?  search:
summary | log | graphiclog1 | graphiclog2 | commit | commitdiff | tree | refs | edit | fork
blame | history | raw | HEAD
dev/ow: Tag an unreachable switch default.
[freebsd-src.git] / usr.sbin / inetd / inetd.c
blob9f913851bec8cb642f387281f77df30f4a71a815
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 * 4. Neither the name of the University nor the names of its contributors
14 * may be used to endorse or promote products derived from this software
15 * without specific prior written permission.
16 *
17 * THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND
18 * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
19 * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
20 * ARE DISCLAIMED. IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE
21 * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
22 * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
23 * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
24 * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
25 * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
26 * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
27 * SUCH DAMAGE.
28 */
29
30 #ifndef lint
31 static const char copyright[] =
32 "@(#) Copyright (c) 1983, 1991, 1993, 1994\n\
33 The Regents of the University of California. All rights reserved.\n";
34 #endif /* not lint */
35
36 #ifndef lint
37 #if 0
38 static char sccsid[] = "@(#)from: inetd.c 8.4 (Berkeley) 4/13/94";
39 #endif
40 #endif /* not lint */
41
42 #include <sys/cdefs.h>
43 __FBSDID("$FreeBSD$");
44
45 /*
46 * Inetd - Internet super-server
47 *
48 * This program invokes all internet services as needed. Connection-oriented
49 * services are invoked each time a connection is made, by creating a process.
50 * This process is passed the connection as file descriptor 0 and is expected
51 * to do a getpeername to find out the source host and port.
52 *
53 * Datagram oriented services are invoked when a datagram
54 * arrives; a process is created and passed a pending message
55 * on file descriptor 0. Datagram servers may either connect
56 * to their peer, freeing up the original socket for inetd
57 * to receive further messages on, or ``take over the socket'',
58 * processing all arriving datagrams and, eventually, timing
59 * out. The first type of server is said to be ``multi-threaded'';
60 * the second type of server ``single-threaded''.
61 *
62 * Inetd uses a configuration file which is read at startup
63 * and, possibly, at some later time in response to a hangup signal.
64 * The configuration file is ``free format'' with fields given in the
65 * order shown below. Continuation lines for an entry must begin with
66 * a space or tab. All fields must be present in each entry.
67 *
68 * service name must be in /etc/services
69 * or name a tcpmux service
70 * or specify a unix domain socket
71 * socket type stream/dgram/raw/rdm/seqpacket
72 * protocol tcp[4][6], udp[4][6], unix
73 * wait/nowait single-threaded/multi-threaded
74 * user[:group][/login-class] user/group/login-class to run daemon as
75 * server program full path name
76 * server program arguments maximum of MAXARGS (20)
77 *
78 * TCP services without official port numbers are handled with the
79 * RFC1078-based tcpmux internal service. Tcpmux listens on port 1 for
80 * requests. When a connection is made from a foreign host, the service
81 * requested is passed to tcpmux, which looks it up in the servtab list
82 * and returns the proper entry for the service. Tcpmux returns a
83 * negative reply if the service doesn't exist, otherwise the invoked
84 * server is expected to return the positive reply if the service type in
85 * inetd.conf file has the prefix "tcpmux/". If the service type has the
86 * prefix "tcpmux/+", tcpmux will return the positive reply for the
87 * process; this is for compatibility with older server code, and also
88 * allows you to invoke programs that use stdin/stdout without putting any
89 * special server code in them. Services that use tcpmux are "nowait"
90 * because they do not have a well-known port and hence cannot listen
91 * for new requests.
92 *
93 * For RPC services
94 * service name/version must be in /etc/rpc
95 * socket type stream/dgram/raw/rdm/seqpacket
96 * protocol rpc/tcp[4][6], rpc/udp[4][6]
97 * wait/nowait single-threaded/multi-threaded
98 * user[:group][/login-class] user/group/login-class to run daemon as
99 * server program full path name
100 * server program arguments maximum of MAXARGS
101 *
102 * Comment lines are indicated by a `#' in column 1.
103 *
104 * #ifdef IPSEC
105 * Comment lines that start with "#@" denote IPsec policy string, as described
106 * in ipsec_set_policy(3). This will affect all the following items in
107 * inetd.conf(8). To reset the policy, just use "#@" line. By default,
108 * there's no IPsec policy.
109 * #endif
110 */
111 #include <sys/param.h>
112 #include <sys/ioctl.h>
113 #include <sys/mman.h>
114 #include <sys/wait.h>
115 #include <sys/time.h>
116 #include <sys/resource.h>
117 #include <sys/stat.h>
118 #include <sys/un.h>
119
120 #include <netinet/in.h>
121 #include <netinet/tcp.h>
122 #include <arpa/inet.h>
123 #include <rpc/rpc.h>
124 #include <rpc/pmap_clnt.h>
125
126 #include <ctype.h>
127 #include <errno.h>
128 #include <err.h>
129 #include <fcntl.h>
130 #include <grp.h>
131 #include <libutil.h>
132 #include <limits.h>
133 #include <netdb.h>
134 #include <pwd.h>
135 #include <signal.h>
136 #include <stdio.h>
137 #include <stdlib.h>
138 #include <string.h>
139 #include <sysexits.h>
140 #include <syslog.h>
141 #include <tcpd.h>
142 #include <unistd.h>
143
144 #include "inetd.h"
145 #include "pathnames.h"
146
147 #ifdef IPSEC
148 #include <netipsec/ipsec.h>
149 #ifndef IPSEC_POLICY_IPSEC /* no ipsec support on old ipsec */
150 #undef IPSEC
151 #endif
152 #endif
153
154 #ifndef LIBWRAP_ALLOW_FACILITY
155 # define LIBWRAP_ALLOW_FACILITY LOG_AUTH
156 #endif
157 #ifndef LIBWRAP_ALLOW_SEVERITY
158 # define LIBWRAP_ALLOW_SEVERITY LOG_INFO
159 #endif
160 #ifndef LIBWRAP_DENY_FACILITY
161 # define LIBWRAP_DENY_FACILITY LOG_AUTH
162 #endif
163 #ifndef LIBWRAP_DENY_SEVERITY
164 # define LIBWRAP_DENY_SEVERITY LOG_WARNING
165 #endif
166
167 #define ISWRAP(sep) \
168 ( ((wrap_ex && !(sep)->se_bi) || (wrap_bi && (sep)->se_bi)) \
169 && (sep->se_family == AF_INET || sep->se_family == AF_INET6) \
170 && ( ((sep)->se_accept && (sep)->se_socktype == SOCK_STREAM) \
171 || (sep)->se_socktype == SOCK_DGRAM))
172
173 #ifdef LOGIN_CAP
174 #include <login_cap.h>
175
176 /* see init.c */
177 #define RESOURCE_RC "daemon"
178
179 #endif
180
181 #ifndef MAXCHILD
182 #define MAXCHILD -1 /* maximum number of this service
183 < 0 = no limit */
184 #endif
185
186 #ifndef MAXCPM
187 #define MAXCPM -1 /* rate limit invocations from a
188 single remote address,
189 < 0 = no limit */
190 #endif
191
192 #ifndef MAXPERIP
193 #define MAXPERIP -1 /* maximum number of this service
194 from a single remote address,
195 < 0 = no limit */
196 #endif
197
198 #ifndef TOOMANY
199 #define TOOMANY 256 /* don't start more than TOOMANY */
200 #endif
201 #define CNT_INTVL 60 /* servers in CNT_INTVL sec. */
202 #define RETRYTIME (60*10) /* retry after bind or server fail */
203 #define MAX_MAXCHLD 32767 /* max allowable max children */
204
205 #define SIGBLOCK (sigmask(SIGCHLD)|sigmask(SIGHUP)|sigmask(SIGALRM))
206
207 void close_sep(struct servtab *);
208 void flag_signal(int);
209 void flag_config(int);
210 void config(void);
211 int cpmip(const struct servtab *, int);
212 void endconfig(void);
213 struct servtab *enter(struct servtab *);
214 void freeconfig(struct servtab *);
215 struct servtab *getconfigent(void);
216 int matchservent(const char *, const char *, const char *);
217 char *nextline(FILE *);
218 void addchild(struct servtab *, int);
219 void flag_reapchild(int);
220 void reapchild(void);
221 void enable(struct servtab *);
222 void disable(struct servtab *);
223 void flag_retry(int);
224 void retry(void);
225 int setconfig(void);
226 void setup(struct servtab *);
227 #ifdef IPSEC
228 void ipsecsetup(struct servtab *);
229 #endif
230 void unregisterrpc(register struct servtab *sep);
231 static struct conninfo *search_conn(struct servtab *sep, int ctrl);
232 static int room_conn(struct servtab *sep, struct conninfo *conn);
233 static void addchild_conn(struct conninfo *conn, pid_t pid);
234 static void reapchild_conn(pid_t pid);
235 static void free_conn(struct conninfo *conn);
236 static void resize_conn(struct servtab *sep, int maxperip);
237 static void free_connlist(struct servtab *sep);
238 static void free_proc(struct procinfo *);
239 static struct procinfo *search_proc(pid_t pid, int add);
240 static int hashval(char *p, int len);
241
242 int allow_severity;
243 int deny_severity;
244 int wrap_ex = 0;
245 int wrap_bi = 0;
246 int debug = 0;
247 int dolog = 0;
248 int maxsock; /* highest-numbered descriptor */
249 fd_set allsock;
250 int options;
251 int timingout;
252 int toomany = TOOMANY;
253 int maxchild = MAXCHILD;
254 int maxcpm = MAXCPM;
255 int maxperip = MAXPERIP;
256 struct servent *sp;
257 struct rpcent *rpc;
258 char *hostname = NULL;
259 struct sockaddr_in *bind_sa4;
260 int v4bind_ok = 0;
261 #ifdef INET6
262 struct sockaddr_in6 *bind_sa6;
263 int v6bind_ok = 0;
264 #endif
265 int signalpipe[2];
266 #ifdef SANITY_CHECK
267 int nsock;
268 #endif
269 uid_t euid;
270 gid_t egid;
271 mode_t mask;
272
273 struct servtab *servtab;
274
275 extern struct biltin biltins[];
276
277 const char *CONFIG = _PATH_INETDCONF;
278 const char *pid_file = _PATH_INETDPID;
279 struct pidfh *pfh = NULL;
280
281 struct netconfig *udpconf, *tcpconf, *udp6conf, *tcp6conf;
282
283 static LIST_HEAD(, procinfo) proctable[PERIPSIZE];
284
285 int
286 getvalue(const char *arg, int *value, const char *whine)
287 {
288 int tmp;
289 char *p;
290
291 tmp = strtol(arg, &p, 0);
292 if (tmp < 0 || *p) {
293 syslog(LOG_ERR, whine, arg);
294 return 1; /* failure */
295 }
296 *value = tmp;
297 return 0; /* success */
298 }
299
300 static sa_family_t
301 whichaf(struct request_info *req)
302 {
303 struct sockaddr *sa;
304
305 sa = (struct sockaddr *)req->client->sin;
306 if (sa == NULL)
307 return AF_UNSPEC;
308 if (sa->sa_family == AF_INET6 &&
309 IN6_IS_ADDR_V4MAPPED(&((struct sockaddr_in6 *)sa)->sin6_addr))
310 return AF_INET;
311 return sa->sa_family;
312 }
313
314 int
315 main(int argc, char **argv)
316 {
317 struct servtab *sep;
318 struct passwd *pwd;
319 struct group *grp;
320 struct sigaction sa, saalrm, sachld, sahup, sapipe;
321 int ch, dofork;
322 pid_t pid;
323 char buf[50];
324 #ifdef LOGIN_CAP
325 login_cap_t *lc = NULL;
326 #endif
327 struct request_info req;
328 int denied;
329 char *service = NULL;
330 struct sockaddr_storage peer;
331 int i;
332 struct addrinfo hints, *res;
333 const char *servname;
334 int error;
335 struct conninfo *conn;
336
337 openlog("inetd", LOG_PID | LOG_NOWAIT | LOG_PERROR, LOG_DAEMON);
338
339 while ((ch = getopt(argc, argv, "dlwWR:a:c:C:p:s:")) != -1)
340 switch(ch) {
341 case 'd':
342 debug = 1;
343 options |= SO_DEBUG;
344 break;
345 case 'l':
346 dolog = 1;
347 break;
348 case 'R':
349 getvalue(optarg, &toomany,
350 "-R %s: bad value for service invocation rate");
351 break;
352 case 'c':
353 getvalue(optarg, &maxchild,
354 "-c %s: bad value for maximum children");
355 break;
356 case 'C':
357 getvalue(optarg, &maxcpm,
358 "-C %s: bad value for maximum children/minute");
359 break;
360 case 'a':
361 hostname = optarg;
362 break;
363 case 'p':
364 pid_file = optarg;
365 break;
366 case 's':
367 getvalue(optarg, &maxperip,
368 "-s %s: bad value for maximum children per source address");
369 break;
370 case 'w':
371 wrap_ex++;
372 break;
373 case 'W':
374 wrap_bi++;
375 break;
376 case '?':
377 default:
378 syslog(LOG_ERR,
379 "usage: inetd [-dlwW] [-a address] [-R rate]"
380 " [-c maximum] [-C rate]"
381 " [-p pidfile] [conf-file]");
382 exit(EX_USAGE);
383 }
384 /*
385 * Initialize Bind Addrs.
