slirp.c (33536B)
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/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_SMBD_COMMAND) 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_SMBD_COMMAND) 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 typedef struct SlirpTimer SlirpTimer; 188 struct SlirpTimer { 189 QEMUTimer timer; 190 #if SLIRP_CHECK_VERSION(4,7,0) 191 Slirp *slirp; 192 SlirpTimerId id; 193 void *cb_opaque; 194 #endif 195 }; 196 197 #if SLIRP_CHECK_VERSION(4,7,0) 198 static void net_slirp_init_completed(Slirp *slirp, void *opaque) 199 { 200 SlirpState *s = opaque; 201 s->slirp = slirp; 202 } 203 204 static void net_slirp_timer_cb(void *opaque) 205 { 206 SlirpTimer *t = opaque; 207 slirp_handle_timer(t->slirp, t->id, t->cb_opaque); 208 } 209 210 static void *net_slirp_timer_new_opaque(SlirpTimerId id, 211 void *cb_opaque, void *opaque) 212 { 213 SlirpState *s = opaque; 214 SlirpTimer *t = g_new(SlirpTimer, 1); 215 t->slirp = s->slirp; 216 t->id = id; 217 t->cb_opaque = cb_opaque; 218 timer_init_full(&t->timer, NULL, QEMU_CLOCK_VIRTUAL, 219 SCALE_MS, QEMU_TIMER_ATTR_EXTERNAL, 220 net_slirp_timer_cb, t); 221 return t; 222 } 223 #else 224 static void *net_slirp_timer_new(SlirpTimerCb cb, 225 void *cb_opaque, void *opaque) 226 { 227 SlirpTimer *t = g_new(SlirpTimer, 1); 228 timer_init_full(&t->timer, NULL, QEMU_CLOCK_VIRTUAL, 229 SCALE_MS, QEMU_TIMER_ATTR_EXTERNAL, 230 cb, cb_opaque); 231 return t; 232 } 233 #endif 234 235 static void net_slirp_timer_free(void *timer, void *opaque) 236 { 237 SlirpTimer *t = timer; 238 timer_del(&t->timer); 239 g_free(t); 240 } 241 242 static void net_slirp_timer_mod(void *timer, int64_t expire_timer, 243 void *opaque) 244 { 245 SlirpTimer *t = timer; 246 timer_mod(&t->timer, expire_timer); 247 } 248 249 static void net_slirp_register_poll_fd(int fd, void *opaque) 250 { 251 qemu_fd_register(fd); 252 } 253 254 static void net_slirp_unregister_poll_fd(int fd, void *opaque) 255 { 256 /* no qemu_fd_unregister */ 257 } 258 259 static void net_slirp_notify(void *opaque) 260 { 261 qemu_notify_event(); 262 } 263 264 static const SlirpCb slirp_cb = { 265 .send_packet = net_slirp_send_packet, 266 .guest_error = net_slirp_guest_error, 267 .clock_get_ns = net_slirp_clock_get_ns, 268 #if SLIRP_CHECK_VERSION(4,7,0) 269 .init_completed = net_slirp_init_completed, 270 .timer_new_opaque = net_slirp_timer_new_opaque, 271 #else 272 .timer_new = net_slirp_timer_new, 273 #endif 274 .timer_free = net_slirp_timer_free, 275 .timer_mod = net_slirp_timer_mod, 276 .register_poll_fd = net_slirp_register_poll_fd, 277 .unregister_poll_fd = net_slirp_unregister_poll_fd, 278 .notify = net_slirp_notify, 279 }; 280 281 static int slirp_poll_to_gio(int events) 282 { 283 int ret = 0; 284 285 if (events & SLIRP_POLL_IN) { 286 ret |= G_IO_IN; 287 } 288 if (events & SLIRP_POLL_OUT) { 289 ret |= G_IO_OUT; 290 } 291 if (events & SLIRP_POLL_PRI) { 292 ret |= G_IO_PRI; 293 } 294 if (events & SLIRP_POLL_ERR) { 295 ret |= G_IO_ERR; 296 } 297 if (events & SLIRP_POLL_HUP) { 298 ret |= G_IO_HUP; 299 } 300 301 return ret; 302 } 303 304 static int net_slirp_add_poll(int fd, int events, void *opaque) 305 { 306 GArray *pollfds = opaque; 307 GPollFD pfd = { 308 .fd = fd, 309 .events = slirp_poll_to_gio(events), 310 }; 311 int idx = pollfds->len; 312 g_array_append_val(pollfds, pfd); 313 return idx; 314 } 315 316 