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hack(6): Separate hostprog.
[dragonfly.git] / usr.sbin / inetd / inetd.c
blob94de4d9365808efebb33fc2733cd5345dd8e0d66
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][/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 #include <sys/param.h>
94 #include <sys/ioctl.h>
95 #include <sys/wait.h>
96 #include <sys/time.h>
97 #include <sys/resource.h>
98 #include <sys/stat.h>
99 #include <sys/un.h>
100
101 #include <netinet/in.h>
102 #include <netinet/tcp.h>
103 #include <arpa/inet.h>
104 #include <rpc/rpc.h>
105 #include <rpc/pmap_clnt.h>
106
107 #include <errno.h>
108 #include <err.h>
109 #include <fcntl.h>
110 #include <grp.h>
111 #include <limits.h>
112 #include <netdb.h>
113 #include <pwd.h>
114 #include <signal.h>
115 #include <stdio.h>
116 #include <stdlib.h>
117 #include <string.h>
118 #include <syslog.h>
119 #include <tcpd.h>
120 #include <unistd.h>
121 #include <libutil.h>
122 #include <sysexits.h>
123 #include <ctype.h>
124
125 #include "inetd.h"
126 #include "pathnames.h"
127
128 /* wrapper for KAME-special getnameinfo() */
129 #ifndef NI_WITHSCOPEID
130 #define NI_WITHSCOPEID 0
131 #endif
132
133 #ifndef LIBWRAP_ALLOW_FACILITY
134 # define LIBWRAP_ALLOW_FACILITY LOG_AUTH
135 #endif
136 #ifndef LIBWRAP_ALLOW_SEVERITY
137 # define LIBWRAP_ALLOW_SEVERITY LOG_INFO
138 #endif
139 #ifndef LIBWRAP_DENY_FACILITY
140 # define LIBWRAP_DENY_FACILITY LOG_AUTH
141 #endif
142 #ifndef LIBWRAP_DENY_SEVERITY
143 # define LIBWRAP_DENY_SEVERITY LOG_WARNING
144 #endif
145
146 #define ISWRAP(sep) \
147 ( ((wrap_ex && !(sep)->se_bi) || (wrap_bi && (sep)->se_bi)) \
148 && (sep->se_family == AF_INET || sep->se_family == AF_INET6) \
149 && ( ((sep)->se_accept && (sep)->se_socktype == SOCK_STREAM) \
150 || (sep)->se_socktype == SOCK_DGRAM))
151
152 #ifdef LOGIN_CAP
153 #include <login_cap.h>
154
155 /* see init.c */
156 #define RESOURCE_RC "daemon"
157
158 #endif
159
160 #ifndef MAXCHILD
161 #define MAXCHILD -1 /* maximum number of this service
162 < 0 = no limit */
163 #endif
164
165 #ifndef MAXCPM
166 #define MAXCPM -1 /* rate limit invocations from a
167 single remote address,
168 < 0 = no limit */
169 #endif
170
171 #ifndef MAXPERIP
172 #define MAXPERIP -1 /* maximum number of this service
173 from a single remote address,
174 < 0 = no limit */
175 #endif
176
177 #ifndef TOOMANY
178 #define TOOMANY 256 /* don't start more than TOOMANY */
179 #endif
180 #define CNT_INTVL 60 /* servers in CNT_INTVL sec. */
181 #define RETRYTIME (60*10) /* retry after bind or server fail */
182 #define MAX_MAXCHLD 32767 /* max allowable max children */
183
184 #define SIGBLOCK (sigmask(SIGCHLD)|sigmask(SIGHUP)|sigmask(SIGALRM))
185
186 void close_sep(struct servtab *);
187 void flag_signal(int);
188 void flag_config(int);
189 void config(void);
190 int cpmip(const struct servtab *, int);
191 void endconfig(void);
192 struct servtab *enter(struct servtab *);
193 void freeconfig(struct servtab *);
194 struct servtab *getconfigent(void);
195 int matchservent(const char *, const char *, const char *);
196 char *nextline(FILE *);
197 void addchild(struct servtab *, int);
198 void flag_reapchild(int);
199 void reapchild(void);
200 void enable(struct servtab *);
201 void disable(struct servtab *);
202 void flag_retry(int);
203 void retry(void);
204 int setconfig(void);
205 void setup(struct servtab *);
206 void unregisterrpc(struct servtab *sep);
207 static struct conninfo *search_conn(struct servtab *sep, int ctrl);
208 static int room_conn(struct servtab *sep, struct conninfo *conn);
209 static void addchild_conn(struct conninfo *conn, pid_t pid);
210 static void reapchild_conn(pid_t pid);
211 static void free_conn(struct conninfo *conn);
212 static void resize_conn(struct servtab *sep, int maxperip);
213 static void free_connlist(struct servtab *sep);
214 static void free_proc(struct procinfo *);
215 static struct procinfo *search_proc(pid_t pid, int add);
216 static int hashval(char *p, int len);
217
218 int allow_severity;
219 int deny_severity;
220 int wrap_ex = 0;
221 int wrap_bi = 0;
222 int debug = 0;
223 int dolog = 0;
224 int maxsock; /* highest-numbered descriptor */
225 fd_set allsock;
226 int options;
227 int timingout;
228 int toomany = TOOMANY;
229 int maxchild = MAXCHILD;
230 int maxcpm = MAXCPM;
231 int maxperip = MAXPERIP;
232 struct servent *sp;
233 struct rpcent *rpc;
234 char *hostname = NULL;
235 struct sockaddr_in *bind_sa4;
236 int no_v4bind = 1;
237 #ifdef INET6
238 struct sockaddr_in6 *bind_sa6;
239 int no_v6bind = 1;
240 #endif
241 int signalpipe[2];
242 #ifdef SANITY_CHECK
243 int nsock;
244 #endif
245 uid_t euid;
246 gid_t egid;
247 mode_t mask;
248
249 struct servtab *servtab;
250
251 extern struct biltin biltins[];
252
253 #define NUMINT (sizeof(intab) / sizeof(struct inent))
254 const char *CONFIG = _PATH_INETDCONF;
255 const char *pid_file = _PATH_INETDPID;
256
257 static LIST_HEAD(, procinfo) proctable[PERIPSIZE];
258
259 int
260 getvalue(const char *arg, int *value, const char *whine)
261 {
262 int tmp;
263 char *p;
264
265 tmp = strtol(arg, &p, 0);
266 if (tmp < 0 || *p) {
267 syslog(LOG_ERR, whine, arg);
268 return 1; /* failure */
269 }
270 *value = tmp;
271 return 0; /* success */
272 }
273
274 static sa_family_t
275 whichaf(struct request_info *req)
276 {
277 struct sockaddr *sa;
278
279 sa = (struct sockaddr *)req->client->sin;
280 if (sa == NULL)
281 return AF_UNSPEC;
282 if (sa->sa_family == AF_INET6 &&
283 IN6_IS_ADDR_V4MAPPED(&((struct sockaddr_in6 *)sa)->sin6_addr))
284 return AF_INET;
285 return sa->sa_family;
286 }
287
288 int
289 main(int argc, char **argv)
290 {
291 struct servtab *sep;
292 struct passwd *pwd;
293 struct group *grp;
294 struct sigaction sa, saalrm, sachld, sahup, sapipe;
295 int ch, dofork;
296 pid_t pid;
297 char buf[50];
298 #ifdef LOGIN_CAP
299 login_cap_t *lc = NULL;
300 #endif
301 struct request_info req;
302 int denied;
303 char *service = NULL;
304 union {
305 struct sockaddr peer_un;
306 struct sockaddr_in peer_un4;
307 struct sockaddr_in6 peer_un6;
308 struct sockaddr_storage peer_max;
309 } p_un;
310 #define peer p_un.peer_un
311 #define peer4 p_un.peer_un4
312 #define peer6 p_un.peer_un6
313 #define peermax p_un.peer_max
314 int i;
315 struct addrinfo hints, *res;
316 const char *servname;
317 int error;
318 struct conninfo *conn;
319
320 openlog("inetd", LOG_PID | LOG_NOWAIT | LOG_PERROR, LOG_DAEMON);
321
322 while ((ch = getopt(argc, argv, "dlwWR:a:c:C:p:s:")) != -1)
323 switch(ch) {
324 case 'd':
325 debug = 1;
326 options |= SO_DEBUG;
327 break;
328 case 'l':
329 dolog = 1;
330 break;
331 case 'R':
332 getvalue(optarg, &toomany,
333 "-R %s: bad value for service invocation rate");
334 break;
335 case 'c':
336 getvalue(optarg, &maxchild,
337 "-c %s: bad value for maximum children");
338 break;
339 case 'C':
340 getvalue(optarg, &maxcpm,
341 "-C %s: bad value for maximum children/minute");
342 break;
343 case 'a':
344 hostname = optarg;
345 break;
346 case 'p':
347 pid_file = optarg;
348 break;
349 case 's':
350 getvalue(optarg, &maxperip,
351 "-s %s: bad value for maximum children per source address");
352 break;
353 case 'w':
354 wrap_ex++;
355 break;
356 case 'W':
357 wrap_bi++;
358 break;
359 case '?':
360 default:
361 syslog(LOG_ERR,
362 "usage: inetd [-dlwW] [-a address] [-R rate]"
363 " [-c maximum] [-C rate]"
364 " [-p pidfile] [conf-file]");
365 exit(EX_USAGE);
366 }
367 /*
368 * Initialize Bind Addrs.
369 * When hostname is NULL, wild card bind addrs are obtained from
370 * getaddrinfo(). But getaddrinfo() requires at least one of
371 * hostname or servname is non NULL.
372 * So when hostname is NULL, set dummy value to servname.
