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 "!userv*","!sl*","!tap*","!tun*", "*", 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,0); goto out; }while(0)
131 #define BADE(m,ev) do{ bad(st,badctx,m,ev); goto out; }while(0)
132 typedef void bad_fn_type(struct polypath *st, void *badctx,
133 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, const char *m, int ev)
147 struct ppml_bad_ctx *bc=badctx;
149 *(bc->undospace)=' ';
150 lg_perror(LG,M_WARNING,ev,
151 "error processing polypath state change: %s"
152 " (while processing `%s')",
156 static void polypath_process_monitor_line(struct polypath *st, char *orgl,
157 polypath_ppml_callback_type *callback)
158 /* always calls callback with fd==-1 */
160 struct udpcommon *uc=&st->uc;
162 bad_fn_type (*const bad)=ppml_bad;
163 struct ppml_bad_ctx badctx[1]={{
170 if (c=='+') add=True;
171 else if (c=='-') add=False;
176 if (c=='4') proto=AF_INET;
177 else if (c=='6') proto=AF_INET6;
178 else BAD("bad proto");
180 char *space=strchr(l,' ');
181 if (!space) BAD("no first space");
182 const char *ifname=space+1;
184 space=strchr(ifname,' ');
185 if (!space) BAD("no second space");
186 badctx->undospace=space;
188 const char *ifaddr=space;
192 socklen_t salen=sizeof(ia);
193 int r=adns_text2addr(ifaddr,uc->port, adns_qf_addrlit_ipv4_quadonly,
196 if (r) BADE("adns_text2addr",r);
197 if (ia.sa.sa_family!=proto) BAD("address family mismatch");
199 #define DONT(m) do{ \
201 lg_perror(LG,M_INFO,0,"ignoring %s [%s]: %s",ifname,ifaddr,m); \
205 if (!ifname_wanted(st,st->uc.cc.loc,ifname))
206 DONT("unwanted interface name");
208 switch (ia.sa.sa_family) {
210 const struct in6_addr *i6=&ia.sin6.sin6_addr;
211 #define DONTKIND(X,x) \
212 if (IN6_IS_ADDR_##X(i6)) DONT("IPv6 address is " #x)
213 DONTKIND(UNSPECIFIED,unspecified);
214 DONTKIND(MULTICAST ,multicast );
215 DONTKIND(LINKLOCAL ,linklocal );
216 DONTKIND(SITELOCAL ,sitelocal );
217 DONTKIND(V4MAPPED ,v4mapped );
218 if (!st->permit_loopback)
219 DONTKIND(LOOPBACK ,loopback );
221 #define DONTMASK(w7x,w6x,prefixlen,m) \
222 if (matches32(get_uint32(i6->s6_addr), \
223 ((uint32_t)0x##w7x << 16) | (uint32_t)0x##w6x, \
225 DONT("IPv6 address is " m)
226 DONTMASK( 100, 0, 8, "Discard-Only (RFC6666)");
227 DONTMASK(2001, 0, 23, "in IETF protocol block (RFC2928)");
232 const uint32_t i4=htonl(ia.sin.sin_addr.s_addr);
233 if (i4==INADDR_ANY) DONT("IPv4 address is any/unspecified");
234 if (i4==INADDR_BROADCAST) DONT("IPv4 address is all hosts broadcast");
235 #define DONTMASK(b3,b2,b1,b0,prefixlen,m) do{ \
236 const uint8_t prefixbytes[4] = { (b3),(b2),(b1),(b0) }; \
237 if (matches32(i4,get_uint32(prefixbytes),prefixlen)) \
238 DONT("IPv4 address is " m); \
240 DONTMASK(169,254,0,0, 16, "link local");
241 DONTMASK(224, 0,0,0, 4, "multicast");
242 DONTMASK(192, 0,0,0, 24, "in IETF protocol block (RFC6890)");
243 DONTMASK(240, 0,0,0, 4, "in reserved addressing block (RFC1112)");
244 if (!st->permit_loopback)
245 DONTMASK(127, 0,0,0, 8, "loopback");
256 callback(st, bad,badctx, add,ifname,ifaddr,&ia,-1);
261 static void dump_pria(struct polypath *st, const char *ifname)
264 struct interf *interf;
266 lg_perror(LG,M_DEBUG,0, "polypath record ifaddr `%s'",ifname);
267 LIST_FOREACH(interf, &st->interfs, entry) {
268 lg_perror(LG,M_DEBUG,0, " polypath interface `%s', nsocks=%d",
269 interf->name, interf->socks.n_socks);
271 for (i=0; i<interf->socks.n_socks; i++) {
272 struct udpsock *us=&interf->socks.socks[i];
