/* $NetBSD: inetd.c,v 1.38.2.2 1998/05/05 08:12:06 mycroft Exp $ */ /* * Copyright (c) 1983, 1991, 1993, 1994 * The Regents of the University of California. All rights reserved. * * Redistribution and use in source and binary forms, with or without * modification, are permitted provided that the following conditions * are met: * 1. Redistributions of source code must retain the above copyright * notice, this list of conditions and the following disclaimer. * 2. Redistributions in binary form must reproduce the above copyright * notice, this list of conditions and the following disclaimer in the * documentation and/or other materials provided with the distribution. * 3. All advertising materials mentioning features or use of this software * must display the following acknowledgement: * This product includes software developed by the University of * California, Berkeley and its contributors. * 4. Neither the name of the University nor the names of its contributors * may be used to endorse or promote products derived from this software * without specific prior written permission. * * THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE * ARE DISCLAIMED. IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF * SUCH DAMAGE. */ #ifdef __NetBSD__ #include #else #define __COPYRIGHT(x) char *copyright = x #define __RCSID(x) char *rcsid = x char *__progname; #endif #ifndef lint __COPYRIGHT("@(#) Copyright (c) 1983, 1991, 1993, 1994\n\ The Regents of the University of California. All rights reserved.\n"); #if 0 static char sccsid[] = "@(#)inetd.c 8.4 (Berkeley) 4/13/94"; #else __RCSID("$NetBSD: inetd.c,v 1.38.2.2 1998/05/05 08:12:06 mycroft Exp $"); #endif #endif /* not lint */ /* * Inetd - Internet super-server * * This program invokes all internet services as needed. Connection-oriented * services are invoked each time a connection is made, by creating a process. * This process is passed the connection as file descriptor 0 and is expected * to do a getpeername to find out the source host and port. * * Datagram oriented services are invoked when a datagram * arrives; a process is created and passed a pending message * on file descriptor 0. Datagram servers may either connect * to their peer, freeing up the original socket for inetd * to receive further messages on, or ``take over the socket'', * processing all arriving datagrams and, eventually, timing * out. The first type of server is said to be ``multi-threaded''; * the second type of server ``single-threaded''. * * Inetd uses a configuration file which is read at startup * and, possibly, at some later time in response to a hangup signal. * The configuration file is ``free format'' with fields given in the * order shown below. Continuation lines for an entry must being with * a space or tab. All fields must be present in each entry. * * service name must be in /etc/services or must * name a tcpmux service * socket type stream/dgram/raw/rdm/seqpacket * protocol must be in /etc/protocols * wait/nowait[.max] single-threaded/multi-threaded, max # * user[.group] user/group to run daemon as * server program full path name * server program arguments maximum of MAXARGS (20) * * For RPC services * service name/version must be in /etc/rpc * socket type stream/dgram/raw/rdm/seqpacket * protocol must be in /etc/protocols * wait/nowait[.max] single-threaded/multi-threaded * user[.group] user to run daemon as * server program full path name * server program arguments maximum of MAXARGS (20) * * For non-RPC services, the "service name" can be of the form * hostaddress:servicename, in which case the hostaddress is used * as the host portion of the address to listen on. If hostaddress * consists of a single `*' character, INADDR_ANY is used. * * A line can also consist of just * hostaddress: * where hostaddress is as in the preceding paragraph. Such a line must * have no further fields; the specified hostaddress is remembered and * used for all further lines that have no hostaddress specified, * until the next such line (or EOF). (This is why * is provided to * allow explicit specification of INADDR_ANY.) A line * *: * is implicitly in effect at the beginning of the file. * * The hostaddress specifier may (and often will) contain dots; * the service name must not. * * For RPC services, host-address specifiers are accepted and will * work to some extent; however, because of limitations in the * portmapper interface, it will not work to try to give more than * one line for any given RPC service, even if the host-address * specifiers are different. * * TCP services without official port numbers are handled with the * RFC1078-based tcpmux internal service. Tcpmux listens on port 1 for * requests. When a connection is made from a foreign host, the service * requested is passed to tcpmux, which looks it up in the servtab list * and returns the proper entry for the service. Tcpmux returns a * negative reply if the service doesn't exist, otherwise the invoked * server is expected to return the positive reply if the service type in * inetd.conf file has the prefix "tcpmux/". If the service type has the * prefix "tcpmux/+", tcpmux will return the positive reply for the * process; this is for compatibility with older server code, and also * allows you to invoke programs that use stdin/stdout without putting any * special server code in them. Services that use tcpmux are "nowait" * because they do not have a well-known port and hence cannot listen * for new requests. * * Comment lines are indicated by a `#' in column 1. */ /* * Here's the scoop concerning the user.group feature: * * 1) set-group-option off. * * a) user = root: NO setuid() or setgid() is done * * b) other: setuid() * setgid(primary group as found in passwd) * initgroups(name, primary