1 /* 2 * Copyright (c) 1983, 1991, 1993, 1994 3 * The Regents of the University of California. All rights reserved. 4 * 5 * Redistribution and use in source and binary forms, with or without 6 * modification, are permitted provided that the following conditions 7 * are met: 8 * 1. Redistributions of source code must retain the above copyright 9 * notice, this list of conditions and the following disclaimer. 10 * 2. Redistributions in binary form must reproduce the above copyright 11 * notice, this list of conditions and the following disclaimer in the 12 * documentation and/or other materials provided with the distribution. 13 * 3. All advertising materials mentioning features or use of this software 14 * must display the following acknowledgement: 15 * This product includes software developed by the University of 16 * California, Berkeley and its contributors. 17 * 4. Neither the name of the University nor the names of its contributors 18 * may be used to endorse or promote products derived from this software 19 * without specific prior written permission. 20 * 21 * THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND 22 * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE 23 * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE 24 * ARE DISCLAIMED. IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE 25 * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL 26 * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS 27 * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) 28 * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT 29 * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY 30 * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF 31 * SUCH DAMAGE. 32 */ 33 34 #ifndef lint 35 static const char copyright[] = 36 "@(#) Copyright (c) 1983, 1991, 1993, 1994\n\ 37 The Regents of the University of California. All rights reserved.\n"; 38 #endif /* not lint */ 39 40 #ifndef lint 41 #if 0 42 static char sccsid[] = "@(#)from: inetd.c 8.4 (Berkeley) 4/13/94"; 43 #endif 44 #endif /* not lint */ 45 46 #include <sys/cdefs.h> 47 __FBSDID("$FreeBSD$"); 48 49 /* 50 * Inetd - Internet super-server 51 * 52 * This program invokes all internet services as needed. Connection-oriented 53 * services are invoked each time a connection is made, by creating a process. 54 * This process is passed the connection as file descriptor 0 and is expected 55 * to do a getpeername to find out the source host and port. 56 * 57 * Datagram oriented services are invoked when a datagram 58 * arrives; a process is created and passed a pending message 59 * on file descriptor 0. Datagram servers may either connect 60 * to their peer, freeing up the original socket for inetd 61 * to receive further messages on, or ``take over the socket'', 62 * processing all arriving datagrams and, eventually, timing 63 * out. The first type of server is said to be ``multi-threaded''; 64 * the second type of server ``single-threaded''. 65 * 66 * Inetd uses a configuration file which is read at startup 67 * and, possibly, at some later time in response to a hangup signal. 68 * The configuration file is ``free format'' with fields given in the 69 * order shown below. Continuation lines for an entry must begin with 70 * a space or tab. All fields must be present in each entry. 71 * 72 * service name must be in /etc/services 73 * or name a tcpmux service 74 * or specify a unix domain socket 75 * socket type stream/dgram/raw/rdm/seqpacket 76 * protocol tcp[4][6][/faith,ttcp], udp[4][6], unix 77 * wait/nowait single-threaded/multi-threaded 78 * user user to run daemon as 79 * server program full path name 80 * server program arguments maximum of MAXARGS (20) 81 * 82 * TCP services without official port numbers are handled with the 83 * RFC1078-based tcpmux internal service. Tcpmux listens on port 1 for 84 * requests. When a connection is made from a foreign host, the service 85 * requested is passed to tcpmux, which looks it up in the servtab list 86 * and returns the proper entry for the service. Tcpmux returns a 87 * negative reply if the service doesn't exist, otherwise the invoked 88 * server is expected to return the positive reply if the service type in 89 * inetd.conf file has the prefix "tcpmux/". If the service type has the 90 * prefix "tcpmux/+", tcpmux will return the positive reply for the 91 * process; this is for compatibility with older server code, and also 92 * allows you to invoke programs that use stdin/stdout without putting any 93 * special server code in them. Services that use tcpmux are "nowait" 94 * because they do not have a well-known port and hence cannot listen 95 * for new requests. 96 * 97 * For RPC services 98 * service name/version must be in /etc/rpc 99 * socket type stream/dgram/raw/rdm/seqpacket 100 * protocol rpc/tcp[4][6], rpc/udp[4][6] 101 * wait/nowait single-threaded/multi-threaded 102 * user user to run daemon as 103 * server program full path name 104 * server program arguments maximum of MAXARGS 105 * 106 * Comment lines are indicated by a `#' in column 1. 107 * 108 * #ifdef IPSEC 109 * Comment lines that start with "#@" denote IPsec policy string, as described 110 * in ipsec_set_policy(3). This will affect all the following items in 111 * inetd.conf(8). To reset the policy, just use "#@" line. By default, 112 * there's no IPsec policy. 113 * #endif 114 */ 115 #include <sys/param.h> 116 #include <sys/ioctl.h> 117 #include <sys/wait.h> 118 #include <sys/time.h> 119 #include <sys/resource.h> 120 #include <sys/stat.h> 121 #include <sys/un.h> 122 123 #include <netinet/in.h> 124 #include <netinet/tcp.h> 125 #include <arpa/inet.h> 126 #include <rpc/rpc.h> 127 #include <rpc/pmap_clnt.h> 128 129 #include <errno.h> 130 #include <err.h> 131 #include <fcntl.h> 132 #include <grp.h> 133 #include <netdb.h> 134 #include <pwd.h> 135 #include <signal.h> 136 #include <stdio.h> 137 #include <stdlib.h> 138 #include <string.h> 139 #include <syslog.h> 140 #include <tcpd.h> 141 #include <unistd.h> 142 #include <libutil.h> 143 #include <sysexits.h> 144 #include <ctype.h> 145 146 #include "inetd.h" 147 #include "pathnames.h" 148 149 #ifdef IPSEC 150 #include <netinet6/ipsec.h> 151 #ifndef IPSEC_POLICY_IPSEC /* no ipsec support on old ipsec */ 152 #undef IPSEC 153 #endif 154 #endif 155 156 /* wrapper for KAME-special getnameinfo() */ 157 #ifndef NI_WITHSCOPEID 158 #define NI_WITHSCOPEID 0 159 #endif 160 161 #ifndef LIBWRAP_ALLOW_FACILITY 162 # define LIBWRAP_ALLOW_FACILITY LOG_AUTH 163 #endif 164 #ifndef LIBWRAP_ALLOW_SEVERITY 165 # define LIBWRAP_ALLOW_SEVERITY LOG_INFO 166 #endif 167 #ifndef LIBWRAP_DENY_FACILITY 168 # define LIBWRAP_DENY_FACILITY LOG_AUTH 169 #endif 170 #ifndef LIBWRAP_DENY_SEVERITY 171 # define LIBWRAP_DENY_SEVERITY LOG_WARNING 172 #endif 173 174 #define ISWRAP(sep) \ 175 ( ((wrap_ex && !(sep)->se_bi) || (wrap_bi && (sep)->se_bi)) \ 176 && (sep->se_family == AF_INET || sep->se_family == AF_INET6) \ 177 && ( ((sep)->se_accept && (sep)->se_socktype == SOCK_STREAM) \ 178 || (sep)->se_socktype == SOCK_DGRAM)) 179 180 #ifdef LOGIN_CAP 181 #include <login_cap.h> 182 183 /* see init.c */ 184 #define RESOURCE_RC "daemon" 185 186 #endif 187 188 #ifndef MAXCHILD 189 #define MAXCHILD -1 /* maximum number of this service 190 < 0 = no limit */ 191 #endif 192 193 #ifndef MAXCPM 194 #define MAXCPM -1 /* rate limit invocations from a 195 single remote address, 196 < 0 = no limit */ 197 #endif 198 199 #ifndef MAXPERIP 200 #define MAXPERIP -1 /* maximum number of this service 201 from a single remote address, 202 < 0 = no limit */ 203 #endif 204 205 #ifndef TOOMANY 206 #define TOOMANY 256 /* don't start more than TOOMANY */ 207 #endif 208 #define CNT_INTVL 60 /* servers in CNT_INTVL sec. */ 209 #define RETRYTIME (60*10) /* retry after bind or server fail */ 210 #define MAX_MAXCHLD 32767 /* max allowable max children */ 211 212 #define SIGBLOCK (sigmask(SIGCHLD)|sigmask(SIGHUP)|sigmask(SIGALRM)) 213 214 void close_sep(struct servtab *); 215 void flag_signal(int); 216 void flag_config(int); 217 void config(void); 218 int cpmip(const struct servtab *, int); 219 void endconfig(void); 220 struct servtab *enter(struct servtab *); 221 void freeconfig(struct servtab *); 222 struct servtab *getconfigent(void); 223 int matchservent(const char *, const char *, const char *); 224 char *nextline(FILE *); 225 void addchild(struct servtab *, int); 226 void flag_reapchild(int); 227 void reapchild(void); 228 void enable(struct servtab *); 229 void disable(struct servtab *); 230 void flag_retry(int); 231 void retry(void); 232 int setconfig(void); 233 void setup(struct servtab *); 234 #ifdef