2 * send/receive module for secnet
3 * for multi-route setups */
5 * This file is part of secnet.
6 * See README for full list of copyright holders.
8 * secnet is free software; you can redistribute it and/or modify it
9 * under the terms of the GNU General Public License as published by
10 * the Free Software Foundation; either version 3 of the License, or
11 * (at your option) any later version.
13 * secnet is distributed in the hope that it will be useful, but
14 * WITHOUT ANY WARRANTY; without even the implied warranty of
15 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
16 * General Public License for more details.
18 * You should have received a copy of the GNU General Public License
19 * version 3 along with secnet; if not, see
20 * https://www.gnu.org/licenses/gpl.html.
25 #include "unaligned.h"
26 #include "comm-common.h"
34 static comm_sendmsg_fn polypath_sendmsg;
37 char *name; /* from malloc */
38 struct udpsocks socks;
39 bool_t experienced_xmit_noaf[MAX_AF+1];
40 LIST_ENTRY(interf) entry;
46 const char *const *ifname_pats;
47 const char *const *monitor_command;
48 bool_t permit_loopback;
49 LIST_HEAD(interf_list, interf) interfs_general;
50 struct interf_list interfs_dedicated;
51 struct buffer_if lbuf;
54 int privsep_incoming_fd;
55 int privsep_ipcsock_fd;
58 struct comm_clientinfo {
59 union iaddr dedicated; /* might be AF_UNSPEC */
62 static void polypath_phase_shutdown(void *sst, uint32_t newphase);
64 #define LG 0, st->uc.cc.cl.description, &st->uc.cc.loc
66 static const char *const default_loopback_ifname_pats[] = {
69 static const char *const default_ifname_pats[] = {
70 "!tun*","!tap*","!sl*","!userv*", "@hippo*", "*", 0
73 static const char *const default_monitor_command[] = {
75 DATAROOTDIR "/secnet/" "polypath-interface-monitor-linux", 0
81 static const char *polypath_addr_to_string(void *commst,
82 const struct comm_addr *ca)
84 static char sbuf[100];
86 snprintf(sbuf, sizeof(sbuf), "polypath:%s",
87 iaddr_to_string(&ca->ia));
91 static bool_t ifname_search_pats(struct polypath *st, struct cloc loc,
92 const char *ifname, char *want_io,
93 const char *const *pats) {
94 /* Returns True iff we found a list entry, in which case *want_io
95 * is set to the sense of that entry. Otherwise *want_io is set
96 * to the sense of the last entry, or unchanged if there were no pats. */
99 const char *const *pati;
100 for (pati=pats; *pati; pati++) {
101 const char *pat=*pati;
102 if (*pat=='!' || *pat=='+' || *pat=='@') { *want_io=*pat; pat++; }
103 else if (*pat=='*' || isalnum((unsigned char)*pat)) { *want_io='+'; }
104 else cfgfatal(loc,"polypath","invalid interface name pattern `%s'",pat);
105 int match=fnmatch(pat,ifname,0);
106 if (match==0) return True;
107 if (match!=FNM_NOMATCH)
108 cfgfatal(loc,"polypath","fnmatch failed! (pattern `%s')",pat);
113 static char ifname_wanted(struct polypath *st, struct cloc loc,
114 const char *ifname) {
115 char want='!'; /* pretend an empty cfg ends with !<doesn'tmatch> */
116 if (ifname_search_pats(st,loc,ifname,&want, st->ifname_pats))
118 if (want!='!') /* last pattern was positive, do not search default */
120 if (!st->permit_loopback &&
121 ifname_search_pats(st,loc,ifname,&want, default_loopback_ifname_pats))
123 if (ifname_search_pats(st,loc,ifname,&want, default_ifname_pats))
128 static struct comm_clientinfo *polypath_clientinfo(void *state,
