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 #if defined(CONFIG_SMBD_COMMAND) 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/vmstate.h" 50 #include "migration/qemu-file-types.h" 51 52 static int get_str_sep(char *buf, int buf_size, const char **pp, int sep) 53 { 54 const char *p, *p1; 55 int len; 56 p = *pp; 57 p1 = strchr(p, sep); 58 if (!p1) 59 return -1; 60 len = p1 - p; 61 p1++; 62 if (buf_size > 0) { 63 if (len > buf_size - 1) 64 len = buf_size - 1; 65 memcpy(buf, p, len); 66 buf[len] = '\0'; 67 } 68 *pp = p1; 69 return 0; 70 } 71 72 /* slirp network adapter */ 73 74 #define SLIRP_CFG_HOSTFWD 1 75 76 struct slirp_config_str { 77 struct slirp_config_str *next; 78 int flags; 79 char str[1024]; 80 }; 81 82 struct GuestFwd { 83 CharBackend hd; 84 struct in_addr server; 85 int port; 86 Slirp *slirp; 87 }; 88 89 typedef struct SlirpState { 90 NetClientState nc; 91 QTAILQ_ENTRY(SlirpState) entry; 92 Slirp *slirp; 93 Notifier poll_notifier; 94 Notifier exit_notifier; 95 #if defined(CONFIG_SMBD_COMMAND) 96 gchar *smb_dir; 97 #endif 98 GSList *fwd; 99 } SlirpState; 100 101 static struct slirp_config_str *slirp_configs; 102 static QTAILQ_HEAD(, SlirpState) slirp_stacks = 103 QTAILQ_HEAD_INITIALIZER(slirp_stacks); 104 105 static int slirp_hostfwd(SlirpState *s, const char *redir_str, Error **errp); 106 static int slirp_guestfwd(SlirpState *s, const char *config_str, Error **errp); 107 108 #if defined(CONFIG_SMBD_COMMAND) 109 static int slirp_smb(SlirpState *s, const char *exported_dir, 110 struct in_addr vserver_addr, Error **errp); 111 static void slirp_smb_cleanup(SlirpState *s); 112 #else 113 static inline void slirp_smb_cleanup(SlirpState *s) { } 114 #endif 115 116 static ssize_t net_slirp_send_packet(const void *pkt, size_t pkt_len, 117 void *opaque) 118 { 119 SlirpState *s = opaque; 120 uint8_t min_pkt[ETH_ZLEN]; 121 size_t min_pktsz = sizeof(min_pkt); 122 123 if (net_peer_needs_padding(&s->nc)) { 124 if (eth_pad_short_frame(min_pkt, &min_pktsz, pkt, pkt_len)) { 125 pkt = min_pkt; 126 pkt_len = min_pktsz; 127 } 128 } 129 130 return qemu_send_packet(&s->nc, pkt, pkt_len); 131 } 132 133 static ssize_t net_slirp_receive(NetClientState *nc, const uint8_t *buf, size_t size) 134 { 135 SlirpState *s = DO_UPCAST(SlirpState, nc, nc); 136 137 slirp_input(s->slirp, buf, size); 138 139 return size; 140 } 141 142 static void slirp_smb_exit(Notifier *n, void *data) 143 { 144 SlirpState *s = container_of(n, SlirpState, exit_notifier); 145 slirp_smb_cleanup(s); 146 } 147 148 static void slirp_free_fwd(gpointer data) 149 { 150 struct GuestFwd *fwd = data; 151 152 qemu_chr_fe_deinit(&fwd->hd, true); 153 g_free(data); 154 } 155 156 static void net_slirp_cleanup(NetClientState *nc) 157 { 158 SlirpState *s = DO_UPCAST(SlirpState, nc, nc); 159 160 g_slist_free_full(s->fwd, slirp_free_fwd); 161 main_loop_poll_remove_notifier(&s->poll_notifier); 162 unregister_savevm(NULL, "slirp", s->slirp); 163 slirp_cleanup(s->slirp); 164 if (s->exit_notifier.notify) { 165 qemu_remove_exit_notifier(&s->exit_notifier); 166 } 167 slirp_smb_cleanup(s); 168 QTAILQ_REMOVE(&slirp_stacks, s, entry); 169 } 170 171 static NetClientInfo net_slirp_info = { 172 .type = NET_CLIENT_DRIVER_USER, 173 .size = sizeof(SlirpState), 174 .receive = net_slirp_receive, 175 .cleanup = net_slirp_cleanup, 176 }; 177 178 static void net_slirp_guest_error(const char *msg, void *opaque) 179 { 180 qemu_log_mask(LOG_GUEST_ERROR, "%s", msg); 181 } 182 183 static int64_t net_slirp_clock_get_ns(void *opaque) 184 { 185 return qemu_clock_get_ns(QEMU_CLOCK_VIRTUAL); 186 } 187 188 typedef struct SlirpTimer SlirpTimer; 189 struct SlirpTimer { 190 QEMUTimer timer; 191 #if SLIRP_CHECK_VERSION(4,7,0) 192 Slirp *slirp; 193 SlirpTimerId id; 194 void *cb_opaque; 195 #endif 196 }; 197 198 #if SLIRP_CHECK_VERSION(4,7,0) 199 static void