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 "qemu/cutils.h" 42 43 static int get_str_sep(char *buf, int buf_size, const char **pp, int sep) 44 { 45 const char *p, *p1; 46 int len; 47 p = *pp; 48 p1 = strchr(p, sep); 49 if (!p1) 50 return -1; 51 len = p1 - p; 52 p1++; 53 if (buf_size > 0) { 54 if (len > buf_size - 1) 55 len = buf_size - 1; 56 memcpy(buf, p, len); 57 buf[len] = '\0'; 58 } 59 *pp = p1; 60 return 0; 61 } 62 63 /* slirp network adapter */ 64 65 #define SLIRP_CFG_HOSTFWD 1 66 #define SLIRP_CFG_LEGACY 2 67 68 struct slirp_config_str { 69 struct slirp_config_str *next; 70 int flags; 71 char str[1024]; 72 int legacy_format; 73 }; 74 75 typedef struct SlirpState { 76 NetClientState nc; 77 QTAILQ_ENTRY(SlirpState) entry; 78 Slirp *slirp; 79 #ifndef _WIN32 80 char smb_dir[128]; 81 #endif 82 } SlirpState; 83 84 static struct slirp_config_str *slirp_configs; 85 const char *legacy_tftp_prefix; 86 const char *legacy_bootp_filename; 87 static QTAILQ_HEAD(slirp_stacks, SlirpState) slirp_stacks = 88 QTAILQ_HEAD_INITIALIZER(slirp_stacks); 89 90 static int slirp_hostfwd(SlirpState *s, const char *redir_str, 91 int legacy_format); 92 static int slirp_guestfwd(SlirpState *s, const char *config_str, 93 int legacy_format); 94 95 #ifndef _WIN32 96 static const char *legacy_smb_export; 97 98 static int slirp_smb(SlirpState *s, const char *exported_dir, 99 struct in_addr vserver_addr); 100 static void slirp_smb_cleanup(SlirpState *s); 101 #else 102 static inline void slirp_smb_cleanup(SlirpState *s) { } 103 #endif 104 105 void slirp_output(void *opaque, const uint8_t *pkt, int pkt_len) 106 { 107 SlirpState *s = opaque; 108 109 qemu_send_packet(&s->nc, pkt, pkt_len); 110 } 111 112 static ssize_t net_slirp_receive(NetClientState *nc, const uint8_t *buf, size_t size) 113 { 114 SlirpState *s = DO_UPCAST(SlirpState, nc, nc); 115 116 slirp_input(s->slirp, buf, size); 117 118 return size; 119 } 120 121 static void net_slirp_cleanup(NetClientState *nc) 122 { 123 SlirpState *s = DO_UPCAST(SlirpState, nc, nc); 124 125 slirp_cleanup(s->slirp); 126 slirp_smb_cleanup(s); 127 QTAILQ_REMOVE(&slirp_stacks, s, entry); 128 } 129 130 static NetClientInfo net_slirp_info = { 131 .type = NET_CLIENT_OPTIONS_KIND_USER, 132 .size = sizeof(SlirpState), 133 .receive = net_slirp_receive, 134 .cleanup = net_slirp_cleanup, 135 }; 136 137 static int net_slirp_init(NetClientState *peer, const char *model, 138 const char *name, int restricted, 139 const char *vnetwork, const char *vhost, 140 const char *vprefix6, int vprefix6_len, 141 const char *vhost6, 142 const char *vhostname, const char *tftp_export, 143 const char *bootfile, const char *vdhcp_start, 144 const char *vnameserver, const char *vnameserver6, 145 const char *smb_export, const char *vsmbserver, 146 const char **dnssearch) 147 { 148 /* default settings according to historic slirp */ 149 struct in_addr net = { .s_addr = htonl(0x0a000200) }; /* 10.0.2.0 */ 150 struct in_addr mask = { .s_addr = htonl(0xffffff00) }; /* 255.255.255.0 */ 151 struct in_addr host = { .s_addr = htonl(0x0a000202) }; /* 10.0.2.2 */ 152 struct