386 * When hostname is NULL, wild card bind addrs are obtained from
387 * getaddrinfo(). But getaddrinfo() requires at least one of
388 * hostname or servname is non NULL.
389 * So when hostname is NULL, set dummy value to servname.
390 * Since getaddrinfo() doesn't accept numeric servname, and
391 * we doesn't use ai_socktype of struct addrinfo returned
392 * from getaddrinfo(), we set dummy value to ai_socktype.
393 */
394 servname = (hostname == NULL) ? "0" /* dummy */ : NULL;
395
396 bzero(&hints, sizeof(struct addrinfo));
397 hints.ai_flags = AI_PASSIVE;
398 hints.ai_family = AF_UNSPEC;
399 hints.ai_socktype = SOCK_STREAM; /* dummy */
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 (v4bind_ok)
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 v4bind_ok = 1;
420 continue;
421 #ifdef INET6
422 case AF_INET6:
423 if (v6bind_ok)
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 v6bind_ok = 1;
429 continue;
430 #endif
431 }
432 if (v4bind_ok
433 #ifdef INET6
434 && v6bind_ok
435 #endif
436 )
437 break;
438 } while ((res = res->ai_next) != NULL);
439 if (!v4bind_ok
440 #ifdef INET6
441 && !v6bind_ok
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 (access(CONFIG, R_OK) < 0)
458 syslog(LOG_ERR, "Accessing %s: %m, continuing anyway.", CONFIG);
459 if (debug == 0) {
460 pid_t otherpid;
461
462 pfh = pidfile_open(pid_file, 0600, &otherpid);
463 if (pfh == NULL) {
464 if (errno == EEXIST) {
465 syslog(LOG_ERR, "%s already running, pid: %d",
466 getprogname(), otherpid);
467 exit(EX_OSERR);
468 }
469 syslog(LOG_WARNING, "pidfile_open() failed: %m");
470 }
471
472 if (daemon(0, 0) < 0) {
473 syslog(LOG_WARNING, "daemon(0,0) failed: %m");
474 }
475 /* From now on we don't want syslog messages going to stderr. */
476 closelog();
477 openlog("inetd", LOG_PID | LOG_NOWAIT, LOG_DAEMON);
478 /*
479 * In case somebody has started inetd manually, we need to
480 * clear the logname, so that old servers run as root do not
481 * get the user's logname..
482 */
483 if (setlogin("") < 0) {
484 syslog(LOG_WARNING, "cannot clear logname: %m");
485 /* no big deal if it fails.. */
486 }
487 if (pfh != NULL && pidfile_write(pfh) == -1) {
488 syslog(LOG_WARNING, "pidfile_write(): %m");
489 }
490 }
491
492 if (madvise(NULL, 0, MADV_PROTECT) != 0)
493 syslog(LOG_WARNING, "madvise() failed: %s", strerror(errno));
494
495 for (i = 0; i < PERIPSIZE; ++i)
496 LIST_INIT(&proctable[i]);
497
498 if (v4bind_ok) {
499 udpconf = getnetconfigent("udp");
500 tcpconf = getnetconfigent("tcp");
501 if (udpconf == NULL || tcpconf == NULL) {
502 syslog(LOG_ERR, "unknown rpc/udp or rpc/tcp");
503 exit(EX_USAGE);
504 }
505 }
506 #ifdef INET6
507 if (v6bind_ok) {
508 udp6conf = getnetconfigent("udp6");
509 tcp6conf = getnetconfigent("tcp6");
510 if (udp6conf == NULL || tcp6conf == NULL) {
511 syslog(LOG_ERR, "unknown rpc/udp6 or rpc/tcp6");
512 exit(EX_USAGE);
513 }
514 }
515 #endif
516
517 sa.sa_flags = 0;
518 sigemptyset(&sa.sa_mask);
519 sigaddset(&sa.sa_mask, SIGALRM);
520 sigaddset(&sa.sa_mask, SIGCHLD);
521 sigaddset(&sa.sa_mask, SIGHUP);
522 sa.sa_handler = flag_retry;
523 sigaction(SIGALRM, &sa, &saalrm);
524 config();
525 sa.sa_handler = flag_config;
526 sigaction(SIGHUP, &sa, &sahup);
527 sa.sa_handler = flag_reapchild;
528 sigaction(SIGCHLD, &sa, &sachld);
529 sa.sa_handler = SIG_IGN;
530 sigaction(SIGPIPE, &sa, &sapipe);
531
532 {
533 /* space for daemons to overwrite environment for ps */
534 #define DUMMYSIZE 100
535 char dummy[DUMMYSIZE];
536
537 (void)memset(dummy, 'x', DUMMYSIZE - 1);
538 dummy[DUMMYSIZE - 1] = '\0';
539 (void)setenv("inetd_dummy", dummy, 1);
540 }
541
542 if (pipe2(signalpipe, O_CLOEXEC) != 0) {
543 syslog(LOG_ERR, "pipe: %m");
544 exit(EX_OSERR);
545 }
546 FD_SET(signalpipe[0], &allsock);
547 #ifdef SANITY_CHECK
548 nsock++;
549 #endif
550 if (signalpipe[0] > maxsock)
551 maxsock = signalpipe[0];
552 if (signalpipe[1] > maxsock)
553 maxsock = signalpipe[1];
554
555 for (;;) {
556 int n, ctrl;
557 fd_set readable;
558
559 #ifdef SANITY_CHECK
560 if (nsock == 0) {
561 syslog(LOG_ERR, "%s: nsock=0", __func__);
562 exit(EX_SOFTWARE);
563 }
564 #endif
565 readable = allsock;
566 if ((n = select(maxsock + 1, &readable, (fd_set *)0,
567 (fd_set *)0, (struct timeval *)0)) <= 0) {
568 if (n < 0 && errno != EINTR) {
569 syslog(LOG_WARNING, "select: %m");
570 sleep(1);
571 }
572 continue;
573 }
574 /* handle any queued signal flags */
575 if (FD_ISSET(signalpipe[0], &readable)) {
576 int nsig;
577 if (ioctl(signalpipe[0], FIONREAD, &nsig) != 0) {
578 syslog(LOG_ERR, "ioctl: %m");
579 exit(EX_OSERR);
580 }
581 while (--nsig >= 0) {
582 char c;
583 if (read(signalpipe[0], &c, 1) != 1) {
584 syslog(LOG_ERR, "read: %m");
585 exit(EX_OSERR);
586 }
587 if (debug)
588 warnx("handling signal flag %c", c);
589 switch(c) {
590 case 'A': /* sigalrm */
591 retry();
592 break;
593 case 'C': /* sigchld */
594 reapchild();
595 break;
596 case 'H': /* sighup */
597 config();
598 break;
599 }
600 }
601 }
602 for (sep = servtab; n && sep; sep = sep->se_next)
603 if (sep->se_fd != -1 && FD_ISSET(sep->se_fd, &readable)) {
604 n--;
605 if (debug)
606 warnx("someone wants %s", sep->se_service);
607 dofork = !sep->se_bi || sep->se_bi->bi_fork || ISWRAP(sep);
608 conn = NULL;
609 if (sep->se_accept && sep->se_socktype == SOCK_STREAM) {
610 i = 1;
611 if (ioctl(sep->se_fd, FIONBIO, &i) < 0)
612 syslog(LOG_ERR, "ioctl (FIONBIO, 1): %m");
613 ctrl = accept(sep->se_fd, (struct sockaddr *)0,
614 (socklen_t *)0);
615 if (debug)
616 warnx("accept, ctrl %d", ctrl);
617 if (ctrl < 0) {
618 if (errno != EINTR)
619 syslog(LOG_WARNING,
620 "accept (for %s): %m",
621 sep->se_service);
622 if (sep->se_accept &&
623 sep->se_socktype == SOCK_STREAM)
624 close(ctrl);
625 continue;
626 }
627 i = 0;
628 if (ioctl(sep->se_fd, FIONBIO, &i) < 0)
629 syslog(LOG_ERR, "ioctl1(FIONBIO, 0): %m");
630 if (ioctl(ctrl, FIONBIO, &i) < 0)
631 syslog(LOG_ERR, "ioctl2(FIONBIO, 0): %m");
632 if (cpmip(sep, ctrl) < 0) {
633 close(ctrl);
634 continue;
635 }
636 if (dofork &&
637 (conn = search_conn(sep, ctrl)) != NULL &&
638 !room_conn(sep, conn)) {
639 close(ctrl);
640 continue;
641 }
642 } else
643 ctrl = sep->se_fd;
644 if (dolog && !ISWRAP(sep)) {
645 char pname[NI_MAXHOST] = "unknown";
646 socklen_t sl;
647 sl = sizeof(peer);
648 if (getpeername(ctrl, (struct sockaddr *)
649 &peer, &sl)) {
650 sl = sizeof(peer);
651 if (recvfrom(ctrl, buf, sizeof(buf),
652 MSG_PEEK,
653 (struct sockaddr *)&peer,
654 &sl) >= 0) {
655 getnameinfo((struct sockaddr *)&peer,
656 peer.ss_len,
657 pname, sizeof(pname),
658 NULL, 0, NI_NUMERICHOST);
659 }
660 } else {
661 getnameinfo((struct sockaddr *)&peer,
662 peer.ss_len,
663 pname, sizeof(pname),
664 NULL, 0, NI_NUMERICHOST);
665 }
666 syslog(LOG_INFO,"%s from %s", sep->se_service, pname);
667 }
668 (void) sigblock(SIGBLOCK);
669 pid = 0;
670 /*
671 * Fork for all external services, builtins which need to
672 * fork and anything we're wrapping (as wrapping might
673 * block or use hosts_options(5) twist).
