1 /* 2 * inet and unix socket functions for qemu 3 * 4 * (c) 2008 Gerd Hoffmann <kraxel@redhat.com> 5 * 6 * This program is free software; you can redistribute it and/or modify 7 * it under the terms of the GNU General Public License as published by 8 * the Free Software Foundation; under version 2 of the License. 9 * 10 * This program is distributed in the hope that it will be useful, 11 * but WITHOUT ANY WARRANTY; without even the implied warranty of 12 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the 13 * GNU General Public License for more details. 14 * 15 * Contributions after 2012-01-13 are licensed under the terms of the 16 * GNU GPL, version 2 or (at your option) any later version. 17 */ 18 #include "qemu/osdep.h" 19 20 #ifdef CONFIG_AF_VSOCK 21 #include <linux/vm_sockets.h> 22 #endif /* CONFIG_AF_VSOCK */ 23 24 #include "qemu-common.h" 25 #include "monitor/monitor.h" 26 #include "qapi/clone-visitor.h" 27 #include "qapi/error.h" 28 #include "qapi/qapi-visit-sockets.h" 29 #include "qemu/sockets.h" 30 #include "qemu/main-loop.h" 31 #include "qapi/qobject-input-visitor.h" 32 #include "qapi/qobject-output-visitor.h" 33 #include "qemu/cutils.h" 34 #include "trace.h" 35 36 #ifndef AI_ADDRCONFIG 37 # define AI_ADDRCONFIG 0 38 #endif 39 40 #ifndef AI_V4MAPPED 41 # define AI_V4MAPPED 0 42 #endif 43 44 #ifndef AI_NUMERICSERV 45 # define AI_NUMERICSERV 0 46 #endif 47 48 49 static int inet_getport(struct addrinfo *e) 50 { 51 struct sockaddr_in *i4; 52 struct sockaddr_in6 *i6; 53 54 switch (e->ai_family) { 55 case PF_INET6: 56 i6 = (void*)e->ai_addr; 57 return ntohs(i6->sin6_port); 58 case PF_INET: 59 i4 = (void*)e->ai_addr; 60 return ntohs(i4->sin_port); 61 default: 62 return 0; 63 } 64 } 65 66 static void inet_setport(struct addrinfo *e, int port) 67 { 68 struct sockaddr_in *i4; 69 struct sockaddr_in6 *i6; 70 71 switch (e->ai_family) { 72 case PF_INET6: 73 i6 = (void*)e->ai_addr; 74 i6->sin6_port = htons(port); 75 break; 76 case PF_INET: 77 i4 = (void*)e->ai_addr; 78 i4->sin_port = htons(port); 79 break; 80 } 81 } 82 83 NetworkAddressFamily inet_netfamily(int family) 84 { 85 switch (family) { 86 case PF_INET6: return NETWORK_ADDRESS_FAMILY_IPV6; 87 case PF_INET: return NETWORK_ADDRESS_FAMILY_IPV4; 88 case PF_UNIX: return NETWORK_ADDRESS_FAMILY_UNIX; 89 #ifdef CONFIG_AF_VSOCK 90 case PF_VSOCK: return NETWORK_ADDRESS_FAMILY_VSOCK; 91 #endif /* CONFIG_AF_VSOCK */ 92 } 93 return NETWORK_ADDRESS_FAMILY_UNKNOWN; 94 } 95 96 bool fd_is_socket(int fd) 97 { 98 int optval; 99 socklen_t optlen = sizeof(optval); 100 return !qemu_getsockopt(fd, SOL_SOCKET, SO_TYPE, &optval, &optlen); 101 } 102 103 104 /* 105 * Matrix we're trying to apply 106 * 107 * ipv4 ipv6 family 108 * - - PF_UNSPEC 109 * - f PF_INET 110 * - t PF_INET6 111 * f - PF_INET6 112 * f f <error> 113 * f t PF_INET6 114 * t - PF_INET 115 * t f PF_INET 116 * t t PF_INET6/PF_UNSPEC 117 * 118 * NB, this matrix is only about getting the necessary results 119 * from getaddrinfo(). Some of the cases require further work 120 * after reading results from getaddrinfo in order to fully 121 * apply the logic the end user wants. 122 * 123 * In the first and last cases, we must set IPV6_V6ONLY=0 124 * when binding, to allow a single listener to potentially 125 * accept both IPv4+6 addresses. 126 */ 127 int inet_ai_family_from_address(InetSocketAddress *addr, 128 Error **errp) 129 { 130 if (addr->has_ipv6 && addr->has_ipv4 && 131 !addr->ipv6 && !addr->ipv4) { 132 error_setg(errp, "Cannot disable IPv4 and IPv6 at same time"); 133 return PF_UNSPEC; 134 } 135 if ((addr->has_ipv6 && addr->ipv6) && (addr->has_ipv4 && addr->ipv4)) { 136 /* 137 * Some backends can only do a single listener. In that case 138 * we want empty hostname to resolve to "::" and then use the 139 * flag IPV6_V6ONLY==0 to get both protocols on 1 socket. This 140 * doesn't work for addresses other than "", so they're just 141 * inevitably broken until multiple listeners can be used, 142 * and thus we honour getaddrinfo automatic protocol detection 143 * Once all backends do multi-listener, remove the PF_INET6 144 * branch entirely. 145 */ 146 if (!addr->host || g_str_equal(addr->host, "")) { 147 return PF_INET6; 148 } else { 149 return PF_UNSPEC; 150 } 151 } 152 if ((addr->has_ipv6 && addr->ipv6) || (addr->has_ipv4 && !addr->ipv4)) { 153 return PF_INET6; 154 } 155 if ((addr->has_ipv4 && addr->ipv4) || (addr->has_ipv6 && !addr->ipv6)) { 156 return PF_INET; 157 } 158 return PF_UNSPEC; 159 } 160 161 static int create_fast_reuse_socket(struct addrinfo *e) 162 { 163 int slisten = qemu_socket(e->ai_family, e->ai_socktype, e->ai_protocol); 164 if (slisten < 0) { 165 return -1; 166 } 167 socket_set_fast_reuse(slisten); 168 return slisten; 169 } 170 171 static int try_bind(int socket, InetSocketAddress *saddr, struct addrinfo *e) 172 { 173 #ifndef IPV6_V6ONLY 174 return bind(socket, e->ai_addr, e->ai_addrlen); 175 #else 176 /* 177 * Deals with first & last cases in matrix in comment 178 * for inet_ai_family_from_address(). 