http.c

   1 #include "http.h"
   2 #include "pack.h"
   3
   4 int data_received;
   5 int active_requests;
   6 int http_is_verbose;
   7
   8 #ifdef USE_CURL_MULTI
   9 static int max_requests = -1;
  10 static CURLM *curlm;
  11 #endif
  12 #ifndef NO_CURL_EASY_DUPHANDLE
  13 static CURL *curl_default;
  14 #endif
  15
  16 #define PREV_BUF_SIZE 4096
  17 #define RANGE_HEADER_SIZE 30
  18
  19 char curl_errorstr[CURL_ERROR_SIZE];
  20
  21 static int curl_ssl_verify = -1;
  22 static const char *ssl_cert;
  23 #if LIBCURL_VERSION_NUM >= 0x070903
  24 static const char *ssl_key;
  25 #endif
  26 #if LIBCURL_VERSION_NUM >= 0x070908
  27 static const char *ssl_capath;
  28 #endif
  29 static const char *ssl_cainfo;
  30 static long curl_low_speed_limit = -1;
  31 static long curl_low_speed_time = -1;
  32 static int curl_ftp_no_epsv;
  33 static const char *curl_http_proxy;
  34 static char *user_name, *user_pass;
  35
  36 #if LIBCURL_VERSION_NUM >= 0x071700
  37 /* Use CURLOPT_KEYPASSWD as is */
  38 #elif LIBCURL_VERSION_NUM >= 0x070903
  39 #define CURLOPT_KEYPASSWD CURLOPT_SSLKEYPASSWD
  40 #else
  41 #define CURLOPT_KEYPASSWD CURLOPT_SSLCERTPASSWD
  42 #endif
  43
  44 static char *ssl_cert_password;
  45 static int ssl_cert_password_required;
  46
  47 static struct curl_slist *pragma_header;
  48 static struct curl_slist *no_pragma_header;
  49
  50 static struct active_request_slot *active_queue_head;
  51
  52 size_t fread_buffer(void *ptr, size_t eltsize, size_t nmemb, void *buffer_)
  53 {
  54         size_t size = eltsize * nmemb;
  55         struct buffer *buffer = buffer_;
  56
  57         if (size > buffer->buf.len - buffer->posn)
  58                 size = buffer->buf.len - buffer->posn;
  59         memcpy(ptr, buffer->buf.buf + buffer->posn, size);
  60         buffer->posn += size;
  61
  62         return size;
  63 }
  64
  65 #ifndef NO_CURL_IOCTL
  66 curlioerr ioctl_buffer(CURL *handle, int cmd, void *clientp)
  67 {
  68         struct buffer *buffer = clientp;
  69
  70         switch (cmd) {
  71         case CURLIOCMD_NOP:
  72                 return CURLIOE_OK;
  73
  74         case CURLIOCMD_RESTARTREAD:
  75                 buffer->posn = 0;
  76                 return CURLIOE_OK;
  77
  78         default:
  79                 return CURLIOE_UNKNOWNCMD;
  80         }
  81 }
  82 #endif
  83
  84 size_t fwrite_buffer(const void *ptr, size_t eltsize, size_t nmemb, void *buffer_)
  85 {
  86         size_t size = eltsize * nmemb;
  87         struct strbuf *buffer = buffer_;
  88
  89         strbuf_add(buffer, ptr, size);
  90         data_received++;
  91         return size;
  92 }
  93
  94 size_t fwrite_null(const void *ptr, size_t eltsize, size_t nmemb, void *strbuf)
  95 {
  96         data_received++;
  97         return eltsize * nmemb;
  98 }
  99
 100 static void finish_active_slot(struct active_request_slot *slot);
 101
 102 #ifdef USE_CURL_MULTI
 103 static void process_curl_messages(void)
 104 {
 105         int num_messages;
 106         struct active_request_slot *slot;
 107         CURLMsg *curl_message = curl_multi_info_read(curlm, &num_messages);
 108
 109         while (curl_message != NULL) {
 110                 if (curl_message->msg == CURLMSG_DONE) {
 111                         int curl_result = curl_message->data.result;
 112                         slot = active_queue_head;
 113                         while (slot != NULL &&
 114                                slot->curl != curl_message->easy_handle)
 115                                 slot = slot->next;
 116                         if (slot != NULL) {
 117                                 curl_multi_remove_handle(curlm, slot->curl);
 118                                 slot->curl_result = curl_result;
 119                                 finish_active_slot(slot);
 120                         } else {
 121                                 fprintf(stderr, "Received DONE message for unknown request!\n");
 122                         }
 123                 } else {
 124                         fprintf(stderr, "Unknown CURL message received: %d\n",
 125                                 (int)curl_message->msg);
 126                 }
 127                 curl_message = curl_multi_info_read(curlm, &num_messages);
 128         }
 129 }
 130 #endif
 131
 132 static int http_options(const char *var, const char *value, void *cb)
 133 {
 134         if (!strcmp("http.sslverify", var)) {
 135                 curl_ssl_verify = git_config_bool(var, value);
 136                 return 0;
 137         }
 138         if (!strcmp("http.sslcert", var))
 139                 return git_config_string(&ssl_cert, var, value);
 140 #if LIBCURL_VERSION_NUM >= 0x070903
 141         if (!strcmp("http.sslkey", var))
 142                 return git_config_string(&ssl_key, var, value);
 143 #endif
 144 #if LIBCURL_VERSION_NUM >= 0x070908
 145         if (!strcmp("http.sslcapath", var))
 146                 return git_config_string(&ssl_capath, var, value);
 147 #endif
 148         if (!strcmp("http.sslcainfo", var))
 149                 return git_config_string(&ssl_cainfo, var, value);
