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_POSTFIELDS, NULL);
 498         curl_easy_setopt(slot->curl, CURLOPT_UPLOAD, 0);
 499         curl_easy_setopt(slot->curl, CURLOPT_HTTPGET, 1);
 500
 501         return slot;
 502 }
 503
 504 int start_active_slot(struct active_request_slot *slot)
 505 {
 506 #ifdef USE_CURL_MULTI
 507         CURLMcode curlm_result = curl_multi_add_handle(curlm, slot->curl);
 508         int num_transfers;
 509
 510         if (curlm_result != CURLM_OK &&
 511             curlm_result != CURLM_CALL_MULTI_PERFORM) {
 512                 active_requests--;
 513                 slot->in_use = 0;
 514                 return 0;
 515         }
 516
 517         /*
 518          * We know there must be something to do, since we just added
 519          * something.
 520          */
 521         curl_multi_perform(curlm, &num_transfers);
 522 #endif
 523         return 1;
 524 }
 525
 526 #ifdef USE_CURL_MULTI
 527 struct fill_chain {
 528         void *data;
 529         int (*fill)(void *);
 530         struct fill_chain *next;
 531 };
 532
 533 static struct fill_chain *fill_cfg;
 534
 535 void add_fill_function(void *data, int (*fill)(void *))
 536 {
 537         struct fill_chain *new = xmalloc(sizeof(*new));
 538         struct fill_chain **linkp = &fill_cfg;
 539         new->data = data;
 540         new->fill = fill;
 541         new->next = NULL;
 542         while (*linkp)
 543                 linkp = &(*linkp)->next;
 544         *linkp = new;
 545 }
 546
 547 void fill_active_slots(void)
 548 {
 549         struct active_request_slot *slot = active_queue_head;
 550
 551         while (active_requests < max_requests) {
 552                 struct fill_chain *fill;
 553                 for (fill = fill_cfg; fill; fill = fill->next)
 554                         if (fill->fill(fill->data))
 555                                 break;
 556
 557                 if (!fill)
 558                         break;
 559         }
 560
 561         while (slot != NULL) {
 562                 if (!slot->in_use && slot->curl != NULL) {
 563                         curl_easy_cleanup(slot->curl);
 564                         slot->curl = NULL;
 565                 }
 566                 slot = slot->next;
 567         }
 568 }
 569
 570 void step_active_slots(void)
 571 {
 572         int num_transfers;
 573         CURLMcode curlm_result;
 574
 575         do {
 576                 curlm_result = curl_multi_perform(curlm, &num_transfers);
 577         } while (curlm_result == CURLM_CALL_MULTI_PERFORM);
 578         if (num_transfers < active_requests) {
 579                 process_curl_messages();
 580                 fill_active_slots();
 581         }
 582 }
 583 #endif
 584
 585 void run_active_slot(struct active_request_slot *slot)
 586 {
 587 #ifdef USE_CURL_MULTI
 588         long last_pos = 0;
 589         long current_pos;
 590         fd_set readfds;
 591         fd_set writefds;
 592         fd_set excfds;
 593         int max_fd;
 594         struct timeval select_timeout;
 595         int finished = 0;
 596
 597         slot->finished = &finished;
 598         while (!finished) {
 599                 data_received = 0;
 600                 step_active_slots();
 601
 602                 if (!data_received && slot->local != NULL) {
 603                         current_pos = ftell(slot->local);
 604                         if (current_pos > last_pos)
 605                                 data_received++;
 606                         last_pos = current_pos;
 607                 }
 608
 609                 if (slot->in_use && !data_received) {
 610                         max_fd = 0;
 611                         FD_ZERO(&readfds);
 612                         FD_ZERO(&writefds);
 613                         FD_ZERO(&excfds);
 614                         select_timeout.tv_sec = 0;
