1 /*- 2 * SPDX-License-Identifier: BSD-3-Clause 3 * 4 * Copyright (c) 1983, 1991, 1993, 1994 5 * The Regents of the University of California. All rights reserved. 6 * 7 * Redistribution and use in source and binary forms, with or without 8 * modification, are permitted provided that the following conditions 9 * are met: 10 * 1. Redistributions of source code must retain the above copyright 11 * notice, this list of conditions and the following disclaimer. 12 * 2. Redistributions in binary form must reproduce the above copyright 13 * notice, this list of conditions and the following disclaimer in the 14 * documentation and/or other materials provided with the distribution. 15 * 3. Neither the name of the University nor the names of its contributors 16 * may be used to endorse or promote products derived from this software 17 * without specific prior written permission. 18 * 19 * THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND 20 * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE 21 * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE 22 * ARE DISCLAIMED. IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE 23 * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL 24 * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS 25 * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) 26 * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT 27 * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY 28 * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF 29 * SUCH DAMAGE. 30 */ 31 32 /* 33 * Inetd - Internet super-server 34 * 35 * This program invokes all internet services as needed. Connection-oriented 36 * services are invoked each time a connection is made, by creating a process. 37 * This process is passed the connection as file descriptor 0 and is expected 38 * to do a getpeername to find out the source host and port. 39 * 40 * Datagram oriented services are invoked when a datagram 41 * arrives; a process is created and passed a pending message 42 * on file descriptor 0. Datagram servers may either connect 43 * to their peer, freeing up the original socket for inetd 44 * to receive further messages on, or ``take over the socket'', 45 * processing all arriving datagrams and, eventually, timing 46 * out. The first type of server is said to be ``multi-threaded''; 47 * the second type of server ``single-threaded''. 48 * 49 * Inetd uses a configuration file which is read at startup 50 * and, possibly, at some later time in response to a hangup signal. 51 * The configuration file is ``free format'' with fields given in the 52 * order shown below. Continuation lines for an entry must begin with 53 * a space or tab. All fields must be present in each entry. 54 * 55 * service name must be in /etc/services 56 * or name a tcpmux service 57 * or specify a unix domain socket 58 * socket type stream/dgram/raw/rdm/seqpacket 59 * protocol tcp[4][6], udp[4][6], unix 60 * wait/nowait single-threaded/multi-threaded 61 * user[:group][/login-class] user/group/login-class to run daemon as 62 * server program full path name 63 * server program arguments maximum of MAXARGS (20) 64 * 65 * TCP services without official port numbers are handled with the 66 * RFC1078-based tcpmux internal service. Tcpmux listens on port 1 for 67 * requests. When a connection is made from a foreign host, the service 68 * requested is passed to tcpmux, which looks it up in the servtab list 69 * and returns the proper entry for the service. Tcpmux returns a 70 * negative reply if the service doesn't exist, otherwise the invoked 71 * server is expected to return the positive reply if the service type in 72 * inetd.conf file has the prefix "tcpmux/". If the service type has the 73 * prefix "tcpmux/+", tcpmux will return the positive reply for the 74 * process; this is for compatibility with older server code, and also 75 * allows you to invoke programs that use stdin/stdout without putting any 76 * special server code in them. Services that use tcpmux are "nowait" 77 * because they do not have a well-known port and hence cannot listen 78 * for new requests. 79 * 80 * For RPC services 81 * service name/version must be in /etc/rpc 82 * socket type stream/dgram/raw/rdm/seqpacket 83 * protocol rpc/tcp[4][6], rpc/udp[4][6] 84 * wait/nowait single-threaded/multi-threaded 85 * user[:group][/login-class] user/group/login-class to run daemon as 86 * server program full path name 87 * server program arguments maximum of MAXARGS 88 * 89 * Comment lines are indicated by a `#' in column 1. 90 * 91 * #ifdef IPSEC 92 * Comment lines that start with "#@" denote IPsec policy string, as described 93 * in ipsec_set_policy(3). This will affect all the following items in 94 * inetd.conf(8). To reset the policy, just use "#@" line. By default, 95 * there's no IPsec policy. 96 * #endif 97 */ 98 #include <sys/param.h> 99 #include <sys/ioctl.h> 100 #include <sys/mman.h> 101 #include <sys/wait.h> 102 #include <sys/time.h> 103 #include <sys/resource.h> 104 #include <sys/stat.h> 105 #include <sys/un.h> 106 107 #include <netinet/in.h> 108 #include <netinet/tcp.h> 109 #include <arpa/inet.h> 110 #include <rpc/rpc.h> 111 #include <rpc/pmap_clnt.h> 112 113 #include <ctype.h> 114 #include <errno.h> 115 #include <err.h> 116 #include <fcntl.h> 117 #include <grp.h> 118 #include <libutil.h> 119 #include <limits.h> 120 #include <netdb.h> 121 #include <pwd.h> 122 #include <signal.h> 123 #include <stdio.h> 124 #include <stdlib.h> 125 #include <string.h> 126 #include <sysexits.h> 127 #include <syslog.h> 128 #ifdef LIBWRAP 129 #include <tcpd.h> 130 #endif 131 #include <unistd.h> 132 133 #include "inetd.h" 134 #include "pathnames.h" 135 136 #ifdef IPSEC 137 #include <netipsec/ipsec.h> 138 #ifndef IPSEC_POLICY_IPSEC /* no ipsec support on old ipsec */ 139 #undef IPSEC 140 #endif 141 #endif 142 143 #ifndef LIBWRAP_ALLOW_FACILITY 144 # define LIBWRAP_ALLOW_FACILITY LOG_AUTH 145 #endif 146 #ifndef LIBWRAP_ALLOW_SEVERITY 147 # define LIBWRAP_ALLOW_SEVERITY LOG_INFO 148 #endif 149 #ifndef LIBWRAP_DENY_FACILITY 150 # define LIBWRAP_DENY_FACILITY LOG_AUTH 151 #endif 152 #ifndef LIBWRAP_DENY_SEVERITY 153 # define LIBWRAP_DENY_SEVERITY LOG_WARNING 154 #endif 155 156 #define ISWRAP(sep) \ 157 ( ((wrap_ex && !(sep)->se_bi) || (wrap_bi && (sep)->se_bi)) \ 158 && (sep->se_family == AF_INET || sep->se_family == AF_INET6) \ 159 && ( ((sep)->se_accept && (sep)->se_socktype == SOCK_STREAM) \ 160 || (sep)->se_socktype == SOCK_DGRAM)) 161 162 #ifdef LOGIN_CAP 163 #include <login_cap.h> 164 165 /* see init.c */ 166 #define RESOURCE_RC "daemon" 167 168 #endif 169 170 #ifndef MAXCHILD 171 #define MAXCHILD -1 /* maximum number of this service 172 < 0 = no limit */ 173 #endif 174 175 #ifndef MAXCPM 176 #define MAXCPM -1 /* rate limit invocations from a 177 single remote address, 178 < 0 = no limit */ 179 #endif 180 181 #ifndef MAXPERIP 182 #define MAXPERIP -1 /* maximum number of this service 183 from a single remote address, 184 < 0 = no limit */ 185 #endif 186 187 #ifndef TOOMANY 188 #define TOOMANY 256 /* don't start more than TOOMANY */ 189 #endif 190 #define CNT_INTVL 60 /* servers in CNT_INTVL sec. */ 191 #define RETRYTIME (60*10) /* retry after bind or server fail */ 192 #define MAX_MAXCHLD 32767 /* max allowable max children */ 193 194 #define SIGBLOCK (sigmask(SIGCHLD)|sigmask(SIGHUP)|sigmask(SIGALRM)) 195 196 #define satosin(sa) ((struct sockaddr_in *)(void *)sa) 197 #define csatosin(sa) ((const struct sockaddr_in *)(const void *)sa) 198 #ifdef INET6 199 #define satosin6(sa) ((struct sockaddr_in6 *)(void *)sa) 200 #define csatosin6(sa) ((const struct sockaddr_in6 *)(const void *)sa) 201 #endif 202 static void close_sep(struct servtab *); 203 static void flag_signal(int); 204 static void config(void); 205 static int cpmip(const struct servtab *, int); 206 static void endconfig(void); 207 static struct servtab *enter(struct servtab *); 208 static void freeconfig(struct servtab *); 209 static struct servtab *getconfigent(void); 210 static int matchservent(const char *, const char *, const char *); 211 static char *nextline(FILE *); 212 static void addchild(struct servtab *, int); 213 static void reapchild(void); 214 static void enable(struct servtab *); 215 static void disable(struct servtab *); 216 static void retry(void); 217 static int setconfig(void); 218 static void setup(struct servtab *); 219 #ifdef IPSEC 220 static void ipsecsetup(struct servtab *); 221 #endif 222 static void unregisterrpc(register struct servtab *sep); 223 static struct conninfo *search_conn(struct servtab *sep, int ctrl); 224 static int room_conn(struct servtab *sep, struct conninfo *conn); 225 static void addchild_conn(struct