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 "net/slirp.h" 27 28 29 #ifndef _WIN32 30 #include <pwd.h> 31 #include <sys/wait.h> 32 #endif 33 #include "net/net.h" 34 #include "clients.h" 35 #include "hub.h" 36 #include "monitor/monitor.h" 37 #include "qemu/error-report.h" 38 #include "qemu/sockets.h" 39 #include "slirp/libslirp.h" 40 #include "slirp/ip6.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 47 static int get_str_sep(char *buf, int buf_size, const char **pp, int sep) 48 { 49 const char *p, *p1; 50 int len; 51 p = *pp; 52 p1 = strchr(p, sep); 53 if (!p1) 54 return -1; 55 len = p1 - p; 56 p1++; 57 if (buf_size > 0) { 58 if (len > buf_size - 1) 59 len = buf_size - 1; 60 memcpy(buf, p, len); 61 buf[len] = '\0'; 62 } 63 *pp = p1; 64 return 0; 65 } 66 67 /* slirp network adapter */ 68 69 #define SLIRP_CFG_HOSTFWD 1 70 #define SLIRP_CFG_LEGACY 2 71 72 struct slirp_config_str { 73 struct slirp_config_str *next; 74 int flags; 75 char str[1024]; 76 int legacy_format; 77 }; 78 79 typedef struct SlirpState { 80 NetClientState nc; 81 QTAILQ_ENTRY(SlirpState) entry; 82 Slirp *slirp; 83 Notifier exit_notifier; 84 #ifndef _WIN32 85 gchar *smb_dir; 86 #endif 87 } SlirpState; 88 89 static struct slirp_config_str *slirp_configs; 90 const char *legacy_tftp_prefix; 91 const char *legacy_bootp_filename; 92 static QTAILQ_HEAD(slirp_stacks, SlirpState) slirp_stacks = 93 QTAILQ_HEAD_INITIALIZER(slirp_stacks); 94 95 static int slirp_hostfwd(SlirpState *s, const char *redir_str, 96 int legacy_format, Error **errp); 97 static int slirp_guestfwd(SlirpState *s, const char *config_str, 98 int legacy_format, Error **errp); 99 100 #ifndef _WIN32 101 static const char *legacy_smb_export; 102 103 static int slirp_smb(SlirpState *s, const char *exported_dir, 104 struct in_addr vserver_addr, Error **errp); 105 static void slirp_smb_cleanup(SlirpState *s); 106 #else 107 static inline void slirp_smb_cleanup(SlirpState *s) { } 108 #endif 109 110 void slirp_output(void *opaque, const uint8_t *pkt, int pkt_len) 111 { 112 SlirpState *s = opaque; 113 114 qemu_send_packet(&s->nc, pkt, pkt_len); 115 } 116 117 static ssize_t net_slirp_receive(NetClientState *nc, const uint8_t *buf, size_t size) 118 { 119 SlirpState *s = DO_UPCAST(SlirpState, nc, nc); 120 121 slirp_input(s->slirp, buf, size); 122 123 return size; 124 } 125 126 static void slirp_smb_exit(Notifier *n, void *data) 127 { 128 SlirpState *s = container_of(n, SlirpState, exit_notifier); 129 slirp_smb_cleanup(s); 130 } 131 132 static void net_slirp_cleanup(NetClientState *nc) 133 { 134 SlirpState *s = DO_UPCAST(SlirpState, nc, nc); 135 136 slirp_cleanup(s->slirp); 137 if (s->exit_notifier.notify) { 138 qemu_remove_exit_notifier(&s->exit_notifier); 139 } 140 slirp_smb_cleanup(s); 141 QTAILQ_REMOVE(&slirp_stacks, s, entry); 142 } 143 144 static NetClientInfo net_slirp_info = { 145 .type = NET_CLIENT_DRIVER_USER, 146 .size = sizeof(SlirpState), 147 .receive = net_slirp_receive, 148 .cleanup = net_slirp_cleanup, 149 }; 150 151 static int net_slirp_init(NetClientState *peer, const char *model, 152 const char *name, int restricted, 153 bool ipv4, const char *vnetwork, const