qemu/net/slirp.c
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   1/*
   2 * QEMU System Emulator
   3 *
   4 * Copyright (c) 2003-2008 Fabrice Bellard
   5 *
   6 * Permission is hereby granted, free of charge, to any person obtaining a copy
   7 * of this software and associated documentation files (the "Software"), to deal
   8 * in the Software without restriction, including without limitation the rights
   9 * to use, copy, modify, merge, publish, distribute, sublicense, and/or sell
  10 * copies of the Software, and to permit persons to whom the Software is
  11 * furnished to do so, subject to the following conditions:
  12 *
  13 * The above copyright notice and this permission notice shall be included in
  14 * all copies or substantial portions of the Software.
  15 *
  16 * THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
  17 * IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
  18 * FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL
  19 * THE AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
  20 * LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM,
  21 * OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN
  22 * THE SOFTWARE.
  23 */
  24#include "qemu/osdep.h"
  25#include "net/slirp.h"
  26
  27
  28#ifndef _WIN32
  29#include <pwd.h>
  30#include <sys/wait.h>
  31#endif
  32#include "net/net.h"
  33#include "clients.h"
  34#include "hub.h"
  35#include "monitor/monitor.h"
  36#include "qemu/error-report.h"
  37#include "qemu/sockets.h"
  38#include "slirp/libslirp.h"
  39#include "slirp/ip6.h"
  40#include "sysemu/char.h"
  41#include "sysemu/sysemu.h"
  42#include "qemu/cutils.h"
  43#include "qapi/error.h"
  44
  45static int get_str_sep(char *buf, int buf_size, const char **pp, int sep)
  46{
  47    const char *p, *p1;
  48    int len;
  49    p = *pp;
  50    p1 = strchr(p, sep);
  51    if (!p1)
  52        return -1;
  53    len = p1 - p;
  54    p1++;
  55    if (buf_size > 0) {
  56        if (len > buf_size - 1)
  57            len = buf_size - 1;
  58        memcpy(buf, p, len);
  59        buf[len] = '\0';
  60    }
  61    *pp = p1;
  62    return 0;
  63}
  64
  65/* slirp network adapter */
  66
  67#define SLIRP_CFG_HOSTFWD 1
  68#define SLIRP_CFG_LEGACY  2
  69
  70struct slirp_config_str {
  71    struct slirp_config_str *next;
  72    int flags;
  73    char str[1024];
  74    int legacy_format;
  75};
  76
  77typedef struct SlirpState {
  78    NetClientState nc;
  79    QTAILQ_ENTRY(SlirpState) entry;
  80    Slirp *slirp;
  81    Notifier exit_notifier;
  82#ifndef _WIN32
  83    char smb_dir[128];
  84#endif
  85} SlirpState;
  86
  87static struct slirp_config_str *slirp_configs;
  88const char *legacy_tftp_prefix;
  89const char *legacy_bootp_filename;
  90static QTAILQ_HEAD(slirp_stacks, SlirpState) slirp_stacks =
  91    QTAILQ_HEAD_INITIALIZER(slirp_stacks);
  92
  93static int slirp_hostfwd(SlirpState *s, const char *redir_str,
  94                         int legacy_format);
  95static int slirp_guestfwd(SlirpState *s, const char *config_str,
  96                          int legacy_format);
  97
  98#ifndef _WIN32
  99static const char *legacy_smb_export;
 100
 101static int slirp_smb(SlirpState *s, const char *exported_dir,
 102                     struct in_addr vserver_addr);
 103static void slirp_smb_cleanup(SlirpState *s);
 104#else
 105static inline void slirp_smb_cleanup(SlirpState *s) { }
 106#endif
 107
 108void slirp_output(void *opaque, const uint8_t *pkt, int pkt_len)
 109{
 110    SlirpState *s = opaque;
 111
 112    qemu_send_packet(&s->nc, pkt, pkt_len);
 113}
 114
 115static ssize_t net_slirp_receive(NetClientState *nc, const uint8_t *buf, size_t size)