IPSEC 235 void ipsecsetup(struct servtab *); 236 #endif 237 void unregisterrpc(register struct servtab *sep); 238 static struct conninfo *search_conn(struct servtab *sep, int ctrl); 239 static int room_conn(struct servtab *sep, struct conninfo *conn); 240 static void addchild_conn(struct conninfo *conn, pid_t pid); 241 static void reapchild_conn(pid_t pid); 242 static void free_conn(struct conninfo *conn); 243 static void resize_conn(struct servtab *sep, int maxperip); 244 static void free_connlist(struct servtab *sep); 245 static void free_proc(struct procinfo *); 246 static struct procinfo *search_proc(pid_t pid, int add); 247 static int hashval(char *p, int len); 248 249 int allow_severity; 250 int deny_severity; 251 int wrap_ex = 0; 252 int wrap_bi = 0; 253 int debug = 0; 254 int log = 0; 255 int maxsock; /* highest-numbered descriptor */ 256 fd_set allsock; 257 int options; 258 int timingout; 259 int toomany = TOOMANY; 260 int maxchild = MAXCHILD; 261 int maxcpm = MAXCPM; 262 int maxperip = MAXPERIP; 263 struct servent *sp; 264 struct rpcent *rpc; 265 char *hostname = NULL; 266 struct sockaddr_in *bind_sa4; 267 int v4bind_ok = 0; 268 #ifdef INET6 269 struct sockaddr_in6 *bind_sa6; 270 int v6bind_ok = 0; 271 #endif 272 int signalpipe[2]; 273 #ifdef SANITY_CHECK 274 int nsock; 275 #endif 276 uid_t euid; 277 gid_t egid; 278 mode_t mask; 279 280 struct servtab *servtab; 281 282 extern struct biltin biltins[]; 283 284 const char *CONFIG = _PATH_INETDCONF; 285 const char *pid_file = _PATH_INETDPID; 286 287 struct netconfig *udpconf, *tcpconf, *udp6conf, *tcp6conf; 288 289 static LIST_HEAD(, procinfo) proctable[PERIPSIZE]; 290 291 int 292 getvalue(const char *arg, int *value, const char *whine) 293 { 294 int tmp; 295 char *p; 296 297 tmp = strtol(arg, &p, 0); 298 if (tmp < 0 || *p) { 299 syslog(LOG_ERR, whine, arg); 300 return 1; /* failure */ 301 } 302 *value = tmp; 303 return 0; /* success */ 304 } 305 306 int 307 main(int argc, char **argv) 308 { 309 struct servtab *sep; 310 struct passwd *pwd; 311 struct group *grp; 312 struct sigaction sa, saalrm, sachld, sahup, sapipe; 313 int tmpint, ch, dofork; 314 pid_t pid; 315 char buf[50]; 316 #ifdef LOGIN_CAP 317 login_cap_t *lc = NULL; 318 #endif 319 struct request_info req; 320 int denied; 321 char *service = NULL; 322 union { 323 struct sockaddr peer_un; 324 struct sockaddr_in peer_un4; 325 struct sockaddr_in6 peer_un6; 326 struct sockaddr_storage peer_max; 327 } p_un; 328 #define peer p_un.peer_un 329 #define peer4 p_un.peer_un4 330 #define peer6 p_un.peer_un6 331 #define peermax p_un.peer_max 332 int i; 333 struct addrinfo hints, *res; 334 const char *servname; 335 int error; 336 struct conninfo *conn; 337 338 openlog("inetd", LOG_PID | LOG_NOWAIT | LOG_PERROR, LOG_DAEMON); 339 340 while ((ch = getopt(argc, argv, "dlwWR:a:c:C:p:s:")) != -1) 341 switch(ch) { 342 case 'd': 343 debug = 1; 344 options |= SO_DEBUG; 345 break; 346 case 'l': 347 log = 1; 348 break; 349 case 'R': 350 getvalue(optarg, &toomany, 351 "-R %s: bad value for service invocation rate"); 352 break; 353 case 'c': 354 getvalue(optarg, &maxchild, 355 "-c %s: bad value for maximum children"); 356 break; 357 case 'C': 358 getvalue(optarg, &maxcpm, 359 "-C %s: bad value for maximum children/minute"); 360 break; 361 case 'a': 362 hostname = optarg; 363 break; 364 case 'p': 365 pid_file = optarg; 366 break; 367 case 's': 368 getvalue(optarg, &maxperip, 369 "-s %s: bad value for maximum children per source address"); 370 break; 371 case 'w': 372 wrap_ex++; 373 break; 374 case 'W': 375 wrap_bi++; 376 break; 377 case '?': 378 default: 379 syslog(LOG_ERR, 380 "usage: inetd [-dlwW] [-a address] [-R rate]" 381 " [-c maximum] [-C rate]" 382 " [-p pidfile] [conf-file]"); 383 exit(EX_USAGE); 384 } 385 /* 386 * Initialize Bind Addrs. 387 * When hostname is NULL, wild card bind addrs are obtained from 388 * getaddrinfo(). But getaddrinfo() requires at least one of 389 * hostname or servname is non NULL. 390 * So when hostname is NULL, set dummy value to servname. 391 */ 392 servname = (hostname == NULL) ? "discard" /* dummy */ : NULL; 393 394 bzero(&hints, sizeof(struct addrinfo)); 395 hints.ai_flags = AI_PASSIVE; 396 hints.ai_family = AF_UNSPEC; 397 error = getaddrinfo(hostname, servname, &hints, &res); 398 if (error != 0) { 399 syslog(LOG_ERR, "-a %s: %s", hostname, gai_strerror(error)); 400 if (error == EAI_SYSTEM) 401 syslog(LOG_ERR, "%s", strerror(errno)); 402 exit(EX_USAGE); 403 } 404 do { 405 if (res->ai_addr == NULL) { 406 syslog(LOG_ERR, "-a %s: getaddrinfo failed", hostname); 407 exit(EX_USAGE); 408 } 409 switch (res->ai_addr->sa_family) { 410 case AF_INET: 411 if (v4bind_ok) 412 continue; 413 bind_sa4 = (struct sockaddr_in *)res->ai_addr; 414 /* init port num in case servname is dummy */ 415 bind_sa4->sin_port = 0; 416 v4bind_ok = 1; 417 continue; 418 #ifdef INET6 419 case AF_INET6: 420 if (v6bind_ok) 421 continue; 422 bind_sa6 = (struct sockaddr_in6 *)res->ai_addr; 423 /* init port num in case servname is dummy */ 424 bind_sa6->sin6_port = 0; 425 v6bind_ok = 1; 426 continue; 427 #endif 428 } 429 if (v4bind_ok 430 #ifdef INET6 431 && v6bind_ok 432 #endif 433 ) 434 break; 435 } while ((res = res->ai_next) != NULL); 436 if (!v4bind_ok 437 #ifdef INET6 438 && !v6bind_ok 439 #endif 440 ) { 441 syslog(LOG_ERR, "-a %s: unknown address family", hostname); 442 exit(EX_USAGE); 443 } 444 445 euid = geteuid(); 446 egid = getegid(); 447 umask(mask = umask(0777)); 448 449 argc -= optind; 450 argv += optind; 451 452 if (argc > 0) 453 CONFIG = argv[0]; 454 if (debug == 0) { 455 FILE *fp; 456 if (daemon(0, 0) < 0) { 457 syslog(LOG_WARNING, "daemon(0,0) failed: %m"); 458 } 459 /* From now on we don't want syslog messages going to stderr. */ 460 closelog(); 461 openlog("inetd", LOG_PID | LOG_NOWAIT, LOG_DAEMON); 462 /* 463 * In case somebody has started inetd manually, we need to 464 * clear the logname, so that old servers run as root do not 465 * get the user's logname.. 466 */ 467 if (setlogin("") < 0) { 468 syslog(LOG_WARNING, "cannot clear logname: %m"); 469 /* no big deal if it fails.. */ 470 } 471 pid = getpid(); 472 fp = fopen(pid_file, "w"); 473 if (fp) { 474 fprintf(fp, "%ld\n", (long)pid); 475 fclose(fp); 476 } else { 477 syslog(LOG_WARNING, "%s: %m", pid_file); 478 } 479 } 480 481 for (i = 0; i < PERIPSIZE; ++i) 482 LIST_INIT(&proctable[i]); 483 484 if (v4bind_ok) { 485 udpconf = getnetconfigent("udp"); 486 tcpconf = getnetconfigent("tcp"); 487 if (udpconf == NULL || tcpconf == NULL) { 488 syslog(LOG_ERR, "unknown rpc/udp or rpc/tcp"); 489 exit(EX_USAGE); 490 } 491 } 492 #ifdef INET6 493 if (v6bind_ok) { 494 udp6conf = getnetconfigent("udp6"); 495 tcp6conf = getnetconfigent("tcp6"); 496 if (udp6conf == NULL || tcp6conf == NULL) { 497 syslog(LOG_ERR, "unknown rpc/udp6 or rpc/tcp6"); 498 exit(EX_USAGE); 499 } 500 } 501 #endif 502 503 sa.sa_flags = 0; 504 sigemptyset(&sa.sa_mask); 505 sigaddset(&sa.sa_mask, SIGALRM); 506 sigaddset(&sa.sa_mask, SIGCHLD); 507 sigaddset(&sa.sa_mask, SIGHUP); 508 sa.sa_handler = flag_retry; 509 sigaction(SIGALRM, &sa, &saalrm); 510 config(); 511 sa.sa_handler = flag_config; 512 sigaction(SIGHUP, &sa, &sahup); 513 sa.sa_handler = flag_reapchild; 514 sigaction(SIGCHLD, &sa, &sachld); 515 sa.sa_handler = SIG_IGN; 516 sigaction(SIGPIPE, &sa, &sapipe); 517 518 { 519 /* space for daemons to overwrite environment for ps */ 520 #define DUMMYSIZE 100 521 char dummy[DUMMYSIZE]; 522 523 (void)memset(dummy, 'x', DUMMYSIZE - 1); 524 dummy[DUMMYSIZE - 1] = '\0'; 525 (void)setenv("inetd_dummy", dummy, 1); 526 } 527 528 if (pipe(signalpipe) != 0) { 529 syslog(LOG_ERR, "pipe: %m"); 530 exit(EX_OSERR); 531 } 532 FD_SET(signalpipe[0], &allsock); 533 #ifdef SANITY_CHECK 534 nsock++; 535 #endif 536 if (signalpipe[0] > maxsock) 537 maxsock = signalpipe[0]; 538 if (signalpipe[1] > maxsock) 539 maxsock = signalpipe[1]; 540 541 for (;;) { 542 int n, ctrl; 543 fd_set readable; 544 545 #ifdef SANITY_CHECK 546 if (nsock == 0) { 547 syslog(LOG_ERR, "%s: nsock=0", __FUNCTION__); 548 exit(EX_SOFTWARE); 549 } 550 #endif 551 readable = allsock; 552 if ((n = select(maxsock + 1, &readable, (fd_set *)0, 553 (fd_set *)0, (struct timeval *)0)) <= 0) { 554 if (n < 0 && errno != EINTR) { 555 syslog(LOG_WARNING, "select: %m"); 556 sleep(1); 557 } 558 continue; 559 } 560 /* handle any queued signal flags */ 561 if (FD_ISSET(signalpipe[0], &readable)) { 562 int nsig; 563 if (ioctl(signalpipe[0], FIONREAD, &nsig) != 0) { 564 syslog(LOG_ERR, "ioctl: %m"); 565 exit(EX_OSERR); 566 } 567 while (--nsig >= 0) { 568 char c; 569 if (read(signalpipe[0], &c, 1) != 1) { 570 