inetd.c revision 1.66
1/* $NetBSD: inetd.c,v 1.66 2000/07/04 13:25:39 itojun Exp $ */ 2 3/*- 4 * Copyright (c) 1998 The NetBSD Foundation, Inc. 5 * All rights reserved. 6 * 7 * This code is derived from software contributed to The NetBSD Foundation 8 * by Jason R. Thorpe of the Numerical Aerospace Simulation Facility, 9 * NASA Ames Research Center. 10 * 11 * Redistribution and use in source and binary forms, with or without 12 * modification, are permitted provided that the following conditions 13 * are met: 14 * 1. Redistributions of source code must retain the above copyright 15 * notice, this list of conditions and the following disclaimer. 16 * 2. Redistributions in binary form must reproduce the above copyright 17 * notice, this list of conditions and the following disclaimer in the 18 * documentation and/or other materials provided with the distribution. 19 * 3. All advertising materials mentioning features or use of this software 20 * must display the following acknowledgement: 21 * This product includes software developed by the NetBSD 22 * Foundation, Inc. and its contributors. 23 * 4. Neither the name of The NetBSD Foundation nor the names of its 24 * contributors may be used to endorse or promote products derived 25 * from this software without specific prior written permission. 26 * 27 * THIS SOFTWARE IS PROVIDED BY THE NETBSD FOUNDATION, INC. AND CONTRIBUTORS 28 * ``AS IS'' AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED 29 * TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR 30 * PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE FOUNDATION OR CONTRIBUTORS 31 * BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR 32 * CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF 33 * SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS 34 * INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN 35 * CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) 36 * ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE 37 * POSSIBILITY OF SUCH DAMAGE. 38 */ 39 40/* 41 * Copyright (c) 1983, 1991, 1993, 1994 42 * The Regents of the University of California. All rights reserved. 43 * 44 * Redistribution and use in source and binary forms, with or without 45 * modification, are permitted provided that the following conditions 46 * are met: 47 * 1. Redistributions of source code must retain the above copyright 48 * notice, this list of conditions and the following disclaimer. 49 * 2. Redistributions in binary form must reproduce the above copyright 50 * notice, this list of conditions and the following disclaimer in the 51 * documentation and/or other materials provided with the distribution. 52 * 3. All advertising materials mentioning features or use of this software 53 * must display the following acknowledgement: 54 * This product includes software developed by the University of 55 * California, Berkeley and its contributors. 56 * 4. Neither the name of the University nor the names of its contributors 57 * may be used to endorse or promote products derived from this software 58 * without specific prior written permission. 59 * 60 * THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND 61 * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE 62 * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE 63 * ARE DISCLAIMED. IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE 64 * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL 65 * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS 66 * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) 67 * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT 68 * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY 69 * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF 70 * SUCH DAMAGE. 71 */ 72 73#include <sys/cdefs.h> 74#ifndef lint 75__COPYRIGHT("@(#) Copyright (c) 1983, 1991, 1993, 1994\n\ 76 The Regents of the University of California. All rights reserved.\n"); 77#if 0 78static char sccsid[] = "@(#)inetd.c 8.4 (Berkeley) 4/13/94"; 79#else 80__RCSID("$NetBSD: inetd.c,v 1.66 2000/07/04 13:25:39 itojun Exp $"); 81#endif 82#endif /* not lint */ 83 84/* 85 * Inetd - Internet super-server 86 * 87 * This program invokes all internet services as needed. Connection-oriented 88 * services are invoked each time a connection is made, by creating a process. 89 * This process is passed the connection as file descriptor 0 and is expected 90 * to do a getpeername to find out the source host and port. 91 * 92 * Datagram oriented services are invoked when a datagram 93 * arrives; a process is created and passed a pending message 94 * on file descriptor 0. Datagram servers may either connect 95 * to their peer, freeing up the original socket for inetd 96 * to receive further messages on, or ``take over the socket'', 97 * processing all arriving datagrams and, eventually, timing 98 * out. The first type of server is said to be ``multi-threaded''; 99 * the second type of server ``single-threaded''. 100 * 101 * Inetd uses a configuration file which is read at startup 102 * and, possibly, at some later time in response to a hangup signal. 103 * The configuration file is ``free format'' with fields given in the 104 * order shown below. Continuation lines for an entry must being with 105 * a space or tab. All fields must be present in each entry. 106 * 107 * service name must be in /etc/services or must 108 * name a tcpmux service 109 * socket type stream/dgram/raw/rdm/seqpacket 110 * protocol must be in /etc/protocols 111 * wait/nowait[:max] single-threaded/multi-threaded, max # 112 * user[:group] user/group to run daemon as 113 * server program full path name 114 * server program arguments maximum of MAXARGS (20) 115 * 116 * For RPC services 117 * service name/version must be in /etc/rpc 118 * socket type stream/dgram/raw/rdm/seqpacket 119 * protocol must be in /etc/protocols 120 * wait/nowait[:max] single-threaded/multi-threaded 121 * user[:group] user to run daemon as 122 * server program full path name 123 * server program arguments maximum of MAXARGS (20) 124 * 125 * For non-RPC services, the "service name" can be of the form 126 * hostaddress:servicename, in which case the hostaddress is used 127 * as the host portion of the address to listen on. If hostaddress 128 * consists of a single `*' character, INADDR_ANY is used. 129 * 130 * A line can also consist of just 131 * hostaddress: 132 * where hostaddress is as in the preceding paragraph. Such a line must 133 * have no further fields; the specified hostaddress is remembered and 134 * used for all further lines that have no hostaddress specified, 135 * until the next such line (or EOF). (This is why * is provided to 136 * allow explicit specification of INADDR_ANY.) A line 137 * *: 138 * is implicitly in effect at the beginning of the file. 139 * 140 * The hostaddress specifier may (and often will) contain dots; 141 * the service name must not. 142 * 143 * For RPC services, host-address specifiers are accepted and will 144 * work to some extent; however, because of limitations in the 145 * portmapper interface, it will not work to try to give more than 146 * one line for any given RPC service, even if the host-address 147 * specifiers are different. 148 * 149 * TCP services without official port numbers are handled with the 150 * RFC1078-based tcpmux internal service. Tcpmux listens on port 1 for 151 * requests. When a connection is made from a foreign host, the service 152 * requested is passed to tcpmux, which looks it up in the servtab list 153 * and returns the proper entry for the service. Tcpmux returns a 154 * negative reply if the service doesn't exist, otherwise the invoked 155 * server is expected to return the positive reply if the service type in 156 * inetd.conf file has the prefix "tcpmux/". If the service type has the 157 * prefix "tcpmux/+", tcpmux will return the positive reply for the 158 * process; this is for compatibility with older server code, and also 159 * allows you to invoke programs that use stdin/stdout without putting any 160 * special server code in them. Services that use tcpmux are "nowait" 161 * because they do not have a well-known port and hence cannot listen 162 * for new requests. 