/* * 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. */ #ifndef lint static const char copyright[] = "@(#) Copyright (c) 1983, 1991, 1993, 1994\n\ The Regents of the University of California. All rights reserved.\n"; #endif /* not lint */ #ifndef lint #if 0 static char sccsid[] = "@(#)from: inetd.c 8.4 (Berkeley) 4/13/94"; #endif static const char rcsid[] = "$Id: inetd.c,v 1.65 1999/07/22 14:47:29 sheldonh Exp $"; #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 single-threaded/multi-threaded * user user to run daemon as * server program full path name * server program arguments maximum of MAXARGS (20) * * 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. * * 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 single-threaded/multi-threaded * user user to run daemon as * server program full path name * server program arguments maximum of MAXARGS * * Comment lines are indicated by a `#' in column 1. */ #include #include #include #include #include #include #include #include #include #include #include #include #include #include #include #include #include #include #include #include #include #include #include #include #include #include "inetd.h" #include "pathnames.h" #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 #define ISWRAP(sep) \ ( ((wrap_ex && !(sep)->se_bi) || (wrap_bi && (sep)->se_bi)) \ && ( ((sep)->se_accept && (sep)->se_socktype == SOCK_STREAM) \ || (sep)->se_socktype == SOCK_DGRAM)) #define LARGEST(x,y) ((x) > (y) ? (x) : (y)) #ifdef LOGIN_CAP #include /* see init.c */ #define RESOURCE_RC "daemon" #endif #ifndef MAXCHILD #define MAXCHILD -1 /* maximum number of this service < 0 = no limit */ #endif #ifndef MAXCPM #define MAXCPM -1 /* rate limit invocations from a single remote address, < 0 = no limit */ #endif #define TOOMANY 256 /* 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 */ #define MAX_MAXCHLD 32767 /* max allowable max children */ #define SIGBLOCK (sigmask(SIGCHLD)|sigmask(SIGHUP)|sigmask(SIGALRM)) int allow_severity; int deny_severity; int wrap_ex = 0; int wrap_bi = 0; int debug = 0; int log = 0; int nsock; int maxsock; /* highest-numbered descriptor */ fd_set allsock; int options; int timingout; int toomany = TOOMANY; int maxchild = MAXCHILD; int maxcpm = MAXCPM; struct servent *sp; struct rpcent *rpc; struct in_addr bind_address; int signalpipe[2]; struct servtab *servtab; extern struct biltin biltins[]; #define NUMINT (sizeof(intab) / sizeof(struct inent)) char *CONFIG = _PATH_INETDCONF; char *pid_file = _PATH_INETDPID; #ifdef OLD_SETPROCTITLE char **Argv; char *LastArg; #endif int getvalue(arg, value, whine) char *arg, *whine; int *value; { int tmp; char *p; tmp = strtol(arg, &p, 0); if (tmp < 1 || *p) { syslog(LOG_ERR, whine, arg); return 1; /* failure */ } *value = tmp; return 0; /* success */ } int main(argc, argv, envp) int argc; char *argv[], *envp[]; { struct servtab *sep; struct passwd *pwd; struct group *grp; struct sigaction sa, saalrm, sachld, sahup, sapipe; int tmpint, ch, dofork; pid_t pid; char buf[50]; #ifdef LOGIN_CAP login_cap_t *lc = NULL; #endif struct request_info req; int denied; char *service = NULL; char *pnm; struct sockaddr_in peer; int i; #ifdef OLD_SETPROCTITLE Argv = argv; if (envp == 0 || *envp == 0) envp = argv; while (*envp) envp++; LastArg = envp[-1] + strlen(envp[-1]); #endif openlog("inetd", LOG_PID | LOG_NOWAIT, LOG_DAEMON); bind_address.s_addr = htonl(INADDR_ANY); while ((ch = getopt(argc, argv, "dlwWR:a:c:C:p:")) != -1) switch(ch) { case 'd': debug = 1; options |= SO_DEBUG; break; case 'l': log = 1; break; case 