trap signals for "-serial mon:stdio"
[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 "net/slirp.h"
25
26 #include "config-host.h"
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/sockets.h"
37 #include "slirp/libslirp.h"
38 #include "sysemu/char.h"
39
40 static int get_str_sep(char *buf, int buf_size, const char **pp, int sep)
41 {
42 const char *p, *p1;
43 int len;
44 p = *pp;
45 p1 = strchr(p, sep);
46 if (!p1)
47 return -1;
48 len = p1 - p;
49 p1++;
50 if (buf_size > 0) {
51 if (len > buf_size - 1)
52 len = buf_size - 1;
53 memcpy(buf, p, len);
54 buf[len] = '\0';
55 }
56 *pp = p1;
57 return 0;
58 }
59
60 /* slirp network adapter */
61
62 #define SLIRP_CFG_HOSTFWD 1
63 #define SLIRP_CFG_LEGACY 2
64
65 struct slirp_config_str {
66 struct slirp_config_str *next;
67 int flags;
68 char str[1024];
69 int legacy_format;
70 };
71
72 typedef struct SlirpState {
73 NetClientState nc;
74 QTAILQ_ENTRY(SlirpState) entry;
75 Slirp *slirp;
76 #ifndef _WIN32
77 char smb_dir[128];
78 #endif
79 } SlirpState;
80
81 static struct slirp_config_str *slirp_configs;
82 const char *legacy_tftp_prefix;
83 const char *legacy_bootp_filename;
84 static QTAILQ_HEAD(slirp_stacks, SlirpState) slirp_stacks =
85 QTAILQ_HEAD_INITIALIZER(slirp_stacks);
86
87 static int slirp_hostfwd(SlirpState *s, const char *redir_str,
88 int legacy_format);
89 static int slirp_guestfwd(SlirpState *s, const char *config_str,
90 int legacy_format);
91
92 #ifndef _WIN32
93 static const char *legacy_smb_export;
94
95 static int slirp_smb(SlirpState *s, const char *exported_dir,
96 struct in_addr vserver_addr);
97 static void slirp_smb_cleanup(SlirpState *s);
98 #else
99 static inline void slirp_smb_cleanup(SlirpState *s) { }
100 #endif
101
102 void slirp_output(void *opaque, const uint8_t *pkt, int pkt_len)
103 {
104 SlirpState *s = opaque;
105
106 qemu_send_packet(&s->nc, pkt, pkt_len);
107 }
108
109 static ssize_t net_slirp_receive(NetClientState *nc, const uint8_t *buf, size_t size)
110 {
111 SlirpState *s = DO_UPCAST(SlirpState, nc, nc);
112
113 slirp_input(s->slirp, buf, size);
114
115 return size;
116 }
117
118 static void net_slirp_cleanup(NetClientState *nc)
119 {
120 SlirpState *s = DO_UPCAST(SlirpState, nc, nc);
121
122 slirp_cleanup(s->slirp);
123 slirp_smb_cleanup(s);
124 QTAILQ_REMOVE(&slirp_stacks, s, entry);
125 }
126
127 static NetClientInfo net_slirp_info = {
128 .type = NET_CLIENT_OPTIONS_KIND_USER,
129 .size = sizeof(SlirpState),
130 .receive = net_slirp_receive,
131 .cleanup = net_slirp_cleanup,
132 };
133
134 static int net_slirp_init(NetClientState *peer, const char *model,
135 const char *name, int restricted,
136 const char *vnetwork, const char *vhost,
137 const char *vhostname, const char *tftp_export,
138 const char *bootfile, const char *vdhcp_start,
139 const char *vnameserver, const char *smb_export,
140 const char *vsmbserver, const char **dnssearch)
141 {
142 /* default settings according to historic slirp */
143 struct in_addr net = { .s_addr = htonl(0x0a000200) }; /* 10.0.2.0 */
144 struct in_addr mask = { .s_addr = htonl(0xffffff00) }; /* 255.255.255.0 */
145 struct in_addr host = { .s_addr = htonl(0x0a000202) }; /* 10.0.2.2 */
146 struct in_addr dhcp = { .s_addr = htonl(0x0a00020f) }; /* 10.0.2.15 */
147 struct in_addr dns = { .s_addr = htonl(0x0a000203) }; /* 10.0.2.3 */