group) * * 2) set-group-option on. * * a) user = root: NO setuid() * setgid(specified group) * NO initgroups() * * b) other: setuid() * setgid(specified group) * initgroups(name, specified group) * */ #include #include #include #include #include #include #include #include #include #ifndef RLIMIT_NOFILE #define RLIMIT_NOFILE RLIMIT_OFILE #endif #define RPC #include #include #ifdef RPC #include #include #ifdef HAVE_RPC_RPCENT_H #include #endif #endif #include #include #include #include #include #include #include #include #include #include #include #include "pathnames.h" #ifdef LIBWRAP # include #ifndef LIBWRAP_ALLOW_FACILITY # define LIBWRAP_ALLOW_FACILITY LOG_AUTH #endif #ifndef LIBWRAP_ALLOW_SEVERITY # define LIBWRAP_ALLOW_SEVERITY LOG_INFO #endif #ifndef LIBWRAP_DENY_FACILITY # define LIBWRAP_DENY_FACILITY LOG_AUTH #endif #ifndef LIBWRAP_DENY_SEVERITY # define LIBWRAP_DENY_SEVERITY LOG_WARNING #endif int allow_severity = LIBWRAP_ALLOW_FACILITY|LIBWRAP_ALLOW_SEVERITY; int deny_severity = LIBWRAP_DENY_FACILITY|LIBWRAP_DENY_SEVERITY; #endif #define TOOMANY 40 /* don't start more than TOOMANY */ #define CNT_INTVL 60 /* servers in CNT_INTVL sec. */ #define RETRYTIME (60*10) /* retry after bind or server fail */ sigset_t sig_block; int debug; #ifdef LIBWRAP int lflag; #endif int access_on; int nsock, maxsock; fd_set allsock; int options; int timingout; struct servent *sp; char *curdom; #ifndef OPEN_MAX #define OPEN_MAX 64 #endif /* Reserve some descriptors, 3 stdio + at least: 1 log, 1 conf. file */ #define FD_MARGIN (8) rlim_t rlim_ofile_cur = OPEN_MAX; #ifdef RLIMIT_NOFILE struct rlimit rlim_ofile; #endif struct servtab { char *se_hostaddr; /* host address to listen on */ char *se_service; /* name of service */ int se_socktype; /* type of socket to use */ int se_family; /* address family */ char *se_proto; /* protocol used */ int se_rpcprog; /* rpc program number */ int se_rpcversl; /* rpc program lowest version */ int se_rpcversh; /* rpc program highest version */ #define isrpcservice(sep) ((sep)->se_rpcversl != 0) pid_t se_wait; /* single threaded server */ short se_switched; /* switched by access_on/off */ short se_checked; /* looked at during merge */ char *se_user; /* user name to run as */ char *se_group; /* group name to run as */ struct biltin *se_bi; /* if built-in, description */ char *se_server; /* server program */ #define MAXARGV 20 char *se_argv[MAXARGV+1]; /* program arguments */ int se_fd; /* open descriptor */ int se_type; /* type */ union { struct sockaddr se_un_ctrladdr; struct sockaddr_in se_un_ctrladdr_in; struct sockaddr_un se_un_ctrladdr_un; } se_un; /* bound address */ #define se_ctrladdr se_un.se_un_ctrladdr #define se_ctrladdr_in se_un.se_un_ctrladdr_in #define se_ctrladdr_un se_un.se_un_ctrladdr_un int se_ctrladdr_size; int se_max; /* max # of instances of this service */ int se_count; /* number started since se_time */ struct timeval se_time; /* start of se_count */ #ifdef MULOG int se_log; #define MULOG_RFC931 0x40000000 #endif struct servtab *se_next; } *servtab; #define NORM_TYPE 0 #define MUX_TYPE 1 #define MUXPLUS_TYPE 2 #define ISMUX(sep) (((sep)->se_type == MUX_TYPE) || \ ((sep)->se_type == MUXPLUS_TYPE)) #define ISMUXPLUS(sep) ((sep)->se_type == MUXPLUS_TYPE) #ifndef __P #define __P(x) x #endif void chargen_dg __P((int, struct servtab *)); void chargen_stream __P((int, struct servtab *)); void close_sep __P((struct servtab *)); void config __P((int)); void access_switch __P((int)); void daytime_dg __P((int, struct servtab *)); void daytime_stream __P((int, struct servtab *)); void discard_dg __P((int, struct servtab *)); void discard_stream __P((int, struct servtab *)); void echo_dg __P((int, struct servtab *)); void echo_stream __P((int, struct servtab *)); void endconfig __P((void)); struct servtab *enter __P((struct servtab *)); void freeconfig __P((struct servtab *)); struct servtab *getconfigent __P((void)); void goaway __P((int)); void machtime_dg __P((int, struct servtab *)); void machtime_stream __P((int, struct servtab *)); char *newstr __P((char *)); char *nextline __P((FILE *)); void print_service __P((char *, struct servtab *)); void reapchild __P((int)); void retry __P((int)); void run_service __P((int, struct servtab *)); int setconfig __P((void)); void setup __P((struct servtab *)); char *sskip __P((char **)); char *skip __P((char **)); void tcpmux __P((int, struct servtab *)); void usage __P((void)); void logpid __P((void)); void register_rpc __P((struct servtab *sep)); void unregister_rpc __P((struct servtab *sep)); void bump_nofile __P((void)); void inetd_setproctitle __P((char *, int)); void initring __P((void)); long machtime __P((void)); static int getline __P((int, char *, int)); int main __P((int, char *[], char *[])); struct biltin { char *bi_service; /* internally provided service name */ int bi_socktype; /* type of socket supported */ short bi_fork; /* 1 if should fork before call */ short bi_wait; /* 1 if should wait for child */ void (*bi_fn) __P((int, struct servtab *)); /* function which performs it */ } biltins[] = { /* Echo received data */ { "echo", SOCK_STREAM, 1, 0, echo_stream }, { "echo", SOCK_DGRAM, 0, 0, echo_dg }, /* Internet /dev/null */ { "discard", SOCK_STREAM, 1, 0, discard_stream }, { "discard", SOCK_DGRAM, 0, 0, discard_dg }, /* Return 32 bit time since 1970 */ { "time", SOCK_STREAM, 0, 0, machtime_stream }, { "time", SOCK_DGRAM, 0, 0, machtime_dg }, /* Return human-readable time */ { "daytime", SOCK_STREAM, 0, 0, daytime_stream }, { "daytime", SOCK_DGRAM, 0, 0, daytime_dg }, /* Familiar character generator */ { "chargen", SOCK_STREAM, 1, 0, chargen_stream }, { "chargen", SOCK_DGRAM, 0, 0, chargen_dg }, { "tcpmux", SOCK_STREAM, 1, 0, tcpmux }, { NULL } }; #define NUMINT (sizeof(intab) / sizeof(struct