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,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 const char *ifaddr
=space
+1;
188 badctx
->undospace
=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,m) \
212 if (IN6_IS_ADDR_##X(i6)) DONT("IPv6 address is " m)
213 DONTKIND(UNSPECIFIED
, "unspecified");
214 DONTKIND(MULTICAST
, "multicast" );
215 DONTKIND(LINKLOCAL
, "link local" );
216 DONTKIND(SITELOCAL
, "site local" );
217 DONTKIND(V4MAPPED
, "v4-mapped" );
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
)
263 #ifdef POLYPATH_DEBUG
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 udp_socks_register(&st
->uc
,&interf
->socks
);
325 interf
->name
=strdup(ifname
);
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 FILLZERO(us
->experienced
);
343 interf
->socks
.n_socks
++;
344 us
=0; /* do not destroy this socket during `out' */
345 lg_perror(LG
,M_INFO
,0,"using %s %s",ifname
,ifaddr
);
348 for (i
=0; i
<interf
->socks
.n_socks
; i
++)
349 if (!memcmp(&interf
->socks
.socks
[i
].addr
,ia
,sizeof(*ia
)))
350 goto address_remove_found
;
351 BAD("address to remove not found");
352 address_remove_found
:
353 lg_perror(LG
,M_INFO
,0,"removed %s %s",ifname
,ifaddr
);
354 udp_destroy_socket(&st
->uc
,&interf
->socks
.socks
[i
]);
355 interf
->socks
.socks
[i
]=
356 interf
->socks
.socks
[--interf
->socks
.n_socks
];
361 udp_destroy_socket(uc
,us
);
364 if (interf
&& !interf
->socks
.n_socks
) {
365 udp_socks_deregister(&st
->uc
,&interf
->socks
);
366 LIST_REMOVE(interf
,entry
);
374 static void subproc_problem(struct polypath
*st
,
375 enum async_linebuf_result alr
, const char *emsg
)
378 assert(st
->monitor_pid
);
380 pid_t gotpid
=waitpid(st
->monitor_pid
,&status
,WNOHANG
);
381 if (gotpid
==st
->monitor_pid
) {
383 lg_exitstatus(LG
,M_FATAL
,status
,"interface monitor");
385 lg_perror(LG
,M_ERR
,errno
,"unable to reap interface monitor");
389 if (alr
==async_linebuf_eof
)
390 lg_perror(LG
,M_FATAL
,0,"unexpected EOF from interface monitor");
392 lg_perror(LG
,M_FATAL
,0,"bad output from interface monitor: %s",emsg
);
393 assert(!"not reached");
396 /* Used in non-privsep case, and in privsep child */
397 static void afterpoll_monitor(struct polypath
*st
, struct pollfd
*fd
,
398 polypath_ppml_callback_type
*callback
)
400 enum async_linebuf_result alr
;
403 while ((alr
=async_linebuf_read(fd
,&st
->lbuf
,&emsg
)) == async_linebuf_ok
)
404 polypath_process_monitor_line(st
,st
->lbuf
.base
,callback
);
406 if (alr
==async_linebuf_nothing
)
409 subproc_problem(st
,alr
,emsg
);
412 /* Used in non-privsep case only - glue for secnet main loop */
413 static void polypath_afterpoll_monitor(void *state
, struct pollfd
*fds
,
416 struct polypath
*st
=state
;
418 afterpoll_monitor(st
,fds
,polypath_record_ifaddr
);
421 /* Actual udp packet sending work */
422 static bool_t
polypath_sendmsg(void *commst
, struct buffer_if
*buf
,
423 const struct comm_addr
*dest
)
425 struct polypath
*st
=commst
;
426 struct interf
*interf
;
427 bool_t allreasonable
=True
;
428 int af
=dest
->ia
.sa
.sa_family
;
430 LIST_FOREACH(interf
,&st
->interfs
,entry
) {
432 bool_t attempted
=False
, reasonable
=False
;
433 for (i
=0; i
<interf
->socks
.n_socks
; i
++) {
434 struct udpsock
*us
=&interf
->socks
.socks
[i
];
435 if (af
!= us
