Andrew's git / gitweb.git / http.c
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http.con commit Improve XML parsing in http-push (acf5957)
   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;
  26
  27struct curl_slist *pragma_header;
  28struct curl_slist *no_range_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, 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(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        /* Fall back on the default ones */
 160        return git_default_config(var, value);
 161}
 162
 163void http_init(void)
 164{
 165        char *low_speed_limit;
 166        char *low_speed_time;
 167
 168        curl_global_init(CURL_GLOBAL_ALL);
 169
 170        pragma_header = curl_slist_append(pragma_header, "Pragma: no-cache");
 171        no_range_header = curl_slist_append(no_range_header, "Range:");
 172
 173#ifdef USE_CURL_MULTI
 174        {
 175                char *http_max_requests = getenv("GIT_HTTP_MAX_REQUESTS");
 176                if (http_max_requests != NULL)
 177                        max_requests = atoi(http_max_requests);
 178        }
 179
 180        curlm = curl_multi_init();
 181        if (curlm == NULL) {
 182                fprintf(stderr, "Error creating curl multi handle.\n");
 183                exit(1);
 184        }
 185#endif
 186
 187        if (getenv("GIT_SSL_NO_VERIFY"))
 188                curl_ssl_verify = 0;
 189
 190        ssl_cert = getenv("GIT_SSL_CERT");
 191#if LIBCURL_VERSION_NUM >= 0x070902
 192        ssl_key = getenv("GIT_SSL_KEY");
 193#endif
 194#if LIBCURL_VERSION_NUM >= 0x070908
 195        ssl_capath = getenv("GIT_SSL_CAPATH");
 196#endif
 197        ssl_cainfo = getenv("GIT_SSL_CAINFO");
 198
 199        low_speed_limit = getenv("GIT_HTTP_LOW_SPEED_LIMIT");
 200        if (low_speed_limit != NULL)
 201                curl_low_speed_limit = strtol(low_speed_limit, NULL, 10);
 202        low_speed_time = getenv("GIT_HTTP_LOW_SPEED_TIME");
 203        if (low_speed_time != NULL)
 204                curl_low_speed_time = strtol(low_speed_time, NULL, 10);
 205
 206        git_config(http_options);
 207
 208        if (curl_ssl_verify == -1)
 209                curl_ssl_verify = 1;
 210
 211#ifdef USE_CURL_MULTI
 212        if (max_requests < 1)
 213                max_requests = DEFAULT_MAX_REQUESTS;
 214#endif
 215
 216#ifndef NO_CURL_EASY_DUPHANDLE
 217        curl_default = get_curl_handle();
 218#endif
 219}
 220
 221void http_cleanup(void)
 222{
 223        struct active_request_slot *slot = active_queue_head;
 224#ifdef USE_CURL_MULTI
 225        char *wait_url;
 226        CURLMcode curlm_result;
 227#endif
 228
 229        while (slot != NULL) {
 230#ifdef USE_CURL_MULTI
 231                if (slot->in_use) {
 232                        curl_easy_getinfo(slot->curl,
 233                                          CURLINFO_EFFECTIVE_URL,
 234                                          &wait_url);
 235                        fprintf(stderr, "Waiting for %s\n", wait_url);
 236                        run_active_slot(slot);
 237                }
 238#endif
 239                if (slot->curl != NULL)
 240                        curl_easy_cleanup(slot->curl);
 241                slot = slot->next;
 242        }
 243
 244#ifndef NO_CURL_EASY_DUPHANDLE
 245        curl_easy_cleanup(curl_default);
 246#endif
 247
 248#ifdef USE_CURL_MULTI
 249        curl_multi_cleanup(curlm);
 250#endif
 251        curl_global_cleanup();
 252        
 253}
 254
 255static CURL* get_curl_handle(void)
 256{
 257        CURL* result = curl_easy_init();
 258
 259        curl_easy_setopt(result, CURLOPT_SSL_VERIFYPEER, curl_ssl_verify);
 260#if LIBCURL_VERSION_NUM >= 0x070907
 261        curl_easy_setopt(result, CURLOPT_NETRC, CURL_NETRC_OPTIONAL);
 262#endif
 263
 264        if (ssl_cert != NULL)
 265                curl_easy_setopt(result, CURLOPT_SSLCERT, ssl_cert);
 266#if LIBCURL_VERSION_NUM >= 0x070902
 267        if (ssl_key != NULL)
 268                curl_easy_setopt(result, CURLOPT_SSLKEY, ssl_key);
 269#endif
 270#if LIBCURL_VERSION_NUM >= 0x070908
 271        if (ssl_capath != NULL)
 272                curl_easy_setopt(result, CURLOPT_CAPATH, ssl_capath);
 273#endif
 274        if (ssl_cainfo != NULL)
 275                curl_easy_setopt(result, CURLOPT_CAINFO, ssl_cainfo);
 276        curl_easy_setopt(result, CURLOPT_FAILONERROR, 1);
 277
 278        if (curl_low_speed_limit > 0 && curl_low_speed_time > 0) {
 279                curl_easy_setopt(result, CURLOPT_LOW_SPEED_LIMIT,
 280                                 curl_low_speed_limit);
 281                curl_easy_setopt(result, CURLOPT_LOW_SPEED_TIME,
 282                                 curl_low_speed_time);
 283        }
 284
 285        curl_easy_setopt(result, CURLOPT_FOLLOWLOCATION, 1);
 286
 287        return result;
 288}
 289
 290struct active_request_slot *get_active_slot(void)
 291{
 292        struct active_request_slot *slot = active_queue_head;
 293        struct active_request_slot *newslot;
