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