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 struct GuestFwd {
  79     CharBackend hd;
  80     struct in_addr server;
  81     int port;
  82     Slirp *slirp;
  83 };
  84
  85 typedef struct SlirpState {
  86     NetClientState nc;
  87     QTAILQ_ENTRY(SlirpState) entry;
  88     Slirp *slirp;
  89     Notifier poll_notifier;
  90     Notifier exit_notifier;
  91 #ifndef _WIN32
  92     gchar *smb_dir;
  93 #endif
  94     GSList *fwd;
  95 } SlirpState;
  96
  97 static struct slirp_config_str *slirp_configs;
  98 static QTAILQ_HEAD(, SlirpState) slirp_stacks =
  99     QTAILQ_HEAD_INITIALIZER(slirp_stacks);
 100
 101 static int slirp_hostfwd(SlirpState *s, const char *redir_str, Error **errp);
 102 static int slirp_guestfwd(SlirpState *s, const char *config_str, Error **errp);
 103
 104 #ifndef _WIN32
 105 static int slirp_smb(SlirpState *s, const char *exported_dir,
 106                      struct in_addr vserver_addr, Error **errp);
 107 static void slirp_smb_cleanup(SlirpState *s);
 108 #else
 109 static inline void slirp_smb_cleanup(SlirpState *s) { }
 110 #endif
 111
 112 static ssize_t net_slirp_send_packet(const void *pkt, size_t pkt_len,
 113                                      void *opaque)
 114 {
 115     SlirpState *s = opaque;
 116
 117     return qemu_send_packet(&s->nc, pkt, pkt_len);
 118 }
 119
 120 static ssize_t net_slirp_receive(NetClientState *nc, const uint8_t *buf, size_t size)
 121 {
 122     SlirpState *s = DO_UPCAST(SlirpState, nc, nc);
 123
 124     slirp_input(s->slirp, buf, size);
 125
 126     return size;
 127 }
 128
 129 static void slirp_smb_exit(Notifier *n, void *data)
 130 {
 131     SlirpState *s = container_of(n, SlirpState, exit_notifier);
 132     slirp_smb_cleanup(s);
 133 }
 134
 135 static void slirp_free_fwd(gpointer data)
 136 {
 137     struct GuestFwd *fwd = data;
 138
 139     qemu_chr_fe_deinit(&fwd->hd, true);
 140     g_free(data);
 141 }
 142
 143 static void net_slirp_cleanup(NetClientState *nc)
 144 {
 145     SlirpState *s = DO_UPCAST(SlirpState, nc, nc);
 146
 147     g_slist_free_full(s->fwd, slirp_free_fwd);
 148     main_loop_poll_remove_notifier(&s->poll_notifier);
 149     slirp_cleanup(s->slirp);
 150     if (s->exit_notifier.notify) {
 151         qemu_remove_exit_notifier(&s->exit_notifier);
 152     }
 153     slirp_smb_cleanup(s);
 154     QTAILQ_REMOVE(&slirp_stacks, s, entry);
 155 }
 156
 157 static NetClientInfo net_slirp_info = {
 158     .type = NET_CLIENT_DRIVER_USER,
 159     .size = sizeof(SlirpState),
 160     .receive = net_slirp_receive,
 161     .cleanup = net_slirp_cleanup,
 162 };
 163
 164 static void net_slirp_guest_error(const char *msg, void *opaque)
 165 {
 166     qemu_log_mask(LOG_GUEST_ERROR, "%s", msg);
 167 }
 168
 169 static int64_t net_slirp_clock_get_ns(void *opaque)
 170 {
 171     return qemu_clock_get_ns(QEMU_CLOCK_VIRTUAL);
 172 }
 173
 174 static void *net_slirp_timer_new(SlirpTimerCb cb,
 175                                  void *cb_opaque, void *opaque)
 176 {
 177     return timer_new_full(NULL, QEMU_CLOCK_VIRTUAL,
 178                           SCALE_MS, QEMU_TIMER_ATTR_EXTERNAL,
 179                           cb, cb_opaque);
 180 }
 181
 182 static void net_slirp_timer_free(void *timer, void *opaque)
 183 {
 184     timer_del(timer);
 185     timer_free(timer);
 186 }
 187
 188 static void net_slirp_timer_mod(void *timer, int64_t expire_timer,
 189                                 void *opaque)
 190 {
 191     timer_mod(timer, expire_timer);
 192 }
 193
 194 static void net_slirp_register_poll_fd(int fd, void *opaque)
 195 {
 196     qemu_fd_register(fd);
 197 }
 198
 199 static void net_slirp_unregister_poll_fd(int fd, void *opaque)
 200 {
 201     /* no qemu_fd_unregister */
 202 }
 203
 204 static void net_slirp_notify(void *opaque)
 205 {
 206     qemu_notify_event();
 207 }
 208
 209 static const SlirpCb slirp_cb = {
 210     .send_packet = net_slirp_send_packet,
 211     .guest_error = net_slirp_guest_error,
 212     .clock_get_ns = net_slirp_clock_get_ns,
 213     .timer_new = net_slirp_timer_new,
 214     .timer_free = net_slirp_timer_free,
