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; 380 381 if (!ipv4 && (vnetwork || vhost || vnameserver)) { 382 error_setg(errp, "IPv4 disabled but netmask/host/dns provided"); 383 return -1; 384 } 385 386 if (!ipv6 && (vprefix6 || vhost6 || vnameserver6)) { 387 error_setg(errp, "IPv6 disabled but prefix/host6/dns6 provided"); 388 return -1; 389 } 390 391 if (!ipv4 && !ipv6) { 392 /* It doesn't make sense to disable both */ 393 error_setg(errp, "IPv4 and IPv6 disabled"); 394 return -1; 395 } 396 397 if (vnetwork) { 398 if (get_str_sep(buf, sizeof(buf), &vnetwork, '/') < 0) { 399 if (!inet_aton(vnetwork, &net)) { 400 error_setg(errp, "Failed to parse netmask"); 401 return -1; 402 } 403 addr = ntohl(net.s_addr); 404 if (!(addr & 0x80000000)) { 405 mask.s_addr = htonl(0xff000000); /* class A */ 406 } else if ((addr & 0xfff00000) == 0xac100000) { 407 mask.s_addr = htonl(0xfff00000); /* priv. 172.16.0.0/12 */ 408 } else if ((addr & 0xc0000000) == 0x80000000) { 409 mask.s_addr = htonl(0xffff0000); /* class B */ 410 } else if ((addr & 0xffff0000) == 0xc0a80000) { 411 mask.s_addr = htonl(0xffff0000); /* priv. 192.168.0.0/16 */ 412 } else if ((addr & 0xffff0000) == 0xc6120000) { 413 mask.s_addr = htonl(0xfffe0000); /* tests 198.18.0.0/15 */ 414 } else if ((addr & 0xe0000000) == 0xe0000000) { 415 mask.s_addr = htonl(0xffffff00); /* class C */ 416 } else { 417 mask.s_addr = htonl(0xfffffff0); /* multicast/reserved */ 418 } 419 } else { 420 if (!inet_aton(buf, &net)) { 421 error_setg(errp, "Failed to parse netmask"); 422 return -1; 423 } 424 shift = strtol(vnetwork, &end, 10); 425 if (*end != '\0') { 426 if (!inet_aton(vnetwork, &mask)) { 427 error_setg(errp, 428 "Failed to parse netmask (trailing chars)"); 429 return -1; 430 } 431 } else if (shift < 4 || shift > 32) { 432 error_setg(errp, 433 "Invalid netmask provided (must be in range 4-32)"); 434 return -1; 435 } else { 436 mask.s_addr = htonl(0xffffffff << (32 - shift)); 437 } 438 } 439 net.s_addr &= mask.s_addr; 440 host.s_addr = net.s_addr | (htonl(0x0202) & ~mask.s_addr); 441 dhcp.s_addr = net.s_addr | (htonl(0x020f) & ~mask.s_addr); 442 dns.s_addr = net.s_addr | (htonl(0x0203) & ~mask.s_addr); 443 } 444 445 if (vhost && !inet_aton(vhost, &host)) { 446 error_setg(errp, "Failed to parse host"); 447 return -1; 448 } 449 if ((host.s_addr & mask.s_addr) != net.s_addr) { 450 error_setg(errp, "Host doesn't belong to network"); 451 return -1; 452 } 453 454 if (vnameserver && !inet_aton(vnameserver, &dns)) { 455 error_setg(errp, "Failed to parse DNS"); 456 return -1; 457 } 458 if (restricted && (dns.s_addr & mask.s_addr) != net.s_addr) { 459 error_setg(errp, "DNS doesn't belong to network"); 460 return -1; 461 } 462 if (dns.s_addr == host.s_addr) { 463 error_setg(errp, "DNS must be different from host"); 464 return -1; 465 } 466 467 if (vdhcp_start && !inet_aton(vdhcp_start, &dhcp)) { 468 error_setg(errp, "Failed to parse DHCP start address"); 469 return -1; 470 } 471 if ((dhcp.s_addr & mask.s_addr) != net.s_addr) { 472 error_setg(errp, "DHCP doesn't belong to network"); 473 return -1; 474 } 475 if (dhcp.s_addr == host.s_addr || dhcp.s_addr == dns.s_addr) { 476 error_setg(errp, "DHCP must be different from host and DNS"); 477 return -1; 478 } 479 480 #ifndef _WIN32 481 if (vsmbserver && !inet_aton(vsmbserver, &smbsrv)) { 482 error_setg(errp, "Failed to parse SMB address"); 483 return -1; 484 } 485 #endif 486 487 if (!vprefix6) { 488 vprefix6 = "fec0::"; 489 } 490 if (!inet_pton(AF_INET6, vprefix6, &ip6_prefix)) { 491 error_setg(errp, "Failed to parse IPv6 prefix"); 492 return -1; 493 } 494 495 if (!vprefix6_len) { 496 vprefix6_len = 64; 497 } 498 if (vprefix6_len < 0 || vprefix6_len > 126) { 499 error_setg(errp, 500 "Invalid IPv6 prefix provided " 501 "(IPv6 prefix length must be between 0 and 126)"); 502 return -1; 503 } 504 505 if (vhost6) { 506 if (!inet_pton(AF_INET6, vhost6, &ip6_host)) { 507 error_setg(errp, "Failed to parse IPv6 host"); 508 return -1; 509 } 510 if (!in6_equal_net(&ip6_prefix, &ip6_host, vprefix6_len)) { 511 error_setg(errp, "IPv6 Host doesn't belong to network"); 512 return -1; 513 } 514 } else { 515 ip6_host = ip6_prefix; 516 ip6_host.s6_addr[15] |= 2; 517 } 518 519 if (vnameserver6) { 520 if (!inet_pton(AF_INET6, vnameserver6, &ip6_dns)) { 521 error_setg(errp, "Failed to parse IPv6 DNS"); 522 return -1; 523 } 524 if (restricted && !in6_equal_net(&ip6_prefix, &ip6_dns, vprefix6_len)) { 525 error_setg(errp, "IPv6 DNS doesn't belong to network"); 526 return -1; 527 } 528 } else { 529 ip6_dns = ip6_prefix; 530 ip6_dns.s6_addr[15] |= 3; 531 } 532 533 if (vdomainname && !*vdomainname) { 534 error_setg(errp, "'domainname' parameter cannot be empty"); 535 return -1; 536 } 537 538 if (vdomainname && strlen(vdomainname) > 255) { 539 error_setg(errp, "'domainname' parameter cannot exceed 255 bytes"); 540 return -1; 541 } 542 543 if (vhostname && strlen(vhostname) > 255) { 544 error_setg(errp, "'vhostname' parameter cannot exceed 255 bytes"); 545 return -1; 546 } 547 548 if (tftp_server_name && strlen(tftp_server_name) > 255) { 549 error_setg(errp, "'tftp-server-name' parameter cannot exceed 255 bytes"); 550 return -1; 551 } 552 553 nc = qemu_new_net_client(&net_slirp_info, peer, model, name); 554 555 snprintf(nc->info_str, sizeof(nc->info_str), 556 "net=%s,restrict=%s", inet_ntoa(net), 557 restricted ? "on" : "off"); 558 559 s = DO_UPCAST(SlirpState, nc, nc); 560 561 s->slirp = slirp_init(restricted, ipv4, net, mask, host, 562 ipv6, ip6_prefix, vprefix6_len, ip6_host, 563 vhostname, tftp_server_name, 564 tftp_export, bootfile, dhcp, 565 dns, ip6_dns, dnssearch, vdomainname, 566 &slirp_cb, s); 567 QTAILQ_INSERT_TAIL(&slirp_stacks, s, entry); 568 569 /* 570 * Make sure the current bitstream version of slirp is 4, to avoid 571 * QEMU migration incompatibilities, if upstream slirp bumped the 572 * version. 573 * 574 * FIXME: use bitfields of features? teach libslirp to save with 575 * specific version? 576 */ 577 g_assert(slirp_state_version() == 4); 578 register_savevm_live("slirp", 0, slirp_state_version(), 579 &savevm_slirp_state, s->slirp); 580 581 s->poll_notifier.notify = net_slirp_poll_notify; 582 main_loop_poll_add_notifier(&s->poll_notifier); 583 584 for (config = slirp_configs; config; config = config->next) { 585 if (config->flags & SLIRP_CFG_HOSTFWD) { 586 if (slirp_hostfwd(s, config->str, errp) < 0) { 587 goto error; 588 } 589 } else { 590 if (slirp_guestfwd(s, config->str, errp) < 0) { 591 goto error; 592 } 593 } 594 } 595 #ifndef _WIN32 596 if (smb_export) { 597 if (slirp_smb(s, smb_export, smbsrv, errp) < 