148 #ifndef _WIN32
149 struct in_addr smbsrv = { .s_addr = 0 };
150 #endif
151 NetClientState *nc;
152 SlirpState *s;
153 char buf[20];
154 uint32_t addr;
155 int shift;
156 char *end;
157 struct slirp_config_str *config;
158
159 if (!tftp_export) {
160 tftp_export = legacy_tftp_prefix;
161 }
162 if (!bootfile) {
163 bootfile = legacy_bootp_filename;
164 }
165
166 if (vnetwork) {
167 if (get_str_sep(buf, sizeof(buf), &vnetwork, '/') < 0) {
168 if (!inet_aton(vnetwork, &net)) {
169 return -1;
170 }
171 addr = ntohl(net.s_addr);
172 if (!(addr & 0x80000000)) {
173 mask.s_addr = htonl(0xff000000); /* class A */
174 } else if ((addr & 0xfff00000) == 0xac100000) {
175 mask.s_addr = htonl(0xfff00000); /* priv. 172.16.0.0/12 */
176 } else if ((addr & 0xc0000000) == 0x80000000) {
177 mask.s_addr = htonl(0xffff0000); /* class B */
178 } else if ((addr & 0xffff0000) == 0xc0a80000) {
179 mask.s_addr = htonl(0xffff0000); /* priv. 192.168.0.0/16 */
180 } else if ((addr & 0xffff0000) == 0xc6120000) {
181 mask.s_addr = htonl(0xfffe0000); /* tests 198.18.0.0/15 */
182 } else if ((addr & 0xe0000000) == 0xe0000000) {
183 mask.s_addr = htonl(0xffffff00); /* class C */
184 } else {
185 mask.s_addr = htonl(0xfffffff0); /* multicast/reserved */
186 }
187 } else {
188 if (!inet_aton(buf, &net)) {
189 return -1;
190 }
191 shift = strtol(vnetwork, &end, 10);
192 if (*end != '\0') {
193 if (!inet_aton(vnetwork, &mask)) {
194 return -1;
195 }
196 } else if (shift < 4 || shift > 32) {
197 return -1;
198 } else {
199 mask.s_addr = htonl(0xffffffff << (32 - shift));
200 }
201 }
202 net.s_addr &= mask.s_addr;
203 host.s_addr = net.s_addr | (htonl(0x0202) & ~mask.s_addr);
204 dhcp.s_addr = net.s_addr | (htonl(0x020f) & ~mask.s_addr);
205 dns.s_addr = net.s_addr | (htonl(0x0203) & ~mask.s_addr);
206 }
207
208 if (vhost && !inet_aton(vhost, &host)) {
209 return -1;
210 }
211 if ((host.s_addr & mask.s_addr) != net.s_addr) {
212 return -1;
213 }
214
215 if (vnameserver && !inet_aton(vnameserver, &dns)) {
216 return -1;
217 }
218 if ((dns.s_addr & mask.s_addr) != net.s_addr ||
219 dns.s_addr == host.s_addr) {
220 return -1;
221 }
222
223 if (vdhcp_start && !inet_aton(vdhcp_start, &dhcp)) {
224 return -1;
225 }
226 if ((dhcp.s_addr & mask.s_addr) != net.s_addr ||
227 dhcp.s_addr == host.s_addr || dhcp.s_addr == dns.s_addr) {
228 return -1;
229 }
230
231 #ifndef _WIN32
232 if (vsmbserver && !inet_aton(vsmbserver, &smbsrv)) {
233 return -1;
234 }
235 #endif
236
237 nc = qemu_new_net_client(&net_slirp_info, peer, model, name);
238
239 snprintf(nc->info_str, sizeof(nc->info_str),
240 "net=%s,restrict=%s", inet_ntoa(net),
241 restricted ? "on" : "off");
242
243 s = DO_UPCAST(SlirpState, nc, nc);
244
245 s->slirp = slirp_init(restricted, net, mask, host, vhostname,
246 tftp_export, bootfile, dhcp, dns, dnssearch, s);
247 QTAILQ_INSERT_TAIL(&slirp_stacks, s, entry);
248
249 for (config = slirp_configs; config; config = config->next) {
250 if (config->flags & SLIRP_CFG_HOSTFWD) {
251 if (slirp_hostfwd(s, config->str,
252 config->flags & SLIRP_CFG_LEGACY) < 0)
253 goto error;
254 } else {
255 if (slirp_guestfwd(s, config->str,
256 config->flags & SLIRP_CFG_LEGACY) < 0)
257 goto error;
258 }
259 }
260 #ifndef _WIN32
261 if (!smb_export) {
262 smb_export = legacy_smb_export;
263 }
