Andrew's git / gitweb.git / http.c
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http.con commit http.c: style cleanups (4251ccb)
   1#include "http.h"
   2
   3int data_received;
   4int active_requests;
   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;
  17#if LIBCURL_VERSION_NUM >= 0x070902
  18static const char *ssl_key;
  19#endif
  20#if LIBCURL_VERSION_NUM >= 0x070908
  21static const char *ssl_capath;
  22#endif
  23static const char *ssl_cainfo;
  24static long curl_low_speed_limit = -1;
  25static long curl_low_speed_time = -1;
  26static int curl_ftp_no_epsv;
  27static const char *curl_http_proxy;
  28
  29static struct curl_slist *pragma_header;
  30
  31static struct active_request_slot *active_queue_head;
  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                return 0;
 100        }
 101
 102        if (!strcmp("http.sslcert", var)) {
 103                if (ssl_cert == NULL)
 104                        return git_config_string(&ssl_cert, var, value);
 105                return 0;
 106        }
 107#if LIBCURL_VERSION_NUM >= 0x070902
 108        if (!strcmp("http.sslkey", var)) {
 109                if (ssl_key == NULL)
 110                        return git_config_string(&ssl_key, var, value);
 111                return 0;
 112        }
 113#endif
 114#if LIBCURL_VERSION_NUM >= 0x070908
 115        if (!strcmp("http.sslcapath", var)) {
 116                if (ssl_capath == NULL)
 117                        return git_config_string(&ssl_capath, var, value);
 118                return 0;
 119        }
 120#endif
 121        if (!strcmp("http.sslcainfo", var)) {
 122                if (ssl_cainfo == NULL)
 123                        return git_config_string(&ssl_cainfo, var, value);
 124                return 0;
 125        }
 126
 127#ifdef USE_CURL_MULTI
 128        if (!strcmp("http.maxrequests", var)) {
 129                if (max_requests == -1)
 130                        max_requests = git_config_int(var, value);
 131                return 0;
 132        }
 133#endif
 134
 135        if (!strcmp("http.lowspeedlimit", var)) {
 136                if (curl_low_speed_limit == -1)
 137                        curl_low_speed_limit = (long)git_config_int(var, value);
 138                return 0;
 139        }
 140        if (!strcmp("http.lowspeedtime", var)) {
 141                if (curl_low_speed_time == -1)
 142                        curl_low_speed_time = (long)git_config_int(var, value);
 143                return 0;
 144        }
 145
 146        if (!strcmp("http.noepsv", var)) {
 147                curl_ftp_no_epsv = git_config_bool(var, value);
 148                return 0;
 149        }
 150        if (!strcmp("http.proxy", var)) {
 151                if (curl_http_proxy == NULL)
 152                        return git_config_string(&curl_http_proxy, var, value);
 153                return 0;
 154        }
 155
 156        /* Fall back on the default ones */
 157        return git_default_config(var, value, cb);
 158}
 159
 160static CURL *get_curl_handle(void)
 161{
 162        CURL *result = curl_easy_init();
 163
 164        if (!curl_ssl_verify) {
 165                curl_easy_setopt(result, CURLOPT_SSL_VERIFYPEER, 0);
 166                curl_easy_setopt(result, CURLOPT_SSL_VERIFYHOST, 0);
 167        } else {
 168                /* Verify authenticity of the peer's certificate */
 169                curl_easy_setopt(result, CURLOPT_SSL_VERIFYPEER, 1);
 170                /* The name in the cert must match whom we tried to connect */
 171                curl_easy_setopt(result, CURLOPT_SSL_VERIFYHOST, 2);
 172        }
 173
 174#if LIBCURL_VERSION_NUM >= 0x070907
 175        curl_easy_setopt(result, CURLOPT_NETRC, CURL_NETRC_OPTIONAL);
