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 getnameinfo((struct sockaddr*)e->ai_addr,e->ai_addrlen, 282 uaddr,INET6_ADDRSTRLEN,uport,32, 283 NI_NUMERICHOST | NI_NUMERICSERV); 284 285 port_min = inet_getport(e); 286 port_max = saddr->has_to ? saddr->to + port_offset : port_min; 287 for (p = port_min; p <= port_max; p++) { 288 inet_setport(e, p); 289 290 slisten = create_fast_reuse_socket(e); 291 if (slisten < 0) { 292 /* First time we expect we might fail to create the socket 293 * eg if 'e' has AF_INET6 but ipv6 kmod is not loaded. 294 * Later iterations should always succeed if first iteration 295 * worked though, so treat that as fatal. 296 */ 297 if (p == port_min) { 298 continue; 299 } else { 300 error_setg_errno(errp, errno, 301 "Failed to recreate failed listening socket"); 302 goto listen_failed; 303 } 304 } 305 socket_created = true; 306 307 rc = try_bind(slisten, saddr, e); 308 if (rc < 0) { 309 if (errno != EADDRINUSE) { 310 error_setg_errno(errp, errno, "Failed to bind socket"); 311 goto listen_failed; 312 } 313 } else { 314 if (!listen(slisten, num)) { 315 goto listen_ok; 316 } 317 if (errno != EADDRINUSE) { 318 error_setg_errno(errp, errno, "Failed to listen on socket"); 319 goto listen_failed; 320 } 321 } 322 /* Someone else managed to bind to the same port and beat us 323 * to listen on it! Socket semantics does not allow us to 324 * recover from this situation, so we need to recreate the 325 * socket to allow bind attempts for subsequent ports: 326 */ 327 closesocket(slisten); 328 slisten = -1; 329 } 330 } 331 error_setg_errno(errp, errno, 332 socket_created ? 333 "Failed to find an available port" : 334 "Failed to create a socket"); 335 listen_failed: 336 saved_errno = errno; 337 if (slisten >= 0) { 338 closesocket(slisten); 339 } 340 freeaddrinfo(res); 341 errno = saved_errno; 342 return -1; 343 344 listen_ok: 345 freeaddrinfo(res); 346 return slisten; 347 } 348 349 #ifdef _WIN32 350 #define QEMU_SOCKET_RC_INPROGRESS(rc) \ 351 ((rc) == -EINPROGRESS || (rc) == -EWOULDBLOCK || (rc) == -WSAEALREADY) 352 #else 353 #define QEMU_SOCKET_RC_INPROGRESS(rc) \ 354 ((rc) == -EINPROGRESS) 355 #endif 356 357 static int inet_connect_addr(struct addrinfo *addr, Error **errp); 358 359 static int inet_connect_addr(struct addrinfo *addr, Error **errp) 360 { 361 int sock, rc; 362 363 sock = qemu_socket(addr->ai_family, addr->ai_socktype, addr->ai_protocol); 364 if (sock < 0) { 365 error_setg_errno(errp, errno, "Failed to create socket"); 366 return -1; 367 } 368 socket_set_fast_reuse(sock); 369 370 /* connect to peer */ 371 do { 372 rc = 0; 373 if (connect(sock, addr->ai_addr, addr->ai_addrlen) < 0) { 374 rc = -errno; 375 } 376 } while (rc == -EINTR); 377 378 if (rc < 0) { 379 error_setg_errno(errp, errno, "Failed to connect socket"); 380 closesocket(sock); 381 return -1; 382 } 383 384 return sock; 385 } 386 387 static struct addrinfo *inet_parse_connect_saddr(InetSocketAddress *saddr, 388 Error **errp) 389 { 390 struct addrinfo ai, *res; 391 int rc; 392 Error *err = NULL; 393 static int useV4Mapped = 1; 394 395 memset(&ai, 0, sizeof(ai)); 396 397 ai.ai_flags = AI_CANONNAME | AI_ADDRCONFIG; 398 if (atomic_read(&useV4Mapped)) { 399 ai.ai_flags |= AI_V4MAPPED; 400 } 401 ai.ai_family = inet_ai_family_from_address(saddr, &err); 402 ai.ai_socktype = SOCK_STREAM; 403 404 if (err) { 405 error_propagate(errp, err); 406 return NULL; 407 } 408 409 if (saddr->host == NULL || saddr->port == NULL) { 410 