 215     .timer_mod = net_slirp_timer_mod,
 216     .register_poll_fd = net_slirp_register_poll_fd,
 217     .unregister_poll_fd = net_slirp_unregister_poll_fd,
 218     .notify = net_slirp_notify,
 219 };
 220
 221 static int slirp_poll_to_gio(int events)
 222 {
 223     int ret = 0;
 224
 225     if (events & SLIRP_POLL_IN) {
 226         ret |= G_IO_IN;
 227     }
 228     if (events & SLIRP_POLL_OUT) {
 229         ret |= G_IO_OUT;
 230     }
 231     if (events & SLIRP_POLL_PRI) {
 232         ret |= G_IO_PRI;
 233     }
 234     if (events & SLIRP_POLL_ERR) {
 235         ret |= G_IO_ERR;
 236     }
 237     if (events & SLIRP_POLL_HUP) {
 238         ret |= G_IO_HUP;
 239     }
 240
 241     return ret;
 242 }
 243
 244 static int net_slirp_add_poll(int fd, int events, void *opaque)
 245 {
 246     GArray *pollfds = opaque;
 247     GPollFD pfd = {
 248         .fd = fd,
 249         .events = slirp_poll_to_gio(events),
 250     };
 251     int idx = pollfds->len;
 252     g_array_append_val(pollfds, pfd);
 253     return idx;
 254 }
 255
 256 static int slirp_gio_to_poll(int events)
 257 {
 258     int ret = 0;
 259
 260     if (events & G_IO_IN) {
 261         ret |= SLIRP_POLL_IN;
 262     }
 263     if (events & G_IO_OUT) {
 264         ret |= SLIRP_POLL_OUT;
 265     }
 266     if (events & G_IO_PRI) {
 267         ret |= SLIRP_POLL_PRI;
 268     }
 269     if (events & G_IO_ERR) {
 270         ret |= SLIRP_POLL_ERR;
 271     }
 272     if (events & G_IO_HUP) {
 273         ret |= SLIRP_POLL_HUP;
 274     }
 275
 276     return ret;
 277 }
 278
 279 static int net_slirp_get_revents(int idx, void *opaque)
 280 {
 281     GArray *pollfds = opaque;
 282
 283     return slirp_gio_to_poll(g_array_index(pollfds, GPollFD, idx).revents);
 284 }
 285
 286 static void net_slirp_poll_notify(Notifier *notifier, void *data)
 287 {
 288     MainLoopPoll *poll = data;
 289     SlirpState *s = container_of(notifier, SlirpState, poll_notifier);
 290
 291     switch (poll->state) {
 292     case MAIN_LOOP_POLL_FILL:
 293         slirp_pollfds_fill(s->slirp, &poll->timeout,
 294                            net_slirp_add_poll, poll->pollfds);
 295         break;
 296     case MAIN_LOOP_POLL_OK:
 297     case MAIN_LOOP_POLL_ERR:
 298         slirp_pollfds_poll(s->slirp, poll->state == MAIN_LOOP_POLL_ERR,
 299                            net_slirp_get_revents, poll->pollfds);
 300         break;
 301     default:
 302         g_assert_not_reached();
 303     }
 304 }
 305
 306 static int net_slirp_init(NetClientState *peer, const char *model,
 307                           const char *name, int restricted,
 308                           bool ipv4, const char *vnetwork, const char *vhost,
 309                           bool ipv6, const char *vprefix6, int vprefix6_len,
 310                           const char *vhost6,
 311                           const char *vhostname, const char *tftp_export,
 312                           const char *bootfile, const char *vdhcp_start,
 313                           const char *vnameserver, const char *vnameserver6,
 314                           const char *smb_export, const char *vsmbserver,
 315                           const char **dnssearch, const char *vdomainname,
 316                           const char *tftp_server_name,
 317                           Error **errp)
 318 {
 319     /* default settings according to historic slirp */
 320     struct in_addr net  = { .s_addr = htonl(0x0a000200) }; /* 10.0.2.0 */
 321     struct in_addr mask = { .s_addr = htonl(0xffffff00) }; /* 255.255.255.0 */
 322     struct in_addr host = { .s_addr = htonl(0x0a000202) }; /* 10.0.2.2 */
 323     struct in_addr dhcp = { .s_addr = htonl(0x0a00020f) }; /* 10.0.2.15 */
 324     struct in_addr dns  = { .s_addr = htonl(0x0a000203) }; /* 10.0.2.3 */
 325     struct in6_addr ip6_prefix;
 326     struct in6_addr ip6_host;
 327     struct in6_addr ip6_dns;
 328 #ifndef _WIN32
 329     struct in_addr smbsrv = { .s_addr = 0 };
 330 #endif
 331     NetClientState *nc;
 332     SlirpState *s;
 333     char buf[20];