264 if (smb_export) {
265 if (slirp_smb(s, smb_export, smbsrv) < 0)
266 goto error;
267 }
268 #endif
269
270 return 0;
271
272 error:
273 qemu_del_net_client(nc);
274 return -1;
275 }
276
277 static SlirpState *slirp_lookup(Monitor *mon, const char *vlan,
278 const char *stack)
279 {
280
281 if (vlan) {
282 NetClientState *nc;
283 nc = net_hub_find_client_by_name(strtol(vlan, NULL, 0), stack);
284 if (!nc) {
285 return NULL;
286 }
287 if (strcmp(nc->model, "user")) {
288 monitor_printf(mon, "invalid device specified\n");
289 return NULL;
290 }
291 return DO_UPCAST(SlirpState, nc, nc);
292 } else {
293 if (QTAILQ_EMPTY(&slirp_stacks)) {
294 monitor_printf(mon, "user mode network stack not in use\n");
295 return NULL;
296 }
297 return QTAILQ_FIRST(&slirp_stacks);
298 }
299 }
300
301 void net_slirp_hostfwd_remove(Monitor *mon, const QDict *qdict)
302 {
303 struct in_addr host_addr = { .s_addr = INADDR_ANY };
304 int host_port;
305 char buf[256];
306 const char *src_str, *p;
307 SlirpState *s;
308 int is_udp = 0;
309 int err;
310 const char *arg1 = qdict_get_str(qdict, "arg1");
311 const char *arg2 = qdict_get_try_str(qdict, "arg2");
312 const char *arg3 = qdict_get_try_str(qdict, "arg3");
313
314 if (arg2) {
315 s = slirp_lookup(mon, arg1, arg2);
316 src_str = arg3;
317 } else {
318 s = slirp_lookup(mon, NULL, NULL);
319 src_str = arg1;
320 }
321 if (!s) {
322 return;
323 }
324
325 p = src_str;
326 if (!p || get_str_sep(buf, sizeof(buf), &p, ':') < 0) {
327 goto fail_syntax;
328 }
329
330 if (!strcmp(buf, "tcp") || buf[0] == '\0') {
331 is_udp = 0;
332 } else if (!strcmp(buf, "udp")) {
333 is_udp = 1;
334 } else {
335 goto fail_syntax;
336 }
337
338 if (get_str_sep(buf, sizeof(buf), &p, ':') < 0) {
339 goto fail_syntax;
340 }
341 if (buf[0] != '\0' && !inet_aton(buf, &host_addr)) {
342 goto fail_syntax;
343 }
344
345 host_port = atoi(p);
346
347 err = slirp_remove_hostfwd(QTAILQ_FIRST(&slirp_stacks)->slirp, is_udp,
348 host_addr, host_port);
349
350 monitor_printf(mon, "host forwarding rule for %s %s\n", src_str,
351 err ? "not found" : "removed");
352 return;
353
354 fail_syntax:
355 monitor_printf(mon, "invalid format\n");
356 }
357
358 static int slirp_hostfwd(SlirpState *s, const char *redir_str,
359 int legacy_format)
360 {
361 struct in_addr host_addr = { .s_addr = INADDR_ANY };
362 struct in_addr guest_addr = { .s_addr = 0 };
363 int host_port, guest_port;
364 const char *p;
365 char buf[256];
366 int is_udp;
367 char *end;
368
369 p = redir_str;
370 if (!p || get_str_sep(buf, sizeof(buf), &p, ':') < 0) {
371 goto fail_syntax;
372 }
373 if (!strcmp(buf, "tcp") || buf[0] == '\0') {
374 is_udp = 0;
375 } else if (!strcmp(buf, "udp")) {
376 is_udp = 1;
377 } else {
378 goto fail_syntax;
379 }
380
381 if (!legacy_format) {
382 if (get_str_sep(buf, sizeof(buf), &p, ':') < 0) {
383 goto fail_syntax;
384 }
385 if (buf[0] != '\0' && !inet_aton(buf, &host_addr)) {
386 goto fail_syntax;
387 }
388 }
389
390 if (get_str_sep(buf, sizeof(buf), &p, legacy_format ? ':' : '-') < 0) {
391 goto fail_syntax;
392 }
393 host_port = strtol(buf, &end, 0);
394 if (*end != '\0' || host_port < 1 || host_port > 65535) {
395 goto fail_syntax;
396 }
397
398 if (get_str_sep(buf, sizeof(buf), &p, ':') < 0) {
399 goto fail_syntax;
400 }
401 if (buf[0] != '\0' && !inet_aton(buf, &guest_addr)) {