129 dict_t *dict, struct cloc cloc) {
130 struct comm_clientinfo *clientinfo;
133 FILLZERO(*clientinfo);
134 clientinfo->dedicated.sa.sa_family=AF_UNSPEC;
136 item_t *item = dict_find_item(dict,"dedicated-interface-addr",
137 False,"polypath",cloc);
138 if (item) string_item_to_iaddr(item,0,&clientinfo->dedicated,
143 static int polypath_beforepoll(void *state, struct pollfd *fds, int *nfds_io,
146 struct polypath *st=state;
147 BEFOREPOLL_WANT_FDS(1);
148 fds[0].fd=st->monitor_fd;
149 fds[0].events=POLLIN;
153 static inline bool_t matches32(uint32_t word, uint32_t prefix, int prefixlen)
156 assert(prefixlen<=32);
157 uint32_t mask = ~(((uint32_t)1 << (32-prefixlen)) - 1);
158 assert(!(prefix & ~mask));
159 return (word & mask) == prefix;
162 /* These macros expect
163 * bad_fn_type *const bad;
168 #define BAD(m) do{ bad(st,badctx,M_WARNING,m,0); goto out; }while(0)
169 #define BADE(m,ev) do{ bad(st,badctx,M_WARNING,m,ev); goto out; }while(0)
170 typedef void bad_fn_type(struct polypath *st, void *badctx,
171 int mclass, const char* m, int ev);
173 typedef void polypath_ppml_callback_type(struct polypath *st,
174 bad_fn_type *bad, void *badctx,
175 bool_t add, char want,
176 const char *ifname, const char *ifaddr,
177 const union iaddr *ia, int fd /* -1 if none yet */);
179 struct ppml_bad_ctx {
184 static void ppml_bad(struct polypath *st, void *badctx,
185 int mclass, const char *m, int ev)
187 struct ppml_bad_ctx *bc=badctx;
189 *(bc->undospace)=' ';
190 lg_perror(LG,mclass,ev,
191 "error processing polypath state change: %s"
192 " (while processing `%s')",
196 static void polypath_process_monitor_line(struct polypath *st, char *orgl,
197 polypath_ppml_callback_type *callback)
198 /* always calls callback with fd==-1 */
200 struct udpcommon *uc=&st->uc;
202 bad_fn_type (*const bad)=ppml_bad;
203 struct ppml_bad_ctx badctx[1]={{
210 if (c=='+') add=True;
211 else if (c=='-') add=False;
216 if (c=='4') proto=AF_INET;
217 else if (c=='6') proto=AF_INET6;
218 else BAD("bad proto");
220 char *space=strchr(l,' ');
221 if (!space) BAD("no first space");
222 const char *ifname=space+1;
224 space=strchr(ifname,' ');
225 if (!space) BAD("no second space");
226 const char *ifaddr=space+1;
228 badctx->undospace=space;
232 socklen_t salen=sizeof(ia);
233 int r=adns_text2addr(ifaddr,uc->port, adns_qf_addrlit_ipv4_quadonly,
236 if (r) BADE("adns_text2addr",r);
237 if (ia.sa.sa_family!=proto) BAD("address family mismatch");
239 #define DONT(m) do{ \
241 lg_perror(LG,M_INFO,0,"ignoring %s [%s]: %s",ifname,ifaddr,m); \
245 char want=ifname_wanted(st,st->uc.cc.loc,ifname);
246 if (want=='!') DONT("unwanted interface name");
248 switch (ia.sa.sa_family) {
250 const struct in6_addr *i6=&ia.sin6.sin6_addr;
251 #define DONTKIND(X,m) \
252 if (IN6_IS_ADDR_##X(i6)) DONT("IPv6 address is " m)
253 DONTKIND(UNSPECIFIED, "unspecified");
254 DONTKIND(MULTICAST , "multicast" );
255 DONTKIND(LINKLOCAL , "link local" );
256 DONTKIND(SITELOCAL , "site local" );
257 DONTKIND(V4MAPPED , "v4-mapped" );
258 if (!st->permit_loopback)
259 DONTKIND(LOOPBACK , "loopback" );
261 #define DONTMASK(w7x,w6x,prefixlen,m) \
262 if (matches32(get_uint32(i6->s6_addr), \
263 ((uint32_t)0x##w7x << 16) | (uint32_t)0x##w6x, \
265 DONT("IPv6 address is " m)
266 DONTMASK( 100, 0, 8, "Discard-Only (RFC6666)");
267 DONTMASK(2001, 0, 23, "in IETF protocol block (RFC2928)");