static int slirp_gio_to_poll(int events) 317 { 318 int ret = 0; 319 320 if (events & G_IO_IN) { 321 ret |= SLIRP_POLL_IN; 322 } 323 if (events & G_IO_OUT) { 324 ret |= SLIRP_POLL_OUT; 325 } 326 if (events & G_IO_PRI) { 327 ret |= SLIRP_POLL_PRI; 328 } 329 if (events & G_IO_ERR) { 330 ret |= SLIRP_POLL_ERR; 331 } 332 if (events & G_IO_HUP) { 333 ret |= SLIRP_POLL_HUP; 334 } 335 336 return ret; 337 } 338 339 static int net_slirp_get_revents(int idx, void *opaque) 340 { 341 GArray *pollfds = opaque; 342 343 return slirp_gio_to_poll(g_array_index(pollfds, GPollFD, idx).revents); 344 } 345 346 static void net_slirp_poll_notify(Notifier *notifier, void *data) 347 { 348 MainLoopPoll *poll = data; 349 SlirpState *s = container_of(notifier, SlirpState, poll_notifier); 350 351 switch (poll->state) { 352 case MAIN_LOOP_POLL_FILL: 353 slirp_pollfds_fill(s->slirp, &poll->timeout, 354 net_slirp_add_poll, poll->pollfds); 355 break; 356 case MAIN_LOOP_POLL_OK: 357 case MAIN_LOOP_POLL_ERR: 358 slirp_pollfds_poll(s->slirp, poll->state == MAIN_LOOP_POLL_ERR, 359 net_slirp_get_revents, poll->pollfds); 360 break; 361 default: 362 g_assert_not_reached(); 363 } 364 } 365 366 static ssize_t 367 net_slirp_stream_read(void *buf, size_t size, void *opaque) 368 { 369 QEMUFile *f = opaque; 370 371 return qemu_get_buffer(f, buf, size); 372 } 373 374 static ssize_t 375 net_slirp_stream_write(const void *buf, size_t size, void *opaque) 376 { 377 QEMUFile *f = opaque; 378 379 qemu_put_buffer(f, buf, size); 380 if (qemu_file_get_error(f)) { 381 return -1; 382 } 383 384 return size; 385 } 386 387 static int net_slirp_state_load(QEMUFile *f, void *opaque, int version_id) 388 { 389 Slirp *slirp = opaque; 390 391 return slirp_state_load(slirp, version_id, net_slirp_stream_read, f); 392 } 393 394 static void net_slirp_state_save(QEMUFile *f, void *opaque) 395 { 396 Slirp *slirp = opaque; 397 398 slirp_state_save(slirp, net_slirp_stream_write, f); 399 } 400 401 static SaveVMHandlers savevm_slirp_state = { 402 .save_state = net_slirp_state_save, 403 .load_state = net_slirp_state_load, 404 }; 405 406 static int net_slirp_init(NetClientState *peer, const char *model, 407 const char *name, int restricted, 408 bool ipv4, const char *vnetwork, const char *vhost, 409 bool ipv6, const char *vprefix6, int vprefix6_len, 410 const char *vhost6, 411 const char *vhostname, const char *tftp_export, 412 const char *bootfile, const char *vdhcp_start, 413 const char *vnameserver, const char *vnameserver6, 414 const char *smb_export, const char *vsmbserver, 415 const char **dnssearch, const char *vdomainname, 416 const char *tftp_server_name, 417 Error **errp) 418 { 419 /* default settings according to historic slirp */ 420 struct in_addr net = { .s_addr = htonl(0x0a000200) }; /* 10.0.2.0 */ 421 struct in_addr mask = { .s_addr = htonl(0xffffff00) }; /* 255.255.255.0 */ 422 struct in_addr host = { .s_addr = htonl(0x0a000202) }; /* 10.0.2.2 */ 423 struct in_addr dhcp = { .s_addr = htonl(0x0a00020f) }; /* 10.0.2.15 */ 424 struct in_addr dns = { .s_addr = htonl(0x0a000203) }; /* 10.0.2.3 */ 425 struct in6_addr ip6_prefix; 426 struct in6_addr ip6_host; 427 struct in6_addr ip6_dns; 428 #if defined(CONFIG_SMBD_COMMAND) 429 struct in_addr smbsrv = { .s_addr = 0 }; 430 #endif 431 SlirpConfig cfg = { 0 }; 432 NetClientState *nc; 433 SlirpState *s; 434 char buf[20]; 435 uint32_t addr; 