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 <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 #include "migration/register.h"
  48 #include "migration/qemu-file-types.h"
  49
  50 static int get_str_sep(char *buf, int buf_size, const char **pp, int sep)
  51 {
  52     const char *p, *p1;
  53     int len;
  54     p = *pp;
  55     p1 = strchr(p, sep);
  56     if (!p1)
  57         return -1;
  58     len = p1 - p;
  59     p1++;
  60     if (buf_size > 0) {
  61         if (len > buf_size - 1)
  62             len = buf_size - 1;
  63         memcpy(buf, p, len);
  64         buf[len] = '\0';
  65     }
  66     *pp = p1;
  67     return 0;
  68 }
  69
  70 /* slirp network adapter */
  71
  72 #define SLIRP_CFG_HOSTFWD 1
  73
  74 struct slirp_config_str {
  75     struct slirp_config_str *next;
  76     int flags;
  77     char str[1024];
  78 };
  79
  80 struct GuestFwd {
  81     CharBackend hd;
  82     struct in_addr server;
  83     int port;
  84     Slirp *slirp;
  85 };
  86
  87 typedef struct SlirpState {
  88     NetClientState nc;
  89     QTAILQ_ENTRY(SlirpState) entry;
  90     Slirp *slirp;
  91     Notifier poll_notifier;
  92     Notifier exit_notifier;
  93 #ifndef _WIN32
  94     gchar *smb_dir;
  95 #endif
  96     GSList *fwd;
  97 } SlirpState;
  98
  99 static struct slirp_config_str *slirp_configs;
 100 static QTAILQ_HEAD(, SlirpState) slirp_stacks =
 101     QTAILQ_HEAD_INITIALIZER(slirp_stacks);
 102
 103 static int slirp_hostfwd(SlirpState *s, const char *redir_str, Error **errp);
 104 static int slirp_guestfwd(SlirpState *s, const char *config_str, Error **errp);
 105
 106 #ifndef _WIN32
 107 static int slirp_smb(SlirpState *s, const char *exported_dir,
 108                      struct in_addr vserver_addr, Error **errp);
 109 static void slirp_smb_cleanup(SlirpState *s);
 110 #else
 111 static inline void slirp_smb_cleanup(SlirpState *s) { }
 112 #endif
 113
 114 static ssize_t net_slirp_send_packet(const void *pkt, size_t pkt_len,
 115                                      void *opaque)
 116 {
 117     SlirpState *s = opaque;
 118
 119     return qemu_send_packet(&s->nc, pkt, pkt_len);
 120 }
 121
 122 static ssize_t net_slirp_receive(NetClientState *nc, const uint8_t *buf, size_t size)
 123 {
 124     SlirpState *s = DO_UPCAST(SlirpState, nc, nc);
 125
 126     slirp_input(s->slirp, buf, size);
 127
 128     return size;
 129 }
 130
 131 static void slirp_smb_exit(Notifier *n, void *data)
 132 {
 133     SlirpState *s = container_of(n, SlirpState, exit_notifier);
 134     slirp_smb_cleanup(s);
 135 }
 136
 137 static void slirp_free_fwd(gpointer data)
 138 {
 139     struct GuestFwd *fwd = data;
 140
 141     qemu_chr_fe_deinit(&fwd->hd, true);
 142     g_free(data);
 143 }
 144
 145 static void net_slirp_cleanup(NetClientState *nc)
 146 {
 147     SlirpState *s = DO_UPCAST(SlirpState, nc, nc);
 148
 149     g_slist_free_full(s->fwd, slirp_free_fwd);
 150     main_loop_poll_remove_notifier(&s->poll_notifier);
 151     unregister_savevm(NULL, "slirp", s->slirp);
 152     slirp_cleanup(s->slirp);
 153     if (s->exit_notifier.notify) {
 154         qemu_remove_exit_notifier(&s->exit_notifier);
 155     }
 156     slirp_smb_cleanup(s);
 157     QTAILQ_REMOVE(&slirp_stacks, s, entry);
 158 }
 159
 160 static NetClientInfo net_slirp_info = {
 161     .type = NET_CLIENT_DRIVER_USER,
 162     .size = sizeof(SlirpState),
 163     .receive = net_slirp_receive,
 164     .cleanup = net_slirp_cleanup,
 165 };
 166
 167 static void net_slirp_guest_error(const char *msg, void *opaque)
 168 {
 169     qemu_log_mask(LOG_GUEST_ERROR, "%s", msg);
 170 }
 171
 172 static int64_t net_slirp_clock_get_ns(void *opaque)
 173 {
 174     return qemu_clock_get_ns(QEMU_CLOCK_VIRTUAL);
 175 }
 176
 177 static void *net_slirp_timer_new(SlirpTimerCb cb,
 178                                  void *cb_opaque, void *opaque)
 179 {
 180     return timer_new_full(NULL, QEMU_CLOCK_VIRTUAL,
 181                           SCALE_MS, QEMU_TIMER_ATTR_EXTERNAL,
 182                           cb, cb_opaque);
 183 }
 184
 185 static void net_slirp_timer_free(void *timer, void *opaque)
 186 {
 187     timer_free(timer);
 188 }
 189
 190 static void net_slirp_timer_mod(void *timer, int64_t expire_timer,
 191                                 void *opaque)
 192 {
 193     timer_mod(timer, expire_timer);
 194 }
 195
 196 static void net_slirp_register_poll_fd(int fd, void *opaque)