163 * 164 * Comment lines are indicated by a `#' in column 1. 165 * 166 * #ifdef IPSEC 167 * Comment lines that start with "#@" denote IPsec policy string, as described 168 * in ipsec_set_policy(3). This will affect all the following items in 169 * inetd.conf(8). To reset the policy, just use "#@" line. By default, 170 * there's no IPsec policy. 171 * #endif 172 */ 173 174/* 175 * Here's the scoop concerning the user:group feature: 176 * 177 * 1) set-group-option off. 178 * 179 * a) user = root: NO setuid() or setgid() is done 180 * 181 * b) other: setuid() 182 * setgid(primary group as found in passwd) 183 * initgroups(name, primary group) 184 * 185 * 2) set-group-option on. 186 * 187 * a) user = root: NO setuid() 188 * setgid(specified group) 189 * NO initgroups() 190 * 191 * b) other: setuid() 192 * setgid(specified group) 193 * initgroups(name, specified group) 194 * 195 */ 196 197#include <sys/param.h> 198#include <sys/stat.h> 199#include <sys/ioctl.h> 200#include <sys/socket.h> 201#include <sys/un.h> 202#include <sys/wait.h> 203#include <sys/time.h> 204#include <sys/resource.h> 205 206#ifndef RLIMIT_NOFILE 207#define RLIMIT_NOFILE RLIMIT_OFILE 208#endif 209 210#ifndef NO_RPC 211#define RPC 212#endif 213 214#include <netinet/in.h> 215#include <arpa/inet.h> 216#ifdef RPC 217#include <rpc/rpc.h> 218#include <rpc/rpcb_clnt.h> 219#include <netconfig.h> 220#endif 221 222#include <ctype.h> 223#include <errno.h> 224#include <fcntl.h> 225#include <grp.h> 226#include <netdb.h> 227#include <pwd.h> 228#include <signal.h> 229#include <stdio.h> 230#include <stdlib.h> 231#include <string.h> 232#include <syslog.h> 233#include <unistd.h> 234#include <util.h> 235 236#include "pathnames.h" 237 238#ifdef IPSEC 239#include <netinet6/ipsec.h> 240#ifndef IPSEC_POLICY_IPSEC /* no ipsec support on old ipsec */ 241#undef IPSEC 242#endif 243#include "ipsec.h" 244#endif 245 246#ifdef LIBWRAP 247# include <tcpd.h> 248#ifndef LIBWRAP_ALLOW_FACILITY 249# define LIBWRAP_ALLOW_FACILITY LOG_AUTH 250#endif 251#ifndef LIBWRAP_ALLOW_SEVERITY 252# define LIBWRAP_ALLOW_SEVERITY LOG_INFO 253#endif 254#ifndef LIBWRAP_DENY_FACILITY 255# define LIBWRAP_DENY_FACILITY LOG_AUTH 256#endif 257#ifndef LIBWRAP_DENY_SEVERITY 258# define LIBWRAP_DENY_SEVERITY LOG_WARNING 259#endif 260int allow_severity = LIBWRAP_ALLOW_FACILITY|LIBWRAP_ALLOW_SEVERITY; 261int deny_severity = LIBWRAP_DENY_FACILITY|LIBWRAP_DENY_SEVERITY; 262#endif 263 264#define TOOMANY 40 /* don't start more than TOOMANY */ 265#define CNT_INTVL 60 /* servers in CNT_INTVL sec. */ 266#define RETRYTIME (60*10) /* retry after bind or server fail */ 267 268#define SIGBLOCK (sigmask(SIGCHLD)|sigmask(SIGHUP)|sigmask(SIGALRM)) 269 270int debug; 271#ifdef LIBWRAP 272int lflag; 273#endif 274int nsock, maxsock; 275fd_set allsock; 276int options; 277int timingout; 278struct servent *sp; 279char *curdom; 280#ifdef NI_WITHSCOPEID 281const int niflags = NI_NUMERICHOST | NI_NUMERICSERV | NI_WITHSCOPEID; 282#else 283const int niflags = NI_NUMERICHOST | NI_NUMERICSERV; 284#endif 285 286#ifndef OPEN_MAX 287#define OPEN_MAX 64 288#endif 289 290/* Reserve some descriptors, 3 stdio + at least: 1 log, 1 conf. file */ 291#define FD_MARGIN (8) 292typeof(((struct rlimit *)0)->rlim_cur) rlim_ofile_cur = OPEN_MAX; 293 294#ifdef RLIMIT_NOFILE 295struct rlimit rlim_ofile; 296#endif 297 298struct servtab { 299 char *se_hostaddr; /* host address to listen on */ 300 char *se_service; /* name of service */ 301 int se_socktype; /* type of socket to use */ 302 int se_family; /* address family */ 303 char *se_proto; /* protocol used */ 304 int se_sndbuf; /* sndbuf size */ 305 int se_rcvbuf; /* rcvbuf size */ 306 int se_rpcprog; /* rpc program number */ 307 int se_rpcversl; /* rpc program lowest version */ 308 int se_rpcversh; /* rpc program highest version */ 309#define isrpcservice(sep) ((sep)->se_rpcversl != 0) 310 pid_t se_wait; /* single threaded server */ 311 short se_checked; /* looked at during merge */ 312 char *se_user; /* user name to run as */ 313 char *se_group; /* group name to run as */ 314 struct biltin *se_bi; /* if built-in, description */ 315 char *se_server; /* server program */ 316#define MAXARGV 20 317 char *se_argv[MAXARGV+1]; /* program arguments */ 318#ifdef IPSEC 319 char *se_policy; /* IPsec poilcy string */ 320#endif 321 int se_fd; /* open descriptor */ 322 int se_type; /* type */ 323 union { 324 struct sockaddr se_un_ctrladdr; 325 struct sockaddr_in se_un_ctrladdr_in; 326 struct sockaddr_in6 se_un_ctrladdr_in6; 327 struct sockaddr_un se_un_ctrladdr_un; 328 } se_un; /* bound address */ 329#define se_ctrladdr se_un.se_un_ctrladdr 330#define se_ctrladdr_in se_un.se_un_ctrladdr_in 331#define se_ctrladdr_un se_un.se_un_ctrladdr_un 332 int se_ctrladdr_size; 333 int se_max; /* max # of instances of this service */ 334 int se_count; /* number started since se_time */ 335 struct timeval se_time; /* start of se_count */ 336#ifdef MULOG 337 int se_log; 338#define MULOG_RFC931 0x40000000 339#endif 340 struct servtab *se_next; 341} *servtab; 342 343#define NORM_TYPE 0 344#define MUX_TYPE 1 345#define MUXPLUS_TYPE 2 346#define FAITH_TYPE 3 347#define ISMUX(sep) (((sep)->se_type == MUX_TYPE) || \ 348 ((sep)->se_type == MUXPLUS_TYPE)) 349#define ISMUXPLUS(sep) ((sep)->se_type == MUXPLUS_TYPE) 350 351 352void chargen_dg __P((int, struct servtab *)); 353void chargen_stream __P((int, struct servtab *)); 354void close_sep __P((struct servtab *)); 355void config __P((int)); 356void daytime_dg __P((int, struct servtab *)); 357void daytime_stream __P((int, struct servtab *)); 358void discard_dg __P((int, struct servtab *)); 359void discard_stream __P((int, struct servtab *)); 360void echo_dg __P((int, struct servtab *)); 361void echo_stream __P((int, struct servtab *)); 362void endconfig __P((void)); 363struct servtab *enter __P((struct servtab *)); 364void freeconfig __P((struct servtab *)); 365struct servtab *getconfigent __P((void)); 366void goaway __P((int)); 367void machtime_dg __P((int, struct servtab *)); 368void machtime_stream __P((int, struct servtab *)); 369char *newstr __P((char *)); 370char *nextline __P((FILE *)); 371void print_service __P((char *, struct servtab *)); 372void reapchild __P((int)); 373void retry __P((int)); 374void run_service __P((int, struct servtab *)); 375int setconfig __P((void)); 376void setup __P((struct servtab *)); 377char *sskip __P((char **)); 378char *skip __P((char **)); 379void tcpmux __P((int, struct servtab *)); 380void usage __P((void)); 381void register_rpc __P((struct servtab *sep)); 382void unregister_rpc __P((struct servtab *sep)); 383void bump_nofile __P((void)); 384void inetd_setproctitle __P((char *, int)); 385void initring __P((void)); 386long machtime __P((void)); 387int port_good_dg __P((struct sockaddr *sa)); 388static int getline __P((int, char *, int)); 389int main __P((int, char *[], char *[])); 390 391struct biltin { 392 char *bi_service; /* internally provided service name */ 393 int bi_socktype; /* type of socket supported */ 394 short bi_fork; /* 1 if should fork before call */ 395 short bi_wait; /* 1 if should wait for child */ 396 void (*bi_fn) __P((int, struct servtab *)); 397 /* function which performs it */ 398} biltins[] = { 399 /* Echo received data */ 400 { "echo", SOCK_STREAM, 1, 0, echo_stream }, 401 { "echo", SOCK_DGRAM, 0, 0, echo_dg }, 402 403 /* Internet /dev/null */ 404 { "discard", SOCK_STREAM, 1, 0, discard_stream }, 405 { "discard", SOCK_DGRAM, 0, 0, discard_dg }, 406 407 /* Return 32 bit time since 1970 */ 408 { "time", SOCK_STREAM, 0, 0, machtime_stream }, 409 { "time", SOCK_DGRAM, 0, 0, machtime_dg }, 410 411 /* Return human-readable time */ 412 { "daytime", SOCK_STREAM, 0, 0, daytime_stream }, 413 { "daytime", SOCK_DGRAM, 0, 0, daytime_dg }, 414 415 /* Familiar character generator */ 416 { "chargen", SOCK_STREAM, 1, 0, chargen_stream }, 417 { "chargen", SOCK_DGRAM, 0, 0, chargen_dg }, 418 419 { "tcpmux", SOCK_STREAM, 1, 0, tcpmux }, 420 421 { NULL } 422}; 423 424/* list of "bad" ports. I.e. ports that are most obviously used for 425 * "cycling packets" denial of service attacks. See /etc/services. 