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(const InetSocketAddress *saddr, 358 struct addrinfo *addr, Error **errp) 359 { 360 int sock, rc; 361 362 sock = qemu_socket(addr->ai_family, addr->ai_socktype, addr->ai_protocol); 363 if (sock < 0) { 364 error_setg_errno(errp, errno, "Failed to create socket family %d", 365 addr->ai_family); 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 to '%s:%s'", 380 saddr->host, saddr->port); 381 closesocket(sock); 382 return -1; 383 } 384 385 return sock; 386 } 387 388 static struct addrinfo *inet_parse_connect_saddr(InetSocketAddress *saddr, 389 Error **errp) 390 { 391 struct addrinfo ai, *res; 392 int rc; 393 Error *err = NULL; 394 static int useV4Mapped = 1; 395 396 memset(&ai, 0, sizeof(ai)); 397 398 ai.ai_flags = AI_CANONNAME | AI_ADDRCONFIG; 399 if (qatomic_read(&useV4Mapped)) { 400 ai.ai_flags |= AI_V4MAPPED; 401 } 402 ai.ai_family = inet_ai_family_from_address(saddr, &err); 403 ai.ai_socktype = SOCK_STREAM; 404 405 if (err) { 406 error_propagate(errp, err); 407 return NULL; 408 } 409 410 if (saddr->host == NULL || saddr->port == NULL) { 411 error_setg(errp, "host and/or port not specified"); 412 return NULL; 413 } 414 415 /* lookup */ 416 rc = getaddrinfo(saddr->host, saddr->port, &ai, &res); 417 418 /* At least FreeBSD and OS-X 10.6 declare AI_V4MAPPED but 419 * then don't implement it in their getaddrinfo(). Detect 420 * this and retry without the flag since that's preferable 421 * to a fatal error 422 */ 423 if (rc == EAI_BADFLAGS && 424 (ai.ai_flags & AI_V4MAPPED)) { 425 qatomic_set(&useV4Mapped, 0); 426 ai.ai_flags &= ~AI_V4MAPPED; 427 rc = getaddrinfo(saddr->host, saddr->port, &ai, &res); 428 } 429 if (rc != 0) { 430 error_setg(errp, "address resolution failed for %s:%s: %s", 431 saddr->host, saddr->port, gai_strerror(rc)); 432 return NULL; 433 } 434 return res; 435 } 436 437 /** 438 * Create a socket and connect it to an address. 439 * 440 * @saddr: Inet socket address specification 441 * @errp: set on error 442 * 443 * Returns: -1 on error, file descriptor on success. 444 */ 445 int inet_connect_saddr(InetSocketAddress *saddr, Error **errp) 446 { 447 Error *local_err = NULL; 448 struct addrinfo *res, *e; 449 int sock = -1; 450 451 res = inet_parse_connect_saddr(saddr, errp); 452 if (!res) { 453 return -1; 454 } 455 456 for (e = res; e != NULL; e = e->ai_next) { 457 error_free(local_err); 458 local_err = NULL; 459 sock = inet_connect_addr(saddr, e, &local_err); 460 if (sock >= 0) { 461 break; 462 } 463 } 464 465 freeaddrinfo(res); 466 467 if (sock < 0) { 468 error_propagate(errp, local_err); 469 return sock; 470 } 471 472 if (saddr->keep_alive) { 473 int val = 1; 474 int ret = qemu_setsockopt(sock, SOL_SOCKET, SO_KEEPALIVE, 475 &val, sizeof(val)); 476 477 if (ret < 0) { 478 error_setg_errno(errp, errno, "Unable to set KEEPALIVE"); 479 close(sock); 480 return -1; 481 } 482 } 483 484 return sock; 485 } 486 487 static int inet_dgram_saddr(InetSocketAddress *sraddr, 488 InetSocketAddress *sladdr, 489 Error **errp) 490 { 491 struct addrinfo ai, *peer = NULL, *local = NULL; 492 const char *addr; 493 const char *port; 494 int sock = -1, rc; 495 Error *err = NULL; 496 497 /* lookup peer addr */ 498 memset(&ai,0, sizeof(ai)); 499 ai.ai_flags = AI_CANONNAME | AI_V4MAPPED | AI_ADDRCONFIG; 500 ai.ai_family = inet_ai_family_from_address(sraddr, &err); 501 ai.ai_socktype = SOCK_DGRAM; 502 503 if (err) { 504 error_propagate(errp, err); 505 goto err; 506 } 507 508 addr = sraddr->host; 509 port = sraddr->port; 510 if (addr == NULL || strlen(addr) == 0) { 511 addr = "localhost"; 512 } 513 if (port == NULL || strlen(port) == 0) { 514 error_setg(errp, "remote port not specified"); 515 goto err; 516 } 517 518 if ((rc = getaddrinfo(addr, port, &ai, &peer)) != 0) { 519 error_setg(errp, "address resolution failed for %s:%s: %s", addr, port, 520 gai_strerror(rc)); 521 goto err; 522 } 523 524 /* lookup local addr */ 525 memset(&ai,0, sizeof(ai)); 526 ai.ai_flags = AI_PASSIVE; 527 ai.ai_family = peer->ai_family; 528 ai.ai_socktype = SOCK_DGRAM; 529 530 if (sladdr) { 531 addr = sladdr->host; 532 port = sladdr->port; 533 if (addr == NULL || strlen(addr) == 0) { 534 addr = NULL; 535 } 536 if (!port || strlen(port) == 0) { 537 port = "0"; 538 } 539 } else { 540 addr = NULL; 541 port = "0"; 542 } 543 544 if ((rc = getaddrinfo(addr, port, &ai, &local)) != 0) { 545 error_setg(errp, "address resolution failed for %s:%s: %s", addr, port, 546 gai_strerror(rc)); 547 goto err; 548 } 549 550 /* create socket */ 551 sock = qemu_socket(peer->ai_family, peer->ai_socktype, peer->ai_protocol); 552 if (sock < 0) { 553 error_setg_errno(errp, errno, "Failed to create socket family %d", 554 peer->ai_family); 555 goto err; 556 } 557 socket_set_fast_reuse(sock); 558 559 /* bind socket */ 560 if (bind(sock, local->ai_addr, local->ai_addrlen) < 0) { 561 error_setg_errno(errp, errno, "Failed to bind socket"); 562 goto err; 563 } 564 565 /* connect to peer */ 566 if (connect(sock,peer->ai_addr,peer->ai_addrlen) < 0) { 567 error_setg_errno(errp, errno, "Failed to connect to '%s:%s'", 568 addr, port); 569 goto err; 570 } 571 572 freeaddrinfo(local); 573 freeaddrinfo(peer); 574 return sock; 575 576 err: 577 if (sock != -1) { 578 closesocket(sock); 579 } 580 if (local) { 581 freeaddrinfo(local); 582 } 583 if (peer) { 584 freeaddrinfo(peer); 585 } 586 587 return -1; 588 } 589 590 /* compatibility wrapper */ 591 static int inet_parse_flag(const char *flagname, const char *optstr, bool *val, 592 Error **errp) 593 { 594 char *end; 595 size_t len; 596 597 end = strstr(optstr, ","); 598 if (end) { 599 if (end[1] == ',') { /* Reject 'ipv6=on,,foo' */ 600 error_setg(errp, "error parsing '%s' flag '%s'", flagname, optstr); 601 return -1; 602 } 603 len = end - optstr; 604 } else { 605 len = strlen(optstr); 606 } 607 if (len == 0 || (len == 3 && strncmp(optstr, "=on", len) == 0)) { 608 *val = true; 609 } else if (len == 4 && strncmp(optstr, "=off", len) == 0) { 610 *val = false; 611 } else { 612 error_setg(errp, "error parsing '%s' flag '%s'", flagname, optstr); 613 return -1; 614 } 615 return 0; 616 } 617 618 int inet_parse(InetSocketAddress *addr, const char *str, Error **errp) 619 { 620 const char *optstr, *h; 621 char host[65]; 622 char port[33]; 623 int to; 624 int pos; 625 char *begin; 626 627 memset(addr, 0, sizeof(*addr)); 628 629 /* parse address */ 630 if (str[0] == ':') { 631 /* no