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 int sock = -1; 769 770 if (!vsock_parse_vaddr_to_sockaddr(vaddr, &svm, errp)) { 771 return -1; 772 } 773 774 sock = vsock_connect_addr(&svm, errp); 775 776 return sock; 777 } 778 779 static int vsock_listen_saddr(VsockSocketAddress *vaddr, 780 int num, 781 Error **errp) 782 { 783 struct sockaddr_vm svm; 784 int slisten; 785 786 if (!vsock_parse_vaddr_to_sockaddr(vaddr, &svm, errp)) { 787 return -1; 788 } 789 790 slisten = qemu_socket(AF_VSOCK, SOCK_STREAM, 0); 791 if (slisten < 0) { 792 error_setg_errno(errp, errno, "Failed to create socket"); 793 return -1; 794 } 795 796 if (bind(slisten, (const struct sockaddr *)&svm, sizeof(svm)) != 0) { 797 error_setg_errno(errp, errno, "Failed to bind socket"); 798 closesocket(slisten); 799 return -1; 800 } 801 802 if (listen(slisten, num) != 0) { 803 error_setg_errno(errp, errno, "Failed to listen on socket"); 804 closesocket(slisten); 805 return -1; 806 } 807 return slisten; 808 } 809 810 static int vsock_parse(VsockSocketAddress *addr, const char *str, 811 Error **errp) 812 { 813 char cid[33]; 814 char port[33]; 815 int n; 816 817 if (sscanf(str, "%32[^:]:%32[^,]%n", cid, port, &n) != 2) { 818 error_setg(errp, "error parsing address '%s'", str); 819 return -1; 820 } 821 if (str[n] != '\0') { 822 error_setg(errp, "trailing characters in address '%s'", str); 823 return -1; 824 } 825 826 addr->cid = g_strdup(cid); 827 addr->port = g_strdup(port); 828 return 0; 829 } 830 #else 831 static void vsock_unsupported(Error **errp) 832 { 833 error_setg(errp, "socket family AF_VSOCK unsupported"); 834 } 835 836 static int vsock_connect_saddr(VsockSocketAddress *vaddr, Error **errp) 837 { 838 vsock_unsupported(errp); 839 return -1; 840 } 841 842 static int vsock_listen_saddr(VsockSocketAddress *vaddr, 843 int num, 844 Error **errp) 845 { 846 vsock_unsupported(errp); 847 return -1; 848 } 849 850 static int vsock_parse(VsockSocketAddress *addr, const char *str, 851 Error **errp) 852 { 853 vsock_unsupported(errp); 854 return -1; 855 } 856 #endif /* CONFIG_AF_VSOCK */ 857 858 #ifndef _WIN32 859 860 static int unix_listen_saddr(UnixSocketAddress *saddr, 861 int num, 862 Error **errp) 863 { 864 struct sockaddr_un un; 865 int sock, fd; 866 char *pathbuf = NULL; 867 const char *path; 868 size_t pathlen; 869 870 sock = qemu_socket(PF_UNIX, SOCK_STREAM, 0); 871 if (sock < 0) { 872 error_setg_errno(errp, errno, "Failed to create Unix socket"); 873 return -1; 874 } 875 876 if (saddr->path && saddr->path[0]) { 877 path = saddr->path; 878 } else { 879 const char *tmpdir = getenv("TMPDIR"); 880 tmpdir = tmpdir ? tmpdir : "/tmp"; 881 path = pathbuf = g_strdup_printf("%s/qemu-socket-XXXXXX", tmpdir); 882 } 883 884 pathlen = strlen(path); 885 if (pathlen > sizeof(un.sun_path)) { 886 error_setg(errp, "UNIX socket path '%s' is too