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[dragonfly.git] / usr.sbin / inetd / inetd.c
blobb746840046627d980901899f2df3e184db59a191
1 /*
2 * Copyright (c) 1983, 1991, 1993, 1994
3 * The Regents of the University of California. All rights reserved.
4 *
5 * Redistribution and use in source and binary forms, with or without
6 * modification, are permitted provided that the following conditions
7 * are met:
8 * 1. Redistributions of source code must retain the above copyright
9 * notice, this list of conditions and the following disclaimer.
10 * 2. Redistributions in binary form must reproduce the above copyright
11 * notice, this list of conditions and the following disclaimer in the
12 * documentation and/or other materials provided with the distribution.
13 * 3. All advertising materials mentioning features or use of this software
14 * must display the following acknowledgement:
15 * This product includes software developed by the University of
16 * California, Berkeley and its contributors.
17 * 4. Neither the name of the University nor the names of its contributors
18 * may be used to endorse or promote products derived from this software
19 * without specific prior written permission.
20 *
21 * THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND
22 * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
23 * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
24 * ARE DISCLAIMED. IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE
25 * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
26 * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
27 * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
28 * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
29 * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
30 * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
31 * SUCH DAMAGE.
32 *
33 * @(#) Copyright (c) 1983, 1991, 1993, 1994 The Regents of the University of California. All rights reserved.
34 * @(#)from: inetd.c 8.4 (Berkeley) 4/13/94
35 * $FreeBSD: src/usr.sbin/inetd/inetd.c,v 1.80.2.11 2003/04/05 13:39:18 dwmalone Exp $
36 * $DragonFly: src/usr.sbin/inetd/inetd.c,v 1.11 2008/05/23 23:40:59 swildner Exp $
37 */
38
39 /*
40 * Inetd - Internet super-server
41 *
42 * This program invokes all internet services as needed. Connection-oriented
43 * services are invoked each time a connection is made, by creating a process.
44 * This process is passed the connection as file descriptor 0 and is expected
45 * to do a getpeername to find out the source host and port.
46 *
47 * Datagram oriented services are invoked when a datagram
48 * arrives; a process is created and passed a pending message
49 * on file descriptor 0. Datagram servers may either connect
50 * to their peer, freeing up the original socket for inetd
51 * to receive further messages on, or ``take over the socket'',
52 * processing all arriving datagrams and, eventually, timing
53 * out. The first type of server is said to be ``multi-threaded'';
54 * the second type of server ``single-threaded''.
55 *
56 * Inetd uses a configuration file which is read at startup
57 * and, possibly, at some later time in response to a hangup signal.
58 * The configuration file is ``free format'' with fields given in the
59 * order shown below. Continuation lines for an entry must begin with
60 * a space or tab. All fields must be present in each entry.
61 *
62 * service name must be in /etc/services
63 * or name a tcpmux service
64 * or specify a unix domain socket
65 * socket type stream/dgram/raw/rdm/seqpacket
66 * protocol tcp[4][6][/faith,ttcp], udp[4][6], unix
67 * wait/nowait single-threaded/multi-threaded
68 * user user to run daemon as
69 * server program full path name
70 * server program arguments maximum of MAXARGS (20)
71 *
72 * TCP services without official port numbers are handled with the
73 * RFC1078-based tcpmux internal service. Tcpmux listens on port 1 for
74 * requests. When a connection is made from a foreign host, the service
75 * requested is passed to tcpmux, which looks it up in the servtab list
76 * and returns the proper entry for the service. Tcpmux returns a
77 * negative reply if the service doesn't exist, otherwise the invoked
78 * server is expected to return the positive reply if the service type in
79 * inetd.conf file has the prefix "tcpmux/". If the service type has the
80 * prefix "tcpmux/+", tcpmux will return the positive reply for the
81 * process; this is for compatibility with older server code, and also
82 * allows you to invoke programs that use stdin/stdout without putting any
83 * special server code in them. Services that use tcpmux are "nowait"
84 * because they do not have a well-known port and hence cannot listen
85 * for new requests.
86 *
87 * For RPC services
88 * service name/version must be in /etc/rpc
89 * socket type stream/dgram/raw/rdm/seqpacket
90 * protocol rpc/tcp, rpc/udp
91 * wait/nowait single-threaded/multi-threaded
92 * user user to run daemon as
93 * server program full path name
94 * server program arguments maximum of MAXARGS
95 *
96 * Comment lines are indicated by a `#' in column 1.
97 *
98 * #ifdef IPSEC
99 * Comment lines that start with "#@" denote IPsec policy string, as described
100 * in ipsec_set_policy(3). This will affect all the following items in
101 * inetd.conf(8). To reset the policy, just use "#@" line. By default,
102 * there's no IPsec policy.
103 * #endif
104 */
105 #include <sys/param.h>
106 #include <sys/ioctl.h>
107 #include <sys/wait.h>
108 #include <sys/time.h>
109 #include <sys/resource.h>
110 #include <sys/stat.h>
111 #include <sys/un.h>
112
113 #include <netinet/in.h>
114 #include <netinet/tcp.h>
115 #include <arpa/inet.h>
116 #include <rpc/rpc.h>
117 #include <rpc/pmap_clnt.h>
118
119 #include <errno.h>
120 #include <err.h>
121 #include <fcntl.h>
122 #include <grp.h>
123 #include <netdb.h>
124 #include <pwd.h>
125 #include <signal.h>
126 #include <stdio.h>
127 #include <stdlib.h>
128 #include <string.h>
129 #include <syslog.h>
130 #include <tcpd.h>
131 #include <unistd.h>
132 #include <libutil.h>
133 #include <sysexits.h>
134 #include <ctype.h>
135
136 #include "inetd.h"
137 #include "pathnames.h"
138
139 #ifdef IPSEC
140 #include <netinet6/ipsec.h>
141 #ifndef IPSEC_POLICY_IPSEC /* no ipsec support on old ipsec */
142 #undef IPSEC
143 #endif
144 #endif
145
146 /* wrapper for KAME-special getnameinfo() */
147 #ifndef NI_WITHSCOPEID
148 #define NI_WITHSCOPEID 0
149 #endif
150
151 #ifndef LIBWRAP_ALLOW_FACILITY
152 # define LIBWRAP_ALLOW_FACILITY LOG_AUTH
153 #endif
154 #ifndef LIBWRAP_ALLOW_SEVERITY
155 # define LIBWRAP_ALLOW_SEVERITY LOG_INFO
156 #endif
157 #ifndef LIBWRAP_DENY_FACILITY
158 # define LIBWRAP_DENY_FACILITY LOG_AUTH
159 #endif
160 #ifndef LIBWRAP_DENY_SEVERITY
161 # define LIBWRAP_DENY_SEVERITY LOG_WARNING
162 #endif
163
164 #define ISWRAP(sep) \
165 ( ((wrap_ex && !(sep)->se_bi) || (wrap_bi && (sep)->se_bi)) \
166 && (sep->se_family == AF_INET || sep->se_family == AF_INET6) \
167 && ( ((sep)->se_accept && (sep)->se_socktype == SOCK_STREAM) \
168 || (sep)->se_socktype == SOCK_DGRAM))
169
170 #ifdef LOGIN_CAP
171 #include <login_cap.h>
172
173 /* see init.c */
174 #define RESOURCE_RC "daemon"
175
176 #endif
177
178 #ifndef MAXCHILD
179 #define MAXCHILD -1 /* maximum number of this service
180 < 0 = no limit */
181 #endif
182
183 #ifndef MAXCPM
184 #define MAXCPM -1 /* rate limit invocations from a
185 single remote address,
186 < 0 = no limit */
187 #endif
188
189 #ifndef MAXPERIP
190 #define MAXPERIP -1 /* maximum number of this service
191 from a single remote address,
192 < 0 = no limit */
193 #endif
194
195 #ifndef TOOMANY
196 #define TOOMANY 256 /* don't start more than TOOMANY */
197 #endif
198 #define CNT_INTVL 60 /* servers in CNT_INTVL sec. */
199 #define RETRYTIME (60*10) /* retry after bind or server fail */
200 #define MAX_MAXCHLD 32767 /* max allowable max children */
201
202 #define SIGBLOCK (sigmask(SIGCHLD)|sigmask(SIGHUP)|sigmask(SIGALRM))
203
204 void close_sep(struct servtab *);
205 void flag_signal(int);
206 void flag_config(int);
207 void config(void);
208 int cpmip(const struct servtab *, int);
209 void endconfig(void);
210 struct servtab *enter(struct servtab *);
211 void freeconfig(struct servtab *);
212 struct servtab *getconfigent(void);
213 int matchservent(const char *, const char *, const char *);
214 char *nextline(FILE *);
215 void addchild(struct servtab *, int);
216 void flag_reapchild(int);
217 void reapchild(void);
218 void enable(struct servtab *);
219 void disable(struct servtab *);
220 void flag_retry(int);
221 void retry(void);
222 int setconfig(void);
223 void setup(struct servtab *);
224 #ifdef IPSEC
225 void ipsecsetup(struct servtab *);
226 #endif
227 void unregisterrpc(struct servtab *sep);
228 static struct conninfo *search_conn(struct servtab *sep, int ctrl);
229 static int room_conn(struct servtab *sep, struct conninfo *conn);
230 static void addchild_conn(struct conninfo *conn, pid_t pid);
231 static void reapchild_conn(pid_t pid);
232 static void free_conn(struct conninfo *conn);
233 static void resize_conn(struct servtab *sep, int maxperip);
234 static void free_connlist(struct servtab *sep);
235 static void free_proc(struct procinfo *);
236 static struct procinfo *search_proc(pid_t pid, int add);
237 static int hashval(char *p, int len);
238
239 int allow_severity;
240 int deny_severity;
241 int wrap_ex = 0;
242 int wrap_bi = 0;
243 int debug = 0;
244 int dolog = 0;
245 int maxsock; /* highest-numbered descriptor */
246 fd_set allsock;
247 int options;
248 int timingout;
249 int toomany = TOOMANY;
250 int maxchild = MAXCHILD;
251 int maxcpm = MAXCPM;
252 int maxperip = MAXPERIP;
253 struct servent *sp;
254 struct rpcent *rpc;
255 char *hostname = NULL;
256 struct sockaddr_in *bind_sa4;
257 int no_v4bind = 1;
258 #ifdef INET6
259 struct sockaddr_in6 *bind_sa6;
260 int no_v6bind = 1;
261 #endif
262 int signalpipe[2];
263 #ifdef SANITY_CHECK
264 int nsock;
265 #endif
266 uid_t euid;
267 gid_t egid;
268 mode_t mask;
269
270 struct servtab *servtab;
271
272 extern struct biltin biltins[];
273
274 #define NUMINT (sizeof(intab) / sizeof(struct inent))
275 const char *CONFIG = _PATH_INETDCONF;
276 const char *pid_file = _PATH_INETDPID;
277
278 static LIST_HEAD(, procinfo) proctable[PERIPSIZE];
279
280 int
281 getvalue(const char *arg, int *value, const char *whine)
282 {
283 int tmp;
284 char *p;
285
286 tmp = strtol(arg, &p, 0);
287 if (tmp < 0 || *p) {
288 syslog(LOG_ERR, whine, arg);
289 return 1; /* failure */
290 }
291 *value = tmp;
292 return 0; /* success */
293 }
294
295 static sa_family_t
296 whichaf(struct request_info *req)
297 {
298 struct sockaddr *sa;
299
300 sa = (struct sockaddr *)req->client->sin;
301 if (sa == NULL)
302 return AF_UNSPEC;
303 if (sa->sa_family == AF_INET6 &&
304 IN6_IS_ADDR_V4MAPPED(&((struct sockaddr_in6 *)sa)->sin6_addr))
305 return AF_INET;
306 return sa->sa_family;
307 }
308
309 int
310 main(int argc, char **argv)
311 {
312 struct servtab *sep;
313 struct passwd *pwd;
314 struct group *grp;
315 struct sigaction sa, saalrm, sachld, sahup, sapipe;
316 int ch, dofork;
317 pid_t pid;
318 char buf[50];
319 #ifdef LOGIN_CAP
320 login_cap_t *lc = NULL;
321 #endif
322 struct request_info req;
323 int denied;
324 char *service = NULL;
325 union {
326 struct sockaddr peer_un;
327 struct sockaddr_in peer_un4;
328 struct sockaddr_in6 peer_un6;
329 struct sockaddr_storage peer_max;
330 } p_un;
331 #define peer p_un.peer_un
332 #define peer4 p_un.peer_un4
333 #define peer6 p_un.peer_un6
334 #define peermax p_un.peer_max
335 int i;
336 struct addrinfo hints, *res;
337 const char *servname;
338 int error;
339 struct conninfo *conn;
340
341 openlog("inetd", LOG_PID | LOG_NOWAIT | LOG_PERROR, LOG_DAEMON);
342
343 while ((ch = getopt(argc, argv, "dlwWR:a:c:C:p:s:")) != -1)
344 switch(ch) {
345 case 'd':
346 debug = 1;
347 options |= SO_DEBUG;
348 break;
349 case 'l':
350 dolog = 1;
351 break;
352 case 'R':
353 getvalue(optarg, &toomany,
354 "-R %s: bad value for service invocation rate");
355 break;
356 case 'c':
357 getvalue(optarg, &maxchild,
358 "-c %s: bad value for maximum children");
359 break;
360 case 'C':
361 getvalue(optarg, &maxcpm,
362 "-C %s: bad value for maximum children/minute");
363 break;
364 case 'a':
365 hostname = optarg;
366 break;
367 case 'p':
368 pid_file = optarg;
369 break;
370 case 's':
371 getvalue(optarg, &maxperip,
372 "-s %s: bad value for maximum children per source address");
373 break;
374 case 'w':
375 wrap_ex++;
376 break;
377 case 'W':
378 wrap_bi++;
379 break;
380 case '?':
381 default:
382 syslog(LOG_ERR,
383 "usage: inetd [-dlwW] [-a address] [-R rate]"
384 " [-c maximum] [-C rate]"
385 " [-p pidfile] [conf-file]");
386 exit(EX_USAGE);
387 }
388 /*
389 * Initialize Bind Addrs.