 197 {
 198     qemu_fd_register(fd);
 199 }
 200
 201 static void net_slirp_unregister_poll_fd(int fd, void *opaque)
 202 {
 203     /* no qemu_fd_unregister */
 204 }
 205
 206 static void net_slirp_notify(void *opaque)
 207 {
 208     qemu_notify_event();
 209 }
 210
 211 static const SlirpCb slirp_cb = {
 212     .send_packet = net_slirp_send_packet,
 213     .guest_error = net_slirp_guest_error,
 214     .clock_get_ns = net_slirp_clock_get_ns,
 215     .timer_new = net_slirp_timer_new,
 216     .timer_free = net_slirp_timer_free,
 217     .timer_mod = net_slirp_timer_mod,
 218     .register_poll_fd = net_slirp_register_poll_fd,
 219     .unregister_poll_fd = net_slirp_unregister_poll_fd,
 220     .notify = net_slirp_notify,
 221 };
 222
 223 static int slirp_poll_to_gio(int events)
 224 {
 225     int ret = 0;
 226
 227     if (events & SLIRP_POLL_IN) {
 228         ret |= G_IO_IN;
 229     }
 230     if (events & SLIRP_POLL_OUT) {
 231         ret |= G_IO_OUT;
 232     }
 233     if (events & SLIRP_POLL_PRI) {
 234         ret |= G_IO_PRI;
 235     }
 236     if (events & SLIRP_POLL_ERR) {
 237         ret |= G_IO_ERR;
 238     }
 239     if (events & SLIRP_POLL_HUP) {
 240         ret |= G_IO_HUP;
 241     }
 242
 243     return ret;
 244 }
 245
 246 static int net_slirp_add_poll(int fd, int events, void *opaque)
 247 {
 248     GArray *pollfds = opaque;
 249     GPollFD pfd = {
 250         .fd = fd,
 251         .events = slirp_poll_to_gio(events),
 252     };
 253     int idx = pollfds->len;
 254     g_array_append_val(pollfds, pfd);
 255     return idx;
 256 }
 257
 258 static int slirp_gio_to_poll(int events)
 259 {
 260     int ret = 0;
 261
 262     if (events & G_IO_IN) {
 263         ret |= SLIRP_POLL_IN;
 264     }
 265     if (events & G_IO_OUT) {
 266         ret |= SLIRP_POLL_OUT;
 267     }
 268     if (events & G_IO_PRI) {
 269         ret |= SLIRP_POLL_PRI;
 270     }
 271     if (events & G_IO_ERR) {
 272         ret |= SLIRP_POLL_ERR;
 273     }
 274     if (events & G_IO_HUP) {
 275         ret |= SLIRP_POLL_HUP;
 276     }
 277
 278     return ret;
 279 }
 280
 281 static int net_slirp_get_revents(int idx, void *opaque)
 282 {
 283     GArray *pollfds = opaque;
 284
 285     return slirp_gio_to_poll(g_array_index(pollfds, GPollFD, idx).revents);
 286 }
 287
 288 static void net_slirp_poll_notify(Notifier *notifier, void *data)
 289 {
 290     MainLoopPoll *poll = data;
 291     SlirpState *s = container_of(notifier, SlirpState, poll_notifier);
 292
 293     switch (poll->state) {
 294     case MAIN_LOOP_POLL_FILL:
 295         slirp_pollfds_fill(s->slirp, &poll->timeout,
 296                            net_slirp_add_poll, poll->pollfds);
 297         break;
 298     case MAIN_LOOP_POLL_OK:
 299     case MAIN_LOOP_POLL_ERR:
 300         slirp_pollfds_poll(s->slirp, poll->state == MAIN_LOOP_POLL_ERR,
 301                            net_slirp_get_revents, poll->pollfds);
 302         break;
 303     default:
 304         g_assert_not_reached();
 305     }
 306 }
 307
 308 static ssize_t
 309 net_slirp_stream_read(void *buf, size_t size, void *opaque)
 310 {
 311     QEMUFile *f = opaque;
 312
 313     return qemu_get_buffer(f, buf, size);
 314 }
 315
 316 static ssize_t
 317 net_slirp_stream_write(const void *buf, size_t size, void *opaque)
 318 {
 319     QEMUFile *f = opaque;
 320
 321     qemu_put_buffer(f, buf, size);
 322     if (qemu_file_get_error(f)) {
 323         return -1;
 324     }
 325
 326     return size;
 327 }
 328
 329 static int net_slirp_state_load(QEMUFile *f, void *opaque, int version_id)
 330 {
 331     Slirp *slirp = opaque;
 332
 333     return slirp_state_load(slirp, version_id, net_slirp_stream_read, f);
 334 }
 335
 336 static void net_slirp_state_save(QEMUFile *f, void *opaque)
 337 {
 338     Slirp *slirp = opaque;
 339
 340     slirp_state_save(slirp, net_slirp_stream_write, f);
 341 }
 342
 343 static SaveVMHandlers savevm_slirp_state = {
 344     .save_state = net_slirp_state_save,
 345     .load_state = net_slirp_state_load,
 346 };
 347
 348 static int net_slirp_init(NetClientState *peer, const char *model,
 349                           const char *name, int restricted,
 350                           bool ipv4, const char *vnetwork, const char *vhost,
 351                           bool ipv6, const char *vprefix6, int vprefix6_len,
 352                           const char *vhost6,
