4 * Copyright (c) 2003-2008 Fabrice Bellard
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:
13 * The above copyright notice and this permission notice shall be included in
14 * all copies or substantial portions of the Software.
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
24 #include "qemu/osdep.h"
25 #include "net/slirp.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 "qemu/cutils.h"
43 static int get_str_sep(char *buf, int buf_size, const char **pp, int sep)
54 if (len > buf_size - 1)
63 /* slirp network adapter */
65 #define SLIRP_CFG_HOSTFWD 1
66 #define SLIRP_CFG_LEGACY 2
68 struct slirp_config_str {
69 struct slirp_config_str *next;
75 typedef struct SlirpState {
77 QTAILQ_ENTRY(SlirpState) entry;
84 static struct slirp_config_str *slirp_configs;
85 const char *legacy_tftp_prefix;
86 const char *legacy_bootp_filename;
87 static QTAILQ_HEAD(slirp_stacks, SlirpState) slirp_stacks =
88 QTAILQ_HEAD_INITIALIZER(slirp_stacks);
90 static int slirp_hostfwd(SlirpState *s, const char *redir_str,
92 static int slirp_guestfwd(SlirpState *s, const char *config_str,
96 static const char *legacy_smb_export;
98 static int slirp_smb(SlirpState *s, const char *exported_dir,
99 struct in_addr vserver_addr);
100 static void slirp_smb_cleanup(SlirpState *s);
102 static inline void slirp_smb_cleanup(SlirpState *s) { }
105 void slirp_output(void *opaque, const uint8_t *pkt, int pkt_len)
107 SlirpState *s = opaque;
109 qemu_send_packet(&s->nc, pkt, pkt_len);
112 static ssize_t net_slirp_receive(NetClientState *nc, const uint8_t *buf, size_t size)
114 SlirpState *s = DO_UPCAST(SlirpState, nc, nc);
116 slirp_input(s->slirp, buf, size);
121 static void net_slirp_cleanup(NetClientState *nc)
123 SlirpState *s = DO_UPCAST(SlirpState, nc, nc);
125 slirp_cleanup(s->slirp);
126 slirp_smb_cleanup(s);
127 QTAILQ_REMOVE(&slirp_stacks, s, entry);
130 static NetClientInfo net_slirp_info = {
131 .type = NET_CLIENT_OPTIONS_KIND_USER,
132 .size = sizeof(SlirpState),
133 .receive = net_slirp_receive,
134 .cleanup = net_slirp_cleanup,
137 static int net_slirp_init(NetClientState *peer, const char *model,
138 const char *name, int restricted,
139 bool ipv4, const char *vnetwork, const char *vhost,
140 bool ipv6, const char *vprefix6, int vprefix6_len,
142 const char *vhostname, const char *tftp_export,
143 const char *bootfile, const char *vdhcp_start,
144 const char *vnameserver, const char *vnameserver6,
145 const char *smb_export, const char *vsmbserver,
146 const char **dnssearch)
148 /* default settings according to historic slirp */
149 struct in_addr net = { .s_addr = htonl(0x0a000200) }; /* 10.0.2.0 */
150 struct in_addr mask = { .s_addr = htonl(0xffffff00) }; /* 255.255.255.0 */
151 struct in_addr host = { .s_addr = htonl(0x0a000202) }; /* 10.0.2.2 */
152 struct in_addr dhcp = { .s_addr = htonl(0x0a00020f) }; /* 10.0.2.15 */
153 struct in_addr dns = { .s_addr = htonl(0x0a000203) }; /* 10.0.2.3 */
154 struct in6_addr ip6_prefix;
155 struct in6_addr ip6_host;
156 struct in6_addr ip6_dns;
158 struct in_addr smbsrv = { .s_addr = 0 };
166 struct slirp_config_str *config;
168 if (!ipv4 && (vnetwork || vhost || vnameserver)) {
172 if (!ipv6 && (vprefix6 || vhost6 || vnameserver6)) {
176 if (!ipv4 && !ipv6) {
177 /* It doesn't make sense to disable both */
182 tftp_export = legacy_tftp_prefix;
185 bootfile = legacy_bootp_filename;