 116{
 117    SlirpState *s = DO_UPCAST(SlirpState, nc, nc);
 118
 119    slirp_input(s->slirp, buf, size);
 120
 121    return size;
 122}
 123
 124static void slirp_smb_exit(Notifier *n, void *data)
 125{
 126    SlirpState *s = container_of(n, SlirpState, exit_notifier);
 127    slirp_smb_cleanup(s);
 128}
 129
 130static void net_slirp_cleanup(NetClientState *nc)
 131{
 132    SlirpState *s = DO_UPCAST(SlirpState, nc, nc);
 133
 134    slirp_cleanup(s->slirp);
 135    if (s->exit_notifier.notify) {
 136        qemu_remove_exit_notifier(&s->exit_notifier);
 137    }
 138    slirp_smb_cleanup(s);
 139    QTAILQ_REMOVE(&slirp_stacks, s, entry);
 140}
 141
 142static NetClientInfo net_slirp_info = {
 143    .type = NET_CLIENT_DRIVER_USER,
 144    .size = sizeof(SlirpState),
 145    .receive = net_slirp_receive,
 146    .cleanup = net_slirp_cleanup,
 147};
 148
 149static int net_slirp_init(NetClientState *peer, const char *model,
 150                          const char *name, int restricted,
 151                          bool ipv4, const char *vnetwork, const char *vhost,
 152                          bool ipv6, const char *vprefix6, int vprefix6_len,
 153                          const char *vhost6,
 154                          const char *vhostname, const char *tftp_export,
 155                          const char *bootfile, const char *vdhcp_start,
 156                          const char *vnameserver, const char *vnameserver6,
 157                          const char *smb_export, const char *vsmbserver,
 158                          const char **dnssearch)
 159{
 160    /* default settings according to historic slirp */
 161    struct in_addr net  = { .s_addr = htonl(0x0a000200) }; /* 10.0.2.0 */
 162    struct in_addr mask = { .s_addr = htonl(0xffffff00) }; /* 255.255.255.0 */
 163    struct in_addr host = { .s_addr = htonl(0x0a000202) }; /* 10.0.2.2 */
 164    struct in_addr dhcp = { .s_addr = htonl(0x0a00020f) }; /* 10.0.2.15 */
 165    struct in_addr dns  = { .s_addr = htonl(0x0a000203) }; /* 10.0.2.3 */
 166    struct in6_addr ip6_prefix;
 167    struct in6_addr ip6_host;
 168    struct in6_addr ip6_dns;
 169#ifndef _WIN32
 170    struct in_addr smbsrv = { .s_addr = 0 };
 171#endif
 172    NetClientState *nc;
 173    SlirpState *s;
 174    char buf[20];
 175    uint32_t addr;
 176    int shift;
 177    char *end;
 178    struct slirp_config_str *config;
 179
 180    if (!ipv4 && (vnetwork || vhost || vnameserver)) {
 181        return -1;
 182    }
 183
 184    if (!ipv6 && (vprefix6 || vhost6 || vnameserver6)) {
 185        return -1;
 186    }
 187
 188    if (!ipv4 && !ipv6) {
 189        /* It doesn't make sense to disable both */
 190        return -1;
 191    }
 192
 193    if (!tftp_export) {
 194        tftp_export = legacy_tftp_prefix;
 195    }
 196    if (!bootfile) {
 197        bootfile = legacy_bootp_filename;
 198    }
 199
 200    if (vnetwork) {
 201        if (get_str_sep(buf, sizeof(buf), &vnetwork, '/') < 0) {
 202            if (!inet_aton(vnetwork, &net)) {
 203                return -1;
 204            }
 205            addr = ntohl(net.s_addr);
 206            if (!(addr & 0x80000000)) {
 207                mask.s_addr = htonl(0xff000000); /* class A */
 208            } else if ((addr & 0xfff00000) == 0xac100000) {
 209                mask.s_addr = htonl(0xfff00000); /* priv. 172.16.0.0/12 */
 210            } else if ((addr & 0xc0000000) == 0x80000000) {
 211                mask.s_addr = htonl(0xffff0000); /* class B */
 212            } else if ((addr & 0xffff0000) == 0xc0a80000) {
 213                mask.s_addr = htonl(0xffff0000); /* priv. 192.168.0.0/16 */
 214            } else if ((addr & 0xffff0000) == 0xc6120000) {
