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 if (srv->srv_sockets.used == srv->srv_sockets.size) { 270 srv->srv_sockets.size += 4; 271 srv->srv_sockets.ptr = realloc(srv->srv_sockets.ptr, srv->srv_sockets.size * sizeof(server_socket*)); 272 force_assert(NULL != srv->srv_sockets.ptr); 273 } 274 275 srv->srv_sockets.ptr[srv->srv_sockets.used++] = srv_socket; 276 } 277 278 typedef struct { 279 /* global or per-socket config; not patched per connection */ 280 int listen_backlog; 281 unsigned char ssl_enabled; 282 unsigned char use_ipv6; 283 unsigned char set_v6only; /* set_v6only is only a temporary option */ 284 unsigned char defer_accept; 285 int8_t v4mapped; 286 const buffer *socket_perms; 287 const buffer *bsd_accept_filter; 288 } network_socket_config; 289 290 typedef struct { 291 PLUGIN_DATA; 292 network_socket_config defaults; 293 network_socket_config conf; 294 } network_plugin_data; 295 296 static void network_merge_config_cpv(network_socket_config * const pconf, const config_plugin_value_t * const cpv) { 297 switch (cpv->k_id) { /* index into static config_plugin_keys_t cpk[] */ 298 case 0: /* ssl.engine */ 299 pconf->ssl_enabled = (0 != cpv->v.u); 300 break; 301 case 1: /* server.listen-backlog */ 302 pconf->listen_backlog = (int)cpv->v.u; 303 break; 304 case 2: /* server.socket-perms */ 305 pconf->socket_perms = cpv->v.b; 306 break; 307 case 3: /* server.bsd-accept-filter */ 308 pconf->bsd_accept_filter = cpv->v.b; 309 break; 310 case 4: /* server.defer-accept */ 311 pconf->defer_accept = (0 != cpv->v.u); 312 break; 313 case 5: /* server.use-ipv6 */ 314 pconf->use_ipv6 = (0 != cpv->v.u); 315 break; 316 case 6: /* server.set-v6only */ 317 pconf->set_v6only = (0 != cpv->v.u); 318 break; 319 case 7: /* server.v4mapped */ 320 pconf->v4mapped = (0 != cpv->v.u); 321 break; 322 default:/* should not happen */ 323 return; 324 } 325 } 326 327 static void network_merge_config(network_socket_config * const pconf, const config_plugin_value_t *cpv) { 328 do { 329 network_merge_config_cpv(pconf, cpv); 330 } while ((++cpv)->k_id != -1); 331 } 332 333 __attribute_pure__ 334 static uint8_t network_srv_token_colon (const buffer * const b) { 335 const char *colon = NULL; 336 const char * const p = b->ptr; 337 if (*p == '[') { 338 colon = strstr(p, "]:"); 339 if (colon) ++colon; 340 } 341 else if (*p != '/') { 342 colon = strchr(p, ':'); 343 } 344 return colon ? (uint8_t)(colon - p) : (uint8_t)buffer_clen(b); 345 } 346 347 static void network_srv_socket_init_token (server_socket * const srv_socket, const buffer * const token) { 348 buffer * const srv_token = srv_socket->srv_token = buffer_init(); 349 buffer_copy_buffer(srv_token, token); 350 #ifdef HAVE_SYS_UN_H 351 /*(srv_socket->addr must have been initialized by caller)*/ 352 if (AF_UNIX == sock_addr_get_family(&srv_socket->addr)) 353 srv_socket->srv_token_colon = buffer_clen(srv_token); 354 else 355 #endif 356 srv_socket->srv_token_colon = network_srv_token_colon(srv_token); 357 } 358 359 static int network_server_init(server *srv, network_socket_config *s, buffer *host_token, size_t sidx, int stdin_fd) { 360 server_socket *srv_socket; 361 const char *host; 362 socklen_t addr_len = sizeof(sock_addr); 363 sock_addr addr; 364 int family = 0; 365 int set_v6only = 0; 366 367 if (buffer_is_blank(host_token)) { 368 log_error(srv->errh, __FILE__, __LINE__, 369 "value of $SERVER[\"socket\"] must not be empty"); 370 return -1; 371 } 372 373 /* check if we already know this socket, and if yes, don't init it 374 * (optimization: check strings here to filter out exact matches; 375 * binary addresses are matched further below) */ 376 for (uint32_t i = 0; i < srv->srv_sockets.used; ++i) { 377 if (buffer_is_equal(srv->srv_sockets.ptr[i]->srv_token, host_token)) { 378 return 0; 379 } 380 } 381 382 host = host_token->ptr; 383 if ((s->use_ipv6 && (*host == '\0' || *host == ':')) || (host[0] == '[' && host[1] == ']')) { 384 log_error(srv->errh, __FILE__, __LINE__, 385 "warning: please use server.use-ipv6 only for hostnames, " 386 "not without server.bind / empty address; your config will " 387 "break if the kernel default for IPV6_V6ONLY changes"); 388 } 389 if (*host == '[') s->use_ipv6 = 1; 390 391 memset(&addr, 0, sizeof(addr)); 392 if (-1 != stdin_fd) { 393 if (-1 == getsockname(stdin_fd, (struct sockaddr *)&addr, &addr_len)) { 394 log_perror(srv->errh, __FILE__, __LINE__, "getsockname()"); 395 return -1; 396 } 397 } else if (0 != network_host_parse_addr(srv, &addr, &addr_len, host_token, s->use_ipv6)) { 398 return -1; 399 } 400 401 family = sock_addr_get_family(&addr); 402 403 #ifdef HAVE_IPV6 404 if (*host != '\0' && AF_INET6 == family) { 405 if (s->set_v6only) { 406 set_v6only = 1; 407 } else { 408 log_error(srv->errh, __FILE__, __LINE__, 409 "warning: server.set-v6only will be removed soon, " 410 "update your config to have different sockets for ipv4 and ipv6"); 411 } 412 } 413 if (AF_INET6 == family && -1 != s->v4mapped) { /*(configured; -1 is unset)*/ 414 set_v6only = (s->v4mapped ? -1 : 1); 415 } 416 #endif 417 418 network_host_normalize_addr_str(host_token, &addr, addr_len); 419 host = host_token->ptr; 420 421 if (srv->srvconf.preflight_check) { 422 return 0; 423 } 424 425 /* check if we already know this socket (after potential DNS resolution), and if yes, don't init it */ 426 for (uint32_t i = 0; i < srv->srv_sockets.used; ++i) { 427 if (0 == memcmp(&srv->srv_sockets.ptr[i]->addr, &addr, sizeof(addr))) { 428 return 0; 429 } 430 } 431 432 srv_socket = calloc(1, sizeof(*srv_socket)); 433 force_assert(NULL != srv_socket); 434 memcpy(&srv_socket->addr, &addr, addr_len); 435 srv_socket->fd = -1; 436 srv_socket->sidx = sidx; 437 srv_socket->is_ssl = s->ssl_enabled; 438 srv_socket->srv = srv; 439 network_srv_socket_init_token(srv_socket, host_token); 440 network_srv_sockets_append(srv, srv_socket); 441 442 if (srv->sockets_disabled) { /* lighttpd -1 (one-shot mode) */ 443 return 0; 444 } 445 446 if (srv->srvconf.systemd_socket_activation) { 447 for (uint32_t i = 0; i < srv->srv_sockets_inherited.used; ++i) { 