http.c

   1 #include "http.h"
   2 #include "pack.h"
   3 #include "sideband.h"
   4
   5 int data_received;
   6 int active_requests;
   7 int http_is_verbose;
   8 size_t http_post_buffer = 16 * LARGE_PACKET_MAX;
   9
  10 #ifdef USE_CURL_MULTI
  11 static int max_requests = -1;
  12 static CURLM *curlm;
  13 #endif
  14 #ifndef NO_CURL_EASY_DUPHANDLE
  15 static CURL *curl_default;
  16 #endif
  17
  18 #define PREV_BUF_SIZE 4096
  19 #define RANGE_HEADER_SIZE 30
  20
  21 char curl_errorstr[CURL_ERROR_SIZE];
  22
  23 static int curl_ssl_verify = -1;
  24 static const char *ssl_cert;
  25 #if LIBCURL_VERSION_NUM >= 0x070903
  26 static const char *ssl_key;
  27 #endif
  28 #if LIBCURL_VERSION_NUM >= 0x070908
  29 static const char *ssl_capath;
  30 #endif
  31 static const char *ssl_cainfo;
  32 static long curl_low_speed_limit = -1;
  33 static long curl_low_speed_time = -1;
  34 static int curl_ftp_no_epsv;
  35 static const char *curl_http_proxy;
  36 static char *user_name, *user_pass;
  37
  38 #if LIBCURL_VERSION_NUM >= 0x071700
  39 /* Use CURLOPT_KEYPASSWD as is */
  40 #elif LIBCURL_VERSION_NUM >= 0x070903
  41 #define CURLOPT_KEYPASSWD CURLOPT_SSLKEYPASSWD
  42 #else
  43 #define CURLOPT_KEYPASSWD CURLOPT_SSLCERTPASSWD
  44 #endif
  45
  46 static char *ssl_cert_password;
  47 static int ssl_cert_password_required;
  48
  49 static struct curl_slist *pragma_header;
  50 static struct curl_slist *no_pragma_header;
  51
  52 static struct active_request_slot *active_queue_head;
  53
  54 size_t fread_buffer(void *ptr, size_t eltsize, size_t nmemb, void *buffer_)
  55 {
  56         size_t size = eltsize * nmemb;
  57         struct buffer *buffer = buffer_;
  58
  59         if (size > buffer->buf.len - buffer->posn)
  60                 size = buffer->buf.len - buffer->posn;
  61         memcpy(ptr, buffer->buf.buf + buffer->posn, size);
  62         buffer->posn += size;
  63
  64         return size;
  65 }
  66
  67 #ifndef NO_CURL_IOCTL
  68 curlioerr ioctl_buffer(CURL *handle, int cmd, void *clientp)
  69 {
  70         struct buffer *buffer = clientp;
  71
  72         switch (cmd) {
  73         case CURLIOCMD_NOP:
  74                 return CURLIOE_OK;
  75
  76         case CURLIOCMD_RESTARTREAD:
  77                 buffer->posn = 0;
  78                 return CURLIOE_OK;
  79
  80         default:
  81                 return CURLIOE_UNKNOWNCMD;
  82         }
  83 }
  84 #endif
  85
  86 size_t fwrite_buffer(const void *ptr, size_t eltsize, size_t nmemb, void *buffer_)
  87 {
  88         size_t size = eltsize * nmemb;
  89         struct strbuf *buffer = buffer_;
  90
  91         strbuf_add(buffer, ptr, size);
  92         data_received++;
  93         return size;
  94 }
  95
  96 size_t fwrite_null(const void *ptr, size_t eltsize, size_t nmemb, void *strbuf)
  97 {
  98         data_received++;
  99         return eltsize * nmemb;
 100 }
 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         if (!strcmp("http.postbuffer", var)) {
 178                 http_post_buffer = git_config_int(var, value);
 179                 if (http_post_buffer < LARGE_PACKET_MAX)
 180                         http_post_buffer = LARGE_PACKET_MAX;
 181                 return 0;
 182         }
 183
 184         /* Fall back on the default ones */
 185         return git_default_config(var, value, cb);
 186 }
 187
 188 static void init_curl_http_auth(CURL *result)
 189 {
 190         if (user_name) {
 191                 struct strbuf up = STRBUF_INIT;
 192                 if (!user_pass)
 193                         user_pass = xstrdup(getpass("Password: "));
 194                 strbuf_addf(&up, "%s:%s", user_name, user_pass);
 195                 curl_easy_setopt(result, CURLOPT_USERPWD,
 196                                  strbuf_detach(&up, NULL));
 197         }
 198 }
 199
 200 static int has_cert_password(void)
 201 {
 202         if (ssl_cert_password != NULL)
 203                 return 1;
 204         if (ssl_cert == NULL || ssl_cert_password_required != 1)
 205                 return 0;
 206         /* Only prompt the user once. */
 207         ssl_cert_password_required = -1;
 208         ssl_cert_password = getpass("Certificate Password: ");
 209         if (ssl_cert_password != NULL) {
 210                 ssl_cert_password = xstrdup(ssl_cert_password);
 211                 return 1;
 212         } else
 213                 return 0;
 214 }
 215
 216 static CURL *get_curl_handle(void)
 217 {
 218         CURL *result = curl_easy_init();
 219
 220         if (!curl_ssl_verify) {
 221                 curl_easy_setopt(result, CURLOPT_SSL_VERIFYPEER, 0);
 222                 curl_easy_setopt(result, CURLOPT_SSL_VERIFYHOST, 0);
 223         } else {
 224                 /* Verify authenticity of the peer's certificate */
 225                 curl_easy_setopt(result, CURLOPT_SSL_VERIFYPEER, 1);
 226                 /* The name in the cert must match whom we tried to connect */
 227                 curl_easy_setopt(result, CURLOPT_SSL_VERIFYHOST, 2);
 228         }
