xref: /illumos-kvm-cmd/net/slirp.c (revision 68396ea9)
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 <sys/wait.h>
30 #endif
31 #include "net.h"
32 #include "monitor.h"
33 #include "sysemu.h"
34 #include "qemu_socket.h"
35 #include "slirp/libslirp.h"
36 
get_str_sep(char * buf,int buf_size,const char ** pp,int sep)37 static int get_str_sep(char *buf, int buf_size, const char **pp, int sep)
38 {
39     const char *p, *p1;
40     int len;
41     p = *pp;
42     p1 = strchr(p, sep);
43     if (!p1)
44         return -1;
45     len = p1 - p;
46     p1++;
47     if (buf_size > 0) {
48         if (len > buf_size - 1)
49             len = buf_size - 1;
50         memcpy(buf, p, len);
51         buf[len] = '\0';
52     }
53     *pp = p1;
54     return 0;
55 }
56 
57 /* slirp network adapter */
58 
59 #define SLIRP_CFG_HOSTFWD 1
60 #define SLIRP_CFG_LEGACY  2
61 
62 struct slirp_config_str {
63     struct slirp_config_str *next;
64     int flags;
65     char str[1024];
66     int legacy_format;
67 };
68 
69 typedef struct SlirpState {
70     VLANClientState nc;
71     QTAILQ_ENTRY(SlirpState) entry;
72     Slirp *slirp;
73 #ifndef _WIN32
74     char smb_dir[128];
75 #endif
76 } SlirpState;
77 
78 static struct slirp_config_str *slirp_configs;
79 const char *legacy_tftp_prefix;
80 const char *legacy_bootp_filename;
81 static QTAILQ_HEAD(slirp_stacks, SlirpState) slirp_stacks =
82     QTAILQ_HEAD_INITIALIZER(slirp_stacks);
83 
84 static int slirp_hostfwd(SlirpState *s, const char *redir_str,
85                          int legacy_format);
86 static int slirp_guestfwd(SlirpState *s, const char *config_str,
87                           int legacy_format);
88 
89 #ifndef _WIN32
90 static const char *legacy_smb_export;
91 
92 static int slirp_smb(SlirpState *s, const char *exported_dir,
93                      struct in_addr vserver_addr);
94 static void slirp_smb_cleanup(SlirpState *s);
95 #else
slirp_smb_cleanup(SlirpState * s)96 static inline void slirp_smb_cleanup(SlirpState *s) { }
97 #endif
98 
slirp_can_output(void * opaque)99 int slirp_can_output(void *opaque)
100 {
101     SlirpState *s = opaque;
102 
103     return qemu_can_send_packet(&s->nc);
104 }
105 
slirp_output(void * opaque,const uint8_t * pkt,int pkt_len)106 void slirp_output(void *opaque, const uint8_t *pkt, int pkt_len)
107 {
108     SlirpState *s = opaque;
109 
110     qemu_send_packet(&s->nc, pkt, pkt_len);
111 }
112 
net_slirp_receive(VLANClientState * nc,const uint8_t * buf,size_t size)113 static ssize_t net_slirp_receive(VLANClientState *nc, const uint8_t *buf, size_t size)
114 {
115     SlirpState *s = DO_UPCAST(SlirpState, nc, nc);
116 
117     slirp_input(s->slirp, buf, size);
118 
119     return size;
120 }
121 
net_slirp_cleanup(VLANClientState * nc)122 static void net_slirp_cleanup(VLANClientState *nc)
123 {
124     SlirpState *s = DO_UPCAST(SlirpState, nc, nc);
125 
126     slirp_cleanup(s->slirp);
127     slirp_smb_cleanup(s);
128     QTAILQ_REMOVE(&slirp_stacks, s, entry);
129 }
130 
131 static NetClientInfo net_slirp_info = {
132     .type = NET_CLIENT_TYPE_SLIRP,
133     .size = sizeof(SlirpState),
134     .receive = net_slirp_receive,
135     .cleanup = net_slirp_cleanup,
136 };
137 
net_slirp_init(VLANState * vlan,const char * model,const char * name,int restricted,const char * vnetwork,const char * vhost,const char * vhostname,const char * tftp_export,const char * bootfile,const char * vdhcp_start,const char * vnameserver,const char * smb_export,const char * vsmbserver)138 static int net_slirp_init(VLANState *vlan, const char *model,
