1d45fb8db7232f6abad11d1845408e3d50074d6f
5 * (c) 2012 Straylight/Edgeware
8 /*----- Licensing notice --------------------------------------------------*
10 * This file is part of Yet Another Ident Daemon (YAID).
12 * YAID is free software; you can redistribute it and/or modify
13 * it under the terms of the GNU General Public License as published by
14 * the Free Software Foundation; either version 2 of the License, or
15 * (at your option) any later version.
17 * YAID is distributed in the hope that it will be useful,
18 * but WITHOUT ANY WARRANTY; without even the implied warranty of
19 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
20 * GNU General Public License for more details.
22 * You should have received a copy of the GNU General Public License
23 * along with YAID; if not, write to the Free Software Foundation,
24 * Inc., 59 Temple Place - Suite 330, Boston, MA 02111-1307, USA.
27 /*----- Header files ------------------------------------------------------*/
31 /*----- Data structures ---------------------------------------------------*/
33 /* A write buffer is the gadget which keeps track of our output and writes
34 * portions of it out as and when connections are ready for it.
38 size_t o
; /* Offset of remaining data */
39 size_t n
; /* Length of remaining data */
40 sel_file wr
; /* Write selector */
41 void (*func
)(int /*err*/, void *); /* Function to call on completion */
42 void *p
; /* Context for `func' */
43 unsigned char buf
[WRBUFSZ
]; /* Output buffer */
46 /* Structure for a listening socket. There's one of these for each address
47 * family we're looking after.
50 const struct addrops
*ao
; /* Address family operations */
51 sel_file f
; /* Watch for incoming connections */
54 /* The main structure for a client. */
56 int fd
; /* The connection to the client */
57 selbuf b
; /* Accumulate lines of input */
58 struct query q
; /* The clients query and our reply */
59 struct sel_timer t
; /* Timeout for idle or doomed conn */
60 struct listen
*l
; /* Back to the listener (and ops) */
61 struct writebuf wb
; /* Write buffer for our reply */
62 struct proxy
*px
; /* Proxy if conn goes via NAT */
65 /* A proxy connection. */
67 int fd
; /* Connection; -1 if in progress */
68 struct client
*c
; /* Back to the client */
69 conn cn
; /* Nonblocking connection */
70 selbuf b
; /* Accumulate the response line */
71 struct writebuf wb
; /* Write buffer for query */
72 char nat
[ADDRLEN
]; /* Server address, as text */
75 /*----- Static variables --------------------------------------------------*/
77 static sel_state sel
; /* I/O multiplexer state */
79 static const struct policy default_policy
= POLICY_INIT(A_NAME
);
80 static policy_v policy
= DA_INIT
; /* Vector of global policy rules */
81 static fwatch polfw
; /* Watch policy file for changes */
83 static unsigned char tokenbuf
[4096]; /* Random-ish data for tokens */
84 static size_t tokenptr
= sizeof(tokenbuf
); /* Current read position */
85 static int randfd
; /* File descriptor for random data */
87 /*----- Ident protocol parsing --------------------------------------------*/
89 /* Advance *PP over whitespace characters. */
90 static void skipws(const char **pp
)
91 { while (isspace((unsigned char )**pp
)) (*pp
)++; }
93 /* Copy a token of no more than N bytes starting at *PP into Q, advancing *PP
96 static int idtoken(const char **pp
, char *q
, size_t n
)
103 if (*p
== ':' || *p
<= 32 || *p
>= 127) break;
113 /* Read an unsigned decimal number from *PP, and store it in *II. Check that
114 * it's between MIN and MAX, and advance *PP over it. Return zero for
115 * success, or nonzero if something goes wrong.
