networking/inetd.c

   1 /* vi: set sw=4 ts=4: */
   2 /*      $Slackware: inetd.c 1.79s 2001/02/06 13:18:00 volkerdi Exp $    */
   3 /*      $OpenBSD: inetd.c,v 1.79 2001/01/30 08:30:57 deraadt Exp $      */
   4 /*      $NetBSD: inetd.c,v 1.11 1996/02/22 11:14:41 mycroft Exp $       */
   5 /* Busybox port by Vladimir Oleynik (C) 2001-2005 <dzo@simtreas.ru>     */
   6 /*
   7  * Copyright (c) 1983,1991 The Regents of the University of California.
   8  * All rights reserved.
   9  *
  10  * Redistribution and use in source and binary forms, with or without
  11  * modification, are permitted provided that the following conditions
  12  * are met:
  13  * 1. Redistributions of source code must retain the above copyright
  14  *    notice, this list of conditions and the following disclaimer.
  15  * 2. Redistributions in binary form must reproduce the above copyright
  16  *    notice, this list of conditions and the following disclaimer in the
  17  *    documentation and/or other materials provided with the distribution.
  18  * 3. All advertising materials mentioning features or use of this software
  19  *    must display the following acknowledgement:
  20  *      This product includes software developed by the University of
  21  *      California, Berkeley and its contributors.
  22  * 4. Neither the name of the University nor the names of its contributors
  23  *    may be used to endorse or promote products derived from this software
  24  *    without specific prior written permission.
  25  *
  26  * THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS "AS IS" AND
  27  * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
  28  * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
  29  * ARE DISCLAIMED.  IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE
  30  * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
  31  * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
  32  * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
  33  * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
  34  * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
  35  * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
  36  * SUCH DAMAGE.
  37  */
  38
  39 /* Inetd - Internet super-server
  40  *
  41  * This program invokes all internet services as needed.
  42  * connection-oriented services are invoked each time a
  43  * connection is made, by creating a process.  This process
  44  * is passed the connection as file descriptor 0 and is
  45  * expected to do a getpeername to find out the source host
  46  * and port.
  47  *
  48  * Datagram oriented services are invoked when a datagram
  49  * arrives; a process is created and passed a pending message
  50  * on file descriptor 0.  Datagram servers may either connect
  51  * to their peer, freeing up the original socket for inetd
  52  * to receive further messages on, or "take over the socket",
  53  * processing all arriving datagrams and, eventually, timing
  54  * out.  The first type of server is said to be "multi-threaded";
  55  * the second type of server "single-threaded".
  56  *
  57  * Inetd uses a configuration file which is read at startup
  58  * and, possibly, at some later time in response to a hangup signal.
  59  * The configuration file is "free format" with fields given in the
  60  * order shown below.  Continuation lines for an entry must begin with
  61  * a space or tab.  All fields must be present in each entry.
  62  *
  63  *      service name                    must be in /etc/services
  64  *      socket type                     stream/dgram/raw/rdm/seqpacket
  65  *      protocol                        must be in /etc/protocols
  66  *      wait/nowait[.max]               single-threaded/multi-threaded, max #
  67  *      user[.group] or user[:group]    user/group to run daemon as
  68  *      server program                  full path name
  69  *      server program arguments        maximum of MAXARGS (20)
  70  *
  71  * For RPC services
  72  *      service name/version            must be in /etc/rpc
  73  *      socket type                     stream/dgram/raw/rdm/seqpacket
  74  *      protocol                        must be in /etc/protocols
  75  *      wait/nowait[.max]               single-threaded/multi-threaded
  76  *      user[.group] or user[:group]    user to run daemon as
  77  *      server program                  full path name
  78  *      server program arguments        maximum of MAXARGS (20)
  79  *
  80  * For non-RPC services, the "service name" can be of the form
  81  * hostaddress:servicename, in which case the hostaddress is used
  82  * as the host portion of the address to listen on.  If hostaddress
  83  * consists of a single `*' character, INADDR_ANY is used.
  84  *
  85  * A line can also consist of just
  86  *      hostaddress:
  87  * where hostaddress is as in the preceding paragraph.  Such a line must
  88  * have no further fields; the specified hostaddress is remembered and
  89  * used for all further lines that have no hostaddress specified,
  90  * until the next such line (or EOF).  (This is why * is provided to
  91  * allow explicit specification of INADDR_ANY.)  A line
  92  *      *:
  93  * is implicitly in effect at the beginning of the file.
  94  *
  95  * The hostaddress specifier may (and often will) contain dots;
  96  * the service name must not.
  97  *
  98  * For RPC services, host-address specifiers are accepted and will
  99  * work to some extent; however, because of limitations in the
 100  * portmapper interface, it will not work to try to give more than
 101  * one line for any given RPC service, even if the host-address
 102  * specifiers are different.
 103  *
 104  * Comment lines are indicated by a `#' in column 1.
 105  */
 106
 107 /* inetd rules for passing file descriptors to children
 108  * (http://www.freebsd.org/cgi/man.cgi?query=inetd):
 109  *
 110  * The wait/nowait entry specifies whether the server that is invoked by
 111  * inetd will take over the socket associated with the service access point,
 112  * and thus whether inetd should wait for the server to exit before listen-
 113  * ing for new service requests.  Datagram servers must use "wait", as
 114  * they are always invoked with the original datagram socket bound to the
 115  * specified service address.  These servers must read at least one datagram
 116  * from the socket before exiting.  If a datagram server connects to its
 117  * peer, freeing the socket so inetd can receive further messages on the
 118  * socket, it is said to be a "multi-threaded" server; it should read one
 119  * datagram from the socket and create a new socket connected to the peer.
 120  * It should fork, and the parent should then exit to allow inetd to check
 121  * for new service requests to spawn new servers.  Datagram servers which
 122  * process all incoming datagrams on a socket and eventually time out are
 123  * said to be "single-threaded".  The comsat(8), (biff(1)) and talkd(8)
 124  * utilities are both examples of the latter type of datagram server.  The
 125  * tftpd(8) utility is an example of a multi-threaded datagram server.
 126  *
 127  * Servers using stream sockets generally are multi-threaded and use the
 128  * "nowait" entry. Connection requests for these services are accepted by
 129  * inetd, and the server is given only the newly-accepted socket connected
 130  * to a client of the service.  Most stream-based services operate in this
 131  * manner.  Stream-based servers that use "wait" are started with the lis-
 132  * tening service socket, and must accept at least one connection request
 133  * before exiting.  Such a server would normally accept and process incoming
 134  * connection requests until a timeout.
 135  */
 136
 137 /* Here's the scoop concerning the user[.:]group feature:
 138  *
 139  * 1) set-group-option off.
 140  *
 141  *      a) user = root: NO setuid() or setgid() is done
 142  *
 143  *      b) other:       setgid(primary group as found in passwd)
 144  *                      initgroups(name, primary group)
 145  *                      setuid()
 146  *
 147  * 2) set-group-option on.