error_setg(errp, "host and/or port not specified"); 411 return NULL; 412 } 413 414 /* lookup */ 415 rc = getaddrinfo(saddr->host, saddr->port, &ai, &res); 416 417 /* At least FreeBSD and OS-X 10.6 declare AI_V4MAPPED but 418 * then don't implement it in their getaddrinfo(). Detect 419 * this and retry without the flag since that's preferrable 420 * to a fatal error 421 */ 422 if (rc == EAI_BADFLAGS && 423 (ai.ai_flags & AI_V4MAPPED)) { 424 atomic_set(&useV4Mapped, 0); 425 ai.ai_flags &= ~AI_V4MAPPED; 426 rc = getaddrinfo(saddr->host, saddr->port, &ai, &res); 427 } 428 if (rc != 0) { 429 error_setg(errp, "address resolution failed for %s:%s: %s", 430 saddr->host, saddr->port, gai_strerror(rc)); 431 return NULL; 432 } 433 return res; 434 } 435 436 /** 437 * Create a socket and connect it to an address. 438 * 439 * @saddr: Inet socket address specification 440 * @errp: set on error 441 * 442 * Returns: -1 on error, file descriptor on success. 443 */ 444 int inet_connect_saddr(InetSocketAddress *saddr, Error **errp) 445 { 446 Error *local_err = NULL; 447 struct addrinfo *res, *e; 448 int sock = -1; 449 450 res = inet_parse_connect_saddr(saddr, errp); 451 if (!res) { 452 return -1; 453 } 454 455 for (e = res; e != NULL; e = e->ai_next) { 456 error_free(local_err); 457 local_err = NULL; 458 sock = inet_connect_addr(e, &local_err); 459 if (sock >= 0) { 460 break; 461 } 462 } 463 464 freeaddrinfo(res); 465 466 if (sock < 0) { 467 error_propagate(errp, local_err); 468 return sock; 469 } 470 471 if (saddr->keep_alive) { 472 int val = 1; 473 int ret = qemu_setsockopt(sock, SOL_SOCKET, SO_KEEPALIVE, 474 &val, sizeof(val)); 475 476 if (ret < 0) { 477 error_setg_errno(errp, errno, "Unable to set KEEPALIVE"); 478 close(sock); 479 return -1; 480 } 481 } 482 483 return sock; 484 } 485 486 static int inet_dgram_saddr(InetSocketAddress *sraddr, 487 InetSocketAddress *sladdr, 488 Error **errp) 489 { 490 struct addrinfo ai, *peer = NULL, *local = NULL; 491 const char *addr; 492 const char *port; 493 int sock = -1, rc; 494 Error *err = NULL; 495 496 /* lookup peer addr */ 497 memset(&ai,0, sizeof(ai)); 498 ai.ai_flags = AI_CANONNAME | AI_V4MAPPED | AI_ADDRCONFIG; 499 ai.ai_family = inet_ai_family_from_address(sraddr, &err); 500 ai.ai_socktype = SOCK_DGRAM; 501 502 if (err) { 503 error_propagate(errp, err); 504 goto err; 505 } 506 507 addr = sraddr->host; 508 port = sraddr->port; 509 if (addr == NULL || strlen(addr) == 0) { 510 addr = "localhost"; 511 } 512 if (port == NULL || strlen(port) == 0) { 513 error_setg(errp, "remote port not specified"); 514 goto err; 515 } 516 517 if ((rc = getaddrinfo(addr, port, &ai, &peer)) != 0) { 518 error_setg(errp, "address resolution failed for %s:%s: %s", addr, port, 519 gai_strerror(rc)); 520 goto err; 521 } 522 523 /* lookup local addr */ 524 memset(&ai,0, sizeof(ai)); 525 ai.ai_flags = AI_PASSIVE; 526 ai.ai_family = peer->ai_family; 527 ai.ai_socktype = SOCK_DGRAM; 528 529 if (sladdr) { 530 addr = sladdr->host; 531 port = sladdr->port; 532 if (addr == NULL || strlen(addr) == 0) { 533 addr = NULL; 534 } 535 if (!port || strlen(port) == 0) { 536 port = "0"; 537 } 538 } else { 539 addr = NULL; 540 port = "0"; 541 } 542 543 if ((rc = getaddrinfo(addr, port, &ai, &local)) != 0) { 544 error_setg(errp, "address resolution failed for %s:%s: %s", addr, port, 545 gai_strerror(rc)); 546 goto err; 547 } 548 549 /* create socket */ 550 sock = qemu_socket(peer->ai_family, peer->ai_socktype, peer->ai_protocol); 551 if (sock < 0) { 552 error_setg_errno(errp, errno, "Failed to create socket"); 553 goto err; 554 } 555 socket_set_fast_reuse(sock); 556 557 /* bind socket */ 558 if (bind(sock, local->ai_addr, local->ai_addrlen) < 0) { 559 error_setg_errno(errp, errno, "Failed to bind socket"); 560 goto err; 561 } 562 563 /* connect to peer */ 564 if (connect(sock,peer->ai_addr,peer->ai_addrlen) < 0) { 565 error_setg_errno(errp, errno, "Failed to connect socket"); 566 goto err; 567 } 568 569 freeaddrinfo(local); 570 freeaddrinfo(peer); 571 return sock; 572 573 err: 574 if (sock != -1) { 575 closesocket(sock); 576 } 577 if (local) { 578 freeaddrinfo(local); 579 } 580 if (peer) { 581 freeaddrinfo(peer); 582 } 583 584 return -1; 585 } 586 587 /* compatibility wrapper */ 588 static int inet_parse_flag(const char *flagname, const char *optstr, bool *val, 589 Error **errp) 590 { 591 char *end; 592 size_t len; 593 594 end = strstr(optstr, ","); 595 if (end) { 596 if (end[1] == ',') { /* Reject 'ipv6=on,,foo' */ 597 error_setg(errp, "error parsing '%s' flag '%s'", flagname, optstr); 598 return -1; 599 } 600 len = end - optstr; 601 } else { 602 len = strlen(optstr); 603 } 604 if (len == 0 || (len == 3 && strncmp(optstr, "=on", len) == 0)) { 605 *val = true; 606 } else if (len == 4 && strncmp(optstr, "=off", len) == 0) { 607 *val = false; 608 } else { 609 error_setg(errp, "error parsing '%s' flag '%s'", flagname, optstr); 610 return -1; 611 } 612 return 0; 613 } 614 615 int inet_parse(InetSocketAddress *addr, const char *str, Error **errp) 616 { 617 const char *optstr, *h; 618 char host[65]; 619 char port[33]; 620 int to; 621 int pos; 622 char *begin; 623 624 memset(addr, 0, sizeof(*addr)); 625 626 /* parse address */ 627 if (str[0] == ':') { 628 /* no host given */ 629 host[0] = '\0'; 630 if (sscanf(str, ":%32[^,]%n", port, &pos) != 1) { 631 error_setg(errp, "error parsing port in address '%s'", str); 632 return -1; 633 } 634 } else if (str[0] == '[') { 635 /* IPv6 addr */ 636 if (sscanf(str, "[%64[^]]]:%32[^,]%n", host, port, &pos) != 2) { 637 error_setg(errp, "error parsing IPv6 address '%s'", str); 638 return -1; 639 } 640 } else { 641 /* hostname or IPv4 addr */ 642 if (sscanf(str, "%64[^:]:%32[^,]%n", host, port, &pos) != 2) { 643 error_setg(errp, "error parsing address '%s'", str); 644 return -1; 645 } 646 } 647 648 addr->host = g_strdup(host); 649 addr->port = g_strdup(port); 650 651 /* parse options */ 652 optstr = str + pos; 653 h = strstr(optstr, ",to="); 654 if (h) { 655 h += 4; 656 if (sscanf(h, "%d%n", &to, &pos) != 1 || 657 (h[pos] != '\0' && h[pos] != ',')) { 658 error_setg(errp, "error parsing to= argument"); 659 return -1; 660 } 661 addr->has_to = true; 662 addr->to = to; 663 } 664 begin = strstr(optstr, ",ipv4"); 665 if (begin) { 666 if (inet_parse_flag("ipv4", begin + 5, &addr->ipv4, errp) < 0) { 667 return -1; 668 } 669 addr->has_ipv4 = true; 670 } 671 begin = strstr(optstr, ",ipv6"); 672 if (begin) { 673 if (inet_parse_flag("ipv6", begin + 5, &addr->ipv6, errp) < 0) { 674 return -1; 675 } 676 addr->has_ipv6 = true; 677 } 678 begin = strstr(optstr, ",keep-alive"); 679 if (begin) { 680 if (inet_parse_flag("keep-alive", begin + strlen(",keep-alive"), 681 &addr->keep_alive, errp) < 0) 682 { 683 return -1; 684 } 685 addr->has_keep_alive = true; 686 } 687 return 0; 688 } 689 690 691 /** 692 * Create a blocking socket and connect it to an address. 