Andrew's git / gitweb.git / http.c
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http.con commit Make the 'lock file' exists error more informative (bdfd739)
   1#include "http.h"
   2
   3int data_received;
   4int active_requests = 0;
   5
   6#ifdef USE_CURL_MULTI
   7static int max_requests = -1;
   8static CURLM *curlm;
   9#endif
  10#ifndef NO_CURL_EASY_DUPHANDLE
  11static CURL *curl_default;
  12#endif
  13char curl_errorstr[CURL_ERROR_SIZE];
  14
  15static int curl_ssl_verify = -1;
  16static const char *ssl_cert = NULL;
  17#if LIBCURL_VERSION_NUM >= 0x070902
  18static const char *ssl_key = NULL;
  19#endif
  20#if LIBCURL_VERSION_NUM >= 0x070908
  21static const char *ssl_capath = NULL;
  22#endif
  23static const char *ssl_cainfo = NULL;
  24static long curl_low_speed_limit = -1;
  25static long curl_low_speed_time = -1;
  26static int curl_ftp_no_epsv = 0;
  27static const char *curl_http_proxy = NULL;
  28
  29static struct curl_slist *pragma_header;
  30
  31static struct active_request_slot *active_queue_head = NULL;
  32
  33size_t fread_buffer(void *ptr, size_t eltsize, size_t nmemb, void *buffer_)
  34{
  35        size_t size = eltsize * nmemb;
  36        struct buffer *buffer = buffer_;
  37
  38        if (size > buffer->buf.len - buffer->posn)
  39                size = buffer->buf.len - buffer->posn;
  40        memcpy(ptr, buffer->buf.buf + buffer->posn, size);
  41        buffer->posn += size;
  42
  43        return size;
  44}
  45
  46size_t fwrite_buffer(const void *ptr, size_t eltsize, size_t nmemb, void *buffer_)
  47{
  48        size_t size = eltsize * nmemb;
  49        struct strbuf *buffer = buffer_;
  50
  51        strbuf_add(buffer, ptr, size);
  52        data_received++;
  53        return size;
  54}
  55
  56size_t fwrite_null(const void *ptr, size_t eltsize, size_t nmemb, void *strbuf)
  57{
  58        data_received++;
  59        return eltsize * nmemb;
  60}
  61
  62static void finish_active_slot(struct active_request_slot *slot);
  63
  64#ifdef USE_CURL_MULTI
  65static void process_curl_messages(void)
  66{
  67        int num_messages;
  68        struct active_request_slot *slot;
  69        CURLMsg *curl_message = curl_multi_info_read(curlm, &num_messages);
  70
  71        while (curl_message != NULL) {
  72                if (curl_message->msg == CURLMSG_DONE) {
  73                        int curl_result = curl_message->data.result;
  74                        slot = active_queue_head;
  75                        while (slot != NULL &&
  76                               slot->curl != curl_message->easy_handle)
  77                                slot = slot->next;
  78                        if (slot != NULL) {
  79                                curl_multi_remove_handle(curlm, slot->curl);
  80                                slot->curl_result = curl_result;
  81                                finish_active_slot(slot);
  82                        } else {
  83                                fprintf(stderr, "Received DONE message for unknown request!\n");
  84                        }
  85                } else {
  86                        fprintf(stderr, "Unknown CURL message received: %d\n",
  87                                (int)curl_message->msg);
  88                }
  89                curl_message = curl_multi_info_read(curlm, &num_messages);
  90        }
  91}
  92#endif
  93
  94static int http_options(const char *var, const char *value, void *cb)
  95{
  96        if (!strcmp("http.sslverify", var)) {
