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 30 #ifndef lint 31 static const char copyright[] = 32 "@(#) Copyright (c) 1983, 1991, 1993, 1994\n\ 33 The Regents of the University of California. All rights reserved.\n"; 34 #endif /* not lint */ 35 36 #ifndef lint 37 #if 0 38 static char sccsid[] = "@(#)from: inetd.c 8.4 (Berkeley) 4/13/94"; 39 #endif 40 #endif /* not lint */ 41 42 #include <sys/cdefs.h> 43 __FBSDID("$FreeBSD$"); 44 45 /* 46 * Inetd - Internet super-server 47 * 48 * This program invokes all internet services as needed. Connection-oriented 49 * services are invoked each time a connection is made, by creating a process. 50 * This process is passed the connection as file descriptor 0 and is expected 51 * to do a getpeername to find out the source host and port. 52 * 53 * Datagram oriented services are invoked when a datagram 54 * arrives; a process is created and passed a pending message 55 * on file descriptor 0. Datagram servers may either connect 56 * to their peer, freeing up the original socket for inetd 57 * to receive further messages on, or ``take over the socket'', 58 * processing all arriving datagrams and, eventually, timing 59 * out. The first type of server is said to be ``multi-threaded''; 60 * the second type of server ``single-threaded''. 61 * 62 * Inetd uses a configuration file which is read at startup 63 * and, possibly, at some later time in response to a hangup signal. 64 * The configuration file is ``free format'' with fields given in the 65 * order shown below. Continuation lines for an entry must begin with 66 * a space or tab. All fields must be present in each entry. 67 * 68 * service name must be in /etc/services 69 * or name a tcpmux service 70 * or specify a unix domain socket 71 * socket type stream/dgram/raw/rdm/seqpacket 72 * protocol tcp[4][6], udp[4][6], unix 73 * wait/nowait single-threaded/multi-threaded 74 * user[:group][/login-class] user/group/login-class to run daemon as 75 * server program full path name 76 * server program arguments maximum of MAXARGS (20) 77 * 78 * TCP services without official port numbers are handled with the 79 * RFC1078-based tcpmux internal service. Tcpmux listens on port 1 for 80 * requests. When a connection is made from a foreign host, the service 81 * requested is passed to tcpmux, which looks it up in the servtab list 82 * and returns the proper entry for the service. Tcpmux returns a 83 * negative reply if the service doesn't exist, otherwise the invoked 84 * server is expected to return the positive reply if the service type in 85 * inetd.conf file has the prefix "tcpmux/". If the service type has the 86 * prefix "tcpmux/+", tcpmux will return the positive reply for the 87 * process; this is for compatibility with older server code, and also 88 * allows you to invoke programs that use stdin/stdout without putting any 89 * special server code in them. Services that use tcpmux are "nowait" 90 * because they do not have a well-known port and hence cannot listen 91 * for new requests. 92 * 93 * For RPC services 94 * service name/version must be in /etc/rpc 95 * socket type stream/dgram/raw/rdm/seqpacket 96 * protocol rpc/tcp[4][6], rpc/udp[4][6] 97 * wait/nowait single-threaded/multi-threaded 98 * user[:group][/login-class] user/group/login-class to run daemon as 99 * server program full path name 100 * server program arguments maximum of MAXARGS 101 * 102 * Comment lines are indicated by a `#' in column 1. 103 * 104 * #ifdef IPSEC 105 * Comment lines that start with "#@" denote IPsec policy string, as described 106 * in ipsec_set_policy(3). This will affect all the following items in 107 * inetd.conf(8). To reset the policy, just use "#@" line. By default, 108 * there's no IPsec policy. 109 * #endif 110 */ 111 #include <sys/param.h> 112 #include <sys/ioctl.h> 113 #include <sys/mman.h> 114 #include <sys/wait.h> 115 #include <sys/time.h> 116 #include <sys/resource.h> 117 #include <sys/stat.h> 118 #include <sys/un.h> 119 120 #include <netinet/in.h> 121 #include <netinet/tcp.h> 122 #include <arpa/inet.h> 123 #include <rpc/rpc.h> 124 #include <rpc/pmap_clnt.h> 125 126 #include <ctype.h> 127 #include <errno.h> 128 #include <err.h> 129 #include <fcntl.h> 130 #include <grp.h> 131 #include <libutil.h> 132 #include <limits.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 <sysexits.h> 140 #include <syslog.h> 141 #ifdef LIBWRAP 142 #include <tcpd.h> 143 #endif 144 #include <unistd.h> 145 146 #include "inetd.h" 147 #include "pathnames.h" 148 149 #ifdef IPSEC 150 #include <netipsec/ipsec.h> 151 #ifndef IPSEC_POLICY_IPSEC /* no ipsec support on old ipsec */ 152 #undef IPSEC 153 #endif 154 #endif 155 156 #ifndef LIBWRAP_ALLOW_FACILITY 157 # define LIBWRAP_ALLOW_FACILITY LOG_AUTH 158 #endif 159 #ifndef LIBWRAP_ALLOW_SEVERITY 160 # define LIBWRAP_ALLOW_SEVERITY LOG_INFO 161 #endif 162 #ifndef LIBWRAP_DENY_FACILITY 163 # define LIBWRAP_DENY_FACILITY LOG_AUTH 164 #endif 165 #ifndef LIBWRAP_DENY_SEVERITY 166 # define LIBWRAP_DENY_SEVERITY LOG_WARNING 167 #endif 168 169 #define ISWRAP(sep) \ 170 ( ((wrap_ex && !(sep)->se_bi) || (wrap_bi && (sep)->se_bi)) \ 171 && (sep->se_family == AF_INET || sep->se_family == AF_INET6) \ 172 && ( ((sep)->se_accept && (sep)->se_socktype == SOCK_STREAM) \ 173 || (sep)->se_socktype == SOCK_DGRAM)) 174 175 #ifdef LOGIN_CAP 176 #include <login_cap.h> 177 178 /* see init.c */ 179 #define RESOURCE_RC "daemon" 180 181 #endif 182 183 #ifndef MAXCHILD 184 #define MAXCHILD -1 /* maximum number of this service 185 < 0 = no limit */ 186 #endif 187 188 #ifndef MAXCPM 189 #define MAXCPM -1 /* rate limit invocations from a 190 single remote address, 191 < 0 = no limit */ 192 #endif 193 194 #ifndef MAXPERIP 195 #define MAXPERIP -1 /* maximum number of this service 196 from a single remote address, 197 < 0 = no limit */ 198 #endif 199 200 #ifndef TOOMANY 201 #define TOOMANY 256 /* don't start more than TOOMANY */ 202 #endif 203 #define CNT_INTVL 60 /* servers in CNT_INTVL sec. */ 204 #define RETRYTIME (60*10) /* retry after bind or server fail */ 205 #define MAX_MAXCHLD 32767 /* max allowable max children */ 206 207 #define SIGBLOCK (sigmask(SIGCHLD)|sigmask(SIGHUP)|sigmask(SIGALRM)) 208 209 #define satosin(sa) ((struct sockaddr_in *)(void *)sa) 210 #define csatosin(sa) ((const struct sockaddr_in *)(const void *)sa) 211 #ifdef INET6 212 #define satosin6(sa) ((struct sockaddr_in6 *)(void *)sa) 213 #define csatosin6(sa) ((const struct sockaddr_in6 *)(const void *)sa) 214 #endif 215 static void close_sep(struct servtab *); 216 static void flag_signal(int); 217 static void flag_config(int); 218 static void config(void); 219 static int cpmip(const struct servtab *, int); 220 static void endconfig(void); 221 static struct servtab *enter(struct servtab *); 222 static void freeconfig(struct servtab *); 223 static struct servtab *getconfigent(void); 224 static int matchservent(const char *, const char *, const char *); 225 static char *nextline(FILE *); 226 static void addchild(struct servtab *, int); 227 static void flag_reapchild(int); 228 static void reapchild(void); 229 static void enable(struct servtab *); 230 static void disable(struct servtab *); 231 static void flag_retry(int); 232 static void retry(void); 233 static int setconfig(void); 234 static void setup(struct servtab *); 235 #ifdef IPSEC 236 static void ipsecsetup(struct servtab *); 237 #endif 238 static void unregisterrpc(register struct servtab *sep); 239 static struct conninfo *search_conn(struct servtab *sep, int ctrl); 240 static int room_conn(struct servtab *sep, struct conninfo *conn); 241 static void addchild_conn(struct conninfo *conn, pid_t pid); 242 static void reapchild_conn(pid_t pid); 243 static void free_conn(struct conninfo *conn); 244 static void resize_conn(struct servtab *sep, int maxperip); 245 static void free_connlist(struct servtab *sep); 246 static void free_proc(struct procinfo *); 247 static struct procinfo *search_proc(pid_t pid, int add); 248 static int hashval(char *p, int len); 249 static char *skip(char **); 250 static char *sskip(char **); 251 static char *newstr(const char *); 252 static void print_service(const char *, const struct servtab *); 253 254 /* tcpd.h */ 255 int allow_severity; 256 int deny_severity; 257 258 static int wrap_ex = 0; 259 static int wrap_bi = 0; 260 int debug = 0; 261 static int dolog = 0; 262 static int maxsock; /* highest-numbered descriptor */ 263 static fd_set allsock; 264 static int options; 265 static int timingout; 266 static int toomany = TOOMANY; 267 static int maxchild = MAXCHILD; 268 static int