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libc: Avoid negative offsets in link_ntoa().
[dragonfly.git] / usr.sbin / inetd / inetd.c
blob4cf97cc6dba5088d130593168dda5c5bab1c6728
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. 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 * @(#) Copyright (c) 1983, 1991, 1993, 1994 The Regents of the University of California. All rights reserved.
30 * @(#)from: inetd.c 8.4 (Berkeley) 4/13/94
31 * $FreeBSD: src/usr.sbin/inetd/inetd.c,v 1.80.2.11 2003/04/05 13:39:18 dwmalone Exp $
32 */
33
34 /*
35 * Inetd - Internet super-server
36 *
37 * This program invokes all internet services as needed. Connection-oriented
38 * services are invoked each time a connection is made, by creating a process.
39 * This process is passed the connection as file descriptor 0 and is expected
40 * to do a getpeername to find out the source host and port.
41 *
42 * Datagram oriented services are invoked when a datagram
43 * arrives; a process is created and passed a pending message
44 * on file descriptor 0. Datagram servers may either connect
45 * to their peer, freeing up the original socket for inetd
46 * to receive further messages on, or ``take over the socket'',
47 * processing all arriving datagrams and, eventually, timing
48 * out. The first type of server is said to be ``multi-threaded'';
49 * the second type of server ``single-threaded''.
50 *
51 * Inetd uses a configuration file which is read at startup
52 * and, possibly, at some later time in response to a hangup signal.
53 * The configuration file is ``free format'' with fields given in the
54 * order shown below. Continuation lines for an entry must begin with
55 * a space or tab. All fields must be present in each entry.
56 *
57 * service name must be in /etc/services
58 * or name a tcpmux service
59 * or specify a unix domain socket
60 * socket type stream/dgram/raw/rdm/seqpacket
61 * protocol tcp[4][6][/faith,ttcp], udp[4][6], unix
62 * wait/nowait single-threaded/multi-threaded
63 * user user to run daemon as
64 * server program full path name
65 * server program arguments maximum of MAXARGS (20)
66 *
67 * TCP services without official port numbers are handled with the
68 * RFC1078-based tcpmux internal service. Tcpmux listens on port 1 for
69 * requests. When a connection is made from a foreign host, the service
70 * requested is passed to tcpmux, which looks it up in the servtab list
71 * and returns the proper entry for the service. Tcpmux returns a
72 * negative reply if the service doesn't exist, otherwise the invoked
73 * server is expected to return the positive reply if the service type in
74 * inetd.conf file has the prefix "tcpmux/". If the service type has the
75 * prefix "tcpmux/+", tcpmux will return the positive reply for the
76 * process; this is for compatibility with older server code, and also
77 * allows you to invoke programs that use stdin/stdout without putting any
78 * special server code in them. Services that use tcpmux are "nowait"
79 * because they do not have a well-known port and hence cannot listen
80 * for new requests.
81 *
82 * For RPC services
83 * service name/version must be in /etc/rpc
84 * socket type stream/dgram/raw/rdm/seqpacket
85 * protocol rpc/tcp, rpc/udp
86 * wait/nowait single-threaded/multi-threaded
87 * user user to run daemon as
88 * server program full path name
89 * server program arguments maximum of MAXARGS
90 *
91 * Comment lines are indicated by a `#' in column 1.
92 *
93 * #ifdef IPSEC
94 * Comment lines that start with "#@" denote IPsec policy string, as described
95 * in ipsec_set_policy(3). This will affect all the following items in
96 * inetd.conf(8). To reset the policy, just use "#@" line. By default,
97 * there's no IPsec policy.
98 * #endif
99 */
100 #include <sys/param.h>
101 #include <sys/ioctl.h>
102 #include <sys/wait.h>
103 #include <sys/time.h>
104 #include <sys/resource.h>
105 #include <sys/stat.h>
106 #include <sys/un.h>
107
108 #include <netinet/in.h>
109 #include <netinet/tcp.h>
110 #include <arpa/inet.h>
111 #include <rpc/rpc.h>
112 #include <rpc/pmap_clnt.h>
113
114 #include <errno.h>
115 #include <err.h>
116 #include <fcntl.h>
117 #include <grp.h>
118 #include <limits.h>
119 #include <netdb.h>
120 #include <pwd.h>
121 #include <signal.h>
122 #include <stdio.h>
123 #include <stdlib.h>
124 #include <string.h>
125 #include <syslog.h>
126 #include <tcpd.h>
127 #include <unistd.h>
128 #include <libutil.h>
129 #include <sysexits.h>
130 #include <ctype.h>
131
132 #include "inetd.h"
133 #include "pathnames.h"
134
135 #ifdef IPSEC
136 #include <netinet6/ipsec.h>
137 #ifndef IPSEC_POLICY_IPSEC /* no ipsec support on old ipsec */
138 #undef IPSEC
139 #endif
140 #endif
141
142 /* wrapper for KAME-special getnameinfo() */
143 #ifndef NI_WITHSCOPEID
144 #define NI_WITHSCOPEID 0
145 #endif
146
147 #ifndef LIBWRAP_ALLOW_FACILITY
148 # define LIBWRAP_ALLOW_FACILITY LOG_AUTH
149 #endif
150 #ifndef LIBWRAP_ALLOW_SEVERITY
151 # define LIBWRAP_ALLOW_SEVERITY LOG_INFO
152 #endif
153 #ifndef LIBWRAP_DENY_FACILITY
154 # define LIBWRAP_DENY_FACILITY LOG_AUTH
155 #endif
156 #ifndef LIBWRAP_DENY_SEVERITY
157 # define LIBWRAP_DENY_SEVERITY LOG_WARNING
158 #endif
159
160 #define ISWRAP(sep) \
161 ( ((wrap_ex && !(sep)->se_bi) || (wrap_bi && (sep)->se_bi)) \
162 && (sep->se_family == AF_INET || sep->se_family == AF_INET6) \
163 && ( ((sep)->se_accept && (sep)->se_socktype == SOCK_STREAM) \
164 || (sep)->se_socktype == SOCK_DGRAM))
165
166 #ifdef LOGIN_CAP
167 #include <login_cap.h>
168
169 /* see init.c */
170 #define RESOURCE_RC "daemon"
171
172 #endif
173
174 #ifndef MAXCHILD
175 #define MAXCHILD -1 /* maximum number of this service
176 < 0 = no limit */
177 #endif
178
179 #ifndef MAXCPM
180 #define MAXCPM -1 /* rate limit invocations from a
181 single remote address,
182 < 0 = no limit */
183 #endif
184
185 #ifndef MAXPERIP
186 #define MAXPERIP -1 /* maximum number of this service
187 from a single remote address,
188 < 0 = no limit */
189 #endif
190
191 #ifndef TOOMANY
192 #define TOOMANY 256 /* don't start more than TOOMANY */
193 #endif
194 #define CNT_INTVL 60 /* servers in CNT_INTVL sec. */
195 #define RETRYTIME (60*10) /* retry after bind or server fail */
196 #define MAX_MAXCHLD 32767 /* max allowable max children */
197
198 #define SIGBLOCK (sigmask(SIGCHLD)|sigmask(SIGHUP)|sigmask(SIGALRM))
199
200 void close_sep(struct servtab *);
201 void flag_signal(int);
202 void flag_config(int);
203 void config(void);
204 int cpmip(const struct servtab *, int);
205 void endconfig(void);
206 struct servtab *enter(struct servtab *);
207 void freeconfig(struct servtab *);
208 struct servtab *getconfigent(void);
209 int matchservent(const char *, const char *, const char *);
210 char *nextline(FILE *);
211 void addchild(struct servtab *, int);
212 void flag_reapchild(int);
213 void reapchild(void);
214 void enable(struct servtab *);
215 void disable(struct servtab *);
216 void flag_retry(int);
217 void retry(void);
218 int setconfig(void);
219 void setup(struct servtab *);
220 #ifdef IPSEC
221 void ipsecsetup(struct servtab *);
222 #endif
223 void unregisterrpc(struct servtab *sep);
224 static struct conninfo *search_conn(struct servtab *sep, int ctrl);
225 static int room_conn(struct servtab *sep, struct conninfo *conn);
226 static void addchild_conn(struct conninfo *conn, pid_t pid);
227 static void reapchild_conn(pid_t pid);
228 static void free_conn(struct conninfo *conn);
229 static void resize_conn(struct servtab *sep, int maxperip);
230 static void free_connlist(struct servtab *sep);
231 static void free_proc(struct procinfo *);
232 static struct procinfo *search_proc(pid_t pid, int add);
233 static int hashval(char *p, int len);
234
235 int allow_severity;
236 int deny_severity;
237 int wrap_ex = 0;
238 int wrap_bi = 0;
239 int debug = 0;
240 int dolog = 0;
241 int maxsock; /* highest-numbered descriptor */
242 fd_set allsock;
243 int options;
244 int timingout;
245 int toomany = TOOMANY;
246 int maxchild = MAXCHILD;
247 int maxcpm = MAXCPM;
248 int maxperip = MAXPERIP;
249 struct servent *sp;
250 struct rpcent *rpc;
251 char *hostname = NULL;
252 struct sockaddr_in *bind_sa4;
253 int no_v4bind = 1;
254 #ifdef INET6
255 struct sockaddr_in6 *bind_sa6;
256 int no_v6bind = 1;
257 #endif
258 int signalpipe[2];
259 #ifdef SANITY_CHECK
260 int nsock;
261 #endif
262 uid_t euid;
263 gid_t egid;
264 mode_t mask;
265
266 struct servtab *servtab;
267
268 extern struct biltin biltins[];
269
270 #define NUMINT (sizeof(intab) / sizeof(struct inent))
271 const char *CONFIG = _PATH_INETDCONF;
272 const char *pid_file = _PATH_INETDPID;
273
274 static LIST_HEAD(, procinfo) proctable[PERIPSIZE];
275
276 int
277 getvalue(const char *arg, int *value, const char *whine)
278 {
279 int tmp;
280 char *p;
281
282 tmp = strtol(arg, &p, 0);
283 if (tmp < 0 || *p) {
284 syslog(LOG_ERR, whine, arg);
285 return 1; /* failure */
286 }
287 *value = tmp;
288 return 0; /* success */
289 }
290
291 static sa_family_t
292 whichaf(struct request_info *req)
293 {
294 struct sockaddr *sa;
295
296 sa = (struct sockaddr *)req->client->sin;
297 if (sa == NULL)
298 return AF_UNSPEC;
299 if (sa->sa_family == AF_INET6 &&
300 IN6_IS_ADDR_V4MAPPED(&((struct sockaddr_in6 *)sa)->sin6_addr))
301 return AF_INET;
302 return sa->sa_family;
303 }
304
305 int
306 main(int argc, char **argv)
307 {
308 struct servtab *sep;
309 struct passwd *pwd;
310 struct group *grp;
311 struct sigaction sa, saalrm, sachld, sahup, sapipe;
312 int ch, dofork;
313 pid_t pid;
314 char buf[50];
315 #ifdef LOGIN_CAP
316 login_cap_t *lc = NULL;
317 #endif
318 struct request_info req;
319 int denied;
320 char *service = NULL;
321 union {
322 struct sockaddr peer_un;
323 struct sockaddr_in peer_un4;
324 struct sockaddr_in6 peer_un6;
325 struct sockaddr_storage peer_max;
326 } p_un;
327 #define peer p_un.peer_un
328 #define peer4 p_un.peer_un4
329 #define peer6 p_un.peer_un6
330 #define peermax p_un.peer_max
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 */
391 servname = (hostname == NULL) ? "discard" /* dummy */ : NULL;
392
393 bzero(&hints, sizeof(struct addrinfo));
394 hints.ai_flags = AI_PASSIVE;
395 hints.ai_family = AF_UNSPEC;
396 error = getaddrinfo(hostname, servname, &hints, &res);
397 if (error != 0) {
398 syslog(LOG_ERR, "-a %s: %s", hostname, gai_strerror(error));
399 if (error == EAI_SYSTEM)
400 syslog(LOG_ERR, "%s", strerror(errno));
401 exit(EX_USAGE);
402 }
403 do {
404 if (res->ai_addr == NULL) {
405 syslog(LOG_ERR, "-a %s: getaddrinfo failed", hostname);
406 exit(EX_USAGE);
407 }
408 switch (res->ai_addr->sa_family) {
409 case AF_INET:
410 if (no_v4bind == 0)
411 continue;
412 bind_sa4 = (struct sockaddr_in *)res->ai_addr;
413 /* init port num in case servname is dummy */
414 bind_sa4->sin_port = 0;
415 no_v4bind = 0;
416 continue;
417 #ifdef INET6
418 case AF_INET6:
419 if (no_v6bind == 0)
420 continue;
421 bind_sa6 = (struct sockaddr_in6 *)res->ai_addr;
422 /* init port num in case servname is dummy */
423 bind_sa6->sin6_port = 0;
424 no_v6bind = 0;
425 continue;
426 #endif
427 }
428 if (no_v4bind == 0
429 #ifdef INET6
430 && no_v6bind == 0
431 #endif
432 )
433 break;
434 } while ((res = res->ai_next) != NULL);
435 if (no_v4bind != 0
436 #ifdef INET6
437 && no_v6bind != 0
438 #endif
439 ) {
440 syslog(LOG_ERR, "-a %s: unknown address family", hostname);
441 exit(EX_USAGE);
442 }
443
444 euid = geteuid();
445 egid = getegid();
446 umask(mask = umask(0777));
447
448 argc -= optind;
449 argv += optind;
450
451 if (argc > 0)
452 CONFIG = argv[0];
453 if (debug == 0) {
454 FILE *fp;
455 if (daemon(0, 0) < 0) {
456 syslog(LOG_WARNING, "daemon(0,0) failed: %m");
457 }
458 /* From now on we don't want syslog messages going to stderr. */
459 closelog();
460 openlog("inetd", LOG_PID | LOG_NOWAIT, LOG_DAEMON);
461 /*
462 * In case somebody has started inetd manually, we need to
463 * clear the logname, so that old servers run as root do not
464 * get the user's logname..