  97                if (curl_ssl_verify == -1) {
  98                        curl_ssl_verify = git_config_bool(var, value);
  99                }
 100                return 0;
 101        }
 102
 103        if (!strcmp("http.sslcert", var)) {
 104                if (ssl_cert == NULL)
 105                        return git_config_string(&ssl_cert, var, value);
 106                return 0;
 107        }
 108#if LIBCURL_VERSION_NUM >= 0x070902
 109        if (!strcmp("http.sslkey", var)) {
 110                if (ssl_key == NULL)
 111                        return git_config_string(&ssl_key, var, value);
 112                return 0;
 113        }
 114#endif
 115#if LIBCURL_VERSION_NUM >= 0x070908
 116        if (!strcmp("http.sslcapath", var)) {
 117                if (ssl_capath == NULL)
 118                        return git_config_string(&ssl_capath, var, value);
 119                return 0;
 120        }
 121#endif
 122        if (!strcmp("http.sslcainfo", var)) {
 123                if (ssl_cainfo == NULL)
 124                        return git_config_string(&ssl_cainfo, var, value);
 125                return 0;
 126        }
 127
 128#ifdef USE_CURL_MULTI
 129        if (!strcmp("http.maxrequests", var)) {
 130                if (max_requests == -1)
 131                        max_requests = git_config_int(var, value);
 132                return 0;
 133        }
 134#endif
 135
 136        if (!strcmp("http.lowspeedlimit", var)) {
 137                if (curl_low_speed_limit == -1)
 138                        curl_low_speed_limit = (long)git_config_int(var, value);
 139                return 0;
 140        }
 141        if (!strcmp("http.lowspeedtime", var)) {
 142                if (curl_low_speed_time == -1)
 143                        curl_low_speed_time = (long)git_config_int(var, value);
 144                return 0;
 145        }
 146
 147        if (!strcmp("http.noepsv", var)) {
 148                curl_ftp_no_epsv = git_config_bool(var, value);
 149                return 0;
 150        }
 151        if (!strcmp("http.proxy", var)) {
 152                if (curl_http_proxy == NULL)
 153                        return git_config_string(&curl_http_proxy, var, value);
 154                return 0;
 155        }
 156
 157        /* Fall back on the default ones */
 158        return git_default_config(var, value, cb);
 159}
 160
 161static CURL* get_curl_handle(void)
 162{
 163        CURL* result = curl_easy_init();
 164
 165        if (!curl_ssl_verify) {
 166                curl_easy_setopt(result, CURLOPT_SSL_VERIFYPEER, 0);
 167                curl_easy_setopt(result, CURLOPT_SSL_VERIFYHOST, 0);
 168        } else {
 169                /* Verify authenticity of the peer's certificate */
 170                curl_easy_setopt(result, CURLOPT_SSL_VERIFYPEER, 1);
 171                /* The name in the cert must match whom we tried to connect */
 172                curl_easy_setopt(result, CURLOPT_SSL_VERIFYHOST, 2);
 173        }
 174
 175#if LIBCURL_VERSION_NUM >= 0x070907
 176        curl_easy_setopt(result, CURLOPT_NETRC, CURL_NETRC_OPTIONAL);
 177#endif
 178
 179        if (ssl_cert != NULL)
 180                curl_easy_setopt(result, CURLOPT_SSLCERT, ssl_cert);
 181#if LIBCURL_VERSION_NUM >= 0x070902
 182        if (ssl_key != NULL)
 183                curl_easy_setopt(result, CURLOPT_SSLKEY, ssl_key);
 184#endif
 185#if LIBCURL_VERSION_NUM >= 0x070908
 186        if (ssl_capath != NULL)
 187                curl_easy_setopt(result, CURLOPT_CAPATH, ssl_capath);
