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                                 hints.ai_family = AF_INET;
 285                                 if (
 286                                   #ifdef EAI_ADDRFAMILY
 287                                     EAI_ADDRFAMILY == r &&
 288                                   #endif
 289                                     0 == getaddrinfo(host, NULL, &hints, &res)) {
 290                                         memcpy(&srv_socket->addr.ipv4, res->ai_addr, res->ai_addrlen);
 291                                         srv_socket->addr.ipv4.sin_family = AF_INET;
 292                                         srv_socket->addr.ipv4.sin_port = htons(port);
 293                                         addr_len = sizeof(struct sockaddr_in);
 294                                         /*assert(addr_len == res->ai_addrlen);*/
 295                                         freeaddrinfo(res);
 296                                         break;
 297                                 }
 298
 299                                 log_error_write(srv, __FILE__, __LINE__,
 300                                                 "sssss", "getaddrinfo failed: ",
 301                                                 gai_strerror(r), "'", host, "'");
 302
 303                                 goto error_free_socket;
 304                         }
 305
 306                         memcpy(&(srv_socket->addr), res->ai_addr, res->ai_addrlen);
 307
 308                         freeaddrinfo(res);
 309                 }
 310                 srv_socket->addr.ipv6.sin6_port = htons(port);
 311                 addr_len = sizeof(struct sockaddr_in6);
 312                 break;
 313 #endif
 314         case AF_INET:
 315                 memset(&srv_socket->addr, 0, sizeof(struct sockaddr_in));
 316                 srv_socket->addr.ipv4.sin_family = AF_INET;
 317                 if (host == NULL) {
 318                         srv_socket->addr.ipv4.sin_addr.s_addr = htonl(INADDR_ANY);
 319                 } else {
 320                         struct hostent *he;
 321                         if (NULL == (he = gethostbyname(host))) {
 322                                 log_error_write(srv, __FILE__, __LINE__,
 323                                                 "sds", "gethostbyname failed: ",
 324                                                 h_errno, host);
 325                                 goto error_free_socket;
 326                         }
 327
 328                         if (he->h_addrtype != AF_INET) {
 329                                 log_error_write(srv, __FILE__, __LINE__, "sd", "addr-type != AF_INET: ", he->h_addrtype);
 330                                 goto error_free_socket;
 331                         }
 332
 333                         if (he->h_length != sizeof(struct in_addr)) {
 334                                 log_error_write(srv, __FILE__, __LINE__, "sd", "addr-length != sizeof(in_addr): ", he->h_length);
 335                                 goto error_free_socket;
 336                         }
 337
 338                         memcpy(&(srv_socket->addr.ipv4.sin_addr.s_addr), he->h_addr_list[0], he->h_length);
 339                 }
 340                 srv_socket->addr.ipv4.sin_port = htons(port);
 341                 addr_len = sizeof(struct sockaddr_in);
 342                 break;
 343 #ifdef HAVE_SYS_UN_H
 344         case AF_UNIX:
 345                 memset(&srv_socket->addr, 0, sizeof(struct sockaddr_un));
 346                 srv_socket->addr.un.sun_family = AF_UNIX;
 347                 {
 348                         size_t hostlen = strlen(host) + 1;
 349                         if (hostlen > sizeof(srv_socket->addr.un.sun_path)) {
 350                                 log_error_write(srv, __FILE__, __LINE__, "sS", "unix socket filename too long:", host);
 351                                 goto error_free_socket;
 352                         }
 353                         memcpy(srv_socket->addr.un.sun_path, host, hostlen);
 354
 355 #if defined(SUN_LEN)
 356                         addr_len = SUN_LEN(&srv_socket->addr.un);
 357 #else
 358                         /* stevens says: */
 359                         addr_len = hostlen + sizeof(srv_socket->addr.un.sun_family);
 360 #endif
 361                 }
 362
 363                 break;
 364 #endif
 365         default:
 366                 goto error_free_socket;
 367         }
 368
 369         if (srv->srvconf.preflight_check) {
 370                 err = 0;
 371                 goto error_free_socket;
 372         }
 373
 374         if (srv->sockets_disabled) { /* lighttpd -1 (one-shot mode) */
 375 #ifdef USE_OPENSSL
 376                 if (s->ssl_enabled) srv_socket->ssl_ctx = s->ssl_ctx;
 377 #endif
 378                 goto srv_sockets_append;
 379         }
 380
 381 #ifdef HAVE_SYS_UN_H
 382         if (AF_UNIX == srv_socket->addr.plain.sa_family) {
 383                 /* check if the socket exists and try to connect to it. */
 384                 force_assert(host); /*(static analysis hint)*/
 385                 if (-1 == (srv_socket->fd = fdevent_socket_cloexec(srv_socket->addr.plain.sa_family, SOCK_STREAM, 0))) {