693 * 694 * @str: address string 695 * @errp: set in case of an error 696 * 697 * Returns -1 in case of error, file descriptor on success 698 **/ 699 int inet_connect(const char *str, Error **errp) 700 { 701 int sock = -1; 702 InetSocketAddress *addr = g_new(InetSocketAddress, 1); 703 704 if (!inet_parse(addr, str, errp)) { 705 sock = inet_connect_saddr(addr, errp); 706 } 707 qapi_free_InetSocketAddress(addr); 708 return sock; 709 } 710 711 #ifdef CONFIG_AF_VSOCK 712 static bool vsock_parse_vaddr_to_sockaddr(const VsockSocketAddress *vaddr, 713 struct sockaddr_vm *svm, 714 Error **errp) 715 { 716 unsigned long long val; 717 718 memset(svm, 0, sizeof(*svm)); 719 svm->svm_family = AF_VSOCK; 720 721 if (parse_uint_full(vaddr->cid, &val, 10) < 0 || 722 val > UINT32_MAX) { 723 error_setg(errp, "Failed to parse cid '%s'", vaddr->cid); 724 return false; 725 } 726 svm->svm_cid = val; 727 728 if (parse_uint_full(vaddr->port, &val, 10) < 0 || 729 val > UINT32_MAX) { 730 error_setg(errp, "Failed to parse port '%s'", vaddr->port); 731 return false; 732 } 733 svm->svm_port = val; 734 735 return true; 736 } 737 738 static int vsock_connect_addr(const struct sockaddr_vm *svm, Error **errp) 739 { 740 int sock, rc; 741 742 sock = qemu_socket(AF_VSOCK, SOCK_STREAM, 0); 743 if (sock < 0) { 744 error_setg_errno(errp, errno, "Failed to create socket"); 745 return -1; 746 } 747 748 /* connect to peer */ 749 do { 750 rc = 0; 751 if (connect(sock, (const struct sockaddr *)svm, sizeof(*svm)) < 0) { 752 rc = -errno; 753 } 754 } while (rc == -EINTR); 755 756 if (rc < 0) { 757 error_setg_errno(errp, errno, "Failed to connect socket"); 758 closesocket(sock); 759 return -1; 760 } 761 762 return sock; 763 } 764 765 static int vsock_connect_saddr(VsockSocketAddress *vaddr, Error **errp) 766 { 767 struct sockaddr_vm svm; 768 769 if (!vsock_parse_vaddr_to_sockaddr(vaddr, &svm, errp)) { 770 return -1; 771 } 772 773 return vsock_connect_addr(&svm, errp); 774 } 775 776 static int vsock_listen_saddr(VsockSocketAddress *vaddr, 777 int num, 778 Error **errp) 779 { 780 struct sockaddr_vm svm; 781 int slisten; 782 783 if (!vsock_parse_vaddr_to_sockaddr(vaddr, &svm, errp)) { 784 return -1; 785 } 786 787 slisten = qemu_socket(AF_VSOCK, SOCK_STREAM, 0); 788 if (slisten < 0) { 789 error_setg_errno(errp, errno, "Failed to create socket"); 790 return -1; 791 } 792 793 if (bind(slisten, (const struct sockaddr *)&svm, sizeof(svm)) != 0) { 794 error_setg_errno(errp, errno, "Failed to bind socket"); 795 closesocket(slisten); 796 return -1; 797 } 798 799 if (listen(slisten, num) != 0) { 800 error_setg_errno(errp, errno, "Failed to listen on socket"); 801 closesocket(slisten); 802 return -1; 803 } 804 return slisten; 805 } 806 807 static int vsock_parse(VsockSocketAddress *addr, const char *str, 808 Error **errp) 809 { 810 char cid[33]; 811 char port[33]; 812 int n; 813 814 if (sscanf(str, "%32[^:]:%32[^,]%n", cid, port, &n) != 2) { 815 error_setg(errp, "error parsing address '%s'", str); 816 return -1; 817 } 818 if (str[n] != '\0') { 819 error_setg(errp, "trailing characters in address '%s'", str); 820 return -1; 821 } 822 823 addr->cid = g_strdup(cid); 824 addr->port = g_strdup(port); 825 return 0; 826 } 827 #else 828 static void vsock_unsupported(Error **errp) 829 { 830 error_setg(errp, "socket family AF_VSOCK unsupported"); 831 } 832 833 static int vsock_connect_saddr(VsockSocketAddress *vaddr, Error **errp) 834 { 835 vsock_unsupported(errp); 836 return -1; 837 } 838 839 static int vsock_listen_saddr(VsockSocketAddress *vaddr, 840 int