273 lg_perror(LG,M_DEBUG,0, " polypath sock fd=%d addr=%s",
274 us->fd, iaddr_to_string(&us->addr));
280 static bool_t polypath_make_socket(struct polypath *st,
281 bad_fn_type *bad, void *badctx,
282 struct udpsock *us, const char *ifname)
283 /* on error exit has called bad; might leave us->fd as -1 */
287 bool_t ok=udp_make_socket(&st->uc,us,M_WARNING);
288 if (!ok) BAD("unable to set up socket");
289 int r=setsockopt(us->fd,SOL_SOCKET,SO_BINDTODEVICE,
290 ifname,strlen(ifname)+1);
291 if (r) BADE("setsockopt(,,SO_BINDTODEVICE,)",errno);
298 static void polypath_record_ifaddr(struct polypath *st,
299 bad_fn_type *bad, void *badctx,
300 bool_t add, const char *ifname,
302 const union iaddr *ia, int fd)
304 struct udpcommon *uc=&st->uc;
305 struct interf *interf=0;
306 struct udpsock *us=0;
308 dump_pria(st,ifname);
311 LIST_FOREACH(interf,&st->interfs,entry) {
312 if (!strcmp(interf->name,ifname))
317 if (n_ifs==st->max_interfs) BAD("too many interfaces");
318 interf=malloc(sizeof(*interf));
319 if (!interf) BADE("malloc for new interface",errno);
321 interf->socks.n_socks=0;
322 FILLZERO(interf->experienced_xmit_noaf);
323 LIST_INSERT_HEAD(&st->interfs,interf,entry);
324 interf->name=strdup(ifname);
325 udp_socks_register(&st->uc,&interf->socks,interf->name);
326 if (!interf->name) BADE("strdup interface name",errno);
330 if (interf->socks.n_socks == UDP_MAX_SOCKETS)
331 BAD("too many addresses on this interface");
332 struct udpsock *us=&interf->socks.socks[interf->socks.n_socks];
334 COPY_OBJ(us->addr,*ia);
336 bool_t ok=polypath_make_socket(st,bad,badctx, us,ifname);
339 bool_t ok=udp_import_socket(uc,us,M_WARNING,fd);
343 interf->socks.n_socks++;
344 lg_perror(LG,M_INFO,0,"using %s %s",ifname,
345 iaddr_to_string(&us->addr));
346 us=0; /* do not destroy this socket during `out' */
349 for (i=0;i<interf->socks.n_socks;i++)
350 if (iaddr_equal(&interf->socks.socks[i].addr,ia,True))
351 goto address_remove_found;
352 BAD("address to remove not found");
353 address_remove_found:
354 lg_perror(LG,M_INFO,0,"removed %s %s",ifname,
355 iaddr_to_string(&interf->socks.socks[i].addr));
356 udp_destroy_socket(&st->uc,&interf->socks.socks[i]);
357 interf->socks.socks[i]=
358 interf->socks.socks[--interf->socks.n_socks];
363 udp_destroy_socket(uc,us);
366 if (interf && !interf->socks.n_socks) {
367 udp_socks_deregister(&st->uc,&interf->socks);
368 LIST_REMOVE(interf,entry);
376 static void subproc_problem(struct polypath *st,
377 enum async_linebuf_result alr, const char *emsg)
380 assert(st->monitor_pid);
382 pid_t gotpid=waitpid(st->monitor_pid,&status,WNOHANG);
383 if (gotpid==st->monitor_pid) {
385 lg_exitstatus(LG,M_FATAL,status,"interface monitor");
387 lg_perror(LG,M_ERR,errno,"unable to reap interface monitor");
391 if (alr==async_linebuf_eof)
392 lg_perror(LG,M_FATAL,0,"unexpected EOF from interface monitor");
394 lg_perror(LG,M_FATAL,0,"bad output from interface monitor: %s",emsg);
395 assert(!"not reached");
398 /* Used in non-privsep case, and in privsep child */
399 static void afterpoll_monitor(struct polypath *st, struct pollfd *fd,
400 polypath_ppml_callback_type *callback)
402 enum async_linebuf_result alr;
405 while ((alr=async_linebuf_read(fd,&st->lbuf,&emsg)) == async_linebuf_ok)
406 polypath_process_monitor_line(st,st->lbuf.base,callback);
408 if (alr==async_linebuf_nothing)
411 subproc_problem(st,alr,emsg);
414 /* Used in non-privsep case only - glue for secnet main loop */