426 * List must end with port number "0". 427 */ 428 429u_int16_t bad_ports[] = { 7, 9, 13, 19, 37, 0}; 430 431 432#define NUMINT (sizeof(intab) / sizeof(struct inent)) 433char *CONFIG = _PATH_INETDCONF; 434char **Argv; 435char *LastArg; 436extern char *__progname; 437 438int 439main(argc, argv, envp) 440 int argc; 441 char *argv[], *envp[]; 442{ 443 struct servtab *sep, *nsep; 444 struct sigvec sv; 445 int ch, dofork; 446 pid_t pid; 447 448 Argv = argv; 449 if (envp == 0 || *envp == 0) 450 envp = argv; 451 while (*envp) 452 envp++; 453 LastArg = envp[-1] + strlen(envp[-1]); 454 455 while ((ch = getopt(argc, argv, 456#ifdef LIBWRAP 457 "dl" 458#else 459 "d" 460#endif 461 )) != -1) 462 switch(ch) { 463 case 'd': 464 debug = 1; 465 options |= SO_DEBUG; 466 break; 467#ifdef LIBWRAP 468 case 'l': 469 lflag = 1; 470 break; 471#endif 472 case '?': 473 default: 474 usage(); 475 } 476 argc -= optind; 477 argv += optind; 478 479 if (argc > 0) 480 CONFIG = argv[0]; 481 482 if (debug == 0) 483 daemon(0, 0); 484 openlog(__progname, LOG_PID | LOG_NOWAIT, LOG_DAEMON); 485 pidfile(NULL); 486 487#ifdef RLIMIT_NOFILE 488 if (getrlimit(RLIMIT_NOFILE, &rlim_ofile) < 0) { 489 syslog(LOG_ERR, "getrlimit: %m"); 490 } else { 491 rlim_ofile_cur = rlim_ofile.rlim_cur; 492 if (rlim_ofile_cur == RLIM_INFINITY) /* ! */ 493 rlim_ofile_cur = OPEN_MAX; 494 } 495#endif 496 497 memset(&sv, 0, sizeof(sv)); 498 sv.sv_mask = SIGBLOCK; 499 sv.sv_handler = retry; 500 sigvec(SIGALRM, &sv, (struct sigvec *)0); 501 config(SIGHUP); 502 sv.sv_handler = config; 503 sigvec(SIGHUP, &sv, (struct sigvec *)0); 504 sv.sv_handler = reapchild; 505 sigvec(SIGCHLD, &sv, (struct sigvec *)0); 506 sv.sv_handler = goaway; 507 sigvec(SIGTERM, &sv, (struct sigvec *)0); 508 sv.sv_handler = goaway; 509 sigvec(SIGINT, &sv, (struct sigvec *)0); 510 sv.sv_mask = 0L; 511 sv.sv_handler = SIG_IGN; 512 sigvec(SIGPIPE, &sv, (struct sigvec *)0); 513 514 { 515 /* space for daemons to overwrite environment for ps */ 516#define DUMMYSIZE 100 517 char dummy[DUMMYSIZE]; 518 519 (void)memset(dummy, 'x', DUMMYSIZE - 1); 520 dummy[DUMMYSIZE - 1] = '\0'; 521 522 (void)setenv("inetd_dummy", dummy, 1); 523 } 524 525 for (;;) { 526 int n, ctrl; 527 fd_set readable; 528 529 if (nsock == 0) { 530 (void) sigblock(SIGBLOCK); 531 while (nsock == 0) 532 sigpause(0L); 533 (void) sigsetmask(0L); 534 } 535 readable = allsock; 536 if ((n = select(maxsock + 1, &readable, (fd_set *)0, 537 (fd_set *)0, (struct timeval *)0)) <= 0) { 538 if (n == -1 && errno != EINTR) { 539 syslog(LOG_WARNING, "select: %m"); 540 sleep(1); 541 } 542 continue; 543 } 544 for (sep = servtab; n && sep; sep = nsep) { 545 nsep = sep->se_next; 546 if (sep->se_fd != -1 && FD_ISSET(sep->se_fd, &readable)) { 547 n--; 548 if (debug) 549 fprintf(stderr, "someone wants %s\n", sep->se_service); 550 if (!sep->se_wait && sep->se_socktype == SOCK_STREAM) { 551 /* XXX here do the libwrap check-before-accept */ 552 ctrl = accept(sep->se_fd, (struct sockaddr *)0, 553 (int *)0); 554 if (debug) 555 fprintf(stderr, "accept, ctrl %d\n", ctrl); 556 if (ctrl < 0) { 557 if (errno != EINTR) 558 syslog(LOG_WARNING, 559 "accept (for %s): %m", 560 sep->se_service); 561 continue; 562 } 563 } else 564 ctrl = sep->se_fd; 565 (void) sigblock(SIGBLOCK); 566 pid = 0; 567#ifdef LIBWRAP_INTERNAL 568 dofork = 1; 569#else 570 dofork = (sep->se_bi == 0 || sep->se_bi->bi_fork); 571#endif 572 if (dofork) { 573 if (sep->se_count++ == 0) 574 (void)gettimeofday(&sep->se_time, 575 (struct timezone *)0); 576 else if (sep->se_count >= sep->se_max) { 577 struct timeval now; 578 579 (void)gettimeofday(&now, (struct timezone *)0); 580 if (now.tv_sec - sep->se_time.tv_sec > 581 CNT_INTVL) { 582 sep->se_time = now; 583 sep->se_count = 1; 584 } else { 585 syslog(LOG_ERR, 586 "%s/%s server failing (looping), service terminated\n", 587 sep->se_service, sep->se_proto); 588 if (!sep->se_wait && sep->se_socktype == SOCK_STREAM) 589 close(ctrl); 590 close_sep(sep); 591 sigsetmask(0L); 592 if (!timingout) { 593 timingout = 1; 594 alarm(RETRYTIME); 595 } 596 continue; 597 } 598 } 599 pid = fork(); 600 if (pid < 0) { 601 syslog(LOG_ERR, "fork: %m"); 602 if (!sep->se_wait && sep->se_socktype == SOCK_STREAM) 603 close(ctrl); 604 sigsetmask(0L); 605 sleep(1); 606 continue; 607 } 608 if (pid != 0 && sep->se_wait) { 609 sep->se_wait = pid; 610 FD_CLR(sep->se_fd, &allsock); 611 nsock--; 612 } 613 if (pid == 0) { 614 sv.sv_mask = 0L; 615 sv.sv_handler = SIG_DFL; 616 sigvec(SIGPIPE, &sv, (struct sigvec *)0); 617 if (debug) 618 setsid(); 619 } 620 } 621 sigsetmask(0L); 622 if (pid == 0) { 623 run_service(ctrl, sep); 624 if (dofork) 625 exit(0); 626 } 627 if (!sep->se_wait && sep->se_socktype == SOCK_STREAM) 628 close(ctrl); 629 } 630 } 631 } 632} 633 634void 635run_service(ctrl, sep) 636 int ctrl; 637 struct servtab *sep; 638{ 639 struct passwd *pwd; 640 struct group *grp = NULL; /* XXX gcc */ 641 char buf[NI_MAXSERV]; 642#ifdef LIBWRAP 643 struct request_info req; 644 int denied; 645 char *service = NULL; /* XXX gcc */ 646#endif 647 648#ifdef LIBWRAP 649#ifndef LIBWRAP_INTERNAL 650 if (sep->se_bi == 0) 651#endif 652 if (!sep->se_wait && sep->se_socktype == SOCK_STREAM) { 653 request_init(&req, RQ_DAEMON, sep->se_argv[0] ? 654 sep->se_argv[0] : sep->se_service, RQ_FILE, ctrl, NULL); 655 fromhost(&req); 656 denied = !hosts_access(&req); 657 if (denied || lflag) { 658 if (getnameinfo(&sep->se_ctrladdr, 659 sep->se_ctrladdr.sa_len, NULL, 0, 660 buf, sizeof(buf), 0) != 0) { 661 /* shouldn't happen */ 662 (void)snprintf(buf, sizeof buf, "%d", 663 ntohs(sep->se_ctrladdr_in.sin_port)); 664 } 665 service = buf; 666 } 667 if (denied) { 668 syslog(deny_severity, 669 "refused connection from %.500s, service %s (%s)", 670 eval_client(&req), service, sep->se_proto); 671 goto reject; 672 } 673 if (lflag) { 674 syslog(allow_severity, 675 "connection from %.500s, service %s (%s)", 676 eval_client(&req), service, sep->se_proto); 677 } 678 } 679#endif /* LIBWRAP */ 680 681 if (sep->se_bi) { 682 (*sep->se_bi->bi_fn)(ctrl, sep); 683 } else { 684 if ((pwd = getpwnam(sep->se_user)) == NULL) { 685 syslog(LOG_ERR, "%s/%s: %s: No such user", 686 sep->se_service, sep->se_proto, sep->se_user); 687 goto reject; 688 } 689 if (sep->se_group && 690 (grp = getgrnam(sep->se_group)) == NULL) { 691 syslog(LOG_ERR, "%s/%s: %s: No such group", 692 sep->se_service, sep->se_proto, sep->se_group); 693 goto reject; 694 } 695 if (pwd->pw_uid) { 696 if (sep->se_group) 697 pwd->pw_gid = grp->gr_gid; 698 if (setgid(pwd->pw_gid) < 0) { 699 syslog(LOG_ERR, 700 "%s/%s: can't set gid %d: %m", sep->se_service, 701 sep->se_proto, pwd->pw_gid); 702 goto reject; 703 } 704 (void) initgroups(pwd->pw_name, 705 pwd->pw_gid); 706 if (setuid(pwd->pw_uid) < 0) { 707 syslog(LOG_ERR, 708 "%s/%s: can't set uid %d: %m", sep->se_service, 709 sep->se_proto, pwd->pw_uid); 710 goto reject; 711 } 712 } else if (sep->se_group) { 713 (void) setgid((gid_t)grp->gr_gid); 714 } 715 if (debug) 716 fprintf(stderr, "%d execl %s\n", 717 getpid(), sep->se_server); 718#ifdef MULOG 719 if (sep->se_log) 720 dolog(sep, ctrl); 721#endif 722 /* Set our control descriptor to not close-on-exec... */ 723 if (fcntl(ctrl, F_SETFD, 0) < 0) 724 syslog(LOG_ERR, "fcntl (F_SETFD, 0): %m"); 725 /* ...and dup it to stdin, stdout, and stderr. */ 726 if (ctrl != 0) { 727 dup2(ctrl, 0); 728 close(ctrl); 729 ctrl = 0; 730 } 731 dup2(0, 1); 732 dup2(0, 2); 733#ifdef RLIMIT_NOFILE 734 if (rlim_ofile.rlim_cur != rlim_ofile_cur && 735 setrlimit(RLIMIT_NOFILE, &rlim_ofile) < 0) 736 syslog(LOG_ERR, "setrlimit: %m"); 737#endif 738 execv(sep->se_server, sep->se_argv); 739 syslog(LOG_ERR, "cannot execute %s: %m", sep->se_server); 740 reject: 741 if (sep->se_socktype != SOCK_STREAM) 742 recv(ctrl, buf, sizeof (buf), 0); 743 _exit(1); 744 } 745} 746 747void 748reapchild(signo) 749 int signo; 750{ 751 int status; 752 pid_t pid; 753 struct servtab *sep; 754 755 for (;;) { 756 pid = wait3(&status, WNOHANG, (struct rusage *)0); 757 if (pid <= 0) 758 break; 759 if (debug) 760 fprintf(stderr, "%d reaped, status %#x\n", 761 pid, status); 762 for (sep = servtab; sep; sep = sep->se_next) 763 if (sep->se_wait == pid) { 764 if (WIFEXITED(status) && WEXITSTATUS(status)) 765 syslog(LOG_WARNING, 766 "%s: exit status 0x%x", 767 sep->se_server, WEXITSTATUS(status)); 768 else if (WIFSIGNALED(status)) 769 syslog(LOG_WARNING, 770 "%s: exit signal 0x%x", 771 sep->se_server, WTERMSIG(status)); 772 sep->se_wait = 1; 773 FD_SET(sep->se_fd, &allsock); 774 nsock++; 775 if (debug) 776 fprintf(stderr, "restored %s, fd %d\n", 777 sep->se_service, sep->se_fd); 778 } 779 } 780} 781 782void 783config(signo) 784 int signo; 785{ 786 struct servtab *sep, *cp, **sepp; 787 long omask; 788 int n; 789 790 if (!setconfig()) { 791 syslog(LOG_ERR, "%s: %m", CONFIG); 792 return; 793 } 794 for (sep = servtab; sep; sep = sep->se_next) 795 sep->se_checked = 0; 796 while ((cp = getconfigent())) { 797 for (sep = servtab; sep; sep = sep->se_next) 798 if (strcmp(sep->se_service, cp->se_service) == 0 && 799 strcmp(sep->se_hostaddr, cp->se_hostaddr) == 0 && 800 strcmp(sep->se_proto, cp->se_proto) == 0 && 801 ISMUX(sep) == ISMUX(cp)) 802 break; 803 if (sep != 0) { 804 int i; 805 806#define SWAP(type, a, b) {type c=(type)a; (type)a=(type)b; (type)b=(type)c;} 807 808 omask = sigblock(SIGBLOCK); 809 /* 810 * sep->se_wait may be holding the pid of a daemon 811 * that we're waiting for. If so, don't overwrite 812 * it unless the config file explicitly says don't 813 * wait. 814 */ 815 if (cp->se_bi == 0 && 816 (sep->se_wait == 1 || cp->se_wait == 0)) 817 sep->se_wait = cp->se_wait; 818 SWAP(char *, sep->se_user, cp->se_user); 819 SWAP(char *, sep->se_group, cp->se_group); 820 SWAP(char *, sep->se_server, cp->se_server); 821 for (i = 0; i < MAXARGV; i++) 822 SWAP(char *, sep->se_argv[i], cp->se_argv[i]); 823#ifdef IPSEC 824 SWAP(char *, sep->se_policy, cp->se_policy); 825#endif 826 SWAP(int, cp->se_type, sep->se_type); 827 SWAP(int, cp->se_max, sep->se_max); 828#undef SWAP 829 if (isrpcservice(sep)) 830 unregister_rpc(sep); 831 sep->se_rpcversl = cp->se_rpcversl; 832 sep->se_rpcversh = cp->se_rpcversh; 833 sigsetmask(omask); 834 freeconfig(cp); 835 if (debug) 836 print_service("REDO", sep); 837 } else { 838 sep = enter(cp); 839 if (debug) 840 print_service("ADD ", sep); 841 } 842 sep->se_checked = 1; 843 844 switch (sep->se_family) { 845 case AF_LOCAL: 846 if (sep->se_fd != -1) 847 break; 848 n = strlen(sep->se_service); 849 if (n > sizeof(sep->se_ctrladdr_un.sun_path)) { 850 syslog(LOG_ERR, "%s: address too long", 851 sep->se_service); 852 sep->se_checked = 0; 853 continue; 854 } 855 (void)unlink(sep->se_service); 856 strncpy(sep->se_ctrladdr_un.sun_path, 857 sep->se_service, n); 858 sep->se_ctrladdr_un.sun_family = AF_LOCAL; 859 sep->se_ctrladdr_size = n + 860 sizeof(sep->se_ctrladdr_un) - 861 sizeof(sep->se_ctrladdr_un.sun_path); 862 if (!ISMUX(sep)) 863 setup(sep); 864 break; 865 case AF_INET: 866#ifdef INET6 867 case AF_INET6: 868#endif 869 { 870 struct addrinfo hints, *res; 871 char *host, *port; 872 int error; 873 874 memset(&hints, 0, sizeof(hints)); 875 hints.ai_family = sep->se_family; 876 hints.ai_socktype = sep->se_socktype; 877 hints.ai_flags = AI_PASSIVE; 878 if (!strcmp(sep->se_hostaddr, "*")) 879 host = NULL; 880 else 881 host = sep->se_hostaddr; 882 if (isrpcservice(sep) || ISMUX(sep)) 883 port = "0"; 884 else 885 port = sep->se_service; 886 error = getaddrinfo(host, port, &hints, &res); 887 if (error) { 888 if (error == EAI_FAMILY && host == NULL) { 889 syslog(LOG_WARNING, "%s/%s: %s: " 890 "the address family is not " 891 "supported by the kernel", 892 sep->se_service, sep->se_proto, 893 sep->se_hostaddr); 894 } else if (error == EAI_SERVICE) { 895 syslog(LOG_WARNING, "%s/%s: " 896 "unknown service", 897 sep->se_service, sep->se_proto); 898 } else { 899 syslog(LOG_ERR, "%s/%s: %s: %s", 900 sep->se_service, sep->se_proto, 901 sep->se_hostaddr, 902 gai_strerror(error)); 903 } 904 sep->se_checked = 0; 905 continue; 906 } 907 if (res->ai_next) { 908 syslog(LOG_ERR, 909 "%s/%s: %s: resolved to multiple addr", 910 sep->se_service, sep->se_proto, 911 sep->se_hostaddr); 912 sep->se_checked = 0; 913 freeaddrinfo(res); 914 continue; 915 } 916 memcpy(&sep->se_ctrladdr, res->ai_addr, 917 res->ai_addrlen); 918 if (ISMUX(sep)) { 919 sep->se_fd = -1; 920 freeaddrinfo(res); 921 continue; 922 } 923 sep->se_ctrladdr_size = res->ai_addrlen; 924 freeaddrinfo(res); 925#ifdef RPC 926 if (isrpcservice(sep)) { 927 struct rpcent *rp; 928 929 sep->se_rpcprog = atoi(sep->se_service); 930 if (sep->se_rpcprog == 0) { 931 rp = getrpcbyname(sep->se_service); 932 if (rp == 0) { 933 syslog(LOG_ERR, 934 "%s/%s: unknown service", 935 sep->se_service, 936 sep->se_proto); 937 sep->se_checked = 0; 938 continue; 939 } 940 sep->se_rpcprog = rp->r_number; 941 } 942 if (sep->se_fd == -1 && !ISMUX(sep)) 943 setup(sep); 944 if (sep->se_fd != -1) 945 register_rpc(sep); 946 } else 947#endif 948 { 949 if (sep->se_fd >= 0) 950 close_sep(sep); 951 if (sep->se_fd == -1 && !ISMUX(sep)) 952 setup(sep); 953 } 954 } 955 } 956 } 957 endconfig(); 958 /* 959 * Purge anything not looked at above. 960 */ 961 omask = sigblock(SIGBLOCK); 962 sepp = &servtab; 963 while ((sep = *sepp)) { 964 if (sep->se_checked) { 965 sepp = &sep->se_next; 966 continue; 967 } 968 *sepp = sep->se_next; 969 if (sep->se_fd >= 0) 970 close_sep(sep); 971 if (isrpcservice(sep)) 972 unregister_rpc(sep); 973 if (sep->se_family == AF_LOCAL) 974 (void)unlink(sep->se_service); 975 if (debug) 976 print_service("FREE", sep); 977 freeconfig(sep); 978 free((char *)sep); 979 } 980 (void) sigsetmask(omask); 981} 982 983void 984retry(signo) 985 int signo; 986{ 987 struct servtab *sep; 988 989 timingout = 0; 990 for (sep = servtab; sep; sep = sep->se_next) { 991 if (sep->se_fd == -1 && !ISMUX(sep)) { 992 switch (sep->se_family) { 993 case AF_LOCAL: 994 case AF_INET: 995#ifdef INET6 996 case AF_INET6: 997#endif 998 setup(sep); 999 if (sep->se_fd != -1 && isrpcservice(sep)) 1000 register_rpc(sep); 1001 break; 1002 } 1003 } 1004 } 1005} 1006 1007void 1008goaway(signo) 1009 int signo; 1010{ 1011 struct servtab *sep; 1012 1013 for (sep = servtab; sep; sep = sep->se_next) { 1014 if (sep->se_fd == -1) 1015 continue; 1016 1017 switch (sep->se_family) { 1018 case AF_LOCAL: 1019 (void)unlink(sep->se_service); 1020 break; 1021 case AF_INET: 1022#ifdef INET6 1023 case AF_INET6: 1024#endif 1025 if (sep->se_wait == 1 && isrpcservice(sep)) 1026 unregister_rpc(sep); 1027 break; 1028 } 1029 (void)close(sep->se_fd); 1030 } 1031 exit(0); 1032} 1033 1034void 1035setup(sep) 1036 struct servtab *sep; 1037{ 1038 int on = 1; 1039 1040 if ((sep->se_fd = socket(sep->se_family, sep->se_socktype, 0)) < 0) { 1041 if (debug) 1042 fprintf(stderr, "socket failed on %s/%s: %s\n", 1043 sep->se_service, sep->se_proto, strerror(errno)); 1044 syslog(LOG_ERR, "%s/%s: socket: %m", 1045 sep->se_service, sep->se_proto); 1046 return; 1047 } 1048 /* Set all listening sockets to close-on-exec. */ 1049 if (fcntl(sep->se_fd, F_SETFD, FD_CLOEXEC) < 0) 1050 syslog(LOG_ERR, "fcntl (F_SETFD, FD_CLOEXEC): %m"); 1051 1052#define turnon(fd, opt) \ 1053setsockopt(fd, SOL_SOCKET, opt, (char *)&on, sizeof (on)) 1054 if (strcmp(sep->se_proto, "tcp") == 0 && (options & SO_DEBUG) && 1055 turnon(sep->se_fd, SO_DEBUG) < 0) 1056 syslog(LOG_ERR, "setsockopt (SO_DEBUG): %m"); 1057 if (turnon(sep->se_fd, SO_REUSEADDR) < 0) 1058 syslog(LOG_ERR, "setsockopt (SO_REUSEADDR): %m"); 1059#undef turnon 1060 1061 /* Set the socket buffer sizes, if specified. */ 1062 if (sep->se_sndbuf != 0 && setsockopt(sep->se_fd, SOL_SOCKET, 1063 SO_SNDBUF, (char *)&sep->se_sndbuf, sizeof(sep->se_sndbuf)) < 0) 1064 syslog(LOG_ERR, "setsockopt (SO_SNDBUF %d): %m", 1065 sep->se_sndbuf); 1066 if (sep->se_rcvbuf != 0 && setsockopt(sep->se_fd, SOL_SOCKET, 1067 SO_RCVBUF, (char *)&sep->se_rcvbuf, sizeof(sep->se_rcvbuf)) < 0) 1068 syslog(LOG_ERR, "setsockopt (SO_RCVBUF %d): %m", 1069 sep->se_rcvbuf); 1070 if (sep->se_type == FAITH_TYPE && setsockopt(sep->se_fd, IPPROTO_IPV6, 1071 IPV6_FAITH, (char *)&on, sizeof(on)) < 0) 1072 syslog(LOG_ERR, "setsockopt (IPV6_FAITH): %m"); 1073#ifdef IPSEC 1074 if (ipsecsetup(sep->se_family, sep->se_fd, sep->se_policy) < 0 && 1075 sep->se_policy) { 1076 syslog(LOG_ERR, "%s/%s: ipsec setup failed", 1077 sep->se_service, sep->se_proto); 1078 (void)close(sep->se_fd); 1079 sep->se_fd = -1; 1080 return; 1081 } 1082#endif 1083 1084 if (bind(sep->se_fd, &sep->se_ctrladdr, sep->se_ctrladdr_size) < 0) { 1085 if (debug) 1086 fprintf(stderr, "bind failed on %s/%s: %s\n", 1087 sep->se_service, sep->se_proto, strerror(errno)); 1088 syslog(LOG_ERR, "%s/%s: bind: %m", 1089 sep->se_service, sep->se_proto); 1090 (void) close(sep->se_fd); 1091 sep->se_fd = -1; 1092 if (!timingout) { 1093 timingout = 1; 1094 alarm(RETRYTIME); 1095 } 1096 return; 1097 } 1098 if (sep->se_socktype == SOCK_STREAM) 1099 listen(sep->se_fd, 10); 1100 1101 FD_SET(sep->se_fd, &allsock); 1102 nsock++; 1103 if (sep->se_fd > maxsock) { 1104 maxsock = sep->se_fd; 1105 if (maxsock > rlim_ofile_cur - FD_MARGIN) 1106 bump_nofile(); 1107 } 1108 if (debug) 1109 fprintf(stderr, "registered %s on %d\n", 1110 sep->se_server, sep->se_fd); 1111} 1112 1113/* 1114 * Finish with a service and its socket. 