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 #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                           bool ipv4, const char *vnetwork, const char *vhost,
 140                           bool ipv6, 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 (!ipv4 && (vnetwork || vhost || vnameserver)) {
 169         return -1;
 170     }
 171
 172     if (!ipv6 && (vprefix6 || vhost6 || vnameserver6)) {
 173         return -1;
 174     }
 175
 176     if (!ipv4 && !ipv6) {
 177         /* It doesn't make sense to disable both */
 178         return -1;
 179     }
 180
 181     if (!tftp_export) {
 182         tftp_export = legacy_tftp_prefix;
 183     }
 184     if (!bootfile) {
 185         bootfile = legacy_bootp_filename;
 186     }
 187
 188     if (vnetwork) {
 189         if (get_str_sep(buf, sizeof(buf), &vnetwork, '/') < 0) {
 190             if (!inet_aton(vnetwork, &net)) {
 191                 return -1;
 192             }
 193             addr = ntohl(net.s_addr);
 194             if (!(addr & 0x80000000)) {
 195                 mask.s_addr = htonl(0xff000000); /* class A */
 196             } else if ((addr & 0xfff00000) == 0xac100000) {
 197                 mask.s_addr = htonl(0xfff00000); /* priv. 172.16.0.0/12 */
 198             } else if ((addr & 0xc0000000) == 0x80000000) {
 199                 mask.s_addr = htonl(0xffff0000); /* class B */
 200             } else if ((addr & 0xffff0000) == 0xc0a80000) {
 201                 mask.s_addr = htonl(0xffff0000); /* priv. 192.168.0.0/16 */
 202             } else if ((addr & 0xffff0000) == 0xc6120000) {
 203                 mask.s_addr = htonl(0xfffe0000); /* tests 198.18.0.0/15 */
 204             } else if ((addr & 0xe0000000) == 0xe0000000) {
 205                 mask.s_addr = htonl(0xffffff00); /* class C */
 206             } else {
 207                 mask.s_addr = htonl(0xfffffff0); /* multicast/reserved */
 208             }
 209         } else {
 210             if (!inet_aton(buf, &net)) {
 211                 return -1;
 212             }
 213             shift = strtol(vnetwork, &end, 10);
 214             if (*end != '\0') {
 215                 if (!inet_aton(vnetwork, &mask)) {
 216                     return -1;
 217                 }
 218             } else if (shift < 4 || shift > 32) {
 219                 return -1;
 220             } else {
 221                 mask.s_addr = htonl(0xffffffff << (32 - shift));
 222             }
 223         }
 224         net.s_addr &= mask.s_addr;
 225         host.s_addr = net.s_addr | (htonl(0x0202) & ~mask.s_addr);
 226         dhcp.s_addr = net.s_addr | (htonl(0x020f) & ~mask.s_addr);
 227         dns.s_addr  = net.s_addr | (htonl(0x0203) & ~mask.s_addr);
 228     }
 229
 230     if (vhost && !inet_aton(vhost, &host)) {
 231         return -1;
 232     }
 233     if ((host.s_addr & mask.s_addr) != net.s_addr) {
 234         return -1;
 235     }
 236
 237     if (vnameserver && !inet_aton(vnameserver, &dns)) {
 238         return -1;
 239     }
 240     if ((dns.s_addr & mask.s_addr) != net.s_addr ||
 241         dns.s_addr == host.s_addr) {
 242         return -1;
 243     }
 244
 245     if (vdhcp_start && !inet_aton(vdhcp_start, &dhcp)) {
 246         return -1;
 247     }
 248     if ((dhcp.s_addr & mask.s_addr) != net.s_addr ||
 249         dhcp.s_addr == host.s_addr || dhcp.s_addr == dns.s_addr) {
 250         return -1;
 251     }
 252
 253 #ifndef _WIN32