 215                mask.s_addr = htonl(0xfffe0000); /* tests 198.18.0.0/15 */
 216            } else if ((addr & 0xe0000000) == 0xe0000000) {
 217                mask.s_addr = htonl(0xffffff00); /* class C */
 218            } else {
 219                mask.s_addr = htonl(0xfffffff0); /* multicast/reserved */
 220            }
 221        } else {
 222            if (!inet_aton(buf, &net)) {
 223                return -1;
 224            }
 225            shift = strtol(vnetwork, &end, 10);
 226            if (*end != '\0') {
 227                if (!inet_aton(vnetwork, &mask)) {
 228                    return -1;
 229                }
 230            } else if (shift < 4 || shift > 32) {
 231                return -1;
 232            } else {
 233                mask.s_addr = htonl(0xffffffff << (32 - shift));
 234            }
 235        }
 236        net.s_addr &= mask.s_addr;
 237        host.s_addr = net.s_addr | (htonl(0x0202) & ~mask.s_addr);
 238        dhcp.s_addr = net.s_addr | (htonl(0x020f) & ~mask.s_addr);
 239        dns.s_addr  = net.s_addr | (htonl(0x0203) & ~mask.s_addr);
 240    }
 241
 242    if (vhost && !inet_aton(vhost, &host)) {
 243        return -1;
 244    }
 245    if ((host.s_addr & mask.s_addr) != net.s_addr) {
 246        return -1;
 247    }
 248
 249    if (vnameserver && !inet_aton(vnameserver, &dns)) {
 250        return -1;
 251    }
 252    if ((dns.s_addr & mask.s_addr) != net.s_addr ||
 253        dns.s_addr == host.s_addr) {
 254        return -1;
 255    }
 256
 257    if (vdhcp_start && !inet_aton(vdhcp_start, &dhcp)) {
 258        return -1;
 259    }
 260    if ((dhcp.s_addr & mask.s_addr) != net.s_addr ||
 261        dhcp.s_addr == host.s_addr || dhcp.s_addr == dns.s_addr) {
 262        return -1;
 263    }
 264
 265#ifndef _WIN32
 266    if (vsmbserver && !inet_aton(vsmbserver, &smbsrv)) {
 267        return -1;
 268    }
 269#endif
 270
 271#if defined(_WIN32) && (_WIN32_WINNT < 0x0600)
 272    /* No inet_pton helper before Vista... */
 273    if (vprefix6) {
 274        /* Unsupported */
 275        return -1;
 276    }
 277    memset(&ip6_prefix, 0, sizeof(ip6_prefix));
 278    ip6_prefix.s6_addr[0] = 0xfe;
 279    ip6_prefix.s6_addr[1] = 0xc0;
 280#else
 281    if (!vprefix6) {
 282        vprefix6 = "fec0::";
 283    }
 284    if (!inet_pton(AF_INET6, vprefix6, &ip6_prefix)) {
 285        return -1;
 286    }
 287#endif
 288
 289    if (!vprefix6_len) {
 290        vprefix6_len = 64;
 291    }
 292    if (vprefix6_len < 0 || vprefix6_len > 126) {
 293        return -1;
 294    }
 295
 296    if (vhost6) {
 297#if defined(_WIN32) && (_WIN32_WINNT < 0x0600)
 298        return -1;
 299#else
 300        if (!inet_pton(AF_INET6, vhost6, &ip6_host)) {
 301            return -1;
 302        }
 303        if (!in6_equal_net(&ip6_prefix, &ip6_host, vprefix6_len)) {
 304            return -1;
 305        }
 306#endif
 307    } else {
 308        ip6_host = ip6_prefix;
 309        ip6_host.s6_addr[15] |= 2;
 310    }
 311
 312    if (vnameserver6) {
 313#if defined(_WIN32) && (_WIN32_WINNT < 0x0600)
 314        return -1;
 315#else
 316        if (!inet_pton(AF_INET6, vnameserver6, &ip6_dns)) {
 317            return -1;
 318        }
 319        if (!in6_equal_net(&ip6_prefix, &ip6_dns, vprefix6_len)) {
 320            return -1;
 321        }
 322#endif
 323    } else {
 324        ip6_dns = ip6_prefix;
 325        ip6_dns.s6_addr[15] |= 3;
 326    }
 327
 328
 329    nc = qemu_new_net_client(&net_slirp_info, peer, model, name);
 330
 331    snprintf(nc->info_str, sizeof(nc->info_str),
 332             "net=%s,restrict=%s", inet_ntoa(net),
 333             restricted ? "on" : "off");
 334
