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 #ifndef _WIN32
  29 #include <sys/wait.h>
  30 #endif
  31 #include "net.h"
  32 #include "monitor.h"
  33 #include "qemu_socket.h"
  34 #include "slirp/libslirp.h"
  35
  36 static int get_str_sep(char *buf, int buf_size, const char **pp, int sep)
  37 {
  38     const char *p, *p1;
  39     int len;
  40     p = *pp;
  41     p1 = strchr(p, sep);
  42     if (!p1)
  43         return -1;
  44     len = p1 - p;
  45     p1++;
  46     if (buf_size > 0) {
  47         if (len > buf_size - 1)
  48             len = buf_size - 1;
  49         memcpy(buf, p, len);
  50         buf[len] = '\0';
  51     }
  52     *pp = p1;
  53     return 0;
  54 }
  55
  56 /* slirp network adapter */
  57
  58 #define SLIRP_CFG_HOSTFWD 1
  59 #define SLIRP_CFG_LEGACY  2
  60
  61 struct slirp_config_str {
  62     struct slirp_config_str *next;
  63     int flags;
  64     char str[1024];
  65     int legacy_format;
  66 };
  67
  68 typedef struct SlirpState {
  69     VLANClientState nc;
  70     QTAILQ_ENTRY(SlirpState) entry;
  71     Slirp *slirp;
  72 #ifndef _WIN32
  73     char smb_dir[128];
  74 #endif
  75 } SlirpState;
  76
  77 static struct slirp_config_str *slirp_configs;
  78 const char *legacy_tftp_prefix;
  79 const char *legacy_bootp_filename;
  80 static QTAILQ_HEAD(slirp_stacks, SlirpState) slirp_stacks =
  81     QTAILQ_HEAD_INITIALIZER(slirp_stacks);
  82
  83 static int slirp_hostfwd(SlirpState *s, const char *redir_str,
  84                          int legacy_format);
  85 static int slirp_guestfwd(SlirpState *s, const char *config_str,
  86                           int legacy_format);
  87
  88 #ifndef _WIN32
  89 static const char *legacy_smb_export;
  90
  91 static int slirp_smb(SlirpState *s, const char *exported_dir,
  92                      struct in_addr vserver_addr);
  93 static void slirp_smb_cleanup(SlirpState *s);
  94 #else
  95 static inline void slirp_smb_cleanup(SlirpState *s) { }
  96 #endif
  97
  98 int slirp_can_output(void *opaque)
  99 {
 100     SlirpState *s = opaque;
 101
 102     return qemu_can_send_packet(&s->nc);
 103 }
 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(VLANClientState *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(VLANClientState *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_TYPE_USER,
 132     .size = sizeof(SlirpState),
 133     .receive = net_slirp_receive,
 134     .cleanup = net_slirp_cleanup,
 135 };
 136
 137 static int net_slirp_init(VLANState *vlan, const char *model,
 138                           const char *name, int restricted,
 139                           const char *vnetwork, const char *vhost,
 140                           const char *vhostname, const char *tftp_export,
 141                           const char *bootfile, const char *vdhcp_start,
 142                           const char *vnameserver, const char *smb_export,
 143                           const char *vsmbserver)
 144 {
 145     /* default settings according to historic slirp */
 146     struct in_addr net  = { .s_addr = htonl(0x0a000200) }; /* 10.0.2.0 */
 147     struct in_addr mask = { .s_addr = htonl(0xffffff00) }; /* 255.255.255.0 */
 148     struct in_addr host = { .s_addr = htonl(0x0a000202) }; /* 10.0.2.2 */
 149     struct in_addr dhcp = { .s_addr = htonl(0x0a00020f) }; /* 10.0.2.15 */
 150     struct in_addr dns  = { .s_addr = htonl(0x0a000203) }; /* 10.0.2.3 */