465 */
466 if (setlogin("") < 0) {
467 syslog(LOG_WARNING, "cannot clear logname: %m");
468 /* no big deal if it fails.. */
469 }
470 pid = getpid();
471 fp = fopen(pid_file, "w");
472 if (fp) {
473 fprintf(fp, "%ld\n", (long)pid);
474 fclose(fp);
475 } else {
476 syslog(LOG_WARNING, "%s: %m", pid_file);
477 }
478 }
479 for (i = 0; i < PERIPSIZE; ++i)
480 LIST_INIT(&proctable[i]);
481 sa.sa_flags = 0;
482 sigemptyset(&sa.sa_mask);
483 sigaddset(&sa.sa_mask, SIGALRM);
484 sigaddset(&sa.sa_mask, SIGCHLD);
485 sigaddset(&sa.sa_mask, SIGHUP);
486 sa.sa_handler = flag_retry;
487 sigaction(SIGALRM, &sa, &saalrm);
488 config();
489 sa.sa_handler = flag_config;
490 sigaction(SIGHUP, &sa, &sahup);
491 sa.sa_handler = flag_reapchild;
492 sigaction(SIGCHLD, &sa, &sachld);
493 sa.sa_handler = SIG_IGN;
494 sigaction(SIGPIPE, &sa, &sapipe);
495
496 {
497 /* space for daemons to overwrite environment for ps */
498 #define DUMMYSIZE 100
499 char dummy[DUMMYSIZE];
500
501 memset(dummy, 'x', DUMMYSIZE - 1);
502 dummy[DUMMYSIZE - 1] = '\0';
503 if (setenv("inetd_dummy", dummy, 1) == -1)
504 syslog(LOG_WARNING, "setenv: cannot set inetd_dummy=%s: %m", dummy);
505
506 }
507
508 if (pipe(signalpipe) != 0) {
509 syslog(LOG_ERR, "pipe: %m");
510 exit(EX_OSERR);
511 }
512 if (fcntl(signalpipe[0], F_SETFD, FD_CLOEXEC) < 0 ||
513 fcntl(signalpipe[1], F_SETFD, FD_CLOEXEC) < 0) {
514 syslog(LOG_ERR, "signalpipe: fcntl (F_SETFD, FD_CLOEXEC): %m");
515 exit(EX_OSERR);
516 }
517 FD_SET(signalpipe[0], &allsock);
518 #ifdef SANITY_CHECK
519 nsock++;
520 #endif
521 if (signalpipe[0] > maxsock)
522 maxsock = signalpipe[0];
523 if (signalpipe[1] > maxsock)
524 maxsock = signalpipe[1];
525
526 for (;;) {
527 int n, ctrl;
528 fd_set readable;
529
530 #ifdef SANITY_CHECK
531 if (nsock == 0) {
532 syslog(LOG_ERR, "%s: nsock=0", __func__);
533 exit(EX_SOFTWARE);
534 }
535 #endif
536 readable = allsock;
537 if ((n = select(maxsock + 1, &readable, NULL, NULL, NULL)) <= 0) {
538 if (n < 0 && errno != EINTR) {
539 syslog(LOG_WARNING, "select: %m");
540 sleep(1);
541 }
542 continue;
543 }
544 /* handle any queued signal flags */
545 if (FD_ISSET(signalpipe[0], &readable)) {
546 int nsig;
547 if (ioctl(signalpipe[0], FIONREAD, &nsig) != 0) {
548 syslog(LOG_ERR, "ioctl: %m");
549 exit(EX_OSERR);
550 }
551 while (--nsig >= 0) {
552 char c;
553 if (read(signalpipe[0], &c, 1) != 1) {
554 syslog(LOG_ERR, "read: %m");
555 exit(EX_OSERR);
556 }
557 if (debug)
558 warnx("handling signal flag %c", c);
559 switch(c) {
560 case 'A': /* sigalrm */
561 retry();
562 break;
563 case 'C': /* sigchld */
564 reapchild();
565 break;
566 case 'H': /* sighup */
567 config();
568 break;
569 }
570 }
571 }
572 for (sep = servtab; n && sep; sep = sep->se_next)
573 if (sep->se_fd != -1 && FD_ISSET(sep->se_fd, &readable)) {
574 n--;
575 if (debug)
576 warnx("someone wants %s", sep->se_service);
577 dofork = !sep->se_bi || sep->se_bi->bi_fork || ISWRAP(sep);
578 conn = NULL;
579 if (sep->se_accept && sep->se_socktype == SOCK_STREAM) {
580 i = 1;
581 if (ioctl(sep->se_fd, FIONBIO, &i) < 0)
582 syslog(LOG_ERR, "ioctl (FIONBIO, 1): %m");
583 ctrl = accept(sep->se_fd, NULL, NULL);
584 if (debug)
585 warnx("accept, ctrl %d", ctrl);
586 if (ctrl < 0) {
587 if (errno != EINTR)
588 syslog(LOG_WARNING,
589 "accept (for %s): %m",
590 sep->se_service);
591 if (sep->se_accept &&
592 sep->se_socktype == SOCK_STREAM)
593 close(ctrl);
594 continue;
595 }
596 i = 0;
597 if (ioctl(sep->se_fd, FIONBIO, &i) < 0)
598 syslog(LOG_ERR, "ioctl1(FIONBIO, 0): %m");
599 if (ioctl(ctrl, FIONBIO, &i) < 0)
600 syslog(LOG_ERR, "ioctl2(FIONBIO, 0): %m");
601 if (cpmip(sep, ctrl) < 0) {
602 close(ctrl);
603 continue;
604 }
605 if (dofork &&
606 (conn = search_conn(sep, ctrl)) != NULL &&
607 !room_conn(sep, conn)) {
608 close(ctrl);
609 continue;
610 }
611 } else
612 ctrl = sep->se_fd;
613 if (dolog && !ISWRAP(sep)) {
614 char pname[INET6_ADDRSTRLEN] = "unknown";
615 socklen_t sl;
616 sl = sizeof peermax;
617 if (getpeername(ctrl, (struct sockaddr *)
618 &peermax, &sl)) {
619 sl = sizeof peermax;
620 if (recvfrom(ctrl, buf, sizeof(buf),
621 MSG_PEEK,
622 (struct sockaddr *)&peermax,
623 &sl) >= 0) {
624 getnameinfo((struct sockaddr *)&peermax,
625 peer.sa_len,
626 pname, sizeof(pname),
627 NULL, 0,
628 NI_NUMERICHOST|
629 NI_WITHSCOPEID);
630 }
631 } else {
632 getnameinfo((struct sockaddr *)&peermax,
633 peer.sa_len,
634 pname, sizeof(pname),
635 NULL, 0,
636 NI_NUMERICHOST|
637 NI_WITHSCOPEID);
638 }
639 syslog(LOG_INFO,"%s from %s", sep->se_service, pname);
640 }
641 sigblock(SIGBLOCK);
642 pid = 0;
643 /*
644 * Fork for all external services, builtins which need to
645 * fork and anything we're wrapping (as wrapping might
646 * block or use hosts_options(5) twist).
647 */
648 if (dofork) {
649 if (sep->se_count++ == 0)
650 gettimeofday(&sep->se_time, NULL);
651 else if (toomany > 0 && sep->se_count >= toomany) {
652 struct timeval now;
653
654 gettimeofday(&now, NULL);
655 if (now.tv_sec - sep->se_time.tv_sec >
656 CNT_INTVL) {
657 sep->se_time = now;
658 sep->se_count = 1;
659 } else {
660 syslog(LOG_ERR,
661 "%s/%s server failing (looping), service terminated",
662 sep->se_service, sep->se_proto);
663 if (sep->se_accept &&
664 sep->se_socktype == SOCK_STREAM)
665 close(ctrl);
666 close_sep(sep);
667 free_conn(conn);
668 sigsetmask(0L);
669 if (!timingout) {
670 timingout = 1;
671 alarm(RETRYTIME);
672 }
673 continue;
674 }
675 }
676 pid = fork();
677 }
678 if (pid < 0) {
679 syslog(LOG_ERR, "fork: %m");
680 if (sep->se_accept &&
681 sep->se_socktype == SOCK_STREAM)
682 close(ctrl);
683 free_conn(conn);
684 sigsetmask(0L);
685 sleep(1);
686 continue;
687 }
688 if (pid) {
689 addchild_conn(conn, pid);
690 addchild(sep, pid);
691 }
692 sigsetmask(0L);
693 if (pid == 0) {
694 if (dofork) {
695 sigaction(SIGALRM, &saalrm, NULL);
696 sigaction(SIGCHLD, &sachld, NULL);
697 sigaction(SIGHUP, &sahup, NULL);
698 /* SIGPIPE reset before exec */
699 }
700 /*
701 * Call tcpmux to find the real service to exec.
