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