cachepc-qemu

Fork of AMDESE/qemu with changes for cachepc side-channel attack
git clone https://git.sinitax.com/sinitax/cachepc-qemu
Log | Files | Refs | Submodules | LICENSE | sfeed.txt

slirp.c (32021B)

      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#if defined(CONFIG_SLIRP_SMBD)
     31#include <pwd.h>
     32#include <sys/wait.h>
     33#endif
     34#include "net/eth.h"
     35#include "net/net.h"
     36#include "clients.h"
     37#include "hub.h"
     38#include "monitor/monitor.h"
     39#include "qemu/error-report.h"
     40#include "qemu/sockets.h"
     41#include <libslirp.h>
     42#include "chardev/char-fe.h"
     43#include "sysemu/sysemu.h"
     44#include "qemu/cutils.h"
     45#include "qapi/error.h"
     46#include "qapi/qmp/qdict.h"
     47#include "util.h"
     48#include "migration/register.h"
     49#include "migration/qemu-file-types.h"
     50
     51static int get_str_sep(char *buf, int buf_size, const char **pp, int sep)
     52{
     53    const char *p, *p1;
     54    int len;
     55    p = *pp;
     56    p1 = strchr(p, sep);
     57    if (!p1)
     58        return -1;
     59    len = p1 - p;
     60    p1++;
     61    if (buf_size > 0) {
     62        if (len > buf_size - 1)
     63            len = buf_size - 1;
     64        memcpy(buf, p, len);
     65        buf[len] = '\0';
     66    }
     67    *pp = p1;
     68    return 0;
     69}
     70
     71/* slirp network adapter */
     72
     73#define SLIRP_CFG_HOSTFWD 1
     74
     75struct slirp_config_str {
     76    struct slirp_config_str *next;
     77    int flags;
     78    char str[1024];
     79};
     80
     81struct GuestFwd {
     82    CharBackend hd;
     83    struct in_addr server;
     84    int port;
     85    Slirp *slirp;
     86};
     87
     88typedef struct SlirpState {
     89    NetClientState nc;
     90    QTAILQ_ENTRY(SlirpState) entry;
     91    Slirp *slirp;
     92    Notifier poll_notifier;
     93    Notifier exit_notifier;
     94#if defined(CONFIG_SLIRP_SMBD)
     95    gchar *smb_dir;
     96#endif
     97    GSList *fwd;
     98} SlirpState;
     99
    100static struct slirp_config_str *slirp_configs;
    101static QTAILQ_HEAD(, SlirpState) slirp_stacks =
    102    QTAILQ_HEAD_INITIALIZER(slirp_stacks);
    103
    104static int slirp_hostfwd(SlirpState *s, const char *redir_str, Error **errp);
    105static int slirp_guestfwd(SlirpState *s, const char *config_str, Error **errp);
    106
    107#if defined(CONFIG_SLIRP_SMBD)
    108static int slirp_smb(SlirpState *s, const char *exported_dir,
    109                     struct in_addr vserver_addr, Error **errp);
    110static void slirp_smb_cleanup(SlirpState *s);
    111#else
    112static inline void slirp_smb_cleanup(SlirpState *s) { }
    113#endif
    114
    115static ssize_t net_slirp_send_packet(const void *pkt, size_t pkt_len,
    116                                     void *opaque)
    117{
    118    SlirpState *s = opaque;
    119    uint8_t min_pkt[ETH_ZLEN];
    120    size_t min_pktsz = sizeof(min_pkt);
    121
    122    if (net_peer_needs_padding(&s->nc)) {
    123        if (eth_pad_short_frame(min_pkt, &min_pktsz, pkt, pkt_len)) {
    124            pkt = min_pkt;
    125            pkt_len = min_pktsz;
    126        }
    127    }
    128
    129    return qemu_send_packet(&s->nc, pkt, pkt_len);
    130}
    131
    132static ssize_t net_slirp_receive(NetClientState *nc, const uint8_t *buf, size_t size)
    133{
    134    SlirpState *s = DO_UPCAST(SlirpState, nc, nc);
    135
    136    slirp_input(s->slirp, buf, size);
    137
    138    return size;
    139}
    140
    141static void slirp_smb_exit(Notifier *n, void *data)
    142{
    143    SlirpState *s = container_of(n, SlirpState, exit_notifier);
    144    slirp_smb_cleanup(s);
    145}
    146
    147static void slirp_free_fwd(gpointer data)
    148{
    149    struct GuestFwd *fwd = data;
    150
    151    qemu_chr_fe_deinit(&fwd->hd, true);
    152    g_free(data);
    153}
    154
    155static void net_slirp_cleanup(NetClientState *nc)
    156{
    157    SlirpState *s = DO_UPCAST(SlirpState, nc, nc);
    158
    159    g_slist_free_full(s->fwd, slirp_free_fwd);
    160    main_loop_poll_remove_notifier(&s->poll_notifier);
    161    unregister_savevm(NULL, "slirp", s->slirp);
    162    slirp_cleanup(s->slirp);
    163    if (s->exit_notifier.notify) {
    164        qemu_remove_exit_notifier(&s->exit_notifier);
    165    }
    166    slirp_smb_cleanup(s);
    167    QTAILQ_REMOVE(&slirp_stacks, s, entry);
    168}
    169
    170static NetClientInfo net_slirp_info = {
    171    .type = NET_CLIENT_DRIVER_USER,
    172    .size = sizeof(SlirpState),
    173    .receive = net_slirp_receive,
    174    .cleanup = net_slirp_cleanup,
    175};
    176
    177static void net_slirp_guest_error(const char *msg, void *opaque)
    178{
    179    qemu_log_mask(LOG_GUEST_ERROR, "%s", msg);
    180}
    181
