src/connections.c

   1 #include "first.h"
   2
   3 #include "buffer.h"
   4 #include "server.h"
   5 #include "log.h"
   6 #include "connections.h"
   7 #include "fdevent.h"
   8
   9 #include "configfile.h"
  10 #include "request.h"
  11 #include "response.h"
  12 #include "network.h"
  13 #include "http_chunk.h"
  14 #include "stat_cache.h"
  15 #include "joblist.h"
  16
  17 #include "plugin.h"
  18
  19 #include "inet_ntop_cache.h"
  20
  21 #include <sys/stat.h>
  22
  23 #include <stdlib.h>
  24 #include <stdio.h>
  25 #include <unistd.h>
  26 #include <errno.h>
  27 #include <string.h>
  28 #include <fcntl.h>
  29 #include <assert.h>
  30
  31 #ifdef USE_OPENSSL
  32 # include <openssl/ssl.h>
  33 # include <openssl/err.h>
  34 #endif
  35
  36 #ifdef HAVE_SYS_FILIO_H
  37 # include <sys/filio.h>
  38 #endif
  39
  40 #include "sys-socket.h"
  41
  42 typedef struct {
  43                 PLUGIN_DATA;
  44 } plugin_data;
  45
  46 static connection *connections_get_new_connection(server *srv) {
  47         connections *conns = srv->conns;
  48         size_t i;
  49
  50         if (conns->size == 0) {
  51                 conns->size = 128;
  52                 conns->ptr = NULL;
  53                 conns->ptr = malloc(sizeof(*conns->ptr) * conns->size);
  54                 force_assert(NULL != conns->ptr);
  55                 for (i = 0; i < conns->size; i++) {
  56                         conns->ptr[i] = connection_init(srv);
  57                 }
  58         } else if (conns->size == conns->used) {
  59                 conns->size += 128;
  60                 conns->ptr = realloc(conns->ptr, sizeof(*conns->ptr) * conns->size);
  61                 force_assert(NULL != conns->ptr);
  62
  63                 for (i = conns->used; i < conns->size; i++) {
  64                         conns->ptr[i] = connection_init(srv);
  65                 }
  66         }
  67
  68         connection_reset(srv, conns->ptr[conns->used]);
  69 #if 0
  70         fprintf(stderr, "%s.%d: add: ", __FILE__, __LINE__);
  71         for (i = 0; i < conns->used + 1; i++) {
  72                 fprintf(stderr, "%d ", conns->ptr[i]->fd);
  73         }
  74         fprintf(stderr, "\n");
  75 #endif
  76
  77         conns->ptr[conns->used]->ndx = conns->used;
  78         return conns->ptr[conns->used++];
  79 }
  80
  81 static int connection_del(server *srv, connection *con) {
  82         size_t i;
  83         connections *conns = srv->conns;
  84         connection *temp;
  85
  86         if (con == NULL) return -1;
  87
  88         if (-1 == con->ndx) return -1;
  89
  90         buffer_reset(con->uri.authority);
  91         buffer_reset(con->uri.path);
  92         buffer_reset(con->uri.query);
  93         buffer_reset(con->request.orig_uri);
  94
  95         i = con->ndx;
  96
  97         /* not last element */
  98
  99         if (i != conns->used - 1) {
 100                 temp = conns->ptr[i];
 101                 conns->ptr[i] = conns->ptr[conns->used - 1];
 102                 conns->ptr[conns->used - 1] = temp;
 103
 104                 conns->ptr[i]->ndx = i;
 105                 conns->ptr[conns->used - 1]->ndx = -1;
 106         }
 107
 108         conns->used--;
 109
 110         con->ndx = -1;
 111 #if 0
 112         fprintf(stderr, "%s.%d: del: (%d)", __FILE__, __LINE__, conns->used);
 113         for (i = 0; i < conns->used; i++) {
 114                 fprintf(stderr, "%d ", conns->ptr[i]->fd);
 115         }
 116         fprintf(stderr, "\n");
 117 #endif
 118         return 0;
 119 }
 120
 121 static int connection_close(server *srv, connection *con) {
 122 #ifdef USE_OPENSSL
 123         server_socket *srv_sock = con->srv_socket;
 124 #endif
 125
 126 #ifdef USE_OPENSSL
 127         if (srv_sock->is_ssl) {
 128                 if (con->ssl) SSL_free(con->ssl);
 129                 con->ssl = NULL;
 130         }
 131 #endif
 132
 133         fdevent_event_del(srv->ev, &(con->fde_ndx), con->fd);
 134         fdevent_unregister(srv->ev, con->fd);
 135 #ifdef __WIN32
 136         if (closesocket(con->fd)) {
 137                 log_error_write(srv, __FILE__, __LINE__, "sds",
 138                                 "(warning) close:", con->fd, strerror(errno));
 139         }
 140 #else
 141         if (close(con->fd)) {
 142                 log_error_write(srv, __FILE__, __LINE__, "sds",
 143                                 "(warning) close:", con->fd, strerror(errno));
 144         }
 145 #endif
 146         con->fd = -1;
 147
 148         srv->cur_fds--;
 149 #if 0
 150         log_error_write(srv, __FILE__, __LINE__, "sd",
 151                         "closed()", con->fd);
 152 #endif
 153
 154         connection_del(srv, con);
 155         connection_set_state(srv, con, CON_STATE_CONNECT);
 156
 157         return 0;
 158 }
 159
 160 static void connection_handle_errdoc_init(server *srv, connection *con) {
 161         /* modules that produce headers required with error response should
 162          * typically also produce an error document.  Make an exception for
 163          * mod_auth WWW-Authenticate response header. */
 164         buffer *www_auth = NULL;
 165         if (401 == con->http_status) {
 166                 data_string *ds = (data_string *)array_get_element(con->response.headers, "WWW-Authenticate");
 167                 if (NULL != ds) {
 168                         www_auth = buffer_init_buffer(ds->value);
 169                 }
 170         }
 171
 172         con->response.transfer_encoding = 0;
 173         buffer_reset(con->physical.path);
 174         array_reset(con->response.headers);
 175         chunkqueue_reset(con->write_queue);
 176
 177         if (NULL != www_auth) {
 178                 response_header_insert(srv, con, CONST_STR_LEN("WWW-Authenticate"), CONST_BUF_LEN(www_auth));
 179                 buffer_free(www_auth);
 180         }
 181 }
 182
 183 static int connection_handle_write_prepare(server *srv, connection *con) {
 184         if (con->mode == DIRECT) {
 185                 /* static files */
 186                 switch(con->request.http_method) {
 187                 case HTTP_METHOD_GET:
 188                 case HTTP_METHOD_POST:
 189                 case HTTP_METHOD_HEAD:
 190                         break;
 191                 case HTTP_METHOD_OPTIONS:
 192                         /*
 193                          * 400 is coming from the request-parser BEFORE uri.path is set
 194                          * 403 is from the response handler when noone else catched it
 195                          *
 196                          * */
 197                         if ((!con->http_status || con->http_status == 200) && !buffer_string_is_empty(con->uri.path) &&
 198                             con->uri.path->ptr[0] != '*') {
 199                                 response_header_insert(srv, con, CONST_STR_LEN("Allow"), CONST_STR_LEN("OPTIONS, GET, HEAD, POST"));
 200
 201                                 con->response.transfer_encoding &= ~HTTP_TRANSFER_ENCODING_CHUNKED;
 202                                 con->parsed_response &= ~HTTP_CONTENT_LENGTH;
 203
 204                                 con->http_status = 200;
 205                                 con->file_finished = 1;
 206
 207                                 chunkqueue_reset(con->write_queue);
 208                         }
 209                         break;
 210                 default:
 211                         if (0 == con->http_status) {
 212                                 con->http_status = 501;
 213                         }
 214                         break;
 215                 }
 216         }
 217
 218         if (con->http_status == 0) {
 219                 con->http_status = 403;
 220         }
 221
 222         switch(con->http_status) {
 223         case 204: /* class: header only */
 224         case 205:
 225         case 304:
 226                 /* disable chunked encoding again as we have no body */
 227                 con->response.transfer_encoding &= ~HTTP_TRANSFER_ENCODING_CHUNKED;
 228                 con->parsed_response &= ~HTTP_CONTENT_LENGTH;
 229                 chunkqueue_reset(con->write_queue);