 334     uint32_t addr;
 335     int shift;
 336     char *end;
 337     struct slirp_config_str *config;
 338
 339     if (!ipv4 && (vnetwork || vhost || vnameserver)) {
 340         error_setg(errp, "IPv4 disabled but netmask/host/dns provided");
 341         return -1;
 342     }
 343
 344     if (!ipv6 && (vprefix6 || vhost6 || vnameserver6)) {
 345         error_setg(errp, "IPv6 disabled but prefix/host6/dns6 provided");
 346         return -1;
 347     }
 348
 349     if (!ipv4 && !ipv6) {
 350         /* It doesn't make sense to disable both */
 351         error_setg(errp, "IPv4 and IPv6 disabled");
 352         return -1;
 353     }
 354
 355     if (vnetwork) {
 356         if (get_str_sep(buf, sizeof(buf), &vnetwork, '/') < 0) {
 357             if (!inet_aton(vnetwork, &net)) {
 358                 error_setg(errp, "Failed to parse netmask");
 359                 return -1;
 360             }
 361             addr = ntohl(net.s_addr);
 362             if (!(addr & 0x80000000)) {
 363                 mask.s_addr = htonl(0xff000000); /* class A */
 364             } else if ((addr & 0xfff00000) == 0xac100000) {
 365                 mask.s_addr = htonl(0xfff00000); /* priv. 172.16.0.0/12 */
 366             } else if ((addr & 0xc0000000) == 0x80000000) {
 367                 mask.s_addr = htonl(0xffff0000); /* class B */
 368             } else if ((addr & 0xffff0000) == 0xc0a80000) {
 369                 mask.s_addr = htonl(0xffff0000); /* priv. 192.168.0.0/16 */
 370             } else if ((addr & 0xffff0000) == 0xc6120000) {
 371                 mask.s_addr = htonl(0xfffe0000); /* tests 198.18.0.0/15 */
 372             } else if ((addr & 0xe0000000) == 0xe0000000) {
 373                 mask.s_addr = htonl(0xffffff00); /* class C */
 374             } else {
 375                 mask.s_addr = htonl(0xfffffff0); /* multicast/reserved */
 376             }
 377         } else {
 378             if (!inet_aton(buf, &net)) {
 379                 error_setg(errp, "Failed to parse netmask");
 380                 return -1;
 381             }
 382             shift = strtol(vnetwork, &end, 10);
 383             if (*end != '\0') {
 384                 if (!inet_aton(vnetwork, &mask)) {
 385                     error_setg(errp,
 386                                "Failed to parse netmask (trailing chars)");
 387                     return -1;
 388                 }
 389             } else if (shift < 4 || shift > 32) {
 390                 error_setg(errp,
 391                            "Invalid netmask provided (must be in range 4-32)");
 392                 return -1;
 393             } else {
 394                 mask.s_addr = htonl(0xffffffff << (32 - shift));
 395             }
 396         }
 397         net.s_addr &= mask.s_addr;
 398         host.s_addr = net.s_addr | (htonl(0x0202) & ~mask.s_addr);
 399         dhcp.s_addr = net.s_addr | (htonl(0x020f) & ~mask.s_addr);
 400         dns.s_addr  = net.s_addr | (htonl(0x0203) & ~mask.s_addr);
 401     }
 402
 403     if (vhost && !inet_aton(vhost, &host)) {
 404         error_setg(errp, "Failed to parse host");
 405         return -1;
 406     }
 407     if ((host.s_addr & mask.s_addr) != net.s_addr) {
 408         error_setg(errp, "Host doesn't belong to network");
 409         return -1;
 410     }
 411
 412     if (vnameserver && !inet_aton(vnameserver, &dns)) {
 413         error_setg(errp, "Failed to parse DNS");
 414         return -1;
 415     }
 416     if ((dns.s_addr & mask.s_addr) != net.s_addr) {
 417         error_setg(errp, "DNS doesn't belong to network");
 418         return -1;
 419     }
 420     if (dns.s_addr == host.s_addr) {
 421         error_setg(errp, "DNS must be different from host");
 422         return -1;
 423     }
 424
 425     if (vdhcp_start && !inet_aton(vdhcp_start, &dhcp)) {
 426         error_setg(errp, "Failed to parse DHCP start address");
 427         return -1;
 428     }
 429     if ((dhcp.s_addr & mask.s_addr) != net.s_addr) {
 430         error_setg(errp, "DHCP doesn't belong to network");
 431         return -1;
 432     }