 148  *
 149  *      a) user = root: setgid(specified group)
 150  *                      NO initgroups()
 151  *                      NO setuid()
 152  *
 153  *      b) other:       setgid(specified group)
 154  *                      initgroups(name, specified group)
 155  *                      setuid()
 156  */
 157
 158 #include "libbb.h"
 159 #include <syslog.h>
 160 #include <sys/un.h>
 161
 162 //#define ENABLE_FEATURE_INETD_RPC 1
 163 //#define ENABLE_FEATURE_INETD_SUPPORT_BUILTIN_ECHO 1
 164 //#define ENABLE_FEATURE_INETD_SUPPORT_BUILTIN_DISCARD 1
 165 //#define ENABLE_FEATURE_INETD_SUPPORT_BUILTIN_TIME 1
 166 //#define ENABLE_FEATURE_INETD_SUPPORT_BUILTIN_DAYTIME 1
 167 //#define ENABLE_FEATURE_INETD_SUPPORT_BUILTIN_CHARGEN 1
 168 //#define ENABLE_FEATURE_IPV6 1
 169
 170 #if ENABLE_FEATURE_INETD_RPC
 171 #include <rpc/rpc.h>
 172 #include <rpc/pmap_clnt.h>
 173 #endif
 174
 175 extern char **environ;
 176
 177
 178 #define _PATH_INETDPID  "/var/run/inetd.pid"
 179
 180 #define CNT_INTVL       60              /* servers in CNT_INTVL sec. */
 181 #define RETRYTIME       (60*10)         /* retry after bind or server fail */
 182
 183 #ifndef RLIMIT_NOFILE
 184 #define RLIMIT_NOFILE   RLIMIT_OFILE
 185 #endif
 186
 187 #ifndef OPEN_MAX
 188 #define OPEN_MAX        64
 189 #endif
 190
 191 /* Reserve some descriptors, 3 stdio + at least: 1 log, 1 conf. file */
 192 #define FD_MARGIN       8
 193
 194 /* Check unsupporting builtin */
 195 #if ENABLE_FEATURE_INETD_SUPPORT_BUILTIN_ECHO || \
 196         ENABLE_FEATURE_INETD_SUPPORT_BUILTIN_DISCARD || \
 197         ENABLE_FEATURE_INETD_SUPPORT_BUILTIN_TIME || \
 198         ENABLE_FEATURE_INETD_SUPPORT_BUILTIN_DAYTIME || \
 199         ENABLE_FEATURE_INETD_SUPPORT_BUILTIN_CHARGEN
 200 # define INETD_FEATURE_ENABLED
 201 #endif
 202
 203 #if ENABLE_FEATURE_INETD_SUPPORT_BUILTIN_ECHO || \
 204         ENABLE_FEATURE_INETD_SUPPORT_BUILTIN_DISCARD || \
 205         ENABLE_FEATURE_INETD_SUPPORT_BUILTIN_CHARGEN
 206 # define INETD_SETPROCTITLE
 207 #endif
 208
 209 typedef int8_t socktype_t;
 210 typedef int8_t family_t;
 211 struct BUG_too_small {
 212         char BUG_socktype_t_too_small[(0
 213                         | SOCK_STREAM
 214                         | SOCK_DGRAM
 215                         | SOCK_RDM
 216                         | SOCK_SEQPACKET
 217                         | SOCK_RAW) <= 127 ? 1 : -1];
 218         char BUG_family_t_too_small[(0
 219                         | AF_INET
 220                         | AF_INET6
 221                         | AF_UNIX) <= 127 ? 1 : -1];
 222 };
 223
 224 typedef struct servtab_t {
 225         /* The most frequently referenced one: */
 226         int se_fd;                            /* open descriptor */
 227         /* NB: 'biggest fields last' saves on code size (~250 bytes) */
 228         char *se_hostaddr;                    /* host address to listen on */
 229         char *se_service;                     /* name of service */
 230         char *se_proto;                       /* protocol used */
 231 #if ENABLE_FEATURE_INETD_RPC
 232         int se_rpcprog;                       /* rpc program number */
 233         int se_rpcversl;                      /* rpc program lowest version */
 234         int se_rpcversh;                      /* rpc program highest version */
 235 #define isrpcservice(sep)       ((sep)->se_rpcversl != 0)
 236 #else
 237 #define isrpcservice(sep)       0
 238 #endif
 239         pid_t se_wait;                        /* single threaded server */
 240         socktype_t se_socktype;               /* type of socket to use */
 241         family_t se_family;                   /* address family */
 242         smallint se_checked;                  /* looked at during merge */
 243         char *se_user;                        /* user name to run as */
 244         char *se_group;                       /* group name to run as */
 245 #ifdef INETD_FEATURE_ENABLED
 246         const struct builtin *se_bi;          /* if built-in, description */
 247 #endif
 248         int se_ctrladdr_size;
 249         int se_max;                           /* max # of instances of this service */
 250         int se_count;                         /* number started since se_time */
 251         struct servtab_t *se_next;
 252         struct timeval se_time;               /* start of se_count */
 253         char *se_server;                      /* server program */
 254 #define MAXARGV 20
 255         char *se_argv[MAXARGV + 1];           /* program arguments */
 256         union {
 257                 struct sockaddr se_un_ctrladdr;
 258                 struct sockaddr_in se_un_ctrladdr_in;
 259 #if ENABLE_FEATURE_IPV6
 260                 struct sockaddr_in6 se_un_ctrladdr_in6;
 261 #endif
 262                 struct sockaddr_un se_un_ctrladdr_un;
 263         } se_un;                              /* bound address */
 264 #define se_ctrladdr     se_un.se_un_ctrladdr
 265 #define se_ctrladdr_in  se_un.se_un_ctrladdr_in
 266 #define se_ctrladdr_in6 se_un.se_un_ctrladdr_in6
 267 #define se_ctrladdr_un  se_un.se_un_ctrladdr_un
 268 } servtab_t;
 269
 270 #ifdef INETD_FEATURE_ENABLED
 271 struct builtin {
 272         const char *bi_service;               /* internally provided service name */
 273         socktype_t bi_socktype;               /* type of socket supported */
 274         uint8_t bi_fork;                      /* 1 if should fork before call */
 275 // Commented since it is always 0
 276 //      uint8_t bi_wait;                      /* 1 if should wait for child */
 277         void (*bi_fn) (int, servtab_t *);
 278 };
 279
 280                 /* Echo received data */
 281 #if ENABLE_FEATURE_INETD_SUPPORT_BUILTIN_ECHO
 282 static void echo_stream(int, servtab_t *);
 283 static void echo_dg(int, servtab_t *);
 284 #endif
 285                 /* Internet /dev/null */
 286 #if ENABLE_FEATURE_INETD_SUPPORT_BUILTIN_DISCARD
 287 static void discard_stream(int, servtab_t *);
 288 static void discard_dg(int, servtab_t *);
 289 #endif
 290                 /* Return 32 bit time since 1900 */
 291 #if ENABLE_FEATURE_INETD_SUPPORT_BUILTIN_TIME
 292 static void machtime_stream(int, servtab_t *);
 293 static void machtime_dg(int, servtab_t *);
 294 #endif
 295                 /* Return human-readable time */
 296 #if ENABLE_FEATURE_INETD_SUPPORT_BUILTIN_DAYTIME
 297 static void daytime_stream(int, servtab_t *);
 298 static void daytime_dg(int, servtab_t *);
 299 #endif
 300                 /* Familiar character generator */
 301 #if ENABLE_FEATURE_INETD_SUPPORT_BUILTIN_CHARGEN
 302 static void chargen_stream(int, servtab_t *);
 303 static void chargen_dg(int, servtab_t *);
 304 #endif
 305
 306 static const struct builtin builtins[] = {
 307 #if ENABLE_FEATURE_INETD_SUPPORT_BUILTIN_ECHO
 308         /* Echo received data */
 309         {"echo", SOCK_STREAM, 1, echo_stream,},
 310         {"echo", SOCK_DGRAM, 0, echo_dg,},
 311 #endif
 312 #if ENABLE_FEATURE_INETD_SUPPORT_BUILTIN_DISCARD
 313         /* Internet /dev/null */
 314         {"discard", SOCK_STREAM, 1, discard_stream,},
 315         {"discard", SOCK_DGRAM, 0, discard_dg,},
 316 #endif
 317 #if ENABLE_FEATURE_INETD_SUPPORT_BUILTIN_TIME
 318         /* Return 32 bit time since 1900 */
 319         {"time", SOCK_STREAM, 0, machtime_stream,},
 320         {"time", SOCK_DGRAM, 0, machtime_dg,},
 321 #endif
 322 #if ENABLE_FEATURE_INETD_SUPPORT_BUILTIN_DAYTIME
 323         /* Return human-readable time */
 324         {"daytime", SOCK_STREAM, 0, daytime_stream,},
 325         {"daytime", SOCK_DGRAM, 0, daytime_dg,},
 326 #endif
 327 #if ENABLE_FEATURE_INETD_SUPPORT_BUILTIN_CHARGEN
 328         /* Familiar character generator */
 329         {"chargen", SOCK_STREAM, 1, chargen_stream,},
 330         {"chargen", SOCK_DGRAM, 0, chargen_dg,},
 331 #endif
 332         { /* zero filled */ }
 333 };
 334 #endif /* INETD_FEATURE_ENABLED */
 335
 336 struct globals {
 337         rlim_t rlim_ofile_cur;
 338         struct rlimit rlim_ofile;
 339         servtab_t *servtab;
 340         int global_queuelen;
 341         int nsock;
 342         int maxsock;
 343         int toomany;
 344         int timingout;
 345         struct servent *sp;
 346         uid_t uid;
 347         const char *config_filename;
 348         FILE *fconfig;
 349         char *defhost;
 350 #ifdef INETD_SETPROCTITLE
 351         char **Argv;
 352         char *LastArg;
 353 #endif
 354 #if ENABLE_FEATURE_INETD_SUPPORT_BUILTIN_CHARGEN
 355         char *endring;
 356         char *ringpos;
 357         char ring[128];
 358 #endif
 359         fd_set allsock;
 360         /* Used only in nextline() */
 361         char line[80];          /* at least 80, see LINE_SIZE */
 362 };
 363 #define G (*(struct globals*)&bb_common_bufsiz1)
 364 enum { LINE_SIZE = COMMON_BUFSIZE - offsetof(struct globals, line) };
 365 struct BUG_G_too_big {
 366         char BUG_G_too_big[sizeof(G) <= COMMON_BUFSIZE ? 1 : -1];
 367 };
 368 #define rlim_ofile_cur  (G.rlim_ofile_cur )
 369 #define rlim_ofile      (G.rlim_ofile     )
 370 #define servtab         (G.servtab        )
 371 #define global_queuelen (G.global_queuelen)
 372 #define nsock           (G.nsock          )
 373 #define maxsock         (G.maxsock        )
 374 #define toomany         (G.toomany        )
 375 #define timingout       (G.timingout      )
 376 #define sp              (G.sp             )
 377 #define uid             (G.uid            )
 378 #define config_filename (G.config_filename)
 379 #define fconfig         (G.fconfig        )
 380 #define defhost         (G.defhost        )
 381 #define Argv            (G.Argv           )
 382 #define LastArg         (G.LastArg        )
 383 #define endring         (G.endring        )
 384 #define ringpos         (G.ringpos        )
 385 #define ring            (G.ring           )
 386 #define allsock         (G.allsock        )
 387 #define line            (G.line           )
 388 #define INIT_G() do { \
 389         rlim_ofile_cur = OPEN_MAX; \
 390         global_queuelen = 128; \
 391         config_filename = "/etc/inetd.conf"; \
 392 } while (0)
 393
 394 /* xstrdup(NULL) returns NULL, but this one