 230
 231                 con->file_finished = 1;
 232                 break;
 233         default: /* class: header + body */
 234                 if (con->mode != DIRECT) break;
 235
 236                 /* only custom body for 4xx and 5xx */
 237                 if (con->http_status < 400 || con->http_status >= 600) break;
 238
 239                 con->file_finished = 0;
 240
 241                 connection_handle_errdoc_init(srv, con);
 242
 243                 /* try to send static errorfile */
 244                 if (!buffer_string_is_empty(con->conf.errorfile_prefix)) {
 245                         stat_cache_entry *sce = NULL;
 246
 247                         buffer_copy_buffer(con->physical.path, con->conf.errorfile_prefix);
 248                         buffer_append_int(con->physical.path, con->http_status);
 249                         buffer_append_string_len(con->physical.path, CONST_STR_LEN(".html"));
 250
 251                         if (0 == http_chunk_append_file(srv, con, con->physical.path)) {
 252                                 con->file_finished = 1;
 253                                 if (HANDLER_ERROR != stat_cache_get_entry(srv, con, con->physical.path, &sce)) {
 254                                         response_header_overwrite(srv, con, CONST_STR_LEN("Content-Type"), CONST_BUF_LEN(sce->content_type));
 255                                 }
 256                         }
 257                 }
 258
 259                 if (!con->file_finished) {
 260                         buffer *b;
 261
 262                         buffer_reset(con->physical.path);
 263
 264                         con->file_finished = 1;
 265                         b = buffer_init();
 266
 267                         /* build default error-page */
 268                         buffer_copy_string_len(b, CONST_STR_LEN(
 269                                            "<?xml version=\"1.0\" encoding=\"iso-8859-1\"?>\n"
 270                                            "<!DOCTYPE html PUBLIC \"-//W3C//DTD XHTML 1.0 Transitional//EN\"\n"
 271                                            "         \"http://www.w3.org/TR/xhtml1/DTD/xhtml1-transitional.dtd\">\n"
 272                                            "<html xmlns=\"http://www.w3.org/1999/xhtml\" xml:lang=\"en\" lang=\"en\">\n"
 273                                            " <head>\n"
 274                                            "  <title>"));
 275                         buffer_append_int(b, con->http_status);
 276                         buffer_append_string_len(b, CONST_STR_LEN(" - "));
 277                         buffer_append_string(b, get_http_status_name(con->http_status));
 278
 279                         buffer_append_string_len(b, CONST_STR_LEN(
 280                                              "</title>\n"
 281                                              " </head>\n"
 282                                              " <body>\n"
 283                                              "  <h1>"));
 284                         buffer_append_int(b, con->http_status);
 285                         buffer_append_string_len(b, CONST_STR_LEN(" - "));
 286                         buffer_append_string(b, get_http_status_name(con->http_status));
 287
 288                         buffer_append_string_len(b, CONST_STR_LEN("</h1>\n"
 289                                              " </body>\n"
 290                                              "</html>\n"
 291                                              ));
 292
 293                         (void)http_chunk_append_buffer(srv, con, b);
 294                         buffer_free(b);
 295
 296                         response_header_overwrite(srv, con, CONST_STR_LEN("Content-Type"), CONST_STR_LEN("text/html"));
 297                 }
 298                 break;
 299         }
 300
 301         if (con->file_finished) {
 302                 /* we have all the content and chunked encoding is not used, set a content-length */
 303
 304                 if ((!(con->parsed_response & HTTP_CONTENT_LENGTH)) &&
 305                     (con->response.transfer_encoding & HTTP_TRANSFER_ENCODING_CHUNKED) == 0) {
 306                         off_t qlen = chunkqueue_length(con->write_queue);
 307
 308                         /**
 309                          * The Content-Length header only can be sent if we have content:
 310                          * - HEAD doesn't have a content-body (but have a content-length)
 311                          * - 1xx, 204 and 304 don't have a content-body (RFC 2616 Section 4.3)
 312                          *
 313                          * Otherwise generate a Content-Length header as chunked encoding is not
 314                          * available
 315                          */
 316                         if ((con->http_status >= 100 && con->http_status < 200) ||
 317                             con->http_status == 204 ||
 318                             con->http_status == 304) {
 319                                 data_string *ds;
 320                                 /* no Content-Body, no Content-Length */
 321                                 if (NULL != (ds = (data_string*) array_get_element(con->response.headers, "Content-Length"))) {
 322                                         buffer_reset(ds->value); /* Headers with empty values are ignored for output */
 323                                 }
 324                         } else if (qlen > 0 || con->request.http_method != HTTP_METHOD_HEAD) {
 325                                 /* qlen = 0 is important for Redirects (301, ...) as they MAY have
 326                                  * a content. Browsers are waiting for a Content otherwise
 327                                  */
 328                                 buffer_copy_int(srv->tmp_buf, qlen);
 329
 330                                 response_header_overwrite(srv, con, CONST_STR_LEN("Content-Length"), CONST_BUF_LEN(srv->tmp_buf));
 331                         }
 332                 }
 333         } else {
 334                 /**
 335                  * the file isn't finished yet, but we have all headers
 336                  *
 337                  * to get keep-alive we either need:
 338                  * - Content-Length: ... (HTTP/1.0 and HTTP/1.0) or
 339                  * - Transfer-Encoding: chunked (HTTP/1.1)
 340                  */
 341
 342                 if (((con->parsed_response & HTTP_CONTENT_LENGTH) == 0) &&
 343                     ((con->response.transfer_encoding & HTTP_TRANSFER_ENCODING_CHUNKED) == 0)) {
 344                         if (con->request.http_version == HTTP_VERSION_1_1) {
 345                                 off_t qlen = chunkqueue_length(con->write_queue);
 346                                 con->response.transfer_encoding = HTTP_TRANSFER_ENCODING_CHUNKED;
 347                                 if (qlen) {
 348                                         /* create initial Transfer-Encoding: chunked segment */
 349                                         buffer *b = srv->tmp_chunk_len;
 350                                         buffer_string_set_length(b, 0);
 351                                         buffer_append_uint_hex(b, (uintmax_t)qlen);
 352                                         buffer_append_string_len(b, CONST_STR_LEN("\r\n"));
 353                                         chunkqueue_prepend_buffer(con->write_queue, b);
 354                                         chunkqueue_append_mem(con->write_queue, CONST_STR_LEN("\r\n"));
 355                                 }
 356                         } else {
 357                                 con->keep_alive = 0;
 358                         }
 359                 }
 360
 361                 /**
 362                  * if the backend sent a Connection: close, follow the wish
 363                  *
 364                  * NOTE: if the backend sent Connection: Keep-Alive, but no Content-Length, we
 365                  * will close the connection. That's fine. We can always decide the close
 366                  * the connection
 367                  *
 368                  * FIXME: to be nice we should remove the Connection: ...
