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
getvalue(const char * arg,int * value,const char * whine)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
whichaf(struct request_info * req)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
main(int argc,char ** argv)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 (pipe2(signalpipe, O_CLOEXEC) != 0) {
492 syslog(LOG_ERR, "pipe2 (O_CLOEXEC): %m");
493 exit(EX_OSERR);
494 }
495 FD_SET(signalpipe[0], &allsock);
496 #ifdef SANITY_CHECK
497 nsock++;
498 #endif
499 if (signalpipe[0] > maxsock)
500 maxsock = signalpipe[0];
501 if (signalpipe[1] > maxsock)
502 maxsock = signalpipe[1];
503
504 for (;;) {
505 int n, ctrl;
506 fd_set readable;
507
508 #ifdef SANITY_CHECK
509 if (nsock == 0) {
510 syslog(LOG_ERR, "%s: nsock=0", __func__);
511 exit(EX_SOFTWARE);
512 }
513 #endif
514 readable = allsock;
515 if ((n = select(maxsock + 1, &readable, NULL, NULL, NULL)) <= 0) {
516 if (n < 0 && errno != EINTR) {
517 syslog(LOG_WARNING, "select: %m");
518 sleep(1);
519 }
520 continue;
521 }
522 /* handle any queued signal flags */
523 if (FD_ISSET(signalpipe[0], &readable)) {
524 int nsig;
525 if (ioctl(signalpipe[0], FIONREAD, &nsig) != 0) {
526 syslog(LOG_ERR, "ioctl: %m");
527 exit(EX_OSERR);
528 }
529 while (--nsig >= 0) {
530 char c;
531 if (read(signalpipe[0], &c, 1) != 1) {
532 syslog(LOG_ERR, "read: %m");
533 exit(EX_OSERR);
534 }
535 if (debug)
536 warnx("handling signal flag %c", c);
537 switch(c) {
538 case 'A': /* sigalrm */
539 retry();
540 break;
541 case 'C': /* sigchld */
542 reapchild();
543 break;
544 case 'H': /* sighup */
545 config();
546 break;
547 }
548 }
549 }
550 for (sep = servtab; n && sep; sep = sep->se_next)
551 if (sep->se_fd != -1 && FD_ISSET(sep->se_fd, &readable)) {
552 n--;
553 if (debug)
554 warnx("someone wants %s", sep->se_service);
555 dofork = !sep->se_bi || sep->se_bi->bi_fork || ISWRAP(sep);
556 conn = NULL;
557 if (sep->se_accept && sep->se_socktype == SOCK_STREAM) {
558 i = 1;
559 if (ioctl(sep->se_fd, FIONBIO, &i) < 0)
560 syslog(LOG_ERR, "ioctl (FIONBIO, 1): %m");
561 ctrl = accept(sep->se_fd, NULL, NULL);
562 if (debug)
563 warnx("accept, ctrl %d", ctrl);
564 if (ctrl < 0) {
565 if (errno != EINTR)
566 syslog(LOG_WARNING,
567 "accept (for %s): %m",
568 sep->se_service);
569 if (sep->se_accept &&
570 sep->se_socktype == SOCK_STREAM)
571 close(ctrl);
572 continue;
573 }
574 i = 0;
575 if (ioctl(sep->se_fd, FIONBIO, &i) < 0)
576 syslog(LOG_ERR, "ioctl1(FIONBIO, 0): %m");
577 if (ioctl(ctrl, FIONBIO, &i) < 0)
578 syslog(LOG_ERR, "ioctl2(FIONBIO, 0): %m");
579 if (cpmip(sep, ctrl) < 0) {
580 close(ctrl);
581 continue;
582 }
583 if (dofork &&
584 (conn = search_conn(sep, ctrl)) != NULL &&
585 !room_conn(sep, conn)) {
586 close(ctrl);
587 continue;
588 }
589 } else
590 ctrl = sep->se_fd;
591 if (dolog && !ISWRAP(sep)) {
592 char pname[INET6_ADDRSTRLEN] = "unknown";
593 socklen_t sl;
594 sl = sizeof peermax;
595 if (getpeername(ctrl, (struct sockaddr *)
596 &peermax, &sl)) {
597 sl = sizeof peermax;
598 if (recvfrom(ctrl, buf, sizeof(buf),
599 MSG_PEEK,
600 (struct sockaddr *)&peermax,
601 &sl) >= 0) {
602 getnameinfo((struct sockaddr *)&peermax,
603 peer.sa_len,
604 pname, sizeof(pname),
605 NULL, 0,
606 NI_NUMERICHOST|
607 NI_WITHSCOPEID);
608 }
609 } else {
610 getnameinfo((struct sockaddr *)&peermax,
611 peer.sa_len,
612 pname, sizeof(pname),
613 NULL, 0,
614 NI_NUMERICHOST|
615 NI_WITHSCOPEID);
616 }
617 syslog(LOG_INFO,"%s from %s", sep->se_service, pname);
618 }
619 sigblock(SIGBLOCK);
620 pid = 0;
621 /*
622 * Fork for all external services, builtins which need to
623 * fork and anything we're wrapping (as wrapping might
624 * block or use hosts_options(5) twist).
625 */
626 if (dofork) {
627 if (sep->se_count++ == 0)
628 gettimeofday(&sep->se_time, NULL);
629 else if (toomany > 0 && sep->se_count >= toomany) {
630 struct timeval now;
631
632 gettimeofday(&now, NULL);
633 if (now.tv_sec - sep->se_time.tv_sec >
634 CNT_INTVL) {
635 sep->se_time = now;
636 sep->se_count = 1;
637 } else {
638 syslog(LOG_ERR,
639 "%s/%s server failing (looping), service terminated",
640 sep->se_service, sep->se_proto);
641 if (sep->se_accept &&
642 sep->se_socktype == SOCK_STREAM)
643 close(ctrl);
644 close_sep(sep);
645 free_conn(conn);
646 sigsetmask(0L);
647 if (!timingout) {
648 timingout = 1;
649 alarm(RETRYTIME);
650 }
651 continue;
652 }
653 }
654 pid = fork();
655 }
656 if (pid < 0) {
657 syslog(LOG_ERR, "fork: %m");
658 if (sep->se_accept &&
659 sep->se_socktype == SOCK_STREAM)
660 close(ctrl);
661 free_conn(conn);
662 sigsetmask(0L);
663 sleep(1);
664 continue;
665 }
666 if (pid) {
667 addchild_conn(conn, pid);
668 addchild(sep, pid);
669 }
670 sigsetmask(0L);
671 if (pid == 0) {
672 if (dofork) {
673 sigaction(SIGALRM, &saalrm, NULL);
674 sigaction(SIGCHLD, &sachld, NULL);
675 sigaction(SIGHUP, &sahup, NULL);
676 /* SIGPIPE reset before exec */
677 }
678 /*
679 * Call tcpmux to find the real service to exec.
680 */
681 if (sep->se_bi &&
682 sep->se_bi->bi_fn == (bi_fn_t *) tcpmux) {
683 sep = tcpmux(ctrl);
684 if (sep == NULL) {
685 close(ctrl);
686 _exit(0);
687 }
688 }
689 if (ISWRAP(sep)) {
690 inetd_setproctitle("wrapping", ctrl);
691 service = sep->se_server_name ?