 176#endif
 177
 178        if (ssl_cert != NULL)
 179                curl_easy_setopt(result, CURLOPT_SSLCERT, ssl_cert);
 180#if LIBCURL_VERSION_NUM >= 0x070902
 181        if (ssl_key != NULL)
 182                curl_easy_setopt(result, CURLOPT_SSLKEY, ssl_key);
 183#endif
 184#if LIBCURL_VERSION_NUM >= 0x070908
 185        if (ssl_capath != NULL)
 186                curl_easy_setopt(result, CURLOPT_CAPATH, ssl_capath);
 187#endif
 188        if (ssl_cainfo != NULL)
 189                curl_easy_setopt(result, CURLOPT_CAINFO, ssl_cainfo);
 190        curl_easy_setopt(result, CURLOPT_FAILONERROR, 1);
 191
 192        if (curl_low_speed_limit > 0 && curl_low_speed_time > 0) {
 193                curl_easy_setopt(result, CURLOPT_LOW_SPEED_LIMIT,
 194                                 curl_low_speed_limit);
 195                curl_easy_setopt(result, CURLOPT_LOW_SPEED_TIME,
 196                                 curl_low_speed_time);
 197        }
 198
 199        curl_easy_setopt(result, CURLOPT_FOLLOWLOCATION, 1);
 200
 201        if (getenv("GIT_CURL_VERBOSE"))
 202                curl_easy_setopt(result, CURLOPT_VERBOSE, 1);
 203
 204        curl_easy_setopt(result, CURLOPT_USERAGENT, GIT_USER_AGENT);
 205
 206        if (curl_ftp_no_epsv)
 207                curl_easy_setopt(result, CURLOPT_FTP_USE_EPSV, 0);
 208
 209        if (curl_http_proxy)
 210                curl_easy_setopt(result, CURLOPT_PROXY, curl_http_proxy);
 211
 212        return result;
 213}
 214
 215void http_init(struct remote *remote)
 216{
 217        char *low_speed_limit;
 218        char *low_speed_time;
 219
 220        curl_global_init(CURL_GLOBAL_ALL);
 221
 222        if (remote && remote->http_proxy)
 223                curl_http_proxy = xstrdup(remote->http_proxy);
 224
 225        pragma_header = curl_slist_append(pragma_header, "Pragma: no-cache");
 226
 227#ifdef USE_CURL_MULTI
 228        {
 229                char *http_max_requests = getenv("GIT_HTTP_MAX_REQUESTS");
 230                if (http_max_requests != NULL)
 231                        max_requests = atoi(http_max_requests);
 232        }
 233
 234        curlm = curl_multi_init();
 235        if (curlm == NULL) {
 236                fprintf(stderr, "Error creating curl multi handle.\n");
 237                exit(1);
 238        }
 239#endif
 240
 241        if (getenv("GIT_SSL_NO_VERIFY"))
 242                curl_ssl_verify = 0;
 243
 244        ssl_cert = getenv("GIT_SSL_CERT");
 245#if LIBCURL_VERSION_NUM >= 0x070902
 246        ssl_key = getenv("GIT_SSL_KEY");
 247#endif
 248#if LIBCURL_VERSION_NUM >= 0x070908
 249        ssl_capath = getenv("GIT_SSL_CAPATH");
 250#endif
 251        ssl_cainfo = getenv("GIT_SSL_CAINFO");
 252
 253        low_speed_limit = getenv("GIT_HTTP_LOW_SPEED_LIMIT");
 254        if (low_speed_limit != NULL)
 255                curl_low_speed_limit = strtol(low_speed_limit, NULL, 10);
 256        low_speed_time = getenv("GIT_HTTP_LOW_SPEED_TIME");
 257        if (low_speed_time != NULL)
 258                curl_low_speed_time = strtol(low_speed_time, NULL, 10);
 259
 260        git_config(http_options, NULL);
 261
 262        if (curl_ssl_verify == -1)
 263                curl_ssl_verify = 1;
 264
 265#ifdef USE_CURL_MULTI
 266        if (max_requests < 1)
 267                max_requests = DEFAULT_MAX_REQUESTS;
 268#endif
 269
 270        if (getenv("GIT_CURL_FTP_NO_EPSV"))
 271                curl_ftp_no_epsv = 1;
 272
 273#ifndef NO_CURL_EASY_DUPHANDLE
 274        curl_default = get_curl_handle();
 275#endif
 276}
 277
 278void http_cleanup(void)
 279{
 280        struct active_request_slot *slot = active_queue_head;
 281
 282        while (slot != NULL) {