 369                  */
 370                 if (con->parsed_response & HTTP_CONNECTION) {
 371                         /* a subrequest disable keep-alive although the client wanted it */
 372                         if (con->keep_alive && !con->response.keep_alive) {
 373                                 con->keep_alive = 0;
 374                         }
 375                 }
 376         }
 377
 378         if (con->request.http_method == HTTP_METHOD_HEAD) {
 379                 /**
 380                  * a HEAD request has the same as a GET
 381                  * without the content
 382                  */
 383                 con->file_finished = 1;
 384
 385                 chunkqueue_reset(con->write_queue);
 386                 con->response.transfer_encoding &= ~HTTP_TRANSFER_ENCODING_CHUNKED;
 387         }
 388
 389         http_response_write_header(srv, con);
 390
 391         return 0;
 392 }
 393
 394 static int connection_handle_write(server *srv, connection *con) {
 395         switch(network_write_chunkqueue(srv, con, con->write_queue, MAX_WRITE_LIMIT)) {
 396         case 0:
 397                 con->write_request_ts = srv->cur_ts;
 398                 if (con->file_finished) {
 399                         connection_set_state(srv, con, CON_STATE_RESPONSE_END);
 400                 }
 401                 break;
 402         case -1: /* error on our side */
 403                 log_error_write(srv, __FILE__, __LINE__, "sd",
 404                                 "connection closed: write failed on fd", con->fd);
 405                 connection_set_state(srv, con, CON_STATE_ERROR);
 406                 break;
 407         case -2: /* remote close */
 408                 connection_set_state(srv, con, CON_STATE_ERROR);
 409                 break;
 410         case 1:
 411                 con->write_request_ts = srv->cur_ts;
 412                 con->is_writable = 0;
 413
 414                 /* not finished yet -> WRITE */
 415                 break;
 416         }
 417
 418         return 0;
 419 }
 420
 421
 422
 423 connection *connection_init(server *srv) {
 424         connection *con;
 425
 426         UNUSED(srv);
 427
 428         con = calloc(1, sizeof(*con));
 429         force_assert(NULL != con);
 430
 431         con->fd = 0;
 432         con->ndx = -1;
 433         con->fde_ndx = -1;
 434         con->bytes_written = 0;
 435         con->bytes_read = 0;
 436         con->bytes_header = 0;
 437         con->loops_per_request = 0;
 438
 439 #define CLEAN(x) \
 440         con->x = buffer_init();
 441
 442         CLEAN(request.uri);
 443         CLEAN(request.request_line);
 444         CLEAN(request.request);
 445         CLEAN(request.pathinfo);
 446
 447         CLEAN(request.orig_uri);
 448
 449         CLEAN(uri.scheme);
 450         CLEAN(uri.authority);
 451         CLEAN(uri.path);
 452         CLEAN(uri.path_raw);
 453         CLEAN(uri.query);
 454
 455         CLEAN(physical.doc_root);
 456         CLEAN(physical.path);
 457         CLEAN(physical.basedir);
 458         CLEAN(physical.rel_path);
 459         CLEAN(physical.etag);
 460         CLEAN(parse_request);
 461
 462         CLEAN(server_name);
 463         CLEAN(dst_addr_buf);
 464 #if defined USE_OPENSSL && ! defined OPENSSL_NO_TLSEXT
 465         CLEAN(tlsext_server_name);
 466 #endif
 467
 468 #undef CLEAN
 469         con->write_queue = chunkqueue_init();
 470         con->read_queue = chunkqueue_init();
 471         con->request_content_queue = chunkqueue_init();
 472         chunkqueue_set_tempdirs(
 473                 con->request_content_queue,
 474                 srv->srvconf.upload_tempdirs,
 475                 srv->srvconf.upload_temp_file_size);
 476
 477         con->request.headers      = array_init();
 478         con->response.headers     = array_init();
 479         con->environment     = array_init();
 480
 481         /* init plugin specific connection structures */
 482
 483         con->plugin_ctx = calloc(1, (srv->plugins.used + 1) * sizeof(void *));
 484         force_assert(NULL != con->plugin_ctx);
 485
 486         con->cond_cache = calloc(srv->config_context->used, sizeof(cond_cache_t));
 487         force_assert(NULL != con->cond_cache);
 488         config_setup_connection(srv, con);
 489
 490         return con;
 491 }
 492
 493 void connections_free(server *srv) {
 494         connections *conns = srv->conns;
 495         size_t i;
 496
 497         for (i = 0; i < conns->size; i++) {
 498                 connection *con = conns->ptr[i];
 499
 500                 connection_reset(srv, con);
 501
 502                 chunkqueue_free(con->write_queue);
 503                 chunkqueue_free(con->read_queue);
 504                 chunkqueue_free(con->request_content_queue);
 505                 array_free(con->request.headers);
 506                 array_free(con->response.headers);
 507                 array_free(con->environment);
 508
 509 #define CLEAN(x) \
 510         buffer_free(con->x);
 511
 512                 CLEAN(request.uri);
 513                 CLEAN(request.request_line);
 514                 CLEAN(request.request);
 515                 CLEAN(request.pathinfo);
 516
 517                 CLEAN(request.orig_uri);
 518
 519                 CLEAN(uri.scheme);
 520                 CLEAN(uri.authority);
 521                 CLEAN(uri.path);
 522                 CLEAN(uri.path_raw);
 523                 CLEAN(uri.query);
 524
 525                 CLEAN(physical.doc_root);
 526                 CLEAN(physical.path);
 527                 CLEAN(physical.basedir);
 528                 CLEAN(physical.etag);
 529                 CLEAN(physical.rel_path);
 530                 CLEAN(parse_request);
 531
 532                 CLEAN(server_name);
 533                 CLEAN(dst_addr_buf);
 534 #if defined USE_OPENSSL && ! defined OPENSSL_NO_TLSEXT
 535                 CLEAN(tlsext_server_name);
 536 #endif
 537 #undef CLEAN
 538                 free(con->plugin_ctx);
 539                 free(con->cond_cache);
 540
 541                 free(con);
 542         }
 543
 544         free(conns->ptr);
 545 }
 546
 547
 548 int connection_reset(server *srv, connection *con) {
 549         size_t i;
 550
 551         plugins_call_connection_reset(srv, con);
 552
 553         con->is_readable = 1;
 554         con->is_writable = 1;
 555         con->http_status = 0;
 556         con->file_finished = 0;
 557         con->file_started = 0;
 558         con->got_response = 0;
 559
 560         con->parsed_response = 0;
 561
 562         con->bytes_written = 0;
 563         con->bytes_written_cur_second = 0;
 564         con->bytes_read = 0;
 565         con->bytes_header = 0;
 566         con->loops_per_request = 0;
 567
 568         con->request.http_method = HTTP_METHOD_UNSET;
 569         con->request.http_version = HTTP_VERSION_UNSET;
 570
 571         con->request.http_if_modified_since = NULL;
 572         con->request.http_if_none_match = NULL;
 573
 574         con->response.keep_alive = 0;
 575         con->response.content_length = -1;
 576         con->response.transfer_encoding = 0;
 577
 578         con->mode = DIRECT;
 579
 580 #define CLEAN(x) \
 581         if (con->x) buffer_reset(con->x);
 582
 583         CLEAN(request.uri);
 584         CLEAN(request.request_line);
 585         CLEAN(request.pathinfo);
 586         CLEAN(request.request);
 587
 588         /* CLEAN(request.orig_uri); */
 589
 590         CLEAN(uri.scheme);
 591         /* CLEAN(uri.authority); */
 592         /* CLEAN(uri.path); */
 593         CLEAN(uri.path_raw);
 594         /* CLEAN(uri.query); */
 595
 596         CLEAN(physical.doc_root);
 597         CLEAN(physical.path);
 598         CLEAN(physical.basedir);
 599         CLEAN(physical.rel_path);
 600         CLEAN(physical.etag);
 601
 602         CLEAN(parse_request);
 603
 604         CLEAN(server_name);
 605 #if defined USE_OPENSSL && ! defined OPENSSL_NO_TLSEXT
 606         CLEAN(tlsext_server_name);
 607 #endif
 608 #undef CLEAN
 609
 610 #define CLEAN(x) \
 611         if (con->x) con->x->used = 0;
 612
 613 #undef CLEAN
 614
 615 #define CLEAN(x) \
 616                 con->request.x = NULL;
 617