390 * When hostname is NULL, wild card bind addrs are obtained from
391 * getaddrinfo(). But getaddrinfo() requires at least one of
392 * hostname or servname is non NULL.
393 * So when hostname is NULL, set dummy value to servname.
394 */
395 servname = (hostname == NULL) ? "discard" /* dummy */ : NULL;
396
397 bzero(&hints, sizeof(struct addrinfo));
398 hints.ai_flags = AI_PASSIVE;
399 hints.ai_family = AF_UNSPEC;
400 error = getaddrinfo(hostname, servname, &hints, &res);
401 if (error != 0) {
402 syslog(LOG_ERR, "-a %s: %s", hostname, gai_strerror(error));
403 if (error == EAI_SYSTEM)
404 syslog(LOG_ERR, "%s", strerror(errno));
405 exit(EX_USAGE);
406 }
407 do {
408 if (res->ai_addr == NULL) {
409 syslog(LOG_ERR, "-a %s: getaddrinfo failed", hostname);
410 exit(EX_USAGE);
411 }
412 switch (res->ai_addr->sa_family) {
413 case AF_INET:
414 if (no_v4bind == 0)
415 continue;
416 bind_sa4 = (struct sockaddr_in *)res->ai_addr;
417 /* init port num in case servname is dummy */
418 bind_sa4->sin_port = 0;
419 no_v4bind = 0;
420 continue;
421 #ifdef INET6
422 case AF_INET6:
423 if (no_v6bind == 0)
424 continue;
425 bind_sa6 = (struct sockaddr_in6 *)res->ai_addr;
426 /* init port num in case servname is dummy */
427 bind_sa6->sin6_port = 0;
428 no_v6bind = 0;
429 continue;
430 #endif
431 }
432 if (no_v4bind == 0
433 #ifdef INET6
434 && no_v6bind == 0
435 #endif
436 )
437 break;
438 } while ((res = res->ai_next) != NULL);
439 if (no_v4bind != 0
440 #ifdef INET6
441 && no_v6bind != 0
442 #endif
443 ) {
444 syslog(LOG_ERR, "-a %s: unknown address family", hostname);
445 exit(EX_USAGE);
446 }
447
448 euid = geteuid();
449 egid = getegid();
450 umask(mask = umask(0777));
451
452 argc -= optind;
453 argv += optind;
454
455 if (argc > 0)
456 CONFIG = argv[0];
457 if (debug == 0) {
458 FILE *fp;
459 if (daemon(0, 0) < 0) {
460 syslog(LOG_WARNING, "daemon(0,0) failed: %m");
461 }
462 /* From now on we don't want syslog messages going to stderr. */
463 closelog();
464 openlog("inetd", LOG_PID | LOG_NOWAIT, LOG_DAEMON);
465 /*
466 * In case somebody has started inetd manually, we need to
467 * clear the logname, so that old servers run as root do not
468 * get the user's logname..
469 */
470 if (setlogin("") < 0) {
471 syslog(LOG_WARNING, "cannot clear logname: %m");
472 /* no big deal if it fails.. */
473 }
474 pid = getpid();
475 fp = fopen(pid_file, "w");
476 if (fp) {
477 fprintf(fp, "%ld\n", (long)pid);
478 fclose(fp);
479 } else {
480 syslog(LOG_WARNING, "%s: %m", pid_file);
481 }
482 }
483 for (i = 0; i < PERIPSIZE; ++i)
484 LIST_INIT(&proctable[i]);
485 sa.sa_flags = 0;
486 sigemptyset(&sa.sa_mask);
487 sigaddset(&sa.sa_mask, SIGALRM);
488 sigaddset(&sa.sa_mask, SIGCHLD);
489 sigaddset(&sa.sa_mask, SIGHUP);
490 sa.sa_handler = flag_retry;
491 sigaction(SIGALRM, &sa, &saalrm);
492 config();
493 sa.sa_handler = flag_config;
494 sigaction(SIGHUP, &sa, &sahup);
495 sa.sa_handler = flag_reapchild;
496 sigaction(SIGCHLD, &sa, &sachld);
497 sa.sa_handler = SIG_IGN;
498 sigaction(SIGPIPE, &sa, &sapipe);
499
500 {
501 /* space for daemons to overwrite environment for ps */
502 #define DUMMYSIZE 100
503 char dummy[DUMMYSIZE];
504
505 memset(dummy, 'x', DUMMYSIZE - 1);
506 dummy[DUMMYSIZE - 1] = '\0';
507 if (setenv("inetd_dummy", dummy, 1) == -1)
508 syslog(LOG_WARNING, "setenv: cannot set inetd_dummy=%s: %m", dummy);
509
510 }
511
512 if (pipe(signalpipe) != 0) {
513 syslog(LOG_ERR, "pipe: %m");
514 exit(EX_OSERR);
515 }
516 if (fcntl(signalpipe[0], F_SETFD, FD_CLOEXEC) < 0 ||
517 fcntl(signalpipe[1], F_SETFD, FD_CLOEXEC) < 0) {
518 syslog(LOG_ERR, "signalpipe: fcntl (F_SETFD, FD_CLOEXEC): %m");
519 exit(EX_OSERR);
520 }
521 FD_SET(signalpipe[0], &allsock);
522 #ifdef SANITY_CHECK
523 nsock++;
524 #endif
525 if (signalpipe[0] > maxsock)
526 maxsock = signalpipe[0];
527 if (signalpipe[1] > maxsock)
528 maxsock = signalpipe[1];
529
530 for (;;) {
531 int n, ctrl;
532 fd_set readable;
533
534 #ifdef SANITY_CHECK
535 if (nsock == 0) {
536 syslog(LOG_ERR, "%s: nsock=0", __func__);
537 exit(EX_SOFTWARE);
538 }
539 #endif
540 readable = allsock;
541 if ((n = select(maxsock + 1, &readable, (fd_set *)0,
542 (fd_set *)0, (struct timeval *)0)) <= 0) {
543 if (n < 0 && errno != EINTR) {
544 syslog(LOG_WARNING, "select: %m");
545 sleep(1);
546 }
547 continue;
548 }
549 /* handle any queued signal flags */
550 if (FD_ISSET(signalpipe[0], &readable)) {
551 int nsig;
552 if (ioctl(signalpipe[0], FIONREAD, &nsig) != 0) {
553 syslog(LOG_ERR, "ioctl: %m");
554 exit(EX_OSERR);
555 }
556 while (--nsig >= 0) {
557 char c;
558 if (read(signalpipe[0], &c, 1) != 1) {
559 syslog(LOG_ERR, "read: %m");
560 exit(EX_OSERR);
561 }
562 if (debug)
563 warnx("handling signal flag %c", c);
564 switch(c) {
565 case 'A': /* sigalrm */
566 retry();
567 break;
568 case 'C': /* sigchld */
569 reapchild();
570 break;
571 case 'H': /* sighup */
572 config();
573 break;
574 }
575 }
576 }
577 for (sep = servtab; n && sep; sep = sep->se_next)
578 if (sep->se_fd != -1 && FD_ISSET(sep->se_fd, &readable)) {
579 n--;
580 if (debug)
581 warnx("someone wants %s", sep->se_service);
582 dofork = !sep->se_bi || sep->se_bi->bi_fork || ISWRAP(sep);
583 conn = NULL;
584 if (sep->se_accept && sep->se_socktype == SOCK_STREAM) {
585 i = 1;
586 if (ioctl(sep->se_fd, FIONBIO, &i) < 0)
587 syslog(LOG_ERR, "ioctl (FIONBIO, 1): %m");
588 ctrl = accept(sep->se_fd, (struct sockaddr *)0,
589 (socklen_t *)0);
590 if (debug)
591 warnx("accept, ctrl %d", ctrl);
592 if (ctrl < 0) {
593 if (errno != EINTR)
594 syslog(LOG_WARNING,
595 "accept (for %s): %m",
596 sep->se_service);
597 if (sep->se_accept &&
598 sep->se_socktype == SOCK_STREAM)
599 close(ctrl);
600 continue;
601 }
602 i = 0;
603 if (ioctl(sep->se_fd, FIONBIO, &i) < 0)
604 syslog(LOG_ERR, "ioctl1(FIONBIO, 0): %m");
605 if (ioctl(ctrl, FIONBIO, &i) < 0)
606 syslog(LOG_ERR, "ioctl2(FIONBIO, 0): %m");
607 if (cpmip(sep, ctrl) < 0) {
608 close(ctrl);
609 continue;
610 }
611 if (dofork &&
612 (conn = search_conn(sep, ctrl)) != NULL &&
613 !room_conn(sep, conn)) {
614 close(ctrl);
615 continue;
616 }
617 } else
618 ctrl = sep->se_fd;
619 if (dolog && !ISWRAP(sep)) {
620 char pname[INET6_ADDRSTRLEN] = "unknown";
621 socklen_t sl;
622 sl = sizeof peermax;
623 if (getpeername(ctrl, (struct sockaddr *)
624 &peermax, &sl)) {
625 sl = sizeof peermax;
626 if (recvfrom(ctrl, buf, sizeof(buf),
627 MSG_PEEK,
628 (struct sockaddr *)&peermax,
629 &sl) >= 0) {
630 getnameinfo((struct sockaddr *)&peermax,
631 peer.sa_len,
632 pname, sizeof(pname),
633 NULL, 0,
634 NI_NUMERICHOST|
635 NI_WITHSCOPEID);
636 }
637 } else {
638 getnameinfo((struct sockaddr *)&peermax,
639 peer.sa_len,
640 pname, sizeof(pname),
641 NULL, 0,
642 NI_NUMERICHOST|
643 NI_WITHSCOPEID);
644 }
645 syslog(LOG_INFO,"%s from %s", sep->se_service, pname);
646 }
647 sigblock(SIGBLOCK);
648 pid = 0;
649 /*
650 * Fork for all external services, builtins which need to
651 * fork and anything we're wrapping (as wrapping might
652 * block or use hosts_options(5) twist).
