Andrew's git / gitweb.git / http.c
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http.con commit manpages: italicize command names in synopses (04c2407)
   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 char *ssl_cert = NULL;
  17#if LIBCURL_VERSION_NUM >= 0x070902
  18static char *ssl_key = NULL;
  19#endif
  20#if LIBCURL_VERSION_NUM >= 0x070908
  21static char *ssl_capath = NULL;
  22#endif
  23static 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 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                        if (!value)
 106                                return config_error_nonbool(var);
 107                        ssl_cert = xstrdup(value);
 108                }
 109                return 0;
 110        }
 111#if LIBCURL_VERSION_NUM >= 0x070902
 112        if (!strcmp("http.sslkey", var)) {
 113                if (ssl_key == NULL) {
 114                        if (!value)
 115                                return config_error_nonbool(var);
 116                        ssl_key = xstrdup(value);
 117                }
 118                return 0;
 119        }
 120#endif
 121#if LIBCURL_VERSION_NUM >= 0x070908
 122        if (!strcmp("http.sslcapath", var)) {
 123                if (ssl_capath == NULL) {
 124                        if (!value)
 125                                return config_error_nonbool(var);
 126                        ssl_capath = xstrdup(value);
 127                }
 128                return 0;
 129        }
 130#endif
 131        if (!strcmp("http.sslcainfo", var)) {
 132                if (ssl_cainfo == NULL) {
 133                        if (!value)
 134                                return config_error_nonbool(var);
 135                        ssl_cainfo = xstrdup(value);
 136                }
 137                return 0;
 138        }
 139
 140#ifdef USE_CURL_MULTI
 141        if (!strcmp("http.maxrequests", var)) {
 142                if (max_requests == -1)
 143                        max_requests = git_config_int(var, value);
 144                return 0;
 145        }
 146#endif
 147
 148        if (!strcmp("http.lowspeedlimit", var)) {
 149                if (curl_low_speed_limit == -1)
 150                        curl_low_speed_limit = (long)git_config_int(var, value);
 151                return 0;
 152        }
 153        if (!strcmp("http.lowspeedtime", var)) {
 154                if (curl_low_speed_time == -1)
 155                        curl_low_speed_time = (long)git_config_int(var, value);
 156                return 0;
 157        }
 158
 159        if (!strcmp("http.noepsv", var)) {
 160                curl_ftp_no_epsv = git_config_bool(var, value);
 161                return 0;
 162        }
 163        if (!strcmp("http.proxy", var)) {
 164                if (curl_http_proxy == NULL) {
 165                        if (!value)
 166                                return config_error_nonbool(var);
 167                        curl_http_proxy = xstrdup(value);
 168                }
 169                return 0;
 170        }
 171
 172        /* Fall back on the default ones */
 173        return git_default_config(var, value, cb);
 174}
 175
 176static CURL* get_curl_handle(void)
 177{
 178        CURL* result = curl_easy_init();
 179
 180        curl_easy_setopt(result, CURLOPT_SSL_VERIFYPEER, curl_ssl_verify);
 181#if LIBCURL_VERSION_NUM >= 0x070907
 182        curl_easy_setopt(result, CURLOPT_NETRC, CURL_NETRC_OPTIONAL);
 183#endif
 184
 185        if (ssl_cert != NULL)
 186                curl_easy_setopt(result, CURLOPT_SSLCERT, ssl_cert);
 187#if LIBCURL_VERSION_NUM >= 0x070902
 188        if (ssl_key != NULL)
