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