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 #include "qemu/osdep.h" 25 #include "net/slirp.h" 26 27 28 #ifndef _WIN32 29 #include <pwd.h> 30 #include <sys/wait.h> 31 #endif 32 #include "net/net.h" 33 #include "clients.h" 34 #include "hub.h" 35 #include "monitor/monitor.h" 36 #include "qemu/error-report.h" 37 #include "qemu/sockets.h" 38 #include "slirp/libslirp.h" 39 #include "slirp/ip6.h" 40 #include "sysemu/char.h" 41 #include "sysemu/sysemu.h" 42 #include "qemu/cutils.h" 43 44 static int get_str_sep(char *buf, int buf_size, const char **pp, int sep) 45 { 46 const char *p, *p1; 47 int len; 48 p = *pp; 49 p1 = strchr(p, sep); 50 if (!p1) 51 return -1; 52 len = p1 - p; 53 p1++; 54 if (buf_size > 0) { 55 if (len > buf_size - 1) 56 len = buf_size - 1; 57 memcpy(buf, p, len); 58 buf[len] = '\0'; 59 } 60 *pp = p1; 61 return 0; 62 } 63 64 /* slirp network adapter */ 65 66 #define SLIRP_CFG_HOSTFWD 1 67 #define SLIRP_CFG_LEGACY 2 68 69 struct slirp_config_str { 70 struct slirp_config_str *next; 71 int flags; 72 char str[1024]; 73 int legacy_format; 74 }; 75 76 typedef struct SlirpState { 77 NetClientState nc; 78 QTAILQ_ENTRY(SlirpState) entry; 79 Slirp *slirp; 80 Notifier exit_notifier; 81 #ifndef _WIN32 82 char smb_dir[128]; 83 #endif 84 } SlirpState; 85 86 static struct slirp_config_str *slirp_configs; 87 const char *legacy_tftp_prefix; 88 const char *legacy_bootp_filename; 89 static QTAILQ_HEAD(slirp_stacks, SlirpState) slirp_stacks = 90 QTAILQ_HEAD_INITIALIZER(slirp_stacks); 91 92 static int slirp_hostfwd(SlirpState *s, const char *redir_str, 93 int legacy_format); 94 static int slirp_guestfwd(SlirpState *s, const char *config_str, 95 int legacy_format); 96 97 #ifndef _WIN32 98 static const char *legacy_smb_export; 99 100 static int slirp_smb(SlirpState *s, const char *exported_dir, 101 struct in_addr vserver_addr); 102 static void slirp_smb_cleanup(SlirpState *s); 103 #else 104 static inline void slirp_smb_cleanup(SlirpState *s) { } 105 #endif 106 107 void slirp_output(void *opaque, const uint8_t *pkt, int pkt_len) 108 { 109 SlirpState *s = opaque; 110 111 qemu_send_packet(&s->nc, pkt, pkt_len); 112 } 113 114 static ssize_t net_slirp_receive(NetClientState *nc, const uint8_t *buf, size_t size) 115 { 116 SlirpState *s = DO_UPCAST(SlirpState, nc, nc); 117 118 slirp_input(s->slirp, buf, size); 119 120 return size; 121 } 122 123 static void slirp_smb_exit(Notifier *n, void *data) 124 { 125 SlirpState *s = container_of(n, SlirpState, exit_notifier); 126 slirp_smb_cleanup(s); 127 } 128 129 static void net_slirp_cleanup(NetClientState *nc) 130 { 131 SlirpState *s = DO_UPCAST(SlirpState, nc, nc); 132 133 slirp_cleanup(s->slirp); 134 qemu_remove_exit_notifier(&s->exit_notifier); 135 slirp_smb_cleanup(s); 136 QTAILQ_REMOVE(&slirp_stacks, s, entry); 137 } 138 139 static NetClientInfo net_slirp_info = { 140 .type = NET_CLIENT_DRIVER_USER, 