    182static int64_t net_slirp_clock_get_ns(void *opaque)
    183{
    184    return qemu_clock_get_ns(QEMU_CLOCK_VIRTUAL);
    185}
    186
    187static void *net_slirp_timer_new(SlirpTimerCb cb,
    188                                 void *cb_opaque, void *opaque)
    189{
    190    return timer_new_full(NULL, QEMU_CLOCK_VIRTUAL,
    191                          SCALE_MS, QEMU_TIMER_ATTR_EXTERNAL,
    192                          cb, cb_opaque);
    193}
    194
    195static void net_slirp_timer_free(void *timer, void *opaque)
    196{
    197    timer_free(timer);
    198}
    199
    200static void net_slirp_timer_mod(void *timer, int64_t expire_timer,
    201                                void *opaque)
    202{
    203    timer_mod(timer, expire_timer);
    204}
    205
    206static void net_slirp_register_poll_fd(int fd, void *opaque)
    207{
    208    qemu_fd_register(fd);
    209}
    210
    211static void net_slirp_unregister_poll_fd(int fd, void *opaque)
    212{
    213    /* no qemu_fd_unregister */
    214}
    215
    216static void net_slirp_notify(void *opaque)
    217{
    218    qemu_notify_event();
    219}
    220
    221static const SlirpCb slirp_cb = {
    222    .send_packet = net_slirp_send_packet,
    223    .guest_error = net_slirp_guest_error,
    224    .clock_get_ns = net_slirp_clock_get_ns,
    225    .timer_new = net_slirp_timer_new,
    226    .timer_free = net_slirp_timer_free,
    227    .timer_mod = net_slirp_timer_mod,
    228    .register_poll_fd = net_slirp_register_poll_fd,
    229    .unregister_poll_fd = net_slirp_unregister_poll_fd,
    230    .notify = net_slirp_notify,
    231};
    232
    233static int slirp_poll_to_gio(int events)
    234{
    235    int ret = 0;
    236
    237    if (events & SLIRP_POLL_IN) {
    238        ret |= G_IO_IN;
    239    }
    240    if (events & SLIRP_POLL_OUT) {
    241        ret |= G_IO_OUT;
    242    }
    243    if (events & SLIRP_POLL_PRI) {
    244        ret |= G_IO_PRI;
    245    }
    246    if (events & SLIRP_POLL_ERR) {
    247        ret |= G_IO_ERR;
    248    }
    249    if (events & SLIRP_POLL_HUP) {
    250        ret |= G_IO_HUP;
    251    }
    252
    253    return ret;
    254}
    255
    256static int net_slirp_add_poll(int fd, int events, void *opaque)
    257{
    258    GArray *pollfds = opaque;
    259    GPollFD pfd = {
    260        .fd = fd,
    261        .events = slirp_poll_to_gio(events),
    262    };
    263    int idx = pollfds->len;
    264    g_array_append_val(pollfds, pfd);
    265    return idx;
    266}
    267
    268static int slirp_gio_to_poll(int events)
    269{
    270    int ret = 0;
    271
    272    if (events & G_IO_IN) {
    273        ret |= SLIRP_POLL_IN;
    274    }
    275    if (events & G_IO_OUT) {
    276        ret |= SLIRP_POLL_OUT;
    277    }
    278    if (events & G_IO_PRI) {
    279        ret |= SLIRP_POLL_PRI;
    280    }
    281    if (events & G_IO_ERR) {
    282        ret |= SLIRP_POLL_ERR;
    283    }
    284    if (events & G_IO_HUP) {
    285        ret |= SLIRP_POLL_HUP;
    286    }
    287
    288    return ret;
    289}
    290
    291static int net_slirp_get_revents(int idx, void *opaque)
    292{
    293    GArray *pollfds = opaque;
    294
    295    return slirp_gio_to_poll(g_array_index(pollfds, GPollFD, idx).revents);
    296}
    297
    298static void net_slirp_poll_notify(Notifier *notifier, void *data)
    299{
    300    MainLoopPoll *poll = data;
    301    SlirpState *s = container_of(notifier, SlirpState, poll_notifier);
    302
    303    switch (poll->state) {
    304    case MAIN_LOOP_POLL_FILL:
    305        slirp_pollfds_fill(s->slirp, &poll->timeout,
    306                           net_slirp_add_poll, poll->pollfds);
    307        break;
    308    case MAIN_LOOP_POLL_OK:
    309    case MAIN_LOOP_POLL_ERR:
    310        slirp_pollfds_poll(s->slirp, poll->state == MAIN_LOOP_POLL_ERR,
    311                           net_slirp_get_revents, poll->pollfds);
    312        break;
    313    default:
    314        g_assert_not_reached();
    315    }
    316}
    317
    318static ssize_t
    319net_slirp_stream_read(void *buf, size_t size, void *opaque)
    320{
    321    QEMUFile *f = opaque;
    322
    323    return qemu_get_buffer(f, buf, size);
    324}
    325
    326static ssize_t
    327net_slirp_stream_write(const void *buf, size_t size, void *opaque)
    328{
    329    QEMUFile *f = opaque;
    330
    331    qemu_put_buffer(f, buf, size);
    332    if (qemu_file_get_error(f)) {
    333        return -1;
    334    }
    335
    336    return size;
    337}
    338
    339static int net_slirp_state_load(QEMUFile *f, void *opaque, int version_id)
    340{
    341    Slirp *slirp = opaque;
    342
    343    return slirp_state_load(slirp, version_id, net_slirp_stream_read, f);
    344}
    345
    346static void net_slirp_state_save(QEMUFile *f, void *opaque)
    347{
    348    Slirp *slirp = opaque;
    349
