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 "plugin.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(void *context, int revents) { 47 const server_socket * const srv_socket = (server_socket *)context; 48 server * const srv = srv_socket->srv; 49 50 if (0 == (revents & FDEVENT_IN)) { 51 log_error(srv->errh, __FILE__, __LINE__, 52 "strange event for server socket %d %d", srv_socket->fd, revents); 53 return HANDLER_ERROR; 54 } 55 56 /* accept()s at most 100 new connections before 57 * jumping out to process events on other connections */ 58 int loops = (int)srv->lim_conns; 59 if (loops > 100) 60 loops = 100; 61 else if (loops <= 0) 62 return HANDLER_GO_ON; 63 64 const int nagle_disable = 65 (sock_addr_get_family(&srv_socket->addr) != AF_UNIX); 66 67 sock_addr addr; 68 size_t addrlen; /*(size_t intentional; not socklen_t)*/ 69 do { 70 addrlen = sizeof(addr); 71 int fd = fdevent_accept_listenfd(srv_socket->fd, 72 (struct sockaddr *)&addr, &addrlen); 73 if (-1 == fd) break; 74 75 if (nagle_disable) 76 network_accept_tcp_nagle_disable(fd); 77 #ifdef HAVE_SYS_UN_H /*(see sock_addr.h)*/ 78 else if (addrlen <= 2) /*(AF_UNIX if !nagle_disable)*/ 79 memcpy(addr.un.sun_path, srv_socket->addr.un.sun_path, 80 srv_socket->srv_token_colon < sizeof(addr.un.sun_path) 81 ? (size_t)srv_socket->srv_token_colon+1 /*(+1 for '\0')*/ 82 : sizeof(addr.un.sun_path));/*(escaped len might be longer)*/ 83 #endif 84 85 connection *con = connection_accepted(srv, srv_socket, &addr, fd); 86 if (__builtin_expect( (!con), 0)) return HANDLER_GO_ON; 87 connection_state_machine(con); 88 } while (--loops); 89 90 if (loops) { 91 switch (errno) { 92 case EAGAIN: 93 #if EWOULDBLOCK != EAGAIN 94 case EWOULDBLOCK: 95 #endif 96 case EINTR: 97 case ECONNABORTED: 98 case EMFILE: 99 break; 100 default: 101 log_perror(srv->errh, __FILE__, __LINE__, "accept()"); 102 } 103 } 104 105 return HANDLER_GO_ON; 106 } 107 108 #ifdef HAVE_SYS_UN_H 109 110 /* abstract socket (Linux, QNX?, Windows 10?) */ 111 112 __attribute_cold__ 113 static void 114 network_abstract_socket_enc (buffer * const restrict abstract, 115 unsigned char * const restrict sun_path, 116 const uint32_t len) 117 { 118 /*(strings needing encoding are expected to be short; 119 * code not written for performance)*/ 120 buffer_clear(abstract); 121 uint32_t n = 0; 122 for (uint32_t i = 0; i < len; ++i) 123 n += (sun_path[i]-20 < 107) ? 1 : 4; 124 char *s = buffer_extend(abstract, n); 125 for (uint32_t i = 0; i < len; ++i) { 126 /* (sun_path[i] >= 20 && sun_path[i] < 127 && sun_path[i] != '\\') */ 127 if (sun_path[i]-20 < 107 && sun_path[i] != '\\') 128 *s++ = ((char *)sun_path)[i]; 129 else { 130 s[0] = '\\'; 131 s[1] = 'x'; 132 s[2] = "0123456789abcdef"[sun_path[i] >> 4]; 133 s[3] = "0123456789abcdef"[sun_path[i] & 0xF]; 134 s += 4; 135 } 136 } 137 } 138 139 __attribute_cold__ 140 static uint32_t 141 network_abstract_socket_dec (const buffer * const restrict abstract, 142 char * const restrict sun_path, 143 const uint32_t plen) 144 { 145 /*(strings expected to begin with "\\x00")*/ 146 /*(strings needing decoding are expected to be short; 147 * code not written for performance)*/ 148 const char *s = abstract->ptr; 149 uint32_t n = 0; 150 for (int hi, lo; *s && n < plen; ++n) { 151 if (s[0] != '\\') 152 sun_path[n] = *s++; 153 else if (s[1] == 'x' 154 && (hi = hex2int(s[2])) != 0xFF 155 && (lo = hex2int(s[3])) != 0xFF) { 156 sun_path[n] = (char)((hi << 4) | lo); 157 s += 4; 158 } 159 else 160 break; 161 } 162 return *s == '\0' ? n : 0; 163 } 164 165 __attribute_cold__ 166 static