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 "net/slirp.h"
  25
  26 #include "config-host.h"
  27
  28 #include "net.h"
  29 #include "monitor.h"
  30 #include "sysemu.h"
  31 #include "qemu_socket.h"
  32 #include "slirp/libslirp.h"
  33
  34 static int get_str_sep(char *buf, int buf_size, const char **pp, int sep)
  35 {
  36     const char *p, *p1;
  37     int len;
  38     p = *pp;
  39     p1 = strchr(p, sep);
  40     if (!p1)
  41         return -1;
  42     len = p1 - p;
  43     p1++;
  44     if (buf_size > 0) {
  45         if (len > buf_size - 1)
  46             len = buf_size - 1;
  47         memcpy(buf, p, len);
  48         buf[len] = '\0';
  49     }
  50     *pp = p1;
  51     return 0;
  52 }
  53
  54 /* slirp network adapter */
  55
  56 #define SLIRP_CFG_HOSTFWD 1
  57 #define SLIRP_CFG_LEGACY  2
  58
  59 struct slirp_config_str {
  60     struct slirp_config_str *next;
  61     int flags;
  62     char str[1024];
  63     int legacy_format;
  64 };
  65
  66 typedef struct SlirpState {
  67     VLANClientState nc;
  68     QTAILQ_ENTRY(SlirpState) entry;
  69     Slirp *slirp;
  70 #ifndef _WIN32
  71     char smb_dir[128];
  72 #endif
  73 } SlirpState;
  74
  75 static struct slirp_config_str *slirp_configs;
  76 const char *legacy_tftp_prefix;
  77 const char *legacy_bootp_filename;
  78 static QTAILQ_HEAD(slirp_stacks, SlirpState) slirp_stacks =
  79     QTAILQ_HEAD_INITIALIZER(slirp_stacks);
  80
  81 static int slirp_hostfwd(SlirpState *s, const char *redir_str,
  82                          int legacy_format);
  83 static int slirp_guestfwd(SlirpState *s, const char *config_str,
  84                           int legacy_format);
  85
  86 #ifndef _WIN32
  87 static const char *legacy_smb_export;
  88
  89 static int slirp_smb(SlirpState *s, const char *exported_dir,
  90                      struct in_addr vserver_addr);
  91 static void slirp_smb_cleanup(SlirpState *s);
  92 #else
  93 static inline void slirp_smb_cleanup(SlirpState *s) { }
  94 #endif
  95
  96 int slirp_can_output(void *opaque)
  97 {
  98     SlirpState *s = opaque;
  99
 100     return qemu_can_send_packet(&s->nc);
 101 }
 102
 103 void 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(VLANClientState *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 net_slirp_cleanup(VLANClientState *nc)
 120 {
 121     SlirpState *s = DO_UPCAST(SlirpState, nc, nc);
 122
 123     slirp_cleanup(s->slirp);
 124     slirp_smb_cleanup(s);
 125     QTAILQ_REMOVE(&slirp_stacks, s, entry);
 126 }
 127
 128 static NetClientInfo net_slirp_info = {
 129     .type = NET_CLIENT_TYPE_SLIRP,
 130     .size = sizeof(SlirpState),
 131     .receive = net_slirp_receive,
 132     .cleanup = net_slirp_cleanup,
 133 };
 134
 135 static int net_slirp_init(VLANState *vlan, const char *model,
 136                           const char *name, int restricted,
 137                           const char *vnetwork, const char *vhost,
 138                           const char *vhostname, const char *tftp_export,
 139                           const char *bootfile, const char *vdhcp_start,
 140                           const char *vnameserver, const char *smb_export,
 141                           const char *vsmbserver)
 142 {
 143     /* default settings according to historic slirp */
 144     struct in_addr net  = { .s_addr = htonl(0x0a000200) }; /* 10.0.2.0 */