692 sep->se_server_name : sep->se_service;
693 request_init(&req, RQ_DAEMON, service, RQ_FILE, ctrl, NULL);
694 fromhost(&req);
695 deny_severity = LIBWRAP_DENY_FACILITY|LIBWRAP_DENY_SEVERITY;
696 allow_severity = LIBWRAP_ALLOW_FACILITY|LIBWRAP_ALLOW_SEVERITY;
697 denied = !hosts_access(&req);
698 if (denied) {
699 syslog(deny_severity,
700 "refused connection from %.500s, service %s (%s%s)",
701 eval_client(&req), service, sep->se_proto,
702 (whichaf(&req) == AF_INET6) ? "6" : "");
703 if (sep->se_socktype != SOCK_STREAM)
704 recv(ctrl, buf, sizeof (buf), 0);
705 if (dofork) {
706 sleep(1);
707 _exit(0);
708 }
709 }
710 if (dolog) {
711 syslog(allow_severity,
712 "connection from %.500s, service %s (%s%s)",
713 eval_client(&req), service, sep->se_proto,
714 (whichaf(&req) == AF_INET6) ? "6" : "");
715 }
716 }
717 if (sep->se_bi) {
718 (*sep->se_bi->bi_fn)(ctrl, sep);
719 } else {
720 if (debug)
721 warnx("%d execl %s",
722 getpid(), sep->se_server);
723 /* Clear close-on-exec. */
724 if (fcntl(ctrl, F_SETFD, 0) < 0) {
725 syslog(LOG_ERR,
726 "%s/%s: fcntl (F_SETFD, 0): %m",
727 sep->se_service, sep->se_proto);
728 _exit(EX_OSERR);
729 }
730 if (ctrl != 0) {
731 dup2(ctrl, 0);
732 close(ctrl);
733 }
734 dup2(0, 1);
735 dup2(0, 2);
736 if ((pwd = getpwnam(sep->se_user)) == NULL) {
737 syslog(LOG_ERR,
738 "%s/%s: %s: no such user",
739 sep->se_service, sep->se_proto,
740 sep->se_user);
741 if (sep->se_socktype != SOCK_STREAM)
742 recv(0, buf, sizeof (buf), 0);
743 _exit(EX_NOUSER);
744 }
745 grp = NULL;
746 if ( sep->se_group != NULL
747 && (grp = getgrnam(sep->se_group)) == NULL
748 ) {
749 syslog(LOG_ERR,
750 "%s/%s: %s: no such group",
751 sep->se_service, sep->se_proto,
752 sep->se_group);
753 if (sep->se_socktype != SOCK_STREAM)
754 recv(0, buf, sizeof (buf), 0);
755 _exit(EX_NOUSER);
756 }
757 if (grp != NULL)
758 pwd->pw_gid = grp->gr_gid;
759 #ifdef LOGIN_CAP
760 if ((lc = login_getclass(sep->se_class)) == NULL) {
761 /* error syslogged by getclass */
762 syslog(LOG_ERR,
763 "%s/%s: %s: login class error",
764 sep->se_service, sep->se_proto,
765 sep->se_class);
766 if (sep->se_socktype != SOCK_STREAM)
767 recv(0, buf, sizeof (buf), 0);
768 _exit(EX_NOUSER);
769 }
770 #endif
771 if (setsid() < 0) {
772 syslog(LOG_ERR,
773 "%s: can't setsid(): %m",
774 sep->se_service);
775 /* _exit(EX_OSERR); not fatal yet */
776 }
777 #ifdef LOGIN_CAP
778 if (setusercontext(lc, pwd, pwd->pw_uid,
779 LOGIN_SETALL) != 0) {
780 syslog(LOG_ERR,
781 "%s: can't setusercontext(..%s..): %m",
782 sep->se_service, sep->se_user);
783 _exit(EX_OSERR);
784 }
785 login_close(lc);
786 #else
787 if (pwd->pw_uid) {
788 if (setlogin(sep->se_user) < 0) {
789 syslog(LOG_ERR,
790 "%s: can't setlogin(%s): %m",
791 sep->se_service, sep->se_user);
792 /* _exit(EX_OSERR); not yet */
793 }
794 if (setgid(pwd->pw_gid) < 0) {
795 syslog(LOG_ERR,
796 "%s: can't set gid %d: %m",
797 sep->se_service, pwd->pw_gid);
798 _exit(EX_OSERR);
799 }
800 initgroups(pwd->pw_name,
801 pwd->pw_gid);
802 if (setuid(pwd->pw_uid) < 0) {
803 syslog(LOG_ERR,
804 "%s: can't set uid %d: %m",
805 sep->se_service, pwd->pw_uid);
806 _exit(EX_OSERR);
807 }
808 }
809 #endif
810 sigaction(SIGPIPE, &sapipe, NULL);
811 execv(sep->se_server, sep->se_argv);
812 syslog(LOG_ERR,
813 "cannot execute %s: %m", sep->se_server);
814 if (sep->se_socktype != SOCK_STREAM)
815 recv(0, buf, sizeof (buf), 0);
816 }
817 if (dofork)
818 _exit(0);
819 }
820 if (sep->se_accept && sep->se_socktype == SOCK_STREAM)
821 close(ctrl);
822 }
823 }
824 }
825
826 /*
827 * Add a signal flag to the signal flag queue for later handling
828 */
829
830 void
flag_signal(int c)831 flag_signal(int c)
832 {
833 char ch = c;
834
835 if (write(signalpipe[1], &ch, 1) != 1) {
836 syslog(LOG_ERR, "write: %m");
837 _exit(EX_OSERR);
838 }
839 }
840
841 /*
842 * Record a new child pid for this service. If we've reached the
843 * limit on children, then stop accepting incoming requests.
844 */
845
846 void
addchild(struct servtab * sep,pid_t pid)847 addchild(struct servtab *sep, pid_t pid)
848 {
849 if (sep->se_maxchild <= 0)
850 return;
851 #ifdef SANITY_CHECK
852 if (sep->se_numchild >= sep->se_maxchild) {
853 syslog(LOG_ERR, "%s: %d >= %d",
854 __func__, sep->se_numchild, sep->se_maxchild);
855 exit(EX_SOFTWARE);
856 }
857 #endif
858 sep->se_pids[sep->se_numchild++] = pid;
859 if (sep->se_numchild == sep->se_maxchild)
860 disable(sep);
861 }
862
863 /*
864 * Some child process has exited. See if it's on somebody's list.
865 */
866
867 void
flag_reapchild(int signo __unused)868 flag_reapchild(int signo __unused)
869 {
870 flag_signal('C');
871 }
872
873 void
reapchild(void)874 reapchild(void)
875 {
876 int k, status;
877 pid_t pid;
878 struct servtab *sep;
879
880 for (;;) {
881 pid = wait3(&status, WNOHANG, NULL);
882 if (pid <= 0)
883 break;
884 if (debug)
885 warnx("%d reaped, %s %u", pid,
886 WIFEXITED(status) ? "status" : "signal",
887 WIFEXITED(status) ? WEXITSTATUS(status)
888 : WTERMSIG(status));
889 for (sep = servtab; sep; sep = sep->se_next) {
890 for (k = 0; k < sep->se_numchild; k++)
891 if (sep->se_pids[k] == pid)
892 break;
893 if (k == sep->se_numchild)
894 continue;
895 if (sep->se_numchild == sep->se_maxchild)
896 enable(sep);
897 sep->se_pids[k] = sep->se_pids[--sep->se_numchild];
898 if (WIFSIGNALED(status) || WEXITSTATUS(status))
899 syslog(LOG_WARNING,
900 "%s[%d]: exited, %s %u",
901 sep->se_server, pid,
902 WIFEXITED(status) ? "status" : "signal",
903 WIFEXITED(status) ? WEXITSTATUS(status)
904 : WTERMSIG(status));
905 break;
906 }
907 reapchild_conn(pid);
908 }
909 }
910
911 void
flag_config(int signo __unused)912 flag_config(int signo __unused)
913 {
914 flag_signal('H');
915 }
916
917 void
config(void)918 config(void)
919 {
920 struct servtab *sep, *new, **sepp;
921 long omask;
922 #ifdef LOGIN_CAP
923 login_cap_t *lc = NULL;
924 #endif
925
926
927 if (!setconfig()) {
928 syslog(LOG_ERR, "%s: %m", CONFIG);
929 return;
930 }
931 for (sep = servtab; sep; sep = sep->se_next)
932 sep->se_checked = 0;
933 while ((new = getconfigent())) {
934 if (getpwnam(new->se_user) == NULL) {
935 syslog(LOG_ERR,
936 "%s/%s: no such user '%s', service ignored",
937 new->se_service, new->se_proto, new->se_user);
938 continue;
939 }
940 if (new->se_group && getgrnam(new->se_group) == NULL) {
941 syslog(LOG_ERR,
942 "%s/%s: no such group '%s', service ignored",
943 new->se_service, new->se_proto, new->se_group);
944 continue;
945 }
946 #ifdef LOGIN_CAP
947 if ((lc = login_getclass(new->se_class)) == NULL) {
948 /* error syslogged by getclass */
949 syslog(LOG_ERR,
950 "%s/%s: %s: login class error, service ignored",