653 */
654 if (dofork) {
655 if (sep->se_count++ == 0)
656 gettimeofday(&sep->se_time, (struct timezone *)NULL);
657 else if (toomany > 0 && sep->se_count >= toomany) {
658 struct timeval now;
659
660 gettimeofday(&now, (struct timezone *)NULL);
661 if (now.tv_sec - sep->se_time.tv_sec >
662 CNT_INTVL) {
663 sep->se_time = now;
664 sep->se_count = 1;
665 } else {
666 syslog(LOG_ERR,
667 "%s/%s server failing (looping), service terminated",
668 sep->se_service, sep->se_proto);
669 if (sep->se_accept &&
670 sep->se_socktype == SOCK_STREAM)
671 close(ctrl);
672 close_sep(sep);
673 free_conn(conn);
674 sigsetmask(0L);
675 if (!timingout) {
676 timingout = 1;
677 alarm(RETRYTIME);
678 }
679 continue;
680 }
681 }
682 pid = fork();
683 }
684 if (pid < 0) {
685 syslog(LOG_ERR, "fork: %m");
686 if (sep->se_accept &&
687 sep->se_socktype == SOCK_STREAM)
688 close(ctrl);
689 free_conn(conn);
690 sigsetmask(0L);
691 sleep(1);
692 continue;
693 }
694 if (pid) {
695 addchild_conn(conn, pid);
696 addchild(sep, pid);
697 }
698 sigsetmask(0L);
699 if (pid == 0) {
700 if (dofork) {
701 sigaction(SIGALRM, &saalrm, (struct sigaction *)0);
702 sigaction(SIGCHLD, &sachld, (struct sigaction *)0);
703 sigaction(SIGHUP, &sahup, (struct sigaction *)0);
704 /* SIGPIPE reset before exec */
705 }
706 /*
707 * Call tcpmux to find the real service to exec.
708 */
709 if (sep->se_bi &&
710 sep->se_bi->bi_fn == (bi_fn_t *) tcpmux) {
711 sep = tcpmux(ctrl);
712 if (sep == NULL) {
713 close(ctrl);
714 _exit(0);
715 }
716 }
717 if (ISWRAP(sep)) {
718 inetd_setproctitle("wrapping", ctrl);
719 service = sep->se_server_name ?
720 sep->se_server_name : sep->se_service;
721 request_init(&req, RQ_DAEMON, service, RQ_FILE, ctrl, NULL);
722 fromhost(&req);
723 deny_severity = LIBWRAP_DENY_FACILITY|LIBWRAP_DENY_SEVERITY;
724 allow_severity = LIBWRAP_ALLOW_FACILITY|LIBWRAP_ALLOW_SEVERITY;
725 denied = !hosts_access(&req);
726 if (denied) {
727 syslog(deny_severity,
728 "refused connection from %.500s, service %s (%s%s)",
729 eval_client(&req), service, sep->se_proto,
730 (whichaf(&req) == AF_INET6) ? "6" : "");
731 if (sep->se_socktype != SOCK_STREAM)
732 recv(ctrl, buf, sizeof (buf), 0);
733 if (dofork) {
734 sleep(1);
735 _exit(0);
736 }
737 }
738 if (dolog) {
739 syslog(allow_severity,
740 "connection from %.500s, service %s (%s%s)",
741 eval_client(&req), service, sep->se_proto,
742 (whichaf(&req) == AF_INET6) ? "6" : "");
743 }
744 }
745 if (sep->se_bi) {
746 (*sep->se_bi->bi_fn)(ctrl, sep);
747 } else {
748 if (debug)
749 warnx("%d execl %s",
750 getpid(), sep->se_server);
751 /* Clear close-on-exec. */
752 if (fcntl(ctrl, F_SETFD, 0) < 0) {
753 syslog(LOG_ERR,
754 "%s/%s: fcntl (F_SETFD, 0): %m",
755 sep->se_service, sep->se_proto);
756 _exit(EX_OSERR);
757 }
758 if (ctrl != 0) {
759 dup2(ctrl, 0);
760 close(ctrl);
761 }
762 dup2(0, 1);
763 dup2(0, 2);
764 if ((pwd = getpwnam(sep->se_user)) == NULL) {
765 syslog(LOG_ERR,
766 "%s/%s: %s: no such user",
767 sep->se_service, sep->se_proto,
768 sep->se_user);
769 if (sep->se_socktype != SOCK_STREAM)
770 recv(0, buf, sizeof (buf), 0);
771 _exit(EX_NOUSER);
772 }
773 grp = NULL;
774 if ( sep->se_group != NULL
775 && (grp = getgrnam(sep->se_group)) == NULL
776 ) {
777 syslog(LOG_ERR,
778 "%s/%s: %s: no such group",
779 sep->se_service, sep->se_proto,
780 sep->se_group);
781 if (sep->se_socktype != SOCK_STREAM)
782 recv(0, buf, sizeof (buf), 0);
783 _exit(EX_NOUSER);
784 }
785 if (grp != NULL)
786 pwd->pw_gid = grp->gr_gid;
787 #ifdef LOGIN_CAP
788 if ((lc = login_getclass(sep->se_class)) == NULL) {
789 /* error syslogged by getclass */
790 syslog(LOG_ERR,
791 "%s/%s: %s: login class error",
792 sep->se_service, sep->se_proto,
793 sep->se_class);
794 if (sep->se_socktype != SOCK_STREAM)
795 recv(0, buf, sizeof (buf), 0);
796 _exit(EX_NOUSER);
797 }
798 #endif
799 if (setsid() < 0) {
800 syslog(LOG_ERR,
801 "%s: can't setsid(): %m",
802 sep->se_service);
803 /* _exit(EX_OSERR); not fatal yet */
804 }
805 #ifdef LOGIN_CAP
806 if (setusercontext(lc, pwd, pwd->pw_uid,
807 LOGIN_SETALL) != 0) {
808 syslog(LOG_ERR,
809 "%s: can't setusercontext(..%s..): %m",
810 sep->se_service, sep->se_user);
811 _exit(EX_OSERR);
812 }
813 login_close(lc);
814 #else
815 if (pwd->pw_uid) {
816 if (setlogin(sep->se_user) < 0) {
817 syslog(LOG_ERR,
818 "%s: can't setlogin(%s): %m",
819 sep->se_service, sep->se_user);
820 /* _exit(EX_OSERR); not yet */
821 }
822 if (setgid(pwd->pw_gid) < 0) {
823 syslog(LOG_ERR,
824 "%s: can't set gid %d: %m",
825 sep->se_service, pwd->pw_gid);
826 _exit(EX_OSERR);
827 }
828 initgroups(pwd->pw_name,
829 pwd->pw_gid);
830 if (setuid(pwd->pw_uid) < 0) {
831 syslog(LOG_ERR,
832 "%s: can't set uid %d: %m",
833 sep->se_service, pwd->pw_uid);
834 _exit(EX_OSERR);
835 }
836 }
837 #endif
838 sigaction(SIGPIPE, &sapipe,
839 (struct sigaction *)0);
840 execv(sep->se_server, sep->se_argv);
841 syslog(LOG_ERR,
842 "cannot execute %s: %m", sep->se_server);
843 if (sep->se_socktype != SOCK_STREAM)
844 recv(0, buf, sizeof (buf), 0);
845 }
846 if (dofork)
847 _exit(0);
848 }
849 if (sep->se_accept && sep->se_socktype == SOCK_STREAM)
850 close(ctrl);
851 }
852 }
853 }
854
855 /*
856 * Add a signal flag to the signal flag queue for later handling
857 */
858
859 void
860 flag_signal(int c)
861 {
862 char ch = c;
863
864 if (write(signalpipe[1], &ch, 1) != 1) {
865 syslog(LOG_ERR, "write: %m");
866 _exit(EX_OSERR);
867 }
868 }
869
870 /*
871 * Record a new child pid for this service. If we've reached the
872 * limit on children, then stop accepting incoming requests.
873 */
874
875 void
876 addchild(struct servtab *sep, pid_t pid)
877 {
878 if (sep->se_maxchild <= 0)
879 return;
880 #ifdef SANITY_CHECK
881 if (sep->se_numchild >= sep->se_maxchild) {
882 syslog(LOG_ERR, "%s: %d >= %d",
883 __func__, sep->se_numchild, sep->se_maxchild);
884 exit(EX_SOFTWARE);
885 }
886 #endif
887 sep->se_pids[sep->se_numchild++] = pid;
888 if (sep->se_numchild == sep->se_maxchild)
889 disable(sep);
890 }
891
892 /*
893 * Some child process has exited. See if it's on somebody's list.