long", path); 887 error_append_hint(errp, "Path must be less than %zu bytes\n", 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 (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 memcpy(un.sun_path, path, pathlen); 918 919 if (bind(sock, (struct sockaddr*) &un, sizeof(un)) < 0) { 920 error_setg_errno(errp, errno, "Failed to bind socket to %s", path); 921 goto err; 922 } 923 if (listen(sock, num) < 0) { 924 error_setg_errno(errp, errno, "Failed to listen on socket"); 925 goto err; 926 } 927 928 g_free(pathbuf); 929 return sock; 930 931 err: 932 g_free(pathbuf); 933 closesocket(sock); 934 return -1; 935 } 936 937 static int unix_connect_saddr(UnixSocketAddress *saddr, Error **errp) 938 { 939 struct sockaddr_un un; 940 int sock, rc; 941 size_t pathlen; 942 943 if (saddr->path == NULL) { 944 error_setg(errp, "unix connect: no path specified"); 945 return -1; 946 } 947 948 sock = qemu_socket(PF_UNIX, SOCK_STREAM, 0); 949 if (sock < 0) { 950 error_setg_errno(errp, errno, "Failed to create socket"); 951 return -1; 952 } 953 954 pathlen = strlen(saddr->path); 955 if (pathlen > sizeof(un.sun_path)) { 956 error_setg(errp, "UNIX socket path '%s' is too long", saddr->path); 957 error_append_hint(errp, "Path must be less than %zu bytes\n", 958 sizeof(un.sun_path)); 959 goto err; 960 } 961 962 memset(&un, 0, sizeof(un)); 963 un.sun_family = AF_UNIX; 964 memcpy(un.sun_path, saddr->path, pathlen); 965 966 /* connect to peer */ 967 do { 968 rc = 0; 969 if (connect(sock, (struct sockaddr *) &un, sizeof(un)) < 0) { 970 rc = -errno; 971 } 972 } while (rc == -EINTR); 973 974 if (rc < 0) { 975 error_setg_errno(errp, -rc, "Failed to connect socket %s", 976 saddr->path); 977 goto err; 978 } 979 980 return sock; 981 982 err: 983 close(sock); 984 return -1; 985 } 986 987 #else 988 989 static int unix_listen_saddr(UnixSocketAddress *saddr, 990 int num, 991 Error **errp) 992 { 993 error_setg(errp, "unix sockets are not available on windows"); 994 errno = ENOTSUP; 995 return -1; 996 } 997 998 static int unix_connect_saddr(UnixSocketAddress *saddr, Error **errp) 999 { 1000 error_setg(errp, "unix sockets are not available on windows"); 1001 errno = ENOTSUP; 1002 return -1; 1003 } 1004 #endif 1005 1006 /* compatibility wrapper */ 1007 int unix_listen(const char *str, Error **errp) 1008 { 1009 UnixSocketAddress *saddr; 1010 int sock; 1011 1012 saddr = g_new0(UnixSocketAddress, 1); 1013 saddr->path = g_strdup(str); 1014 sock = unix_listen_saddr(saddr, 1, errp); 1015 qapi_free_UnixSocketAddress(saddr); 1016 return sock; 1017 } 1018 1019 int unix_connect(const char *path, Error **errp) 1020 { 1021 UnixSocketAddress *saddr; 1022 int sock; 1023 1024 saddr = g_new0(UnixSocketAddress, 1); 1025 saddr->path = g_strdup(path); 1026 sock = unix_connect_saddr(saddr, errp); 1027 qapi_free_UnixSocketAddress(saddr); 1028 return sock; 1029 } 1030 1031 1032 SocketAddress *socket_parse(const char *str, Error **errp) 1033 { 1034 SocketAddress *addr; 1035 1036 addr = g_new0(SocketAddress, 1); 1037 if (strstart(str, "unix:", NULL)) { 1038 if (str[5] == '\0') { 1039 error_setg(errp, "invalid Unix socket address"); 1040 goto fail; 1041 } else { 1042 addr->type = SOCKET_ADDRESS_TYPE_UNIX; 1043 addr->u.q_unix.path = g_strdup(str + 5); 1044 } 1045 } else if (strstart(str, "fd:", NULL)) { 1046 if (str[3] == '\0') { 1047 error_setg(errp, "invalid file descriptor address"); 1048 goto fail; 1049 } else { 1050 addr->type = SOCKET_ADDRESS_TYPE_FD; 1051 addr->u.fd.str = g_strdup(str + 3); 1052 } 1053 } else if (strstart(str, "vsock:", NULL)) { 1054 addr->type = SOCKET_ADDRESS_TYPE_VSOCK; 1055 if (vsock_parse(&addr->u.vsock, str + strlen("vsock:"), errp)) { 1056 goto fail; 1057 } 1058 } else { 1059 addr->type = SOCKET_ADDRESS_TYPE_INET; 1060 if (inet_parse(&addr->u.inet, str, errp)) { 1061 goto fail; 1062 } 1063 } 1064 return addr; 1065 1066 fail: 1067 qapi_free_SocketAddress(addr); 1068 return NULL; 1069 } 1070 1071 static int socket_get_fd(const char *fdstr, int num, Error **errp) 1072 { 1073 int fd; 1074 if (num != 1) { 1075 error_setg_errno(errp, EINVAL, "socket_get_fd: too many connections"); 1076 return -1; 1077 } 1078 if (cur_mon) { 1079 fd = monitor_get_fd(cur_mon, fdstr, errp); 1080 if (fd < 0) { 1081 return -1; 1082 } 1083 } else { 1084 if (qemu_strtoi(fdstr, NULL, 10, &fd) < 0) { 1085 error_setg_errno(errp, errno, 1086 "Unable to parse FD number %s", 1087 fdstr); 1088 return -1; 1089 } 1090 } 1091 if (!fd_is_socket(fd)) { 1092 error_setg(errp, "File descriptor '%s' is not a socket", fdstr); 1093 close(fd); 1094 return -1; 1095 } 1096 return fd; 1097 } 1098 1099 int socket_connect(SocketAddress *addr, Error **errp) 1100 { 1101 int fd; 1102 1103 switch (addr->type) { 1104 case SOCKET_ADDRESS_TYPE_INET: 1105 fd = inet_connect_saddr(&addr->u.inet, errp); 1106 break; 1107 1108 case SOCKET_ADDRESS_TYPE_UNIX: 1109 fd = unix_connect_saddr(&addr->u.q_unix, errp); 1110 break; 1111 1112 case SOCKET_ADDRESS_TYPE_FD: 1113 fd = socket_get_fd(addr->u.fd.str, 1, errp); 1114 break; 1115 1116 case SOCKET_ADDRESS_TYPE_VSOCK: 1117 fd = vsock_connect_saddr(&addr->u.vsock, errp); 1118 break; 1119 1120 default: 1121 abort(); 1122 } 1123 return fd; 1124 } 1125 1126 int socket_listen(SocketAddress *addr, int num, Error **errp) 1127 { 1128 int fd; 1129 1130 trace_socket_listen(num); 1131 switch (addr->type) { 1132 case SOCKET_ADDRESS_TYPE_INET: 1133 fd = inet_listen_saddr(&addr->u.inet, 0, num, errp); 1134 break; 1135 1136 case SOCKET_ADDRESS_TYPE_UNIX: 1137 fd = unix_listen_saddr(&addr->u.q_unix, num, errp); 1138 break; 1139 1140 case SOCKET_ADDRESS_TYPE_FD: 1141 fd = socket_get_fd(addr->u.fd.str, num, errp); 1142 break; 1143 1144 case SOCKET_ADDRESS_TYPE_VSOCK: 