int 167 network_abstract_socket_parse (const buffer *abstract, 168 sock_addr *addr, socklen_t *addr_len, 169 log_error_st *errh) 170 { 171 /* abstract socket (Linux, QNX?, Windows 10?) */ 172 /*assert(*addr_len >= sizeof(struct sockaddr_un));*/ 173 memset(addr, 0, sizeof(struct sockaddr_un)); 174 addr->un.sun_family = AF_UNIX; 175 uint32_t len = 176 (uint32_t)(*addr_len - offsetof(struct sockaddr_un, sun_path)); 177 if (len > sizeof(addr->un.sun_path)) 178 len = sizeof(addr->un.sun_path); 179 len = network_abstract_socket_dec(abstract, addr->un.sun_path, len); 180 if (len) { 181 *addr_len = offsetof(struct sockaddr_un, sun_path) + len; 182 return 0; 183 } 184 else { 185 log_error(errh, __FILE__, __LINE__, 186 "abstract unix socket filename invalid encoding or too long: %s", 187 abstract->ptr); 188 return -1; 189 } 190 } 191 192 #endif /* HAVE_SYS_UN_H */ 193 194 static void network_host_normalize_addr_str(buffer *host, sock_addr *addr, socklen_t addr_len) { 195 buffer_clear(host); 196 sock_addr_stringify_append_buffer(host, addr); 197 #ifdef HAVE_SYS_UN_H 198 if (AF_UNIX == sock_addr_get_family(addr) && 0 == buffer_clen(host)) 199 network_abstract_socket_enc(host, (unsigned char *)addr->un.sun_path, 200 (uint32_t)(addr_len 201 - offsetof(struct sockaddr_un, sun_path))); 202 #else 203 UNUSED(addr_len); 204 #endif 205 } 206 207 static int network_host_parse_addr(server *srv, sock_addr *addr, socklen_t *addr_len, buffer *host, int use_ipv6) { 208 char *h; 209 char *colon = NULL; 210 const char *chost; 211 sa_family_t family = use_ipv6 ? AF_INET6 : AF_INET; 212 unsigned int port = srv->srvconf.port; 213 if (buffer_is_blank(host)) { 214 log_error(srv->errh, __FILE__, __LINE__, 215 "value of $SERVER[\"socket\"] must not be empty"); 216 return -1; 217 } 218 h = host->ptr; 219 if (h[0] == '/' || h[0] == '\\') { 220 #ifdef HAVE_SYS_UN_H 221 if (h[0] == '\\' && h[1] == 'x' && h[2] == '0' && h[3] == '0') 222 return network_abstract_socket_parse(host,addr,addr_len,srv->errh); 223 return (1 == 224 sock_addr_from_str_hints(addr,addr_len,h,AF_UNIX,0,srv->errh)) 225 ? 0 226 : -1; 227 #else 228 log_error(srv->errh, __FILE__, __LINE__, 229 "ERROR: Unix Domain sockets are not supported."); 230 return -1; 231 #endif 232 } 233 buffer * const tb = srv->tmp_buf; 234 buffer_copy_buffer(tb, host); 235 h = tb->ptr; 236 if (h[0] == '[') { 237 family = AF_INET6; 238 if ((h = strchr(h, ']'))) { 239 *h++ = '\0'; 240 if (*h == ':') colon = h; 241 } /*(else should not happen; validated in configparser.y)*/ 242 h = tb->ptr+1; 243 } 244 else { 245 colon = strrchr(h, ':'); 246 } 247 if (colon) { 248 *colon++ = '\0'; 249 port = (unsigned int)strtol(colon, NULL, 10); 250 if (port == 0 || port > 65535) { 251 log_error(srv->errh, __FILE__, __LINE__, 252 "port not set or out of range: %u", port); 253 return -1; 254 } 255 } 256 if (h[0] == '*' && h[1] == '\0') { 257 family = AF_INET; 258 ++h; 259 } 260 chost = *h ? h : family == AF_INET ? "0.0.0.0" : "::"; 261 if (1 != 262 sock_addr_from_str_hints(addr,addr_len,chost,family,port,srv->errh)) { 263 return -1; 264 } 265 return 0; 266 } 267 268 static void network_srv_sockets_append(server *srv, server_socket *srv_socket) { 269 server_socket_array * const srv_sockets = &srv->srv_sockets; 270 if (!