1 /* 2 * QEMU System Emulator 3 * 4 * Copyright (c) 2003-2008 Fabrice Bellard 5 * 6 * Permission is hereby granted, free of charge, to any person obtaining a copy 7 * of this software and associated documentation files (the "Software"), to deal 8 * in the Software without restriction, including without limitation the rights 9 * to use, copy, modify, merge, publish, distribute, sublicense, and/or sell 10 * copies of the Software, and to permit persons to whom the Software is 11 * furnished to do so, subject to the following conditions: 12 * 13 * The above copyright notice and this permission notice shall be included in 14 * all copies or substantial portions of the Software. 15 * 16 * THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR 17 * IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY, 18 * FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL 19 * THE AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER 20 * LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM, 21 * OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN 22 * THE SOFTWARE. 23 */ 24 25 #include "qemu/osdep.h" 26 #include "qemu/log.h" 27 #include "net/slirp.h" 28 29 30 #ifndef _WIN32 31 #include <pwd.h> 32 #include <sys/wait.h> 33 #endif 34 #include "net/eth.h" 35 #include "net/net.h" 36 #include "clients.h" 37 #include "hub.h" 38 #include "monitor/monitor.h" 39 #include "qemu/error-report.h" 40 #include "qemu/sockets.h" 41 #include <libslirp.h> 42 #include "chardev/char-fe.h" 43 #include "sysemu/sysemu.h" 44 #include "qemu/cutils.h" 45 #include "qapi/error.h" 46 #include "qapi/qmp/qdict.h" 47 #include "util.h" 48 #include "migration/register.h" 49 #include "migration/qemu-file-types.h" 50 51 static int get_str_sep(char *buf, int buf_size, const char **pp, int sep) 52 { 53 const char *p, *p1; 54 int len; 55 p = *pp; 56 p1 = strchr(p, sep); 57 if (!p1) 58 return -1; 59 len = p1 - p; 60 p1++; 61 if (buf_size > 0) { 62 if (len > buf_size - 1) 63 len = buf_size - 1; 64 memcpy(buf, p, len); 65 buf[len] = '\0'; 66 } 67 *pp = p1; 68 return 0; 69 } 70 71 /* slirp network adapter */ 72 73 #define SLIRP_CFG_HOSTFWD 1 74 75 struct slirp_config_str { 76 struct slirp_config_str *next; 77 int flags; 78 char str[1024]; 79 }; 80 81 struct GuestFwd { 82 CharBackend hd; 83 struct in_addr server; 84 int port; 85 Slirp *slirp; 86 }; 87 88 typedef struct SlirpState { 89 NetClientState nc; 90 QTAILQ_ENTRY(SlirpState) entry; 91 Slirp *slirp; 92 Notifier poll_notifier; 93 Notifier exit_notifier; 94 #ifndef _WIN32 95 gchar *smb_dir; 96 #endif 97 GSList *fwd; 98 } SlirpState; 99 100 static struct slirp_config_str *slirp_configs; 101 static QTAILQ_HEAD(, SlirpState) slirp_stacks = 102 QTAILQ_HEAD_INITIALIZER(slirp_stacks); 103 104 static int slirp_hostfwd(SlirpState *s, const char *redir_str, Error **errp); 105 static int slirp_guestfwd(SlirpState *s, const char *config_str, Error **errp); 106 107 #ifndef _WIN32 108 static int slirp_smb(SlirpState *s, const char *exported_dir, 109 struct in_addr vserver_addr, Error **errp); 110 static void slirp_smb_cleanup(SlirpState *s); 111 #else 112 static inline void slirp_smb_cleanup(SlirpState *s) { } 113 #endif 114 115 static ssize_t net_slirp_send_packet(const void *pkt, size_t pkt_len, 116 void *opaque) 117 { 118 SlirpState *s = opaque; 119 uint8_t min_pkt[ETH_ZLEN]; 120 size_t min_pktsz = sizeof(min_pkt); 121 122 if (!s->nc.peer->do_not_pad) { 123 if (eth_pad_short_frame(min_pkt, &min_pktsz, pkt, pkt_len)) { 124 pkt = min_pkt; 125 pkt_len = min_pktsz; 126 } 127 } 128 129 return qemu_send_packet(&s->nc, pkt, pkt_len); 130 } 131 132 static ssize_t net_slirp_receive(NetClientState *nc, const uint8_t *buf, size_t size) 133 { 134 SlirpState *s = DO_UPCAST(SlirpState, nc, nc); 135 136 slirp_input(s->slirp, buf, size); 137 138 return size; 139 } 140 141 static void slirp_smb_exit(Notifier *n, void *data) 142 { 143 SlirpState *s = container_of(n, SlirpState, exit_notifier); 144 slirp_smb_cleanup(s); 145 } 146 147 static void slirp_free_fwd(gpointer data) 148 { 149 struct GuestFwd *fwd = data; 150 151 qemu_chr_fe_deinit(&fwd->hd, true); 152 g_free(data); 153 } 154 