373 */
374 servname = (hostname == NULL) ? "discard" /* dummy */ : NULL;
375
376 bzero(&hints, sizeof(struct addrinfo));
377 hints.ai_flags = AI_PASSIVE;
378 hints.ai_family = AF_UNSPEC;
379 error = getaddrinfo(hostname, servname, &hints, &res);
380 if (error != 0) {
381 syslog(LOG_ERR, "-a %s: %s", hostname, gai_strerror(error));
382 if (error == EAI_SYSTEM)
383 syslog(LOG_ERR, "%s", strerror(errno));
384 exit(EX_USAGE);
385 }
386 do {
387 if (res->ai_addr == NULL) {
388 syslog(LOG_ERR, "-a %s: getaddrinfo failed", hostname);
389 exit(EX_USAGE);
390 }
391 switch (res->ai_addr->sa_family) {
392 case AF_INET:
393 if (no_v4bind == 0)
394 continue;
395 bind_sa4 = (struct sockaddr_in *)res->ai_addr;
396 /* init port num in case servname is dummy */
397 bind_sa4->sin_port = 0;
398 no_v4bind = 0;
399 continue;
400 #ifdef INET6
401 case AF_INET6:
402 if (no_v6bind == 0)
403 continue;
404 bind_sa6 = (struct sockaddr_in6 *)res->ai_addr;
405 /* init port num in case servname is dummy */
406 bind_sa6->sin6_port = 0;
407 no_v6bind = 0;
408 continue;
409 #endif
410 }
411 if (no_v4bind == 0
412 #ifdef INET6
413 && no_v6bind == 0
414 #endif
415 )
416 break;
417 } while ((res = res->ai_next) != NULL);
418 if (no_v4bind != 0
419 #ifdef INET6
420 && no_v6bind != 0
421 #endif
422 ) {
423 syslog(LOG_ERR, "-a %s: unknown address family", hostname);
424 exit(EX_USAGE);
425 }
426
427 euid = geteuid();
428 egid = getegid();
429 umask(mask = umask(0777));
430
431 argc -= optind;
432 argv += optind;
433
434 if (argc > 0)
435 CONFIG = argv[0];
436 if (debug == 0) {
437 FILE *fp;
438 if (daemon(0, 0) < 0) {
439 syslog(LOG_WARNING, "daemon(0,0) failed: %m");
440 }
441 /* From now on we don't want syslog messages going to stderr. */
442 closelog();
443 openlog("inetd", LOG_PID | LOG_NOWAIT, LOG_DAEMON);
444 /*
445 * In case somebody has started inetd manually, we need to
446 * clear the logname, so that old servers run as root do not
447 * get the user's logname..
448 */
449 if (setlogin("") < 0) {
450 syslog(LOG_WARNING, "cannot clear logname: %m");
451 /* no big deal if it fails.. */
452 }
453 pid = getpid();
454 fp = fopen(pid_file, "w");
455 if (fp) {
456 fprintf(fp, "%ld\n", (long)pid);
457 fclose(fp);
458 } else {
459 syslog(LOG_WARNING, "%s: %m", pid_file);
460 }
461 }
462 for (i = 0; i < PERIPSIZE; ++i)
463 LIST_INIT(&proctable[i]);
464 sa.sa_flags = 0;
465 sigemptyset(&sa.sa_mask);
466 sigaddset(&sa.sa_mask, SIGALRM);
467 sigaddset(&sa.sa_mask, SIGCHLD);
468 sigaddset(&sa.sa_mask, SIGHUP);
469 sa.sa_handler = flag_retry;
470 sigaction(SIGALRM, &sa, &saalrm);
471 config();
472 sa.sa_handler = flag_config;
473 sigaction(SIGHUP, &sa, &sahup);
474 sa.sa_handler = flag_reapchild;
475 sigaction(SIGCHLD, &sa, &sachld);
476 sa.sa_handler = SIG_IGN;
477 sigaction(SIGPIPE, &sa, &sapipe);
478
479 {
480 /* space for daemons to overwrite environment for ps */
481 #define DUMMYSIZE 100
482 char dummy[DUMMYSIZE];
483
484 memset(dummy, 'x', DUMMYSIZE - 1);
485 dummy[DUMMYSIZE - 1] = '\0';
486 if (setenv("inetd_dummy", dummy, 1) == -1)
487 syslog(LOG_WARNING, "setenv: cannot set inetd_dummy=%s: %m", dummy);
488
489 }
490
491 if (pipe(signalpipe) != 0) {
492 syslog(LOG_ERR, "pipe: %m");
493 exit(EX_OSERR);
494 }
495 if (fcntl(signalpipe[0], F_SETFD, FD_CLOEXEC) < 0 ||
496 fcntl(signalpipe[1], F_SETFD, FD_CLOEXEC) < 0) {
497 syslog(LOG_ERR, "signalpipe: fcntl (F_SETFD, FD_CLOEXEC): %m");
498 exit(EX_OSERR);
499 }
500 FD_SET(signalpipe[0], &allsock);
501 #ifdef SANITY_CHECK
502 nsock++;
503 #endif
504 if (signalpipe[0] > maxsock)
505 maxsock = signalpipe[0];
506 if (signalpipe[1] > maxsock)
507 maxsock = signalpipe[1];
508
509 for (;;) {
510 int n, ctrl;
511 fd_set readable;
512
513 #ifdef SANITY_CHECK
514 if (nsock == 0) {
515 syslog(LOG_ERR, "%s: nsock=0", __func__);
516 exit(EX_SOFTWARE);
517 }
518 #endif
519 readable = allsock;
520 if ((n = select(maxsock + 1, &readable, NULL, NULL, NULL)) <= 0) {
521 if (n < 0 && errno != EINTR) {
522 syslog(LOG_WARNING, "select: %m");
523 sleep(1);
524 }
525 continue;
526 }
527 /* handle any queued signal flags */
528 if (FD_ISSET(signalpipe[0], &readable)) {
529 int nsig;
530 if (ioctl(signalpipe[0], FIONREAD, &nsig) != 0) {
531 syslog(LOG_ERR, "ioctl: %m");
532 exit(EX_OSERR);
533 }
534 while (--nsig >= 0) {
535 char c;
536 if (read(signalpipe[0], &c, 1) != 1) {
537 syslog(LOG_ERR, "read: %m");
538 exit(EX_OSERR);
539 }
540 if (debug)
541 warnx("handling signal flag %c", c);
542 switch(c) {
543 case 'A': /* sigalrm */
544 retry();
545 break;
546 case 'C': /* sigchld */
547 reapchild();
548 break;
549 case 'H': /* sighup */
550 config();
551 break;
552 }
553 }
554 }
555 for (sep = servtab; n && sep; sep = sep->se_next)
556 if (sep->se_fd != -1 && FD_ISSET(sep->se_fd, &readable)) {
557 n--;
558 if (debug)
559 warnx("someone wants %s", sep->se_service);
560 dofork = !sep->se_bi || sep->se_bi->bi_fork || ISWRAP(sep);
561 conn = NULL;
562 if (sep->se_accept && sep->se_socktype == SOCK_STREAM) {
563 i = 1;
564 if (ioctl(sep->se_fd, FIONBIO, &i) < 0)
565 syslog(LOG_ERR, "ioctl (FIONBIO, 1): %m");
566 ctrl = accept(sep->se_fd, NULL, NULL);
567 if (debug)
568 warnx("accept, ctrl %d", ctrl);
569 if (ctrl < 0) {
570 if (errno != EINTR)
571 syslog(LOG_WARNING,
572 "accept (for %s): %m",
573 sep->se_service);
574 if (sep->se_accept &&
575 sep->se_socktype == SOCK_STREAM)
576 close(ctrl);
577 continue;
578 }
579 i = 0;
580 if (ioctl(sep->se_fd, FIONBIO, &i) < 0)
581 syslog(LOG_ERR, "ioctl1(FIONBIO, 0): %m");
582 if (ioctl(ctrl, FIONBIO, &i) < 0)
583 syslog(LOG_ERR, "ioctl2(FIONBIO, 0): %m");
584 if (cpmip(sep, ctrl) < 0) {
585 close(ctrl);
586 continue;
587 }
588 if (dofork &&
589 (conn = search_conn(sep, ctrl)) != NULL &&
590 !room_conn(sep, conn)) {
591 close(ctrl);
592 continue;
593 }
594 } else
595 ctrl = sep->se_fd;
596 if (dolog && !ISWRAP(sep)) {
597 char pname[INET6_ADDRSTRLEN] = "unknown";
598 socklen_t sl;
599 sl = sizeof peermax;
600 if (getpeername(ctrl, (struct sockaddr *)
601 &peermax, &sl)) {
602 sl = sizeof peermax;
603 if (recvfrom(ctrl, buf, sizeof(buf),
604 MSG_PEEK,
605 (struct sockaddr *)&peermax,
606 &sl) >= 0) {
607 getnameinfo((struct sockaddr *)&peermax,
608 peer.sa_len,
609 pname, sizeof(pname),
610 NULL, 0,
611 NI_NUMERICHOST|
612 NI_WITHSCOPEID);
613 }
614 } else {
615 getnameinfo((struct sockaddr *)&peermax,
616 peer.sa_len,
617 pname, sizeof(pname),
618 NULL, 0,
619 NI_NUMERICHOST|
620 NI_WITHSCOPEID);
621 }
622 syslog(LOG_INFO,"%s from %s", sep->se_service, pname);
623 }
624 sigblock(SIGBLOCK);
625 pid = 0;
626 /*
627 * Fork for all external services, builtins which need to
628 * fork and anything we're wrapping (as wrapping might
629 * block or use hosts_options(5) twist).
630 */
631 if (dofork) {
632 if (sep->se_count++ == 0)
633 gettimeofday(&sep->se_time, NULL);
634 else if (toomany > 0 && sep->se_count >= toomany) {
635 struct timeval now;
636
637 gettimeofday(&now, NULL);
638 if (now.tv_sec - sep->se_time.tv_sec >
639 CNT_INTVL) {
640 sep->se_time = now;
641 sep->se_count = 1;
642 } else {
643 syslog(LOG_ERR,
644 "%s/%s server failing (looping), service terminated",
645 sep->se_service, sep->se_proto);
646 if (sep->se_accept &&
647 sep->se_socktype == SOCK_STREAM)
648 close(ctrl);
649 close_sep(sep);
650 free_conn(conn);
651 sigsetmask(0L);
652 if (!timingout) {
653 timingout = 1;
654 alarm(RETRYTIME);
655 }
656 continue;
657 }
658 }
659 pid = fork();
660 }
661 if (pid < 0) {
662 syslog(LOG_ERR, "fork: %m");
663 if (sep->se_accept &&
664 sep->se_socktype == SOCK_STREAM)
665 close(ctrl);
666 free_conn(conn);
667 sigsetmask(0L);
668 sleep(1);
669 continue;
670 }
671 if (pid) {
672 addchild_conn(conn, pid);
673 addchild(sep, pid);
674 }
675 sigsetmask(0L);
676 if (pid == 0) {
677 if (dofork) {
678 sigaction(SIGALRM, &saalrm, NULL);
679 sigaction(SIGCHLD, &sachld, NULL);
680 sigaction(SIGHUP, &sahup, NULL);
681 /* SIGPIPE reset before exec */
682 }
683 /*
684 * Call tcpmux to find the real service to exec.