 145     struct in_addr mask = { .s_addr = htonl(0xffffff00) }; /* 255.255.255.0 */
 146     struct in_addr host = { .s_addr = htonl(0x0a000202) }; /* 10.0.2.2 */
 147     struct in_addr dhcp = { .s_addr = htonl(0x0a00020f) }; /* 10.0.2.15 */
 148     struct in_addr dns  = { .s_addr = htonl(0x0a000203) }; /* 10.0.2.3 */
 149 #ifndef _WIN32
 150     struct in_addr smbsrv = { .s_addr = 0 };
 151 #endif
 152     VLANClientState *nc;
 153     SlirpState *s;
 154     char buf[20];
 155     uint32_t addr;
 156     int shift;
 157     char *end;
 158     struct slirp_config_str *config;
 159
 160     if (!tftp_export) {
 161         tftp_export = legacy_tftp_prefix;
 162     }
 163     if (!bootfile) {
 164         bootfile = legacy_bootp_filename;
 165     }
 166
 167     if (vnetwork) {
 168         if (get_str_sep(buf, sizeof(buf), &vnetwork, '/') < 0) {
 169             if (!inet_aton(vnetwork, &net)) {
 170                 return -1;
 171             }
 172             addr = ntohl(net.s_addr);
 173             if (!(addr & 0x80000000)) {
 174                 mask.s_addr = htonl(0xff000000); /* class A */
 175             } else if ((addr & 0xfff00000) == 0xac100000) {
 176                 mask.s_addr = htonl(0xfff00000); /* priv. 172.16.0.0/12 */
 177             } else if ((addr & 0xc0000000) == 0x80000000) {
 178                 mask.s_addr = htonl(0xffff0000); /* class B */
 179             } else if ((addr & 0xffff0000) == 0xc0a80000) {
 180                 mask.s_addr = htonl(0xffff0000); /* priv. 192.168.0.0/16 */
 181             } else if ((addr & 0xffff0000) == 0xc6120000) {
 182                 mask.s_addr = htonl(0xfffe0000); /* tests 198.18.0.0/15 */
 183             } else if ((addr & 0xe0000000) == 0xe0000000) {
 184                 mask.s_addr = htonl(0xffffff00); /* class C */
 185             } else {
 186                 mask.s_addr = htonl(0xfffffff0); /* multicast/reserved */
 187             }
 188         } else {
 189             if (!inet_aton(buf, &net)) {
 190                 return -1;
 191             }
 192             shift = strtol(vnetwork, &end, 10);
 193             if (*end != '\0') {
 194                 if (!inet_aton(vnetwork, &mask)) {
 195                     return -1;
 196                 }
 197             } else if (shift < 4 || shift > 32) {
 198                 return -1;
 199             } else {
 200                 mask.s_addr = htonl(0xffffffff << (32 - shift));
 201             }
 202         }
 203         net.s_addr &= mask.s_addr;
 204         host.s_addr = net.s_addr | (htonl(0x0202) & ~mask.s_addr);
 205         dhcp.s_addr = net.s_addr | (htonl(0x020f) & ~mask.s_addr);
 206         dns.s_addr  = net.s_addr | (htonl(0x0203) & ~mask.s_addr);
 207     }
 208
 209     if (vhost && !inet_aton(vhost, &host)) {
 210         return -1;
 211     }
 212     if ((host.s_addr & mask.s_addr) != net.s_addr) {
 213         return -1;
 214     }
 215
 216     if (vdhcp_start && !inet_aton(vdhcp_start, &dhcp)) {
 217         return -1;
 218     }
 219     if ((dhcp.s_addr & mask.s_addr) != net.s_addr ||
 220         dhcp.s_addr == host.s_addr || dhcp.s_addr == dns.s_addr) {
 221         return -1;
 222     }
 223
 224     if (vnameserver && !inet_aton(vnameserver, &dns)) {
 225         return -1;
 226     }
 227     if ((dns.s_addr & mask.s_addr) != net.s_addr ||