(srv_sockets->used & (4-1))) 271 ck_realloc_u32((void **)&srv_sockets->ptr, srv_sockets->used, 272 4, sizeof(*srv_sockets->ptr)); 273 srv_sockets->ptr[srv_sockets->used++] = srv_socket; 274 } 275 276 typedef struct { 277 /* global or per-socket config; not patched per connection */ 278 int listen_backlog; 279 unsigned char ssl_enabled; 280 unsigned char use_ipv6; 281 unsigned char set_v6only; /* set_v6only is only a temporary option */ 282 unsigned char defer_accept; 283 int8_t v4mapped; 284 const buffer *socket_perms; 285 const buffer *bsd_accept_filter; 286 } network_socket_config; 287 288 typedef struct { 289 PLUGIN_DATA; 290 network_socket_config defaults; 291 network_socket_config conf; 292 } network_plugin_data; 293 294 static void network_merge_config_cpv(network_socket_config * const pconf, const config_plugin_value_t * const cpv) { 295 switch (cpv->k_id) { /* index into static config_plugin_keys_t cpk[] */ 296 case 0: /* ssl.engine */ 297 pconf->ssl_enabled = (0 != cpv->v.u); 298 break; 299 case 1: /* server.listen-backlog */ 300 pconf->listen_backlog = (int)cpv->v.u; 301 break; 302 case 2: /* server.socket-perms */ 303 pconf->socket_perms = cpv->v.b; 304 break; 305 case 3: /* server.bsd-accept-filter */ 306 pconf->bsd_accept_filter = cpv->v.b; 307 break; 308 case 4: /* server.defer-accept */ 309 pconf->defer_accept = (0 != cpv->v.u); 310 break; 311 case 5: /* server.use-ipv6 */ 312 pconf->use_ipv6 = (0 != cpv->v.u); 313 break; 314 case 6: /* server.set-v6only */ 315 pconf->set_v6only = (0 != cpv->v.u); 316 break; 317 case 7: /* server.v4mapped */ 318 pconf->v4mapped = (0 != cpv->v.u); 319 break; 320 default:/* should not happen */ 321 return; 322 } 323 } 324 325 static void network_merge_config(network_socket_config * const pconf, const config_plugin_value_t *cpv) { 326 do { 327 network_merge_config_cpv(pconf, cpv); 328 } while ((++cpv)->k_id != -1); 329 } 330 331 __attribute_pure__ 332 static uint8_t network_srv_token_colon (const buffer * const b) { 333 const char *colon = NULL; 334 const char * const p = b->ptr; 335 if (*p == '[') { 336 colon = strstr(p, "]:"); 337 if (colon) ++colon; 338 } 339 else if (*p != '/') { 340 colon = strchr(p, ':'); 341 } 342 return colon ? (uint8_t)(colon - p) : (uint8_t)buffer_clen(b); 343 } 344 345 static void network_srv_socket_init_token (server_socket * const srv_socket, const buffer * const token) { 346 buffer * const srv_token = srv_socket->srv_token = buffer_init(); 347 buffer_copy_buffer(srv_token, token); 348 #ifdef HAVE_SYS_UN_H 349 /*(srv_socket->addr must have been initialized by caller)*/ 350 if (AF_UNIX == sock_addr_get_family(&srv_socket->addr)) 351 srv_socket->srv_token_colon = buffer_clen(srv_token); 352 else 353 #endif 354 srv_socket->srv_token_colon = network_srv_token_colon(srv_token); 355 } 356 357 static int network_server_init(server *srv, const network_socket_config *s, buffer *host_token, size_t sidx, int stdin_fd) { 358 server_socket *srv_socket; 359 const char *host; 360 socklen_t addr_len = sizeof(sock_addr); 361 sock_addr addr; 362 int family = 0; 363 int use_ipv6 = s->use_ipv6; 364 int set_v6only = 0; 365 366 if (buffer_is_blank(host_token)) { 367 log_error(srv->errh, __FILE__, __LINE__, 368 "value of $SERVER[\"socket\"] must not be empty"); 369 return -1; 370 } 371 372 /* check if we already know this socket, and if yes, don't init it 373 * (optimization: check strings here to filter out exact matches; 374 * binary addresses are matched further below) */ 375 for (uint32_t i = 0; i < srv->srv_sockets.used; ++i) { 376 if (buffer_is_equal(srv->srv_sockets.ptr[i]->srv_token, host_token)) { 377 if ((unsigned short)~0u == srv->srv_sockets.ptr[i]->sidx) { 378 srv->srv_sockets.ptr[i]->sidx = sidx; 379 srv->srv_sockets.ptr[i]->is_ssl = s->ssl_enabled; 380 } 381 return 0; 382 } 383 } 384 385 host = host_token->ptr; 386 if ((use_ipv6 && (*host == '\0' || *host == ':')) || (host[0] == '[' && host[1] == ']')) { 387 log_error(srv->errh, __FILE__, __LINE__, 388 "warning: please use server.use-ipv6 only for hostnames, " 389 "not without server.bind / empty address; your config will " 390 "break if the kernel default for IPV6_V6ONLY changes"); 391 } 392 if (*host == '[') use_ipv6 = 1; 393 394 memset(&addr, 0, sizeof(addr)); 395 if (-1 != stdin_fd) { 396 if (-1 == getsockname(stdin_fd, (struct sockaddr *)&addr, &addr_len)) { 397 log_perror(srv->errh, __FILE__, __LINE__, "getsockname()"); 398 return -1; 399 } 400 } else if (0 != network_host_parse_addr(srv, &addr, &addr_len, host_token, use_ipv6)) { 401 return -1; 402 } 403 404 family = sock_addr_get_family(&addr); 405 406 #ifdef HAVE_IPV6 407 if (*host != '\0' && AF_INET6 == family) { 408 if (s->set_v6only) { 409 set_v6only = 1; 410 } else { 411 log_error(srv->errh, __FILE__, __LINE__, 412 "warning: server.set-v6only will be removed soon, " 413 "update your config to have different sockets for ipv4 and ipv6"); 414 } 415 } 416 if (AF_INET6 == family && -1 != s->v4mapped) { /*(configured; -1 is unset)*/ 417 set_v6only = (s->v4mapped ? -1 : 1); 418 } 419 #endif 420 421 network_host_normalize_addr_str(host_token, &addr, addr_len); 422 host = host_token->ptr; 423 424 if (srv->srvconf.preflight_check) { 425 return 0; 426 } 427 428 /* check if we already know this socket (after potential DNS resolution), and if yes, don't init it */ 429 for (uint32_t i = 0; i < srv->srv_sockets.used; ++i) { 430 if (0 == memcmp(&srv->srv_sockets.ptr[i]->addr, &addr, sizeof(addr))) { 431 if ((unsigned short)~0u == srv->srv_sockets.ptr[i]->sidx) { 432 srv->srv_sockets.ptr[i]->sidx = sidx; 433 srv->srv_sockets.ptr[i]->is_ssl = s->ssl_enabled; 434 } 435 return 0; 436 } 437 } 438 439 srv_socket = ck_calloc(1, sizeof(*srv_socket)); 440 memcpy(&srv_socket->addr, &addr, addr_len); 441 srv_socket->fd = -1; 442 srv_socket->sidx = sidx; 443 srv_socket->is_ssl = s->ssl_enabled; 444 srv_socket->srv = srv; 445 network_srv_socket_init_token(srv_socket, host_token); 446 network_srv_sockets_append(srv, srv_socket); 447 448 if (srv->sockets_disabled) { /* lighttpd -1 (one-shot mode) */ 449 return 0; 450 } 451 452 if (srv->srvconf.systemd_socket_activation) { 453 for (uint32_t i = 0; i < srv->srv_sockets_inherited.used; ++i) { 454 if (0 != memcmp(&srv->srv_sockets_inherited.ptr[i]->addr, &srv_socket->addr, addr_len)) continue; 455 if ((unsigned short)~0u == srv->srv_sockets_inherited.ptr[i]->sidx) { 456 srv->srv_sockets_inherited.ptr[i]->sidx = sidx; 457 } 458 stdin_fd = srv->srv_sockets_inherited.ptr[i]->fd; 459 break; 460 } 461 } 462 463 if (-1 != stdin_fd) { 464 srv_socket->fd = stdin_fd; 465 if (-1 == fdevent_fcntl_set_nb_cloexec(stdin_fd)) { 466 log_perror(srv->errh, __FILE__, __LINE__, "fcntl"); 467 return -1; 468 } 469 } else 470 #ifdef HAVE_SYS_UN_H 471 if (AF_UNIX == family) { 472 /* check if the socket exists and try to connect to it. */ 473 force_assert(host); /*(static analysis hint)*/ 474 if (-1 == (srv_socket->fd = fdevent_socket_cloexec(AF_UNIX, SOCK_STREAM, 0))) { 475 log_perror(srv->errh, __FILE__, __LINE__, "socket"); 476 return -1; 477 } 478 if (0 == connect(srv_socket->fd, (struct sockaddr *) &(srv_socket->addr), addr_len)) { 479 log_error(srv->errh, __FILE__, __LINE__, 480 "server socket is still in use: %s", host); 481 return -1; 482 } 483 484 /* connect failed */ 485 switch(errno) { 486 case ECONNREFUSED: 487 if (*host == '/') unlink(host); 488 break; 489 case ENOENT: 490 break; 491 default: 492 