117 static int unum(const char **pp
, unsigned *ii
, unsigned min
, unsigned max
)
124 if (!isdigit((unsigned char)**pp
)) return (-1);
125 e
= errno
; errno
= 0;
126 i
= strtoul(*pp
, &q
, 10);
127 if (errno
) return (-1);
130 if (i
< min
|| i
> max
) return (-1);
135 /*----- Asynchronous writing ----------------------------------------------*/
137 /* Callback for actually writing stuff from a `writebuf'. */
138 static void write_out(int fd
, unsigned mode
, void *p
)
141 struct writebuf
*wb
= p
;
143 /* Try to write something. */
144 if ((n
= write(fd
, wb
->buf
+ wb
->o
, wb
->n
)) < 0) {
145 if (errno
== EAGAIN
|| errno
== EWOULDBLOCK
) return;
148 wb
->func(errno
, wb
->p
);
153 /* If there's nothing left then restore the buffer to its empty state. */
161 /* Queue N bytes starting at P to be written. */
162 static int queue_write(struct writebuf
*wb
, const void *p
, size_t n
)
164 /* Maybe there's nothing to actually do. */
167 /* Make sure it'll fit. */
168 if (wb
->n
- wb
->o
+ n
> WRBUFSZ
) return (-1);
170 /* If there's anything there already, then make sure it's at the start of
171 * the available space.
174 memmove(wb
->buf
, wb
->buf
+ wb
->o
, wb
->n
);
178 /* If there's nothing currently there, then we're not requesting write
179 * notifications, so set that up, and force an initial wake-up.
182 sel_addfile(&wb
->wr
);
186 /* Copy the new material over. */
187 memcpy(wb
->buf
+ wb
->n
, p
, n
);
194 /* Release resources allocated to WB. */
195 static void free_writebuf(struct writebuf
*wb
)
196 { if (wb
->n
) sel_rmfile(&wb
->wr
); }
198 /* Initialize a writebuf in *WB, writing to file descriptor FD. On
199 * completion, call FUNC, passing it P and an error indicator: either 0 for
200 * success or an `errno' value on failure.
202 static void init_writebuf(struct writebuf
*wb
,
203 int fd
, void (*func
)(int, void *), void *p
)
205 sel_initfile(&sel
, &wb
->wr
, fd
, SEL_WRITE
, write_out
, wb
);
211 /*----- General utilities -------------------------------------------------*/
213 /* Format and log MSG somewhere sensible, at the syslog(3) priority PRIO.
214 * Prefix it with a description of the query Q, if non-null.
216 void logmsg(const struct query
*q
, int prio
, const char *msg
, ...)
223 dputsock(&d
, q
->ao
, &q
->s
[L
]);
224 dstr_puts(&d
, " <-> ");
225 dputsock(&d
, q
->ao
, &q
->s
[R
]);
228 dstr_vputf(&d
, msg
, &ap
);
230 fprintf(stderr
, "yaid: %s\n", d
.buf
);
234 /* Fix up a socket FD so that it won't bite us. Returns zero on success, or
237 static int fix_up_socket(int fd
, const char *what
)
241 if (fdflags(fd
, O_NONBLOCK
, O_NONBLOCK
, 0, 0)) {
242 logmsg(0, LOG_ERR
, "failed to set %s connection nonblocking: %s",
243 what
, strerror(errno
));
247 if (setsockopt(fd
, SOL_SOCKET
, SO_OOBINLINE
, &yes
, sizeof(yes
))) {
249 "failed to disable `out-of-band' data on %s connection: %s",
250 what
, strerror(errno
));
257 /*----- Client output functions -------------------------------------------*/
259 static void disconnect_client(struct client
*c
);
261 /* Notification that output has been written. If successful, re-enable the
262 * input buffer and prepare for another query.
264 static void done_client_write(int err
, void *p
)
266 struct client
*c
= p
;
269 selbuf_enable(&c
->b
);
271 logmsg(&c
->q
, LOG_ERR
, "failed to send reply: %s", strerror(err
));
272 disconnect_client(c
);
276 /* Format the message FMT and queue it to be sent to the client. Client
277 * input will be disabled until the write completes.
279 static void write_to_client(struct client
*c
, const char *fmt
, ...)