179 */ 180 int v6only = 181 ((!saddr->has_ipv4 && !saddr->has_ipv6) || 182 (saddr->has_ipv4 && saddr->ipv4 && 183 saddr->has_ipv6 && saddr->ipv6)) ? 0 : 1; 184 int stat; 185 186 rebind: 187 if (e->ai_family == PF_INET6) { 188 qemu_setsockopt(socket, IPPROTO_IPV6, IPV6_V6ONLY, &v6only, 189 sizeof(v6only)); 190 } 191 192 stat = bind(socket, e->ai_addr, e->ai_addrlen); 193 if (!stat) { 194 return 0; 195 } 196 197 /* If we got EADDRINUSE from an IPv6 bind & v6only is unset, 198 * it could be that the IPv4 port is already claimed, so retry 199 * with v6only set 200 */ 201 if (e->ai_family == PF_INET6 && errno == EADDRINUSE && !v6only) { 202 v6only = 1; 203 goto rebind; 204 } 205 return stat; 206 #endif 207 } 208 209 static int inet_listen_saddr(InetSocketAddress *saddr, 210 int port_offset, 211 int num, 212 Error **errp) 213 { 214 struct addrinfo ai,*res,*e; 215 char port[33]; 216 char uaddr[INET6_ADDRSTRLEN+1]; 217 char uport[33]; 218 int rc, port_min, port_max, p; 219 int slisten = -1; 220 int saved_errno = 0; 221 bool socket_created = false; 222 Error *err = NULL; 223 224 if (saddr->keep_alive) { 225 error_setg(errp, "keep-alive option is not supported for passive " 226 "sockets"); 227 return -1; 228 } 229 230 memset(&ai,0, sizeof(ai)); 231 ai.ai_flags = AI_PASSIVE; 232 if (saddr->has_numeric && saddr->numeric) { 233 ai.ai_flags |= AI_NUMERICHOST | AI_NUMERICSERV; 234 } 235 ai.ai_family = inet_ai_family_from_address(saddr, &err); 236 ai.ai_socktype = SOCK_STREAM; 237 238 if (err) { 239 error_propagate(errp, err); 240 return -1; 241 } 242 243 if (saddr->host == NULL) { 244 error_setg(errp, "host not specified"); 245 return -1; 246 } 247 if (saddr->port != NULL) { 248 pstrcpy(port, sizeof(port), saddr->port); 249 } else { 250 port[0] = '\0'; 251 } 252 253 /* lookup */ 254 if (port_offset) { 255 unsigned long long baseport; 256 if (strlen(port) == 0) { 257 error_setg(errp, "port not specified"); 258 return -1; 259 } 260 if (parse_uint_full(port, &baseport, 10) < 0) { 261 error_setg(errp, "can't convert to a number: %s", port); 262 return -1; 263 } 264 if (baseport > 65535 || 265 baseport + port_offset > 65535) { 266 error_setg(errp, "port %s out of range", port); 267 return -1; 268 } 269 snprintf(port, sizeof(port), "%d", (int)baseport + port_offset); 270 } 271 rc = getaddrinfo(strlen(saddr->host) ? saddr->host : NULL, 272 strlen(port) ? port : NULL, &ai, &res); 273 if (rc != 0) { 274 error_setg(errp, "address resolution failed for %s:%s: %s", 275 saddr->host, port, gai_strerror(rc)); 276 return -1; 277 } 278 279 /* create socket + bind/listen */ 280 for (e = res; e != NULL; e = e->ai_next) { 281 #ifdef IPPROTO_MPTCP 282 if (saddr->has_mptcp && saddr->mptcp) { 283 e->ai_protocol = IPPROTO_MPTCP; 284 } 285 #endif 286 getnameinfo((struct sockaddr*)e->ai_addr,e->ai_addrlen, 287 uaddr,INET6_ADDRSTRLEN,uport,32, 288 NI_NUMERICHOST | NI_NUMERICSERV); 289 290 port_min = inet_getport(e); 291 port_max = saddr->has_to ? saddr->to + port_offset : port_min; 292 for (p = port_min; p <= port_max; p++) { 293 inet_setport(e, p); 294 295 slisten = create_fast_reuse_socket(e); 296 if (slisten < 0) { 297 /* First time we expect we might fail to create the socket 298 * eg if 'e' has AF_INET6 but ipv6 kmod is not loaded. 299 * Later iterations should always succeed if first iteration 300 * worked though, so treat that as fatal. 301 */ 302 if (p == port_min) { 303 continue; 304 } else { 305 error_setg_errno(errp, errno, 306 "Failed to recreate failed listening socket"); 307 goto listen_failed; 308 } 309 } 310 socket_created = true; 311 312 rc = try_bind(slisten, saddr, e); 313 if (rc < 0) { 314 if (errno != EADDRINUSE) { 315 error_setg_errno(errp, errno, "Failed to bind socket"); 316 goto listen_failed; 317 } 318 } else { 319 if (!listen(slisten, num)) { 320 goto listen_ok; 321 } 322 if (errno != EADDRINUSE) { 323 error_setg_errno(errp, errno, "Failed to listen on socket"); 324 goto listen_failed; 325 } 326 } 327 /* Someone else managed to bind to the same port and beat us 328 * to listen on it! Socket semantics does not allow us to 329 * recover from this situation, so we need to recreate the 330 * socket to allow bind attempts for subsequent ports: 331 */ 332 closesocket(slisten); 333 slisten = -1; 334 } 335 } 336 error_setg_errno(errp, errno, 337 socket_created ? 