src/network.c

   1 #include "first.h"
   2
   3 #include "network.h"
   4 #include "base.h"
   5 #include "fdevent.h"
   6 #include "log.h"
   7 #include "connections.h"
   8 #include "configfile.h"
   9 #include "sock_addr.h"
  10
  11 #include "network_write.h"
  12 #include "sys-socket.h"
  13
  14 #include <sys/types.h>
  15 #include <sys/stat.h>
  16 #include <sys/time.h>
  17
  18 #include <errno.h>
  19 #include <fcntl.h>
  20 #include <unistd.h>
  21 #include <string.h>
  22 #include <stdlib.h>
  23
  24 void
  25 network_accept_tcp_nagle_disable (const int fd)
  26 {
  27     static int noinherit_tcpnodelay = -1;
  28     int opt;
  29
  30     if (!noinherit_tcpnodelay) /* TCP_NODELAY inherited from listen socket */
  31         return;
  32
  33     if (noinherit_tcpnodelay < 0) {
  34         socklen_t optlen = sizeof(opt);
  35         if (0 == getsockopt(fd, IPPROTO_TCP, TCP_NODELAY, &opt, &optlen)) {
  36             noinherit_tcpnodelay = !opt;
  37             if (opt)           /* TCP_NODELAY inherited from listen socket */
  38                 return;
  39         }
  40     }
  41
  42     opt = 1;
  43     (void)setsockopt(fd, IPPROTO_TCP, TCP_NODELAY, &opt, sizeof(opt));
  44 }
  45
  46 static handler_t network_server_handle_fdevent(server *srv, void *context, int revents) {
  47         server_socket *srv_socket = (server_socket *)context;
  48         connection *con;
  49         int loops = 0;
  50
  51         UNUSED(context);
  52
  53         if (0 == (revents & FDEVENT_IN)) {
  54                 log_error_write(srv, __FILE__, __LINE__, "sdd",
  55                                 "strange event for server socket",
  56                                 srv_socket->fd,
  57                                 revents);
  58                 return HANDLER_ERROR;
  59         }
  60
  61         /* accept()s at most 100 connections directly
  62          *
  63          * we jump out after 100 to give the waiting connections a chance */
  64         for (loops = 0; loops < 100 && NULL != (con = connection_accept(srv, srv_socket)); loops++) {
  65                 connection_state_machine(srv, con);
  66         }
  67         return HANDLER_GO_ON;
  68 }
  69
  70 static void network_host_normalize_addr_str(buffer *host, sock_addr *addr) {
  71     buffer_clear(host);
  72     sock_addr_stringify_append_buffer(host, addr);
  73 }
  74
  75 static int network_host_parse_addr(server *srv, sock_addr *addr, socklen_t *addr_len, buffer *host, int use_ipv6) {
  76     char *h;
  77     char *colon = NULL;
  78     const char *chost;
  79     sa_family_t family = use_ipv6 ? AF_INET6 : AF_INET;
  80     unsigned int port = srv->srvconf.port;
  81     if (buffer_string_is_empty(host)) {
  82         log_error_write(srv, __FILE__, __LINE__, "s", "value of $SERVER[\"socket\"] must not be empty");
  83         return -1;
  84     }
  85     h = host->ptr;
  86     if (h[0] == '/') {
  87       #ifdef HAVE_SYS_UN_H
  88         return (1 == sock_addr_from_str_hints(srv,addr,addr_len,h,AF_UNIX,0))
  89           ? 0
  90           : -1;
  91       #else
  92         log_error_write(srv, __FILE__, __LINE__, "s",
  93                         "ERROR: Unix Domain sockets are not supported.");
  94         return -1;
  95       #endif
  96     }
  97     buffer_copy_buffer(srv->tmp_buf, host);
  98     h = srv->tmp_buf->ptr;
  99     if (h[0] == '[') {
 100         family = AF_INET6;
 101         if ((h = strchr(h, ']'))) {
 102             *h++ = '\0';
 103             if (*h == ':') colon = h;
 104         } /*(else should not happen; validated in configparser.y)*/
 105         h = srv->tmp_buf->ptr+1;
 106     }
 107     else {
 108         colon = strrchr(h, ':');
 109     }
 110     if (colon) {
 111         *colon++ = '\0';
 112         port = strtol(colon, NULL, 10);
 113         if (port == 0 || port > 65535) {