    350    slirp_state_save(slirp, net_slirp_stream_write, f);
    351}
    352
    353static SaveVMHandlers savevm_slirp_state = {
    354    .save_state = net_slirp_state_save,
    355    .load_state = net_slirp_state_load,
    356};
    357
    358static int net_slirp_init(NetClientState *peer, const char *model,
    359                          const char *name, int restricted,
    360                          bool ipv4, const char *vnetwork, const char *vhost,
    361                          bool ipv6, const char *vprefix6, int vprefix6_len,
    362                          const char *vhost6,
    363                          const char *vhostname, const char *tftp_export,
    364                          const char *bootfile, const char *vdhcp_start,
    365                          const char *vnameserver, const char *vnameserver6,
    366                          const char *smb_export, const char *vsmbserver,
    367                          const char **dnssearch, const char *vdomainname,
    368                          const char *tftp_server_name,
    369                          Error **errp)
    370{
    371    /* default settings according to historic slirp */
    372    struct in_addr net  = { .s_addr = htonl(0x0a000200) }; /* 10.0.2.0 */
    373    struct in_addr mask = { .s_addr = htonl(0xffffff00) }; /* 255.255.255.0 */
    374    struct in_addr host = { .s_addr = htonl(0x0a000202) }; /* 10.0.2.2 */
    375    struct in_addr dhcp = { .s_addr = htonl(0x0a00020f) }; /* 10.0.2.15 */
    376    struct in_addr dns  = { .s_addr = htonl(0x0a000203) }; /* 10.0.2.3 */
    377    struct in6_addr ip6_prefix;
    378    struct in6_addr ip6_host;
    379    struct in6_addr ip6_dns;
    380#if defined(CONFIG_SLIRP_SMBD)
    381    struct in_addr smbsrv = { .s_addr = 0 };
    382#endif
    383    NetClientState *nc;
    384    SlirpState *s;
    385    char buf[20];
    386    uint32_t addr;
    387    int shift;
    388    char *end;
    389    struct slirp_config_str *config;
    390
    391    if (!ipv4 && (vnetwork || vhost || vnameserver)) {
    392        error_setg(errp, "IPv4 disabled but netmask/host/dns provided");
    393        return -1;
    394    }
    395
    396    if (!ipv6 && (vprefix6 || vhost6 || vnameserver6)) {
    397        error_setg(errp, "IPv6 disabled but prefix/host6/dns6 provided");
    398        return -1;
    399    }
    400
    401    if (!ipv4 && !ipv6) {
    402        /* It doesn't make sense to disable both */
    403        error_setg(errp, "IPv4 and IPv6 disabled");
    404        return -1;
    405    }
    406
    407    if (vnetwork) {
    408        if (get_str_sep(buf, sizeof(buf), &vnetwork, '/') < 0) {
    409            if (!inet_aton(vnetwork, &net)) {
    410                error_setg(errp, "Failed to parse netmask");
    411                return -1;
    412            }
    413            addr = ntohl(net.s_addr);
    414            if (!(addr & 0x80000000)) {
    415                mask.s_addr = htonl(0xff000000); /* class A */
    416            } else if ((addr & 0xfff00000) == 0xac100000) {
    417                mask.s_addr = htonl(0xfff00000); /* priv. 172.16.0.0/12 */
    418            } else if ((addr & 0xc0000000) == 0x80000000) {
    419                mask.s_addr = htonl(0xffff0000); /* class B */
    420            } else if ((addr & 0xffff0000) == 0xc0a80000) {
    421                mask.s_addr = htonl(0xffff0000); /* priv. 192.168.0.0/16 */
    422            } else if ((addr & 0xffff0000) == 0xc6120000) {
    423                mask.s_addr = htonl(0xfffe0000); /* tests 198.18.0.0/15 */
    424            } else if ((addr & 0xe0000000) == 0xe0000000) {
    425                mask.s_addr = htonl(0xffffff00); /* class C */
    426            } else {
    427                mask.s_addr = htonl(0xfffffff0); /* multicast/reserved */
    428            }
    429        } else {
    430            if (!inet_aton(buf, &net)) {
    431                error_setg(errp, "Failed to parse netmask");
    432                return -1;
    433            }
    434            shift = strtol(vnetwork, &end, 10);
    435            if (*end != '\0') {
    436                if (!inet_aton(vnetwork, &mask)) {
    437                    error_setg(errp,
    438                               "Failed to parse netmask (trailing chars)");
    439                    return -1;
    440                }
    441            } else if (shift < 4 || shift > 32) {
    442                error_setg(errp,
    443                           "Invalid netmask provided (must be in range 4-32)");
    444                return -1;
    445            } else {
    446                mask.s_addr = htonl(0xffffffff << (32 - shift));
    447            }
    448        }
    449        net.s_addr &= mask.s_addr;
    450        host.s_addr = net.s_addr | (htonl(0x0202) & ~mask.s_addr);
    451        dhcp.s_addr = net.s_addr | (htonl(0x020f) & ~mask.s_addr);