 254     if (vsmbserver && !inet_aton(vsmbserver, &smbsrv)) {
 255         return -1;
 256     }
 257 #endif
 258
 259 #if defined(_WIN32) && (_WIN32_WINNT < 0x0600)
 260     /* No inet_pton helper before Vista... */
 261     if (vprefix6) {
 262         /* Unsupported */
 263         return -1;
 264     }
 265     memset(&ip6_prefix, 0, sizeof(ip6_prefix));
 266     ip6_prefix.s6_addr[0] = 0xfe;
 267     ip6_prefix.s6_addr[1] = 0xc0;
 268 #else
 269     if (!vprefix6) {
 270         vprefix6 = "fec0::";
 271     }
 272     if (!inet_pton(AF_INET6, vprefix6, &ip6_prefix)) {
 273         return -1;
 274     }
 275 #endif
 276
 277     if (!vprefix6_len) {
 278         vprefix6_len = 64;
 279     }
 280     if (vprefix6_len < 0 || vprefix6_len > 126) {
 281         return -1;
 282     }
 283
 284     if (vhost6) {
 285 #if defined(_WIN32) && (_WIN32_WINNT < 0x0600)
 286         return -1;
 287 #else
 288         if (!inet_pton(AF_INET6, vhost6, &ip6_host)) {
 289             return -1;
 290         }
 291         if (!in6_equal_net(&ip6_prefix, &ip6_host, vprefix6_len)) {
 292             return -1;
 293         }
 294 #endif
 295     } else {
 296         ip6_host = ip6_prefix;
 297         ip6_host.s6_addr[15] |= 2;
 298     }
 299
 300     if (vnameserver6) {
 301 #if defined(_WIN32) && (_WIN32_WINNT < 0x0600)
 302         return -1;
 303 #else
 304         if (!inet_pton(AF_INET6, vnameserver6, &ip6_dns)) {
 305             return -1;
 306         }
 307         if (!in6_equal_net(&ip6_prefix, &ip6_dns, vprefix6_len)) {
 308             return -1;
 309         }
 310 #endif
 311     } else {
 312         ip6_dns = ip6_prefix;
 313         ip6_dns.s6_addr[15] |= 3;
 314     }
 315
 316
 317     nc = qemu_new_net_client(&net_slirp_info, peer, model, name);
 318
 319     snprintf(nc->info_str, sizeof(nc->info_str),
 320              "net=%s,restrict=%s", inet_ntoa(net),
 321              restricted ? "on" : "off");
 322
 323     s = DO_UPCAST(SlirpState, nc, nc);
 324
 325     s->slirp = slirp_init(restricted, ipv4, net, mask, host,
 326                           ipv6, ip6_prefix, vprefix6_len, ip6_host,
 327                           vhostname, tftp_export, bootfile, dhcp,
 328                           dns, ip6_dns, dnssearch, s);
 329     QTAILQ_INSERT_TAIL(&slirp_stacks, s, entry);
 330
 331     for (config = slirp_configs; config; config = config->next) {
 332         if (config->flags & SLIRP_CFG_HOSTFWD) {
 333             if (slirp_hostfwd(s, config->str,
 334                               config->flags & SLIRP_CFG_LEGACY) < 0)
 335                 goto error;
 336         } else {
 337             if (slirp_guestfwd(s, config->str,
 338                                config->flags & SLIRP_CFG_LEGACY) < 0)
 339                 goto error;
 340         }
 341     }
 342 #ifndef _WIN32
 343     if (!smb_export) {
 344         smb_export = legacy_smb_export;
 345     }
 346     if (smb_export) {
 347         if (slirp_smb(s, smb_export, smbsrv) < 0)
 348             goto error;
 349     }
 350 #endif
 351
 352     return 0;
 353
 354 error:
 355     qemu_del_net_client(nc);
 356     return -1;
 357 }
 358
 359 static SlirpState *slirp_lookup(Monitor *mon, const char *vlan,
 360                                 const char *stack)
 361 {
 362
 363     if (vlan) {
 364         NetClientState *nc;
 365         nc = net_hub_find_client_by_name(strtol(vlan, NULL, 0), stack);
 366         if (!nc) {