 229
 230 #if LIBCURL_VERSION_NUM >= 0x070907
 231         curl_easy_setopt(result, CURLOPT_NETRC, CURL_NETRC_OPTIONAL);
 232 #endif
 233
 234         init_curl_http_auth(result);
 235
 236         if (ssl_cert != NULL)
 237                 curl_easy_setopt(result, CURLOPT_SSLCERT, ssl_cert);
 238         if (has_cert_password())
 239                 curl_easy_setopt(result, CURLOPT_KEYPASSWD, ssl_cert_password);
 240 #if LIBCURL_VERSION_NUM >= 0x070903
 241         if (ssl_key != NULL)
 242                 curl_easy_setopt(result, CURLOPT_SSLKEY, ssl_key);
 243 #endif
 244 #if LIBCURL_VERSION_NUM >= 0x070908
 245         if (ssl_capath != NULL)
 246                 curl_easy_setopt(result, CURLOPT_CAPATH, ssl_capath);
 247 #endif
 248         if (ssl_cainfo != NULL)
 249                 curl_easy_setopt(result, CURLOPT_CAINFO, ssl_cainfo);
 250         curl_easy_setopt(result, CURLOPT_FAILONERROR, 1);
 251
 252         if (curl_low_speed_limit > 0 && curl_low_speed_time > 0) {
 253                 curl_easy_setopt(result, CURLOPT_LOW_SPEED_LIMIT,
 254                                  curl_low_speed_limit);
 255                 curl_easy_setopt(result, CURLOPT_LOW_SPEED_TIME,
 256                                  curl_low_speed_time);
 257         }
 258
 259         curl_easy_setopt(result, CURLOPT_FOLLOWLOCATION, 1);
 260
 261         if (getenv("GIT_CURL_VERBOSE"))
 262                 curl_easy_setopt(result, CURLOPT_VERBOSE, 1);
 263
 264         curl_easy_setopt(result, CURLOPT_USERAGENT, GIT_USER_AGENT);
 265
 266         if (curl_ftp_no_epsv)
 267                 curl_easy_setopt(result, CURLOPT_FTP_USE_EPSV, 0);
 268
 269         if (curl_http_proxy)
 270                 curl_easy_setopt(result, CURLOPT_PROXY, curl_http_proxy);
 271
 272         return result;
 273 }
 274
 275 static void http_auth_init(const char *url)
 276 {
 277         char *at, *colon, *cp, *slash;
 278         int len;
 279
 280         cp = strstr(url, "://");
 281         if (!cp)
 282                 return;
 283
 284         /*
 285          * Ok, the URL looks like "proto://something".  Which one?
 286          * "proto://<user>:<pass>@<host>/...",
 287          * "proto://<user>@<host>/...", or just
 288          * "proto://<host>/..."?
 289          */
 290         cp += 3;
 291         at = strchr(cp, '@');
 292         colon = strchr(cp, ':');
 293         slash = strchrnul(cp, '/');
 294         if (!at || slash <= at)
 295                 return; /* No credentials */
 296         if (!colon || at <= colon) {
 297                 /* Only username */
 298                 len = at - cp;
 299                 user_name = xmalloc(len + 1);
 300                 memcpy(user_name, cp, len);
 301                 user_name[len] = '\0';
 302                 user_pass = NULL;
 303         } else {
 304                 len = colon - cp;
 305                 user_name = xmalloc(len + 1);
 306                 memcpy(user_name, cp, len);
 307                 user_name[len] = '\0';
 308                 len = at - (colon + 1);
 309                 user_pass = xmalloc(len + 1);
 310                 memcpy(user_pass, colon + 1, len);
 311                 user_pass[len] = '\0';
 312         }
 313 }
 314
 315 static void set_from_env(const char **var, const char *envname)
 316 {
 317         const char *val = getenv(envname);
 318         if (val)
 319                 *var = val;
 320 }
 321
 322 void http_init(struct remote *remote)
 323 {
 324         char *low_speed_limit;
 325         char *low_speed_time;
 326
 327         http_is_verbose = 0;
 328
 329         git_config(http_options, NULL);
 330
 331         curl_global_init(CURL_GLOBAL_ALL);
 332
 333         if (remote && remote->http_proxy)
 334                 curl_http_proxy = xstrdup(remote->http_proxy);
 335
 336         pragma_header = curl_slist_append(pragma_header, "Pragma: no-cache");
 337         no_pragma_header = curl_slist_append(no_pragma_header, "Pragma:");
 338
 339 #ifdef USE_CURL_MULTI
 340         {
 341                 char *http_max_requests = getenv("GIT_HTTP_MAX_REQUESTS");
 342                 if (http_max_requests != NULL)
 343                         max_requests = atoi(http_max_requests);
 344         }
 345
 346         curlm = curl_multi_init();
 347         if (curlm == NULL) {
 348                 fprintf(stderr, "Error creating curl multi handle.\n");
 349                 exit(1);
 350         }
 351 #endif
 352
 353         if (getenv("GIT_SSL_NO_VERIFY"))
 354                 curl_ssl_verify = 0;
 355
 356         set_from_env(&ssl_cert, "GIT_SSL_CERT");
 357 #if LIBCURL_VERSION_NUM >= 0x070903
 358         set_from_env(&ssl_key, "GIT_SSL_KEY");
 359 #endif
 360 #if LIBCURL_VERSION_NUM >= 0x070908
 361         set_from_env(&ssl_capath, "GIT_SSL_CAPATH");
 362 #endif
 363         set_from_env(&ssl_cainfo, "GIT_SSL_CAINFO");
 364
 365         low_speed_limit = getenv("GIT_HTTP_LOW_SPEED_LIMIT");
 366         if (low_speed_limit != NULL)
 367                 curl_low_speed_limit = strtol(low_speed_limit, NULL, 10);