 228         dns.s_addr == host.s_addr) {
 229         return -1;
 230     }
 231
 232 #ifndef _WIN32
 233     if (vsmbserver && !inet_aton(vsmbserver, &smbsrv)) {
 234         return -1;
 235     }
 236 #endif
 237
 238     nc = qemu_new_net_client(&net_slirp_info, vlan, NULL, model, name);
 239
 240     snprintf(nc->info_str, sizeof(nc->info_str),
 241              "net=%s, restricted=%c", inet_ntoa(net), restricted ? 'y' : 'n');
 242
 243     s = DO_UPCAST(SlirpState, nc, nc);
 244
 245     s->slirp = slirp_init(restricted, net, mask, host, vhostname,
 246                           tftp_export, bootfile, dhcp, dns, s);
 247     QTAILQ_INSERT_TAIL(&slirp_stacks, s, entry);
 248
 249     for (config = slirp_configs; config; config = config->next) {
 250         if (config->flags & SLIRP_CFG_HOSTFWD) {
 251             if (slirp_hostfwd(s, config->str,
 252                               config->flags & SLIRP_CFG_LEGACY) < 0)
 253                 goto error;
 254         } else {
 255             if (slirp_guestfwd(s, config->str,
 256                                config->flags & SLIRP_CFG_LEGACY) < 0)
 257                 goto error;
 258         }
 259     }
 260 #ifndef _WIN32
 261     if (!smb_export) {
 262         smb_export = legacy_smb_export;
 263     }
 264     if (smb_export) {
 265         if (slirp_smb(s, smb_export, smbsrv) < 0)
 266             goto error;
 267     }
 268 #endif
 269
 270     return 0;
 271
 272 error:
 273     qemu_del_vlan_client(nc);
 274     return -1;
 275 }
 276
 277 static SlirpState *slirp_lookup(Monitor *mon, const char *vlan,
 278                                 const char *stack)
 279 {
 280
 281     if (vlan) {
 282         VLANClientState *nc;
 283         nc = qemu_find_vlan_client_by_name(mon, strtol(vlan, NULL, 0), stack);
 284         if (!nc) {
 285             return NULL;
 286         }
 287         if (strcmp(nc->model, "user")) {
 288             monitor_printf(mon, "invalid device specified\n");
 289             return NULL;
 290         }
 291         return DO_UPCAST(SlirpState, nc, nc);
 292     } else {
 293         if (QTAILQ_EMPTY(&slirp_stacks)) {
 294             monitor_printf(mon, "user mode network stack not in use\n");
 295             return NULL;
 296         }
 297         return QTAILQ_FIRST(&slirp_stacks);
 298     }
 299 }
 300
 301 void net_slirp_hostfwd_remove(Monitor *mon, const QDict *qdict)
 302 {
 303     struct in_addr host_addr = { .s_addr = INADDR_ANY };
 304     int host_port;
 305     char buf[256] = "";
 306     const char *src_str, *p;
 307     SlirpState *s;
 308     int is_udp = 0;
 309     int err;
 310     const char *arg1 = qdict_get_str(qdict, "arg1");
 311     const char *arg2 = qdict_get_try_str(qdict, "arg2");
 312     const char *arg3 = qdict_get_try_str(qdict, "arg3");
 313
 314     if (arg2) {
 315         s = slirp_lookup(mon, arg1, arg2);
 316         src_str = arg3;
 317     } else {
 318         s = slirp_lookup(mon, NULL, NULL);
 319         src_str = arg1;
 320     }
 321     if (!s) {
 322         return;
 323     }
 324
 325     if (!src_str || !src_str[0])
 326         goto fail_syntax;
 327
 328     p = src_str;
 329     get_str_sep(buf, sizeof(buf), &p, ':');
 330
 331     if (!strcmp(buf, "tcp") || buf[0] == '\0') {
 332         is_udp = 0;
 333     } else if (!strcmp(buf, "udp")) {
 334         is_udp = 1;
