2 * send/receive module for secnet
3 * for multi-route setups */
8 #include "comm-common.h"
15 static comm_sendmsg_fn polypath_sendmsg;
18 char *name; /* from malloc */
19 struct udpsocks socks;
20 bool_t experienced_xmit_noaf[MAX_AF+1];
21 LIST_ENTRY(interf) entry;
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;
34 int privsep_incoming_fd;
35 int privsep_ipcsock_fd;
38 static void polypath_phase_shutdown(void *sst, uint32_t newphase);
40 #define LG 0, st->uc.cc.cl.description, &st->uc.cc.loc
42 static const char *const default_loopback_ifname_pats[] = {
45 static const char *const default_ifname_pats[] = {
46 "!tun*","!tap*","!sl*","!userv*", "*", 0
49 static const char *const default_monitor_command[] = {
51 DATAROOTDIR "/secnet/" "polypath-interface-monitor-linux", 0
57 static const char *polypath_addr_to_string(void *commst,
58 const struct comm_addr *ca)
60 static char sbuf[100];
62 snprintf(sbuf, sizeof(sbuf), "polypath:%s",
63 iaddr_to_string(&ca->ia));
67 static bool_t ifname_search_pats(struct polypath *st, struct cloc loc,
68 const char *ifname, bool_t *want_io,
69 const char *const *pats) {
70 /* Returns True iff we found a list entry, in which case *want_io
71 * is set to the sense of that entry. Otherwise *want_io is set
72 * to the sense of the last entry, or unchanged if there were no pats. */
75 const char *const *pati;
76 for (pati=pats; *pati; pati++) {
77 const char *pat=*pati;
78 if (*pat=='!') { *want_io=False; pat++; }
79 else if (*pat=='+') { *want_io=True; pat++; }
80 else if (*pat=='*' || isalnum((unsigned char)*pat)) { *want_io=True; }
81 else cfgfatal(loc,"polypath","invalid interface name pattern `%s'",pat);
82 int match=fnmatch(pat,ifname,0);
83 if (match==0) return True;
84 if (match!=FNM_NOMATCH)
85 cfgfatal(loc,"polypath","fnmatch failed! (pattern `%s')",pat);
90 static bool_t ifname_wanted(struct polypath *st, struct cloc loc,
92 bool_t want=False; /* pretend an empty cfg ends with !<doesn'tmatch> */
93 if (ifname_search_pats(st,loc,ifname,&want, st->ifname_pats))
95 if (want) /* last pattern was positive, do not search default */
97 if (!st->permit_loopback &&
98 ifname_search_pats(st,loc,ifname,&want, default_loopback_ifname_pats))
100 if (ifname_search_pats(st,loc,ifname,&want, default_ifname_pats))
105 static int polypath_beforepoll(void *state, struct pollfd *fds, int *nfds_io,
108 struct polypath *st=state;
109 BEFOREPOLL_WANT_FDS(1);
110 fds[0].fd=st->monitor_fd;
111 fds[0].events=POLLIN;
115 static inline bool_t matches32(uint32_t word, uint32_t prefix, int prefixlen)
118 assert(prefixlen<=32);
119 uint32_t mask = ~(((uint32_t)1 << (32-prefixlen)) - 1);
120 assert(!(prefix & ~mask));
121 return (word & mask) == prefix;
124 /* These macros expect
125 * bad_fn_type *const bad;
130 #define BAD(m) do{ bad(st,badctx,M_WARNING,m,0); goto out; }while(0)
131 #define BADE(m,ev) do{ bad(st,badctx,M_WARNING,m,ev); goto out; }while(0)
132 typedef void bad_fn_type(struct polypath *st, void *badctx,
133 int mclass, const char* m, int ev);
135 typedef void polypath_ppml_callback_type(struct polypath *st,
136 bad_fn_type *bad, void *badctx,