 386                         log_error_write(srv, __FILE__, __LINE__, "ss", "socket failed:", strerror(errno));
 387                         goto error_free_socket;
 388                 }
 389                 if (0 == connect(srv_socket->fd, (struct sockaddr *) &(srv_socket->addr), addr_len)) {
 390                         log_error_write(srv, __FILE__, __LINE__, "ss",
 391                                 "server socket is still in use:",
 392                                 host);
 393
 394
 395                         goto error_free_socket;
 396                 }
 397
 398                 /* connect failed */
 399                 switch(errno) {
 400                 case ECONNREFUSED:
 401                         unlink(host);
 402                         break;
 403                 case ENOENT:
 404                         break;
 405                 default:
 406                         log_error_write(srv, __FILE__, __LINE__, "sds",
 407                                 "testing socket failed:",
 408                                 host, strerror(errno));
 409
 410                         goto error_free_socket;
 411                 }
 412
 413                 fdevent_fcntl_set_nb(srv->ev, srv_socket->fd);
 414         } else
 415 #endif
 416         {
 417                 if (-1 == (srv_socket->fd = fdevent_socket_nb_cloexec(srv_socket->addr.plain.sa_family, SOCK_STREAM, IPPROTO_TCP))) {
 418                         log_error_write(srv, __FILE__, __LINE__, "ss", "socket failed:", strerror(errno));
 419                         goto error_free_socket;
 420                 }
 421
 422 #ifdef HAVE_IPV6
 423                 if (AF_INET6 == srv_socket->addr.plain.sa_family
 424                     && host != NULL) {
 425                         if (s->set_v6only) {
 426                                 val = 1;
 427                                 if (-1 == setsockopt(srv_socket->fd, IPPROTO_IPV6, IPV6_V6ONLY, &val, sizeof(val))) {
 428                                         log_error_write(srv, __FILE__, __LINE__, "ss", "socketsockopt(IPV6_V6ONLY) failed:", strerror(errno));
 429                                         goto error_free_socket;
 430                                 }
 431                         } else {
 432                                 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");
 433                         }
 434                 }
 435 #endif
 436         }
 437
 438         /* */
 439         srv->cur_fds = srv_socket->fd;
 440
 441         val = 1;
 442         if (setsockopt(srv_socket->fd, SOL_SOCKET, SO_REUSEADDR, &val, sizeof(val)) < 0) {
 443                 log_error_write(srv, __FILE__, __LINE__, "ss", "socketsockopt(SO_REUSEADDR) failed:", strerror(errno));
 444                 goto error_free_socket;
 445         }
 446
 447         if (srv_socket->addr.plain.sa_family != AF_UNIX) {
 448                 val = 1;
 449                 if (setsockopt(srv_socket->fd, IPPROTO_TCP, TCP_NODELAY, &val, sizeof(val)) < 0) {
 450                         log_error_write(srv, __FILE__, __LINE__, "ss", "socketsockopt(TCP_NODELAY) failed:", strerror(errno));
 451                         goto error_free_socket;
 452                 }
 453         }
 454
 455         if (0 != bind(srv_socket->fd, (struct sockaddr *) &(srv_socket->addr), addr_len)) {
 456                 switch(srv_socket->addr.plain.sa_family) {
 457                 case AF_UNIX:
 458                         log_error_write(srv, __FILE__, __LINE__, "sds",
 459                                         "can't bind to socket:",
 460                                         host, strerror(errno));
 461                         break;
 462                 default:
 463                         log_error_write(srv, __FILE__, __LINE__, "ssds",
 464                                         "can't bind to port:",
 465                                         host, port, strerror(errno));
 466                         break;
 467                 }
 468                 goto error_free_socket;
 469         }
 470
 471         if (-1 == listen(srv_socket->fd, s->listen_backlog)) {
 472                 log_error_write(srv, __FILE__, __LINE__, "ss", "listen failed: ", strerror(errno));
 473                 goto error_free_socket;
 474         }
 475
 476         if (s->ssl_enabled) {
 477 #ifdef USE_OPENSSL
 478                 if (NULL == (srv_socket->ssl_ctx = s->ssl_ctx)) {
 479                         log_error_write(srv, __FILE__, __LINE__, "s", "ssl.pemfile has to be set");
 480                         goto error_free_socket;
 481                 }
 482 #else
 483
 484                 log_error_write(srv, __FILE__, __LINE__, "ss", "SSL:",
 485                                 "ssl requested but openssl support is not compiled in");
 486
 487                 goto error_free_socket;
 488 #endif
 489 #ifdef TCP_DEFER_ACCEPT
 490         } else if (s->defer_accept) {
 491                 int v = s->defer_accept;
 492                 if (-1 == setsockopt(srv_socket->fd, IPPROTO_TCP, TCP_DEFER_ACCEPT, &v, sizeof(v))) {
 493                         log_error_write(srv, __FILE__, __LINE__, "ss", "can't set TCP_DEFER_ACCEPT: ", strerror(errno));
 494                 }
 495 #endif
 496 #if defined(__FreeBSD__) || defined(__NetBSD__) \
 497  || defined(__OpenBSD__) || defined(__DragonFly__)