139                           const char *name, int restricted,
140                           const char *vnetwork, const char *vhost,
141                           const char *vhostname, const char *tftp_export,
142                           const char *bootfile, const char *vdhcp_start,
143                           const char *vnameserver, const char *smb_export,
144                           const char *vsmbserver)
145 {
146     /* default settings according to historic slirp */
147     struct in_addr net  = { .s_addr = htonl(0x0a000200) }; /* 10.0.2.0 */
148     struct in_addr mask = { .s_addr = htonl(0xffffff00) }; /* 255.255.255.0 */
149     struct in_addr host = { .s_addr = htonl(0x0a000202) }; /* 10.0.2.2 */
150     struct in_addr dhcp = { .s_addr = htonl(0x0a00020f) }; /* 10.0.2.15 */
151     struct in_addr dns  = { .s_addr = htonl(0x0a000203) }; /* 10.0.2.3 */
152 #ifndef _WIN32
153     struct in_addr smbsrv = { .s_addr = 0 };
154 #endif
155     VLANClientState *nc;
156     SlirpState *s;
157     char buf[20];
158     uint32_t addr;
159     int shift;
160     char *end;
161     struct slirp_config_str *config;
162 
163     if (!tftp_export) {
164         tftp_export = legacy_tftp_prefix;
165     }
166     if (!bootfile) {
167         bootfile = legacy_bootp_filename;
168     }
169 
170     if (vnetwork) {
171         if (get_str_sep(buf, sizeof(buf), &vnetwork, '/') < 0) {
172             if (!inet_aton(vnetwork, &net)) {
173                 return -1;
174             }
175             addr = ntohl(net.s_addr);
176             if (!(addr & 0x80000000)) {
177                 mask.s_addr = htonl(0xff000000); /* class A */
178             } else if ((addr & 0xfff00000) == 0xac100000) {
179                 mask.s_addr = htonl(0xfff00000); /* priv. 172.16.0.0/12 */
180             } else if ((addr & 0xc0000000) == 0x80000000) {
181                 mask.s_addr = htonl(0xffff0000); /* class B */
182             } else if ((addr & 0xffff0000) == 0xc0a80000) {
183                 mask.s_addr = htonl(0xffff0000); /* priv. 192.168.0.0/16 */
184             } else if ((addr & 0xffff0000) == 0xc6120000) {
185                 mask.s_addr = htonl(0xfffe0000); /* tests 198.18.0.0/15 */
186             } else if ((addr & 0xe0000000) == 0xe0000000) {
187                 mask.s_addr = htonl(0xffffff00); /* class C */
188             } else {
189                 mask.s_addr = htonl(0xfffffff0); /* multicast/reserved */
190             }
191         } else {
192             if (!inet_aton(buf, &net)) {
193                 return -1;
194             }
195             shift = strtol(vnetwork, &end, 10);
196             if (*end != '\0') {
197                 if (!inet_aton(vnetwork, &mask)) {
198                     return -1;
199                 }
200             } else if (shift < 4 || shift > 32) {
201                 return -1;
202             } else {
203                 mask.s_addr = htonl(0xffffffff << (32 - shift));
204             }
205         }
206         net.s_addr &= mask.s_addr;
207         host.s_addr = net.s_addr | (htonl(0x0202) & ~mask.s_addr);
208         dhcp.s_addr = net.s_addr | (htonl(0x020f) & ~mask.s_addr);
209         dns.s_addr  = net.s_addr | (htonl(0x0203) & ~mask.s_addr);
210     }
211 
212     if (vhost && !inet_aton(vhost, &host)) {
213         return -1;
214     }
215     if ((host.s_addr & mask.s_addr) != net.s_addr) {
216         return -1;
217     }
218 
219     if (vdhcp_start && !inet_aton(vdhcp_start, &dhcp)) {
220         return -1;
221     }