 335    s = DO_UPCAST(SlirpState, nc, nc);
 336
 337    s->slirp = slirp_init(restricted, ipv4, net, mask, host,
 338                          ipv6, ip6_prefix, vprefix6_len, ip6_host,
 339                          vhostname, tftp_export, bootfile, dhcp,
 340                          dns, ip6_dns, dnssearch, s);
 341    QTAILQ_INSERT_TAIL(&slirp_stacks, s, entry);
 342
 343    for (config = slirp_configs; config; config = config->next) {
 344        if (config->flags & SLIRP_CFG_HOSTFWD) {
 345            if (slirp_hostfwd(s, config->str,
 346                              config->flags & SLIRP_CFG_LEGACY) < 0)
 347                goto error;
 348        } else {
 349            if (slirp_guestfwd(s, config->str,
 350                               config->flags & SLIRP_CFG_LEGACY) < 0)
 351                goto error;
 352        }
 353    }
 354#ifndef _WIN32
 355    if (!smb_export) {
 356        smb_export = legacy_smb_export;
 357    }
 358    if (smb_export) {
 359        if (slirp_smb(s, smb_export, smbsrv) < 0)
 360            goto error;
 361    }
 362#endif
 363
 364    s->exit_notifier.notify = slirp_smb_exit;
 365    qemu_add_exit_notifier(&s->exit_notifier);
 366    return 0;
 367
 368error:
 369    qemu_del_net_client(nc);
 370    return -1;
 371}
 372
 373static SlirpState *slirp_lookup(Monitor *mon, const char *vlan,
 374                                const char *stack)
 375{
 376
 377    if (vlan) {
 378        NetClientState *nc;
 379        nc = net_hub_find_client_by_name(strtol(vlan, NULL, 0), stack);
 380        if (!nc) {
 381            monitor_printf(mon, "unrecognized (vlan-id, stackname) pair\n");
 382            return NULL;
 383        }
 384        if (strcmp(nc->model, "user")) {
 385            monitor_printf(mon, "invalid device specified\n");
 386            return NULL;
 387        }
 388        return DO_UPCAST(SlirpState, nc, nc);
 389    } else {
 390        if (QTAILQ_EMPTY(&slirp_stacks)) {
 391            monitor_printf(mon, "user mode network stack not in use\n");
 392            return NULL;
 393        }
 394        return QTAILQ_FIRST(&slirp_stacks);
 395    }
 396}
 397
 398void hmp_hostfwd_remove(Monitor *mon, const QDict *qdict)
 399{
 400    struct in_addr host_addr = { .s_addr = INADDR_ANY };
 401    int host_port;
 402    char buf[256];
 403    const char *src_str, *p;
 404    SlirpState *s;
 405    int is_udp = 0;
 406    int err;
 407    const char *arg1 = qdict_get_str(qdict, "arg1");
 408    const char *arg2 = qdict_get_try_str(qdict, "arg2");
 409    const char *arg3 = qdict_get_try_str(qdict, "arg3");
 410
 411    if (arg2) {
 412        s = slirp_lookup(mon, arg1, arg2);
 413        src_str = arg3;
 414    } else {
 415        s = slirp_lookup(mon, NULL, NULL);
 416        src_str = arg1;
 417    }
 418    if (!s) {
 419        return;
 420    }
 421
 422    p = src_str;
 423    if (!p || get_str_sep(buf, sizeof(buf), &p, ':') < 0) {
 424        goto fail_syntax;
 425    }
 426
 427    if (!strcmp(buf, "tcp") || buf[0] == '\0') {
 428        is_udp = 0;
 429    } else if (!strcmp(buf, "udp")) {
 430        is_udp = 1;
 431    } else {
 432        goto fail_syntax;
 433    }
 434
 435    if (get_str_sep(buf, sizeof(buf), &p, ':') < 0) {
 436        goto fail_syntax;
 437    }
 438    if (buf[0] != '\0' && !inet_aton(buf, &host_addr)) {
 439        goto fail_syntax;
 440    }
 441
 442    host_port = atoi(p);
 443
 444    err = slirp_remove_hostfwd(s->slirp, is_udp, host_addr, host_port);
 445
 446    monitor_printf(mon, "host forwarding rule for %s %s\n", src_str,
 447                   err ? "not found" : "removed");
 448    return;
 449
 450 fail_syntax:
 451    monitor_printf(mon, "invalid format\n");