415 static void polypath_afterpoll_monitor(void *state, struct pollfd *fds,
418 struct polypath *st=state;
420 afterpoll_monitor(st,fds,polypath_record_ifaddr);
423 /* Actual udp packet sending work */
424 static bool_t polypath_sendmsg(void *commst, struct buffer_if *buf,
425 const struct comm_addr *dest)
427 struct polypath *st=commst;
428 struct interf *interf;
429 bool_t allreasonable=True;
430 int af=dest->ia.sa.sa_family;
432 LIST_FOREACH(interf,&st->interfs,entry) {
434 bool_t attempted=False, reasonable=False;
435 for (i=0; i<interf->socks.n_socks; i++) {
436 struct udpsock *us=&interf->socks.socks[i];
437 if (af != us->addr.sa.sa_family)
440 int r=sendto(us->fd,buf->start,buf->size,
441 0,&dest->ia.sa,iaddr_socklen(&dest->ia));
442 udp_sock_experienced(0,&st->uc,&interf->socks,us,
448 if (!(errno==EAFNOSUPPORT || errno==ENETUNREACH))
450 lg_perror(LG,M_DEBUG,errno,"xmit %"PRIu32" bytes to %s",
451 buf->size,iaddr_to_string(&dest->ia));
454 if (!interf->experienced_xmit_noaf[af]++)
455 lg_perror(LG, M_WARNING,0,
456 "%s has no suitable address to transmit %s",
457 interf->name, af_name(af));
458 allreasonable &= reasonable;
460 return allreasonable;
463 /* Non-privsep: called in (sole) child. Privsep: in grandchild. */
464 static void child_monitor(struct polypath *st, int childfd)
467 execvp(st->monitor_command[0],(char**)st->monitor_command);
468 fprintf(stderr,"secnet: cannot execute %s: %s\n",
469 st->monitor_command[0], strerror(errno));
473 /* General utility function. */
474 static void start_subproc(struct polypath *st, void (*make_fdpair)(int[2]),
475 void (*child)(struct polypath *st, int childfd),
480 assert(!st->monitor_pid);
481 assert(st->monitor_fd<0);
493 fatal_perror("%s: failed to fork for interface monitoring",
494 st->uc.cc.cl.description);
498 st->monitor_fd=pfds[0];
499 setnonblock(st->monitor_fd);
501 lg_perror(LG,M_NOTICE,0, "%s: spawning %s [pid %ld]",
502 st->uc.cc.cl.description, desc, (long)st->monitor_pid);
505 /* Non-privsep only: glue for forking the monitor, from the main loop */
506 static void polypath_phase_startmonitor(void *sst, uint32_t newphase)
508 struct polypath *st=sst;
509 start_subproc(st,pipe_cloexec,child_monitor,
510 "interface monitor (no privsep)");
511 register_for_poll(st,polypath_beforepoll,
512 polypath_afterpoll_monitor,"polypath");
515 /*----- Privsep-only: -----*/
518 * We use two subprocesses, a child and a grandchild. These are
519 * forked before secnet drops privilege.
521 * The grandchild is the same interface monitor helper script as used
522 * in the non-privsep case. But its lines are read by the child
523 * instead of by the main secnet. The child is responsible for
524 * creating the actual socket (binding it, etc.). Each socket is
525 * passed to secnet proper via fd passing, along with a data message
526 * describing the interface name and address. The child does not
527 * retain a list of current interfaces and addresses - it trusts the
528 * interface monitor to get that right. secnet proper still maintains
529 * that data structure.
531 * The result is that much of the non-privsep code can be reused, but
532 * just plumbed together differently.
534 * The child does not retain the socket after passingn it on.
535 * Interface removals are handled similarly but without any fd.
537 * The result is that the configuration's limits on which interfaces
538 * and ports secnet may use are enforced by the privileged child.