 618         CLEAN(http_host);
 619         CLEAN(http_range);
 620         CLEAN(http_content_type);
 621 #undef CLEAN
 622         con->request.content_length = 0;
 623
 624         array_reset(con->request.headers);
 625         array_reset(con->response.headers);
 626         array_reset(con->environment);
 627
 628         chunkqueue_reset(con->write_queue);
 629         chunkqueue_reset(con->request_content_queue);
 630
 631         /* the plugins should cleanup themself */
 632         for (i = 0; i < srv->plugins.used; i++) {
 633                 plugin *p = ((plugin **)(srv->plugins.ptr))[i];
 634                 plugin_data *pd = p->data;
 635
 636                 if (!pd) continue;
 637
 638                 if (con->plugin_ctx[pd->id] != NULL) {
 639                         log_error_write(srv, __FILE__, __LINE__, "sb", "missing cleanup in", p->name);
 640                 }
 641
 642                 con->plugin_ctx[pd->id] = NULL;
 643         }
 644
 645         /* The cond_cache gets reset in response.c */
 646         /* config_cond_cache_reset(srv, con); */
 647
 648         con->header_len = 0;
 649         con->error_handler_saved_status = 0;
 650         /*con->error_handler_saved_method = HTTP_METHOD_UNSET;*/
 651         /*(error_handler_saved_method value is not valid unless error_handler_saved_status is set)*/
 652
 653         config_setup_connection(srv, con);
 654
 655         return 0;
 656 }
 657
 658 /**
 659  * handle all header and content read
 660  *
 661  * we get called by the state-engine and by the fdevent-handler
 662  */
 663 static int connection_handle_read_state(server *srv, connection *con)  {
 664         chunk *c, *last_chunk;
 665         off_t last_offset;
 666         chunkqueue *cq = con->read_queue;
 667         int is_closed = 0; /* the connection got closed, if we don't have a complete header, -> error */
 668         /* when in CON_STATE_READ: about to receive first byte for a request: */
 669         int is_request_start = chunkqueue_is_empty(cq);
 670
 671         if (con->is_readable) {
 672                 con->read_idle_ts = srv->cur_ts;
 673
 674                 switch(connection_handle_read(srv, con)) {
 675                 case -1:
 676                         return -1;
 677                 case -2:
 678                         is_closed = 1;
 679                         break;
 680                 default:
 681                         break;
 682                 }
 683         }
 684
 685         chunkqueue_remove_finished_chunks(cq);
 686
 687         /* we might have got several packets at once
 688          */
 689
 690         /* update request_start timestamp when first byte of
 691          * next request is received on a keep-alive connection */
 692         if (con->request_count > 1 && is_request_start) con->request_start = srv->cur_ts;
 693
 694                 /* if there is a \r\n\r\n in the chunkqueue
 695                  *
 696                  * scan the chunk-queue twice
 697                  * 1. to find the \r\n\r\n
 698                  * 2. to copy the header-packet
 699                  *
 700                  */
 701
 702                 last_chunk = NULL;
 703                 last_offset = 0;
 704
 705                 for (c = cq->first; c; c = c->next) {
 706                         size_t i;
 707                         size_t len = buffer_string_length(c->mem) - c->offset;
 708                         const char *b = c->mem->ptr + c->offset;
 709
 710                         for (i = 0; i < len; ++i) {
 711                                 char ch = b[i];
 712
 713                                 if ('\r' == ch) {
 714                                         /* chec if \n\r\n follows */
 715                                         size_t j = i+1;
 716                                         chunk *cc = c;
 717                                         const char header_end[] = "\r\n\r\n";
 718                                         int header_end_match_pos = 1;
 719
 720                                         for ( ; cc; cc = cc->next, j = 0 ) {
 721                                                 size_t bblen = buffer_string_length(cc->mem) - cc->offset;
 722                                                 const char *bb = cc->mem->ptr + cc->offset;
 723
 724                                                 for ( ; j < bblen; j++) {
 725                                                         ch = bb[j];
 726
 727                                                         if (ch == header_end[header_end_match_pos]) {
 728                                                                 header_end_match_pos++;
 729                                                                 if (4 == header_end_match_pos) {
 730                                                                         last_chunk = cc;
 731                                                                         last_offset = j+1;
 732                                                                         goto found_header_end;
 733                                                                 }
 734                                                         } else {
 735                                                                 goto reset_search;
 736                                                         }
 737                                                 }
 738                                         }
 739                                 }
 740 reset_search: ;
 741                         }
 742                 }
 743 found_header_end:
 744
 745                 /* found */
 746                 if (last_chunk) {
 747                         buffer_reset(con->request.request);
 748
 749                         for (c = cq->first; c; c = c->next) {
 750                                 size_t len = buffer_string_length(c->mem) - c->offset;
 751
 752                                 if (c == last_chunk) {
 753                                         len = last_offset;
 754                                 }
 755
 756                                 buffer_append_string_len(con->request.request, c->mem->ptr + c->offset, len);
 757                                 c->offset += len;
 758                                 cq->bytes_out += len;
 759
 760                                 if (c == last_chunk) break;
 761                         }
 762
 763                         connection_set_state(srv, con, CON_STATE_REQUEST_END);
 764                 } else if (chunkqueue_length(cq) > 64 * 1024) {
 765                         log_error_write(srv, __FILE__, __LINE__, "s", "oversized request-header -> sending Status 414");
 766
 767                         con->http_status = 414; /* Request-URI too large */
 768                         con->keep_alive = 0;
 769                         connection_set_state(srv, con, CON_STATE_HANDLE_REQUEST);
 770                 } else if (is_closed) {
 771                         /* the connection got closed and we didn't got enough data to leave CON_STATE_READ;
 772                          * the only way is to leave here */
 773                         connection_set_state(srv, con, CON_STATE_ERROR);
 774                 }
 775
 776         chunkqueue_remove_finished_chunks(cq);
 777
 778         return 0;
 779 }
 780
 781 static handler_t connection_handle_fdevent(server *srv, void *context, int revents) {
 782         connection *con = context;
 783
 784         joblist_append(srv, con);
 785
 786         if (con->srv_socket->is_ssl) {
 787                 /* ssl may read and write for both reads and writes */
 788                 if (revents & (FDEVENT_IN | FDEVENT_OUT)) {
 789                         con->is_readable = 1;
 790                         con->is_writable = 1;
 791                 }
 792         } else {
 793                 if (revents & FDEVENT_IN) {
 794                         con->is_readable = 1;
 795                 }
 796                 if (revents & FDEVENT_OUT) {
 797                         con->is_writable = 1;
 798                         /* we don't need the event twice */
 799                 }
 800         }
 801
 802
 803         if (revents & ~(FDEVENT_IN | FDEVENT_OUT)) {