char *vhost, 154 bool ipv6, const char *vprefix6, int vprefix6_len, 155 const char *vhost6, 156 const char *vhostname, const char *tftp_export, 157 const char *bootfile, const char *vdhcp_start, 158 const char *vnameserver, const char *vnameserver6, 159 const char *smb_export, const char *vsmbserver, 160 const char **dnssearch, const char *vdomainname, 161 Error **errp) 162 { 163 /* default settings according to historic slirp */ 164 struct in_addr net = { .s_addr = htonl(0x0a000200) }; /* 10.0.2.0 */ 165 struct in_addr mask = { .s_addr = htonl(0xffffff00) }; /* 255.255.255.0 */ 166 struct in_addr host = { .s_addr = htonl(0x0a000202) }; /* 10.0.2.2 */ 167 struct in_addr dhcp = { .s_addr = htonl(0x0a00020f) }; /* 10.0.2.15 */ 168 struct in_addr dns = { .s_addr = htonl(0x0a000203) }; /* 10.0.2.3 */ 169 struct in6_addr ip6_prefix; 170 struct in6_addr ip6_host; 171 struct in6_addr ip6_dns; 172 #ifndef _WIN32 173 struct in_addr smbsrv = { .s_addr = 0 }; 174 #endif 175 NetClientState *nc; 176 SlirpState *s; 177 char buf[20]; 178 uint32_t addr; 179 int shift; 180 char *end; 181 struct slirp_config_str *config; 182 183 if (!ipv4 && (vnetwork || vhost || vnameserver)) { 184 error_setg(errp, "IPv4 disabled but netmask/host/dns provided"); 185 return -1; 186 } 187 188 if (!ipv6 && (vprefix6 || vhost6 || vnameserver6)) { 189 error_setg(errp, "IPv6 disabled but prefix/host6/dns6 provided"); 190 return -1; 191 } 192 193 if (!ipv4 && !ipv6) { 194 /* It doesn't make sense to disable both */ 195 error_setg(errp, "IPv4 and IPv6 disabled"); 196 return -1; 197 } 198 199 if (!tftp_export) { 200 tftp_export = legacy_tftp_prefix; 201 } 202 if (!bootfile) { 203 bootfile = legacy_bootp_filename; 204 } 205 206 if (vnetwork) { 207 if (get_str_sep(buf, sizeof(buf), &vnetwork, '/') < 0) { 208 if (!inet_aton(vnetwork, &net)) { 209 error_setg(errp, "Failed to parse netmask"); 210 return -1; 211 } 212 addr = ntohl(net.s_addr); 213 if (!(addr & 0x80000000)) { 214 mask.s_addr = htonl(0xff000000); /* class A */ 215 } else if ((addr & 0xfff00000) == 0xac100000) { 216 mask.s_addr = htonl(0xfff00000); /* priv. 172.16.0.0/12 */ 217 } else if ((addr & 0xc0000000) == 0x80000000) { 218 mask.s_addr = htonl(0xffff0000); /* class B */ 219 } else if ((addr & 0xffff0000) == 0xc0a80000) { 220 mask.s_addr = htonl(0xffff0000); /* priv. 192.168.0.0/16 */ 221 } else if ((addr & 0xffff0000) == 0xc6120000) { 222 mask.s_addr = htonl(0xfffe0000); /* tests 198.18.0.0/15 */ 223 } else if ((addr & 0xe0000000) == 0xe0000000) { 224 mask.s_addr = htonl(0xffffff00); /* class C */ 225 } else { 226 mask.s_addr = htonl(0xfffffff0); /* multicast/reserved */ 227 } 228 } else { 229 if (!inet_aton(buf, &net)) { 230 error_setg(errp, "Failed to parse netmask"); 231 return -1; 232 } 233 shift = strtol(vnetwork, &end, 10); 234 if (*end != '\0') { 235 if (!inet_aton(vnetwork, &mask)) { 236 error_setg(errp, 237 "Failed to parse netmask (trailing chars)"); 238 return -1; 239 } 240 } else if (shift < 4 || shift > 32) { 241 error_setg(errp, 242 "Invalid netmask provided (must be in range 4-32)"); 243 return -1; 244 } else { 245 mask.s_addr = htonl(0xffffffff << (32 - shift)); 246 } 247 } 248 net.s_addr &= mask.s_addr; 249 host.s_addr = net.s_addr | (htonl(0x0202) & ~mask.s_addr); 250 dhcp.s_addr = net.s_addr | (htonl(0x020f) & ~mask.s_addr); 251 dns.s_addr = net.s_addr | (htonl(0x0203) & ~mask.s_addr); 252 } 253 254 if (vhost && !inet_aton(vhost, &host)) { 255 error_setg(errp, "Failed to parse host"); 256 return -1; 257 } 258 if ((host.s_addr & mask.s_addr) != net.s_addr) { 259 error_setg(errp, "Host doesn't belong to network"); 260 return -1; 261 } 262 263 if (vnameserver && !inet_aton(vnameserver, &dns)) { 264 error_setg(errp, "Failed to parse DNS"); 265 return -1; 266 } 267 if ((dns.s_addr & mask.s_addr) != net.s_addr) { 268 error_setg(errp, "DNS doesn't belong to network"); 269 return -1; 270 } 271 if (dns.s_addr == host.s_addr) { 272 error_setg(errp, "DNS must be different from host"); 273 return -1; 274 } 275 276 if (vdhcp_start && !inet_aton(vdhcp_start, &dhcp)) { 277 error_setg(errp, "Failed to parse DHCP start address"); 278 return -1; 279 } 280 if ((dhcp.s_addr & mask.s_addr) != net.s_addr) { 281 error_setg(errp, "DHCP doesn't belong to network"); 282 return -1; 283 } 284 if (dhcp.s_addr == host.s_addr || dhcp.s_addr == dns.s_addr) { 285 error_setg(errp, "DNS must be different from host and DNS"); 286 return -1; 287 } 288 289 #ifndef _WIN32 290 if (vsmbserver && !inet_aton(vsmbserver, &smbsrv)) { 291 error_setg(errp, "Failed to parse SMB address"); 292 return -1; 293 } 294 #endif 295 296 #if defined(_WIN32) && (_WIN32_WINNT < 0x0600) 297 /* No inet_pton helper before Vista... */ 298 if (vprefix6) { 299 /* Unsupported */ 300 error_setg(errp, "IPv6 prefix not supported"); 301 return -1; 302 } 303 memset(&ip6_prefix, 0, sizeof(ip6_prefix)); 304 ip6_prefix.s6_addr[0] = 0xfe; 305 ip6_prefix.s6_addr[1] = 0xc0; 306 #else 307 if (!vprefix6) { 308 vprefix6 = "fec0::"; 309 } 310 if (!inet_pton(AF_INET6, vprefix6, &ip6_prefix)) { 311 error_setg(errp, "Failed to parse IPv6 prefix"); 312 return -1; 313 } 314 #endif 315 316 if (!vprefix6_len) { 317 vprefix6_len = 64; 318 } 319 if (vprefix6_len < 0 || vprefix6_len > 126) { 320 error_setg(errp, 321 "Invalid prefix provided (prefix len must be in range 0-126"); 322 return -1; 323 } 324 325 if (vhost6) { 326 #if defined(_WIN32) && (_WIN32_WINNT < 0x0600) 327 error_setg(errp, "IPv6 host not supported"); 328 return -1; 329 #else 330 if (!inet_pton(AF_INET6, vhost6, &ip6_host)) { 331 error_setg(errp, "Failed to parse IPv6 host"); 332 return -1; 333 } 334 if (!in6_equal_net(&ip6_prefix, &ip6_host, vprefix6_len)) { 335 error_setg(errp, "IPv6 Host doesn't belong to network"); 336 return -1; 337 } 338 #endif 339 } else { 340 ip6_host = ip6_prefix; 341 ip6_host.s6_addr[15] |= 2; 342 } 343 344 if (vnameserver6) { 345 #if defined(_WIN32) && (_WIN32_WINNT < 0x0600) 346 error_setg(errp, "IPv6 DNS not supported"); 347 return -1; 348 #else 349 if (!inet_pton(AF_INET6, vnameserver6, &ip6_dns)) { 350 error_setg(errp, "Failed to parse IPv6 DNS"); 351 return -1; 352 } 353 if (!in6_equal_net(&ip6_prefix, &ip6_dns, vprefix6_len)) { 354 error_setg(errp, "IPv6 DNS doesn't belong to network"); 355 return -1; 356 } 357 #endif 358 } else { 359 ip6_dns = ip6_prefix; 360 ip6_dns.s6_addr[15] |= 3; 361 } 362 363 if (vdomainname && !