Andrew's git / gitweb.git / http.c
?
http.con commit Merge branch 'sb/show-ref-parse-options' (ea1b9b9)
   1#include "http.h"
   2#include "pack.h"
   3
   4int data_received;
   5int active_requests;
   6int http_is_verbose;
   7
   8#ifdef USE_CURL_MULTI
   9static int max_requests = -1;
  10static CURLM *curlm;
  11#endif
  12#ifndef NO_CURL_EASY_DUPHANDLE
  13static CURL *curl_default;
  14#endif
  15
  16#define PREV_BUF_SIZE 4096
  17#define RANGE_HEADER_SIZE 30
  18
  19char curl_errorstr[CURL_ERROR_SIZE];
  20
  21static int curl_ssl_verify = -1;
  22static const char *ssl_cert;
  23#if LIBCURL_VERSION_NUM >= 0x070903
  24static const char *ssl_key;
  25#endif
  26#if LIBCURL_VERSION_NUM >= 0x070908
  27static const char *ssl_capath;
  28#endif
  29static const char *ssl_cainfo;
  30static long curl_low_speed_limit = -1;
  31static long curl_low_speed_time = -1;
  32static int curl_ftp_no_epsv;
  33static const char *curl_http_proxy;
  34static char *user_name, *user_pass;
  35
  36static struct curl_slist *pragma_header;
  37static struct curl_slist *no_pragma_header;
  38
  39static struct active_request_slot *active_queue_head;
  40
  41size_t fread_buffer(void *ptr, size_t eltsize, size_t nmemb, void *buffer_)
  42{
  43        size_t size = eltsize * nmemb;
  44        struct buffer *buffer = buffer_;
  45
  46        if (size > buffer->buf.len - buffer->posn)
  47                size = buffer->buf.len - buffer->posn;
  48        memcpy(ptr, buffer->buf.buf + buffer->posn, size);
  49        buffer->posn += size;
  50
  51        return size;
  52}
  53
  54#ifndef NO_CURL_IOCTL
  55curlioerr ioctl_buffer(CURL *handle, int cmd, void *clientp)
  56{
  57        struct buffer *buffer = clientp;
  58
  59        switch (cmd) {
  60        case CURLIOCMD_NOP:
  61                return CURLIOE_OK;
  62
  63        case CURLIOCMD_RESTARTREAD:
  64                buffer->posn = 0;
  65                return CURLIOE_OK;
  66
  67        default:
  68                return CURLIOE_UNKNOWNCMD;
  69        }
  70}
  71#endif
  72
  73size_t fwrite_buffer(const void *ptr, size_t eltsize, size_t nmemb, void *buffer_)
  74{
  75        size_t size = eltsize * nmemb;
  76        struct strbuf *buffer = buffer_;
  77
  78        strbuf_add(buffer, ptr, size);
  79        data_received++;
  80        return size;
  81}
  82
  83size_t fwrite_null(const void *ptr, size_t eltsize, size_t nmemb, void *strbuf)
  84{
  85        data_received++;
  86        return eltsize * nmemb;
  87}
  88
  89static void finish_active_slot(struct active_request_slot *slot);
  90
  91#ifdef USE_CURL_MULTI
  92static void process_curl_messages(void)
  93{
  94        int num_messages;
  95        struct active_request_slot *slot;
  96        CURLMsg *curl_message = curl_multi_info_read(curlm, &num_messages);
  97
  98        while (curl_message != NULL) {
  99                if (curl_message->msg == CURLMSG_DONE) {
 100                        int curl_result = curl_message->data.result;
 101                        slot = active_queue_head;
 102                        while (slot != NULL &&
 103                               slot->curl != curl_message->easy_handle)
 104                                slot = slot->next;
 105                        if (slot != NULL) {
 106                                curl_multi_remove_handle(curlm, slot->curl);
 107                                slot->curl_result = curl_result;
 108                                finish_active_slot(slot);
 109                        } else {
 110                                fprintf(stderr, "Received DONE message for unknown request!\n");
 111                        }
 112                } else {
 113                        fprintf(stderr, "Unknown CURL message received: %d\n",
 114                                (int)curl_message->msg);
 115                }
 116                curl_message = curl_multi_info_read(curlm, &num_messages);
 117        }
 118}
 119#endif
 120
 121static int http_options(const char *var, const char *value, void *cb)
 122{
 123        if (!strcmp("http.sslverify", var)) {
 124                curl_ssl_verify = git_config_bool(var, value);
 125                return 0;
 126        }
 127        if (!strcmp("http.sslcert", var))
 128                return git_config_string(&ssl_cert, var, value);
 129#if LIBCURL_VERSION_NUM >= 0x070903
 130        if (!strcmp("http.sslkey", var))