448 if (0 != memcmp(&srv->srv_sockets_inherited.ptr[i]->addr, &srv_socket->addr, addr_len)) continue; 449 if ((unsigned short)~0u == srv->srv_sockets_inherited.ptr[i]->sidx) { 450 srv->srv_sockets_inherited.ptr[i]->sidx = sidx; 451 } 452 stdin_fd = srv->srv_sockets_inherited.ptr[i]->fd; 453 break; 454 } 455 } 456 457 if (-1 != stdin_fd) { 458 srv_socket->fd = stdin_fd; 459 if (-1 == fdevent_fcntl_set_nb_cloexec(stdin_fd)) { 460 log_perror(srv->errh, __FILE__, __LINE__, "fcntl"); 461 return -1; 462 } 463 } else 464 #ifdef HAVE_SYS_UN_H 465 if (AF_UNIX == family) { 466 /* check if the socket exists and try to connect to it. */ 467 force_assert(host); /*(static analysis hint)*/ 468 if (-1 == (srv_socket->fd = fdevent_socket_cloexec(AF_UNIX, SOCK_STREAM, 0))) { 469 log_perror(srv->errh, __FILE__, __LINE__, "socket"); 470 return -1; 471 } 472 if (0 == connect(srv_socket->fd, (struct sockaddr *) &(srv_socket->addr), addr_len)) { 473 log_error(srv->errh, __FILE__, __LINE__, 474 "server socket is still in use: %s", host); 475 return -1; 476 } 477 478 /* connect failed */ 479 switch(errno) { 480 case ECONNREFUSED: 481 if (*host == '/') unlink(host); 482 break; 483 case ENOENT: 484 break; 485 default: 486 log_perror(srv->errh, __FILE__, __LINE__, 487 "testing socket failed: %s", host); 488 return -1; 489 } 490 491 if (-1 == fdevent_fcntl_set_nb(srv_socket->fd)) { 492 log_perror(srv->errh, __FILE__, __LINE__, "fcntl"); 493 return -1; 494 } 495 } else 496 #endif 497 { 498 if (-1 == (srv_socket->fd = fdevent_socket_nb_cloexec(family, SOCK_STREAM, IPPROTO_TCP))) { 499 log_perror(srv->errh, __FILE__, __LINE__, "socket"); 500 return -1; 501 } 502 503 #ifdef HAVE_IPV6 504 if (set_v6only) { 505 int val = (set_v6only > 0); 506 if (-1 == setsockopt(srv_socket->fd, IPPROTO_IPV6, IPV6_V6ONLY, &val, sizeof(val))) { 507 log_perror(srv->errh, __FILE__, __LINE__, "setsockopt(IPV6_V6ONLY)"); 508 return -1; 509 } 510 } 511 #endif 512 } 513 514 /* */ 515 srv->cur_fds = srv_socket->fd; 516 517 if (fdevent_set_so_reuseaddr(srv_socket->fd, 1) < 0) { 518 log_perror(srv->errh, __FILE__, __LINE__, "setsockopt(SO_REUSEADDR)"); 519 return -1; 520 } 521 522 if (family != AF_UNIX) { 523 if (fdevent_set_tcp_nodelay(srv_socket->fd, 1) < 0) { 524 log_perror(srv->errh, __FILE__, __LINE__, "setsockopt(TCP_NODELAY)"); 525 return -1; 526 } 527 } 528 529 if (-1 != stdin_fd) { } else 530 if (0 != bind(srv_socket->fd, (struct sockaddr *) &(srv_socket->addr), addr_len)) { 531 log_perror(srv->errh, __FILE__, __LINE__, 532 "can't bind to socket: %s", host); 533 return -1; 534 } 535 536 #ifdef HAVE_SYS_UN_H 537 if (-1 != stdin_fd) { } else 538 if (AF_UNIX == family && s->socket_perms) { 539 mode_t m = 0; 540 for (char *str = s->socket_perms->ptr; *str; ++str) { 541 m <<= 3; 542 m |= (*str - '0'); 543 } 544 if (0 != m && *host == '/' && -1 == chmod(host, m)) { 545 log_perror(srv->errh, __FILE__, __LINE__, 546 "chmod(\"%s\", %s)", host, s->socket_perms->ptr); 547 return -1; 548 } 549 } 550 #endif 551 