*vdomainname) { 364 error_setg(errp, "'domainname' parameter cannot be empty"); 365 return -1; 366 } 367 368 369 nc = qemu_new_net_client(&net_slirp_info, peer, model, name); 370 371 snprintf(nc->info_str, sizeof(nc->info_str), 372 "net=%s,restrict=%s", inet_ntoa(net), 373 restricted ? "on" : "off"); 374 375 s = DO_UPCAST(SlirpState, nc, nc); 376 377 s->slirp = slirp_init(restricted, ipv4, net, mask, host, 378 ipv6, ip6_prefix, vprefix6_len, ip6_host, 379 vhostname, tftp_export, bootfile, dhcp, 380 dns, ip6_dns, dnssearch, vdomainname, s); 381 QTAILQ_INSERT_TAIL(&slirp_stacks, s, entry); 382 383 for (config = slirp_configs; config; config = config->next) { 384 if (config->flags & SLIRP_CFG_HOSTFWD) { 385 if (slirp_hostfwd(s, config->str, 386 config->flags & SLIRP_CFG_LEGACY, errp) < 0) { 387 goto error; 388 } 389 } else { 390 if (slirp_guestfwd(s, config->str, 391 config->flags & SLIRP_CFG_LEGACY, errp) < 0) { 392 goto error; 393 } 394 } 395 } 396 #ifndef _WIN32 397 if (!smb_export) { 398 smb_export = legacy_smb_export; 399 } 400 if (smb_export) { 401 if (slirp_smb(s, smb_export, smbsrv, errp) < 0) { 402 goto error; 403 } 404 } 405 #endif 406 407 s->exit_notifier.notify = slirp_smb_exit; 408 qemu_add_exit_notifier(&s->exit_notifier); 409 return 0; 410 411 error: 412 qemu_del_net_client(nc); 413 return -1; 414 } 415 416 static SlirpState *slirp_lookup(Monitor *mon, const char *hub_id, 417 const char *name) 418 { 419 if (name) { 420 NetClientState *nc; 421 if (hub_id) { 422 nc = net_hub_find_client_by_name(strtol(hub_id, NULL, 0), name); 423 if (!nc) { 424 monitor_printf(mon, "unrecognized (hub-id, stackname) pair\n"); 425 return NULL; 426 } 427 } else { 428 nc = qemu_find_netdev(name); 429 if (!nc) { 430 monitor_printf(mon, "unrecognized netdev id '%s'\n", name); 431 return NULL; 432 } 433 } 434 if (strcmp(nc->model, "user")) { 435 monitor_printf(mon, "invalid device specified\n"); 436 return NULL; 437 } 438 return DO_UPCAST(SlirpState, nc, nc); 439 } else { 440 if (QTAILQ_EMPTY(&slirp_stacks)) { 441 monitor_printf(mon, "user mode network stack not in use\n"); 442 return NULL; 443 } 444 return QTAILQ_FIRST(&slirp_stacks); 445 } 446 } 447 448 void hmp_hostfwd_remove(Monitor *mon, const QDict *qdict) 449 { 450 struct in_addr host_addr = { .s_addr = INADDR_ANY }; 451 int host_port; 452 char buf[256]; 453 const char *src_str, *p; 454 SlirpState *s; 455 int is_udp = 0; 456 int err; 457 const char *arg1 = qdict_get_str(qdict, "arg1"); 458 const char *arg2 = qdict_get_try_str(qdict, "arg2"); 459 const char *arg3 = qdict_get_try_str(qdict, "arg3"); 460 461 if (arg3) { 462 s = slirp_lookup(mon, arg1, arg2); 463 src_str = arg3; 464 } else if (arg2) { 465 s = slirp_lookup(mon, NULL, arg1); 466 src_str = arg2; 467 } else { 468 s = slirp_lookup(mon, NULL, NULL); 469 src_str = arg1; 470 } 471 if (!s) { 472 return; 473 } 474 475 p = src_str; 476 if (!p || get_str_sep(buf, sizeof(buf), &p, ':') < 0) { 477 goto fail_syntax; 478 } 479 480 if (!strcmp(buf, "tcp") || buf[0] == '\0') { 481 is_udp = 0; 482 } else if (!strcmp(buf, "udp")) { 483 is_udp = 1; 