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