286 n
= vsnprintf(buf
, sizeof(buf
), fmt
, ap
);
288 logmsg(&c
->q
, LOG_ERR
, "failed to format output: %s", strerror(errno
));
289 disconnect_client(c
);
291 } else if (n
> sizeof(buf
)) {
292 logmsg(&c
->q
, LOG_ERR
, "output too long for client send buffer");
293 disconnect_client(c
);
297 selbuf_disable(&c
->b
);
298 if (queue_write(&c
->wb
, buf
, n
)) {
299 logmsg(&c
->q
, LOG_ERR
, "write buffer overflow");
300 disconnect_client(c
);
304 /* Format a reply to the client, with the form LPORT:RPORT:TY:TOK0[:TOK1].
305 * Typically, TY will be `ERROR' or `USERID'. In the former case, TOK0 will
306 * be the error token and TOK1 will be null; in the latter case, TOK0 will be
307 * the operating system and TOK1 the user name.
309 static void reply(struct client
*c
, const char *ty
,
310 const char *tok0
, const char *tok1
)
312 write_to_client(c
, "%u,%u:%s:%s%s%s\r\n",
313 c
->q
.s
[L
].port
, c
->q
.s
[R
].port
, ty
,
314 tok0
, tok1 ?
":" : "", tok1 ? tok1
: "");
317 /* Mapping from error codes to their protocol tokens. */
318 const char *const errtok
[] = {
319 #define DEFTOK(err, tok) tok,
324 /* Report an error with code ERR to the client. */
325 static void reply_error(struct client
*c
, unsigned err
)
327 assert(err
< E_LIMIT
);
328 reply(c
, "ERROR", errtok
[err
], 0);
331 /*----- NAT proxy functions -----------------------------------------------*/
333 /* Cancel the proxy operation PX, closing the connection and releasing
334 * resources. This is used for both normal and unexpected closures.
336 static void cancel_proxy(struct proxy
*px
)
342 selbuf_destroy(&px
->b
);
343 free_writebuf(&px
->wb
);
345 selbuf_enable(&px
->c
->b
);
350 /* Notification that a line (presumably a reply) has been received from the
351 * server. We should check it, log it, and propagate the answer back.
352 * Whatever happens, this proxy operation is now complete.
354 static void proxy_line(char *line
, size_t sz
, void *p
)
356 struct proxy
*px
= p
;
358 const char *q
= line
;
361 /* Trim trailing space. */
362 while (sz
&& isspace((unsigned char)line
[sz
- 1])) sz
--;
364 /* Parse the port numbers. These should match the request. */
365 if (unum(&q
, &lp
, 1, 65535)) goto syntax
;
366 skipws(&q
); if (*q
!= ',') goto syntax
; q
++;
367 if (unum(&q
, &rp
, 1, 65535)) goto syntax
;
368 skipws(&q
); if (*q
!= ':') goto syntax
; q
++;
369 if (lp
!= px
->c
->q
.u
.nat
.port
|| rp
!= px
->c
->q
.s
[R
].port
) goto syntax
;
371 /* Find out what kind of reply this is. */
372 if (idtoken(&q
, buf
, sizeof(buf
))) goto syntax
;
373 skipws(&q
); if (*q
!= ':') goto syntax
; q
++;
375 if (strcmp(buf
, "ERROR") == 0) {
377 /* Report the error without interpreting it. It might be meaningful to
381 logmsg(&px
->c
->q
, LOG_ERR
, "proxy error from %s: %s", px
->nat
, q
);
382 reply(px
->c
, "ERROR", q
, 0);
384 } else if (strcmp(buf
, "USERID") == 0) {
386 /* Parse out the operating system and user name, and pass them on. */
387 if (idtoken(&q
, buf
, sizeof(buf
))) goto syntax
;
388 skipws(&q
); if (*q
!= ':') goto syntax
; q
++;
390 logmsg(&px
->c
->q
, LOG_ERR
, "user `%s'; proxy = %s, os = %s",
392 reply(px
->c
, "USERID", buf
, q
);
399 /* We didn't understand the message from the client. */
400 logmsg(&px
->c
->q
, LOG_ERR
, "failed to parse response from %s", px
->nat
);
401 reply_error(px
->c
, E_UNKNOWN
);
403 /* All finished, no matter what. */
407 /* Notification that we have written the query to the server. Await a
408 * response if successful.