1115 */ 1116void 1117close_sep(sep) 1118 struct servtab *sep; 1119{ 1120 if (sep->se_fd >= 0) { 1121 nsock--; 1122 FD_CLR(sep->se_fd, &allsock); 1123 (void) close(sep->se_fd); 1124 sep->se_fd = -1; 1125 } 1126 sep->se_count = 0; 1127 /* 1128 * Don't keep the pid of this running deamon: when reapchild() 1129 * reaps this pid, it would erroneously increment nsock. 1130 */ 1131 if (sep->se_wait > 1) 1132 sep->se_wait = 1; 1133} 1134 1135void 1136register_rpc(sep) 1137 struct servtab *sep; 1138{ 1139#ifdef RPC 1140 int n; 1141 struct netbuf nbuf; 1142 struct sockaddr_storage ss; 1143 struct netconfig *nconf; 1144 1145 if ((nconf = getnetconfigent(sep->se_proto+4)) == NULL) { 1146 syslog(LOG_ERR, "%s: getnetconfigent failed", 1147 sep->se_proto); 1148 return; 1149 } 1150 n = sizeof ss; 1151 if (getsockname(sep->se_fd, (struct sockaddr *)&ss, &n) < 0) { 1152 syslog(LOG_ERR, "%s/%s: getsockname: %m", 1153 sep->se_service, sep->se_proto); 1154 return; 1155 } 1156 1157 nbuf.buf = &ss; 1158 nbuf.len = ss.ss_len; 1159 nbuf.maxlen = sizeof (struct sockaddr_storage); 1160 for (n = sep->se_rpcversl; n <= sep->se_rpcversh; n++) { 1161 if (debug) 1162 fprintf(stderr, "rpcb_set: %u %d %s %s\n", 1163 sep->se_rpcprog, n, nconf->nc_netid, 1164 taddr2uaddr(nconf, &nbuf)); 1165 (void)rpcb_unset(sep->se_rpcprog, n, nconf); 1166 if (!rpcb_set(sep->se_rpcprog, n, nconf, &nbuf)) 1167 syslog(LOG_ERR, "rpcb_set: %u %d %s %s%s", 1168 sep->se_rpcprog, n, nconf->nc_netid, 1169 taddr2uaddr(nconf, &nbuf), clnt_spcreateerror("")); 1170 } 1171#endif /* RPC */ 1172} 1173 1174void 1175unregister_rpc(sep) 1176 struct servtab *sep; 1177{ 1178#ifdef RPC 1179 int n; 1180 struct netconfig *nconf; 1181 1182 if ((nconf = getnetconfigent(sep->se_proto+4)) == NULL) { 1183 syslog(LOG_ERR, "%s: getnetconfigent failed", 1184 sep->se_proto); 1185 return; 1186 } 1187 1188 for (n = sep->se_rpcversl; n <= sep->se_rpcversh; n++) { 1189 if (debug) 1190 fprintf(stderr, "rpcb_unset(%u, %d, %s)\n", 1191 sep->se_rpcprog, n, nconf->nc_netid); 1192 if (!rpcb_unset(sep->se_rpcprog, n, nconf)) 1193 syslog(LOG_ERR, "rpcb_unset(%u, %d, %s) failed\n", 1194 sep->se_rpcprog, n, nconf->nc_netid); 1195 } 1196#endif /* RPC */ 1197} 1198 1199 1200struct servtab * 1201enter(cp) 1202 struct servtab *cp; 1203{ 1204 struct servtab *sep; 1205 long omask; 1206 1207 sep = (struct servtab *)malloc(sizeof (*sep)); 1208 if (sep == (struct servtab *)0) { 1209 syslog(LOG_ERR, "Out of memory."); 1210 exit(-1); 1211 } 1212 *sep = *cp; 1213 sep->se_fd = -1; 1214 sep->se_rpcprog = -1; 1215 omask = sigblock(SIGBLOCK); 1216 sep->se_next = servtab; 1217 servtab = sep; 1218 sigsetmask(omask); 1219 return (sep); 1220} 1221 1222FILE *fconfig = NULL; 1223struct servtab serv; 1224char line[LINE_MAX]; 1225char *defhost; 1226#ifdef IPSEC 1227static char *policy = NULL; 1228#endif 1229 1230int 1231setconfig() 1232{ 1233 if (defhost) 1234 free(defhost); 1235 defhost = newstr("*"); 1236#ifdef IPSEC 1237 if (policy) 1238 free(policy); 1239 policy = NULL; 1240#endif 1241 if (fconfig != NULL) { 1242 fseek(fconfig, 0L, SEEK_SET); 1243 return (1); 1244 } 1245 fconfig = fopen(CONFIG, "r"); 1246 return (fconfig != NULL); 1247} 1248 1249void 1250endconfig() 1251{ 1252 if (fconfig) { 1253 (void) fclose(fconfig); 1254 fconfig = NULL; 1255 } 1256 if (defhost) { 1257 free(defhost); 1258 defhost = 0; 1259 } 1260} 1261 1262struct servtab * 1263getconfigent() 1264{ 1265 struct servtab *sep = &serv; 1266 int argc, val; 1267 char *cp, *cp0, *arg, *buf0, *buf1, *sz0, *sz1; 1268 static char TCPMUX_TOKEN[] = "tcpmux/"; 1269#define MUX_LEN (sizeof(TCPMUX_TOKEN)-1) 1270 char *hostdelim; 1271 1272more: 1273 while ((cp = nextline(fconfig))) { 1274#ifdef IPSEC 1275 /* lines starting with #@ is not a comment, but the policy */ 1276 if (cp[0] == '#' && cp[1] == '@') { 1277 char *p; 1278 for (p = cp + 2; p && *p && isspace(*p); p++) 1279 ; 1280 if (*p == '\0') { 1281 if (policy) 1282 free(policy); 1283 policy = NULL; 1284 } else { 1285 if (ipsecsetup_test(p) < 0) { 1286 syslog(LOG_ERR, 1287 "%s: invalid ipsec policy \"%s\"", 1288 CONFIG, p); 1289 exit(-1); 1290 } else { 1291 if (policy) 1292 free(policy); 1293 policy = newstr(p); 1294 } 1295 } 1296 } 1297#endif 1298 if (*cp == '#' || *cp == '\0') 1299 continue; 1300#ifdef MULOG 1301 /* Avoid use of `skip' if there is a danger of it looking 1302 * at continuation lines. 1303 */ 1304 do { 1305 cp++; 1306 } while (*cp == ' ' || *cp == '\t'); 1307 if (*cp == '\0') 1308 continue; 1309 if ((arg = skip(&cp)) == NULL) 1310 continue; 1311 if (strcmp(arg, "DOMAIN")) 1312 continue; 1313 if (curdom) 1314 free(curdom); 1315 curdom = NULL; 1316 while (*cp == ' ' || *cp == '\t') 1317 cp++; 1318 if (*cp == '\0') 1319 continue; 1320 arg = cp; 1321 while (*cp && *cp != ' ' && *cp != '\t') 1322 cp++; 1323 if (*cp != '\0') 1324 *cp++ = '\0'; 1325 curdom = newstr(arg); 1326#endif 1327 break; 1328 } 1329 if (cp == NULL) 1330 return ((struct servtab *)0); 1331 /* 1332 * clear the static buffer, since some fields (se_ctrladdr, 1333 * for example) don't get initialized here. 1334 */ 1335 memset((caddr_t)sep, 0, sizeof *sep); 1336 arg = skip(&cp); 1337 if (cp == NULL) { 1338 /* got an empty line containing just blanks/tabs. */ 1339 goto more; 1340 } 1341 /* Check for a host name. */ 1342 hostdelim = strrchr(arg, ':'); 1343 if (hostdelim) { 1344 *hostdelim = '\0'; 1345 sep->se_hostaddr = newstr(arg); 1346 arg = hostdelim + 1; 1347 /* 1348 * If the line is of the form `host:', then just change the 1349 * default host for the following lines. 1350 */ 1351 if (*arg == '\0') { 1352 arg = skip(&cp); 1353 if (cp == NULL) { 1354 free(defhost); 1355 defhost = sep->se_hostaddr; 1356 goto more; 1357 } 1358 } 1359 } else 1360 sep->se_hostaddr = newstr(defhost); 1361 if (strncmp(arg, TCPMUX_TOKEN, MUX_LEN) == 0) { 1362 char *c = arg + MUX_LEN; 1363 if (*c == '+') { 1364 sep->se_type = MUXPLUS_TYPE; 1365 c++; 1366 } else 1367 sep->se_type = MUX_TYPE; 1368 sep->se_service = newstr(c); 1369 } else { 1370 sep->se_service = newstr(arg); 1371 sep->se_type = NORM_TYPE; 1372 } 1373 1374 arg = sskip(&cp); 1375 if (strcmp(arg, "stream") == 0) 1376 sep->se_socktype = SOCK_STREAM; 1377 else if (strcmp(arg, "dgram") == 0) 1378 sep->se_socktype = SOCK_DGRAM; 1379 else if (strcmp(arg, "rdm") == 0) 1380 sep->se_socktype = SOCK_RDM; 1381 else if (strcmp(arg, "seqpacket") == 0) 1382 sep->se_socktype = SOCK_SEQPACKET; 1383 else if (strcmp(arg, "raw") == 0) 1384 sep->se_socktype = SOCK_RAW; 1385 else 1386 sep->se_socktype = -1; 1387 1388 arg = sskip(&cp); 1389 if (sep->se_type == NORM_TYPE && 1390 strncmp(arg, "faith/", strlen("faith/")) == 0) { 1391 arg += strlen("faith/"); 1392 sep->se_type = FAITH_TYPE; 1393 } 1394 sep->se_proto = newstr(arg); 1395 1396#define MALFORMED(arg) \ 1397do { \ 1398 syslog(LOG_ERR, "%s: malformed buffer size option `%s'", \ 1399 sep->se_service, (arg)); \ 1400 goto more; \ 1401} while (0) 1402 1403#define GETVAL(arg) \ 1404do { \ 1405 if (!isdigit(*(arg))) \ 1406 MALFORMED(arg); \ 1407 val = strtol((arg), &cp0, 10); \ 1408 if (cp0 != NULL) { \ 1409 if (cp0[1] != '\0') \ 1410 MALFORMED((arg)); \ 1411 if (cp0[0] == 'k') \ 1412 val *= 1024; \ 1413 if (cp0[0] == 'm') \ 1414 val *= 1024 * 1024; \ 1415 } \ 1416 if (val < 1) { \ 1417 syslog(LOG_ERR, "%s: invalid buffer size `%s'", \ 1418 sep->se_service, (arg)); \ 1419 goto more; \ 1420 } \ 1421} while (0) 1422 1423#define ASSIGN(arg) \ 1424do { \ 1425 if (strcmp((arg), "sndbuf") == 0) \ 1426 sep->se_sndbuf = val; \ 1427 else if (strcmp((arg), "rcvbuf") == 0) \ 1428 sep->se_rcvbuf = val; \ 1429 else \ 1430 MALFORMED((arg)); \ 1431} while (0) 1432 1433 /* 1434 * Extract the send and receive buffer sizes before parsing 1435 * the protocol. 