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)");
228 DONTMASK(fc00
, 0, 7, "Uniqe Local unicast (RFC4193)");
233 const uint32_t i4
=htonl(ia
.sin
.sin_addr
.s_addr
);
234 if (i4
==INADDR_ANY
) DONT("IPv4 address is any/unspecified");
235 if (i4
==INADDR_BROADCAST
) DONT("IPv4 address is all hosts broadcast");
236 #define DONTMASK(b3,b2,b1,b0,prefixlen,m) do{ \
237 const uint8_t prefixbytes[4] = { (b3),(b2),(b1),(b0) }; \
238 if (matches32(i4,get_uint32(prefixbytes),prefixlen)) \
239 DONT("IPv4 address is " m); \
241 DONTMASK(169,254,0,0, 16, "link local");
242 DONTMASK(224, 0,0,0, 4, "multicast");
243 DONTMASK(192, 0,0,0, 24, "in IETF protocol block (RFC6890)");
244 DONTMASK(240, 0,0,0, 4, "in reserved addressing block (RFC1112)");
245 if (!st
->permit_loopback
)
246 DONTMASK(127, 0,0,0, 8, "loopback");
257 callback(st
, bad
,badctx
, add
,ifname
,ifaddr
,&ia
,-1);
262 static void dump_pria(struct polypath
*st
, const char *ifname
)
264 #ifdef POLYPATH_DEBUG
265 struct interf
*interf
;
267 lg_perror(LG
,M_DEBUG
,0, "polypath record ifaddr `%s'",ifname
);
268 LIST_FOREACH(interf
, &st
->interfs
, entry
) {
269 lg_perror(LG
,M_DEBUG
,0, " polypath interface `%s', nsocks=%d",
270 interf
->name
, interf
->socks
.n_socks
);
272 for (i
=0; i
<interf
->socks
.n_socks
; i
++) {
273 struct udpsock
*us
=&interf
->socks
.socks
[i
];
274 lg_perror(LG
,M_DEBUG
,0, " polypath sock fd=%d addr=%s",
275 us
->fd
, iaddr_to_string(&us
->addr
));
281 static bool_t
polypath_make_socket(struct polypath
*st
,
282 bad_fn_type
*bad
, void *badctx
,
283 struct udpsock
*us
, const char *ifname
)
284 /* on error exit has called bad; might leave us->fd as -1 */
288 bool_t ok
=udp_make_socket(&st
->uc
,us
,M_WARNING
);
289 if (!ok
) BAD("unable to set up socket");
290 int r
=setsockopt(us
->fd
,SOL_SOCKET
,SO_BINDTODEVICE
,
291 ifname
,strlen(ifname
)+1);
292 if (r
) BADE("setsockopt(,,SO_BINDTODEVICE,)",errno
);
299 static void polypath_record_ifaddr(struct polypath
*st
,
300 bad_fn_type
*bad
, void *badctx
,
301 bool_t add
, const char *ifname
,
303 const union iaddr
*ia
, int fd
)
305 struct udpcommon
*uc
=&st
->uc
;
306 struct interf
*interf
=0;
307 struct udpsock
*us
=0;
309 dump_pria(st
,ifname
);
312 LIST_FOREACH(interf
,&st
->interfs
,entry
) {
313 if (!strcmp(interf
->name
,ifname
))
318 if (n_ifs
==st
->max_interfs
) BAD("too many interfaces");
319 interf
=malloc(sizeof(*interf
));
320 if (!interf
) BADE("malloc for new interface",errno
);
322 interf
->socks
.n_socks
=0;
323 FILLZERO(interf
->experienced_xmit_noaf
);
324 LIST_INSERT_HEAD(&st
->interfs
,interf
,entry
);
325 interf
->name
=strdup(ifname
);
326 udp_socks_register(&st
->uc
,&interf
->socks
,interf
->name
);
327 if (!interf
->name
) BADE("strdup interface name",errno
);
331 if (interf
->socks
.n_socks
== UDP_MAX_SOCKETS
)
332 BAD("too many addresses on this interface");
333 struct udpsock
*us
=&interf
->socks
.socks
[interf
->socks
.n_socks
];
335 COPY_OBJ(us
->addr
,*ia
);
337 bool_t ok
=polypath_make_socket(st
,bad
,badctx
, us
,ifname
);
340 bool_t ok
=udp_import_socket(uc
,us
,M_WARNING
,fd
);
344 interf
->socks
.n_socks
++;
345 lg_perror(LG
,M_INFO
,0,"using %s %s",ifname
,
346 iaddr_to_string(&us
->addr
));
347 us
=0; /* do not destroy this socket during `out' */