 353                           const char *vhostname, const char *tftp_export,
 354                           const char *bootfile, const char *vdhcp_start,
 355                           const char *vnameserver, const char *vnameserver6,
 356                           const char *smb_export, const char *vsmbserver,
 357                           const char **dnssearch, const char *vdomainname,
 358                           const char *tftp_server_name,
 359                           Error **errp)
 360 {
 361     /* default settings according to historic slirp */
 362     struct in_addr net  = { .s_addr = htonl(0x0a000200) }; /* 10.0.2.0 */
 363     struct in_addr mask = { .s_addr = htonl(0xffffff00) }; /* 255.255.255.0 */
 364     struct in_addr host = { .s_addr = htonl(0x0a000202) }; /* 10.0.2.2 */
 365     struct in_addr dhcp = { .s_addr = htonl(0x0a00020f) }; /* 10.0.2.15 */
 366     struct in_addr dns  = { .s_addr = htonl(0x0a000203) }; /* 10.0.2.3 */
 367     struct in6_addr ip6_prefix;
 368     struct in6_addr ip6_host;
 369     struct in6_addr ip6_dns;
 370 #ifndef _WIN32
 371     struct in_addr smbsrv = { .s_addr = 0 };
 372 #endif
 373     NetClientState *nc;
 374     SlirpState *s;
 375     char buf[20];
 376     uint32_t addr;
 377     int shift;
 378     char *end;
 379     struct slirp_config_str *config;
 380
 381     if (!ipv4 && (vnetwork || vhost || vnameserver)) {
 382         error_setg(errp, "IPv4 disabled but netmask/host/dns provided");
 383         return -1;
 384     }
 385
 386     if (!ipv6 && (vprefix6 || vhost6 || vnameserver6)) {
 387         error_setg(errp, "IPv6 disabled but prefix/host6/dns6 provided");
 388         return -1;
 389     }
 390
 391     if (!ipv4 && !ipv6) {
 392         /* It doesn't make sense to disable both */
 393         error_setg(errp, "IPv4 and IPv6 disabled");
 394         return -1;
 395     }
 396
 397     if (vnetwork) {
 398         if (get_str_sep(buf, sizeof(buf), &vnetwork, '/') < 0) {
 399             if (!inet_aton(vnetwork, &net)) {
 400                 error_setg(errp, "Failed to parse netmask");
 401                 return -1;
 402             }
 403             addr = ntohl(net.s_addr);
 404             if (!(addr & 0x80000000)) {
 405                 mask.s_addr = htonl(0xff000000); /* class A */
 406             } else if ((addr & 0xfff00000) == 0xac100000) {
 407                 mask.s_addr = htonl(0xfff00000); /* priv. 172.16.0.0/12 */
 408             } else if ((addr & 0xc0000000) == 0x80000000) {
 409                 mask.s_addr = htonl(0xffff0000); /* class B */
 410             } else if ((addr & 0xffff0000) == 0xc0a80000) {
 411                 mask.s_addr = htonl(0xffff0000); /* priv. 192.168.0.0/16 */
 412             } else if ((addr & 0xffff0000) == 0xc6120000) {
 413                 mask.s_addr = htonl(0xfffe0000); /* tests 198.18.0.0/15 */
 414             } else if ((addr & 0xe0000000) == 0xe0000000) {
 415                 mask.s_addr = htonl(0xffffff00); /* class C */
 416             } else {
 417                 mask.s_addr = htonl(0xfffffff0); /* multicast/reserved */
 418             }
 419         } else {
 420             if (!inet_aton(buf, &net)) {
 421                 error_setg(errp, "Failed to parse netmask");
 422                 return -1;
 423             }
 424             shift = strtol(vnetwork, &end, 10);
 425             if (*end != '\0') {
 426                 if (!inet_aton(vnetwork, &mask)) {
 427                     error_setg(errp,
 428                                "Failed to parse netmask (trailing chars)");
 429                     return -1;
 430                 }
 431             } else if (shift < 4 || shift > 32) {
 432                 error_setg(errp,
 433                            "Invalid netmask provided (must be in range 4-32)");
 434                 return -1;
 435             } else {
 436                 mask.s_addr = htonl(0xffffffff << (32 - shift));
 437             }
 438         }
 439         net.s_addr &= mask.s_addr;
 440         host.s_addr = net.s_addr | (htonl(0x0202) & ~mask.s_addr);
 441         dhcp.s_addr = net.s_addr | (htonl(0x020f) & ~mask.s_addr);
 442         dns.s_addr  = net.s_addr | (htonl(0x0203) & ~mask.s_addr);
 443     }
 444
 445     if (vhost && !inet_aton(vhost, &host)) {
 446         error_setg(errp, "Failed to parse host");
 447         return -1;
 448     }
 449     if ((host.s_addr & mask.s_addr) != net.s_addr) {