maxcpm = MAXCPM; 269 static int maxperip = MAXPERIP; 270 static struct servent *sp; 271 static struct rpcent *rpc; 272 static char *hostname = NULL; 273 static struct sockaddr_in *bind_sa4; 274 static int v4bind_ok = 0; 275 #ifdef INET6 276 static struct sockaddr_in6 *bind_sa6; 277 static int v6bind_ok = 0; 278 #endif 279 static int signalpipe[2]; 280 #ifdef SANITY_CHECK 281 static int nsock; 282 #endif 283 static uid_t euid; 284 static gid_t egid; 285 static mode_t mask; 286 287 struct servtab *servtab; 288 289 static const char *CONFIG = _PATH_INETDCONF; 290 static const char *pid_file = _PATH_INETDPID; 291 static struct pidfh *pfh = NULL; 292 293 static struct netconfig *udpconf, *tcpconf, *udp6conf, *tcp6conf; 294 295 static LIST_HEAD(, procinfo) proctable[PERIPSIZE]; 296 297 static int 298 getvalue(const char *arg, int *value, const char *whine) 299 { 300 int tmp; 301 char *p; 302 303 tmp = strtol(arg, &p, 0); 304 if (tmp < 0 || *p) { 305 syslog(LOG_ERR, whine, arg); 306 return 1; /* failure */ 307 } 308 *value = tmp; 309 return 0; /* success */ 310 } 311 312 #ifdef LIBWRAP 313 static sa_family_t 314 whichaf(struct request_info *req) 315 { 316 struct sockaddr *sa; 317 318 sa = (struct sockaddr *)req->client->sin; 319 if (sa == NULL) 320 return AF_UNSPEC; 321 #ifdef INET6 322 if (sa->sa_family == AF_INET6 && 323 IN6_IS_ADDR_V4MAPPED(&satosin6(sa)->sin6_addr)) 324 return AF_INET; 325 #endif 326 return sa->sa_family; 327 } 328 #endif 329 330 int 331 main(int argc, char **argv) 332 { 333 struct servtab *sep; 334 struct passwd *pwd; 335 struct group *grp; 336 struct sigaction sa, saalrm, sachld, sahup, sapipe; 337 int ch, dofork; 338 pid_t pid; 339 char buf[50]; 340 #ifdef LOGIN_CAP 341 login_cap_t *lc = NULL; 342 #endif 343 #ifdef LIBWRAP 344 struct request_info req; 345 int denied; 346 char *service = NULL; 347 #endif 348 struct sockaddr_storage peer; 349 int i; 350 struct addrinfo hints, *res; 351 const char *servname; 352 int error; 353 struct conninfo *conn; 354 355 openlog("inetd", LOG_PID | LOG_NOWAIT | LOG_PERROR, LOG_DAEMON); 356 357 while ((ch = getopt(argc, argv, "dlwWR:a:c:C:p:s:")) != -1) 358 switch(ch) { 359 case 'd': 360 debug = 1; 361 options |= SO_DEBUG; 362 break; 363 case 'l': 364 dolog = 1; 365 break; 366 case 'R': 367 getvalue(optarg, &toomany, 368 "-R %s: bad value for service invocation rate"); 369 break; 370 case 'c': 371 getvalue(optarg, &maxchild, 372 "-c %s: bad value for maximum children"); 373 break; 374 case 'C': 375 getvalue(optarg, &maxcpm, 376 "-C %s: bad value for maximum children/minute"); 377 break; 378 case 'a': 379 hostname = optarg; 380 break; 381 case 'p': 382 pid_file = optarg; 383 break; 384 case 's': 385 getvalue(optarg, &maxperip, 386 "-s %s: bad value for maximum children per source address"); 387 break; 388 case 'w': 389 wrap_ex++; 390 break; 391 case 'W': 392 wrap_bi++; 393 break; 394 case '?': 395 default: 396 syslog(LOG_ERR, 397 "usage: inetd [-dlwW] [-a address] [-R rate]" 398 " [-c maximum] [-C rate]" 399 " [-p pidfile] [conf-file]"); 400 exit(EX_USAGE); 401 } 402 /* 403 * Initialize Bind Addrs. 404 * When hostname is NULL, wild card bind addrs are obtained from 405 * getaddrinfo(). But getaddrinfo() requires at least one of 406 * hostname or servname is non NULL. 407 * So when hostname is NULL, set dummy value to servname. 408 * Since getaddrinfo() doesn't accept numeric servname, and 409 * we doesn't use ai_socktype of struct addrinfo returned 410 * from getaddrinfo(), we set dummy value to ai_socktype. 411 */ 412 servname = (hostname == NULL) ? "0" /* dummy */ : NULL; 413 414 bzero(&hints, sizeof(struct addrinfo)); 415 hints.ai_flags = AI_PASSIVE; 416 hints.ai_family = AF_UNSPEC; 417 hints.ai_socktype = SOCK_STREAM; /* dummy */ 418 error = getaddrinfo(hostname, servname, &hints, &res); 419 if (error != 0) { 420 syslog(LOG_ERR, "-a %s: %s", hostname, gai_strerror(error)); 421 if (error == EAI_SYSTEM) 422 syslog(LOG_ERR, "%s", strerror(errno)); 423 exit(EX_USAGE); 424 } 425 do { 426 if (res->ai_addr == NULL) { 427 syslog(LOG_ERR, "-a %s: getaddrinfo failed", hostname); 428 exit(EX_USAGE); 429 } 430 switch (res->ai_addr->sa_family) { 431 case AF_INET: 432 if (v4bind_ok) 433 continue; 434 bind_sa4 = satosin(res->ai_addr); 435 /* init port num in case servname is dummy */ 436 bind_sa4->sin_port = 0; 437 v4bind_ok = 1; 438 continue; 439 #ifdef INET6 440 case AF_INET6: 441 if (v6bind_ok) 442 continue; 443 bind_sa6 = satosin6(res->ai_addr); 444 /* init port num in case servname is dummy */ 445 bind_sa6->sin6_port = 0; 446 v6bind_ok = 1; 447 continue; 448 #endif 449 } 450 if (v4bind_ok 451 #ifdef INET6 452 && v6bind_ok 453 #endif 454 ) 455 break; 456 } while ((res = res->ai_next) != NULL); 457 if (!v4bind_ok 458 #ifdef INET6 459 && !v6bind_ok 460 #endif 461 ) { 462 syslog(LOG_ERR, "-a %s: unknown address family", hostname); 463 exit(EX_USAGE); 464 } 465 466 euid = geteuid(); 467 egid = getegid(); 468 umask(mask = umask(0777)); 469 470 argc -= optind; 471 argv += optind; 472 473 if (argc > 0) 474 CONFIG = argv[0]; 475 if (access(CONFIG, R_OK) < 0) 476 syslog(LOG_ERR, "Accessing %s: %m, continuing anyway.", CONFIG); 477 if (debug == 0) { 478 pid_t otherpid; 479 480 pfh = pidfile_open(pid_file, 0600, &otherpid); 481 if (pfh == NULL) { 482 if (errno == EEXIST) { 483 syslog(LOG_ERR, "%s already running, pid: %d", 484 getprogname(), otherpid); 485 exit(EX_OSERR); 486 } 487 syslog(LOG_WARNING, "pidfile_open() failed: %m"); 488 } 489 490 if (daemon(0, 0) < 0) { 491 syslog(LOG_WARNING, "daemon(0,0) failed: %m"); 492 } 493 /* From now on we don't want syslog messages going to stderr. */ 494 closelog(); 495 openlog("inetd", LOG_PID | LOG_NOWAIT, LOG_DAEMON); 496 /* 497 * In case somebody has started inetd manually, we need to 498 * clear the logname, so that old servers run as root do not 499 * get the user's logname.. 500 */ 501 if (setlogin("") < 0) { 502 syslog(LOG_WARNING, "cannot clear logname: %m"); 503 /* no big deal if it fails.. */ 504 } 505 if (pfh != NULL && pidfile_write(pfh) == -1) { 506 syslog(LOG_WARNING, "pidfile_write(): %m"); 507 } 508 } 509 510 if (madvise(NULL, 0, MADV_PROTECT) != 0) 511 syslog(LOG_WARNING, "madvise() failed: %s", strerror(errno)); 512 513 for (i = 0; i < PERIPSIZE; ++i) 514 LIST_INIT(&proctable[i]); 515 516 if (v4bind_ok) { 517 udpconf = getnetconfigent("udp"); 518 tcpconf = getnetconfigent("tcp"); 519 if (udpconf == NULL || tcpconf == NULL) { 520 syslog(LOG_ERR, "unknown rpc/udp or rpc/tcp"); 521 exit(EX_USAGE); 522 } 523 } 524 #ifdef INET6 525 if (v6bind_ok) { 526 udp6conf = getnetconfigent("udp6"); 527 tcp6conf = getnetconfigent("tcp6"); 528 if (udp6conf == NULL || tcp6conf == NULL) { 529 syslog(LOG_ERR, "unknown rpc/udp6 or rpc/tcp6"); 530 exit(EX_USAGE); 531 } 532 } 533 #endif 534 535 sa.sa_flags = 0; 536 sigemptyset(&sa.sa_mask); 537 sigaddset(&sa.sa_mask, SIGALRM); 538 sigaddset(&sa.sa_mask, SIGCHLD); 539 sigaddset(&sa.sa_mask, SIGHUP); 540 sa.sa_handler = flag_retry; 541 sigaction(SIGALRM, &sa, &saalrm); 542 config(); 543 sa.sa_handler = flag_config; 544 sigaction(SIGHUP, &sa, &sahup); 545 sa.sa_handler = flag_reapchild; 546 sigaction(SIGCHLD, &sa, &sachld); 547 sa.sa_handler = SIG_IGN; 548 sigaction(SIGPIPE, &sa, &sapipe); 549 550 { 551 /* space for daemons to overwrite environment for ps */ 552 #define DUMMYSIZE 100 553 char dummy[DUMMYSIZE]; 554 555 (void)memset(dummy, 'x', DUMMYSIZE - 1); 556 dummy[DUMMYSIZE - 1] = '\0'; 557 (void)setenv("inetd_dummy", dummy, 1); 558 } 559 560 if (pipe2(signalpipe, O_CLOEXEC) != 0) { 561 syslog(LOG_ERR, "pipe: %m"); 562 exit(EX_OSERR); 563 } 564 FD_SET(signalpipe[0], &allsock); 565 #ifdef SANITY_CHECK 566 nsock++; 567 #endif 568 if (signalpipe[0] > maxsock) 569 maxsock = signalpipe[0]; 570 if (signalpipe[1] > maxsock) 571 maxsock = signalpipe[1]; 572 573 for (;;) { 574 int n, ctrl; 575 fd_set readable; 576 577 #ifdef SANITY_CHECK 578 if (nsock == 0) { 579 syslog(LOG_ERR, "%s: nsock=0", __func__); 580 exit(EX_SOFTWARE); 581 } 582 #endif 583 readable = allsock; 584 if ((n = select(maxsock + 1, &readable, (fd_set *)0, 585 (fd_set *)0, (struct timeval *)0)) <= 0) { 586 if (n < 0 && errno != EINTR) { 587 syslog(LOG_WARNING, "select: %m"); 588 sleep(1); 589 } 590 continue; 591 } 592 /* handle any queued signal flags */ 593 if (FD_ISSET(signalpipe[0], &readable)) { 594 int nsig; 595 if (ioctl(signalpipe[0], FIONREAD, &nsig) != 0) { 596 syslog(LOG_ERR, "ioctl: %m"); 597 exit(EX_OSERR); 598 } 599 while (--nsig >= 0) { 600 char c; 601 if (read(signalpipe[0], &c, 1) != 1) { 602 syslog(LOG_ERR, "read: %m"); 