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kernel - TMPFS - Bug fixing pass
[dragonfly.git] / usr.sbin / inetd / inetd.c
blob8bf3f933419247ba62a4c6a8bc24db0ca56f5d6b
1 /*
2 * Copyright (c) 1983, 1991, 1993, 1994
3 * The Regents of the University of California. All rights reserved.
4 *
5 * Redistribution and use in source and binary forms, with or without
6 * modification, are permitted provided that the following conditions
7 * are met:
8 * 1. Redistributions of source code must retain the above copyright
9 * notice, this list of conditions and the following disclaimer.
10 * 2. Redistributions in binary form must reproduce the above copyright
11 * notice, this list of conditions and the following disclaimer in the
12 * documentation and/or other materials provided with the distribution.
13 * 3. All advertising materials mentioning features or use of this software
14 * must display the following acknowledgement:
15 * This product includes software developed by the University of
16 * California, Berkeley and its contributors.
17 * 4. Neither the name of the University nor the names of its contributors
18 * may be used to endorse or promote products derived from this software
19 * without specific prior written permission.
20 *
21 * THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND
22 * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
23 * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
24 * ARE DISCLAIMED. IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE
25 * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
26 * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
27 * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
28 * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
29 * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
30 * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
31 * SUCH DAMAGE.
32 *
33 * @(#) Copyright (c) 1983, 1991, 1993, 1994 The Regents of the University of California. All rights reserved.
34 * @(#)from: inetd.c 8.4 (Berkeley) 4/13/94
35 * $FreeBSD: src/usr.sbin/inetd/inetd.c,v 1.80.2.11 2003/04/05 13:39:18 dwmalone Exp $
36 * $DragonFly: src/usr.sbin/inetd/inetd.c,v 1.11 2008/05/23 23:40:59 swildner Exp $
37 */
38
39 /*
40 * Inetd - Internet super-server
41 *
42 * This program invokes all internet services as needed. Connection-oriented
43 * services are invoked each time a connection is made, by creating a process.
44 * This process is passed the connection as file descriptor 0 and is expected
45 * to do a getpeername to find out the source host and port.
46 *
47 * Datagram oriented services are invoked when a datagram
48 * arrives; a process is created and passed a pending message
49 * on file descriptor 0. Datagram servers may either connect
50 * to their peer, freeing up the original socket for inetd
51 * to receive further messages on, or ``take over the socket'',
52 * processing all arriving datagrams and, eventually, timing
53 * out. The first type of server is said to be ``multi-threaded'';
54 * the second type of server ``single-threaded''.
55 *
56 * Inetd uses a configuration file which is read at startup
57 * and, possibly, at some later time in response to a hangup signal.
58 * The configuration file is ``free format'' with fields given in the
59 * order shown below. Continuation lines for an entry must begin with
60 * a space or tab. All fields must be present in each entry.
61 *
62 * service name must be in /etc/services
63 * or name a tcpmux service
64 * or specify a unix domain socket
65 * socket type stream/dgram/raw/rdm/seqpacket
66 * protocol tcp[4][6][/faith,ttcp], udp[4][6], unix
67 * wait/nowait single-threaded/multi-threaded
68 * user user to run daemon as
69 * server program full path name
70 * server program arguments maximum of MAXARGS (20)
71 *
72 * TCP services without official port numbers are handled with the
73 * RFC1078-based tcpmux internal service. Tcpmux listens on port 1 for
74 * requests. When a connection is made from a foreign host, the service
75 * requested is passed to tcpmux, which looks it up in the servtab list
76 * and returns the proper entry for the service. Tcpmux returns a
77 * negative reply if the service doesn't exist, otherwise the invoked
78 * server is expected to return the positive reply if the service type in
79 * inetd.conf file has the prefix "tcpmux/". If the service type has the
80 * prefix "tcpmux/+", tcpmux will return the positive reply for the
81 * process; this is for compatibility with older server code, and also
82 * allows you to invoke programs that use stdin/stdout without putting any
83 * special server code in them. Services that use tcpmux are "nowait"
84 * because they do not have a well-known port and hence cannot listen
85 * for new requests.
86 *
87 * For RPC services
88 * service name/version must be in /etc/rpc
89 * socket type stream/dgram/raw/rdm/seqpacket
90 * protocol rpc/tcp, rpc/udp
91 * wait/nowait single-threaded/multi-threaded
92 * user user to run daemon as
93 * server program full path name
94 * server program arguments maximum of MAXARGS
95 *
96 * Comment lines are indicated by a `#' in column 1.
97 *
98 * #ifdef IPSEC
99 * Comment lines that start with "#@" denote IPsec policy string, as described
100 * in ipsec_set_policy(3). This will affect all the following items in
101 * inetd.conf(8). To reset the policy, just use "#@" line. By default,
102 * there's no IPsec policy.
103 * #endif
104 */
105 #include <sys/param.h>
106 #include <sys/ioctl.h>
107 #include <sys/wait.h>
108 #include <sys/time.h>
109 #include <sys/resource.h>
110 #include <sys/stat.h>
111 #include <sys/un.h>
112
113 #include <netinet/in.h>
114 #include <netinet/tcp.h>
115 #include <arpa/inet.h>
116 #include <rpc/rpc.h>
117 #include <rpc/pmap_clnt.h>
118
119 #include <errno.h>
120 #include <err.h>
121 #include <fcntl.h>
122 #include <grp.h>
123 #include <limits.h>
124 #include <netdb.h>
125 #include <pwd.h>
126 #include <signal.h>
127 #include <stdio.h>
128 #include <stdlib.h>
129 #include <string.h>
130 #include <syslog.h>
131 #include <tcpd.h>
132 #include <unistd.h>
133 #include <libutil.h>
134 #include <sysexits.h>
135 #include <ctype.h>
136
137 #include "inetd.h"
138 #include "pathnames.h"
139
140 #ifdef IPSEC
141 #include <netinet6/ipsec.h>
142 #ifndef IPSEC_POLICY_IPSEC /* no ipsec support on old ipsec */
143 #undef IPSEC
144 #endif
145 #endif
146
147 /* wrapper for KAME-special getnameinfo() */
148 #ifndef NI_WITHSCOPEID
149 #define NI_WITHSCOPEID 0
150 #endif
151
152 #ifndef LIBWRAP_ALLOW_FACILITY
153 # define LIBWRAP_ALLOW_FACILITY LOG_AUTH
154 #endif
155 #ifndef LIBWRAP_ALLOW_SEVERITY
156 # define LIBWRAP_ALLOW_SEVERITY LOG_INFO
157 #endif
158 #ifndef LIBWRAP_DENY_FACILITY
159 # define LIBWRAP_DENY_FACILITY LOG_AUTH
160 #endif
161 #ifndef LIBWRAP_DENY_SEVERITY
162 # define LIBWRAP_DENY_SEVERITY LOG_WARNING
163 #endif
164
165 #define ISWRAP(sep) \
166 ( ((wrap_ex && !(sep)->se_bi) || (wrap_bi && (sep)->se_bi)) \
167 && (sep->se_family == AF_INET || sep->se_family == AF_INET6) \
168 && ( ((sep)->se_accept && (sep)->se_socktype == SOCK_STREAM) \
169 || (sep)->se_socktype == SOCK_DGRAM))
170
171 #ifdef LOGIN_CAP
172 #include <login_cap.h>
173
174 /* see init.c */
175 #define RESOURCE_RC "daemon"
176
177 #endif
178
179 #ifndef MAXCHILD
180 #define MAXCHILD -1 /* maximum number of this service
181 < 0 = no limit */
182 #endif
183
184 #ifndef MAXCPM
185 #define MAXCPM -1 /* rate limit invocations from a
186 single remote address,
187 < 0 = no limit */
188 #endif
189
190 #ifndef MAXPERIP
191 #define MAXPERIP -1 /* maximum number of this service
192 from a single remote address,
193 < 0 = no limit */
194 #endif
195
196 #ifndef TOOMANY
197 #define TOOMANY 256 /* don't start more than TOOMANY */
198 #endif
199 #define CNT_INTVL 60 /* servers in CNT_INTVL sec. */
200 #define RETRYTIME (60*10) /* retry after bind or server fail */
201 #define MAX_MAXCHLD 32767 /* max allowable max children */
202
203 #define SIGBLOCK (sigmask(SIGCHLD)|sigmask(SIGHUP)|sigmask(SIGALRM))
204
205 void close_sep(struct servtab *);
206 void flag_signal(int);
207 void flag_config(int);
208 void config(void);
209 int cpmip(const struct servtab *, int);
210 void endconfig(void);
211 struct servtab *enter(struct servtab *);
212 void freeconfig(struct servtab *);
213 struct servtab *getconfigent(void);
214 int matchservent(const char *, const char *, const char *);
215 char *nextline(FILE *);
216 void addchild(struct servtab *, int);
217 void flag_reapchild(int);
218 void reapchild(void);
219 void enable(struct servtab *);
220 void disable(struct servtab *);
221 void flag_retry(int);
222 void retry(void);
223 int setconfig(void);
224 void setup(struct servtab *);
225 #ifdef IPSEC
226 void ipsecsetup(struct servtab *);
227 #endif
228 void unregisterrpc(struct servtab *sep);
229 static struct conninfo *search_conn(struct servtab *sep, int ctrl);
230 static int room_conn(struct servtab *sep, struct conninfo *conn);
231 static void addchild_conn(struct conninfo *conn, pid_t pid);
232 static void reapchild_conn(pid_t pid);
233 static void free_conn(struct conninfo *conn);
234 static void resize_conn(struct servtab *sep, int maxperip);
235 static void free_connlist(struct servtab *sep);
236 static void free_proc(struct procinfo *);
237 static struct procinfo *search_proc(pid_t pid, int add);
238 static int hashval(char *p, int len);
239
240 int allow_severity;
241 int deny_severity;
242 int wrap_ex = 0;
243 int wrap_bi = 0;
244 int debug = 0;
245 int dolog = 0;
246 int maxsock; /* highest-numbered descriptor */
247 fd_set allsock;
248 int options;
249 int timingout;
250 int toomany = TOOMANY;
251 int maxchild = MAXCHILD;
252 int maxcpm = MAXCPM;
253 int maxperip = MAXPERIP;
254 struct servent *sp;
255 struct rpcent *rpc;
256 char *hostname = NULL;
257 struct sockaddr_in *bind_sa4;
258 int no_v4bind = 1;
259 #ifdef INET6
260 struct sockaddr_in6 *bind_sa6;
261 int no_v6bind = 1;
262 #endif
263 int signalpipe[2];
264 #ifdef SANITY_CHECK
265 int nsock;
266 #endif
267 uid_t euid;
268 gid_t egid;
269 mode_t mask;
270
271 struct servtab *servtab;
272
273 extern struct biltin biltins[];
274
275 #define NUMINT (sizeof(intab) / sizeof(struct inent))
276 const char *CONFIG = _PATH_INETDCONF;
277 const char *pid_file = _PATH_INETDPID;
278
279 static LIST_HEAD(, procinfo) proctable[PERIPSIZE];
280
281 int
282 getvalue(const char *arg, int *value, const char *whine)
283 {
284 int tmp;
285 char *p;
286
287 tmp = strtol(arg, &p, 0);
288 if (tmp < 0 || *p) {
289 syslog(LOG_ERR, whine, arg);
290 return 1; /* failure */
291 }
292 *value = tmp;
293 return 0; /* success */
294 }
295
296 static sa_family_t
297 whichaf(struct request_info *req)
298 {
299 struct sockaddr *sa;
300
301 sa = (struct sockaddr *)req->client->sin;
302 if (sa == NULL)
303 return AF_UNSPEC;
304 if (sa->sa_family == AF_INET6 &&
305 IN6_IS_ADDR_V4MAPPED(&((struct sockaddr_in6 *)sa)->sin6_addr))
306 return AF_INET;
307 return sa->sa_family;
308 }
309
310 int
311 main(int argc, char **argv)
312 {
313 struct servtab *sep;
314 struct passwd *pwd;
315 struct group *grp;
316 struct sigaction sa, saalrm, sachld, sahup, sapipe;
317 int ch, dofork;
318 pid_t pid;
319 char buf[50];
320 #ifdef LOGIN_CAP
321 login_cap_t *lc = NULL;
322 #endif
323 struct request_info req;
324 int denied;
325 char *service = NULL;
326 union {
327 struct sockaddr peer_un;
328 struct sockaddr_in peer_un4;
329 struct sockaddr_in6 peer_un6;
330 struct sockaddr_storage peer_max;
331 } p_un;
332 #define peer p_un.peer_un
333 #define peer4 p_un.peer_un4
334 #define peer6 p_un.peer_un6
335 #define peermax p_un.peer_max
336 int i;
337 struct addrinfo hints, *res;
338 const char *servname;
339 int error;
340 struct conninfo *conn;
341
342 openlog("inetd", LOG_PID | LOG_NOWAIT | LOG_PERROR, LOG_DAEMON);
343
344 while ((ch = getopt(argc, argv, "dlwWR:a:c:C:p:s:")) != -1)
345 switch(ch) {
346 case 'd':
347 debug = 1;
348 options |= SO_DEBUG;
349 break;
350 case 'l':
351 dolog = 1;
352 break;
353 case 'R':
354 getvalue(optarg, &toomany,
355 "-R %s: bad value for service invocation rate");
356 break;
357 case 'c':
358 getvalue(optarg, &maxchild,
359 "-c %s: bad value for maximum children");
360 break;
361 case 'C':
362 getvalue(optarg, &maxcpm,
363 "-C %s: bad value for maximum children/minute");
364 break;
365 case 'a':
366 hostname = optarg;
367 break;
368 case 'p':
369 pid_file = optarg;
370 break;
371 case 's':
372 getvalue(optarg, &maxperip,
373 "-s %s: bad value for maximum children per source address");
374 break;
375 case 'w':
376 wrap_ex++;
377 break;
378 case 'W':
379 wrap_bi++;
380 break;
381 case '?':
382 default:
383 syslog(LOG_ERR,
384 "usage: inetd [-dlwW] [-a address] [-R rate]"
385 " [-c maximum] [-C rate]"
386 " [-p pidfile] [conf-file]");
387 exit(EX_USAGE);
388 }
389 /*
390 * Initialize Bind Addrs.