 114             log_error_write(srv, __FILE__, __LINE__, "sd",
 115                             "port not set or out of range:", port);
 116             return -1;
 117         }
 118     }
 119     chost = *h ? h : family == AF_INET ? "0.0.0.0" : "::";
 120     if (1 != sock_addr_from_str_hints(srv,addr,addr_len,chost,family,port)) {
 121         return -1;
 122     }
 123     return 0;
 124 }
 125
 126 static void network_srv_sockets_append(server *srv, server_socket *srv_socket) {
 127         if (srv->srv_sockets.used == srv->srv_sockets.size) {
 128                 srv->srv_sockets.size += 4;
 129                 srv->srv_sockets.ptr = realloc(srv->srv_sockets.ptr, srv->srv_sockets.size * sizeof(server_socket*));
 130                 force_assert(NULL != srv->srv_sockets.ptr);
 131         }
 132
 133         srv->srv_sockets.ptr[srv->srv_sockets.used++] = srv_socket;
 134 }
 135
 136 static int network_server_init(server *srv, buffer *host_token, size_t sidx, int stdin_fd) {
 137         server_socket *srv_socket;
 138         const char *host;
 139         specific_config *s = srv->config_storage[sidx];
 140         socklen_t addr_len = sizeof(sock_addr);
 141         sock_addr addr;
 142         int family = 0;
 143         int set_v6only = 0;
 144
 145         if (buffer_string_is_empty(host_token)) {
 146                 log_error_write(srv, __FILE__, __LINE__, "s", "value of $SERVER[\"socket\"] must not be empty");
 147                 return -1;
 148         }
 149
 150         /* check if we already know this socket, and if yes, don't init it
 151          * (optimization: check strings here to filter out exact matches;
 152          *  binary addresses are matched further below) */
 153         for (size_t i = 0; i < srv->srv_sockets.used; ++i) {
 154                 if (buffer_is_equal(srv->srv_sockets.ptr[i]->srv_token, host_token)) {
 155                         buffer_copy_buffer(host_token, srv->srv_sockets.ptr[i]->srv_token);
 156                         return 0;
 157                 }
 158         }
 159
 160         host = host_token->ptr;
 161         if ((s->use_ipv6 && (*host == '\0' || *host == ':')) || (host[0] == '[' && host[1] == ']')) {
 162                         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");
 163         }
 164         if (*host == '[') s->use_ipv6 = 1;
 165
 166         memset(&addr, 0, sizeof(addr));
 167         if (-1 != stdin_fd) {
 168                 if (-1 == getsockname(stdin_fd, (struct sockaddr *)&addr, &addr_len)) {
 169                         log_error_write(srv, __FILE__, __LINE__, "ss",
 170                                         "getsockname()", strerror(errno));
 171                         return -1;
 172                 }
 173         } else if (0 != network_host_parse_addr(srv, &addr, &addr_len, host_token, s->use_ipv6)) {
 174                 return -1;
 175         }
 176
 177         family = sock_addr_get_family(&addr);
 178
 179       #ifdef HAVE_IPV6
 180         if (*host != '\0' && AF_INET6 == family) {
 181                 if (s->set_v6only) {
 182                         set_v6only = 1;
 183                 } else {
 184                         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");
 185                 }
 186         }
 187       #endif
 188
 189         network_host_normalize_addr_str(host_token, &addr);
 190         host = host_token->ptr;
 191
 192         if (srv->srvconf.preflight_check) {
 193                 return 0;
 194         }
 195
 196         /* check if we already know this socket (after potential DNS resolution), and if yes, don't init it */
 197         for (size_t i = 0; i < srv->srv_sockets.used; ++i) {
 198                 if (0 == memcmp(&srv->srv_sockets.ptr[i]->addr, &addr, sizeof(addr))) {
 199                         return 0;
 200                 }