603 exit(EX_OSERR); 604 } 605 if (debug) 606 warnx("handling signal flag %c", c); 607 switch(c) { 608 case 'A': /* sigalrm */ 609 retry(); 610 break; 611 case 'C': /* sigchld */ 612 reapchild(); 613 break; 614 case 'H': /* sighup */ 615 config(); 616 break; 617 } 618 } 619 } 620 for (sep = servtab; n && sep; sep = sep->se_next) 621 if (sep->se_fd != -1 && FD_ISSET(sep->se_fd, &readable)) { 622 n--; 623 if (debug) 624 warnx("someone wants %s", sep->se_service); 625 dofork = !sep->se_bi || sep->se_bi->bi_fork || ISWRAP(sep); 626 conn = NULL; 627 if (sep->se_accept && sep->se_socktype == SOCK_STREAM) { 628 i = 1; 629 if (ioctl(sep->se_fd, FIONBIO, &i) < 0) 630 syslog(LOG_ERR, "ioctl (FIONBIO, 1): %m"); 631 ctrl = accept(sep->se_fd, (struct sockaddr *)0, 632 (socklen_t *)0); 633 if (debug) 634 warnx("accept, ctrl %d", ctrl); 635 if (ctrl < 0) { 636 if (errno != EINTR) 637 syslog(LOG_WARNING, 638 "accept (for %s): %m", 639 sep->se_service); 640 if (sep->se_accept && 641 sep->se_socktype == SOCK_STREAM) 642 close(ctrl); 643 continue; 644 } 645 i = 0; 646 if (ioctl(sep->se_fd, FIONBIO, &i) < 0) 647 syslog(LOG_ERR, "ioctl1(FIONBIO, 0): %m"); 648 if (ioctl(ctrl, FIONBIO, &i) < 0) 649 syslog(LOG_ERR, "ioctl2(FIONBIO, 0): %m"); 650 if (cpmip(sep, ctrl) < 0) { 651 close(ctrl); 652 continue; 653 } 654 if (dofork && 655 (conn = search_conn(sep, ctrl)) != NULL && 656 !room_conn(sep, conn)) { 657 close(ctrl); 658 continue; 659 } 660 } else 661 ctrl = sep->se_fd; 662 if (dolog && !ISWRAP(sep)) { 663 char pname[NI_MAXHOST] = "unknown"; 664 socklen_t sl; 665 sl = sizeof(peer); 666 if (getpeername(ctrl, (struct sockaddr *) 667 &peer, &sl)) { 668 sl = sizeof(peer); 669 if (recvfrom(ctrl, buf, sizeof(buf), 670 MSG_PEEK, 671 (struct sockaddr *)&peer, 672 &sl) >= 0) { 673 getnameinfo((struct sockaddr *)&peer, 674 peer.ss_len, 675 pname, sizeof(pname), 676 NULL, 0, NI_NUMERICHOST); 677 } 678 } else { 679 getnameinfo((struct sockaddr *)&peer, 680 peer.ss_len, 681 pname, sizeof(pname), 682 NULL, 0, NI_NUMERICHOST); 683 } 684 syslog(LOG_INFO,"%s from %s", sep->se_service, pname); 685 } 686 (void) sigblock(SIGBLOCK); 687 pid = 0; 688 /* 689 * Fork for all external services, builtins which need to 690 * fork and anything we're wrapping (as wrapping might 691 * block or use hosts_options(5) twist). 692 */ 693 if (dofork) { 694 if (sep->se_count++ == 0) 695 (void)clock_gettime(CLOCK_MONOTONIC_FAST, &sep->se_time); 696 else if (toomany > 0 && sep->se_count >= toomany) { 697 struct timespec now; 698 699 (void)clock_gettime(CLOCK_MONOTONIC_FAST, &now); 700 if (now.tv_sec - sep->se_time.tv_sec > 701 CNT_INTVL) { 702 sep->se_time = now; 703 sep->se_count = 1; 704 } else { 705 syslog(LOG_ERR, 706 "%s/%s server failing (looping), service terminated", 707 sep->se_service, sep->se_proto); 708 if (sep->se_accept && 709 sep->se_socktype == SOCK_STREAM) 710 close(ctrl); 711 close_sep(sep); 712 free_conn(conn); 713 sigsetmask(0L); 714 if (!timingout) { 715 timingout = 1; 716 alarm(RETRYTIME); 717 } 718 continue; 719 } 720 } 721 pid = fork(); 722 } 723 if (pid < 0) { 724 syslog(LOG_ERR, "fork: %m"); 725 if (sep->se_accept && 726 sep->se_socktype == SOCK_STREAM) 727 close(ctrl); 728 free_conn(conn); 729 sigsetmask(0L); 730 sleep(1); 731 continue; 732 } 733 if (pid) { 734 addchild_conn(conn, pid); 735 addchild(sep, pid); 736 } 737 sigsetmask(0L); 738 if (pid == 0) { 739 pidfile_close(pfh); 740 if (dofork) { 741 sigaction(SIGALRM, &saalrm, (struct sigaction *)0); 742 sigaction(SIGCHLD, &sachld, (struct sigaction *)0); 743 sigaction(SIGHUP, &sahup, (struct sigaction *)0); 744 /* SIGPIPE reset before exec */ 745 } 746 /* 747 * Call tcpmux to find the real service to exec. 748 */ 749 if (sep->se_bi && 750 sep->se_bi->bi_fn == (bi_fn_t *) tcpmux) { 751 sep = tcpmux(ctrl); 752 if (sep == NULL) { 753 close(ctrl); 754 _exit(0); 755 } 756 } 757 #ifdef LIBWRAP 758 if (ISWRAP(sep)) { 759 inetd_setproctitle("wrapping", ctrl); 760 service = sep->se_server_name ? 761 sep->se_server_name : sep->se_service; 762 request_init(&req, RQ_DAEMON, service, RQ_FILE, ctrl, 0); 763 fromhost(&req); 764 deny_severity = LIBWRAP_DENY_FACILITY|LIBWRAP_DENY_SEVERITY; 765 allow_severity = LIBWRAP_ALLOW_FACILITY|LIBWRAP_ALLOW_SEVERITY; 766 denied = !hosts_access(&req); 767 if (denied) { 768 syslog(deny_severity, 769 "refused connection from %.500s, service %s (%s%s)", 770 eval_client(&req), service, sep->se_proto, 771 (whichaf(&req) == AF_INET6) ? "6" : ""); 772 if (sep->se_socktype != SOCK_STREAM) 773 recv(ctrl, buf, sizeof (buf), 0); 774 if (dofork) { 775 sleep(1); 776 _exit(0); 777 } 778 } 779 if (dolog) { 780 syslog(allow_severity, 781 "connection from %.500s, service %s (%s%s)", 782 eval_client(&req), service, sep->se_proto, 783 (whichaf(&req) == AF_INET6) ? "6" : ""); 784 } 785 } 786 #endif 787 if (sep->se_bi) { 788 (*sep->se_bi->bi_fn)(ctrl, sep); 789 } else { 790 if (debug) 791 warnx("%d execl %s", 792 getpid(), sep->se_server); 793 /* Clear close-on-exec. */ 794 if (fcntl(ctrl, F_SETFD, 0) < 0) { 795 syslog(LOG_ERR, 796 "%s/%s: fcntl (F_SETFD, 0): %m", 797 sep->se_service, sep->se_proto); 798 _exit(EX_OSERR); 799 } 800 if (ctrl != 0) { 801 dup2(ctrl, 0); 802 close(ctrl); 803 } 804 dup2(0, 1); 805 dup2(0, 2); 806 if ((pwd = getpwnam(sep->se_user)) == NULL) { 807 syslog(LOG_ERR, 808 "%s/%s: %s: no such user", 809 sep->se_service, sep->se_proto, 810 sep->se_user); 811 if (sep->se_socktype != SOCK_STREAM) 812 recv(0, buf, sizeof (buf), 0); 813 _exit(EX_NOUSER); 814 } 815 grp = NULL; 816 if ( sep->se_group != NULL 817 && (grp = getgrnam(sep->se_group)) == NULL 818 ) { 819 syslog(LOG_ERR, 820 "%s/%s: %s: no such group", 821 sep->se_service, sep->se_proto, 822 sep->se_group); 823 if (sep->se_socktype != SOCK_STREAM) 824 recv(0, buf, sizeof (buf), 0); 825 _exit(EX_NOUSER); 826 } 827 if (grp != NULL) 828 pwd->pw_gid = grp->gr_gid; 829 #ifdef LOGIN_CAP 830 if ((lc = login_getclass(sep->se_class)) == NULL) { 831 /* error syslogged by getclass */ 832 syslog(LOG_ERR, 833 "%s/%s: %s: login class error", 834 sep->se_service, sep->se_proto, 835 sep->se_class); 836 if (sep->se_socktype != SOCK_STREAM) 837 recv(0, buf, sizeof (buf), 0); 838 _exit(EX_NOUSER); 839 } 840 #endif 841 if (setsid() < 0) { 842 syslog(LOG_ERR, 843 "%s: can't setsid(): %m", 844 sep->se_service); 845 /* _exit(EX_OSERR); not fatal yet */ 846 } 847 #ifdef LOGIN_CAP 848 if (setusercontext(lc, pwd, pwd->pw_uid, 849 LOGIN_SETALL & ~LOGIN_SETMAC) 850 != 0) { 851 syslog(LOG_ERR, 852 "%s: can't setusercontext(..%s..): %m", 853 sep->se_service, sep->se_user); 854 _exit(EX_OSERR); 855 } 856 login_close(lc); 857 #else 858 if (pwd->pw_uid) { 859 if (setlogin(sep->se_user) < 0) { 860 syslog(LOG_ERR, 861 "%s: can't setlogin(%s): %m", 862 sep->se_service, sep->se_user); 863 /* _exit(EX_OSERR); not yet */ 864 } 865 if (setgid(pwd->pw_gid) < 0) { 866 syslog(LOG_ERR, 867 "%s: can't set gid %d: %m", 868 sep->se_service, pwd->pw_gid); 869 _exit(EX_OSERR); 870 } 871 (void) initgroups(pwd->pw_name, 872 pwd->pw_gid); 873 if (setuid(pwd->pw_uid) < 0) { 874 syslog(LOG_ERR, 875 "%s: can't set uid %d: %m", 876 sep->se_service, pwd->pw_uid); 877 _exit(EX_OSERR); 878 } 879 } 880 #endif 881 sigaction(SIGPIPE, &sapipe, 882 (struct sigaction *)0); 883 execv(sep->se_server, sep->se_argv); 884 syslog(LOG_ERR, 885 "cannot execute %s: %m", sep->se_server); 886 if (sep->se_socktype != SOCK_STREAM) 887 recv(0, buf, sizeof (buf), 0); 888 } 889 if (dofork) 890 _exit(0); 891 } 892 if (sep->se_accept && sep->se_socktype == SOCK_STREAM) 893 close(ctrl); 894 } 895 } 896 } 897 898 /* 899 * Add a signal flag to the signal flag queue for later handling 900 */ 901 902 static void 903 flag_signal(int c) 904 { 905 char ch = c; 906 907 if (write(signalpipe[1], &ch, 1) != 1) { 908 syslog(LOG_ERR, "write: %m"); 909 _exit(EX_OSERR); 910 } 911 } 912 913 /* 914 * Record a new child pid for this service. If we've reached the 915 * limit on children, then stop accepting incoming requests. 