 150         if (!strcmp("http.sslcertpasswordprotected", var)) {
 151                 if (git_config_bool(var, value))
 152                         ssl_cert_password_required = 1;
 153                 return 0;
 154         }
 155 #ifdef USE_CURL_MULTI
 156         if (!strcmp("http.maxrequests", var)) {
 157                 max_requests = git_config_int(var, value);
 158                 return 0;
 159         }
 160 #endif
 161         if (!strcmp("http.lowspeedlimit", var)) {
 162                 curl_low_speed_limit = (long)git_config_int(var, value);
 163                 return 0;
 164         }
 165         if (!strcmp("http.lowspeedtime", var)) {
 166                 curl_low_speed_time = (long)git_config_int(var, value);
 167                 return 0;
 168         }
 169
 170         if (!strcmp("http.noepsv", var)) {
 171                 curl_ftp_no_epsv = git_config_bool(var, value);
 172                 return 0;
 173         }
 174         if (!strcmp("http.proxy", var))
 175                 return git_config_string(&curl_http_proxy, var, value);
 176
 177         /* Fall back on the default ones */
 178         return git_default_config(var, value, cb);
 179 }
 180
 181 static void init_curl_http_auth(CURL *result)
 182 {
 183         if (user_name) {
 184                 struct strbuf up = STRBUF_INIT;
 185                 if (!user_pass)
 186                         user_pass = xstrdup(getpass("Password: "));
 187                 strbuf_addf(&up, "%s:%s", user_name, user_pass);
 188                 curl_easy_setopt(result, CURLOPT_USERPWD,
 189                                  strbuf_detach(&up, NULL));
 190         }
 191 }
 192
 193 static int has_cert_password(void)
 194 {
 195         if (ssl_cert_password != NULL)
 196                 return 1;
 197         if (ssl_cert == NULL || ssl_cert_password_required != 1)
 198                 return 0;
 199         /* Only prompt the user once. */
 200         ssl_cert_password_required = -1;
 201         ssl_cert_password = getpass("Certificate Password: ");
 202         if (ssl_cert_password != NULL) {
 203                 ssl_cert_password = xstrdup(ssl_cert_password);
 204                 return 1;
 205         } else
 206                 return 0;
 207 }
 208
 209 static CURL *get_curl_handle(void)
 210 {
 211         CURL *result = curl_easy_init();
 212
 213         if (!curl_ssl_verify) {
 214                 curl_easy_setopt(result, CURLOPT_SSL_VERIFYPEER, 0);
 215                 curl_easy_setopt(result, CURLOPT_SSL_VERIFYHOST, 0);
 216         } else {
 217                 /* Verify authenticity of the peer's certificate */
 218                 curl_easy_setopt(result, CURLOPT_SSL_VERIFYPEER, 1);
 219                 /* The name in the cert must match whom we tried to connect */
 220                 curl_easy_setopt(result, CURLOPT_SSL_VERIFYHOST, 2);
 221         }
 222
 223 #if LIBCURL_VERSION_NUM >= 0x070907
 224         curl_easy_setopt(result, CURLOPT_NETRC, CURL_NETRC_OPTIONAL);
 225 #endif
 226
 227         init_curl_http_auth(result);
 228
 229         if (ssl_cert != NULL)
 230                 curl_easy_setopt(result, CURLOPT_SSLCERT, ssl_cert);
 231         if (has_cert_password())
 232                 curl_easy_setopt(result, CURLOPT_KEYPASSWD, ssl_cert_password);
 233 #if LIBCURL_VERSION_NUM >= 0x070903
 234         if (ssl_key != NULL)
 235                 curl_easy_setopt(result, CURLOPT_SSLKEY, ssl_key);
 236 #endif
 237 #if LIBCURL_VERSION_NUM >= 0x070908
 238         if (ssl_capath != NULL)
 239                 curl_easy_setopt(result, CURLOPT_CAPATH, ssl_capath);
 240 #endif
 241         if (ssl_cainfo != NULL)
 242                 curl_easy_setopt(result, CURLOPT_CAINFO, ssl_cainfo);
 243         curl_easy_setopt(result, CURLOPT_FAILONERROR, 1);
 244
 245         if (curl_low_speed_limit > 0 && curl_low_speed_time > 0) {
 246                 curl_easy_setopt(result, CURLOPT_LOW_SPEED_LIMIT,
 247                                  curl_low_speed_limit);
 248                 curl_easy_setopt(result, CURLOPT_LOW_SPEED_TIME,
 249                                  curl_low_speed_time);
 250         }
 251
 252         curl_easy_setopt(result, CURLOPT_FOLLOWLOCATION, 1);
 253
 254         if (getenv("GIT_CURL_VERBOSE"))
 255                 curl_easy_setopt(result, CURLOPT_VERBOSE, 1);
 256
 257         curl_easy_setopt(result, CURLOPT_USERAGENT, GIT_USER_AGENT);
 258
 259         if (curl_ftp_no_epsv)
 260                 curl_easy_setopt(result, CURLOPT_FTP_USE_EPSV, 0);
 261
 262         if (curl_http_proxy)
 263                 curl_easy_setopt(result, CURLOPT_PROXY, curl_http_proxy);
 264
 265         return result;
 266 }
 267
 268 static void http_auth_init(const char *url)
 269 {
 270         char *at, *colon, *cp, *slash;
 271         int len;
 272
 273         cp = strstr(url, "://");
 274         if (!cp)
 275                 return;
 276
 277         /*
 278          * Ok, the URL looks like "proto://something".  Which one?
 279          * "proto://<user>:<pass>@<host>/...",
 280          * "proto://<user>@<host>/...", or just
 281          * "proto://<host>/..."?
