Andrew's git / gitweb.git / http.c
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http.con commit git-cvsserver runs hooks/post-receive (cdf6328)
   1#include "http.h"
   2
   3int data_received;
   4int active_requests = 0;
   5
   6#ifdef USE_CURL_MULTI
   7int max_requests = -1;
   8CURLM *curlm;
   9#endif
  10#ifndef NO_CURL_EASY_DUPHANDLE
  11CURL *curl_default;
  12#endif
  13char curl_errorstr[CURL_ERROR_SIZE];
  14
  15int curl_ssl_verify = -1;
  16char *ssl_cert = NULL;
  17#if LIBCURL_VERSION_NUM >= 0x070902
  18char *ssl_key = NULL;
  19#endif
  20#if LIBCURL_VERSION_NUM >= 0x070908
  21char *ssl_capath = NULL;
  22#endif
  23char *ssl_cainfo = NULL;
  24long curl_low_speed_limit = -1;
  25long curl_low_speed_time = -1;
  26int curl_ftp_no_epsv = 0;
  27char *curl_http_proxy = NULL;
  28
  29struct curl_slist *pragma_header;
  30
  31struct active_request_slot *active_queue_head = NULL;
  32
  33size_t fread_buffer(void *ptr, size_t eltsize, size_t nmemb,
  34                           struct buffer *buffer)
  35{
  36        size_t size = eltsize * nmemb;
  37        if (size > buffer->size - buffer->posn)
  38                size = buffer->size - buffer->posn;
  39        memcpy(ptr, (char *) buffer->buffer + buffer->posn, size);
  40        buffer->posn += size;
  41        return size;
  42}
  43
  44size_t fwrite_buffer(const void *ptr, size_t eltsize,
  45                            size_t nmemb, struct buffer *buffer)
  46{
  47        size_t size = eltsize * nmemb;
  48        if (size > buffer->size - buffer->posn) {
  49                buffer->size = buffer->size * 3 / 2;
  50                if (buffer->size < buffer->posn + size)
  51                        buffer->size = buffer->posn + size;
  52                buffer->buffer = xrealloc(buffer->buffer, buffer->size);
  53        }
  54        memcpy((char *) buffer->buffer + buffer->posn, ptr, size);
  55        buffer->posn += size;
  56        data_received++;
  57        return size;
  58}
  59
  60size_t fwrite_null(const void *ptr, size_t eltsize,
  61                          size_t nmemb, struct buffer *buffer)
  62{
  63        data_received++;
  64        return eltsize * nmemb;
  65}
  66
  67static void finish_active_slot(struct active_request_slot *slot);
  68
  69#ifdef USE_CURL_MULTI
  70static void process_curl_messages(void)
  71{
  72        int num_messages;
  73        struct active_request_slot *slot;
  74        CURLMsg *curl_message = curl_multi_info_read(curlm, &num_messages);
  75
  76        while (curl_message != NULL) {
  77                if (curl_message->msg == CURLMSG_DONE) {
  78                        int curl_result = curl_message->data.result;
  79                        slot = active_queue_head;
  80                        while (slot != NULL &&
  81                               slot->curl != curl_message->easy_handle)
  82                                slot = slot->next;
  83                        if (slot != NULL) {
  84                                curl_multi_remove_handle(curlm, slot->curl);
  85                                slot->curl_result = curl_result;
  86                                finish_active_slot(slot);
  87                        } else {
  88                                fprintf(stderr, "Received DONE message for unknown request!\n");
  89                        }
  90                } else {
  91                        fprintf(stderr, "Unknown CURL message received: %d\n",
  92                                (int)curl_message->msg);
  93                }
  94                curl_message = curl_multi_info_read(curlm, &num_messages);