 151 #ifndef _WIN32
 152     struct in_addr smbsrv = { .s_addr = 0 };
 153 #endif
 154     VLANClientState *nc;
 155     SlirpState *s;
 156     char buf[20];
 157     uint32_t addr;
 158     int shift;
 159     char *end;
 160     struct slirp_config_str *config;
 161
 162     if (!tftp_export) {
 163         tftp_export = legacy_tftp_prefix;
 164     }
 165     if (!bootfile) {
 166         bootfile = legacy_bootp_filename;
 167     }
 168
 169     if (vnetwork) {
 170         if (get_str_sep(buf, sizeof(buf), &vnetwork, '/') < 0) {
 171             if (!inet_aton(vnetwork, &net)) {
 172                 return -1;
 173             }
 174             addr = ntohl(net.s_addr);
 175             if (!(addr & 0x80000000)) {
 176                 mask.s_addr = htonl(0xff000000); /* class A */
 177             } else if ((addr & 0xfff00000) == 0xac100000) {
 178                 mask.s_addr = htonl(0xfff00000); /* priv. 172.16.0.0/12 */
 179             } else if ((addr & 0xc0000000) == 0x80000000) {
 180                 mask.s_addr = htonl(0xffff0000); /* class B */
 181             } else if ((addr & 0xffff0000) == 0xc0a80000) {
 182                 mask.s_addr = htonl(0xffff0000); /* priv. 192.168.0.0/16 */
 183             } else if ((addr & 0xffff0000) == 0xc6120000) {
 184                 mask.s_addr = htonl(0xfffe0000); /* tests 198.18.0.0/15 */
 185             } else if ((addr & 0xe0000000) == 0xe0000000) {
 186                 mask.s_addr = htonl(0xffffff00); /* class C */
 187             } else {
 188                 mask.s_addr = htonl(0xfffffff0); /* multicast/reserved */
 189             }
 190         } else {
 191             if (!inet_aton(buf, &net)) {
 192                 return -1;
 193             }
 194             shift = strtol(vnetwork, &end, 10);
 195             if (*end != '\0') {
 196                 if (!inet_aton(vnetwork, &mask)) {
 197                     return -1;
 198                 }
 199             } else if (shift < 4 || shift > 32) {
 200                 return -1;
 201             } else {
 202                 mask.s_addr = htonl(0xffffffff << (32 - shift));
 203             }
 204         }
 205         net.s_addr &= mask.s_addr;
 206         host.s_addr = net.s_addr | (htonl(0x0202) & ~mask.s_addr);
 207         dhcp.s_addr = net.s_addr | (htonl(0x020f) & ~mask.s_addr);
 208         dns.s_addr  = net.s_addr | (htonl(0x0203) & ~mask.s_addr);
 209     }
 210
 211     if (vhost && !inet_aton(vhost, &host)) {
 212         return -1;
 213     }
 214     if ((host.s_addr & mask.s_addr) != net.s_addr) {
 215         return -1;
 216     }
 217
 218     if (vdhcp_start && !inet_aton(vdhcp_start, &dhcp)) {
 219         return -1;
 220     }
 221     if ((dhcp.s_addr & mask.s_addr) != net.s_addr ||
 222         dhcp.s_addr == host.s_addr || dhcp.s_addr == dns.s_addr) {
 223         return -1;
 224     }
 225
 226     if (vnameserver && !inet_aton(vnameserver, &dns)) {
 227         return -1;
 228     }
 229     if ((dns.s_addr & mask.s_addr) != net.s_addr ||
 230         dns.s_addr == host.s_addr) {
 231         return -1;
 232     }
 233
 234 #ifndef _WIN32
 235     if (vsmbserver && !inet_aton(vsmbserver, &smbsrv)) {
 236         return -1;
 237     }
 238 #endif
 239
 240     nc = qemu_new_net_client(&net_slirp_info, vlan, NULL, model, name);
 241
 242     snprintf(nc->info_str, sizeof(nc->info_str),