685 */
686 if (sep->se_bi &&
687 sep->se_bi->bi_fn == (bi_fn_t *) tcpmux) {
688 sep = tcpmux(ctrl);
689 if (sep == NULL) {
690 close(ctrl);
691 _exit(0);
692 }
693 }
694 if (ISWRAP(sep)) {
695 inetd_setproctitle("wrapping", ctrl);
696 service = sep->se_server_name ?
697 sep->se_server_name : sep->se_service;
698 request_init(&req, RQ_DAEMON, service, RQ_FILE, ctrl, NULL);
699 fromhost(&req);
700 deny_severity = LIBWRAP_DENY_FACILITY|LIBWRAP_DENY_SEVERITY;
701 allow_severity = LIBWRAP_ALLOW_FACILITY|LIBWRAP_ALLOW_SEVERITY;
702 denied = !hosts_access(&req);
703 if (denied) {
704 syslog(deny_severity,
705 "refused connection from %.500s, service %s (%s%s)",
706 eval_client(&req), service, sep->se_proto,
707 (whichaf(&req) == AF_INET6) ? "6" : "");
708 if (sep->se_socktype != SOCK_STREAM)
709 recv(ctrl, buf, sizeof (buf), 0);
710 if (dofork) {
711 sleep(1);
712 _exit(0);
713 }
714 }
715 if (dolog) {
716 syslog(allow_severity,
717 "connection from %.500s, service %s (%s%s)",
718 eval_client(&req), service, sep->se_proto,
719 (whichaf(&req) == AF_INET6) ? "6" : "");
720 }
721 }
722 if (sep->se_bi) {
723 (*sep->se_bi->bi_fn)(ctrl, sep);
724 } else {
725 if (debug)
726 warnx("%d execl %s",
727 getpid(), sep->se_server);
728 /* Clear close-on-exec. */
729 if (fcntl(ctrl, F_SETFD, 0) < 0) {
730 syslog(LOG_ERR,
731 "%s/%s: fcntl (F_SETFD, 0): %m",
732 sep->se_service, sep->se_proto);
733 _exit(EX_OSERR);
734 }
735 if (ctrl != 0) {
736 dup2(ctrl, 0);
737 close(ctrl);
738 }
739 dup2(0, 1);
740 dup2(0, 2);
741 if ((pwd = getpwnam(sep->se_user)) == NULL) {
742 syslog(LOG_ERR,
743 "%s/%s: %s: no such user",
744 sep->se_service, sep->se_proto,
745 sep->se_user);
746 if (sep->se_socktype != SOCK_STREAM)
747 recv(0, buf, sizeof (buf), 0);
748 _exit(EX_NOUSER);
749 }
750 grp = NULL;
751 if ( sep->se_group != NULL
752 && (grp = getgrnam(sep->se_group)) == NULL
753 ) {
754 syslog(LOG_ERR,
755 "%s/%s: %s: no such group",
756 sep->se_service, sep->se_proto,
757 sep->se_group);
758 if (sep->se_socktype != SOCK_STREAM)
759 recv(0, buf, sizeof (buf), 0);
760 _exit(EX_NOUSER);
761 }
762 if (grp != NULL)
763 pwd->pw_gid = grp->gr_gid;
764 #ifdef LOGIN_CAP
765 if ((lc = login_getclass(sep->se_class)) == NULL) {
766 /* error syslogged by getclass */
767 syslog(LOG_ERR,
768 "%s/%s: %s: login class error",
769 sep->se_service, sep->se_proto,
770 sep->se_class);
771 if (sep->se_socktype != SOCK_STREAM)
772 recv(0, buf, sizeof (buf), 0);
773 _exit(EX_NOUSER);
774 }
775 #endif
776 if (setsid() < 0) {
777 syslog(LOG_ERR,
778 "%s: can't setsid(): %m",
779 sep->se_service);
780 /* _exit(EX_OSERR); not fatal yet */
781 }
782 #ifdef LOGIN_CAP
783 if (setusercontext(lc, pwd, pwd->pw_uid,
784 LOGIN_SETALL) != 0) {
785 syslog(LOG_ERR,
786 "%s: can't setusercontext(..%s..): %m",
787 sep->se_service, sep->se_user);
788 _exit(EX_OSERR);
789 }
790 login_close(lc);
791 #else
792 if (pwd->pw_uid) {
793 if (setlogin(sep->se_user) < 0) {
794 syslog(LOG_ERR,
795 "%s: can't setlogin(%s): %m",
796 sep->se_service, sep->se_user);
797 /* _exit(EX_OSERR); not yet */
798 }
799 if (setgid(pwd->pw_gid) < 0) {
800 syslog(LOG_ERR,
801 "%s: can't set gid %d: %m",
802 sep->se_service, pwd->pw_gid);
803 _exit(EX_OSERR);
804 }
805 initgroups(pwd->pw_name,
806 pwd->pw_gid);
807 if (setuid(pwd->pw_uid) < 0) {
808 syslog(LOG_ERR,
809 "%s: can't set uid %d: %m",
810 sep->se_service, pwd->pw_uid);
811 _exit(EX_OSERR);
812 }
813 }
814 #endif
815 sigaction(SIGPIPE, &sapipe, NULL);
816 execv(sep->se_server, sep->se_argv);
817 syslog(LOG_ERR,
818 "cannot execute %s: %m", sep->se_server);
819 if (sep->se_socktype != SOCK_STREAM)
820 recv(0, buf, sizeof (buf), 0);
821 }
822 if (dofork)
823 _exit(0);
824 }
825 if (sep->se_accept && sep->se_socktype == SOCK_STREAM)
826 close(ctrl);
827 }
828 }
829 }
830
831 /*
832 * Add a signal flag to the signal flag queue for later handling
833 */
834
835 void
836 flag_signal(int c)
837 {
838 char ch = c;
839
840 if (write(signalpipe[1], &ch, 1) != 1) {
841 syslog(LOG_ERR, "write: %m");
842 _exit(EX_OSERR);
843 }
844 }
845
846 /*
847 * Record a new child pid for this service. If we've reached the
848 * limit on children, then stop accepting incoming requests.
849 */
850
851 void
852 addchild(struct servtab *sep, pid_t pid)
853 {
854 if (sep->se_maxchild <= 0)
855 return;
856 #ifdef SANITY_CHECK
857 if (sep->se_numchild >= sep->se_maxchild) {
858 syslog(LOG_ERR, "%s: %d >= %d",
859 __func__, sep->se_numchild, sep->se_maxchild);
860 exit(EX_SOFTWARE);
861 }
862 #endif
863 sep->se_pids[sep->se_numchild++] = pid;
864 if (sep->se_numchild == sep->se_maxchild)
865 disable(sep);
866 }
867
868 /*
869 * Some child process has exited. See if it's on somebody's list.
870 */
871
872 void
873 flag_reapchild(int signo __unused)
874 {
875 flag_signal('C');
876 }
877
878 void
879 reapchild(void)
880 {
881 int k, status;
882 pid_t pid;
883 struct servtab *sep;
884
885 for (;;) {
886 pid = wait3(&status, WNOHANG, NULL);
887 if (pid <= 0)
888 break;
889 if (debug)
890 warnx("%d reaped, %s %u", pid,
891 WIFEXITED(status) ? "status" : "signal",
892 WIFEXITED(status) ? WEXITSTATUS(status)
893 : WTERMSIG(status));
894 for (sep = servtab; sep; sep = sep->se_next) {
895 for (k = 0; k < sep->se_numchild; k++)
896 if (sep->se_pids[k] == pid)
897 break;
898 if (k == sep->se_numchild)
899 continue;
900 if (sep->se_numchild == sep->se_maxchild)
901 enable(sep);
902 sep->se_pids[k] = sep->se_pids[--sep->se_numchild];
903 if (WIFSIGNALED(status) || WEXITSTATUS(status))
904 syslog(LOG_WARNING,
905 "%s[%d]: exited, %s %u",
906 sep->se_server, pid,
907 WIFEXITED(status) ? "status" : "signal",
908 WIFEXITED(status) ? WEXITSTATUS(status)
909 : WTERMSIG(status));
910 break;
911 }
912 reapchild_conn(pid);
913 }
914 }
915
916 void
917 flag_config(int signo __unused)
918 {
919 flag_signal('H');
920 }
921
922 void
923 config(void)
924 {
925 struct servtab *sep, *new, **sepp;
926 long omask;
927 #ifdef LOGIN_CAP
928 login_cap_t *lc = NULL;
929 #endif
930
931
932 if (!setconfig()) {
933 syslog(LOG_ERR, "%s: %m", CONFIG);
934 return;
935 }
936 for (sep = servtab; sep; sep = sep->se_next)
937 sep->se_checked = 0;
938 while ((new = getconfigent())) {
939 if (getpwnam(new->se_user) == NULL) {
940 syslog(LOG_ERR,
941 "%s/%s: no such user '%s', service ignored",
942 new->se_service, new->se_proto, new->se_user);
943 continue;
944 }
945 if (new->se_group && getgrnam(new->se_group) == NULL) {
946 syslog(LOG_ERR,
947 "%s/%s: no such group '%s', service ignored",
948 new->se_service, new->se_proto, new->se_group);
949 continue;
950 }
951 #ifdef LOGIN_CAP
952 if ((lc = login_getclass(new->se_class)) == NULL) {
953 /* error syslogged by getclass */
954 syslog(LOG_ERR,
955 "%s/%s: %s: login class error, service ignored",
956 new->se_service, new->se_proto, new->se_class);
957 continue;
958 }
959 login_close(lc);
960 #endif
961 for (sep = servtab; sep; sep = sep->se_next)
962 if (strcmp(sep->se_service, new->se_service) == 0 &&
963 strcmp(sep->se_proto, new->se_proto) == 0 &&
964 sep->se_socktype == new->se_socktype &&
965 sep->se_family == new->se_family)
966 break;
967 if (sep != NULL) {
968 int i;
969
970 #define SWAP(a, b) { typeof(a) c = a; a = b; b = c; }
971 omask = sigblock(SIGBLOCK);
972 if (sep->se_nomapped != new->se_nomapped) {
973 sep->se_nomapped = new->se_nomapped;
974 sep->se_reset = 1;
975 }
976 /* copy over outstanding child pids */
977 if (sep->se_maxchild > 0 && new->se_maxchild > 0) {
978 new->se_numchild = sep->se_numchild;
979 if (new->se_numchild > new->se_maxchild)
980 new->se_numchild = new->se_maxchild;
981 memcpy(new->se_pids, sep->se_pids,
982 new->se_numchild * sizeof(*new->se_pids));
983 }
984 SWAP(sep->se_pids, new->se_pids);
985 sep->se_maxchild = new->se_maxchild;
986 sep->se_numchild = new->se_numchild;
987 sep->se_maxcpm = new->se_maxcpm;
988 resize_conn(sep, new->se_maxperip);
989 sep->se_maxperip = new->se_maxperip;
