Andrew's git / gitweb.git / http.c
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http.con commit git-fetch: Always fetch tags if the object they reference exists (a3b0079)
   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;
  27
  28struct curl_slist *pragma_header;
  29
  30struct active_request_slot *active_queue_head = NULL;
  31
  32size_t fread_buffer(void *ptr, size_t eltsize, size_t nmemb,
  33                           struct buffer *buffer)
  34{
  35        size_t size = eltsize * nmemb;
  36        if (size > buffer->size - buffer->posn)
  37                size = buffer->size - buffer->posn;
  38        memcpy(ptr, (char *) buffer->buffer + buffer->posn, size);
  39        buffer->posn += size;
  40        return size;
  41}
  42
  43size_t fwrite_buffer(const void *ptr, size_t eltsize,
  44                            size_t nmemb, struct buffer *buffer)
  45{
  46        size_t size = eltsize * nmemb;
  47        if (size > buffer->size - buffer->posn) {
  48                buffer->size = buffer->size * 3 / 2;
  49                if (buffer->size < buffer->posn + size)
  50                        buffer->size = buffer->posn + size;
  51                buffer->buffer = xrealloc(buffer->buffer, buffer->size);
  52        }
  53        memcpy((char *) buffer->buffer + buffer->posn, ptr, size);
  54        buffer->posn += size;
  55        data_received++;
  56        return size;
  57}
  58
  59size_t fwrite_null(const void *ptr, size_t eltsize,
  60                          size_t nmemb, struct buffer *buffer)
  61{
  62        data_received++;
  63        return eltsize * nmemb;
  64}
  65
  66static void finish_active_slot(struct active_request_slot *slot);
  67
  68#ifdef USE_CURL_MULTI
  69static void process_curl_messages(void)
  70{
  71        int num_messages;
  72        struct active_request_slot *slot;
  73        CURLMsg *curl_message = curl_multi_info_read(curlm, &num_messages);
  74
  75        while (curl_message != NULL) {
  76                if (curl_message->msg == CURLMSG_DONE) {
  77                        int curl_result = curl_message->data.result;
  78                        slot = active_queue_head;
  79                        while (slot != NULL &&
  80                               slot->curl != curl_message->easy_handle)
  81                                slot = slot->next;
  82                        if (slot != NULL) {
  83                                curl_multi_remove_handle(curlm, slot->curl);
  84                                slot->curl_result = curl_result;
  85                                finish_active_slot(slot);
  86                        } else {
  87                                fprintf(stderr, "Received DONE message for unknown request!\n");
  88                        }
  89                } else {
  90                        fprintf(stderr, "Unknown CURL message received: %d\n",
  91                                (int)curl_message->msg);
  92                }
  93                curl_message = curl_multi_info_read(curlm, &num_messages);
  94        }
  95}
  96#endif
  97
  98static int http_options(const char *var, const char *value)
  99{
 100        if (!strcmp("http.sslverify", var)) {
 101                if (curl_ssl_verify == -1) {
 102                        curl_ssl_verify = git_config_bool(var, value);
 103                }
 104                return 0;
 105        }
 106
 107        if (!strcmp("http.sslcert", var)) {
 108                if (ssl_cert == NULL) {
 109                        ssl_cert = xmalloc(strlen(value)+1);
 110                        strcpy(ssl_cert, value);
 111                }
 112                return 0;
 113        }
 114#if LIBCURL_VERSION_NUM >= 0x070902
 115        if (!strcmp("http.sslkey", var)) {
 116                if (ssl_key == NULL) {
 117                        ssl_key = xmalloc(strlen(value)+1);
 118                        strcpy(ssl_key, value);
 119                }
 120                return 0;
 121        }
 122#endif
 123#if LIBCURL_VERSION_NUM >= 0x070908
