1 /* 2 * Copyright (c) 1983, 1991, 1993, 1994 3 * The Regents of the University of California. All rights reserved. 4 * 5 * Redistribution and use in source and binary forms, with or without 6 * modification, are permitted provided that the following conditions 7 * are met: 8 * 1. Redistributions of source code must retain the above copyright 9 * notice, this list of conditions and the following disclaimer. 10 * 2. Redistributions in binary form must reproduce the above copyright 11 * notice, this list of conditions and the following disclaimer in the 12 * documentation and/or other materials provided with the distribution. 13 * 3. All advertising materials mentioning features or use of this software 14 * must display the following acknowledgement: 15 * This product includes software developed by the University of 16 * California, Berkeley and its contributors. 17 * 4. Neither the name of the University nor the names of its contributors 18 * may be used to endorse or promote products derived from this software 19 * without specific prior written permission. 20 * 21 * THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND 22 * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE 23 * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE 24 * ARE DISCLAIMED. IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE 25 * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL 26 * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS 27 * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) 28 * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT 29 * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY 30 * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF 31 * SUCH DAMAGE. 32 */ 33 34 #ifndef lint 35 static char copyright[] __attribute__ ((unused)) = 36 "@(#) Copyright (c) 1983, 1991, 1993, 1994\n\ 37 The Regents of the University of California. All rights reserved.\n"; 38 #endif /* not lint */ 39 40 #ifndef lint 41 /* from: @(#)inetd.c 8.4 (Berkeley) 4/13/94"; */ 42 static char inetd_c_rcsid[] __attribute__ ((unused)) = 43 "$Id: inetd.c,v 1.23 1997/04/28 13:55:07 wollman Exp $"; 44 #endif /* not lint */ 45 46 /* 47 * Inetd - Internet super-server 48 * 49 * This program invokes all internet services as needed. Connection-oriented 50 * services are invoked each time a connection is made, by creating a process. 51 * This process is passed the connection as file descriptor 0 and is expected 52 * to do a getpeername to find out the source host and port. 53 * 54 * Datagram oriented services are invoked when a datagram 55 * arrives; a process is created and passed a pending message 56 * on file descriptor 0. Datagram servers may either connect 57 * to their peer, freeing up the original socket for inetd 58 * to receive further messages on, or ``take over the socket'', 59 * processing all arriving datagrams and, eventually, timing 60 * out. The first type of server is said to be ``multi-threaded''; 61 * the second type of server ``single-threaded''. 62 * 63 * Inetd uses a configuration file which is read at startup 64 * and, possibly, at some later time in response to a hangup signal. 65 * The configuration file is ``free format'' with fields given in the 66 * order shown below. Continuation lines for an entry must being with 67 * a space or tab. All fields must be present in each entry. 68 * 69 * service name must be in /etc/services or must 70 * name a tcpmux service 71 * socket type stream/dgram/raw/rdm/seqpacket 72 * protocol must be in /etc/protocols 73 * wait/nowait single-threaded/multi-threaded 74 * user user to run daemon as 75 * server program full path name 76 * server program arguments maximum of MAXARGS (20) 77 * 78 * TCP services without official port numbers are handled with the 79 * RFC1078-based tcpmux internal service. Tcpmux listens on port 1 for 80 * requests. When a connection is made from a foreign host, the service 81 * requested is passed to tcpmux, which looks it up in the servtab list 82 * and returns the proper entry for the service. Tcpmux returns a 83 * negative reply if the service doesn't exist, otherwise the invoked 84 * server is expected to return the positive reply if the service type in 85 * inetd.conf file has the prefix "tcpmux/". If the service type has the 86 * prefix "tcpmux/+", tcpmux will return the positive reply for the 87 * process; this is for compatibility with older server code, and also 88 * allows you to invoke programs that use stdin/stdout without putting any 89 * special server code in them. Services that use tcpmux are "nowait" 90 * because they do not have a well-known port and hence cannot listen 91 * for new requests. 92 * 93 * For RPC services 94 * service name/version must be in /etc/rpc 95 * socket type stream/dgram/raw/rdm/seqpacket 96 * protocol must be in /etc/protocols 97 * wait/nowait single-threaded/multi-threaded 98 * user user to run daemon as 99 * server program full path name 100 * server program arguments maximum of MAXARGS 101 * 102 * Comment lines are indicated by a `#' in column 1. 