137 bool_t add, const char *ifname, const char *ifaddr,
138 const union iaddr *ia, int fd /* -1 if none yet */);
140 struct ppml_bad_ctx {
145 static void ppml_bad(struct polypath *st, void *badctx,
146 int mclass, const char *m, int ev)
148 struct ppml_bad_ctx *bc=badctx;
150 *(bc->undospace)=' ';
151 lg_perror(LG,mclass,ev,
152 "error processing polypath state change: %s"
153 " (while processing `%s')",
157 static void polypath_process_monitor_line(struct polypath *st, char *orgl,
158 polypath_ppml_callback_type *callback)
159 /* always calls callback with fd==-1 */
161 struct udpcommon *uc=&st->uc;
163 bad_fn_type (*const bad)=ppml_bad;
164 struct ppml_bad_ctx badctx[1]={{
171 if (c=='+') add=True;
172 else if (c=='-') add=False;
177 if (c=='4') proto=AF_INET;
178 else if (c=='6') proto=AF_INET6;
179 else BAD("bad proto");
181 char *space=strchr(l,' ');
182 if (!space) BAD("no first space");
183 const char *ifname=space+1;
185 space=strchr(ifname,' ');
186 if (!space) BAD("no second space");
187 const char *ifaddr=space+1;
189 badctx->undospace=space;
193 socklen_t salen=sizeof(ia);
194 int r=adns_text2addr(ifaddr,uc->port, adns_qf_addrlit_ipv4_quadonly,
197 if (r) BADE("adns_text2addr",r);
198 if (ia.sa.sa_family!=proto) BAD("address family mismatch");
200 #define DONT(m) do{ \
202 lg_perror(LG,M_INFO,0,"ignoring %s [%s]: %s",ifname,ifaddr,m); \
206 if (!ifname_wanted(st,st->uc.cc.loc,ifname))
207 DONT("unwanted interface name");
209 switch (ia.sa.sa_family) {
211 const struct in6_addr *i6=&ia.sin6.sin6_addr;
212 #define DONTKIND(X,m) \
213 if (IN6_IS_ADDR_##X(i6)) DONT("IPv6 address is " m)
214 DONTKIND(UNSPECIFIED, "unspecified");
215 DONTKIND(MULTICAST , "multicast" );
216 DONTKIND(LINKLOCAL , "link local" );
217 DONTKIND(SITELOCAL , "site local" );
218 DONTKIND(V4MAPPED , "v4-mapped" );
219 if (!st->permit_loopback)
220 DONTKIND(LOOPBACK , "loopback" );
222 #define DONTMASK(w7x,w6x,prefixlen,m) \
223 if (matches32(get_uint32(i6->s6_addr), \
224 ((uint32_t)0x##w7x << 16) | (uint32_t)0x##w6x, \
226 DONT("IPv6 address is " m)
227 DONTMASK( 100, 0, 8, "Discard-Only (RFC6666)");
228 DONTMASK(2001, 0, 23, "in IETF protocol block (RFC2928)");
229 DONTMASK(fc00, 0, 7, "Uniqe Local unicast (RFC4193)");
234 const uint32_t i4=htonl(ia.sin.sin_addr.s_addr);
235 if (i4==INADDR_ANY) DONT("IPv4 address is any/unspecified");
236 if (i4==INADDR_BROADCAST) DONT("IPv4 address is all hosts broadcast");
237 #define DONTMASK(b3,b2,b1,b0,prefixlen,m) do{ \
238 const uint8_t prefixbytes[4] = { (b3),(b2),(b1),(b0) }; \
239 if (matches32(i4,get_uint32(prefixbytes),prefixlen)) \
240 DONT("IPv4 address is " m); \
242 DONTMASK(169,254,0,0, 16, "link local");
243 DONTMASK(224, 0,0,0, 4, "multicast");
244 DONTMASK(192, 0,0,0, 24, "in IETF protocol block (RFC6890)");
245 DONTMASK(240, 0,0,0, 4, "in reserved addressing block (RFC1112)");
246 if (!st->permit_loopback)
247 DONTMASK(127, 0,0,0, 8, "loopback");
258 callback(st, bad,badctx, add,ifname,ifaddr,&ia,-1);
263 static void dump_pria(struct polypath *st, const char *ifname)
265 #ifdef POLYPATH_DEBUG
266 struct interf *interf;
268 lg_perror(LG,M_DEBUG,0, "polypath record ifaddr `%s'",ifname);