host given */ 632 host[0] = '\0'; 633 if (sscanf(str, ":%32[^,]%n", port, &pos) != 1) { 634 error_setg(errp, "error parsing port in address '%s'", str); 635 return -1; 636 } 637 } else if (str[0] == '[') { 638 /* IPv6 addr */ 639 if (sscanf(str, "[%64[^]]]:%32[^,]%n", host, port, &pos) != 2) { 640 error_setg(errp, "error parsing IPv6 address '%s'", str); 641 return -1; 642 } 643 } else { 644 /* hostname or IPv4 addr */ 645 if (sscanf(str, "%64[^:]:%32[^,]%n", host, port, &pos) != 2) { 646 error_setg(errp, "error parsing address '%s'", str); 647 return -1; 648 } 649 } 650 651 addr->host = g_strdup(host); 652 addr->port = g_strdup(port); 653 654 /* parse options */ 655 optstr = str + pos; 656 h = strstr(optstr, ",to="); 657 if (h) { 658 h += 4; 659 if (sscanf(h, "%d%n", &to, &pos) != 1 || 660 (h[pos] != '\0' && h[pos] != ',')) { 661 error_setg(errp, "error parsing to= argument"); 662 return -1; 663 } 664 addr->has_to = true; 665 addr->to = to; 666 } 667 begin = strstr(optstr, ",ipv4"); 668 if (begin) { 669 if (inet_parse_flag("ipv4", begin + 5, &addr->ipv4, errp) < 0) { 670 return -1; 671 } 672 addr->has_ipv4 = true; 673 } 674 begin = strstr(optstr, ",ipv6"); 675 if (begin) { 676 if (inet_parse_flag("ipv6", begin + 5, &addr->ipv6, errp) < 0) { 677 return -1; 678 } 679 addr->has_ipv6 = true; 680 } 681 begin = strstr(optstr, ",keep-alive"); 682 if (begin) { 683 if (inet_parse_flag("keep-alive", begin + strlen(",keep-alive"), 684 &addr->keep_alive, errp) < 0) 685 { 686 return -1; 687 } 688 addr->has_keep_alive = true; 689 } 690 return 0; 691 } 692 693 694 /** 695 * Create a blocking socket and connect it to an address. 696 * 697 * @str: address string 698 * @errp: set in case of an error 699 * 700 * Returns -1 in case of error, file descriptor on success 701 **/ 702 int inet_connect(const char *str, Error **errp) 703 { 704 int sock = -1; 705 InetSocketAddress *addr = g_new(InetSocketAddress, 1); 706 707 if (!inet_parse(addr, str, errp)) { 708 sock = inet_connect_saddr(addr, errp); 709 } 710 qapi_free_InetSocketAddress(addr); 711 return sock; 712 } 713 714 #ifdef CONFIG_AF_VSOCK 715 static bool vsock_parse_vaddr_to_sockaddr(const VsockSocketAddress *vaddr, 716 struct sockaddr_vm *svm, 717 Error **errp) 718 { 719 unsigned long long val; 720 721 memset(svm, 0, sizeof(*svm)); 722 svm->svm_family = AF_VSOCK; 723 724 if (parse_uint_full(vaddr->cid, &val, 10) < 0 || 725 val > UINT32_MAX) { 726 error_setg(errp, "Failed to parse cid '%s'", vaddr->cid); 727 return false; 728 } 729 svm->svm_cid = val; 730 731 if (parse_uint_full(vaddr->port, &val, 10) < 0 || 732 val > UINT32_MAX) { 733 error_setg(errp, "Failed to parse port '%s'", vaddr->port); 734 return false; 735 } 736 svm->svm_port = val; 737 738 return true; 739 } 740 741 static int vsock_connect_addr(const VsockSocketAddress *vaddr, 742 const struct sockaddr_vm *svm, Error **errp) 743 { 744 int sock, rc; 745 746 sock = qemu_socket(AF_VSOCK, SOCK_STREAM, 0); 747 if (sock < 0) { 748 error_setg_errno(errp, errno, "Failed to create socket family %d", 749 AF_VSOCK); 750 return -1; 751 } 752 753 /* connect to peer */ 754 do { 755 rc = 0; 756 if (connect(sock, (const struct sockaddr *)svm, sizeof(*svm)) < 0) { 757 