155 static void net_slirp_cleanup(NetClientState *nc) 156 { 157 SlirpState *s = DO_UPCAST(SlirpState, nc, nc); 158 159 g_slist_free_full(s->fwd, slirp_free_fwd); 160 main_loop_poll_remove_notifier(&s->poll_notifier); 161 unregister_savevm(NULL, "slirp", s->slirp); 162 slirp_cleanup(s->slirp); 163 if (s->exit_notifier.notify) { 164 qemu_remove_exit_notifier(&s->exit_notifier); 165 } 166 slirp_smb_cleanup(s); 167 QTAILQ_REMOVE(&slirp_stacks, s, entry); 168 } 169 170 static NetClientInfo net_slirp_info = { 171 .type = NET_CLIENT_DRIVER_USER, 172 .size = sizeof(SlirpState), 173 .receive = net_slirp_receive, 174 .cleanup = net_slirp_cleanup, 175 }; 176 177 static void net_slirp_guest_error(const char *msg, void *opaque) 178 { 179 qemu_log_mask(LOG_GUEST_ERROR, "%s", msg); 180 } 181 182 static int64_t net_slirp_clock_get_ns(void *opaque) 183 { 184 return qemu_clock_get_ns(QEMU_CLOCK_VIRTUAL); 185 } 186 187 static void *net_slirp_timer_new(SlirpTimerCb cb, 188 void *cb_opaque, void *opaque) 189 { 190 return timer_new_full(NULL, QEMU_CLOCK_VIRTUAL, 191 SCALE_MS, QEMU_TIMER_ATTR_EXTERNAL, 192 cb, cb_opaque); 193 } 194 195 static void net_slirp_timer_free(void *timer, void *opaque) 196 { 197 timer_free(timer); 198 } 199 200 static void net_slirp_timer_mod(void *timer, int64_t expire_timer, 201 void *opaque) 202 { 203 timer_mod(timer, expire_timer); 204 } 205 206 static void net_slirp_register_poll_fd(int fd, void *opaque) 207 { 208 qemu_fd_register(fd); 209 } 210 211 static void net_slirp_unregister_poll_fd(int fd, void *opaque) 212 { 213 /* no qemu_fd_unregister */ 214 } 215 216 static void net_slirp_notify(void *opaque) 217 { 218 qemu_notify_event(); 219 } 220 221 static const SlirpCb slirp_cb = { 222 .send_packet = net_slirp_send_packet, 223 .guest_error = net_slirp_guest_error, 224 .clock_get_ns = net_slirp_clock_get_ns, 225 .timer_new = net_slirp_timer_new, 226 .timer_free = net_slirp_timer_free, 227 .timer_mod = net_slirp_timer_mod, 228 .register_poll_fd = net_slirp_register_poll_fd, 229 .unregister_poll_fd = net_slirp_unregister_poll_fd, 230 .notify = net_slirp_notify, 231 }; 232 233 static int slirp_poll_to_gio(int events) 234 { 235 int ret = 0; 236 237 if (events & SLIRP_POLL_IN) { 238 ret |= G_IO_IN; 239 } 240 if (events & SLIRP_POLL_OUT) { 241 ret |= G_IO_OUT; 242 } 243 if (events & SLIRP_POLL_PRI) { 244 ret |= G_IO_PRI; 245 } 246 if (events & SLIRP_POLL_ERR) { 247 ret |= G_IO_ERR; 248 } 249 if (events & SLIRP_POLL_HUP) { 250 ret |= G_IO_HUP; 251 } 252 253 return ret; 254 } 255 256 static int net_slirp_add_poll(int fd, int events, void *opaque) 257 { 258 GArray *pollfds = opaque; 259 GPollFD pfd = { 260 .fd = fd, 261 .events = slirp_poll_to_gio(events), 262 }; 263 int idx = pollfds->len; 264 g_array_append_val(pollfds, pfd); 265 return idx; 266 } 267 268 static int slirp_gio_to_poll(int events) 269 { 270 int ret = 0; 271 272 if (events & G_IO_IN) { 273 ret |= SLIRP_POLL_IN; 274 } 275 if (events & G_IO_OUT) { 276 ret |= SLIRP_POLL_OUT; 277 } 278 if (events & G_IO_PRI) { 279 ret |= SLIRP_POLL_PRI; 280 } 281 if (events & G_IO_ERR) { 282 ret |= SLIRP_POLL_ERR; 283 } 284 if (events & G_IO_HUP) { 285 ret |= SLIRP_POLL_HUP; 286 } 287 288 return ret; 289 } 290 291 static int net_slirp_get_revents(int idx, void *opaque) 292 { 293 GArray *pollfds = opaque; 294 295 return slirp_gio_to_poll(g_array_index(pollfds, GPollFD, idx).revents); 296 } 297 298 static void net_slirp_poll_notify(Notifier *notifier, void *data) 299 { 300 MainLoopPoll *poll = data; 301 SlirpState *s = container_of(notifier, SlirpState, poll_notifier); 302 303 switch (poll->state) { 304 case MAIN_LOOP_POLL_FILL: 305 slirp_pollfds_fill(s->slirp, &poll->timeout, 306 net_slirp_add_poll, poll->pollfds); 307 break; 308 case MAIN_LOOP_POLL_OK: 309 case MAIN_LOOP_POLL_ERR: 310 slirp_pollfds_poll(s->slirp, poll->state == MAIN_LOOP_POLL_ERR, 311 net_slirp_get_revents, poll->pollfds); 312 break; 313 default: 314 g_assert_not_reached(); 315 } 316 } 317 318 static ssize_t 319 net_slirp_stream_read(void *buf, size_t size, void *opaque) 320 { 321 QEMUFile *f = opaque; 322 323 return qemu_get_buffer(f, buf, size); 