http.c

   1 #include "http.h"
   2 #include "pack.h"
   3 #include "exec_cmd.h"
   4
   5 int data_received;
   6 int active_requests;
   7 int http_is_verbose;
   8
   9 #ifdef USE_CURL_MULTI
  10 static int max_requests = -1;
  11 static CURLM *curlm;
  12 #endif
  13 #ifndef NO_CURL_EASY_DUPHANDLE
  14 static CURL *curl_default;
  15 #endif
  16
  17 #define PREV_BUF_SIZE 4096
  18 #define RANGE_HEADER_SIZE 30
  19
  20 char curl_errorstr[CURL_ERROR_SIZE];
  21
  22 static int curl_ssl_verify = -1;
  23 static const char *ssl_cert;
  24 #if LIBCURL_VERSION_NUM >= 0x070903
  25 static const char *ssl_key;
  26 #endif
  27 #if LIBCURL_VERSION_NUM >= 0x070908
  28 static const char *ssl_capath;
  29 #endif
  30 static const char *ssl_cainfo;
  31 static long curl_low_speed_limit = -1;
  32 static long curl_low_speed_time = -1;
  33 static int curl_ftp_no_epsv;
  34 static const char *curl_http_proxy;
  35 static char *user_name, *user_pass;
  36
  37 #if LIBCURL_VERSION_NUM >= 0x071700
  38 /* Use CURLOPT_KEYPASSWD as is */
  39 #elif LIBCURL_VERSION_NUM >= 0x070903
  40 #define CURLOPT_KEYPASSWD CURLOPT_SSLKEYPASSWD
  41 #else
  42 #define CURLOPT_KEYPASSWD CURLOPT_SSLCERTPASSWD
  43 #endif
  44
  45 static char *ssl_cert_password;
  46 static int ssl_cert_password_required;
  47
  48 static struct curl_slist *pragma_header;
  49 static struct curl_slist *no_pragma_header;
  50
  51 static struct active_request_slot *active_queue_head;
  52
  53 size_t fread_buffer(void *ptr, size_t eltsize, size_t nmemb, void *buffer_)
  54 {
  55         size_t size = eltsize * nmemb;
  56         struct buffer *buffer = buffer_;
  57
  58         if (size > buffer->buf.len - buffer->posn)
  59                 size = buffer->buf.len - buffer->posn;
  60         memcpy(ptr, buffer->buf.buf + buffer->posn, size);
  61         buffer->posn += size;
  62
  63         return size;
  64 }
  65
  66 #ifndef NO_CURL_IOCTL
  67 curlioerr ioctl_buffer(CURL *handle, int cmd, void *clientp)
  68 {
  69         struct buffer *buffer = clientp;
  70
  71         switch (cmd) {
  72         case CURLIOCMD_NOP:
  73                 return CURLIOE_OK;
  74
  75         case CURLIOCMD_RESTARTREAD:
  76                 buffer->posn = 0;
  77                 return CURLIOE_OK;
  78
  79         default:
  80                 return CURLIOE_UNKNOWNCMD;
  81         }
  82 }
  83 #endif
  84
  85 size_t fwrite_buffer(const void *ptr, size_t eltsize, size_t nmemb, void *buffer_)
  86 {
  87         size_t size = eltsize * nmemb;
  88         struct strbuf *buffer = buffer_;
  89
  90         strbuf_add(buffer, ptr, size);
  91         data_received++;
  92         return size;
  93 }
  94
  95 size_t fwrite_null(const void *ptr, size_t eltsize, size_t nmemb, void *strbuf)
  96 {
  97         data_received++;
  98         return eltsize * nmemb;
  99 }
 100
 101 static void finish_active_slot(struct active_request_slot *slot);
 102
 103 #ifdef USE_CURL_MULTI
 104 static void process_curl_messages(void)
 105 {
 106         int num_messages;
 107         struct active_request_slot *slot;
 108         CURLMsg *curl_message = curl_multi_info_read(curlm, &num_messages);
 109
 110         while (curl_message != NULL) {
 111                 if (curl_message->msg == CURLMSG_DONE) {
 112                         int curl_result = curl_message->data.result;
 113                         slot = active_queue_head;
 114                         while (slot != NULL &&
 115                                slot->curl != curl_message->easy_handle)
 116                                 slot = slot->next;
 117                         if (slot != NULL) {
 118                                 curl_multi_remove_handle(curlm, slot->curl);
 119                                 slot->curl_result = curl_result;
 120                                 finish_active_slot(slot);
 121                         } else {
 122                                 fprintf(stderr, "Received DONE message for unknown request!\n");
 123                         }
 124                 } else {
 125                         fprintf(stderr, "Unknown CURL message received: %d\n",
 126                                 (int)curl_message->msg);
 127                 }
 128                 curl_message = curl_multi_info_read(curlm, &num_messages);
 129         }
 130 }
 131 #endif
 132
 133 static int git_config_path(const char **result,
 134                 const char *var, const char *value)
 135 {
 136         if (git_config_string(result, var, value))
 137                 return 1;
 138         *result = system_path(*result);
 139         return 0;
 140 }
 141
 142 static int http_options(const char *var, const char *value, void *cb)
 143 {
 144         if (!strcmp("http.sslverify", var)) {
 145                 curl_ssl_verify = git_config_bool(var, value);
 146                 return 0;
 147         }
 148         if (!strcmp("http.sslcert", var))
 149                 return git_config_path(&ssl_cert, var, value);
 150 #if LIBCURL_VERSION_NUM >= 0x070903
 151         if (!strcmp("http.sslkey", var))
 152                 return git_config_path(&ssl_key, var, value);
 153 #endif
 154 #if LIBCURL_VERSION_NUM >= 0x070908
 155         if (!strcmp("http.sslcapath", var))
 156                 return git_config_path(&ssl_capath, var, value);