951 new->se_service, new->se_proto, new->se_class);
952 continue;
953 }
954 login_close(lc);
955 #endif
956 for (sep = servtab; sep; sep = sep->se_next)
957 if (strcmp(sep->se_service, new->se_service) == 0 &&
958 strcmp(sep->se_proto, new->se_proto) == 0 &&
959 sep->se_socktype == new->se_socktype &&
960 sep->se_family == new->se_family)
961 break;
962 if (sep != NULL) {
963 int i;
964
965 #define SWAP(a, b) { typeof(a) c = a; a = b; b = c; }
966 omask = sigblock(SIGBLOCK);
967 if (sep->se_nomapped != new->se_nomapped) {
968 sep->se_nomapped = new->se_nomapped;
969 sep->se_reset = 1;
970 }
971 /* copy over outstanding child pids */
972 if (sep->se_maxchild > 0 && new->se_maxchild > 0) {
973 new->se_numchild = sep->se_numchild;
974 if (new->se_numchild > new->se_maxchild)
975 new->se_numchild = new->se_maxchild;
976 memcpy(new->se_pids, sep->se_pids,
977 new->se_numchild * sizeof(*new->se_pids));
978 }
979 SWAP(sep->se_pids, new->se_pids);
980 sep->se_maxchild = new->se_maxchild;
981 sep->se_numchild = new->se_numchild;
982 sep->se_maxcpm = new->se_maxcpm;
983 resize_conn(sep, new->se_maxperip);
984 sep->se_maxperip = new->se_maxperip;
985 sep->se_bi = new->se_bi;
986 /* might need to turn on or off service now */
987 if (sep->se_fd >= 0) {
988 if (sep->se_maxchild > 0
989 && sep->se_numchild == sep->se_maxchild) {
990 if (FD_ISSET(sep->se_fd, &allsock))
991 disable(sep);
992 } else {
993 if (!FD_ISSET(sep->se_fd, &allsock))
994 enable(sep);
995 }
996 }
997 sep->se_accept = new->se_accept;
998 SWAP(sep->se_user, new->se_user);
999 SWAP(sep->se_group, new->se_group);
1000 #ifdef LOGIN_CAP
1001 SWAP(sep->se_class, new->se_class);
1002 #endif
1003 SWAP(sep->se_server, new->se_server);
1004 SWAP(sep->se_server_name, new->se_server_name);
1005 for (i = 0; i < MAXARGV; i++)
1006 SWAP(sep->se_argv[i], new->se_argv[i]);
1007 sigsetmask(omask);
1008 freeconfig(new);
1009 if (debug)
1010 print_service("REDO", sep);
1011 } else {
1012 sep = enter(new);
1013 if (debug)
1014 print_service("ADD ", sep);
1015 }
1016 sep->se_checked = 1;
1017 if (ISMUX(sep)) {
1018 sep->se_fd = -1;
1019 continue;
1020 }
1021 switch (sep->se_family) {
1022 case AF_INET:
1023 if (no_v4bind != 0) {
1024 sep->se_fd = -1;
1025 continue;
1026 }
1027 break;
1028 #ifdef INET6
1029 case AF_INET6:
1030 if (no_v6bind != 0) {
1031 sep->se_fd = -1;
1032 continue;
1033 }
1034 break;
1035 #endif
1036 }
1037 if (!sep->se_rpc) {
1038 if (sep->se_family != AF_UNIX) {
1039 sp = getservbyname(sep->se_service, sep->se_proto);
1040 if (sp == NULL) {
1041 syslog(LOG_ERR, "%s/%s: unknown service",
1042 sep->se_service, sep->se_proto);
1043 sep->se_checked = 0;
1044 continue;
1045 }
1046 }
1047 switch (sep->se_family) {
1048 case AF_INET:
1049 if (sp->s_port != sep->se_ctrladdr4.sin_port) {
1050 sep->se_ctrladdr4.sin_port =
1051 sp->s_port;
1052 sep->se_reset = 1;
1053 }
1054 break;
1055 #ifdef INET6
1056 case AF_INET6:
1057 if (sp->s_port !=
1058 sep->se_ctrladdr6.sin6_port) {
1059 sep->se_ctrladdr6.sin6_port =
1060 sp->s_port;
1061 sep->se_reset = 1;
1062 }
1063 break;
1064 #endif
1065 }
1066 if (sep->se_reset != 0 && sep->se_fd >= 0)
1067 close_sep(sep);
1068 } else {
1069 rpc = getrpcbyname(sep->se_service);
1070 if (rpc == NULL) {
1071 syslog(LOG_ERR, "%s/%s unknown RPC service",
1072 sep->se_service, sep->se_proto);
1073 if (sep->se_fd != -1)
1074 close(sep->se_fd);
1075 sep->se_fd = -1;
1076 continue;
1077 }
1078 if (rpc->r_number != sep->se_rpc_prog) {
1079 if (sep->se_rpc_prog)
1080 unregisterrpc(sep);
1081 sep->se_rpc_prog = rpc->r_number;
1082 if (sep->se_fd != -1)
1083 close(sep->se_fd);
1084 sep->se_fd = -1;
1085 }
1086 }
1087 if (sep->se_fd == -1)
1088 setup(sep);
1089 }
1090 endconfig();
1091 /*
1092 * Purge anything not looked at above.
1093 */
1094 omask = sigblock(SIGBLOCK);
1095 sepp = &servtab;
1096 while ((sep = *sepp)) {
1097 if (sep->se_checked) {
1098 sepp = &sep->se_next;
1099 continue;
1100 }
1101 *sepp = sep->se_next;
1102 if (sep->se_fd >= 0)
1103 close_sep(sep);
1104 if (debug)
1105 print_service("FREE", sep);
1106 if (sep->se_rpc && sep->se_rpc_prog > 0)
1107 unregisterrpc(sep);
1108 freeconfig(sep);
1109 free(sep);
1110 }
1111 sigsetmask(omask);
1112 }
1113
1114 void
unregisterrpc(struct servtab * sep)1115 unregisterrpc(struct servtab *sep)
1116 {
1117 u_int i;
1118 struct servtab *sepp;
1119 long omask;
1120
1121 omask = sigblock(SIGBLOCK);
1122 for (sepp = servtab; sepp; sepp = sepp->se_next) {
1123 if (sepp == sep)
1124 continue;
1125 if (sep->se_checked == 0 ||
1126 !sepp->se_rpc ||
1127 sep->se_rpc_prog != sepp->se_rpc_prog)
1128 continue;
1129 return;
1130 }
1131 if (debug)
1132 print_service("UNREG", sep);
1133 for (i = sep->se_rpc_lowvers; i <= sep->se_rpc_highvers; i++)
1134 pmap_unset(sep->se_rpc_prog, i);
1135 if (sep->se_fd != -1)
1136 close(sep->se_fd);
1137 sep->se_fd = -1;
1138 sigsetmask(omask);
1139 }
1140
1141 void
flag_retry(int signo __unused)1142 flag_retry(int signo __unused)
1143 {
1144 flag_signal('A');
1145 }
1146
1147 void
retry(void)1148 retry(void)
1149 {
1150 struct servtab *sep;
1151
1152 timingout = 0;
1153 for (sep = servtab; sep; sep = sep->se_next)
1154 if (sep->se_fd == -1 && !ISMUX(sep))
1155 setup(sep);
1156 }
1157
1158 void
setup(struct servtab * sep)1159 setup(struct servtab *sep)
1160 {
1161 int on = 1;
1162
1163 if ((sep->se_fd = socket(sep->se_family, sep->se_socktype, 0)) < 0) {
1164 if (debug)
1165 warn("socket failed on %s/%s",
1166 sep->se_service, sep->se_proto);
1167 syslog(LOG_ERR, "%s/%s: socket: %m",
1168 sep->se_service, sep->se_proto);
1169 return;
1170 }
1171 /* Set all listening sockets to close-on-exec. */
1172 if (fcntl(sep->se_fd, F_SETFD, FD_CLOEXEC) < 0) {
1173 syslog(LOG_ERR, "%s/%s: fcntl (F_SETFD, FD_CLOEXEC): %m",
1174 sep->se_service, sep->se_proto);
1175 close(sep->se_fd);
1176 return;
1177 }
1178 #define turnon(fd, opt) \
1179 setsockopt(fd, SOL_SOCKET, opt, (char *)&on, sizeof (on))
1180 if (strcmp(sep->se_proto, "tcp") == 0 && (options & SO_DEBUG) &&
1181 turnon(sep->se_fd, SO_DEBUG) < 0)
1182 syslog(LOG_ERR, "setsockopt (SO_DEBUG): %m");
1183 if (turnon(sep->se_fd, SO_REUSEADDR) < 0)
1184 syslog(LOG_ERR, "setsockopt (SO_REUSEADDR): %m");
1185 #ifdef SO_PRIVSTATE
1186 if (turnon(sep->se_fd, SO_PRIVSTATE) < 0)
1187 syslog(LOG_ERR, "setsockopt (SO_PRIVSTATE): %m");
1188 #endif
1189 /* tftpd opens a new connection then needs more infos */
1190 if ((sep->se_family == AF_INET6) &&
1191 (strcmp(sep->se_proto, "udp") == 0) &&
1192 (sep->se_accept == 0) &&
1193 (setsockopt(sep->se_fd, IPPROTO_IPV6, IPV6_PKTINFO,
1194 (char *)&on, sizeof (on)) < 0))