 131                return git_config_string(&ssl_key, var, value);
 132#endif
 133#if LIBCURL_VERSION_NUM >= 0x070908
 134        if (!strcmp("http.sslcapath", var))
 135                return git_config_string(&ssl_capath, var, value);
 136#endif
 137        if (!strcmp("http.sslcainfo", var))
 138                return git_config_string(&ssl_cainfo, var, value);
 139#ifdef USE_CURL_MULTI
 140        if (!strcmp("http.maxrequests", var)) {
 141                max_requests = git_config_int(var, value);
 142                return 0;
 143        }
 144#endif
 145        if (!strcmp("http.lowspeedlimit", var)) {
 146                curl_low_speed_limit = (long)git_config_int(var, value);
 147                return 0;
 148        }
 149        if (!strcmp("http.lowspeedtime", var)) {
 150                curl_low_speed_time = (long)git_config_int(var, value);
 151                return 0;
 152        }
 153
 154        if (!strcmp("http.noepsv", var)) {
 155                curl_ftp_no_epsv = git_config_bool(var, value);
 156                return 0;
 157        }
 158        if (!strcmp("http.proxy", var))
 159                return git_config_string(&curl_http_proxy, var, value);
 160
 161        /* Fall back on the default ones */
 162        return git_default_config(var, value, cb);
 163}
 164
 165static void init_curl_http_auth(CURL *result)
 166{
 167        if (user_name) {
 168                struct strbuf up = STRBUF_INIT;
 169                if (!user_pass)
 170                        user_pass = xstrdup(getpass("Password: "));
 171                strbuf_addf(&up, "%s:%s", user_name, user_pass);
 172                curl_easy_setopt(result, CURLOPT_USERPWD,
 173                                 strbuf_detach(&up, NULL));
 174        }
 175}
 176
 177static CURL *get_curl_handle(void)
 178{
 179        CURL *result = curl_easy_init();
 180
 181        if (!curl_ssl_verify) {
 182                curl_easy_setopt(result, CURLOPT_SSL_VERIFYPEER, 0);
 183                curl_easy_setopt(result, CURLOPT_SSL_VERIFYHOST, 0);
 184        } else {
 185                /* Verify authenticity of the peer's certificate */
 186                curl_easy_setopt(result, CURLOPT_SSL_VERIFYPEER, 1);
 187                /* The name in the cert must match whom we tried to connect */
 188                curl_easy_setopt(result, CURLOPT_SSL_VERIFYHOST, 2);
 189        }
 190
 191#if LIBCURL_VERSION_NUM >= 0x070907
 192        curl_easy_setopt(result, CURLOPT_NETRC, CURL_NETRC_OPTIONAL);
 193#endif
 194
 195        init_curl_http_auth(result);
 196
 197        if (ssl_cert != NULL)
 198                curl_easy_setopt(result, CURLOPT_SSLCERT, ssl_cert);
 199#if LIBCURL_VERSION_NUM >= 0x070903
 200        if (ssl_key != NULL)
 201                curl_easy_setopt(result, CURLOPT_SSLKEY, ssl_key);
 202#endif
 203#if LIBCURL_VERSION_NUM >= 0x070908
 204        if (ssl_capath != NULL)
 205                curl_easy_setopt(result, CURLOPT_CAPATH, ssl_capath);
 206#endif
 207        if (ssl_cainfo != NULL)
 208                curl_easy_setopt(result, CURLOPT_CAINFO, ssl_cainfo);
 209        curl_easy_setopt(result, CURLOPT_FAILONERROR, 1);
 210
 211        if (curl_low_speed_limit > 0 && curl_low_speed_time > 0) {
 212                curl_easy_setopt(result, CURLOPT_LOW_SPEED_LIMIT,
 213                                 curl_low_speed_limit);
 214                curl_easy_setopt(result, CURLOPT_LOW_SPEED_TIME,
 215                                 curl_low_speed_time);
 216        }
 217
 218        curl_easy_setopt(result, CURLOPT_FOLLOWLOCATION, 1);
 219
 220        if (getenv("GIT_CURL_VERBOSE"))
 221                curl_easy_setopt(result, CURLOPT_VERBOSE, 1);
 222
 223        curl_easy_setopt(result, CURLOPT_USERAGENT, GIT_USER_AGENT);
 224
 225        if (curl_ftp_no_epsv)
 226                curl_easy_setopt(result, CURLOPT_FTP_USE_EPSV, 0);
 227
 228        if (curl_http_proxy)
 229                curl_easy_setopt(result, CURLOPT_PROXY, curl_http_proxy);
 230
 231        return result;
 232}
 233
 234static void http_auth_init(const char *url)
 235{
 236        char *at, *colon, *cp, *slash;
 237        int len;
 238
 239        cp = strstr(url, "://");
 240        if (!cp)
 241                return;
 242
 243        /*
 244         * Ok, the URL looks like "proto://something".  Which one?
 245         * "proto://<user>:<pass>@<host>/...",
 246         * "proto://<user>@<host>/...", or just
 247         * "proto://<host>/..."?
