Andrew's git / gitweb.git / http.c
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http.con commit Supplant the "while case ... break ;; esac" idiom (822f7c7)
   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#ifdef USE_CURL_MULTI
 280                if (slot->in_use) {
 281                        curl_easy_getinfo(slot->curl,
 282                                          CURLINFO_EFFECTIVE_URL,
 283                                          &wait_url);
 284                        fprintf(stderr, "Waiting for %s\n", wait_url);
 285                        run_active_slot(slot);
 286                }
 287#endif
 288                if (slot->curl != NULL)
 289                        curl_easy_cleanup(slot->curl);
 290                slot = slot->next;
 291        }
 292
 293#ifndef NO_CURL_EASY_DUPHANDLE
 294        curl_easy_cleanup(curl_default);
 295#endif
 296
 297#ifdef USE_CURL_MULTI
 298        curl_multi_cleanup(curlm);
 299#endif
 300        curl_global_cleanup();
 301
 302        curl_slist_free_all(pragma_header);
 303        pragma_header = NULL;
 304}
 305
 306struct active_request_slot *get_active_slot(void)
 307{
 308        struct active_request_slot *slot = active_queue_head;
 309        struct active_request_slot *newslot;
 310
 311#ifdef USE_CURL_MULTI
 312        int num_transfers;
 313
 314        /* Wait for a slot to open up if the queue is full */
 315        while (active_requests >= max_requests) {
 316                curl_multi_perform(curlm, &num_transfers);
 317                if (num_transfers < active_requests) {
 318                        process_curl_messages();
 319                }
 320        }
 321#endif
 322
 323        while (slot != NULL && slot->in_use) {
 324                slot = slot->next;
 325        }
 326        if (slot == NULL) {
 327                newslot = xmalloc(sizeof(*newslot));
 328                newslot->curl = NULL;
 329                newslot->in_use = 0;
 330                newslot->next = NULL;
 331
 332                slot = active_queue_head;
 333                if (slot == NULL) {
 334                        active_queue_head = newslot;
 335                } else {
 336                        while (slot->next != NULL) {
 337                                slot = slot->next;
 338                        }
 339                        slot->next = newslot;
 340                }
 341                slot = newslot;
 342        }
 343
 344        if (slot->curl == NULL) {
 345#ifdef NO_CURL_EASY_DUPHANDLE
 346                slot->curl = get_curl_handle();
 347#else
 348                slot->curl = curl_easy_duphandle(curl_default);
 349#endif
 350        }
 351
 352        active_requests++;
 353        slot->in_use = 1;
 354        slot->local = NULL;
 355        slot->results = NULL;
 356        slot->finished = NULL;
 357        slot->callback_data = NULL;
 358        slot->callback_func = NULL;
 359        curl_easy_setopt(slot->curl, CURLOPT_HTTPHEADER, NULL);
 360        curl_easy_setopt(slot->curl, CURLOPT_HTTPHEADER, pragma_header);
 361        curl_easy_setopt(slot->curl, CURLOPT_ERRORBUFFER, curl_errorstr);
 362        curl_easy_setopt(slot->curl, CURLOPT_CUSTOMREQUEST, NULL);
 363        curl_easy_setopt(slot->curl, CURLOPT_READFUNCTION, NULL);
 364        curl_easy_setopt(slot->curl, CURLOPT_WRITEFUNCTION, NULL);
 365        curl_easy_setopt(slot->curl, CURLOPT_UPLOAD, 0);
 366        curl_easy_setopt(slot->curl, CURLOPT_HTTPGET, 1);
 367
 368        return slot;
 369}
 370
 371int start_active_slot(struct active_request_slot *slot)
 372{
 373#ifdef USE_CURL_MULTI
 374        CURLMcode curlm_result = curl_multi_add_handle(curlm, slot->curl);
 375
 376        if (curlm_result != CURLM_OK &&
 377            curlm_result != CURLM_CALL_MULTI_PERFORM) {
 378                active_requests--;
 379                slot->in_use = 0;
 380                return 0;
 381        }
 382#endif
 383        return 1;
 384}
 385
 386#ifdef USE_CURL_MULTI
 387void step_active_slots(void)
 388{
 389        int num_transfers;
 390        CURLMcode curlm_result;
 391
 392        do {
 393                curlm_result = curl_multi_perform(curlm, &num_transfers);
 394        } while (curlm_result == CURLM_CALL_MULTI_PERFORM);
 395        if (num_transfers < active_requests) {
 396                process_curl_messages();
 397                fill_active_slots();
 398        }
 399}
 400#endif
 401
 402void run_active_slot(struct active_request_slot *slot)
 403{
 404#ifdef USE_CURL_MULTI
 405        long last_pos = 0;
 406        long current_pos;
 407        fd_set readfds;
 408        fd_set writefds;
 409        fd_set excfds;
 410        int max_fd;
 411        struct timeval select_timeout;
 412        int finished = 0;
 413
 414        slot->finished = &finished;
 415        while (!finished) {
 416                data_received = 0;
 417                step_active_slots();
 418
 419                if (!data_received && slot->local != NULL) {
 420                        current_pos = ftell(slot->local);
 421                        if (current_pos > last_pos)
 422                                data_received++;
 423                        last_pos = current_pos;
 424                }
 425
 426                if (slot->in_use && !data_received) {
 427                        max_fd = 0;
 428                        FD_ZERO(&readfds);
 429                        FD_ZERO(&writefds);
 430                        FD_ZERO(&excfds);
 431                        select_timeout.tv_sec = 0;
 432                        select_timeout.tv_usec = 50000;
 433                        select(max_fd, &readfds, &writefds,
 434                               &excfds, &select_timeout);
 435                }
 436        }
 437#else
 438        while (slot->in_use) {
 439                slot->curl_result = curl_easy_perform(slot->curl);
 440                finish_active_slot(slot);
 441        }
 442#endif
 443}
 444
 445static void closedown_active_slot(struct active_request_slot *slot)
 446{
 447        active_requests--;
 448        slot->in_use = 0;
 449}
 450
 451void release_active_slot(struct active_request_slot *slot)
 452{
 453        closedown_active_slot(slot);
 454        if (slot->curl) {
 455#ifdef USE_CURL_MULTI
 456                curl_multi_remove_handle(curlm, slot->curl);
 457#endif
 458                curl_easy_cleanup(slot->curl);
 459                slot->curl = NULL;
 460        }
 461#ifdef USE_CURL_MULTI
 462        fill_active_slots();
 463#endif
 464}
 465
 466static void finish_active_slot(struct active_request_slot *slot)
 467{
 468        closedown_active_slot(slot);
 469        curl_easy_getinfo(slot->curl, CURLINFO_HTTP_CODE, &slot->http_code);
 470
 471        if (slot->finished != NULL)
 472                (*slot->finished) = 1;
 473
 474        /* Store slot results so they can be read after the slot is reused */
 475        if (slot->results != NULL) {
 476                slot->results->curl_result = slot->curl_result;
 477                slot->results->http_code = slot->http_code;
 478        }
 479
 480        /* Run callback if appropriate */
 481        if (slot->callback_func != NULL) {
 482                slot->callback_func(slot->callback_data);
 483        }
 484}
 485
 486void finish_all_active_slots(void)
 487{
 488        struct active_request_slot *slot = active_queue_head;
 489
 490        while (slot != NULL)
 491                if (slot->in_use) {
 492                        run_active_slot(slot);
 493                        slot = active_queue_head;
 494                } else {
 495                        slot = slot->next;
 496                }
 497}