702 */
703 if (sep->se_bi &&
704 sep->se_bi->bi_fn == (bi_fn_t *) tcpmux) {
705 sep = tcpmux(ctrl);
706 if (sep == NULL) {
707 close(ctrl);
708 _exit(0);
709 }
710 }
711 if (ISWRAP(sep)) {
712 inetd_setproctitle("wrapping", ctrl);
713 service = sep->se_server_name ?
714 sep->se_server_name : sep->se_service;
715 request_init(&req, RQ_DAEMON, service, RQ_FILE, ctrl, NULL);
716 fromhost(&req);
717 deny_severity = LIBWRAP_DENY_FACILITY|LIBWRAP_DENY_SEVERITY;
718 allow_severity = LIBWRAP_ALLOW_FACILITY|LIBWRAP_ALLOW_SEVERITY;
719 denied = !hosts_access(&req);
720 if (denied) {
721 syslog(deny_severity,
722 "refused connection from %.500s, service %s (%s%s)",
723 eval_client(&req), service, sep->se_proto,
724 (whichaf(&req) == AF_INET6) ? "6" : "");
725 if (sep->se_socktype != SOCK_STREAM)
726 recv(ctrl, buf, sizeof (buf), 0);
727 if (dofork) {
728 sleep(1);
729 _exit(0);
730 }
731 }
732 if (dolog) {
733 syslog(allow_severity,
734 "connection from %.500s, service %s (%s%s)",
735 eval_client(&req), service, sep->se_proto,
736 (whichaf(&req) == AF_INET6) ? "6" : "");
737 }
738 }
739 if (sep->se_bi) {
740 (*sep->se_bi->bi_fn)(ctrl, sep);
741 } else {
742 if (debug)
743 warnx("%d execl %s",
744 getpid(), sep->se_server);
745 /* Clear close-on-exec. */
746 if (fcntl(ctrl, F_SETFD, 0) < 0) {
747 syslog(LOG_ERR,
748 "%s/%s: fcntl (F_SETFD, 0): %m",
749 sep->se_service, sep->se_proto);
750 _exit(EX_OSERR);
751 }
752 if (ctrl != 0) {
753 dup2(ctrl, 0);
754 close(ctrl);
755 }
756 dup2(0, 1);
757 dup2(0, 2);
758 if ((pwd = getpwnam(sep->se_user)) == NULL) {
759 syslog(LOG_ERR,
760 "%s/%s: %s: no such user",
761 sep->se_service, sep->se_proto,
762 sep->se_user);
763 if (sep->se_socktype != SOCK_STREAM)
764 recv(0, buf, sizeof (buf), 0);
765 _exit(EX_NOUSER);
766 }
767 grp = NULL;
768 if ( sep->se_group != NULL
769 && (grp = getgrnam(sep->se_group)) == NULL
770 ) {
771 syslog(LOG_ERR,
772 "%s/%s: %s: no such group",
773 sep->se_service, sep->se_proto,
774 sep->se_group);
775 if (sep->se_socktype != SOCK_STREAM)
776 recv(0, buf, sizeof (buf), 0);
777 _exit(EX_NOUSER);
778 }
779 if (grp != NULL)
780 pwd->pw_gid = grp->gr_gid;
781 #ifdef LOGIN_CAP
782 if ((lc = login_getclass(sep->se_class)) == NULL) {
783 /* error syslogged by getclass */
784 syslog(LOG_ERR,
785 "%s/%s: %s: login class error",
786 sep->se_service, sep->se_proto,
787 sep->se_class);
788 if (sep->se_socktype != SOCK_STREAM)
789 recv(0, buf, sizeof (buf), 0);
790 _exit(EX_NOUSER);
791 }
792 #endif
793 if (setsid() < 0) {
794 syslog(LOG_ERR,
795 "%s: can't setsid(): %m",
796 sep->se_service);
797 /* _exit(EX_OSERR); not fatal yet */
798 }
799 #ifdef LOGIN_CAP
800 if (setusercontext(lc, pwd, pwd->pw_uid,
801 LOGIN_SETALL) != 0) {
802 syslog(LOG_ERR,
803 "%s: can't setusercontext(..%s..): %m",
804 sep->se_service, sep->se_user);
805 _exit(EX_OSERR);
806 }
807 login_close(lc);
808 #else
809 if (pwd->pw_uid) {
810 if (setlogin(sep->se_user) < 0) {
811 syslog(LOG_ERR,
812 "%s: can't setlogin(%s): %m",
813 sep->se_service, sep->se_user);
814 /* _exit(EX_OSERR); not yet */
815 }
816 if (setgid(pwd->pw_gid) < 0) {
817 syslog(LOG_ERR,
818 "%s: can't set gid %d: %m",
819 sep->se_service, pwd->pw_gid);
820 _exit(EX_OSERR);
821 }
822 initgroups(pwd->pw_name,
823 pwd->pw_gid);
824 if (setuid(pwd->pw_uid) < 0) {
825 syslog(LOG_ERR,
826 "%s: can't set uid %d: %m",
827 sep->se_service, pwd->pw_uid);
828 _exit(EX_OSERR);
829 }
830 }
831 #endif
832 sigaction(SIGPIPE, &sapipe, NULL);
833 execv(sep->se_server, sep->se_argv);
834 syslog(LOG_ERR,
835 "cannot execute %s: %m", sep->se_server);
836 if (sep->se_socktype != SOCK_STREAM)
837 recv(0, buf, sizeof (buf), 0);
838 }
839 if (dofork)
840 _exit(0);
841 }
842 if (sep->se_accept && sep->se_socktype == SOCK_STREAM)
843 close(ctrl);
844 }
845 }
846 }
847
848 /*
849 * Add a signal flag to the signal flag queue for later handling
850 */
851
852 void
853 flag_signal(int c)
854 {
855 char ch = c;
856
857 if (write(signalpipe[1], &ch, 1) != 1) {
858 syslog(LOG_ERR, "write: %m");
859 _exit(EX_OSERR);
860 }
861 }
862
863 /*
864 * Record a new child pid for this service. If we've reached the
865 * limit on children, then stop accepting incoming requests.
866 */
867
868 void
869 addchild(struct servtab *sep, pid_t pid)
870 {
871 if (sep->se_maxchild <= 0)
872 return;
873 #ifdef SANITY_CHECK
874 if (sep->se_numchild >= sep->se_maxchild) {
875 syslog(LOG_ERR, "%s: %d >= %d",
876 __func__, sep->se_numchild, sep->se_maxchild);
877 exit(EX_SOFTWARE);
878 }
879 #endif
880 sep->se_pids[sep->se_numchild++] = pid;
881 if (sep->se_numchild == sep->se_maxchild)
882 disable(sep);
883 }
884
885 /*
886 * Some child process has exited. See if it's on somebody's list.
887 */
888
889 void
890 flag_reapchild(int signo __unused)
891 {
892 flag_signal('C');
893 }
894
895 void
896 reapchild(void)
897 {
898 int k, status;
899 pid_t pid;
900 struct servtab *sep;
901
902 for (;;) {
903 pid = wait3(&status, WNOHANG, NULL);
904 if (pid <= 0)
905 break;
906 if (debug)
907 warnx("%d reaped, %s %u", pid,
908 WIFEXITED(status) ? "status" : "signal",
909 WIFEXITED(status) ? WEXITSTATUS(status)
910 : WTERMSIG(status));
911 for (sep = servtab; sep; sep = sep->se_next) {
912 for (k = 0; k < sep->se_numchild; k++)
913 if (sep->se_pids[k] == pid)
914 break;
915 if (k == sep->se_numchild)
916 continue;
917 if (sep->se_numchild == sep->se_maxchild)
918 enable(sep);
919 sep->se_pids[k] = sep->se_pids[--sep->se_numchild];
920 if (WIFSIGNALED(status) || WEXITSTATUS(status))
921 syslog(LOG_WARNING,
922 "%s[%d]: exited, %s %u",
923 sep->se_server, pid,
924 WIFEXITED(status) ? "status" : "signal",
925 WIFEXITED(status) ? WEXITSTATUS(status)
926 : WTERMSIG(status));
927 break;
928 }
929 reapchild_conn(pid);
930 }
931 }
932
933 void
934 flag_config(int signo __unused)
935 {
936 flag_signal('H');
937 }
938
939 void
940 config(void)
941 {
942 struct servtab *sep, *new, **sepp;
943 long omask;
944 #ifdef LOGIN_CAP
945 login_cap_t *lc = NULL;
946 #endif
947
948
949 if (!setconfig()) {
950 syslog(LOG_ERR, "%s: %m", CONFIG);
951 return;
952 }
953 for (sep = servtab; sep; sep = sep->se_next)
954 sep->se_checked = 0;
955 while ((new = getconfigent())) {
956 if (getpwnam(new->se_user) == NULL) {
957 syslog(LOG_ERR,
958 "%s/%s: no such user '%s', service ignored",
959 new->se_service, new->se_proto, new->se_user);
960 continue;
961 }
962 if (new->se_group && getgrnam(new->se_group) == NULL) {
963 syslog(LOG_ERR,
964 "%s/%s: no such group '%s', service ignored",
965 new->se_service, new->se_proto, new->se_group);
966 continue;
967 }
968 #ifdef LOGIN_CAP
969 if ((lc = login_getclass(new->se_class)) == NULL) {
970 /* error syslogged by getclass */
971 syslog(LOG_ERR,
972 "%s/%s: %s: login class error, service ignored",
973 new->se_service, new->se_proto, new->se_class);
974 continue;
975 }
976 login_close(lc);
977 #endif
978 for (sep = servtab; sep; sep = sep->se_next)
979 if (strcmp(sep->se_service, new->se_service) == 0 &&
980 strcmp(sep->se_proto, new->se_proto) == 0 &&
981 sep->se_socktype == new->se_socktype &&
982 sep->se_family == new->se_family)
983 break;
984 if (sep != NULL) {
985 int i;
986
987 #define SWAP(a, b) { typeof(a) c = a; a = b; b = c; }
988 omask = sigblock(SIGBLOCK);
989 if (sep->se_nomapped != new->se_nomapped) {
990 sep->se_nomapped = new->se_nomapped;
991 sep->se_reset = 1;
992 }
993 /* copy over outstanding child pids */
994 if (sep->se_maxchild > 0 && new->se_maxchild > 0) {
995 new->se_numchild = sep->se_numchild;