'R': getvalue(optarg, &toomany, "-R %s: bad value for service invocation rate"); break; case 'c': getvalue(optarg, &maxchild, "-c %s: bad value for maximum children"); break; case 'C': getvalue(optarg, &maxcpm, "-C %s: bad value for maximum children/minute"); break; case 'a': if (!inet_aton(optarg, &bind_address)) { syslog(LOG_ERR, "-a %s: invalid IP address", optarg); exit(EX_USAGE); } break; case 'p': pid_file = optarg; break; case 'w': wrap_ex++; break; case 'W': wrap_bi++; break; case '?': default: syslog(LOG_ERR, "usage: inetd [-dlwW] [-a address] [-R rate]" " [-c maximum] [-C rate]" " [-p pidfile] [conf-file]"); exit(EX_USAGE); } argc -= optind; argv += optind; if (argc > 0) CONFIG = argv[0]; if (debug == 0) { FILE *fp; if (daemon(0, 0) < 0) { syslog(LOG_WARNING, "daemon(0,0) failed: %m"); } /* * In case somebody has started inetd manually, we need to * clear the logname, so that old servers run as root do not * get the user's logname.. */ if (setlogin("") < 0) { syslog(LOG_WARNING, "cannot clear logname: %m"); /* no big deal if it fails.. */ } pid = getpid(); fp = fopen(pid_file, "w"); if (fp) { fprintf(fp, "%ld\n", (long)pid); fclose(fp); } else { syslog(LOG_WARNING, "%s: %m", pid_file); } } sa.sa_flags = 0; sigemptyset(&sa.sa_mask); sigaddset(&sa.sa_mask, SIGALRM); sigaddset(&sa.sa_mask, SIGCHLD); sigaddset(&sa.sa_mask, SIGHUP); sa.sa_handler = flag_retry; sigaction(SIGALRM, &sa, &saalrm); config(); sa.sa_handler = flag_config; sigaction(SIGHUP, &sa, &sahup); sa.sa_handler = flag_reapchild; sigaction(SIGCHLD, &sa, &sachld); sa.sa_handler = SIG_IGN; sigaction(SIGPIPE, &sa, &sapipe); { /* 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); } if (pipe(signalpipe) != 0) { syslog(LOG_ERR, "pipe: %%m"); exit(EX_OSERR); } FD_SET(signalpipe[0], &allsock); nsock++; if (signalpipe[0] > maxsock || signalpipe[1] > maxsock) maxsock = LARGEST(signalpipe[0], signalpipe[1]); for (;;) { int n, ctrl; fd_set readable; if (nsock == 0) { syslog(LOG_ERR, "%s: nsock=0", __FUNCTION__); exit(EX_SOFTWARE); } readable = allsock; if ((n = select(maxsock + 1, &readable, (fd_set *)0, (fd_set *)0, (struct timeval *)0)) <= 0) { if (n < 0 && errno != EINTR) { syslog(LOG_WARNING, "select: %m"); sleep(1); } continue; } /* handle any queued signal flags */ if (FD_ISSET(signalpipe[0], &readable)) { int n; if (ioctl(signalpipe[0], FIONREAD, &n) != 0) { syslog(LOG_ERR, "ioctl: %m"); exit(EX_OSERR); } while (--n >= 0) { char c; if (read(signalpipe[0], &c, 1) != 1) { syslog(LOG_ERR, "read: %m"); exit(EX_OSERR); } if (debug) warnx("Handling signal flag %c", c); switch(c) { case 'A': /* sigalrm */ retry(); break; case 'C': /* sigchld */ reapchild(); break; case 'H': /* sighup */ config(); break; } } } for (sep = servtab; n && sep; sep = sep->se_next) if (sep->se_fd != -1 && FD_ISSET(sep->se_fd, &readable)) { n--; if (debug) warnx("someone wants %s", sep->se_service); if (sep->se_accept && sep->se_socktype == SOCK_STREAM) { ctrl = accept(sep->se_fd, (struct sockaddr *)0, (int *)0); if (debug) warnx("accept, ctrl %d", ctrl); if (ctrl < 0) { if (errno != EINTR) syslog(LOG_WARNING, "accept (for %s): %m", sep->se_service); if (sep->se_accept && sep->se_socktype == SOCK_STREAM) close(ctrl); continue; } if (cpmip(sep, ctrl) < 0) { close(ctrl); continue; } } else ctrl = sep->se_fd; if (log && !ISWRAP(sep)) { pnm = "unknown"; i = sizeof peer; if (getpeername(ctrl, (struct sockaddr *) &peer, &i)) { i = sizeof peer; if (recvfrom(ctrl, buf, sizeof(buf), MSG_PEEK, (struct sockaddr *)&peer, &i) >= 0) pnm = inet_ntoa(peer.sin_addr); } else pnm = inet_ntoa(peer.sin_addr); syslog(LOG_INFO,"%s from %s", sep->se_service, pnm); } (void) sigblock(SIGBLOCK); pid = 0; /* * Fork for all external services, builtins which need to * fork and anything we're wrapping (as wrapping might * block or use hosts_options(5) twist). */ dofork = !sep->se_bi || sep->se_bi->bi_fork || ISWRAP(sep); if (dofork) { if (sep->se_count++ == 0) (void)gettimeofday(&sep->se_time, (struct timezone *)NULL); else if (sep->se_count >= toomany) { struct timeval now; (void)gettimeofday(&now, (struct timezone *)NULL); 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", sep->se_service, sep->se_proto); close_sep(sep); sigsetmask(0L); if (!timingout) { timingout = 1; alarm(RETRYTIME); } continue; } } pid = fork(); } if (pid < 0) { syslog(LOG_ERR, "fork: %m"); if (sep->se_accept && sep->se_socktype == SOCK_STREAM) close(ctrl); sigsetmask(0L); sleep(1); continue; } if (pid) addchild(sep, pid); sigsetmask(0L); if (pid == 0) { if (dofork) { if (debug) warnx("+ closing from %d", maxsock); for (tmpint = maxsock; tmpint > 2; tmpint--) if (tmpint != ctrl) (void) close(tmpint); sigaction(SIGALRM, &saalrm, (struct sigaction *)0); sigaction(SIGCHLD, &sachld, (struct sigaction *)0); sigaction(SIGHUP, &sahup, (struct sigaction *)0); /* SIGPIPE reset before exec */ } /* * Call tcpmux to find the real service to exec. */ if (sep->se_bi && sep->se_bi->bi_fn == (void (*)()) tcpmux) { sep = tcpmux(ctrl); if (sep == NULL) { close(ctrl); _exit(0); } } if (ISWRAP(sep)) { inetd_setproctitle("wrapping", ctrl); service = sep->se_server_name ? sep->se_server_name : sep->se_service; request_init(&req, RQ_DAEMON, service, RQ_FILE, ctrl, NULL); fromhost(&req); deny_severity = LIBWRAP_DENY_FACILITY|LIBWRAP_DENY_SEVERITY; allow_severity = LIBWRAP_ALLOW_FACILITY|LIBWRAP_ALLOW_SEVERITY; denied = !hosts_access(&req); if (denied) { syslog(deny_severity, "refused connection from %.500s, service %s (%s)", eval_client(&req), service, sep->se_proto); if (sep->se_socktype != SOCK_STREAM) recv(ctrl, buf, sizeof (buf), 0); if (dofork) _exit(0); } if (log) { syslog(allow_severity, "connection from %.500s, service %s (%s)", eval_client(&req), service, sep->se_proto); } } if (sep->se_bi) { (*sep->se_bi->bi_fn)(ctrl, sep); } else { if (debug) warnx("%d execl %s", getpid(), sep->se_server); dup2(ctrl, 0); close(ctrl); dup2(0, 1); dup2(0, 2); 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); if (sep->se_socktype != SOCK_STREAM) recv(0, buf, sizeof (buf), 0); _exit(EX_NOUSER); } grp = NULL; if ( sep->se_group != NULL && (grp = getgrnam(sep->se_group)) == NULL ) { syslog(LOG_ERR, "%s/%s: %s: No such group", sep->se_service, sep->se_proto, sep->se_group); if (sep->se_socktype != SOCK_STREAM) recv(0, buf, sizeof (buf), 0); _exit(EX_NOUSER); } if (grp != NULL) pwd->pw_gid = grp->gr_gid; #ifdef LOGIN_CAP if ((lc = login_getclass(sep->se_class)) == NULL) { /* error syslogged by getclass */ syslog(LOG_ERR, "%s/%s: %s: login class error", sep->se_service, sep->se_proto, sep->se_class); if (sep->se_socktype != SOCK_STREAM) recv(0, buf, sizeof (buf), 0); _exit(EX_NOUSER); } #endif if (setsid() < 0) { syslog(LOG_ERR, "%s: can't setsid(): %m", sep->se_service); /* _exit(EX_OSERR); not fatal yet */ } #ifdef LOGIN_CAP if (setusercontext(lc, pwd, pwd->pw_uid, LOGIN_SETALL) != 0) { syslog(LOG_ERR, "%s: can't setusercontext(..