 368         low_speed_time = getenv("GIT_HTTP_LOW_SPEED_TIME");
 369         if (low_speed_time != NULL)
 370                 curl_low_speed_time = strtol(low_speed_time, NULL, 10);
 371
 372         if (curl_ssl_verify == -1)
 373                 curl_ssl_verify = 1;
 374
 375 #ifdef USE_CURL_MULTI
 376         if (max_requests < 1)
 377                 max_requests = DEFAULT_MAX_REQUESTS;
 378 #endif
 379
 380         if (getenv("GIT_CURL_FTP_NO_EPSV"))
 381                 curl_ftp_no_epsv = 1;
 382
 383         if (remote && remote->url && remote->url[0]) {
 384                 http_auth_init(remote->url[0]);
 385                 if (!ssl_cert_password_required &&
 386                     getenv("GIT_SSL_CERT_PASSWORD_PROTECTED") &&
 387                     !prefixcmp(remote->url[0], "https://"))
 388                         ssl_cert_password_required = 1;
 389         }
 390
 391 #ifndef NO_CURL_EASY_DUPHANDLE
 392         curl_default = get_curl_handle();
 393 #endif
 394 }
 395
 396 void http_cleanup(void)
 397 {
 398         struct active_request_slot *slot = active_queue_head;
 399
 400         while (slot != NULL) {
 401                 struct active_request_slot *next = slot->next;
 402                 if (slot->curl != NULL) {
 403 #ifdef USE_CURL_MULTI
 404                         curl_multi_remove_handle(curlm, slot->curl);
 405 #endif
 406                         curl_easy_cleanup(slot->curl);
 407                 }
 408                 free(slot);
 409                 slot = next;
 410         }
 411         active_queue_head = NULL;
 412
 413 #ifndef NO_CURL_EASY_DUPHANDLE
 414         curl_easy_cleanup(curl_default);
 415 #endif
 416
 417 #ifdef USE_CURL_MULTI
 418         curl_multi_cleanup(curlm);
 419 #endif
 420         curl_global_cleanup();
 421
 422         curl_slist_free_all(pragma_header);
 423         pragma_header = NULL;
 424
 425         curl_slist_free_all(no_pragma_header);
 426         no_pragma_header = NULL;
 427
 428         if (curl_http_proxy) {
 429                 free((void *)curl_http_proxy);
 430                 curl_http_proxy = NULL;
 431         }
 432
 433         if (ssl_cert_password != NULL) {
 434                 memset(ssl_cert_password, 0, strlen(ssl_cert_password));
 435                 free(ssl_cert_password);
 436                 ssl_cert_password = NULL;
 437         }
 438         ssl_cert_password_required = 0;
 439 }
 440
 441 struct active_request_slot *get_active_slot(void)
 442 {
 443         struct active_request_slot *slot = active_queue_head;
 444         struct active_request_slot *newslot;
 445
 446 #ifdef USE_CURL_MULTI
 447         int num_transfers;
 448
 449         /* Wait for a slot to open up if the queue is full */
 450         while (active_requests >= max_requests) {
 451                 curl_multi_perform(curlm, &num_transfers);
 452                 if (num_transfers < active_requests)
 453                         process_curl_messages();
 454         }
 455 #endif
 456
 457         while (slot != NULL && slot->in_use)
 458                 slot = slot->next;
 459
 460         if (slot == NULL) {
 461                 newslot = xmalloc(sizeof(*newslot));
 462                 newslot->curl = NULL;
 463                 newslot->in_use = 0;
 464                 newslot->next = NULL;
 465
 466                 slot = active_queue_head;
 467                 if (slot == NULL) {
 468                         active_queue_head = newslot;
 469                 } else {
 470                         while (slot->next != NULL)
 471                                 slot = slot->next;
 472                         slot->next = newslot;
 473                 }
 474                 slot = newslot;
 475         }
 476
 477         if (slot->curl == NULL) {
 478 #ifdef NO_CURL_EASY_DUPHANDLE
 479                 slot->curl = get_curl_handle();
 480 #else
 481                 slot->curl = curl_easy_duphandle(curl_default);
 482 #endif
 483         }
 484
 485         active_requests++;
 486         slot->in_use = 1;
 487         slot->local = NULL;
 488         slot->results = NULL;
 489         slot->finished = NULL;
 490         slot->callback_data = NULL;
 491         slot->callback_func = NULL;
 492         curl_easy_setopt(slot->curl, CURLOPT_HTTPHEADER, pragma_header);
 493         curl_easy_setopt(slot->curl, CURLOPT_ERRORBUFFER, curl_errorstr);
 494         curl_easy_setopt(slot->curl, CURLOPT_CUSTOMREQUEST, NULL);
 495         curl_easy_setopt(slot->curl, CURLOPT_READFUNCTION, NULL);
 496         curl_easy_setopt(slot->curl, CURLOPT_WRITEFUNCTION, NULL);
 497         curl_easy_setopt(slot->curl, CURLOPT_UPLOAD, 0);
 498         curl_easy_setopt(slot->curl, CURLOPT_HTTPGET, 1);
 499
 500         return slot;
 501 }
 502
 503 int start_active_slot(struct active_request_slot *slot)
 504 {
 505 #ifdef USE_CURL_MULTI
 506         CURLMcode curlm_result = curl_multi_add_handle(curlm, slot->curl);
 507         int num_transfers;
 508
 509         if (curlm_result != CURLM_OK &&
 510             curlm_result != CURLM_CALL_MULTI_PERFORM) {