 157 #endif
 158         if (!strcmp("http.sslcainfo", var))
 159                 return git_config_path(&ssl_cainfo, var, value);
 160         if (!strcmp("http.sslcertpasswordprotected", var)) {
 161                 if (git_config_bool(var, value))
 162                         ssl_cert_password_required = 1;
 163                 return 0;
 164         }
 165 #ifdef USE_CURL_MULTI
 166         if (!strcmp("http.maxrequests", var)) {
 167                 max_requests = git_config_int(var, value);
 168                 return 0;
 169         }
 170 #endif
 171         if (!strcmp("http.lowspeedlimit", var)) {
 172                 curl_low_speed_limit = (long)git_config_int(var, value);
 173                 return 0;
 174         }
 175         if (!strcmp("http.lowspeedtime", var)) {
 176                 curl_low_speed_time = (long)git_config_int(var, value);
 177                 return 0;
 178         }
 179
 180         if (!strcmp("http.noepsv", var)) {
 181                 curl_ftp_no_epsv = git_config_bool(var, value);
 182                 return 0;
 183         }
 184         if (!strcmp("http.proxy", var))
 185                 return git_config_string(&curl_http_proxy, var, value);
 186
 187         /* Fall back on the default ones */
 188         return git_default_config(var, value, cb);
 189 }
 190
 191 static void init_curl_http_auth(CURL *result)
 192 {
 193         if (user_name) {
 194                 struct strbuf up = STRBUF_INIT;
 195                 if (!user_pass)
 196                         user_pass = xstrdup(getpass("Password: "));
 197                 strbuf_addf(&up, "%s:%s", user_name, user_pass);
 198                 curl_easy_setopt(result, CURLOPT_USERPWD,
 199                                  strbuf_detach(&up, NULL));
 200         }
 201 }
 202
 203 static int has_cert_password(void)
 204 {
 205         if (ssl_cert_password != NULL)
 206                 return 1;
 207         if (ssl_cert == NULL || ssl_cert_password_required != 1)
 208                 return 0;
 209         /* Only prompt the user once. */
 210         ssl_cert_password_required = -1;
 211         ssl_cert_password = getpass("Certificate Password: ");
 212         if (ssl_cert_password != NULL) {
 213                 ssl_cert_password = xstrdup(ssl_cert_password);
 214                 return 1;
 215         } else
 216                 return 0;
 217 }
 218
 219 static CURL *get_curl_handle(void)
 220 {
 221         CURL *result = curl_easy_init();
 222
 223         if (!curl_ssl_verify) {
 224                 curl_easy_setopt(result, CURLOPT_SSL_VERIFYPEER, 0);
 225                 curl_easy_setopt(result, CURLOPT_SSL_VERIFYHOST, 0);
 226         } else {
 227                 /* Verify authenticity of the peer's certificate */
 228                 curl_easy_setopt(result, CURLOPT_SSL_VERIFYPEER, 1);
 229                 /* The name in the cert must match whom we tried to connect */
 230                 curl_easy_setopt(result, CURLOPT_SSL_VERIFYHOST, 2);
 231         }
 232
 233 #if LIBCURL_VERSION_NUM >= 0x070907
 234         curl_easy_setopt(result, CURLOPT_NETRC, CURL_NETRC_OPTIONAL);
 235 #endif
 236
 237         init_curl_http_auth(result);
 238
 239         if (ssl_cert != NULL)
 240                 curl_easy_setopt(result, CURLOPT_SSLCERT, ssl_cert);
 241         if (has_cert_password())
 242                 curl_easy_setopt(result, CURLOPT_KEYPASSWD, ssl_cert_password);
 243 #if LIBCURL_VERSION_NUM >= 0x070903
 244         if (ssl_key != NULL)
 245                 curl_easy_setopt(result, CURLOPT_SSLKEY, ssl_key);
 246 #endif
 247 #if LIBCURL_VERSION_NUM >= 0x070908
 248         if (ssl_capath != NULL)
 249                 curl_easy_setopt(result, CURLOPT_CAPATH, ssl_capath);
 250 #endif
 251         if (ssl_cainfo != NULL)
 252                 curl_easy_setopt(result, CURLOPT_CAINFO, ssl_cainfo);
 253         curl_easy_setopt(result, CURLOPT_FAILONERROR, 1);
 254
 255         if (curl_low_speed_limit > 0 && curl_low_speed_time > 0) {
 256                 curl_easy_setopt(result, CURLOPT_LOW_SPEED_LIMIT,
 257                                  curl_low_speed_limit);
 258                 curl_easy_setopt(result, CURLOPT_LOW_SPEED_TIME,
 259                                  curl_low_speed_time);
 260         }
 261
 262         curl_easy_setopt(result, CURLOPT_FOLLOWLOCATION, 1);
 263
 264         if (getenv("GIT_CURL_VERBOSE"))
 265                 curl_easy_setopt(result, CURLOPT_VERBOSE, 1);
 266
 267         curl_easy_setopt(result, CURLOPT_USERAGENT, GIT_USER_AGENT);
 268
 269         if (curl_ftp_no_epsv)
 270                 curl_easy_setopt(result, CURLOPT_FTP_USE_EPSV, 0);
 271
 272         if (curl_http_proxy)
 273                 curl_easy_setopt(result, CURLOPT_PROXY, curl_http_proxy);
 274
 275         return result;
 276 }
 277
 278 static void http_auth_init(const char *url)
 279 {
 280         char *at, *colon, *cp, *slash;
 281         int len;
 282
 283         cp = strstr(url, "://");
 284         if (!cp)
 285                 return;
 286
 287         /*
 288          * Ok, the URL looks like "proto://something".  Which one?
 289          * "proto://<user>:<pass>@<host>/...",
 290          * "proto://<user>@<host>/...", or just
 291          * "proto://<host>/..."?