894 */
895
896 void
897 flag_reapchild(int signo __unused)
898 {
899 flag_signal('C');
900 }
901
902 void
903 reapchild(void)
904 {
905 int k, status;
906 pid_t pid;
907 struct servtab *sep;
908
909 for (;;) {
910 pid = wait3(&status, WNOHANG, (struct rusage *)0);
911 if (pid <= 0)
912 break;
913 if (debug)
914 warnx("%d reaped, %s %u", pid,
915 WIFEXITED(status) ? "status" : "signal",
916 WIFEXITED(status) ? WEXITSTATUS(status)
917 : WTERMSIG(status));
918 for (sep = servtab; sep; sep = sep->se_next) {
919 for (k = 0; k < sep->se_numchild; k++)
920 if (sep->se_pids[k] == pid)
921 break;
922 if (k == sep->se_numchild)
923 continue;
924 if (sep->se_numchild == sep->se_maxchild)
925 enable(sep);
926 sep->se_pids[k] = sep->se_pids[--sep->se_numchild];
927 if (WIFSIGNALED(status) || WEXITSTATUS(status))
928 syslog(LOG_WARNING,
929 "%s[%d]: exited, %s %u",
930 sep->se_server, pid,
931 WIFEXITED(status) ? "status" : "signal",
932 WIFEXITED(status) ? WEXITSTATUS(status)
933 : WTERMSIG(status));
934 break;
935 }
936 reapchild_conn(pid);
937 }
938 }
939
940 void
941 flag_config(int signo __unused)
942 {
943 flag_signal('H');
944 }
945
946 void
947 config(void)
948 {
949 struct servtab *sep, *new, **sepp;
950 long omask;
951 #ifdef LOGIN_CAP
952 login_cap_t *lc = NULL;
953 #endif
954
955
956 if (!setconfig()) {
957 syslog(LOG_ERR, "%s: %m", CONFIG);
958 return;
959 }
960 for (sep = servtab; sep; sep = sep->se_next)
961 sep->se_checked = 0;
962 while ((new = getconfigent())) {
963 if (getpwnam(new->se_user) == NULL) {
964 syslog(LOG_ERR,
965 "%s/%s: no such user '%s', service ignored",
966 new->se_service, new->se_proto, new->se_user);
967 continue;
968 }
969 if (new->se_group && getgrnam(new->se_group) == NULL) {
970 syslog(LOG_ERR,
971 "%s/%s: no such group '%s', service ignored",
972 new->se_service, new->se_proto, new->se_group);
973 continue;
974 }
975 #ifdef LOGIN_CAP
976 if ((lc = login_getclass(new->se_class)) == NULL) {
977 /* error syslogged by getclass */
978 syslog(LOG_ERR,
979 "%s/%s: %s: login class error, service ignored",
980 new->se_service, new->se_proto, new->se_class);
981 continue;
982 }
983 login_close(lc);
984 #endif
985 for (sep = servtab; sep; sep = sep->se_next)
986 if (strcmp(sep->se_service, new->se_service) == 0 &&
987 strcmp(sep->se_proto, new->se_proto) == 0 &&
988 sep->se_socktype == new->se_socktype &&
989 sep->se_family == new->se_family)
990 break;
991 if (sep != 0) {
992 int i;
993
994 #define SWAP(a, b) { typeof(a) c = a; a = b; b = c; }
995 omask = sigblock(SIGBLOCK);
996 if (sep->se_nomapped != new->se_nomapped) {
997 sep->se_nomapped = new->se_nomapped;
998 sep->se_reset = 1;
999 }
1000 /* copy over outstanding child pids */
1001 if (sep->se_maxchild > 0 && new->se_maxchild > 0) {
1002 new->se_numchild = sep->se_numchild;
1003 if (new->se_numchild > new->se_maxchild)
1004 new->se_numchild = new->se_maxchild;
1005 memcpy(new->se_pids, sep->se_pids,
1006 new->se_numchild * sizeof(*new->se_pids));
1007 }
1008 SWAP(sep->se_pids, new->se_pids);
1009 sep->se_maxchild = new->se_maxchild;
1010 sep->se_numchild = new->se_numchild;
1011 sep->se_maxcpm = new->se_maxcpm;
1012 resize_conn(sep, new->se_maxperip);
1013 sep->se_maxperip = new->se_maxperip;
1014 sep->se_bi = new->se_bi;
1015 /* might need to turn on or off service now */
1016 if (sep->se_fd >= 0) {
1017 if (sep->se_maxchild > 0
1018 && sep->se_numchild == sep->se_maxchild) {
1019 if (FD_ISSET(sep->se_fd, &allsock))
1020 disable(sep);
1021 } else {
1022 if (!FD_ISSET(sep->se_fd, &allsock))
1023 enable(sep);
1024 }
1025 }
1026 sep->se_accept = new->se_accept;
1027 SWAP(sep->se_user, new->se_user);
1028 SWAP(sep->se_group, new->se_group);
1029 #ifdef LOGIN_CAP
1030 SWAP(sep->se_class, new->se_class);
1031 #endif
1032 SWAP(sep->se_server, new->se_server);
1033 SWAP(sep->se_server_name, new->se_server_name);
1034 for (i = 0; i < MAXARGV; i++)
1035 SWAP(sep->se_argv[i], new->se_argv[i]);
1036 #ifdef IPSEC
1037 SWAP(sep->se_policy, new->se_policy);
1038 ipsecsetup(sep);
1039 #endif
1040 sigsetmask(omask);
1041 freeconfig(new);
1042 if (debug)
1043 print_service("REDO", sep);
1044 } else {
1045 sep = enter(new);
1046 if (debug)
1047 print_service("ADD ", sep);
1048 }
1049 sep->se_checked = 1;
1050 if (ISMUX(sep)) {
1051 sep->se_fd = -1;
1052 continue;
1053 }
1054 switch (sep->se_family) {
1055 case AF_INET:
1056 if (no_v4bind != 0) {
1057 sep->se_fd = -1;
1058 continue;
1059 }
1060 break;
1061 #ifdef INET6
1062 case AF_INET6:
1063 if (no_v6bind != 0) {
1064 sep->se_fd = -1;
1065 continue;
1066 }
1067 break;
1068 #endif
1069 }
1070 if (!sep->se_rpc) {
1071 if (sep->se_family != AF_UNIX) {
1072 sp = getservbyname(sep->se_service, sep->se_proto);
1073 if (sp == 0) {
1074 syslog(LOG_ERR, "%s/%s: unknown service",
1075 sep->se_service, sep->se_proto);
1076 sep->se_checked = 0;
1077 continue;
1078 }
1079 }
1080 switch (sep->se_family) {
1081 case AF_INET:
1082 if (sp->s_port != sep->se_ctrladdr4.sin_port) {
1083 sep->se_ctrladdr4.sin_port =
1084 sp->s_port;
1085 sep->se_reset = 1;
1086 }
1087 break;
1088 #ifdef INET6
1089 case AF_INET6:
1090 if (sp->s_port !=
1091 sep->se_ctrladdr6.sin6_port) {
1092 sep->se_ctrladdr6.sin6_port =
1093 sp->s_port;
1094 sep->se_reset = 1;
1095 }
1096 break;
1097 #endif
1098 }
1099 if (sep->se_reset != 0 && sep->se_fd >= 0)
1100 close_sep(sep);
1101 } else {
1102 rpc = getrpcbyname(sep->se_service);
1103 if (rpc == 0) {
1104 syslog(LOG_ERR, "%s/%s unknown RPC service",
1105 sep->se_service, sep->se_proto);
1106 if (sep->se_fd != -1)
1107 close(sep->se_fd);
1108 sep->se_fd = -1;
1109 continue;
1110 }
1111 if (rpc->r_number != sep->se_rpc_prog) {
1112 if (sep->se_rpc_prog)
1113 unregisterrpc(sep);
1114 sep->se_rpc_prog = rpc->r_number;
1115 if (sep->se_fd != -1)
1116 close(sep->se_fd);
1117 sep->se_fd = -1;
1118 }
1119 }
1120 if (sep->se_fd == -1)
1121 setup(sep);
1122 }
1123 endconfig();
1124 /*
1125 * Purge anything not looked at above.
1126 */
1127 omask = sigblock(SIGBLOCK);
1128 sepp = &servtab;
1129 while ((sep = *sepp)) {
1130 if (sep->se_checked) {
1131 sepp = &sep->se_next;
1132 continue;
1133 }
1134 *sepp = sep->se_next;
1135 if (sep->se_fd >= 0)
1136 close_sep(sep);
1137 if (debug)
1138 print_service("FREE", sep);
1139 if (sep->se_rpc && sep->se_rpc_prog > 0)
1140 unregisterrpc(sep);
1141 freeconfig(sep);
1142 free(sep);
1143 }
1144 sigsetmask(omask);
1145 }
1146
1147 void
1148 unregisterrpc(struct servtab *sep)
1149 {
1150 u_int i;
1151 struct servtab *sepp;
1152 long omask;
1153
1154 omask = sigblock(SIGBLOCK);
1155 for (sepp = servtab; sepp; sepp = sepp->se_next) {
1156 if (sepp == sep)
1157 continue;
1158 if (sep->se_checked == 0 ||
1159 !sepp->se_rpc ||
1160 sep->se_rpc_prog != sepp->se_rpc_prog)
1161 continue;
1162 return;
1163 }
1164 if (debug)
1165 print_service("UNREG", sep);
1166 for (i = sep->se_rpc_lowvers; i <= sep->se_rpc_highvers; i++)
1167 pmap_unset(sep->se_rpc_prog, i);
1168 if (sep->se_fd != -1)
1169 close(sep->se_fd);
1170 sep->se_fd = -1;
1171 sigsetmask(omask);
1172 }
1173
1174 void
1175 flag_retry(int signo __unused)
1176 {
1177 flag_signal('A');
1178 }
1179
1180 void
1181 retry(void)
1182 {
1183 struct servtab *sep;
1184
1185 timingout = 0;
1186 for (sep = servtab; sep; sep = sep->se_next)
1187 if (sep->se_fd == -1 && !ISMUX(sep))
1188 setup(sep);
1189 }
1190
1191 void
1192 setup(struct servtab *sep)
1193 {
1194 int on = 1;
1195
1196 if ((sep->se_fd = socket(sep->se_family, sep->se_socktype, 0)) < 0) {
1197 if (debug)
1198 warn("socket failed on %s/%s",
1199 sep->se_service, sep->se_proto);
1200 syslog(LOG_ERR, "%s/%s: socket: %m",
1201 sep->se_service, sep->se_proto);
1202 return;
1203 }
1204 /* Set all listening sockets to close-on-exec. */
1205 if (fcntl(sep->se_fd, F_SETFD, FD_CLOEXEC) < 0) {
1206 syslog(LOG_ERR, "%s/%s: fcntl (F_SETFD, FD_CLOEXEC): %m",
1207 sep->se_service, sep->se_proto);
1208 close(sep->se_fd);
1209 return;
1210 }
1211 #define turnon(fd, opt) \
1212 setsockopt(fd, SOL_SOCKET, opt, (char *)&on, sizeof (on))
1213 if (strcmp(sep->se_proto, "tcp") == 0 && (options & SO_DEBUG) &&
1214 turnon(sep->se_fd, SO_DEBUG) < 0)
1215 syslog(LOG_ERR, "setsockopt (SO_DEBUG): %m");
1216 if (turnon(sep->se_fd, SO_REUSEADDR) < 0)
1217 syslog(LOG_ERR, "setsockopt (SO_REUSEADDR): %m");
1218 #ifdef SO_PRIVSTATE
1219 if (turnon(sep->se_fd, SO_PRIVSTATE) < 0)
1220 syslog(LOG_ERR, "setsockopt (SO_PRIVSTATE): %m");
1221 #endif
1222 /* tftpd opens a new connection then needs more infos */
1223 if ((sep->se_family == AF_INET6) &&
1224 (strcmp(sep->se_proto, "udp") == 0) &&
1225 (sep->se_accept == 0) &&
1226 (setsockopt(sep->se_fd, IPPROTO_IPV6, IPV6_PKTINFO,
1227 (char *)&on, sizeof (on)) < 0))
1228 syslog(LOG_ERR, "setsockopt (IPV6_RECVPKTINFO): %m");
1229 if (sep->se_family == AF_INET6) {
1230 int flag = sep->se_nomapped ? 1 : 0;
1231 if (setsockopt(sep->se_fd, IPPROTO_IPV6, IPV6_V6ONLY,
1232 (char *)&flag, sizeof (flag)) < 0)
