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 d 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"
33 static comm_sendmsg_fn polypath_sendmsg
;
36 char *name
; /* from malloc */
37 struct udpsocks socks
;
38 bool_t experienced_xmit_noaf
[MAX_AF
+1];
39 LIST_ENTRY(interf
) entry
;
45 const char *const *ifname_pats
;
46 const char *const *monitor_command
;
47 bool_t permit_loopback
;
48 LIST_HEAD(interf_list
, interf
) interfs
;
49 struct buffer_if lbuf
;
52 int privsep_incoming_fd
;
53 int privsep_ipcsock_fd
;
56 static void polypath_phase_shutdown(void *sst
, uint32_t newphase
);
58 #define LG 0, st->uc.cc.cl.description, &st->uc.cc.loc
60 static const char *const default_loopback_ifname_pats
[] = {
63 static const char *const default_ifname_pats
[] = {
64 "!tun*","!tap*","!sl*","!userv*", "*", 0
67 static const char *const default_monitor_command
[] = {
69 DATAROOTDIR
"/secnet/" "polypath-interface-monitor-linux", 0
75 static const char *polypath_addr_to_string(void *commst
,
76 const struct comm_addr
*ca
)
78 static char sbuf
[100];
80 snprintf(sbuf
, sizeof(sbuf
), "polypath:%s",
81 iaddr_to_string(&ca
->ia
));
85 static bool_t
ifname_search_pats(struct polypath
*st
, struct cloc loc
,
86 const char *ifname
, char *want_io
,
87 const char *const *pats
) {
88 /* Returns True iff we found a list entry, in which case *want_io
89 * is set to the sense of that entry. Otherwise *want_io is set
90 * to the sense of the last entry, or unchanged if there were no pats. */
93 const char *const *pati
;
94 for (pati
=pats
; *pati
; pati
++) {
95 const char *pat
=*pati
;
96 if (*pat
=='!' || *pat
=='+') { *want_io
=*pat
; pat
++; }
97 else if (*pat
=='*' || isalnum((unsigned char)*pat
)) { *want_io
='+'; }
98 else cfgfatal(loc
,"polypath","invalid interface name pattern `%s'",pat
);
99 int match
=fnmatch(pat
,ifname
,0);
100 if (match
==0) return True
;
101 if (match
!=FNM_NOMATCH
)
102 cfgfatal(loc
,"polypath","fnmatch failed! (pattern `%s')",pat
);
107 static char ifname_wanted(struct polypath
*st
, struct cloc loc
,
108 const char *ifname
) {
109 char want
='!'; /* pretend an empty cfg ends with !<doesn'tmatch> */
110 if (ifname_search_pats(st
,loc
,ifname
,&want
, st
->ifname_pats
))
112 if (want
!='!') /* last pattern was positive, do not search default */
114 if (!st
->permit_loopback
&&
115 ifname_search_pats(st
,loc
,ifname
,&want
, default_loopback_ifname_pats
))
117 if (ifname_search_pats(st
,loc
,ifname
,&want
, default_ifname_pats
))
122 static int polypath_beforepoll(void *state
, struct pollfd
*fds
, int *nfds_io
,
125 struct polypath
*st
=state
;
126 BEFOREPOLL_WANT_FDS(1);
127 fds
[0].fd
=st
->monitor_fd
;
128 fds
[0].events
=POLLIN
;
132 static inline bool_t
matches32(uint32_t word
, uint32_t prefix
, int prefixlen
)
135 assert(prefixlen
<=32);
136 uint32_t mask
= ~(((uint32_t)1 << (32-prefixlen
)) - 1);
137 assert(!(prefix
& ~mask
));
138 return (word
& mask
) == prefix
;
141 /* These macros expect
142 * bad_fn_type *const bad;
147 #define BAD(m) do{ bad(st,badctx,M_WARNING,m,0); goto out; }while(0)
148 #define BADE(m,ev) do{ bad(st,badctx,M_WARNING,m,ev); goto out; }while(0)
149 typedef void bad_fn_type(struct polypath
*st
, void *badctx
,
150 int mclass
, const char* m
, int ev
);
152 typedef void polypath_ppml_callback_type(struct polypath
*st
,
153 bad_fn_type
*bad
, void *badctx
,
154 bool_t add
, char want
,
155 const char *ifname
, const char *ifaddr
,
156 const union iaddr