 201         }
 202
 203         srv_socket = calloc(1, sizeof(*srv_socket));
 204         force_assert(NULL != srv_socket);
 205         memcpy(&srv_socket->addr, &addr, addr_len);
 206         srv_socket->fd = -1;
 207         srv_socket->sidx = sidx;
 208         srv_socket->is_ssl = s->ssl_enabled;
 209         srv_socket->srv_token = buffer_init_buffer(host_token);
 210
 211         network_srv_sockets_append(srv, srv_socket);
 212
 213         if (srv->sockets_disabled) { /* lighttpd -1 (one-shot mode) */
 214                 return 0;
 215         }
 216
 217         if (srv->srvconf.systemd_socket_activation) {
 218                 for (size_t i = 0; i < srv->srv_sockets_inherited.used; ++i) {
 219                         if (0 != memcmp(&srv->srv_sockets_inherited.ptr[i]->addr, &srv_socket->addr, addr_len)) continue;
 220                         if ((unsigned short)~0u == srv->srv_sockets_inherited.ptr[i]->sidx) {
 221                                 srv->srv_sockets_inherited.ptr[i]->sidx = sidx;
 222                         }
 223                         stdin_fd = srv->srv_sockets_inherited.ptr[i]->fd;
 224                         break;
 225                 }
 226         }
 227
 228         if (-1 != stdin_fd) {
 229                 srv_socket->fd = stdin_fd;
 230                 if (-1 == fdevent_fcntl_set_nb_cloexec(srv->ev, stdin_fd)) {
 231                         log_error_write(srv, __FILE__, __LINE__, "ss", "fcntl:", strerror(errno));
 232                         return -1;
 233                 }
 234         } else
 235 #ifdef HAVE_SYS_UN_H
 236         if (AF_UNIX == family) {
 237                 /* check if the socket exists and try to connect to it. */
 238                 force_assert(host); /*(static analysis hint)*/
 239                 if (-1 == (srv_socket->fd = fdevent_socket_cloexec(AF_UNIX, SOCK_STREAM, 0))) {
 240                         log_error_write(srv, __FILE__, __LINE__, "ss", "socket failed:", strerror(errno));
 241                         return -1;
 242                 }
 243                 if (0 == connect(srv_socket->fd, (struct sockaddr *) &(srv_socket->addr), addr_len)) {
 244                         log_error_write(srv, __FILE__, __LINE__, "ss",
 245                                 "server socket is still in use:",
 246                                 host);
 247
 248
 249                         return -1;
 250                 }
 251
 252                 /* connect failed */
 253                 switch(errno) {
 254                 case ECONNREFUSED:
 255                         unlink(host);
 256                         break;
 257                 case ENOENT:
 258                         break;
 259                 default:
 260                         log_error_write(srv, __FILE__, __LINE__, "sds",
 261                                 "testing socket failed:",
 262                                 host, strerror(errno));
 263
 264                         return -1;
 265                 }
 266
 267                 if (-1 == fdevent_fcntl_set_nb(srv->ev, srv_socket->fd)) {
 268                         log_error_write(srv, __FILE__, __LINE__, "ss", "fcntl:", strerror(errno));
 269                         return -1;
 270                 }
 271         } else
 272 #endif
 273         {
 274                 if (-1 == (srv_socket->fd = fdevent_socket_nb_cloexec(family, SOCK_STREAM, IPPROTO_TCP))) {
 275                         log_error_write(srv, __FILE__, __LINE__, "ss", "socket failed:", strerror(errno));
 276                         return -1;
 277                 }
 278         }
 279
 280 #ifdef HAVE_IPV6
 281                 if (set_v6only && -1 == stdin_fd) {
 282                                 int val = 1;
 283                                 if (-1 == setsockopt(srv_socket->fd, IPPROTO_IPV6, IPV6_V6ONLY, &val, sizeof(val))) {