 189                curl_easy_setopt(result, CURLOPT_SSLKEY, ssl_key);
 190#endif
 191#if LIBCURL_VERSION_NUM >= 0x070908
 192        if (ssl_capath != NULL)
 193                curl_easy_setopt(result, CURLOPT_CAPATH, ssl_capath);
 194#endif
 195        if (ssl_cainfo != NULL)
 196                curl_easy_setopt(result, CURLOPT_CAINFO, ssl_cainfo);
 197        curl_easy_setopt(result, CURLOPT_FAILONERROR, 1);
 198
 199        if (curl_low_speed_limit > 0 && curl_low_speed_time > 0) {
 200                curl_easy_setopt(result, CURLOPT_LOW_SPEED_LIMIT,
 201                                 curl_low_speed_limit);
 202                curl_easy_setopt(result, CURLOPT_LOW_SPEED_TIME,
 203                                 curl_low_speed_time);
 204        }
 205
 206        curl_easy_setopt(result, CURLOPT_FOLLOWLOCATION, 1);
 207
 208        if (getenv("GIT_CURL_VERBOSE"))
 209                curl_easy_setopt(result, CURLOPT_VERBOSE, 1);
 210
 211        curl_easy_setopt(result, CURLOPT_USERAGENT, GIT_USER_AGENT);
 212
 213        if (curl_ftp_no_epsv)
 214                curl_easy_setopt(result, CURLOPT_FTP_USE_EPSV, 0);
 215
 216        if (curl_http_proxy)
 217                curl_easy_setopt(result, CURLOPT_PROXY, curl_http_proxy);
 218
 219        return result;
 220}
 221
 222void http_init(struct remote *remote)
 223{
 224        char *low_speed_limit;
 225        char *low_speed_time;
 226
 227        curl_global_init(CURL_GLOBAL_ALL);
 228
 229        if (remote && remote->http_proxy)
 230                curl_http_proxy = xstrdup(remote->http_proxy);
 231
 232        pragma_header = curl_slist_append(pragma_header, "Pragma: no-cache");
 233
 234#ifdef USE_CURL_MULTI
 235        {
 236                char *http_max_requests = getenv("GIT_HTTP_MAX_REQUESTS");
 237                if (http_max_requests != NULL)
 238                        max_requests = atoi(http_max_requests);
 239        }
 240
 241        curlm = curl_multi_init();
 242        if (curlm == NULL) {
 243                fprintf(stderr, "Error creating curl multi handle.\n");
 244                exit(1);
 245        }
 246#endif
 247
 248        if (getenv("GIT_SSL_NO_VERIFY"))
 249                curl_ssl_verify = 0;
 250
 251        ssl_cert = getenv("GIT_SSL_CERT");
 252#if LIBCURL_VERSION_NUM >= 0x070902
 253        ssl_key = getenv("GIT_SSL_KEY");
 254#endif
 255#if LIBCURL_VERSION_NUM >= 0x070908
 256        ssl_capath = getenv("GIT_SSL_CAPATH");
 257#endif
 258        ssl_cainfo = getenv("GIT_SSL_CAINFO");
 259
 260        low_speed_limit = getenv("GIT_HTTP_LOW_SPEED_LIMIT");
 261        if (low_speed_limit != NULL)
 262                curl_low_speed_limit = strtol(low_speed_limit, NULL, 10);
 263        low_speed_time = getenv("GIT_HTTP_LOW_SPEED_TIME");
 264        if (low_speed_time != NULL)
 265                curl_low_speed_time = strtol(low_speed_time, NULL, 10);
 266
 267        git_config(http_options, NULL);
 268
 269        if (curl_ssl_verify == -1)
 270                curl_ssl_verify = 1;
 271
 272#ifdef USE_CURL_MULTI
 273        if (max_requests < 1)
 274                max_requests = DEFAULT_MAX_REQUESTS;
 275#endif
 276
 277        if (getenv("GIT_CURL_FTP_NO_EPSV"))
 278                curl_ftp_no_epsv = 1;
 279
 280#ifndef NO_CURL_EASY_DUPHANDLE
 281        curl_default = get_curl_handle();
 282#endif
 283}
 284
 285void http_cleanup(void)
 286{
 287        struct active_request_slot *slot = active_queue_head;
 288
 289        while (slot != NULL) {
 290                struct active_request_slot *next = slot->next;
 291                if (slot->curl != NULL) {
 292#ifdef USE_CURL_MULTI