 804                 /* looks like an error */
 805
 806                 /* FIXME: revents = 0x19 still means that we should read from the queue */
 807                 if (revents & FDEVENT_HUP) {
 808                         if (con->state == CON_STATE_CLOSE) {
 809                                 con->close_timeout_ts = srv->cur_ts - (HTTP_LINGER_TIMEOUT+1);
 810                         } else {
 811                                 /* sigio reports the wrong event here
 812                                  *
 813                                  * there was no HUP at all
 814                                  */
 815 #ifdef USE_LINUX_SIGIO
 816                                 if (srv->ev->in_sigio == 1) {
 817                                         log_error_write(srv, __FILE__, __LINE__, "sd",
 818                                                 "connection closed: poll() -> HUP", con->fd);
 819                                 } else {
 820                                         connection_set_state(srv, con, CON_STATE_ERROR);
 821                                 }
 822 #else
 823                                 connection_set_state(srv, con, CON_STATE_ERROR);
 824 #endif
 825
 826                         }
 827                 } else if (revents & FDEVENT_ERR) {
 828                         /* error, connection reset, whatever... we don't want to spam the logfile */
 829 #if 0
 830                         log_error_write(srv, __FILE__, __LINE__, "sd",
 831                                         "connection closed: poll() -> ERR", con->fd);
 832 #endif
 833                         connection_set_state(srv, con, CON_STATE_ERROR);
 834                 } else {
 835                         log_error_write(srv, __FILE__, __LINE__, "sd",
 836                                         "connection closed: poll() -> ???", revents);
 837                 }
 838         }
 839
 840         if (con->state == CON_STATE_READ) {
 841                 connection_handle_read_state(srv, con);
 842         }
 843
 844         if (con->state == CON_STATE_WRITE &&
 845             !chunkqueue_is_empty(con->write_queue) &&
 846             con->is_writable) {
 847
 848                 if (-1 == connection_handle_write(srv, con)) {
 849                         connection_set_state(srv, con, CON_STATE_ERROR);
 850
 851                         log_error_write(srv, __FILE__, __LINE__, "ds",
 852                                         con->fd,
 853                                         "handle write failed.");
 854                 }
 855         }
 856
 857         if (con->state == CON_STATE_CLOSE) {
 858                 /* flush the read buffers */
 859                 int len;
 860                 char buf[1024];
 861
 862                 len = read(con->fd, buf, sizeof(buf));
 863                 if (len == 0 || (len < 0 && errno != EAGAIN && errno != EINTR) ) {
 864                         con->close_timeout_ts = srv->cur_ts - (HTTP_LINGER_TIMEOUT+1);
 865                 }
 866         }
 867
 868         return HANDLER_FINISHED;
 869 }
 870
 871
 872 connection *connection_accept(server *srv, server_socket *srv_socket) {
 873         /* accept everything */
 874
 875         /* search an empty place */
 876         int cnt;
 877         sock_addr cnt_addr;
 878         socklen_t cnt_len;
 879         /* accept it and register the fd */
 880
 881         /**
 882          * check if we can still open a new connections
 883          *
 884          * see #1216
 885          */
 886
 887         if (srv->conns->used >= srv->max_conns) {
 888                 return NULL;
 889         }
 890
 891         cnt_len = sizeof(cnt_addr);
 892
 893         if (-1 == (cnt = accept(srv_socket->fd, (struct sockaddr *) &cnt_addr, &cnt_len))) {
 894                 switch (errno) {
 895                 case EAGAIN:
 896 #if EWOULDBLOCK != EAGAIN
 897                 case EWOULDBLOCK:
 898 #endif
 899                 case EINTR:
 900                         /* we were stopped _before_ we had a connection */
 901                 case ECONNABORTED: /* this is a FreeBSD thingy */
 902                         /* we were stopped _after_ we had a connection */
 903                         break;
 904                 case EMFILE:
 905                         /* out of fds */
 906                         break;
 907                 default:
 908                         log_error_write(srv, __FILE__, __LINE__, "ssd", "accept failed:", strerror(errno), errno);
 909                 }
 910                 return NULL;
 911         } else {
 912                 if (cnt_addr.plain.sa_family != AF_UNIX) {
 913                         network_accept_tcp_nagle_disable(cnt);
 914                 }
 915                 return connection_accepted(srv, srv_socket, &cnt_addr, cnt);
 916         }
 917 }
 918
 919 connection *connection_accepted(server *srv, server_socket *srv_socket, sock_addr *cnt_addr, int cnt) {
 920                 connection *con;
 921
 922                 srv->cur_fds++;
 923
 924                 /* ok, we have the connection, register it */
 925 #if 0
 926                 log_error_write(srv, __FILE__, __LINE__, "sd",
 927                                 "appected()", cnt);
 928 #endif
 929                 srv->con_opened++;
 930
 931                 con = connections_get_new_connection(srv);
 932
 933                 con->fd = cnt;
 934                 con->fde_ndx = -1;
 935 #if 0
 936                 gettimeofday(&(con->start_tv), NULL);
 937 #endif
 938                 fdevent_register(srv->ev, con->fd, connection_handle_fdevent, con);
 939
 940                 connection_set_state(srv, con, CON_STATE_REQUEST_START);
 941
 942                 con->connection_start = srv->cur_ts;
 943                 con->dst_addr = *cnt_addr;
 944                 buffer_copy_string(con->dst_addr_buf, inet_ntop_cache_get_ip(srv, &(con->dst_addr)));
 945                 con->srv_socket = srv_socket;
 946
 947                 if (-1 == (fdevent_fcntl_set(srv->ev, con->fd))) {
 948                         log_error_write(srv, __FILE__, __LINE__, "ss", "fcntl failed: ", strerror(errno));
 949                         return NULL;
 950                 }
 951 #ifdef USE_OPENSSL
 952                 /* connect FD to SSL */
 953                 if (srv_socket->is_ssl) {
 954                         if (NULL == (con->ssl = SSL_new(srv_socket->ssl_ctx))) {
 955                                 log_error_write(srv, __FILE__, __LINE__, "ss", "SSL:",
 956                                                 ERR_error_string(ERR_get_error(), NULL));
 957
 958                                 return NULL;
 959                         }
 960
 961                         con->renegotiations = 0;
 962                         SSL_set_app_data(con->ssl, con);
 963                         SSL_set_accept_state(con->ssl);
 964
 965                         if (1 != (SSL_set_fd(con->ssl, cnt))) {
 966                                 log_error_write(srv, __FILE__, __LINE__, "ss", "SSL:",
 967                                                 ERR_error_string(ERR_get_error(), NULL));
 968                                 return NULL;
 969                         }
 970                 }
 971 #endif
 972                 return con;
 973 }
 974
 975
 976 int connection_state_machine(server *srv, connection *con) {
 977         int done = 0, r;
 978 #ifdef USE_OPENSSL
 979         server_socket *srv_sock = con->srv_socket;
 980 #endif
 981
 982         if (srv->srvconf.log_state_handling) {
 983                 log_error_write(srv, __FILE__, __LINE__, "sds",
 984                                 "state at start",
 985                                 con->fd,
 986                                 connection_get_state(con->state));
 987         }
 988
 989         while (done == 0) {
 990                 size_t ostate = con->state;
 991
 992                 switch (con->state) {
 993                 case CON_STATE_REQUEST_START: /* transient */
 994                         if (srv->srvconf.log_state_handling) {
 995                                 log_error_write(srv, __FILE__, __LINE__, "sds",