 615                         select_timeout.tv_usec = 50000;
 616                         select(max_fd, &readfds, &writefds,
 617                                &excfds, &select_timeout);
 618                 }
 619         }
 620 #else
 621         while (slot->in_use) {
 622                 slot->curl_result = curl_easy_perform(slot->curl);
 623                 finish_active_slot(slot);
 624         }
 625 #endif
 626 }
 627
 628 static void closedown_active_slot(struct active_request_slot *slot)
 629 {
 630         active_requests--;
 631         slot->in_use = 0;
 632 }
 633
 634 void release_active_slot(struct active_request_slot *slot)
 635 {
 636         closedown_active_slot(slot);
 637         if (slot->curl) {
 638 #ifdef USE_CURL_MULTI
 639                 curl_multi_remove_handle(curlm, slot->curl);
 640 #endif
 641                 curl_easy_cleanup(slot->curl);
 642                 slot->curl = NULL;
 643         }
 644 #ifdef USE_CURL_MULTI
 645         fill_active_slots();
 646 #endif
 647 }
 648
 649 void finish_active_slot(struct active_request_slot *slot)
 650 {
 651         closedown_active_slot(slot);
 652         curl_easy_getinfo(slot->curl, CURLINFO_HTTP_CODE, &slot->http_code);
 653
 654         if (slot->finished != NULL)
 655                 (*slot->finished) = 1;
 656
 657         /* Store slot results so they can be read after the slot is reused */
 658         if (slot->results != NULL) {
 659                 slot->results->curl_result = slot->curl_result;
 660                 slot->results->http_code = slot->http_code;
 661         }
 662
 663         /* Run callback if appropriate */
 664         if (slot->callback_func != NULL)
 665                 slot->callback_func(slot->callback_data);
 666 }
 667
 668 void finish_all_active_slots(void)
 669 {
 670         struct active_request_slot *slot = active_queue_head;
 671
 672         while (slot != NULL)
 673                 if (slot->in_use) {
 674                         run_active_slot(slot);
 675                         slot = active_queue_head;
 676                 } else {
 677                         slot = slot->next;
 678                 }
 679 }
 680
 681 /* Helpers for modifying and creating URLs */
 682 static inline int needs_quote(int ch)
 683 {
 684         if (((ch >= 'A') && (ch <= 'Z'))
 685                         || ((ch >= 'a') && (ch <= 'z'))
 686                         || ((ch >= '0') && (ch <= '9'))
 687                         || (ch == '/')
 688                         || (ch == '-')
 689                         || (ch == '.'))
 690                 return 0;
 691         return 1;
 692 }
 693
 694 static inline int hex(int v)
 695 {
 696         if (v < 10)
 697                 return '0' + v;
 698         else
 699                 return 'A' + v - 10;
 700 }
 701
 702 static void end_url_with_slash(struct strbuf *buf, const char *url)
 703 {
 704         strbuf_addstr(buf, url);
 705         if (buf->len && buf->buf[buf->len - 1] != '/')
 706                 strbuf_addstr(buf, "/");
 707 }
 708
 709 static char *quote_ref_url(const char *base, const char *ref)
 710 {
 711         struct strbuf buf = STRBUF_INIT;
 712         const char *cp;
 713         int ch;
 714
 715         end_url_with_slash(&buf, base);
 716
 717         for (cp = ref; (ch = *cp) != 0; cp++)
 718                 if (needs_quote(ch))
 719                         strbuf_addf(&buf, "%%%02x", ch);
 720                 else
 721                         strbuf_addch(&buf, *cp);
 722
 723         return strbuf_detach(&buf, NULL);
 724 }
 725
 726 void append_remote_object_url(struct strbuf *buf, const char *url,
 727                               const char *hex,
 728                               int only_two_digit_prefix)
 729 {
 730         end_url_with_slash(buf, url);
 731
 732         strbuf_addf(buf, "objects/%.*s/", 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 = NULL;