 511                 active_requests--;
 512                 slot->in_use = 0;
 513                 return 0;
 514         }
 515
 516         /*
 517          * We know there must be something to do, since we just added
 518          * something.
 519          */
 520         curl_multi_perform(curlm, &num_transfers);
 521 #endif
 522         return 1;
 523 }
 524
 525 #ifdef USE_CURL_MULTI
 526 struct fill_chain {
 527         void *data;
 528         int (*fill)(void *);
 529         struct fill_chain *next;
 530 };
 531
 532 static struct fill_chain *fill_cfg;
 533
 534 void add_fill_function(void *data, int (*fill)(void *))
 535 {
 536         struct fill_chain *new = xmalloc(sizeof(*new));
 537         struct fill_chain **linkp = &fill_cfg;
 538         new->data = data;
 539         new->fill = fill;
 540         new->next = NULL;
 541         while (*linkp)
 542                 linkp = &(*linkp)->next;
 543         *linkp = new;
 544 }
 545
 546 void fill_active_slots(void)
 547 {
 548         struct active_request_slot *slot = active_queue_head;
 549
 550         while (active_requests < max_requests) {
 551                 struct fill_chain *fill;
 552                 for (fill = fill_cfg; fill; fill = fill->next)
 553                         if (fill->fill(fill->data))
 554                                 break;
 555
 556                 if (!fill)
 557                         break;
 558         }
 559
 560         while (slot != NULL) {
 561                 if (!slot->in_use && slot->curl != NULL) {
 562                         curl_easy_cleanup(slot->curl);
 563                         slot->curl = NULL;
 564                 }
 565                 slot = slot->next;
 566         }
 567 }
 568
 569 void step_active_slots(void)
 570 {
 571         int num_transfers;
 572         CURLMcode curlm_result;
 573
 574         do {
 575                 curlm_result = curl_multi_perform(curlm, &num_transfers);
 576         } while (curlm_result == CURLM_CALL_MULTI_PERFORM);
 577         if (num_transfers < active_requests) {
 578                 process_curl_messages();
 579                 fill_active_slots();
 580         }
 581 }
 582 #endif
 583
 584 void run_active_slot(struct active_request_slot *slot)
 585 {
 586 #ifdef USE_CURL_MULTI
 587         long last_pos = 0;
 588         long current_pos;
 589         fd_set readfds;
 590         fd_set writefds;
 591         fd_set excfds;
 592         int max_fd;
 593         struct timeval select_timeout;
 594         int finished = 0;
 595
 596         slot->finished = &finished;
 597         while (!finished) {
 598                 data_received = 0;
 599                 step_active_slots();
 600
 601                 if (!data_received && slot->local != NULL) {
 602                         current_pos = ftell(slot->local);
 603                         if (current_pos > last_pos)
 604                                 data_received++;
 605                         last_pos = current_pos;
 606                 }
 607
 608                 if (slot->in_use && !data_received) {
 609                         max_fd = 0;
 610                         FD_ZERO(&readfds);
 611                         FD_ZERO(&writefds);
 612                         FD_ZERO(&excfds);
 613                         select_timeout.tv_sec = 0;
 614                         select_timeout.tv_usec = 50000;
 615                         select(max_fd, &readfds, &writefds,
 616                                &excfds, &select_timeout);
 617                 }
 618         }
 619 #else
 620         while (slot->in_use) {
 621                 slot->curl_result = curl_easy_perform(slot->curl);
 622                 finish_active_slot(slot);
 623         }
 624 #endif
 625 }
 626
 627 static void closedown_active_slot(struct active_request_slot *slot)
 628 {
 629         active_requests--;
 630         slot->in_use = 0;
 631 }
 632
 633 void release_active_slot(struct active_request_slot *slot)
 634 {
 635         closedown_active_slot(slot);
 636         if (slot->curl) {
 637 #ifdef USE_CURL_MULTI
 638                 curl_multi_remove_handle(curlm, slot->curl);
 639 #endif
 640                 curl_easy_cleanup(slot->curl);
 641                 slot->curl = NULL;
 642         }
 643 #ifdef USE_CURL_MULTI
 644         fill_active_slots();
 645 #endif
 646 }
 647
 648 void finish_active_slot(struct active_request_slot *slot)
 649 {
 650         closedown_active_slot(slot);
 651         curl_easy_getinfo(slot->curl, CURLINFO_HTTP_CODE, &slot->http_code);
 652
 653         if (slot->finished != NULL)
 654                 (*slot->finished) = 1;
 655
 656         /* Store slot results so they can be read after the slot is reused */
 657         if (slot->results != NULL) {
 658                 slot->results->curl_result = slot->curl_result;
 659                 slot->results->http_code = slot->http_code;
 660         }
 661
 662         /* Run callback if appropriate */
 663         if (slot->callback_func != NULL)
 664                 slot->callback_func(slot->callback_data);
 665 }