syslog(LOG_ERR, "read: %m"); 571 exit(EX_OSERR); 572 } 573 if (debug) 574 warnx("handling signal flag %c", c); 575 switch(c) { 576 case 'A': /* sigalrm */ 577 retry(); 578 break; 579 case 'C': /* sigchld */ 580 reapchild(); 581 break; 582 case 'H': /* sighup */ 583 config(); 584 break; 585 } 586 } 587 } 588 for (sep = servtab; n && sep; sep = sep->se_next) 589 if (sep->se_fd != -1 && FD_ISSET(sep->se_fd, &readable)) { 590 n--; 591 if (debug) 592 warnx("someone wants %s", sep->se_service); 593 dofork = !sep->se_bi || sep->se_bi->bi_fork || ISWRAP(sep); 594 conn = NULL; 595 if (sep->se_accept && sep->se_socktype == SOCK_STREAM) { 596 i = 1; 597 if (ioctl(sep->se_fd, FIONBIO, &i) < 0) 598 syslog(LOG_ERR, "ioctl (FIONBIO, 1): %m"); 599 ctrl = accept(sep->se_fd, (struct sockaddr *)0, 600 (socklen_t *)0); 601 if (debug) 602 warnx("accept, ctrl %d", ctrl); 603 if (ctrl < 0) { 604 if (errno != EINTR) 605 syslog(LOG_WARNING, 606 "accept (for %s): %m", 607 sep->se_service); 608 if (sep->se_accept && 609 sep->se_socktype == SOCK_STREAM) 610 close(ctrl); 611 continue; 612 } 613 i = 0; 614 if (ioctl(sep->se_fd, FIONBIO, &i) < 0) 615 syslog(LOG_ERR, "ioctl1(FIONBIO, 0): %m"); 616 if (ioctl(ctrl, FIONBIO, &i) < 0) 617 syslog(LOG_ERR, "ioctl2(FIONBIO, 0): %m"); 618 if (cpmip(sep, ctrl) < 0) { 619 close(ctrl); 620 continue; 621 } 622 if (dofork && 623 (conn = search_conn(sep, ctrl)) != NULL && 624 !room_conn(sep, conn)) { 625 close(ctrl); 626 continue; 627 } 628 } else 629 ctrl = sep->se_fd; 630 if (log && !ISWRAP(sep)) { 631 char pname[INET6_ADDRSTRLEN] = "unknown"; 632 socklen_t sl; 633 sl = sizeof peermax; 634 if (getpeername(ctrl, (struct sockaddr *) 635 &peermax, &sl)) { 636 sl = sizeof peermax; 637 if (recvfrom(ctrl, buf, sizeof(buf), 638 MSG_PEEK, 639 (struct sockaddr *)&peermax, 640 &sl) >= 0) { 641 getnameinfo((struct sockaddr *)&peermax, 642 peer.sa_len, 643 pname, sizeof(pname), 644 NULL, 0, 645 NI_NUMERICHOST| 646 NI_WITHSCOPEID); 647 } 648 } else { 649 getnameinfo((struct sockaddr *)&peermax, 650 peer.sa_len, 651 pname, sizeof(pname), 652 NULL, 0, 653 NI_NUMERICHOST| 654 NI_WITHSCOPEID); 655 } 656 syslog(LOG_INFO,"%s from %s", sep->se_service, pname); 657 } 658 (void) sigblock(SIGBLOCK); 659 pid = 0; 660 /* 661 * Fork for all external services, builtins which need to 662 * fork and anything we're wrapping (as wrapping might 663 * block or use hosts_options(5) twist). 664 */ 665 if (dofork) { 666 if (sep->se_count++ == 0) 667 (void)gettimeofday(&sep->se_time, (struct timezone *)NULL); 668 else if (toomany > 0 && sep->se_count >= toomany) { 669 struct timeval now; 670 671 (void)gettimeofday(&now, (struct timezone *)NULL); 672 if (now.tv_sec - sep->se_time.tv_sec > 673 CNT_INTVL) { 674 sep->se_time = now; 675 sep->se_count = 1; 676 } else { 677 syslog(LOG_ERR, 678 "%s/%s server failing (looping), service terminated", 679 sep->se_service, sep->se_proto); 680 if (sep->se_accept && 681 sep->se_socktype == SOCK_STREAM) 682 close(ctrl); 683 close_sep(sep); 684 free_conn(conn); 685 sigsetmask(0L); 686 if (!timingout) { 687 timingout = 1; 688 alarm(RETRYTIME); 689 } 690 continue; 691 } 692 } 693 pid = fork(); 694 } 695 if (pid < 0) { 696 syslog(LOG_ERR, "fork: %m"); 697 if (sep->se_accept && 698 sep->se_socktype == SOCK_STREAM) 699 close(ctrl); 700 free_conn(conn); 701 sigsetmask(0L); 702 sleep(1); 703 continue; 704 } 705 if (pid) { 706 addchild_conn(conn, pid); 707 addchild(sep, pid); 708 } 709 sigsetmask(0L); 710 if (pid == 0) { 711 if (dofork) { 712 if (debug) 713 warnx("+ closing from %d", maxsock); 714 for (tmpint = maxsock; tmpint > 2; tmpint--) 715 if (tmpint != ctrl) 716 (void) close(tmpint); 717 sigaction(SIGALRM, &saalrm, (struct sigaction *)0); 718 sigaction(SIGCHLD, &sachld, (struct sigaction *)0); 719 sigaction(SIGHUP, &sahup, (struct sigaction *)0); 720 /* SIGPIPE reset before exec */ 721 } 722 /* 723 * Call tcpmux to find the real service to exec. 724 */ 725 if (sep->se_bi && 726 sep->se_bi->bi_fn == (bi_fn_t *) tcpmux) { 727 sep = tcpmux(ctrl); 728 if (sep == NULL) { 729 close(ctrl); 730 _exit(0); 731 } 732 } 733 if (ISWRAP(sep)) { 734 inetd_setproctitle("wrapping", ctrl); 735 service = sep->se_server_name ? 736 sep->se_server_name : sep->se_service; 737 request_init(&req, RQ_DAEMON, service, RQ_FILE, ctrl, NULL); 738 fromhost(&req); 739 deny_severity = LIBWRAP_DENY_FACILITY|LIBWRAP_DENY_SEVERITY; 740 allow_severity = LIBWRAP_ALLOW_FACILITY|LIBWRAP_ALLOW_SEVERITY; 741 denied = !hosts_access(&req); 742 if (denied) { 743 syslog(deny_severity, 744 "refused connection from %.500s, service %s (%s%s)", 745 eval_client(&req), service, sep->se_proto, 746 (((struct sockaddr *)req.client->sin)->sa_family == AF_INET6 && !IN6_IS_ADDR_V4MAPPED(&((struct sockaddr_in6 *)req.client->sin)->sin6_addr)) ? "6" : ""); 747 if (sep->se_socktype != SOCK_STREAM) 748 recv(ctrl, buf, sizeof (buf), 0); 749 if (dofork) { 750 sleep(1); 751 _exit(0); 752 } 753 } 754 if (log) { 755 syslog(allow_severity, 756 "connection from %.500s, service %s (%s%s)", 757 eval_client(&req), service, sep->se_proto, 758 (((struct sockaddr *)req.client->sin)->sa_family == AF_INET6 && !IN6_IS_ADDR_V4MAPPED(&((struct sockaddr_in6 *)req.client->sin)->sin6_addr)) ? "6" : ""); 759 } 760 } 761 if (sep->se_bi) { 762 (*sep->se_bi->bi_fn)(ctrl, sep); 763 } else { 764 if (debug) 765 warnx("%d execl %s", 766 getpid(), sep->se_server); 767 dup2(ctrl, 0); 768 close(ctrl); 769 dup2(0, 1); 770 dup2(0, 2); 771 if ((pwd = getpwnam(sep->se_user)) == NULL) { 772 syslog(LOG_ERR, 773 "%s/%s: %s: no such user", 774 sep->se_service, sep->se_proto, 775 sep->se_user); 776 if (sep->se_socktype != SOCK_STREAM) 777 recv(0, buf, sizeof (buf), 0); 778 _exit(EX_NOUSER); 779 } 780 grp = NULL; 781 if ( sep->se_group != NULL 782 && (grp = getgrnam(sep->se_group)) == NULL 783 ) { 784 syslog(LOG_ERR, 785 "%s/%s: %s: no such group", 786 sep->se_service, sep->se_proto, 787 sep->se_group); 788 if (sep->se_socktype != SOCK_STREAM) 789 recv(0, buf, sizeof (buf), 0); 790 _exit(EX_NOUSER); 791 } 792 if (grp != NULL) 793 pwd->pw_gid = grp->gr_gid; 794 #ifdef LOGIN_CAP 795 if ((lc = login_getclass(sep->se_class)) == NULL) { 796 /* error syslogged by getclass */ 797 syslog(LOG_ERR, 798 "%s/%s: %s: login class error", 799 sep->se_service, sep->se_proto, 800 sep->se_class); 801 if (sep->se_socktype != SOCK_STREAM) 802 recv(0, buf, sizeof (buf), 0); 803 _exit(EX_NOUSER); 804 } 805 #endif 806 if (setsid() < 0) { 807 syslog(LOG_ERR, 808 "%s: can't setsid(): %m", 809 sep->se_service); 810 /* _exit(EX_OSERR); not fatal yet */ 811 } 812 #ifdef LOGIN_CAP 813 if (setusercontext(lc, pwd, pwd->pw_uid, 814 LOGIN_SETALL) != 0) { 815 syslog(LOG_ERR, 816 "%s: can't setusercontext(..%s..): %m", 817 sep->se_service, sep->se_user); 818 _exit(EX_OSERR); 819 } 820 #else 821 if (pwd->pw_uid) { 822 if (setlogin(sep->se_user) < 0) { 823 syslog(LOG_ERR, 824 "%s: can't setlogin(%s): %m", 825 sep->se_service, sep->se_user); 826 /* _exit(EX_OSERR); not yet */ 827 } 828 if (setgid(pwd->pw_gid) < 0) { 829 syslog(LOG_ERR, 830 "%s: can't set gid %d: %m", 831 sep->se_service, pwd->pw_gid); 832 _exit(EX_OSERR); 833 } 834 (void) initgroups(pwd->pw_name, 835 pwd->pw_gid); 836 if (setuid(pwd->pw_uid) < 0) { 837 syslog(LOG_ERR, 838 "%s: can't set uid %d: %m", 839 sep->se_service, pwd->pw_uid); 840 _exit(EX_OSERR); 841 } 842 } 843 #endif 844 sigaction(SIGPIPE, &sapipe, 845 (struct sigaction *)0); 846 execv(sep->se_server, sep->se_argv); 847 syslog(LOG_ERR, 848 "cannot execute %s: %m", sep->se_server); 849 if (sep->se_socktype != SOCK_STREAM) 850 recv(0, buf, sizeof (buf), 0); 851 } 852 if (dofork) 853 _exit(0); 854 } 855 if (sep->se_accept && sep->se_socktype == SOCK_STREAM) 856 close(ctrl); 857 } 858 } 859 } 860 861 /* 862 * Add a signal flag to the signal flag queue for later handling 863 */ 864 865 void 866 flag_signal(int c) 867 { 868 char ch = c; 869 870 if (write(signalpipe[1], &ch, 1) != 1) { 871 syslog(LOG_ERR, "write: %m"); 872 _exit(EX_OSERR); 873 } 874 } 875 876 /* 877 * Record a new child pid for this service. If we've reached the 878 * limit on children, then stop accepting incoming requests. 