conninfo *conn, pid_t pid); 226 static void reapchild_conn(pid_t pid); 227 static void free_conn(struct conninfo *conn); 228 static void resize_conn(struct servtab *sep, int maxperip); 229 static void free_connlist(struct servtab *sep); 230 static void free_proc(struct procinfo *); 231 static struct procinfo *search_proc(pid_t pid, int add); 232 static int hashval(char *p, int len); 233 static char *skip(char **); 234 static char *sskip(char **); 235 static char *newstr(const char *); 236 static void print_service(const char *, const struct servtab *); 237 238 #ifdef LIBWRAP 239 /* tcpd.h */ 240 int allow_severity; 241 int deny_severity; 242 #endif 243 244 static int wrap_ex = 0; 245 static int wrap_bi = 0; 246 int debug = 0; 247 static int dolog = 0; 248 static int maxsock; /* highest-numbered descriptor */ 249 static fd_set allsock; 250 static int options; 251 static int timingout; 252 static int toomany = TOOMANY; 253 static int maxchild = MAXCHILD; 254 static int maxcpm = MAXCPM; 255 static int maxperip = MAXPERIP; 256 static struct servent *sp; 257 static struct rpcent *rpc; 258 static char *hostname = NULL; 259 static struct sockaddr_in *bind_sa4; 260 static int v4bind_ok = 0; 261 #ifdef INET6 262 static struct sockaddr_in6 *bind_sa6; 263 static int v6bind_ok = 0; 264 #endif 265 static int signalpipe[2]; 266 #ifdef SANITY_CHECK 267 static int nsock; 268 #endif 269 static uid_t euid; 270 static gid_t egid; 271 static mode_t mask; 272 273 struct servtab *servtab; 274 275 static const char *CONFIG = _PATH_INETDCONF; 276 static const char *pid_file = _PATH_INETDPID; 277 static struct pidfh *pfh = NULL; 278 279 static struct netconfig *udpconf, *tcpconf, *udp6conf, *tcp6conf; 280 281 static LIST_HEAD(, procinfo) proctable[PERIPSIZE]; 282 283 static int 284 getvalue(const char *arg, int *value, const char *whine) 285 { 286 int tmp; 287 char *p; 288 289 tmp = strtol(arg, &p, 0); 290 if (tmp < 0 || *p) { 291 syslog(LOG_ERR, whine, arg); 292 return 1; /* failure */ 293 } 294 *value = tmp; 295 return 0; /* success */ 296 } 297 298 #ifdef LIBWRAP 299 static sa_family_t 300 whichaf(struct request_info *req) 301 { 302 struct sockaddr *sa; 303 304 sa = (struct sockaddr *)req->client->sin; 305 if (sa == NULL) 306 return AF_UNSPEC; 307 #ifdef INET6 308 if (sa->sa_family == AF_INET6 && 309 IN6_IS_ADDR_V4MAPPED(&satosin6(sa)->sin6_addr)) 310 return AF_INET; 311 #endif 312 return sa->sa_family; 313 } 314 #endif 315 316 int 317 main(int argc, char **argv) 318 { 319 struct servtab *sep; 320 struct passwd *pwd; 321 struct group *grp; 322 struct sigaction sa, saalrm, sachld, sahup, sapipe; 323 int ch, dofork; 324 pid_t pid; 325 char buf[50]; 326 #ifdef LOGIN_CAP 327 login_cap_t *lc = NULL; 328 #endif 329 #ifdef LIBWRAP 330 struct request_info req; 331 int denied; 332 char *service = NULL; 333 #endif 334 struct sockaddr_storage peer; 335 int i; 336 struct addrinfo hints, *res; 337 const char *servname; 338 int error; 339 struct conninfo *conn; 340 341 openlog("inetd", LOG_PID | LOG_NOWAIT | LOG_PERROR, LOG_DAEMON); 342 343 while ((ch = getopt(argc, argv, "dlwWR:a:c:C:p:s:")) != -1) 344 switch(ch) { 345 case 'd': 346 debug = 1; 347 options |= SO_DEBUG; 348 break; 349 case 'l': 350 dolog = 1; 351 break; 352 case 'R': 353 getvalue(optarg, &toomany, 354 "-R %s: bad value for service invocation rate"); 355 break; 356 case 'c': 357 getvalue(optarg, &maxchild, 358 "-c %s: bad value for maximum children"); 359 break; 360 case 'C': 361 getvalue(optarg, &maxcpm, 362 "-C %s: bad value for maximum children/minute"); 363 break; 364 case 'a': 365 hostname = optarg; 366 break; 367 case 'p': 368 pid_file = optarg; 369 break; 370 case 's': 371 getvalue(optarg, &maxperip, 372 "-s %s: bad value for maximum children per source address"); 373 break; 374 case 'w': 375 wrap_ex++; 376 break; 377 case 'W': 378 wrap_bi++; 379 break; 380 case '?': 381 default: 382 syslog(LOG_ERR, 383 "usage: inetd [-dlWw] [-a address] [-C rate]" 384 " [-c maximum] [-p pidfile] [-R rate]" 385 " [-s maximum] [configuration_file]"); 386 exit(EX_USAGE); 387 } 388 /* 389 * Initialize Bind Addrs. 390 * When hostname is NULL, wild card bind addrs are obtained from 391 * getaddrinfo(). But getaddrinfo() requires at least one of 392 * hostname or servname is non NULL. 393 * So when hostname is NULL, set dummy value to servname. 394 * Since getaddrinfo() doesn't accept numeric servname, and 395 * we doesn't use ai_socktype of struct addrinfo returned 396 * from getaddrinfo(), we set dummy value to ai_socktype. 397 */ 398 servname = (hostname == NULL) ? "0" /* dummy */ : NULL; 399 400 memset(&hints, 0, sizeof(struct addrinfo)); 401 hints.ai_flags = AI_PASSIVE; 402 hints.ai_family = AF_UNSPEC; 403 hints.ai_socktype = SOCK_STREAM; /* dummy */ 404 error = getaddrinfo(hostname, servname, &hints, &res); 405 if (error != 0) { 406 syslog(LOG_ERR, "-a %s: %s", hostname, gai_strerror(error)); 407 if (error == EAI_SYSTEM) 408 syslog(LOG_ERR, "%s", strerror(errno)); 409 exit(EX_USAGE); 410 } 411 do { 412 if (res->ai_addr == NULL) { 413 syslog(LOG_ERR, "-a %s: getaddrinfo failed", hostname); 414 exit(EX_USAGE); 415 } 416 switch (res->ai_addr->sa_family) { 417 case AF_INET: 418 if (v4bind_ok) 419 continue; 420 bind_sa4 = satosin(res->ai_addr); 421 /* init port num in case servname is dummy */ 422 bind_sa4->sin_port = 0; 423 v4bind_ok = 1; 424 continue; 425 #ifdef INET6 426 case AF_INET6: 427 if (v6bind_ok) 428 continue; 429 bind_sa6 = satosin6(res->ai_addr); 430 /* init port num in case servname is dummy */ 431 bind_sa6->sin6_port = 0; 432 v6bind_ok = 1; 433 continue; 434 #endif 435 } 436 if (v4bind_ok 437 #ifdef INET6 438 && v6bind_ok 439 #endif 440 ) 441 break; 442 } while ((res = res->ai_next) != NULL); 443 if (!v4bind_ok 444 #ifdef INET6 445 && !v6bind_ok 446 #endif 447 ) { 448 syslog(LOG_ERR, "-a %s: unknown address family", hostname); 449 exit(EX_USAGE); 450 } 451 452 euid = geteuid(); 453 egid = getegid(); 454 umask(mask = umask(0777)); 455 456 argc -= optind; 457 argv += optind; 458 459 if (argc > 0) 460 CONFIG = argv[0]; 461 if (access(CONFIG, R_OK) < 0) 462 syslog(LOG_ERR, "Accessing %s: %m, continuing anyway.", CONFIG); 463 if (debug == 0) { 464 pid_t otherpid; 465 466 pfh = pidfile_open(pid_file, 0600, &otherpid); 467 if (pfh == NULL) { 468 if (errno == EEXIST) { 469 syslog(LOG_ERR, "%s already running, pid: %d", 470 getprogname(), otherpid); 471 exit(EX_OSERR); 472 } 473 syslog(LOG_WARNING, "pidfile_open() failed: %m"); 474 } 475 476 if (daemon(0, 0) < 0) { 477 syslog(LOG_WARNING, "daemon(0,0) failed: %m"); 478 } 479 /* From now on we don't want syslog messages going to stderr. */ 480 closelog(); 481 openlog("inetd", LOG_PID | LOG_NOWAIT, LOG_DAEMON); 482 /* 483 * In case somebody has started inetd manually, we need to 484 * clear the logname, so that old servers run as root do not 485 * get the user's logname.. 486 */ 487 if (setlogin("") < 0) { 488 syslog(LOG_WARNING, "cannot clear logname: %m"); 489 /* no big deal if it fails.. */ 490 } 491 if (pfh != NULL && pidfile_write(pfh) == -1) { 492 syslog(LOG_WARNING, "pidfile_write(): %m"); 493 } 494 } 495 496 if (madvise(NULL, 0, MADV_PROTECT) != 0) 497 syslog(LOG_WARNING, "madvise() failed: %s", strerror(errno)); 498 499 for (i = 0; i < PERIPSIZE; ++i) 500 LIST_INIT(&proctable[i]); 501 502 if (v4bind_ok) { 503 udpconf = getnetconfigent("udp"); 504 tcpconf = getnetconfigent("tcp"); 505 if (udpconf == NULL || tcpconf == NULL) { 506 syslog(LOG_ERR, "unknown rpc/udp or rpc/tcp"); 507 exit(EX_USAGE); 508 } 509 } 510 #ifdef INET6 511 if (v6bind_ok) { 512 udp6conf = getnetconfigent("udp6"); 513 tcp6conf = getnetconfigent("tcp6"); 514 if (udp6conf == NULL || tcp6conf == NULL) { 515 syslog(LOG_ERR, "unknown rpc/udp6 or rpc/tcp6"); 516 exit(EX_USAGE); 517 } 518 } 519 #endif 520 521 sa = (struct sigaction){ 522 .sa_flags = 0, 523 .sa_handler = flag_signal, 524 }; 525 sigemptyset(&sa.sa_mask); 526 sigaddset(&sa.sa_mask, SIGALRM); 527 sigaddset(&sa.sa_mask, SIGCHLD); 528 sigaddset(&sa.sa_mask, SIGHUP); 529 sigaction(SIGALRM, &sa, &saalrm); 530 config(); 531 sigaction(SIGHUP, &sa, &sahup); 532 sigaction(SIGCHLD, &sa, &sachld); 533 sa.sa_handler = SIG_IGN; 534 sigaction(SIGPIPE, &sa, &sapipe); 535 536 { 537 /* space for daemons to overwrite environment for ps */ 538 #define DUMMYSIZE 100 539 char dummy[DUMMYSIZE]; 540 541 (void)memset(dummy, 'x', DUMMYSIZE - 1); 542 dummy[DUMMYSIZE - 1] = '\0'; 543 (void)setenv("inetd_dummy", dummy, 1); 544 } 545 546 if (pipe2(signalpipe, O_CLOEXEC) != 0) { 547 syslog(LOG_ERR, "pipe: %m"); 548 exit(EX_OSERR); 549 } 550 FD_SET(signalpipe[0], &allsock); 551 #ifdef SANITY_CHECK 552 nsock++; 553 #endif 554 maxsock = MAX(MAX(maxsock, signalpipe[0]), signalpipe[1]); 555 556 for (;;) { 557 int n, ctrl; 558 fd_set readable; 559 560 #ifdef SANITY_CHECK 561 if (nsock == 0) { 562 syslog(LOG_ERR, "%s: nsock=0", __func__); 563 exit(EX_SOFTWARE); 564 } 565 #endif 566 readable = allsock; 567 if ((n = select(maxsock + 1, &readable, (fd_set *)0, 568 (fd_set *)0, (struct timeval *)0)) <= 0) { 569 if (n < 0 && errno != EINTR) { 570 syslog(LOG_WARNING, "select: %m"); 571 sleep(1); 572 } 573 continue; 574 } 575 /* handle any queued signal flags */ 576 if (FD_ISSET(signalpipe[0], &readable)) { 577 int nsig, signo; 578 579 if (ioctl(signalpipe[0], FIONREAD, &nsig) != 0) { 580 syslog(LOG_ERR, "ioctl: %m"); 581 exit(EX_OSERR); 582 } 583 nsig /= sizeof(signo); 584 while (--nsig >= 0) { 585 size_t len; 586 587 len = read(signalpipe[0], &signo, sizeof(signo)); 588 if (len != sizeof(signo)) { 589 syslog(LOG_ERR, "read: %m"); 590 exit(EX_OSERR); 591 } 592 if (debug) 593 warnx("handling signal flag %d", signo); 594 switch (signo) { 595 case SIGALRM: 596 retry(); 597 break; 598 case SIGCHLD: 599 reapchild(); 600 break; 601 case SIGHUP: 602 config(); 603 break; 604 } 605 } 606 } 607 for (sep = servtab; n && sep; sep = sep->se_next) 608 if (sep->se_fd != -1 && FD_ISSET(sep->se_fd, &readable)) { 609 n--; 610 if (debug) 611 warnx("someone wants %s", sep->se_service); 612 dofork = !sep->se_bi || sep->se_bi->bi_fork || ISWRAP(sep); 613 conn = NULL; 614 if (sep->se_accept && sep->se_socktype == SOCK_STREAM) { 615 i = 1; 616 if (ioctl(sep->se_fd, FIONBIO, &i) < 0) 617 syslog(LOG_ERR, "ioctl (FIONBIO, 1): %m"); 618 ctrl = accept(sep->se_fd, (struct sockaddr *)0, 619 (socklen_t *)0); 620 if (debug) 621 warnx("accept, ctrl %d", ctrl); 622 if (ctrl < 0) { 623 if (errno != EINTR) 624 syslog(LOG_WARNING, 625 "accept (for %s): %m", 626 sep->se_service); 627 if (sep->se_accept && 628 sep->se_socktype == SOCK_STREAM) 629 close(ctrl); 630 continue; 631 } 632 i = 0; 633 if (ioctl(sep->se_fd, FIONBIO, &i) < 0) 634 syslog(LOG_ERR, "ioctl1(FIONBIO, 0): %m"); 635 if (ioctl(ctrl, FIONBIO, &i) < 0) 636 syslog(LOG_ERR, "ioctl2(FIONBIO, 0): %m"); 637 if (cpmip(sep, ctrl) < 0) { 638 close(ctrl); 639 continue; 640 } 641 if (dofork && 642 (conn = search_conn(sep, ctrl)) != NULL && 643 !room_conn(sep, conn)) { 644 close(ctrl); 645 continue; 646 } 647 } else 648 ctrl = sep->se_fd; 649 if (dolog && !ISWRAP(sep)) { 650 char pname[NI_MAXHOST] = "unknown"; 651 socklen_t sl; 652 sl = sizeof(peer); 653 if (getpeername(ctrl, (struct sockaddr *) 654 &peer, &sl)) { 655 sl = sizeof(peer); 656 if (recvfrom(ctrl, buf, sizeof(buf), 657 MSG_PEEK, 658 (struct sockaddr *)&peer, 659 &sl) >= 0) { 660 getnameinfo((struct sockaddr *)&peer, 661 peer.ss_len, 662 pname, sizeof(pname), 663 NULL, 0, NI_NUMERICHOST); 664 } 665 } else { 666 getnameinfo((struct sockaddr *)&peer, 667 peer.ss_len, 668 pname, sizeof(pname), 669 NULL, 0, NI_NUMERICHOST); 670 } 671 syslog(LOG_INFO,"%s from %s", sep->se_service, pname); 672 } 673 (void) sigblock(SIGBLOCK); 674 pid = 0; 675 /* 676 * Fork for all external services, builtins which need to 677 * fork and anything we're wrapping (as wrapping might 678 * block or use hosts_options(5) twist). 679 */ 680 if (dofork) { 681 if (sep->se_count++ == 0) 682 (void)clock_gettime(CLOCK_MONOTONIC_FAST, &sep->se_time); 683 else if (toomany > 0 && sep->se_count >= toomany) { 684 struct timespec now; 685 686 (void)clock_gettime(CLOCK_MONOTONIC_FAST, &now); 687 if (now.tv_sec - sep->se_time.tv_sec > 688 CNT_INTVL) { 689 sep->se_time = now; 690 sep->se_count = 1; 691 } else { 692 syslog(LOG_ERR, 693 "%s/%s server failing (looping), service terminated", 694 sep->se_service, sep->se_proto); 695 if (sep->se_accept && 696 sep->se_socktype == SOCK_STREAM) 697 close(ctrl); 698 close_sep(sep); 699 free_conn(conn); 700 sigsetmask(0L); 701 if (!timingout) { 702 timingout = 1; 703 alarm(RETRYTIME); 704 } 705 continue; 706 } 707 } 708 pid = fork(); 709 } 710 if (pid < 0) { 711 syslog(LOG_ERR, "fork: %m"); 712 if (sep->se_accept && 713 sep->se_socktype == SOCK_STREAM) 714 close(ctrl); 715 free_conn(conn); 716 sigsetmask(0L); 717 sleep(1); 718 continue; 719 } 720 if (pid) { 721 addchild_conn(conn, pid); 722 addchild(sep, pid); 723 } 724 sigsetmask(0L); 725 if (pid == 0) { 726 pidfile_close(pfh); 727 if (dofork) { 728 sigaction(SIGALRM, &saalrm, (struct sigaction *)0); 729 sigaction(SIGCHLD, &sachld, (struct sigaction *)0); 730 sigaction(SIGHUP, &sahup, (struct sigaction *)0); 731 /* SIGPIPE reset before exec */ 732 } 733 /* 734 * Call tcpmux to find the real service to exec. 735 */ 736 if (sep->se_bi && 737 sep->se_bi->bi_fn == (bi_fn_t *) tcpmux) { 738 sep = tcpmux(ctrl); 739 if (sep == NULL) { 740 close(ctrl); 741 _exit(0); 742 } 743 } 744 #ifdef LIBWRAP 745 if (ISWRAP(sep)) { 746 inetd_setproctitle("wrapping", ctrl); 747 service = sep->se_server_name ? 748 sep->se_server_name : sep->se_service; 749 request_init(&req, RQ_DAEMON, service, RQ_FILE, ctrl, 0); 750 fromhost(&req); 751 deny_severity = LIBWRAP_DENY_FACILITY|LIBWRAP_DENY_SEVERITY; 752 allow_severity = LIBWRAP_ALLOW_FACILITY|LIBWRAP_ALLOW_SEVERITY; 753 denied = !hosts_access(&req); 754 if (denied) { 755 syslog(deny_severity, 756 "refused connection from %.500s, service %s (%s%s)", 757 eval_client(&req), service, sep->se_proto, 758 (whichaf(&req) == AF_INET6) ? "6" : ""); 759 if (sep->se_socktype != SOCK_STREAM) 760 recv(ctrl, buf, sizeof (buf), 0); 761 if (dofork) { 762 sleep(1); 763 _exit(0); 764 } 765 } 766 if (dolog) { 767 syslog(allow_severity, 768 "connection from %.500s, service %s (%s%s)", 769 eval_client(&req), service, sep->se_proto, 770 (whichaf(&req) == AF_INET6) ? "6" : ""); 771 } 772 } 773 #endif 774 if (sep->se_bi) { 775 (*sep->se_bi->bi_fn)(ctrl, sep); 776 } else { 777 if (debug) 778 warnx("%d execl %s", 779 getpid(), sep->se_server); 780 /* Clear close-on-exec. */ 781 if (fcntl(ctrl, F_SETFD, 0) < 0) { 782 syslog(LOG_ERR, 783 "%s/%s: fcntl (F_SETFD, 0): %m", 784 sep->se_service, sep->se_proto); 785 _exit(EX_OSERR); 786 } 787 if (ctrl != 0) { 788 dup2(ctrl, 0); 789 close(ctrl); 790 } 791 dup2(0, 1); 792 dup2(0, 2); 793 if ((pwd = getpwnam(sep->se_user)) == NULL) { 794 syslog(LOG_ERR, 795 "%s/%s: %s: no such user", 796 sep->se_service, sep->se_proto, 797 sep->se_user); 798 if (sep->se_socktype != SOCK_STREAM) 799 recv(0, buf, sizeof (buf), 0); 800 _exit(EX_NOUSER); 801 } 802 grp = NULL; 803 if ( sep->se_group != NULL 804 && (grp = getgrnam(sep->se_group)) == NULL 805 ) { 806 syslog(LOG_ERR, 807 "%s/%s: %s: no such group", 808 sep->se_service, sep->se_proto, 809 sep->se_group); 810 if (sep->se_socktype != SOCK_STREAM) 811 recv(0, buf, sizeof (buf), 0); 812 _exit(EX_NOUSER); 813 } 814 if (grp != NULL) 815 pwd->pw_gid = grp->gr_gid; 816 #ifdef LOGIN_CAP 817 if ((lc = login_getclass(sep->se_class)) == NULL) { 818 /* error syslogged by getclass */ 819 syslog(LOG_ERR, 820 "%s/%s: %s: login class error", 821 sep->se_service, sep->se_proto, 822 sep->se_class); 823 if (sep->se_socktype != SOCK_STREAM) 824 recv(0, buf, sizeof (buf), 0); 825 _exit(EX_NOUSER); 826 } 827 #endif 828 if (setsid() < 0) { 829 syslog(LOG_ERR, 830 "%s: can't setsid(): %m", 831 sep->se_service); 832 /* _exit(EX_OSERR); not fatal yet */ 833 } 834 #ifdef LOGIN_CAP 835 if (setusercontext(lc, pwd, pwd->pw_uid, 836 LOGIN_SETALL & ~LOGIN_SETMAC) 837 != 0) { 838 syslog(LOG_ERR, 839 "%s: can't setusercontext(..%s..): %m", 840 sep->se_service, sep->se_user); 841 _exit(EX_OSERR); 842 } 843 login_close(lc); 844 #else 845 if (pwd->pw_uid) { 846 if (setlogin(sep->se_user) < 0) { 847 syslog(LOG_ERR, 848 "%s: can't setlogin(%s): %m", 849 sep->se_service, sep->se_user); 850 /* _exit(EX_OSERR); not yet */ 851 } 852 if (setgid(pwd->pw_gid) < 0) { 853 syslog(LOG_ERR, 854 "%s: can't set gid %d: %m", 855 sep->se_service, pwd->pw_gid); 856 _exit(EX_OSERR); 857 } 858 (void) initgroups(pwd->pw_name, 859 pwd->pw_gid); 860 if (setuid(pwd->pw_uid) < 0) { 861 syslog(LOG_ERR, 862 "%s: can't set uid %d: %m", 863 sep->se_service, pwd->pw_uid); 864 _exit(EX_OSERR); 865 } 866 } 867 #endif 868 sigaction(SIGPIPE, &sapipe, 869 (struct sigaction *)0); 870 execv(sep->se_server, sep->se_argv); 871 syslog(LOG_ERR, 872 "cannot execute %s: %m", sep->se_server); 873 if (sep->se_socktype != SOCK_STREAM) 874 recv(0, buf, sizeof (buf), 0); 875 } 876 if (dofork) 877 _exit(0); 878 } 879 if (sep->se_accept && sep->se_socktype == SOCK_STREAM) 880 close(ctrl); 881 } 882 } 883 } 884 885 /* 886 * Add a signal flag to the signal flag queue for later handling 887 */ 888 889 static void 890 flag_signal(int signo) 891 { 892 size_t len; 893 894 len = write(signalpipe[1], &signo, sizeof(signo)); 895 if (len != sizeof(signo)) { 896 syslog(LOG_ERR, "write: %m"); 897 _exit(EX_OSERR); 898 } 899 } 900 901 /* 902 * Record a new child pid for this service. If we've reached the 903 * limit on children, then stop accepting incoming requests. 