 335     } else {
 336         goto fail_syntax;
 337     }
 338
 339     if (get_str_sep(buf, sizeof(buf), &p, ':') < 0) {
 340         goto fail_syntax;
 341     }
 342     if (buf[0] != '\0' && !inet_aton(buf, &host_addr)) {
 343         goto fail_syntax;
 344     }
 345
 346     host_port = atoi(p);
 347
 348     err = slirp_remove_hostfwd(QTAILQ_FIRST(&slirp_stacks)->slirp, is_udp,
 349                                host_addr, host_port);
 350
 351     monitor_printf(mon, "host forwarding rule for %s %s\n", src_str,
 352                    err ? "removed" : "not found");
 353     return;
 354
 355  fail_syntax:
 356     monitor_printf(mon, "invalid format\n");
 357 }
 358
 359 static int slirp_hostfwd(SlirpState *s, const char *redir_str,
 360                          int legacy_format)
 361 {
 362     struct in_addr host_addr = { .s_addr = INADDR_ANY };
 363     struct in_addr guest_addr = { .s_addr = 0 };
 364     int host_port, guest_port;
 365     const char *p;
 366     char buf[256];
 367     int is_udp;
 368     char *end;
 369
 370     p = redir_str;
 371     if (!p || get_str_sep(buf, sizeof(buf), &p, ':') < 0) {
 372         goto fail_syntax;
 373     }
 374     if (!strcmp(buf, "tcp") || buf[0] == '\0') {
 375         is_udp = 0;
 376     } else if (!strcmp(buf, "udp")) {
 377         is_udp = 1;
 378     } else {
 379         goto fail_syntax;
 380     }
 381
 382     if (!legacy_format) {
 383         if (get_str_sep(buf, sizeof(buf), &p, ':') < 0) {
 384             goto fail_syntax;
 385         }
 386         if (buf[0] != '\0' && !inet_aton(buf, &host_addr)) {
 387             goto fail_syntax;
 388         }
 389     }
 390
 391     if (get_str_sep(buf, sizeof(buf), &p, legacy_format ? ':' : '-') < 0) {
 392         goto fail_syntax;
 393     }
 394     host_port = strtol(buf, &end, 0);
 395     if (*end != '\0' || host_port < 1 || host_port > 65535) {
 396         goto fail_syntax;
 397     }
 398
 399     if (get_str_sep(buf, sizeof(buf), &p, ':') < 0) {
 400         goto fail_syntax;
 401     }
 402     if (buf[0] != '\0' && !inet_aton(buf, &guest_addr)) {
 403         goto fail_syntax;
 404     }
 405
 406     guest_port = strtol(p, &end, 0);
 407     if (*end != '\0' || guest_port < 1 || guest_port > 65535) {
 408         goto fail_syntax;
 409     }
 410
 411     if (slirp_add_hostfwd(s->slirp, is_udp, host_addr, host_port, guest_addr,
 412                           guest_port) < 0) {
 413         qemu_error("could not set up host forwarding rule '%s'\n",
 414                    redir_str);
 415         return -1;
 416     }
 417     return 0;
 418
 419  fail_syntax:
 420     qemu_error("invalid host forwarding rule '%s'\n", redir_str);
 421     return -1;
 422 }
 423
 424 void net_slirp_hostfwd_add(Monitor *mon, const QDict *qdict)
 425 {
 426     const char *redir_str;
 427     SlirpState *s;
 428     const char *arg1 = qdict_get_str(qdict, "arg1");
 429     const char *arg2 = qdict_get_try_str(qdict, "arg2");
 430     const char *arg3 = qdict_get_try_str(qdict, "arg3");
 431
 432     if (arg2) {
 433         s = slirp_lookup(mon, arg1, arg2);
 434         redir_str = arg3;
 435     } else {
 436         s = slirp_lookup(mon, NULL, NULL);
 437         redir_str = arg1;
 438     }
 439     if (s) {
 440         slirp_hostfwd(s, redir_str, 0);
 441     }
 442
 443 }
 444