log_perror(srv->errh, __FILE__, __LINE__, 493 "testing socket failed: %s", host); 494 return -1; 495 } 496 497 if (-1 == fdevent_fcntl_set_nb(srv_socket->fd)) { 498 log_perror(srv->errh, __FILE__, __LINE__, "fcntl"); 499 return -1; 500 } 501 } else 502 #endif 503 { 504 if (-1 == (srv_socket->fd = fdevent_socket_nb_cloexec(family, SOCK_STREAM, IPPROTO_TCP))) { 505 log_perror(srv->errh, __FILE__, __LINE__, "socket"); 506 return -1; 507 } 508 509 #ifdef HAVE_IPV6 510 if (set_v6only) { 511 int val = (set_v6only > 0); 512 if (-1 == setsockopt(srv_socket->fd, IPPROTO_IPV6, IPV6_V6ONLY, &val, sizeof(val))) { 513 log_perror(srv->errh, __FILE__, __LINE__, "setsockopt(IPV6_V6ONLY)"); 514 return -1; 515 } 516 } 517 #endif 518 } 519 520 /* */ 521 srv->cur_fds = srv_socket->fd; 522 523 if (fdevent_set_so_reuseaddr(srv_socket->fd, 1) < 0) { 524 log_perror(srv->errh, __FILE__, __LINE__, "setsockopt(SO_REUSEADDR)"); 525 return -1; 526 } 527 528 if (family != AF_UNIX) { 529 if (fdevent_set_tcp_nodelay(srv_socket->fd, 1) < 0) { 530 log_perror(srv->errh, __FILE__, __LINE__, "setsockopt(TCP_NODELAY)"); 531 return -1; 532 } 533 } 534 535 if (-1 != stdin_fd) { } else 536 if (0 != bind(srv_socket->fd, (struct sockaddr *) &(srv_socket->addr), addr_len)) { 537 log_perror(srv->errh, __FILE__, __LINE__, 538 "can't bind to socket: %s", host); 539 return -1; 540 } 541 542 #ifdef HAVE_SYS_UN_H 543 if (-1 != stdin_fd) { } else 544 if (AF_UNIX == family && s->socket_perms) { 545 mode_t m = 0; 546 for (char *str = s->socket_perms->ptr; *str; ++str) { 547 m <<= 3; 548 m |= (*str - '0'); 549 } 550 if (0 != m && *host == '/' && -1 == chmod(host, m)) { 551 log_perror(srv->errh, __FILE__, __LINE__, 552 "chmod(\"%s\", %s)", host, s->socket_perms->ptr); 553 return -1; 554 } 555 } 556 #endif 557 558 if (-1 != stdin_fd) { } else 559 if (-1 == listen(srv_socket->fd, s->listen_backlog)) { 560 log_perror(srv->errh, __FILE__, __LINE__, "listen"); 561 return -1; 562 } 563 564 if (s->ssl_enabled) { 565 } 566 #ifdef TCP_DEFER_ACCEPT 567 else if (s->defer_accept) { 568 int v = s->defer_accept; 569 if (-1 == setsockopt(srv_socket->fd, IPPROTO_TCP, TCP_DEFER_ACCEPT, &v, sizeof(v))) { 570 log_perror(srv->errh, __FILE__, __LINE__, "can't set TCP_DEFER_ACCEPT"); 571 } 572 } 573 #endif 574 #if defined(__FreeBSD__) || defined(__NetBSD__) \ 575 || defined(__OpenBSD__) || defined(__DragonFly__) 576 #ifdef SO_ACCEPTFILTER 577 else if (s->bsd_accept_filter 578 && (buffer_is_equal_string(s->bsd_accept_filter, CONST_STR_LEN("httpready")) 579 || buffer_is_equal_string(s->bsd_accept_filter, CONST_STR_LEN("dataready")))) { 580 /* FreeBSD accf_http filter */ 581 struct accept_filter_arg afa; 582 memset(&afa, 0, sizeof(afa)); 583 strncpy(afa.af_name, s->bsd_accept_filter->ptr, sizeof(afa.af_name)-1); 584 if (setsockopt(srv_socket->fd, SOL_SOCKET, SO_ACCEPTFILTER, &afa, sizeof(afa)) < 0) { 585 if (errno != ENOENT) { 586 log_perror(srv->errh, __FILE__, __LINE__, 587 "can't set accept-filter '%s'", s->bsd_accept_filter->ptr); 588 } 589 } 590 } 591 #endif 592 #endif 593 594 return 0; 595 } 596 597 int network_close(server *srv) { 598 for (uint32_t i = 0; i < srv->srv_sockets.used; ++i) { 599 server_socket *srv_socket = srv->srv_sockets.ptr[i]; 600 if (srv_socket->fd != -1) { 601 network_unregister_sock(srv, srv_socket); 602 close(srv_socket->fd); 603 } 604 605 buffer_free(srv_socket->srv_token); 606 607 free(srv_socket); 608 } 609 610 free(srv->srv_sockets.ptr); 611 srv->srv_sockets.ptr = NULL; 612 srv->srv_sockets.used = 0; 613 614 for (uint32_t i = 0; i < srv->srv_sockets_inherited.used; ++i) { 