269 LIST_FOREACH(interf, &st->interfs, entry) {
270 lg_perror(LG,M_DEBUG,0, " polypath interface `%s', nsocks=%d",
271 interf->name, interf->socks.n_socks);
273 for (i=0; i<interf->socks.n_socks; i++) {
274 struct udpsock *us=&interf->socks.socks[i];
275 lg_perror(LG,M_DEBUG,0, " polypath sock fd=%d addr=%s",
276 us->fd, iaddr_to_string(&us->addr));
282 static bool_t polypath_make_socket(struct polypath *st,
283 bad_fn_type *bad, void *badctx,
284 struct udpsock *us, const char *ifname)
285 /* on error exit has called bad; might leave us->fd as -1 */
289 bool_t ok=udp_make_socket(&st->uc,us,M_WARNING);
290 if (!ok) BAD("unable to set up socket");
291 int r=setsockopt(us->fd,SOL_SOCKET,SO_BINDTODEVICE,
292 ifname,strlen(ifname)+1);
293 if (r) BADE("setsockopt(,,SO_BINDTODEVICE,)",errno);
300 static void polypath_record_ifaddr(struct polypath *st,
301 bad_fn_type *bad, void *badctx,
302 bool_t add, const char *ifname,
304 const union iaddr *ia, int fd)
306 struct udpcommon *uc=&st->uc;
307 struct interf *interf=0;
308 struct udpsock *us=0;
310 dump_pria(st,ifname);
313 LIST_FOREACH(interf,&st->interfs,entry) {
314 if (!strcmp(interf->name,ifname))
319 if (n_ifs==st->max_interfs) BAD("too many interfaces");
320 interf=malloc(sizeof(*interf));
321 if (!interf) BADE("malloc for new interface",errno);
323 interf->socks.n_socks=0;
324 FILLZERO(interf->experienced_xmit_noaf);
325 LIST_INSERT_HEAD(&st->interfs,interf,entry);
326 interf->name=strdup(ifname);
327 udp_socks_register(&st->uc,&interf->socks,interf->name);
328 if (!interf->name) BADE("strdup interface name",errno);
332 if (interf->socks.n_socks == UDP_MAX_SOCKETS)
333 BAD("too many addresses on this interface");
334 struct udpsock *us=&interf->socks.socks[interf->socks.n_socks];
336 COPY_OBJ(us->addr,*ia);
338 bool_t ok=polypath_make_socket(st,bad,badctx, us,ifname);
341 bool_t ok=udp_import_socket(uc,us,M_WARNING,fd);
345 interf->socks.n_socks++;
346 lg_perror(LG,M_INFO,0,"using %s %s",ifname,
347 iaddr_to_string(&us->addr));
348 us=0; /* do not destroy this socket during `out' */
351 for (i=0; i<interf->socks.n_socks; i++)
352 if (iaddr_equal(&interf->socks.socks[i].addr,ia,True))
353 goto address_remove_found;
354 bad(st,badctx,M_DEBUG,"address to remove not found",0);
356 address_remove_found:
357 lg_perror(LG,M_INFO,0,"removed %s %s",ifname,
358 iaddr_to_string(&interf->socks.socks[i].addr));
359 udp_destroy_socket(&st->uc,&interf->socks.socks[i]);
360 interf->socks.socks[i]=
361 interf->socks.socks[--interf->socks.n_socks];
366 udp_destroy_socket(uc,us);
369 if (interf && !interf->socks.n_socks) {
370 udp_socks_deregister(&st->uc,&interf->socks);
371 LIST_REMOVE(interf,entry);
379 static void subproc_problem(struct polypath *st,
380 enum async_linebuf_result alr, const char *emsg)
383 assert(st->monitor_pid);
385 pid_t gotpid=waitpid(st->monitor_pid,&status,WNOHANG);
386 if (gotpid==st->monitor_pid) {
388 lg_exitstatus(LG,M_FATAL,status,"interface monitor");
390 lg_perror(LG,M_ERR,errno,"unable to reap interface monitor");
394 if (alr==async_linebuf_eof)
395 lg_perror(LG,M_FATAL,0,"unexpected EOF from interface monitor");