 367             monitor_printf(mon, "unrecognized (vlan-id, stackname) pair\n");
 368             return NULL;
 369         }
 370         if (strcmp(nc->model, "user")) {
 371             monitor_printf(mon, "invalid device specified\n");
 372             return NULL;
 373         }
 374         return DO_UPCAST(SlirpState, nc, nc);
 375     } else {
 376         if (QTAILQ_EMPTY(&slirp_stacks)) {
 377             monitor_printf(mon, "user mode network stack not in use\n");
 378             return NULL;
 379         }
 380         return QTAILQ_FIRST(&slirp_stacks);
 381     }
 382 }
 383
 384 void hmp_hostfwd_remove(Monitor *mon, const QDict *qdict)
 385 {
 386     struct in_addr host_addr = { .s_addr = INADDR_ANY };
 387     int host_port;
 388     char buf[256];
 389     const char *src_str, *p;
 390     SlirpState *s;
 391     int is_udp = 0;
 392     int err;
 393     const char *arg1 = qdict_get_str(qdict, "arg1");
 394     const char *arg2 = qdict_get_try_str(qdict, "arg2");
 395     const char *arg3 = qdict_get_try_str(qdict, "arg3");
 396
 397     if (arg2) {
 398         s = slirp_lookup(mon, arg1, arg2);
 399         src_str = arg3;
 400     } else {
 401         s = slirp_lookup(mon, NULL, NULL);
 402         src_str = arg1;
 403     }
 404     if (!s) {
 405         return;
 406     }
 407
 408     p = src_str;
 409     if (!p || get_str_sep(buf, sizeof(buf), &p, ':') < 0) {
 410         goto fail_syntax;
 411     }
 412
 413     if (!strcmp(buf, "tcp") || buf[0] == '\0') {
 414         is_udp = 0;
 415     } else if (!strcmp(buf, "udp")) {
 416         is_udp = 1;
 417     } else {
 418         goto fail_syntax;
 419     }
 420
 421     if (get_str_sep(buf, sizeof(buf), &p, ':') < 0) {
 422         goto fail_syntax;
 423     }
 424     if (buf[0] != '\0' && !inet_aton(buf, &host_addr)) {
 425         goto fail_syntax;
 426     }
 427
 428     host_port = atoi(p);
 429
 430     err = slirp_remove_hostfwd(s->slirp, is_udp, host_addr, host_port);
 431
 432     monitor_printf(mon, "host forwarding rule for %s %s\n", src_str,
 433                    err ? "not found" : "removed");
 434     return;
 435
 436  fail_syntax:
 437     monitor_printf(mon, "invalid format\n");
 438 }
 439
 440 static int slirp_hostfwd(SlirpState *s, const char *redir_str,
 441                          int legacy_format)
 442 {
 443     struct in_addr host_addr = { .s_addr = INADDR_ANY };
 444     struct in_addr guest_addr = { .s_addr = 0 };
 445     int host_port, guest_port;
 446     const char *p;
 447     char buf[256];
 448     int is_udp;
 449     char *end;
 450
 451     p = redir_str;
 452     if (!p || get_str_sep(buf, sizeof(buf), &p, ':') < 0) {
 453         goto fail_syntax;
 454     }
 455     if (!strcmp(buf, "tcp") || buf[0] == '\0') {
 456         is_udp = 0;
 457     } else if (!strcmp(buf, "udp")) {
 458         is_udp = 1;
 459     } else {
 460         goto fail_syntax;
 461     }
 462
 463     if (!legacy_format) {
 464         if (get_str_sep(buf, sizeof(buf), &p, ':') < 0) {
 465             goto fail_syntax;
 466         }
 467         if (buf[0] != '\0' && !inet_aton(buf, &host_addr)) {
 468             goto fail_syntax;
 469         }
 470     }
 471
 472     if (get_str_sep(buf, sizeof(buf), &p, legacy_format ? ':' : '-') < 0) {
 473         goto fail_syntax;
 474     }
 475     host_port = strtol(buf, &end, 0);
 476     if (*end != '\0' || host_port < 1 || host_port > 65535) {
 477         goto fail_syntax;
