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 42 static int get_str_sep(char *buf, int buf_size, const char **pp, int sep) 43 { 44 const char *p, *p1; 45 int len; 46 p = *pp; 47 p1 = strchr(p, sep); 48 if (!p1) 49 return -1; 50 len = p1 - p; 51 p1++; 52 if (buf_size > 0) { 53 if (len > buf_size - 1) 54 len = buf_size - 1; 55 memcpy(buf, p, len); 56 buf[len] = '\0'; 57 } 58 *pp = p1; 59 return 0; 60 } 61 62 /* slirp network adapter */ 63 64 #define SLIRP_CFG_HOSTFWD 1 65 #define SLIRP_CFG_LEGACY 2 66 67 struct slirp_config_str { 68 struct slirp_config_str *next; 69 int flags; 70 char str[1024]; 71 int legacy_format; 72 }; 73 74 typedef struct SlirpState { 75 NetClientState nc; 76 QTAILQ_ENTRY(SlirpState) entry; 77 Slirp *slirp; 78 #ifndef _WIN32 79 char smb_dir[128]; 80 #endif 81 } SlirpState; 82 83 static struct slirp_config_str *slirp_configs; 84 const char *legacy_tftp_prefix; 85 const char *legacy_bootp_filename; 86 static QTAILQ_HEAD(slirp_stacks, SlirpState) slirp_stacks = 87 QTAILQ_HEAD_INITIALIZER(slirp_stacks); 88 89 static int slirp_hostfwd(SlirpState *s, const char *redir_str, 90 int legacy_format); 91 static int slirp_guestfwd(SlirpState *s, const char *config_str, 92 int legacy_format); 93 94 #ifndef _WIN32 95 static const char *legacy_smb_export; 96 97 static int slirp_smb(SlirpState *s, const char *exported_dir, 98 struct in_addr vserver_addr); 99 static void slirp_smb_cleanup(SlirpState *s); 100 #else 101 static inline void slirp_smb_cleanup(SlirpState *s) { } 102 #endif 103 104 void slirp_output(void *opaque, const uint8_t *pkt, int pkt_len) 105 { 106 SlirpState *s = opaque; 107 108 qemu_send_packet(&s->nc, pkt, pkt_len); 109 } 110 111 static ssize_t net_slirp_receive(NetClientState *nc, const uint8_t *buf, size_t size) 112 { 113 SlirpState *s = DO_UPCAST(SlirpState, nc, nc); 114 115 slirp_input(s->slirp, buf, size); 116 117 return size; 118 } 119 120 static void net_slirp_cleanup(NetClientState *nc) 121 { 122 SlirpState *s = DO_UPCAST(SlirpState, nc, nc); 123 124 slirp_cleanup(s->slirp); 125 slirp_smb_cleanup(s); 126 QTAILQ_REMOVE(&slirp_stacks, s, entry); 127 } 128 129 static NetClientInfo net_slirp_info = { 130 .type = NET_CLIENT_OPTIONS_KIND_USER, 131 .size = sizeof(SlirpState), 132 .receive = net_slirp_receive, 133 .cleanup = net_slirp_cleanup, 134 }; 135 136 static int net_slirp_init(NetClientState *peer, const char *model, 137 const char *name, int restricted, 138 const char *vnetwork, const char *vhost, 139 const char *vprefix6, int vprefix6_len, 140 const char *vhost6, 141 const char *vhostname, const char *tftp_export, 142 const char *bootfile, const char *vdhcp_start, 143 const char *vnameserver, const char *vnameserver6, 144 const char *smb_export, const char *vsmbserver, 145 const char **dnssearch) 146 { 147 /* default settings according to historic slirp */ 148 struct in_addr net = { .s_addr = htonl(0x0a000200) }; /* 10.0.2.0 */ 149 struct in_addr mask = { .s_addr = htonl(0xffffff00) }; /* 255.255.255.0 */ 150 struct in_addr host = { .s_addr = htonl(0x0a000202) }; /* 10.0.2.2 */ 151 struct in_addr dhcp = { .s_addr = htonl(0x0a00020f) }; /* 10.0.2.15 */ 152 struct in_addr dns = { .s_addr = htonl(0x0a000203) }; /* 10.0.2.3 */ 153 struct in6_addr ip6_prefix; 154 struct in6_addr ip6_host; 155 struct in6_addr ip6_dns; 156 #ifndef _WIN32 157 struct in_addr smbsrv = { .s_addr = 0 }; 158 #endif 159 NetClientState *nc; 160 SlirpState *s; 161 char buf[20]; 162 uint32_t addr; 163 int shift; 164 char *end; 165 struct slirp_config_str *config; 166 167 if (!tftp_export) { 168 tftp_export = legacy_tftp_prefix; 169 } 170 if (!bootfile) { 171 bootfile = legacy_bootp_filename; 172 } 173 174 if (vnetwork) { 175 if (get_str_sep(buf, sizeof(buf), &vnetwork, '/') < 0) { 176 if (!inet_aton(vnetwork, &net)) { 177 return -1; 178 } 179 addr = ntohl(net.s_addr); 180 if (!(addr & 0x80000000)) { 181 mask.s_addr = htonl(0xff000000); /* class A */ 182 } else if ((addr & 0xfff00000) == 0xac100000) { 183 mask.s_addr = htonl(0xfff00000); /* priv. 172.16.0.0/12 */ 184 } else if ((addr & 0xc0000000) == 0x80000000) { 185 mask.s_addr = htonl(0xffff0000); /* class B */ 186 } else if ((addr & 0xffff0000) == 0xc0a80000) { 187 mask.s_addr = htonl(0xffff0000); /* priv. 192.168.0.0/16 */ 188 } else if ((addr & 0xffff0000) == 0xc6120000) { 189 mask.s_addr = htonl(0xfffe0000); /* tests 198.18.0.0/15 */ 190 } else if ((addr & 0xe0000000) == 0xe0000000) { 191 mask.s_addr = htonl(0xffffff00); /* class C */ 192 } else { 193 mask.s_addr = htonl(0xfffffff0); /* multicast/reserved */ 194 } 195 } else { 196 if (!inet_aton(buf, &net)) { 197 return -1; 198 } 199 shift = strtol(vnetwork, &end, 10); 200 if (*end != '\0') { 201 if (!inet_aton(vnetwork, &mask)) { 202 return -1; 203 } 204 } else if (shift < 4 || shift > 32) { 205 return -1; 206 } else { 207 mask.s_addr = htonl(0xffffffff << (32 - shift)); 208 } 209 } 210 net.s_addr &= mask.s_addr; 211 host.s_addr = net.s_addr | (htonl(0x0202) & ~mask.s_addr); 212 dhcp.s_addr = net.s_addr | (htonl(0x020f) & ~mask.s_addr); 213 dns.s_addr = net.s_addr | (htonl(0x0203) & ~mask.s_addr); 214 } 215 216 if (vhost && !inet_aton(vhost, &host)) { 217 return -1; 218 } 219 if ((host.s_addr & mask.s_addr) != net.s_addr) { 220 return -1; 221 } 222 223 if (vnameserver && !inet_aton(vnameserver, &dns)) { 224 return -1; 225 } 226 if ((dns.s_addr & mask.s_addr) != net.s_addr || 227 dns.s_addr == host.s_addr) { 228 return -1; 229 } 230 231 if (vdhcp_start && !inet_aton(vdhcp_start, &dhcp)) { 232 return -1; 233 } 234 if ((dhcp.s_addr & mask.s_addr) != net.s_addr || 235 dhcp.s_addr == host.s_addr || dhcp.s_addr == dns.s_addr) { 236 return -1; 237 } 238 239 #ifndef _WIN32 240 if (vsmbserver && !inet_aton(vsmbserver, &smbsrv)) { 241 return -1; 242 } 243 #endif 244 245 #if defined(_WIN32) && (_WIN32_WINNT < 0x0600) 246 /* No inet_pton helper before Vista... */ 247 if (vprefix6) { 248 /* Unsupported */ 249 return -1; 250 } 251 memset(&ip6_prefix, 0, sizeof(ip6_prefix)); 252 ip6_prefix.s6_addr[0] = 0xfe; 253 ip6_prefix.s6_addr[1] = 0xc0; 254 #else 255 if (!vprefix6) { 256 vprefix6 = "fec0::"; 257 } 258 if (!inet_pton(AF_INET6, vprefix6, &ip6_prefix)) { 259 return -1; 260 } 261 #endif 262 263 if (!vprefix6_len) { 264 vprefix6_len = 64; 265 } 266 if (vprefix6_len < 0 || vprefix6_len > 126) { 267 return -1; 268 } 269 270 if (vhost6) { 271 #if defined(_WIN32) && (_WIN32_WINNT < 0x0600) 272 return -1; 273 #else 274 if (!inet_pton(AF_INET6, vhost6, &ip6_host)) { 275 return -1; 276 } 277 if (!in6_equal_net(&ip6_prefix, &ip6_host, vprefix6_len)) { 278 return -1; 279 } 280 #endif 281 } else { 282 ip6_host = ip6_prefix; 283 ip6_host.s6_addr[15] |= 2; 284 } 285 286 if (vnameserver6) { 287 #if defined(_WIN32) && (_WIN32_WINNT < 0x0600) 288 return -1; 289 #else 290 if (!inet_pton(AF_INET6, vnameserver6, &ip6_dns)) { 291 return -1; 292 } 293 if (!in6_equal_net(&ip6_prefix, &ip6_dns, vprefix6_len)) { 294 return -1; 295 } 296 #endif 297 } else { 298 ip6_dns = ip6_prefix; 299 ip6_dns.s6_addr[15] |= 3; 300 } 301 302 303 nc = qemu_new_net_client(&net_slirp_info, peer, model, name); 304 305 snprintf(nc->info_str, sizeof(nc->info_str), 306 "net=%s,restrict=%s", inet_ntoa(net), 307 restricted ? "on" : "off"); 308 309 s = DO_UPCAST(SlirpState, nc, nc); 310 311 s->slirp = slirp_init(restricted, net, mask, host, 312 ip6_prefix, vprefix6_len, ip6_host, 313 vhostname, tftp_export, bootfile, dhcp, 314 dns, ip6_dns, dnssearch, s); 315 QTAILQ_INSERT_TAIL(&slirp_stacks, s, entry); 316 317 for (config = slirp_configs; config; config = config->next) { 318 if (config->flags & SLIRP_CFG_HOSTFWD) { 319 if (slirp_hostfwd(s, config->str, 320 config->flags & SLIRP_CFG_LEGACY) < 0) 321 goto error; 322 } else { 323 if (slirp_guestfwd(s, config->str, 324 config->flags & SLIRP_CFG_LEGACY) < 0) 325 goto error; 326 } 327 } 328 #ifndef _WIN32 329 if (!smb_export) { 330 smb_export = legacy_smb_export; 331 } 332 if (smb_export) { 333 if (slirp_smb(s, smb_export, smbsrv) < 0) 334 goto error; 335 } 336 #endif 337 338 return 0; 339 340 error: 341 qemu_del_net_client(nc); 342 return -1; 343 } 344 345 static SlirpState *slirp_lookup(Monitor *mon, const char *vlan, 346 const char *stack) 347 { 348 349 if (vlan) { 350 NetClientState *nc; 351 nc = net_hub_find_client_by_name(strtol(vlan, NULL, 0), stack); 352 if (!nc) { 353 monitor_printf(mon, "unrecognized (vlan-id, stackname) pair\n"); 354 return NULL; 355 } 356 if (strcmp(nc->model, "user")) { 357 monitor_printf(mon, "invalid device specified\n"); 358 return NULL; 359 } 360 return DO_UPCAST(SlirpState, nc, nc); 361 } else { 362 if (QTAILQ_EMPTY(&slirp_stacks)) { 363 monitor_printf(mon, "user mode network stack not in use\n"); 364 return NULL; 365 } 366 return QTAILQ_FIRST(&slirp_stacks); 367 } 368 } 369 370 void hmp_hostfwd_remove(Monitor *mon, const QDict *qdict) 371 { 372 struct in_addr host_addr = { .s_addr = INADDR_ANY }; 373 int host_port; 374 char buf[256]; 375 const char *src_str, *p; 376 SlirpState *s; 377 int is_udp = 0; 378 int err; 379 const char *arg1 = qdict_get_str(qdict, "arg1"); 380 const char *arg2 = qdict_get_try_str(qdict, "arg2"); 381 const char *arg3 = qdict_get_try_str(qdict, "arg3"); 382 383 if (arg2) { 384 s = slirp_lookup(mon, arg1, arg2); 385 src_str = arg3; 386 } else { 387 s = slirp_lookup(mon, NULL, NULL); 388 src_str = arg1; 389 } 390 if (!s) { 391 return; 392 } 393 394 p = src_str; 395 if (!p || get_str_sep(buf, sizeof(buf), &p, ':') < 0) { 396 goto fail_syntax; 397 } 398 399 if (!strcmp(buf, "tcp") || buf[0] == '\0') { 400 is_udp = 0; 401 } else if (!strcmp(buf, "udp")) { 402 is_udp = 1; 403 } else { 404 goto fail_syntax; 405 } 406 407 if (get_str_sep(buf, sizeof(buf), &p, ':') < 0) { 408 goto fail_syntax; 409 } 410 if (buf[0] != '\0' && !inet_aton(buf, &host_addr)) { 411 goto fail_syntax; 412 } 413 414 host_port = atoi(p); 415 416 err = slirp_remove_hostfwd(s->slirp, is_udp, host_addr, host_port); 417 418 monitor_printf(mon, "host forwarding rule for %s %s\n", src_str, 419 err ? "not found" : "removed"); 420 return; 421 422 fail_syntax: 423 monitor_printf(mon, "invalid format\n"); 424 } 425 426 static int slirp_hostfwd(SlirpState *s, const char *redir_str, 427 int legacy_format) 428 { 429 struct in_addr host_addr = { .s_addr = INADDR_ANY }; 430 struct in_addr guest_addr = { .s_addr = 0 }; 431 int host_port, guest_port; 432 const char *p; 433 char buf[256]; 434 int is_udp; 435 char *end; 436 437 p = redir_str; 438 if (!p || get_str_sep(buf, sizeof(buf), &p, ':') < 0) { 439 goto fail_syntax; 440 } 441 if (!strcmp(buf, "tcp") || buf[0] == '\0') { 442 is_udp = 0; 443 } else if (!strcmp(buf, "udp")) { 444 is_udp = 1; 445 } else { 446 goto fail_syntax; 447 } 448 449 if (!legacy_format) { 450 if (get_str_sep(buf, sizeof(buf), &p, ':') < 0) { 451 goto fail_syntax; 452 } 453 if (buf[0] != '\0' && !inet_aton(buf, &host_addr)) { 454 goto fail_syntax; 455 } 456 } 457 458 if (get_str_sep(buf, sizeof(buf), &p, legacy_format ? ':' : '-') < 0) { 459 goto fail_syntax; 460 } 461 host_port = strtol(buf, &end, 0); 462 if (*end != '\0' || host_port < 1 || host_port > 65535) { 463 goto fail_syntax; 464 } 465 466 if (get_str_sep(buf, sizeof(buf), &p, ':') < 0) { 467 goto fail_syntax; 468 } 469 if (buf[0] != '\0' && !inet_aton(buf, &guest_addr)) { 470 goto fail_syntax; 471 } 472 473 guest_port = strtol(p, &end, 0); 474 if (*end != '\0' || guest_port < 1 || guest_port > 65535) { 475 goto fail_syntax; 476 } 477 478 if (slirp_add_hostfwd(s->slirp, is_udp, host_addr, host_port, guest_addr, 479 guest_port) < 0) { 480 error_report("could not set up host forwarding rule '%s'", 481 redir_str); 482 return -1; 483 } 484 return 0; 485 486 fail_syntax: 487 error_report("invalid host forwarding rule '%s'", redir_str); 488 return -1; 489 } 490 491 void hmp_hostfwd_add(Monitor *mon, const QDict *qdict) 492 { 493 const char *redir_str; 494 SlirpState *s; 495 const char *arg1 = qdict_get_str(qdict, "arg1"); 496 const char *arg2 = qdict_get_try_str(qdict, "arg2"); 497 const char *arg3 = qdict_get_try_str(qdict, "arg3"); 498 499 if (arg2) { 500 s = slirp_lookup(mon, arg1, arg2); 501 redir_str = arg3; 502 } else { 503 s = slirp_lookup(mon, NULL, NULL); 504 redir_str = arg1; 505 } 506 if (s) { 507 slirp_hostfwd(s, redir_str, 0); 508 } 509 510 } 511 512 int net_slirp_redir(const char *redir_str) 513 { 514 struct slirp_config_str *config; 515 516 if (QTAILQ_EMPTY(&slirp_stacks)) { 517 config = g_malloc(sizeof(*config)); 518 pstrcpy(config->str, sizeof(config->str), redir_str); 519 config->flags = SLIRP_CFG_HOSTFWD | SLIRP_CFG_LEGACY; 520 config->next = slirp_configs; 521 slirp_configs = config; 522 return 0; 523 } 524 525 return slirp_hostfwd(QTAILQ_FIRST(&slirp_stacks), redir_str, 1); 526 } 527 528 #ifndef _WIN32 529 530 /* automatic user mode samba server configuration */ 531 static void slirp_smb_cleanup(SlirpState *s) 532 { 533 char cmd[128]; 534 int ret; 535 536 if (s->smb_dir[0] != '\0') { 537 snprintf(cmd, sizeof(cmd), "rm -rf %s", s->smb_dir); 538 ret = system(cmd); 539 if (ret == -1 || !WIFEXITED(ret)) { 540 error_report("'%s' failed.", cmd); 541 } else if (WEXITSTATUS(ret)) { 542 error_report("'%s' failed. Error code: %d", 543 cmd, WEXITSTATUS(ret)); 544 } 545 s->smb_dir[0] = '\0'; 546 } 547 } 548 549 static int slirp_smb(SlirpState* s, const char *exported_dir, 550 struct in_addr vserver_addr) 551 { 552 char smb_conf[128]; 553 char smb_cmdline[128]; 554 struct passwd *passwd; 555 FILE *f; 556 557 passwd = getpwuid(geteuid()); 558 if (!passwd) { 559 error_report("failed to retrieve user name"); 560 return -1; 561 } 562 563 if (access(CONFIG_SMBD_COMMAND, F_OK)) { 564 error_report("could not find '%s', please install it", 565 CONFIG_SMBD_COMMAND); 566 return -1; 567 } 568 569 if (access(exported_dir, R_OK | X_OK)) { 570 error_report("error accessing shared directory '%s': %s", 571 exported_dir, strerror(errno)); 572 return -1; 573 } 574 575 snprintf(s->smb_dir, sizeof(s->smb_dir), "/tmp/qemu-smb.XXXXXX"); 576 if (!mkdtemp(s->smb_dir)) { 577 error_report("could not create samba server dir '%s'", s->smb_dir); 578 s->smb_dir[0] = 0; 579 return -1; 580 } 581 snprintf(smb_conf, sizeof(smb_conf), "%s/%s", s->smb_dir, "smb.conf"); 582 583 f = fopen(smb_conf, "w"); 584 if (!f) { 585 slirp_smb_cleanup(s); 586 error_report("could not create samba server configuration file '%s'", 587 smb_conf); 588 return -1; 589 } 590 fprintf(f, 591 "[global]\n" 592 "private dir=%s\n" 593 "interfaces=127.0.0.1\n" 594 "bind interfaces only=yes\n" 595 "pid directory=%s\n" 596 "lock directory=%s\n" 597 "state directory=%s\n" 598 "cache directory=%s\n" 599 "ncalrpc dir=%s/ncalrpc\n" 600 "log file=%s/log.smbd\n" 601 "smb passwd file=%s/smbpasswd\n" 602 "security = user\n" 603 "map to guest = Bad User\n" 604 "load printers = no\n" 605 "printing = bsd\n" 606 "disable spoolss = yes\n" 607 "usershare max shares = 0\n" 608 "[qemu]\n" 609 "path=%s\n" 610 "read only=no\n" 611 "guest ok=yes\n" 612 "force user=%s\n", 613 s->smb_dir, 614 s->smb_dir, 615 s->smb_dir, 616 s->smb_dir, 617 s->smb_dir, 618 s->smb_dir, 619 s->smb_dir, 620 s->smb_dir, 621 exported_dir, 622 passwd->pw_name 623 ); 624 fclose(f); 625 626 snprintf(smb_cmdline, sizeof(smb_cmdline), "%s -l %s -s %s", 627 CONFIG_SMBD_COMMAND, s->smb_dir, smb_conf); 628 629 if (slirp_add_exec(s->slirp, 0, smb_cmdline, &vserver_addr, 139) < 0 || 630 slirp_add_exec(s->slirp, 0, smb_cmdline, &vserver_addr, 445) < 0) { 631 slirp_smb_cleanup(s); 632 error_report("conflicting/invalid smbserver address"); 633 return -1; 634 } 635 return 0; 