 188#endif
 189        if (ssl_cainfo != NULL)
 190                curl_easy_setopt(result, CURLOPT_CAINFO, ssl_cainfo);
 191        curl_easy_setopt(result, CURLOPT_FAILONERROR, 1);
 192
 193        if (curl_low_speed_limit > 0 && curl_low_speed_time > 0) {
 194                curl_easy_setopt(result, CURLOPT_LOW_SPEED_LIMIT,
 195                                 curl_low_speed_limit);
 196                curl_easy_setopt(result, CURLOPT_LOW_SPEED_TIME,
 197                                 curl_low_speed_time);
 198        }
 199
 200        curl_easy_setopt(result, CURLOPT_FOLLOWLOCATION, 1);
 201
 202        if (getenv("GIT_CURL_VERBOSE"))
 203                curl_easy_setopt(result, CURLOPT_VERBOSE, 1);
 204
 205        curl_easy_setopt(result, CURLOPT_USERAGENT, GIT_USER_AGENT);
 206
 207        if (curl_ftp_no_epsv)
 208                curl_easy_setopt(result, CURLOPT_FTP_USE_EPSV, 0);
 209
 210        if (curl_http_proxy)
 211                curl_easy_setopt(result, CURLOPT_PROXY, curl_http_proxy);
 212
 213        return result;
 214}
 215
 216void http_init(struct remote *remote)
 217{
 218        char *low_speed_limit;
 219        char *low_speed_time;
 220
 221        curl_global_init(CURL_GLOBAL_ALL);
 222
 223        if (remote && remote->http_proxy)
 224                curl_http_proxy = xstrdup(remote->http_proxy);
 225
 226        pragma_header = curl_slist_append(pragma_header, "Pragma: no-cache");
 227
 228#ifdef USE_CURL_MULTI
 229        {
 230                char *http_max_requests = getenv("GIT_HTTP_MAX_REQUESTS");
 231                if (http_max_requests != NULL)
 232                        max_requests = atoi(http_max_requests);
 233        }
 234
 235        curlm = curl_multi_init();
 236        if (curlm == NULL) {
 237                fprintf(stderr, "Error creating curl multi handle.\n");
 238                exit(1);
 239        }
 240#endif
 241
 242        if (getenv("GIT_SSL_NO_VERIFY"))
 243                curl_ssl_verify = 0;
 244
 245        ssl_cert = getenv("GIT_SSL_CERT");
 246#if LIBCURL_VERSION_NUM >= 0x070902
 247        ssl_key = getenv("GIT_SSL_KEY");
 248#endif
 249#if LIBCURL_VERSION_NUM >= 0x070908
 250        ssl_capath = getenv("GIT_SSL_CAPATH");
 251#endif
 252        ssl_cainfo = getenv("GIT_SSL_CAINFO");
 253
 254        low_speed_limit = getenv("GIT_HTTP_LOW_SPEED_LIMIT");
 255        if (low_speed_limit != NULL)
 256                curl_low_speed_limit = strtol(low_speed_limit, NULL, 10);
 257        low_speed_time = getenv("GIT_HTTP_LOW_SPEED_TIME");
 258        if (low_speed_time != NULL)
 259                curl_low_speed_time = strtol(low_speed_time, NULL, 10);
 260
 261        git_config(http_options, NULL);
 262
 263        if (curl_ssl_verify == -1)
 264                curl_ssl_verify = 1;
 265
 266#ifdef USE_CURL_MULTI
 267        if (max_requests < 1)
 268                max_requests = DEFAULT_MAX_REQUESTS;
 269#endif
 270
 271        if (getenv("GIT_CURL_FTP_NO_EPSV"))
 272                curl_ftp_no_epsv = 1;
 273
 274#ifndef NO_CURL_EASY_DUPHANDLE
 275        curl_default = get_curl_handle();
 276#endif
 277}
 278
 279void http_cleanup(void)
 280{
 281        struct active_request_slot *slot = active_queue_head;
 282
 283        while (slot != NULL) {
 284                struct active_request_slot *next = slot->next;
 285                if (slot->curl != NULL) {
 286#ifdef USE_CURL_MULTI
 287                        curl_multi_remove_handle(curlm, slot->curl);
 288#endif