net_slirp_init_completed(Slirp *slirp, void *opaque) 200 { 201 SlirpState *s = opaque; 202 s->slirp = slirp; 203 } 204 205 static void net_slirp_timer_cb(void *opaque) 206 { 207 SlirpTimer *t = opaque; 208 slirp_handle_timer(t->slirp, t->id, t->cb_opaque); 209 } 210 211 static void *net_slirp_timer_new_opaque(SlirpTimerId id, 212 void *cb_opaque, void *opaque) 213 { 214 SlirpState *s = opaque; 215 SlirpTimer *t = g_new(SlirpTimer, 1); 216 t->slirp = s->slirp; 217 t->id = id; 218 t->cb_opaque = cb_opaque; 219 timer_init_full(&t->timer, NULL, QEMU_CLOCK_VIRTUAL, 220 SCALE_MS, QEMU_TIMER_ATTR_EXTERNAL, 221 net_slirp_timer_cb, t); 222 return t; 223 } 224 #else 225 static void *net_slirp_timer_new(SlirpTimerCb cb, 226 void *cb_opaque, void *opaque) 227 { 228 SlirpTimer *t = g_new(SlirpTimer, 1); 229 timer_init_full(&t->timer, NULL, QEMU_CLOCK_VIRTUAL, 230 SCALE_MS, QEMU_TIMER_ATTR_EXTERNAL, 231 cb, cb_opaque); 232 return t; 233 } 234 #endif 235 236 static void net_slirp_timer_free(void *timer, void *opaque) 237 { 238 SlirpTimer *t = timer; 239 timer_del(&t->timer); 240 g_free(t); 241 } 242 243 static void net_slirp_timer_mod(void *timer, int64_t expire_timer, 244 void *opaque) 245 { 246 SlirpTimer *t = timer; 247 timer_mod(&t->timer, expire_timer); 248 } 249 250 static void net_slirp_register_poll_fd(int fd, void *opaque) 251 { 252 #ifdef WIN32 253 AioContext *ctxt = qemu_get_aio_context(); 254 255 if (WSAEventSelect(fd, event_notifier_get_handle(&ctxt->notifier), 256 FD_READ | FD_ACCEPT | FD_CLOSE | 257 FD_CONNECT | FD_WRITE | FD_OOB) != 0) { 258 error_setg_win32(&error_warn, WSAGetLastError(), "failed to WSAEventSelect()"); 259 } 260 #endif 261 } 262 263 static void net_slirp_unregister_poll_fd(int fd, void *opaque) 264 { 265 #ifdef WIN32 266 if (WSAEventSelect(fd, NULL, 0) != 0) { 267 error_setg_win32(&error_warn, WSAGetLastError(), "failed to WSAEventSelect()"); 268 } 269 #endif 270 } 271 272 static void net_slirp_notify(void *opaque) 273 { 274 qemu_notify_event(); 275 } 276 277 static const SlirpCb slirp_cb = { 278 .send_packet = net_slirp_send_packet, 279 .guest_error = net_slirp_guest_error, 280 .clock_get_ns = net_slirp_clock_get_ns, 281 #if SLIRP_CHECK_VERSION(4,7,0) 282 .init_completed = net_slirp_init_completed, 283 .timer_new_opaque = net_slirp_timer_new_opaque, 284 #else 285 .timer_new = net_slirp_timer_new, 286 #endif 287 .timer_free = net_slirp_timer_free, 288 .timer_mod = net_slirp_timer_mod, 289 .register_poll_fd = net_slirp_register_poll_fd, 290 .unregister_poll_fd = net_slirp_unregister_poll_fd, 291 .notify = net_slirp_notify, 292 }; 293 294 static int slirp_poll_to_gio(int events) 295 { 296 int ret = 0; 297 298 if (events & SLIRP_POLL_IN) { 299 ret |= G_IO_IN; 300 } 301 if (events & SLIRP_POLL_OUT) { 302 ret |= G_IO_OUT; 303 } 304 if (events & SLIRP_POLL_PRI) { 305 ret |= G_IO_PRI; 306 } 307 if (events & SLIRP_POLL_ERR) { 308 ret |= G_IO_ERR; 309 } 310 if (events & SLIRP_POLL_HUP) { 311 ret |= G_IO_HUP; 312 } 313 314 return ret; 315 } 316 317 static int net_slirp_add_poll(int fd, int events, void *opaque) 318 { 319 GArray *pollfds = opaque; 320 GPollFD pfd = { 321 .fd = fd, 322 .events = slirp_poll_to_gio(events), 323 }; 324 int idx = pollfds->len; 325 g_array_append_val(pollfds, pfd); 326 return idx; 327 } 328 329 static int slirp_gio_to_poll(int events) 330 { 331 int ret = 0; 332 333 if (events & G_IO_IN) { 334 ret |= SLIRP_POLL_IN; 335 } 336 if (events & G_IO_OUT) { 337 ret |= SLIRP_POLL_OUT; 338 } 339 if (events & G_IO_PRI) { 340 ret |= SLIRP_POLL_PRI; 341 } 342 if (events & G_IO_ERR) { 343 ret |= SLIRP_POLL_ERR; 344 } 345 if (events & G_IO_HUP) { 346 ret |= SLIRP_POLL_HUP; 347 } 348 349 return ret; 350 } 351 352 static int net_slirp_get_revents(int idx, void *opaque) 353 { 354 GArray *pollfds = opaque; 355 356 return slirp_gio_to_poll(g_array_index(pollfds, GPollFD, idx).revents); 