 395  * will return newly-allocated "" if called with NULL arg
 396  * TODO: audit whether this makes any real difference
 397  */
 398 static char *xxstrdup(char *cp)
 399 {
 400         return xstrdup(cp ? cp : "");
 401 }
 402
 403 static int setconfig(void)
 404 {
 405         free(defhost);
 406         defhost = xstrdup("*");
 407         if (fconfig != NULL) {
 408                 fseek(fconfig, 0L, SEEK_SET);
 409                 return 1;
 410         }
 411         fconfig = fopen(config_filename, "r");
 412         return (fconfig != NULL);
 413 }
 414
 415 static void endconfig(void)
 416 {
 417         if (fconfig) {
 418                 (void) fclose(fconfig);
 419                 fconfig = NULL;
 420         }
 421         free(defhost);
 422         defhost = 0;
 423 }
 424
 425 #if ENABLE_FEATURE_INETD_RPC
 426 static void register_rpc(servtab_t *sep)
 427 {
 428         int n;
 429         struct sockaddr_in ir_sin;
 430         struct protoent *pp;
 431         socklen_t size;
 432
 433         if ((pp = getprotobyname(sep->se_proto + 4)) == NULL) {
 434                 bb_perror_msg("%s: getproto", sep->se_proto);
 435                 return;
 436         }
 437         size = sizeof ir_sin;
 438         if (getsockname(sep->se_fd, (struct sockaddr *) &ir_sin, &size) < 0) {
 439                 bb_perror_msg("%s/%s: getsockname",
 440                                 sep->se_service, sep->se_proto);
 441                 return;
 442         }
 443
 444         for (n = sep->se_rpcversl; n <= sep->se_rpcversh; n++) {
 445                 (void) pmap_unset(sep->se_rpcprog, n);
 446                 if (!pmap_set(sep->se_rpcprog, n, pp->p_proto, ntohs(ir_sin.sin_port)))
 447                         bb_perror_msg("%s %s: pmap_set: %u %u %u %u",
 448                                         sep->se_service, sep->se_proto,
 449                                         sep->se_rpcprog, n, pp->p_proto, ntohs(ir_sin.sin_port));
 450         }
 451 }
 452
 453 static void unregister_rpc(servtab_t *sep)
 454 {
 455         int n;
 456
 457         for (n = sep->se_rpcversl; n <= sep->se_rpcversh; n++) {
 458                 if (!pmap_unset(sep->se_rpcprog, n))
 459                         bb_error_msg("pmap_unset(%u, %u)", sep->se_rpcprog, n);
 460         }
 461 }
 462 #endif /* FEATURE_INETD_RPC */
 463
 464 static void freeconfig(servtab_t *cp)
 465 {
 466         int i;
 467
 468         free(cp->se_hostaddr);
 469         free(cp->se_service);
 470         free(cp->se_proto);
 471         free(cp->se_user);
 472         free(cp->se_group);
 473         free(cp->se_server);
 474         for (i = 0; i < MAXARGV; i++)
 475                 free(cp->se_argv[i]);
 476 }
 477
 478 static int bump_nofile(void)
 479 {
 480 #define FD_CHUNK        32
 481
 482         struct rlimit rl;
 483
 484         if (getrlimit(RLIMIT_NOFILE, &rl) < 0) {
 485                 bb_perror_msg("getrlimit");
 486                 return -1;
 487         }
 488         rl.rlim_cur = MIN(rl.rlim_max, rl.rlim_cur + FD_CHUNK);
 489         rl.rlim_cur = MIN(FD_SETSIZE, rl.rlim_cur + FD_CHUNK);
 490         if (rl.rlim_cur <= rlim_ofile_cur) {
 491                 bb_error_msg("bump_nofile: cannot extend file limit, max = %d",
 492                                                 (int) rl.rlim_cur);
 493                 return -1;
 494         }
 495
 496         if (setrlimit(RLIMIT_NOFILE, &rl) < 0) {
 497                 bb_perror_msg("setrlimit");
 498                 return -1;
 499         }
 500
 501         rlim_ofile_cur = rl.rlim_cur;
 502         return 0;
 503 }
 504
 505 static void setup(servtab_t *sep)
 506 {
 507         int r;
 508
 509         sep->se_fd = socket(sep->se_family, sep->se_socktype, 0);
 510         if (sep->se_fd < 0) {
 511                 bb_perror_msg("%s/%s: socket", sep->se_service, sep->se_proto);
 512                 return;
 513         }
 514         setsockopt_reuseaddr(sep->se_fd);
 515
 516 #if ENABLE_FEATURE_INETD_RPC
 517         if (isrpcservice(sep)) {
 518                 struct passwd *pwd;
 519
 520                 /*
 521                  * for RPC services, attempt to use a reserved port
 522                  * if they are going to be running as root.
 523                  *
 524                  * Also, zero out the port for all RPC services; let bind()
 525                  * find one.
 526                  */
 527                 sep->se_ctrladdr_in.sin_port = 0;
 528                 if (sep->se_user && (pwd = getpwnam(sep->se_user)) &&
 529                                 pwd->pw_uid == 0 && uid == 0)
 530                         r = bindresvport(sep->se_fd, &sep->se_ctrladdr_in);
 531                 else {
 532                         r = bind(sep->se_fd, &sep->se_ctrladdr, sep->se_ctrladdr_size);
 533                         if (r == 0) {
 534                                 socklen_t len = sep->se_ctrladdr_size;
 535                                 int saveerrno = errno;
 536
 537                                 /* update se_ctrladdr_in.sin_port */
 538                                 r = getsockname(sep->se_fd, &sep->se_ctrladdr, &len);
 539                                 if (r <= 0)
 540                                         errno = saveerrno;
 541                         }
 542                 }
 543         } else
 544 #endif
 545                 r = bind(sep->se_fd, &sep->se_ctrladdr, sep->se_ctrladdr_size);
 546         if (r < 0) {
 547                 bb_perror_msg("%s/%s (%d): bind",
 548                                 sep->se_service, sep->se_proto, sep->se_ctrladdr.sa_family);
 549                 close(sep->se_fd);
 550                 sep->se_fd = -1;
 551                 if (!timingout) {
 552                         timingout = 1;
 553                         alarm(RETRYTIME);
 554                 }
 555                 return;
 556         }
 557         if (sep->se_socktype == SOCK_STREAM)
 558                 listen(sep->se_fd, global_queuelen);
 559
 560         FD_SET(sep->se_fd, &allsock);
 561         nsock++;
 562         if (sep->se_fd > maxsock) {
 563                 maxsock = sep->se_fd;
 564                 if ((rlim_t)maxsock > rlim_ofile_cur - FD_MARGIN)
 565                         bump_nofile();
 566         }
 567 }
 568
 569 static char *nextline(void)
 570 {
 571         char *cp;
 572         FILE *fd = fconfig;
 573
 574         if (fgets(line, LINE_SIZE, fd) == NULL)
 575                 return NULL;
 576         cp = strchr(line, '\n');
 577         if (cp)
 578                 *cp = '\0';
 579         return line;
 580 }
 581
 582 static char *skip(char **cpp) /* int report; */
 583 {
 584         char *cp = *cpp;
 585         char *start;
 586
 587 /* erp: */
 588         if (*cpp == NULL) {
 589                 /* if (report) */
 590                 /* bb_error_msg("syntax error in inetd config file"); */
 591                 return NULL;
 592         }
 593
 594  again:
 595         while (*cp == ' ' || *cp == '\t')
 596                 cp++;
 597         if (*cp == '\0') {
 598                 int c;
 599
 600                 c = getc(fconfig);
 601                 ungetc(c, fconfig);
 602                 if (c == ' ' || c == '\t') {
 603                         cp = nextline();
 604                         if (cp)
 605                                 goto again;
 606                 }
 607                 *cpp = NULL;
 608                 /* goto erp; */
 609                 return NULL;
 610         }
 611         start = cp;
 612         while (*cp && *cp != ' ' && *cp != '\t')
 613                 cp++;
 614         if (*cp != '\0')
 615                 *cp++ = '\0';
 616         /* if ((*cpp = cp) == NULL) */
 617         /* goto erp; */
 618
 619         *cpp = cp;
 620         return start;
 621 }
 622
 623 static servtab_t *new_servtab(void)
 624 {
 625         return xmalloc(sizeof(servtab_t));
 626 }
 627
 628 static servtab_t *dupconfig(servtab_t *sep)
 629 {
 630         servtab_t *newtab;
 631         int argc;
 632
 633         newtab = new_servtab();
 634         memset(newtab, 0, sizeof(servtab_t));
 635         newtab->se_service = xstrdup(sep->se_service);
 636         newtab->se_socktype = sep->se_socktype;
 637         newtab->se_family = sep->se_family;
 638         newtab->se_proto = xstrdup(sep->se_proto);
 639 #if ENABLE_FEATURE_INETD_RPC
 640         newtab->se_rpcprog = sep->se_rpcprog;
 641         newtab->se_rpcversl = sep->se_rpcversl;
 642         newtab->se_rpcversh = sep->se_rpcversh;
 643 #endif
 644         newtab->se_wait = sep->se_wait;
 645         newtab->se_user = xstrdup(sep->se_user);
 646         newtab->se_group = xstrdup(sep->se_group);
 647 #ifdef INETD_FEATURE_ENABLED
 648         newtab->se_bi = sep->se_bi;
 649 #endif
 650         newtab->se_server = xstrdup(sep->se_server);
 651
 652         for (argc = 0; argc <= MAXARGV; argc++)
 653                 newtab->se_argv[argc] = xstrdup(sep->se_argv[argc]);
 654         newtab->se_max = sep->se_max;
 655
 656         return newtab;
 657 }
 658
 659 static servtab_t *getconfigent(void)
 660 {
 661         servtab_t *sep;
 662         int argc;
 663         char *cp, *arg;
 664         char *hostdelim;
 665         servtab_t *nsep;
 666         servtab_t *psep;
 667
 668         sep = new_servtab();
 669
 670         /* memset(sep, 0, sizeof *sep); */
 671  more:
 672         /* freeconfig(sep); */
 673
 674         while ((cp = nextline()) && *cp == '#') /* skip comment line */;
 675         if (cp == NULL) {
 676                 /* free(sep); */
 677                 return NULL;
 678         }
 679
 680         memset((char *) sep, 0, sizeof *sep);
 681         arg = skip(&cp);
 682         if (arg == NULL) {
 683                 /* A blank line. */
 684                 goto more;
 685         }
 686
 687         /* Check for a host name. */
 688         hostdelim = strrchr(arg, ':');
 689         if (hostdelim) {
 690                 *hostdelim = '\0';
 691                 sep->se_hostaddr = xstrdup(arg);
 692                 arg = hostdelim + 1;
 693                 /*
 694                  * If the line is of the form `host:', then just change the
 695                  * default host for the following lines.