397 lg_perror(LG,M_FATAL,0,"bad output from interface monitor: %s",emsg);
398 assert(!"not reached");
401 /* Used in non-privsep case, and in privsep child */
402 static void afterpoll_monitor(struct polypath *st, struct pollfd *fd,
403 polypath_ppml_callback_type *callback)
405 enum async_linebuf_result alr;
408 while ((alr=async_linebuf_read(fd,&st->lbuf,&emsg)) == async_linebuf_ok)
409 polypath_process_monitor_line(st,st->lbuf.base,callback);
411 if (alr==async_linebuf_nothing)
414 subproc_problem(st,alr,emsg);
417 /* Used in non-privsep case only - glue for secnet main loop */
418 static void polypath_afterpoll_monitor(void *state, struct pollfd *fds,
421 struct polypath *st=state;
423 afterpoll_monitor(st,fds,polypath_record_ifaddr);
426 /* Actual udp packet sending work */
427 static bool_t polypath_sendmsg(void *commst, struct buffer_if *buf,
428 const struct comm_addr *dest)
430 struct polypath *st=commst;
431 struct interf *interf;
432 bool_t allreasonable=True;
433 int af=dest->ia.sa.sa_family;
435 LIST_FOREACH(interf,&st->interfs,entry) {
437 bool_t attempted=False, reasonable=False;
438 for (i=0; i<interf->socks.n_socks; i++) {
439 struct udpsock *us=&interf->socks.socks[i];
440 if (af != us->addr.sa.sa_family)
443 int r=sendto(us->fd,buf->start,buf->size,
444 0,&dest->ia.sa,iaddr_socklen(&dest->ia));
445 udp_sock_experienced(0,&st->uc,&interf->socks,us,
446 &dest->ia,af, r,errno);
451 if (!(errno==EAFNOSUPPORT || errno==ENETUNREACH))
453 lg_perror(LG,M_DEBUG,errno,"%s [%s] xmit %"PRIu32" bytes to %s",
454 interf->name,iaddr_to_string(&us->addr),
455 buf->size,iaddr_to_string(&dest->ia));
458 if (!interf->experienced_xmit_noaf[af]++)
459 lg_perror(LG,M_WARNING,0,
460 "%s has no suitable address to transmit %s",
461 interf->name, af_name(af));
462 allreasonable *= reasonable;
464 return allreasonable;
467 /* Non-privsep: called in (sole) child. Privsep: in grandchild. */
468 static void child_monitor(struct polypath *st, int childfd)
471 execvp(st->monitor_command[0],(char**)st->monitor_command);
472 fprintf(stderr,"secnet: cannot execute %s: %s\n",
473 st->monitor_command[0], strerror(errno));
477 /* General utility function. */
478 static void start_subproc(struct polypath *st, void (*make_fdpair)(int[2]),
479 void (*child)(struct polypath *st, int childfd),
484 assert(!st->monitor_pid);
485 assert(st->monitor_fd<0);
497 fatal_perror("%s: failed to fork for interface monitoring",
498 st->uc.cc.cl.description);
502 st->monitor_fd=pfds[0];
503 setnonblock(st->monitor_fd);
505 lg_perror(LG,M_NOTICE,0, "%s: spawning %s [pid %ld]",
506 st->uc.cc.cl.description, desc, (long)st->monitor_pid);
509 /* Non-privsep only: glue for forking the monitor, from the main loop */
510 static void polypath_phase_startmonitor(void *sst, uint32_t newphase)
512 struct polypath *st=sst;
513 start_subproc(st,pipe_cloexec,child_monitor,
514 "interface monitor (no privsep)");
515 register_for_poll(st,polypath_beforepoll,
516 polypath_afterpoll_monitor,"polypath");
519 /*----- Privsep-only: -----*/
522 * We use two subprocesses, a child and a grandchild. These are
523 * forked before secnet drops privilege.