391 * When hostname is NULL, wild card bind addrs are obtained from
392 * getaddrinfo(). But getaddrinfo() requires at least one of
393 * hostname or servname is non NULL.
394 * So when hostname is NULL, set dummy value to servname.
395 */
396 servname = (hostname == NULL) ? "discard" /* dummy */ : NULL;
397
398 bzero(&hints, sizeof(struct addrinfo));
399 hints.ai_flags = AI_PASSIVE;
400 hints.ai_family = AF_UNSPEC;
401 error = getaddrinfo(hostname, servname, &hints, &res);
402 if (error != 0) {
403 syslog(LOG_ERR, "-a %s: %s", hostname, gai_strerror(error));
404 if (error == EAI_SYSTEM)
405 syslog(LOG_ERR, "%s", strerror(errno));
406 exit(EX_USAGE);
407 }
408 do {
409 if (res->ai_addr == NULL) {
410 syslog(LOG_ERR, "-a %s: getaddrinfo failed", hostname);
411 exit(EX_USAGE);
412 }
413 switch (res->ai_addr->sa_family) {
414 case AF_INET:
415 if (no_v4bind == 0)
416 continue;
417 bind_sa4 = (struct sockaddr_in *)res->ai_addr;
418 /* init port num in case servname is dummy */
419 bind_sa4->sin_port = 0;
420 no_v4bind = 0;
421 continue;
422 #ifdef INET6
423 case AF_INET6:
424 if (no_v6bind == 0)
425 continue;
426 bind_sa6 = (struct sockaddr_in6 *)res->ai_addr;
427 /* init port num in case servname is dummy */
428 bind_sa6->sin6_port = 0;
429 no_v6bind = 0;
430 continue;
431 #endif
432 }
433 if (no_v4bind == 0
434 #ifdef INET6
435 && no_v6bind == 0
436 #endif
437 )
438 break;
439 } while ((res = res->ai_next) != NULL);
440 if (no_v4bind != 0
441 #ifdef INET6
442 && no_v6bind != 0
443 #endif
444 ) {
445 syslog(LOG_ERR, "-a %s: unknown address family", hostname);
446 exit(EX_USAGE);
447 }
448
449 euid = geteuid();
450 egid = getegid();
451 umask(mask = umask(0777));
452
453 argc -= optind;
454 argv += optind;
455
456 if (argc > 0)
457 CONFIG = argv[0];
458 if (debug == 0) {
459 FILE *fp;
460 if (daemon(0, 0) < 0) {
461 syslog(LOG_WARNING, "daemon(0,0) failed: %m");
462 }
463 /* From now on we don't want syslog messages going to stderr. */
464 closelog();
465 openlog("inetd", LOG_PID | LOG_NOWAIT, LOG_DAEMON);
466 /*
467 * In case somebody has started inetd manually, we need to
468 * clear the logname, so that old servers run as root do not
469 * get the user's logname..
470 */
471 if (setlogin("") < 0) {
472 syslog(LOG_WARNING, "cannot clear logname: %m");
473 /* no big deal if it fails.. */
474 }
475 pid = getpid();
476 fp = fopen(pid_file, "w");
477 if (fp) {
478 fprintf(fp, "%ld\n", (long)pid);
479 fclose(fp);
480 } else {
481 syslog(LOG_WARNING, "%s: %m", pid_file);
482 }
483 }
484 for (i = 0; i < PERIPSIZE; ++i)
485 LIST_INIT(&proctable[i]);
486 sa.sa_flags = 0;
487 sigemptyset(&sa.sa_mask);
488 sigaddset(&sa.sa_mask, SIGALRM);
489 sigaddset(&sa.sa_mask, SIGCHLD);
490 sigaddset(&sa.sa_mask, SIGHUP);
491 sa.sa_handler = flag_retry;
492 sigaction(SIGALRM, &sa, &saalrm);
493 config();
494 sa.sa_handler = flag_config;
495 sigaction(SIGHUP, &sa, &sahup);
496 sa.sa_handler = flag_reapchild;
497 sigaction(SIGCHLD, &sa, &sachld);
498 sa.sa_handler = SIG_IGN;
499 sigaction(SIGPIPE, &sa, &sapipe);
500
501 {
502 /* space for daemons to overwrite environment for ps */
503 #define DUMMYSIZE 100
504 char dummy[DUMMYSIZE];
505
506 memset(dummy, 'x', DUMMYSIZE - 1);
507 dummy[DUMMYSIZE - 1] = '\0';
508 if (setenv("inetd_dummy", dummy, 1) == -1)
509 syslog(LOG_WARNING, "setenv: cannot set inetd_dummy=%s: %m", dummy);
510
511 }
512
513 if (pipe(signalpipe) != 0) {
514 syslog(LOG_ERR, "pipe: %m");
515 exit(EX_OSERR);
516 }
517 if (fcntl(signalpipe[0], F_SETFD, FD_CLOEXEC) < 0 ||
518 fcntl(signalpipe[1], F_SETFD, FD_CLOEXEC) < 0) {
519 syslog(LOG_ERR, "signalpipe: fcntl (F_SETFD, FD_CLOEXEC): %m");
520 exit(EX_OSERR);
521 }
522 FD_SET(signalpipe[0], &allsock);
523 #ifdef SANITY_CHECK
524 nsock++;
525 #endif
526 if (signalpipe[0] > maxsock)
527 maxsock = signalpipe[0];
528 if (signalpipe[1] > maxsock)
529 maxsock = signalpipe[1];
530
531 for (;;) {
532 int n, ctrl;
533 fd_set readable;
534
535 #ifdef SANITY_CHECK
536 if (nsock == 0) {
537 syslog(LOG_ERR, "%s: nsock=0", __func__);
538 exit(EX_SOFTWARE);
539 }
540 #endif
541 readable = allsock;
542 if ((n = select(maxsock + 1, &readable, NULL, NULL, NULL)) <= 0) {
543 if (n < 0 && errno != EINTR) {
544 syslog(LOG_WARNING, "select: %m");
545 sleep(1);
546 }
547 continue;
548 }
549 /* handle any queued signal flags */
550 if (FD_ISSET(signalpipe[0], &readable)) {
551 int nsig;
552 if (ioctl(signalpipe[0], FIONREAD, &nsig) != 0) {
553 syslog(LOG_ERR, "ioctl: %m");
554 exit(EX_OSERR);
555 }
556 while (--nsig >= 0) {
557 char c;
558 if (read(signalpipe[0], &c, 1) != 1) {
559 syslog(LOG_ERR, "read: %m");
560 exit(EX_OSERR);
561 }
562 if (debug)
563 warnx("handling signal flag %c", c);
564 switch(c) {
565 case 'A': /* sigalrm */
566 retry();
567 break;
568 case 'C': /* sigchld */
569 reapchild();
570 break;
571 case 'H': /* sighup */
572 config();
573 break;
574 }
575 }
576 }
577 for (sep = servtab; n && sep; sep = sep->se_next)
578 if (sep->se_fd != -1 && FD_ISSET(sep->se_fd, &readable)) {
579 n--;
580 if (debug)
581 warnx("someone wants %s", sep->se_service);
582 dofork = !sep->se_bi || sep->se_bi->bi_fork || ISWRAP(sep);
583 conn = NULL;
584 if (sep->se_accept && sep->se_socktype == SOCK_STREAM) {
585 i = 1;
586 if (ioctl(sep->se_fd, FIONBIO, &i) < 0)
587 syslog(LOG_ERR, "ioctl (FIONBIO, 1): %m");
588 ctrl = accept(sep->se_fd, NULL, NULL);
589 if (debug)
590 warnx("accept, ctrl %d", ctrl);
591 if (ctrl < 0) {
592 if (errno != EINTR)
593 syslog(LOG_WARNING,
594 "accept (for %s): %m",
595 sep->se_service);
596 if (sep->se_accept &&
597 sep->se_socktype == SOCK_STREAM)
598 close(ctrl);
599 continue;
600 }
601 i = 0;
602 if (ioctl(sep->se_fd, FIONBIO, &i) < 0)
603 syslog(LOG_ERR, "ioctl1(FIONBIO, 0): %m");
604 if (ioctl(ctrl, FIONBIO, &i) < 0)
605 syslog(LOG_ERR, "ioctl2(FIONBIO, 0): %m");
606 if (cpmip(sep, ctrl) < 0) {
607 close(ctrl);
608 continue;
609 }
610 if (dofork &&
611 (conn = search_conn(sep, ctrl)) != NULL &&
612 !room_conn(sep, conn)) {
613 close(ctrl);
614 continue;
615 }
616 } else
617 ctrl = sep->se_fd;
618 if (dolog && !ISWRAP(sep)) {
619 char pname[INET6_ADDRSTRLEN] = "unknown";
620 socklen_t sl;
621 sl = sizeof peermax;
622 if (getpeername(ctrl, (struct sockaddr *)
623 &peermax, &sl)) {
624 sl = sizeof peermax;
625 if (recvfrom(ctrl, buf, sizeof(buf),
626 MSG_PEEK,
627 (struct sockaddr *)&peermax,
628 &sl) >= 0) {
629 getnameinfo((struct sockaddr *)&peermax,
630 peer.sa_len,
631 pname, sizeof(pname),
632 NULL, 0,
633 NI_NUMERICHOST|
634 NI_WITHSCOPEID);
635 }
636 } else {
637 getnameinfo((struct sockaddr *)&peermax,
638 peer.sa_len,
639 pname, sizeof(pname),
640 NULL, 0,
641 NI_NUMERICHOST|
642 NI_WITHSCOPEID);
643 }
644 syslog(LOG_INFO,"%s from %s", sep->se_service, pname);
645 }
646 sigblock(SIGBLOCK);
647 pid = 0;
648 /*
649 * Fork for all external services, builtins which need to
650 * fork and anything we're wrapping (as wrapping might
651 * block or use hosts_options(5) twist).