1233 syslog(LOG_ERR, "setsockopt (IPV6_V6ONLY): %m");
1234 }
1235 #undef turnon
1236 if (sep->se_type == TTCP_TYPE)
1237 if (setsockopt(sep->se_fd, IPPROTO_TCP, TCP_NOPUSH,
1238 (char *)&on, sizeof (on)) < 0)
1239 syslog(LOG_ERR, "setsockopt (TCP_NOPUSH): %m");
1240 #ifdef IPV6_FAITH
1241 if (sep->se_type == FAITH_TYPE) {
1242 if (setsockopt(sep->se_fd, IPPROTO_IPV6, IPV6_FAITH, &on,
1243 sizeof(on)) < 0) {
1244 syslog(LOG_ERR, "setsockopt (IPV6_FAITH): %m");
1245 }
1246 }
1247 #endif
1248 #ifdef IPSEC
1249 ipsecsetup(sep);
1250 #endif
1251 if (sep->se_family == AF_UNIX) {
1252 unlink(sep->se_ctrladdr_un.sun_path);
1253 umask(0777); /* Make socket with conservative permissions */
1254 }
1255 if (bind(sep->se_fd, (struct sockaddr *)&sep->se_ctrladdr,
1256 sep->se_ctrladdr_size) < 0) {
1257 if (debug)
1258 warn("bind failed on %s/%s",
1259 sep->se_service, sep->se_proto);
1260 syslog(LOG_ERR, "%s/%s: bind: %m",
1261 sep->se_service, sep->se_proto);
1262 close(sep->se_fd);
1263 sep->se_fd = -1;
1264 if (!timingout) {
1265 timingout = 1;
1266 alarm(RETRYTIME);
1267 }
1268 if (sep->se_family == AF_UNIX)
1269 umask(mask);
1270 return;
1271 }
1272 if (sep->se_family == AF_UNIX) {
1273 /* Ick - fch{own,mod} don't work on Unix domain sockets */
1274 if (chown(sep->se_service, sep->se_sockuid, sep->se_sockgid) < 0)
1275 syslog(LOG_ERR, "chown socket: %m");
1276 if (chmod(sep->se_service, sep->se_sockmode) < 0)
1277 syslog(LOG_ERR, "chmod socket: %m");
1278 umask(mask);
1279 }
1280 if (sep->se_rpc) {
1281 u_int i;
1282 socklen_t len = sep->se_ctrladdr_size;
1283
1284 if (sep->se_family != AF_INET) {
1285 syslog(LOG_ERR,
1286 "%s/%s: unsupported address family for rpc",
1287 sep->se_service, sep->se_proto);
1288 close(sep->se_fd);
1289 sep->se_fd = -1;
1290 return;
1291 }
1292 if (getsockname(sep->se_fd,
1293 (struct sockaddr*)&sep->se_ctrladdr, &len) < 0){
1294 syslog(LOG_ERR, "%s/%s: getsockname: %m",
1295 sep->se_service, sep->se_proto);
1296 close(sep->se_fd);
1297 sep->se_fd = -1;
1298 return;
1299 }
1300 if (debug)
1301 print_service("REG ", sep);
1302 for (i = sep->se_rpc_lowvers; i <= sep->se_rpc_highvers; i++) {
1303 pmap_unset(sep->se_rpc_prog, i);
1304 pmap_set(sep->se_rpc_prog, i,
1305 (sep->se_socktype == SOCK_DGRAM)
1306 ? IPPROTO_UDP : IPPROTO_TCP,
1307 ntohs(sep->se_ctrladdr4.sin_port));
1308 }
1309 }
1310 if (sep->se_socktype == SOCK_STREAM)
1311 listen(sep->se_fd, 64);
1312 enable(sep);
1313 if (debug) {
1314 warnx("registered %s on %d",
1315 sep->se_server, sep->se_fd);
1316 }
1317 }
1318
1319 #ifdef IPSEC
1320 void
1321 ipsecsetup(struct servtab *sep)
1322 {
1323 char *buf;
1324 char *policy_in = NULL;
1325 char *policy_out = NULL;
1326 int level;
1327 int opt;
1328
1329 switch (sep->se_family) {
1330 case AF_INET:
1331 level = IPPROTO_IP;
1332 opt = IP_IPSEC_POLICY;
1333 break;
1334 #ifdef INET6
1335 case AF_INET6:
1336 level = IPPROTO_IPV6;
1337 opt = IPV6_IPSEC_POLICY;
1338 break;
1339 #endif
1340 default:
1341 return;
1342 }
1343
1344 if (!sep->se_policy || sep->se_policy[0] == '\0') {
1345 static char def_in[] = "in entrust", def_out[] = "out entrust";
1346 policy_in = def_in;
1347 policy_out = def_out;
1348 } else {
1349 if (!strncmp("in", sep->se_policy, 2))
1350 policy_in = sep->se_policy;
1351 else if (!strncmp("out", sep->se_policy, 3))
1352 policy_out = sep->se_policy;
1353 else {
1354 syslog(LOG_ERR, "invalid security policy \"%s\"",
1355 sep->se_policy);
1356 return;
1357 }
1358 }
1359
1360 if (policy_in != NULL) {
1361 buf = ipsec_set_policy(policy_in, strlen(policy_in));
1362 if (buf != NULL) {
1363 if (setsockopt(sep->se_fd, level, opt,
1364 buf, ipsec_get_policylen(buf)) < 0 &&
1365 debug != 0)
1366 warnx("%s/%s: ipsec initialization failed; %s",
1367 sep->se_service, sep->se_proto,
1368 policy_in);
1369 free(buf);
1370 } else
1371 syslog(LOG_ERR, "invalid security policy \"%s\"",
1372 policy_in);
1373 }
1374 if (policy_out != NULL) {
1375 buf = ipsec_set_policy(policy_out, strlen(policy_out));
1376 if (buf != NULL) {
1377 if (setsockopt(sep->se_fd, level, opt,
1378 buf, ipsec_get_policylen(buf)) < 0 &&
1379 debug != 0)
1380 warnx("%s/%s: ipsec initialization failed; %s",
1381 sep->se_service, sep->se_proto,
1382 policy_out);
1383 free(buf);
1384 } else
1385 syslog(LOG_ERR, "invalid security policy \"%s\"",
1386 policy_out);
1387 }
1388 }
1389 #endif
1390
1391 /*
1392 * Finish with a service and its socket.
1393 */
1394 void
1395 close_sep(struct servtab *sep)
1396 {
1397 if (sep->se_fd >= 0) {
1398 if (FD_ISSET(sep->se_fd, &allsock))
1399 disable(sep);
1400 close(sep->se_fd);
1401 sep->se_fd = -1;
1402 }
1403 sep->se_count = 0;
1404 sep->se_numchild = 0; /* forget about any existing children */
1405 }
1406
1407 int
1408 matchservent(const char *name1, const char *name2, const char *proto)
1409 {
1410 char **alias, *p;
1411 struct servent *se;
1412
1413 if (strcmp(proto, "unix") == 0) {
1414 if ((p = strrchr(name1, '/')) != NULL)
1415 name1 = p + 1;
1416 if ((p = strrchr(name2, '/')) != NULL)
1417 name2 = p + 1;
1418 }
1419 if (strcmp(name1, name2) == 0)
1420 return(1);
1421 if ((se = getservbyname(name1, proto)) != NULL) {
1422 if (strcmp(name2, se->s_name) == 0)
1423 return(1);
1424 for (alias = se->s_aliases; *alias; alias++)
1425 if (strcmp(name2, *alias) == 0)
1426 return(1);
1427 }
1428 return(0);
1429 }
1430
1431 struct servtab *
1432 enter(struct servtab *cp)
1433 {
1434 struct servtab *sep;
1435 long omask;
1436
1437 sep = (struct servtab *)malloc(sizeof (*sep));
1438 if (sep == (struct servtab *)0) {
1439 syslog(LOG_ERR, "malloc: %m");
1440 exit(EX_OSERR);
1441 }
1442 *sep = *cp;
1443 sep->se_fd = -1;
1444 omask = sigblock(SIGBLOCK);
1445 sep->se_next = servtab;
1446 servtab = sep;
1447 sigsetmask(omask);
1448 return (sep);
1449 }
1450
1451 void
1452 enable(struct servtab *sep)
1453 {
1454 if (debug)
1455 warnx(
1456 "enabling %s, fd %d", sep->se_service, sep->se_fd);
1457 #ifdef SANITY_CHECK
1458 if (sep->se_fd < 0) {
1459 syslog(LOG_ERR,
1460 "%s: %s: bad fd", __func__, sep->se_service);
1461 exit(EX_SOFTWARE);
1462 }
1463 if (ISMUX(sep)) {
1464 syslog(LOG_ERR,
1465 "%s: %s: is mux", __func__, sep->se_service);
1466 exit(EX_SOFTWARE);
1467 }
1468 if (FD_ISSET(sep->se_fd, &allsock)) {
1469 syslog(LOG_ERR,
1470 "%s: %s: not off", __func__, sep->se_service);
1471 exit(EX_SOFTWARE);
1472 }
1473 nsock++;
1474 #endif
1475 FD_SET(sep->se_fd, &allsock);
1476 if (sep->se_fd > maxsock)
1477 maxsock = sep->se_fd;
1478 }
1479
1480 void
1481 disable(struct servtab *sep)
1482 {
1483 if (debug)
1484 warnx(
1485 "disabling %s, fd %d", sep->se_service, sep->se_fd);
1486 #ifdef SANITY_CHECK
1487 if (sep->se_fd < 0) {
1488 syslog(LOG_ERR,
1489 "%s: %s: bad fd", __func__, sep->se_service);
1490 exit(EX_SOFTWARE);
1491 }
1492 if (ISMUX(sep)) {
1493 syslog(LOG_ERR,
1494 "%s: %s: is mux", __func__, sep->se_service);
1495 exit(EX_SOFTWARE);
1496 }
1497 if (!FD_ISSET(sep->se_fd, &allsock)) {
1498 syslog(LOG_ERR,
1499 "%s: %s: not on", __func__, sep->se_service);
1500 exit(EX_SOFTWARE);
1501 }
1502 if (nsock == 0) {
1503 syslog(LOG_ERR, "%s: nsock=0", __func__);
1504 exit(EX_SOFTWARE);
1505 }
1506 nsock--;
1507 #endif
1508 FD_CLR(sep->se_fd, &allsock);
1509 if (sep->se_fd == maxsock)
1510 maxsock--;
1511 }
1512
1513 FILE *fconfig = NULL;
1514 struct servtab serv;
1515 char line[LINE_MAX];
1516
1517 int
1518 setconfig(void)
1519 {
1520
1521 if (fconfig != NULL) {
1522 fseek(fconfig, 0L, SEEK_SET);
1523 return (1);
1524 }
1525 fconfig = fopen(CONFIG, "r");
1526 return (fconfig != NULL);
1527 }
1528
1529 void
1530 endconfig(void)
1531 {
1532 if (fconfig) {
1533 fclose(fconfig);
1534 fconfig = NULL;
1535 }
1536 }
1537
1538 struct servtab *
1539 getconfigent(void)
1540 {
1541 struct servtab *sep = &serv;
1542 int argc;
1543 char *cp, *arg, *s;
1544 char *versp;
1545 static char TCPMUX_TOKEN[] = "tcpmux/";
1546 #define MUX_LEN (sizeof(TCPMUX_TOKEN)-1)
1547 #ifdef IPSEC
1548 char *policy = NULL;
1549 #endif
1550 int v4bind = 0;
1551 #ifdef INET6
1552 int v6bind = 0;
1553 #endif
1554 int i;
1555
1556 more:
1557 while ((cp = nextline(fconfig)) != NULL) {
1558 #ifdef IPSEC
1559 /* lines starting with #@ is not a comment, but the policy */
1560 if (cp[0] == '#' && cp[1] == '@') {
1561 char *p;
1562 for (p = cp + 2; p && *p && isspace(*p); p++)
1563 ;
1564 if (*p == '\0') {
1565 if (policy)
1566 free(policy);
1567 policy = NULL;
1568 } else if (ipsec_get_policylen(p) >= 0) {
1569 if (policy)
1570 free(policy);
1571 policy = newstr(p);
1572 } else {
1573 syslog(LOG_ERR,
1574 "%s: invalid ipsec policy \"%s\"",
1575 CONFIG, p);
1576 exit(EX_CONFIG);
1577 }
1578 }
1579 #endif
1580 if (*cp == '#' || *cp == '\0')
1581 continue;
1582 break;
1583 }
1584 if (cp == NULL)
1585 return ((struct servtab *)0);
1586 /*
1587 * clear the static buffer, since some fields (se_ctrladdr,
1588 * for example) don't get initialized here.