 248         */
 249        cp += 3;
 250        at = strchr(cp, '@');
 251        colon = strchr(cp, ':');
 252        slash = strchrnul(cp, '/');
 253        if (!at || slash <= at)
 254                return; /* No credentials */
 255        if (!colon || at <= colon) {
 256                /* Only username */
 257                len = at - cp;
 258                user_name = xmalloc(len + 1);
 259                memcpy(user_name, cp, len);
 260                user_name[len] = '\0';
 261                user_pass = NULL;
 262        } else {
 263                len = colon - cp;
 264                user_name = xmalloc(len + 1);
 265                memcpy(user_name, cp, len);
 266                user_name[len] = '\0';
 267                len = at - (colon + 1);
 268                user_pass = xmalloc(len + 1);
 269                memcpy(user_pass, colon + 1, len);
 270                user_pass[len] = '\0';
 271        }
 272}
 273
 274static void set_from_env(const char **var, const char *envname)
 275{
 276        const char *val = getenv(envname);
 277        if (val)
 278                *var = val;
 279}
 280
 281void http_init(struct remote *remote)
 282{
 283        char *low_speed_limit;
 284        char *low_speed_time;
 285
 286        http_is_verbose = 0;
 287
 288        git_config(http_options, NULL);
 289
 290        curl_global_init(CURL_GLOBAL_ALL);
 291
 292        if (remote && remote->http_proxy)
 293                curl_http_proxy = xstrdup(remote->http_proxy);
 294
 295        pragma_header = curl_slist_append(pragma_header, "Pragma: no-cache");
 296        no_pragma_header = curl_slist_append(no_pragma_header, "Pragma:");
 297
 298#ifdef USE_CURL_MULTI
 299        {
 300                char *http_max_requests = getenv("GIT_HTTP_MAX_REQUESTS");
 301                if (http_max_requests != NULL)
 302                        max_requests = atoi(http_max_requests);
 303        }
 304
 305        curlm = curl_multi_init();
 306        if (curlm == NULL) {
 307                fprintf(stderr, "Error creating curl multi handle.\n");
 308                exit(1);
 309        }
 310#endif
 311
 312        if (getenv("GIT_SSL_NO_VERIFY"))
 313                curl_ssl_verify = 0;
 314
 315        set_from_env(&ssl_cert, "GIT_SSL_CERT");
 316#if LIBCURL_VERSION_NUM >= 0x070903
 317        set_from_env(&ssl_key, "GIT_SSL_KEY");
 318#endif
 319#if LIBCURL_VERSION_NUM >= 0x070908
 320        set_from_env(&ssl_capath, "GIT_SSL_CAPATH");
 321#endif
 322        set_from_env(&ssl_cainfo, "GIT_SSL_CAINFO");
 323
 324        low_speed_limit = getenv("GIT_HTTP_LOW_SPEED_LIMIT");
 325        if (low_speed_limit != NULL)
 326                curl_low_speed_limit = strtol(low_speed_limit, NULL, 10);
 327        low_speed_time = getenv("GIT_HTTP_LOW_SPEED_TIME");
 328        if (low_speed_time != NULL)
 329                curl_low_speed_time = strtol(low_speed_time, NULL, 10);
 330
 331        if (curl_ssl_verify == -1)
 332                curl_ssl_verify = 1;
 333
 334#ifdef USE_CURL_MULTI
 335        if (max_requests < 1)
 336                max_requests = DEFAULT_MAX_REQUESTS;
 337#endif
 338
 339        if (getenv("GIT_CURL_FTP_NO_EPSV"))
 340                curl_ftp_no_epsv = 1;
 341
 342        if (remote && remote->url && remote->url[0])
 343                http_auth_init(remote->url[0]);
 344
 345#ifndef NO_CURL_EASY_DUPHANDLE
 346        curl_default = get_curl_handle();
 347#endif
 348}
 349
 350void http_cleanup(void)
 351{
 352        struct active_request_slot *slot = active_queue_head;
 353
 354        while (slot != NULL) {
 355                struct active_request_slot *next = slot->next;
 356                if (slot->curl != NULL) {
 357#ifdef USE_CURL_MULTI
 358                        curl_multi_remove_handle(curlm, slot->curl);
 359#endif
 360                        curl_easy_cleanup(slot->curl);
 361                }
 362                free(slot);
 363                slot = next;
 364        }
 365        active_queue_head = NULL;
 366
 367#ifndef NO_CURL_EASY_DUPHANDLE
 368        curl_easy_cleanup(curl_default);
 369#endif
 370
 371#ifdef USE_CURL_MULTI
 372        curl_multi_cleanup(curlm);
 373#endif
 374        curl_global_cleanup();
 375
 376        curl_slist_free_all(pragma_header);
 377        pragma_header = NULL;
 378
 379        curl_slist_free_all(no_pragma_header);
 380        no_pragma_header = NULL;
 381
 382        if (curl_http_proxy) {
 383                free((void *)curl_http_proxy);
 384                curl_http_proxy = NULL;
 385        }
 386}
 387
 388struct active_request_slot *get_active_slot(void)
 389{
 390        struct active_request_slot *slot = active_queue_head;
 391        struct active_request_slot *newslot;
 392
 393#ifdef USE_CURL_MULTI
 394        int num_transfers;
 395
 396        /* Wait for a slot to open up if the queue is full */
 397        while (active_requests >= max_requests) {
 398                curl_multi_perform(curlm, &num_transfers);
 399                if (num_transfers < active_requests)
 400                        process_curl_messages();
 401        }
 402#endif
 403
 404        while (slot != NULL && slot->in_use)
 405                slot = slot->next;
 406
 407        if (slot == NULL) {
 408                newslot = xmalloc(sizeof(*newslot));
 409                newslot->curl = NULL;
 410                newslot->in_use = 0;
 411                newslot->next = NULL;
 412
 413                slot = active_queue_head;
 414                if (slot == NULL) {
 415                        active_queue_head = newslot;
 416                } else {
 417                        while (slot->next != NULL)
 418                                slot = slot->next;
 419                        slot->next = newslot;
 420                }
 421                slot = newslot;
 422        }
 423
 424        if (slot->curl == NULL) {
 425#ifdef NO_CURL_EASY_DUPHANDLE
 426                slot->curl = get_curl_handle();
 427#else
 428                slot->curl = curl_easy_duphandle(curl_default);
 429#endif
 430        }
 431
 432        active_requests++;
 433        slot->in_use = 1;
 434        slot->local = NULL;
 435        slot->results = NULL;
 436        slot->finished = NULL;
 437        slot->callback_data = NULL;
 438        slot->callback_func = NULL;
 439        curl_easy_setopt(slot->curl, CURLOPT_HTTPHEADER, pragma_header);
 440        curl_easy_setopt(slot->curl, CURLOPT_ERRORBUFFER, curl_errorstr);
 441        curl_easy_setopt(slot->curl, CURLOPT_CUSTOMREQUEST, NULL);
 442        curl_easy_setopt(slot->curl, CURLOPT_READFUNCTION, NULL);
 443        curl_easy_setopt(slot->curl, CURLOPT_WRITEFUNCTION, NULL);
 444        curl_easy_setopt(slot->curl, CURLOPT_UPLOAD, 0);
 445        curl_easy_setopt(slot->curl, CURLOPT_HTTPGET, 1);
 446
 447        return slot;
 448}
 449
 450int start_active_slot(struct active_request_slot *slot)
 451{
 452#ifdef USE_CURL_MULTI
 453        CURLMcode curlm_result = curl_multi_add_handle(curlm, slot->curl);
 454        int num_transfers;
 455
 456        if (curlm_result != CURLM_OK &&
 457            curlm_result != CURLM_CALL_MULTI_PERFORM) {
 458                active_requests--;
 459                slot->in_use = 0;
 460                return 0;
 461        }
 462
 463        /*
 464         * We know there must be something to do, since we just added
 465         * something.