1145 fd = vsock_listen_saddr(&addr->u.vsock, num, errp); 1146 break; 1147 1148 default: 1149 abort(); 1150 } 1151 return fd; 1152 } 1153 1154 void socket_listen_cleanup(int fd, Error **errp) 1155 { 1156 SocketAddress *addr; 1157 1158 addr = socket_local_address(fd, errp); 1159 if (!addr) { 1160 return; 1161 } 1162 1163 if (addr->type == SOCKET_ADDRESS_TYPE_UNIX 1164 && addr->u.q_unix.path) { 1165 if (unlink(addr->u.q_unix.path) < 0 && errno != ENOENT) { 1166 error_setg_errno(errp, errno, 1167 "Failed to unlink socket %s", 1168 addr->u.q_unix.path); 1169 } 1170 } 1171 1172 qapi_free_SocketAddress(addr); 1173 } 1174 1175 int socket_dgram(SocketAddress *remote, SocketAddress *local, Error **errp) 1176 { 1177 int fd; 1178 1179 /* 1180 * TODO SOCKET_ADDRESS_TYPE_FD when fd is AF_INET or AF_INET6 1181 * (although other address families can do SOCK_DGRAM, too) 1182 */ 1183 switch (remote->type) { 1184 case SOCKET_ADDRESS_TYPE_INET: 1185 fd = inet_dgram_saddr(&remote->u.inet, 1186 local ? &local->u.inet : NULL, errp); 1187 break; 1188 1189 default: 1190 error_setg(errp, "socket type unsupported for datagram"); 1191 fd = -1; 1192 } 1193 return fd; 1194 } 1195 1196 1197 static SocketAddress * 1198 socket_sockaddr_to_address_inet(struct sockaddr_storage *sa, 1199 socklen_t salen, 1200 Error **errp) 1201 { 1202 char host[NI_MAXHOST]; 1203 char serv[NI_MAXSERV]; 1204 SocketAddress *addr; 1205 InetSocketAddress *inet; 1206 int ret; 1207 1208 ret = getnameinfo((struct sockaddr *)sa, salen, 1209 host, sizeof(host), 1210 serv, sizeof(serv), 1211 NI_NUMERICHOST | NI_NUMERICSERV); 1212 if (ret != 0) { 1213 error_setg(errp, "Cannot format numeric socket address: %s", 1214 gai_strerror(ret)); 1215 return NULL; 1216 } 1217 1218 addr = g_new0(SocketAddress, 1); 1219 addr->type = SOCKET_ADDRESS_TYPE_INET; 1220 inet = &addr->u.inet; 1221 inet->host = g_strdup(host); 1222 inet->port = g_strdup(serv); 1223 if (sa->ss_family == AF_INET) { 1224 inet->has_ipv4 = inet->ipv4 = true; 1225 } else { 1226 inet->has_ipv6 = inet->ipv6 = true; 1227 } 1228 1229 return addr; 1230 } 1231 1232 1233 #ifndef WIN32 1234 static SocketAddress * 1235 socket_sockaddr_to_address_unix(struct sockaddr_storage *sa, 1236 socklen_t salen, 1237 Error **errp) 1238 { 1239 SocketAddress *addr; 1240 struct sockaddr_un *su = (struct sockaddr_un *)sa; 1241 1242 addr = g_new0(SocketAddress, 1); 1243 addr->type = SOCKET_ADDRESS_TYPE_UNIX; 1244 if (su->sun_path[0]) { 1245 addr->u.q_unix.path = g_strndup(su->sun_path, sizeof(su->sun_path)); 1246 } 1247 1248 return addr; 1249 } 1250 #endif /* WIN32 */ 1251 1252 #ifdef CONFIG_AF_VSOCK 1253 static SocketAddress * 1254 socket_sockaddr_to_address_vsock(struct sockaddr_storage *sa, 1255 socklen_t salen, 1256 Error **errp) 1257 { 1258 SocketAddress *addr; 1259 VsockSocketAddress *vaddr; 1260 struct sockaddr_vm *svm = (struct sockaddr_vm *)sa; 1261 1262 addr = g_new0(SocketAddress, 1); 1263 addr->type = SOCKET_ADDRESS_TYPE_VSOCK; 1264 vaddr = &addr->u.vsock; 1265 vaddr->cid = g_strdup_printf("%u", svm->svm_cid); 1266 vaddr->port = g_strdup_printf("%u", svm->svm_port); 1267 1268 return addr; 1269 } 1270 #endif /* CONFIG_AF_VSOCK */ 1271 1272 SocketAddress * 1273 socket_sockaddr_to_address(struct sockaddr_storage *sa, 1274 socklen_t salen, 1275 Error **errp) 1276 { 1277 switch (sa->ss_family) { 1278 case AF_INET: 1279 case AF_INET6: 1280 return socket_sockaddr_to_address_inet(sa, salen, errp); 1281 1282 #ifndef WIN32 1283 case AF_UNIX: 1284 return socket_sockaddr_to_address_unix(sa, salen, errp); 1285 #endif /* WIN32 */ 1286 1287 #ifdef CONFIG_AF_VSOCK 1288 case AF_VSOCK: 1289 return socket_sockaddr_to_address_vsock(sa, salen, errp); 1290 #endif 1291 1292 default: 1293 error_setg(errp, "socket family %d unsupported", 1294 sa->ss_family); 1295 return NULL; 1296 } 1297 return 0; 1298 } 1299 1300 1301 SocketAddress *socket_local_address(int fd, Error **errp) 1302 { 1303 struct sockaddr_storage ss; 1304 socklen_t sslen = sizeof(ss); 1305 1306 if (getsockname(fd, (struct sockaddr *)&ss, &sslen) < 0) { 1307 error_setg_errno(errp, errno, "%s", 1308 "Unable to query local socket address"); 1309 return NULL; 1310 } 1311 1312 return socket_sockaddr_to_address(&ss, sslen, errp); 1313 } 1314 1315 1316 SocketAddress *socket_remote_address(int fd, Error **errp) 1317 { 1318 struct sockaddr_storage ss; 1319 socklen_t sslen = sizeof(ss); 1320 1321 if (getpeername(fd, (struct sockaddr *)&ss, &sslen) < 0) { 1322 error_setg_errno(errp, errno, "%s", 1323 "Unable to query remote socket address"); 1324 return NULL; 1325 } 1326 1327 return socket_sockaddr_to_address(&ss, sslen, errp); 1328 } 1329 1330 1331 SocketAddress *socket_address_flatten(SocketAddressLegacy *addr_legacy) 1332 { 1333 SocketAddress *addr; 1334 1335 if (!addr_legacy) { 1336 return NULL; 1337 } 1338 1339 addr = g_new(SocketAddress, 1); 1340 1341 switch (addr_legacy->type) { 1342 case SOCKET_ADDRESS_LEGACY_KIND_INET: 1343 addr->type = SOCKET_ADDRESS_TYPE_INET; 1344 QAPI_CLONE_MEMBERS(InetSocketAddress, &addr->u.inet, 1345 addr_legacy->u.inet.data); 1346 break; 1347 case SOCKET_ADDRESS_LEGACY_KIND_UNIX: 1348 addr->type = SOCKET_ADDRESS_TYPE_UNIX; 1349 QAPI_CLONE_MEMBERS(UnixSocketAddress, &addr->u.q_unix, 1350 addr_legacy->u.q_unix.data); 1351 break; 1352 case SOCKET_ADDRESS_LEGACY_KIND_VSOCK: 1353 addr->type = SOCKET_ADDRESS_TYPE_VSOCK; 1354 QAPI_CLONE_MEMBERS(VsockSocketAddress, &addr->u.vsock, 1355 addr_legacy->u.vsock.data); 1356 break; 1357 case SOCKET_ADDRESS_LEGACY_KIND_FD: 1358 addr->type = SOCKET_ADDRESS_TYPE_FD; 1359 QAPI_CLONE_MEMBERS(String, &addr->u.fd, addr_legacy->u.fd.data); 1360 break; 1361 default: 1362 abort(); 1363 } 1364 1365 return addr; 1366 } 1367