357 } 358 359 static void net_slirp_poll_notify(Notifier *notifier, void *data) 360 { 361 MainLoopPoll *poll = data; 362 SlirpState *s = container_of(notifier, SlirpState, poll_notifier); 363 364 switch (poll->state) { 365 case MAIN_LOOP_POLL_FILL: 366 slirp_pollfds_fill(s->slirp, &poll->timeout, 367 net_slirp_add_poll, poll->pollfds); 368 break; 369 case MAIN_LOOP_POLL_OK: 370 case MAIN_LOOP_POLL_ERR: 371 slirp_pollfds_poll(s->slirp, poll->state == MAIN_LOOP_POLL_ERR, 372 net_slirp_get_revents, poll->pollfds); 373 break; 374 default: 375 g_assert_not_reached(); 376 } 377 } 378 379 static ssize_t 380 net_slirp_stream_read(void *buf, size_t size, void *opaque) 381 { 382 QEMUFile *f = opaque; 383 384 return qemu_get_buffer(f, buf, size); 385 } 386 387 static ssize_t 388 net_slirp_stream_write(const void *buf, size_t size, void *opaque) 389 { 390 QEMUFile *f = opaque; 391 392 qemu_put_buffer(f, buf, size); 393 if (qemu_file_get_error(f)) { 394 return -1; 395 } 396 397 return size; 398 } 399 400 static int net_slirp_state_load(QEMUFile *f, void *opaque, int version_id) 401 { 402 Slirp *slirp = opaque; 403 404 return slirp_state_load(slirp, version_id, net_slirp_stream_read, f); 405 } 406 407 static void net_slirp_state_save(QEMUFile *f, void *opaque) 408 { 409 Slirp *slirp = opaque; 410 411 slirp_state_save(slirp, net_slirp_stream_write, f); 412 } 413 414 static SaveVMHandlers savevm_slirp_state = { 415 .save_state = net_slirp_state_save, 416 .load_state = net_slirp_state_load, 417 }; 418 419 static int net_slirp_init(NetClientState *peer, const char *model, 420 const char *name, int restricted, 421 bool ipv4, const char *vnetwork, const char *vhost, 422 bool ipv6, const char *vprefix6, int vprefix6_len, 423 const char *vhost6, 424 const char *vhostname, const char *tftp_export, 425 const char *bootfile, const char *vdhcp_start, 426 const char *vnameserver, const char *vnameserver6, 427 const char *smb_export, const char *vsmbserver, 428 const char **dnssearch, const char *vdomainname, 429 const char *tftp_server_name, 430 Error **errp) 431 { 432 /* default settings according to historic slirp */ 433 struct in_addr net = { .s_addr = htonl(0x0a000200) }; /* 10.0.2.0 */ 434 struct in_addr mask = { .s_addr = htonl(0xffffff00) }; /* 255.255.255.0 */ 435 struct in_addr host = { .s_addr = htonl(0x0a000202) }; /* 10.0.2.2 */ 436 struct in_addr dhcp = { .s_addr = htonl(0x0a00020f) }; /* 10.0.2.15 */ 437 struct in_addr dns = { .s_addr = htonl(0x0a000203) }; /* 10.0.2.3 */ 438 struct in6_addr ip6_prefix; 439 struct in6_addr ip6_host; 440 struct in6_addr ip6_dns; 441 #if defined(CONFIG_SMBD_COMMAND) 442 struct in_addr smbsrv = { .s_addr = 0 }; 443 #endif 444 SlirpConfig cfg = { 0 }; 445 NetClientState *nc; 446 SlirpState *s; 447 char buf[20]; 448 uint32_t addr; 449 int shift; 450 char *end; 451 struct slirp_config_str *config; 452 453 if (!ipv4 && (vnetwork || vhost || vnameserver)) { 454 error_setg(errp, "IPv4 disabled but netmask/host/dns provided"); 455 return -1; 456 } 457 458 if (!ipv6 && (vprefix6 || vhost6 || vnameserver6)) { 459 error_setg(errp, "IPv6 disabled but prefix/host6/dns6 provided"); 460 return -1; 461 } 462 463 if (!ipv4 && !ipv6) { 464 /* It doesn't make sense to disable both */ 465 error_setg(errp, "IPv4 and IPv6 disabled"); 466 return -1; 467 } 468 469 if (vnetwork) { 470 if (get_str_sep(buf, sizeof(buf), &vnetwork, '/') < 0) { 471 if (!inet_aton(vnetwork, &net)) { 472 error_setg(errp, "Failed to parse netmask"); 473 return -1; 474 } 475 addr = ntohl(net.s_addr); 476 if (!