 292          */
 293         cp += 3;
 294         at = strchr(cp, '@');
 295         colon = strchr(cp, ':');
 296         slash = strchrnul(cp, '/');
 297         if (!at || slash <= at)
 298                 return; /* No credentials */
 299         if (!colon || at <= colon) {
 300                 /* Only username */
 301                 len = at - cp;
 302                 user_name = xmalloc(len + 1);
 303                 memcpy(user_name, cp, len);
 304                 user_name[len] = '\0';
 305                 user_pass = NULL;
 306         } else {
 307                 len = colon - cp;
 308                 user_name = xmalloc(len + 1);
 309                 memcpy(user_name, cp, len);
 310                 user_name[len] = '\0';
 311                 len = at - (colon + 1);
 312                 user_pass = xmalloc(len + 1);
 313                 memcpy(user_pass, colon + 1, len);
 314                 user_pass[len] = '\0';
 315         }
 316 }
 317
 318 static void set_from_env(const char **var, const char *envname)
 319 {
 320         const char *val = getenv(envname);
 321         if (val)
 322                 *var = val;
 323 }
 324
 325 void http_init(struct remote *remote)
 326 {
 327         char *low_speed_limit;
 328         char *low_speed_time;
 329
 330         http_is_verbose = 0;
 331
 332         git_config(http_options, NULL);
 333
 334         curl_global_init(CURL_GLOBAL_ALL);
 335
 336         if (remote && remote->http_proxy)
 337                 curl_http_proxy = xstrdup(remote->http_proxy);
 338
 339         pragma_header = curl_slist_append(pragma_header, "Pragma: no-cache");
 340         no_pragma_header = curl_slist_append(no_pragma_header, "Pragma:");
 341
 342 #ifdef USE_CURL_MULTI
 343         {
 344                 char *http_max_requests = getenv("GIT_HTTP_MAX_REQUESTS");
 345                 if (http_max_requests != NULL)
 346                         max_requests = atoi(http_max_requests);
 347         }
 348
 349         curlm = curl_multi_init();
 350         if (curlm == NULL) {
 351                 fprintf(stderr, "Error creating curl multi handle.\n");
 352                 exit(1);
 353         }
 354 #endif
 355
 356         if (getenv("GIT_SSL_NO_VERIFY"))
 357                 curl_ssl_verify = 0;
 358
 359         set_from_env(&ssl_cert, "GIT_SSL_CERT");
 360 #if LIBCURL_VERSION_NUM >= 0x070903
 361         set_from_env(&ssl_key, "GIT_SSL_KEY");
 362 #endif
 363 #if LIBCURL_VERSION_NUM >= 0x070908
 364         set_from_env(&ssl_capath, "GIT_SSL_CAPATH");
 365 #endif
 366         set_from_env(&ssl_cainfo, "GIT_SSL_CAINFO");
 367
 368         low_speed_limit = getenv("GIT_HTTP_LOW_SPEED_LIMIT");
 369         if (low_speed_limit != NULL)
 370                 curl_low_speed_limit = strtol(low_speed_limit, NULL, 10);
 371         low_speed_time = getenv("GIT_HTTP_LOW_SPEED_TIME");
 372         if (low_speed_time != NULL)
 373                 curl_low_speed_time = strtol(low_speed_time, NULL, 10);
 374
 375         if (curl_ssl_verify == -1)
 376                 curl_ssl_verify = 1;
 377
 378 #ifdef USE_CURL_MULTI
 379         if (max_requests < 1)
 380                 max_requests = DEFAULT_MAX_REQUESTS;
 381 #endif
 382
 383         if (getenv("GIT_CURL_FTP_NO_EPSV"))
 384                 curl_ftp_no_epsv = 1;
 385
 386         if (remote && remote->url && remote->url[0]) {
 387                 http_auth_init(remote->url[0]);
 388                 if (!ssl_cert_password_required &&
 389                     getenv("GIT_SSL_CERT_PASSWORD_PROTECTED") &&
 390                     !prefixcmp(remote->url[0], "https://"))
 391                         ssl_cert_password_required = 1;
 392         }
 393
 394 #ifndef NO_CURL_EASY_DUPHANDLE
 395         curl_default = get_curl_handle();
 396 #endif
 397 }
 398
 399 void http_cleanup(void)
 400 {
 401         struct active_request_slot *slot = active_queue_head;
 402
 403         while (slot != NULL) {
 404                 struct active_request_slot *next = slot->next;
 405                 if (slot->curl != NULL) {
 406 #ifdef USE_CURL_MULTI
 407                         curl_multi_remove_handle(curlm, slot->curl);
 408 #endif
 409                         curl_easy_cleanup(slot->curl);
 410                 }
 411                 free(slot);
 412                 slot = next;
 413         }
 414         active_queue_head = NULL;
 415
 416 #ifndef NO_CURL_EASY_DUPHANDLE
 417         curl_easy_cleanup(curl_default);
 418 #endif
 419
 420 #ifdef USE_CURL_MULTI
 421         curl_multi_cleanup(curlm);
 422 #endif
 423         curl_global_cleanup();
 424
 425         curl_slist_free_all(pragma_header);
 426         pragma_header = NULL;
 427
 428         curl_slist_free_all(no_pragma_header);
 429         no_pragma_header = NULL;
 430
 431         if (curl_http_proxy) {
 432                 free((void *)curl_http_proxy);
 433                 curl_http_proxy = NULL;
 434         }
 435
 436         if (ssl_cert_password != NULL) {
 437                 memset(ssl_cert_password, 0, strlen(ssl_cert_password));
 438                 free(ssl_cert_password);
 439                 ssl_cert_password = NULL;
 440         }
 441         ssl_cert_password_required = 0;
 442 }
 443
 444 struct active_request_slot *get_active_slot(void)
 445 {
 446         struct active_request_slot *slot = active_queue_head;
 447         struct active_request_slot *newslot;
 448
 449 #ifdef USE_CURL_MULTI
 450         int num_transfers;
 451
 452         /* Wait for a slot to open up if the queue is full */
 453         while (active_requests >= max_requests) {
 454                 curl_multi_perform(curlm, &num_transfers);
 455                 if (num_transfers < active_requests)
 456                         process_curl_messages();
 457         }
 458 #endif
 459
 460         while (slot != NULL && slot->in_use)
 461                 slot = slot->next;
 462
 463         if (slot == NULL) {
 464                 newslot = xmalloc(sizeof(*newslot));
 465                 newslot->curl = NULL;
 466                 newslot->in_use = 0;
 467                 newslot->next = NULL;
 468
 469                 slot = active_queue_head;
 470                 if (slot == NULL) {
 471                         active_queue_head = newslot;
 472                 } else {
 473                         while (slot->next != NULL)
 474                                 slot = slot->next;
 475                         slot->next = newslot;
 476                 }
 477                 slot = newslot;
 478         }
 479
 480         if (slot->curl == NULL) {
 481 #ifdef NO_CURL_EASY_DUPHANDLE
 482                 slot->curl = get_curl_handle();
 483 #else
 484                 slot->curl = curl_easy_duphandle(curl_default);
 485 #endif
 486         }
 487
 488         active_requests++;
 489         slot->in_use = 1;
 490         slot->local = NULL;
 491         slot->results = NULL;
