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 "chardev/char-fe.h" 41 #include "sysemu/sysemu.h" 42 #include "qemu/cutils.h" 43 #include "qapi/error.h" 44 45 static int get_str_sep(char *buf, int buf_size, const char **pp, int sep) 46 { 47 const char *p, *p1; 48 int len; 49 p = *pp; 50 p1 = strchr(p, sep); 51 if (!p1) 52 return -1; 53 len = p1 - p; 54 p1++; 55 if (buf_size > 0) { 56 if (len > buf_size - 1) 57 len = buf_size - 1; 58 memcpy(buf, p, len); 59 buf[len] = '\0'; 60 } 61 *pp = p1; 62 return 0; 63 } 64 65 /* slirp network adapter */ 66 67 #define SLIRP_CFG_HOSTFWD 1 68 #define SLIRP_CFG_LEGACY 2 69 70 struct slirp_config_str { 71 struct slirp_config_str *next; 72 int flags; 73 char str[1024]; 74 int legacy_format; 75 }; 76 77 typedef struct SlirpState { 78 NetClientState nc; 79 QTAILQ_ENTRY(SlirpState) entry; 80 Slirp *slirp; 81 Notifier exit_notifier; 82 #ifndef _WIN32 83 gchar *smb_dir; 84 #endif 85 } SlirpState; 86 87 static struct slirp_config_str *slirp_configs; 88 const char *legacy_tftp_prefix; 89 const char *legacy_bootp_filename; 90 static QTAILQ_HEAD(slirp_stacks, SlirpState) slirp_stacks = 91 QTAILQ_HEAD_INITIALIZER(slirp_stacks); 92 93 static int slirp_hostfwd(SlirpState *s, const char *redir_str, 94 int legacy_format); 95 static int slirp_guestfwd(SlirpState *s, const char *config_str, 96 int legacy_format); 97 98 #ifndef _WIN32 99 static const char *legacy_smb_export; 100 101 static int slirp_smb(SlirpState *s, const char *exported_dir, 102 struct in_addr vserver_addr); 103 static void slirp_smb_cleanup(SlirpState *s); 104 #else 105 static inline void slirp_smb_cleanup(SlirpState *s) { } 106 #endif 107 108 void slirp_output(void *opaque, const uint8_t *pkt, int pkt_len) 109 { 110 SlirpState *s = opaque; 111 112 qemu_send_packet(&s->nc, pkt, pkt_len); 113 } 114 115 static ssize_t net_slirp_receive(NetClientState *nc, const uint8_t *buf, size_t size) 116 { 117 SlirpState *s = DO_UPCAST(SlirpState, nc, nc); 118 119 slirp_input(s->slirp, buf, size); 120 121 return size; 122 } 123 124 static void slirp_smb_exit(Notifier *n, void *data) 125 { 126 SlirpState *s = container_of(n, SlirpState, exit_notifier); 127 slirp_smb_cleanup(s); 128 } 129 130 static void net_slirp_cleanup(NetClientState *nc) 131 { 132 SlirpState *s = DO_UPCAST(SlirpState, nc, nc); 133 134 slirp_cleanup(s->slirp); 135 if (s->exit_notifier.notify) { 136 qemu_remove_exit_notifier(&s->exit_notifier); 137 } 138 slirp_smb_cleanup(s); 139 QTAILQ_REMOVE(&slirp_stacks, s, entry); 140 } 141 142 static NetClientInfo net_slirp_info = { 143 .type = NET_CLIENT_DRIVER_USER, 144 .size = sizeof(SlirpState), 145 .receive = net_slirp_receive, 146 .cleanup = net_slirp_cleanup, 147 }; 148 149 static int net_slirp_init(NetClientState *peer, const char *model, 150 const char *name, int restricted, 151 bool ipv4, const