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