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