338 "Failed to find an available port" : 339 "Failed to create a socket"); 340 listen_failed: 341 saved_errno = errno; 342 if (slisten >= 0) { 343 closesocket(slisten); 344 } 345 freeaddrinfo(res); 346 errno = saved_errno; 347 return -1; 348 349 listen_ok: 350 freeaddrinfo(res); 351 return slisten; 352 } 353 354 #ifdef _WIN32 355 #define QEMU_SOCKET_RC_INPROGRESS(rc) \ 356 ((rc) == -EINPROGRESS || (rc) == -EWOULDBLOCK || (rc) == -WSAEALREADY) 357 #else 358 #define QEMU_SOCKET_RC_INPROGRESS(rc) \ 359 ((rc) == -EINPROGRESS) 360 #endif 361 362 static int inet_connect_addr(const InetSocketAddress *saddr, 363 struct addrinfo *addr, Error **errp) 364 { 365 int sock, rc; 366 367 sock = qemu_socket(addr->ai_family, addr->ai_socktype, addr->ai_protocol); 368 if (sock < 0) { 369 error_setg_errno(errp, errno, "Failed to create socket family %d", 370 addr->ai_family); 371 return -1; 372 } 373 socket_set_fast_reuse(sock); 374 375 /* connect to peer */ 376 do { 377 rc = 0; 378 if (connect(sock, addr->ai_addr, addr->ai_addrlen) < 0) { 379 rc = -errno; 380 } 381 } while (rc == -EINTR); 382 383 if (rc < 0) { 384 error_setg_errno(errp, errno, "Failed to connect to '%s:%s'", 385 saddr->host, saddr->port); 386 closesocket(sock); 387 return -1; 388 } 389 390 return sock; 391 } 392 393 static struct addrinfo *inet_parse_connect_saddr(InetSocketAddress *saddr, 394 Error **errp) 395 { 396 struct addrinfo ai, *res; 397 int rc; 398 Error *err = NULL; 399 static int useV4Mapped = 1; 400 401 memset(&ai, 0, sizeof(ai)); 402 403 ai.ai_flags = AI_CANONNAME | AI_ADDRCONFIG; 404 if (qatomic_read(&useV4Mapped)) { 405 ai.ai_flags |= AI_V4MAPPED; 406 } 407 ai.ai_family = inet_ai_family_from_address(saddr, &err); 408 ai.ai_socktype = SOCK_STREAM; 409 410 if (err) { 411 error_propagate(errp, err); 412 return NULL; 413 } 414 415 if (saddr->host == NULL || saddr->port == NULL) { 416 error_setg(errp, "host and/or port not specified"); 417 return NULL; 418 } 419 420 /* lookup */ 421 rc = getaddrinfo(saddr->host, saddr->port, &ai, &res); 422 423 /* At least FreeBSD and OS-X 10.6 declare AI_V4MAPPED but 424 * then don't implement it in their getaddrinfo(). Detect 425 * this and retry without the flag since that's preferable 426 * to a fatal error 427 */ 428 if (rc == EAI_BADFLAGS && 429 (ai.ai_flags & AI_V4MAPPED)) { 430 qatomic_set(&useV4Mapped, 0); 431 ai.ai_flags &= ~AI_V4MAPPED; 432 rc = getaddrinfo(saddr->host, saddr->port, &ai, &res); 433 } 434 if (rc != 0) { 435 error_setg(errp, "address resolution failed for %s:%s: %s", 436 saddr->host, saddr->port, gai_strerror(rc)); 437 return NULL; 438 } 439 return res; 440 } 441 442 /** 443 * Create a socket and connect it to an address. 444 * 445 * @saddr: Inet socket address specification 446 * @errp: set on error 447 * 448 * Returns: -1 on error, file descriptor on success. 449 */ 450 int inet_connect_saddr(InetSocketAddress *saddr, Error **errp) 451 { 452 Error *local_err = NULL; 453 struct addrinfo *res, *e; 454 int sock = -1; 455 456 res = inet_parse_connect_saddr(saddr, errp); 457 if (!res) { 458 return -1; 459 } 460 461 for (e = res; e != NULL; e = e->ai_next) { 462 error_free(local_err); 463 local_err = NULL; 464 465 #ifdef IPPROTO_MPTCP 466 if (saddr->has_mptcp && saddr->mptcp) { 467 e->ai_protocol = IPPROTO_MPTCP; 468 } 469 #endif 470 471 sock = inet_connect_addr(saddr, e, &local_err); 472 if (sock >= 0) { 473 break; 474 } 475 } 476 477 freeaddrinfo(res); 478 479 if (sock < 0) { 480 error_propagate(errp, local_err); 481 return sock; 482 } 483 484 if (saddr->keep_alive) { 485 int val = 1; 486 int ret = qemu_setsockopt(sock, SOL_SOCKET, SO_KEEPALIVE, 487 &val, sizeof(val)); 488 489 if (ret < 0) { 490 error_setg_errno(errp, errno, "Unable to set KEEPALIVE"); 491 close(sock); 492 return -1; 493 } 494 } 495 496 return sock; 497 } 498 499 static int inet_dgram_saddr(InetSocketAddress *sraddr, 500 InetSocketAddress *sladdr, 501 Error **errp) 502 { 503 struct addrinfo ai, *peer = NULL, *local = NULL; 504 const char *addr; 505 const char *port; 506 int sock = -1, rc; 507 Error *err = NULL; 508 509 /* lookup peer addr */ 510 memset(&ai,0, sizeof(ai)); 511 ai.ai_flags = AI_CANONNAME | AI_V4MAPPED | AI_ADDRCONFIG; 512 ai.ai_family = inet_ai_family_from_address(sraddr, &err); 513 ai.ai_socktype = SOCK_DGRAM; 514 515 if (err) { 516 error_propagate(errp, err); 517 goto err; 518 } 519 520 addr = sraddr->host; 521 port = sraddr->port; 522 if (addr == NULL || strlen(addr) == 0) { 523 addr = "localhost"; 524 } 525 if (port == NULL || strlen(port) == 0) { 526 error_setg(errp, "remote port not specified"); 527 goto err; 528 } 529 530 if ((rc = getaddrinfo(addr, port, &ai, &peer)) != 0) { 531 error_setg(errp, "address resolution failed for %s:%s: %s", addr, port, 532 gai_strerror(rc)); 533 goto err; 534 } 535 536 /* lookup local addr */ 