 433     if (dhcp.s_addr == host.s_addr || dhcp.s_addr == dns.s_addr) {
 434         error_setg(errp, "DNS must be different from host and DNS");
 435         return -1;
 436     }
 437
 438 #ifndef _WIN32
 439     if (vsmbserver && !inet_aton(vsmbserver, &smbsrv)) {
 440         error_setg(errp, "Failed to parse SMB address");
 441         return -1;
 442     }
 443 #endif
 444
 445     if (!vprefix6) {
 446         vprefix6 = "fec0::";
 447     }
 448     if (!inet_pton(AF_INET6, vprefix6, &ip6_prefix)) {
 449         error_setg(errp, "Failed to parse IPv6 prefix");
 450         return -1;
 451     }
 452
 453     if (!vprefix6_len) {
 454         vprefix6_len = 64;
 455     }
 456     if (vprefix6_len < 0 || vprefix6_len > 126) {
 457         error_setg(errp,
 458                    "Invalid prefix provided (prefix len must be in range 0-126");
 459         return -1;
 460     }
 461
 462     if (vhost6) {
 463         if (!inet_pton(AF_INET6, vhost6, &ip6_host)) {
 464             error_setg(errp, "Failed to parse IPv6 host");
 465             return -1;
 466         }
 467         if (!in6_equal_net(&ip6_prefix, &ip6_host, vprefix6_len)) {
 468             error_setg(errp, "IPv6 Host doesn't belong to network");
 469             return -1;
 470         }
 471     } else {
 472         ip6_host = ip6_prefix;
 473         ip6_host.s6_addr[15] |= 2;
 474     }
 475
 476     if (vnameserver6) {
 477         if (!inet_pton(AF_INET6, vnameserver6, &ip6_dns)) {
 478             error_setg(errp, "Failed to parse IPv6 DNS");
 479             return -1;
 480         }
 481         if (!in6_equal_net(&ip6_prefix, &ip6_dns, vprefix6_len)) {
 482             error_setg(errp, "IPv6 DNS doesn't belong to network");
 483             return -1;
 484         }
 485     } else {
 486         ip6_dns = ip6_prefix;
 487         ip6_dns.s6_addr[15] |= 3;
 488     }
 489
 490     if (vdomainname && !*vdomainname) {
 491         error_setg(errp, "'domainname' parameter cannot be empty");
 492         return -1;
 493     }
 494
 495     if (vdomainname && strlen(vdomainname) > 255) {
 496         error_setg(errp, "'domainname' parameter cannot exceed 255 bytes");
 497         return -1;
 498     }
 499
 500     if (vhostname && strlen(vhostname) > 255) {
 501         error_setg(errp, "'vhostname' parameter cannot exceed 255 bytes");
 502         return -1;
 503     }
 504
 505     if (tftp_server_name && strlen(tftp_server_name) > 255) {
 506         error_setg(errp, "'tftp-server-name' parameter cannot exceed 255 bytes");
 507         return -1;
 508     }
 509
 510     nc = qemu_new_net_client(&net_slirp_info, peer, model, name);
 511
 512     snprintf(nc->info_str, sizeof(nc->info_str),
 513              "net=%s,restrict=%s", inet_ntoa(net),
 514              restricted ? "on" : "off");
 515
 516     s = DO_UPCAST(SlirpState, nc, nc);
 517
 518     s->slirp = slirp_init(restricted, ipv4, net, mask, host,
 519                           ipv6, ip6_prefix, vprefix6_len, ip6_host,
 520                           vhostname, tftp_server_name,
 521                           tftp_export, bootfile, dhcp,
 522                           dns, ip6_dns, dnssearch, vdomainname,
 523                           &slirp_cb, s);
 524     QTAILQ_INSERT_TAIL(&slirp_stacks, s, entry);
 525
 526     s->poll_notifier.notify = net_slirp_poll_notify;
 527     main_loop_poll_add_notifier(&s->poll_notifier);
 528
 529     for (config = slirp_configs; config; config = config->next) {
 530         if (config->flags & SLIRP_CFG_HOSTFWD) {
 531             if (slirp_hostfwd(s, config->str, errp) < 0) {
 532                 goto error;
 533             }
 534         } else {
 535             if (slirp_guestfwd(s, config->str, errp) < 0) {
 536                 goto error;
 537             }
 538         }
 539     }
 540 #ifndef _WIN32
 541     if (smb_export) {
 542         if (slirp_smb(s, smb_export, smbsrv, errp) < 0) {
 543             goto error;
 544         }
 545     }
 546 #endif
 547
 548     s->exit_notifier.notify = slirp_smb_exit;
 549     qemu_add_exit_notifier(&s->exit_notifier);
 550     return 0;
 551