916 */ 917 918 static void 919 addchild(struct servtab *sep, pid_t pid) 920 { 921 if (sep->se_maxchild <= 0) 922 return; 923 #ifdef SANITY_CHECK 924 if (sep->se_numchild >= sep->se_maxchild) { 925 syslog(LOG_ERR, "%s: %d >= %d", 926 __func__, sep->se_numchild, sep->se_maxchild); 927 exit(EX_SOFTWARE); 928 } 929 #endif 930 sep->se_pids[sep->se_numchild++] = pid; 931 if (sep->se_numchild == sep->se_maxchild) 932 disable(sep); 933 } 934 935 /* 936 * Some child process has exited. See if it's on somebody's list. 937 */ 938 939 static void 940 flag_reapchild(int signo __unused) 941 { 942 flag_signal('C'); 943 } 944 945 static void 946 reapchild(void) 947 { 948 int k, status; 949 pid_t pid; 950 struct servtab *sep; 951 952 for (;;) { 953 pid = wait3(&status, WNOHANG, (struct rusage *)0); 954 if (pid <= 0) 955 break; 956 if (debug) 957 warnx("%d reaped, %s %u", pid, 958 WIFEXITED(status) ? "status" : "signal", 959 WIFEXITED(status) ? WEXITSTATUS(status) 960 : WTERMSIG(status)); 961 for (sep = servtab; sep; sep = sep->se_next) { 962 for (k = 0; k < sep->se_numchild; k++) 963 if (sep->se_pids[k] == pid) 964 break; 965 if (k == sep->se_numchild) 966 continue; 967 if (sep->se_numchild == sep->se_maxchild) 968 enable(sep); 969 sep->se_pids[k] = sep->se_pids[--sep->se_numchild]; 970 if (WIFSIGNALED(status) || WEXITSTATUS(status)) 971 syslog(LOG_WARNING, 972 "%s[%d]: exited, %s %u", 973 sep->se_server, pid, 974 WIFEXITED(status) ? "status" : "signal", 975 WIFEXITED(status) ? WEXITSTATUS(status) 976 : WTERMSIG(status)); 977 break; 978 } 979 reapchild_conn(pid); 980 } 981 } 982 983 static void 984 flag_config(int signo __unused) 985 { 986 flag_signal('H'); 987 } 988 989 static void 990 config(void) 991 { 992 struct servtab *sep, *new, **sepp; 993 long omask; 994 int new_nomapped; 995 #ifdef LOGIN_CAP 996 login_cap_t *lc = NULL; 997 #endif 998 999 if (!setconfig()) { 1000 syslog(LOG_ERR, "%s: %m", CONFIG); 1001 return; 1002 } 1003 for (sep = servtab; sep; sep = sep->se_next) 1004 sep->se_checked = 0; 1005 while ((new = getconfigent())) { 1006 if (getpwnam(new->se_user) == NULL) { 1007 syslog(LOG_ERR, 1008 "%s/%s: no such user '%s', service ignored", 1009 new->se_service, new->se_proto, new->se_user); 1010 continue; 1011 } 1012 if (new->se_group && getgrnam(new->se_group) == NULL) { 1013 syslog(LOG_ERR, 1014 "%s/%s: no such group '%s', service ignored", 1015 new->se_service, new->se_proto, new->se_group); 1016 continue; 1017 } 1018 #ifdef LOGIN_CAP 1019 if ((lc = login_getclass(new->se_class)) == NULL) { 1020 /* error syslogged by getclass */ 1021 syslog(LOG_ERR, 1022 "%s/%s: %s: login class error, service ignored", 1023 new->se_service, new->se_proto, new->se_class); 1024 continue; 1025 } 1026 login_close(lc); 1027 #endif 1028 new_nomapped = new->se_nomapped; 1029 for (sep = servtab; sep; sep = sep->se_next) 1030 if (strcmp(sep->se_service, new->se_service) == 0 && 1031 strcmp(sep->se_proto, new->se_proto) == 0 && 1032 sep->se_rpc == new->se_rpc && 1033 sep->se_socktype == new->se_socktype && 1034 sep->se_family == new->se_family) 1035 break; 1036 if (sep != 0) { 1037 int i; 1038 1039 #define SWAP(t,a, b) { t c = a; a = b; b = c; } 1040 omask = sigblock(SIGBLOCK); 1041 if (sep->se_nomapped != new->se_nomapped) { 1042 /* for rpc keep old nommaped till unregister */ 1043 if (!sep->se_rpc) 1044 sep->se_nomapped = new->se_nomapped; 1045 sep->se_reset = 1; 1046 } 1047 /* copy over outstanding child pids */ 1048 if (sep->se_maxchild > 0 && new->se_maxchild > 0) { 1049 new->se_numchild = sep->se_numchild; 1050 if (new->se_numchild > new->se_maxchild) 1051 new->se_numchild = new->se_maxchild; 1052 memcpy(new->se_pids, sep->se_pids, 1053 new->se_numchild * sizeof(*new->se_pids)); 1054 } 1055 SWAP(pid_t *, sep->se_pids, new->se_pids); 1056 sep->se_maxchild = new->se_maxchild; 1057 sep->se_numchild = new->se_numchild; 1058 sep->se_maxcpm = new->se_maxcpm; 1059 resize_conn(sep, new->se_maxperip); 1060 sep->se_maxperip = new->se_maxperip; 1061 sep->se_bi = new->se_bi; 1062 /* might need to turn on or off service now */ 1063 if (sep->se_fd >= 0) { 1064 if (sep->se_maxchild > 0 1065 && sep->se_numchild == sep->se_maxchild) { 1066 if (FD_ISSET(sep->se_fd, &allsock)) 1067 disable(sep); 1068 } else { 1069 if (!FD_ISSET(sep->se_fd, &allsock)) 1070 enable(sep); 1071 } 1072 } 1073 sep->se_accept = new->se_accept; 1074 SWAP(char *, sep->se_user, new->se_user); 1075 SWAP(char *, sep->se_group, new->se_group); 1076 #ifdef LOGIN_CAP 1077 SWAP(char *, sep->se_class, new->se_class); 1078 #endif 1079 SWAP(char *, sep->se_server, new->se_server); 1080 SWAP(char *, sep->se_server_name, new->se_server_name); 1081 for (i = 0; i < MAXARGV; i++) 1082 SWAP(char *, sep->se_argv[i], new->se_argv[i]); 1083 #ifdef IPSEC 1084 SWAP(char *, sep->se_policy, new->se_policy); 1085 ipsecsetup(sep); 1086 #endif 1087 sigsetmask(omask); 1088 freeconfig(new); 1089 if (debug) 1090 print_service("REDO", sep); 1091 } else { 1092 sep = enter(new); 1093 if (debug) 1094 print_service("ADD ", sep); 1095 } 1096 sep->se_checked = 1; 1097 if (ISMUX(sep)) { 1098 sep->se_fd = -1; 1099 continue; 1100 } 1101 switch (sep->se_family) { 1102 case AF_INET: 1103 if (!v4bind_ok) { 1104 sep->se_fd = -1; 1105 continue; 1106 } 1107 break; 1108 #ifdef INET6 1109 case AF_INET6: 1110 if (!v6bind_ok) { 1111 sep->se_fd = -1; 1112 continue; 1113 } 1114 break; 1115 #endif 1116 } 1117 if (!sep->se_rpc) { 1118 if (sep->se_family != AF_UNIX) { 1119 sp = getservbyname(sep->se_service, sep->se_proto); 1120 if (sp == 0) { 1121 syslog(LOG_ERR, "%s/%s: unknown service", 1122 sep->se_service, sep->se_proto); 1123 sep->se_checked = 0; 1124 continue; 1125 } 1126 } 1127 switch (sep->se_family) { 1128 case AF_INET: 1129 if (sp->s_port != sep->se_ctrladdr4.sin_port) { 1130 sep->se_ctrladdr4.sin_port = 1131 sp->s_port; 1132 sep->se_reset = 1; 1133 } 1134 break; 1135 #ifdef INET6 1136 case AF_INET6: 1137 if (sp->s_port != 1138 sep->se_ctrladdr6.sin6_port) { 1139 sep->se_ctrladdr6.sin6_port = 1140 sp->s_port; 1141 sep->se_reset = 1; 1142 } 1143 break; 1144 #endif 1145 } 1146 if (sep->se_reset != 0 && sep->se_fd >= 0) 1147 close_sep(sep); 1148 } else { 1149 rpc = getrpcbyname(sep->se_service); 1150 if (rpc == 0) { 1151 syslog(LOG_ERR, "%s/%s unknown RPC service", 1152 sep->se_service, sep->se_proto); 1153 if (sep->se_fd != -1) 1154 (void) close(sep->se_fd); 1155 sep->se_fd = -1; 1156 continue; 1157 } 1158 if (sep->se_reset != 0 || 1159 rpc->r_number != sep->se_rpc_prog) { 1160 if (sep->se_rpc_prog) 1161 unregisterrpc(sep); 1162 sep->se_rpc_prog = rpc->r_number; 1163 if (sep->se_fd != -1) 1164 (void) close(sep->se_fd); 1165 sep->se_fd = -1; 1166 } 1167 sep->se_nomapped = new_nomapped; 1168 } 1169 sep->se_reset = 0; 1170 if (sep->se_fd == -1) 1171 setup(sep); 1172 } 1173 endconfig(); 1174 /* 1175 * Purge anything not looked at above. 1176 */ 1177 omask = sigblock(SIGBLOCK); 1178 sepp = &servtab; 1179 while ((sep = *sepp)) { 1180 if (sep->se_checked) { 1181 sepp = &sep->se_next; 1182 continue; 1183 } 1184 *sepp = sep->se_next; 1185 if (sep->se_fd >= 0) 1186 close_sep(sep); 1187 if (debug) 1188 print_service("FREE", sep); 1189 if (sep->se_rpc && sep->se_rpc_prog > 0) 1190 unregisterrpc(sep); 1191 freeconfig(sep); 1192 free(sep); 1193 } 1194 (void) sigsetmask(omask); 1195 } 1196 1197 static void 1198 unregisterrpc(struct servtab *sep) 1199 { 1200 u_int i; 1201 struct servtab *sepp; 1202 long omask; 1203 struct netconfig *netid4, *netid6; 1204 1205 omask = sigblock(SIGBLOCK); 1206 netid4 = sep->se_socktype == SOCK_DGRAM ? udpconf : tcpconf; 1207 netid6 = sep->se_socktype == SOCK_DGRAM ? udp6conf : tcp6conf; 1208 if (sep->se_family == AF_INET) 1209 netid6 = NULL; 1210 else if (sep->se_nomapped) 1211 netid4 = NULL; 1212 /* 1213 * Conflict if same prog and protocol - In that case one should look 1214 * to versions, but it is not interesting: having separate servers for 1215 * different versions does not work well. 1216 * Therefore one do not unregister if there is a conflict. 