 492         slot->finished = NULL;
 493         slot->callback_data = NULL;
 494         slot->callback_func = NULL;
 495         curl_easy_setopt(slot->curl, CURLOPT_HTTPHEADER, pragma_header);
 496         curl_easy_setopt(slot->curl, CURLOPT_ERRORBUFFER, curl_errorstr);
 497         curl_easy_setopt(slot->curl, CURLOPT_CUSTOMREQUEST, NULL);
 498         curl_easy_setopt(slot->curl, CURLOPT_READFUNCTION, NULL);
 499         curl_easy_setopt(slot->curl, CURLOPT_WRITEFUNCTION, NULL);
 500         curl_easy_setopt(slot->curl, CURLOPT_UPLOAD, 0);
 501         curl_easy_setopt(slot->curl, CURLOPT_HTTPGET, 1);
 502
 503         return slot;
 504 }
 505
 506 int start_active_slot(struct active_request_slot *slot)
 507 {
 508 #ifdef USE_CURL_MULTI
 509         CURLMcode curlm_result = curl_multi_add_handle(curlm, slot->curl);
 510         int num_transfers;
 511
 512         if (curlm_result != CURLM_OK &&
 513             curlm_result != CURLM_CALL_MULTI_PERFORM) {
 514                 active_requests--;
 515                 slot->in_use = 0;
 516                 return 0;
 517         }
 518
 519         /*
 520          * We know there must be something to do, since we just added
 521          * something.
 522          */
 523         curl_multi_perform(curlm, &num_transfers);
 524 #endif
 525         return 1;
 526 }
 527
 528 #ifdef USE_CURL_MULTI
 529 struct fill_chain {
 530         void *data;
 531         int (*fill)(void *);
 532         struct fill_chain *next;
 533 };
 534
 535 static struct fill_chain *fill_cfg;
 536
 537 void add_fill_function(void *data, int (*fill)(void *))
 538 {
 539         struct fill_chain *new = xmalloc(sizeof(*new));
 540         struct fill_chain **linkp = &fill_cfg;
 541         new->data = data;
 542         new->fill = fill;
 543         new->next = NULL;
 544         while (*linkp)
 545                 linkp = &(*linkp)->next;
 546         *linkp = new;
 547 }
 548
 549 void fill_active_slots(void)
 550 {
 551         struct active_request_slot *slot = active_queue_head;
 552
 553         while (active_requests < max_requests) {
 554                 struct fill_chain *fill;
 555                 for (fill = fill_cfg; fill; fill = fill->next)
 556                         if (fill->fill(fill->data))
 557                                 break;
 558
 559                 if (!fill)
 560                         break;
 561         }
 562
 563         while (slot != NULL) {
 564                 if (!slot->in_use && slot->curl != NULL) {
 565                         curl_easy_cleanup(slot->curl);
 566                         slot->curl = NULL;
 567                 }
 568                 slot = slot->next;
 569         }
 570 }
 571
 572 void step_active_slots(void)
 573 {
 574         int num_transfers;
 575         CURLMcode curlm_result;
 576
 577         do {
 578                 curlm_result = curl_multi_perform(curlm, &num_transfers);
 579         } while (curlm_result == CURLM_CALL_MULTI_PERFORM);
 580         if (num_transfers < active_requests) {
 581                 process_curl_messages();
 582                 fill_active_slots();
 583         }
 584 }
 585 #endif
 586
 587 void run_active_slot(struct active_request_slot *slot)
 588 {
 589 #ifdef USE_CURL_MULTI
 590         long last_pos = 0;
 591         long current_pos;
 592         fd_set readfds;
 593         fd_set writefds;
 594         fd_set excfds;
 595         int max_fd;
 596         struct timeval select_timeout;
 597         int finished = 0;
 598
 599         slot->finished = &finished;
 600         while (!finished) {
 601                 data_received = 0;
 602                 step_active_slots();
 603
 604                 if (!data_received && slot->local != NULL) {
 605                         current_pos = ftell(slot->local);
 606                         if (current_pos > last_pos)
 607                                 data_received++;
 608                         last_pos = current_pos;
 609                 }
 610
 611                 if (slot->in_use && !data_received) {
 612                         max_fd = 0;
 613                         FD_ZERO(&readfds);
 614                         FD_ZERO(&writefds);
 615                         FD_ZERO(&excfds);
 616                         select_timeout.tv_sec = 0;
 617                         select_timeout.tv_usec = 50000;
 618                         select(max_fd, &readfds, &writefds,
 619                                &excfds, &select_timeout);
 620                 }
 621         }
 622 #else
 623         while (slot->in_use) {
 624                 slot->curl_result = curl_easy_perform(slot->curl);
 625                 finish_active_slot(slot);
 626         }
 627 #endif
 628 }
 629
 630 static void closedown_active_slot(struct active_request_slot *slot)
 631 {
 632         active_requests--;
 633         slot->in_use = 0;
 634 }
 635
 636 void release_active_slot(struct active_request_slot *slot)
 637 {
 638         closedown_active_slot(slot);
 639         if (slot->curl) {
 640 #ifdef USE_CURL_MULTI
 641                 curl_multi_remove_handle(curlm, slot->curl);
 642 #endif
 643                 curl_easy_cleanup(slot->curl);
 644                 slot->curl = NULL;
 645         }
 646 #ifdef USE_CURL_MULTI
 647         fill_active_slots();
 648 #endif
 649 }
 650
 651 static void finish_active_slot(struct active_request_slot *slot)
 652 {
 653         closedown_active_slot(slot);
 654         curl_easy_getinfo(slot->curl, CURLINFO_HTTP_CODE, &slot->http_code);
 655
 656         if (slot->finished != NULL)
 657                 (*slot->finished) = 1;
 658
 659         /* Store slot results so they can be read after the slot is reused */
 660         if (slot->results != NULL) {
 661                 slot->results->curl_result = slot->curl_result;
 662                 slot->results->http_code = slot->http_code;
 663         }
 664
 665         /* Run callback if appropriate */
 666         if (slot->callback_func != NULL)
 667                 slot->callback_func(slot->callback_data);
 668 }
 669
 670 void finish_all_active_slots(void)
 671 {
 672         struct active_request_slot *slot = active_queue_head;
 673
 674         while (slot != NULL)
 675                 if (slot->in_use) {
 676                         run_active_slot(slot);
 677                         slot = active_queue_head;
 678                 } else {
 679                         slot = slot->next;
 680                 }
 681 }
 682
 683 /* Helpers for modifying and creating URLs */
 684 static inline int needs_quote(int ch)
 685 {
 686         if (((ch >= 'A') && (ch <= 'Z'))
 687                         || ((ch >= 'a') && (ch <= 'z'))
 688                         || ((ch >= '0') && (ch <= '9'))
 689                         || (ch == '/')
 690                         || (ch == '-')
 691                         || (ch == '.'))