 283                struct active_request_slot *next = slot->next;
 284                if (slot->curl != NULL) {
 285#ifdef USE_CURL_MULTI
 286                        curl_multi_remove_handle(curlm, slot->curl);
 287#endif
 288                        curl_easy_cleanup(slot->curl);
 289                }
 290                free(slot);
 291                slot = next;
 292        }
 293        active_queue_head = NULL;
 294
 295#ifndef NO_CURL_EASY_DUPHANDLE
 296        curl_easy_cleanup(curl_default);
 297#endif
 298
 299#ifdef USE_CURL_MULTI
 300        curl_multi_cleanup(curlm);
 301#endif
 302        curl_global_cleanup();
 303
 304        curl_slist_free_all(pragma_header);
 305        pragma_header = NULL;
 306
 307        if (curl_http_proxy) {
 308                free((void *)curl_http_proxy);
 309                curl_http_proxy = NULL;
 310        }
 311}
 312
 313struct active_request_slot *get_active_slot(void)
 314{
 315        struct active_request_slot *slot = active_queue_head;
 316        struct active_request_slot *newslot;
 317
 318#ifdef USE_CURL_MULTI
 319        int num_transfers;
 320
 321        /* Wait for a slot to open up if the queue is full */
 322        while (active_requests >= max_requests) {
 323                curl_multi_perform(curlm, &num_transfers);
 324                if (num_transfers < active_requests)
 325                        process_curl_messages();
 326        }
 327#endif
 328
 329        while (slot != NULL && slot->in_use)
 330                slot = slot->next;
 331
 332        if (slot == NULL) {
 333                newslot = xmalloc(sizeof(*newslot));
 334                newslot->curl = NULL;
 335                newslot->in_use = 0;
 336                newslot->next = NULL;
 337
 338                slot = active_queue_head;
 339                if (slot == NULL) {
 340                        active_queue_head = newslot;
 341                } else {
 342                        while (slot->next != NULL)
 343                                slot = slot->next;
 344                        slot->next = newslot;
 345                }
 346                slot = newslot;
 347        }
 348
 349        if (slot->curl == NULL) {
 350#ifdef NO_CURL_EASY_DUPHANDLE
 351                slot->curl = get_curl_handle();
 352#else
 353                slot->curl = curl_easy_duphandle(curl_default);
 354#endif
 355        }
 356
 357        active_requests++;
 358        slot->in_use = 1;
 359        slot->local = NULL;
 360        slot->results = NULL;
 361        slot->finished = NULL;
 362        slot->callback_data = NULL;
 363        slot->callback_func = NULL;
 364        curl_easy_setopt(slot->curl, CURLOPT_HTTPHEADER, pragma_header);
 365        curl_easy_setopt(slot->curl, CURLOPT_ERRORBUFFER, curl_errorstr);
 366        curl_easy_setopt(slot->curl, CURLOPT_CUSTOMREQUEST, NULL);
 367        curl_easy_setopt(slot->curl, CURLOPT_READFUNCTION, NULL);
 368        curl_easy_setopt(slot->curl, CURLOPT_WRITEFUNCTION, NULL);
 369        curl_easy_setopt(slot->curl, CURLOPT_UPLOAD, 0);
 370        curl_easy_setopt(slot->curl, CURLOPT_HTTPGET, 1);
 371
 372        return slot;
 373}
 374
 375int start_active_slot(struct active_request_slot *slot)
 376{
 377#ifdef USE_CURL_MULTI
 378        CURLMcode curlm_result = curl_multi_add_handle(curlm, slot->curl);
 379        int num_transfers;
 380
 381        if (curlm_result != CURLM_OK &&
 382            curlm_result != CURLM_CALL_MULTI_PERFORM) {
 383                active_requests--;
 384                slot->in_use = 0;
 385                return 0;
 386        }
 387
 388        /*
 389         * We know there must be something to do, since we just added
 390         * something.