    452        dns.s_addr  = net.s_addr | (htonl(0x0203) & ~mask.s_addr);
    453    }
    454
    455    if (vhost && !inet_aton(vhost, &host)) {
    456        error_setg(errp, "Failed to parse host");
    457        return -1;
    458    }
    459    if ((host.s_addr & mask.s_addr) != net.s_addr) {
    460        error_setg(errp, "Host doesn't belong to network");
    461        return -1;
    462    }
    463
    464    if (vnameserver && !inet_aton(vnameserver, &dns)) {
    465        error_setg(errp, "Failed to parse DNS");
    466        return -1;
    467    }
    468    if (restricted && (dns.s_addr & mask.s_addr) != net.s_addr) {
    469        error_setg(errp, "DNS doesn't belong to network");
    470        return -1;
    471    }
    472    if (dns.s_addr == host.s_addr) {
    473        error_setg(errp, "DNS must be different from host");
    474        return -1;
    475    }
    476
    477    if (vdhcp_start && !inet_aton(vdhcp_start, &dhcp)) {
    478        error_setg(errp, "Failed to parse DHCP start address");
    479        return -1;
    480    }
    481    if ((dhcp.s_addr & mask.s_addr) != net.s_addr) {
    482        error_setg(errp, "DHCP doesn't belong to network");
    483        return -1;
    484    }
    485    if (dhcp.s_addr == host.s_addr || dhcp.s_addr == dns.s_addr) {
    486        error_setg(errp, "DHCP must be different from host and DNS");
    487        return -1;
    488    }
    489
    490#if defined(CONFIG_SLIRP_SMBD)
    491    if (vsmbserver && !inet_aton(vsmbserver, &smbsrv)) {
    492        error_setg(errp, "Failed to parse SMB address");
    493        return -1;
    494    }
    495#endif
    496
    497    if (!vprefix6) {
    498        vprefix6 = "fec0::";
    499    }
    500    if (!inet_pton(AF_INET6, vprefix6, &ip6_prefix)) {
    501        error_setg(errp, "Failed to parse IPv6 prefix");
    502        return -1;
    503    }
    504
    505    if (!vprefix6_len) {
    506        vprefix6_len = 64;
    507    }
    508    if (vprefix6_len < 0 || vprefix6_len > 126) {
    509        error_setg(errp,
    510                   "Invalid IPv6 prefix provided "
    511                   "(IPv6 prefix length must be between 0 and 126)");
    512        return -1;
    513    }
    514
    515    if (vhost6) {
    516        if (!inet_pton(AF_INET6, vhost6, &ip6_host)) {
    517            error_setg(errp, "Failed to parse IPv6 host");
    518            return -1;
    519        }
    520        if (!in6_equal_net(&ip6_prefix, &ip6_host, vprefix6_len)) {
    521            error_setg(errp, "IPv6 Host doesn't belong to network");
    522            return -1;
    523        }
    524    } else {
    525        ip6_host = ip6_prefix;
    526        ip6_host.s6_addr[15] |= 2;
    527    }
    528
    529    if (vnameserver6) {
    530        if (!inet_pton(AF_INET6, vnameserver6, &ip6_dns)) {
    531            error_setg(errp, "Failed to parse IPv6 DNS");
    532            return -1;
    533        }
    534        if (restricted && !in6_equal_net(&ip6_prefix, &ip6_dns, vprefix6_len)) {
    535            error_setg(errp, "IPv6 DNS doesn't belong to network");
    536            return -1;
    537        }
    538    } else {
    539        ip6_dns = ip6_prefix;
    540        ip6_dns.s6_addr[15] |= 3;
    541    }
    542
    543    if (vdomainname && !*vdomainname) {
    544        error_setg(errp, "'domainname' parameter cannot be empty");
    545        return -1;
    546    }
    547
    548    if (vdomainname && strlen(vdomainname) > 255) {
    549        error_setg(errp, "'domainname' parameter cannot exceed 255 bytes");
    550        return -1;
    551    }
    552
    553    if (vhostname && strlen(vhostname) > 255) {
    554        error_setg(errp, "'vhostname' parameter cannot exceed 255 bytes");
    555        return -1;
    556    }
    557
    558    if (tftp_server_name && strlen(tftp_server_name) > 255) {
    559        error_setg(errp, "'tftp-server-name' parameter cannot exceed 255 bytes");
    560        return -1;
    561    }
    562
    563    nc = qemu_new_net_client(&net_slirp_info, peer, model, name);
    564
    565    snprintf(nc->info_str, sizeof(nc->info_str),
    566             "net=%s,restrict=%s", inet_ntoa(net),
    567             restricted ? "on" : "off");
    568
    569    s = DO_UPCAST(SlirpState, nc, nc);
    570
    571    s->slirp = slirp_init(restricted, ipv4, net, mask, host,
    572                          ipv6, ip6_prefix, vprefix6_len, ip6_host,
    573                          vhostname, tftp_server_name,
    574                          tftp_export, bootfile, dhcp,
    575                          dns, ip6_dns, dnssearch, vdomainname,
    576                          &slirp_cb, s);
    577    QTAILQ_INSERT_TAIL(&slirp_stacks, s, entry);
    578
    579    /*
    580     * Make sure the current bitstream version of slirp is 4, to avoid
    581     * QEMU migration incompatibilities, if upstream slirp bumped the
    582     * version.