  95        }
  96}
  97#endif
  98
  99static int http_options(const char *var, const char *value)
 100{
 101        if (!strcmp("http.sslverify", var)) {
 102                if (curl_ssl_verify == -1) {
 103                        curl_ssl_verify = git_config_bool(var, value);
 104                }
 105                return 0;
 106        }
 107
 108        if (!strcmp("http.sslcert", var)) {
 109                if (ssl_cert == NULL) {
 110                        ssl_cert = xmalloc(strlen(value)+1);
 111                        strcpy(ssl_cert, value);
 112                }
 113                return 0;
 114        }
 115#if LIBCURL_VERSION_NUM >= 0x070902
 116        if (!strcmp("http.sslkey", var)) {
 117                if (ssl_key == NULL) {
 118                        ssl_key = xmalloc(strlen(value)+1);
 119                        strcpy(ssl_key, value);
 120                }
 121                return 0;
 122        }
 123#endif
 124#if LIBCURL_VERSION_NUM >= 0x070908
 125        if (!strcmp("http.sslcapath", var)) {
 126                if (ssl_capath == NULL) {
 127                        ssl_capath = xmalloc(strlen(value)+1);
 128                        strcpy(ssl_capath, value);
 129                }
 130                return 0;
 131        }
 132#endif
 133        if (!strcmp("http.sslcainfo", var)) {
 134                if (ssl_cainfo == NULL) {
 135                        ssl_cainfo = xmalloc(strlen(value)+1);
 136                        strcpy(ssl_cainfo, value);
 137                }
 138                return 0;
 139        }
 140
 141#ifdef USE_CURL_MULTI
 142        if (!strcmp("http.maxrequests", var)) {
 143                if (max_requests == -1)
 144                        max_requests = git_config_int(var, value);
 145                return 0;
 146        }
 147#endif
 148
 149        if (!strcmp("http.lowspeedlimit", var)) {
 150                if (curl_low_speed_limit == -1)
 151                        curl_low_speed_limit = (long)git_config_int(var, value);
 152                return 0;
 153        }
 154        if (!strcmp("http.lowspeedtime", var)) {
 155                if (curl_low_speed_time == -1)
 156                        curl_low_speed_time = (long)git_config_int(var, value);
 157                return 0;
 158        }
 159
 160        if (!strcmp("http.noepsv", var)) {
 161                curl_ftp_no_epsv = git_config_bool(var, value);
 162                return 0;
 163        }
 164        if (!strcmp("http.proxy", var)) {
 165                if (curl_http_proxy == NULL) {
 166                        curl_http_proxy = xmalloc(strlen(value)+1);
 167                        strcpy(curl_http_proxy, value);
 168                }
 169                return 0;
 170        }
 171
 172        /* Fall back on the default ones */
 173        return git_default_config(var, value);
 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(void)
 223{
 224        char *low_speed_limit;
 225        char *low_speed_time;
 226
 227        curl_global_init(CURL_GLOBAL_ALL);
 228
 229        pragma_header = curl_slist_append(pragma_header, "Pragma: no-cache");
 230
 231#ifdef USE_CURL_MULTI
 232        {
 233                char *http_max_requests = getenv("GIT_HTTP_MAX_REQUESTS");
 234                if (http_max_requests != NULL)
 235                        max_requests = atoi(http_max_requests);
 236        }
 237
 238        curlm = curl_multi_init();
 239        if (curlm == NULL) {
 240                fprintf(stderr, "Error creating curl multi handle.\n");
 241                exit(1);