 498         } else if (!buffer_is_empty(s->bsd_accept_filter)
 499                    && (buffer_is_equal_string(s->bsd_accept_filter, CONST_STR_LEN("httpready"))
 500                         || buffer_is_equal_string(s->bsd_accept_filter, CONST_STR_LEN("dataready")))) {
 501 #ifdef SO_ACCEPTFILTER
 502                 /* FreeBSD accf_http filter */
 503                 struct accept_filter_arg afa;
 504                 memset(&afa, 0, sizeof(afa));
 505                 strncpy(afa.af_name, s->bsd_accept_filter->ptr, sizeof(afa.af_name));
 506                 if (setsockopt(srv_socket->fd, SOL_SOCKET, SO_ACCEPTFILTER, &afa, sizeof(afa)) < 0) {
 507                         if (errno != ENOENT) {
 508                                 log_error_write(srv, __FILE__, __LINE__, "SBss", "can't set accept-filter '", s->bsd_accept_filter, "':", strerror(errno));
 509                         }
 510                 }
 511 #endif
 512 #endif
 513         }
 514
 515 srv_sockets_append:
 516         srv_socket->is_ssl = s->ssl_enabled;
 517
 518         if (srv->srv_sockets.size == 0) {
 519                 srv->srv_sockets.size = 4;
 520                 srv->srv_sockets.used = 0;
 521                 srv->srv_sockets.ptr = malloc(srv->srv_sockets.size * sizeof(server_socket*));
 522                 force_assert(NULL != srv->srv_sockets.ptr);
 523         } else if (srv->srv_sockets.used == srv->srv_sockets.size) {
 524                 srv->srv_sockets.size += 4;
 525                 srv->srv_sockets.ptr = realloc(srv->srv_sockets.ptr, srv->srv_sockets.size * sizeof(server_socket*));
 526                 force_assert(NULL != srv->srv_sockets.ptr);
 527         }
 528
 529         srv->srv_sockets.ptr[srv->srv_sockets.used++] = srv_socket;
 530
 531         buffer_free(b);
 532
 533         return 0;
 534
 535 error_free_socket:
 536         if (srv_socket->fd != -1) {
 537                 /* check if server fd are already registered */
 538                 if (srv_socket->fde_ndx != -1) {
 539                         fdevent_event_del(srv->ev, &(srv_socket->fde_ndx), srv_socket->fd);
 540                         fdevent_unregister(srv->ev, srv_socket->fd);
 541                 }
 542
 543                 close(srv_socket->fd);
 544         }
 545         buffer_free(srv_socket->srv_token);
 546         free(srv_socket);
 547
 548         buffer_free(b);
 549
 550         return err; /* -1 if error; 0 if srv->srvconf.preflight_check successful */
 551 }
 552
 553 int network_close(server *srv) {
 554         size_t i;
 555         for (i = 0; i < srv->srv_sockets.used; i++) {
 556                 server_socket *srv_socket = srv->srv_sockets.ptr[i];
 557
 558                 if (srv_socket->fd != -1) {
 559                         /* check if server fd are already registered */
 560                         if (srv_socket->fde_ndx != -1) {
 561                                 fdevent_event_del(srv->ev, &(srv_socket->fde_ndx), srv_socket->fd);
 562                                 fdevent_unregister(srv->ev, srv_socket->fd);
 563                         }
 564
 565                         close(srv_socket->fd);
 566                 }
 567
 568                 buffer_free(srv_socket->srv_token);
 569
 570                 free(srv_socket);
 571         }
 572
 573         free(srv->srv_sockets.ptr);
 574
 575         return 0;
 576 }
 577
 578 typedef enum {
 579         NETWORK_BACKEND_UNSET,
 580         NETWORK_BACKEND_WRITE,
 581         NETWORK_BACKEND_WRITEV,
 582         NETWORK_BACKEND_SENDFILE,
 583 } network_backend_t;
 584
 585 #ifdef USE_OPENSSL
 586 static X509* x509_load_pem_file(server *srv, const char *file) {
 587         BIO *in;
 588         X509 *x = NULL;
 589
 590         in = BIO_new(BIO_s_file());
 591         if (NULL == in) {
 592                 log_error_write(srv, __FILE__, __LINE__, "S", "SSL: BIO_new(BIO_s_file()) failed");
 593                 goto error;
 594         }
 595
 596         if (BIO_read_filename(in,file) <= 0) {
 597                 log_error_write(srv, __FILE__, __LINE__, "SSS", "SSL: BIO_read_filename('", file,"') failed");
 598                 goto error;
 599         }
 600         x = PEM_read_bio_X509(in, NULL, NULL, NULL);
 601
 602         if (NULL == x) {
 603                 log_error_write(srv, __FILE__, __LINE__, "SSS", "SSL: couldn't read X509 certificate from '", file,"'");
 604                 goto error;
 605         }
 606
 607         BIO_free(in);
 608         return x;
 609
 610 error:
 611         if (NULL != in) BIO_free(in);
 612         return NULL;
 613 }
 614
 615 static EVP_PKEY* evp_pkey_load_pem_file(server *srv, const char *file) {
 616         BIO *in;
 617         EVP_PKEY *x = NULL;
 618
 619         in=BIO_new(BIO_s_file());
 620         if (NULL == in) {
 621                 log_error_write(srv, __FILE__, __LINE__, "s", "SSL: BIO_new(BIO_s_file()) failed");
 622                 goto error;
 623         }
 624
 625         if (BIO_read_filename(in,file) <= 0) {
 626                 log_error_write(srv, __FILE__, __LINE__, "SSS", "SSL: BIO_read_filename('", file,"') failed");
 627                 goto error;
 628         }
 629         x = PEM_read_bio_PrivateKey(in, NULL, NULL, NULL);
 630