410 static void done_proxy_write(int err
, void *p
)
412 struct proxy
*px
= p
;
415 logmsg(&px
->c
->q
, LOG_ERR
, "failed to proxy query to %s: %s",
416 px
->nat
, strerror(errno
));
417 reply_error(px
->c
, E_UNKNOWN
);
421 selbuf_enable(&px
->b
);
424 /* Notification that the connection to the server is either established or
425 * failed. In the former case, queue the right query.
427 static void proxy_connected(int fd
, void *p
)
429 struct proxy
*px
= p
;
433 /* If the connection failed then report the problem and give up. */
435 logmsg(&px
->c
->q
, LOG_ERR
,
436 "failed to make %s proxy connection to %s: %s",
437 px
->c
->l
->ao
->name
, px
->nat
, strerror(errno
));
438 reply_error(px
->c
, E_UNKNOWN
);
443 /* We're now ready to go, so set things up. */
445 selbuf_init(&px
->b
, &sel
, fd
, proxy_line
, px
);
446 selbuf_setsize(&px
->b
, 1024);
447 selbuf_disable(&px
->b
);
448 init_writebuf(&px
->wb
, fd
, done_proxy_write
, px
);
450 /* Write the query. This buffer is large enough because we've already
451 * range-checked the remote the port number and the local one came from the
452 * kernel, which we trust not to do anything stupid.
454 n
= sprintf(buf
, "%u,%u\r\n", px
->c
->q
.u
.nat
.port
, px
->c
->q
.s
[R
].port
);
455 queue_write(&px
->wb
, buf
, n
);
458 /* Proxy the query through to a client machine for which we're providing NAT
461 static void proxy_query(struct client
*c
)
464 struct sockaddr_storage ss
;
469 /* Allocate the context structure for the NAT. */
470 px
= xmalloc(sizeof(*px
));
472 /* We'll use the client host's address in lots of log messages, so we may
473 * as well format it once and use it over and over.
475 inet_ntop(c
->q
.ao
->af
, &c
->q
.u
.nat
.addr
, px
->nat
, sizeof(px
->nat
));
477 /* Create the socket for the connection. */
478 if ((fd
= socket(c
->q
.ao
->af
, SOCK_STREAM
, 0)) < 0) {
479 logmsg(&c
->q
, LOG_ERR
, "failed to make %s socket for proxy: %s",
480 c
->l
->ao
->name
, strerror(errno
));
483 if (fix_up_socket(fd
, "proxy")) goto err_1
;
485 /* Set up the connection to the client host. The connection interface is a
486 * bit broken: if the connection completes immediately, then the callback
487 * function is called synchronously, and that might decide to shut
488 * everything down. So we must have fully initialized our context before
489 * calling `conn_init', and mustn't touch it again afterwards -- since the
490 * block may have been freed.
494 c
->l
->ao
->socket_to_sockaddr(&s
, &ss
, &ssz
);
495 selbuf_disable(&c
->b
);
496 c
->px
= px
; px
->c
= c
;
498 if (conn_init(&px
->cn
, &sel
, fd
, (struct sockaddr
*)&ss
, ssz
,
499 proxy_connected
, px
)) {
500 logmsg(&c
->q
, LOG_ERR
, "failed to make %s proxy connection to %s: %s",
501 c
->l
->ao
->name
, px
->nat
, strerror(errno
));
505 /* All ready to go. */
508 /* Tidy up after various kinds of failures. */
510 selbuf_enable(&c
->b
);
515 reply_error(c
, E_UNKNOWN
);
518 /*----- Client connection functions ---------------------------------------*/
520 /* Disconnect a client, freeing up any associated resources. */
521 static void disconnect_client(struct client
*c
)
524 selbuf_destroy(&c
->b
);
526 free_writebuf(&c
->wb
);
527 if (c
->px
) cancel_proxy(c
->px
);
531 /* Time out a client because it's been idle for too long. */
532 static void timeout_client(struct timeval
*tv
, void *p
)
534 struct client
*c
= p
;
535 logmsg(&c
->q
, LOG_NOTICE
, "timing out idle or stuck client");
536 sel_addtimer(&sel
, &c
->t
, tv
, timeout_client
, 0);
537 disconnect_client(c
);
540 /* Reset the client idle timer, as a result of activity. Set EXISTP if
541 * there is an existing timer which needs to be removed.