char *vnetwork, const char *vhost, 152 bool ipv6, const char *vprefix6, int vprefix6_len, 153 const char *vhost6, 154 const char *vhostname, const char *tftp_export, 155 const char *bootfile, const char *vdhcp_start, 156 const char *vnameserver, const char *vnameserver6, 157 const char *smb_export, const char *vsmbserver, 158 const char **dnssearch) 159 { 160 /* default settings according to historic slirp */ 161 struct in_addr net = { .s_addr = htonl(0x0a000200) }; /* 10.0.2.0 */ 162 struct in_addr mask = { .s_addr = htonl(0xffffff00) }; /* 255.255.255.0 */ 163 struct in_addr host = { .s_addr = htonl(0x0a000202) }; /* 10.0.2.2 */ 164 struct in_addr dhcp = { .s_addr = htonl(0x0a00020f) }; /* 10.0.2.15 */ 165 struct in_addr dns = { .s_addr = htonl(0x0a000203) }; /* 10.0.2.3 */ 166 struct in6_addr ip6_prefix; 167 struct in6_addr ip6_host; 168 struct in6_addr ip6_dns; 169 #ifndef _WIN32 170 struct in_addr smbsrv = { .s_addr = 0 }; 171 #endif 172 NetClientState *nc; 173 SlirpState *s; 174 char buf[20]; 175 uint32_t addr; 176 int shift; 177 char *end; 178 struct slirp_config_str *config; 179 180 if (!ipv4 && (vnetwork || vhost || vnameserver)) { 181 return -1; 182 } 183 184 if (!ipv6 && (vprefix6 || vhost6 || vnameserver6)) { 185 return -1; 186 } 187 188 if (!ipv4 && !ipv6) { 189 /* It doesn't make sense to disable both */ 190 return -1; 191 } 192 193 if (!tftp_export) { 194 tftp_export = legacy_tftp_prefix; 195 } 196 if (!bootfile) { 197 bootfile = legacy_bootp_filename; 198 } 199 200 if (vnetwork) { 201 if (get_str_sep(buf, sizeof(buf), &vnetwork, '/') < 0) { 202 if (!inet_aton(vnetwork, &net)) { 203 return -1; 204 } 205 addr = ntohl(net.s_addr); 206 if (!(addr & 0x80000000)) { 207 mask.s_addr = htonl(0xff000000); /* class A */ 208 } else if ((addr & 0xfff00000) == 0xac100000) { 209 mask.s_addr = htonl(0xfff00000); /* priv. 172.16.0.0/12 */ 210 } else if ((addr & 0xc0000000) == 0x80000000) { 211 mask.s_addr = htonl(0xffff0000); /* class B */ 212 } else if ((addr & 0xffff0000) == 0xc0a80000) { 213 mask.s_addr = htonl(0xffff0000); /* priv. 192.168.0.0/16 */ 214 } else if ((addr & 0xffff0000) == 0xc6120000) { 215 mask.s_addr = htonl(0xfffe0000); /* tests 198.18.0.0/15 */ 216 } else if ((addr & 0xe0000000) == 0xe0000000) { 217 mask.s_addr = htonl(0xffffff00); /* class C */ 218 } else { 219 mask.s_addr = htonl(0xfffffff0); /* multicast/reserved */ 220 } 221 } else { 222 if (!inet_aton(buf, &net)) { 223 return -1; 224 } 225 shift = strtol(vnetwork, &end, 10); 226 if (*end != '\0') { 227 if (!inet_aton(vnetwork, &mask)) { 228 return -1; 229 } 230 } else if (shift < 4 || shift > 32) { 231 return -1; 232 } else { 233 mask.s_addr = htonl(0xffffffff << (32 - shift)); 234 } 235 } 236 net.s_addr &= mask.s_addr; 237 host.s_addr = net.s_addr | (htonl(0x0202) & ~mask.s_addr); 238 dhcp.s_addr = net.s_addr | (htonl(0x020f) & ~mask.s_addr); 239 dns.s_addr = net.s_addr | (htonl(0x0203) & ~mask.s_addr); 240 } 241 242 if (vhost && !inet_aton(vhost, &host)) { 243 return -1; 244 } 245 if ((host.s_addr & mask.s_addr) != net.s_addr) { 246 return -1; 247 } 248 249 if (vnameserver && !inet_aton(vnameserver, &dns)) { 250 return -1; 251 } 252 if ((dns.s_addr & mask.s_addr) != net.s_addr || 253 dns.s_addr == host.s_addr) { 254 return -1; 255 } 256 257 if (vdhcp_start && !inet_aton(vdhcp_start, &dhcp)) { 258 return -1; 259 } 260 if ((dhcp.s_addr & mask.s_addr) != net.s_addr || 261 dhcp.s_addr == host.s_addr || dhcp.s_addr == dns.s_addr) { 262 return -1; 263 } 264 265 #ifndef _WIN32 266 if (vsmbserver && !inet_aton(vsmbserver, &smbsrv)) { 267 return -1; 268 } 269 #endif 270 271 #if defined(_WIN32) && (_WIN32_WINNT < 0x0600) 272 /* No inet_pton helper before Vista... */ 273 if (vprefix6) { 274 /* Unsupported */ 275 return -1; 276 } 277 memset(&ip6_prefix, 0, sizeof(ip6_prefix)); 278 ip6_prefix.s6_addr[0] = 0xfe; 279 ip6_prefix.s6_addr[1] = 0xc0; 280 #else 281 if (!vprefix6) { 282 vprefix6 = "fec0::"; 283 } 284 if (!inet_pton(AF_INET6, vprefix6, &ip6_prefix)) { 285 return -1; 286 } 287 #endif 288 289 if (!vprefix6_len) { 290 vprefix6_len = 64; 291 } 292 if (vprefix6_len < 0 || vprefix6_len > 126) { 293 return -1; 294 } 295 296 if (vhost6) { 297 #if defined(_WIN32) && (_WIN32_WINNT < 0x0600) 298 return -1; 299 #else 300 if (!inet_pton(AF_INET6, vhost6, &ip6_host)) { 301 return -1; 302 } 303 if (!in6_equal_net(&ip6_prefix, &ip6_host, vprefix6_len)) { 304 return -1; 305 } 306 #endif 307 } else { 308 ip6_host = ip6_prefix; 309 ip6_host.s6_addr[15] |= 2; 310 } 311 312 if (vnameserver6) { 313 #if defined(_WIN32) && (_WIN32_WINNT < 0x0600) 314 return -1; 315 #else 316 if (!inet_pton(AF_INET6, vnameserver6, &ip6_dns)) { 317 return -1; 318 } 319 if (!in6_equal_net(&ip6_prefix, &ip6_dns, vprefix6_len)) { 320 return -1; 321 } 322 #endif 323 } else { 324 ip6_dns = ip6_prefix; 325 ip6_dns.s6_addr[15] |= 3; 326 } 327 328 329 nc = qemu_new_net_client(&net_slirp_info, peer, model, name); 330 331 snprintf(nc->info_str, sizeof(nc->info_str), 332 "net=%s,restrict=%s", inet_ntoa(net), 333 restricted ? "on" : "off"); 334 335 s = DO_UPCAST(SlirpState, nc, nc); 336 337 s->slirp = slirp_init(restricted, ipv4, net, mask, host, 338 ipv6, ip6_prefix, vprefix6_len, ip6_host, 339 vhostname, tftp_export, bootfile, dhcp, 340 dns, ip6_dns, dnssearch, s); 341 QTAILQ_INSERT_TAIL(&slirp_stacks, s, entry); 342 343 for (config = slirp_configs; config; config = config->next) { 344 if (config->flags & SLIRP_CFG_HOSTFWD) { 345 if (slirp_hostfwd(s, config->str, 346 config->flags & SLIRP_CFG_LEGACY) < 0) 347 goto error; 348 } else { 349 if (slirp_guestfwd(s, config->str, 350 config->flags & SLIRP_CFG_LEGACY) < 0) 351 goto error; 352 } 353 } 354 #ifndef _WIN32 355 if (!smb_export) { 356 smb_export = legacy_smb_export; 357 } 358 if (smb_export) { 359 if (slirp_smb(s, smb_export, smbsrv) < 0) 360 goto error; 361 } 362 #endif 363 364 s->exit_notifier.notify = slirp_smb_exit; 365 qemu_add_exit_notifier(&s->exit_notifier); 366 return 0; 367 368 error: 369 qemu_del_net_client(nc); 370 return -1; 371 } 372 373 static SlirpState *slirp_lookup(Monitor *mon, const char *vlan, 374 const char *stack) 375 { 376 377 if (vlan) { 378 NetClientState *nc; 379 nc = net_hub_find_client_by_name(strtol(vlan, NULL, 0), stack); 380 if (!nc) { 381 monitor_printf(mon, "unrecognized (vlan-id, stackname) pair\n"); 382 return NULL; 383 } 384 if (strcmp(nc->model, "user")) { 385 monitor_printf(mon, "invalid device specified\n"); 386 return NULL; 387 } 388 return DO_UPCAST(SlirpState, nc, nc); 389 } else { 390 if (QTAILQ_EMPTY(&slirp_stacks)) { 391 monitor_printf(mon, "user mode network stack not in use\n"); 392 return NULL; 393 } 394 return QTAILQ_FIRST(&slirp_stacks); 395 } 396 } 397 398 void hmp_hostfwd_remove(Monitor *mon, const QDict *qdict) 399 { 400 struct in_addr host_addr = { .s_addr = INADDR_ANY }; 401 int host_port; 402 char buf[256]; 403 const char *src_str, *p; 404 SlirpState *s; 405 int is_udp = 0; 406 int err; 407 const char *arg1 = qdict_get_str(qdict, "arg1"); 408 const char *arg2 = qdict_get_try_str(qdict, "arg2"); 409 const char *arg3 = qdict_get_try_str(qdict, "arg3"); 410 411 if (arg2) { 412 s = slirp_lookup(mon, arg1, arg2); 413 src_str = arg3; 414 } else { 415 s = slirp_lookup(mon, NULL, NULL); 416 src_str = arg1; 417 } 418 if (!s) { 419 return; 420 } 421 422 p = src_str; 423 if (!p || get_str_sep(buf, sizeof(buf), &p, ':') < 0) { 424 goto fail_syntax; 425 } 426 427 if (!strcmp(buf, "tcp") || buf[0] == '\0') { 428 is_udp = 0; 429 } else if (!strcmp(buf, "udp")) { 430 is_udp = 1; 431 } else { 432 goto fail_syntax; 433 } 434 435 if (get_str_sep(buf, sizeof(buf), &p, ':') < 0) { 436 goto fail_syntax; 437 } 438 if (buf[0] != '\0' && !inet_aton(buf, &host_addr)) { 439 goto fail_syntax; 440 } 441 442 host_port = atoi(p); 443 444 err = slirp_remove_hostfwd(s->slirp, is_udp, host_addr, host_port); 445 446 monitor_printf(mon, "host forwarding rule for %s %s\n", src_str, 447 err ? "not found" : "removed"); 448 return; 449 450 fail_syntax: 451 monitor_printf(mon, "invalid format\n"); 452 } 453 454 static int slirp_hostfwd(SlirpState *s, const char *redir_str, 455 int legacy_format) 456 { 457 struct in_addr host_addr = { .s_addr = INADDR_ANY }; 458 struct in_addr guest_addr = { .s_addr = 0 }; 459 int host_port, guest_port; 460 const char *p; 461 char buf[256]; 462 int is_udp; 463 char *end; 464 465 p = redir_str; 466 if (!p || get_str_sep(buf, sizeof(buf), &p, ':') < 0) { 467 goto fail_syntax; 468 } 469 if (!strcmp(buf, "tcp") || buf[0] == '\0') { 