 243              "net=%s,restrict=%s", inet_ntoa(net),
 244              restricted ? "on" : "off");
 245
 246     s = DO_UPCAST(SlirpState, nc, nc);
 247
 248     s->slirp = slirp_init(restricted, net, mask, host, vhostname,
 249                           tftp_export, bootfile, dhcp, dns, s);
 250     QTAILQ_INSERT_TAIL(&slirp_stacks, s, entry);
 251
 252     for (config = slirp_configs; config; config = config->next) {
 253         if (config->flags & SLIRP_CFG_HOSTFWD) {
 254             if (slirp_hostfwd(s, config->str,
 255                               config->flags & SLIRP_CFG_LEGACY) < 0)
 256                 goto error;
 257         } else {
 258             if (slirp_guestfwd(s, config->str,
 259                                config->flags & SLIRP_CFG_LEGACY) < 0)
 260                 goto error;
 261         }
 262     }
 263 #ifndef _WIN32
 264     if (!smb_export) {
 265         smb_export = legacy_smb_export;
 266     }
 267     if (smb_export) {
 268         if (slirp_smb(s, smb_export, smbsrv) < 0)
 269             goto error;
 270     }
 271 #endif
 272
 273     return 0;
 274
 275 error:
 276     qemu_del_vlan_client(nc);
 277     return -1;
 278 }
 279
 280 static SlirpState *slirp_lookup(Monitor *mon, const char *vlan,
 281                                 const char *stack)
 282 {
 283
 284     if (vlan) {
 285         VLANClientState *nc;
 286         nc = qemu_find_vlan_client_by_name(mon, strtol(vlan, NULL, 0), stack);
 287         if (!nc) {
 288             return NULL;
 289         }
 290         if (strcmp(nc->model, "user")) {
 291             monitor_printf(mon, "invalid device specified\n");
 292             return NULL;
 293         }
 294         return DO_UPCAST(SlirpState, nc, nc);
 295     } else {
 296         if (QTAILQ_EMPTY(&slirp_stacks)) {
 297             monitor_printf(mon, "user mode network stack not in use\n");
 298             return NULL;
 299         }
 300         return QTAILQ_FIRST(&slirp_stacks);
 301     }
 302 }
 303
 304 void net_slirp_hostfwd_remove(Monitor *mon, const QDict *qdict)
 305 {
 306     struct in_addr host_addr = { .s_addr = INADDR_ANY };
 307     int host_port;
 308     char buf[256];
 309     const char *src_str, *p;
 310     SlirpState *s;
 311     int is_udp = 0;
 312     int err;
 313     const char *arg1 = qdict_get_str(qdict, "arg1");
 314     const char *arg2 = qdict_get_try_str(qdict, "arg2");
 315     const char *arg3 = qdict_get_try_str(qdict, "arg3");
 316
 317     if (arg2) {
 318         s = slirp_lookup(mon, arg1, arg2);
 319         src_str = arg3;
 320     } else {
 321         s = slirp_lookup(mon, NULL, NULL);
 322         src_str = arg1;
 323     }
 324     if (!s) {
 325         return;
 326     }
 327
 328     p = src_str;
 329     if (!p || get_str_sep(buf, sizeof(buf), &p, ':') < 0) {
 330         goto fail_syntax;
 331     }
 332
 333     if (!strcmp(buf, "tcp") || buf[0] == '\0') {
 334         is_udp = 0;
 335     } else if (!strcmp(buf, "udp")) {
 336         is_udp = 1;
 337     } else {
 338         goto fail_syntax;
 339     }
 340
 341     if (get_str_sep(buf, sizeof(buf), &p, ':') < 0) {
 342         goto fail_syntax;
 343     }
 344     if (buf[0] != '\0' && !inet_aton(buf, &host_addr)) {
 345         goto fail_syntax;
 346     }
 347
 348     host_port = atoi(p);
 349
 350     err = slirp_remove_hostfwd(QTAILQ_FIRST(&slirp_stacks)->slirp, is_udp,