652 */
653 if (dofork) {
654 if (sep->se_count++ == 0)
655 gettimeofday(&sep->se_time, NULL);
656 else if (toomany > 0 && sep->se_count >= toomany) {
657 struct timeval now;
658
659 gettimeofday(&now, NULL);
660 if (now.tv_sec - sep->se_time.tv_sec >
661 CNT_INTVL) {
662 sep->se_time = now;
663 sep->se_count = 1;
664 } else {
665 syslog(LOG_ERR,
666 "%s/%s server failing (looping), service terminated",
667 sep->se_service, sep->se_proto);
668 if (sep->se_accept &&
669 sep->se_socktype == SOCK_STREAM)
670 close(ctrl);
671 close_sep(sep);
672 free_conn(conn);
673 sigsetmask(0L);
674 if (!timingout) {
675 timingout = 1;
676 alarm(RETRYTIME);
677 }
678 continue;
679 }
680 }
681 pid = fork();
682 }
683 if (pid < 0) {
684 syslog(LOG_ERR, "fork: %m");
685 if (sep->se_accept &&
686 sep->se_socktype == SOCK_STREAM)
687 close(ctrl);
688 free_conn(conn);
689 sigsetmask(0L);
690 sleep(1);
691 continue;
692 }
693 if (pid) {
694 addchild_conn(conn, pid);
695 addchild(sep, pid);
696 }
697 sigsetmask(0L);
698 if (pid == 0) {
699 if (dofork) {
700 sigaction(SIGALRM, &saalrm, NULL);
701 sigaction(SIGCHLD, &sachld, NULL);
702 sigaction(SIGHUP, &sahup, NULL);
703 /* SIGPIPE reset before exec */
704 }
705 /*
706 * Call tcpmux to find the real service to exec.
707 */
708 if (sep->se_bi &&
709 sep->se_bi->bi_fn == (bi_fn_t *) tcpmux) {
710 sep = tcpmux(ctrl);
711 if (sep == NULL) {
712 close(ctrl);
713 _exit(0);
714 }
715 }
716 if (ISWRAP(sep)) {
717 inetd_setproctitle("wrapping", ctrl);
718 service = sep->se_server_name ?
719 sep->se_server_name : sep->se_service;
720 request_init(&req, RQ_DAEMON, service, RQ_FILE, ctrl, NULL);
721 fromhost(&req);
722 deny_severity = LIBWRAP_DENY_FACILITY|LIBWRAP_DENY_SEVERITY;
723 allow_severity = LIBWRAP_ALLOW_FACILITY|LIBWRAP_ALLOW_SEVERITY;
724 denied = !hosts_access(&req);
725 if (denied) {
726 syslog(deny_severity,
727 "refused connection from %.500s, service %s (%s%s)",
728 eval_client(&req), service, sep->se_proto,
729 (whichaf(&req) == AF_INET6) ? "6" : "");
730 if (sep->se_socktype != SOCK_STREAM)
731 recv(ctrl, buf, sizeof (buf), 0);
732 if (dofork) {
733 sleep(1);
734 _exit(0);
735 }
736 }
737 if (dolog) {
738 syslog(allow_severity,
739 "connection from %.500s, service %s (%s%s)",
740 eval_client(&req), service, sep->se_proto,
741 (whichaf(&req) == AF_INET6) ? "6" : "");
742 }
743 }
744 if (sep->se_bi) {
745 (*sep->se_bi->bi_fn)(ctrl, sep);
746 } else {
747 if (debug)
748 warnx("%d execl %s",
749 getpid(), sep->se_server);
750 /* Clear close-on-exec. */
751 if (fcntl(ctrl, F_SETFD, 0) < 0) {
752 syslog(LOG_ERR,
753 "%s/%s: fcntl (F_SETFD, 0): %m",
754 sep->se_service, sep->se_proto);
755 _exit(EX_OSERR);
756 }
757 if (ctrl != 0) {
758 dup2(ctrl, 0);
759 close(ctrl);
760 }
761 dup2(0, 1);
762 dup2(0, 2);
763 if ((pwd = getpwnam(sep->se_user)) == NULL) {
764 syslog(LOG_ERR,
765 "%s/%s: %s: no such user",
766 sep->se_service, sep->se_proto,
767 sep->se_user);
768 if (sep->se_socktype != SOCK_STREAM)
769 recv(0, buf, sizeof (buf), 0);
770 _exit(EX_NOUSER);
771 }
772 grp = NULL;
773 if ( sep->se_group != NULL
774 && (grp = getgrnam(sep->se_group)) == NULL
775 ) {
776 syslog(LOG_ERR,
777 "%s/%s: %s: no such group",
778 sep->se_service, sep->se_proto,
779 sep->se_group);
780 if (sep->se_socktype != SOCK_STREAM)
781 recv(0, buf, sizeof (buf), 0);
782 _exit(EX_NOUSER);
783 }
784 if (grp != NULL)
785 pwd->pw_gid = grp->gr_gid;
786 #ifdef LOGIN_CAP
787 if ((lc = login_getclass(sep->se_class)) == NULL) {
788 /* error syslogged by getclass */
789 syslog(LOG_ERR,
790 "%s/%s: %s: login class error",
791 sep->se_service, sep->se_proto,
792 sep->se_class);
793 if (sep->se_socktype != SOCK_STREAM)
794 recv(0, buf, sizeof (buf), 0);
795 _exit(EX_NOUSER);
796 }
797 #endif
798 if (setsid() < 0) {
799 syslog(LOG_ERR,
800 "%s: can't setsid(): %m",
801 sep->se_service);
802 /* _exit(EX_OSERR); not fatal yet */
803 }
804 #ifdef LOGIN_CAP
805 if (setusercontext(lc, pwd, pwd->pw_uid,
806 LOGIN_SETALL) != 0) {
807 syslog(LOG_ERR,
808 "%s: can't setusercontext(..%s..): %m",
809 sep->se_service, sep->se_user);
810 _exit(EX_OSERR);
811 }
812 login_close(lc);
813 #else
814 if (pwd->pw_uid) {
815 if (setlogin(sep->se_user) < 0) {
816 syslog(LOG_ERR,
817 "%s: can't setlogin(%s): %m",
818 sep->se_service, sep->se_user);
819 /* _exit(EX_OSERR); not yet */
820 }
821 if (setgid(pwd->pw_gid) < 0) {
822 syslog(LOG_ERR,
823 "%s: can't set gid %d: %m",
824 sep->se_service, pwd->pw_gid);
825 _exit(EX_OSERR);
826 }
827 initgroups(pwd->pw_name,
828 pwd->pw_gid);
829 if (setuid(pwd->pw_uid) < 0) {
830 syslog(LOG_ERR,
831 "%s: can't set uid %d: %m",
832 sep->se_service, pwd->pw_uid);
833 _exit(EX_OSERR);
834 }
835 }
836 #endif
837 sigaction(SIGPIPE, &sapipe, NULL);
838 execv(sep->se_server, sep->se_argv);
839 syslog(LOG_ERR,
840 "cannot execute %s: %m", sep->se_server);
841 if (sep->se_socktype != SOCK_STREAM)
842 recv(0, buf, sizeof (buf), 0);
843 }
844 if (dofork)
845 _exit(0);
846 }
847 if (sep->se_accept && sep->se_socktype == SOCK_STREAM)
848 close(ctrl);
849 }
850 }
851 }
852
853 /*
854 * Add a signal flag to the signal flag queue for later handling
855 */
856
857 void
858 flag_signal(int c)
859 {
860 char ch = c;
861
862 if (write(signalpipe[1], &ch, 1) != 1) {
863 syslog(LOG_ERR, "write: %m");
864 _exit(EX_OSERR);
865 }
866 }
867
868 /*
869 * Record a new child pid for this service. If we've reached the
870 * limit on children, then stop accepting incoming requests.
871 */
872
873 void
874 addchild(struct servtab *sep, pid_t pid)
875 {
876 if (sep->se_maxchild <= 0)
877 return;
878 #ifdef SANITY_CHECK
879 if (sep->se_numchild >= sep->se_maxchild) {
880 syslog(LOG_ERR, "%s: %d >= %d",
881 __func__, sep->se_numchild, sep->se_maxchild);
882 exit(EX_SOFTWARE);
883 }
884 #endif
885 sep->se_pids[sep->se_numchild++] = pid;
886 if (sep->se_numchild == sep->se_maxchild)
887 disable(sep);
888 }
889
890 /*
891 * Some child process has exited. See if it's on somebody's list.