103 */ 104 #include <sys/param.h> 105 #include <sys/stat.h> 106 #include <sys/ioctl.h> 107 #include <sys/socket.h> 108 #include <sys/wait.h> 109 #include <sys/time.h> 110 #include <sys/resource.h> 111 112 #include <netinet/in.h> 113 #include <arpa/inet.h> 114 #include <rpc/rpc.h> 115 #include <rpc/pmap_clnt.h> 116 117 #include <errno.h> 118 #include <fcntl.h> 119 #include <netdb.h> 120 #include <pwd.h> 121 #include <signal.h> 122 #include <stdio.h> 123 #include <stdlib.h> 124 #include <string.h> 125 #include <syslog.h> 126 #include <unistd.h> 127 #include <libutil.h> 128 #include <sysexits.h> 129 130 #ifdef LOGIN_CAP 131 #include <login_cap.h> 132 #endif 133 134 #include "pathnames.h" 135 136 #define TOOMANY 256 /* don't start more than TOOMANY */ 137 #define CNT_INTVL 60 /* servers in CNT_INTVL sec. */ 138 #define RETRYTIME (60*10) /* retry after bind or server fail */ 139 #define MAX_MAXCHLD 32767 /* max allowable max children */ 140 141 #define SIGBLOCK (sigmask(SIGCHLD)|sigmask(SIGHUP)|sigmask(SIGALRM)) 142 143 int debug = 0; 144 int log = 0; 145 int nsock, maxsock; 146 fd_set allsock; 147 int options; 148 int timingout; 149 int toomany = TOOMANY; 150 struct servent *sp; 151 struct rpcent *rpc; 152 struct in_addr bind_address; 153 154 struct servtab { 155 char *se_service; /* name of service */ 156 int se_socktype; /* type of socket to use */ 157 char *se_proto; /* protocol used */ 158 short se_maxchild; /* max number of children */ 159 short se_numchild; /* current number of children */ 160 pid_t *se_pids; /* array of child pids */ 161 char *se_user; /* user name to run as */ 162 struct biltin *se_bi; /* if built-in, description */ 163 char *se_server; /* server program */ 164 #define MAXARGV 20 165 char *se_argv[MAXARGV+1]; /* program arguments */ 166 int se_fd; /* open descriptor */ 167 struct sockaddr_in se_ctrladdr;/* bound address */ 168 u_char se_type; /* type: normal, mux, or mux+ */ 169 u_char se_checked; /* looked at during merge */ 170 u_char se_accept; /* i.e., wait/nowait mode */ 171 u_char se_rpc; /* ==1 if RPC service */ 172 int se_rpc_prog; /* RPC program number */ 173 u_int se_rpc_lowvers; /* RPC low version */ 174 u_int se_rpc_highvers; /* RPC high version */ 175 int se_count; /* number started since se_time */ 176 struct timeval se_time; /* start of se_count */ 177 struct servtab *se_next; 178 } *servtab; 179 180 #define NORM_TYPE 0 181 #define MUX_TYPE 1 182 #define MUXPLUS_TYPE 2 183 #define ISMUX(sep) (((sep)->se_type == MUX_TYPE) || \ 184 ((sep)->se_type == MUXPLUS_TYPE)) 185 #define ISMUXPLUS(sep) ((sep)->se_type == MUXPLUS_TYPE) 186 187 188 void chargen_dg __P((int, struct servtab *)); 189 void chargen_stream __P((int, struct servtab *)); 190 void close_sep __P((struct servtab *)); 191 void config __P((int)); 192 void daytime_dg __P((int, struct servtab *)); 193 void daytime_stream __P((int, struct servtab *)); 194 void discard_dg __P((int, struct servtab *)); 195 void discard_stream __P((int, struct servtab *)); 196 void echo_dg __P((int, struct servtab *)); 197 void echo_stream __P((int, struct servtab *)); 198 void endconfig __P((void)); 199 struct servtab *enter __P((struct servtab *)); 200 void freeconfig __P((struct servtab *)); 201 struct servtab *getconfigent __P((void)); 202 void machtime_dg __P((int, struct servtab *)); 203 void machtime_stream __P((int, struct servtab *)); 204 char *newstr __P((char *)); 205 char *nextline __P((FILE *)); 206 void print_service __P((char *, struct servtab *)); 207 void addchild __P((struct servtab *, int)); 208 void reapchild __P((int)); 209 void enable __P((struct servtab *)); 210 void disable __P((struct servtab *)); 211 void retry __P((int)); 212 int setconfig __P((void)); 213 void setup __P((struct servtab *)); 214 char *sskip __P((char **)); 215 char *skip __P((char **)); 216 struct servtab *tcpmux __P((int)); 217 218 void unregisterrpc __P((register struct servtab *sep)); 219 220 struct biltin { 221 char *bi_service; /* internally provided service name */ 222 int bi_socktype; /* type of socket supported */ 223 short bi_fork; /* 1 if should fork before call */ 224 short bi_maxchild; /* max number of children (default) */ 225 void (*bi_fn)(); /* function which performs it */ 226 } biltins[] = { 227 /* Echo received data */ 228 { "echo", SOCK_STREAM, 1, 0, echo_stream }, 229 { "echo", SOCK_DGRAM, 0, 0, echo_dg }, 230 231 /* Internet /dev/null */ 232 { "discard", SOCK_STREAM, 1, 0, discard_stream }, 233 { "discard", SOCK_DGRAM, 0, 0, discard_dg }, 234 235 /* Return 32 bit time since 1970 */ 236 { "time", SOCK_STREAM, 0, 0, machtime_stream }, 237 { "time", SOCK_DGRAM, 0, 0, machtime_dg }, 238 239 /* Return human-readable time */ 240 { "daytime", SOCK_STREAM, 0, 0, daytime_stream }, 241 { "daytime", SOCK_DGRAM, 0, 0, daytime_dg }, 242 243 /* Familiar character generator */ 244 { "chargen", SOCK_STREAM, 1, 0, chargen_stream }, 245 { "chargen", SOCK_DGRAM, 0, 0, chargen_dg }, 246 247 { "tcpmux", SOCK_STREAM, 1, 0, (void (*)())tcpmux }, 248 249 { NULL } 250 }; 251 252 #define NUMINT (sizeof(intab) / sizeof(struct inent)) 253 char *CONFIG = _PATH_INETDCONF; 254 char *pid_file = _PATH_INETDPID; 255 256 #ifdef OLD_SETPROCTITLE 257 char **Argv; 258 char *LastArg; 259 #endif 260 261 int 262 main(argc, argv, envp) 263 int argc; 264 char *argv[], *envp[]; 265 { 266 struct servtab *sep; 267 struct passwd *pwd; 268 struct sigvec sv; 269 int tmpint, ch, dofork; 270 pid_t pid; 271 char buf[50]; 272 struct sockaddr_in peer; 273 int i; 274 #ifdef LOGIN_CAP 275 login_cap_t *lc = NULL; 276 #endif 277 278 279 #ifdef OLD_SETPROCTITLE 280 Argv = argv; 281 if (envp == 0 || *envp == 0) 282 envp = argv; 283 while (*envp) 284 envp++; 285 LastArg = envp[-1] + strlen(envp[-1]); 286 #endif 287 288 openlog("inetd", LOG_PID | LOG_NOWAIT, LOG_DAEMON); 289 290 bind_address.s_addr = htonl(INADDR_ANY); 291 while ((ch = getopt(argc, argv, "dlR:a:p:")) != -1) 292 switch(ch) { 293 case 'd': 294 debug = 1; 295 options |= SO_DEBUG; 296 break; 297 case 'l': 298 log = 1; 299 break; 