996 if (new->se_numchild > new->se_maxchild)
997 new->se_numchild = new->se_maxchild;
998 memcpy(new->se_pids, sep->se_pids,
999 new->se_numchild * sizeof(*new->se_pids));
1000 }
1001 SWAP(sep->se_pids, new->se_pids);
1002 sep->se_maxchild = new->se_maxchild;
1003 sep->se_numchild = new->se_numchild;
1004 sep->se_maxcpm = new->se_maxcpm;
1005 resize_conn(sep, new->se_maxperip);
1006 sep->se_maxperip = new->se_maxperip;
1007 sep->se_bi = new->se_bi;
1008 /* might need to turn on or off service now */
1009 if (sep->se_fd >= 0) {
1010 if (sep->se_maxchild > 0
1011 && sep->se_numchild == sep->se_maxchild) {
1012 if (FD_ISSET(sep->se_fd, &allsock))
1013 disable(sep);
1014 } else {
1015 if (!FD_ISSET(sep->se_fd, &allsock))
1016 enable(sep);
1017 }
1018 }
1019 sep->se_accept = new->se_accept;
1020 SWAP(sep->se_user, new->se_user);
1021 SWAP(sep->se_group, new->se_group);
1022 #ifdef LOGIN_CAP
1023 SWAP(sep->se_class, new->se_class);
1024 #endif
1025 SWAP(sep->se_server, new->se_server);
1026 SWAP(sep->se_server_name, new->se_server_name);
1027 for (i = 0; i < MAXARGV; i++)
1028 SWAP(sep->se_argv[i], new->se_argv[i]);
1029 #ifdef IPSEC
1030 SWAP(sep->se_policy, new->se_policy);
1031 ipsecsetup(sep);
1032 #endif
1033 sigsetmask(omask);
1034 freeconfig(new);
1035 if (debug)
1036 print_service("REDO", sep);
1037 } else {
1038 sep = enter(new);
1039 if (debug)
1040 print_service("ADD ", sep);
1041 }
1042 sep->se_checked = 1;
1043 if (ISMUX(sep)) {
1044 sep->se_fd = -1;
1045 continue;
1046 }
1047 switch (sep->se_family) {
1048 case AF_INET:
1049 if (no_v4bind != 0) {
1050 sep->se_fd = -1;
1051 continue;
1052 }
1053 break;
1054 #ifdef INET6
1055 case AF_INET6:
1056 if (no_v6bind != 0) {
1057 sep->se_fd = -1;
1058 continue;
1059 }
1060 break;
1061 #endif
1062 }
1063 if (!sep->se_rpc) {
1064 if (sep->se_family != AF_UNIX) {
1065 sp = getservbyname(sep->se_service, sep->se_proto);
1066 if (sp == NULL) {
1067 syslog(LOG_ERR, "%s/%s: unknown service",
1068 sep->se_service, sep->se_proto);
1069 sep->se_checked = 0;
1070 continue;
1071 }
1072 }
1073 switch (sep->se_family) {
1074 case AF_INET:
1075 if (sp->s_port != sep->se_ctrladdr4.sin_port) {
1076 sep->se_ctrladdr4.sin_port =
1077 sp->s_port;
1078 sep->se_reset = 1;
1079 }
1080 break;
1081 #ifdef INET6
1082 case AF_INET6:
1083 if (sp->s_port !=
1084 sep->se_ctrladdr6.sin6_port) {
1085 sep->se_ctrladdr6.sin6_port =
1086 sp->s_port;
1087 sep->se_reset = 1;
1088 }
1089 break;
1090 #endif
1091 }
1092 if (sep->se_reset != 0 && sep->se_fd >= 0)
1093 close_sep(sep);
1094 } else {
1095 rpc = getrpcbyname(sep->se_service);
1096 if (rpc == NULL) {
1097 syslog(LOG_ERR, "%s/%s unknown RPC service",
1098 sep->se_service, sep->se_proto);
1099 if (sep->se_fd != -1)
1100 close(sep->se_fd);
1101 sep->se_fd = -1;
1102 continue;
1103 }
1104 if (rpc->r_number != sep->se_rpc_prog) {
1105 if (sep->se_rpc_prog)
1106 unregisterrpc(sep);
1107 sep->se_rpc_prog = rpc->r_number;
1108 if (sep->se_fd != -1)
1109 close(sep->se_fd);
1110 sep->se_fd = -1;
1111 }
1112 }
1113 if (sep->se_fd == -1)
1114 setup(sep);
1115 }
1116 endconfig();
1117 /*
1118 * Purge anything not looked at above.
1119 */
1120 omask = sigblock(SIGBLOCK);
1121 sepp = &servtab;
1122 while ((sep = *sepp)) {
1123 if (sep->se_checked) {
1124 sepp = &sep->se_next;
1125 continue;
1126 }
1127 *sepp = sep->se_next;
1128 if (sep->se_fd >= 0)
1129 close_sep(sep);
1130 if (debug)
1131 print_service("FREE", sep);
1132 if (sep->se_rpc && sep->se_rpc_prog > 0)
1133 unregisterrpc(sep);
1134 freeconfig(sep);
1135 free(sep);
1136 }
1137 sigsetmask(omask);
1138 }
1139
1140 void
1141 unregisterrpc(struct servtab *sep)
1142 {
1143 u_int i;
1144 struct servtab *sepp;
1145 long omask;
1146
1147 omask = sigblock(SIGBLOCK);
1148 for (sepp = servtab; sepp; sepp = sepp->se_next) {
1149 if (sepp == sep)
1150 continue;
1151 if (sep->se_checked == 0 ||
1152 !sepp->se_rpc ||
1153 sep->se_rpc_prog != sepp->se_rpc_prog)
1154 continue;
1155 return;
1156 }
1157 if (debug)
1158 print_service("UNREG", sep);
1159 for (i = sep->se_rpc_lowvers; i <= sep->se_rpc_highvers; i++)
1160 pmap_unset(sep->se_rpc_prog, i);
1161 if (sep->se_fd != -1)
1162 close(sep->se_fd);
1163 sep->se_fd = -1;
1164 sigsetmask(omask);
1165 }
1166
1167 void
1168 flag_retry(int signo __unused)
1169 {
1170 flag_signal('A');
1171 }
1172
1173 void
1174 retry(void)
1175 {
1176 struct servtab *sep;
1177
1178 timingout = 0;
1179 for (sep = servtab; sep; sep = sep->se_next)
1180 if (sep->se_fd == -1 && !ISMUX(sep))
1181 setup(sep);
1182 }
1183
1184 void
1185 setup(struct servtab *sep)
1186 {
1187 int on = 1;
1188
1189 if ((sep->se_fd = socket(sep->se_family, sep->se_socktype, 0)) < 0) {
1190 if (debug)
1191 warn("socket failed on %s/%s",
1192 sep->se_service, sep->se_proto);
1193 syslog(LOG_ERR, "%s/%s: socket: %m",
1194 sep->se_service, sep->se_proto);
1195 return;
1196 }
1197 /* Set all listening sockets to close-on-exec. */
1198 if (fcntl(sep->se_fd, F_SETFD, FD_CLOEXEC) < 0) {
1199 syslog(LOG_ERR, "%s/%s: fcntl (F_SETFD, FD_CLOEXEC): %m",
1200 sep->se_service, sep->se_proto);
1201 close(sep->se_fd);
1202 return;
1203 }
1204 #define turnon(fd, opt) \
1205 setsockopt(fd, SOL_SOCKET, opt, (char *)&on, sizeof (on))
1206 if (strcmp(sep->se_proto, "tcp") == 0 && (options & SO_DEBUG) &&
1207 turnon(sep->se_fd, SO_DEBUG) < 0)
1208 syslog(LOG_ERR, "setsockopt (SO_DEBUG): %m");
1209 if (turnon(sep->se_fd, SO_REUSEADDR) < 0)
1210 syslog(LOG_ERR, "setsockopt (SO_REUSEADDR): %m");
1211 #ifdef SO_PRIVSTATE
1212 if (turnon(sep->se_fd, SO_PRIVSTATE) < 0)
1213 syslog(LOG_ERR, "setsockopt (SO_PRIVSTATE): %m");
1214 #endif
1215 /* tftpd opens a new connection then needs more infos */
1216 if ((sep->se_family == AF_INET6) &&
1217 (strcmp(sep->se_proto, "udp") == 0) &&
1218 (sep->se_accept == 0) &&
1219 (setsockopt(sep->se_fd, IPPROTO_IPV6, IPV6_PKTINFO,
1220 (char *)&on, sizeof (on)) < 0))
1221 syslog(LOG_ERR, "setsockopt (IPV6_RECVPKTINFO): %m");
1222 if (sep->se_family == AF_INET6) {
1223 int flag = sep->se_nomapped ? 1 : 0;
1224 if (setsockopt(sep->se_fd, IPPROTO_IPV6, IPV6_V6ONLY,
1225 (char *)&flag, sizeof (flag)) < 0)
1226 syslog(LOG_ERR, "setsockopt (IPV6_V6ONLY): %m");
1227 }
1228 #undef turnon
1229 if (sep->se_type == TTCP_TYPE)
1230 if (setsockopt(sep->se_fd, IPPROTO_TCP, TCP_NOPUSH,
1231 (char *)&on, sizeof (on)) < 0)
1232 syslog(LOG_ERR, "setsockopt (TCP_NOPUSH): %m");
1233 #ifdef IPV6_FAITH
1234 if (sep->se_type == FAITH_TYPE) {
1235 if (setsockopt(sep->se_fd, IPPROTO_IPV6, IPV6_FAITH, &on,
1236 sizeof(on)) < 0) {
1237 syslog(LOG_ERR, "setsockopt (IPV6_FAITH): %m");
1238 }
1239 }
1240 #endif
1241 #ifdef IPSEC
1242 ipsecsetup(sep);
1243 #endif
1244 if (sep->se_family == AF_UNIX) {
1245 unlink(sep->se_ctrladdr_un.sun_path);
1246 umask(0777); /* Make socket with conservative permissions */
1247 }
1248 if (bind(sep->se_fd, (struct sockaddr *)&sep->se_ctrladdr,
1249 sep->se_ctrladdr_size) < 0) {
1250 if (debug)
1251 warn("bind failed on %s/%s",
1252 sep->se_service, sep->se_proto);
1253 syslog(LOG_ERR, "%s/%s: bind: %m",
1254 sep->se_service, sep->se_proto);
1255 close(sep->se_fd);
1256 sep->se_fd = -1;
1257 if (!timingout) {
1258 timingout = 1;
1259 alarm(RETRYTIME);
1260 }
1261 if (sep->se_family == AF_UNIX)
1262 umask(mask);
1263 return;
1264 }
1265 if (sep->se_family == AF_UNIX) {
1266 /* Ick - fch{own,mod} don't work on Unix domain sockets */
1267 if (chown(sep->se_service, sep->se_sockuid, sep->se_sockgid) < 0)
1268 syslog(LOG_ERR, "chown socket: %m");