 445 int net_slirp_redir(const char *redir_str)
 446 {
 447     struct slirp_config_str *config;
 448
 449     if (QTAILQ_EMPTY(&slirp_stacks)) {
 450         config = qemu_malloc(sizeof(*config));
 451         pstrcpy(config->str, sizeof(config->str), redir_str);
 452         config->flags = SLIRP_CFG_HOSTFWD | SLIRP_CFG_LEGACY;
 453         config->next = slirp_configs;
 454         slirp_configs = config;
 455         return 0;
 456     }
 457
 458     return slirp_hostfwd(QTAILQ_FIRST(&slirp_stacks), redir_str, 1);
 459 }
 460
 461 #ifndef _WIN32
 462
 463 /* automatic user mode samba server configuration */
 464 static void slirp_smb_cleanup(SlirpState *s)
 465 {
 466     char cmd[128];
 467
 468     if (s->smb_dir[0] != '\0') {
 469         snprintf(cmd, sizeof(cmd), "rm -rf %s", s->smb_dir);
 470         system(cmd);
 471         s->smb_dir[0] = '\0';
 472     }
 473 }
 474
 475 static int slirp_smb(SlirpState* s, const char *exported_dir,
 476                      struct in_addr vserver_addr)
 477 {
 478     static int instance;
 479     char smb_conf[128];
 480     char smb_cmdline[128];
 481     FILE *f;
 482
 483     snprintf(s->smb_dir, sizeof(s->smb_dir), "/tmp/qemu-smb.%ld-%d",
 484              (long)getpid(), instance++);
 485     if (mkdir(s->smb_dir, 0700) < 0) {
 486         qemu_error("could not create samba server dir '%s'\n", s->smb_dir);
 487         return -1;
 488     }
 489     snprintf(smb_conf, sizeof(smb_conf), "%s/%s", s->smb_dir, "smb.conf");
 490
 491     f = fopen(smb_conf, "w");
 492     if (!f) {
 493         slirp_smb_cleanup(s);
 494         qemu_error("could not create samba server configuration file '%s'\n",
 495                    smb_conf);
 496         return -1;
 497     }
 498     fprintf(f,
 499             "[global]\n"
 500             "private dir=%s\n"
 501             "smb ports=0\n"
 502             "socket address=127.0.0.1\n"
 503             "pid directory=%s\n"
 504             "lock directory=%s\n"
 505             "log file=%s/log.smbd\n"
 506             "smb passwd file=%s/smbpasswd\n"
 507             "security = share\n"
 508             "[qemu]\n"
 509             "path=%s\n"
 510             "read only=no\n"
 511             "guest ok=yes\n",
 512             s->smb_dir,
 513             s->smb_dir,
 514             s->smb_dir,
 515             s->smb_dir,
 516             s->smb_dir,
 517             exported_dir
 518             );
 519     fclose(f);
 520
 521     snprintf(smb_cmdline, sizeof(smb_cmdline), "%s -s %s",
 522              SMBD_COMMAND, smb_conf);
 523
 524     if (slirp_add_exec(s->slirp, 0, smb_cmdline, &vserver_addr, 139) < 0) {
 525         slirp_smb_cleanup(s);
 526         qemu_error("conflicting/invalid smbserver address\n");
 527         return -1;
 528     }
 529     return 0;
 530 }
 531
 532 /* automatic user mode samba server configuration (legacy interface) */
 533 int net_slirp_smb(const char *exported_dir)
 534 {
 535     struct in_addr vserver_addr = { .s_addr = 0 };
 536
 537     if (legacy_smb_export) {
 538         fprintf(stderr, "-smb given twice\n");
 539         return -1;
 540     }
 541     legacy_smb_export = exported_dir;
 542     if (!QTAILQ_EMPTY(&slirp_stacks)) {
 543         return slirp_smb(QTAILQ_FIRST(&slirp_stacks), exported_dir,
 544                          vserver_addr);
 545     }
 546     return 0;
 547 }
 548