 450         error_setg(errp, "Host doesn't belong to network");
 451         return -1;
 452     }
 453
 454     if (vnameserver && !inet_aton(vnameserver, &dns)) {
 455         error_setg(errp, "Failed to parse DNS");
 456         return -1;
 457     }
 458     if (restricted && (dns.s_addr & mask.s_addr) != net.s_addr) {
 459         error_setg(errp, "DNS doesn't belong to network");
 460         return -1;
 461     }
 462     if (dns.s_addr == host.s_addr) {
 463         error_setg(errp, "DNS must be different from host");
 464         return -1;
 465     }
 466
 467     if (vdhcp_start && !inet_aton(vdhcp_start, &dhcp)) {
 468         error_setg(errp, "Failed to parse DHCP start address");
 469         return -1;
 470     }
 471     if ((dhcp.s_addr & mask.s_addr) != net.s_addr) {
 472         error_setg(errp, "DHCP doesn't belong to network");
 473         return -1;
 474     }
 475     if (dhcp.s_addr == host.s_addr || dhcp.s_addr == dns.s_addr) {
 476         error_setg(errp, "DHCP must be different from host and DNS");
 477         return -1;
 478     }
 479
 480 #ifndef _WIN32
 481     if (vsmbserver && !inet_aton(vsmbserver, &smbsrv)) {
 482         error_setg(errp, "Failed to parse SMB address");
 483         return -1;
 484     }
 485 #endif
 486
 487     if (!vprefix6) {
 488         vprefix6 = "fec0::";
 489     }
 490     if (!inet_pton(AF_INET6, vprefix6, &ip6_prefix)) {
 491         error_setg(errp, "Failed to parse IPv6 prefix");
 492         return -1;
 493     }
 494
 495     if (!vprefix6_len) {
 496         vprefix6_len = 64;
 497     }
 498     if (vprefix6_len < 0 || vprefix6_len > 126) {
 499         error_setg(errp,
 500                    "Invalid IPv6 prefix provided "
 501                    "(IPv6 prefix length must be between 0 and 126)");
 502         return -1;
 503     }
 504
 505     if (vhost6) {
 506         if (!inet_pton(AF_INET6, vhost6, &ip6_host)) {
 507             error_setg(errp, "Failed to parse IPv6 host");
 508             return -1;
 509         }
 510         if (!in6_equal_net(&ip6_prefix, &ip6_host, vprefix6_len)) {
 511             error_setg(errp, "IPv6 Host doesn't belong to network");
 512             return -1;
 513         }
 514     } else {
 515         ip6_host = ip6_prefix;
 516         ip6_host.s6_addr[15] |= 2;
 517     }
 518
 519     if (vnameserver6) {
 520         if (!inet_pton(AF_INET6, vnameserver6, &ip6_dns)) {
 521             error_setg(errp, "Failed to parse IPv6 DNS");
 522             return -1;
 523         }
 524         if (restricted && !in6_equal_net(&ip6_prefix, &ip6_dns, vprefix6_len)) {
 525             error_setg(errp, "IPv6 DNS doesn't belong to network");
 526             return -1;
 527         }
 528     } else {
 529         ip6_dns = ip6_prefix;
 530         ip6_dns.s6_addr[15] |= 3;
 531     }
 532
 533     if (vdomainname && !*vdomainname) {
 534         error_setg(errp, "'domainname' parameter cannot be empty");
 535         return -1;
 536     }
 537
 538     if (vdomainname && strlen(vdomainname) > 255) {
 539         error_setg(errp, "'domainname' parameter cannot exceed 255 bytes");
 540         return -1;
 541     }
 542
 543     if (vhostname && strlen(vhostname) > 255) {
 544         error_setg(errp, "'vhostname' parameter cannot exceed 255 bytes");
 545         return -1;
 546     }
 547
 548     if (tftp_server_name && strlen(tftp_server_name) > 255) {
 549         error_setg(errp, "'tftp-server-name' parameter cannot exceed 255 bytes");
 550         return -1;
 551     }
 552
 553     nc = qemu_new_net_client(&net_slirp_info, peer, model, name);
 554
 555     snprintf(nc->info_str, sizeof(nc->info_str),
 556              "net=%s,restrict=%s", inet_ntoa(net),
 557              restricted ? "on" : "off");
 558
 559     s = DO_UPCAST(SlirpState, nc, nc);
 560
 561     s->slirp = slirp_init(restricted, ipv4, net, mask, host,
 562                           ipv6, ip6_prefix, vprefix6_len, ip6_host,
 563                           vhostname, tftp_server_name,
 564                           tftp_export, bootfile, dhcp,
 565                           dns, ip6_dns, dnssearch, vdomainname,
 566                           &slirp_cb, s);
 567     QTAILQ_INSERT_TAIL(&slirp_stacks, s, entry);
 568
 569     /*
 570      * Make sure the current bitstream version of slirp is 4, to avoid
 571      * QEMU migration incompatibilities, if upstream slirp bumped the
 572      * version.