 351                                host_addr, host_port);
 352
 353     monitor_printf(mon, "host forwarding rule for %s %s\n", src_str,
 354                    err ? "not found" : "removed");
 355     return;
 356
 357  fail_syntax:
 358     monitor_printf(mon, "invalid format\n");
 359 }
 360
 361 static int slirp_hostfwd(SlirpState *s, const char *redir_str,
 362                          int legacy_format)
 363 {
 364     struct in_addr host_addr = { .s_addr = INADDR_ANY };
 365     struct in_addr guest_addr = { .s_addr = 0 };
 366     int host_port, guest_port;
 367     const char *p;
 368     char buf[256];
 369     int is_udp;
 370     char *end;
 371
 372     p = redir_str;
 373     if (!p || get_str_sep(buf, sizeof(buf), &p, ':') < 0) {
 374         goto fail_syntax;
 375     }
 376     if (!strcmp(buf, "tcp") || buf[0] == '\0') {
 377         is_udp = 0;
 378     } else if (!strcmp(buf, "udp")) {
 379         is_udp = 1;
 380     } else {
 381         goto fail_syntax;
 382     }
 383
 384     if (!legacy_format) {
 385         if (get_str_sep(buf, sizeof(buf), &p, ':') < 0) {
 386             goto fail_syntax;
 387         }
 388         if (buf[0] != '\0' && !inet_aton(buf, &host_addr)) {
 389             goto fail_syntax;
 390         }
 391     }
 392
 393     if (get_str_sep(buf, sizeof(buf), &p, legacy_format ? ':' : '-') < 0) {
 394         goto fail_syntax;
 395     }
 396     host_port = strtol(buf, &end, 0);
 397     if (*end != '\0' || host_port < 1 || host_port > 65535) {
 398         goto fail_syntax;
 399     }
 400
 401     if (get_str_sep(buf, sizeof(buf), &p, ':') < 0) {
 402         goto fail_syntax;
 403     }
 404     if (buf[0] != '\0' && !inet_aton(buf, &guest_addr)) {
 405         goto fail_syntax;
 406     }
 407
 408     guest_port = strtol(p, &end, 0);
 409     if (*end != '\0' || guest_port < 1 || guest_port > 65535) {
 410         goto fail_syntax;
 411     }
 412
 413     if (slirp_add_hostfwd(s->slirp, is_udp, host_addr, host_port, guest_addr,
 414                           guest_port) < 0) {
 415         error_report("could not set up host forwarding rule '%s'",
 416                      redir_str);
 417         return -1;
 418     }
 419     return 0;
 420
 421  fail_syntax:
 422     error_report("invalid host forwarding rule '%s'", redir_str);
 423     return -1;
 424 }
 425
 426 void net_slirp_hostfwd_add(Monitor *mon, const QDict *qdict)
 427 {
 428     const char *redir_str;
 429     SlirpState *s;
 430     const char *arg1 = qdict_get_str(qdict, "arg1");
 431     const char *arg2 = qdict_get_try_str(qdict, "arg2");
 432     const char *arg3 = qdict_get_try_str(qdict, "arg3");
 433
 434     if (arg2) {
 435         s = slirp_lookup(mon, arg1, arg2);
 436         redir_str = arg3;
 437     } else {
 438         s = slirp_lookup(mon, NULL, NULL);
 439         redir_str = arg1;
 440     }
 441     if (s) {
 442         slirp_hostfwd(s, redir_str, 0);
 443     }
 444
 445 }
 446
 447 int net_slirp_redir(const char *redir_str)
 448 {
 449     struct slirp_config_str *config;
 450
 451     if (QTAILQ_EMPTY(&slirp_stacks)) {
 452         config = g_malloc(sizeof(*config));
 453         pstrcpy(config->str, sizeof(config->str), redir_str);
 454         config->flags = SLIRP_CFG_HOSTFWD | SLIRP_CFG_LEGACY;
 455         config->next = slirp_configs;
 456         slirp_configs = config;
 457         return 0;
 458     }
 459