990 sep->se_bi = new->se_bi;
991 /* might need to turn on or off service now */
992 if (sep->se_fd >= 0) {
993 if (sep->se_maxchild > 0
994 && sep->se_numchild == sep->se_maxchild) {
995 if (FD_ISSET(sep->se_fd, &allsock))
996 disable(sep);
997 } else {
998 if (!FD_ISSET(sep->se_fd, &allsock))
999 enable(sep);
1000 }
1001 }
1002 sep->se_accept = new->se_accept;
1003 SWAP(sep->se_user, new->se_user);
1004 SWAP(sep->se_group, new->se_group);
1005 #ifdef LOGIN_CAP
1006 SWAP(sep->se_class, new->se_class);
1007 #endif
1008 SWAP(sep->se_server, new->se_server);
1009 SWAP(sep->se_server_name, new->se_server_name);
1010 for (i = 0; i < MAXARGV; i++)
1011 SWAP(sep->se_argv[i], new->se_argv[i]);
1012 sigsetmask(omask);
1013 freeconfig(new);
1014 if (debug)
1015 print_service("REDO", sep);
1016 } else {
1017 sep = enter(new);
1018 if (debug)
1019 print_service("ADD ", sep);
1020 }
1021 sep->se_checked = 1;
1022 if (ISMUX(sep)) {
1023 sep->se_fd = -1;
1024 continue;
1025 }
1026 switch (sep->se_family) {
1027 case AF_INET:
1028 if (no_v4bind != 0) {
1029 sep->se_fd = -1;
1030 continue;
1031 }
1032 break;
1033 #ifdef INET6
1034 case AF_INET6:
1035 if (no_v6bind != 0) {
1036 sep->se_fd = -1;
1037 continue;
1038 }
1039 break;
1040 #endif
1041 }
1042 if (!sep->se_rpc) {
1043 if (sep->se_family != AF_UNIX) {
1044 sp = getservbyname(sep->se_service, sep->se_proto);
1045 if (sp == NULL) {
1046 syslog(LOG_ERR, "%s/%s: unknown service",
1047 sep->se_service, sep->se_proto);
1048 sep->se_checked = 0;
1049 continue;
1050 }
1051 }
1052 switch (sep->se_family) {
1053 case AF_INET:
1054 if (sp->s_port != sep->se_ctrladdr4.sin_port) {
1055 sep->se_ctrladdr4.sin_port =
1056 sp->s_port;
1057 sep->se_reset = 1;
1058 }
1059 break;
1060 #ifdef INET6
1061 case AF_INET6:
1062 if (sp->s_port !=
1063 sep->se_ctrladdr6.sin6_port) {
1064 sep->se_ctrladdr6.sin6_port =
1065 sp->s_port;
1066 sep->se_reset = 1;
1067 }
1068 break;
1069 #endif
1070 }
1071 if (sep->se_reset != 0 && sep->se_fd >= 0)
1072 close_sep(sep);
1073 } else {
1074 rpc = getrpcbyname(sep->se_service);
1075 if (rpc == NULL) {
1076 syslog(LOG_ERR, "%s/%s unknown RPC service",
1077 sep->se_service, sep->se_proto);
1078 if (sep->se_fd != -1)
1079 close(sep->se_fd);
1080 sep->se_fd = -1;
1081 continue;
1082 }
1083 if (rpc->r_number != sep->se_rpc_prog) {
1084 if (sep->se_rpc_prog)
1085 unregisterrpc(sep);
1086 sep->se_rpc_prog = rpc->r_number;
1087 if (sep->se_fd != -1)
1088 close(sep->se_fd);
1089 sep->se_fd = -1;
1090 }
1091 }
1092 if (sep->se_fd == -1)
1093 setup(sep);
1094 }
1095 endconfig();
1096 /*
1097 * Purge anything not looked at above.
1098 */
1099 omask = sigblock(SIGBLOCK);
1100 sepp = &servtab;
1101 while ((sep = *sepp)) {
1102 if (sep->se_checked) {
1103 sepp = &sep->se_next;
1104 continue;
1105 }
1106 *sepp = sep->se_next;
1107 if (sep->se_fd >= 0)
1108 close_sep(sep);
1109 if (debug)
1110 print_service("FREE", sep);
1111 if (sep->se_rpc && sep->se_rpc_prog > 0)
1112 unregisterrpc(sep);
1113 freeconfig(sep);
1114 free(sep);
1115 }
1116 sigsetmask(omask);
1117 }
1118
1119 void
1120 unregisterrpc(struct servtab *sep)
1121 {
1122 u_int i;
1123 struct servtab *sepp;
1124 long omask;
1125
1126 omask = sigblock(SIGBLOCK);
1127 for (sepp = servtab; sepp; sepp = sepp->se_next) {
1128 if (sepp == sep)
1129 continue;
1130 if (sep->se_checked == 0 ||
1131 !sepp->se_rpc ||
1132 sep->se_rpc_prog != sepp->se_rpc_prog)
1133 continue;
1134 return;
1135 }
1136 if (debug)
1137 print_service("UNREG", sep);
1138 for (i = sep->se_rpc_lowvers; i <= sep->se_rpc_highvers; i++)
1139 pmap_unset(sep->se_rpc_prog, i);
1140 if (sep->se_fd != -1)
1141 close(sep->se_fd);
1142 sep->se_fd = -1;
1143 sigsetmask(omask);
1144 }
1145
1146 void
1147 flag_retry(int signo __unused)
1148 {
1149 flag_signal('A');
1150 }
1151
1152 void
1153 retry(void)
1154 {
1155 struct servtab *sep;
1156
1157 timingout = 0;
1158 for (sep = servtab; sep; sep = sep->se_next)
1159 if (sep->se_fd == -1 && !ISMUX(sep))
1160 setup(sep);
1161 }
1162
1163 void
1164 setup(struct servtab *sep)
1165 {
1166 int on = 1;
1167
1168 if ((sep->se_fd = socket(sep->se_family, sep->se_socktype, 0)) < 0) {
1169 if (debug)
1170 warn("socket failed on %s/%s",
1171 sep->se_service, sep->se_proto);
1172 syslog(LOG_ERR, "%s/%s: socket: %m",
1173 sep->se_service, sep->se_proto);
1174 return;
1175 }
1176 /* Set all listening sockets to close-on-exec. */
1177 if (fcntl(sep->se_fd, F_SETFD, FD_CLOEXEC) < 0) {
1178 syslog(LOG_ERR, "%s/%s: fcntl (F_SETFD, FD_CLOEXEC): %m",
1179 sep->se_service, sep->se_proto);
1180 close(sep->se_fd);
1181 return;
1182 }
1183 #define turnon(fd, opt) \
1184 setsockopt(fd, SOL_SOCKET, opt, (char *)&on, sizeof (on))
1185 if (strcmp(sep->se_proto, "tcp") == 0 && (options & SO_DEBUG) &&
1186 turnon(sep->se_fd, SO_DEBUG) < 0)
1187 syslog(LOG_ERR, "setsockopt (SO_DEBUG): %m");
1188 if (turnon(sep->se_fd, SO_REUSEADDR) < 0)
1189 syslog(LOG_ERR, "setsockopt (SO_REUSEADDR): %m");
1190 #ifdef SO_PRIVSTATE
1191 if (turnon(sep->se_fd, SO_PRIVSTATE) < 0)
1192 syslog(LOG_ERR, "setsockopt (SO_PRIVSTATE): %m");
1193 #endif
1194 /* tftpd opens a new connection then needs more infos */
1195 if ((sep->se_family == AF_INET6) &&
1196 (strcmp(sep->se_proto, "udp") == 0) &&
1197 (sep->se_accept == 0) &&
1198 (setsockopt(sep->se_fd, IPPROTO_IPV6, IPV6_PKTINFO,
1199 (char *)&on, sizeof (on)) < 0))
1200 syslog(LOG_ERR, "setsockopt (IPV6_RECVPKTINFO): %m");
1201 if (sep->se_family == AF_INET6) {
1202 int flag = sep->se_nomapped ? 1 : 0;
1203 if (setsockopt(sep->se_fd, IPPROTO_IPV6, IPV6_V6ONLY,
1204 (char *)&flag, sizeof (flag)) < 0)
1205 syslog(LOG_ERR, "setsockopt (IPV6_V6ONLY): %m");
1206 }
1207 #undef turnon
1208 if (sep->se_type == TTCP_TYPE)
1209 if (setsockopt(sep->se_fd, IPPROTO_TCP, TCP_NOPUSH,
1210 (char *)&on, sizeof (on)) < 0)
1211 syslog(LOG_ERR, "setsockopt (TCP_NOPUSH): %m");
1212 if (sep->se_family == AF_UNIX) {
1213 unlink(sep->se_ctrladdr_un.sun_path);
1214 umask(0777); /* Make socket with conservative permissions */
1215 }
1216 if (bind(sep->se_fd, (struct sockaddr *)&sep->se_ctrladdr,
1217 sep->se_ctrladdr_size) < 0) {
1218 if (debug)
1219 warn("bind failed on %s/%s",
1220 sep->se_service, sep->se_proto);
1221 syslog(LOG_ERR, "%s/%s: bind: %m",
1222 sep->se_service, sep->se_proto);
1223 close(sep->se_fd);
1224 sep->se_fd = -1;
1225 if (!timingout) {
1226 timingout = 1;
1227 alarm(RETRYTIME);
1228 }
1229 if (sep->se_family == AF_UNIX)
1230 umask(mask);
1231 return;
1232 }
1233 if (sep->se_family == AF_UNIX) {
1234 /* Ick - fch{own,mod} don't work on Unix domain sockets */
1235 if (chown(sep->se_service, sep->se_sockuid, sep->se_sockgid) < 0)
1236 syslog(LOG_ERR, "chown socket: %m");
1237 if (chmod(sep->se_service, sep->se_sockmode) < 0)
1238 syslog(LOG_ERR, "chmod socket: %m");
1239 umask(mask);
1240 }
1241 if (sep->se_rpc) {
1242 u_int i;
1243 socklen_t len = sep->se_ctrladdr_size;
1244
1245 if (sep->se_family != AF_INET) {
1246 syslog(LOG_ERR,
1247 "%s/%s: unsupported address family for rpc",
1248 sep->se_service, sep->se_proto);
1249 close(sep->se_fd);
1250 sep->se_fd = -1;
1251 return;
1252 }
1253 if (getsockname(sep->se_fd,
1254 (struct sockaddr*)&sep->se_ctrladdr, &len) < 0){
1255 syslog(LOG_ERR, "%s/%s: getsockname: %m",
1256 sep->se_service, sep->se_proto);
1257 close(sep->se_fd);
1258 sep->se_fd = -1;
1259 return;
1260 }
1261 if (debug)
1262 print_service("REG ", sep);
1263 for (i = sep->se_rpc_lowvers; i <= sep->se_rpc_highvers; i++) {
1264 pmap_unset(sep->se_rpc_prog, i);
1265 pmap_set(sep->se_rpc_prog, i,
1266 (sep->se_socktype == SOCK_DGRAM)
1267 ? IPPROTO_UDP : IPPROTO_TCP,
1268 ntohs(sep->se_ctrladdr4.sin_port));
1269 }
1270 }
1271 if (sep->se_socktype == SOCK_STREAM)
1272 listen(sep->se_fd, 64);
1273 enable(sep);
1274 if (debug) {
1275 warnx("registered %s on %d",
1276 sep->se_server, sep->se_fd);
1277 }
1278 }
1279
1280 /*
1281 * Finish with a service and its socket.