636 } 637 638 /* automatic user mode samba server configuration (legacy interface) */ 639 int net_slirp_smb(const char *exported_dir) 640 { 641 struct in_addr vserver_addr = { .s_addr = 0 }; 642 643 if (legacy_smb_export) { 644 fprintf(stderr, "-smb given twice\n"); 645 return -1; 646 } 647 legacy_smb_export = exported_dir; 648 if (!QTAILQ_EMPTY(&slirp_stacks)) { 649 return slirp_smb(QTAILQ_FIRST(&slirp_stacks), exported_dir, 650 vserver_addr); 651 } 652 return 0; 653 } 654 655 #endif /* !defined(_WIN32) */ 656 657 struct GuestFwd { 658 CharDriverState *hd; 659 struct in_addr server; 660 int port; 661 Slirp *slirp; 662 }; 663 664 static int guestfwd_can_read(void *opaque) 665 { 666 struct GuestFwd *fwd = opaque; 667 return slirp_socket_can_recv(fwd->slirp, fwd->server, fwd->port); 668 } 669 670 static void guestfwd_read(void *opaque, const uint8_t *buf, int size) 671 { 672 struct GuestFwd *fwd = opaque; 673 slirp_socket_recv(fwd->slirp, fwd->server, fwd->port, buf, size); 674 } 675 676 static int slirp_guestfwd(SlirpState *s, const char *config_str, 677 int legacy_format) 678 { 679 struct in_addr server = { .s_addr = 0 }; 680 struct GuestFwd *fwd; 681 const char *p; 682 char buf[128]; 683 char *end; 684 int port; 685 686 p = config_str; 687 if (legacy_format) { 688 if (get_str_sep(buf, sizeof(buf), &p, ':') < 0) { 689 goto fail_syntax; 690 } 691 } else { 692 if (get_str_sep(buf, sizeof(buf), &p, ':') < 0) { 693 goto fail_syntax; 694 } 695 if (strcmp(buf, "tcp") && buf[0] != '\0') { 696 goto fail_syntax; 697 } 698 if (get_str_sep(buf, sizeof(buf), &p, ':') < 0) { 699 goto fail_syntax; 700 } 701 if (buf[0] != '\0' && !inet_aton(buf, &server)) { 702 goto fail_syntax; 703 } 704 if (get_str_sep(buf, sizeof(buf), &p, '-') < 0) { 705 goto fail_syntax; 706 } 707 } 708 port = strtol(buf, &end, 10); 709 if (*end != '\0' || port < 1 || port > 65535) { 710 goto fail_syntax; 711 } 712 713 snprintf(buf, sizeof(buf), "guestfwd.tcp.%d", port); 714 715 if ((strlen(p) > 4) && !strncmp(p, "cmd:", 4)) { 716 if (slirp_add_exec(s->slirp, 0, &p[4], &server, port) < 0) { 717 error_report("conflicting/invalid host:port in guest forwarding " 718 "rule '%s'", config_str); 719 return -1; 720 } 721 } else { 722 fwd = g_new(struct GuestFwd, 1); 723 fwd->hd = qemu_chr_new(buf, p, NULL); 724 if (!fwd->hd) { 725 error_report("could not open guest forwarding device '%s'", buf); 726 g_free(fwd); 727 return -1; 728 } 729 730 if (slirp_add_exec(s->slirp, 3, fwd->hd, &server, port) < 0) { 731 error_report("conflicting/invalid host:port in guest forwarding " 732 "rule '%s'", config_str); 733 g_free(fwd); 734 return -1; 735 } 736 fwd->server = server; 737 fwd->port = port; 738 fwd->slirp = s->slirp; 739 740 qemu_chr_fe_claim_no_fail(fwd->hd); 741 qemu_chr_add_handlers(fwd->hd, guestfwd_can_read, guestfwd_read, 742 NULL, fwd); 743 } 744 return 0; 745 746 fail_syntax: 747 error_report("invalid guest forwarding rule '%s'", config_str); 748 return -1; 749 } 750 751 void hmp_info_usernet(Monitor *mon, const QDict *qdict) 752 { 753 SlirpState *s; 754 755 QTAILQ_FOREACH(s, &slirp_stacks, entry) { 