inent)) char *CONFIG = _PATH_INETDCONF; char **Argv; char *LastArg; extern char *__progname; #ifdef sun /* * Sun's RPC library caches the result of `dtablesize()' * This is incompatible with our "bumping" of file descriptors "on demand" */ int _rpc_dtablesize() { return rlim_ofile_cur; } #endif int main(argc, argv, envp) int argc; char *argv[], *envp[]; { struct servtab *sep, *nsep; struct sigaction sa; int ch, dofork; pid_t pid; __progname = argv[0]; if (strchr(__progname, '/')) __progname = strrchr(__progname, '/') + 1; Argv = argv; if (envp == 0 || *envp == 0) envp = argv; while (*envp) envp++; LastArg = envp[-1] + strlen(envp[-1]); while ((ch = getopt(argc, argv, #ifdef LIBWRAP "dln" #else "dn" #endif )) != -1) switch(ch) { case 'd': debug = 1; options |= SO_DEBUG; break; #ifdef LIBWRAP case 'l': lflag = 1; break; #endif case 'n': access_on = 1; break; case '?': default: usage(); } argc -= optind; argv += optind; if (argc > 0) CONFIG = argv[0]; if (debug == 0) { int fd; switch (fork ()) { case -1: return (-1); case 0: break; default: _exit(0); } if (setsid() == -1) { fprintf(stderr, "%s: couldn't setsid\n", __progname); exit(1); } chdir("/"); if ((fd = open("/dev/null", O_RDWR, 0)) != -1) { dup2(fd, STDIN_FILENO); dup2(fd, STDOUT_FILENO); dup2(fd, STDERR_FILENO); if (fd > STDERR_FILENO) close(fd); } } openlog(__progname, LOG_PID | LOG_NOWAIT, LOG_DAEMON); logpid(); #ifdef RLIMIT_NOFILE if (getrlimit(RLIMIT_NOFILE, &rlim_ofile) < 0) { syslog(LOG_ERR, "getrlimit: %m"); } else { rlim_ofile_cur = rlim_ofile.rlim_cur; if (rlim_ofile_cur == RLIM_INFINITY) /* ! */ rlim_ofile_cur = OPEN_MAX; } #endif memset(&sa, 0, sizeof(sa)); sigemptyset(&sig_block); sigaddset(&sig_block, SIGCHLD); sigaddset(&sig_block, SIGHUP); sigaddset(&sig_block, SIGALRM); sigaddset(&sig_block, SIGUSR1); sigaddset(&sig_block, SIGUSR2); memcpy(&sa.sa_mask, &sig_block, sizeof(sigset_t)); sa.sa_handler = retry; sigaction(SIGALRM, &sa, NULL); config(SIGHUP); sa.sa_handler = config; sigaction(SIGHUP, &sa, NULL); sa.sa_handler = access_switch; sigaction(SIGUSR1, &sa, NULL); sigaction(SIGUSR2, &sa, NULL); sa.sa_handler = reapchild; sigaction(SIGCHLD, &sa, NULL); sa.sa_handler = goaway; sigaction(SIGTERM, &sa, NULL); sa.sa_handler = goaway; sigaction(SIGINT, &sa, NULL); sigemptyset(&sa.sa_mask); sa.sa_handler = SIG_IGN; sigaction(SIGPIPE, &sa, NULL); { /* space for daemons to overwrite environment for ps */ #define DUMMYSIZE 100 char dummy[DUMMYSIZE]; (void)memset(dummy, 'x', DUMMYSIZE - 1); dummy[DUMMYSIZE - 1] = '\0'; (void)setenv("inetd_dummy", dummy, 1); } for (;;) { int n, ctrl; fd_set readable; if (nsock == 0) { sigset_t prev_mask; sigprocmask(SIG_SETMASK, &sig_block, &prev_mask); while (nsock == 0) sigsuspend(&prev_mask); sigprocmask(SIG_SETMASK, &prev_mask, NULL); } readable = allsock; if ((n = select(maxsock + 1, &readable, (fd_set *)0, (fd_set *)0, (struct timeval *)0)) <= 0) { if (n == -1 && errno != EINTR) { syslog(LOG_WARNING, "select: %m"); sleep(1); } continue; } for (sep = servtab; n && sep; sep = nsep) { nsep = sep->se_next; if (sep->se_fd != -1 && FD_ISSET(sep->se_fd, &readable)) { n--; if (debug) fprintf(stderr, "someone wants %s\n", sep->se_service); if (!sep->se_wait && sep->se_socktype == SOCK_STREAM) { /* XXX here do the libwrap check-before-accept */ ctrl = accept(sep->se_fd, (struct sockaddr *)0, (int *)0); if (debug) fprintf(stderr, "accept, ctrl %d\n", ctrl); if (ctrl < 0) { if (errno != EINTR) syslog(LOG_WARNING, "accept (for %s): %m", sep->se_service); continue; } } else ctrl = sep->se_fd; sigprocmask(SIG_SETMASK, &sig_block, NULL); pid = 0; #ifdef LIBWRAP_INTERNAL dofork = 1; #else dofork = (sep->se_bi == 0 || sep->se_bi->bi_fork); #endif if (dofork) { if (sep->se_count++ == 0) (void)gettimeofday(&sep->se_time, (struct timezone *)0); else if (sep->se_count >= sep->se_max) { struct timeval now; (void)gettimeofday(&now, (struct timezone *)0); if (now.tv_sec - sep->se_time.tv_sec > CNT_INTVL) { sep->se_time = now; sep->se_count = 1; } else { syslog(LOG_ERR, "%s/%s server failing (looping), service terminated\n", sep->se_service, sep->se_proto); close_sep(sep); sigprocmask(SIG_UNBLOCK, &sig_block, NULL); if (!timingout) { timingout = 1; alarm(RETRYTIME); } continue; } } pid = fork(); if (pid < 0) { syslog(LOG_ERR, "fork: %m"); if (!sep->se_wait && sep->se_socktype == SOCK_STREAM) close(ctrl); sigprocmask(SIG_UNBLOCK, &sig_block, NULL); sleep(1); continue; } if (pid != 0 && sep->se_wait) { sep->se_wait = pid; FD_CLR(sep->se_fd, &allsock); nsock--; } if (pid == 0) { sigemptyset(&sa.sa_mask); sa.sa_handler = SIG_DFL; sigaction(SIGPIPE, &sa, NULL); if (debug) setsid(); } } sigprocmask(SIG_UNBLOCK, &sig_block, NULL); if (pid == 0) { run_service(ctrl, sep); if (dofork) exit(0); } if (!sep->se_wait && sep->se_socktype == SOCK_STREAM) close(ctrl); } } } } void run_service(ctrl, sep) int ctrl; struct servtab *sep; { struct passwd *pwd; struct group *grp = NULL; /* XXX gcc */ #ifdef LIBWRAP struct request_info req; int denied; char buf[7], *service = NULL; /* XXX gcc */ #endif #ifdef LIBWRAP #ifndef LIBWRAP_INTERNAL if (sep->se_bi == 0) #endif if (!sep->se_wait && sep->se_socktype == SOCK_STREAM) { request_init(&req, RQ_DAEMON, sep->se_argv[0] ? sep->se_argv[0] : sep->se_service, RQ_FILE, ctrl, NULL); fromhost(&req); denied = !hosts_access(&req); if (denied || lflag) { sp = getservbyport(sep->se_ctrladdr_in.sin_port, sep->se_proto); if (sp == NULL) { (void)sprintf(buf, "%d", ntohs(sep->se_ctrladdr_in.sin_port)); service = buf; } else service = sp->s_name; } if (denied) { syslog(deny_severity, "refused connection from %.500s, service %s (%s)", eval_client(&req), service, sep->se_proto); goto reject; } if (lflag) { syslog(allow_severity, "connection from %.500s, service %s (%s)", eval_client(&req), service, sep->se_proto); } } #endif /* LIBWRAP */ if (sep->se_bi) { (*sep->se_bi->bi_fn)(ctrl, sep); } else { if ((pwd = getpwnam(sep->se_user)) == NULL) { syslog(LOG_ERR, "%s/%s: %s: No such user", sep->se_service, sep->se_proto, sep->se_user); goto reject; } if (sep->se_group && (grp = getgrnam(sep->se_group)) == NULL) { syslog(LOG_ERR, "%s/%s: %s: No such group", sep->se_service, sep->se_proto, sep->se_group); goto reject; } if (pwd->pw_uid) { if (sep->se_group) pwd->pw_gid = grp->gr_gid; if (setgid(pwd->pw_gid) < 0) { syslog(LOG_ERR, "%s/%s: can't set gid %d: %m", sep->se_service, sep->se_proto, pwd->pw_gid); goto reject; } (void) initgroups(pwd->pw_name, pwd->pw_gid); if (setuid(pwd->pw_uid) < 0) { syslog(LOG_ERR, "%s/%s: can't set uid %d: %m", sep->se_service, sep->se_proto, pwd->pw_uid); goto reject; } } else if (sep->se_group) { (void) setgid((gid_t)grp->gr_gid); } if (debug) fprintf(stderr, "%d execl %s\n", getpid(), sep->se_server); #ifdef MULOG if (sep->se_log) dolog(sep, ctrl); #endif /* Set our control descriptor to not close-on-exec... */ if (fcntl(ctrl, F_SETFD, 0) < 0) syslog(LOG_ERR, "fcntl (F_SETFD, 0): %m"); /* ...and dup it to stdin, stdout, and stderr. */ if (ctrl != 0) { dup2(ctrl, 0); close(ctrl); ctrl = 0; } dup2(0, 1); dup2(0, 2); #ifdef RLIMIT_NOFILE if (rlim_ofile.rlim_cur != rlim_ofile_cur && setrlimit(RLIMIT_NOFILE, &rlim_ofile) < 0) syslog(LOG_ERR, "setrlimit: %m"); #endif execv(sep->se_server, sep->se_argv); syslog(LOG_ERR, "cannot execute %s: %m", sep->se_server); reject: if (sep->se_socktype != SOCK_STREAM) recv(ctrl, buf, sizeof (buf), 0); _exit(1); } } void reapchild(signo) int signo; { int status; pid_t pid; struct servtab *sep; for (;;) { pid = wait3(&status, WNOHANG, (struct rusage *)0); if (pid <= 0) break; if (debug) fprintf(stderr, "%d reaped, status %#x\n", pid, status); for (sep = servtab; sep; sep = sep->se_next) if (sep->se_wait == pid) { if (WIFEXITED(status) && WEXITSTATUS(status)) syslog(LOG_WARNING, "%s: exit status 0x%x", sep->se_server, WEXITSTATUS(status)); else if (WIFSIGNALED(status)) syslog(LOG_WARNING, "%s: exit signal 0x%x", sep->se_server, WTERMSIG(status)); sep->se_wait = 1; FD_SET(sep->se_fd, &allsock); nsock++; if (debug) fprintf(stderr, "restored %s, fd %d\n", sep->se_service, sep->se_fd); } } } void config(signo) int signo; { struct servtab *sep, *cp, **sepp; sigset_t omask; int n; if (!setconfig()) { syslog(LOG_ERR, "%s: %m", CONFIG); return; } for (sep = servtab; sep; sep = sep->se_next) sep->se_checked = 0; while ((cp = getconfigent())) { for (sep = servtab; sep; sep = sep->se_next) if (strcmp(sep->se_service, cp->se_service) == 0 && strcmp(sep->se_hostaddr, cp->se_hostaddr) == 0 && strcmp(sep->se_proto, cp->se_proto) == 0 && ISMUX(sep) == ISMUX(cp)) break; if (sep != 0) { int i; #define SWAP(type, a, b) {type c=a; a=b; b=c;} sigprocmask(SIG_BLOCK, &sig_block, &omask); /* * sep->se_wait may be holding the pid of a daemon * that we're waiting for. If so, don't overwrite * it unless the config file explicitly says don't * wait. */ if (cp->se_bi == 0 && (sep->se_wait == 1 || cp->se_wait == 0)) sep->se_wait = cp->se_wait; SWAP(char *, sep->se_user, cp->se_user); SWAP(char *, sep->se_group, cp->se_group); SWAP(char *, sep->se_server, cp->se_server); for (i = 0; i < MAXARGV; i++) SWAP(char *, sep->se_argv[i], cp->se_argv[i]); SWAP(int, cp->se_type, sep->se_type); SWAP(int, cp->se_max, sep->se_max); #undef SWAP if (isrpcservice(sep)) unregister_rpc(sep); sep->se_rpcversl = cp->se_rpcversl; sep->se_rpcversh = cp->se_rpcversh; sigprocmask(SIG_SETMASK, &omask, NULL); freeconfig(cp); if (debug) print_service("REDO", sep); } else { sep = enter(cp); if (debug) print_service("ADD ", sep); } sep->se_checked = 1; switch (sep->se_family) { case AF_UNIX: if (sep->se_fd != -1) break; n = strlen(sep->se_service); if (n > sizeof(sep->se_ctrladdr_un.sun_path)) { syslog(LOG_ERR, "%s: address too long", sep->se_service); sep->se_checked = 0; continue; } (void)unlink(sep->se_service); strncpy(sep->se_ctrladdr_un.sun_path, sep->se_service, n); sep->se_ctrladdr_un.sun_family = AF_UNIX; sep->se_ctrladdr_size = n + sizeof(sep->se_ctrladdr_un) - sizeof(sep->se_ctrladdr_un.sun_path); if (!ISMUX(sep) && (!sep->se_switched || access_on)) setup(sep); break; case AF_INET: sep->se_ctrladdr_in.sin_family = AF_INET; if (!strcmp(sep->se_hostaddr,"*")) sep->se_ctrladdr_in.sin_addr.s_addr = INADDR_ANY; else if ((sep->se_ctrladdr_in.sin_addr.s_addr = inet_addr(sep->se_hostaddr)) == -1) { /* Do we really want to support hostname lookups here? */ struct hostent *hp; hp = gethostbyname(sep->se_hostaddr); if (hp == 0) { syslog(LOG_ERR, "%s: unknown host", sep->se_hostaddr); sep->se_checked = 0; continue; } else if (hp->h_addrtype != AF_INET) { syslog(LOG_ERR, "%s: address isn't an Internet address", sep->se_hostaddr); sep->se_checked = 0; continue; } else if (hp->h_length != sizeof(struct in_addr)) { syslog(LOG_ERR, "%s: address size wrong (under DNS corruption attack?)", sep->se_hostaddr); sep->se_checked = 0; continue; } else { memcpy(&sep->se_ctrladdr_in.sin_addr, hp->h_addr_list[0], sizeof(struct in_addr)); } } if (ISMUX(sep)) { sep->se_fd = -1; continue; } sep->se_ctrladdr_size = sizeof(sep->se_ctrladdr_in); if (isrpcservice(sep)) { struct rpcent *rp; sep->se_rpcprog = atoi(sep->se_service); if (sep->se_rpcprog == 0) { rp = getrpcbyname(sep->se_service); if (rp == 0) { syslog(LOG_ERR, "%s/%s: unknown service", sep->se_service, sep->se_proto); sep->se_checked = 0; continue; } sep->se_rpcprog = rp->r_number; } if (sep->se_fd == -1 && !ISMUX(sep) && (!sep->se_switched || access_on)) setup(sep); if (sep->se_fd != -1) register_rpc(sep); } else { u_short port = htons(atoi(sep->se_service)); if (!port) { sp = getservbyname(sep->se_service, sep->se_proto); if (sp == 0) { syslog(LOG_ERR, "%s/%s: unknown service", sep->se_service, sep->se_proto); sep->se_checked = 0; continue; } port = sp->s_port; } if (port != sep->se_ctrladdr_in.sin_port) { sep->se_ctrladdr_in.sin_port = port; if (sep->se_fd >= 0) close_sep(sep); } if (sep->se_fd == -1 && !ISMUX(sep) && (!sep->se_switched || access_on)) setup(sep); } } } endconfig(); /* * Purge anything not looked at above. */ sigprocmask(SIG_BLOCK, &sig_block, &omask); sepp = &servtab; while ((sep = *sepp)) { if (sep->se_checked) { sepp = &sep->se_next; continue; } *sepp = sep->se_next; if (sep->se_fd >= 0) close_sep(sep); if (isrpcservice(sep)) unregister_rpc(sep); if (sep->se_family == AF_UNIX) (void)unlink(sep->se_service); if (debug) print_service("FREE", sep); freeconfig(sep); free((char *)sep); } sigprocmask(SIG_SETMASK, &omask, NULL); } void access_switch(signo) int signo; { struct servtab *sep, **sepp; sigset_t omask; int on; on = signo == SIGUSR1; if (on == access_on) return; sigprocmask(SIG_BLOCK, &sig_block, &omask); access_on = on; sepp = &servtab; while (sep = *sepp) { sepp = &sep->se_next; if (!sep->se_switched) continue; if (access_on) setup(sep); else close_sep(sep); } sigprocmask(SIG_SETMASK, &omask, NULL); } void retry(signo) int signo; { struct servtab *sep; timingout = 0; for (sep = servtab; sep; sep = sep->se_next) { if (sep->se_fd == -1 && !ISMUX(sep) && (!sep->se_switched || access_on)) { switch (sep->se_family) { case AF_UNIX: case AF_INET: setup(sep); if (sep->se_fd != -1 && isrpcservice(sep)) register_rpc(sep); break; } } } } void goaway(signo) int signo; { struct servtab *sep; for (sep = servtab; sep; sep = sep->se_next) { if (sep->se_fd == -1) continue; switch (sep->se_family) { case AF_UNIX: (void)unlink(sep->se_service); break; case AF_INET: if (sep->se_wait == 1 && isrpcservice(sep)) unregister_rpc(sep); break; } (void)close(sep->se_fd); } (void)unlink(_PATH_INETDPID); exit(0); } void setup(sep) struct servtab *sep; { int on = 1; if ((sep->se_fd = socket(sep->se_family, sep->se_socktype, 0)) < 0) { if (debug) fprintf(stderr, "socket failed on %s/%s: %s\n", sep->se_service, sep->se_proto, strerror(errno)); syslog(LOG_ERR, "%s/%s: socket: %m", sep->se_service, sep->se_proto); return; } /* Set all listening sockets to close-on-exec. */ if (fcntl(sep->se_fd, F_SETFD, FD_CLOEXEC) < 0) syslog(LOG_ERR, "fcntl (F_SETFD, FD_CLOEXEC): %m"); #define turnon(fd, opt) \ setsockopt(fd, SOL_SOCKET, opt, (char *)&on, sizeof (on)) if (strcmp(sep->se_proto, "tcp") == 0 && (options & SO_DEBUG) && turnon(sep->se_fd, SO_DEBUG) < 0) syslog(LOG_ERR, "setsockopt (SO_DEBUG): %m"); if (turnon(sep->se_fd, SO_REUSEADDR) < 0) syslog(LOG_ERR, "setsockopt (SO_REUSEADDR): %m"); #undef turnon if (bind(sep->se_fd, &sep->se_ctrladdr, sep->se_ctrladdr_size) < 0) { if (debug) fprintf(stderr, "bind failed on %s/%s: %s\n", sep->se_service, sep->se_proto, strerror(errno)); syslog(LOG_ERR, "%s/%s: bind: %m", sep->se_service, sep->se_proto); (void) close(sep->se_fd); sep->se_fd = -1; if (!timingout) { timingout = 1; alarm(RETRYTIME); } return; } if (sep->se_socktype == SOCK_STREAM) listen(sep->se_fd, 10); FD_SET(sep->se_fd, &allsock); nsock++; if (sep->se_fd > maxsock) { maxsock = sep->se_fd; if (maxsock > rlim_ofile_cur - FD_MARGIN) bump_nofile(); } if (debug) fprintf(stderr, "registered %s on %d\n", sep->se_server, sep->se_fd); } /* * Finish with a service and its socket. */ void close_sep(sep) struct servtab *sep; { if (sep->se_fd >= 0) { nsock--; FD_CLR(sep->se_fd, &allsock); (void) close(sep->se_fd); sep->se_fd = -1; } sep->se_count = 0; /* * Don't keep the pid of this running deamon: when reapchild() * reaps this pid, it would erroneously increment nsock. */ if (sep->se_wait > 1) sep->se_wait = 1; } void register_rpc(sep) struct servtab *sep; { #ifdef RPC int n; struct sockaddr_in sin; struct protoent *pp; if ((pp = getprotobyname(sep->se_proto+4)) == NULL) { syslog(LOG_ERR, "%s: getproto: %m", sep->se_proto); return; } n = sizeof sin; if (getsockname(sep->se_fd, (struct sockaddr *)&sin, &n) < 0) { syslog(LOG_ERR, "%s/%s: getsockname: %m", sep->se_service, sep->se_proto); return; } for (n = sep->se_rpcversl; n <= sep->se_rpcversh; n++) { if (debug) fprintf(stderr, "pmap_set: %u %u %u %u\n", sep->se_rpcprog, n, pp->p_proto, ntohs(sin.sin_port)); (void)pmap_unset(sep->se_rpcprog, n); if (!pmap_set(sep->se_rpcprog, n, pp->p_proto, ntohs(sin.sin_port))) syslog(LOG_ERR, "pmap_set: %u %u %u %u: %m", sep->se_rpcprog, n, pp->p_proto, ntohs(sin.sin_port)); } #endif /* RPC */ } void unregister_rpc(sep) struct servtab *sep; { #ifdef RPC int n; for (n = sep->se_rpcversl; n <= sep->se_rpcversh; n++) { if (debug) fprintf(stderr, "pmap_unset(%u, %u)\n", sep->se_rpcprog, n); if (!pmap_unset(sep->se_rpcprog, n)) syslog(LOG_ERR, "pmap_unset(%u, %u)\n", sep->se_rpcprog, n); } #endif /* RPC */ } struct servtab * enter(cp) struct servtab *cp; { struct servtab *sep; sigset_t omask; sep = (struct servtab *)malloc(sizeof (*sep)); if (sep == (struct servtab *)0) { syslog(LOG_ERR, "Out of memory."); exit(-1); } *sep = *cp; sep->se_fd = -1; sep->se_rpcprog = -1; sigprocmask(SIG_BLOCK, &sig_block, &omask); sep->se_next = servtab; servtab = sep; sigprocmask(SIG_SETMASK, &omask, NULL); return (sep); } FILE *fconfig = NULL; struct servtab serv; char line[BUFSIZ]; char *defhost; int setconfig() { if (defhost) free(defhost); defhost = newstr("*"); if (fconfig != NULL) { fseek(fconfig, 0L, SEEK_SET); return (1); } fconfig = fopen(CONFIG, "r"); return (fconfig != NULL); } void endconfig() { if (fconfig) { (void) fclose(fconfig); fconfig = NULL; } if (defhost) { free(defhost); defhost = 0; } } struct servtab * getconfigent() { struct servtab *sep = &serv; int argc; char *cp, *arg; static char TCPMUX_TOKEN[] = "tcpmux/"; #define