net/slirp.c

   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
  25 #include "qemu/osdep.h"
  26 #include "net/slirp.h"
  27
  28
  29 #ifndef _WIN32
  30 #include <pwd.h>
  31 #include <sys/wait.h>
  32 #endif
  33 #include "net/net.h"
  34 #include "clients.h"
  35 #include "hub.h"
  36 #include "monitor/monitor.h"
  37 #include "qemu/error-report.h"
  38 #include "qemu/sockets.h"
  39 #include "slirp/libslirp.h"
  40 #include "slirp/ip6.h"
  41 #include "chardev/char-fe.h"
  42 #include "sysemu/sysemu.h"
  43 #include "qemu/cutils.h"
  44 #include "qapi/error.h"
  45 #include "qapi/qmp/qdict.h"
  46
  47 static int get_str_sep(char *buf, int buf_size, const char **pp, int sep)
  48 {
  49     const char *p, *p1;
  50     int len;
  51     p = *pp;
  52     p1 = strchr(p, sep);
  53     if (!p1)
  54         return -1;
  55     len = p1 - p;
  56     p1++;
  57     if (buf_size > 0) {
  58         if (len > buf_size - 1)
  59             len = buf_size - 1;
  60         memcpy(buf, p, len);
  61         buf[len] = '\0';
  62     }
  63     *pp = p1;
  64     return 0;
  65 }
  66
  67 /* slirp network adapter */
  68
  69 #define SLIRP_CFG_HOSTFWD 1
  70 #define SLIRP_CFG_LEGACY  2
  71
  72 struct slirp_config_str {
  73     struct slirp_config_str *next;
  74     int flags;
  75     char str[1024];
  76     int legacy_format;
  77 };
  78
  79 typedef struct SlirpState {
  80     NetClientState nc;
  81     QTAILQ_ENTRY(SlirpState) entry;
  82     Slirp *slirp;
  83     Notifier exit_notifier;
  84 #ifndef _WIN32
  85     gchar *smb_dir;
  86 #endif
  87 } SlirpState;
  88
  89 static struct slirp_config_str *slirp_configs;
  90 const char *legacy_tftp_prefix;
  91 const char *legacy_bootp_filename;
  92 static QTAILQ_HEAD(slirp_stacks, SlirpState) slirp_stacks =
  93     QTAILQ_HEAD_INITIALIZER(slirp_stacks);
  94
  95 static int slirp_hostfwd(SlirpState *s, const char *redir_str,
  96                          int legacy_format, Error **errp);
  97 static int slirp_guestfwd(SlirpState *s, const char *config_str,
  98                           int legacy_format, Error **errp);
  99
 100 #ifndef _WIN32
 101 static const char *legacy_smb_export;
 102
 103 static int slirp_smb(SlirpState *s, const char *exported_dir,
 104                      struct in_addr vserver_addr, Error **errp);
 105 static void slirp_smb_cleanup(SlirpState *s);
 106 #else
 107 static inline void slirp_smb_cleanup(SlirpState *s) { }
 108 #endif
 109
 110 void slirp_output(void *opaque, const uint8_t *pkt, int pkt_len)
 111 {
 112     SlirpState *s = opaque;
 113
 114     qemu_send_packet(&s->nc, pkt, pkt_len);
 115 }
 116
 117 static ssize_t net_slirp_receive(NetClientState *nc, const uint8_t *buf, size_t size)
 118 {
 119     SlirpState *s = DO_UPCAST(SlirpState, nc, nc);
 120
 121     slirp_input(s->slirp, buf, size);
 122
 123     return size;
 124 }
 125
 126 static void slirp_smb_exit(Notifier *n, void *data)
 127 {
 128     SlirpState *s = container_of(n, SlirpState, exit_notifier);
 129     slirp_smb_cleanup(s);
 130 }
 131
 132 static void net_slirp_cleanup(NetClientState *nc)
 133 {
 134     SlirpState *s = DO_UPCAST(SlirpState, nc, nc);
 135
 136     slirp_cleanup(s->slirp);
 137     if (s->exit_notifier.notify) {
 138         qemu_remove_exit_notifier(&s->exit_notifier);
 139     }
 140     slirp_smb_cleanup(s);
 141     QTAILQ_REMOVE(&slirp_stacks, s, entry);
 142 }
 143
 144 static NetClientInfo net_slirp_info = {
 145     .type = NET_CLIENT_DRIVER_USER,
 146     .size = sizeof(SlirpState),
 147     .receive = net_slirp_receive,
 148     .cleanup = net_slirp_cleanup,
 149 };
 150
 151 static int net_slirp_init(NetClientState *peer, const char *model,
 152                           const char *name, int restricted,
 153                           bool ipv4, const char *vnetwork, const char *vhost,
 154                           bool ipv6, const char *vprefix6, int vprefix6_len,
 155                           const char *vhost6,
 156                           const char *vhostname, const char *tftp_export,