350 for (i
=0; i
<interf
->socks
.n_socks
; i
++)
351 if (iaddr_equal(&interf
->socks
.socks
[i
].addr
,ia
,True
))
352 goto address_remove_found
;
353 BAD("address to remove not found");
354 address_remove_found
:
355 lg_perror(LG
,M_INFO
,0,"removed %s %s",ifname
,
356 iaddr_to_string(&interf
->socks
.socks
[i
].addr
));
357 udp_destroy_socket(&st
->uc
,&interf
->socks
.socks
[i
]);
358 interf
->socks
.socks
[i
]=
359 interf
->socks
.socks
[--interf
->socks
.n_socks
];
364 udp_destroy_socket(uc
,us
);
367 if (interf
&& !interf
->socks
.n_socks
) {
368 udp_socks_deregister(&st
->uc
,&interf
->socks
);
369 LIST_REMOVE(interf
,entry
);
377 static void subproc_problem(struct polypath
*st
,
378 enum async_linebuf_result alr
, const char *emsg
)
381 assert(st
->monitor_pid
);
383 pid_t gotpid
=waitpid(st
->monitor_pid
,&status
,WNOHANG
);
384 if (gotpid
==st
->monitor_pid
) {
386 lg_exitstatus(LG
,M_FATAL
,status
,"interface monitor");
388 lg_perror(LG
,M_ERR
,errno
,"unable to reap interface monitor");
392 if (alr
==async_linebuf_eof
)
393 lg_perror(LG
,M_FATAL
,0,"unexpected EOF from interface monitor");
395 lg_perror(LG
,M_FATAL
,0,"bad output from interface monitor: %s",emsg
);
396 assert(!"not reached");
399 /* Used in non-privsep case, and in privsep child */
400 static void afterpoll_monitor(struct polypath
*st
, struct pollfd
*fd
,
401 polypath_ppml_callback_type
*callback
)
403 enum async_linebuf_result alr
;
406 while ((alr
=async_linebuf_read(fd
,&st
->lbuf
,&emsg
)) == async_linebuf_ok
)
407 polypath_process_monitor_line(st
,st
->lbuf
.base
,callback
);
409 if (alr
==async_linebuf_nothing
)
412 subproc_problem(st
,alr
,emsg
);
415 /* Used in non-privsep case only - glue for secnet main loop */
416 static void polypath_afterpoll_monitor(void *state
, struct pollfd
*fds
,
419 struct polypath
*st
=state
;
421 afterpoll_monitor(st
,fds
,polypath_record_ifaddr
);
424 /* Actual udp packet sending work */
425 static bool_t
polypath_sendmsg(void *commst
, struct buffer_if
*buf
,
426 const struct comm_addr
*dest
)
428 struct polypath
*st
=commst
;
429 struct interf
*interf
;
430 bool_t allreasonable
=True
;
431 int af
=dest
->ia
.sa
.sa_family
;
433 LIST_FOREACH(interf
,&st
->interfs
,entry
) {
435 bool_t attempted
=False
, reasonable
=False
;
436 for (i
=0; i
<interf
->socks
.n_socks
; i
++) {
437 struct udpsock
*us
=&interf
->socks
.socks
[i
];
438 if (af
!= us
->addr
.sa
.sa_family
)
441 int r
=sendto(us
->fd
,buf
->start
,buf
->size
,
442 0,&dest
->ia
.sa
,iaddr_socklen(&dest
->ia
));
443 udp_sock_experienced(0,&st
->uc
,&interf
->socks
,us
,
444 &dest
->ia
,af
, r
,errno
);
449 if (!(errno
==EAFNOSUPPORT
|| errno
==ENETUNREACH
))
451 lg_perror(LG
,M_DEBUG
,errno
,"%s [%s] xmit %"PRIu32
" bytes to %s",
452 interf
->name
,iaddr_to_string(&us
->addr
),
453 buf
->size
,iaddr_to_string(&dest
->ia
));
456 if (!interf
->experienced_xmit_noaf
[af
]++)
457 lg_perror(LG
,M_WARNING
,0,
458 "%s has no suitable address to transmit %s",
459 interf
->name
, af_name(af
));
460 allreasonable
*= reasonable
;
462 return allreasonable
;
465 /* Non-privsep: called in (sole) child. Privsep: in grandchild. */
466 static void child_monitor(struct polypath
*st
, int childfd
)
469 execvp(st
->monitor_command
[0],(char**)st
->monitor_command
);