1195 syslog(LOG_ERR, "setsockopt (IPV6_RECVPKTINFO): %m");
1196 if (sep->se_family == AF_INET6) {
1197 int flag = sep->se_nomapped ? 1 : 0;
1198 if (setsockopt(sep->se_fd, IPPROTO_IPV6, IPV6_V6ONLY,
1199 (char *)&flag, sizeof (flag)) < 0)
1200 syslog(LOG_ERR, "setsockopt (IPV6_V6ONLY): %m");
1201 }
1202 #undef turnon
1203 if (sep->se_type == TTCP_TYPE)
1204 if (setsockopt(sep->se_fd, IPPROTO_TCP, TCP_NOPUSH,
1205 (char *)&on, sizeof (on)) < 0)
1206 syslog(LOG_ERR, "setsockopt (TCP_NOPUSH): %m");
1207 if (sep->se_family == AF_UNIX) {
1208 unlink(sep->se_ctrladdr_un.sun_path);
1209 umask(0777); /* Make socket with conservative permissions */
1210 }
1211 if (bind(sep->se_fd, (struct sockaddr *)&sep->se_ctrladdr,
1212 sep->se_ctrladdr_size) < 0) {
1213 if (debug)
1214 warn("bind failed on %s/%s",
1215 sep->se_service, sep->se_proto);
1216 syslog(LOG_ERR, "%s/%s: bind: %m",
1217 sep->se_service, sep->se_proto);
1218 close(sep->se_fd);
1219 sep->se_fd = -1;
1220 if (!timingout) {
1221 timingout = 1;
1222 alarm(RETRYTIME);
1223 }
1224 if (sep->se_family == AF_UNIX)
1225 umask(mask);
1226 return;
1227 }
1228 if (sep->se_family == AF_UNIX) {
1229 /* Ick - fch{own,mod} don't work on Unix domain sockets */
1230 if (chown(sep->se_service, sep->se_sockuid, sep->se_sockgid) < 0)
1231 syslog(LOG_ERR, "chown socket: %m");
1232 if (chmod(sep->se_service, sep->se_sockmode) < 0)
1233 syslog(LOG_ERR, "chmod socket: %m");
1234 umask(mask);
1235 }
1236 if (sep->se_rpc) {
1237 u_int i;
1238 socklen_t len = sep->se_ctrladdr_size;
1239
1240 if (sep->se_family != AF_INET) {
1241 syslog(LOG_ERR,
1242 "%s/%s: unsupported address family for rpc",
1243 sep->se_service, sep->se_proto);
1244 close(sep->se_fd);
1245 sep->se_fd = -1;
1246 return;
1247 }
1248 if (getsockname(sep->se_fd,
1249 (struct sockaddr*)&sep->se_ctrladdr, &len) < 0){
1250 syslog(LOG_ERR, "%s/%s: getsockname: %m",
1251 sep->se_service, sep->se_proto);
1252 close(sep->se_fd);
1253 sep->se_fd = -1;
1254 return;
1255 }
1256 if (debug)
1257 print_service("REG ", sep);
1258 for (i = sep->se_rpc_lowvers; i <= sep->se_rpc_highvers; i++) {
1259 pmap_unset(sep->se_rpc_prog, i);
1260 pmap_set(sep->se_rpc_prog, i,
1261 (sep->se_socktype == SOCK_DGRAM)
1262 ? IPPROTO_UDP : IPPROTO_TCP,
1263 ntohs(sep->se_ctrladdr4.sin_port));
1264 }
1265 }
1266 if (sep->se_socktype == SOCK_STREAM)
1267 listen(sep->se_fd, 64);
1268 enable(sep);
1269 if (debug) {
1270 warnx("registered %s on %d",
1271 sep->se_server, sep->se_fd);
1272 }
1273 }
1274
1275 /*
1276 * Finish with a service and its socket.
1277 */
1278 void
close_sep(struct servtab * sep)1279 close_sep(struct servtab *sep)
1280 {
1281 if (sep->se_fd >= 0) {
1282 if (FD_ISSET(sep->se_fd, &allsock))
1283 disable(sep);
1284 close(sep->se_fd);
1285 sep->se_fd = -1;
1286 }
1287 sep->se_count = 0;
1288 sep->se_numchild = 0; /* forget about any existing children */
1289 }
1290
1291 int
matchservent(const char * name1,const char * name2,const char * proto)1292 matchservent(const char *name1, const char *name2, const char *proto)
1293 {
1294 char **alias, *p;
1295 struct servent *se;
1296
1297 if (strcmp(proto, "unix") == 0) {
1298 if ((p = strrchr(name1, '/')) != NULL)
1299 name1 = p + 1;
1300 if ((p = strrchr(name2, '/')) != NULL)
1301 name2 = p + 1;
1302 }
1303 if (strcmp(name1, name2) == 0)
1304 return(1);
1305 if ((se = getservbyname(name1, proto)) != NULL) {
1306 if (strcmp(name2, se->s_name) == 0)
1307 return(1);
1308 for (alias = se->s_aliases; *alias; alias++)
1309 if (strcmp(name2, *alias) == 0)
1310 return(1);
1311 }
1312 return(0);
1313 }
1314
1315 struct servtab *
enter(struct servtab * cp)1316 enter(struct servtab *cp)
1317 {
1318 struct servtab *sep;
1319 long omask;
1320
1321 sep = (struct servtab *)malloc(sizeof (*sep));
1322 if (sep == NULL) {
1323 syslog(LOG_ERR, "malloc: %m");
1324 exit(EX_OSERR);
1325 }
1326 *sep = *cp;
1327 sep->se_fd = -1;
1328 omask = sigblock(SIGBLOCK);
1329 sep->se_next = servtab;
1330 servtab = sep;
1331 sigsetmask(omask);
1332 return (sep);
1333 }
1334
1335 void
enable(struct servtab * sep)1336 enable(struct servtab *sep)
1337 {
1338 if (debug)
1339 warnx(
1340 "enabling %s, fd %d", sep->se_service, sep->se_fd);
1341 #ifdef SANITY_CHECK
1342 if (sep->se_fd < 0) {
1343 syslog(LOG_ERR,
1344 "%s: %s: bad fd", __func__, sep->se_service);
1345 exit(EX_SOFTWARE);
1346 }
1347 if (ISMUX(sep)) {
1348 syslog(LOG_ERR,
1349 "%s: %s: is mux", __func__, sep->se_service);
1350 exit(EX_SOFTWARE);
1351 }
1352 if (FD_ISSET(sep->se_fd, &allsock)) {
1353 syslog(LOG_ERR,
1354 "%s: %s: not off", __func__, sep->se_service);
1355 exit(EX_SOFTWARE);
1356 }
1357 nsock++;
1358 #endif
1359 FD_SET(sep->se_fd, &allsock);
1360 if (sep->se_fd > maxsock)
1361 maxsock = sep->se_fd;
1362 }
1363
1364 void
disable(struct servtab * sep)1365 disable(struct servtab *sep)
1366 {
1367 if (debug)
1368 warnx(
1369 "disabling %s, fd %d", sep->se_service, sep->se_fd);
1370 #ifdef SANITY_CHECK
1371 if (sep->se_fd < 0) {
1372 syslog(LOG_ERR,
1373 "%s: %s: bad fd", __func__, sep->se_service);
1374 exit(EX_SOFTWARE);
1375 }
1376 if (ISMUX(sep)) {
1377 syslog(LOG_ERR,
1378 "%s: %s: is mux", __func__, sep->se_service);
1379 exit(EX_SOFTWARE);
1380 }
1381 if (!FD_ISSET(sep->se_fd, &allsock)) {
1382 syslog(LOG_ERR,
1383 "%s: %s: not on", __func__, sep->se_service);
1384 exit(EX_SOFTWARE);
1385 }
1386 if (nsock == 0) {
1387 syslog(LOG_ERR, "%s: nsock=0", __func__);
1388 exit(EX_SOFTWARE);
1389 }
1390 nsock--;
1391 #endif
1392 FD_CLR(sep->se_fd, &allsock);
1393 if (sep->se_fd == maxsock)
1394 maxsock--;
1395 }
1396
1397 FILE *fconfig = NULL;
1398 struct servtab serv;
1399 char line[LINE_MAX];
1400
1401 int
setconfig(void)1402 setconfig(void)
1403 {
1404
1405 if (fconfig != NULL) {
1406 fseek(fconfig, 0L, SEEK_SET);
1407 return (1);
1408 }
1409 fconfig = fopen(CONFIG, "r");
1410 return (fconfig != NULL);
1411 }
1412
1413 void
endconfig(void)1414 endconfig(void)
1415 {
1416 if (fconfig) {
1417 fclose(fconfig);
1418 fconfig = NULL;
1419 }
1420 }
1421
1422 struct servtab *
getconfigent(void)1423 getconfigent(void)
1424 {
1425 struct servtab *sep = &serv;
1426 int argc;
1427 char *cp, *arg, *s;
1428 char *versp;
1429 static char TCPMUX_TOKEN[] = "tcpmux/";
1430 #define MUX_LEN (sizeof(TCPMUX_TOKEN)-1)
1431 int v4bind = 0;
1432 #ifdef INET6
1433 int v6bind = 0;
1434 #endif
1435 int i;
1436
1437 more:
1438 while ((cp = nextline(fconfig)) != NULL) {
1439 if (*cp == '#' || *cp == '\0')
1440 continue;
1441 break;
1442 }
1443 if (cp == NULL)
1444 return (NULL);
1445 /*
1446 * clear the static buffer, since some fields (se_ctrladdr,
1447 * for example) don't get initialized here.