%s..): %m", sep->se_service, sep->se_user); _exit(EX_OSERR); } #else if (pwd->pw_uid) { if (setlogin(sep->se_user) < 0) { syslog(LOG_ERR, "%s: can't setlogin(%s): %m", sep->se_service, sep->se_user); /* _exit(EX_OSERR); not yet */ } if (setgid(pwd->pw_gid) < 0) { syslog(LOG_ERR, "%s: can't set gid %d: %m", sep->se_service, pwd->pw_gid); _exit(EX_OSERR); } (void) initgroups(pwd->pw_name, pwd->pw_gid); if (setuid(pwd->pw_uid) < 0) { syslog(LOG_ERR, "%s: can't set uid %d: %m", sep->se_service, pwd->pw_uid); _exit(EX_OSERR); } } #endif sigaction(SIGPIPE, &sapipe, (struct sigaction *)0); execv(sep->se_server, sep->se_argv); syslog(LOG_ERR, "cannot execute %s: %m", sep->se_server); if (sep->se_socktype != SOCK_STREAM) recv(0, buf, sizeof (buf), 0); } if (dofork) _exit(0); } if (sep->se_accept && sep->se_socktype == SOCK_STREAM) close(ctrl); } } } /* * Add a signal flag to the signal flag queue for later handling */ void flag_signal(c) char c; { if (write(signalpipe[1], &c, 1) != 1) { syslog(LOG_ERR, "write: %m"); _exit(EX_OSERR); } } /* * Record a new child pid for this service. If we've reached the * limit on children, then stop accepting incoming requests. */ void addchild(struct servtab *sep, pid_t pid) { #ifdef SANITY_CHECK if (sep->se_numchild >= sep->se_maxchild) { syslog(LOG_ERR, "%s: %d >= %d", __FUNCTION__, sep->se_numchild, sep->se_maxchild); exit(EX_SOFTWARE); } #endif if (sep->se_maxchild == 0) return; sep->se_pids[sep->se_numchild++] = pid; if (sep->se_numchild == sep->se_maxchild) disable(sep); } /* * Some child process has exited. See if it's on somebody's list. */ void flag_reapchild(signo) int signo; { flag_signal('C'); } void reapchild() { int k, status; pid_t pid; struct servtab *sep; for (;;) { pid = wait3(&status, WNOHANG, (struct rusage *)0); if (pid <= 0) break; if (debug) warnx("%d reaped, status %#x", pid, status); for (sep = servtab; sep; sep = sep->se_next) { for (k = 0; k < sep->se_numchild; k++) if (sep->se_pids[k] == pid) break; if (k == sep->se_numchild) continue; if (sep->se_numchild == sep->se_maxchild) enable(sep); sep->se_pids[k] = sep->se_pids[--sep->se_numchild]; if (status) syslog(LOG_WARNING, "%s[%d]: exit status 0x%x", sep->se_server, pid, status); break; } } } void flag_config(signo) int signo; { flag_signal('H'); } void config() { struct servtab *sep, *new, **sepp; long omask; if (!setconfig()) { syslog(LOG_ERR, "%s: %m", CONFIG); return; } for (sep = servtab; sep; sep = sep->se_next) sep->se_checked = 0; while ((new = getconfigent())) { if (getpwnam(new->se_user) == NULL) { syslog(LOG_ERR, "%s/%s: No such user '%s', service ignored", new->se_service, new->se_proto, new->se_user); continue; } if (new->se_group && getgrnam(new->se_group) == NULL) { syslog(LOG_ERR, "%s/%s: No such group '%s', service ignored", new->se_service, new->se_proto, new->se_group); continue; } #ifdef LOGIN_CAP if (login_getclass(new->se_class) == NULL) { /* error syslogged by getclass */ syslog(LOG_ERR, "%s/%s: %s: login class error, service ignored", new->se_service, new->se_proto, new->se_class); continue; } #endif for (sep = servtab; sep; sep = sep->se_next) if (strcmp(sep->se_service, new->se_service) == 0 && strcmp(sep->se_proto, new->se_proto) == 0) break; if (sep != 0) { int i; #define SWAP(a, b) { typeof(a) c = a; a = b; b = c; } omask = sigblock(SIGBLOCK); /* copy over outstanding child pids */ if (sep->se_maxchild && new->se_maxchild) { new->se_numchild = sep->se_numchild; if (new->se_numchild > new->se_maxchild) new->se_numchild = new->se_maxchild; memcpy(new->se_pids, sep->se_pids, new->se_numchild * sizeof(*new->se_pids)); } SWAP(sep->se_pids, new->se_pids); sep->se_maxchild = new->se_maxchild; sep->se_numchild = new->se_numchild; sep->se_maxcpm = new->se_maxcpm; /* might need to turn on or off service