 666
 667 void finish_all_active_slots(void)
 668 {
 669         struct active_request_slot *slot = active_queue_head;
 670
 671         while (slot != NULL)
 672                 if (slot->in_use) {
 673                         run_active_slot(slot);
 674                         slot = active_queue_head;
 675                 } else {
 676                         slot = slot->next;
 677                 }
 678 }
 679
 680 /* Helpers for modifying and creating URLs */
 681 static inline int needs_quote(int ch)
 682 {
 683         if (((ch >= 'A') && (ch <= 'Z'))
 684                         || ((ch >= 'a') && (ch <= 'z'))
 685                         || ((ch >= '0') && (ch <= '9'))
 686                         || (ch == '/')
 687                         || (ch == '-')
 688                         || (ch == '.'))
 689                 return 0;
 690         return 1;
 691 }
 692
 693 static inline int hex(int v)
 694 {
 695         if (v < 10)
 696                 return '0' + v;
 697         else
 698                 return 'A' + v - 10;
 699 }
 700
 701 static void end_url_with_slash(struct strbuf *buf, const char *url)
 702 {
 703         strbuf_addstr(buf, url);
 704         if (buf->len && buf->buf[buf->len - 1] != '/')
 705                 strbuf_addstr(buf, "/");
 706 }
 707
 708 static char *quote_ref_url(const char *base, const char *ref)
 709 {
 710         struct strbuf buf = STRBUF_INIT;
 711         const char *cp;
 712         int ch;
 713
 714         end_url_with_slash(&buf, base);
 715
 716         for (cp = ref; (ch = *cp) != 0; cp++)
 717                 if (needs_quote(ch))
 718                         strbuf_addf(&buf, "%%%02x", ch);
 719                 else
 720                         strbuf_addch(&buf, *cp);
 721
 722         return strbuf_detach(&buf, NULL);
 723 }
 724
 725 void append_remote_object_url(struct strbuf *buf, const char *url,
 726                               const char *hex,
 727                               int only_two_digit_prefix)
 728 {
 729         end_url_with_slash(buf, url);
 730
 731         strbuf_addf(buf, "objects/%.*s/", 2, hex);
 732         if (!only_two_digit_prefix)
 733                 strbuf_addf(buf, "%s", hex+2);
 734 }
 735
 736 char *get_remote_object_url(const char *url, const char *hex,
 737                             int only_two_digit_prefix)
 738 {
 739         struct strbuf buf = STRBUF_INIT;
 740         append_remote_object_url(&buf, url, hex, only_two_digit_prefix);
 741         return strbuf_detach(&buf, NULL);
 742 }
 743
 744 /* http_request() targets */
 745 #define HTTP_REQUEST_STRBUF     0
 746 #define HTTP_REQUEST_FILE       1
 747
 748 static int http_request(const char *url, void *result, int target, int options)
 749 {
 750         struct active_request_slot *slot;
 751         struct slot_results results;
 752         struct curl_slist *headers = NULL;
 753         struct strbuf buf = STRBUF_INIT;
 754         int ret;
 755
 756         slot = get_active_slot();
 757         slot->results = &results;
 758         curl_easy_setopt(slot->curl, CURLOPT_HTTPGET, 1);
 759
 760         if (result == NULL) {
 761                 curl_easy_setopt(slot->curl, CURLOPT_NOBODY, 1);
 762         } else {
 763                 curl_easy_setopt(slot->curl, CURLOPT_NOBODY, 0);
 764                 curl_easy_setopt(slot->curl, CURLOPT_FILE, result);
 765
 766                 if (target == HTTP_REQUEST_FILE) {
 767                         long posn = ftell(result);
 768                         curl_easy_setopt(slot->curl, CURLOPT_WRITEFUNCTION,
 769                                          fwrite);
 770                         if (posn > 0) {
 771                                 strbuf_addf(&buf, "Range: bytes=%ld-", posn);
 772                                 headers = curl_slist_append(headers, buf.buf);
 773                                 strbuf_reset(&buf);
 774                         }
 775                         slot->local = result;
 776                 } else
 777                         curl_easy_setopt(slot->curl, CURLOPT_WRITEFUNCTION,
 778                                          fwrite_buffer);
 779         }
 780
 781         strbuf_addstr(&buf, "Pragma:");
 782         if (options & HTTP_NO_CACHE)
 783                 strbuf_addstr(&buf, " no-cache");
 784
 785         headers = curl_slist_append(headers, buf.buf);
 786
 787         curl_easy_setopt(slot->curl, CURLOPT_URL, url);
 788         curl_easy_setopt(slot->curl, CURLOPT_HTTPHEADER, headers);
 789
 790         if (start_active_slot(slot)) {
 791                 run_active_slot(slot);
 792                 if (results.curl_result == CURLE_OK)
 793                         ret = HTTP_OK;
 794                 else if (missing_target(&results))
 795                         ret = HTTP_MISSING_TARGET;
 796                 else
 797                         ret = HTTP_ERROR;
 798         } else {
 799                 error("Unable to start HTTP request for %s", url);
 800                 ret = HTTP_START_FAILED;
 801         }
 802
 803         slot->local = NULL;
