src/network.c

   1 #include "first.h"
   2
   3 #include "network.h"
   4 #include "fdevent.h"
   5 #include "log.h"
   6 #include "connections.h"
   7 #include "plugin.h"
   8 #include "joblist.h"
   9 #include "configfile.h"
  10
  11 #include "network_backends.h"
  12 #include "sys-mmap.h"
  13 #include "sys-socket.h"
  14
  15 #include <sys/types.h>
  16 #include <sys/stat.h>
  17 #include <sys/time.h>
  18
  19 #include <errno.h>
  20 #include <fcntl.h>
  21 #include <unistd.h>
  22 #include <string.h>
  23 #include <stdlib.h>
  24 #include <assert.h>
  25
  26 #ifdef USE_OPENSSL
  27 # include <openssl/ssl.h>
  28 # include <openssl/err.h>
  29 # include <openssl/rand.h>
  30 # ifndef OPENSSL_NO_DH
  31 #  include <openssl/dh.h>
  32 # endif
  33 # include <openssl/bn.h>
  34
  35 # if OPENSSL_VERSION_NUMBER >= 0x0090800fL
  36 #  ifndef OPENSSL_NO_ECDH
  37 # include <openssl/ecdh.h>
  38 #  endif
  39 # endif
  40 #endif
  41
  42 #ifdef USE_OPENSSL
  43 static void ssl_info_callback(const SSL *ssl, int where, int ret) {
  44         UNUSED(ret);
  45
  46         if (0 != (where & SSL_CB_HANDSHAKE_START)) {
  47                 connection *con = SSL_get_app_data(ssl);
  48                 ++con->renegotiations;
  49         }
  50 }
  51 #endif
  52
  53 void
  54 network_accept_tcp_nagle_disable (const int fd)
  55 {
  56     static int noinherit_tcpnodelay = -1;
  57     int opt;
  58
  59     if (!noinherit_tcpnodelay) /* TCP_NODELAY inherited from listen socket */
  60         return;
  61
  62     if (noinherit_tcpnodelay < 0) {
  63         socklen_t optlen = sizeof(opt);
  64         if (0 == getsockopt(fd, IPPROTO_TCP, TCP_NODELAY, &opt, &optlen)) {
  65             noinherit_tcpnodelay = !opt;
  66             if (opt)           /* TCP_NODELAY inherited from listen socket */
  67                 return;
  68         }
  69     }
  70
  71     opt = 1;
  72     (void)setsockopt(fd, IPPROTO_TCP, TCP_NODELAY, &opt, sizeof(opt));
  73 }
  74
  75 static handler_t network_server_handle_fdevent(server *srv, void *context, int revents) {
  76         server_socket *srv_socket = (server_socket *)context;
  77         connection *con;
  78         int loops = 0;
  79
  80         UNUSED(context);
  81
  82         if (0 == (revents & FDEVENT_IN)) {
  83                 log_error_write(srv, __FILE__, __LINE__, "sdd",
  84                                 "strange event for server socket",
  85                                 srv_socket->fd,
  86                                 revents);
  87                 return HANDLER_ERROR;
  88         }
  89
  90         /* accept()s at most 100 connections directly
  91          *
  92          * we jump out after 100 to give the waiting connections a chance */
  93         for (loops = 0; loops < 100 && NULL != (con = connection_accept(srv, srv_socket)); loops++) {
  94                 connection_state_machine(srv, con);
  95         }
  96         return HANDLER_GO_ON;
  97 }
  98
  99 #if defined USE_OPENSSL && ! defined OPENSSL_NO_TLSEXT
 100 static int network_ssl_servername_callback(SSL *ssl, int *al, server *srv) {
 101         const char *servername;
 102         connection *con = (connection *) SSL_get_app_data(ssl);
 103         UNUSED(al);
 104
 105         buffer_copy_string(con->uri.scheme, "https");
 106
 107         if (NULL == (servername = SSL_get_servername(ssl, TLSEXT_NAMETYPE_host_name))) {
 108 #if 0
 109                 /* this "error" just means the client didn't support it */
 110                 log_error_write(srv, __FILE__, __LINE__, "ss", "SSL:",
 111                                 "failed to get TLS server name");
 112 #endif
 113                 return SSL_TLSEXT_ERR_NOACK;
 114         }
 115         buffer_copy_string(con->tlsext_server_name, servername);
 116         buffer_to_lower(con->tlsext_server_name);
 117
 118         /* Sometimes this is still set, confusing COMP_HTTP_HOST */
 119         buffer_reset(con->uri.authority);
 120
 121         config_cond_cache_reset(srv, con);
 122         config_setup_connection(srv, con);
 123
 124         con->conditional_is_valid[COMP_SERVER_SOCKET] = 1;
 125         con->conditional_is_valid[COMP_HTTP_SCHEME] = 1;
 126         con->conditional_is_valid[COMP_HTTP_HOST] = 1;
 127         config_patch_connection(srv, con);
 128
 129         if (NULL == con->conf.ssl_pemfile_x509 || NULL == con->conf.ssl_pemfile_pkey) {
 130                 /* x509/pkey available <=> pemfile was set <=> pemfile got patched: so this should never happen, unless you nest $SERVER["socket"] */
 131                 log_error_write(srv, __FILE__, __LINE__, "ssb", "SSL:",
 132                         "no certificate/private key for TLS server name", con->tlsext_server_name);
 133                 return SSL_TLSEXT_ERR_ALERT_FATAL;
 134         }
 135
 136         /* first set certificate! setting private key checks whether certificate matches it */
 137         if (!SSL_use_certificate(ssl, con->conf.ssl_pemfile_x509)) {
 138                 log_error_write(srv, __FILE__, __LINE__, "ssb:s", "SSL:",
 139                         "failed to set certificate for TLS server name", con->tlsext_server_name,
 140                         ERR_error_string(ERR_get_error(), NULL));
 141                 return SSL_TLSEXT_ERR_ALERT_FATAL;
 142         }
 143
 144         if (!SSL_use_PrivateKey(ssl, con->conf.ssl_pemfile_pkey)) {
 145                 log_error_write(srv, __FILE__, __LINE__, "ssb:s", "SSL:",
 146                         "failed to set private key for TLS server name", con->tlsext_server_name,
 147                         ERR_error_string(ERR_get_error(), NULL));
 148                 return SSL_TLSEXT_ERR_ALERT_FATAL;
 149         }
 150
 151         if (con->conf.ssl_verifyclient) {
 152                 if (NULL == con->conf.ssl_ca_file_cert_names) {
 153                         log_error_write(srv, __FILE__, __LINE__, "ssb:s", "SSL:",
 154                                 "can't verify client without ssl.ca-file for TLS server name", con->tlsext_server_name,
 155                                 ERR_error_string(ERR_get_error(), NULL));
 156                         return SSL_TLSEXT_ERR_ALERT_FATAL;
 157                 }
 158
 159                 SSL_set_client_CA_list(ssl, SSL_dup_CA_list(con->conf.ssl_ca_file_cert_names));
 160                 /* forcing verification here is really not that useful - a client could just connect without SNI */
 161                 SSL_set_verify(
 162                         ssl,
 163                         SSL_VERIFY_PEER | (con->conf.ssl_verifyclient_enforce ? SSL_VERIFY_FAIL_IF_NO_PEER_CERT : 0),