 549 #endif /* !defined(_WIN32) */
 550
 551 struct GuestFwd {
 552     CharDriverState *hd;
 553     struct in_addr server;
 554     int port;
 555     Slirp *slirp;
 556 };
 557
 558 static int guestfwd_can_read(void *opaque)
 559 {
 560     struct GuestFwd *fwd = opaque;
 561     return slirp_socket_can_recv(fwd->slirp, fwd->server, fwd->port);
 562 }
 563
 564 static void guestfwd_read(void *opaque, const uint8_t *buf, int size)
 565 {
 566     struct GuestFwd *fwd = opaque;
 567     slirp_socket_recv(fwd->slirp, fwd->server, fwd->port, buf, size);
 568 }
 569
 570 static int slirp_guestfwd(SlirpState *s, const char *config_str,
 571                           int legacy_format)
 572 {
 573     struct in_addr server = { .s_addr = 0 };
 574     struct GuestFwd *fwd;
 575     const char *p;
 576     char buf[128];
 577     char *end;
 578     int port;
 579
 580     p = config_str;
 581     if (legacy_format) {
 582         if (get_str_sep(buf, sizeof(buf), &p, ':') < 0) {
 583             goto fail_syntax;
 584         }
 585     } else {
 586         if (get_str_sep(buf, sizeof(buf), &p, ':') < 0) {
 587             goto fail_syntax;
 588         }
 589         if (strcmp(buf, "tcp") && buf[0] != '\0') {
 590             goto fail_syntax;
 591         }
 592         if (get_str_sep(buf, sizeof(buf), &p, ':') < 0) {
 593             goto fail_syntax;
 594         }
 595         if (buf[0] != '\0' && !inet_aton(buf, &server)) {
 596             goto fail_syntax;
 597         }
 598         if (get_str_sep(buf, sizeof(buf), &p, '-') < 0) {
 599             goto fail_syntax;
 600         }
 601     }
 602     port = strtol(buf, &end, 10);
 603     if (*end != '\0' || port < 1 || port > 65535) {
 604         goto fail_syntax;
 605     }
 606
 607     fwd = qemu_malloc(sizeof(struct GuestFwd));
 608     snprintf(buf, sizeof(buf), "guestfwd.tcp:%d", port);
 609     fwd->hd = qemu_chr_open(buf, p, NULL);
 610     if (!fwd->hd) {
 611         qemu_error("could not open guest forwarding device '%s'\n", buf);
 612         qemu_free(fwd);
 613         return -1;
 614     }
 615
 616     if (slirp_add_exec(s->slirp, 3, fwd->hd, &server, port) < 0) {
 617         qemu_error("conflicting/invalid host:port in guest forwarding "
 618                    "rule '%s'\n", config_str);
 619         qemu_free(fwd);
 620         return -1;
 621     }
 622     fwd->server = server;
 623     fwd->port = port;
 624     fwd->slirp = s->slirp;
 625
 626     qemu_chr_add_handlers(fwd->hd, guestfwd_can_read, guestfwd_read,
 627                           NULL, fwd);
 628     return 0;
 629
 630  fail_syntax:
 631     qemu_error("invalid guest forwarding rule '%s'\n", config_str);
 632     return -1;
 633 }
 634
 635 void do_info_usernet(Monitor *mon)
 636 {
 637     SlirpState *s;
 638
 639     QTAILQ_FOREACH(s, &slirp_stacks, entry) {
 640         monitor_printf(mon, "VLAN %d (%s):\n",
 641                        s->nc.vlan ? s->nc.vlan->id : -1,
 642                        s->nc.name);
 643         slirp_connection_info(s->slirp, mon);
 644     }
 645 }
 646
 647 static int net_init_slirp_configs(const char *name, const char *value, void *opaque)
 648 {
 649     struct slirp_config_str *config;
 650
 651     if (strcmp(name, "hostfwd") != 0 && strcmp(name, "guestfwd") != 0) {
 652         return 0;
 653     }
 654
 655     config = qemu_mallocz(sizeof(*config));