 452}
 453
 454static int slirp_hostfwd(SlirpState *s, const char *redir_str,
 455                         int legacy_format)
 456{
 457    struct in_addr host_addr = { .s_addr = INADDR_ANY };
 458    struct in_addr guest_addr = { .s_addr = 0 };
 459    int host_port, guest_port;
 460    const char *p;
 461    char buf[256];
 462    int is_udp;
 463    char *end;
 464
 465    p = redir_str;
 466    if (!p || get_str_sep(buf, sizeof(buf), &p, ':') < 0) {
 467        goto fail_syntax;
 468    }
 469    if (!strcmp(buf, "tcp") || buf[0] == '\0') {
 470        is_udp = 0;
 471    } else if (!strcmp(buf, "udp")) {
 472        is_udp = 1;
 473    } else {
 474        goto fail_syntax;
 475    }
 476
 477    if (!legacy_format) {
 478        if (get_str_sep(buf, sizeof(buf), &p, ':') < 0) {
 479            goto fail_syntax;
 480        }
 481        if (buf[0] != '\0' && !inet_aton(buf, &host_addr)) {
 482            goto fail_syntax;
 483        }
 484    }
 485
 486    if (get_str_sep(buf, sizeof(buf), &p, legacy_format ? ':' : '-') < 0) {
 487        goto fail_syntax;
 488    }
 489    host_port = strtol(buf, &end, 0);
 490    if (*end != '\0' || host_port < 1 || host_port > 65535) {
 491        goto fail_syntax;
 492    }
 493
 494    if (get_str_sep(buf, sizeof(buf), &p, ':') < 0) {
 495        goto fail_syntax;
 496    }
 497    if (buf[0] != '\0' && !inet_aton(buf, &guest_addr)) {
 498        goto fail_syntax;
 499    }
 500
 501    guest_port = strtol(p, &end, 0);
 502    if (*end != '\0' || guest_port < 1 || guest_port > 65535) {
 503        goto fail_syntax;
 504    }
 505
 506    if (slirp_add_hostfwd(s->slirp, is_udp, host_addr, host_port, guest_addr,
 507                          guest_port) < 0) {
 508        error_report("could not set up host forwarding rule '%s'",
 509                     redir_str);
 510        return -1;
 511    }
 512    return 0;
 513
 514 fail_syntax:
 515    error_report("invalid host forwarding rule '%s'", redir_str);
 516    return -1;
 517}
 518
 519void hmp_hostfwd_add(Monitor *mon, const QDict *qdict)
 520{
 521    const char *redir_str;
 522    SlirpState *s;
 523    const char *arg1 = qdict_get_str(qdict, "arg1");
 524    const char *arg2 = qdict_get_try_str(qdict, "arg2");
 525    const char *arg3 = qdict_get_try_str(qdict, "arg3");
 526
 527    if (arg2) {
 528        s = slirp_lookup(mon, arg1, arg2);
 529        redir_str = arg3;
 530    } else {
 531        s = slirp_lookup(mon, NULL, NULL);
 532        redir_str = arg1;
 533    }
 534    if (s) {
 535        slirp_hostfwd(s, redir_str, 0);
 536    }
 537
 538}
 539
 540int net_slirp_redir(const char *redir_str)
 541{
 542    struct slirp_config_str *config;
 543
 544    if (QTAILQ_EMPTY(&slirp_stacks)) {
 545        config = g_malloc(sizeof(*config));
 546        pstrcpy(config->str, sizeof(config->str), redir_str);
 547        config->flags = SLIRP_CFG_HOSTFWD | SLIRP_CFG_LEGACY;
 548        config->next = slirp_configs;
 549        slirp_configs = config;
 550        return 0;
 551    }
 552
 553    return slirp_hostfwd(QTAILQ_FIRST(&slirp_stacks), redir_str, 1);
 554}
 555
 556#ifndef _WIN32
 557
 558/* automatic user mode samba server configuration */
 559static void slirp_smb_cleanup(SlirpState *s)
 560{
 561    char cmd[128];
 562    int ret;
 563
 564    if (s->smb_dir[0] != '\0') {
 565        snprintf(cmd, sizeof(cmd), "rm -rf %s", s->smb_dir);
 566        ret = system(cmd);
 567        if (ret == -1 || !WIFEXITED(ret)) {
 568            error_report("'%s' failed.", cmd);
 569        } else if (WEXITSTATUS(ret)) {
 570            error_report("'%s' failed. Error code: %d",
 571                         cmd, WEXITSTATUS(ret));
 572        }