 164                         NULL
 165                 );
 166                 SSL_set_verify_depth(ssl, con->conf.ssl_verifyclient_depth);
 167         } else {
 168                 SSL_set_verify(ssl, SSL_VERIFY_NONE, NULL);
 169         }
 170
 171         return SSL_TLSEXT_ERR_OK;
 172 }
 173 #endif
 174
 175 static int network_server_init(server *srv, buffer *host_token, specific_config *s) {
 176         int val;
 177         socklen_t addr_len;
 178         server_socket *srv_socket;
 179         unsigned int port = 0;
 180         const char *host;
 181         buffer *b;
 182         int err;
 183
 184 #ifdef __WIN32
 185         WORD wVersionRequested;
 186         WSADATA wsaData;
 187
 188         wVersionRequested = MAKEWORD( 2, 2 );
 189
 190         err = WSAStartup( wVersionRequested, &wsaData );
 191         if ( err != 0 ) {
 192                     /* Tell the user that we could not find a usable */
 193                     /* WinSock DLL.                                  */
 194                     return -1;
 195         }
 196 #endif
 197         err = -1;
 198
 199         srv_socket = calloc(1, sizeof(*srv_socket));
 200         force_assert(NULL != srv_socket);
 201         srv_socket->addr.plain.sa_family = AF_INET; /* default */
 202         srv_socket->fd = -1;
 203         srv_socket->fde_ndx = -1;
 204
 205         srv_socket->srv_token = buffer_init();
 206         buffer_copy_buffer(srv_socket->srv_token, host_token);
 207
 208         b = buffer_init();
 209         buffer_copy_buffer(b, host_token);
 210
 211         host = b->ptr;
 212
 213         if (host[0] == '/') {
 214                 /* host is a unix-domain-socket */
 215 #ifdef HAVE_SYS_UN_H
 216                 srv_socket->addr.plain.sa_family = AF_UNIX;
 217 #else
 218                 log_error_write(srv, __FILE__, __LINE__, "s",
 219                                 "ERROR: Unix Domain sockets are not supported.");
 220                 goto error_free_socket;
 221 #endif
 222         } else {
 223                 /* ipv4:port
 224                  * [ipv6]:port
 225                  */
 226                 size_t len = buffer_string_length(b);
 227                 char *sp = NULL;
 228                 if (0 == len) {
 229                         log_error_write(srv, __FILE__, __LINE__, "s", "value of $SERVER[\"socket\"] must not be empty");
 230                         goto error_free_socket;
 231                 }
 232                 if ((b->ptr[0] == '[' && b->ptr[len-1] == ']') || NULL == (sp = strrchr(b->ptr, ':'))) {
 233                         /* use server.port if set in config, or else default from config_set_defaults() */
 234                         port = srv->srvconf.port;
 235                         sp = b->ptr + len; /* point to '\0' at end of string so end of IPv6 address can be found below */
 236                 } else {
 237                         /* found ip:port separator at *sp; port doesn't end in ']', so *sp hopefully doesn't split an IPv6 address */
 238                         *sp = '\0';
 239                         port = strtol(sp+1, NULL, 10);
 240                 }
 241
 242                 /* check for [ and ] */
 243                 if (b->ptr[0] == '[' && *(sp-1) == ']') {
 244                         *(sp-1) = '\0';
 245                         host++;
 246
 247                         s->use_ipv6 = 1;
 248                 }
 249
 250                 if (port == 0 || port > 65535) {
 251                         log_error_write(srv, __FILE__, __LINE__, "sd", "port not set or out of range:", port);
 252
 253                         goto error_free_socket;
 254                 }
 255         }
 256
 257         if (*host == '\0') host = NULL;
 258
 259 #ifdef HAVE_IPV6
 260         if (s->use_ipv6) {
 261                 srv_socket->addr.plain.sa_family = AF_INET6;
 262         }
 263 #endif
 264
 265         switch(srv_socket->addr.plain.sa_family) {
 266 #ifdef HAVE_IPV6
 267         case AF_INET6:
 268                 memset(&srv_socket->addr, 0, sizeof(struct sockaddr_in6));
 269                 srv_socket->addr.ipv6.sin6_family = AF_INET6;
 270                 if (host == NULL) {
 271                         srv_socket->addr.ipv6.sin6_addr = in6addr_any;
 272                         log_error_write(srv, __FILE__, __LINE__, "s", "warning: please use server.use-ipv6 only for hostnames, not without server.bind / empty address; your config will break if the kernel default for IPV6_V6ONLY changes");
 273                 } else {
 274                         struct addrinfo hints, *res;
 275                         int r;
 276
 277                         memset(&hints, 0, sizeof(hints));
 278
 279                         hints.ai_family   = AF_INET6;
 280                         hints.ai_socktype = SOCK_STREAM;
 281                         hints.ai_protocol = IPPROTO_TCP;
 282
 283                         if (0 != (r = getaddrinfo(host, NULL, &hints, &res))) {
 284                                 log_error_write(srv, __FILE__, __LINE__,
 285                                                 "sssss", "getaddrinfo failed: ",
 286                                                 gai_strerror(r), "'", host, "'");
 287
 288                                 goto error_free_socket;
 289                         }
 290
 291                         memcpy(&(srv_socket->addr), res->ai_addr, res->ai_addrlen);
 292
 293                         freeaddrinfo(res);
 294                 }
 295                 srv_socket->addr.ipv6.sin6_port = htons(port);
 296                 addr_len = sizeof(struct sockaddr_in6);
 297                 break;
 298 #endif
 299         case AF_INET:
 300                 memset(&srv_socket->addr, 0, sizeof(struct sockaddr_in));
 301                 srv_socket->addr.ipv4.sin_family = AF_INET;
 302                 if (host == NULL) {
 303                         srv_socket->addr.ipv4.sin_addr.s_addr = htonl(INADDR_ANY);
 304                 } else {
 305                         struct hostent *he;
 306                         if (NULL == (he = gethostbyname(host))) {
 307                                 log_error_write(srv, __FILE__, __LINE__,
 308                                                 "sds", "gethostbyname failed: ",
 309                                                 h_errno, host);
 310                                 goto error_free_socket;
 311                         }
 312
 313                         if (he->h_addrtype != AF_INET) {
 314                                 log_error_write(srv, __FILE__, __LINE__, "sd", "addr-type != AF_INET: ", he->h_addrtype);