 293                        curl_multi_remove_handle(curlm, slot->curl);
 294#endif
 295                        curl_easy_cleanup(slot->curl);
 296                }
 297                free(slot);
 298                slot = next;
 299        }
 300        active_queue_head = NULL;
 301
 302#ifndef NO_CURL_EASY_DUPHANDLE
 303        curl_easy_cleanup(curl_default);
 304#endif
 305
 306#ifdef USE_CURL_MULTI
 307        curl_multi_cleanup(curlm);
 308#endif
 309        curl_global_cleanup();
 310
 311        curl_slist_free_all(pragma_header);
 312        pragma_header = NULL;
 313
 314        if (curl_http_proxy) {
 315                free(curl_http_proxy);
 316                curl_http_proxy = NULL;
 317        }
 318}
 319
 320struct active_request_slot *get_active_slot(void)
 321{
 322        struct active_request_slot *slot = active_queue_head;
 323        struct active_request_slot *newslot;
 324
 325#ifdef USE_CURL_MULTI
 326        int num_transfers;
 327
 328        /* Wait for a slot to open up if the queue is full */
 329        while (active_requests >= max_requests) {
 330                curl_multi_perform(curlm, &num_transfers);
 331                if (num_transfers < active_requests) {
 332                        process_curl_messages();
 333                }
 334        }
 335#endif
 336
 337        while (slot != NULL && slot->in_use) {
 338                slot = slot->next;
 339        }
 340        if (slot == NULL) {
 341                newslot = xmalloc(sizeof(*newslot));
 342                newslot->curl = NULL;
 343                newslot->in_use = 0;
 344                newslot->next = NULL;
 345
 346                slot = active_queue_head;
 347                if (slot == NULL) {
 348                        active_queue_head = newslot;
 349                } else {
 350                        while (slot->next != NULL) {
 351                                slot = slot->next;
 352                        }
 353                        slot->next = newslot;
 354                }
 355                slot = newslot;
 356        }
 357
 358        if (slot->curl == NULL) {
 359#ifdef NO_CURL_EASY_DUPHANDLE
 360                slot->curl = get_curl_handle();
 361#else
 362                slot->curl = curl_easy_duphandle(curl_default);
 363#endif
 364        }
 365
 366        active_requests++;
 367        slot->in_use = 1;
 368        slot->local = NULL;
 369        slot->results = NULL;
 370        slot->finished = NULL;
 371        slot->callback_data = NULL;
 372        slot->callback_func = NULL;
 373        curl_easy_setopt(slot->curl, CURLOPT_HTTPHEADER, pragma_header);
 374        curl_easy_setopt(slot->curl, CURLOPT_ERRORBUFFER, curl_errorstr);
 375        curl_easy_setopt(slot->curl, CURLOPT_CUSTOMREQUEST, NULL);
 376        curl_easy_setopt(slot->curl, CURLOPT_READFUNCTION, NULL);
 377        curl_easy_setopt(slot->curl, CURLOPT_WRITEFUNCTION, NULL);
 378        curl_easy_setopt(slot->curl, CURLOPT_UPLOAD, 0);
 379        curl_easy_setopt(slot->curl, CURLOPT_HTTPGET, 1);
 380
 381        return slot;
 382}
 383
 384int start_active_slot(struct active_request_slot *slot)
 385{
 386#ifdef USE_CURL_MULTI
 387        CURLMcode curlm_result = curl_multi_add_handle(curlm, slot->curl);
 388        int num_transfers;
 389
 390        if (curlm_result != CURLM_OK &&
 391            curlm_result != CURLM_CALL_MULTI_PERFORM) {
 392                active_requests--;
 393                slot->in_use = 0;
 394                return 0;
 395        }
 396
 397        /*
 398         * We know there must be something to do, since we just added
 399         * something.