674 */
675 if (dofork) {
676 if (sep->se_count++ == 0)
677 (void)clock_gettime(CLOCK_MONOTONIC_FAST, &sep->se_time);
678 else if (toomany > 0 && sep->se_count >= toomany) {
679 struct timespec now;
680
681 (void)clock_gettime(CLOCK_MONOTONIC_FAST, &now);
682 if (now.tv_sec - sep->se_time.tv_sec >
683 CNT_INTVL) {
684 sep->se_time = now;
685 sep->se_count = 1;
686 } else {
687 syslog(LOG_ERR,
688 "%s/%s server failing (looping), service terminated",
689 sep->se_service, sep->se_proto);
690 if (sep->se_accept &&
691 sep->se_socktype == SOCK_STREAM)
692 close(ctrl);
693 close_sep(sep);
694 free_conn(conn);
695 sigsetmask(0L);
696 if (!timingout) {
697 timingout = 1;
698 alarm(RETRYTIME);
699 }
700 continue;
701 }
702 }
703 pid = fork();
704 }
705 if (pid < 0) {
706 syslog(LOG_ERR, "fork: %m");
707 if (sep->se_accept &&
708 sep->se_socktype == SOCK_STREAM)
709 close(ctrl);
710 free_conn(conn);
711 sigsetmask(0L);
712 sleep(1);
713 continue;
714 }
715 if (pid) {
716 addchild_conn(conn, pid);
717 addchild(sep, pid);
718 }
719 sigsetmask(0L);
720 if (pid == 0) {
721 pidfile_close(pfh);
722 if (dofork) {
723 sigaction(SIGALRM, &saalrm, (struct sigaction *)0);
724 sigaction(SIGCHLD, &sachld, (struct sigaction *)0);
725 sigaction(SIGHUP, &sahup, (struct sigaction *)0);
726 /* SIGPIPE reset before exec */
727 }
728 /*
729 * Call tcpmux to find the real service to exec.
730 */
731 if (sep->se_bi &&
732 sep->se_bi->bi_fn == (bi_fn_t *) tcpmux) {
733 sep = tcpmux(ctrl);
734 if (sep == NULL) {
735 close(ctrl);
736 _exit(0);
737 }
738 }
739 if (ISWRAP(sep)) {
740 inetd_setproctitle("wrapping", ctrl);
741 service = sep->se_server_name ?
742 sep->se_server_name : sep->se_service;
743 request_init(&req, RQ_DAEMON, service, RQ_FILE, ctrl, 0);
744 fromhost(&req);
745 deny_severity = LIBWRAP_DENY_FACILITY|LIBWRAP_DENY_SEVERITY;
746 allow_severity = LIBWRAP_ALLOW_FACILITY|LIBWRAP_ALLOW_SEVERITY;
747 denied = !hosts_access(&req);
748 if (denied) {
749 syslog(deny_severity,
750 "refused connection from %.500s, service %s (%s%s)",
751 eval_client(&req), service, sep->se_proto,
752 (whichaf(&req) == AF_INET6) ? "6" : "");
753 if (sep->se_socktype != SOCK_STREAM)
754 recv(ctrl, buf, sizeof (buf), 0);
755 if (dofork) {
756 sleep(1);
757 _exit(0);
758 }
759 }
760 if (dolog) {
761 syslog(allow_severity,
762 "connection from %.500s, service %s (%s%s)",
763 eval_client(&req), service, sep->se_proto,
764 (whichaf(&req) == AF_INET6) ? "6" : "");
765 }
766 }
767 if (sep->se_bi) {
768 (*sep->se_bi->bi_fn)(ctrl, sep);
769 } else {
770 if (debug)
771 warnx("%d execl %s",
772 getpid(), sep->se_server);
773 /* Clear close-on-exec. */
774 if (fcntl(ctrl, F_SETFD, 0) < 0) {
775 syslog(LOG_ERR,
776 "%s/%s: fcntl (F_SETFD, 0): %m",
777 sep->se_service, sep->se_proto);
778 _exit(EX_OSERR);
779 }
780 if (ctrl != 0) {
781 dup2(ctrl, 0);
782 close(ctrl);
783 }
784 dup2(0, 1);
785 dup2(0, 2);
786 if ((pwd = getpwnam(sep->se_user)) == NULL) {
787 syslog(LOG_ERR,
788 "%s/%s: %s: no such user",
789 sep->se_service, sep->se_proto,
790 sep->se_user);
791 if (sep->se_socktype != SOCK_STREAM)
792 recv(0, buf, sizeof (buf), 0);
793 _exit(EX_NOUSER);
794 }
795 grp = NULL;
796 if ( sep->se_group != NULL
797 && (grp = getgrnam(sep->se_group)) == NULL
798 ) {
799 syslog(LOG_ERR,
800 "%s/%s: %s: no such group",
801 sep->se_service, sep->se_proto,
802 sep->se_group);
803 if (sep->se_socktype != SOCK_STREAM)
804 recv(0, buf, sizeof (buf), 0);
805 _exit(EX_NOUSER);
806 }
807 if (grp != NULL)
808 pwd->pw_gid = grp->gr_gid;
809 #ifdef LOGIN_CAP
810 if ((lc = login_getclass(sep->se_class)) == NULL) {
811 /* error syslogged by getclass */
812 syslog(LOG_ERR,
813 "%s/%s: %s: login class error",
814 sep->se_service, sep->se_proto,
815 sep->se_class);
816 if (sep->se_socktype != SOCK_STREAM)
817 recv(0, buf, sizeof (buf), 0);
818 _exit(EX_NOUSER);
819 }
820 #endif
821 if (setsid() < 0) {
822 syslog(LOG_ERR,
823 "%s: can't setsid(): %m",
824 sep->se_service);
825 /* _exit(EX_OSERR); not fatal yet */
826 }
827 #ifdef LOGIN_CAP
828 if (setusercontext(lc, pwd, pwd->pw_uid,
829 LOGIN_SETALL & ~LOGIN_SETMAC)
830 != 0) {
831 syslog(LOG_ERR,
832 "%s: can't setusercontext(..%s..): %m",
833 sep->se_service, sep->se_user);
834 _exit(EX_OSERR);
835 }
836 login_close(lc);
837 #else
838 if (pwd->pw_uid) {
839 if (setlogin(sep->se_user) < 0) {
840 syslog(LOG_ERR,
841 "%s: can't setlogin(%s): %m",
842 sep->se_service, sep->se_user);
843 /* _exit(EX_OSERR); not yet */
844 }
845 if (setgid(pwd->pw_gid) < 0) {
846 syslog(LOG_ERR,
847 "%s: can't set gid %d: %m",
848 sep->se_service, pwd->pw_gid);
849 _exit(EX_OSERR);
850 }
851 (void) initgroups(pwd->pw_name,
852 pwd->pw_gid);
853 if (setuid(pwd->pw_uid) < 0) {
854 syslog(LOG_ERR,
855 "%s: can't set uid %d: %m",
856 sep->se_service, pwd->pw_uid);
857 _exit(EX_OSERR);
858 }
859 }
860 #endif
861 sigaction(SIGPIPE, &sapipe,
862 (struct sigaction *)0);
863 execv(sep->se_server, sep->se_argv);
864 syslog(LOG_ERR,
865 "cannot execute %s: %m", sep->se_server);
866 if (sep->se_socktype != SOCK_STREAM)
867 recv(0, buf, sizeof (buf), 0);
868 }
869 if (dofork)
870 _exit(0);
871 }
872 if (sep->se_accept && sep->se_socktype == SOCK_STREAM)
873 close(ctrl);
874 }
875 }
876 }
877
878 /*
879 * Add a signal flag to the signal flag queue for later handling
880 */
881
882 void
883 flag_signal(int c)
884 {
885 char ch = c;
886
887 if (write(signalpipe[1], &ch, 1) != 1) {
888 syslog(LOG_ERR, "write: %m");
889 _exit(EX_OSERR);
890 }
891 }
892
893 /*
894 * Record a new child pid for this service. If we've reached the
895 * limit on children, then stop accepting incoming requests.
896 */
897
898 void
899 addchild(struct servtab *sep, pid_t pid)
900 {
901 if (sep->se_maxchild <= 0)
902 return;
903 #ifdef SANITY_CHECK
904 if (sep->se_numchild >= sep->se_maxchild) {
905 syslog(LOG_ERR, "%s: %d >= %d",
906 __func__, sep->se_numchild, sep->se_maxchild);
907 exit(EX_SOFTWARE);
908 }
909 #endif
910 sep->se_pids[sep->se_numchild++] = pid;
911 if (sep->se_numchild == sep->se_maxchild)
912 disable(sep);
913 }
914
915 /*
916 * Some child process has exited. See if it's on somebody's list.