1282 */
1283 void
1284 close_sep(struct servtab *sep)
1285 {
1286 if (sep->se_fd >= 0) {
1287 if (FD_ISSET(sep->se_fd, &allsock))
1288 disable(sep);
1289 close(sep->se_fd);
1290 sep->se_fd = -1;
1291 }
1292 sep->se_count = 0;
1293 sep->se_numchild = 0; /* forget about any existing children */
1294 }
1295
1296 int
1297 matchservent(const char *name1, const char *name2, const char *proto)
1298 {
1299 char **alias, *p;
1300 struct servent *se;
1301
1302 if (strcmp(proto, "unix") == 0) {
1303 if ((p = strrchr(name1, '/')) != NULL)
1304 name1 = p + 1;
1305 if ((p = strrchr(name2, '/')) != NULL)
1306 name2 = p + 1;
1307 }
1308 if (strcmp(name1, name2) == 0)
1309 return(1);
1310 if ((se = getservbyname(name1, proto)) != NULL) {
1311 if (strcmp(name2, se->s_name) == 0)
1312 return(1);
1313 for (alias = se->s_aliases; *alias; alias++)
1314 if (strcmp(name2, *alias) == 0)
1315 return(1);
1316 }
1317 return(0);
1318 }
1319
1320 struct servtab *
1321 enter(struct servtab *cp)
1322 {
1323 struct servtab *sep;
1324 long omask;
1325
1326 sep = (struct servtab *)malloc(sizeof (*sep));
1327 if (sep == NULL) {
1328 syslog(LOG_ERR, "malloc: %m");
1329 exit(EX_OSERR);
1330 }
1331 *sep = *cp;
1332 sep->se_fd = -1;
1333 omask = sigblock(SIGBLOCK);
1334 sep->se_next = servtab;
1335 servtab = sep;
1336 sigsetmask(omask);
1337 return (sep);
1338 }
1339
1340 void
1341 enable(struct servtab *sep)
1342 {
1343 if (debug)
1344 warnx(
1345 "enabling %s, fd %d", sep->se_service, sep->se_fd);
1346 #ifdef SANITY_CHECK
1347 if (sep->se_fd < 0) {
1348 syslog(LOG_ERR,
1349 "%s: %s: bad fd", __func__, sep->se_service);
1350 exit(EX_SOFTWARE);
1351 }
1352 if (ISMUX(sep)) {
1353 syslog(LOG_ERR,
1354 "%s: %s: is mux", __func__, sep->se_service);
1355 exit(EX_SOFTWARE);
1356 }
1357 if (FD_ISSET(sep->se_fd, &allsock)) {
1358 syslog(LOG_ERR,
1359 "%s: %s: not off", __func__, sep->se_service);
1360 exit(EX_SOFTWARE);
1361 }
1362 nsock++;
1363 #endif
1364 FD_SET(sep->se_fd, &allsock);
1365 if (sep->se_fd > maxsock)
1366 maxsock = sep->se_fd;
1367 }
1368
1369 void
1370 disable(struct servtab *sep)
1371 {
1372 if (debug)
1373 warnx(
1374 "disabling %s, fd %d", sep->se_service, sep->se_fd);
1375 #ifdef SANITY_CHECK
1376 if (sep->se_fd < 0) {
1377 syslog(LOG_ERR,
1378 "%s: %s: bad fd", __func__, sep->se_service);
1379 exit(EX_SOFTWARE);
1380 }
1381 if (ISMUX(sep)) {
1382 syslog(LOG_ERR,
1383 "%s: %s: is mux", __func__, sep->se_service);
1384 exit(EX_SOFTWARE);
1385 }
1386 if (!FD_ISSET(sep->se_fd, &allsock)) {
1387 syslog(LOG_ERR,
1388 "%s: %s: not on", __func__, sep->se_service);
1389 exit(EX_SOFTWARE);
1390 }
1391 if (nsock == 0) {
1392 syslog(LOG_ERR, "%s: nsock=0", __func__);
1393 exit(EX_SOFTWARE);
1394 }
1395 nsock--;
1396 #endif
1397 FD_CLR(sep->se_fd, &allsock);
1398 if (sep->se_fd == maxsock)
1399 maxsock--;
1400 }
1401
1402 FILE *fconfig = NULL;
1403 struct servtab serv;
1404 char line[LINE_MAX];
1405
1406 int
1407 setconfig(void)
1408 {
1409
1410 if (fconfig != NULL) {
1411 fseek(fconfig, 0L, SEEK_SET);
1412 return (1);
1413 }
1414 fconfig = fopen(CONFIG, "r");
1415 return (fconfig != NULL);
1416 }
1417
1418 void
1419 endconfig(void)
1420 {
1421 if (fconfig) {
1422 fclose(fconfig);
1423 fconfig = NULL;
1424 }
1425 }
1426
1427 struct servtab *
1428 getconfigent(void)
1429 {
1430 struct servtab *sep = &serv;
1431 int argc;
1432 char *cp, *arg, *s;
1433 char *versp;
1434 static char TCPMUX_TOKEN[] = "tcpmux/";
1435 #define MUX_LEN (sizeof(TCPMUX_TOKEN)-1)
1436 int v4bind = 0;
1437 #ifdef INET6
1438 int v6bind = 0;
1439 #endif
1440 int i;
1441
1442 more:
1443 while ((cp = nextline(fconfig)) != NULL) {
1444 if (*cp == '#' || *cp == '\0')
1445 continue;
1446 break;
1447 }
1448 if (cp == NULL)
1449 return (NULL);
1450 /*
1451 * clear the static buffer, since some fields (se_ctrladdr,
1452 * for example) don't get initialized here.