 400         */
 401        curl_multi_perform(curlm, &num_transfers);
 402#endif
 403        return 1;
 404}
 405
 406#ifdef USE_CURL_MULTI
 407struct fill_chain {
 408        void *data;
 409        int (*fill)(void *);
 410        struct fill_chain *next;
 411};
 412
 413static struct fill_chain *fill_cfg = NULL;
 414
 415void add_fill_function(void *data, int (*fill)(void *))
 416{
 417        struct fill_chain *new = malloc(sizeof(*new));
 418        struct fill_chain **linkp = &fill_cfg;
 419        new->data = data;
 420        new->fill = fill;
 421        new->next = NULL;
 422        while (*linkp)
 423                linkp = &(*linkp)->next;
 424        *linkp = new;
 425}
 426
 427void fill_active_slots(void)
 428{
 429        struct active_request_slot *slot = active_queue_head;
 430
 431        while (active_requests < max_requests) {
 432                struct fill_chain *fill;
 433                for (fill = fill_cfg; fill; fill = fill->next)
 434                        if (fill->fill(fill->data))
 435                                break;
 436
 437                if (!fill)
 438                        break;
 439        }
 440
 441        while (slot != NULL) {
 442                if (!slot->in_use && slot->curl != NULL) {
 443                        curl_easy_cleanup(slot->curl);
 444                        slot->curl = NULL;
 445                }
 446                slot = slot->next;
 447        }
 448}
 449
 450void step_active_slots(void)
 451{
 452        int num_transfers;
 453        CURLMcode curlm_result;
 454
 455        do {
 456                curlm_result = curl_multi_perform(curlm, &num_transfers);
 457        } while (curlm_result == CURLM_CALL_MULTI_PERFORM);
 458        if (num_transfers < active_requests) {
 459                process_curl_messages();
 460                fill_active_slots();
 461        }
 462}
 463#endif
 464
 465void run_active_slot(struct active_request_slot *slot)
 466{
 467#ifdef USE_CURL_MULTI
 468        long last_pos = 0;
 469        long current_pos;
 470        fd_set readfds;
 471        fd_set writefds;
 472        fd_set excfds;
 473        int max_fd;
 474        struct timeval select_timeout;
 475        int finished = 0;
 476
 477        slot->finished = &finished;
 478        while (!finished) {
 479                data_received = 0;
 480                step_active_slots();
 481
 482                if (!data_received && slot->local != NULL) {
 483                        current_pos = ftell(slot->local);
 484                        if (current_pos > last_pos)
 485                                data_received++;
 486                        last_pos = current_pos;
 487                }
 488
 489                if (slot->in_use && !data_received) {
 490                        max_fd = 0;
 491                        FD_ZERO(&readfds);
 492                        FD_ZERO(&writefds);
 493                        FD_ZERO(&excfds);
 494                        select_timeout.tv_sec = 0;
 495                        select_timeout.tv_usec = 50000;
 496                        select(max_fd, &readfds, &writefds,
 497                               &excfds, &select_timeout);
 498                }
 499        }
 500#else
 501        while (slot->in_use) {
 502                slot->curl_result = curl_easy_perform(slot->curl);
 503                finish_active_slot(slot);
 504        }
 505#endif
 506}
 507
 508static void closedown_active_slot(struct active_request_slot *slot)
 509{
 510        active_requests--;
 511        slot->in_use = 0;
 512}
 513
 514void release_active_slot(struct active_request_slot *slot)
 515{
 516        closedown_active_slot(slot);
 517        if (slot->curl) {
 518#ifdef USE_CURL_MULTI
 519                curl_multi_remove_handle(curlm, slot->curl);
 520#endif
 521                curl_easy_cleanup(slot->curl);
 522                slot->curl = NULL;
 523        }
 524#ifdef USE_CURL_MULTI
 525        fill_active_slots();
 526#endif
 527}
 528
 529static void finish_active_slot(struct active_request_slot *slot)
 530{
 531        closedown_active_slot(slot);
 532        curl_easy_getinfo(slot->curl, CURLINFO_HTTP_CODE, &slot->http_code);
 533
 534        if (slot->finished != NULL)
 535                (*slot->finished) = 1;
 536
 537        /* Store slot results so they can be read after the slot is reused */
 538        if (slot->results != NULL) {
 539                slot->results->curl_result = slot->curl_result;
 540                slot->results->http_code = slot->http_code;
 541        }
 542
 543        /* Run callback if appropriate */
 544        if (slot->callback_func != NULL) {
 545                slot->callback_func(slot->callback_data);
 546        }
 547}
 548
 549void finish_all_active_slots(void)
 550{
 551        struct active_request_slot *slot = active_queue_head;
 552
 553        while (slot != NULL)
 554                if (slot->in_use) {
 555                        run_active_slot(slot);
 556                        slot = active_queue_head;
 557                } else {
 558                        slot = slot->next;
 559                }
 560}
 561
 562static inline int needs_quote(int ch)
 563{
 564        if (((ch >= 'A') && (ch <= 'Z'))
 565                        || ((ch >= 'a') && (ch <= 'z'))
 566                        || ((ch >= '0') && (ch <= '9'))
 567                        || (ch == '/')
 568                        || (ch == '-')
 569                        || (ch == '.'))