470 is_udp = 0; 471 } else if (!strcmp(buf, "udp")) { 472 is_udp = 1; 473 } else { 474 goto fail_syntax; 475 } 476 477 if (!legacy_format) { 478 if (get_str_sep(buf, sizeof(buf), &p, ':') < 0) { 479 goto fail_syntax; 480 } 481 if (buf[0] != '\0' && !inet_aton(buf, &host_addr)) { 482 goto fail_syntax; 483 } 484 } 485 486 if (get_str_sep(buf, sizeof(buf), &p, legacy_format ? ':' : '-') < 0) { 487 goto fail_syntax; 488 } 489 host_port = strtol(buf, &end, 0); 490 if (*end != '\0' || host_port < 0 || host_port > 65535) { 491 goto fail_syntax; 492 } 493 494 if (get_str_sep(buf, sizeof(buf), &p, ':') < 0) { 495 goto fail_syntax; 496 } 497 if (buf[0] != '\0' && !inet_aton(buf, &guest_addr)) { 498 goto fail_syntax; 499 } 500 501 guest_port = strtol(p, &end, 0); 502 if (*end != '\0' || guest_port < 1 || guest_port > 65535) { 503 goto fail_syntax; 504 } 505 506 if (slirp_add_hostfwd(s->slirp, is_udp, host_addr, host_port, guest_addr, 507 guest_port) < 0) { 508 error_report("could not set up host forwarding rule '%s'", 509 redir_str); 510 return -1; 511 } 512 return 0; 513 514 fail_syntax: 515 error_report("invalid host forwarding rule '%s'", redir_str); 516 return -1; 517 } 518 519 void hmp_hostfwd_add(Monitor *mon, const QDict *qdict) 520 { 521 const char *redir_str; 522 SlirpState *s; 523 const char *arg1 = qdict_get_str(qdict, "arg1"); 524 const char *arg2 = qdict_get_try_str(qdict, "arg2"); 525 const char *arg3 = qdict_get_try_str(qdict, "arg3"); 526 527 if (arg2) { 528 s = slirp_lookup(mon, arg1, arg2); 529 redir_str = arg3; 530 } else { 531 s = slirp_lookup(mon, NULL, NULL); 532 redir_str = arg1; 533 } 534 if (s) { 535 slirp_hostfwd(s, redir_str, 0); 536 } 537 538 } 539 540 int net_slirp_redir(const char *redir_str) 541 { 542 struct slirp_config_str *config; 543 544 if (QTAILQ_EMPTY(&slirp_stacks)) { 545 config = g_malloc(sizeof(*config)); 546 pstrcpy(config->str, sizeof(config->str), redir_str); 547 config->flags = SLIRP_CFG_HOSTFWD | SLIRP_CFG_LEGACY; 548 config->next = slirp_configs; 549 slirp_configs = config; 550 return 0; 551 } 552 553 return slirp_hostfwd(QTAILQ_FIRST(&slirp_stacks), redir_str, 1); 554 } 555 556 #ifndef _WIN32 557 558 /* automatic user mode samba server configuration */ 559 static void slirp_smb_cleanup(SlirpState *s) 560 { 561 int ret; 562 563 if (s->smb_dir) { 564 gchar *cmd = g_strdup_printf("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 g_free(cmd); 573 g_free(s->smb_dir); 574 s->smb_dir = NULL; 575 } 576 } 577 578 static int slirp_smb(SlirpState* s, const char *exported_dir, 579 struct in_addr vserver_addr) 580 { 581 char *smb_conf; 582 char *smb_cmdline; 583 struct passwd *passwd; 584 FILE *f; 585 586 passwd = getpwuid(geteuid()); 587 if (!passwd) { 588 error_report("failed to retrieve user name"); 589 return -1; 590 } 591 592 if (access(CONFIG_SMBD_COMMAND, F_OK)) { 