 282          */
 283         cp += 3;
 284         at = strchr(cp, '@');
 285         colon = strchr(cp, ':');
 286         slash = strchrnul(cp, '/');
 287         if (!at || slash <= at)
 288                 return; /* No credentials */
 289         if (!colon || at <= colon) {
 290                 /* Only username */
 291                 len = at - cp;
 292                 user_name = xmalloc(len + 1);
 293                 memcpy(user_name, cp, len);
 294                 user_name[len] = '\0';
 295                 user_pass = NULL;
 296         } else {
 297                 len = colon - cp;
 298                 user_name = xmalloc(len + 1);
 299                 memcpy(user_name, cp, len);
 300                 user_name[len] = '\0';
 301                 len = at - (colon + 1);
 302                 user_pass = xmalloc(len + 1);
 303                 memcpy(user_pass, colon + 1, len);
 304                 user_pass[len] = '\0';
 305         }
 306 }
 307
 308 static void set_from_env(const char **var, const char *envname)
 309 {
 310         const char *val = getenv(envname);
 311         if (val)
 312                 *var = val;
 313 }
 314
 315 void http_init(struct remote *remote)
 316 {
 317         char *low_speed_limit;
 318         char *low_speed_time;
 319
 320         http_is_verbose = 0;
 321
 322         git_config(http_options, NULL);
 323
 324         curl_global_init(CURL_GLOBAL_ALL);
 325
 326         if (remote && remote->http_proxy)
 327                 curl_http_proxy = xstrdup(remote->http_proxy);
 328
 329         pragma_header = curl_slist_append(pragma_header, "Pragma: no-cache");
 330         no_pragma_header = curl_slist_append(no_pragma_header, "Pragma:");
 331
 332 #ifdef USE_CURL_MULTI
 333         {
 334                 char *http_max_requests = getenv("GIT_HTTP_MAX_REQUESTS");
 335                 if (http_max_requests != NULL)
 336                         max_requests = atoi(http_max_requests);
 337         }
 338
 339         curlm = curl_multi_init();
 340         if (curlm == NULL) {
 341                 fprintf(stderr, "Error creating curl multi handle.\n");
 342                 exit(1);
 343         }
 344 #endif
 345
 346         if (getenv("GIT_SSL_NO_VERIFY"))
 347                 curl_ssl_verify = 0;
 348
 349         set_from_env(&ssl_cert, "GIT_SSL_CERT");
 350 #if LIBCURL_VERSION_NUM >= 0x070903
 351         set_from_env(&ssl_key, "GIT_SSL_KEY");
 352 #endif
 353 #if LIBCURL_VERSION_NUM >= 0x070908
 354         set_from_env(&ssl_capath, "GIT_SSL_CAPATH");
 355 #endif
 356         set_from_env(&ssl_cainfo, "GIT_SSL_CAINFO");
 357
 358         low_speed_limit = getenv("GIT_HTTP_LOW_SPEED_LIMIT");
 359         if (low_speed_limit != NULL)
 360                 curl_low_speed_limit = strtol(low_speed_limit, NULL, 10);
 361         low_speed_time = getenv("GIT_HTTP_LOW_SPEED_TIME");
 362         if (low_speed_time != NULL)
 363                 curl_low_speed_time = strtol(low_speed_time, NULL, 10);
 364
 365         if (curl_ssl_verify == -1)
 366                 curl_ssl_verify = 1;
 367
 368 #ifdef USE_CURL_MULTI
 369         if (max_requests < 1)
 370                 max_requests = DEFAULT_MAX_REQUESTS;
 371 #endif
 372
 373         if (getenv("GIT_CURL_FTP_NO_EPSV"))
 374                 curl_ftp_no_epsv = 1;
 375
 376         if (remote && remote->url && remote->url[0]) {
 377                 http_auth_init(remote->url[0]);
 378                 if (!ssl_cert_password_required &&
 379                     getenv("GIT_SSL_CERT_PASSWORD_PROTECTED") &&
 380                     !prefixcmp(remote->url[0], "https://"))
 381                         ssl_cert_password_required = 1;
 382         }
 383
 384 #ifndef NO_CURL_EASY_DUPHANDLE
 385         curl_default = get_curl_handle();
 386 #endif
 387 }
 388
 389 void http_cleanup(void)
 390 {
 391         struct active_request_slot *slot = active_queue_head;
 392
 393         while (slot != NULL) {
 394                 struct active_request_slot *next = slot->next;
 395                 if (slot->curl != NULL) {
 396 #ifdef USE_CURL_MULTI
 397                         curl_multi_remove_handle(curlm, slot->curl);
 398 #endif
 399                         curl_easy_cleanup(slot->curl);
 400                 }
 401                 free(slot);
 402                 slot = next;
 403         }
 404         active_queue_head = NULL;
 405
 406 #ifndef NO_CURL_EASY_DUPHANDLE
 407         curl_easy_cleanup(curl_default);
 408 #endif
 409
 410 #ifdef USE_CURL_MULTI
 411         curl_multi_cleanup(curlm);
 412 #endif
 413         curl_global_cleanup();
 414
 415         curl_slist_free_all(pragma_header);
 416         pragma_header = NULL;
 417
 418         curl_slist_free_all(no_pragma_header);
 419         no_pragma_header = NULL;
 420
 421         if (curl_http_proxy) {
 422                 free((void *)curl_http_proxy);
 423                 curl_http_proxy = NULL;
 424         }
 425
 426         if (ssl_cert_password != NULL) {
 427                 memset(ssl_cert_password, 0, strlen(ssl_cert_password));
 428                 free(ssl_cert_password);
 429                 ssl_cert_password = NULL;
 430         }
 431         ssl_cert_password_required = 0;
 432 }
 433
 434 struct active_request_slot *get_active_slot(void)
 435 {
 436         struct active_request_slot *slot = active_queue_head;
 437         struct active_request_slot *newslot;
 438
 439 #ifdef USE_CURL_MULTI
 440         int num_transfers;
 441
 442         /* Wait for a slot to open up if the queue is full */
 443         while (active_requests >= max_requests) {
 444                 curl_multi_perform(curlm, &num_transfers);
 445                 if (num_transfers < active_requests)
 446                         process_curl_messages();
 447         }
 448 #endif
 449
 450         while (slot != NULL && slot->in_use)
 451                 slot = slot->next;
 452
 453         if (slot == NULL) {
 454                 newslot = xmalloc(sizeof(*newslot));
 455                 newslot->curl = NULL;
 456                 newslot->in_use = 0;
 457                 newslot->next = NULL;
 458
 459                 slot = active_queue_head;
 460                 if (slot == NULL) {
 461                         active_queue_head = newslot;
 462                 } else {
 463                         while (slot->next != NULL)
 464                                 slot = slot->next;
 465                         slot->next = newslot;
 466                 }
 467                 slot = newslot;
 468         }
 469
 470         if (slot->curl == NULL) {
 471 #ifdef NO_CURL_EASY_DUPHANDLE
 472                 slot->curl = get_curl_handle();
 473 #else
 474                 slot->curl = curl_easy_duphandle(curl_default);
 475 #endif
 476         }
 477
 478         active_requests++;
 479         slot->in_use = 1;
 480         slot->local = NULL;
 481         slot->results = NULL;