892 */
893
894 void
895 flag_reapchild(int signo __unused)
896 {
897 flag_signal('C');
898 }
899
900 void
901 reapchild(void)
902 {
903 int k, status;
904 pid_t pid;
905 struct servtab *sep;
906
907 for (;;) {
908 pid = wait3(&status, WNOHANG, NULL);
909 if (pid <= 0)
910 break;
911 if (debug)
912 warnx("%d reaped, %s %u", pid,
913 WIFEXITED(status) ? "status" : "signal",
914 WIFEXITED(status) ? WEXITSTATUS(status)
915 : WTERMSIG(status));
916 for (sep = servtab; sep; sep = sep->se_next) {
917 for (k = 0; k < sep->se_numchild; k++)
918 if (sep->se_pids[k] == pid)
919 break;
920 if (k == sep->se_numchild)
921 continue;
922 if (sep->se_numchild == sep->se_maxchild)
923 enable(sep);
924 sep->se_pids[k] = sep->se_pids[--sep->se_numchild];
925 if (WIFSIGNALED(status) || WEXITSTATUS(status))
926 syslog(LOG_WARNING,
927 "%s[%d]: exited, %s %u",
928 sep->se_server, pid,
929 WIFEXITED(status) ? "status" : "signal",
930 WIFEXITED(status) ? WEXITSTATUS(status)
931 : WTERMSIG(status));
932 break;
933 }
934 reapchild_conn(pid);
935 }
936 }
937
938 void
939 flag_config(int signo __unused)
940 {
941 flag_signal('H');
942 }
943
944 void
945 config(void)
946 {
947 struct servtab *sep, *new, **sepp;
948 long omask;
949 #ifdef LOGIN_CAP
950 login_cap_t *lc = NULL;
951 #endif
952
953
954 if (!setconfig()) {
955 syslog(LOG_ERR, "%s: %m", CONFIG);
956 return;
957 }
958 for (sep = servtab; sep; sep = sep->se_next)
959 sep->se_checked = 0;
960 while ((new = getconfigent())) {
961 if (getpwnam(new->se_user) == NULL) {
962 syslog(LOG_ERR,
963 "%s/%s: no such user '%s', service ignored",
964 new->se_service, new->se_proto, new->se_user);
965 continue;
966 }
967 if (new->se_group && getgrnam(new->se_group) == NULL) {
968 syslog(LOG_ERR,
969 "%s/%s: no such group '%s', service ignored",
970 new->se_service, new->se_proto, new->se_group);
971 continue;
972 }
973 #ifdef LOGIN_CAP
974 if ((lc = login_getclass(new->se_class)) == NULL) {
975 /* error syslogged by getclass */
976 syslog(LOG_ERR,
977 "%s/%s: %s: login class error, service ignored",
978 new->se_service, new->se_proto, new->se_class);
979 continue;
980 }
981 login_close(lc);
982 #endif
983 for (sep = servtab; sep; sep = sep->se_next)
984 if (strcmp(sep->se_service, new->se_service) == 0 &&
985 strcmp(sep->se_proto, new->se_proto) == 0 &&
986 sep->se_socktype == new->se_socktype &&
987 sep->se_family == new->se_family)
988 break;
989 if (sep != 0) {
990 int i;
991
992 #define SWAP(a, b) { typeof(a) c = a; a = b; b = c; }
993 omask = sigblock(SIGBLOCK);
994 if (sep->se_nomapped != new->se_nomapped) {
995 sep->se_nomapped = new->se_nomapped;
996 sep->se_reset = 1;
997 }
998 /* copy over outstanding child pids */
999 if (sep->se_maxchild > 0 && new->se_maxchild > 0) {
1000 new->se_numchild = sep->se_numchild;
1001 if (new->se_numchild > new->se_maxchild)
1002 new->se_numchild = new->se_maxchild;
1003 memcpy(new->se_pids, sep->se_pids,
1004 new->se_numchild * sizeof(*new->se_pids));
1005 }
1006 SWAP(sep->se_pids, new->se_pids);
1007 sep->se_maxchild = new->se_maxchild;
1008 sep->se_numchild = new->se_numchild;
1009 sep->se_maxcpm = new->se_maxcpm;
1010 resize_conn(sep, new->se_maxperip);
1011 sep->se_maxperip = new->se_maxperip;
1012 sep->se_bi = new->se_bi;
1013 /* might need to turn on or off service now */
1014 if (sep->se_fd >= 0) {
1015 if (sep->se_maxchild > 0
1016 && sep->se_numchild == sep->se_maxchild) {
1017 if (FD_ISSET(sep->se_fd, &allsock))
1018 disable(sep);
1019 } else {
1020 if (!FD_ISSET(sep->se_fd, &allsock))
1021 enable(sep);
1022 }
1023 }
1024 sep->se_accept = new->se_accept;
1025 SWAP(sep->se_user, new->se_user);
1026 SWAP(sep->se_group, new->se_group);
1027 #ifdef LOGIN_CAP
1028 SWAP(sep->se_class, new->se_class);
1029 #endif
1030 SWAP(sep->se_server, new->se_server);
1031 SWAP(sep->se_server_name, new->se_server_name);
1032 for (i = 0; i < MAXARGV; i++)
1033 SWAP(sep->se_argv[i], new->se_argv[i]);
1034 #ifdef IPSEC
1035 SWAP(sep->se_policy, new->se_policy);
1036 ipsecsetup(sep);
1037 #endif
1038 sigsetmask(omask);
1039 freeconfig(new);
1040 if (debug)
1041 print_service("REDO", sep);
1042 } else {
1043 sep = enter(new);
1044 if (debug)
1045 print_service("ADD ", sep);
1046 }
1047 sep->se_checked = 1;
1048 if (ISMUX(sep)) {
1049 sep->se_fd = -1;
1050 continue;
1051 }
1052 switch (sep->se_family) {
1053 case AF_INET:
1054 if (no_v4bind != 0) {
1055 sep->se_fd = -1;
1056 continue;
1057 }
1058 break;
1059 #ifdef INET6
1060 case AF_INET6:
1061 if (no_v6bind != 0) {
1062 sep->se_fd = -1;
1063 continue;
1064 }
1065 break;
1066 #endif
1067 }
1068 if (!sep->se_rpc) {
1069 if (sep->se_family != AF_UNIX) {
1070 sp = getservbyname(sep->se_service, sep->se_proto);
1071 if (sp == 0) {
1072 syslog(LOG_ERR, "%s/%s: unknown service",
1073 sep->se_service, sep->se_proto);
1074 sep->se_checked = 0;
1075 continue;
1076 }
1077 }
1078 switch (sep->se_family) {
1079 case AF_INET:
1080 if (sp->s_port != sep->se_ctrladdr4.sin_port) {
1081 sep->se_ctrladdr4.sin_port =
1082 sp->s_port;
1083 sep->se_reset = 1;
1084 }
1085 break;
1086 #ifdef INET6
1087 case AF_INET6:
1088 if (sp->s_port !=
1089 sep->se_ctrladdr6.sin6_port) {
1090 sep->se_ctrladdr6.sin6_port =
1091 sp->s_port;
1092 sep->se_reset = 1;
1093 }
1094 break;
1095 #endif
1096 }
1097 if (sep->se_reset != 0 && sep->se_fd >= 0)
1098 close_sep(sep);
1099 } else {
1100 rpc = getrpcbyname(sep->se_service);
1101 if (rpc == 0) {
1102 syslog(LOG_ERR, "%s/%s unknown RPC service",
1103 sep->se_service, sep->se_proto);
1104 if (sep->se_fd != -1)
1105 close(sep->se_fd);
1106 sep->se_fd = -1;
1107 continue;
1108 }
1109 if (rpc->r_number != sep->se_rpc_prog) {
1110 if (sep->se_rpc_prog)
1111 unregisterrpc(sep);
1112 sep->se_rpc_prog = rpc->r_number;
1113 if (sep->se_fd != -1)
1114 close(sep->se_fd);
1115 sep->se_fd = -1;
1116 }
1117 }
1118 if (sep->se_fd == -1)
1119 setup(sep);
1120 }
1121 endconfig();
1122 /*
1123 * Purge anything not looked at above.
1124 */
1125 omask = sigblock(SIGBLOCK);
1126 sepp = &servtab;
1127 while ((sep = *sepp)) {
1128 if (sep->se_checked) {
1129 sepp = &sep->se_next;
1130 continue;
1131 }
1132 *sepp = sep->se_next;
1133 if (sep->se_fd >= 0)
1134 close_sep(sep);
1135 if (debug)
1136 print_service("FREE", sep);
1137 if (sep->se_rpc && sep->se_rpc_prog > 0)
1138 unregisterrpc(sep);
1139 freeconfig(sep);
1140 free(sep);
1141 }
1142 sigsetmask(omask);
1143 }
1144
1145 void
1146 unregisterrpc(struct servtab *sep)
1147 {
1148 u_int i;
1149 struct servtab *sepp;
1150 long omask;
1151
1152 omask = sigblock(SIGBLOCK);
1153 for (sepp = servtab; sepp; sepp = sepp->se_next) {
1154 if (sepp == sep)
1155 continue;
1156 if (sep->se_checked == 0 ||
1157 !sepp->se_rpc ||
1158 sep->se_rpc_prog != sepp->se_rpc_prog)
1159 continue;
1160 return;
1161 }
1162 if (debug)
1163 print_service("UNREG", sep);
1164 for (i = sep->se_rpc_lowvers; i <= sep->se_rpc_highvers; i++)
1165 pmap_unset(sep->se_rpc_prog, i);
1166 if (sep->se_fd != -1)
1167 close(sep->se_fd);
1168 sep->se_fd = -1;
1169 sigsetmask(omask);
1170 }
1171
1172 void
1173 flag_retry(int signo __unused)
1174 {
1175 flag_signal('A');
1176 }
1177
1178 void
1179 retry(void)
1180 {
1181 struct servtab *sep;
1182
1183 timingout = 0;
1184 for (sep = servtab; sep; sep = sep->se_next)
1185 if (sep->se_fd == -1 && !ISMUX(sep))
1186 setup(sep);
1187 }
1188
1189 void
1190 setup(struct servtab *sep)
1191 {
1192 int on = 1;
1193
1194 if ((sep->se_fd = socket(sep->se_family, sep->se_socktype, 0)) < 0) {
1195 if (debug)
1196 warn("socket failed on %s/%s",
1197 sep->se_service, sep->se_proto);
1198 syslog(LOG_ERR, "%s/%s: socket: %m",
1199 sep->se_service, sep->se_proto);
1200 return;
1201 }
1202 /* Set all listening sockets to close-on-exec. */
1203 if (fcntl(sep->se_fd, F_SETFD, FD_CLOEXEC) < 0) {
1204 syslog(LOG_ERR, "%s/%s: fcntl (F_SETFD, FD_CLOEXEC): %m",
1205 sep->se_service, sep->se_proto);
1206 close(sep->se_fd);
1207 return;
1208 }
1209 #define turnon(fd, opt) \
1210 setsockopt(fd, SOL_SOCKET, opt, (char *)&on, sizeof (on))
1211 if (strcmp(sep->se_proto, "tcp") == 0 && (options & SO_DEBUG) &&
1212 turnon(sep->se_fd, SO_DEBUG) < 0)
1213 syslog(LOG_ERR, "setsockopt (SO_DEBUG): %m");
1214 if (turnon(sep->se_fd, SO_REUSEADDR) < 0)
1215 syslog(LOG_ERR, "setsockopt (SO_REUSEADDR): %m");
1216 #ifdef SO_PRIVSTATE
1217 if (turnon(sep->se_fd, SO_PRIVSTATE) < 0)
1218 syslog(LOG_ERR, "setsockopt (SO_PRIVSTATE): %m");
1219 #endif
1220 /* tftpd opens a new connection then needs more infos */
1221 if ((sep->se_family == AF_INET6) &&
1222 (strcmp(sep->se_proto, "udp") == 0) &&
1223 (sep->se_accept == 0) &&
1224 (setsockopt(sep->se_fd, IPPROTO_IPV6, IPV6_PKTINFO,
1225 (char *)&on, sizeof (on)) < 0))
1226 syslog(LOG_ERR, "setsockopt (IPV6_RECVPKTINFO): %m");
1227 if (sep->se_family == AF_INET6) {
1228 int flag = sep->se_nomapped ? 1 : 0;
1229 if (setsockopt(sep->se_fd, IPPROTO_IPV6, IPV6_V6ONLY,