 692                 return 0;
 693         return 1;
 694 }
 695
 696 static inline int hex(int v)
 697 {
 698         if (v < 10)
 699                 return '0' + v;
 700         else
 701                 return 'A' + v - 10;
 702 }
 703
 704 static void end_url_with_slash(struct strbuf *buf, const char *url)
 705 {
 706         strbuf_addstr(buf, url);
 707         if (buf->len && buf->buf[buf->len - 1] != '/')
 708                 strbuf_addstr(buf, "/");
 709 }
 710
 711 static char *quote_ref_url(const char *base, const char *ref)
 712 {
 713         struct strbuf buf = STRBUF_INIT;
 714         const char *cp;
 715         int ch;
 716
 717         end_url_with_slash(&buf, base);
 718
 719         for (cp = ref; (ch = *cp) != 0; cp++)
 720                 if (needs_quote(ch))
 721                         strbuf_addf(&buf, "%%%02x", ch);
 722                 else
 723                         strbuf_addch(&buf, *cp);
 724
 725         return strbuf_detach(&buf, NULL);
 726 }
 727
 728 void append_remote_object_url(struct strbuf *buf, const char *url,
 729                               const char *hex,
 730                               int only_two_digit_prefix)
 731 {
 732         strbuf_addf(buf, "%s/objects/%.*s/", url, 2, hex);
 733         if (!only_two_digit_prefix)
 734                 strbuf_addf(buf, "%s", hex+2);
 735 }
 736
 737 char *get_remote_object_url(const char *url, const char *hex,
 738                             int only_two_digit_prefix)
 739 {
 740         struct strbuf buf = STRBUF_INIT;
 741         append_remote_object_url(&buf, url, hex, only_two_digit_prefix);
 742         return strbuf_detach(&buf, NULL);
 743 }
 744
 745 /* http_request() targets */
 746 #define HTTP_REQUEST_STRBUF     0
 747 #define HTTP_REQUEST_FILE       1
 748
 749 static int http_request(const char *url, void *result, int target, int options)
 750 {
 751         struct active_request_slot *slot;
 752         struct slot_results results;
 753         struct curl_slist *headers = NULL;
 754         struct strbuf buf = STRBUF_INIT;
 755         int ret;
 756
 757         slot = get_active_slot();
 758         slot->results = &results;
 759         curl_easy_setopt(slot->curl, CURLOPT_HTTPGET, 1);
 760
 761         if (result == NULL) {
 762                 curl_easy_setopt(slot->curl, CURLOPT_NOBODY, 1);
 763         } else {
 764                 curl_easy_setopt(slot->curl, CURLOPT_NOBODY, 0);
 765                 curl_easy_setopt(slot->curl, CURLOPT_FILE, result);
 766
 767                 if (target == HTTP_REQUEST_FILE) {
 768                         long posn = ftell(result);
 769                         curl_easy_setopt(slot->curl, CURLOPT_WRITEFUNCTION,
 770                                          fwrite);
 771                         if (posn > 0) {
 772                                 strbuf_addf(&buf, "Range: bytes=%ld-", posn);
 773                                 headers = curl_slist_append(headers, buf.buf);
 774                                 strbuf_reset(&buf);
 775                         }
 776                         slot->local = result;
 777                 } else
 778                         curl_easy_setopt(slot->curl, CURLOPT_WRITEFUNCTION,
 779                                          fwrite_buffer);
 780         }
 781
 782         strbuf_addstr(&buf, "Pragma:");
 783         if (options & HTTP_NO_CACHE)
 784                 strbuf_addstr(&buf, " no-cache");
 785
 786         headers = curl_slist_append(headers, buf.buf);
 787
 788         curl_easy_setopt(slot->curl, CURLOPT_URL, url);
 789         curl_easy_setopt(slot->curl, CURLOPT_HTTPHEADER, headers);
 790
 791         if (start_active_slot(slot)) {
 792                 run_active_slot(slot);
 793                 if (results.curl_result == CURLE_OK)
 794                         ret = HTTP_OK;
 795                 else if (missing_target(&results))
 796                         ret = HTTP_MISSING_TARGET;
 797                 else
 798                         ret = HTTP_ERROR;
 799         } else {
 800                 error("Unable to start HTTP request for %s", url);
 801                 ret = HTTP_START_FAILED;
 802         }
 803
 804         slot->local = NULL;
 805         curl_slist_free_all(headers);
 806         strbuf_release(&buf);
 807
 808         return ret;
 809 }
 810
 811 int http_get_strbuf(const char *url, struct strbuf *result, int options)
 812 {
 813         return http_request(url, result, HTTP_REQUEST_STRBUF, options);
 814 }
 815
 816 int http_get_file(const char *url, const char *filename, int options)
 817 {
 818         int ret;
 819         struct strbuf tmpfile = STRBUF_INIT;
 820         FILE *result;
 821
 822         strbuf_addf(&tmpfile, "%s.temp", filename);
 823         result = fopen(tmpfile.buf, "a");
 824         if (! result) {
 825                 error("Unable to open local file %s", tmpfile.buf);
 826                 ret = HTTP_ERROR;
 827                 goto cleanup;
 828         }
 829
 830         ret = http_request(url, result, HTTP_REQUEST_FILE, options);
 831         fclose(result);
 832
 833         if ((ret == HTTP_OK) && move_temp_to_file(tmpfile.buf, filename))
 834                 ret = HTTP_ERROR;
 835 cleanup:
 836         strbuf_release(&tmpfile);
 837         return ret;
 838 }
 839
 840 int http_error(const char *url, int ret)
 841 {
 842         /* http_request has already handled HTTP_START_FAILED. */
 843         if (ret != HTTP_START_FAILED)