300 case 'R': { /* invocation rate */ 301 char *p; 302 303 tmpint = strtol(optarg, &p, 0); 304 if (tmpint < 1 || *p) 305 syslog(LOG_ERR, 306 "-R %s: bad value for service invocation rate", 307 optarg); 308 else 309 toomany = tmpint; 310 break; 311 } 312 case 'a': 313 if (!inet_aton(optarg, &bind_address)) { 314 syslog(LOG_ERR, 315 "-a %s: invalid IP address", optarg); 316 exit(EX_USAGE); 317 } 318 break; 319 case 'p': 320 pid_file = optarg; 321 break; 322 case '?': 323 default: 324 syslog(LOG_ERR, 325 "usage: inetd [-dl] [-a address] [-R rate]" 326 " [-p pidfile] [conf-file]"); 327 exit(EX_USAGE); 328 } 329 argc -= optind; 330 argv += optind; 331 332 if (argc > 0) 333 CONFIG = argv[0]; 334 if (debug == 0) { 335 FILE *fp; 336 if (daemon(0, 0) < 0) { 337 syslog(LOG_WARNING, "daemon(0,0) failed: %m"); 338 } 339 /* 340 * In case somebody has started inetd manually, we need to 341 * clear the logname, so that old servers run as root do not 342 * get the user's logname.. 343 */ 344 if (setlogin("") < 0) { 345 syslog(LOG_WARNING, "cannot clear logname: %m"); 346 /* no big deal if it fails.. */ 347 } 348 pid = getpid(); 349 fp = fopen(pid_file, "w"); 350 if (fp) { 351 fprintf(fp, "%ld\n", (long)pid); 352 fclose(fp); 353 } else { 354 syslog(LOG_WARNING, "%s: %m", pid_file); 355 } 356 } 357 memset(&sv, 0, sizeof(sv)); 358 sv.sv_mask = SIGBLOCK; 359 sv.sv_handler = retry; 360 sigvec(SIGALRM, &sv, (struct sigvec *)0); 361 config(SIGHUP); 362 sv.sv_handler = config; 363 sigvec(SIGHUP, &sv, (struct sigvec *)0); 364 sv.sv_handler = reapchild; 365 sigvec(SIGCHLD, &sv, (struct sigvec *)0); 366 367 { 368 /* space for daemons to overwrite environment for ps */ 369 #define DUMMYSIZE 100 370 char dummy[DUMMYSIZE]; 371 372 (void)memset(dummy, 'x', DUMMYSIZE - 1); 373 dummy[DUMMYSIZE - 1] = '\0'; 374 (void)setenv("inetd_dummy", dummy, 1); 375 } 376 377 for (;;) { 378 int n, ctrl; 379 fd_set readable; 380 381 if (nsock == 0) { 382 (void) sigblock(SIGBLOCK); 383 while (nsock == 0) 384 sigpause(0L); 385 (void) sigsetmask(0L); 386 } 387 readable = allsock; 388 if ((n = select(maxsock + 1, &readable, (fd_set *)0, 389 (fd_set *)0, (struct timeval *)0)) <= 0) { 390 if (n < 0 && errno != EINTR) 391 syslog(LOG_WARNING, "select: %m"); 392 sleep(1); 393 continue; 394 } 395 for (sep = servtab; n && sep; sep = sep->se_next) 396 if (sep->se_fd != -1 && FD_ISSET(sep->se_fd, &readable)) { 397 n--; 398 if (debug) 399 fprintf(stderr, "someone wants %s\n", 400 sep->se_service); 401 if (sep->se_accept && sep->se_socktype == SOCK_STREAM) { 402 ctrl = accept(sep->se_fd, (struct sockaddr *)0, 403 (int *)0); 404 if (debug) 405 fprintf(stderr, "accept, ctrl %d\n", ctrl); 406 if (ctrl < 0) { 407 if (errno != EINTR) 408 syslog(LOG_WARNING, 409 "accept (for %s): %m", 410 sep->se_service); 411 continue; 412 } 413 if (log) { 414 i = sizeof peer; 415 if(getpeername(ctrl, (struct sockaddr *) 416 &peer, &i)) { 417 syslog(LOG_WARNING, 418 "getpeername(for %s): %m", 419 sep->se_service); 420 continue; 421 } 422 syslog(LOG_INFO,"%s from %s", 423 sep->se_service, 424 inet_ntoa(peer.sin_addr)); 425 } 426 /* 427 * Call tcpmux to find the real service to exec. 428 */ 429 if (sep->se_bi && 430 sep->se_bi->bi_fn == (void (*)()) tcpmux) { 431 struct servtab *tsep; 432 433 tsep = tcpmux(ctrl); 434 if (tsep == NULL) { 435 close(ctrl); 436 continue; 437 } 438 sep = tsep; 439 } 440 } else 441 ctrl = sep->se_fd; 442 (void) sigblock(SIGBLOCK); 443 pid = 0; 444 dofork = (sep->se_bi == 0 || sep->se_bi->bi_fork); 445 if (dofork) { 446 if (sep->se_count++ == 0) 447 (void)gettimeofday(&sep->se_time, 448 (struct timezone *)0); 449 else if (sep->se_count >= toomany) { 450 struct timeval now; 451 452 (void)gettimeofday(&now, (struct timezone *)0); 453 if (now.tv_sec - sep->se_time.tv_sec > 454 CNT_INTVL) { 455 sep->se_time = now; 456 sep->se_count = 1; 457 } else { 458 syslog(LOG_ERR, 459 "%s/%s server failing (looping), service terminated", 460 sep->se_service, sep->se_proto); 461 close_sep(sep); 462 sigsetmask(0L); 463 if (!timingout) { 464 timingout = 1; 465 alarm(RETRYTIME); 466 } 467 continue; 468 } 469 } 470 pid = fork(); 471 } 472 if (pid < 0) { 473 syslog(LOG_ERR, "fork: %m"); 474 if (sep->se_accept && 475 sep->se_socktype == SOCK_STREAM) 476 close(ctrl); 477 sigsetmask(0L); 478 sleep(1); 479 continue; 480 } 481 if (pid) 482 addchild(sep, pid); 483 sigsetmask(0L); 484 if (pid == 0) { 485 if (dofork) { 486 if (debug) 487 fprintf(stderr, "+ Closing from %d\n", 488 maxsock); 489 for (tmpint = maxsock; tmpint > 2; tmpint--) 490 if (tmpint != ctrl) 491 (void) close(tmpint); 492 } 493 if (sep->se_bi) { 494 (*sep->se_bi->bi_fn)(ctrl, sep); 495 /* NOTREACHED */ 496 } else { 497 if (debug) 498 fprintf(stderr, "%d execl %s\n", 499 getpid(), sep->se_server); 500 dup2(ctrl, 0); 501 close(ctrl); 502 dup2(0, 1); 503 dup2(0, 2); 504 if ((pwd = getpwnam(sep->se_user)) == NULL) { 505 syslog(LOG_ERR, 506 "%s/%s: %s: No such user", 507 sep->se_service, sep->se_proto, 508 sep->se_user); 509 if (sep->se_socktype != SOCK_STREAM) 510 recv(0, buf, sizeof (buf), 0); 511 _exit(EX_NOUSER); 512 } 513 #ifdef LOGIN_CAP 514 /* 515 * Establish the class now, falls back to 516 * the "default" if unavailable. 517 */ 518 lc = login_getpwclass(pwd); 519 #endif 520 if (setsid() < 0) { 521 syslog(LOG_ERR, 522 "%s: can't setsid(): %m", 523 sep->se_service); 524 /* _exit(EX_OSERR); not fatal yet */ 525 } 526 #ifdef LOGIN_CAP 527 if (setusercontext(lc, pwd, pwd->pw_uid, 528 LOGIN_SETALL) != 0) { 529 syslog(LOG_ERR, 530 "%s: can't setusercontext(..