 656
 657     pstrcpy(config->str, sizeof(config->str), value);
 658
 659     if (!strcmp(name, "hostfwd")) {
 660         config->flags = SLIRP_CFG_HOSTFWD;
 661     }
 662
 663     config->next = slirp_configs;
 664     slirp_configs = config;
 665
 666     return 0;
 667 }
 668
 669 int net_init_slirp(QemuOpts *opts,
 670                    Monitor *mon,
 671                    const char *name,
 672                    VLANState *vlan)
 673 {
 674     struct slirp_config_str *config;
 675     const char *vhost;
 676     const char *vhostname;
 677     const char *vdhcp_start;
 678     const char *vnamesrv;
 679     const char *tftp_export;
 680     const char *bootfile;
 681     const char *smb_export;
 682     const char *vsmbsrv;
 683     char *vnet = NULL;
 684     int restricted = 0;
 685     int ret;
 686
 687     vhost       = qemu_opt_get(opts, "host");
 688     vhostname   = qemu_opt_get(opts, "hostname");
 689     vdhcp_start = qemu_opt_get(opts, "dhcpstart");
 690     vnamesrv    = qemu_opt_get(opts, "dns");
 691     tftp_export = qemu_opt_get(opts, "tftp");
 692     bootfile    = qemu_opt_get(opts, "bootfile");
 693     smb_export  = qemu_opt_get(opts, "smb");
 694     vsmbsrv     = qemu_opt_get(opts, "smbserver");
 695
 696     if (qemu_opt_get(opts, "ip")) {
 697         const char *ip = qemu_opt_get(opts, "ip");
 698         int l = strlen(ip) + strlen("/24") + 1;
 699
 700         vnet = qemu_malloc(l);
 701
 702         /* emulate legacy ip= parameter */
 703         pstrcpy(vnet, l, ip);
 704         pstrcat(vnet, l, "/24");
 705     }
 706
 707     if (qemu_opt_get(opts, "net")) {
 708         if (vnet) {
 709             qemu_free(vnet);
 710         }
 711         vnet = qemu_strdup(qemu_opt_get(opts, "net"));
 712     }
 713
 714     if (qemu_opt_get(opts, "restrict") &&
 715         qemu_opt_get(opts, "restrict")[0] == 'y') {
 716         restricted = 1;
 717     }
 718
 719     qemu_opt_foreach(opts, net_init_slirp_configs, NULL, 0);
 720
 721     ret = net_slirp_init(vlan, "user", name, restricted, vnet, vhost,
 722                          vhostname, tftp_export, bootfile, vdhcp_start,
 723                          vnamesrv, smb_export, vsmbsrv);
 724
 725     while (slirp_configs) {
 726         config = slirp_configs;
 727         slirp_configs = config->next;
 728         qemu_free(config);
 729     }
 730
 731     if (ret != -1 && vlan) {
 732         vlan->nb_host_devs++;
 733     }
 734
 735     qemu_free(vnet);
 736
 737     return ret;
 738 }
 739
 740 int net_slirp_parse_legacy(QemuOptsList *opts_list, const char *optarg, int *ret)
 741 {
 742     if (strcmp(opts_list->name, "net") != 0 ||
 743         strncmp(optarg, "channel,", strlen("channel,")) != 0) {
 744         return 0;
 745     }
 746
 747     /* handle legacy -net channel,port:chr */
 748     optarg += strlen("channel,");
 749
 750     if (QTAILQ_EMPTY(&slirp_stacks)) {
 751         struct slirp_config_str *config;
 752
 753         config = qemu_malloc(sizeof(*config));
 754         pstrcpy(config->str, sizeof(config->str), optarg);
 755         config->flags = SLIRP_CFG_LEGACY;
 756         config->next = slirp_configs;
 757         slirp_configs = config;
 758         *ret = 0;
 759     } else {
 760         *ret = slirp_guestfwd(QTAILQ_FIRST(&slirp_stacks), optarg, 1);
 761     }
 762
 763     return 1;
 764 }
 765