470 fprintf(stderr
,"secnet: cannot execute %s: %s\n",
471 st
->monitor_command
[0], strerror(errno
));
475 /* General utility function. */
476 static void start_subproc(struct polypath
*st
, void (*make_fdpair
)(int[2]),
477 void (*child
)(struct polypath
*st
, int childfd
),
482 assert(!st
->monitor_pid
);
483 assert(st
->monitor_fd
<0);
495 fatal_perror("%s: failed to fork for interface monitoring",
496 st
->uc
.cc
.cl
.description
);
500 st
->monitor_fd
=pfds
[0];
501 setnonblock(st
->monitor_fd
);
503 lg_perror(LG
,M_NOTICE
,0, "%s: spawning %s [pid %ld]",
504 st
->uc
.cc
.cl
.description
, desc
, (long)st
->monitor_pid
);
507 /* Non-privsep only: glue for forking the monitor, from the main loop */
508 static void polypath_phase_startmonitor(void *sst
, uint32_t newphase
)
510 struct polypath
*st
=sst
;
511 start_subproc(st
,pipe_cloexec
,child_monitor
,
512 "interface monitor (no privsep)");
513 register_for_poll(st
,polypath_beforepoll
,
514 polypath_afterpoll_monitor
,"polypath");
517 /*----- Privsep-only: -----*/
520 * We use two subprocesses, a child and a grandchild. These are
521 * forked before secnet drops privilege.
523 * The grandchild is the same interface monitor helper script as used
524 * in the non-privsep case. But its lines are read by the child
525 * instead of by the main secnet. The child is responsible for
526 * creating the actual socket (binding it, etc.). Each socket is
527 * passed to secnet proper via fd passing, along with a data message
528 * describing the interface name and address. The child does not
529 * retain a list of current interfaces and addresses - it trusts the
530 * interface monitor to get that right. secnet proper still maintains
531 * that data structure.
533 * The result is that much of the non-privsep code can be reused, but
534 * just plumbed together differently.
536 * The child does not retain the socket after passing it on.
537 * Interface removals are handled similarly but without any fd.
539 * The result is that the configuration's limits on which interfaces
540 * and ports secnet may use are enforced by the privileged child.
543 struct privsep_mdata
{
549 static void papp_bad(struct polypath
*st
, void *badctx
, const char *m
, int ev
)
551 const struct privsep_mdata
*mdata
=(const void*)st
->lbuf
.start
;
552 const char *addr_str
=badctx
;
554 lg_perror(LG
,M_WARNING
,ev
,
555 "error processing polypath address change %s %s [%s]: %s",
556 mdata
->add ?
"+" : "-",
557 mdata
->ifname
, addr_str
, m
);
560 static void polypath_afterpoll_privsep(void *state
, struct pollfd
*fds
,
562 /* In secnet proper; receives messages from child. */
564 struct polypath
*st
=state
;
568 int revents
=fds
[0].revents
;
570 const char *badbit
=pollbadbit(revents
);
571 if (badbit
) subproc_problem(st
,async_linebuf_broken
,badbit
);
573 if (!(revents
& POLLIN
)) return;
576 if (st
->lbuf
.size
==sizeof(struct privsep_mdata
)) {
577 const struct privsep_mdata
*mdata
=(const void*)st
->lbuf
.start
;
578 if (mdata
->add
&& st
->privsep_incoming_fd
<0)
579 fatal("polypath (privsep): got add message data but no fd");
580 if (!mdata
->add
&& st
->privsep_incoming_fd
>=0)
581 fatal("polypath (privsep): got remove message data with fd");
582 if (!memchr(mdata
->ifname
,0,sizeof(mdata
->ifname
)))
