inetd.c revision 1.86
1/* $NetBSD: inetd.c,v 1.86 2003/02/12 10:03:47 tron 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 1.86 2003/02/12 10:03:47 tron 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#include <sys/event.h> 206 207#ifndef RLIMIT_NOFILE 208#define RLIMIT_NOFILE RLIMIT_OFILE 209#endif 210 211#ifndef NO_RPC 212#define RPC 213#endif 214 215#include <net/if.h> 216 217#include <netinet/in.h> 218#include <arpa/inet.h> 219#ifdef RPC 220#include <rpc/rpc.h> 221#include <rpc/rpcb_clnt.h> 222#include <netconfig.h> 223#endif 224 225#include <ctype.h> 226#include <errno.h> 227#include <fcntl.h> 228#include <grp.h> 229#include <netdb.h> 230#include <pwd.h> 231#include <signal.h> 232#include <stdio.h> 233#include <stdlib.h> 234#include <string.h> 235#include <syslog.h> 236#include <unistd.h> 237#include <util.h> 238#include <ifaddrs.h> 239 240#include "pathnames.h" 241 242#ifdef IPSEC 243#include <netinet6/ipsec.h> 244#ifndef IPSEC_POLICY_IPSEC /* no ipsec support on old ipsec */ 245#undef IPSEC 246#endif 247#include "ipsec.h" 248#endif 249 250#ifdef LIBWRAP 251# include <tcpd.h> 252#ifndef LIBWRAP_ALLOW_FACILITY 253# define LIBWRAP_ALLOW_FACILITY LOG_AUTH 254#endif 255#ifndef LIBWRAP_ALLOW_SEVERITY 256# define LIBWRAP_ALLOW_SEVERITY LOG_INFO 257#endif 258#ifndef LIBWRAP_DENY_FACILITY 259# define LIBWRAP_DENY_FACILITY LOG_AUTH 260#endif 261#ifndef LIBWRAP_DENY_SEVERITY 262# define LIBWRAP_DENY_SEVERITY LOG_WARNING 263#endif 264int allow_severity = LIBWRAP_ALLOW_FACILITY|LIBWRAP_ALLOW_SEVERITY; 265int deny_severity = LIBWRAP_DENY_FACILITY|LIBWRAP_DENY_SEVERITY; 266#endif 267 268#define TOOMANY 40 /* don't start more than TOOMANY */ 269#define CNT_INTVL 60 /* servers in CNT_INTVL sec. */ 270#define RETRYTIME (60*10) /* retry after bind or server fail */ 271 272#define SIGBLOCK (sigmask(SIGCHLD)|sigmask(SIGHUP)|sigmask(SIGALRM)) 273 274int debug; 275#ifdef LIBWRAP 276int lflag; 277#endif 278int nsock, maxsock; 279int kq; 280int options; 281int timingout; 282struct servent *sp; 283char *curdom; 284const int niflags = NI_NUMERICHOST | NI_NUMERICSERV; 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) 292rlim_t 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(int, struct servtab *); 353void chargen_stream(int, struct servtab *); 354void close_sep(struct servtab *); 355void config(int); 356void daytime_dg(int, struct servtab *); 357void daytime_stream(int, struct servtab *); 358void discard_dg(int, struct servtab *); 359void discard_stream(int, struct servtab *); 360void echo_dg(int, struct servtab *); 361void echo_stream(int, struct servtab *); 362void endconfig(void); 363struct servtab *enter(struct servtab *); 364void freeconfig(struct servtab *); 365struct servtab *getconfigent(void); 366void goaway(int); 367void machtime_dg(int, struct servtab *); 368void machtime_stream(int, struct servtab *); 369char *newstr(char *); 370char *nextline(FILE *); 371void print_service(char *, struct servtab *); 372void reapchild(int); 373void retry(int); 374void run_service(int, struct servtab *); 375int setconfig(void); 376void setup(struct servtab *); 377char *sskip(char **); 378char *skip(char **); 379void tcpmux(int, struct servtab *); 380void usage(void); 381void register_rpc(struct servtab *); 382void unregister_rpc(struct servtab *); 383void bump_nofile(void); 384void inetd_setproctitle(char *, int); 385void initring(void); 386uint32_t machtime(void); 387int port_good_dg(struct sockaddr *); 388int dg_broadcast(struct in_addr *); 389static int my_kevent(const struct kevent *, size_t, struct kevent *, 390 size_t); 391static int getline(int, char *, int); 392int main(int, char *[]); 393void spawn(struct servtab *, int); 394#ifdef MULOG 395void dolog(struct servtab *, int); 396static void timeout(int); 397char *rfc931_name(struct sockaddr *, int); 398#endif 399 400struct biltin { 401 char *bi_service; /* internally provided service name */ 402 int bi_socktype; /* type of socket supported */ 403 short bi_fork; /* 1 if should fork before call */ 404 short bi_wait; /* 1 if should wait for child */ 405 void (*bi_fn)(int, struct servtab *); 406 /* function which performs it */ 407} biltins[] = { 408 /* Echo received data */ 409 { "echo", SOCK_STREAM, 1, 0, echo_stream }, 410 { "echo", SOCK_DGRAM, 0, 0, echo_dg }, 411 412 /* Internet /dev/null */ 413 { "discard", SOCK_STREAM, 1, 0, discard_stream }, 414 { "discard", SOCK_DGRAM, 0, 0, discard_dg }, 415 416 /* Return 32 bit time since 1970 */ 417 { "time", SOCK_STREAM, 0, 0, machtime_stream }, 418 { "time", SOCK_DGRAM, 0, 0, machtime_dg }, 419 420 /* Return human-readable time */ 421 { "daytime", SOCK_STREAM, 0, 0, daytime_stream }, 422 { "daytime", SOCK_DGRAM, 0, 0, daytime_dg }, 423 424 /* Familiar character generator */ 425 { "chargen", SOCK_STREAM, 1, 0, chargen_stream }, 426 { "chargen", SOCK_DGRAM, 0, 0, chargen_dg }, 427 428 { "tcpmux", SOCK_STREAM, 1, 0, tcpmux }, 429 430 { NULL } 431}; 432 433/* list of "bad" ports. I.e. ports that are most obviously used for 434 * "cycling packets" denial of service attacks. See /etc/services. 435 * List must end with port number "0". 436 */ 437 438u_int16_t bad_ports[] = { 7, 9, 13, 19, 37, 0 }; 439 440 441#define NUMINT (sizeof(intab) / sizeof(struct inent)) 442char *CONFIG = _PATH_INETDCONF; 443 444int 445main(argc, argv) 446 int argc; 447 char *argv[]; 448{ 449 struct servtab *sep; 450 struct sigvec sv; 451 int ch; 452 453 while ((ch = getopt(argc, argv, 454#ifdef LIBWRAP 455 "dl" 456#else 457 "d" 458#endif 459 )) != -1) 460 switch(ch) { 461 case 'd': 462 debug = 1; 463 options |= SO_DEBUG; 464 break; 465#ifdef LIBWRAP 466 case 'l': 467 lflag = 1; 468 break; 469#endif 470 case '?': 471 default: 472 usage(); 473 } 474 argc -= optind; 475 argv += optind; 476 477 if (argc > 0) 478 CONFIG = argv[0]; 479 480 if (debug == 0) 481 daemon(0, 0); 482 openlog("inetd", LOG_PID | LOG_NOWAIT, LOG_DAEMON); 483 pidfile(NULL); 484 485 kq = kqueue(); 486 if (kq < 0) { 487 syslog(LOG_ERR, "kqueue: %m"); 488 return (EXIT_FAILURE); 489 } 490 491#ifdef RLIMIT_NOFILE 492 if (getrlimit(RLIMIT_NOFILE, &rlim_ofile) < 0) { 493 syslog(LOG_ERR, "getrlimit: %m"); 494 } else { 495 rlim_ofile_cur = rlim_ofile.rlim_cur; 496 if (rlim_ofile_cur == RLIM_INFINITY) /* ! */ 497 rlim_ofile_cur = OPEN_MAX; 498 } 499#endif 500 501 memset(&sv, 0, sizeof(sv)); 502 sv.sv_mask = SIGBLOCK; 503 sv.sv_handler = retry; 504 sigvec(SIGALRM, &sv, NULL); 505 config(SIGHUP); 506 sv.sv_handler = config; 507 sigvec(SIGHUP, &sv, NULL); 508 sv.sv_handler = reapchild; 509 sigvec(SIGCHLD, &sv, NULL); 510 sv.sv_handler = goaway; 511 sigvec(SIGTERM, &sv, NULL); 512 sv.sv_handler = goaway; 513 sigvec(SIGINT, &sv, NULL); 514 sv.sv_mask = 0L; 515 sv.sv_handler = SIG_IGN; 516 sigvec(SIGPIPE, &sv, NULL); 517 518 for (;;) { 519 int n, ctrl; 520 struct kevent ev[256], *evp; 521 522 if (nsock == 0) { 523 (void) sigblock(SIGBLOCK); 524 while (nsock == 0) 525 sigpause(0L); 526 (void) sigsetmask(0L); 527 } 528 n = my_kevent(NULL, 0, ev, sizeof(ev) / sizeof(ev[0])); 529 for (evp = ev; n > 0; evp++, n--) { 530 if (evp->filter != EVFILT_READ) 531 continue; 532 sep = (struct servtab *)evp->udata; 533 /* Paranoia */ 534 if (sep->se_fd != evp->ident) 535 continue; 536 if (debug) 537 fprintf(stderr, "someone wants %s\n", sep->se_service); 538 if (!sep->se_wait && sep->se_socktype == SOCK_STREAM) { 539 /* XXX here do the libwrap check-before-accept */ 540 ctrl = accept(sep->se_fd, NULL, NULL); 541 if (debug) 542 fprintf(stderr, "accept, ctrl %d\n", 543 ctrl); 544 if (ctrl < 0) { 545 if (errno != EINTR) 546 syslog(LOG_WARNING, 547 "accept (for %s): %m", 548 sep->se_service); 549 continue; 550 } 551 } else 552 ctrl = sep->se_fd; 553 (void) sigblock(SIGBLOCK); 554 spawn(sep, ctrl); 555 } 556 } 557} 558 559void 560spawn(sep, ctrl) 561 struct servtab *sep; 562 int ctrl; 563{ 564 int dofork; 565 pid_t pid; 566 struct sigvec sv; 567 568 pid = 0; 569#ifdef LIBWRAP_INTERNAL 570 dofork = 1; 571#else 572 dofork = (sep->se_bi == 0 || sep->se_bi->bi_fork); 573#endif 574 if (dofork) { 575 if (sep->se_count++ == 0) 576 (void)gettimeofday(&sep->se_time, NULL); 577 else if (sep->se_count >= sep->se_max) { 578 struct timeval now; 579 580 (void)gettimeofday(&now, NULL); 581 if (now.tv_sec - sep->se_time.tv_sec > 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 == 589 SOCK_STREAM) 590 close(ctrl); 591 close_sep(sep); 592 sigsetmask(0L); 593 if (!timingout) { 594 timingout = 1; 595 alarm(RETRYTIME); 596 } 597 return; 598 } 599 } 600 pid = fork(); 601 if (pid < 0) { 602 syslog(LOG_ERR, "fork: %m"); 603 if (!sep->se_wait && sep->se_socktype == SOCK_STREAM) 604 close(ctrl); 605 sigsetmask(0L); 606 sleep(1); 607 return; 608 } 609 if (pid != 0 && sep->se_wait) { 610 struct kevent ev; 611 612 sep->se_wait = pid; 613 EV_SET(&ev, sep->se_fd, EVFILT_READ, 614 EV_DELETE, 0, 0, 0); 615 (void) my_kevent(&ev, 1, NULL, 0); 616 nsock--; 617 } 618 if (pid == 0) { 619 memset(&sv, 0, sizeof(sv)); 620 sv.sv_mask = 0L; 621 sv.sv_handler = SIG_DFL; 622 sigvec(SIGPIPE, &sv, NULL); 623 if (debug) 624 setsid(); 625 } 626 } 627 sigsetmask(0L); 628 if (pid == 0) { 629 run_service(ctrl, sep); 630 if (dofork) 631 exit(0); 632 } 633 if (!sep->se_wait && sep->se_socktype == SOCK_STREAM) 634 close(ctrl); 635} 636 637void 638run_service(ctrl, sep) 639 int ctrl; 640 struct servtab *sep; 641{ 642 struct passwd *pwd; 643 struct group *grp = NULL; /* XXX gcc */ 644 char buf[NI_MAXSERV]; 645#ifdef LIBWRAP 646 struct request_info req; 647 int denied; 648 char *service = NULL; /* XXX gcc */ 649#endif 650 651#ifdef LIBWRAP 652#ifndef LIBWRAP_INTERNAL 653 if (sep->se_bi == 0) 654#endif 655 if (!sep->se_wait && sep->se_socktype == SOCK_STREAM) { 656 request_init(&req, RQ_DAEMON, sep->se_argv[0] ? 657 sep->se_argv[0] : sep->se_service, RQ_FILE, ctrl, NULL); 658 fromhost(&req); 659 denied = !hosts_access(&req); 660 if (denied || lflag) { 661 if (getnameinfo(&sep->se_ctrladdr, 662 sep->se_ctrladdr.sa_len, NULL, 0, 663 buf, sizeof(buf), 0) != 0) { 664 /* shouldn't happen */ 665 (void)snprintf(buf, sizeof buf, "%d", 666 ntohs(sep->se_ctrladdr_in.sin_port)); 667 } 668 service = buf; 669 } 670 if (denied) { 671 syslog(deny_severity, 672 "refused connection from %.500s, service %s (%s)", 673 eval_client(&req), service, sep->se_proto); 674 goto reject; 675 } 676 if (lflag) { 677 syslog(allow_severity, 678 "connection from %.500s, service %s (%s)", 679 eval_client(&req), service, sep->se_proto); 680 } 681 } 682#endif /* LIBWRAP */ 683 684 if (sep->se_bi) { 685 (*sep->se_bi->bi_fn)(ctrl, sep); 686 } else { 687 if ((pwd = getpwnam(sep->se_user)) == NULL) { 688 syslog(LOG_ERR, "%s/%s: %s: No such user", 689 sep->se_service, sep->se_proto, sep->se_user); 690 goto reject; 691 } 692 if (sep->se_group && 693 (grp = getgrnam(sep->se_group)) == NULL) { 694 syslog(LOG_ERR, "%s/%s: %s: No such group", 695 sep->se_service, sep->se_proto, sep->se_group); 696 goto reject; 697 } 698 if (pwd->pw_uid) { 699 if (sep->se_group) 700 pwd->pw_gid = grp->gr_gid; 701 if (setgid(pwd->pw_gid) < 0) { 702 syslog(LOG_ERR, 703 "%s/%s: can't set gid %d: %m", sep->se_service, 704 sep->se_proto, pwd->pw_gid); 705 goto reject; 706 } 707 (void) initgroups(pwd->pw_name, 708 pwd->pw_gid); 709 if (setuid(pwd->pw_uid) < 0) { 710 syslog(LOG_ERR, 711 "%s/%s: can't set uid %d: %m", sep->se_service, 712 sep->se_proto, pwd->pw_uid); 713 goto reject; 714 } 715 } else if (sep->se_group) { 716 (void) setgid((gid_t)grp->gr_gid); 717 } 718 if (debug) 719 fprintf(stderr, "%d execl %s\n", 720 getpid(), sep->se_server); 721#ifdef MULOG 722 if (sep->se_log) 723 dolog(sep, ctrl); 724#endif 725 /* Set our control descriptor to not close-on-exec... */ 726 if (fcntl(ctrl, F_SETFD, 0) < 0) 727 syslog(LOG_ERR, "fcntl (F_SETFD, 0): %m"); 728 /* ...and dup it to stdin, stdout, and stderr. */ 729 if (ctrl != 0) { 730 dup2(ctrl, 0); 731 close(ctrl); 732 ctrl = 0; 733 } 734 dup2(0, 1); 735 dup2(0, 2); 736#ifdef RLIMIT_NOFILE 737 if (rlim_ofile.rlim_cur != rlim_ofile_cur && 738 setrlimit(RLIMIT_NOFILE, &rlim_ofile) < 0) 739 syslog(LOG_ERR, "setrlimit: %m"); 740#endif 741 execv(sep->se_server, sep->se_argv); 742 syslog(LOG_ERR, "cannot execute %s: %m", sep->se_server); 743 reject: 744 if (sep->se_socktype != SOCK_STREAM) 745 recv(ctrl, buf, sizeof (buf), 0); 746 _exit(1); 747 } 748} 749 750void 751reapchild(signo) 752 int signo; 753{ 754 int status; 755 pid_t pid; 756 struct servtab *sep; 757 758 for (;;) { 759 pid = wait3(&status, WNOHANG, NULL); 760 if (pid <= 0) 761 break; 762 if (debug) 763 fprintf(stderr, "%d reaped, status %#x\n", 764 pid, status); 765 for (sep = servtab; sep != NULL; sep = sep->se_next) 766 if (sep->se_wait == pid) { 767 struct kevent ev; 768 769 if (WIFEXITED(status) && WEXITSTATUS(status)) 770 syslog(LOG_WARNING, 771 "%s: exit status 0x%x", 772 sep->se_server, WEXITSTATUS(status)); 773 else if (WIFSIGNALED(status)) 774 syslog(LOG_WARNING, 775 "%s: exit signal 0x%x", 776 sep->se_server, WTERMSIG(status)); 777 sep->se_wait = 1; 778 EV_SET(&ev, sep->se_fd, EVFILT_READ, 779 EV_ADD | EV_ENABLE, 0, 0, (intptr_t)sep); 780 (void) my_kevent(&ev, 1, NULL, 0); 781 nsock++; 782 if (debug) 783 fprintf(stderr, "restored %s, fd %d\n", 784 sep->se_service, sep->se_fd); 785 } 786 } 787} 788 789void 790config(signo) 791 int signo; 792{ 793 struct servtab *sep, *cp, **sepp; 794 long omask; 795 int n; 796 797 if (!setconfig()) { 798 syslog(LOG_ERR, "%s: %m", CONFIG); 799 return; 800 } 801 for (sep = servtab; sep != NULL; sep = sep->se_next) 802 sep->se_checked = 0; 803 while ((cp = getconfigent())) { 804 for (sep = servtab; sep != NULL; sep = sep->se_next) 805 if (strcmp(sep->se_service, cp->se_service) == 0 && 806 strcmp(sep->se_hostaddr, cp->se_hostaddr) == 0 && 807 strcmp(sep->se_proto, cp->se_proto) == 0 && 808 ISMUX(sep) == ISMUX(cp)) 809 break; 810 if (sep != 0) { 811 int i; 812 813#define SWAP(type, a, b) {type