1436 */ 1437 sep->se_sndbuf = sep->se_rcvbuf = 0; 1438 buf0 = buf1 = sz0 = sz1 = NULL; 1439 if ((buf0 = strchr(sep->se_proto, ',')) != NULL) { 1440 /* Not meaningful for Tcpmux services. */ 1441 if (ISMUX(sep)) { 1442 syslog(LOG_ERR, "%s: can't specify buffer sizes for " 1443 "tcpmux services", sep->se_service); 1444 goto more; 1445 } 1446 1447 /* Skip the , */ 1448 *buf0++ = '\0'; 1449 1450 /* Check to see if another socket buffer size was specified. */ 1451 if ((buf1 = strchr(buf0, ',')) != NULL) { 1452 /* Skip the , */ 1453 *buf1++ = '\0'; 1454 1455 /* Make sure a 3rd one wasn't specified. */ 1456 if (strchr(buf1, ',') != NULL) { 1457 syslog(LOG_ERR, "%s: too many buffer sizes", 1458 sep->se_service); 1459 goto more; 1460 } 1461 1462 /* Locate the size. */ 1463 if ((sz1 = strchr(buf1, '=')) == NULL) 1464 MALFORMED(buf1); 1465 1466 /* Skip the = */ 1467 *sz1++ = '\0'; 1468 } 1469 1470 /* Locate the size. */ 1471 if ((sz0 = strchr(buf0, '=')) == NULL) 1472 MALFORMED(buf0); 1473 1474 /* Skip the = */ 1475 *sz0++ = '\0'; 1476 1477 GETVAL(sz0); 1478 ASSIGN(buf0); 1479 1480 if (buf1 != NULL) { 1481 GETVAL(sz1); 1482 ASSIGN(buf1); 1483 } 1484 } 1485 1486#undef ASSIGN 1487#undef GETVAL 1488#undef MALFORMED 1489 1490 if (strcmp(sep->se_proto, "unix") == 0) { 1491 sep->se_family = AF_LOCAL; 1492 } else { 1493 val = strlen(sep->se_proto); 1494 if (!val) { 1495 syslog(LOG_ERR, "%s: invalid protocol specified", 1496 sep->se_service); 1497 goto more; 1498 } 1499 val = sep->se_proto[val - 1]; 1500 switch (val) { 1501 case '4': /*tcp4 or udp4*/ 1502 sep->se_family = AF_INET; 1503 break; 1504#ifdef INET6 1505 case '6': /*tcp6 or udp6*/ 1506 sep->se_family = AF_INET6; 1507 break; 1508#endif 1509 default: 1510 sep->se_family = AF_INET; /*will become AF_INET6*/ 1511 break; 1512 } 1513 if (strncmp(sep->se_proto, "rpc/", 4) == 0) { 1514#ifdef RPC 1515 char *cp, *ccp; 1516 cp = strchr(sep->se_service, '/'); 1517 if (cp == 0) { 1518 syslog(LOG_ERR, "%s: no rpc version", 1519 sep->se_service); 1520 goto more; 1521 } 1522 *cp++ = '\0'; 1523 sep->se_rpcversl = sep->se_rpcversh = 1524 strtol(cp, &ccp, 0); 1525 if (ccp == cp) { 1526 badafterall: 1527 syslog(LOG_ERR, "%s/%s: bad rpc version", 1528 sep->se_service, cp); 1529 goto more; 1530 } 1531 if (*ccp == '-') { 1532 cp = ccp + 1; 1533 sep->se_rpcversh = strtol(cp, &ccp, 0); 1534 if (ccp == cp) 1535 goto badafterall; 1536 } 1537#else 1538 syslog(LOG_ERR, "%s: rpc services not suported", 1539 sep->se_service); 1540 goto more; 1541#endif /* RPC */ 1542 } 1543 } 1544 arg = sskip(&cp); 1545 { 1546 char *cp; 1547 if ((cp = strchr(arg, ':')) == NULL) 1548 cp = strchr(arg, '.'); 1549 if (cp != NULL) { 1550 *cp++ = '\0'; 1551 sep->se_max = atoi(cp); 1552 } else 1553 sep->se_max = TOOMANY; 1554 } 1555 sep->se_wait = strcmp(arg, "wait") == 0; 1556 if (ISMUX(sep)) { 1557 /* 1558 * Silently enforce "nowait" for TCPMUX services since 1559 * they don't have an assigned port to listen on. 1560 */ 1561 sep->se_wait = 0; 1562 1563 if (strncmp(sep->se_proto, "tcp", 3)) { 1564 syslog(LOG_ERR, 1565 "%s: bad protocol for tcpmux service %s", 1566 CONFIG, sep->se_service); 1567 goto more; 1568 } 1569 if (sep->se_socktype != SOCK_STREAM) { 1570 syslog(LOG_ERR, 1571 "%s: bad socket type for tcpmux service %s", 1572 CONFIG, sep->se_service); 1573 goto more; 1574 } 1575 } 1576 sep->se_user = newstr(sskip(&cp)); 1577 if ((sep->se_group = strchr(sep->se_user, ':')) != NULL) 1578 *sep->se_group++ = '\0'; 1579 else if ((sep->se_group = strchr(sep->se_user, '.')) != NULL) 1580 *sep->se_group++ = '\0'; 1581 1582 sep->se_server = newstr(sskip(&cp)); 1583 if (strcmp(sep->se_server, "internal") == 0) { 1584 struct biltin *bi; 1585 1586 for (bi = biltins; bi->bi_service; bi++) 1587 if (bi->bi_socktype == sep->se_socktype && 1588 strcmp(bi->bi_service, sep->se_service) == 0) 1589 break; 1590 if (bi->bi_service == 0) { 1591 syslog(LOG_ERR, "internal service %s unknown", 1592 sep->se_service); 1593 goto more; 1594 } 1595 sep->se_bi = bi; 1596 sep->se_wait = bi->bi_wait; 1597 } else 1598 sep->se_bi = NULL; 1599 argc = 0; 1600 for (arg = skip(&cp); cp; arg = skip(&cp)) { 1601#if MULOG 1602 char *colon; 1603 1604 if (argc == 0 && (colon = strrchr(arg, ':'))) { 1605 while (arg < colon) { 1606 int x; 1607 char *ccp; 1608 1609 switch (*arg++) { 1610 case 'l': 1611 x = 1; 1612 if (isdigit(*arg)) { 1613 x = strtol(arg, &ccp, 0); 1614 if (ccp == arg) 1615 break; 1616 arg = ccp; 1617 } 1618 sep->se_log &= ~MULOG_RFC931; 1619 sep->se_log |= x; 1620 break; 1621 case 'a': 1622 sep->se_log |= MULOG_RFC931; 1623 break; 1624 default: 1625 break; 1626 } 1627 } 1628 arg = colon + 1; 1629 } 1630#endif 1631 if (argc < MAXARGV) 1632 sep->se_argv[argc++] = newstr(arg); 1633 } 1634 while (argc <= MAXARGV) 1635 sep->se_argv[argc++] = NULL; 1636#ifdef IPSEC 1637 sep->se_policy = policy ? newstr(policy) : NULL; 1638#endif 1639 return (sep); 1640} 1641 1642void 1643freeconfig(cp) 1644 struct servtab *cp; 1645{ 1646 int i; 1647 1648 if (cp->se_hostaddr) 1649 free(cp->se_hostaddr); 1650 if (cp->se_service) 1651 free(cp->se_service); 1652 if (cp->se_proto) 1653 free(cp->se_proto); 1654 if (cp->se_user) 1655 free(cp->se_user); 1656 /* Note: se_group is part of the newstr'ed se_user */ 1657 if (cp->se_server) 1658 free(cp->se_server); 1659 for (i = 0; i < MAXARGV; i++) 1660 if (cp->se_argv[i]) 1661 free(cp->se_argv[i]); 1662#ifdef IPSEC 1663 if (cp->se_policy) 1664 free(cp->se_policy); 1665#endif 1666} 1667 1668 1669/* 1670 * Safe skip - if skip returns null, log a syntax error in the 1671 * configuration file and exit. 1672 */ 1673char * 1674sskip(cpp) 1675 char **cpp; 1676{ 1677 char *cp; 1678 1679 cp = skip(cpp); 1680 if (cp == NULL) { 1681 syslog(LOG_ERR, "%s: syntax error", CONFIG); 1682 exit(-1); 1683 } 1684 return (cp); 1685} 1686 1687char * 1688skip(cpp) 1689 char **cpp; 1690{ 1691 char *cp = *cpp; 1692 char *start; 1693 1694 if (*cpp == NULL) 1695 return ((char *)0); 1696 1697again: 1698 while (*cp == ' ' || *cp == '\t') 1699 cp++; 1700 if (*cp == '\0') { 1701 int c; 1702 1703 c = getc(fconfig); 1704 (void) ungetc(c, fconfig); 1705 if (c == ' ' || c == '\t') 1706 if ((cp = nextline(fconfig))) 1707 goto again; 1708 *cpp = (char *)0; 1709 return ((char *)0); 1710 } 1711 start = cp; 1712 while (*cp && *cp != ' ' && *cp != '\t') 1713 cp++; 1714 if (*cp != '\0') 1715 *cp++ = '\0'; 1716 *cpp = cp; 1717 return (start); 1718} 1719 1720char * 1721nextline(fd) 1722 FILE *fd; 1723{ 1724 char *cp; 1725 1726 if (fgets(line, sizeof (line), fd) == NULL) 1727 return ((char *)0); 1728 cp = strchr(line, '\n'); 1729 if (cp) 1730 *cp = '\0'; 1731 return (line); 1732} 1733 1734char * 1735newstr(cp) 1736 char *cp; 1737{ 1738 if ((cp = strdup(cp ? cp : ""))) 1739 return (cp); 1740 syslog(LOG_ERR, "strdup: %m"); 1741 exit(-1); 1742} 1743 1744void 1745inetd_setproctitle(a, s) 1746 char *a; 1747 int s; 1748{ 1749 int size; 1750 char *cp; 1751 struct sockaddr_storage ss; 1752 char buf[80]; 1753 char hbuf[NI_MAXHOST]; 1754 1755 cp = Argv[0]; 1756 size = sizeof(ss); 1757 if (getpeername(s, (struct sockaddr *)&ss, &size) == 0) { 1758 if (getnameinfo((struct sockaddr *)&ss, ss.ss_len, 1759 hbuf, sizeof(hbuf), NULL, 0, niflags) != 0) 1760 strcpy(hbuf, "?"); 1761 (void)snprintf(buf, sizeof buf, "-%s [%s]", a, hbuf); 1762 } else 1763 (void)snprintf(buf, sizeof buf, "-%s", a); 1764 strncpy(cp, buf, LastArg - cp); 1765 cp += strlen(cp); 1766 while (cp < LastArg) 1767 *cp++ = ' '; 1768} 1769 1770void 1771bump_nofile() 1772{ 1773#ifdef RLIMIT_NOFILE 1774 1775#define FD_CHUNK 32 1776 1777 struct rlimit rl; 1778 1779 if (getrlimit(RLIMIT_NOFILE, &rl) < 0) { 