 482         slot->finished = NULL;
 483         slot->callback_data = NULL;
 484         slot->callback_func = NULL;
 485         curl_easy_setopt(slot->curl, CURLOPT_HTTPHEADER, pragma_header);
 486         curl_easy_setopt(slot->curl, CURLOPT_ERRORBUFFER, curl_errorstr);
 487         curl_easy_setopt(slot->curl, CURLOPT_CUSTOMREQUEST, NULL);
 488         curl_easy_setopt(slot->curl, CURLOPT_READFUNCTION, NULL);
 489         curl_easy_setopt(slot->curl, CURLOPT_WRITEFUNCTION, NULL);
 490         curl_easy_setopt(slot->curl, CURLOPT_UPLOAD, 0);
 491         curl_easy_setopt(slot->curl, CURLOPT_HTTPGET, 1);
 492
 493         return slot;
 494 }
 495
 496 int start_active_slot(struct active_request_slot *slot)
 497 {
 498 #ifdef USE_CURL_MULTI
 499         CURLMcode curlm_result = curl_multi_add_handle(curlm, slot->curl);
 500         int num_transfers;
 501
 502         if (curlm_result != CURLM_OK &&
 503             curlm_result != CURLM_CALL_MULTI_PERFORM) {
 504                 active_requests--;
 505                 slot->in_use = 0;
 506                 return 0;
 507         }
 508
 509         /*
 510          * We know there must be something to do, since we just added
 511          * something.
 512          */
 513         curl_multi_perform(curlm, &num_transfers);
 514 #endif
 515         return 1;
 516 }
 517
 518 #ifdef USE_CURL_MULTI
 519 struct fill_chain {
 520         void *data;
 521         int (*fill)(void *);
 522         struct fill_chain *next;
 523 };
 524
 525 static struct fill_chain *fill_cfg;
 526
 527 void add_fill_function(void *data, int (*fill)(void *))
 528 {
 529         struct fill_chain *new = xmalloc(sizeof(*new));
 530         struct fill_chain **linkp = &fill_cfg;
 531         new->data = data;
 532         new->fill = fill;
 533         new->next = NULL;
 534         while (*linkp)
 535                 linkp = &(*linkp)->next;
 536         *linkp = new;
 537 }
 538
 539 void fill_active_slots(void)
 540 {
 541         struct active_request_slot *slot = active_queue_head;
 542
 543         while (active_requests < max_requests) {
 544                 struct fill_chain *fill;
 545                 for (fill = fill_cfg; fill; fill = fill->next)
 546                         if (fill->fill(fill->data))
 547                                 break;
 548
 549                 if (!fill)
 550                         break;
 551         }
 552
 553         while (slot != NULL) {
 554                 if (!slot->in_use && slot->curl != NULL) {
 555                         curl_easy_cleanup(slot->curl);
 556                         slot->curl = NULL;
 557                 }
 558                 slot = slot->next;
 559         }
 560 }
 561
 562 void step_active_slots(void)
 563 {
 564         int num_transfers;
 565         CURLMcode curlm_result;
 566
 567         do {
 568                 curlm_result = curl_multi_perform(curlm, &num_transfers);
 569         } while (curlm_result == CURLM_CALL_MULTI_PERFORM);
 570         if (num_transfers < active_requests) {
 571                 process_curl_messages();
 572                 fill_active_slots();
 573         }
 574 }
 575 #endif
 576
 577 void run_active_slot(struct active_request_slot *slot)
 578 {
 579 #ifdef USE_CURL_MULTI
 580         long last_pos = 0;
 581         long current_pos;
 582         fd_set readfds;
 583         fd_set writefds;
 584         fd_set excfds;
 585         int max_fd;
 586         struct timeval select_timeout;
 587         int finished = 0;
 588
 589         slot->finished = &finished;
 590         while (!finished) {
 591                 data_received = 0;
 592                 step_active_slots();
 593
 594                 if (!data_received && slot->local != NULL) {
 595                         current_pos = ftell(slot->local);
 596                         if (current_pos > last_pos)
 597                                 data_received++;
 598                         last_pos = current_pos;
 599                 }
 600
 601                 if (slot->in_use && !data_received) {
 602                         max_fd = 0;
 603                         FD_ZERO(&readfds);
 604                         FD_ZERO(&writefds);
 605                         FD_ZERO(&excfds);
 606                         select_timeout.tv_sec = 0;
 607                         select_timeout.tv_usec = 50000;
 608                         select(max_fd, &readfds, &writefds,
 609                                &excfds, &select_timeout);
 610                 }
 611         }
 612 #else
 613         while (slot->in_use) {
 614                 slot->curl_result = curl_easy_perform(slot->curl);
 615                 finish_active_slot(slot);
 616         }
 617 #endif
 618 }
 619
 620 static void closedown_active_slot(struct active_request_slot *slot)
 621 {
 622         active_requests--;
 623         slot->in_use = 0;
 624 }
 625
 626 void release_active_slot(struct active_request_slot *slot)
 627 {
 628         closedown_active_slot(slot);
 629         if (slot->curl) {
 630 #ifdef USE_CURL_MULTI
 631                 curl_multi_remove_handle(curlm, slot->curl);
 632 #endif
 633                 curl_easy_cleanup(slot->curl);
 634                 slot->curl = NULL;
 635         }
 636 #ifdef USE_CURL_MULTI
 637         fill_active_slots();
 638 #endif
 639 }
 640
 641 static void finish_active_slot(struct active_request_slot *slot)
 642 {
 643         closedown_active_slot(slot);
 644         curl_easy_getinfo(slot->curl, CURLINFO_HTTP_CODE, &slot->http_code);
 645
 646         if (slot->finished != NULL)
 647                 (*slot->finished) = 1;
 648
 649         /* Store slot results so they can be read after the slot is reused */
 650         if (slot->results != NULL) {
 651                 slot->results->curl_result = slot->curl_result;
 652                 slot->results->http_code = slot->http_code;
 653         }
 654
 655         /* Run callback if appropriate */
 656         if (slot->callback_func != NULL)
 657                 slot->callback_func(slot->callback_data);
 658 }
 659
 660 void finish_all_active_slots(void)
 661 {
 662         struct active_request_slot *slot = active_queue_head;
 663
 664         while (slot != NULL)
 665                 if (slot->in_use) {
 666                         run_active_slot(slot);
 667                         slot = active_queue_head;
 668                 } else {
 669                         slot = slot->next;
 670                 }
 671 }
 672
 673 /* Helpers for modifying and creating URLs */
 674 static inline int needs_quote(int ch)
 675 {
 676         if (((ch >= 'A') && (ch <= 'Z'))
 677                         || ((ch >= 'a') && (ch <= 'z'))
 678                         || ((ch >= '0') && (ch <= '9'))
 679                         || (ch == '/')
 680                         || (ch == '-')
 681                         || (ch == '.'))