c=(type)a; (type)a=(type)b; (type)b=(type)c;} 814 815 omask = sigblock(SIGBLOCK); 816 /* 817 * sep->se_wait may be holding the pid of a daemon 818 * that we're waiting for. If so, don't overwrite 819 * it unless the config file explicitly says don't 820 * wait. 821 */ 822 if (cp->se_bi == 0 && 823 (sep->se_wait == 1 || cp->se_wait == 0)) 824 sep->se_wait = cp->se_wait; 825 SWAP(char *, sep->se_user, cp->se_user); 826 SWAP(char *, sep->se_group, cp->se_group); 827 SWAP(char *, sep->se_server, cp->se_server); 828 for (i = 0; i < MAXARGV; i++) 829 SWAP(char *, sep->se_argv[i], cp->se_argv[i]); 830#ifdef IPSEC 831 SWAP(char *, sep->se_policy, cp->se_policy); 832#endif 833 SWAP(int, cp->se_type, sep->se_type); 834 SWAP(int, cp->se_max, sep->se_max); 835#undef SWAP 836 if (isrpcservice(sep)) 837 unregister_rpc(sep); 838 sep->se_rpcversl = cp->se_rpcversl; 839 sep->se_rpcversh = cp->se_rpcversh; 840 sigsetmask(omask); 841 freeconfig(cp); 842 if (debug) 843 print_service("REDO", sep); 844 } else { 845 sep = enter(cp); 846 if (debug) 847 print_service("ADD ", sep); 848 } 849 sep->se_checked = 1; 850 851 switch (sep->se_family) { 852 case AF_LOCAL: 853 if (sep->se_fd != -1) 854 break; 855 n = strlen(sep->se_service); 856 if (n > sizeof(sep->se_ctrladdr_un.sun_path)) { 857 syslog(LOG_ERR, "%s: address too long", 858 sep->se_service); 859 sep->se_checked = 0; 860 continue; 861 } 862 (void)unlink(sep->se_service); 863 strncpy(sep->se_ctrladdr_un.sun_path, 864 sep->se_service, n); 865 sep->se_ctrladdr_un.sun_family = AF_LOCAL; 866 sep->se_ctrladdr_size = n + 867 sizeof(sep->se_ctrladdr_un) - 868 sizeof(sep->se_ctrladdr_un.sun_path); 869 if (!ISMUX(sep)) 870 setup(sep); 871 break; 872 case AF_INET: 873#ifdef INET6 874 case AF_INET6: 875#endif 876 { 877 struct addrinfo hints, *res; 878 char *host, *port; 879 int error; 880 int s; 881 882 /* check if the family is supported */ 883 s = socket(sep->se_family, SOCK_DGRAM, 0); 884 if (s < 0) { 885 syslog(LOG_WARNING, 886"%s/%s: %s: the address family is not supported by the kernel", 887 sep->se_service, sep->se_proto, 888 sep->se_hostaddr); 889 sep->se_checked = 0; 890 continue; 891 } 892 close(s); 893 894 memset(&hints, 0, sizeof(hints)); 895 hints.ai_family = sep->se_family; 896 hints.ai_socktype = sep->se_socktype; 897 hints.ai_flags = AI_PASSIVE; 898 if (!strcmp(sep->se_hostaddr, "*")) 899 host = NULL; 900 else 901 host = sep->se_hostaddr; 902 if (isrpcservice(sep) || ISMUX(sep)) 903 port = "0"; 904 else 905 port = sep->se_service; 906 error = getaddrinfo(host, port, &hints, &res); 907 if (error) { 908 if (error == EAI_SERVICE) { 909 /* gai_strerror not friendly enough */ 910 syslog(LOG_WARNING, "%s/%s: " 911 "unknown service", 912 sep->se_service, sep->se_proto); 913 } else { 914 syslog(LOG_ERR, "%s/%s: %s: %s", 915 sep->se_service, sep->se_proto, 916 sep->se_hostaddr, 917 gai_strerror(error)); 918 } 919 sep->se_checked = 0; 920 continue; 921 } 922 if (res->ai_next) { 923 syslog(LOG_ERR, 924 "%s/%s: %s: resolved to multiple addr", 925 sep->se_service, sep->se_proto, 926 sep->se_hostaddr); 927 sep->se_checked = 0; 928 freeaddrinfo(res); 929 continue; 930 } 931 memcpy(&sep->se_ctrladdr, res->ai_addr, 932 res->ai_addrlen); 933 if (ISMUX(sep)) { 934 sep->se_fd = -1; 935 freeaddrinfo(res); 936 continue; 937 } 938 sep->se_ctrladdr_size = res->ai_addrlen; 939 freeaddrinfo(res); 940#ifdef RPC 941 if (isrpcservice(sep)) { 942 struct rpcent *rp; 943 944 sep->se_rpcprog = atoi(sep->se_service); 945 if (sep->se_rpcprog == 0) { 946 rp = getrpcbyname(sep->se_service); 947 if (rp == 0) { 948 syslog(LOG_ERR, 949 "%s/%s: unknown service", 950 sep->se_service, 951 sep->se_proto); 952 sep->se_checked = 0; 953 continue; 954 } 955 sep->se_rpcprog = rp->r_number; 956 } 957 if (sep->se_fd == -1 && !ISMUX(sep)) 958 setup(sep); 959 if (sep->se_fd != -1) 960 register_rpc(sep); 961 } else 962#endif 963 { 964 if (sep->se_fd >= 0) 965 close_sep(sep); 966 if (sep->se_fd == -1 && !ISMUX(sep)) 967 setup(sep); 968 } 969 } 970 } 971 } 972 endconfig(); 973 /* 974 * Purge anything not looked at above. 975 */ 976 omask = sigblock(SIGBLOCK); 977 sepp = &servtab; 978 while ((sep = *sepp)) { 979 if (sep->se_checked) { 980 sepp = &sep->se_next; 981 continue; 982 } 983 *sepp = sep->se_next; 984 if (sep->se_fd >= 0) 985 close_sep(sep); 986 if (isrpcservice(sep)) 987 unregister_rpc(sep); 988 if (sep->se_family == AF_LOCAL) 989 (void)unlink(sep->se_service); 990 if (debug) 991 print_service("FREE", sep); 992 freeconfig(sep); 993 free((char *)sep); 994 } 995 (void) sigsetmask(omask); 996} 997 998void 999retry(signo) 1000 int signo; 1001{ 1002 struct servtab *sep; 1003 1004 timingout = 0; 1005 for (sep = servtab; sep != NULL; sep = sep->se_next) { 1006 if (sep->se_fd == -1 && !ISMUX(sep)) { 1007 switch (sep->se_family) { 1008 case AF_LOCAL: 1009 case AF_INET: 1010#ifdef INET6 1011 case AF_INET6: 1012#endif 1013 setup(sep); 1014 if (sep->se_fd != -1 && isrpcservice(sep)) 1015 register_rpc(sep); 1016 break; 1017 } 1018 } 1019 } 1020} 1021 1022void 1023goaway(signo) 1024 int signo; 1025{ 1026 struct servtab *sep; 1027 1028 for (sep = servtab; sep != NULL; sep = sep->se_next) { 1029 if (sep->se_fd == -1) 1030 continue; 1031 1032 switch (sep->se_family) { 1033 case AF_LOCAL: 1034 (void)unlink(sep->se_service); 1035 break; 1036 case AF_INET: 1037#ifdef INET6 1038 case AF_INET6: 1039#endif 1040 if (sep->se_wait == 1 && isrpcservice(sep)) 1041 unregister_rpc(sep); 1042 break; 1043 } 1044 (void)close(sep->se_fd); 1045 } 1046 exit(0); 1047} 1048 1049void 1050setup(sep) 1051 struct servtab *sep; 1052{ 1053 int on = 1; 1054 struct kevent ev; 1055 1056 if ((sep->se_fd = socket(sep->se_family, sep->se_socktype, 0)) < 0) { 1057 if (debug) 1058 fprintf(stderr, "socket failed on %s/%s: %s\n", 1059 sep->se_service, sep->se_proto, strerror(errno)); 1060 syslog(LOG_ERR, "%s/%s: socket: %m", 1061 sep->se_service, sep->se_proto); 1062 return; 1063 } 1064 /* Set all listening sockets to close-on-exec. */ 1065 if (fcntl(sep->se_fd, F_SETFD, FD_CLOEXEC) < 0) { 1066 syslog(LOG_ERR, "%s/%s: fcntl(F_SETFD, FD_CLOEXEC): %m", 1067 sep->se_service, sep->se_proto); 1068 close(sep->se_fd); 1069 return; 1070 } 1071 1072#define turnon(fd, opt) \ 1073setsockopt(fd, SOL_SOCKET, opt, (char *)&on, sizeof (on)) 1074 if (strcmp(sep->se_proto, "tcp") == 0 && (options & SO_DEBUG) && 1075 turnon(sep->se_fd, SO_DEBUG) < 0) 1076 syslog(LOG_ERR, "setsockopt (SO_DEBUG): %m"); 1077 if (turnon(sep->se_fd, SO_REUSEADDR) < 0) 1078 syslog(LOG_ERR, "setsockopt (SO_REUSEADDR): %m"); 1079#undef turnon 1080 1081 /* Set the socket buffer sizes, if specified. */ 1082 if (sep->se_sndbuf != 0 && setsockopt(sep->se_fd, SOL_SOCKET, 1083 SO_SNDBUF, (char *)&sep->se_sndbuf, sizeof(sep->se_sndbuf)) < 0) 1084 syslog(LOG_ERR, "setsockopt (SO_SNDBUF %d): %m", 1085 sep->se_sndbuf); 1086 if (sep->se_rcvbuf != 0 && setsockopt(sep->se_fd, SOL_SOCKET, 1087 SO_RCVBUF, (char *)&sep->se_rcvbuf, sizeof(sep->se_rcvbuf)) < 0) 1088 syslog(LOG_ERR, "setsockopt (SO_RCVBUF %d): %m", 1089 sep->se_rcvbuf); 1090 if (sep->se_type == FAITH_TYPE && setsockopt(sep->se_fd, IPPROTO_IPV6, 1091 IPV6_FAITH, (char *)&on, sizeof(on)) < 0) 1092 syslog(LOG_ERR, "setsockopt (IPV6_FAITH): %m"); 1093#ifdef IPSEC 1094 if (ipsecsetup(sep->se_family, sep->se_fd, sep->se_policy) < 0 && 1095 sep->se_policy) { 1096 syslog(LOG_ERR, "%s/%s: ipsec setup failed", 1097 sep->se_service, sep->se_proto); 1098 (void)close(sep->se_fd); 1099 sep->se_fd = -1; 1100 return; 1101 } 1102#endif 1103 1104 if (bind(sep->se_fd, &sep->se_ctrladdr, sep->se_ctrladdr_size) < 0) { 1105 if (debug) 1106 fprintf(stderr, "bind failed on %s/%s: %s\n", 1107 sep->se_service, sep->se_proto, strerror(errno)); 1108 syslog(LOG_ERR, "%s/%s: bind: %m", 1109 sep->se_service, sep->se_proto); 1110 (void) close(sep->se_fd); 1111 sep->se_fd = -1; 1112 if (!timingout) { 1113 timingout = 1; 1114 alarm(RETRYTIME); 1115 } 1116 return; 1117 } 1118 if (sep->se_socktype == SOCK_STREAM) 1119 listen(sep->se_fd, 10); 1120 1121 EV_SET(&ev, sep->se_fd, EVFILT_READ, EV_ADD | EV_ENABLE, 0, 0, 1122 (intptr_t)sep); 1123 (void) my_kevent(&ev, 1, NULL, 0); 1124 nsock++; 1125 if (sep->se_fd > maxsock) { 1126 maxsock = sep->se_fd; 1127 if (maxsock > rlim_ofile_cur - FD_MARGIN) 1128 bump_nofile(); 1129 } 1130 if (debug) 1131 fprintf(stderr, "registered %s on %d\n", 1132 sep->se_server, sep->se_fd); 1133} 1134 1135/* 1136 * Finish with a service and its socket. 1137 */ 1138void 1139close_sep(sep) 1140 struct servtab *sep; 1141{ 1142 if (sep->se_fd >= 0) { 1143 nsock--; 1144 (void) close(sep->se_fd); 1145 sep->se_fd = -1; 1146 } 1147 sep->se_count = 0; 1148 /* 1149 * Don't keep the pid of this running daemon: when reapchild() 1150 * reaps this pid, it would erroneously increment nsock. 1151 */ 1152 if (sep->se_wait > 1) 1153 sep->se_wait = 1; 1154} 1155 1156void 1157register_rpc(sep) 1158 struct servtab *sep; 1159{ 1160#ifdef RPC 1161 int n; 1162 struct netbuf nbuf; 1163 struct sockaddr_storage ss; 1164 struct netconfig *nconf; 1165 1166 if ((nconf = getnetconfigent(sep->se_proto+4)) == NULL) { 1167 syslog(LOG_ERR, "%s: getnetconfigent failed", 1168 sep->se_proto); 1169 return; 1170 } 1171 n = sizeof ss; 1172 if (getsockname(sep->se_fd, (struct sockaddr *)&ss, &n) < 0) { 1173 syslog(LOG_ERR, "%s/%s: getsockname: %m", 1174 sep->se_service, sep->se_proto); 1175 return; 1176 } 1177 1178 nbuf.buf = &ss; 1179 nbuf.len = ss.ss_len; 1180 nbuf.maxlen = sizeof (struct sockaddr_storage); 1181 for (n = sep->se_rpcversl; n <= sep->se_rpcversh; n++) { 1182 if (debug) 1183 fprintf(stderr, "rpcb_set: %u %d %s %s\n", 1184 sep->se_rpcprog, n, nconf->nc_netid, 1185 taddr2uaddr(nconf, &nbuf)); 1186 (void)rpcb_unset(sep->se_rpcprog, n, nconf); 1187 if (!rpcb_set(sep->se_rpcprog, n, nconf, &nbuf)) 1188 syslog(LOG_ERR, "rpcb_set: %u %d %s %s%s", 1189 sep->se_rpcprog, n, nconf->nc_netid, 1190 taddr2uaddr(nconf, &nbuf), clnt_spcreateerror("")); 1191 } 1192#endif /* RPC */ 1193} 1194 1195void 1196unregister_rpc(sep) 1197 struct servtab *sep; 1198{ 1199#ifdef RPC 1200 int n; 1201 struct netconfig *nconf; 1202 1203 if ((nconf = getnetconfigent(sep->se_proto+4)) == NULL) { 1204 syslog(LOG_ERR, "%s: getnetconfigent failed", 1205 sep->se_proto); 1206 return; 1207 } 1208 1209 for (n = sep->se_rpcversl; n <= sep->se_rpcversh; n++) { 1210 if (debug) 1211 fprintf(stderr, "rpcb_unset(%u, %d, %s)\n", 1212 sep->se_rpcprog, n, nconf->nc_netid); 1213 if (!rpcb_unset(sep->se_rpcprog, n, nconf)) 1214 syslog(LOG_ERR, "rpcb_unset(%u, %d, %s) failed\n", 1215 sep->se_rpcprog, n, nconf->nc_netid); 1216 } 1217#endif /* RPC */ 1218} 1219 1220 1221struct servtab * 1222enter(cp) 1223 struct servtab *cp; 1224{ 1225 struct servtab *sep; 1226 long omask; 1227 1228 sep = (struct servtab *)malloc(sizeof (*sep)); 1229 if (sep == NULL) { 1230 syslog(LOG_ERR, "Out of memory."); 1231 exit(1); 1232 } 1233 *sep = *cp; 1234 sep->se_fd = -1; 1235 sep->se_rpcprog = -1; 1236 omask = sigblock(SIGBLOCK); 1237 sep->se_next = servtab; 1238 servtab = sep; 1239 sigsetmask(omask); 1240 return (sep); 1241} 1242 1243FILE *fconfig = NULL; 1244struct servtab serv; 1245char line[LINE_MAX]; 1246char *defhost; 1247#ifdef IPSEC 1248static char *policy = NULL; 1249#endif 1250 1251int 1252setconfig() 1253{ 1254 if (defhost) 1255 free(defhost); 1256 defhost = newstr("*"); 1257#ifdef IPSEC 1258 if (policy) 1259 free(policy); 1260 policy = NULL; 1261#endif 1262 if (fconfig != NULL) { 1263 fseek(fconfig, 0L, SEEK_SET); 1264 return (1); 1265 } 1266 fconfig = fopen(CONFIG, "r"); 1267 return (fconfig != NULL); 1268} 1269 1270void 1271endconfig() 1272{ 1273 if (fconfig) { 1274 (void) fclose(fconfig); 1275 fconfig = NULL; 1276 } 1277 if (defhost) { 1278 free(defhost); 1279 defhost = 0; 1280 } 1281} 1282 1283struct servtab * 1284getconfigent() 1285{ 1286 struct servtab *sep = &serv; 1287 int argc, val; 1288 char *cp, *cp0, *arg, *buf0, *buf1, *sz0, *sz1; 1289 static char TCPMUX_TOKEN[] = "tcpmux/"; 1290#define MUX_LEN (sizeof(TCPMUX_TOKEN)-1) 1291 char *hostdelim; 1292 1293more: 1294 while ((cp = nextline(fconfig))) { 1295#ifdef IPSEC 1296 /* lines starting with #@ is not a comment, but the policy */ 1297 if (cp[0] == '#' && cp[1] == '@') { 1298 char *p; 1299 for (p = cp + 2; p && *p && isspace(*p); p++) 1300 ; 1301 if (*p == '\0') { 1302 if (policy) 1303 free(policy); 1304 policy = NULL; 1305 } else { 1306 if (ipsecsetup_test(p) < 0) { 1307 syslog(LOG_ERR, 1308 "%s: invalid ipsec policy \"%s\"", 1309 CONFIG, p); 1310 exit(1); 1311 } else { 1312 if (policy) 1313 free(policy); 1314 policy = newstr(p); 1315 } 1316 } 1317 } 1318#endif 1319 if (*cp == '#' || *cp == '\0') 1320 continue; 1321#ifdef MULOG 1322 /* Avoid use of `skip' if there is a danger of it looking 1323 * at continuation lines. 1324 */ 1325 do { 1326 cp++; 1327 } while (*cp == ' ' || *cp == '\t'); 1328 if (*cp == '\0') 1329 continue; 1330 if ((arg = skip(&cp)) == NULL) 1331 continue; 1332 if (strcmp(arg, "DOMAIN")) 1333 continue; 1334 if (curdom) 1335 free(curdom); 1336 curdom = NULL; 1337 while (*cp == ' ' || *cp == '\t') 1338 cp++; 1339 if (*cp == '\0') 1340 continue; 1341 arg = cp; 1342 while (*cp && *cp != ' ' && *cp != '\t') 1343 cp++; 1344 if (*cp != '\0') 1345 *cp++ = '\0'; 1346 curdom = newstr(arg); 1347#endif 1348 break; 1349 } 1350 if (cp == NULL) 1351 return (NULL); 1352 /* 1353 * clear the static buffer, since some fields (se_ctrladdr, 1354 * for example) don't get initialized here. 1355 */ 1356 memset((caddr_t)sep, 0, sizeof *sep); 1357 arg = skip(&cp); 1358 if (cp == NULL) { 1359 /* got an empty line containing just blanks/tabs. */ 1360 goto more; 1361 } 1362 /* Check for a host name. */ 1363 hostdelim = strrchr(arg, ':'); 1364 if (hostdelim) { 1365 *hostdelim = '\0'; 1366 if (arg[0] == '[' && hostdelim > arg && hostdelim[-1] == ']') { 1367 hostdelim[-1] = '\0'; 1368 sep->se_hostaddr = newstr(arg + 1); 1369 } else 1370 sep->se_hostaddr = newstr(arg); 1371 arg = hostdelim + 1; 1372 /* 1373 * If the line is of the form `host:', then just change the 1374 * default host for the following lines. 