 124        if (!strcmp("http.sslcapath", var)) {
 125                if (ssl_capath == NULL) {
 126                        ssl_capath = xmalloc(strlen(value)+1);
 127                        strcpy(ssl_capath, value);
 128                }
 129                return 0;
 130        }
 131#endif
 132        if (!strcmp("http.sslcainfo", var)) {
 133                if (ssl_cainfo == NULL) {
 134                        ssl_cainfo = xmalloc(strlen(value)+1);
 135                        strcpy(ssl_cainfo, 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
 164        /* Fall back on the default ones */
 165        return git_default_config(var, value);
 166}
 167
 168static CURL* get_curl_handle(void)
 169{
 170        CURL* result = curl_easy_init();
 171
 172        curl_easy_setopt(result, CURLOPT_SSL_VERIFYPEER, curl_ssl_verify);
 173#if LIBCURL_VERSION_NUM >= 0x070907
 174        curl_easy_setopt(result, CURLOPT_NETRC, CURL_NETRC_OPTIONAL);
 175#endif
 176
 177        if (ssl_cert != NULL)
 178                curl_easy_setopt(result, CURLOPT_SSLCERT, ssl_cert);
 179#if LIBCURL_VERSION_NUM >= 0x070902
 180        if (ssl_key != NULL)
 181                curl_easy_setopt(result, CURLOPT_SSLKEY, ssl_key);
 182#endif
 183#if LIBCURL_VERSION_NUM >= 0x070908
 184        if (ssl_capath != NULL)
 185                curl_easy_setopt(result, CURLOPT_CAPATH, ssl_capath);
 186#endif
 187        if (ssl_cainfo != NULL)
 188                curl_easy_setopt(result, CURLOPT_CAINFO, ssl_cainfo);
 189        curl_easy_setopt(result, CURLOPT_FAILONERROR, 1);
 190
 191        if (curl_low_speed_limit > 0 && curl_low_speed_time > 0) {
 192                curl_easy_setopt(result, CURLOPT_LOW_SPEED_LIMIT,
 193                                 curl_low_speed_limit);
 194                curl_easy_setopt(result, CURLOPT_LOW_SPEED_TIME,
 195                                 curl_low_speed_time);
 196        }
 197
 198        curl_easy_setopt(result, CURLOPT_FOLLOWLOCATION, 1);
 199
 200        if (getenv("GIT_CURL_VERBOSE"))
 201                curl_easy_setopt(result, CURLOPT_VERBOSE, 1);
 202
 203        curl_easy_setopt(result, CURLOPT_USERAGENT, GIT_USER_AGENT);
 204
 205        if (curl_ftp_no_epsv)
 206                curl_easy_setopt(result, CURLOPT_FTP_USE_EPSV, 0);
 207
 208        return result;
 209}
 210
 211void http_init(void)
 212{
 213        char *low_speed_limit;
 214        char *low_speed_time;
 215
 216        curl_global_init(CURL_GLOBAL_ALL);
 217
 218        pragma_header = curl_slist_append(pragma_header, "Pragma: no-cache");
 219
 220#ifdef USE_CURL_MULTI
 221        {
 222                char *http_max_requests = getenv("GIT_HTTP_MAX_REQUESTS");
 223                if (http_max_requests != NULL)
 224                        max_requests = atoi(http_max_requests);
 225        }
 226
 227        curlm = curl_multi_init();
 228        if (curlm == NULL) {
 229                fprintf(stderr, "Error creating curl multi handle.\n");
 230                exit(1);
 231        }
 232#endif
 233
 234        if (getenv("GIT_SSL_NO_VERIFY"))
 235                curl_ssl_verify = 0;
 236
 237        ssl_cert = getenv("GIT_SSL_CERT");
 238#if LIBCURL_VERSION_NUM >= 0x070902
 239        ssl_key = getenv("GIT_SSL_KEY");
 240#endif
 241#if LIBCURL_VERSION_NUM >= 0x070908
 242        ssl_capath = getenv("GIT_SSL_CAPATH");
 243#endif
 244        ssl_cainfo = getenv("GIT_SSL_CAINFO");
 245
 246        low_speed_limit = getenv("GIT_HTTP_LOW_SPEED_LIMIT");
 247        if (low_speed_limit != NULL)
 248                curl_low_speed_limit = strtol(low_speed_limit, NULL, 10);
 249        low_speed_time = getenv("GIT_HTTP_LOW_SPEED_TIME");
 250        if (low_speed_time != NULL)
 251                curl_low_speed_time = strtol(low_speed_time, NULL, 10);
 252
 253        git_config(http_options);
 254
 255        if (curl_ssl_verify == -1)
 256                curl_ssl_verify = 1;
 257
 258#ifdef USE_CURL_MULTI
 259        if (max_requests < 1)
 260                max_requests = DEFAULT_MAX_REQUESTS;