 573      *
 574      * FIXME: use bitfields of features? teach libslirp to save with
 575      * specific version?
 576      */
 577     g_assert(slirp_state_version() == 4);
 578     register_savevm_live("slirp", 0, slirp_state_version(),
 579                          &savevm_slirp_state, s->slirp);
 580
 581     s->poll_notifier.notify = net_slirp_poll_notify;
 582     main_loop_poll_add_notifier(&s->poll_notifier);
 583
 584     for (config = slirp_configs; config; config = config->next) {
 585         if (config->flags & SLIRP_CFG_HOSTFWD) {
 586             if (slirp_hostfwd(s, config->str, errp) < 0) {
 587                 goto error;
 588             }
 589         } else {
 590             if (slirp_guestfwd(s, config->str, errp) < 0) {
 591                 goto error;
 592             }
 593         }
 594     }
 595 #ifndef _WIN32
 596     if (smb_export) {
 597         if (slirp_smb(s, smb_export, smbsrv, errp) < 0) {
 598             goto error;
 599         }
 600     }
 601 #endif
 602
 603     s->exit_notifier.notify = slirp_smb_exit;
 604     qemu_add_exit_notifier(&s->exit_notifier);
 605     return 0;
 606
 607 error:
 608     qemu_del_net_client(nc);
 609     return -1;
 610 }
 611
 612 static SlirpState *slirp_lookup(Monitor *mon, const char *id)
 613 {
 614     if (id) {
 615         NetClientState *nc = qemu_find_netdev(id);
 616         if (!nc) {
 617             monitor_printf(mon, "unrecognized netdev id '%s'\n", id);
 618             return NULL;
 619         }
 620         if (strcmp(nc->model, "user")) {
 621             monitor_printf(mon, "invalid device specified\n");
 622             return NULL;
 623         }
 624         return DO_UPCAST(SlirpState, nc, nc);
 625     } else {
 626         if (QTAILQ_EMPTY(&slirp_stacks)) {
 627             monitor_printf(mon, "user mode network stack not in use\n");
 628             return NULL;
 629         }
 630         return QTAILQ_FIRST(&slirp_stacks);
 631     }
 632 }
 633
 634 void hmp_hostfwd_remove(Monitor *mon, const QDict *qdict)
 635 {
 636     struct in_addr host_addr = { .s_addr = INADDR_ANY };
 637     int host_port;
 638     char buf[256];
 639     const char *src_str, *p;
 640     SlirpState *s;
 641     int is_udp = 0;
 642     int err;
 643     const char *arg1 = qdict_get_str(qdict, "arg1");
 644     const char *arg2 = qdict_get_try_str(qdict, "arg2");
 645
 646     if (arg2) {
 647         s = slirp_lookup(mon, arg1);
 648         src_str = arg2;
 649     } else {
 650         s = slirp_lookup(mon, NULL);
 651         src_str = arg1;
 652     }
 653     if (!s) {
 654         return;
 655     }
 656
 657     p = src_str;
 658     if (!p || get_str_sep(buf, sizeof(buf), &p, ':') < 0) {
 659         goto fail_syntax;
 660     }
 661
 662     if (!strcmp(buf, "tcp") || buf[0] == '\0') {
 663         is_udp = 0;
 664     } else if (!strcmp(buf, "udp")) {
 665         is_udp = 1;
 666     } else {
 667         goto fail_syntax;
 668     }
 669
 670     if (get_str_sep(buf, sizeof(buf), &p, ':') < 0) {
 671         goto fail_syntax;
 672     }
 673     if (buf[0] != '\0' && !inet_aton(buf, &host_addr)) {
 674         goto fail_syntax;
 675     }
 676
 677     if (qemu_strtoi(p, NULL, 10, &host_port)) {
 678         goto fail_syntax;
 679     }
 680
 681     err = slirp_remove_hostfwd(s->slirp, is_udp, host_addr, host_port);
 682
 683     monitor_printf(mon, "host forwarding rule for %s %s\n", src_str,
 684                    err ? "not found" : "removed");
 685     return;
 686
 687  fail_syntax:
 688     monitor_printf(mon, "invalid format\n");
 689 }
 690
 691 static int slirp_hostfwd(SlirpState *s, const char *redir_str, Error **errp)
 692 {
 693     struct in_addr host_addr = { .s_addr = INADDR_ANY };
 694     struct in_addr guest_addr = { .s_addr = 0 };
 695     int host_port, guest_port;
 696     const char *p;
 697     char buf[256];
 698     int is_udp;
 699     char *end;
 700     const char *fail_reason = "Unknown reason";
 701
 702     p = redir_str;
 703     if (!p || get_str_sep(buf, sizeof(buf), &p, ':') < 0) {
 704         fail_reason = "No : separators";
 705         goto fail_syntax;
 706     }
 707     if (!strcmp(buf, "tcp") || buf[0] == '\0') {