1217 * There is also transport conflict if destroying INET when INET46 1218 * exists, or destroying INET46 when INET exists 1219 */ 1220 for (sepp = servtab; sepp; sepp = sepp->se_next) { 1221 if (sepp == sep) 1222 continue; 1223 if (sepp->se_checked == 0 || 1224 !sepp->se_rpc || 1225 strcmp(sep->se_proto, sepp->se_proto) != 0 || 1226 sep->se_rpc_prog != sepp->se_rpc_prog) 1227 continue; 1228 if (sepp->se_family == AF_INET) 1229 netid4 = NULL; 1230 if (sepp->se_family == AF_INET6) { 1231 netid6 = NULL; 1232 if (!sep->se_nomapped) 1233 netid4 = NULL; 1234 } 1235 if (netid4 == NULL && netid6 == NULL) 1236 return; 1237 } 1238 if (debug) 1239 print_service("UNREG", sep); 1240 for (i = sep->se_rpc_lowvers; i <= sep->se_rpc_highvers; i++) { 1241 if (netid4) 1242 rpcb_unset(sep->se_rpc_prog, i, netid4); 1243 if (netid6) 1244 rpcb_unset(sep->se_rpc_prog, i, netid6); 1245 } 1246 if (sep->se_fd != -1) 1247 (void) close(sep->se_fd); 1248 sep->se_fd = -1; 1249 (void) sigsetmask(omask); 1250 } 1251 1252 static void 1253 flag_retry(int signo __unused) 1254 { 1255 flag_signal('A'); 1256 } 1257 1258 static void 1259 retry(void) 1260 { 1261 struct servtab *sep; 1262 1263 timingout = 0; 1264 for (sep = servtab; sep; sep = sep->se_next) 1265 if (sep->se_fd == -1 && !ISMUX(sep)) 1266 setup(sep); 1267 } 1268 1269 static void 1270 setup(struct servtab *sep) 1271 { 1272 int on = 1; 1273 1274 /* Set all listening sockets to close-on-exec. */ 1275 if ((sep->se_fd = socket(sep->se_family, 1276 sep->se_socktype | SOCK_CLOEXEC, 0)) < 0) { 1277 if (debug) 1278 warn("socket failed on %s/%s", 1279 sep->se_service, sep->se_proto); 1280 syslog(LOG_ERR, "%s/%s: socket: %m", 1281 sep->se_service, sep->se_proto); 1282 return; 1283 } 1284 #define turnon(fd, opt) \ 1285 setsockopt(fd, SOL_SOCKET, opt, (char *)&on, sizeof (on)) 1286 if (strcmp(sep->se_proto, "tcp") == 0 && (options & SO_DEBUG) && 1287 turnon(sep->se_fd, SO_DEBUG) < 0) 1288 syslog(LOG_ERR, "setsockopt (SO_DEBUG): %m"); 1289 if (turnon(sep->se_fd, SO_REUSEADDR) < 0) 1290 syslog(LOG_ERR, "setsockopt (SO_REUSEADDR): %m"); 1291 #ifdef SO_PRIVSTATE 1292 if (turnon(sep->se_fd, SO_PRIVSTATE) < 0) 1293 syslog(LOG_ERR, "setsockopt (SO_PRIVSTATE): %m"); 1294 #endif 1295 /* tftpd opens a new connection then needs more infos */ 1296 #ifdef INET6 1297 if ((sep->se_family == AF_INET6) && 1298 (strcmp(sep->se_proto, "udp") == 0) && 1299 (sep->se_accept == 0) && 1300 (setsockopt(sep->se_fd, IPPROTO_IPV6, IPV6_RECVPKTINFO, 1301 (char *)&on, sizeof (on)) < 0)) 1302 syslog(LOG_ERR, "setsockopt (IPV6_RECVPKTINFO): %m"); 1303 if (sep->se_family == AF_INET6) { 1304 int flag = sep->se_nomapped ? 1 : 0; 1305 if (setsockopt(sep->se_fd, IPPROTO_IPV6, IPV6_V6ONLY, 1306 (char *)&flag, sizeof (flag)) < 0) 1307 syslog(LOG_ERR, "setsockopt (IPV6_V6ONLY): %m"); 1308 } 1309 #endif 1310 #undef turnon 1311 #ifdef IPSEC 1312 ipsecsetup(sep); 1313 #endif 1314 if (sep->se_family == AF_UNIX) { 1315 (void) unlink(sep->se_ctrladdr_un.sun_path); 1316 umask(0777); /* Make socket with conservative permissions */ 1317 } 1318 if (bind(sep->se_fd, (struct sockaddr *)&sep->se_ctrladdr, 1319 sep->se_ctrladdr_size) < 0) { 1320 if (debug) 1321 warn("bind failed on %s/%s", 1322 sep->se_service, sep->se_proto); 1323 syslog(LOG_ERR, "%s/%s: bind: %m", 1324 sep->se_service, sep->se_proto); 1325 (void) close(sep->se_fd); 1326 sep->se_fd = -1; 1327 if (!timingout) { 1328 timingout = 1; 1329 alarm(RETRYTIME); 1330 } 1331 if (sep->se_family == AF_UNIX) 1332 umask(mask); 1333 return; 1334 } 1335 if (sep->se_family == AF_UNIX) { 1336 /* Ick - fch{own,mod} don't work on Unix domain sockets */ 1337 if (chown(sep->se_service, sep->se_sockuid, sep->se_sockgid) < 0) 1338 syslog(LOG_ERR, "chown socket: %m"); 1339 if (chmod(sep->se_service, sep->se_sockmode) < 0) 1340 syslog(LOG_ERR, "chmod socket: %m"); 1341 umask(mask); 1342 } 1343 if (sep->se_rpc) { 1344 u_int i; 1345 socklen_t len = sep->se_ctrladdr_size; 1346 struct netconfig *netid, *netid2 = NULL; 1347 #ifdef INET6 1348 struct sockaddr_in sock; 1349 #endif 1350 struct netbuf nbuf, nbuf2; 1351 1352 if (getsockname(sep->se_fd, 1353 (struct sockaddr*)&sep->se_ctrladdr, &len) < 0){ 1354 syslog(LOG_ERR, "%s/%s: getsockname: %m", 1355 sep->se_service, sep->se_proto); 1356 (void) close(sep->se_fd); 1357 sep->se_fd = -1; 1358 return; 1359 } 1360 nbuf.buf = &sep->se_ctrladdr; 1361 nbuf.len = sep->se_ctrladdr.sa_len; 1362 if (sep->se_family == AF_INET) 1363 netid = sep->se_socktype==SOCK_DGRAM? udpconf:tcpconf; 1364 #ifdef INET6 1365 else { 1366 netid = sep->se_socktype==SOCK_DGRAM? udp6conf:tcp6conf; 1367 if (!sep->se_nomapped) { /* INET and INET6 */ 1368 netid2 = netid==udp6conf? udpconf:tcpconf; 1369 memset(&sock, 0, sizeof sock); /* ADDR_ANY */ 1370 nbuf2.buf = &sock; 1371 nbuf2.len = sock.sin_len = sizeof sock; 1372 sock.sin_family = AF_INET; 1373 sock.sin_port = sep->se_ctrladdr6.sin6_port; 1374 } 1375 } 1376 #endif 1377 if (debug) 1378 print_service("REG ", sep); 1379 for (i = sep->se_rpc_lowvers; i <= sep->se_rpc_highvers; i++) { 1380 rpcb_unset(sep->se_rpc_prog, i, netid); 1381 rpcb_set(sep->se_rpc_prog, i, netid, &nbuf); 1382 if (netid2) { 1383 rpcb_unset(sep->se_rpc_prog, i, netid2); 1384 rpcb_set(sep->se_rpc_prog, i, netid2, &nbuf2); 1385 } 1386 } 1387 } 1388 if (sep->se_socktype == SOCK_STREAM) 1389 listen(sep->se_fd, -1); 1390 enable(sep); 1391 if (debug) { 1392 warnx("registered %s on %d", 1393 sep->se_server, sep->se_fd); 1394 } 1395 } 1396 1397 #ifdef IPSEC 1398 static void 1399 ipsecsetup(struct servtab *sep) 1400 { 1401 char *buf; 1402 char *policy_in = NULL; 1403 char *policy_out = NULL; 1404 int level; 1405 int opt; 1406 1407 switch (sep->se_family) { 1408 case AF_INET: 1409 level = IPPROTO_IP; 1410 opt = IP_IPSEC_POLICY; 1411 break; 1412 #ifdef INET6 1413 case AF_INET6: 1414 level = IPPROTO_IPV6; 1415 opt = IPV6_IPSEC_POLICY; 1416 break; 1417 #endif 1418 default: 1419 return; 1420 } 1421 1422 if (!sep->se_policy || sep->se_policy[0] == '\0') { 1423 static char def_in[] = "in entrust", def_out[] = "out entrust"; 1424 policy_in = def_in; 1425 policy_out = def_out; 1426 } else { 1427 if (!strncmp("in", sep->se_policy, 2)) 1428 policy_in = sep->se_policy; 1429 else if (!strncmp("out", sep->se_policy, 3)) 1430 policy_out = sep->se_policy; 1431 else { 1432 syslog(LOG_ERR, "invalid security policy \"%s\"", 1433 sep->se_policy); 1434 return; 1435 } 1436 } 1437 1438 if (policy_in != NULL) { 1439 buf = ipsec_set_policy(policy_in, strlen(policy_in)); 1440 if (buf != NULL) { 1441 if (setsockopt(sep->se_fd, level, opt, 1442 buf, ipsec_get_policylen(buf)) < 0 && 1443 debug != 0) 1444 warnx("%s/%s: ipsec initialization failed; %s", 1445 sep->se_service, sep->se_proto, 1446 policy_in); 1447 free(buf); 1448 } else 1449 syslog(LOG_ERR, "invalid security policy \"%s\"", 1450 policy_in); 1451 } 1452 if (policy_out != NULL) { 1453 buf = ipsec_set_policy(policy_out, strlen(policy_out)); 1454 if (buf != NULL) { 1455 if (setsockopt(sep->se_fd, level, opt, 1456 buf, ipsec_get_policylen(buf)) < 0 && 1457 debug != 0) 1458 warnx("%s/%s: ipsec initialization failed; %s", 1459 sep->se_service, sep->se_proto, 1460 policy_out); 1461 free(buf); 1462 } else 1463 syslog(LOG_ERR, "invalid security policy \"%s\"", 1464 policy_out); 1465 } 1466 } 1467 #endif 1468 1469 /* 1470 * Finish with a service and its socket. 1471 */ 1472 static void 1473 close_sep(struct servtab *sep) 1474 { 1475 if (sep->se_fd >= 0) { 1476 if (FD_ISSET(sep->se_fd, &allsock)) 1477 disable(sep); 1478 (void) close(sep->se_fd); 1479 sep->se_fd = -1; 1480 } 1481 sep->se_count = 0; 1482 sep->se_numchild = 0; /* forget about any existing children */ 1483 } 1484 1485 static int 1486 matchservent(const char *name1, const char *name2, const char *proto) 1487 { 1488 char **alias, *p; 1489 struct servent *se; 1490 1491 if (strcmp(proto, "unix") == 0) { 1492 if ((p = strrchr(name1, '/')) != NULL) 1493 name1 = p + 1; 1494 if ((p = strrchr(name2, '/')) != NULL) 1495 name2 = p + 1; 1496 } 1497 if (strcmp(name1, name2) == 0) 1498 return(1); 1499 if ((se = getservbyname(name1, proto)) != NULL) { 1500 if (strcmp(name2, se->s_name) == 0) 1501 return(1); 1502 for (alias = se->s_aliases; *alias; alias++) 1503 if (strcmp(name2, *alias) == 0) 1504 return(1); 1505 } 1506 return(0); 1507 } 1508 1509 static struct servtab * 1510 enter(struct servtab *cp) 1511 { 1512 struct servtab *sep; 1513 long omask; 1514 1515 sep = (struct servtab *)malloc(sizeof (*sep)); 1516 if (sep == (struct servtab *)0) { 1517 syslog(LOG_ERR, "malloc: %m"); 1518 exit(EX_OSERR); 1519 } 1520 *sep = *cp; 1521 sep->se_fd = -1; 1522 omask = sigblock(SIGBLOCK); 1523 sep->se_next = servtab; 1524 servtab = sep; 1525 sigsetmask(omask); 1526 return (sep); 1527 } 1528 1529 static void 1530 enable(struct servtab *sep) 1531 { 1532 if (debug) 1533 warnx( 1534 "enabling %s, fd %d", sep->se_service, sep->se_fd); 1535 #ifdef SANITY_CHECK 1536 if (sep->se_fd < 0) { 1537 syslog(LOG_ERR, 1538 "%s: %s: bad fd", __func__, sep->se_service); 1539 exit(EX_SOFTWARE); 1540 } 1541 if (ISMUX(sep)) { 1542 syslog(LOG_ERR, 1543 "%s: %s: is mux", __func__, sep->se_service); 1544 exit(EX_SOFTWARE); 1545 } 1546 if (FD_ISSET(sep->se_fd, &allsock)) { 1547 syslog(LOG_ERR, 1548 "%s: %s: not off", __func__, sep->se_service); 1549 exit(EX_SOFTWARE); 1550 } 1551 nsock++; 1552 #endif 1553 FD_SET(sep->se_fd, &allsock); 1554 if (sep->se_fd > maxsock) 1555 maxsock = sep->se_fd; 1556 } 1557 1558 static void 1559 disable(struct servtab *sep) 1560 { 1561 if (debug) 1562 warnx( 1563 "disabling %s, fd %d", sep->se_service, sep->se_fd); 1564 #ifdef SANITY_CHECK 1565 if (sep->se_fd < 0) { 1566 syslog(LOG_ERR, 1567 "%s: %s: bad fd", __func__, sep->se_service); 1568 exit(EX_SOFTWARE); 1569 } 1570 if (ISMUX(sep)) { 1571 syslog(LOG_ERR, 1572 "%s: %s: is mux", __func__, sep->se_service); 1573 exit(EX_SOFTWARE); 1574 } 1575 if (!FD_ISSET(sep->se_fd, &allsock)) { 1576 syslog(LOG_ERR, 1577 "%s: %s: not on", __func__, sep->se_service); 1578 exit(EX_SOFTWARE); 1579 } 1580 if (nsock == 0) { 1581 syslog(LOG_ERR, "%s: nsock=0", __func__); 1582 exit(EX_SOFTWARE); 1583 } 1584 nsock--; 1585 #endif 1586 FD_CLR(sep->se_fd, &allsock); 1587 if (sep->se_fd == maxsock) 1588 maxsock--; 1589 } 1590 1591 static FILE *fconfig = NULL; 1592 static struct servtab serv; 1593 static char line[LINE_MAX]; 1594 1595 static int 1596 setconfig(void) 1597 { 1598 1599 if (fconfig != NULL) { 1600 fseek(fconfig, 0L, SEEK_SET); 1601 return (1); 1602 } 1603 fconfig = fopen(CONFIG, "r"); 1604 return (fconfig != NULL); 1605 } 1606 1607 static void 1608 endconfig(void) 1609 { 1610 if (fconfig) { 1611 (void) fclose(fconfig); 1612 fconfig = NULL; 1613 } 1614 } 1615 1616 static struct servtab * 1617 getconfigent(void) 1618 { 1619 struct servtab *sep = &serv; 1620 int argc; 1621 char *cp, *arg, *s; 1622 char *versp; 1623 static char TCPMUX_TOKEN[] = "tcpmux/"; 1624 #define MUX_LEN (sizeof(TCPMUX_TOKEN)-1) 1625 #ifdef IPSEC 1626 char *policy; 1627 #endif 1628 int v4bind; 1629 #ifdef INET6 1630 int v6bind; 1631 #endif 1632 int i; 1633 1634 #ifdef IPSEC 1635 policy = NULL; 1636 #endif 1637 more: 1638 v4bind = 0; 1639 #ifdef INET6 1640 v6bind = 0; 1641 #endif 1642 while ((cp = nextline(fconfig)) != NULL) { 1643 #ifdef IPSEC 1644 /* lines starting with #@ is not a comment, but the policy */ 1645 if (cp[0] == '#' && cp[1] == '@') { 1646 char *p; 1647 for (p = cp + 2; p && *p && isspace(*p); p++) 1648 ; 1649 if (*p == '\0') { 1650 if (policy) 1651 free(policy); 1652 policy = NULL; 1653 } else if (ipsec_get_policylen(p) >= 0) { 1654 if (policy) 1655 free(policy); 1656 policy = newstr(p); 1657 } else { 1658 syslog(LOG_ERR, 1659 "%s: invalid ipsec policy \"%s\"", 1660 CONFIG, p); 1661 exit(EX_CONFIG); 1662 } 1663 } 1664 #endif 1665 if (*cp == '#' || *cp == '\0') 1666 continue; 1667 break; 1668 } 1669 if (cp == NULL) 1670 return ((struct servtab *)0); 1671 /* 1672 * clear the static buffer, since some fields (se_ctrladdr, 1673 * for example) don't get initialized here. 1674 */ 1675 memset(sep, 0, sizeof *sep); 1676 arg = skip(&cp); 1677 if (cp == NULL) { 1678 /* got an empty line containing just blanks/tabs. */ 1679 goto more; 1680 } 1681 if (arg[0] == ':') { /* :user:group:perm: */ 1682 char *user, *group, *perm; 1683 struct passwd *pw; 1684 struct group *gr; 1685 user = arg+1; 1686 if ((group = strchr(user, ':')) == NULL) { 1687 syslog(LOG_ERR, "no group after user '%s'", user); 1688 goto more; 1689 } 1690 *group++ = '\0'; 1691 if ((perm = strchr(group, ':')) == NULL) { 1692 syslog(LOG_ERR, "no mode after group '%s'", group); 1693 goto more; 1694 } 1695 *perm++ = '\0'; 1696 if ((pw = getpwnam(user)) == NULL) { 1697 syslog(LOG_ERR, "no such user '%s'", user); 1698 goto more; 1699 } 1700 sep->se_sockuid = pw->pw_uid; 1701 if ((gr = getgrnam(group)) == NULL) { 1702 syslog(LOG_ERR, "no such user '%s'", group); 1703 goto more; 1704 } 1705 sep->se_sockgid = gr->gr_gid; 1706 sep->se_sockmode = strtol(perm, &arg, 8); 1707 if (*arg != ':') { 1708 syslog(LOG_ERR, "bad mode '%s'", perm); 1709 goto more; 1710 } 1711 *arg++ = '\0'; 1712 } else { 1713 sep->se_sockuid = euid; 1714 sep->se_sockgid = egid; 1715 sep->se_sockmode = 0200; 1716 } 1717 if (strncmp(arg, TCPMUX_TOKEN, MUX_LEN) == 0) { 1718 char *c = arg + MUX_LEN; 1719 if (*c == '+') { 1720 sep->se_type = MUXPLUS_TYPE; 1721 c++; 1722 } else 1723 sep->se_type = MUX_TYPE; 1724 sep->se_service = newstr(c); 1725 } else { 1726 sep->se_service = newstr(arg); 1727 sep->se_type = NORM_TYPE; 1728 } 1729 arg = sskip(&cp); 1730 if (strcmp(arg, "stream") == 0) 1731 sep->se_socktype = SOCK_STREAM; 1732 else if (strcmp(arg, "dgram") == 0) 1733 sep->se_socktype = SOCK_DGRAM; 1734 else if (strcmp(arg, "rdm") == 0) 1735 sep->se_socktype = SOCK_RDM; 1736 else if (strcmp(arg, "seqpacket") == 0) 1737 sep->se_socktype = SOCK_SEQPACKET; 1738 else if (strcmp(arg, "raw") == 0) 1739 sep->se_socktype = SOCK_RAW; 1740 else 1741 sep->se_socktype = -1; 1742 1743 arg = sskip(&cp); 1744 if (strncmp(arg, "tcp", 3) == 0) { 1745 sep->se_proto = newstr(strsep(&arg, "/")); 1746 if (arg != NULL && (strcmp(arg, "faith") == 0)) { 1747 syslog(LOG_ERR, "faith has been deprecated"); 1748 goto more; 1749 } 1750 } else { 1751 if (sep->se_type == NORM_TYPE && 1752 strncmp(arg, "faith/", 6) == 0) { 1753 syslog(LOG_ERR, "faith has been deprecated"); 1754 goto more; 1755 } 1756 sep->se_proto = newstr(arg); 1757 } 1758 if (strncmp(sep->se_proto, "rpc/", 4) == 0) { 1759 memmove(sep->se_proto, sep->se_proto + 4, 1760 strlen(sep->se_proto) + 1 - 4); 1761 sep->se_rpc = 1; 1762 sep->se_rpc_prog = sep->se_rpc_lowvers = 1763 sep->se_rpc_highvers = 0; 1764 if ((versp = strrchr(sep->se_service, '/'))) { 1765 *versp++ = '\0'; 1766 switch (sscanf(versp, "%u-%u", 1767 &sep->se_rpc_lowvers, 1768 &sep->se_rpc_highvers)) { 1769 case 2: 1770 break; 1771 case 1: 1772 sep->se_rpc_highvers = 1773 sep->se_rpc_lowvers; 1774 break; 1775 default: 1776 syslog(LOG_ERR, 1777 "bad RPC version specifier; %s", 1778 sep->se_service); 1779 freeconfig(sep); 1780 goto more; 1781 } 1782 } 1783 else { 1784 sep->se_rpc_lowvers = 1785 sep->se_rpc_highvers = 1; 1786 } 1787 } 1788 sep->se_nomapped = 0; 1789 if (strcmp(sep->se_proto, "unix") == 0) { 1790 sep->se_family = AF_UNIX; 1791 } else { 1792 while (isdigit(sep->se_proto[strlen(sep->se_proto) - 1])) { 1793 #ifdef INET6 1794 if (sep->se_proto[strlen(sep->se_proto) - 1] == '6') { 1795 sep->se_proto[strlen(sep->se_proto) - 1] = '\0'; 1796 v6bind = 1; 1797 continue; 1798 } 1799 #endif 1800 if (sep->se_proto[strlen(sep->se_proto) - 1] == '4') { 1801 sep->se_proto[strlen(sep->se_proto) - 1] = '\0'; 1802 v4bind = 1; 1803 continue; 1804 } 1805 /* illegal version num */ 1806 syslog(LOG_ERR, "bad IP version for %s", sep->se_proto); 1807 freeconfig(sep); 1808 goto more; 1809 } 1810 #ifdef INET6 1811 if (v6bind && !v6bind_ok) { 1812 syslog(LOG_INFO, "IPv6 bind is ignored for %s", 1813 sep->se_service); 1814 if (v4bind && v4bind_ok) 1815 v6bind = 0; 1816 else { 1817 freeconfig(sep); 1818 goto more; 1819 } 1820 } 1821 if (v6bind) { 1822 sep->se_family = AF_INET6; 1823 if (!v4bind || !v4bind_ok) 1824 sep->se_nomapped = 1; 1825 } else 1826 #endif 1827 { /* default to v4 bind if not v6 bind */ 1828 if (!v4bind_ok) { 1829 syslog(LOG_NOTICE, "IPv4 bind is ignored for %s", 1830 sep->se_service); 1831 freeconfig(sep); 1832 goto more; 1833 } 1834 sep->se_family = AF_INET; 1835 } 1836 } 1837 /* init ctladdr */ 1838 switch(sep->se_family) { 1839 case AF_INET: 1840 memcpy(&sep->se_ctrladdr4, bind_sa4, 1841 sizeof(sep->se_ctrladdr4)); 1842 sep->se_ctrladdr_size = sizeof(sep->se_ctrladdr4); 1843 break; 1844 #ifdef INET6 1845 case AF_INET6: 1846 memcpy(&sep->se_ctrladdr6, bind_sa6, 1847 sizeof(sep->se_ctrladdr6)); 1848 sep->se_ctrladdr_size = sizeof(sep->se_ctrladdr6); 1849 break; 1850 #endif 1851 case AF_UNIX: 1852 if (strlen(sep->se_service) >= sizeof(sep->se_ctrladdr_un.sun_path)) { 1853 syslog(LOG_ERR, 1854 "domain socket pathname too long for service %s", 1855 sep->se_service); 1856 goto more; 1857 } 1858 memset(&sep->se_ctrladdr, 0, sizeof(sep->se_ctrladdr)); 1859 sep->se_ctrladdr_un.sun_family = sep->se_family; 1860 sep->se_ctrladdr_un.sun_len = strlen(sep->se_service); 1861 strcpy(sep->se_ctrladdr_un.sun_path, sep->se_service); 1862 sep->se_ctrladdr_size = SUN_LEN(&sep->se_ctrladdr_un); 1863 } 1864 arg = sskip(&cp); 1865 if (!strncmp(arg, "wait", 4)) 1866 sep->se_accept = 0; 1867 else if (!strncmp(arg, "nowait", 6)) 1868 sep->se_accept = 1; 1869 else { 1870 syslog(LOG_ERR, 1871 "%s: bad wait/nowait for service %s", 1872 CONFIG, sep->se_service); 1873 goto more; 1874 } 1875 sep->se_maxchild = -1; 1876 sep->se_maxcpm = -1; 1877 sep->se_maxperip = -1; 1878 if ((s = strchr(arg, '/')) != NULL) { 1879 char *eptr; 1880 u_long val; 1881 1882 val = strtoul(s + 1, &eptr, 10); 1883 if (eptr == s + 1 || val > MAX_MAXCHLD) { 1884 syslog(LOG_ERR, 1885 "%s: bad max-child for service %s", 1886 CONFIG, sep->se_service); 1887 goto more; 1888 } 1889 if (debug) 1890 if (!sep->se_accept && val != 1) 1891 warnx("maxchild=%lu for wait service %s" 1892 " not recommended", val, sep->se_service); 1893 sep->se_maxchild = val; 1894 if (*eptr == '/') 1895 sep->se_maxcpm = strtol(eptr + 1, &eptr, 10); 1896 if (*eptr == '/') 1897 sep->se_maxperip = strtol(eptr + 1, &eptr, 10); 1898 /* 