 696                  */
 697                 if (*arg == '\0') {
 698                         arg = skip(&cp);
 699                         if (cp == NULL) {
 700                                 free(defhost);
 701                                 defhost = sep->se_hostaddr;
 702                                 goto more;
 703                         }
 704                 }
 705         } else
 706                 sep->se_hostaddr = xxstrdup(defhost);
 707
 708         sep->se_service = xxstrdup(arg);
 709         arg = skip(&cp);
 710
 711         if (strcmp(arg, "stream") == 0)
 712                 sep->se_socktype = SOCK_STREAM;
 713         else if (strcmp(arg, "dgram") == 0)
 714                 sep->se_socktype = SOCK_DGRAM;
 715         else if (strcmp(arg, "rdm") == 0)
 716                 sep->se_socktype = SOCK_RDM;
 717         else if (strcmp(arg, "seqpacket") == 0)
 718                 sep->se_socktype = SOCK_SEQPACKET;
 719         else if (strcmp(arg, "raw") == 0)
 720                 sep->se_socktype = SOCK_RAW;
 721         else
 722                 sep->se_socktype = -1;
 723
 724         sep->se_proto = xxstrdup(skip(&cp));
 725
 726         if (strcmp(sep->se_proto, "unix") == 0) {
 727                 sep->se_family = AF_UNIX;
 728         } else {
 729                 sep->se_family = AF_INET;
 730                 if (sep->se_proto[strlen(sep->se_proto) - 1] == '6')
 731 #if ENABLE_FEATURE_IPV6
 732                         sep->se_family = AF_INET6;
 733 #else
 734                         bb_error_msg("%s: IPV6 not supported", sep->se_proto);
 735 #endif
 736                 if (strncmp(sep->se_proto, "rpc/", 4) == 0) {
 737 #if ENABLE_FEATURE_INETD_RPC
 738                         char *p, *ccp;
 739                         long l;
 740
 741                         p = strchr(sep->se_service, '/');
 742                         if (p == 0) {
 743                                 bb_error_msg("%s: no rpc version", sep->se_service);
 744                                 goto more;
 745                         }
 746                         *p++ = '\0';
 747                         l = strtol(p, &ccp, 0);
 748                         if (ccp == p || l < 0 || l > INT_MAX) {
 749  badafterall:
 750                                 bb_error_msg("%s/%s: bad rpc version", sep->se_service, p);
 751                                 goto more;
 752                         }
 753                         sep->se_rpcversl = sep->se_rpcversh = l;
 754                         if (*ccp == '-') {
 755                                 p = ccp + 1;
 756                                 l = strtol(p, &ccp, 0);
 757                                 if (ccp == p || l < 0 || l > INT_MAX || l < sep->se_rpcversl || *ccp)
 758                                         goto badafterall;
 759                                 sep->se_rpcversh = l;
 760                         } else if (*ccp != '\0')
 761                                 goto badafterall;
 762 #else
 763                         bb_error_msg("%s: rpc services not supported", sep->se_service);
 764 #endif
 765                 }
 766         }
 767         arg = skip(&cp);
 768         if (arg == NULL)
 769                 goto more;
 770
 771         {
 772                 char *s = strchr(arg, '.');
 773                 if (s) {
 774                         *s++ = '\0';
 775                         sep->se_max = xatoi(s);
 776                 } else
 777                         sep->se_max = toomany;
 778         }
 779         sep->se_wait = strcmp(arg, "wait") == 0;
 780         /* if ((arg = skip(&cp, 1)) == NULL) */
 781         /* goto more; */
 782         sep->se_user = xxstrdup(skip(&cp));
 783         arg = strchr(sep->se_user, '.');
 784         if (arg == NULL)
 785                 arg = strchr(sep->se_user, ':');
 786         if (arg) {
 787                 *arg++ = '\0';
 788                 sep->se_group = xstrdup(arg);
 789         }
 790         /* if ((arg = skip(&cp, 1)) == NULL) */
 791         /* goto more; */
 792
 793         sep->se_server = xxstrdup(skip(&cp));
 794         if (strcmp(sep->se_server, "internal") == 0) {
 795 #ifdef INETD_FEATURE_ENABLED
 796                 const struct builtin *bi;
 797
 798                 for (bi = builtins; bi->bi_service; bi++)
 799                         if (bi->bi_socktype == sep->se_socktype
 800                          && strcmp(bi->bi_service, sep->se_service) == 0)
 801                                 break;
 802                 if (bi->bi_service == 0) {
 803                         bb_error_msg("internal service %s unknown", sep->se_service);
 804                         goto more;
 805                 }
 806                 sep->se_bi = bi;
 807                 sep->se_wait = 0; /* = bi->bi_wait; - always 0 */
 808 #else
 809                 bb_perror_msg("internal service %s unknown", sep->se_service);
 810                 goto more;
 811 #endif
 812         }
 813 #ifdef INETD_FEATURE_ENABLED
 814                 else
 815                 sep->se_bi = NULL;
 816 #endif
 817         argc = 0;
 818         for (arg = skip(&cp); cp; arg = skip(&cp)) {
 819                 if (argc < MAXARGV)
 820                         sep->se_argv[argc++] = xxstrdup(arg);
 821         }
 822         while (argc <= MAXARGV)
 823                 sep->se_argv[argc++] = NULL;
 824
 825         /*
 826          * Now that we've processed the entire line, check if the hostname
 827          * specifier was a comma separated list of hostnames. If so
 828          * we'll make new entries for each address.
 829          */
 830         while ((hostdelim = strrchr(sep->se_hostaddr, ',')) != NULL) {
 831                 nsep = dupconfig(sep);
 832
 833                 /*
 834                  * NULL terminate the hostname field of the existing entry,
 835                  * and make a dup for the new entry.
 836                  */
 837                 *hostdelim++ = '\0';
 838                 nsep->se_hostaddr = xstrdup(hostdelim);
 839
 840                 nsep->se_next = sep->se_next;
 841                 sep->se_next = nsep;
 842         }
 843
 844         nsep = sep;
 845         while (nsep != NULL) {
 846                 nsep->se_checked = 1;
 847                 if (nsep->se_family == AF_INET) {
 848                         if (LONE_CHAR(nsep->se_hostaddr, '*'))
 849                                 nsep->se_ctrladdr_in.sin_addr.s_addr = INADDR_ANY;
 850                         else if (!inet_aton(nsep->se_hostaddr, &nsep->se_ctrladdr_in.sin_addr)) {
 851                                 int i;
 852                                 struct hostent *hp;
 853
 854                                 hp = gethostbyname(nsep->se_hostaddr);
 855                                 if (hp == NULL) {
 856                                         bb_error_msg("%s: unknown host", nsep->se_hostaddr);
 857                                         nsep->se_checked = 0;
 858                                         goto skip;
 859                                 }
 860                                 if (hp->h_addrtype != AF_INET) {
 861                                         bb_error_msg("%s: address isn't an Internet "
 862                                                                   "address", nsep->se_hostaddr);
 863                                         nsep->se_checked = 0;
 864                                         goto skip;
 865                                 }
 866                                 i = 1;
 867                                 memmove(&nsep->se_ctrladdr_in.sin_addr,
 868                                                            hp->h_addr_list[0], sizeof(struct in_addr));
 869                                 while (hp->h_addr_list[i] != NULL) {
 870                                         psep = dupconfig(nsep);
 871                                         psep->se_hostaddr = xxstrdup(nsep->se_hostaddr);
 872                                         psep->se_checked = 1;
 873                                         memmove(&psep->se_ctrladdr_in.sin_addr,
 874                                                              hp->h_addr_list[i], sizeof(struct in_addr));
 875                                         psep->se_ctrladdr_size = sizeof(psep->se_ctrladdr_in);
 876                                         i++;
 877                                         /* Prepend to list, don't want to look up */
 878                                         /* its hostname again. */
 879                                         psep->se_next = sep;
 880                                         sep = psep;
 881                                 }
 882                         }
 883                 }
 884 /* XXX BUG?: is this skip: label supposed to remain? */
 885  skip:
 886                 nsep = nsep->se_next;
 887         }
 888
 889         /*
 890          * Finally, free any entries which failed the gethostbyname
 891          * check.