 708         is_udp = 0;
 709     } else if (!strcmp(buf, "udp")) {
 710         is_udp = 1;
 711     } else {
 712         fail_reason = "Bad protocol name";
 713         goto fail_syntax;
 714     }
 715
 716     if (get_str_sep(buf, sizeof(buf), &p, ':') < 0) {
 717         fail_reason = "Missing : separator";
 718         goto fail_syntax;
 719     }
 720     if (buf[0] != '\0' && !inet_aton(buf, &host_addr)) {
 721         fail_reason = "Bad host address";
 722         goto fail_syntax;
 723     }
 724
 725     if (get_str_sep(buf, sizeof(buf), &p, '-') < 0) {
 726         fail_reason = "Bad host port separator";
 727         goto fail_syntax;
 728     }
 729     host_port = strtol(buf, &end, 0);
 730     if (*end != '\0' || host_port < 0 || host_port > 65535) {
 731         fail_reason = "Bad host port";
 732         goto fail_syntax;
 733     }
 734
 735     if (get_str_sep(buf, sizeof(buf), &p, ':') < 0) {
 736         fail_reason = "Missing guest address";
 737         goto fail_syntax;
 738     }
 739     if (buf[0] != '\0' && !inet_aton(buf, &guest_addr)) {
 740         fail_reason = "Bad guest address";
 741         goto fail_syntax;
 742     }
 743
 744     guest_port = strtol(p, &end, 0);
 745     if (*end != '\0' || guest_port < 1 || guest_port > 65535) {
 746         fail_reason = "Bad guest port";
 747         goto fail_syntax;
 748     }
 749
 750     if (slirp_add_hostfwd(s->slirp, is_udp, host_addr, host_port, guest_addr,
 751                           guest_port) < 0) {
 752         error_setg(errp, "Could not set up host forwarding rule '%s'",
 753                    redir_str);
 754         return -1;
 755     }
 756     return 0;
 757
 758  fail_syntax:
 759     error_setg(errp, "Invalid host forwarding rule '%s' (%s)", redir_str,
 760                fail_reason);
 761     return -1;
 762 }
 763
 764 void hmp_hostfwd_add(Monitor *mon, const QDict *qdict)
 765 {
 766     const char *redir_str;
 767     SlirpState *s;
 768     const char *arg1 = qdict_get_str(qdict, "arg1");
 769     const char *arg2 = qdict_get_try_str(qdict, "arg2");
 770
 771     if (arg2) {
 772         s = slirp_lookup(mon, arg1);
 773         redir_str = arg2;
 774     } else {
 775         s = slirp_lookup(mon, NULL);
 776         redir_str = arg1;
 777     }
 778     if (s) {
 779         Error *err = NULL;
 780         if (slirp_hostfwd(s, redir_str, &err) < 0) {
 781             error_report_err(err);
 782         }
 783     }
 784
 785 }
 786
 787 #ifndef _WIN32
 788
 789 /* automatic user mode samba server configuration */
 790 static void slirp_smb_cleanup(SlirpState *s)
 791 {
 792     int ret;
 793
 794     if (s->smb_dir) {
 795         gchar *cmd = g_strdup_printf("rm -rf %s", s->smb_dir);
 796         ret = system(cmd);
 797         if (ret == -1 || !WIFEXITED(ret)) {
 798             error_report("'%s' failed.", cmd);
 799         } else if (WEXITSTATUS(ret)) {
 800             error_report("'%s' failed. Error code: %d",
 801                          cmd, WEXITSTATUS(ret));
 802         }
 803         g_free(cmd);
 804         g_free(s->smb_dir);
 805         s->smb_dir = NULL;
 806     }
 807 }
 808
 809 static int slirp_smb(SlirpState* s, const char *exported_dir,
 810                      struct in_addr vserver_addr, Error **errp)
 811 {
 812     char *smb_conf;
 813     char *smb_cmdline;
 814     struct passwd *passwd;
 815     FILE *f;
 816
 817     passwd = getpwuid(geteuid());
 818     if (!passwd) {
 819         error_setg(errp, "Failed to retrieve user name");
 820         return -1;
 821     }
 822
 823     if (access(CONFIG_SMBD_COMMAND, F_OK)) {
 824         error_setg(errp, "Could not find '%s', please install it",
 825                    CONFIG_SMBD_COMMAND);
 826         return -1;
 827     }
 828
 829     if (access(exported_dir, R_OK | X_OK)) {
 830         error_setg(errp, "Error accessing shared directory '%s': %s",
 831                    exported_dir, strerror(errno));
 832         return -1;
 833     }
 834
 835     s->smb_dir = g_dir_make_tmp("qemu-smb.XXXXXX", NULL);
 836     if (!s->smb_dir) {
 837         error_setg(errp, "Could not create samba server dir");
 838         return -1;
