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][/faith,ttcp], udp[4][6], unix 73 * wait/nowait single-threaded/multi-threaded 74 * user user 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 user 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/wait.h> 114 #include <sys/time.h> 115 #include <sys/resource.h> 116 #include <sys/stat.h> 117 #include <sys/un.h> 118 119 #include <netinet/in.h> 120 #include <netinet/tcp.h> 121 #include <arpa/inet.h> 122 #include <rpc/rpc.h> 123 #include <rpc/pmap_clnt.h> 124 125 #include <ctype.h> 126 #include <errno.h> 127 #include <err.h> 128 #include <fcntl.h> 129 #include <grp.h> 130 #include <libutil.h> 131 #include <limits.h> 132 #include <netdb.h> 133 #include <pwd.h> 134 #include <signal.h> 135 #include <stdio.h> 136 #include <stdlib.h> 137 #include <string.h> 138 #include <sysexits.h> 139 #include <syslog.h> 140 #include <tcpd.h> 141 #include <unistd.h> 142 143 #include "inetd.h" 144 #include "pathnames.h" 145 146 #ifdef IPSEC 147 #include <netinet6/ipsec.h> 148 #ifndef IPSEC_POLICY_IPSEC /* no ipsec support on old ipsec */ 149 #undef IPSEC 150 #endif 151 #endif 152 153 /* wrapper for KAME-special getnameinfo() */ 154 #ifndef NI_WITHSCOPEID 155 #define NI_WITHSCOPEID 0 156 #endif 157 158 #ifndef LIBWRAP_ALLOW_FACILITY 159 # define LIBWRAP_ALLOW_FACILITY LOG_AUTH 160 #endif 161 #ifndef LIBWRAP_ALLOW_SEVERITY 162 # define LIBWRAP_ALLOW_SEVERITY LOG_INFO 163 #endif 164 #ifndef LIBWRAP_DENY_FACILITY 165 # define LIBWRAP_DENY_FACILITY LOG_AUTH 166 #endif 167 #ifndef LIBWRAP_DENY_SEVERITY 168 # define LIBWRAP_DENY_SEVERITY LOG_WARNING 169 #endif 170 171 #define ISWRAP(sep) \ 172 ( ((wrap_ex && !(sep)->se_bi) || (wrap_bi && (sep)->se_bi)) \ 173 && (sep->se_family == AF_INET || sep->se_family == AF_INET6) \ 174 && ( ((sep)->se_accept && (sep)->se_socktype == SOCK_STREAM) \ 175 || (sep)->se_socktype == SOCK_DGRAM)) 176 177 #ifdef LOGIN_CAP 178 #include <login_cap.h> 179 180 /* see init.c */ 181 #define RESOURCE_RC "daemon" 182 183 #endif 184 185 #ifndef MAXCHILD 186 #define MAXCHILD -1 /* maximum number of this service 187 < 0 = no limit */ 188 #endif 189 190 #ifndef MAXCPM 191 #define MAXCPM -1 /* rate limit invocations from a 192 single remote address, 193 < 0 = no limit */ 194 #endif 195 196 #ifndef MAXPERIP 197 #define MAXPERIP -1 /* maximum number of this service 198 from a single remote address, 199 < 0 = no limit */ 200 #endif 201 202 #ifndef TOOMANY 203 #define TOOMANY 256 /* don't start more than TOOMANY */ 204 #endif 205 #define CNT_INTVL 60 /* servers in CNT_INTVL sec. */ 206 #define RETRYTIME (60*10) /* retry after bind or server fail */ 207 #define MAX_MAXCHLD 32767 /* max allowable max children */ 208 209 #define SIGBLOCK (sigmask(SIGCHLD)|sigmask(SIGHUP)|sigmask(SIGALRM)) 210 211 void close_sep(struct servtab *); 212 void flag_signal(int); 213 void flag_config(int); 214 void config(void); 215 int cpmip(const struct servtab *, int); 216 void endconfig(void); 217 struct servtab *enter(struct servtab *); 218 void freeconfig(struct servtab *); 219 struct servtab *getconfigent(void); 220 int matchservent(const char *, const char *, const char *); 221 char *nextline(FILE *); 222 void addchild(struct servtab *, int); 223 void flag_reapchild(int); 224 void reapchild(void); 225 void enable(struct servtab *); 226 void disable(struct servtab *); 227 void flag_retry(int); 228 void retry(void); 229 int setconfig(void); 230 void setup(struct servtab *); 231 #ifdef IPSEC 232 void ipsecsetup(struct servtab *); 233 #endif 234 void unregisterrpc(register struct servtab *sep); 235 static struct conninfo *search_conn(struct servtab *sep, int ctrl); 236 static int room_conn(struct servtab *sep, struct conninfo *conn); 237 static void addchild_conn(struct conninfo *conn, pid_t pid); 238 static void reapchild_conn(pid_t pid); 239 static void free_conn(struct conninfo *conn); 240 static void resize_conn(struct servtab *sep, int maxperip); 241 static void free_connlist(struct servtab *sep); 242 static void free_proc(struct procinfo *); 243 static struct procinfo *search_proc(pid_t pid, int add); 244 static int hashval(char *p, int len); 245 246 int allow_severity; 247 int deny_severity; 248 int wrap_ex = 0; 249 int wrap_bi = 0; 250 int debug = 0; 251 int dolog = 0; 252 int maxsock; /* highest-numbered descriptor */ 253 fd_set allsock; 254 int options; 255 int timingout; 256 int toomany = TOOMANY; 257 int maxchild = MAXCHILD; 258 int maxcpm = MAXCPM; 259 int maxperip = MAXPERIP; 260 struct servent *sp; 261 struct rpcent *rpc; 262 char *hostname = NULL; 263 struct sockaddr_in *bind_sa4; 264 int v4bind_ok = 0; 265 #ifdef INET6 266 struct sockaddr_in6 *bind_sa6; 267 int v6bind_ok = 0; 268 #endif 269 int signalpipe[2]; 270 #ifdef SANITY_CHECK 271 int nsock; 272 #endif 273 uid_t euid; 274 gid_t egid; 275 mode_t mask; 276 277 struct servtab *servtab; 278 279 extern struct biltin biltins[]; 280 281 const char *CONFIG = _PATH_INETDCONF; 282 const char *pid_file = _PATH_INETDPID; 283 284 struct netconfig *udpconf, *tcpconf, *udp6conf, *tcp6conf; 285 286 static LIST_HEAD(, procinfo) proctable[PERIPSIZE]; 287 288 int 289 getvalue(const char *arg, int *value, const char *whine) 290 { 291 int tmp; 292 char *p; 293 294 tmp = strtol(arg, &p, 0); 295 if (tmp < 0 || *p) { 296 syslog(LOG_ERR, whine, arg); 297 return 1; /* failure */ 298 } 299 *value = tmp; 300 return 0; /* success */ 301 } 302 303 static sa_family_t 304 whichaf(struct request_info *req) 305 { 306 struct sockaddr *sa; 307 308 sa = (struct sockaddr *)req->client->sin; 309 if (sa == NULL) 310 return AF_UNSPEC; 311 if (sa->sa_family == AF_INET6 && 312 IN6_IS_ADDR_V4MAPPED(&((struct sockaddr_in6 *)sa)->sin6_addr)) 313 return AF_INET; 314 return sa->sa_family; 315 } 316 317 int 318 main(int argc, char **argv) 319 { 320 struct servtab *sep; 321 struct passwd *pwd; 322 struct group *grp; 323 struct sigaction sa, saalrm, sachld, sahup, sapipe; 324 int ch, dofork; 325 pid_t pid; 326 char buf[50]; 327 #ifdef LOGIN_CAP 328 login_cap_t *lc = NULL; 329 #endif 330 struct request_info req; 331 int denied; 332 char *service = NULL; 333 union { 334 struct sockaddr peer_un; 335 struct sockaddr_in peer_un4; 336 struct sockaddr_in6 peer_un6; 337 struct sockaddr_storage peer_max; 338 } p_un; 339 #define peer p_un.peer_un 340 #define peer4 p_un.peer_un4 341 #define peer6 p_un.peer_un6 342 #define peermax p_un.peer_max 343 int i; 344 struct addrinfo hints, *res; 345 const char *servname; 346 int error; 347 struct conninfo *conn; 348 349 openlog("inetd", LOG_PID | LOG_NOWAIT | LOG_PERROR, LOG_DAEMON); 350 351 while ((ch = getopt(argc, argv, "dlwWR:a:c:C:p:s:")) != -1) 352 switch(ch) { 353 case 'd': 354 debug = 1; 355 options |= SO_DEBUG; 356 break; 357 case 'l': 358 dolog = 1; 359 break; 360 case 'R': 361 getvalue(optarg, &toomany, 362 "-R %s: bad value for service invocation rate"); 363 break; 364 case 'c': 365 getvalue(optarg, &maxchild, 366 "-c %s: bad value for maximum children"); 367 break; 368 case 'C': 369 getvalue(optarg, &maxcpm, 370 "-C %s: bad value for maximum children/minute"); 371 break; 372 case 'a': 373 hostname = optarg; 374 break; 375 case 'p': 376 pid_file = optarg; 377 break; 378 case 's': 379 getvalue(optarg, &maxperip, 380 "-s %s: bad value for maximum children per source address"); 381 break; 382 case 'w': 383 wrap_ex++; 384 break; 385 case 'W': 386 wrap_bi++; 387 break; 388 case '?': 389 default: 390 syslog(LOG_ERR, 391 "usage: inetd [-dlwW] [-a address] [-R rate]" 392 " [-c maximum] [-C rate]" 393 " [-p pidfile] [conf-file]"); 394 exit(EX_USAGE); 395 } 396 /* 397 * Initialize Bind Addrs. 398 * When hostname is NULL, wild card bind addrs are obtained from 399 * getaddrinfo(). But getaddrinfo() requires at least one of 400 * hostname or servname is non NULL. 401 * So when hostname is NULL, set dummy value to servname. 402 * Since getaddrinfo() doesn't accept numeric servname, and 403 * we doesn't use ai_socktype of struct addrinfo returned 404 * from getaddrinfo(), we set dummy value to ai_socktype. 