 157                           const char *bootfile, const char *vdhcp_start,
 158                           const char *vnameserver, const char *vnameserver6,
 159                           const char *smb_export, const char *vsmbserver,
 160                           const char **dnssearch, const char *vdomainname,
 161                           Error **errp)
 162 {
 163     /* default settings according to historic slirp */
 164     struct in_addr net  = { .s_addr = htonl(0x0a000200) }; /* 10.0.2.0 */
 165     struct in_addr mask = { .s_addr = htonl(0xffffff00) }; /* 255.255.255.0 */
 166     struct in_addr host = { .s_addr = htonl(0x0a000202) }; /* 10.0.2.2 */
 167     struct in_addr dhcp = { .s_addr = htonl(0x0a00020f) }; /* 10.0.2.15 */
 168     struct in_addr dns  = { .s_addr = htonl(0x0a000203) }; /* 10.0.2.3 */
 169     struct in6_addr ip6_prefix;
 170     struct in6_addr ip6_host;
 171     struct in6_addr ip6_dns;
 172 #ifndef _WIN32
 173     struct in_addr smbsrv = { .s_addr = 0 };
 174 #endif
 175     NetClientState *nc;
 176     SlirpState *s;
 177     char buf[20];
 178     uint32_t addr;
 179     int shift;
 180     char *end;
 181     struct slirp_config_str *config;
 182
 183     if (!ipv4 && (vnetwork || vhost || vnameserver)) {
 184         error_setg(errp, "IPv4 disabled but netmask/host/dns provided");
 185         return -1;
 186     }
 187
 188     if (!ipv6 && (vprefix6 || vhost6 || vnameserver6)) {
 189         error_setg(errp, "IPv6 disabled but prefix/host6/dns6 provided");
 190         return -1;
 191     }
 192
 193     if (!ipv4 && !ipv6) {
 194         /* It doesn't make sense to disable both */
 195         error_setg(errp, "IPv4 and IPv6 disabled");
 196         return -1;
 197     }
 198
 199     if (!tftp_export) {
 200         tftp_export = legacy_tftp_prefix;
 201     }
 202     if (!bootfile) {
 203         bootfile = legacy_bootp_filename;
 204     }
 205
 206     if (vnetwork) {
 207         if (get_str_sep(buf, sizeof(buf), &vnetwork, '/') < 0) {
 208             if (!inet_aton(vnetwork, &net)) {
 209                 error_setg(errp, "Failed to parse netmask");
 210                 return -1;
 211             }
 212             addr = ntohl(net.s_addr);
 213             if (!(addr & 0x80000000)) {
 214                 mask.s_addr = htonl(0xff000000); /* class A */
 215             } else if ((addr & 0xfff00000) == 0xac100000) {
 216                 mask.s_addr = htonl(0xfff00000); /* priv. 172.16.0.0/12 */
 217             } else if ((addr & 0xc0000000) == 0x80000000) {
 218                 mask.s_addr = htonl(0xffff0000); /* class B */
 219             } else if ((addr & 0xffff0000) == 0xc0a80000) {
 220                 mask.s_addr = htonl(0xffff0000); /* priv. 192.168.0.0/16 */
 221             } else if ((addr & 0xffff0000) == 0xc6120000) {
 222                 mask.s_addr = htonl(0xfffe0000); /* tests 198.18.0.0/15 */
 223             } else if ((addr & 0xe0000000) == 0xe0000000) {
 224                 mask.s_addr = htonl(0xffffff00); /* class C */
 225             } else {
 226                 mask.s_addr = htonl(0xfffffff0); /* multicast/reserved */
 227             }
 228         } else {
 229             if (!inet_aton(buf, &net)) {
 230                 error_setg(errp, "Failed to parse netmask");
 231                 return -1;
 232             }
 233             shift = strtol(vnetwork, &end, 10);
 234             if (*end != '\0') {
 235                 if (!inet_aton(vnetwork, &mask)) {
 236                     error_setg(errp,
 237                                "Failed to parse netmask (trailing chars)");
 238                     return -1;
 239                 }
 240             } else if (shift < 4 || shift > 32) {
 241                 error_setg(errp,
 242                            "Invalid netmask provided (must be in range 4-32)");
 243                 return -1;
 244             } else {
 245                 mask.s_addr = htonl(0xffffffff << (32 - shift));
 246             }