 478     }
 479
 480     if (get_str_sep(buf, sizeof(buf), &p, ':') < 0) {
 481         goto fail_syntax;
 482     }
 483     if (buf[0] != '\0' && !inet_aton(buf, &guest_addr)) {
 484         goto fail_syntax;
 485     }
 486
 487     guest_port = strtol(p, &end, 0);
 488     if (*end != '\0' || guest_port < 1 || guest_port > 65535) {
 489         goto fail_syntax;
 490     }
 491
 492     if (slirp_add_hostfwd(s->slirp, is_udp, host_addr, host_port, guest_addr,
 493                           guest_port) < 0) {
 494         error_report("could not set up host forwarding rule '%s'",
 495                      redir_str);
 496         return -1;
 497     }
 498     return 0;
 499
 500  fail_syntax:
 501     error_report("invalid host forwarding rule '%s'", redir_str);
 502     return -1;
 503 }
 504
 505 void hmp_hostfwd_add(Monitor *mon, const QDict *qdict)
 506 {
 507     const char *redir_str;
 508     SlirpState *s;
 509     const char *arg1 = qdict_get_str(qdict, "arg1");
 510     const char *arg2 = qdict_get_try_str(qdict, "arg2");
 511     const char *arg3 = qdict_get_try_str(qdict, "arg3");
 512
 513     if (arg2) {
 514         s = slirp_lookup(mon, arg1, arg2);
 515         redir_str = arg3;
 516     } else {
 517         s = slirp_lookup(mon, NULL, NULL);
 518         redir_str = arg1;
 519     }
 520     if (s) {
 521         slirp_hostfwd(s, redir_str, 0);
 522     }
 523
 524 }
 525
 526 int net_slirp_redir(const char *redir_str)
 527 {
 528     struct slirp_config_str *config;
 529
 530     if (QTAILQ_EMPTY(&slirp_stacks)) {
 531         config = g_malloc(sizeof(*config));
 532         pstrcpy(config->str, sizeof(config->str), redir_str);
 533         config->flags = SLIRP_CFG_HOSTFWD | SLIRP_CFG_LEGACY;
 534         config->next = slirp_configs;
 535         slirp_configs = config;
 536         return 0;
 537     }
 538
 539     return slirp_hostfwd(QTAILQ_FIRST(&slirp_stacks), redir_str, 1);
 540 }
 541
 542 #ifndef _WIN32
 543
 544 /* automatic user mode samba server configuration */
 545 static void slirp_smb_cleanup(SlirpState *s)
 546 {
 547     char cmd[128];
 548     int ret;
 549
 550     if (s->smb_dir[0] != '\0') {
 551         snprintf(cmd, sizeof(cmd), "rm -rf %s", s->smb_dir);
 552         ret = system(cmd);
 553         if (ret == -1 || !WIFEXITED(ret)) {
 554             error_report("'%s' failed.", cmd);
 555         } else if (WEXITSTATUS(ret)) {
 556             error_report("'%s' failed. Error code: %d",
 557                          cmd, WEXITSTATUS(ret));
 558         }
 559         s->smb_dir[0] = '\0';
 560     }
 561 }
 562
 563 static int slirp_smb(SlirpState* s, const char *exported_dir,
 564                      struct in_addr vserver_addr)
 565 {
 566     char smb_conf[128];
 567     char smb_cmdline[128];
 568     struct passwd *passwd;
 569     FILE *f;
 570
 571     passwd = getpwuid(geteuid());
 572     if (!passwd) {
 573         error_report("failed to retrieve user name");
 574         return -1;
 575     }
 576
 577     if (access(CONFIG_SMBD_COMMAND, F_OK)) {
 578         error_report("could not find '%s', please install it",
 579                      CONFIG_SMBD_COMMAND);
 580         return -1;
 581     }
 582
 583     if (access(exported_dir, R_OK | X_OK)) {
 584         error_report("error accessing shared directory '%s': %s",
 585                      exported_dir, strerror(errno));
 586         return -1;
 587     }
 588