    583     *
    584     * FIXME: use bitfields of features? teach libslirp to save with
    585     * specific version?
    586     */
    587    g_assert(slirp_state_version() == 4);
    588    register_savevm_live("slirp", 0, slirp_state_version(),
    589                         &savevm_slirp_state, s->slirp);
    590
    591    s->poll_notifier.notify = net_slirp_poll_notify;
    592    main_loop_poll_add_notifier(&s->poll_notifier);
    593
    594    for (config = slirp_configs; config; config = config->next) {
    595        if (config->flags & SLIRP_CFG_HOSTFWD) {
    596            if (slirp_hostfwd(s, config->str, errp) < 0) {
    597                goto error;
    598            }
    599        } else {
    600            if (slirp_guestfwd(s, config->str, errp) < 0) {
    601                goto error;
    602            }
    603        }
    604    }
    605#if defined(CONFIG_SLIRP_SMBD)
    606    if (smb_export) {
    607        if (slirp_smb(s, smb_export, smbsrv, errp) < 0) {
    608            goto error;
    609        }
    610    }
    611#endif
    612
    613    s->exit_notifier.notify = slirp_smb_exit;
    614    qemu_add_exit_notifier(&s->exit_notifier);
    615    return 0;
    616
    617error:
    618    qemu_del_net_client(nc);
    619    return -1;
    620}
    621
    622static SlirpState *slirp_lookup(Monitor *mon, const char *id)
    623{
    624    if (id) {
    625        NetClientState *nc = qemu_find_netdev(id);
    626        if (!nc) {
    627            monitor_printf(mon, "unrecognized netdev id '%s'\n", id);
    628            return NULL;
    629        }
    630        if (strcmp(nc->model, "user")) {
    631            monitor_printf(mon, "invalid device specified\n");
    632            return NULL;
    633        }
    634        return DO_UPCAST(SlirpState, nc, nc);
    635    } else {
    636        if (QTAILQ_EMPTY(&slirp_stacks)) {
    637            monitor_printf(mon, "user mode network stack not in use\n");
    638            return NULL;
    639        }
    640        return QTAILQ_FIRST(&slirp_stacks);
    641    }
    642}
    643
    644void hmp_hostfwd_remove(Monitor *mon, const QDict *qdict)
    645{
    646    struct in_addr host_addr = { .s_addr = INADDR_ANY };
    647    int host_port;
    648    char buf[256];
    649    const char *src_str, *p;
    650    SlirpState *s;
    651    int is_udp = 0;
    652    int err;
    653    const char *arg1 = qdict_get_str(qdict, "arg1");
    654    const char *arg2 = qdict_get_try_str(qdict, "arg2");
    655
    656    if (arg2) {
    657        s = slirp_lookup(mon, arg1);
    658        src_str = arg2;
    659    } else {
    660        s = slirp_lookup(mon, NULL);
    661        src_str = arg1;
    662    }
    663    if (!s) {
    664        return;
    665    }
    666
    667    p = src_str;
    668    if (!p || get_str_sep(buf, sizeof(buf), &p, ':') < 0) {
    669        goto fail_syntax;
    670    }
    671
    672    if (!strcmp(buf, "tcp") || buf[0] == '\0') {
    673        is_udp = 0;
    674    } else if (!strcmp(buf, "udp")) {
    675        is_udp = 1;
    676    } else {
    677        goto fail_syntax;
    678    }
    679
    680    if (get_str_sep(buf, sizeof(buf), &p, ':') < 0) {
    681        goto fail_syntax;
    682    }
    683    if (buf[0] != '\0' && !inet_aton(buf, &host_addr)) {
    684        goto fail_syntax;
    685    }
    686
    687    if (qemu_strtoi(p, NULL, 10, &host_port)) {
    688        goto fail_syntax;
    689    }
    690
    691    err = slirp_remove_hostfwd(s->slirp, is_udp, host_addr, host_port);
    692
    693    monitor_printf(mon, "host forwarding rule for %s %s\n", src_str,
    694                   err ? "not found" : "removed");
    695    return;
    696
    697 fail_syntax:
    698    monitor_printf(mon, "invalid format\n");
    699}
    700
    701static int slirp_hostfwd(SlirpState *s, const char *redir_str, Error **errp)
    702{
    703    struct in_addr host_addr = { .s_addr = INADDR_ANY };
    704    struct in_addr guest_addr = { .s_addr = 0 };
    705    int host_port, guest_port;
    706    const char *p;
    707    char buf[256];
    708    int is_udp;
    709    char *end;
    710    const char *fail_reason = "Unknown reason";
    711
    712    p = redir_str;
    713    if (!p || get_str_sep(buf, sizeof(buf), &p, ':') < 0) {
    714        fail_reason = "No : separators";
    715        goto fail_syntax;
    716    }