(addr & 0x80000000)) { 477 mask.s_addr = htonl(0xff000000); /* class A */ 478 } else if ((addr & 0xfff00000) == 0xac100000) { 479 mask.s_addr = htonl(0xfff00000); /* priv. 172.16.0.0/12 */ 480 } else if ((addr & 0xc0000000) == 0x80000000) { 481 mask.s_addr = htonl(0xffff0000); /* class B */ 482 } else if ((addr & 0xffff0000) == 0xc0a80000) { 483 mask.s_addr = htonl(0xffff0000); /* priv. 192.168.0.0/16 */ 484 } else if ((addr & 0xffff0000) == 0xc6120000) { 485 mask.s_addr = htonl(0xfffe0000); /* tests 198.18.0.0/15 */ 486 } else if ((addr & 0xe0000000) == 0xe0000000) { 487 mask.s_addr = htonl(0xffffff00); /* class C */ 488 } else { 489 mask.s_addr = htonl(0xfffffff0); /* multicast/reserved */ 490 } 491 } else { 492 if (!inet_aton(buf, &net)) { 493 error_setg(errp, "Failed to parse netmask"); 494 return -1; 495 } 496 shift = strtol(vnetwork, &end, 10); 497 if (*end != '\0') { 498 if (!inet_aton(vnetwork, &mask)) { 499 error_setg(errp, 500 "Failed to parse netmask (trailing chars)"); 501 return -1; 502 } 503 } else if (shift < 4 || shift > 32) { 504 error_setg(errp, 505 "Invalid netmask provided (must be in range 4-32)"); 506 return -1; 507 } else { 508 mask.s_addr = htonl(0xffffffff << (32 - shift)); 509 } 510 } 511 net.s_addr &= mask.s_addr; 512 host.s_addr = net.s_addr | (htonl(0x0202) & ~mask.s_addr); 513 dhcp.s_addr = net.s_addr | (htonl(0x020f) & ~mask.s_addr); 514 dns.s_addr = net.s_addr | (htonl(0x0203) & ~mask.s_addr); 515 } 516 517 if (vhost && !inet_aton(vhost, &host)) { 518 error_setg(errp, "Failed to parse host"); 519 return -1; 520 } 521 if ((host.s_addr & mask.s_addr) != net.s_addr) { 522 error_setg(errp, "Host doesn't belong to network"); 523 return -1; 524 } 525 526 if (vnameserver && !inet_aton(vnameserver, &dns)) { 527 error_setg(errp, "Failed to parse DNS"); 528 return -1; 529 } 530 if (restricted && (dns.s_addr & mask.s_addr) != net.s_addr) { 531 error_setg(errp, "DNS doesn't belong to network"); 532 return -1; 533 } 534 if (dns.s_addr == host.s_addr) { 535 error_setg(errp, "DNS must be different from host"); 536 return -1; 537 } 538 539 if (vdhcp_start && !inet_aton(vdhcp_start, &dhcp)) { 540 error_setg(errp, "Failed to parse DHCP start address"); 541 return -1; 542 } 543 if ((dhcp.s_addr & mask.s_addr) != net.s_addr) { 544 error_setg(errp, "DHCP doesn't belong to network"); 545 return -1; 546 } 547 if (dhcp.s_addr == host.s_addr || dhcp.s_addr == dns.s_addr) { 548 error_setg(errp, "DHCP must be different from host and DNS"); 549 return -1; 550 } 551 552 #if defined(CONFIG_SMBD_COMMAND) 553 if (vsmbserver && !inet_aton(vsmbserver, &smbsrv)) { 554 error_setg(errp, "Failed to parse SMB address"); 555 return -1; 556 } 557 #endif 558 559 if (!vprefix6) { 560 vprefix6 = "fec0::"; 561 } 562 if (!inet_pton(AF_INET6, vprefix6, &ip6_prefix)) { 563 error_setg(errp, "Failed to parse IPv6 prefix"); 564 return -1; 565 } 566 567 if (!vprefix6_len) { 568 vprefix6_len = 64; 569 } 570 if (vprefix6_len < 0 || vprefix6_len > 126) { 571 error_setg(errp, 572 "Invalid IPv6 prefix provided " 573 "(IPv6 prefix length must be between 0 and 126)"); 574 return -1; 575 } 576 577 if (vhost6) { 578 if (!inet_pton(AF_INET6, vhost6, &ip6_host)) { 579 error_setg(errp, "Failed to parse IPv6 host"); 580 return -1; 581 } 582 if (!in6_equal_net(&ip6_prefix, &ip6_host, vprefix6_len)) { 583 error_setg(errp, "IPv6 Host doesn't belong to network"); 584 return -1; 585 } 586 } else { 587 ip6_host = ip6_prefix; 588 ip6_host.s6_addr[15] |= 2; 589 } 590 591 if (vnameserver6) { 592 if (!inet_pton(AF_INET6, vnameserver6, &ip6_dns)) { 593 error_setg(errp, "Failed to parse IPv6 DNS"); 594 return -1; 595 } 596 if (restricted && !in6_equal_net(&ip6_prefix, &ip6_dns, vprefix6_len)) { 597 error_setg(errp, "IPv6 DNS doesn't belong to network"); 598 return -1; 599 } 600 } else { 601 ip6_dns = ip6_prefix; 602 ip6_dns.s6_addr[15] |= 3; 603 } 604 605 if (vdomainname && !