 589     snprintf(s->smb_dir, sizeof(s->smb_dir), "/tmp/qemu-smb.XXXXXX");
 590     if (!mkdtemp(s->smb_dir)) {
 591         error_report("could not create samba server dir '%s'", s->smb_dir);
 592         s->smb_dir[0] = 0;
 593         return -1;
 594     }
 595     snprintf(smb_conf, sizeof(smb_conf), "%s/%s", s->smb_dir, "smb.conf");
 596
 597     f = fopen(smb_conf, "w");
 598     if (!f) {
 599         slirp_smb_cleanup(s);
 600         error_report("could not create samba server configuration file '%s'",
 601                      smb_conf);
 602         return -1;
 603     }
 604     fprintf(f,
 605             "[global]\n"
 606             "private dir=%s\n"
 607             "interfaces=127.0.0.1\n"
 608             "bind interfaces only=yes\n"
 609             "pid directory=%s\n"
 610             "lock directory=%s\n"
 611             "state directory=%s\n"
 612             "cache directory=%s\n"
 613             "ncalrpc dir=%s/ncalrpc\n"
 614             "log file=%s/log.smbd\n"
 615             "smb passwd file=%s/smbpasswd\n"
 616             "security = user\n"
 617             "map to guest = Bad User\n"
 618             "load printers = no\n"
 619             "printing = bsd\n"
 620             "disable spoolss = yes\n"
 621             "usershare max shares = 0\n"
 622             "[qemu]\n"
 623             "path=%s\n"
 624             "read only=no\n"
 625             "guest ok=yes\n"
 626             "force user=%s\n",
 627             s->smb_dir,
 628             s->smb_dir,
 629             s->smb_dir,
 630             s->smb_dir,
 631             s->smb_dir,
 632             s->smb_dir,
 633             s->smb_dir,
 634             s->smb_dir,
 635             exported_dir,
 636             passwd->pw_name
 637             );
 638     fclose(f);
 639
 640     snprintf(smb_cmdline, sizeof(smb_cmdline), "%s -l %s -s %s",
 641              CONFIG_SMBD_COMMAND, s->smb_dir, smb_conf);
 642
 643     if (slirp_add_exec(s->slirp, 0, smb_cmdline, &vserver_addr, 139) < 0 ||
 644         slirp_add_exec(s->slirp, 0, smb_cmdline, &vserver_addr, 445) < 0) {
 645         slirp_smb_cleanup(s);
 646         error_report("conflicting/invalid smbserver address");
 647         return -1;
 648     }
 649     return 0;
 650 }
 651
 652 /* automatic user mode samba server configuration (legacy interface) */
 653 int net_slirp_smb(const char *exported_dir)
 654 {
 655     struct in_addr vserver_addr = { .s_addr = 0 };
 656
 657     if (legacy_smb_export) {
 658         fprintf(stderr, "-smb given twice\n");
 659         return -1;
 660     }
 661     legacy_smb_export = exported_dir;
 662     if (!QTAILQ_EMPTY(&slirp_stacks)) {
 663         return slirp_smb(QTAILQ_FIRST(&slirp_stacks), exported_dir,
 664                          vserver_addr);
 665     }
 666     return 0;
 667 }
 668
 669 #endif /* !defined(_WIN32) */
 670
 671 struct GuestFwd {
 672     CharDriverState *hd;
 673     struct in_addr server;
 674     int port;
 675     Slirp *slirp;
 676 };
 677
 678 static int guestfwd_can_read(void *opaque)
 679 {
 680     struct GuestFwd *fwd = opaque;
 681     return slirp_socket_can_recv(fwd->slirp, fwd->server, fwd->port);
 682 }
 683
 684 static void guestfwd_read(void *opaque, const uint8_t *buf, int size)
 685 {
 686     struct GuestFwd *fwd = opaque;
 687     slirp_socket_recv(fwd->slirp, fwd->server, fwd->port, buf, size);
 688 }
 689
 690 static int slirp_guestfwd(SlirpState *s, const char *config_str,