 466         */
 467        curl_multi_perform(curlm, &num_transfers);
 468#endif
 469        return 1;
 470}
 471
 472#ifdef USE_CURL_MULTI
 473struct fill_chain {
 474        void *data;
 475        int (*fill)(void *);
 476        struct fill_chain *next;
 477};
 478
 479static struct fill_chain *fill_cfg;
 480
 481void add_fill_function(void *data, int (*fill)(void *))
 482{
 483        struct fill_chain *new = xmalloc(sizeof(*new));
 484        struct fill_chain **linkp = &fill_cfg;
 485        new->data = data;
 486        new->fill = fill;
 487        new->next = NULL;
 488        while (*linkp)
 489                linkp = &(*linkp)->next;
 490        *linkp = new;
 491}
 492
 493void fill_active_slots(void)
 494{
 495        struct active_request_slot *slot = active_queue_head;
 496
 497        while (active_requests < max_requests) {
 498                struct fill_chain *fill;
 499                for (fill = fill_cfg; fill; fill = fill->next)
 500                        if (fill->fill(fill->data))
 501                                break;
 502
 503                if (!fill)
 504                        break;
 505        }
 506
 507        while (slot != NULL) {
 508                if (!slot->in_use && slot->curl != NULL) {
 509                        curl_easy_cleanup(slot->curl);
 510                        slot->curl = NULL;
 511                }
 512                slot = slot->next;
 513        }
 514}
 515
 516void step_active_slots(void)
 517{
 518        int num_transfers;
 519        CURLMcode curlm_result;
 520
 521        do {
 522                curlm_result = curl_multi_perform(curlm, &num_transfers);
 523        } while (curlm_result == CURLM_CALL_MULTI_PERFORM);
 524        if (num_transfers < active_requests) {
 525                process_curl_messages();
 526                fill_active_slots();
 527        }
 528}
 529#endif
 530
 531void run_active_slot(struct active_request_slot *slot)
 532{
 533#ifdef USE_CURL_MULTI
 534        long last_pos = 0;
 535        long current_pos;
 536        fd_set readfds;
 537        fd_set writefds;
 538        fd_set excfds;
 539        int max_fd;
 540        struct timeval select_timeout;
 541        int finished = 0;
 542
 543        slot->finished = &finished;
 544        while (!finished) {
 545                data_received = 0;
 546                step_active_slots();
 547
 548                if (!data_received && slot->local != NULL) {
 549                        current_pos = ftell(slot->local);
 550                        if (current_pos > last_pos)
 551                                data_received++;
 552                        last_pos = current_pos;
 553                }
 554
 555                if (slot->in_use && !data_received) {
 556                        max_fd = 0;
 557                        FD_ZERO(&readfds);
 558                        FD_ZERO(&writefds);
 559                        FD_ZERO(&excfds);
 560                        select_timeout.tv_sec = 0;
 561                        select_timeout.tv_usec = 50000;
 562                        select(max_fd, &readfds, &writefds,
 563                               &excfds, &select_timeout);
 564                }
 565        }
 566#else
 567        while (slot->in_use) {
 568                slot->curl_result = curl_easy_perform(slot->curl);
 569                finish_active_slot(slot);
 570        }
 571#endif
 572}
 573
 574static void closedown_active_slot(struct active_request_slot *slot)
 575{
 576        active_requests--;
 577        slot->in_use = 0;
 578}
 579
 580void release_active_slot(struct active_request_slot *slot)
 581{
 582        closedown_active_slot(slot);
 583        if (slot->curl) {
 584#ifdef USE_CURL_MULTI
 585                curl_multi_remove_handle(curlm, slot->curl);
 586#endif
 587                curl_easy_cleanup(slot->curl);
 588                slot->curl = NULL;
 589        }
 590#ifdef USE_CURL_MULTI
 591        fill_active_slots();
 592#endif
 593}
 594
 595static void finish_active_slot(struct active_request_slot *slot)
 596{
 597        closedown_active_slot(slot);
 598        curl_easy_getinfo(slot->curl, CURLINFO_HTTP_CODE, &slot->http_code);
 599
 600        if (slot->finished != NULL)
 601                (*slot->finished) = 1;
 602
 603        /* Store slot results so they can be read after the slot is reused */
 604        if (slot->results != NULL) {
 605                slot->results->curl_result = slot->curl_result;
 606                slot->results->http_code = slot->http_code;
 607        }
 608
 609        /* Run callback if appropriate */
 610        if (slot->callback_func != NULL)
 611                slot->callback_func(slot->callback_data);
 612}
 613
 614void finish_all_active_slots(void)
 615{
 616        struct active_request_slot *slot = active_queue_head;
 617
 618        while (slot != NULL)
 619                if (slot->in_use) {
 620                        run_active_slot(slot);
 621                        slot = active_queue_head;
 622                } else {
 623                        slot = slot->next;
 624                }
 625}
 626
 627/* Helpers for modifying and creating URLs */
 628static inline int needs_quote(int ch)
 629{
 630        if (((ch >= 'A') && (ch <= 'Z'))
 631                        || ((ch >= 'a') && (ch <= 'z'))
 632                        || ((ch >= '0') && (ch <= '9'))
 633                        || (ch == '/')
 634                        || (ch == '-')
 635                        || (ch == '.'))