in_addr dhcp = { .s_addr = htonl(0x0a00020f) }; /* 10.0.2.15 */ 153 struct in_addr dns = { .s_addr = htonl(0x0a000203) }; /* 10.0.2.3 */ 154 struct in6_addr ip6_prefix; 155 struct in6_addr ip6_host; 156 struct in6_addr ip6_dns; 157 #ifndef _WIN32 158 struct in_addr smbsrv = { .s_addr = 0 }; 159 #endif 160 NetClientState *nc; 161 SlirpState *s; 162 char buf[20]; 163 uint32_t addr; 164 int shift; 165 char *end; 166 struct slirp_config_str *config; 167 168 if (!tftp_export) { 169 tftp_export = legacy_tftp_prefix; 170 } 171 if (!bootfile) { 172 bootfile = legacy_bootp_filename; 173 } 174 175 if (vnetwork) { 176 if (get_str_sep(buf, sizeof(buf), &vnetwork, '/') < 0) { 177 if (!inet_aton(vnetwork, &net)) { 178 return -1; 179 } 180 addr = ntohl(net.s_addr); 181 if (!(addr & 0x80000000)) { 182 mask.s_addr = htonl(0xff000000); /* class A */ 183 } else if ((addr & 0xfff00000) == 0xac100000) { 184 mask.s_addr = htonl(0xfff00000); /* priv. 172.16.0.0/12 */ 185 } else if ((addr & 0xc0000000) == 0x80000000) { 186 mask.s_addr = htonl(0xffff0000); /* class B */ 187 } else if ((addr & 0xffff0000) == 0xc0a80000) { 188 mask.s_addr = htonl(0xffff0000); /* priv. 192.168.0.0/16 */ 189 } else if ((addr & 0xffff0000) == 0xc6120000) { 190 mask.s_addr = htonl(0xfffe0000); /* tests 198.18.0.0/15 */ 191 } else if ((addr & 0xe0000000) == 0xe0000000) { 192 mask.s_addr = htonl(0xffffff00); /* class C */ 193 } else { 194 mask.s_addr = htonl(0xfffffff0); /* multicast/reserved */ 195 } 196 } else { 197 if (!inet_aton(buf, &net)) { 198 return -1; 199 } 200 shift = strtol(vnetwork, &end, 10); 201 if (*end != '\0') { 202 if (!inet_aton(vnetwork, &mask)) { 203 return -1; 204 } 205 } else if (shift < 4 || shift > 32) { 206 return -1; 207 } else { 208 mask.s_addr = htonl(0xffffffff << (32 - shift)); 209 } 210 } 211 net.s_addr &= mask.s_addr; 212 host.s_addr = net.s_addr | (htonl(0x0202) & ~mask.s_addr); 213 dhcp.s_addr = net.s_addr | (htonl(0x020f) & ~mask.s_addr); 214 dns.s_addr = net.s_addr | (htonl(0x0203) & ~mask.s_addr); 215 } 216 217 if (vhost && !inet_aton(vhost, &host)) { 218 return -1; 219 } 220 if ((host.s_addr & mask.s_addr) != net.s_addr) { 221 return -1; 222 } 223 224 if (vnameserver && !inet_aton(vnameserver, &dns)) { 225 return -1; 226 } 227 if ((dns.s_addr & mask.s_addr) != net.s_addr || 228 dns.s_addr == host.s_addr) { 229 return -1; 230 } 231 232 if (vdhcp_start && !inet_aton(vdhcp_start, &dhcp)) { 233 return -1; 234 } 235 if ((dhcp.s_addr & mask.s_addr) != net.s_addr || 236 dhcp.s_addr == host.s_addr || dhcp.s_addr == dns.s_addr) { 237 return -1; 238 } 239 240 #ifndef _WIN32 241 if (vsmbserver && !inet_aton(vsmbserver, &smbsrv)) { 242 return -1; 243 } 244 #endif 245 246 #if defined(_WIN32) && (_WIN32_WINNT < 0x0600) 247 /* No inet_pton helper before Vista... */ 248 if (vprefix6) { 249 /* Unsupported */ 250 return -1; 251 } 252 memset(&ip6_prefix, 0, sizeof(ip6_prefix)); 253 ip6_prefix.s6_addr[0] = 0xfe; 254 ip6_prefix.s6_addr[1] = 0xc0; 255 #else 256 if (!vprefix6) { 257 vprefix6 = "fec0::"; 258 } 259 if (!inet_pton(AF_INET6, vprefix6, &ip6_prefix)) { 260 return -1; 