 289                        curl_easy_cleanup(slot->curl);
 290                }
 291                free(slot);
 292                slot = next;
 293        }
 294        active_queue_head = NULL;
 295
 296#ifndef NO_CURL_EASY_DUPHANDLE
 297        curl_easy_cleanup(curl_default);
 298#endif
 299
 300#ifdef USE_CURL_MULTI
 301        curl_multi_cleanup(curlm);
 302#endif
 303        curl_global_cleanup();
 304
 305        curl_slist_free_all(pragma_header);
 306        pragma_header = NULL;
 307
 308        if (curl_http_proxy) {
 309                free((void *)curl_http_proxy);
 310                curl_http_proxy = NULL;
 311        }
 312}
 313
 314struct active_request_slot *get_active_slot(void)
 315{
 316        struct active_request_slot *slot = active_queue_head;
 317        struct active_request_slot *newslot;
 318
 319#ifdef USE_CURL_MULTI
 320        int num_transfers;
 321
 322        /* Wait for a slot to open up if the queue is full */
 323        while (active_requests >= max_requests) {
 324                curl_multi_perform(curlm, &num_transfers);
 325                if (num_transfers < active_requests) {
 326                        process_curl_messages();
 327                }
 328        }
 329#endif
 330
 331        while (slot != NULL && slot->in_use) {
 332                slot = slot->next;
 333        }
 334        if (slot == NULL) {
 335                newslot = xmalloc(sizeof(*newslot));
 336                newslot->curl = NULL;
 337                newslot->in_use = 0;
 338                newslot->next = NULL;
 339
 340                slot = active_queue_head;
 341                if (slot == NULL) {
 342                        active_queue_head = newslot;
 343                } else {
 344                        while (slot->next != NULL) {
 345                                slot = slot->next;
 346                        }
 347                        slot->next = newslot;
 348                }
 349                slot = newslot;
 350        }
 351
 352        if (slot->curl == NULL) {
 353#ifdef NO_CURL_EASY_DUPHANDLE
 354                slot->curl = get_curl_handle();
 355#else
 356                slot->curl = curl_easy_duphandle(curl_default);
 357#endif
 358        }
 359
 360        active_requests++;
 361        slot->in_use = 1;
 362        slot->local = NULL;
 363        slot->results = NULL;
 364        slot->finished = NULL;
 365        slot->callback_data = NULL;
 366        slot->callback_func = NULL;
 367        curl_easy_setopt(slot->curl, CURLOPT_HTTPHEADER, pragma_header);
 368        curl_easy_setopt(slot->curl, CURLOPT_ERRORBUFFER, curl_errorstr);
 369        curl_easy_setopt(slot->curl, CURLOPT_CUSTOMREQUEST, NULL);
 370        curl_easy_setopt(slot->curl, CURLOPT_READFUNCTION, NULL);
 371        curl_easy_setopt(slot->curl, CURLOPT_WRITEFUNCTION, NULL);
 372        curl_easy_setopt(slot->curl, CURLOPT_UPLOAD, 0);
 373        curl_easy_setopt(slot->curl, CURLOPT_HTTPGET, 1);
 374
 375        return slot;
 376}
 377
 378int start_active_slot(struct active_request_slot *slot)
 379{
 380#ifdef USE_CURL_MULTI
 381        CURLMcode curlm_result = curl_multi_add_handle(curlm, slot->curl);
 382        int num_transfers;
 383
 384        if (curlm_result != CURLM_OK &&
 385            curlm_result != CURLM_CALL_MULTI_PERFORM) {
 386                active_requests--;
 387                slot->in_use = 0;
 388                return 0;
 389        }
 390
 391        /*
 392         * We know there must be something to do, since we just added
 393         * something.