 552 error:
 553     qemu_del_net_client(nc);
 554     return -1;
 555 }
 556
 557 static SlirpState *slirp_lookup(Monitor *mon, const char *hub_id,
 558                                 const char *name)
 559 {
 560     if (name) {
 561         NetClientState *nc;
 562         if (hub_id) {
 563             nc = net_hub_find_client_by_name(strtol(hub_id, NULL, 0), name);
 564             if (!nc) {
 565                 monitor_printf(mon, "unrecognized (hub-id, stackname) pair\n");
 566                 return NULL;
 567             }
 568             warn_report("Using 'hub-id' is deprecated, specify the netdev id "
 569                         "directly instead");
 570         } else {
 571             nc = qemu_find_netdev(name);
 572             if (!nc) {
 573                 monitor_printf(mon, "unrecognized netdev id '%s'\n", name);
 574                 return NULL;
 575             }
 576         }
 577         if (strcmp(nc->model, "user")) {
 578             monitor_printf(mon, "invalid device specified\n");
 579             return NULL;
 580         }
 581         return DO_UPCAST(SlirpState, nc, nc);
 582     } else {
 583         if (QTAILQ_EMPTY(&slirp_stacks)) {
 584             monitor_printf(mon, "user mode network stack not in use\n");
 585             return NULL;
 586         }
 587         return QTAILQ_FIRST(&slirp_stacks);
 588     }
 589 }
 590
 591 void hmp_hostfwd_remove(Monitor *mon, const QDict *qdict)
 592 {
 593     struct in_addr host_addr = { .s_addr = INADDR_ANY };
 594     int host_port;
 595     char buf[256];
 596     const char *src_str, *p;
 597     SlirpState *s;
 598     int is_udp = 0;
 599     int err;
 600     const char *arg1 = qdict_get_str(qdict, "arg1");
 601     const char *arg2 = qdict_get_try_str(qdict, "arg2");
 602     const char *arg3 = qdict_get_try_str(qdict, "arg3");
 603
 604     if (arg3) {
 605         s = slirp_lookup(mon, arg1, arg2);
 606         src_str = arg3;
 607     } else if (arg2) {
 608         s = slirp_lookup(mon, NULL, arg1);
 609         src_str = arg2;
 610     } else {
 611         s = slirp_lookup(mon, NULL, NULL);
 612         src_str = arg1;
 613     }
 614     if (!s) {
 615         return;
 616     }
 617
 618     p = src_str;
 619     if (!p || get_str_sep(buf, sizeof(buf), &p, ':') < 0) {
 620         goto fail_syntax;
 621     }
 622
 623     if (!strcmp(buf, "tcp") || buf[0] == '\0') {
 624         is_udp = 0;
 625     } else if (!strcmp(buf, "udp")) {
 626         is_udp = 1;
 627     } else {
 628         goto fail_syntax;
 629     }
 630
 631     if (get_str_sep(buf, sizeof(buf), &p, ':') < 0) {
 632         goto fail_syntax;
 633     }
 634     if (buf[0] != '\0' && !inet_aton(buf, &host_addr)) {
 635         goto fail_syntax;
 636     }
 637
 638     if (qemu_strtoi(p, NULL, 10, &host_port)) {
 639         goto fail_syntax;
 640     }
 641
 642     err = slirp_remove_hostfwd(s->slirp, is_udp, host_addr, host_port);
 643
 644     monitor_printf(mon, "host forwarding rule for %s %s\n", src_str,
 645                    err ? "not found" : "removed");
 646     return;
 647
 648  fail_syntax:
 649     monitor_printf(mon, "invalid format\n");
 650 }
 651
 652 static int slirp_hostfwd(SlirpState *s, const char *redir_str, Error **errp)
 653 {
 654     struct in_addr host_addr = { .s_addr = INADDR_ANY };
 655     struct in_addr guest_addr = { .s_addr = 0 };
 656     int host_port, guest_port;
 657     const char *p;
 658     char buf[256];
 659     int is_udp;
 660     char *end;
 661     const char *fail_reason = "Unknown reason";
 662
 663     p = redir_str;
 664     if (!p || get_str_sep(buf, sizeof(buf), &p, ':') < 0) {
 665         fail_reason = "No : separators";
 666         goto fail_syntax;
 667     }
 668     if (!strcmp(buf, "tcp") || buf[0] == '\0') {
 669         is_udp = 0;
 670     } else if (!strcmp(buf, "udp")) {
 671         is_udp = 1;
 672     } else {
 673         fail_reason = "Bad protocol name";
 674         goto fail_syntax;
 675     }
 676
 677     if (get_str_sep(buf, sizeof(buf), &p, ':') < 0) {
 678         fail_reason = "Missing : separator";