222     if ((dhcp.s_addr & mask.s_addr) != net.s_addr ||
223         dhcp.s_addr == host.s_addr || dhcp.s_addr == dns.s_addr) {
224         return -1;
225     }
226 
227     if (vnameserver && !inet_aton(vnameserver, &dns)) {
228         return -1;
229     }
230     if ((dns.s_addr & mask.s_addr) != net.s_addr ||
231         dns.s_addr == host.s_addr) {
232         return -1;
233     }
234 
235 #ifndef _WIN32
236     if (vsmbserver && !inet_aton(vsmbserver, &smbsrv)) {
237         return -1;
238     }
239 #endif
240 
241     nc = qemu_new_net_client(&net_slirp_info, vlan, NULL, model, name);
242 
243     snprintf(nc->info_str, sizeof(nc->info_str),
244              "net=%s, restricted=%c", inet_ntoa(net), restricted ? 'y' : 'n');
245 
246     s = DO_UPCAST(SlirpState, nc, nc);
247 
248     s->slirp = slirp_init(restricted, net, mask, host, vhostname,
249                           tftp_export, bootfile, dhcp, dns, s);
250     QTAILQ_INSERT_TAIL(&slirp_stacks, s, entry);
251 
252     for (config = slirp_configs; config; config = config->next) {
253         if (config->flags & SLIRP_CFG_HOSTFWD) {
254             if (slirp_hostfwd(s, config->str,
255                               config->flags & SLIRP_CFG_LEGACY) < 0)
256                 goto error;
257         } else {
258             if (slirp_guestfwd(s, config->str,
259                                config->flags & SLIRP_CFG_LEGACY) < 0)
260                 goto error;
261         }
262     }
263 #ifndef _WIN32
264     if (!smb_export) {
265         smb_export = legacy_smb_export;
266     }
267     if (smb_export) {
268         if (slirp_smb(s, smb_export, smbsrv) < 0)
269             goto error;
270     }
271 #endif
272 
273     return 0;
274 
275 error:
276     qemu_del_vlan_client(nc);
277     return -1;
278 }
279 
slirp_lookup(Monitor * mon,const char * vlan,const char * stack)280 static SlirpState *slirp_lookup(Monitor *mon, const char *vlan,
281                                 const char *stack)
282 {
283 
284     if (vlan) {
285         VLANClientState *nc;
286         nc = qemu_find_vlan_client_by_name(mon, strtol(vlan, NULL, 0), stack);
287         if (!nc) {
288             return NULL;
289         }
290         if (strcmp(nc->model, "user")) {
291             monitor_printf(mon, "invalid device specified\n");
292             return NULL;
293         }
294         return DO_UPCAST(SlirpState, nc, nc);
295     } else {
296         if (QTAILQ_EMPTY(&slirp_stacks)) {
297             monitor_printf(mon, "user mode network stack not in use\n");
298             return NULL;
299         }
300         return QTAILQ_FIRST(&slirp_stacks);
301     }
302 }
303 
net_slirp_hostfwd_remove(Monitor * mon,const QDict * qdict)304 void net_slirp_hostfwd_remove(Monitor *mon, const QDict *qdict)
305 {
306     struct in_addr host_addr = { .s_addr = INADDR_ANY };
307     int host_port;
308     char buf[256] = "";
309     const char *src_str, *p;
310     SlirpState *s;
311     int is_udp = 0;
312     int err;
313     const char *arg1 = qdict_get_str(qdict, "arg1");
314     const char *arg2 = qdict_get_try_str(qdict, "arg2");
315     const char *arg3 = qdict_get_try_str(qdict, "arg3");
316 
317     if (arg2) {
318         s = slirp_lookup(mon, arg1, arg2);
319         src_str = arg3;
320     } else {
321         s = slirp_lookup(mon, NULL, NULL);
322         src_str = arg1;
323     }
324     if (!s) {
325         return;
326     }
327 
328     if (!src_str || !src_str[0])
329         goto fail_syntax;
330 
331     p = src_str;
332     get_str_sep(buf, sizeof(buf), &p, ':');
333 