 892          */
 893         psep = NULL;
 894         nsep = sep;
 895         while (nsep != NULL) {
 896                 servtab_t *tsep;
 897
 898                 if (nsep->se_checked == 0) {
 899                         tsep = nsep;
 900                         if (psep == NULL) {
 901                                 sep = nsep->se_next;
 902                                 nsep = sep;
 903                         } else {
 904                                 nsep = nsep->se_next;
 905                                 psep->se_next = nsep;
 906                         }
 907                         freeconfig(tsep);
 908                 } else {
 909                         nsep->se_checked = 0;
 910                         psep = nsep;
 911                         nsep = nsep->se_next;
 912                 }
 913         }
 914
 915         return sep;
 916 }
 917
 918 #define Block_Using_Signals(m) do { \
 919         sigemptyset(&m); \
 920         sigaddset(&m, SIGCHLD); \
 921         sigaddset(&m, SIGHUP); \
 922         sigaddset(&m, SIGALRM); \
 923         sigprocmask(SIG_BLOCK, &m, NULL); \
 924 } while (0)
 925
 926 static servtab_t *enter(servtab_t *cp)
 927 {
 928         servtab_t *sep;
 929         sigset_t omask;
 930
 931         sep = new_servtab();
 932         *sep = *cp;
 933         sep->se_fd = -1;
 934 #if ENABLE_FEATURE_INETD_RPC
 935         sep->se_rpcprog = -1;
 936 #endif
 937         Block_Using_Signals(omask);
 938         sep->se_next = servtab;
 939         servtab = sep;
 940         sigprocmask(SIG_UNBLOCK, &omask, NULL);
 941         return sep;
 942 }
 943
 944 static int matchconf(servtab_t *old, servtab_t *new)
 945 {
 946         if (strcmp(old->se_service, new->se_service) != 0)
 947                 return 0;
 948
 949         if (strcmp(old->se_hostaddr, new->se_hostaddr) != 0)
 950                 return 0;
 951
 952         if (strcmp(old->se_proto, new->se_proto) != 0)
 953                 return 0;
 954
 955         /*
 956          * If the new servtab is bound to a specific address, check that the
 957          * old servtab is bound to the same entry. If the new service is not
 958          * bound to a specific address then the check of se_hostaddr above
 959          * is sufficient.
 960          */
 961
 962         if (old->se_family == AF_INET && new->se_family == AF_INET &&
 963                         memcmp(&old->se_ctrladdr_in.sin_addr,
 964                                         &new->se_ctrladdr_in.sin_addr,
 965                                         sizeof(new->se_ctrladdr_in.sin_addr)) != 0)
 966                 return 0;
 967
 968 #if ENABLE_FEATURE_IPV6
 969         if (old->se_family == AF_INET6 && new->se_family == AF_INET6 &&
 970                         memcmp(&old->se_ctrladdr_in6.sin6_addr,
 971                                         &new->se_ctrladdr_in6.sin6_addr,
 972                                         sizeof(new->se_ctrladdr_in6.sin6_addr)) != 0)
 973                 return 0;
 974 #endif
 975         return 1;
 976 }
 977
 978 static void config(int sig ATTRIBUTE_UNUSED)
 979 {
 980         servtab_t *sep, *cp, **sepp;
 981         sigset_t omask;
 982         size_t n;
 983         char protoname[10];
 984
 985         if (!setconfig()) {
 986                 bb_simple_perror_msg(config_filename);
 987                 return;
 988         }
 989         for (sep = servtab; sep; sep = sep->se_next)
 990                 sep->se_checked = 0;
 991         cp = getconfigent();
 992         while (cp != NULL) {
 993                 for (sep = servtab; sep; sep = sep->se_next)
 994                         if (matchconf(sep, cp))
 995                                 break;
 996
 997                 if (sep != 0) {
 998                         int i;
 999
1000 #define SWAP(type, a, b) do {type c=(type)a; a=(type)b; b=(type)c;} while (0)
1001
1002                         Block_Using_Signals(omask);
1003                         /*
1004                          * sep->se_wait may be holding the pid of a daemon
1005                          * that we're waiting for.  If so, don't overwrite
1006                          * it unless the config file explicitly says don't
1007                          * wait.
1008                          */
1009                         if (
1010 #ifdef INETD_FEATURE_ENABLED
1011                                 cp->se_bi == 0 &&
1012 #endif
1013                                 (sep->se_wait == 1 || cp->se_wait == 0))
1014                                 sep->se_wait = cp->se_wait;
1015                         SWAP(int, cp->se_max, sep->se_max);
1016                         SWAP(char *, sep->se_user, cp->se_user);
1017                         SWAP(char *, sep->se_group, cp->se_group);
1018                         SWAP(char *, sep->se_server, cp->se_server);
1019                         for (i = 0; i < MAXARGV; i++)
1020                                 SWAP(char *, sep->se_argv[i], cp->se_argv[i]);
1021 #undef SWAP
1022
1023 #if ENABLE_FEATURE_INETD_RPC
1024                         if (isrpcservice(sep))
1025                                 unregister_rpc(sep);
1026                         sep->se_rpcversl = cp->se_rpcversl;
1027                         sep->se_rpcversh = cp->se_rpcversh;
1028 #endif
1029                         sigprocmask(SIG_UNBLOCK, &omask, NULL);
1030                         freeconfig(cp);
1031                 } else {
1032                         sep = enter(cp);
1033                 }
1034                 sep->se_checked = 1;
1035
1036                 switch (sep->se_family) {
1037                 case AF_UNIX:
1038                         if (sep->se_fd != -1)
1039                                 break;
1040                         (void) unlink(sep->se_service);
1041                         n = strlen(sep->se_service);
1042                         if (n > sizeof sep->se_ctrladdr_un.sun_path - 1)
1043                                 n = sizeof sep->se_ctrladdr_un.sun_path - 1;
1044                         safe_strncpy(sep->se_ctrladdr_un.sun_path, sep->se_service, n + 1);
1045                         sep->se_ctrladdr_un.sun_family = AF_UNIX;
1046                         sep->se_ctrladdr_size = n + sizeof sep->se_ctrladdr_un.sun_family;
1047                         setup(sep);
1048                         break;
1049                 case AF_INET:
1050                         sep->se_ctrladdr_in.sin_family = AF_INET;
1051                         /* se_ctrladdr_in was set in getconfigent */
1052                         sep->se_ctrladdr_size = sizeof sep->se_ctrladdr_in;
1053
1054 #if ENABLE_FEATURE_INETD_RPC
1055                         if (isrpcservice(sep)) {
1056                                 struct rpcent *rp;
1057                                 // FIXME: atoi_or_else(str, 0) would be handy here
1058                                 sep->se_rpcprog = atoi(sep->se_service);
1059                                 if (sep->se_rpcprog == 0) {
1060                                         rp = getrpcbyname(sep->se_service);
1061                                         if (rp == 0) {
1062                                                 bb_error_msg("%s: unknown rpc service", sep->se_service);
1063                                                 goto serv_unknown;
1064                                         }
1065                                         sep->se_rpcprog = rp->r_number;
1066                                 }
1067                                 if (sep->se_fd == -1)
1068                                         setup(sep);
1069                                 if (sep->se_fd != -1)
1070                                         register_rpc(sep);
1071                         } else
1072 #endif
1073                         {
1074                                 uint16_t port = htons(atoi(sep->se_service));
1075                                 // FIXME: atoi_or_else(str, 0) would be handy here
1076                                 if (!port) {
1077                                          /*XXX*/ strncpy(protoname, sep->se_proto, sizeof(protoname));
1078                                         if (isdigit(protoname[strlen(protoname) - 1]))
1079                                                 protoname[strlen(protoname) - 1] = '\0';
1080                                         sp = getservbyname(sep->se_service, protoname);
1081                                         if (sp == 0) {
1082                                                 bb_error_msg("%s/%s: unknown service",
1083                                                                 sep->se_service, sep->se_proto);
1084                                                 goto serv_unknown;
1085                                         }
1086                                         port = sp->s_port;
1087                                 }
1088                                 if (port != sep->se_ctrladdr_in.sin_port) {
1089                                         sep->se_ctrladdr_in.sin_port = port;
1090                                         if (sep->se_fd != -1) {
1091                                                 FD_CLR(sep->se_fd, &allsock);
1092                                                 nsock--;
1093                                                 (void) close(sep->se_fd);
1094                                         }
1095                                         sep->se_fd = -1;
1096                                 }
1097                                 if (sep->se_fd == -1)
1098                                         setup(sep);
1099                         }
1100                         break;
1101 #if ENABLE_FEATURE_IPV6
1102                 case AF_INET6:
1103                         sep->se_ctrladdr_in6.sin6_family = AF_INET6;
1104                         /* se_ctrladdr_in was set in getconfigent */
1105                         sep->se_ctrladdr_size = sizeof sep->se_ctrladdr_in6;
1106
1107 #if ENABLE_FEATURE_INETD_RPC
1108                         if (isrpcservice(sep)) {
1109                                 struct rpcent *rp;
1110
1111                                 sep->se_rpcprog = atoi(sep->se_service);
1112                                 if (sep->se_rpcprog == 0) {
1113                                         rp = getrpcbyname(sep->se_service);
1114                                         if (rp == 0) {
1115                                                 bb_error_msg("%s: unknown rpc service", sep->se_service);
1116                                                 goto serv_unknown;
1117                                         }
1118                                         sep->se_rpcprog = rp->r_number;
1119                                 }
1120                                 if (sep->se_fd == -1)
1121                                         setup(sep);
1122                                 if (sep->se_fd != -1)
1123                                         register_rpc(sep);
1124                         } else
1125 #endif
1126                         {
1127                                 uint16_t port = htons(atoi(sep->se_service));
1128
1129                                 if (!port) {
1130                                          /*XXX*/ strncpy(protoname, sep->se_proto, sizeof(protoname));
1131                                         if (isdigit(protoname[strlen(protoname) - 1]))
1132                                                 protoname[strlen(protoname) - 1] = '\0';
1133                                         sp = getservbyname(sep->se_service, protoname);
1134                                         if (sp == 0) {
1135                                                 bb_error_msg("%s/%s: unknown service",
1136                                                                 sep->se_service, sep->se_proto);
1137                                                 goto serv_unknown;
1138                                         }
1139                                         port = sp->s_port;
1140                                 }
1141                                 if (port != sep->se_ctrladdr_in6.sin6_port) {
1142                                         sep->se_ctrladdr_in6.sin6_port = port;
1143                                         if (sep->se_fd != -1) {
1144                                                 FD_CLR(sep->se_fd, &allsock);
1145                                                 nsock--;
1146                                                 (void) close(sep->se_fd);
1147                                         }
1148                                         sep->se_fd = -1;
1149                                 }
1150                                 if (sep->se_fd == -1)
1151                                         setup(sep);
1152                         }
1153                         break;
1154 #endif /* FEATURE_IPV6 */
1155                 }
1156  serv_unknown:
1157                 if (cp->se_next != NULL) {
1158                         servtab_t *tmp = cp;
1159
1160                         cp = cp->se_next;
1161                         free(tmp);
1162                 } else {
1163                         free(cp);
1164                         cp = getconfigent();
1165                 }
1166         }
1167         endconfig();
1168         /*
1169          * Purge anything not looked at above.