 315                                 goto error_free_socket;
 316                         }
 317
 318                         if (he->h_length != sizeof(struct in_addr)) {
 319                                 log_error_write(srv, __FILE__, __LINE__, "sd", "addr-length != sizeof(in_addr): ", he->h_length);
 320                                 goto error_free_socket;
 321                         }
 322
 323                         memcpy(&(srv_socket->addr.ipv4.sin_addr.s_addr), he->h_addr_list[0], he->h_length);
 324                 }
 325                 srv_socket->addr.ipv4.sin_port = htons(port);
 326                 addr_len = sizeof(struct sockaddr_in);
 327                 break;
 328 #ifdef HAVE_SYS_UN_H
 329         case AF_UNIX:
 330                 memset(&srv_socket->addr, 0, sizeof(struct sockaddr_un));
 331                 srv_socket->addr.un.sun_family = AF_UNIX;
 332                 {
 333                         size_t hostlen = strlen(host) + 1;
 334                         if (hostlen > sizeof(srv_socket->addr.un.sun_path)) {
 335                                 log_error_write(srv, __FILE__, __LINE__, "sS", "unix socket filename too long:", host);
 336                                 goto error_free_socket;
 337                         }
 338                         memcpy(srv_socket->addr.un.sun_path, host, hostlen);
 339
 340 #if defined(SUN_LEN)
 341                         addr_len = SUN_LEN(&srv_socket->addr.un);
 342 #else
 343                         /* stevens says: */
 344                         addr_len = hostlen + sizeof(srv_socket->addr.un.sun_family);
 345 #endif
 346                 }
 347
 348                 break;
 349 #endif
 350         default:
 351                 goto error_free_socket;
 352         }
 353
 354         if (srv->srvconf.preflight_check) {
 355                 err = 0;
 356                 goto error_free_socket;
 357         }
 358
 359         if (srv->sockets_disabled) { /* lighttpd -1 (one-shot mode) */
 360 #ifdef USE_OPENSSL
 361                 if (s->ssl_enabled) srv_socket->ssl_ctx = s->ssl_ctx;
 362 #endif
 363                 goto srv_sockets_append;
 364         }
 365
 366 #ifdef HAVE_SYS_UN_H
 367         if (AF_UNIX == srv_socket->addr.plain.sa_family) {
 368                 /* check if the socket exists and try to connect to it. */
 369                 force_assert(host); /*(static analysis hint)*/
 370                 if (-1 == (srv_socket->fd = socket(srv_socket->addr.plain.sa_family, SOCK_STREAM, 0))) {
 371                         log_error_write(srv, __FILE__, __LINE__, "ss", "socket failed:", strerror(errno));
 372                         goto error_free_socket;
 373                 }
 374                 if (0 == connect(srv_socket->fd, (struct sockaddr *) &(srv_socket->addr), addr_len)) {
 375                         log_error_write(srv, __FILE__, __LINE__, "ss",
 376                                 "server socket is still in use:",
 377                                 host);
 378
 379
 380                         goto error_free_socket;
 381                 }
 382
 383                 /* connect failed */
 384                 switch(errno) {
 385                 case ECONNREFUSED:
 386                         unlink(host);
 387                         break;
 388                 case ENOENT:
 389                         break;
 390                 default:
 391                         log_error_write(srv, __FILE__, __LINE__, "sds",
 392                                 "testing socket failed:",
 393                                 host, strerror(errno));
 394
 395                         goto error_free_socket;
 396                 }
 397         } else
 398 #endif
 399         {
 400                 if (-1 == (srv_socket->fd = socket(srv_socket->addr.plain.sa_family, SOCK_STREAM, IPPROTO_TCP))) {
 401                         log_error_write(srv, __FILE__, __LINE__, "ss", "socket failed:", strerror(errno));
 402                         goto error_free_socket;
 403                 }
 404
 405 #ifdef HAVE_IPV6
 406                 if (AF_INET6 == srv_socket->addr.plain.sa_family
 407                     && host != NULL) {
 408                         if (s->set_v6only) {
 409                                 val = 1;
 410                                 if (-1 == setsockopt(srv_socket->fd, IPPROTO_IPV6, IPV6_V6ONLY, &val, sizeof(val))) {
 411                                         log_error_write(srv, __FILE__, __LINE__, "ss", "socketsockopt(IPV6_V6ONLY) failed:", strerror(errno));
 412                                         goto error_free_socket;
 413                                 }
 414                         } else {
 415                                 log_error_write(srv, __FILE__, __LINE__, "s", "warning: server.set-v6only will be removed soon, update your config to have different sockets for ipv4 and ipv6");
 416                         }
 417                 }
 418 #endif
 419         }
 420
 421         /* set FD_CLOEXEC now, fdevent_fcntl_set is called later; needed for pipe-logger forks */
 422         fd_close_on_exec(srv_socket->fd);
 423
 424         /* */
 425         srv->cur_fds = srv_socket->fd;
 426
 427         val = 1;
 428         if (setsockopt(srv_socket->fd, SOL_SOCKET, SO_REUSEADDR, &val, sizeof(val)) < 0) {
 429                 log_error_write(srv, __FILE__, __LINE__, "ss", "socketsockopt(SO_REUSEADDR) failed:", strerror(errno));
 430                 goto error_free_socket;
 431         }
 432
 433         if (srv_socket->addr.plain.sa_family != AF_UNIX) {
 434                 val = 1;
 435                 if (setsockopt(srv_socket->fd, IPPROTO_TCP, TCP_NODELAY, &val, sizeof(val)) < 0) {
 436                         log_error_write(srv, __FILE__, __LINE__, "ss", "socketsockopt(TCP_NODELAY) failed:", strerror(errno));
 437                         goto error_free_socket;
 438                 }
 439         }
 440
 441         if (0 != bind(srv_socket->fd, (struct sockaddr *) &(srv_socket->addr), addr_len)) {
 442                 switch(srv_socket->addr.plain.sa_family) {
 443                 case AF_UNIX:
 444                         log_error_write(srv, __FILE__, __LINE__, "sds",
 445                                         "can't bind to socket:",
 446                                         host, strerror(errno));
 447                         break;
 448                 default:
 449                         log_error_write(srv, __FILE__, __LINE__, "ssds",
 450                                         "can't bind to port:",