1589 */
1590 memset(sep, 0, sizeof *sep);
1591 arg = skip(&cp);
1592 if (cp == NULL) {
1593 /* got an empty line containing just blanks/tabs. */
1594 goto more;
1595 }
1596 if (arg[0] == ':') { /* :user:group:perm: */
1597 char *user, *group, *perm;
1598 struct passwd *pw;
1599 struct group *gr;
1600 user = arg+1;
1601 if ((group = strchr(user, ':')) == NULL) {
1602 syslog(LOG_ERR, "no group after user '%s'", user);
1603 goto more;
1604 }
1605 *group++ = '\0';
1606 if ((perm = strchr(group, ':')) == NULL) {
1607 syslog(LOG_ERR, "no mode after group '%s'", group);
1608 goto more;
1609 }
1610 *perm++ = '\0';
1611 if ((pw = getpwnam(user)) == NULL) {
1612 syslog(LOG_ERR, "no such user '%s'", user);
1613 goto more;
1614 }
1615 sep->se_sockuid = pw->pw_uid;
1616 if ((gr = getgrnam(group)) == NULL) {
1617 syslog(LOG_ERR, "no such user '%s'", group);
1618 goto more;
1619 }
1620 sep->se_sockgid = gr->gr_gid;
1621 sep->se_sockmode = strtol(perm, &arg, 8);
1622 if (*arg != ':') {
1623 syslog(LOG_ERR, "bad mode '%s'", perm);
1624 goto more;
1625 }
1626 *arg++ = '\0';
1627 } else {
1628 sep->se_sockuid = euid;
1629 sep->se_sockgid = egid;
1630 sep->se_sockmode = 0200;
1631 }
1632 if (strncmp(arg, TCPMUX_TOKEN, MUX_LEN) == 0) {
1633 char *c = arg + MUX_LEN;
1634 if (*c == '+') {
1635 sep->se_type = MUXPLUS_TYPE;
1636 c++;
1637 } else
1638 sep->se_type = MUX_TYPE;
1639 sep->se_service = newstr(c);
1640 } else {
1641 sep->se_service = newstr(arg);
1642 sep->se_type = NORM_TYPE;
1643 }
1644 arg = sskip(&cp);
1645 if (strcmp(arg, "stream") == 0)
1646 sep->se_socktype = SOCK_STREAM;
1647 else if (strcmp(arg, "dgram") == 0)
1648 sep->se_socktype = SOCK_DGRAM;
1649 else if (strcmp(arg, "rdm") == 0)
1650 sep->se_socktype = SOCK_RDM;
1651 else if (strcmp(arg, "seqpacket") == 0)
1652 sep->se_socktype = SOCK_SEQPACKET;
1653 else if (strcmp(arg, "raw") == 0)
1654 sep->se_socktype = SOCK_RAW;
1655 else
1656 sep->se_socktype = -1;
1657
1658 arg = sskip(&cp);
1659 if (strncmp(arg, "tcp", 3) == 0) {
1660 sep->se_proto = newstr(strsep(&arg, "/"));
1661 if (arg != NULL) {
1662 if (strcmp(arg, "ttcp") == 0)
1663 sep->se_type = TTCP_TYPE;
1664 else if (strcmp(arg, "faith") == 0)
1665 sep->se_type = FAITH_TYPE;
1666 }
1667 } else {
1668 if (sep->se_type == NORM_TYPE &&
1669 strncmp(arg, "faith/", 6) == 0) {
1670 arg += 6;
1671 sep->se_type = FAITH_TYPE;
1672 }
1673 sep->se_proto = newstr(arg);
1674 }
1675 if (strncmp(sep->se_proto, "rpc/", 4) == 0) {
1676 if (no_v4bind != 0) {
1677 syslog(LOG_NOTICE, "IPv4 bind is ignored for %s",
1678 sep->se_service);
1679 freeconfig(sep);
1680 goto more;
1681 }
1682 memmove(sep->se_proto, sep->se_proto + 4,
1683 strlen(sep->se_proto) + 1 - 4);
1684 sep->se_rpc = 1;
1685 sep->se_rpc_prog = sep->se_rpc_lowvers =
1686 sep->se_rpc_lowvers = 0;
1687 memcpy(&sep->se_ctrladdr4, bind_sa4,
1688 sizeof(sep->se_ctrladdr4));
1689 if ((versp = strrchr(sep->se_service, '/'))) {
1690 *versp++ = '\0';
1691 switch (sscanf(versp, "%u-%u",
1692 &sep->se_rpc_lowvers,
1693 &sep->se_rpc_highvers)) {
1694 case 2:
1695 break;
1696 case 1:
1697 sep->se_rpc_highvers =
1698 sep->se_rpc_lowvers;
1699 break;
1700 default:
1701 syslog(LOG_ERR,
1702 "bad RPC version specifier; %s",
1703 sep->se_service);
1704 freeconfig(sep);
1705 goto more;
1706 }
1707 }
1708 else {
1709 sep->se_rpc_lowvers =
1710 sep->se_rpc_highvers = 1;
1711 }
1712 }
1713 sep->se_nomapped = 0;
1714 while (isdigit(sep->se_proto[strlen(sep->se_proto) - 1])) {
1715 #ifdef INET6
1716 if (sep->se_proto[strlen(sep->se_proto) - 1] == '6') {
1717 if (no_v6bind != 0) {
1718 syslog(LOG_NOTICE, "IPv6 bind is ignored for %s",
1719 sep->se_service);
1720 freeconfig(sep);
1721 goto more;
1722 }
1723 sep->se_proto[strlen(sep->se_proto) - 1] = '\0';
1724 v6bind = 1;
1725 continue;
1726 }
1727 #endif
1728 if (sep->se_proto[strlen(sep->se_proto) - 1] == '4') {
1729 sep->se_proto[strlen(sep->se_proto) - 1] = '\0';
1730 v4bind = 1;
1731 continue;
1732 }
1733 /* illegal version num */
1734 syslog(LOG_ERR, "bad IP version for %s", sep->se_proto);
1735 freeconfig(sep);
1736 goto more;
1737 }
1738 if (strcmp(sep->se_proto, "unix") == 0) {
1739 sep->se_family = AF_UNIX;
1740 } else
1741 #ifdef INET6
1742 if (v6bind != 0) {
1743 sep->se_family = AF_INET6;
1744 if (v4bind == 0 || no_v4bind != 0)
1745 sep->se_nomapped = 1;
1746 } else
1747 #endif
1748 { /* default to v4 bind if not v6 bind */
1749 if (no_v4bind != 0) {
1750 syslog(LOG_NOTICE, "IPv4 bind is ignored for %s",
1751 sep->se_service);
1752 freeconfig(sep);
1753 goto more;
1754 }
1755 sep->se_family = AF_INET;
1756 }
1757 /* init ctladdr */
1758 switch(sep->se_family) {
1759 case AF_INET:
1760 memcpy(&sep->se_ctrladdr4, bind_sa4,
1761 sizeof(sep->se_ctrladdr4));
1762 sep->se_ctrladdr_size = sizeof(sep->se_ctrladdr4);
1763 break;
1764 #ifdef INET6
1765 case AF_INET6:
1766 memcpy(&sep->se_ctrladdr6, bind_sa6,
1767 sizeof(sep->se_ctrladdr6));
1768 sep->se_ctrladdr_size = sizeof(sep->se_ctrladdr6);
1769 break;
1770 #endif
1771 case AF_UNIX:
1772 if (strlen(sep->se_service) >= sizeof(sep->se_ctrladdr_un.sun_path)) {
1773 syslog(LOG_ERR,
1774 "domain socket pathname too long for service %s",
1775 sep->se_service);
1776 goto more;
1777 }
1778 memset(&sep->se_ctrladdr, 0, sizeof(sep->se_ctrladdr));
1779 sep->se_ctrladdr_un.sun_family = sep->se_family;
1780 sep->se_ctrladdr_un.sun_len = strlen(sep->se_service);
1781 strcpy(sep->se_ctrladdr_un.sun_path, sep->se_service);
1782 sep->se_ctrladdr_size = SUN_LEN(&sep->se_ctrladdr_un);
1783 }
1784 arg = sskip(&cp);
1785 if (!strncmp(arg, "wait", 4))
1786 sep->se_accept = 0;
1787 else if (!strncmp(arg, "nowait", 6))
1788 sep->se_accept = 1;
1789 else {
1790 syslog(LOG_ERR,
1791 "%s: bad wait/nowait for service %s",
1792 CONFIG, sep->se_service);
1793 goto more;
1794 }
1795 sep->se_maxchild = -1;
1796 sep->se_maxcpm = -1;
1797 sep->se_maxperip = -1;
1798 if ((s = strchr(arg, '/')) != NULL) {
1799 char *eptr;
1800 u_long val;
1801
1802 val = strtoul(s + 1, &eptr, 10);
1803 if (eptr == s + 1 || val > MAX_MAXCHLD) {
1804 syslog(LOG_ERR,
1805 "%s: bad max-child for service %s",
1806 CONFIG, sep->se_service);
1807 goto more;
1808 }
1809 if (debug)
1810 if (!sep->se_accept && val != 1)
1811 warnx("maxchild=%lu for wait service %s"
1812 " not recommended", val, sep->se_service);
1813 sep->se_maxchild = val;
1814 if (*eptr == '/')
1815 sep->se_maxcpm = strtol(eptr + 1, &eptr, 10);
1816 if (*eptr == '/')
1817 sep->se_maxperip = strtol(eptr + 1, &eptr, 10);
1818 /*
1819 * explicitly do not check for \0 for future expansion /
1820 * backwards compatibility
1821 */
1822 }
1823 if (ISMUX(sep)) {
1824 /*
1825 * Silently enforce "nowait" mode for TCPMUX services
1826 * since they don't have an assigned port to listen on.