 284                                         log_error_write(srv, __FILE__, __LINE__, "ss", "setsockopt(IPV6_V6ONLY) failed:", strerror(errno));
 285                                         return -1;
 286                                 }
 287                 }
 288 #endif
 289
 290         /* */
 291         srv->cur_fds = srv_socket->fd;
 292
 293         if (fdevent_set_so_reuseaddr(srv_socket->fd, 1) < 0) {
 294                 log_error_write(srv, __FILE__, __LINE__, "ss", "setsockopt(SO_REUSEADDR) failed:", strerror(errno));
 295                 return -1;
 296         }
 297
 298         if (family != AF_UNIX) {
 299                 if (fdevent_set_tcp_nodelay(srv_socket->fd, 1) < 0) {
 300                         log_error_write(srv, __FILE__, __LINE__, "ss", "setsockopt(TCP_NODELAY) failed:", strerror(errno));
 301                         return -1;
 302                 }
 303         }
 304
 305         if (-1 != stdin_fd) { } else
 306         if (0 != bind(srv_socket->fd, (struct sockaddr *) &(srv_socket->addr), addr_len)) {
 307                 log_error_write(srv, __FILE__, __LINE__, "sss",
 308                                 "can't bind to socket:", host, strerror(errno));
 309                 return -1;
 310         }
 311
 312         if (-1 != stdin_fd) { } else
 313         if (AF_UNIX == family && !buffer_string_is_empty(s->socket_perms)) {
 314                 mode_t m = 0;
 315                 for (char *str = s->socket_perms->ptr; *str; ++str) {
 316                         m <<= 3;
 317                         m |= (*str - '0');
 318                 }
 319                 if (0 != m && -1 == chmod(host, m)) {
 320                         log_error_write(srv, __FILE__, __LINE__, "sssbss", "chmod(\"", host, "\", ", s->socket_perms, "):", strerror(errno));
 321                 }
 322         }
 323
 324         if (-1 != stdin_fd) { } else
 325         if (-1 == listen(srv_socket->fd, s->listen_backlog)) {
 326                 log_error_write(srv, __FILE__, __LINE__, "ss", "listen failed: ", strerror(errno));
 327                 return -1;
 328         }
 329
 330         if (s->ssl_enabled) {
 331 #ifdef TCP_DEFER_ACCEPT
 332         } else if (s->defer_accept) {
 333                 int v = s->defer_accept;
 334                 if (-1 == setsockopt(srv_socket->fd, IPPROTO_TCP, TCP_DEFER_ACCEPT, &v, sizeof(v))) {
 335                         log_error_write(srv, __FILE__, __LINE__, "ss", "can't set TCP_DEFER_ACCEPT: ", strerror(errno));
 336                 }
 337 #endif
 338 #if defined(__FreeBSD__) || defined(__NetBSD__) \
 339  || defined(__OpenBSD__) || defined(__DragonFly__)
 340         } else if (!buffer_is_empty(s->bsd_accept_filter)
 341                    && (buffer_is_equal_string(s->bsd_accept_filter, CONST_STR_LEN("httpready"))
 342                         || buffer_is_equal_string(s->bsd_accept_filter, CONST_STR_LEN("dataready")))) {
 343 #ifdef SO_ACCEPTFILTER
 344                 /* FreeBSD accf_http filter */
 345                 struct accept_filter_arg afa;
 346                 memset(&afa, 0, sizeof(afa));
 347                 strncpy(afa.af_name, s->bsd_accept_filter->ptr, sizeof(afa.af_name));
 348                 if (setsockopt(srv_socket->fd, SOL_SOCKET, SO_ACCEPTFILTER, &afa, sizeof(afa)) < 0) {
 349                         if (errno != ENOENT) {
 350                                 log_error_write(srv, __FILE__, __LINE__, "SBss", "can't set accept-filter '", s->bsd_accept_filter, "':", strerror(errno));
 351                         }
 352                 }
 353 #endif
 354 #endif
 355         }
 356
 357         return 0;
 358 }
 359
 360 int network_close(server *srv) {
 361         size_t i;
 362         for (i = 0; i < srv->srv_sockets.used; i++) {
 363                 server_socket *srv_socket = srv->srv_sockets.ptr[i];
 364                 if (srv_socket->fd != -1) {