141 .size = sizeof(SlirpState), 142 .receive = net_slirp_receive, 143 .cleanup = net_slirp_cleanup, 144 }; 145 146 static int net_slirp_init(NetClientState *peer, const char *model, 147 const char *name, int restricted, 148 bool ipv4, const char *vnetwork, const char *vhost, 149 bool ipv6, const char *vprefix6, int vprefix6_len, 150 const char *vhost6, 151 const char *vhostname, const char *tftp_export, 152 const char *bootfile, const char *vdhcp_start, 153 const char *vnameserver, const char *vnameserver6, 154 const char *smb_export, const char *vsmbserver, 155 const char **dnssearch) 156 { 157 /* default settings according to historic slirp */ 158 struct in_addr net = { .s_addr = htonl(0x0a000200) }; /* 10.0.2.0 */ 159 struct in_addr mask = { .s_addr = htonl(0xffffff00) }; /* 255.255.255.0 */ 160 struct in_addr host = { .s_addr = htonl(0x0a000202) }; /* 10.0.2.2 */ 161 struct in_addr dhcp = { .s_addr = htonl(0x0a00020f) }; /* 10.0.2.15 */ 162 struct in_addr dns = { .s_addr = htonl(0x0a000203) }; /* 10.0.2.3 */ 163 struct in6_addr ip6_prefix; 164 struct in6_addr ip6_host; 165 struct in6_addr ip6_dns; 166 #ifndef _WIN32 167 struct in_addr smbsrv = { .s_addr = 0 }; 168 #endif 169 NetClientState *nc; 170 SlirpState *s; 171 char buf[20]; 172 uint32_t addr; 173 int shift; 174 char *end; 175 struct slirp_config_str *config; 176 177 if (!ipv4 && (vnetwork || vhost || vnameserver)) { 178 return -1; 179 } 180 181 if (!ipv6 && (vprefix6 || vhost6 || vnameserver6)) { 182 return -1; 183 } 184 185 if (!ipv4 && !ipv6) { 186 /* It doesn't make sense to disable both */ 187 return -1; 188 } 189 190 if (!tftp_export) { 191 tftp_export = legacy_tftp_prefix; 192 } 193 if (!bootfile) { 194 bootfile = legacy_bootp_filename; 195 } 196 197 if (vnetwork) { 198 if (get_str_sep(buf, sizeof(buf), &vnetwork, '/') < 0) { 199 if (!inet_aton(vnetwork, &net)) { 200 return -1; 201 } 202 addr = ntohl(net.s_addr); 203 if (!(addr & 0x80000000)) { 204 mask.s_addr = htonl(0xff000000); /* class A */ 205 } else if ((addr & 0xfff00000) == 0xac100000) { 206 mask.s_addr = htonl(0xfff00000); /* priv. 172.16.0.0/12 */ 207 } else if ((addr & 0xc0000000) == 0x80000000) { 208 mask.s_addr = htonl(0xffff0000); /* class B */ 209 } else if ((addr & 0xffff0000) == 0xc0a80000) { 210 mask.s_addr = htonl(0xffff0000); /* priv. 192.168.0.0/16 */ 211 } else if ((addr & 0xffff0000) == 0xc6120000) { 212 mask.s_addr = htonl(0xfffe0000); /* tests 198.18.0.0/15 */ 213 } else if ((addr & 0xe0000000) == 0xe0000000) { 214 mask.s_addr = htonl(0xffffff00); /* class C */ 215 } else { 216 mask.s_addr = htonl(0xfffffff0); /* multicast/reserved */ 217 } 218 } else { 219 if (!inet_aton(buf, &net)) { 220 return -1; 221 } 222 shift = strtol(vnetwork, &end, 10); 223 if (*end != '\0') { 224 if (!inet_aton(vnetwork, &mask)) { 225 return -1; 226 } 227 } else if (shift < 4 || shift > 32) { 228 return -1; 229 } else { 230 mask.s_addr = htonl(0xffffffff << (32 - shift)); 231 } 232 } 233 net.s_addr &= mask.s_addr; 234 host.s_addr = net.s_addr | (htonl(0x0202) & ~mask.s_addr); 235 dhcp.s_addr = net.s_addr | (htonl(0x020f) & ~mask.s_addr); 236 dns.s_addr = net.s_addr | (htonl(0x0203) & ~mask.s_addr); 237 } 238 239 if (vhost && !inet_aton(vhost, &host)) { 240 return -1; 241 } 242 if ((host.s_addr & mask.s_addr) != net.s_addr) { 243 return -1; 244 } 245 246 if (vnameserver && !inet_aton(vnameserver, &dns)) { 247 return -1; 248 } 249 if ((dns.s_addr & mask.s_addr) != net.s_addr || 250 dns.s_addr == host.s_addr) { 251 return -1; 252 } 253 254 if (vdhcp_start && !inet_aton(vdhcp_start, &dhcp)) { 255 return -1; 256 } 257 if ((dhcp.s_addr & mask.s_addr) != net.s_addr || 258 dhcp.s_addr == host.s_addr || dhcp.s_addr == dns.s_addr) { 259 return -1; 260 } 261 262 #ifndef _WIN32 263 if (vsmbserver && !inet_aton(vsmbserver, &smbsrv)) { 264 return -1; 265 } 266 #endif 267 268 #if defined(_WIN32) && (_WIN32_WINNT < 0x0600) 269 /* No inet_pton helper before Vista... */ 270 if (vprefix6) { 271 /* Unsupported */ 272 return -1; 273 } 274 memset(&ip6_prefix, 0, sizeof(ip6_prefix)); 275 ip6_prefix.s6_addr[0] = 0xfe; 276 ip6_prefix.s6_addr[1] = 0xc0; 277 #else 278 if (!vprefix6) { 279 vprefix6 = "fec0::"; 280 } 281 if (!inet_pton(AF_INET6, vprefix6, &ip6_prefix)) { 282 return -1; 283 } 284 #endif 285 286 if (!vprefix6_len) { 287 vprefix6_len = 64; 288 } 289 if (vprefix6_len < 0 || vprefix6_len > 126) { 290 return -1; 291 } 292 293 if (vhost6) { 294 #if defined(_WIN32) && (_WIN32_WINNT < 0x0600) 295 return -1; 296 #else 297 if (!inet_pton(AF_INET6, vhost6, &ip6_host)) { 298 return -1; 299 } 300 if (!in6_equal_net(&ip6_prefix, &ip6_host, vprefix6_len)) { 301 return -1; 302 } 303 #endif 304 } else { 305 ip6_host = ip6_prefix; 306 ip6_host.s6_addr[15] |= 2; 307 } 308 309 if (vnameserver6) { 310 #if defined(_WIN32) && (_WIN32_WINNT < 0x0600) 311 return -1; 312 #else 313 if (!inet_pton(AF_INET6, vnameserver6, &ip6_dns)) { 314 return -1; 315 } 316 if (!in6_equal_net(&ip6_prefix, &ip6_dns, vprefix6_len)) { 317 return -1; 318 } 319 #endif 320 } else { 321 ip6_dns = ip6_prefix; 322 ip6_dns.s6_addr[15] |= 3; 323 } 324 325 326 nc = qemu_new_net_client(&net_slirp_info, peer, model, name); 327 328 snprintf(nc->info_str, sizeof(nc->info_str), 329 "net=%s,restrict=%s", inet_ntoa(net), 330 restricted ? "on" : "off"); 331 332 s = DO_UPCAST(SlirpState, nc, nc); 333 334 s->slirp = slirp_init(restricted, ipv4, net, mask, host, 335 ipv6, ip6_prefix, vprefix6_len, ip6_host, 336 vhostname, tftp_export, bootfile, dhcp, 337 dns, ip6_dns, dnssearch, s); 338 QTAILQ_INSERT_TAIL(&slirp_stacks, s, entry); 339 340 for (config = slirp_configs; config; config = config->next) { 341 if (config->flags & SLIRP_CFG_HOSTFWD) { 342 if (slirp_hostfwd(s, config->str, 343 config->flags & SLIRP_CFG_LEGACY) < 0) 344 