405 */ 406 servname = (hostname == NULL) ? "0" /* dummy */ : NULL; 407 408 bzero(&hints, sizeof(struct addrinfo)); 409 hints.ai_flags = AI_PASSIVE; 410 hints.ai_family = AF_UNSPEC; 411 hints.ai_socktype = SOCK_STREAM; /* dummy */ 412 error = getaddrinfo(hostname, servname, &hints, &res); 413 if (error != 0) { 414 syslog(LOG_ERR, "-a %s: %s", hostname, gai_strerror(error)); 415 if (error == EAI_SYSTEM) 416 syslog(LOG_ERR, "%s", strerror(errno)); 417 exit(EX_USAGE); 418 } 419 do { 420 if (res->ai_addr == NULL) { 421 syslog(LOG_ERR, "-a %s: getaddrinfo failed", hostname); 422 exit(EX_USAGE); 423 } 424 switch (res->ai_addr->sa_family) { 425 case AF_INET: 426 if (v4bind_ok) 427 continue; 428 bind_sa4 = (struct sockaddr_in *)res->ai_addr; 429 /* init port num in case servname is dummy */ 430 bind_sa4->sin_port = 0; 431 v4bind_ok = 1; 432 continue; 433 #ifdef INET6 434 case AF_INET6: 435 if (v6bind_ok) 436 continue; 437 bind_sa6 = (struct sockaddr_in6 *)res->ai_addr; 438 /* init port num in case servname is dummy */ 439 bind_sa6->sin6_port = 0; 440 v6bind_ok = 1; 441 continue; 442 #endif 443 } 444 if (v4bind_ok 445 #ifdef INET6 446 && v6bind_ok 447 #endif 448 ) 449 break; 450 } while ((res = res->ai_next) != NULL); 451 if (!v4bind_ok 452 #ifdef INET6 453 && !v6bind_ok 454 #endif 455 ) { 456 syslog(LOG_ERR, "-a %s: unknown address family", hostname); 457 exit(EX_USAGE); 458 } 459 460 euid = geteuid(); 461 egid = getegid(); 462 umask(mask = umask(0777)); 463 464 argc -= optind; 465 argv += optind; 466 467 if (argc > 0) 468 CONFIG = argv[0]; 469 if (access(CONFIG, R_OK) < 0) 470 syslog(LOG_ERR, "Accessing %s: %m, continuing anyway.", CONFIG); 471 if (debug == 0) { 472 FILE *fp; 473 if (daemon(0, 0) < 0) { 474 syslog(LOG_WARNING, "daemon(0,0) failed: %m"); 475 } 476 /* From now on we don't want syslog messages going to stderr. */ 477 closelog(); 478 openlog("inetd", LOG_PID | LOG_NOWAIT, LOG_DAEMON); 479 /* 480 * In case somebody has started inetd manually, we need to 481 * clear the logname, so that old servers run as root do not 482 * get the user's logname.. 483 */ 484 if (setlogin("") < 0) { 485 syslog(LOG_WARNING, "cannot clear logname: %m"); 486 /* no big deal if it fails.. */ 487 } 488 pid = getpid(); 489 fp = fopen(pid_file, "w"); 490 if (fp) { 491 fprintf(fp, "%ld\n", (long)pid); 492 fclose(fp); 493 } else { 494 syslog(LOG_WARNING, "%s: %m", pid_file); 495 } 496 } 497 498 for (i = 0; i < PERIPSIZE; ++i) 499 LIST_INIT(&proctable[i]); 500 501 if (v4bind_ok) { 502 udpconf = getnetconfigent("udp"); 503 tcpconf = getnetconfigent("tcp"); 504 if (udpconf == NULL || tcpconf == NULL) { 505 syslog(LOG_ERR, "unknown rpc/udp or rpc/tcp"); 506 exit(EX_USAGE); 507 } 508 } 509 #ifdef INET6 510 if (v6bind_ok) { 511 udp6conf = getnetconfigent("udp6"); 512 tcp6conf = getnetconfigent("tcp6"); 513 if (udp6conf == NULL || tcp6conf == NULL) { 514 syslog(LOG_ERR, "unknown rpc/udp6 or rpc/tcp6"); 515 exit(EX_USAGE); 516 } 517 } 518 #endif 519 520 sa.sa_flags = 0; 521 sigemptyset(&sa.sa_mask); 522 sigaddset(&sa.sa_mask, SIGALRM); 523 sigaddset(&sa.sa_mask, SIGCHLD); 524 sigaddset(&sa.sa_mask, SIGHUP); 525 sa.sa_handler = flag_retry; 526 sigaction(SIGALRM, &sa, &saalrm); 527 config(); 528 sa.sa_handler = flag_config; 529 sigaction(SIGHUP, &sa, &sahup); 530 sa.sa_handler = flag_reapchild; 531 sigaction(SIGCHLD, &sa, &sachld); 532 sa.sa_handler = SIG_IGN; 533 sigaction(SIGPIPE, &sa, &sapipe); 534 535 { 536 /* space for daemons to overwrite environment for ps */ 537 #define DUMMYSIZE 100 538 char dummy[DUMMYSIZE]; 539 540 (void)memset(dummy, 'x', DUMMYSIZE - 1); 541 dummy[DUMMYSIZE - 1] = '\0'; 542 (void)setenv("inetd_dummy", dummy, 1); 543 } 544 545 if (pipe(signalpipe) != 0) { 546 syslog(LOG_ERR, "pipe: %m"); 547 exit(EX_OSERR); 548 } 549 if (fcntl(signalpipe[0], F_SETFD, FD_CLOEXEC) < 0 || 550 fcntl(signalpipe[1], F_SETFD, FD_CLOEXEC) < 0) { 551 syslog(LOG_ERR, "signalpipe: fcntl (F_SETFD, FD_CLOEXEC): %m"); 552 exit(EX_OSERR); 553 } 554 FD_SET(signalpipe[0], &allsock); 555 #ifdef SANITY_CHECK 556 nsock++; 557 #endif 558 if (signalpipe[0] > maxsock) 559 maxsock = signalpipe[0]; 560 if (signalpipe[1] > maxsock) 561 maxsock = signalpipe[1]; 562 563 for (;;) { 564 int n, ctrl; 565 fd_set readable; 566 567 #ifdef SANITY_CHECK 568 if (nsock == 0) { 569 syslog(LOG_ERR, "%s: nsock=0", __func__); 570 exit(EX_SOFTWARE); 571 } 572 #endif 573 readable = allsock; 574 if ((n = select(maxsock + 1, &readable, (fd_set *)0, 575 (fd_set *)0, (struct timeval *)0)) <= 0) { 576 if (n < 0 && errno != EINTR) { 577 syslog(LOG_WARNING, "select: %m"); 578 sleep(1); 579 } 580 continue; 581 } 582 /* handle any queued signal flags */ 583 if (FD_ISSET(signalpipe[0], &readable)) { 584 int nsig; 585 if (ioctl(signalpipe[0], FIONREAD, &nsig) != 0) { 586 syslog(LOG_ERR, "ioctl: %m"); 587 exit(EX_OSERR); 588 } 589 while (--nsig >= 0) { 590 char c; 591 if (read(signalpipe[0], &c, 1) != 1) { 592 syslog(LOG_ERR, "read: %m"); 593 exit(EX_OSERR); 594 } 595 if (debug) 596 warnx("handling signal flag %c", c); 597 switch(c) { 598 case 'A': /* sigalrm */ 599 retry(); 600 break; 601 case 'C': /* sigchld */ 602 reapchild(); 603 break; 604 case 'H': /* sighup */ 605 config(); 606 break; 607 } 608 } 609 } 610 for (sep = servtab; n && sep; sep = sep->se_next) 611 if (sep->se_fd != -1 && FD_ISSET(sep->se_fd, &readable)) { 612 n--; 613 if (debug) 614 warnx("someone wants %s", sep->se_service); 615 dofork = !sep->se_bi || sep->se_bi->bi_fork || ISWRAP(sep); 616 conn = NULL; 617 if (sep->se_accept && sep->se_socktype == SOCK_STREAM) { 618 i = 1; 619 if (ioctl(sep->se_fd, FIONBIO, &i) < 0) 620 syslog(LOG_ERR, "ioctl (FIONBIO, 1): %m"); 621 ctrl = accept(sep->se_fd, (struct sockaddr *)0, 622 (socklen_t *)0); 623 if (debug) 624 warnx("accept, ctrl %d", ctrl); 625 if (ctrl < 0) { 626 if (errno != EINTR) 627 syslog(LOG_WARNING, 628 "accept (for %s): %m", 629 sep->se_service); 630 if (sep->se_accept && 631 sep->se_socktype == SOCK_STREAM) 632 close(ctrl); 633 continue; 634 } 635 i = 0; 636 if (ioctl(sep->se_fd, FIONBIO, &i) < 0) 637 syslog(LOG_ERR, "ioctl1(FIONBIO, 0): %m"); 638 if (ioctl(ctrl, FIONBIO, &i) < 0) 639 syslog(LOG_ERR, "ioctl2(FIONBIO, 0): %m"); 640 if (cpmip(sep, ctrl) < 0) { 641 close(ctrl); 642 continue; 643 } 644 if (dofork && 645 (conn = search_conn(sep, ctrl)) != NULL && 646 !room_conn(sep, conn)) { 647 close(ctrl); 648 continue; 649 } 650 } else 651 ctrl = sep->se_fd; 652 if (dolog && !ISWRAP(sep)) { 653 char pname[INET6_ADDRSTRLEN] = "unknown"; 654 socklen_t sl; 655 sl = sizeof peermax; 656 if (getpeername(ctrl, (struct sockaddr *) 657 &peermax, &sl)) { 658 sl = sizeof peermax; 659 if (recvfrom(ctrl, buf, sizeof(buf), 660 MSG_PEEK, 661 (struct sockaddr *)&peermax, 662 &sl) >= 0) { 663 getnameinfo((struct sockaddr *)&peermax, 664 peer.sa_len, 665 pname, sizeof(pname), 666 NULL, 0, 667 NI_NUMERICHOST| 668 NI_WITHSCOPEID); 669 } 670 } else { 671 getnameinfo((struct sockaddr *)&peermax, 672 peer.sa_len, 673 pname, sizeof(pname), 674 NULL, 0, 675 NI_NUMERICHOST| 676 NI_WITHSCOPEID); 677 } 678 syslog(LOG_INFO,"%s from %s", sep->se_service, pname); 679 } 680 (void) sigblock(SIGBLOCK); 681 pid = 0; 682 /* 683 * Fork for all external services, builtins which need to 684 * fork and anything we're wrapping (as wrapping might 685 * block or use hosts_options(5) twist). 