189 if (get_str_sep(buf, sizeof(buf), &vnetwork, '/') < 0) {
190 if (!inet_aton(vnetwork, &net)) {
193 addr = ntohl(net.s_addr);
194 if (!(addr & 0x80000000)) {
195 mask.s_addr = htonl(0xff000000); /* class A */
196 } else if ((addr & 0xfff00000) == 0xac100000) {
197 mask.s_addr = htonl(0xfff00000); /* priv. 172.16.0.0/12 */
198 } else if ((addr & 0xc0000000) == 0x80000000) {
199 mask.s_addr = htonl(0xffff0000); /* class B */
200 } else if ((addr & 0xffff0000) == 0xc0a80000) {
201 mask.s_addr = htonl(0xffff0000); /* priv. 192.168.0.0/16 */
202 } else if ((addr & 0xffff0000) == 0xc6120000) {
203 mask.s_addr = htonl(0xfffe0000); /* tests 198.18.0.0/15 */
204 } else if ((addr & 0xe0000000) == 0xe0000000) {
205 mask.s_addr = htonl(0xffffff00); /* class C */
207 mask.s_addr = htonl(0xfffffff0); /* multicast/reserved */
210 if (!inet_aton(buf, &net)) {
213 shift = strtol(vnetwork, &end, 10);
215 if (!inet_aton(vnetwork, &mask)) {
218 } else if (shift < 4 || shift > 32) {
221 mask.s_addr = htonl(0xffffffff << (32 - shift));
224 net.s_addr &= mask.s_addr;
225 host.s_addr = net.s_addr | (htonl(0x0202) & ~mask.s_addr);
226 dhcp.s_addr = net.s_addr | (htonl(0x020f) & ~mask.s_addr);
227 dns.s_addr = net.s_addr | (htonl(0x0203) & ~mask.s_addr);
230 if (vhost && !inet_aton(vhost, &host)) {
233 if ((host.s_addr & mask.s_addr) != net.s_addr) {
237 if (vnameserver && !inet_aton(vnameserver, &dns)) {
240 if ((dns.s_addr & mask.s_addr) != net.s_addr ||
241 dns.s_addr == host.s_addr) {
245 if (vdhcp_start && !inet_aton(vdhcp_start, &dhcp)) {
248 if ((dhcp.s_addr & mask.s_addr) != net.s_addr ||
249 dhcp.s_addr == host.s_addr || dhcp.s_addr == dns.s_addr) {
254 if (vsmbserver && !inet_aton(vsmbserver, &smbsrv)) {
259 #if defined(_WIN32) && (_WIN32_WINNT < 0x0600)
260 /* No inet_pton helper before Vista... */
265 memset(&ip6_prefix, 0, sizeof(ip6_prefix));
266 ip6_prefix.s6_addr[0] = 0xfe;
267 ip6_prefix.s6_addr[1] = 0xc0;
272 if (!inet_pton(AF_INET6, vprefix6, &ip6_prefix)) {
280 if (vprefix6_len < 0 || vprefix6_len > 126) {
285 #if defined(_WIN32) && (_WIN32_WINNT < 0x0600)
288 if (!inet_pton(AF_INET6, vhost6, &ip6_host)) {
291 if (!in6_equal_net(&ip6_prefix, &ip6_host, vprefix6_len)) {
296 ip6_host = ip6_prefix;
297 ip6_host.s6_addr[15] |= 2;
301 #if defined(_WIN32) && (_WIN32_WINNT < 0x0600)
304 if (!inet_pton(AF_INET6, vnameserver6, &ip6_dns)) {
307 if (!in6_equal_net(&ip6_prefix, &ip6_dns, vprefix6_len)) {
312 ip6_dns = ip6_prefix;
313 ip6_dns.s6_addr[15] |= 3;
317 nc = qemu_new_net_client(&net_slirp_info, peer, model, name);
319 snprintf(nc->info_str, sizeof(nc->info_str),
320 "net=%s,restrict=%s", inet_ntoa(net),
321 restricted ? "on" : "off");
323 s = DO_UPCAST(SlirpState, nc, nc);
325 s->slirp = slirp_init(restricted, ipv4, net, mask, host,
326 ipv6, ip6_prefix, vprefix6_len, ip6_host,
327 vhostname, tftp_export, bootfile, dhcp,
328 dns, ip6_dns, dnssearch, s);
329 QTAILQ_INSERT_TAIL(&slirp_stacks, s, entry);
331 for (config = slirp_configs; config; config = config->next) {
332 if (config->flags & SLIRP_CFG_HOSTFWD) {
333 if (slirp_hostfwd(s, config->str,
334 config->flags & SLIRP_CFG_LEGACY) < 0)
337 if (slirp_guestfwd(s, config->str,
338 config->flags & SLIRP_CFG_LEGACY) < 0)
344 smb_export = legacy_smb_export;
347 if (slirp_smb(s, smb_export, smbsrv) < 0)
355 qemu_del_net_client(nc);
359 static SlirpState *slirp_lookup(Monitor *mon, const char *vlan,