1448 */
1449 memset(sep, 0, sizeof *sep);
1450 arg = skip(&cp);
1451 if (cp == NULL) {
1452 /* got an empty line containing just blanks/tabs. */
1453 goto more;
1454 }
1455 if (arg[0] == ':') { /* :user:group:perm: */
1456 char *user, *group, *perm;
1457 struct passwd *pw;
1458 struct group *gr;
1459 user = arg+1;
1460 if ((group = strchr(user, ':')) == NULL) {
1461 syslog(LOG_ERR, "no group after user '%s'", user);
1462 goto more;
1463 }
1464 *group++ = '\0';
1465 if ((perm = strchr(group, ':')) == NULL) {
1466 syslog(LOG_ERR, "no mode after group '%s'", group);
1467 goto more;
1468 }
1469 *perm++ = '\0';
1470 if ((pw = getpwnam(user)) == NULL) {
1471 syslog(LOG_ERR, "no such user '%s'", user);
1472 goto more;
1473 }
1474 sep->se_sockuid = pw->pw_uid;
1475 if ((gr = getgrnam(group)) == NULL) {
1476 syslog(LOG_ERR, "no such user '%s'", group);
1477 goto more;
1478 }
1479 sep->se_sockgid = gr->gr_gid;
1480 sep->se_sockmode = strtol(perm, &arg, 8);
1481 if (*arg != ':') {
1482 syslog(LOG_ERR, "bad mode '%s'", perm);
1483 goto more;
1484 }
1485 *arg++ = '\0';
1486 } else {
1487 sep->se_sockuid = euid;
1488 sep->se_sockgid = egid;
1489 sep->se_sockmode = 0200;
1490 }
1491 if (strncmp(arg, TCPMUX_TOKEN, MUX_LEN) == 0) {
1492 char *c = arg + MUX_LEN;
1493 if (*c == '+') {
1494 sep->se_type = MUXPLUS_TYPE;
1495 c++;
1496 } else
1497 sep->se_type = MUX_TYPE;
1498 sep->se_service = newstr(c);
1499 } else {
1500 sep->se_service = newstr(arg);
1501 sep->se_type = NORM_TYPE;
1502 }
1503 arg = sskip(&cp);
1504 if (strcmp(arg, "stream") == 0)
1505 sep->se_socktype = SOCK_STREAM;
1506 else if (strcmp(arg, "dgram") == 0)
1507 sep->se_socktype = SOCK_DGRAM;
1508 else if (strcmp(arg, "rdm") == 0)
1509 sep->se_socktype = SOCK_RDM;
1510 else if (strcmp(arg, "seqpacket") == 0)
1511 sep->se_socktype = SOCK_SEQPACKET;
1512 else if (strcmp(arg, "raw") == 0)
1513 sep->se_socktype = SOCK_RAW;
1514 else
1515 sep->se_socktype = -1;
1516
1517 arg = sskip(&cp);
1518 if (strncmp(arg, "tcp", 3) == 0) {
1519 sep->se_proto = newstr(strsep(&arg, "/"));
1520 if (arg != NULL) {
1521 if (strcmp(arg, "ttcp") == 0)
1522 sep->se_type = TTCP_TYPE;
1523 }
1524 } else {
1525 sep->se_proto = newstr(arg);
1526 }
1527 if (strncmp(sep->se_proto, "rpc/", 4) == 0) {
1528 if (no_v4bind != 0) {
1529 syslog(LOG_NOTICE, "IPv4 bind is ignored for %s",
1530 sep->se_service);
1531 freeconfig(sep);
1532 goto more;
1533 }
1534 memmove(sep->se_proto, sep->se_proto + 4,
1535 strlen(sep->se_proto) + 1 - 4);
1536 sep->se_rpc = 1;
1537 sep->se_rpc_prog = sep->se_rpc_lowvers =
1538 sep->se_rpc_highvers = 0;
1539 memcpy(&sep->se_ctrladdr4, bind_sa4,
1540 sizeof(sep->se_ctrladdr4));
1541 if ((versp = strrchr(sep->se_service, '/'))) {
1542 *versp++ = '\0';
1543 switch (sscanf(versp, "%u-%u",
1544 &sep->se_rpc_lowvers,
1545 &sep->se_rpc_highvers)) {
1546 case 2:
1547 break;
1548 case 1:
1549 sep->se_rpc_highvers =
1550 sep->se_rpc_lowvers;
1551 break;
1552 default:
1553 syslog(LOG_ERR,
1554 "bad RPC version specifier; %s",
1555 sep->se_service);
1556 freeconfig(sep);
1557 goto more;
1558 }
1559 }
1560 else {
1561 sep->se_rpc_lowvers =
1562 sep->se_rpc_highvers = 1;
1563 }
1564 }
1565 sep->se_nomapped = 0;
1566 while (isdigit(sep->se_proto[strlen(sep->se_proto) - 1])) {
1567 #ifdef INET6
1568 if (sep->se_proto[strlen(sep->se_proto) - 1] == '6') {
1569 if (no_v6bind != 0) {
1570 syslog(LOG_NOTICE, "IPv6 bind is ignored for %s",
1571 sep->se_service);
1572 freeconfig(sep);
1573 goto more;
1574 }
1575 sep->se_proto[strlen(sep->se_proto) - 1] = '\0';
1576 v6bind = 1;
1577 continue;
1578 }
1579 #endif
1580 if (sep->se_proto[strlen(sep->se_proto) - 1] == '4') {
1581 sep->se_proto[strlen(sep->se_proto) - 1] = '\0';
1582 v4bind = 1;
1583 continue;
1584 }
1585 /* illegal version num */
1586 syslog(LOG_ERR, "bad IP version for %s", sep->se_proto);
1587 freeconfig(sep);
1588 goto more;
1589 }
1590 if (strcmp(sep->se_proto, "unix") == 0) {
1591 sep->se_family = AF_UNIX;
1592 } else
1593 #ifdef INET6
1594 if (v6bind != 0) {
1595 sep->se_family = AF_INET6;
1596 if (v4bind == 0 || no_v4bind != 0)
1597 sep->se_nomapped = 1;
1598 } else
1599 #endif
1600 { /* default to v4 bind if not v6 bind */
1601 if (no_v4bind != 0) {
1602 syslog(LOG_NOTICE, "IPv4 bind is ignored for %s",
1603 sep->se_service);
1604 freeconfig(sep);
1605 goto more;
1606 }
1607 sep->se_family = AF_INET;
1608 }
1609 /* init ctladdr */
1610 switch(sep->se_family) {
1611 case AF_INET:
1612 memcpy(&sep->se_ctrladdr4, bind_sa4,
1613 sizeof(sep->se_ctrladdr4));
1614 sep->se_ctrladdr_size = sizeof(sep->se_ctrladdr4);
1615 break;
1616 #ifdef INET6
1617 case AF_INET6:
1618 memcpy(&sep->se_ctrladdr6, bind_sa6,
1619 sizeof(sep->se_ctrladdr6));
1620 sep->se_ctrladdr_size = sizeof(sep->se_ctrladdr6);
1621 break;
1622 #endif
1623 case AF_UNIX:
1624 if (strlen(sep->se_service) >= sizeof(sep->se_ctrladdr_un.sun_path)) {
1625 syslog(LOG_ERR,
1626 "domain socket pathname too long for service %s",
1627 sep->se_service);
1628 goto more;
1629 }
1630 memset(&sep->se_ctrladdr, 0, sizeof(sep->se_ctrladdr));
1631 sep->se_ctrladdr_un.sun_family = sep->se_family;
1632 sep->se_ctrladdr_un.sun_len = strlen(sep->se_service);
1633 strcpy(sep->se_ctrladdr_un.sun_path, sep->se_service);
1634 sep->se_ctrladdr_size = SUN_LEN(&sep->se_ctrladdr_un);
1635 }
1636 arg = sskip(&cp);
1637 if (!strncmp(arg, "wait", 4))
1638 sep->se_accept = 0;
1639 else if (!strncmp(arg, "nowait", 6))
1640 sep->se_accept = 1;
1641 else {
1642 syslog(LOG_ERR,
1643 "%s: bad wait/nowait for service %s",
1644 CONFIG, sep->se_service);
1645 goto more;
1646 }
1647 sep->se_maxchild = -1;
1648 sep->se_maxcpm = -1;
1649 sep->se_maxperip = -1;
1650 if ((s = strchr(arg, '/')) != NULL) {
1651 char *eptr;
1652 u_long val;
1653
1654 val = strtoul(s + 1, &eptr, 10);
1655 if (eptr == s + 1 || val > MAX_MAXCHLD) {
1656 syslog(LOG_ERR,
1657 "%s: bad max-child for service %s",
1658 CONFIG, sep->se_service);
1659 goto more;
1660 }
1661 if (debug)
1662 if (!sep->se_accept && val != 1)
1663 warnx("maxchild=%lu for wait service %s"
1664 " not recommended", val, sep->se_service);
1665 sep->se_maxchild = val;
1666 if (*eptr == '/')
1667 sep->se_maxcpm = strtol(eptr + 1, &eptr, 10);
1668 if (*eptr == '/')
1669 sep->se_maxperip = strtol(eptr + 1, &eptr, 10);
1670 /*
1671 * explicitly do not check for \0 for future expansion /
1672 * backwards compatibility
1673 */
1674 }
1675 if (ISMUX(sep)) {
1676 /*
1677 * Silently enforce "nowait" mode for TCPMUX services
1678 * since they don't have an assigned port to listen on.