324 } 325 326 static ssize_t 327 net_slirp_stream_write(const void *buf, size_t size, void *opaque) 328 { 329 QEMUFile *f = opaque; 330 331 qemu_put_buffer(f, buf, size); 332 if (qemu_file_get_error(f)) { 333 return -1; 334 } 335 336 return size; 337 } 338 339 static int net_slirp_state_load(QEMUFile *f, void *opaque, int version_id) 340 { 341 Slirp *slirp = opaque; 342 343 return slirp_state_load(slirp, version_id, net_slirp_stream_read, f); 344 } 345 346 static void net_slirp_state_save(QEMUFile *f, void *opaque) 347 { 348 Slirp *slirp = opaque; 349 350 slirp_state_save(slirp, net_slirp_stream_write, f); 351 } 352 353 static SaveVMHandlers savevm_slirp_state = { 354 .save_state = net_slirp_state_save, 355 .load_state = net_slirp_state_load, 356 }; 357 358 static int net_slirp_init(NetClientState *peer, const char *model, 359 const char *name, int restricted, 360 bool ipv4, const char *vnetwork, const char *vhost, 361 bool ipv6, const char *vprefix6, int vprefix6_len, 362 const char *vhost6, 363 const char *vhostname, const char *tftp_export, 364 const char *bootfile, const char *vdhcp_start, 365 const char *vnameserver, const char *vnameserver6, 366 const char *smb_export, const char *vsmbserver, 367 const char **dnssearch, const char *vdomainname, 368 const char *tftp_server_name, 369 Error **errp) 370 { 371 /* default settings according to historic slirp */ 372 struct in_addr net = { .s_addr = htonl(0x0a000200) }; /* 10.0.2.0 */ 373 struct in_addr mask = { .s_addr = htonl(0xffffff00) }; /* 255.255.255.0 */ 374 struct in_addr host = { .s_addr = htonl(0x0a000202) }; /* 10.0.2.2 */ 375 struct in_addr dhcp = { .s_addr = htonl(0x0a00020f) }; /* 10.0.2.15 */ 376 struct in_addr dns = { .s_addr = htonl(0x0a000203) }; /* 10.0.2.3 */ 377 struct in6_addr ip6_prefix; 378 struct in6_addr ip6_host; 379 struct in6_addr ip6_dns; 380 #ifndef _WIN32 381 struct in_addr smbsrv = { .s_addr = 0 }; 382 #endif 383 NetClientState *nc; 384 SlirpState *s; 385 char buf[20]; 386 uint32_t addr; 387 int shift; 388 char *end; 389 struct slirp_config_str *config; 390 NetdevUserOptions *stored; 391 StringList **stored_hostfwd; 392 StringList **stored_guestfwd; 393 394 if (!ipv4 && (vnetwork || vhost || vnameserver)) { 395 error_setg(errp, "IPv4 disabled but netmask/host/dns provided"); 396 return -1; 397 } 398 399 if (!ipv6 && (vprefix6 || vhost6 || vnameserver6)) { 400 error_setg(errp, "IPv6 disabled but prefix/host6/dns6 provided"); 401 return -1; 402 } 403 404 if (!ipv4 && !ipv6) { 405 /* It doesn't make sense to disable both */ 406 error_setg(errp, "IPv4 and IPv6 disabled"); 407 return -1; 408 } 409 410 if (vnetwork) { 411 if (get_str_sep(buf, sizeof(buf), &vnetwork, '/') < 0) { 412 if (!inet_aton(vnetwork, &net)) { 413 error_setg(errp, "Failed to parse netmask"); 414 return -1; 415 } 416 addr = ntohl(net.s_addr); 417 if (!(addr & 0x80000000)) { 418 mask.s_addr = htonl(0xff000000); /* class A */ 419 } else if ((addr & 0xfff00000) == 0xac100000) { 420 mask.s_addr = htonl(0xfff00000); /* priv. 172.16.0.0/12 */ 421 } else if ((addr & 0xc0000000) == 0x80000000) { 422 mask.s_addr = htonl(0xffff0000); /* class B */ 423 } else if ((addr & 0xffff0000) == 0xc0a80000) { 424 mask.s_addr = htonl(0xffff0000); /* priv. 192.168.0.0/16 */ 425 } else if ((addr & 0xffff0000) == 0xc6120000) { 426 mask.s_addr = htonl(0xfffe0000); /* tests 198.18.0.0/15 */ 427 } else if ((addr & 0xe0000000) == 0xe0000000) { 428 mask.s_addr = htonl(0xffffff00); /* class C */ 429 } else { 430 mask.s_addr = htonl(0xfffffff0); /* multicast/reserved */ 431 } 432 } else { 433 if (!inet_aton(buf, &net)) { 434 error_setg(errp, "Failed to parse netmask"); 435 return -1; 436 } 437 shift = strtol(vnetwork, &end, 10); 438 if (*end != '\0') { 439 if (!inet_aton(vnetwork, &mask)) { 440 error_setg(errp, 441 "Failed to parse netmask (trailing chars)"); 442 return -1; 443 } 444 } else if (shift < 4 || shift > 32) { 445 error_setg(errp, 446 "Invalid netmask provided (must be in range 4-32)"); 447 return -1; 448 } else { 449 mask.s_addr = htonl(0xffffffff << (32 - shift)); 450 } 451 } 452 net.s_addr &= mask.s_addr; 453 host.s_addr = net.s_addr | (htonl(0x0202) & ~mask.s_addr); 454 dhcp.s_addr = net.s_addr | (htonl(0x020f) & ~mask.s_addr); 455 dns.s_addr = net.s_addr | (htonl(0x0203) & ~mask.s_addr); 456 } 457 458 if (vhost && !inet_aton(vhost, &host)) { 459 error_setg(errp, "Failed to parse host"); 460 return -1; 461 } 462 if ((host.s_addr & mask.s_addr) != net.s_addr) { 463 error_setg(errp, "Host doesn't belong to network"); 464 return -1; 465 } 466 467 if (vnameserver && !inet_aton(vnameserver, &dns)) { 468 error_setg(errp, "Failed to parse DNS"); 469 return -1; 470 } 471 if (restricted && (dns.s_addr & mask.s_addr) != net.s_addr) { 472 error_setg(errp, "DNS doesn't belong to network"); 473 return -1; 474 } 475 if (dns.s_addr == host.s_addr) { 476 error_setg(errp, "DNS must be different from host"); 477 return -1; 478 } 479 480 if (vdhcp_start && !inet_aton(vdhcp_start, &dhcp)) { 481 error_setg(errp, "Failed to parse DHCP start address"); 482 return -1; 483 } 484 if ((dhcp.s_addr & mask.s_addr) != net.s_addr) { 485 error_setg(errp, "DHCP doesn't belong to network"); 486 return -1; 487 } 488 if (dhcp.s_addr == host.s_addr || dhcp.s_addr == dns.s_addr) { 489 error_setg(errp, "DHCP must be different from host and DNS"); 490 return -1; 491 } 492 493 #ifndef _WIN32 494 if (vsmbserver && !inet_aton(vsmbserver, &smbsrv)) { 495 error_setg(errp, "Failed to parse SMB address"); 496 return -1; 497 } 498 #endif 499 500 if (!vprefix6) { 501 vprefix6 = "fec0::"; 502 } 503 if (!inet_pton(AF_INET6, vprefix6, &ip6_prefix)) { 504 error_setg(errp, "Failed to parse IPv6 prefix"); 505 return -1; 506 } 507 508 if (!vprefix6_len) { 509 vprefix6_len = 64; 510 } 511 if (vprefix6_len < 0 || vprefix6_len > 126) { 512 error_setg(errp, 513 "Invalid IPv6 prefix provided " 514 "(IPv6 prefix length must be between 0 and 126)"); 515 return -1; 516 } 517 518 if (vhost6) { 519 if (!inet_pton(AF_INET6, vhost6, &ip6_host)) { 520 error_setg(errp, "Failed to parse IPv6 host"); 521 return -1; 522 } 523 if (!in6_equal_net(&ip6_prefix, &ip6_host, vprefix6_len)) { 524 error_setg(errp, "IPv6 Host doesn't belong to network"); 525 return -1; 526 } 527 } else { 528 ip6_host = ip6_prefix; 529 ip6_host.s6_addr[15] |= 2; 530 } 531 532 if (vnameserver6) { 533 if (!inet_pton(AF_INET6, vnameserver6, &ip6_dns)) { 534 error_setg(errp, "Failed to parse IPv6 DNS"); 535 return -1; 536 } 537 if (restricted && !in6_equal_net(&ip6_prefix, &ip6_dns, vprefix6_len)) { 538 error_setg(errp, "IPv6 DNS doesn't belong to network"); 539 return -1; 540 } 541 } else { 542 ip6_dns = ip6_prefix; 543 ip6_dns.s6_addr[15] |= 3; 544 } 545 546 if (vdomainname && !*vdomainname) { 547 error_setg(errp, "'domainname' parameter cannot be empty"); 548 return -1; 549 } 550 551 if (vdomainname && strlen(vdomainname) > 255) { 552 error_setg(errp, "'domainname' parameter cannot exceed 255 bytes"); 553 return -1; 554 } 555 556 if (vhostname && strlen(vhostname) > 255) { 557 error_setg(errp, "'vhostname' parameter cannot exceed 255 bytes"); 558 return -1; 559 } 560 561 if (tftp_server_name && strlen(tftp_server_name) > 255) { 562 error_setg(errp, "'tftp-server-name' parameter cannot exceed 255 bytes"); 563 return -1; 564 } 565 566 nc = qemu_new_net_client(&net_slirp_info, peer, model, name); 567 568 /* Store startup parameters */ 569 nc->stored_config = g_new0(NetdevInfo, 1); 570 nc->stored_config->type = NET_BACKEND_USER; 571 stored = &nc->stored_config->u.user; 572 573 if (vhostname) { 574 stored->has_hostname = true; 575 stored->hostname = g_strdup(vhostname); 576 } 577 578 stored->has_q_restrict = true; 579 stored->q_restrict = restricted; 580 581 stored->has_ipv4 = true; 582 stored->ipv4 = ipv4; 583 584 stored->has_ipv6 = true; 585 stored->ipv6 = ipv6; 586 587 if (ipv4) { 588 uint8_t *net_bytes = (uint8_t *)&net; 589 uint8_t *mask_bytes = (uint8_t *)&mask; 590 591 stored->has_net = true; 592 stored->net = g_strdup_printf("%d.%d.%d.%d/%d.%d.%d.