 242        }
 243#endif
 244
 245        if (getenv("GIT_SSL_NO_VERIFY"))
 246                curl_ssl_verify = 0;
 247
 248        ssl_cert = getenv("GIT_SSL_CERT");
 249#if LIBCURL_VERSION_NUM >= 0x070902
 250        ssl_key = getenv("GIT_SSL_KEY");
 251#endif
 252#if LIBCURL_VERSION_NUM >= 0x070908
 253        ssl_capath = getenv("GIT_SSL_CAPATH");
 254#endif
 255        ssl_cainfo = getenv("GIT_SSL_CAINFO");
 256
 257        low_speed_limit = getenv("GIT_HTTP_LOW_SPEED_LIMIT");
 258        if (low_speed_limit != NULL)
 259                curl_low_speed_limit = strtol(low_speed_limit, NULL, 10);
 260        low_speed_time = getenv("GIT_HTTP_LOW_SPEED_TIME");
 261        if (low_speed_time != NULL)
 262                curl_low_speed_time = strtol(low_speed_time, NULL, 10);
 263
 264        git_config(http_options);
 265
 266        if (curl_ssl_verify == -1)
 267                curl_ssl_verify = 1;
 268
 269#ifdef USE_CURL_MULTI
 270        if (max_requests < 1)
 271                max_requests = DEFAULT_MAX_REQUESTS;
 272#endif
 273
 274        if (getenv("GIT_CURL_FTP_NO_EPSV"))
 275                curl_ftp_no_epsv = 1;
 276
 277#ifndef NO_CURL_EASY_DUPHANDLE
 278        curl_default = get_curl_handle();
 279#endif
 280}
 281
 282void http_cleanup(void)
 283{
 284        struct active_request_slot *slot = active_queue_head;
 285#ifdef USE_CURL_MULTI
 286        char *wait_url;
 287#endif
 288
 289        while (slot != NULL) {
 290                struct active_request_slot *next = slot->next;
 291#ifdef USE_CURL_MULTI
 292                if (slot->in_use) {
 293                        curl_easy_getinfo(slot->curl,
 294                                          CURLINFO_EFFECTIVE_URL,
 295                                          &wait_url);
 296                        fprintf(stderr, "Waiting for %s\n", wait_url);
 297                        run_active_slot(slot);
 298                }
 299#endif
 300                if (slot->curl != NULL)
 301                        curl_easy_cleanup(slot->curl);
 302                free(slot);
 303                slot = next;
 304        }
 305        active_queue_head = NULL;
 306
 307#ifndef NO_CURL_EASY_DUPHANDLE
 308        curl_easy_cleanup(curl_default);
 309#endif
 310
 311#ifdef USE_CURL_MULTI
 312        curl_multi_cleanup(curlm);
 313#endif
 314        curl_global_cleanup();
 315
 316        curl_slist_free_all(pragma_header);
 317        pragma_header = NULL;
 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, NULL);
 374        curl_easy_setopt(slot->curl, CURLOPT_HTTPHEADER, pragma_header);
 375        curl_easy_setopt(slot->curl, CURLOPT_ERRORBUFFER, curl_errorstr);
 376        curl_easy_setopt(slot->curl, CURLOPT_CUSTOMREQUEST, NULL);
 377        curl_easy_setopt(slot->curl, CURLOPT_READFUNCTION, NULL);
 378        curl_easy_setopt(slot->curl, CURLOPT_WRITEFUNCTION, NULL);
 379        curl_easy_setopt(slot->curl, CURLOPT_UPLOAD, 0);
 380        curl_easy_setopt(slot->curl, CURLOPT_HTTPGET, 1);
 381
 382        return slot;
 383}
 384
 385int start_active_slot(struct active_request_slot *slot)
 386{
 387#ifdef USE_CURL_MULTI
 388        CURLMcode curlm_result = curl_multi_add_handle(curlm, slot->curl);
 389        int num_transfers;
 390
 391        if (curlm_result != CURLM_OK &&
 392            curlm_result != CURLM_CALL_MULTI_PERFORM) {
 393                active_requests--;
 394                slot->in_use = 0;
 395                return 0;
 396        }
 397
 398        /*
 399         * We know there must be something to do, since we just added
 400         * something.