525 * The grandchild is the same interface monitor helper script as used
526 * in the non-privsep case. But its lines are read by the child
527 * instead of by the main secnet. The child is responsible for
528 * creating the actual socket (binding it, etc.). Each socket is
529 * passed to secnet proper via fd passing, along with a data message
530 * describing the interface name and address. The child does not
531 * retain a list of current interfaces and addresses - it trusts the
532 * interface monitor to get that right. secnet proper still maintains
533 * that data structure.
535 * The result is that much of the non-privsep code can be reused, but
536 * just plumbed together differently.
538 * The child does not retain the socket after passing it on.
539 * Interface removals are handled similarly but without any fd.
541 * The result is that the configuration's limits on which interfaces
542 * and ports secnet may use are enforced by the privileged child.
545 struct privsep_mdata {
551 static void papp_bad(struct polypath *st, void *badctx,
552 int mclass, const char *m, int ev)
554 const struct privsep_mdata *mdata=(const void*)st->lbuf.start;
555 const char *addr_str=badctx;
557 lg_perror(LG,mclass,ev,
558 "error processing polypath address change %s %s [%s]: %s",
559 mdata->add ? "+" : "-",
560 mdata->ifname, addr_str, m);
563 static void polypath_afterpoll_privsep(void *state, struct pollfd *fds,
565 /* In secnet proper; receives messages from child. */
567 struct polypath *st=state;
571 int revents=fds[0].revents;
573 const char *badbit=pollbadbit(revents);
574 if (badbit) subproc_problem(st,async_linebuf_broken,badbit);
576 if (!(revents & POLLIN)) return;
579 if (st->lbuf.size==sizeof(struct privsep_mdata)) {
580 const struct privsep_mdata *mdata=(const void*)st->lbuf.start;
581 if (mdata->add && st->privsep_incoming_fd<0)
582 fatal("polypath (privsep): got add message data but no fd");
583 if (!mdata->add && st->privsep_incoming_fd>=0)
584 fatal("polypath (privsep): got remove message data with fd");
585 if (!memchr(mdata->ifname,0,sizeof(mdata->ifname)))
586 fatal("polypath (privsep): got ifname with no terminating nul");
587 int af=mdata->ia.sa.sa_family;
588 if (!(af==AF_INET6 || af==AF_INET))
589 fatal("polypath (privsep): got message data but bad AF %d",af);
590 const char *addr_str=iaddr_to_string(&mdata->ia);
591 polypath_record_ifaddr(st,papp_bad,(void*)addr_str,
592 mdata->add,mdata->ifname,addr_str,
593 &mdata->ia, st->privsep_incoming_fd);
594 st->privsep_incoming_fd=-1;
599 size_t cmsgdatalen=sizeof(fd);
600 char cmsg_control_buf[CMSG_SPACE(cmsgdatalen)];
607 iov.iov_base=st->lbuf.start+st->lbuf.size;
608 iov.iov_len=sizeof(struct privsep_mdata)-st->lbuf.size;
610 if (st->privsep_incoming_fd<0) {