402 goto fail_syntax;
403 }
404
405 guest_port = strtol(p, &end, 0);
406 if (*end != '\0' || guest_port < 1 || guest_port > 65535) {
407 goto fail_syntax;
408 }
409
410 if (slirp_add_hostfwd(s->slirp, is_udp, host_addr, host_port, guest_addr,
411 guest_port) < 0) {
412 error_report("could not set up host forwarding rule '%s'",
413 redir_str);
414 return -1;
415 }
416 return 0;
417
418 fail_syntax:
419 error_report("invalid host forwarding rule '%s'", redir_str);
420 return -1;
421 }
422
423 void net_slirp_hostfwd_add(Monitor *mon, const QDict *qdict)
424 {
425 const char *redir_str;
426 SlirpState *s;
427 const char *arg1 = qdict_get_str(qdict, "arg1");
428 const char *arg2 = qdict_get_try_str(qdict, "arg2");
429 const char *arg3 = qdict_get_try_str(qdict, "arg3");
430
431 if (arg2) {
432 s = slirp_lookup(mon, arg1, arg2);
433 redir_str = arg3;
434 } else {
435 s = slirp_lookup(mon, NULL, NULL);
436 redir_str = arg1;
437 }
438 if (s) {
439 slirp_hostfwd(s, redir_str, 0);
440 }
441
442 }
443
444 int net_slirp_redir(const char *redir_str)
445 {
446 struct slirp_config_str *config;
447
448 if (QTAILQ_EMPTY(&slirp_stacks)) {
449 config = g_malloc(sizeof(*config));
450 pstrcpy(config->str, sizeof(config->str), redir_str);
451 config->flags = SLIRP_CFG_HOSTFWD | SLIRP_CFG_LEGACY;
452 config->next = slirp_configs;
453 slirp_configs = config;
454 return 0;
455 }
456
457 return slirp_hostfwd(QTAILQ_FIRST(&slirp_stacks), redir_str, 1);
458 }
459
460 #ifndef _WIN32
461
462 /* automatic user mode samba server configuration */
463 static void slirp_smb_cleanup(SlirpState *s)
464 {
465 char cmd[128];
466 int ret;
467
468 if (s->smb_dir[0] != '\0') {
469 snprintf(cmd, sizeof(cmd), "rm -rf %s", s->smb_dir);
470 ret = system(cmd);
471 if (ret == -1 || !WIFEXITED(ret)) {
472 error_report("'%s' failed.", cmd);
473 } else if (WEXITSTATUS(ret)) {
474 error_report("'%s' failed. Error code: %d",
475 cmd, WEXITSTATUS(ret));
476 }
477 s->smb_dir[0] = '\0';
478 }
479 }
480
481 static int slirp_smb(SlirpState* s, const char *exported_dir,
482 struct in_addr vserver_addr)
483 {
484 static int instance;
485 char smb_conf[128];
486 char smb_cmdline[128];
487 struct passwd *passwd;
488 FILE *f;
489
490 passwd = getpwuid(geteuid());
491 if (!passwd) {
492 error_report("failed to retrieve user name");
493 return -1;
494 }
495
496 if (access(CONFIG_SMBD_COMMAND, F_OK)) {
497 error_report("could not find '%s', please install it",
498 CONFIG_SMBD_COMMAND);
499 return -1;
500 }
501
502 if (access(exported_dir, R_OK | X_OK)) {
503 error_report("error accessing shared directory '%s': %s",
504 exported_dir, strerror(errno));
505 return -1;
506 }
507
508 snprintf(s->smb_dir, sizeof(s->smb_dir), "/tmp/qemu-smb.%ld-%d",
509 (long)getpid(), instance++);
510 if (mkdir(s->smb_dir, 0700) < 0) {
511 error_report("could not create samba server dir '%s'", s->smb_dir);
512 return -1;
513 }
514 snprintf(smb_conf, sizeof(smb_conf), "%s/%s", s->smb_dir, "smb.conf");
515
516 f = fopen(smb_conf, "w");
517 if (!f) {
518 slirp_smb_cleanup(s);
519 error_report("could not create samba server configuration file '%s'",
520 smb_conf);
521 return -1;
522 }
523 fprintf(f,
524 "[global]\n"
525 "private dir=%s\n"
526 "socket address=127.0.0.1\n"
527 "pid directory=%s\n"
528 "lock directory=%s\n"
529 "state directory=%s\n"