*vdomainname) { 606 error_setg(errp, "'domainname' parameter cannot be empty"); 607 return -1; 608 } 609 610 if (vdomainname && strlen(vdomainname) > 255) { 611 error_setg(errp, "'domainname' parameter cannot exceed 255 bytes"); 612 return -1; 613 } 614 615 if (vhostname && strlen(vhostname) > 255) { 616 error_setg(errp, "'vhostname' parameter cannot exceed 255 bytes"); 617 return -1; 618 } 619 620 if (tftp_server_name && strlen(tftp_server_name) > 255) { 621 error_setg(errp, "'tftp-server-name' parameter cannot exceed 255 bytes"); 622 return -1; 623 } 624 625 nc = qemu_new_net_client(&net_slirp_info, peer, model, name); 626 627 qemu_set_info_str(nc, "net=%s,restrict=%s", inet_ntoa(net), 628 restricted ? "on" : "off"); 629 630 s = DO_UPCAST(SlirpState, nc, nc); 631 632 cfg.version = SLIRP_CHECK_VERSION(4,7,0) ? 4 : 1; 633 cfg.restricted = restricted; 634 cfg.in_enabled = ipv4; 635 cfg.vnetwork = net; 636 cfg.vnetmask = mask; 637 cfg.vhost = host; 638 cfg.in6_enabled = ipv6; 639 cfg.vprefix_addr6 = ip6_prefix; 640 cfg.vprefix_len = vprefix6_len; 641 cfg.vhost6 = ip6_host; 642 cfg.vhostname = vhostname; 643 cfg.tftp_server_name = tftp_server_name; 644 cfg.tftp_path = tftp_export; 645 cfg.bootfile = bootfile; 646 cfg.vdhcp_start = dhcp; 647 cfg.vnameserver = dns; 648 cfg.vnameserver6 = ip6_dns; 649 cfg.vdnssearch = dnssearch; 650 cfg.vdomainname = vdomainname; 651 s->slirp = slirp_new(&cfg, &slirp_cb, s); 652 QTAILQ_INSERT_TAIL(&slirp_stacks, s, entry); 653 654 /* 655 * Make sure the current bitstream version of slirp is 4, to avoid 656 * QEMU migration incompatibilities, if upstream slirp bumped the 657 * version. 658 * 659 * FIXME: use bitfields of features? teach libslirp to save with 660 * specific version? 661 */ 662 g_assert(slirp_state_version() == 4); 663 register_savevm_live("slirp", VMSTATE_INSTANCE_ID_ANY, 664 slirp_state_version(), &savevm_slirp_state, s->slirp); 665 666 s->poll_notifier.notify = net_slirp_poll_notify; 667 main_loop_poll_add_notifier(&s->poll_notifier); 668 669 for (config = slirp_configs; config; config = config->next) { 670 if (config->flags & SLIRP_CFG_HOSTFWD) { 671 if (slirp_hostfwd(s, config->str, errp) < 0) { 672 goto error; 673 } 674 } else { 675 if (slirp_guestfwd(s, config->str, errp) < 0) { 676 goto error; 677 } 678 } 679 } 680 #if defined(CONFIG_SMBD_COMMAND) 681 if (smb_export) { 682 if (slirp_smb(s, smb_export, smbsrv, errp) < 0) { 683 goto error; 684 } 685 } 686 #endif 687 688 s->exit_notifier.notify = slirp_smb_exit; 689 qemu_add_exit_notifier(&s->exit_notifier); 690 return 0; 691 692 error: 693 qemu_del_net_client(nc); 694 return -1; 695 } 696 697 static SlirpState *slirp_lookup(Monitor *mon, const char *id) 698 { 699 if (id) { 700 NetClientState *nc = qemu_find_netdev(id); 701 if (!nc) { 702 monitor_printf(mon, "unrecognized netdev id '%s'\n", id); 703 return NULL; 704 } 705 if (strcmp(nc->model, "user")) { 706 monitor_printf(mon, "invalid device specified\n"); 707 return NULL; 708 } 709 return DO_UPCAST(SlirpState, nc, nc); 710 } else { 711 if (QTAILQ_EMPTY(&slirp_stacks)) { 712 monitor_printf(mon, "user mode network stack not in use\n"); 713 return NULL; 714 } 715 return QTAILQ_FIRST(&slirp_stacks); 716 } 717 } 718 719 void hmp_hostfwd_remove(Monitor *mon, const QDict *qdict) 720 { 721 struct in_addr host_addr = { .s_addr = INADDR_ANY }; 722 int host_port; 723 char buf[256]; 724 const char *src_str, *p; 725 SlirpState *s; 726 int is_udp = 0; 727 int err; 728 const char *arg1 = qdict_get_str(qdict, "arg1"); 729 const char *arg2 = qdict_get_try_str(qdict, "arg2"); 730 731 if (arg2) { 732 s = slirp_lookup(mon, arg1); 733 src_str = arg2; 734 } else { 735 s = slirp_lookup(mon, NULL); 736 src_str = arg1; 737 } 738 if (!s) { 739 return; 740 } 741 742 p = src_str; 743 if (!p || get_str_sep(buf, sizeof(buf), &p, ':') < 0) { 744 goto fail_syntax; 745 } 746 747 if (!strcmp(buf, "tcp") || buf[0] == '\0') { 748 is_udp = 0; 749 } else if (!strcmp(buf, "udp")) { 750 is_udp = 1; 751 } else { 752 goto fail_syntax; 753 } 754 755 if (get_str_sep(buf, sizeof(buf), &p, ':') < 0) { 756 goto fail_syntax; 