1780 syslog(LOG_ERR, "getrlimit: %m"); 1781 return; 1782 } 1783 rl.rlim_cur = MIN(rl.rlim_max, rl.rlim_cur + FD_CHUNK); 1784 if (rl.rlim_cur <= rlim_ofile_cur) { 1785 syslog(LOG_ERR, 1786 "bump_nofile: cannot extend file limit, max = %d", 1787 (int)rl.rlim_cur); 1788 return; 1789 } 1790 1791 if (setrlimit(RLIMIT_NOFILE, &rl) < 0) { 1792 syslog(LOG_ERR, "setrlimit: %m"); 1793 return; 1794 } 1795 1796 rlim_ofile_cur = rl.rlim_cur; 1797 return; 1798 1799#else 1800 syslog(LOG_ERR, "bump_nofile: cannot extend file limit"); 1801 return; 1802#endif 1803} 1804 1805/* 1806 * Internet services provided internally by inetd: 1807 */ 1808#define BUFSIZE 4096 1809 1810/* ARGSUSED */ 1811void 1812echo_stream(s, sep) /* Echo service -- echo data back */ 1813 int s; 1814 struct servtab *sep; 1815{ 1816 char buffer[BUFSIZE]; 1817 int i; 1818 1819 inetd_setproctitle(sep->se_service, s); 1820 while ((i = read(s, buffer, sizeof(buffer))) > 0 && 1821 write(s, buffer, i) > 0) 1822 ; 1823} 1824 1825/* ARGSUSED */ 1826void 1827echo_dg(s, sep) /* Echo service -- echo data back */ 1828 int s; 1829 struct servtab *sep; 1830{ 1831 char buffer[BUFSIZE]; 1832 int i, size; 1833 struct sockaddr_storage ss; 1834 struct sockaddr *sa; 1835 1836 sa = (struct sockaddr *)&ss; 1837 size = sizeof(ss); 1838 if ((i = recvfrom(s, buffer, sizeof(buffer), 0, sa, &size)) < 0) 1839 return; 1840 if (port_good_dg(sa)) 1841 (void) sendto(s, buffer, i, 0, sa, size); 1842} 1843 1844/* ARGSUSED */ 1845void 1846discard_stream(s, sep) /* Discard service -- ignore data */ 1847 int s; 1848 struct servtab *sep; 1849{ 1850 char buffer[BUFSIZE]; 1851 1852 inetd_setproctitle(sep->se_service, s); 1853 while ((errno = 0, read(s, buffer, sizeof(buffer)) > 0) || 1854 errno == EINTR) 1855 ; 1856} 1857 1858/* ARGSUSED */ 1859void 1860discard_dg(s, sep) /* Discard service -- ignore data */ 1861 int s; 1862 struct servtab *sep; 1863{ 1864 char buffer[BUFSIZE]; 1865 1866 (void) read(s, buffer, sizeof(buffer)); 1867} 1868 1869#include <ctype.h> 1870#define LINESIZ 72 1871char ring[128]; 1872char *endring; 1873 1874void 1875initring() 1876{ 1877 int i; 1878 1879 endring = ring; 1880 1881 for (i = 0; i <= 128; ++i) 1882 if (isprint(i)) 1883 *endring++ = i; 1884} 1885 1886/* ARGSUSED */ 1887void 1888chargen_stream(s, sep) /* Character generator */ 1889 int s; 1890 struct servtab *sep; 1891{ 1892 int len; 1893 char *rs, text[LINESIZ+2]; 1894 1895 inetd_setproctitle(sep->se_service, s); 1896 1897 if (!endring) { 1898 initring(); 1899 rs = ring; 1900 } 1901 1902 text[LINESIZ] = '\r'; 1903 text[LINESIZ + 1] = '\n'; 1904 for (rs = ring;;) { 1905 if ((len = endring - rs) >= LINESIZ) 1906 memmove(text, rs, LINESIZ); 1907 else { 1908 memmove(text, rs, len); 1909 memmove(text + len, ring, LINESIZ - len); 1910 } 1911 if (++rs == endring) 1912 rs = ring; 1913 if (write(s, text, sizeof(text)) != sizeof(text)) 1914 break; 1915 } 1916} 1917 1918/* ARGSUSED */ 1919void 1920chargen_dg(s, sep) /* Character generator */ 1921 int s; 1922 struct servtab *sep; 1923{ 1924 struct sockaddr_storage ss; 1925 struct sockaddr *sa; 1926 static char *rs; 1927 int len, size; 1928 char text[LINESIZ+2]; 1929 1930 if (endring == 0) { 1931 initring(); 1932 rs = ring; 1933 } 1934 1935 sa = (struct sockaddr *)&ss; 1936 size = sizeof(ss); 1937 if (recvfrom(s, text, sizeof(text), 0, sa, &size) < 0) 1938 return; 1939 1940 if (!port_good_dg(sa)) 1941 return; 1942 1943 if ((len = endring - rs) >= LINESIZ) 1944 memmove(text, rs, LINESIZ); 1945 else { 1946 memmove(text, rs, len); 1947 memmove(text + len, ring, LINESIZ - len); 1948 } 1949 if (++rs == endring) 1950 rs = ring; 1951 text[LINESIZ] = '\r'; 1952 text[LINESIZ + 1] = '\n'; 1953 (void) sendto(s, text, sizeof(text), 0, sa, size); 1954} 1955 1956/* 1957 * Return a machine readable date and time, in the form of the 1958 * number of seconds since midnight, Jan 1, 1900. Since gettimeofday 1959 * returns the number of seconds since midnight, Jan 1, 1970, 1960 * we must add 2208988800 seconds to this figure to make up for 1961 * some seventy years Bell Labs was asleep. 1962 */ 1963 1964long 1965machtime() 1966{ 1967 struct timeval tv; 1968 1969 if (gettimeofday(&tv, (struct timezone *)0) < 0) { 1970 if (debug) 1971 fprintf(stderr, "Unable to get time of day\n"); 1972 return (0L); 1973 } 1974#define OFFSET ((u_long)25567 * 24*60*60) 1975 return (htonl((long)(tv.tv_sec + OFFSET))); 1976#undef OFFSET 1977} 1978 1979/* ARGSUSED */ 1980void 1981machtime_stream(s, sep) 1982 int s; 1983 struct servtab *sep; 1984{ 1985 long result; 1986 1987 result = machtime(); 1988 (void) write(s, (char *) &result, sizeof(result)); 1989} 1990 1991/* ARGSUSED */ 1992void 1993machtime_dg(s, sep) 1994 int s; 1995 struct servtab *sep; 1996{ 1997 long result; 1998 struct sockaddr_storage ss; 1999 struct sockaddr *sa; 2000 int size; 2001 2002 sa = (struct sockaddr *)&ss; 2003 size = sizeof(ss); 2004 if (recvfrom(s, (char *)&result, sizeof(result), 0, sa, &size) < 0) 2005 return; 2006 if (!port_good_dg(sa)) 2007 return; 2008 result = machtime(); 2009 (void) sendto(s, (char *) &result, sizeof(result), 0, sa, size); 2010} 2011 2012/* ARGSUSED */ 2013void 2014daytime_stream(s, sep) /* Return human-readable time of day */ 2015 int s; 2016 struct servtab *sep; 2017{ 2018 char buffer[256]; 2019 time_t clock; 2020 int len; 2021 2022 clock = time((time_t *) 0); 2023 2024 len = snprintf(buffer, sizeof buffer, "%.24s\r\n", ctime(&clock)); 2025 (void) write(s, buffer, len); 2026} 2027 2028/* ARGSUSED */ 2029void 2030daytime_dg(s, sep) /* Return human-readable time of day */ 2031 int s; 2032 struct servtab *sep; 2033{ 2034 char buffer[256]; 2035 time_t clock; 2036 struct sockaddr_storage ss; 2037 struct sockaddr *sa; 2038 int size, len; 2039 2040 clock = time((time_t *) 0); 2041 2042 sa = (struct sockaddr *)&ss; 2043 size = sizeof(ss); 2044 if (recvfrom(s, buffer, sizeof(buffer), 0, sa, &size) < 0) 2045 return; 2046 if (!port_good_dg(sa)) 2047 return; 2048 len = snprintf(buffer, sizeof buffer, "%.24s\r\n", ctime(&clock)); 2049 (void) sendto(s, buffer, len, 0, sa, size); 2050} 2051 2052/* 2053 * print_service: 2054 * Dump relevant information to stderr 2055 */ 2056void 2057print_service(action, sep) 2058 char *action; 2059 struct servtab *sep; 2060{ 2061 if (isrpcservice(sep)) 2062 fprintf(stderr, 2063 "%s: %s rpcprog=%d, rpcvers = %d/%d, proto=%s, wait:max=%d.%d, user:group=%s.%s builtin=%lx server=%s" 2064#ifdef IPSEC 2065 " policy=\"%s\"" 2066#endif 2067 "\n", 2068 action, sep->se_service, 2069 sep->se_rpcprog, sep->se_rpcversh, sep->se_rpcversl, sep->se_proto, 2070 sep->se_wait, sep->se_max, sep->se_user, sep->se_group, 2071 (long)sep->se_bi, sep->se_server 2072#ifdef IPSEC 2073 , (sep->se_policy ? sep->se_policy : "") 2074#endif 2075 ); 2076 else 2077 fprintf(stderr, 2078 "%s: %s proto=%s%s, wait:max=%d.%d, user:group=%s.%s builtin=%lx server=%s" 2079#ifdef IPSEC 2080 " policy=%s" 2081#endif 2082 "\n", 2083 action, sep->se_service, 2084 sep->se_type == FAITH_TYPE ? "faith/" : "", 2085 sep->se_proto, 2086 sep->se_wait, sep->se_max, sep->se_user, sep->se_group, 2087 (long)sep->se_bi, sep->se_server 2088#ifdef IPSEC 2089 , (sep->se_policy ? sep->se_policy : "") 2090#endif 2091 ); 2092} 2093 2094void 2095usage() 2096{ 2097 2098#ifdef LIBWRAP 2099 (void)fprintf(stderr, "usage: %s [-dl] [conf]\n", __progname); 2100#else 2101 (void)fprintf(stderr, "usage: %s [-d] [conf]\n", __progname); 2102#endif 2103 exit(1); 2104} 2105 2106 2107/* 2108 * Based on TCPMUX.C by Mark K. Lottor November 1988 2109 * sri-nic::ps:<mkl>tcpmux.c 2110 */ 2111 2112static int /* # of characters upto \r,\n or \0 */ 2113getline(fd, buf, len) 2114 int fd; 2115 char *buf; 2116 int len; 2117{ 2118 int count = 0, n; 2119 2120 do { 2121 n = read(fd, buf, len-count); 2122 if (n == 0) 2123 return (count); 2124 if (n < 0) 2125 return (-1); 2126 while (--n >= 0) { 2127 if (*buf == '\r' || *buf == '\n' || *buf == '\0') 2128 return (count); 2129 count++; 2130 buf++; 2131 } 2132 } while (count < len); 2133 return (count); 2134} 2135 2136#define MAX_SERV_LEN (256+2) /* 2 bytes for \r\n */ 2137 2138#define strwrite(fd, buf) (void) write(fd, buf, sizeof(buf)-1) 