/* * QEMU System Emulator * * Copyright (c) 2003-2008 Fabrice Bellard * * Permission is hereby granted, free of charge, to any person obtaining a copy * of this software and associated documentation files (the "Software"), to deal * in the Software without restriction, including without limitation the rights * to use, copy, modify, merge, publish, distribute, sublicense, and/or sell * copies of the Software, and to permit persons to whom the Software is * furnished to do so, subject to the following conditions: * * The above copyright notice and this permission notice shall be included in * all copies or substantial portions of the Software. * * THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR * IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY, * FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL * THE AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER * LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM, * OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN * THE SOFTWARE. */ #include "qemu/osdep.h" #include "qemu/log.h" #include "net/slirp.h" #ifndef _WIN32 #include #include #endif #include "net/eth.h" #include "net/net.h" #include "clients.h" #include "hub.h" #include "monitor/monitor.h" #include "qemu/error-report.h" #include "qemu/sockets.h" #include #include "chardev/char-fe.h" #include "sysemu/sysemu.h" #include "qemu/cutils.h" #include "qapi/error.h" #include "qapi/qmp/qdict.h" #include "util.h" #include "migration/register.h" #include "migration/qemu-file-types.h" static int get_str_sep(char *buf, int buf_size, const char **pp, int sep) { const char *p, *p1; int len; p = *pp; p1 = strchr(p, sep); if (!p1) return -1; len = p1 - p; p1++; if (buf_size > 0) { if (len > buf_size - 1) len = buf_size - 1; memcpy(buf, p, len); buf[len] = '\0'; } *pp = p1; return 0; } /* slirp network adapter */ #define SLIRP_CFG_HOSTFWD 1 struct slirp_config_str { struct slirp_config_str *next; int flags; char str[1024]; }; struct GuestFwd { CharBackend hd; struct in_addr server; int port; Slirp *slirp; }; typedef struct SlirpState { NetClientState nc; QTAILQ_ENTRY(SlirpState) entry; Slirp *slirp; Notifier poll_notifier; Notifier exit_notifier; #ifndef _WIN32 gchar *smb_dir; #endif GSList *fwd; } SlirpState; static struct slirp_config_str *slirp_configs; static QTAILQ_HEAD(, SlirpState) slirp_stacks = QTAILQ_HEAD_INITIALIZER(slirp_stacks); static int slirp_hostfwd(SlirpState *s, const char *redir_str, Error **errp); static int slirp_guestfwd(SlirpState *s, const char *config_str, Error **errp); #ifndef _WIN32 static int slirp_smb(SlirpState *s, const char *exported_dir, struct in_addr vserver_addr, Error **errp); static void slirp_smb_cleanup(SlirpState *s); #else static inline void slirp_smb_cleanup(SlirpState *s) { } #endif static ssize_t net_slirp_send_packet(const void *pkt, size_t pkt_len, void *opaque) { SlirpState *s = opaque; uint8_t min_pkt[ETH_ZLEN]; size_t min_pktsz = sizeof(min_pkt); if (!s->nc.peer->do_not_pad) { if (eth_pad_short_frame(min_pkt, &min_pktsz, pkt, pkt_len)) { pkt = min_pkt; pkt_len = min_pktsz; } } return qemu_send_packet(&s->nc, pkt, pkt_len); } static ssize_t net_slirp_receive(NetClientState *nc, const uint8_t *buf, size_t size) { SlirpState *s = DO_UPCAST(SlirpState, nc, nc); slirp_input(s->slirp, buf, size); return size; } static void slirp_smb_exit(Notifier *n, void *data) { SlirpState *s = container_of(n, SlirpState, exit_notifier); slirp_smb_cleanup(s); } static void slirp_free_fwd(gpointer