879 */ 880 881 void 882 addchild(struct servtab *sep, pid_t pid) 883 { 884 if (sep->se_maxchild <= 0) 885 return; 886 #ifdef SANITY_CHECK 887 if (sep->se_numchild >= sep->se_maxchild) { 888 syslog(LOG_ERR, "%s: %d >= %d", 889 __FUNCTION__, sep->se_numchild, sep->se_maxchild); 890 exit(EX_SOFTWARE); 891 } 892 #endif 893 sep->se_pids[sep->se_numchild++] = pid; 894 if (sep->se_numchild == sep->se_maxchild) 895 disable(sep); 896 } 897 898 /* 899 * Some child process has exited. See if it's on somebody's list. 900 */ 901 902 void 903 flag_reapchild(int signo __unused) 904 { 905 flag_signal('C'); 906 } 907 908 void 909 reapchild(void) 910 { 911 int k, status; 912 pid_t pid; 913 struct servtab *sep; 914 915 for (;;) { 916 pid = wait3(&status, WNOHANG, (struct rusage *)0); 917 if (pid <= 0) 918 break; 919 if (debug) 920 warnx("%d reaped, %s %u", pid, 921 WIFEXITED(status) ? "status" : "signal", 922 WIFEXITED(status) ? WEXITSTATUS(status) 923 : WTERMSIG(status)); 924 for (sep = servtab; sep; sep = sep->se_next) { 925 for (k = 0; k < sep->se_numchild; k++) 926 if (sep->se_pids[k] == pid) 927 break; 928 if (k == sep->se_numchild) 929 continue; 930 if (sep->se_numchild == sep->se_maxchild) 931 enable(sep); 932 sep->se_pids[k] = sep->se_pids[--sep->se_numchild]; 933 if (WIFSIGNALED(status) || WEXITSTATUS(status)) 934 syslog(LOG_WARNING, 935 "%s[%d]: exited, %s %u", 936 sep->se_server, pid, 937 WIFEXITED(status) ? "status" : "signal", 938 WIFEXITED(status) ? WEXITSTATUS(status) 939 : WTERMSIG(status)); 940 break; 941 } 942 reapchild_conn(pid); 943 } 944 } 945 946 void 947 flag_config(int signo __unused) 948 { 949 flag_signal('H'); 950 } 951 952 void 953 config(void) 954 { 955 struct servtab *sep, *new, **sepp; 956 long omask; 957 int new_nomapped; 958 959 if (!setconfig()) { 960 syslog(LOG_ERR, "%s: %m", CONFIG); 961 return; 962 } 963 for (sep = servtab; sep; sep = sep->se_next) 964 sep->se_checked = 0; 965 while ((new = getconfigent())) { 966 if (getpwnam(new->se_user) == NULL) { 967 syslog(LOG_ERR, 968 "%s/%s: no such user '%s', service ignored", 969 new->se_service, new->se_proto, new->se_user); 970 continue; 971 } 972 if (new->se_group && getgrnam(new->se_group) == NULL) { 973 syslog(LOG_ERR, 974 "%s/%s: no such group '%s', service ignored", 975 new->se_service, new->se_proto, new->se_group); 976 continue; 977 } 978 #ifdef LOGIN_CAP 979 if (login_getclass(new->se_class) == NULL) { 980 /* error syslogged by getclass */ 981 syslog(LOG_ERR, 982 "%s/%s: %s: login class error, service ignored", 983 new->se_service, new->se_proto, new->se_class); 984 continue; 985 } 986 #endif 987 new_nomapped = new->se_nomapped; 988 for (sep = servtab; sep; sep = sep->se_next) 989 if (strcmp(sep->se_service, new->se_service) == 0 && 990 strcmp(sep->se_proto, new->se_proto) == 0 && 991 sep->se_rpc == new->se_rpc && 992 sep->se_socktype == new->se_socktype && 993 sep->se_family == new->se_family) 994 break; 995 if (sep != 0) { 996 int i; 997 998 #define SWAP(t,a, b) { t c = a; a = b; b = c; } 999 omask = sigblock(SIGBLOCK); 1000 if (sep->se_nomapped != new->se_nomapped) { 1001 /* for rpc keep old nommaped till unregister */ 1002 if (!sep->se_rpc) 1003 sep->se_nomapped = new->se_nomapped; 1004 sep->se_reset = 1; 1005 } 1006 /* copy over outstanding child pids */ 1007 if (sep->se_maxchild > 0 && new->se_maxchild > 0) { 1008 new->se_numchild = sep->se_numchild; 1009 if (new->se_numchild > new->se_maxchild) 1010 new->se_numchild = new->se_maxchild; 1011 memcpy(new->se_pids, sep->se_pids, 1012 new->se_numchild * sizeof(*new->se_pids)); 1013 } 1014 SWAP(pid_t *, sep->se_pids, new->se_pids); 1015 sep->se_maxchild = new->se_maxchild; 1016 sep->se_numchild = new->se_numchild; 1017 sep->se_maxcpm = new->se_maxcpm; 1018 resize_conn(sep, new->se_maxperip); 1019 sep->se_maxperip = new->se_maxperip; 1020 sep->se_bi = new->se_bi; 1021 /* might need to turn on or off service now */ 1022 if (sep->se_fd >= 0) { 1023 if (sep->se_maxchild > 0 1024 && sep->se_numchild == sep->se_maxchild) { 1025 if (FD_ISSET(sep->se_fd, &allsock)) 1026 disable(sep); 1027 } else { 1028 if (!FD_ISSET(sep->se_fd, &allsock)) 1029 enable(sep); 1030 } 1031 } 1032 sep->se_accept = new->se_accept; 1033 SWAP(char *, sep->se_user, new->se_user); 1034 SWAP(char *, sep->se_group, new->se_group); 1035 #ifdef LOGIN_CAP 1036 SWAP(char *, sep->se_class, new->se_class); 1037 #endif 1038 SWAP(char *, sep->se_server, new->se_server); 1039 SWAP(char *, sep->se_server_name, new->se_server_name); 1040 for (i = 0; i < MAXARGV; i++) 1041 SWAP(char *, sep->se_argv[i], new->se_argv[i]); 1042 #ifdef IPSEC 1043 SWAP(char *, sep->se_policy, new->se_policy); 1044 ipsecsetup(sep); 1045 #endif 1046 sigsetmask(omask); 1047 freeconfig(new); 1048 if (debug) 1049 print_service("REDO", sep); 1050 } else { 1051 sep = enter(new); 1052 if (debug) 1053 print_service("ADD ", sep); 1054 } 1055 sep->se_checked = 1; 1056 if (ISMUX(sep)) { 1057 sep->se_fd = -1; 1058 continue; 1059 } 1060 switch (sep->se_family) { 1061 case AF_INET: 1062 if (!v4bind_ok) { 1063 sep->se_fd = -1; 1064 continue; 1065 } 1066 break; 1067 #ifdef INET6 1068 case AF_INET6: 1069 if (!v6bind_ok) { 1070 sep->se_fd = -1; 1071 continue; 1072 } 1073 break; 1074 #endif 1075 } 1076 if (!sep->se_rpc) { 1077 if (sep->se_family != AF_UNIX) { 1078 sp = getservbyname(sep->se_service, sep->se_proto); 1079 if (sp == 0) { 1080 syslog(LOG_ERR, "%s/%s: unknown service", 1081 sep->se_service, sep->se_proto); 1082 sep->se_checked = 0; 1083 continue; 1084 } 1085 } 1086 switch (sep->se_family) { 1087 case AF_INET: 1088 if (sp->s_port != sep->se_ctrladdr4.sin_port) { 1089 sep->se_ctrladdr4.sin_port = 1090 sp->s_port; 1091 sep->se_reset = 1; 1092 } 1093 break; 1094 #ifdef INET6 1095 case AF_INET6: 1096 if (sp->s_port != 1097 sep->se_ctrladdr6.sin6_port) { 1098 sep->se_ctrladdr6.sin6_port = 1099 sp->s_port; 1100 sep->se_reset = 1; 1101 } 1102 break; 1103 #endif 1104 } 1105 if (sep->se_reset != 0 && sep->se_fd >= 0) 1106 close_sep(sep); 1107 } else { 1108 rpc = getrpcbyname(sep->se_service); 1109 if (rpc == 0) { 1110 syslog(LOG_ERR, "%s/%s unknown RPC service", 1111 sep->se_service, sep->se_proto); 1112 if (sep->se_fd != -1) 1113 (void) close(sep->se_fd); 1114 sep->se_fd = -1; 1115 continue; 1116 } 1117 if (sep->se_reset != 0 || 1118 rpc->r_number != sep->se_rpc_prog) { 1119 if (sep->se_rpc_prog) 1120 unregisterrpc(sep); 1121 sep->se_rpc_prog = rpc->r_number; 1122 if (sep->se_fd != -1) 1123 (void) close(sep->se_fd); 1124 sep->se_fd = -1; 1125 } 1126 sep->se_nomapped = new_nomapped; 1127 } 1128 sep->se_reset = 0; 1129 if (sep->se_fd == -1) 1130 setup(sep); 1131 } 1132 endconfig(); 1133 /* 1134 * Purge anything not looked at above. 1135 */ 1136 omask = sigblock(SIGBLOCK); 1137 sepp = &servtab; 1138 while ((sep = *sepp)) { 1139 if (sep->se_checked) { 1140 sepp = &sep->se_next; 1141 continue; 1142 } 1143 *sepp = sep->se_next; 1144 if (sep->se_fd >= 0) 1145 close_sep(sep); 1146 if (debug) 1147 print_service("FREE", sep); 1148 if (sep->se_rpc && sep->se_rpc_prog > 0) 1149 unregisterrpc(sep); 1150 freeconfig(sep); 1151 free(sep); 1152 } 1153 (void) sigsetmask(omask); 1154 } 1155 1156 void 1157 unregisterrpc(struct servtab *sep) 1158 { 1159 u_int i; 1160 struct servtab *sepp; 1161 long omask; 1162 struct netconfig *netid4, *netid6; 1163 1164 omask = sigblock(SIGBLOCK); 1165 netid4 = sep->se_socktype == SOCK_DGRAM ? udpconf : tcpconf; 1166 netid6 = sep->se_socktype == SOCK_DGRAM ? udp6conf : tcp6conf; 1167 if (sep->se_family == AF_INET) 1168 netid6 = NULL; 1169 else if (sep->se_nomapped) 1170 netid4 = NULL; 1171 /* 1172 * Conflict if same prog and protocol - In that case one should look 1173 * to versions, but it is not interesting: having separate servers for 1174 * different versions does not work well. 1175 * Therefore one do not unregister if there is a conflict. 1176 * There is also transport conflict if destroying INET when INET46 1177 * exists, or destroying INET46 when INET exists 1178 */ 1179 for (sepp = servtab; sepp; sepp = sepp->se_next) { 1180 if (sepp == sep) 1181 continue; 1182 if (sepp->se_checked == 0 || 1183 !sepp->se_rpc || 1184 strcmp(sep->se_proto, sepp->se_proto) != 0 || 1185 sep->se_rpc_prog != sepp->se_rpc_prog) 1186 continue; 1187 if (sepp->se_family == AF_INET) 1188 netid4 = NULL; 1189 if (sepp->se_family == AF_INET6) { 1190 netid6 = NULL; 1191 if (!sep->se_nomapped) 1192 netid4 = NULL; 1193 } 1194 if (netid4 == NULL && netid6 == NULL) 1195 return; 1196 } 1197 if (debug) 1198 print_service("UNREG", sep); 1199 for (i = sep->se_rpc_lowvers; i <= sep->se_rpc_highvers; i++) { 1200 if (netid4) 1201 rpcb_unset(sep->se_rpc_prog, i, netid4); 1202 if (netid6) 1203 rpcb_unset(sep->se_rpc_prog, i, netid6); 1204 } 1205 if (sep->se_fd != -1) 1206 (void) close(sep->se_fd); 1207 sep->se_fd = -1; 1208 (void) sigsetmask(omask); 1209 } 1210 1211 void 1212 flag_retry(int signo __unused) 1213 { 1214 flag_signal('A'); 1215 } 1216 1217 void 1218 retry(void) 1219 { 1220 struct servtab *sep; 1221 1222 timingout = 0; 1223 for (sep = servtab; sep; sep = sep->se_next) 1224 if (sep->se_fd == -1 && !ISMUX(sep)) 1225 setup(sep); 1226 } 1227 1228 void 1229 setup(struct servtab *sep) 1230 { 1231 int on = 1; 1232 1233 if ((sep->se_fd = socket(sep->se_family, sep->se_socktype, 0)) < 0) { 1234 if (debug) 1235 warn("socket failed on %s/%s", 1236 sep->se_service, sep->se_proto); 1237 syslog(LOG_ERR, "%s/%s: socket: %m", 1238 sep->se_service, sep->se_proto); 1239 return; 1240 } 1241 #define turnon(fd, opt) \ 1242 setsockopt(fd, SOL_SOCKET, opt, (char *)&on, sizeof (on)) 1243 if (strcmp(sep->se_proto, "tcp") == 0 && (options & SO_DEBUG) && 1244 turnon(sep->se_fd, SO_DEBUG) < 0) 1245 syslog(LOG_ERR, "setsockopt (SO_DEBUG): %m"); 1246 if (turnon(sep->se_fd, SO_REUSEADDR) < 0) 1247 syslog(LOG_ERR, "setsockopt (SO_REUSEADDR): %m"); 1248 #ifdef SO_PRIVSTATE 1249 if (turnon(sep->se_fd, SO_PRIVSTATE) < 0) 1250 syslog(LOG_ERR, "setsockopt (SO_PRIVSTATE): %m"); 1251 #endif 1252 /* tftpd opens a new connection then needs more infos */ 1253 if ((sep->se_family == AF_INET6) && 1254 (strcmp(sep->se_proto, "udp") == 0) && 1255 (sep->se_accept == 0) && 1256 (setsockopt(sep->se_fd, IPPROTO_IPV6, IPV6_PKTINFO, 1257 (char *)&on, sizeof (on)) < 0)) 1258 syslog(LOG_ERR, "setsockopt (IPV6_RECVPKTINFO): %m"); 1259 if (sep->se_family == AF_INET6) { 1260 int flag = sep->se_nomapped ? 