 631         if (NULL == x) {
 632                 log_error_write(srv, __FILE__, __LINE__, "SSS", "SSL: couldn't read private key from '", file,"'");
 633                 goto error;
 634         }
 635
 636         BIO_free(in);
 637         return x;
 638
 639 error:
 640         if (NULL != in) BIO_free(in);
 641         return NULL;
 642 }
 643
 644 static int network_openssl_load_pemfile(server *srv, size_t ndx) {
 645         specific_config *s = srv->config_storage[ndx];
 646
 647 #ifdef OPENSSL_NO_TLSEXT
 648         {
 649                 data_config *dc = (data_config *)srv->config_context->data[ndx];
 650                 if ((ndx > 0 && (COMP_SERVER_SOCKET != dc->comp || dc->cond != CONFIG_COND_EQ))
 651                         || !s->ssl_enabled) {
 652                         log_error_write(srv, __FILE__, __LINE__, "ss", "SSL:",
 653                                         "ssl.pemfile only works in SSL socket binding context as openssl version does not support TLS extensions");
 654                         return -1;
 655                 }
 656         }
 657 #endif
 658
 659         if (NULL == (s->ssl_pemfile_x509 = x509_load_pem_file(srv, s->ssl_pemfile->ptr))) return -1;
 660         if (NULL == (s->ssl_pemfile_pkey = evp_pkey_load_pem_file(srv, s->ssl_pemfile->ptr))) return -1;
 661
 662         if (!X509_check_private_key(s->ssl_pemfile_x509, s->ssl_pemfile_pkey)) {
 663                 log_error_write(srv, __FILE__, __LINE__, "sssb", "SSL:",
 664                                 "Private key does not match the certificate public key, reason:",
 665                                 ERR_error_string(ERR_get_error(), NULL),
 666                                 s->ssl_pemfile);
 667                 return -1;
 668         }
 669
 670         return 0;
 671 }
 672 #endif
 673
 674 int network_init(server *srv) {
 675         buffer *b;
 676         size_t i, j;
 677         network_backend_t backend;
 678
 679 #if OPENSSL_VERSION_NUMBER >= 0x0090800fL
 680 #ifndef OPENSSL_NO_ECDH
 681         EC_KEY *ecdh;
 682         int nid;
 683 #endif
 684 #endif
 685
 686 #ifdef USE_OPENSSL
 687 # ifndef OPENSSL_NO_DH
 688         DH *dh;
 689 # endif
 690         BIO *bio;
 691
 692        /* 1024-bit MODP Group with 160-bit prime order subgroup (RFC5114)
 693         * -----BEGIN DH PARAMETERS-----
 694         * MIIBDAKBgQCxC4+WoIDgHd6S3l6uXVTsUsmfvPsGo8aaap3KUtI7YWBz4oZ1oj0Y
 695         * mDjvHi7mUsAT7LSuqQYRIySXXDzUm4O/rMvdfZDEvXCYSI6cIZpzck7/1vrlZEc4
 696         * +qMaT/VbzMChUa9fDci0vUW/N982XBpl5oz9p21NpwjfH7K8LkpDcQKBgQCk0cvV
 697         * w/00EmdlpELvuZkF+BBN0lisUH/WQGz/FCZtMSZv6h5cQVZLd35pD1UE8hMWAhe0
 698         * sBuIal6RVH+eJ0n01/vX07mpLuGQnQ0iY/gKdqaiTAh6CR9THb8KAWm2oorWYqTR
 699         * jnOvoy13nVkY0IvIhY9Nzvl8KiSFXm7rIrOy5QICAKA=
 700         * -----END DH PARAMETERS-----
 701         */
 702
 703         static const unsigned char dh1024_p[]={
 704                 0xB1,0x0B,0x8F,0x96,0xA0,0x80,0xE0,0x1D,0xDE,0x92,0xDE,0x5E,
 705                 0xAE,0x5D,0x54,0xEC,0x52,0xC9,0x9F,0xBC,0xFB,0x06,0xA3,0xC6,
 706                 0x9A,0x6A,0x9D,0xCA,0x52,0xD2,0x3B,0x61,0x60,0x73,0xE2,0x86,
 707                 0x75,0xA2,0x3D,0x18,0x98,0x38,0xEF,0x1E,0x2E,0xE6,0x52,0xC0,
 708                 0x13,0xEC,0xB4,0xAE,0xA9,0x06,0x11,0x23,0x24,0x97,0x5C,0x3C,
 709                 0xD4,0x9B,0x83,0xBF,0xAC,0xCB,0xDD,0x7D,0x90,0xC4,0xBD,0x70,
 710                 0x98,0x48,0x8E,0x9C,0x21,0x9A,0x73,0x72,0x4E,0xFF,0xD6,0xFA,
 711                 0xE5,0x64,0x47,0x38,0xFA,0xA3,0x1A,0x4F,0xF5,0x5B,0xCC,0xC0,
 712                 0xA1,0x51,0xAF,0x5F,0x0D,0xC8,0xB4,0xBD,0x45,0xBF,0x37,0xDF,
 713                 0x36,0x5C,0x1A,0x65,0xE6,0x8C,0xFD,0xA7,0x6D,0x4D,0xA7,0x08,
 714                 0xDF,0x1F,0xB2,0xBC,0x2E,0x4A,0x43,0x71,
 715         };
 716
 717         static const unsigned char dh1024_g[]={
 718                 0xA4,0xD1,0xCB,0xD5,0xC3,0xFD,0x34,0x12,0x67,0x65,0xA4,0x42,
 719                 0xEF,0xB9,0x99,0x05,0xF8,0x10,0x4D,0xD2,0x58,0xAC,0x50,0x7F,
 720                 0xD6,0x40,0x6C,0xFF,0x14,0x26,0x6D,0x31,0x26,0x6F,0xEA,0x1E,
 721                 0x5C,0x41,0x56,0x4B,0x77,0x7E,0x69,0x0F,0x55,0x04,0xF2,0x13,
 722                 0x16,0x02,0x17,0xB4,0xB0,0x1B,0x88,0x6A,0x5E,0x91,0x54,0x7F,
 723                 0x9E,0x27,0x49,0xF4,0xD7,0xFB,0xD7,0xD3,0xB9,0xA9,0x2E,0xE1,
 724                 0x90,0x9D,0x0D,0x22,0x63,0xF8,0x0A,0x76,0xA6,0xA2,0x4C,0x08,
 725                 0x7A,0x09,0x1F,0x53,0x1D,0xBF,0x0A,0x01,0x69,0xB6,0xA2,0x8A,
 726                 0xD6,0x62,0xA4,0xD1,0x8E,0x73,0xAF,0xA3,0x2D,0x77,0x9D,0x59,
 727                 0x18,0xD0,0x8B,0xC8,0x85,0x8F,0x4D,0xCE,0xF9,0x7C,0x2A,0x24,
 728                 0x85,0x5E,0x6E,0xEB,0x22,0xB3,0xB2,0xE5,
 729         };
 730 #endif
 731
 732         struct nb_map {
 733                 network_backend_t nb;
 734                 const char *name;
 735         } network_backends[] = {
 736                 /* lowest id wins */
 737 #if defined USE_SENDFILE
 738                 { NETWORK_BACKEND_SENDFILE,   "sendfile" },
 739 #endif
 740 #if defined USE_LINUX_SENDFILE
 741                 { NETWORK_BACKEND_SENDFILE,   "linux-sendfile" },
 742 #endif
 743 #if defined USE_FREEBSD_SENDFILE
 744                 { NETWORK_BACKEND_SENDFILE,   "freebsd-sendfile" },