rc = -errno; 758 } 759 } while (rc == -EINTR); 760 761 if (rc < 0) { 762 error_setg_errno(errp, errno, "Failed to connect to '%s:%s'", 763 vaddr->cid, vaddr->port); 764 closesocket(sock); 765 return -1; 766 } 767 768 return sock; 769 } 770 771 static int vsock_connect_saddr(VsockSocketAddress *vaddr, Error **errp) 772 { 773 struct sockaddr_vm svm; 774 775 if (!vsock_parse_vaddr_to_sockaddr(vaddr, &svm, errp)) { 776 return -1; 777 } 778 779 return vsock_connect_addr(vaddr, &svm, errp); 780 } 781 782 static int vsock_listen_saddr(VsockSocketAddress *vaddr, 783 int num, 784 Error **errp) 785 { 786 struct sockaddr_vm svm; 787 int slisten; 788 789 if (!vsock_parse_vaddr_to_sockaddr(vaddr, &svm, errp)) { 790 return -1; 791 } 792 793 slisten = qemu_socket(AF_VSOCK, SOCK_STREAM, 0); 794 if (slisten < 0) { 795 error_setg_errno(errp, errno, "Failed to create socket"); 796 return -1; 797 } 798 799 if (bind(slisten, (const struct sockaddr *)&svm, sizeof(svm)) != 0) { 800 error_setg_errno(errp, errno, "Failed to bind socket"); 801 closesocket(slisten); 802 return -1; 803 } 804 805 if (listen(slisten, num) != 0) { 806 error_setg_errno(errp, errno, "Failed to listen on socket"); 807 closesocket(slisten); 808 return -1; 809 } 810 return slisten; 811 } 812 813 static int vsock_parse(VsockSocketAddress *addr, const char *str, 814 Error **errp) 815 { 816 char cid[33]; 817 char port[33]; 818 int n; 819 820 if (sscanf(str, "%32[^:]:%32[^,]%n", cid, port, &n) != 2) { 821 error_setg(errp, "error parsing address '%s'", str); 822 return -1; 823 } 824 if (str[n] != '\0') { 825 error_setg(errp, "trailing characters in address '%s'", str); 826 return -1; 827 } 828 829 addr->cid = g_strdup(cid); 830 addr->port = g_strdup(port); 831 return 0; 832 } 833 #else 834 static void vsock_unsupported(Error **errp) 835 { 836 error_setg(errp, "socket family AF_VSOCK unsupported"); 837 } 838 839 static int vsock_connect_saddr(VsockSocketAddress *vaddr, Error **errp) 840 { 841 vsock_unsupported(errp); 842 return -1; 843 } 844 845 static int vsock_listen_saddr(VsockSocketAddress *vaddr, 846 int num, 847 Error **errp) 848 { 849 vsock_unsupported(errp); 850 return -1; 851 } 852 853 static int vsock_parse(VsockSocketAddress *addr, const char *str, 854 Error **errp) 855 { 856 vsock_unsupported(errp); 857 return -1; 858 } 859 #endif /* CONFIG_AF_VSOCK */ 860 861 #ifndef _WIN32 862 863 static int unix_listen_saddr(UnixSocketAddress *saddr, 864 int num, 865 Error **errp) 866 { 867 struct sockaddr_un un; 868 int sock, fd; 869 char *pathbuf = NULL; 870 const char *path; 871 size_t pathlen; 872 size_t addrlen; 873 874 sock = qemu_socket(PF_UNIX, SOCK_STREAM, 0); 875 if (sock < 0) { 876 error_setg_errno(errp, errno, "Failed to create Unix socket"); 877 return -1; 878 } 879 880 if (saddr->path && saddr->path[0]) { 881 path = saddr->path; 882 } else { 883 const char *tmpdir = getenv("TMPDIR"); 884 tmpdir = tmpdir ? tmpdir : "/tmp"; 885 path = pathbuf = g_strdup_printf("%s/qemu-socket-XXXXXX", tmpdir); 886 } 887 888 pathlen = strlen(path); 889 if (pathlen > sizeof(un.sun_path) || 890 (saddr->abstract && pathlen > (sizeof(un.sun_path) - 1))) { 891 error_setg(errp, "UNIX socket path '%s' is too long", path); 892 error_append_hint(errp, "Path must be less than %zu bytes\n", 893 saddr->abstract ? sizeof(un.sun_path) - 1 : 894 sizeof(un.sun_path)); 895 goto err; 896 } 897 898 if (pathbuf != NULL) { 899 /* 900 * This dummy fd usage silences the mktemp() unsecure warning. 