1230 (char *)&flag, sizeof (flag)) < 0)
1231 syslog(LOG_ERR, "setsockopt (IPV6_V6ONLY): %m");
1232 }
1233 #undef turnon
1234 if (sep->se_type == TTCP_TYPE)
1235 if (setsockopt(sep->se_fd, IPPROTO_TCP, TCP_NOPUSH,
1236 (char *)&on, sizeof (on)) < 0)
1237 syslog(LOG_ERR, "setsockopt (TCP_NOPUSH): %m");
1238 #ifdef IPV6_FAITH
1239 if (sep->se_type == FAITH_TYPE) {
1240 if (setsockopt(sep->se_fd, IPPROTO_IPV6, IPV6_FAITH, &on,
1241 sizeof(on)) < 0) {
1242 syslog(LOG_ERR, "setsockopt (IPV6_FAITH): %m");
1243 }
1244 }
1245 #endif
1246 #ifdef IPSEC
1247 ipsecsetup(sep);
1248 #endif
1249 if (sep->se_family == AF_UNIX) {
1250 unlink(sep->se_ctrladdr_un.sun_path);
1251 umask(0777); /* Make socket with conservative permissions */
1252 }
1253 if (bind(sep->se_fd, (struct sockaddr *)&sep->se_ctrladdr,
1254 sep->se_ctrladdr_size) < 0) {
1255 if (debug)
1256 warn("bind failed on %s/%s",
1257 sep->se_service, sep->se_proto);
1258 syslog(LOG_ERR, "%s/%s: bind: %m",
1259 sep->se_service, sep->se_proto);
1260 close(sep->se_fd);
1261 sep->se_fd = -1;
1262 if (!timingout) {
1263 timingout = 1;
1264 alarm(RETRYTIME);
1265 }
1266 if (sep->se_family == AF_UNIX)
1267 umask(mask);
1268 return;
1269 }
1270 if (sep->se_family == AF_UNIX) {
1271 /* Ick - fch{own,mod} don't work on Unix domain sockets */
1272 if (chown(sep->se_service, sep->se_sockuid, sep->se_sockgid) < 0)
1273 syslog(LOG_ERR, "chown socket: %m");
1274 if (chmod(sep->se_service, sep->se_sockmode) < 0)
1275 syslog(LOG_ERR, "chmod socket: %m");
1276 umask(mask);
1277 }
1278 if (sep->se_rpc) {
1279 u_int i;
1280 socklen_t len = sep->se_ctrladdr_size;
1281
1282 if (sep->se_family != AF_INET) {
1283 syslog(LOG_ERR,
1284 "%s/%s: unsupported address family for rpc",
1285 sep->se_service, sep->se_proto);
1286 close(sep->se_fd);
1287 sep->se_fd = -1;
1288 return;
1289 }
1290 if (getsockname(sep->se_fd,
1291 (struct sockaddr*)&sep->se_ctrladdr, &len) < 0){
1292 syslog(LOG_ERR, "%s/%s: getsockname: %m",
1293 sep->se_service, sep->se_proto);
1294 close(sep->se_fd);
1295 sep->se_fd = -1;
1296 return;
1297 }
1298 if (debug)
1299 print_service("REG ", sep);
1300 for (i = sep->se_rpc_lowvers; i <= sep->se_rpc_highvers; i++) {
1301 pmap_unset(sep->se_rpc_prog, i);
1302 pmap_set(sep->se_rpc_prog, i,
1303 (sep->se_socktype == SOCK_DGRAM)
1304 ? IPPROTO_UDP : IPPROTO_TCP,
1305 ntohs(sep->se_ctrladdr4.sin_port));
1306 }
1307 }
1308 if (sep->se_socktype == SOCK_STREAM)
1309 listen(sep->se_fd, 64);
1310 enable(sep);
1311 if (debug) {
1312 warnx("registered %s on %d",
1313 sep->se_server, sep->se_fd);
1314 }
1315 }
1316
1317 #ifdef IPSEC
1318 void
1319 ipsecsetup(struct servtab *sep)
1320 {
1321 char *buf;
1322 char *policy_in = NULL;
1323 char *policy_out = NULL;
1324 int level;
1325 int opt;
1326
1327 switch (sep->se_family) {
1328 case AF_INET:
1329 level = IPPROTO_IP;
1330 opt = IP_IPSEC_POLICY;
1331 break;
1332 #ifdef INET6
1333 case AF_INET6:
1334 level = IPPROTO_IPV6;
1335 opt = IPV6_IPSEC_POLICY;
1336 break;
1337 #endif
1338 default:
1339 return;
1340 }
1341
1342 if (!sep->se_policy || sep->se_policy[0] == '\0') {
1343 static char def_in[] = "in entrust", def_out[] = "out entrust";
1344 policy_in = def_in;
1345 policy_out = def_out;
1346 } else {
1347 if (!strncmp("in", sep->se_policy, 2))
1348 policy_in = sep->se_policy;
1349 else if (!strncmp("out", sep->se_policy, 3))
1350 policy_out = sep->se_policy;
1351 else {
1352 syslog(LOG_ERR, "invalid security policy \"%s\"",
1353 sep->se_policy);
1354 return;
1355 }
1356 }
1357
1358 if (policy_in != NULL) {
1359 buf = ipsec_set_policy(policy_in, strlen(policy_in));
1360 if (buf != NULL) {
1361 if (setsockopt(sep->se_fd, level, opt,
1362 buf, ipsec_get_policylen(buf)) < 0 &&
1363 debug != 0)
1364 warnx("%s/%s: ipsec initialization failed; %s",
1365 sep->se_service, sep->se_proto,
1366 policy_in);
1367 free(buf);
1368 } else
1369 syslog(LOG_ERR, "invalid security policy \"%s\"",
1370 policy_in);
1371 }
1372 if (policy_out != NULL) {
1373 buf = ipsec_set_policy(policy_out, strlen(policy_out));
1374 if (buf != NULL) {
1375 if (setsockopt(sep->se_fd, level, opt,
1376 buf, ipsec_get_policylen(buf)) < 0 &&
1377 debug != 0)
1378 warnx("%s/%s: ipsec initialization failed; %s",
1379 sep->se_service, sep->se_proto,
1380 policy_out);
1381 free(buf);
1382 } else
1383 syslog(LOG_ERR, "invalid security policy \"%s\"",
1384 policy_out);
1385 }
1386 }
1387 #endif
1388
1389 /*
1390 * Finish with a service and its socket.
1391 */
1392 void
1393 close_sep(struct servtab *sep)
1394 {
1395 if (sep->se_fd >= 0) {
1396 if (FD_ISSET(sep->se_fd, &allsock))
1397 disable(sep);
1398 close(sep->se_fd);
1399 sep->se_fd = -1;
1400 }
1401 sep->se_count = 0;
1402 sep->se_numchild = 0; /* forget about any existing children */
1403 }
1404
1405 int
1406 matchservent(const char *name1, const char *name2, const char *proto)
1407 {
1408 char **alias, *p;
1409 struct servent *se;
1410
1411 if (strcmp(proto, "unix") == 0) {
1412 if ((p = strrchr(name1, '/')) != NULL)
1413 name1 = p + 1;
1414 if ((p = strrchr(name2, '/')) != NULL)
1415 name2 = p + 1;
1416 }
1417 if (strcmp(name1, name2) == 0)
1418 return(1);
1419 if ((se = getservbyname(name1, proto)) != NULL) {
1420 if (strcmp(name2, se->s_name) == 0)
1421 return(1);
1422 for (alias = se->s_aliases; *alias; alias++)
1423 if (strcmp(name2, *alias) == 0)
1424 return(1);
1425 }
1426 return(0);
1427 }
1428
1429 struct servtab *
1430 enter(struct servtab *cp)
1431 {
1432 struct servtab *sep;
1433 long omask;
1434
1435 sep = (struct servtab *)malloc(sizeof (*sep));
1436 if (sep == NULL) {
1437 syslog(LOG_ERR, "malloc: %m");
1438 exit(EX_OSERR);
1439 }
1440 *sep = *cp;
1441 sep->se_fd = -1;
1442 omask = sigblock(SIGBLOCK);
1443 sep->se_next = servtab;
1444 servtab = sep;
1445 sigsetmask(omask);
1446 return (sep);
1447 }
1448
1449 void
1450 enable(struct servtab *sep)
1451 {
1452 if (debug)
1453 warnx(
1454 "enabling %s, fd %d", sep->se_service, sep->se_fd);
1455 #ifdef SANITY_CHECK
1456 if (sep->se_fd < 0) {
1457 syslog(LOG_ERR,
1458 "%s: %s: bad fd", __func__, sep->se_service);
1459 exit(EX_SOFTWARE);
1460 }
1461 if (ISMUX(sep)) {
1462 syslog(LOG_ERR,
1463 "%s: %s: is mux", __func__, sep->se_service);
1464 exit(EX_SOFTWARE);
1465 }
1466 if (FD_ISSET(sep->se_fd, &allsock)) {
1467 syslog(LOG_ERR,
1468 "%s: %s: not off", __func__, sep->se_service);
1469 exit(EX_SOFTWARE);
1470 }
1471 nsock++;
1472 #endif
1473 FD_SET(sep->se_fd, &allsock);
1474 if (sep->se_fd > maxsock)
1475 maxsock = sep->se_fd;
1476 }
1477
1478 void
1479 disable(struct servtab *sep)
1480 {
1481 if (debug)
1482 warnx(
1483 "disabling %s, fd %d", sep->se_service, sep->se_fd);
1484 #ifdef SANITY_CHECK
1485 if (sep->se_fd < 0) {
1486 syslog(LOG_ERR,
1487 "%s: %s: bad fd", __func__, sep->se_service);
1488 exit(EX_SOFTWARE);
1489 }
1490 if (ISMUX(sep)) {
1491 syslog(LOG_ERR,
1492 "%s: %s: is mux", __func__, sep->se_service);
1493 exit(EX_SOFTWARE);
1494 }
1495 if (!FD_ISSET(sep->se_fd, &allsock)) {
1496 syslog(LOG_ERR,
1497 "%s: %s: not on", __func__, sep->se_service);
1498 exit(EX_SOFTWARE);
1499 }
1500 if (nsock == 0) {
1501 syslog(LOG_ERR, "%s: nsock=0", __func__);
1502 exit(EX_SOFTWARE);
1503 }
1504 nsock--;
1505 #endif
1506 FD_CLR(sep->se_fd, &allsock);
1507 if (sep->se_fd == maxsock)
1508 maxsock--;
1509 }
1510
1511 FILE *fconfig = NULL;
1512 struct servtab serv;
1513 char line[LINE_MAX];
1514
1515 int
1516 setconfig(void)
1517 {
1518
1519 if (fconfig != NULL) {
1520 fseek(fconfig, 0L, SEEK_SET);
1521 return (1);
1522 }
1523 fconfig = fopen(CONFIG, "r");
1524 return (fconfig != NULL);
1525 }
1526
1527 void
1528 endconfig(void)
1529 {
1530 if (fconfig) {
1531 fclose(fconfig);
1532 fconfig = NULL;
1533 }
1534 }
1535
1536 struct servtab *
1537 getconfigent(void)
1538 {
1539 struct servtab *sep = &serv;
1540 int argc;
1541 char *cp, *arg, *s;
1542 char *versp;
1543 static char TCPMUX_TOKEN[] = "tcpmux/";
1544 #define MUX_LEN (sizeof(TCPMUX_TOKEN)-1)
1545 #ifdef IPSEC
1546 char *policy = NULL;
1547 #endif
1548 int v4bind = 0;
1549 #ifdef INET6
1550 int v6bind = 0;
1551 #endif
1552 int i;
1553
1554 more:
1555 while ((cp = nextline(fconfig)) != NULL) {
1556 #ifdef IPSEC
1557 /* lines starting with #@ is not a comment, but the policy */
1558 if (cp[0] == '#' && cp[1] == '@') {
1559 char *p;
1560 for (p = cp + 2; p && *p && isspace(*p); p++)
1561 ;
1562 if (*p == '\0') {
1563 if (policy)
1564 free(policy);
1565 policy = NULL;
1566 } else if (ipsec_get_policylen(p) >= 0) {
1567 if (policy)
1568 free(policy);
1569 policy = newstr(p);
1570 } else {
1571 syslog(LOG_ERR,
1572 "%s: invalid ipsec policy \"%s\"",
1573 CONFIG, p);
1574 exit(EX_CONFIG);
1575 }
1576 }
1577 #endif
1578 if (*cp == '#' || *cp == '\0')
1579 continue;
1580 break;
1581 }
1582 if (cp == NULL)
1583 return (NULL);
1584 /*
1585 * clear the static buffer, since some fields (se_ctrladdr,
1586 * for example) don't get initialized here.