530 "log file=%s/log.smbd\n"
531 "smb passwd file=%s/smbpasswd\n"
532 "security = share\n"
533 "[qemu]\n"
534 "path=%s\n"
535 "read only=no\n"
536 "guest ok=yes\n"
537 "force user=%s\n",
538 s->smb_dir,
539 s->smb_dir,
540 s->smb_dir,
541 s->smb_dir,
542 s->smb_dir,
543 s->smb_dir,
544 exported_dir,
545 passwd->pw_name
546 );
547 fclose(f);
548
549 snprintf(smb_cmdline, sizeof(smb_cmdline), "%s -s %s",
550 CONFIG_SMBD_COMMAND, smb_conf);
551
552 if (slirp_add_exec(s->slirp, 0, smb_cmdline, &vserver_addr, 139) < 0) {
553 slirp_smb_cleanup(s);
554 error_report("conflicting/invalid smbserver address");
555 return -1;
556 }
557 return 0;
558 }
559
560 /* automatic user mode samba server configuration (legacy interface) */
561 int net_slirp_smb(const char *exported_dir)
562 {
563 struct in_addr vserver_addr = { .s_addr = 0 };
564
565 if (legacy_smb_export) {
566 fprintf(stderr, "-smb given twice\n");
567 return -1;
568 }
569 legacy_smb_export = exported_dir;
570 if (!QTAILQ_EMPTY(&slirp_stacks)) {
571 return slirp_smb(QTAILQ_FIRST(&slirp_stacks), exported_dir,
572 vserver_addr);
573 }
574 return 0;
575 }
576
577 #endif /* !defined(_WIN32) */
578
579 struct GuestFwd {
580 CharDriverState *hd;
581 struct in_addr server;
582 int port;
583 Slirp *slirp;
584 };
585
586 static int guestfwd_can_read(void *opaque)
587 {
588 struct GuestFwd *fwd = opaque;
589 return slirp_socket_can_recv(fwd->slirp, fwd->server, fwd->port);
590 }
591
592 static void guestfwd_read(void *opaque, const uint8_t *buf, int size)
593 {
594 struct GuestFwd *fwd = opaque;
595 slirp_socket_recv(fwd->slirp, fwd->server, fwd->port, buf, size);
596 }
597
598 static int slirp_guestfwd(SlirpState *s, const char *config_str,
599 int legacy_format)
600 {
601 struct in_addr server = { .s_addr = 0 };
602 struct GuestFwd *fwd;
603 const char *p;
604 char buf[128];
605 char *end;
606 int port;
607
608 p = config_str;
609 if (legacy_format) {
610 if (get_str_sep(buf, sizeof(buf), &p, ':') < 0) {
611 goto fail_syntax;
612 }
613 } else {
614 if (get_str_sep(buf, sizeof(buf), &p, ':') < 0) {
615 goto fail_syntax;
616 }
617 if (strcmp(buf, "tcp") && buf[0] != '\0') {
618 goto fail_syntax;
619 }
620 if (get_str_sep(buf, sizeof(buf), &p, ':') < 0) {
621 goto fail_syntax;
622 }
623 if (buf[0] != '\0' && !inet_aton(buf, &server)) {
624 goto fail_syntax;
625 }
626 if (get_str_sep(buf, sizeof(buf), &p, '-') < 0) {
627 goto fail_syntax;
628 }
629 }
630 port = strtol(buf, &end, 10);
631 if (*end != '\0' || port < 1 || port > 65535) {
632 goto fail_syntax;
633 }
634
635 fwd = g_malloc(sizeof(struct GuestFwd));
636 snprintf(buf, sizeof(buf), "guestfwd.tcp.%d", port);
637
638 if ((strlen(p) > 4) && !strncmp(p, "cmd:", 4)) {
639 if (slirp_add_exec(s->slirp, 0, &p[4], &server, port) < 0) {
640 error_report("conflicting/invalid host:port in guest forwarding "
641 "rule '%s'", config_str);
642 g_free(fwd);
643 return -1;
644 }
645 } else {
646 fwd->hd = qemu_chr_new(buf, p, NULL);
647 if (!fwd->hd) {
648 error_report("could not open guest forwarding device '%s'", buf);
649 g_free(fwd);
650 return -1;
651 }
652
653 if (slirp_add_exec(s->slirp, 3, fwd->hd, &server, port) < 0) {
654 error_report("conflicting/invalid host:port in guest forwarding "
655 "rule '%s'", config_str);
656 g_free(fwd);
657 return -1;
658 }