data) { struct GuestFwd *fwd = data; qemu_chr_fe_deinit(&fwd->hd, true); g_free(data); } static void net_slirp_cleanup(NetClientState *nc) { SlirpState *s = DO_UPCAST(SlirpState, nc, nc); g_slist_free_full(s->fwd, slirp_free_fwd); main_loop_poll_remove_notifier(&s->poll_notifier); unregister_savevm(NULL, "slirp", s->slirp); slirp_cleanup(s->slirp); if (s->exit_notifier.notify) { qemu_remove_exit_notifier(&s->exit_notifier); } slirp_smb_cleanup(s); QTAILQ_REMOVE(&slirp_stacks, s, entry); } static NetClientInfo net_slirp_info = { .type = NET_CLIENT_DRIVER_USER, .size = sizeof(SlirpState), .receive = net_slirp_receive, .cleanup = net_slirp_cleanup, }; static void net_slirp_guest_error(const char *msg, void *opaque) { qemu_log_mask(LOG_GUEST_ERROR, "%s", msg); } static int64_t net_slirp_clock_get_ns(void *opaque) { return qemu_clock_get_ns(QEMU_CLOCK_VIRTUAL); } static void *net_slirp_timer_new(SlirpTimerCb cb, void *cb_opaque, void *opaque) { return timer_new_full(NULL, QEMU_CLOCK_VIRTUAL, SCALE_MS, QEMU_TIMER_ATTR_EXTERNAL, cb, cb_opaque); } static void net_slirp_timer_free(void *timer, void *opaque) { timer_free(timer); } static void net_slirp_timer_mod(void *timer, int64_t expire_timer, void *opaque) { timer_mod(timer, expire_timer); } static void net_slirp_register_poll_fd(int fd, void *opaque) { qemu_fd_register(fd); } static void net_slirp_unregister_poll_fd(int fd, void *opaque) { /* no qemu_fd_unregister */ } static void net_slirp_notify(void *opaque) { qemu_notify_event(); } static const SlirpCb slirp_cb = { .send_packet = net_slirp_send_packet, .guest_error = net_slirp_guest_error, .clock_get_ns = net_slirp_clock_get_ns, .timer_new = net_slirp_timer_new, .timer_free = net_slirp_timer_free, .timer_mod = net_slirp_timer_mod, .register_poll_fd = net_slirp_register_poll_fd, .unregister_poll_fd = net_slirp_unregister_poll_fd, .notify = net_slirp_notify, }; static int slirp_poll_to_gio(int events) { int ret = 0; if (events & SLIRP_POLL_IN) { ret |= G_IO_IN; } if (events & SLIRP_POLL_OUT) { ret |= G_IO_OUT; } if (events & SLIRP_POLL_PRI) { ret |= G_IO_PRI; } if (events & SLIRP_POLL_ERR) { ret |= G_IO_ERR; } if (events & SLIRP_POLL_HUP) { ret |= G_IO_HUP; } return ret; } static int net_slirp_add_poll(int fd, int events, void *opaque) { GArray *pollfds = opaque; GPollFD pfd = { .fd = fd, .events = slirp_poll_to_gio(events), }; int idx = pollfds->len; g_array_append_val(pollfds, pfd); return idx; } static int slirp_gio_to_poll(int events) { int ret = 0; if (events & G_IO_IN) { ret |= SLIRP_POLL_IN; } if (events & G_IO_OUT) { ret |= SLIRP_POLL_OUT; } if (events & G_IO_PRI) { ret |= SLIRP_POLL_PRI; } if (events & G_IO_ERR) { ret |= SLIRP_POLL_ERR; } if (events & G_IO_HUP) { ret |= SLIRP_POLL_HUP; } return ret; } static int net_slirp_get_revents(int idx, void *opaque) { GArray *pollfds = opaque; return slirp_gio_to_poll(g_array_index(pollfds, GPollFD, idx).revents); } static void net_slirp_poll_notify(Notifier *notifier, void *data) { MainLoopPoll *poll = data; SlirpState *s = container_of(notifier, SlirpState, poll_notifier); switch (poll->state) { case MAIN_LOOP_POLL_FILL: slirp_pollfds_fill(s->slirp, &poll->timeout, net_slirp_add_poll, poll->pollfds); break; case MAIN_LOOP_POLL_OK: case MAIN_LOOP_POLL_ERR: slirp_pollfds_poll(s->slirp, poll->state == MAIN_LOOP_POLL_ERR, net_slirp_get_revents, poll->pollfds); break; default: g_assert_not_reached(); } } static ssize_t net_slirp_stream_read(void *buf, size_t size, void *opaque) { QEMUFile *f = opaque; return qemu_get_buffer(f, buf, size); } static ssize_t net_slirp_stream_write(const void *buf, size_t size, void *opaque) { QEMUFile *f = opaque; qemu_put_buffer(f, buf, size); if (qemu_file_get_error(f)) { return -1; } return size; } static int net_slirp_state_load(QEMUFile *f, void *opaque, int version_id) { Slirp *slirp = opaque; return slirp_state_load(slirp, version_id, net_slirp_stream_read, f); } static void net_slirp_state_save(QEMUFile *f, void *opaque) { Slirp *slirp = opaque; slirp_state_save(slirp, net_slirp_stream_write, f); } static SaveVMHandlers savevm_slirp_state = { .save_state = net_slirp_state_save, .load_state = net_slirp_state_load, }; static int net_slirp_init(NetClientState *peer, const char *model, const char *name, int restricted, bool ipv4, const char *vnetwork, const char *vhost, bool ipv6, const char *vprefix6, int vprefix6_len, const char *vhost6, const char *vhostname, const char *tftp_export, const char *bootfile, const char *vdhcp_start, const char *vnameserver, const char *vnameserver6, const char *smb_export, const char *vsmbserver, const char **dnssearch, const char *vdomainname, const char *tftp_server_name, Error **errp) { /* default settings according to historic slirp */ struct in_addr net = { .s_addr = htonl(0x0a000200) }; /* 10.0.2.0 */ struct in_addr mask = { .s_addr = htonl(0xffffff00) }; /* 255.255.255.0 */ struct in_addr host = { .s_addr = htonl(0x0a000202) }; /* 10.0.2.2 */ struct in_addr dhcp = { .s_addr = htonl(0x0a00020f) }; /* 10.0.2.15 */ struct in_addr dns = { .s_addr = htonl(0x0a000203) }; /* 10.0.2.3 */ struct in6_addr ip6_prefix; struct in6_addr ip6_host; struct in6_addr ip6_dns; #ifndef _WIN32 struct in_addr smbsrv = { .s_addr = 0 }; #endif NetClientState *nc; SlirpState *s; char buf[20]; uint32_t addr; int shift; char *end; struct slirp_config_str *config; NetdevUserOptions *stored; StringList **stored_hostfwd; StringList **stored_guestfwd; if (!ipv4 && (vnetwork || vhost || vnameserver)) { error_setg(errp, "IPv4 disabled but netmask/host/dns provided"); return -1; } if (!ipv6 && (vprefix6 || vhost6 || vnameserver6)) { error_setg(errp, "IPv6 disabled but prefix/host6/dns6 provided"); return -1; } if (!ipv4 && !ipv6) { /* It doesn't make sense to disable both */ error_setg(errp, "IPv4 and IPv6 disabled"); return -1; } if (vnetwork) { if (get_str_sep(buf, sizeof(buf), &vnetwork, '/') < 0) { if (!inet_aton(vnetwork, &net)) { error_setg(errp, "Failed to parse netmask"); return -1; } addr = ntohl(net.s_addr); if (!(addr & 0x80000000)) { mask.s_addr = htonl(0xff000000); /* class A */ } else if ((addr & 0xfff00000) == 0xac100000) { mask.s_addr = htonl(0xfff00000); /* priv. 172.16.0.0/12 */ } else if ((addr & 0xc0000000) == 0x80000000) { mask.s_addr = htonl(0xffff0000); /* class B */ } else if ((addr & 0xffff0000) == 0xc0a80000) { mask.s_addr = htonl(0xffff0000); /* priv. 192.168.0.0/16 */ } else if ((addr & 0xffff0000) == 0xc6120000) { mask.s_addr = htonl(0xfffe0000); /* tests 198.18.0.0/15 */ } else if ((addr & 0xe0000000) == 0xe0000000) { mask.s_addr = htonl(0xffffff00); /* class C */ } else { mask.s_addr = htonl(0xfffffff0); /* multicast/reserved */ } } else { if (!inet_aton(buf, &net)) { error_setg(errp, "Failed to parse netmask"); return -1; } shift = strtol(vnetwork, &end, 10); if (*end != '\0') { if (!inet_aton(vnetwork, &mask)) { error_setg(errp, "Failed to parse netmask (trailing chars)"); return -1; } } else if (shift < 4 || shift > 32) { error_setg(errp, "Invalid netmask provided (must be in range 4-32)"); return -1; } else { mask.s_addr = htonl(0xffffffff << (32 - shift)); } } net.s_addr &= mask.s_addr; host.s_addr = net.s_addr | (htonl(0x0202) & ~mask.s_addr); dhcp.s_addr = net.s_addr | (htonl(0x020f) & ~mask.s_addr); dns.s_addr = net.s_addr | (htonl(0x0203) & ~mask.s_addr); } if (vhost && !inet_aton(vhost, &host)) { error_setg(errp, "Failed to parse host"); return -1; } if ((host.s_addr & mask.s_addr) != net.s_addr) { error_setg(errp, "Host doesn't belong to network"); return -1; } if (vnameserver && !inet_aton(vnameserver, &dns)) { error_setg(errp, "Failed to parse DNS"); return -1; } if (restricted && (dns.s_addr & mask.s_addr) != net.s_addr) { error_setg(errp, "DNS doesn't belong to network"); return -1; } if (dns.s_addr == host.s_addr) { error_setg(errp, "DNS must be different from host"); return -1; } if (vdhcp_start && !inet_aton(vdhcp_start, &dhcp)) { error_setg(errp, "Failed to parse DHCP start address"); return -1; } if ((dhcp.s_addr & mask.s_addr) != net.s_addr) { error_setg(errp, "DHCP doesn't belong to network"); return -1; } if (dhcp.s_addr == host.s_addr || dhcp.s_addr == dns.s_addr) { error_setg(errp, "DHCP must be different from host and DNS"); return -1; } #ifndef _WIN32 if (vsmbserver && !inet_aton(vsmbserver, &smbsrv)) { error_setg(errp, "Failed to parse SMB address"); return -1; } #endif if (!vprefix6) { vprefix6 = "fec0::"; } if (!inet_pton(AF_INET6, vprefix6, &ip6_prefix)) { error_setg(errp, "Failed to parse IPv6 prefix"); return -1; } if (!vprefix6_len) { vprefix6_len = 64; } if (vprefix6_len < 0 || vprefix6_len > 126) { error_setg(errp, "Invalid IPv6 prefix provided " "(IPv6 prefix length must be between 0 and 126)"); return -1; } if (vhost6) { if (!inet_pton(AF_INET6, vhost6, &ip6_host)) { error_setg(errp, "Failed to parse IPv6 host"); return -1; } if (!in6_equal_net(&ip6_prefix, &ip6_host, vprefix6_len)) { error_setg(errp, "IPv6 Host doesn't belong to network"); return -1; } } else { ip6_host = ip6_prefix; ip6_host.s6_addr[15] |= 2; } if (vnameserver6) { if (!inet_pton(AF_INET6, vnameserver6, &ip6_dns)) { error_setg(errp, "Failed to parse IPv6 DNS"); return -1; } if (restricted && !in6_equal_net(&ip6_prefix, &ip6_dns, vprefix6_len)) { error_setg(errp, "IPv6 DNS doesn't belong to network"); return -1; } } else { ip6_dns = ip6_prefix; ip6_dns.s6_addr[15] |= 3; } if (vdomainname && !*vdomainname) { error_setg(errp, "'domainname' parameter cannot be empty"); return -1; } if (vdomainname && strlen(vdomainname) > 255) { error_setg(errp, "'domainname' parameter cannot exceed 255 bytes"); return -1; } if (vhostname && strlen(vhostname) > 255) { error_setg(errp, "'vhostname' parameter cannot exceed 255 bytes"); return -1; } if (tftp_server_name && strlen(tftp_server_name) > 255) { error_setg(errp, "'tftp-server-name' parameter cannot exceed 255 bytes"); return -1; } nc = qemu_new_net_client(&net_slirp_info, peer, model, name); /* Store startup parameters */ nc->stored_config = g_new0(NetdevInfo, 1); nc->stored_config->type = NET_BACKEND_USER; stored = &nc->stored_config->u.user; if (vhostname) { stored->has_hostname = true; stored->hostname = g_strdup(vhostname); } stored->has_q_restrict = true; stored->q_restrict = restricted; stored->has_ipv4 = true; stored->ipv4 = ipv4; stored->has_ipv6 = true; stored->ipv6 = ipv6; if (ipv4) { uint8_t *net_bytes = (uint8_t *)&net; uint8_t *mask_bytes = (uint8_t *)&mask; stored->has_net = true; stored->net = g_strdup_printf("%d.%d.%d.%d/%d.%d.%d.