1 : 0; 1261 if (setsockopt(sep->se_fd, IPPROTO_IPV6, IPV6_V6ONLY, 1262 (char *)&flag, sizeof (flag)) < 0) 1263 syslog(LOG_ERR, "setsockopt (IPV6_V6ONLY): %m"); 1264 } 1265 #undef turnon 1266 if (sep->se_type == TTCP_TYPE) 1267 if (setsockopt(sep->se_fd, IPPROTO_TCP, TCP_NOPUSH, 1268 (char *)&on, sizeof (on)) < 0) 1269 syslog(LOG_ERR, "setsockopt (TCP_NOPUSH): %m"); 1270 #ifdef IPV6_FAITH 1271 if (sep->se_type == FAITH_TYPE) { 1272 if (setsockopt(sep->se_fd, IPPROTO_IPV6, IPV6_FAITH, &on, 1273 sizeof(on)) < 0) { 1274 syslog(LOG_ERR, "setsockopt (IPV6_FAITH): %m"); 1275 } 1276 } 1277 #endif 1278 #ifdef IPSEC 1279 ipsecsetup(sep); 1280 #endif 1281 if (sep->se_family == AF_UNIX) { 1282 (void) unlink(sep->se_ctrladdr_un.sun_path); 1283 umask(0777); /* Make socket with conservative permissions */ 1284 } 1285 if (bind(sep->se_fd, (struct sockaddr *)&sep->se_ctrladdr, 1286 sep->se_ctrladdr_size) < 0) { 1287 if (debug) 1288 warn("bind failed on %s/%s", 1289 sep->se_service, sep->se_proto); 1290 syslog(LOG_ERR, "%s/%s: bind: %m", 1291 sep->se_service, sep->se_proto); 1292 (void) close(sep->se_fd); 1293 sep->se_fd = -1; 1294 if (!timingout) { 1295 timingout = 1; 1296 alarm(RETRYTIME); 1297 } 1298 if (sep->se_family == AF_UNIX) 1299 umask(mask); 1300 return; 1301 } 1302 if (sep->se_family == AF_UNIX) { 1303 /* Ick - fch{own,mod} don't work on Unix domain sockets */ 1304 if (chown(sep->se_service, sep->se_sockuid, sep->se_sockgid) < 0) 1305 syslog(LOG_ERR, "chown socket: %m"); 1306 if (chmod(sep->se_service, sep->se_sockmode) < 0) 1307 syslog(LOG_ERR, "chmod socket: %m"); 1308 umask(mask); 1309 } 1310 if (sep->se_rpc) { 1311 u_int i; 1312 socklen_t len = sep->se_ctrladdr_size; 1313 struct netconfig *netid, *netid2 = NULL; 1314 struct sockaddr_in sock; 1315 struct netbuf nbuf, nbuf2; 1316 1317 if (getsockname(sep->se_fd, 1318 (struct sockaddr*)&sep->se_ctrladdr, &len) < 0){ 1319 syslog(LOG_ERR, "%s/%s: getsockname: %m", 1320 sep->se_service, sep->se_proto); 1321 (void) close(sep->se_fd); 1322 sep->se_fd = -1; 1323 return; 1324 } 1325 nbuf.buf = &sep->se_ctrladdr; 1326 nbuf.len = sep->se_ctrladdr.sa_len; 1327 if (sep->se_family == AF_INET) 1328 netid = sep->se_socktype==SOCK_DGRAM? udpconf:tcpconf; 1329 else { 1330 netid = sep->se_socktype==SOCK_DGRAM? udp6conf:tcp6conf; 1331 if (!sep->se_nomapped) { /* INET and INET6 */ 1332 netid2 = netid==udp6conf? udpconf:tcpconf; 1333 memset(&sock, 0, sizeof sock); /* ADDR_ANY */ 1334 nbuf2.buf = &sock; 1335 nbuf2.len = sock.sin_len = sizeof sock; 1336 sock.sin_family = AF_INET; 1337 sock.sin_port = sep->se_ctrladdr6.sin6_port; 1338 } 1339 } 1340 if (debug) 1341 print_service("REG ", sep); 1342 for (i = sep->se_rpc_lowvers; i <= sep->se_rpc_highvers; i++) { 1343 rpcb_unset(sep->se_rpc_prog, i, netid); 1344 rpcb_set(sep->se_rpc_prog, i, netid, &nbuf); 1345 if (netid2) { 1346 rpcb_unset(sep->se_rpc_prog, i, netid2); 1347 rpcb_set(sep->se_rpc_prog, i, netid2, &nbuf2); 1348 } 1349 } 1350 } 1351 if (sep->se_socktype == SOCK_STREAM) 1352 listen(sep->se_fd, 64); 1353 enable(sep); 1354 if (debug) { 1355 warnx("registered %s on %d", 1356 sep->se_server, sep->se_fd); 1357 } 1358 } 1359 1360 #ifdef IPSEC 1361 void 1362 ipsecsetup(sep) 1363 struct servtab *sep; 1364 { 1365 char *buf; 1366 char *policy_in = NULL; 1367 char *policy_out = NULL; 1368 int level; 1369 int opt; 1370 1371 switch (sep->se_family) { 1372 case AF_INET: 1373 level = IPPROTO_IP; 1374 opt = IP_IPSEC_POLICY; 1375 break; 1376 #ifdef INET6 1377 case AF_INET6: 1378 level = IPPROTO_IPV6; 1379 opt = IPV6_IPSEC_POLICY; 1380 break; 1381 #endif 1382 default: 1383 return; 1384 } 1385 1386 if (!sep->se_policy || sep->se_policy[0] == '\0') { 1387 static char def_in[] = "in entrust", def_out[] = "out entrust"; 1388 policy_in = def_in; 1389 policy_out = def_out; 1390 } else { 1391 if (!strncmp("in", sep->se_policy, 2)) 1392 policy_in = sep->se_policy; 1393 else if (!strncmp("out", sep->se_policy, 3)) 1394 policy_out = sep->se_policy; 1395 else { 1396 syslog(LOG_ERR, "invalid security policy \"%s\"", 1397 sep->se_policy); 1398 return; 1399 } 1400 } 1401 1402 if (policy_in != NULL) { 1403 buf = ipsec_set_policy(policy_in, strlen(policy_in)); 1404 if (buf != NULL) { 1405 if (setsockopt(sep->se_fd, level, opt, 1406 buf, ipsec_get_policylen(buf)) < 0 && 1407 debug != 0) 1408 warnx("%s/%s: ipsec initialization failed; %s", 1409 sep->se_service, sep->se_proto, 1410 policy_in); 1411 free(buf); 1412 } else 1413 syslog(LOG_ERR, "invalid security policy \"%s\"", 1414 policy_in); 1415 } 1416 if (policy_out != NULL) { 1417 buf = ipsec_set_policy(policy_out, strlen(policy_out)); 1418 if (buf != NULL) { 1419 if (setsockopt(sep->se_fd, level, opt, 1420 buf, ipsec_get_policylen(buf)) < 0 && 1421 debug != 0) 1422 warnx("%s/%s: ipsec initialization failed; %s", 1423 sep->se_service, sep->se_proto, 1424 policy_out); 1425 free(buf); 1426 } else 1427 syslog(LOG_ERR, "invalid security policy \"%s\"", 1428 policy_out); 1429 } 1430 } 1431 #endif 1432 1433 /* 1434 * Finish with a service and its socket. 1435 */ 1436 void 1437 close_sep(struct servtab *sep) 1438 { 1439 if (sep->se_fd >= 0) { 1440 if (FD_ISSET(sep->se_fd, &allsock)) 1441 disable(sep); 1442 (void) close(sep->se_fd); 1443 sep->se_fd = -1; 1444 } 1445 sep->se_count = 0; 1446 sep->se_numchild = 0; /* forget about any existing children */ 1447 } 1448 1449 int 1450 matchservent(const char *name1, const char *name2, const char *proto) 1451 { 1452 char **alias, *p; 1453 struct servent *se; 1454 1455 if (strcmp(proto, "unix") == 0) { 1456 if ((p = strrchr(name1, '/')) != NULL) 1457 name1 = p + 1; 1458 if ((p = strrchr(name2, '/')) != NULL) 1459 name2 = p + 1; 1460 } 1461 if (strcmp(name1, name2) == 0) 1462 return(1); 1463 if ((se = getservbyname(name1, proto)) != NULL) { 1464 if (strcmp(name2, se->s_name) == 0) 1465 return(1); 1466 for (alias = se->s_aliases; *alias; alias++) 1467 if (strcmp(name2, *alias) == 0) 1468 return(1); 1469 } 1470 return(0); 1471 } 1472 1473 struct servtab * 1474 enter(struct servtab *cp) 1475 { 1476 struct servtab *sep; 1477 long omask; 1478 1479 sep = (struct servtab *)malloc(sizeof (*sep)); 1480 if (sep == (struct servtab *)0) { 1481 syslog(LOG_ERR, "malloc: %m"); 1482 exit(EX_OSERR); 1483 } 1484 *sep = *cp; 1485 sep->se_fd = -1; 1486 omask = sigblock(SIGBLOCK); 1487 sep->se_next = servtab; 1488 servtab = sep; 1489 sigsetmask(omask); 1490 return (sep); 1491 } 1492 1493 void 1494 enable(struct servtab *sep) 1495 { 1496 if (debug) 1497 warnx( 1498 "enabling %s, fd %d", sep->se_service, sep->se_fd); 1499 #ifdef SANITY_CHECK 1500 if (sep->se_fd < 0) { 1501 syslog(LOG_ERR, 1502 "%s: %s: bad fd", __FUNCTION__, sep->se_service); 1503 exit(EX_SOFTWARE); 1504 } 1505 if (ISMUX(sep)) { 1506 syslog(LOG_ERR, 1507 "%s: %s: is mux", __FUNCTION__, sep->se_service); 1508 exit(EX_SOFTWARE); 1509 } 1510 if (FD_ISSET(sep->se_fd, &allsock)) { 1511 syslog(LOG_ERR, 1512 "%s: %s: not off", __FUNCTION__, sep->se_service); 1513 exit(EX_SOFTWARE); 1514 } 1515 nsock++; 1516 #endif 1517 FD_SET(sep->se_fd, &allsock); 1518 if (sep->se_fd > maxsock) 1519 maxsock = sep->se_fd; 1520 } 1521 1522 void 1523 disable(struct servtab *sep) 1524 { 1525 if (debug) 1526 warnx( 1527 "disabling %s, fd %d", sep->se_service, sep->se_fd); 1528 #ifdef SANITY_CHECK 1529 if (sep->se_fd < 0) { 1530 syslog(LOG_ERR, 1531 "%s: %s: bad fd", __FUNCTION__, sep->se_service); 