Commit | Line | Data |
---|---|---|
ce5c098f IJ |
1 | /* polypath |
2 | * send/receive module for secnet | |
3 | * for multi-route setups */ | |
4 | ||
5 | #include "secnet.h" | |
6 | #include "util.h" | |
7 | #include "unaligned.h" | |
8 | #include "comm-common.h" | |
9 | ||
10 | #include <adns.h> | |
11 | #include <ctype.h> | |
12 | ||
13 | #ifdef CONFIG_IPV6 | |
14 | ||
15 | static comm_sendmsg_fn polypath_sendmsg; | |
16 | ||
17 | struct interf { | |
18 | char *name; /* from malloc */ | |
19 | struct udpsocks socks; | |
20 | bool_t experienced_xmit_noaf[MAX_AF+1]; | |
21 | LIST_ENTRY(interf) entry; | |
22 | }; | |
23 | ||
24 | struct polypath { | |
25 | struct udpcommon uc; | |
26 | int max_interfs; | |
27 | const char *const *ifname_pats; | |
28 | const char *const *monitor_command; | |
29 | bool_t permit_loopback; | |
30 | LIST_HEAD(,interf) interfs; | |
31 | struct buffer_if lbuf; | |
32 | int monitor_fd; | |
33 | pid_t monitor_pid; | |
34 | }; | |
35 | ||
36 | #define LG 0, st->uc.cc.cl.description, &st->uc.cc.loc | |
37 | ||
38 | static const char *const default_loopback_ifname_pats[] = { | |
39 | "!lo", 0 | |
40 | }; | |
41 | static const char *const default_ifname_pats[] = { | |
42 | "!tun*","!tap*","!sl*","!userv*", "*", 0 | |
43 | }; | |
44 | ||
45 | static const char *const default_monitor_command[] = { | |
e61a41a4 IJ |
46 | #if __linux__ |
47 | DATAROOTDIR "/secnet/" "polypath-interface-monitor-linux", 0 | |
48 | #else | |
ce5c098f | 49 | 0 |
e61a41a4 | 50 | #endif |
ce5c098f IJ |
51 | }; |
52 | ||
53 | static const char *polypath_addr_to_string(void *commst, | |
54 | const struct comm_addr *ca) | |
55 | { | |
56 | static char sbuf[100]; | |
57 | ||
58 | snprintf(sbuf, sizeof(sbuf), "polypath:%s", | |
59 | iaddr_to_string(&ca->ia)); | |
60 | return sbuf; | |
61 | } | |
62 | ||
63 | static bool_t ifname_search_pats(struct polypath *st, struct cloc loc, | |
64 | const char *ifname, bool_t *want_io, | |
65 | const char *const *pats) { | |
66 | /* Returns True iff we found a list entry, in which case *want_io | |
67 | * is set to the sense of that entry. Otherwise *want_io is set | |
68 | * to the sense of the last entry, or unchanged if there were no pats. */ | |
69 | if (!pats) | |
70 | return False; | |
71 | const char *const *pati; | |
72 | for (pati=pats; *pati; pati++) { | |
73 | const char *pat=*pati; | |
74 | if (*pat=='!') { *want_io=False; pat++; } | |
75 | else if (*pat=='+') { *want_io=True; pat++; } | |
76 | else if (*pat=='*' || isalnum((unsigned char)*pat)) { *want_io=True; } | |
77 | else cfgfatal(loc,"polypath","invalid interface name pattern `%s'",pat); | |
78 | int match=fnmatch(pat,ifname,0); | |
79 | if (match==0) return True; | |
80 | if (match!=FNM_NOMATCH) | |
81 | cfgfatal(loc,"polypath","fnmatch failed! (pattern `%s')",pat); | |
82 | } | |
83 | return False; | |
84 | } | |
85 | ||
86 | static bool_t ifname_wanted(struct polypath *st, struct cloc loc, | |