1453 */
1454 memset(sep, 0, sizeof *sep);
1455 arg = skip(&cp);
1456 if (cp == NULL) {
1457 /* got an empty line containing just blanks/tabs. */
1458 goto more;
1459 }
1460 if (arg[0] == ':') { /* :user:group:perm: */
1461 char *user, *group, *perm;
1462 struct passwd *pw;
1463 struct group *gr;
1464 user = arg+1;
1465 if ((group = strchr(user, ':')) == NULL) {
1466 syslog(LOG_ERR, "no group after user '%s'", user);
1467 goto more;
1468 }
1469 *group++ = '\0';
1470 if ((perm = strchr(group, ':')) == NULL) {
1471 syslog(LOG_ERR, "no mode after group '%s'", group);
1472 goto more;
1473 }
1474 *perm++ = '\0';
1475 if ((pw = getpwnam(user)) == NULL) {
1476 syslog(LOG_ERR, "no such user '%s'", user);
1477 goto more;
1478 }
1479 sep->se_sockuid = pw->pw_uid;
1480 if ((gr = getgrnam(group)) == NULL) {
1481 syslog(LOG_ERR, "no such user '%s'", group);
1482 goto more;
1483 }
1484 sep->se_sockgid = gr->gr_gid;
1485 sep->se_sockmode = strtol(perm, &arg, 8);
1486 if (*arg != ':') {
1487 syslog(LOG_ERR, "bad mode '%s'", perm);
1488 goto more;
1489 }
1490 *arg++ = '\0';
1491 } else {
1492 sep->se_sockuid = euid;
1493 sep->se_sockgid = egid;
1494 sep->se_sockmode = 0200;
1495 }
1496 if (strncmp(arg, TCPMUX_TOKEN, MUX_LEN) == 0) {
1497 char *c = arg + MUX_LEN;
1498 if (*c == '+') {
1499 sep->se_type = MUXPLUS_TYPE;
1500 c++;
1501 } else
1502 sep->se_type = MUX_TYPE;
1503 sep->se_service = newstr(c);
1504 } else {
1505 sep->se_service = newstr(arg);
1506 sep->se_type = NORM_TYPE;
1507 }
1508 arg = sskip(&cp);
1509 if (strcmp(arg, "stream") == 0)
1510 sep->se_socktype = SOCK_STREAM;
1511 else if (strcmp(arg, "dgram") == 0)
1512 sep->se_socktype = SOCK_DGRAM;
1513 else if (strcmp(arg, "rdm") == 0)
1514 sep->se_socktype = SOCK_RDM;
1515 else if (strcmp(arg, "seqpacket") == 0)
1516 sep->se_socktype = SOCK_SEQPACKET;
1517 else if (strcmp(arg, "raw") == 0)
1518 sep->se_socktype = SOCK_RAW;
1519 else
1520 sep->se_socktype = -1;
1521
1522 arg = sskip(&cp);
1523 if (strncmp(arg, "tcp", 3) == 0) {
1524 sep->se_proto = newstr(strsep(&arg, "/"));
1525 if (arg != NULL) {
1526 if (strcmp(arg, "ttcp") == 0)
1527 sep->se_type = TTCP_TYPE;
1528 }
1529 } else {
1530 sep->se_proto = newstr(arg);
1531 }
1532 if (strncmp(sep->se_proto, "rpc/", 4) == 0) {
1533 if (no_v4bind != 0) {
1534 syslog(LOG_NOTICE, "IPv4 bind is ignored for %s",
1535 sep->se_service);
1536 freeconfig(sep);
1537 goto more;
1538 }
1539 memmove(sep->se_proto, sep->se_proto + 4,
1540 strlen(sep->se_proto) + 1 - 4);
1541 sep->se_rpc = 1;
1542 sep->se_rpc_prog = sep->se_rpc_lowvers =
1543 sep->se_rpc_highvers = 0;
1544 memcpy(&sep->se_ctrladdr4, bind_sa4,
1545 sizeof(sep->se_ctrladdr4));
1546 if ((versp = strrchr(sep->se_service, '/'))) {
1547 *versp++ = '\0';
1548 switch (sscanf(versp, "%u-%u",
1549 &sep->se_rpc_lowvers,
1550 &sep->se_rpc_highvers)) {
1551 case 2:
1552 break;
1553 case 1:
1554 sep->se_rpc_highvers =
1555 sep->se_rpc_lowvers;
1556 break;
1557 default:
1558 syslog(LOG_ERR,
1559 "bad RPC version specifier; %s",
1560 sep->se_service);
1561 freeconfig(sep);
1562 goto more;
1563 }
1564 }
1565 else {
1566 sep->se_rpc_lowvers =
1567 sep->se_rpc_highvers = 1;
1568 }
1569 }
1570 sep->se_nomapped = 0;
1571 while (isdigit(sep->se_proto[strlen(sep->se_proto) - 1])) {
1572 #ifdef INET6
1573 if (sep->se_proto[strlen(sep->se_proto) - 1] == '6') {
1574 if (no_v6bind != 0) {
1575 syslog(LOG_NOTICE, "IPv6 bind is ignored for %s",
1576 sep->se_service);
1577 freeconfig(sep);
1578 goto more;
1579 }
1580 sep->se_proto[strlen(sep->se_proto) - 1] = '\0';
1581 v6bind = 1;
1582 continue;
1583 }
1584 #endif
1585 if (sep->se_proto[strlen(sep->se_proto) - 1] == '4') {
1586 sep->se_proto[strlen(sep->se_proto) - 1] = '\0';
1587 v4bind = 1;
1588 continue;
1589 }
1590 /* illegal version num */
1591 syslog(LOG_ERR, "bad IP version for %s", sep->se_proto);
1592 freeconfig(sep);
1593 goto more;
1594 }
1595 if (strcmp(sep->se_proto, "unix") == 0) {
1596 sep->se_family = AF_UNIX;
1597 } else
1598 #ifdef INET6
1599 if (v6bind != 0) {
1600 sep->se_family = AF_INET6;
1601 if (v4bind == 0 || no_v4bind != 0)
1602 sep->se_nomapped = 1;
1603 } else
1604 #endif
1605 { /* default to v4 bind if not v6 bind */
1606 if (no_v4bind != 0) {
1607 syslog(LOG_NOTICE, "IPv4 bind is ignored for %s",
1608 sep->se_service);
1609 freeconfig(sep);
1610 goto more;
1611 }
1612 sep->se_family = AF_INET;
1613 }
1614 /* init ctladdr */
1615 switch(sep->se_family) {
1616 case AF_INET:
1617 memcpy(&sep->se_ctrladdr4, bind_sa4,
1618 sizeof(sep->se_ctrladdr4));
1619 sep->se_ctrladdr_size = sizeof(sep->se_ctrladdr4);
1620 break;
1621 #ifdef INET6
1622 case AF_INET6:
1623 memcpy(&sep->se_ctrladdr6, bind_sa6,
1624 sizeof(sep->se_ctrladdr6));
1625 sep->se_ctrladdr_size = sizeof(sep->se_ctrladdr6);
1626 break;
1627 #endif
1628 case AF_UNIX:
1629 if (strlen(sep->se_service) >= sizeof(sep->se_ctrladdr_un.sun_path)) {
1630 syslog(LOG_ERR,
1631 "domain socket pathname too long for service %s",
1632 sep->se_service);
1633 goto more;
1634 }
1635 memset(&sep->se_ctrladdr, 0, sizeof(sep->se_ctrladdr));
1636 sep->se_ctrladdr_un.sun_family = sep->se_family;
1637 sep->se_ctrladdr_un.sun_len = strlen(sep->se_service);
1638 strcpy(sep->se_ctrladdr_un.sun_path, sep->se_service);
1639 sep->se_ctrladdr_size = SUN_LEN(&sep->se_ctrladdr_un);
1640 }
1641 arg = sskip(&cp);
1642 if (!strncmp(arg, "wait", 4))
1643 sep->se_accept = 0;
1644 else if (!strncmp(arg, "nowait", 6))
1645 sep->se_accept = 1;
1646 else {
1647 syslog(LOG_ERR,
1648 "%s: bad wait/nowait for service %s",
1649 CONFIG, sep->se_service);
1650 goto more;
1651 }
1652 sep->se_maxchild = -1;
1653 sep->se_maxcpm = -1;
1654 sep->se_maxperip = -1;
1655 if ((s = strchr(arg, '/')) != NULL) {
1656 char *eptr;
1657 u_long val;
1658
1659 val = strtoul(s + 1, &eptr, 10);
1660 if (eptr == s + 1 || val > MAX_MAXCHLD) {
1661 syslog(LOG_ERR,
1662 "%s: bad max-child for service %s",
1663 CONFIG, sep->se_service);
1664 goto more;
1665 }
1666 if (debug)
1667 if (!sep->se_accept && val != 1)
1668 warnx("maxchild=%lu for wait service %s"
1669 " not recommended", val, sep->se_service);
1670 sep->se_maxchild = val;
1671 if (*eptr == '/')
1672 sep->se_maxcpm = strtol(eptr + 1, &eptr, 10);
1673 if (*eptr == '/')
1674 sep->se_maxperip = strtol(eptr + 1, &eptr, 10);
1675 /*
1676 * explicitly do not check for \0 for future expansion /
1677 * backwards compatibility
1678 */
1679 }
1680 if (ISMUX(sep)) {
1681 /*
1682 * Silently enforce "nowait" mode for TCPMUX services
1683 * since they don't have an assigned port to listen on.
1684 */
1685 sep->se_accept = 1;
1686 if (strcmp(sep->se_proto, "tcp")) {
1687 syslog(LOG_ERR,
1688 "%s: bad protocol for tcpmux service %s",
1689 CONFIG, sep->se_service);
1690 goto more;
1691 }
1692 if (sep->se_socktype != SOCK_STREAM) {
1693 syslog(LOG_ERR,
1694 "%s: bad socket type for tcpmux service %s",
1695 CONFIG, sep->se_service);
1696 goto more;
1697 }
1698 }
1699 sep->se_user = newstr(sskip(&cp));
1700 #ifdef LOGIN_CAP
1701 if ((s = strrchr(sep->se_user, '/')) != NULL) {
1702 *s = '\0';
1703 sep->se_class = newstr(s + 1);
1704 } else
1705 sep->se_class = newstr(RESOURCE_RC);
1706 #endif
1707 if ((s = strrchr(sep->se_user, ':')) != NULL) {
1708 *s = '\0';
1709 sep->se_group = newstr(s + 1);
1710 } else
1711 sep->se_group = NULL;
1712 sep->se_server = newstr(sskip(&cp));
1713 if ((sep->se_server_name = strrchr(sep->se_server, '/')))
1714 sep->se_server_name++;
1715 if (strcmp(sep->se_server, "internal") == 0) {
1716 struct biltin *bi;
1717
1718 for (bi = biltins; bi->bi_service; bi++)
1719 if (bi->bi_socktype == sep->se_socktype &&
1720 matchservent(bi->bi_service, sep->se_service,
1721 sep->se_proto))
1722 break;
1723 if (bi->bi_service == 0) {
1724 syslog(LOG_ERR, "internal service %s unknown",
1725 sep->se_service);
1726 goto more;
1727 }
1728 sep->se_accept = 1; /* force accept mode for built-ins */
1729 sep->se_bi = bi;
1730 } else
1731 sep->se_bi = NULL;
1732 if (sep->se_maxperip < 0)
1733 sep->se_maxperip = maxperip;
1734 if (sep->se_maxcpm < 0)
1735 sep->se_maxcpm = maxcpm;
1736 if (sep->se_maxchild < 0) { /* apply default max-children */
1737 if (sep->se_bi && sep->se_bi->bi_maxchild >= 0)
1738 sep->se_maxchild = sep->se_bi->bi_maxchild;
1739 else if (sep->se_accept)
1740 sep->se_maxchild = maxchild > 0 ? maxchild : 0;
1741 else
1742 sep->se_maxchild = 1;
1743 }
1744 if (sep->se_maxchild > 0) {
1745 sep->se_pids = malloc(sep->se_maxchild * sizeof(*sep->se_pids));
1746 if (sep->se_pids == NULL) {
1747 syslog(LOG_ERR, "malloc: %m");
1748 exit(EX_OSERR);
1749 }
1750 }
1751 argc = 0;
1752 for (arg = skip(&cp); cp; arg = skip(&cp))
1753 if (argc < MAXARGV) {
1754 sep->se_argv[argc++] = newstr(arg);
1755 } else {
1756 syslog(LOG_ERR,
1757 "%s: too many arguments for service %s",
1758 CONFIG, sep->se_service);
1759 goto more;
1760 }
1761 while (argc <= MAXARGV)
1762 sep->se_argv[argc++] = NULL;
1763 for (i = 0; i < PERIPSIZE; ++i)
1764 LIST_INIT(&sep->se_conn[i]);
1765 return (sep);
1766 }
1767
1768 void
1769 freeconfig(struct servtab *cp)
1770 {
1771 int i;
1772
1773 if (cp->se_service)
1774 free(cp->se_service);
1775 if (cp->se_proto)
1776 free(cp->se_proto);
1777 if (cp->se_user)
1778 free(cp->se_user);
1779 if (cp->se_group)
1780 free(cp->se_group);
1781 #ifdef LOGIN_CAP
1782 if (cp->se_class)
1783 free(cp->se_class);
1784 #endif
1785 if (cp->se_server)
1786 free(cp->se_server);
1787 if (cp->se_pids)
1788 free(cp->se_pids);
1789 for (i = 0; i < MAXARGV; i++)
1790 if (cp->se_argv[i])
1791 free(cp->se_argv[i]);
1792 free_connlist(cp);
1793 }
1794
1795
1796 /*
1797 * Safe skip - if skip returns null, log a syntax error in the
1798 * configuration file and exit.