 691                           int legacy_format)
 692 {
 693     struct in_addr server = { .s_addr = 0 };
 694     struct GuestFwd *fwd;
 695     const char *p;
 696     char buf[128];
 697     char *end;
 698     int port;
 699
 700     p = config_str;
 701     if (legacy_format) {
 702         if (get_str_sep(buf, sizeof(buf), &p, ':') < 0) {
 703             goto fail_syntax;
 704         }
 705     } else {
 706         if (get_str_sep(buf, sizeof(buf), &p, ':') < 0) {
 707             goto fail_syntax;
 708         }
 709         if (strcmp(buf, "tcp") && buf[0] != '\0') {
 710             goto fail_syntax;
 711         }
 712         if (get_str_sep(buf, sizeof(buf), &p, ':') < 0) {
 713             goto fail_syntax;
 714         }
 715         if (buf[0] != '\0' && !inet_aton(buf, &server)) {
 716             goto fail_syntax;
 717         }
 718         if (get_str_sep(buf, sizeof(buf), &p, '-') < 0) {
 719             goto fail_syntax;
 720         }
 721     }
 722     port = strtol(buf, &end, 10);
 723     if (*end != '\0' || port < 1 || port > 65535) {
 724         goto fail_syntax;
 725     }
 726
 727     snprintf(buf, sizeof(buf), "guestfwd.tcp.%d", port);
 728
 729     if ((strlen(p) > 4) && !strncmp(p, "cmd:", 4)) {
 730         if (slirp_add_exec(s->slirp, 0, &p[4], &server, port) < 0) {
 731             error_report("conflicting/invalid host:port in guest forwarding "
 732                          "rule '%s'", config_str);
 733             return -1;
 734         }
 735     } else {
 736         fwd = g_new(struct GuestFwd, 1);
 737         fwd->hd = qemu_chr_new(buf, p, NULL);
 738         if (!fwd->hd) {
 739             error_report("could not open guest forwarding device '%s'", buf);
 740             g_free(fwd);
 741             return -1;
 742         }
 743
 744         if (slirp_add_exec(s->slirp, 3, fwd->hd, &server, port) < 0) {
 745             error_report("conflicting/invalid host:port in guest forwarding "
 746                          "rule '%s'", config_str);
 747             g_free(fwd);
 748             return -1;
 749         }
 750         fwd->server = server;
 751         fwd->port = port;
 752         fwd->slirp = s->slirp;
 753
 754         qemu_chr_fe_claim_no_fail(fwd->hd);
 755         qemu_chr_add_handlers(fwd->hd, guestfwd_can_read, guestfwd_read,
 756                               NULL, fwd);
 757     }
 758     return 0;
 759
 760  fail_syntax:
 761     error_report("invalid guest forwarding rule '%s'", config_str);
 762     return -1;
 763 }
 764
 765 void hmp_info_usernet(Monitor *mon, const QDict *qdict)
 766 {
 767     SlirpState *s;
 768
 769     QTAILQ_FOREACH(s, &slirp_stacks, entry) {
 770         int id;
 771         bool got_vlan_id = net_hub_id_for_client(&s->nc, &id) == 0;
 772         monitor_printf(mon, "VLAN %d (%s):\n",
 773                        got_vlan_id ? id : -1,
 774                        s->nc.name);
 775         slirp_connection_info(s->slirp, mon);
 776     }
 777 }
 778
 779 static void
 780 net_init_slirp_configs(const StringList *fwd, int flags)
 781 {
 782     while (fwd) {
 783         struct slirp_config_str *config;
 784
 785         config = g_malloc0(sizeof(*config));
 786         pstrcpy(config->str, sizeof(config->str), fwd->value->str);
 787         config->flags = flags;
 788         config->next = slirp_configs;
 789         slirp_configs = config;
 790
 791         fwd = fwd->next;
 792     }
 793 }
 794