 451                                         host, port, strerror(errno));
 452                         break;
 453                 }
 454                 goto error_free_socket;
 455         }
 456
 457         if (-1 == listen(srv_socket->fd, s->listen_backlog)) {
 458                 log_error_write(srv, __FILE__, __LINE__, "ss", "listen failed: ", strerror(errno));
 459                 goto error_free_socket;
 460         }
 461
 462         if (s->ssl_enabled) {
 463 #ifdef USE_OPENSSL
 464                 if (NULL == (srv_socket->ssl_ctx = s->ssl_ctx)) {
 465                         log_error_write(srv, __FILE__, __LINE__, "s", "ssl.pemfile has to be set");
 466                         goto error_free_socket;
 467                 }
 468 #else
 469
 470                 log_error_write(srv, __FILE__, __LINE__, "ss", "SSL:",
 471                                 "ssl requested but openssl support is not compiled in");
 472
 473                 goto error_free_socket;
 474 #endif
 475 #ifdef TCP_DEFER_ACCEPT
 476         } else if (s->defer_accept) {
 477                 int v = s->defer_accept;
 478                 if (-1 == setsockopt(srv_socket->fd, IPPROTO_TCP, TCP_DEFER_ACCEPT, &v, sizeof(v))) {
 479                         log_error_write(srv, __FILE__, __LINE__, "ss", "can't set TCP_DEFER_ACCEPT: ", strerror(errno));
 480                 }
 481 #endif
 482 #if defined(__FreeBSD__) || defined(__NetBSD__) \
 483  || defined(__OpenBSD__) || defined(__DragonflyBSD__)
 484         } else if (!buffer_is_empty(s->bsd_accept_filter)
 485                    && (buffer_is_equal_string(s->bsd_accept_filter, CONST_STR_LEN("httpready"))
 486                         || buffer_is_equal_string(s->bsd_accept_filter, CONST_STR_LEN("dataready")))) {
 487 #ifdef SO_ACCEPTFILTER
 488                 /* FreeBSD accf_http filter */
 489                 struct accept_filter_arg afa;
 490                 memset(&afa, 0, sizeof(afa));
 491                 strncpy(afa.af_name, s->bsd_accept_filter->ptr, sizeof(afa.af_name));
 492                 if (setsockopt(srv_socket->fd, SOL_SOCKET, SO_ACCEPTFILTER, &afa, sizeof(afa)) < 0) {
 493                         if (errno != ENOENT) {
 494                                 log_error_write(srv, __FILE__, __LINE__, "SBss", "can't set accept-filter '", s->bsd_accept_filter, "':", strerror(errno));
 495                         }
 496                 }
 497 #endif
 498 #endif
 499         }
 500
 501 srv_sockets_append:
 502         srv_socket->is_ssl = s->ssl_enabled;
 503
 504         if (srv->srv_sockets.size == 0) {
 505                 srv->srv_sockets.size = 4;
 506                 srv->srv_sockets.used = 0;
 507                 srv->srv_sockets.ptr = malloc(srv->srv_sockets.size * sizeof(server_socket*));
 508                 force_assert(NULL != srv->srv_sockets.ptr);
 509         } else if (srv->srv_sockets.used == srv->srv_sockets.size) {
 510                 srv->srv_sockets.size += 4;
 511                 srv->srv_sockets.ptr = realloc(srv->srv_sockets.ptr, srv->srv_sockets.size * sizeof(server_socket*));
 512                 force_assert(NULL != srv->srv_sockets.ptr);
 513         }
 514
 515         srv->srv_sockets.ptr[srv->srv_sockets.used++] = srv_socket;
 516
 517         buffer_free(b);
 518
 519         return 0;
 520
 521 error_free_socket:
 522         if (srv_socket->fd != -1) {
 523                 /* check if server fd are already registered */
 524                 if (srv_socket->fde_ndx != -1) {
 525                         fdevent_event_del(srv->ev, &(srv_socket->fde_ndx), srv_socket->fd);
 526                         fdevent_unregister(srv->ev, srv_socket->fd);
 527                 }
 528
 529                 close(srv_socket->fd);
 530         }
 531         buffer_free(srv_socket->srv_token);
 532         free(srv_socket);
 533
 534         buffer_free(b);
 535
 536         return err; /* -1 if error; 0 if srv->srvconf.preflight_check successful */
 537 }
 538
 539 int network_close(server *srv) {
 540         size_t i;
 541         for (i = 0; i < srv->srv_sockets.used; i++) {
 542                 server_socket *srv_socket = srv->srv_sockets.ptr[i];
 543
 544                 if (srv_socket->fd != -1) {
 545                         /* check if server fd are already registered */
 546                         if (srv_socket->fde_ndx != -1) {
 547                                 fdevent_event_del(srv->ev, &(srv_socket->fde_ndx), srv_socket->fd);
 548                                 fdevent_unregister(srv->ev, srv_socket->fd);
 549                         }
 550
 551                         close(srv_socket->fd);
 552                 }
 553
 554                 buffer_free(srv_socket->srv_token);
 555
 556                 free(srv_socket);
 557         }
 558
 559         free(srv->srv_sockets.ptr);
 560
 561         return 0;
 562 }
 563
 564 typedef enum {
 565         NETWORK_BACKEND_UNSET,
 566         NETWORK_BACKEND_WRITE,
 567         NETWORK_BACKEND_WRITEV,
 568         NETWORK_BACKEND_SENDFILE,
 569 } network_backend_t;
 570
 571 #ifdef USE_OPENSSL
 572 static X509* x509_load_pem_file(server *srv, const char *file) {
 573         BIO *in;
 574         X509 *x = NULL;
 575
 576         in = BIO_new(BIO_s_file());
 577         if (NULL == in) {
 578                 log_error_write(srv, __FILE__, __LINE__, "S", "SSL: BIO_new(BIO_s_file()) failed");
 579                 goto error;
 580         }
 581
 582         if (BIO_read_filename(in,file) <= 0) {
 583                 log_error_write(srv, __FILE__, __LINE__, "SSS", "SSL: BIO_read_filename('", file,"') failed");
 584                 goto error;
 585         }
 586         x = PEM_read_bio_X509(in, NULL, NULL, NULL);
 587
 588         if (NULL == x) {
 589                 log_error_write(srv, __FILE__, __LINE__, "SSS", "SSL: couldn't read X509 certificate from '", file,"'");
 590                 goto error;
 591         }
 592
 593         BIO_free(in);
 594         return x;
 595
 596 error:
 597         if (NULL != in) BIO_free(in);
 598         return NULL;
 599 }
 600
 601 static EVP_PKEY* evp_pkey_load_pem_file(server *srv, const char *file) {
 602         BIO *in;
 603         EVP_PKEY *x = NULL;
 604
 605         in=BIO_new(BIO_s_file());
 606         if (NULL == in) {
 607                 log_error_write(srv, __FILE__, __LINE__, "s", "SSL: BIO_new(BIO_s_file()) failed");
 608                 goto error;
 609         }
 610
 611         if (BIO_read_filename(in,file) <= 0) {
 612                 log_error_write(srv, __FILE__, __LINE__, "SSS", "SSL: BIO_read_filename('", file,"') failed");
 613                 goto error;