 570                return 0;
 571        return 1;
 572}
 573
 574static inline int hex(int v)
 575{
 576        if (v < 10) return '0' + v;
 577        else return 'A' + v - 10;
 578}
 579
 580static char *quote_ref_url(const char *base, const char *ref)
 581{
 582        const char *cp;
 583        char *dp, *qref;
 584        int len, baselen, ch;
 585
 586        baselen = strlen(base);
 587        len = baselen + 2; /* '/' after base and terminating NUL */
 588        for (cp = ref; (ch = *cp) != 0; cp++, len++)
 589                if (needs_quote(ch))
 590                        len += 2; /* extra two hex plus replacement % */
 591        qref = xmalloc(len);
 592        memcpy(qref, base, baselen);
 593        dp = qref + baselen;
 594        *(dp++) = '/';
 595        for (cp = ref; (ch = *cp) != 0; cp++) {
 596                if (needs_quote(ch)) {
 597                        *dp++ = '%';
 598                        *dp++ = hex((ch >> 4) & 0xF);
 599                        *dp++ = hex(ch & 0xF);
 600                }
 601                else
 602                        *dp++ = ch;
 603        }
 604        *dp = 0;
 605
 606        return qref;
 607}
 608
 609int http_fetch_ref(const char *base, struct ref *ref)
 610{
 611        char *url;
 612        struct strbuf buffer = STRBUF_INIT;
 613        struct active_request_slot *slot;
 614        struct slot_results results;
 615        int ret;
 616
 617        url = quote_ref_url(base, ref->name);
 618        slot = get_active_slot();
 619        slot->results = &results;
 620        curl_easy_setopt(slot->curl, CURLOPT_FILE, &buffer);
 621        curl_easy_setopt(slot->curl, CURLOPT_WRITEFUNCTION, fwrite_buffer);
 622        curl_easy_setopt(slot->curl, CURLOPT_HTTPHEADER, NULL);
 623        curl_easy_setopt(slot->curl, CURLOPT_URL, url);
 624        if (start_active_slot(slot)) {
 625                run_active_slot(slot);
 626                if (results.curl_result == CURLE_OK) {
 627                        strbuf_rtrim(&buffer);
 628                        if (buffer.len == 40)
 629                                ret = get_sha1_hex(buffer.buf, ref->old_sha1);
 630                        else if (!prefixcmp(buffer.buf, "ref: ")) {
 631                                ref->symref = xstrdup(buffer.buf + 5);
 632                                ret = 0;
 633                        } else
 634                                ret = 1;
 635                } else {
 636                        ret = error("Couldn't get %s for %s\n%s",
 637                                    url, ref->name, curl_errorstr);
 638                }
 639        } else {
 640                ret = error("Unable to start request");
 641        }
 642
 643        strbuf_release(&buffer);
 644        free(url);
 645        return ret;
 646}