1799 */
1800 char *
1801 sskip(char **cpp)
1802 {
1803 char *cp;
1804
1805 cp = skip(cpp);
1806 if (cp == NULL) {
1807 syslog(LOG_ERR, "%s: syntax error", CONFIG);
1808 exit(EX_DATAERR);
1809 }
1810 return (cp);
1811 }
1812
1813 char *
1814 skip(char **cpp)
1815 {
1816 char *cp = *cpp;
1817 char *start;
1818 char quote = '\0';
1819
1820 again:
1821 while (*cp == ' ' || *cp == '\t')
1822 cp++;
1823 if (*cp == '\0') {
1824 int c;
1825
1826 c = getc(fconfig);
1827 ungetc(c, fconfig);
1828 if (c == ' ' || c == '\t')
1829 if ((cp = nextline(fconfig)))
1830 goto again;
1831 *cpp = NULL;
1832 return (NULL);
1833 }
1834 if (*cp == '"' || *cp == '\'')
1835 quote = *cp++;
1836 start = cp;
1837 if (quote)
1838 while (*cp && *cp != quote)
1839 cp++;
1840 else
1841 while (*cp && *cp != ' ' && *cp != '\t')
1842 cp++;
1843 if (*cp != '\0')
1844 *cp++ = '\0';
1845 *cpp = cp;
1846 return (start);
1847 }
1848
1849 char *
1850 nextline(FILE *fd)
1851 {
1852 char *cp;
1853
1854 if (fgets(line, sizeof (line), fd) == NULL)
1855 return (NULL);
1856 cp = strchr(line, '\n');
1857 if (cp)
1858 *cp = '\0';
1859 return (line);
1860 }
1861
1862 char *
1863 newstr(const char *cp)
1864 {
1865 char *cr;
1866
1867 if ((cr = strdup(cp != NULL ? cp : "")))
1868 return (cr);
1869 syslog(LOG_ERR, "strdup: %m");
1870 exit(EX_OSERR);
1871 }
1872
1873 void
1874 inetd_setproctitle(const char *a, int s)
1875 {
1876 socklen_t size;
1877 struct sockaddr_storage ss;
1878 char buf[80], pbuf[INET6_ADDRSTRLEN];
1879
1880 size = sizeof(ss);
1881 if (getpeername(s, (struct sockaddr *)&ss, &size) == 0) {
1882 getnameinfo((struct sockaddr *)&ss, size, pbuf, sizeof(pbuf),
1883 NULL, 0, NI_NUMERICHOST|NI_WITHSCOPEID);
1884 sprintf(buf, "%s [%s]", a, pbuf);
1885 } else
1886 sprintf(buf, "%s", a);
1887 setproctitle("%s", buf);
1888 }
1889
1890 int
1891 check_loop(const struct sockaddr *sa, const struct servtab *sep)
1892 {
1893 struct servtab *se2;
1894 char pname[INET6_ADDRSTRLEN];
1895
1896 for (se2 = servtab; se2; se2 = se2->se_next) {
1897 if (!se2->se_bi || se2->se_socktype != SOCK_DGRAM)
1898 continue;
1899
1900 switch (se2->se_family) {
1901 case AF_INET:
1902 if (((const struct sockaddr_in *)sa)->sin_port ==
1903 se2->se_ctrladdr4.sin_port)
1904 goto isloop;
1905 continue;
1906 #ifdef INET6
1907 case AF_INET6:
1908 if (((const struct sockaddr_in *)sa)->sin_port ==
1909 se2->se_ctrladdr4.sin_port)
1910 goto isloop;
1911 continue;
1912 #endif
1913 default:
1914 continue;
1915 }
1916 isloop:
1917 getnameinfo(sa, sa->sa_len, pname, sizeof(pname), NULL, 0,
1918 NI_NUMERICHOST|NI_WITHSCOPEID);
1919 syslog(LOG_WARNING, "%s/%s:%s/%s loop request REFUSED from %s",
1920 sep->se_service, sep->se_proto,
1921 se2->se_service, se2->se_proto,
1922 pname);
1923 return 1;
1924 }
1925 return 0;
1926 }
1927
1928 /*
1929 * print_service:
1930 * Dump relevant information to stderr
1931 */
1932 void
1933 print_service(const char *action, const struct servtab *sep)
1934 {
1935 fprintf(stderr,
1936 "%s: %s proto=%s accept=%d max=%d user=%s group=%s"
1937 #ifdef LOGIN_CAP
1938 "class=%s"
1939 #endif
1940 " builtin=%p server=%s"
1941 "\n",
1942 action, sep->se_service, sep->se_proto,
1943 sep->se_accept, sep->se_maxchild, sep->se_user, sep->se_group,
1944 #ifdef LOGIN_CAP
1945 sep->se_class,
1946 #endif
1947 (void *) sep->se_bi, sep->se_server
1948 );
1949 }
1950
1951 #define CPMHSIZE 256
1952 #define CPMHMASK (CPMHSIZE-1)
1953 #define CHTGRAN 10
1954 #define CHTSIZE 6
1955
1956 typedef struct CTime {
1957 unsigned long ct_Ticks;
1958 int ct_Count;
1959 } CTime;
1960
1961 typedef struct CHash {
1962 union {
1963 struct in_addr c4_Addr;
1964 struct in6_addr c6_Addr;
1965 } cu_Addr;
1966 #define ch_Addr4 cu_Addr.c4_Addr
1967 #define ch_Addr6 cu_Addr.c6_Addr
1968 int ch_Family;
1969 time_t ch_LTime;
1970 char *ch_Service;
1971 CTime ch_Times[CHTSIZE];
1972 } CHash;
1973
1974 CHash CHashAry[CPMHSIZE];
1975
1976 int
1977 cpmip(const struct servtab *sep, int ctrl)
1978 {
1979 struct sockaddr_storage rss;
1980 socklen_t rssLen = sizeof(rss);
1981 int r = 0;
1982
1983 /*
1984 * If getpeername() fails, just let it through (if logging is
1985 * enabled the condition is caught elsewhere)
1986 */
1987
1988 if (sep->se_maxcpm > 0 &&
1989 getpeername(ctrl, (struct sockaddr *)&rss, &rssLen) == 0 ) {
1990 time_t t = time(NULL);
1991 int hv = 0xABC3D20F;
1992 int i;
1993 int cnt = 0;
1994 CHash *chBest = NULL;
1995 unsigned int ticks = t / CHTGRAN;
1996 struct sockaddr_in *sin4;
1997 #ifdef INET6
1998 struct sockaddr_in6 *sin6;
1999 #endif
2000
2001 sin4 = (struct sockaddr_in *)&rss;
2002 #ifdef INET6
2003 sin6 = (struct sockaddr_in6 *)&rss;
2004 #endif
2005 {
2006 char *p;
2007 int addrlen;
2008
2009 switch (rss.ss_family) {
2010 case AF_INET:
2011 p = (char *)&sin4->sin_addr;
2012 addrlen = sizeof(struct in_addr);
2013 break;
2014 #ifdef INET6
2015 case AF_INET6:
2016 p = (char *)&sin6->sin6_addr;
2017 addrlen = sizeof(struct in6_addr);
2018 break;
2019 #endif
2020 default:
2021 /* should not happen */
2022 return -1;
2023 }
2024
2025 for (i = 0; i < addrlen; ++i, ++p) {
2026 hv = (hv << 5) ^ (hv >> 23) ^ *p;
2027 }
2028 hv = (hv ^ (hv >> 16));
2029 }
2030 for (i = 0; i < 5; ++i) {
2031 CHash *ch = &CHashAry[(hv + i) & CPMHMASK];
2032
2033 if (rss.ss_family == AF_INET &&
2034 ch->ch_Family == AF_INET &&
2035 sin4->sin_addr.s_addr == ch->ch_Addr4.s_addr &&
2036 ch->ch_Service && strcmp(sep->se_service,
2037 ch->ch_Service) == 0) {
2038 chBest = ch;
2039 break;
2040 }
2041 #ifdef INET6
2042 if (rss.ss_family == AF_INET6 &&
2043 ch->ch_Family == AF_INET6 &&
2044 IN6_ARE_ADDR_EQUAL(&sin6->sin6_addr,
2045 &ch->ch_Addr6) != 0 &&
2046 ch->ch_Service && strcmp(sep->se_service,
2047 ch->ch_Service) == 0) {
2048 chBest = ch;
2049 break;
2050 }
2051 #endif
2052 if (chBest == NULL || ch->ch_LTime == 0 ||
2053 ch->ch_LTime < chBest->ch_LTime) {
2054 chBest = ch;
2055 }
2056 }
2057 if ((rss.ss_family == AF_INET &&
2058 (chBest->ch_Family != AF_INET ||
2059 sin4->sin_addr.s_addr != chBest->ch_Addr4.s_addr)) ||
2060 chBest->ch_Service == NULL ||
2061 strcmp(sep->se_service, chBest->ch_Service) != 0) {
2062 chBest->ch_Family = sin4->sin_family;
2063 chBest->ch_Addr4 = sin4->sin_addr;
2064 if (chBest->ch_Service)
2065 free(chBest->ch_Service);
2066 chBest->ch_Service = strdup(sep->se_service);
2067 bzero(chBest->ch_Times, sizeof(chBest->ch_Times));
2068 }
2069 #ifdef INET6
2070 if ((rss.ss_family == AF_INET6 &&
2071 (chBest->ch_Family != AF_INET6 ||
2072 IN6_ARE_ADDR_EQUAL(&sin6->sin6_addr,
2073 &chBest->ch_Addr6) == 0)) ||
2074 chBest->ch_Service == NULL ||
2075 strcmp(sep->se_service, chBest->ch_Service) != 0) {
2076 chBest->ch_Family = sin6->sin6_family;
2077 chBest->ch_Addr6 = sin6->sin6_addr;
2078 if (chBest->ch_Service)