87 | const char *ifname) { | |
88 | bool_t want=False; /* pretend an empty cfg ends with !<doesn'tmatch> */ | |
89 | if (ifname_search_pats(st,loc,ifname,&want, st->ifname_pats)) | |
90 | return want; | |
91 | if (want) /* last pattern was positive, do not search default */ | |
92 | return False; | |
93 | if (!st->permit_loopback && | |
94 | ifname_search_pats(st,loc,ifname,&want, default_loopback_ifname_pats)) | |
95 | return want; | |
96 | if (ifname_search_pats(st,loc,ifname,&want, default_ifname_pats)) | |
97 | return want; | |
98 | abort(); | |
99 | } | |
100 | ||
101 | static int polypath_beforepoll(void *state, struct pollfd *fds, int *nfds_io, | |
102 | int *timeout_io) | |
103 | { | |
104 | struct polypath *st=state; | |
105 | BEFOREPOLL_WANT_FDS(1); | |
106 | fds[0].fd=st->monitor_fd; | |
107 | fds[0].events=POLLIN; | |
108 | return 0; | |
109 | } | |
110 | ||
ce5c098f IJ |
111 | static inline bool_t matches32(uint32_t word, uint32_t prefix, int prefixlen) |
112 | { | |
113 | assert(prefixlen>0); | |
114 | assert(prefixlen<=32); | |
115 | uint32_t mask = ~(((uint32_t)1 << (32-prefixlen)) - 1); | |
116 | assert(!(prefix & ~mask)); | |
117 | return (word & mask) == prefix; | |
118 | } | |
119 | ||
70ad8e2c IJ |
120 | /* These macros expect |
121 | * bad_fn_type *const bad; | |
122 | * void *badctx; | |
123 | * and | |
124 | * out: | |
125 | */ | |
126 | #define BAD(m) do{ bad(st,badctx,m,0); goto out; }while(0) | |
127 | #define BADE(m,ev) do{ bad(st,badctx,m,ev); goto out; }while(0) | |
128 | typedef void bad_fn_type(struct polypath *st, void *badctx, | |
129 | const char* m, int ev); | |
130 | ||
131 | typedef void polypath_ppml_callback_type(struct polypath *st, | |
132 | bad_fn_type *bad, void *badctx, | |
133 | bool_t add, const char *ifname, const char *ifaddr, | |
134 | const union iaddr *ia, int fd /* -1 if none yet */); | |
135 | ||
136 | struct ppml_bad_ctx { | |
137 | const char *orgl; | |
138 | char *undospace; | |
139 | }; | |
140 | ||
141 | static void ppml_bad(struct polypath *st, void *badctx, const char *m, int ev) | |
142 | { | |
143 | struct ppml_bad_ctx *bc=badctx; | |
144 | if (bc->undospace) | |
145 | *(bc->undospace)=' '; | |
146 | lg_perror(LG,M_WARNING,ev, | |
147 | "error processing polypath state change: %s" | |
148 | " (while processing `%s')", | |
149 | m,bc->orgl); | |
150 | } | |
151 | ||
152 | static void polypath_process_monitor_line(struct polypath *st, char *orgl, | |
153 | polypath_ppml_callback_type *callback) | |
154 | /* always calls callback with fd==-1 */ | |
ce5c098f | 155 | { |
ce5c098f | 156 | struct udpcommon *uc=&st->uc; |
ce5c098f | 157 | char *l=orgl; |
70ad8e2c IJ |
158 | bad_fn_type (*const bad)=ppml_bad; |
159 | struct ppml_bad_ctx badctx[1]={{ | |
160 | .orgl=orgl, | |
161 | .undospace=0 | |
162 | }}; | |
ce5c098f IJ |
163 | |
164 | bool_t add; | |
165 | int c=*l++; | |
166 | if (c=='+') add=True; | |
167 | else if (c=='-') add=False; | |