*ia
, int fd
/* -1 if none yet */);
158 struct ppml_bad_ctx
{
163 static void ppml_bad(struct polypath
*st
, void *badctx
,
164 int mclass
, const char *m
, int ev
)
166 struct ppml_bad_ctx
*bc
=badctx
;
168 *(bc
->undospace
)=' ';
169 lg_perror(LG
,mclass
,ev
,
170 "error processing polypath state change: %s"
171 " (while processing `%s')",
175 static void polypath_process_monitor_line(struct polypath
*st
, char *orgl
,
176 polypath_ppml_callback_type
*callback
)
177 /* always calls callback with fd==-1 */
179 struct udpcommon
*uc
=&st
->uc
;
181 bad_fn_type (*const bad
)=ppml_bad
;
182 struct ppml_bad_ctx badctx
[1]={{
189 if (c
=='+') add
=True
;
190 else if (c
=='-') add
=False
;
195 if (c
=='4') proto
=AF_INET
;
196 else if (c
=='6') proto
=AF_INET6
;
197 else BAD("bad proto");
199 char *space
=strchr(l
,' ');
200 if (!space
) BAD("no first space");
201 const char *ifname
=space
+1;
203 space
=strchr(ifname
,' ');
204 if (!space
) BAD("no second space");
205 const char *ifaddr
=space
+1;
207 badctx
->undospace
=space
;
211 socklen_t salen
=sizeof(ia
);
212 int r
=adns_text2addr(ifaddr
,uc
->port
, adns_qf_addrlit_ipv4_quadonly
,
215 if (r
) BADE("adns_text2addr",r
);
216 if (ia
.sa
.sa_family
!=proto
) BAD("address family mismatch");
218 #define DONT(m) do{ \
220 lg_perror(LG,M_INFO,0,"ignoring %s [%s]: %s",ifname,ifaddr,m); \
224 char want
=ifname_wanted(st
,st
->uc
.cc
.loc
,ifname
);
225 if (want
=='!') DONT("unwanted interface name");
227 switch (ia
.sa
.sa_family
) {
229 const struct in6_addr
*i6
=&ia
.sin6
.sin6_addr
;
230 #define DONTKIND(X,m) \
231 if (IN6_IS_ADDR_##X(i6)) DONT("IPv6 address is " m)
232 DONTKIND(UNSPECIFIED
, "unspecified");
233 DONTKIND(MULTICAST
, "multicast" );
234 DONTKIND(LINKLOCAL
, "link local" );
235 DONTKIND(SITELOCAL
, "site local" );
236 DONTKIND(V4MAPPED
, "v4-mapped" );
237 if (!st
->permit_loopback
)
238 DONTKIND(LOOPBACK
, "loopback" );
240 #define DONTMASK(w7x,w6x,prefixlen,m) \
241 if (matches32(get_uint32(i6->s6_addr), \
242 ((uint32_t)0x##w7x << 16) | (uint32_t)0x##w6x, \
244 DONT("IPv6 address is " m)
245 DONTMASK( 100, 0, 8, "Discard-Only (RFC6666)");
246 DONTMASK(2001, 0, 23, "in IETF protocol block (RFC2928)");
247 DONTMASK(fc00
, 0, 7, "Uniqe Local unicast (RFC4193)");
252 const uint32_t i4
=htonl(ia
.sin
.sin_addr
.s_addr
);
253 if (i4
==INADDR_ANY
) DONT("IPv4 address is any/unspecified");
254 if (i4
==INADDR_BROADCAST
) DONT("IPv4 address is all hosts broadcast");
255 #define DONTMASK(b3,b2,b1,b0,prefixlen,m) do{ \
256 const uint8_t prefixbytes[4] = { (b3),(b2),(b1),(b0) }; \
257 if (matches32(i4,get_uint32(prefixbytes),prefixlen)) \
258 DONT("IPv4 address is " m); \
260 DONTMASK(169,254,0,0, 16, "link local");
261 DONTMASK(224, 0,0,0, 4, "multicast");
262 DONTMASK(192, 0,0,0, 24, "in IETF protocol block (RFC6890)");
263 DONTMASK(240, 0,0,0, 4, "in reserved addressing block (RFC1112)");
264 if (!st
->permit_loopback
)
265 DONTMASK(127, 0,0,0, 8, "loopback");
276 callback(st
, bad
,badctx
, add
,want
, ifname
,ifaddr
,&ia
,-1);
281 static void dump_pria(struct polypath
*st
, struct interf_list
*interfs
,
282 const char *ifname
, char want
)
284 #ifdef POLYPATH_DEBUG
285 struct interf
*interf
;
287 lg_perror(LG
,M_DEBUG
,0, "polypath record ifaddr `%s' (%c)",
289 LIST_FOREACH(interf
, interfs
, entry
) {
290 lg_perror(LG
,M_DEBUG
,0, " polypath interface `%s', nsocks=%d",
291 interf
->name
, interf
->socks
.n_socks
);
293 for (i
=0; i
<interf
->socks