 614         }
 615         x = PEM_read_bio_PrivateKey(in, NULL, NULL, NULL);
 616
 617         if (NULL == x) {
 618                 log_error_write(srv, __FILE__, __LINE__, "SSS", "SSL: couldn't read private key from '", file,"'");
 619                 goto error;
 620         }
 621
 622         BIO_free(in);
 623         return x;
 624
 625 error:
 626         if (NULL != in) BIO_free(in);
 627         return NULL;
 628 }
 629
 630 static int network_openssl_load_pemfile(server *srv, size_t ndx) {
 631         specific_config *s = srv->config_storage[ndx];
 632
 633 #ifdef OPENSSL_NO_TLSEXT
 634         {
 635                 data_config *dc = (data_config *)srv->config_context->data[ndx];
 636                 if ((ndx > 0 && (COMP_SERVER_SOCKET != dc->comp || dc->cond != CONFIG_COND_EQ))
 637                         || !s->ssl_enabled) {
 638                         log_error_write(srv, __FILE__, __LINE__, "ss", "SSL:",
 639                                         "ssl.pemfile only works in SSL socket binding context as openssl version does not support TLS extensions");
 640                         return -1;
 641                 }
 642         }
 643 #endif
 644
 645         if (NULL == (s->ssl_pemfile_x509 = x509_load_pem_file(srv, s->ssl_pemfile->ptr))) return -1;
 646         if (NULL == (s->ssl_pemfile_pkey = evp_pkey_load_pem_file(srv, s->ssl_pemfile->ptr))) return -1;
 647
 648         if (!X509_check_private_key(s->ssl_pemfile_x509, s->ssl_pemfile_pkey)) {
 649                 log_error_write(srv, __FILE__, __LINE__, "sssb", "SSL:",
 650                                 "Private key does not match the certificate public key, reason:",
 651                                 ERR_error_string(ERR_get_error(), NULL),
 652                                 s->ssl_pemfile);
 653                 return -1;
 654         }
 655
 656         return 0;
 657 }
 658 #endif
 659
 660 int network_init(server *srv) {
 661         buffer *b;
 662         size_t i, j;
 663         network_backend_t backend;
 664
 665 #if OPENSSL_VERSION_NUMBER >= 0x0090800fL
 666 #ifndef OPENSSL_NO_ECDH
 667         EC_KEY *ecdh;
 668         int nid;
 669 #endif
 670 #endif
 671
 672 #ifdef USE_OPENSSL
 673 # ifndef OPENSSL_NO_DH
 674         DH *dh;
 675 # endif
 676         BIO *bio;
 677
 678        /* 1024-bit MODP Group with 160-bit prime order subgroup (RFC5114)
 679         * -----BEGIN DH PARAMETERS-----
 680         * MIIBDAKBgQCxC4+WoIDgHd6S3l6uXVTsUsmfvPsGo8aaap3KUtI7YWBz4oZ1oj0Y
 681         * mDjvHi7mUsAT7LSuqQYRIySXXDzUm4O/rMvdfZDEvXCYSI6cIZpzck7/1vrlZEc4
 682         * +qMaT/VbzMChUa9fDci0vUW/N982XBpl5oz9p21NpwjfH7K8LkpDcQKBgQCk0cvV
 683         * w/00EmdlpELvuZkF+BBN0lisUH/WQGz/FCZtMSZv6h5cQVZLd35pD1UE8hMWAhe0
 684         * sBuIal6RVH+eJ0n01/vX07mpLuGQnQ0iY/gKdqaiTAh6CR9THb8KAWm2oorWYqTR
 685         * jnOvoy13nVkY0IvIhY9Nzvl8KiSFXm7rIrOy5QICAKA=
 686         * -----END DH PARAMETERS-----
 687         */
 688
 689         static const unsigned char dh1024_p[]={
 690                 0xB1,0x0B,0x8F,0x96,0xA0,0x80,0xE0,0x1D,0xDE,0x92,0xDE,0x5E,
 691                 0xAE,0x5D,0x54,0xEC,0x52,0xC9,0x9F,0xBC,0xFB,0x06,0xA3,0xC6,
 692                 0x9A,0x6A,0x9D,0xCA,0x52,0xD2,0x3B,0x61,0x60,0x73,0xE2,0x86,
 693                 0x75,0xA2,0x3D,0x18,0x98,0x38,0xEF,0x1E,0x2E,0xE6,0x52,0xC0,
 694                 0x13,0xEC,0xB4,0xAE,0xA9,0x06,0x11,0x23,0x24,0x97,0x5C,0x3C,
 695                 0xD4,0x9B,0x83,0xBF,0xAC,0xCB,0xDD,0x7D,0x90,0xC4,0xBD,0x70,
 696                 0x98,0x48,0x8E,0x9C,0x21,0x9A,0x73,0x72,0x4E,0xFF,0xD6,0xFA,
 697                 0xE5,0x64,0x47,0x38,0xFA,0xA3,0x1A,0x4F,0xF5,0x5B,0xCC,0xC0,
 698                 0xA1,0x51,0xAF,0x5F,0x0D,0xC8,0xB4,0xBD,0x45,0xBF,0x37,0xDF,
 699                 0x36,0x5C,0x1A,0x65,0xE6,0x8C,0xFD,0xA7,0x6D,0x4D,0xA7,0x08,
 700                 0xDF,0x1F,0xB2,0xBC,0x2E,0x4A,0x43,0x71,
 701         };
 702
 703         static const unsigned char dh1024_g[]={
 704                 0xA4,0xD1,0xCB,0xD5,0xC3,0xFD,0x34,0x12,0x67,0x65,0xA4,0x42,
 705                 0xEF,0xB9,0x99,0x05,0xF8,0x10,0x4D,0xD2,0x58,0xAC,0x50,0x7F,
 706                 0xD6,0x40,0x6C,0xFF,0x14,0x26,0x6D,0x31,0x26,0x6F,0xEA,0x1E,
 707                 0x5C,0x41,0x56,0x4B,0x77,0x7E,0x69,0x0F,0x55,0x04,0xF2,0x13,
 708                 0x16,0x02,0x17,0xB4,0xB0,0x1B,0x88,0x6A,0x5E,0x91,0x54,0x7F,
 709                 0x9E,0x27,0x49,0xF4,0xD7,0xFB,0xD7,0xD3,0xB9,0xA9,0x2E,0xE1,
 710                 0x90,0x9D,0x0D,0x22,0x63,0xF8,0x0A,0x76,0xA6,0xA2,0x4C,0x08,
 711                 0x7A,0x09,0x1F,0x53,0x1D,0xBF,0x0A,0x01,0x69,0xB6,0xA2,0x8A,
 712                 0xD6,0x62,0xA4,0xD1,0x8E,0x73,0xAF,0xA3,0x2D,0x77,0x9D,0x59,
 713                 0x18,0xD0,0x8B,0xC8,0x85,0x8F,0x4D,0xCE,0xF9,0x7C,0x2A,0x24,
 714                 0x85,0x5E,0x6E,0xEB,0x22,0xB3,0xB2,0xE5,
 715         };
 716 #endif
 717
 718         struct nb_map {
 719                 network_backend_t nb;
 720                 const char *name;
 721         } network_backends[] = {
 722                 /* lowest id wins */
 723 #if defined USE_SENDFILE
 724                 { NETWORK_BACKEND_SENDFILE,   "sendfile" },
 725 #endif
 726 #if defined USE_LINUX_SENDFILE
 727                 { NETWORK_BACKEND_SENDFILE,   "linux-sendfile" },
 728 #endif
 729 #if defined USE_FREEBSD_SENDFILE
 730                 { NETWORK_BACKEND_SENDFILE,   "freebsd-sendfile" },
 731 #endif
 732 #if defined USE_SOLARIS_SENDFILEV
 733                 { NETWORK_BACKEND_SENDFILE,   "solaris-sendfilev" },
 734 #endif
 735 #if defined USE_WRITEV
 736                 { NETWORK_BACKEND_WRITEV,     "writev" },
 737 #endif
 738                 { NETWORK_BACKEND_WRITE,      "write" },
 739                 { NETWORK_BACKEND_UNSET,       NULL }
 740         };
 741
 742 #ifdef USE_OPENSSL
 743         /* load SSL certificates */
 744         for (i = 0; i < srv->config_context->used; i++) {
 745                 specific_config *s = srv->config_storage[i];
 746 #ifndef SSL_OP_NO_COMPRESSION
 747 # define SSL_OP_NO_COMPRESSION 0
 748 #endif
 749 #ifndef SSL_MODE_RELEASE_BUFFERS    /* OpenSSL >= 1.0.0 */
 750 #define SSL_MODE_RELEASE_BUFFERS 0
 751 #endif
 752                 long ssloptions =
 753                         SSL_OP_ALL | SSL_OP_NO_SESSION_RESUMPTION_ON_RENEGOTIATION | SSL_OP_NO_COMPRESSION;
 754
 755                 if (buffer_string_is_empty(s->ssl_pemfile) && buffer_string_is_empty(s->ssl_ca_file)) continue;
 756
 757                 if (srv->ssl_is_init == 0) {
 758                         SSL_load_error_strings();
 759                         SSL_library_init();