593 error_report("could not find '%s', please install it", 594 CONFIG_SMBD_COMMAND); 595 return -1; 596 } 597 598 if (access(exported_dir, R_OK | X_OK)) { 599 error_report("error accessing shared directory '%s': %s", 600 exported_dir, strerror(errno)); 601 return -1; 602 } 603 604 s->smb_dir = g_dir_make_tmp("qemu-smb.XXXXXX", NULL); 605 if (!s->smb_dir) { 606 error_report("could not create samba server dir"); 607 return -1; 608 } 609 smb_conf = g_strdup_printf("%s/%s", s->smb_dir, "smb.conf"); 610 611 f = fopen(smb_conf, "w"); 612 if (!f) { 613 slirp_smb_cleanup(s); 614 error_report("could not create samba server configuration file '%s'", 615 smb_conf); 616 g_free(smb_conf); 617 return -1; 618 } 619 fprintf(f, 620 "[global]\n" 621 "private dir=%s\n" 622 "interfaces=127.0.0.1\n" 623 "bind interfaces only=yes\n" 624 "pid directory=%s\n" 625 "lock directory=%s\n" 626 "state directory=%s\n" 627 "cache directory=%s\n" 628 "ncalrpc dir=%s/ncalrpc\n" 629 "log file=%s/log.smbd\n" 630 "smb passwd file=%s/smbpasswd\n" 631 "security = user\n" 632 "map to guest = Bad User\n" 633 "load printers = no\n" 634 "printing = bsd\n" 635 "disable spoolss = yes\n" 636 "usershare max shares = 0\n" 637 "[qemu]\n" 638 "path=%s\n" 639 "read only=no\n" 640 "guest ok=yes\n" 641 "force user=%s\n", 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 s->smb_dir, 649 s->smb_dir, 650 exported_dir, 651 passwd->pw_name 652 ); 653 fclose(f); 654 655 smb_cmdline = g_strdup_printf("%s -l %s -s %s", 656 CONFIG_SMBD_COMMAND, s->smb_dir, smb_conf); 657 g_free(smb_conf); 658 659 if (slirp_add_exec(s->slirp, 0, smb_cmdline, &vserver_addr, 139) < 0 || 660 slirp_add_exec(s->slirp, 0, smb_cmdline, &vserver_addr, 445) < 0) { 661 slirp_smb_cleanup(s); 662 g_free(smb_cmdline); 663 error_report("conflicting/invalid smbserver address"); 664 return -1; 665 } 666 g_free(smb_cmdline); 667 return 0; 668 } 669 670 /* automatic user mode samba server configuration (legacy interface) */ 671 int net_slirp_smb(const char *exported_dir) 672 { 673 struct in_addr vserver_addr = { .s_addr = 0 }; 674 675 if (legacy_smb_export) { 676 fprintf(stderr, "-smb given twice\n"); 677 return -1; 678 } 679 legacy_smb_export = exported_dir; 680 if (!QTAILQ_EMPTY(&slirp_stacks)) { 681 return slirp_smb(QTAILQ_FIRST(&slirp_stacks), exported_dir, 682 vserver_addr); 683 } 684 return 0; 685 } 686 687 #endif /* !defined(_WIN32) */ 688 689 struct GuestFwd { 690 CharBackend hd; 691 struct in_addr server; 692 int port; 693 Slirp *slirp; 694 }; 695 696 static int guestfwd_can_read(void *opaque) 697 { 698 struct GuestFwd *fwd = opaque; 699 return slirp_socket_can_recv(fwd->slirp, fwd->server, fwd->port); 700 } 701 702 static void guestfwd_read(void *opaque, const uint8_t *buf, int size) 703 { 704 struct GuestFwd *fwd = opaque; 705 