%d", 593 net_bytes[0], net_bytes[1], 594 net_bytes[2], net_bytes[3], 595 mask_bytes[0], mask_bytes[1], 596 mask_bytes[2], mask_bytes[3]); 597 598 stored->has_host = true; 599 stored->host = g_strdup(inet_ntoa(host)); 600 } 601 602 if (tftp_export) { 603 stored->has_tftp = true; 604 stored->tftp = g_strdup(tftp_export); 605 } 606 607 if (bootfile) { 608 stored->has_bootfile = true; 609 stored->bootfile = g_strdup(bootfile); 610 } 611 612 if (vdhcp_start) { 613 stored->has_dhcpstart = true; 614 stored->dhcpstart = g_strdup(vdhcp_start); 615 } 616 617 if (ipv4) { 618 stored->has_dns = true; 619 stored->dns = g_strdup(inet_ntoa(dns)); 620 } 621 622 if (dnssearch) { 623 stored->has_dnssearch = true; 624 StringList **stored_list = &stored->dnssearch; 625 626 for (int i = 0; dnssearch[i]; i++) { 627 String *element = g_new0(String, 1); 628 629 element->str = g_strdup(dnssearch[i]); 630 QAPI_LIST_APPEND(stored_list, element); 631 } 632 } 633 634 if (vdomainname) { 635 stored->has_domainname = true; 636 stored->domainname = g_strdup(vdomainname); 637 } 638 639 if (ipv6) { 640 char addrstr[INET6_ADDRSTRLEN]; 641 const char *res; 642 643 stored->has_ipv6_prefix = true; 644 stored->ipv6_prefix = g_strdup(vprefix6); 645 646 stored->has_ipv6_prefixlen = true; 647 stored->ipv6_prefixlen = vprefix6_len; 648 649 res = inet_ntop(AF_INET6, &ip6_host, 650 addrstr, sizeof(addrstr)); 651 652 stored->has_ipv6_host = true; 653 stored->ipv6_host = g_strdup(res); 654 655 res = inet_ntop(AF_INET6, &ip6_dns, 656 addrstr, sizeof(addrstr)); 657 658 stored->has_ipv6_dns = true; 659 stored->ipv6_dns = g_strdup(res); 660 } 661 662 if (smb_export) { 663 stored->has_smb = true; 664 stored->smb = g_strdup(smb_export); 665 } 666 667 if (vsmbserver) { 668 stored->has_smbserver = true; 669 stored->smbserver = g_strdup(vsmbserver); 670 } 671 672 if (tftp_server_name) { 673 stored->has_tftp_server_name = true; 674 stored->tftp_server_name = g_strdup(tftp_server_name); 675 } 676 677 s = DO_UPCAST(SlirpState, nc, nc); 678 679 s->slirp = slirp_init(restricted, ipv4, net, mask, host, 680 ipv6, ip6_prefix, vprefix6_len, ip6_host, 681 vhostname, tftp_server_name, 682 tftp_export, bootfile, dhcp, 683 dns, ip6_dns, dnssearch, vdomainname, 684 &slirp_cb, s); 685 QTAILQ_INSERT_TAIL(&slirp_stacks, s, entry); 686 687 /* 688 * Make sure the current bitstream version of slirp is 4, to avoid 689 * QEMU migration incompatibilities, if upstream slirp bumped the 690 * version. 691 * 692 * FIXME: use bitfields of features? teach libslirp to save with 693 * specific version? 694 */ 695 g_assert(slirp_state_version() == 4); 696 register_savevm_live("slirp", 0, slirp_state_version(), 697 &savevm_slirp_state, s->slirp); 698 699 s->poll_notifier.notify = net_slirp_poll_notify; 700 main_loop_poll_add_notifier(&s->poll_notifier); 701 702 stored_hostfwd = &stored->hostfwd; 703 stored_guestfwd = &stored->guestfwd; 704 705 for (config = slirp_configs; config; config = config->next) { 706 String *element = g_new0(String, 1); 707 708 element->str = g_strdup(config->str); 709 if (config->flags & SLIRP_CFG_HOSTFWD) { 710 if (slirp_hostfwd(s, config->str, errp) < 0) { 711 goto error; 712 } 713 stored->has_hostfwd = true; 714 QAPI_LIST_APPEND(stored_hostfwd, element); 715 } else { 716 if (slirp_guestfwd(s, config->str, errp) < 0) { 717 goto error; 718 } 719 stored->has_guestfwd = true; 720 QAPI_LIST_APPEND(stored_guestfwd, element); 721 } 722 } 723 #ifndef _WIN32 724 if (smb_export) { 725 if (slirp_smb(s, smb_export, smbsrv, errp) < 0) { 726 goto error; 727 } 728 } 729 #endif 730 731 s->exit_notifier.notify = slirp_smb_exit; 732 qemu_add_exit_notifier(&s->exit_notifier); 733 return 0; 734 735 error: 736 qemu_del_net_client(nc); 737 return -1; 738 } 739 740 static SlirpState *slirp_lookup(Monitor *mon, const char *id) 741 { 742 if (id) { 743 NetClientState *nc = qemu_find_netdev(id); 744 if (!nc) { 745 monitor_printf(mon, "unrecognized netdev id '%s'\n", id); 746 return NULL; 747 } 748 if (strcmp(nc->model, "user")) { 749 monitor_printf(mon, "invalid device specified\n"); 750 return NULL; 751 } 752 return DO_UPCAST(SlirpState, nc, nc); 753 } else { 754 if (QTAILQ_EMPTY(&slirp_stacks)) { 755 monitor_printf(mon, "user mode network stack not in use\n"); 756 return NULL; 757 } 758 return QTAILQ_FIRST(&slirp_stacks); 759 } 760 } 761 762 void hmp_hostfwd_remove(Monitor *mon, const