543 static void reset_client_timer(struct client
*c
, int existp
)
547 gettimeofday(&tv
, 0);
549 if (existp
) sel_rmtimer(&c
->t
);
550 sel_addtimer(&sel
, &c
->t
, &tv
, timeout_client
, c
);
553 /* Write a pseudorandom token into the buffer at P, which must have space for
554 * at least TOKENSZ bytes.
556 #define TOKENRANDSZ 8
557 #define TOKENSZ ((4*TOKENRANDSZ + 5)/3)
558 static void user_token(char *p
)
563 static const char tokmap
[64] =
564 "ABCDEFGHIJKLMNOPQRSTUVWXYZabcdefghijklmnopqrstuvwxyz0123456789.-";
566 /* If there's not enough pseudorandom stuff lying around, then read more
569 if (tokenptr
+ TOKENRANDSZ
>= sizeof(tokenbuf
)) {
570 if (read(randfd
, tokenbuf
, sizeof(tokenbuf
)) < sizeof(tokenbuf
))
571 die(1, "unexpected short read or error from `/dev/urandom'");
575 /* Now encode the bytes using a slightly tweaked base-64 encoding. Read
576 * bytes into the accumulator and write out characters while there's
579 for (i
= 0; i
< TOKENRANDSZ
; i
++) {
580 a
= (a
<< 8) | tokenbuf
[tokenptr
++]; b
+= 8;
583 *p
++ = tokmap
[(a
>> b
) & 0x3f];
587 /* If there's anything left in the accumulator then flush it out. */
589 *p
++ = tokmap
[(a
<< (6 - b
)) & 0x3f];
591 /* Null-terminate the token. */
595 /* Notification that a line has been received from the client. Parse it,
596 * find out about the connection it's referring to, apply the relevant
597 * policy rules, and produce a response. This is where almost everything
598 * interesting happens.
600 static void client_line(char *line
, size_t len
, void *p
)
602 struct client
*c
= p
;
604 struct passwd
*pw
= 0;
605 const struct policy
*pol
;
607 struct policy upol
= POLICY_INIT(A_LIMIT
);
608 struct policy_file pf
;
612 /* If the connection has closed, then tidy stuff away. */
613 c
->q
.s
[L
].port
= c
->q
.s
[R
].port
= 0;
615 disconnect_client(c
);
619 /* Client activity, so update the timer. */
620 reset_client_timer(c
, 1);
622 /* See if the policy file has changed since we last looked. If so, try to
623 * read the new version.
625 if (fwatch_update(&polfw
, "yaid.policy")) {
626 logmsg(0, LOG_INFO
, "reload master policy file `%s'", "yaid.policy");
627 load_policy_file("yaid.policy", &policy
);
630 /* Read the local and remote port numbers into the query structure. */
632 if (unum(&q
, &c
->q
.s
[L
].port
, 1, 65535)) goto bad
;
633 skipws(&q
); if (*q
!= ',') goto bad
; q
++;
634 if (unum(&q
, &c
->q
.s
[R
].port
, 1, 65535)) goto bad
;
635 skipws(&q
); if (*q
) goto bad
;
637 /* Identify the connection. Act on the result. */
642 /* We found a user. Track down the user's password entry, because
643 * we'll want that later. Most of the processing for this case is
646 if ((pw
= getpwuid(c
->q
.u
.uid
)) == 0) {
647 logmsg(&c
->q
, LOG_ERR
, "no passwd entry for user %d", c
->q
.u
.uid
);
648 reply_error(c
, E_NOUSER
);
654 /* We've acted as a NAT for this connection. Proxy the query through
655 * to the actal client host.