1827 */
1828 sep->se_accept = 1;
1829 if (strcmp(sep->se_proto, "tcp")) {
1830 syslog(LOG_ERR,
1831 "%s: bad protocol for tcpmux service %s",
1832 CONFIG, sep->se_service);
1833 goto more;
1834 }
1835 if (sep->se_socktype != SOCK_STREAM) {
1836 syslog(LOG_ERR,
1837 "%s: bad socket type for tcpmux service %s",
1838 CONFIG, sep->se_service);
1839 goto more;
1840 }
1841 }
1842 sep->se_user = newstr(sskip(&cp));
1843 #ifdef LOGIN_CAP
1844 if ((s = strrchr(sep->se_user, '/')) != NULL) {
1845 *s = '\0';
1846 sep->se_class = newstr(s + 1);
1847 } else
1848 sep->se_class = newstr(RESOURCE_RC);
1849 #endif
1850 if ((s = strrchr(sep->se_user, ':')) != NULL) {
1851 *s = '\0';
1852 sep->se_group = newstr(s + 1);
1853 } else
1854 sep->se_group = NULL;
1855 sep->se_server = newstr(sskip(&cp));
1856 if ((sep->se_server_name = strrchr(sep->se_server, '/')))
1857 sep->se_server_name++;
1858 if (strcmp(sep->se_server, "internal") == 0) {
1859 struct biltin *bi;
1860
1861 for (bi = biltins; bi->bi_service; bi++)
1862 if (bi->bi_socktype == sep->se_socktype &&
1863 matchservent(bi->bi_service, sep->se_service,
1864 sep->se_proto))
1865 break;
1866 if (bi->bi_service == 0) {
1867 syslog(LOG_ERR, "internal service %s unknown",
1868 sep->se_service);
1869 goto more;
1870 }
1871 sep->se_accept = 1; /* force accept mode for built-ins */
1872 sep->se_bi = bi;
1873 } else
1874 sep->se_bi = NULL;
1875 if (sep->se_maxperip < 0)
1876 sep->se_maxperip = maxperip;
1877 if (sep->se_maxcpm < 0)
1878 sep->se_maxcpm = maxcpm;
1879 if (sep->se_maxchild < 0) { /* apply default max-children */
1880 if (sep->se_bi && sep->se_bi->bi_maxchild >= 0)
1881 sep->se_maxchild = sep->se_bi->bi_maxchild;
1882 else if (sep->se_accept)
1883 sep->se_maxchild = maxchild > 0 ? maxchild : 0;
1884 else
1885 sep->se_maxchild = 1;
1886 }
1887 if (sep->se_maxchild > 0) {
1888 sep->se_pids = malloc(sep->se_maxchild * sizeof(*sep->se_pids));
1889 if (sep->se_pids == NULL) {
1890 syslog(LOG_ERR, "malloc: %m");
1891 exit(EX_OSERR);
1892 }
1893 }
1894 argc = 0;
1895 for (arg = skip(&cp); cp; arg = skip(&cp))
1896 if (argc < MAXARGV) {
1897 sep->se_argv[argc++] = newstr(arg);
1898 } else {
1899 syslog(LOG_ERR,
1900 "%s: too many arguments for service %s",
1901 CONFIG, sep->se_service);
1902 goto more;
1903 }
1904 while (argc <= MAXARGV)
1905 sep->se_argv[argc++] = NULL;
1906 for (i = 0; i < PERIPSIZE; ++i)
1907 LIST_INIT(&sep->se_conn[i]);
1908 #ifdef IPSEC
1909 sep->se_policy = policy ? newstr(policy) : NULL;
1910 #endif
1911 return (sep);
1912 }
1913
1914 void
1915 freeconfig(struct servtab *cp)
1916 {
1917 int i;
1918
1919 if (cp->se_service)
1920 free(cp->se_service);
1921 if (cp->se_proto)
1922 free(cp->se_proto);
1923 if (cp->se_user)
1924 free(cp->se_user);
1925 if (cp->se_group)
1926 free(cp->se_group);
1927 #ifdef LOGIN_CAP
1928 if (cp->se_class)
1929 free(cp->se_class);
1930 #endif
1931 if (cp->se_server)
1932 free(cp->se_server);
1933 if (cp->se_pids)
1934 free(cp->se_pids);
1935 for (i = 0; i < MAXARGV; i++)
1936 if (cp->se_argv[i])
1937 free(cp->se_argv[i]);
1938 free_connlist(cp);
1939 #ifdef IPSEC
1940 if (cp->se_policy)
1941 free(cp->se_policy);
1942 #endif
1943 }
1944
1945
1946 /*
1947 * Safe skip - if skip returns null, log a syntax error in the
1948 * configuration file and exit.
1949 */
1950 char *
1951 sskip(char **cpp)
1952 {
1953 char *cp;
1954
1955 cp = skip(cpp);
1956 if (cp == NULL) {
1957 syslog(LOG_ERR, "%s: syntax error", CONFIG);
1958 exit(EX_DATAERR);
1959 }
1960 return (cp);
1961 }
1962
1963 char *
1964 skip(char **cpp)
1965 {
1966 char *cp = *cpp;
1967 char *start;
1968 char quote = '\0';
1969
1970 again:
1971 while (*cp == ' ' || *cp == '\t')
1972 cp++;
1973 if (*cp == '\0') {
1974 int c;
1975
1976 c = getc(fconfig);
1977 ungetc(c, fconfig);
1978 if (c == ' ' || c == '\t')
1979 if ((cp = nextline(fconfig)))
1980 goto again;
1981 *cpp = (char *)0;
1982 return ((char *)0);
1983 }
1984 if (*cp == '"' || *cp == '\'')
1985 quote = *cp++;
1986 start = cp;
1987 if (quote)
1988 while (*cp && *cp != quote)
1989 cp++;
1990 else
1991 while (*cp && *cp != ' ' && *cp != '\t')
1992 cp++;
1993 if (*cp != '\0')
1994 *cp++ = '\0';
1995 *cpp = cp;
1996 return (start);
1997 }
1998
1999 char *
2000 nextline(FILE *fd)
2001 {
2002 char *cp;
2003
2004 if (fgets(line, sizeof (line), fd) == NULL)
2005 return ((char *)0);
2006 cp = strchr(line, '\n');
2007 if (cp)
2008 *cp = '\0';
2009 return (line);
2010 }
2011
2012 char *
2013 newstr(const char *cp)
2014 {
2015 char *cr;
2016
2017 if ((cr = strdup(cp != NULL ? cp : "")))
2018 return (cr);
2019 syslog(LOG_ERR, "strdup: %m");
2020 exit(EX_OSERR);
2021 }
2022
2023 void
2024 inetd_setproctitle(const char *a, int s)
2025 {
2026 socklen_t size;
2027 struct sockaddr_storage ss;
2028 char buf[80], pbuf[INET6_ADDRSTRLEN];
2029
2030 size = sizeof(ss);
2031 if (getpeername(s, (struct sockaddr *)&ss, &size) == 0) {
2032 getnameinfo((struct sockaddr *)&ss, size, pbuf, sizeof(pbuf),
2033 NULL, 0, NI_NUMERICHOST|NI_WITHSCOPEID);
2034 sprintf(buf, "%s [%s]", a, pbuf);
2035 } else
2036 sprintf(buf, "%s", a);
2037 setproctitle("%s", buf);
2038 }
2039
2040 int
2041 check_loop(const struct sockaddr *sa, const struct servtab *sep)
2042 {
2043 struct servtab *se2;
2044 char pname[INET6_ADDRSTRLEN];
2045
2046 for (se2 = servtab; se2; se2 = se2->se_next) {
2047 if (!se2->se_bi || se2->se_socktype != SOCK_DGRAM)
2048 continue;
2049
2050 switch (se2->se_family) {
2051 case AF_INET:
2052 if (((const struct sockaddr_in *)sa)->sin_port ==
2053 se2->se_ctrladdr4.sin_port)
2054 goto isloop;
2055 continue;
2056 #ifdef INET6
2057 case AF_INET6:
2058 if (((const struct sockaddr_in *)sa)->sin_port ==
2059 se2->se_ctrladdr4.sin_port)
2060 goto isloop;
2061 continue;
2062 #endif
2063 default:
2064 continue;
2065 }
2066 isloop:
2067 getnameinfo(sa, sa->sa_len, pname, sizeof(pname), NULL, 0,
2068 NI_NUMERICHOST|NI_WITHSCOPEID);
2069 syslog(LOG_WARNING, "%s/%s:%s/%s loop request REFUSED from %s",
2070 sep->se_service, sep->se_proto,
2071 se2->se_service, se2->se_proto,
2072 pname);
2073 return 1;
2074 }
2075 return 0;
2076 }
2077
2078 /*
2079 * print_service:
2080 * Dump relevant information to stderr
2081 */
2082 void
2083 print_service(const char *action, const struct servtab *sep)
2084 {
2085 fprintf(stderr,
2086 "%s: %s proto=%s accept=%d max=%d user=%s group=%s"
2087 #ifdef LOGIN_CAP
2088 "class=%s"
2089 #endif
2090 " builtin=%p server=%s"
2091 #ifdef IPSEC
2092 " policy=\"%s\""
2093 #endif
2094 "\n",
2095 action, sep->se_service, sep->se_proto,
2096 sep->se_accept, sep->se_maxchild, sep->se_user, sep->se_group,
2097 #ifdef LOGIN_CAP
2098 sep->se_class,
2099 #endif
2100 (void *) sep->se_bi, sep->se_server
2101 #ifdef IPSEC
2102 , (sep->se_policy ? sep->se_policy : "")
2103 #endif
2104 );
2105 }
2106
2107 #define CPMHSIZE 256
2108 #define CPMHMASK (CPMHSIZE-1)
2109 #define CHTGRAN 10
2110 #define CHTSIZE 6
2111
2112 typedef struct CTime {
2113 unsigned long ct_Ticks;
2114 int ct_Count;
2115 } CTime;
2116
2117 typedef struct CHash {
2118 union {
2119 struct in_addr c4_Addr;
2120 struct in6_addr c6_Addr;
2121 } cu_Addr;
2122 #define ch_Addr4 cu_Addr.c4_Addr
2123 #define ch_Addr6 cu_Addr.c6_Addr
2124 int ch_Family;
2125 time_t ch_LTime;
2126 char *ch_Service;
2127 CTime ch_Times[CHTSIZE];
2128 } CHash;
2129
2130 CHash CHashAry[CPMHSIZE];
2131
2132 int
2133 cpmip(const struct servtab *sep, int ctrl)
2134 {
2135 struct sockaddr_storage rss;
2136 socklen_t rssLen = sizeof(rss);
2137 int r = 0;
2138
2139 /*
2140 * If getpeername() fails, just let it through (if logging is
2141 * enabled the condition is caught elsewhere)
2142 */
2143
2144 if (sep->se_maxcpm > 0 &&
2145 getpeername(ctrl, (struct sockaddr *)&rss, &rssLen) == 0 ) {
2146 time_t t = time(NULL);
2147 int hv = 0xABC3D20F;
2148 int i;
2149 int cnt = 0;
2150 CHash *chBest = NULL;
2151 unsigned int ticks = t / CHTGRAN;
2152 struct sockaddr_in *sin4;
2153 #ifdef INET6
2154 struct sockaddr_in6 *sin6;
2155 #endif
2156
2157 sin4 = (struct sockaddr_in *)&rss;
2158 #ifdef INET6
2159 sin6 = (struct sockaddr_in6 *)&rss;
2160 #endif
2161 {
2162 char *p;
2163 int addrlen;
2164
2165 switch (rss.ss_family) {
2166 case AF_INET:
2167 p = (char *)&sin4->sin_addr;
2168 addrlen = sizeof(struct in_addr);
2169 break;
2170 #ifdef INET6
2171 case AF_INET6:
2172 p = (char *)&sin6->sin6_addr;
2173 addrlen = sizeof(struct in6_addr);
2174 break;
2175 #endif
2176 default:
2177 /* should not happen */
2178 return -1;
