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