 247         }
 248         net.s_addr &= mask.s_addr;
 249         host.s_addr = net.s_addr | (htonl(0x0202) & ~mask.s_addr);
 250         dhcp.s_addr = net.s_addr | (htonl(0x020f) & ~mask.s_addr);
 251         dns.s_addr  = net.s_addr | (htonl(0x0203) & ~mask.s_addr);
 252     }
 253
 254     if (vhost && !inet_aton(vhost, &host)) {
 255         error_setg(errp, "Failed to parse host");
 256         return -1;
 257     }
 258     if ((host.s_addr & mask.s_addr) != net.s_addr) {
 259         error_setg(errp, "Host doesn't belong to network");
 260         return -1;
 261     }
 262
 263     if (vnameserver && !inet_aton(vnameserver, &dns)) {
 264         error_setg(errp, "Failed to parse DNS");
 265         return -1;
 266     }
 267     if ((dns.s_addr & mask.s_addr) != net.s_addr) {
 268         error_setg(errp, "DNS doesn't belong to network");
 269         return -1;
 270     }
 271     if (dns.s_addr == host.s_addr) {
 272         error_setg(errp, "DNS must be different from host");
 273         return -1;
 274     }
 275
 276     if (vdhcp_start && !inet_aton(vdhcp_start, &dhcp)) {
 277         error_setg(errp, "Failed to parse DHCP start address");
 278         return -1;
 279     }
 280     if ((dhcp.s_addr & mask.s_addr) != net.s_addr) {
 281         error_setg(errp, "DHCP doesn't belong to network");
 282         return -1;
 283     }
 284     if (dhcp.s_addr == host.s_addr || dhcp.s_addr == dns.s_addr) {
 285         error_setg(errp, "DNS must be different from host and DNS");
 286         return -1;
 287     }
 288
 289 #ifndef _WIN32
 290     if (vsmbserver && !inet_aton(vsmbserver, &smbsrv)) {
 291         error_setg(errp, "Failed to parse SMB address");
 292         return -1;
 293     }
 294 #endif
 295
 296 #if defined(_WIN32) && (_WIN32_WINNT < 0x0600)
 297     /* No inet_pton helper before Vista... */
 298     if (vprefix6) {
 299         /* Unsupported */
 300         error_setg(errp, "IPv6 prefix not supported");
 301         return -1;
 302     }
 303     memset(&ip6_prefix, 0, sizeof(ip6_prefix));
 304     ip6_prefix.s6_addr[0] = 0xfe;
 305     ip6_prefix.s6_addr[1] = 0xc0;
 306 #else
 307     if (!vprefix6) {
 308         vprefix6 = "fec0::";
 309     }
 310     if (!inet_pton(AF_INET6, vprefix6, &ip6_prefix)) {
 311         error_setg(errp, "Failed to parse IPv6 prefix");
 312         return -1;
 313     }
 314 #endif
 315
 316     if (!vprefix6_len) {
 317         vprefix6_len = 64;
 318     }
 319     if (vprefix6_len < 0 || vprefix6_len > 126) {
 320         error_setg(errp,
 321                    "Invalid prefix provided (prefix len must be in range 0-126");
 322         return -1;
 323     }
 324
 325     if (vhost6) {
 326 #if defined(_WIN32) && (_WIN32_WINNT < 0x0600)
 327         error_setg(errp, "IPv6 host not supported");
 328         return -1;
 329 #else
 330         if (!inet_pton(AF_INET6, vhost6, &ip6_host)) {
 331             error_setg(errp, "Failed to parse IPv6 host");
 332             return -1;
 333         }
 334         if (!in6_equal_net(&ip6_prefix, &ip6_host, vprefix6_len)) {
 335             error_setg(errp, "IPv6 Host doesn't belong to network");
 336             return -1;
 337         }
 338 #endif
 339     } else {
 340         ip6_host = ip6_prefix;
 341         ip6_host.s6_addr[15] |= 2;
 342     }
 343
 344     if (vnameserver6) {
 345 #if defined(_WIN32) && (_WIN32_WINNT < 0x0600)
 346         error_setg(errp, "IPv6 DNS not supported");
 347         return -1;
 348 #else
 349         if (!inet_pton(AF_INET6, vnameserver6, &ip6_dns)) {
 350             error_setg(errp, "Failed to parse IPv6 DNS");
 351             return -1;
 352         }
 353         if (!in6_equal_net(&ip6_prefix, &ip6_dns, vprefix6_len)) {
 354             error_setg(errp, "IPv6 DNS doesn't belong to network");
 355             return -1;
 356         }
 357 #endif
 358     } else {
 359         ip6_dns = ip6_prefix;
 360         ip6_dns.s6_addr[15] |= 3;
 361     }
 362
 363     if (vdomainname && !*vdomainname) {