 394         */
 395        curl_multi_perform(curlm, &num_transfers);
 396#endif
 397        return 1;
 398}
 399
 400#ifdef USE_CURL_MULTI
 401struct fill_chain {
 402        void *data;
 403        int (*fill)(void *);
 404        struct fill_chain *next;
 405};
 406
 407static struct fill_chain *fill_cfg = NULL;
 408
 409void add_fill_function(void *data, int (*fill)(void *))
 410{
 411        struct fill_chain *new = xmalloc(sizeof(*new));
 412        struct fill_chain **linkp = &fill_cfg;
 413        new->data = data;
 414        new->fill = fill;
 415        new->next = NULL;
 416        while (*linkp)
 417                linkp = &(*linkp)->next;
 418        *linkp = new;
 419}
 420
 421void fill_active_slots(void)
 422{
 423        struct active_request_slot *slot = active_queue_head;
 424
 425        while (active_requests < max_requests) {
 426                struct fill_chain *fill;
 427                for (fill = fill_cfg; fill; fill = fill->next)
 428                        if (fill->fill(fill->data))
 429                                break;
 430
 431                if (!fill)
 432                        break;
 433        }
 434
 435        while (slot != NULL) {
 436                if (!slot->in_use && slot->curl != NULL) {
 437                        curl_easy_cleanup(slot->curl);
 438                        slot->curl = NULL;
 439                }
 440                slot = slot->next;
 441        }
 442}
 443
 444void step_active_slots(void)
 445{
 446        int num_transfers;
 447        CURLMcode curlm_result;
 448
 449        do {
 450                curlm_result = curl_multi_perform(curlm, &num_transfers);
 451        } while (curlm_result == CURLM_CALL_MULTI_PERFORM);
 452        if (num_transfers < active_requests) {
 453                process_curl_messages();
 454                fill_active_slots();
 455        }
 456}
 457#endif
 458
 459void run_active_slot(struct active_request_slot *slot)
 460{
 461#ifdef USE_CURL_MULTI
 462        long last_pos = 0;
 463        long current_pos;
 464        fd_set readfds;
 465        fd_set writefds;
 466        fd_set excfds;
 467        int max_fd;
 468        struct timeval select_timeout;
 469        int finished = 0;
 470
 471        slot->finished = &finished;
 472        while (!finished) {
 473                data_received = 0;
 474                step_active_slots();
 475
 476                if (!data_received && slot->local != NULL) {
 477                        current_pos = ftell(slot->local);
 478                        if (current_pos > last_pos)
 479                                data_received++;
 480                        last_pos = current_pos;
 481                }
 482
 483                if (slot->in_use && !data_received) {
 484                        max_fd = 0;
 485                        FD_ZERO(&readfds);
 486                        FD_ZERO(&writefds);
 487                        FD_ZERO(&excfds);
 488                        select_timeout.tv_sec = 0;
 489                        select_timeout.tv_usec = 50000;
 490                        select(max_fd, &readfds, &writefds,
 491                               &excfds, &select_timeout);
 492                }
 493        }
 494#else
 495        while (slot->in_use) {
 496                slot->curl_result = curl_easy_perform(slot->curl);
 497                finish_active_slot(slot);
 498        }
 499#endif
 500}
 501
 502static void closedown_active_slot(struct active_request_slot *slot)
 503{
 504        active_requests--;
 505        slot->in_use = 0;
 506}
 507
 508void release_active_slot(struct active_request_slot *slot)
 509{
 510        closedown_active_slot(slot);
 511        if (slot->curl) {
 512#ifdef USE_CURL_MULTI
 513                curl_multi_remove_handle(curlm, slot->curl);
 514#endif
 515                curl_easy_cleanup(slot->curl);
 516                slot->curl = NULL;
 517        }
 518#ifdef USE_CURL_MULTI
 519        fill_active_slots();
 520#endif
 521}
 522
 523static void finish_active_slot(struct active_request_slot *slot)
 524{
 525        closedown_active_slot(slot);
 526        curl_easy_getinfo(slot->curl, CURLINFO_HTTP_CODE, &slot->http_code);
 527
 528        if (slot->finished != NULL)
 529                (*slot->finished) = 1;
 530
 531        /* Store slot results so they can be read after the slot is reused */
 532        if (slot->results != NULL) {
 533                slot->results->curl_result = slot->curl_result;
 534                slot->results->http_code = slot->http_code;
 535        }
 536
 537        /* Run callback if appropriate */
 538        if (slot->callback_func != NULL) {
 539                slot->callback_func(slot->callback_data);
 540        }
 541}
 542
 543void finish_all_active_slots(void)
 544{
 545        struct active_request_slot *slot = active_queue_head;
 546
 547        while (slot != NULL)
 548                if (slot->in_use) {
 549                        run_active_slot(slot);
 550                        slot = active_queue_head;
 551                } else {
 552                        slot = slot->next;
 553                }
 554}
 555
 556static inline int needs_quote(int ch)
 557{
 558        if (((ch >= 'A') && (ch <= 'Z'))
 559                        || ((ch >= 'a') && (ch <= 'z'))
 560                        || ((ch >= '0') && (ch <= '9'))
 561                        || (ch == '/')
 562                        || (ch == '-')
 563                        || (ch == '.'))