1587 */
1588 memset(sep, 0, sizeof *sep);
1589 arg = skip(&cp);
1590 if (cp == NULL) {
1591 /* got an empty line containing just blanks/tabs. */
1592 goto more;
1593 }
1594 if (arg[0] == ':') { /* :user:group:perm: */
1595 char *user, *group, *perm;
1596 struct passwd *pw;
1597 struct group *gr;
1598 user = arg+1;
1599 if ((group = strchr(user, ':')) == NULL) {
1600 syslog(LOG_ERR, "no group after user '%s'", user);
1601 goto more;
1602 }
1603 *group++ = '\0';
1604 if ((perm = strchr(group, ':')) == NULL) {
1605 syslog(LOG_ERR, "no mode after group '%s'", group);
1606 goto more;
1607 }
1608 *perm++ = '\0';
1609 if ((pw = getpwnam(user)) == NULL) {
1610 syslog(LOG_ERR, "no such user '%s'", user);
1611 goto more;
1612 }
1613 sep->se_sockuid = pw->pw_uid;
1614 if ((gr = getgrnam(group)) == NULL) {
1615 syslog(LOG_ERR, "no such user '%s'", group);
1616 goto more;
1617 }
1618 sep->se_sockgid = gr->gr_gid;
1619 sep->se_sockmode = strtol(perm, &arg, 8);
1620 if (*arg != ':') {
1621 syslog(LOG_ERR, "bad mode '%s'", perm);
1622 goto more;
1623 }
1624 *arg++ = '\0';
1625 } else {
1626 sep->se_sockuid = euid;
1627 sep->se_sockgid = egid;
1628 sep->se_sockmode = 0200;
1629 }
1630 if (strncmp(arg, TCPMUX_TOKEN, MUX_LEN) == 0) {
1631 char *c = arg + MUX_LEN;
1632 if (*c == '+') {
1633 sep->se_type = MUXPLUS_TYPE;
1634 c++;
1635 } else
1636 sep->se_type = MUX_TYPE;
1637 sep->se_service = newstr(c);
1638 } else {
1639 sep->se_service = newstr(arg);
1640 sep->se_type = NORM_TYPE;
1641 }
1642 arg = sskip(&cp);
1643 if (strcmp(arg, "stream") == 0)
1644 sep->se_socktype = SOCK_STREAM;
1645 else if (strcmp(arg, "dgram") == 0)
1646 sep->se_socktype = SOCK_DGRAM;
1647 else if (strcmp(arg, "rdm") == 0)
1648 sep->se_socktype = SOCK_RDM;
1649 else if (strcmp(arg, "seqpacket") == 0)
1650 sep->se_socktype = SOCK_SEQPACKET;
1651 else if (strcmp(arg, "raw") == 0)
1652 sep->se_socktype = SOCK_RAW;
1653 else
1654 sep->se_socktype = -1;
1655
1656 arg = sskip(&cp);
1657 if (strncmp(arg, "tcp", 3) == 0) {
1658 sep->se_proto = newstr(strsep(&arg, "/"));
1659 if (arg != NULL) {
1660 if (strcmp(arg, "ttcp") == 0)
1661 sep->se_type = TTCP_TYPE;
1662 else if (strcmp(arg, "faith") == 0)
1663 sep->se_type = FAITH_TYPE;
1664 }
1665 } else {
1666 if (sep->se_type == NORM_TYPE &&
1667 strncmp(arg, "faith/", 6) == 0) {
1668 arg += 6;
1669 sep->se_type = FAITH_TYPE;
1670 }
1671 sep->se_proto = newstr(arg);
1672 }
1673 if (strncmp(sep->se_proto, "rpc/", 4) == 0) {
1674 if (no_v4bind != 0) {
1675 syslog(LOG_NOTICE, "IPv4 bind is ignored for %s",
1676 sep->se_service);
1677 freeconfig(sep);
1678 goto more;
1679 }
1680 memmove(sep->se_proto, sep->se_proto + 4,
1681 strlen(sep->se_proto) + 1 - 4);
1682 sep->se_rpc = 1;
1683 sep->se_rpc_prog = sep->se_rpc_lowvers =
1684 sep->se_rpc_lowvers = 0;
1685 memcpy(&sep->se_ctrladdr4, bind_sa4,
1686 sizeof(sep->se_ctrladdr4));
1687 if ((versp = strrchr(sep->se_service, '/'))) {
1688 *versp++ = '\0';
1689 switch (sscanf(versp, "%u-%u",
1690 &sep->se_rpc_lowvers,
1691 &sep->se_rpc_highvers)) {
1692 case 2:
1693 break;
1694 case 1:
1695 sep->se_rpc_highvers =
1696 sep->se_rpc_lowvers;
1697 break;
1698 default:
1699 syslog(LOG_ERR,
1700 "bad RPC version specifier; %s",
1701 sep->se_service);
1702 freeconfig(sep);
1703 goto more;
1704 }
1705 }
1706 else {
1707 sep->se_rpc_lowvers =
1708 sep->se_rpc_highvers = 1;
1709 }
1710 }
1711 sep->se_nomapped = 0;
1712 while (isdigit(sep->se_proto[strlen(sep->se_proto) - 1])) {
1713 #ifdef INET6
1714 if (sep->se_proto[strlen(sep->se_proto) - 1] == '6') {
1715 if (no_v6bind != 0) {
1716 syslog(LOG_NOTICE, "IPv6 bind is ignored for %s",
1717 sep->se_service);
1718 freeconfig(sep);
1719 goto more;
1720 }
1721 sep->se_proto[strlen(sep->se_proto) - 1] = '\0';
1722 v6bind = 1;
1723 continue;
1724 }
1725 #endif
1726 if (sep->se_proto[strlen(sep->se_proto) - 1] == '4') {
1727 sep->se_proto[strlen(sep->se_proto) - 1] = '\0';
1728 v4bind = 1;
1729 continue;
1730 }
1731 /* illegal version num */
1732 syslog(LOG_ERR, "bad IP version for %s", sep->se_proto);
1733 freeconfig(sep);
1734 goto more;
1735 }
1736 if (strcmp(sep->se_proto, "unix") == 0) {
1737 sep->se_family = AF_UNIX;
1738 } else
1739 #ifdef INET6
1740 if (v6bind != 0) {
1741 sep->se_family = AF_INET6;
1742 if (v4bind == 0 || no_v4bind != 0)
1743 sep->se_nomapped = 1;
1744 } else
1745 #endif
1746 { /* default to v4 bind if not v6 bind */
1747 if (no_v4bind != 0) {
1748 syslog(LOG_NOTICE, "IPv4 bind is ignored for %s",
1749 sep->se_service);
1750 freeconfig(sep);
1751 goto more;
1752 }
1753 sep->se_family = AF_INET;
1754 }
1755 /* init ctladdr */
1756 switch(sep->se_family) {
1757 case AF_INET:
1758 memcpy(&sep->se_ctrladdr4, bind_sa4,
1759 sizeof(sep->se_ctrladdr4));
1760 sep->se_ctrladdr_size = sizeof(sep->se_ctrladdr4);
1761 break;
1762 #ifdef INET6
1763 case AF_INET6:
1764 memcpy(&sep->se_ctrladdr6, bind_sa6,
1765 sizeof(sep->se_ctrladdr6));
1766 sep->se_ctrladdr_size = sizeof(sep->se_ctrladdr6);
1767 break;
1768 #endif
1769 case AF_UNIX:
1770 if (strlen(sep->se_service) >= sizeof(sep->se_ctrladdr_un.sun_path)) {
1771 syslog(LOG_ERR,
1772 "domain socket pathname too long for service %s",
1773 sep->se_service);
1774 goto more;
1775 }
1776 memset(&sep->se_ctrladdr, 0, sizeof(sep->se_ctrladdr));
1777 sep->se_ctrladdr_un.sun_family = sep->se_family;
1778 sep->se_ctrladdr_un.sun_len = strlen(sep->se_service);
1779 strcpy(sep->se_ctrladdr_un.sun_path, sep->se_service);
1780 sep->se_ctrladdr_size = SUN_LEN(&sep->se_ctrladdr_un);
1781 }
1782 arg = sskip(&cp);
1783 if (!strncmp(arg, "wait", 4))
1784 sep->se_accept = 0;
1785 else if (!strncmp(arg, "nowait", 6))
1786 sep->se_accept = 1;
1787 else {
1788 syslog(LOG_ERR,
1789 "%s: bad wait/nowait for service %s",
1790 CONFIG, sep->se_service);
1791 goto more;
1792 }
1793 sep->se_maxchild = -1;
1794 sep->se_maxcpm = -1;
1795 sep->se_maxperip = -1;
1796 if ((s = strchr(arg, '/')) != NULL) {
1797 char *eptr;
1798 u_long val;
1799
1800 val = strtoul(s + 1, &eptr, 10);
1801 if (eptr == s + 1 || val > MAX_MAXCHLD) {
1802 syslog(LOG_ERR,
1803 "%s: bad max-child for service %s",
1804 CONFIG, sep->se_service);
1805 goto more;
1806 }
1807 if (debug)
1808 if (!sep->se_accept && val != 1)
1809 warnx("maxchild=%lu for wait service %s"
1810 " not recommended", val, sep->se_service);
1811 sep->se_maxchild = val;
1812 if (*eptr == '/')
1813 sep->se_maxcpm = strtol(eptr + 1, &eptr, 10);
1814 if (*eptr == '/')
1815 sep->se_maxperip = strtol(eptr + 1, &eptr, 10);
1816 /*
1817 * explicitly do not check for \0 for future expansion /
1818 * backwards compatibility
1819 */
1820 }
1821 if (ISMUX(sep)) {
1822 /*
1823 * Silently enforce "nowait" mode for TCPMUX services
1824 * since they don't have an assigned port to listen on.