552 if (-1 != stdin_fd) { } else 553 if (-1 == listen(srv_socket->fd, s->listen_backlog)) { 554 log_perror(srv->errh, __FILE__, __LINE__, "listen"); 555 return -1; 556 } 557 558 if (s->ssl_enabled) { 559 } 560 #ifdef TCP_DEFER_ACCEPT 561 else if (s->defer_accept) { 562 int v = s->defer_accept; 563 if (-1 == setsockopt(srv_socket->fd, IPPROTO_TCP, TCP_DEFER_ACCEPT, &v, sizeof(v))) { 564 log_perror(srv->errh, __FILE__, __LINE__, "can't set TCP_DEFER_ACCEPT"); 565 } 566 } 567 #endif 568 #if defined(__FreeBSD__) || defined(__NetBSD__) \ 569 || defined(__OpenBSD__) || defined(__DragonFly__) 570 #ifdef SO_ACCEPTFILTER 571 else if (s->bsd_accept_filter 572 && (buffer_is_equal_string(s->bsd_accept_filter, CONST_STR_LEN("httpready")) 573 || buffer_is_equal_string(s->bsd_accept_filter, CONST_STR_LEN("dataready")))) { 574 /* FreeBSD accf_http filter */ 575 struct accept_filter_arg afa; 576 memset(&afa, 0, sizeof(afa)); 577 strncpy(afa.af_name, s->bsd_accept_filter->ptr, sizeof(afa.af_name)-1); 578 if (setsockopt(srv_socket->fd, SOL_SOCKET, SO_ACCEPTFILTER, &afa, sizeof(afa)) < 0) { 579 if (errno != ENOENT) { 580 log_perror(srv->errh, __FILE__, __LINE__, 581 "can't set accept-filter '%s'", s->bsd_accept_filter->ptr); 582 } 583 } 584 } 585 #endif 586 #endif 587 588 return 0; 589 } 590 591 int network_close(server *srv) { 592 for (uint32_t i = 0; i < srv->srv_sockets.used; ++i) { 593 server_socket *srv_socket = srv->srv_sockets.ptr[i]; 594 if (srv_socket->fd != -1) { 595 network_unregister_sock(srv, srv_socket); 596 close(srv_socket->fd); 597 } 598 599 buffer_free(srv_socket->srv_token); 600 601 free(srv_socket); 602 } 603 604 free(srv->srv_sockets.ptr); 605 srv->srv_sockets.ptr = NULL; 606 srv->srv_sockets.used = 0; 607 srv->srv_sockets.size = 0; 608 609 for (uint32_t i = 0; i < srv->srv_sockets_inherited.used; ++i) { 610 server_socket *srv_socket = srv->srv_sockets_inherited.ptr[i]; 611 if (srv_socket->fd != -1 && srv_socket->sidx != (unsigned short)~0u) { 612 close(srv_socket->fd); 613 } 614 615 buffer_free(srv_socket->srv_token); 616 617 free(srv_socket); 618 } 619 620 free(srv->srv_sockets_inherited.ptr); 621 srv->srv_sockets_inherited.ptr = NULL; 622 srv->srv_sockets_inherited.used = 0; 623 srv->srv_sockets_inherited.size = 0; 624 625 return 0; 626 } 627 628 void network_socket_activation_to_env (server * const srv) { 629 /* set up listening sockets for systemd socket activation 630 * and ensure FD_CLOEXEC flag is not set on listen fds */ 631 int fd = 3; /* #define SD_LISTEN_FDS_START 3 */ 632 for (uint32_t n = 0, i; n < srv->srv_sockets.used; ++n) { 633 server_socket *srv_socket = srv->srv_sockets.ptr[n]; 634 if (srv_socket->fd < fd) continue; 635 if (srv_socket->fd == fd) { 636 fdevent_clrfd_cloexec(fd); 637 ++fd; 638 continue; 639 } 640 /* (expecting ordered list, but check if fd is later in list)*/ 641 for (i = n+1; i < srv->srv_sockets.used; ++i) { 642 if (fd == srv->srv_sockets.ptr[i]->fd) 643 break; 644 } 645 if (i < srv->srv_sockets.used) { 646 fdevent_clrfd_cloexec(fd); 647 ++fd; 648 --n; /* loop to reprocess this entry */ 649 continue; 650 } 651 652 /* dup2() removes FD_CLOEXEC on newfd */ 653 if (fd != dup2(srv_socket->fd, fd)) continue; 654 ++fd; 655 /* old fd will be closed upon execv() due to its FD_CLOEXEC flag 656 * (if not already closed by another dup2() over it) */ 657 } 658 fd -= 3; /* now num fds; #define SD_LISTEN_FDS_START 3 */ 659 if (0 == fd) return; /*(no active sockets?)