1532 exit(EX_SOFTWARE); 1533 } 1534 if (ISMUX(sep)) { 1535 syslog(LOG_ERR, 1536 "%s: %s: is mux", __FUNCTION__, sep->se_service); 1537 exit(EX_SOFTWARE); 1538 } 1539 if (!FD_ISSET(sep->se_fd, &allsock)) { 1540 syslog(LOG_ERR, 1541 "%s: %s: not on", __FUNCTION__, sep->se_service); 1542 exit(EX_SOFTWARE); 1543 } 1544 if (nsock == 0) { 1545 syslog(LOG_ERR, "%s: nsock=0", __FUNCTION__); 1546 exit(EX_SOFTWARE); 1547 } 1548 nsock--; 1549 #endif 1550 FD_CLR(sep->se_fd, &allsock); 1551 if (sep->se_fd == maxsock) 1552 maxsock--; 1553 } 1554 1555 FILE *fconfig = NULL; 1556 struct servtab serv; 1557 char line[LINE_MAX]; 1558 1559 int 1560 setconfig(void) 1561 { 1562 1563 if (fconfig != NULL) { 1564 fseek(fconfig, 0L, SEEK_SET); 1565 return (1); 1566 } 1567 fconfig = fopen(CONFIG, "r"); 1568 return (fconfig != NULL); 1569 } 1570 1571 void 1572 endconfig(void) 1573 { 1574 if (fconfig) { 1575 (void) fclose(fconfig); 1576 fconfig = NULL; 1577 } 1578 } 1579 1580 struct servtab * 1581 getconfigent(void) 1582 { 1583 struct servtab *sep = &serv; 1584 int argc; 1585 char *cp, *arg, *s; 1586 char *versp; 1587 static char TCPMUX_TOKEN[] = "tcpmux/"; 1588 #define MUX_LEN (sizeof(TCPMUX_TOKEN)-1) 1589 #ifdef IPSEC 1590 char *policy; 1591 #endif 1592 int v4bind; 1593 #ifdef INET6 1594 int v6bind; 1595 #endif 1596 int i; 1597 1598 #ifdef IPSEC 1599 policy = NULL; 1600 #endif 1601 more: 1602 v4bind = 0; 1603 #ifdef INET6 1604 v6bind = 0; 1605 #endif 1606 while ((cp = nextline(fconfig)) != NULL) { 1607 #ifdef IPSEC 1608 /* lines starting with #@ is not a comment, but the policy */ 1609 if (cp[0] == '#' && cp[1] == '@') { 1610 char *p; 1611 for (p = cp + 2; p && *p && isspace(*p); p++) 1612 ; 1613 if (*p == '\0') { 1614 if (policy) 1615 free(policy); 1616 policy = NULL; 1617 } else if (ipsec_get_policylen(p) >= 0) { 1618 if (policy) 1619 free(policy); 1620 policy = newstr(p); 1621 } else { 1622 syslog(LOG_ERR, 1623 "%s: invalid ipsec policy \"%s\"", 1624 CONFIG, p); 1625 exit(EX_CONFIG); 1626 } 1627 } 1628 #endif 1629 if (*cp == '#' || *cp == '\0') 1630 continue; 1631 break; 1632 } 1633 if (cp == NULL) 1634 return ((struct servtab *)0); 1635 /* 1636 * clear the static buffer, since some fields (se_ctrladdr, 1637 * for example) don't get initialized here. 1638 */ 1639 memset(sep, 0, sizeof *sep); 1640 arg = skip(&cp); 1641 if (cp == NULL) { 1642 /* got an empty line containing just blanks/tabs. */ 1643 goto more; 1644 } 1645 if (arg[0] == ':') { /* :user:group:perm: */ 1646 char *user, *group, *perm; 1647 struct passwd *pw; 1648 struct group *gr; 1649 user = arg+1; 1650 if ((group = strchr(user, ':')) == NULL) { 1651 syslog(LOG_ERR, "no group after user '%s'", user); 1652 goto more; 1653 } 1654 *group++ = '\0'; 1655 if ((perm = strchr(group, ':')) == NULL) { 1656 syslog(LOG_ERR, "no mode after group '%s'", group); 1657 goto more; 1658 } 1659 *perm++ = '\0'; 1660 if ((pw = getpwnam(user)) == NULL) { 1661 syslog(LOG_ERR, "no such user '%s'", user); 1662 goto more; 1663 } 1664 sep->se_sockuid = pw->pw_uid; 1665 if ((gr = getgrnam(group)) == NULL) { 1666 syslog(LOG_ERR, "no such user '%s'", group); 1667 goto more; 1668 } 1669 sep->se_sockgid = gr->gr_gid; 1670 sep->se_sockmode = strtol(perm, &arg, 8); 1671 if (*arg != ':') { 1672 syslog(LOG_ERR, "bad mode '%s'", perm); 1673 goto more; 1674 } 1675 *arg++ = '\0'; 1676 } else { 1677 sep->se_sockuid = euid; 1678 sep->se_sockgid = egid; 1679 sep->se_sockmode = 0200; 1680 } 1681 if (strncmp(arg, TCPMUX_TOKEN, MUX_LEN) == 0) { 1682 char *c = arg + MUX_LEN; 1683 if (*c == '+') { 1684 sep->se_type = MUXPLUS_TYPE; 1685 c++; 1686 } else 1687 sep->se_type = MUX_TYPE; 1688 sep->se_service = newstr(c); 1689 } else { 1690 sep->se_service = newstr(arg); 1691 sep->se_type = NORM_TYPE; 1692 } 1693 arg = sskip(&cp); 1694 if (strcmp(arg, "stream") == 0) 1695 sep->se_socktype = SOCK_STREAM; 1696 else if (strcmp(arg, "dgram") == 0) 1697 sep->se_socktype = SOCK_DGRAM; 1698 else if (strcmp(arg, "rdm") == 0) 1699 sep->se_socktype = SOCK_RDM; 1700 else if (strcmp(arg, "seqpacket") == 0) 1701 sep->se_socktype = SOCK_SEQPACKET; 1702 else if (strcmp(arg, "raw") == 0) 1703 sep->se_socktype = SOCK_RAW; 1704 else 1705 sep->se_socktype = -1; 1706 1707 arg = sskip(&cp); 1708 if (strncmp(arg, "tcp", 3) == 0) { 1709 sep->se_proto = newstr(strsep(&arg, "/")); 1710 if (arg != NULL) { 1711 if (strcmp(arg, "ttcp") == 0) 1712 sep->se_type = TTCP_TYPE; 1713 else if (strcmp(arg, "faith") == 0) 1714 sep->se_type = FAITH_TYPE; 1715 } 1716 } else { 1717 if (sep->se_type == NORM_TYPE && 1718 strncmp(arg, "faith/", 6) == 0) { 1719 arg += 6; 1720 sep->se_type = FAITH_TYPE; 1721 } 1722 sep->se_proto = newstr(arg); 1723 } 1724 if (strncmp(sep->se_proto, "rpc/", 4) == 0) { 1725 memmove(sep->se_proto, sep->se_proto + 4, 1726 strlen(sep->se_proto) + 1 - 4); 1727 sep->se_rpc = 1; 1728 sep->se_rpc_prog = sep->se_rpc_lowvers = 1729 sep->se_rpc_lowvers = 0; 1730 memcpy(&sep->se_ctrladdr4, bind_sa4, 1731 sizeof(sep->se_ctrladdr4)); 1732 if ((versp = rindex(sep->se_service, '/'))) { 1733 *versp++ = '\0'; 1734 switch (sscanf(versp, "%u-%u", 1735 &sep->se_rpc_lowvers, 1736 &sep->se_rpc_highvers)) { 1737 case 2: 1738 break; 1739 case 1: 1740 sep->se_rpc_highvers = 1741 sep->se_rpc_lowvers; 1742 break; 1743 default: 1744 syslog(LOG_ERR, 1745 "bad RPC version specifier; %s", 1746 sep->se_service); 1747 freeconfig(sep); 1748 goto more; 1749 } 1750 } 1751 else { 1752 sep->se_rpc_lowvers = 1753 sep->se_rpc_highvers = 1; 1754 } 1755 } 1756 sep->se_nomapped = 0; 1757 if (strcmp(sep->se_proto, "unix") == 0) { 1758 sep->se_family = AF_UNIX; 1759 } else { 1760 while (isdigit(sep->se_proto[strlen(sep->se_proto) - 1])) { 1761 #ifdef INET6 1762 if (sep->se_proto[strlen(sep->se_proto) - 1] == '6') { 1763 sep->se_proto[strlen(sep->se_proto) - 1] = '\0'; 1764 v6bind = 1; 1765 continue; 1766 } 1767 #endif 1768 if (sep->se_proto[strlen(sep->se_proto) - 1] == '4') { 1769 sep->se_proto[strlen(sep->se_proto) - 1] = '\0'; 1770 v4bind = 1; 1771 continue; 1772 } 1773 /* illegal version num */ 1774 syslog(LOG_ERR, "bad IP version for %s", sep->se_proto); 1775 freeconfig(sep); 1776 goto more; 1777 } 1778 #ifdef INET6 1779 if (v6bind && !v6bind_ok) { 1780 syslog(LOG_INFO, "IPv6 bind is ignored for %s", 1781 sep->se_service); 1782 if (v4bind && v4bind_ok) 1783 v6bind = 0; 1784 else { 1785 freeconfig(sep); 1786 goto more; 1787 } 1788 } 1789 if (v6bind) { 1790 sep->se_family = AF_INET6; 1791 if (!v4bind || !v4bind_ok) 1792 sep->se_nomapped = 1; 1793 } else 1794 #endif 1795 { /* default to v4 bind if not v6 bind */ 1796 if (!v4bind_ok) { 1797 syslog(LOG_NOTICE, "IPv4 bind is ignored for %s", 1798 sep->se_service); 1799 freeconfig(sep); 1800 goto more; 1801 } 1802 sep->se_family = AF_INET; 1803 } 1804 } 1805 /* init ctladdr */ 1806 switch(sep->se_family) { 1807 case AF_INET: 1808 memcpy(&sep->se_ctrladdr4, bind_sa4, 1809 sizeof(sep->se_ctrladdr4)); 1810 sep->se_ctrladdr_size = sizeof(sep->se_ctrladdr4); 1811 break; 1812 #ifdef INET6 1813 case AF_INET6: 1814 memcpy(&sep->se_ctrladdr6, bind_sa6, 1815 sizeof(sep->se_ctrladdr6)); 1816 sep->se_ctrladdr_size = sizeof(sep->se_ctrladdr6); 1817 break; 1818 #endif 1819 case AF_UNIX: 1820 if (strlen(sep->se_service) >= sizeof(sep->se_ctrladdr_un.sun_path)) { 1821 syslog(LOG_ERR, 1822 "domain socket pathname too long for service %s", 1823 sep->se_service); 1824 goto more; 1825 } 1826 memset(&sep->se_ctrladdr, 0, sizeof(sep->se_ctrladdr)); 1827 sep->se_ctrladdr_un.sun_family = sep->se_family; 1828 sep->se_ctrladdr_un.sun_len = strlen(sep->se_service); 1829 strcpy(sep->se_ctrladdr_un.sun_path, sep->se_service); 1830 sep->se_ctrladdr_size = SUN_LEN(&sep->se_ctrladdr_un); 1831 } 1832 arg = sskip(&cp); 1833 if (!strncmp(arg, "wait", 4)) 1834 sep->se_accept = 0; 1835 else if (!strncmp(arg, "nowait", 6)) 1836 sep->se_accept = 1; 1837 else { 1838 syslog(LOG_ERR, 1839 "%s: bad wait/nowait for service %s", 1840 CONFIG, sep->se_service); 1841 goto more; 1842 } 1843 sep->se_maxchild = -1; 1844 sep->se_maxcpm = -1; 1845 sep->se_maxperip = -1; 1846 if ((s = strchr(arg, '/')) != NULL) { 1847 char *eptr; 1848 u_long val; 1849 1850 val = strtoul(s + 1, &eptr, 10); 1851 if (eptr == s + 1 || val > MAX_MAXCHLD) { 1852 syslog(LOG_ERR, 1853 "%s: bad max-child for service %s", 1854 CONFIG, sep->se_service); 1855 goto more; 1856 } 1857 if (debug) 1858 if (!sep->se_accept && val != 1) 1859 warnx("maxchild=%lu for wait service %s" 1860 " not recommended", val, sep->se_service); 1861 sep->se_maxchild = val; 1862 if (*eptr == '/') 1863 sep->se_maxcpm = strtol(eptr + 1, &eptr, 10); 1864 if (*eptr == '/') 