 760                         OpenSSL_add_all_algorithms();
 761                         srv->ssl_is_init = 1;
 762
 763                         if (0 == RAND_status()) {
 764                                 log_error_write(srv, __FILE__, __LINE__, "ss", "SSL:",
 765                                                 "not enough entropy in the pool");
 766                                 return -1;
 767                         }
 768                 }
 769
 770                 if (!buffer_string_is_empty(s->ssl_pemfile)) {
 771 #ifdef OPENSSL_NO_TLSEXT
 772                         data_config *dc = (data_config *)srv->config_context->data[i];
 773                         if (COMP_HTTP_HOST == dc->comp) {
 774                                 log_error_write(srv, __FILE__, __LINE__, "ss", "SSL:",
 775                                                 "can't use ssl.pemfile with $HTTP[\"host\"], openssl version does not support TLS extensions");
 776                                 return -1;
 777                         }
 778 #endif
 779                         if (network_openssl_load_pemfile(srv, i)) return -1;
 780                 }
 781
 782
 783                 if (!buffer_string_is_empty(s->ssl_ca_file)) {
 784                         s->ssl_ca_file_cert_names = SSL_load_client_CA_file(s->ssl_ca_file->ptr);
 785                         if (NULL == s->ssl_ca_file_cert_names) {
 786                                 log_error_write(srv, __FILE__, __LINE__, "ssb", "SSL:",
 787                                                 ERR_error_string(ERR_get_error(), NULL), s->ssl_ca_file);
 788                         }
 789                 }
 790
 791                 if (buffer_string_is_empty(s->ssl_pemfile) || !s->ssl_enabled) continue;
 792
 793                 if (NULL == (s->ssl_ctx = SSL_CTX_new(SSLv23_server_method()))) {
 794                         log_error_write(srv, __FILE__, __LINE__, "ss", "SSL:",
 795                                         ERR_error_string(ERR_get_error(), NULL));
 796                         return -1;
 797                 }
 798
 799                 /* completely useless identifier; required for client cert verification to work with sessions */
 800                 if (0 == SSL_CTX_set_session_id_context(s->ssl_ctx, (const unsigned char*) CONST_STR_LEN("lighttpd"))) {
 801                         log_error_write(srv, __FILE__, __LINE__, "ss:s", "SSL:",
 802                                 "failed to set session context",
 803                                 ERR_error_string(ERR_get_error(), NULL));
 804                         return -1;
 805                 }
 806
 807                 if (s->ssl_empty_fragments) {
 808 #ifdef SSL_OP_DONT_INSERT_EMPTY_FRAGMENTS
 809                         ssloptions &= ~SSL_OP_DONT_INSERT_EMPTY_FRAGMENTS;
 810 #else
 811                         ssloptions &= ~0x00000800L; /* hardcode constant */
 812                         log_error_write(srv, __FILE__, __LINE__, "ss", "WARNING: SSL:",
 813                                         "'insert empty fragments' not supported by the openssl version used to compile lighttpd with");
 814 #endif
 815                 }
 816
 817                 SSL_CTX_set_options(s->ssl_ctx, ssloptions);
 818                 SSL_CTX_set_info_callback(s->ssl_ctx, ssl_info_callback);
 819
 820                 if (!s->ssl_use_sslv2) {
 821                         /* disable SSLv2 */
 822                         if ((SSL_OP_NO_SSLv2 & SSL_CTX_set_options(s->ssl_ctx, SSL_OP_NO_SSLv2)) != SSL_OP_NO_SSLv2) {
 823                                 log_error_write(srv, __FILE__, __LINE__, "ss", "SSL:",
 824                                                 ERR_error_string(ERR_get_error(), NULL));
 825                                 return -1;
 826                         }
 827                 }
 828
 829                 if (!s->ssl_use_sslv3) {
 830                         /* disable SSLv3 */
 831                         if ((SSL_OP_NO_SSLv3 & SSL_CTX_set_options(s->ssl_ctx, SSL_OP_NO_SSLv3)) != SSL_OP_NO_SSLv3) {
 832                                 log_error_write(srv, __FILE__, __LINE__, "ss", "SSL:",
 833                                                 ERR_error_string(ERR_get_error(), NULL));
 834                                 return -1;
 835                         }
 836                 }
 837
 838                 if (!buffer_string_is_empty(s->ssl_cipher_list)) {
 839                         /* Disable support for low encryption ciphers */
 840                         if (SSL_CTX_set_cipher_list(s->ssl_ctx, s->ssl_cipher_list->ptr) != 1) {
 841                                 log_error_write(srv, __FILE__, __LINE__, "ss", "SSL:",
 842                                                 ERR_error_string(ERR_get_error(), NULL));
 843                                 return -1;
 844                         }
 845
 846                         if (s->ssl_honor_cipher_order) {
 847                                 SSL_CTX_set_options(s->ssl_ctx, SSL_OP_CIPHER_SERVER_PREFERENCE);
 848                         }
 849                 }
 850
 851 #ifndef OPENSSL_NO_DH
 852                 /* Support for Diffie-Hellman key exchange */
 853                 if (!buffer_string_is_empty(s->ssl_dh_file)) {
 854                         /* DH parameters from file */
 855                         bio = BIO_new_file((char *) s->ssl_dh_file->ptr, "r");
 856                         if (bio == NULL) {
 857                                 log_error_write(srv, __FILE__, __LINE__, "ss", "SSL: Unable to open file", s->ssl_dh_file->ptr);
 858                                 return -1;
 859                         }
 860                         dh = PEM_read_bio_DHparams(bio, NULL, NULL, NULL);
 861                         BIO_free(bio);
 862                         if (dh == NULL) {
 863                                 log_error_write(srv, __FILE__, __LINE__, "ss", "SSL: PEM_read_bio_DHparams failed", s->ssl_dh_file->ptr);
 864                                 return -1;
 865                         }
 866                 } else {
 867                         BIGNUM *dh_p, *dh_g;
 868                         /* Default DH parameters from RFC5114 */
 869                         dh = DH_new();
 870                         if (dh == NULL) {
 871                                 log_error_write(srv, __FILE__, __LINE__, "s", "SSL: DH_new () failed");
 872                                 return -1;
 873                         }
 874                         dh_p = BN_bin2bn(dh1024_p,sizeof(dh1024_p), NULL);
 875                         dh_g = BN_bin2bn(dh1024_g,sizeof(dh1024_g), NULL);