537 memset(&ai,0, sizeof(ai)); 538 ai.ai_flags = AI_PASSIVE; 539 ai.ai_family = peer->ai_family; 540 ai.ai_socktype = SOCK_DGRAM; 541 542 if (sladdr) { 543 addr = sladdr->host; 544 port = sladdr->port; 545 if (addr == NULL || strlen(addr) == 0) { 546 addr = NULL; 547 } 548 if (!port || strlen(port) == 0) { 549 port = "0"; 550 } 551 } else { 552 addr = NULL; 553 port = "0"; 554 } 555 556 if ((rc = getaddrinfo(addr, port, &ai, &local)) != 0) { 557 error_setg(errp, "address resolution failed for %s:%s: %s", addr, port, 558 gai_strerror(rc)); 559 goto err; 560 } 561 562 /* create socket */ 563 sock = qemu_socket(peer->ai_family, peer->ai_socktype, peer->ai_protocol); 564 if (sock < 0) { 565 error_setg_errno(errp, errno, "Failed to create socket family %d", 566 peer->ai_family); 567 goto err; 568 } 569 socket_set_fast_reuse(sock); 570 571 /* bind socket */ 572 if (bind(sock, local->ai_addr, local->ai_addrlen) < 0) { 573 error_setg_errno(errp, errno, "Failed to bind socket"); 574 goto err; 575 } 576 577 /* connect to peer */ 578 if (connect(sock,peer->ai_addr,peer->ai_addrlen) < 0) { 579 error_setg_errno(errp, errno, "Failed to connect to '%s:%s'", 580 addr, port); 581 goto err; 582 } 583 584 freeaddrinfo(local); 585 freeaddrinfo(peer); 586 return sock; 587 588 err: 589 if (sock != -1) { 590 closesocket(sock); 591 } 592 if (local) { 593 freeaddrinfo(local); 594 } 595 if (peer) { 596 freeaddrinfo(peer); 597 } 598 599 return -1; 600 } 601 602 /* compatibility wrapper */ 603 static int inet_parse_flag(const char *flagname, const char *optstr, bool *val, 604 Error **errp) 605 { 606 char *end; 607 size_t len; 608 609 end = strstr(optstr, ","); 610 if (end) { 611 if (end[1] == ',') { /* Reject 'ipv6=on,,foo' */ 612 error_setg(errp, "error parsing '%s' flag '%s'", flagname, optstr); 613 return -1; 614 } 615 len = end - optstr; 616 } else { 617 len = strlen(optstr); 618 } 619 if (len == 0 || (len == 3 && strncmp(optstr, "=on", len) == 0)) { 620 *val = true; 621 } else if (len == 4 && strncmp(optstr, "=off", len) == 0) { 622 *val = false; 623 } else { 624 error_setg(errp, "error parsing '%s' flag '%s'", flagname, optstr); 625 return -1; 626 } 627 return 0; 628 } 629 630 int inet_parse(InetSocketAddress *addr, const char *str, Error **errp) 631 { 632 const char *optstr, *h; 633 char host[65]; 634 char port[33]; 635 int to; 636 int pos; 637 char *begin; 638 639 memset(addr, 0, sizeof(*addr)); 640 641 /* parse address */ 642 if (str[0] == ':') { 643 /* no host given */ 644 host[0] = '\0'; 645 if (sscanf(str, ":%32[^,]%n", port, &pos) != 1) { 646 error_setg(errp, "error parsing port in address '%s'", str); 647 return -1; 648 } 649 } else if (str[0] == '[') { 650 /* IPv6 addr */ 651 if (sscanf(str, "[%64[^]]]:%32[^,]%n", host, port, &pos) != 2) { 652 error_setg(errp, "error parsing IPv6 address '%s'", str); 653 return -1; 654 } 655 } else { 656 /* hostname or IPv4 addr */ 657 if (sscanf(str, "%64[^:]:%32[^,]%n", host, port, &pos) != 2) { 658 error_setg(errp, "error parsing address '%s'", str); 659 return -1; 660 } 661 } 662 663 addr->host = g_strdup(host); 664 addr->port = g_strdup(port); 665 666 /* parse options */ 667 optstr = str + pos; 668 h = strstr(optstr, ",to="); 669 if (h) { 670 h += 4; 671 if (sscanf(h, "%d%n", &to, &pos) != 1 || 672 (h[pos] != '\0' && h[pos] != ',')) { 673 error_setg(errp, "error parsing to= argument"); 674 return -1; 675 } 676 addr->has_to = true; 677 addr->to = to; 678 } 679 begin = strstr(optstr, ",ipv4"); 680 if (begin) { 681 if (inet_parse_flag("ipv4", begin + 5, &addr->ipv4, errp) < 0) { 682 return -1; 683 } 684 addr->has_ipv4 = true; 685 } 686 begin = strstr(optstr, ",ipv6"); 687 if (begin) { 688 if (inet_parse_flag("ipv6", begin + 5, &addr->ipv6, errp) < 0) { 689 return -1; 690 } 691 addr->has_ipv6 = true; 692 } 693 begin = strstr(optstr, ",keep-alive"); 694 if (begin) { 695 if (inet_parse_flag("keep-alive", begin + strlen(",keep-alive"), 696 &addr->keep_alive, errp) < 0) 697 { 698 return -1; 699 } 700 addr->has_keep_alive = true; 701 } 702 #ifdef IPPROTO_MPTCP 703 begin = strstr(optstr, ",mptcp"); 704 if (begin) { 705 if (inet_parse_flag("mptcp", begin + strlen(",mptcp"), 706 &addr->mptcp, errp) < 0) 707 { 708 return -1; 709 } 710 addr->has_mptcp = true; 711 } 712 #endif 713 return 0; 714 } 715 716 717 /** 718 * Create a blocking socket and connect it to an address. 