659 fwd->server = server;
660 fwd->port = port;
661 fwd->slirp = s->slirp;
662
663 qemu_chr_fe_claim_no_fail(fwd->hd);
664 qemu_chr_add_handlers(fwd->hd, guestfwd_can_read, guestfwd_read,
665 NULL, fwd);
666 }
667 return 0;
668
669 fail_syntax:
670 error_report("invalid guest forwarding rule '%s'", config_str);
671 return -1;
672 }
673
674 void do_info_usernet(Monitor *mon, const QDict *qdict)
675 {
676 SlirpState *s;
677
678 QTAILQ_FOREACH(s, &slirp_stacks, entry) {
679 int id;
680 bool got_vlan_id = net_hub_id_for_client(&s->nc, &id) == 0;
681 monitor_printf(mon, "VLAN %d (%s):\n",
682 got_vlan_id ? id : -1,
683 s->nc.name);
684 slirp_connection_info(s->slirp, mon);
685 }
686 }
687
688 static void
689 net_init_slirp_configs(const StringList *fwd, int flags)
690 {
691 while (fwd) {
692 struct slirp_config_str *config;
693
694 config = g_malloc0(sizeof(*config));
695 pstrcpy(config->str, sizeof(config->str), fwd->value->str);
696 config->flags = flags;
697 config->next = slirp_configs;
698 slirp_configs = config;
699
700 fwd = fwd->next;
701 }
702 }
703
704 static const char **slirp_dnssearch(const StringList *dnsname)
705 {
706 const StringList *c = dnsname;
707 size_t i = 0, num_opts = 0;
708 const char **ret;
709
710 while (c) {
711 num_opts++;
712 c = c->next;
713 }
714
715 if (num_opts == 0) {
716 return NULL;
717 }
718
719 ret = g_malloc((num_opts + 1) * sizeof(*ret));
720 c = dnsname;
721 while (c) {
722 ret[i++] = c->value->str;
723 c = c->next;
724 }
725 ret[i] = NULL;
726 return ret;
727 }
728
729 int net_init_slirp(const NetClientOptions *opts, const char *name,
730 NetClientState *peer)
731 {
732 struct slirp_config_str *config;
733 char *vnet;
734 int ret;
735 const NetdevUserOptions *user;
736 const char **dnssearch;
737
738 assert(opts->kind == NET_CLIENT_OPTIONS_KIND_USER);
739 user = opts->user;
740
741 vnet = user->has_net ? g_strdup(user->net) :
742 user->has_ip ? g_strdup_printf("%s/24", user->ip) :
743 NULL;
744
745 dnssearch = slirp_dnssearch(user->dnssearch);
746
747 /* all optional fields are initialized to "all bits zero" */
748
749 net_init_slirp_configs(user->hostfwd, SLIRP_CFG_HOSTFWD);
750 net_init_slirp_configs(user->guestfwd, 0);
751
752 ret = net_slirp_init(peer, "user", name, user->q_restrict, vnet,
753 user->host, user->hostname, user->tftp,
754 user->bootfile, user->dhcpstart, user->dns, user->smb,
755 user->smbserver, dnssearch);
756
757 while (slirp_configs) {
758 config = slirp_configs;
759 slirp_configs = config->next;
760 g_free(config);
761 }
762
763 g_free(vnet);
764 g_free(dnssearch);
765
766 return ret;
767 }
768
769 int net_slirp_parse_legacy(QemuOptsList *opts_list, const char *optarg, int *ret)
770 {
771 if (strcmp(opts_list->name, "net") != 0 ||
772 strncmp(optarg, "channel,", strlen("channel,")) != 0) {
773 return 0;
774 }
775
776 /* handle legacy -net channel,port:chr */
777 optarg += strlen("channel,");
778
779 if (QTAILQ_EMPTY(&slirp_stacks)) {
780 struct slirp_config_str *config;
781
782 config = g_malloc(sizeof(*config));
783 pstrcpy(config->str, sizeof(config->str), optarg);
784 config->flags = SLIRP_CFG_LEGACY;
785 config->next = slirp_configs;
786 slirp_configs = config;
787 *ret = 0;
788 } else {
789 *ret = slirp_guestfwd(QTAILQ_FIRST(&slirp_stacks), optarg, 1);
790 }
791
792 return 1;
793 }
794