num, 841 Error **errp) 842 { 843 vsock_unsupported(errp); 844 return -1; 845 } 846 847 static int vsock_parse(VsockSocketAddress *addr, const char *str, 848 Error **errp) 849 { 850 vsock_unsupported(errp); 851 return -1; 852 } 853 #endif /* CONFIG_AF_VSOCK */ 854 855 #ifndef _WIN32 856 857 static int unix_listen_saddr(UnixSocketAddress *saddr, 858 int num, 859 Error **errp) 860 { 861 struct sockaddr_un un; 862 int sock, fd; 863 char *pathbuf = NULL; 864 const char *path; 865 size_t pathlen; 866 size_t addrlen; 867 868 sock = qemu_socket(PF_UNIX, SOCK_STREAM, 0); 869 if (sock < 0) { 870 error_setg_errno(errp, errno, "Failed to create Unix socket"); 871 return -1; 872 } 873 874 if (saddr->path && saddr->path[0]) { 875 path = saddr->path; 876 } else { 877 const char *tmpdir = getenv("TMPDIR"); 878 tmpdir = tmpdir ? tmpdir : "/tmp"; 879 path = pathbuf = g_strdup_printf("%s/qemu-socket-XXXXXX", tmpdir); 880 } 881 882 pathlen = strlen(path); 883 if (pathlen > sizeof(un.sun_path) || 884 (saddr->abstract && pathlen > (sizeof(un.sun_path) - 1))) { 885 error_setg(errp, "UNIX socket path '%s' is too long", path); 886 error_append_hint(errp, "Path must be less than %zu bytes\n", 887 saddr->abstract ? sizeof(un.sun_path) - 1 : 888 sizeof(un.sun_path)); 889 goto err; 890 } 891 892 if (pathbuf != NULL) { 893 /* 894 * This dummy fd usage silences the mktemp() unsecure warning. 895 * Using mkstemp() doesn't make things more secure here 896 * though. bind() complains about existing files, so we have 897 * to unlink first and thus re-open the race window. The 898 * worst case possible is bind() failing, i.e. a DoS attack. 899 */ 900 fd = mkstemp(pathbuf); 901 if (fd < 0) { 902 error_setg_errno(errp, errno, 903 "Failed to make a temporary socket %s", pathbuf); 904 goto err; 905 } 906 close(fd); 907 } 908 909 if (!saddr->abstract && unlink(path) < 0 && errno != ENOENT) { 910 error_setg_errno(errp, errno, 911 "Failed to unlink socket %s", path); 912 goto err; 913 } 914 915 memset(&un, 0, sizeof(un)); 916 un.sun_family = AF_UNIX; 917 addrlen = sizeof(un); 918 919 if (saddr->abstract) { 920 un.sun_path[0] = '\0'; 921 memcpy(&un.sun_path[1], path, pathlen); 922 if (saddr->tight) { 923 addrlen = offsetof(struct sockaddr_un, sun_path) + 1 + pathlen; 924 } 925 } else { 926 memcpy(un.sun_path, path, pathlen); 927 } 928 929 if (bind(sock, (struct sockaddr *) &un, addrlen) < 0) { 930 error_setg_errno(errp, errno, "Failed to bind socket to %s", path); 931 goto err; 932 } 933 if (listen(sock, num) < 0) { 934 error_setg_errno(errp, errno, "Failed to listen on socket"); 935 goto err; 936 } 937 938 g_free(pathbuf); 939 return sock; 940 941 err: 942 g_free(pathbuf); 943 closesocket(sock); 944 return -1; 945 } 946 947 static int unix_connect_saddr(UnixSocketAddress *saddr, Error **errp) 948 { 949 struct sockaddr_un un; 950 int sock, rc; 951 size_t pathlen; 952 size_t addrlen; 953 954 if (saddr->path == NULL) { 955 error_setg(errp, "unix connect: no path specified"); 956 return -1; 957 } 958 959 sock = qemu_socket(PF_UNIX, SOCK_STREAM, 0); 960 if (sock < 0) { 961 error_setg_errno(errp, errno, "Failed to create socket"); 962 return -1; 963 } 964 965 pathlen = strlen(saddr->path); 966 if (pathlen > sizeof(un.sun_path) || 967 (saddr->abstract && pathlen > (sizeof(un.sun_path) - 1))) { 968 error_setg(errp, "UNIX socket path '%s' is too long", saddr->path); 969 error_append_hint(errp, "Path must be less than %zu bytes\n", 970 saddr->abstract ? sizeof(un.sun_path) - 