MUX_LEN (sizeof(TCPMUX_TOKEN)-1) char *hostdelim; more: #ifdef MULOG while ((cp = nextline(fconfig)) && (*cp == '#' || *cp == '\0')) { /* Avoid use of `skip' if there is a danger of it looking * at continuation lines. */ do { cp++; } while (*cp == ' ' || *cp == '\t'); if (*cp == '\0') continue; if ((arg = skip(&cp)) == NULL) continue; if (strcmp(arg, "DOMAIN")) continue; if (curdom) free(curdom); curdom = NULL; while (*cp == ' ' || *cp == '\t') cp++; if (*cp == '\0') continue; arg = cp; while (*cp && *cp != ' ' && *cp != '\t') cp++; if (*cp != '\0') *cp++ = '\0'; curdom = newstr(arg); } #else while ((cp = nextline(fconfig)) && (*cp == '#' || *cp == '\0')) ; #endif if (cp == NULL) return ((struct servtab *)0); /* * clear the static buffer, since some fields (se_ctrladdr, * for example) don't get initialized here. */ memset((caddr_t)sep, 0, sizeof *sep); arg = skip(&cp); if (cp == NULL) { /* got an empty line containing just blanks/tabs. */ goto more; } /* Check for a host name. */ hostdelim = strrchr(arg, ':'); if (hostdelim) { *hostdelim = '\0'; sep->se_hostaddr = newstr(arg); arg = hostdelim + 1; /* * If the line is of the form `host:', then just change the * default host for the following lines. */ if (*arg == '\0') { arg = skip(&cp); if (cp == NULL) { free(defhost); defhost = sep->se_hostaddr; goto more; } } } else sep->se_hostaddr = newstr(defhost); if (strncmp(arg, TCPMUX_TOKEN, MUX_LEN) == 0) { char *c = arg + MUX_LEN; if (*c == '+') { sep->se_type = MUXPLUS_TYPE; c++; } else sep->se_type = MUX_TYPE; sep->se_service = newstr(c); } else { sep->se_service = newstr(arg); sep->se_type = NORM_TYPE; } arg = sskip(&cp); if (strcmp(arg, "stream") == 0) sep->se_socktype = SOCK_STREAM; else if (strcmp(arg, "dgram") == 0) sep->se_socktype = SOCK_DGRAM; else if (strcmp(arg, "rdm") == 0) sep->se_socktype = SOCK_RDM; else if (strcmp(arg, "seqpacket") == 0) sep->se_socktype = SOCK_SEQPACKET; else if (strcmp(arg, "raw") == 0) sep->se_socktype = SOCK_RAW; else sep->se_socktype = -1; sep->se_proto = newstr(sskip(&cp)); if (strcmp(sep->se_proto, "unix") == 0) { sep->se_family = AF_UNIX; } else { sep->se_family = AF_INET; if (strncmp(sep->se_proto, "rpc/", 4) == 0) { #ifdef RPC char *cp, *ccp; cp = strchr(sep->se_service, '/'); if (cp == 0) { syslog(LOG_ERR, "%s: no rpc version", sep->se_service); goto more; } *cp++ = '\0'; sep->se_rpcversl = sep->se_rpcversh = strtol(cp, &ccp, 0); if (ccp == cp) { badafterall: syslog(LOG_ERR, "%s/%s: bad rpc version", sep->se_service, cp); goto more; } if (*ccp == '-') { cp = ccp + 1; sep->se_rpcversh = strtol(cp, &ccp, 0); if (ccp == cp) goto badafterall; } #else syslog(LOG_ERR, "%s: rpc services not suported", sep->se_service); goto more; #endif /* RPC */ } } arg = sskip(&cp); { char *cp; cp = strchr(arg, '.'); if (cp) { *cp++ = '\0'; sep->se_max = atoi(cp); } else sep->se_max = TOOMANY; } sep->se_wait = strcmp(arg, "wait") == 0; if (ISMUX(sep)) { /* * Silently enforce "nowait" for TCPMUX services since * they don't have an assigned port to listen on. */ sep->se_wait = 0; if (strcmp(sep->se_proto, "tcp")) { syslog(LOG_ERR, "%s: bad protocol for tcpmux service %s", CONFIG, sep->se_service); goto more; } if (sep->se_socktype != SOCK_STREAM) { syslog(LOG_ERR, "%s: bad socket type for tcpmux service %s", CONFIG, sep->se_service); goto more; } } arg = sskip(&cp); sep->se_switched = strcmp(arg, "switched") == 0; sep->se_user = newstr(sskip(&cp)); if ((sep->se_group = strchr(sep->se_user, '.'))) *sep->se_group++ = '\0'; sep->se_server = newstr(sskip(&cp)); if (strcmp(sep->se_server, "internal") == 0) { struct biltin *bi; for (bi = biltins; bi->bi_service; bi++) if (bi->bi_socktype == sep->se_socktype && strcmp(bi->bi_service, sep->se_service) == 0) break; if (bi->bi_service == 0) { syslog(LOG_ERR, "internal service %s unknown", sep->se_service); goto more; } sep->se_bi = bi; sep->se_wait = bi->bi_wait; } else sep->se_bi = NULL; argc = 0; for (arg = skip(&cp); cp; arg = skip(&cp)) { #if MULOG char *colon; if (argc == 0 && (colon = strrchr(arg, ':'))) { while (arg < colon) { int x; char *ccp; switch (*arg++) { case 'l': x = 1; if (isdigit(*arg)) { x = strtol(arg, &ccp, 0); if (ccp == arg) break; arg = ccp; } sep->se_log &= ~MULOG_RFC931; sep->se_log |= x; break; case 'a': sep->se_log |= MULOG_RFC931; break; default: break; } } arg = colon + 1; } #endif if (argc < MAXARGV) sep->se_argv[argc++] = newstr(arg); } while (argc <= MAXARGV) sep->se_argv[argc++] = NULL; return (sep); } void freeconfig(cp) struct servtab *cp; { int i; if (cp->se_hostaddr) free(cp->se_hostaddr); if (cp->se_service) free(cp->se_service); if (cp->se_proto) free(cp->se_proto); if (cp->se_user) free(cp->se_user); /* Note: se_group is part of the newstr'ed se_user */ if (cp->se_server) free(cp->se_server); for (i = 0; i < MAXARGV; i++) if (cp->se_argv[i]) free(cp->se_argv[i]); } /* * Safe skip - if skip returns null, log a syntax error in the * configuration file and exit. */ char * sskip(cpp) char **cpp; { char *cp; cp = skip(cpp); if (cp == NULL) { syslog(LOG_ERR, "%s: syntax error", CONFIG); exit(-1); } return (cp); } char * skip(cpp) char **cpp; { char *cp = *cpp; char *start; if (*cpp == NULL) return ((char *)0); again: while (*cp == ' ' || *cp == '\t') cp++; if (*cp == '\0') { int c; c = getc(fconfig); (void) ungetc(c, fconfig); if (c == ' ' || c == '\t') if ((cp = nextline(fconfig))) goto again; *cpp = (char *)0; return ((char *)0); } start = cp; while (*cp && *cp != ' ' && *cp != '\t') cp++; if (*cp != '\0') *cp++ = '\0'; *cpp = cp; return (start); } char * nextline(fd) FILE *fd; { char *cp; if (fgets(line, sizeof (line), fd) == NULL) return ((char *)0); cp = strchr(line, '\n'); if (cp) *cp = '\0'; return (line); } char * newstr(cp) char *cp; { if ((cp = strdup(cp ? cp : ""))) return (cp); syslog(LOG_ERR, "strdup: %m"); exit(-1); } void inetd_setproctitle(a, s) char *a; int s; { int size; char *cp; struct sockaddr_in sin; char buf[80]; cp = Argv[0]; size = sizeof(sin); if (getpeername(s, (struct sockaddr *)&sin, &size) == 0) (void)sprintf(buf, "-%.