 804         curl_slist_free_all(headers);
 805         strbuf_release(&buf);
 806
 807         return ret;
 808 }
 809
 810 int http_get_strbuf(const char *url, struct strbuf *result, int options)
 811 {
 812         return http_request(url, result, HTTP_REQUEST_STRBUF, options);
 813 }
 814
 815 int http_get_file(const char *url, const char *filename, int options)
 816 {
 817         int ret;
 818         struct strbuf tmpfile = STRBUF_INIT;
 819         FILE *result;
 820
 821         strbuf_addf(&tmpfile, "%s.temp", filename);
 822         result = fopen(tmpfile.buf, "a");
 823         if (! result) {
 824                 error("Unable to open local file %s", tmpfile.buf);
 825                 ret = HTTP_ERROR;
 826                 goto cleanup;
 827         }
 828
 829         ret = http_request(url, result, HTTP_REQUEST_FILE, options);
 830         fclose(result);
 831
 832         if ((ret == HTTP_OK) && move_temp_to_file(tmpfile.buf, filename))
 833                 ret = HTTP_ERROR;
 834 cleanup:
 835         strbuf_release(&tmpfile);
 836         return ret;
 837 }
 838
 839 int http_error(const char *url, int ret)
 840 {
 841         /* http_request has already handled HTTP_START_FAILED. */
 842         if (ret != HTTP_START_FAILED)
 843                 error("%s while accessing %s\n", curl_errorstr, url);
 844
 845         return ret;
 846 }
 847
 848 int http_fetch_ref(const char *base, struct ref *ref)
 849 {
 850         char *url;
 851         struct strbuf buffer = STRBUF_INIT;
 852         int ret = -1;
 853
 854         url = quote_ref_url(base, ref->name);
 855         if (http_get_strbuf(url, &buffer, HTTP_NO_CACHE) == HTTP_OK) {
 856                 strbuf_rtrim(&buffer);
 857                 if (buffer.len == 40)
 858                         ret = get_sha1_hex(buffer.buf, ref->old_sha1);
 859                 else if (!prefixcmp(buffer.buf, "ref: ")) {
 860                         ref->symref = xstrdup(buffer.buf + 5);
 861                         ret = 0;
 862                 }
 863         }
 864
 865         strbuf_release(&buffer);
 866         free(url);
 867         return ret;
 868 }
 869
 870 /* Helpers for fetching packs */
 871 static int fetch_pack_index(unsigned char *sha1, const char *base_url)
 872 {
 873         int ret = 0;
 874         char *hex = xstrdup(sha1_to_hex(sha1));
 875         char *filename;
 876         char *url = NULL;
 877         struct strbuf buf = STRBUF_INIT;
 878
 879         if (has_pack_index(sha1)) {
 880                 ret = 0;
 881                 goto cleanup;
 882         }
 883
 884         if (http_is_verbose)
 885                 fprintf(stderr, "Getting index for pack %s\n", hex);
 886
 887         end_url_with_slash(&buf, base_url);
 888         strbuf_addf(&buf, "objects/pack/pack-%s.idx", hex);
 889         url = strbuf_detach(&buf, NULL);
 890
 891         filename = sha1_pack_index_name(sha1);
 892         if (http_get_file(url, filename, 0) != HTTP_OK)
 893                 ret = error("Unable to get pack index %s\n", url);
 894
 895 cleanup:
 896         free(hex);
 897         free(url);
 898         return ret;
 899 }
 900
 901 static int fetch_and_setup_pack_index(struct packed_git **packs_head,
 902         unsigned char *sha1, const char *base_url)
 903 {
 904         struct packed_git *new_pack;
 905
 906         if (fetch_pack_index(sha1, base_url))
 907                 return -1;
 908
 909         new_pack = parse_pack_index(sha1);
 910         if (!new_pack)
 911                 return -1; /* parse_pack_index() already issued error message */
 912         new_pack->next = *packs_head;
 913         *packs_head = new_pack;
 914         return 0;
 915 }
 916
 917 int http_get_info_packs(const char *base_url, struct packed_git **packs_head)
 918 {
 919         int ret = 0, i = 0;
 920         char *url, *data;
 921         struct strbuf buf = STRBUF_INIT;
 922         unsigned char sha1[20];
 923
 924         end_url_with_slash(&buf, base_url);
 925         strbuf_addstr(&buf, "objects/info/packs");
 926         url = strbuf_detach(&buf, NULL);
 927
 928         ret = http_get_strbuf(url, &buf, HTTP_NO_CACHE);
 929         if (ret != HTTP_OK)
 930                 goto cleanup;
 931
 932         data = buf.buf;
 933         while (i < buf.len) {
 934                 switch (data[i]) {
 935                 case 'P':
 936                         i++;
 937                         if (i + 52 <= buf.len &&
 938                             !prefixcmp(data + i, " pack-") &&
 939                             !prefixcmp(data + i + 46, ".pack\n")) {
 940                                 get_sha1_hex(data + i + 6, sha1);
 941                                 fetch_and_setup_pack_index(packs_head, sha1,
 942                                                       base_url);
 943                                 i += 51;
 944                                 break;
 945                         }
 946                 default:
 947                         while (i < buf.len && data[i] != '\n')
 948                                 i++;
