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