*s [%s]", sizeof(buf) - 20, a, inet_ntoa(sin.sin_addr)); else (void)sprintf(buf, "-%.*s", sizeof(buf) - 2, a); strncpy(cp, buf, LastArg - cp); cp += strlen(cp); while (cp < LastArg) *cp++ = ' '; } void logpid() { FILE *fp; if ((fp = fopen(_PATH_INETDPID, "w")) != NULL) { fprintf(fp, "%u\n", getpid()); (void)fclose(fp); } } void bump_nofile() { #ifdef RLIMIT_NOFILE #define FD_CHUNK 32 struct rlimit rl; if (getrlimit(RLIMIT_NOFILE, &rl) < 0) { syslog(LOG_ERR, "getrlimit: %m"); return; } #ifndef MIN #define MIN(x,y) ( (x) < (y) ? (x) : (y) ) #endif rl.rlim_cur = MIN(rl.rlim_max, rl.rlim_cur + FD_CHUNK); if (rl.rlim_cur <= rlim_ofile_cur) { syslog(LOG_ERR, "bump_nofile: cannot extend file limit, max = %d", (int)rl.rlim_cur); return; } if (setrlimit(RLIMIT_NOFILE, &rl) < 0) { syslog(LOG_ERR, "setrlimit: %m"); return; } rlim_ofile_cur = rl.rlim_cur; return; #else syslog(LOG_ERR, "bump_nofile: cannot extend file limit"); return; #endif } /* * Internet services provided internally by inetd: */ #define BUFSIZE 4096 /* ARGSUSED */ void echo_stream(s, sep) /* Echo service -- echo data back */ int s; struct servtab *sep; { char buffer[BUFSIZE]; int i; inetd_setproctitle(sep->se_service, s); while ((i = read(s, buffer, sizeof(buffer))) > 0 && write(s, buffer, i) > 0) ; } /* ARGSUSED */ void echo_dg(s, sep) /* Echo service -- echo data back */ int s; struct servtab *sep; { char buffer[BUFSIZE]; int i, size; struct sockaddr sa; size = sizeof(sa); if ((i = recvfrom(s, buffer, sizeof(buffer), 0, &sa, &size)) < 0) return; (void) sendto(s, buffer, i, 0, &sa, sizeof(sa)); } /* ARGSUSED */ void discard_stream(s, sep) /* Discard service -- ignore data */ int s; struct servtab *sep; { char buffer[BUFSIZE]; inetd_setproctitle(sep->se_service, s); while ((errno = 0, read(s, buffer, sizeof(buffer)) > 0) || errno == EINTR) ; } /* ARGSUSED */ void discard_dg(s, sep) /* Discard service -- ignore data */ int s; struct servtab *sep; { char buffer[BUFSIZE]; (void) read(s, buffer, sizeof(buffer)); } #include #define LINESIZ 72 char ring[128]; char *endring; void initring() { int i; endring = ring; for (i = 0; i <= 128; ++i) if (isprint(i)) *endring++ = i; } /* ARGSUSED */ void chargen_stream(s, sep) /* Character generator */ int s; struct servtab *sep; { int len; char *rs, text[LINESIZ+2]; inetd_setproctitle(sep->se_service, s); if (!endring) { initring(); rs = ring; } text[LINESIZ] = '\r'; text[LINESIZ + 1] = '\n'; for (rs = ring;;) { if ((len = endring - rs) >= LINESIZ) memmove(text, rs, LINESIZ); else { memmove(text, rs, len); memmove(text + len, ring, LINESIZ - len); } if (++rs == endring) rs = ring; if (write(s, text, sizeof(text)) != sizeof(text)) break; } } /* ARGSUSED */ void chargen_dg(s, sep) /* Character generator */ int s; struct servtab *sep; { struct sockaddr sa; static char *rs; int len, size; char text[LINESIZ+2]; if (endring == 0) { initring(); rs = ring; } size = sizeof(sa); if (recvfrom(s, text, sizeof(text), 0, &sa, &size) < 0) return; if ((len = endring - rs) >= LINESIZ) memmove(text, rs, LINESIZ); else { memmove(text, rs, len); memmove(text + len, ring, LINESIZ - len); } if (++rs == endring) rs = ring; text[LINESIZ] = '\r'; text[LINESIZ + 1] = '\n'; (void) sendto(s, text, sizeof(text), 0, &sa, sizeof(sa)); } /* * Return a machine readable date and time, in the form of the * number of seconds since midnight, Jan 1, 1900. Since gettimeofday * returns the number of seconds since midnight, Jan 1, 1970, * we must add 2208988800 seconds to this figure to make up for * some seventy years Bell Labs was asleep. */ long machtime() { struct timeval tv; if (gettimeofday(&tv, (struct timezone *)0) < 0) { if (debug) fprintf(stderr, "Unable to get time of day\n"); return (0L); } #define OFFSET ((u_long)25567 * 24*60*60) return (htonl((long)(tv.tv_sec + OFFSET))); #undef OFFSET } /* ARGSUSED */ void machtime_stream(s, sep) int s; struct servtab *sep; { long result; result = machtime(); (void) write(s, (char *) &result, sizeof(result)); } /* ARGSUSED */ void machtime_dg(s, sep) int s; struct servtab *sep; { long result; struct sockaddr sa; int size; size = sizeof(sa); if (recvfrom(s, (char *)&result, sizeof(result), 0, &sa, &size) < 0) return; result = machtime(); (void) sendto(s, (char *) &result, sizeof(result), 0, &sa, sizeof(sa)); } /* ARGSUSED */ void daytime_stream(s, sep) /* Return human-readable time of day */ int s; struct servtab *sep; { char buffer[256]; time_t clock; int len; clock = time((time_t *) 0); len = sprintf(buffer, "%.24s\r\n", ctime(&clock)); (void) write(s, buffer, len); } /* ARGSUSED */ void daytime_dg(s, sep) /* Return human-readable time of day */ int s; struct servtab *sep; { char buffer[256]; time_t clock; struct sockaddr sa; int size, len; clock = time((time_t *) 0); size = sizeof(sa); if (recvfrom(s, buffer, sizeof(buffer), 0, &sa, &size) < 0) return; len = sprintf(buffer, "%.24s\r\n", ctime(&clock)); (void) sendto(s, buffer, len, 0, &sa, sizeof(sa)); } /* * print_service: * Dump relevant information to stderr */ void print_service(action, sep) char *action; struct servtab *sep; { if (isrpcservice(sep)) fprintf(stderr, "%s: %s rpcprog=%d, rpcvers = %d/%d, proto=%s, wait.max=%d.%d, switched=%d, user.group=%s.%s builtin=%lx server=%s\n", action, sep->se_service, sep->se_rpcprog, sep->se_rpcversh, sep->se_rpcversl, sep->se_proto, sep->se_wait, sep->se_max, sep->se_switched, sep->se_user, sep->se_group ? sep->se_group : "", (long)sep->se_bi, sep->se_server); else fprintf(stderr, "%s: %s proto=%s, wait.max=%d.