 878         struct strbuf buf = STRBUF_INIT;
 879
 880         if (has_pack_index(sha1)) {
 881                 ret = 0;
 882                 goto cleanup;
 883         }
 884
 885         if (http_is_verbose)
 886                 fprintf(stderr, "Getting index for pack %s\n", hex);
 887
 888         end_url_with_slash(&buf, base_url);
 889         strbuf_addf(&buf, "objects/pack/pack-%s.idx", hex);
 890         url = strbuf_detach(&buf, NULL);
 891
 892         filename = sha1_pack_index_name(sha1);
 893         if (http_get_file(url, filename, 0) != HTTP_OK)
 894                 ret = error("Unable to get pack index %s\n", url);
 895
 896 cleanup:
 897         free(hex);
 898         free(url);
 899         return ret;
 900 }
 901
 902 static int fetch_and_setup_pack_index(struct packed_git **packs_head,
 903         unsigned char *sha1, const char *base_url)
 904 {
 905         struct packed_git *new_pack;
 906
 907         if (fetch_pack_index(sha1, base_url))
 908                 return -1;
 909
 910         new_pack = parse_pack_index(sha1);
 911         if (!new_pack)
 912                 return -1; /* parse_pack_index() already issued error message */
 913         new_pack->next = *packs_head;
 914         *packs_head = new_pack;
 915         return 0;
 916 }
 917
 918 int http_get_info_packs(const char *base_url, struct packed_git **packs_head)
 919 {
 920         int ret = 0, i = 0;
 921         char *url, *data;
 922         struct strbuf buf = STRBUF_INIT;
 923         unsigned char sha1[20];
 924
 925         end_url_with_slash(&buf, base_url);
 926         strbuf_addstr(&buf, "objects/info/packs");
 927         url = strbuf_detach(&buf, NULL);
 928
 929         ret = http_get_strbuf(url, &buf, HTTP_NO_CACHE);
 930         if (ret != HTTP_OK)
 931                 goto cleanup;
 932
 933         data = buf.buf;
 934         while (i < buf.len) {
 935                 switch (data[i]) {
 936                 case 'P':
 937                         i++;
 938                         if (i + 52 <= buf.len &&
 939                             !prefixcmp(data + i, " pack-") &&
 940                             !prefixcmp(data + i + 46, ".pack\n")) {
 941                                 get_sha1_hex(data + i + 6, sha1);
 942                                 fetch_and_setup_pack_index(packs_head, sha1,
 943                                                       base_url);
 944                                 i += 51;
 945                                 break;
 946                         }
 947                 default:
 948                         while (i < buf.len && data[i] != '\n')
 949                                 i++;
 950                 }
 951                 i++;
 952         }
 953
 954 cleanup:
 955         free(url);
 956         return ret;
 957 }
 958
 959 void release_http_pack_request(struct http_pack_request *preq)
 960 {
 961         if (preq->packfile != NULL) {
 962                 fclose(preq->packfile);
 963                 preq->packfile = NULL;
 964                 preq->slot->local = NULL;
 965         }
 966         if (preq->range_header != NULL) {
 967                 curl_slist_free_all(preq->range_header);
 968                 preq->range_header = NULL;
 969         }
 970         preq->slot = NULL;
 971         free(preq->url);
 972 }
 973
 974 int finish_http_pack_request(struct http_pack_request *preq)
 975 {
 976         int ret;
 977         struct packed_git **lst;
 978
 979         preq->target->pack_size = ftell(preq->packfile);
 980
 981         if (preq->packfile != NULL) {
 982                 fclose(preq->packfile);
 983                 preq->packfile = NULL;
 984                 preq->slot->local = NULL;
 985         }
 986
 987         ret = move_temp_to_file(preq->tmpfile, preq->filename);
 988         if (ret)