334     if (!strcmp(buf, "tcp") || buf[0] == '\0') {
335         is_udp = 0;
336     } else if (!strcmp(buf, "udp")) {
337         is_udp = 1;
338     } else {
339         goto fail_syntax;
340     }
341 
342     if (get_str_sep(buf, sizeof(buf), &p, ':') < 0) {
343         goto fail_syntax;
344     }
345     if (buf[0] != '\0' && !inet_aton(buf, &host_addr)) {
346         goto fail_syntax;
347     }
348 
349     host_port = atoi(p);
350 
351     err = slirp_remove_hostfwd(QTAILQ_FIRST(&slirp_stacks)->slirp, is_udp,
352                                host_addr, host_port);
353 
354     monitor_printf(mon, "host forwarding rule for %s %s\n", src_str,
355                    err ? "removed" : "not found");
356     return;
357 
358  fail_syntax:
359     monitor_printf(mon, "invalid format\n");
360 }
361 
slirp_hostfwd(SlirpState * s,const char * redir_str,int legacy_format)362 static int slirp_hostfwd(SlirpState *s, const char *redir_str,
363                          int legacy_format)
364 {
365     struct in_addr host_addr = { .s_addr = INADDR_ANY };
366     struct in_addr guest_addr = { .s_addr = 0 };
367     int host_port, guest_port;
368     const char *p;
369     char buf[256];
370     int is_udp;
371     char *end;
372 
373     p = redir_str;
374     if (!p || get_str_sep(buf, sizeof(buf), &p, ':') < 0) {
375         goto fail_syntax;
376     }
377     if (!strcmp(buf, "tcp") || buf[0] == '\0') {
378         is_udp = 0;
379     } else if (!strcmp(buf, "udp")) {
380         is_udp = 1;
381     } else {
382         goto fail_syntax;
383     }
384 
385     if (!legacy_format) {
386         if (get_str_sep(buf, sizeof(buf), &p, ':') < 0) {
387             goto fail_syntax;
388         }
389         if (buf[0] != '\0' && !inet_aton(buf, &host_addr)) {
390             goto fail_syntax;
391         }
392     }
393 
394     if (get_str_sep(buf, sizeof(buf), &p, legacy_format ? ':' : '-') < 0) {
395         goto fail_syntax;
396     }
397     host_port = strtol(buf, &end, 0);
398     if (*end != '\0' || host_port < 1 || host_port > 65535) {
399         goto fail_syntax;
400     }
401 
402     if (get_str_sep(buf, sizeof(buf), &p, ':') < 0) {
403         goto fail_syntax;
404     }
405     if (buf[0] != '\0' && !inet_aton(buf, &guest_addr)) {
406         goto fail_syntax;
407     }
408 
409     guest_port = strtol(p, &end, 0);
410     if (*end != '\0' || guest_port < 1 || guest_port > 65535) {
411         goto fail_syntax;
412     }
413 
414     if (slirp_add_hostfwd(s->slirp, is_udp, host_addr, host_port, guest_addr,
415                           guest_port) < 0) {
416         error_report("could not set up host forwarding rule '%s'",
417                      redir_str);
418         return -1;
419     }
420     return 0;
421 
422  fail_syntax:
423     error_report("invalid host forwarding rule '%s'", redir_str);
424     return -1;
425 }
426 
net_slirp_hostfwd_add(Monitor * mon,const QDict * qdict)427 void net_slirp_hostfwd_add(Monitor *mon, const QDict *qdict)
428 {
429     const char *redir_str;
430     SlirpState *s;
431     const char *arg1 = qdict_get_str(qdict, "arg1");
432     const char *arg2 = qdict_get_try_str(qdict, "arg2");
433     const char *arg3 = qdict_get_try_str(qdict, "arg3");
434 
435     if (arg2) {
436         s = slirp_lookup(mon, arg1, arg2);
437         redir_str = arg3;
438     } else {
439         s = slirp_lookup(mon, NULL, NULL);
440         redir_str = arg1;
441     }
442     if (s) {
443         slirp_hostfwd(s, redir_str, 0);
444     }
445 
446 }
447 