 636                return 0;
 637        return 1;
 638}
 639
 640static inline int hex(int v)
 641{
 642        if (v < 10)
 643                return '0' + v;
 644        else
 645                return 'A' + v - 10;
 646}
 647
 648static void end_url_with_slash(struct strbuf *buf, const char *url)
 649{
 650        strbuf_addstr(buf, url);
 651        if (buf->len && buf->buf[buf->len - 1] != '/')
 652                strbuf_addstr(buf, "/");
 653}
 654
 655static char *quote_ref_url(const char *base, const char *ref)
 656{
 657        struct strbuf buf = STRBUF_INIT;
 658        const char *cp;
 659        int ch;
 660
 661        end_url_with_slash(&buf, base);
 662
 663        for (cp = ref; (ch = *cp) != 0; cp++)
 664                if (needs_quote(ch))
 665                        strbuf_addf(&buf, "%%%02x", ch);
 666                else
 667                        strbuf_addch(&buf, *cp);
 668
 669        return strbuf_detach(&buf, NULL);
 670}
 671
 672void append_remote_object_url(struct strbuf *buf, const char *url,
 673                              const char *hex,
 674                              int only_two_digit_prefix)
 675{
 676        strbuf_addf(buf, "%s/objects/%.*s/", url, 2, hex);
 677        if (!only_two_digit_prefix)
 678                strbuf_addf(buf, "%s", hex+2);
 679}
 680
 681char *get_remote_object_url(const char *url, const char *hex,
 682                            int only_two_digit_prefix)
 683{
 684        struct strbuf buf = STRBUF_INIT;
 685        append_remote_object_url(&buf, url, hex, only_two_digit_prefix);
 686        return strbuf_detach(&buf, NULL);
 687}
 688
 689/* http_request() targets */
 690#define HTTP_REQUEST_STRBUF     0
 691#define HTTP_REQUEST_FILE       1
 692
 693static int http_request(const char *url, void *result, int target, int options)
 694{
 695        struct active_request_slot *slot;
 696        struct slot_results results;
 697        struct curl_slist *headers = NULL;
 698        struct strbuf buf = STRBUF_INIT;
 699        int ret;
 700
 701        slot = get_active_slot();
 702        slot->results = &results;
 703        curl_easy_setopt(slot->curl, CURLOPT_HTTPGET, 1);
 704
 705        if (result == NULL) {
 706                curl_easy_setopt(slot->curl, CURLOPT_NOBODY, 1);
 707        } else {
 708                curl_easy_setopt(slot->curl, CURLOPT_NOBODY, 0);
 709                curl_easy_setopt(slot->curl, CURLOPT_FILE, result);
 710
 711                if (target == HTTP_REQUEST_FILE) {
 712                        long posn = ftell(result);
 713                        curl_easy_setopt(slot->curl, CURLOPT_WRITEFUNCTION,
 714                                         fwrite);
 715                        if (posn > 0) {
 716                                strbuf_addf(&buf, "Range: bytes=%ld-", posn);
 717                                headers = curl_slist_append(headers, buf.buf);
 718                                strbuf_reset(&buf);
 719                        }
 720                        slot->local = result;
 721                } else
 722                        curl_easy_setopt(slot->curl, CURLOPT_WRITEFUNCTION,
 723                                         fwrite_buffer);
 724        }
 725
 726        strbuf_addstr(&buf, "Pragma:");
 727        if (options & HTTP_NO_CACHE)
 728                strbuf_addstr(&buf, " no-cache");
 729
 730        headers = curl_slist_append(headers, buf.buf);
 731
 732        curl_easy_setopt(slot->curl, CURLOPT_URL, url);
 733        curl_easy_setopt(slot->curl, CURLOPT_HTTPHEADER, headers);
 734
 735        if (start_active_slot(slot)) {
 736                run_active_slot(slot);
 737                if (results.curl_result == CURLE_OK)
 738                        ret = HTTP_OK;
 739                else if (missing_target(&results))
 740                        ret = HTTP_MISSING_TARGET;
 741                else
 742                        ret = HTTP_ERROR;
 743        } else {
 744                error("Unable to start HTTP request for %s", url);
 745                ret = HTTP_START_FAILED;
 746        }
 747
 748        slot->local = NULL;
 749        curl_slist_free_all(headers);
 750        strbuf_release(&buf);
 751
 752        return ret;
 753}
 754
 755int http_get_strbuf(const char *url, struct strbuf *result, int options)
 756{
 757        return http_request(url, result, HTTP_REQUEST_STRBUF, options);
 758}
 759
 760int http_get_file(const char *url, const char *filename, int options)
 761{
 762        int ret;
 763        struct strbuf tmpfile = STRBUF_INIT;
 764        FILE *result;
 765
 766        strbuf_addf(&tmpfile, "%s.temp", filename);
 767        result = fopen(tmpfile.buf, "a");
 768        if (! result) {
 769                error("Unable to open local file %s", tmpfile.buf);
 770                ret = HTTP_ERROR;
 771                goto cleanup;
 772        }
 773
 774        ret = http_request(url, result, HTTP_REQUEST_FILE, options);
 775        fclose(result);
 776
 777        if ((ret == HTTP_OK) && move_temp_to_file(tmpfile.buf, filename))
 778                ret = HTTP_ERROR;
 779cleanup:
 780        strbuf_release(&tmpfile);
 781        return ret;
 782}
 783
 784int http_error(const char *url, int ret)
 785{
 786        /* http_request has already handled HTTP_START_FAILED. */
 787        if (ret != HTTP_START_FAILED)