686 */ 687 if (dofork) { 688 if (sep->se_count++ == 0) 689 (void)gettimeofday(&sep->se_time, (struct timezone *)NULL); 690 else if (toomany > 0 && sep->se_count >= toomany) { 691 struct timeval now; 692 693 (void)gettimeofday(&now, (struct timezone *)NULL); 694 if (now.tv_sec - sep->se_time.tv_sec > 695 CNT_INTVL) { 696 sep->se_time = now; 697 sep->se_count = 1; 698 } else { 699 syslog(LOG_ERR, 700 "%s/%s server failing (looping), service terminated", 701 sep->se_service, sep->se_proto); 702 if (sep->se_accept && 703 sep->se_socktype == SOCK_STREAM) 704 close(ctrl); 705 close_sep(sep); 706 free_conn(conn); 707 sigsetmask(0L); 708 if (!timingout) { 709 timingout = 1; 710 alarm(RETRYTIME); 711 } 712 continue; 713 } 714 } 715 pid = fork(); 716 } 717 if (pid < 0) { 718 syslog(LOG_ERR, "fork: %m"); 719 if (sep->se_accept && 720 sep->se_socktype == SOCK_STREAM) 721 close(ctrl); 722 free_conn(conn); 723 sigsetmask(0L); 724 sleep(1); 725 continue; 726 } 727 if (pid) { 728 addchild_conn(conn, pid); 729 addchild(sep, pid); 730 } 731 sigsetmask(0L); 732 if (pid == 0) { 733 if (dofork) { 734 sigaction(SIGALRM, &saalrm, (struct sigaction *)0); 735 sigaction(SIGCHLD, &sachld, (struct sigaction *)0); 736 sigaction(SIGHUP, &sahup, (struct sigaction *)0); 737 /* SIGPIPE reset before exec */ 738 } 739 /* 740 * Call tcpmux to find the real service to exec. 741 */ 742 if (sep->se_bi && 743 sep->se_bi->bi_fn == (bi_fn_t *) tcpmux) { 744 sep = tcpmux(ctrl); 745 if (sep == NULL) { 746 close(ctrl); 747 _exit(0); 748 } 749 } 750 if (ISWRAP(sep)) { 751 inetd_setproctitle("wrapping", ctrl); 752 service = sep->se_server_name ? 753 sep->se_server_name : sep->se_service; 754 request_init(&req, RQ_DAEMON, service, RQ_FILE, ctrl, 0); 755 fromhost(&req); 756 deny_severity = LIBWRAP_DENY_FACILITY|LIBWRAP_DENY_SEVERITY; 757 allow_severity = LIBWRAP_ALLOW_FACILITY|LIBWRAP_ALLOW_SEVERITY; 758 denied = !hosts_access(&req); 759 if (denied) { 760 syslog(deny_severity, 761 "refused connection from %.500s, service %s (%s%s)", 762 eval_client(&req), service, sep->se_proto, 763 (whichaf(&req) == AF_INET6) ? "6" : ""); 764 if (sep->se_socktype != SOCK_STREAM) 765 recv(ctrl, buf, sizeof (buf), 0); 766 if (dofork) { 767 sleep(1); 768 _exit(0); 769 } 770 } 771 if (dolog) { 772 syslog(allow_severity, 773 "connection from %.500s, service %s (%s%s)", 774 eval_client(&req), service, sep->se_proto, 775 (whichaf(&req) == AF_INET6) ? "6" : ""); 776 } 777 } 778 if (sep->se_bi) { 779 (*sep->se_bi->bi_fn)(ctrl, sep); 780 } else { 781 if (debug) 782 warnx("%d execl %s", 783 getpid(), sep->se_server); 784 /* Clear close-on-exec. */ 785 if (fcntl(ctrl, F_SETFD, 0) < 0) { 786 syslog(LOG_ERR, 787 "%s/%s: fcntl (F_SETFD, 0): %m", 788 sep->se_service, sep->se_proto); 789 _exit(EX_OSERR); 790 } 791 if (ctrl != 0) { 792 dup2(ctrl, 0); 793 close(ctrl); 794 } 795 dup2(0, 1); 796 dup2(0, 2); 797 if ((pwd = getpwnam(sep->se_user)) == NULL) { 798 syslog(LOG_ERR, 799 "%s/%s: %s: no such user", 800 sep->se_service, sep->se_proto, 801 sep->se_user); 802 if (sep->se_socktype != SOCK_STREAM) 803 recv(0, buf, sizeof (buf), 0); 804 _exit(EX_NOUSER); 805 } 806 grp = NULL; 807 if ( sep->se_group != NULL 808 && (grp = getgrnam(sep->se_group)) == NULL 809 ) { 810 syslog(LOG_ERR, 811 "%s/%s: %s: no such group", 812 sep->se_service, sep->se_proto, 813 sep->se_group); 814 if (sep->se_socktype != SOCK_STREAM) 815 recv(0, buf, sizeof (buf), 0); 816 _exit(EX_NOUSER); 817 } 818 if (grp != NULL) 819 pwd->pw_gid = grp->gr_gid; 820 #ifdef LOGIN_CAP 821 if ((lc = login_getclass(sep->se_class)) == NULL) { 822 /* error syslogged by getclass */ 823 syslog(LOG_ERR, 824 "%s/%s: %s: login class error", 825 sep->se_service, sep->se_proto, 826 sep->se_class); 827 if (sep->se_socktype != SOCK_STREAM) 828 recv(0, buf, sizeof (buf), 0); 829 _exit(EX_NOUSER); 830 } 831 #endif 832 if (setsid() < 0) { 833 syslog(LOG_ERR, 834 "%s: can't setsid(): %m", 835 sep->se_service); 836 /* _exit(EX_OSERR); not fatal yet */ 837 } 838 #ifdef LOGIN_CAP 839 if (setusercontext(lc, pwd, pwd->pw_uid, 840 LOGIN_SETALL & ~LOGIN_SETMAC) 841 != 0) { 842 syslog(LOG_ERR, 843 "%s: can't setusercontext(..%s..): %m", 844 sep->se_service, sep->se_user); 845 _exit(EX_OSERR); 846 } 847 login_close(lc); 848 #else 849 if (pwd->pw_uid) { 850 if (setlogin(sep->se_user) < 0) { 851 syslog(LOG_ERR, 852 "%s: can't setlogin(%s): %m", 853 sep->se_service, sep->se_user); 854 /* _exit(EX_OSERR); not yet */ 855 } 856 if (setgid(pwd->pw_gid) < 0) { 857 syslog(LOG_ERR, 858 "%s: can't set gid %d: %m", 859 sep->se_service, pwd->pw_gid); 860 _exit(EX_OSERR); 861 } 862 (void) initgroups(pwd->pw_name, 863 pwd->pw_gid); 864 if (setuid(pwd->pw_uid) < 0) { 865 syslog(LOG_ERR, 866 "%s: can't set uid %d: %m", 867 sep->se_service, pwd->pw_uid); 868 _exit(EX_OSERR); 869 } 870 } 871 #endif 872 sigaction(SIGPIPE, &sapipe, 873 (struct sigaction *)0); 874 execv(sep->se_server, sep->se_argv); 875 syslog(LOG_ERR, 876 "cannot execute %s: %m", sep->se_server); 877 if (sep->se_socktype != SOCK_STREAM) 878 recv(0, buf, sizeof (buf), 0); 879 } 880 if (dofork) 881 _exit(0); 882 } 883 if (sep->se_accept && sep->se_socktype == SOCK_STREAM) 884 close(ctrl); 885 } 886 } 887 } 888 889 /* 890 * Add a signal flag to the signal flag queue for later handling 891 */ 892 893 void 894 flag_signal(int c) 895 { 896 char ch = c; 897 898 if (write(signalpipe[1], &ch, 1) != 1) { 899 syslog(LOG_ERR, "write: %m"); 900 _exit(EX_OSERR); 901 } 902 } 903 904 /* 905 * Record a new child pid for this service. If we've reached the 906 * limit on children, then stop accepting incoming requests. 907 */ 908 909 void 910 addchild(struct servtab *sep, pid_t pid) 911 { 912 if (sep->se_maxchild <= 0) 913 return; 914 #ifdef SANITY_CHECK 915 if (sep->se_numchild >= sep->se_maxchild) { 916 syslog(LOG_ERR, "%s: %d >= %d", 917 __func__, sep->se_numchild, sep->se_maxchild); 918 exit(EX_SOFTWARE); 919 } 920 #endif 921 sep->se_pids[sep->se_numchild++] = pid; 922 if (sep->se_numchild == sep->se_maxchild) 923 disable(sep); 924 } 925 926 /* 927 * Some child process has exited. See if it's on somebody's list. 928 */ 929 930 void 931 flag_reapchild(int signo __unused) 932 { 933 flag_signal('C'); 934 } 935 936 void 937 reapchild(void) 938 { 939 int k, status; 940 pid_t pid; 941 struct servtab *sep; 942 943 for (;;) { 944 pid = wait3(&status, WNOHANG, (struct rusage *)0); 945 if (pid <= 0) 946 break; 947 if (debug) 948 warnx("%d reaped, %s %u", pid, 949 WIFEXITED(status) ? "status" : "signal", 950 WIFEXITED(status) ? WEXITSTATUS(status) 951 : WTERMSIG(status)); 952 for (sep = servtab; sep; sep = sep->se_next) { 953 for (k = 0; k < sep->se_numchild; k++) 954 if (sep->se_pids[k] == pid) 955 break; 956 if (k == sep->se_numchild) 957 continue; 958 if (sep->se_numchild == sep->se_maxchild) 959 enable(sep); 960 sep->se_pids[k] = sep->se_pids[--sep->se_numchild]; 961 if (WIFSIGNALED(status) || WEXITSTATUS(status)) 962 syslog(LOG_WARNING, 963 "%s[%d]: exited, %s %u", 964 sep->se_server, pid, 965 WIFEXITED(status) ? "status" : "signal", 966 WIFEXITED(status) ? WEXITSTATUS(status) 967 : WTERMSIG(status)); 968 break; 969 } 970 reapchild_conn(pid); 971 } 972 } 973 974 void 975 flag_config(int signo __unused) 976 { 977 flag_signal('H'); 978 } 979 980 void 981 config(void) 982 { 983 struct servtab *sep, *new, **sepp; 984 long omask; 985 int new_nomapped; 986 #ifdef LOGIN_CAP 987 login_cap_t *lc = NULL; 988 #endif 989 990 if (!setconfig()) { 991 syslog(LOG_ERR, "%s: %m", CONFIG); 992 return; 993 } 994 for (sep = servtab; sep; sep = sep->se_next) 995 sep->se_checked = 0; 996 while ((new = getconfigent())) { 997 if (getpwnam(new->se_user) == NULL) { 998 syslog(LOG_ERR, 999 "%s/%s: no such user '%s', service ignored", 1000 new->se_service, new->se_proto, new->se_user); 1001 continue; 1002 } 1003 if (new->se_group && getgrnam(new->se_group) == NULL) { 1004 syslog(LOG_ERR, 1005 "%s/%s: no such group '%s', service ignored", 1006 new->se_service, new->se_proto, new->se_group); 1007 continue; 1008 } 1009 #ifdef LOGIN_CAP 1010 if ((lc = login_getclass(new->se_class)) == NULL) { 1011 /* error syslogged by getclass */ 1012 syslog(LOG_ERR, 1013 "%s/%s: %s: login class error, service ignored", 1014 new->se_service, new->se_proto, new->se_class); 1015 continue; 1016 } 1017 login_close(lc); 1018 #endif 1019 new_nomapped = new->se_nomapped; 1020 for (sep = servtab; sep; sep = sep->se_next) 1021 if (strcmp(sep->se_service, new->se_service) == 0 && 1022 strcmp(sep->se_proto, new->se_proto) == 0 && 1023 sep->se_rpc == new->se_rpc && 1024 sep->se_socktype == new->se_socktype && 1025 sep->se_family == new->se_family) 1026 break; 1027 if (sep != 0) { 1028 int i; 1029 1030 #define SWAP(t,a, b) { t c = a; a = b; b = c; } 1031 omask = sigblock(SIGBLOCK); 1032 if (sep->se_nomapped != new->se_nomapped) { 1033 /* for rpc keep old nommaped