1375 */ 1376 if (*arg == '\0') { 1377 arg = skip(&cp); 1378 if (cp == NULL) { 1379 free(defhost); 1380 defhost = sep->se_hostaddr; 1381 goto more; 1382 } 1383 } 1384 } else 1385 sep->se_hostaddr = newstr(defhost); 1386 if (strncmp(arg, TCPMUX_TOKEN, MUX_LEN) == 0) { 1387 char *c = arg + MUX_LEN; 1388 if (*c == '+') { 1389 sep->se_type = MUXPLUS_TYPE; 1390 c++; 1391 } else 1392 sep->se_type = MUX_TYPE; 1393 sep->se_service = newstr(c); 1394 } else { 1395 sep->se_service = newstr(arg); 1396 sep->se_type = NORM_TYPE; 1397 } 1398 1399 arg = sskip(&cp); 1400 if (strcmp(arg, "stream") == 0) 1401 sep->se_socktype = SOCK_STREAM; 1402 else if (strcmp(arg, "dgram") == 0) 1403 sep->se_socktype = SOCK_DGRAM; 1404 else if (strcmp(arg, "rdm") == 0) 1405 sep->se_socktype = SOCK_RDM; 1406 else if (strcmp(arg, "seqpacket") == 0) 1407 sep->se_socktype = SOCK_SEQPACKET; 1408 else if (strcmp(arg, "raw") == 0) 1409 sep->se_socktype = SOCK_RAW; 1410 else 1411 sep->se_socktype = -1; 1412 1413 arg = sskip(&cp); 1414 if (sep->se_type == NORM_TYPE && 1415 strncmp(arg, "faith/", strlen("faith/")) == 0) { 1416 arg += strlen("faith/"); 1417 sep->se_type = FAITH_TYPE; 1418 } 1419 sep->se_proto = newstr(arg); 1420 1421#define MALFORMED(arg) \ 1422do { \ 1423 syslog(LOG_ERR, "%s: malformed buffer size option `%s'", \ 1424 sep->se_service, (arg)); \ 1425 goto more; \ 1426} while (0) 1427 1428#define GETVAL(arg) \ 1429do { \ 1430 if (!isdigit(*(arg))) \ 1431 MALFORMED(arg); \ 1432 val = strtol((arg), &cp0, 10); \ 1433 if (cp0 != NULL) { \ 1434 if (cp0[1] != '\0') \ 1435 MALFORMED((arg)); \ 1436 if (cp0[0] == 'k') \ 1437 val *= 1024; \ 1438 if (cp0[0] == 'm') \ 1439 val *= 1024 * 1024; \ 1440 } \ 1441 if (val < 1) { \ 1442 syslog(LOG_ERR, "%s: invalid buffer size `%s'", \ 1443 sep->se_service, (arg)); \ 1444 goto more; \ 1445 } \ 1446} while (0) 1447 1448#define ASSIGN(arg) \ 1449do { \ 1450 if (strcmp((arg), "sndbuf") == 0) \ 1451 sep->se_sndbuf = val; \ 1452 else if (strcmp((arg), "rcvbuf") == 0) \ 1453 sep->se_rcvbuf = val; \ 1454 else \ 1455 MALFORMED((arg)); \ 1456} while (0) 1457 1458 /* 1459 * Extract the send and receive buffer sizes before parsing 1460 * the protocol. 1461 */ 1462 sep->se_sndbuf = sep->se_rcvbuf = 0; 1463 buf0 = buf1 = sz0 = sz1 = NULL; 1464 if ((buf0 = strchr(sep->se_proto, ',')) != NULL) { 1465 /* Not meaningful for Tcpmux services. */ 1466 if (ISMUX(sep)) { 1467 syslog(LOG_ERR, "%s: can't specify buffer sizes for " 1468 "tcpmux services", sep->se_service); 1469 goto more; 1470 } 1471 1472 /* Skip the , */ 1473 *buf0++ = '\0'; 1474 1475 /* Check to see if another socket buffer size was specified. */ 1476 if ((buf1 = strchr(buf0, ',')) != NULL) { 1477 /* Skip the , */ 1478 *buf1++ = '\0'; 1479 1480 /* Make sure a 3rd one wasn't specified. */ 1481 if (strchr(buf1, ',') != NULL) { 1482 syslog(LOG_ERR, "%s: too many buffer sizes", 1483 sep->se_service); 1484 goto more; 1485 } 1486 1487 /* Locate the size. */ 1488 if ((sz1 = strchr(buf1, '=')) == NULL) 1489 MALFORMED(buf1); 1490 1491 /* Skip the = */ 1492 *sz1++ = '\0'; 1493 } 1494 1495 /* Locate the size. */ 1496 if ((sz0 = strchr(buf0, '=')) == NULL) 1497 MALFORMED(buf0); 1498 1499 /* Skip the = */ 1500 *sz0++ = '\0'; 1501 1502 GETVAL(sz0); 1503 ASSIGN(buf0); 1504 1505 if (buf1 != NULL) { 1506 GETVAL(sz1); 1507 ASSIGN(buf1); 1508 } 1509 } 1510 1511#undef ASSIGN 1512#undef GETVAL 1513#undef MALFORMED 1514 1515 if (strcmp(sep->se_proto, "unix") == 0) { 1516 sep->se_family = AF_LOCAL; 1517 } else { 1518 val = strlen(sep->se_proto); 1519 if (!val) { 1520 syslog(LOG_ERR, "%s: invalid protocol specified", 1521 sep->se_service); 1522 goto more; 1523 } 1524 val = sep->se_proto[val - 1]; 1525 switch (val) { 1526 case '4': /*tcp4 or udp4*/ 1527 sep->se_family = AF_INET; 1528 break; 1529#ifdef INET6 1530 case '6': /*tcp6 or udp6*/ 1531 sep->se_family = AF_INET6; 1532 break; 1533#endif 1534 default: 1535 sep->se_family = AF_INET; /*will become AF_INET6*/ 1536 break; 1537 } 1538 if (strncmp(sep->se_proto, "rpc/", 4) == 0) { 1539#ifdef RPC 1540 char *cp, *ccp; 1541 cp = strchr(sep->se_service, '/'); 1542 if (cp == 0) { 1543 syslog(LOG_ERR, "%s: no rpc version", 1544 sep->se_service); 1545 goto more; 1546 } 1547 *cp++ = '\0'; 1548 sep->se_rpcversl = sep->se_rpcversh = 1549 strtol(cp, &ccp, 0); 1550 if (ccp == cp) { 1551 badafterall: 1552 syslog(LOG_ERR, "%s/%s: bad rpc version", 1553 sep->se_service, cp); 1554 goto more; 1555 } 1556 if (*ccp == '-') { 1557 cp = ccp + 1; 1558 sep->se_rpcversh = strtol(cp, &ccp, 0); 1559 if (ccp == cp) 1560 goto badafterall; 1561 } 1562#else 1563 syslog(LOG_ERR, "%s: rpc services not suported", 1564 sep->se_service); 1565 goto more; 1566#endif /* RPC */ 1567 } 1568 } 1569 arg = sskip(&cp); 1570 { 1571 char *cp; 1572 if ((cp = strchr(arg, ':')) == NULL) 1573 cp = strchr(arg, '.'); 1574 if (cp != NULL) { 1575 *cp++ = '\0'; 1576 sep->se_max = atoi(cp); 1577 } else 1578 sep->se_max = TOOMANY; 1579 } 1580 sep->se_wait = strcmp(arg, "wait") == 0; 1581 if (ISMUX(sep)) { 1582 /* 1583 * Silently enforce "nowait" for TCPMUX services since 1584 * they don't have an assigned port to listen on. 1585 */ 1586 sep->se_wait = 0; 1587 1588 if (strncmp(sep->se_proto, "tcp", 3)) { 1589 syslog(LOG_ERR, 1590 "%s: bad protocol for tcpmux service %s", 1591 CONFIG, sep->se_service); 1592 goto more; 1593 } 1594 if (sep->se_socktype != SOCK_STREAM) { 1595 syslog(LOG_ERR, 1596 "%s: bad socket type for tcpmux service %s", 1597 CONFIG, sep->se_service); 1598 goto more; 1599 } 1600 } 1601 sep->se_user = newstr(sskip(&cp)); 1602 if ((sep->se_group = strchr(sep->se_user, ':')) != NULL) 1603 *sep->se_group++ = '\0'; 1604 else if ((sep->se_group = strchr(sep->se_user, '.')) != NULL) 1605 *sep->se_group++ = '\0'; 1606 1607 sep->se_server = newstr(sskip(&cp)); 1608 if (strcmp(sep->se_server, "internal") == 0) { 1609 struct biltin *bi; 1610 1611 for (bi = biltins; bi->bi_service; bi++) 1612 if (bi->bi_socktype == sep->se_socktype && 1613 strcmp(bi->bi_service, sep->se_service) == 0) 1614 break; 1615 if (bi->bi_service == 0) { 1616 syslog(LOG_ERR, "internal service %s unknown", 1617 sep->se_service); 1618 goto more; 1619 } 1620 sep->se_bi = bi; 1621 sep->se_wait = bi->bi_wait; 1622 } else 1623 sep->se_bi = NULL; 1624 argc = 0; 1625 for (arg = skip(&cp); cp; arg = skip(&cp)) { 1626#if MULOG 1627 char *colon; 1628 1629 if (argc == 0 && (colon = strrchr(arg, ':'))) { 1630 while (arg < colon) { 1631 int x; 1632 char *ccp; 1633 1634 switch (*arg++) { 1635 case 'l': 1636 x = 1; 1637 if (isdigit(*arg)) { 1638 x = strtol(arg, &ccp, 0); 1639 if (ccp == arg) 1640 break; 1641 arg = ccp; 1642 } 1643 sep->se_log &= ~MULOG_RFC931; 1644 sep->se_log |= x; 1645 break; 1646 case 'a': 1647 sep->se_log |= MULOG_RFC931; 1648 break; 1649 default: 1650 break; 1651 } 1652 } 1653 arg = colon + 1; 1654 } 1655#endif 1656 if (argc < MAXARGV) 1657 sep->se_argv[argc++] = newstr(arg); 1658 } 1659 while (argc <= MAXARGV) 1660 sep->se_argv[argc++] = NULL; 1661#ifdef IPSEC 1662 sep->se_policy = policy ? newstr(policy) : NULL; 1663#endif 1664 return (sep); 1665} 1666 1667void 1668freeconfig(cp) 1669 struct servtab *cp; 1670{ 1671 int i; 1672 1673 if (cp->se_hostaddr) 1674 free(cp->se_hostaddr); 1675 if (cp->se_service) 1676 free(cp->se_service); 1677 if (cp->se_proto) 1678 free(cp->se_proto); 1679 if (cp->se_user) 1680 free(cp->se_user); 1681 /* Note: se_group is part of the newstr'ed se_user */ 1682 if (cp->se_server) 1683 free(cp->se_server); 1684 for (i = 0; i < MAXARGV; i++) 1685 if (cp->se_argv[i]) 1686 free(cp->se_argv[i]); 1687#ifdef IPSEC 1688 if (cp->se_policy) 1689 free(cp->se_policy); 1690#endif 1691} 1692 1693 1694/* 1695 * Safe skip - if skip returns null, log a syntax error in the 1696 * configuration file and exit. 1697 */ 1698char * 1699sskip(cpp) 1700 char **cpp; 1701{ 1702 char *cp; 1703 1704 cp = skip(cpp); 1705 if (cp == NULL) { 1706 syslog(LOG_ERR, "%s: syntax error", CONFIG); 1707 exit(1); 1708 } 1709 return (cp); 1710} 1711 1712char * 1713skip(cpp) 1714 char **cpp; 1715{ 1716 char *cp = *cpp; 1717 char *start; 1718 1719 if (*cpp == NULL) 1720 return (NULL); 1721 1722again: 1723 while (*cp == ' ' || *cp == '\t') 1724 cp++; 1725 if (*cp == '\0') { 1726 int c; 1727 1728 c = getc(fconfig); 1729 (void) ungetc(c, fconfig); 1730 if (c == ' ' || c == '\t') 1731 if ((cp = nextline(fconfig))) 1732 goto again; 1733 *cpp = NULL; 1734 return (NULL); 1735 } 1736 start = cp; 1737 while (*cp && *cp != ' ' && *cp != '\t') 1738 cp++; 1739 if (*cp != '\0') 1740 *cp++ = '\0'; 1741 *cpp = cp; 1742 return (start); 1743} 1744 1745char * 1746nextline(fd) 1747 FILE *fd; 1748{ 1749 char *cp; 1750 1751 if (fgets(line, sizeof (line), fd) == NULL) 1752 return (NULL); 1753 cp = strchr(line, '\n'); 1754 if (cp) 1755 *cp = '\0'; 1756 return (line); 1757} 1758 1759char * 1760newstr(cp) 1761 char *cp; 1762{ 1763 if ((cp = strdup(cp ? cp : ""))) 1764 return (cp); 1765 syslog(LOG_ERR, "strdup: %m"); 1766 exit(1); 1767} 1768 1769void 1770inetd_setproctitle(a, s) 1771 char *a; 1772 int s; 1773{ 1774 socklen_t size; 1775 struct sockaddr_storage ss; 1776 char hbuf[NI_MAXHOST]; 1777 1778 size = sizeof(ss); 1779 if (getpeername(s, (struct sockaddr *)&ss, &size) == 0) { 1780 if (getnameinfo((struct sockaddr *)&ss, size, hbuf, 1781 sizeof(hbuf), NULL, 0, niflags) == 0) 1782 setproctitle("-%s [%s]", a, hbuf); 1783 else 1784 setproctitle("-%s [?]", a); 1785 } else 1786 setproctitle("-%s", a); 1787} 1788 1789void 1790bump_nofile() 1791{ 1792#ifdef RLIMIT_NOFILE 1793 1794#define FD_CHUNK 32 1795 1796 struct rlimit rl; 1797 1798 if (getrlimit(RLIMIT_NOFILE, &rl) < 0) { 1799 syslog(LOG_ERR, "getrlimit: %m"); 1800 return; 1801 } 1802 rl.rlim_cur = MIN(rl.rlim_max, rl.rlim_cur + FD_CHUNK); 1803 if (rl.rlim_cur <= rlim_ofile_cur) { 1804 syslog(LOG_ERR, 1805 "bump_nofile: cannot extend file limit, max = %d", 1806 (int)rl.rlim_cur); 1807 return; 1808 } 1809 1810 if (setrlimit(RLIMIT_NOFILE, &rl) < 0) { 1811 syslog(LOG_ERR, "setrlimit: %m"); 1812 return; 1813 } 1814 1815 rlim_ofile_cur = rl.rlim_cur; 1816 return; 1817 1818#else 1819 syslog(LOG_ERR, "bump_nofile: cannot extend file limit"); 1820 return; 1821#endif 1822} 1823 1824/* 1825 * Internet services provided internally by inetd: 1826 */ 1827#define BUFSIZE 4096 1828 1829/* ARGSUSED */ 1830void 1831echo_stream(s, sep) /* Echo service -- echo data back */ 1832 int s; 1833 struct servtab *sep; 1834{ 1835 char buffer[BUFSIZE]; 1836 int i; 1837 1838 inetd_setproctitle(sep->se_service, s); 1839 while ((i = read(s, buffer, sizeof(buffer))) > 0 && 1840 write(s, buffer, i) > 0) 1841 ; 1842} 1843 1844/* ARGSUSED */ 1845void 1846echo_dg(s, sep) /* Echo service -- echo data back */ 1847 int s; 1848 struct servtab *sep; 1849{ 1850 char buffer[BUFSIZE]; 1851 int i; 1852 socklen_t size; 1853 struct sockaddr_storage ss; 1854 struct sockaddr *sa; 1855 1856 sa = (struct sockaddr *)&ss; 1857 size = sizeof(ss); 1858 if ((i = recvfrom(s, buffer, sizeof(buffer), 0, sa, &size)) < 0) 1859 return; 1860 if (port_good_dg(sa)) 1861 (void) sendto(s, buffer, i, 0, sa, size); 1862} 1863 1864/* ARGSUSED */ 1865void 1866discard_stream(s, sep) /* Discard service -- ignore data */ 1867 int s; 1868 struct servtab *sep; 1869{ 1870 char buffer[BUFSIZE]; 1871 1872 inetd_setproctitle(sep->se_service, s); 1873 while ((errno = 0, read(s, buffer, sizeof(buffer)) > 0) || 1874 errno == EINTR) 1875 ; 1876} 1877 1878/* ARGSUSED */ 1879void 1880discard_dg(s, sep) /* Discard service -- ignore data */ 1881 int s; 1882 struct servtab *sep; 1883{ 1884 char buffer[BUFSIZE]; 1885 1886 (void) read(s, buffer, sizeof(buffer)); 1887} 1888 1889#include <ctype.h> 1890#define LINESIZ 72 1891char ring[128]; 1892char *endring; 1893 1894void 1895initring() 1896{ 1897 int i; 1898 1899 endring = ring; 1900 1901 for (i = 0; i <= 128; ++i) 1902 if (isprint(i)) 1903 *endring++ = i; 1904} 1905 1906/* ARGSUSED */ 1907void 1908chargen_stream(s, sep) /* Character generator */ 1909 int s; 1910 struct servtab *sep; 1911{ 1912 int len; 1913 char *rs, text[LINESIZ+2]; 1914 1915 inetd_setproctitle(sep->se_service, s); 1916 1917 if (!endring) { 1918 initring(); 1919 rs = ring; 1920 } 1921 1922 text[LINESIZ] = '\r'; 1923 text[LINESIZ + 1] = '\n'; 1924 for (rs = ring;;) { 1925 if ((len = endring - rs) >= LINESIZ) 1926 memmove(text, rs, LINESIZ); 1927 else { 1928 memmove(text, rs, len); 1929 memmove(text + len, ring, LINESIZ - len); 1930 } 1931 if (++rs == endring) 1932 rs = ring; 1933 if (write(s, text, sizeof(text)) != sizeof(text)) 1934 break; 1935 } 1936} 1937 1938/* ARGSUSED */ 1939void 1940chargen_dg(s, sep) /* Character generator */ 1941 int s; 1942 struct servtab *sep; 1943{ 1944 struct sockaddr_storage ss; 1945 struct sockaddr *sa; 1946 static char *rs; 1947 int len; 1948 socklen_t size; 1949 char text[LINESIZ+2]; 1950 1951 if (endring == 0) { 1952 initring(); 1953 rs = ring; 1954 } 1955 1956 sa = (struct sockaddr *)&ss; 1957 size = sizeof(ss); 1958 if (recvfrom(s, text, sizeof(text), 0, sa, &size) < 0) 1959 return; 1960 1961 if (!port_good_dg(sa)) 1962 return; 1963 1964 if ((len = endring - rs) >= LINESIZ) 1965 memmove(text, rs, LINESIZ); 1966 else { 1967 memmove(text, rs, len); 1968 memmove(text + len, ring, LINESIZ - len); 1969 } 1970 if (++rs == endring) 1971 rs = ring; 1972 text[LINESIZ] = '\r'; 1973 text[LINESIZ + 1] = '\n'; 1974 (void) sendto(s, text, sizeof(text), 0, sa, size); 1975} 1976 1977/* 1978 * Return a machine readable date and time, in the form of the 1979 * number of seconds since midnight, Jan 1, 1900. Since gettimeofday 1980 * returns the number of seconds since midnight, Jan 1, 1970, 1981 * we must add 2208988800 seconds to this figure to make up for 1982 * some seventy years Bell Labs was asleep. 