1679 */
1680 sep->se_accept = 1;
1681 if (strcmp(sep->se_proto, "tcp")) {
1682 syslog(LOG_ERR,
1683 "%s: bad protocol for tcpmux service %s",
1684 CONFIG, sep->se_service);
1685 goto more;
1686 }
1687 if (sep->se_socktype != SOCK_STREAM) {
1688 syslog(LOG_ERR,
1689 "%s: bad socket type for tcpmux service %s",
1690 CONFIG, sep->se_service);
1691 goto more;
1692 }
1693 }
1694 sep->se_user = newstr(sskip(&cp));
1695 #ifdef LOGIN_CAP
1696 if ((s = strrchr(sep->se_user, '/')) != NULL) {
1697 *s = '\0';
1698 sep->se_class = newstr(s + 1);
1699 } else
1700 sep->se_class = newstr(RESOURCE_RC);
1701 #endif
1702 if ((s = strrchr(sep->se_user, ':')) != NULL) {
1703 *s = '\0';
1704 sep->se_group = newstr(s + 1);
1705 } else
1706 sep->se_group = NULL;
1707 sep->se_server = newstr(sskip(&cp));
1708 if ((sep->se_server_name = strrchr(sep->se_server, '/')))
1709 sep->se_server_name++;
1710 if (strcmp(sep->se_server, "internal") == 0) {
1711 struct biltin *bi;
1712
1713 for (bi = biltins; bi->bi_service; bi++)
1714 if (bi->bi_socktype == sep->se_socktype &&
1715 matchservent(bi->bi_service, sep->se_service,
1716 sep->se_proto))
1717 break;
1718 if (bi->bi_service == 0) {
1719 syslog(LOG_ERR, "internal service %s unknown",
1720 sep->se_service);
1721 goto more;
1722 }
1723 sep->se_accept = 1; /* force accept mode for built-ins */
1724 sep->se_bi = bi;
1725 } else
1726 sep->se_bi = NULL;
1727 if (sep->se_maxperip < 0)
1728 sep->se_maxperip = maxperip;
1729 if (sep->se_maxcpm < 0)
1730 sep->se_maxcpm = maxcpm;
1731 if (sep->se_maxchild < 0) { /* apply default max-children */
1732 if (sep->se_bi && sep->se_bi->bi_maxchild >= 0)
1733 sep->se_maxchild = sep->se_bi->bi_maxchild;
1734 else if (sep->se_accept)
1735 sep->se_maxchild = maxchild > 0 ? maxchild : 0;
1736 else
1737 sep->se_maxchild = 1;
1738 }
1739 if (sep->se_maxchild > 0) {
1740 sep->se_pids = malloc(sep->se_maxchild * sizeof(*sep->se_pids));
1741 if (sep->se_pids == NULL) {
1742 syslog(LOG_ERR, "malloc: %m");
1743 exit(EX_OSERR);
1744 }
1745 }
1746 argc = 0;
1747 for (arg = skip(&cp); cp; arg = skip(&cp))
1748 if (argc < MAXARGV) {
1749 sep->se_argv[argc++] = newstr(arg);
1750 } else {
1751 syslog(LOG_ERR,
1752 "%s: too many arguments for service %s",
1753 CONFIG, sep->se_service);
1754 goto more;
1755 }
1756 while (argc <= MAXARGV)
1757 sep->se_argv[argc++] = NULL;
1758 for (i = 0; i < PERIPSIZE; ++i)
1759 LIST_INIT(&sep->se_conn[i]);
1760 return (sep);
1761 }
1762
1763 void
freeconfig(struct servtab * cp)1764 freeconfig(struct servtab *cp)
1765 {
1766 int i;
1767
1768 if (cp->se_service)
1769 free(cp->se_service);
1770 if (cp->se_proto)
1771 free(cp->se_proto);
1772 if (cp->se_user)
1773 free(cp->se_user);
1774 if (cp->se_group)
1775 free(cp->se_group);
1776 #ifdef LOGIN_CAP
1777 if (cp->se_class)
1778 free(cp->se_class);
1779 #endif
1780 if (cp->se_server)
1781 free(cp->se_server);
1782 if (cp->se_pids)
1783 free(cp->se_pids);
1784 for (i = 0; i < MAXARGV; i++)
1785 if (cp->se_argv[i])
1786 free(cp->se_argv[i]);
1787 free_connlist(cp);
1788 }
1789
1790
1791 /*
1792 * Safe skip - if skip returns null, log a syntax error in the
1793 * configuration file and exit.
1794 */
1795 char *
sskip(char ** cpp)1796 sskip(char **cpp)
1797 {
1798 char *cp;
1799
1800 cp = skip(cpp);
1801 if (cp == NULL) {
1802 syslog(LOG_ERR, "%s: syntax error", CONFIG);
1803 exit(EX_DATAERR);
1804 }
1805 return (cp);
1806 }
1807
1808 char *
skip(char ** cpp)1809 skip(char **cpp)
1810 {
1811 char *cp = *cpp;
1812 char *start;
1813 char quote = '\0';
1814
1815 again:
1816 while (*cp == ' ' || *cp == '\t')
1817 cp++;
1818 if (*cp == '\0') {
1819 int c;
1820
1821 c = getc(fconfig);
1822 ungetc(c, fconfig);
1823 if (c == ' ' || c == '\t')
1824 if ((cp = nextline(fconfig)))
1825 goto again;
1826 *cpp = NULL;
1827 return (NULL);
1828 }
1829 if (*cp == '"' || *cp == '\'')
1830 quote = *cp++;
1831 start = cp;
1832 if (quote)
1833 while (*cp && *cp != quote)
1834 cp++;
1835 else
1836 while (*cp && *cp != ' ' && *cp != '\t')
1837 cp++;
1838 if (*cp != '\0')
1839 *cp++ = '\0';
1840 *cpp = cp;
1841 return (start);
1842 }
1843
1844 char *
nextline(FILE * fd)1845 nextline(FILE *fd)
1846 {
1847 char *cp;
1848
1849 if (fgets(line, sizeof (line), fd) == NULL)
1850 return (NULL);
1851 cp = strchr(line, '\n');
1852 if (cp)
1853 *cp = '\0';
1854 return (line);
1855 }
1856
1857 char *
newstr(const char * cp)1858 newstr(const char *cp)
1859 {
1860 char *cr;
1861
1862 if ((cr = strdup(cp != NULL ? cp : "")))
1863 return (cr);
1864 syslog(LOG_ERR, "strdup: %m");
1865 exit(EX_OSERR);
1866 }
1867
1868 void
inetd_setproctitle(const char * a,int s)1869 inetd_setproctitle(const char *a, int s)
1870 {
1871 socklen_t size;
1872 struct sockaddr_storage ss;
1873 char buf[80], pbuf[INET6_ADDRSTRLEN];
1874
1875 size = sizeof(ss);
1876 if (getpeername(s, (struct sockaddr *)&ss, &size) == 0) {
1877 getnameinfo((struct sockaddr *)&ss, size, pbuf, sizeof(pbuf),
1878 NULL, 0, NI_NUMERICHOST|NI_WITHSCOPEID);
1879 sprintf(buf, "%s [%s]", a, pbuf);
1880 } else
1881 sprintf(buf, "%s", a);
1882 setproctitle("%s", buf);
1883 }
1884
1885 int
check_loop(const struct sockaddr * sa,const struct servtab * sep)1886 check_loop(const struct sockaddr *sa, const struct servtab *sep)
1887 {
1888 struct servtab *se2;
1889 char pname[INET6_ADDRSTRLEN];
1890
1891 for (se2 = servtab; se2; se2 = se2->se_next) {
1892 if (!se2->se_bi || se2->se_socktype != SOCK_DGRAM)
1893 continue;
1894
1895 switch (se2->se_family) {
1896 case AF_INET:
1897 if (((const struct sockaddr_in *)sa)->sin_port ==
1898 se2->se_ctrladdr4.sin_port)
1899 goto isloop;
1900 continue;
1901 #ifdef INET6
1902 case AF_INET6:
1903 if (((const struct sockaddr_in *)sa)->sin_port ==
1904 se2->se_ctrladdr4.sin_port)
1905 goto isloop;
1906 continue;
1907 #endif
1908 default:
1909 continue;
1910 }
1911 isloop:
1912 getnameinfo(sa, sa->sa_len, pname, sizeof(pname), NULL, 0,
1913 NI_NUMERICHOST|NI_WITHSCOPEID);
1914 syslog(LOG_WARNING, "%s/%s:%s/%s loop request REFUSED from %s",
1915 sep->se_service, sep->se_proto,
1916 se2->se_service, se2->se_proto,
1917 pname);
1918 return 1;