1269 if (chmod(sep->se_service, sep->se_sockmode) < 0)
1270 syslog(LOG_ERR, "chmod socket: %m");
1271 umask(mask);
1272 }
1273 if (sep->se_rpc) {
1274 u_int i;
1275 socklen_t len = sep->se_ctrladdr_size;
1276
1277 if (sep->se_family != AF_INET) {
1278 syslog(LOG_ERR,
1279 "%s/%s: unsupported address family for rpc",
1280 sep->se_service, sep->se_proto);
1281 close(sep->se_fd);
1282 sep->se_fd = -1;
1283 return;
1284 }
1285 if (getsockname(sep->se_fd,
1286 (struct sockaddr*)&sep->se_ctrladdr, &len) < 0){
1287 syslog(LOG_ERR, "%s/%s: getsockname: %m",
1288 sep->se_service, sep->se_proto);
1289 close(sep->se_fd);
1290 sep->se_fd = -1;
1291 return;
1292 }
1293 if (debug)
1294 print_service("REG ", sep);
1295 for (i = sep->se_rpc_lowvers; i <= sep->se_rpc_highvers; i++) {
1296 pmap_unset(sep->se_rpc_prog, i);
1297 pmap_set(sep->se_rpc_prog, i,
1298 (sep->se_socktype == SOCK_DGRAM)
1299 ? IPPROTO_UDP : IPPROTO_TCP,
1300 ntohs(sep->se_ctrladdr4.sin_port));
1301 }
1302 }
1303 if (sep->se_socktype == SOCK_STREAM)
1304 listen(sep->se_fd, 64);
1305 enable(sep);
1306 if (debug) {
1307 warnx("registered %s on %d",
1308 sep->se_server, sep->se_fd);
1309 }
1310 }
1311
1312 #ifdef IPSEC
1313 void
1314 ipsecsetup(struct servtab *sep)
1315 {
1316 char *buf;
1317 char *policy_in = NULL;
1318 char *policy_out = NULL;
1319 int level;
1320 int opt;
1321
1322 switch (sep->se_family) {
1323 case AF_INET:
1324 level = IPPROTO_IP;
1325 opt = IP_IPSEC_POLICY;
1326 break;
1327 #ifdef INET6
1328 case AF_INET6:
1329 level = IPPROTO_IPV6;
1330 opt = IPV6_IPSEC_POLICY;
1331 break;
1332 #endif
1333 default:
1334 return;
1335 }
1336
1337 if (!sep->se_policy || sep->se_policy[0] == '\0') {
1338 static char def_in[] = "in entrust", def_out[] = "out entrust";
1339 policy_in = def_in;
1340 policy_out = def_out;
1341 } else {
1342 if (!strncmp("in", sep->se_policy, 2))
1343 policy_in = sep->se_policy;
1344 else if (!strncmp("out", sep->se_policy, 3))
1345 policy_out = sep->se_policy;
1346 else {
1347 syslog(LOG_ERR, "invalid security policy \"%s\"",
1348 sep->se_policy);
1349 return;
1350 }
1351 }
1352
1353 if (policy_in != NULL) {
1354 buf = ipsec_set_policy(policy_in, strlen(policy_in));
1355 if (buf != NULL) {
1356 if (setsockopt(sep->se_fd, level, opt,
1357 buf, ipsec_get_policylen(buf)) < 0 &&
1358 debug != 0)
1359 warnx("%s/%s: ipsec initialization failed; %s",
1360 sep->se_service, sep->se_proto,
1361 policy_in);
1362 free(buf);
1363 } else
1364 syslog(LOG_ERR, "invalid security policy \"%s\"",
1365 policy_in);
1366 }
1367 if (policy_out != NULL) {
1368 buf = ipsec_set_policy(policy_out, strlen(policy_out));
1369 if (buf != NULL) {
1370 if (setsockopt(sep->se_fd, level, opt,
1371 buf, ipsec_get_policylen(buf)) < 0 &&
1372 debug != 0)
1373 warnx("%s/%s: ipsec initialization failed; %s",
1374 sep->se_service, sep->se_proto,
1375 policy_out);
1376 free(buf);
1377 } else
1378 syslog(LOG_ERR, "invalid security policy \"%s\"",
1379 policy_out);
1380 }
1381 }
1382 #endif
1383
1384 /*
1385 * Finish with a service and its socket.
1386 */
1387 void
1388 close_sep(struct servtab *sep)
1389 {
1390 if (sep->se_fd >= 0) {
1391 if (FD_ISSET(sep->se_fd, &allsock))
1392 disable(sep);
1393 close(sep->se_fd);
1394 sep->se_fd = -1;
1395 }
1396 sep->se_count = 0;
1397 sep->se_numchild = 0; /* forget about any existing children */
1398 }
1399
1400 int
1401 matchservent(const char *name1, const char *name2, const char *proto)
1402 {
1403 char **alias, *p;
1404 struct servent *se;
1405
1406 if (strcmp(proto, "unix") == 0) {
1407 if ((p = strrchr(name1, '/')) != NULL)
1408 name1 = p + 1;
1409 if ((p = strrchr(name2, '/')) != NULL)
1410 name2 = p + 1;
1411 }
1412 if (strcmp(name1, name2) == 0)
1413 return(1);
1414 if ((se = getservbyname(name1, proto)) != NULL) {
1415 if (strcmp(name2, se->s_name) == 0)
1416 return(1);
1417 for (alias = se->s_aliases; *alias; alias++)
1418 if (strcmp(name2, *alias) == 0)
1419 return(1);
1420 }
1421 return(0);
1422 }
1423
1424 struct servtab *
1425 enter(struct servtab *cp)
1426 {
1427 struct servtab *sep;
1428 long omask;
1429
1430 sep = (struct servtab *)malloc(sizeof (*sep));
1431 if (sep == NULL) {
1432 syslog(LOG_ERR, "malloc: %m");
1433 exit(EX_OSERR);
1434 }
1435 *sep = *cp;
1436 sep->se_fd = -1;
1437 omask = sigblock(SIGBLOCK);
1438 sep->se_next = servtab;
1439 servtab = sep;
1440 sigsetmask(omask);
1441 return (sep);
1442 }
1443
1444 void
1445 enable(struct servtab *sep)
1446 {
1447 if (debug)
1448 warnx(
1449 "enabling %s, fd %d", sep->se_service, sep->se_fd);
1450 #ifdef SANITY_CHECK
1451 if (sep->se_fd < 0) {
1452 syslog(LOG_ERR,
1453 "%s: %s: bad fd", __func__, sep->se_service);
1454 exit(EX_SOFTWARE);
1455 }
1456 if (ISMUX(sep)) {
1457 syslog(LOG_ERR,
1458 "%s: %s: is mux", __func__, sep->se_service);
1459 exit(EX_SOFTWARE);
1460 }
1461 if (FD_ISSET(sep->se_fd, &allsock)) {
1462 syslog(LOG_ERR,
1463 "%s: %s: not off", __func__, sep->se_service);
1464 exit(EX_SOFTWARE);
1465 }
1466 nsock++;
1467 #endif
1468 FD_SET(sep->se_fd, &allsock);
1469 if (sep->se_fd > maxsock)
1470 maxsock = sep->se_fd;
1471 }
1472
1473 void
1474 disable(struct servtab *sep)
1475 {
1476 if (debug)
1477 warnx(
1478 "disabling %s, fd %d", sep->se_service, sep->se_fd);
1479 #ifdef SANITY_CHECK
1480 if (sep->se_fd < 0) {
1481 syslog(LOG_ERR,
1482 "%s: %s: bad fd", __func__, sep->se_service);
1483 exit(EX_SOFTWARE);
1484 }
1485 if (ISMUX(sep)) {
1486 syslog(LOG_ERR,
1487 "%s: %s: is mux", __func__, sep->se_service);
1488 exit(EX_SOFTWARE);
1489 }
1490 if (!FD_ISSET(sep->se_fd, &allsock)) {
1491 syslog(LOG_ERR,
1492 "%s: %s: not on", __func__, sep->se_service);
1493 exit(EX_SOFTWARE);
1494 }
1495 if (nsock == 0) {
1496 syslog(LOG_ERR, "%s: nsock=0", __func__);
1497 exit(EX_SOFTWARE);
1498 }
1499 nsock--;
1500 #endif
1501 FD_CLR(sep->se_fd, &allsock);
1502 if (sep->se_fd == maxsock)
1503 maxsock--;
1504 }
1505
1506 FILE *fconfig = NULL;
1507 struct servtab serv;
1508 char line[LINE_MAX];
1509
1510 int
1511 setconfig(void)
1512 {
1513
1514 if (fconfig != NULL) {
1515 fseek(fconfig, 0L, SEEK_SET);
1516 return (1);
1517 }
1518 fconfig = fopen(CONFIG, "r");
1519 return (fconfig != NULL);
1520 }
1521
1522 void
1523 endconfig(void)
1524 {
1525 if (fconfig) {
1526 fclose(fconfig);
1527 fconfig = NULL;
1528 }
1529 }
1530
1531 struct servtab *
1532 getconfigent(void)
1533 {
1534 struct servtab *sep = &serv;
1535 int argc;
1536 char *cp, *arg, *s;
1537 char *versp;
1538 static char TCPMUX_TOKEN[] = "tcpmux/";
1539 #define MUX_LEN (sizeof(TCPMUX_TOKEN)-1)
1540 #ifdef IPSEC
1541 char *policy = NULL;
1542 #endif
1543 int v4bind = 0;
1544 #ifdef INET6
1545 int v6bind = 0;
1546 #endif
1547 int i;
1548
1549 more:
1550 while ((cp = nextline(fconfig)) != NULL) {
1551 #ifdef IPSEC
1552 /* lines starting with #@ is not a comment, but the policy */
1553 if (cp[0] == '#' && cp[1] == '@') {
1554 char *p;
1555 for (p = cp + 2; p && *p && isspace(*p); p++)
1556 ;
1557 if (*p == '\0') {
1558 if (policy)
1559 free(policy);
1560 policy = NULL;
1561 } else if (ipsec_get_policylen(p) >= 0) {
1562 if (policy)
1563 free(policy);
1564 policy = newstr(p);
1565 } else {
1566 syslog(LOG_ERR,
1567 "%s: invalid ipsec policy \"%s\"",
1568 CONFIG, p);
1569 exit(EX_CONFIG);
1570 }
1571 }
1572 #endif
1573 if (*cp == '#' || *cp == '\0')
1574 continue;
1575 break;
1576 }
1577 if (cp == NULL)
1578 return (NULL);
1579 /*
1580 * clear the static buffer, since some fields (se_ctrladdr,
1581 * for example) don't get initialized here.