615 server_socket *srv_socket = srv->srv_sockets_inherited.ptr[i]; 616 if (srv_socket->fd != -1 && srv_socket->sidx != (unsigned short)~0u) { 617 close(srv_socket->fd); 618 } 619 620 buffer_free(srv_socket->srv_token); 621 622 free(srv_socket); 623 } 624 625 free(srv->srv_sockets_inherited.ptr); 626 srv->srv_sockets_inherited.ptr = NULL; 627 srv->srv_sockets_inherited.used = 0; 628 629 return 0; 630 } 631 632 void network_socket_activation_to_env (server * const srv) { 633 /* set up listening sockets for systemd socket activation 634 * and ensure FD_CLOEXEC flag is not set on listen fds */ 635 int fd = 3; /* #define SD_LISTEN_FDS_START 3 */ 636 for (uint32_t n = 0, i; n < srv->srv_sockets.used; ++n) { 637 server_socket *srv_socket = srv->srv_sockets.ptr[n]; 638 if (srv_socket->fd < fd) continue; 639 if (srv_socket->fd == fd) { 640 fdevent_clrfd_cloexec(fd); 641 ++fd; 642 continue; 643 } 644 /* (expecting ordered list, but check if fd is later in list)*/ 645 for (i = n+1; i < srv->srv_sockets.used; ++i) { 646 if (fd == srv->srv_sockets.ptr[i]->fd) 647 break; 648 } 649 if (i < srv->srv_sockets.used) { 650 fdevent_clrfd_cloexec(fd); 651 ++fd; 652 --n; /* loop to reprocess this entry */ 653 continue; 654 } 655 656 /* dup2() removes FD_CLOEXEC on newfd */ 657 if (fd != dup2(srv_socket->fd, fd)) continue; 658 ++fd; 659 /* old fd will be closed upon execv() due to its FD_CLOEXEC flag 660 * (if not already closed by another dup2() over it) */ 661 } 662 fd -= 3; /* now num fds; #define SD_LISTEN_FDS_START 3 */ 663 if (0 == fd) return; /*(no active sockets?)*/ 664 buffer * const tb = srv->tmp_buf; 665 buffer_clear(tb); 666 buffer_append_int(tb, fd); 667 setenv("LISTEN_FDS", tb->ptr, 1); 668 buffer_clear(tb); 669 buffer_append_int(tb, srv->pid); /* getpid() */ 670 setenv("LISTEN_PID", tb->ptr, 1); 671 } 672 673 static int network_socket_activation_nfds(server *srv, const network_socket_config *s, int nfds) { 674 buffer *host = buffer_init(); 675 socklen_t addr_len; 676 sock_addr addr; 677 int rc = 0; 678 nfds += 3; /* #define SD_LISTEN_FDS_START 3 */ 679 for (int fd = 3; fd < nfds; ++fd) { 680 addr_len = sizeof(sock_addr); 681 if (-1 == (rc = getsockname(fd, (struct sockaddr *)&addr, &addr_len))) { 682 log_perror(srv->errh, __FILE__, __LINE__, 683 "socket activation getsockname()"); 684 break; 685 } 686 network_host_normalize_addr_str(host, &addr, addr_len); 687 rc = network_server_init(srv, s, host, 0, fd); 688 if (0 != rc) break; 689 srv->srv_sockets.ptr[srv->srv_sockets.used-1]->sidx = (unsigned short)~0u; 690 } 691 buffer_free(host); 692 memcpy(&srv->srv_sockets_inherited, &srv->srv_sockets, sizeof(server_socket_array)); 693 memset(&srv->srv_sockets, 0, sizeof(server_socket_array)); 694 return rc; 695 } 696 697 static int network_socket_activation_from_env(server *srv, const network_socket_config *s) { 698 char *listen_pid = getenv("LISTEN_PID"); 699 char *listen_fds = getenv("LISTEN_FDS"); 700 pid_t lpid = listen_pid ? (pid_t)strtoul(listen_pid,NULL,10) : 0; 701 int nfds = listen_fds ? atoi(listen_fds) : 0; 702 int rc = (nfds > 0 && nfds < 5000 703 && (lpid == getpid() 704 #ifndef _WIN32 705 || (0 == strncmp(listen_pid, "parent:", 7) 706 && getppid() == (pid_t)strtoul(listen_pid+7,NULL,10)) 707 #endif 708 )) 709 ? network_socket_activation_nfds(srv, s, nfds) 710 : 0; 711 unsetenv("LISTEN_PID"); 712 unsetenv("LISTEN_FDS"); 713 unsetenv("LISTEN_FDNAMES"); 714 /*(upon graceful restart, unsetenv will result in no-op above)*/ 715 return rc; 716 } 717 718 int network_init(server *srv, int