541 struct privsep_mdata {
547 static void papp_bad(struct polypath *st, void *badctx, const char *m, int ev)
549 const struct privsep_mdata *mdata=(const void*)st->lbuf.start;
550 const char *addr_str=badctx;
552 lg_perror(LG,M_WARNING,ev,
553 "error processing polypath address change %s %s [%s]: %s",
554 mdata->add ? "+" : "-",
555 mdata->ifname, addr_str, m);
558 static void polypath_afterpoll_privsep(void *state, struct pollfd *fds,
560 /* In secnet proper; receives messages from child. */
562 struct polypath *st=state;
566 int revents=fds[0].revents;
568 const char *badbit=pollbadbit(revents);
569 if (badbit) subproc_problem(st,async_linebuf_broken,badbit);
571 if (!(revents & POLLIN)) return;
574 if (st->lbuf.size==sizeof(struct privsep_mdata)) {
575 const struct privsep_mdata *mdata=(const void*)st->lbuf.start;
576 if (mdata->add && st->privsep_incoming_fd<0)
577 fatal("polypath (privsep): got add message data but no fd");
578 if (!mdata->add && st->privsep_incoming_fd>=0)
579 fatal("polypath (privsep): got remove message data with fd");
580 if (!memchr(mdata->ifname,0,sizeof(mdata->ifname)))
581 fatal("polypath (privsep): got message data but no newline");
582 int af=mdata->ia.sa.sa_family;
583 if (!(af==AF_INET6 || af==AF_INET))
584 fatal("polypath (privsep): got message data but bad AF %d",af);
585 const char *addr_str=iaddr_to_string(&mdata->ia);
586 polypath_record_ifaddr(st,papp_bad,(void*)addr_str,
587 mdata->add,mdata->ifname,addr_str,
588 &mdata->ia, st->privsep_incoming_fd);
589 st->privsep_incoming_fd=-1;
594 size_t cmsgdatalen=sizeof(fd);
595 char cmsg_control_buf[CMSG_SPACE(cmsgdatalen)];
602 iov.iov_base=st->lbuf.start+st->lbuf.size;
603 iov.iov_len=sizeof(struct privsep_mdata)-st->lbuf.size;
605 if (st->privsep_incoming_fd<0) {
606 msg.msg_control=cmsg_control_buf;
607 msg.msg_controllen=sizeof(cmsg_control_buf);
610 ssize_t got=recvmsg(st->monitor_fd,&msg,0);
612 if (errno==EINTR) continue;
613 if (iswouldblock(errno)) break;
614 fatal_perror("polypath (privsep): recvmsg failed");
617 subproc_problem(st,async_linebuf_eof,0);
621 if (msg.msg_controllen) {
622 size_t cmsgdatalen=sizeof(st->privsep_incoming_fd);
623 struct cmsghdr *h=CMSG_FIRSTHDR(&msg);
624 if (!(st->privsep_incoming_fd==-1 &&
626 h->cmsg_level==SOL_SOCKET &&
627 h->cmsg_type==SCM_RIGHTS &&
628 h->cmsg_len==CMSG_LEN(cmsgdatalen) &&
629 !CMSG_NXTHDR(&msg,h)))
630 subproc_problem(st,async_linebuf_broken,"bad cmsg");
631 memcpy(&st->privsep_incoming_fd,CMSG_DATA(h),cmsgdatalen);
632 assert(st->privsep_incoming_fd>=0);
638 static void privsep_handle_ifaddr(struct polypath *st,
639 bad_fn_type *bad, void *badctx,
640 bool_t add, const char *ifname,
642 const union iaddr *ia, int fd_dummy)
643 /* In child: handles discovered wanted interfaces, making sockets
644 and sending them to secnet proper. */
648 struct udpsock us={ .fd=-1 };
649 size_t cmsgdatalen=sizeof(us.fd);
650 char cmsg_control_buf[CMSG_SPACE(cmsgdatalen)];
652 assert(fd_dummy==-1);
654 struct privsep_mdata mdata;
658 size_t l=strlen(ifname);
659 if (l>=sizeof(mdata.ifname)) BAD("interface name too long");
660 strcpy(mdata.ifname,ifname);
662 COPY_OBJ(mdata.ia,*ia);
665 iov.iov_len =sizeof(mdata);
672 COPY_OBJ(us.addr,*ia);
673 bool_t ok=polypath_make_socket(st,bad,badctx,&us,ifname);
676 msg.msg_control=cmsg_control_buf;
677 msg.msg_controllen=sizeof(cmsg_control_buf);
679 struct cmsghdr *h=CMSG_FIRSTHDR(&msg);
680 h->cmsg_level=SOL_SOCKET;
681 h->cmsg_type =SCM_RIGHTS;
682 h->cmsg_len =CMSG_LEN(cmsgdatalen);
683 memcpy(CMSG_DATA(h),&us.fd,cmsgdatalen);
686 while (iov.iov_len) {
687 ssize_t got=sendmsg(st->privsep_ipcsock_fd,&msg,0);