 364         error_setg(errp, "'domainname' parameter cannot be empty");
 365         return -1;
 366     }
 367
 368
 369     nc = qemu_new_net_client(&net_slirp_info, peer, model, name);
 370
 371     snprintf(nc->info_str, sizeof(nc->info_str),
 372              "net=%s,restrict=%s", inet_ntoa(net),
 373              restricted ? "on" : "off");
 374
 375     s = DO_UPCAST(SlirpState, nc, nc);
 376
 377     s->slirp = slirp_init(restricted, ipv4, net, mask, host,
 378                           ipv6, ip6_prefix, vprefix6_len, ip6_host,
 379                           vhostname, tftp_export, bootfile, dhcp,
 380                           dns, ip6_dns, dnssearch, vdomainname, s);
 381     QTAILQ_INSERT_TAIL(&slirp_stacks, s, entry);
 382
 383     for (config = slirp_configs; config; config = config->next) {
 384         if (config->flags & SLIRP_CFG_HOSTFWD) {
 385             if (slirp_hostfwd(s, config->str,
 386                               config->flags & SLIRP_CFG_LEGACY, errp) < 0) {
 387                 goto error;
 388             }
 389         } else {
 390             if (slirp_guestfwd(s, config->str,
 391                                config->flags & SLIRP_CFG_LEGACY, errp) < 0) {
 392                 goto error;
 393             }
 394         }
 395     }
 396 #ifndef _WIN32
 397     if (!smb_export) {
 398         smb_export = legacy_smb_export;
 399     }
 400     if (smb_export) {
 401         if (slirp_smb(s, smb_export, smbsrv, errp) < 0) {
 402             goto error;
 403         }
 404     }
 405 #endif
 406
 407     s->exit_notifier.notify = slirp_smb_exit;
 408     qemu_add_exit_notifier(&s->exit_notifier);
 409     return 0;
 410
 411 error:
 412     qemu_del_net_client(nc);
 413     return -1;
 414 }
 415
 416 static SlirpState *slirp_lookup(Monitor *mon, const char *hub_id,
 417                                 const char *name)
 418 {
 419     if (name) {
 420         NetClientState *nc;
 421         if (hub_id) {
 422             nc = net_hub_find_client_by_name(strtol(hub_id, NULL, 0), name);
 423             if (!nc) {
 424                 monitor_printf(mon, "unrecognized (hub-id, stackname) pair\n");
 425                 return NULL;
 426             }
 427         } else {
 428             nc = qemu_find_netdev(name);
 429             if (!nc) {
 430                 monitor_printf(mon, "unrecognized netdev id '%s'\n", name);
 431                 return NULL;
 432             }
 433         }
 434         if (strcmp(nc->model, "user")) {
 435             monitor_printf(mon, "invalid device specified\n");
 436             return NULL;
 437         }
 438         return DO_UPCAST(SlirpState, nc, nc);
 439     } else {
 440         if (QTAILQ_EMPTY(&slirp_stacks)) {
 441             monitor_printf(mon, "user mode network stack not in use\n");
 442             return NULL;
 443         }
 444         return QTAILQ_FIRST(&slirp_stacks);
 445     }
 446 }
 447
 448 void hmp_hostfwd_remove(Monitor *mon, const QDict *qdict)
 449 {
 450     struct in_addr host_addr = { .s_addr = INADDR_ANY };
 451     int host_port;
 452     char buf[256];
 453     const char *src_str, *p;
 454     SlirpState *s;
 455     int is_udp = 0;
 456     int err;
 457     const char *arg1 = qdict_get_str(qdict, "arg1");
 458     const char *arg2 = qdict_get_try_str(qdict, "arg2");
 459     const char *arg3 = qdict_get_try_str(qdict, "arg3");
 460
 461     if (arg3) {
 462         s = slirp_lookup(mon, arg1, arg2);
 463         src_str = arg3;
 464     } else if (arg2) {
 465         s = slirp_lookup(mon, NULL, arg1);
 466         src_str = arg2;
 467     } else {
 468         s = slirp_lookup(mon, NULL, NULL);
 469         src_str = arg1;
 470     }
 471     if (!s) {
 472         return;
 473     }
 474
 475     p = src_str;
 476     if (!p || get_str_sep(buf, sizeof(buf), &p, ':') < 0) {
 477         goto fail_syntax;
 478     }
 479
 480     if (!strcmp(buf, "tcp") || buf[0] == '\0') {
 481         is_udp = 0;
 482     } else if (!strcmp(buf, "udp")) {
 483         is_udp = 1;