till unregister */ 1034 if (!sep->se_rpc) 1035 sep->se_nomapped = new->se_nomapped; 1036 sep->se_reset = 1; 1037 } 1038 /* copy over outstanding child pids */ 1039 if (sep->se_maxchild > 0 && new->se_maxchild > 0) { 1040 new->se_numchild = sep->se_numchild; 1041 if (new->se_numchild > new->se_maxchild) 1042 new->se_numchild = new->se_maxchild; 1043 memcpy(new->se_pids, sep->se_pids, 1044 new->se_numchild * sizeof(*new->se_pids)); 1045 } 1046 SWAP(pid_t *, sep->se_pids, new->se_pids); 1047 sep->se_maxchild = new->se_maxchild; 1048 sep->se_numchild = new->se_numchild; 1049 sep->se_maxcpm = new->se_maxcpm; 1050 resize_conn(sep, new->se_maxperip); 1051 sep->se_maxperip = new->se_maxperip; 1052 sep->se_bi = new->se_bi; 1053 /* might need to turn on or off service now */ 1054 if (sep->se_fd >= 0) { 1055 if (sep->se_maxchild > 0 1056 && sep->se_numchild == sep->se_maxchild) { 1057 if (FD_ISSET(sep->se_fd, &allsock)) 1058 disable(sep); 1059 } else { 1060 if (!FD_ISSET(sep->se_fd, &allsock)) 1061 enable(sep); 1062 } 1063 } 1064 sep->se_accept = new->se_accept; 1065 SWAP(char *, sep->se_user, new->se_user); 1066 SWAP(char *, sep->se_group, new->se_group); 1067 #ifdef LOGIN_CAP 1068 SWAP(char *, sep->se_class, new->se_class); 1069 #endif 1070 SWAP(char *, sep->se_server, new->se_server); 1071 SWAP(char *, sep->se_server_name, new->se_server_name); 1072 for (i = 0; i < MAXARGV; i++) 1073 SWAP(char *, sep->se_argv[i], new->se_argv[i]); 1074 #ifdef IPSEC 1075 SWAP(char *, sep->se_policy, new->se_policy); 1076 ipsecsetup(sep); 1077 #endif 1078 sigsetmask(omask); 1079 freeconfig(new); 1080 if (debug) 1081 print_service("REDO", sep); 1082 } else { 1083 sep = enter(new); 1084 if (debug) 1085 print_service("ADD ", sep); 1086 } 1087 sep->se_checked = 1; 1088 if (ISMUX(sep)) { 1089 sep->se_fd = -1; 1090 continue; 1091 } 1092 switch (sep->se_family) { 1093 case AF_INET: 1094 if (!v4bind_ok) { 1095 sep->se_fd = -1; 1096 continue; 1097 } 1098 break; 1099 #ifdef INET6 1100 case AF_INET6: 1101 if (!v6bind_ok) { 1102 sep->se_fd = -1; 1103 continue; 1104 } 1105 break; 1106 #endif 1107 } 1108 if (!sep->se_rpc) { 1109 if (sep->se_family != AF_UNIX) { 1110 sp = getservbyname(sep->se_service, sep->se_proto); 1111 if (sp == 0) { 1112 syslog(LOG_ERR, "%s/%s: unknown service", 1113 sep->se_service, sep->se_proto); 1114 sep->se_checked = 0; 1115 continue; 1116 } 1117 } 1118 switch (sep->se_family) { 1119 case AF_INET: 1120 if (sp->s_port != sep->se_ctrladdr4.sin_port) { 1121 sep->se_ctrladdr4.sin_port = 1122 sp->s_port; 1123 sep->se_reset = 1; 1124 } 1125 break; 1126 #ifdef INET6 1127 case AF_INET6: 1128 if (sp->s_port != 1129 sep->se_ctrladdr6.sin6_port) { 1130 sep->se_ctrladdr6.sin6_port = 1131 sp->s_port; 1132 sep->se_reset = 1; 1133 } 1134 break; 1135 #endif 1136 } 1137 if (sep->se_reset != 0 && sep->se_fd >= 0) 1138 close_sep(sep); 1139 } else { 1140 rpc = getrpcbyname(sep->se_service); 1141 if (rpc == 0) { 1142 syslog(LOG_ERR, "%s/%s unknown RPC service", 1143 sep->se_service, sep->se_proto); 1144 if (sep->se_fd != -1) 1145 (void) close(sep->se_fd); 1146 sep->se_fd = -1; 1147 continue; 1148 } 1149 if (sep->se_reset != 0 || 1150 rpc->r_number != sep->se_rpc_prog) { 1151 if (sep->se_rpc_prog) 1152 unregisterrpc(sep); 1153 sep->se_rpc_prog = rpc->r_number; 1154 if (sep->se_fd != -1) 1155 (void) close(sep->se_fd); 1156 sep->se_fd = -1; 1157 } 1158 sep->se_nomapped = new_nomapped; 1159 } 1160 sep->se_reset = 0; 1161 if (sep->se_fd == -1) 1162 setup(sep); 1163 } 1164 endconfig(); 1165 /* 1166 * Purge anything not looked at above. 1167 */ 1168 omask = sigblock(SIGBLOCK); 1169 sepp = &servtab; 1170 while ((sep = *sepp)) { 1171 if (sep->se_checked) { 1172 sepp = &sep->se_next; 1173 continue; 1174 } 1175 *sepp = sep->se_next; 1176 if (sep->se_fd >= 0) 1177 close_sep(sep); 1178 if (debug) 1179 print_service("FREE", sep); 1180 if (sep->se_rpc && sep->se_rpc_prog > 0) 1181 unregisterrpc(sep); 1182 freeconfig(sep); 1183 free(sep); 1184 } 1185 (void) sigsetmask(omask); 1186 } 1187 1188 void 1189 unregisterrpc(struct servtab *sep) 1190 { 1191 u_int i; 1192 struct servtab *sepp; 1193 long omask; 1194 struct netconfig *netid4, *netid6; 1195 1196 omask = sigblock(SIGBLOCK); 1197 netid4 = sep->se_socktype == SOCK_DGRAM ? udpconf : tcpconf; 1198 netid6 = sep->se_socktype == SOCK_DGRAM ? udp6conf : tcp6conf; 1199 if (sep->se_family == AF_INET) 1200 netid6 = NULL; 1201 else if (sep->se_nomapped) 1202 netid4 = NULL; 1203 /* 1204 * Conflict if same prog and protocol - In that case one should look 1205 * to versions, but it is not interesting: having separate servers for 1206 * different versions does not work well. 1207 * Therefore one do not unregister if there is a conflict. 1208 * There is also transport conflict if destroying INET when INET46 1209 * exists, or destroying INET46 when INET exists 1210 */ 1211 for (sepp = servtab; sepp; sepp = sepp->se_next) { 1212 if (sepp == sep) 1213 continue; 1214 if (sepp->se_checked == 0 || 1215 !sepp->se_rpc || 1216 strcmp(sep->se_proto, sepp->se_proto) != 0 || 1217 sep->se_rpc_prog != sepp->se_rpc_prog) 1218 continue; 1219 if (sepp->se_family == AF_INET) 1220 netid4 = NULL; 1221 if (sepp->se_family == AF_INET6) { 1222 netid6 = NULL; 1223 if (!sep->se_nomapped) 1224 netid4 = NULL; 1225 } 1226 if (netid4 == NULL && netid6 == NULL) 1227 return; 1228 } 1229 if (debug) 1230 print_service("UNREG", sep); 1231 for (i = sep->se_rpc_lowvers; i <= sep->se_rpc_highvers; i++) { 1232 if (netid4) 1233 rpcb_unset(sep->se_rpc_prog, i, netid4); 1234 if (netid6) 1235 rpcb_unset(sep->se_rpc_prog, i, netid6); 1236 } 1237 if (sep->se_fd != -1) 1238 (void) close(sep->se_fd); 1239 sep->se_fd = -1; 1240 (void) sigsetmask(omask); 1241 } 1242 1243 void 1244 flag_retry(int signo __unused) 1245 { 1246 flag_signal('A'); 1247 } 1248 1249 void 1250 retry(void) 1251 { 1252 struct servtab *sep; 1253 1254 timingout = 0; 1255 for (sep = servtab; sep; sep = sep->se_next) 1256 if (sep->se_fd == -1 && !ISMUX(sep)) 1257 setup(sep); 1258 } 1259 1260 void 1261 setup(struct servtab *sep) 1262 { 1263 int on = 1; 1264 1265 if ((sep->se_fd = socket(sep->se_family, sep->se_socktype, 0)) < 0) { 1266 if (debug) 1267 warn("socket failed on %s/%s", 1268 sep->se_service, sep->se_proto); 1269 syslog(LOG_ERR, "%s/%s: socket: %m", 1270 sep->se_service, sep->se_proto); 1271 return; 1272 } 1273 /* Set all listening sockets to close-on-exec. */ 1274 if (fcntl(sep->se_fd, F_SETFD, FD_CLOEXEC) < 0) { 1275 syslog(LOG_ERR, "%s/%s: fcntl (F_SETFD, FD_CLOEXEC): %m", 1276 sep->se_service, sep->se_proto); 1277 close(sep->se_fd); 1278 return; 1279 } 1280 #define turnon(fd, opt) \ 1281 setsockopt(fd, SOL_SOCKET, opt, (char *)&on, sizeof (on)) 1282 if (strcmp(sep->se_proto, "tcp") == 0 && (options & SO_DEBUG) && 1283 turnon(sep->se_fd, SO_DEBUG) < 0) 1284 syslog(LOG_ERR, "setsockopt (SO_DEBUG): %m"); 1285 if (turnon(sep->se_fd, SO_REUSEADDR) < 0) 1286 syslog(LOG_ERR, "setsockopt (SO_REUSEADDR): %m"); 1287 #ifdef SO_PRIVSTATE 1288 if (turnon(sep->se_fd, SO_PRIVSTATE) < 0) 1289 syslog(LOG_ERR, "setsockopt (SO_PRIVSTATE): %m"); 1290 #endif 1291 /* tftpd opens a new connection then needs more infos */ 1292 if ((sep->se_family == AF_INET6) && 1293 (strcmp(sep->se_proto, "udp") == 0) && 1294 (sep->se_accept == 0) && 1295 (setsockopt(sep->se_fd, IPPROTO_IPV6, IPV6_RECVPKTINFO, 1296 (char *)&on, sizeof (on)) < 0)) 1297 syslog(LOG_ERR, "setsockopt (IPV6_RECVPKTINFO): %m"); 1298 if (sep->se_family == AF_INET6) { 1299 int flag = sep->se_nomapped ? 