QDict *qdict) 763 { 764 struct in_addr host_addr = { .s_addr = INADDR_ANY }; 765 int host_port; 766 char buf[256]; 767 const char *src_str, *p; 768 SlirpState *s; 769 int is_udp = 0; 770 int err; 771 const char *arg1 = qdict_get_str(qdict, "arg1"); 772 const char *arg2 = qdict_get_try_str(qdict, "arg2"); 773 774 if (arg2) { 775 s = slirp_lookup(mon, arg1); 776 src_str = arg2; 777 } else { 778 s = slirp_lookup(mon, NULL); 779 src_str = arg1; 780 } 781 if (!s) { 782 return; 783 } 784 785 p = src_str; 786 if (!p || get_str_sep(buf, sizeof(buf), &p, ':') < 0) { 787 goto fail_syntax; 788 } 789 790 if (!strcmp(buf, "tcp") || buf[0] == '\0') { 791 is_udp = 0; 792 } else if (!strcmp(buf, "udp")) { 793 is_udp = 1; 794 } else { 795 goto fail_syntax; 796 } 797 798 if (get_str_sep(buf, sizeof(buf), &p, ':') < 0) { 799 goto fail_syntax; 800 } 801 if (buf[0] != '\0' && !inet_aton(buf, &host_addr)) { 802 goto fail_syntax; 803 } 804 805 if (qemu_strtoi(p, NULL, 10, &host_port)) { 806 goto fail_syntax; 807 } 808 809 err = slirp_remove_hostfwd(s->slirp, is_udp, host_addr, host_port); 810 811 monitor_printf(mon, "host forwarding rule for %s %s\n", src_str, 812 err ? "not found" : "removed"); 813 return; 814 815 fail_syntax: 816 monitor_printf(mon, "invalid format\n"); 817 } 818 819 static int slirp_hostfwd(SlirpState *s, const char *redir_str, Error **errp) 820 { 821 struct in_addr host_addr = { .s_addr = INADDR_ANY }; 822 struct in_addr guest_addr = { .s_addr = 0 }; 823 int host_port, guest_port; 824 const char *p; 825 char buf[256]; 826 int is_udp; 827 char *end; 828 const char *fail_reason = "Unknown reason"; 829 830 p = redir_str; 831 if (!p || get_str_sep(buf, sizeof(buf), &p, ':') < 0) { 832 fail_reason = "No : separators"; 833 goto fail_syntax; 834 } 835 if (!strcmp(buf, "tcp") || buf[0] == '\0') { 836 is_udp = 0; 837 } else if (!strcmp(buf, "udp")) { 838 is_udp = 1; 839 } else { 840 fail_reason = "Bad protocol name"; 841 goto fail_syntax; 842 } 843 844 if (get_str_sep(buf, sizeof(buf), &p, ':') < 0) { 845 fail_reason = "Missing : separator"; 846 goto fail_syntax; 847 } 848 if (buf[0] != '\0' && !inet_aton(buf, &host_addr)) { 849 fail_reason = "Bad host address"; 850 goto fail_syntax; 851 } 852 853 if (get_str_sep(buf, sizeof(buf), &p, '-') < 0) { 854 fail_reason = "Bad host port separator"; 855 goto fail_syntax; 856 } 857 host_port = strtol(buf, &end, 0); 858 if (*end != '\0' || host_port < 0 || host_port > 65535) { 859 fail_reason = "Bad host port"; 860 goto fail_syntax; 861 } 862 863 if (get_str_sep(buf, sizeof(buf), &p, ':') < 0) { 864 fail_reason = "Missing guest address"; 865 goto fail_syntax; 866 } 867 if (buf[0] != '\0' && !inet_aton(buf, &guest_addr)) { 868 fail_reason = "Bad guest address"; 869 goto fail_syntax; 870 } 871 872 guest_port = strtol(p, &end, 0); 873 if (*end != '\0' || guest_port < 1 || guest_port > 65535) { 874 fail_reason = "Bad guest port"; 875 goto fail_syntax; 876 } 877 878 if (slirp_add_hostfwd(s->slirp, is_udp, host_addr, host_port, guest_addr, 879 guest_port) < 0) { 880 error_setg(errp, "Could not set up host forwarding rule '%s'", 881 redir_str); 882 return -1; 883 } 884 return 0; 885 886 fail_syntax: 887 error_setg(errp, "Invalid host forwarding rule '%s' (%s)", redir_str, 888 fail_reason); 889 return -1; 890 } 891 892 void hmp_hostfwd_add(Monitor *mon, const QDict *qdict) 893 { 894 const char *redir_str; 895 SlirpState *s; 896 const char *arg1 = qdict_get_str(qdict, "arg1"); 897 const char *arg2 = qdict_get_try_str(qdict, "arg2"); 898 899 if (arg2) { 900 s = slirp_lookup(mon, arg1); 901 redir_str = arg2; 902 } else { 903 s = slirp_lookup(mon, NULL); 904 redir_str = arg1; 905 } 906 if (s) { 907 Error *err = NULL; 908 if (slirp_hostfwd(s, redir_str, &err) < 0) { 909 error_report_err(err); 910 } 911 } 912 913 } 914 915 #ifndef _WIN32 916 917 /* automatic user mode samba server configuration */ 918 static void slirp_smb_cleanup(SlirpState *s) 919 { 920 int ret; 921 922 if (s->smb_dir) { 923 gchar *cmd = g_strdup_printf("rm -rf %s", s->smb_dir); 924 ret = system(cmd); 925 if (ret == -1 || !WIFEXITED(ret)) { 926 error_report("'%s' failed.", cmd); 