 484     } else {
 485         goto fail_syntax;
 486     }
 487
 488     if (get_str_sep(buf, sizeof(buf), &p, ':') < 0) {
 489         goto fail_syntax;
 490     }
 491     if (buf[0] != '\0' && !inet_aton(buf, &host_addr)) {
 492         goto fail_syntax;
 493     }
 494
 495     if (qemu_strtoi(p, NULL, 10, &host_port)) {
 496         goto fail_syntax;
 497     }
 498
 499     err = slirp_remove_hostfwd(s->slirp, is_udp, host_addr, host_port);
 500
 501     monitor_printf(mon, "host forwarding rule for %s %s\n", src_str,
 502                    err ? "not found" : "removed");
 503     return;
 504
 505  fail_syntax:
 506     monitor_printf(mon, "invalid format\n");
 507 }
 508
 509 static int slirp_hostfwd(SlirpState *s, const char *redir_str,
 510                          int legacy_format, Error **errp)
 511 {
 512     struct in_addr host_addr = { .s_addr = INADDR_ANY };
 513     struct in_addr guest_addr = { .s_addr = 0 };
 514     int host_port, guest_port;
 515     const char *p;
 516     char buf[256];
 517     int is_udp;
 518     char *end;
 519     const char *fail_reason = "Unknown reason";
 520
 521     p = redir_str;
 522     if (!p || get_str_sep(buf, sizeof(buf), &p, ':') < 0) {
 523         fail_reason = "No : separators";
 524         goto fail_syntax;
 525     }
 526     if (!strcmp(buf, "tcp") || buf[0] == '\0') {
 527         is_udp = 0;
 528     } else if (!strcmp(buf, "udp")) {
 529         is_udp = 1;
 530     } else {
 531         fail_reason = "Bad protocol name";
 532         goto fail_syntax;
 533     }
 534
 535     if (!legacy_format) {
 536         if (get_str_sep(buf, sizeof(buf), &p, ':') < 0) {
 537             fail_reason = "Missing : separator";
 538             goto fail_syntax;
 539         }
 540         if (buf[0] != '\0' && !inet_aton(buf, &host_addr)) {
 541             fail_reason = "Bad host address";
 542             goto fail_syntax;
 543         }
 544     }
 545
 546     if (get_str_sep(buf, sizeof(buf), &p, legacy_format ? ':' : '-') < 0) {
 547         fail_reason = "Bad host port separator";
 548         goto fail_syntax;
 549     }
 550     host_port = strtol(buf, &end, 0);
 551     if (*end != '\0' || host_port < 0 || host_port > 65535) {
 552         fail_reason = "Bad host port";
 553         goto fail_syntax;
 554     }
 555
 556     if (get_str_sep(buf, sizeof(buf), &p, ':') < 0) {
 557         fail_reason = "Missing guest address";
 558         goto fail_syntax;
 559     }
 560     if (buf[0] != '\0' && !inet_aton(buf, &guest_addr)) {
 561         fail_reason = "Bad guest address";
 562         goto fail_syntax;
 563     }
 564
 565     guest_port = strtol(p, &end, 0);
 566     if (*end != '\0' || guest_port < 1 || guest_port > 65535) {
 567         fail_reason = "Bad guest port";
 568         goto fail_syntax;
 569     }
 570
 571     if (slirp_add_hostfwd(s->slirp, is_udp, host_addr, host_port, guest_addr,
 572                           guest_port) < 0) {
 573         error_setg(errp, "Could not set up host forwarding rule '%s'",
 574                    redir_str);
 575         return -1;
 576     }
 577     return 0;
 578
 579  fail_syntax:
 580     error_setg(errp, "Invalid host forwarding rule '%s' (%s)", redir_str,
 581                fail_reason);
 582     return -1;
 583 }
 584
 585 void hmp_hostfwd_add(Monitor *mon, const QDict *qdict)
 586 {
 587     const char *redir_str;
 588     SlirpState *s;
 589     const char *arg1 = qdict_get_str(qdict, "arg1");
 590     const char *arg2 = qdict_get_try_str(qdict, "arg2");
 591     const char *arg3 = qdict_get_try_str(qdict, "arg3");
 592
 593     if (arg3) {
 594         s = slirp_lookup(mon, arg1, arg2);
 595         redir_str = arg3;
 596     } else if (arg2) {
 597         s = slirp_lookup(mon, NULL, arg1);
 598         redir_str = arg2;
 599     } else {
 600         s = slirp_lookup(mon, NULL, NULL);
 601         redir_str = arg1;
 602     }
 603     if (s) {
 604         Error *err = NULL;
 605         if (slirp_hostfwd(s, redir_str, 0, &err) < 0) {
