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