stdin_fd) { 719 /*(network params used during setup (from $SERVER["socket"] condition))*/ 720 static const config_plugin_keys_t cpk[] = { 721 { CONST_STR_LEN("ssl.engine"), 722 T_CONFIG_BOOL, 723 T_CONFIG_SCOPE_SOCKET } 724 ,{ CONST_STR_LEN("server.listen-backlog"), 725 T_CONFIG_INT, 726 T_CONFIG_SCOPE_SOCKET } 727 ,{ CONST_STR_LEN("server.socket-perms"), 728 T_CONFIG_STRING, 729 T_CONFIG_SCOPE_SOCKET } 730 ,{ CONST_STR_LEN("server.bsd-accept-filter"), 731 T_CONFIG_STRING, 732 T_CONFIG_SCOPE_SOCKET } 733 ,{ CONST_STR_LEN("server.defer-accept"), 734 T_CONFIG_BOOL, 735 T_CONFIG_SCOPE_SOCKET } 736 ,{ CONST_STR_LEN("server.use-ipv6"), 737 T_CONFIG_BOOL, 738 T_CONFIG_SCOPE_SOCKET } 739 ,{ CONST_STR_LEN("server.set-v6only"), 740 T_CONFIG_BOOL, 741 T_CONFIG_SCOPE_SOCKET } 742 ,{ CONST_STR_LEN("server.v4mapped"), 743 T_CONFIG_BOOL, 744 T_CONFIG_SCOPE_SOCKET } 745 ,{ NULL, 0, 746 T_CONFIG_UNSET, 747 T_CONFIG_SCOPE_UNSET } 748 }; 749 750 #ifdef __WIN32 751 WSADATA wsaData; 752 WORD wVersionRequested = MAKEWORD(2, 2); 753 if (0 != WSAStartup(wVersionRequested, &wsaData)) { 754 /* Tell the user that we could not find a usable WinSock DLL */ 755 return -1; 756 } 757 #endif 758 759 if (0 != network_write_init(srv)) return -1; 760 761 network_plugin_data np; 762 memset(&np, 0, sizeof(network_plugin_data)); 763 network_plugin_data *p = &np; 764 765 if (!config_plugin_values_init(srv, p, cpk, "network")) 766 return HANDLER_ERROR; 767 768 p->defaults.listen_backlog = 1024; 769 p->defaults.defer_accept = 0; 770 p->defaults.use_ipv6 = 0; 771 p->defaults.set_v6only = 1; 772 p->defaults.v4mapped = -1; /*(-1 for unset; not 0 or 1)*/ 773 774 /* initialize p->defaults from global config context */ 775 if (p->nconfig > 0 && p->cvlist->v.u2[1]) { 776 const config_plugin_value_t *cpv = p->cvlist + p->cvlist->v.u2[0]; 777 if (-1 != cpv->k_id) 778 network_merge_config(&p->defaults, cpv); 779 } 780 781 if (config_feature_bool(srv, "server.graceful-restart-bg", 0)) 782 srv->srvconf.systemd_socket_activation = 1; 783 784 int rc = 0; 785 do { 786 787 if (srv->srvconf.systemd_socket_activation) { 788 for (uint32_t i = 0; i < srv->srv_sockets_inherited.used; ++i) { 789 srv->srv_sockets_inherited.ptr[i]->sidx = (unsigned short)~0u; 790 } 791 rc = network_socket_activation_from_env(srv, &p->defaults); 792 if (0 != rc) break; 793 if (0 == srv->srv_sockets_inherited.used) { 794 srv->srvconf.systemd_socket_activation = 0; 795 } 796 } 797 798 /* special-case srv->srvconf.bindhost = "/dev/stdin" (see server.c) */ 799 if (-1 != stdin_fd) { 800 buffer *b = buffer_init(); 801 buffer_copy_buffer(b, srv->srvconf.bindhost); 802 /*assert(buffer_eq_slen(b, CONST_STR_LEN("/dev/stdin")));*/ 803 rc = (0 == srv->srv_sockets.used) 804 ? network_server_init(srv, &p->defaults, b, 0, stdin_fd) 805 : close(stdin_fd);/*(graceful restart listening to "/dev/stdin")*/ 806 buffer_free(b); 807 if (0 != rc) break; 808 } 809 810 /* check for $SERVER["socket"] */ 811 for (uint32_t i = 1; i < srv->config_context->used; ++i) { 812 config_cond_info cfginfo; 813 config_get_config_cond_info(&cfginfo, i); 814 if (COMP_SERVER_SOCKET != cfginfo.comp) continue;/* not our stage */ 815 816 buffer *host_token; 817 *(const buffer **)&host_token = cfginfo.string; 818 /*(cfginfo.string is modified during config)*/ 819 820 memcpy(&p->conf, &p->defaults, sizeof(network_socket_config)); 821 for (int j = !p->cvlist[0].v.u2[1]; j < p->nconfig; ++j) { 822 if ((int)i != p->cvlist[j].k_id) continue; 823 const config_plugin_value_t *cpv = 824 p->cvlist + p->cvlist[j].v.u2[0]; 825 