 682                 return 0;
 683         return 1;
 684 }
 685
 686 static inline int hex(int v)
 687 {
 688         if (v < 10)
 689                 return '0' + v;
 690         else
 691                 return 'A' + v - 10;
 692 }
 693
 694 static void end_url_with_slash(struct strbuf *buf, const char *url)
 695 {
 696         strbuf_addstr(buf, url);
 697         if (buf->len && buf->buf[buf->len - 1] != '/')
 698                 strbuf_addstr(buf, "/");
 699 }
 700
 701 static char *quote_ref_url(const char *base, const char *ref)
 702 {
 703         struct strbuf buf = STRBUF_INIT;
 704         const char *cp;
 705         int ch;
 706
 707         end_url_with_slash(&buf, base);
 708
 709         for (cp = ref; (ch = *cp) != 0; cp++)
 710                 if (needs_quote(ch))
 711                         strbuf_addf(&buf, "%%%02x", ch);
 712                 else
 713                         strbuf_addch(&buf, *cp);
 714
 715         return strbuf_detach(&buf, NULL);
 716 }
 717
 718 void append_remote_object_url(struct strbuf *buf, const char *url,
 719                               const char *hex,
 720                               int only_two_digit_prefix)
 721 {
 722         strbuf_addf(buf, "%s/objects/%.*s/", url, 2, hex);
 723         if (!only_two_digit_prefix)
 724                 strbuf_addf(buf, "%s", hex+2);
 725 }
 726
 727 char *get_remote_object_url(const char *url, const char *hex,
 728                             int only_two_digit_prefix)
 729 {
 730         struct strbuf buf = STRBUF_INIT;
 731         append_remote_object_url(&buf, url, hex, only_two_digit_prefix);
 732         return strbuf_detach(&buf, NULL);
 733 }
 734
 735 /* http_request() targets */
 736 #define HTTP_REQUEST_STRBUF     0
 737 #define HTTP_REQUEST_FILE       1
 738
 739 static int http_request(const char *url, void *result, int target, int options)
 740 {
 741         struct active_request_slot *slot;
 742         struct slot_results results;
 743         struct curl_slist *headers = NULL;
 744         struct strbuf buf = STRBUF_INIT;
 745         int ret;
 746
 747         slot = get_active_slot();
 748         slot->results = &results;
 749         curl_easy_setopt(slot->curl, CURLOPT_HTTPGET, 1);
 750
 751         if (result == NULL) {
 752                 curl_easy_setopt(slot->curl, CURLOPT_NOBODY, 1);
 753         } else {
 754                 curl_easy_setopt(slot->curl, CURLOPT_NOBODY, 0);
 755                 curl_easy_setopt(slot->curl, CURLOPT_FILE, result);
 756
 757                 if (target == HTTP_REQUEST_FILE) {
 758                         long posn = ftell(result);
 759                         curl_easy_setopt(slot->curl, CURLOPT_WRITEFUNCTION,
 760                                          fwrite);
 761                         if (posn > 0) {
 762                                 strbuf_addf(&buf, "Range: bytes=%ld-", posn);
 763                                 headers = curl_slist_append(headers, buf.buf);
 764                                 strbuf_reset(&buf);
 765                         }
 766                         slot->local = result;
 767                 } else
 768                         curl_easy_setopt(slot->curl, CURLOPT_WRITEFUNCTION,
 769                                          fwrite_buffer);
 770         }
 771
 772         strbuf_addstr(&buf, "Pragma:");
 773         if (options & HTTP_NO_CACHE)
 774                 strbuf_addstr(&buf, " no-cache");
 775
 776         headers = curl_slist_append(headers, buf.buf);
 777
 778         curl_easy_setopt(slot->curl, CURLOPT_URL, url);
 779         curl_easy_setopt(slot->curl, CURLOPT_HTTPHEADER, headers);
 780
 781         if (start_active_slot(slot)) {
 782                 run_active_slot(slot);
 783                 if (results.curl_result == CURLE_OK)
 784                         ret = HTTP_OK;
 785                 else if (missing_target(&results))
 786                         ret = HTTP_MISSING_TARGET;
 787                 else
 788                         ret = HTTP_ERROR;
 789         } else {
 790                 error("Unable to start HTTP request for %s", url);
 791                 ret = HTTP_START_FAILED;
 792         }
 793
 794         slot->local = NULL;
 795         curl_slist_free_all(headers);
 796         strbuf_release(&buf);
 797
 798         return ret;
 799 }
 800
 801 int http_get_strbuf(const char *url, struct strbuf *result, int options)
 802 {
 803         return http_request(url, result, HTTP_REQUEST_STRBUF, options);
 804 }
 805
 806 int http_get_file(const char *url, const char *filename, int options)
 807 {
 808         int ret;
 809         struct strbuf tmpfile = STRBUF_INIT;
 810         FILE *result;
 811
 812         strbuf_addf(&tmpfile, "%s.temp", filename);
 813         result = fopen(tmpfile.buf, "a");
 814         if (! result) {
 815                 error("Unable to open local file %s", tmpfile.buf);
 816                 ret = HTTP_ERROR;
 817                 goto cleanup;
 818         }
 819
 820         ret = http_request(url, result, HTTP_REQUEST_FILE, options);
 821         fclose(result);
 822
 823         if ((ret == HTTP_OK) && move_temp_to_file(tmpfile.buf, filename))
 824                 ret = HTTP_ERROR;
 825 cleanup:
 826         strbuf_release(&tmpfile);
 827         return ret;
 828 }
 829
 830 int http_error(const char *url, int ret)
 831 {
 832         /* http_request has already handled HTTP_START_FAILED. */
 833         if (ret != HTTP_START_FAILED)