    717    if (!strcmp(buf, "tcp") || buf[0] == '\0') {
    718        is_udp = 0;
    719    } else if (!strcmp(buf, "udp")) {
    720        is_udp = 1;
    721    } else {
    722        fail_reason = "Bad protocol name";
    723        goto fail_syntax;
    724    }
    725
    726    if (get_str_sep(buf, sizeof(buf), &p, ':') < 0) {
    727        fail_reason = "Missing : separator";
    728        goto fail_syntax;
    729    }
    730    if (buf[0] != '\0' && !inet_aton(buf, &host_addr)) {
    731        fail_reason = "Bad host address";
    732        goto fail_syntax;
    733    }
    734
    735    if (get_str_sep(buf, sizeof(buf), &p, '-') < 0) {
    736        fail_reason = "Bad host port separator";
    737        goto fail_syntax;
    738    }
    739    host_port = strtol(buf, &end, 0);
    740    if (*end != '\0' || host_port < 0 || host_port > 65535) {
    741        fail_reason = "Bad host port";
    742        goto fail_syntax;
    743    }
    744
    745    if (get_str_sep(buf, sizeof(buf), &p, ':') < 0) {
    746        fail_reason = "Missing guest address";
    747        goto fail_syntax;
    748    }
    749    if (buf[0] != '\0' && !inet_aton(buf, &guest_addr)) {
    750        fail_reason = "Bad guest address";
    751        goto fail_syntax;
    752    }
    753
    754    guest_port = strtol(p, &end, 0);
    755    if (*end != '\0' || guest_port < 1 || guest_port > 65535) {
    756        fail_reason = "Bad guest port";
    757        goto fail_syntax;
    758    }
    759
    760    if (slirp_add_hostfwd(s->slirp, is_udp, host_addr, host_port, guest_addr,
    761                          guest_port) < 0) {
    762        error_setg(errp, "Could not set up host forwarding rule '%s'",
    763                   redir_str);
    764        return -1;
    765    }
    766    return 0;
    767
    768 fail_syntax:
    769    error_setg(errp, "Invalid host forwarding rule '%s' (%s)", redir_str,
    770               fail_reason);
    771    return -1;
    772}
    773
    774void hmp_hostfwd_add(Monitor *mon, const QDict *qdict)
    775{
    776    const char *redir_str;
    777    SlirpState *s;
    778    const char *arg1 = qdict_get_str(qdict, "arg1");
    779    const char *arg2 = qdict_get_try_str(qdict, "arg2");
    780
    781    if (arg2) {
    782        s = slirp_lookup(mon, arg1);
    783        redir_str = arg2;
    784    } else {
    785        s = slirp_lookup(mon, NULL);
    786        redir_str = arg1;
    787    }
    788    if (s) {
    789        Error *err = NULL;
    790        if (slirp_hostfwd(s, redir_str, &err) < 0) {
    791            error_report_err(err);
    792        }
    793    }
    794
    795}
    796
    797#if defined(CONFIG_SLIRP_SMBD)
    798
    799/* automatic user mode samba server configuration */
    800static void slirp_smb_cleanup(SlirpState *s)
    801{
    802    int ret;
    803
    804    if (s->smb_dir) {
    805        gchar *cmd = g_strdup_printf("rm -rf %s", s->smb_dir);
    806        ret = system(cmd);
    807        if (ret == -1 || !WIFEXITED(ret)) {
    808            error_report("'%s' failed.", cmd);
    809        } else if (WEXITSTATUS(ret)) {
    810            error_report("'%s' failed. Error code: %d",
    811                         cmd, WEXITSTATUS(ret));
    812        }
    813        g_free(cmd);
    814        g_free(s->smb_dir);
    815        s->smb_dir = NULL;
    816    }
    817}
    818
    819static int slirp_smb(SlirpState* s, const char *exported_dir,
    820                     struct in_addr vserver_addr, Error **errp)
    821{
    822    char *smb_conf;
    823    char *smb_cmdline;
    824    struct passwd *passwd;
    825    FILE *f;
    826
    827    passwd = getpwuid(geteuid());
    828    if (!passwd) {
    829        error_setg(errp, "Failed to retrieve user name");
    830        return -1;
    831    }
    832
    833    if (access(CONFIG_SMBD_COMMAND, F_OK)) {
    834        error_setg(errp, "Could not find '%s', please install it",
    835                   CONFIG_SMBD_COMMAND);
    836        return -1;
    837    }
    838
    839    if (access(exported_dir, R_OK | X_OK)) {
    840        error_setg(errp, "Error accessing shared directory '%s': %s",
    841                   exported_dir, strerror(errno));
    842        return -1;
    843    }
    844
    845    s->smb_dir = g_dir_make_tmp("qemu-smb.XXXXXX", NULL);
    846    if (!s->smb_dir) {
    847        error_setg(errp, "Could not create samba server dir");