 606             error_report_err(err);
 607         }
 608     }
 609
 610 }
 611
 612 int net_slirp_redir(const char *redir_str)
 613 {
 614     struct slirp_config_str *config;
 615     Error *err = NULL;
 616     int res;
 617
 618     if (QTAILQ_EMPTY(&slirp_stacks)) {
 619         config = g_malloc(sizeof(*config));
 620         pstrcpy(config->str, sizeof(config->str), redir_str);
 621         config->flags = SLIRP_CFG_HOSTFWD | SLIRP_CFG_LEGACY;
 622         config->next = slirp_configs;
 623         slirp_configs = config;
 624         return 0;
 625     }
 626
 627     res = slirp_hostfwd(QTAILQ_FIRST(&slirp_stacks), redir_str, 1, &err);
 628     if (res < 0) {
 629         error_report_err(err);
 630     }
 631     return res;
 632 }
 633
 634 #ifndef _WIN32
 635
 636 /* automatic user mode samba server configuration */
 637 static void slirp_smb_cleanup(SlirpState *s)
 638 {
 639     int ret;
 640
 641     if (s->smb_dir) {
 642         gchar *cmd = g_strdup_printf("rm -rf %s", s->smb_dir);
 643         ret = system(cmd);
 644         if (ret == -1 || !WIFEXITED(ret)) {
 645             error_report("'%s' failed.", cmd);
 646         } else if (WEXITSTATUS(ret)) {
 647             error_report("'%s' failed. Error code: %d",
 648                          cmd, WEXITSTATUS(ret));
 649         }
 650         g_free(cmd);
 651         g_free(s->smb_dir);
 652         s->smb_dir = NULL;
 653     }
 654 }
 655
 656 static int slirp_smb(SlirpState* s, const char *exported_dir,
 657                      struct in_addr vserver_addr, Error **errp)
 658 {
 659     char *smb_conf;
 660     char *smb_cmdline;
 661     struct passwd *passwd;
 662     FILE *f;
 663
 664     passwd = getpwuid(geteuid());
 665     if (!passwd) {
 666         error_setg(errp, "Failed to retrieve user name");
 667         return -1;
 668     }
 669
 670     if (access(CONFIG_SMBD_COMMAND, F_OK)) {
 671         error_setg(errp, "Could not find '%s', please install it",
 672                    CONFIG_SMBD_COMMAND);
 673         return -1;
 674     }
 675
 676     if (access(exported_dir, R_OK | X_OK)) {
 677         error_setg(errp, "Error accessing shared directory '%s': %s",
 678                    exported_dir, strerror(errno));
 679         return -1;
 680     }
 681
 682     s->smb_dir = g_dir_make_tmp("qemu-smb.XXXXXX", NULL);
 683     if (!s->smb_dir) {
 684         error_setg(errp, "Could not create samba server dir");
 685         return -1;
 686     }
 687     smb_conf = g_strdup_printf("%s/%s", s->smb_dir, "smb.conf");
 688
 689     f = fopen(smb_conf, "w");
 690     if (!f) {
 691         slirp_smb_cleanup(s);
 692         error_setg(errp,
 693                    "Could not create samba server configuration file '%s'",
 694                     smb_conf);
 695         g_free(smb_conf);
 696         return -1;
 697     }
 698     fprintf(f,
 699             "[global]\n"
 700             "private dir=%s\n"
 701             "interfaces=127.0.0.1\n"
 702             "bind interfaces only=yes\n"
 703             "pid directory=%s\n"
 704             "lock directory=%s\n"
 705             "state directory=%s\n"
 706             "cache directory=%s\n"
 707             "ncalrpc dir=%s/ncalrpc\n"
 708             "log file=%s/log.smbd\n"
 709             "smb passwd file=%s/smbpasswd\n"
 710             "security = user\n"
 711             "map to guest = Bad User\n"
 712             "load printers = no\n"
 713             "printing = bsd\n"
 714             "disable spoolss = yes\n"
 715             "usershare max shares = 0\n"
 716             "[qemu]\n"
 717             "path=%s\n"
 718             "read only=no\n"
 719             "guest ok=yes\n"
 720             "force user=%s\n",
 721             s->smb_dir,
 722             s->smb_dir,
 723             s->smb_dir,
 724             s->smb_dir,
 725             s->smb_dir,
 726             s->smb_dir,
 727             s->smb_dir,
 728             s->smb_dir,
 729             exported_dir,
 730             passwd->pw_name