%s..): %m", 531 sep->se_service, sep->se_user); 532 _exit(EX_OSERR); 533 } 534 #else 535 if (pwd->pw_uid) { 536 if (setlogin(sep->se_user) < 0) { 537 syslog(LOG_ERR, 538 "%s: can't setlogin(%s): %m", 539 sep->se_service, sep->se_user); 540 /* _exit(EX_OSERR); not yet */ 541 } 542 if (setgid(pwd->pw_gid) < 0) { 543 syslog(LOG_ERR, 544 "%s: can't set gid %d: %m", 545 sep->se_service, pwd->pw_gid); 546 _exit(EX_OSERR); 547 } 548 (void) initgroups(pwd->pw_name, 549 pwd->pw_gid); 550 if (setuid(pwd->pw_uid) < 0) { 551 syslog(LOG_ERR, 552 "%s: can't set uid %d: %m", 553 sep->se_service, pwd->pw_uid); 554 _exit(EX_OSERR); 555 } 556 } 557 #endif 558 execv(sep->se_server, sep->se_argv); 559 if (sep->se_socktype != SOCK_STREAM) 560 recv(0, buf, sizeof (buf), 0); 561 syslog(LOG_ERR, 562 "cannot execute %s: %m", sep->se_server); 563 _exit(EX_OSERR); 564 } 565 } 566 if (sep->se_accept && sep->se_socktype == SOCK_STREAM) 567 close(ctrl); 568 } 569 } 570 } 571 572 /* 573 * Record a new child pid for this service. If we've reached the 574 * limit on children, then stop accepting incoming requests. 575 */ 576 577 void 578 addchild(struct servtab *sep, pid_t pid) 579 { 580 #ifdef SANITY_CHECK 581 if (sep->se_numchild >= sep->se_maxchild) { 582 syslog(LOG_ERR, "%s: %d >= %d", 583 __FUNCTION__, sep->se_numchild, sep->se_maxchild); 584 exit(EX_SOFTWARE); 585 } 586 #endif 587 if (sep->se_maxchild == 0) 588 return; 589 sep->se_pids[sep->se_numchild++] = pid; 590 if (sep->se_numchild == sep->se_maxchild) 591 disable(sep); 592 } 593 594 /* 595 * Some child process has exited. See if it's on somebody's list. 596 */ 597 598 void 599 reapchild(signo) 600 int signo; 601 { 602 int k, status; 603 pid_t pid; 604 struct servtab *sep; 605 606 for (;;) { 607 pid = wait3(&status, WNOHANG, (struct rusage *)0); 608 if (pid <= 0) 609 break; 610 if (debug) 611 fprintf(stderr, "%d reaped, status %#x\n", 612 pid, status); 613 for (sep = servtab; sep; sep = sep->se_next) { 614 for (k = 0; k < sep->se_numchild; k++) 615 if (sep->se_pids[k] == pid) 616 break; 617 if (k == sep->se_numchild) 618 continue; 619 if (sep->se_numchild == sep->se_maxchild) 620 enable(sep); 621 sep->se_pids[k] = sep->se_pids[--sep->se_numchild]; 622 if (status) 623 syslog(LOG_WARNING, 624 "%s[%d]: exit status 0x%x", 625 sep->se_server, pid, status); 626 break; 627 } 628 } 629 } 630 631 void 632 config(signo) 633 int signo; 634 { 635 struct servtab *sep, *new, **sepp; 636 struct passwd *pwd; 637 long omask; 638 639 if (!setconfig()) { 640 syslog(LOG_ERR, "%s: %m", CONFIG); 641 return; 642 } 643 for (sep = servtab; sep; sep = sep->se_next) 644 sep->se_checked = 0; 645 while ((new = getconfigent())) { 646 if ((pwd = getpwnam(new->se_user)) == NULL) { 647 syslog(LOG_ERR, 648 "%s/%s: No such user '%s', service ignored", 649 new->se_service, new->se_proto, new->se_user); 650 continue; 651 } 652 for (sep = servtab; sep; sep = sep->se_next) 653 if (strcmp(sep->se_service, new->se_service) == 0 && 654 strcmp(sep->se_proto, new->se_proto) == 0) 655 break; 656 if (sep != 0) { 657 int i; 658 659 #define SWAP(a, b) { typeof(a) c = a; a = b; b = c; } 660 omask = sigblock(SIGBLOCK); 661 /* copy over outstanding child pids */ 662 if (sep->se_maxchild && new->se_maxchild) { 663 new->se_numchild = sep->se_numchild; 664 if (new->se_numchild > new->se_maxchild) 665 new->se_numchild = new->se_maxchild; 666 memcpy(new->se_pids, sep->se_pids, 667 new->se_numchild * sizeof(*new->se_pids)); 668 } 669 SWAP(sep->se_pids, new->se_pids); 670 sep->se_maxchild = new->se_maxchild; 671 sep->se_numchild = new->se_numchild; 672 /* might need to turn on or off service now */ 673 if (sep->se_fd >= 0) { 674 if (sep->se_maxchild 675 && sep->se_numchild == sep->se_maxchild) { 676 if (FD_ISSET(sep->se_fd, &allsock)) 677 disable(sep); 678 } else { 679 if (!FD_ISSET(sep->se_fd, &allsock)) 680 enable(sep); 681 } 682 } 683 sep->se_accept = new->se_accept; 684 if (new->se_user) 685 SWAP(sep->se_user, new->se_user); 686 if (new->se_server) 687 SWAP(sep->se_server, new->se_server); 688 for (i = 0; i < MAXARGV; i++) 689 SWAP(sep->se_argv[i], new->se_argv[i]); 690 sigsetmask(omask); 691 freeconfig(new); 692 if (debug) 693 print_service("REDO", sep); 694 } else { 695 sep = enter(new); 696 if (debug) 697 print_service("ADD ", sep); 698 } 699 sep->se_checked = 1; 700 if (ISMUX(sep)) { 701 sep->se_fd = -1; 702 continue; 703 } 704 if (!sep->se_rpc) { 705 sp = getservbyname(sep->se_service, sep->se_proto); 706 if (sp == 0) { 707 syslog(LOG_ERR, "%s/%s: unknown service", 708 sep->se_service, sep->se_proto); 709 sep->se_checked = 0; 710 continue; 711 } 712 if (sp->s_port != sep->se_ctrladdr.sin_port) { 713 sep->se_ctrladdr.sin_family = AF_INET; 714 sep->se_ctrladdr.sin_addr = bind_address; 715 sep->se_ctrladdr.sin_port = sp->s_port; 716 if (sep->se_fd >= 0) 717 close_sep(sep); 718 } 719 } else { 720 rpc = getrpcbyname(sep->se_service); 721 if (rpc == 0) { 722 syslog(LOG_ERR, "%s/%s unknown RPC service.", 723 sep->se_service, sep->se_proto); 724 if (sep->se_fd != -1) 725 (void) close(sep->se_fd); 726 sep->se_fd = -1; 727 continue; 728 } 729 if (rpc->r_number != sep->se_rpc_prog) { 730 if (sep->se_rpc_prog) 731 unregisterrpc(sep); 732 sep->se_rpc_prog = rpc->r_number; 733 if (sep->se_fd != -1) 734 (void) close(sep->se_fd); 735 sep->se_fd = -1; 736 } 737 } 738 if (sep->se_fd == -1) 739 setup(sep); 740 } 741 endconfig(); 742 /* 743 * Purge anything not looked at above. 