 460     return slirp_hostfwd(QTAILQ_FIRST(&slirp_stacks), redir_str, 1);
 461 }
 462
 463 #ifndef _WIN32
 464
 465 /* automatic user mode samba server configuration */
 466 static void slirp_smb_cleanup(SlirpState *s)
 467 {
 468     char cmd[128];
 469     int ret;
 470
 471     if (s->smb_dir[0] != '\0') {
 472         snprintf(cmd, sizeof(cmd), "rm -rf %s", s->smb_dir);
 473         ret = system(cmd);
 474         if (ret == -1 || !WIFEXITED(ret)) {
 475             error_report("'%s' failed.", cmd);
 476         } else if (WEXITSTATUS(ret)) {
 477             error_report("'%s' failed. Error code: %d",
 478                          cmd, WEXITSTATUS(ret));
 479         }
 480         s->smb_dir[0] = '\0';
 481     }
 482 }
 483
 484 static int slirp_smb(SlirpState* s, const char *exported_dir,
 485                      struct in_addr vserver_addr)
 486 {
 487     static int instance;
 488     char smb_conf[128];
 489     char smb_cmdline[128];
 490     FILE *f;
 491
 492     snprintf(s->smb_dir, sizeof(s->smb_dir), "/tmp/qemu-smb.%ld-%d",
 493              (long)getpid(), instance++);
 494     if (mkdir(s->smb_dir, 0700) < 0) {
 495         error_report("could not create samba server dir '%s'", s->smb_dir);
 496         return -1;
 497     }
 498     snprintf(smb_conf, sizeof(smb_conf), "%s/%s", s->smb_dir, "smb.conf");
 499
 500     f = fopen(smb_conf, "w");
 501     if (!f) {
 502         slirp_smb_cleanup(s);
 503         error_report("could not create samba server configuration file '%s'",
 504                      smb_conf);
 505         return -1;
 506     }
 507     fprintf(f,
 508             "[global]\n"
 509             "private dir=%s\n"
 510             "smb ports=0\n"
 511             "socket address=127.0.0.1\n"
 512             "pid directory=%s\n"
 513             "lock directory=%s\n"
 514             "log file=%s/log.smbd\n"
 515             "smb passwd file=%s/smbpasswd\n"
 516             "security = share\n"
 517             "[qemu]\n"
 518             "path=%s\n"
 519             "read only=no\n"
 520             "guest ok=yes\n",
 521             s->smb_dir,
 522             s->smb_dir,
 523             s->smb_dir,
 524             s->smb_dir,
 525             s->smb_dir,
 526             exported_dir
 527             );
 528     fclose(f);
 529
 530     snprintf(smb_cmdline, sizeof(smb_cmdline), "%s -s %s",
 531              CONFIG_SMBD_COMMAND, smb_conf);
 532
 533     if (slirp_add_exec(s->slirp, 0, smb_cmdline, &vserver_addr, 139) < 0) {
 534         slirp_smb_cleanup(s);
 535         error_report("conflicting/invalid smbserver address");
 536         return -1;
 537     }
 538     return 0;
 539 }
 540
 541 /* automatic user mode samba server configuration (legacy interface) */
 542 int net_slirp_smb(const char *exported_dir)
 543 {
 544     struct in_addr vserver_addr = { .s_addr = 0 };
 545
 546     if (legacy_smb_export) {
 547         fprintf(stderr, "-smb given twice\n");
 548         return -1;
 549     }
 550     legacy_smb_export = exported_dir;
 551     if (!QTAILQ_EMPTY(&slirp_stacks)) {
 552         return slirp_smb(QTAILQ_FIRST(&slirp_stacks), exported_dir,
 553                          vserver_addr);
 554     }
 555     return 0;
 556 }
 557
 558 #endif /* !defined(_WIN32) */
 559
 560 struct GuestFwd {
 561     CharDriverState *hd;
 562     struct in_addr server;
 563     int port;
 564     Slirp *slirp;
 565 };
 566
 567 static int guestfwd_can_read(void *opaque)