2139 2140void 2141tcpmux(ctrl, sep) 2142 int ctrl; 2143 struct servtab *sep; 2144{ 2145 char service[MAX_SERV_LEN+1]; 2146 int len; 2147 2148 /* Get requested service name */ 2149 if ((len = getline(ctrl, service, MAX_SERV_LEN)) < 0) { 2150 strwrite(ctrl, "-Error reading service name\r\n"); 2151 goto reject; 2152 } 2153 service[len] = '\0'; 2154 2155 if (debug) 2156 fprintf(stderr, "tcpmux: someone wants %s\n", service); 2157 2158 /* 2159 * Help is a required command, and lists available services, 2160 * one per line. 2161 */ 2162 if (!strcasecmp(service, "help")) { 2163 strwrite(ctrl, "+Available services:\r\n"); 2164 strwrite(ctrl, "help\r\n"); 2165 for (sep = servtab; sep; sep = sep->se_next) { 2166 if (!ISMUX(sep)) 2167 continue; 2168 (void)write(ctrl, sep->se_service, 2169 strlen(sep->se_service)); 2170 strwrite(ctrl, "\r\n"); 2171 } 2172 goto reject; 2173 } 2174 2175 /* Try matching a service in inetd.conf with the request */ 2176 for (sep = servtab; sep; sep = sep->se_next) { 2177 if (!ISMUX(sep)) 2178 continue; 2179 if (!strcasecmp(service, sep->se_service)) { 2180 if (ISMUXPLUS(sep)) 2181 strwrite(ctrl, "+Go\r\n"); 2182 run_service(ctrl, sep); 2183 return; 2184 } 2185 } 2186 strwrite(ctrl, "-Service not available\r\n"); 2187reject: 2188 _exit(1); 2189} 2190 2191 2192#ifdef MULOG 2193dolog(sep, ctrl) 2194 struct servtab *sep; 2195 int ctrl; 2196{ 2197 struct sockaddr_storage ss; 2198 struct sockaddr *sa = (struct sockaddr *)&ss; 2199 struct sockaddr_in *sin = (struct sockaddr_in *)&ss; 2200 int len = sizeof(ss); 2201 struct hostent *hp; 2202 char *host, *dp, buf[BUFSIZ], *rfc931_name(); 2203 int connected = 1; 2204 2205 switch (sep->se_family) { 2206 case AF_INET: 2207#ifdef INET6 2208 case AF_INET6: 2209#endif 2210 break; 2211 default; 2212 return; 2213 } 2214 2215 if (getpeername(ctrl, sa, &len) < 0) { 2216 if (errno != ENOTCONN) { 2217 syslog(LOG_ERR, "getpeername: %m"); 2218 return; 2219 } 2220 if (recvfrom(ctrl, buf, sizeof(buf), MSG_PEEK, sa, &len) < 0) { 2221 syslog(LOG_ERR, "recvfrom: %m"); 2222 return; 2223 } 2224 connected = 0; 2225 } 2226 switch (sa->sa_family) { 2227 case AF_INET: 2228#ifdef INET6 2229 case AF_INET6: 2230#endif 2231 break; 2232 default; 2233 syslog(LOG_ERR, "unexpected address family %u", sa->sa_family); 2234 return; 2235 } 2236 2237 if (getnameinfo(sa, sa->sa_len, buf, sizeof(buf), NULL, 0, 0) != 0) 2238 strcpy(buf, "?"); 2239 host = buf; 2240 2241 switch (sep->se_log & ~MULOG_RFC931) { 2242 case 0: 2243 return; 2244 case 1: 2245 if (curdom == NULL || *curdom == '\0') 2246 break; 2247 dp = host + strlen(host) - strlen(curdom); 2248 if (dp < host) 2249 break; 2250 if (debug) 2251 fprintf(stderr, "check \"%s\" against curdom \"%s\"\n", 2252 host, curdom); 2253 if (strcasecmp(dp, curdom) == 0) 2254 return; 2255 break; 2256 case 2: 2257 default: 2258 break; 2259 } 2260 2261 openlog("", LOG_NOWAIT, MULOG); 2262 2263 if (connected && (sep->se_log & MULOG_RFC931)) 2264 syslog(LOG_INFO, "%s@%s wants %s", 2265 rfc931_name(sa, ctrl), host, sep->se_service); 2266 else 2267 syslog(LOG_INFO, "%s wants %s", 2268 host, sep->se_service); 2269} 2270 2271/* 2272 * From tcp_log by 2273 * Wietse Venema, Eindhoven University of Technology, The Netherlands. 2274 */ 2275#if 0 2276static char sccsid[] = "@(#) rfc931.c 1.3 92/08/31 22:54:46"; 2277#endif 2278 2279#include <setjmp.h> 2280 2281#define RFC931_PORT 113 /* Semi-well-known port */ 2282#define TIMEOUT 4 2283#define TIMEOUT2 10 2284 2285static jmp_buf timebuf; 2286 2287/* timeout - handle timeouts */ 2288 2289static void timeout(sig) 2290int sig; 2291{ 2292 longjmp(timebuf, sig); 2293} 2294 2295/* rfc931_name - return remote user name */ 2296 2297char * 2298rfc931_name(there, ctrl) 2299struct sockaddr *there; /* remote link information */ 2300int ctrl; 2301{ 2302 struct sockaddr_storage here; /* local link information */ 2303 struct sockaddr_storage sin; /* for talking to RFC931 daemon */ 2304 int length; 2305 int s; 2306 unsigned remote; 2307 unsigned local; 2308 static char user[256]; /* XXX */ 2309 char buf[256]; 2310 char *cp; 2311 char *result = "USER_UNKNOWN"; 2312 int len; 2313 u_int16_t myport, hisport; 2314 2315 /* Find out local port number of our stdin. */ 2316 2317 length = sizeof(here); 2318 if (getsockname(ctrl, (struct sockaddr *) &here, &length) == -1) { 2319 syslog(LOG_ERR, "getsockname: %m"); 2320 return (result); 2321 } 2322 switch (here.ss_family) { 2323 case AF_INET: 2324 myport = ((struct sockaddr_in *)&here)->sin_port; 2325 break; 2326#ifdef INET6 2327 case AF_INET6: 2328 myport = ((struct sockaddr_in6 *)&here)->sin6_port; 2329 break; 2330#endif 2331 } 2332 switch (there->sa_family) { 2333 case AF_INET: 2334 hisport = ((struct sockaddr_in *)sa)->sin_port; 2335 break; 2336#ifdef INET6 2337 case AF_INET6: 2338 hisport = ((struct sockaddr_in6 *)sa)->sin6_port; 2339 break; 2340#endif 2341 } 2342 /* Set up timer so we won't get stuck. */ 2343 2344 if ((s = socket(here.ss_family, SOCK_STREAM, 0)) == -1) { 2345 syslog(LOG_ERR, "socket: %m"); 2346 return (result); 2347 } 2348 2349 sin = here; 2350 switch (sin.ss_family) { 2351 case AF_INET: 2352 ((struct sockaddr_in *)&sin)->sin_port = htons(0); 2353 break; 2354#ifdef INET6 2355 case AF_INET6: 2356 ((struct sockaddr_in6 *)&sin)->sin6_port = htons(0); 2357 break; 2358#endif 2359 } 2360 if (bind(s, (struct sockaddr *) &sin, sin.ss_len) == -1) { 2361 syslog(LOG_ERR, "bind: %m"); 2362 return (result); 2363 } 2364 2365 signal(SIGALRM, timeout); 2366 if (setjmp(timebuf)) { 2367 close(s); /* not: fclose(fp) */ 2368 return (result); 2369 } 2370 alarm(TIMEOUT); 2371 2372 /* Connect to the RFC931 daemon. */ 2373 2374 memcpy(&sin, there, there->sa_len); 2375 switch (sin.ss_family) { 2376 case AF_INET: 2377 ((struct sockaddr_in *)&sin)->sin_port = htons(RFC931_PORT); 2378 break; 2379#ifdef INET6 2380 case AF_INET6: 2381 ((struct sockaddr_in6 *)&sin)->sin6_port = htons(RFC931_PORT); 2382 break; 2383#endif 2384 } 2385 if (connect(s, (struct sockaddr *) &sin, sin.ss_len) == -1) { 2386 close(s); 2387 alarm(0); 2388 return (result); 2389 } 2390 2391 /* Query the RFC 931 server. Would 13-byte writes ever be broken up? */ 2392 (void)snprintf(buf, sizeof buf, "%u,%u\r\n", ntohs(hisport), 2393 ntohs(myport)); 2394 2395 2396 for (len = 0, cp = buf; len < strlen(buf); ) { 2397 int n; 2398 2399 if ((n = write(s, cp, strlen(buf) - len)) == -1) { 2400 close(s); 2401 alarm(0); 2402 return (result); 2403 } 2404 cp += n; 2405 len += n; 2406 } 2407 2408 /* Read response */ 2409 for (cp = buf; cp < buf + sizeof(buf) - 1; ) { 2410 char c; 2411 if (read(s, &c, 1) != 1) { 2412 close(s); 2413 alarm(0); 2414 return (result); 2415 } 2416 if (c == '\n') 2417 break; 2418 *cp++ = c; 2419 } 2420 *cp = '\0'; 2421 2422 if (sscanf(buf, "%u , %u : USERID :%*[^:]:%255s", &remote, &local, user) == 3 2423 && ntohs(hisport) == remote 2424 && ntohs(myport) == local) { 2425 2426 /* Strip trailing carriage return. */ 2427 if (cp = strchr(user, '\r')) 2428 *cp = 0; 2429 result = user; 2430 } 2431 2432 alarm(0); 2433 close(s); 2434 return (result); 2435} 2436#endif 2437 2438/* 2439 * check if the port where send data to is one of the obvious ports 2440 * that are used for denial of service attacks like two echo ports 2441 * just echoing data between them 2442 */ 2443int 2444port_good_dg(sa) 2445 struct sockaddr *sa; 2446{ 2447 u_int16_t port; 2448 int i, bad; 2449 char hbuf[NI_MAXHOST]; 2450 2451 bad = 0; 2452 2453 switch (sa->sa_family) { 2454 case AF_INET: 2455 port = ntohs(((struct sockaddr_in *)sa)->sin_port); 2456 break; 2457#ifdef INET6 2458 case AF_INET6: 2459 port = ntohs(((struct sockaddr_in6 *)sa)->sin6_port); 2460 break; 2461#endif 2462 default: 2463 /* XXX unsupported af, is it safe to assume it to be safe? */ 2464 return 1; 2465 } 2466 2467 for (i = 0; bad_ports[i] != 0; i++) 2468 if (port == bad_ports[i]) { 2469 bad = 1; 2470 break; 2471 } 2472 2473 if (bad) { 2474 if (getnameinfo(sa, sa->sa_len, hbuf, sizeof(hbuf), 2475 NULL, 0, niflags) != 0) 2476 strcpy(hbuf, "?"); 2477 syslog(LOG_WARNING,"Possible DoS attack from %s, Port %d", 2478 hbuf, port); 2479 return (0); 2480 } else 2481 return (1); 2482} 2483 2484