 989                 return ret;
 990
 991         lst = preq->lst;
 992         while (*lst != preq->target)
 993                 lst = &((*lst)->next);
 994         *lst = (*lst)->next;
 995
 996         if (verify_pack(preq->target))
 997                 return -1;
 998         install_packed_git(preq->target);
 999
1000         return 0;
1001 }
1002
1003 struct http_pack_request *new_http_pack_request(
1004         struct packed_git *target, const char *base_url)
1005 {
1006         char *filename;
1007         long prev_posn = 0;
1008         char range[RANGE_HEADER_SIZE];
1009         struct strbuf buf = STRBUF_INIT;
1010         struct http_pack_request *preq;
1011
1012         preq = xmalloc(sizeof(*preq));
1013         preq->target = target;
1014         preq->range_header = NULL;
1015
1016         end_url_with_slash(&buf, base_url);
1017         strbuf_addf(&buf, "objects/pack/pack-%s.pack",
1018                 sha1_to_hex(target->sha1));
1019         preq->url = strbuf_detach(&buf, NULL);
1020
1021         filename = sha1_pack_name(target->sha1);
1022         snprintf(preq->filename, sizeof(preq->filename), "%s", filename);
1023         snprintf(preq->tmpfile, sizeof(preq->tmpfile), "%s.temp", filename);
1024         preq->packfile = fopen(preq->tmpfile, "a");
1025         if (!preq->packfile) {
1026                 error("Unable to open local file %s for pack",
1027                       preq->tmpfile);
1028                 goto abort;
1029         }
1030
1031         preq->slot = get_active_slot();
1032         preq->slot->local = preq->packfile;
1033         curl_easy_setopt(preq->slot->curl, CURLOPT_FILE, preq->packfile);
1034         curl_easy_setopt(preq->slot->curl, CURLOPT_WRITEFUNCTION, fwrite);
1035         curl_easy_setopt(preq->slot->curl, CURLOPT_URL, preq->url);
1036         curl_easy_setopt(preq->slot->curl, CURLOPT_HTTPHEADER,
1037                 no_pragma_header);
1038
1039         /*
1040          * If there is data present from a previous transfer attempt,
1041          * resume where it left off
1042          */
1043         prev_posn = ftell(preq->packfile);
1044         if (prev_posn>0) {
1045                 if (http_is_verbose)
1046                         fprintf(stderr,
1047                                 "Resuming fetch of pack %s at byte %ld\n",
1048                                 sha1_to_hex(target->sha1), prev_posn);
1049                 sprintf(range, "Range: bytes=%ld-", prev_posn);
1050                 preq->range_header = curl_slist_append(NULL, range);
1051                 curl_easy_setopt(preq->slot->curl, CURLOPT_HTTPHEADER,
1052                         preq->range_header);
1053         }
1054
1055         return preq;
1056
1057 abort:
1058         free(filename);
1059         free(preq->url);
1060         free(preq);
1061         return NULL;
1062 }
1063
1064 /* Helpers for fetching objects (loose) */
1065 static size_t fwrite_sha1_file(void *ptr, size_t eltsize, size_t nmemb,
1066                                void *data)
1067 {
1068         unsigned char expn[4096];
1069         size_t size = eltsize * nmemb;
1070         int posn = 0;
1071         struct http_object_request *freq =
1072                 (struct http_object_request *)data;
1073         do {
1074                 ssize_t retval = xwrite(freq->localfile,
1075                                         (char *) ptr + posn, size - posn);
1076                 if (retval < 0)
1077                         return posn;
1078                 posn += retval;
1079         } while (posn < size);
1080
1081         freq->stream.avail_in = size;
1082         freq->stream.next_in = ptr;
1083         do {
1084                 freq->stream.next_out = expn;
1085                 freq->stream.avail_out = sizeof(expn);
1086                 freq->zret = git_inflate(&freq->stream, Z_SYNC_FLUSH);
1087                 git_SHA1_Update(&freq->c, expn,