0) { 598 goto error; 599 } 600 } 601 #endif 602 603 s->exit_notifier.notify = slirp_smb_exit; 604 qemu_add_exit_notifier(&s->exit_notifier); 605 return 0; 606 607 error: 608 qemu_del_net_client(nc); 609 return -1; 610 } 611 612 static SlirpState *slirp_lookup(Monitor *mon, const char *id) 613 { 614 if (id) { 615 NetClientState *nc = qemu_find_netdev(id); 616 if (!nc) { 617 monitor_printf(mon, "unrecognized netdev id '%s'\n", id); 618 return NULL; 619 } 620 if (strcmp(nc->model, "user")) { 621 monitor_printf(mon, "invalid device specified\n"); 622 return NULL; 623 } 624 return DO_UPCAST(SlirpState, nc, nc); 625 } else { 626 if (QTAILQ_EMPTY(&slirp_stacks)) { 627 monitor_printf(mon, "user mode network stack not in use\n"); 628 return NULL; 629 } 630 return QTAILQ_FIRST(&slirp_stacks); 631 } 632 } 633 634 void hmp_hostfwd_remove(Monitor *mon, const QDict *qdict) 635 { 636 struct in_addr host_addr = { .s_addr = INADDR_ANY }; 637 int host_port; 638 char buf[256]; 639 const char *src_str, *p; 640 SlirpState *s; 641 int is_udp = 0; 642 int err; 643 const char *arg1 = qdict_get_str(qdict, "arg1"); 644 const char *arg2 = qdict_get_try_str(qdict, "arg2"); 645 646 if (arg2) { 647 s = slirp_lookup(mon, arg1); 648 src_str = arg2; 649 } else { 650 s = slirp_lookup(mon, NULL); 651 src_str = arg1; 652 } 653 if (!s) { 654 return; 655 } 656 657 p = src_str; 658 if (!p || get_str_sep(buf, sizeof(buf), &p, ':') < 0) { 659 goto fail_syntax; 660 } 661 662 if (!strcmp(buf, "tcp") || buf[0] == '\0') { 663 is_udp = 0; 664 } else if (!strcmp(buf, "udp")) { 665 is_udp = 1; 666 } else { 667 goto fail_syntax; 668 } 669 670 if (get_str_sep(buf, sizeof(buf), &p, ':') < 0) { 671 goto fail_syntax; 672 } 673 if (buf[0] != '\0' && !inet_aton(buf, &host_addr)) { 674 goto fail_syntax; 675 } 676 677 if (qemu_strtoi(p, NULL, 10, &host_port)) { 678 goto fail_syntax; 679 } 680 681 err = slirp_remove_hostfwd(s->slirp, is_udp, host_addr, host_port); 682 683 monitor_printf(mon, "host forwarding rule for %s %s\n", src_str, 684 err ? "not found" : "removed"); 685 return; 686 687 fail_syntax: 688 monitor_printf(mon, "invalid format\n"); 689 } 690 691 static int slirp_hostfwd(SlirpState *s, const char *redir_str, Error **errp) 692 { 693 struct in_addr host_addr = { .s_addr = INADDR_ANY }; 694 struct in_addr guest_addr = { .s_addr = 0 }; 695 int host_port, guest_port; 696 const char *p; 697 char buf[256]; 698 int is_udp; 699 char *end; 700 const char *fail_reason = "Unknown reason"; 701 702 p = redir_str; 703 if (!p || get_str_sep(buf, sizeof(buf), &p, ':') < 0) { 704 fail_reason = "No : separators"; 705 goto fail_syntax; 706 } 707 if (!strcmp(buf, "tcp") || buf[0] == '\0') { 708 is_udp = 0; 709 } else if (!strcmp(buf, "udp")) { 710 is_udp = 1; 711 } else { 712 fail_reason = "Bad protocol name"; 713 goto fail_syntax; 714 } 715 716 if (get_str_sep(buf, sizeof(buf), &p, ':') < 0) { 717 fail_reason = "Missing : separator"; 718 goto fail_syntax; 719 } 720 if (buf[0] != '\0' && !inet_aton(buf, &host_addr)) { 721 fail_reason = "Bad host address"; 722 goto fail_syntax; 723 } 724 725 if (get_str_sep(buf, sizeof(buf), &p, '-') < 0) { 726 fail_reason = "Bad host port separator"; 727 goto fail_syntax; 728 } 729 host_port = strtol(buf, &end, 0); 730 if (*end != '\0' || host_port < 0 || host_port > 65535) { 731 fail_reason = "Bad host port"; 732 goto fail_syntax; 733 } 734 735 if (get_str_sep(buf, sizeof(buf), &p, ':') < 0) { 736 fail_reason = "Missing guest address"; 737 goto fail_syntax; 738 } 739 if (buf[0] != '\0' && !inet_aton(buf, &guest_addr)) { 740 fail_reason = "Bad guest address"; 741 goto fail_syntax; 742 } 743 744 guest_port = strtol(p, &end, 0); 745 if (*end != '\0' || guest_port < 1 || guest_port > 65535) { 746 fail_reason = "Bad guest port"; 747 goto fail_syntax; 748 } 749 750 if (slirp_add_hostfwd(s->slirp, is_udp, host_addr, host_port, guest_addr, 751 guest_port) < 0) { 752 error_setg(errp, "Could not set up host forwarding rule '%s'", 753 redir_str); 754 return -1; 755 } 756 return 0; 757 758 fail_syntax: 759 error_setg(errp, "Invalid host forwarding rule '%s' (%s)", redir_str, 760 fail_reason); 761 return -1; 762 } 763 764 void hmp_hostfwd_add(Monitor *mon, const QDict *qdict) 765 { 766 const char *redir_str; 767 SlirpState *s; 768 const char *arg1 = qdict_get_str(qdict, "arg1"); 769 const char *arg2 = qdict_get_try_str(qdict, "arg2"); 770 771 if (arg2) { 772 s = slirp_lookup(mon, arg1); 773 redir_str = arg2; 774 } else { 775 s = slirp_lookup(mon, NULL); 776 redir_str = arg1; 777 } 778 if (s) { 779 Error *err = NULL; 780 if (slirp_hostfwd(s, redir_str, &err) < 0) { 781 error_report_err(err); 782 } 783 } 784 785 } 786 787 #ifndef _WIN32 788 789 /* automatic user mode samba server configuration */ 790 static void slirp_smb_cleanup(SlirpState *s) 791 { 792 int ret; 793 794 if (s->smb_dir) { 795 gchar *cmd = g_strdup_printf("rm -rf %s", s->smb_dir); 796 ret = system(cmd); 797 if (ret == -1 || !WIFEXITED(ret)) { 798 error_report("'%s' failed.", cmd); 799 } else if (WEXITSTATUS(ret)) { 800 error_report("'%s' failed. Error code: %d", 801 cmd, WEXITSTATUS(ret)); 802 } 803 g_free(cmd); 804 g_free(s->smb_dir); 805 s->smb_dir = NULL; 806 } 807 } 808 809 static int slirp_smb(SlirpState* s, const char *exported_dir, 810 struct in_addr vserver_addr, Error **errp) 811 { 812 char *smb_conf; 813 char *smb_cmdline; 814 struct passwd *passwd; 815 FILE *f; 816 817 passwd = getpwuid(geteuid()); 818 if (!passwd) { 819 error_setg(errp, "Failed to retrieve user name"); 820 return -1; 821 } 822 823 if (access(CONFIG_SMBD_COMMAND, F_OK)) { 824 error_setg(errp, "Could not find '%s', please install it", 825 CONFIG_SMBD_COMMAND); 826 return -1; 827 } 828 829 if (access(exported_dir, R_OK | X_OK)) { 830 error_setg(errp, "Error accessing shared directory '%s': %s", 831 exported_dir, strerror(errno)); 832 return -1; 833 } 834 835 s->smb_dir = g_dir_make_tmp("qemu-smb.XXXXXX", NULL); 836 if (!s->smb_dir) { 837 error_setg(errp, "Could not create samba server dir"); 838 return -1; 839 } 840 smb_conf = g_strdup_printf("%s/%s", s->smb_dir, "smb.conf"); 841 842 f = fopen(smb_conf, "w"); 843 if (!f) { 844 slirp_smb_cleanup(s); 845 error_setg(errp, 846 "Could not create samba server configuration file '%s'", 847 smb_conf); 848 g_free(smb_conf); 849 return -1; 850 } 851 fprintf(f, 852 "[global]\n" 853 "private dir=%s\n" 854 "interfaces=127.0.0.1\n" 855 "bind interfaces only=yes\n" 856 "pid directory=%s\n" 857 "lock directory=%s\n" 858 "state directory=%s\n" 859 "cache directory=%s\n" 860 "ncalrpc dir=%s/ncalrpc\n" 861 "log file=%s/log.smbd\n" 862 "smb passwd file=%s/smbpasswd\n" 863 "security = user\n" 864 "map to guest = Bad User\n" 865 "load printers = no\n" 866 "printing = bsd\n" 867 "disable spoolss = yes\n" 868 "usershare max shares = 0\n" 869 "[qemu]\n" 870 "path=%s\n" 871 "read only=no\n" 872 "guest ok=yes\n" 873 "force user=%s\n", 874 s->smb_dir, 875 s->smb_dir, 876 s->smb_dir, 877 s->smb_dir, 878 s->smb_dir, 879 s->smb_dir, 880 s->smb_dir, 881 s->smb_dir, 882 exported_dir, 883 passwd->pw_name 884 ); 885 fclose(f); 886 887 smb_cmdline = g_strdup_printf("%s -l %s -s %s", 888 CONFIG_SMBD_COMMAND, s->smb_dir, smb_conf); 889 g_free(smb_conf); 890 891 if (slirp_add_exec(s->slirp, smb_cmdline, &vserver_addr, 139) < 0 || 892 slirp_add_exec(s->slirp, smb_cmdline, &vserver_addr, 445) < 0) { 893 slirp_smb_cleanup(s); 894 g_free(smb_cmdline); 895 error_setg(errp, "Conflicting/invalid smbserver address"); 896 return -1; 897 } 898 g_free(smb_cmdline); 899 return 0; 900 } 901 902 #endif /* !defined(_WIN32) */ 903 904 static int guestfwd_can_read(void *opaque) 905 { 906 struct GuestFwd *fwd = opaque; 907 return slirp_socket_can_recv(fwd->slirp, fwd->server, fwd->port); 908 } 909 910 static void guestfwd_read(void *opaque, const uint8_t *buf, int size) 911 { 912 struct GuestFwd *fwd = opaque; 913 slirp_socket_recv(fwd->slirp, fwd->server, fwd->port, buf, size); 914 } 915 916 static ssize_t guestfwd_write(const void *buf, size_t len, void *chr) 917 { 918 return qemu_chr_fe_write_all(chr, buf, len); 919 } 920 921 static int slirp_guestfwd(SlirpState *s, const char *config_str, Error **errp) 922 { 923 /* TODO: IPv6 */ 924 struct in_addr server = { .s_addr = 0 }; 925 struct GuestFwd *fwd; 926 const char *p; 927 char buf[128]; 928 char *end; 929 int port; 930 931 p = config_str; 932 if (get_str_sep(buf, sizeof(buf), &p, ':') < 0) { 933 goto fail_syntax; 934 } 935 if (strcmp(buf, "tcp") && buf[0] != '\0') { 936 goto fail_syntax; 937 } 938 if (get_str_sep(buf, sizeof(buf), &p, ':') < 0) { 939 goto fail_syntax; 940 } 941 if (buf[0] != '\0' && !inet_aton(buf, &server)) { 942 goto fail_syntax; 943 } 944 if (get_str_sep(buf, sizeof(buf), &p, '-') < 0) { 945 goto fail_syntax; 946 } 947 port = strtol(buf, &end, 10); 948 if (*end != '\0' || port < 1 || port > 65535) { 949 goto fail_syntax; 950 } 951 952 snprintf(buf, sizeof(buf), "guestfwd.tcp.%d", port); 953 954 if (g_str_has_prefix(p, "cmd:")) { 955 if (slirp_add_exec(s->slirp, &p[4], &server, port) < 0) { 956 error_setg(errp, "Conflicting/invalid host:port in guest " 957 "forwarding rule '%s'", config_str); 958 return -1; 959 } 960 } else { 961 Error *err = NULL; 962 /* 963 * FIXME: sure we want to support implicit 964 * muxed monitors here? 965 */ 966 Chardev *chr = qemu_chr_new_mux_mon(buf, p, NULL); 967 968 if (!chr) { 969 error_setg(errp, "Could not open guest forwarding device '%s'", 970 buf); 971 return -1; 972 } 973 974 fwd = g_new(struct GuestFwd, 1); 975 qemu_chr_fe_init(&fwd->hd, chr, &err); 976 if (err) { 977 error_propagate(errp, err); 978 object_unparent(OBJECT(chr)); 979 g_free(fwd); 980 return -1; 981 } 982 983 if (slirp_add_guestfwd(s->slirp, guestfwd_write, &fwd->hd, 984 &server, port) < 0) { 985 error_setg(errp, "Conflicting/invalid host:port in guest " 986 "forwarding rule '%s'", config_str); 