927 } else if (WEXITSTATUS(ret)) { 928 error_report("'%s' failed. Error code: %d", 929 cmd, WEXITSTATUS(ret)); 930 } 931 g_free(cmd); 932 g_free(s->smb_dir); 933 s->smb_dir = NULL; 934 } 935 } 936 937 static int slirp_smb(SlirpState* s, const char *exported_dir, 938 struct in_addr vserver_addr, Error **errp) 939 { 940 char *smb_conf; 941 char *smb_cmdline; 942 struct passwd *passwd; 943 FILE *f; 944 945 passwd = getpwuid(geteuid()); 946 if (!passwd) { 947 error_setg(errp, "Failed to retrieve user name"); 948 return -1; 949 } 950 951 if (access(CONFIG_SMBD_COMMAND, F_OK)) { 952 error_setg(errp, "Could not find '%s', please install it", 953 CONFIG_SMBD_COMMAND); 954 return -1; 955 } 956 957 if (access(exported_dir, R_OK | X_OK)) { 958 error_setg(errp, "Error accessing shared directory '%s': %s", 959 exported_dir, strerror(errno)); 960 return -1; 961 } 962 963 s->smb_dir = g_dir_make_tmp("qemu-smb.XXXXXX", NULL); 964 if (!s->smb_dir) { 965 error_setg(errp, "Could not create samba server dir"); 966 return -1; 967 } 968 smb_conf = g_strdup_printf("%s/%s", s->smb_dir, "smb.conf"); 969 970 f = fopen(smb_conf, "w"); 971 if (!f) { 972 slirp_smb_cleanup(s); 973 error_setg(errp, 974 "Could not create samba server configuration file '%s'", 975 smb_conf); 976 g_free(smb_conf); 977 return -1; 978 } 979 fprintf(f, 980 "[global]\n" 981 "private dir=%s\n" 982 "interfaces=127.0.0.1\n" 983 "bind interfaces only=yes\n" 984 "pid directory=%s\n" 985 "lock directory=%s\n" 986 "state directory=%s\n" 987 "cache directory=%s\n" 988 "ncalrpc dir=%s/ncalrpc\n" 989 "log file=%s/log.smbd\n" 990 "smb passwd file=%s/smbpasswd\n" 991 "security = user\n" 992 "map to guest = Bad User\n" 993 "load printers = no\n" 994 "printing = bsd\n" 995 "disable spoolss = yes\n" 996 "usershare max shares = 0\n" 997 "[qemu]\n" 998 "path=%s\n" 999 "read only=no\n" 1000 "guest ok=yes\n" 1001 "force user=%s\n", 1002 s->smb_dir, 1003 s->smb_dir, 1004 s->smb_dir, 1005 s->smb_dir, 1006 s->smb_dir, 1007 s->smb_dir, 1008 s->smb_dir, 1009 s->smb_dir, 1010 exported_dir, 1011 passwd->pw_name 1012 ); 1013 fclose(f); 1014 1015 smb_cmdline = g_strdup_printf("%s -l %s -s %s", 1016 CONFIG_SMBD_COMMAND, s->smb_dir, smb_conf); 1017 g_free(smb_conf); 1018 1019 if (slirp_add_exec(s->slirp, smb_cmdline, &vserver_addr, 139) < 0 || 1020 slirp_add_exec(s->slirp, smb_cmdline, &vserver_addr, 445) < 0) { 1021 slirp_smb_cleanup(s); 1022 g_free(smb_cmdline); 1023 error_setg(errp, "Conflicting/invalid smbserver address"); 1024 return -1; 1025 } 1026 g_free(smb_cmdline); 1027 return 0; 1028 } 1029 1030 #endif /* !defined(_WIN32) */ 1031 1032 static int guestfwd_can_read(void *opaque) 1033 { 1034 struct GuestFwd *fwd = opaque; 1035 return slirp_socket_can_recv(fwd->slirp, fwd->server, fwd->port); 1036 } 1037 1038 static void guestfwd_read(void *opaque, const uint8_t *buf, int size) 1039 { 1040 struct GuestFwd *fwd = opaque; 1041 slirp_socket_recv(fwd->slirp, fwd->server, fwd->port, buf, size); 1042 } 1043 1044 static ssize_t guestfwd_write(const void *buf, size_t len, void *chr) 1045 { 1046 return qemu_chr_fe_write_all(chr, buf, len); 1047 } 1048 1049 static int slirp_guestfwd(SlirpState *s, const char *config_str, Error **errp) 1050 { 1051 /* TODO: IPv6 */ 1052 struct in_addr server = { .s_addr = 0 }; 1053 struct GuestFwd *fwd; 1054 const char *p; 1055 char buf[128]; 1056 char *end; 1057 int port; 1058 1059 p = config_str; 1060 if (get_str_sep(buf, sizeof(buf), &p, ':') < 0) { 1061 goto fail_syntax; 1062 } 1063 if (strcmp(buf, "tcp") && buf[0] != '\0') { 1064 goto fail_syntax; 1065 } 1066 if (get_str_sep(buf, sizeof(buf), &p, ':') < 0) { 1067 goto fail_syntax; 1068 } 1069 if (buf[0] != '\0' && !inet_aton(buf, &server)) { 1070 goto fail_syntax; 1071 } 1072 if (get_str_sep(buf, sizeof(buf), &p, '-') < 0) { 1073 goto fail_syntax; 1074 } 1075 port = strtol(buf, &end, 10); 1076 if (*end != '\0' || port < 1 || port > 65535) { 1077 goto fail_syntax; 1078 } 1079 1080 snprintf(buf, sizeof(buf), "guestfwd.tcp.