goto error; 345 } else { 346 if (slirp_guestfwd(s, config->str, 347 config->flags & SLIRP_CFG_LEGACY) < 0) 348 goto error; 349 } 350 } 351 #ifndef _WIN32 352 if (!smb_export) { 353 smb_export = legacy_smb_export; 354 } 355 if (smb_export) { 356 if (slirp_smb(s, smb_export, smbsrv) < 0) 357 goto error; 358 } 359 #endif 360 361 s->exit_notifier.notify = slirp_smb_exit; 362 qemu_add_exit_notifier(&s->exit_notifier); 363 return 0; 364 365 error: 366 qemu_del_net_client(nc); 367 return -1; 368 } 369 370 static SlirpState *slirp_lookup(Monitor *mon, const char *vlan, 371 const char *stack) 372 { 373 374 if (vlan) { 375 NetClientState *nc; 376 nc = net_hub_find_client_by_name(strtol(vlan, NULL, 0), stack); 377 if (!nc) { 378 monitor_printf(mon, "unrecognized (vlan-id, stackname) pair\n"); 379 return NULL; 380 } 381 if (strcmp(nc->model, "user")) { 382 monitor_printf(mon, "invalid device specified\n"); 383 return NULL; 384 } 385 return DO_UPCAST(SlirpState, nc, nc); 386 } else { 387 if (QTAILQ_EMPTY(&slirp_stacks)) { 388 monitor_printf(mon, "user mode network stack not in use\n"); 389 return NULL; 390 } 391 return QTAILQ_FIRST(&slirp_stacks); 392 } 393 } 394 395 void hmp_hostfwd_remove(Monitor *mon, const QDict *qdict) 396 { 397 struct in_addr host_addr = { .s_addr = INADDR_ANY }; 398 int host_port; 399 char buf[256]; 400 const char *src_str, *p; 401 SlirpState *s; 402 int is_udp = 0; 403 int err; 404 const char *arg1 = qdict_get_str(qdict, "arg1"); 405 const char *arg2 = qdict_get_try_str(qdict, "arg2"); 406 const char *arg3 = qdict_get_try_str(qdict, "arg3"); 407 408 if (arg2) { 409 s = slirp_lookup(mon, arg1, arg2); 410 src_str = arg3; 411 } else { 412 s = slirp_lookup(mon, NULL, NULL); 413 src_str = arg1; 414 } 415 if (!s) { 416 return; 417 } 418 419 p = src_str; 420 if (!p || get_str_sep(buf, sizeof(buf), &p, ':') < 0) { 421 goto fail_syntax; 422 } 423 424 if (!strcmp(buf, "tcp") || buf[0] == '\0') { 425 is_udp = 0; 426 } else if (!strcmp(buf, "udp")) { 427 is_udp = 1; 428 } else { 429 goto fail_syntax; 430 } 431 432 if (get_str_sep(buf, sizeof(buf), &p, ':') < 0) { 433 goto fail_syntax; 434 } 435 if (buf[0] != '\0' && !inet_aton(buf, &host_addr)) { 436 goto fail_syntax; 437 } 438 439 host_port = atoi(p); 440 441 err = slirp_remove_hostfwd(s->slirp, is_udp, host_addr, host_port); 442 443 monitor_printf(mon, "host forwarding rule for %s %s\n", src_str, 444 err ? "not found" : "removed"); 445 return; 446 447 fail_syntax: 448 monitor_printf(mon, "invalid format\n"); 449 } 450 451 static int slirp_hostfwd(SlirpState *s, const char *redir_str, 452 int legacy_format) 453 { 454 struct in_addr host_addr = { .s_addr = INADDR_ANY }; 455 struct in_addr guest_addr = { .s_addr = 0 }; 456 int host_port, guest_port; 457 const char *p; 458 char buf[256]; 459 int is_udp; 460 char *end; 461 462 p = redir_str; 463 if (!p || get_str_sep(buf, sizeof(buf), &p, ':') < 