net_slirp_redir(const char * redir_str)448 int net_slirp_redir(const char *redir_str)
449 {
450     struct slirp_config_str *config;
451 
452     if (QTAILQ_EMPTY(&slirp_stacks)) {
453         config = qemu_malloc(sizeof(*config));
454         pstrcpy(config->str, sizeof(config->str), redir_str);
455         config->flags = SLIRP_CFG_HOSTFWD | SLIRP_CFG_LEGACY;
456         config->next = slirp_configs;
457         slirp_configs = config;
458         return 0;
459     }
460 
461     return slirp_hostfwd(QTAILQ_FIRST(&slirp_stacks), redir_str, 1);
462 }
463 
464 #ifndef _WIN32
465 
466 /* automatic user mode samba server configuration */
slirp_smb_cleanup(SlirpState * s)467 static void slirp_smb_cleanup(SlirpState *s)
468 {
469     char cmd[128];
470     int ret;
471 
472     if (s->smb_dir[0] != '\0') {
473         snprintf(cmd, sizeof(cmd), "rm -rf %s", s->smb_dir);
474         ret = system(cmd);
475         if (ret == -1 || !WIFEXITED(ret)) {
476             error_report("'%s' failed.", cmd);
477         } else if (WEXITSTATUS(ret)) {
478             error_report("'%s' failed. Error code: %d",
479                          cmd, WEXITSTATUS(ret));
480         }
481         s->smb_dir[0] = '\0';
482     }
483 }
484 
slirp_smb(SlirpState * s,const char * exported_dir,struct in_addr vserver_addr)485 static int slirp_smb(SlirpState* s, const char *exported_dir,
486                      struct in_addr vserver_addr)
487 {
488     static int instance;
489     char smb_conf[128];
490     char smb_cmdline[128];
491     FILE *f;
492 
493     snprintf(s->smb_dir, sizeof(s->smb_dir), "/tmp/qemu-smb.%ld-%d",
494              (long)getpid(), instance++);
495     if (mkdir(s->smb_dir, 0700) < 0) {
496         error_report("could not create samba server dir '%s'", s->smb_dir);
497         return -1;
498     }
499     snprintf(smb_conf, sizeof(smb_conf), "%s/%s", s->smb_dir, "smb.conf");
500 
501     f = fopen(smb_conf, "w");
502     if (!f) {
503         slirp_smb_cleanup(s);
504         error_report("could not create samba server configuration file '%s'",
505                      smb_conf);
506         return -1;
507     }
508     fprintf(f,
509             "[global]\n"
510             "private dir=%s\n"
511             "smb ports=0\n"
512             "socket address=127.0.0.1\n"
513             "pid directory=%s\n"
514             "lock directory=%s\n"
515             "log file=%s/log.smbd\n"
516             "smb passwd file=%s/smbpasswd\n"
517             "security = share\n"
518             "[qemu]\n"
519             "path=%s\n"
520             "read only=no\n"
521             "guest ok=yes\n",
522             s->smb_dir,
523             s->smb_dir,
524             s->smb_dir,
525             s->smb_dir,
526             s->smb_dir,
527             exported_dir
528             );
529     fclose(f);
530 
531     snprintf(smb_cmdline, sizeof(smb_cmdline), "%s -s %s",
532              SMBD_COMMAND, smb_conf);
533 
534     if (slirp_add_exec(s->slirp, 0, smb_cmdline, &vserver_addr, 139) < 0) {
535         slirp_smb_cleanup(s);
536         error_report("conflicting/invalid smbserver address");
537         return -1;
538     }
539     return 0;
540 }
541 
542 /* automatic user mode samba server configuration (legacy interface) */
net_slirp_smb(const char * exported_dir)543 int net_slirp_smb(const char *exported_dir)
544 {
545     struct in_addr vserver_addr = { .s_addr = 0 };
546 
547     if (legacy_smb_export) {
548         fprintf(stderr, "-smb given twice\n");
549         return -1;
550     }
551     legacy_smb_export = exported_dir;