168 | else BAD("bad +/-"); | |
169 | ||
170 | int proto; | |
171 | c=*l++; | |
172 | if (c=='4') proto=AF_INET; | |
173 | else if (c=='6') proto=AF_INET6; | |
174 | else BAD("bad proto"); | |
175 | ||
176 | char *space=strchr(l,' '); | |
177 | if (!space) BAD("no first space"); | |
178 | const char *ifname=space+1; | |
179 | ||
180 | space=strchr(ifname,' '); | |
181 | if (!space) BAD("no second space"); | |
182 | const char *ifaddr=space+1; | |
183 | *space=0; | |
70ad8e2c | 184 | badctx->undospace=space; |
ce5c098f IJ |
185 | |
186 | union iaddr ia; | |
187 | FILLZERO(ia); | |
188 | socklen_t salen=sizeof(ia); | |
189 | int r=adns_text2addr(ifaddr,uc->port, adns_qf_addrlit_ipv4_quadonly, | |
190 | &ia.sa, &salen); | |
191 | assert(r!=ENOSPC); | |
192 | if (r) BADE("adns_text2addr",r); | |
193 | if (ia.sa.sa_family!=proto) BAD("address family mismatch"); | |
194 | ||
195 | #define DONT(m) do{ \ | |
196 | if (add) \ | |
197 | lg_perror(LG,M_INFO,0,"ignoring %s [%s]: %s",ifname,ifaddr,m); \ | |
198 | goto out; \ | |
199 | }while(0) | |
200 | ||
201 | if (!ifname_wanted(st,st->uc.cc.loc,ifname)) | |
202 | DONT("unwanted interface name"); | |
203 | ||
204 | switch (ia.sa.sa_family) { | |
205 | case AF_INET6: { | |
206 | const struct in6_addr *i6=&ia.sin6.sin6_addr; | |
207 | #define DONTKIND(X,m) \ | |
208 | if (IN6_IS_ADDR_##X(i6)) DONT("IPv6 address is " m) | |
209 | DONTKIND(UNSPECIFIED, "unspecified"); | |
210 | DONTKIND(MULTICAST , "multicast" ); | |
211 | DONTKIND(LINKLOCAL , "link local" ); | |
212 | DONTKIND(SITELOCAL , "site local" ); | |
213 | DONTKIND(V4MAPPED , "v4-mapped" ); | |
214 | if (!st->permit_loopback) | |
215 | DONTKIND(LOOPBACK , "loopback" ); | |
216 | #undef DONTKIND | |
217 | #define DONTMASK(w7x,w6x,prefixlen,m) \ | |
218 | if (matches32(get_uint32(i6->s6_addr), \ | |
219 | ((uint32_t)0x##w7x << 16) | (uint32_t)0x##w6x, \ | |
220 | prefixlen)) \ | |
221 | DONT("IPv6 address is " m) | |
222 | DONTMASK( 100, 0, 8, "Discard-Only (RFC6666)"); | |
223 | DONTMASK(2001, 0, 23, "in IETF protocol block (RFC2928)"); | |
224 | #undef DONTMASK | |
225 | break; | |
226 | } | |
227 | case AF_INET: { | |
228 | const uint32_t i4=htonl(ia.sin.sin_addr.s_addr); | |
229 | if (i4==INADDR_ANY) DONT("IPv4 address is any/unspecified"); | |
230 | if (i4==INADDR_BROADCAST) DONT("IPv4 address is all hosts broadcast"); | |
231 | #define DONTMASK(b3,b2,b1,b0,prefixlen,m) do{ \ | |
232 | const uint8_t prefixbytes[4] = { (b3),(b2),(b1),(b0) }; \ | |
233 | if (matches32(i4,get_uint32(prefixbytes),prefixlen)) \ | |
234 | DONT("IPv4 address is " m); \ | |
235 | }while(0) | |
236 | DONTMASK(169,254,0,0, 16, "link local"); | |
237 | DONTMASK(224, 0,0,0, 4, "multicast"); | |
238 | DONTMASK(192, 0,0,0, 24, "in IETF protocol block (RFC6890)"); | |
239 | DONTMASK(240, 0,0,0, 4, "in reserved addressing block (RFC1112)"); | |
240 | if (!st->permit_loopback) | |
241 | DONTMASK(127, 0,0,0, 8, "loopback"); | |