583 fatal("polypath (privsep): got ifname with no terminating nul");
584 int af
=mdata
->ia
.sa
.sa_family
;
585 if (!(af
==AF_INET6
|| af
==AF_INET
))
586 fatal("polypath (privsep): got message data but bad AF %d",af
);
587 const char *addr_str
=iaddr_to_string(&mdata
->ia
);
588 polypath_record_ifaddr(st
,papp_bad
,(void*)addr_str
,
589 mdata
->add
,mdata
->ifname
,addr_str
,
590 &mdata
->ia
, st
->privsep_incoming_fd
);
591 st
->privsep_incoming_fd
=-1;
596 size_t cmsgdatalen
=sizeof(fd
);
597 char cmsg_control_buf
[CMSG_SPACE(cmsgdatalen
)];
604 iov
.iov_base
=st
->lbuf
.start
+st
->lbuf
.size
;
605 iov
.iov_len
=sizeof(struct privsep_mdata
)-st
->lbuf
.size
;
607 if (st
->privsep_incoming_fd
<0) {
608 msg
.msg_control
=cmsg_control_buf
;
609 msg
.msg_controllen
=sizeof(cmsg_control_buf
);
612 ssize_t got
=recvmsg(st
->monitor_fd
,&msg
,0);
614 if (errno
==EINTR
) continue;
615 if (iswouldblock(errno
)) break;
616 fatal_perror("polypath (privsep): recvmsg failed");
619 subproc_problem(st
,async_linebuf_eof
,0);
623 if (msg
.msg_controllen
) {
624 size_t cmsgdatalen
=sizeof(st
->privsep_incoming_fd
);
625 struct cmsghdr
*h
=CMSG_FIRSTHDR(&msg
);
626 if (!(st
->privsep_incoming_fd
==-1 &&
628 h
->cmsg_level
==SOL_SOCKET
&&
629 h
->cmsg_type
==SCM_RIGHTS
&&
630 h
->cmsg_len
==CMSG_LEN(cmsgdatalen
) &&
631 !CMSG_NXTHDR(&msg
,h
)))
632 subproc_problem(st
,async_linebuf_broken
,"bad cmsg");
633 memcpy(&st
->privsep_incoming_fd
,CMSG_DATA(h
),cmsgdatalen
);
634 assert(st
->privsep_incoming_fd
>=0);
640 static void privsep_handle_ifaddr(struct polypath
*st
,
641 bad_fn_type
*bad
, void *badctx
,
642 bool_t add
, const char *ifname
,
644 const union iaddr
*ia
, int fd_dummy
)
645 /* In child: handles discovered wanted interfaces, making sockets
646 and sending them to secnet proper. */
650 struct udpsock us
={ .fd
=-1 };
651 size_t cmsgdatalen
=sizeof(us
.fd
);
652 char cmsg_control_buf
[CMSG_SPACE(cmsgdatalen
)];
654 assert(fd_dummy
==-1);
656 struct privsep_mdata mdata
;
660 size_t l
=strlen(ifname
);
661 if (l
>=sizeof(mdata
.ifname
)) BAD("interface name too long");
662 strcpy(mdata
.ifname
,ifname
);
664 COPY_OBJ(mdata
.ia
,*ia
);
667 iov
.iov_len
=sizeof(mdata
);
674 COPY_OBJ(us
.addr
,*ia
);
675 bool_t ok
=polypath_make_socket(st
,bad
,badctx
,&us
,ifname
);
678 msg
.msg_control
=cmsg_control_buf
;
679 msg
.msg_controllen
=sizeof(cmsg_control_buf
);
681 struct cmsghdr
*h
=CMSG_FIRSTHDR(&msg
);
682 h
->cmsg_level
=SOL_SOCKET
;
683 h
->cmsg_type
=SCM_RIGHTS
;
684 h
->cmsg_len
=CMSG_LEN(cmsgdatalen
);
685 memcpy(CMSG_DATA(h
),&us
.fd
,cmsgdatalen
);
688 while (iov
.iov_len
) {
689 ssize_t got
=sendmsg(st
->privsep_ipcsock_fd
,&msg
,0);
691 if (errno
!=EINTR
) fatal_perror("polypath privsep sendmsg");
695 assert((size_t)got
<=iov
.iov_len
);
697 iov
.iov_base
=(char*)iov
.iov_base
+got
;
700 msg
.msg_controllen
=0;
704 if (us
.fd
>=0) close(us
.fd
);
707 static void child_privsep(struct polypath
*st
, int ipcsockfd
)
708 /* Privsep child main loop. */
710 struct pollfd fds
[2];
712 enter_phase(PHASE_CHILDPERSIST
);
714 st
->privsep_ipcsock_fd
=ipcsockfd
;
715 start_subproc(st
,pipe_cloexec
,child_monitor
,
716 "interface monitor (grandchild)");
719 int r
=polypath_beforepoll(st
,fds
,&nfds
,0);
723 fds
[1].fd
=st
->privsep_ipcsock_fd