756 int id; 757 bool got_vlan_id = net_hub_id_for_client(&s->nc, &id) == 0; 758 monitor_printf(mon, "VLAN %d (%s):\n", 759 got_vlan_id ? id : -1, 760 s->nc.name); 761 slirp_connection_info(s->slirp, mon); 762 } 763 } 764 765 static void 766 net_init_slirp_configs(const StringList *fwd, int flags) 767 { 768 while (fwd) { 769 struct slirp_config_str *config; 770 771 config = g_malloc0(sizeof(*config)); 772 pstrcpy(config->str, sizeof(config->str), fwd->value->str); 773 config->flags = flags; 774 config->next = slirp_configs; 775 slirp_configs = config; 776 777 fwd = fwd->next; 778 } 779 } 780 781 static const char **slirp_dnssearch(const StringList *dnsname) 782 { 783 const StringList *c = dnsname; 784 size_t i = 0, num_opts = 0; 785 const char **ret; 786 787 while (c) { 788 num_opts++; 789 c = c->next; 790 } 791 792 if (num_opts == 0) { 793 return NULL; 794 } 795 796 ret = g_malloc((num_opts + 1) * sizeof(*ret)); 797 c = dnsname; 798 while (c) { 799 ret[i++] = c->value->str; 800 c = c->next; 801 } 802 ret[i] = NULL; 803 return ret; 804 } 805 806 int net_init_slirp(const NetClientOptions *opts, const char *name, 807 NetClientState *peer, Error **errp) 808 { 809 /* FIXME error_setg(errp, ...) on failure */ 810 struct slirp_config_str *config; 811 char *vnet; 812 int ret; 813 const NetdevUserOptions *user; 814 const char **dnssearch; 815 816 assert(opts->type == NET_CLIENT_OPTIONS_KIND_USER); 817 user = opts->u.user; 818 819 vnet = user->has_net ? g_strdup(user->net) : 820 user->has_ip ? g_strdup_printf("%s/24", user->ip) : 821 NULL; 822 823 dnssearch = slirp_dnssearch(user->dnssearch); 824 825 /* all optional fields are initialized to "all bits zero" */ 826 827 net_init_slirp_configs(user->hostfwd, SLIRP_CFG_HOSTFWD); 828 net_init_slirp_configs(user->guestfwd, 0); 829 830 ret = net_slirp_init(peer, "user", name, user->q_restrict, vnet, 831 user->host, user->ip6_prefix, user->ip6_prefixlen, 832 user->ip6_host, user->hostname, user->tftp, 833 user->bootfile, user->dhcpstart, 834 user->dns, user->ip6_dns, user->smb, 835 user->smbserver, dnssearch); 836 837 while (slirp_configs) { 838 config = slirp_configs; 839 slirp_configs = config->next; 840 g_free(config); 841 } 842 843 g_free(vnet); 844 g_free(dnssearch); 845 846 return ret; 847 } 848 849 int net_slirp_parse_legacy(QemuOptsList *opts_list, const char *optarg, int *ret) 850 { 851 if (strcmp(opts_list->name, "net") != 0 || 852 strncmp(optarg, "channel,", strlen("channel,")) != 0) { 853 return 0; 854 } 855 856 error_report("The '-net channel' option is deprecated. " 857 "Please use '-netdev user,guestfwd=...' instead."); 858 859 /* handle legacy -net channel,port:chr */ 860 optarg += strlen("channel,"); 861 862 if (QTAILQ_EMPTY(&slirp_stacks)) { 863 struct slirp_config_str *config; 864 865 config = g_malloc(sizeof(*config)); 866 pstrcpy(config->str, sizeof(config->str), optarg); 867 config->flags = SLIRP_CFG_LEGACY; 868 config->next = slirp_configs; 869 slirp_configs = config; 870 *ret = 0; 871 } else { 872 *ret = slirp_guestfwd(QTAILQ_FIRST(&slirp_stacks), optarg, 1); 873 } 874 875 return 1; 876 } 877 878