757 } 758 if (buf[0] != '\0' && !inet_aton(buf, &host_addr)) { 759 goto fail_syntax; 760 } 761 762 if (qemu_strtoi(p, NULL, 10, &host_port)) { 763 goto fail_syntax; 764 } 765 766 err = slirp_remove_hostfwd(s->slirp, is_udp, host_addr, host_port); 767 768 monitor_printf(mon, "host forwarding rule for %s %s\n", src_str, 769 err ? "not found" : "removed"); 770 return; 771 772 fail_syntax: 773 monitor_printf(mon, "invalid format\n"); 774 } 775 776 static int slirp_hostfwd(SlirpState *s, const char *redir_str, Error **errp) 777 { 778 struct in_addr host_addr = { .s_addr = INADDR_ANY }; 779 struct in_addr guest_addr = { .s_addr = 0 }; 780 int host_port, guest_port; 781 const char *p; 782 char buf[256]; 783 int is_udp; 784 char *end; 785 const char *fail_reason = "Unknown reason"; 786 787 p = redir_str; 788 if (!p || get_str_sep(buf, sizeof(buf), &p, ':') < 0) { 789 fail_reason = "No : separators"; 790 goto fail_syntax; 791 } 792 if (!strcmp(buf, "tcp") || buf[0] == '\0') { 793 is_udp = 0; 794 } else if (!strcmp(buf, "udp")) { 795 is_udp = 1; 796 } else { 797 fail_reason = "Bad protocol name"; 798 goto fail_syntax; 799 } 800 801 if (get_str_sep(buf, sizeof(buf), &p, ':') < 0) { 802 fail_reason = "Missing : separator"; 803 goto fail_syntax; 804 } 805 if (buf[0] != '\0' && !inet_aton(buf, &host_addr)) { 806 fail_reason = "Bad host address"; 807 goto fail_syntax; 808 } 809 810 if (get_str_sep(buf, sizeof(buf), &p, '-') < 0) { 811 fail_reason = "Bad host port separator"; 812 goto fail_syntax; 813 } 814 host_port = strtol(buf, &end, 0); 815 if (*end != '\0' || host_port < 0 || host_port > 65535) { 816 fail_reason = "Bad host port"; 817 goto fail_syntax; 818 } 819 820 if (get_str_sep(buf, sizeof(buf), &p, ':') < 0) { 821 fail_reason = "Missing guest address"; 822 goto fail_syntax; 823 } 824 if (buf[0] != '\0' && !inet_aton(buf, &guest_addr)) { 825 fail_reason = "Bad guest address"; 826 goto fail_syntax; 827 } 828 829 guest_port = strtol(p, &end, 0); 830 if (*end != '\0' || guest_port < 1 || guest_port > 65535) { 831 fail_reason = "Bad guest port"; 832 goto fail_syntax; 833 } 834 835 if (slirp_add_hostfwd(s->slirp, is_udp, host_addr, host_port, guest_addr, 836 guest_port) < 0) { 837 error_setg(errp, "Could not set up host forwarding rule '%s'", 838 redir_str); 839 return -1; 840 } 841 return 0; 842 843 fail_syntax: 844 error_setg(errp, "Invalid host forwarding rule '%s' (%s)", redir_str, 845 fail_reason); 846 return -1; 847 } 848 849 void hmp_hostfwd_add(Monitor *mon, const QDict *qdict) 850 { 851 const char *redir_str; 852 SlirpState *s; 853 const char *arg1 = qdict_get_str(qdict, "arg1"); 854 const char *arg2 = qdict_get_try_str(qdict, "arg2"); 855 856 if (arg2) { 857 s = slirp_lookup(mon, arg1); 858 redir_str = arg2; 859 } else { 860 s = slirp_lookup(mon, NULL); 861 redir_str = arg1; 862 } 863 if (s) { 864 Error *err = NULL; 865 if (slirp_hostfwd(s, redir_str, &err) < 0) { 866 error_report_err(err); 867 } 868 } 869 870 } 871 872 #if defined(CONFIG_SMBD_COMMAND) 873 874 /* automatic user mode samba server configuration */ 875 static void slirp_smb_cleanup(SlirpState *s) 876 { 877 int ret; 878 879 if (s->smb_dir) { 880 gchar *cmd = g_strdup_printf("rm -rf %s", s->smb_dir); 881 ret = system(cmd); 882 if (ret == -1 || !WIFEXITED(ret)) { 883 error_report("'%s' failed.", cmd); 884 } else if (WEXITSTATUS(ret)) { 885 error_report("'%s' failed. Error code: %d", 886 cmd, WEXITSTATUS(ret)); 887 } 888 g_free(cmd); 889 g_free(s->smb_dir); 890 s->smb_dir = NULL; 891 } 892 } 893 894 static int slirp_smb(SlirpState* s, const char *exported_dir, 895 struct in_addr vserver_addr, Error **errp) 896 { 897 char *smb_conf; 898 char *smb_cmdline; 899 struct passwd *passwd; 900 FILE *f; 901 902 passwd = getpwuid(geteuid()); 903 if (!passwd) { 904 error_setg(errp, "Failed to retrieve user name"); 905 return -1; 906 } 907 908 if (access(CONFIG_SMBD_COMMAND, F_OK)) { 909 error_setg(errp, "Could not find '%s', please install it", 910 CONFIG_SMBD_COMMAND); 911 return -1; 912 } 913 914 if (access(exported_dir, R_OK | X_OK)) { 915 error_setg(errp, "Error accessing shared directory '%s': %s", 916 exported_dir, strerror(errno)); 917 return -1; 918 } 919 920 s->smb_dir = g_dir_make_tmp("qemu-smb.XXXXXX", NULL); 921 if (!s->smb_dir) { 922 error_setg(errp, "Could not create samba server dir"); 923 return -1; 924 } 925 smb_conf = g_strdup_printf("%s/%s", s->smb_dir, "smb.conf"); 926 927 f = fopen(smb_conf, "w"); 928 if (!f) { 929 slirp_smb_cleanup(s); 930 error_setg(errp, 931 "Could not create samba server configuration file '%s'", 932 smb_conf); 933 g_free(smb_conf); 934 return -1; 935 } 936 fprintf(f, 937 "[global]\n" 938 "private dir=%s\n" 939 "interfaces=127.0.0.1\n" 940 "bind interfaces only=yes\n" 941 "pid directory=%s\n" 942 "lock directory=%s\n" 943 "state directory=%s\n" 944 "cache directory=%s\n" 945 "ncalrpc dir=%s/ncalrpc\n" 946 "log file=%s/log.smbd\n" 947 "smb passwd file=%s/smbpasswd\n" 948 "security = user\n" 949 "map to guest = Bad User\n" 950 "load printers = no\n" 951 "printing = bsd\n" 952 "disable spoolss = yes\n" 953 "usershare max shares = 0\n" 954 "[qemu]\n" 955 "path=%s\n" 956 "read only=no\n" 957 "guest ok=yes\n" 958 "force user=%s\n", 959 s->smb_dir, 960 s->smb_dir, 961 s->smb_dir, 962 s->smb_dir, 963 s->smb_dir, 964 s->smb_dir, 965 s->smb_dir, 966 s->smb_dir, 967 exported_dir, 968 passwd->pw_name 969 ); 970 fclose(f); 971 972 smb_cmdline = g_strdup_printf("%s -l %s -s %s", 973 CONFIG_SMBD_COMMAND, s->smb_dir, smb_conf); 974 g_free(smb_conf); 975 976 if (slirp_add_exec(s->slirp, smb_cmdline, &vserver_addr, 139) < 0 || 977 slirp_add_exec(s->slirp, smb_cmdline, &vserver_addr, 445) < 0) { 978 slirp_smb_cleanup(s); 979 g_free(smb_cmdline); 980 error_setg(errp, "Conflicting/invalid smbserver address"); 981 return -1; 982 } 983 g_free(smb_cmdline); 984 return 0; 985 } 986 987 #endif /* defined(CONFIG_SMBD_COMMAND) */ 988 989 static int guestfwd_can_read(void *opaque) 990 { 991 struct GuestFwd *fwd = opaque; 992 return slirp_socket_can_recv(fwd->slirp, fwd->server, fwd->port); 993 } 994 995 static void guestfwd_read(void *opaque, const uint8_t *buf, int size) 996 { 997 struct GuestFwd *fwd = opaque; 998 slirp_socket_recv(fwd->slirp, fwd->server, fwd->port, buf, size); 999 } 1000 1001 static ssize_t guestfwd_write(const void *buf, size_t len, void *chr) 1002 { 1003 return qemu_chr_fe_write_all(chr, buf, len); 1004 } 1005 1006 static int slirp_guestfwd(SlirpState *s, const char *config_str, Error **errp) 1007 { 1008 /* TODO: IPv6 */ 1009 struct in_addr server = { .s_addr = 0 }; 1010 struct GuestFwd *fwd; 1011 const char *p; 1012 char buf[128]; 1013 char *end; 1014 int port; 1015 1016 p = config_str; 1017 if (get_str_sep(buf, sizeof(buf), &p, ':') < 0) { 1018 goto fail_syntax; 1019 } 1020 if (strcmp(buf, "tcp") && buf[0] != '\0') { 1021 goto fail_syntax; 1022 } 1023 if (get_str_sep(buf, sizeof(buf), &p, ':') < 0) { 1024 goto fail_syntax; 1025 } 1026 if (buf[0] != '\0' && !inet_aton(buf, &server)) { 1027 goto fail_syntax; 1028 } 1029 if (get_str_sep(buf, sizeof(buf), &p, '-') < 0) { 1030 goto fail_syntax; 1031 } 1032 port = strtol(buf, &end, 10); 1033 if (*end != '\0' || port < 1 || port > 65535) { 1034 goto fail_syntax; 1035 } 1036 1037 snprintf(buf, sizeof(buf), "guestfwd.tcp.