 261#endif
 262
 263        if (getenv("GIT_CURL_FTP_NO_EPSV"))
 264                curl_ftp_no_epsv = 1;
 265
 266#ifndef NO_CURL_EASY_DUPHANDLE
 267        curl_default = get_curl_handle();
 268#endif
 269}
 270
 271void http_cleanup(void)
 272{
 273        struct active_request_slot *slot = active_queue_head;
 274#ifdef USE_CURL_MULTI
 275        char *wait_url;
 276#endif
 277
 278        while (slot != NULL) {
 279                struct active_request_slot *next = slot->next;
 280#ifdef USE_CURL_MULTI
 281                if (slot->in_use) {
 282                        curl_easy_getinfo(slot->curl,
 283                                          CURLINFO_EFFECTIVE_URL,
 284                                          &wait_url);
 285                        fprintf(stderr, "Waiting for %s\n", wait_url);
 286                        run_active_slot(slot);
 287                }
 288#endif
 289                if (slot->curl != NULL)
 290                        curl_easy_cleanup(slot->curl);
 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
 309struct active_request_slot *get_active_slot(void)
 310{
 311        struct active_request_slot *slot = active_queue_head;
 312        struct active_request_slot *newslot;
 313
 314#ifdef USE_CURL_MULTI
 315        int num_transfers;
 316
 317        /* Wait for a slot to open up if the queue is full */
 318        while (active_requests >= max_requests) {
 319                curl_multi_perform(curlm, &num_transfers);
 320                if (num_transfers < active_requests) {
 321                        process_curl_messages();
 322                }
 323        }
 324#endif
 325
 326        while (slot != NULL && slot->in_use) {
 327                slot = slot->next;
 328        }
 329        if (slot == NULL) {
 330                newslot = xmalloc(sizeof(*newslot));
 331                newslot->curl = NULL;
 332                newslot->in_use = 0;
 333                newslot->next = NULL;
 334
 335                slot = active_queue_head;
 336                if (slot == NULL) {
 337                        active_queue_head = newslot;
 338                } else {
 339                        while (slot->next != NULL) {
 340                                slot = slot->next;
 341                        }
 342                        slot->next = newslot;
 343                }
 344                slot = newslot;
 345        }
 346
 347        if (slot->curl == NULL) {
 348#ifdef NO_CURL_EASY_DUPHANDLE
 349                slot->curl = get_curl_handle();
 350#else
 351                slot->curl = curl_easy_duphandle(curl_default);
 352#endif
 353        }
 354
 355        active_requests++;
 356        slot->in_use = 1;
 357        slot->local = NULL;
 358        slot->results = NULL;
 359        slot->finished = NULL;
 360        slot->callback_data = NULL;
 361        slot->callback_func = NULL;
 362        curl_easy_setopt(slot->curl, CURLOPT_HTTPHEADER, NULL);
 363        curl_easy_setopt(slot->curl, CURLOPT_HTTPHEADER, pragma_header);
 364        curl_easy_setopt(slot->curl, CURLOPT_ERRORBUFFER, curl_errorstr);
 365        curl_easy_setopt(slot->curl, CURLOPT_CUSTOMREQUEST, NULL);
 366        curl_easy_setopt(slot->curl, CURLOPT_READFUNCTION, NULL);
 367        curl_easy_setopt(slot->curl, CURLOPT_WRITEFUNCTION, NULL);
 368        curl_easy_setopt(slot->curl, CURLOPT_UPLOAD, 0);
 369        curl_easy_setopt(slot->curl, CURLOPT_HTTPGET, 1);
 370
 371        return slot;
 372}
 373
 374int start_active_slot(struct active_request_slot *slot)
 375{
 376#ifdef USE_CURL_MULTI
 377        CURLMcode curlm_result = curl_multi_add_handle(curlm, slot->curl);
 378        int num_transfers;
 379
 380        if (curlm_result != CURLM_OK &&
 381            curlm_result != CURLM_CALL_MULTI_PERFORM) {
 382                active_requests--;
 383                slot->in_use = 0;
 384                return 0;
 385        }
 386
 387        /*
 388         * We know there must be something to do, since we just added
 389         * something.