719 * 720 * @str: address string 721 * @errp: set in case of an error 722 * 723 * Returns -1 in case of error, file descriptor on success 724 **/ 725 int inet_connect(const char *str, Error **errp) 726 { 727 int sock = -1; 728 InetSocketAddress *addr = g_new(InetSocketAddress, 1); 729 730 if (!inet_parse(addr, str, errp)) { 731 sock = inet_connect_saddr(addr, errp); 732 } 733 qapi_free_InetSocketAddress(addr); 734 return sock; 735 } 736 737 #ifdef CONFIG_AF_VSOCK 738 static bool vsock_parse_vaddr_to_sockaddr(const VsockSocketAddress *vaddr, 739 struct sockaddr_vm *svm, 740 Error **errp) 741 { 742 unsigned long long val; 743 744 memset(svm, 0, sizeof(*svm)); 745 svm->svm_family = AF_VSOCK; 746 747 if (parse_uint_full(vaddr->cid, &val, 10) < 0 || 748 val > UINT32_MAX) { 749 error_setg(errp, "Failed to parse cid '%s'", vaddr->cid); 750 return false; 751 } 752 svm->svm_cid = val; 753 754 if (parse_uint_full(vaddr->port, &val, 10) < 0 || 755 val > UINT32_MAX) { 756 error_setg(errp, "Failed to parse port '%s'", vaddr->port); 757 return false; 758 } 759 svm->svm_port = val; 760 761 return true; 762 } 763 764 static int vsock_connect_addr(const VsockSocketAddress *vaddr, 765 const struct sockaddr_vm *svm, Error **errp) 766 { 767 int sock, rc; 768 769 sock = qemu_socket(AF_VSOCK, SOCK_STREAM, 0); 770 if (sock < 0) { 771 error_setg_errno(errp, errno, "Failed to create socket family %d", 772 AF_VSOCK); 773 return -1; 774 } 775 776 /* connect to peer */ 777 do { 778 rc = 0; 779 if (connect(sock, (const struct sockaddr *)svm, sizeof(*svm)) < 0) { 780 rc = -errno; 781 } 782 } while (rc == -EINTR); 783 784 if (rc < 0) { 785 error_setg_errno(errp, errno, "Failed to connect to '%s:%s'", 786 vaddr->cid, vaddr->port); 787 closesocket(sock); 788 return -1; 789 } 790 791 return sock; 792 } 793 794 static int vsock_connect_saddr(VsockSocketAddress *vaddr, Error **errp) 795 { 796 struct sockaddr_vm svm; 797 798 if (!vsock_parse_vaddr_to_sockaddr(vaddr, &svm, errp)) { 799 return -1; 800 } 801 802 return vsock_connect_addr(vaddr, &svm, errp); 803 } 804 805 static int vsock_listen_saddr(VsockSocketAddress *vaddr, 806 int num, 807 Error **errp) 808 { 809 struct sockaddr_vm svm; 810 int slisten; 811 812 if (!vsock_parse_vaddr_to_sockaddr(vaddr, &svm, errp)) { 813 return -1; 814 } 815 816 slisten = qemu_socket(AF_VSOCK, SOCK_STREAM, 0); 817 if (slisten < 0) { 818 error_setg_errno(errp, errno, "Failed to create socket"); 819 return -1; 820 } 821 822 if (bind(slisten, (const struct sockaddr *)&svm, sizeof(svm)) != 0) { 823 error_setg_errno(errp, errno, "Failed to bind socket"); 824 closesocket(slisten); 825 return -1; 826 } 827 828 if (listen(slisten, num) != 0) { 829 error_setg_errno(errp, errno, "Failed to listen on socket"); 830 closesocket(slisten); 831 return -1; 832 } 833 return slisten; 834 } 835 836 static int vsock_parse(VsockSocketAddress *addr, const char *str, 837 Error **errp) 838 { 839 char cid[33]; 840 char port[33]; 841 int n; 842 843 if (sscanf(str, "%32[^:]:%32[^,]%n", cid, port, &n) != 2) { 844 error_setg(errp, "error parsing address '%s'", str); 845 return -1; 846 } 847 if (str[n] != '\0') { 848 error_setg(errp, "trailing characters in address '%s'", str); 849 return -1; 850 } 851 852 addr->cid = g_strdup(cid); 853 addr->port = g_strdup(port); 854 return 0; 855 } 856 #else 857 static void vsock_unsupported(Error **errp) 858 { 859 error_setg(errp, "socket family AF_VSOCK unsupported"); 860 } 861 862 static int vsock_connect_saddr(VsockSocketAddress *vaddr, Error **errp) 863 { 864 vsock_unsupported(errp); 865 return -1; 866 } 867 868 static int vsock_listen_saddr(VsockSocketAddress *vaddr, 869 int num, 870 Error **errp) 871 { 872 vsock_unsupported(errp); 873 return -1; 874 } 875 876 static int vsock_parse(VsockSocketAddress *addr, const char *str, 877 Error **errp) 878 { 879 vsock_unsupported(errp); 880 return -1; 881 } 882 #endif /* CONFIG_AF_VSOCK */ 883 884 #ifndef _WIN32 885 886 static bool saddr_is_abstract(UnixSocketAddress *saddr) 887 { 888 #ifdef CONFIG_LINUX 889 return saddr->abstract; 890 #else 891 return false; 892 #endif 893 } 894 895 static bool saddr_is_tight(UnixSocketAddress *saddr) 896 { 897 #ifdef CONFIG_LINUX 898 return !saddr->has_tight || saddr->tight; 899 #else 900 return false; 901 #endif 902 } 903 904 static int unix_listen_saddr(UnixSocketAddress *saddr, 905 int num, 906 Error **errp) 907 { 908 bool abstract = saddr_is_abstract(saddr); 909 struct sockaddr_un un; 910 int sock, fd; 911 char *pathbuf = NULL; 912 const char *path; 913 size_t pathlen; 914 size_t addrlen; 915 916 sock = qemu_socket(PF_UNIX, SOCK_STREAM, 0); 917 if (sock < 0) { 918 error_setg_errno(errp, errno, "Failed to create Unix socket"); 919 return -1; 920 } 921 922 if (saddr->path[0] || abstract) { 923 path = saddr->path; 924 } else { 925 const char *tmpdir = getenv("TMPDIR"); 926 tmpdir = tmpdir ? tmpdir : "/tmp"; 927 path = pathbuf = g_strdup_printf("%s/qemu-socket-XXXXXX", tmpdir); 928 } 929 930 pathlen = strlen(path); 931 if (pathlen > sizeof(un.sun_path) || 932 (abstract && pathlen > (sizeof(un.sun_path) - 1))) { 933 error_setg(errp, "UNIX socket path '%s' is too long", path); 934 error_append_hint(errp, "Path must be less than %zu bytes\n", 935 abstract ? sizeof(un.sun_path) - 1 : 936 sizeof(un.sun_path)); 937 goto err; 938 } 939 940 if (pathbuf != NULL) { 941 /* 942 * This dummy fd usage silences the mktemp() unsecure warning. 