1582 */
1583 memset(sep, 0, sizeof *sep);
1584 arg = skip(&cp);
1585 if (cp == NULL) {
1586 /* got an empty line containing just blanks/tabs. */
1587 goto more;
1588 }
1589 if (arg[0] == ':') { /* :user:group:perm: */
1590 char *user, *group, *perm;
1591 struct passwd *pw;
1592 struct group *gr;
1593 user = arg+1;
1594 if ((group = strchr(user, ':')) == NULL) {
1595 syslog(LOG_ERR, "no group after user '%s'", user);
1596 goto more;
1597 }
1598 *group++ = '\0';
1599 if ((perm = strchr(group, ':')) == NULL) {
1600 syslog(LOG_ERR, "no mode after group '%s'", group);
1601 goto more;
1602 }
1603 *perm++ = '\0';
1604 if ((pw = getpwnam(user)) == NULL) {
1605 syslog(LOG_ERR, "no such user '%s'", user);
1606 goto more;
1607 }
1608 sep->se_sockuid = pw->pw_uid;
1609 if ((gr = getgrnam(group)) == NULL) {
1610 syslog(LOG_ERR, "no such user '%s'", group);
1611 goto more;
1612 }
1613 sep->se_sockgid = gr->gr_gid;
1614 sep->se_sockmode = strtol(perm, &arg, 8);
1615 if (*arg != ':') {
1616 syslog(LOG_ERR, "bad mode '%s'", perm);
1617 goto more;
1618 }
1619 *arg++ = '\0';
1620 } else {
1621 sep->se_sockuid = euid;
1622 sep->se_sockgid = egid;
1623 sep->se_sockmode = 0200;
1624 }
1625 if (strncmp(arg, TCPMUX_TOKEN, MUX_LEN) == 0) {
1626 char *c = arg + MUX_LEN;
1627 if (*c == '+') {
1628 sep->se_type = MUXPLUS_TYPE;
1629 c++;
1630 } else
1631 sep->se_type = MUX_TYPE;
1632 sep->se_service = newstr(c);
1633 } else {
1634 sep->se_service = newstr(arg);
1635 sep->se_type = NORM_TYPE;
1636 }
1637 arg = sskip(&cp);
1638 if (strcmp(arg, "stream") == 0)
1639 sep->se_socktype = SOCK_STREAM;
1640 else if (strcmp(arg, "dgram") == 0)
1641 sep->se_socktype = SOCK_DGRAM;
1642 else if (strcmp(arg, "rdm") == 0)
1643 sep->se_socktype = SOCK_RDM;
1644 else if (strcmp(arg, "seqpacket") == 0)
1645 sep->se_socktype = SOCK_SEQPACKET;
1646 else if (strcmp(arg, "raw") == 0)
1647 sep->se_socktype = SOCK_RAW;
1648 else
1649 sep->se_socktype = -1;
1650
1651 arg = sskip(&cp);
1652 if (strncmp(arg, "tcp", 3) == 0) {
1653 sep->se_proto = newstr(strsep(&arg, "/"));
1654 if (arg != NULL) {
1655 if (strcmp(arg, "ttcp") == 0)
1656 sep->se_type = TTCP_TYPE;
1657 else if (strcmp(arg, "faith") == 0)
1658 sep->se_type = FAITH_TYPE;
1659 }
1660 } else {
1661 if (sep->se_type == NORM_TYPE &&
1662 strncmp(arg, "faith/", 6) == 0) {
1663 arg += 6;
1664 sep->se_type = FAITH_TYPE;
1665 }
1666 sep->se_proto = newstr(arg);
1667 }
1668 if (strncmp(sep->se_proto, "rpc/", 4) == 0) {
1669 if (no_v4bind != 0) {
1670 syslog(LOG_NOTICE, "IPv4 bind is ignored for %s",
1671 sep->se_service);
1672 freeconfig(sep);
1673 goto more;
1674 }
1675 memmove(sep->se_proto, sep->se_proto + 4,
1676 strlen(sep->se_proto) + 1 - 4);
1677 sep->se_rpc = 1;
1678 sep->se_rpc_prog = sep->se_rpc_lowvers =
1679 sep->se_rpc_highvers = 0;
1680 memcpy(&sep->se_ctrladdr4, bind_sa4,
1681 sizeof(sep->se_ctrladdr4));
1682 if ((versp = strrchr(sep->se_service, '/'))) {
1683 *versp++ = '\0';
1684 switch (sscanf(versp, "%u-%u",
1685 &sep->se_rpc_lowvers,
1686 &sep->se_rpc_highvers)) {
1687 case 2:
1688 break;
1689 case 1:
1690 sep->se_rpc_highvers =
1691 sep->se_rpc_lowvers;
1692 break;
1693 default:
1694 syslog(LOG_ERR,
1695 "bad RPC version specifier; %s",
1696 sep->se_service);
1697 freeconfig(sep);
1698 goto more;
1699 }
1700 }
1701 else {
1702 sep->se_rpc_lowvers =
1703 sep->se_rpc_highvers = 1;
1704 }
1705 }
1706 sep->se_nomapped = 0;
1707 while (isdigit(sep->se_proto[strlen(sep->se_proto) - 1])) {
1708 #ifdef INET6
1709 if (sep->se_proto[strlen(sep->se_proto) - 1] == '6') {
1710 if (no_v6bind != 0) {
1711 syslog(LOG_NOTICE, "IPv6 bind is ignored for %s",
1712 sep->se_service);
1713 freeconfig(sep);
1714 goto more;
1715 }
1716 sep->se_proto[strlen(sep->se_proto) - 1] = '\0';
1717 v6bind = 1;
1718 continue;
1719 }
1720 #endif
1721 if (sep->se_proto[strlen(sep->se_proto) - 1] == '4') {
1722 sep->se_proto[strlen(sep->se_proto) - 1] = '\0';
1723 v4bind = 1;
1724 continue;
1725 }
1726 /* illegal version num */
1727 syslog(LOG_ERR, "bad IP version for %s", sep->se_proto);
1728 freeconfig(sep);
1729 goto more;
1730 }
1731 if (strcmp(sep->se_proto, "unix") == 0) {
1732 sep->se_family = AF_UNIX;
1733 } else
1734 #ifdef INET6
1735 if (v6bind != 0) {
1736 sep->se_family = AF_INET6;
1737 if (v4bind == 0 || no_v4bind != 0)
1738 sep->se_nomapped = 1;
1739 } else
1740 #endif
1741 { /* default to v4 bind if not v6 bind */
1742 if (no_v4bind != 0) {
1743 syslog(LOG_NOTICE, "IPv4 bind is ignored for %s",
1744 sep->se_service);
1745 freeconfig(sep);
1746 goto more;
1747 }
1748 sep->se_family = AF_INET;
1749 }
1750 /* init ctladdr */
1751 switch(sep->se_family) {
1752 case AF_INET:
1753 memcpy(&sep->se_ctrladdr4, bind_sa4,
1754 sizeof(sep->se_ctrladdr4));
1755 sep->se_ctrladdr_size = sizeof(sep->se_ctrladdr4);
1756 break;
1757 #ifdef INET6
1758 case AF_INET6:
1759 memcpy(&sep->se_ctrladdr6, bind_sa6,
1760 sizeof(sep->se_ctrladdr6));
1761 sep->se_ctrladdr_size = sizeof(sep->se_ctrladdr6);
1762 break;
1763 #endif
1764 case AF_UNIX:
1765 if (strlen(sep->se_service) >= sizeof(sep->se_ctrladdr_un.sun_path)) {
1766 syslog(LOG_ERR,
1767 "domain socket pathname too long for service %s",
1768 sep->se_service);
1769 goto more;
1770 }
1771 memset(&sep->se_ctrladdr, 0, sizeof(sep->se_ctrladdr));
1772 sep->se_ctrladdr_un.sun_family = sep->se_family;
1773 sep->se_ctrladdr_un.sun_len = strlen(sep->se_service);
1774 strcpy(sep->se_ctrladdr_un.sun_path, sep->se_service);
1775 sep->se_ctrladdr_size = SUN_LEN(&sep->se_ctrladdr_un);
1776 }
1777 arg = sskip(&cp);
1778 if (!strncmp(arg, "wait", 4))
1779 sep->se_accept = 0;
1780 else if (!strncmp(arg, "nowait", 6))
1781 sep->se_accept = 1;
1782 else {
1783 syslog(LOG_ERR,
1784 "%s: bad wait/nowait for service %s",
1785 CONFIG, sep->se_service);
1786 goto more;
1787 }
1788 sep->se_maxchild = -1;
1789 sep->se_maxcpm = -1;
1790 sep->se_maxperip = -1;
1791 if ((s = strchr(arg, '/')) != NULL) {
1792 char *eptr;
1793 u_long val;
1794
1795 val = strtoul(s + 1, &eptr, 10);
1796 if (eptr == s + 1 || val > MAX_MAXCHLD) {
1797 syslog(LOG_ERR,
1798 "%s: bad max-child for service %s",
1799 CONFIG, sep->se_service);
1800 goto more;
1801 }
1802 if (debug)
1803 if (!sep->se_accept && val != 1)
1804 warnx("maxchild=%lu for wait service %s"
1805 " not recommended", val, sep->se_service);
1806 sep->se_maxchild = val;
1807 if (*eptr == '/')
1808 sep->se_maxcpm = strtol(eptr + 1, &eptr, 10);
1809 if (*eptr == '/')
1810 sep->se_maxperip = strtol(eptr + 1, &eptr, 10);
1811 /*
1812 * explicitly do not check for \0 for future expansion /
1813 * backwards compatibility
1814 */
1815 }
1816 if (ISMUX(sep)) {
1817 /*
1818 * Silently enforce "nowait" mode for TCPMUX services
1819 * since they don't have an assigned port to listen on.