%d", net_bytes[0], net_bytes[1], net_bytes[2], net_bytes[3], mask_bytes[0], mask_bytes[1], mask_bytes[2], mask_bytes[3]); stored->has_host = true; stored->host = g_strdup(inet_ntoa(host)); } if (tftp_export) { stored->has_tftp = true; stored->tftp = g_strdup(tftp_export); } if (bootfile) { stored->has_bootfile = true; stored->bootfile = g_strdup(bootfile); } if (vdhcp_start) { stored->has_dhcpstart = true; stored->dhcpstart = g_strdup(vdhcp_start); } if (ipv4) { stored->has_dns = true; stored->dns = g_strdup(inet_ntoa(dns)); } if (dnssearch) { stored->has_dnssearch = true; StringList **stored_list = &stored->dnssearch; for (int i = 0; dnssearch[i]; i++) { String *element = g_new0(String, 1); element->str = g_strdup(dnssearch[i]); QAPI_LIST_APPEND(stored_list, element); } } if (vdomainname) { stored->has_domainname = true; stored->domainname = g_strdup(vdomainname); } if (ipv6) { char addrstr[INET6_ADDRSTRLEN]; const char *res; stored->has_ipv6_prefix = true; stored->ipv6_prefix = g_strdup(vprefix6); stored->has_ipv6_prefixlen = true; stored->ipv6_prefixlen = vprefix6_len; res = inet_ntop(AF_INET6, &ip6_host, addrstr, sizeof(addrstr)); stored->has_ipv6_host = true; stored->ipv6_host = g_strdup(res); res = inet_ntop(AF_INET6, &ip6_dns, addrstr, sizeof(addrstr)); stored->has_ipv6_dns = true; stored->ipv6_dns = g_strdup(res); } if (smb_export) { stored->has_smb = true; stored->smb = g_strdup(smb_export); } if (vsmbserver) { stored->has_smbserver = true; stored->smbserver = g_strdup(vsmbserver); } if (tftp_server_name) { stored->has_tftp_server_name = true; stored->tftp_server_name = g_strdup(tftp_server_name); } nc->info_str = g_strdup_printf("net=%s,restrict=%s", inet_ntoa(net), restricted ? "on" : "off"); s = DO_UPCAST(SlirpState, nc, nc); s->slirp = slirp_init(restricted, ipv4, net, mask, host, ipv6, ip6_prefix, vprefix6_len, ip6_host, vhostname, tftp_server_name, tftp_export, bootfile, dhcp, dns, ip6_dns, dnssearch, vdomainname, &slirp_cb, s); QTAILQ_INSERT_TAIL(&slirp_stacks, s, entry); /* * Make sure the current bitstream version of slirp is 4, to avoid * QEMU migration incompatibilities, if upstream slirp bumped the * version. * * FIXME: use bitfields of features? teach libslirp to save with * specific version? */ g_assert(slirp_state_version() == 4); register_savevm_live("slirp", 0, slirp_state_version(), &savevm_slirp_state, s->slirp); s->poll_notifier.notify = net_slirp_poll_notify; main_loop_poll_add_notifier(&s->poll_notifier); stored_hostfwd = &stored->hostfwd; stored_guestfwd = &stored->guestfwd; for (config = slirp_configs; config; config = config->next) { String *element = g_new0(String, 1); element->str = g_strdup(config->str); if (config->flags & SLIRP_CFG_HOSTFWD) { if (slirp_hostfwd(s, config->str, errp) < 0) { goto error; } stored->has_hostfwd = true; QAPI_LIST_APPEND(stored_hostfwd, element); } else { if (slirp_guestfwd(s, config->str, errp) < 0) { goto error; } stored->has_guestfwd = true; QAPI_LIST_APPEND(stored_guestfwd, element); } } #ifndef _WIN32 if (smb_export) { if (slirp_smb(s, smb_export, smbsrv, errp) < 0) { goto error; } } #endif s->exit_notifier.notify = slirp_smb_exit; qemu_add_exit_notifier(&s->exit_notifier); return 0; error: qemu_del_net_client(nc); return -1; } static SlirpState *slirp_lookup(Monitor *mon, const char *id) { if (id) { NetClientState *nc = qemu_find_netdev(id); if (!nc) { monitor_printf(mon, "unrecognized netdev id '%s'\n", id); return NULL; } if (strcmp(nc->model, "user")) { monitor_printf(mon, "invalid