943 * Using mkstemp() doesn't make things more secure here 944 * though. bind() complains about existing files, so we have 945 * to unlink first and thus re-open the race window. The 946 * worst case possible is bind() failing, i.e. a DoS attack. 947 */ 948 fd = mkstemp(pathbuf); 949 if (fd < 0) { 950 error_setg_errno(errp, errno, 951 "Failed to make a temporary socket %s", pathbuf); 952 goto err; 953 } 954 close(fd); 955 } 956 957 if (!abstract && unlink(path) < 0 && errno != ENOENT) { 958 error_setg_errno(errp, errno, 959 "Failed to unlink socket %s", path); 960 goto err; 961 } 962 963 memset(&un, 0, sizeof(un)); 964 un.sun_family = AF_UNIX; 965 addrlen = sizeof(un); 966 967 if (abstract) { 968 un.sun_path[0] = '\0'; 969 memcpy(&un.sun_path[1], path, pathlen); 970 if (saddr_is_tight(saddr)) { 971 addrlen = offsetof(struct sockaddr_un, sun_path) + 1 + pathlen; 972 } 973 } else { 974 memcpy(un.sun_path, path, pathlen); 975 } 976 977 if (bind(sock, (struct sockaddr *) &un, addrlen) < 0) { 978 error_setg_errno(errp, errno, "Failed to bind socket to %s", path); 979 goto err; 980 } 981 if (listen(sock, num) < 0) { 982 error_setg_errno(errp, errno, "Failed to listen on socket"); 983 goto err; 984 } 985 986 g_free(pathbuf); 987 return sock; 988 989 err: 990 g_free(pathbuf); 991 closesocket(sock); 992 return -1; 993 } 994 995 static int unix_connect_saddr(UnixSocketAddress *saddr, Error **errp) 996 { 997 bool abstract = saddr_is_abstract(saddr); 998 struct sockaddr_un un; 999 int sock, rc; 1000 size_t pathlen; 1001 size_t addrlen; 1002 1003 if (saddr->path == NULL) { 1004 error_setg(errp, "unix connect: no path specified"); 1005 return -1; 1006 } 1007 1008 sock = qemu_socket(PF_UNIX, SOCK_STREAM, 0); 1009 if (sock < 0) { 1010 error_setg_errno(errp, errno, "Failed to create socket"); 1011 return -1; 1012 } 1013 1014 pathlen = strlen(saddr->path); 1015 if (pathlen > sizeof(un.sun_path) || 1016 (abstract && pathlen > (sizeof(un.sun_path) - 1))) { 1017 error_setg(errp, "UNIX socket path '%s' is too long", saddr->path); 1018 error_append_hint(errp, "Path must be less than %zu bytes\n", 1019 abstract ? sizeof(un.sun_path) - 1 : 1020 sizeof(un.sun_path)); 1021 goto err; 1022 } 1023 1024 memset(&un, 0, sizeof(un)); 1025 un.sun_family = AF_UNIX; 1026 addrlen = sizeof(un); 1027 1028 if (abstract) { 1029 un.sun_path[0] = '\0'; 1030 memcpy(&un.sun_path[1], saddr->path, pathlen); 1031 if (saddr_is_tight(saddr)) { 1032 addrlen = offsetof(struct sockaddr_un, sun_path) + 1 + pathlen; 1033 } 1034 } else { 1035 memcpy(un.sun_path, saddr->path, pathlen); 1036 } 1037 /* connect to peer */ 1038 do { 1039 rc = 0; 1040 if (connect(sock, (struct sockaddr *) &un, addrlen) < 0) { 1041 rc = -errno; 1042 } 1043 } while (rc == -EINTR); 1044 1045 if (rc < 0) { 1046 error_setg_errno(errp, -rc, "Failed to connect to '%s'", 1047 saddr->path); 1048 goto err; 1049 } 1050 1051 return sock; 1052 1053 err: 1054 close(sock); 1055 return -1; 1056 } 1057 1058 #else 1059 1060 static int unix_listen_saddr(UnixSocketAddress *saddr, 1061 int num, 1062 Error **errp) 1063 { 1064 error_setg(errp, "unix sockets are not available on windows"); 1065 errno = ENOTSUP; 1066 return -1; 1067 } 1068 1069 static int unix_connect_saddr(UnixSocketAddress *saddr, Error **errp) 1070 { 1071 error_setg(errp, "unix sockets are not available on windows"); 1072 errno = ENOTSUP; 1073 return -1; 1074 } 1075 #endif 1076 1077 /* compatibility wrapper */ 1078 int unix_listen(const char *str, Error **errp) 1079 { 1080 UnixSocketAddress *saddr; 1081 int sock; 1082 1083 saddr = g_new0(UnixSocketAddress, 1); 1084 saddr->path = g_strdup(str); 1085 sock = unix_listen_saddr(saddr, 1, errp); 1086 qapi_free_UnixSocketAddress(saddr); 1087 return sock; 1088 } 1089 1090 int unix_connect(const char *path, Error **errp) 1091 { 1092 UnixSocketAddress *saddr; 1093 int sock; 1094 1095 saddr = g_new0(UnixSocketAddress, 1); 1096 saddr->path = g_strdup(path); 1097 sock = unix_connect_saddr(saddr, errp); 1098 qapi_free_UnixSocketAddress(saddr); 1099 return sock; 1100 } 1101 1102 1103 SocketAddress *socket_parse(const char *str, Error **errp) 1104 { 1105 SocketAddress *addr; 1106 1107 addr = g_new0(SocketAddress, 1); 1108 if (strstart(str, "unix:", NULL)) { 1109 if (str[5] == '\0') { 1110 error_setg(errp, "invalid Unix socket address"); 1111 goto fail; 1112 } else { 1113 addr->type = SOCKET_ADDRESS_TYPE_UNIX; 1114 addr->u.q_unix.path = g_strdup(str + 5); 1115 } 1116 } else if (strstart(str, "fd:", NULL)) { 1117 if (str[3] == '\0') { 1118 error_setg(errp, "invalid file descriptor address"); 1119 goto fail; 1120 } else { 1121 addr->type = SOCKET_ADDRESS_TYPE_FD; 1122 addr->u.fd.str = g_strdup(str + 3); 1123 } 1124 } else if (strstart(str, "vsock:", NULL)) { 1125 addr->type = SOCKET_ADDRESS_TYPE_VSOCK; 1126 if (vsock_parse(&addr->u.vsock, str + strlen("vsock:"), errp)) { 1127 goto fail; 1128 } 1129 } else { 1130 addr->type = SOCKET_ADDRESS_TYPE_INET; 1131 if (inet_parse(&addr->u.inet, str, errp)) { 1132 goto fail; 1133 } 1134 } 1135 return addr; 1136 1137 fail: 1138 qapi_free_SocketAddress(addr); 1139 return NULL; 1140 } 1141 1142 static int socket_get_fd(const char *fdstr, Error **errp) 1143 { 1144 Monitor *cur_mon = monitor_cur(); 1145 int fd; 1146 if (cur_mon) { 1147 fd = monitor_get_fd(cur_mon, fdstr, errp); 1148 if (fd < 0) { 1149 return -1; 1150 } 1151 } else { 1152 if (qemu_strtoi(fdstr, NULL, 10, &fd) < 0) { 1153 error_setg_errno(errp, errno, 1154 "Unable to parse FD number %s", 1155 fdstr); 1156 return -1; 1157 } 1158 } 1159 if (!fd_is_socket(fd)) { 1160 error_setg(errp, "File descriptor '%s' is not a socket", fdstr); 1161 close(fd); 1162 return -1; 1163 } 1164 return fd; 1165 } 1166 1167 int socket_address_parse_named_fd(SocketAddress *addr, Error **errp) 1168 { 1169 int fd; 1170 1171 if (addr->type != SOCKET_ADDRESS_TYPE_FD) { 1172 return 0; 1173 } 1174 1175 fd = socket_get_fd(addr->u.fd.str, errp); 1176 if (fd < 0) { 1177 return fd; 1178 } 1179 1180 g_free(addr->u.fd.str); 1181 addr->u.fd.str = g_strdup_printf("%d", fd); 1182 1183 return 0; 1184 } 1185 1186 int socket_connect(SocketAddress *addr, Error **errp) 1187 { 1188 int fd; 1189 1190 switch (addr->type) { 1191 case SOCKET_ADDRESS_TYPE_INET: 1192 fd = inet_connect_saddr(&addr->u.inet, errp); 1193 break; 1194 1195 case SOCKET_ADDRESS_TYPE_UNIX: 1196 fd = unix_connect_saddr(&addr->u.q_unix, errp); 1197 break; 1198 1199 case SOCKET_ADDRESS_TYPE_FD: 1200 fd = socket_get_fd(addr->u.fd.str, errp); 1201 break; 1202 1203 case SOCKET_ADDRESS_TYPE_VSOCK: 1204 fd = vsock_connect_saddr(&addr->u.vsock, errp); 1205 break; 1206 1207 default: 1208 abort(); 1209 } 1210 return fd; 1211 } 1212 1213 int socket_listen(SocketAddress *addr, int num, Error **errp) 1214 { 1215 int fd; 1216 1217 trace_socket_listen(num); 1218 switch (addr->type) { 1219 case SOCKET_ADDRESS_TYPE_INET: 1220 fd = inet_listen_saddr(&addr->u.inet, 0, num, errp); 1221 break; 1222 1223 case SOCKET_ADDRESS_TYPE_UNIX: 1224 fd = unix_listen_saddr(&addr->u.q_unix, num, errp); 1225 break; 1226 1227 case SOCKET_ADDRESS_TYPE_FD: 1228 fd = socket_get_fd(addr->u.fd.str, errp); 1229 if (fd < 0) { 1230 return -1; 1231 } 1232 1233 /* 1234 * If the socket is not yet in the listen state, then transition it to 1235 * the listen state now. 1236 * 1237 * If it's already listening then this updates the backlog value as 1238 * requested. 1239 * 1240 * If this socket cannot listen because it's already in another state 1241 * (e.g. unbound or connected) then we'll catch the error here. 1242 */ 1243 if (listen(fd, num) != 0) { 1244 error_setg_errno(errp, errno, "Failed to listen on fd socket"); 1245 closesocket(fd); 1246 return -1; 1247 } 1248 break; 1249 1250 case SOCKET_ADDRESS_TYPE_VSOCK: 1251 fd = vsock_listen_saddr(&addr->u.vsock, num, errp); 1252 break; 1253 1254 default: 1255 abort(); 1256 } 1257 return fd; 1258 } 1259 1260 void socket_listen_cleanup(int fd, Error **errp) 1261 { 1262 SocketAddress *addr; 1263 1264 addr = socket_local_address(fd, errp); 1265 if (!addr) { 1266 return; 1267 } 1268 1269 if (addr->type == SOCKET_ADDRESS_TYPE_UNIX 1270 && addr->u.q_unix.path) { 1271 if (unlink(addr->u.q_unix.path) < 0 && errno != ENOENT) { 1272 error_setg_errno(errp, errno, 1273 "Failed to unlink socket %s", 1274 addr->u.q_unix.path); 1275 } 1276 } 1277 1278 qapi_free_SocketAddress(addr); 1279 } 1280 1281 int socket_dgram(SocketAddress *remote, SocketAddress *local, Error **errp) 1282 { 1283 int fd; 1284 1285 /* 1286 * TODO SOCKET_ADDRESS_TYPE_FD when fd is AF_INET or AF_INET6 1287 * (although other address families can do SOCK_DGRAM, too) 1288 */ 1289 switch (remote->type) { 1290 case SOCKET_ADDRESS_TYPE_INET: 1291 fd = inet_dgram_saddr(&remote->u.inet, 1292 local ? &local->u.inet : NULL, errp); 1293 break; 1294 1295 default: 1296 error_setg(errp, "socket type unsupported for datagram"); 1297 fd = -1; 1298 } 1299 return fd; 1300 } 1301 1302 1303 static SocketAddress * 1304 socket_sockaddr_to_address_inet(struct sockaddr_storage *sa, 1305 socklen_t salen, 1306 Error **errp) 1307 { 1308 char host[NI_MAXHOST]; 1309 char