901 * Using mkstemp() doesn't make things more secure here 902 * though. bind() complains about existing files, so we have 903 * to unlink first and thus re-open the race window. The 904 * worst case possible is bind() failing, i.e. a DoS attack. 905 */ 906 fd = mkstemp(pathbuf); 907 if (fd < 0) { 908 error_setg_errno(errp, errno, 909 "Failed to make a temporary socket %s", pathbuf); 910 goto err; 911 } 912 close(fd); 913 } 914 915 if (!saddr->abstract && unlink(path) < 0 && errno != ENOENT) { 916 error_setg_errno(errp, errno, 917 "Failed to unlink socket %s", path); 918 goto err; 919 } 920 921 memset(&un, 0, sizeof(un)); 922 un.sun_family = AF_UNIX; 923 addrlen = sizeof(un); 924 925 if (saddr->abstract) { 926 un.sun_path[0] = '\0'; 927 memcpy(&un.sun_path[1], path, pathlen); 928 if (saddr->tight) { 929 addrlen = offsetof(struct sockaddr_un, sun_path) + 1 + pathlen; 930 } 931 } else { 932 memcpy(un.sun_path, path, pathlen); 933 } 934 935 if (bind(sock, (struct sockaddr *) &un, addrlen) < 0) { 936 error_setg_errno(errp, errno, "Failed to bind socket to %s", path); 937 goto err; 938 } 939 if (listen(sock, num) < 0) { 940 error_setg_errno(errp, errno, "Failed to listen on socket"); 941 goto err; 942 } 943 944 g_free(pathbuf); 945 return sock; 946 947 err: 948 g_free(pathbuf); 949 closesocket(sock); 950 return -1; 951 } 952 953 static int unix_connect_saddr(UnixSocketAddress *saddr, Error **errp) 954 { 955 struct sockaddr_un un; 956 int sock, rc; 957 size_t pathlen; 958 size_t addrlen; 959 960 if (saddr->path == NULL) { 961 error_setg(errp, "unix connect: no path specified"); 962 return -1; 963 } 964 965 sock = qemu_socket(PF_UNIX, SOCK_STREAM, 0); 966 if (sock < 0) { 967 error_setg_errno(errp, errno, "Failed to create socket"); 968 return -1; 969 } 970 971 pathlen = strlen(saddr->path); 972 if (pathlen > sizeof(un.sun_path) || 973 (saddr->abstract && pathlen > (sizeof(un.sun_path) - 1))) { 974 error_setg(errp, "UNIX socket path '%s' is too long", saddr->path); 975 error_append_hint(errp, "Path must be less than %zu bytes\n", 976 saddr->abstract ? sizeof(un.sun_path) - 1 : 977 sizeof(un.sun_path)); 978 goto err; 979 } 980 981 memset(&un, 0, sizeof(un)); 982 un.sun_family = AF_UNIX; 983 addrlen = sizeof(un); 984 985 if (saddr->abstract) { 986 un.sun_path[0] = '\0'; 987 memcpy(&un.sun_path[1], saddr->path, pathlen); 988 if (saddr->tight) { 989 addrlen = offsetof(struct sockaddr_un, sun_path) + 1 + pathlen; 990 } 991 } else { 992 memcpy(un.sun_path, saddr->path, pathlen); 993 } 994 /* connect to peer */ 995 do { 996 rc = 0; 997 if (connect(sock, (struct sockaddr *) &un, addrlen) < 0) { 998 rc = -errno; 999 } 1000 } while (rc == -EINTR); 1001 1002 if (rc < 0) { 1003 error_setg_errno(errp, -rc, "Failed to connect to '%s'", 1004 saddr->path); 1005 goto err; 1006 } 1007 1008 return sock; 1009 1010 err: 1011 close(sock); 1012 return -1; 1013 } 1014 1015 #else 1016 1017 static int