 949                 }
 950                 i++;
 951         }
 952
 953 cleanup:
 954         free(url);
 955         return ret;
 956 }
 957
 958 void release_http_pack_request(struct http_pack_request *preq)
 959 {
 960         if (preq->packfile != NULL) {
 961                 fclose(preq->packfile);
 962                 preq->packfile = NULL;
 963                 preq->slot->local = NULL;
 964         }
 965         if (preq->range_header != NULL) {
 966                 curl_slist_free_all(preq->range_header);
 967                 preq->range_header = NULL;
 968         }
 969         preq->slot = NULL;
 970         free(preq->url);
 971 }
 972
 973 int finish_http_pack_request(struct http_pack_request *preq)
 974 {
 975         int ret;
 976         struct packed_git **lst;
 977
 978         preq->target->pack_size = ftell(preq->packfile);
 979
 980         if (preq->packfile != NULL) {
 981                 fclose(preq->packfile);
 982                 preq->packfile = NULL;
 983                 preq->slot->local = NULL;
 984         }
 985
 986         ret = move_temp_to_file(preq->tmpfile, preq->filename);
 987         if (ret)
 988                 return ret;
 989
 990         lst = preq->lst;
 991         while (*lst != preq->target)
 992                 lst = &((*lst)->next);
 993         *lst = (*lst)->next;
 994
 995         if (verify_pack(preq->target))
 996                 return -1;
 997         install_packed_git(preq->target);
 998
 999         return 0;
1000 }
1001
1002 struct http_pack_request *new_http_pack_request(
1003         struct packed_git *target, const char *base_url)
1004 {
1005         char *filename;
1006         long prev_posn = 0;
1007         char range[RANGE_HEADER_SIZE];
1008         struct strbuf buf = STRBUF_INIT;
1009         struct http_pack_request *preq;
1010
1011         preq = xmalloc(sizeof(*preq));
1012         preq->target = target;
1013         preq->range_header = NULL;
1014
1015         end_url_with_slash(&buf, base_url);
1016         strbuf_addf(&buf, "objects/pack/pack-%s.pack",
1017                 sha1_to_hex(target->sha1));
1018         preq->url = strbuf_detach(&buf, NULL);
1019
1020         filename = sha1_pack_name(target->sha1);
1021         snprintf(preq->filename, sizeof(preq->filename), "%s", filename);
1022         snprintf(preq->tmpfile, sizeof(preq->tmpfile), "%s.temp", filename);
1023         preq->packfile = fopen(preq->tmpfile, "a");
1024         if (!preq->packfile) {
1025                 error("Unable to open local file %s for pack",
1026                       preq->tmpfile);
1027                 goto abort;
1028         }
1029
1030         preq->slot = get_active_slot();
1031         preq->slot->local = preq->packfile;
1032         curl_easy_setopt(preq->slot->curl, CURLOPT_FILE, preq->packfile);
1033         curl_easy_setopt(preq->slot->curl, CURLOPT_WRITEFUNCTION, fwrite);
1034         curl_easy_setopt(preq->slot->curl, CURLOPT_URL, preq->url);
1035         curl_easy_setopt(preq->slot->curl, CURLOPT_HTTPHEADER,
1036                 no_pragma_header);
1037
1038         /*
1039          * If there is data present from a previous transfer attempt,
1040          * resume where it left off
1041          */
1042         prev_posn = ftell(preq->packfile);
1043         if (prev_posn>0) {
1044                 if (http_is_verbose)
1045                         fprintf(stderr,
1046                                 "Resuming fetch of pack %s at byte %ld\n",
1047                                 sha1_to_hex(target->sha1), prev_posn);
1048                 sprintf(range, "Range: bytes=%ld-", prev_posn);
1049                 preq->range_header = curl_slist_append(NULL, range);
1050                 curl_easy_setopt(preq->slot->curl, CURLOPT_HTTPHEADER,
1051                         preq->range_header);
1052         }
1053
1054         return preq;
1055
1056 abort:
1057         free(filename);
1058         free(preq->url);
1059         free(preq);
1060         return NULL;
1061 }
1062
1063 /* Helpers for fetching objects (loose) */
1064 static size_t fwrite_sha1_file(void *ptr, size_t eltsize, size_t nmemb,
1065                                void *data)
1066 {
1067         unsigned char expn[4096];
1068         size_t size = eltsize * nmemb;
1069         int posn = 0;
1070         struct http_object_request *freq =
1071                 (struct http_object_request *)data;
1072         do {
1073                 ssize_t retval = xwrite(freq->localfile,
1074                                         (char *) ptr + posn, size - posn);
1075                 if (retval < 0)
1076                         return posn;
1077                 posn += retval;
1078         } while (posn < size);
1079
1080         freq->stream.avail_in = size;
1081         freq->stream.next_in = ptr;
1082         do {
1083                 freq->stream.next_out = expn;
1084                 freq->stream.avail_out = sizeof(expn);
1085                 freq->zret = git_inflate(&freq->stream, Z_SYNC_FLUSH);
1086                 git_SHA1_Update(&freq->c, expn,