552     if (!QTAILQ_EMPTY(&slirp_stacks)) {
553         return slirp_smb(QTAILQ_FIRST(&slirp_stacks), exported_dir,
554                          vserver_addr);
555     }
556     return 0;
557 }
558 
559 #endif /* !defined(_WIN32) */
560 
561 struct GuestFwd {
562     CharDriverState *hd;
563     struct in_addr server;
564     int port;
565     Slirp *slirp;
566 };
567 
guestfwd_can_read(void * opaque)568 static int guestfwd_can_read(void *opaque)
569 {
570     struct GuestFwd *fwd = opaque;
571     return slirp_socket_can_recv(fwd->slirp, fwd->server, fwd->port);
572 }
573 
guestfwd_read(void * opaque,const uint8_t * buf,int size)574 static void guestfwd_read(void *opaque, const uint8_t *buf, int size)
575 {
576     struct GuestFwd *fwd = opaque;
577     slirp_socket_recv(fwd->slirp, fwd->server, fwd->port, buf, size);
578 }
579 
slirp_guestfwd(SlirpState * s,const char * config_str,int legacy_format)580 static int slirp_guestfwd(SlirpState *s, const char *config_str,
581                           int legacy_format)
582 {
583     struct in_addr server = { .s_addr = 0 };
584     struct GuestFwd *fwd;
585     const char *p;
586     char buf[128];
587     char *end;
588     int port;
589 
590     p = config_str;
591     if (legacy_format) {
592         if (get_str_sep(buf, sizeof(buf), &p, ':') < 0) {
593             goto fail_syntax;
594         }
595     } else {
596         if (get_str_sep(buf, sizeof(buf), &p, ':') < 0) {
597             goto fail_syntax;
598         }
599         if (strcmp(buf, "tcp") && buf[0] != '\0') {
600             goto fail_syntax;
601         }
602         if (get_str_sep(buf, sizeof(buf), &p, ':') < 0) {
603             goto fail_syntax;
604         }
605         if (buf[0] != '\0' && !inet_aton(buf, &server)) {
606             goto fail_syntax;
607         }
608         if (get_str_sep(buf, sizeof(buf), &p, '-') < 0) {
609             goto fail_syntax;
610         }
611     }
612     port = strtol(buf, &end, 10);
613     if (*end != '\0' || port < 1 || port > 65535) {
614         goto fail_syntax;
615     }
616 
617     fwd = qemu_malloc(sizeof(struct GuestFwd));
618     snprintf(buf, sizeof(buf), "guestfwd.tcp:%d", port);
619     fwd->hd = qemu_chr_open(buf, p, NULL);
620     if (!fwd->hd) {
621         error_report("could not open guest forwarding device '%s'", buf);
622         qemu_free(fwd);
623         return -1;
624     }
625 
626     if (slirp_add_exec(s->slirp, 3, fwd->hd, &server, port) < 0) {
627         error_report("conflicting/invalid host:port in guest forwarding "
628                      "rule '%s'", config_str);
629         qemu_free(fwd);
630         return -1;
631     }
632     fwd->server = server;
633     fwd->port = port;
634     fwd->slirp = s->slirp;
635 
636     qemu_chr_add_handlers(fwd->hd, guestfwd_can_read, guestfwd_read,
637                           NULL, fwd);
638     return 0;
639 
640  fail_syntax:
641     error_report("invalid guest forwarding rule '%s'", config_str);
642     return -1;
643 }
644 
do_info_usernet(Monitor * mon)645 void do_info_usernet(Monitor *mon)
646 {
647     SlirpState *s;
648 
649     QTAILQ_FOREACH(s, &slirp_stacks, entry) {
650         monitor_printf(mon, "VLAN %d (%s):\n",
651                        s->nc.vlan ? s->nc.vlan->id : -1,
652                        s->nc.name);
653         slirp_connection_info(s->slirp, mon);
654     }
655 }
656 
net_init_slirp_configs(const char * name,const char * value,void * opaque)657 static int net_init_slirp_configs(const char *name, const char *value, void *opaque)
658 {