268 DONTMASK(fc00, 0, 7, "Uniqe Local unicast (RFC4193)");
273 const uint32_t i4=htonl(ia.sin.sin_addr.s_addr);
274 if (i4==INADDR_ANY) DONT("IPv4 address is any/unspecified");
275 if (i4==INADDR_BROADCAST) DONT("IPv4 address is all hosts broadcast");
276 #define DONTMASK(b3,b2,b1,b0,prefixlen,m) do{ \
277 const uint8_t prefixbytes[4] = { (b3),(b2),(b1),(b0) }; \
278 if (matches32(i4,get_uint32(prefixbytes),prefixlen)) \
279 DONT("IPv4 address is " m); \
281 DONTMASK(169,254,0,0, 16, "link local");
282 DONTMASK(224, 0,0,0, 4, "multicast");
283 DONTMASK(192, 0,0,0, 24, "in IETF protocol block (RFC6890)");
284 DONTMASK(240, 0,0,0, 4, "in reserved addressing block (RFC1112)");
285 if (!st->permit_loopback)
286 DONTMASK(127, 0,0,0, 8, "loopback");
297 callback(st, bad,badctx, add,want, ifname,ifaddr,&ia,-1);
302 static void dump_pria(struct polypath *st, struct interf_list *interfs,
303 const char *ifname, char want)
305 #ifdef POLYPATH_DEBUG
306 struct interf *interf;
308 lg_perror(LG,M_DEBUG,0, "polypath record ifaddr `%s' (%c)",
310 LIST_FOREACH(interf, interfs, entry) {
311 lg_perror(LG,M_DEBUG,0, " polypath interface `%s', nsocks=%d",
312 interf->name, interf->socks.n_socks);
314 for (i=0; i<interf->socks.n_socks; i++) {
315 struct udpsock *us=&interf->socks.socks[i];
316 lg_perror(LG,M_DEBUG,0, " polypath sock fd=%d addr=%s",
317 us->fd, iaddr_to_string(&us->addr));
323 static bool_t polypath_make_socket(struct polypath *st,
324 bad_fn_type *bad, void *badctx,
325 struct udpsock *us, const char *ifname)
326 /* on error exit has called bad; might leave us->fd as -1 */
330 bool_t ok=udp_make_socket(&st->uc,us,M_WARNING);
331 if (!ok) BAD("unable to set up socket");
332 int r=setsockopt(us->fd,SOL_SOCKET,SO_BINDTODEVICE,
333 ifname,strlen(ifname)+1);
334 if (r) BADE("setsockopt(,,SO_BINDTODEVICE,)",errno);
341 static void polypath_record_ifaddr(struct polypath *st,
342 bad_fn_type *bad, void *badctx,
343 bool_t add, char want,
346 const union iaddr *ia, int fd)
348 struct udpcommon *uc=&st->uc;
349 struct interf *interf=0;
351 struct udpsock *us=0;
353 struct interf_list *interfs;
355 case '+': interfs=&st->interfs_general; max_interfs=st->max_interfs; break;
356 case '@': interfs=&st->interfs_dedicated; max_interfs=INT_MAX; break;
357 default: fatal("polypath: got bad want (%#x, %s)", want, ifname);
360 dump_pria(st,interfs,ifname,want);
363 LIST_FOREACH(interf,interfs,entry) {
364 if (!strcmp(interf->name,ifname))
369 if (n_ifs==max_interfs) BAD("too many interfaces");
370 interf=malloc(sizeof(*interf));
371 if (!interf) BADE("malloc for new interface",errno);
373 interf->socks.n_socks=0;
374 FILLZERO(interf->experienced_xmit_noaf);
375 LIST_INSERT_HEAD(interfs,interf,entry);
376 interf->name=strdup(ifname);
377 udp_socks_register(&st->uc,&interf->socks,interf->name);
378 if (!interf->name) BADE("strdup interface name",errno);
382 if (interf->socks.n_socks == UDP_MAX_SOCKETS)
383 BAD("too many addresses on this interface");
384 struct udpsock *us=&interf->socks.socks[interf->socks.n_socks];
386 COPY_OBJ(us->addr,*ia);
388 bool_t ok=polypath_make_socket(st,bad,badctx, us,ifname);
391 bool_t ok=udp_import_socket(uc,us,M_WARNING,fd);
395 interf->socks.n_socks++;
396 lg_perror(LG,M_INFO,0,"using %s %s",ifname,
397 iaddr_to_string(&us->addr));
398 us=0; /* do not destroy this socket during `out' */