 745 #endif
 746 #if defined USE_SOLARIS_SENDFILEV
 747                 { NETWORK_BACKEND_SENDFILE,   "solaris-sendfilev" },
 748 #endif
 749 #if defined USE_WRITEV
 750                 { NETWORK_BACKEND_WRITEV,     "writev" },
 751 #endif
 752                 { NETWORK_BACKEND_WRITE,      "write" },
 753                 { NETWORK_BACKEND_UNSET,       NULL }
 754         };
 755
 756 #ifdef USE_OPENSSL
 757         /* load SSL certificates */
 758         for (i = 0; i < srv->config_context->used; i++) {
 759                 specific_config *s = srv->config_storage[i];
 760 #ifndef SSL_OP_NO_COMPRESSION
 761 # define SSL_OP_NO_COMPRESSION 0
 762 #endif
 763 #ifndef SSL_MODE_RELEASE_BUFFERS    /* OpenSSL >= 1.0.0 */
 764 #define SSL_MODE_RELEASE_BUFFERS 0
 765 #endif
 766                 long ssloptions =
 767                         SSL_OP_ALL | SSL_OP_NO_SESSION_RESUMPTION_ON_RENEGOTIATION | SSL_OP_NO_COMPRESSION;
 768
 769                 if (buffer_string_is_empty(s->ssl_pemfile) && buffer_string_is_empty(s->ssl_ca_file)) continue;
 770
 771                 if (srv->ssl_is_init == 0) {
 772                         SSL_load_error_strings();
 773                         SSL_library_init();
 774                         OpenSSL_add_all_algorithms();
 775                         srv->ssl_is_init = 1;
 776
 777                         if (0 == RAND_status()) {
 778                                 log_error_write(srv, __FILE__, __LINE__, "ss", "SSL:",
 779                                                 "not enough entropy in the pool");
 780                                 return -1;
 781                         }
 782                 }
 783
 784                 if (!buffer_string_is_empty(s->ssl_pemfile)) {
 785 #ifdef OPENSSL_NO_TLSEXT
 786                         data_config *dc = (data_config *)srv->config_context->data[i];
 787                         if (COMP_HTTP_HOST == dc->comp) {
 788                                 log_error_write(srv, __FILE__, __LINE__, "ss", "SSL:",
 789                                                 "can't use ssl.pemfile with $HTTP[\"host\"], openssl version does not support TLS extensions");
 790                                 return -1;
 791                         }
 792 #endif
 793                         if (network_openssl_load_pemfile(srv, i)) return -1;
 794                 }
 795
 796
 797                 if (!buffer_string_is_empty(s->ssl_ca_file)) {
 798                         s->ssl_ca_file_cert_names = SSL_load_client_CA_file(s->ssl_ca_file->ptr);
 799                         if (NULL == s->ssl_ca_file_cert_names) {
 800                                 log_error_write(srv, __FILE__, __LINE__, "ssb", "SSL:",
 801                                                 ERR_error_string(ERR_get_error(), NULL), s->ssl_ca_file);
 802                         }
 803                 }
 804
 805                 if (buffer_string_is_empty(s->ssl_pemfile) || !s->ssl_enabled) continue;
 806
 807                 if (NULL == (s->ssl_ctx = SSL_CTX_new(SSLv23_server_method()))) {
 808                         log_error_write(srv, __FILE__, __LINE__, "ss", "SSL:",
 809                                         ERR_error_string(ERR_get_error(), NULL));
 810                         return -1;
 811                 }
 812
 813                 /* completely useless identifier; required for client cert verification to work with sessions */
 814                 if (0 == SSL_CTX_set_session_id_context(s->ssl_ctx, (const unsigned char*) CONST_STR_LEN("lighttpd"))) {
 815                         log_error_write(srv, __FILE__, __LINE__, "ss:s", "SSL:",
 816                                 "failed to set session context",
 817                                 ERR_error_string(ERR_get_error(), NULL));
 818                         return -1;
 819                 }
 820
 821                 if (s->ssl_empty_fragments) {
 822 #ifdef SSL_OP_DONT_INSERT_EMPTY_FRAGMENTS
 823                         ssloptions &= ~SSL_OP_DONT_INSERT_EMPTY_FRAGMENTS;
 824 #else
 825                         ssloptions &= ~0x00000800L; /* hardcode constant */
 826                         log_error_write(srv, __FILE__, __LINE__, "ss", "WARNING: SSL:",
 827                                         "'insert empty fragments' not supported by the openssl version used to compile lighttpd with");
 828 #endif
 829                 }
 830
 831                 SSL_CTX_set_options(s->ssl_ctx, ssloptions);
 832                 SSL_CTX_set_info_callback(s->ssl_ctx, ssl_info_callback);
 833
 834                 if (!s->ssl_use_sslv2) {
 835                         /* disable SSLv2 */
 836                         if ((SSL_OP_NO_SSLv2 & SSL_CTX_set_options(s->ssl_ctx, SSL_OP_NO_SSLv2)) != SSL_OP_NO_SSLv2) {
 837                                 log_error_write(srv, __FILE__, __LINE__, "ss", "SSL:",
 838                                                 ERR_error_string(ERR_get_error(), NULL));
 839                                 return -1;
 840                         }
 841                 }
 842
 843                 if (!s->ssl_use_sslv3) {
 844                         /* disable SSLv3 */
 845                         if ((SSL_OP_NO_SSLv3 & SSL_CTX_set_options(s->ssl_ctx, SSL_OP_NO_SSLv3)) != SSL_OP_NO_SSLv3) {
