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