 391         */
 392        curl_multi_perform(curlm, &num_transfers);
 393#endif
 394        return 1;
 395}
 396
 397#ifdef USE_CURL_MULTI
 398struct fill_chain {
 399        void *data;
 400        int (*fill)(void *);
 401        struct fill_chain *next;
 402};
 403
 404static struct fill_chain *fill_cfg;
 405
 406void add_fill_function(void *data, int (*fill)(void *))
 407{
 408        struct fill_chain *new = xmalloc(sizeof(*new));
 409        struct fill_chain **linkp = &fill_cfg;
 410        new->data = data;
 411        new->fill = fill;
 412        new->next = NULL;
 413        while (*linkp)
 414                linkp = &(*linkp)->next;
 415        *linkp = new;
 416}
 417
 418void fill_active_slots(void)
 419{
 420        struct active_request_slot *slot = active_queue_head;
 421
 422        while (active_requests < max_requests) {
 423                struct fill_chain *fill;
 424                for (fill = fill_cfg; fill; fill = fill->next)
 425                        if (fill->fill(fill->data))
 426                                break;
 427
 428                if (!fill)
 429                        break;
 430        }
 431
 432        while (slot != NULL) {
 433                if (!slot->in_use && slot->curl != NULL) {
 434                        curl_easy_cleanup(slot->curl);
 435                        slot->curl = NULL;
 436                }
 437                slot = slot->next;
 438        }
 439}
 440
 441void step_active_slots(void)
 442{
 443        int num_transfers;
 444        CURLMcode curlm_result;
 445
 446        do {
 447                curlm_result = curl_multi_perform(curlm, &num_transfers);
 448        } while (curlm_result == CURLM_CALL_MULTI_PERFORM);
 449        if (num_transfers < active_requests) {
 450                process_curl_messages();
 451                fill_active_slots();
 452        }
 453}
 454#endif
 455
 456void run_active_slot(struct active_request_slot *slot)
 457{
 458#ifdef USE_CURL_MULTI
 459        long last_pos = 0;
 460        long current_pos;
 461        fd_set readfds;
 462        fd_set writefds;
 463        fd_set excfds;
 464        int max_fd;
 465        struct timeval select_timeout;
 466        int finished = 0;
 467
 468        slot->finished = &finished;
 469        while (!finished) {
 470                data_received = 0;
 471                step_active_slots();
 472
 473                if (!data_received && slot->local != NULL) {
 474                        current_pos = ftell(slot->local);
 475                        if (current_pos > last_pos)
 476                                data_received++;
 477                        last_pos = current_pos;
 478                }
 479
 480                if (slot->in_use && !data_received) {
 481                        max_fd = 0;
 482                        FD_ZERO(&readfds);
 483                        FD_ZERO(&writefds);
 484                        FD_ZERO(&excfds);
 485                        select_timeout.tv_sec = 0;
 486                        select_timeout.tv_usec = 50000;
 487                        select(max_fd, &readfds, &writefds,
 488                               &excfds, &select_timeout);
 489                }
 490        }
 491#else
 492        while (slot->in_use) {
 493                slot->curl_result = curl_easy_perform(slot->curl);
 494                finish_active_slot(slot);
 495        }
 496#endif
 497}
 498
 499static void closedown_active_slot(struct active_request_slot *slot)
 500{
 501        active_requests--;
 502        slot->in_use = 0;
 503}
 504
 505void release_active_slot(struct active_request_slot *slot)
 506{
 507        closedown_active_slot(slot);
 508        if (slot->curl) {
 509#ifdef USE_CURL_MULTI
 510                curl_multi_remove_handle(curlm, slot->curl);
 511#endif
 512                curl_easy_cleanup(slot->curl);
 513                slot->curl = NULL;
 514        }
 515#ifdef USE_CURL_MULTI
 516        fill_active_slots();
 517#endif