401 for (i=0; i<interf->socks.n_socks; i++)
402 if (iaddr_equal(&interf->socks.socks[i].addr,ia,True))
403 goto address_remove_found;
404 bad(st,badctx,M_DEBUG,"address to remove not found",0);
406 address_remove_found:
407 lg_perror(LG,M_INFO,0,"removed %s %s",ifname,
408 iaddr_to_string(&interf->socks.socks[i].addr));
409 udp_destroy_socket(&st->uc,&interf->socks.socks[i]);
410 interf->socks.socks[i]=
411 interf->socks.socks[--interf->socks.n_socks];
416 udp_destroy_socket(uc,us);
419 if (interf && !interf->socks.n_socks) {
420 udp_socks_deregister(&st->uc,&interf->socks);
421 LIST_REMOVE(interf,entry);
426 dump_pria(st,interfs,0,0);
429 static void subproc_problem(struct polypath *st,
430 enum async_linebuf_result alr, const char *emsg)
433 assert(st->monitor_pid);
435 pid_t gotpid=waitpid(st->monitor_pid,&status,WNOHANG);
436 if (gotpid==st->monitor_pid) {
438 lg_exitstatus(LG,M_FATAL,status,"interface monitor");
440 lg_perror(LG,M_ERR,errno,"unable to reap interface monitor");
444 if (alr==async_linebuf_eof)
445 lg_perror(LG,M_FATAL,0,"unexpected EOF from interface monitor");
447 lg_perror(LG,M_FATAL,0,"bad output from interface monitor: %s",emsg);
448 assert(!"not reached");
451 /* Used in non-privsep case, and in privsep child */
452 static void afterpoll_monitor(struct polypath *st, struct pollfd *fd,
453 polypath_ppml_callback_type *callback)
455 enum async_linebuf_result alr;
458 while ((alr=async_linebuf_read(fd,&st->lbuf,&emsg)) == async_linebuf_ok)
459 polypath_process_monitor_line(st,st->lbuf.base,callback);
461 if (alr==async_linebuf_nothing)
464 subproc_problem(st,alr,emsg);
467 /* Used in non-privsep case only - glue for secnet main loop */
468 static void polypath_afterpoll_monitor(void *state, struct pollfd *fds,
471 struct polypath *st=state;
473 afterpoll_monitor(st,fds,polypath_record_ifaddr);
476 /* Actual udp packet sending work */
478 static void polypath_sendmsg_interf(struct polypath *st,
479 struct interf *interf,
480 struct buffer_if *buf,
481 const struct comm_addr *dest,
482 const union iaddr *dedicated,
483 bool_t *allreasonable)
486 int af=dest->ia.sa.sa_family;
487 bool_t wanted=False, attempted=False, reasonable=False;
489 for (i=0; i<interf->socks.n_socks; i++) {
490 struct udpsock *us=&interf->socks.socks[i];
491 if (dedicated && !iaddr_equal(dedicated, &us->addr, True))
494 if (af != us->addr.sa.sa_family)
497 int r=sendto(us->fd,buf->start,buf->size,
498 0,&dest->ia.sa,iaddr_socklen(&dest->ia));
499 udp_sock_experienced(0,&st->uc,&interf->socks,us,
500 &dest->ia,af, r,errno);
505 if (!(errno==EAFNOSUPPORT || errno==ENETUNREACH))
507 lg_perror(LG,M_DEBUG,errno,"%s [%s] xmit %"PRIu32" bytes to %s",
508 interf->name,iaddr_to_string(&us->addr),
509 buf->size,iaddr_to_string(&dest->ia));
515 if (!interf->experienced_xmit_noaf[af]++)
516 lg_perror(LG,M_WARNING,0,
517 "%s has no suitable address to transmit %s",
518 interf->name, af_name(af));
520 *allreasonable *= reasonable;
523 static bool_t polypath_sendmsg(void *commst, struct buffer_if *buf,
524 const struct comm_addr *dest,
525 struct comm_clientinfo *clientinfo)
527 struct polypath *st=commst;
528 struct interf *interf;
529 bool_t allreasonable=True;
531 LIST_FOREACH(interf,&st->interfs_general,entry) {
532 polypath_sendmsg_interf(st,interf,buf,dest,
535 if (clientinfo && clientinfo->dedicated.sa.sa_family != AF_UNSPEC) {