242 | #undef DONTMASK | |
243 | break; | |
244 | } | |
245 | default: | |
246 | abort(); | |
247 | } | |
248 | ||
70ad8e2c IJ |
249 | #undef DONT |
250 | ||
ce5c098f | 251 | /* OK, process it */ |
70ad8e2c IJ |
252 | callback(st, bad,badctx, add,ifname,ifaddr,&ia,-1); |
253 | ||
254 | out:; | |
255 | } | |
256 | ||
257 | static void dump_pria(struct polypath *st, const char *ifname) | |
258 | { | |
259 | #ifdef POLYPATH_DEBUG | |
260 | struct interf *interf; | |
261 | if (ifname) | |
262 | lg_perror(LG,M_DEBUG,0, "polypath record ifaddr `%s'",ifname); | |
263 | LIST_FOREACH(interf, &st->interfs, entry) { | |
264 | lg_perror(LG,M_DEBUG,0, " polypath interface `%s', nsocks=%d", | |
265 | interf->name, interf->socks.n_socks); | |
266 | int i; | |
267 | for (i=0; i<interf->socks.n_socks; i++) { | |
268 | struct udpsock *us=&interf->socks.socks[i]; | |
269 | lg_perror(LG,M_DEBUG,0, " polypath sock fd=%d addr=%s", | |
270 | us->fd, iaddr_to_string(&us->addr)); | |
271 | } | |
272 | } | |
273 | #endif | |
274 | } | |
275 | ||
276 | static bool_t polypath_make_socket(struct polypath *st, | |
277 | bad_fn_type *bad, void *badctx, | |
278 | struct udpsock *us, const char *ifname) | |
279 | /* on error exit has called bad; might leave us->fd as -1 */ | |
280 | { | |
281 | assert(us->fd==-1); | |
282 | ||
283 | bool_t ok=udp_make_socket(&st->uc,us,M_WARNING); | |
284 | if (!ok) BAD("unable to set up socket"); | |
285 | int r=setsockopt(us->fd,SOL_SOCKET,SO_BINDTODEVICE, | |
286 | ifname,strlen(ifname)+1); | |
287 | if (r) BADE("setsockopt(,,SO_BINDTODEVICE,)",errno); | |
288 | return True; | |
289 | ||
290 | out: | |
291 | return False; | |
292 | } | |
293 | ||
294 | static void polypath_record_ifaddr(struct polypath *st, | |
295 | bad_fn_type *bad, void *badctx, | |
296 | bool_t add, const char *ifname, | |
297 | const char *ifaddr, | |
298 | const union iaddr *ia, int fd) | |
299 | { | |
300 | struct udpcommon *uc=&st->uc; | |
301 | struct interf *interf=0; | |
302 | struct udpsock *us=0; | |
303 | ||
304 | dump_pria(st,ifname); | |
305 | ||
ce5c098f IJ |
306 | int n_ifs=0; |
307 | LIST_FOREACH(interf,&st->interfs,entry) { | |
308 | if (!strcmp(interf->name,ifname)) | |
309 | goto found_interf; | |
310 | n_ifs++; | |
311 | } | |
312 | /* not found */ | |
313 | if (n_ifs==st->max_interfs) BAD("too many interfaces"); | |
314 | interf=malloc(sizeof(*interf)); | |
315 | if (!interf) BADE("malloc for new interface",errno); | |
316 | interf->name=0; | |
317 | interf->socks.n_socks=0; | |
318 | FILLZERO(interf->experienced_xmit_noaf); | |
319 | LIST_INSERT_HEAD(&st->interfs,interf,entry); | |
320 | udp_socks_register(&st->uc,&interf->socks); | |
321 | interf->name=strdup(ifname); | |
322 | if (!interf->name) BADE("strdup interface name",errno); | |
323 | found_interf: | |
324 | ||
325 | if (add) { | |
326 | if (interf->socks.n_socks == UDP_MAX_SOCKETS) | |
327 | BAD("too many addresses on this interface"); | |