 788                error("%s while accessing %s\n", curl_errorstr, url);
 789
 790        return ret;
 791}
 792
 793int http_fetch_ref(const char *base, struct ref *ref)
 794{
 795        char *url;
 796        struct strbuf buffer = STRBUF_INIT;
 797        int ret = -1;
 798
 799        url = quote_ref_url(base, ref->name);
 800        if (http_get_strbuf(url, &buffer, HTTP_NO_CACHE) == HTTP_OK) {
 801                strbuf_rtrim(&buffer);
 802                if (buffer.len == 40)
 803                        ret = get_sha1_hex(buffer.buf, ref->old_sha1);
 804                else if (!prefixcmp(buffer.buf, "ref: ")) {
 805                        ref->symref = xstrdup(buffer.buf + 5);
 806                        ret = 0;
 807                }
 808        }
 809
 810        strbuf_release(&buffer);
 811        free(url);
 812        return ret;
 813}
 814
 815/* Helpers for fetching packs */
 816static int fetch_pack_index(unsigned char *sha1, const char *base_url)
 817{
 818        int ret = 0;
 819        char *hex = xstrdup(sha1_to_hex(sha1));
 820        char *filename;
 821        char *url;
 822        struct strbuf buf = STRBUF_INIT;
 823
 824        /* Don't use the index if the pack isn't there */
 825        end_url_with_slash(&buf, base_url);
 826        strbuf_addf(&buf, "objects/pack/pack-%s.pack", hex);
 827        url = strbuf_detach(&buf, 0);
 828
 829        if (http_get_strbuf(url, NULL, 0)) {
 830                ret = error("Unable to verify pack %s is available",
 831                            hex);
 832                goto cleanup;
 833        }
 834
 835        if (has_pack_index(sha1)) {
 836                ret = 0;
 837                goto cleanup;
 838        }
 839
 840        if (http_is_verbose)
 841                fprintf(stderr, "Getting index for pack %s\n", hex);
 842
 843        end_url_with_slash(&buf, base_url);
 844        strbuf_addf(&buf, "objects/pack/pack-%s.idx", hex);
 845        url = strbuf_detach(&buf, NULL);
 846
 847        filename = sha1_pack_index_name(sha1);
 848        if (http_get_file(url, filename, 0) != HTTP_OK)
 849                ret = error("Unable to get pack index %s\n", url);
 850
 851cleanup:
 852        free(hex);
 853        free(url);
 854        return ret;
 855}
 856
 857static int fetch_and_setup_pack_index(struct packed_git **packs_head,
 858        unsigned char *sha1, const char *base_url)
 859{
 860        struct packed_git *new_pack;
 861
 862        if (fetch_pack_index(sha1, base_url))
 863                return -1;
 864
 865        new_pack = parse_pack_index(sha1);
 866        if (!new_pack)
 867                return -1; /* parse_pack_index() already issued error message */
 868        new_pack->next = *packs_head;
 869        *packs_head = new_pack;
 870        return 0;
 871}
 872
 873int http_get_info_packs(const char *base_url, struct packed_git **packs_head)
 874{
 875        int ret = 0, i = 0;
 876        char *url, *data;
 877        struct strbuf buf = STRBUF_INIT;
 878        unsigned char sha1[20];
 879
 880        end_url_with_slash(&buf, base_url);
 881        strbuf_addstr(&buf, "objects/info/packs");
 882        url = strbuf_detach(&buf, NULL);
 883
 884        ret = http_get_strbuf(url, &buf, HTTP_NO_CACHE);
 885        if (ret != HTTP_OK)
 886                goto cleanup;
 887
 888        data = buf.buf;
 889        while (i < buf.len) {
 890                switch (data[i]) {
 891                case 'P':
 892                        i++;
 893                        if (i + 52 <= buf.len &&
 894                            !prefixcmp(data + i, " pack-") &&
 895                            !prefixcmp(data + i + 46, ".pack\n")) {
 896                                get_sha1_hex(data + i + 6, sha1);
 897                                fetch_and_setup_pack_index(packs_head, sha1,
 898                                                      base_url);
 899                                i += 51;
 900                                break;
 901                        }
 902                default:
 903                        while (i < buf.len && data[i] != '\n')
 904                                i++;
 905                }
 906                i++;
 907        }
 908
 909cleanup:
 910        free(url);
 911        return ret;
 912}
 913
 914void release_http_pack_request(struct http_pack_request *preq)
 915{
 916        if (preq->packfile != NULL) {
 917                fclose(preq->packfile);
 918                preq->packfile = NULL;
 919                preq->slot->local = NULL;
 920        }
 921        if (preq->range_header != NULL) {
 922                curl_slist_free_all(preq->range_header);
 923                preq->range_header = NULL;
 924        }
 925        preq->slot = NULL;
 926        free(preq->url);
 927}
 928
 929int finish_http_pack_request(struct http_pack_request *preq)
 930{
 931        int ret;
 932        struct packed_git **lst;
 933
 934        preq->target->pack_size = ftell(preq->packfile);
 935
 936        if (preq->packfile != NULL) {
 937                fclose(preq->packfile);
 938                preq->packfile = NULL;
 939                preq->slot->local = NULL;
 940        }
 941
 942        ret = move_temp_to_file(preq->tmpfile, preq->filename);
 943        if (ret)
 944                return ret;
 945
 946        lst = preq->lst;
 947        while (*lst != preq->target)