1087                                 sizeof(expn) - freq->stream.avail_out);
1088         } while (freq->stream.avail_in && freq->zret == Z_OK);
1089         data_received++;
1090         return size;
1091 }
1092
1093 struct http_object_request *new_http_object_request(const char *base_url,
1094         unsigned char *sha1)
1095 {
1096         char *hex = sha1_to_hex(sha1);
1097         char *filename;
1098         char prevfile[PATH_MAX];
1099         int prevlocal;
1100         unsigned char prev_buf[PREV_BUF_SIZE];
1101         ssize_t prev_read = 0;
1102         long prev_posn = 0;
1103         char range[RANGE_HEADER_SIZE];
1104         struct curl_slist *range_header = NULL;
1105         struct http_object_request *freq;
1106
1107         freq = xmalloc(sizeof(*freq));
1108         hashcpy(freq->sha1, sha1);
1109         freq->localfile = -1;
1110
1111         filename = sha1_file_name(sha1);
1112         snprintf(freq->filename, sizeof(freq->filename), "%s", filename);
1113         snprintf(freq->tmpfile, sizeof(freq->tmpfile),
1114                  "%s.temp", filename);
1115
1116         snprintf(prevfile, sizeof(prevfile), "%s.prev", filename);
1117         unlink_or_warn(prevfile);
1118         rename(freq->tmpfile, prevfile);
1119         unlink_or_warn(freq->tmpfile);
1120
1121         if (freq->localfile != -1)
1122                 error("fd leakage in start: %d", freq->localfile);
1123         freq->localfile = open(freq->tmpfile,
1124                                O_WRONLY | O_CREAT | O_EXCL, 0666);
1125         /*
1126          * This could have failed due to the "lazy directory creation";
1127          * try to mkdir the last path component.
1128          */
1129         if (freq->localfile < 0 && errno == ENOENT) {
1130                 char *dir = strrchr(freq->tmpfile, '/');
1131                 if (dir) {
1132                         *dir = 0;
1133                         mkdir(freq->tmpfile, 0777);
1134                         *dir = '/';
1135                 }
1136                 freq->localfile = open(freq->tmpfile,
1137                                        O_WRONLY | O_CREAT | O_EXCL, 0666);
1138         }
1139
1140         if (freq->localfile < 0) {
1141                 error("Couldn't create temporary file %s for %s: %s",
1142                       freq->tmpfile, freq->filename, strerror(errno));
1143                 goto abort;
1144         }
1145
1146         memset(&freq->stream, 0, sizeof(freq->stream));
1147
1148         git_inflate_init(&freq->stream);
1149
1150         git_SHA1_Init(&freq->c);
1151
1152         freq->url = get_remote_object_url(base_url, hex, 0);
1153
1154         /*
1155          * If a previous temp file is present, process what was already
1156          * fetched.
1157          */
1158         prevlocal = open(prevfile, O_RDONLY);
1159         if (prevlocal != -1) {
1160                 do {
1161                         prev_read = xread(prevlocal, prev_buf, PREV_BUF_SIZE);
1162                         if (prev_read>0) {
1163                                 if (fwrite_sha1_file(prev_buf,
1164                                                      1,
1165                                                      prev_read,
1166                                                      freq) == prev_read) {
1167                                         prev_posn += prev_read;
1168                                 } else {
1169                                         prev_read = -1;
1170                                 }
1171                         }
1172                 } while (prev_read > 0);
1173                 close(prevlocal);
1174         }
1175         unlink_or_warn(prevfile);
1176
1177         /*
1178          * Reset inflate/SHA1 if there was an error reading the previous temp
1179          * file; also rewind to the beginning of the local file.
1180          */
1181         if (prev_read == -1) {
1182                 memset(&freq->stream, 0, sizeof(freq->stream));
1183                 git_inflate_init(&freq->stream);
1184                 git_SHA1_Init(&freq->c);
1185                 if (prev_posn>0) {
1186                         prev_posn = 0;
1187                         lseek(freq->localfile, 0, SEEK_SET);
1188                         if (ftruncate(freq->localfile, 0) < 0) {
1189                                 error("Couldn't truncate temporary file %s for %s: %s",
1190                                           freq->tmpfile, freq->filename, strerror(errno));
1191                                 goto abort;
1192                         }
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, freq->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 abort:
1222         free(filename);
1223         free(freq->url);
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         if (freq->slot != NULL) {
1289                 freq->slot->callback_func = NULL;
1290                 freq->slot->callback_data = NULL;
1291                 release_active_slot(freq->slot);
1292                 freq->slot = NULL;
1293         }
1294 }