0) { 464 goto fail_syntax; 465 } 466 if (!strcmp(buf, "tcp") || buf[0] == '\0') { 467 is_udp = 0; 468 } else if (!strcmp(buf, "udp")) { 469 is_udp = 1; 470 } else { 471 goto fail_syntax; 472 } 473 474 if (!legacy_format) { 475 if (get_str_sep(buf, sizeof(buf), &p, ':') < 0) { 476 goto fail_syntax; 477 } 478 if (buf[0] != '\0' && !inet_aton(buf, &host_addr)) { 479 goto fail_syntax; 480 } 481 } 482 483 if (get_str_sep(buf, sizeof(buf), &p, legacy_format ? ':' : '-') < 0) { 484 goto fail_syntax; 485 } 486 host_port = strtol(buf, &end, 0); 487 if (*end != '\0' || host_port < 1 || host_port > 65535) { 488 goto fail_syntax; 489 } 490 491 if (get_str_sep(buf, sizeof(buf), &p, ':') < 0) { 492 goto fail_syntax; 493 } 494 if (buf[0] != '\0' && !inet_aton(buf, &guest_addr)) { 495 goto fail_syntax; 496 } 497 498 guest_port = strtol(p, &end, 0); 499 if (*end != '\0' || guest_port < 1 || guest_port > 65535) { 500 goto fail_syntax; 501 } 502 503 if (slirp_add_hostfwd(s->slirp, is_udp, host_addr, host_port, guest_addr, 504 guest_port) < 0) { 505 error_report("could not set up host forwarding rule '%s'", 506 redir_str); 507 return -1; 508 } 509 return 0; 510 511 fail_syntax: 512 error_report("invalid host forwarding rule '%s'", redir_str); 513 return -1; 514 } 515 516 void hmp_hostfwd_add(Monitor *mon, const QDict *qdict) 517 { 518 const char *redir_str; 519 SlirpState *s; 520 const char *arg1 = qdict_get_str(qdict, "arg1"); 521 const char *arg2 = qdict_get_try_str(qdict, "arg2"); 522 const char *arg3 = qdict_get_try_str(qdict, "arg3"); 523 524 if (arg2) { 525 s = slirp_lookup(mon, arg1, arg2); 526 redir_str = arg3; 527 } else { 528 s = slirp_lookup(mon, NULL, NULL); 529 redir_str = arg1; 530 } 531 if (s) { 532 slirp_hostfwd(s, redir_str, 0); 533 } 534 535 } 536 537 int net_slirp_redir(const char *redir_str) 538 { 539 struct slirp_config_str *config; 540 541 if (QTAILQ_EMPTY(&slirp_stacks)) { 542 config = g_malloc(sizeof(*config)); 543 pstrcpy(config->str, sizeof(config->str), redir_str); 544 config->flags = SLIRP_CFG_HOSTFWD | SLIRP_CFG_LEGACY; 545 config->next = slirp_configs; 546 slirp_configs = config; 547 return 0; 548 } 549 550 return slirp_hostfwd(QTAILQ_FIRST(&slirp_stacks), redir_str, 1); 551 } 552 553 #ifndef _WIN32 554 555 /* automatic user mode samba server configuration */ 556 static void slirp_smb_cleanup(SlirpState *s) 557 { 558 char cmd[128]; 559 int ret; 560 561 if (s->smb_dir[0] != '\0') { 562 snprintf(cmd, sizeof(cmd), "rm -rf %s", s->smb_dir); 563 ret = system(cmd); 564 if (ret == -1 || !WIFEXITED(ret)) { 565 error_report("'%s' failed.", cmd); 566 } else if (WEXITSTATUS(ret)) { 567 error_report("'%s' failed. Error code: %d", 568 cmd, WEXITSTATUS(ret)); 569 } 570 s->smb_dir[0] = '\0'; 571 } 572 } 573 574 static int slirp_smb(SlirpState* s, const char *exported_dir, 575 struct in_addr vserver_addr) 576 { 577 char smb_conf[128]; 