1170          */
1171         Block_Using_Signals(omask);
1172         sepp = &servtab;
1173         while ((sep = *sepp)) {
1174                 if (sep->se_checked) {
1175                         sepp = &sep->se_next;
1176                         continue;
1177                 }
1178                 *sepp = sep->se_next;
1179                 if (sep->se_fd != -1) {
1180                         FD_CLR(sep->se_fd, &allsock);
1181                         nsock--;
1182                         (void) close(sep->se_fd);
1183                 }
1184 #if ENABLE_FEATURE_INETD_RPC
1185                 if (isrpcservice(sep))
1186                         unregister_rpc(sep);
1187 #endif
1188                 if (sep->se_family == AF_UNIX)
1189                         (void) unlink(sep->se_service);
1190                 freeconfig(sep);
1191                 free(sep);
1192         }
1193         sigprocmask(SIG_UNBLOCK, &omask, NULL);
1194 }
1195
1196
1197 static void reapchild(int sig ATTRIBUTE_UNUSED)
1198 {
1199         pid_t pid;
1200         int save_errno = errno, status;
1201         servtab_t *sep;
1202
1203         for (;;) {
1204                 pid = wait3(&status, WNOHANG, NULL);
1205                 if (pid <= 0)
1206                         break;
1207                 for (sep = servtab; sep; sep = sep->se_next)
1208                         if (sep->se_wait == pid) {
1209                                 if (WIFEXITED(status) && WEXITSTATUS(status))
1210                                         bb_error_msg("%s: exit status 0x%x",
1211                                                         sep->se_server, WEXITSTATUS(status));
1212                                 else if (WIFSIGNALED(status))
1213                                         bb_error_msg("%s: exit signal 0x%x",
1214                                                         sep->se_server, WTERMSIG(status));
1215                                 sep->se_wait = 1;
1216                                 FD_SET(sep->se_fd, &allsock);
1217                                 nsock++;
1218                         }
1219         }
1220         errno = save_errno;
1221 }
1222
1223 static void retry(int sig ATTRIBUTE_UNUSED)
1224 {
1225         servtab_t *sep;
1226
1227         timingout = 0;
1228         for (sep = servtab; sep; sep = sep->se_next) {
1229                 if (sep->se_fd == -1) {
1230                         switch (sep->se_family) {
1231                         case AF_UNIX:
1232                         case AF_INET:
1233 #if ENABLE_FEATURE_IPV6
1234                         case AF_INET6:
1235 #endif
1236                                 setup(sep);
1237 #if ENABLE_FEATURE_INETD_RPC
1238                                 if (sep->se_fd != -1 && isrpcservice(sep))
1239                                         register_rpc(sep);
1240 #endif
1241                                 break;
1242                         }
1243                 }
1244         }
1245 }
1246
1247 static void goaway(int sig ATTRIBUTE_UNUSED)
1248 {
1249         servtab_t *sep;
1250
1251         /* XXX signal race walking sep list */
1252         for (sep = servtab; sep; sep = sep->se_next) {
1253                 if (sep->se_fd == -1)
1254                         continue;
1255
1256                 switch (sep->se_family) {
1257                 case AF_UNIX:
1258                         (void) unlink(sep->se_service);
1259                         break;
1260                 case AF_INET:
1261 #if ENABLE_FEATURE_IPV6
1262                 case AF_INET6:
1263 #endif
1264 #if ENABLE_FEATURE_INETD_RPC
1265                         if (sep->se_wait == 1 && isrpcservice(sep))
1266                                 unregister_rpc(sep);   /* XXX signal race */
1267 #endif
1268                         break;
1269                 }
1270                 (void) close(sep->se_fd);
1271         }
1272         remove_pidfile(_PATH_INETDPID);
1273         exit(0);
1274 }
1275
1276
1277 #ifdef INETD_SETPROCTITLE
1278
1279 static void
1280 inetd_setproctitle(char *a, int s)
1281 {
1282         socklen_t size;
1283         char *cp;
1284         struct sockaddr_in prt_sin;
1285         char buf[80];
1286
1287         cp = Argv[0];
1288         size = sizeof(prt_sin);
1289         (void) snprintf(buf, sizeof buf, "-%s", a);
1290         if (getpeername(s, (struct sockaddr *) &prt_sin, &size) == 0) {
1291                 char *sa = inet_ntoa(prt_sin.sin_addr);
1292
1293                 buf[sizeof(buf) - 1 - strlen(sa) - 3] = '\0';
1294                 strcat(buf, " [");
1295                 strcat(buf, sa);
1296                 strcat(buf, "]");
1297         }
1298         strncpy(cp, buf, LastArg - cp);
1299         cp += strlen(cp);
1300         while (cp < LastArg)
1301                 *cp++ = ' ';
1302 }
1303 #endif
1304
1305
1306 int inetd_main(int argc, char **argv) MAIN_EXTERNALLY_VISIBLE;
1307 int inetd_main(int argc, char **argv)
1308 {
1309         servtab_t *sep;
1310         struct passwd *pwd;
1311         struct group *grp = NULL;
1312         int tmpint;
1313         struct sigaction sa, sapipe;
1314         int opt;
1315         pid_t pid;
1316         char buf[50];
1317         char *stoomany;
1318         sigset_t omask, wait_mask;
1319 #ifdef INETD_SETPROCTITLE
1320         char **envp;
1321 #endif
1322
1323         INIT_G();
1324
1325 #ifdef INETD_SETPROCTITLE
1326         envp = environ;
1327         Argv = argv;
1328         if (envp == 0 || *envp == 0)
1329                 envp = argv;
1330         while (*envp)
1331                 envp++;
1332         LastArg = envp[-1] + strlen(envp[-1]);
1333 #endif
1334
1335         uid = getuid();
1336         if (uid != 0)
1337                 config_filename = NULL;
1338
1339         opt = getopt32(argv, "R:f", &stoomany);
1340         if (opt & 1)
1341                 toomany = xatoi_u(stoomany);
1342         argv += optind;
1343         argc -= optind;
1344         if (argc)
1345                 config_filename = argv[0];
1346         if (config_filename == NULL)
1347                 bb_error_msg_and_die("non-root must specify a config file");
1348
1349         if (!(opt & 2))
1350                 bb_daemonize_or_rexec(0, argv - optind);
1351         else
1352                 bb_sanitize_stdio();
1353         openlog(applet_name, LOG_PID | LOG_NOWAIT, LOG_DAEMON);
1354         logmode = LOGMODE_SYSLOG;
1355
1356         if (uid == 0) {
1357                 /* If run by hand, ensure groups vector gets trashed */
1358                 gid_t gid = getgid();
1359                 setgroups(1, &gid);
1360         }
1361
1362         write_pidfile(_PATH_INETDPID);
1363
1364         if (getrlimit(RLIMIT_NOFILE, &rlim_ofile) < 0) {
1365                 bb_perror_msg("getrlimit");
1366         } else {
1367                 rlim_ofile_cur = rlim_ofile.rlim_cur;
1368                 if (rlim_ofile_cur == RLIM_INFINITY)    /* ! */
1369                         rlim_ofile_cur = OPEN_MAX;
1370         }
1371
1372         memset((char *) &sa, 0, sizeof(sa));
1373         sigemptyset(&sa.sa_mask);
1374         sigaddset(&sa.sa_mask, SIGALRM);
1375         sigaddset(&sa.sa_mask, SIGCHLD);
1376         sigaddset(&sa.sa_mask, SIGHUP);
1377         sa.sa_handler = retry;
1378         sigaction(SIGALRM, &sa, NULL);
1379         config(SIGHUP);
1380         sa.sa_handler = config;
1381         sigaction(SIGHUP, &sa, NULL);
1382         sa.sa_handler = reapchild;
1383         sigaction(SIGCHLD, &sa, NULL);
1384         sa.sa_handler = goaway;
1385         sigaction(SIGTERM, &sa, NULL);
1386         sa.sa_handler = goaway;
1387         sigaction(SIGINT, &sa, NULL);
1388         sa.sa_handler = SIG_IGN;
1389         sigaction(SIGPIPE, &sa, &sapipe);
1390         memset(&wait_mask, 0, sizeof(wait_mask));
1391         {
1392                 /* space for daemons to overwrite environment for ps */
1393 #define DUMMYSIZE       100
1394                 char dummy[DUMMYSIZE];
1395
1396                 (void) memset(dummy, 'x', DUMMYSIZE - 1);
1397                 dummy[DUMMYSIZE - 1] = '\0';
1398
1399                 (void) setenv("inetd_dummy", dummy, 1);
1400         }
1401
1402         for (;;) {
1403                 int n, ctrl = -1;
1404                 fd_set readable;
1405
1406                 if (nsock == 0) {
1407                         Block_Using_Signals(omask);
1408                         while (nsock == 0)
1409                                 sigsuspend(&wait_mask);
1410                         sigprocmask(SIG_UNBLOCK, &omask, NULL);
1411                 }
1412
1413                 readable = allsock;
1414                 n = select(maxsock + 1, &readable, NULL, NULL, NULL);
1415                 if (n <= 0) {
1416                         if (n < 0 && errno != EINTR) {
1417                                 bb_perror_msg("select");
1418                                 sleep(1);
1419                         }
1420                         continue;
1421                 }
1422