1899 * explicitly do not check for \0 for future expansion / 1900 * backwards compatibility 1901 */ 1902 } 1903 if (ISMUX(sep)) { 1904 /* 1905 * Silently enforce "nowait" mode for TCPMUX services 1906 * since they don't have an assigned port to listen on. 1907 */ 1908 sep->se_accept = 1; 1909 if (strcmp(sep->se_proto, "tcp")) { 1910 syslog(LOG_ERR, 1911 "%s: bad protocol for tcpmux service %s", 1912 CONFIG, sep->se_service); 1913 goto more; 1914 } 1915 if (sep->se_socktype != SOCK_STREAM) { 1916 syslog(LOG_ERR, 1917 "%s: bad socket type for tcpmux service %s", 1918 CONFIG, sep->se_service); 1919 goto more; 1920 } 1921 } 1922 sep->se_user = newstr(sskip(&cp)); 1923 #ifdef LOGIN_CAP 1924 if ((s = strrchr(sep->se_user, '/')) != NULL) { 1925 *s = '\0'; 1926 sep->se_class = newstr(s + 1); 1927 } else 1928 sep->se_class = newstr(RESOURCE_RC); 1929 #endif 1930 if ((s = strrchr(sep->se_user, ':')) != NULL) { 1931 *s = '\0'; 1932 sep->se_group = newstr(s + 1); 1933 } else 1934 sep->se_group = NULL; 1935 sep->se_server = newstr(sskip(&cp)); 1936 if ((sep->se_server_name = strrchr(sep->se_server, '/'))) 1937 sep->se_server_name++; 1938 if (strcmp(sep->se_server, "internal") == 0) { 1939 struct biltin *bi; 1940 1941 for (bi = biltins; bi->bi_service; bi++) 1942 if (bi->bi_socktype == sep->se_socktype && 1943 matchservent(bi->bi_service, sep->se_service, 1944 sep->se_proto)) 1945 break; 1946 if (bi->bi_service == 0) { 1947 syslog(LOG_ERR, "internal service %s unknown", 1948 sep->se_service); 1949 goto more; 1950 } 1951 sep->se_accept = 1; /* force accept mode for built-ins */ 1952 sep->se_bi = bi; 1953 } else 1954 sep->se_bi = NULL; 1955 if (sep->se_maxperip < 0) 1956 sep->se_maxperip = maxperip; 1957 if (sep->se_maxcpm < 0) 1958 sep->se_maxcpm = maxcpm; 1959 if (sep->se_maxchild < 0) { /* apply default max-children */ 1960 if (sep->se_bi && sep->se_bi->bi_maxchild >= 0) 1961 sep->se_maxchild = sep->se_bi->bi_maxchild; 1962 else if (sep->se_accept) 1963 sep->se_maxchild = MAX(maxchild, 0); 1964 else 1965 sep->se_maxchild = 1; 1966 } 1967 if (sep->se_maxchild > 0) { 1968 sep->se_pids = malloc(sep->se_maxchild * sizeof(*sep->se_pids)); 1969 if (sep->se_pids == NULL) { 1970 syslog(LOG_ERR, "malloc: %m"); 1971 exit(EX_OSERR); 1972 } 1973 } 1974 argc = 0; 1975 for (arg = skip(&cp); cp; arg = skip(&cp)) 1976 if (argc < MAXARGV) { 1977 sep->se_argv[argc++] = newstr(arg); 1978 } else { 1979 syslog(LOG_ERR, 1980 "%s: too many arguments for service %s", 1981 CONFIG, sep->se_service); 1982 goto more; 1983 } 1984 while (argc <= MAXARGV) 1985 sep->se_argv[argc++] = NULL; 1986 for (i = 0; i < PERIPSIZE; ++i) 1987 LIST_INIT(&sep->se_conn[i]); 1988 #ifdef IPSEC 1989 sep->se_policy = policy ? newstr(policy) : NULL; 1990 #endif 1991 return (sep); 1992 } 1993 1994 static void 1995 freeconfig(struct servtab *cp) 1996 { 1997 int i; 1998 1999 if (cp->se_service) 2000 free(cp->se_service); 2001 if (cp->se_proto) 2002 free(cp->se_proto); 2003 if (cp->se_user) 2004 free(cp->se_user); 2005 if (cp->se_group) 2006 free(cp->se_group); 2007 #ifdef LOGIN_CAP 2008 if (cp->se_class) 2009 free(cp->se_class); 2010 #endif 2011 if (cp->se_server) 2012 free(cp->se_server); 2013 if (cp->se_pids) 2014 free(cp->se_pids); 2015 for (i = 0; i < MAXARGV; i++) 2016 if (cp->se_argv[i]) 2017 free(cp->se_argv[i]); 2018 free_connlist(cp); 2019 #ifdef IPSEC 2020 if (cp->se_policy) 2021 free(cp->se_policy); 2022 #endif 2023 } 2024 2025 2026 /* 2027 * Safe skip - if skip returns null, log a syntax error in the 2028 * configuration file and exit. 2029 */ 2030 static char * 2031 sskip(char **cpp) 2032 { 2033 char *cp; 2034 2035 cp = skip(cpp); 2036 if (cp == NULL) { 2037 syslog(LOG_ERR, "%s: syntax error", CONFIG); 2038 exit(EX_DATAERR); 2039 } 2040 return (cp); 2041 } 2042 2043 static char * 2044 skip(char **cpp) 2045 { 2046 char *cp = *cpp; 2047 char *start; 2048 char quote = '\0'; 2049 2050 again: 2051 while (*cp == ' ' || *cp == '\t') 2052 cp++; 2053 if (*cp == '\0') { 2054 int c; 2055 2056 c = getc(fconfig); 2057 (void) ungetc(c, fconfig); 2058 if (c == ' ' || c == '\t') 2059 if ((cp = nextline(fconfig))) 2060 goto again; 2061 *cpp = (char *)0; 2062 return ((char *)0); 2063 } 2064 if (*cp == '"' || *cp == '\'') 2065 quote = *cp++; 2066 start = cp; 2067 if (quote) 2068 while (*cp && *cp != quote) 2069 cp++; 2070 else 2071 while (*cp && *cp != ' ' && *cp != '\t') 2072 cp++; 2073 if (*cp != '\0') 2074 *cp++ = '\0'; 2075 *cpp = cp; 2076 return (start); 2077 } 2078 2079 static char * 2080 nextline(FILE *fd) 2081 { 2082 char *cp; 2083 2084 if (fgets(line, sizeof (line), fd) == NULL) 2085 return ((char *)0); 2086 cp = strchr(line, '\n'); 2087 if (cp) 2088 *cp = '\0'; 2089 return (line); 2090 } 2091 2092 static char * 2093 newstr(const char *cp) 2094 { 2095 char *cr; 2096 2097 if ((cr = strdup(cp != NULL ? cp : ""))) 2098 return (cr); 2099 syslog(LOG_ERR, "strdup: %m"); 2100 exit(EX_OSERR); 2101 } 2102 2103 void 2104 inetd_setproctitle(const char *a, int s) 2105 { 2106 socklen_t size; 2107 struct sockaddr_storage ss; 2108 char buf[80], pbuf[NI_MAXHOST]; 2109 2110 size = sizeof(ss); 2111 if (getpeername(s, (struct sockaddr *)&ss, &size) == 0) { 2112 getnameinfo((struct sockaddr *)&ss, size, pbuf, sizeof(pbuf), 2113 NULL, 0, NI_NUMERICHOST); 2114 (void) sprintf(buf, "%s [%s]", a, pbuf); 2115 } else 2116 (void) sprintf(buf, "%s", a); 2117 setproctitle("%s", buf); 2118 } 2119 2120 int 2121 check_loop(const struct sockaddr *sa, const struct servtab *sep) 2122 { 2123 struct servtab *se2; 2124 char pname[NI_MAXHOST]; 2125 2126 for (se2 = servtab; se2; se2 = se2->se_next) { 2127 if (!se2->se_bi || se2->se_socktype != SOCK_DGRAM) 2128 continue; 2129 2130 switch (se2->se_family) { 2131 case AF_INET: 2132 if (csatosin(sa)->sin_port == 2133 se2->se_ctrladdr4.sin_port) 2134 goto isloop; 2135 continue; 2136 #ifdef INET6 2137 case AF_INET6: 2138 if (csatosin6(sa)->sin6_port == 2139 se2->se_ctrladdr6.sin6_port) 2140 goto isloop; 2141 continue; 2142 #endif 2143 default: 2144 continue; 2145 } 2146 isloop: 2147 getnameinfo(sa, sa->sa_len, pname, sizeof(pname), NULL, 0, 2148 NI_NUMERICHOST); 2149 syslog(LOG_WARNING, "%s/%s:%s/%s loop request REFUSED from %s", 2150 sep->se_service, sep->se_proto, 2151 se2->se_service, se2->se_proto, 2152 pname); 2153 return 1; 2154 } 2155 return 0; 2156 } 2157 2158 /* 2159 * print_service: 2160 * Dump relevant information to stderr 2161 */ 2162 static void 2163 print_service(const char *action, const struct servtab *sep) 2164 { 2165 fprintf(stderr, 2166 "%s: %s proto=%s accept=%d max=%d user=%s group=%s" 2167 #ifdef LOGIN_CAP 2168 "class=%s" 2169 #endif 2170 " builtin=%p server=%s" 2171 #ifdef IPSEC 2172 " policy=\"%s\"" 2173 #endif 2174 "\n", 2175 action, sep->se_service, sep->se_proto, 2176 sep->se_accept, sep->se_maxchild, sep->se_user, sep->se_group, 2177 #ifdef LOGIN_CAP 2178 sep->se_class, 2179 #endif 2180 (void *) sep->se_bi, sep->se_server 2181 #ifdef IPSEC 2182 , (sep->se_policy ? sep->se_policy : "") 2183 #endif 2184 ); 2185 } 2186 2187 #define CPMHSIZE 256 2188 #define CPMHMASK (CPMHSIZE-1) 2189 #define CHTGRAN 10 2190 #define CHTSIZE 6 2191 2192 typedef struct CTime { 2193 unsigned long ct_Ticks; 2194 int ct_Count; 2195 } CTime; 2196 2197 typedef struct CHash { 2198 union { 2199 struct in_addr c4_Addr; 2200 struct in6_addr c6_Addr; 2201 } cu_Addr; 2202 #define ch_Addr4 cu_Addr.c4_Addr 2203 #define ch_Addr6 cu_Addr.c6_Addr 2204 int ch_Family; 2205 time_t ch_LTime; 2206 char *ch_Service; 2207 CTime ch_Times[CHTSIZE]; 2208 } CHash; 2209 2210 static CHash CHashAry[CPMHSIZE]; 2211 2212 static int 2213 cpmip(const struct servtab *sep, int ctrl) 2214 { 2215 struct sockaddr_storage rss; 2216 socklen_t rssLen = sizeof(rss); 2217 int r = 0; 2218 2219 /* 2220 * If getpeername() fails, just let it through (if logging is 2221 * enabled the condition is caught elsewhere) 2222 */ 2223 2224 if (sep->se_maxcpm > 0 && 2225 (sep->se_family == AF_INET || sep->se_family == AF_INET6) && 2226 getpeername(ctrl, (struct sockaddr *)&rss, &rssLen) == 0 ) { 2227 time_t t = time(NULL); 2228 int hv = 0xABC3D20F; 2229 int i; 2230 int cnt = 0; 2231 CHash *chBest = NULL; 2232 unsigned int ticks = t / CHTGRAN; 2233 struct sockaddr_in *sin4; 2234 #ifdef INET6 2235 struct sockaddr_in6 *sin6; 2236 #endif 2237 2238 sin4 = (struct sockaddr_in *)&rss; 2239 #ifdef INET6 2240 sin6 = (struct sockaddr_in6 *)&rss; 2241 #endif 2242 { 2243 char *p; 2244 int addrlen; 2245 2246 switch (rss.ss_family) { 2247 case AF_INET: 2248 p = (char *)&sin4->sin_addr; 2249 addrlen = sizeof(struct in_addr); 2250 break; 