261 } 262 #endif 263 264 if (!vprefix6_len) { 265 vprefix6_len = 64; 266 } 267 if (vprefix6_len < 0 || vprefix6_len > 126) { 268 return -1; 269 } 270 271 if (vhost6) { 272 #if defined(_WIN32) && (_WIN32_WINNT < 0x0600) 273 return -1; 274 #else 275 if (!inet_pton(AF_INET6, vhost6, &ip6_host)) { 276 return -1; 277 } 278 if (!in6_equal_net(&ip6_prefix, &ip6_host, vprefix6_len)) { 279 return -1; 280 } 281 #endif 282 } else { 283 ip6_host = ip6_prefix; 284 ip6_host.s6_addr[15] |= 2; 285 } 286 287 if (vnameserver6) { 288 #if defined(_WIN32) && (_WIN32_WINNT < 0x0600) 289 return -1; 290 #else 291 if (!inet_pton(AF_INET6, vnameserver6, &ip6_dns)) { 292 return -1; 293 } 294 if (!in6_equal_net(&ip6_prefix, &ip6_dns, vprefix6_len)) { 295 return -1; 296 } 297 #endif 298 } else { 299 ip6_dns = ip6_prefix; 300 ip6_dns.s6_addr[15] |= 3; 301 } 302 303 304 nc = qemu_new_net_client(&net_slirp_info, peer, model, name); 305 306 snprintf(nc->info_str, sizeof(nc->info_str), 307 "net=%s,restrict=%s", inet_ntoa(net), 308 restricted ? "on" : "off"); 309 310 s = DO_UPCAST(SlirpState, nc, nc); 311 312 s->slirp = slirp_init(restricted, net, mask, host, 313 ip6_prefix, vprefix6_len, ip6_host, 314 vhostname, tftp_export, bootfile, dhcp, 315 dns, ip6_dns, dnssearch, s); 316 QTAILQ_INSERT_TAIL(&slirp_stacks, s, entry); 317 318 for (config = slirp_configs; config; config = config->next) { 319 if (config->flags & SLIRP_CFG_HOSTFWD) { 320 if (slirp_hostfwd(s, config->str, 321 config->flags & SLIRP_CFG_LEGACY) < 0) 322 goto error; 323 } else { 324 if (slirp_guestfwd(s, config->str, 325 config->flags & SLIRP_CFG_LEGACY) < 0) 326 goto error; 327 } 328 } 329 #ifndef _WIN32 330 if (!smb_export) { 331 smb_export = legacy_smb_export; 332 } 333 if (smb_export) { 334 if (slirp_smb(s, smb_export, smbsrv) < 0) 335 goto error; 336 } 337 #endif 338 339 return 0; 340 341 error: 342 qemu_del_net_client(nc); 343 return -1; 344 } 345 346 static SlirpState *slirp_lookup(Monitor *mon, const char *vlan, 347 const char *stack) 348 { 349 350 if (vlan) { 351 NetClientState *nc; 352 nc = net_hub_find_client_by_name(strtol(vlan, NULL, 0), stack); 353 if (!nc) { 354 monitor_printf(mon, "unrecognized (vlan-id, stackname) pair\n"); 355 return NULL; 356 } 357 if (strcmp(nc->model, "user")) { 358 monitor_printf(mon, "invalid device specified\n"); 359 return NULL; 360 } 361 return DO_UPCAST(SlirpState, nc, nc); 362 } else { 363 if (QTAILQ_EMPTY(&slirp_stacks)) { 364 monitor_printf(mon, "user mode network stack not in use\n"); 365 return NULL; 366 } 367 return QTAILQ_FIRST(&slirp_stacks); 368 } 369 } 370 371 void hmp_hostfwd_remove(Monitor *mon, const QDict *qdict) 372 { 373 struct in_addr host_addr = { .s_addr = INADDR_ANY }; 374 int host_port; 375 char buf[256]; 376 const char *src_str, *p; 377 SlirpState *s; 378 int is_udp = 0; 379 int err; 380 const char *arg1 = qdict_get_str(qdict, "arg1"); 381 const char *arg2 = qdict_get_try_str(qdict, "arg2"); 382 const char *arg3 = qdict_get_try_str(qdict, "arg3"); 383 384 if (arg2) { 385 s = slirp_lookup(mon, arg1, arg2); 386 src_str = arg3; 387 } else { 388 s = slirp_lookup(mon, NULL, NULL); 389 src_str = arg1; 390 } 391 if (!s) { 392 return; 393 } 394 395 p = src_str; 396 if (!p || get_str_sep(buf, sizeof(buf), &p, ':') < 0) { 397 goto fail_syntax; 398 } 399 400 if (!strcmp(buf, "tcp") || buf[0] == '\0') { 401 is_udp = 0; 402 } else if (!strcmp(buf, "udp")) { 403 is_udp = 1; 404 } else { 405 goto fail_syntax; 406 } 407 408 if (get_str_sep(buf, sizeof(buf), &p, ':') < 0) { 409 goto fail_syntax; 410 } 411 if (buf[0] != '\0' && !inet_aton(buf, &host_addr)) { 412 goto fail_syntax; 413 } 414 415 host_port = atoi(p); 416 417 err = slirp_remove_hostfwd(s->slirp, is_udp, host_addr, host_port); 418 419 monitor_printf(mon, "host forwarding rule for %s %s\n", src_str, 420 err ? "not found" : "removed"); 421 return; 422 423 fail_syntax: 424 monitor_printf(mon, "invalid format\n"); 425 } 426 427 static int slirp_hostfwd(SlirpState *s, const char *redir_str, 428 int legacy_format) 429 { 430 struct in_addr host_addr = { .s_addr = INADDR_ANY }; 431 struct in_addr guest_addr = { .s_addr = 0 }; 432 int host_port, guest_port; 433 const char *p; 434 char buf[256]; 435 int is_udp; 436 char *end; 437 438 p = redir_str; 439 if (!p || get_str_sep(buf, sizeof(buf), &p, ':') < 0) { 440 goto fail_syntax; 441 } 442 if (!strcmp(buf, "tcp") || buf[0] == '\0') { 443 is_udp = 0; 444 } else if (!strcmp(buf, "udp")) { 445 is_udp = 1; 446 } else { 447 goto fail_syntax; 448 } 449 450 if (!legacy_format) { 451 if (get_str_sep(buf, sizeof(buf), &p, ':') < 0) { 452 goto fail_syntax; 453 } 454 if (buf[0] != '\0' && !inet_aton(buf, &host_addr)) { 455 goto fail_syntax; 456 } 457 } 458 459 if (get_str_sep(buf, sizeof(buf), &p, legacy_format ? ':' : '-') < 0) { 460 goto fail_syntax; 461 } 462 host_port = strtol(buf, &end, 0); 463 if (*end != '\0' || host_port < 1 || host_port > 65535) { 464 goto fail_syntax; 465 } 466 467 if (get_str_sep(buf, sizeof(buf), &p, ':') < 0) { 468 goto fail_syntax; 469 } 470 if (buf[0] != '\0' && !inet_aton(buf, &guest_addr)) { 471 goto fail_syntax; 472 } 473 474 guest_port = strtol(p, &end, 0); 475 if (*end != '\0' || guest_port < 1 || guest_port > 65535) { 476 goto fail_syntax; 477 } 478 479 if (slirp_add_hostfwd(s->slirp, is_udp, host_addr, host_port, guest_addr, 480 guest_port) < 0) { 481 error_report("could not set up host forwarding rule '%s'", 482 redir_str); 483 return -1; 484 } 485 return 0; 486 487 fail_syntax: 488 error_report("invalid host forwarding rule '%s'", redir_str); 489 return -1; 490 } 491 492 void hmp_hostfwd_add(Monitor *mon, const QDict *qdict) 493 { 494 const char *redir_str; 495 SlirpState *s; 496 const char *arg1 = qdict_get_str(qdict, "arg1"); 497 const char *arg2 = qdict_get_try_str(qdict, "arg2"); 498 const char *arg3 = qdict_get_try_str(qdict, "arg3"); 499 500 if (arg2) { 501 s = slirp_lookup(mon, arg1, arg2); 502 redir_str = arg3; 503 } else { 504 s = slirp_lookup(mon, NULL, NULL); 505 redir_str = arg1; 506 } 507 if (s) { 508 slirp_hostfwd(s, redir_str, 0); 509 } 510 511 } 512 513 int net_slirp_redir(const char *redir_str) 514 { 515 struct slirp_config_str *config; 516 517 if (QTAILQ_EMPTY(&slirp_stacks)) { 518 config = g_malloc(sizeof(*config)); 519 pstrcpy(config->str, sizeof(config->str), redir_str); 520 config->flags = SLIRP_CFG_HOSTFWD | SLIRP_CFG_LEGACY; 521 config->next = slirp_configs; 522 slirp_configs = config; 523 return 0; 524 } 525 526 return slirp_hostfwd(QTAILQ_FIRST(&slirp_stacks), redir_str, 1); 527 } 528 529 #ifndef _WIN32 530 531 /* automatic user mode samba server configuration */ 532 static void slirp_smb_cleanup(SlirpState *s) 533 { 534 char cmd[128]; 535 int ret; 536 537 if (s->smb_dir[0] != '\0') { 538 snprintf(cmd, sizeof(cmd), "rm -rf %s", s->smb_dir); 539 ret = system(cmd); 540 if (ret == -1 || !WIFEXITED(ret)) { 541 error_report("'%s' failed.", cmd); 542 } else if (WEXITSTATUS(ret)) { 543 error_report("'%s' failed. Error code: %d", 544 cmd, WEXITSTATUS(ret)); 545 } 546 s->smb_dir[0] = '\0'; 547 } 548 } 549 550 static int slirp_smb(SlirpState* s, const char *exported_dir, 551 struct in_addr vserver_addr) 552 { 553 char smb_conf[128]; 554 char smb_cmdline[128]; 555 struct passwd *passwd; 556 FILE *f; 557 558 passwd = getpwuid(geteuid()); 559 if (!passwd) { 560 error_report("failed to retrieve user name"); 561 return -1; 562 } 563 564 if (access(CONFIG_SMBD_COMMAND, F_OK)) { 565 error_report("could not find '%s', please install it", 566 CONFIG_SMBD_COMMAND); 567 return -1; 568 } 569 570 if (access(exported_dir, R_OK | X_OK)) { 571 error_report("error accessing shared directory '%s': %s", 572 exported_dir, strerror(errno)); 573 return -1; 574 } 575 576 snprintf(s->smb_dir, sizeof(s->smb_dir), "/tmp/qemu-smb.XXXXXX"); 577 if (!mkdtemp(s->smb_dir)) { 578 error_report("could not create samba server dir '%s'", s->smb_dir); 579 s->smb_dir[0] = 0; 580 return -1; 581 } 582 snprintf(smb_conf, sizeof(smb_conf), "%s/%s", s->smb_dir, "smb.conf"); 583 584 f = fopen(smb_conf, "w"); 585 if (!f) { 586 slirp_smb_cleanup(s); 587 error_report("could not create samba server configuration file '%s'", 588 smb_conf); 589 return -1; 590 } 591 fprintf(f, 592 "[global]\n" 593 "private dir=%s\n" 594 "interfaces=127.0.0.1\n" 595 "bind interfaces only=yes\n" 596 "pid directory=%s\n" 597 "lock directory=%s\n" 598 "state directory=%s\n" 599 "cache directory=%s\n" 600 "ncalrpc dir=%s/ncalrpc\n" 601 "log file=%s/log.smbd\n" 602 "smb passwd file=%s/smbpasswd\n" 603 "security = user\n" 604 "map to guest = Bad User\n" 605 "load printers = no\n" 606 "printing = bsd\n" 607 "disable spoolss = yes\n" 608 "usershare max shares = 0\n" 609 "[qemu]\n" 610 "path=%s\n" 611 "read only=no\n" 612 "guest ok=yes\n" 613 "force user=%s\n", 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 s->smb_dir, 622 exported_dir, 623 passwd->pw_name 624 ); 625 fclose(f); 626 627 snprintf(smb_cmdline, sizeof(smb_cmdline), "%s -l %s -s %s", 628 CONFIG_SMBD_COMMAND, s->smb_dir, smb_conf); 629 630 if (slirp_add_exec(s->slirp, 0, smb_cmdline, &vserver_addr, 139) < 0 || 631 slirp_add_exec(s->slirp, 0, smb_cmdline, &vserver_addr, 445) < 0) { 632 slirp_smb_cleanup(s); 633 error_report("conflicting/invalid smbserver address"); 634 return -1; 635 } 636 return 0; 637 } 638 639 /* automatic user mode samba server configuration (legacy interface) */ 640 int net_slirp_smb(const char *exported_dir) 641 { 642 struct in_addr vserver_addr = { .s_addr = 0 }; 643 644 if (legacy_smb_export) { 645 fprintf(stderr, "-smb given twice\n"); 646 return -1; 647 } 648 legacy_smb_export = exported_dir; 649 if (!QTAILQ_EMPTY(&slirp_stacks)) { 650 return slirp_smb(QTAILQ_FIRST(&slirp_stacks), exported_dir, 651 vserver_addr); 652 } 653 return 0; 654 } 655 656 #endif /* !defined(_WIN32) */ 657 658 struct GuestFwd { 659 CharDriverState *hd; 660 struct in_addr server; 661 int port; 662 Slirp *slirp; 663 }; 664 665 static int guestfwd_can_read(void *opaque) 666 { 667 struct GuestFwd *fwd = opaque; 668 return slirp_socket_can_recv(fwd->slirp, fwd->server, fwd->port); 669 } 670 671 static void guestfwd_read(void *opaque, const uint8_t *buf, int size) 672 { 673 struct GuestFwd *fwd = opaque; 674 slirp_socket_recv(fwd->slirp, fwd->server, fwd->port, buf, size); 675 } 676 677 static int slirp_guestfwd(SlirpState *s, const char *config_str, 678 int legacy_format) 679 { 680 struct in_addr server = { .s_addr = 0 }; 681 struct GuestFwd *fwd; 682 const char *p; 683 char buf[128]; 684 char *end; 685 int port; 686 687 p = config_str; 688 if (legacy_format) { 689 if (get_str_sep(buf, sizeof(buf), &p, ':') < 0) { 690 goto fail_syntax; 691 } 692 } else { 693 if (get_str_sep(buf, sizeof(buf), &p, ':') < 0) { 694 goto fail_syntax; 695 } 696 if (strcmp(buf, "tcp") && buf[0] != '\0') { 697 goto fail_syntax; 698 } 699 if (get_str_sep(buf, sizeof(buf), &p, ':') < 0) { 700 goto fail_syntax; 701 } 702 if (buf[0] != '\0' && !inet_aton(buf, &server)) { 703 goto fail_syntax; 704 } 705 if (get_str_sep(buf, sizeof(buf), &p, '-') < 0) { 706 goto fail_syntax; 707 } 708 } 709 port = strtol(buf, &end, 10); 710 if (*end != '\0' || port < 1 || port > 65535) { 711 goto fail_syntax; 712 } 713 714 snprintf(buf, sizeof(buf), "guestfwd.tcp.%d", port); 715 716 if ((strlen(p) > 4) && !strncmp(p, "cmd:", 4)) { 717 if (slirp_add_exec(s->slirp, 0, &p[4], &server, port) < 0) { 718 error_report("conflicting/invalid host:port in guest forwarding " 719 "rule '%s'", config_str); 720 return -1; 721 } 722 } else { 723 fwd = g_new(struct GuestFwd, 1); 724 fwd->hd = qemu_chr_new(buf, p, NULL); 725 if (!fwd->hd) { 726 error_report("could not open guest forwarding device '%s'", buf); 727 g_free(fwd); 728 return -1; 729 } 730 731 if (slirp_add_exec(s->slirp, 3, fwd->hd, &server, port) < 0) { 732 error_report("conflicting/invalid host:port in guest forwarding " 733 "rule '%s'", config_str); 734 g_free(fwd); 735 return -1; 736 } 737 fwd->server = server; 738 fwd->port = port; 739 fwd->slirp = s->slirp; 740 741 qemu_chr_fe_claim_no_fail(fwd->hd); 742 qemu_chr_add_handlers(fwd->hd, guestfwd_can_read, guestfwd_read, 743 NULL, fwd); 744 } 745 return 0; 746 747 fail_syntax: 748 error_report("invalid guest forwarding rule '%s'", config_str); 749 return -1; 750 } 751 752 void hmp_info_usernet(Monitor *mon, const QDict *qdict) 753 { 754 SlirpState *s; 755 756 QTAILQ_FOREACH(s, &slirp_stacks, entry) { 757 int id; 