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