.n_socks
; i
++) {
294 struct udpsock
*us
=&interf
->socks
.socks
[i
];
295 lg_perror(LG
,M_DEBUG
,0, " polypath sock fd=%d addr=%s",
296 us
->fd
, iaddr_to_string(&us
->addr
));
302 static bool_t
polypath_make_socket(struct polypath
*st
,
303 bad_fn_type
*bad
, void *badctx
,
304 struct udpsock
*us
, const char *ifname
)
305 /* on error exit has called bad; might leave us->fd as -1 */
309 bool_t ok
=udp_make_socket(&st
->uc
,us
,M_WARNING
);
310 if (!ok
) BAD("unable to set up socket");
311 int r
=setsockopt(us
->fd
,SOL_SOCKET
,SO_BINDTODEVICE
,
312 ifname
,strlen(ifname
)+1);
313 if (r
) BADE("setsockopt(,,SO_BINDTODEVICE,)",errno
);
320 static void polypath_record_ifaddr(struct polypath
*st
,
321 bad_fn_type
*bad
, void *badctx
,
322 bool_t add
, char want
,
325 const union iaddr
*ia
, int fd
)
327 struct udpcommon
*uc
=&st
->uc
;
328 struct interf
*interf
=0;
330 struct udpsock
*us
=0;
332 struct interf_list
*interfs
;
334 case '+': interfs
=&st
->interfs
; max_interfs
=st
->max_interfs
;
335 default: fatal("polypath: got bad want (%#x, %s)", want
, ifname
);
338 dump_pria(st
,interfs
,ifname
,want
);
341 LIST_FOREACH(interf
,interfs
,entry
) {
342 if (!strcmp(interf
->name
,ifname
))
347 if (n_ifs
==max_interfs
) BAD("too many interfaces");
348 interf
=malloc(sizeof(*interf
));
349 if (!interf
) BADE("malloc for new interface",errno
);
351 interf
->socks
.n_socks
=0;
352 FILLZERO(interf
->experienced_xmit_noaf
);
353 LIST_INSERT_HEAD(interfs
,interf
,entry
);
354 interf
->name
=strdup(ifname
);
355 udp_socks_register(&st
->uc
,&interf
->socks
,interf
->name
);
356 if (!interf
->name
) BADE("strdup interface name",errno
);
360 if (interf
->socks
.n_socks
== UDP_MAX_SOCKETS
)
361 BAD("too many addresses on this interface");
362 struct udpsock
*us
=&interf
->socks
.socks
[interf
->socks
.n_socks
];
364 COPY_OBJ(us
->addr
,*ia
);
366 bool_t ok
=polypath_make_socket(st
,bad
,badctx
, us
,ifname
);
369 bool_t ok
=udp_import_socket(uc
,us
,M_WARNING
,fd
);
373 interf
->socks
.n_socks
++;
374 lg_perror(LG
,M_INFO
,0,"using %s %s",ifname
,
375 iaddr_to_string(&us
->addr
));
376 us
=0; /* do not destroy this socket during `out' */
379 for (i
=0; i
<interf
->socks
.n_socks
; i
++)
380 if (iaddr_equal(&interf
->socks
.socks
[i
].addr
,ia
,True
))
381 goto address_remove_found
;
382 bad(st
,badctx
,M_DEBUG
,"address to remove not found",0);
384 address_remove_found
:
385 lg_perror(LG
,M_INFO
,0,"removed %s %s",ifname
,
386 iaddr_to_string(&interf
->socks
.socks
[i
].addr
));
387 udp_destroy_socket(&st
->uc
,&interf
->socks
.socks
[i
]);
388 interf
->socks
.socks
[i
]=
389 interf
->socks
.socks
[--interf
->socks
.n_socks
];
394 udp_destroy_socket(uc
,us
);
397 if (interf
&& !interf
->socks
.n_socks
) {
398 udp_socks_deregister(&st
->uc
,&interf
->socks
);
399 LIST_REMOVE(interf
,entry
);
404 dump_pria(st
,interfs
,0,0);
407 static void subproc_problem(struct polypath
*st
,
408 enum async_linebuf_result alr
, const char *emsg
)
411 assert(st
->monitor_pid
);
413 pid_t gotpid
=waitpid(st
->monitor_pid
,&status
,WNOHANG
);
414 if (gotpid
==st
->monitor_pid
) {
416 lg_exitstatus(LG
,M_FATAL
,status
,"interface monitor");
418 lg_perror(LG
,M_ERR
,errno
,"unable to reap interface monitor");
422 if (alr
==async_linebuf_eof
)
423 lg_perror(LG
,M_FATAL
,0,"unexpected EOF from interface monitor");
425 lg_perror(LG
,M_FATAL
,0,"bad output from interface monitor: %s",emsg
);
426 assert(!"not reached");