917 */
918
919 void
920 flag_reapchild(int signo __unused)
921 {
922 flag_signal('C');
923 }
924
925 void
926 reapchild(void)
927 {
928 int k, status;
929 pid_t pid;
930 struct servtab *sep;
931
932 for (;;) {
933 pid = wait3(&status, WNOHANG, (struct rusage *)0);
934 if (pid <= 0)
935 break;
936 if (debug)
937 warnx("%d reaped, %s %u", pid,
938 WIFEXITED(status) ? "status" : "signal",
939 WIFEXITED(status) ? WEXITSTATUS(status)
940 : WTERMSIG(status));
941 for (sep = servtab; sep; sep = sep->se_next) {
942 for (k = 0; k < sep->se_numchild; k++)
943 if (sep->se_pids[k] == pid)
944 break;
945 if (k == sep->se_numchild)
946 continue;
947 if (sep->se_numchild == sep->se_maxchild)
948 enable(sep);
949 sep->se_pids[k] = sep->se_pids[--sep->se_numchild];
950 if (WIFSIGNALED(status) || WEXITSTATUS(status))
951 syslog(LOG_WARNING,
952 "%s[%d]: exited, %s %u",
953 sep->se_server, pid,
954 WIFEXITED(status) ? "status" : "signal",
955 WIFEXITED(status) ? WEXITSTATUS(status)
956 : WTERMSIG(status));
957 break;
958 }
959 reapchild_conn(pid);
960 }
961 }
962
963 void
964 flag_config(int signo __unused)
965 {
966 flag_signal('H');
967 }
968
969 void
970 config(void)
971 {
972 struct servtab *sep, *new, **sepp;
973 long omask;
974 int new_nomapped;
975 #ifdef LOGIN_CAP
976 login_cap_t *lc = NULL;
977 #endif
978
979 if (!setconfig()) {
980 syslog(LOG_ERR, "%s: %m", CONFIG);
981 return;
982 }
983 for (sep = servtab; sep; sep = sep->se_next)
984 sep->se_checked = 0;
985 while ((new = getconfigent())) {
986 if (getpwnam(new->se_user) == NULL) {
987 syslog(LOG_ERR,
988 "%s/%s: no such user '%s', service ignored",
989 new->se_service, new->se_proto, new->se_user);
990 continue;
991 }
992 if (new->se_group && getgrnam(new->se_group) == NULL) {
993 syslog(LOG_ERR,
994 "%s/%s: no such group '%s', service ignored",
995 new->se_service, new->se_proto, new->se_group);
996 continue;
997 }
998 #ifdef LOGIN_CAP
999 if ((lc = login_getclass(new->se_class)) == NULL) {
1000 /* error syslogged by getclass */
1001 syslog(LOG_ERR,
1002 "%s/%s: %s: login class error, service ignored",
1003 new->se_service, new->se_proto, new->se_class);
1004 continue;
1005 }
1006 login_close(lc);
1007 #endif
1008 new_nomapped = new->se_nomapped;
1009 for (sep = servtab; sep; sep = sep->se_next)
1010 if (strcmp(sep->se_service, new->se_service) == 0 &&
1011 strcmp(sep->se_proto, new->se_proto) == 0 &&
1012 sep->se_rpc == new->se_rpc &&
1013 sep->se_socktype == new->se_socktype &&
1014 sep->se_family == new->se_family)
1015 break;
1016 if (sep != 0) {
1017 int i;
1018
1019 #define SWAP(t,a, b) { t c = a; a = b; b = c; }
1020 omask = sigblock(SIGBLOCK);
1021 if (sep->se_nomapped != new->se_nomapped) {
1022 /* for rpc keep old nommaped till unregister */
1023 if (!sep->se_rpc)
1024 sep->se_nomapped = new->se_nomapped;
1025 sep->se_reset = 1;
1026 }
1027 /* copy over outstanding child pids */
1028 if (sep->se_maxchild > 0 && new->se_maxchild > 0) {
1029 new->se_numchild = sep->se_numchild;
1030 if (new->se_numchild > new->se_maxchild)
1031 new->se_numchild = new->se_maxchild;
1032 memcpy(new->se_pids, sep->se_pids,
1033 new->se_numchild * sizeof(*new->se_pids));
1034 }
1035 SWAP(pid_t *, sep->se_pids, new->se_pids);
1036 sep->se_maxchild = new->se_maxchild;
1037 sep->se_numchild = new->se_numchild;
1038 sep->se_maxcpm = new->se_maxcpm;
1039 resize_conn(sep, new->se_maxperip);
1040 sep->se_maxperip = new->se_maxperip;
1041 sep->se_bi = new->se_bi;
1042 /* might need to turn on or off service now */
1043 if (sep->se_fd >= 0) {
1044 if (sep->se_maxchild > 0
1045 && sep->se_numchild == sep->se_maxchild) {
1046 if (FD_ISSET(sep->se_fd, &allsock))
1047 disable(sep);
1048 } else {
1049 if (!FD_ISSET(sep->se_fd, &allsock))
1050 enable(sep);
1051 }
1052 }
1053 sep->se_accept = new->se_accept;
1054 SWAP(char *, sep->se_user, new->se_user);
1055 SWAP(char *, sep->se_group, new->se_group);
1056 #ifdef LOGIN_CAP
1057 SWAP(char *, sep->se_class, new->se_class);
1058 #endif
1059 SWAP(char *, sep->se_server, new->se_server);
1060 SWAP(char *, sep->se_server_name, new->se_server_name);
1061 for (i = 0; i < MAXARGV; i++)
1062 SWAP(char *, sep->se_argv[i], new->se_argv[i]);
1063 #ifdef IPSEC
1064 SWAP(char *, sep->se_policy, new->se_policy);
1065 ipsecsetup(sep);
1066 #endif
1067 sigsetmask(omask);
1068 freeconfig(new);
1069 if (debug)
1070 print_service("REDO", sep);
1071 } else {
1072 sep = enter(new);
1073 if (debug)
1074 print_service("ADD ", sep);
1075 }
1076 sep->se_checked = 1;
1077 if (ISMUX(sep)) {
1078 sep->se_fd = -1;
1079 continue;
1080 }
1081 switch (sep->se_family) {
1082 case AF_INET:
1083 if (!v4bind_ok) {
1084 sep->se_fd = -1;
1085 continue;
1086 }
1087 break;
1088 #ifdef INET6
1089 case AF_INET6:
1090 if (!v6bind_ok) {
1091 sep->se_fd = -1;
1092 continue;
1093 }
1094 break;
1095 #endif
1096 }
1097 if (!sep->se_rpc) {
1098 if (sep->se_family != AF_UNIX) {
1099 sp = getservbyname(sep->se_service, sep->se_proto);
1100 if (sp == 0) {
1101 syslog(LOG_ERR, "%s/%s: unknown service",
1102 sep->se_service, sep->se_proto);
1103 sep->se_checked = 0;
1104 continue;
1105 }
1106 }
1107 switch (sep->se_family) {
1108 case AF_INET:
1109 if (sp->s_port != sep->se_ctrladdr4.sin_port) {
1110 sep->se_ctrladdr4.sin_port =
1111 sp->s_port;
1112 sep->se_reset = 1;
1113 }
1114 break;
1115 #ifdef INET6
1116 case AF_INET6:
1117 if (sp->s_port !=
1118 sep->se_ctrladdr6.sin6_port) {
1119 sep->se_ctrladdr6.sin6_port =
1120 sp->s_port;
1121 sep->se_reset = 1;
1122 }
1123 break;
1124 #endif
1125 }
1126 if (sep->se_reset != 0 && sep->se_fd >= 0)
1127 close_sep(sep);
1128 } else {
1129 rpc = getrpcbyname(sep->se_service);
1130 if (rpc == 0) {
1131 syslog(LOG_ERR, "%s/%s unknown RPC service",
1132 sep->se_service, sep->se_proto);
1133 if (sep->se_fd != -1)
1134 (void) close(sep->se_fd);
1135 sep->se_fd = -1;
1136 continue;
1137 }
1138 if (sep->se_reset != 0 ||
1139 rpc->r_number != sep->se_rpc_prog) {
1140 if (sep->se_rpc_prog)
1141 unregisterrpc(sep);
1142 sep->se_rpc_prog = rpc->r_number;
1143 if (sep->se_fd != -1)
1144 (void) close(sep->se_fd);
1145 sep->se_fd = -1;
1146 }
1147 sep->se_nomapped = new_nomapped;
1148 }
1149 sep->se_reset = 0;
1150 if (sep->se_fd == -1)
1151 setup(sep);
1152 }
1153 endconfig();
1154 /*
1155 * Purge anything not looked at above.
1156 */
1157 omask = sigblock(SIGBLOCK);
1158 sepp = &servtab;
1159 while ((sep = *sepp)) {
1160 if (sep->se_checked) {
1161 sepp = &sep->se_next;
1162 continue;
1163 }
1164 *sepp = sep->se_next;
1165 if (sep->se_fd >= 0)
1166 close_sep(sep);
1167 if (debug)
1168 print_service("FREE", sep);
1169 if (sep->se_rpc && sep->se_rpc_prog > 0)
1170 unregisterrpc(sep);
1171 freeconfig(sep);
1172 free(sep);
1173 }
1174 (void) sigsetmask(omask);
1175 }
1176
1177 void
1178 unregisterrpc(struct servtab *sep)
1179 {
1180 u_int i;
1181 struct servtab *sepp;
1182 long omask;
1183 struct netconfig *netid4, *netid6;
1184
1185 omask = sigblock(SIGBLOCK);
1186 netid4 = sep->se_socktype == SOCK_DGRAM ? udpconf : tcpconf;
1187 netid6 = sep->se_socktype == SOCK_DGRAM ? udp6conf : tcp6conf;
1188 if (sep->se_family == AF_INET)
1189 netid6 = NULL;
1190 else if (sep->se_nomapped)
1191 netid4 = NULL;
1192 /*
1193 * Conflict if same prog and protocol - In that case one should look
1194 * to versions, but it is not interesting: having separate servers for
1195 * different versions does not work well.
1196 * Therefore one do not unregister if there is a conflict.
1197 * There is also transport conflict if destroying INET when INET46
1198 * exists, or destroying INET46 when INET exists
1199 */
1200 for (sepp = servtab; sepp; sepp = sepp->se_next) {
1201 if (sepp == sep)
1202 continue;
1203 if (sepp->se_checked == 0 ||
1204 !sepp->se_rpc ||
1205 strcmp(sep->se_proto, sepp->se_proto) != 0 ||
1206 sep->se_rpc_prog != sepp->se_rpc_prog)
1207 continue;
1208 if (sepp->se_family == AF_INET)
1209 netid4 = NULL;
1210 if (sepp->se_family == AF_INET6) {
1211 netid6 = NULL;
1212 if (!sep->se_nomapped)
1213 netid4 = NULL;
1214 }
1215 if (netid4 == NULL && netid6 == NULL)
1216 return;
1217 }
1218 if (debug)
1219 print_service("UNREG", sep);
1220 for (i = sep->se_rpc_lowvers; i <= sep->se_rpc_highvers; i++) {
1221 if (netid4)
1222 rpcb_unset(sep->se_rpc_prog, i, netid4);
1223 if (netid6)
1224 rpcb_unset(sep->se_rpc_prog, i, netid6);
1225 }
1226 if (sep->se_fd != -1)
1227 (void) close(sep->se_fd);
1228 sep->se_fd = -1;
1229 (void) sigsetmask(omask);
1230 }
1231
1232 void
1233 flag_retry(int signo __unused)
1234 {
1235 flag_signal('A');
1236 }
1237
1238 void
1239 retry(void)
1240 {
1241 struct servtab *sep;
1242
1243 timingout = 0;
1244 for (sep = servtab; sep; sep = sep->se_next)
1245 if (sep->se_fd == -1 && !ISMUX(sep))
1246 setup(sep);
1247 }
1248
1249 void
1250 setup(struct servtab *sep)
1251 {
1252 int on = 1;
1253
1254 /* Set all listening sockets to close-on-exec. */
1255 if ((sep->se_fd = socket(sep->se_family,
1256 sep->se_socktype | SOCK_CLOEXEC, 0)) < 0) {
1257 if (debug)
1258 warn("socket failed on %s/%s",
1259 sep->se_service, sep->se_proto);
1260 syslog(LOG_ERR, "%s/%s: socket: %m",
1261 sep->se_service, sep->se_proto);
1262 return;
1263 }
1264 #define turnon(fd, opt) \
1265 setsockopt(fd, SOL_SOCKET, opt, (char *)&on, sizeof (on))
1266 if (strcmp(sep->se_proto, "tcp") == 0 && (options & SO_DEBUG) &&
1267 turnon(sep->se_fd, SO_DEBUG) < 0)
1268 syslog(LOG_ERR, "setsockopt (SO_DEBUG): %m");
1269 if (turnon(sep->se_fd, SO_REUSEADDR) < 0)
1270 syslog(LOG_ERR, "setsockopt (SO_REUSEADDR): %m");
1271 #ifdef SO_PRIVSTATE
1272 if (turnon(sep->se_fd, SO_PRIVSTATE) < 0)
1273 syslog(LOG_ERR, "setsockopt (SO_PRIVSTATE): %m");