904 */ 905 906 static void 907 addchild(struct servtab *sep, pid_t pid) 908 { 909 struct stabchild *sc; 910 911 #ifdef SANITY_CHECK 912 if (SERVTAB_EXCEEDS_LIMIT(sep)) { 913 syslog(LOG_ERR, "%s: %d >= %d", 914 __func__, sep->se_numchild, sep->se_maxchild); 915 exit(EX_SOFTWARE); 916 } 917 #endif 918 sc = calloc(1, sizeof(*sc)); 919 if (sc == NULL) { 920 syslog(LOG_ERR, "calloc: %m"); 921 exit(EX_OSERR); 922 } 923 sc->sc_pid = pid; 924 LIST_INSERT_HEAD(&sep->se_children, sc, sc_link); 925 ++sep->se_numchild; 926 if (SERVTAB_AT_LIMIT(sep)) 927 disable(sep); 928 } 929 930 static void 931 reapchild(void) 932 { 933 int status; 934 pid_t pid; 935 struct stabchild *sc; 936 struct servtab *sep; 937 938 for (;;) { 939 pid = wait3(&status, WNOHANG, (struct rusage *)0); 940 if (pid <= 0) 941 break; 942 if (debug) 943 warnx("%d reaped, %s %u", pid, 944 WIFEXITED(status) ? "status" : "signal", 945 WIFEXITED(status) ? WEXITSTATUS(status) 946 : WTERMSIG(status)); 947 for (sep = servtab; sep; sep = sep->se_next) { 948 LIST_FOREACH(sc, &sep->se_children, sc_link) { 949 if (sc->sc_pid == pid) 950 break; 951 } 952 if (sc == NULL) 953 continue; 954 if (SERVTAB_AT_LIMIT(sep)) 955 enable(sep); 956 LIST_REMOVE(sc, sc_link); 957 free(sc); 958 --sep->se_numchild; 959 if (WIFSIGNALED(status) || WEXITSTATUS(status)) 960 syslog(LOG_WARNING, 961 "%s[%d]: exited, %s %u", 962 sep->se_server, pid, 963 WIFEXITED(status) ? "status" : "signal", 964 WIFEXITED(status) ? WEXITSTATUS(status) 965 : WTERMSIG(status)); 966 break; 967 } 968 reapchild_conn(pid); 969 } 970 } 971 972 static void 973 config(void) 974 { 975 struct servtab *sep, *new, **sepp; 976 long omask; 977 int new_nomapped; 978 #ifdef LOGIN_CAP 979 login_cap_t *lc = NULL; 980 #endif 981 982 if (!setconfig()) { 983 syslog(LOG_ERR, "%s: %m", CONFIG); 984 return; 985 } 986 for (sep = servtab; sep; sep = sep->se_next) 987 sep->se_checked = 0; 988 while ((new = getconfigent())) { 989 if (getpwnam(new->se_user) == NULL) { 990 syslog(LOG_ERR, 991 "%s/%s: no such user '%s', service ignored", 992 new->se_service, new->se_proto, new->se_user); 993 continue; 994 } 995 if (new->se_group && getgrnam(new->se_group) == NULL) { 996 syslog(LOG_ERR, 997 "%s/%s: no such group '%s', service ignored", 998 new->se_service, new->se_proto, new->se_group); 999 continue; 1000 } 1001 #ifdef LOGIN_CAP 1002 if ((lc = login_getclass(new->se_class)) == NULL) { 1003 /* error syslogged by getclass */ 1004 syslog(LOG_ERR, 1005 "%s/%s: %s: login class error, service ignored", 1006 new->se_service, new->se_proto, new->se_class); 1007 continue; 1008 } 1009 login_close(lc); 1010 #endif 1011 new_nomapped = new->se_nomapped; 1012 for (sep = servtab; sep; sep = sep->se_next) 1013 if (strcmp(sep->se_service, new->se_service) == 0 && 1014 strcmp(sep->se_proto, new->se_proto) == 0 && 1015 sep->se_rpc == new->se_rpc && 1016 sep->se_socktype == new->se_socktype && 1017 sep->se_family == new->se_family) 1018 break; 1019 if (sep != 0) { 1020 int i; 1021 1022 #define SWAP(t,a, b) { t c = a; a = b; b = c; } 1023 omask = sigblock(SIGBLOCK); 1024 if (sep->se_nomapped != new->se_nomapped) { 1025 /* for rpc keep old nommaped till unregister */ 1026 if (!sep->se_rpc) 1027 sep->se_nomapped = new->se_nomapped; 1028 sep->se_reset = 1; 1029 } 1030 1031 /* 1032 * The children tracked remain; we want numchild to 1033 * still reflect how many jobs are running so we don't 1034 * throw off our accounting. 1035 */ 1036 sep->se_maxcpm = new->se_maxcpm; 1037 sep->se_maxchild = new->se_maxchild; 1038 resize_conn(sep, new->se_maxperip); 1039 sep->se_maxperip = new->se_maxperip; 1040 sep->se_bi = new->se_bi; 1041 /* might need to turn on or off service now */ 1042 if (sep->se_fd >= 0) { 1043 if (SERVTAB_EXCEEDS_LIMIT(sep)) { 1044 if (FD_ISSET(sep->se_fd, &allsock)) 1045 disable(sep); 1046 } else { 1047 if (!FD_ISSET(sep->se_fd, &allsock)) 1048 enable(sep); 1049 } 1050 } 1051 sep->se_accept = new->se_accept; 1052 SWAP(char *, sep->se_user, new->se_user); 1053 SWAP(char *, sep->se_group, new->se_group); 1054 #ifdef LOGIN_CAP 1055 SWAP(char *, sep->se_class, new->se_class); 1056 #endif 1057 SWAP(char *, sep->se_server, new->se_server); 1058 SWAP(char *, sep->se_server_name, new->se_server_name); 1059 for (i = 0; i < MAXARGV; i++) 1060 SWAP(char *, sep->se_argv[i], new->se_argv[i]); 1061 #ifdef IPSEC 1062 SWAP(char *, sep->se_policy, new->se_policy); 1063 ipsecsetup(sep); 1064 #endif 1065 sigsetmask(omask); 1066 freeconfig(new); 1067 if (debug) 1068 print_service("REDO", sep); 1069 } else { 1070 sep = enter(new); 1071 if (debug) 1072 print_service("ADD ", sep); 1073 } 1074 sep->se_checked = 1; 1075 if (ISMUX(sep)) { 1076 sep->se_fd = -1; 1077 continue; 1078 } 1079 switch (sep->se_family) { 1080 case AF_INET: 1081 if (!v4bind_ok) { 1082 sep->se_fd = -1; 1083 continue; 1084 } 1085 break; 1086 #ifdef INET6 1087 case AF_INET6: 1088 if (!v6bind_ok) { 1089 sep->se_fd = -1; 1090 continue; 1091 } 1092 break; 1093 #endif 1094 } 1095 if (!sep->se_rpc) { 1096 if (sep->se_family != AF_UNIX) { 1097 sp = getservbyname(sep->se_service, sep->se_proto); 1098 if (sp == 0) { 1099 syslog(LOG_ERR, "%s/%s: unknown service", 1100 sep->se_service, sep->se_proto); 1101 sep->se_checked = 0; 1102 continue; 1103 } 1104 } 1105 switch (sep->se_family) { 1106 case AF_INET: 1107 if (sp->s_port != sep->se_ctrladdr4.sin_port) { 1108 sep->se_ctrladdr4.sin_port = 1109 sp->s_port; 1110 sep->se_reset = 1; 1111 } 1112 break; 1113 #ifdef INET6 1114 case AF_INET6: 1115 if (sp->s_port != 1116 sep->se_ctrladdr6.sin6_port) { 1117 sep->se_ctrladdr6.sin6_port = 1118 sp->s_port; 1119 sep->se_reset = 1; 1120 } 1121 break; 1122 #endif 1123 } 1124 if (sep->se_reset != 0 && sep->se_fd >= 0) 1125 close_sep(sep); 1126 } else { 1127 rpc = getrpcbyname(sep->se_service); 1128 if (rpc == 0) { 1129 syslog(LOG_ERR, "%s/%s unknown RPC service", 1130 sep->se_service, sep->se_proto); 1131 if (sep->se_fd != -1) 1132 (void) close(sep->se_fd); 1133 sep->se_fd = -1; 1134 continue; 1135 } 1136 if (sep->se_reset != 0 || 1137 rpc->r_number != sep->se_rpc_prog) { 1138 if (sep->se_rpc_prog) 1139 unregisterrpc(sep); 1140 sep->se_rpc_prog = rpc->r_number; 1141 if (sep->se_fd != -1) 1142 (void) close(sep->se_fd); 1143 sep->se_fd = -1; 1144 } 1145 sep->se_nomapped = new_nomapped; 1146 } 1147 sep->se_reset = 0; 1148 if (sep->se_fd == -1) 1149 setup(sep); 1150 } 1151 endconfig(); 1152 /* 1153 * Purge anything not looked at above. 1154 */ 1155 omask = sigblock(SIGBLOCK); 1156 sepp = &servtab; 1157 while ((sep = *sepp)) { 1158 if (sep->se_checked) { 1159 sepp = &sep->se_next; 1160 continue; 1161 } 1162 *sepp = sep->se_next; 1163 if (sep->se_fd >= 0) 1164 close_sep(sep); 1165 if (debug) 1166 print_service("FREE", sep); 1167 if (sep->se_rpc && sep->se_rpc_prog > 0) 1168 unregisterrpc(sep); 1169 freeconfig(sep); 1170 free(sep); 1171 } 1172 (void) sigsetmask(omask); 1173 } 1174 1175 static void 1176 unregisterrpc(struct servtab *sep) 1177 { 1178 u_int i; 1179 struct servtab *sepp; 1180 long omask; 1181 struct netconfig *netid4, *netid6; 1182 1183 omask = sigblock(SIGBLOCK); 1184 netid4 = sep->se_socktype == SOCK_DGRAM ? udpconf : tcpconf; 1185 netid6 = sep->se_socktype == SOCK_DGRAM ? udp6conf : tcp6conf; 1186 if (sep->se_family == AF_INET) 1187 netid6 = NULL; 1188 else if (sep->se_nomapped) 1189 netid4 = NULL; 1190 /* 1191 * Conflict if same prog and protocol - In that case one should look 1192 * to versions, but it is not interesting: having separate servers for 1193 * different versions does not work well. 1194 * Therefore one do not unregister if there is a conflict. 