*/ 660 buffer * const tb = srv->tmp_buf; 661 buffer_clear(tb); 662 buffer_append_int(tb, fd); 663 setenv("LISTEN_FDS", tb->ptr, 1); 664 buffer_clear(tb); 665 buffer_append_int(tb, srv->pid); /* getpid() */ 666 setenv("LISTEN_PID", tb->ptr, 1); 667 } 668 669 static int network_socket_activation_nfds(server *srv, network_socket_config *s, int nfds) { 670 buffer *host = buffer_init(); 671 socklen_t addr_len; 672 sock_addr addr; 673 int rc = 0; 674 nfds += 3; /* #define SD_LISTEN_FDS_START 3 */ 675 for (int fd = 3; fd < nfds; ++fd) { 676 addr_len = sizeof(sock_addr); 677 if (-1 == (rc = getsockname(fd, (struct sockaddr *)&addr, &addr_len))) { 678 log_perror(srv->errh, __FILE__, __LINE__, 679 "socket activation getsockname()"); 680 break; 681 } 682 network_host_normalize_addr_str(host, &addr, addr_len); 683 rc = network_server_init(srv, s, host, 0, fd); 684 if (0 != rc) break; 685 srv->srv_sockets.ptr[srv->srv_sockets.used-1]->sidx = (unsigned short)~0u; 686 } 687 buffer_free(host); 688 memcpy(&srv->srv_sockets_inherited, &srv->srv_sockets, sizeof(server_socket_array)); 689 memset(&srv->srv_sockets, 0, sizeof(server_socket_array)); 690 return rc; 691 } 692 693 static int network_socket_activation_from_env(server *srv, network_socket_config *s) { 694 char *listen_pid = getenv("LISTEN_PID"); 695 char *listen_fds = getenv("LISTEN_FDS"); 696 pid_t lpid = listen_pid ? (pid_t)strtoul(listen_pid,NULL,10) : 0; 697 int nfds = listen_fds ? atoi(listen_fds) : 0; 698 int rc = (nfds > 0 && nfds < 5000 699 && (lpid == getpid() 700 #ifndef _WIN32 701 || (0 == strncmp(listen_pid, "parent:", 7) 702 && getppid() == (pid_t)strtoul(listen_pid+7,NULL,10)) 703 #endif 704 )) 705 ? network_socket_activation_nfds(srv, s, nfds) 706 : 0; 707 unsetenv("LISTEN_PID"); 708 unsetenv("LISTEN_FDS"); 709 unsetenv("LISTEN_FDNAMES"); 710 /*(upon graceful restart, unsetenv will result in no-op above)*/ 711 return rc; 712 } 713 714 int network_init(server *srv, int stdin_fd) { 715 /*(network params used during setup (from $SERVER["socket"] condition))*/ 716 static const config_plugin_keys_t cpk[] = { 717 { CONST_STR_LEN("ssl.engine"), 718 T_CONFIG_BOOL, 719 T_CONFIG_SCOPE_SOCKET } 720 ,{ CONST_STR_LEN("server.listen-backlog"), 721 T_CONFIG_INT, 722 T_CONFIG_SCOPE_SOCKET } 723 ,{ CONST_STR_LEN("server.socket-perms"), 724 T_CONFIG_STRING, 725 T_CONFIG_SCOPE_SOCKET } 726 ,{ CONST_STR_LEN("server.bsd-accept-filter"), 727 T_CONFIG_STRING, 728 T_CONFIG_SCOPE_SOCKET } 729 ,{ CONST_STR_LEN("server.defer-accept"), 730 T_CONFIG_BOOL, 731 T_CONFIG_SCOPE_SOCKET } 732 ,{ CONST_STR_LEN("server.use-ipv6"), 