unix_listen_saddr(UnixSocketAddress *saddr, 1018 int num, 1019 Error **errp) 1020 { 1021 error_setg(errp, "unix sockets are not available on windows"); 1022 errno = ENOTSUP; 1023 return -1; 1024 } 1025 1026 static int unix_connect_saddr(UnixSocketAddress *saddr, Error **errp) 1027 { 1028 error_setg(errp, "unix sockets are not available on windows"); 1029 errno = ENOTSUP; 1030 return -1; 1031 } 1032 #endif 1033 1034 /* compatibility wrapper */ 1035 int unix_listen(const char *str, Error **errp) 1036 { 1037 UnixSocketAddress *saddr; 1038 int sock; 1039 1040 saddr = g_new0(UnixSocketAddress, 1); 1041 saddr->path = g_strdup(str); 1042 sock = unix_listen_saddr(saddr, 1, errp); 1043 qapi_free_UnixSocketAddress(saddr); 1044 return sock; 1045 } 1046 1047 int unix_connect(const char *path, Error **errp) 1048 { 1049 UnixSocketAddress *saddr; 1050 int sock; 1051 1052 saddr = g_new0(UnixSocketAddress, 1); 1053 saddr->path = g_strdup(path); 1054 sock = unix_connect_saddr(saddr, errp); 1055 qapi_free_UnixSocketAddress(saddr); 1056 return sock; 1057 } 1058 1059 1060 SocketAddress *socket_parse(const char *str, Error **errp) 1061 { 1062 SocketAddress *addr; 1063 1064 addr = g_new0(SocketAddress, 1); 1065 if (strstart(str, "unix:", NULL)) { 1066 if (str[5] == '\0') { 1067 error_setg(errp, "invalid Unix socket address"); 1068 goto fail; 1069 } else { 1070 addr->type = SOCKET_ADDRESS_TYPE_UNIX; 1071 addr->u.q_unix.path = g_strdup(str + 5); 1072 } 1073 } else if (strstart(str, "fd:", NULL)) { 1074 if (str[3] == '\0') { 1075 error_setg(errp, "invalid file descriptor address"); 1076 goto fail; 1077 } else { 1078 addr->type = SOCKET_ADDRESS_TYPE_FD; 1079 addr->u.fd.str = g_strdup(str + 3); 1080 } 1081 } else if (strstart(str, "vsock:", NULL)) { 1082 addr->type = SOCKET_ADDRESS_TYPE_VSOCK; 1083 if (vsock_parse(&addr->u.vsock, str + strlen("vsock:"), errp)) { 1084 goto fail; 1085 } 1086 } else { 1087 addr->type = SOCKET_ADDRESS_TYPE_INET; 1088 if (inet_parse(&addr->u.inet, str, errp)) { 1089 goto fail; 1090 } 1091 } 1092 return addr; 1093 1094 fail: 1095 qapi_free_SocketAddress(addr); 1096 return NULL; 1097 } 1098 1099 static int socket_get_fd(const char *fdstr, int num, Error **errp) 1100 { 1101 Monitor *cur_mon = monitor_cur(); 1102 int fd; 1103 if (num != 1) { 1104 error_setg_errno(errp, EINVAL, "socket_get_fd: too many connections"); 1105 return -1; 1106 } 1107 if (cur_mon) { 1108 fd = monitor_get_fd(cur_mon, fdstr, errp); 1109 if (fd < 0) { 1110 return -1; 1111 } 1112 } else { 1113 if (qemu_strtoi(fdstr, NULL, 10, &fd) < 0) { 1114 error_setg_errno(errp, errno, 1115 "Unable to parse FD number %s", 1116 fdstr); 1117 return -1; 1118 } 1119 } 1120 if (!fd_is_socket(fd)) { 1121 error_setg(errp, "File descriptor '%s' is not a socket", fdstr); 1122 close(fd); 1123 return -1; 1124 } 1125 return fd; 1126 } 1127 1128 int socket_connect(SocketAddress *addr, Error **errp) 1129 { 1130 int fd; 1131 1132 switch (addr->type) { 1133 case SOCKET_ADDRESS_TYPE_INET: 1134 fd = inet_connect_saddr(&addr->u.inet, errp); 1135 break; 1136 1137 case SOCKET_ADDRESS_TYPE_UNIX: 1138 fd = unix_connect_saddr(&addr->u.q_unix, errp); 1139 break; 1140 1141 case SOCKET_ADDRESS_TYPE_FD: 1142 fd = socket_get_fd(addr->u.fd.str, 