 846                                 log_error_write(srv, __FILE__, __LINE__, "ss", "SSL:",
 847                                                 ERR_error_string(ERR_get_error(), NULL));
 848                                 return -1;
 849                         }
 850                 }
 851
 852                 if (!buffer_string_is_empty(s->ssl_cipher_list)) {
 853                         /* Disable support for low encryption ciphers */
 854                         if (SSL_CTX_set_cipher_list(s->ssl_ctx, s->ssl_cipher_list->ptr) != 1) {
 855                                 log_error_write(srv, __FILE__, __LINE__, "ss", "SSL:",
 856                                                 ERR_error_string(ERR_get_error(), NULL));
 857                                 return -1;
 858                         }
 859
 860                         if (s->ssl_honor_cipher_order) {
 861                                 SSL_CTX_set_options(s->ssl_ctx, SSL_OP_CIPHER_SERVER_PREFERENCE);
 862                         }
 863                 }
 864
 865 #ifndef OPENSSL_NO_DH
 866                 /* Support for Diffie-Hellman key exchange */
 867                 if (!buffer_string_is_empty(s->ssl_dh_file)) {
 868                         /* DH parameters from file */
 869                         bio = BIO_new_file((char *) s->ssl_dh_file->ptr, "r");
 870                         if (bio == NULL) {
 871                                 log_error_write(srv, __FILE__, __LINE__, "ss", "SSL: Unable to open file", s->ssl_dh_file->ptr);
 872                                 return -1;
 873                         }
 874                         dh = PEM_read_bio_DHparams(bio, NULL, NULL, NULL);
 875                         BIO_free(bio);
 876                         if (dh == NULL) {
 877                                 log_error_write(srv, __FILE__, __LINE__, "ss", "SSL: PEM_read_bio_DHparams failed", s->ssl_dh_file->ptr);
 878                                 return -1;
 879                         }
 880                 } else {
 881                         BIGNUM *dh_p, *dh_g;
 882                         /* Default DH parameters from RFC5114 */
 883                         dh = DH_new();
 884                         if (dh == NULL) {
 885                                 log_error_write(srv, __FILE__, __LINE__, "s", "SSL: DH_new () failed");
 886                                 return -1;
 887                         }
 888                         dh_p = BN_bin2bn(dh1024_p,sizeof(dh1024_p), NULL);
 889                         dh_g = BN_bin2bn(dh1024_g,sizeof(dh1024_g), NULL);
 890                         if ((dh_p == NULL) || (dh_g == NULL)) {
 891                                 DH_free(dh);
 892                                 log_error_write(srv, __FILE__, __LINE__, "s", "SSL: BN_bin2bn () failed");
 893                                 return -1;
 894                         }
 895                       #if OPENSSL_VERSION_NUMBER < 0x10100000L \
 896                         || defined(LIBRESSL_VERSION_NUMBER)
 897                         dh->p = dh_p;
 898                         dh->g = dh_g;
 899                         dh->length = 160;
 900                       #else
 901                         DH_set0_pqg(dh, dh_p, NULL, dh_g);
 902                         DH_set_length(dh, 160);
 903                       #endif
 904                 }
 905                 SSL_CTX_set_tmp_dh(s->ssl_ctx,dh);
 906                 SSL_CTX_set_options(s->ssl_ctx,SSL_OP_SINGLE_DH_USE);
 907                 DH_free(dh);
 908 #else
 909                 if (!buffer_string_is_empty(s->ssl_dh_file)) {
 910                         log_error_write(srv, __FILE__, __LINE__, "ss", "SSL: openssl compiled without DH support, can't load parameters from", s->ssl_dh_file->ptr);
 911                 }
 912 #endif
 913
 914 #if OPENSSL_VERSION_NUMBER >= 0x0090800fL
 915 #ifndef OPENSSL_NO_ECDH
 916                 /* Support for Elliptic-Curve Diffie-Hellman key exchange */
 917                 if (!buffer_string_is_empty(s->ssl_ec_curve)) {
 918                         /* OpenSSL only supports the "named curves" from RFC 4492, section 5.1.1. */
 919                         nid = OBJ_sn2nid((char *) s->ssl_ec_curve->ptr);
 920                         if (nid == 0) {
 921                                 log_error_write(srv, __FILE__, __LINE__, "ss", "SSL: Unknown curve name", s->ssl_ec_curve->ptr);
 922                                 return -1;
 923                         }
 924                 } else {
 925                         /* Default curve */
 926                         nid = OBJ_sn2nid("prime256v1");
 927                 }
 928                 ecdh = EC_KEY_new_by_curve_name(nid);
 929                 if (ecdh == NULL) {
 930                         log_error_write(srv, __FILE__, __LINE__, "ss", "SSL: Unable to create curve", s->ssl_ec_curve->ptr);
 931                         return -1;
 932                 }
 933                 SSL_CTX_set_tmp_ecdh(s->ssl_ctx,ecdh);
 934                 SSL_CTX_set_options(s->ssl_ctx,SSL_OP_SINGLE_ECDH_USE);
 935                 EC_KEY_free(ecdh);
 936 #endif
 937 #endif
 938
 939                 /* load all ssl.ca-files specified in the config into each SSL_CTX to be prepared for SNI */