1983 */ 1984 1985uint32_t 1986machtime() 1987{ 1988 struct timeval tv; 1989 1990 if (gettimeofday(&tv, NULL) < 0) { 1991 if (debug) 1992 fprintf(stderr, "Unable to get time of day\n"); 1993 return (0); 1994 } 1995#define OFFSET ((uint32_t)25567 * 24*60*60) 1996 return (htonl((uint32_t)(tv.tv_sec + OFFSET))); 1997#undef OFFSET 1998} 1999 2000/* ARGSUSED */ 2001void 2002machtime_stream(s, sep) 2003 int s; 2004 struct servtab *sep; 2005{ 2006 uint32_t result; 2007 2008 result = machtime(); 2009 (void) write(s, (char *) &result, sizeof(result)); 2010} 2011 2012/* ARGSUSED */ 2013void 2014machtime_dg(s, sep) 2015 int s; 2016 struct servtab *sep; 2017{ 2018 uint32_t result; 2019 struct sockaddr_storage ss; 2020 struct sockaddr *sa; 2021 socklen_t size; 2022 2023 sa = (struct sockaddr *)&ss; 2024 size = sizeof(ss); 2025 if (recvfrom(s, (char *)&result, sizeof(result), 0, sa, &size) < 0) 2026 return; 2027 if (!port_good_dg(sa)) 2028 return; 2029 result = machtime(); 2030 (void) sendto(s, (char *) &result, sizeof(result), 0, sa, size); 2031} 2032 2033/* ARGSUSED */ 2034void 2035daytime_stream(s, sep) /* Return human-readable time of day */ 2036 int s; 2037 struct servtab *sep; 2038{ 2039 char buffer[256]; 2040 time_t clock; 2041 int len; 2042 2043 clock = time((time_t *) 0); 2044 2045 len = snprintf(buffer, sizeof buffer, "%.24s\r\n", ctime(&clock)); 2046 (void) write(s, buffer, len); 2047} 2048 2049/* ARGSUSED */ 2050void 2051daytime_dg(s, sep) /* Return human-readable time of day */ 2052 int s; 2053 struct servtab *sep; 2054{ 2055 char buffer[256]; 2056 time_t clock; 2057 struct sockaddr_storage ss; 2058 struct sockaddr *sa; 2059 socklen_t size; 2060 int len; 2061 2062 clock = time((time_t *) 0); 2063 2064 sa = (struct sockaddr *)&ss; 2065 size = sizeof(ss); 2066 if (recvfrom(s, buffer, sizeof(buffer), 0, sa, &size) < 0) 2067 return; 2068 if (!port_good_dg(sa)) 2069 return; 2070 len = snprintf(buffer, sizeof buffer, "%.24s\r\n", ctime(&clock)); 2071 (void) sendto(s, buffer, len, 0, sa, size); 2072} 2073 2074/* 2075 * print_service: 2076 * Dump relevant information to stderr 2077 */ 2078void 2079print_service(action, sep) 2080 char *action; 2081 struct servtab *sep; 2082{ 2083 2084 if (isrpcservice(sep)) 2085 fprintf(stderr, 2086 "%s: %s rpcprog=%d, rpcvers = %d/%d, proto=%s, wait:max=%d.%d, user:group=%s.%s builtin=%lx server=%s" 2087#ifdef IPSEC 2088 " policy=\"%s\"" 2089#endif 2090 "\n", 2091 action, sep->se_service, 2092 sep->se_rpcprog, sep->se_rpcversh, sep->se_rpcversl, sep->se_proto, 2093 sep->se_wait, sep->se_max, sep->se_user, sep->se_group, 2094 (long)sep->se_bi, sep->se_server 2095#ifdef IPSEC 2096 , (sep->se_policy ? sep->se_policy : "") 2097#endif 2098 ); 2099 else 2100 fprintf(stderr, 2101 "%s: %s proto=%s%s, wait:max=%d.%d, user:group=%s.%s builtin=%lx server=%s" 2102#ifdef IPSEC 2103 " policy=%s" 2104#endif 2105 "\n", 2106 action, sep->se_service, 2107 sep->se_type == FAITH_TYPE ? "faith/" : "", 2108 sep->se_proto, 2109 sep->se_wait, sep->se_max, sep->se_user, sep->se_group, 2110 (long)sep->se_bi, sep->se_server 2111#ifdef IPSEC 2112 , (sep->se_policy ? sep->se_policy : "") 2113#endif 2114 ); 2115} 2116 2117void 2118usage() 2119{ 2120 2121#ifdef LIBWRAP 2122 (void)fprintf(stderr, "usage: %s [-dl] [conf]\n", getprogname()); 2123#else 2124 (void)fprintf(stderr, "usage: %s [-d] [conf]\n", getprogname()); 2125#endif 2126 exit(1); 2127} 2128 2129 2130/* 2131 * Based on TCPMUX.C by Mark K. Lottor November 1988 2132 * sri-nic::ps:<mkl>tcpmux.c 2133 */ 2134 2135static int /* # of characters upto \r,\n or \0 */ 2136getline(fd, buf, len) 2137 int fd; 2138 char *buf; 2139 int len; 2140{ 2141 int count = 0, n; 2142 2143 do { 2144 n = read(fd, buf, len-count); 2145 if (n == 0) 2146 return (count); 2147 if (n < 0) 2148 return (-1); 2149 while (--n >= 0) { 2150 if (*buf == '\r' || *buf == '\n' || *buf == '\0') 2151 return (count); 2152 count++; 2153 buf++; 2154 } 2155 } while (count < len); 2156 return (count); 2157} 2158 2159#define MAX_SERV_LEN (256+2) /* 2 bytes for \r\n */ 2160 2161#define strwrite(fd, buf) (void) write(fd, buf, sizeof(buf)-1) 2162 2163void 2164tcpmux(ctrl, sep) 2165 int ctrl; 2166 struct servtab *sep; 2167{ 2168 char service[MAX_SERV_LEN+1]; 2169 int len; 2170 2171 /* Get requested service name */ 2172 if ((len = getline(ctrl, service, MAX_SERV_LEN)) < 0) { 2173 strwrite(ctrl, "-Error reading service name\r\n"); 2174 goto reject; 2175 } 2176 service[len] = '\0'; 2177 2178 if (debug) 2179 fprintf(stderr, "tcpmux: someone wants %s\n", service); 2180 2181 /* 2182 * Help is a required command, and lists available services, 2183 * one per line. 2184 */ 2185 if (!strcasecmp(service, "help")) { 2186 strwrite(ctrl, "+Available services:\r\n"); 2187 strwrite(ctrl, "help\r\n"); 2188 for (sep = servtab; sep != NULL; sep = sep->se_next) { 2189 if (!ISMUX(sep)) 2190 continue; 2191 (void)write(ctrl, sep->se_service, 2192 strlen(sep->se_service)); 2193 strwrite(ctrl, "\r\n"); 2194 } 2195 goto reject; 2196 } 2197 2198 /* Try matching a service in inetd.conf with the request */ 2199 for (sep = servtab; sep != NULL; sep = sep->se_next) { 2200 if (!ISMUX(sep)) 2201 continue; 2202 if (!strcasecmp(service, sep->se_service)) { 2203 if (ISMUXPLUS(sep)) 2204 strwrite(ctrl, "+Go\r\n"); 2205 run_service(ctrl, sep); 2206 return; 2207 } 2208 } 2209 strwrite(ctrl, "-Service not available\r\n"); 2210reject: 2211 _exit(1); 2212} 2213 2214#ifdef MULOG 2215void 2216dolog(sep, ctrl) 2217 struct servtab *sep; 2218 int ctrl; 2219{ 2220 struct sockaddr_storage ss; 2221 struct sockaddr *sa = (struct sockaddr *)&ss; 2222 socklen_t len = sizeof(ss); 2223 char *host, *dp, buf[BUFSIZ]; 2224 int connected = 1; 2225 2226 switch (sep->se_family) { 2227 case AF_INET: 2228#ifdef INET6 2229 case AF_INET6: 2230#endif 2231 break; 2232 default: 2233 return; 2234 } 2235 2236 if (getpeername(ctrl, sa, &len) < 0) { 2237 if (errno != ENOTCONN) { 2238 syslog(LOG_ERR, "getpeername: %m"); 2239 return; 2240 } 2241 if (recvfrom(ctrl, buf, sizeof(buf), MSG_PEEK, sa, &len) < 0) { 2242 syslog(LOG_ERR, "recvfrom: %m"); 2243 return; 2244 } 2245 connected = 0; 2246 } 2247 switch (sa->sa_family) { 2248 case AF_INET: 2249#ifdef INET6 2250 case AF_INET6: 2251#endif 2252 break; 2253 default: 2254 syslog(LOG_ERR, "unexpected address family %u", sa->sa_family); 2255 return; 2256 } 2257 2258 if (getnameinfo(sa, len, buf, sizeof(buf), NULL, 0, 0) != 0) 2259 strcpy(buf, "?"); 2260 host = buf; 2261 2262 switch (sep->se_log & ~MULOG_RFC931) { 2263 case 0: 2264 return; 2265 case 1: 2266 if (curdom == NULL || *curdom == '\0') 2267 break; 2268 dp = host + strlen(host) - strlen(curdom); 2269 if (dp < host) 2270 break; 2271 if (debug) 2272 fprintf(stderr, "check \"%s\" against curdom \"%s\"\n", 2273 host, curdom); 2274 if (strcasecmp(dp, curdom) == 0) 2275 return; 2276 break; 2277 case 2: 2278 default: 2279 break; 2280 } 2281 2282 openlog("", LOG_NOWAIT, MULOG); 2283 2284 if (connected && (sep->se_log & MULOG_RFC931)) 2285 syslog(LOG_INFO, "%s@%s wants %s", 2286 rfc931_name(sa, ctrl), host, sep->se_service); 2287 else 2288 syslog(LOG_INFO, "%s wants %s", 2289 host, sep->se_service); 2290} 2291 2292/* 2293 * From tcp_log by 2294 * Wietse Venema, Eindhoven University of Technology, The Netherlands. 