1195 * There is also transport conflict if destroying INET when INET46 1196 * exists, or destroying INET46 when INET exists 1197 */ 1198 for (sepp = servtab; sepp; sepp = sepp->se_next) { 1199 if (sepp == sep) 1200 continue; 1201 if (sepp->se_checked == 0 || 1202 !sepp->se_rpc || 1203 strcmp(sep->se_proto, sepp->se_proto) != 0 || 1204 sep->se_rpc_prog != sepp->se_rpc_prog) 1205 continue; 1206 if (sepp->se_family == AF_INET) 1207 netid4 = NULL; 1208 if (sepp->se_family == AF_INET6) { 1209 netid6 = NULL; 1210 if (!sep->se_nomapped) 1211 netid4 = NULL; 1212 } 1213 if (netid4 == NULL && netid6 == NULL) 1214 return; 1215 } 1216 if (debug) 1217 print_service("UNREG", sep); 1218 for (i = sep->se_rpc_lowvers; i <= sep->se_rpc_highvers; i++) { 1219 if (netid4) 1220 rpcb_unset(sep->se_rpc_prog, i, netid4); 1221 if (netid6) 1222 rpcb_unset(sep->se_rpc_prog, i, netid6); 1223 } 1224 if (sep->se_fd != -1) 1225 (void) close(sep->se_fd); 1226 sep->se_fd = -1; 1227 (void) sigsetmask(omask); 1228 } 1229 1230 static void 1231 retry(void) 1232 { 1233 struct servtab *sep; 1234 1235 timingout = 0; 1236 for (sep = servtab; sep; sep = sep->se_next) 1237 if (sep->se_fd == -1 && !ISMUX(sep)) 1238 setup(sep); 1239 } 1240 1241 static void 1242 setup(struct servtab *sep) 1243 { 1244 int on = 1; 1245 1246 /* Set all listening sockets to close-on-exec. */ 1247 if ((sep->se_fd = socket(sep->se_family, 1248 sep->se_socktype | SOCK_CLOEXEC, 0)) < 0) { 1249 if (debug) 1250 warn("socket failed on %s/%s", 1251 sep->se_service, sep->se_proto); 1252 syslog(LOG_ERR, "%s/%s: socket: %m", 1253 sep->se_service, sep->se_proto); 1254 return; 1255 } 1256 #define turnon(fd, opt) \ 1257 setsockopt(fd, SOL_SOCKET, opt, (char *)&on, sizeof (on)) 1258 if (strcmp(sep->se_proto, "tcp") == 0 && (options & SO_DEBUG) && 1259 turnon(sep->se_fd, SO_DEBUG) < 0) 1260 syslog(LOG_ERR, "setsockopt (SO_DEBUG): %m"); 1261 if (turnon(sep->se_fd, SO_REUSEADDR) < 0) 1262 syslog(LOG_ERR, "setsockopt (SO_REUSEADDR): %m"); 1263 #ifdef SO_PRIVSTATE 1264 if (turnon(sep->se_fd, SO_PRIVSTATE) < 0) 1265 syslog(LOG_ERR, "setsockopt (SO_PRIVSTATE): %m"); 1266 #endif 1267 /* tftpd opens a new connection then needs more infos */ 1268 #ifdef INET6 1269 if ((sep->se_family == AF_INET6) && 1270 (strcmp(sep->se_proto, "udp") == 0) && 1271 (sep->se_accept == 0) && 1272 (setsockopt(sep->se_fd, IPPROTO_IPV6, IPV6_RECVPKTINFO, 1273 (char *)&on, sizeof (on)) < 0)) 1274 syslog(LOG_ERR, "setsockopt (IPV6_RECVPKTINFO): %m"); 1275 if (sep->se_family == AF_INET6) { 1276 int flag = sep->se_nomapped ? 1 : 0; 1277 if (setsockopt(sep->se_fd, IPPROTO_IPV6, IPV6_V6ONLY, 1278 (char *)&flag, sizeof (flag)) < 0) 1279 syslog(LOG_ERR, "setsockopt (IPV6_V6ONLY): %m"); 1280 } 1281 #endif 1282 #undef turnon 1283 #ifdef IPSEC 1284 ipsecsetup(sep); 1285 #endif 1286 if (sep->se_family == AF_UNIX) { 1287 (void) unlink(sep->se_ctrladdr_un.sun_path); 1288 umask(0777); /* Make socket with conservative permissions */ 1289 } 1290 if (bind(sep->se_fd, (struct sockaddr *)&sep->se_ctrladdr, 1291 sep->se_ctrladdr_size) < 0) { 1292 if (debug) 1293 warn("bind failed on %s/%s", 1294 sep->se_service, sep->se_proto); 1295 syslog(LOG_ERR, "%s/%s: bind: %m", 1296 sep->se_service, sep->se_proto); 1297 (void) close(sep->se_fd); 1298 sep->se_fd = -1; 1299 if (!timingout) { 1300 timingout = 1; 1301 alarm(RETRYTIME); 1302 } 1303 if (sep->se_family == AF_UNIX) 1304 umask(mask); 1305 return; 1306 } 1307 if (sep->se_family == AF_UNIX) { 1308 /* Ick - fch{own,mod} don't work on Unix domain sockets */ 1309 if (chown(sep->se_service, sep->se_sockuid, sep->se_sockgid) < 0) 1310 syslog(LOG_ERR, "chown socket: %m"); 1311 if (chmod(sep->se_service, sep->se_sockmode) < 0) 1312 syslog(LOG_ERR, "chmod socket: %m"); 1313 umask(mask); 1314 } 1315 if (sep->se_rpc) { 1316 u_int i; 1317 socklen_t len = sep->se_ctrladdr_size; 1318 struct netconfig *netid; 1319 struct netbuf nbuf; 1320 #ifdef INET6 1321 struct netconfig *netid2 = NULL; 1322 struct sockaddr_in sock; 1323 struct netbuf nbuf2; 1324 #endif 1325 1326 if (getsockname(sep->se_fd, 1327 (struct sockaddr*)&sep->se_ctrladdr, &len) < 0){ 1328 syslog(LOG_ERR, "%s/%s: getsockname: %m", 1329 sep->se_service, sep->se_proto); 1330 (void) close(sep->se_fd); 1331 sep->se_fd = -1; 1332 return; 1333 } 1334 nbuf.buf = &sep->se_ctrladdr; 1335 nbuf.len = sep->se_ctrladdr.sa_len; 1336 if (sep->se_family == AF_INET) 1337 netid = sep->se_socktype==SOCK_DGRAM? udpconf:tcpconf; 1338 #ifdef INET6 1339 else { 1340 netid = sep->se_socktype==SOCK_DGRAM? udp6conf:tcp6conf; 1341 if (!sep->se_nomapped) { /* INET and INET6 */ 1342 netid2 = netid==udp6conf? udpconf:tcpconf; 1343 memset(&sock, 0, sizeof sock); /* ADDR_ANY */ 1344 nbuf2.buf = &sock; 1345 nbuf2.len = sock.sin_len = sizeof sock; 1346 sock.sin_family = AF_INET; 1347 sock.sin_port = sep->se_ctrladdr6.sin6_port; 1348 } 1349 } 1350 #else 1351 else { 1352 syslog(LOG_ERR, 1353 "%s/%s: inetd compiled without inet6 support\n", 1354 sep->se_service, sep->se_proto); 1355 (void) close(sep->se_fd); 1356 sep->se_fd = -1; 1357 return; 1358 } 1359 #endif 1360 if (debug) 1361 print_service("REG ", sep); 1362 for (i = sep->se_rpc_lowvers; i <= sep->se_rpc_highvers; i++) { 1363 rpcb_unset(sep->se_rpc_prog, i, netid); 1364 rpcb_set(sep->se_rpc_prog, i, netid, &nbuf); 1365 #ifdef INET6 1366 if (netid2) { 1367 rpcb_unset(sep->se_rpc_prog, i, netid2); 1368 rpcb_set(sep->se_rpc_prog, i, netid2, &nbuf2); 1369 } 1370 #endif 1371 } 1372 } 1373 if (sep->se_socktype == SOCK_STREAM) 1374 listen(sep->se_fd, -1); 1375 enable(sep); 1376 if (debug) { 1377 warnx("registered %s on %d", 1378 sep->se_server, sep->se_fd); 1379 } 1380 } 1381 1382 #ifdef IPSEC 1383 static void 1384 ipsecsetup(struct servtab *sep) 1385 { 1386 char *buf; 1387 char *policy_in = NULL; 1388 char *policy_out = NULL; 1389 int level; 1390 int opt; 1391 1392 switch (sep->se_family) { 1393 case AF_INET: 1394 level = IPPROTO_IP; 1395 opt = IP_IPSEC_POLICY; 1396 break; 1397 #ifdef INET6 1398 case AF_INET6: 1399 level = IPPROTO_IPV6; 1400 opt = IPV6_IPSEC_POLICY; 1401 break; 1402 #endif 1403 default: 1404 return; 1405 } 1406 1407 if (!sep->se_policy || sep->se_policy[0] == '\0') { 1408 static char def_in[] = "in entrust", def_out[] = "out entrust"; 1409 policy_in = def_in; 1410 policy_out = def_out; 1411 } else { 1412 if (!strncmp("in", sep->se_policy, 2)) 1413 policy_in = sep->se_policy; 1414 else if (!strncmp("out", sep->se_policy, 3)) 1415 policy_out = sep->se_policy; 1416 else { 1417 syslog(LOG_ERR, "invalid security policy \"%s\"", 1418 sep->se_policy); 1419 return; 1420 } 1421 } 1422 1423 if (policy_in != NULL) { 1424 buf = ipsec_set_policy(policy_in, strlen(policy_in)); 1425 if (buf != NULL) { 1426 if (setsockopt(sep->se_fd, level, opt, 1427 buf, ipsec_get_policylen(buf)) < 0 && 1428 debug != 0) 1429 warnx("%s/%s: ipsec initialization failed; %s", 1430 sep->se_service, sep->se_proto, 1431 policy_in); 1432 free(buf); 1433 } else 1434 syslog(LOG_ERR, "invalid security policy \"%s\"", 1435 policy_in); 1436 } 1437 if (policy_out != NULL) { 1438 buf = ipsec_set_policy(policy_out, strlen(policy_out)); 1439 if (buf != NULL) { 1440 if (setsockopt(sep->se_fd, level, opt, 1441 buf, ipsec_get_policylen(buf)) < 0 && 1442 debug != 0) 1443 warnx("%s/%s: ipsec initialization failed; %s", 1444 sep->se_service, sep->se_proto, 1445 policy_out); 1446 free(buf); 1447 } else 1448 syslog(LOG_ERR, "invalid security policy \"%s\"", 1449 policy_out); 1450 } 1451 } 1452 #endif 1453 1454 /* 1455 * Finish with a service and its socket. 1456 */ 1457 static void 1458 close_sep(struct servtab *sep) 1459 { 1460 if (sep->se_fd >= 0) { 1461 if (FD_ISSET(sep->se_fd, &allsock)) 1462 disable(sep); 1463 (void) close(sep->se_fd); 1464 sep->se_fd = -1; 1465 } 1466 sep->se_count = 0; 1467 sep->se_numchild = 0; /* forget about any existing children */ 1468 } 1469 1470 static int 1471 matchservent(const char *name1, const char *name2, const char *proto) 1472 { 1473 char **alias, *p; 1474 struct servent *se; 1475 1476 if (strcmp(proto, "unix") == 0) { 1477 if ((p = strrchr(name1, '/')) != NULL) 1478 name1 = p + 1; 1479 if ((p = strrchr(name2, '/')) != NULL) 1480 name2 = p + 1; 1481 } 1482 if (strcmp(name1, name2) == 0) 1483 return(1); 1484 if ((se = getservbyname(name1, proto)) != NULL) { 1485 if (strcmp(name2, se->s_name) == 0) 1486 return(1); 1487 for (alias = se->s_aliases; *alias; alias++) 1488 if (strcmp(name2, *alias) == 0) 1489 return(1); 1490 } 1491 return(0); 1492 } 1493 1494 static struct servtab * 1495 enter(struct servtab *cp) 1496 { 1497 struct servtab *sep; 1498 long omask; 1499 1500 sep = malloc(sizeof(*sep)); 1501 if (sep == NULL) { 1502 syslog(LOG_ERR, "malloc: %m"); 1503 exit(EX_OSERR); 1504 } 1505 *sep = *cp; 1506 sep->se_fd = -1; 1507 omask = sigblock(SIGBLOCK); 1508 sep->se_next = servtab; 1509 servtab = sep; 1510 sigsetmask(omask); 1511 return (sep); 1512 } 1513 1514 static void 1515 enable(struct servtab *sep) 1516 { 1517 if (debug) 1518 warnx( 1519 "enabling %s, fd %d", sep->se_service, sep->se_fd); 1520 #ifdef SANITY_CHECK 1521 if (sep->se_fd < 0) { 1522 syslog(LOG_ERR, 1523 "%s: %s: bad fd", __func__, sep->se_service); 1524 exit(EX_SOFTWARE); 1525 } 1526 if (ISMUX(sep)) { 1527 syslog(LOG_ERR, 1528 "%s: %s: is mux", __func__, sep->se_service); 1529 exit(EX_SOFTWARE); 1530 } 1531 if (FD_ISSET(sep->se_fd, &allsock)) { 1532 syslog(LOG_ERR, 1533 "%s: %s: not off", __func__, sep->se_service); 1534 exit(EX_SOFTWARE); 1535 } 1536 nsock++; 1537 #endif 1538 FD_SET(sep->se_fd, &allsock); 1539 maxsock = MAX(maxsock, sep->se_fd); 