1088                                 sizeof(expn) - freq->stream.avail_out);
1089         } while (freq->stream.avail_in && freq->zret == Z_OK);
1090         data_received++;
1091         return size;
1092 }
1093
1094 struct http_object_request *new_http_object_request(const char *base_url,
1095         unsigned char *sha1)
1096 {
1097         char *hex = sha1_to_hex(sha1);
1098         char *filename;
1099         char prevfile[PATH_MAX];
1100         int prevlocal;
1101         unsigned char prev_buf[PREV_BUF_SIZE];
1102         ssize_t prev_read = 0;
1103         long prev_posn = 0;
1104         char range[RANGE_HEADER_SIZE];
1105         struct curl_slist *range_header = NULL;
1106         struct http_object_request *freq;
1107
1108         freq = xmalloc(sizeof(*freq));
1109         hashcpy(freq->sha1, sha1);
1110         freq->localfile = -1;
1111
1112         filename = sha1_file_name(sha1);
1113         snprintf(freq->filename, sizeof(freq->filename), "%s", filename);
1114         snprintf(freq->tmpfile, sizeof(freq->tmpfile),
1115                  "%s.temp", filename);
1116
1117         snprintf(prevfile, sizeof(prevfile), "%s.prev", filename);
1118         unlink_or_warn(prevfile);
1119         rename(freq->tmpfile, prevfile);
1120         unlink_or_warn(freq->tmpfile);
1121
1122         if (freq->localfile != -1)
1123                 error("fd leakage in start: %d", freq->localfile);
1124         freq->localfile = open(freq->tmpfile,
1125                                O_WRONLY | O_CREAT | O_EXCL, 0666);
1126         /*
1127          * This could have failed due to the "lazy directory creation";
1128          * try to mkdir the last path component.
1129          */
1130         if (freq->localfile < 0 && errno == ENOENT) {
1131                 char *dir = strrchr(freq->tmpfile, '/');
1132                 if (dir) {
1133                         *dir = 0;
1134                         mkdir(freq->tmpfile, 0777);
1135                         *dir = '/';
1136                 }
1137                 freq->localfile = open(freq->tmpfile,
1138                                        O_WRONLY | O_CREAT | O_EXCL, 0666);
1139         }
1140
1141         if (freq->localfile < 0) {
1142                 error("Couldn't create temporary file %s for %s: %s",
1143                       freq->tmpfile, freq->filename, strerror(errno));
1144                 goto abort;
1145         }
1146
1147         memset(&freq->stream, 0, sizeof(freq->stream));
1148
1149         git_inflate_init(&freq->stream);
1150
1151         git_SHA1_Init(&freq->c);
1152
1153         freq->url = get_remote_object_url(base_url, hex, 0);
1154
1155         /*
1156          * If a previous temp file is present, process what was already
1157          * fetched.
1158          */
1159         prevlocal = open(prevfile, O_RDONLY);
1160         if (prevlocal != -1) {
1161                 do {
1162                         prev_read = xread(prevlocal, prev_buf, PREV_BUF_SIZE);
1163                         if (prev_read>0) {
1164                                 if (fwrite_sha1_file(prev_buf,
1165                                                      1,
1166                                                      prev_read,
1167                                                      freq) == prev_read) {
1168                                         prev_posn += prev_read;
1169                                 } else {
1170                                         prev_read = -1;
1171                                 }
1172                         }
1173                 } while (prev_read > 0);
1174                 close(prevlocal);
1175         }
1176         unlink_or_warn(prevfile);
1177
1178         /*
1179          * Reset inflate/SHA1 if there was an error reading the previous temp
1180          * file; also rewind to the beginning of the local file.