2295 */ 2296#if 0 2297static char sccsid[] = "@(#) rfc931.c 1.3 92/08/31 22:54:46"; 2298#endif 2299 2300#include <setjmp.h> 2301 2302#define RFC931_PORT 113 /* Semi-well-known port */ 2303#define TIMEOUT 4 2304#define TIMEOUT2 10 2305 2306static jmp_buf timebuf; 2307 2308/* timeout - handle timeouts */ 2309 2310static void 2311timeout(sig) 2312 int sig; 2313{ 2314 longjmp(timebuf, sig); 2315} 2316 2317/* rfc931_name - return remote user name */ 2318 2319char * 2320rfc931_name(there, ctrl) 2321 struct sockaddr *there; /* remote link information */ 2322 int ctrl; 2323{ 2324 struct sockaddr_storage here; /* local link information */ 2325 struct sockaddr_storage sin; /* for talking to RFC931 daemon */ 2326 socklen_t length; 2327 int s; 2328 unsigned remote; 2329 unsigned local; 2330 static char user[256]; /* XXX */ 2331 char buf[256]; 2332 char *cp; 2333 char *result = "USER_UNKNOWN"; 2334 int len; 2335 u_int16_t myport, hisport; 2336 2337 /* Find out local port number of our stdin. */ 2338 2339 length = sizeof(here); 2340 if (getsockname(ctrl, (struct sockaddr *) &here, &length) == -1) { 2341 syslog(LOG_ERR, "getsockname: %m"); 2342 return (result); 2343 } 2344 switch (here.ss_family) { 2345 case AF_INET: 2346 myport = ((struct sockaddr_in *)&here)->sin_port; 2347 break; 2348#ifdef INET6 2349 case AF_INET6: 2350 myport = ((struct sockaddr_in6 *)&here)->sin6_port; 2351 break; 2352#endif 2353 } 2354 switch (there->sa_family) { 2355 case AF_INET: 2356 hisport = ((struct sockaddr_in *)&there)->sin_port; 2357 break; 2358#ifdef INET6 2359 case AF_INET6: 2360 hisport = ((struct sockaddr_in6 *)&there)->sin6_port; 2361 break; 2362#endif 2363 } 2364 /* Set up timer so we won't get stuck. */ 2365 2366 if ((s = socket(here.ss_family, SOCK_STREAM, 0)) == -1) { 2367 syslog(LOG_ERR, "socket: %m"); 2368 return (result); 2369 } 2370 2371 sin = here; 2372 switch (sin.ss_family) { 2373 case AF_INET: 2374 ((struct sockaddr_in *)&sin)->sin_port = htons(0); 2375 break; 2376#ifdef INET6 2377 case AF_INET6: 2378 ((struct sockaddr_in6 *)&sin)->sin6_port = htons(0); 2379 break; 2380#endif 2381 } 2382 if (bind(s, (struct sockaddr *) &sin, sin.ss_len) == -1) { 2383 syslog(LOG_ERR, "bind: %m"); 2384 return (result); 2385 } 2386 2387 signal(SIGALRM, timeout); 2388 if (setjmp(timebuf)) { 2389 close(s); /* not: fclose(fp) */ 2390 return (result); 2391 } 2392 alarm(TIMEOUT); 2393 2394 /* Connect to the RFC931 daemon. */ 2395 2396 memcpy(&sin, there, there->sa_len); 2397 switch (sin.ss_family) { 2398 case AF_INET: 2399 ((struct sockaddr_in *)&sin)->sin_port = htons(RFC931_PORT); 2400 break; 2401#ifdef INET6 2402 case AF_INET6: 2403 ((struct sockaddr_in6 *)&sin)->sin6_port = htons(RFC931_PORT); 2404 break; 2405#endif 2406 } 2407 if (connect(s, (struct sockaddr *) &sin, sin.ss_len) == -1) { 2408 close(s); 2409 alarm(0); 2410 return (result); 2411 } 2412 2413 /* Query the RFC 931 server. Would 13-byte writes ever be broken up? */ 2414 (void)snprintf(buf, sizeof buf, "%u,%u\r\n", ntohs(hisport), 2415 ntohs(myport)); 2416 2417 for (len = 0, cp = buf; len < strlen(buf); ) { 2418 int n; 2419 2420 if ((n = write(s, cp, strlen(buf) - len)) == -1) { 2421 close(s); 2422 alarm(0); 2423 return (result); 2424 } 2425 cp += n; 2426 len += n; 2427 } 2428 2429 /* Read response */ 2430 for (cp = buf; cp < buf + sizeof(buf) - 1; ) { 2431 char c; 2432 if (read(s, &c, 1) != 1) { 2433 close(s); 2434 alarm(0); 2435 return (result); 2436 } 2437 if (c == '\n') 2438 break; 2439 *cp++ = c; 2440 } 2441 *cp = '\0'; 2442 2443 if (sscanf(buf, "%u , %u : USERID :%*[^:]:%255s", &remote, &local, 2444 user) == 3 && ntohs(hisport) == remote && ntohs(myport) == local) { 2445 /* Strip trailing carriage return. */ 2446 if ((cp = strchr(user, '\r')) != NULL) 2447 *cp = 0; 2448 result = user; 2449 } 2450 2451 alarm(0); 2452 close(s); 2453 return (result); 2454} 2455#endif 2456 2457/* 2458 * check if the address/port where send data to is one of the obvious ports 2459 * that are used for denial of service attacks like two echo ports 2460 * just echoing data between them 2461 */ 2462int 2463port_good_dg(sa) 2464 struct sockaddr *sa; 2465{ 2466 struct in_addr in; 2467#ifdef INET6 2468 struct in6_addr *in6; 2469#endif 2470 u_int16_t port; 2471 int i, bad; 2472 char hbuf[NI_MAXHOST]; 2473 2474 bad = 0; 2475 2476 switch (sa->sa_family) { 2477 case AF_INET: 2478 in.s_addr = ntohl(((struct sockaddr_in *)sa)->sin_addr.s_addr); 2479 port = ntohs(((struct sockaddr_in *)sa)->sin_port); 2480 v4chk: 2481 if (IN_MULTICAST(in.s_addr)) 2482 goto bad; 2483 switch ((in.s_addr & 0xff000000) >> 24) { 2484 case 0: case 127: case 255: 2485 goto bad; 2486 } 2487 if (dg_broadcast(&in)) 2488 goto bad; 2489 break; 2490#ifdef INET6 2491 case AF_INET6: 2492 in6 = &((struct sockaddr_in6 *)sa)->sin6_addr; 2493 port = ntohs(((struct sockaddr_in6 *)sa)->sin6_port); 2494 if (IN6_IS_ADDR_MULTICAST(in6) || IN6_IS_ADDR_UNSPECIFIED(in6)) 2495 goto bad; 2496 if (IN6_IS_ADDR_V4MAPPED(in6) || IN6_IS_ADDR_V4COMPAT(in6)) { 2497 memcpy(&in, &in6->s6_addr[12], sizeof(in)); 2498 in.s_addr = ntohl(in.s_addr); 2499 goto v4chk; 2500 } 2501 break; 2502#endif 2503 default: 2504 /* XXX unsupported af, is it safe to assume it to be safe? */ 2505 return 1; 2506 } 2507 2508 for (i = 0; bad_ports[i] != 0; i++) { 2509 if (port == bad_ports[i]) 2510 goto bad; 2511 } 2512 2513 return (1); 2514 2515bad: 2516 if (getnameinfo(sa, sa->sa_len, hbuf, sizeof(hbuf), NULL, 0, 2517 niflags) != 0) 2518 strcpy(hbuf, "?"); 2519 syslog(LOG_WARNING,"Possible DoS attack from %s, Port %d", 2520 hbuf, port); 2521 return (0); 2522} 2523 2524/* XXX need optimization */ 2525int 2526dg_broadcast(in) 2527 struct in_addr *in; 2528{ 2529 struct ifaddrs *ifa, *ifap; 2530 struct sockaddr_in *sin; 2531 2532 if (getifaddrs(&ifap) < 0) 2533 return (0); 2534 for (ifa = ifap; ifa; ifa = ifa->ifa_next) { 2535 if (ifa->ifa_addr->sa_family != AF_INET || 2536 (ifa->ifa_flags & IFF_BROADCAST) == 0) 2537 continue; 2538 sin = (struct sockaddr_in *)ifa->ifa_broadaddr; 2539 if (sin->sin_addr.s_addr == in->s_addr) { 2540 freeifaddrs(ifap); 2541 return (1); 2542 } 2543 } 2544 freeifaddrs(ifap); 2545 return (0); 2546} 2547 2548static int 2549my_kevent(const struct kevent *changelist, size_t nchanges, 2550 struct kevent *eventlist, size_t nevents) 2551 2552{ 2553 int result; 2554 2555 while ((result = kevent(kq, changelist, nchanges, eventlist, nevents, 2556 NULL)) < 0) 2557 if (errno != EINTR) { 2558 syslog(LOG_ERR, "kevent: %m"); 2559 exit(EXIT_FAILURE); 2560 } 2561 2562 return (result); 2563} 2564