1423                 for (sep = servtab; n && sep; sep = sep->se_next) {
1424                         if (sep->se_fd == -1 || !FD_ISSET(sep->se_fd, &readable))
1425                                 continue;
1426
1427                         n--;
1428                         if (!sep->se_wait && sep->se_socktype == SOCK_STREAM) {
1429                                 ctrl = accept(sep->se_fd, NULL, NULL);
1430                                 if (ctrl < 0) {
1431                                         if (errno == EINTR)
1432                                                 continue;
1433                                         bb_perror_msg("accept (for %s)", sep->se_service);
1434                                         continue;
1435                                 }
1436                                 if (sep->se_family == AF_INET && sep->se_socktype == SOCK_STREAM) {
1437                                         struct sockaddr_in peer;
1438                                         socklen_t plen = sizeof(peer);
1439
1440                                         if (getpeername(ctrl, (struct sockaddr *) &peer, &plen) < 0) {
1441                                                 bb_error_msg("cannot getpeername");
1442                                                 close(ctrl);
1443                                                 continue;
1444                                         }
1445                                         if (ntohs(peer.sin_port) == 20) {
1446                                                 /* XXX ftp bounce */
1447                                                 close(ctrl);
1448                                                 continue;
1449                                         }
1450                                 }
1451                         } else
1452                                 ctrl = sep->se_fd;
1453
1454                         Block_Using_Signals(omask);
1455                         pid = 0;
1456 #ifdef INETD_FEATURE_ENABLED
1457                         if (sep->se_bi == 0 || sep->se_bi->bi_fork)
1458 #endif
1459                         {
1460                                 if (sep->se_count++ == 0)
1461                                         (void) gettimeofday(&sep->se_time, NULL);
1462                                 else if (toomany > 0 && sep->se_count >= sep->se_max) {
1463                                         struct timeval now;
1464
1465                                         (void) gettimeofday(&now, NULL);
1466                                         if (now.tv_sec - sep->se_time.tv_sec > CNT_INTVL) {
1467                                                 sep->se_time = now;
1468                                                 sep->se_count = 1;
1469                                         } else {
1470                                                 if (!sep->se_wait && sep->se_socktype == SOCK_STREAM)
1471                                                         close(ctrl);
1472                                                 if (sep->se_family == AF_INET &&
1473                                                           ntohs(sep->se_ctrladdr_in.sin_port) >= IPPORT_RESERVED) {
1474                                                         /*
1475                                                          * Cannot close it -- there are
1476                                                          * thieves on the system.
1477                                                          * Simply ignore the connection.
1478                                                          */
1479                                                         --sep->se_count;
1480                                                         continue;
1481                                                 }
1482                                                 bb_error_msg("%s/%s server failing (looping), service terminated",
1483                                                               sep->se_service, sep->se_proto);
1484                                                 if (!sep->se_wait && sep->se_socktype == SOCK_STREAM)
1485                                                         close(ctrl);
1486                                                 FD_CLR(sep->se_fd, &allsock);
1487                                                 (void) close(sep->se_fd);
1488                                                 sep->se_fd = -1;
1489                                                 sep->se_count = 0;
1490                                                 nsock--;
1491                                                 sigprocmask(SIG_UNBLOCK, &omask, NULL);
1492                                                 if (!timingout) {
1493                                                         timingout = 1;
1494                                                         alarm(RETRYTIME);
1495                                                 }
1496                                                 continue;
1497                                         }
1498                                 }
1499                                 pid = fork();
1500                         }
1501                         if (pid < 0) {
1502                                 bb_perror_msg("fork");
1503                                 if (!sep->se_wait && sep->se_socktype == SOCK_STREAM)
1504                                         close(ctrl);
1505                                 sigprocmask(SIG_UNBLOCK, &omask, NULL);
1506                                 sleep(1);
1507                                 continue;
1508                         }
1509                         if (pid && sep->se_wait) {
1510                                 sep->se_wait = pid;
1511                                 FD_CLR(sep->se_fd, &allsock);
1512                                 nsock--;
1513                         }
1514                         sigprocmask(SIG_UNBLOCK, &omask, NULL);
1515                         if (pid == 0) {
1516 #ifdef INETD_FEATURE_ENABLED
1517                                 if (sep->se_bi) {
1518                                         (*sep->se_bi->bi_fn)(ctrl, sep);
1519                                 } else
1520 #endif
1521                                 {
1522                                         pwd = getpwnam(sep->se_user);
1523                                         if (pwd == NULL) {
1524                                                 bb_error_msg("getpwnam: %s: no such user", sep->se_user);
1525                                                 goto do_exit1;
1526                                         }
1527                                         if (setsid() < 0)
1528                                                 bb_perror_msg("%s: setsid", sep->se_service);
1529                                         if (sep->se_group && (grp = getgrnam(sep->se_group)) == NULL) {
1530                                                 bb_error_msg("getgrnam: %s: no such group", sep->se_group);
1531                                                 goto do_exit1;
1532                                         }
1533                                         if (uid != 0) {
1534                                                 /* a user running private inetd */
1535                                                 if (uid != pwd->pw_uid)
1536                                                         _exit(1);
1537                                         } else if (pwd->pw_uid) {
1538                                                 if (sep->se_group)
1539                                                         pwd->pw_gid = grp->gr_gid;
1540                                                 xsetgid((gid_t) pwd->pw_gid);
1541                                                 initgroups(pwd->pw_name, pwd->pw_gid);
1542                                                 xsetuid((uid_t) pwd->pw_uid);
1543                                         } else if (sep->se_group) {
1544                                                 xsetgid(grp->gr_gid);
1545                                                 setgroups(1, &grp->gr_gid);
1546                                         }
1547                                         dup2(ctrl, 0);
1548                                         if (ctrl) close(ctrl);
1549                                         dup2(0, 1);
1550                                         dup2(0, 2);
1551                                         if (rlim_ofile.rlim_cur != rlim_ofile_cur)
1552                                                 if (setrlimit(RLIMIT_NOFILE, &rlim_ofile) < 0)
1553                                                         bb_perror_msg("setrlimit");
1554                                         closelog();
1555                                         for (tmpint = rlim_ofile_cur - 1; --tmpint > 2;)
1556                                                 (void) close(tmpint);
1557                                         sigaction(SIGPIPE, &sapipe, NULL);