1825 */
1826 sep->se_accept = 1;
1827 if (strcmp(sep->se_proto, "tcp")) {
1828 syslog(LOG_ERR,
1829 "%s: bad protocol for tcpmux service %s",
1830 CONFIG, sep->se_service);
1831 goto more;
1832 }
1833 if (sep->se_socktype != SOCK_STREAM) {
1834 syslog(LOG_ERR,
1835 "%s: bad socket type for tcpmux service %s",
1836 CONFIG, sep->se_service);
1837 goto more;
1838 }
1839 }
1840 sep->se_user = newstr(sskip(&cp));
1841 #ifdef LOGIN_CAP
1842 if ((s = strrchr(sep->se_user, '/')) != NULL) {
1843 *s = '\0';
1844 sep->se_class = newstr(s + 1);
1845 } else
1846 sep->se_class = newstr(RESOURCE_RC);
1847 #endif
1848 if ((s = strrchr(sep->se_user, ':')) != NULL) {
1849 *s = '\0';
1850 sep->se_group = newstr(s + 1);
1851 } else
1852 sep->se_group = NULL;
1853 sep->se_server = newstr(sskip(&cp));
1854 if ((sep->se_server_name = strrchr(sep->se_server, '/')))
1855 sep->se_server_name++;
1856 if (strcmp(sep->se_server, "internal") == 0) {
1857 struct biltin *bi;
1858
1859 for (bi = biltins; bi->bi_service; bi++)
1860 if (bi->bi_socktype == sep->se_socktype &&
1861 matchservent(bi->bi_service, sep->se_service,
1862 sep->se_proto))
1863 break;
1864 if (bi->bi_service == 0) {
1865 syslog(LOG_ERR, "internal service %s unknown",
1866 sep->se_service);
1867 goto more;
1868 }
1869 sep->se_accept = 1; /* force accept mode for built-ins */
1870 sep->se_bi = bi;
1871 } else
1872 sep->se_bi = NULL;
1873 if (sep->se_maxperip < 0)
1874 sep->se_maxperip = maxperip;
1875 if (sep->se_maxcpm < 0)
1876 sep->se_maxcpm = maxcpm;
1877 if (sep->se_maxchild < 0) { /* apply default max-children */
1878 if (sep->se_bi && sep->se_bi->bi_maxchild >= 0)
1879 sep->se_maxchild = sep->se_bi->bi_maxchild;
1880 else if (sep->se_accept)
1881 sep->se_maxchild = maxchild > 0 ? maxchild : 0;
1882 else
1883 sep->se_maxchild = 1;
1884 }
1885 if (sep->se_maxchild > 0) {
1886 sep->se_pids = malloc(sep->se_maxchild * sizeof(*sep->se_pids));
1887 if (sep->se_pids == NULL) {
1888 syslog(LOG_ERR, "malloc: %m");
1889 exit(EX_OSERR);
1890 }
1891 }
1892 argc = 0;
1893 for (arg = skip(&cp); cp; arg = skip(&cp))
1894 if (argc < MAXARGV) {
1895 sep->se_argv[argc++] = newstr(arg);
1896 } else {
1897 syslog(LOG_ERR,
1898 "%s: too many arguments for service %s",
1899 CONFIG, sep->se_service);
1900 goto more;
1901 }
1902 while (argc <= MAXARGV)
1903 sep->se_argv[argc++] = NULL;
1904 for (i = 0; i < PERIPSIZE; ++i)
1905 LIST_INIT(&sep->se_conn[i]);
1906 #ifdef IPSEC
1907 sep->se_policy = policy ? newstr(policy) : NULL;
1908 #endif
1909 return (sep);
1910 }
1911
1912 void
1913 freeconfig(struct servtab *cp)
1914 {
1915 int i;
1916
1917 if (cp->se_service)
1918 free(cp->se_service);
1919 if (cp->se_proto)
1920 free(cp->se_proto);
1921 if (cp->se_user)
1922 free(cp->se_user);
1923 if (cp->se_group)
1924 free(cp->se_group);
1925 #ifdef LOGIN_CAP
1926 if (cp->se_class)
1927 free(cp->se_class);
1928 #endif
1929 if (cp->se_server)
1930 free(cp->se_server);
1931 if (cp->se_pids)
1932 free(cp->se_pids);
1933 for (i = 0; i < MAXARGV; i++)
1934 if (cp->se_argv[i])
1935 free(cp->se_argv[i]);
1936 free_connlist(cp);
1937 #ifdef IPSEC
1938 if (cp->se_policy)
1939 free(cp->se_policy);
1940 #endif
1941 }
1942
1943
1944 /*
1945 * Safe skip - if skip returns null, log a syntax error in the
1946 * configuration file and exit.
1947 */
1948 char *
1949 sskip(char **cpp)
1950 {
1951 char *cp;
1952
1953 cp = skip(cpp);
1954 if (cp == NULL) {
1955 syslog(LOG_ERR, "%s: syntax error", CONFIG);
1956 exit(EX_DATAERR);
1957 }
1958 return (cp);
1959 }
1960
1961 char *
1962 skip(char **cpp)
1963 {
1964 char *cp = *cpp;
1965 char *start;
1966 char quote = '\0';
1967
1968 again:
1969 while (*cp == ' ' || *cp == '\t')
1970 cp++;
1971 if (*cp == '\0') {
1972 int c;
1973
1974 c = getc(fconfig);
1975 ungetc(c, fconfig);
1976 if (c == ' ' || c == '\t')
1977 if ((cp = nextline(fconfig)))
1978 goto again;
1979 *cpp = NULL;
1980 return (NULL);
1981 }
1982 if (*cp == '"' || *cp == '\'')
1983 quote = *cp++;
1984 start = cp;
1985 if (quote)
1986 while (*cp && *cp != quote)
1987 cp++;
1988 else
1989 while (*cp && *cp != ' ' && *cp != '\t')
1990 cp++;
1991 if (*cp != '\0')
1992 *cp++ = '\0';
1993 *cpp = cp;
1994 return (start);
1995 }
1996
1997 char *
1998 nextline(FILE *fd)
1999 {
2000 char *cp;
2001
2002 if (fgets(line, sizeof (line), fd) == NULL)
2003 return (NULL);
2004 cp = strchr(line, '\n');
2005 if (cp)
2006 *cp = '\0';
2007 return (line);
2008 }
2009
2010 char *
2011 newstr(const char *cp)
2012 {
2013 char *cr;
2014
2015 if ((cr = strdup(cp != NULL ? cp : "")))
2016 return (cr);
2017 syslog(LOG_ERR, "strdup: %m");
2018 exit(EX_OSERR);
2019 }
2020
2021 void
2022 inetd_setproctitle(const char *a, int s)
2023 {
2024 socklen_t size;
2025 struct sockaddr_storage ss;
2026 char buf[80], pbuf[INET6_ADDRSTRLEN];
2027
2028 size = sizeof(ss);
2029 if (getpeername(s, (struct sockaddr *)&ss, &size) == 0) {
2030 getnameinfo((struct sockaddr *)&ss, size, pbuf, sizeof(pbuf),
2031 NULL, 0, NI_NUMERICHOST|NI_WITHSCOPEID);
2032 sprintf(buf, "%s [%s]", a, pbuf);
2033 } else
2034 sprintf(buf, "%s", a);
2035 setproctitle("%s", buf);
2036 }
2037
2038 int
2039 check_loop(const struct sockaddr *sa, const struct servtab *sep)
2040 {
2041 struct servtab *se2;
2042 char pname[INET6_ADDRSTRLEN];
2043
2044 for (se2 = servtab; se2; se2 = se2->se_next) {
2045 if (!se2->se_bi || se2->se_socktype != SOCK_DGRAM)
2046 continue;
2047
2048 switch (se2->se_family) {
2049 case AF_INET:
2050 if (((const struct sockaddr_in *)sa)->sin_port ==
2051 se2->se_ctrladdr4.sin_port)
2052 goto isloop;
2053 continue;
2054 #ifdef INET6
2055 case AF_INET6:
2056 if (((const struct sockaddr_in *)sa)->sin_port ==
2057 se2->se_ctrladdr4.sin_port)
2058 goto isloop;
2059 continue;
2060 #endif
2061 default:
2062 continue;
2063 }
2064 isloop:
2065 getnameinfo(sa, sa->sa_len, pname, sizeof(pname), NULL, 0,
2066 NI_NUMERICHOST|NI_WITHSCOPEID);
2067 syslog(LOG_WARNING, "%s/%s:%s/%s loop request REFUSED from %s",
2068 sep->se_service, sep->se_proto,
2069 se2->se_service, se2->se_proto,
2070 pname);
2071 return 1;
2072 }
2073 return 0;
2074 }
2075
2076 /*
2077 * print_service:
2078 * Dump relevant information to stderr
2079 */
2080 void
2081 print_service(const char *action, const struct servtab *sep)
2082 {
2083 fprintf(stderr,
2084 "%s: %s proto=%s accept=%d max=%d user=%s group=%s"
2085 #ifdef LOGIN_CAP
2086 "class=%s"
2087 #endif
2088 " builtin=%p server=%s"
2089 #ifdef IPSEC
2090 " policy=\"%s\""
2091 #endif
2092 "\n",
2093 action, sep->se_service, sep->se_proto,
2094 sep->se_accept, sep->se_maxchild, sep->se_user, sep->se_group,
2095 #ifdef LOGIN_CAP
2096 sep->se_class,
2097 #endif
2098 (void *) sep->se_bi, sep->se_server
2099 #ifdef IPSEC
2100 , (sep->se_policy ? sep->se_policy : "")
2101 #endif
2102 );
2103 }
2104
2105 #define CPMHSIZE 256
2106 #define CPMHMASK (CPMHSIZE-1)
2107 #define CHTGRAN 10
2108 #define CHTSIZE 6
2109
2110 typedef struct CTime {
2111 unsigned long ct_Ticks;
2112 int ct_Count;
2113 } CTime;
2114
2115 typedef struct CHash {
2116 union {
2117 struct in_addr c4_Addr;
2118 struct in6_addr c6_Addr;
2119 } cu_Addr;
2120 #define ch_Addr4 cu_Addr.c4_Addr
2121 #define ch_Addr6 cu_Addr.c6_Addr
2122 int ch_Family;
2123 time_t ch_LTime;
2124 char *ch_Service;
2125 CTime ch_Times[CHTSIZE];
2126 } CHash;
2127
2128 CHash CHashAry[CPMHSIZE];
2129
2130 int
2131 cpmip(const struct servtab *sep, int ctrl)
2132 {
2133 struct sockaddr_storage rss;
2134 socklen_t rssLen = sizeof(rss);
2135 int r = 0;
2136
2137 /*
2138 * If getpeername() fails, just let it through (if logging is
2139 * enabled the condition is caught elsewhere)
2140 */
2141
2142 if (sep->se_maxcpm > 0 &&
2143 getpeername(ctrl, (struct sockaddr *)&rss, &rssLen) == 0 ) {
2144 time_t t = time(NULL);
2145 int hv = 0xABC3D20F;
2146 int i;
2147 int cnt = 0;
2148 CHash *chBest = NULL;
2149 unsigned int ticks = t / CHTGRAN;
2150 struct sockaddr_in *sin4;
2151 #ifdef INET6
2152 struct sockaddr_in6 *sin6;
2153 #endif
2154
2155 sin4 = (struct sockaddr_in *)&rss;
2156 #ifdef INET6
2157 sin6 = (struct sockaddr_in6 *)&rss;
2158 #endif
2159 {
2160 char *p;
2161 int addrlen;
2162
2163 switch (rss.ss_family) {
2164 case AF_INET:
2165 p = (char *)&sin4->sin_addr;
2166 addrlen = sizeof(struct in_addr);
2167 break;
2168 #ifdef INET6
2169 case AF_INET6:
2170 p = (char *)&sin6->sin6_addr;
2171 addrlen = sizeof(struct in6_addr);
2172 break;
2173 #endif
2174 default:
2175 /* should not happen */
2176 return -1;