device specified\n"); return NULL; } return DO_UPCAST(SlirpState, nc, nc); } else { if (QTAILQ_EMPTY(&slirp_stacks)) { monitor_printf(mon, "user mode network stack not in use\n"); return NULL; } return QTAILQ_FIRST(&slirp_stacks); } } void hmp_hostfwd_remove(Monitor *mon, const QDict *qdict) { struct in_addr host_addr = { .s_addr = INADDR_ANY }; int host_port; char buf[256]; const char *src_str, *p; SlirpState *s; int is_udp = 0; int err; const char *arg1 = qdict_get_str(qdict, "arg1"); const char *arg2 = qdict_get_try_str(qdict, "arg2"); if (arg2) { s = slirp_lookup(mon, arg1); src_str = arg2; } else { s = slirp_lookup(mon, NULL); src_str = arg1; } if (!s) { return; } p = src_str; if (!p || get_str_sep(buf, sizeof(buf), &p, ':') < 0) { goto fail_syntax; } if (!strcmp(buf, "tcp") || buf[0] == '\0') { is_udp = 0; } else if (!strcmp(buf, "udp")) { is_udp = 1; } else { goto fail_syntax; } if (get_str_sep(buf, sizeof(buf), &p, ':') < 0) { goto fail_syntax; } if (buf[0] != '\0' && !inet_aton(buf, &host_addr)) { goto fail_syntax; } if (qemu_strtoi(p, NULL, 10, &host_port)) { goto fail_syntax; } err = slirp_remove_hostfwd(s->slirp, is_udp, host_addr, host_port); monitor_printf(mon, "host forwarding rule for %s %s\n", src_str, err ? "not found" : "removed"); return; fail_syntax: monitor_printf(mon, "invalid format\n"); } static int slirp_hostfwd(SlirpState *s, const char *redir_str, Error **errp) { struct in_addr host_addr = { .s_addr = INADDR_ANY }; struct in_addr guest_addr = { .s_addr = 0 }; int host_port, guest_port; const char *p; char buf[256]; int is_udp; char *end; const char *fail_reason = "Unknown reason"; p = redir_str; if (!p || get_str_sep(buf, sizeof(buf), &p, ':') < 0) { fail_reason = "No : separators"; goto fail_syntax; } if (!strcmp(buf, "tcp") || buf[0] == '\0') { is_udp = 0; } else if (!strcmp(buf, "udp")) { is_udp = 1; } else { fail_reason = "Bad protocol name"; goto fail_syntax; } if (get_str_sep(buf, sizeof(buf), &p, ':') < 0) { fail_reason = "Missing : separator"; goto fail_syntax; } if (buf[0] != '\0' && !inet_aton(buf, &host_addr)) { fail_reason = "Bad host address"; goto fail_syntax; } if (get_str_sep(buf, sizeof(buf), &p, '-') < 0) { fail_reason = "Bad host port separator"; goto fail_syntax; } host_port = strtol(buf, &end, 0); if (*end != '\0' || host_port < 0 || host_port > 65535) { fail_reason = "Bad host port"; goto fail_syntax; } if (get_str_sep(buf, sizeof(buf), &p, ':') < 0) { fail_reason = "Missing guest address"; goto fail_syntax; } if (buf[0] != '\0' && !inet_aton(buf, &guest_addr)) { fail_reason = "Bad guest address"; goto fail_syntax; } guest_port = strtol(p, &end, 0); if (*end != '\0' || guest_port < 1 || guest_port > 65535) { fail_reason = "Bad guest port"; goto fail_syntax; } if (slirp_add_hostfwd(s->slirp, is_udp, host_addr, host_port, guest_addr, guest_port) < 0) { error_setg(errp, "Could not set up host forwarding rule '%s'", redir_str); return -1; } return 0; fail_syntax: error_setg(errp, "Invalid host forwarding rule '%s' (%s)", redir_str, fail_reason); return -1; } void hmp_hostfwd_add(Monitor *mon, const QDict *qdict) { const char *redir_str; SlirpState *s; const char *arg1 = qdict_get_str(qdict, "arg1"); const char *arg2 = qdict_get_try_str(qdict, "arg2"); if (arg2) { s = slirp_lookup(mon, arg1); redir_str = arg2; } else { s = slirp_lookup(mon, NULL); redir_str = arg1; } if (s) { Error *err = NULL; if (slirp_hostfwd(s, redir_str, &err) < 0) { error_report_err(err); } } } #ifndef _WIN32 /* automatic user