328 | struct udpsock *us=&interf->socks.socks[interf->socks.n_socks]; | |
329 | us->fd=-1; | |
70ad8e2c IJ |
330 | COPY_OBJ(us->addr,*ia); |
331 | if (fd<0) { | |
332 | bool_t ok=polypath_make_socket(st,bad,badctx, us,ifname); | |
333 | if (!ok) goto out; | |
334 | } else { | |
335 | FILLZERO(us->experienced); | |
336 | us->fd=fd; | |
337 | fd=-1; | |
338 | } | |
ce5c098f IJ |
339 | interf->socks.n_socks++; |
340 | us=0; /* do not destroy this socket during `out' */ | |
341 | lg_perror(LG,M_INFO,0,"using %s %s",ifname,ifaddr); | |
342 | } else { | |
343 | int i; | |
344 | for (i=0; i<interf->socks.n_socks; i++) | |
70ad8e2c | 345 | if (!memcmp(&interf->socks.socks[i].addr,ia,sizeof(*ia))) |
ce5c098f IJ |
346 | goto address_remove_found; |
347 | BAD("address to remove not found"); | |
348 | address_remove_found: | |
349 | lg_perror(LG,M_INFO,0,"removed %s %s",ifname,ifaddr); | |
350 | udp_destroy_socket(&st->uc,&interf->socks.socks[i]); | |
351 | interf->socks.socks[i]= | |
352 | interf->socks.socks[--interf->socks.n_socks]; | |
353 | } | |
354 | ||
355 | out: | |
356 | if (us) | |
357 | udp_destroy_socket(uc,us); | |
70ad8e2c IJ |
358 | if (fd>=0) |
359 | close(fd); | |
ce5c098f IJ |
360 | if (interf && !interf->socks.n_socks) { |
361 | udp_socks_deregister(&st->uc,&interf->socks); | |
362 | LIST_REMOVE(interf,entry); | |
363 | free(interf->name); | |
364 | free(interf); | |
365 | } | |
366 | ||
70ad8e2c | 367 | dump_pria(st,0); |
ce5c098f IJ |
368 | } |
369 | ||
23ca1537 IJ |
370 | static void subproc_problem(struct polypath *st, |
371 | enum async_linebuf_result alr, const char *emsg) | |
ce5c098f | 372 | { |
ce5c098f | 373 | int status; |
ce5c098f IJ |
374 | assert(st->monitor_pid); |
375 | ||
376 | pid_t gotpid=waitpid(st->monitor_pid,&status,WNOHANG); | |
377 | if (gotpid==st->monitor_pid) { | |
378 | st->monitor_pid=0; | |
379 | lg_exitstatus(LG,M_FATAL,status,"interface monitor"); | |
380 | } else if (gotpid<0) | |
381 | lg_perror(LG,M_ERR,errno,"unable to reap interface monitor"); | |
382 | else | |
383 | assert(gotpid==0); | |
384 | ||
385 | if (alr==async_linebuf_eof) | |
386 | lg_perror(LG,M_FATAL,0,"unexpected EOF from interface monitor"); | |
387 | else | |
388 | lg_perror(LG,M_FATAL,0,"bad output from interface monitor: %s",emsg); | |
ce5c098f IJ |
389 | assert(!"not reached"); |
390 | } | |
391 | ||
23ca1537 IJ |
392 | static void afterpoll_monitor(struct polypath *st, struct pollfd *fd, |
393 | polypath_ppml_callback_type *callback) | |
394 | { | |
395 | enum async_linebuf_result alr; | |
396 | const char *emsg; | |
397 | ||
398 | while ((alr=async_linebuf_read(fd,&st->lbuf,&emsg)) == async_linebuf_ok) | |
399 | polypath_process_monitor_line(st,st->lbuf.base,callback); | |
400 | ||
401 | if (alr==async_linebuf_nothing) | |
402 | return; | |
403 | ||
404 | subproc_problem(st,alr,emsg); | |
405 | } | |
406 | ||
407 | static void polypath_afterpoll_monitor(void *state, struct pollfd *fds, | |