365 nc = net_hub_find_client_by_name(strtol(vlan, NULL, 0), stack);
367 monitor_printf(mon, "unrecognized (vlan-id, stackname) pair\n");
370 if (strcmp(nc->model, "user")) {
371 monitor_printf(mon, "invalid device specified\n");
374 return DO_UPCAST(SlirpState, nc, nc);
376 if (QTAILQ_EMPTY(&slirp_stacks)) {
377 monitor_printf(mon, "user mode network stack not in use\n");
380 return QTAILQ_FIRST(&slirp_stacks);
384 void hmp_hostfwd_remove(Monitor *mon, const QDict *qdict)
386 struct in_addr host_addr = { .s_addr = INADDR_ANY };
389 const char *src_str, *p;
393 const char *arg1 = qdict_get_str(qdict, "arg1");
394 const char *arg2 = qdict_get_try_str(qdict, "arg2");
395 const char *arg3 = qdict_get_try_str(qdict, "arg3");
398 s = slirp_lookup(mon, arg1, arg2);
401 s = slirp_lookup(mon, NULL, NULL);
409 if (!p || get_str_sep(buf, sizeof(buf), &p, ':') < 0) {
413 if (!strcmp(buf, "tcp") || buf[0] == '\0') {
415 } else if (!strcmp(buf, "udp")) {
421 if (get_str_sep(buf, sizeof(buf), &p, ':') < 0) {
424 if (buf[0] != '\0' && !inet_aton(buf, &host_addr)) {
430 err = slirp_remove_hostfwd(s->slirp, is_udp, host_addr, host_port);
432 monitor_printf(mon, "host forwarding rule for %s %s\n", src_str,
433 err ? "not found" : "removed");
437 monitor_printf(mon, "invalid format\n");
440 static int slirp_hostfwd(SlirpState *s, const char *redir_str,
443 struct in_addr host_addr = { .s_addr = INADDR_ANY };
444 struct in_addr guest_addr = { .s_addr = 0 };
445 int host_port, guest_port;
452 if (!p || get_str_sep(buf, sizeof(buf), &p, ':') < 0) {
455 if (!strcmp(buf, "tcp") || buf[0] == '\0') {
457 } else if (!strcmp(buf, "udp")) {
463 if (!legacy_format) {
464 if (get_str_sep(buf, sizeof(buf), &p, ':') < 0) {
467 if (buf[0] != '\0' && !inet_aton(buf, &host_addr)) {
472 if (get_str_sep(buf, sizeof(buf), &p, legacy_format ? ':' : '-') < 0) {
475 host_port = strtol(buf, &end, 0);
476 if (*end != '\0' || host_port < 1 || host_port > 65535) {
480 if (get_str_sep(buf, sizeof(buf), &p, ':') < 0) {
483 if (buf[0] != '\0' && !inet_aton(buf, &guest_addr)) {
487 guest_port = strtol(p, &end, 0);
488 if (*end != '\0' || guest_port < 1 || guest_port > 65535) {
492 if (slirp_add_hostfwd(s->slirp, is_udp, host_addr, host_port, guest_addr,
494 error_report("could not set up host forwarding rule '%s'",
501 error_report("invalid host forwarding rule '%s'", redir_str);
505 void hmp_hostfwd_add(Monitor *mon, const QDict *qdict)
507 const char *redir_str;
509 const char *arg1 = qdict_get_str(qdict, "arg1");
510 const char *arg2 = qdict_get_try_str(qdict, "arg2");
511 const char *arg3 = qdict_get_try_str(qdict, "arg3");
514 s = slirp_lookup(mon, arg1, arg2);
517 s = slirp_lookup(mon, NULL, NULL);
521 slirp_hostfwd(s, redir_str, 0);
526 int net_slirp_redir(const char *redir_str)
528 struct slirp_config_str *config;
530 if (QTAILQ_EMPTY(&slirp_stacks)) {
531 config = g_malloc(sizeof(*config));
532 pstrcpy(config->str, sizeof(config->str), redir_str);
533 config->flags = SLIRP_CFG_HOSTFWD | SLIRP_CFG_LEGACY;
534 config->next = slirp_configs;
535 slirp_configs = config;
539 return slirp_hostfwd(QTAILQ_FIRST(&slirp_stacks), redir_str, 1);
544 /* automatic user mode samba server configuration */
545 static void slirp_smb_cleanup(SlirpState *s)
550 if (s->smb_dir[0] != '\0') {
551 snprintf(cmd, sizeof(cmd), "rm -rf %s", s->smb_dir);