    848        return -1;
    849    }
    850    smb_conf = g_strdup_printf("%s/%s", s->smb_dir, "smb.conf");
    851
    852    f = fopen(smb_conf, "w");
    853    if (!f) {
    854        slirp_smb_cleanup(s);
    855        error_setg(errp,
    856                   "Could not create samba server configuration file '%s'",
    857                    smb_conf);
    858        g_free(smb_conf);
    859        return -1;
    860    }
    861    fprintf(f,
    862            "[global]\n"
    863            "private dir=%s\n"
    864            "interfaces=127.0.0.1\n"
    865            "bind interfaces only=yes\n"
    866            "pid directory=%s\n"
    867            "lock directory=%s\n"
    868            "state directory=%s\n"
    869            "cache directory=%s\n"
    870            "ncalrpc dir=%s/ncalrpc\n"
    871            "log file=%s/log.smbd\n"
    872            "smb passwd file=%s/smbpasswd\n"
    873            "security = user\n"
    874            "map to guest = Bad User\n"
    875            "load printers = no\n"
    876            "printing = bsd\n"
    877            "disable spoolss = yes\n"
    878            "usershare max shares = 0\n"
    879            "[qemu]\n"
    880            "path=%s\n"
    881            "read only=no\n"
    882            "guest ok=yes\n"
    883            "force user=%s\n",
    884            s->smb_dir,
    885            s->smb_dir,
    886            s->smb_dir,
    887            s->smb_dir,
    888            s->smb_dir,
    889            s->smb_dir,
    890            s->smb_dir,
    891            s->smb_dir,
    892            exported_dir,
    893            passwd->pw_name
    894            );
    895    fclose(f);
    896
    897    smb_cmdline = g_strdup_printf("%s -l %s -s %s",
    898             CONFIG_SMBD_COMMAND, s->smb_dir, smb_conf);
    899    g_free(smb_conf);
    900
    901    if (slirp_add_exec(s->slirp, smb_cmdline, &vserver_addr, 139) < 0 ||
    902        slirp_add_exec(s->slirp, smb_cmdline, &vserver_addr, 445) < 0) {
    903        slirp_smb_cleanup(s);
    904        g_free(smb_cmdline);
    905        error_setg(errp, "Conflicting/invalid smbserver address");
    906        return -1;
    907    }
    908    g_free(smb_cmdline);
    909    return 0;
    910}
    911
    912#endif /* defined(CONFIG_SLIRP_SMBD) */
    913
    914static int guestfwd_can_read(void *opaque)
    915{
    916    struct GuestFwd *fwd = opaque;
    917    return slirp_socket_can_recv(fwd->slirp, fwd->server, fwd->port);
    918}
    919
    920static void guestfwd_read(void *opaque, const uint8_t *buf, int size)
    921{
    922    struct GuestFwd *fwd = opaque;
    923    slirp_socket_recv(fwd->slirp, fwd->server, fwd->port, buf, size);
    924}
    925
    926static ssize_t guestfwd_write(const void *buf, size_t len, void *chr)
    927{
    928    return qemu_chr_fe_write_all(chr, buf, len);
    929}
    930
    931static int slirp_guestfwd(SlirpState *s, const char *config_str, Error **errp)
    932{
    933    /* TODO: IPv6 */
    934    struct in_addr server = { .s_addr = 0 };
    935    struct GuestFwd *fwd;
    936    const char *p;
    937    char buf[128];
    938    char *end;
    939    int port;
    940
    941    p = config_str;
    942    if (get_str_sep(buf, sizeof(buf), &p, ':') < 0) {
    943        goto fail_syntax;
    944    }
    945    if (strcmp(buf, "tcp") && buf[0] != '\0') {
    946        goto fail_syntax;
    947    }
    948    if (get_str_sep(buf, sizeof(buf), &p, ':') < 0) {
    949        goto fail_syntax;
    950    }
    951    if (buf[0] != '\0' && !inet_aton(buf, &server)) {
    952        goto fail_syntax;
    953    }
    954    if (get_str_sep(buf, sizeof(buf), &p, '-') < 0) {
    955        goto fail_syntax;
    956    }
    957    port = strtol(buf, &end, 10);
    958    if (*end != '\0' || port < 1 || port > 65535) {
    959        goto fail_syntax;
    960    }
    961
    962    snprintf(buf, sizeof(buf), "guestfwd.tcp.%d", port);
    963
    964    if (g_str_has_prefix(p, "cmd:")) {
    965        if (slirp_add_exec(s->slirp, &p[4], &server, port) < 0) {
    966            error_setg(errp, "Conflicting/invalid host:port in guest "
    967                       "forwarding rule '%s'", config_str);
    968            return -1;
    969        }
    970    } else {
    971        Error *err = NULL;
    972        /*
    973         * FIXME: sure we want to support implicit
    974         * muxed monitors here?