 795 static const char **slirp_dnssearch(const StringList *dnsname)
 796 {
 797     const StringList *c = dnsname;
 798     size_t i = 0, num_opts = 0;
 799     const char **ret;
 800
 801     while (c) {
 802         num_opts++;
 803         c = c->next;
 804     }
 805
 806     if (num_opts == 0) {
 807         return NULL;
 808     }
 809
 810     ret = g_malloc((num_opts + 1) * sizeof(*ret));
 811     c = dnsname;
 812     while (c) {
 813         ret[i++] = c->value->str;
 814         c = c->next;
 815     }
 816     ret[i] = NULL;
 817     return ret;
 818 }
 819
 820 int net_init_slirp(const NetClientOptions *opts, const char *name,
 821                    NetClientState *peer, Error **errp)
 822 {
 823     /* FIXME error_setg(errp, ...) on failure */
 824     struct slirp_config_str *config;
 825     char *vnet;
 826     int ret;
 827     const NetdevUserOptions *user;
 828     const char **dnssearch;
 829     bool ipv4 = true, ipv6 = true;
 830
 831     assert(opts->type == NET_CLIENT_OPTIONS_KIND_USER);
 832     user = opts->u.user.data;
 833
 834     if ((user->has_ipv6 && user->ipv6 && !user->has_ipv4) ||
 835         (user->has_ipv4 && !user->ipv4)) {
 836         ipv4 = 0;
 837     }
 838     if ((user->has_ipv4 && user->ipv4 && !user->has_ipv6) ||
 839         (user->has_ipv6 && !user->ipv6)) {
 840         ipv6 = 0;
 841     }
 842
 843     vnet = user->has_net ? g_strdup(user->net) :
 844            user->has_ip  ? g_strdup_printf("%s/24", user->ip) :
 845            NULL;
 846
 847     dnssearch = slirp_dnssearch(user->dnssearch);
 848
 849     /* all optional fields are initialized to "all bits zero" */
 850
 851     net_init_slirp_configs(user->hostfwd, SLIRP_CFG_HOSTFWD);
 852     net_init_slirp_configs(user->guestfwd, 0);
 853
 854     ret = net_slirp_init(peer, "user", name, user->q_restrict,
 855                          ipv4, vnet, user->host,
 856                          ipv6, user->ipv6_prefix, user->ipv6_prefixlen,
 857                          user->ipv6_host, user->hostname, user->tftp,
 858                          user->bootfile, user->dhcpstart,
 859                          user->dns, user->ipv6_dns, user->smb,
 860                          user->smbserver, dnssearch);
 861
 862     while (slirp_configs) {
 863         config = slirp_configs;
 864         slirp_configs = config->next;
 865         g_free(config);
 866     }
 867
 868     g_free(vnet);
 869     g_free(dnssearch);
 870
 871     return ret;
 872 }
 873
 874 int net_slirp_parse_legacy(QemuOptsList *opts_list, const char *optarg, int *ret)
 875 {
 876     if (strcmp(opts_list->name, "net") != 0 ||
 877         strncmp(optarg, "channel,", strlen("channel,")) != 0) {
 878         return 0;
 879     }
 880
 881     error_report("The '-net channel' option is deprecated. "
 882                  "Please use '-netdev user,guestfwd=...' instead.");
 883
 884     /* handle legacy -net channel,port:chr */
 885     optarg += strlen("channel,");
 886
 887     if (QTAILQ_EMPTY(&slirp_stacks)) {
 888         struct slirp_config_str *config;
 889
 890         config = g_malloc(sizeof(*config));
 891         pstrcpy(config->str, sizeof(config->str), optarg);
 892         config->flags = SLIRP_CFG_LEGACY;
 893         config->next = slirp_configs;
 894         slirp_configs = config;
 895         *ret = 0;
 896     } else {
 897         *ret = slirp_guestfwd(QTAILQ_FIRST(&slirp_stacks), optarg, 1);
 898     }
 899
 900     return 1;
 901 }
 902