1, errp); 1143 break; 1144 1145 case SOCKET_ADDRESS_TYPE_VSOCK: 1146 fd = vsock_connect_saddr(&addr->u.vsock, errp); 1147 break; 1148 1149 default: 1150 abort(); 1151 } 1152 return fd; 1153 } 1154 1155 int socket_listen(SocketAddress *addr, int num, Error **errp) 1156 { 1157 int fd; 1158 1159 trace_socket_listen(num); 1160 switch (addr->type) { 1161 case SOCKET_ADDRESS_TYPE_INET: 1162 fd = inet_listen_saddr(&addr->u.inet, 0, num, errp); 1163 break; 1164 1165 case SOCKET_ADDRESS_TYPE_UNIX: 1166 fd = unix_listen_saddr(&addr->u.q_unix, num, errp); 1167 break; 1168 1169 case SOCKET_ADDRESS_TYPE_FD: 1170 fd = socket_get_fd(addr->u.fd.str, num, errp); 1171 break; 1172 1173 case SOCKET_ADDRESS_TYPE_VSOCK: 1174 fd = vsock_listen_saddr(&addr->u.vsock, num, errp); 1175 break; 1176 1177 default: 1178 abort(); 1179 } 1180 return fd; 1181 } 1182 1183 void socket_listen_cleanup(int fd, Error **errp) 1184 { 1185 SocketAddress *addr; 1186 1187 addr = socket_local_address(fd, errp); 1188 if (!addr) { 1189 return; 1190 } 1191 1192 if (addr->type == SOCKET_ADDRESS_TYPE_UNIX 1193 && addr->u.q_unix.path) { 1194 if (unlink(addr->u.q_unix.path) < 0 && errno != ENOENT) { 1195 error_setg_errno(errp, errno, 1196 "Failed to unlink socket %s", 1197 addr->u.q_unix.path); 1198 } 1199 } 1200 1201 qapi_free_SocketAddress(addr); 1202 } 1203 1204 int socket_dgram(SocketAddress *remote, SocketAddress *local, Error **errp) 1205 { 1206 int fd; 1207 1208 /* 1209 * TODO SOCKET_ADDRESS_TYPE_FD when fd is AF_INET or AF_INET6 1210 * (although other address families can do SOCK_DGRAM, too) 1211 */ 1212 switch (remote->type) { 1213 case SOCKET_ADDRESS_TYPE_INET: 1214 fd = inet_dgram_saddr(&remote->u.inet, 1215 local ? &local->u.inet : NULL, errp); 1216 break; 1217 1218 default: 1219 error_setg(errp, "socket type unsupported for datagram"); 1220 fd = -1; 1221 } 1222 return fd; 1223 } 1224 1225 1226 static SocketAddress * 1227 socket_sockaddr_to_address_inet(struct sockaddr_storage *sa, 1228 socklen_t salen, 1229 Error **errp) 1230 { 1231 char host[NI_MAXHOST]; 1232 char serv[NI_MAXSERV]; 1233 SocketAddress *addr; 1234 InetSocketAddress *inet; 1235 int ret; 1236 1237 ret = getnameinfo((struct sockaddr *)sa, salen, 1238 host, sizeof(host), 1239 serv, sizeof(serv), 1240 NI_NUMERICHOST | NI_NUMERICSERV); 1241 if (ret != 0) { 1242 error_setg(errp, "Cannot format numeric socket address: %s", 1243 gai_strerror(ret)); 1244 return NULL; 1245 } 1246 1247 addr = g_new0(SocketAddress, 1); 1248 addr->type = SOCKET_ADDRESS_TYPE_INET; 1249 inet = &addr->u.inet; 1250 inet->host = g_strdup(host); 1251 inet->port = g_strdup(serv); 1252 if (sa->ss_family == AF_INET) { 1253 inet->has_ipv4 = inet->ipv4 = true; 1254 } else { 1255 inet->has_ipv6 = inet->ipv6 = true; 1256 } 1257 1258 return addr; 1259 } 1260 1261 1262 #ifndef WIN32 1263 static SocketAddress * 1264 socket_sockaddr_to_address_unix(struct sockaddr_storage *sa, 1265 socklen_t salen, 1266 Error **errp) 1267 { 1268 SocketAddress *addr; 1269 struct sockaddr_un *su = (struct sockaddr_un *)sa; 1270 1271 addr = g_new0(SocketAddress, 1); 1272 addr->type = SOCKET_ADDRESS_TYPE_UNIX; 1273 if (su->sun_path[0]) { 1274 addr->u.q_unix.path = g_strndup(su->sun_path, sizeof(su->sun_path)); 1275 } 1276 1277 return addr; 1278 } 1279 #endif /* WIN32 */ 1280 1281 #ifdef CONFIG_AF_VSOCK 1282 static SocketAddress * 1283 socket_sockaddr_to_address_vsock(struct sockaddr_storage *sa, 1284 socklen_t salen, 1285 Error **errp) 1286 { 1287 SocketAddress *addr; 1288 VsockSocketAddress *vaddr; 1289 struct sockaddr_vm *svm = (struct sockaddr_vm *)sa; 1290 1291 addr = g_new0(SocketAddress, 1); 1292 addr->type = SOCKET_ADDRESS_TYPE_VSOCK; 1293 vaddr = &addr->u.vsock; 1294 vaddr->cid = g_strdup_printf("%u", svm->svm_cid); 1295 vaddr->port = g_strdup_printf("%u", svm->svm_port); 1296 1297 return addr; 1298 } 1299 #endif /* CONFIG_AF_VSOCK */ 1300 1301 SocketAddress * 1302 socket_sockaddr_to_address(struct sockaddr_storage *sa, 1303 socklen_t salen, 1304 Error **errp) 1305 { 1306 switch (sa->ss_family) { 1307 case AF_INET: 1308 case AF_INET6: 1309 return socket_sockaddr_to_address_inet(sa, salen, errp); 1310 1311 #ifndef WIN32 1312 case AF_UNIX: 1313 return socket_sockaddr_to_address_unix(sa, salen, errp); 1314 #endif /* WIN32 */ 1315 1316 #ifdef CONFIG_AF_VSOCK 1317 case AF_VSOCK: 1318 return socket_sockaddr_to_address_vsock(sa, salen, errp); 1319 #endif 1320 1321 default: 1322 error_setg(errp, "socket family %d unsupported", 1323 sa->ss_family); 1324 return NULL; 1325 } 1326 return 0; 1327 } 1328 1329 1330 SocketAddress *socket_local_address(int fd, Error **errp) 1331 { 1332 struct sockaddr_storage ss; 1333 socklen_t sslen = sizeof(ss); 1334 1335 if (getsockname(fd, (struct sockaddr *)&ss, &sslen) < 0) { 1336 error_setg_errno(errp, errno, "%s", 1337 "Unable to query local socket address"); 1338 return NULL; 1339 } 1340 1341 return socket_sockaddr_to_address(&ss, sslen, errp); 1342 } 1343 1344 1345 SocketAddress *socket_remote_address(int fd, Error **errp) 1346 { 1347 struct sockaddr_storage ss; 1348 socklen_t sslen = sizeof(ss); 1349 1350 if (getpeername(fd, (struct sockaddr *)&ss, &sslen) < 0) { 1351 error_setg_errno(errp, errno, "%s", 1352 "Unable to query remote socket address"); 1353 return NULL; 1354 } 1355 1356 return socket_sockaddr_to_address(&ss, sslen, errp); 1357 } 1358 1359 1360 SocketAddress *socket_address_flatten(SocketAddressLegacy *addr_legacy) 1361 { 1362 SocketAddress *addr; 1363 1364 if (!addr_legacy) { 1365 return NULL; 1366 } 1367 1368 addr = g_new(SocketAddress, 1); 1369 1370 switch (addr_legacy->type) { 1371 case SOCKET_ADDRESS_LEGACY_KIND_INET: 1372 addr->type = SOCKET_ADDRESS_TYPE_INET; 1373 QAPI_CLONE_MEMBERS(InetSocketAddress, &addr->u.inet, 1374 addr_legacy->u.inet.data); 1375 break; 1376 case SOCKET_ADDRESS_LEGACY_KIND_UNIX: 1377 addr->type = SOCKET_ADDRESS_TYPE_UNIX; 1378 QAPI_CLONE_MEMBERS(UnixSocketAddress, &addr->u.q_unix, 1379 addr_legacy->u.q_unix.data); 1380 break; 1381 case SOCKET_ADDRESS_LEGACY_KIND_VSOCK: 1382 addr->type = SOCKET_ADDRESS_TYPE_VSOCK; 1383 QAPI_CLONE_MEMBERS(VsockSocketAddress, &addr->u.vsock, 1384 addr_legacy->u.vsock.data); 1385 break; 1386 case SOCKET_ADDRESS_LEGACY_KIND_FD: 1387 addr->type = SOCKET_ADDRESS_TYPE_FD; 1388 QAPI_CLONE_MEMBERS(String, &addr->u.fd, addr_legacy->u.fd.data); 1389 break; 1390 default: 1391 abort(); 1392 } 1393 1394 return addr; 1395 } 1396