now */ if (sep->se_fd >= 0) { if (sep->se_maxchild && sep->se_numchild == sep->se_maxchild) { if (FD_ISSET(sep->se_fd, &allsock)) disable(sep); } else { if (!FD_ISSET(sep->se_fd, &allsock)) enable(sep); } } sep->se_accept = new->se_accept; SWAP(sep->se_user, new->se_user); SWAP(sep->se_group, new->se_group); #ifdef LOGIN_CAP SWAP(sep->se_class, new->se_class); #endif SWAP(sep->se_server, new->se_server); SWAP(sep->se_server_name, new->se_server_name); for (i = 0; i < MAXARGV; i++) SWAP(sep->se_argv[i], new->se_argv[i]); sigsetmask(omask); freeconfig(new); if (debug) print_service("REDO", sep); } else { sep = enter(new); if (debug) print_service("ADD ", sep); } sep->se_checked = 1; if (ISMUX(sep)) { sep->se_fd = -1; continue; } if (!sep->se_rpc) { 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; } if (sp->s_port != sep->se_ctrladdr.sin_port) { sep->se_ctrladdr.sin_family = AF_INET; sep->se_ctrladdr.sin_addr = bind_address; sep->se_ctrladdr.sin_port = sp->s_port; if (sep->se_fd >= 0) close_sep(sep); } } else { rpc = getrpcbyname(sep->se_service); if (rpc == 0) { syslog(LOG_ERR, "%s/%s unknown RPC service.", sep->se_service, sep->se_proto); if (sep->se_fd != -1) (void) close(sep->se_fd); sep->se_fd = -1; continue; } if (rpc->r_number != sep->se_rpc_prog) { if (sep->se_rpc_prog) unregisterrpc(sep); sep->se_rpc_prog = rpc->r_number; if (sep->se_fd != -1) (void) close(sep->se_fd); sep->se_fd = -1; } } if (sep->se_fd == -1) setup(sep); } endconfig(); /* * Purge anything not looked at above. */ omask = sigblock(SIGBLOCK); 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 (debug) print_service("FREE", sep); if (sep->se_rpc && sep->se_rpc_prog > 0) unregisterrpc(sep); freeconfig(sep); free((char *)sep); } (void) sigsetmask(omask); } void unregisterrpc(sep) struct servtab *sep; { int i; struct servtab *sepp; long omask; omask = sigblock(SIGBLOCK); for (sepp = servtab; sepp; sepp = sepp->se_next) { if (sepp == sep) continue; if (sep->se_checked == 0 || !sepp->se_rpc || sep->se_rpc_prog != sepp->se_rpc_prog) continue; return; } if (debug) print_service("UNREG", sep); for (i = sep->se_rpc_lowvers; i <= sep->se_rpc_highvers; i++) pmap_unset(sep->se_rpc_prog, i); if (sep->se_fd != -1) (void) close(sep->se_fd); sep->se_fd = -1; (void) sigsetmask(omask); } void flag_retry(signo) int signo; { flag_signal('A'); } void retry() { struct servtab *sep; timingout = 0; for (sep = servtab; sep; sep = sep->se_next) if (sep->se_fd == -1 && !ISMUX(sep)) setup(sep); } void setup(sep) struct servtab *sep; { int on = 1; if ((sep->se_fd = socket(AF_INET, sep->se_socktype, 0)) < 0) { if (debug) warn("socket failed on %s/%s", sep->se_service, sep->se_proto); syslog(LOG_ERR, "%s/%s: socket: %m", sep->se_service, sep->se_proto); return; } #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"); #ifdef SO_PRIVSTATE if (turnon(sep->se_fd, SO_PRIVSTATE) < 0) syslog(LOG_ERR, "setsockopt (SO_PRIVSTATE): %m"); #endif #undef turnon if (sep->se_type == TTCP_TYPE) if (setsockopt(sep->se_fd, IPPROTO_TCP, TCP_NOPUSH, (char *)&on, sizeof (on)) < 0) syslog(LOG_ERR, "setsockopt (TCP_NOPUSH): %m"); if (bind(sep->se_fd, (struct sockaddr *)&sep->se_ctrladdr, sizeof (sep->se_ctrladdr)) < 0) { if (debug) warn("bind failed on %s/%s", sep->se_service, sep->se_proto); 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_rpc) { int i, len = sizeof(struct sockaddr); if (getsockname(sep->se_fd, (struct sockaddr*)&sep->se_ctrladdr, &len) < 0){ syslog(LOG_ERR, "%s/%s: getsockname: %m", sep->se_service, sep->se_proto); (void) close(sep->se_fd); sep->se_fd = -1; return; } if (debug) print_service("REG ", sep); for (i = sep->se_rpc_lowvers; i <= sep->se_rpc_highvers; i++) { pmap_unset(sep->se_rpc_prog, i); pmap_set(sep->se_rpc_prog, i, (sep->se_socktype == SOCK_DGRAM) ? IPPROTO_UDP : IPPROTO_TCP, ntohs(sep->se_ctrladdr.sin_port)); } } if (sep->se_socktype == SOCK_STREAM) listen(sep->se_fd, 64); enable(sep); if (debug) { warnx("registered %s on %d", 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) { if (FD_ISSET(sep->se_fd, &allsock)) disable(sep); (void) close(sep->se_fd); sep->se_fd = -1; } sep->se_count = 0; sep->se_numchild = 0; /* forget about any existing children */ } int matchservent(name1, name2, proto) char *name1, *name2, *proto; { char **alias; struct servent *se; if ((se = getservbyname(name1, proto)) != NULL) { if (strcmp(name2, se->s_name) == 0) return(1); for (alias = se->s_aliases; *alias; alias++) if (strcmp(name2, *alias) == 0) return(1); } return(0); } struct servtab * enter(cp) struct servtab *cp; { struct servtab *sep; long omask; sep = (struct servtab *)malloc(sizeof (*sep)); if (sep == (struct servtab *)0) { syslog(LOG_ERR, "Out of memory."); exit(EX_OSERR); } *sep = *cp; sep->se_fd = -1; omask = sigblock(SIGBLOCK); sep->se_next = servtab; servtab = sep; sigsetmask(omask); return (sep); } void enable(struct servtab *sep) { if (debug) warnx( "enabling %s, fd %d", sep->se_service, sep->se_fd); #ifdef SANITY_CHECK if (sep->se_fd < 0) { syslog(LOG_ERR, "%s: %s: bad fd", __FUNCTION__, sep->se_service); exit(EX_SOFTWARE); } if (ISMUX(sep)) { syslog(LOG_ERR, "%s: %s: is mux", __FUNCTION__, sep->se_service); exit(EX_SOFTWARE); } if (FD_ISSET(sep->se_fd, &allsock)) { syslog(LOG_ERR, "%s: %s: not off", __FUNCTION__, sep->se_service); exit(EX_SOFTWARE); } #endif FD_SET(sep->se_fd, &allsock); nsock++; if (sep->se_fd > maxsock) maxsock = sep->se_fd; } void disable(struct servtab *sep) { if (debug) warnx( "disabling %s, fd %d", sep->se_service, sep->se_fd); #ifdef SANITY_CHECK if (sep->se_fd < 0) { syslog(LOG_ERR, "%s: %s: bad fd", __FUNCTION__, sep->se_service); exit(EX_SOFTWARE); } if (ISMUX(sep)) { syslog(LOG_ERR, "%s: %s: is mux", __FUNCTION__, sep->se_service); exit(EX_SOFTWARE); } if (!FD_ISSET(sep->se_fd, &allsock)) { syslog(LOG_ERR, "%s: %s: not on", __FUNCTION__, sep->se_service); exit(EX_SOFTWARE); } if (nsock == 0) { syslog(LOG_ERR, "%s: nsock=0", __FUNCTION__); exit(EX_SOFTWARE); } #endif FD_CLR(sep->se_fd, &allsock); nsock--; if (sep->se_fd == maxsock) maxsock--; } FILE *fconfig = NULL; struct servtab serv; char line[LINE_MAX]; int setconfig() { 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; } } struct servtab * getconfigent() { struct servtab *sep = &serv; int argc; char *cp, *arg, *s; char *versp; static char TCPMUX_TOKEN[] = "tcpmux/"; #define MUX_LEN (sizeof(TCPMUX_TOKEN)-1) more: while ((cp = nextline(fconfig)) && (*cp == '#' || *cp == '\0')) ; 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; } 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; arg = sskip(&cp); if (strcmp(arg, "tcp/ttcp") == 0) { sep->se_type = TTCP_TYPE; sep->se_proto = newstr("tcp"); } else { sep->se_proto = newstr(arg); } if (strncmp(sep->se_proto, "rpc/", 4) == 0) { memmove(sep->se_proto, sep->se_proto + 4, strlen(sep->se_proto) + 1 - 4); sep->se_rpc = 1; sep->se_rpc_prog = sep->se_rpc_lowvers = sep->se_rpc_lowvers = 0; sep->se_ctrladdr.sin_family = AF_INET; sep->se_ctrladdr.sin_port = 0; sep->se_ctrladdr.sin_addr = bind_address; if ((versp = rindex(sep->se_service, '/'))) { *versp++ = '\0'; switch (sscanf(versp, "%d-%d", &sep->se_rpc_lowvers, &sep->se_rpc_highvers)) { case 2: break; case 1: sep->se_rpc_highvers = sep->se_rpc_lowvers; break; default: syslog(LOG_ERR, "bad RPC version specifier; %s\n", sep->se_service); freeconfig(sep); goto more; } } else { sep->se_rpc_lowvers = sep->se_rpc_highvers = 1; } } arg = sskip(&cp); if (!strncmp(arg, "wait", 4)) sep->se_accept = 0; else if (!strncmp(arg, "nowait", 6)) sep->se_accept = 1; else { syslog(LOG_ERR, "%s: bad wait/nowait for service %s", CONFIG, sep->se_service); goto more; } sep->se_maxchild = -1; sep->se_maxcpm = -1; if ((s = strchr(arg, '/')) != NULL) { char *eptr; u_long val; val = strtoul(s + 1, &eptr, 10); if (eptr == s + 1 || val > MAX_MAXCHLD) { syslog(LOG_ERR, "%s: bad max-child for service %s", CONFIG, sep->se_service); goto more; } if (debug) if (!sep->se_accept && val != 1) warnx("maxchild=%lu for wait service %s" " not recommended", val, sep->se_service); sep->se_maxchild = val; if (*eptr == '/') sep->se_maxcpm = strtol(eptr + 1, &eptr, 10); /* * explicitly do not check for \0 for future expansion / * backwards compatibility */ } if (ISMUX(sep)) { /* * Silently enforce "nowait" mode for TCPMUX services * since they don't have an assigned port to listen on. */ sep->se_accept = 1; 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; } } sep->se_user = newstr(sskip(&cp)); #ifdef LOGIN_CAP if ((s = strrchr(sep->se_user, '/')) != NULL) { *s = '\0'; sep->se_class = newstr(s + 1); } else sep->se_class = newstr(RESOURCE_RC); #endif if ((s = strrchr(sep->se_user, ':')) != NULL) { *s = '\0'; sep->se_group = newstr(s + 1); } else sep->se_group = NULL; sep->se_server = newstr(sskip(&cp)); if ((sep->se_server_name = rindex(sep->se_server, '/'))) sep->se_server_name++; 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) || matchservent(bi->bi_service, sep->se_service, sep->se_proto)) break; if (bi->bi_service == 0) { syslog(LOG_ERR, "internal service %s unknown", sep->se_service); goto more; } sep->se_accept = 1; /* force accept mode for built-ins */ sep->se_bi = bi; } else sep->se_bi = NULL; if (sep->se_maxcpm < 0) sep->se_maxcpm = maxcpm; if (sep->se_maxchild < 0) { /* apply default max-children */ if (sep->se_bi && sep->se_bi->bi_maxchild >= 0) sep->se_maxchild = sep->se_bi->bi_maxchild; else if (sep->se_accept) sep->se_maxchild = maxchild > 0 ? maxchild : 0; else sep->se_maxchild = 1; } if (sep->se_maxchild) { sep->se_pids = malloc(sep->se_maxchild * sizeof(*sep->se_pids)); if (sep->se_pids == NULL) { syslog(LOG_ERR, "Out of memory."); exit(EX_OSERR); } } argc = 0; for (arg = skip(&cp); cp; arg = skip(&cp)) if (argc < MAXARGV) { sep->se_argv[argc++] = newstr(arg); } else { syslog(LOG_ERR, "%s: too many arguments for service %s", CONFIG, sep->se_service); goto more; } while (argc <= MAXARGV) sep->se_argv[argc++] = NULL; return (sep); } void freeconfig(cp) struct servtab *cp; { int i; if (cp->se_service) free(cp->se_service); if (cp->se_proto) free(cp->se_proto); if (cp->se_user) free(cp->se_user); if (cp->se_group) free(cp->se_group); #ifdef LOGIN_CAP if (cp->se_class) free(cp->se_class); #endif if (cp->se_server) free(cp->se_server); if (cp->se_pids) free(cp->se_pids); 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(EX_DATAERR); } return (cp); } char * skip(cpp) char **cpp; { char *cp = *cpp; char *start; char quote = '\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); } if (*cp == '"' || *cp == '\'') quote = *cp++; start = cp; if (quote) while (*cp && *cp != quote) cp++; else 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(EX_OSERR); } #ifdef OLD_SETPROCTITLE 