 731             );
 732     fclose(f);
 733
 734     smb_cmdline = g_strdup_printf("%s -l %s -s %s",
 735              CONFIG_SMBD_COMMAND, s->smb_dir, smb_conf);
 736     g_free(smb_conf);
 737
 738     if (slirp_add_exec(s->slirp, 0, smb_cmdline, &vserver_addr, 139) < 0 ||
 739         slirp_add_exec(s->slirp, 0, smb_cmdline, &vserver_addr, 445) < 0) {
 740         slirp_smb_cleanup(s);
 741         g_free(smb_cmdline);
 742         error_setg(errp, "Conflicting/invalid smbserver address");
 743         return -1;
 744     }
 745     g_free(smb_cmdline);
 746     return 0;
 747 }
 748
 749 /* automatic user mode samba server configuration (legacy interface) */
 750 int net_slirp_smb(const char *exported_dir)
 751 {
 752     struct in_addr vserver_addr = { .s_addr = 0 };
 753
 754     if (legacy_smb_export) {
 755         fprintf(stderr, "-smb given twice\n");
 756         return -1;
 757     }
 758     legacy_smb_export = exported_dir;
 759     if (!QTAILQ_EMPTY(&slirp_stacks)) {
 760         Error *err = NULL;
 761         int res = slirp_smb(QTAILQ_FIRST(&slirp_stacks), exported_dir,
 762                             vserver_addr, &err);
 763         if (res < 0) {
 764             error_report_err(err);
 765         }
 766         return res;
 767     }
 768     return 0;
 769 }
 770
 771 #endif /* !defined(_WIN32) */
 772
 773 struct GuestFwd {
 774     CharBackend hd;
 775     struct in_addr server;
 776     int port;
 777     Slirp *slirp;
 778 };
 779
 780 static int guestfwd_can_read(void *opaque)
 781 {
 782     struct GuestFwd *fwd = opaque;
 783     return slirp_socket_can_recv(fwd->slirp, fwd->server, fwd->port);
 784 }
 785
 786 static void guestfwd_read(void *opaque, const uint8_t *buf, int size)
 787 {
 788     struct GuestFwd *fwd = opaque;
 789     slirp_socket_recv(fwd->slirp, fwd->server, fwd->port, buf, size);
 790 }
 791
 792 static int slirp_guestfwd(SlirpState *s, const char *config_str,
 793                           int legacy_format, Error **errp)
 794 {
 795     struct in_addr server = { .s_addr = 0 };
 796     struct GuestFwd *fwd;
 797     const char *p;
 798     char buf[128];
 799     char *end;
 800     int port;
 801
 802     p = config_str;
 803     if (legacy_format) {
 804         if (get_str_sep(buf, sizeof(buf), &p, ':') < 0) {
 805             goto fail_syntax;
 806         }
 807     } else {
 808         if (get_str_sep(buf, sizeof(buf), &p, ':') < 0) {
 809             goto fail_syntax;
 810         }
 811         if (strcmp(buf, "tcp") && buf[0] != '\0') {
 812             goto fail_syntax;
 813         }
 814         if (get_str_sep(buf, sizeof(buf), &p, ':') < 0) {
 815             goto fail_syntax;
 816         }
 817         if (buf[0] != '\0' && !inet_aton(buf, &server)) {
 818             goto fail_syntax;
 819         }
 820         if (get_str_sep(buf, sizeof(buf), &p, '-') < 0) {
 821             goto fail_syntax;
 822         }
 823     }
 824     port = strtol(buf, &end, 10);
 825     if (*end != '\0' || port < 1 || port > 65535) {
 826         goto fail_syntax;
 827     }
 828
 829     snprintf(buf, sizeof(buf), "guestfwd.tcp.%d", port);
 830
 831     if ((strlen(p) > 4) && !strncmp(p, "cmd:", 4)) {
 832         if (slirp_add_exec(s->slirp, 0, &p[4], &server, port) < 0) {
 833             error_setg(errp, "Conflicting/invalid host:port in guest "
 834                        "forwarding rule '%s'", config_str);
 835             return -1;
 836         }
 837     } else {
 838         Error *err = NULL;
 839         Chardev *chr = qemu_chr_new(buf, p);
 840
 841         if (!chr) {
 842             error_setg(errp, "Could not open guest forwarding device '%s'",
 843                        buf);
 844             return -1;
 845         }
 846
 847         fwd = g_new(struct GuestFwd, 1);
 848         qemu_chr_fe_init(&fwd->hd, chr, &err);
 849         if (err) {
 850             error_propagate(errp, err);
 851             g_free(fwd);
 852             return -1;
 853         }
 854