661 /* We failed to identify the connection for some reason. We should
662 * already have logged an error, so there's not much to do here.
664 reply_error(c
, c
->q
.u
.error
);
668 /* Something happened that we don't understand. */
672 /* Search the table of policy rules to find a match. */
673 for (i
= 0; i
< DA_LEN(&policy
); i
++) {
674 pol
= &DA(&policy
)[i
];
675 if (!match_policy(pol
, &c
->q
)) continue;
677 /* If this is something simple, then apply the resulting policy rule. */
678 if (pol
->act
.act
!= A_USER
) goto match
;
680 /* The global policy has decided to let the user have a say, so we must
681 * parse the user file.
684 dstr_putf(&d
, "%s/.yaid.policy", pw
->pw_dir
);
685 if (open_policy_file(&pf
, d
.buf
, "user policy file", &c
->q
))
687 while (!read_policy_file(&pf
)) {
689 /* Give up after 100 lines. If the user's policy is that complicated,
690 * something's gone very wrong. Or there's too much commentary or
694 logmsg(&c
->q
, LOG_ERR
, "%s:%d: user policy file too long",
699 /* If this isn't a match, go around for the next rule. */
700 if (!match_policy(&pf
.p
, &c
->q
)) continue;
702 /* Check that the user is allowed to request this action. If not, see
703 * if there's a more acceptable action later on.
705 if (!(pol
->act
.u
.user
& (1 << pf
.p
.act
.act
))) {
706 logmsg(&c
->q
, LOG_ERR
,
707 "%s:%d: user action forbidden by global policy",
712 /* We've found a match, so grab it, close the file, and say we're
715 upol
= pf
.p
; pol
= &upol
;
717 close_policy_file(&pf
);
721 close_policy_file(&pf
);
725 /* No match: apply the built-in default policy. */
726 pol
= &default_policy
;
729 switch (pol
->act
.act
) {
732 /* Report the actual user's name. */
733 logmsg(&c
->q
, LOG_INFO
, "user `%s' (%d)", pw
->pw_name
, c
->q
.u
.uid
);
734 reply(c
, "USERID", "UNIX", pw
->pw_name
);
738 /* Report an arbitrary token which we can look up in our log file. */
740 logmsg(&c
->q
, LOG_INFO
, "user `%s' (%d); token = %s",
741 pw
->pw_name
, c
->q
.u
.uid
, buf
);
742 reply(c
, "USERID", "OTHER", buf
);
746 /* Deny that there's anyone there at all. */
747 logmsg(&c
->q
, LOG_INFO
, "user `%s' (%d); denying",
748 pw
->pw_name
, c
->q
.u
.uid
);
752 /* Report the user as being hidden. */
753 logmsg(&c
->q
, LOG_INFO
, "user `%s' (%d); hiding",
754 pw
->pw_name
, c
->q
.u
.uid
);
755 reply_error(c
, E_HIDDEN
);
759 /* Tell an egregious lie about who the user is. */
760 logmsg(&c
->q
, LOG_INFO
, "user `%s' (%d); lie = `%s'",
761 pw
->pw_name
, c
->q
.u
.uid
, pol
->act
.u
.lie
);
762 reply(c
, "USERID", "UNIX", pol
->act
.u
.lie
);
766 /* Something has gone very wrong. */
775 logmsg(&c
->q
, LOG_ERR
, "failed to parse query from client");
776 disconnect_client(c
);
779 /* Notification that a new client has connected. Prepare to read a query. */
780 static void accept_client(int fd
, unsigned mode
, void *p
)
782 struct listen
*l
= p
;
784 struct sockaddr_storage ssr
, ssl
;
785 size_t ssz
= sizeof(ssr
);
788 /* Accept the new connection. */
789 if ((sk
= accept(fd
, (struct sockaddr
*)&ssr
, &ssz