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]", a, inet_ntoa(sin.sin_addr)); else (void) sprintf(buf, "-%s", a); strncpy(cp, buf, LastArg - cp); cp += strlen(cp); while (cp < LastArg) *cp++ = ' '; } #else void inetd_setproctitle(a, s) char *a; int s; { int size; struct sockaddr_in sin; char buf[80]; size = sizeof(sin); if (getpeername(s, (struct sockaddr *)&sin, &size) == 0) (void) sprintf(buf, "%s [%s]", a, inet_ntoa(sin.sin_addr)); else (void) sprintf(buf, "%s", a); setproctitle("%s", buf); } #endif /* * Internet services provided internally by inetd: */ int check_loop(sin, sep) struct sockaddr_in *sin; struct servtab *sep; { struct servtab *se2; for (se2 = servtab; se2; se2 = se2->se_next) { if (!se2->se_bi || se2->se_socktype != SOCK_DGRAM) continue; if (sin->sin_port == se2->se_ctrladdr.sin_port) { syslog(LOG_WARNING, "%s/%s:%s/%s loop request REFUSED from %s", sep->se_service, sep->se_proto, se2->se_service, se2->se_proto, inet_ntoa(sin->sin_addr)); return 1; } } return 0; } /* * print_service: * Dump relevant information to stderr */ void print_service(action, sep) char *action; struct servtab *sep; { fprintf(stderr, #ifdef LOGIN_CAP "%s: %s proto=%s accept=%d max=%d user=%s group=%s class=%s builtin=%p server=%s\n", #else "%s: %s proto=%s accept=%d max=%d user=%s group=%s builtin=%p server=%s\n", #endif action, sep->se_service, sep->se_proto, sep->se_accept, sep->se_maxchild, sep->se_user, sep->se_group, #ifdef LOGIN_CAP sep->se_class, #endif (void *) sep->se_bi, sep->se_server); } #define CPMHSIZE 256 #define CPMHMASK (CPMHSIZE-1) #define CHTGRAN 10 #define CHTSIZE 6 typedef struct CTime { unsigned long ct_Ticks; int ct_Count; } CTime; typedef struct CHash { struct in_addr ch_Addr; time_t ch_LTime; char *ch_Service; CTime ch_Times[CHTSIZE]; } CHash; CHash CHashAry[CPMHSIZE]; int cpmip(sep, ctrl) struct servtab *sep; int ctrl; { struct sockaddr_in rsin; int rsinLen = sizeof(rsin); int r = 0; /* * If getpeername() fails, just let it through (if logging is * enabled the condition is caught elsewhere) */ if (sep->se_maxcpm > 0 && getpeername(ctrl, (struct sockaddr *)&rsin, &rsinLen) == 0 ) { time_t t = time(NULL); int hv = 0xABC3D20F; int i; int cnt = 0; CHash *chBest = NULL; unsigned int ticks = t / CHTGRAN; { char *p; int i; for (i = 0, p = (char *)&rsin.sin_addr; i < sizeof(rsin.sin_addr); ++i, ++p) { hv = (hv << 5) ^ (hv >> 23) ^ *p; } hv = (hv ^ (hv >> 16)); } for (i = 0; i < 5; ++i) { CHash *ch = &CHashAry[(hv + i) & CPMHMASK]; if (rsin.sin_addr.s_addr == ch->ch_Addr.s_addr && ch->ch_Service && strcmp(sep->se_service, ch->ch_Service) == 0) { chBest = ch; break; } if (chBest == NULL || ch->ch_LTime == 0 || ch->ch_LTime < chBest->ch_LTime) { chBest = ch; } } if (rsin.sin_addr.s_addr != chBest->ch_Addr.s_addr || chBest->ch_Service == NULL || strcmp(sep->se_service, chBest->ch_Service) != 0) { chBest->ch_Addr = rsin.sin_addr; if (chBest->ch_Service) free(chBest->ch_Service); chBest->ch_Service = strdup(sep->se_service); bzero(chBest->ch_Times, sizeof(chBest->ch_Times)); } chBest->ch_LTime = t; { CTime *ct = &chBest->ch_Times[ticks % CHTSIZE]; if (ct->ct_Ticks != ticks) { ct->ct_Ticks = ticks; ct->ct_Count = 0; } ++ct->ct_Count; } for (i = 0; i < CHTSIZE; ++i) { CTime *ct = &chBest->ch_Times[i]; if (ct->ct_Ticks <= ticks && ct->ct_Ticks >= ticks - CHTSIZE) { cnt += ct->ct_Count; } } if (cnt * (CHTSIZE * CHTGRAN) / 60 > sep->se_maxcpm) { r = -1; syslog(LOG_ERR, "%s from %s exceeded counts/min (limit %d/min)", sep->se_service, inet_ntoa(rsin.sin_addr), sep->se_maxcpm); } } return(r); }