 834                 error("%s while accessing %s\n", curl_errorstr, url);
 835
 836         return ret;
 837 }
 838
 839 int http_fetch_ref(const char *base, struct ref *ref)
 840 {
 841         char *url;
 842         struct strbuf buffer = STRBUF_INIT;
 843         int ret = -1;
 844
 845         url = quote_ref_url(base, ref->name);
 846         if (http_get_strbuf(url, &buffer, HTTP_NO_CACHE) == HTTP_OK) {
 847                 strbuf_rtrim(&buffer);
 848                 if (buffer.len == 40)
 849                         ret = get_sha1_hex(buffer.buf, ref->old_sha1);
 850                 else if (!prefixcmp(buffer.buf, "ref: ")) {
 851                         ref->symref = xstrdup(buffer.buf + 5);
 852                         ret = 0;
 853                 }
 854         }
 855
 856         strbuf_release(&buffer);
 857         free(url);
 858         return ret;
 859 }
 860
 861 /* Helpers for fetching packs */
 862 static int fetch_pack_index(unsigned char *sha1, const char *base_url)
 863 {
 864         int ret = 0;
 865         char *hex = xstrdup(sha1_to_hex(sha1));
 866         char *filename;
 867         char *url;
 868         struct strbuf buf = STRBUF_INIT;
 869
 870         /* Don't use the index if the pack isn't there */
 871         end_url_with_slash(&buf, base_url);
 872         strbuf_addf(&buf, "objects/pack/pack-%s.pack", hex);
 873         url = strbuf_detach(&buf, 0);
 874
 875         if (http_get_strbuf(url, NULL, 0)) {
 876                 ret = error("Unable to verify pack %s is available",
 877                             hex);
 878                 goto cleanup;
 879         }
 880
 881         if (has_pack_index(sha1)) {
 882                 ret = 0;
 883                 goto cleanup;
 884         }
 885
 886         if (http_is_verbose)
 887                 fprintf(stderr, "Getting index for pack %s\n", hex);
 888
 889         end_url_with_slash(&buf, base_url);
 890         strbuf_addf(&buf, "objects/pack/pack-%s.idx", hex);
 891         url = strbuf_detach(&buf, NULL);
 892
 893         filename = sha1_pack_index_name(sha1);
 894         if (http_get_file(url, filename, 0) != HTTP_OK)
 895                 ret = error("Unable to get pack index %s\n", url);
 896
 897 cleanup:
 898         free(hex);
 899         free(url);
 900         return ret;
 901 }
 902
 903 static int fetch_and_setup_pack_index(struct packed_git **packs_head,
 904         unsigned char *sha1, const char *base_url)
 905 {
 906         struct packed_git *new_pack;
 907
 908         if (fetch_pack_index(sha1, base_url))
 909                 return -1;
 910
 911         new_pack = parse_pack_index(sha1);
 912         if (!new_pack)
 913                 return -1; /* parse_pack_index() already issued error message */
 914         new_pack->next = *packs_head;
 915         *packs_head = new_pack;
 916         return 0;
 917 }
 918
 919 int http_get_info_packs(const char *base_url, struct packed_git **packs_head)
 920 {
 921         int ret = 0, i = 0;
 922         char *url, *data;
 923         struct strbuf buf = STRBUF_INIT;
 924         unsigned char sha1[20];
 925
 926         end_url_with_slash(&buf, base_url);
 927         strbuf_addstr(&buf, "objects/info/packs");
 928         url = strbuf_detach(&buf, NULL);
 929
 930         ret = http_get_strbuf(url, &buf, HTTP_NO_CACHE);
 931         if (ret != HTTP_OK)
 932                 goto cleanup;
 933
 934         data = buf.buf;
 935         while (i < buf.len) {
 936                 switch (data[i]) {
 937                 case 'P':
 938                         i++;
 939                         if (i + 52 <= buf.len &&
 940                             !prefixcmp(data + i, " pack-") &&
 941                             !prefixcmp(data + i + 46, ".pack\n")) {
 942                                 get_sha1_hex(data + i + 6, sha1);
 943                                 fetch_and_setup_pack_index(packs_head, sha1,
 944                                                       base_url);
 945                                 i += 51;
 946                                 break;
 947                         }
 948                 default:
 949                         while (i < buf.len && data[i] != '\n')
 950                                 i++;
 951                 }
 952                 i++;
 953         }
 954
 955 cleanup:
 956         free(url);
 957         return ret;
 958 }
 959
 960 void release_http_pack_request(struct http_pack_request *preq)
 961 {
 962         if (preq->packfile != NULL) {
 963                 fclose(preq->packfile);
 964                 preq->packfile = NULL;
 965                 preq->slot->local = NULL;
 966         }
 967         if (preq->range_header != NULL) {
 968                 curl_slist_free_all(preq->range_header);
 969                 preq->range_header = NULL;
 970         }
 971         preq->slot = NULL;
 972         free(preq->url);
 973 }
 974
 975 int finish_http_pack_request(struct http_pack_request *preq)
 976 {
 977         int ret;
 978         struct packed_git **lst;
 979
 980         preq->target->pack_size = ftell(preq->packfile);
 981
 982         if (preq->packfile != NULL) {
 983                 fclose(preq->packfile);
 984                 preq->packfile = NULL;
 985                 preq->slot->local = NULL;
 986         }
 987
 988         ret = move_temp_to_file(preq->tmpfile, preq->filename);
 989         if (ret)
 990                 return ret;
 991
 992         lst = preq->lst;
 993         while (*lst != preq->target)