536 LIST_FOREACH(interf,&st->interfs_dedicated,entry) {
537 polypath_sendmsg_interf(st,interf,buf,dest,
538 &clientinfo->dedicated, &allreasonable);
541 return allreasonable;
544 /* Non-privsep: called in (sole) child. Privsep: in grandchild. */
545 static void child_monitor(struct polypath *st, int childfd)
548 execvp(st->monitor_command[0],(char**)st->monitor_command);
549 fprintf(stderr,"secnet: cannot execute %s: %s\n",
550 st->monitor_command[0], strerror(errno));
554 /* General utility function. */
555 static void start_subproc(struct polypath *st, void (*make_fdpair)(int[2]),
556 void (*child)(struct polypath *st, int childfd),
561 assert(!st->monitor_pid);
562 assert(st->monitor_fd<0);
574 fatal_perror("%s: failed to fork for interface monitoring",
575 st->uc.cc.cl.description);
579 st->monitor_fd=pfds[0];
580 setnonblock(st->monitor_fd);
582 lg_perror(LG,M_NOTICE,0, "%s: spawning %s [pid %ld]",
583 st->uc.cc.cl.description, desc, (long)st->monitor_pid);
586 /* Non-privsep only: glue for forking the monitor, from the main loop */
587 static void polypath_phase_startmonitor(void *sst, uint32_t newphase)
589 struct polypath *st=sst;
590 start_subproc(st,pipe_cloexec,child_monitor,
591 "interface monitor (no privsep)");
592 register_for_poll(st,polypath_beforepoll,
593 polypath_afterpoll_monitor,"polypath");
596 /*----- Privsep-only: -----*/
599 * We use two subprocesses, a child and a grandchild. These are
600 * forked before secnet drops privilege.
602 * The grandchild is the same interface monitor helper script as used
603 * in the non-privsep case. But its lines are read by the child
604 * instead of by the main secnet. The child is responsible for
605 * creating the actual socket (binding it, etc.). Each socket is
606 * passed to secnet proper via fd passing, along with a data message
607 * describing the interface name and address. The child does not
608 * retain a list of current interfaces and addresses - it trusts the
609 * interface monitor to get that right. secnet proper still maintains
610 * that data structure.
612 * The result is that much of the non-privsep code can be reused, but
613 * just plumbed together differently.
615 * The child does not retain the socket after passing it on.
616 * Interface removals are handled similarly but without any fd.
618 * The result is that the configuration's limits on which interfaces
619 * and ports secnet may use are enforced by the privileged child.
622 struct privsep_mdata {
626 char want; /* `+' or `@' */
629 static void papp_bad(struct polypath *st, void *badctx,
630 int mclass, const char *m, int ev)
632 const struct privsep_mdata *mdata=(const void*)st->lbuf.start;
633 const char *addr_str=badctx;
635 lg_perror(LG,mclass,ev,
636 "error processing polypath address change %s %s [%s]: %s",
637 mdata->add ? "+" : "-",
638 mdata->ifname, addr_str, m);
641 static void polypath_afterpoll_privsep(void *state, struct pollfd *fds,
643 /* In secnet proper; receives messages from child. */
645 struct polypath *st=state;
649 int revents=fds[0].revents;
651 const char *badbit=pollbadbit(revents);
652 if (badbit) subproc_problem(st,async_linebuf_broken,badbit);
654 if (!(revents & POLLIN)) return;
657 if (st->lbuf.size==sizeof(struct privsep_mdata)) {
658 const struct privsep_mdata *mdata=(const void*)st->lbuf.start;