 948                lst = &((*lst)->next);
 949        *lst = (*lst)->next;
 950
 951        if (verify_pack(preq->target))
 952                return -1;
 953        install_packed_git(preq->target);
 954
 955        return 0;
 956}
 957
 958struct http_pack_request *new_http_pack_request(
 959        struct packed_git *target, const char *base_url)
 960{
 961        char *url;
 962        char *filename;
 963        long prev_posn = 0;
 964        char range[RANGE_HEADER_SIZE];
 965        struct strbuf buf = STRBUF_INIT;
 966        struct http_pack_request *preq;
 967
 968        preq = xmalloc(sizeof(*preq));
 969        preq->target = target;
 970        preq->range_header = NULL;
 971
 972        end_url_with_slash(&buf, base_url);
 973        strbuf_addf(&buf, "objects/pack/pack-%s.pack",
 974                sha1_to_hex(target->sha1));
 975        url = strbuf_detach(&buf, NULL);
 976        preq->url = xstrdup(url);
 977
 978        filename = sha1_pack_name(target->sha1);
 979        snprintf(preq->filename, sizeof(preq->filename), "%s", filename);
 980        snprintf(preq->tmpfile, sizeof(preq->tmpfile), "%s.temp", filename);
 981        preq->packfile = fopen(preq->tmpfile, "a");
 982        if (!preq->packfile) {
 983                error("Unable to open local file %s for pack",
 984                      preq->tmpfile);
 985                goto abort;
 986        }
 987
 988        preq->slot = get_active_slot();
 989        preq->slot->local = preq->packfile;
 990        curl_easy_setopt(preq->slot->curl, CURLOPT_FILE, preq->packfile);
 991        curl_easy_setopt(preq->slot->curl, CURLOPT_WRITEFUNCTION, fwrite);
 992        curl_easy_setopt(preq->slot->curl, CURLOPT_URL, url);
 993        curl_easy_setopt(preq->slot->curl, CURLOPT_HTTPHEADER,
 994                no_pragma_header);
 995
 996        /*
 997         * If there is data present from a previous transfer attempt,
 998         * resume where it left off
 999         */
1000        prev_posn = ftell(preq->packfile);
1001        if (prev_posn>0) {
1002                if (http_is_verbose)
1003                        fprintf(stderr,
1004                                "Resuming fetch of pack %s at byte %ld\n",
1005                                sha1_to_hex(target->sha1), prev_posn);
1006                sprintf(range, "Range: bytes=%ld-", prev_posn);
1007                preq->range_header = curl_slist_append(NULL, range);
1008                curl_easy_setopt(preq->slot->curl, CURLOPT_HTTPHEADER,
1009                        preq->range_header);
1010        }
1011
1012        return preq;
1013
1014abort:
1015        free(filename);
1016        return NULL;
1017}
1018
1019/* Helpers for fetching objects (loose) */
1020static size_t fwrite_sha1_file(void *ptr, size_t eltsize, size_t nmemb,
1021                               void *data)
1022{
1023        unsigned char expn[4096];
1024        size_t size = eltsize * nmemb;
1025        int posn = 0;
1026        struct http_object_request *freq =
1027                (struct http_object_request *)data;
1028        do {
1029                ssize_t retval = xwrite(freq->localfile,
1030                                        (char *) ptr + posn, size - posn);
1031                if (retval < 0)
1032                        return posn;
1033                posn += retval;
1034        } while (posn < size);
1035
1036        freq->stream.avail_in = size;
1037        freq->stream.next_in = ptr;
1038        do {
1039                freq->stream.next_out = expn;
1040                freq->stream.avail_out = sizeof(expn);
1041                freq->zret = git_inflate(&freq->stream, Z_SYNC_FLUSH);
1042                git_SHA1_Update(&freq->c, expn,
1043                                sizeof(expn) - freq->stream.avail_out);
1044        } while (freq->stream.avail_in && freq->zret == Z_OK);
1045        data_received++;
1046        return size;
1047}
1048
1049struct http_object_request *new_http_object_request(const char *base_url,
1050        unsigned char *sha1)
1051{
1052        char *hex = sha1_to_hex(sha1);
1053        char *filename;
1054        char prevfile[PATH_MAX];
1055        char *url;
1056        int prevlocal;
1057        unsigned char prev_buf[PREV_BUF_SIZE];
1058        ssize_t prev_read = 0;
1059        long prev_posn = 0;
1060        char range[RANGE_HEADER_SIZE];
1061        struct curl_slist *range_header = NULL;
1062        struct http_object_request *freq;
1063
1064        freq = xmalloc(sizeof(*freq));
1065        hashcpy(freq->sha1, sha1);
1066        freq->localfile = -1;
1067
1068        filename = sha1_file_name(sha1);
1069        snprintf(freq->filename, sizeof(freq->filename), "%s", filename);
1070        snprintf(freq->tmpfile, sizeof(freq->tmpfile),
1071                 "%s.temp", filename);
1072
1073        snprintf(prevfile, sizeof(prevfile), "%s.prev", filename);
1074        unlink_or_warn(prevfile);
1075        rename(freq->tmpfile, prevfile);
1076        unlink_or_warn(freq->tmpfile);
1077
1078        if (freq->localfile != -1)
1079                error("fd leakage in start: %d", freq->localfile);
1080        freq->localfile = open(freq->tmpfile,
1081                               O_WRONLY | O_CREAT | O_EXCL, 0666);
1082        /*
1083         * This could have failed due to the "lazy directory creation";
1084         * try to mkdir the last path component.