 518}
 519
 520static void finish_active_slot(struct active_request_slot *slot)
 521{
 522        closedown_active_slot(slot);
 523        curl_easy_getinfo(slot->curl, CURLINFO_HTTP_CODE, &slot->http_code);
 524
 525        if (slot->finished != NULL)
 526                (*slot->finished) = 1;
 527
 528        /* Store slot results so they can be read after the slot is reused */
 529        if (slot->results != NULL) {
 530                slot->results->curl_result = slot->curl_result;
 531                slot->results->http_code = slot->http_code;
 532        }
 533
 534        /* Run callback if appropriate */
 535        if (slot->callback_func != NULL)
 536                slot->callback_func(slot->callback_data);
 537}
 538
 539void finish_all_active_slots(void)
 540{
 541        struct active_request_slot *slot = active_queue_head;
 542
 543        while (slot != NULL)
 544                if (slot->in_use) {
 545                        run_active_slot(slot);
 546                        slot = active_queue_head;
 547                } else {
 548                        slot = slot->next;
 549                }
 550}
 551
 552static inline int needs_quote(int ch)
 553{
 554        if (((ch >= 'A') && (ch <= 'Z'))
 555                        || ((ch >= 'a') && (ch <= 'z'))
 556                        || ((ch >= '0') && (ch <= '9'))
 557                        || (ch == '/')
 558                        || (ch == '-')
 559                        || (ch == '.'))
 560                return 0;
 561        return 1;
 562}
 563
 564static inline int hex(int v)
 565{
 566        if (v < 10)
 567                return '0' + v;
 568        else
 569                return 'A' + v - 10;
 570}
 571
 572static char *quote_ref_url(const char *base, const char *ref)
 573{
 574        struct strbuf buf = STRBUF_INIT;
 575        const char *cp;
 576        int ch;
 577
 578        strbuf_addstr(&buf, base);
 579        if (buf.len && buf.buf[buf.len - 1] != '/' && *ref != '/')
 580                strbuf_addstr(&buf, "/");
 581
 582        for (cp = ref; (ch = *cp) != 0; cp++)
 583                if (needs_quote(ch))
 584                        strbuf_addf(&buf, "%%%02x", ch);
 585                else
 586                        strbuf_addch(&buf, *cp);
 587
 588        return strbuf_detach(&buf, NULL);
 589}
 590
 591int http_fetch_ref(const char *base, struct ref *ref)
 592{
 593        char *url;
 594        struct strbuf buffer = STRBUF_INIT;
 595        struct active_request_slot *slot;
 596        struct slot_results results;
 597        int ret;
 598
 599        url = quote_ref_url(base, ref->name);
 600        slot = get_active_slot();
 601        slot->results = &results;
 602        curl_easy_setopt(slot->curl, CURLOPT_FILE, &buffer);
 603        curl_easy_setopt(slot->curl, CURLOPT_WRITEFUNCTION, fwrite_buffer);
 604        curl_easy_setopt(slot->curl, CURLOPT_HTTPHEADER, NULL);
 605        curl_easy_setopt(slot->curl, CURLOPT_URL, url);
 606        if (start_active_slot(slot)) {
 607                run_active_slot(slot);
 608                if (results.curl_result == CURLE_OK) {
 609                        strbuf_rtrim(&buffer);
 610                        if (buffer.len == 40)
 611                                ret = get_sha1_hex(buffer.buf, ref->old_sha1);
 612                        else if (!prefixcmp(buffer.buf, "ref: ")) {
 613                                ref->symref = xstrdup(buffer.buf + 5);
 614                                ret = 0;
 615                        } else
 616                                ret = 1;
 617                } else {
 618                        ret = error("Couldn't get %s for %s\n%s",
 619                                    url, ref->name, curl_errorstr);
 620                }
 621        } else {
 622                ret = error("Unable to start request");
 623        }
 624
 625        strbuf_release(&buffer);
 626        free(url);
 627        return ret;
 628}