1558                                         execv(sep->se_server, sep->se_argv);
1559                                         bb_perror_msg("execv %s", sep->se_server);
1560  do_exit1:
1561                                         if (sep->se_socktype != SOCK_STREAM)
1562                                                 recv(0, buf, sizeof(buf), 0);
1563                                         _exit(1);
1564                                 }
1565                         }
1566                         if (!sep->se_wait && sep->se_socktype == SOCK_STREAM)
1567                                 close(ctrl);
1568                 } /* for (sep = servtab...) */
1569         } /* for (;;) */
1570 }
1571
1572 /*
1573  * Internet services provided internally by inetd:
1574  */
1575 #define BUFSIZE 4096
1576
1577 #if ENABLE_FEATURE_INETD_SUPPORT_BUILTIN_ECHO || \
1578         ENABLE_FEATURE_INETD_SUPPORT_BUILTIN_CHARGEN || \
1579         ENABLE_FEATURE_INETD_SUPPORT_BUILTIN_DAYTIME
1580 static int dg_badinput(struct sockaddr_in *dg_sin)
1581 {
1582         if (ntohs(dg_sin->sin_port) < IPPORT_RESERVED)
1583                 return 1;
1584         if (dg_sin->sin_addr.s_addr == htonl(INADDR_BROADCAST))
1585                 return 1;
1586         /* XXX compare against broadcast addresses in SIOCGIFCONF list? */
1587         return 0;
1588 }
1589 #endif
1590
1591 #if ENABLE_FEATURE_INETD_SUPPORT_BUILTIN_ECHO
1592 /* Echo service -- echo data back */
1593 /* ARGSUSED */
1594 static void
1595 echo_stream(int s, servtab_t *sep)
1596 {
1597         char buffer[BUFSIZE];
1598         int i;
1599
1600         inetd_setproctitle(sep->se_service, s);
1601         while (1) {
1602                 i = read(s, buffer, sizeof(buffer));
1603                 if (i <= 0) break;
1604                 /* FIXME: this isnt correct - safe_write()? */
1605                 if (write(s, buffer, i) <= 0) break;
1606         }
1607         exit(0);
1608 }
1609
1610 /* Echo service -- echo data back */
1611 /* ARGSUSED */
1612 static void
1613 echo_dg(int s, servtab_t *sep ATTRIBUTE_UNUSED)
1614 {
1615         char buffer[BUFSIZE];
1616         int i;
1617         socklen_t size;
1618         /* struct sockaddr_storage ss; */
1619         struct sockaddr sa;
1620
1621         size = sizeof(sa);
1622         i = recvfrom(s, buffer, sizeof(buffer), 0, &sa, &size);
1623         if (i < 0)
1624                 return;
1625         if (dg_badinput((struct sockaddr_in *) &sa))
1626                 return;
1627         (void) sendto(s, buffer, i, 0, &sa, sizeof(sa));
1628 }
1629 #endif  /* FEATURE_INETD_SUPPORT_BUILTIN_ECHO */
1630
1631 #if ENABLE_FEATURE_INETD_SUPPORT_BUILTIN_DISCARD
1632 /* Discard service -- ignore data */
1633 /* ARGSUSED */
1634 static void
1635 discard_stream(int s, servtab_t *sep)
1636 {
1637         char buffer[BUFSIZE];
1638
1639         inetd_setproctitle(sep->se_service, s);
1640         while (1) {
1641                 if (safe_read(s, buffer, sizeof(buffer)) <= 0)
1642                         exit(0);
1643         }
1644 }
1645
1646 /* Discard service -- ignore data */
1647 /* ARGSUSED */
1648 static void
1649 discard_dg(int s, servtab_t *sep ATTRIBUTE_UNUSED)
1650 {
1651         char buffer[BUFSIZE];
1652
1653         (void) read(s, buffer, sizeof(buffer));
1654 }
1655 #endif /* FEATURE_INETD_SUPPORT_BUILTIN_DISCARD */
1656
1657
1658 #if ENABLE_FEATURE_INETD_SUPPORT_BUILTIN_CHARGEN
1659 #define LINESIZ 72
1660
1661 static void
1662 initring(void)
1663 {
1664         int i;
1665
1666         endring = ring;
1667         for (i = 0; i <= 128; ++i)
1668                 if (isprint(i))
1669                         *endring++ = i;
1670 }
1671
1672 /* Character generator */
1673 /* ARGSUSED */
1674 static void
1675 chargen_stream(int s, servtab_t *sep)
1676 {
1677         char *rs;
1678         int len;
1679         char text[LINESIZ + 2];
1680
1681         inetd_setproctitle(sep->se_service, s);
1682
1683         if (!endring) {
1684                 initring();
1685                 rs = ring;
1686         }
1687
1688         text[LINESIZ] = '\r';
1689         text[LINESIZ + 1] = '\n';
1690         rs = ring;
1691         for (;;) {
1692                 len = endring - rs;
1693                 if (len >= LINESIZ)
1694                         memmove(text, rs, LINESIZ);
1695                 else {
1696                         memmove(text, rs, len);
1697                         memmove(text + len, ring, LINESIZ - len);
1698                 }
1699                 if (++rs == endring)
1700                         rs = ring;
1701                 if (write(s, text, sizeof(text)) != sizeof(text))
1702                         break;
1703         }
1704         exit(0);
1705 }
1706
1707 /* Character generator */
1708 /* ARGSUSED */
1709 static void
1710 chargen_dg(int s, servtab_t *sep ATTRIBUTE_UNUSED)
1711 {
1712         /* struct sockaddr_storage ss; */
1713         struct sockaddr sa;
1714         int len;
1715         char text[LINESIZ + 2];
1716         socklen_t size;
1717
1718         if (!endring) {
1719                 initring();
1720                 ringpos = ring;
1721         }
1722
1723         size = sizeof(sa);
1724         if (recvfrom(s, text, sizeof(text), 0, &sa, &size) < 0)
1725                 return;
1726         if (dg_badinput((struct sockaddr_in *) &sa))
1727                 return;
1728
1729         len = endring - ringpos;
1730         if (len >= LINESIZ)
1731                 memmove(text, ringpos, LINESIZ);
1732         else {
1733                 memmove(text, ringpos, len);
1734                 memmove(text + len, ring, LINESIZ - len);
1735         }
1736         if (++ringpos == endring)
1737                 ringpos = ring;
1738         text[LINESIZ] = '\r';
1739         text[LINESIZ + 1] = '\n';
1740         (void) sendto(s, text, sizeof(text), 0, &sa, sizeof(sa));
1741 }
1742 #endif /* FEATURE_INETD_SUPPORT_BUILTIN_CHARGEN */
1743
1744
1745 #if ENABLE_FEATURE_INETD_SUPPORT_BUILTIN_TIME
1746 /*
1747  * Return a machine readable date and time, in the form of the
1748  * number of seconds since midnight, Jan 1, 1900.  Since gettimeofday
1749  * returns the number of seconds since midnight, Jan 1, 1970,
1750  * we must add 2208988800 seconds to this figure to make up for
1751  * some seventy years Bell Labs was asleep.
1752  */
1753
1754 static unsigned machtime(void)
1755 {
1756         struct timeval tv;
1757
1758         if (gettimeofday(&tv, NULL) < 0) {
1759                 fprintf(stderr, "Unable to get time of day\n");
1760                 return 0L;
1761         }
1762         return htonl((unsigned) tv.tv_sec + 2208988800UL);
1763 }
1764
1765 /* ARGSUSED */
1766 static void
1767 machtime_stream(int s, servtab_t *sep ATTRIBUTE_UNUSED)
1768 {
1769         unsigned result;
1770
1771         result = machtime();
1772         (void) write(s, (char *) &result, sizeof(result));
1773 }
1774
1775 /* ARGSUSED */
1776 static void
1777 machtime_dg(int s, servtab_t *sep ATTRIBUTE_UNUSED)
1778 {
1779         unsigned result;
1780         /* struct sockaddr_storage ss; */
1781         struct sockaddr sa;
1782         struct sockaddr_in *dg_sin;
1783         socklen_t size;
1784
1785         size = sizeof(sa);
1786         if (recvfrom(s, (char *) &result, sizeof(result), 0, &sa, &size) < 0)
1787                 return;
1788         /* if (dg_badinput((struct sockaddr *)&ss)) */
1789         dg_sin = (struct sockaddr_in *) &sa;
1790         if (dg_sin->sin_addr.s_addr == htonl(INADDR_BROADCAST) ||
1791                         ntohs(dg_sin->sin_port) < IPPORT_RESERVED / 2)
1792                 return;
1793         result = machtime();
1794         (void) sendto(s, (char *) &result, sizeof(result), 0, &sa, sizeof(sa));
1795 }
1796 #endif /* FEATURE_INETD_SUPPORT_BUILTIN_TIME */
1797
1798
1799 #if ENABLE_FEATURE_INETD_SUPPORT_BUILTIN_DAYTIME
1800 /* Return human-readable time of day */
1801 /* ARGSUSED */
1802 static void daytime_stream(int s, servtab_t *sep ATTRIBUTE_UNUSED)
1803 {
1804         char buffer[32];
1805         time_t t;
1806
1807         t = time(NULL);
1808
1809 // fdprintf instead?
1810         (void) sprintf(buffer, "%.24s\r\n", ctime(&t));
1811         (void) write(s, buffer, strlen(buffer));
1812 }
1813
1814 /* Return human-readable time of day */
1815 /* ARGSUSED */
1816 void
1817 daytime_dg(int s, servtab_t *sep ATTRIBUTE_UNUSED)
1818 {
1819         char buffer[256];
1820         time_t t;
1821         /* struct sockaddr_storage ss; */
1822         struct sockaddr sa;
1823         socklen_t size;
1824
1825         t = time(NULL);
1826
1827         size = sizeof(sa);
1828         if (recvfrom(s, buffer, sizeof(buffer), 0, &sa, &size) < 0)
1829                 return;
1830         if (dg_badinput((struct sockaddr_in *) &sa))
1831                 return;
1832         (void) sprintf(buffer, "%.24s\r\n", ctime(&t));
1833         (void) sendto(s, buffer, strlen(buffer), 0, &sa, sizeof(sa));
1834 }
1835 #endif /* FEATURE_INETD_SUPPORT_BUILTIN_DAYTIME */