611 msg.msg_control=cmsg_control_buf;
612 msg.msg_controllen=sizeof(cmsg_control_buf);
615 ssize_t got=recvmsg(st->monitor_fd,&msg,0);
617 if (errno==EINTR) continue;
618 if (iswouldblock(errno)) break;
619 fatal_perror("polypath (privsep): recvmsg failed");
622 subproc_problem(st,async_linebuf_eof,0);
626 if (msg.msg_controllen) {
627 size_t cmsgdatalen=sizeof(st->privsep_incoming_fd);
628 struct cmsghdr *h=CMSG_FIRSTHDR(&msg);
629 if (!(st->privsep_incoming_fd==-1 &&
631 h->cmsg_level==SOL_SOCKET &&
632 h->cmsg_type==SCM_RIGHTS &&
633 h->cmsg_len==CMSG_LEN(cmsgdatalen) &&
634 !CMSG_NXTHDR(&msg,h)))
635 subproc_problem(st,async_linebuf_broken,"bad cmsg");
636 memcpy(&st->privsep_incoming_fd,CMSG_DATA(h),cmsgdatalen);
637 assert(st->privsep_incoming_fd>=0);
643 static void privsep_handle_ifaddr(struct polypath *st,
644 bad_fn_type *bad, void *badctx,
645 bool_t add, const char *ifname,
647 const union iaddr *ia, int fd_dummy)
648 /* In child: handles discovered wanted interfaces, making sockets
649 and sending them to secnet proper. */
653 struct udpsock us={ .fd=-1 };
654 size_t cmsgdatalen=sizeof(us.fd);
655 char cmsg_control_buf[CMSG_SPACE(cmsgdatalen)];
657 assert(fd_dummy==-1);
659 struct privsep_mdata mdata;
663 size_t l=strlen(ifname);
664 if (l>=sizeof(mdata.ifname)) BAD("interface name too long");
665 strcpy(mdata.ifname,ifname);
667 COPY_OBJ(mdata.ia,*ia);
670 iov.iov_len =sizeof(mdata);
677 COPY_OBJ(us.addr,*ia);
678 bool_t ok=polypath_make_socket(st,bad,badctx,&us,ifname);
681 msg.msg_control=cmsg_control_buf;
682 msg.msg_controllen=sizeof(cmsg_control_buf);
684 struct cmsghdr *h=CMSG_FIRSTHDR(&msg);
685 h->cmsg_level=SOL_SOCKET;
686 h->cmsg_type =SCM_RIGHTS;
687 h->cmsg_len =CMSG_LEN(cmsgdatalen);
688 memcpy(CMSG_DATA(h),&us.fd,cmsgdatalen);
691 while (iov.iov_len) {
692 ssize_t got=sendmsg(st->privsep_ipcsock_fd,&msg,0);
694 if (errno!=EINTR) fatal_perror("polypath privsep sendmsg");
698 assert((size_t)got<=iov.iov_len);
700 iov.iov_base=(char*)iov.iov_base+got;
703 msg.msg_controllen=0;
707 if (us.fd>=0) close(us.fd);
710 static void child_privsep(struct polypath *st, int ipcsockfd)
711 /* Privsep child main loop. */
713 struct pollfd fds[2];
715 enter_phase(PHASE_CHILDPERSIST);
717 st->privsep_ipcsock_fd=ipcsockfd;
718 start_subproc(st,pipe_cloexec,child_monitor,
719 "interface monitor (grandchild)");
722 int r=polypath_beforepoll(st,fds,&nfds,0);
726 fds[1].fd=st->privsep_ipcsock_fd;
727 fds[1].events=POLLIN;
729 r=poll(fds,ARRAY_SIZE(fds),-1);
732 if (errno==EINTR) continue;
733 fatal_perror("polypath privsep poll");
735 if (fds[1].revents) {
736 if (fds[1].revents & (POLLHUP|POLLIN)) {
737 polypath_phase_shutdown(st,PHASE_SHUTDOWN);
740 fatal("polypath privsep poll parent socket revents=%#x",
743 if (fds[0].revents & POLLNVAL)