1274 #endif
1275 /* tftpd opens a new connection then needs more infos */
1276 if ((sep->se_family == AF_INET6) &&
1277 (strcmp(sep->se_proto, "udp") == 0) &&
1278 (sep->se_accept == 0) &&
1279 (setsockopt(sep->se_fd, IPPROTO_IPV6, IPV6_RECVPKTINFO,
1280 (char *)&on, sizeof (on)) < 0))
1281 syslog(LOG_ERR, "setsockopt (IPV6_RECVPKTINFO): %m");
1282 if (sep->se_family == AF_INET6) {
1283 int flag = sep->se_nomapped ? 1 : 0;
1284 if (setsockopt(sep->se_fd, IPPROTO_IPV6, IPV6_V6ONLY,
1285 (char *)&flag, sizeof (flag)) < 0)
1286 syslog(LOG_ERR, "setsockopt (IPV6_V6ONLY): %m");
1287 }
1288 #undef turnon
1289 #ifdef IPSEC
1290 ipsecsetup(sep);
1291 #endif
1292 if (sep->se_family == AF_UNIX) {
1293 (void) unlink(sep->se_ctrladdr_un.sun_path);
1294 umask(0777); /* Make socket with conservative permissions */
1295 }
1296 if (bind(sep->se_fd, (struct sockaddr *)&sep->se_ctrladdr,
1297 sep->se_ctrladdr_size) < 0) {
1298 if (debug)
1299 warn("bind failed on %s/%s",
1300 sep->se_service, sep->se_proto);
1301 syslog(LOG_ERR, "%s/%s: bind: %m",
1302 sep->se_service, sep->se_proto);
1303 (void) close(sep->se_fd);
1304 sep->se_fd = -1;
1305 if (!timingout) {
1306 timingout = 1;
1307 alarm(RETRYTIME);
1308 }
1309 if (sep->se_family == AF_UNIX)
1310 umask(mask);
1311 return;
1312 }
1313 if (sep->se_family == AF_UNIX) {
1314 /* Ick - fch{own,mod} don't work on Unix domain sockets */
1315 if (chown(sep->se_service, sep->se_sockuid, sep->se_sockgid) < 0)
1316 syslog(LOG_ERR, "chown socket: %m");
1317 if (chmod(sep->se_service, sep->se_sockmode) < 0)
1318 syslog(LOG_ERR, "chmod socket: %m");
1319 umask(mask);
1320 }
1321 if (sep->se_rpc) {
1322 u_int i;
1323 socklen_t len = sep->se_ctrladdr_size;
1324 struct netconfig *netid, *netid2 = NULL;
1325 struct sockaddr_in sock;
1326 struct netbuf nbuf, nbuf2;
1327
1328 if (getsockname(sep->se_fd,
1329 (struct sockaddr*)&sep->se_ctrladdr, &len) < 0){
1330 syslog(LOG_ERR, "%s/%s: getsockname: %m",
1331 sep->se_service, sep->se_proto);
1332 (void) close(sep->se_fd);
1333 sep->se_fd = -1;
1334 return;
1335 }
1336 nbuf.buf = &sep->se_ctrladdr;
1337 nbuf.len = sep->se_ctrladdr.sa_len;
1338 if (sep->se_family == AF_INET)
1339 netid = sep->se_socktype==SOCK_DGRAM? udpconf:tcpconf;
1340 else {
1341 netid = sep->se_socktype==SOCK_DGRAM? udp6conf:tcp6conf;
1342 if (!sep->se_nomapped) { /* INET and INET6 */
1343 netid2 = netid==udp6conf? udpconf:tcpconf;
1344 memset(&sock, 0, sizeof sock); /* ADDR_ANY */
1345 nbuf2.buf = &sock;
1346 nbuf2.len = sock.sin_len = sizeof sock;
1347 sock.sin_family = AF_INET;
1348 sock.sin_port = sep->se_ctrladdr6.sin6_port;
1349 }
1350 }
1351 if (debug)
1352 print_service("REG ", sep);
1353 for (i = sep->se_rpc_lowvers; i <= sep->se_rpc_highvers; i++) {
1354 rpcb_unset(sep->se_rpc_prog, i, netid);
1355 rpcb_set(sep->se_rpc_prog, i, netid, &nbuf);
1356 if (netid2) {
1357 rpcb_unset(sep->se_rpc_prog, i, netid2);
1358 rpcb_set(sep->se_rpc_prog, i, netid2, &nbuf2);
1359 }
1360 }
1361 }
1362 if (sep->se_socktype == SOCK_STREAM)
1363 listen(sep->se_fd, -1);
1364 enable(sep);
1365 if (debug) {
1366 warnx("registered %s on %d",
1367 sep->se_server, sep->se_fd);
1368 }
1369 }
1370
1371 #ifdef IPSEC
1372 void
1373 ipsecsetup(struct servtab *sep)
1374 {
1375 char *buf;
1376 char *policy_in = NULL;
1377 char *policy_out = NULL;
1378 int level;
1379 int opt;
1380
1381 switch (sep->se_family) {
1382 case AF_INET:
1383 level = IPPROTO_IP;
1384 opt = IP_IPSEC_POLICY;
1385 break;
1386 #ifdef INET6
1387 case AF_INET6:
1388 level = IPPROTO_IPV6;
1389 opt = IPV6_IPSEC_POLICY;
1390 break;
1391 #endif
1392 default:
1393 return;
1394 }
1395
1396 if (!sep->se_policy || sep->se_policy[0] == '\0') {
1397 static char def_in[] = "in entrust", def_out[] = "out entrust";
1398 policy_in = def_in;
1399 policy_out = def_out;
1400 } else {
1401 if (!strncmp("in", sep->se_policy, 2))
1402 policy_in = sep->se_policy;
1403 else if (!strncmp("out", sep->se_policy, 3))
1404 policy_out = sep->se_policy;
1405 else {
1406 syslog(LOG_ERR, "invalid security policy \"%s\"",
1407 sep->se_policy);
1408 return;
1409 }
1410 }
1411
1412 if (policy_in != NULL) {
1413 buf = ipsec_set_policy(policy_in, strlen(policy_in));
1414 if (buf != NULL) {
1415 if (setsockopt(sep->se_fd, level, opt,
1416 buf, ipsec_get_policylen(buf)) < 0 &&
1417 debug != 0)
1418 warnx("%s/%s: ipsec initialization failed; %s",
1419 sep->se_service, sep->se_proto,
1420 policy_in);
1421 free(buf);
1422 } else
1423 syslog(LOG_ERR, "invalid security policy \"%s\"",
1424 policy_in);
1425 }
1426 if (policy_out != NULL) {
1427 buf = ipsec_set_policy(policy_out, strlen(policy_out));
1428 if (buf != NULL) {
1429 if (setsockopt(sep->se_fd, level, opt,
1430 buf, ipsec_get_policylen(buf)) < 0 &&
1431 debug != 0)
1432 warnx("%s/%s: ipsec initialization failed; %s",
1433 sep->se_service, sep->se_proto,
1434 policy_out);
1435 free(buf);
1436 } else
1437 syslog(LOG_ERR, "invalid security policy \"%s\"",
1438 policy_out);
1439 }
1440 }
1441 #endif
1442
1443 /*
1444 * Finish with a service and its socket.
1445 */
1446 void
1447 close_sep(struct servtab *sep)
1448 {
1449 if (sep->se_fd >= 0) {
1450 if (FD_ISSET(sep->se_fd, &allsock))
1451 disable(sep);
1452 (void) close(sep->se_fd);
1453 sep->se_fd = -1;
1454 }
1455 sep->se_count = 0;
1456 sep->se_numchild = 0; /* forget about any existing children */
1457 }
1458
1459 int
1460 matchservent(const char *name1, const char *name2, const char *proto)
1461 {
1462 char **alias, *p;
1463 struct servent *se;
1464
1465 if (strcmp(proto, "unix") == 0) {
1466 if ((p = strrchr(name1, '/')) != NULL)
1467 name1 = p + 1;
1468 if ((p = strrchr(name2, '/')) != NULL)
1469 name2 = p + 1;
1470 }
1471 if (strcmp(name1, name2) == 0)
1472 return(1);
1473 if ((se = getservbyname(name1, proto)) != NULL) {
1474 if (strcmp(name2, se->s_name) == 0)
1475 return(1);
1476 for (alias = se->s_aliases; *alias; alias++)
1477 if (strcmp(name2, *alias) == 0)
1478 return(1);
1479 }
1480 return(0);
1481 }
1482
1483 struct servtab *
1484 enter(struct servtab *cp)
1485 {
1486 struct servtab *sep;
1487 long omask;
1488
1489 sep = (struct servtab *)malloc(sizeof (*sep));
1490 if (sep == (struct servtab *)0) {
1491 syslog(LOG_ERR, "malloc: %m");
1492 exit(EX_OSERR);
1493 }
1494 *sep = *cp;
1495 sep->se_fd = -1;
1496 omask = sigblock(SIGBLOCK);
1497 sep->se_next = servtab;
1498 servtab = sep;
1499 sigsetmask(omask);
1500 return (sep);
1501 }
1502
1503 void
1504 enable(struct servtab *sep)
1505 {
1506 if (debug)
1507 warnx(
1508 "enabling %s, fd %d", sep->se_service, sep->se_fd);
1509 #ifdef SANITY_CHECK
1510 if (sep->se_fd < 0) {
1511 syslog(LOG_ERR,
1512 "%s: %s: bad fd", __func__, sep->se_service);
1513 exit(EX_SOFTWARE);
1514 }
1515 if (ISMUX(sep)) {
1516 syslog(LOG_ERR,
1517 "%s: %s: is mux", __func__, sep->se_service);
1518 exit(EX_SOFTWARE);
1519 }
1520 if (FD_ISSET(sep->se_fd, &allsock)) {
1521 syslog(LOG_ERR,
1522 "%s: %s: not off", __func__, sep->se_service);
1523 exit(EX_SOFTWARE);
1524 }
1525 nsock++;
1526 #endif
1527 FD_SET(sep->se_fd, &allsock);
1528 if (sep->se_fd > maxsock)
1529 maxsock = sep->se_fd;
1530 }
1531
1532 void
1533 disable(struct servtab *sep)
1534 {
1535 if (debug)
1536 warnx(
1537 "disabling %s, fd %d", sep->se_service, sep->se_fd);
1538 #ifdef SANITY_CHECK
1539 if (sep->se_fd < 0) {
1540 syslog(LOG_ERR,
1541 "%s: %s: bad fd", __func__, sep->se_service);
1542 exit(EX_SOFTWARE);
1543 }
1544 if (ISMUX(sep)) {
1545 syslog(LOG_ERR,
1546 "%s: %s: is mux", __func__, sep->se_service);
1547 exit(EX_SOFTWARE);
1548 }
1549 if (!FD_ISSET(sep->se_fd, &allsock)) {
1550 syslog(LOG_ERR,
1551 "%s: %s: not on", __func__, sep->se_service);
1552 exit(EX_SOFTWARE);
1553 }
1554 if (nsock == 0) {
1555 syslog(LOG_ERR, "%s: nsock=0", __func__);
1556 exit(EX_SOFTWARE);
1557 }
1558 nsock--;
1559 #endif
1560 FD_CLR(sep->se_fd, &allsock);
1561 if (sep->se_fd == maxsock)
1562 maxsock--;
1563 }
1564
1565 FILE *fconfig = NULL;
1566 struct servtab serv;
1567 char line[LINE_MAX];
1568
1569 int
1570 setconfig(void)
1571 {
1572
1573 if (fconfig != NULL) {
1574 fseek(fconfig, 0L, SEEK_SET);
1575 return (1);
1576 }
1577 fconfig = fopen(CONFIG, "r");
1578 return (fconfig != NULL);
1579 }
1580
1581 void
1582 endconfig(void)
1583 {
1584 if (fconfig) {
1585 (void) fclose(fconfig);
1586 fconfig = NULL;
1587 }
1588 }
1589
1590 struct servtab *
1591 getconfigent(void)
1592 {
1593 struct servtab *sep = &serv;
1594 int argc;
1595 char *cp, *arg, *s;
1596 char *versp;
1597 static char TCPMUX_TOKEN[] = "tcpmux/";
1598 #define MUX_LEN (sizeof(TCPMUX_TOKEN)-1)
1599 #ifdef IPSEC
1600 char *policy;
1601 #endif
1602 int v4bind;
1603 #ifdef INET6
1604 int v6bind;
1605 #endif
1606 int i;
1607
1608 #ifdef IPSEC
1609 policy = NULL;
1610 #endif
1611 more:
1612 v4bind = 0;
1613 #ifdef INET6
1614 v6bind = 0;
1615 #endif
1616 while ((cp = nextline(fconfig)) != NULL) {
1617 #ifdef IPSEC
1618 /* lines starting with #@ is not a comment, but the policy */
1619 if (cp[0] == '#' && cp[1] == '@') {
1620 char *p;
1621 for (p = cp + 2; p && *p && isspace(*p); p++)
1622 ;
1623 if (*p == '\0') {
1624 if (policy)
1625 free(policy);
1626 policy = NULL;
1627 } else if (ipsec_get_policylen(p) >= 0) {
1628 if (policy)
1629 free(policy);
1630 policy = newstr(p);
1631 } else {
1632 syslog(LOG_ERR,
1633 "%s: invalid ipsec policy \"%s\"",
1634 CONFIG, p);
1635 exit(EX_CONFIG);
1636 }
1637 }
1638 #endif
1639 if (*cp == '#' || *cp == '\0')
1640 continue;
1641 break;
1642 }
1643 if (cp == NULL)
1644 return ((struct servtab *)0);
1645 /*
1646 * clear the static buffer, since some fields (se_ctrladdr,
1647 * for example) don't get initialized here.