1919 }
1920 return 0;
1921 }
1922
1923 /*
1924 * print_service:
1925 * Dump relevant information to stderr
1926 */
1927 void
print_service(const char * action,const struct servtab * sep)1928 print_service(const char *action, const struct servtab *sep)
1929 {
1930 fprintf(stderr,
1931 "%s: %s proto=%s accept=%d max=%d user=%s group=%s"
1932 #ifdef LOGIN_CAP
1933 "class=%s"
1934 #endif
1935 " builtin=%p server=%s"
1936 "\n",
1937 action, sep->se_service, sep->se_proto,
1938 sep->se_accept, sep->se_maxchild, sep->se_user, sep->se_group,
1939 #ifdef LOGIN_CAP
1940 sep->se_class,
1941 #endif
1942 (void *) sep->se_bi, sep->se_server
1943 );
1944 }
1945
1946 #define CPMHSIZE 256
1947 #define CPMHMASK (CPMHSIZE-1)
1948 #define CHTGRAN 10
1949 #define CHTSIZE 6
1950
1951 typedef struct CTime {
1952 unsigned long ct_Ticks;
1953 int ct_Count;
1954 } CTime;
1955
1956 typedef struct CHash {
1957 union {
1958 struct in_addr c4_Addr;
1959 struct in6_addr c6_Addr;
1960 } cu_Addr;
1961 #define ch_Addr4 cu_Addr.c4_Addr
1962 #define ch_Addr6 cu_Addr.c6_Addr
1963 int ch_Family;
1964 time_t ch_LTime;
1965 char *ch_Service;
1966 CTime ch_Times[CHTSIZE];
1967 } CHash;
1968
1969 CHash CHashAry[CPMHSIZE];
1970
1971 int
cpmip(const struct servtab * sep,int ctrl)1972 cpmip(const struct servtab *sep, int ctrl)
1973 {
1974 struct sockaddr_storage rss;
1975 socklen_t rssLen = sizeof(rss);
1976 int r = 0;
1977
1978 /*
1979 * If getpeername() fails, just let it through (if logging is
1980 * enabled the condition is caught elsewhere)
1981 */
1982
1983 if (sep->se_maxcpm > 0 &&
1984 getpeername(ctrl, (struct sockaddr *)&rss, &rssLen) == 0 ) {
1985 time_t t = time(NULL);
1986 int hv = 0xABC3D20F;
1987 int i;
1988 int cnt = 0;
1989 CHash *chBest = NULL;
1990 unsigned int ticks = t / CHTGRAN;
1991 struct sockaddr_in *sin4;
1992 #ifdef INET6
1993 struct sockaddr_in6 *sin6;
1994 #endif
1995
1996 sin4 = (struct sockaddr_in *)&rss;
1997 #ifdef INET6
1998 sin6 = (struct sockaddr_in6 *)&rss;
1999 #endif
2000 {
2001 char *p;
2002 int addrlen;
2003
2004 switch (rss.ss_family) {
2005 case AF_INET:
2006 p = (char *)&sin4->sin_addr;
2007 addrlen = sizeof(struct in_addr);
2008 break;
2009 #ifdef INET6
2010 case AF_INET6:
2011 p = (char *)&sin6->sin6_addr;
2012 addrlen = sizeof(struct in6_addr);
2013 break;
2014 #endif
2015 default:
2016 /* should not happen */
2017 return -1;
2018 }
2019
2020 for (i = 0; i < addrlen; ++i, ++p) {
2021 hv = (hv << 5) ^ (hv >> 23) ^ *p;
2022 }
2023 hv = (hv ^ (hv >> 16));
2024 }
2025 for (i = 0; i < 5; ++i) {
2026 CHash *ch = &CHashAry[(hv + i) & CPMHMASK];
2027
2028 if (rss.ss_family == AF_INET &&
2029 ch->ch_Family == AF_INET &&
2030 sin4->sin_addr.s_addr == ch->ch_Addr4.s_addr &&
2031 ch->ch_Service && strcmp(sep->se_service,
2032 ch->ch_Service) == 0) {
2033 chBest = ch;
2034 break;
2035 }
2036 #ifdef INET6
2037 if (rss.ss_family == AF_INET6 &&
2038 ch->ch_Family == AF_INET6 &&
2039 IN6_ARE_ADDR_EQUAL(&sin6->sin6_addr,
2040 &ch->ch_Addr6) != 0 &&
2041 ch->ch_Service && strcmp(sep->se_service,
2042 ch->ch_Service) == 0) {
2043 chBest = ch;
2044 break;
2045 }
2046 #endif
2047 if (chBest == NULL || ch->ch_LTime == 0 ||
2048 ch->ch_LTime < chBest->ch_LTime) {
2049 chBest = ch;
2050 }
2051 }
2052 if ((rss.ss_family == AF_INET &&
2053 (chBest->ch_Family != AF_INET ||
2054 sin4->sin_addr.s_addr != chBest->ch_Addr4.s_addr)) ||
2055 chBest->ch_Service == NULL ||
2056 strcmp(sep->se_service, chBest->ch_Service) != 0) {
2057 chBest->ch_Family = sin4->sin_family;
2058 chBest->ch_Addr4 = sin4->sin_addr;
2059 if (chBest->ch_Service)
2060 free(chBest->ch_Service);
2061 chBest->ch_Service = strdup(sep->se_service);
2062 bzero(chBest->ch_Times, sizeof(chBest->ch_Times));
2063 }
2064 #ifdef INET6
2065 if ((rss.ss_family == AF_INET6 &&
2066 (chBest->ch_Family != AF_INET6 ||
2067 IN6_ARE_ADDR_EQUAL(&sin6->sin6_addr,
2068 &chBest->ch_Addr6) == 0)) ||
2069 chBest->ch_Service == NULL ||
2070 strcmp(sep->se_service, chBest->ch_Service) != 0) {
2071 chBest->ch_Family = sin6->sin6_family;
2072 chBest->ch_Addr6 = sin6->sin6_addr;
2073 if (chBest->ch_Service)
2074 free(chBest->ch_Service);
2075 chBest->ch_Service = strdup(sep->se_service);
2076 bzero(chBest->ch_Times, sizeof(chBest->ch_Times));
2077 }
2078 #endif
2079 chBest->ch_LTime = t;
2080 {
2081 CTime *ct = &chBest->ch_Times[ticks % CHTSIZE];
2082 if (ct->ct_Ticks != ticks) {
2083 ct->ct_Ticks = ticks;
2084 ct->ct_Count = 0;
2085 }
2086 ++ct->ct_Count;
2087 }
2088 for (i = 0; i < CHTSIZE; ++i) {
2089 CTime *ct = &chBest->ch_Times[i];
2090 if (ct->ct_Ticks <= ticks &&
2091 ct->ct_Ticks >= ticks - CHTSIZE) {
2092 cnt += ct->ct_Count;
2093 }
2094 }
2095 if (cnt * (CHTSIZE * CHTGRAN) / 60 > sep->se_maxcpm) {
2096 char pname[INET6_ADDRSTRLEN];
2097
2098 getnameinfo((struct sockaddr *)&rss,
2099 ((struct sockaddr *)&rss)->sa_len,
2100 pname, sizeof(pname), NULL, 0,
2101 NI_NUMERICHOST|NI_WITHSCOPEID);
2102 r = -1;
2103 syslog(LOG_ERR,
2104 "%s from %s exceeded counts/min (limit %d/min)",
2105 sep->se_service, pname,
2106 sep->se_maxcpm);
2107 }
2108 }
2109 return(r);
2110 }
2111
2112 static struct conninfo *
search_conn(struct servtab * sep,int ctrl)2113 search_conn(struct servtab *sep, int ctrl)
2114 {
2115 struct sockaddr_storage ss;
2116 socklen_t sslen = sizeof(ss);
2117 struct conninfo *conn;
2118 int hv;
2119 char pname[NI_MAXHOST], pname2[NI_MAXHOST];
2120
2121 if (sep->se_maxperip <= 0)
2122 return NULL;
2123
2124 /*
2125 * If getpeername() fails, just let it through (if logging is
2126 * enabled the condition is caught elsewhere)
2127 */
2128 if (getpeername(ctrl, (struct sockaddr *)&ss, &sslen) != 0)
2129 return NULL;
2130
2131 switch (ss.ss_family) {
2132 case AF_INET:
2133 hv = hashval((char *)&((struct sockaddr_in *)&ss)->sin_addr,
2134 sizeof(struct in_addr));
2135 break;
2136 #ifdef INET6
2137 case AF_INET6:
2138 hv = hashval((char *)&((struct sockaddr_in6 *)&ss)->sin6_addr,
2139 sizeof(struct in6_addr));
2140 break;
2141 #endif
2142 default:
2143 /*
2144 * Since we only support AF_INET and AF_INET6, just
2145 * let other than AF_INET and AF_INET6 through.