 568 {
 569     struct GuestFwd *fwd = opaque;
 570     return slirp_socket_can_recv(fwd->slirp, fwd->server, fwd->port);
 571 }
 572
 573 static void guestfwd_read(void *opaque, const uint8_t *buf, int size)
 574 {
 575     struct GuestFwd *fwd = opaque;
 576     slirp_socket_recv(fwd->slirp, fwd->server, fwd->port, buf, size);
 577 }
 578
 579 static int slirp_guestfwd(SlirpState *s, const char *config_str,
 580                           int legacy_format)
 581 {
 582     struct in_addr server = { .s_addr = 0 };
 583     struct GuestFwd *fwd;
 584     const char *p;
 585     char buf[128];
 586     char *end;
 587     int port;
 588
 589     p = config_str;
 590     if (legacy_format) {
 591         if (get_str_sep(buf, sizeof(buf), &p, ':') < 0) {
 592             goto fail_syntax;
 593         }
 594     } else {
 595         if (get_str_sep(buf, sizeof(buf), &p, ':') < 0) {
 596             goto fail_syntax;
 597         }
 598         if (strcmp(buf, "tcp") && buf[0] != '\0') {
 599             goto fail_syntax;
 600         }
 601         if (get_str_sep(buf, sizeof(buf), &p, ':') < 0) {
 602             goto fail_syntax;
 603         }
 604         if (buf[0] != '\0' && !inet_aton(buf, &server)) {
 605             goto fail_syntax;
 606         }
 607         if (get_str_sep(buf, sizeof(buf), &p, '-') < 0) {
 608             goto fail_syntax;
 609         }
 610     }
 611     port = strtol(buf, &end, 10);
 612     if (*end != '\0' || port < 1 || port > 65535) {
 613         goto fail_syntax;
 614     }
 615
 616     fwd = g_malloc(sizeof(struct GuestFwd));
 617     snprintf(buf, sizeof(buf), "guestfwd.tcp.%d", port);
 618     fwd->hd = qemu_chr_new(buf, p, NULL);
 619     if (!fwd->hd) {
 620         error_report("could not open guest forwarding device '%s'", buf);
 621         g_free(fwd);
 622         return -1;
 623     }
 624
 625     if (slirp_add_exec(s->slirp, 3, fwd->hd, &server, port) < 0) {
 626         error_report("conflicting/invalid host:port in guest forwarding "
 627                      "rule '%s'", config_str);
 628         g_free(fwd);
 629         return -1;
 630     }
 631     fwd->server = server;
 632     fwd->port = port;
 633     fwd->slirp = s->slirp;
 634
 635     qemu_chr_add_handlers(fwd->hd, guestfwd_can_read, guestfwd_read,
 636                           NULL, fwd);
 637     return 0;
 638
 639  fail_syntax:
 640     error_report("invalid guest forwarding rule '%s'", config_str);
 641     return -1;
 642 }
 643
 644 void do_info_usernet(Monitor *mon)
 645 {
 646     SlirpState *s;
 647
 648     QTAILQ_FOREACH(s, &slirp_stacks, entry) {
 649         monitor_printf(mon, "VLAN %d (%s):\n",
 650                        s->nc.vlan ? s->nc.vlan->id : -1,
 651                        s->nc.name);
 652         slirp_connection_info(s->slirp, mon);
 653     }
 654 }
 655
 656 static int net_init_slirp_configs(const char *name, const char *value, void *opaque)
 657 {
 658     struct slirp_config_str *config;
 659
 660     if (strcmp(name, "hostfwd") != 0 && strcmp(name, "guestfwd") != 0) {
 661         return 0;
 662     }
 663
 664     config = g_malloc0(sizeof(*config));
 665
 666     pstrcpy(config->str, sizeof(config->str), value);
 667
 668     if (!strcmp(name, "hostfwd")) {
 669         config->flags = SLIRP_CFG_HOSTFWD;
 670     }
 671
 672     config->next = slirp_configs;
 673     slirp_configs = config;