 855         if (slirp_add_exec(s->slirp, 3, &fwd->hd, &server, port) < 0) {
 856             error_setg(errp, "Conflicting/invalid host:port in guest "
 857                        "forwarding rule '%s'", config_str);
 858             g_free(fwd);
 859             return -1;
 860         }
 861         fwd->server = server;
 862         fwd->port = port;
 863         fwd->slirp = s->slirp;
 864
 865         qemu_chr_fe_set_handlers(&fwd->hd, guestfwd_can_read, guestfwd_read,
 866                                  NULL, NULL, fwd, NULL, true);
 867     }
 868     return 0;
 869
 870  fail_syntax:
 871     error_setg(errp, "Invalid guest forwarding rule '%s'", config_str);
 872     return -1;
 873 }
 874
 875 void hmp_info_usernet(Monitor *mon, const QDict *qdict)
 876 {
 877     SlirpState *s;
 878
 879     QTAILQ_FOREACH(s, &slirp_stacks, entry) {
 880         int id;
 881         bool got_hub_id = net_hub_id_for_client(&s->nc, &id) == 0;
 882         monitor_printf(mon, "Hub %d (%s):\n",
 883                        got_hub_id ? id : -1,
 884                        s->nc.name);
 885         slirp_connection_info(s->slirp, mon);
 886     }
 887 }
 888
 889 static void
 890 net_init_slirp_configs(const StringList *fwd, int flags)
 891 {
 892     while (fwd) {
 893         struct slirp_config_str *config;
 894
 895         config = g_malloc0(sizeof(*config));
 896         pstrcpy(config->str, sizeof(config->str), fwd->value->str);
 897         config->flags = flags;
 898         config->next = slirp_configs;
 899         slirp_configs = config;
 900
 901         fwd = fwd->next;
 902     }
 903 }
 904
 905 static const char **slirp_dnssearch(const StringList *dnsname)
 906 {
 907     const StringList *c = dnsname;
 908     size_t i = 0, num_opts = 0;
 909     const char **ret;
 910
 911     while (c) {
 912         num_opts++;
 913         c = c->next;
 914     }
 915
 916     if (num_opts == 0) {
 917         return NULL;
 918     }
 919
 920     ret = g_malloc((num_opts + 1) * sizeof(*ret));
 921     c = dnsname;
 922     while (c) {
 923         ret[i++] = c->value->str;
 924         c = c->next;
 925     }
 926     ret[i] = NULL;
 927     return ret;
 928 }
 929
 930 int net_init_slirp(const Netdev *netdev, const char *name,
 931                    NetClientState *peer, Error **errp)
 932 {
 933     struct slirp_config_str *config;
 934     char *vnet;
 935     int ret;
 936     const NetdevUserOptions *user;
 937     const char **dnssearch;
 938     bool ipv4 = true, ipv6 = true;
 939
 940     assert(netdev->type == NET_CLIENT_DRIVER_USER);
 941     user = &netdev->u.user;
 942
 943     if ((user->has_ipv6 && user->ipv6 && !user->has_ipv4) ||
 944         (user->has_ipv4 && !user->ipv4)) {
 945         ipv4 = 0;
 946     }
 947     if ((user->has_ipv4 && user->ipv4 && !user->has_ipv6) ||
 948         (user->has_ipv6 && !user->ipv6)) {
 949         ipv6 = 0;
 950     }
 951
 952     vnet = user->has_net ? g_strdup(user->net) :
 953            user->has_ip  ? g_strdup_printf("%s/24", user->ip) :
 954            NULL;
 955
 956     dnssearch = slirp_dnssearch(user->dnssearch);
 957
 958     /* all optional fields are initialized to "all bits zero" */
 959
 960     net_init_slirp_configs(user->hostfwd, SLIRP_CFG_HOSTFWD);
 961     net_init_slirp_configs(user->guestfwd, 0);
 962
 963     ret = net_slirp_init(peer, "user", name, user->q_restrict,
 964                          ipv4, vnet, user->host,
 965                          ipv6, user->ipv6_prefix, user->ipv6_prefixlen,
 966                          user->ipv6_host, user->hostname, user->tftp,
 967                          user->bootfile, user->dhcpstart,
 968                          user->dns, user->ipv6_dns, user->smb,
 969                          user->smbserver, dnssearch, user->domainname, errp);
 970
 971     while (slirp_configs) {
 972         config = slirp_configs;
 973         slirp_configs = config->next;
 974         g_free(config);
 975     }
 976
 977     g_free(vnet);
 978     g_free(dnssearch);
 979
 980     return ret;
 981 }