd = 1;
1390         ip.no_stdin = 1;
1391         ip.no_stdout = 1;
1392
1393         if (run_command(&ip)) {
1394                 unlink(preq->tmpfile);
1395                 unlink(tmp_idx);
1396                 free(tmp_idx);
1397                 return -1;
1398         }
1399
1400         unlink(sha1_pack_index_name(p->sha1));
1401
1402         if (move_temp_to_file(preq->tmpfile, sha1_pack_name(p->sha1))
1403          || move_temp_to_file(tmp_idx, sha1_pack_index_name(p->sha1))) {
1404                 free(tmp_idx);
1405                 return -1;
1406         }
1407
1408         install_packed_git(p);
1409         free(tmp_idx);
1410         return 0;
1411 }
1412
1413 struct http_pack_request *new_http_pack_request(
1414         struct packed_git *target, const char *base_url)
1415 {
1416         long prev_posn = 0;
1417         char range[RANGE_HEADER_SIZE];
1418         struct strbuf buf = STRBUF_INIT;
1419         struct http_pack_request *preq;
1420
1421         preq = xcalloc(1, sizeof(*preq));
1422         preq->target = target;
1423
1424         end_url_with_slash(&buf, base_url);
1425         strbuf_addf(&buf, "objects/pack/pack-%s.pack",
1426                 sha1_to_hex(target->sha1));
1427         preq->url = strbuf_detach(&buf, NULL);
1428
1429         snprintf(preq->tmpfile, sizeof(preq->tmpfile), "%s.temp",
1430                 sha1_pack_name(target->sha1));
1431         preq->packfile = fopen(preq->tmpfile, "a");
1432         if (!preq->packfile) {
1433                 error("Unable to open local file %s for pack",
1434                       preq->tmpfile);
1435                 goto abort;
1436         }
1437
1438         preq->slot = get_active_slot();
1439         curl_easy_setopt(preq->slot->curl, CURLOPT_FILE, preq->packfile);
1440         curl_easy_setopt(preq->slot->curl, CURLOPT_WRITEFUNCTION, fwrite);
1441         curl_easy_setopt(preq->slot->curl, CURLOPT_URL, preq->url);
1442         curl_easy_setopt(preq->slot->curl, CURLOPT_HTTPHEADER,
1443                 no_pragma_header);
1444
1445         /*
1446          * If there is data present from a previous transfer attempt,
1447          * resume where it left off
1448          */
1449         prev_posn = ftell(preq->packfile);
1450         if (prev_posn>0) {
1451                 if (http_is_verbose)
1452                         fprintf(stderr,
1453                                 "Resuming fetch of pack %s at byte %ld\n",
1454                                 sha1_to_hex(target->sha1), prev_posn);
1455                 sprintf(range, "Range: bytes=%ld-", prev_posn);
1456                 preq->range_header = curl_slist_append(NULL, range);
1457                 curl_easy_setopt(preq->slot->curl, CURLOPT_HTTPHEADER,
1458                         preq->range_header);
1459         }
1460
1461         return preq;
1462
1463 abort:
1464         free(preq->url);
1465         free(preq);
1466         return NULL;
1467 }
1468
1469 /* Helpers for fetching objects (loose) */
1470 static size_t fwrite_sha1_file(char *ptr, size_t eltsize, size_t nmemb,
1471                                void *data)
1472 {
1473         unsigned char expn[4096];
1474         size_t size = eltsize * nmemb;
1475         int posn = 0;
1476         struct http_object_request *freq =
1477                 (struct http_object_request *)data;
1478         do {
1479                 ssize_t retval = xwrite(freq->localfile,
1480                                         (char *) ptr + posn, size - posn);
1481                 if (retval < 0)
1482                         return posn;
1483                 posn += retval;
1484         } while (posn < size);
1485
1486         freq->stream.avail_in = size;
1487         freq->stream.next_in = (void *)ptr;
1488         do {
1489                 freq->stream.next_out = expn;