 876                         if ((dh_p == NULL) || (dh_g == NULL)) {
 877                                 DH_free(dh);
 878                                 log_error_write(srv, __FILE__, __LINE__, "s", "SSL: BN_bin2bn () failed");
 879                                 return -1;
 880                         }
 881                       #if OPENSSL_VERSION_NUMBER < 0x10100000L \
 882                         || defined(LIBRESSL_VERSION_NUMBER)
 883                         dh->p = dh_p;
 884                         dh->g = dh_g;
 885                         dh->length = 160;
 886                       #else
 887                         DH_set0_pqg(dh, dh_p, NULL, dh_g);
 888                         DH_set_length(dh, 160);
 889                       #endif
 890                 }
 891                 SSL_CTX_set_tmp_dh(s->ssl_ctx,dh);
 892                 SSL_CTX_set_options(s->ssl_ctx,SSL_OP_SINGLE_DH_USE);
 893                 DH_free(dh);
 894 #else
 895                 if (!buffer_string_is_empty(s->ssl_dh_file)) {
 896                         log_error_write(srv, __FILE__, __LINE__, "ss", "SSL: openssl compiled without DH support, can't load parameters from", s->ssl_dh_file->ptr);
 897                 }
 898 #endif
 899
 900 #if OPENSSL_VERSION_NUMBER >= 0x0090800fL
 901 #ifndef OPENSSL_NO_ECDH
 902                 /* Support for Elliptic-Curve Diffie-Hellman key exchange */
 903                 if (!buffer_string_is_empty(s->ssl_ec_curve)) {
 904                         /* OpenSSL only supports the "named curves" from RFC 4492, section 5.1.1. */
 905                         nid = OBJ_sn2nid((char *) s->ssl_ec_curve->ptr);
 906                         if (nid == 0) {
 907                                 log_error_write(srv, __FILE__, __LINE__, "ss", "SSL: Unknown curve name", s->ssl_ec_curve->ptr);
 908                                 return -1;
 909                         }
 910                 } else {
 911                         /* Default curve */
 912                         nid = OBJ_sn2nid("prime256v1");
 913                 }
 914                 ecdh = EC_KEY_new_by_curve_name(nid);
 915                 if (ecdh == NULL) {
 916                         log_error_write(srv, __FILE__, __LINE__, "ss", "SSL: Unable to create curve", s->ssl_ec_curve->ptr);
 917                         return -1;
 918                 }
 919                 SSL_CTX_set_tmp_ecdh(s->ssl_ctx,ecdh);
 920                 SSL_CTX_set_options(s->ssl_ctx,SSL_OP_SINGLE_ECDH_USE);
 921                 EC_KEY_free(ecdh);
 922 #endif
 923 #endif
 924
 925                 /* load all ssl.ca-files specified in the config into each SSL_CTX to be prepared for SNI */
 926                 for (j = 0; j < srv->config_context->used; j++) {
 927                         specific_config *s1 = srv->config_storage[j];
 928
 929                         if (!buffer_string_is_empty(s1->ssl_ca_file)) {
 930                                 if (1 != SSL_CTX_load_verify_locations(s->ssl_ctx, s1->ssl_ca_file->ptr, NULL)) {
 931                                         log_error_write(srv, __FILE__, __LINE__, "ssb", "SSL:",
 932                                                         ERR_error_string(ERR_get_error(), NULL), s1->ssl_ca_file);
 933                                         return -1;
 934                                 }
 935                         }
 936                 }
 937
 938                 if (s->ssl_verifyclient) {
 939                         if (NULL == s->ssl_ca_file_cert_names) {
 940                                 log_error_write(srv, __FILE__, __LINE__, "s",
 941                                         "SSL: You specified ssl.verifyclient.activate but no ca_file"
 942                                 );
 943                                 return -1;
 944                         }
 945                         SSL_CTX_set_client_CA_list(s->ssl_ctx, SSL_dup_CA_list(s->ssl_ca_file_cert_names));
 946                         SSL_CTX_set_verify(
 947                                 s->ssl_ctx,
 948                                 SSL_VERIFY_PEER | (s->ssl_verifyclient_enforce ? SSL_VERIFY_FAIL_IF_NO_PEER_CERT : 0),
 949                                 NULL
 950                         );
 951                         SSL_CTX_set_verify_depth(s->ssl_ctx, s->ssl_verifyclient_depth);
 952                 }
 953
 954                 if (1 != SSL_CTX_use_certificate(s->ssl_ctx, s->ssl_pemfile_x509)) {
 955                         log_error_write(srv, __FILE__, __LINE__, "ssb", "SSL:",
 956                                         ERR_error_string(ERR_get_error(), NULL), s->ssl_pemfile);
 957                         return -1;
 958                 }
 959
 960                 if (1 != SSL_CTX_use_PrivateKey(s->ssl_ctx, s->ssl_pemfile_pkey)) {
 961                         log_error_write(srv, __FILE__, __LINE__, "ssb", "SSL:",
 962                                         ERR_error_string(ERR_get_error(), NULL), s->ssl_pemfile);
 963                         return -1;
 964                 }
 965
 966                 if (SSL_CTX_check_private_key(s->ssl_ctx) != 1) {
 967                         log_error_write(srv, __FILE__, __LINE__, "sssb", "SSL:",
 968                                         "Private key does not match the certificate public key, reason:",
 969                                         ERR_error_string(ERR_get_error(), NULL),
 970                                         s->ssl_pemfile);
 971                         return -1;
 972                 }
 973                 SSL_CTX_set_default_read_ahead(s->ssl_ctx, 1);
 974                 SSL_CTX_set_mode(s->ssl_ctx,  SSL_CTX_get_mode(s->ssl_ctx)
 975                                             | SSL_MODE_ENABLE_PARTIAL_WRITE
 976                                             | SSL_MODE_ACCEPT_MOVING_WRITE_BUFFER
 977                                             | SSL_MODE_RELEASE_BUFFERS);
 978
 979 # ifndef OPENSSL_NO_TLSEXT
 980                 if (!SSL_CTX_set_tlsext_servername_callback(s->ssl_ctx, network_ssl_servername_callback) ||
 981                     !SSL_CTX_set_tlsext_servername_arg(s->ssl_ctx, srv)) {
 982                         log_error_write(srv, __FILE__, __LINE__, "ss", "SSL:",
 983                                         "failed to initialize TLS servername callback, openssl library does not support TLS servername extension");
 984                         return -1;
 985                 }
 986 # endif
 987         }
 988 #endif
 989
 990         b = buffer_init();
 991
 992         buffer_copy_buffer(b, srv->srvconf.bindhost);