2079 free(chBest->ch_Service);
2080 chBest->ch_Service = strdup(sep->se_service);
2081 bzero(chBest->ch_Times, sizeof(chBest->ch_Times));
2082 }
2083 #endif
2084 chBest->ch_LTime = t;
2085 {
2086 CTime *ct = &chBest->ch_Times[ticks % CHTSIZE];
2087 if (ct->ct_Ticks != ticks) {
2088 ct->ct_Ticks = ticks;
2089 ct->ct_Count = 0;
2090 }
2091 ++ct->ct_Count;
2092 }
2093 for (i = 0; i < CHTSIZE; ++i) {
2094 CTime *ct = &chBest->ch_Times[i];
2095 if (ct->ct_Ticks <= ticks &&
2096 ct->ct_Ticks >= ticks - CHTSIZE) {
2097 cnt += ct->ct_Count;
2098 }
2099 }
2100 if (cnt * (CHTSIZE * CHTGRAN) / 60 > sep->se_maxcpm) {
2101 char pname[INET6_ADDRSTRLEN];
2102
2103 getnameinfo((struct sockaddr *)&rss,
2104 ((struct sockaddr *)&rss)->sa_len,
2105 pname, sizeof(pname), NULL, 0,
2106 NI_NUMERICHOST|NI_WITHSCOPEID);
2107 r = -1;
2108 syslog(LOG_ERR,
2109 "%s from %s exceeded counts/min (limit %d/min)",
2110 sep->se_service, pname,
2111 sep->se_maxcpm);
2112 }
2113 }
2114 return(r);
2115 }
2116
2117 static struct conninfo *
2118 search_conn(struct servtab *sep, int ctrl)
2119 {
2120 struct sockaddr_storage ss;
2121 socklen_t sslen = sizeof(ss);
2122 struct conninfo *conn;
2123 int hv;
2124 char pname[NI_MAXHOST], pname2[NI_MAXHOST];
2125
2126 if (sep->se_maxperip <= 0)
2127 return NULL;
2128
2129 /*
2130 * If getpeername() fails, just let it through (if logging is
2131 * enabled the condition is caught elsewhere)
2132 */
2133 if (getpeername(ctrl, (struct sockaddr *)&ss, &sslen) != 0)
2134 return NULL;
2135
2136 switch (ss.ss_family) {
2137 case AF_INET:
2138 hv = hashval((char *)&((struct sockaddr_in *)&ss)->sin_addr,
2139 sizeof(struct in_addr));
2140 break;
2141 #ifdef INET6
2142 case AF_INET6:
2143 hv = hashval((char *)&((struct sockaddr_in6 *)&ss)->sin6_addr,
2144 sizeof(struct in6_addr));
2145 break;
2146 #endif
2147 default:
2148 /*
2149 * Since we only support AF_INET and AF_INET6, just
2150 * let other than AF_INET and AF_INET6 through.
2151 */
2152 return NULL;
2153 }
2154
2155 if (getnameinfo((struct sockaddr *)&ss, sslen, pname, sizeof(pname),
2156 NULL, 0, NI_NUMERICHOST | NI_WITHSCOPEID) != 0)
2157 return NULL;
2158
2159 LIST_FOREACH(conn, &sep->se_conn[hv], co_link) {
2160 if (getnameinfo((struct sockaddr *)&conn->co_addr,
2161 conn->co_addr.ss_len, pname2, sizeof(pname2), NULL, 0,
2162 NI_NUMERICHOST | NI_WITHSCOPEID) == 0 &&
2163 strcmp(pname, pname2) == 0)
2164 break;
2165 }
2166
2167 if (conn == NULL) {
2168 if ((conn = malloc(sizeof(struct conninfo))) == NULL) {
2169 syslog(LOG_ERR, "malloc: %m");
2170 exit(EX_OSERR);
2171 }
2172 conn->co_proc = malloc(sep->se_maxperip * sizeof(*conn->co_proc));
2173 if (conn->co_proc == NULL) {
2174 syslog(LOG_ERR, "malloc: %m");
2175 exit(EX_OSERR);
2176 }
2177 memcpy(&conn->co_addr, (struct sockaddr *)&ss, sslen);
2178 conn->co_numchild = 0;
2179 LIST_INSERT_HEAD(&sep->se_conn[hv], conn, co_link);
2180 }
2181
2182 /*
2183 * Since a child process is not invoked yet, we cannot
2184 * determine a pid of a child. So, co_proc and co_numchild
2185 * should be filled leter.
2186 */
2187
2188 return conn;
2189 }
2190
2191 static int
2192 room_conn(struct servtab *sep, struct conninfo *conn)
2193 {
2194 char pname[NI_MAXHOST];
2195
2196 if (conn->co_numchild >= sep->se_maxperip) {
2197 getnameinfo((struct sockaddr *)&conn->co_addr,
2198 conn->co_addr.ss_len, pname, sizeof(pname), NULL, 0,
2199 NI_NUMERICHOST | NI_WITHSCOPEID);
2200 syslog(LOG_ERR, "%s from %s exceeded counts (limit %d)",
2201 sep->se_service, pname, sep->se_maxperip);
2202 return 0;
2203 }
2204 return 1;
2205 }
2206
2207 static void
2208 addchild_conn(struct conninfo *conn, pid_t pid)
2209 {
2210 struct procinfo *proc;
2211
2212 if (conn == NULL)
2213 return;
2214
2215 if ((proc = search_proc(pid, 1)) != NULL) {
2216 if (proc->pr_conn != NULL) {
2217 syslog(LOG_ERR,
2218 "addchild_conn: child already on process list");
2219 exit(EX_OSERR);
2220 }
2221 proc->pr_conn = conn;
2222 }
2223
2224 conn->co_proc[conn->co_numchild++] = proc;
2225 }
2226
2227 static void
2228 reapchild_conn(pid_t pid)
2229 {
2230 struct procinfo *proc;
2231 struct conninfo *conn;
2232 int i;
2233
2234 if ((proc = search_proc(pid, 0)) == NULL)
2235 return;
2236 if ((conn = proc->pr_conn) == NULL)
2237 return;
2238 for (i = 0; i < conn->co_numchild; ++i)
2239 if (conn->co_proc[i] == proc) {
2240 conn->co_proc[i] = conn->co_proc[--conn->co_numchild];
2241 break;
2242 }
2243 free_proc(proc);
2244 free_conn(conn);
2245 }
2246
2247 static void
2248 resize_conn(struct servtab *sep, int maxpip)
2249 {
2250 struct conninfo *conn;
2251 int i, j;
2252
2253 if (sep->se_maxperip <= 0)
2254 return;
2255 if (maxpip <= 0) {
2256 free_connlist(sep);
2257 return;
2258 }
2259 for (i = 0; i < PERIPSIZE; ++i) {
2260 LIST_FOREACH(conn, &sep->se_conn[i], co_link) {
2261 for (j = maxpip; j < conn->co_numchild; ++j)
2262 free_proc(conn->co_proc[j]);
2263 conn->co_proc = realloc(conn->co_proc,
2264 maxpip * sizeof(*conn->co_proc));
2265 if (conn->co_proc == NULL) {
2266 syslog(LOG_ERR, "realloc: %m");
2267 exit(EX_OSERR);
2268 }
2269 if (conn->co_numchild > maxpip)
2270 conn->co_numchild = maxpip;
2271 }
2272 }
2273 }
2274
2275 static void
2276 free_connlist(struct servtab *sep)
2277 {
2278 struct conninfo *conn;
2279 int i, j;
2280
2281 for (i = 0; i < PERIPSIZE; ++i) {
2282 while ((conn = LIST_FIRST(&sep->se_conn[i])) != NULL) {
2283 for (j = 0; j < conn->co_numchild; ++j)
2284 free_proc(conn->co_proc[j]);
2285 conn->co_numchild = 0;
2286 free_conn(conn);
2287 }
2288 }
2289 }
2290
2291 static void
2292 free_conn(struct conninfo *conn)
2293 {
2294 if (conn == NULL)
2295 return;
2296 if (conn->co_numchild <= 0) {
2297 LIST_REMOVE(conn, co_link);
2298 free(conn->co_proc);
2299 free(conn);
2300 }
2301 }
2302
2303 static struct procinfo *
2304 search_proc(pid_t pid, int add)
2305 {
2306 struct procinfo *proc;
2307 int hv;
2308
2309 hv = hashval((char *)&pid, sizeof(pid));
2310 LIST_FOREACH(proc, &proctable[hv], pr_link) {
2311 if (proc->pr_pid == pid)
2312 break;
2313 }
2314 if (proc == NULL && add) {
2315 if ((proc = malloc(sizeof(struct procinfo))) == NULL) {
2316 syslog(LOG_ERR, "malloc: %m");
2317 exit(EX_OSERR);
2318 }
2319 proc->pr_pid = pid;
2320 proc->pr_conn = NULL;
2321 LIST_INSERT_HEAD(&proctable[hv], proc, pr_link);
2322 }
2323 return proc;
2324 }
2325
2326 static void
2327 free_proc(struct procinfo *proc)
2328 {
2329 if (proc == NULL)
2330 return;
2331 LIST_REMOVE(proc, pr_link);
2332 free(proc);
2333 }
2334
2335 static int
2336 hashval(char *p, int len)
2337 {
2338 int i, hv = 0xABC3D20F;
2339
2340 for (i = 0; i < len; ++i, ++p)
2341 hv = (hv << 5) ^ (hv >> 23) ^ *p;
2342 hv = (hv ^ (hv >> 16)) & (PERIPSIZE - 1);
2343 return hv;
2344 }
DragonFly BSD