 996                                                 "state for fd", con->fd, connection_get_state(con->state));
 997                         }
 998
 999                         con->request_start = srv->cur_ts;
1000                         con->read_idle_ts = srv->cur_ts;
1001
1002                         con->request_count++;
1003                         con->loops_per_request = 0;
1004
1005                         connection_set_state(srv, con, CON_STATE_READ);
1006
1007                         break;
1008                 case CON_STATE_REQUEST_END: /* transient */
1009                         if (srv->srvconf.log_state_handling) {
1010                                 log_error_write(srv, __FILE__, __LINE__, "sds",
1011                                                 "state for fd", con->fd, connection_get_state(con->state));
1012                         }
1013
1014                         buffer_reset(con->uri.authority);
1015                         buffer_reset(con->uri.path);
1016                         buffer_reset(con->uri.query);
1017                         buffer_reset(con->request.orig_uri);
1018
1019                         if (http_request_parse(srv, con)) {
1020                                 /* we have to read some data from the POST request */
1021
1022                                 connection_set_state(srv, con, CON_STATE_READ_POST);
1023
1024                                 break;
1025                         }
1026
1027                         connection_set_state(srv, con, CON_STATE_HANDLE_REQUEST);
1028
1029                         break;
1030                 case CON_STATE_READ_POST:
1031                 case CON_STATE_HANDLE_REQUEST:
1032                         /*
1033                          * the request is parsed
1034                          *
1035                          * decided what to do with the request
1036                          * -
1037                          *
1038                          *
1039                          */
1040
1041                         if (srv->srvconf.log_state_handling) {
1042                                 log_error_write(srv, __FILE__, __LINE__, "sds",
1043                                                 "state for fd", con->fd, connection_get_state(con->state));
1044                         }
1045
1046                         switch (r = http_response_prepare(srv, con)) {
1047                         case HANDLER_WAIT_FOR_EVENT:
1048                                 if (!con->file_finished && (!con->file_started || 0 == con->conf.stream_response_body)) {
1049                                         break; /* come back here */
1050                                 }
1051                                 /* response headers received from backend; fall through to start response */
1052                         case HANDLER_FINISHED:
1053                                 if (con->error_handler_saved_status > 0) {
1054                                         con->request.http_method = con->error_handler_saved_method;
1055                                 }
1056                                 if (con->mode == DIRECT) {
1057                                         if (con->error_handler_saved_status) {
1058                                                 if (con->error_handler_saved_status > 0) {
1059                                                         con->http_status = con->error_handler_saved_status;
1060                                                 } else if (con->http_status == 404 || con->http_status == 403) {
1061                                                         /* error-handler-404 is a 404 */
1062                                                         con->http_status = -con->error_handler_saved_status;
1063                                                 } else {
1064                                                         /* error-handler-404 is back and has generated content */
1065                                                         /* if Status: was set, take it otherwise use 200 */
1066                                                 }
1067                                         } else if (con->http_status >= 400) {
1068                                                 buffer *error_handler = NULL;
1069                                                 if (!buffer_string_is_empty(con->conf.error_handler)) {
1070                                                         error_handler = con->conf.error_handler;
1071                                                 } else if ((con->http_status == 404 || con->http_status == 403)
1072                                                            && !buffer_string_is_empty(con->conf.error_handler_404)) {
1073                                                         error_handler = con->conf.error_handler_404;
1074                                                 }
1075
1076                                                 if (error_handler) {
1077                                                         /* call error-handler */
1078
1079                                                         /* set REDIRECT_STATUS to save current HTTP status code
1080                                                          * for access by dynamic handlers
1081                                                          * https://redmine.lighttpd.net/issues/1828 */
1082                                                         data_string *ds;
1083                                                         if (NULL == (ds = (data_string *)array_get_unused_element(con->environment, TYPE_STRING))) {
1084                                                                 ds = data_string_init();
1085                                                         }
1086                                                         buffer_copy_string_len(ds->key, CONST_STR_LEN("REDIRECT_STATUS"));
1087                                                         buffer_append_int(ds->value, con->http_status);
1088                                                         array_insert_unique(con->environment, (data_unset *)ds);
1089
1090                                                         if (error_handler == con->conf.error_handler) {
1091                                                                 plugins_call_connection_reset(srv, con);
1092
1093                                                                 if (con->request.content_length) {
1094                                                                         if ((off_t)con->request.content_length != chunkqueue_length(con->request_content_queue)) {
1095                                                                                 con->keep_alive = 0;
1096                                                                         }
1097                                                                         con->request.content_length = 0;
1098                                                                         chunkqueue_reset(con->request_content_queue);
1099                                                                 }
1100
1101                                                                 con->is_writable = 1;
1102                                                                 con->file_finished = 0;
1103                                                                 con->file_started = 0;
1104                                                                 con->got_response = 0;
1105                                                                 con->parsed_response = 0;
1106                                                                 con->response.keep_alive = 0;
1107                                                                 con->response.content_length = -1;
1108                                                                 con->response.transfer_encoding = 0;
1109
1110                                                                 array_set_key_value(con->environment, CONST_STR_LEN("REDIRECT_URI"), CONST_BUF_LEN(con->request.orig_uri));
1111                                                                 con->error_handler_saved_status = con->http_status;
1112                                                                 con->error_handler_saved_method = con->request.http_method;