744 */ 745 omask = sigblock(SIGBLOCK); 746 sepp = &servtab; 747 while ((sep = *sepp)) { 748 if (sep->se_checked) { 749 sepp = &sep->se_next; 750 continue; 751 } 752 *sepp = sep->se_next; 753 if (sep->se_fd >= 0) 754 close_sep(sep); 755 if (debug) 756 print_service("FREE", sep); 757 if (sep->se_rpc && sep->se_rpc_prog > 0) 758 unregisterrpc(sep); 759 freeconfig(sep); 760 free((char *)sep); 761 } 762 (void) sigsetmask(omask); 763 } 764 765 void 766 unregisterrpc(sep) 767 struct servtab *sep; 768 { 769 int i; 770 struct servtab *sepp; 771 long omask; 772 773 omask = sigblock(SIGBLOCK); 774 for (sepp = servtab; sepp; sepp = sepp->se_next) { 775 if (sepp == sep) 776 continue; 777 if (sep->se_checked == 0 || 778 !sepp->se_rpc || 779 sep->se_rpc_prog != sepp->se_rpc_prog) 780 continue; 781 return; 782 } 783 if (debug) 784 print_service("UNREG", sep); 785 for (i = sep->se_rpc_lowvers; i <= sep->se_rpc_highvers; i++) 786 pmap_unset(sep->se_rpc_prog, i); 787 if (sep->se_fd != -1) 788 (void) close(sep->se_fd); 789 sep->se_fd = -1; 790 (void) sigsetmask(omask); 791 } 792 793 void 794 retry(signo) 795 int signo; 796 { 797 struct servtab *sep; 798 799 timingout = 0; 800 for (sep = servtab; sep; sep = sep->se_next) 801 if (sep->se_fd == -1 && !ISMUX(sep)) 802 setup(sep); 803 } 804 805 void 806 setup(sep) 807 struct servtab *sep; 808 { 809 int on = 1; 810 811 if ((sep->se_fd = socket(AF_INET, sep->se_socktype, 0)) < 0) { 812 if (debug) 813 fprintf(stderr, "socket failed on %s/%s: %s\n", 814 sep->se_service, sep->se_proto, 815 strerror(errno)); 816 syslog(LOG_ERR, "%s/%s: socket: %m", 817 sep->se_service, sep->se_proto); 818 return; 819 } 820 #define turnon(fd, opt) \ 821 setsockopt(fd, SOL_SOCKET, opt, (char *)&on, sizeof (on)) 822 if (strcmp(sep->se_proto, "tcp") == 0 && (options & SO_DEBUG) && 823 turnon(sep->se_fd, SO_DEBUG) < 0) 824 syslog(LOG_ERR, "setsockopt (SO_DEBUG): %m"); 825 if (turnon(sep->se_fd, SO_REUSEADDR) < 0) 826 syslog(LOG_ERR, "setsockopt (SO_REUSEADDR): %m"); 827 #ifdef SO_PRIVSTATE 828 if (turnon(sep->se_fd, SO_PRIVSTATE) < 0) 829 syslog(LOG_ERR, "setsockopt (SO_PRIVSTATE): %m"); 830 #endif 831 #undef turnon 832 if (bind(sep->se_fd, (struct sockaddr *)&sep->se_ctrladdr, 833 sizeof (sep->se_ctrladdr)) < 0) { 834 if (debug) 835 fprintf(stderr, "bind failed on %s/%s: %s\n", 836 sep->se_service, sep->se_proto, 837 strerror(errno)); 838 syslog(LOG_ERR, "%s/%s: bind: %m", 839 sep->se_service, sep->se_proto); 840 (void) close(sep->se_fd); 841 sep->se_fd = -1; 842 if (!timingout) { 843 timingout = 1; 844 alarm(RETRYTIME); 845 } 846 return; 847 } 848 if (sep->se_rpc) { 849 int i, len = sizeof(struct sockaddr); 850 851 if (getsockname(sep->se_fd, 852 (struct sockaddr*)&sep->se_ctrladdr, &len) < 0){ 853 syslog(LOG_ERR, "%s/%s: getsockname: %m", 854 sep->se_service, sep->se_proto); 855 (void) close(sep->se_fd); 856 sep->se_fd = -1; 857 return; 858 } 859 if (debug) 860 print_service("REG ", sep); 861 for (i = sep->se_rpc_lowvers; i <= sep->se_rpc_highvers; i++) { 862 pmap_unset(sep->se_rpc_prog, i); 863 pmap_set(sep->se_rpc_prog, i, 864 (sep->se_socktype == SOCK_DGRAM) 865 ? IPPROTO_UDP : IPPROTO_TCP, 866 ntohs(sep->se_ctrladdr.sin_port)); 867 } 868 869 } 870 if (sep->se_socktype == SOCK_STREAM) 871 listen(sep->se_fd, 64); 872 enable(sep); 873 if (debug) { 874 fprintf(stderr, "registered %s on %d\n", 875 sep->se_server, sep->se_fd); 876 } 877 } 878 879 /* 880 * Finish with a service and its socket. 881 */ 882 void 883 close_sep(sep) 884 struct servtab *sep; 885 { 886 if (sep->se_fd >= 0) { 887 if (FD_ISSET(sep->se_fd, &allsock)) 888 disable(sep); 889 (void) close(sep->se_fd); 890 sep->se_fd = -1; 891 } 892 sep->se_count = 0; 893 sep->se_numchild = 0; /* forget about any existing children */ 894 } 895 896 struct servtab * 897 enter(cp) 898 struct servtab *cp; 899 { 900 struct servtab *sep; 901 long omask; 902 903 sep = (struct servtab *)malloc(sizeof (*sep)); 904 if (sep == (struct servtab *)0) { 905 syslog(LOG_ERR, "Out of memory."); 906 exit(EX_OSERR); 907 } 908 *sep = *cp; 909 sep->se_fd = -1; 910 omask = sigblock(SIGBLOCK); 911 sep->se_next = servtab; 912 servtab = sep; 913 sigsetmask(omask); 914 return (sep); 915 } 916 917 void 918 enable(struct servtab *sep) 919 { 920 if (debug) 921 fprintf(stderr, 922 "enabling %s, fd %d", sep->se_service, sep->se_fd); 923 #ifdef SANITY_CHECK 924 if (sep->se_fd < 0) { 925 syslog(LOG_ERR, 926 "%s: %s: bad fd", __FUNCTION__, sep->se_service); 927 exit(EX_SOFTWARE); 928 } 929 if (ISMUX(sep)) { 930 syslog(LOG_ERR, 931 "%s: %s: is mux", __FUNCTION__, sep->se_service); 932 exit(EX_SOFTWARE); 933 } 934 if (FD_ISSET(sep->se_fd, &allsock)) { 935 syslog(LOG_ERR, 936 "%s: %s: not off", __FUNCTION__, sep->se_service); 937 exit(EX_SOFTWARE); 938 } 939 #endif 940 FD_SET(sep->se_fd, &allsock); 941 nsock++; 942 if (sep->se_fd > maxsock) 943 maxsock = sep->se_fd; 944 } 945 946 void 947 disable(struct servtab *sep) 948 { 949 if (debug) 950 fprintf(stderr, 951 "disabling %s, fd %d", sep->se_service, sep->se_fd); 952 #ifdef SANITY_CHECK 953 if (sep->se_fd < 0) { 954 syslog(LOG_ERR, 955 "%s: %s: bad fd", __FUNCTION__, sep->se_service); 956 exit(EX_SOFTWARE); 957 } 958 if (ISMUX(sep)) { 959 syslog(LOG_ERR, 960 "%s: %s: is mux", __FUNCTION__, sep->se_service); 961 exit(EX_SOFTWARE); 962 } 963 if (!FD_ISSET(sep->se_fd, &allsock)) { 964 syslog(LOG_ERR, 965 "%s: %s: not on", __FUNCTION__, sep->se_service); 966 exit(EX_SOFTWARE); 967 } 968 if (nsock == 0) { 969 syslog(LOG_ERR, "%s: nsock=0", __FUNCTION__); 970 exit(EX_SOFTWARE); 971 } 972 #endif 973 FD_CLR(sep->se_fd, &allsock); 974 nsock--; 975 if (sep->se_fd == maxsock) 