mode samba server configuration */ static void slirp_smb_cleanup(SlirpState *s) { int ret; if (s->smb_dir) { gchar *cmd = g_strdup_printf("rm -rf %s", s->smb_dir); ret = system(cmd); if (ret == -1 || !WIFEXITED(ret)) { error_report("'%s' failed.", cmd); } else if (WEXITSTATUS(ret)) { error_report("'%s' failed. Error code: %d", cmd, WEXITSTATUS(ret)); } g_free(cmd); g_free(s->smb_dir); s->smb_dir = NULL; } } static int slirp_smb(SlirpState* s, const char *exported_dir, struct in_addr vserver_addr, Error **errp) { char *smb_conf; char *smb_cmdline; struct passwd *passwd; FILE *f; passwd = getpwuid(geteuid()); if (!passwd) { error_setg(errp, "Failed to retrieve user name"); return -1; } if (access(CONFIG_SMBD_COMMAND, F_OK)) { error_setg(errp, "Could not find '%s', please install it", CONFIG_SMBD_COMMAND); return -1; } if (access(exported_dir, R_OK | X_OK)) { error_setg(errp, "Error accessing shared directory '%s': %s", exported_dir, strerror(errno)); return -1; } s->smb_dir = g_dir_make_tmp("qemu-smb.XXXXXX", NULL); if (!s->smb_dir) { error_setg(errp, "Could not create samba server dir"); return -1; } smb_conf = g_strdup_printf("%s/%s", s->smb_dir, "smb.conf"); f = fopen(smb_conf, "w"); if (!f) { slirp_smb_cleanup(s); error_setg(errp, "Could not create samba server configuration file '%s'", smb_conf); g_free(smb_conf); return -1; } fprintf(f, "[global]\n" "private dir=%s\n" "interfaces=127.0.0.1\n" "bind interfaces only=yes\n" "pid directory=%s\n" "lock directory=%s\n" "state directory=%s\n" "cache directory=%s\n" "ncalrpc dir=%s/ncalrpc\n" "log file=%s/log.smbd\n" "smb passwd file=%s/smbpasswd\n" "security = user\n" "map to guest = Bad User\n" "load printers = no\n" "printing = bsd\n" "disable spoolss = yes\n" "usershare max shares = 0\n" "[qemu]\n" "path=%s\n" "read only=no\n" "guest ok=yes\n" "force user=%s\n", s->smb_dir, s->smb_dir, s->smb_dir, s->smb_dir, s->smb_dir, s->smb_dir, s->smb_dir, s->smb_dir, exported_dir, passwd->pw_name ); fclose(f); smb_cmdline = g_strdup_printf("%s -l %s -s %s", CONFIG_SMBD_COMMAND, s->smb_dir, smb_conf); g_free(smb_conf); if (slirp_add_exec(s->slirp, smb_cmdline, &vserver_addr, 139) < 0 || slirp_add_exec(s->slirp, smb_cmdline, &vserver_addr, 445) < 0) { slirp_smb_cleanup(s); g_free(smb_cmdline); error_setg(errp, "Conflicting/invalid smbserver address"); return -1; } g_free(smb_cmdline); return 0; } #endif /* !defined(_WIN32) */ static int guestfwd_can_read(void *opaque) { struct GuestFwd *fwd = opaque; return slirp_socket_can_recv(fwd->slirp, fwd->server, fwd->port); } static void guestfwd_read(void *opaque, const uint8_t *buf, int size) { struct GuestFwd *fwd = opaque; slirp_socket_recv(fwd->slirp, fwd->server, fwd->port, buf, size); } static ssize_t guestfwd_write(const void *buf, size_t len, void *chr) { return qemu_chr_fe_write_all(chr, buf, len); } static int slirp_guestfwd(SlirpState *s, const char *config_str, Error **errp) { /* TODO: IPv6 */ struct in_addr server = { .s_addr = 0 }; struct GuestFwd *fwd; const char *p; char buf[128]; char *end; int port; p = config_str; if (get_str_sep(buf, sizeof(buf), &p, ':') < 0) { goto fail_syntax; } if (strcmp(buf, "tcp") && buf[0] != '\0') { goto fail_syntax; } if (get_str_sep(buf, sizeof(buf), &p, ':') < 0) { goto fail_syntax; } if (buf[0] != '\0' && !inet_aton(buf, &server)) { goto fail_syntax; } if (get_str_sep(buf, sizeof(buf), &p, '-') < 0) { goto fail_syntax; } port = strtol(buf, &end, 10); if (*end != '\0' || port < 1 || port > 65535) { goto fail_syntax; } snprintf(buf, sizeof(buf), "guestfwd.tcp.