744 fatal("polypath privsep poll child socket POLLNVAL");
745 afterpoll_monitor(st,fds,privsep_handle_ifaddr);
749 static void privsep_socketpair(int *fd)
751 int r=socketpair(AF_UNIX,SOCK_STREAM,0,fd);
752 if (r) fatal_perror("socketpair(AF_UNIX,SOCK_STREAM,,)");
757 static void polypath_phase_startprivsep(void *sst, uint32_t newphase)
759 struct polypath *st=sst;
761 if (!will_droppriv()) {
762 add_hook(PHASE_RUN, polypath_phase_startmonitor,st);
766 start_subproc(st,privsep_socketpair,child_privsep,
767 "socket generator (privsep interface handler)");
770 buffer_destroy(&st->lbuf);
771 buffer_new(&st->lbuf,sizeof(struct privsep_mdata));
772 BUF_ALLOC(&st->lbuf,"polypath mdata buf");
773 st->privsep_incoming_fd=-1;
775 register_for_poll(st,polypath_beforepoll,
776 polypath_afterpoll_privsep,"polypath");
779 static void polypath_phase_shutdown(void *sst, uint32_t newphase)
781 struct polypath *st=sst;
782 if (st->monitor_pid) {
783 assert(st->monitor_pid>0);
784 kill(st->monitor_pid,SIGTERM);
788 static void polypath_phase_childpersist(void *sst, uint32_t newphase)
790 struct polypath *st=sst;
791 struct interf *interf;
793 LIST_FOREACH(interf,&st->interfs,entry)
794 udp_socks_childpersist(&st->uc,&interf->socks);
800 /*----- generic closure and module setup -----*/
802 static list_t *polypath_apply(closure_t *self, struct cloc loc,
803 dict_t *context, list_t *args)
807 COMM_APPLY(st,&st->uc.cc,polypath_,"polypath",loc);
808 COMM_APPLY_STANDARD(st,&st->uc.cc,"polypath",args);
809 UDP_APPLY_STANDARD(st,&st->uc,"polypath");
811 struct udpcommon *uc=&st->uc;
812 struct commcommon *cc=&uc->cc;
814 st->max_interfs=dict_read_number(d,"max-interfaces",False,"polypath",loc,3);
816 st->ifname_pats=dict_read_string_array(d,"interfaces",False,"polypath",
818 st->permit_loopback=0; /* ifname_wanted reads this */
819 ifname_wanted(st,st->uc.cc.loc," "); /* try to check each pattern */
821 st->monitor_command=dict_read_string_array(d,"monitor-command",False,
822 "polypath",cc->loc, default_monitor_command);
823 if (!st->monitor_command[0])
824 cfgfatal(loc,"polypath","no polypath interface monitor-command"
825 " (polypath unsupported on this platform?)\n");
827 st->permit_loopback=dict_read_bool(d,"permit-loopback",False,
828 "polypath",cc->loc,False);
830 LIST_INIT(&st->interfs);
831 buffer_new(&st->lbuf,ADNS_ADDR2TEXT_BUFLEN+100);
832 BUF_ALLOC(&st->lbuf,"polypath lbuf");
837 add_hook(PHASE_GETRESOURCES, polypath_phase_startprivsep,st);
839 add_hook(PHASE_SHUTDOWN, polypath_phase_shutdown, st);
840 add_hook(PHASE_CHILDPERSIST,polypath_phase_childpersist,st);
842 return new_closure(&cc->cl);
845 #endif /* CONFIG_IPV6 */
847 void polypath_module(dict_t *dict)
850 add_closure(dict,"polypath",polypath_apply);
851 #endif /* CONFIG_IPV6 */