    975         */
    976        Chardev *chr = qemu_chr_new_mux_mon(buf, p, NULL);
    977
    978        if (!chr) {
    979            error_setg(errp, "Could not open guest forwarding device '%s'",
    980                       buf);
    981            return -1;
    982        }
    983
    984        fwd = g_new(struct GuestFwd, 1);
    985        qemu_chr_fe_init(&fwd->hd, chr, &err);
    986        if (err) {
    987            error_propagate(errp, err);
    988            object_unparent(OBJECT(chr));
    989            g_free(fwd);
    990            return -1;
    991        }
    992
    993        if (slirp_add_guestfwd(s->slirp, guestfwd_write, &fwd->hd,
    994                               &server, port) < 0) {
    995            error_setg(errp, "Conflicting/invalid host:port in guest "
    996                       "forwarding rule '%s'", config_str);
    997            qemu_chr_fe_deinit(&fwd->hd, true);
    998            g_free(fwd);
    999            return -1;
   1000        }
   1001        fwd->server = server;
   1002        fwd->port = port;
   1003        fwd->slirp = s->slirp;
   1004
   1005        qemu_chr_fe_set_handlers(&fwd->hd, guestfwd_can_read, guestfwd_read,
   1006                                 NULL, NULL, fwd, NULL, true);
   1007        s->fwd = g_slist_append(s->fwd, fwd);
   1008    }
   1009    return 0;
   1010
   1011 fail_syntax:
   1012    error_setg(errp, "Invalid guest forwarding rule '%s'", config_str);
   1013    return -1;
   1014}
   1015
   1016void hmp_info_usernet(Monitor *mon, const QDict *qdict)
   1017{
   1018    SlirpState *s;
   1019
   1020    QTAILQ_FOREACH(s, &slirp_stacks, entry) {
   1021        int id;
   1022        bool got_hub_id = net_hub_id_for_client(&s->nc, &id) == 0;
   1023        char *info = slirp_connection_info(s->slirp);
   1024        monitor_printf(mon, "Hub %d (%s):\n%s",
   1025                       got_hub_id ? id : -1,
   1026                       s->nc.name, info);
   1027        g_free(info);
   1028    }
   1029}
   1030
   1031static void
   1032net_init_slirp_configs(const StringList *fwd, int flags)
   1033{
   1034    while (fwd) {
   1035        struct slirp_config_str *config;
   1036
   1037        config = g_malloc0(sizeof(*config));
   1038        pstrcpy(config->str, sizeof(config->str), fwd->value->str);
   1039        config->flags = flags;
   1040        config->next = slirp_configs;
   1041        slirp_configs = config;
   1042
   1043        fwd = fwd->next;
   1044    }
   1045}
   1046
   1047static const char **slirp_dnssearch(const StringList *dnsname)
   1048{
   1049    const StringList *c = dnsname;
   1050    size_t i = 0, num_opts = 0;
   1051    const char **ret;
   1052
   1053    while (c) {
   1054        num_opts++;
   1055        c = c->next;
   1056    }
   1057
   1058    if (num_opts == 0) {
   1059        return NULL;
   1060    }
   1061
   1062    ret = g_malloc((num_opts + 1) * sizeof(*ret));
   1063    c = dnsname;
   1064    while (c) {
   1065        ret[i++] = c->value->str;
   1066        c = c->next;
   1067    }
   1068    ret[i] = NULL;
   1069    return ret;
   1070}
   1071
   1072int net_init_slirp(const Netdev *netdev, const char *name,
   1073                   NetClientState *peer, Error **errp)
   1074{
   1075    struct slirp_config_str *config;
   1076    char *vnet;
   1077    int ret;
   1078    const NetdevUserOptions *user;
   1079    const char **dnssearch;
   1080    bool ipv4 = true, ipv6 = true;
   1081
   1082    assert(netdev->type == NET_CLIENT_DRIVER_USER);
   1083    user = &netdev->u.user;
   1084
   1085    if ((user->has_ipv6 && user->ipv6 && !user->has_ipv4) ||
   1086        (user->has_ipv4 && !user->ipv4)) {
   1087        ipv4 = 0;
   1088    }
   1089    if ((user->has_ipv4 && user->ipv4 && !user->has_ipv6) ||
   1090        (user->has_ipv6 && !user->ipv6)) {
   1091        ipv6 = 0;
   1092    }
   1093
   1094    vnet = user->has_net ? g_strdup(user->net) :
   1095           user->has_ip  ? g_strdup_printf("%s/24", user->ip) :
   1096           NULL;
   1097
   1098    dnssearch = slirp_dnssearch(user->dnssearch);
   1099
   1100    /* all optional fields are initialized to "all bits zero" */
   1101
   1102    net_init_slirp_configs(user->hostfwd, SLIRP_CFG_HOSTFWD);
   1103    net_init_slirp_configs(user->guestfwd, 0);
   1104
   1105    ret = net_slirp_init(peer, "user", name, user->q_restrict,
   1106                         ipv4, vnet, user->host,
   1107                         ipv6, user->ipv6_prefix, user->ipv6_prefixlen,
   1108                         user->ipv6_host, user->hostname, user->tftp,
   1109                         user->bootfile, user->dhcpstart,
   1110                         user->dns, user->ipv6_dns, user->smb,
   1111                         user->smbserver, dnssearch, user->domainname,
   1112                         user->tftp_server_name, errp);
   1113
   1114    while (slirp_configs) {
   1115        config = slirp_configs;
   1116        slirp_configs = config->next;
   1117        g_free(config);
   1118    }
   1119
   1120    g_free(vnet);
   1121    g_free(dnssearch);
   1122
   1123    return ret;
   1124}