network_merge_config(&p->conf, cpv); 826 break; 827 } 828 829 if (cfginfo.cond == CONFIG_COND_EQ) { 830 rc = network_server_init(srv, &p->conf, host_token, i, -1); 831 if (0 != rc) break; 832 } 833 else if (cfginfo.cond == CONFIG_COND_NE) { 834 socklen_t addr_len = sizeof(sock_addr); 835 sock_addr addr; 836 rc = network_host_parse_addr(srv, &addr, &addr_len, 837 host_token, p->conf.use_ipv6); 838 if (0 != rc) break; 839 network_host_normalize_addr_str(host_token, &addr, addr_len); 840 } 841 } 842 if (0 != rc) break; 843 844 /* process srv->srvconf.bindhost 845 * init global config for server.bindhost and server.port after 846 * initializing $SERVER["socket"] so that if bindhost and port match 847 * another $SERVER["socket"], the $SERVER["socket"] config is used, 848 * as the $SERVER["socket"] config inherits from the global scope and 849 * can then be overridden. (bindhost = "/dev/stdin" is handled above) 850 * (skip if systemd socket activation is enabled and bindhost is empty; 851 * do not additionally listen on "*") */ 852 if ((!srv->srvconf.systemd_socket_activation || srv->srvconf.bindhost) 853 && -1 == stdin_fd) { 854 buffer *b = buffer_init(); 855 if (srv->srvconf.bindhost) 856 buffer_copy_buffer(b, srv->srvconf.bindhost); 857 /*(skip adding port if unix socket path)*/ 858 if (!b->ptr || (b->ptr[0] != '/' && b->ptr[0] != '\\')) { 859 buffer_append_char(b, ':'); 860 buffer_append_int(b, srv->srvconf.port); 861 } 862 #ifdef __COVERITY__ 863 force_assert(b->ptr); 864 #endif 865 866 rc = network_server_init(srv, &p->defaults, b, 0, -1); 867 buffer_free(b); 868 if (0 != rc) break; 869 } 870 871 if (srv->srvconf.systemd_socket_activation) { 872 /* activate any inherited sockets not explicitly listed in config */ 873 server_socket *srv_socket; 874 for (uint32_t i = 0; i < srv->srv_sockets_inherited.used; ++i) { 875 if ((unsigned short)~0u 876 != srv->srv_sockets_inherited.ptr[i]->sidx) 877 continue; 878 srv->srv_sockets_inherited.ptr[i]->sidx = 0; 879 srv_socket = ck_calloc(1, sizeof(server_socket)); 880 memcpy(srv_socket, srv->srv_sockets_inherited.ptr[i], 881 sizeof(server_socket)); 882 srv_socket->is_ssl = p->defaults.ssl_enabled; 883 /*(note: re-inits srv_socket->srv_token to new buffer ptr)*/ 884 network_srv_socket_init_token(srv_socket,srv_socket->srv_token); 885 network_srv_sockets_append(srv, srv_socket); 886 } 887 } 888 889 /* reset sidx of any graceful sockets not explicitly listed in config */ 890 for (uint32_t i = 0; i < srv->srv_sockets.used; ++i) { 891 if ((unsigned short)~0u == srv->srv_sockets.ptr[i]->sidx) { 892 srv->srv_sockets.ptr[i]->sidx = 0; 893 srv->srv_sockets.ptr[i]->is_ssl = p->defaults.ssl_enabled; 894 } 895 } 896 897 } while (0); 898 899 free(p->cvlist); 900 return rc; 901 } 902 903 void network_unregister_sock(server *srv, server_socket *srv_socket) { 904 fdnode *fdn = srv_socket->fdn; 905 if (NULL == fdn) return; 906 fdevent_fdnode_event_del(srv->ev, fdn); 907 fdevent_unregister(srv->ev, fdn->fd); 908 srv_socket->fdn = NULL; 909 } 910 911 int network_register_fdevents(server *srv) { 912 if (-1 == fdevent_reset(srv->ev)) { 913 return -1; 914 } 915 916 if (srv->sockets_disabled) return 0; /* lighttpd -1 (one-shot mode) */ 917 918 /* register fdevents after reset */ 919 for (uint32_t i = 0; i < srv->srv_sockets.used; ++i) { 920 server_socket *srv_socket = srv->srv_sockets.ptr[i]; 921 922 srv_socket->fdn = fdevent_register(srv->ev, srv_socket->fd, network_server_handle_fdevent, srv_socket); 923 fdevent_fdnode_event_set(srv->ev, srv_socket->fdn, FDEVENT_IN); 924 } 925 return 0; 926 } 927