2177 }
2178
2179 for (i = 0; i < addrlen; ++i, ++p) {
2180 hv = (hv << 5) ^ (hv >> 23) ^ *p;
2181 }
2182 hv = (hv ^ (hv >> 16));
2183 }
2184 for (i = 0; i < 5; ++i) {
2185 CHash *ch = &CHashAry[(hv + i) & CPMHMASK];
2186
2187 if (rss.ss_family == AF_INET &&
2188 ch->ch_Family == AF_INET &&
2189 sin4->sin_addr.s_addr == ch->ch_Addr4.s_addr &&
2190 ch->ch_Service && strcmp(sep->se_service,
2191 ch->ch_Service) == 0) {
2192 chBest = ch;
2193 break;
2194 }
2195 #ifdef INET6
2196 if (rss.ss_family == AF_INET6 &&
2197 ch->ch_Family == AF_INET6 &&
2198 IN6_ARE_ADDR_EQUAL(&sin6->sin6_addr,
2199 &ch->ch_Addr6) != 0 &&
2200 ch->ch_Service && strcmp(sep->se_service,
2201 ch->ch_Service) == 0) {
2202 chBest = ch;
2203 break;
2204 }
2205 #endif
2206 if (chBest == NULL || ch->ch_LTime == 0 ||
2207 ch->ch_LTime < chBest->ch_LTime) {
2208 chBest = ch;
2209 }
2210 }
2211 if ((rss.ss_family == AF_INET &&
2212 (chBest->ch_Family != AF_INET ||
2213 sin4->sin_addr.s_addr != chBest->ch_Addr4.s_addr)) ||
2214 chBest->ch_Service == NULL ||
2215 strcmp(sep->se_service, chBest->ch_Service) != 0) {
2216 chBest->ch_Family = sin4->sin_family;
2217 chBest->ch_Addr4 = sin4->sin_addr;
2218 if (chBest->ch_Service)
2219 free(chBest->ch_Service);
2220 chBest->ch_Service = strdup(sep->se_service);
2221 bzero(chBest->ch_Times, sizeof(chBest->ch_Times));
2222 }
2223 #ifdef INET6
2224 if ((rss.ss_family == AF_INET6 &&
2225 (chBest->ch_Family != AF_INET6 ||
2226 IN6_ARE_ADDR_EQUAL(&sin6->sin6_addr,
2227 &chBest->ch_Addr6) == 0)) ||
2228 chBest->ch_Service == NULL ||
2229 strcmp(sep->se_service, chBest->ch_Service) != 0) {
2230 chBest->ch_Family = sin6->sin6_family;
2231 chBest->ch_Addr6 = sin6->sin6_addr;
2232 if (chBest->ch_Service)
2233 free(chBest->ch_Service);
2234 chBest->ch_Service = strdup(sep->se_service);
2235 bzero(chBest->ch_Times, sizeof(chBest->ch_Times));
2236 }
2237 #endif
2238 chBest->ch_LTime = t;
2239 {
2240 CTime *ct = &chBest->ch_Times[ticks % CHTSIZE];
2241 if (ct->ct_Ticks != ticks) {
2242 ct->ct_Ticks = ticks;
2243 ct->ct_Count = 0;
2244 }
2245 ++ct->ct_Count;
2246 }
2247 for (i = 0; i < CHTSIZE; ++i) {
2248 CTime *ct = &chBest->ch_Times[i];
2249 if (ct->ct_Ticks <= ticks &&
2250 ct->ct_Ticks >= ticks - CHTSIZE) {
2251 cnt += ct->ct_Count;
2252 }
2253 }
2254 if (cnt * (CHTSIZE * CHTGRAN) / 60 > sep->se_maxcpm) {
2255 char pname[INET6_ADDRSTRLEN];
2256
2257 getnameinfo((struct sockaddr *)&rss,
2258 ((struct sockaddr *)&rss)->sa_len,
2259 pname, sizeof(pname), NULL, 0,
2260 NI_NUMERICHOST|NI_WITHSCOPEID);
2261 r = -1;
2262 syslog(LOG_ERR,
2263 "%s from %s exceeded counts/min (limit %d/min)",
2264 sep->se_service, pname,
2265 sep->se_maxcpm);
2266 }
2267 }
2268 return(r);
2269 }
2270
2271 static struct conninfo *
2272 search_conn(struct servtab *sep, int ctrl)
2273 {
2274 struct sockaddr_storage ss;
2275 socklen_t sslen = sizeof(ss);
2276 struct conninfo *conn;
2277 int hv;
2278 char pname[NI_MAXHOST], pname2[NI_MAXHOST];
2279
2280 if (sep->se_maxperip <= 0)
2281 return NULL;
2282
2283 /*
2284 * If getpeername() fails, just let it through (if logging is
2285 * enabled the condition is caught elsewhere)
2286 */
2287 if (getpeername(ctrl, (struct sockaddr *)&ss, &sslen) != 0)
2288 return NULL;
2289
2290 switch (ss.ss_family) {
2291 case AF_INET:
2292 hv = hashval((char *)&((struct sockaddr_in *)&ss)->sin_addr,
2293 sizeof(struct in_addr));
2294 break;
2295 #ifdef INET6
2296 case AF_INET6:
2297 hv = hashval((char *)&((struct sockaddr_in6 *)&ss)->sin6_addr,
2298 sizeof(struct in6_addr));
2299 break;
2300 #endif
2301 default:
2302 /*
2303 * Since we only support AF_INET and AF_INET6, just
2304 * let other than AF_INET and AF_INET6 through.
2305 */
2306 return NULL;
2307 }
2308
2309 if (getnameinfo((struct sockaddr *)&ss, sslen, pname, sizeof(pname),
2310 NULL, 0, NI_NUMERICHOST | NI_WITHSCOPEID) != 0)
2311 return NULL;
2312
2313 LIST_FOREACH(conn, &sep->se_conn[hv], co_link) {
2314 if (getnameinfo((struct sockaddr *)&conn->co_addr,
2315 conn->co_addr.ss_len, pname2, sizeof(pname2), NULL, 0,
2316 NI_NUMERICHOST | NI_WITHSCOPEID) == 0 &&
2317 strcmp(pname, pname2) == 0)
2318 break;
2319 }
2320
2321 if (conn == NULL) {
2322 if ((conn = malloc(sizeof(struct conninfo))) == NULL) {
2323 syslog(LOG_ERR, "malloc: %m");
2324 exit(EX_OSERR);
2325 }
2326 conn->co_proc = malloc(sep->se_maxperip * sizeof(*conn->co_proc));
2327 if (conn->co_proc == NULL) {
2328 syslog(LOG_ERR, "malloc: %m");
2329 exit(EX_OSERR);
2330 }
2331 memcpy(&conn->co_addr, (struct sockaddr *)&ss, sslen);
2332 conn->co_numchild = 0;
2333 LIST_INSERT_HEAD(&sep->se_conn[hv], conn, co_link);
2334 }
2335
2336 /*
2337 * Since a child process is not invoked yet, we cannot
2338 * determine a pid of a child. So, co_proc and co_numchild
2339 * should be filled leter.
2340 */
2341
2342 return conn;
2343 }
2344
2345 static int
2346 room_conn(struct servtab *sep, struct conninfo *conn)
2347 {
2348 char pname[NI_MAXHOST];
2349
2350 if (conn->co_numchild >= sep->se_maxperip) {
2351 getnameinfo((struct sockaddr *)&conn->co_addr,
2352 conn->co_addr.ss_len, pname, sizeof(pname), NULL, 0,
2353 NI_NUMERICHOST | NI_WITHSCOPEID);
2354 syslog(LOG_ERR, "%s from %s exceeded counts (limit %d)",
2355 sep->se_service, pname, sep->se_maxperip);
2356 return 0;
2357 }
2358 return 1;
2359 }
2360
2361 static void
2362 addchild_conn(struct conninfo *conn, pid_t pid)
2363 {
2364 struct procinfo *proc;
2365
2366 if (conn == NULL)
2367 return;
2368
2369 if ((proc = search_proc(pid, 1)) != NULL) {
2370 if (proc->pr_conn != NULL) {
2371 syslog(LOG_ERR,
2372 "addchild_conn: child already on process list");
2373 exit(EX_OSERR);
2374 }
2375 proc->pr_conn = conn;
2376 }
2377
2378 conn->co_proc[conn->co_numchild++] = proc;
2379 }
2380
2381 static void
2382 reapchild_conn(pid_t pid)
2383 {
2384 struct procinfo *proc;
2385 struct conninfo *conn;
2386 int i;
2387
2388 if ((proc = search_proc(pid, 0)) == NULL)
2389 return;
2390 if ((conn = proc->pr_conn) == NULL)
2391 return;
2392 for (i = 0; i < conn->co_numchild; ++i)
2393 if (conn->co_proc[i] == proc) {
2394 conn->co_proc[i] = conn->co_proc[--conn->co_numchild];
2395 break;
2396 }
2397 free_proc(proc);
2398 free_conn(conn);
2399 }
2400
2401 static void
2402 resize_conn(struct servtab *sep, int maxpip)
2403 {
2404 struct conninfo *conn;
2405 int i, j;
2406
2407 if (sep->se_maxperip <= 0)
2408 return;
2409 if (maxpip <= 0) {
2410 free_connlist(sep);
2411 return;
2412 }
2413 for (i = 0; i < PERIPSIZE; ++i) {
2414 LIST_FOREACH(conn, &sep->se_conn[i], co_link) {
2415 for (j = maxpip; j < conn->co_numchild; ++j)
2416 free_proc(conn->co_proc[j]);
2417 conn->co_proc = realloc(conn->co_proc,
2418 maxpip * sizeof(*conn->co_proc));
2419 if (conn->co_proc == NULL) {
2420 syslog(LOG_ERR, "realloc: %m");
2421 exit(EX_OSERR);
2422 }
2423 if (conn->co_numchild > maxpip)
2424 conn->co_numchild = maxpip;
2425 }
2426 }
2427 }
2428
2429 static void
2430 free_connlist(struct servtab *sep)
2431 {
2432 struct conninfo *conn;
2433 int i, j;
2434
2435 for (i = 0; i < PERIPSIZE; ++i) {
2436 while ((conn = LIST_FIRST(&sep->se_conn[i])) != NULL) {
2437 for (j = 0; j < conn->co_numchild; ++j)
2438 free_proc(conn->co_proc[j]);
2439 conn->co_numchild = 0;
2440 free_conn(conn);
2441 }
2442 }
2443 }
2444
2445 static void
2446 free_conn(struct conninfo *conn)
2447 {
2448 if (conn == NULL)
2449 return;
2450 if (conn->co_numchild <= 0) {
2451 LIST_REMOVE(conn, co_link);
2452 free(conn->co_proc);
2453 free(conn);
2454 }
2455 }
2456
2457 static struct procinfo *
2458 search_proc(pid_t pid, int add)
2459 {
2460 struct procinfo *proc;
2461 int hv;
2462
2463 hv = hashval((char *)&pid, sizeof(pid));
2464 LIST_FOREACH(proc, &proctable[hv], pr_link) {
2465 if (proc->pr_pid == pid)
2466 break;
2467 }
2468 if (proc == NULL && add) {
2469 if ((proc = malloc(sizeof(struct procinfo))) == NULL) {
2470 syslog(LOG_ERR, "malloc: %m");
2471 exit(EX_OSERR);
2472 }
2473 proc->pr_pid = pid;
2474 proc->pr_conn = NULL;
2475 LIST_INSERT_HEAD(&proctable[hv], proc, pr_link);
2476 }
2477 return proc;
2478 }
2479
2480 static void
2481 free_proc(struct procinfo *proc)
2482 {
2483 if (proc == NULL)
2484 return;
2485 LIST_REMOVE(proc, pr_link);
2486 free(proc);
2487 }
2488
2489 static int
2490 hashval(char *p, int len)
2491 {
2492 int i, hv = 0xABC3D20F;
2493
2494 for (i = 0; i < len; ++i, ++p)
2495 hv = (hv << 5) ^ (hv >> 23) ^ *p;
2496 hv = (hv ^ (hv >> 16)) & (PERIPSIZE - 1);
2497 return hv;
2498 }
DragonFly BSD