659     struct slirp_config_str *config;
660 
661     if (strcmp(name, "hostfwd") != 0 && strcmp(name, "guestfwd") != 0) {
662         return 0;
663     }
664 
665     config = qemu_mallocz(sizeof(*config));
666 
667     pstrcpy(config->str, sizeof(config->str), value);
668 
669     if (!strcmp(name, "hostfwd")) {
670         config->flags = SLIRP_CFG_HOSTFWD;
671     }
672 
673     config->next = slirp_configs;
674     slirp_configs = config;
675 
676     return 0;
677 }
678 
net_init_slirp(QemuOpts * opts,Monitor * mon,const char * name,VLANState * vlan)679 int net_init_slirp(QemuOpts *opts,
680                    Monitor *mon,
681                    const char *name,
682                    VLANState *vlan)
683 {
684     struct slirp_config_str *config;
685     const char *vhost;
686     const char *vhostname;
687     const char *vdhcp_start;
688     const char *vnamesrv;
689     const char *tftp_export;
690     const char *bootfile;
691     const char *smb_export;
692     const char *vsmbsrv;
693     char *vnet = NULL;
694     int restricted = 0;
695     int ret;
696 
697     vhost       = qemu_opt_get(opts, "host");
698     vhostname   = qemu_opt_get(opts, "hostname");
699     vdhcp_start = qemu_opt_get(opts, "dhcpstart");
700     vnamesrv    = qemu_opt_get(opts, "dns");
701     tftp_export = qemu_opt_get(opts, "tftp");
702     bootfile    = qemu_opt_get(opts, "bootfile");
703     smb_export  = qemu_opt_get(opts, "smb");
704     vsmbsrv     = qemu_opt_get(opts, "smbserver");
705 
706     if (qemu_opt_get(opts, "ip")) {
707         const char *ip = qemu_opt_get(opts, "ip");
708         int l = strlen(ip) + strlen("/24") + 1;
709 
710         vnet = qemu_malloc(l);
711 
712         /* emulate legacy ip= parameter */
713         pstrcpy(vnet, l, ip);
714         pstrcat(vnet, l, "/24");
715     }
716 
717     if (qemu_opt_get(opts, "net")) {
718         if (vnet) {
719             qemu_free(vnet);
720         }
721         vnet = qemu_strdup(qemu_opt_get(opts, "net"));
722     }
723 
724     if (qemu_opt_get(opts, "restrict") &&
725         qemu_opt_get(opts, "restrict")[0] == 'y') {
726         restricted = 1;
727     }
728 
729     qemu_opt_foreach(opts, net_init_slirp_configs, NULL, 0);
730 
731     ret = net_slirp_init(vlan, "user", name, restricted, vnet, vhost,
732                          vhostname, tftp_export, bootfile, vdhcp_start,
733                          vnamesrv, smb_export, vsmbsrv);
734 
735     while (slirp_configs) {
736         config = slirp_configs;
737         slirp_configs = config->next;
738         qemu_free(config);
739     }
740 
741     qemu_free(vnet);
742 
743     return ret;
744 }
745 
net_slirp_parse_legacy(QemuOptsList * opts_list,const char * optarg,int * ret)746 int net_slirp_parse_legacy(QemuOptsList *opts_list, const char *optarg, int *ret)
747 {
748     if (strcmp(opts_list->name, "net") != 0 ||
749         strncmp(optarg, "channel,", strlen("channel,")) != 0) {
750         return 0;
751     }
752 
753     /* handle legacy -net channel,port:chr */
754     optarg += strlen("channel,");
755 
756     if (QTAILQ_EMPTY(&slirp_stacks)) {
757         struct slirp_config_str *config;
758 
759         config = qemu_malloc(sizeof(*config));
760         pstrcpy(config->str, sizeof(config->str), optarg);
761         config->flags = SLIRP_CFG_LEGACY;
762         config->next = slirp_configs;
763         slirp_configs = config;
764         *ret = 0;
765     } else {
766         *ret = slirp_guestfwd(QTAILQ_FIRST(&slirp_stacks), optarg, 1);
767     }
768 
769     return 1;
770 }
771 
772