689 if (errno!=EINTR) fatal_perror("polypath privsep sendmsg");
693 assert((size_t)got<=iov.iov_len);
695 iov.iov_base=(char*)iov.iov_base+got;
698 msg.msg_controllen=0;
702 if (us.fd>=0) close(us.fd);
705 static void child_privsep(struct polypath *st, int ipcsockfd)
706 /* Privsep child main loop. */
708 struct pollfd fds[2];
710 enter_phase(PHASE_CHILDPERSIST);
712 st->privsep_ipcsock_fd=ipcsockfd;
713 start_subproc(st,pipe_cloexec,child_monitor,
714 "interface monitor (grandchild)");
717 int r=polypath_beforepoll(st,fds,&nfds,0);
721 fds[1].fd=st->privsep_ipcsock_fd;
722 fds[1].events=POLLIN;
724 r=poll(fds,ARRAY_SIZE(fds),-1);
727 if (errno==EINTR) continue;
728 fatal_perror("polypath privsep poll");
730 if (fds[1].revents) {
731 if (fds[1].revents & (POLLHUP|POLLIN)) {
732 polypath_phase_shutdown(st,PHASE_SHUTDOWN);
735 fatal("polypath privsep poll parent socket revents=%#x",
738 afterpoll_monitor(st,fds,privsep_handle_ifaddr);
742 static void privsep_socketpair(int *fd)
744 int r=socketpair(AF_UNIX,SOCK_STREAM,0,fd);
745 if (r) fatal_perror("socketpair(AF_UNIX,SOCK_STREAM,,)");
750 static void polypath_phase_startprivsep(void *sst, uint32_t newphase)
752 struct polypath *st=sst;
754 if (!will_droppriv()) {
755 add_hook(PHASE_RUN, polypath_phase_startmonitor,st);
759 start_subproc(st,privsep_socketpair,child_privsep,
760 "socket generator (privsep interface handler)");
763 buffer_destroy(&st->lbuf);
764 buffer_new(&st->lbuf,sizeof(struct privsep_mdata));
765 BUF_ALLOC(&st->lbuf,"polypath mdata buf");
766 st->privsep_incoming_fd=-1;
768 register_for_poll(st,polypath_beforepoll,
769 polypath_afterpoll_privsep,"polypath");
772 static void polypath_phase_shutdown(void *sst, uint32_t newphase)
774 struct polypath *st=sst;
775 if (st->monitor_pid) {
776 assert(st->monitor_pid>0);
777 kill(st->monitor_pid,SIGTERM);
781 static void polypath_phase_childpersist(void *sst, uint32_t newphase)
783 struct polypath *st=sst;
784 struct interf *interf;
786 LIST_FOREACH(interf,&st->interfs,entry)
787 udp_socks_childpersist(&st->uc,&interf->socks);
793 /*----- generic closure and module setup -----*/
795 static list_t *polypath_apply(closure_t *self, struct cloc loc,
796 dict_t *context, list_t *args)
800 COMM_APPLY(st,&st->uc.cc,polypath_,"polypath",loc);
801 COMM_APPLY_STANDARD(st,&st->uc.cc,"polypath",args);
802 UDP_APPLY_STANDARD(st,&st->uc,"polypath");
804 struct udpcommon *uc=&st->uc;
805 struct commcommon *cc=&uc->cc;
807 uc->authbind=dict_read_string(d,"authbind",False,"udp",cc->loc);
808 st->max_interfs=dict_read_number(d,"max-interfaces",False,"polypath",loc,3);
810 st->ifname_pats=dict_read_string_array(d,"interfaces",False,"polypath",
812 st->permit_loopback=0; /* ifname_wanted reads this */
813 ifname_wanted(st,st->uc.cc.loc,"dummy"); /* walks and checks */
815 st->monitor_command=dict_read_string_array(d,"monitor-command",False,
816 "polypath",cc->loc, default_monitor_command);
817 if (!st->monitor_command[0])
818 cfgfatal(loc,"tun","no polypath interface monitor-command"
819 " (polypath unsupported on this platform?)\n");
821 st->permit_loopback=dict_read_bool(d,"permit-loopback",False,
822 "polypath",cc->loc,False);
824 LIST_INIT(&st->interfs);
825 buffer_new(&st->lbuf,ADNS_ADDR2TEXT_BUFLEN+100);
826 BUF_ALLOC(&st->lbuf,"polypath lbuf");
831 add_hook(PHASE_GETRESOURCES, polypath_phase_startprivsep,st);
833 add_hook(PHASE_SHUTDOWN, polypath_phase_shutdown, st);
834 add_hook(PHASE_CHILDPERSIST,polypath_phase_childpersist,st);
836 return new_closure(&cc->cl);
839 #endif /* CONFIG_IPV6 */
841 void polypath_module(dict_t *dict)
844 add_closure(dict,"polypath",polypath_apply);
845 #endif /* CONFIG_IPV6 */