;
724 fds
[1].events
=POLLIN
;
726 r
=poll(fds
,ARRAY_SIZE(fds
),-1);
729 if (errno
==EINTR
) continue;
730 fatal_perror("polypath privsep poll");
732 if (fds
[1].revents
) {
733 if (fds
[1].revents
& (POLLHUP
|POLLIN
)) {
734 polypath_phase_shutdown(st
,PHASE_SHUTDOWN
);
737 fatal("polypath privsep poll parent socket revents=%#x",
740 if (fds
[0].revents
& POLLNVAL
)
741 fatal("polypath privsep poll child socket POLLNVAL");
742 afterpoll_monitor(st
,fds
,privsep_handle_ifaddr
);
746 static void privsep_socketpair(int *fd
)
748 int r
=socketpair(AF_UNIX
,SOCK_STREAM
,0,fd
);
749 if (r
) fatal_perror("socketpair(AF_UNIX,SOCK_STREAM,,)");
754 static void polypath_phase_startprivsep(void *sst
, uint32_t newphase
)
756 struct polypath
*st
=sst
;
758 if (!will_droppriv()) {
759 add_hook(PHASE_RUN
, polypath_phase_startmonitor
,st
);
763 start_subproc(st
,privsep_socketpair
,child_privsep
,
764 "socket generator (privsep interface handler)");
767 buffer_destroy(&st
->lbuf
);
768 buffer_new(&st
->lbuf
,sizeof(struct privsep_mdata
));
769 BUF_ALLOC(&st
->lbuf
,"polypath mdata buf");
770 st
->privsep_incoming_fd
=-1;
772 register_for_poll(st
,polypath_beforepoll
,
773 polypath_afterpoll_privsep
,"polypath");
776 static void polypath_phase_shutdown(void *sst
, uint32_t newphase
)
778 struct polypath
*st
=sst
;
779 if (st
->monitor_pid
) {
780 assert(st
->monitor_pid
>0);
781 kill(st
->monitor_pid
,SIGTERM
);
785 static void polypath_phase_childpersist(void *sst
, uint32_t newphase
)
787 struct polypath
*st
=sst
;
788 struct interf
*interf
;
790 LIST_FOREACH(interf
,&st
->interfs
,entry
)
791 udp_socks_childpersist(&st
->uc
,&interf
->socks
);
797 /*----- generic closure and module setup -----*/
799 static list_t
*polypath_apply(closure_t
*self
, struct cloc loc
,
800 dict_t
*context
, list_t
*args
)
804 COMM_APPLY(st
,&st
->uc
.cc
,polypath_
,"polypath",loc
);
805 COMM_APPLY_STANDARD(st
,&st
->uc
.cc
,"polypath",args
);
806 UDP_APPLY_STANDARD(st
,&st
->uc
,"polypath");
808 struct udpcommon
*uc
=&st
->uc
;
809 struct commcommon
*cc
=&uc
->cc
;
811 st
->max_interfs
=dict_read_number(d
,"max-interfaces",False
,"polypath",loc
,3);
813 st
->ifname_pats
=dict_read_string_array(d
,"interfaces",False
,"polypath",
815 st
->permit_loopback
=0; /* ifname_wanted reads this */
816 ifname_wanted(st
,st
->uc
.cc
.loc
," "); /* try to check each pattern */
818 st
->monitor_command
=dict_read_string_array(d
,"monitor-command",False
,
819 "polypath",cc
->loc
, default_monitor_command
);
820 if (!st
->monitor_command
[0])
821 cfgfatal(loc
,"polypath","no polypath interface monitor-command"
822 " (polypath unsupported on this platform?)\n");
824 st
->permit_loopback
=dict_read_bool(d
,"permit-loopback",False
,
825 "polypath",cc
->loc
,False
);
827 LIST_INIT(&st
->interfs
);
828 buffer_new(&st
->lbuf
,ADNS_ADDR2TEXT_BUFLEN
+100);
829 BUF_ALLOC(&st
->lbuf
,"polypath lbuf");
834 add_hook(PHASE_GETRESOURCES
, polypath_phase_startprivsep
,st
);
836 add_hook(PHASE_SHUTDOWN
, polypath_phase_shutdown
, st
);
837 add_hook(PHASE_CHILDPERSIST
,polypath_phase_childpersist
,st
);
839 return new_closure(&cc
->cl
);
842 #endif /* CONFIG_IPV6 */
844 void polypath_module(dict_t
*dict
)
847 add_closure(dict
,"polypath",polypath_apply
);
848 #endif /* CONFIG_IPV6 */