1865 sep->se_maxperip = strtol(eptr + 1, &eptr, 10); 1866 /* 1867 * explicitly do not check for \0 for future expansion / 1868 * backwards compatibility 1869 */ 1870 } 1871 if (ISMUX(sep)) { 1872 /* 1873 * Silently enforce "nowait" mode for TCPMUX services 1874 * since they don't have an assigned port to listen on. 1875 */ 1876 sep->se_accept = 1; 1877 if (strcmp(sep->se_proto, "tcp")) { 1878 syslog(LOG_ERR, 1879 "%s: bad protocol for tcpmux service %s", 1880 CONFIG, sep->se_service); 1881 goto more; 1882 } 1883 if (sep->se_socktype != SOCK_STREAM) { 1884 syslog(LOG_ERR, 1885 "%s: bad socket type for tcpmux service %s", 1886 CONFIG, sep->se_service); 1887 goto more; 1888 } 1889 } 1890 sep->se_user = newstr(sskip(&cp)); 1891 #ifdef LOGIN_CAP 1892 if ((s = strrchr(sep->se_user, '/')) != NULL) { 1893 *s = '\0'; 1894 sep->se_class = newstr(s + 1); 1895 } else 1896 sep->se_class = newstr(RESOURCE_RC); 1897 #endif 1898 if ((s = strrchr(sep->se_user, ':')) != NULL) { 1899 *s = '\0'; 1900 sep->se_group = newstr(s + 1); 1901 } else 1902 sep->se_group = NULL; 1903 sep->se_server = newstr(sskip(&cp)); 1904 if ((sep->se_server_name = rindex(sep->se_server, '/'))) 1905 sep->se_server_name++; 1906 if (strcmp(sep->se_server, "internal") == 0) { 1907 struct biltin *bi; 1908 1909 for (bi = biltins; bi->bi_service; bi++) 1910 if (bi->bi_socktype == sep->se_socktype && 1911 matchservent(bi->bi_service, sep->se_service, 1912 sep->se_proto)) 1913 break; 1914 if (bi->bi_service == 0) { 1915 syslog(LOG_ERR, "internal service %s unknown", 1916 sep->se_service); 1917 goto more; 1918 } 1919 sep->se_accept = 1; /* force accept mode for built-ins */ 1920 sep->se_bi = bi; 1921 } else 1922 sep->se_bi = NULL; 1923 if (sep->se_maxperip < 0) 1924 sep->se_maxperip = maxperip; 1925 if (sep->se_maxcpm < 0) 1926 sep->se_maxcpm = maxcpm; 1927 if (sep->se_maxchild < 0) { /* apply default max-children */ 1928 if (sep->se_bi && sep->se_bi->bi_maxchild >= 0) 1929 sep->se_maxchild = sep->se_bi->bi_maxchild; 1930 else if (sep->se_accept) 1931 sep->se_maxchild = maxchild > 0 ? maxchild : 0; 1932 else 1933 sep->se_maxchild = 1; 1934 } 1935 if (sep->se_maxchild > 0) { 1936 sep->se_pids = malloc(sep->se_maxchild * sizeof(*sep->se_pids)); 1937 if (sep->se_pids == NULL) { 1938 syslog(LOG_ERR, "malloc: %m"); 1939 exit(EX_OSERR); 1940 } 1941 } 1942 argc = 0; 1943 for (arg = skip(&cp); cp; arg = skip(&cp)) 1944 if (argc < MAXARGV) { 1945 sep->se_argv[argc++] = newstr(arg); 1946 } else { 1947 syslog(LOG_ERR, 1948 "%s: too many arguments for service %s", 1949 CONFIG, sep->se_service); 1950 goto more; 1951 } 1952 while (argc <= MAXARGV) 1953 sep->se_argv[argc++] = NULL; 1954 for (i = 0; i < PERIPSIZE; ++i) 1955 LIST_INIT(&sep->se_conn[i]); 1956 #ifdef IPSEC 1957 sep->se_policy = policy ? newstr(policy) : NULL; 1958 #endif 1959 return (sep); 1960 } 1961 1962 void 1963 freeconfig(struct servtab *cp) 1964 { 1965 int i; 1966 1967 if (cp->se_service) 1968 free(cp->se_service); 1969 if (cp->se_proto) 1970 free(cp->se_proto); 1971 if (cp->se_user) 1972 free(cp->se_user); 1973 if (cp->se_group) 1974 free(cp->se_group); 1975 #ifdef LOGIN_CAP 1976 if (cp->se_class) 1977 free(cp->se_class); 1978 #endif 1979 if (cp->se_server) 1980 free(cp->se_server); 1981 if (cp->se_pids) 1982 free(cp->se_pids); 1983 for (i = 0; i < MAXARGV; i++) 1984 if (cp->se_argv[i]) 1985 free(cp->se_argv[i]); 1986 free_connlist(cp); 1987 #ifdef IPSEC 1988 if (cp->se_policy) 1989 free(cp->se_policy); 1990 #endif 1991 } 1992 1993 1994 /* 1995 * Safe skip - if skip returns null, log a syntax error in the 1996 * configuration file and exit. 1997 */ 1998 char * 1999 sskip(char **cpp) 2000 { 2001 char *cp; 2002 2003 cp = skip(cpp); 2004 if (cp == NULL) { 2005 syslog(LOG_ERR, "%s: syntax error", CONFIG); 2006 exit(EX_DATAERR); 2007 } 2008 return (cp); 2009 } 2010 2011 char * 2012 skip(char **cpp) 2013 { 2014 char *cp = *cpp; 2015 char *start; 2016 char quote = '\0'; 2017 2018 again: 2019 while (*cp == ' ' || *cp == '\t') 2020 cp++; 2021 if (*cp == '\0') { 2022 int c; 2023 2024 c = getc(fconfig); 2025 (void) ungetc(c, fconfig); 2026 if (c == ' ' || c == '\t') 2027 if ((cp = nextline(fconfig))) 2028 goto again; 2029 *cpp = (char *)0; 2030 return ((char *)0); 2031 } 2032 if (*cp == '"' || *cp == '\'') 2033 quote = *cp++; 2034 start = cp; 2035 if (quote) 2036 while (*cp && *cp != quote) 2037 cp++; 2038 else 2039 while (*cp && *cp != ' ' && *cp != '\t') 2040 cp++; 2041 if (*cp != '\0') 2042 *cp++ = '\0'; 2043 *cpp = cp; 2044 return (start); 2045 } 2046 2047 char * 2048 nextline(FILE *fd) 2049 { 2050 char *cp; 2051 2052 if (fgets(line, sizeof (line), fd) == NULL) 2053 return ((char *)0); 2054 cp = strchr(line, '\n'); 2055 if (cp) 2056 *cp = '\0'; 2057 return (line); 2058 } 2059 2060 char * 2061 newstr(const char *cp) 2062 { 2063 char *cr; 2064 2065 if ((cr = strdup(cp != NULL ? cp : ""))) 2066 return (cr); 2067 syslog(LOG_ERR, "strdup: %m"); 2068 exit(EX_OSERR); 2069 } 2070 2071 void 2072 inetd_setproctitle(const char *a, int s) 2073 { 2074 socklen_t size; 2075 struct sockaddr_storage ss; 2076 char buf[80], pbuf[INET6_ADDRSTRLEN]; 2077 2078 size = sizeof(ss); 2079 if (getpeername(s, (struct sockaddr *)&ss, &size) == 0) { 2080 getnameinfo((struct sockaddr *)&ss, size, pbuf, sizeof(pbuf), 2081 NULL, 0, NI_NUMERICHOST|NI_WITHSCOPEID); 2082 (void) sprintf(buf, "%s [%s]", a, pbuf); 2083 } else 2084 (void) sprintf(buf, "%s", a); 2085 setproctitle("%s", buf); 2086 } 2087 2088 int 2089 check_loop(const struct sockaddr *sa, const struct servtab *sep) 2090 { 2091 struct servtab *se2; 2092 char pname[INET6_ADDRSTRLEN]; 2093 2094 for (se2 = servtab; se2; se2 = se2->se_next) { 2095 if (!se2->se_bi || se2->se_socktype != SOCK_DGRAM) 2096 continue; 2097 2098 switch (se2->se_family) { 2099 case AF_INET: 2100 if (((const struct sockaddr_in *)sa)->sin_port == 2101 se2->se_ctrladdr4.sin_port) 2102 goto isloop; 2103 continue; 2104 #ifdef INET6 2105 case AF_INET6: 2106 if (((const struct sockaddr_in *)sa)->sin_port == 2107 se2->se_ctrladdr4.sin_port) 2108 goto isloop; 2109 continue; 2110 #endif 2111 default: 2112 continue; 2113 } 2114 isloop: 2115 getnameinfo(sa, sa->sa_len, pname, sizeof(pname), NULL, 0, 2116 NI_NUMERICHOST|NI_WITHSCOPEID); 2117 syslog(LOG_WARNING, "%s/%s:%s/%s loop request REFUSED from %s", 2118 sep->se_service, sep->se_proto, 2119 se2->se_service, se2->se_proto, 2120 pname); 2121 return 1; 2122 } 2123 return 0; 2124 } 2125 2126 /* 2127 * print_service: 2128 * Dump relevant information to stderr 2129 */ 2130 void 2131 print_service(const char *action, const struct servtab *sep) 2132 { 2133 fprintf(stderr, 2134 "%s: %s proto=%s accept=%d max=%d user=%s group=%s" 2135 #ifdef LOGIN_CAP 2136 "class=%s" 2137 #endif 2138 " builtin=%p server=%s" 2139 #ifdef IPSEC 2140 " policy=\"%s\"" 2141 #endif 2142 "\n", 2143 action, sep->se_service, sep->se_proto, 2144 sep->se_accept, sep->se_maxchild, sep->se_user, sep->se_group, 2145 #ifdef LOGIN_CAP 2146 sep->se_class, 2147 #endif 2148 (void *) sep->se_bi, sep->se_server 2149 #ifdef IPSEC 2150 , (sep->se_policy ? sep->se_policy : "") 2151 #endif 2152 ); 2153 } 2154 2155 #define CPMHSIZE 256 2156 #define CPMHMASK (CPMHSIZE-1) 2157 #define CHTGRAN 10 2158 #define CHTSIZE 6 2159 2160 typedef struct CTime { 2161 unsigned long ct_Ticks; 2162 int ct_Count; 2163 } CTime; 2164 2165 typedef struct CHash { 2166 union { 2167 struct in_addr c4_Addr; 2168 struct in6_addr c6_Addr; 2169 } cu_Addr; 2170 #define ch_Addr4 cu_Addr.c4_Addr 2171 #define ch_Addr6 cu_Addr.c6_Addr 2172 int ch_Family; 2173 time_t ch_LTime; 2174 char *ch_Service; 2175 CTime ch_Times[CHTSIZE]; 2176 } CHash; 2177 2178 CHash CHashAry[CPMHSIZE]; 2179 2180 int 2181 cpmip(const struct servtab *sep, int ctrl) 2182 { 2183 struct sockaddr_storage rss; 2184 socklen_t rssLen = sizeof(rss); 2185 int r = 0; 2186 2187 /* 2188 * If getpeername() fails, just let it through (if logging is 2189 * enabled the condition is caught elsewhere) 2190 */ 2191 2192 if (sep->se_maxcpm > 0 && 2193 getpeername(ctrl, (struct sockaddr *)&rss, &rssLen) == 0 ) { 2194 time_t t = time(NULL); 2195 int hv = 0xABC3D20F; 2196 int i; 2197 int cnt = 0; 2198 CHash *chBest = NULL; 2199 unsigned int ticks = t / CHTGRAN; 2200 struct sockaddr_in *sin4; 2201 #ifdef INET6 2202 struct sockaddr_in6 *sin6; 2203 #endif 2204 2205 sin4 = (struct sockaddr_in *)&rss; 2206 #ifdef INET6 2207 sin6 = (struct sockaddr_in6 *)&rss; 2208 #endif 2209 { 2210 char *p; 2211 int addrlen; 2212 2213 switch (rss.ss_family) { 2214 case AF_INET: 2215 p = (char *)&sin4->sin_addr; 2216 addrlen = sizeof(struct in_addr); 2217 break; 2218 #ifdef INET6 