 390         */
 391        curl_multi_perform(curlm, &num_transfers);
 392#endif
 393        return 1;
 394}
 395
 396#ifdef USE_CURL_MULTI
 397struct fill_chain {
 398        void *data;
 399        int (*fill)(void *);
 400        struct fill_chain *next;
 401};
 402
 403static struct fill_chain *fill_cfg = NULL;
 404
 405void add_fill_function(void *data, int (*fill)(void *))
 406{
 407        struct fill_chain *new = malloc(sizeof(*new));
 408        struct fill_chain **linkp = &fill_cfg;
 409        new->data = data;
 410        new->fill = fill;
 411        new->next = NULL;
 412        while (*linkp)
 413                linkp = &(*linkp)->next;
 414        *linkp = new;
 415}
 416
 417void fill_active_slots(void)
 418{
 419        struct active_request_slot *slot = active_queue_head;
 420
 421        while (active_requests < max_requests) {
 422                struct fill_chain *fill;
 423                for (fill = fill_cfg; fill; fill = fill->next)
 424                        if (fill->fill(fill->data))
 425                                break;
 426
 427                if (!fill)
 428                        break;
 429        }
 430
 431        while (slot != NULL) {
 432                if (!slot->in_use && slot->curl != NULL) {
 433                        curl_easy_cleanup(slot->curl);
 434                        slot->curl = NULL;
 435                }
 436                slot = slot->next;
 437        }
 438}
 439
 440void step_active_slots(void)
 441{
 442        int num_transfers;
 443        CURLMcode curlm_result;
 444
 445        do {
 446                curlm_result = curl_multi_perform(curlm, &num_transfers);
 447        } while (curlm_result == CURLM_CALL_MULTI_PERFORM);
 448        if (num_transfers < active_requests) {
 449                process_curl_messages();
 450                fill_active_slots();
 451        }
 452}
 453#endif
 454
 455void run_active_slot(struct active_request_slot *slot)
 456{
 457#ifdef USE_CURL_MULTI
 458        long last_pos = 0;
 459        long current_pos;
 460        fd_set readfds;
 461        fd_set writefds;
 462        fd_set excfds;
 463        int max_fd;
 464        struct timeval select_timeout;
 465        int finished = 0;
 466
 467        slot->finished = &finished;
 468        while (!finished) {
 469                data_received = 0;
 470                step_active_slots();
 471
 472                if (!data_received && slot->local != NULL) {
 473                        current_pos = ftell(slot->local);
 474                        if (current_pos > last_pos)
 475                                data_received++;
 476                        last_pos = current_pos;
 477                }
 478
 479                if (slot->in_use && !data_received) {
 480                        max_fd = 0;
 481                        FD_ZERO(&readfds);
 482                        FD_ZERO(&writefds);
 483                        FD_ZERO(&excfds);
 484                        select_timeout.tv_sec = 0;
 485                        select_timeout.tv_usec = 50000;
 486                        select(max_fd, &readfds, &writefds,
 487                               &excfds, &select_timeout);
 488                }
 489        }
 490#else
 491        while (slot->in_use) {
 492                slot->curl_result = curl_easy_perform(slot->curl);
 493                finish_active_slot(slot);
 494        }
 495#endif
 496}
 497
 498static void closedown_active_slot(struct active_request_slot *slot)
 499{
 500        active_requests--;
 501        slot->in_use = 0;
 502}
 503
 504void release_active_slot(struct active_request_slot *slot)
 505{
 506        closedown_active_slot(slot);
 507        if (slot->curl) {
 508#ifdef USE_CURL_MULTI
 509                curl_multi_remove_handle(curlm, slot->curl);
 510#endif
 511                curl_easy_cleanup(slot->curl);
 512                slot->curl = NULL;
 513        }
 514#ifdef USE_CURL_MULTI
 515        fill_active_slots();
 516#endif
 517}
 518
 519static void finish_active_slot(struct active_request_slot *slot)
 520{
 521        closedown_active_slot(slot);
 522        curl_easy_getinfo(slot->curl, CURLINFO_HTTP_CODE, &slot->http_code);
 523
 524        if (slot->finished != NULL)
 525                (*slot->finished) = 1;
 526
 527        /* Store slot results so they can be read after the slot is reused */
 528        if (slot->results != NULL) {
 529                slot->results->curl_result = slot->curl_result;
 530                slot->results->http_code = slot->http_code;
 531        }
 532
 533        /* Run callback if appropriate */
 534        if (slot->callback_func != NULL) {
 535                slot->callback_func(slot->callback_data);
 536        }
 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}