436 int shift; 437 char *end; 438 struct slirp_config_str *config; 439 440 if (!ipv4 && (vnetwork || vhost || vnameserver)) { 441 error_setg(errp, "IPv4 disabled but netmask/host/dns provided"); 442 return -1; 443 } 444 445 if (!ipv6 && (vprefix6 || vhost6 || vnameserver6)) { 446 error_setg(errp, "IPv6 disabled but prefix/host6/dns6 provided"); 447 return -1; 448 } 449 450 if (!ipv4 && !ipv6) { 451 /* It doesn't make sense to disable both */ 452 error_setg(errp, "IPv4 and IPv6 disabled"); 453 return -1; 454 } 455 456 if (vnetwork) { 457 if (get_str_sep(buf, sizeof(buf), &vnetwork, '/') < 0) { 458 if (!inet_aton(vnetwork, &net)) { 459 error_setg(errp, "Failed to parse netmask"); 460 return -1; 461 } 462 addr = ntohl(net.s_addr); 463 if (!(addr & 0x80000000)) { 464 mask.s_addr = htonl(0xff000000); /* class A */ 465 } else if ((addr & 0xfff00000) == 0xac100000) { 466 mask.s_addr = htonl(0xfff00000); /* priv. 172.16.0.0/12 */ 467 } else if ((addr & 0xc0000000) == 0x80000000) { 468 mask.s_addr = htonl(0xffff0000); /* class B */ 469 } else if ((addr & 0xffff0000) == 0xc0a80000) { 470 mask.s_addr = htonl(0xffff0000); /* priv. 192.168.0.0/16 */ 471 } else if ((addr & 0xffff0000) == 0xc6120000) { 472 mask.s_addr = htonl(0xfffe0000); /* tests 198.18.0.0/15 */ 473 } else if ((addr & 0xe0000000) == 0xe0000000) { 474 mask.s_addr = htonl(0xffffff00); /* class C */ 475 } else { 476 mask.s_addr = htonl(0xfffffff0); /* multicast/reserved */ 477 } 478 } else { 479 if (!inet_aton(buf, &net)) { 480 error_setg(errp, "Failed to parse netmask"); 481 return -1; 482 } 483 shift = strtol(vnetwork, &end, 10); 484 if (*end != '\0') { 485 if (!inet_aton(vnetwork, &mask)) { 486 error_setg(errp, 487 "Failed to parse netmask (trailing chars)"); 488 return -1; 489 } 490 } else if (shift < 4 || shift > 32) { 491 error_setg(errp, 492 "Invalid netmask provided (must be in range 4-32)"); 493 return -1; 494 } else { 495 mask.s_addr = htonl(0xffffffff << (32 - shift)); 496 } 497 } 498 net.s_addr &= mask.s_addr; 499 host.s_addr = net.s_addr | (htonl(0x0202) & ~mask.s_addr); 500 dhcp.s_addr = net.s_addr | (htonl(0x020f) & ~mask.s_addr); 501 dns.s_addr = net.s_addr | (htonl(0x0203) & ~mask.s_addr); 502 } 503 504 if (vhost && !inet_aton(vhost, &host)) { 505 error_setg(errp, "Failed to parse host"); 506 return -1; 507 } 508 if ((host.s_addr & mask.s_addr) != net.s_addr) { 509 error_setg(errp, "Host doesn't belong to network"); 510 return -1; 511 } 512 513 if (vnameserver && !inet_aton(vnameserver, &dns)) { 514 error_setg(errp, "Failed to parse DNS"); 515 return -1; 516 } 517 if (restricted && (dns.s_addr & mask.s_addr) != net.s_addr) { 518 error_setg(errp, "DNS doesn't belong to network"); 519 return -1; 520 } 521 if (dns.s_addr == host.s_addr) { 522 error_setg(errp, "DNS must be different from host"); 523 return -1; 524 } 525 526 if (vdhcp_start && !inet_aton(vdhcp_start, &dhcp)) { 527 error_setg(errp, "Failed to parse DHCP start address"); 528 return -1; 529 } 530 if ((dhcp.s_addr & mask.s_addr) != net.s_addr) { 531 error_setg(errp, "DHCP doesn't belong to network"); 532 return -1; 533 } 534 if (dhcp.s_addr == host.s_addr || dhcp.s_addr == dns.s_addr) { 535 error_setg(errp, "DHCP must be different from host and DNS"); 536 return -1; 537 } 538 539 #if defined(CONFIG_SMBD_COMMAND) 540 if (vsmbserver && !inet_aton(vsmbserver, &smbsrv)) { 541 error_setg(errp, "Failed