 844                 error("%s while accessing %s\n", curl_errorstr, url);
 845
 846         return ret;
 847 }
 848
 849 int http_fetch_ref(const char *base, struct ref *ref)
 850 {
 851         char *url;
 852         struct strbuf buffer = STRBUF_INIT;
 853         int ret = -1;
 854
 855         url = quote_ref_url(base, ref->name);
 856         if (http_get_strbuf(url, &buffer, HTTP_NO_CACHE) == HTTP_OK) {
 857                 strbuf_rtrim(&buffer);
 858                 if (buffer.len == 40)
 859                         ret = get_sha1_hex(buffer.buf, ref->old_sha1);
 860                 else if (!prefixcmp(buffer.buf, "ref: ")) {
 861                         ref->symref = xstrdup(buffer.buf + 5);
 862                         ret = 0;
 863                 }
 864         }
 865
 866         strbuf_release(&buffer);
 867         free(url);
 868         return ret;
 869 }
 870
 871 /* Helpers for fetching packs */
 872 static int fetch_pack_index(unsigned char *sha1, const char *base_url)
 873 {
 874         int ret = 0;
 875         char *hex = xstrdup(sha1_to_hex(sha1));
 876         char *filename;
 877         char *url;
 878         struct strbuf buf = STRBUF_INIT;
 879
 880         /* Don't use the index if the pack isn't there */
 881         end_url_with_slash(&buf, base_url);
 882         strbuf_addf(&buf, "objects/pack/pack-%s.pack", hex);
 883         url = strbuf_detach(&buf, 0);
 884
 885         if (http_get_strbuf(url, NULL, 0)) {
 886                 ret = error("Unable to verify pack %s is available",
 887                             hex);
 888                 goto cleanup;
 889         }
 890
 891         if (has_pack_index(sha1)) {
 892                 ret = 0;
 893                 goto cleanup;
 894         }
 895
 896         if (http_is_verbose)
 897                 fprintf(stderr, "Getting index for pack %s\n", hex);
 898
 899         end_url_with_slash(&buf, base_url);
 900         strbuf_addf(&buf, "objects/pack/pack-%s.idx", hex);
 901         url = strbuf_detach(&buf, NULL);
 902
 903         filename = sha1_pack_index_name(sha1);
 904         if (http_get_file(url, filename, 0) != HTTP_OK)
 905                 ret = error("Unable to get pack index %s\n", url);
 906
 907 cleanup:
 908         free(hex);
 909         free(url);
 910         return ret;
 911 }
 912
 913 static int fetch_and_setup_pack_index(struct packed_git **packs_head,
 914         unsigned char *sha1, const char *base_url)
 915 {
 916         struct packed_git *new_pack;
 917
 918         if (fetch_pack_index(sha1, base_url))
 919                 return -1;
 920
 921         new_pack = parse_pack_index(sha1);
 922         if (!new_pack)
 923                 return -1; /* parse_pack_index() already issued error message */
 924         new_pack->next = *packs_head;
 925         *packs_head = new_pack;
 926         return 0;
 927 }
 928
 929 int http_get_info_packs(const char *base_url, struct packed_git **packs_head)
 930 {
 931         int ret = 0, i = 0;
 932         char *url, *data;
 933         struct strbuf buf = STRBUF_INIT;
 934         unsigned char sha1[20];
 935
 936         end_url_with_slash(&buf, base_url);
 937         strbuf_addstr(&buf, "objects/info/packs");
 938         url = strbuf_detach(&buf, NULL);
 939
 940         ret = http_get_strbuf(url, &buf, HTTP_NO_CACHE);
 941         if (ret != HTTP_OK)
 942                 goto cleanup;
 943
 944         data = buf.buf;
 945         while (i < buf.len) {
 946                 switch (data[i]) {
 947                 case 'P':
 948                         i++;
 949                         if (i + 52 <= buf.len &&
 950                             !prefixcmp(data + i, " pack-") &&
 951                             !prefixcmp(data + i + 46, ".pack\n")) {
 952                                 get_sha1_hex(data + i + 6, sha1);
 953                                 fetch_and_setup_pack_index(packs_head, sha1,
 954                                                       base_url);
 955                                 i += 51;
 956                                 break;
 957                         }
 958                 default:
 959                         while (i < buf.len && data[i] != '\n')
 960                                 i++;
 961                 }
 962                 i++;
 963         }
 964
 965 cleanup:
 966         free(url);
 967         return ret;
 968 }
 969
 970 void release_http_pack_request(struct http_pack_request *preq)
 971 {
 972         if (preq->packfile != NULL) {
 973                 fclose(preq->packfile);
 974                 preq->packfile = NULL;
 975                 preq->slot->local = NULL;
 976         }
 977         if (preq->range_header != NULL) {
 978                 curl_slist_free_all(preq->range_header);
 979                 preq->range_header = NULL;
 980         }
 981         preq->slot = NULL;
 982         free(preq->url);
 983 }
 984
 985 int finish_http_pack_request(struct http_pack_request *preq)
 986 {
 987         int ret;
 988         struct packed_git **lst;
 989
 990         preq->target->pack_size = ftell(preq->packfile);
 991
 992         if (preq->packfile != NULL) {
 993                 fclose(preq->packfile);
 994                 preq->packfile = NULL;
 995                 preq->slot->local = NULL;
 996         }
 997
 998         ret = move_temp_to_file(preq->tmpfile, preq->filename);
 999         if (ret)
1000                 return ret;
1001
1002         lst = preq->lst;
1003         while (*lst != preq->target)