%d, switched=%d, user.group=%s.%s builtin=%lx server=%s\n", action, sep->se_service, sep->se_proto, sep->se_wait, sep->se_max, sep->se_switched, sep->se_user, sep->se_group ? sep->se_group : "", (long)sep->se_bi, sep->se_server); } void usage() { #ifdef LIBWRAP (void)fprintf(stderr, "usage: %s [-dl] [conf]\n", __progname); #else (void)fprintf(stderr, "usage: %s [-d] [conf]\n", __progname); #endif exit(1); } /* * Based on TCPMUX.C by Mark K. Lottor November 1988 * sri-nic::ps:tcpmux.c */ static int /* # of characters upto \r,\n or \0 */ getline(fd, buf, len) int fd; char *buf; int len; { int count = 0, n; do { n = read(fd, buf, len-count); if (n == 0) return (count); if (n < 0) return (-1); while (--n >= 0) { if (*buf == '\r' || *buf == '\n' || *buf == '\0') return (count); count++; buf++; } } while (count < len); return (count); } #define MAX_SERV_LEN (256+2) /* 2 bytes for \r\n */ #define strwrite(fd, buf) (void) write(fd, buf, sizeof(buf)-1) void tcpmux(ctrl, sep) int ctrl; struct servtab *sep; { char service[MAX_SERV_LEN+1]; int len; /* Get requested service name */ if ((len = getline(ctrl, service, MAX_SERV_LEN)) < 0) { strwrite(ctrl, "-Error reading service name\r\n"); goto reject; } service[len] = '\0'; if (debug) fprintf(stderr, "tcpmux: someone wants %s\n", service); /* * Help is a required command, and lists available services, * one per line. */ if (!strcasecmp(service, "help")) { strwrite(ctrl, "+Available services:\r\n"); strwrite(ctrl, "help\r\n"); for (sep = servtab; sep; sep = sep->se_next) { if (!ISMUX(sep)) continue; (void)write(ctrl, sep->se_service, strlen(sep->se_service)); strwrite(ctrl, "\r\n"); } goto reject; } /* Try matching a service in inetd.conf with the request */ for (sep = servtab; sep; sep = sep->se_next) { if (!ISMUX(sep)) continue; if (!strcasecmp(service, sep->se_service)) { if (ISMUXPLUS(sep)) strwrite(ctrl, "+Go\r\n"); run_service(ctrl, sep); return; } } strwrite(ctrl, "-Service not available\r\n"); reject: _exit(1); } #ifdef MULOG dolog(sep, ctrl) struct servtab *sep; int ctrl; { struct sockaddr sa; struct sockaddr_in *sin = (struct sockaddr_in *)&sa; int len = sizeof(sa); struct hostent *hp; char *host, *dp, buf[BUFSIZ], *rfc931_name(); int connected = 1; if (sep->se_family != AF_INET) return; if (getpeername(ctrl, &sa, &len) < 0) { if (errno != ENOTCONN) { syslog(LOG_ERR, "getpeername: %m"); return; } if (recvfrom(ctrl, buf, sizeof(buf), MSG_PEEK, &sa, &len) < 0) { syslog(LOG_ERR, "recvfrom: %m"); return; } connected = 0; } if (sa.sa_family != AF_INET) { syslog(LOG_ERR, "unexpected address family %u", sa.sa_family); return; } hp = gethostbyaddr((char *) &sin->sin_addr.s_addr, sizeof (sin->sin_addr.s_addr), AF_INET); host = hp?hp->h_name:inet_ntoa(sin->sin_addr); switch (sep->se_log & ~MULOG_RFC931) { case 0: return; case 1: if (curdom == NULL || *curdom == '\0') break; dp = host + strlen(host) - strlen(curdom); if (dp < host) break; if (debug) fprintf(stderr, "check \"%s\" against curdom \"%s\"\n", host, curdom); if (strcasecmp(dp, curdom) == 0) return; break; case 2: default: break; } openlog("", LOG_NOWAIT, MULOG); if (connected && (sep->se_log & MULOG_RFC931)) syslog(LOG_INFO, "%s@%s wants %s", rfc931_name(sin, ctrl), host, sep->se_service); else syslog(LOG_INFO, "%s wants %s", host, sep->se_service); } /* * From tcp_log by * Wietse Venema, Eindhoven University of Technology, The Netherlands. */ #if 0 static char sccsid[] = "@(#) rfc931.c 1.3 92/08/31 22:54:46"; #endif #include #define RFC931_PORT 113 /* Semi-well-known port */ #define TIMEOUT 4 #define TIMEOUT2 10 static sigjmp_buf timebuf; /* timeout - handle timeouts */ static void timeout(sig) int sig; { siglongjmp(timebuf, sig); } /* rfc931_name - return remote user name */ char * rfc931_name(there, ctrl) struct sockaddr_in *there; /* remote link information */ int ctrl; { struct sockaddr_in here; /* local link information */ struct sockaddr_in sin; /* for talking to RFC931 daemon */ int length; int s; unsigned remote; unsigned local; static char user[256]; /* XXX */ char buf[256]; char *cp; char *result = "USER_UNKNOWN"; int len; struct sigaction sa; /* Find out local port number of our stdin. */ length = sizeof(here); if (getsockname(ctrl, (struct sockaddr *) &here, &length) == -1) { syslog(LOG_ERR, "getsockname: %m"); return (result); } /* Set up timer so we won't get stuck. */ if ((s = socket(AF_INET, SOCK_STREAM, 0)) == -1) { syslog(LOG_ERR, "socket: %m"); return (result); } sin = here; sin.sin_port = htons(0); if (bind(s, (struct sockaddr *) &sin, sizeof(sin)) == -1) { syslog(LOG_ERR, "bind: %m"); return (result); } memset(&sa, 0, sizeof(sa)); sa_handler = timeout; sigaction(SIGALRM, &sa, NULL); if (sigsetjmp(timebuf)) { close(s); /* not: fclose(fp) */ return (result); } alarm(TIMEOUT); /* Connect to the RFC931 daemon. */ sin = *there; sin.sin_port = htons(RFC931_PORT); if (connect(s, (struct sockaddr *) &sin, sizeof(sin)) == -1) { close(s); alarm(0); return (result); } /* Query the RFC 931 server. Would 13-byte writes ever be broken up? */ (void)sprintf(buf, "%u,%u\r\n", ntohs(there->sin_port), ntohs(here.sin_port)); for (len = 0, cp = buf; len < strlen(buf); ) { int n; if ((n = write(s, cp, strlen(buf) - len)) == -1) { close(s); alarm(0); return (result); } cp += n; len += n; } /* Read response */ for (cp = buf; cp < buf + sizeof(buf) - 1; ) { char c; if (read(s, &c, 1) != 1) { close(s); alarm(0); return (result); } if (c == '\n') break; *cp++ = c; } *cp = '\0'; if (sscanf(buf, "%u , %u : USERID :%*[^:]:%255s", &remote, &local, user) == 3 && ntohs(there->sin_port) == remote && ntohs(here.sin_port) == local) { /* Strip trailing carriage return. */ if (cp = strchr(user, '\r')) *cp = 0; result = user; } alarm(0); close(s); return (result); } #endif