429 /* Used in non-privsep case, and in privsep child */
430 static void afterpoll_monitor(struct polypath
*st
, struct pollfd
*fd
,
431 polypath_ppml_callback_type
*callback
)
433 enum async_linebuf_result alr
;
436 while ((alr
=async_linebuf_read(fd
,&st
->lbuf
,&emsg
)) == async_linebuf_ok
)
437 polypath_process_monitor_line(st
,st
->lbuf
.base
,callback
);
439 if (alr
==async_linebuf_nothing
)
442 subproc_problem(st
,alr
,emsg
);
445 /* Used in non-privsep case only - glue for secnet main loop */
446 static void polypath_afterpoll_monitor(void *state
, struct pollfd
*fds
,
449 struct polypath
*st
=state
;
451 afterpoll_monitor(st
,fds
,polypath_record_ifaddr
);
454 /* Actual udp packet sending work */
456 static void polypath_sendmsg_interf(struct polypath
*st
,
457 struct interf
*interf
,
458 struct buffer_if
*buf
,
459 const struct comm_addr
*dest
,
460 bool_t
*allreasonable
)
463 int af
=dest
->ia
.sa
.sa_family
;
464 bool_t attempted
=False
, reasonable
=False
;
466 for (i
=0; i
<interf
->socks
.n_socks
; i
++) {
467 struct udpsock
*us
=&interf
->socks
.socks
[i
];
468 if (af
!= us
->addr
.sa
.sa_family
)
471 int r
=sendto(us
->fd
,buf
->start
,buf
->size
,
472 0,&dest
->ia
.sa
,iaddr_socklen(&dest
->ia
));
473 udp_sock_experienced(0,&st
->uc
,&interf
->socks
,us
,
474 &dest
->ia
,af
, r
,errno
);
479 if (!(errno
==EAFNOSUPPORT
|| errno
==ENETUNREACH
))
481 lg_perror(LG
,M_DEBUG
,errno
,"%s [%s] xmit %"PRIu32
" bytes to %s",
482 interf
->name
,iaddr_to_string(&us
->addr
),
483 buf
->size
,iaddr_to_string(&dest
->ia
));
486 if (!interf
->experienced_xmit_noaf
[af
]++)
487 lg_perror(LG
,M_WARNING
,0,
488 "%s has no suitable address to transmit %s",
489 interf
->name
, af_name(af
));
491 *allreasonable
*= reasonable
;
494 static bool_t
polypath_sendmsg(void *commst
, struct buffer_if
*buf
,
495 const struct comm_addr
*dest
,
496 struct comm_clientinfo
*clientinfo
)
498 struct polypath
*st
=commst
;
499 struct interf
*interf
;
500 bool_t allreasonable
=True
;
502 LIST_FOREACH(interf
,&st
->interfs
,entry
) {
503 polypath_sendmsg_interf(st
,interf
,buf
,dest
,
506 return allreasonable
;
509 /* Non-privsep: called in (sole) child. Privsep: in grandchild. */
510 static void child_monitor(struct polypath
*st
, int childfd
)
513 execvp(st
->monitor_command
[0],(char**)st
->monitor_command
);
514 fprintf(stderr
,"secnet: cannot execute %s: %s\n",
515 st
->monitor_command
[0], strerror(errno
));
519 /* General utility function. */
520 static void start_subproc(struct polypath
*st
, void (*make_fdpair
)(int[2]),
521 void (*child
)(struct polypath
*st
, int childfd
),
526 assert(!st
->monitor_pid
);
527 assert(st
->monitor_fd
<0);
539 fatal_perror("%s: failed to fork for interface monitoring",
540 st
->uc
.cc
.cl
.description
);
544 st
->monitor_fd
=pfds
[0];
545 setnonblock(st
->monitor_fd
);
547 lg_perror(LG
,M_NOTICE
,0, "%s: spawning %s [pid %ld]",
548 st
->uc
.cc
.cl
.description
, desc
, (long)st
->monitor_pid
);
551 /* Non-privsep only: glue for forking the monitor, from the main loop */
552 static void polypath_phase_startmonitor(void *sst
, uint32_t newphase
)
554 struct polypath
*st
=sst
;
555 start_subproc(st
,pipe_cloexec
,child_monitor
,
556 "interface monitor (no privsep)");
557 register_for_poll(st
,polypath_beforepoll
,
558 polypath_afterpoll_monitor
,"polypath");
561 /*----- Privsep-only: -----*/
564 * We use two subprocesses, a child and a grandchild. These are
565 * forked before secnet drops privilege.