484 } else { 485 goto fail_syntax; 486 } 487 488 if (get_str_sep(buf, sizeof(buf), &p, ':') < 0) { 489 goto fail_syntax; 490 } 491 if (buf[0] != '\0' && !inet_aton(buf, &host_addr)) { 492 goto fail_syntax; 493 } 494 495 if (qemu_strtoi(p, NULL, 10, &host_port)) { 496 goto fail_syntax; 497 } 498 499 err = slirp_remove_hostfwd(s->slirp, is_udp, host_addr, host_port); 500 501 monitor_printf(mon, "host forwarding rule for %s %s\n", src_str, 502 err ? "not found" : "removed"); 503 return; 504 505 fail_syntax: 506 monitor_printf(mon, "invalid format\n"); 507 } 508 509 static int slirp_hostfwd(SlirpState *s, const char *redir_str, 510 int legacy_format, Error **errp) 511 { 512 struct in_addr host_addr = { .s_addr = INADDR_ANY }; 513 struct in_addr guest_addr = { .s_addr = 0 }; 514 int host_port, guest_port; 515 const char *p; 516 char buf[256]; 517 int is_udp; 518 char *end; 519 const char *fail_reason = "Unknown reason"; 520 521 p = redir_str; 522 if (!p || get_str_sep(buf, sizeof(buf), &p, ':') < 0) { 523 fail_reason = "No : separators"; 524 goto fail_syntax; 525 } 526 if (!strcmp(buf, "tcp") || buf[0] == '\0') { 527 is_udp = 0; 528 } else if (!strcmp(buf, "udp")) { 529 is_udp = 1; 530 } else { 531 fail_reason = "Bad protocol name"; 532 goto fail_syntax; 533 } 534 535 if (!legacy_format) { 536 if (get_str_sep(buf, sizeof(buf), &p, ':') < 0) { 537 fail_reason = "Missing : separator"; 538 goto fail_syntax; 539 } 540 if (buf[0] != '\0' && !inet_aton(buf, &host_addr)) { 541 fail_reason = "Bad host address"; 542 goto fail_syntax; 543 } 544 } 545 546 if (get_str_sep(buf, sizeof(buf), &p, legacy_format ? ':' : '-') < 0) { 547 fail_reason = "Bad host port separator"; 548 goto fail_syntax; 549 } 550 host_port = strtol(buf, &end, 0); 551 if (*end != '\0' || host_port < 0 || host_port > 65535) { 552 fail_reason = "Bad host port"; 553 goto fail_syntax; 554 } 555 556 if (get_str_sep(buf, sizeof(buf), &p, ':') < 0) { 557 fail_reason = "Missing guest address"; 558 goto fail_syntax; 559 } 560 if (buf[0] != '\0' && !inet_aton(buf, &guest_addr)) { 561 fail_reason = "Bad guest address"; 562 goto fail_syntax; 563 } 564 565 guest_port = strtol(p, &end, 0); 566 if (*end != '\0' || guest_port < 1 || guest_port > 65535) { 567 fail_reason = "Bad guest port"; 568 goto fail_syntax; 569 } 570 571 if (slirp_add_hostfwd(s->slirp, is_udp, host_addr, host_port, guest_addr, 572 guest_port) < 0) { 573 error_setg(errp, "Could not set up host forwarding rule '%s'", 574 redir_str); 575 return -1; 576 } 577 return 0; 578 579 fail_syntax: 580 error_setg(errp, "Invalid host forwarding rule '%s' (%s)", redir_str, 581 fail_reason); 582 return -1; 583 } 584 585 void hmp_hostfwd_add(Monitor *mon, const QDict *qdict) 586 { 587 const char *redir_str; 588 SlirpState *s; 589 const char *arg1 = qdict_get_str(qdict, "arg1"); 590 const char *arg2 = qdict_get_try_str(qdict, "arg2"); 591 const char *arg3 = qdict_get_try_str(qdict, "arg3"); 592 593 if (arg3) { 594 s = slirp_lookup(mon, arg1, arg2); 595 redir_str = arg3; 596 } else if (arg2) { 597 s = slirp_lookup(mon, NULL, arg1); 598 redir_str = arg2; 599 } else { 600 s = slirp_lookup(mon, NULL, NULL); 601 