553 if (ret == -1 || !WIFEXITED(ret)) {
554 error_report("'%s' failed.", cmd);
555 } else if (WEXITSTATUS(ret)) {
556 error_report("'%s' failed. Error code: %d",
557 cmd, WEXITSTATUS(ret));
559 s->smb_dir[0] = '\0';
563 static int slirp_smb(SlirpState* s, const char *exported_dir,
564 struct in_addr vserver_addr)
567 char smb_cmdline[128];
568 struct passwd *passwd;
571 passwd = getpwuid(geteuid());
573 error_report("failed to retrieve user name");
577 if (access(CONFIG_SMBD_COMMAND, F_OK)) {
578 error_report("could not find '%s', please install it",
579 CONFIG_SMBD_COMMAND);
583 if (access(exported_dir, R_OK | X_OK)) {
584 error_report("error accessing shared directory '%s': %s",
585 exported_dir, strerror(errno));
589 snprintf(s->smb_dir, sizeof(s->smb_dir), "/tmp/qemu-smb.XXXXXX");
590 if (!mkdtemp(s->smb_dir)) {
591 error_report("could not create samba server dir '%s'", s->smb_dir);
595 snprintf(smb_conf, sizeof(smb_conf), "%s/%s", s->smb_dir, "smb.conf");
597 f = fopen(smb_conf, "w");
599 slirp_smb_cleanup(s);
600 error_report("could not create samba server configuration file '%s'",
607 "interfaces=127.0.0.1\n"
608 "bind interfaces only=yes\n"
610 "lock directory=%s\n"
611 "state directory=%s\n"
612 "cache directory=%s\n"
613 "ncalrpc dir=%s/ncalrpc\n"
614 "log file=%s/log.smbd\n"
615 "smb passwd file=%s/smbpasswd\n"
617 "map to guest = Bad User\n"
618 "load printers = no\n"
620 "disable spoolss = yes\n"
621 "usershare max shares = 0\n"
640 snprintf(smb_cmdline, sizeof(smb_cmdline), "%s -l %s -s %s",
641 CONFIG_SMBD_COMMAND, s->smb_dir, smb_conf);
643 if (slirp_add_exec(s->slirp, 0, smb_cmdline, &vserver_addr, 139) < 0 ||
644 slirp_add_exec(s->slirp, 0, smb_cmdline, &vserver_addr, 445) < 0) {
645 slirp_smb_cleanup(s);
646 error_report("conflicting/invalid smbserver address");
652 /* automatic user mode samba server configuration (legacy interface) */
653 int net_slirp_smb(const char *exported_dir)
655 struct in_addr vserver_addr = { .s_addr = 0 };
657 if (legacy_smb_export) {
658 fprintf(stderr, "-smb given twice\n");
661 legacy_smb_export = exported_dir;
662 if (!QTAILQ_EMPTY(&slirp_stacks)) {
663 return slirp_smb(QTAILQ_FIRST(&slirp_stacks), exported_dir,
669 #endif /* !defined(_WIN32) */
673 struct in_addr server;
678 static int guestfwd_can_read(void *opaque)
680 struct GuestFwd *fwd = opaque;
681 return slirp_socket_can_recv(fwd->slirp, fwd->server, fwd->port);
684 static void guestfwd_read(void *opaque, const uint8_t *buf, int size)
686 struct GuestFwd *fwd = opaque;
687 slirp_socket_recv(fwd->slirp, fwd->server, fwd->port, buf, size);
690 static int slirp_guestfwd(SlirpState *s, const char *config_str,
693 struct in_addr server = { .s_addr = 0 };
694 struct GuestFwd *fwd;
702 if (get_str_sep(buf, sizeof(buf), &p, ':') < 0) {
706 if (get_str_sep(buf, sizeof(buf), &p, ':') < 0) {
709 if (strcmp(buf, "tcp") && buf[0] != '\0') {
712 if (get_str_sep(buf, sizeof(buf), &p, ':') < 0) {
715 if (buf[0] != '\0' && !inet_aton(buf, &server)) {
718 if (get_str_sep(buf, sizeof(buf), &p, '-') < 0) {
722 port = strtol(buf, &end, 10);
723 if (*end != '\0' || port < 1 || port > 65535) {
727 snprintf(buf, sizeof(buf), "guestfwd.tcp.%d", port);
729 if ((strlen(p) > 4) && !strncmp(p, "cmd:", 4)) {
730 if (slirp_add_exec(s->slirp, 0, &p[4], &server, port) < 0) {
731 error_report("conflicting/invalid host:port in guest forwarding "