2179 }
2180
2181 for (i = 0; i < addrlen; ++i, ++p) {
2182 hv = (hv << 5) ^ (hv >> 23) ^ *p;
2183 }
2184 hv = (hv ^ (hv >> 16));
2185 }
2186 for (i = 0; i < 5; ++i) {
2187 CHash *ch = &CHashAry[(hv + i) & CPMHMASK];
2188
2189 if (rss.ss_family == AF_INET &&
2190 ch->ch_Family == AF_INET &&
2191 sin4->sin_addr.s_addr == ch->ch_Addr4.s_addr &&
2192 ch->ch_Service && strcmp(sep->se_service,
2193 ch->ch_Service) == 0) {
2194 chBest = ch;
2195 break;
2196 }
2197 #ifdef INET6
2198 if (rss.ss_family == AF_INET6 &&
2199 ch->ch_Family == AF_INET6 &&
2200 IN6_ARE_ADDR_EQUAL(&sin6->sin6_addr,
2201 &ch->ch_Addr6) != 0 &&
2202 ch->ch_Service && strcmp(sep->se_service,
2203 ch->ch_Service) == 0) {
2204 chBest = ch;
2205 break;
2206 }
2207 #endif
2208 if (chBest == NULL || ch->ch_LTime == 0 ||
2209 ch->ch_LTime < chBest->ch_LTime) {
2210 chBest = ch;
2211 }
2212 }
2213 if ((rss.ss_family == AF_INET &&
2214 (chBest->ch_Family != AF_INET ||
2215 sin4->sin_addr.s_addr != chBest->ch_Addr4.s_addr)) ||
2216 chBest->ch_Service == NULL ||
2217 strcmp(sep->se_service, chBest->ch_Service) != 0) {
2218 chBest->ch_Family = sin4->sin_family;
2219 chBest->ch_Addr4 = sin4->sin_addr;
2220 if (chBest->ch_Service)
2221 free(chBest->ch_Service);
2222 chBest->ch_Service = strdup(sep->se_service);
2223 bzero(chBest->ch_Times, sizeof(chBest->ch_Times));
2224 }
2225 #ifdef INET6
2226 if ((rss.ss_family == AF_INET6 &&
2227 (chBest->ch_Family != AF_INET6 ||
2228 IN6_ARE_ADDR_EQUAL(&sin6->sin6_addr,
2229 &chBest->ch_Addr6) == 0)) ||
2230 chBest->ch_Service == NULL ||
2231 strcmp(sep->se_service, chBest->ch_Service) != 0) {
2232 chBest->ch_Family = sin6->sin6_family;
2233 chBest->ch_Addr6 = sin6->sin6_addr;
2234 if (chBest->ch_Service)
2235 free(chBest->ch_Service);
2236 chBest->ch_Service = strdup(sep->se_service);
2237 bzero(chBest->ch_Times, sizeof(chBest->ch_Times));
2238 }
2239 #endif
2240 chBest->ch_LTime = t;
2241 {
2242 CTime *ct = &chBest->ch_Times[ticks % CHTSIZE];
2243 if (ct->ct_Ticks != ticks) {
2244 ct->ct_Ticks = ticks;
2245 ct->ct_Count = 0;
2246 }
2247 ++ct->ct_Count;
2248 }
2249 for (i = 0; i < CHTSIZE; ++i) {
2250 CTime *ct = &chBest->ch_Times[i];
2251 if (ct->ct_Ticks <= ticks &&
2252 ct->ct_Ticks >= ticks - CHTSIZE) {
2253 cnt += ct->ct_Count;
2254 }
2255 }
2256 if (cnt * (CHTSIZE * CHTGRAN) / 60 > sep->se_maxcpm) {
2257 char pname[INET6_ADDRSTRLEN];
2258
2259 getnameinfo((struct sockaddr *)&rss,
2260 ((struct sockaddr *)&rss)->sa_len,
2261 pname, sizeof(pname), NULL, 0,
2262 NI_NUMERICHOST|NI_WITHSCOPEID);
2263 r = -1;
2264 syslog(LOG_ERR,
2265 "%s from %s exceeded counts/min (limit %d/min)",
2266 sep->se_service, pname,
2267 sep->se_maxcpm);
2268 }
2269 }
2270 return(r);
2271 }
2272
2273 static struct conninfo *
2274 search_conn(struct servtab *sep, int ctrl)
2275 {
2276 struct sockaddr_storage ss;
2277 socklen_t sslen = sizeof(ss);
2278 struct conninfo *conn;
2279 int hv;
2280 char pname[NI_MAXHOST], pname2[NI_MAXHOST];
2281
2282 if (sep->se_maxperip <= 0)
2283 return NULL;
2284
2285 /*
2286 * If getpeername() fails, just let it through (if logging is
2287 * enabled the condition is caught elsewhere)
2288 */
2289 if (getpeername(ctrl, (struct sockaddr *)&ss, &sslen) != 0)
2290 return NULL;
2291
2292 switch (ss.ss_family) {
2293 case AF_INET:
2294 hv = hashval((char *)&((struct sockaddr_in *)&ss)->sin_addr,
2295 sizeof(struct in_addr));
2296 break;
2297 #ifdef INET6
2298 case AF_INET6:
2299 hv = hashval((char *)&((struct sockaddr_in6 *)&ss)->sin6_addr,
2300 sizeof(struct in6_addr));
2301 break;
2302 #endif
2303 default:
2304 /*
2305 * Since we only support AF_INET and AF_INET6, just
2306 * let other than AF_INET and AF_INET6 through.
2307 */
2308 return NULL;
2309 }
2310
2311 if (getnameinfo((struct sockaddr *)&ss, sslen, pname, sizeof(pname),
2312 NULL, 0, NI_NUMERICHOST | NI_WITHSCOPEID) != 0)
2313 return NULL;
2314
2315 LIST_FOREACH(conn, &sep->se_conn[hv], co_link) {
2316 if (getnameinfo((struct sockaddr *)&conn->co_addr,
2317 conn->co_addr.ss_len, pname2, sizeof(pname2), NULL, 0,
2318 NI_NUMERICHOST | NI_WITHSCOPEID) == 0 &&
2319 strcmp(pname, pname2) == 0)
2320 break;
2321 }
2322
2323 if (conn == NULL) {
2324 if ((conn = malloc(sizeof(struct conninfo))) == NULL) {
2325 syslog(LOG_ERR, "malloc: %m");
2326 exit(EX_OSERR);
2327 }
2328 conn->co_proc = malloc(sep->se_maxperip * sizeof(*conn->co_proc));
2329 if (conn->co_proc == NULL) {
2330 syslog(LOG_ERR, "malloc: %m");
2331 exit(EX_OSERR);
2332 }
2333 memcpy(&conn->co_addr, (struct sockaddr *)&ss, sslen);
2334 conn->co_numchild = 0;
2335 LIST_INSERT_HEAD(&sep->se_conn[hv], conn, co_link);
2336 }
2337
2338 /*
2339 * Since a child process is not invoked yet, we cannot
2340 * determine a pid of a child. So, co_proc and co_numchild
2341 * should be filled leter.
2342 */
2343
2344 return conn;
2345 }
2346
2347 static int
2348 room_conn(struct servtab *sep, struct conninfo *conn)
2349 {
2350 char pname[NI_MAXHOST];
2351
2352 if (conn->co_numchild >= sep->se_maxperip) {
2353 getnameinfo((struct sockaddr *)&conn->co_addr,
2354 conn->co_addr.ss_len, pname, sizeof(pname), NULL, 0,
2355 NI_NUMERICHOST | NI_WITHSCOPEID);
2356 syslog(LOG_ERR, "%s from %s exceeded counts (limit %d)",
2357 sep->se_service, pname, sep->se_maxperip);
2358 return 0;
2359 }
2360 return 1;
2361 }
2362
2363 static void
2364 addchild_conn(struct conninfo *conn, pid_t pid)
2365 {
2366 struct procinfo *proc;
2367
2368 if (conn == NULL)
2369 return;
2370
2371 if ((proc = search_proc(pid, 1)) != NULL) {
2372 if (proc->pr_conn != NULL) {
2373 syslog(LOG_ERR,
2374 "addchild_conn: child already on process list");
2375 exit(EX_OSERR);
2376 }
2377 proc->pr_conn = conn;
2378 }
2379
2380 conn->co_proc[conn->co_numchild++] = proc;
2381 }
2382
2383 static void
2384 reapchild_conn(pid_t pid)
2385 {
2386 struct procinfo *proc;
2387 struct conninfo *conn;
2388 int i;
2389
2390 if ((proc = search_proc(pid, 0)) == NULL)
2391 return;
2392 if ((conn = proc->pr_conn) == NULL)
2393 return;
2394 for (i = 0; i < conn->co_numchild; ++i)
2395 if (conn->co_proc[i] == proc) {
2396 conn->co_proc[i] = conn->co_proc[--conn->co_numchild];
2397 break;
2398 }
2399 free_proc(proc);
2400 free_conn(conn);
2401 }
2402
2403 static void
2404 resize_conn(struct servtab *sep, int maxpip)
2405 {
2406 struct conninfo *conn;
2407 int i, j;
2408
2409 if (sep->se_maxperip <= 0)
2410 return;
2411 if (maxpip <= 0) {
2412 free_connlist(sep);
2413 return;
2414 }
2415 for (i = 0; i < PERIPSIZE; ++i) {
2416 LIST_FOREACH(conn, &sep->se_conn[i], co_link) {
2417 for (j = maxpip; j < conn->co_numchild; ++j)
2418 free_proc(conn->co_proc[j]);
2419 conn->co_proc = realloc(conn->co_proc,
2420 maxpip * sizeof(*conn->co_proc));
2421 if (conn->co_proc == NULL) {
2422 syslog(LOG_ERR, "realloc: %m");
2423 exit(EX_OSERR);
2424 }
2425 if (conn->co_numchild > maxpip)
2426 conn->co_numchild = maxpip;
2427 }
2428 }
2429 }
2430
2431 static void
2432 free_connlist(struct servtab *sep)
2433 {
2434 struct conninfo *conn;
2435 int i, j;
2436
2437 for (i = 0; i < PERIPSIZE; ++i) {
2438 while ((conn = LIST_FIRST(&sep->se_conn[i])) != NULL) {
2439 for (j = 0; j < conn->co_numchild; ++j)
2440 free_proc(conn->co_proc[j]);
2441 conn->co_numchild = 0;
2442 free_conn(conn);
2443 }
2444 }
2445 }
2446
2447 static void
2448 free_conn(struct conninfo *conn)
2449 {
2450 if (conn == NULL)
2451 return;
2452 if (conn->co_numchild <= 0) {
2453 LIST_REMOVE(conn, co_link);
2454 free(conn->co_proc);
2455 free(conn);
2456 }
2457 }
2458
2459 static struct procinfo *
2460 search_proc(pid_t pid, int add)
2461 {
2462 struct procinfo *proc;
2463 int hv;
2464
2465 hv = hashval((char *)&pid, sizeof(pid));
2466 LIST_FOREACH(proc, &proctable[hv], pr_link) {
2467 if (proc->pr_pid == pid)
2468 break;
2469 }
2470 if (proc == NULL && add) {
2471 if ((proc = malloc(sizeof(struct procinfo))) == NULL) {
2472 syslog(LOG_ERR, "malloc: %m");
2473 exit(EX_OSERR);
2474 }
2475 proc->pr_pid = pid;
2476 proc->pr_conn = NULL;
2477 LIST_INSERT_HEAD(&proctable[hv], proc, pr_link);
2478 }
2479 return proc;
2480 }
2481
2482 static void
2483 free_proc(struct procinfo *proc)
2484 {
2485 if (proc == NULL)
2486 return;
2487 LIST_REMOVE(proc, pr_link);
2488 free(proc);
2489 }
2490
2491 static int
2492 hashval(char *p, int len)
2493 {
2494 int i, hv = 0xABC3D20F;
2495
2496 for (i = 0; i < len; ++i, ++p)
2497 hv = (hv << 5) ^ (hv >> 23) ^ *p;
2498 hv = (hv ^ (hv >> 16)) & (PERIPSIZE - 1);
2499 return hv;
2500 }
DragonFly BSD