659 if (mdata->add && st->privsep_incoming_fd<0)
660 fatal("polypath (privsep): got add message data but no fd");
661 if (!mdata->add && st->privsep_incoming_fd>=0)
662 fatal("polypath (privsep): got remove message data with fd");
663 if (!memchr(mdata->ifname,0,sizeof(mdata->ifname)))
664 fatal("polypath (privsep): got ifname with no terminating nul");
665 int af=mdata->ia.sa.sa_family;
666 if (!(af==AF_INET6 || af==AF_INET))
667 fatal("polypath (privsep): got message data but bad AF %d",af);
668 const char *addr_str=iaddr_to_string(&mdata->ia);
669 polypath_record_ifaddr(st,papp_bad,(void*)addr_str,
670 mdata->add,mdata->want,
671 mdata->ifname,addr_str,
672 &mdata->ia, st->privsep_incoming_fd);
673 st->privsep_incoming_fd=-1;
678 size_t cmsgdatalen=sizeof(fd);
679 char cmsg_control_buf[CMSG_SPACE(cmsgdatalen)];
686 iov.iov_base=st->lbuf.start+st->lbuf.size;
687 iov.iov_len=sizeof(struct privsep_mdata)-st->lbuf.size;
689 if (st->privsep_incoming_fd<0) {
690 msg.msg_control=cmsg_control_buf;
691 msg.msg_controllen=sizeof(cmsg_control_buf);
694 ssize_t got=recvmsg(st->monitor_fd,&msg,0);
696 if (errno==EINTR) continue;
697 if (iswouldblock(errno)) break;
698 fatal_perror("polypath (privsep): recvmsg failed");
701 subproc_problem(st,async_linebuf_eof,0);
705 if (msg.msg_controllen) {
706 size_t cmsgdatalen=sizeof(st->privsep_incoming_fd);
707 struct cmsghdr *h=CMSG_FIRSTHDR(&msg);
708 if (!(st->privsep_incoming_fd==-1 &&
710 h->cmsg_level==SOL_SOCKET &&
711 h->cmsg_type==SCM_RIGHTS &&
712 h->cmsg_len==CMSG_LEN(cmsgdatalen) &&
713 !CMSG_NXTHDR(&msg,h)))
714 subproc_problem(st,async_linebuf_broken,"bad cmsg");
715 memcpy(&st->privsep_incoming_fd,CMSG_DATA(h),cmsgdatalen);
716 assert(st->privsep_incoming_fd>=0);
722 static void privsep_handle_ifaddr(struct polypath *st,
723 bad_fn_type *bad, void *badctx,
724 bool_t add, char want,
727 const union iaddr *ia, int fd_dummy)
728 /* In child: handles discovered wanted interfaces, making sockets
729 and sending them to secnet proper. */
733 struct udpsock us={ .fd=-1 };
734 size_t cmsgdatalen=sizeof(us.fd);
735 char cmsg_control_buf[CMSG_SPACE(cmsgdatalen)];
737 assert(fd_dummy==-1);
739 struct privsep_mdata mdata;
743 size_t l=strlen(ifname);
744 if (l>=sizeof(mdata.ifname)) BAD("interface name too long");
745 strcpy(mdata.ifname,ifname);
748 COPY_OBJ(mdata.ia,*ia);
751 iov.iov_len =sizeof(mdata);
758 COPY_OBJ(us.addr,*ia);
759 bool_t ok=polypath_make_socket(st,bad,badctx,&us,ifname);
762 msg.msg_control=cmsg_control_buf;
763 msg.msg_controllen=sizeof(cmsg_control_buf);
765 struct cmsghdr *h=CMSG_FIRSTHDR(&msg);
766 h->cmsg_level=SOL_SOCKET;
767 h->cmsg_type =SCM_RIGHTS;
768 h->cmsg_len =CMSG_LEN(cmsgdatalen);
769 memcpy(CMSG_DATA(h),&us.fd,cmsgdatalen);
772 while (iov.iov_len) {
773 ssize_t got=sendmsg(st->privsep_ipcsock_fd,&msg,0);
775 if (errno!=EINTR) fatal_perror("polypath privsep sendmsg");
779 assert((size_t)got<=iov.iov_len);
781 iov.iov_base=(char*)iov.iov_base+got;
784 msg.msg_controllen=0;
788 if (us.fd>=0) close(us.fd);
791 static void child_privsep(struct polypath *st, int ipcsockfd)
792 /* Privsep child main loop. */
794 struct pollfd fds[2];
796 enter_phase(PHASE_CHILDPERSIST);
798 st->privsep_ipcsock_fd=ipcsockfd;
799 start_subproc(st,pipe_cloexec,child_monitor,
800 "interface monitor (grandchild)");
803 int r=polypath_beforepoll(st,fds,&nfds,0);