to parse SMB address"); 542 return -1; 543 } 544 #endif 545 546 if (!vprefix6) { 547 vprefix6 = "fec0::"; 548 } 549 if (!inet_pton(AF_INET6, vprefix6, &ip6_prefix)) { 550 error_setg(errp, "Failed to parse IPv6 prefix"); 551 return -1; 552 } 553 554 if (!vprefix6_len) { 555 vprefix6_len = 64; 556 } 557 if (vprefix6_len < 0 || vprefix6_len > 126) { 558 error_setg(errp, 559 "Invalid IPv6 prefix provided " 560 "(IPv6 prefix length must be between 0 and 126)"); 561 return -1; 562 } 563 564 if (vhost6) { 565 if (!inet_pton(AF_INET6, vhost6, &ip6_host)) { 566 error_setg(errp, "Failed to parse IPv6 host"); 567 return -1; 568 } 569 if (!in6_equal_net(&ip6_prefix, &ip6_host, vprefix6_len)) { 570 error_setg(errp, "IPv6 Host doesn't belong to network"); 571 return -1; 572 } 573 } else { 574 ip6_host = ip6_prefix; 575 ip6_host.s6_addr[15] |= 2; 576 } 577 578 if (vnameserver6) { 579 if (!inet_pton(AF_INET6, vnameserver6, &ip6_dns)) { 580 error_setg(errp, "Failed to parse IPv6 DNS"); 581 return -1; 582 } 583 if (restricted && !in6_equal_net(&ip6_prefix, &ip6_dns, vprefix6_len)) { 584 error_setg(errp, "IPv6 DNS doesn't belong to network"); 585 return -1; 586 } 587 } else { 588 ip6_dns = ip6_prefix; 589 ip6_dns.s6_addr[15] |= 3; 590 } 591 592 if (vdomainname && !*vdomainname) { 593 error_setg(errp, "'domainname' parameter cannot be empty"); 594 return -1; 595 } 596 597 if (vdomainname && strlen(vdomainname) > 255) { 598 error_setg(errp, "'domainname' parameter cannot exceed 255 bytes"); 599 return -1; 600 } 601 602 if (vhostname && strlen(vhostname) > 255) { 603 error_setg(errp, "'vhostname' parameter cannot exceed 255 bytes"); 604 return -1; 605 } 606 607 if (tftp_server_name && strlen(tftp_server_name) > 255) { 608 error_setg(errp, "'tftp-server-name' parameter cannot exceed 255 bytes"); 609 return -1; 610 } 611 612 nc = qemu_new_net_client(&net_slirp_info, peer, model, name); 613 614 qemu_set_info_str(nc, "net=%s,restrict=%s", inet_ntoa(net), 615 restricted ? "on" : "off"); 616 617 s = DO_UPCAST(SlirpState, nc, nc); 618 619 cfg.version = SLIRP_CHECK_VERSION(4,7,0) ? 4 : 1; 620 cfg.restricted = restricted; 621 cfg.in_enabled = ipv4; 622 cfg.vnetwork = net; 623 cfg.vnetmask = mask; 624 cfg.vhost = host; 625 cfg.in6_enabled = ipv6; 626 cfg.vprefix_addr6 = ip6_prefix; 627 cfg.vprefix_len = vprefix6_len; 628 cfg.vhost6 = ip6_host; 629 cfg.vhostname = vhostname; 630 cfg.tftp_server_name = tftp_server_name; 631 cfg.tftp_path = tftp_export; 632 cfg.bootfile = bootfile; 633 cfg.vdhcp_start = dhcp; 634 cfg.vnameserver = dns; 635 cfg.vnameserver6 = ip6_dns; 636 cfg.vdnssearch = dnssearch; 637 cfg.vdomainname = vdomainname; 638 s->slirp = slirp_new(&cfg, &slirp_cb, s); 639 QTAILQ_INSERT_TAIL(&slirp_stacks, s, entry); 640 641 /* 642 * Make sure the current bitstream version of slirp is 4, to avoid 643 * QEMU migration incompatibilities, if upstream slirp bumped the 644 * version. 645 * 646 * FIXME: use bitfields of features? teach libslirp to save with 647 * specific version? 