758 bool got_vlan_id = net_hub_id_for_client(&s->nc, &id) == 0; 759 monitor_printf(mon, "VLAN %d (%s):\n", 760 got_vlan_id ? id : -1, 761 s->nc.name); 762 slirp_connection_info(s->slirp, mon); 763 } 764 } 765 766 static void 767 net_init_slirp_configs(const StringList *fwd, int flags) 768 { 769 while (fwd) { 770 struct slirp_config_str *config; 771 772 config = g_malloc0(sizeof(*config)); 773 pstrcpy(config->str, sizeof(config->str), fwd->value->str); 774 config->flags = flags; 775 config->next = slirp_configs; 776 slirp_configs = config; 777 778 fwd = fwd->next; 779 } 780 } 781 782 static const char **slirp_dnssearch(const StringList *dnsname) 783 { 784 const StringList *c = dnsname; 785 size_t i = 0, num_opts = 0; 786 const char **ret; 787 788 while (c) { 789 num_opts++; 790 c = c->next; 791 } 792 793 if (num_opts == 0) { 794 return NULL; 795 } 796 797 ret = g_malloc((num_opts + 1) * sizeof(*ret)); 798 c = dnsname; 799 while (c) { 800 ret[i++] = c->value->str; 801 c = c->next; 802 } 803 ret[i] = NULL; 804 return ret; 805 } 806 807 int net_init_slirp(const NetClientOptions *opts, const char *name, 808 NetClientState *peer, Error **errp) 809 { 810 /* FIXME error_setg(errp, ...) on failure */ 811 struct slirp_config_str *config; 812 char *vnet; 813 int ret; 814 const NetdevUserOptions *user; 815 const char **dnssearch; 816 817 assert(opts->type == NET_CLIENT_OPTIONS_KIND_USER); 818 user = opts->u.user.data; 819 820 vnet = user->has_net ? g_strdup(user->net) : 821 user->has_ip ? g_strdup_printf("%s/24", user->ip) : 822 NULL; 823 824 dnssearch = slirp_dnssearch(user->dnssearch); 825 826 /* all optional fields are initialized to "all bits zero" */ 827 828 net_init_slirp_configs(user->hostfwd, SLIRP_CFG_HOSTFWD); 829 net_init_slirp_configs(user->guestfwd, 0); 830 831 ret = net_slirp_init(peer, "user", name, user->q_restrict, vnet, 832 user->host, user->ip6_prefix, user->ip6_prefixlen, 833 user->ip6_host, user->hostname, user->tftp, 834 user->bootfile, user->dhcpstart, 835 user->dns, user->ip6_dns, user->smb, 836 user->smbserver, dnssearch); 837 838 while (slirp_configs) { 839 config = slirp_configs; 840 slirp_configs = config->next; 841 g_free(config); 842 } 843 844 g_free(vnet); 845 g_free(dnssearch); 846 847 return ret; 848 } 849 850 int net_slirp_parse_legacy(QemuOptsList *opts_list, const char *optarg, int *ret) 851 { 852 if (strcmp(opts_list->name, "net") != 0 || 853 strncmp(optarg, "channel,", strlen("channel,")) != 0) { 854 return 0; 855 } 856 857 error_report("The '-net channel' option is deprecated. " 858 "Please use '-netdev user,guestfwd=...' instead."); 859 860 /* handle legacy -net channel,port:chr */ 861 optarg += strlen("channel,"); 862 863 if (QTAILQ_EMPTY(&slirp_stacks)) { 864 struct slirp_config_str *config; 865 866 config = g_malloc(sizeof(*config)); 867 pstrcpy(config->str, sizeof(config->str), optarg); 868 config->flags = SLIRP_CFG_LEGACY; 869 config->next = slirp_configs; 870 slirp_configs = config; 871 *ret = 0; 872 } else { 873 *ret = slirp_guestfwd(QTAILQ_FIRST(&slirp_stacks), optarg, 1); 874 } 875 876 return 1; 877 } 878 879