 679         goto fail_syntax;
 680     }
 681     if (buf[0] != '\0' && !inet_aton(buf, &host_addr)) {
 682         fail_reason = "Bad host address";
 683         goto fail_syntax;
 684     }
 685
 686     if (get_str_sep(buf, sizeof(buf), &p, '-') < 0) {
 687         fail_reason = "Bad host port separator";
 688         goto fail_syntax;
 689     }
 690     host_port = strtol(buf, &end, 0);
 691     if (*end != '\0' || host_port < 0 || host_port > 65535) {
 692         fail_reason = "Bad host port";
 693         goto fail_syntax;
 694     }
 695
 696     if (get_str_sep(buf, sizeof(buf), &p, ':') < 0) {
 697         fail_reason = "Missing guest address";
 698         goto fail_syntax;
 699     }
 700     if (buf[0] != '\0' && !inet_aton(buf, &guest_addr)) {
 701         fail_reason = "Bad guest address";
 702         goto fail_syntax;
 703     }
 704
 705     guest_port = strtol(p, &end, 0);
 706     if (*end != '\0' || guest_port < 1 || guest_port > 65535) {
 707         fail_reason = "Bad guest port";
 708         goto fail_syntax;
 709     }
 710
 711     if (slirp_add_hostfwd(s->slirp, is_udp, host_addr, host_port, guest_addr,
 712                           guest_port) < 0) {
 713         error_setg(errp, "Could not set up host forwarding rule '%s'",
 714                    redir_str);
 715         return -1;
 716     }
 717     return 0;
 718
 719  fail_syntax:
 720     error_setg(errp, "Invalid host forwarding rule '%s' (%s)", redir_str,
 721                fail_reason);
 722     return -1;
 723 }
 724
 725 void hmp_hostfwd_add(Monitor *mon, const QDict *qdict)
 726 {
 727     const char *redir_str;
 728     SlirpState *s;
 729     const char *arg1 = qdict_get_str(qdict, "arg1");
 730     const char *arg2 = qdict_get_try_str(qdict, "arg2");
 731     const char *arg3 = qdict_get_try_str(qdict, "arg3");
 732
 733     if (arg3) {
 734         s = slirp_lookup(mon, arg1, arg2);
 735         redir_str = arg3;
 736     } else if (arg2) {
 737         s = slirp_lookup(mon, NULL, arg1);
 738         redir_str = arg2;
 739     } else {
 740         s = slirp_lookup(mon, NULL, NULL);
 741         redir_str = arg1;
 742     }
 743     if (s) {
 744         Error *err = NULL;
 745         if (slirp_hostfwd(s, redir_str, &err) < 0) {
 746             error_report_err(err);
 747         }
 748     }
 749
 750 }
 751
 752 #ifndef _WIN32
 753
 754 /* automatic user mode samba server configuration */
 755 static void slirp_smb_cleanup(SlirpState *s)
 756 {
 757     int ret;
 758
 759     if (s->smb_dir) {
 760         gchar *cmd = g_strdup_printf("rm -rf %s", s->smb_dir);
 761         ret = system(cmd);
 762         if (ret == -1 || !WIFEXITED(ret)) {
 763             error_report("'%s' failed.", cmd);
 764         } else if (WEXITSTATUS(ret)) {
 765             error_report("'%s' failed. Error code: %d",
 766                          cmd, WEXITSTATUS(ret));
 767         }
 768         g_free(cmd);
 769         g_free(s->smb_dir);
 770         s->smb_dir = NULL;
 771     }
 772 }
 773
 774 static int slirp_smb(SlirpState* s, const char *exported_dir,
 775                      struct in_addr vserver_addr, Error **errp)
 776 {
 777     char *smb_conf;
 778     char *smb_cmdline;
 779     struct passwd *passwd;
 780     FILE *f;
 781
 782     passwd = getpwuid(geteuid());
 783     if (!passwd) {
 784         error_setg(errp, "Failed to retrieve user name");
 785         return -1;
 786     }
 787
 788     if (access(CONFIG_SMBD_COMMAND, F_OK)) {
 789         error_setg(errp, "Could not find '%s', please install it",
 790                    CONFIG_SMBD_COMMAND);
 791         return -1;
 792     }
 793
 794     if (access(exported_dir, R_OK | X_OK)) {
 795         error_setg(errp, "Error accessing shared directory '%s': %s",
 796                    exported_dir, strerror(errno));
 797         return -1;
 798     }
 799
 800     s->smb_dir = g_dir_make_tmp("qemu-smb.XXXXXX", NULL);
 801     if (!s->smb_dir) {
 802         error_setg(errp, "Could not create samba server dir");
 803         return -1;
 804     }
 805     smb_conf = g_strdup_printf("%s/%s", s->smb_dir, "smb.conf");