 839     }
 840     smb_conf = g_strdup_printf("%s/%s", s->smb_dir, "smb.conf");
 841
 842     f = fopen(smb_conf, "w");
 843     if (!f) {
 844         slirp_smb_cleanup(s);
 845         error_setg(errp,
 846                    "Could not create samba server configuration file '%s'",
 847                     smb_conf);
 848         g_free(smb_conf);
 849         return -1;
 850     }
 851     fprintf(f,
 852             "[global]\n"
 853             "private dir=%s\n"
 854             "interfaces=127.0.0.1\n"
 855             "bind interfaces only=yes\n"
 856             "pid directory=%s\n"
 857             "lock directory=%s\n"
 858             "state directory=%s\n"
 859             "cache directory=%s\n"
 860             "ncalrpc dir=%s/ncalrpc\n"
 861             "log file=%s/log.smbd\n"
 862             "smb passwd file=%s/smbpasswd\n"
 863             "security = user\n"
 864             "map to guest = Bad User\n"
 865             "load printers = no\n"
 866             "printing = bsd\n"
 867             "disable spoolss = yes\n"
 868             "usershare max shares = 0\n"
 869             "[qemu]\n"
 870             "path=%s\n"
 871             "read only=no\n"
 872             "guest ok=yes\n"
 873             "force user=%s\n",
 874             s->smb_dir,
 875             s->smb_dir,
 876             s->smb_dir,
 877             s->smb_dir,
 878             s->smb_dir,
 879             s->smb_dir,
 880             s->smb_dir,
 881             s->smb_dir,
 882             exported_dir,
 883             passwd->pw_name
 884             );
 885     fclose(f);
 886
 887     smb_cmdline = g_strdup_printf("%s -l %s -s %s",
 888              CONFIG_SMBD_COMMAND, s->smb_dir, smb_conf);
 889     g_free(smb_conf);
 890
 891     if (slirp_add_exec(s->slirp, smb_cmdline, &vserver_addr, 139) < 0 ||
 892         slirp_add_exec(s->slirp, smb_cmdline, &vserver_addr, 445) < 0) {
 893         slirp_smb_cleanup(s);
 894         g_free(smb_cmdline);
 895         error_setg(errp, "Conflicting/invalid smbserver address");
 896         return -1;
 897     }
 898     g_free(smb_cmdline);
 899     return 0;
 900 }
 901
 902 #endif /* !defined(_WIN32) */
 903
 904 static int guestfwd_can_read(void *opaque)
 905 {
 906     struct GuestFwd *fwd = opaque;
 907     return slirp_socket_can_recv(fwd->slirp, fwd->server, fwd->port);
 908 }
 909
 910 static void guestfwd_read(void *opaque, const uint8_t *buf, int size)
 911 {
 912     struct GuestFwd *fwd = opaque;
 913     slirp_socket_recv(fwd->slirp, fwd->server, fwd->port, buf, size);
 914 }
 915
 916 static ssize_t guestfwd_write(const void *buf, size_t len, void *chr)
 917 {
 918     return qemu_chr_fe_write_all(chr, buf, len);
 919 }
 920
 921 static int slirp_guestfwd(SlirpState *s, const char *config_str, Error **errp)
 922 {
 923     /* TODO: IPv6 */
 924     struct in_addr server = { .s_addr = 0 };
 925     struct GuestFwd *fwd;
 926     const char *p;
 927     char buf[128];
 928     char *end;
 929     int port;
 930
 931     p = config_str;
 932     if (get_str_sep(buf, sizeof(buf), &p, ':') < 0) {
 933         goto fail_syntax;
 934     }
 935     if (strcmp(buf, "tcp") && buf[0] != '\0') {
 936         goto fail_syntax;
 937     }
 938     if (get_str_sep(buf, sizeof(buf), &p, ':') < 0) {
 939         goto fail_syntax;
 940     }
 941     if (buf[0] != '\0' && !inet_aton(buf, &server)) {
 942         goto fail_syntax;
 943     }
 944     if (get_str_sep(buf, sizeof(buf), &p, '-') < 0) {
 945         goto fail_syntax;
 946     }
 947     port = strtol(buf, &end, 10);
 948     if (*end != '\0' || port < 1 || port > 65535) {
 949         goto fail_syntax;
 950     }
 951
 952     snprintf(buf, sizeof(buf), "guestfwd.tcp.%d", port);
 953
 954     if (g_str_has_prefix(p, "cmd:")) {
 955         if (slirp_add_exec(s->slirp, &p[4], &server, port) < 0) {
 956             error_setg(errp, "Conflicting/invalid host:port in guest "
 957                        "forwarding rule '%s'", config_str);
 958             return -1;
 959         }
 960     } else {
 961         Error *err = NULL;
 962         /*
 963          * FIXME: sure we want to support implicit
 964          * muxed monitors here?