%d", port); 1081 1082 if (g_str_has_prefix(p, "cmd:")) { 1083 if (slirp_add_exec(s->slirp, &p[4], &server, port) < 0) { 1084 error_setg(errp, "Conflicting/invalid host:port in guest " 1085 "forwarding rule '%s'", config_str); 1086 return -1; 1087 } 1088 } else { 1089 Error *err = NULL; 1090 /* 1091 * FIXME: sure we want to support implicit 1092 * muxed monitors here? 1093 */ 1094 Chardev *chr = qemu_chr_new_mux_mon(buf, p, NULL); 1095 1096 if (!chr) { 1097 error_setg(errp, "Could not open guest forwarding device '%s'", 1098 buf); 1099 return -1; 1100 } 1101 1102 fwd = g_new(struct GuestFwd, 1); 1103 qemu_chr_fe_init(&fwd->hd, chr, &err); 1104 if (err) { 1105 error_propagate(errp, err); 1106 object_unparent(OBJECT(chr)); 1107 g_free(fwd); 1108 return -1; 1109 } 1110 1111 if (slirp_add_guestfwd(s->slirp, guestfwd_write, &fwd->hd, 1112 &server, port) < 0) { 1113 error_setg(errp, "Conflicting/invalid host:port in guest " 1114 "forwarding rule '%s'", config_str); 1115 qemu_chr_fe_deinit(&fwd->hd, true); 1116 g_free(fwd); 1117 return -1; 1118 } 1119 fwd->server = server; 1120 fwd->port = port; 1121 fwd->slirp = s->slirp; 1122 1123 qemu_chr_fe_set_handlers(&fwd->hd, guestfwd_can_read, guestfwd_read, 1124 NULL, NULL, fwd, NULL, true); 1125 s->fwd = g_slist_append(s->fwd, fwd); 1126 } 1127 return 0; 1128 1129 fail_syntax: 1130 error_setg(errp, "Invalid guest forwarding rule '%s'", config_str); 1131 return -1; 1132 } 1133 1134 void hmp_info_usernet(Monitor *mon, const QDict *qdict) 1135 { 1136 SlirpState *s; 1137 1138 QTAILQ_FOREACH(s, &slirp_stacks, entry) { 1139 int id; 1140 bool got_hub_id = net_hub_id_for_client(&s->nc, &id) == 0; 1141 char *info = slirp_connection_info(s->slirp); 1142 monitor_printf(mon, "Hub %d (%s):\n%s", 1143 got_hub_id ? id : -1, 1144 s->nc.name, info); 1145 g_free(info); 1146 } 1147 } 1148 1149 static void 1150 net_init_slirp_configs(const StringList *fwd, int flags) 1151 { 1152 while (fwd) { 1153 struct slirp_config_str *config; 1154 1155 config = g_malloc0(sizeof(*config)); 1156 pstrcpy(config->str, sizeof(config->str), fwd->value->str); 1157 config->flags = flags; 1158 config->next = slirp_configs; 1159 slirp_configs = config; 1160 1161 fwd = fwd->next; 1162 } 1163 } 1164 1165 static const char **slirp_dnssearch(const StringList *dnsname) 1166 { 1167 const StringList *c = dnsname; 1168 size_t i = 0, num_opts = 0; 1169 const char **ret; 1170 1171 while (c) { 1172 num_opts++; 1173 c = c->next; 1174 } 1175 1176 if (num_opts == 0) { 1177 return NULL; 1178 } 1179 1180 ret = g_malloc((num_opts + 1) * sizeof(*ret)); 1181 c = dnsname; 1182 while (c) { 1183 ret[i++] = c->value->str; 1184 c = c->next; 1185 } 1186 ret[i] = NULL; 1187 return ret; 1188 } 1189 1190 int net_init_slirp(const Netdev *netdev, const char *name, 1191 NetClientState *peer, Error **errp) 1192 { 1193 struct slirp_config_str *config; 1194 char *vnet; 1195 int ret; 1196 const NetdevUserOptions *user; 1197 const char **dnssearch; 1198 bool ipv4 = true, ipv6 = true; 1199 1200 assert(netdev->type == NET_CLIENT_DRIVER_USER); 1201 user = &netdev->u.user; 1202 1203 if ((user->has_ipv6 && user->ipv6 && !user->has_ipv4) || 1204 (user->has_ipv4 && !user->ipv4)) { 1205 ipv4 = 0; 1206 } 1207 if ((user->has_ipv4 && user->ipv4 && !user->has_ipv6) || 1208 (user->has_ipv6 && !user->ipv6)) { 1209 ipv6 = 0; 1210 } 1211 1212 vnet = user->has_net ? g_strdup(user->net) : 1213 user->has_ip ? g_strdup_printf("%s/24", user->ip) : 1214 NULL; 1215 1216 dnssearch = slirp_dnssearch(user->dnssearch); 1217 1218 /* all optional fields are initialized to "all bits zero" */ 1219 1220 net_init_slirp_configs(user->hostfwd, SLIRP_CFG_HOSTFWD); 1221 net_init_slirp_configs(user->guestfwd, 0); 1222 1223 ret = net_slirp_init(peer, "user", name, user->q_restrict, 1224 ipv4, vnet, user->host, 1225 ipv6, user->ipv6_prefix, user->ipv6_prefixlen, 1226 user->ipv6_host, user->hostname, user->tftp, 1227 user->bootfile, user->dhcpstart, 1228 user->dns, user->ipv6_dns, user->smb, 1229 user->smbserver, dnssearch, user->domainname, 1230 user->tftp_server_name, errp); 1231 1232 while (slirp_configs) { 1233 config = slirp_configs; 1234 slirp_configs = config->next; 1235 g_free(config); 1236 } 1237 1238 g_free(vnet); 1239 g_free(dnssearch); 1240 1241 return ret; 1242 } 1243