 674
 675     return 0;
 676 }
 677
 678 int net_init_slirp(QemuOpts *opts,
 679                    Monitor *mon,
 680                    const char *name,
 681                    VLANState *vlan)
 682 {
 683     struct slirp_config_str *config;
 684     const char *vhost;
 685     const char *vhostname;
 686     const char *vdhcp_start;
 687     const char *vnamesrv;
 688     const char *tftp_export;
 689     const char *bootfile;
 690     const char *smb_export;
 691     const char *vsmbsrv;
 692     const char *restrict_opt;
 693     char *vnet = NULL;
 694     int restricted = 0;
 695     int ret;
 696
 697     vhost       = qemu_opt_get(opts, "host");
 698     vhostname   = qemu_opt_get(opts, "hostname");
 699     vdhcp_start = qemu_opt_get(opts, "dhcpstart");
 700     vnamesrv    = qemu_opt_get(opts, "dns");
 701     tftp_export = qemu_opt_get(opts, "tftp");
 702     bootfile    = qemu_opt_get(opts, "bootfile");
 703     smb_export  = qemu_opt_get(opts, "smb");
 704     vsmbsrv     = qemu_opt_get(opts, "smbserver");
 705
 706     restrict_opt = qemu_opt_get(opts, "restrict");
 707     if (restrict_opt) {
 708         if (!strcmp(restrict_opt, "on") ||
 709             !strcmp(restrict_opt, "yes") || !strcmp(restrict_opt, "y")) {
 710             restricted = 1;
 711         } else if (strcmp(restrict_opt, "off") &&
 712             strcmp(restrict_opt, "no") && strcmp(restrict_opt, "n")) {
 713             error_report("invalid option: 'restrict=%s'", restrict_opt);
 714             return -1;
 715         }
 716     }
 717
 718     if (qemu_opt_get(opts, "ip")) {
 719         const char *ip = qemu_opt_get(opts, "ip");
 720         int l = strlen(ip) + strlen("/24") + 1;
 721
 722         vnet = g_malloc(l);
 723
 724         /* emulate legacy ip= parameter */
 725         pstrcpy(vnet, l, ip);
 726         pstrcat(vnet, l, "/24");
 727     }
 728
 729     if (qemu_opt_get(opts, "net")) {
 730         if (vnet) {
 731             g_free(vnet);
 732         }
 733         vnet = g_strdup(qemu_opt_get(opts, "net"));
 734     }
 735
 736     qemu_opt_foreach(opts, net_init_slirp_configs, NULL, 0);
 737
 738     ret = net_slirp_init(vlan, "user", name, restricted, vnet, vhost,
 739                          vhostname, tftp_export, bootfile, vdhcp_start,
 740                          vnamesrv, smb_export, vsmbsrv);
 741
 742     while (slirp_configs) {
 743         config = slirp_configs;
 744         slirp_configs = config->next;
 745         g_free(config);
 746     }
 747
 748     g_free(vnet);
 749
 750     return ret;
 751 }
 752
 753 int net_slirp_parse_legacy(QemuOptsList *opts_list, const char *optarg, int *ret)
 754 {
 755     if (strcmp(opts_list->name, "net") != 0 ||
 756         strncmp(optarg, "channel,", strlen("channel,")) != 0) {
 757         return 0;
 758     }
 759
 760     /* handle legacy -net channel,port:chr */
 761     optarg += strlen("channel,");
 762
 763     if (QTAILQ_EMPTY(&slirp_stacks)) {
 764         struct slirp_config_str *config;
 765
 766         config = g_malloc(sizeof(*config));
 767         pstrcpy(config->str, sizeof(config->str), optarg);
 768         config->flags = SLIRP_CFG_LEGACY;
 769         config->next = slirp_configs;
 770         slirp_configs = config;
 771         *ret = 0;
 772     } else {
 773         *ret = slirp_guestfwd(QTAILQ_FIRST(&slirp_stacks), optarg, 1);
 774     }
 775
 776     return 1;
 777 }
 778