 993         buffer_append_string_len(b, CONST_STR_LEN(":"));
 994         buffer_append_int(b, srv->srvconf.port);
 995
 996         if (0 != network_server_init(srv, b, srv->config_storage[0])) {
 997                 buffer_free(b);
 998                 return -1;
 999         }
1000         buffer_free(b);
1001
1002 #ifdef USE_OPENSSL
1003         srv->network_ssl_backend_write = network_write_chunkqueue_openssl;
1004 #endif
1005
1006         /* get a usefull default */
1007         backend = network_backends[0].nb;
1008
1009         /* match name against known types */
1010         if (!buffer_string_is_empty(srv->srvconf.network_backend)) {
1011                 for (i = 0; network_backends[i].name; i++) {
1012                         /**/
1013                         if (buffer_is_equal_string(srv->srvconf.network_backend, network_backends[i].name, strlen(network_backends[i].name))) {
1014                                 backend = network_backends[i].nb;
1015                                 break;
1016                         }
1017                 }
1018                 if (NULL == network_backends[i].name) {
1019                         /* we don't know it */
1020
1021                         log_error_write(srv, __FILE__, __LINE__, "sb",
1022                                         "server.network-backend has a unknown value:",
1023                                         srv->srvconf.network_backend);
1024
1025                         return -1;
1026                 }
1027         }
1028
1029         switch(backend) {
1030         case NETWORK_BACKEND_WRITE:
1031                 srv->network_backend_write = network_write_chunkqueue_write;
1032                 break;
1033 #if defined(USE_WRITEV)
1034         case NETWORK_BACKEND_WRITEV:
1035                 srv->network_backend_write = network_write_chunkqueue_writev;
1036                 break;
1037 #endif
1038 #if defined(USE_SENDFILE)
1039         case NETWORK_BACKEND_SENDFILE:
1040                 srv->network_backend_write = network_write_chunkqueue_sendfile;
1041                 break;
1042 #endif
1043         default:
1044                 return -1;
1045         }
1046
1047         /* check for $SERVER["socket"] */
1048         for (i = 1; i < srv->config_context->used; i++) {
1049                 data_config *dc = (data_config *)srv->config_context->data[i];
1050                 specific_config *s = srv->config_storage[i];
1051
1052                 /* not our stage */
1053                 if (COMP_SERVER_SOCKET != dc->comp) continue;
1054
1055                 if (dc->cond != CONFIG_COND_EQ) continue;
1056
1057                 /* check if we already know this socket,
1058                  * if yes, don't init it */
1059                 for (j = 0; j < srv->srv_sockets.used; j++) {
1060                         if (buffer_is_equal(srv->srv_sockets.ptr[j]->srv_token, dc->string)) {
1061                                 break;
1062                         }
1063                 }
1064
1065                 if (j == srv->srv_sockets.used) {
1066                         if (0 != network_server_init(srv, dc->string, s)) return -1;
1067                 }
1068         }
1069
1070         return 0;
1071 }
1072
1073 int network_register_fdevents(server *srv) {
1074         size_t i;
1075
1076         if (-1 == fdevent_reset(srv->ev)) {
1077                 return -1;
1078         }
1079
1080         if (srv->sockets_disabled) return 0; /* lighttpd -1 (one-shot mode) */
1081
1082         /* register fdevents after reset */
1083         for (i = 0; i < srv->srv_sockets.used; i++) {
1084                 server_socket *srv_socket = srv->srv_sockets.ptr[i];
1085
1086                 fdevent_register(srv->ev, srv_socket->fd, network_server_handle_fdevent, srv_socket);
1087                 fdevent_event_set(srv->ev, &(srv_socket->fde_ndx), srv_socket->fd, FDEVENT_IN);
1088         }
1089         return 0;
1090 }
1091
1092 int network_write_chunkqueue(server *srv, connection *con, chunkqueue *cq, off_t max_bytes) {
1093         int ret = -1;
1094         off_t written = 0;
1095 #ifdef TCP_CORK
1096         int corked = 0;
1097 #endif
1098         server_socket *srv_socket = con->srv_socket;
1099
1100         if (con->conf.global_kbytes_per_second) {
1101                 off_t limit = con->conf.global_kbytes_per_second * 1024 - *(con->conf.global_bytes_per_second_cnt_ptr);
1102                 if (limit <= 0) {
1103                         /* we reached the global traffic limit */
1104                         con->traffic_limit_reached = 1;
1105
1106                         return 1;
1107                 } else {
1108                         if (max_bytes > limit) max_bytes = limit;
1109                 }
1110         }
1111
1112         if (con->conf.kbytes_per_second) {
1113                 off_t limit = con->conf.kbytes_per_second * 1024 - con->bytes_written_cur_second;
1114                 if (limit <= 0) {
1115                         /* we reached the traffic limit */
1116                         con->traffic_limit_reached = 1;
1117
1118                         return 1;
1119                 } else {
1120                         if (max_bytes > limit) max_bytes = limit;
1121                 }
1122         }
1123
1124         written = cq->bytes_out;
1125
1126 #ifdef TCP_CORK
1127         /* Linux: put a cork into the socket as we want to combine the write() calls
1128          * but only if we really have multiple chunks
1129          */
1130         if (cq->first && cq->first->next) {
1131                 corked = 1;
1132                 (void)setsockopt(con->fd, IPPROTO_TCP, TCP_CORK, &corked, sizeof(corked));
1133         }
1134 #endif
1135
1136         if (srv_socket->is_ssl) {
1137 #ifdef USE_OPENSSL
1138                 ret = srv->network_ssl_backend_write(srv, con, con->ssl, cq, max_bytes);
1139 #endif
1140         } else {
1141                 ret = srv->network_backend_write(srv, con, con->fd, cq, max_bytes);
1142         }
1143
1144         if (ret >= 0) {
1145                 chunkqueue_remove_finished_chunks(cq);
1146                 ret = chunkqueue_is_empty(cq) ? 0 : 1;
1147         }
1148
1149 #ifdef TCP_CORK
1150         if (corked) {
1151                 corked = 0;
1152                 (void)setsockopt(con->fd, IPPROTO_TCP, TCP_CORK, &corked, sizeof(corked));
1153         }
1154 #endif
1155
1156         written = cq->bytes_out - written;
1157         con->bytes_written += written;
1158         con->bytes_written_cur_second += written;
1159
1160         *(con->conf.global_bytes_per_second_cnt_ptr) += written;
1161
1162         return ret;
1163 }