807 fds[1].fd=st->privsep_ipcsock_fd;
808 fds[1].events=POLLIN;
810 r=poll(fds,ARRAY_SIZE(fds),-1);
813 if (errno==EINTR) continue;
814 fatal_perror("polypath privsep poll");
816 if (fds[1].revents) {
817 if (fds[1].revents & (POLLHUP|POLLIN)) {
818 polypath_phase_shutdown(st,PHASE_SHUTDOWN);
821 fatal("polypath privsep poll parent socket revents=%#x",
824 if (fds[0].revents & POLLNVAL)
825 fatal("polypath privsep poll child socket POLLNVAL");
826 afterpoll_monitor(st,fds,privsep_handle_ifaddr);
830 static void privsep_socketpair(int *fd)
832 int r=socketpair(AF_UNIX,SOCK_STREAM,0,fd);
833 if (r) fatal_perror("socketpair(AF_UNIX,SOCK_STREAM,,)");
838 static void polypath_phase_startprivsep(void *sst, uint32_t newphase)
840 struct polypath *st=sst;
842 if (!will_droppriv()) {
843 add_hook(PHASE_RUN, polypath_phase_startmonitor,st);
847 start_subproc(st,privsep_socketpair,child_privsep,
848 "socket generator (privsep interface handler)");
851 buffer_destroy(&st->lbuf);
852 buffer_new(&st->lbuf,sizeof(struct privsep_mdata));
853 BUF_ALLOC(&st->lbuf,"polypath mdata buf");
854 st->privsep_incoming_fd=-1;
856 register_for_poll(st,polypath_beforepoll,
857 polypath_afterpoll_privsep,"polypath");
860 static void polypath_phase_shutdown(void *sst, uint32_t newphase)
862 struct polypath *st=sst;
863 if (st->monitor_pid) {
864 assert(st->monitor_pid>0);
865 kill(st->monitor_pid,SIGTERM);
869 static void polypath_phase_childpersist(void *sst, uint32_t newphase)
871 struct polypath *st=sst;
872 struct interf *interf;
874 LIST_FOREACH(interf,&st->interfs_general,entry)
875 udp_socks_childpersist(&st->uc,&interf->socks);
876 LIST_FOREACH(interf,&st->interfs_dedicated,entry)
877 udp_socks_childpersist(&st->uc,&interf->socks);
883 /*----- generic closure and module setup -----*/
885 static list_t *polypath_apply(closure_t *self, struct cloc loc,
886 dict_t *context, list_t *args)
890 COMM_APPLY(st,&st->uc.cc,polypath_,"polypath",loc);
891 COMM_APPLY_STANDARD(st,&st->uc.cc,"polypath",args);
892 UDP_APPLY_STANDARD(st,&st->uc,"polypath");
894 st->uc.cc.ops.clientinfo = polypath_clientinfo;
896 struct udpcommon *uc=&st->uc;
897 struct commcommon *cc=&uc->cc;
899 st->max_interfs=dict_read_number(d,"max-interfaces",False,"polypath",loc,3);
901 st->ifname_pats=dict_read_string_array(d,"interfaces",False,"polypath",
903 st->permit_loopback=0; /* ifname_wanted reads this */
904 ifname_wanted(st,st->uc.cc.loc," "); /* try to check each pattern */
906 st->monitor_command=dict_read_string_array(d,"monitor-command",False,
907 "polypath",cc->loc, default_monitor_command);
908 if (!st->monitor_command[0])
909 cfgfatal(loc,"polypath","no polypath interface monitor-command"
910 " (polypath unsupported on this platform?)\n");
912 st->permit_loopback=dict_read_bool(d,"permit-loopback",False,
913 "polypath",cc->loc,False);
915 LIST_INIT(&st->interfs_general);
916 LIST_INIT(&st->interfs_dedicated);
917 buffer_new(&st->lbuf,ADNS_ADDR2TEXT_BUFLEN+100);
918 BUF_ALLOC(&st->lbuf,"polypath lbuf");
923 add_hook(PHASE_GETRESOURCES, polypath_phase_startprivsep,st);
925 add_hook(PHASE_SHUTDOWN, polypath_phase_shutdown, st);
926 add_hook(PHASE_CHILDPERSIST,polypath_phase_childpersist,st);
928 return new_closure(&cc->cl);
931 #endif /* CONFIG_IPV6 */
933 void polypath_module(dict_t *dict)
936 add_closure(dict,"polypath",polypath_apply);
937 #endif /* CONFIG_IPV6 */