 294
 295#ifdef USE_CURL_MULTI
 296        int num_transfers;
 297
 298        /* Wait for a slot to open up if the queue is full */
 299        while (active_requests >= max_requests) {
 300                curl_multi_perform(curlm, &num_transfers);
 301                if (num_transfers < active_requests) {
 302                        process_curl_messages();
 303                }
 304        }
 305#endif
 306
 307        while (slot != NULL && slot->in_use) {
 308                slot = slot->next;
 309        }
 310        if (slot == NULL) {
 311                newslot = xmalloc(sizeof(*newslot));
 312                newslot->curl = NULL;
 313                newslot->in_use = 0;
 314                newslot->next = NULL;
 315
 316                slot = active_queue_head;
 317                if (slot == NULL) {
 318                        active_queue_head = newslot;
 319                } else {
 320                        while (slot->next != NULL) {
 321                                slot = slot->next;
 322                        }
 323                        slot->next = newslot;
 324                }
 325                slot = newslot;
 326        }
 327
 328        if (slot->curl == NULL) {
 329#ifdef NO_CURL_EASY_DUPHANDLE
 330                slot->curl = get_curl_handle();
 331#else
 332                slot->curl = curl_easy_duphandle(curl_default);
 333#endif
 334        }
 335
 336        active_requests++;
 337        slot->in_use = 1;
 338        slot->local = NULL;
 339        slot->callback_data = NULL;
 340        slot->callback_func = NULL;
 341        curl_easy_setopt(slot->curl, CURLOPT_HTTPHEADER, pragma_header);
 342        curl_easy_setopt(slot->curl, CURLOPT_HTTPHEADER, no_range_header);
 343        curl_easy_setopt(slot->curl, CURLOPT_ERRORBUFFER, curl_errorstr);
 344
 345        return slot;
 346}
 347
 348int start_active_slot(struct active_request_slot *slot)
 349{
 350#ifdef USE_CURL_MULTI
 351        CURLMcode curlm_result = curl_multi_add_handle(curlm, slot->curl);
 352
 353        if (curlm_result != CURLM_OK &&
 354            curlm_result != CURLM_CALL_MULTI_PERFORM) {
 355                active_requests--;
 356                slot->in_use = 0;
 357                return 0;
 358        }
 359#endif
 360        return 1;
 361}
 362
 363#ifdef USE_CURL_MULTI
 364void step_active_slots(void)
 365{
 366        int num_transfers;
 367        CURLMcode curlm_result;
 368
 369        do {
 370                curlm_result = curl_multi_perform(curlm, &num_transfers);
 371        } while (curlm_result == CURLM_CALL_MULTI_PERFORM);
 372        if (num_transfers < active_requests) {
 373                process_curl_messages();
 374                fill_active_slots();
 375        }
 376}
 377#endif
 378
 379void run_active_slot(struct active_request_slot *slot)
 380{
 381#ifdef USE_CURL_MULTI
 382        long last_pos = 0;
 383        long current_pos;
 384        fd_set readfds;
 385        fd_set writefds;
 386        fd_set excfds;
 387        int max_fd;
 388        struct timeval select_timeout;
 389
 390        while (slot->in_use) {
 391                data_received = 0;
 392                step_active_slots();
 393
 394                if (!data_received && slot->local != NULL) {
 395                        current_pos = ftell(slot->local);
 396                        if (current_pos > last_pos)
 397                                data_received++;
 398                        last_pos = current_pos;
 399                }
 400
 401                if (slot->in_use && !data_received) {
 402                        max_fd = 0;
 403                        FD_ZERO(&readfds);
 404                        FD_ZERO(&writefds);
 405                        FD_ZERO(&excfds);
 406                        select_timeout.tv_sec = 0;
 407                        select_timeout.tv_usec = 50000;
 408                        select(max_fd, &readfds, &writefds,
 409                               &excfds, &select_timeout);
 410                }
 411        }
 412#else
 413        while (slot->in_use) {
 414                slot->curl_result = curl_easy_perform(slot->curl);
 415                finish_active_slot(slot);
 416        }
 417#endif
 418}
 419
 420static void finish_active_slot(struct active_request_slot *slot)
 421{
 422        active_requests--;
 423        slot->in_use = 0;
 424        curl_easy_getinfo(slot->curl, CURLINFO_HTTP_CODE, &slot->http_code);
 425 
 426        /* Run callback if appropriate */
 427        if (slot->callback_func != NULL) {
 428                slot->callback_func(slot->callback_data);
 429        }
 430}
 431
 432void finish_all_active_slots(void)
 433{
 434        struct active_request_slot *slot = active_queue_head;
 435
 436        while (slot != NULL)
 437                if (slot->in_use) {
 438                        run_active_slot(slot);
 439                        slot = active_queue_head;
 440                } else {
 441                        slot = slot->next;
 442                }
 443}