2219 case AF_INET6: 2220 p = (char *)&sin6->sin6_addr; 2221 addrlen = sizeof(struct in6_addr); 2222 break; 2223 #endif 2224 default: 2225 /* should not happen */ 2226 return -1; 2227 } 2228 2229 for (i = 0; i < addrlen; ++i, ++p) { 2230 hv = (hv << 5) ^ (hv >> 23) ^ *p; 2231 } 2232 hv = (hv ^ (hv >> 16)); 2233 } 2234 for (i = 0; i < 5; ++i) { 2235 CHash *ch = &CHashAry[(hv + i) & CPMHMASK]; 2236 2237 if (rss.ss_family == AF_INET && 2238 ch->ch_Family == AF_INET && 2239 sin4->sin_addr.s_addr == ch->ch_Addr4.s_addr && 2240 ch->ch_Service && strcmp(sep->se_service, 2241 ch->ch_Service) == 0) { 2242 chBest = ch; 2243 break; 2244 } 2245 #ifdef INET6 2246 if (rss.ss_family == AF_INET6 && 2247 ch->ch_Family == AF_INET6 && 2248 IN6_ARE_ADDR_EQUAL(&sin6->sin6_addr, 2249 &ch->ch_Addr6) != 0 && 2250 ch->ch_Service && strcmp(sep->se_service, 2251 ch->ch_Service) == 0) { 2252 chBest = ch; 2253 break; 2254 } 2255 #endif 2256 if (chBest == NULL || ch->ch_LTime == 0 || 2257 ch->ch_LTime < chBest->ch_LTime) { 2258 chBest = ch; 2259 } 2260 } 2261 if ((rss.ss_family == AF_INET && 2262 (chBest->ch_Family != AF_INET || 2263 sin4->sin_addr.s_addr != chBest->ch_Addr4.s_addr)) || 2264 chBest->ch_Service == NULL || 2265 strcmp(sep->se_service, chBest->ch_Service) != 0) { 2266 chBest->ch_Family = sin4->sin_family; 2267 chBest->ch_Addr4 = sin4->sin_addr; 2268 if (chBest->ch_Service) 2269 free(chBest->ch_Service); 2270 chBest->ch_Service = strdup(sep->se_service); 2271 bzero(chBest->ch_Times, sizeof(chBest->ch_Times)); 2272 } 2273 #ifdef INET6 2274 if ((rss.ss_family == AF_INET6 && 2275 (chBest->ch_Family != AF_INET6 || 2276 IN6_ARE_ADDR_EQUAL(&sin6->sin6_addr, 2277 &chBest->ch_Addr6) == 0)) || 2278 chBest->ch_Service == NULL || 2279 strcmp(sep->se_service, chBest->ch_Service) != 0) { 2280 chBest->ch_Family = sin6->sin6_family; 2281 chBest->ch_Addr6 = sin6->sin6_addr; 2282 if (chBest->ch_Service) 2283 free(chBest->ch_Service); 2284 chBest->ch_Service = strdup(sep->se_service); 2285 bzero(chBest->ch_Times, sizeof(chBest->ch_Times)); 2286 } 2287 #endif 2288 chBest->ch_LTime = t; 2289 { 2290 CTime *ct = &chBest->ch_Times[ticks % CHTSIZE]; 2291 if (ct->ct_Ticks != ticks) { 2292 ct->ct_Ticks = ticks; 2293 ct->ct_Count = 0; 2294 } 2295 ++ct->ct_Count; 2296 } 2297 for (i = 0; i < CHTSIZE; ++i) { 2298 CTime *ct = &chBest->ch_Times[i]; 2299 if (ct->ct_Ticks <= ticks && 2300 ct->ct_Ticks >= ticks - CHTSIZE) { 2301 cnt += ct->ct_Count; 2302 } 2303 } 2304 if (cnt * (CHTSIZE * CHTGRAN) / 60 > sep->se_maxcpm) { 2305 char pname[INET6_ADDRSTRLEN]; 2306 2307 getnameinfo((struct sockaddr *)&rss, 2308 ((struct sockaddr *)&rss)->sa_len, 2309 pname, sizeof(pname), NULL, 0, 2310 NI_NUMERICHOST|NI_WITHSCOPEID); 2311 r = -1; 2312 syslog(LOG_ERR, 2313 "%s from %s exceeded counts/min (limit %d/min)", 2314 sep->se_service, pname, 2315 sep->se_maxcpm); 2316 } 2317 } 2318 return(r); 2319 } 2320 2321 static struct conninfo * 2322 search_conn(struct servtab *sep, int ctrl) 2323 { 2324 struct sockaddr_storage ss; 2325 socklen_t sslen = sizeof(ss); 2326 struct conninfo *conn; 2327 int hv; 2328 char pname[NI_MAXHOST], pname2[NI_MAXHOST]; 2329 2330 if (sep->se_maxperip <= 0) 2331 return NULL; 2332 2333 /* 2334 * If getpeername() fails, just let it through (if logging is 2335 * enabled the condition is caught elsewhere) 2336 */ 2337 if (getpeername(ctrl, (struct sockaddr *)&ss, &sslen) != 0) 2338 return NULL; 2339 2340 switch (ss.ss_family) { 2341 case AF_INET: 2342 hv = hashval((char *)&((struct sockaddr_in *)&ss)->sin_addr, 2343 sizeof(struct in_addr)); 2344 break; 2345 #ifdef INET6 2346 case AF_INET6: 2347 hv = hashval((char *)&((struct sockaddr_in6 *)&ss)->sin6_addr, 2348 sizeof(struct in6_addr)); 2349 break; 2350 #endif 2351 default: 2352 /* 2353 * Since we only support AF_INET and AF_INET6, just 2354 * let other than AF_INET and AF_INET6 through. 2355 */ 2356 return NULL; 2357 } 2358 2359 if (getnameinfo((struct sockaddr *)&ss, sslen, pname, sizeof(pname), 2360 NULL, 0, NI_NUMERICHOST | NI_WITHSCOPEID) != 0) 2361 return NULL; 2362 2363 LIST_FOREACH(conn, &sep->se_conn[hv], co_link) { 2364 if (getnameinfo((struct sockaddr *)&conn->co_addr, 2365 conn->co_addr.ss_len, pname2, sizeof(pname2), NULL, 0, 2366 NI_NUMERICHOST | NI_WITHSCOPEID) == 0 && 2367 strcmp(pname, pname2) == 0) 2368 break; 2369 } 2370 2371 if (conn == NULL) { 2372 if ((conn = malloc(sizeof(struct conninfo))) == NULL) { 2373 syslog(LOG_ERR, "malloc: %m"); 2374 exit(EX_OSERR); 2375 } 2376 conn->co_proc = malloc(sep->se_maxperip * sizeof(*conn->co_proc)); 2377 if (conn->co_proc == NULL) { 2378 syslog(LOG_ERR, "malloc: %m"); 2379 exit(EX_OSERR); 2380 } 2381 memcpy(&conn->co_addr, (struct sockaddr *)&ss, sslen); 2382 conn->co_numchild = 0; 2383 LIST_INSERT_HEAD(&sep->se_conn[hv], conn, co_link); 2384 } 2385 2386 /* 2387 * Since a child process is not invoked yet, we cannot 2388 * determine a pid of a child. So, co_proc and co_numchild 2389 * should be filled leter. 2390 */ 2391 2392 return conn; 2393 } 2394 2395 static int 2396 room_conn(struct servtab *sep, struct conninfo *conn) 2397 { 2398 char pname[NI_MAXHOST]; 2399 2400 if (conn->co_numchild >= sep->se_maxperip) { 2401 getnameinfo((struct sockaddr *)&conn->co_addr, 2402 conn->co_addr.ss_len, pname, sizeof(pname), NULL, 0, 2403 NI_NUMERICHOST | NI_WITHSCOPEID); 2404 syslog(LOG_ERR, "%s from %s exceeded counts (limit %d)", 2405 sep->se_service, pname, sep->se_maxperip); 2406 return 0; 2407 } 2408 return 1; 2409 } 2410 2411 static void 2412 addchild_conn(struct conninfo *conn, pid_t pid) 2413 { 2414 struct procinfo *proc; 2415 2416 if (conn == NULL) 2417 return; 2418 2419 if ((proc = search_proc(pid, 1)) != NULL) { 2420 if (proc->pr_conn != NULL) { 2421 syslog(LOG_ERR, 2422 "addchild_conn: child already on process list"); 2423 exit(EX_OSERR); 2424 } 2425 proc->pr_conn = conn; 2426 } 2427 2428 conn->co_proc[conn->co_numchild++] = proc; 2429 } 2430 2431 static void 2432 reapchild_conn(pid_t pid) 2433 { 2434 struct procinfo *proc; 2435 struct conninfo *conn; 2436 int i; 2437 2438 if ((proc = search_proc(pid, 0)) == NULL) 2439 return; 2440 if ((conn = proc->pr_conn) == NULL) 2441 return; 2442 for (i = 0; i < conn->co_numchild; ++i) 2443 if (conn->co_proc[i] == proc) { 2444 conn->co_proc[i] = conn->co_proc[--conn->co_numchild]; 2445 break; 2446 } 2447 free_proc(proc); 2448 free_conn(conn); 2449 } 2450 2451 static void 2452 resize_conn(struct servtab *sep, int maxpip) 2453 { 2454 struct conninfo *conn; 2455 int i, j; 2456 2457 if (sep->se_maxperip <= 0) 2458 return; 2459 if (maxpip <= 0) { 2460 free_connlist(sep); 2461 return; 2462 } 2463 for (i = 0; i < PERIPSIZE; ++i) { 2464 LIST_FOREACH(conn, &sep->se_conn[i], co_link) { 2465 for (j = maxpip; j < conn->co_numchild; ++j) 2466 free_proc(conn->co_proc[j]); 2467 conn->co_proc = realloc(conn->co_proc, 2468 maxpip * sizeof(*conn->co_proc)); 2469 if (conn->co_proc == NULL) { 2470 syslog(LOG_ERR, "realloc: %m"); 2471 exit(EX_OSERR); 2472 } 2473 if (conn->co_numchild > maxpip) 2474 conn->co_numchild = maxpip; 2475 } 2476 } 2477 } 2478 2479 static void 2480 free_connlist(struct servtab *sep) 2481 { 2482 struct conninfo *conn; 2483 int i, j; 2484 2485 for (i = 0; i < PERIPSIZE; ++i) { 2486 while ((conn = LIST_FIRST(&sep->se_conn[i])) != NULL) { 2487 for (j = 0; j < conn->co_numchild; ++j) 2488 free_proc(conn->co_proc[j]); 2489 conn->co_numchild = 0; 2490 free_conn(conn); 2491 } 2492 } 2493 } 2494 2495 static void 2496 free_conn(struct conninfo *conn) 2497 { 2498 if (conn == NULL) 2499 return; 2500 if (conn->co_numchild <= 0) { 2501 LIST_REMOVE(conn, co_link); 2502 free(conn->co_proc); 2503 free(conn); 2504 } 2505 } 2506 2507 static struct procinfo * 2508 search_proc(pid_t pid, int add) 2509 { 2510 struct procinfo *proc; 2511 int hv; 2512 2513 hv = hashval((char *)&pid, sizeof(pid)); 2514 LIST_FOREACH(proc, &proctable[hv], pr_link) { 2515 if (proc->pr_pid == pid) 2516 break; 2517 } 2518 if (proc == NULL && add) { 2519 if ((proc = malloc(sizeof(struct procinfo))) == NULL) { 2520 syslog(LOG_ERR, "malloc: %m"); 2521 exit(EX_OSERR); 2522 } 2523 proc->pr_pid = pid; 2524 proc->pr_conn = NULL; 2525 LIST_INSERT_HEAD(&proctable[hv], proc, pr_link); 2526 } 2527 return proc; 2528 } 2529 2530 static void 2531 free_proc(struct procinfo *proc) 2532 { 2533 if (proc == NULL) 2534 return; 2535 LIST_REMOVE(proc, pr_link); 2536 free(proc); 2537 } 2538 2539 static int 2540 hashval(char *p, int len) 2541 { 2542 int i, hv = 0xABC3D20F; 2543 2544 for (i = 0; i < len; ++i, ++p) 2545 hv = (hv << 5) ^ (hv >> 23) ^ *p; 2546 hv = (hv ^ (hv >> 16)) & (PERIPSIZE - 1); 2547 return hv; 2548 } 2549