 994                 lst = &((*lst)->next);
 995         *lst = (*lst)->next;
 996
 997         if (verify_pack(preq->target))
 998                 return -1;
 999         install_packed_git(preq->target);
1000
1001         return 0;
1002 }
1003
1004 struct http_pack_request *new_http_pack_request(
1005         struct packed_git *target, const char *base_url)
1006 {
1007         char *url;
1008         char *filename;
1009         long prev_posn = 0;
1010         char range[RANGE_HEADER_SIZE];
1011         struct strbuf buf = STRBUF_INIT;
1012         struct http_pack_request *preq;
1013
1014         preq = xmalloc(sizeof(*preq));
1015         preq->target = target;
1016         preq->range_header = NULL;
1017
1018         end_url_with_slash(&buf, base_url);
1019         strbuf_addf(&buf, "objects/pack/pack-%s.pack",
1020                 sha1_to_hex(target->sha1));
1021         url = strbuf_detach(&buf, NULL);
1022         preq->url = xstrdup(url);
1023
1024         filename = sha1_pack_name(target->sha1);
1025         snprintf(preq->filename, sizeof(preq->filename), "%s", filename);
1026         snprintf(preq->tmpfile, sizeof(preq->tmpfile), "%s.temp", filename);
1027         preq->packfile = fopen(preq->tmpfile, "a");
1028         if (!preq->packfile) {
1029                 error("Unable to open local file %s for pack",
1030                       preq->tmpfile);
1031                 goto abort;
1032         }
1033
1034         preq->slot = get_active_slot();
1035         preq->slot->local = preq->packfile;
1036         curl_easy_setopt(preq->slot->curl, CURLOPT_FILE, preq->packfile);
1037         curl_easy_setopt(preq->slot->curl, CURLOPT_WRITEFUNCTION, fwrite);
1038         curl_easy_setopt(preq->slot->curl, CURLOPT_URL, url);
1039         curl_easy_setopt(preq->slot->curl, CURLOPT_HTTPHEADER,
1040                 no_pragma_header);
1041
1042         /*
1043          * If there is data present from a previous transfer attempt,
1044          * resume where it left off
1045          */
1046         prev_posn = ftell(preq->packfile);
1047         if (prev_posn>0) {
1048                 if (http_is_verbose)
1049                         fprintf(stderr,
1050                                 "Resuming fetch of pack %s at byte %ld\n",
1051                                 sha1_to_hex(target->sha1), prev_posn);
1052                 sprintf(range, "Range: bytes=%ld-", prev_posn);
1053                 preq->range_header = curl_slist_append(NULL, range);
1054                 curl_easy_setopt(preq->slot->curl, CURLOPT_HTTPHEADER,
1055                         preq->range_header);
1056         }
1057
1058         return preq;
1059
1060 abort:
1061         free(filename);
1062         return NULL;
1063 }
1064
1065 /* Helpers for fetching objects (loose) */
1066 static size_t fwrite_sha1_file(void *ptr, size_t eltsize, size_t nmemb,
1067                                void *data)
1068 {
1069         unsigned char expn[4096];
1070         size_t size = eltsize * nmemb;
1071         int posn = 0;
1072         struct http_object_request *freq =
1073                 (struct http_object_request *)data;
1074         do {
1075                 ssize_t retval = xwrite(freq->localfile,
1076                                         (char *) ptr + posn, size - posn);
1077                 if (retval < 0)
1078                         return posn;
1079                 posn += retval;
1080         } while (posn < size);
1081
1082         freq->stream.avail_in = size;
1083         freq->stream.next_in = ptr;
1084         do {
1085                 freq->stream.next_out = expn;
1086                 freq->stream.avail_out = sizeof(expn);
1087                 freq->zret = git_inflate(&freq->stream, Z_SYNC_FLUSH);
1088                 git_SHA1_Update(&freq->c, expn,
1089                                 sizeof(expn) - freq->stream.avail_out);
1090         } while (freq->stream.avail_in && freq->zret == Z_OK);
1091         data_received++;
1092         return size;
1093 }
1094
1095 struct http_object_request *new_http_object_request(const char *base_url,
1096         unsigned char *sha1)
1097 {
1098         char *hex = sha1_to_hex(sha1);
1099         char *filename;
1100         char prevfile[PATH_MAX];
1101         char *url;
1102         int prevlocal;
1103         unsigned char prev_buf[PREV_BUF_SIZE];
1104         ssize_t prev_read = 0;
1105         long prev_posn = 0;
1106         char range[RANGE_HEADER_SIZE];
1107         struct curl_slist *range_header = NULL;
1108         struct http_object_request *freq;
1109
1110         freq = xmalloc(sizeof(*freq));
1111         hashcpy(freq->sha1, sha1);
1112         freq->localfile = -1;
1113
1114         filename = sha1_file_name(sha1);
1115         snprintf(freq->filename, sizeof(freq->filename), "%s", filename);
1116         snprintf(freq->tmpfile, sizeof(freq->tmpfile),
1117                  "%s.temp", filename);
1118
1119         snprintf(prevfile, sizeof(prevfile), "%s.prev", filename);
1120         unlink_or_warn(prevfile);
1121         rename(freq->tmpfile, prevfile);
1122         unlink_or_warn(freq->tmpfile);
1123
1124         if (freq->localfile != -1)
1125                 error("fd leakage in start: %d", freq->localfile);
1126         freq->localfile = open(freq->tmpfile,
1127                                O_WRONLY | O_CREAT | O_EXCL, 0666);
1128         /*
1129          * This could have failed due to the "lazy directory creation";
1130          * try to mkdir the last path component.