 940                 for (j = 0; j < srv->config_context->used; j++) {
 941                         specific_config *s1 = srv->config_storage[j];
 942
 943                         if (!buffer_string_is_empty(s1->ssl_ca_file)) {
 944                                 if (1 != SSL_CTX_load_verify_locations(s->ssl_ctx, s1->ssl_ca_file->ptr, NULL)) {
 945                                         log_error_write(srv, __FILE__, __LINE__, "ssb", "SSL:",
 946                                                         ERR_error_string(ERR_get_error(), NULL), s1->ssl_ca_file);
 947                                         return -1;
 948                                 }
 949                         }
 950                 }
 951
 952                 if (s->ssl_verifyclient) {
 953                         if (NULL == s->ssl_ca_file_cert_names) {
 954                                 log_error_write(srv, __FILE__, __LINE__, "s",
 955                                         "SSL: You specified ssl.verifyclient.activate but no ca_file"
 956                                 );
 957                                 return -1;
 958                         }
 959                         SSL_CTX_set_client_CA_list(s->ssl_ctx, SSL_dup_CA_list(s->ssl_ca_file_cert_names));
 960                         SSL_CTX_set_verify(
 961                                 s->ssl_ctx,
 962                                 SSL_VERIFY_PEER | (s->ssl_verifyclient_enforce ? SSL_VERIFY_FAIL_IF_NO_PEER_CERT : 0),
 963                                 NULL
 964                         );
 965                         SSL_CTX_set_verify_depth(s->ssl_ctx, s->ssl_verifyclient_depth);
 966                 }
 967
 968                 if (1 != SSL_CTX_use_certificate(s->ssl_ctx, s->ssl_pemfile_x509)) {
 969                         log_error_write(srv, __FILE__, __LINE__, "ssb", "SSL:",
 970                                         ERR_error_string(ERR_get_error(), NULL), s->ssl_pemfile);
 971                         return -1;
 972                 }
 973
 974                 if (1 != SSL_CTX_use_PrivateKey(s->ssl_ctx, s->ssl_pemfile_pkey)) {
 975                         log_error_write(srv, __FILE__, __LINE__, "ssb", "SSL:",
 976                                         ERR_error_string(ERR_get_error(), NULL), s->ssl_pemfile);
 977                         return -1;
 978                 }
 979
 980                 if (SSL_CTX_check_private_key(s->ssl_ctx) != 1) {
 981                         log_error_write(srv, __FILE__, __LINE__, "sssb", "SSL:",
 982                                         "Private key does not match the certificate public key, reason:",
 983                                         ERR_error_string(ERR_get_error(), NULL),
 984                                         s->ssl_pemfile);
 985                         return -1;
 986                 }
 987                 SSL_CTX_set_default_read_ahead(s->ssl_ctx, 1);
 988                 SSL_CTX_set_mode(s->ssl_ctx,  SSL_CTX_get_mode(s->ssl_ctx)
 989                                             | SSL_MODE_ENABLE_PARTIAL_WRITE
 990                                             | SSL_MODE_ACCEPT_MOVING_WRITE_BUFFER
 991                                             | SSL_MODE_RELEASE_BUFFERS);
 992
 993 # ifndef OPENSSL_NO_TLSEXT
 994                 if (!SSL_CTX_set_tlsext_servername_callback(s->ssl_ctx, network_ssl_servername_callback) ||
 995                     !SSL_CTX_set_tlsext_servername_arg(s->ssl_ctx, srv)) {
 996                         log_error_write(srv, __FILE__, __LINE__, "ss", "SSL:",
 997                                         "failed to initialize TLS servername callback, openssl library does not support TLS servername extension");
 998                         return -1;
 999                 }
1000 # endif
1001         }
1002 #endif
1003
1004         b = buffer_init();
1005
1006         buffer_copy_buffer(b, srv->srvconf.bindhost);
1007         buffer_append_string_len(b, CONST_STR_LEN(":"));
1008         buffer_append_int(b, srv->srvconf.port);
1009
1010         if (0 != network_server_init(srv, b, srv->config_storage[0])) {
1011                 buffer_free(b);
1012                 return -1;
1013         }
1014         buffer_free(b);
1015
1016 #ifdef USE_OPENSSL
1017         srv->network_ssl_backend_write = network_write_chunkqueue_openssl;
1018 #endif
1019
1020         /* get a usefull default */
1021         backend = network_backends[0].nb;
1022
1023         /* match name against known types */
1024         if (!buffer_string_is_empty(srv->srvconf.network_backend)) {
1025                 for (i = 0; network_backends[i].name; i++) {
1026                         /**/
1027                         if (buffer_is_equal_string(srv->srvconf.network_backend, network_backends[i].name, strlen(network_backends[i].name))) {
1028                                 backend = network_backends[i].nb;
1029                                 break;
1030                         }
1031                 }
1032                 if (NULL == network_backends[i].name) {
1033                         /* we don't know it */
1034
1035                         log_error_write(srv, __FILE__, __LINE__, "sb",
1036                                         "server.network-backend has a unknown value:",