408 | int nfds) | |
409 | { | |
410 | struct polypath *st=state; | |
411 | if (nfds<1) return; | |
412 | afterpoll_monitor(st,fds,polypath_record_ifaddr); | |
413 | } | |
414 | ||
ce5c098f IJ |
415 | /* Actual udp packet sending work */ |
416 | static bool_t polypath_sendmsg(void *commst, struct buffer_if *buf, | |
417 | const struct comm_addr *dest) | |
418 | { | |
419 | struct polypath *st=commst; | |
420 | struct interf *interf; | |
421 | bool_t allreasonable=True; | |
422 | int af=dest->ia.sa.sa_family; | |
423 | ||
424 | LIST_FOREACH(interf,&st->interfs,entry) { | |
425 | int i; | |
426 | bool_t attempted=False, reasonable=False; | |
427 | for (i=0; i<interf->socks.n_socks; i++) { | |
428 | struct udpsock *us=&interf->socks.socks[i]; | |
429 | if (af != us->addr.sa.sa_family) | |
430 | continue; | |
431 | attempted=True; | |
432 | int r=sendto(us->fd,buf->start,buf->size, | |
433 | 0,&dest->ia.sa,iaddr_socklen(&dest->ia)); | |
434 | udp_sock_experienced(0,&st->uc, interf->name,us, | |
435 | 1,af, r,errno); | |
436 | if (r>=0) { | |
437 | reasonable=True; | |
438 | break; | |
439 | } | |
440 | if (!(errno==EAFNOSUPPORT || errno==ENETUNREACH)) | |
441 | reasonable=True; | |
442 | lg_perror(LG,M_DEBUG,errno,"%s [%s] xmit %"PRIu32" bytes to %s", | |
443 | interf->name,iaddr_to_string(&us->addr), | |
444 | buf->size,iaddr_to_string(&dest->ia)); | |
445 | } | |
446 | if (!attempted) | |
447 | if (!interf->experienced_xmit_noaf[af]++) | |
448 | lg_perror(LG,M_WARNING,0, | |
449 | "%s has no suitable address to transmit %s", | |
450 | interf->name, af_name(af)); | |
451 | allreasonable *= reasonable; | |
452 | } | |
453 | return allreasonable; | |
454 | } | |
455 | ||
23ca1537 IJ |
456 | static void child_monitor(struct polypath *st, int childfd) |
457 | { | |
458 | dup2(childfd,1); | |
459 | execvp(st->monitor_command[0],(char**)st->monitor_command); | |
460 | fprintf(stderr,"secnet: cannot execute %s: %s\n", | |
461 | st->monitor_command[0], strerror(errno)); | |
462 | exit(-1); | |
463 | } | |
464 | ||
465 | static void start_subproc(struct polypath *st, void (*make_fdpair)(int[2]), | |
466 | void (*child)(struct polypath *st, int childfd)) | |
ce5c098f | 467 | { |
ce5c098f IJ |
468 | int pfds[2]; |
469 | ||
470 | assert(!st->monitor_pid); | |
471 | assert(st->monitor_fd<0); | |
472 | ||
23ca1537 | 473 | make_fdpair(pfds); |
ce5c098f IJ |
474 | |
475 | pid_t pid=fork(); | |
476 | if (!pid) { | |
477 | afterfork(); | |
94a1d5fc | 478 | close(pfds[0]); |
23ca1537 IJ |
479 | child(st,pfds[1]); |
480 | abort(); | |
ce5c098f IJ |
481 | } |
482 | if (pid<0) | |
23ca1537 | 483 | fatal_perror("%s: failed to fork for interface monitoring", |
ce5c098f IJ |
484 | st->uc.cc.cl.description); |
485 | ||
486 | close(pfds[1]); | |
487 | st->monitor_pid=pid; | |
488 | st->monitor_fd=pfds[0]; | |
489 | setnonblock(st->monitor_fd); | |
23ca1537 | 490 | } |
ce5c098f | 491 | |