567 * The grandchild is the same interface monitor helper script as used
568 * in the non-privsep case. But its lines are read by the child
569 * instead of by the main secnet. The child is responsible for
570 * creating the actual socket (binding it, etc.). Each socket is
571 * passed to secnet proper via fd passing, along with a data message
572 * describing the interface name and address. The child does not
573 * retain a list of current interfaces and addresses - it trusts the
574 * interface monitor to get that right. secnet proper still maintains
575 * that data structure.
577 * The result is that much of the non-privsep code can be reused, but
578 * just plumbed together differently.
580 * The child does not retain the socket after passing it on.
581 * Interface removals are handled similarly but without any fd.
583 * The result is that the configuration's limits on which interfaces
584 * and ports secnet may use are enforced by the privileged child.
587 struct privsep_mdata
{
591 char want
; /* `+', for now */
594 static void papp_bad(struct polypath
*st
, void *badctx
,
595 int mclass
, const char *m
, int ev
)
597 const struct privsep_mdata
*mdata
=(const void*)st
->lbuf
.start
;
598 const char *addr_str
=badctx
;
600 lg_perror(LG
,mclass
,ev
,
601 "error processing polypath address change %s %s [%s]: %s",
602 mdata
->add ?
"+" : "-",
603 mdata
->ifname
, addr_str
, m
);
606 static void polypath_afterpoll_privsep(void *state
, struct pollfd
*fds
,
608 /* In secnet proper; receives messages from child. */
610 struct polypath
*st
=state
;
614 int revents
=fds
[0].revents
;
616 const char *badbit
=pollbadbit(revents
);
617 if (badbit
) subproc_problem(st
,async_linebuf_broken
,badbit
);
619 if (!(revents
& POLLIN
)) return;
622 if (st
->lbuf
.size
==sizeof(struct privsep_mdata
)) {
623 const struct privsep_mdata
*mdata
=(const void*)st
->lbuf
.start
;
624 if (mdata
->add
&& st
->privsep_incoming_fd
<0)
625 fatal("polypath (privsep): got add message data but no fd");
626 if (!mdata
->add
&& st
->privsep_incoming_fd
>=0)
627 fatal("polypath (privsep): got remove message data with fd");
628 if (!memchr(mdata
->ifname
,0,sizeof(mdata
->ifname
)))
629 fatal("polypath (privsep): got ifname with no terminating nul");
630 int af
=mdata
->ia
.sa
.sa_family
;
631 if (!(af
==AF_INET6
|| af
==AF_INET
))
632 fatal("polypath (privsep): got message data but bad AF %d",af
);
633 const char *addr_str
=iaddr_to_string(&mdata
->ia
);
634 polypath_record_ifaddr(st
,papp_bad
,(void*)addr_str
,
635 mdata
->add
,mdata
->want
,
636 mdata
->ifname
,addr_str
,
637 &mdata
->ia
, st
->privsep_incoming_fd
);
638 st
->privsep_incoming_fd
=-1;
643 size_t cmsgdatalen
=sizeof(fd
);
644 char cmsg_control_buf
[CMSG_SPACE(cmsgdatalen
)];
651 iov
.iov_base
=st
->lbuf
.start
+st
->lbuf
.size
;
652 iov
.iov_len
=sizeof(struct privsep_mdata
)-st
->lbuf
.size
;
654 if (st
->privsep_incoming_fd
<0) {