1648 */
1649 memset(sep, 0, sizeof *sep);
1650 arg = skip(&cp);
1651 if (cp == NULL) {
1652 /* got an empty line containing just blanks/tabs. */
1653 goto more;
1654 }
1655 if (arg[0] == ':') { /* :user:group:perm: */
1656 char *user, *group, *perm;
1657 struct passwd *pw;
1658 struct group *gr;
1659 user = arg+1;
1660 if ((group = strchr(user, ':')) == NULL) {
1661 syslog(LOG_ERR, "no group after user '%s'", user);
1662 goto more;
1663 }
1664 *group++ = '\0';
1665 if ((perm = strchr(group, ':')) == NULL) {
1666 syslog(LOG_ERR, "no mode after group '%s'", group);
1667 goto more;
1668 }
1669 *perm++ = '\0';
1670 if ((pw = getpwnam(user)) == NULL) {
1671 syslog(LOG_ERR, "no such user '%s'", user);
1672 goto more;
1673 }
1674 sep->se_sockuid = pw->pw_uid;
1675 if ((gr = getgrnam(group)) == NULL) {
1676 syslog(LOG_ERR, "no such user '%s'", group);
1677 goto more;
1678 }
1679 sep->se_sockgid = gr->gr_gid;
1680 sep->se_sockmode = strtol(perm, &arg, 8);
1681 if (*arg != ':') {
1682 syslog(LOG_ERR, "bad mode '%s'", perm);
1683 goto more;
1684 }
1685 *arg++ = '\0';
1686 } else {
1687 sep->se_sockuid = euid;
1688 sep->se_sockgid = egid;
1689 sep->se_sockmode = 0200;
1690 }
1691 if (strncmp(arg, TCPMUX_TOKEN, MUX_LEN) == 0) {
1692 char *c = arg + MUX_LEN;
1693 if (*c == '+') {
1694 sep->se_type = MUXPLUS_TYPE;
1695 c++;
1696 } else
1697 sep->se_type = MUX_TYPE;
1698 sep->se_service = newstr(c);
1699 } else {
1700 sep->se_service = newstr(arg);
1701 sep->se_type = NORM_TYPE;
1702 }
1703 arg = sskip(&cp);
1704 if (strcmp(arg, "stream") == 0)
1705 sep->se_socktype = SOCK_STREAM;
1706 else if (strcmp(arg, "dgram") == 0)
1707 sep->se_socktype = SOCK_DGRAM;
1708 else if (strcmp(arg, "rdm") == 0)
1709 sep->se_socktype = SOCK_RDM;
1710 else if (strcmp(arg, "seqpacket") == 0)
1711 sep->se_socktype = SOCK_SEQPACKET;
1712 else if (strcmp(arg, "raw") == 0)
1713 sep->se_socktype = SOCK_RAW;
1714 else
1715 sep->se_socktype = -1;
1716
1717 arg = sskip(&cp);
1718 if (strncmp(arg, "tcp", 3) == 0) {
1719 sep->se_proto = newstr(strsep(&arg, "/"));
1720 if (arg != NULL && (strcmp(arg, "faith") == 0)) {
1721 syslog(LOG_ERR, "faith has been deprecated");
1722 goto more;
1723 }
1724 } else {
1725 if (sep->se_type == NORM_TYPE &&
1726 strncmp(arg, "faith/", 6) == 0) {
1727 syslog(LOG_ERR, "faith has been deprecated");
1728 goto more;
1729 }
1730 sep->se_proto = newstr(arg);
1731 }
1732 if (strncmp(sep->se_proto, "rpc/", 4) == 0) {
1733 memmove(sep->se_proto, sep->se_proto + 4,
1734 strlen(sep->se_proto) + 1 - 4);
1735 sep->se_rpc = 1;
1736 sep->se_rpc_prog = sep->se_rpc_lowvers =
1737 sep->se_rpc_highvers = 0;
1738 if ((versp = strrchr(sep->se_service, '/'))) {
1739 *versp++ = '\0';
1740 switch (sscanf(versp, "%u-%u",
1741 &sep->se_rpc_lowvers,
1742 &sep->se_rpc_highvers)) {
1743 case 2:
1744 break;
1745 case 1:
1746 sep->se_rpc_highvers =
1747 sep->se_rpc_lowvers;
1748 break;
1749 default:
1750 syslog(LOG_ERR,
1751 "bad RPC version specifier; %s",
1752 sep->se_service);
1753 freeconfig(sep);
1754 goto more;
1755 }
1756 }
1757 else {
1758 sep->se_rpc_lowvers =
1759 sep->se_rpc_highvers = 1;
1760 }
1761 }
1762 sep->se_nomapped = 0;
1763 if (strcmp(sep->se_proto, "unix") == 0) {
1764 sep->se_family = AF_UNIX;
1765 } else {
1766 while (isdigit(sep->se_proto[strlen(sep->se_proto) - 1])) {
1767 #ifdef INET6
1768 if (sep->se_proto[strlen(sep->se_proto) - 1] == '6') {
1769 sep->se_proto[strlen(sep->se_proto) - 1] = '\0';
1770 v6bind = 1;
1771 continue;
1772 }
1773 #endif
1774 if (sep->se_proto[strlen(sep->se_proto) - 1] == '4') {
1775 sep->se_proto[strlen(sep->se_proto) - 1] = '\0';
1776 v4bind = 1;
1777 continue;
1778 }
1779 /* illegal version num */
1780 syslog(LOG_ERR, "bad IP version for %s", sep->se_proto);
1781 freeconfig(sep);
1782 goto more;
1783 }
1784 #ifdef INET6
1785 if (v6bind && !v6bind_ok) {
1786 syslog(LOG_INFO, "IPv6 bind is ignored for %s",
1787 sep->se_service);
1788 if (v4bind && v4bind_ok)
1789 v6bind = 0;
1790 else {
1791 freeconfig(sep);
1792 goto more;
1793 }
1794 }
1795 if (v6bind) {
1796 sep->se_family = AF_INET6;
1797 if (!v4bind || !v4bind_ok)
1798 sep->se_nomapped = 1;
1799 } else
1800 #endif
1801 { /* default to v4 bind if not v6 bind */
1802 if (!v4bind_ok) {
1803 syslog(LOG_NOTICE, "IPv4 bind is ignored for %s",
1804 sep->se_service);
1805 freeconfig(sep);
1806 goto more;
1807 }
1808 sep->se_family = AF_INET;
1809 }
1810 }
1811 /* init ctladdr */
1812 switch(sep->se_family) {
1813 case AF_INET:
1814 memcpy(&sep->se_ctrladdr4, bind_sa4,
1815 sizeof(sep->se_ctrladdr4));
1816 sep->se_ctrladdr_size = sizeof(sep->se_ctrladdr4);
1817 break;
1818 #ifdef INET6
1819 case AF_INET6:
1820 memcpy(&sep->se_ctrladdr6, bind_sa6,
1821 sizeof(sep->se_ctrladdr6));
1822 sep->se_ctrladdr_size = sizeof(sep->se_ctrladdr6);
1823 break;
1824 #endif
1825 case AF_UNIX:
1826 if (strlen(sep->se_service) >= sizeof(sep->se_ctrladdr_un.sun_path)) {
1827 syslog(LOG_ERR,
1828 "domain socket pathname too long for service %s",
1829 sep->se_service);
1830 goto more;
1831 }
1832 memset(&sep->se_ctrladdr, 0, sizeof(sep->se_ctrladdr));
1833 sep->se_ctrladdr_un.sun_family = sep->se_family;
1834 sep->se_ctrladdr_un.sun_len = strlen(sep->se_service);
1835 strcpy(sep->se_ctrladdr_un.sun_path, sep->se_service);
1836 sep->se_ctrladdr_size = SUN_LEN(&sep->se_ctrladdr_un);
1837 }
1838 arg = sskip(&cp);
1839 if (!strncmp(arg, "wait", 4))
1840 sep->se_accept = 0;
1841 else if (!strncmp(arg, "nowait", 6))
1842 sep->se_accept = 1;
1843 else {
1844 syslog(LOG_ERR,
1845 "%s: bad wait/nowait for service %s",
1846 CONFIG, sep->se_service);
1847 goto more;
1848 }
1849 sep->se_maxchild = -1;
1850 sep->se_maxcpm = -1;
1851 sep->se_maxperip = -1;
1852 if ((s = strchr(arg, '/')) != NULL) {
1853 char *eptr;
1854 u_long val;
1855
1856 val = strtoul(s + 1, &eptr, 10);
1857 if (eptr == s + 1 || val > MAX_MAXCHLD) {
1858 syslog(LOG_ERR,
1859 "%s: bad max-child for service %s",
1860 CONFIG, sep->se_service);
1861 goto more;
1862 }
1863 if (debug)
1864 if (!sep->se_accept && val != 1)
1865 warnx("maxchild=%lu for wait service %s"
1866 " not recommended", val, sep->se_service);
1867 sep->se_maxchild = val;
1868 if (*eptr == '/')
1869 sep->se_maxcpm = strtol(eptr + 1, &eptr, 10);
1870 if (*eptr == '/')
1871 sep->se_maxperip = strtol(eptr + 1, &eptr, 10);
1872 /*
1873 * explicitly do not check for \0 for future expansion /
1874 * backwards compatibility
1875 */
1876 }
1877 if (ISMUX(sep)) {
1878 /*
1879 * Silently enforce "nowait" mode for TCPMUX services
1880 * since they don't have an assigned port to listen on.