23ca1537 IJ |
492 | static void polypath_phase_startmonitor(void *sst, uint32_t newphase) |
493 | { | |
494 | struct polypath *st=sst; | |
495 | start_subproc(st,pipe_cloexec,child_monitor); | |
496 | register_for_poll(st,polypath_beforepoll, | |
497 | polypath_afterpoll_monitor,"polypath"); | |
ce5c098f IJ |
498 | } |
499 | ||
500 | static void polypath_phase_shutdown(void *sst, uint32_t newphase) | |
501 | { | |
502 | struct polypath *st=sst; | |
503 | if (st->monitor_pid) { | |
504 | assert(st->monitor_pid>0); | |
505 | kill(st->monitor_pid,SIGTERM); | |
506 | } | |
507 | } | |
508 | ||
32654a31 IJ |
509 | static void polypath_phase_childpersist(void *sst, uint32_t newphase) |
510 | { | |
511 | struct polypath *st=sst; | |
512 | struct interf *interf; | |
513 | ||
514 | LIST_FOREACH(interf,&st->interfs,entry) | |
515 | udp_socks_childpersist(&st->uc,&interf->socks); | |
516 | } | |
517 | ||
70ad8e2c IJ |
518 | #undef BAD |
519 | #undef BADE | |
520 | ||
ce5c098f IJ |
521 | static list_t *polypath_apply(closure_t *self, struct cloc loc, |
522 | dict_t *context, list_t *args) | |
523 | { | |
524 | struct polypath *st; | |
525 | ||
526 | COMM_APPLY(st,&st->uc.cc,polypath_,"polypath",loc); | |
527 | COMM_APPLY_STANDARD(st,&st->uc.cc,"polypath",args); | |
528 | UDP_APPLY_STANDARD(st,&st->uc,"polypath"); | |
529 | ||
530 | struct udpcommon *uc=&st->uc; | |
531 | struct commcommon *cc=&uc->cc; | |
532 | ||
533 | st->max_interfs=dict_read_number(d,"max-interfaces",False,"polypath",loc,3); | |
534 | ||
535 | st->ifname_pats=dict_read_string_array(d,"interfaces",False,"polypath", | |
536 | cc->loc,0); | |
537 | st->permit_loopback=0; /* ifname_wanted reads this */ | |
538 | ifname_wanted(st,st->uc.cc.loc," "); /* try to check each pattern */ | |
539 | ||
540 | st->monitor_command=dict_read_string_array(d,"monitor-command",False, | |
541 | "polypath",cc->loc, default_monitor_command); | |
542 | if (!st->monitor_command[0]) | |
543 | cfgfatal(loc,"polypath","no polypath interface monitor-command" | |
544 | " (polypath unsupported on this platform?)\n"); | |
545 | ||
546 | st->permit_loopback=dict_read_bool(d,"permit-loopback",False, | |
547 | "polypath",cc->loc,False); | |
548 | ||
549 | LIST_INIT(&st->interfs); | |
550 | buffer_new(&st->lbuf,ADNS_ADDR2TEXT_BUFLEN+100); | |
551 | BUF_ALLOC(&st->lbuf,"polypath lbuf"); | |
552 | ||
553 | st->monitor_fd=-1; | |
554 | st->monitor_pid=0; | |
555 | ||
556 | add_hook(PHASE_RUN, polypath_phase_startmonitor,st); | |
557 | add_hook(PHASE_SHUTDOWN, polypath_phase_shutdown, st); | |
32654a31 | 558 | add_hook(PHASE_CHILDPERSIST,polypath_phase_childpersist,st); |
ce5c098f IJ |
559 | |
560 | return new_closure(&cc->cl); | |
561 | } | |
562 | ||
563 | #endif /* CONFIG_IPV6 */ | |
564 | ||
565 | void polypath_module(dict_t *dict) | |
566 | { | |
567 | #ifdef CONFIG_IPV6 | |
568 | add_closure(dict,"polypath",polypath_apply); | |
569 | #endif /* CONFIG_IPV6 */ | |
570 | } |