1490                 freq->stream.avail_out = sizeof(expn);
1491                 freq->zret = git_inflate(&freq->stream, Z_SYNC_FLUSH);
1492                 git_SHA1_Update(&freq->c, expn,
1493                                 sizeof(expn) - freq->stream.avail_out);
1494         } while (freq->stream.avail_in && freq->zret == Z_OK);
1495         return size;
1496 }
1497
1498 struct http_object_request *new_http_object_request(const char *base_url,
1499         unsigned char *sha1)
1500 {
1501         char *hex = sha1_to_hex(sha1);
1502         const char *filename;
1503         char prevfile[PATH_MAX];
1504         int prevlocal;
1505         char prev_buf[PREV_BUF_SIZE];
1506         ssize_t prev_read = 0;
1507         long prev_posn = 0;
1508         char range[RANGE_HEADER_SIZE];
1509         struct curl_slist *range_header = NULL;
1510         struct http_object_request *freq;
1511
1512         freq = xcalloc(1, sizeof(*freq));
1513         hashcpy(freq->sha1, sha1);
1514         freq->localfile = -1;
1515
1516         filename = sha1_file_name(sha1);
1517         snprintf(freq->tmpfile, sizeof(freq->tmpfile),
1518                  "%s.temp", filename);
1519
1520         snprintf(prevfile, sizeof(prevfile), "%s.prev", filename);
1521         unlink_or_warn(prevfile);
1522         rename(freq->tmpfile, prevfile);
1523         unlink_or_warn(freq->tmpfile);
1524
1525         if (freq->localfile != -1)
1526                 error("fd leakage in start: %d", freq->localfile);
1527         freq->localfile = open(freq->tmpfile,
1528                                O_WRONLY | O_CREAT | O_EXCL, 0666);
1529         /*
1530          * This could have failed due to the "lazy directory creation";
1531          * try to mkdir the last path component.
1532          */
1533         if (freq->localfile < 0 && errno == ENOENT) {
1534                 char *dir = strrchr(freq->tmpfile, '/');
1535                 if (dir) {
1536                         *dir = 0;
1537                         mkdir(freq->tmpfile, 0777);
1538                         *dir = '/';
1539                 }
1540                 freq->localfile = open(freq->tmpfile,
1541                                        O_WRONLY | O_CREAT | O_EXCL, 0666);
1542         }
1543
1544         if (freq->localfile < 0) {
1545                 error("Couldn't create temporary file %s: %s",
1546                       freq->tmpfile, strerror(errno));
1547                 goto abort;
1548         }
1549
1550         git_inflate_init(&freq->stream);
1551
1552         git_SHA1_Init(&freq->c);
1553
1554         freq->url = get_remote_object_url(base_url, hex, 0);
1555
1556         /*
1557          * If a previous temp file is present, process what was already
1558          * fetched.
1559          */
1560         prevlocal = open(prevfile, O_RDONLY);
1561         if (prevlocal != -1) {
1562                 do {
1563                         prev_read = xread(prevlocal, prev_buf, PREV_BUF_SIZE);
1564                         if (prev_read>0) {
1565                                 if (fwrite_sha1_file(prev_buf,
1566                                                      1,
1567                                                      prev_read,
1568                                                      freq) == prev_read) {
1569                                         prev_posn += prev_read;
1570                                 } else {
1571                                         prev_read = -1;
1572                                 }
1573                         }
1574                 } while (prev_read > 0);
1575                 close(prevlocal);
1576         }
1577         unlink_or_warn(prevfile);
1578
1579         /*
1580          * Reset inflate/SHA1 if there was an error reading the previous temp
1581          * file; also rewind to the beginning of the local file.