 965          */
 966         Chardev *chr = qemu_chr_new_mux_mon(buf, p, NULL);
 967
 968         if (!chr) {
 969             error_setg(errp, "Could not open guest forwarding device '%s'",
 970                        buf);
 971             return -1;
 972         }
 973
 974         fwd = g_new(struct GuestFwd, 1);
 975         qemu_chr_fe_init(&fwd->hd, chr, &err);
 976         if (err) {
 977             error_propagate(errp, err);
 978             object_unparent(OBJECT(chr));
 979             g_free(fwd);
 980             return -1;
 981         }
 982
 983         if (slirp_add_guestfwd(s->slirp, guestfwd_write, &fwd->hd,
 984                                &server, port) < 0) {
 985             error_setg(errp, "Conflicting/invalid host:port in guest "
 986                        "forwarding rule '%s'", config_str);
 987             qemu_chr_fe_deinit(&fwd->hd, true);
 988             g_free(fwd);
 989             return -1;
 990         }
 991         fwd->server = server;
 992         fwd->port = port;
 993         fwd->slirp = s->slirp;
 994
 995         qemu_chr_fe_set_handlers(&fwd->hd, guestfwd_can_read, guestfwd_read,
 996                                  NULL, NULL, fwd, NULL, true);
 997         s->fwd = g_slist_append(s->fwd, fwd);
 998     }
 999     return 0;
1000
1001  fail_syntax:
1002     error_setg(errp, "Invalid guest forwarding rule '%s'", config_str);
1003     return -1;
1004 }
1005
1006 void hmp_info_usernet(Monitor *mon, const QDict *qdict)
1007 {
1008     SlirpState *s;
1009
1010     QTAILQ_FOREACH(s, &slirp_stacks, entry) {
1011         int id;
1012         bool got_hub_id = net_hub_id_for_client(&s->nc, &id) == 0;
1013         char *info = slirp_connection_info(s->slirp);
1014         monitor_printf(mon, "Hub %d (%s):\n%s",
1015                        got_hub_id ? id : -1,
1016                        s->nc.name, info);
1017         g_free(info);
1018     }
1019 }
1020
1021 static void
1022 net_init_slirp_configs(const StringList *fwd, int flags)
1023 {
1024     while (fwd) {
1025         struct slirp_config_str *config;
1026
1027         config = g_malloc0(sizeof(*config));
1028         pstrcpy(config->str, sizeof(config->str), fwd->value->str);
1029         config->flags = flags;
1030         config->next = slirp_configs;
1031         slirp_configs = config;
1032
1033         fwd = fwd->next;
1034     }
1035 }
1036
1037 static const char **slirp_dnssearch(const StringList *dnsname)
1038 {
1039     const StringList *c = dnsname;
1040     size_t i = 0, num_opts = 0;
1041     const char **ret;
1042
1043     while (c) {
1044         num_opts++;
1045         c = c->next;
1046     }
1047
1048     if (num_opts == 0) {
1049         return NULL;
1050     }
1051
1052     ret = g_malloc((num_opts + 1) * sizeof(*ret));
1053     c = dnsname;
1054     while (c) {
1055         ret[i++] = c->value->str;
1056         c = c->next;
1057     }
1058     ret[i] = NULL;
1059     return ret;
1060 }
1061
1062 int net_init_slirp(const Netdev *netdev, const char *name,
1063                    NetClientState *peer, Error **errp)
1064 {
1065     struct slirp_config_str *config;
1066     char *vnet;
1067     int ret;
1068     const NetdevUserOptions *user;
1069     const char **dnssearch;
1070     bool ipv4 = true, ipv6 = true;
1071
1072     assert(netdev->type == NET_CLIENT_DRIVER_USER);
1073     user = &netdev->u.user;
1074
1075     if ((user->has_ipv6 && user->ipv6 && !user->has_ipv4) ||
1076         (user->has_ipv4 && !user->ipv4)) {
1077         ipv4 = 0;
1078     }
1079     if ((user->has_ipv4 && user->ipv4 && !user->has_ipv6) ||
1080         (user->has_ipv6 && !user->ipv6)) {
1081         ipv6 = 0;
1082     }
1083
1084     vnet = user->has_net ? g_strdup(user->net) :
1085            user->has_ip  ? g_strdup_printf("%s/24", user->ip) :
1086            NULL;
1087
1088     dnssearch = slirp_dnssearch(user->dnssearch);
1089
1090     /* all optional fields are initialized to "all bits zero" */
1091
1092     net_init_slirp_configs(user->hostfwd, SLIRP_CFG_HOSTFWD);
1093     net_init_slirp_configs(user->guestfwd, 0);
1094
1095     ret = net_slirp_init(peer, "user", name, user->q_restrict,
1096                          ipv4, vnet, user->host,
1097                          ipv6, user->ipv6_prefix, user->ipv6_prefixlen,
1098                          user->ipv6_host, user->hostname, user->tftp,
1099                          user->bootfile, user->dhcpstart,
1100                          user->dns, user->ipv6_dns, user->smb,
1101                          user->smbserver, dnssearch, user->domainname,
1102                          user->tftp_server_name, errp);
1103
1104     while (slirp_configs) {
1105         config = slirp_configs;
1106         slirp_configs = config->next;
1107         g_free(config);
1108     }
1109
1110     g_free(vnet);
1111     g_free(dnssearch);
1112
1113     return ret;
1114 }