1004                 lst = &((*lst)->next);
1005         *lst = (*lst)->next;
1006
1007         if (verify_pack(preq->target))
1008                 return -1;
1009         install_packed_git(preq->target);
1010
1011         return 0;
1012 }
1013
1014 struct http_pack_request *new_http_pack_request(
1015         struct packed_git *target, const char *base_url)
1016 {
1017         char *url;
1018         char *filename;
1019         long prev_posn = 0;
1020         char range[RANGE_HEADER_SIZE];
1021         struct strbuf buf = STRBUF_INIT;
1022         struct http_pack_request *preq;
1023
1024         preq = xmalloc(sizeof(*preq));
1025         preq->target = target;
1026         preq->range_header = NULL;
1027
1028         end_url_with_slash(&buf, base_url);
1029         strbuf_addf(&buf, "objects/pack/pack-%s.pack",
1030                 sha1_to_hex(target->sha1));
1031         url = strbuf_detach(&buf, NULL);
1032         preq->url = xstrdup(url);
1033
1034         filename = sha1_pack_name(target->sha1);
1035         snprintf(preq->filename, sizeof(preq->filename), "%s", filename);
1036         snprintf(preq->tmpfile, sizeof(preq->tmpfile), "%s.temp", filename);
1037         preq->packfile = fopen(preq->tmpfile, "a");
1038         if (!preq->packfile) {
1039                 error("Unable to open local file %s for pack",
1040                       preq->tmpfile);
1041                 goto abort;
1042         }
1043
1044         preq->slot = get_active_slot();
1045         preq->slot->local = preq->packfile;
1046         curl_easy_setopt(preq->slot->curl, CURLOPT_FILE, preq->packfile);
1047         curl_easy_setopt(preq->slot->curl, CURLOPT_WRITEFUNCTION, fwrite);
1048         curl_easy_setopt(preq->slot->curl, CURLOPT_URL, url);
1049         curl_easy_setopt(preq->slot->curl, CURLOPT_HTTPHEADER,
1050                 no_pragma_header);
1051
1052         /*
1053          * If there is data present from a previous transfer attempt,
1054          * resume where it left off
1055          */
1056         prev_posn = ftell(preq->packfile);
1057         if (prev_posn>0) {
1058                 if (http_is_verbose)
1059                         fprintf(stderr,
1060                                 "Resuming fetch of pack %s at byte %ld\n",
1061                                 sha1_to_hex(target->sha1), prev_posn);
1062                 sprintf(range, "Range: bytes=%ld-", prev_posn);
1063                 preq->range_header = curl_slist_append(NULL, range);
1064                 curl_easy_setopt(preq->slot->curl, CURLOPT_HTTPHEADER,
1065                         preq->range_header);
1066         }
1067
1068         return preq;
1069
1070 abort:
1071         free(filename);
1072         return NULL;
1073 }
1074
1075 /* Helpers for fetching objects (loose) */
1076 static size_t fwrite_sha1_file(void *ptr, size_t eltsize, size_t nmemb,
1077                                void *data)
1078 {
1079         unsigned char expn[4096];
1080         size_t size = eltsize * nmemb;
1081         int posn = 0;
1082         struct http_object_request *freq =
1083                 (struct http_object_request *)data;
1084         do {
1085                 ssize_t retval = xwrite(freq->localfile,
1086                                         (char *) ptr + posn, size - posn);
1087                 if (retval < 0)
1088                         return posn;
1089                 posn += retval;
1090         } while (posn < size);
1091
1092         freq->stream.avail_in = size;
1093         freq->stream.next_in = ptr;
1094         do {
1095                 freq->stream.next_out = expn;
1096                 freq->stream.avail_out = sizeof(expn);
1097                 freq->zret = git_inflate(&freq->stream, Z_SYNC_FLUSH);
1098                 git_SHA1_Update(&freq->c, expn,
1099                                 sizeof(expn) - freq->stream.avail_out);
1100         } while (freq->stream.avail_in && freq->zret == Z_OK);
1101         data_received++;
1102         return size;
1103 }
1104
1105 struct http_object_request *new_http_object_request(const char *base_url,
1106         unsigned char *sha1)
1107 {
1108         char *hex = sha1_to_hex(sha1);
1109         char *filename;
1110         char prevfile[PATH_MAX];
1111         char *url;
1112         int prevlocal;
1113         unsigned char prev_buf[PREV_BUF_SIZE];
1114         ssize_t prev_read = 0;
1115         long prev_posn = 0;
1116         char range[RANGE_HEADER_SIZE];
1117         struct curl_slist *range_header = NULL;
1118         struct http_object_request *freq;
1119
1120         freq = xmalloc(sizeof(*freq));
1121         hashcpy(freq->sha1, sha1);
1122         freq->localfile = -1;
1123
1124         filename = sha1_file_name(sha1);
1125         snprintf(freq->filename, sizeof(freq->filename), "%s", filename);
1126         snprintf(freq->tmpfile, sizeof(freq->tmpfile),
1127                  "%s.temp", filename);
1128
1129         snprintf(prevfile, sizeof(prevfile), "%s.prev", filename);
1130         unlink_or_warn(prevfile);
1131         rename(freq->tmpfile, prevfile);
1132         unlink_or_warn(freq->tmpfile);
1133
1134         if (freq->localfile != -1)
1135                 error("fd leakage in start: %d", freq->localfile);
1136         freq->localfile = open(freq->tmpfile,
1137                                O_WRONLY | O_CREAT | O_EXCL, 0666);
1138         /*
1139          * This could have failed due to the "lazy directory creation";
1140          * try to mkdir the last path component.