1 : 0; 1300 if (setsockopt(sep->se_fd, IPPROTO_IPV6, IPV6_V6ONLY, 1301 (char *)&flag, sizeof (flag)) < 0) 1302 syslog(LOG_ERR, "setsockopt (IPV6_V6ONLY): %m"); 1303 } 1304 #undef turnon 1305 if (sep->se_type == TTCP_TYPE) 1306 if (setsockopt(sep->se_fd, IPPROTO_TCP, TCP_NOPUSH, 1307 (char *)&on, sizeof (on)) < 0) 1308 syslog(LOG_ERR, "setsockopt (TCP_NOPUSH): %m"); 1309 #ifdef IPV6_FAITH 1310 if (sep->se_type == FAITH_TYPE) { 1311 if (setsockopt(sep->se_fd, IPPROTO_IPV6, IPV6_FAITH, &on, 1312 sizeof(on)) < 0) { 1313 syslog(LOG_ERR, "setsockopt (IPV6_FAITH): %m"); 1314 } 1315 } 1316 #endif 1317 #ifdef IPSEC 1318 ipsecsetup(sep); 1319 #endif 1320 if (sep->se_family == AF_UNIX) { 1321 (void) unlink(sep->se_ctrladdr_un.sun_path); 1322 umask(0777); /* Make socket with conservative permissions */ 1323 } 1324 if (bind(sep->se_fd, (struct sockaddr *)&sep->se_ctrladdr, 1325 sep->se_ctrladdr_size) < 0) { 1326 if (debug) 1327 warn("bind failed on %s/%s", 1328 sep->se_service, sep->se_proto); 1329 syslog(LOG_ERR, "%s/%s: bind: %m", 1330 sep->se_service, sep->se_proto); 1331 (void) close(sep->se_fd); 1332 sep->se_fd = -1; 1333 if (!timingout) { 1334 timingout = 1; 1335 alarm(RETRYTIME); 1336 } 1337 if (sep->se_family == AF_UNIX) 1338 umask(mask); 1339 return; 1340 } 1341 if (sep->se_family == AF_UNIX) { 1342 /* Ick - fch{own,mod} don't work on Unix domain sockets */ 1343 if (chown(sep->se_service, sep->se_sockuid, sep->se_sockgid) < 0) 1344 syslog(LOG_ERR, "chown socket: %m"); 1345 if (chmod(sep->se_service, sep->se_sockmode) < 0) 1346 syslog(LOG_ERR, "chmod socket: %m"); 1347 umask(mask); 1348 } 1349 if (sep->se_rpc) { 1350 u_int i; 1351 socklen_t len = sep->se_ctrladdr_size; 1352 struct netconfig *netid, *netid2 = NULL; 1353 struct sockaddr_in sock; 1354 struct netbuf nbuf, nbuf2; 1355 1356 if (getsockname(sep->se_fd, 1357 (struct sockaddr*)&sep->se_ctrladdr, &len) < 0){ 1358 syslog(LOG_ERR, "%s/%s: getsockname: %m", 1359 sep->se_service, sep->se_proto); 1360 (void) close(sep->se_fd); 1361 sep->se_fd = -1; 1362 return; 1363 } 1364 nbuf.buf = &sep->se_ctrladdr; 1365 nbuf.len = sep->se_ctrladdr.sa_len; 1366 if (sep->se_family == AF_INET) 1367 netid = sep->se_socktype==SOCK_DGRAM? udpconf:tcpconf; 1368 else { 1369 netid = sep->se_socktype==SOCK_DGRAM? udp6conf:tcp6conf; 1370 if (!sep->se_nomapped) { /* INET and INET6 */ 1371 netid2 = netid==udp6conf? udpconf:tcpconf; 1372 memset(&sock, 0, sizeof sock); /* ADDR_ANY */ 1373 nbuf2.buf = &sock; 1374 nbuf2.len = sock.sin_len = sizeof sock; 1375 sock.sin_family = AF_INET; 1376 sock.sin_port = sep->se_ctrladdr6.sin6_port; 1377 } 1378 } 1379 if (debug) 1380 print_service("REG ", sep); 1381 for (i = sep->se_rpc_lowvers; i <= sep->se_rpc_highvers; i++) { 1382 rpcb_unset(sep->se_rpc_prog, i, netid); 1383 rpcb_set(sep->se_rpc_prog, i, netid, &nbuf); 1384 if (netid2) { 1385 rpcb_unset(sep->se_rpc_prog, i, netid2); 1386 rpcb_set(sep->se_rpc_prog, i, netid2, &nbuf2); 1387 } 1388 } 1389 } 1390 if (sep->se_socktype == SOCK_STREAM) 1391 listen(sep->se_fd, 64); 1392 enable(sep); 1393 if (debug) { 1394 warnx("registered %s on %d", 1395 sep->se_server, sep->se_fd); 1396 } 1397 } 1398 1399 #ifdef IPSEC 1400 void 1401 ipsecsetup(sep) 1402 struct servtab *sep; 1403 { 1404 char *buf; 1405 char *policy_in = NULL; 1406 char *policy_out = NULL; 1407 int level; 1408 int opt; 1409 1410 switch (sep->se_family) { 1411 case AF_INET: 1412 level = IPPROTO_IP; 1413 opt = IP_IPSEC_POLICY; 1414 break; 1415 #ifdef INET6 1416 case AF_INET6: 1417 level = IPPROTO_IPV6; 1418 opt = IPV6_IPSEC_POLICY; 1419 break; 1420 #endif 1421 default: 1422 return; 1423 } 1424 1425 if (!sep->se_policy || sep->se_policy[0] == '\0') { 1426 static char def_in[] = "in entrust", def_out[] = "out entrust"; 1427 policy_in = def_in; 1428 policy_out = def_out; 1429 } else { 1430 if (!strncmp("in", sep->se_policy, 2)) 1431 policy_in = sep->se_policy; 1432 else if (!strncmp("out", sep->se_policy, 3)) 1433 policy_out = sep->se_policy; 1434 else { 1435 syslog(LOG_ERR, "invalid security policy \"%s\"", 1436 sep->se_policy); 1437 return; 1438 } 1439 } 1440 1441 if (policy_in != NULL) { 1442 buf = ipsec_set_policy(policy_in, strlen(policy_in)); 1443 if (buf != NULL) { 1444 if (setsockopt(sep->se_fd, level, opt, 1445 buf, ipsec_get_policylen(buf)) < 0 && 1446 debug != 0) 1447 warnx("%s/%s: ipsec initialization failed; %s", 1448 sep->se_service, sep->se_proto, 1449 policy_in); 1450 free(buf); 1451 } else 1452 syslog(LOG_ERR, "invalid security policy \"%s\"", 1453 policy_in); 1454 } 1455 if (policy_out != NULL) { 1456 buf = ipsec_set_policy(policy_out, strlen(policy_out)); 1457 if (buf != NULL) { 1458 if (setsockopt(sep->se_fd, level, opt, 1459 buf, ipsec_get_policylen(buf)) < 0 && 1460 debug != 0) 1461 warnx("%s/%s: ipsec initialization failed; %s", 1462 sep->se_service, sep->se_proto, 1463 policy_out); 1464 free(buf); 1465 } else 1466 syslog(LOG_ERR, "invalid security policy \"%s\"", 1467 policy_out); 1468 } 1469 } 1470 #endif 1471 1472 /* 1473 * Finish with a service and its socket. 1474 */ 1475 void 1476 close_sep(struct servtab *sep) 1477 { 1478 if (sep->se_fd >= 0) { 1479 if (FD_ISSET(sep->se_fd, &allsock)) 1480 disable(sep); 1481 (void) close(sep->se_fd); 1482 sep->se_fd = -1; 1483 } 1484 sep->se_count = 0; 1485 sep->se_numchild = 0; /* forget about any existing children */ 1486 } 1487 1488 int 1489 matchservent(const char *name1, const char *name2, const char *proto) 1490 { 1491 char **alias, *p; 1492 struct servent *se; 1493 1494 if (strcmp(proto, "unix") == 0) { 1495 if ((p = strrchr(name1, '/')) != NULL) 1496 name1 = p + 1; 1497 if ((p = strrchr(name2, '/')) != NULL) 1498 name2 = p + 1; 1499 } 1500 if (strcmp(name1, name2) == 0) 1501 return(1); 1502 if ((se = getservbyname(name1, proto)) != NULL) { 1503 if (strcmp(name2, se->s_name) == 0) 1504 return(1); 1505 for (alias = se->s_aliases; *alias; alias++) 1506 if (strcmp(name2, *alias) == 0) 1507 return(1); 1508 } 1509 return(0); 1510 } 1511 1512 struct servtab * 1513 enter(struct servtab *cp) 1514 { 1515 struct servtab *sep; 1516 long omask; 1517 1518 sep = (struct servtab *)malloc(sizeof (*sep)); 1519 if (sep == (struct servtab *)0) { 1520 syslog(LOG_ERR, "malloc: %m"); 1521 exit(EX_OSERR); 1522 } 1523 *sep = *cp; 1524 sep->se_fd = -1; 1525 omask = sigblock(SIGBLOCK); 1526 sep->se_next = servtab; 1527 servtab = sep; 1528 sigsetmask(omask); 1529 return (sep); 1530 } 1531 1532 void 1533 enable(struct servtab *sep) 1534 { 1535 if (debug) 1536 warnx( 1537 "enabling %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 off", __func__, sep->se_service); 1552 exit(EX_SOFTWARE); 1553 } 1554 nsock++; 1555 #endif 1556 FD_SET(sep->se_fd, &allsock); 1557 if (sep->se_fd > maxsock) 1558 maxsock = sep->se_fd; 1559 } 1560 1561 void 1562 disable(struct servtab *sep) 1563 { 1564 if (debug) 1565 warnx( 1566 "disabling %s, fd %d", sep->se_service, sep->se_fd); 1567 #ifdef SANITY_CHECK 1568 if (sep->se_fd < 0) { 1569 syslog(LOG_ERR, 1570 "%s: %s: bad fd", __func__, sep->se_service); 1571 exit(EX_SOFTWARE); 1572 } 1573 if (ISMUX(sep)) { 1574 syslog(LOG_ERR, 1575 "%s: %s: is mux", __func__, sep->se_service); 1576 exit(EX_SOFTWARE); 1577 } 1578 if (!FD_ISSET(sep->se_fd, &allsock)) { 1579 syslog(LOG_ERR, 1580 "%s: %s: not on", __func__, sep->se_service); 1581 exit(EX_SOFTWARE); 1582 } 1583 if (nsock == 0) { 1584 syslog(LOG_ERR, "%s: nsock=0", __func__); 1585 exit(EX_SOFTWARE); 1586 } 1587 nsock--; 1588 #endif 1589 FD_CLR(sep->se_fd, &allsock); 1590 if (sep->se_fd == maxsock) 1591 maxsock--; 1592 } 1593 1594 FILE *fconfig = NULL; 1595 struct servtab serv; 1596 char line[LINE_MAX]; 1597 1598 int 1599 setconfig(void) 1600 { 1601 1602 if (fconfig != NULL) { 1603 fseek(fconfig, 0L, SEEK_SET); 1604 return (1); 1605 } 1606 fconfig = fopen(CONFIG, "r"); 1607 return (fconfig != NULL); 1608 } 1609 1610 void 1611 endconfig(void) 1612 { 1613 if (fconfig) { 1614 (void) fclose(fconfig); 1615 fconfig = NULL; 1616 } 1617 } 1618 1619 struct servtab * 1620 getconfigent(void) 1621 { 1622 struct servtab *sep = &serv; 1623 int argc; 1624 char *cp, *arg, *s; 1625 char *versp; 1626 static char TCPMUX_TOKEN[] = "tcpmux/"; 1627 #define MUX_LEN (sizeof(TCPMUX_TOKEN)-1) 1628 #ifdef IPSEC 1629 char *policy; 1630 #endif 1631 int v4bind; 1632 #ifdef INET6 1633 int v6bind; 1634 #endif 1635 int i; 1636 1637 #ifdef IPSEC 1638 policy = NULL; 1639 #endif 1640 more: 1641 v4bind = 0; 1642 #ifdef INET6 1643 v6bind = 0; 1644 #endif 1645 while ((cp = nextline(fconfig)) != NULL) { 1646 #ifdef IPSEC 1647 /* lines starting with #@ is not a comment, but the policy */ 1648 if (cp[0] == '#' && cp[1] == '@') { 1649 char *p; 