redir_str = arg1; 602 } 603 if (s) { 604 Error *err = NULL; 605 if (slirp_hostfwd(s, redir_str, 0, &err) < 0) { 606 error_report_err(err); 607 } 608 } 609 610 } 611 612 int net_slirp_redir(const char *redir_str) 613 { 614 struct slirp_config_str *config; 615 Error *err = NULL; 616 int res; 617 618 if (QTAILQ_EMPTY(&slirp_stacks)) { 619 config = g_malloc(sizeof(*config)); 620 pstrcpy(config->str, sizeof(config->str), redir_str); 621 config->flags = SLIRP_CFG_HOSTFWD | SLIRP_CFG_LEGACY; 622 config->next = slirp_configs; 623 slirp_configs = config; 624 return 0; 625 } 626 627 res = slirp_hostfwd(QTAILQ_FIRST(&slirp_stacks), redir_str, 1, &err); 628 if (res < 0) { 629 error_report_err(err); 630 } 631 return res; 632 } 633 634 #ifndef _WIN32 635 636 /* automatic user mode samba server configuration */ 637 static void slirp_smb_cleanup(SlirpState *s) 638 { 639 int ret; 640 641 if (s->smb_dir) { 642 gchar *cmd = g_strdup_printf("rm -rf %s", s->smb_dir); 643 ret = system(cmd); 644 if (ret == -1 || !WIFEXITED(ret)) { 645 error_report("'%s' failed.", cmd); 646 } else if (WEXITSTATUS(ret)) { 647 error_report("'%s' failed. Error code: %d", 648 cmd, WEXITSTATUS(ret)); 649 } 650 g_free(cmd); 651 g_free(s->smb_dir); 652 s->smb_dir = NULL; 653 } 654 } 655 656 static int slirp_smb(SlirpState* s, const char *exported_dir, 657 struct in_addr vserver_addr, Error **errp) 658 { 659 char *smb_conf; 660 char *smb_cmdline; 661 struct passwd *passwd; 662 FILE *f; 663 664 passwd = getpwuid(geteuid()); 665 if (!passwd) { 666 error_setg(errp, "Failed to retrieve user name"); 667 return -1; 668 } 669 670 if (access(CONFIG_SMBD_COMMAND, F_OK)) { 671 error_setg(errp, "Could not find '%s', please install it", 672 CONFIG_SMBD_COMMAND); 673 return -1; 674 } 675 676 if (access(exported_dir, R_OK | X_OK)) { 677 error_setg(errp, "Error accessing shared directory '%s': %s", 678 exported_dir, strerror(errno)); 679 return -1; 680 } 681 682 s->smb_dir = g_dir_make_tmp("qemu-smb.XXXXXX", NULL); 683 if (!s->smb_dir) { 684 error_setg(errp, "Could not create samba server dir"); 685 return -1; 686 } 687 smb_conf = g_strdup_printf("%s/%s", s->smb_dir, "smb.conf"); 688 689 f = fopen(smb_conf, "w"); 690 if (!f) { 691 slirp_smb_cleanup(s); 692 error_setg(errp, 693 "Could not create samba server configuration file '%s'", 694 smb_conf); 695 g_free(smb_conf); 696 return -1; 697 } 698 fprintf(f, 699 "[global]\n" 700 "private dir=%s\n" 701 "interfaces=127.0.0.1\n" 702 "bind interfaces only=yes\n" 703 "pid directory=%s\n" 704 "lock directory=%s\n" 705 "state directory=%s\n" 706 "cache directory=%s\n" 707 "ncalrpc dir=%s/ncalrpc\n" 708 "log file=%s/log.smbd\n" 709 "smb passwd file=%s/smbpasswd\n" 710 "security = user\n" 711 "map to guest = Bad User\n" 712 "load printers = no\n" 713 "printing = bsd\n" 714 "disable spoolss = yes\n" 715 "usershare max shares = 0\n" 716 "[qemu]\n" 717 "path=%s\n" 718 "read only=no\n" 719 "guest ok=yes\n" 720 "force user=%s\n", 721 s->smb_dir, 722 s->smb_dir, 723 s->smb_dir, 724 s->smb_dir, 725 s->smb_dir, 726 s->smb_dir, 727 s->smb_dir, 728 s->smb_dir, 729 exported_dir, 730 passwd->pw_name 731 ); 732 fclose(f); 733 734 smb_cmdline = g_strdup_printf("%s -l %s -s %s", 735 CONFIG_SMBD_COMMAND, s->smb_dir, smb_conf); 736 g_free(smb_conf); 737 738 if (slirp_add_exec(s->slirp, 0, smb_cmdline, &vserver_addr, 139) < 0 || 739 slirp_add_exec(s->slirp, 0, smb_cmdline, &vserver_addr, 445) < 0) { 740 slirp_smb_cleanup(s); 741 g_free(smb_cmdline); 742 error_setg(errp, "Conflicting/invalid smbserver address"); 743 return -1; 744 } 745 g_free(smb_cmdline); 746 return 0; 747 } 748 749 /* automatic user mode samba server configuration (legacy interface) */ 750 int net_slirp_smb(const char *exported_dir) 751 { 752 struct in_addr vserver_addr = { .s_addr = 0 }; 753 754 if (legacy_smb_export) { 755 fprintf(stderr, "-smb given twice\n"); 756 return -1; 757 } 758 legacy_smb_export = exported_dir; 759 if (!QTAILQ_EMPTY(&slirp_stacks)) { 760 Error *err = NULL; 761 int res = slirp_smb(QTAILQ_FIRST(&slirp_stacks), exported_dir, 762 vserver_addr, &err); 763 if (res < 0) { 764 error_report_err(err); 765 } 766 return res; 767 } 768 return 0; 769 } 770 771 #endif /* !defined(_WIN32) */ 772 773 struct GuestFwd { 774 CharBackend hd; 775 struct in_addr server; 776 int port; 777 Slirp *slirp; 778 }; 779 780 static int guestfwd_can_read(void *opaque) 781 { 782 struct GuestFwd *fwd = opaque; 783 return slirp_socket_can_recv(fwd->slirp, fwd->server, fwd->port); 784 } 785 786 static void guestfwd_read(void *opaque, const uint8_t *buf, int size) 787 { 788 struct GuestFwd *fwd = opaque; 789 slirp_socket_recv(fwd->slirp, fwd->server, fwd->port, buf, size); 790 } 791 792 static int slirp_guestfwd(SlirpState *s, const char *config_str, 793 int legacy_format, Error **errp) 794 { 795 struct in_addr server = { .s_addr = 0 }; 796 struct GuestFwd *fwd; 797 const char *p; 798 char buf[128]; 799 char *end; 800 int port; 801 802 p = config_str; 803 if (legacy_format) { 804 if (get_str_sep(buf, sizeof(buf), &p, ':') < 0) { 805 goto fail_syntax; 806 } 807 } else { 808 if (get_str_sep(buf, sizeof(buf), &p, ':') < 0) { 809 goto fail_syntax; 810 } 811 if (strcmp(buf, "tcp") && buf[0] != '\0') { 812 goto fail_syntax; 813 } 814 if (get_str_sep(buf, sizeof(buf), &p, ':') < 0) { 815 goto fail_syntax; 816 } 817 if (buf[0] != '\0' && !inet_aton(buf, &server)) { 818 goto fail_syntax; 819 } 820 if (get_str_sep(buf, sizeof(buf), &p, '-') < 0) { 821 goto fail_syntax; 822 } 823 } 824 port = strtol(buf, &end, 10); 825 if (*end != '\0' || port < 1 || port > 65535) { 826 goto fail_syntax; 827 } 828 829 snprintf(buf, sizeof(buf), "guestfwd.tcp.%d", port); 830 831 if ((strlen(p) > 4) && !strncmp(p, "cmd:", 4)) { 832 if (slirp_add_exec(s->slirp, 0, &p[4], &server, port) < 0) { 833 error_setg(errp, "Conflicting/invalid host:port in guest " 834 "forwarding rule '%s'", config_str); 835 return -1; 836 } 837 } else { 838 Error *err = NULL; 839 Chardev *chr = qemu_chr_new(buf, p); 840 841 if (!chr) { 842 error_setg(errp, "Could not open guest forwarding device '%s'", 843 buf); 844 return -1; 845 } 846 847 fwd = g_new(struct GuestFwd, 1); 848 qemu_chr_fe_init(&fwd->hd, chr, &err); 849 if (err) { 850 error_propagate(errp, err); 851 g_free(fwd); 852 return -1; 853 } 854 855 if (slirp_add_exec(s->slirp, 