 573        s->smb_dir[0] = '\0';
 574    }
 575}
 576
 577static int slirp_smb(SlirpState* s, const char *exported_dir,
 578                     struct in_addr vserver_addr)
 579{
 580    char smb_conf[128];
 581    char smb_cmdline[128];
 582    struct passwd *passwd;
 583    FILE *f;
 584
 585    passwd = getpwuid(geteuid());
 586    if (!passwd) {
 587        error_report("failed to retrieve user name");
 588        return -1;
 589    }
 590
 591    if (access(CONFIG_SMBD_COMMAND, F_OK)) {
 592        error_report("could not find '%s', please install it",
 593                     CONFIG_SMBD_COMMAND);
 594        return -1;
 595    }
 596
 597    if (access(exported_dir, R_OK | X_OK)) {
 598        error_report("error accessing shared directory '%s': %s",
 599                     exported_dir, strerror(errno));
 600        return -1;
 601    }
 602
 603    snprintf(s->smb_dir, sizeof(s->smb_dir), "/tmp/qemu-smb.XXXXXX");
 604    if (!mkdtemp(s->smb_dir)) {
 605        error_report("could not create samba server dir '%s'", s->smb_dir);
 606        s->smb_dir[0] = 0;
 607        return -1;
 608    }
 609    snprintf(smb_conf, sizeof(smb_conf), "%s/%s", s->smb_dir, "smb.conf");
 610
 611    f = fopen(smb_conf, "w");
 612    if (!f) {
 613        slirp_smb_cleanup(s);
 614        error_report("could not create samba server configuration file '%s'",
 615                     smb_conf);
 616        return -1;
 617    }
 618    fprintf(f,
 619            "[global]\n"
 620            "private dir=%s\n"
 621            "interfaces=127.0.0.1\n"
 622            "bind interfaces only=yes\n"
 623            "pid directory=%s\n"
 624            "lock directory=%s\n"
 625            "state directory=%s\n"
 626            "cache directory=%s\n"
 627            "ncalrpc dir=%s/ncalrpc\n"
 628            "log file=%s/log.smbd\n"
 629            "smb passwd file=%s/smbpasswd\n"
 630            "security = user\n"
 631            "map to guest = Bad User\n"
 632            "load printers = no\n"
 633            "printing = bsd\n"
 634            "disable spoolss = yes\n"
 635            "usershare max shares = 0\n"
 636            "[qemu]\n"
 637            "path=%s\n"
 638            "read only=no\n"
 639            "guest ok=yes\n"
 640            "force user=%s\n",
 641            s->smb_dir,
 642            s->smb_dir,
 643            s->smb_dir,
 644            s->smb_dir,
 645            s->smb_dir,
 646            s->smb_dir,
 647            s->smb_dir,
 648            s->smb_dir,
 649            exported_dir,
 650            passwd->pw_name
 651            );
 652    fclose(f);
 653
 654    snprintf(smb_cmdline, sizeof(smb_cmdline), "%s -l %s -s %s",
 655             CONFIG_SMBD_COMMAND, s->smb_dir, smb_conf);
 656
 657    if (slirp_add_exec(s->slirp, 0, smb_cmdline, &vserver_addr, 139) < 0 ||
 658        slirp_add_exec(s->slirp, 0, smb_cmdline, &vserver_addr, 445) < 0) {
 659        slirp_smb_cleanup(s);
 660        error_report("conflicting/invalid smbserver address");
 661        return -1;
 662    }
 663    return 0;
 664}
 665
 666/* automatic user mode samba server configuration (legacy interface) */
 667int net_slirp_smb(const char *exported_dir)
 668{
 669    struct in_addr vserver_addr = { .s_addr = 0 };
 670
 671    if (legacy_smb_export) {
 672        fprintf(stderr, "-smb given twice\n");
 673        return -1;
 674    }
 675    legacy_smb_export = exported_dir;
 676    if (!QTAILQ_EMPTY(&slirp_stacks)) {
 677        return slirp_smb(QTAILQ_FIRST(&slirp_stacks), exported_dir,
 678                         vserver_addr);
 679    }
 680    return 0;
 681}
 682
 683#endif /* !defined(_WIN32) */
 684
 685struct GuestFwd {
 686    CharBackend hd;