 564                return 0;
 565        return 1;
 566}
 567
 568static inline int hex(int v)
 569{
 570        if (v < 10) return '0' + v;
 571        else return 'A' + v - 10;
 572}
 573
 574static char *quote_ref_url(const char *base, const char *ref)
 575{
 576        const char *cp;
 577        char *dp, *qref;
 578        int len, baselen, ch;
 579
 580        baselen = strlen(base);
 581        len = baselen + 2; /* '/' after base and terminating NUL */
 582        for (cp = ref; (ch = *cp) != 0; cp++, len++)
 583                if (needs_quote(ch))
 584                        len += 2; /* extra two hex plus replacement % */
 585        qref = xmalloc(len);
 586        memcpy(qref, base, baselen);
 587        dp = qref + baselen;
 588        *(dp++) = '/';
 589        for (cp = ref; (ch = *cp) != 0; cp++) {
 590                if (needs_quote(ch)) {
 591                        *dp++ = '%';
 592                        *dp++ = hex((ch >> 4) & 0xF);
 593                        *dp++ = hex(ch & 0xF);
 594                }
 595                else
 596                        *dp++ = ch;
 597        }
 598        *dp = 0;
 599
 600        return qref;
 601}
 602
 603int http_fetch_ref(const char *base, struct ref *ref)
 604{
 605        char *url;
 606        struct strbuf buffer = STRBUF_INIT;
 607        struct active_request_slot *slot;
 608        struct slot_results results;
 609        int ret;
 610
 611        url = quote_ref_url(base, ref->name);
 612        slot = get_active_slot();
 613        slot->results = &results;
 614        curl_easy_setopt(slot->curl, CURLOPT_FILE, &buffer);
 615        curl_easy_setopt(slot->curl, CURLOPT_WRITEFUNCTION, fwrite_buffer);
 616        curl_easy_setopt(slot->curl, CURLOPT_HTTPHEADER, NULL);
 617        curl_easy_setopt(slot->curl, CURLOPT_URL, url);
 618        if (start_active_slot(slot)) {
 619                run_active_slot(slot);
 620                if (results.curl_result == CURLE_OK) {
 621                        strbuf_rtrim(&buffer);
 622                        if (buffer.len == 40)
 623                                ret = get_sha1_hex(buffer.buf, ref->old_sha1);
 624                        else if (!prefixcmp(buffer.buf, "ref: ")) {
 625                                ref->symref = xstrdup(buffer.buf + 5);
 626                                ret = 0;
 627                        } else
 628                                ret = 1;
 629                } else {
 630                        ret = error("Couldn't get %s for %s\n%s",
 631                                    url, ref->name, curl_errorstr);
 632                }
 633        } else {
 634                ret = error("Unable to start request");
 635        }
 636
 637        strbuf_release(&buffer);
 638        free(url);
 639        return ret;
 640}