3, &fwd->hd, &server, port) < 0) { 856 error_setg(errp, "Conflicting/invalid host:port in guest " 857 "forwarding rule '%s'", config_str); 858 g_free(fwd); 859 return -1; 860 } 861 fwd->server = server; 862 fwd->port = port; 863 fwd->slirp = s->slirp; 864 865 qemu_chr_fe_set_handlers(&fwd->hd, guestfwd_can_read, guestfwd_read, 866 NULL, NULL, fwd, NULL, true); 867 } 868 return 0; 869 870 fail_syntax: 871 error_setg(errp, "Invalid guest forwarding rule '%s'", config_str); 872 return -1; 873 } 874 875 void hmp_info_usernet(Monitor *mon, const QDict *qdict) 876 { 877 SlirpState *s; 878 879 QTAILQ_FOREACH(s, &slirp_stacks, entry) { 880 int id; 881 bool got_hub_id = net_hub_id_for_client(&s->nc, &id) == 0; 882 monitor_printf(mon, "Hub %d (%s):\n", 883 got_hub_id ? id : -1, 884 s->nc.name); 885 slirp_connection_info(s->slirp, mon); 886 } 887 } 888 889 static void 890 net_init_slirp_configs(const StringList *fwd, int flags) 891 { 892 while (fwd) { 893 struct slirp_config_str *config; 894 895 config = g_malloc0(sizeof(*config)); 896 pstrcpy(config->str, sizeof(config->str), fwd->value->str); 897 config->flags = flags; 898 config->next = slirp_configs; 899 slirp_configs = config; 900 901 fwd = fwd->next; 902 } 903 } 904 905 static const char **slirp_dnssearch(const StringList *dnsname) 906 { 907 const StringList *c = dnsname; 908 size_t i = 0, num_opts = 0; 909 const char **ret; 910 911 while (c) { 912 num_opts++; 913 c = c->next; 914 } 915 916 if (num_opts == 0) { 917 return NULL; 918 } 919 920 ret = g_malloc((num_opts + 1) * sizeof(*ret)); 921 c = dnsname; 922 while (c) { 923 ret[i++] = c->value->str; 924 c = c->next; 925 } 926 ret[i] = NULL; 927 return ret; 928 } 929 930 int net_init_slirp(const Netdev *netdev, const char *name, 931 NetClientState *peer, Error **errp) 932 { 933 struct slirp_config_str *config; 934 char *vnet; 935 int ret; 936 const NetdevUserOptions *user; 937 const char **dnssearch; 938 bool ipv4 = true, ipv6 = true; 939 940 assert(netdev->type == NET_CLIENT_DRIVER_USER); 941 user = &netdev->u.user; 942 943 if ((user->has_ipv6 && user->ipv6 && !user->has_ipv4) || 944 (user->has_ipv4 && !user->ipv4)) { 945 ipv4 = 0; 946 } 947 if ((user->has_ipv4 && user->ipv4 && !user->has_ipv6) || 948 (user->has_ipv6 && !user->ipv6)) { 949 ipv6 = 0; 950 } 951 952 vnet = user->has_net ? g_strdup(user->net) : 953 user->has_ip ? g_strdup_printf("%s/24", user->ip) : 954 NULL; 955 956 dnssearch = slirp_dnssearch(user->dnssearch); 957 958 /* all optional fields are initialized to "all bits zero" */ 959 960 net_init_slirp_configs(user->hostfwd, SLIRP_CFG_HOSTFWD); 961 net_init_slirp_configs(user->guestfwd, 0); 962 963 ret = net_slirp_init(peer, "user", name, user->q_restrict, 964 ipv4, vnet, user->host, 965 ipv6, user->ipv6_prefix, user->ipv6_prefixlen, 966 user->ipv6_host, user->hostname, user->tftp, 967 user->bootfile, user->dhcpstart, 968 user->dns, user->ipv6_dns, user->smb, 969 user->smbserver, dnssearch, user->domainname, errp); 970 971 while (slirp_configs) { 972 config = slirp_configs; 973 slirp_configs = config->next; 974 g_free(config); 975 } 976 977 g_free(vnet); 978 g_free(dnssearch); 979 980 return ret; 981 } 982