1085         */
1086        if (freq->localfile < 0 && errno == ENOENT) {
1087                char *dir = strrchr(freq->tmpfile, '/');
1088                if (dir) {
1089                        *dir = 0;
1090                        mkdir(freq->tmpfile, 0777);
1091                        *dir = '/';
1092                }
1093                freq->localfile = open(freq->tmpfile,
1094                                       O_WRONLY | O_CREAT | O_EXCL, 0666);
1095        }
1096
1097        if (freq->localfile < 0) {
1098                error("Couldn't create temporary file %s for %s: %s",
1099                      freq->tmpfile, freq->filename, strerror(errno));
1100                goto abort;
1101        }
1102
1103        memset(&freq->stream, 0, sizeof(freq->stream));
1104
1105        git_inflate_init(&freq->stream);
1106
1107        git_SHA1_Init(&freq->c);
1108
1109        url = get_remote_object_url(base_url, hex, 0);
1110        freq->url = xstrdup(url);
1111
1112        /*
1113         * If a previous temp file is present, process what was already
1114         * fetched.
1115         */
1116        prevlocal = open(prevfile, O_RDONLY);
1117        if (prevlocal != -1) {
1118                do {
1119                        prev_read = xread(prevlocal, prev_buf, PREV_BUF_SIZE);
1120                        if (prev_read>0) {
1121                                if (fwrite_sha1_file(prev_buf,
1122                                                     1,
1123                                                     prev_read,
1124                                                     freq) == prev_read) {
1125                                        prev_posn += prev_read;
1126                                } else {
1127                                        prev_read = -1;
1128                                }
1129                        }
1130                } while (prev_read > 0);
1131                close(prevlocal);
1132        }
1133        unlink_or_warn(prevfile);
1134
1135        /*
1136         * Reset inflate/SHA1 if there was an error reading the previous temp
1137         * file; also rewind to the beginning of the local file.
1138         */
1139        if (prev_read == -1) {
1140                memset(&freq->stream, 0, sizeof(freq->stream));
1141                git_inflate_init(&freq->stream);
1142                git_SHA1_Init(&freq->c);
1143                if (prev_posn>0) {
1144                        prev_posn = 0;
1145                        lseek(freq->localfile, 0, SEEK_SET);
1146                        ftruncate(freq->localfile, 0);
1147                }
1148        }
1149
1150        freq->slot = get_active_slot();
1151
1152        curl_easy_setopt(freq->slot->curl, CURLOPT_FILE, freq);
1153        curl_easy_setopt(freq->slot->curl, CURLOPT_WRITEFUNCTION, fwrite_sha1_file);
1154        curl_easy_setopt(freq->slot->curl, CURLOPT_ERRORBUFFER, freq->errorstr);
1155        curl_easy_setopt(freq->slot->curl, CURLOPT_URL, url);
1156        curl_easy_setopt(freq->slot->curl, CURLOPT_HTTPHEADER, no_pragma_header);
1157
1158        /*
1159         * If we have successfully processed data from a previous fetch
1160         * attempt, only fetch the data we don't already have.
1161         */
1162        if (prev_posn>0) {
1163                if (http_is_verbose)
1164                        fprintf(stderr,
1165                                "Resuming fetch of object %s at byte %ld\n",
1166                                hex, prev_posn);
1167                sprintf(range, "Range: bytes=%ld-", prev_posn);
1168                range_header = curl_slist_append(range_header, range);
1169                curl_easy_setopt(freq->slot->curl,
1170                                 CURLOPT_HTTPHEADER, range_header);
1171        }
1172
1173        return freq;
1174
1175        free(url);
1176abort:
1177        free(filename);
1178        free(freq);
1179        return NULL;
1180}
1181
1182void process_http_object_request(struct http_object_request *freq)
1183{
1184        if (freq->slot == NULL)
1185                return;
1186        freq->curl_result = freq->slot->curl_result;
1187        freq->http_code = freq->slot->http_code;
1188        freq->slot = NULL;
1189}
1190
1191int finish_http_object_request(struct http_object_request *freq)
1192{
1193        struct stat st;
1194
1195        close(freq->localfile);
1196        freq->localfile = -1;
1197
1198        process_http_object_request(freq);
1199
1200        if (freq->http_code == 416) {
1201                fprintf(stderr, "Warning: requested range invalid; we may already have all the data.\n");
1202        } else if (freq->curl_result != CURLE_OK) {
1203                if (stat(freq->tmpfile, &st) == 0)
1204                        if (st.st_size == 0)
1205                                unlink_or_warn(freq->tmpfile);
1206                return -1;
1207        }
1208
1209        git_inflate_end(&freq->stream);
1210        git_SHA1_Final(freq->real_sha1, &freq->c);
1211        if (freq->zret != Z_STREAM_END) {
1212                unlink_or_warn(freq->tmpfile);
1213                return -1;
1214        }
1215        if (hashcmp(freq->sha1, freq->real_sha1)) {
1216                unlink_or_warn(freq->tmpfile);
1217                return -1;
1218        }
1219        freq->rename =
1220                move_temp_to_file(freq->tmpfile, freq->filename);
1221
1222        return freq->rename;
1223}
1224
1225void abort_http_object_request(struct http_object_request *freq)
1226{
1227        unlink_or_warn(freq->tmpfile);
1228
1229        release_http_object_request(freq);
1230}
1231
1232void release_http_object_request(struct http_object_request *freq)
1233{
1234        if (freq->localfile != -1) {
1235                close(freq->localfile);
1236                freq->localfile = -1;
1237        }
1238        if (freq->url != NULL) {
1239                free(freq->url);
1240                freq->url = NULL;
1241        }
1242        freq->slot = NULL;
1243}