 365                         network_unregister_sock(srv, srv_socket);
 366                         close(srv_socket->fd);
 367                 }
 368
 369                 buffer_free(srv_socket->srv_token);
 370
 371                 free(srv_socket);
 372         }
 373
 374         free(srv->srv_sockets.ptr);
 375         srv->srv_sockets.ptr = NULL;
 376         srv->srv_sockets.used = 0;
 377         srv->srv_sockets.size = 0;
 378
 379         for (i = 0; i < srv->srv_sockets_inherited.used; i++) {
 380                 server_socket *srv_socket = srv->srv_sockets_inherited.ptr[i];
 381                 if (srv_socket->fd != -1 && srv_socket->sidx != (unsigned short)~0u) {
 382                         close(srv_socket->fd);
 383                 }
 384
 385                 buffer_free(srv_socket->srv_token);
 386
 387                 free(srv_socket);
 388         }
 389
 390         free(srv->srv_sockets_inherited.ptr);
 391         srv->srv_sockets_inherited.ptr = NULL;
 392         srv->srv_sockets_inherited.used = 0;
 393         srv->srv_sockets_inherited.size = 0;
 394
 395         return 0;
 396 }
 397
 398 static int network_socket_activation_nfds(server *srv, int nfds) {
 399     buffer *host = buffer_init();
 400     socklen_t addr_len;
 401     sock_addr addr;
 402     int rc = 0;
 403     nfds += 3; /* #define SD_LISTEN_FDS_START 3 */
 404     for (int fd = 3; fd < nfds; ++fd) {
 405         addr_len = sizeof(sock_addr);
 406         if (-1 == (rc = getsockname(fd, (struct sockaddr *)&addr, &addr_len))) {
 407             log_error_write(srv, __FILE__, __LINE__, "ss",
 408                             "socket activation getsockname()", strerror(errno));
 409             break;
 410         }
 411         network_host_normalize_addr_str(host, &addr);
 412         rc = network_server_init(srv, host, 0, fd);
 413         if (0 != rc) break;
 414         srv->srv_sockets.ptr[srv->srv_sockets.used-1]->sidx = (unsigned short)~0u;
 415     }
 416     buffer_free(host);
 417     memcpy(&srv->srv_sockets_inherited, &srv->srv_sockets, sizeof(server_socket_array));
 418     memset(&srv->srv_sockets, 0, sizeof(server_socket_array));
 419     return rc;
 420 }
 421
 422 static int network_socket_activation_from_env(server *srv) {
 423     char *listen_pid = getenv("LISTEN_PID");
 424     char *listen_fds = getenv("LISTEN_FDS");
 425     pid_t lpid = listen_pid ? (pid_t)strtoul(listen_pid,NULL,10) : 0;
 426     int nfds = listen_fds ? atoi(listen_fds) : 0;
 427     int rc = (lpid == getpid() && nfds > 0)
 428       ? network_socket_activation_nfds(srv, nfds)
 429       : 0;
 430     unsetenv("LISTEN_PID");
 431     unsetenv("LISTEN_FDS");
 432     unsetenv("LISTEN_FDNAMES");
 433     /*(upon graceful restart, unsetenv will result in no-op above)*/
 434     return rc;
 435 }
 436
 437 int network_init(server *srv, int stdin_fd) {
 438       #ifdef __WIN32
 439         WSADATA wsaData;
 440         WORD wVersionRequested = MAKEWORD(2, 2);
 441         if (0 != WSAStartup(wVersionRequested, &wsaData)) {
 442                 /* Tell the user that we could not find a usable WinSock DLL */
 443                 return -1;
 444         }
 445       #endif
 446
 447         if (0 != network_write_init(srv)) return -1;
 448
 449         if (srv->srvconf.systemd_socket_activation) {
 450                 for (size_t i = 0; i < srv->srv_sockets_inherited.used; ++i) {
 451                         srv->srv_sockets_inherited.ptr[i]->sidx = (unsigned short)~0u;
 452                 }
 453                 if (0 != network_socket_activation_from_env(srv)) return -1;
 454                 if (0 == srv->srv_sockets_inherited.used) {
 455                         srv->srvconf.systemd_socket_activation = 0;
 456                 }
 457         }
 458
 459         /* process srv->srvconf.bindhost