1540 } 1541 1542 static void 1543 disable(struct servtab *sep) 1544 { 1545 if (debug) 1546 warnx( 1547 "disabling %s, fd %d", sep->se_service, sep->se_fd); 1548 #ifdef SANITY_CHECK 1549 if (sep->se_fd < 0) { 1550 syslog(LOG_ERR, 1551 "%s: %s: bad fd", __func__, sep->se_service); 1552 exit(EX_SOFTWARE); 1553 } 1554 if (ISMUX(sep)) { 1555 syslog(LOG_ERR, 1556 "%s: %s: is mux", __func__, sep->se_service); 1557 exit(EX_SOFTWARE); 1558 } 1559 if (!FD_ISSET(sep->se_fd, &allsock)) { 1560 syslog(LOG_ERR, 1561 "%s: %s: not on", __func__, sep->se_service); 1562 exit(EX_SOFTWARE); 1563 } 1564 if (nsock == 0) { 1565 syslog(LOG_ERR, "%s: nsock=0", __func__); 1566 exit(EX_SOFTWARE); 1567 } 1568 nsock--; 1569 #endif 1570 FD_CLR(sep->se_fd, &allsock); 1571 if (sep->se_fd == maxsock) 1572 maxsock--; 1573 } 1574 1575 static FILE *fconfig = NULL; 1576 static struct servtab serv; 1577 static char line[LINE_MAX]; 1578 1579 static int 1580 setconfig(void) 1581 { 1582 1583 if (fconfig != NULL) { 1584 fseek(fconfig, 0L, SEEK_SET); 1585 return (1); 1586 } 1587 fconfig = fopen(CONFIG, "r"); 1588 return (fconfig != NULL); 1589 } 1590 1591 static void 1592 endconfig(void) 1593 { 1594 if (fconfig) { 1595 (void) fclose(fconfig); 1596 fconfig = NULL; 1597 } 1598 } 1599 1600 static struct servtab * 1601 getconfigent(void) 1602 { 1603 struct servtab *sep = &serv; 1604 int argc; 1605 char *cp, *arg, *s; 1606 char *versp; 1607 static char TCPMUX_TOKEN[] = "tcpmux/"; 1608 #define MUX_LEN (sizeof(TCPMUX_TOKEN)-1) 1609 #ifdef IPSEC 1610 char *policy; 1611 #endif 1612 #ifdef INET6 1613 int v4bind; 1614 int v6bind; 1615 #endif 1616 int i; 1617 1618 #ifdef IPSEC 1619 policy = NULL; 1620 #endif 1621 more: 1622 #ifdef INET6 1623 v4bind = 0; 1624 v6bind = 0; 1625 #endif 1626 while ((cp = nextline(fconfig)) != NULL) { 1627 #ifdef IPSEC 1628 /* lines starting with #@ is not a comment, but the policy */ 1629 if (cp[0] == '#' && cp[1] == '@') { 1630 char *p; 1631 for (p = cp + 2; p && *p && isspace(*p); p++) 1632 ; 1633 if (*p == '\0') { 1634 free(policy); 1635 policy = NULL; 1636 } else if (ipsec_get_policylen(p) >= 0) { 1637 free(policy); 1638 policy = newstr(p); 1639 } else { 1640 syslog(LOG_ERR, 1641 "%s: invalid ipsec policy \"%s\"", 1642 CONFIG, p); 1643 exit(EX_CONFIG); 1644 } 1645 } 1646 #endif 1647 if (*cp == '#' || *cp == '\0') 1648 continue; 1649 break; 1650 } 1651 if (cp == NULL) { 1652 #ifdef IPSEC 1653 free(policy); 1654 #endif 1655 return (NULL); 1656 } 1657 1658 /* 1659 * clear the static buffer, since some fields (se_ctrladdr, 1660 * for example) don't get initialized here. 1661 */ 1662 memset(sep, 0, sizeof *sep); 1663 arg = skip(&cp); 1664 if (cp == NULL) { 1665 /* got an empty line containing just blanks/tabs. */ 1666 goto more; 1667 } 1668 if (arg[0] == ':') { /* :user:group:perm: */ 1669 char *user, *group, *perm; 1670 struct passwd *pw; 1671 struct group *gr; 1672 user = arg+1; 1673 if ((group = strchr(user, ':')) == NULL) { 1674 syslog(LOG_ERR, "no group after user '%s'", user); 1675 goto more; 1676 } 1677 *group++ = '\0'; 1678 if ((perm = strchr(group, ':')) == NULL) { 1679 syslog(LOG_ERR, "no mode after group '%s'", group); 1680 goto more; 1681 } 1682 *perm++ = '\0'; 1683 if ((pw = getpwnam(user)) == NULL) { 1684 syslog(LOG_ERR, "no such user '%s'", user); 1685 goto more; 1686 } 1687 sep->se_sockuid = pw->pw_uid; 1688 if ((gr = getgrnam(group)) == NULL) { 1689 syslog(LOG_ERR, "no such user '%s'", group); 1690 goto more; 1691 } 1692 sep->se_sockgid = gr->gr_gid; 1693 sep->se_sockmode = strtol(perm, &arg, 8); 1694 if (*arg != ':') { 1695 syslog(LOG_ERR, "bad mode '%s'", perm); 1696 goto more; 1697 } 1698 *arg++ = '\0'; 1699 } else { 1700 sep->se_sockuid = euid; 1701 sep->se_sockgid = egid; 1702 sep->se_sockmode = 0200; 1703 } 1704 if (strncmp(arg, TCPMUX_TOKEN, MUX_LEN) == 0) { 1705 char *c = arg + MUX_LEN; 1706 if (*c == '+') { 1707 sep->se_type = MUXPLUS_TYPE; 1708 c++; 1709 } else 1710 sep->se_type = MUX_TYPE; 1711 sep->se_service = newstr(c); 1712 } else { 1713 sep->se_service = newstr(arg); 1714 sep->se_type = NORM_TYPE; 1715 } 1716 arg = sskip(&cp); 1717 if (strcmp(arg, "stream") == 0) 1718 sep->se_socktype = SOCK_STREAM; 1719 else if (strcmp(arg, "dgram") == 0) 1720 sep->se_socktype = SOCK_DGRAM; 1721 else if (strcmp(arg, "rdm") == 0) 1722 sep->se_socktype = SOCK_RDM; 1723 else if (strcmp(arg, "seqpacket") == 0) 1724 sep->se_socktype = SOCK_SEQPACKET; 1725 else if (strcmp(arg, "raw") == 0) 1726 sep->se_socktype = SOCK_RAW; 1727 else 1728 sep->se_socktype = -1; 1729 1730 arg = sskip(&cp); 1731 if (strncmp(arg, "tcp", 3) == 0) { 1732 sep->se_proto = newstr(strsep(&arg, "/")); 1733 if (arg != NULL && (strcmp(arg, "faith") == 0)) { 1734 syslog(LOG_ERR, "faith has been deprecated"); 1735 goto more; 1736 } 1737 } else { 1738 if (sep->se_type == NORM_TYPE && 1739 strncmp(arg, "faith/", 6) == 0) { 1740 syslog(LOG_ERR, "faith has been deprecated"); 1741 goto more; 1742 } 1743 sep->se_proto = newstr(arg); 1744 } 1745 if (strncmp(sep->se_proto, "rpc/", 4) == 0) { 1746 memmove(sep->se_proto, sep->se_proto + 4, 1747 strlen(sep->se_proto) + 1 - 4); 1748 sep->se_rpc = 1; 1749 sep->se_rpc_prog = sep->se_rpc_lowvers = 1750 sep->se_rpc_highvers = 0; 1751 if ((versp = strrchr(sep->se_service, '/'))) { 1752 *versp++ = '\0'; 1753 switch (sscanf(versp, "%u-%u", 1754 &sep->se_rpc_lowvers, 1755 &sep->se_rpc_highvers)) { 1756 case 2: 1757 break; 1758 case 1: 1759 sep->se_rpc_highvers = 1760 sep->se_rpc_lowvers; 1761 break; 1762 default: 1763 syslog(LOG_ERR, 1764 "bad RPC version specifier; %s", 1765 sep->se_service); 1766 freeconfig(sep); 1767 goto more; 1768 } 1769 } 1770 else { 1771 sep->se_rpc_lowvers = 1772 sep->se_rpc_highvers = 1; 1773 } 1774 } 1775 sep->se_nomapped = 0; 1776 if (strcmp(sep->se_proto, "unix") == 0) { 1777 sep->se_family = AF_UNIX; 1778 } else { 1779 while (isdigit(sep->se_proto[strlen(sep->se_proto) - 1])) { 1780 #ifdef INET6 1781 if (sep->se_proto[strlen(sep->se_proto) - 1] == '6') { 1782 sep->se_proto[strlen(sep->se_proto) - 1] = '\0'; 1783 v6bind = 1; 1784 continue; 1785 } 1786 #endif 1787 if (sep->se_proto[strlen(sep->se_proto) - 1] == '4') { 1788 sep->se_proto[strlen(sep->se_proto) - 1] = '\0'; 1789 #ifdef INET6 1790 v4bind = 1; 1791 #endif 1792 continue; 1793 } 1794 /* illegal version num */ 1795 syslog(LOG_ERR, "bad IP version for %s", sep->se_proto); 1796 freeconfig(sep); 1797 goto more; 1798 } 1799 #ifdef INET6 1800 if (v6bind && !v6bind_ok) { 1801 syslog(LOG_INFO, "IPv6 bind is ignored for %s", 1802 sep->se_service); 1803 if (v4bind && v4bind_ok) 1804 v6bind = 0; 1805 else { 1806 freeconfig(sep); 1807 goto more; 1808 } 1809 } 1810 if (v6bind) { 1811 sep->se_family = AF_INET6; 1812 if (!v4bind || !v4bind_ok) 1813 sep->se_nomapped = 1; 1814 } else 1815 #endif 1816 { /* default to v4 bind if not v6 bind */ 1817 if (!v4bind_ok) { 1818 syslog(LOG_NOTICE, "IPv4 bind is ignored for %s", 1819 sep->se_service); 1820 freeconfig(sep); 1821 goto more; 1822 } 1823 sep->se_family = AF_INET; 1824 } 1825 } 1826 /* init ctladdr */ 1827 switch(sep->se_family) { 1828 case AF_INET: 1829 memcpy(&sep->se_ctrladdr4, bind_sa4, 1830 sizeof(sep->se_ctrladdr4)); 1831 sep->se_ctrladdr_size = sizeof(sep->se_ctrladdr4); 1832 break; 1833 #ifdef INET6 1834 case AF_INET6: 1835 memcpy(&sep->se_ctrladdr6, bind_sa6, 1836 sizeof(sep->se_ctrladdr6)); 1837 sep->se_ctrladdr_size = sizeof(sep->se_ctrladdr6); 1838 break; 1839 #endif 1840 case AF_UNIX: 1841 #define SUN_PATH_MAXSIZE sizeof(sep->se_ctrladdr_un.sun_path) 1842 memset(&sep->se_ctrladdr, 0, sizeof(sep->se_ctrladdr)); 1843 sep->se_ctrladdr_un.sun_family = sep->se_family; 1844 if (strlcpy(sep->se_ctrladdr_un.sun_path, sep->se_service, 1845 SUN_PATH_MAXSIZE) >= SUN_PATH_MAXSIZE) { 1846 syslog(LOG_ERR, 1847 "domain socket pathname too long for service %s", 1848 sep->se_service); 1849 goto more; 1850 } 1851 #undef SUN_PATH_MAXSIZE 1852 sep->se_ctrladdr_size = sep->se_ctrladdr_un.sun_len = 1853 SUN_LEN(&sep->se_ctrladdr_un); 1854 } 1855 arg = sskip(&cp); 1856 if (!strncmp(arg, "wait", 4)) 1857 sep->se_accept = 0; 1858 else if (!strncmp(arg, "nowait", 6)) 1859 sep->se_accept = 1; 1860 else { 1861 syslog(LOG_ERR, 1862 "%s: bad wait/nowait for service %s", 1863 CONFIG, sep->se_service); 1864 goto more; 1865 } 1866 sep->se_maxchild = -1; 1867 sep->se_maxcpm = -1; 1868 sep->se_maxperip = -1; 1869 if ((s = strchr(arg, '/')) != NULL) { 1870 char *eptr; 1871 u_long val; 1872 1873 val = strtoul(s + 1, &eptr, 10); 1874 if (eptr == s + 1 || val > MAX_MAXCHLD) { 1875 syslog(LOG_ERR, 1876 "%s: bad max-child for service %s", 1877 CONFIG, sep->se_service); 1878 goto more; 1879 } 1880 if (debug) 1881 if (!sep->se_accept && val != 1) 1882 warnx("maxchild=%lu for wait service %s" 1883 " not recommended", val, sep->se_service); 1884 sep->se_maxchild = val; 1885 if (*eptr == '/') 1886 sep->se_maxcpm = strtol(eptr + 1, &eptr, 10); 1887 if (*eptr == '/') 1888 sep->se_maxperip = strtol(eptr + 1, &eptr, 10); 1889 /* 1890 * explicitly do not check for \0 for future expansion / 1891 * backwards compatibility 1892 */ 1893 } 1894 if (ISMUX(sep)) { 1895 /* 1896 * Silently enforce "nowait" mode for TCPMUX services 1897 * since they don't have an assigned port to listen on. 1898 */ 1899 sep->se_accept = 1; 1900 if (strcmp(sep->se_proto, "tcp")) { 1901 syslog(LOG_ERR, 1902 "%s: bad protocol for tcpmux service %s", 1903 CONFIG, sep->se_service); 1904 goto more; 1905 } 1906 if (sep->se_socktype != SOCK_STREAM) { 1907 syslog(LOG_ERR, 1908 "%s: bad socket type for tcpmux service %s", 1909 CONFIG, sep->se_service); 1910 goto more; 1911 } 1912 } 1913 sep->se_user = newstr(sskip(&cp)); 1914 #ifdef LOGIN_CAP 1915 if ((s = strrchr(sep->se_user, '/')) != NULL) { 1916 *s = '\0'; 1917 sep->se_class = newstr(s + 1); 1918 } else 1919 sep->se_class = newstr(RESOURCE_RC); 1920 #endif 1921 if ((s = strrchr(sep->se_user, ':')) != NULL) { 1922 *s = '\0'; 1923 sep->se_group = newstr(s + 1); 1924 } else 1925 sep->se_group = NULL; 1926 sep->se_server = newstr(sskip(&cp)); 1927 if ((sep->se_server_name = strrchr(sep->se_server, '/'))) 1928 sep->se_server_name++; 1929 if (strcmp(sep->se_server, "internal") == 0) { 1930 struct biltin *bi; 1931 1932 for (bi = biltins; bi->bi_service; bi++) 1933 if (bi->bi_socktype == sep->se_socktype && 1934 matchservent(bi->bi_service, sep->se_service, 1935 sep->se_proto)) 1936 break; 1937 if (bi->bi_service == 0) { 1938 syslog(LOG_ERR, "internal service %s unknown", 1939 sep->se_service); 1940 goto more; 1941 } 1942 sep->se_accept = 1; /* force accept mode for built-ins */ 1943 sep->se_bi = bi; 1944 } else 1945 sep->se_bi = NULL; 1946 if (sep->se_maxperip < 0) 1947 sep->se_maxperip = maxperip; 1948 if (sep->se_maxcpm < 0) 1949 sep->se_maxcpm = maxcpm; 1950 if (sep->se_maxchild < 0) { /* apply default max-children */ 1951 if (sep->se_bi && sep->se_bi->bi_maxchild >= 0) 1952 sep->se_maxchild = sep->se_bi->bi_maxchild; 1953 else if (sep->se_accept) 1954 sep->se_maxchild = MAX(maxchild, 0); 1955 else 1956 sep->se_maxchild = 1; 1957 } 1958 LIST_INIT(&sep->se_children); 1959 argc = 0; 1960 for (arg = skip(&cp); cp; arg = skip(&cp)) 1961 if (argc < MAXARGV) { 1962 sep->se_argv[argc++] = newstr(arg); 1963 } else { 1964 syslog(LOG_ERR, 1965 "%s: too many arguments for service %s", 1966 CONFIG, sep->se_service); 1967 goto more; 1968 } 1969 while (argc <= MAXARGV) 1970 sep->se_argv[argc++] = NULL; 1971 for (i = 0; i < PERIPSIZE; ++i) 1972 LIST_INIT(&sep->se_conn[i]); 1973 #ifdef IPSEC 1974 sep->se_policy = policy ? newstr(policy) : NULL; 1975 free(policy); 1976 #endif 1977 return (sep); 1978 } 1979 1980 static void 1981 freeconfig(struct servtab *cp) 1982 { 1983 struct stabchild *sc; 1984 int i; 1985 1986 free(cp->se_service); 1987 free(cp->se_proto); 1988 free(cp->se_user); 1989 free(cp->se_group); 1990 #ifdef LOGIN_CAP 1991 free(cp->se_class); 1992 #endif 1993 free(cp->se_server); 1994 while (!LIST_EMPTY(&cp->se_children)) { 1995 sc = LIST_FIRST(&cp->se_children); 1996 LIST_REMOVE(sc, sc_link); 1997 free(sc); 1998 } 1999 for (i = 0; i < MAXARGV; i++) 2000 if (cp->se_argv[i]) 2001 free(cp->se_argv[i]); 2002 free_connlist(cp); 2003 #ifdef IPSEC 2004 free(cp->se_policy); 2005 #endif 2006 } 2007 2008 2009 /* 2010 * Safe skip - if skip returns null, log a syntax error in the 2011 * configuration file and exit. 2012 */ 2013 static char * 2014 sskip(char **cpp) 2015 { 2016 char *cp; 2017 2018 cp = skip(cpp); 2019 if (cp == NULL) { 2020 syslog(LOG_ERR, "%s: syntax error", CONFIG); 2021 exit(EX_DATAERR); 2022 } 2023 return (cp); 2024 } 2025 2026 static char * 2027 skip(char **cpp) 2028 { 2029 char *cp = *cpp; 2030 char *start; 2031 char quote = '\0'; 2032 2033 again: 2034 while (*cp == ' ' || *cp == '\t') 2035 cp++; 2036 if (*cp == '\0') { 2037 int c; 2038 2039 c = getc(fconfig); 2040 (void) ungetc(c, fconfig); 2041 if (c == ' ' || c == '\t') 2042 if ((cp = nextline(fconfig))) 2043 goto again; 2044 *cpp = (char *)0; 2045 return ((char *)0); 2046 } 2047 if (*cp == '"' || *cp == '\'') 2048 quote = *cp++; 2049 start = cp; 2050 if (quote) 2051 while (*cp && *cp != quote) 2052 cp++; 2053 else 2054 while (*cp && *cp != ' ' && *cp != '\t') 2055 cp++; 2056 if (*cp != '\0') 2057 *cp++ = '\0'; 2058 *cpp = cp; 2059 return (start); 2060 } 2061 2062 static char * 2063 nextline(FILE *fd) 2064 { 2065 char *cp; 2066 2067 if (fgets(line, sizeof (line), fd) == NULL) 2068 return ((char *)0); 2069 cp = strchr(line, '\n'); 2070 if (cp) 2071 *cp = '\0'; 2072 return (line); 2073 } 2074 2075 static char * 2076 newstr(const char *cp) 2077 { 2078 char *cr; 2079 2080 if ((cr = strdup(cp != NULL ? cp : ""))) 2081 return (cr); 2082 syslog(LOG_ERR, "strdup: %m"); 2083 exit(EX_OSERR); 2084 } 2085 2086 void 2087 inetd_setproctitle(const char *a, int s) 2088 { 2089 socklen_t size; 2090 struct sockaddr_storage ss; 2091 char buf[80], pbuf[NI_MAXHOST]; 2092 2093 size = sizeof(ss); 2094 if (getpeername(s, (struct sockaddr *)&ss, &size) == 0) { 2095 getnameinfo((struct sockaddr *)&ss, size, pbuf, sizeof(pbuf), 2096 NULL, 0, NI_NUMERICHOST); 2097 (void) sprintf(buf, "%s [%s]", a, pbuf); 2098 } else 2099 (void) sprintf(buf, "%s", a); 2100 setproctitle("%s", buf); 2101 } 2102 2103 int 2104 check_loop(const struct sockaddr *sa, const struct servtab *sep) 2105 { 2106 struct servtab *se2; 2107 char pname[NI_MAXHOST]; 2108 2109 for (se2 = servtab; se2; se2 = se2->se_next) { 2110 if (!se2->se_bi || se2->se_socktype != SOCK_DGRAM) 2111 continue; 2112 2113 switch (se2->se_family) { 2114 case AF_INET: 2115 if (csatosin(sa)->sin_port == 2116 se2->se_ctrladdr4.sin_port) 2117 goto isloop; 2118 continue; 2119 #ifdef INET6 2120 case AF_INET6: 2121 if (csatosin6(sa)->sin6_port == 2122 se2->se_ctrladdr6.sin6_port) 2123 goto isloop; 2124 continue; 2125 #endif 2126 default: 2127 continue; 2128 } 2129 isloop: 2130 getnameinfo(sa, sa->sa_len, pname, sizeof(pname), NULL, 0, 2131 NI_NUMERICHOST); 2132 syslog(LOG_WARNING, "%s/%s:%s/%s loop request REFUSED from %s", 2133 sep->se_service, sep->se_proto, 2134 se2->se_service, se2->se_proto, 2135 pname); 2136 return 1; 2137 } 2138 return 0; 2139 } 2140 2141 /* 2142 * print_service: 2143 * Dump relevant information to stderr 2144 */ 2145 static void 2146 print_service(const char *action, const struct servtab *sep) 2147 { 2148 fprintf(stderr, 2149 "%s: %s proto=%s accept=%d max=%d user=%s group=%s" 2150 #ifdef LOGIN_CAP 2151 "class=%s" 2152 #endif 2153 " builtin=%p server=%s" 2154 #ifdef IPSEC 2155 " policy=\"%s\"" 2156 #endif 2157 "\n", 2158 action, sep->se_service, sep->se_proto, 2159 sep->se_accept, sep->se_maxchild, sep->se_user, sep->se_group, 2160 #ifdef LOGIN_CAP 2161 sep->se_class, 2162 #endif 2163 (void *) sep->se_bi, sep->se_server 2164 #ifdef IPSEC 2165 , (sep->se_policy ? sep->se_policy : "") 2166 #endif 2167 ); 2168 } 2169 2170 #define CPMHSIZE 256 2171 #define CPMHMASK (CPMHSIZE-1) 2172 #define CHTGRAN 10 2173 #define CHTSIZE 6 2174 2175 typedef struct CTime { 2176 unsigned long ct_Ticks; 2177 int ct_Count; 2178 } CTime; 2179 2180 typedef struct CHash { 2181 union { 2182 struct in_addr c4_Addr; 2183 struct in6_addr c6_Addr; 2184 } cu_Addr; 2185 #define ch_Addr4 cu_Addr.c4_Addr 2186 #define ch_Addr6 cu_Addr.c6_Addr 2187 int ch_Family; 2188 time_t ch_LTime; 2189 char *ch_Service; 2190 CTime ch_Times[CHTSIZE]; 2191 } CHash; 2192 2193 static CHash CHashAry[CPMHSIZE]; 2194 2195 static int 2196 cpmip(const struct servtab *sep, int ctrl) 2197 { 2198 struct sockaddr_storage rss; 2199 socklen_t rssLen = sizeof(rss); 2200 int r = 0; 2201 2202 /* 2203 * If getpeername() fails, just let it through (if logging is 2204 * enabled the condition is caught elsewhere) 2205 */ 2206 2207 if (sep->se_maxcpm > 0 && 2208 (sep->se_family == AF_INET || sep->se_family == AF_INET6) && 2209 getpeername(ctrl, (struct sockaddr *)&rss, &rssLen) == 0 ) { 2210 time_t t = time(NULL); 2211 unsigned int hv = 0xABC3D20F; 2212 int i; 2213 int cnt = 0; 2214 CHash *chBest = NULL; 2215 unsigned int ticks = t / CHTGRAN; 2216 struct sockaddr_in *sin4; 2217 #ifdef INET6 2218 struct sockaddr_in6 *sin6; 2219 #endif 2220 2221 sin4 = (struct sockaddr_in *)&rss; 2222 #ifdef INET6 2223 sin6 = (struct sockaddr_in6 *)&rss; 2224 #endif 2225 { 2226 char *p; 2227 int addrlen; 2228 2229 switch (rss.ss_family) { 2230 case AF_INET: 2231 p = (char *)&sin4->sin_addr; 2232 addrlen = sizeof(struct in_addr); 