1650 for (p = cp + 2; p && *p && isspace(*p); p++) 1651 ; 1652 if (*p == '\0') { 1653 if (policy) 1654 free(policy); 1655 policy = NULL; 1656 } else if (ipsec_get_policylen(p) >= 0) { 1657 if (policy) 1658 free(policy); 1659 policy = newstr(p); 1660 } else { 1661 syslog(LOG_ERR, 1662 "%s: invalid ipsec policy \"%s\"", 1663 CONFIG, p); 1664 exit(EX_CONFIG); 1665 } 1666 } 1667 #endif 1668 if (*cp == '#' || *cp == '\0') 1669 continue; 1670 break; 1671 } 1672 if (cp == NULL) 1673 return ((struct servtab *)0); 1674 /* 1675 * clear the static buffer, since some fields (se_ctrladdr, 1676 * for example) don't get initialized here. 1677 */ 1678 memset(sep, 0, sizeof *sep); 1679 arg = skip(&cp); 1680 if (cp == NULL) { 1681 /* got an empty line containing just blanks/tabs. */ 1682 goto more; 1683 } 1684 if (arg[0] == ':') { /* :user:group:perm: */ 1685 char *user, *group, *perm; 1686 struct passwd *pw; 1687 struct group *gr; 1688 user = arg+1; 1689 if ((group = strchr(user, ':')) == NULL) { 1690 syslog(LOG_ERR, "no group after user '%s'", user); 1691 goto more; 1692 } 1693 *group++ = '\0'; 1694 if ((perm = strchr(group, ':')) == NULL) { 1695 syslog(LOG_ERR, "no mode after group '%s'", group); 1696 goto more; 1697 } 1698 *perm++ = '\0'; 1699 if ((pw = getpwnam(user)) == NULL) { 1700 syslog(LOG_ERR, "no such user '%s'", user); 1701 goto more; 1702 } 1703 sep->se_sockuid = pw->pw_uid; 1704 if ((gr = getgrnam(group)) == NULL) { 1705 syslog(LOG_ERR, "no such user '%s'", group); 1706 goto more; 1707 } 1708 sep->se_sockgid = gr->gr_gid; 1709 sep->se_sockmode = strtol(perm, &arg, 8); 1710 if (*arg != ':') { 1711 syslog(LOG_ERR, "bad mode '%s'", perm); 1712 goto more; 1713 } 1714 *arg++ = '\0'; 1715 } else { 1716 sep->se_sockuid = euid; 1717 sep->se_sockgid = egid; 1718 sep->se_sockmode = 0200; 1719 } 1720 if (strncmp(arg, TCPMUX_TOKEN, MUX_LEN) == 0) { 1721 char *c = arg + MUX_LEN; 1722 if (*c == '+') { 1723 sep->se_type = MUXPLUS_TYPE; 1724 c++; 1725 } else 1726 sep->se_type = MUX_TYPE; 1727 sep->se_service = newstr(c); 1728 } else { 1729 sep->se_service = newstr(arg); 1730 sep->se_type = NORM_TYPE; 1731 } 1732 arg = sskip(&cp); 1733 if (strcmp(arg, "stream") == 0) 1734 sep->se_socktype = SOCK_STREAM; 1735 else if (strcmp(arg, "dgram") == 0) 1736 sep->se_socktype = SOCK_DGRAM; 1737 else if (strcmp(arg, "rdm") == 0) 1738 sep->se_socktype = SOCK_RDM; 1739 else if (strcmp(arg, "seqpacket") == 0) 1740 sep->se_socktype = SOCK_SEQPACKET; 1741 else if (strcmp(arg, "raw") == 0) 1742 sep->se_socktype = SOCK_RAW; 1743 else 1744 sep->se_socktype = -1; 1745 1746 arg = sskip(&cp); 1747 if (strncmp(arg, "tcp", 3) == 0) { 1748 sep->se_proto = newstr(strsep(&arg, "/")); 1749 if (arg != NULL) { 1750 if (strcmp(arg, "ttcp") == 0) 1751 sep->se_type = TTCP_TYPE; 1752 else if (strcmp(arg, "faith") == 0) 1753 sep->se_type = FAITH_TYPE; 1754 } 1755 } else { 1756 if (sep->se_type == NORM_TYPE && 1757 strncmp(arg, "faith/", 6) == 0) { 1758 arg += 6; 1759 sep->se_type = FAITH_TYPE; 1760 } 1761 sep->se_proto = newstr(arg); 1762 } 1763 if (strncmp(sep->se_proto, "rpc/", 4) == 0) { 1764 memmove(sep->se_proto, sep->se_proto + 4, 1765 strlen(sep->se_proto) + 1 - 4); 1766 sep->se_rpc = 1; 1767 sep->se_rpc_prog = sep->se_rpc_lowvers = 1768 sep->se_rpc_lowvers = 0; 1769 memcpy(&sep->se_ctrladdr4, bind_sa4, 1770 sizeof(sep->se_ctrladdr4)); 1771 if ((versp = rindex(sep->se_service, '/'))) { 1772 *versp++ = '\0'; 1773 switch (sscanf(versp, "%u-%u", 1774 &sep->se_rpc_lowvers, 1775 &sep->se_rpc_highvers)) { 1776 case 2: 1777 break; 1778 case 1: 1779 sep->se_rpc_highvers = 1780 sep->se_rpc_lowvers; 1781 break; 1782 default: 1783 syslog(LOG_ERR, 1784 "bad RPC version specifier; %s", 1785 sep->se_service); 1786 freeconfig(sep); 1787 goto more; 1788 } 1789 } 1790 else { 1791 sep->se_rpc_lowvers = 1792 sep->se_rpc_highvers = 1; 1793 } 1794 } 1795 sep->se_nomapped = 0; 1796 if (strcmp(sep->se_proto, "unix") == 0) { 1797 sep->se_family = AF_UNIX; 1798 } else { 1799 while (isdigit(sep->se_proto[strlen(sep->se_proto) - 1])) { 1800 #ifdef INET6 1801 if (sep->se_proto[strlen(sep->se_proto) - 1] == '6') { 1802 sep->se_proto[strlen(sep->se_proto) - 1] = '\0'; 1803 v6bind = 1; 1804 continue; 1805 } 1806 #endif 1807 if (sep->se_proto[strlen(sep->se_proto) - 1] == '4') { 1808 sep->se_proto[strlen(sep->se_proto) - 1] = '\0'; 1809 v4bind = 1; 1810 continue; 1811 } 1812 /* illegal version num */ 1813 syslog(LOG_ERR, "bad IP version for %s", sep->se_proto); 1814 freeconfig(sep); 1815 goto more; 1816 } 1817 #ifdef INET6 1818 if (v6bind && !v6bind_ok) { 1819 syslog(LOG_INFO, "IPv6 bind is ignored for %s", 1820 sep->se_service); 1821 if (v4bind && v4bind_ok) 1822 v6bind = 0; 1823 else { 1824 freeconfig(sep); 1825 goto more; 1826 } 1827 } 1828 if (v6bind) { 1829 sep->se_family = AF_INET6; 1830 if (!v4bind || !v4bind_ok) 1831 sep->se_nomapped = 1; 1832 } else 1833 #endif 1834 { /* default to v4 bind if not v6 bind */ 1835 if (!v4bind_ok) { 1836 syslog(LOG_NOTICE, "IPv4 bind is ignored for %s", 1837 sep->se_service); 1838 freeconfig(sep); 1839 goto more; 1840 } 1841 sep->se_family = AF_INET; 1842 } 1843 } 1844 /* init ctladdr */ 1845 switch(sep->se_family) { 1846 case AF_INET: 1847 memcpy(&sep->se_ctrladdr4, bind_sa4, 1848 sizeof(sep->se_ctrladdr4)); 1849 sep->se_ctrladdr_size = sizeof(sep->se_ctrladdr4); 1850 break; 1851 #ifdef INET6 1852 case AF_INET6: 1853 memcpy(&sep->se_ctrladdr6, bind_sa6, 1854 sizeof(sep->se_ctrladdr6)); 1855 sep->se_ctrladdr_size = sizeof(sep->se_ctrladdr6); 1856 break; 1857 #endif 1858 case AF_UNIX: 1859 if (strlen(sep->se_service) >= sizeof(sep->se_ctrladdr_un.sun_path)) { 1860 syslog(LOG_ERR, 1861 "domain socket pathname too long for service %s", 1862 sep->se_service); 1863 goto more; 1864 } 1865 memset(&sep->se_ctrladdr, 0, sizeof(sep->se_ctrladdr)); 1866 sep->se_ctrladdr_un.sun_family = sep->se_family; 1867 sep->se_ctrladdr_un.sun_len = strlen(sep->se_service); 1868 strcpy(sep->se_ctrladdr_un.sun_path, sep->se_service); 1869 sep->se_ctrladdr_size = SUN_LEN(&sep->se_ctrladdr_un); 1870 } 1871 arg = sskip(&cp); 1872 if (!strncmp(arg, "wait", 4)) 1873 sep->se_accept = 0; 1874 else if (!strncmp(arg, "nowait", 6)) 1875 sep->se_accept = 1; 1876 else { 1877 syslog(LOG_ERR, 1878 "%s: bad wait/nowait for service %s", 1879 CONFIG, sep->se_service); 1880 goto more; 1881 } 1882 sep->se_maxchild = -1; 1883 sep->se_maxcpm = -1; 1884 sep->se_maxperip = -1; 1885 if ((s = strchr(arg, '/')) != NULL) { 1886 char *eptr; 1887 u_long val; 1888 1889 val = strtoul(s + 1, &eptr, 10); 1890 if (eptr == s + 1 || val > MAX_MAXCHLD) { 1891 syslog(LOG_ERR, 1892 "%s: bad max-child for service %s", 1893 CONFIG, sep->se_service); 1894 goto more; 1895 } 1896 if (debug) 1897 if (!sep->se_accept && val != 1) 1898 warnx("maxchild=%lu for wait service %s" 1899 " not recommended", val, sep->se_service); 1900 sep->se_maxchild = val; 1901 if (*eptr == '/') 1902 sep->se_maxcpm = strtol(eptr + 1, &eptr, 10); 1903 if (*eptr == '/') 1904 sep->se_maxperip = strtol(eptr + 1, &eptr, 10); 1905 /* 1906 * explicitly do not check for \0 for future expansion / 1907 * backwards compatibility 1908 */ 1909 } 1910 if (ISMUX(sep)) { 1911 /* 1912 * Silently enforce "nowait" mode for TCPMUX services 1913 * since they don't have an assigned port to listen on. 1914 */ 1915 sep->se_accept = 1; 1916 if (strcmp(sep->se_proto, "tcp")) { 1917 syslog(LOG_ERR, 1918 "%s: bad protocol for tcpmux service %s", 1919 CONFIG, sep->se_service); 1920 goto more; 1921 } 1922 if (sep->se_socktype != SOCK_STREAM) { 1923 syslog(LOG_ERR, 1924 "%s: bad socket type for tcpmux service %s", 1925 CONFIG, sep->se_service); 1926 goto more; 1927 } 1928 } 1929 sep->se_user = newstr(sskip(&cp)); 1930 #ifdef LOGIN_CAP 1931 if ((s = strrchr(sep->se_user, '/')) != NULL) { 1932 *s = '\0'; 1933 sep->se_class = newstr(s + 1); 1934 } else 1935 sep->se_class = newstr(RESOURCE_RC); 1936 #endif 1937 if ((s = strrchr(sep->se_user, ':')) != NULL) { 1938 *s = '\0'; 1939 sep->se_group = newstr(s + 1); 1940 } else 1941 sep->se_group = NULL; 1942 sep->se_server = newstr(sskip(&cp)); 