976 maxsock--; 977 } 978 979 FILE *fconfig = NULL; 980 struct servtab serv; 981 char line[LINE_MAX]; 982 983 int 984 setconfig() 985 { 986 987 if (fconfig != NULL) { 988 fseek(fconfig, 0L, SEEK_SET); 989 return (1); 990 } 991 fconfig = fopen(CONFIG, "r"); 992 return (fconfig != NULL); 993 } 994 995 void 996 endconfig() 997 { 998 if (fconfig) { 999 (void) fclose(fconfig); 1000 fconfig = NULL; 1001 } 1002 } 1003 1004 struct servtab * 1005 getconfigent() 1006 { 1007 struct servtab *sep = &serv; 1008 int argc; 1009 char *cp, *arg, *s; 1010 char *versp; 1011 static char TCPMUX_TOKEN[] = "tcpmux/"; 1012 #define MUX_LEN (sizeof(TCPMUX_TOKEN)-1) 1013 1014 more: 1015 while ((cp = nextline(fconfig)) && (*cp == '#' || *cp == '\0')) 1016 ; 1017 if (cp == NULL) 1018 return ((struct servtab *)0); 1019 /* 1020 * clear the static buffer, since some fields (se_ctrladdr, 1021 * for example) don't get initialized here. 1022 */ 1023 memset((caddr_t)sep, 0, sizeof *sep); 1024 arg = skip(&cp); 1025 if (cp == NULL) { 1026 /* got an empty line containing just blanks/tabs. */ 1027 goto more; 1028 } 1029 if (strncmp(arg, TCPMUX_TOKEN, MUX_LEN) == 0) { 1030 char *c = arg + MUX_LEN; 1031 if (*c == '+') { 1032 sep->se_type = MUXPLUS_TYPE; 1033 c++; 1034 } else 1035 sep->se_type = MUX_TYPE; 1036 sep->se_service = newstr(c); 1037 } else { 1038 sep->se_service = newstr(arg); 1039 sep->se_type = NORM_TYPE; 1040 } 1041 arg = sskip(&cp); 1042 if (strcmp(arg, "stream") == 0) 1043 sep->se_socktype = SOCK_STREAM; 1044 else if (strcmp(arg, "dgram") == 0) 1045 sep->se_socktype = SOCK_DGRAM; 1046 else if (strcmp(arg, "rdm") == 0) 1047 sep->se_socktype = SOCK_RDM; 1048 else if (strcmp(arg, "seqpacket") == 0) 1049 sep->se_socktype = SOCK_SEQPACKET; 1050 else if (strcmp(arg, "raw") == 0) 1051 sep->se_socktype = SOCK_RAW; 1052 else 1053 sep->se_socktype = -1; 1054 sep->se_proto = newstr(sskip(&cp)); 1055 if (strncmp(sep->se_proto, "rpc/", 4) == 0) { 1056 memmove(sep->se_proto, sep->se_proto + 4, 1057 strlen(sep->se_proto) + 1 - 4); 1058 sep->se_rpc = 1; 1059 sep->se_rpc_prog = sep->se_rpc_lowvers = 1060 sep->se_rpc_lowvers = 0; 1061 sep->se_ctrladdr.sin_family = AF_INET; 1062 sep->se_ctrladdr.sin_port = 0; 1063 sep->se_ctrladdr.sin_addr = bind_address; 1064 if ((versp = rindex(sep->se_service, '/'))) { 1065 *versp++ = '\0'; 1066 switch (sscanf(versp, "%d-%d", 1067 &sep->se_rpc_lowvers, 1068 &sep->se_rpc_highvers)) { 1069 case 2: 1070 break; 1071 case 1: 1072 sep->se_rpc_highvers = 1073 sep->se_rpc_lowvers; 1074 break; 1075 default: 1076 syslog(LOG_ERR, 1077 "bad RPC version specifier; %s\n", 1078 sep->se_service); 1079 freeconfig(sep); 1080 goto more; 1081 } 1082 } 1083 else { 1084 sep->se_rpc_lowvers = 1085 sep->se_rpc_highvers = 1; 1086 } 1087 } 1088 arg = sskip(&cp); 1089 if (!strncmp(arg, "wait", 4)) 1090 sep->se_accept = 0; 1091 else if (!strncmp(arg, "nowait", 6)) 1092 sep->se_accept = 1; 1093 else { 1094 syslog(LOG_ERR, 1095 "%s: bad wait/nowait for service %s", 1096 CONFIG, sep->se_service); 1097 goto more; 1098 } 1099 sep->se_maxchild = -1; 1100 if ((s = strchr(arg, '/')) != NULL) { 1101 char *eptr; 1102 u_long val; 1103 1104 val = strtoul(s + 1, &eptr, 10); 1105 if (eptr == s + 1 || *eptr || val > MAX_MAXCHLD) { 1106 syslog(LOG_ERR, 1107 "%s: bad max-child for service %s", 1108 CONFIG, sep->se_service); 1109 goto more; 1110 } 1111 sep->se_maxchild = val; 1112 } 1113 if (ISMUX(sep)) { 1114 /* 1115 * Silently enforce "nowait" mode for TCPMUX services 1116 * since they don't have an assigned port to listen on. 1117 */ 1118 sep->se_accept = 1; 1119 if (strcmp(sep->se_proto, "tcp")) { 1120 syslog(LOG_ERR, 1121 "%s: bad protocol for tcpmux service %s", 1122 CONFIG, sep->se_service); 1123 goto more; 1124 } 1125 if (sep->se_socktype != SOCK_STREAM) { 1126 syslog(LOG_ERR, 1127 "%s: bad socket type for tcpmux service %s", 1128 CONFIG, sep->se_service); 1129 goto more; 1130 } 1131 } 1132 sep->se_user = newstr(sskip(&cp)); 1133 sep->se_server = newstr(sskip(&cp)); 1134 if (strcmp(sep->se_server, "internal") == 0) { 1135 struct biltin *bi; 1136 1137 for (bi = biltins; bi->bi_service; bi++) 1138 if (bi->bi_socktype == sep->se_socktype && 1139 strcmp(bi->bi_service, sep->se_service) == 0) 1140 break; 1141 if (bi->bi_service == 0) { 1142 syslog(LOG_ERR, "internal service %s unknown", 1143 sep->se_service); 1144 goto more; 1145 } 1146 sep->se_accept = 1; /* force accept mode for built-ins */ 1147 sep->se_bi = bi; 1148 } else 1149 sep->se_bi = NULL; 1150 if (sep->se_maxchild < 0) /* apply default max-children */ 1151 if (sep->se_bi) 1152 sep->se_maxchild = sep->se_bi->bi_maxchild; 1153 else 1154 sep->se_maxchild = sep->se_accept ? 0 : 1; 1155 if (sep->se_maxchild) { 1156 sep->se_pids = malloc(sep->se_maxchild * sizeof(*sep->se_pids)); 1157 if (sep->se_pids == NULL) { 1158 syslog(LOG_ERR, "Out of memory."); 1159 exit(EX_OSERR); 1160 } 1161 } 1162 argc = 0; 1163 for (arg = skip(&cp); cp; arg = skip(&cp)) 1164 if (argc < MAXARGV) { 1165 sep->se_argv[argc++] = newstr(arg); 1166 } else { 1167 syslog(LOG_ERR, 1168 "%s: too many arguments for service %s", 1169 CONFIG, sep->se_service); 1170 goto more; 1171 } 1172 while (argc <= MAXARGV) 1173 sep->se_argv[argc++] = NULL; 1174 return (sep); 1175 } 1176 1177 void 1178 freeconfig(cp) 1179 struct servtab *cp; 1180 { 1181 int i; 1182 1183 if (cp->se_service) 1184 free(cp->se_service); 1185 if (cp->se_proto) 1186 free(cp->se_proto); 1187 if (cp->se_user) 1188 free(cp->se_user); 1189 if (cp->se_server) 1190 free(cp->se_server); 1191 if (cp->se_pids) 