1181          */
1182         if (prev_read == -1) {
1183                 memset(&freq->stream, 0, sizeof(freq->stream));
1184                 git_inflate_init(&freq->stream);
1185                 git_SHA1_Init(&freq->c);
1186                 if (prev_posn>0) {
1187                         prev_posn = 0;
1188                         lseek(freq->localfile, 0, SEEK_SET);
1189                         if (ftruncate(freq->localfile, 0) < 0) {
1190                                 error("Couldn't truncate temporary file %s for %s: %s",
1191                                           freq->tmpfile, freq->filename, strerror(errno));
1192                                 goto abort;
1193                         }
1194                 }
1195         }
1196
1197         freq->slot = get_active_slot();
1198
1199         curl_easy_setopt(freq->slot->curl, CURLOPT_FILE, freq);
1200         curl_easy_setopt(freq->slot->curl, CURLOPT_WRITEFUNCTION, fwrite_sha1_file);
1201         curl_easy_setopt(freq->slot->curl, CURLOPT_ERRORBUFFER, freq->errorstr);
1202         curl_easy_setopt(freq->slot->curl, CURLOPT_URL, freq->url);
1203         curl_easy_setopt(freq->slot->curl, CURLOPT_HTTPHEADER, no_pragma_header);
1204
1205         /*
1206          * If we have successfully processed data from a previous fetch
1207          * attempt, only fetch the data we don't already have.
1208          */
1209         if (prev_posn>0) {
1210                 if (http_is_verbose)
1211                         fprintf(stderr,
1212                                 "Resuming fetch of object %s at byte %ld\n",
1213                                 hex, prev_posn);
1214                 sprintf(range, "Range: bytes=%ld-", prev_posn);
1215                 range_header = curl_slist_append(range_header, range);
1216                 curl_easy_setopt(freq->slot->curl,
1217                                  CURLOPT_HTTPHEADER, range_header);
1218         }
1219
1220         return freq;
1221
1222 abort:
1223         free(filename);
1224         free(freq->url);
1225         free(freq);
1226         return NULL;
1227 }
1228
1229 void process_http_object_request(struct http_object_request *freq)
1230 {
1231         if (freq->slot == NULL)
1232                 return;
1233         freq->curl_result = freq->slot->curl_result;
1234         freq->http_code = freq->slot->http_code;
1235         freq->slot = NULL;
1236 }
1237
1238 int finish_http_object_request(struct http_object_request *freq)
1239 {
1240         struct stat st;
1241
1242         close(freq->localfile);
1243         freq->localfile = -1;
1244
1245         process_http_object_request(freq);
1246
1247         if (freq->http_code == 416) {
1248                 fprintf(stderr, "Warning: requested range invalid; we may already have all the data.\n");
1249         } else if (freq->curl_result != CURLE_OK) {
1250                 if (stat(freq->tmpfile, &st) == 0)
1251                         if (st.st_size == 0)
1252                                 unlink_or_warn(freq->tmpfile);
1253                 return -1;
1254         }
1255
1256         git_inflate_end(&freq->stream);
1257         git_SHA1_Final(freq->real_sha1, &freq->c);
1258         if (freq->zret != Z_STREAM_END) {
1259                 unlink_or_warn(freq->tmpfile);
1260                 return -1;
1261         }
1262         if (hashcmp(freq->sha1, freq->real_sha1)) {
1263                 unlink_or_warn(freq->tmpfile);
1264                 return -1;
1265         }
1266         freq->rename =
1267                 move_temp_to_file(freq->tmpfile, freq->filename);
1268
1269         return freq->rename;
1270 }
1271
1272 void abort_http_object_request(struct http_object_request *freq)
1273 {
1274         unlink_or_warn(freq->tmpfile);
1275
1276         release_http_object_request(freq);
1277 }
1278
1279 void release_http_object_request(struct http_object_request *freq)
1280 {
1281         if (freq->localfile != -1) {
1282                 close(freq->localfile);
1283                 freq->localfile = -1;
1284         }
1285         if (freq->url != NULL) {
1286                 free(freq->url);
1287                 freq->url = NULL;
1288         }
1289         if (freq->slot != NULL) {
1290                 freq->slot->callback_func = NULL;
1291                 freq->slot->callback_data = NULL;
1292                 release_active_slot(freq->slot);
1293                 freq->slot = NULL;
1294         }
1295 }