578 char smb_cmdline[128]; 579 struct passwd *passwd; 580 FILE *f; 581 582 passwd = getpwuid(geteuid()); 583 if (!passwd) { 584 error_report("failed to retrieve user name"); 585 return -1; 586 } 587 588 if (access(CONFIG_SMBD_COMMAND, F_OK)) { 589 error_report("could not find '%s', please install it", 590 CONFIG_SMBD_COMMAND); 591 return -1; 592 } 593 594 if (access(exported_dir, R_OK | X_OK)) { 595 error_report("error accessing shared directory '%s': %s", 596 exported_dir, strerror(errno)); 597 return -1; 598 } 599 600 snprintf(s->smb_dir, sizeof(s->smb_dir), "/tmp/qemu-smb.XXXXXX"); 601 if (!mkdtemp(s->smb_dir)) { 602 error_report("could not create samba server dir '%s'", s->smb_dir); 603 s->smb_dir[0] = 0; 604 return -1; 605 } 606 snprintf(smb_conf, sizeof(smb_conf), "%s/%s", s->smb_dir, "smb.conf"); 607 608 f = fopen(smb_conf, "w"); 609 if (!f) { 610 slirp_smb_cleanup(s); 611 error_report("could not create samba server configuration file '%s'", 612 smb_conf); 613 return -1; 614 } 615 fprintf(f, 616 "[global]\n" 617 "private dir=%s\n" 618 "interfaces=127.0.0.1\n" 619 "bind interfaces only=yes\n" 620 "pid directory=%s\n" 621 "lock directory=%s\n" 622 "state directory=%s\n" 623 "cache directory=%s\n" 624 "ncalrpc dir=%s/ncalrpc\n" 625 "log file=%s/log.smbd\n" 626 "smb passwd file=%s/smbpasswd\n" 627 "security = user\n" 628 "map to guest = Bad User\n" 629 "load printers = no\n" 630 "printing = bsd\n" 631 "disable spoolss = yes\n" 632 "usershare max shares = 0\n" 633 "[qemu]\n" 634 "path=%s\n" 635 "read only=no\n" 636 "guest ok=yes\n" 637 "force user=%s\n", 638 s->smb_dir, 639 s->smb_dir, 640 s->smb_dir, 641 s->smb_dir, 642 s->smb_dir, 643 s->smb_dir, 644 s->smb_dir, 645 s->smb_dir, 646 exported_dir, 647 passwd->pw_name 648 ); 649 fclose(f); 650 651 snprintf(smb_cmdline, sizeof(smb_cmdline), "%s -l %s -s %s", 652 CONFIG_SMBD_COMMAND, s->smb_dir, smb_conf); 653 654 if (slirp_add_exec(s->slirp, 0, smb_cmdline, &vserver_addr, 139) < 0 || 655 slirp_add_exec(s->slirp, 0, smb_cmdline, &vserver_addr, 445) < 0) { 656 slirp_smb_cleanup(s); 657 error_report("conflicting/invalid smbserver address"); 658 return -1; 659 } 660 return 0; 661 } 662 663 /* automatic user mode samba server configuration (legacy interface) */ 664 int net_slirp_smb(const char *exported_dir) 665 { 666 struct in_addr vserver_addr = { .s_addr = 0 }; 667 668 if (legacy_smb_export) { 669 fprintf(stderr, "-smb given twice\n"); 670 return -1; 671 } 672 legacy_smb_export = exported_dir; 673 if (!QTAILQ_EMPTY(&slirp_stacks)) { 674 return slirp_smb(QTAILQ_FIRST(&slirp_stacks), exported_dir, 675 vserver_addr); 676 } 677 return 0; 678 } 679 680 #endif /* !defined(_WIN32) */ 681 682 struct GuestFwd { 683 CharDriverState *hd; 684 struct in_addr server; 685 int port; 686 Slirp *slirp; 687 }; 688 689 static int guestfwd_can_read(void *opaque) 690 { 691 struct GuestFwd *fwd = opaque; 692 