1881 */
1882 sep->se_accept = 1;
1883 if (strcmp(sep->se_proto, "tcp")) {
1884 syslog(LOG_ERR,
1885 "%s: bad protocol for tcpmux service %s",
1886 CONFIG, sep->se_service);
1887 goto more;
1888 }
1889 if (sep->se_socktype != SOCK_STREAM) {
1890 syslog(LOG_ERR,
1891 "%s: bad socket type for tcpmux service %s",
1892 CONFIG, sep->se_service);
1893 goto more;
1894 }
1895 }
1896 sep->se_user = newstr(sskip(&cp));
1897 #ifdef LOGIN_CAP
1898 if ((s = strrchr(sep->se_user, '/')) != NULL) {
1899 *s = '\0';
1900 sep->se_class = newstr(s + 1);
1901 } else
1902 sep->se_class = newstr(RESOURCE_RC);
1903 #endif
1904 if ((s = strrchr(sep->se_user, ':')) != NULL) {
1905 *s = '\0';
1906 sep->se_group = newstr(s + 1);
1907 } else
1908 sep->se_group = NULL;
1909 sep->se_server = newstr(sskip(&cp));
1910 if ((sep->se_server_name = strrchr(sep->se_server, '/')))
1911 sep->se_server_name++;
1912 if (strcmp(sep->se_server, "internal") == 0) {
1913 struct biltin *bi;
1914
1915 for (bi = biltins; bi->bi_service; bi++)
1916 if (bi->bi_socktype == sep->se_socktype &&
1917 matchservent(bi->bi_service, sep->se_service,
1918 sep->se_proto))
1919 break;
1920 if (bi->bi_service == 0) {
1921 syslog(LOG_ERR, "internal service %s unknown",
1922 sep->se_service);
1923 goto more;
1924 }
1925 sep->se_accept = 1; /* force accept mode for built-ins */
1926 sep->se_bi = bi;
1927 } else
1928 sep->se_bi = NULL;
1929 if (sep->se_maxperip < 0)
1930 sep->se_maxperip = maxperip;
1931 if (sep->se_maxcpm < 0)
1932 sep->se_maxcpm = maxcpm;
1933 if (sep->se_maxchild < 0) { /* apply default max-children */
1934 if (sep->se_bi && sep->se_bi->bi_maxchild >= 0)
1935 sep->se_maxchild = sep->se_bi->bi_maxchild;
1936 else if (sep->se_accept)
1937 sep->se_maxchild = MAX(maxchild, 0);
1938 else
1939 sep->se_maxchild = 1;
1940 }
1941 if (sep->se_maxchild > 0) {
1942 sep->se_pids = malloc(sep->se_maxchild * sizeof(*sep->se_pids));
1943 if (sep->se_pids == NULL) {
1944 syslog(LOG_ERR, "malloc: %m");
1945 exit(EX_OSERR);
1946 }
1947 }
1948 argc = 0;
1949 for (arg = skip(&cp); cp; arg = skip(&cp))
1950 if (argc < MAXARGV) {
1951 sep->se_argv[argc++] = newstr(arg);
1952 } else {
1953 syslog(LOG_ERR,
1954 "%s: too many arguments for service %s",
1955 CONFIG, sep->se_service);
1956 goto more;
1957 }
1958 while (argc <= MAXARGV)
1959 sep->se_argv[argc++] = NULL;
1960 for (i = 0; i < PERIPSIZE; ++i)
1961 LIST_INIT(&sep->se_conn[i]);
1962 #ifdef IPSEC
1963 sep->se_policy = policy ? newstr(policy) : NULL;
1964 #endif
1965 return (sep);
1966 }
1967
1968 void
1969 freeconfig(struct servtab *cp)
1970 {
1971 int i;
1972
1973 if (cp->se_service)
1974 free(cp->se_service);
1975 if (cp->se_proto)
1976 free(cp->se_proto);
1977 if (cp->se_user)
1978 free(cp->se_user);
1979 if (cp->se_group)
1980 free(cp->se_group);
1981 #ifdef LOGIN_CAP
1982 if (cp->se_class)
1983 free(cp->se_class);
1984 #endif
1985 if (cp->se_server)
1986 free(cp->se_server);
1987 if (cp->se_pids)
1988 free(cp->se_pids);
1989 for (i = 0; i < MAXARGV; i++)
1990 if (cp->se_argv[i])
1991 free(cp->se_argv[i]);
1992 free_connlist(cp);
1993 #ifdef IPSEC
1994 if (cp->se_policy)
1995 free(cp->se_policy);
1996 #endif
1997 }
1998
1999
2000 /*
2001 * Safe skip - if skip returns null, log a syntax error in the
2002 * configuration file and exit.
2003 */
2004 char *
2005 sskip(char **cpp)
2006 {
2007 char *cp;
2008
2009 cp = skip(cpp);
2010 if (cp == NULL) {
2011 syslog(LOG_ERR, "%s: syntax error", CONFIG);
2012 exit(EX_DATAERR);
2013 }
2014 return (cp);
2015 }
2016
2017 char *
2018 skip(char **cpp)
2019 {
2020 char *cp = *cpp;
2021 char *start;
2022 char quote = '\0';
2023
2024 again:
2025 while (*cp == ' ' || *cp == '\t')
2026 cp++;
2027 if (*cp == '\0') {
2028 int c;
2029
2030 c = getc(fconfig);
2031 (void) ungetc(c, fconfig);
2032 if (c == ' ' || c == '\t')
2033 if ((cp = nextline(fconfig)))
2034 goto again;
2035 *cpp = (char *)0;
2036 return ((char *)0);
2037 }
2038 if (*cp == '"' || *cp == '\'')
2039 quote = *cp++;
2040 start = cp;
2041 if (quote)
2042 while (*cp && *cp != quote)
2043 cp++;
2044 else
2045 while (*cp && *cp != ' ' && *cp != '\t')
2046 cp++;
2047 if (*cp != '\0')
2048 *cp++ = '\0';
2049 *cpp = cp;
2050 return (start);
2051 }
2052
2053 char *
2054 nextline(FILE *fd)
2055 {
2056 char *cp;
2057
2058 if (fgets(line, sizeof (line), fd) == NULL)
2059 return ((char *)0);
2060 cp = strchr(line, '\n');
2061 if (cp)
2062 *cp = '\0';
2063 return (line);
2064 }
2065
2066 char *
2067 newstr(const char *cp)
2068 {
2069 char *cr;
2070
2071 if ((cr = strdup(cp != NULL ? cp : "")))
2072 return (cr);
2073 syslog(LOG_ERR, "strdup: %m");
2074 exit(EX_OSERR);
2075 }
2076
2077 void
2078 inetd_setproctitle(const char *a, int s)
2079 {
2080 socklen_t size;
2081 struct sockaddr_storage ss;
2082 char buf[80], pbuf[NI_MAXHOST];
2083
2084 size = sizeof(ss);
2085 if (getpeername(s, (struct sockaddr *)&ss, &size) == 0) {
2086 getnameinfo((struct sockaddr *)&ss, size, pbuf, sizeof(pbuf),
2087 NULL, 0, NI_NUMERICHOST);
2088 (void) sprintf(buf, "%s [%s]", a, pbuf);
2089 } else
2090 (void) sprintf(buf, "%s", a);
2091 setproctitle("%s", buf);
2092 }
2093
2094 int
2095 check_loop(const struct sockaddr *sa, const struct servtab *sep)
2096 {
2097 struct servtab *se2;
2098 char pname[NI_MAXHOST];
2099
2100 for (se2 = servtab; se2; se2 = se2->se_next) {
2101 if (!se2->se_bi || se2->se_socktype != SOCK_DGRAM)
2102 continue;
2103
2104 switch (se2->se_family) {
2105 case AF_INET:
2106 if (((const struct sockaddr_in *)sa)->sin_port ==
2107 se2->se_ctrladdr4.sin_port)
2108 goto isloop;
2109 continue;
2110 #ifdef INET6
2111 case AF_INET6:
2112 if (((const struct sockaddr_in6 *)sa)->sin6_port ==
2113 se2->se_ctrladdr6.sin6_port)
2114 goto isloop;
2115 continue;
2116 #endif
2117 default:
2118 continue;
2119 }
2120 isloop:
2121 getnameinfo(sa, sa->sa_len, pname, sizeof(pname), NULL, 0,
2122 NI_NUMERICHOST);
2123 syslog(LOG_WARNING, "%s/%s:%s/%s loop request REFUSED from %s",
2124 sep->se_service, sep->se_proto,
2125 se2->se_service, se2->se_proto,
2126 pname);
2127 return 1;
2128 }
2129 return 0;
2130 }
2131
2132 /*
2133 * print_service:
2134 * Dump relevant information to stderr
2135 */
2136 void
2137 print_service(const char *action, const struct servtab *sep)
2138 {
2139 fprintf(stderr,
2140 "%s: %s proto=%s accept=%d max=%d user=%s group=%s"
2141 #ifdef LOGIN_CAP
2142 "class=%s"
2143 #endif
2144 " builtin=%p server=%s"
2145 #ifdef IPSEC
2146 " policy=\"%s\""
2147 #endif
2148 "\n",
2149 action, sep->se_service, sep->se_proto,
2150 sep->se_accept, sep->se_maxchild, sep->se_user, sep->se_group,
2151 #ifdef LOGIN_CAP
2152 sep->se_class,
2153 #endif
2154 (void *) sep->se_bi, sep->se_server
2155 #ifdef IPSEC
2156 , (sep->se_policy ? sep->se_policy : "")
2157 #endif
2158 );
2159 }
2160
2161 #define CPMHSIZE 256
2162 #define CPMHMASK (CPMHSIZE-1)
2163 #define CHTGRAN 10
2164 #define CHTSIZE 6
2165
2166 typedef struct CTime {
2167 unsigned long ct_Ticks;
2168 int ct_Count;
2169 } CTime;
2170
2171 typedef struct CHash {
2172 union {
2173 struct in_addr c4_Addr;
2174 struct in6_addr c6_Addr;
2175 } cu_Addr;
2176 #define ch_Addr4 cu_Addr.c4_Addr
2177 #define ch_Addr6 cu_Addr.c6_Addr
2178 int ch_Family;
2179 time_t ch_LTime;
2180 char *ch_Service;
2181 CTime ch_Times[CHTSIZE];
2182 } CHash;
2183
2184 CHash CHashAry[CPMHSIZE];
2185
2186 int
2187 cpmip(const struct servtab *sep, int ctrl)
2188 {
2189 struct sockaddr_storage rss;
2190 socklen_t rssLen = sizeof(rss);
2191 int r = 0;
2192
2193 /*
2194 * If getpeername() fails, just let it through (if logging is
2195 * enabled the condition is caught elsewhere)
2196 */
2197
2198 if (sep->se_maxcpm > 0 &&
2199 (sep->se_family == AF_INET || sep->se_family == AF_INET6) &&
2200 getpeername(ctrl, (struct sockaddr *)&rss, &rssLen) == 0 ) {
2201 time_t t = time(NULL);
2202 int hv = 0xABC3D20F;
2203 int i;
2204 int cnt = 0;
2205 CHash *chBest = NULL;
2206 unsigned int ticks = t / CHTGRAN;
2207 struct sockaddr_in *sin4;
2208 #ifdef INET6
2209 struct sockaddr_in6 *sin6;
2210 #endif
2211
2212 sin4 = (struct sockaddr_in *)&rss;
2213 #ifdef INET6
2214 sin6 = (struct sockaddr_in6 *)&rss;
2215 #endif
2216 {
2217 char *p;
2218 int addrlen;
2219
2220 switch (rss.ss_family) {
2221 case AF_INET:
2222 p = (char *)&sin4->sin_addr;
2223 addrlen = sizeof(struct in_addr);
2224 break;
2225 #ifdef INET6
2226 case AF_INET6:
2227 p = (char *)&sin6->sin6_addr;
2228 addrlen = sizeof(struct in6_addr);
2229 break;
2230 #endif