1113
1114                                                                 con->request.http_method = HTTP_METHOD_GET;
1115                                                         } else { /*(preserve behavior for server.error-handler-404)*/
1116                                                                 array_set_key_value(con->environment, CONST_STR_LEN("REDIRECT_URI"), CONST_BUF_LEN(error_handler));
1117                                                                 con->error_handler_saved_status = -con->http_status; /*(negative to flag old behavior)*/
1118                                                         }
1119
1120                                                         buffer_copy_buffer(con->request.uri, error_handler);
1121                                                         connection_handle_errdoc_init(srv, con);
1122                                                         con->http_status = 0; /*(after connection_handle_errdoc_init())*/
1123
1124                                                         done = -1;
1125                                                         break;
1126                                                 }
1127                                         }
1128                                 }
1129                                 if (con->http_status == 0) con->http_status = 200;
1130
1131                                 /* we have something to send, go on */
1132                                 connection_set_state(srv, con, CON_STATE_RESPONSE_START);
1133                                 break;
1134                         case HANDLER_WAIT_FOR_FD:
1135                                 srv->want_fds++;
1136
1137                                 fdwaitqueue_append(srv, con);
1138
1139                                 break;
1140                         case HANDLER_COMEBACK:
1141                                 done = -1;
1142                                 break;
1143                         case HANDLER_ERROR:
1144                                 /* something went wrong */
1145                                 connection_set_state(srv, con, CON_STATE_ERROR);
1146                                 break;
1147                         default:
1148                                 log_error_write(srv, __FILE__, __LINE__, "sdd", "unknown ret-value: ", con->fd, r);
1149                                 break;
1150                         }
1151
1152                         break;
1153                 case CON_STATE_RESPONSE_START:
1154                         /*
1155                          * the decision is done
1156                          * - create the HTTP-Response-Header
1157                          *
1158                          */
1159
1160                         if (srv->srvconf.log_state_handling) {
1161                                 log_error_write(srv, __FILE__, __LINE__, "sds",
1162                                                 "state for fd", con->fd, connection_get_state(con->state));
1163                         }
1164
1165                         if (-1 == connection_handle_write_prepare(srv, con)) {
1166                                 connection_set_state(srv, con, CON_STATE_ERROR);
1167
1168                                 break;
1169                         }
1170
1171                         connection_set_state(srv, con, CON_STATE_WRITE);
1172                         break;
1173                 case CON_STATE_RESPONSE_END: /* transient */
1174                         /* log the request */
1175
1176                         if (srv->srvconf.log_state_handling) {
1177                                 log_error_write(srv, __FILE__, __LINE__, "sds",
1178                                                 "state for fd", con->fd, connection_get_state(con->state));
1179                         }
1180
1181                         if (con->request.content_length
1182                             && (off_t)con->request.content_length > con->request_content_queue->bytes_in) {
1183                                 /* request body is present and has not been read completely */
1184                                 con->keep_alive = 0;
1185                         }
1186
1187                         plugins_call_handle_request_done(srv, con);
1188
1189                         srv->con_written++;
1190
1191                         if (con->keep_alive) {
1192                                 connection_set_state(srv, con, CON_STATE_REQUEST_START);
1193
1194 #if 0
1195                                 con->request_start = srv->cur_ts;
1196                                 con->read_idle_ts = srv->cur_ts;
1197 #endif
1198                         } else {
1199                                 switch(r = plugins_call_handle_connection_close(srv, con)) {
1200                                 case HANDLER_GO_ON:
1201                                 case HANDLER_FINISHED:
1202                                         break;
1203                                 default:
1204                                         log_error_write(srv, __FILE__, __LINE__, "sd", "unhandling return value", r);
1205                                         break;
1206                                 }
1207
1208 #ifdef USE_OPENSSL
1209                                 if (srv_sock->is_ssl) {
1210                                         switch (SSL_shutdown(con->ssl)) {
1211                                         case 1:
1212                                                 /* done */
1213                                                 break;
1214                                         case 0:
1215                                                 /* wait for fd-event
1216                                                  *
1217                                                  * FIXME: wait for fdevent and call SSL_shutdown again
1218                                                  *
1219                                                  */
1220
1221                                                 break;
1222                                         default:
1223                                                 log_error_write(srv, __FILE__, __LINE__, "ss", "SSL:",
1224                                                                 ERR_error_string(ERR_get_error(), NULL));
1225                                         }
1226                                 }
1227 #endif
1228                                 if ((0 == shutdown(con->fd, SHUT_WR))) {
1229                                         con->close_timeout_ts = srv->cur_ts;
1230                                         connection_set_state(srv, con, CON_STATE_CLOSE);
1231                                 } else {
1232                                         connection_close(srv, con);
1233                                 }
1234
1235                                 srv->con_closed++;
1236                         }
1237
1238                         connection_reset(srv, con);
1239
1240                         break;
1241                 case CON_STATE_CONNECT:
1242                         if (srv->srvconf.log_state_handling) {
1243                                 log_error_write(srv, __FILE__, __LINE__, "sds",
1244                                                 "state for fd", con->fd, connection_get_state(con->state));
1245                         }
1246
1247                         chunkqueue_reset(con->read_queue);
1248
1249                         con->request_count = 0;
1250
1251                         break;
1252                 case CON_STATE_CLOSE:
1253                         if (srv->srvconf.log_state_handling) {
1254                                 log_error_write(srv, __FILE__, __LINE__, "sds",
1255                                                 "state for fd", con->fd, connection_get_state(con->state));
1256                         }
1257
1258                         /* we have to do the linger_on_close stuff regardless
1259                          * of con->keep_alive; even non-keepalive sockets may
1260                          * still have unread data, and closing before reading
1261                          * it will make the client not see all our output.