%d", port); 1038 1039 if (g_str_has_prefix(p, "cmd:")) { 1040 if (slirp_add_exec(s->slirp, &p[4], &server, port) < 0) { 1041 error_setg(errp, "Conflicting/invalid host:port in guest " 1042 "forwarding rule '%s'", config_str); 1043 return -1; 1044 } 1045 } else { 1046 Error *err = NULL; 1047 /* 1048 * FIXME: sure we want to support implicit 1049 * muxed monitors here? 1050 */ 1051 Chardev *chr = qemu_chr_new_mux_mon(buf, p, NULL); 1052 1053 if (!chr) { 1054 error_setg(errp, "Could not open guest forwarding device '%s'", 1055 buf); 1056 return -1; 1057 } 1058 1059 fwd = g_new(struct GuestFwd, 1); 1060 qemu_chr_fe_init(&fwd->hd, chr, &err); 1061 if (err) { 1062 error_propagate(errp, err); 1063 object_unparent(OBJECT(chr)); 1064 g_free(fwd); 1065 return -1; 1066 } 1067 1068 if (slirp_add_guestfwd(s->slirp, guestfwd_write, &fwd->hd, 1069 &server, port) < 0) { 1070 error_setg(errp, "Conflicting/invalid host:port in guest " 1071 "forwarding rule '%s'", config_str); 1072 qemu_chr_fe_deinit(&fwd->hd, true); 1073 g_free(fwd); 1074 return -1; 1075 } 1076 fwd->server = server; 1077 fwd->port = port; 1078 fwd->slirp = s->slirp; 1079 1080 qemu_chr_fe_set_handlers(&fwd->hd, guestfwd_can_read, guestfwd_read, 1081 NULL, NULL, fwd, NULL, true); 1082 s->fwd = g_slist_append(s->fwd, fwd); 1083 } 1084 return 0; 1085 1086 fail_syntax: 1087 error_setg(errp, "Invalid guest forwarding rule '%s'", config_str); 1088 return -1; 1089 } 1090 1091 void hmp_info_usernet(Monitor *mon, const QDict *qdict) 1092 { 1093 SlirpState *s; 1094 1095 QTAILQ_FOREACH(s, &slirp_stacks, entry) { 1096 int id; 1097 bool got_hub_id = net_hub_id_for_client(&s->nc, &id) == 0; 1098 char *info = slirp_connection_info(s->slirp); 1099 monitor_printf(mon, "Hub %d (%s):\n%s", 1100 got_hub_id ? id : -1, 1101 s->nc.name, info); 1102 g_free(info); 1103 } 1104 } 1105 1106 static void 1107 net_init_slirp_configs(const StringList *fwd, int flags) 1108 { 1109 while (fwd) { 1110 struct slirp_config_str *config; 1111 1112 config = g_malloc0(sizeof(*config)); 1113 pstrcpy(config->str, sizeof(config->str), fwd->value->str); 1114 config->flags = flags; 1115 config->next = slirp_configs; 1116 slirp_configs = config; 1117 1118 fwd = fwd->next; 1119 } 1120 } 1121 1122 static const char **slirp_dnssearch(const StringList *dnsname) 1123 { 1124 const StringList *c = dnsname; 1125 size_t i = 0, num_opts = 0; 1126 const char **ret; 1127 1128 while (c) { 1129 num_opts++; 1130 c = c->next; 1131 } 1132 1133 if (num_opts == 0) { 1134 return NULL; 1135 } 1136 1137 ret = g_malloc((num_opts + 1) * sizeof(*ret)); 1138 c = dnsname; 1139 while (c) { 1140 ret[i++] = c->value->str; 1141 c = c->next; 1142 } 1143 ret[i] = NULL; 1144 return ret; 1145 } 1146 1147 int net_init_slirp(const Netdev *netdev, const char *name, 1148 NetClientState *peer, Error **errp) 1149 { 1150 struct slirp_config_str *config; 1151 char *vnet; 1152 int ret; 1153 const NetdevUserOptions *user; 1154 const char **dnssearch; 1155 bool ipv4 = true, ipv6 = true; 1156 1157 assert(netdev->type == NET_CLIENT_DRIVER_USER); 1158 user = &netdev->u.user; 1159 1160 if ((user->has_ipv6 && user->ipv6 && !user->has_ipv4) || 1161 (user->has_ipv4 && !user->ipv4)) { 1162 ipv4 = 0; 1163 } 1164 if ((user->has_ipv4 && user->ipv4 && !user->has_ipv6) || 1165 (user->has_ipv6 && !user->ipv6)) { 1166 ipv6 = 0; 1167 } 1168 1169 vnet = user->net ? g_strdup(user->net) : 1170 user->ip ? g_strdup_printf("%s/24", user->ip) : 1171 NULL; 1172 1173 dnssearch = slirp_dnssearch(user->dnssearch); 1174 1175 /* all optional fields are initialized to "all bits zero" */ 1176 1177 net_init_slirp_configs(user->hostfwd, SLIRP_CFG_HOSTFWD); 1178 net_init_slirp_configs(user->guestfwd, 0); 1179 1180 ret = net_slirp_init(peer, "user", name, user->q_restrict, 1181 ipv4, vnet, user->host, 1182 ipv6, user->ipv6_prefix, user->ipv6_prefixlen, 1183 user->ipv6_host, user->hostname, user->tftp, 1184 user->bootfile, user->dhcpstart, 1185 user->dns, user->ipv6_dns, user->smb, 1186 user->smbserver, dnssearch, user->domainname, 1187 user->tftp_server_name, errp); 1188 1189 while (slirp_configs) { 1190 config = slirp_configs; 1191 slirp_configs = config->next; 1192 g_free(config); 1193 } 1194 1195 g_free(vnet); 1196 g_free(dnssearch); 1197 1198 return ret; 1199 } 1200