1131          */
1132         if (freq->localfile < 0 && errno == ENOENT) {
1133                 char *dir = strrchr(freq->tmpfile, '/');
1134                 if (dir) {
1135                         *dir = 0;
1136                         mkdir(freq->tmpfile, 0777);
1137                         *dir = '/';
1138                 }
1139                 freq->localfile = open(freq->tmpfile,
1140                                        O_WRONLY | O_CREAT | O_EXCL, 0666);
1141         }
1142
1143         if (freq->localfile < 0) {
1144                 error("Couldn't create temporary file %s for %s: %s",
1145                       freq->tmpfile, freq->filename, strerror(errno));
1146                 goto abort;
1147         }
1148
1149         memset(&freq->stream, 0, sizeof(freq->stream));
1150
1151         git_inflate_init(&freq->stream);
1152
1153         git_SHA1_Init(&freq->c);
1154
1155         url = get_remote_object_url(base_url, hex, 0);
1156         freq->url = xstrdup(url);
1157
1158         /*
1159          * If a previous temp file is present, process what was already
1160          * fetched.
1161          */
1162         prevlocal = open(prevfile, O_RDONLY);
1163         if (prevlocal != -1) {
1164                 do {
1165                         prev_read = xread(prevlocal, prev_buf, PREV_BUF_SIZE);
1166                         if (prev_read>0) {
1167                                 if (fwrite_sha1_file(prev_buf,
1168                                                      1,
1169                                                      prev_read,
1170                                                      freq) == prev_read) {
1171                                         prev_posn += prev_read;
1172                                 } else {
1173                                         prev_read = -1;
1174                                 }
1175                         }
1176                 } while (prev_read > 0);
1177                 close(prevlocal);
1178         }
1179         unlink_or_warn(prevfile);
1180
1181         /*
1182          * Reset inflate/SHA1 if there was an error reading the previous temp
1183          * file; also rewind to the beginning of the local file.
1184          */
1185         if (prev_read == -1) {
1186                 memset(&freq->stream, 0, sizeof(freq->stream));
1187                 git_inflate_init(&freq->stream);
1188                 git_SHA1_Init(&freq->c);
1189                 if (prev_posn>0) {
1190                         prev_posn = 0;
1191                         lseek(freq->localfile, 0, SEEK_SET);
1192                         ftruncate(freq->localfile, 0);
1193                 }
1194         }
1195
1196         freq->slot = get_active_slot();
1197
1198         curl_easy_setopt(freq->slot->curl, CURLOPT_FILE, freq);
1199         curl_easy_setopt(freq->slot->curl, CURLOPT_WRITEFUNCTION, fwrite_sha1_file);
1200         curl_easy_setopt(freq->slot->curl, CURLOPT_ERRORBUFFER, freq->errorstr);
1201         curl_easy_setopt(freq->slot->curl, CURLOPT_URL, url);
1202         curl_easy_setopt(freq->slot->curl, CURLOPT_HTTPHEADER, no_pragma_header);
1203
1204         /*
1205          * If we have successfully processed data from a previous fetch
1206          * attempt, only fetch the data we don't already have.
1207          */
1208         if (prev_posn>0) {
1209                 if (http_is_verbose)
1210                         fprintf(stderr,
1211                                 "Resuming fetch of object %s at byte %ld\n",
1212                                 hex, prev_posn);
1213                 sprintf(range, "Range: bytes=%ld-", prev_posn);
1214                 range_header = curl_slist_append(range_header, range);
1215                 curl_easy_setopt(freq->slot->curl,
1216                                  CURLOPT_HTTPHEADER, range_header);
1217         }
1218
1219         return freq;
1220
1221         free(url);
1222 abort:
1223         free(filename);
1224         free(freq);
1225         return NULL;
1226 }
1227
1228 void process_http_object_request(struct http_object_request *freq)
1229 {
1230         if (freq->slot == NULL)
1231                 return;
1232         freq->curl_result = freq->slot->curl_result;
1233         freq->http_code = freq->slot->http_code;
1234         freq->slot = NULL;
1235 }
1236
1237 int finish_http_object_request(struct http_object_request *freq)
1238 {
1239         struct stat st;
1240
1241         close(freq->localfile);
1242         freq->localfile = -1;
1243
1244         process_http_object_request(freq);
1245
1246         if (freq->http_code == 416) {
1247                 fprintf(stderr, "Warning: requested range invalid; we may already have all the data.\n");
1248         } else if (freq->curl_result != CURLE_OK) {
1249                 if (stat(freq->tmpfile, &st) == 0)
1250                         if (st.st_size == 0)
1251                                 unlink_or_warn(freq->tmpfile);
1252                 return -1;
1253         }
1254
1255         git_inflate_end(&freq->stream);
1256         git_SHA1_Final(freq->real_sha1, &freq->c);
1257         if (freq->zret != Z_STREAM_END) {
1258                 unlink_or_warn(freq->tmpfile);
1259                 return -1;
1260         }
1261         if (hashcmp(freq->sha1, freq->real_sha1)) {
1262                 unlink_or_warn(freq->tmpfile);
1263                 return -1;
1264         }
1265         freq->rename =
1266                 move_temp_to_file(freq->tmpfile, freq->filename);
1267
1268         return freq->rename;
1269 }
1270
1271 void abort_http_object_request(struct http_object_request *freq)
1272 {
1273         unlink_or_warn(freq->tmpfile);
1274
1275         release_http_object_request(freq);
1276 }
1277
1278 void release_http_object_request(struct http_object_request *freq)
1279 {
1280         if (freq->localfile != -1) {
1281                 close(freq->localfile);
1282                 freq->localfile = -1;
1283         }
1284         if (freq->url != NULL) {
1285                 free(freq->url);
1286                 freq->url = NULL;
1287         }
1288         freq->slot = NULL;
1289 }