 401         */
 402        curl_multi_perform(curlm, &num_transfers);
 403#endif
 404        return 1;
 405}
 406
 407#ifdef USE_CURL_MULTI
 408struct fill_chain {
 409        void *data;
 410        int (*fill)(void *);
 411        struct fill_chain *next;
 412};
 413
 414static struct fill_chain *fill_cfg = NULL;
 415
 416void add_fill_function(void *data, int (*fill)(void *))
 417{
 418        struct fill_chain *new = malloc(sizeof(*new));
 419        struct fill_chain **linkp = &fill_cfg;
 420        new->data = data;
 421        new->fill = fill;
 422        new->next = NULL;
 423        while (*linkp)
 424                linkp = &(*linkp)->next;
 425        *linkp = new;
 426}
 427
 428void fill_active_slots(void)
 429{
 430        struct active_request_slot *slot = active_queue_head;
 431
 432        while (active_requests < max_requests) {
 433                struct fill_chain *fill;
 434                for (fill = fill_cfg; fill; fill = fill->next)
 435                        if (fill->fill(fill->data))
 436                                break;
 437
 438                if (!fill)
 439                        break;
 440        }
 441
 442        while (slot != NULL) {
 443                if (!slot->in_use && slot->curl != NULL) {
 444                        curl_easy_cleanup(slot->curl);
 445                        slot->curl = NULL;
 446                }
 447                slot = slot->next;
 448        }
 449}
 450
 451void step_active_slots(void)
 452{
 453        int num_transfers;
 454        CURLMcode curlm_result;
 455
 456        do {
 457                curlm_result = curl_multi_perform(curlm, &num_transfers);
 458        } while (curlm_result == CURLM_CALL_MULTI_PERFORM);
 459        if (num_transfers < active_requests) {
 460                process_curl_messages();
 461                fill_active_slots();
 462        }
 463}
 464#endif
 465
 466void run_active_slot(struct active_request_slot *slot)
 467{
 468#ifdef USE_CURL_MULTI
 469        long last_pos = 0;
 470        long current_pos;
 471        fd_set readfds;
 472        fd_set writefds;
 473        fd_set excfds;
 474        int max_fd;
 475        struct timeval select_timeout;
 476        int finished = 0;
 477
 478        slot->finished = &finished;
 479        while (!finished) {
 480                data_received = 0;
 481                step_active_slots();
 482
 483                if (!data_received && slot->local != NULL) {
 484                        current_pos = ftell(slot->local);
 485                        if (current_pos > last_pos)
 486                                data_received++;
 487                        last_pos = current_pos;
 488                }
 489
 490                if (slot->in_use && !data_received) {
 491                        max_fd = 0;
 492                        FD_ZERO(&readfds);
 493                        FD_ZERO(&writefds);
 494                        FD_ZERO(&excfds);
 495                        select_timeout.tv_sec = 0;
 496                        select_timeout.tv_usec = 50000;
 497                        select(max_fd, &readfds, &writefds,
 498                               &excfds, &select_timeout);
 499                }
 500        }
 501#else
 502        while (slot->in_use) {
 503                slot->curl_result = curl_easy_perform(slot->curl);
 504                finish_active_slot(slot);
 505        }
 506#endif
 507}
 508
 509static void closedown_active_slot(struct active_request_slot *slot)
 510{
 511        active_requests--;
 512        slot->in_use = 0;
 513}
 514
 515void release_active_slot(struct active_request_slot *slot)
 516{
 517        closedown_active_slot(slot);
 518        if (slot->curl) {
 519#ifdef USE_CURL_MULTI
 520                curl_multi_remove_handle(curlm, slot->curl);
 521#endif
 522                curl_easy_cleanup(slot->curl);
 523                slot->curl = NULL;
 524        }
 525#ifdef USE_CURL_MULTI
 526        fill_active_slots();
 527#endif
 528}
 529
 530static void finish_active_slot(struct active_request_slot *slot)
 531{
 532        closedown_active_slot(slot);
 533        curl_easy_getinfo(slot->curl, CURLINFO_HTTP_CODE, &slot->http_code);
 534
 535        if (slot->finished != NULL)
 536                (*slot->finished) = 1;
 537
 538        /* Store slot results so they can be read after the slot is reused */
 539        if (slot->results != NULL) {
 540                slot->results->curl_result = slot->curl_result;
 541                slot->results->http_code = slot->http_code;
 542        }
 543
 544        /* Run callback if appropriate */
 545        if (slot->callback_func != NULL) {
 546                slot->callback_func(slot->callback_data);
 547        }
 548}
 549
 550void finish_all_active_slots(void)
 551{
 552        struct active_request_slot *slot = active_queue_head;
 553
 554        while (slot != NULL)
 555                if (slot->in_use) {
 556                        run_active_slot(slot);
 557                        slot = active_queue_head;
 558                } else {
 559                        slot = slot->next;
 560                }
 561}