->addr
.sa
.sa_family
)
438 int r
=sendto(us
->fd
,buf
->start
,buf
->size
,
439 0,&dest
->ia
.sa
,iaddr_socklen(&dest
->ia
));
440 udp_sock_experienced(0,&st
->uc
, interf
->name
,us
,
446 if (!(errno
==EAFNOSUPPORT
|| errno
==ENETUNREACH
))
448 lg_perror(LG
,M_DEBUG
,errno
,"%s [%s] xmit %"PRIu32
" bytes to %s",
449 interf
->name
,iaddr_to_string(&us
->addr
),
450 buf
->size
,iaddr_to_string(&dest
->ia
));
453 if (!interf
->experienced_xmit_noaf
[af
]++)
454 lg_perror(LG
,M_WARNING
,0,
455 "%s has no suitable address to transmit %s",
456 interf
->name
, af_name(af
));
457 allreasonable
*= reasonable
;
459 return allreasonable
;
462 /* Non-privsep: called in (sole) child. Privsep: in grandchild. */
463 static void child_monitor(struct polypath
*st
, int childfd
)
466 execvp(st
->monitor_command
[0],(char**)st
->monitor_command
);
467 fprintf(stderr
,"secnet: cannot execute %s: %s\n",
468 st
->monitor_command
[0], strerror(errno
));
472 /* General utility function. */
473 static void start_subproc(struct polypath
*st
, void (*make_fdpair
)(int[2]),
474 void (*child
)(struct polypath
*st
, int childfd
),
479 assert(!st
->monitor_pid
);
480 assert(st
->monitor_fd
<0);
492 fatal_perror("%s: failed to fork for interface monitoring",
493 st
->uc
.cc
.cl
.description
);
497 st
->monitor_fd
=pfds
[0];
498 setnonblock(st
->monitor_fd
);
500 lg_perror(LG
,M_NOTICE
,0, "%s: spawning %s [pid %ld]",
501 st
->uc
.cc
.cl
.description
, desc
, (long)st
->monitor_pid
);
504 /* Non-privsep only: glue for forking the monitor, from the main loop */
505 static void polypath_phase_startmonitor(void *sst
, uint32_t newphase
)
507 struct polypath
*st
=sst
;
508 start_subproc(st
,pipe_cloexec
,child_monitor
,
509 "interface monitor (no privsep)");
510 register_for_poll(st
,polypath_beforepoll
,
511 polypath_afterpoll_monitor
,"polypath");
514 /*----- Privsep-only: -----*/
517 * We use two subprocesses, a child and a grandchild. These are
518 * forked before secnet drops privilege.
520 * The grandchild is the same interface monitor helper script as used
521 * in the non-privsep case. But its lines are read by the child
522 * instead of by the main secnet. The child is responsible for
523 * creating the actual socket (binding it, etc.). Each socket is
524 * passed to secnet proper via fd passing, along with a data message
525 * describing the interface name and address. The child does not
526 * retain a list of current interfaces and addresses - it trusts the
527 * interface monitor to get that right. secnet proper still maintains
528 * that data structure.
530 * The result is that much of the non-privsep code can be reused, but
531 * just plumbed together differently.
533 * The child does not retain the socket after passing it on.
534 * Interface removals are handled similarly but without any fd.
536 * The result is that the configuration's limits on which interfaces
537 * and ports secnet may use are enforced by the privileged child.
540 struct privsep_mdata
{
546 static void papp_bad(struct polypath
*st
, void *badctx
, const char *m
, int ev
)
548 const struct privsep_mdata
*mdata
=(const void*)st
->lbuf
.start
;
549 const char *addr_str
=badctx
;
551 lg_perror(LG
,M_WARNING
,ev
,
552 "error processing polypath address change %s %s [%s]: %s",
553 mdata
->add ?