1 : 971 sizeof(un.sun_path)); 972 goto err; 973 } 974 975 memset(&un, 0, sizeof(un)); 976 un.sun_family = AF_UNIX; 977 addrlen = sizeof(un); 978 979 if (saddr->abstract) { 980 un.sun_path[0] = '\0'; 981 memcpy(&un.sun_path[1], saddr->path, pathlen); 982 if (saddr->tight) { 983 addrlen = offsetof(struct sockaddr_un, sun_path) + 1 + pathlen; 984 } 985 } else { 986 memcpy(un.sun_path, saddr->path, pathlen); 987 } 988 /* connect to peer */ 989 do { 990 rc = 0; 991 if (connect(sock, (struct sockaddr *) &un, addrlen) < 0) { 992 rc = -errno; 993 } 994 } while (rc == -EINTR); 995 996 if (rc < 0) { 997 error_setg_errno(errp, -rc, "Failed to connect socket %s", 998 saddr->path); 999 goto err; 1000 } 1001 1002 return sock; 1003 1004 err: 1005 close(sock); 1006 return -1; 1007 } 1008 1009 #else 1010 1011 static int unix_listen_saddr(UnixSocketAddress *saddr, 1012 int num, 1013 Error **errp) 1014 { 1015 error_setg(errp, "unix sockets are not available on windows"); 1016 errno = ENOTSUP; 1017 return -1; 1018 } 1019 1020 static int unix_connect_saddr(UnixSocketAddress *saddr, Error **errp) 1021 { 1022 error_setg(errp, "unix sockets are not available on windows"); 1023 errno = ENOTSUP; 1024 return -1; 1025 } 1026 #endif 1027 1028 /* compatibility wrapper */ 1029 int unix_listen(const char *str, Error **errp) 1030 { 1031 UnixSocketAddress *saddr; 1032 int sock; 1033 1034 saddr = g_new0(UnixSocketAddress, 1); 1035 saddr->path = g_strdup(str); 1036 sock = unix_listen_saddr(saddr, 1, errp); 1037 qapi_free_UnixSocketAddress(saddr); 1038 return sock; 1039 } 1040 1041 int unix_connect(const char *path, Error **errp) 1042 { 1043 UnixSocketAddress *saddr; 1044 int sock; 1045 1046 saddr = g_new0(UnixSocketAddress, 1); 1047 saddr->path = g_strdup(path); 1048 sock = unix_connect_saddr(saddr, errp); 1049 qapi_free_UnixSocketAddress(saddr); 1050 return sock; 1051 } 1052 1053 1054 SocketAddress *socket_parse(const char *str, Error **errp) 1055 { 1056 SocketAddress *addr; 1057 1058 addr = g_new0(SocketAddress, 1); 1059 if (strstart(str, "unix:", NULL)) { 1060 if (str[5] == '\0') { 1061 error_setg(errp, "invalid Unix socket address"); 1062 goto fail; 1063 } else { 1064 addr->type = SOCKET_ADDRESS_TYPE_UNIX; 1065 addr->u.q_unix.path = g_strdup(str + 5); 1066 } 1067 } else if (strstart(str, "fd:", NULL)) { 1068 if (str[3] == '\0') { 1069 error_setg(errp, "invalid file descriptor address"); 1070 goto fail; 1071 } else { 1072 addr->type = SOCKET_ADDRESS_TYPE_FD; 1073 addr->u.fd.str = g_strdup(str + 3); 1074 } 1075 } else if (strstart(str, "vsock:", NULL)) { 1076 addr->type = SOCKET_ADDRESS_TYPE_VSOCK; 1077 if (vsock_parse(&addr->u.vsock, str + strlen("vsock:"), errp)) { 1078 goto fail; 1079 } 1080 } else { 1081 addr->type = SOCKET_ADDRESS_TYPE_INET; 1082 if (inet_parse(&addr->u.inet, str, errp)) { 1083 goto fail; 1084 } 1085 } 1086 return addr; 1087 1088 fail: 1089 qapi_free_SocketAddress(addr); 1090 return NULL; 1091 } 1092 1093 static int socket_get_fd(const char *fdstr, int num, Error **errp) 1094 { 1095 int fd; 1096 if (num != 1) { 1097 error_setg_errno(errp, EINVAL, "socket_get_fd: too many connections"); 1098 return -1; 1099 } 1100 if (cur_mon) { 1101 fd = monitor_get_fd(cur_mon, fdstr, errp); 1102 if (fd < 0) { 1103 return -1; 1104 } 1105 } else { 1106 if (qemu_strtoi(fdstr, NULL, 10, &fd) < 0) { 1107 error_setg_errno(errp, errno, 1108 "Unable to parse FD number %s", 1109 fdstr); 1110 return -1; 1111 } 1112 } 1113 if (!fd_is_socket(fd)) { 1114 error_setg(errp, "File descriptor '%s' is not a socket", fdstr); 1115 close(fd); 1116 return -1; 1117 } 1118 return fd; 1119 } 1120 1121 int socket_connect(SocketAddress *addr, Error **errp) 1122 { 1123 int fd; 1124 1125 switch (addr->type) { 1126 case SOCKET_ADDRESS_TYPE_INET: 1127 fd = inet_connect_saddr(&addr->u.inet, errp); 1128 break; 1129 1130 case SOCKET_ADDRESS_TYPE_UNIX: 1131 fd = unix_connect_saddr(&addr->u.q_unix, errp); 1132 break; 1133 1134 case SOCKET_ADDRESS_TYPE_FD: 1135 fd = socket_get_fd(addr->u.fd.str, 1, errp); 1136 break; 1137 1138 case SOCKET_ADDRESS_TYPE_VSOCK: 1139 fd = vsock_connect_saddr(&addr->u.vsock, errp); 1140 break; 1141 1142 default: 1143 abort(); 1144 } 1145 return fd; 1146 } 1147 1148 int socket_listen(SocketAddress *addr, int num, Error **errp) 1149 { 1150 int fd; 1151 1152 trace_socket_listen(num); 1153 switch (addr->type) { 1154 case SOCKET_ADDRESS_TYPE_INET: 1155 fd = inet_listen_saddr(&addr->u.inet, 0, num, errp); 1156 break; 1157 1158 case SOCKET_ADDRESS_TYPE_UNIX: 1159 fd = unix_listen_saddr(&addr->u.q_unix, num, errp); 1160 break; 1161 1162 case SOCKET_ADDRESS_TYPE_FD: 1163 fd = socket_get_fd(addr->u.fd.str, num, errp); 1164 break; 1165 1166 case SOCKET_ADDRESS_TYPE_VSOCK: 1167 fd = vsock_listen_saddr(&addr->u.vsock, num, errp); 1168 break; 1169 1170 default: 1171 abort(); 1172 } 1173 return fd; 1174 } 1175 1176 void socket_listen_cleanup(int fd, Error **errp) 1177 { 1178 SocketAddress *addr; 1179 1180 addr = socket_local_address(fd, errp); 1181 if (!addr) { 1182 return; 1183 } 1184 1185 if (addr->type == SOCKET_ADDRESS_TYPE_UNIX 1186 && addr->u.q_unix.path) { 1187 if (unlink(addr->u.q_unix.path) < 0 && errno != ENOENT) { 1188 error_setg_errno(errp, errno, 1189 "Failed to unlink socket %s", 1190 addr->u.q_unix.path); 1191 } 1192 } 1193 1194 qapi_free_SocketAddress(addr); 1195 } 1196 1197 int socket_dgram(SocketAddress *remote, SocketAddress *local, Error **errp) 1198 { 1199 int fd; 1200 1201 /* 1202 * TODO SOCKET_ADDRESS_TYPE_FD when fd is AF_INET or AF_INET6 1203 * (although other address families can do SOCK_DGRAM, too) 1204 */ 1205 switch (remote->type) { 1206 case SOCKET_ADDRESS_TYPE_INET: 1207 fd = inet_dgram_saddr(&remote->u.inet, 1208 local ? &local->u.inet : NULL, errp); 1209 break; 1210 1211 default: 1212 error_setg(errp, "socket type unsupported for datagram"); 1213 fd = -1; 1214 } 1215 return fd; 1216 } 1217 1218 1219 static SocketAddress * 1220 socket_sockaddr_to_address_inet(struct sockaddr_storage *sa, 1221 socklen_t salen, 1222 Error **errp) 1223 { 1224 char host[NI_MAXHOST]; 1225 char serv[NI_MAXSERV]; 1226 SocketAddress *addr; 1227 InetSocketAddress *inet; 1228 int ret; 1229 1230 ret = getnameinfo((struct sockaddr *)sa, salen, 1231 host, sizeof(host), 1232 serv, sizeof(serv), 1233 NI_NUMERICHOST | NI_NUMERICSERV); 1234 if (ret != 0) { 1235 error_setg(errp, "Cannot format numeric socket address: %s", 1236 gai_strerror(ret)); 1237 return NULL; 1238 } 1239 1240 addr = g_new0(SocketAddress, 1); 1241 addr->type = SOCKET_ADDRESS_TYPE_INET; 1242 inet = &addr->u.inet; 1243 inet->host = g_strdup(host); 1244 inet->port = g_strdup(serv); 1245 if (sa->ss_family == AF_INET) { 1246 inet->has_ipv4 = inet->ipv4 = true; 1247 } else { 1248 inet->has_ipv6 = inet->ipv6 = true; 1249 } 1250 1251 return addr; 1252 } 1253 1254 1255 #ifndef WIN32 1256 static SocketAddress * 1257 socket_sockaddr_to_address_unix(struct sockaddr_storage *sa, 1258 socklen_t salen, 