1141          */
1142         if (freq->localfile < 0 && errno == ENOENT) {
1143                 char *dir = strrchr(freq->tmpfile, '/');
1144                 if (dir) {
1145                         *dir = 0;
1146                         mkdir(freq->tmpfile, 0777);
1147                         *dir = '/';
1148                 }
1149                 freq->localfile = open(freq->tmpfile,
1150                                        O_WRONLY | O_CREAT | O_EXCL, 0666);
1151         }
1152
1153         if (freq->localfile < 0) {
1154                 error("Couldn't create temporary file %s for %s: %s",
1155                       freq->tmpfile, freq->filename, strerror(errno));
1156                 goto abort;
1157         }
1158
1159         memset(&freq->stream, 0, sizeof(freq->stream));
1160
1161         git_inflate_init(&freq->stream);
1162
1163         git_SHA1_Init(&freq->c);
1164
1165         url = get_remote_object_url(base_url, hex, 0);
1166         freq->url = xstrdup(url);
1167
1168         /*
1169          * If a previous temp file is present, process what was already
1170          * fetched.
1171          */
1172         prevlocal = open(prevfile, O_RDONLY);
1173         if (prevlocal != -1) {
1174                 do {
1175                         prev_read = xread(prevlocal, prev_buf, PREV_BUF_SIZE);
1176                         if (prev_read>0) {
1177                                 if (fwrite_sha1_file(prev_buf,
1178                                                      1,
1179                                                      prev_read,
1180                                                      freq) == prev_read) {
1181                                         prev_posn += prev_read;
1182                                 } else {
1183                                         prev_read = -1;
1184                                 }
1185                         }
1186                 } while (prev_read > 0);
1187                 close(prevlocal);
1188         }
1189         unlink_or_warn(prevfile);
1190
1191         /*
1192          * Reset inflate/SHA1 if there was an error reading the previous temp
1193          * file; also rewind to the beginning of the local file.
1194          */
1195         if (prev_read == -1) {
1196                 memset(&freq->stream, 0, sizeof(freq->stream));
1197                 git_inflate_init(&freq->stream);
1198                 git_SHA1_Init(&freq->c);
1199                 if (prev_posn>0) {
1200                         prev_posn = 0;
1201                         lseek(freq->localfile, 0, SEEK_SET);
1202                         ftruncate(freq->localfile, 0);
1203                 }
1204         }
1205
1206         freq->slot = get_active_slot();
1207
1208         curl_easy_setopt(freq->slot->curl, CURLOPT_FILE, freq);
1209         curl_easy_setopt(freq->slot->curl, CURLOPT_WRITEFUNCTION, fwrite_sha1_file);
1210         curl_easy_setopt(freq->slot->curl, CURLOPT_ERRORBUFFER, freq->errorstr);
1211         curl_easy_setopt(freq->slot->curl, CURLOPT_URL, url);
1212         curl_easy_setopt(freq->slot->curl, CURLOPT_HTTPHEADER, no_pragma_header);
1213
1214         /*
1215          * If we have successfully processed data from a previous fetch
1216          * attempt, only fetch the data we don't already have.
1217          */
1218         if (prev_posn>0) {
1219                 if (http_is_verbose)
1220                         fprintf(stderr,
1221                                 "Resuming fetch of object %s at byte %ld\n",
1222                                 hex, prev_posn);
1223                 sprintf(range, "Range: bytes=%ld-", prev_posn);
1224                 range_header = curl_slist_append(range_header, range);
1225                 curl_easy_setopt(freq->slot->curl,
1226                                  CURLOPT_HTTPHEADER, range_header);
1227         }
1228
1229         return freq;
1230
1231         free(url);
1232 abort:
1233         free(filename);
1234         free(freq);
1235         return NULL;
1236 }
1237
1238 void process_http_object_request(struct http_object_request *freq)
1239 {
1240         if (freq->slot == NULL)
1241                 return;
1242         freq->curl_result = freq->slot->curl_result;
1243         freq->http_code = freq->slot->http_code;
1244         freq->slot = NULL;
1245 }
1246
1247 int finish_http_object_request(struct http_object_request *freq)
1248 {
1249         struct stat st;
1250
1251         close(freq->localfile);
1252         freq->localfile = -1;
1253
1254         process_http_object_request(freq);
1255
1256         if (freq->http_code == 416) {
1257                 fprintf(stderr, "Warning: requested range invalid; we may already have all the data.\n");
1258         } else if (freq->curl_result != CURLE_OK) {
1259                 if (stat(freq->tmpfile, &st) == 0)
1260                         if (st.st_size == 0)
1261                                 unlink_or_warn(freq->tmpfile);
1262                 return -1;
1263         }
1264
1265         git_inflate_end(&freq->stream);
1266         git_SHA1_Final(freq->real_sha1, &freq->c);
1267         if (freq->zret != Z_STREAM_END) {
1268                 unlink_or_warn(freq->tmpfile);
1269                 return -1;
1270         }
1271         if (hashcmp(freq->sha1, freq->real_sha1)) {
1272                 unlink_or_warn(freq->tmpfile);
1273                 return -1;
1274         }
1275         freq->rename =
1276                 move_temp_to_file(freq->tmpfile, freq->filename);
1277
1278         return freq->rename;
1279 }
1280
1281 void abort_http_object_request(struct http_object_request *freq)
1282 {
1283         unlink_or_warn(freq->tmpfile);
1284
1285         release_http_object_request(freq);
1286 }
1287
1288 void release_http_object_request(struct http_object_request *freq)
1289 {
1290         if (freq->localfile != -1) {
1291                 close(freq->localfile);
1292                 freq->localfile = -1;
1293         }
1294         if (freq->url != NULL) {
1295                 free(freq->url);
1296                 freq->url = NULL;
1297         }
1298         freq->slot = NULL;
1299 }