1192 free(cp->se_pids); 1193 for (i = 0; i < MAXARGV; i++) 1194 if (cp->se_argv[i]) 1195 free(cp->se_argv[i]); 1196 } 1197 1198 1199 /* 1200 * Safe skip - if skip returns null, log a syntax error in the 1201 * configuration file and exit. 1202 */ 1203 char * 1204 sskip(cpp) 1205 char **cpp; 1206 { 1207 char *cp; 1208 1209 cp = skip(cpp); 1210 if (cp == NULL) { 1211 syslog(LOG_ERR, "%s: syntax error", CONFIG); 1212 exit(EX_DATAERR); 1213 } 1214 return (cp); 1215 } 1216 1217 char * 1218 skip(cpp) 1219 char **cpp; 1220 { 1221 char *cp = *cpp; 1222 char *start; 1223 char quote = '\0'; 1224 1225 again: 1226 while (*cp == ' ' || *cp == '\t') 1227 cp++; 1228 if (*cp == '\0') { 1229 int c; 1230 1231 c = getc(fconfig); 1232 (void) ungetc(c, fconfig); 1233 if (c == ' ' || c == '\t') 1234 if ((cp = nextline(fconfig))) 1235 goto again; 1236 *cpp = (char *)0; 1237 return ((char *)0); 1238 } 1239 if (*cp == '"' || *cp == '\'') 1240 quote = *cp++; 1241 start = cp; 1242 if (quote) 1243 while (*cp && *cp != quote) 1244 cp++; 1245 else 1246 while (*cp && *cp != ' ' && *cp != '\t') 1247 cp++; 1248 if (*cp != '\0') 1249 *cp++ = '\0'; 1250 *cpp = cp; 1251 return (start); 1252 } 1253 1254 char * 1255 nextline(fd) 1256 FILE *fd; 1257 { 1258 char *cp; 1259 1260 if (fgets(line, sizeof (line), fd) == NULL) 1261 return ((char *)0); 1262 cp = strchr(line, '\n'); 1263 if (cp) 1264 *cp = '\0'; 1265 return (line); 1266 } 1267 1268 char * 1269 newstr(cp) 1270 char *cp; 1271 { 1272 if ((cp = strdup(cp ? cp : ""))) 1273 return (cp); 1274 syslog(LOG_ERR, "strdup: %m"); 1275 exit(EX_OSERR); 1276 } 1277 1278 #ifdef OLD_SETPROCTITLE 1279 void 1280 inetd_setproctitle(a, s) 1281 char *a; 1282 int s; 1283 { 1284 int size; 1285 char *cp; 1286 struct sockaddr_in sin; 1287 char buf[80]; 1288 1289 cp = Argv[0]; 1290 size = sizeof(sin); 1291 if (getpeername(s, (struct sockaddr *)&sin, &size) == 0) 1292 (void) sprintf(buf, "-%s [%s]", a, inet_ntoa(sin.sin_addr)); 1293 else 1294 (void) sprintf(buf, "-%s", a); 1295 strncpy(cp, buf, LastArg - cp); 1296 cp += strlen(cp); 1297 while (cp < LastArg) 1298 *cp++ = ' '; 1299 } 1300 #else 1301 void 1302 inetd_setproctitle(a, s) 1303 char *a; 1304 int s; 1305 { 1306 int size; 1307 struct sockaddr_in sin; 1308 char buf[80]; 1309 1310 size = sizeof(sin); 1311 if (getpeername(s, (struct sockaddr *)&sin, &size) == 0) 1312 (void) sprintf(buf, "%s [%s]", a, inet_ntoa(sin.sin_addr)); 1313 else 1314 (void) sprintf(buf, "%s", a); 1315 setproctitle("%s", buf); 1316 } 1317 #endif 1318 1319 1320 /* 1321 * Internet services provided internally by inetd: 1322 */ 1323 #define BUFSIZE 8192 1324 1325 /* ARGSUSED */ 1326 void 1327 echo_stream(s, sep) /* Echo service -- echo data back */ 1328 int s; 1329 struct servtab *sep; 1330 { 1331 char buffer[BUFSIZE]; 1332 int i; 1333 1334 inetd_setproctitle(sep->se_service, s); 1335 while ((i = read(s, buffer, sizeof(buffer))) > 0 && 1336 write(s, buffer, i) > 0) 1337 ; 1338 exit(0); 1339 } 1340 1341 int check_loop(sin, sep) 1342 struct sockaddr_in *sin; 1343 struct servtab *sep; 1344 { 1345 struct servtab *se2; 1346 1347 for (se2 = servtab; se2; se2 = se2->se_next) { 1348 if (!se2->se_bi || se2->se_socktype != SOCK_DGRAM) 1349 continue; 1350 1351 if (sin->sin_port == se2->se_ctrladdr.sin_port) { 1352 syslog(LOG_WARNING, 1353 "%s/%s:%s/%s loop request REFUSED from %s", 1354 sep->se_service, sep->se_proto, 1355 se2->se_service, se2->se_proto, 1356 inet_ntoa(sin->sin_addr)); 1357 return 1; 1358 } 1359 } 1360 return 0; 1361 } 1362 1363 /* ARGSUSED */ 1364 void 1365 echo_dg(s, sep) /* Echo service -- echo data back */ 1366 int s; 1367 struct servtab *sep; 1368 { 1369 char buffer[BUFSIZE]; 1370 int i, size; 1371 struct sockaddr_in sin; 1372 1373 size = sizeof(sin); 1374 if ((i = recvfrom(s, buffer, sizeof(buffer), 0, 1375 (struct sockaddr *)&sin, &size)) < 0) 1376 return; 1377 1378 if (check_loop(&sin, sep)) 1379 return; 1380 1381 (void) sendto(s, buffer, i, 0, (struct sockaddr *)&sin, 1382 sizeof(sin)); 1383 } 1384 1385 /* ARGSUSED */ 1386 void 1387 discard_stream(s, sep) /* Discard service -- ignore data */ 1388 int s; 1389 struct servtab *sep; 1390 { 1391 int ret; 1392 char buffer[BUFSIZE]; 1393 1394 inetd_setproctitle(sep->se_service, s); 1395 while (1) { 1396 while ((ret = read(s, buffer, sizeof(buffer))) > 0) 1397 ; 1398 if (ret == 0 || errno != EINTR) 1399 break; 1400 } 1401 exit(0); 1402 } 1403 1404 /* ARGSUSED */ 1405 void 1406 discard_dg(s, sep) /* Discard service -- ignore data */ 1407 int s; 1408 struct servtab *sep; 1409 { 1410 char buffer[BUFSIZE]; 1411 1412 (void) read(s, buffer, sizeof(buffer)); 1413 } 1414 1415 #include <ctype.h> 1416 #define LINESIZ 72 1417 char ring[128]; 1418 char *endring; 1419 1420 void 1421 initring() 1422 { 1423 int i; 1424 1425 endring = ring; 1426 1427 for (i = 0; i <= 128; ++i) 1428 if (isprint(i)) 1429 *endring++ = i; 1430 } 1431 1432 /* ARGSUSED */ 1433 void 1434 chargen_stream(s, sep) /* Character generator */ 1435 int s; 1436 struct servtab *sep; 1437 { 1438 int len; 1439 char *rs, text[LINESIZ+2]; 1440 1441 inetd_setproctitle(sep->se_service, s); 1442 1443 if (!endring) { 1444 initring(); 1445 rs = ring; 1446 } 1447 1448 text[LINESIZ] = '\r'; 1449 text[LINESIZ + 1] = '\n'; 1450 for (rs = ring;;) { 1451 if ((len = endring - rs) >= LINESIZ) 1452 memmove(text, rs, LINESIZ); 1453 else { 1454 memmove(text, rs, len); 1455 memmove(text + len, ring, LINESIZ - len); 1456 } 1457 if (++rs == endring) 1458 rs = ring; 1459 if (write(s, text, sizeof(text)) != sizeof(text)) 1460 break; 1461 } 1462 exit(0); 1463 } 1464 1465 /* ARGSUSED */ 1466 void 1467 chargen_dg(s, sep) /* Character generator */ 1468 int s; 1469 struct servtab *sep; 1470 { 1471 struct sockaddr_in sin; 1472 static char *rs; 1473 int len, size; 1474 char text[LINESIZ+2]; 1475 1476 if (endring == 0) { 1477 initring(); 1478 rs = ring; 1479 } 1480 1481 size = sizeof(sin); 1482 if (recvfrom(s, text, sizeof(text), 0, 1483 (struct sockaddr *)&sin, &size) < 0) 1484 return; 1485 1486 if (check_loop(&sin, sep)) 1487 return; 1488 1489 if ((len = endring - rs) >= LINESIZ) 1490 memmove(text, rs, LINESIZ); 1491 else { 1492 memmove(text, rs, len); 1493 memmove(text + len, ring, LINESIZ - len); 1494 } 1495 if (++rs == endring) 1496 rs = ring; 1497 text[LINESIZ] = '\r'; 1498 text[LINESIZ + 1] = '\n'; 1499 (void) sendto(s, text, sizeof(text), 0, 1500 (struct sockaddr *)&sin, sizeof(sin)); 1501 } 1502 1503 /* 1504 * Return a machine readable date and time, in the form of the 1505 * number of seconds since midnight, Jan 1, 1900. Since gettimeofday 1506 * returns the number of seconds since midnight, Jan 1, 1970, 1507 * we must add 2208988800 seconds to this figure to make up for 1508 * some seventy years Bell Labs was asleep. 1509 */ 1510 1511 long 1512 machtime() 1513 { 1514 struct timeval tv; 1515 1516 if (gettimeofday(&tv, (struct timezone *)0) < 0) { 1517 if (debug) 1518 fprintf(stderr, "Unable to get time of day\n"); 1519 return (0L); 1520 } 1521 #define OFFSET ((u_long)25567 * 24*60*60) 1522 return (htonl((long)(tv.tv_sec + OFFSET))); 1523 #undef OFFSET 1524 } 1525 1526 /* ARGSUSED */ 1527 void 1528 machtime_stream(s, sep) 1529 int s; 1530 struct servtab *sep; 1531 { 1532 long result; 1533 1534 result = machtime(); 1535 (void) write(s, (char *) &result, sizeof(result)); 1536 } 1537 1538 /* ARGSUSED */ 1539 void 1540 machtime_dg(s, sep) 1541 int s; 1542 struct servtab *sep; 1543 { 1544 long result; 1545 struct sockaddr_in sin; 1546 int size; 1547 1548 size = sizeof(sin); 1549 if (recvfrom(s, (char *)&result, sizeof(result), 0, 1550 (struct sockaddr *)&sin, &size) < 0) 1551 return; 1552 1553 if (check_loop(&sin, sep)) 1554 return; 1555 1556 result = machtime(); 1557 (void) sendto(s, (char *) &result, sizeof(result), 0, 1558 (struct sockaddr *)&sin, sizeof(sin)); 1559 } 1560 1561 /* ARGSUSED */ 1562 void 1563 daytime_stream(s, sep) /* Return human-readable time of day */ 1564 int s; 1565 struct servtab *sep; 1566 { 1567 char buffer[256]; 1568 time_t clock; 1569 1570 clock = time((time_t *) 0); 1571 1572 (void) sprintf(buffer, "%.24s\r\n", ctime(&clock)); 1573 (void) write(s, buffer, strlen(buffer)); 1574 } 1575 1576 /* ARGSUSED */ 1577 void 1578 daytime_dg(s, sep) /* Return human-readable time of day */ 1579 int s; 1580 struct servtab *sep; 1581 { 1582 char buffer[256]; 1583 time_t clock; 1584 struct sockaddr_in sin; 1585 int size; 1586 1587 clock = time((time_t *) 0); 1588 1589 size = sizeof(sin); 1590 if (recvfrom(s, buffer, sizeof(buffer), 0, 1591 (struct sockaddr *)&sin, &size) < 0) 1592 return; 1593 1594 if (check_loop(&sin, sep)) 1595 return; 1596 1597 (void) sprintf(buffer, "%.24s\r\n", ctime(&clock)); 1598 (void) sendto(s, buffer, strlen(buffer), 0, 1599 (struct sockaddr *)&sin, sizeof(sin)); 1600 } 1601 1602 /* 1603 * print_service: 1604 * Dump relevant information to stderr 1605 */ 1606 void 1607 print_service(action, sep) 1608 char *action; 1609 struct servtab *sep; 1610 { 1611 fprintf(stderr, 1612 "%s: %s proto=%s accept=%d max=%d user=%s builtin=%x server=%s\n", 1613 action, sep->se_service, sep->se_proto, 1614 sep->se_accept, sep->se_maxchild, sep->se_user, 1615 (int)sep->se_bi, sep->se_server); 1616 } 1617 1618 /* 1619 * Based on TCPMUX.C by Mark K. Lottor November 1988 1620 * sri-nic::ps:<mkl>tcpmux.c 1621 */ 1622 1623 1624 static int /* # of characters upto \r,\n or \0 */ 1625 getline(fd, buf, len) 1626 int fd; 1627 char *buf; 1628 int len; 1629 { 1630 int count = 0, n; 1631 1632 do { 1633 n = read(fd, buf, len-count); 1634 if (n == 0) 1635 return (count); 1636 if (n < 0) 1637 return (-1); 1638 while (--n >= 0) { 1639 if (*buf == '\r' || *buf == '\n' || *buf == '\0') 1640 return (count); 1641 count++; 1642 buf++; 1643 } 1644 } while (count < len); 1645 return (count); 1646 } 1647 1648 #define MAX_SERV_LEN (256+2) /* 2 bytes for \r\n */ 1649 1650 #define strwrite(fd, buf) (void) write(fd, buf, sizeof(buf)-1) 1651 1652 struct servtab * 1653 tcpmux(s) 1654 int s; 1655 { 1656 struct servtab *sep; 1657 char service[MAX_SERV_LEN+1]; 1658 int len; 1659 1660 /* Get requested service name */ 1661 if ((len = getline(s, service, MAX_SERV_LEN)) < 0) { 1662 strwrite(s, "-Error reading service name\r\n"); 1663 return (NULL); 1664 } 1665 service[len] = '\0'; 1666 1667 if (debug) 1668 fprintf(stderr, "tcpmux: someone wants %s\n", service); 1669 1670 /* 1671 * Help is a required command, and lists available services, 1672 * one per line. 1673 */ 1674 if (!strcasecmp(service, "help")) { 1675 for (sep = servtab; sep; sep = sep->se_next) { 1676 if (!ISMUX(sep)) 1677 continue; 1678 (void)write(s,sep->se_service,strlen(sep->se_service)); 1679 strwrite(s, "\r\n"); 1680 } 1681 return (NULL); 1682 } 1683 1684 /* Try matching a service in inetd.conf with the request */ 1685 for (sep = servtab; sep; sep = sep->se_next) { 1686 if (!ISMUX(sep)) 1687 continue; 1688 if (!strcasecmp(service, sep->se_service)) { 1689 if (ISMUXPLUS(sep)) { 1690 strwrite(s, "+Go\r\n"); 1691 } 1692 return (sep); 1693 } 1694 } 1695 strwrite(s, "-Service not available\r\n"); 1696 return (NULL); 1697 } 1698