1943 if ((sep->se_server_name = rindex(sep->se_server, '/'))) 1944 sep->se_server_name++; 1945 if (strcmp(sep->se_server, "internal") == 0) { 1946 struct biltin *bi; 1947 1948 for (bi = biltins; bi->bi_service; bi++) 1949 if (bi->bi_socktype == sep->se_socktype && 1950 matchservent(bi->bi_service, sep->se_service, 1951 sep->se_proto)) 1952 break; 1953 if (bi->bi_service == 0) { 1954 syslog(LOG_ERR, "internal service %s unknown", 1955 sep->se_service); 1956 goto more; 1957 } 1958 sep->se_accept = 1; /* force accept mode for built-ins */ 1959 sep->se_bi = bi; 1960 } else 1961 sep->se_bi = NULL; 1962 if (sep->se_maxperip < 0) 1963 sep->se_maxperip = maxperip; 1964 if (sep->se_maxcpm < 0) 1965 sep->se_maxcpm = maxcpm; 1966 if (sep->se_maxchild < 0) { /* apply default max-children */ 1967 if (sep->se_bi && sep->se_bi->bi_maxchild >= 0) 1968 sep->se_maxchild = sep->se_bi->bi_maxchild; 1969 else if (sep->se_accept) 1970 sep->se_maxchild = maxchild > 0 ? maxchild : 0; 1971 else 1972 sep->se_maxchild = 1; 1973 } 1974 if (sep->se_maxchild > 0) { 1975 sep->se_pids = malloc(sep->se_maxchild * sizeof(*sep->se_pids)); 1976 if (sep->se_pids == NULL) { 1977 syslog(LOG_ERR, "malloc: %m"); 1978 exit(EX_OSERR); 1979 } 1980 } 1981 argc = 0; 1982 for (arg = skip(&cp); cp; arg = skip(&cp)) 1983 if (argc < MAXARGV) { 1984 sep->se_argv[argc++] = newstr(arg); 1985 } else { 1986 syslog(LOG_ERR, 1987 "%s: too many arguments for service %s", 1988 CONFIG, sep->se_service); 1989 goto more; 1990 } 1991 while (argc <= MAXARGV) 1992 sep->se_argv[argc++] = NULL; 1993 for (i = 0; i < PERIPSIZE; ++i) 1994 LIST_INIT(&sep->se_conn[i]); 1995 #ifdef IPSEC 1996 sep->se_policy = policy ? newstr(policy) : NULL; 1997 #endif 1998 return (sep); 1999 } 2000 2001 void 2002 freeconfig(struct servtab *cp) 2003 { 2004 int i; 2005 2006 if (cp->se_service) 2007 free(cp->se_service); 2008 if (cp->se_proto) 2009 free(cp->se_proto); 2010 if (cp->se_user) 2011 free(cp->se_user); 2012 if (cp->se_group) 2013 free(cp->se_group); 2014 #ifdef LOGIN_CAP 2015 if (cp->se_class) 2016 free(cp->se_class); 2017 #endif 2018 if (cp->se_server) 2019 free(cp->se_server); 2020 if (cp->se_pids) 2021 free(cp->se_pids); 2022 for (i = 0; i < MAXARGV; i++) 2023 if (cp->se_argv[i]) 2024 free(cp->se_argv[i]); 2025 free_connlist(cp); 2026 #ifdef IPSEC 2027 if (cp->se_policy) 2028 free(cp->se_policy); 2029 #endif 2030 } 2031 2032 2033 /* 2034 * Safe skip - if skip returns null, log a syntax error in the 2035 * configuration file and exit. 2036 */ 2037 char * 2038 sskip(char **cpp) 2039 { 2040 char *cp; 2041 2042 cp = skip(cpp); 2043 if (cp == NULL) { 2044 syslog(LOG_ERR, "%s: syntax error", CONFIG); 2045 exit(EX_DATAERR); 2046 } 2047 return (cp); 2048 } 2049 2050 char * 2051 skip(char **cpp) 2052 { 2053 char *cp = *cpp; 2054 char *start; 2055 char quote = '\0'; 2056 2057 again: 2058 while (*cp == ' ' || *cp == '\t') 2059 cp++; 2060 if (*cp == '\0') { 2061 int c; 2062 2063 c = getc(fconfig); 2064 (void) ungetc(c, fconfig); 2065 if (c == ' ' || c == '\t') 2066 if ((cp = nextline(fconfig))) 2067 goto again; 2068 *cpp = (char *)0; 2069 return ((char *)0); 2070 } 2071 if (*cp == '"' || *cp == '\'') 2072 quote = *cp++; 2073 start = cp; 2074 if (quote) 2075 while (*cp && *cp != quote) 2076 cp++; 2077 else 2078 while (*cp && *cp != ' ' && *cp != '\t') 2079 cp++; 2080 if (*cp != '\0') 2081 *cp++ = '\0'; 2082 *cpp = cp; 2083 return (start); 2084 } 2085 2086 char * 2087 nextline(FILE *fd) 2088 { 2089 char *cp; 2090 2091 if (fgets(line, sizeof (line), fd) == NULL) 2092 return ((char *)0); 2093 cp = strchr(line, '\n'); 2094 if (cp) 2095 *cp = '\0'; 2096 return (line); 2097 } 2098 2099 char * 2100 newstr(const char *cp) 2101 { 2102 char *cr; 2103 2104 if ((cr = strdup(cp != NULL ? cp : ""))) 2105 return (cr); 2106 syslog(LOG_ERR, "strdup: %m"); 2107 exit(EX_OSERR); 2108 } 2109 2110 void 2111 inetd_setproctitle(const char *a, int s) 2112 { 2113 socklen_t size; 2114 struct sockaddr_storage ss; 2115 char buf[80], pbuf[INET6_ADDRSTRLEN]; 2116 2117 size = sizeof(ss); 2118 if (getpeername(s, (struct sockaddr *)&ss, &size) == 0) { 2119 getnameinfo((struct sockaddr *)&ss, size, pbuf, sizeof(pbuf), 2120 NULL, 0, NI_NUMERICHOST|NI_WITHSCOPEID); 2121 (void) sprintf(buf, "%s [%s]", a, pbuf); 2122 } else 2123 (void) sprintf(buf, "%s", a); 2124 setproctitle("%s", buf); 2125 } 2126 2127 int 2128 check_loop(const struct sockaddr *sa, const struct servtab *sep) 2129 { 2130 struct servtab *se2; 2131 char pname[INET6_ADDRSTRLEN]; 2132 2133 for (se2 = servtab; se2; se2 = se2->se_next) { 2134 if (!se2->se_bi || se2->se_socktype != SOCK_DGRAM) 2135 continue; 2136 2137 switch (se2->se_family) { 2138 case AF_INET: 2139 if (((const struct sockaddr_in *)sa)->sin_port == 2140 se2->se_ctrladdr4.sin_port) 2141 goto isloop; 2142 continue; 2143 #ifdef INET6 2144 case AF_INET6: 2145 if (((const struct sockaddr_in *)sa)->sin_port == 2146 se2->se_ctrladdr4.sin_port) 2147 goto isloop; 2148 continue; 2149 #endif 2150 default: 2151 continue; 2152 } 2153 isloop: 2154 getnameinfo(sa, sa->sa_len, pname, sizeof(pname), NULL, 0, 2155 NI_NUMERICHOST|NI_WITHSCOPEID); 2156 syslog(LOG_WARNING, "%s/%s:%s/%s loop request REFUSED from %s", 2157 sep->se_service, sep->se_proto, 2158 se2->se_service, se2->se_proto, 2159 pname); 2160 return 1; 2161 } 2162 return 0; 2163 } 2164 2165 /* 2166 * print_service: 2167 * Dump relevant information to stderr 2168 */ 2169 void 2170 print_service(const char *action, const struct servtab *sep) 2171 { 2172 fprintf(stderr, 2173 "%s: %s proto=%s accept=%d max=%d user=%s group=%s" 2174 #ifdef LOGIN_CAP 2175 "class=%s" 2176 #endif 2177 " builtin=%p server=%s" 2178 #ifdef IPSEC 2179 " policy=\"%s\"" 2180 #endif 2181 "\n", 2182 action, sep->se_service, sep->se_proto, 2183 sep->se_accept, sep->se_maxchild, sep->se_user, sep->se_group, 2184 #ifdef LOGIN_CAP 2185 sep->se_class, 2186 #endif 2187 (void *) sep->se_bi, sep->se_server 2188 #ifdef IPSEC 2189 , (sep->se_policy ? sep->se_policy : "") 2190 #endif 2191 ); 2192 } 2193 2194 #define CPMHSIZE 256 2195 #define CPMHMASK (CPMHSIZE-1) 2196 #define CHTGRAN 10 2197 #define CHTSIZE 6 2198 2199 typedef struct CTime { 2200 unsigned long ct_Ticks; 2201 int ct_Count; 2202 } CTime; 2203 2204 typedef struct CHash { 2205 union { 2206 struct in_addr c4_Addr; 2207 struct in6_addr c6_Addr; 2208 } cu_Addr; 2209 #define ch_Addr4 cu_Addr.c4_Addr 2210 #define ch_Addr6 cu_Addr.c6_Addr 2211 int ch_Family; 2212 time_t ch_LTime; 2213 char *ch_Service; 2214 CTime ch_Times[CHTSIZE]; 2215 } CHash; 2216 2217 CHash CHashAry[CPMHSIZE]; 2218 2219 int 2220 cpmip(const struct servtab *sep, int ctrl) 2221 { 2222 struct sockaddr_storage rss; 2223 socklen_t rssLen = sizeof(rss); 2224 int r = 0; 2225 2226 /* 2227 * If getpeername() fails, just let it through (if logging is 2228 * enabled the condition is caught elsewhere) 2229 */ 2230 2231 if (sep->se_maxcpm > 0 && 2232 getpeername(ctrl, (struct sockaddr *)&rss, &rssLen) == 0 ) { 2233 time_t t = time(NULL); 2234 int hv = 0xABC3D20F; 2235 int i; 2236 int cnt = 0; 2237 CHash *chBest = NULL; 2238 unsigned int ticks = t / CHTGRAN; 2239 struct sockaddr_in *sin4; 2240 #ifdef INET6 2241 struct sockaddr_in6 *sin6; 2242 #endif 2243 2244 sin4 = (struct sockaddr_in *)&rss; 2245 #ifdef INET6 2246 sin6 = (struct sockaddr_in6 *)&rss; 2247 #endif 2248 { 2249 char *p; 2250 int addrlen; 2251 2252 switch (rss.ss_family) { 2253 case AF_INET: 2254 p = (char *)&sin4->sin_addr; 2255 addrlen = sizeof(struct in_addr); 2256 break; 2257 #ifdef INET6 2258 case AF_INET6: 2259 p = (char *)&sin6->sin6_addr; 2260 addrlen = sizeof(struct in6_addr); 2261 break; 2262 #endif 2263 default: 2264 /* should not happen */ 2265 return -1; 2266 } 2267 2268 for (i = 0; i < addrlen; ++i, ++p) { 2269 hv = (hv << 5) ^ (hv >> 23) ^ *p; 2270 } 2271 hv = (hv ^ (hv >> 16)); 2272 } 2273 for (i = 0; i < 5; ++i) { 2274 CHash *ch = &CHashAry[(hv + i) & CPMHMASK]; 2275 2276 if (rss.ss_family == AF_INET && 2277 ch->ch_Family == AF_INET && 2278 sin4->sin_addr.s_addr == ch->ch_Addr4.s_addr && 2279 ch->ch_Service && strcmp(sep->se_service, 2280 ch->ch_Service) == 0) { 2281 chBest = ch; 2282 break; 2283 } 2284 #ifdef INET6 2285 if (rss.ss_family == AF_INET6 && 2286 ch->ch_Family == AF_INET6 && 2287 IN6_ARE_ADDR_EQUAL(&sin6->sin6_addr, 2288 &ch->ch_Addr6) != 0 && 2289 ch->ch_Service && strcmp(sep->se_service, 2290 ch->ch_Service) == 0) { 2291 chBest = ch; 2292 break; 2293 } 2294 #endif 2295 if (chBest == NULL || ch->ch_LTime == 0 || 2296 ch->ch_LTime < chBest->ch_LTime) { 2297 chBest = ch; 2298 } 2299 } 2300 if ((rss.ss_family == AF_INET && 2301 (chBest->ch_Family != AF_INET || 2302 sin4->sin_addr.s_addr != chBest->ch_Addr4.s_addr)) || 2303 chBest->ch_Service == NULL || 2304 strcmp(sep->se_service, chBest->ch_Service) != 0) { 2305 chBest->ch_Family = sin4->sin_family; 2306 chBest->ch_Addr4 = sin4->sin_addr; 2307 if (chBest->ch_Service) 2308 free(chBest->ch_Service); 2309 chBest->ch_Service = strdup(sep->se_service); 2310 bzero(chBest->ch_Times, sizeof(chBest->ch_Times)); 2311 } 2312 #ifdef INET6 2313 if ((rss.ss_family == AF_INET6 && 2314 (chBest->ch_Family != AF_INET6 || 2315 IN6_ARE_ADDR_EQUAL(&sin6->sin6_addr, 2316 &chBest->ch_Addr6) == 0)) || 2317 chBest->ch_Service == NULL || 2318 strcmp(sep->se_service, chBest->ch_Service) != 0) { 2319 chBest->ch_Family = sin6->sin6_family; 2320 chBest->ch_Addr6 = sin6->sin6_addr; 2321 if (chBest->ch_Service) 2322 free(chBest->ch_Service); 2323 chBest->ch_Service = strdup(sep->se_service); 2324 bzero(chBest->ch_Times, sizeof(chBest->ch_Times)); 2325 } 2326 #endif 2327 chBest->ch_LTime = t; 2328 { 2329 CTime *ct = &chBest->ch_Times[ticks % CHTSIZE]; 2330 if (ct->ct_Ticks != ticks) { 2331 ct->ct_Ticks = ticks; 2332 ct->ct_Count = 0; 2333 } 2334 ++ct->ct_Count; 2335 } 2336 for (i = 0; i < CHTSIZE; ++i) { 2337 CTime *ct = &chBest->ch_Times[i]; 2338 if (ct->ct_Ticks <= ticks && 2339 ct->ct_Ticks >= ticks - CHTSIZE) { 2340 cnt += ct->ct_Count; 2341 } 2342 } 2343 if ((cnt * 60) / (CHTSIZE * CHTGRAN) > sep->se_maxcpm) { 2344 char pname[INET6_ADDRSTRLEN]; 2345 2346 getnameinfo((struct sockaddr *)&rss, 2347 ((struct sockaddr *)&rss)->sa_len, 2348 pname, sizeof(pname), NULL, 0, 2349 NI_NUMERICHOST|NI_WITHSCOPEID); 2350 r = -1; 2351 syslog(LOG_ERR, 2352 "%s from %s exceeded counts/min (limit %d/min)", 2353 sep->se_service, pname, 2354 sep->se_maxcpm); 2355 } 2356 } 2357 return(r); 2358 } 2359 2360 static struct conninfo * 2361 search_conn(struct servtab *sep, int ctrl) 2362 { 2363 struct sockaddr_storage ss; 2364 socklen_t sslen = sizeof(ss); 2365 struct conninfo *conn; 2366 int hv; 2367 char pname[NI_MAXHOST], pname2[NI_MAXHOST]; 2368 2369 if (sep->se_maxperip <= 0) 2370 return NULL; 2371 2372 /* 2373 * If getpeername() fails, just let it through (if logging is 2374 * enabled the condition is caught elsewhere) 2375 */ 2376 if (getpeername(ctrl, (struct sockaddr *)&ss, &sslen) != 0) 2377 return NULL; 2378 2379 switch (ss.ss_family) { 2380 case AF_INET: 2381 hv = hashval((char *)&((struct sockaddr_in *)&ss)->sin_addr, 2382 sizeof(struct in_addr)); 2383 break; 2384 #ifdef INET6 2385 case AF_INET6: 2386 hv = hashval((char *)&((struct sockaddr_in6 *)&ss)->sin6_addr, 2387 sizeof(struct in6_addr)); 2388 break; 2389 #endif 2390 default: 2391 /* 2392 * Since we only support AF_INET and AF_INET6, just 2393 * let other than AF_INET and AF_INET6 through. 2394 */ 2395 return NULL; 2396 } 2397 2398 if (getnameinfo((struct sockaddr *)&ss, sslen, pname, sizeof(pname), 2399 NULL, 0, NI_NUMERICHOST | NI_WITHSCOPEID) != 0) 2400 return NULL; 2401 2402 LIST_FOREACH(conn, &sep->se_conn[hv], co_link) { 2403 if (getnameinfo((struct sockaddr *)&conn->co_addr, 2404 conn->co_addr.ss_len, pname2, sizeof(pname2), NULL, 0, 2405 NI_NUMERICHOST | NI_WITHSCOPEID) == 0 && 2406 strcmp(pname, pname2) == 0) 2407 break; 2408 } 2409 2410 if (conn == NULL) { 2411 if ((conn = malloc(sizeof(struct conninfo))) == NULL) { 2412 syslog(LOG_ERR, "malloc: %m"); 2413 exit(EX_OSERR); 2414 } 2415 conn->co_proc = malloc(sep->se_maxperip * sizeof(*conn->co_proc)); 2416 if (conn->co_proc == NULL) { 2417 syslog(LOG_ERR, "malloc: %m"); 2418 exit(EX_OSERR); 2419 } 2420 memcpy(&conn->co_addr, (struct sockaddr *)&ss, sslen); 2421 conn->co_numchild = 0; 2422 LIST_INSERT_HEAD(&sep->se_conn[hv], conn, co_link); 2423 } 2424 2425 /* 2426 * Since a child process is not invoked yet, we cannot 2427 * determine a pid of a child. So, co_proc and co_numchild 2428 * should be filled leter. 2429 */ 2430 2431 return conn; 2432 } 2433 2434 static int 2435 room_conn(struct servtab *sep, struct conninfo *conn) 2436 { 2437 char pname[NI_MAXHOST]; 2438 2439 if (conn->co_numchild >= sep->se_maxperip) { 2440 getnameinfo((struct sockaddr *)&conn->co_addr, 2441 conn->co_addr.ss_len, pname, sizeof(pname), NULL, 0, 2442 NI_NUMERICHOST | NI_WITHSCOPEID); 2443 syslog(LOG_ERR, "%s from %s exceeded counts (limit %d)", 2444 sep->se_service, pname, sep->se_maxperip); 2445 return 0; 2446 } 2447 return 1; 2448 } 2449 2450 static void 2451 addchild_conn(struct conninfo *conn, pid_t pid) 2452 { 2453 struct procinfo *proc; 2454 2455 if (conn == NULL) 2456 return; 2457 2458 if ((proc = search_proc(pid, 1)) != NULL) { 2459 if (proc->pr_conn != NULL) { 2460 syslog(LOG_ERR, 2461 "addchild_conn: child already on process list"); 2462 exit(EX_OSERR); 2463 } 2464 proc->pr_conn = conn; 2465 } 2466 2467 conn->co_proc[conn->co_numchild++] = proc; 2468 } 2469 2470 static void 2471 reapchild_conn(pid_t pid) 2472 { 2473 struct procinfo *proc; 2474 struct conninfo *conn; 2475 int i; 2476 2477 if ((proc = search_proc(pid, 0)) == NULL) 2478 return; 2479 if ((conn = proc->pr_conn) == NULL) 2480 return; 2481 for (i = 0; i < conn->co_numchild; ++i) 2482 if (conn->co_proc[i] == proc) { 2483 conn->co_proc[i] = conn->co_proc[--conn->co_numchild]; 2484 break; 2485 } 2486 free_proc(proc); 2487 free_conn(conn); 2488 } 2489 2490 static void 2491 resize_conn(struct servtab *sep, int maxpip) 2492 { 2493 struct conninfo *conn; 2494 int i, j; 2495 2496 if (sep->se_maxperip <= 0) 2497 return; 2498 if (maxpip <= 0) { 2499 free_connlist(sep); 2500 return; 2501 } 2502 for (i = 0; i < PERIPSIZE; ++i) { 2503 LIST_FOREACH(conn, &sep->se_conn[i], co_link) { 2504 for (j = maxpip; j < conn->co_numchild; ++j) 2505 free_proc(conn->co_proc[j]); 2506 conn->co_proc = realloc(conn->co_proc, 2507 maxpip * sizeof(*conn->co_proc)); 2508 if (conn->co_proc == NULL) { 2509 syslog(LOG_ERR, "realloc: %m"); 2510 exit(EX_OSERR); 2511 } 2512 if (conn->co_numchild > maxpip) 2513 conn->co_numchild = maxpip; 2514 } 2515 } 2516 } 2517 2518 static void 2519 free_connlist(struct servtab *sep) 2520 { 2521 struct conninfo *conn; 2522 int i, j; 2523 2524 for (i = 0; i < PERIPSIZE; ++i) { 2525 while ((conn = LIST_FIRST(&sep->se_conn[i])) != NULL) { 2526 for (j = 0; j < conn->co_numchild; ++j) 2527 free_proc(conn->co_proc[j]); 2528 conn->co_numchild = 0; 2529 free_conn(conn); 2530 } 2531 } 2532 } 2533 2534 static void 2535 free_conn(struct conninfo *conn) 2536 { 2537 if (conn == NULL) 2538 return; 2539 if (conn->co_numchild <= 0) { 2540 LIST_REMOVE(conn, co_link); 2541 free(conn->co_proc); 2542 free(conn); 2543 } 2544 } 2545 2546 static struct procinfo * 2547 search_proc(pid_t pid, int add) 2548 { 2549 struct procinfo *proc; 2550 int hv; 2551 2552 hv = hashval((char *)&pid, sizeof(pid)); 2553 LIST_FOREACH(proc, &proctable[hv], pr_link) { 2554 if (proc->pr_pid == pid) 2555 break; 2556 } 2557 if (proc == NULL && add) { 2558 if ((proc = malloc(sizeof(struct procinfo))) == NULL) { 2559 syslog(LOG_ERR, "malloc: %m"); 2560 exit(EX_OSERR); 2561 } 2562 proc->pr_pid = pid; 2563 proc->pr_conn = NULL; 2564 LIST_INSERT_HEAD(&proctable[hv], proc, pr_link); 2565 } 2566 return proc; 2567 } 2568 2569 static void 2570 free_proc(struct procinfo *proc) 2571 { 2572 if (proc == NULL) 2573 return; 2574 LIST_REMOVE(proc, pr_link); 2575 free(proc); 2576 } 2577 2578 static int 2579 hashval(char *p, int len) 2580 { 2581 int i, hv = 0xABC3D20F; 2582 2583 for (i = 0; i < len; ++i, ++p) 2584 hv = (hv << 5) ^ (hv >> 23) ^ *p; 2585 hv = (hv ^ (hv >> 16)) & (PERIPSIZE - 1); 2586 return hv; 2587 } 2588