 687    struct in_addr server;
 688    int port;
 689    Slirp *slirp;
 690};
 691
 692static int guestfwd_can_read(void *opaque)
 693{
 694    struct GuestFwd *fwd = opaque;
 695    return slirp_socket_can_recv(fwd->slirp, fwd->server, fwd->port);
 696}
 697
 698static void guestfwd_read(void *opaque, const uint8_t *buf, int size)
 699{
 700    struct GuestFwd *fwd = opaque;
 701    slirp_socket_recv(fwd->slirp, fwd->server, fwd->port, buf, size);
 702}
 703
 704static int slirp_guestfwd(SlirpState *s, const char *config_str,
 705                          int legacy_format)
 706{
 707    struct in_addr server = { .s_addr = 0 };
 708    struct GuestFwd *fwd;
 709    const char *p;
 710    char buf[128];
 711    char *end;
 712    int port;
 713
 714    p = config_str;
 715    if (legacy_format) {
 716        if (get_str_sep(buf, sizeof(buf), &p, ':') < 0) {
 717            goto fail_syntax;
 718        }
 719    } else {
 720        if (get_str_sep(buf, sizeof(buf), &p, ':') < 0) {
 721            goto fail_syntax;
 722        }
 723        if (strcmp(buf, "tcp") && buf[0] != '\0') {
 724            goto fail_syntax;
 725        }
 726        if (get_str_sep(buf, sizeof(buf), &p, ':') < 0) {
 727            goto fail_syntax;
 728        }
 729        if (buf[0] != '\0' && !inet_aton(buf, &server)) {
 730            goto fail_syntax;
 731        }
 732        if (get_str_sep(buf, sizeof(buf), &p, '-') < 0) {
 733            goto fail_syntax;
 734        }
 735    }
 736    port = strtol(buf, &end, 10);
 737    if (*end != '\0' || port < 1 || port > 65535) {
 738        goto fail_syntax;
 739    }
 740
 741    snprintf(buf, sizeof(buf), "guestfwd.tcp.%d", port);
 742
 743    if ((strlen(p) > 4) && !strncmp(p, "cmd:", 4)) {
 744        if (slirp_add_exec(s->slirp, 0, &p[4], &server, port) < 0) {
 745            error_report("conflicting/invalid host:port in guest forwarding "
 746                         "rule '%s'", config_str);
 747            return -1;
 748        }
 749    } else {
 750        Error *err = NULL;
 751        Chardev *chr = qemu_chr_new(buf, p);
 752
 753        if (!chr) {
 754            error_report("could not open guest forwarding device '%s'", buf);
 755            return -1;
 756        }
 757
 758        fwd = g_new(struct GuestFwd, 1);
 759        qemu_chr_fe_init(&fwd->hd, chr, &err);
 760        if (err) {
 761            error_report_err(err);
 762            g_free(fwd);
 763            return -1;
 764        }
 765
 766        if (slirp_add_exec(s->slirp, 3, &fwd->hd, &server, port) < 0) {
 767            error_report("conflicting/invalid host:port in guest forwarding "
 768                         "rule '%s'", config_str);
 769            g_free(fwd);
 770            return -1;
 771        }
 772        fwd->server = server;
 773        fwd->port = port;
 774        fwd->slirp = s->slirp;
 775
 776        qemu_chr_fe_set_handlers(&fwd->hd, guestfwd_can_read, guestfwd_read,
 777                                 NULL, fwd, NULL, true);
 778    }
 779    return 0;
 780
 781 fail_syntax:
 782    error_report("invalid guest forwarding rule '%s'", config_str);
 783    return -1;
 784}
 785
 786void hmp_info_usernet(Monitor *mon, const QDict *qdict)
 787{
 788    SlirpState *s;
 789
 790    QTAILQ_FOREACH(s, &slirp_stacks, entry) {
 791        int id;
 792        bool got_vlan_id = net_hub_id_for_client(&s->nc, &id) == 0;
 793        monitor_printf(mon, "VLAN %d (%s):\n",
 794                       got_vlan_id ? id : -1,
 795                       s->nc.name);
 796        slirp_connection_info(s->slirp, mon);
 797    }
 798}
 799
 800static void
 801net_init_slirp_configs(const StringList *fwd, int flags)
 802{
 803    while (fwd) {