)) < 0) {
790 if (errno
!= EAGAIN
&& errno
== EWOULDBLOCK
) {
791 logmsg(0, LOG_ERR
, "failed to accept incoming %s connection: %s",
792 l
->ao
->name
, strerror(errno
));
796 if (fix_up_socket(sk
, "incoming client")) { close(sk
); return; }
798 /* Build a client block and fill it in. */
799 c
= xmalloc(sizeof(*c
));
803 /* Collect the local and remote addresses. */
804 l
->ao
->sockaddr_to_addr(&ssr
, &c
->q
.s
[R
].addr
);
806 if (getsockname(sk
, (struct sockaddr
*)&ssl
, &ssz
)) {
808 "failed to read local address for incoming %s connection: %s",
809 l
->ao
->name
, strerror(errno
));
814 l
->ao
->sockaddr_to_addr(&ssl
, &c
->q
.s
[L
].addr
);
815 c
->q
.s
[L
].port
= c
->q
.s
[R
].port
= 0;
817 /* Set stuff up for reading the query and sending responses. */
818 selbuf_init(&c
->b
, &sel
, sk
, client_line
, c
);
819 selbuf_setsize(&c
->b
, 1024);
820 reset_client_timer(c
, 0);
823 init_writebuf(&c
->wb
, sk
, done_client_write
, c
);
826 /*----- Main code ---------------------------------------------------------*/
828 /* Set up a listening socket for the address family described by AO,
831 static int make_listening_socket(const struct addrops
*ao
, int port
)
836 struct sockaddr_storage ss
;
840 /* Make the socket. */
841 if ((fd
= socket(ao
->af
, SOCK_STREAM
, 0)) < 0) {
842 if (errno
== EAFNOSUPPORT
) return (-1);
843 die(1, "failed to create %s listening socket: %s",
844 ao
->name
, strerror(errno
));
847 /* Build the appropriate local address. */
850 ao
->socket_to_sockaddr(&s
, &ss
, &ssz
);
852 /* Perform any initialization specific to the address type. */
853 if (ao
->init_listen_socket(fd
)) {
854 die(1, "failed to initialize %s listening socket: %s",
855 ao
->name
, strerror(errno
));
858 /* Bind to the address. */
859 setsockopt(fd
, SOL_SOCKET
, SO_REUSEADDR
, &yes
, sizeof(yes
));
860 if (bind(fd
, (struct sockaddr
*)&ss
, ssz
)) {
861 die(1, "failed to bind %s listening socket: %s",
862 ao
->name
, strerror(errno
));
865 /* Avoid unpleasant race conditions. */
866 if (fdflags(fd
, O_NONBLOCK
, O_NONBLOCK
, 0, 0)) {
867 die(1, "failed to set %s listening socket nonblocking: %s",
868 ao
->name
, strerror(errno
));
871 /* Prepare to listen. */
873 die(1, "failed to listen for %s: %s", ao
->name
, strerror(errno
));
875 /* Make a record of all of this. */
876 l
= xmalloc(sizeof(*l
));
878 sel_initfile(&sel
, &l
->f
, fd
, SEL_READ
, accept_client
, l
);
885 int main(int argc
, char *argv
[])
888 const struct addrops
*ao
;
893 fwatch_init(&polfw
, "yaid.policy");
895 if (load_policy_file("yaid.policy", &policy
))
898 for (i
= 0; i
< DA_LEN(&policy
); i
++)
899 print_policy(&DA(&policy
)[i
]);
902 if ((randfd
= open("/dev/urandom", O_RDONLY
)) < 0) {
903 die(1, "failed to open `/dev/urandom' for reading: %s",
908 for (ao
= addroptab
; ao
->name
; ao
++)
909 if (!make_listening_socket(ao
, port
)) any
= 1;
911 die(1, "no IP protocols supported");
914 if (sel_select(&sel
)) die(1, "select failed: %s", strerror(errno
));
919 /*----- That's all, folks -------------------------------------------------*/