%d", port); if (g_str_has_prefix(p, "cmd:")) { if (slirp_add_exec(s->slirp, &p[4], &server, port) < 0) { error_setg(errp, "Conflicting/invalid host:port in guest " "forwarding rule '%s'", config_str); return -1; } } else { Error *err = NULL; /* * FIXME: sure we want to support implicit * muxed monitors here? */ Chardev *chr = qemu_chr_new_mux_mon(buf, p, NULL); if (!chr) { error_setg(errp, "Could not open guest forwarding device '%s'", buf); return -1; } fwd = g_new(struct GuestFwd, 1); qemu_chr_fe_init(&fwd->hd, chr, &err); if (err) { error_propagate(errp, err); object_unparent(OBJECT(chr)); g_free(fwd); return -1; } if (slirp_add_guestfwd(s->slirp, guestfwd_write, &fwd->hd, &server, port) < 0) { error_setg(errp, "Conflicting/invalid host:port in guest " "forwarding rule '%s'", config_str); qemu_chr_fe_deinit(&fwd->hd, true); g_free(fwd); return -1; } fwd->server = server; fwd->port = port; fwd->slirp = s->slirp; qemu_chr_fe_set_handlers(&fwd->hd, guestfwd_can_read, guestfwd_read, NULL, NULL, fwd, NULL, true); s->fwd = g_slist_append(s->fwd, fwd); } return 0; fail_syntax: error_setg(errp, "Invalid guest forwarding rule '%s'", config_str); return -1; } void hmp_info_usernet(Monitor *mon, const QDict *qdict) { SlirpState *s; QTAILQ_FOREACH(s, &slirp_stacks, entry) { int id; bool got_hub_id = net_hub_id_for_client(&s->nc, &id) == 0; char *info = slirp_connection_info(s->slirp); monitor_printf(mon, "Hub %d (%s):\n%s", got_hub_id ? id : -1, s->nc.name, info); g_free(info); } } static void net_init_slirp_configs(const StringList *fwd, int flags) { while (fwd) { struct slirp_config_str *config; config = g_malloc0(sizeof(*config)); pstrcpy(config->str, sizeof(config->str), fwd->value->str); config->flags = flags; config->next = slirp_configs; slirp_configs = config; fwd = fwd->next; } } static const char **slirp_dnssearch(const StringList *dnsname) { const StringList *c = dnsname; size_t i = 0, num_opts = 0; const char **ret; while (c) { num_opts++; c = c->next; } if (num_opts == 0) { return NULL; } ret = g_malloc((num_opts + 1) * sizeof(*ret)); c = dnsname; while (c) { ret[i++] = c->value->str; c = c->next; } ret[i] = NULL; return ret; } int net_init_slirp(const Netdev *netdev, const char *name, NetClientState *peer, Error **errp) { struct slirp_config_str *config; char *vnet; int ret; const NetdevUserOptions *user; const char **dnssearch; bool ipv4 = true, ipv6 = true; assert(netdev->type == NET_CLIENT_DRIVER_USER); user = &netdev->u.user; if ((user->has_ipv6 && user->ipv6 && !user->has_ipv4) || (user->has_ipv4 && !user->ipv4)) { ipv4 = 0; } if ((user->has_ipv4 && user->ipv4 && !user->has_ipv6) || (user->has_ipv6 && !user->ipv6)) { ipv6 = 0; } vnet = user->has_net ? g_strdup(user->net) : user->has_ip ? g_strdup_printf("%s/24", user->ip) : NULL; dnssearch = slirp_dnssearch(user->dnssearch); /* all optional fields are initialized to "all bits zero" */ net_init_slirp_configs(user->hostfwd, SLIRP_CFG_HOSTFWD); net_init_slirp_configs(user->guestfwd, 0); ret = net_slirp_init(peer, "user", name, user->q_restrict, ipv4, vnet, user->host, ipv6, user->ipv6_prefix, user->ipv6_prefixlen, user->ipv6_host, user->hostname, user->tftp, user->bootfile, user->dhcpstart, user->dns, user->ipv6_dns, user->smb, user->smbserver, dnssearch, user->domainname, user->tftp_server_name, errp); while (slirp_configs) { config = slirp_configs; slirp_configs = config->next; g_free(config); } g_free(vnet); g_free(dnssearch); return ret; }