 804        struct slirp_config_str *config;
 805
 806        config = g_malloc0(sizeof(*config));
 807        pstrcpy(config->str, sizeof(config->str), fwd->value->str);
 808        config->flags = flags;
 809        config->next = slirp_configs;
 810        slirp_configs = config;
 811
 812        fwd = fwd->next;
 813    }
 814}
 815
 816static const char **slirp_dnssearch(const StringList *dnsname)
 817{
 818    const StringList *c = dnsname;
 819    size_t i = 0, num_opts = 0;
 820    const char **ret;
 821
 822    while (c) {
 823        num_opts++;
 824        c = c->next;
 825    }
 826
 827    if (num_opts == 0) {
 828        return NULL;
 829    }
 830
 831    ret = g_malloc((num_opts + 1) * sizeof(*ret));
 832    c = dnsname;
 833    while (c) {
 834        ret[i++] = c->value->str;
 835        c = c->next;
 836    }
 837    ret[i] = NULL;
 838    return ret;
 839}
 840
 841int net_init_slirp(const Netdev *netdev, const char *name,
 842                   NetClientState *peer, Error **errp)
 843{
 844    /* FIXME error_setg(errp, ...) on failure */
 845    struct slirp_config_str *config;
 846    char *vnet;
 847    int ret;
 848    const NetdevUserOptions *user;
 849    const char **dnssearch;
 850    bool ipv4 = true, ipv6 = true;
 851
 852    assert(netdev->type == NET_CLIENT_DRIVER_USER);
 853    user = &netdev->u.user;
 854
 855    if ((user->has_ipv6 && user->ipv6 && !user->has_ipv4) ||
 856        (user->has_ipv4 && !user->ipv4)) {
 857        ipv4 = 0;
 858    }
 859    if ((user->has_ipv4 && user->ipv4 && !user->has_ipv6) ||
 860        (user->has_ipv6 && !user->ipv6)) {
 861        ipv6 = 0;
 862    }
 863
 864    vnet = user->has_net ? g_strdup(user->net) :
 865           user->has_ip  ? g_strdup_printf("%s/24", user->ip) :
 866           NULL;
 867
 868    dnssearch = slirp_dnssearch(user->dnssearch);
 869
 870    /* all optional fields are initialized to "all bits zero" */
 871
 872    net_init_slirp_configs(user->hostfwd, SLIRP_CFG_HOSTFWD);
 873    net_init_slirp_configs(user->guestfwd, 0);
 874
 875    ret = net_slirp_init(peer, "user", name, user->q_restrict,
 876                         ipv4, vnet, user->host,
 877                         ipv6, user->ipv6_prefix, user->ipv6_prefixlen,
 878                         user->ipv6_host, user->hostname, user->tftp,
 879                         user->bootfile, user->dhcpstart,
 880                         user->dns, user->ipv6_dns, user->smb,
 881                         user->smbserver, dnssearch);
 882
 883    while (slirp_configs) {
 884        config = slirp_configs;
 885        slirp_configs = config->next;
 886        g_free(config);
 887    }
 888
 889    g_free(vnet);
 890    g_free(dnssearch);
 891
 892    return ret;
 893}
 894
 895int net_slirp_parse_legacy(QemuOptsList *opts_list, const char *optarg, int *ret)
 896{
 897    if (strcmp(opts_list->name, "net") != 0 ||
 898        strncmp(optarg, "channel,", strlen("channel,")) != 0) {
 899        return 0;
 900    }
 901
 902    error_report("The '-net channel' option is deprecated. "
 903                 "Please use '-netdev user,guestfwd=...' instead.");
 904
 905    /* handle legacy -net channel,port:chr */
 906    optarg += strlen("channel,");
 907
 908    if (QTAILQ_EMPTY(&slirp_stacks)) {
 909        struct slirp_config_str *config;
 910
 911        config = g_malloc(sizeof(*config));
 912        pstrcpy(config->str, sizeof(config->str), optarg);
 913        config->flags = SLIRP_CFG_LEGACY;
 914        config->next = slirp_configs;
 915        slirp_configs = config;
 916        *ret = 0;
 917    } else {
 918        *ret = slirp_guestfwd(QTAILQ_FIRST(&slirp_stacks), optarg, 1);
 919    }
 920
 921    return 1;
 922}
 923
 924