732 "rule '%s'", config_str);
736 fwd = g_new(struct GuestFwd, 1);
737 fwd->hd = qemu_chr_new(buf, p, NULL);
739 error_report("could not open guest forwarding device '%s'", buf);
744 if (slirp_add_exec(s->slirp, 3, fwd->hd, &server, port) < 0) {
745 error_report("conflicting/invalid host:port in guest forwarding "
746 "rule '%s'", config_str);
750 fwd->server = server;
752 fwd->slirp = s->slirp;
754 qemu_chr_fe_claim_no_fail(fwd->hd);
755 qemu_chr_add_handlers(fwd->hd, guestfwd_can_read, guestfwd_read,
761 error_report("invalid guest forwarding rule '%s'", config_str);
765 void hmp_info_usernet(Monitor *mon, const QDict *qdict)
769 QTAILQ_FOREACH(s, &slirp_stacks, entry) {
771 bool got_vlan_id = net_hub_id_for_client(&s->nc, &id) == 0;
772 monitor_printf(mon, "VLAN %d (%s):\n",
773 got_vlan_id ? id : -1,
775 slirp_connection_info(s->slirp, mon);
780 net_init_slirp_configs(const StringList *fwd, int flags)
783 struct slirp_config_str *config;
785 config = g_malloc0(sizeof(*config));
786 pstrcpy(config->str, sizeof(config->str), fwd->value->str);
787 config->flags = flags;
788 config->next = slirp_configs;
789 slirp_configs = config;
795 static const char **slirp_dnssearch(const StringList *dnsname)
797 const StringList *c = dnsname;
798 size_t i = 0, num_opts = 0;
810 ret = g_malloc((num_opts + 1) * sizeof(*ret));
813 ret[i++] = c->value->str;
820 int net_init_slirp(const NetClientOptions *opts, const char *name,
821 NetClientState *peer, Error **errp)
823 /* FIXME error_setg(errp, ...) on failure */
824 struct slirp_config_str *config;
827 const NetdevUserOptions *user;
828 const char **dnssearch;
829 bool ipv4 = true, ipv6 = true;
831 assert(opts->type == NET_CLIENT_OPTIONS_KIND_USER);
832 user = opts->u.user.data;
834 if ((user->has_ipv6 && user->ipv6 && !user->has_ipv4) ||
835 (user->has_ipv4 && !user->ipv4)) {
838 if ((user->has_ipv4 && user->ipv4 && !user->has_ipv6) ||
839 (user->has_ipv6 && !user->ipv6)) {
843 vnet = user->has_net ? g_strdup(user->net) :
844 user->has_ip ? g_strdup_printf("%s/24", user->ip) :
847 dnssearch = slirp_dnssearch(user->dnssearch);
849 /* all optional fields are initialized to "all bits zero" */
851 net_init_slirp_configs(user->hostfwd, SLIRP_CFG_HOSTFWD);
852 net_init_slirp_configs(user->guestfwd, 0);
854 ret = net_slirp_init(peer, "user", name, user->q_restrict,
855 ipv4, vnet, user->host,
856 ipv6, user->ipv6_prefix, user->ipv6_prefixlen,
857 user->ipv6_host, user->hostname, user->tftp,
858 user->bootfile, user->dhcpstart,
859 user->dns, user->ipv6_dns, user->smb,
860 user->smbserver, dnssearch);
862 while (slirp_configs) {
863 config = slirp_configs;
864 slirp_configs = config->next;
874 int net_slirp_parse_legacy(QemuOptsList *opts_list, const char *optarg, int *ret)
876 if (strcmp(opts_list->name, "net") != 0 ||
877 strncmp(optarg, "channel,", strlen("channel,")) != 0) {
881 error_report("The '-net channel' option is deprecated. "
882 "Please use '-netdev user,guestfwd=...' instead.");
884 /* handle legacy -net channel,port:chr */
885 optarg += strlen("channel,");
887 if (QTAILQ_EMPTY(&slirp_stacks)) {
888 struct slirp_config_str *config;
890 config = g_malloc(sizeof(*config));
891 pstrcpy(config->str, sizeof(config->str), optarg);
892 config->flags = SLIRP_CFG_LEGACY;
893 config->next = slirp_configs;
894 slirp_configs = config;
897 *ret = slirp_guestfwd(QTAILQ_FIRST(&slirp_stacks), optarg, 1);