648 */ 649 g_assert(slirp_state_version() == 4); 650 register_savevm_live("slirp", 0, slirp_state_version(), 651 &savevm_slirp_state, s->slirp); 652 653 s->poll_notifier.notify = net_slirp_poll_notify; 654 main_loop_poll_add_notifier(&s->poll_notifier); 655 656 for (config = slirp_configs; config; config = config->next) { 657 if (config->flags & SLIRP_CFG_HOSTFWD) { 658 if (slirp_hostfwd(s, config->str, errp) < 0) { 659 goto error; 660 } 661 } else { 662 if (slirp_guestfwd(s, config->str, errp) < 0) { 663 goto error; 664 } 665 } 666 } 667 #if defined(CONFIG_SMBD_COMMAND) 668 if (smb_export) { 669 if (slirp_smb(s, smb_export, smbsrv, errp) < 0) { 670 goto error; 671 } 672 } 673 #endif 674 675 s->exit_notifier.notify = slirp_smb_exit; 676 qemu_add_exit_notifier(&s->exit_notifier); 677 return 0; 678 679 error: 680 qemu_del_net_client(nc); 681 return -1; 682 } 683 684 static SlirpState *slirp_lookup(Monitor *mon, const char *id) 685 { 686 if (id) { 687 NetClientState *nc = qemu_find_netdev(id); 688 if (!nc) { 689 monitor_printf(mon, "unrecognized netdev id '%s'\n", id); 690 return NULL; 691 } 692 if (strcmp(nc->model, "user")) { 693 monitor_printf(mon, "invalid device specified\n"); 694 return NULL; 695 } 696 return DO_UPCAST(SlirpState, nc, nc); 697 } else { 698 if (QTAILQ_EMPTY(&slirp_stacks)) { 699 monitor_printf(mon, "user mode network stack not in use\n"); 700 return NULL; 701 } 702 return QTAILQ_FIRST(&slirp_stacks); 703 } 704 } 705 706 void hmp_hostfwd_remove(Monitor *mon, const QDict *qdict) 707 { 708 struct in_addr host_addr = { .s_addr = INADDR_ANY }; 709 int host_port; 710 char buf[256]; 711 const char *src_str, *p; 712 SlirpState *s; 713 int is_udp = 0; 714 int err; 715 const char *arg1 = qdict_get_str(qdict, "arg1"); 716 const char *arg2 = qdict_get_try_str(qdict, "arg2"); 717 718 if (arg2) { 719 s = slirp_lookup(mon, arg1); 720 src_str = arg2; 721 } else { 722 s = slirp_lookup(mon, NULL); 723 src_str = arg1; 724 } 725 if (!s) { 726 return; 727 } 728 729 p = src_str; 730 if (!p || get_str_sep(buf, sizeof(buf), &p, ':') < 0) { 731 goto fail_syntax; 732 } 733 734 if (!strcmp(buf, "tcp") || buf[0] == '\0') { 735 is_udp = 0; 736 } else if (!strcmp(buf, "udp")) { 737 is_udp = 1; 738 } else { 739 goto fail_syntax; 740 } 741 742 if (get_str_sep(buf, sizeof(buf), &p, ':') < 0) { 743 goto fail_syntax; 744 } 745 if (buf[0] != '\0' && !inet_aton(buf, &host_addr)) { 746 goto fail_syntax; 747 } 748 749 if (qemu_strtoi(p, NULL, 10, &host_port)) { 750 goto fail_syntax; 751 } 752 753 err = slirp_remove_hostfwd(s->slirp, is_udp, host_addr, host_port); 754 755 monitor_printf(mon, "host forwarding rule for %s %s\n", src_str, 756 err ? "not found" : "removed"); 757 return; 758 759 fail_syntax: 760 monitor_printf(mon, "invalid format\n"); 761 } 762 763 static int slirp_hostfwd(SlirpState *s, const char *redir_str, Error **errp) 764 { 765 struct in_addr host_addr = { .s_addr = INADDR_ANY }; 766 struct in_addr guest_addr = { .s_addr = 0 }; 767 int host_port, guest_port; 768 const char *p; 769 char buf[256]; 770 int is_udp; 771 char *end; 772 const char *fail_reason = "Unknown reason"; 773 774 p = redir_str; 775 if (!p || get_str_sep(buf, sizeof(buf), &p, ':') < 0) { 776 fail_reason = "No : separators"; 777 goto fail_syntax; 778 } 779 if (!strcmp(buf, "tcp") || buf[0] == '\0') { 780 is_udp = 0; 781 } else if (!strcmp(buf, "udp")) { 782 is_udp = 1; 783 } else { 784 fail_reason = "Bad protocol name"; 785 goto fail_syntax; 786 } 787 788 if (get_str_sep(buf, sizeof(buf), &p, ':') < 0) { 789 fail_reason = "Missing : separator"; 790 goto fail_syntax; 791 } 792 if (buf[0] != '\0' && !inet_aton(buf, &host_addr)) { 793 fail_reason = "Bad host address"; 794 goto fail_syntax; 795 } 796 797 if (get_str_sep(buf, sizeof(buf), &p, '-') < 0) { 798 fail_reason = "Bad host port separator"; 799 goto fail_syntax; 800 } 801 host_port = strtol(buf, &end, 0); 802 if (*end != '\0' || host_port < 0 || host_port > 65535) { 803 fail_reason = "Bad host port"; 804 goto fail_syntax; 805 } 806 807 if (get_str_sep(buf, sizeof(buf), &p, ':') < 0) { 808 fail_reason = "Missing guest address"; 809 goto fail_syntax; 810 } 811 if (buf[0] != '\0' && !inet_aton(buf, &guest_addr)) { 812 fail_reason = "Bad guest address"; 813 goto fail_syntax; 814 } 815 816 guest_port = strtol(p, &end, 0); 817 if (*end != '\0' || guest_port < 1 || guest_port > 65535) { 818 fail_reason = "Bad guest port"; 819 goto fail_syntax; 820 } 821 822 if (slirp_add_hostfwd(s->slirp, is_udp, host_addr, host_port, guest_addr, 823 guest_port) < 0) { 824 error_setg(errp, "Could not set up host forwarding rule '%s'", 825 redir_str); 826 return -1; 827 } 828 return 0; 829 830 fail_syntax: 831 error_setg(errp, "Invalid host forwarding rule '%s' (%s)", redir_str, 832 fail_reason); 833 return -1; 834 } 835 836 void hmp_hostfwd_add(Monitor *mon, const QDict *qdict) 837 { 838 const char *redir_str; 839 SlirpState *s; 840 const char *arg1 = qdict_get_str(qdict, "arg1"); 841 const char *arg2 = qdict_get_try_str(qdict, "arg2"); 842 843 if (arg2) { 844 s = slirp_lookup(mon, arg1); 845 redir_str = arg2; 846 } else { 847 s = slirp_lookup(mon, NULL); 848 redir_str = arg1; 849 } 850 if (s) { 851 Error *err = NULL; 852 if (slirp_hostfwd(s, redir_str, &err) < 0) { 853 error_report_err(err); 854 } 855 } 856 857 } 858 859 #if defined(CONFIG_SMBD_COMMAND) 860 861 /* automatic user mode samba server configuration */ 862 static void slirp_smb_cleanup(SlirpState *s) 863 { 864 int ret; 865 866 if (s->smb_dir) { 867 gchar *cmd = g_strdup_printf("rm -rf %s", s->smb_dir); 868 ret = system(cmd); 869 if (ret == -1 || !WIFEXITED(ret)) { 870 error_report("'%s' failed.", cmd); 871 } else if (WEXITSTATUS(ret)) { 872 error_report("'%s' failed. Error code: %d", 873 cmd, WEXITSTATUS(ret)); 874 } 875 g_free(cmd); 876 g_free(s->smb_dir); 877 s->smb_dir = NULL; 878 } 879 } 880 881 static int slirp_smb(SlirpState* s, const char *exported_dir, 882 struct in_addr vserver_addr, Error **errp) 883 { 884 char *smb_conf; 885 char *smb_cmdline; 886 struct passwd *passwd; 887 FILE *f; 888 889 passwd = getpwuid(geteuid()); 890 if (!passwd) { 891 error_setg(errp, "Failed to retrieve user name"); 892 return -1; 893 } 894 895 if (access(CONFIG_SMBD_COMMAND, F_OK)) { 896 error_setg(errp, "Could not find '%s', please install it", 897 CONFIG_SMBD_COMMAND); 898 return -1; 899 } 900 901 if (access(exported_dir, R_OK | X_OK)) { 902 error_setg(errp, "Error accessing shared directory '%s': %s", 903 exported_dir, strerror(errno)); 904 return -1; 905 } 906 907 s->smb_dir = g_dir_make_tmp("qemu-smb.XXXXXX", NULL); 908 if (!s->smb_dir) { 909 error_setg(errp, "Could not create samba server dir"); 910 return -1; 911 } 912 smb_conf = g_strdup_printf("%s/%s", s->smb_dir, "smb.conf"); 913 914 f = fopen(smb_conf, "w"); 915 if (!f) { 916 slirp_smb_cleanup(s); 917 error_setg(errp, 918 "Could not create samba server configuration file '%s'", 919 smb_conf); 920 g_free(smb_conf); 921 return -1; 922 } 923 fprintf(f, 924 "[global]\n" 925 "private dir=%s\n" 926 "interfaces=127.0.0.1\n" 927 "bind interfaces only=yes\n" 928 "pid directory=%s\n" 929 "lock