 460          * (skip if systemd socket activation is enabled and bindhost is empty; do not additionally listen on "*") */
 461         if (!srv->srvconf.systemd_socket_activation || !buffer_string_is_empty(srv->srvconf.bindhost)) {
 462                 int rc;
 463                 buffer *b = buffer_init();
 464                 buffer_copy_buffer(b, srv->srvconf.bindhost);
 465                 if (b->ptr[0] != '/') { /*(skip adding port if unix socket path)*/
 466                         buffer_append_string_len(b, CONST_STR_LEN(":"));
 467                         buffer_append_int(b, srv->srvconf.port);
 468                 }
 469
 470                 rc = (-1 == stdin_fd || 0 == srv->srv_sockets.used)
 471                   ? network_server_init(srv, b, 0, stdin_fd)
 472                   : close(stdin_fd);/*(graceful restart listening to "/dev/stdin")*/
 473                 buffer_free(b);
 474                 if (0 != rc) return -1;
 475         }
 476
 477         /* check for $SERVER["socket"] */
 478         for (size_t i = 1; i < srv->config_context->used; ++i) {
 479                 data_config *dc = (data_config *)srv->config_context->data[i];
 480
 481                 /* not our stage */
 482                 if (COMP_SERVER_SOCKET != dc->comp) continue;
 483
 484                 if (dc->cond == CONFIG_COND_NE) {
 485                         socklen_t addr_len = sizeof(sock_addr);
 486                         sock_addr addr;
 487                         if (0 != network_host_parse_addr(srv, &addr, &addr_len, dc->string, srv->config_storage[i]->use_ipv6)) {
 488                                 return -1;
 489                         }
 490                         network_host_normalize_addr_str(dc->string, &addr);
 491                         continue;
 492                 }
 493
 494                 if (dc->cond != CONFIG_COND_EQ) continue;
 495
 496                         if (0 != network_server_init(srv, dc->string, i, -1)) return -1;
 497         }
 498
 499         if (srv->srvconf.systemd_socket_activation) {
 500                 /* activate any inherited sockets not explicitly listed in config file */
 501                 server_socket *srv_socket;
 502                 for (size_t i = 0; i < srv->srv_sockets_inherited.used; ++i) {
 503                         if ((unsigned short)~0u != srv->srv_sockets_inherited.ptr[i]->sidx) continue;
 504                         srv->srv_sockets_inherited.ptr[i]->sidx = 0;
 505                         srv_socket = calloc(1, sizeof(server_socket));
 506                         force_assert(NULL != srv_socket);
 507                         memcpy(srv_socket, srv->srv_sockets_inherited.ptr[i], sizeof(server_socket));
 508                         network_srv_sockets_append(srv, srv_socket);
 509                 }
 510         }
 511
 512         return 0;
 513 }
 514
 515 void network_unregister_sock(server *srv, server_socket *srv_socket) {
 516         fdnode *fdn = srv_socket->fdn;
 517         if (NULL == fdn) return;
 518         fdevent_fdnode_event_del(srv->ev, fdn);
 519         fdevent_unregister(srv->ev, fdn->fd);
 520         srv_socket->fdn = NULL;
 521 }
 522
 523 int network_register_fdevents(server *srv) {
 524         size_t i;
 525
 526         if (-1 == fdevent_reset(srv->ev)) {
 527                 return -1;
 528         }
 529
 530         if (srv->sockets_disabled) return 0; /* lighttpd -1 (one-shot mode) */
 531
 532         /* register fdevents after reset */
 533         for (i = 0; i < srv->srv_sockets.used; i++) {
 534                 server_socket *srv_socket = srv->srv_sockets.ptr[i];
 535
 536                 srv_socket->fdn = fdevent_register(srv->ev, srv_socket->fd, network_server_handle_fdevent, srv_socket);
 537                 fdevent_fdnode_event_set(srv->ev, srv_socket->fdn, FDEVENT_IN);
 538         }
 539         return 0;
 540 }