2231 default:
2232 /* should not happen */
2233 return -1;
2234 }
2235
2236 for (i = 0; i < addrlen; ++i, ++p) {
2237 hv = (hv << 5) ^ (hv >> 23) ^ *p;
2238 }
2239 hv = (hv ^ (hv >> 16));
2240 }
2241 for (i = 0; i < 5; ++i) {
2242 CHash *ch = &CHashAry[(hv + i) & CPMHMASK];
2243
2244 if (rss.ss_family == AF_INET &&
2245 ch->ch_Family == AF_INET &&
2246 sin4->sin_addr.s_addr == ch->ch_Addr4.s_addr &&
2247 ch->ch_Service && strcmp(sep->se_service,
2248 ch->ch_Service) == 0) {
2249 chBest = ch;
2250 break;
2251 }
2252 #ifdef INET6
2253 if (rss.ss_family == AF_INET6 &&
2254 ch->ch_Family == AF_INET6 &&
2255 IN6_ARE_ADDR_EQUAL(&sin6->sin6_addr,
2256 &ch->ch_Addr6) != 0 &&
2257 ch->ch_Service && strcmp(sep->se_service,
2258 ch->ch_Service) == 0) {
2259 chBest = ch;
2260 break;
2261 }
2262 #endif
2263 if (chBest == NULL || ch->ch_LTime == 0 ||
2264 ch->ch_LTime < chBest->ch_LTime) {
2265 chBest = ch;
2266 }
2267 }
2268 if ((rss.ss_family == AF_INET &&
2269 (chBest->ch_Family != AF_INET ||
2270 sin4->sin_addr.s_addr != chBest->ch_Addr4.s_addr)) ||
2271 chBest->ch_Service == NULL ||
2272 strcmp(sep->se_service, chBest->ch_Service) != 0) {
2273 chBest->ch_Family = sin4->sin_family;
2274 chBest->ch_Addr4 = sin4->sin_addr;
2275 if (chBest->ch_Service)
2276 free(chBest->ch_Service);
2277 chBest->ch_Service = strdup(sep->se_service);
2278 bzero(chBest->ch_Times, sizeof(chBest->ch_Times));
2279 }
2280 #ifdef INET6
2281 if ((rss.ss_family == AF_INET6 &&
2282 (chBest->ch_Family != AF_INET6 ||
2283 IN6_ARE_ADDR_EQUAL(&sin6->sin6_addr,
2284 &chBest->ch_Addr6) == 0)) ||
2285 chBest->ch_Service == NULL ||
2286 strcmp(sep->se_service, chBest->ch_Service) != 0) {
2287 chBest->ch_Family = sin6->sin6_family;
2288 chBest->ch_Addr6 = sin6->sin6_addr;
2289 if (chBest->ch_Service)
2290 free(chBest->ch_Service);
2291 chBest->ch_Service = strdup(sep->se_service);
2292 bzero(chBest->ch_Times, sizeof(chBest->ch_Times));
2293 }
2294 #endif
2295 chBest->ch_LTime = t;
2296 {
2297 CTime *ct = &chBest->ch_Times[ticks % CHTSIZE];
2298 if (ct->ct_Ticks != ticks) {
2299 ct->ct_Ticks = ticks;
2300 ct->ct_Count = 0;
2301 }
2302 ++ct->ct_Count;
2303 }
2304 for (i = 0; i < CHTSIZE; ++i) {
2305 CTime *ct = &chBest->ch_Times[i];
2306 if (ct->ct_Ticks <= ticks &&
2307 ct->ct_Ticks >= ticks - CHTSIZE) {
2308 cnt += ct->ct_Count;
2309 }
2310 }
2311 if ((cnt * 60) / (CHTSIZE * CHTGRAN) > sep->se_maxcpm) {
2312 char pname[NI_MAXHOST];
2313
2314 getnameinfo((struct sockaddr *)&rss,
2315 ((struct sockaddr *)&rss)->sa_len,
2316 pname, sizeof(pname), NULL, 0,
2317 NI_NUMERICHOST);
2318 r = -1;
2319 syslog(LOG_ERR,
2320 "%s from %s exceeded counts/min (limit %d/min)",
2321 sep->se_service, pname,
2322 sep->se_maxcpm);
2323 }
2324 }
2325 return(r);
2326 }
2327
2328 static struct conninfo *
2329 search_conn(struct servtab *sep, int ctrl)
2330 {
2331 struct sockaddr_storage ss;
2332 socklen_t sslen = sizeof(ss);
2333 struct conninfo *conn;
2334 int hv;
2335 char pname[NI_MAXHOST], pname2[NI_MAXHOST];
2336
2337 if (sep->se_maxperip <= 0)
2338 return NULL;
2339
2340 /*
2341 * If getpeername() fails, just let it through (if logging is
2342 * enabled the condition is caught elsewhere)
2343 */
2344 if (getpeername(ctrl, (struct sockaddr *)&ss, &sslen) != 0)
2345 return NULL;
2346
2347 switch (ss.ss_family) {
2348 case AF_INET:
2349 hv = hashval((char *)&((struct sockaddr_in *)&ss)->sin_addr,
2350 sizeof(struct in_addr));
2351 break;
2352 #ifdef INET6
2353 case AF_INET6:
2354 hv = hashval((char *)&((struct sockaddr_in6 *)&ss)->sin6_addr,
2355 sizeof(struct in6_addr));
2356 break;
2357 #endif
2358 default:
2359 /*
2360 * Since we only support AF_INET and AF_INET6, just
2361 * let other than AF_INET and AF_INET6 through.
2362 */
2363 return NULL;
2364 }
2365
2366 if (getnameinfo((struct sockaddr *)&ss, sslen, pname, sizeof(pname),
2367 NULL, 0, NI_NUMERICHOST) != 0)
2368 return NULL;
2369
2370 LIST_FOREACH(conn, &sep->se_conn[hv], co_link) {
2371 if (getnameinfo((struct sockaddr *)&conn->co_addr,
2372 conn->co_addr.ss_len, pname2, sizeof(pname2), NULL, 0,
2373 NI_NUMERICHOST) == 0 &&
2374 strcmp(pname, pname2) == 0)
2375 break;
2376 }
2377
2378 if (conn == NULL) {
2379 if ((conn = malloc(sizeof(struct conninfo))) == NULL) {
2380 syslog(LOG_ERR, "malloc: %m");
2381 exit(EX_OSERR);
2382 }
2383 conn->co_proc = malloc(sep->se_maxperip * sizeof(*conn->co_proc));
2384 if (conn->co_proc == NULL) {
2385 syslog(LOG_ERR, "malloc: %m");
2386 exit(EX_OSERR);
2387 }
2388 memcpy(&conn->co_addr, (struct sockaddr *)&ss, sslen);
2389 conn->co_numchild = 0;
2390 LIST_INSERT_HEAD(&sep->se_conn[hv], conn, co_link);
2391 }
2392
2393 /*
2394 * Since a child process is not invoked yet, we cannot
2395 * determine a pid of a child. So, co_proc and co_numchild
2396 * should be filled leter.
2397 */
2398
2399 return conn;
2400 }
2401
2402 static int
2403 room_conn(struct servtab *sep, struct conninfo *conn)
2404 {
2405 char pname[NI_MAXHOST];
2406
2407 if (conn->co_numchild >= sep->se_maxperip) {
2408 getnameinfo((struct sockaddr *)&conn->co_addr,
2409 conn->co_addr.ss_len, pname, sizeof(pname), NULL, 0,
2410 NI_NUMERICHOST);
2411 syslog(LOG_ERR, "%s from %s exceeded counts (limit %d)",
2412 sep->se_service, pname, sep->se_maxperip);
2413 return 0;
2414 }
2415 return 1;
2416 }
2417
2418 static void
2419 addchild_conn(struct conninfo *conn, pid_t pid)
2420 {
2421 struct procinfo *proc;
2422
2423 if (conn == NULL)
2424 return;
2425
2426 if ((proc = search_proc(pid, 1)) != NULL) {
2427 if (proc->pr_conn != NULL) {
2428 syslog(LOG_ERR,
2429 "addchild_conn: child already on process list");
2430 exit(EX_OSERR);
2431 }
2432 proc->pr_conn = conn;
2433 }
2434
2435 conn->co_proc[conn->co_numchild++] = proc;
2436 }
2437
2438 static void
2439 reapchild_conn(pid_t pid)
2440 {
2441 struct procinfo *proc;
2442 struct conninfo *conn;
2443 int i;
2444
2445 if ((proc = search_proc(pid, 0)) == NULL)
2446 return;
2447 if ((conn = proc->pr_conn) == NULL)
2448 return;
2449 for (i = 0; i < conn->co_numchild; ++i)
2450 if (conn->co_proc[i] == proc) {
2451 conn->co_proc[i] = conn->co_proc[--conn->co_numchild];
2452 break;
2453 }
2454 free_proc(proc);
2455 free_conn(conn);
2456 }
2457
2458 static void
2459 resize_conn(struct servtab *sep, int maxpip)
2460 {
2461 struct conninfo *conn;
2462 int i, j;
2463
2464 if (sep->se_maxperip <= 0)
2465 return;
2466 if (maxpip <= 0) {
2467 free_connlist(sep);
2468 return;
2469 }
2470 for (i = 0; i < PERIPSIZE; ++i) {
2471 LIST_FOREACH(conn, &sep->se_conn[i], co_link) {
2472 for (j = maxpip; j < conn->co_numchild; ++j)
2473 free_proc(conn->co_proc[j]);
2474 conn->co_proc = realloc(conn->co_proc,
2475 maxpip * sizeof(*conn->co_proc));
2476 if (conn->co_proc == NULL) {
2477 syslog(LOG_ERR, "realloc: %m");
2478 exit(EX_OSERR);
2479 }
2480 if (conn->co_numchild > maxpip)
2481 conn->co_numchild = maxpip;
2482 }
2483 }
2484 }
2485
2486 static void
2487 free_connlist(struct servtab *sep)
2488 {
2489 struct conninfo *conn;
2490 int i, j;
2491
2492 for (i = 0; i < PERIPSIZE; ++i) {
2493 while ((conn = LIST_FIRST(&sep->se_conn[i])) != NULL) {
2494 for (j = 0; j < conn->co_numchild; ++j)
2495 free_proc(conn->co_proc[j]);
2496 conn->co_numchild = 0;
2497 free_conn(conn);
2498 }
2499 }
2500 }
2501
2502 static void
2503 free_conn(struct conninfo *conn)
2504 {
2505 if (conn == NULL)
2506 return;
2507 if (conn->co_numchild <= 0) {
2508 LIST_REMOVE(conn, co_link);
2509 free(conn->co_proc);
2510 free(conn);
2511 }
2512 }
2513
2514 static struct procinfo *
2515 search_proc(pid_t pid, int add)
2516 {
2517 struct procinfo *proc;
2518 int hv;
2519
2520 hv = hashval((char *)&pid, sizeof(pid));
2521 LIST_FOREACH(proc, &proctable[hv], pr_link) {
2522 if (proc->pr_pid == pid)
2523 break;
2524 }
2525 if (proc == NULL && add) {
2526 if ((proc = malloc(sizeof(struct procinfo))) == NULL) {
2527 syslog(LOG_ERR, "malloc: %m");
2528 exit(EX_OSERR);
2529 }
2530 proc->pr_pid = pid;
2531 proc->pr_conn = NULL;
2532 LIST_INSERT_HEAD(&proctable[hv], proc, pr_link);
2533 }
2534 return proc;
2535 }
2536
2537 static void
2538 free_proc(struct procinfo *proc)
2539 {
2540 if (proc == NULL)
2541 return;
2542 LIST_REMOVE(proc, pr_link);
2543 free(proc);
2544 }
2545
2546 static int
2547 hashval(char *p, int len)
2548 {
2549 int i, hv = 0xABC3D20F;
2550
2551 for (i = 0; i < len; ++i, ++p)
2552 hv = (hv << 5) ^ (hv >> 23) ^ *p;
2553 hv = (hv ^ (hv >> 16)) & (PERIPSIZE - 1);
2554 return hv;
2555 }
FreeBSD src