"+" : "-",
554 mdata
->ifname
, addr_str
, m
);
557 static void polypath_afterpoll_privsep(void *state
, struct pollfd
*fds
,
559 /* In secnet proper; receives messages from child. */
561 struct polypath
*st
=state
;
565 int revents
=fds
[0].revents
;
567 const char *badbit
=pollbadbit(revents
);
568 if (badbit
) subproc_problem(st
,async_linebuf_broken
,badbit
);
570 if (!(revents
& POLLIN
)) return;
573 if (st
->lbuf
.size
==sizeof(struct privsep_mdata
)) {
574 const struct privsep_mdata
*mdata
=(const void*)st
->lbuf
.start
;
575 if (mdata
->add
&& st
->privsep_incoming_fd
<0)
576 fatal("polypath (privsep): got add message data but no fd");
577 if (!mdata
->add
&& st
->privsep_incoming_fd
>=0)
578 fatal("polypath (privsep): got remove message data with fd");
579 if (!memchr(mdata
->ifname
,0,sizeof(mdata
->ifname
)))
580 fatal("polypath (privsep): got ifname with no terminating nul");
581 int af
=mdata
->ia
.sa
.sa_family
;
582 if (!(af
==AF_INET6
|| af
==AF_INET
))
583 fatal("polypath (privsep): got message data but bad AF %d",af
);
584 const char *addr_str
=iaddr_to_string(&mdata
->ia
);
585 polypath_record_ifaddr(st
,papp_bad
,(void*)addr_str
,
586 mdata
->add
,mdata
->ifname
,addr_str
,
587 &mdata
->ia
, st
->privsep_incoming_fd
);
588 st
->privsep_incoming_fd
=-1;
593 size_t cmsgdatalen
=sizeof(fd
);
594 char cmsg_control_buf
[CMSG_SPACE(cmsgdatalen
)];
601 iov
.iov_base
=st
->lbuf
.start
+st
->lbuf
.size
;
602 iov
.iov_len
=sizeof(struct privsep_mdata
)-st
->lbuf
.size
;
604 if (st
->privsep_incoming_fd
<0) {
605 msg
.msg_control
=cmsg_control_buf
;
606 msg
.msg_controllen
=sizeof(cmsg_control_buf
);
609 ssize_t got
=recvmsg(st
->monitor_fd
,&msg
,0);
611 if (errno
==EINTR
) continue;
612 if (iswouldblock(errno
)) break;
613 fatal_perror("polypath (privsep): recvmsg failed");
616 subproc_problem(st
,async_linebuf_eof
,0);
620 if (msg
.msg_controllen
) {
621 size_t cmsgdatalen
=sizeof(st
->privsep_incoming_fd
);
622 struct cmsghdr
*h
=CMSG_FIRSTHDR(&msg
);
623 if (!(st
->privsep_incoming_fd
==-1 &&
625 h
->cmsg_level
==SOL_SOCKET
&&
626 h
->cmsg_type
==SCM_RIGHTS
&&
627 h
->cmsg_len
==CMSG_LEN(cmsgdatalen
) &&
628 !CMSG_NXTHDR(&msg
,h
)))
629 subproc_problem(st
,async_linebuf_broken
,"bad cmsg");
630 memcpy(&st
->privsep_incoming_fd
,CMSG_DATA(h
),cmsgdatalen
);
631 assert(st
->privsep_incoming_fd
>=0);
637 static void privsep_handle_ifaddr(struct polypath
*st
,
638 bad_fn_type
*bad
, void *badctx
,
639 bool_t add
, const char *ifname
,
641 const union iaddr
*ia
, int fd_dummy
)
642 /* In child: handles discovered wanted interfaces, making sockets
643 and sending them to secnet proper. */
647 struct udpsock us
={ .fd
=-1 };
648 size_t cmsgdatalen
=sizeof(us
.fd
);
649 char cmsg_control_buf
[CMSG_SPACE(cmsgdatalen
)];
651 assert(fd_dummy
==-1);
653 struct privsep_mdata mdata
;
657 size_t l
=strlen(ifname
);
658 if (l
>=sizeof(mdata
.ifname
)) BAD("interface name too long");
659 strcpy(mdata
.ifname
,ifname
);
661 COPY_OBJ(mdata
.ia
,*ia
);
664 iov
.iov_len
=sizeof(mdata
);
671 COPY_OBJ(us
.addr
,*ia
);
672 bool_t ok
=polypath_make_socket(st
,bad
,badctx
,&us
,ifname
);
675 msg
.msg_control
=cmsg_control_buf
;
676 msg
.msg_controllen