1259 Error **errp) 1260 { 1261 SocketAddress *addr; 1262 struct sockaddr_un *su = (struct sockaddr_un *)sa; 1263 1264 addr = g_new0(SocketAddress, 1); 1265 addr->type = SOCKET_ADDRESS_TYPE_UNIX; 1266 if (su->sun_path[0]) { 1267 addr->u.q_unix.path = g_strndup(su->sun_path, sizeof(su->sun_path)); 1268 } 1269 1270 return addr; 1271 } 1272 #endif /* WIN32 */ 1273 1274 #ifdef CONFIG_AF_VSOCK 1275 static SocketAddress * 1276 socket_sockaddr_to_address_vsock(struct sockaddr_storage *sa, 1277 socklen_t salen, 1278 Error **errp) 1279 { 1280 SocketAddress *addr; 1281 VsockSocketAddress *vaddr; 1282 struct sockaddr_vm *svm = (struct sockaddr_vm *)sa; 1283 1284 addr = g_new0(SocketAddress, 1); 1285 addr->type = SOCKET_ADDRESS_TYPE_VSOCK; 1286 vaddr = &addr->u.vsock; 1287 vaddr->cid = g_strdup_printf("%u", svm->svm_cid); 1288 vaddr->port = g_strdup_printf("%u", svm->svm_port); 1289 1290 return addr; 1291 } 1292 #endif /* CONFIG_AF_VSOCK */ 1293 1294 SocketAddress * 1295 socket_sockaddr_to_address(struct sockaddr_storage *sa, 1296 socklen_t salen, 1297 Error **errp) 1298 { 1299 switch (sa->ss_family) { 1300 case AF_INET: 1301 case AF_INET6: 1302 return socket_sockaddr_to_address_inet(sa, salen, errp); 1303 1304 #ifndef WIN32 1305 case AF_UNIX: 1306 return socket_sockaddr_to_address_unix(sa, salen, errp); 1307 #endif /* WIN32 */ 1308 1309 #ifdef CONFIG_AF_VSOCK 1310 case AF_VSOCK: 1311 return socket_sockaddr_to_address_vsock(sa, salen, errp); 1312 #endif 1313 1314 default: 1315 error_setg(errp, "socket family %d unsupported", 1316 sa->ss_family); 1317 return NULL; 1318 } 1319 return 0; 1320 } 1321 1322 1323 SocketAddress *socket_local_address(int fd, Error **errp) 1324 { 1325 struct sockaddr_storage ss; 1326 socklen_t sslen = sizeof(ss); 1327 1328 if (getsockname(fd, (struct sockaddr *)&ss, &sslen) < 0) { 1329 error_setg_errno(errp, errno, "%s", 1330 "Unable to query local socket address"); 1331 return NULL; 1332 } 1333 1334 return socket_sockaddr_to_address(&ss, sslen, errp); 1335 } 1336 1337 1338 SocketAddress *socket_remote_address(int fd, Error **errp) 1339 { 1340 struct sockaddr_storage ss; 1341 socklen_t sslen = sizeof(ss); 1342 1343 if (getpeername(fd, (struct sockaddr *)&ss, &sslen) < 0) { 1344 error_setg_errno(errp, errno, "%s", 1345 "Unable to query remote socket address"); 1346 return NULL; 1347 } 1348 1349 return socket_sockaddr_to_address(&ss, sslen, errp); 1350 } 1351 1352 1353 SocketAddress *socket_address_flatten(SocketAddressLegacy *addr_legacy) 1354 { 1355 SocketAddress *addr; 1356 1357 if (!addr_legacy) { 1358 return NULL; 1359 } 1360 1361 addr = g_new(SocketAddress, 1); 1362 1363 switch (addr_legacy->type) { 1364 case SOCKET_ADDRESS_LEGACY_KIND_INET: 1365 addr->type = SOCKET_ADDRESS_TYPE_INET; 1366 QAPI_CLONE_MEMBERS(InetSocketAddress, &addr->u.inet, 1367 addr_legacy->u.inet.data); 1368 break; 1369 case SOCKET_ADDRESS_LEGACY_KIND_UNIX: 1370 addr->type = SOCKET_ADDRESS_TYPE_UNIX; 1371 QAPI_CLONE_MEMBERS(UnixSocketAddress, &addr->u.q_unix, 1372 addr_legacy->u.q_unix.data); 1373 break; 1374 case SOCKET_ADDRESS_LEGACY_KIND_VSOCK: 1375 addr->type = SOCKET_ADDRESS_TYPE_VSOCK; 1376 QAPI_CLONE_MEMBERS(VsockSocketAddress, &addr->u.vsock, 1377 addr_legacy->u.vsock.data); 1378 break; 1379 case SOCKET_ADDRESS_LEGACY_KIND_FD: 1380 addr->type = SOCKET_ADDRESS_TYPE_FD; 1381 QAPI_CLONE_MEMBERS(String, &addr->u.fd, addr_legacy->u.fd.data); 1382 break; 1383 default: 1384 abort(); 1385 } 1386 1387 return addr; 1388 } 1389