 806
 807     f = fopen(smb_conf, "w");
 808     if (!f) {
 809         slirp_smb_cleanup(s);
 810         error_setg(errp,
 811                    "Could not create samba server configuration file '%s'",
 812                     smb_conf);
 813         g_free(smb_conf);
 814         return -1;
 815     }
 816     fprintf(f,
 817             "[global]\n"
 818             "private dir=%s\n"
 819             "interfaces=127.0.0.1\n"
 820             "bind interfaces only=yes\n"
 821             "pid directory=%s\n"
 822             "lock directory=%s\n"
 823             "state directory=%s\n"
 824             "cache directory=%s\n"
 825             "ncalrpc dir=%s/ncalrpc\n"
 826             "log file=%s/log.smbd\n"
 827             "smb passwd file=%s/smbpasswd\n"
 828             "security = user\n"
 829             "map to guest = Bad User\n"
 830             "load printers = no\n"
 831             "printing = bsd\n"
 832             "disable spoolss = yes\n"
 833             "usershare max shares = 0\n"
 834             "[qemu]\n"
 835             "path=%s\n"
 836             "read only=no\n"
 837             "guest ok=yes\n"
 838             "force user=%s\n",
 839             s->smb_dir,
 840             s->smb_dir,
 841             s->smb_dir,
 842             s->smb_dir,
 843             s->smb_dir,
 844             s->smb_dir,
 845             s->smb_dir,
 846             s->smb_dir,
 847             exported_dir,
 848             passwd->pw_name
 849             );
 850     fclose(f);
 851
 852     smb_cmdline = g_strdup_printf("%s -l %s -s %s",
 853              CONFIG_SMBD_COMMAND, s->smb_dir, smb_conf);
 854     g_free(smb_conf);
 855
 856     if (slirp_add_exec(s->slirp, smb_cmdline, &vserver_addr, 139) < 0 ||
 857         slirp_add_exec(s->slirp, smb_cmdline, &vserver_addr, 445) < 0) {
 858         slirp_smb_cleanup(s);
 859         g_free(smb_cmdline);
 860         error_setg(errp, "Conflicting/invalid smbserver address");
 861         return -1;
 862     }
 863     g_free(smb_cmdline);
 864     return 0;
 865 }
 866
 867 #endif /* !defined(_WIN32) */
 868
 869 static int guestfwd_can_read(void *opaque)
 870 {
 871     struct GuestFwd *fwd = opaque;
 872     return slirp_socket_can_recv(fwd->slirp, fwd->server, fwd->port);
 873 }
 874
 875 static void guestfwd_read(void *opaque, const uint8_t *buf, int size)
 876 {
 877     struct GuestFwd *fwd = opaque;
 878     slirp_socket_recv(fwd->slirp, fwd->server, fwd->port, buf, size);
 879 }
 880
 881 static ssize_t guestfwd_write(const void *buf, size_t len, void *chr)
 882 {
 883     return qemu_chr_fe_write_all(chr, buf, len);
 884 }
 885
 886 static int slirp_guestfwd(SlirpState *s, const char *config_str, Error **errp)
 887 {
 888     struct in_addr server = { .s_addr = 0 };
 889     struct GuestFwd *fwd;
 890     const char *p;
 891     char buf[128];
 892     char *end;
 893     int port;
 894
 895     p = config_str;
 896     if (get_str_sep(buf, sizeof(buf), &p, ':') < 0) {
 897         goto fail_syntax;
 898     }
 899     if (strcmp(buf, "tcp") && buf[0] != '\0') {
 900         goto fail_syntax;
 901     }
 902     if (get_str_sep(buf, sizeof(buf), &p, ':') < 0) {
 903         goto fail_syntax;
 904     }
 905     if (buf[0] != '\0' && !inet_aton(buf, &server)) {
 906         goto fail_syntax;
 907     }
 908     if (get_str_sep(buf, sizeof(buf), &p, '-') < 0) {
 909         goto fail_syntax;
 910     }
 911     port = strtol(buf, &end, 10);
 912     if (*end != '\0' || port < 1 || port > 65535) {
 913         goto fail_syntax;
 914     }
 915
 916     snprintf(buf, sizeof(buf), "guestfwd.tcp.%d", port);
 917
 918     if (g_str_has_prefix(p, "cmd:")) {
 919         if (slirp_add_exec(s->slirp, &p[4], &server, port) < 0) {
 920             error_setg(errp, "Conflicting/invalid host:port in guest "
 921                        "forwarding rule '%s'", config_str);
 922             return -1;
 923         }
 924     } else {
 925         Error *err = NULL;
 926         /*
 927          * FIXME: sure we want to support implicit
 928          * muxed monitors here?