=sizeof(cmsg_control_buf
);
678 struct cmsghdr
*h
=CMSG_FIRSTHDR(&msg
);
679 h
->cmsg_level
=SOL_SOCKET
;
680 h
->cmsg_type
=SCM_RIGHTS
;
681 h
->cmsg_len
=CMSG_LEN(cmsgdatalen
);
682 memcpy(CMSG_DATA(h
),&us
.fd
,cmsgdatalen
);
685 while (iov
.iov_len
) {
686 ssize_t got
=sendmsg(st
->privsep_ipcsock_fd
,&msg
,0);
688 if (errno
!=EINTR
) fatal_perror("polypath privsep sendmsg");
692 assert((size_t)got
<=iov
.iov_len
);
694 iov
.iov_base
=(char*)iov
.iov_base
+got
;
697 msg
.msg_controllen
=0;
701 if (us
.fd
>=0) close(us
.fd
);
704 static void child_privsep(struct polypath
*st
, int ipcsockfd
)
705 /* Privsep child main loop. */
707 struct pollfd fds
[2];
709 enter_phase(PHASE_CHILDPERSIST
);
711 st
->privsep_ipcsock_fd
=ipcsockfd
;
712 start_subproc(st
,pipe_cloexec
,child_monitor
,
713 "interface monitor (grandchild)");
716 int r
=polypath_beforepoll(st
,fds
,&nfds
,0);
720 fds
[1].fd
=st
->privsep_ipcsock_fd
;
721 fds
[1].events
=POLLIN
;
723 r
=poll(fds
,ARRAY_SIZE(fds
),-1);
726 if (errno
==EINTR
) continue;
727 fatal_perror("polypath privsep poll");
729 if (fds
[1].revents
) {
730 if (fds
[1].revents
& (POLLHUP
|POLLIN
)) {
731 polypath_phase_shutdown(st
,PHASE_SHUTDOWN
);
734 fatal("polypath privsep poll parent socket revents=%#x",
737 if (fds
[0].revents
& POLLNVAL
)
738 fatal("polypath privsep poll child socket POLLNVAL");
739 afterpoll_monitor(st
,fds
,privsep_handle_ifaddr
);
743 static void privsep_socketpair(int *fd
)
745 int r
=socketpair(AF_UNIX
,SOCK_STREAM
,0,fd
);
746 if (r
) fatal_perror("socketpair(AF_UNIX,SOCK_STREAM,,)");
751 static void polypath_phase_startprivsep(void *sst
, uint32_t newphase
)
753 struct polypath
*st
=sst
;
755 if (!will_droppriv()) {
756 add_hook(PHASE_RUN
, polypath_phase_startmonitor
,st
);
760 start_subproc(st
,privsep_socketpair
,child_privsep
,
761 "socket generator (privsep interface handler)");
764 buffer_destroy(&st
->lbuf
);
765 buffer_new(&st
->lbuf
,sizeof(struct privsep_mdata
));
766 BUF_ALLOC(&st
->lbuf
,"polypath mdata buf");
767 st
->privsep_incoming_fd
=-1;
769 register_for_poll(st
,polypath_beforepoll
,
770 polypath_afterpoll_privsep
,"polypath");
773 static void polypath_phase_shutdown(void *sst
, uint32_t newphase
)
775 struct polypath
*st
=sst
;
776 if (st
->monitor_pid
) {
777 assert(st
->monitor_pid
>0);
778 kill(st
->monitor_pid
,SIGTERM
);
782 static void polypath_phase_childpersist(void *sst
, uint32_t newphase
)
784 struct polypath
*st
=sst
;
785 struct interf
*interf
;
787 LIST_FOREACH(interf
,&st
->interfs
,entry
)
788 udp_socks_childpersist(&st
->uc
,&interf
->socks
);
794 /*----- generic closure and module setup -----*/
796 static list_t
*polypath_apply(closure_t
*self
, struct cloc loc
,
797 dict_t
*context
, list_t
*args
)
801 COMM_APPLY(st
,&st
->uc
.cc
,polypath_
,"polypath",loc
);
802 COMM_APPLY_STANDARD(st
,&st
->uc
.cc
,"polypath",args
);
803 UDP_APPLY_STANDARD(st
,&st
->uc
,"polypath");
805 struct udpcommon
*uc
=&st
->uc
;
806 struct commcommon
*cc
=&uc
->cc
;
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
," "); /* try to check each pattern */
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
,"polypath","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 */