733 T_CONFIG_BOOL, 734 T_CONFIG_SCOPE_SOCKET } 735 ,{ CONST_STR_LEN("server.set-v6only"), 736 T_CONFIG_BOOL, 737 T_CONFIG_SCOPE_SOCKET } 738 ,{ CONST_STR_LEN("server.v4mapped"), 739 T_CONFIG_BOOL, 740 T_CONFIG_SCOPE_SOCKET } 741 ,{ NULL, 0, 742 T_CONFIG_UNSET, 743 T_CONFIG_SCOPE_UNSET } 744 }; 745 746 #ifdef __WIN32 747 WSADATA wsaData; 748 WORD wVersionRequested = MAKEWORD(2, 2); 749 if (0 != WSAStartup(wVersionRequested, &wsaData)) { 750 /* Tell the user that we could not find a usable WinSock DLL */ 751 return -1; 752 } 753 #endif 754 755 if (0 != network_write_init(srv)) return -1; 756 757 network_plugin_data np; 758 memset(&np, 0, sizeof(network_plugin_data)); 759 network_plugin_data *p = &np; 760 761 if (!config_plugin_values_init(srv, p, cpk, "network")) 762 return HANDLER_ERROR; 763 764 p->defaults.listen_backlog = 1024; 765 p->defaults.defer_accept = 0; 766 p->defaults.use_ipv6 = 0; 767 p->defaults.set_v6only = 1; 768 p->defaults.v4mapped = -1; /*(-1 for unset; not 0 or 1)*/ 769 770 /* initialize p->defaults from global config context */ 771 if (p->nconfig > 0 && p->cvlist->v.u2[1]) { 772 const config_plugin_value_t *cpv = p->cvlist + p->cvlist->v.u2[0]; 773 if (-1 != cpv->k_id) 774 network_merge_config(&p->defaults, cpv); 775 } 776 777 int rc = 0; 778 do { 779 780 if (srv->srvconf.systemd_socket_activation) { 781 for (uint32_t i = 0; i < srv->srv_sockets_inherited.used; ++i) { 782 srv->srv_sockets_inherited.ptr[i]->sidx = (unsigned short)~0u; 783 } 784 rc = network_socket_activation_from_env(srv, &p->defaults); 785 if (0 != rc) break; 786 if (0 == srv->srv_sockets_inherited.used) { 787 srv->srvconf.systemd_socket_activation = 0; 788 } 789 } 790 791 /* special-case srv->srvconf.bindhost = "/dev/stdin" (see server.c) */ 792 if (-1 != stdin_fd) { 793 buffer *b = buffer_init(); 794 buffer_copy_buffer(b, srv->srvconf.bindhost); 795 /*assert(buffer_eq_slen(b, CONST_STR_LEN("/dev/stdin")));*/ 796 rc = (0 == srv->srv_sockets.used) 797 ? network_server_init(srv, &p->defaults, b, 0, stdin_fd) 798 : close(stdin_fd);/*(graceful restart listening to "/dev/stdin")*/ 799 buffer_free(b); 800 if (0 != rc) break; 801 } 802 803 /* check for $SERVER["socket"] */ 804 for (uint32_t i = 1; i < srv->config_context->used; ++i) { 805 config_cond_info cfginfo; 806 config_get_config_cond_info(&cfginfo, i); 807 if (COMP_SERVER_SOCKET != cfginfo.comp) continue;/* not our stage */ 808 809 buffer *host_token; 810 *(const buffer **)&host_token = cfginfo.string; 811 /*(cfginfo.string is modified during config)*/ 812 813 memcpy(&p->conf, &p->defaults, sizeof(network_socket_config)); 814 for (int j = !p->cvlist[0].v.u2[1]; j < p->nconfig; ++j) { 815 if ((int)i != p->cvlist[j].k_id) continue; 816 const config_plugin_value_t *cpv = 817 p->cvlist + p->cvlist[j].v.u2[0]; 818 network_merge_config(&p->conf, cpv); 819 break; 820 } 821 822 if (cfginfo.cond == CONFIG_COND_EQ) { 823 rc = network_server_init(srv, &p->conf, host_token, i, -1); 824 if (0 != rc) break; 825 } 826 else if (cfginfo.cond == CONFIG_COND_NE) { 827 socklen_t addr_len = sizeof(sock_addr); 828 sock_addr addr; 829 rc = network_host_parse_addr(srv, &addr, &addr_len, 830 host_token, p->conf.use_ipv6); 831 if (0 != rc) break; 832 network_host_normalize_addr_str(host_token, &addr, addr_len); 833 } 834 } 835 if (0 != rc) break; 836 837 /* process srv->srvconf.bindhost 838 * init global config for server.bindhost and server.port after 839 * initializing $SERVER["socket"] so that if bindhost and port match 840 * another $SERVER["socket"], the $SERVER["socket"] config is used, 841 * as the $SERVER["socket"] config inherits from the global scope and 842 * can then be overridden. (bindhost = "/dev/stdin" is handled above) 843 * (skip if systemd socket activation is enabled and bindhost is empty; 844 * do not additionally listen on "*") */ 845 if ((!srv->srvconf.systemd_socket_activation || srv->srvconf.bindhost) 846 && -1 == stdin_fd) { 847 buffer *b = buffer_init(); 848 if (srv->srvconf.bindhost) 849 buffer_copy_buffer(b, srv->srvconf.bindhost); 850 /*(skip adding port if unix socket path)*/ 851 if (!b->ptr || (b->ptr[0] != '/' && b->ptr[0] != '\\')) { 852 buffer_append_char(b, ':'); 853 buffer_append_int(b, srv->srvconf.port); 854 } 855 #ifdef __COVERITY__ 856 force_assert(b->ptr); 857 #endif 858 859 rc = network_server_init(srv, &p->defaults, b, 0, -1); 860 buffer_free(b); 861 if (0 != rc) break; 862 } 863 864 if (srv->srvconf.systemd_socket_activation) { 865 /* activate any inherited sockets not explicitly listed in config */ 866 server_socket *srv_socket; 867 for (uint32_t i = 0; i < srv->srv_sockets_inherited.used; ++i) { 868 if ((unsigned short)~0u 869 != srv->srv_sockets_inherited.ptr[i]->sidx) 870 continue; 871 srv->srv_sockets_inherited.ptr[i]->sidx = 0; 872 srv_socket = calloc(1, sizeof(server_socket)); 873 force_assert(NULL != srv_socket); 874 memcpy(srv_socket, srv->srv_sockets_inherited.ptr[i], 875 sizeof(server_socket)); 876 /*(note: re-inits srv_socket->srv_token to new buffer ptr)*/ 877 network_srv_socket_init_token(srv_socket,srv_socket->srv_token); 878 network_srv_sockets_append(srv, srv_socket); 879 } 880 } 881 882 } while (0); 883 884 free(p->cvlist); 885 return rc; 886 } 887 888 void network_unregister_sock(server *srv, server_socket *srv_socket) { 889 fdnode *fdn = srv_socket->fdn; 890 if (NULL == fdn) return; 891 fdevent_fdnode_event_del(srv->ev, fdn); 892 fdevent_unregister(srv->ev, fdn->fd); 893 srv_socket->fdn = NULL; 894 } 895 896 int network_register_fdevents(server *srv) { 897 if (-1 == fdevent_reset(srv->ev)) { 898 return -1; 899 } 900 901 if (srv->sockets_disabled) return 0; /* lighttpd -1 (one-shot mode) */ 902 903 /* register fdevents after reset */ 904 for (uint32_t i = 0; i < srv->srv_sockets.used; ++i) { 905 server_socket *srv_socket = srv->srv_sockets.ptr[i]; 906 907 srv_socket->fdn = fdevent_register(srv->ev, srv_socket->fd, network_server_handle_fdevent, srv_socket); 908 fdevent_fdnode_event_set(srv->ev, srv_socket->fdn, FDEVENT_IN); 909 } 910 return 0; 911 } 912