directory=%s\n" 930 "state directory=%s\n" 931 "cache directory=%s\n" 932 "ncalrpc dir=%s/ncalrpc\n" 933 "log file=%s/log.smbd\n" 934 "smb passwd file=%s/smbpasswd\n" 935 "security = user\n" 936 "map to guest = Bad User\n" 937 "load printers = no\n" 938 "printing = bsd\n" 939 "disable spoolss = yes\n" 940 "usershare max shares = 0\n" 941 "[qemu]\n" 942 "path=%s\n" 943 "read only=no\n" 944 "guest ok=yes\n" 945 "force user=%s\n", 946 s->smb_dir, 947 s->smb_dir, 948 s->smb_dir, 949 s->smb_dir, 950 s->smb_dir, 951 s->smb_dir, 952 s->smb_dir, 953 s->smb_dir, 954 exported_dir, 955 passwd->pw_name 956 ); 957 fclose(f); 958 959 smb_cmdline = g_strdup_printf("%s -l %s -s %s", 960 CONFIG_SMBD_COMMAND, s->smb_dir, smb_conf); 961 g_free(smb_conf); 962 963 if (slirp_add_exec(s->slirp, smb_cmdline, &vserver_addr, 139) < 0 || 964 slirp_add_exec(s->slirp, smb_cmdline, &vserver_addr, 445) < 0) { 965 slirp_smb_cleanup(s); 966 g_free(smb_cmdline); 967 error_setg(errp, "Conflicting/invalid smbserver address"); 968 return -1; 969 } 970 g_free(smb_cmdline); 971 return 0; 972 } 973 974 #endif /* defined(CONFIG_SMBD_COMMAND) */ 975 976 static int guestfwd_can_read(void *opaque) 977 { 978 struct GuestFwd *fwd = opaque; 979 return slirp_socket_can_recv(fwd->slirp, fwd->server, fwd->port); 980 } 981 982 static void guestfwd_read(void *opaque, const uint8_t *buf, int size) 983 { 984 struct GuestFwd *fwd = opaque; 985 slirp_socket_recv(fwd->slirp, fwd->server, fwd->port, buf, size); 986 } 987 988 static ssize_t guestfwd_write(const void *buf, size_t len, void *chr) 989 { 990 return qemu_chr_fe_write_all(chr, buf, len); 991 } 992 993 static int slirp_guestfwd(SlirpState *s, const char *config_str, Error **errp) 994 { 995 /* TODO: IPv6 */ 996 struct in_addr server = { .s_addr = 0 }; 997 struct GuestFwd *fwd; 998 const char *p; 999 char buf[128]; 1000 char *end; 1001 int port; 1002 1003 p = config_str; 1004 if (get_str_sep(buf, sizeof(buf), &p, ':') < 0) { 1005 goto fail_syntax; 1006 } 1007 if (strcmp(buf, "tcp") && buf[0] != '\0') { 1008 goto fail_syntax; 1009 } 1010 if (get_str_sep(buf, sizeof(buf), &p, ':') < 0) { 1011 goto fail_syntax; 1012 } 1013 if (buf[0] != '\0' && !inet_aton(buf, &server)) { 1014 goto fail_syntax; 1015 } 1016 if (get_str_sep(buf, sizeof(buf), &p, '-') < 0) { 1017 goto fail_syntax; 1018 } 1019 port = strtol(buf, &end, 10); 1020 if (*end != '\0' || port < 1 || port > 65535) { 1021 goto fail_syntax; 1022 } 1023 1024 snprintf(buf, sizeof(buf), "guestfwd.tcp.%d", port); 1025 1026 if (g_str_has_prefix(p, "cmd:")) { 1027 if (slirp_add_exec(s->slirp, &p[4], &server, port) < 0) { 1028 error_setg(errp, "Conflicting/invalid host:port in guest " 1029 "forwarding rule '%s'", config_str); 1030 return -1; 1031 } 1032 } else { 1033 Error *err = NULL; 1034 /* 1035 * FIXME: sure we want to support implicit 1036 * muxed monitors here? 1037 */ 1038 Chardev *chr = qemu_chr_new_mux_mon(buf, p, NULL); 1039 1040 if (!chr) { 1041 error_setg(errp, "Could not open guest forwarding device '%s'", 1042 buf); 1043 return -1; 1044 } 1045 1046 fwd = g_new(struct GuestFwd, 1); 1047 qemu_chr_fe_init(&fwd->hd, chr, &err); 1048 if (err) { 1049 error_propagate(errp, err); 1050 object_unparent(OBJECT(chr)); 1051 g_free(fwd); 1052 return -1; 1053 } 1054 1055 if (slirp_add_guestfwd(s->slirp, guestfwd_write, &fwd->hd, 1056 &server, port) < 0) { 1057 error_setg(errp, "Conflicting/invalid