1820 */
1821 sep->se_accept = 1;
1822 if (strcmp(sep->se_proto, "tcp")) {
1823 syslog(LOG_ERR,
1824 "%s: bad protocol for tcpmux service %s",
1825 CONFIG, sep->se_service);
1826 goto more;
1827 }
1828 if (sep->se_socktype != SOCK_STREAM) {
1829 syslog(LOG_ERR,
1830 "%s: bad socket type for tcpmux service %s",
1831 CONFIG, sep->se_service);
1832 goto more;
1833 }
1834 }
1835 sep->se_user = newstr(sskip(&cp));
1836 #ifdef LOGIN_CAP
1837 if ((s = strrchr(sep->se_user, '/')) != NULL) {
1838 *s = '\0';
1839 sep->se_class = newstr(s + 1);
1840 } else
1841 sep->se_class = newstr(RESOURCE_RC);
1842 #endif
1843 if ((s = strrchr(sep->se_user, ':')) != NULL) {
1844 *s = '\0';
1845 sep->se_group = newstr(s + 1);
1846 } else
1847 sep->se_group = NULL;
1848 sep->se_server = newstr(sskip(&cp));
1849 if ((sep->se_server_name = strrchr(sep->se_server, '/')))
1850 sep->se_server_name++;
1851 if (strcmp(sep->se_server, "internal") == 0) {
1852 struct biltin *bi;
1853
1854 for (bi = biltins; bi->bi_service; bi++)
1855 if (bi->bi_socktype == sep->se_socktype &&
1856 matchservent(bi->bi_service, sep->se_service,
1857 sep->se_proto))
1858 break;
1859 if (bi->bi_service == 0) {
1860 syslog(LOG_ERR, "internal service %s unknown",
1861 sep->se_service);
1862 goto more;
1863 }
1864 sep->se_accept = 1; /* force accept mode for built-ins */
1865 sep->se_bi = bi;
1866 } else
1867 sep->se_bi = NULL;
1868 if (sep->se_maxperip < 0)
1869 sep->se_maxperip = maxperip;
1870 if (sep->se_maxcpm < 0)
1871 sep->se_maxcpm = maxcpm;
1872 if (sep->se_maxchild < 0) { /* apply default max-children */
1873 if (sep->se_bi && sep->se_bi->bi_maxchild >= 0)
1874 sep->se_maxchild = sep->se_bi->bi_maxchild;
1875 else if (sep->se_accept)
1876 sep->se_maxchild = maxchild > 0 ? maxchild : 0;
1877 else
1878 sep->se_maxchild = 1;
1879 }
1880 if (sep->se_maxchild > 0) {
1881 sep->se_pids = malloc(sep->se_maxchild * sizeof(*sep->se_pids));
1882 if (sep->se_pids == NULL) {
1883 syslog(LOG_ERR, "malloc: %m");
1884 exit(EX_OSERR);
1885 }
1886 }
1887 argc = 0;
1888 for (arg = skip(&cp); cp; arg = skip(&cp))
1889 if (argc < MAXARGV) {
1890 sep->se_argv[argc++] = newstr(arg);
1891 } else {
1892 syslog(LOG_ERR,
1893 "%s: too many arguments for service %s",
1894 CONFIG, sep->se_service);
1895 goto more;
1896 }
1897 while (argc <= MAXARGV)
1898 sep->se_argv[argc++] = NULL;
1899 for (i = 0; i < PERIPSIZE; ++i)
1900 LIST_INIT(&sep->se_conn[i]);
1901 #ifdef IPSEC
1902 sep->se_policy = policy ? newstr(policy) : NULL;
1903 #endif
1904 return (sep);
1905 }
1906
1907 void
1908 freeconfig(struct servtab *cp)
1909 {
1910 int i;
1911
1912 if (cp->se_service)
1913 free(cp->se_service);
1914 if (cp->se_proto)
1915 free(cp->se_proto);
1916 if (cp->se_user)
1917 free(cp->se_user);
1918 if (cp->se_group)
1919 free(cp->se_group);
1920 #ifdef LOGIN_CAP
1921 if (cp->se_class)
1922 free(cp->se_class);
1923 #endif
1924 if (cp->se_server)
1925 free(cp->se_server);
1926 if (cp->se_pids)
1927 free(cp->se_pids);
1928 for (i = 0; i < MAXARGV; i++)
1929 if (cp->se_argv[i])
1930 free(cp->se_argv[i]);
1931 free_connlist(cp);
1932 #ifdef IPSEC
1933 if (cp->se_policy)
1934 free(cp->se_policy);
1935 #endif
1936 }
1937
1938
1939 /*
1940 * Safe skip - if skip returns null, log a syntax error in the
1941 * configuration file and exit.
1942 */
1943 char *
1944 sskip(char **cpp)
1945 {
1946 char *cp;
1947
1948 cp = skip(cpp);
1949 if (cp == NULL) {
1950 syslog(LOG_ERR, "%s: syntax error", CONFIG);
1951 exit(EX_DATAERR);
1952 }
1953 return (cp);
1954 }
1955
1956 char *
1957 skip(char **cpp)
1958 {
1959 char *cp = *cpp;
1960 char *start;
1961 char quote = '\0';
1962
1963 again:
1964 while (*cp == ' ' || *cp == '\t')
1965 cp++;
1966 if (*cp == '\0') {
1967 int c;
1968
1969 c = getc(fconfig);
1970 ungetc(c, fconfig);
1971 if (c == ' ' || c == '\t')
1972 if ((cp = nextline(fconfig)))
1973 goto again;
1974 *cpp = NULL;
1975 return (NULL);
1976 }
1977 if (*cp == '"' || *cp == '\'')
1978 quote = *cp++;
1979 start = cp;
1980 if (quote)
1981 while (*cp && *cp != quote)
1982 cp++;
1983 else
1984 while (*cp && *cp != ' ' && *cp != '\t')
1985 cp++;
1986 if (*cp != '\0')
1987 *cp++ = '\0';
1988 *cpp = cp;
1989 return (start);
1990 }
1991
1992 char *
1993 nextline(FILE *fd)
1994 {
1995 char *cp;
1996
1997 if (fgets(line, sizeof (line), fd) == NULL)
1998 return (NULL);
1999 cp = strchr(line, '\n');
2000 if (cp)
2001 *cp = '\0';
2002 return (line);
2003 }
2004
2005 char *
2006 newstr(const char *cp)
2007 {
2008 char *cr;
2009
2010 if ((cr = strdup(cp != NULL ? cp : "")))
2011 return (cr);
2012 syslog(LOG_ERR, "strdup: %m");
2013 exit(EX_OSERR);
2014 }
2015
2016 void
2017 inetd_setproctitle(const char *a, int s)
2018 {
2019 socklen_t size;
2020 struct sockaddr_storage ss;
2021 char buf[80], pbuf[INET6_ADDRSTRLEN];
2022
2023 size = sizeof(ss);
2024 if (getpeername(s, (struct sockaddr *)&ss, &size) == 0) {
2025 getnameinfo((struct sockaddr *)&ss, size, pbuf, sizeof(pbuf),
2026 NULL, 0, NI_NUMERICHOST|NI_WITHSCOPEID);
2027 sprintf(buf, "%s [%s]", a, pbuf);
2028 } else
2029 sprintf(buf, "%s", a);
2030 setproctitle("%s", buf);
2031 }
2032
2033 int
2034 check_loop(const struct sockaddr *sa, const struct servtab *sep)
2035 {
2036 struct servtab *se2;
2037 char pname[INET6_ADDRSTRLEN];
2038
2039 for (se2 = servtab; se2; se2 = se2->se_next) {
2040 if (!se2->se_bi || se2->se_socktype != SOCK_DGRAM)
2041 continue;
2042
2043 switch (se2->se_family) {
2044 case AF_INET:
2045 if (((const struct sockaddr_in *)sa)->sin_port ==
2046 se2->se_ctrladdr4.sin_port)
2047 goto isloop;
2048 continue;
2049 #ifdef INET6
2050 case AF_INET6:
2051 if (((const struct sockaddr_in *)sa)->sin_port ==
2052 se2->se_ctrladdr4.sin_port)
2053 goto isloop;
2054 continue;
2055 #endif
2056 default:
2057 continue;
2058 }
2059 isloop:
2060 getnameinfo(sa, sa->sa_len, pname, sizeof(pname), NULL, 0,
2061 NI_NUMERICHOST|NI_WITHSCOPEID);
2062 syslog(LOG_WARNING, "%s/%s:%s/%s loop request REFUSED from %s",
2063 sep->se_service, sep->se_proto,
2064 se2->se_service, se2->se_proto,
2065 pname);
2066 return 1;
2067 }
2068 return 0;
2069 }
2070
2071 /*
2072 * print_service:
2073 * Dump relevant information to stderr
2074 */
2075 void
2076 print_service(const char *action, const struct servtab *sep)
2077 {
2078 fprintf(stderr,
2079 "%s: %s proto=%s accept=%d max=%d user=%s group=%s"
2080 #ifdef LOGIN_CAP
2081 "class=%s"
2082 #endif
2083 " builtin=%p server=%s"
2084 #ifdef IPSEC
2085 " policy=\"%s\""
2086 #endif
2087 "\n",
2088 action, sep->se_service, sep->se_proto,
2089 sep->se_accept, sep->se_maxchild, sep->se_user, sep->se_group,
2090 #ifdef LOGIN_CAP
2091 sep->se_class,
2092 #endif
2093 (void *) sep->se_bi, sep->se_server
2094 #ifdef IPSEC
2095 , (sep->se_policy ? sep->se_policy : "")
2096 #endif
2097 );
2098 }
2099
2100 #define CPMHSIZE 256
2101 #define CPMHMASK (CPMHSIZE-1)
2102 #define CHTGRAN 10
2103 #define CHTSIZE 6
2104
2105 typedef struct CTime {
2106 unsigned long ct_Ticks;
2107 int ct_Count;
2108 } CTime;
2109
2110 typedef struct CHash {
2111 union {
2112 struct in_addr c4_Addr;
2113 struct in6_addr c6_Addr;
2114 } cu_Addr;
2115 #define ch_Addr4 cu_Addr.c4_Addr
2116 #define ch_Addr6 cu_Addr.c6_Addr
2117 int ch_Family;
2118 time_t ch_LTime;
2119 char *ch_Service;
2120 CTime ch_Times[CHTSIZE];
2121 } CHash;
2122
2123 CHash CHashAry[CPMHSIZE];
2124
2125 int
2126 cpmip(const struct servtab *sep, int ctrl)
2127 {
2128 struct sockaddr_storage rss;
2129 socklen_t rssLen = sizeof(rss);
2130 int r = 0;
2131
2132 /*
2133 * If getpeername() fails, just let it through (if logging is
2134 * enabled the condition is caught elsewhere)
2135 */
2136
2137 if (sep->se_maxcpm > 0 &&
2138 getpeername(ctrl, (struct sockaddr *)&rss, &rssLen) == 0 ) {
2139 time_t t = time(NULL);
2140 int hv = 0xABC3D20F;
2141 int i;
2142 int cnt = 0;
2143 CHash *chBest = NULL;
2144 unsigned int ticks = t / CHTGRAN;
2145 struct sockaddr_in *sin4;
2146 #ifdef INET6
2147 struct sockaddr_in6 *sin6;
2148 #endif
2149
2150 sin4 = (struct sockaddr_in *)&rss;
2151 #ifdef INET6
2152 sin6 = (struct sockaddr_in6 *)&rss;
2153 #endif
2154 {
2155 char *p;
2156 int addrlen;
2157
2158 switch (rss.ss_family) {
2159 case AF_INET:
2160 p = (char *)&sin4->sin_addr;
2161 addrlen = sizeof(struct in_addr);
2162 break;
2163 #ifdef INET6
2164 case AF_INET6:
2165 p = (char *)&sin6->sin6_addr;
2166 addrlen = sizeof(struct in6_addr);
2167 break;
2168 #endif
2169 default:
2170 /* should not happen */
2171 return -1;