987 qemu_chr_fe_deinit(&fwd->hd, true); 988 g_free(fwd); 989 return -1; 990 } 991 fwd->server = server; 992 fwd->port = port; 993 fwd->slirp = s->slirp; 994 995 qemu_chr_fe_set_handlers(&fwd->hd, guestfwd_can_read, guestfwd_read, 996 NULL, NULL, fwd, NULL, true); 997 s->fwd = g_slist_append(s->fwd, fwd); 998 } 999 return 0; 1000 1001 fail_syntax: 1002 error_setg(errp, "Invalid guest forwarding rule '%s'", config_str); 1003 return -1; 1004 } 1005 1006 void hmp_info_usernet(Monitor *mon, const QDict *qdict) 1007 { 1008 SlirpState *s; 1009 1010 QTAILQ_FOREACH(s, &slirp_stacks, entry) { 1011 int id; 1012 bool got_hub_id = net_hub_id_for_client(&s->nc, &id) == 0; 1013 char *info = slirp_connection_info(s->slirp); 1014 monitor_printf(mon, "Hub %d (%s):\n%s", 1015 got_hub_id ? id : -1, 1016 s->nc.name, info); 1017 g_free(info); 1018 } 1019 } 1020 1021 static void 1022 net_init_slirp_configs(const StringList *fwd, int flags) 1023 { 1024 while (fwd) { 1025 struct slirp_config_str *config; 1026 1027 config = g_malloc0(sizeof(*config)); 1028 pstrcpy(config->str, sizeof(config->str), fwd->value->str); 1029 config->flags = flags; 1030 config->next = slirp_configs; 1031 slirp_configs = config; 1032 1033 fwd = fwd->next; 1034 } 1035 } 1036 1037 static const char **slirp_dnssearch(const StringList *dnsname) 1038 { 1039 const StringList *c = dnsname; 1040 size_t i = 0, num_opts = 0; 1041 const char **ret; 1042 1043 while (c) { 1044 num_opts++; 1045 c = c->next; 1046 } 1047 1048 if (num_opts == 0) { 1049 return NULL; 1050 } 1051 1052 ret = g_malloc((num_opts + 1) * sizeof(*ret)); 1053 c = dnsname; 1054 while (c) { 1055 ret[i++] = c->value->str; 1056 c = c->next; 1057 } 1058 ret[i] = NULL; 1059 return ret; 1060 } 1061 1062 int net_init_slirp(const Netdev *netdev, const char *name, 1063 NetClientState *peer, Error **errp) 1064 { 1065 struct slirp_config_str *config; 1066 char *vnet; 1067 int ret; 1068 const NetdevUserOptions *user; 1069 const char **dnssearch; 1070 bool ipv4 = true, ipv6 = true; 1071 1072 assert(netdev->type == NET_CLIENT_DRIVER_USER); 1073 user = &netdev->u.user; 1074 1075 if ((user->has_ipv6 && user->ipv6 && !user->has_ipv4) || 1076 (user->has_ipv4 && !user->ipv4)) { 1077 ipv4 = 0; 1078 } 1079 if ((user->has_ipv4 && user->ipv4 && !user->has_ipv6) || 1080 (user->has_ipv6 && !user->ipv6)) { 1081 ipv6 = 0; 1082 } 1083 1084 vnet = user->has_net ? g_strdup(user->net) : 1085 user->has_ip ? g_strdup_printf("%s/24", user->ip) : 1086 NULL; 1087 1088 dnssearch = slirp_dnssearch(user->dnssearch); 1089 1090 /* all optional fields are initialized to "all bits zero" */ 1091 1092 net_init_slirp_configs(user->hostfwd, SLIRP_CFG_HOSTFWD); 1093 net_init_slirp_configs(user->guestfwd, 0); 1094 1095 ret = net_slirp_init(peer, "user", name, user->q_restrict, 1096 ipv4, vnet, user->host, 1097 ipv6, user->ipv6_prefix, user->ipv6_prefixlen, 1098 user->ipv6_host, user->hostname, user->tftp, 1099 user->bootfile, user->dhcpstart, 1100 user->dns, user->ipv6_dns, user->smb, 1101 user->smbserver, dnssearch, user->domainname, 1102 user->tftp_server_name, errp); 1103 1104 while (slirp_configs) { 1105 config = slirp_configs; 1106 slirp_configs = config->next; 1107 g_free(config); 1108 } 1109 1110 g_free(vnet); 1111 g_free(dnssearch); 1112 1113 return ret; 1114 } 1115