2251 #ifdef INET6 2252 case AF_INET6: 2253 p = (char *)&sin6->sin6_addr; 2254 addrlen = sizeof(struct in6_addr); 2255 break; 2256 #endif 2257 default: 2258 /* should not happen */ 2259 return -1; 2260 } 2261 2262 for (i = 0; i < addrlen; ++i, ++p) { 2263 hv = (hv << 5) ^ (hv >> 23) ^ *p; 2264 } 2265 hv = (hv ^ (hv >> 16)); 2266 } 2267 for (i = 0; i < 5; ++i) { 2268 CHash *ch = &CHashAry[(hv + i) & CPMHMASK]; 2269 2270 if (rss.ss_family == AF_INET && 2271 ch->ch_Family == AF_INET && 2272 sin4->sin_addr.s_addr == ch->ch_Addr4.s_addr && 2273 ch->ch_Service && strcmp(sep->se_service, 2274 ch->ch_Service) == 0) { 2275 chBest = ch; 2276 break; 2277 } 2278 #ifdef INET6 2279 if (rss.ss_family == AF_INET6 && 2280 ch->ch_Family == AF_INET6 && 2281 IN6_ARE_ADDR_EQUAL(&sin6->sin6_addr, 2282 &ch->ch_Addr6) != 0 && 2283 ch->ch_Service && strcmp(sep->se_service, 2284 ch->ch_Service) == 0) { 2285 chBest = ch; 2286 break; 2287 } 2288 #endif 2289 if (chBest == NULL || ch->ch_LTime == 0 || 2290 ch->ch_LTime < chBest->ch_LTime) { 2291 chBest = ch; 2292 } 2293 } 2294 if ((rss.ss_family == AF_INET && 2295 (chBest->ch_Family != AF_INET || 2296 sin4->sin_addr.s_addr != chBest->ch_Addr4.s_addr)) || 2297 chBest->ch_Service == NULL || 2298 strcmp(sep->se_service, chBest->ch_Service) != 0) { 2299 chBest->ch_Family = sin4->sin_family; 2300 chBest->ch_Addr4 = sin4->sin_addr; 2301 if (chBest->ch_Service) 2302 free(chBest->ch_Service); 2303 chBest->ch_Service = strdup(sep->se_service); 2304 bzero(chBest->ch_Times, sizeof(chBest->ch_Times)); 2305 } 2306 #ifdef INET6 2307 if ((rss.ss_family == AF_INET6 && 2308 (chBest->ch_Family != AF_INET6 || 2309 IN6_ARE_ADDR_EQUAL(&sin6->sin6_addr, 2310 &chBest->ch_Addr6) == 0)) || 2311 chBest->ch_Service == NULL || 2312 strcmp(sep->se_service, chBest->ch_Service) != 0) { 2313 chBest->ch_Family = sin6->sin6_family; 2314 chBest->ch_Addr6 = sin6->sin6_addr; 2315 if (chBest->ch_Service) 2316 free(chBest->ch_Service); 2317 chBest->ch_Service = strdup(sep->se_service); 2318 bzero(chBest->ch_Times, sizeof(chBest->ch_Times)); 2319 } 2320 #endif 2321 chBest->ch_LTime = t; 2322 { 2323 CTime *ct = &chBest->ch_Times[ticks % CHTSIZE]; 2324 if (ct->ct_Ticks != ticks) { 2325 ct->ct_Ticks = ticks; 2326 ct->ct_Count = 0; 2327 } 2328 ++ct->ct_Count; 2329 } 2330 for (i = 0; i < CHTSIZE; ++i) { 2331 CTime *ct = &chBest->ch_Times[i]; 2332 if (ct->ct_Ticks <= ticks && 2333 ct->ct_Ticks >= ticks - CHTSIZE) { 2334 cnt += ct->ct_Count; 2335 } 2336 } 2337 if ((cnt * 60) / (CHTSIZE * CHTGRAN) > sep->se_maxcpm) { 2338 char pname[NI_MAXHOST]; 2339 2340 getnameinfo((struct sockaddr *)&rss, 2341 ((struct sockaddr *)&rss)->sa_len, 2342 pname, sizeof(pname), NULL, 0, 2343 NI_NUMERICHOST); 2344 r = -1; 2345 syslog(LOG_ERR, 2346 "%s from %s exceeded counts/min (limit %d/min)", 2347 sep->se_service, pname, 2348 sep->se_maxcpm); 2349 } 2350 } 2351 return(r); 2352 } 2353 2354 static struct conninfo * 2355 search_conn(struct servtab *sep, int ctrl) 2356 { 2357 struct sockaddr_storage ss; 2358 socklen_t sslen = sizeof(ss); 2359 struct conninfo *conn; 2360 int hv; 2361 char pname[NI_MAXHOST], pname2[NI_MAXHOST]; 2362 2363 if (sep->se_maxperip <= 0) 2364 return NULL; 2365 2366 /* 2367 * If getpeername() fails, just let it through (if logging is 2368 * enabled the condition is caught elsewhere) 2369 */ 2370 if (getpeername(ctrl, (struct sockaddr *)&ss, &sslen) != 0) 2371 return NULL; 2372 2373 switch (ss.ss_family) { 2374 case AF_INET: 2375 hv = hashval((char *)&((struct sockaddr_in *)&ss)->sin_addr, 2376 sizeof(struct in_addr)); 2377 break; 2378 #ifdef INET6 2379 case AF_INET6: 2380 hv = hashval((char *)&((struct sockaddr_in6 *)&ss)->sin6_addr, 2381 sizeof(struct in6_addr)); 2382 break; 2383 #endif 2384 default: 2385 /* 2386 * Since we only support AF_INET and AF_INET6, just 2387 * let other than AF_INET and AF_INET6 through. 2388 */ 2389 return NULL; 2390 } 2391 2392 if (getnameinfo((struct sockaddr *)&ss, sslen, pname, sizeof(pname), 2393 NULL, 0, NI_NUMERICHOST) != 0) 2394 return NULL; 2395 2396 LIST_FOREACH(conn, &sep->se_conn[hv], co_link) { 2397 if (getnameinfo((struct sockaddr *)&conn->co_addr, 2398 conn->co_addr.ss_len, pname2, sizeof(pname2), NULL, 0, 2399 NI_NUMERICHOST) == 0 && 2400 strcmp(pname, pname2) == 0) 2401 break; 2402 } 2403 2404 if (conn == NULL) { 2405 if ((conn = malloc(sizeof(struct conninfo))) == NULL) { 2406 syslog(LOG_ERR, "malloc: %m"); 2407 exit(EX_OSERR); 2408 } 2409 conn->co_proc = malloc(sep->se_maxperip * sizeof(*conn->co_proc)); 2410 if (conn->co_proc == NULL) { 2411 syslog(LOG_ERR, "malloc: %m"); 2412 exit(EX_OSERR); 2413 } 2414 memcpy(&conn->co_addr, (struct sockaddr *)&ss, sslen); 2415 conn->co_numchild = 0; 2416 LIST_INSERT_HEAD(&sep->se_conn[hv], conn, co_link); 2417 } 2418 2419 /* 2420 * Since a child process is not invoked yet, we cannot 2421 * determine a pid of a child. So, co_proc and co_numchild 2422 * should be filled leter. 2423 */ 2424 2425 return conn; 2426 } 2427 2428 static int 2429 room_conn(struct servtab *sep, struct conninfo *conn) 2430 { 2431 char pname[NI_MAXHOST]; 2432 2433 if (conn->co_numchild >= sep->se_maxperip) { 2434 getnameinfo((struct sockaddr *)&conn->co_addr, 2435 conn->co_addr.ss_len, pname, sizeof(pname), NULL, 0, 2436 NI_NUMERICHOST); 2437 syslog(LOG_ERR, "%s from %s exceeded counts (limit %d)", 2438 sep->se_service, pname, sep->se_maxperip); 2439 return 0; 2440 } 2441 return 1; 2442 } 2443 2444 static void 2445 addchild_conn(struct conninfo *conn, pid_t pid) 2446 { 2447 struct procinfo *proc; 2448 2449 if (conn == NULL) 2450 return; 2451 2452 if ((proc = search_proc(pid, 1)) != NULL) { 2453 if (proc->pr_conn != NULL) { 2454 syslog(LOG_ERR, 2455 "addchild_conn: child already on process list"); 2456 exit(EX_OSERR); 2457 } 2458 proc->pr_conn = conn; 2459 } 2460 2461 conn->co_proc[conn->co_numchild++] = proc; 2462 } 2463 2464 static void 2465 reapchild_conn(pid_t pid) 2466 { 2467 struct procinfo *proc; 2468 struct conninfo *conn; 2469 int i; 2470 2471 if ((proc = search_proc(pid, 0)) == NULL) 2472 return; 2473 if ((conn = proc->pr_conn) == NULL) 2474 return; 2475 for (i = 0; i < conn->co_numchild; ++i) 2476 if (conn->co_proc[i] == proc) { 2477 conn->co_proc[i] = conn->co_proc[--conn->co_numchild]; 2478 break; 2479 } 2480 free_proc(proc); 2481 free_conn(conn); 2482 } 2483 2484 static void 2485 resize_conn(struct servtab *sep, int maxpip) 2486 { 2487 struct conninfo *conn; 2488 int i, j; 2489 2490 if (sep->se_maxperip <= 0) 2491 return; 2492 if (maxpip <= 0) { 2493 free_connlist(sep); 2494 return; 2495 } 2496 for (i = 0; i < PERIPSIZE; ++i) { 2497 LIST_FOREACH(conn, &sep->se_conn[i], co_link) { 2498 for (j = maxpip; j < conn->co_numchild; ++j) 2499 free_proc(conn->co_proc[j]); 2500 conn->co_proc = realloc(conn->co_proc, 2501 maxpip * sizeof(*conn->co_proc)); 2502 if (conn->co_proc == NULL) { 2503 syslog(LOG_ERR, "realloc: %m"); 2504 exit(EX_OSERR); 2505 } 2506 if (conn->co_numchild > maxpip) 2507 conn->co_numchild = maxpip; 2508 } 2509 } 2510 } 2511 2512 static void 2513 free_connlist(struct servtab *sep) 2514 { 2515 struct conninfo *conn; 2516 int i, j; 2517 2518 for (i = 0; i < PERIPSIZE; ++i) { 2519 while ((conn = LIST_FIRST(&sep->se_conn[i])) != NULL) { 2520 for (j = 0; j < conn->co_numchild; ++j) 2521 free_proc(conn->co_proc[j]); 2522 conn->co_numchild = 0; 2523 free_conn(conn); 2524 } 2525 } 2526 } 2527 2528 static void 2529 free_conn(struct conninfo *conn) 2530 { 2531 if (conn == NULL) 2532 return; 2533 if (conn->co_numchild <= 0) { 2534 LIST_REMOVE(conn, co_link); 2535 free(conn->co_proc); 2536 free(conn); 2537 } 2538 } 2539 2540 static struct procinfo * 2541 search_proc(pid_t pid, int add) 2542 { 2543 struct procinfo *proc; 2544 int hv; 2545 2546 hv = hashval((char *)&pid, sizeof(pid)); 2547 LIST_FOREACH(proc, &proctable[hv], pr_link) { 2548 if (proc->pr_pid == pid) 2549 break; 2550 } 2551 if (proc == NULL && add) { 2552 if ((proc = malloc(sizeof(struct procinfo))) == NULL) { 2553 syslog(LOG_ERR, "malloc: %m"); 2554 exit(EX_OSERR); 2555 } 2556 proc->pr_pid = pid; 2557 proc->pr_conn = NULL; 2558 LIST_INSERT_HEAD(&proctable[hv], proc, pr_link); 2559 } 2560 return proc; 2561 } 2562 2563 static void 2564 free_proc(struct procinfo *proc) 2565 { 2566 if (proc == NULL) 2567 return; 2568 LIST_REMOVE(proc, pr_link); 2569 free(proc); 2570 } 2571 2572 static int 2573 hashval(char *p, int len) 2574 { 2575 int i, hv = 0xABC3D20F; 2576 2577 for (i = 0; i < len; ++i, ++p) 2578 hv = (hv << 5) ^ (hv >> 23) ^ *p; 2579 hv = (hv ^ (hv >> 16)) & (PERIPSIZE - 1); 2580 return hv; 2581 } 2582