1262                          */
1263                         {
1264                                 int len;
1265                                 char buf[1024];
1266
1267                                 len = read(con->fd, buf, sizeof(buf));
1268                                 if (len == 0 || (len < 0 && errno != EAGAIN && errno != EINTR) ) {
1269                                         con->close_timeout_ts = srv->cur_ts - (HTTP_LINGER_TIMEOUT+1);
1270                                 }
1271                         }
1272
1273                         if (srv->cur_ts - con->close_timeout_ts > HTTP_LINGER_TIMEOUT) {
1274                                 connection_close(srv, con);
1275
1276                                 if (srv->srvconf.log_state_handling) {
1277                                         log_error_write(srv, __FILE__, __LINE__, "sd",
1278                                                         "connection closed for fd", con->fd);
1279                                 }
1280                         }
1281
1282                         break;
1283                 case CON_STATE_READ:
1284                         if (srv->srvconf.log_state_handling) {
1285                                 log_error_write(srv, __FILE__, __LINE__, "sds",
1286                                                 "state for fd", con->fd, connection_get_state(con->state));
1287                         }
1288
1289                         connection_handle_read_state(srv, con);
1290                         break;
1291                 case CON_STATE_WRITE:
1292                         if (srv->srvconf.log_state_handling) {
1293                                 log_error_write(srv, __FILE__, __LINE__, "sds",
1294                                                 "state for fd", con->fd, connection_get_state(con->state));
1295                         }
1296
1297                         do {
1298                                 /* only try to write if we have something in the queue */
1299                                 if (!chunkqueue_is_empty(con->write_queue)) {
1300                                         if (con->is_writable) {
1301                                                 if (-1 == connection_handle_write(srv, con)) {
1302                                                         log_error_write(srv, __FILE__, __LINE__, "ds",
1303                                                                         con->fd,
1304                                                                         "handle write failed.");
1305                                                         connection_set_state(srv, con, CON_STATE_ERROR);
1306                                                         break;
1307                                                 }
1308                                                 if (con->state != CON_STATE_WRITE) break;
1309                                         }
1310                                 } else if (con->file_finished) {
1311                                         connection_set_state(srv, con, CON_STATE_RESPONSE_END);
1312                                         break;
1313                                 }
1314
1315                                 if (con->mode != DIRECT && !con->file_finished) {
1316                                         switch(r = plugins_call_handle_subrequest(srv, con)) {
1317                                         case HANDLER_WAIT_FOR_EVENT:
1318                                         case HANDLER_FINISHED:
1319                                         case HANDLER_GO_ON:
1320                                                 break;
1321                                         case HANDLER_WAIT_FOR_FD:
1322                                                 srv->want_fds++;
1323                                                 fdwaitqueue_append(srv, con);
1324                                                 break;
1325                                         case HANDLER_COMEBACK:
1326                                         default:
1327                                                 log_error_write(srv, __FILE__, __LINE__, "sdd", "unexpected subrequest handler ret-value: ", con->fd, r);
1328                                                 /* fall through */
1329                                         case HANDLER_ERROR:
1330                                                 connection_set_state(srv, con, CON_STATE_ERROR);
1331                                                 break;
1332                                         }
1333                                 }
1334                         } while (con->state == CON_STATE_WRITE && (!chunkqueue_is_empty(con->write_queue) ? con->is_writable : con->file_finished));
1335
1336                         break;
1337                 case CON_STATE_ERROR: /* transient */
1338
1339                         /* even if the connection was drop we still have to write it to the access log */
1340                         if (con->http_status) {
1341                                 plugins_call_handle_request_done(srv, con);
1342                         }
1343 #ifdef USE_OPENSSL
1344                         if (srv_sock->is_ssl) {
1345                                 int ret, ssl_r;
1346                                 unsigned long err;
1347                                 ERR_clear_error();
1348                                 switch ((ret = SSL_shutdown(con->ssl))) {
1349                                 case 1:
1350                                         /* ok */
1351                                         break;
1352                                 case 0:
1353                                         ERR_clear_error();
1354                                         if (-1 != (ret = SSL_shutdown(con->ssl))) break;
1355
1356                                         /* fall through */
1357                                 default:
1358
1359                                         switch ((ssl_r = SSL_get_error(con->ssl, ret))) {
1360                                         case SSL_ERROR_WANT_WRITE:
1361                                         case SSL_ERROR_WANT_READ:
1362                                                 break;
1363                                         case SSL_ERROR_SYSCALL:
1364                                                 /* perhaps we have error waiting in our error-queue */
1365                                                 if (0 != (err = ERR_get_error())) {
1366                                                         do {
1367                                                                 log_error_write(srv, __FILE__, __LINE__, "sdds", "SSL:",
1368                                                                                 ssl_r, ret,
1369                                                                                 ERR_error_string(err, NULL));
1370                                                         } while((err = ERR_get_error()));
1371                                                 } else if (errno != 0) { /* ssl bug (see lighttpd ticket #2213): sometimes errno == 0 */
1372                                                         switch(errno) {
1373                                                         case EPIPE:
1374                                                         case ECONNRESET:
1375                                                                 break;
1376                                                         default:
1377                                                                 log_error_write(srv, __FILE__, __LINE__, "sddds", "SSL (error):",
1378                                                                         ssl_r, ret, errno,
1379                                                                         strerror(errno));
1380                                                                 break;
1381                                                         }
1382                                                 }
1383
1384                                                 break;
1385                                         default:
1386                                                 while((err = ERR_get_error())) {
1387                                                         log_error_write(srv, __FILE__, __LINE__, "sdds", "SSL:",
1388                                                                         ssl_r, ret,
1389                                                                         ERR_error_string(err, NULL));
1390                                                 }
1391
1392                                                 break;
1393                                         }
1394                                 }
1395                                 ERR_clear_error();
1396                         }
1397 #endif
1398
1399                         switch(con->mode) {
1400                         case DIRECT:
1401 #if 0
1402                                 log_error_write(srv, __FILE__, __LINE__, "sd",
1403                                                 "emergency exit: direct",
1404                                                 con->fd);
1405 #endif
1406                                 break;
1407                         default:
1408                                 switch(r = plugins_call_handle_connection_close(srv, con)) {
1409                                 case HANDLER_GO_ON:
1410                                 case HANDLER_FINISHED:
1411                                         break;
1412                                 default:
1413                                         log_error_write(srv, __FILE__, __LINE__, "sd", "unhandling return value", r);
1414                                         break;
1415                                 }
1416                                 break;
1417                         }
1418
1419                         connection_reset(srv, con);
1420
1421                         /* close the connection */
1422                         if ((0 == shutdown(con->fd, SHUT_WR))) {
1423                                 con->close_timeout_ts = srv->cur_ts;
1424                                 connection_set_state(srv, con, CON_STATE_CLOSE);
1425
1426                                 if (srv->srvconf.log_state_handling) {
1427                                         log_error_write(srv, __FILE__, __LINE__, "sd",
1428                                                         "shutdown for fd", con->fd);
1429                                 }
1430                         } else {
1431                                 connection_close(srv, con);
1432                         }
1433
1434                         con->keep_alive = 0;
1435
1436                         srv->con_closed++;
1437
1438                         break;
1439                 default:
1440                         log_error_write(srv, __FILE__, __LINE__, "sdd",
1441                                         "unknown state:", con->fd, con->state);
1442
1443                         break;
1444                 }
1445
1446                 if (done == -1) {
1447                         done = 0;
1448                 } else if (ostate == con->state) {
1449                         done = 1;
1450                 }
1451         }
1452
1453         if (srv->srvconf.log_state_handling) {
1454                 log_error_write(srv, __FILE__, __LINE__, "sds",
1455                                 "state at exit:",
1456                                 con->fd,
1457                                 connection_get_state(con->state));
1458         }
1459
1460         r = 0;
1461         switch(con->state) {
1462         case CON_STATE_READ:
1463         case CON_STATE_CLOSE:
1464                 r = FDEVENT_IN;
1465                 break;
1466         case CON_STATE_WRITE:
1467                 /* request write-fdevent only if we really need it
1468                  * - if we have data to write
1469                  * - if the socket is not writable yet
1470                  */
1471                 if (!chunkqueue_is_empty(con->write_queue) &&
1472                     (con->is_writable == 0) &&
1473                     (con->traffic_limit_reached == 0)) {
1474                         r |= FDEVENT_OUT;
1475                 }
1476                 /* fall through */
1477         case CON_STATE_READ_POST:
1478                 if (con->conf.stream_request_body & FDEVENT_STREAM_REQUEST_POLLIN) {
1479                         r |= FDEVENT_IN;
1480                 }
1481                 break;
1482         default:
1483                 break;
1484         }
1485         if (-1 != con->fd) {
1486                 const int events = fdevent_event_get_interest(srv->ev, con->fd);
1487                 if (r != events) {
1488                         /* update timestamps when enabling interest in events */
1489                         if ((r & FDEVENT_IN) && !(events & FDEVENT_IN)) {
1490                                 con->read_idle_ts = srv->cur_ts;
1491                         }
1492                         if ((r & FDEVENT_OUT) && !(events & FDEVENT_OUT)) {
1493                                 con->write_request_ts = srv->cur_ts;
1494                         }
1495                         fdevent_event_set(srv->ev, &con->fde_ndx, con->fd, r);
1496                 }
1497         }
1498
1499         return 0;
1500 }