host:port in guest " 1058 "forwarding rule '%s'", config_str); 1059 qemu_chr_fe_deinit(&fwd->hd, true); 1060 g_free(fwd); 1061 return -1; 1062 } 1063 fwd->server = server; 1064 fwd->port = port; 1065 fwd->slirp = s->slirp; 1066 1067 qemu_chr_fe_set_handlers(&fwd->hd, guestfwd_can_read, guestfwd_read, 1068 NULL, NULL, fwd, NULL, true); 1069 s->fwd = g_slist_append(s->fwd, fwd); 1070 } 1071 return 0; 1072 1073 fail_syntax: 1074 error_setg(errp, "Invalid guest forwarding rule '%s'", config_str); 1075 return -1; 1076 } 1077 1078 void hmp_info_usernet(Monitor *mon, const QDict *qdict) 1079 { 1080 SlirpState *s; 1081 1082 QTAILQ_FOREACH(s, &slirp_stacks, entry) { 1083 int id; 1084 bool got_hub_id = net_hub_id_for_client(&s->nc, &id) == 0; 1085 char *info = slirp_connection_info(s->slirp); 1086 monitor_printf(mon, "Hub %d (%s):\n%s", 1087 got_hub_id ? id : -1, 1088 s->nc.name, info); 1089 g_free(info); 1090 } 1091 } 1092 1093 static void 1094 net_init_slirp_configs(const StringList *fwd, int flags) 1095 { 1096 while (fwd) { 1097 struct slirp_config_str *config; 1098 1099 config = g_malloc0(sizeof(*config)); 1100 pstrcpy(config->str, sizeof(config->str), fwd->value->str); 1101 config->flags = flags; 1102 config->next = slirp_configs; 1103 slirp_configs = config; 1104 1105 fwd = fwd->next; 1106 } 1107 } 1108 1109 static const char **slirp_dnssearch(const StringList *dnsname) 1110 { 1111 const StringList *c = dnsname; 1112 size_t i = 0, num_opts = 0; 1113 const char **ret; 1114 1115 while (c) { 1116 num_opts++; 1117 c = c->next; 1118 } 1119 1120 if (num_opts == 0) { 1121 return NULL; 1122 } 1123 1124 ret = g_malloc((num_opts + 1) * sizeof(*ret)); 1125 c = dnsname; 1126 while (c) { 1127 ret[i++] = c->value->str; 1128 c = c->next; 1129 } 1130 ret[i] = NULL; 1131 return ret; 1132 } 1133 1134 int net_init_slirp(const Netdev *netdev, const char *name, 1135 NetClientState *peer, Error **errp) 1136 { 1137 struct slirp_config_str *config; 1138 char *vnet; 1139 int ret; 1140 const NetdevUserOptions *user; 1141 const char **dnssearch; 1142 bool ipv4 = true, ipv6 = true; 1143 1144 assert(netdev->type == NET_CLIENT_DRIVER_USER); 1145 user = &netdev->u.user; 1146 1147 if ((user->has_ipv6 && user->ipv6 && !user->has_ipv4) || 1148 (user->has_ipv4 && !user->ipv4)) { 1149 ipv4 = 0; 1150 } 1151 if ((user->has_ipv4 && user->ipv4 && !user->has_ipv6) || 1152 (user->has_ipv6 && !user->ipv6)) { 1153 ipv6 = 0; 1154 } 1155 1156 vnet = user->has_net ? g_strdup(user->net) : 1157 user->has_ip ? g_strdup_printf("%s/24", user->ip) : 1158 NULL; 1159 1160 dnssearch = slirp_dnssearch(user->dnssearch); 1161 1162 /* all optional fields are initialized to "all bits zero" */ 1163 1164 net_init_slirp_configs(user->hostfwd, SLIRP_CFG_HOSTFWD); 1165 net_init_slirp_configs(user->guestfwd, 0); 1166 1167 ret = net_slirp_init(peer, "user", name, user->q_restrict, 1168 ipv4, vnet, user->host, 1169 ipv6, user->ipv6_prefix, user->ipv6_prefixlen, 1170 user->ipv6_host, user->hostname, user->tftp, 1171 user->bootfile, user->dhcpstart, 1172 user->dns, user->ipv6_dns, user->smb, 1173 user->smbserver, dnssearch, user->domainname, 1174 user->tftp_server_name, errp); 1175 1176 while (slirp_configs) { 1177 config = slirp_configs; 1178 slirp_configs = config->next; 1179 g_free(config); 1180 } 1181 1182 g_free(vnet); 1183 g_free(dnssearch); 1184 1185 return ret; 1186 }