655 msg
.msg_control
=cmsg_control_buf
;
656 msg
.msg_controllen
=sizeof(cmsg_control_buf
);
659 ssize_t got
=recvmsg(st
->monitor_fd
,&msg
,0);
661 if (errno
==EINTR
) continue;
662 if (iswouldblock(errno
)) break;
663 fatal_perror("polypath (privsep): recvmsg failed");
666 subproc_problem(st
,async_linebuf_eof
,0);
670 if (msg
.msg_controllen
) {
671 size_t cmsgdatalen
=sizeof(st
->privsep_incoming_fd
);
672 struct cmsghdr
*h
=CMSG_FIRSTHDR(&msg
);
673 if (!(st
->privsep_incoming_fd
==-1 &&
675 h
->cmsg_level
==SOL_SOCKET
&&
676 h
->cmsg_type
==SCM_RIGHTS
&&
677 h
->cmsg_len
==CMSG_LEN(cmsgdatalen
) &&
678 !CMSG_NXTHDR(&msg
,h
)))
679 subproc_problem(st
,async_linebuf_broken
,"bad cmsg");
680 memcpy(&st
->privsep_incoming_fd
,CMSG_DATA(h
),cmsgdatalen
);
681 assert(st
->privsep_incoming_fd
>=0);
687 static void privsep_handle_ifaddr(struct polypath
*st
,
688 bad_fn_type
*bad
, void *badctx
,
689 bool_t add
, char want
,
692 const union iaddr
*ia
, int fd_dummy
)
693 /* In child: handles discovered wanted interfaces, making sockets
694 and sending them to secnet proper. */
698 struct udpsock us
={ .fd
=-1 };
699 size_t cmsgdatalen
=sizeof(us
.fd
);
700 char cmsg_control_buf
[CMSG_SPACE(cmsgdatalen
)];
702 assert(fd_dummy
==-1);
704 struct privsep_mdata mdata
;
708 size_t l
=strlen(ifname
);
709 if (l
>=sizeof(mdata
.ifname
)) BAD("interface name too long");
710 strcpy(mdata
.ifname
,ifname
);
713 COPY_OBJ(mdata
.ia
,*ia
);
716 iov
.iov_len
=sizeof(mdata
);
723 COPY_OBJ(us
.addr
,*ia
);
724 bool_t ok
=polypath_make_socket(st
,bad
,badctx
,&us
,ifname
);
727 msg
.msg_control
=cmsg_control_buf
;
728 msg
.msg_controllen
=sizeof(cmsg_control_buf
);
730 struct cmsghdr
*h
=CMSG_FIRSTHDR(&msg
);
731 h
->cmsg_level
=SOL_SOCKET
;
732 h
->cmsg_type
=SCM_RIGHTS
;
733 h
->cmsg_len
=CMSG_LEN(cmsgdatalen
);
734 memcpy(CMSG_DATA(h
),&us
.fd
,cmsgdatalen
);
737 while (iov
.iov_len
) {
738 ssize_t got
=sendmsg(st
->privsep_ipcsock_fd
,&msg
,0);
740 if (errno
!=EINTR
) fatal_perror("polypath privsep sendmsg");
744 assert((size_t)got
<=iov
.iov_len
);
746 iov
.iov_base
=(char*)iov
.iov_base
+got
;
749 msg
.msg_controllen
=0;
753 if (us
.fd
>=0) close(us
.fd
);
756 static void child_privsep(struct polypath
*st
, int ipcsockfd
)
757 /* Privsep child main loop. */
759 struct pollfd fds
[2];
761 enter_phase(PHASE_CHILDPERSIST
);
763 st
->privsep_ipcsock_fd
=ipcsockfd
;
764 start_subproc(st
,pipe_cloexec
,child_monitor
,
765 "interface monitor (grandchild)");
768 int r
=polypath_beforepoll(st
,fds
,&nfds
,0);
772 fds
[1].fd
=st
->privsep_ipcsock_fd
;
773 fds
[1].events
=POLLIN
;
775 r
=poll(fds
,ARRAY_SIZE(fds
),-1);
778 if (errno
==EINTR
) continue;
779 fatal_perror("polypath privsep poll");
781 if (fds
[1].revents
) {
782 if (fds
[1].revents
& (POLLHUP
|POLLIN
)) {
783 polypath_phase_shutdown(st
,PHASE_SHUTDOWN
);
786 fatal("polypath privsep poll parent socket revents=%#x",
789 if (fds
[0].revents