serv[NI_MAXSERV]; 1310 SocketAddress *addr; 1311 InetSocketAddress *inet; 1312 int ret; 1313 1314 ret = getnameinfo((struct sockaddr *)sa, salen, 1315 host, sizeof(host), 1316 serv, sizeof(serv), 1317 NI_NUMERICHOST | NI_NUMERICSERV); 1318 if (ret != 0) { 1319 error_setg(errp, "Cannot format numeric socket address: %s", 1320 gai_strerror(ret)); 1321 return NULL; 1322 } 1323 1324 addr = g_new0(SocketAddress, 1); 1325 addr->type = SOCKET_ADDRESS_TYPE_INET; 1326 inet = &addr->u.inet; 1327 inet->host = g_strdup(host); 1328 inet->port = g_strdup(serv); 1329 if (sa->ss_family == AF_INET) { 1330 inet->has_ipv4 = inet->ipv4 = true; 1331 } else { 1332 inet->has_ipv6 = inet->ipv6 = true; 1333 } 1334 1335 return addr; 1336 } 1337 1338 1339 #ifndef WIN32 1340 static SocketAddress * 1341 socket_sockaddr_to_address_unix(struct sockaddr_storage *sa, 1342 socklen_t salen, 1343 Error **errp) 1344 { 1345 SocketAddress *addr; 1346 struct sockaddr_un *su = (struct sockaddr_un *)sa; 1347 1348 addr = g_new0(SocketAddress, 1); 1349 addr->type = SOCKET_ADDRESS_TYPE_UNIX; 1350 salen -= offsetof(struct sockaddr_un, sun_path); 1351 #ifdef CONFIG_LINUX 1352 if (salen > 0 && !su->sun_path[0]) { 1353 /* Linux abstract socket */ 1354 addr->u.q_unix.path = g_strndup(su->sun_path + 1, salen - 1); 1355 addr->u.q_unix.has_abstract = true; 1356 addr->u.q_unix.abstract = true; 1357 addr->u.q_unix.has_tight = true; 1358 addr->u.q_unix.tight = salen < sizeof(su->sun_path); 1359 return addr; 1360 } 1361 #endif 1362 1363 addr->u.q_unix.path = g_strndup(su->sun_path, salen); 1364 return addr; 1365 } 1366 #endif /* WIN32 */ 1367 1368 #ifdef CONFIG_AF_VSOCK 1369 static SocketAddress * 1370 socket_sockaddr_to_address_vsock(struct sockaddr_storage *sa, 1371 socklen_t salen, 1372 Error **errp) 1373 { 1374 SocketAddress *addr; 1375 VsockSocketAddress *vaddr; 1376 struct sockaddr_vm *svm = (struct sockaddr_vm *)sa; 1377 1378 addr = g_new0(SocketAddress, 1); 1379 addr->type = SOCKET_ADDRESS_TYPE_VSOCK; 1380 vaddr = &addr->u.vsock; 1381 vaddr->cid = g_strdup_printf("%u", svm->svm_cid); 1382 vaddr->port = g_strdup_printf("%u", svm->svm_port); 1383 1384 return addr; 1385 } 1386 #endif /* CONFIG_AF_VSOCK */ 1387 1388 SocketAddress * 1389 socket_sockaddr_to_address(struct sockaddr_storage *sa, 1390 socklen_t salen, 1391 Error **errp) 1392 { 1393 switch (sa->ss_family) { 1394 case AF_INET: 1395 case AF_INET6: 1396 return socket_sockaddr_to_address_inet(sa, salen, errp); 1397 1398 #ifndef WIN32 1399 case AF_UNIX: 1400 return socket_sockaddr_to_address_unix(sa, salen, errp); 1401 #endif /* WIN32 */ 1402 1403 #ifdef CONFIG_AF_VSOCK 1404 case AF_VSOCK: 1405 return socket_sockaddr_to_address_vsock(sa, salen, errp); 1406 #endif 1407 1408 default: 1409 error_setg(errp, "socket family %d unsupported", 1410 sa->ss_family); 1411 return NULL; 1412 } 1413 return 0; 1414 } 1415 1416 1417 SocketAddress *socket_local_address(int fd, Error **errp) 1418 { 1419 struct sockaddr_storage ss; 1420 socklen_t sslen = sizeof(ss); 1421 1422 if (getsockname(fd, (struct sockaddr *)&ss, &sslen) < 0) { 1423 error_setg_errno(errp, errno, "%s", 1424 "Unable to query local socket address"); 1425 return NULL; 1426 } 1427 1428 return socket_sockaddr_to_address(&ss, sslen, errp); 1429 } 1430 1431 1432 SocketAddress *socket_remote_address(int fd, Error **errp) 1433 { 1434 struct sockaddr_storage ss; 1435 socklen_t sslen = sizeof(ss); 1436 1437 if (getpeername(fd, (struct sockaddr *)&ss, &sslen) < 0) { 1438 error_setg_errno(errp, errno, "%s", 1439 "Unable to query remote socket address"); 1440 return NULL; 1441 } 1442 1443 return socket_sockaddr_to_address(&ss, sslen, errp); 1444 } 1445 1446 1447 SocketAddress *socket_address_flatten(SocketAddressLegacy *addr_legacy) 1448 { 1449 SocketAddress *addr; 1450 1451 if (!addr_legacy) { 1452 return NULL; 1453 } 1454 1455 addr = g_new(SocketAddress, 1); 1456 1457 switch (addr_legacy->type) { 1458 case SOCKET_ADDRESS_LEGACY_KIND_INET: 1459 addr->type = SOCKET_ADDRESS_TYPE_INET; 1460 QAPI_CLONE_MEMBERS(InetSocketAddress, &addr->u.inet, 1461 addr_legacy->u.inet.data); 1462 break; 1463 case SOCKET_ADDRESS_LEGACY_KIND_UNIX: 1464 addr->type = SOCKET_ADDRESS_TYPE_UNIX; 1465 QAPI_CLONE_MEMBERS(UnixSocketAddress, &addr->u.q_unix, 1466 addr_legacy->u.q_unix.data); 1467 break; 1468 case SOCKET_ADDRESS_LEGACY_KIND_VSOCK: 1469 addr->type = SOCKET_ADDRESS_TYPE_VSOCK; 1470 QAPI_CLONE_MEMBERS(VsockSocketAddress, &addr->u.vsock, 1471 addr_legacy->u.vsock.data); 1472 break; 1473 case SOCKET_ADDRESS_LEGACY_KIND_FD: 1474 addr->type = SOCKET_ADDRESS_TYPE_FD; 1475 QAPI_CLONE_MEMBERS(String, &addr->u.fd, addr_legacy->u.fd.data); 1476 break; 1477 default: 1478 abort(); 1479 } 1480 1481 return addr; 1482 } 1483