 929          */
 930         Chardev *chr = qemu_chr_new_mux_mon(buf, p, NULL);
 931
 932         if (!chr) {
 933             error_setg(errp, "Could not open guest forwarding device '%s'",
 934                        buf);
 935             return -1;
 936         }
 937
 938         fwd = g_new(struct GuestFwd, 1);
 939         qemu_chr_fe_init(&fwd->hd, chr, &err);
 940         if (err) {
 941             error_propagate(errp, err);
 942             object_unparent(OBJECT(chr));
 943             g_free(fwd);
 944             return -1;
 945         }
 946
 947         if (slirp_add_guestfwd(s->slirp, guestfwd_write, &fwd->hd,
 948                                &server, port) < 0) {
 949             error_setg(errp, "Conflicting/invalid host:port in guest "
 950                        "forwarding rule '%s'", config_str);
 951             qemu_chr_fe_deinit(&fwd->hd, true);
 952             g_free(fwd);
 953             return -1;
 954         }
 955         fwd->server = server;
 956         fwd->port = port;
 957         fwd->slirp = s->slirp;
 958
 959         qemu_chr_fe_set_handlers(&fwd->hd, guestfwd_can_read, guestfwd_read,
 960                                  NULL, NULL, fwd, NULL, true);
 961         s->fwd = g_slist_append(s->fwd, fwd);
 962     }
 963     return 0;
 964
 965  fail_syntax:
 966     error_setg(errp, "Invalid guest forwarding rule '%s'", config_str);
 967     return -1;
 968 }
 969
 970 void hmp_info_usernet(Monitor *mon, const QDict *qdict)
 971 {
 972     SlirpState *s;
 973
 974     QTAILQ_FOREACH(s, &slirp_stacks, entry) {
 975         int id;
 976         bool got_hub_id = net_hub_id_for_client(&s->nc, &id) == 0;
 977         char *info = slirp_connection_info(s->slirp);
 978         monitor_printf(mon, "Hub %d (%s):\n%s",
 979                        got_hub_id ? id : -1,
 980                        s->nc.name, info);
 981         g_free(info);
 982     }
 983 }
 984
 985 static void
 986 net_init_slirp_configs(const StringList *fwd, int flags)
 987 {
 988     while (fwd) {
 989         struct slirp_config_str *config;
 990
 991         config = g_malloc0(sizeof(*config));
 992         pstrcpy(config->str, sizeof(config->str), fwd->value->str);
 993         config->flags = flags;
 994         config->next = slirp_configs;
 995         slirp_configs = config;
 996
 997         fwd = fwd->next;
 998     }
 999 }
1000
1001 static const char **slirp_dnssearch(const StringList *dnsname)
1002 {
1003     const StringList *c = dnsname;
1004     size_t i = 0, num_opts = 0;
1005     const char **ret;
1006
1007     while (c) {
1008         num_opts++;
1009         c = c->next;
1010     }
1011
1012     if (num_opts == 0) {
1013         return NULL;
1014     }
1015
1016     ret = g_malloc((num_opts + 1) * sizeof(*ret));
1017     c = dnsname;
1018     while (c) {
1019         ret[i++] = c->value->str;
1020         c = c->next;
1021     }
1022     ret[i] = NULL;
1023     return ret;
1024 }
1025
1026 int net_init_slirp(const Netdev *netdev, const char *name,
1027                    NetClientState *peer, Error **errp)
1028 {
1029     struct slirp_config_str *config;
1030     char *vnet;
1031     int ret;
1032     const NetdevUserOptions *user;
1033     const char **dnssearch;
1034     bool ipv4 = true, ipv6 = true;
1035
1036     assert(netdev->type == NET_CLIENT_DRIVER_USER);
1037     user = &netdev->u.user;
1038
1039     if ((user->has_ipv6 && user->ipv6 && !user->has_ipv4) ||
1040         (user->has_ipv4 && !user->ipv4)) {
1041         ipv4 = 0;
1042     }
1043     if ((user->has_ipv4 && user->ipv4 && !user->has_ipv6) ||
1044         (user->has_ipv6 && !user->ipv6)) {
1045         ipv6 = 0;
1046     }
1047
1048     vnet = user->has_net ? g_strdup(user->net) :
1049            user->has_ip  ? g_strdup_printf("%s/24", user->ip) :
1050            NULL;
1051
1052     dnssearch = slirp_dnssearch(user->dnssearch);
1053
1054     /* all optional fields are initialized to "all bits zero" */
1055
1056     net_init_slirp_configs(user->hostfwd, SLIRP_CFG_HOSTFWD);
1057     net_init_slirp_configs(user->guestfwd, 0);
1058
1059     ret = net_slirp_init(peer, "user", name, user->q_restrict,
1060                          ipv4, vnet, user->host,
1061                          ipv6, user->ipv6_prefix, user->ipv6_prefixlen,
1062                          user->ipv6_host, user->hostname, user->tftp,
1063                          user->bootfile, user->dhcpstart,
1064                          user->dns, user->ipv6_dns, user->smb,
1065                          user->smbserver, dnssearch, user->domainname,
1066                          user->tftp_server_name, errp);
1067
1068     while (slirp_configs) {
1069         config = slirp_configs;
1070         slirp_configs = config->next;
1071         g_free(config);
1072     }
1073
1074     g_free(vnet);
1075     g_free(dnssearch);
1076
1077     return ret;
1078 }