2172 }
2173
2174 for (i = 0; i < addrlen; ++i, ++p) {
2175 hv = (hv << 5) ^ (hv >> 23) ^ *p;
2176 }
2177 hv = (hv ^ (hv >> 16));
2178 }
2179 for (i = 0; i < 5; ++i) {
2180 CHash *ch = &CHashAry[(hv + i) & CPMHMASK];
2181
2182 if (rss.ss_family == AF_INET &&
2183 ch->ch_Family == AF_INET &&
2184 sin4->sin_addr.s_addr == ch->ch_Addr4.s_addr &&
2185 ch->ch_Service && strcmp(sep->se_service,
2186 ch->ch_Service) == 0) {
2187 chBest = ch;
2188 break;
2189 }
2190 #ifdef INET6
2191 if (rss.ss_family == AF_INET6 &&
2192 ch->ch_Family == AF_INET6 &&
2193 IN6_ARE_ADDR_EQUAL(&sin6->sin6_addr,
2194 &ch->ch_Addr6) != 0 &&
2195 ch->ch_Service && strcmp(sep->se_service,
2196 ch->ch_Service) == 0) {
2197 chBest = ch;
2198 break;
2199 }
2200 #endif
2201 if (chBest == NULL || ch->ch_LTime == 0 ||
2202 ch->ch_LTime < chBest->ch_LTime) {
2203 chBest = ch;
2204 }
2205 }
2206 if ((rss.ss_family == AF_INET &&
2207 (chBest->ch_Family != AF_INET ||
2208 sin4->sin_addr.s_addr != chBest->ch_Addr4.s_addr)) ||
2209 chBest->ch_Service == NULL ||
2210 strcmp(sep->se_service, chBest->ch_Service) != 0) {
2211 chBest->ch_Family = sin4->sin_family;
2212 chBest->ch_Addr4 = sin4->sin_addr;
2213 if (chBest->ch_Service)
2214 free(chBest->ch_Service);
2215 chBest->ch_Service = strdup(sep->se_service);
2216 bzero(chBest->ch_Times, sizeof(chBest->ch_Times));
2217 }
2218 #ifdef INET6
2219 if ((rss.ss_family == AF_INET6 &&
2220 (chBest->ch_Family != AF_INET6 ||
2221 IN6_ARE_ADDR_EQUAL(&sin6->sin6_addr,
2222 &chBest->ch_Addr6) == 0)) ||
2223 chBest->ch_Service == NULL ||
2224 strcmp(sep->se_service, chBest->ch_Service) != 0) {
2225 chBest->ch_Family = sin6->sin6_family;
2226 chBest->ch_Addr6 = sin6->sin6_addr;
2227 if (chBest->ch_Service)
2228 free(chBest->ch_Service);
2229 chBest->ch_Service = strdup(sep->se_service);
2230 bzero(chBest->ch_Times, sizeof(chBest->ch_Times));
2231 }
2232 #endif
2233 chBest->ch_LTime = t;
2234 {
2235 CTime *ct = &chBest->ch_Times[ticks % CHTSIZE];
2236 if (ct->ct_Ticks != ticks) {
2237 ct->ct_Ticks = ticks;
2238 ct->ct_Count = 0;
2239 }
2240 ++ct->ct_Count;
2241 }
2242 for (i = 0; i < CHTSIZE; ++i) {
2243 CTime *ct = &chBest->ch_Times[i];
2244 if (ct->ct_Ticks <= ticks &&
2245 ct->ct_Ticks >= ticks - CHTSIZE) {
2246 cnt += ct->ct_Count;
2247 }
2248 }
2249 if (cnt * (CHTSIZE * CHTGRAN) / 60 > sep->se_maxcpm) {
2250 char pname[INET6_ADDRSTRLEN];
2251
2252 getnameinfo((struct sockaddr *)&rss,
2253 ((struct sockaddr *)&rss)->sa_len,
2254 pname, sizeof(pname), NULL, 0,
2255 NI_NUMERICHOST|NI_WITHSCOPEID);
2256 r = -1;
2257 syslog(LOG_ERR,
2258 "%s from %s exceeded counts/min (limit %d/min)",
2259 sep->se_service, pname,
2260 sep->se_maxcpm);
2261 }
2262 }
2263 return(r);
2264 }
2265
2266 static struct conninfo *
2267 search_conn(struct servtab *sep, int ctrl)
2268 {
2269 struct sockaddr_storage ss;
2270 socklen_t sslen = sizeof(ss);
2271 struct conninfo *conn;
2272 int hv;
2273 char pname[NI_MAXHOST], pname2[NI_MAXHOST];
2274
2275 if (sep->se_maxperip <= 0)
2276 return NULL;
2277
2278 /*
2279 * If getpeername() fails, just let it through (if logging is
2280 * enabled the condition is caught elsewhere)
2281 */
2282 if (getpeername(ctrl, (struct sockaddr *)&ss, &sslen) != 0)
2283 return NULL;
2284
2285 switch (ss.ss_family) {
2286 case AF_INET:
2287 hv = hashval((char *)&((struct sockaddr_in *)&ss)->sin_addr,
2288 sizeof(struct in_addr));
2289 break;
2290 #ifdef INET6
2291 case AF_INET6:
2292 hv = hashval((char *)&((struct sockaddr_in6 *)&ss)->sin6_addr,
2293 sizeof(struct in6_addr));
2294 break;
2295 #endif
2296 default:
2297 /*
2298 * Since we only support AF_INET and AF_INET6, just
2299 * let other than AF_INET and AF_INET6 through.
2300 */
2301 return NULL;
2302 }
2303
2304 if (getnameinfo((struct sockaddr *)&ss, sslen, pname, sizeof(pname),
2305 NULL, 0, NI_NUMERICHOST | NI_WITHSCOPEID) != 0)
2306 return NULL;
2307
2308 LIST_FOREACH(conn, &sep->se_conn[hv], co_link) {
2309 if (getnameinfo((struct sockaddr *)&conn->co_addr,
2310 conn->co_addr.ss_len, pname2, sizeof(pname2), NULL, 0,
2311 NI_NUMERICHOST | NI_WITHSCOPEID) == 0 &&
2312 strcmp(pname, pname2) == 0)
2313 break;
2314 }
2315
2316 if (conn == NULL) {
2317 if ((conn = malloc(sizeof(struct conninfo))) == NULL) {
2318 syslog(LOG_ERR, "malloc: %m");
2319 exit(EX_OSERR);
2320 }
2321 conn->co_proc = malloc(sep->se_maxperip * sizeof(*conn->co_proc));
2322 if (conn->co_proc == NULL) {
2323 syslog(LOG_ERR, "malloc: %m");
2324 exit(EX_OSERR);
2325 }
2326 memcpy(&conn->co_addr, (struct sockaddr *)&ss, sslen);
2327 conn->co_numchild = 0;
2328 LIST_INSERT_HEAD(&sep->se_conn[hv], conn, co_link);
2329 }
2330
2331 /*
2332 * Since a child process is not invoked yet, we cannot
2333 * determine a pid of a child. So, co_proc and co_numchild
2334 * should be filled leter.
2335 */
2336
2337 return conn;
2338 }
2339
2340 static int
2341 room_conn(struct servtab *sep, struct conninfo *conn)
2342 {
2343 char pname[NI_MAXHOST];
2344
2345 if (conn->co_numchild >= sep->se_maxperip) {
2346 getnameinfo((struct sockaddr *)&conn->co_addr,
2347 conn->co_addr.ss_len, pname, sizeof(pname), NULL, 0,
2348 NI_NUMERICHOST | NI_WITHSCOPEID);
2349 syslog(LOG_ERR, "%s from %s exceeded counts (limit %d)",
2350 sep->se_service, pname, sep->se_maxperip);
2351 return 0;
2352 }
2353 return 1;
2354 }
2355
2356 static void
2357 addchild_conn(struct conninfo *conn, pid_t pid)
2358 {
2359 struct procinfo *proc;
2360
2361 if (conn == NULL)
2362 return;
2363
2364 if ((proc = search_proc(pid, 1)) != NULL) {
2365 if (proc->pr_conn != NULL) {
2366 syslog(LOG_ERR,
2367 "addchild_conn: child already on process list");
2368 exit(EX_OSERR);
2369 }
2370 proc->pr_conn = conn;
2371 }
2372
2373 conn->co_proc[conn->co_numchild++] = proc;
2374 }
2375
2376 static void
2377 reapchild_conn(pid_t pid)
2378 {
2379 struct procinfo *proc;
2380 struct conninfo *conn;
2381 int i;
2382
2383 if ((proc = search_proc(pid, 0)) == NULL)
2384 return;
2385 if ((conn = proc->pr_conn) == NULL)
2386 return;
2387 for (i = 0; i < conn->co_numchild; ++i)
2388 if (conn->co_proc[i] == proc) {
2389 conn->co_proc[i] = conn->co_proc[--conn->co_numchild];
2390 break;
2391 }
2392 free_proc(proc);
2393 free_conn(conn);
2394 }
2395
2396 static void
2397 resize_conn(struct servtab *sep, int maxpip)
2398 {
2399 struct conninfo *conn;
2400 int i, j;
2401
2402 if (sep->se_maxperip <= 0)
2403 return;
2404 if (maxpip <= 0) {
2405 free_connlist(sep);
2406 return;
2407 }
2408 for (i = 0; i < PERIPSIZE; ++i) {
2409 LIST_FOREACH(conn, &sep->se_conn[i], co_link) {
2410 for (j = maxpip; j < conn->co_numchild; ++j)
2411 free_proc(conn->co_proc[j]);
2412 conn->co_proc = realloc(conn->co_proc,
2413 maxpip * sizeof(*conn->co_proc));
2414 if (conn->co_proc == NULL) {
2415 syslog(LOG_ERR, "realloc: %m");
2416 exit(EX_OSERR);
2417 }
2418 if (conn->co_numchild > maxpip)
2419 conn->co_numchild = maxpip;
2420 }
2421 }
2422 }
2423
2424 static void
2425 free_connlist(struct servtab *sep)
2426 {
2427 struct conninfo *conn;
2428 int i, j;
2429
2430 for (i = 0; i < PERIPSIZE; ++i) {
2431 while ((conn = LIST_FIRST(&sep->se_conn[i])) != NULL) {
2432 for (j = 0; j < conn->co_numchild; ++j)
2433 free_proc(conn->co_proc[j]);
2434 conn->co_numchild = 0;
2435 free_conn(conn);
2436 }
2437 }
2438 }
2439
2440 static void
2441 free_conn(struct conninfo *conn)
2442 {
2443 if (conn == NULL)
2444 return;
2445 if (conn->co_numchild <= 0) {
2446 LIST_REMOVE(conn, co_link);
2447 free(conn->co_proc);
2448 free(conn);
2449 }
2450 }
2451
2452 static struct procinfo *
2453 search_proc(pid_t pid, int add)
2454 {
2455 struct procinfo *proc;
2456 int hv;
2457
2458 hv = hashval((char *)&pid, sizeof(pid));
2459 LIST_FOREACH(proc, &proctable[hv], pr_link) {
2460 if (proc->pr_pid == pid)
2461 break;
2462 }
2463 if (proc == NULL && add) {
2464 if ((proc = malloc(sizeof(struct procinfo))) == NULL) {
2465 syslog(LOG_ERR, "malloc: %m");
2466 exit(EX_OSERR);
2467 }
2468 proc->pr_pid = pid;
2469 proc->pr_conn = NULL;
2470 LIST_INSERT_HEAD(&proctable[hv], proc, pr_link);
2471 }
2472 return proc;
2473 }
2474
2475 static void
2476 free_proc(struct procinfo *proc)
2477 {
2478 if (proc == NULL)
2479 return;
2480 LIST_REMOVE(proc, pr_link);
2481 free(proc);
2482 }
2483
2484 static int
2485 hashval(char *p, int len)
2486 {
2487 int i, hv = 0xABC3D20F;
2488
2489 for (i = 0; i < len; ++i, ++p)
2490 hv = (hv << 5) ^ (hv >> 23) ^ *p;
2491 hv = (hv ^ (hv >> 16)) & (PERIPSIZE - 1);
2492 return hv;
2493 }
DragonFly BSD