slirp_socket_recv(fwd->slirp, fwd->server, fwd->port, buf, size); 706 } 707 708 static int slirp_guestfwd(SlirpState *s, const char *config_str, 709 int legacy_format) 710 { 711 struct in_addr server = { .s_addr = 0 }; 712 struct GuestFwd *fwd; 713 const char *p; 714 char buf[128]; 715 char *end; 716 int port; 717 718 p = config_str; 719 if (legacy_format) { 720 if (get_str_sep(buf, sizeof(buf), &p, ':') < 0) { 721 goto fail_syntax; 722 } 723 } else { 724 if (get_str_sep(buf, sizeof(buf), &p, ':') < 0) { 725 goto fail_syntax; 726 } 727 if (strcmp(buf, "tcp") && buf[0] != '\0') { 728 goto fail_syntax; 729 } 730 if (get_str_sep(buf, sizeof(buf), &p, ':') < 0) { 731 goto fail_syntax; 732 } 733 if (buf[0] != '\0' && !inet_aton(buf, &server)) { 734 goto fail_syntax; 735 } 736 if (get_str_sep(buf, sizeof(buf), &p, '-') < 0) { 737 goto fail_syntax; 738 } 739 } 740 port = strtol(buf, &end, 10); 741 if (*end != '\0' || port < 1 || port > 65535) { 742 goto fail_syntax; 743 } 744 745 snprintf(buf, sizeof(buf), "guestfwd.tcp.%d", port); 746 747 if ((strlen(p) > 4) && !strncmp(p, "cmd:", 4)) { 748 if (slirp_add_exec(s->slirp, 0, &p[4], &server, port) < 0) { 749 error_report("conflicting/invalid host:port in guest forwarding " 750 "rule '%s'", config_str); 751 return -1; 752 } 753 } else { 754 Error *err = NULL; 755 Chardev *chr = qemu_chr_new(buf, p); 756 757 if (!chr) { 758 error_report("could not open guest forwarding device '%s'", buf); 759 return -1; 760 } 761 762 fwd = g_new(struct GuestFwd, 1); 763 qemu_chr_fe_init(&fwd->hd, chr, &err); 764 if (err) { 765 error_report_err(err); 766 g_free(fwd); 767 return -1; 768 } 769 770 if (slirp_add_exec(s->slirp, 3, &fwd->hd, &server, port) < 0) { 771 error_report("conflicting/invalid host:port in guest forwarding " 772 "rule '%s'", config_str); 773 g_free(fwd); 774 return -1; 775 } 776 fwd->server = server; 777 fwd->port = port; 778 fwd->slirp = s->slirp; 779 780 qemu_chr_fe_set_handlers(&fwd->hd, guestfwd_can_read, guestfwd_read, 781 NULL, NULL, fwd, NULL, true); 782 } 783 return 0; 784 785 fail_syntax: 786 error_report("invalid guest forwarding rule '%s'", config_str); 787 return -1; 788 } 789 790 void hmp_info_usernet(Monitor *mon, const QDict *qdict) 791 { 792 SlirpState *s; 793 794 QTAILQ_FOREACH(s, &slirp_stacks, entry) { 795 int id; 796 bool got_vlan_id = net_hub_id_for_client(&s->nc, &id) == 0; 797 monitor_printf(mon, "VLAN %d (%s):\n", 798 got_vlan_id ? id : -1, 799 s->nc.name); 800 slirp_connection_info(s->slirp, mon); 801 } 802 } 803 804 static void 805 net_init_slirp_configs(const StringList *fwd, int flags) 806 { 807 while (fwd) { 808 struct slirp_config_str *config; 809 810 config = g_malloc0(sizeof(*config)); 811 pstrcpy(config->str, sizeof(config->str), fwd->value->str); 812 config->flags = flags; 813 config->next = slirp_configs; 814 slirp_configs = config; 815 