& POLLNVAL
)
790 fatal("polypath privsep poll child socket POLLNVAL");
791 afterpoll_monitor(st
,fds
,privsep_handle_ifaddr
);
795 static void privsep_socketpair(int *fd
)
797 int r
=socketpair(AF_UNIX
,SOCK_STREAM
,0,fd
);
798 if (r
) fatal_perror("socketpair(AF_UNIX,SOCK_STREAM,,)");
803 static void polypath_phase_startprivsep(void *sst
, uint32_t newphase
)
805 struct polypath
*st
=sst
;
807 if (!will_droppriv()) {
808 add_hook(PHASE_RUN
, polypath_phase_startmonitor
,st
);
812 start_subproc(st
,privsep_socketpair
,child_privsep
,
813 "socket generator (privsep interface handler)");
816 buffer_destroy(&st
->lbuf
);
817 buffer_new(&st
->lbuf
,sizeof(struct privsep_mdata
));
818 BUF_ALLOC(&st
->lbuf
,"polypath mdata buf");
819 st
->privsep_incoming_fd
=-1;
821 register_for_poll(st
,polypath_beforepoll
,
822 polypath_afterpoll_privsep
,"polypath");
825 static void polypath_phase_shutdown(void *sst
, uint32_t newphase
)
827 struct polypath
*st
=sst
;
828 if (st
->monitor_pid
) {
829 assert(st
->monitor_pid
>0);
830 kill(st
->monitor_pid
,SIGTERM
);
834 static void polypath_phase_childpersist(void *sst
, uint32_t newphase
)
836 struct polypath
*st
=sst
;
837 struct interf
*interf
;
839 LIST_FOREACH(interf
,&st
->interfs
,entry
)
840 udp_socks_childpersist(&st
->uc
,&interf
->socks
);
846 /*----- generic closure and module setup -----*/
848 static list_t
*polypath_apply(closure_t
*self
, struct cloc loc
,
849 dict_t
*context
, list_t
*args
)
853 COMM_APPLY(st
,&st
->uc
.cc
,polypath_
,"polypath",loc
);
854 COMM_APPLY_STANDARD(st
,&st
->uc
.cc
,"polypath",args
);
855 UDP_APPLY_STANDARD(st
,&st
->uc
,"polypath");
857 struct udpcommon
*uc
=&st
->uc
;
858 struct commcommon
*cc
=&uc
->cc
;
860 st
->max_interfs
=dict_read_number(d
,"max-interfaces",False
,"polypath",loc
,3);
862 st
->ifname_pats
=dict_read_string_array(d
,"interfaces",False
,"polypath",
864 st
->permit_loopback
=0; /* ifname_wanted reads this */
865 ifname_wanted(st
,st
->uc
.cc
.loc
," "); /* try to check each pattern */
867 st
->monitor_command
=dict_read_string_array(d
,"monitor-command",False
,
868 "polypath",cc
->loc
, default_monitor_command
);
869 if (!st
->monitor_command
[0])
870 cfgfatal(loc
,"polypath","no polypath interface monitor-command"
871 " (polypath unsupported on this platform?)\n");
873 st
->permit_loopback
=dict_read_bool(d
,"permit-loopback",False
,
874 "polypath",cc
->loc
,False
);
876 LIST_INIT(&st
->interfs
);
877 buffer_new(&st
->lbuf
,ADNS_ADDR2TEXT_BUFLEN
+100);
878 BUF_ALLOC(&st
->lbuf
,"polypath lbuf");
883 add_hook(PHASE_GETRESOURCES
, polypath_phase_startprivsep
,st
);
885 add_hook(PHASE_SHUTDOWN
, polypath_phase_shutdown
, st
);
886 add_hook(PHASE_CHILDPERSIST
,polypath_phase_childpersist
,st
);
888 return new_closure(&cc
->cl
);
891 #endif /* CONFIG_IPV6 */
893 void polypath_module(dict_t
*dict
)
896 add_closure(dict
,"polypath",polypath_apply
);
897 #endif /* CONFIG_IPV6 */