1037                                         srv->srvconf.network_backend);
1038
1039                         return -1;
1040                 }
1041         }
1042
1043         switch(backend) {
1044         case NETWORK_BACKEND_WRITE:
1045                 srv->network_backend_write = network_write_chunkqueue_write;
1046                 break;
1047 #if defined(USE_WRITEV)
1048         case NETWORK_BACKEND_WRITEV:
1049                 srv->network_backend_write = network_write_chunkqueue_writev;
1050                 break;
1051 #endif
1052 #if defined(USE_SENDFILE)
1053         case NETWORK_BACKEND_SENDFILE:
1054                 srv->network_backend_write = network_write_chunkqueue_sendfile;
1055                 break;
1056 #endif
1057         default:
1058                 return -1;
1059         }
1060
1061         /* check for $SERVER["socket"] */
1062         for (i = 1; i < srv->config_context->used; i++) {
1063                 data_config *dc = (data_config *)srv->config_context->data[i];
1064                 specific_config *s = srv->config_storage[i];
1065
1066                 /* not our stage */
1067                 if (COMP_SERVER_SOCKET != dc->comp) continue;
1068
1069                 if (dc->cond != CONFIG_COND_EQ) continue;
1070
1071                 /* check if we already know this socket,
1072                  * if yes, don't init it */
1073                 for (j = 0; j < srv->srv_sockets.used; j++) {
1074                         if (buffer_is_equal(srv->srv_sockets.ptr[j]->srv_token, dc->string)) {
1075                                 break;
1076                         }
1077                 }
1078
1079                 if (j == srv->srv_sockets.used) {
1080                         if (0 != network_server_init(srv, dc->string, s)) return -1;
1081                 }
1082         }
1083
1084         return 0;
1085 }
1086
1087 int network_register_fdevents(server *srv) {
1088         size_t i;
1089
1090         if (-1 == fdevent_reset(srv->ev)) {
1091                 return -1;
1092         }
1093
1094         if (srv->sockets_disabled) return 0; /* lighttpd -1 (one-shot mode) */
1095
1096         /* register fdevents after reset */
1097         for (i = 0; i < srv->srv_sockets.used; i++) {
1098                 server_socket *srv_socket = srv->srv_sockets.ptr[i];
1099
1100                 fdevent_register(srv->ev, srv_socket->fd, network_server_handle_fdevent, srv_socket);
1101                 fdevent_event_set(srv->ev, &(srv_socket->fde_ndx), srv_socket->fd, FDEVENT_IN);
1102         }
1103         return 0;
1104 }
1105
1106 int network_write_chunkqueue(server *srv, connection *con, chunkqueue *cq, off_t max_bytes) {
1107         int ret = -1;
1108         off_t written = 0;
1109 #ifdef TCP_CORK
1110         int corked = 0;
1111 #endif
1112         server_socket *srv_socket = con->srv_socket;
1113
1114         if (con->conf.global_kbytes_per_second) {
1115                 off_t limit = con->conf.global_kbytes_per_second * 1024 - *(con->conf.global_bytes_per_second_cnt_ptr);
1116                 if (limit <= 0) {
1117                         /* we reached the global traffic limit */
1118                         con->traffic_limit_reached = 1;
1119
1120                         return 1;
1121                 } else {
1122                         if (max_bytes > limit) max_bytes = limit;
1123                 }
1124         }
1125
1126         if (con->conf.kbytes_per_second) {
1127                 off_t limit = con->conf.kbytes_per_second * 1024 - con->bytes_written_cur_second;
1128                 if (limit <= 0) {
1129                         /* we reached the traffic limit */
1130                         con->traffic_limit_reached = 1;
1131
1132                         return 1;
1133                 } else {
1134                         if (max_bytes > limit) max_bytes = limit;
1135                 }
1136         }
1137
1138         written = cq->bytes_out;
1139
1140 #ifdef TCP_CORK
1141         /* Linux: put a cork into the socket as we want to combine the write() calls
1142          * but only if we really have multiple chunks
1143          */
1144         if (cq->first && cq->first->next) {
1145                 corked = 1;
1146                 (void)setsockopt(con->fd, IPPROTO_TCP, TCP_CORK, &corked, sizeof(corked));
1147         }
1148 #endif
1149
1150         if (srv_socket->is_ssl) {
1151 #ifdef USE_OPENSSL
1152                 ret = srv->network_ssl_backend_write(srv, con, con->ssl, cq, max_bytes);
1153 #endif
1154         } else {
1155                 ret = srv->network_backend_write(srv, con, con->fd, cq, max_bytes);
1156         }
1157
1158         if (ret >= 0) {
1159                 chunkqueue_remove_finished_chunks(cq);
1160                 ret = chunkqueue_is_empty(cq) ? 0 : 1;
1161         }
1162
1163 #ifdef TCP_CORK
1164         if (corked) {
1165                 corked = 0;
1166                 (void)setsockopt(con->fd, IPPROTO_TCP, TCP_CORK, &corked, sizeof(corked));
1167         }
1168 #endif
1169
1170         written = cq->bytes_out - written;
1171         con->bytes_written += written;
1172         con->bytes_written_cur_second += written;
1173
1174         *(con->conf.global_bytes_per_second_cnt_ptr) += written;
1175
1176         return ret;
1177 }