return slirp_socket_can_recv(fwd->slirp, fwd->server, fwd->port); 693 } 694 695 static void guestfwd_read(void *opaque, const uint8_t *buf, int size) 696 { 697 struct GuestFwd *fwd = opaque; 698 slirp_socket_recv(fwd->slirp, fwd->server, fwd->port, buf, size); 699 } 700 701 static int slirp_guestfwd(SlirpState *s, const char *config_str, 702 int legacy_format) 703 { 704 struct in_addr server = { .s_addr = 0 }; 705 struct GuestFwd *fwd; 706 const char *p; 707 char buf[128]; 708 char *end; 709 int port; 710 711 p = config_str; 712 if (legacy_format) { 713 if (get_str_sep(buf, sizeof(buf), &p, ':') < 0) { 714 goto fail_syntax; 715 } 716 } else { 717 if (get_str_sep(buf, sizeof(buf), &p, ':') < 0) { 718 goto fail_syntax; 719 } 720 if (strcmp(buf, "tcp") && buf[0] != '\0') { 721 goto fail_syntax; 722 } 723 if (get_str_sep(buf, sizeof(buf), &p, ':') < 0) { 724 goto fail_syntax; 725 } 726 if (buf[0] != '\0' && !inet_aton(buf, &server)) { 727 goto fail_syntax; 728 } 729 if (get_str_sep(buf, sizeof(buf), &p, '-') < 0) { 730 goto fail_syntax; 731 } 732 } 733 port = strtol(buf, &end, 10); 734 if (*end != '\0' || port < 1 || port > 65535) { 735 goto fail_syntax; 736 } 737 738 snprintf(buf, sizeof(buf), "guestfwd.tcp.%d", port); 739 740 if ((strlen(p) > 4) && !strncmp(p, "cmd:", 4)) { 741 if (slirp_add_exec(s->slirp, 0, &p[4], &server, port) < 0) { 742 error_report("conflicting/invalid host:port in guest forwarding " 743 "rule '%s'", config_str); 744 return -1; 745 } 746 } else { 747 fwd = g_new(struct GuestFwd, 1); 748 fwd->hd = qemu_chr_new(buf, p, NULL); 749 if (!fwd->hd) { 750 error_report("could not open guest forwarding device '%s'", buf); 751 g_free(fwd); 752 return -1; 753 } 754 755 if (slirp_add_exec(s->slirp, 3, fwd->hd, &server, port) < 0) { 756 error_report("conflicting/invalid host:port in guest forwarding " 757 "rule '%s'", config_str); 758 g_free(fwd); 759 return -1; 760 } 761 fwd->server = server; 762 fwd->port = port; 763 fwd->slirp = s->slirp; 764 765 qemu_chr_fe_claim_no_fail(fwd->hd); 766 qemu_chr_add_handlers(fwd->hd, guestfwd_can_read, guestfwd_read, 767 NULL, fwd); 768 } 769 return 0; 770 771 fail_syntax: 772 error_report("invalid guest forwarding rule '%s'", config_str); 773 return -1; 774 } 775 776 void hmp_info_usernet(Monitor *mon, const QDict *qdict) 777 { 778 SlirpState *s; 779 780 QTAILQ_FOREACH(s, &slirp_stacks, entry) { 781 int id; 782 bool got_vlan_id = net_hub_id_for_client(&s->nc, &id) == 0; 783 monitor_printf(mon, "VLAN %d (%s):\n", 784 got_vlan_id ? id : -1, 785 s->nc.name); 786 slirp_connection_info(s->slirp, mon); 787 } 788 } 789 790 static void 791 net_init_slirp_configs(const StringList *fwd, int flags) 792 { 793 while (fwd) { 794 struct slirp_config_str *config; 795 796 config = g_malloc0(sizeof(*config)); 797 pstrcpy(config->str, sizeof(config->str), fwd->value->str); 798 config->flags = flags; 799 config->next = slirp_configs; 800 slirp_configs = config; 801 802 fwd = fwd->next; 803 } 804 } 805 806 static const char **slirp_dnssearch(const StringList *dnsname) 807 { 808 const StringList *c = dnsname; 809 size_t i = 0, num_opts = 0; 810 const char **ret; 811 812 while (c) { 813 num_opts++; 814 c = c->next; 815 } 816 817 if (num_opts == 0) { 818 return NULL; 819 } 820 821 ret = g_malloc((num_opts + 1) * sizeof(*ret)); 822 c = dnsname; 823 while (c) { 824 ret[i++] = c->value->str; 825 c = c->next; 826 } 827 ret[i] = NULL; 828 return ret; 829 } 830 831 int net_init_slirp(const Netdev *netdev, const char *name, 832 NetClientState *peer, Error **errp) 833 { 834 /* FIXME error_setg(errp, ...) on failure */ 835 struct slirp_config_str *config; 836 char *vnet; 837 int ret; 838 const NetdevUserOptions *user; 839 const char **dnssearch; 840 bool ipv4 = true, ipv6 = true; 841 842 assert(netdev->type == NET_CLIENT_DRIVER_USER); 843 user = &netdev->u.user; 844 845 if ((user->has_ipv6 && user->ipv6 && !user->has_ipv4) || 846 (user->has_ipv4 && !user->ipv4)) { 847 ipv4 = 0; 848 } 849 if ((user->has_ipv4 && user->ipv4 && !user->has_ipv6) || 850 (user->has_ipv6 && !user->ipv6)) { 851 ipv6 = 0; 852 } 853 854 vnet = user->has_net ? g_strdup(user->net) : 855 user->has_ip ? g_strdup_printf("%s/24", user->ip) : 856 NULL; 857 858 dnssearch = slirp_dnssearch(user->dnssearch); 859 860 /* all optional fields are initialized to "all bits zero" */ 861 862 net_init_slirp_configs(user->hostfwd, SLIRP_CFG_HOSTFWD); 863 net_init_slirp_configs(user->guestfwd, 0); 864 865 ret = net_slirp_init(peer, "user", name, user->q_restrict, 866 ipv4, vnet, user->host, 867 ipv6, user->ipv6_prefix, user->ipv6_prefixlen, 868 user->ipv6_host, user->hostname, user->tftp, 869 user->bootfile, user->dhcpstart, 870 user->dns, user->ipv6_dns, user->smb, 871 user->smbserver, dnssearch); 872 873 while (slirp_configs) { 874 config = slirp_configs; 875 slirp_configs = config->next; 876 g_free(config); 877 } 878 879 g_free(vnet); 880 g_free(dnssearch); 881 882 return ret; 883 } 884 885 int net_slirp_parse_legacy(QemuOptsList *opts_list, const char *optarg, int *ret) 886 { 887 if (strcmp(opts_list->name, "net") != 0 || 888 strncmp(optarg, "channel,", strlen("channel,")) != 0) { 889 return 0; 890 } 891 892 error_report("The '-net channel' option is deprecated. " 893 "Please use '-netdev user,guestfwd=...' instead."); 894 895 /* handle legacy -net channel,port:chr */ 896 optarg += strlen("channel,"); 897 898 if (QTAILQ_EMPTY(&slirp_stacks)) { 899 struct slirp_config_str *config; 900 901 config = g_malloc(sizeof(*config)); 902 pstrcpy(config->str, sizeof(config->str), optarg); 903 config->flags = SLIRP_CFG_LEGACY; 904 config->next = slirp_configs; 905 slirp_configs = config; 906 *ret = 0; 907 } else { 908 *ret = slirp_guestfwd(QTAILQ_FIRST(&slirp_stacks), optarg, 1); 909 } 910 911 return 1; 912 } 913 914