2146 */
2147 return NULL;
2148 }
2149
2150 if (getnameinfo((struct sockaddr *)&ss, sslen, pname, sizeof(pname),
2151 NULL, 0, NI_NUMERICHOST | NI_WITHSCOPEID) != 0)
2152 return NULL;
2153
2154 LIST_FOREACH(conn, &sep->se_conn[hv], co_link) {
2155 if (getnameinfo((struct sockaddr *)&conn->co_addr,
2156 conn->co_addr.ss_len, pname2, sizeof(pname2), NULL, 0,
2157 NI_NUMERICHOST | NI_WITHSCOPEID) == 0 &&
2158 strcmp(pname, pname2) == 0)
2159 break;
2160 }
2161
2162 if (conn == NULL) {
2163 if ((conn = malloc(sizeof(struct conninfo))) == NULL) {
2164 syslog(LOG_ERR, "malloc: %m");
2165 exit(EX_OSERR);
2166 }
2167 conn->co_proc = malloc(sep->se_maxperip * sizeof(*conn->co_proc));
2168 if (conn->co_proc == NULL) {
2169 syslog(LOG_ERR, "malloc: %m");
2170 exit(EX_OSERR);
2171 }
2172 memcpy(&conn->co_addr, (struct sockaddr *)&ss, sslen);
2173 conn->co_numchild = 0;
2174 LIST_INSERT_HEAD(&sep->se_conn[hv], conn, co_link);
2175 }
2176
2177 /*
2178 * Since a child process is not invoked yet, we cannot
2179 * determine a pid of a child. So, co_proc and co_numchild
2180 * should be filled leter.
2181 */
2182
2183 return conn;
2184 }
2185
2186 static int
room_conn(struct servtab * sep,struct conninfo * conn)2187 room_conn(struct servtab *sep, struct conninfo *conn)
2188 {
2189 char pname[NI_MAXHOST];
2190
2191 if (conn->co_numchild >= sep->se_maxperip) {
2192 getnameinfo((struct sockaddr *)&conn->co_addr,
2193 conn->co_addr.ss_len, pname, sizeof(pname), NULL, 0,
2194 NI_NUMERICHOST | NI_WITHSCOPEID);
2195 syslog(LOG_ERR, "%s from %s exceeded counts (limit %d)",
2196 sep->se_service, pname, sep->se_maxperip);
2197 return 0;
2198 }
2199 return 1;
2200 }
2201
2202 static void
addchild_conn(struct conninfo * conn,pid_t pid)2203 addchild_conn(struct conninfo *conn, pid_t pid)
2204 {
2205 struct procinfo *proc;
2206
2207 if (conn == NULL)
2208 return;
2209
2210 if ((proc = search_proc(pid, 1)) != NULL) {
2211 if (proc->pr_conn != NULL) {
2212 syslog(LOG_ERR,
2213 "addchild_conn: child already on process list");
2214 exit(EX_OSERR);
2215 }
2216 proc->pr_conn = conn;
2217 }
2218
2219 conn->co_proc[conn->co_numchild++] = proc;
2220 }
2221
2222 static void
reapchild_conn(pid_t pid)2223 reapchild_conn(pid_t pid)
2224 {
2225 struct procinfo *proc;
2226 struct conninfo *conn;
2227 int i;
2228
2229 if ((proc = search_proc(pid, 0)) == NULL)
2230 return;
2231 if ((conn = proc->pr_conn) == NULL)
2232 return;
2233 for (i = 0; i < conn->co_numchild; ++i)
2234 if (conn->co_proc[i] == proc) {
2235 conn->co_proc[i] = conn->co_proc[--conn->co_numchild];
2236 break;
2237 }
2238 free_proc(proc);
2239 free_conn(conn);
2240 }
2241
2242 static void
resize_conn(struct servtab * sep,int maxpip)2243 resize_conn(struct servtab *sep, int maxpip)
2244 {
2245 struct conninfo *conn;
2246 int i, j;
2247
2248 if (sep->se_maxperip <= 0)
2249 return;
2250 if (maxpip <= 0) {
2251 free_connlist(sep);
2252 return;
2253 }
2254 for (i = 0; i < PERIPSIZE; ++i) {
2255 LIST_FOREACH(conn, &sep->se_conn[i], co_link) {
2256 for (j = maxpip; j < conn->co_numchild; ++j)
2257 free_proc(conn->co_proc[j]);
2258 conn->co_proc = realloc(conn->co_proc,
2259 maxpip * sizeof(*conn->co_proc));
2260 if (conn->co_proc == NULL) {
2261 syslog(LOG_ERR, "realloc: %m");
2262 exit(EX_OSERR);
2263 }
2264 if (conn->co_numchild > maxpip)
2265 conn->co_numchild = maxpip;
2266 }
2267 }
2268 }
2269
2270 static void
free_connlist(struct servtab * sep)2271 free_connlist(struct servtab *sep)
2272 {
2273 struct conninfo *conn;
2274 int i, j;
2275
2276 for (i = 0; i < PERIPSIZE; ++i) {
2277 while ((conn = LIST_FIRST(&sep->se_conn[i])) != NULL) {
2278 for (j = 0; j < conn->co_numchild; ++j)
2279 free_proc(conn->co_proc[j]);
2280 conn->co_numchild = 0;
2281 free_conn(conn);
2282 }
2283 }
2284 }
2285
2286 static void
free_conn(struct conninfo * conn)2287 free_conn(struct conninfo *conn)
2288 {
2289 if (conn == NULL)
2290 return;
2291 if (conn->co_numchild <= 0) {
2292 LIST_REMOVE(conn, co_link);
2293 free(conn->co_proc);
2294 free(conn);
2295 }
2296 }
2297
2298 static struct procinfo *
search_proc(pid_t pid,int add)2299 search_proc(pid_t pid, int add)
2300 {
2301 struct procinfo *proc;
2302 int hv;
2303
2304 hv = hashval((char *)&pid, sizeof(pid));
2305 LIST_FOREACH(proc, &proctable[hv], pr_link) {
2306 if (proc->pr_pid == pid)
2307 break;
2308 }
2309 if (proc == NULL && add) {
2310 if ((proc = malloc(sizeof(struct procinfo))) == NULL) {
2311 syslog(LOG_ERR, "malloc: %m");
2312 exit(EX_OSERR);
2313 }
2314 proc->pr_pid = pid;
2315 proc->pr_conn = NULL;
2316 LIST_INSERT_HEAD(&proctable[hv], proc, pr_link);
2317 }
2318 return proc;
2319 }
2320
2321 static void
free_proc(struct procinfo * proc)2322 free_proc(struct procinfo *proc)
2323 {
2324 if (proc == NULL)
2325 return;
2326 LIST_REMOVE(proc, pr_link);
2327 free(proc);
2328 }
2329
2330 static int
hashval(char * p,int len)2331 hashval(char *p, int len)
2332 {
2333 int i, hv = 0xABC3D20F;
2334
2335 for (i = 0; i < len; ++i, ++p)
2336 hv = (hv << 5) ^ (hv >> 23) ^ *p;
2337 hv = (hv ^ (hv >> 16)) & (PERIPSIZE - 1);
2338 return hv;
2339 }
2340