816 fwd = fwd->next; 817 } 818 } 819 820 static const char **slirp_dnssearch(const StringList *dnsname) 821 { 822 const StringList *c = dnsname; 823 size_t i = 0, num_opts = 0; 824 const char **ret; 825 826 while (c) { 827 num_opts++; 828 c = c->next; 829 } 830 831 if (num_opts == 0) { 832 return NULL; 833 } 834 835 ret = g_malloc((num_opts + 1) * sizeof(*ret)); 836 c = dnsname; 837 while (c) { 838 ret[i++] = c->value->str; 839 c = c->next; 840 } 841 ret[i] = NULL; 842 return ret; 843 } 844 845 int net_init_slirp(const Netdev *netdev, const char *name, 846 NetClientState *peer, Error **errp) 847 { 848 /* FIXME error_setg(errp, ...) on failure */ 849 struct slirp_config_str *config; 850 char *vnet; 851 int ret; 852 const NetdevUserOptions *user; 853 const char **dnssearch; 854 bool ipv4 = true, ipv6 = true; 855 856 assert(netdev->type == NET_CLIENT_DRIVER_USER); 857 user = &netdev->u.user; 858 859 if ((user->has_ipv6 && user->ipv6 && !user->has_ipv4) || 860 (user->has_ipv4 && !user->ipv4)) { 861 ipv4 = 0; 862 } 863 if ((user->has_ipv4 && user->ipv4 && !user->has_ipv6) || 864 (user->has_ipv6 && !user->ipv6)) { 865 ipv6 = 0; 866 } 867 868 vnet = user->has_net ? g_strdup(user->net) : 869 user->has_ip ? g_strdup_printf("%s/24", user->ip) : 870 NULL; 871 872 dnssearch = slirp_dnssearch(user->dnssearch); 873 874 /* all optional fields are initialized to "all bits zero" */ 875 876 net_init_slirp_configs(user->hostfwd, SLIRP_CFG_HOSTFWD); 877 net_init_slirp_configs(user->guestfwd, 0); 878 879 ret = net_slirp_init(peer, "user", name, user->q_restrict, 880 ipv4, vnet, user->host, 881 ipv6, user->ipv6_prefix, user->ipv6_prefixlen, 882 user->ipv6_host, user->hostname, user->tftp, 883 user->bootfile, user->dhcpstart, 884 user->dns, user->ipv6_dns, user->smb, 885 user->smbserver, dnssearch); 886 887 while (slirp_configs) { 888 config = slirp_configs; 889 slirp_configs = config->next; 890 g_free(config); 891 } 892 893 g_free(vnet); 894 g_free(dnssearch); 895 896 return ret; 897 } 898 899 int net_slirp_parse_legacy(QemuOptsList *opts_list, const char *optarg, int *ret) 900 { 901 if (strcmp(opts_list->name, "net") != 0 || 902 strncmp(optarg, "channel,", strlen("channel,")) != 0) { 903 return 0; 904 } 905 906 error_report("The '-net channel' option is deprecated. " 907 "Please use '-netdev user,guestfwd=...' instead."); 908 909 /* handle legacy -net channel,port:chr */ 910 optarg += strlen("channel,"); 911 912 if (QTAILQ_EMPTY(&slirp_stacks)) { 913 struct slirp_config_str *config; 914 915 config = g_malloc(sizeof(*config)); 916 pstrcpy(config->str, sizeof(config->str), optarg); 917 config->flags = SLIRP_CFG_LEGACY; 918 config->next = slirp_configs; 919 slirp_configs = config; 920 *ret = 0; 921 } else { 922 *ret = slirp_guestfwd(QTAILQ_FIRST(&slirp_stacks), optarg, 1); 923 } 924 925 return 1; 926 } 927 928