1582          */
1583         if (prev_read == -1) {
1584                 memset(&freq->stream, 0, sizeof(freq->stream));
1585                 git_inflate_init(&freq->stream);
1586                 git_SHA1_Init(&freq->c);
1587                 if (prev_posn>0) {
1588                         prev_posn = 0;
1589                         lseek(freq->localfile, 0, SEEK_SET);
1590                         if (ftruncate(freq->localfile, 0) < 0) {
1591                                 error("Couldn't truncate temporary file %s: %s",
1592                                           freq->tmpfile, strerror(errno));
1593                                 goto abort;
1594                         }
1595                 }
1596         }
1597
1598         freq->slot = get_active_slot();
1599
1600         curl_easy_setopt(freq->slot->curl, CURLOPT_FILE, freq);
1601         curl_easy_setopt(freq->slot->curl, CURLOPT_WRITEFUNCTION, fwrite_sha1_file);
1602         curl_easy_setopt(freq->slot->curl, CURLOPT_ERRORBUFFER, freq->errorstr);
1603         curl_easy_setopt(freq->slot->curl, CURLOPT_URL, freq->url);
1604         curl_easy_setopt(freq->slot->curl, CURLOPT_HTTPHEADER, no_pragma_header);
1605
1606         /*
1607          * If we have successfully processed data from a previous fetch
1608          * attempt, only fetch the data we don't already have.
1609          */
1610         if (prev_posn>0) {
1611                 if (http_is_verbose)
1612                         fprintf(stderr,
1613                                 "Resuming fetch of object %s at byte %ld\n",
1614                                 hex, prev_posn);
1615                 sprintf(range, "Range: bytes=%ld-", prev_posn);
1616                 range_header = curl_slist_append(range_header, range);
1617                 curl_easy_setopt(freq->slot->curl,
1618                                  CURLOPT_HTTPHEADER, range_header);
1619         }
1620
1621         return freq;
1622
1623 abort:
1624         free(freq->url);
1625         free(freq);
1626         return NULL;
1627 }
1628
1629 void process_http_object_request(struct http_object_request *freq)
1630 {
1631         if (freq->slot == NULL)
1632                 return;
1633         freq->curl_result = freq->slot->curl_result;
1634         freq->http_code = freq->slot->http_code;
1635         freq->slot = NULL;
1636 }
1637
1638 int finish_http_object_request(struct http_object_request *freq)
1639 {
1640         struct stat st;
1641
1642         close(freq->localfile);
1643         freq->localfile = -1;
1644
1645         process_http_object_request(freq);
1646
1647         if (freq->http_code == 416) {
1648                 warning("requested range invalid; we may already have all the data.");
1649         } else if (freq->curl_result != CURLE_OK) {
1650                 if (stat(freq->tmpfile, &st) == 0)
1651                         if (st.st_size == 0)
1652                                 unlink_or_warn(freq->tmpfile);
1653                 return -1;
1654         }
1655
1656         git_inflate_end(&freq->stream);
1657         git_SHA1_Final(freq->real_sha1, &freq->c);
1658         if (freq->zret != Z_STREAM_END) {
1659                 unlink_or_warn(freq->tmpfile);
1660                 return -1;
1661         }
1662         if (hashcmp(freq->sha1, freq->real_sha1)) {
1663                 unlink_or_warn(freq->tmpfile);
1664                 return -1;
1665         }
1666         freq->rename =
1667                 move_temp_to_file(freq->tmpfile, sha1_file_name(freq->sha1));
1668
1669         return freq->rename;
1670 }
1671
1672 void abort_http_object_request(struct http_object_request *freq)
1673 {
1674         unlink_or_warn(freq->tmpfile);
1675
1676         release_http_object_request(freq);
1677 }
1678
1679 void release_http_object_request(struct http_object_request *freq)
1680 {
1681         if (freq->localfile != -1) {
1682                 close(freq->localfile);
1683                 freq->localfile = -1;
1684         }
1685         if (freq->url != NULL) {
1686                 free(freq->url);
1687                 freq->url = NULL;
1688         }
1689         if (freq->slot != NULL) {
1690                 freq->slot->callback_func = NULL;
1691                 freq->slot->callback_data = NULL;
1692                 release_active_slot(freq->slot);
1693                 freq->slot = NULL;
1694         }
1695 }