2233 break; 2234 #ifdef INET6 2235 case AF_INET6: 2236 p = (char *)&sin6->sin6_addr; 2237 addrlen = sizeof(struct in6_addr); 2238 break; 2239 #endif 2240 default: 2241 /* should not happen */ 2242 return -1; 2243 } 2244 2245 for (i = 0; i < addrlen; ++i, ++p) { 2246 hv = (hv << 5) ^ (hv >> 23) ^ *p; 2247 } 2248 hv = (hv ^ (hv >> 16)); 2249 } 2250 for (i = 0; i < 5; ++i) { 2251 CHash *ch = &CHashAry[(hv + i) & CPMHMASK]; 2252 2253 if (rss.ss_family == AF_INET && 2254 ch->ch_Family == AF_INET && 2255 sin4->sin_addr.s_addr == ch->ch_Addr4.s_addr && 2256 ch->ch_Service && strcmp(sep->se_service, 2257 ch->ch_Service) == 0) { 2258 chBest = ch; 2259 break; 2260 } 2261 #ifdef INET6 2262 if (rss.ss_family == AF_INET6 && 2263 ch->ch_Family == AF_INET6 && 2264 IN6_ARE_ADDR_EQUAL(&sin6->sin6_addr, 2265 &ch->ch_Addr6) != 0 && 2266 ch->ch_Service && strcmp(sep->se_service, 2267 ch->ch_Service) == 0) { 2268 chBest = ch; 2269 break; 2270 } 2271 #endif 2272 if (chBest == NULL || ch->ch_LTime == 0 || 2273 ch->ch_LTime < chBest->ch_LTime) { 2274 chBest = ch; 2275 } 2276 } 2277 if ((rss.ss_family == AF_INET && 2278 (chBest->ch_Family != AF_INET || 2279 sin4->sin_addr.s_addr != chBest->ch_Addr4.s_addr)) || 2280 chBest->ch_Service == NULL || 2281 strcmp(sep->se_service, chBest->ch_Service) != 0) { 2282 chBest->ch_Family = sin4->sin_family; 2283 chBest->ch_Addr4 = sin4->sin_addr; 2284 free(chBest->ch_Service); 2285 chBest->ch_Service = strdup(sep->se_service); 2286 memset(chBest->ch_Times, 0, sizeof(chBest->ch_Times)); 2287 } 2288 #ifdef INET6 2289 if ((rss.ss_family == AF_INET6 && 2290 (chBest->ch_Family != AF_INET6 || 2291 IN6_ARE_ADDR_EQUAL(&sin6->sin6_addr, 2292 &chBest->ch_Addr6) == 0)) || 2293 chBest->ch_Service == NULL || 2294 strcmp(sep->se_service, chBest->ch_Service) != 0) { 2295 chBest->ch_Family = sin6->sin6_family; 2296 chBest->ch_Addr6 = sin6->sin6_addr; 2297 free(chBest->ch_Service); 2298 chBest->ch_Service = strdup(sep->se_service); 2299 memset(chBest->ch_Times, 0, sizeof(chBest->ch_Times)); 2300 } 2301 #endif 2302 chBest->ch_LTime = t; 2303 { 2304 CTime *ct = &chBest->ch_Times[ticks % CHTSIZE]; 2305 if (ct->ct_Ticks != ticks) { 2306 ct->ct_Ticks = ticks; 2307 ct->ct_Count = 0; 2308 } 2309 ++ct->ct_Count; 2310 } 2311 for (i = 0; i < CHTSIZE; ++i) { 2312 CTime *ct = &chBest->ch_Times[i]; 2313 if (ct->ct_Ticks <= ticks && 2314 ct->ct_Ticks >= ticks - CHTSIZE) { 2315 cnt += ct->ct_Count; 2316 } 2317 } 2318 if ((cnt * 60) / (CHTSIZE * CHTGRAN) > sep->se_maxcpm) { 2319 char pname[NI_MAXHOST]; 2320 2321 getnameinfo((struct sockaddr *)&rss, 2322 ((struct sockaddr *)&rss)->sa_len, 2323 pname, sizeof(pname), NULL, 0, 2324 NI_NUMERICHOST); 2325 r = -1; 2326 syslog(LOG_ERR, 2327 "%s from %s exceeded counts/min (limit %d/min)", 2328 sep->se_service, pname, 2329 sep->se_maxcpm); 2330 } 2331 } 2332 return(r); 2333 } 2334 2335 static struct conninfo * 2336 search_conn(struct servtab *sep, int ctrl) 2337 { 2338 struct sockaddr_storage ss; 2339 socklen_t sslen = sizeof(ss); 2340 struct conninfo *conn; 2341 int hv; 2342 char pname[NI_MAXHOST], pname2[NI_MAXHOST]; 2343 2344 if (sep->se_maxperip <= 0) 2345 return NULL; 2346 2347 /* 2348 * If getpeername() fails, just let it through (if logging is 2349 * enabled the condition is caught elsewhere) 2350 */ 2351 if (getpeername(ctrl, (struct sockaddr *)&ss, &sslen) != 0) 2352 return NULL; 2353 2354 switch (ss.ss_family) { 2355 case AF_INET: 2356 hv = hashval((char *)&((struct sockaddr_in *)&ss)->sin_addr, 2357 sizeof(struct in_addr)); 2358 break; 2359 #ifdef INET6 2360 case AF_INET6: 2361 hv = hashval((char *)&((struct sockaddr_in6 *)&ss)->sin6_addr, 2362 sizeof(struct in6_addr)); 2363 break; 2364 #endif 2365 default: 2366 /* 2367 * Since we only support AF_INET and AF_INET6, just 2368 * let other than AF_INET and AF_INET6 through. 2369 */ 2370 return NULL; 2371 } 2372 2373 if (getnameinfo((struct sockaddr *)&ss, sslen, pname, sizeof(pname), 2374 NULL, 0, NI_NUMERICHOST) != 0) 2375 return NULL; 2376 2377 LIST_FOREACH(conn, &sep->se_conn[hv], co_link) { 2378 if (getnameinfo((struct sockaddr *)&conn->co_addr, 2379 conn->co_addr.ss_len, pname2, sizeof(pname2), NULL, 0, 2380 NI_NUMERICHOST) == 0 && 2381 strcmp(pname, pname2) == 0) 2382 break; 2383 } 2384 2385 if (conn == NULL) { 2386 if ((conn = malloc(sizeof(struct conninfo))) == NULL) { 2387 syslog(LOG_ERR, "malloc: %m"); 2388 exit(EX_OSERR); 2389 } 2390 conn->co_proc = reallocarray(NULL, sep->se_maxperip, 2391 sizeof(*conn->co_proc)); 2392 if (conn->co_proc == NULL) { 2393 syslog(LOG_ERR, "reallocarray: %m"); 2394 exit(EX_OSERR); 2395 } 2396 memcpy(&conn->co_addr, (struct sockaddr *)&ss, sslen); 2397 conn->co_numchild = 0; 2398 LIST_INSERT_HEAD(&sep->se_conn[hv], conn, co_link); 2399 } 2400 2401 /* 2402 * Since a child process is not invoked yet, we cannot 2403 * determine a pid of a child. So, co_proc and co_numchild 2404 * should be filled leter. 2405 */ 2406 2407 return conn; 2408 } 2409 2410 static int 2411 room_conn(struct servtab *sep, struct conninfo *conn) 2412 { 2413 char pname[NI_MAXHOST]; 2414 2415 if (conn->co_numchild >= sep->se_maxperip) { 2416 getnameinfo((struct sockaddr *)&conn->co_addr, 2417 conn->co_addr.ss_len, pname, sizeof(pname), NULL, 0, 2418 NI_NUMERICHOST); 2419 syslog(LOG_ERR, "%s from %s exceeded counts (limit %d)", 2420 sep->se_service, pname, sep->se_maxperip); 2421 return 0; 2422 } 2423 return 1; 2424 } 2425 2426 static void 2427 addchild_conn(struct conninfo *conn, pid_t pid) 2428 { 2429 struct procinfo *proc; 2430 2431 if (conn == NULL) 2432 return; 2433 2434 if ((proc = search_proc(pid, 1)) != NULL) { 2435 if (proc->pr_conn != NULL) { 2436 syslog(LOG_ERR, 2437 "addchild_conn: child already on process list"); 2438 exit(EX_OSERR); 2439 } 2440 proc->pr_conn = conn; 2441 } 2442 2443 conn->co_proc[conn->co_numchild++] = proc; 2444 } 2445 2446 static void 2447 reapchild_conn(pid_t pid) 2448 { 2449 struct procinfo *proc; 2450 struct conninfo *conn; 2451 int i; 2452 2453 if ((proc = search_proc(pid, 0)) == NULL) 2454 return; 2455 if ((conn = proc->pr_conn) == NULL) 2456 return; 2457 for (i = 0; i < conn->co_numchild; ++i) 2458 if (conn->co_proc[i] == proc) { 2459 conn->co_proc[i] = conn->co_proc[--conn->co_numchild]; 2460 break; 2461 } 2462 free_proc(proc); 2463 free_conn(conn); 2464 } 2465 2466 static void 2467 resize_conn(struct servtab *sep, int maxpip) 2468 { 2469 struct conninfo *conn; 2470 int i, j; 2471 2472 if (sep->se_maxperip <= 0) 2473 return; 2474 if (maxpip <= 0) { 2475 free_connlist(sep); 2476 return; 2477 } 2478 for (i = 0; i < PERIPSIZE; ++i) { 2479 LIST_FOREACH(conn, &sep->se_conn[i], co_link) { 2480 for (j = maxpip; j < conn->co_numchild; ++j) 2481 free_proc(conn->co_proc[j]); 2482 conn->co_proc = reallocarray(conn->co_proc, maxpip, 2483 sizeof(*conn->co_proc)); 2484 if (conn->co_proc == NULL) { 2485 syslog(LOG_ERR, "reallocarray: %m"); 2486 exit(EX_OSERR); 2487 } 2488 if (conn->co_numchild > maxpip) 2489 conn->co_numchild = maxpip; 2490 } 2491 } 2492 } 2493 2494 static void 2495 free_connlist(struct servtab *sep) 2496 { 2497 struct conninfo *conn, *conn_temp; 2498 int i, j; 2499 2500 for (i = 0; i < PERIPSIZE; ++i) { 2501 LIST_FOREACH_SAFE(conn, &sep->se_conn[i], co_link, conn_temp) { 2502 if (conn == NULL) { 2503 LIST_REMOVE(conn, co_link); 2504 continue; 2505 } 2506 for (j = 0; j < conn->co_numchild; ++j) 2507 free_proc(conn->co_proc[j]); 2508 conn->co_numchild = 0; 2509 free_conn(conn); 2510 } 2511 } 2512 } 2513 2514 static void 2515 free_conn(struct conninfo *conn) 2516 { 2517 if (conn == NULL) 2518 return; 2519 if (conn->co_numchild <= 0) { 2520 LIST_REMOVE(conn, co_link); 2521 free(conn->co_proc); 2522 free(conn); 2523 } 2524 } 2525 2526 static struct procinfo * 2527 search_proc(pid_t pid, int add) 2528 { 2529 struct procinfo *proc; 2530 int hv; 2531 2532 hv = hashval((char *)&pid, sizeof(pid)); 2533 LIST_FOREACH(proc, &proctable[hv], pr_link) { 2534 if (proc->pr_pid == pid) 2535 break; 2536 } 2537 if (proc == NULL && add) { 2538 if ((proc = malloc(sizeof(struct procinfo))) == NULL) { 2539 syslog(LOG_ERR, "malloc: %m"); 2540 exit(EX_OSERR); 2541 } 2542 proc->pr_pid = pid; 2543 proc->pr_conn = NULL; 2544 LIST_INSERT_HEAD(&proctable[hv], proc, pr_link); 2545 } 2546 return proc; 2547 } 2548 2549 static void 2550 free_proc(struct procinfo *proc) 2551 { 2552 if (proc == NULL) 2553 return; 2554 LIST_REMOVE(proc, pr_link); 2555 free(proc); 2556 } 2557 2558 static int 2559 hashval(char *p, int len) 2560 { 2561 unsigned int hv = 0xABC3D20F; 2562 int i; 2563 2564 for (i = 0; i < len; ++i, ++p) 2565 hv = (hv << 5) ^ (hv >> 23) ^ *p; 2566 hv = (hv ^ (hv >> 16)) & (PERIPSIZE - 1); 2567 return hv; 2568 } 2569