/* $OpenBSD: inetd.c,v 1.46 1998/03/12 00:19:16 deraadt Exp $ */ /* $NetBSD: inetd.c,v 1.11 1996/02/22 11:14:41 mycroft Exp $ */ /* * Copyright (c) 1983,1991 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 char copyright[] = "@(#) Copyright (c) 1983 Regents of the University of California.\n\ All rights reserved.\n"; #endif /* not lint */ #ifndef lint /*static char sccsid[] = "from: @(#)inetd.c 5.30 (Berkeley) 6/3/91";*/ static char rcsid[] = "$OpenBSD: inetd.c,v 1.46 1998/03/12 00:19:16 deraadt 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 * 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. * * 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: setgid(primary group as found in passwd) * initgroups(name, primary group) * setuid() * * 2) set-group-option on. * * a) user = root: setgid(specified group) * NO initgroups() * NO setuid() * * b) other: setgid(specified group) * initgroups(name, specified group) * setuid() * */ #include #include #include #include #include #include #include #include #include #ifndef RLIMIT_NOFILE #define RLIMIT_NOFILE RLIMIT_OFILE #endif #include #include #include #include #include #include #include #include #include #include #include #include #include #include #include "pathnames.h" #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 SIGBLOCK (sigmask(SIGCHLD)|sigmask(SIGHUP)|sigmask(SIGALRM)) extern int errno; void config __P((int)); void reapchild __P((int)); void retry __P((int)); void goaway __P((int)); int debug = 0; int nsock, maxsock; fd_set allsock; int toomany = TOOMANY; int options; int timingout; struct servent *sp; char *curdom; uid_t uid; #ifndef OPEN_MAX #define OPEN_MAX 64 #endif /* Reserve some descriptors, 3 stdio + at least: 1 log, 1 conf. file */ #define FD_MARGIN (8) typeof(((struct rlimit *)0)->rlim_cur) 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) short se_wait; /* single threaded server */ 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 */ 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; void echo_stream __P((int, struct servtab *)); void discard_stream __P((int, struct servtab *)); void machtime_stream __P((int, struct servtab *)); void daytime_stream __P((int, struct servtab *)); void chargen_stream __P((int, struct servtab *)); void echo_dg __P((int, struct servtab *)); void discard_dg __P((int, struct servtab *)); void machtime_dg __P((int, struct servtab *)); void daytime_dg __P((int, struct servtab *)); void chargen_dg __P((int, struct servtab *)); 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 *)); } 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 1900 */ { "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 }, { 0 } }; #define NUMINT (sizeof(intab) / sizeof(struct inent)) char *CONFIG = _PATH_INETDCONF; char **Argv; char *LastArg; char *progname; void logpid __P((void)); int main(argc, argv, envp) int argc; char *argv[], *envp[]; { extern char *optarg; extern int optind; register struct servtab *sep; register struct passwd *pwd; register struct group *grp = NULL; register int tmpint; struct sigaction sa, sapipe; int ch, dofork; pid_t pid; char buf[50]; Argv = argv; if (envp == 0 || *envp == 0) envp = argv; while (*envp) envp++; LastArg = envp[-1] + strlen(envp[-1]); progname = strrchr(argv[0], '/'); progname = progname ? progname + 1 : argv[0]; while ((ch = getopt(argc, argv, "dR:")) != -1) switch(ch) { case 'd': debug = 1; options |= SO_DEBUG; break; case '?': case 'R': { /* invocation rate */ char *p; int val; val = strtoul(optarg, &p, 0); if (val >= 1 && p == NULL) { toomany = val; break; } syslog(LOG_ERR, "-R %s: bad value for service invocation rate", optarg); break; } default: fprintf(stderr, "usage: %s [-R rate] [-d] [conf]", progname); exit(1); } argc -= optind; argv += optind; uid = getuid(); if (uid != 0) CONFIG = NULL; if (argc > 0) CONFIG = argv[0]; if (CONFIG == NULL) { fprintf(stderr, "%s: non-root must specify a config file\n", progname); exit(1); } if (debug == 0) { daemon(0, 0); if (uid == 0) (void) setlogin(""); } if (uid == 0) { gid_t gid = getgid(); /* If run by hand, ensure groups vector gets trashed */ setgroups(1, &gid); } 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((char *)&sa, 0, sizeof(sa)); sa.sa_mask = SIGBLOCK; sa.sa_handler = retry; sigaction(SIGALRM, &sa, NULL); config(0); sa.sa_handler = config; sigaction(SIGHUP, &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); 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); } for (;;) { int n, ctrl; fd_set readable; if (nsock == 0) { (void) sigblock(SIGBLOCK); while (nsock == 0) sigpause(0L); (void) sigsetmask(0L); } readable = allsock; if ((n = select(maxsock + 1, &readable, NULL, NULL, NULL)) <= 0) { if (n < 0 && errno != EINTR) { syslog(LOG_WARNING, "select: %m"); sleep(1); } continue; } for (sep = servtab; n && sep; sep = 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) { ctrl = accept(sep->se_fd, NULL, NULL); if (debug) fprintf(stderr, "accept, ctrl %d\n", ctrl); if (ctrl < 0) { if (errno == EINTR) continue; syslog(LOG_WARNING, "accept (for %s): %m", sep->se_service); continue; } if (sep->se_family == AF_INET && sep->se_socktype == SOCK_STREAM) { struct sockaddr_in peer; int plen = sizeof(peer); if (getpeername(ctrl, (struct sockaddr *)&peer, &plen) < 0) { syslog(LOG_WARNING, "could not getpeername"); close(ctrl); continue; } if (ntohs(peer.sin_port) == 20) { /* XXX ftp bounce */ close(ctrl); continue; } } } else ctrl = sep->se_fd; (void) sigblock(SIGBLOCK); pid = 0; dofork = (sep->se_bi == 0 || sep->se_bi->bi_fork); if (dofork) { if (sep->se_count++ == 0) (void)gettimeofday(&sep->se_time, NULL); else if (sep->se_count >= sep->se_max) { struct timeval now; (void)gettimeofday(&now, NULL); if (now.tv_sec - sep->se_time.tv_sec > CNT_INTVL) { sep->se_time = now; sep->se_count = 1; } else { if (!sep->se_wait && sep->se_socktype == SOCK_STREAM) close(ctrl); if (sep->se_family == AF_INET && ntohs(sep->se_ctrladdr_in.sin_port) >= IPPORT_RESERVED) { /* * Cannot close it -- there are * thieves on the system. * Simply ignore the connection. */ --sep->se_count; continue; } syslog(LOG_ERR, "%s/%s server failing (looping), service terminated", sep->se_service, sep->se_proto); FD_CLR(sep->se_fd, &allsock); (void) close(sep->se_fd); sep->se_fd = -1; sep->se_count = 0; nsock--; sigsetmask(0L); 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); sigsetmask(0L); sleep(1); continue; } if (pid && sep->se_wait) { sep->se_wait = pid; FD_CLR(sep->se_fd, &allsock); nsock--; } sigsetmask(0L); if (pid == 0) { if (sep->se_bi) (*sep->se_bi->bi_fn)(ctrl, sep); else { if ((pwd = getpwnam(sep->se_user)) == NULL) { syslog(LOG_ERR, "getpwnam: %s: No such user", sep->se_user); if (sep->se_socktype != SOCK_STREAM) recv(0, buf, sizeof (buf), 0); _exit(1); } if (setsid() <0) syslog(LOG_ERR, "%s: setsid: %m", sep->se_service); if (sep->se_group && (grp = getgrnam(sep->se_group)) == NULL) { syslog(LOG_ERR, "getgrnam: %s: No such group", sep->se_group); if (sep->se_socktype != SOCK_STREAM) recv(0, buf, sizeof (buf), 0); _exit(1); } if (uid != 0) { /* a user running private inetd */ if (uid != pwd->pw_uid) _exit(1); } else if (pwd->pw_uid) { if (setlogin(sep->se_user) < 0) syslog(LOG_ERR, "%s: setlogin: %m", sep->se_service); if (sep->se_group) pwd->pw_gid = grp->gr_gid; (void) setgid((gid_t)pwd->pw_gid); initgroups(pwd->pw_name, pwd->pw_gid); (void) setuid((uid_t)pwd->pw_uid); } else if (sep->se_group) { (void) setgid(grp->gr_gid); (void) setgroups(1, &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 dup2(ctrl, 0); close(ctrl); dup2(0, 1); dup2(0, 2); #ifdef RLIMIT_NOFILE if (rlim_ofile.rlim_cur != rlim_ofile_cur) { if (setrlimit(RLIMIT_NOFILE, &rlim_ofile) < 0) syslog(LOG_ERR,"setrlimit: %m"); } #endif closelog(); for (tmpint = rlim_ofile_cur-1; --tmpint > 2; ) (void)close(tmpint); sigaction(SIGPIPE, &sapipe, NULL); execv(sep->se_server, sep->se_argv); if (sep->se_socktype != SOCK_STREAM) recv(0, buf, sizeof (buf), 0); syslog(LOG_ERR, "execv %s: %m", sep->se_server); _exit(1); } } if (!sep->se_wait && sep->se_socktype == SOCK_STREAM) close(ctrl); } } } int dg_badinput(sin) struct sockaddr_in *sin; { if (ntohs(sin->sin_port) < IPPORT_RESERVED) return (1); if (sin->sin_addr.s_addr == htonl(INADDR_BROADCAST)) return (1); /* XXX compare against broadcast addresses in SIOCGIFCONF list? */ return (0); } void reapchild(sig) int sig; { pid_t pid; int save_errno = errno, status; register struct servtab *sep; for (;;) { pid = wait3(&status, WNOHANG, NULL); 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); } } errno = save_errno; } int setconfig __P((void)); void endconfig __P((void)); void register_rpc __P((struct servtab *)); void unregister_rpc __P((struct servtab *)); void freeconfig __P((struct servtab *)); void print_service __P((char *, struct servtab *)); void setup __P((struct servtab *)); struct servtab *getconfigent __P((void)); struct servtab *enter __P((struct servtab *)); int matchconf __P((struct servtab *, struct servtab *)); void config(sig) int sig; { register struct servtab *sep, *cp, **sepp; int omask; int n; if (!setconfig()) { syslog(LOG_ERR, "%s: %m", CONFIG); return; } for (sep = servtab; sep; sep = sep->se_next) sep->se_checked = 0; cp = getconfigent(); while (cp != NULL) { for (sep = servtab; sep; sep = sep->se_next) if (matchconf(sep, cp)) break; if (sep != 0) { int i; #define SWAP(type, a, b) {type c=(type)a; (type)a=(type)b; (type)b=(type)c;} omask = sigblock(SIGBLOCK); /* * 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(int, cp->se_max, sep->se_max); 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]); #undef SWAP if (isrpcservice(sep)) unregister_rpc(sep); sep->se_rpcversl = cp->se_rpcversl; sep->se_rpcversh = cp->se_rpcversh; sigsetmask(omask); 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; (void)unlink(sep->se_service); n = strlen(sep->se_service); if (n > sizeof sep->se_ctrladdr_un.sun_path - 1) n = sizeof sep->se_ctrladdr_un.sun_path - 1; strncpy(sep->se_ctrladdr_un.sun_path, sep->se_service, n); sep->se_ctrladdr_un.sun_path[n] = '\0'; sep->se_ctrladdr_un.sun_family = AF_UNIX; sep->se_ctrladdr_size = n + sizeof sep->se_ctrladdr_un.sun_family; setup(sep); break; case AF_INET: sep->se_ctrladdr_in.sin_family = AF_INET; /* se_ctrladdr_in was set in getconfigent */ 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: unknown rpc service", sep->se_service); goto serv_unknown; } sep->se_rpcprog = rp->r_number; } if (sep->se_fd == -1) 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); goto serv_unknown; } port = sp->s_port; } if (port != sep->se_ctrladdr_in.sin_port) { sep->se_ctrladdr_in.sin_port = port; if (sep->se_fd != -1) { FD_CLR(sep->se_fd, &allsock); nsock--; (void) close(sep->se_fd); } sep->se_fd = -1; } if (sep->se_fd == -1) setup(sep); } } serv_unknown: if (cp->se_next != NULL) { struct servtab *tmp = cp; cp = cp->se_next; free(tmp); } else { free (cp); cp = getconfigent(); } } 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 != -1) { FD_CLR(sep->se_fd, &allsock); nsock--; (void) close(sep->se_fd); } 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); } (void) sigsetmask(omask); } void retry(sig) int sig; { register struct servtab *sep; timingout = 0; for (sep = servtab; sep; sep = sep->se_next) { if (sep->se_fd == -1) { 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(sig) int sig; { register 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); } int bump_nofile __P((void)); void setup(sep) register struct servtab *sep; { int on = 1; int r; if ((sep->se_fd = socket(sep->se_family, sep->se_socktype, 0)) < 0) { 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"); #undef turnon if (isrpcservice(sep)) { struct passwd *pwd; /* * for RPC services, attempt to use a reserved port * if they are going to be running as root. * * Also, zero out the port for all RPC services; let bind() * find one. */ sep->se_ctrladdr_in.sin_port = 0; if (sep->se_user && (pwd = getpwnam(sep->se_user)) && pwd->pw_uid == 0 && uid == 0) r = bindresvport(sep->se_fd, &sep->se_ctrladdr_in); else { r = bind(sep->se_fd, &sep->se_ctrladdr, sep->se_ctrladdr_size); if (r == 0) { int len = sep->se_ctrladdr_size; int saveerrno = errno; /* update se_ctrladdr_in.sin_port */ r = getsockname(sep->se_fd, &sep->se_ctrladdr, &len); if (r <= 0) errno = saveerrno; } } } else r = bind(sep->se_fd, &sep->se_ctrladdr, sep->se_ctrladdr_size); if (r < 0) { 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(); } } void register_rpc(sep) register struct servtab *sep; { 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, "%s %s: pmap_set: %u %u %u %u: %m", sep->se_service, sep->se_proto, sep->se_rpcprog, n, pp->p_proto, ntohs(sin.sin_port)); } } void unregister_rpc(sep) register struct servtab *sep; { 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)", sep->se_rpcprog, n); } } struct servtab * enter(cp) struct servtab *cp; { register struct servtab *sep; int omask; sep = (struct servtab *)malloc(sizeof (*sep)); if (sep == NULL) { syslog(LOG_ERR, "Out of memory."); exit(-1); } *sep = *cp; sep->se_fd = -1; sep->se_rpcprog = -1; omask = sigblock(SIGBLOCK); sep->se_next = servtab; servtab = sep; sigsetmask(omask); return (sep); } int matchconf (old, new) struct servtab *old; struct servtab *new; { if (strcmp(old->se_service, new->se_service) != 0) return (0); if (strcmp(old->se_hostaddr, new->se_hostaddr) != 0) return (0); if (strcmp(old->se_proto, new->se_proto) != 0) return (0); /* * If the new servtab is bound to a specific address, check that the * old servtab is bound to the same entry. If the new service is not * bound to a specific address then the check of se_hostaddr above * is sufficient. */ if ((old->se_family == AF_INET) && (new->se_family == AF_INET) && (bcmp(&old->se_ctrladdr_in.sin_addr, &new->se_ctrladdr_in.sin_addr, sizeof(new->se_ctrladdr_in.sin_addr)) != 0)) { return (0); } return (1); } FILE *fconfig = NULL; char line[1024]; char *defhost; char *skip __P((char **)); char *nextline __P((FILE *)); char *newstr __P((char *)); struct servtab *dupconfig __P((struct servtab *)); int setconfig() { if (defhost) free(defhost); defhost = newstr("*"); if (fconfig != NULL) { fseek(fconfig, 0L, L_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() { register struct servtab *sep; int argc; char *cp, *arg; char *hostdelim; struct servtab *nsep; struct servtab *psep; sep = (struct servtab *) malloc(sizeof(struct servtab)); if (sep == NULL) { syslog(LOG_ERR, "malloc: %m"); exit(-1); } more: #ifdef MULOG while ((cp = nextline(fconfig)) && *cp == '#') { /* 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 == '#') ; #endif if (cp == NULL) return (NULL); memset((char *)sep, 0, sizeof *sep); arg = skip(&cp); if (arg == NULL) { /* A blank line. */ 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); sep->se_service = newstr(arg); arg = skip(&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(skip(&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) { 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; } } } arg = skip(&cp); if (arg == NULL) goto more; { char *s = strchr(arg, '.'); if (s) { *s++ = '\0'; sep->se_max = atoi(s); } else sep->se_max = toomany; } sep->se_wait = strcmp(arg, "wait") == 0; sep->se_user = newstr(skip(&cp)); arg = strchr(sep->se_user, '.'); if (arg) { *arg++ = '\0'; sep->se_group = newstr(arg); } sep->se_server = newstr(skip(&cp)); if (strcmp(sep->se_server, "internal") == 0) { register 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; /* * Now that we've processed the entire line, check if the hostname * specifier was a comma separated list of hostnames. If so * we'll make new entries for each address. */ while ((hostdelim = strrchr(sep->se_hostaddr, ',')) != NULL) { nsep = dupconfig(sep); /* * NULL terminate the hostname field of the existing entry, * and make a dup for the new entry. */ *hostdelim++ = '\0'; nsep->se_hostaddr = newstr(hostdelim); nsep->se_next = sep->se_next; sep->se_next = nsep; } nsep = sep; while (nsep != NULL) { nsep->se_checked = 1; if (nsep->se_family == AF_INET) { if (!strcmp(nsep->se_hostaddr,"*")) nsep->se_ctrladdr_in.sin_addr.s_addr = INADDR_ANY; else if (!inet_aton(nsep->se_hostaddr, &nsep->se_ctrladdr_in.sin_addr)) { struct hostent *hp; hp = gethostbyname(nsep->se_hostaddr); if (hp == 0) { syslog(LOG_ERR, "%s: unknown host", nsep->se_hostaddr); nsep->se_checked = 0; goto skip; } else if (hp->h_addrtype != AF_INET) { syslog(LOG_ERR, "%s: address isn't an Internet " "address", nsep->se_hostaddr); nsep->se_checked = 0; goto skip; } else { int i = 1; memmove(&nsep->se_ctrladdr_in.sin_addr, hp->h_addr_list[0], sizeof(struct in_addr)); while (hp->h_addr_list[i] != NULL) { psep = dupconfig(nsep); psep->se_hostaddr = newstr( nsep->se_hostaddr); psep->se_checked = 1; memmove(&psep->se_ctrladdr_in.sin_addr, hp->h_addr_list[i], sizeof(struct in_addr)); psep->se_ctrladdr_size = sizeof(psep->se_ctrladdr_in); i++; /* * Prepend to list, don't * want to look up its * hostname again. */ psep->se_next = sep; sep = psep; } } } } skip: nsep = nsep->se_next; } /* * Finally, free any entries which failed the gethostbyname * check. */ psep = NULL; nsep = sep; while (nsep != NULL) { struct servtab *tsep; if (nsep->se_checked == 0) { tsep = nsep; if (psep == NULL) { sep = nsep->se_next; nsep = sep; } else { nsep = nsep->se_next; psep->se_next = nsep; } freeconfig(tsep); } else { nsep->se_checked = 0; psep = nsep; nsep = nsep->se_next; } } return (sep); } void freeconfig(cp) register 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); if (cp->se_group) free(cp->se_group); if (cp->se_server) free(cp->se_server); for (i = 0; i < MAXARGV; i++) if (cp->se_argv[i]) free(cp->se_argv[i]); } char * skip(cpp) char **cpp; { register char *cp = *cpp; char *start; if (*cpp == NULL) return (NULL); 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 = NULL; return (NULL); } 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 (NULL); 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); } struct servtab * dupconfig(sep) struct servtab *sep; { struct servtab *newtab; int argc; newtab = (struct servtab *) malloc(sizeof(struct servtab)); if (newtab == NULL) { syslog(LOG_ERR, "malloc: %m"); exit (-1); } memset((char *)newtab, 0, sizeof(struct servtab)); newtab->se_service = sep->se_service ? newstr(sep->se_service) : NULL; newtab->se_socktype = sep->se_socktype; newtab->se_family = sep->se_family; newtab->se_proto = sep->se_proto ? newstr(sep->se_proto) : NULL; newtab->se_rpcprog = sep->se_rpcprog; newtab->se_rpcversl = sep->se_rpcversl; newtab->se_rpcversh = sep->se_rpcversh; newtab->se_wait = sep->se_wait; newtab->se_user = sep->se_user ? newstr(sep->se_user) : NULL; newtab->se_group = sep->se_group ? newstr(sep->se_group) : NULL; newtab->se_bi = sep->se_bi; newtab->se_server = sep->se_server ? newstr(sep->se_server) : 0; for (argc = 0; argc <= MAXARGV; argc++) newtab->se_argv[argc] = sep->se_argv[argc] ? newstr(sep->se_argv[argc]) : NULL; newtab->se_max = sep->se_max; #ifdef MULOG newtab->se_log = sep->se_log; #endif return (newtab); } void inetd_setproctitle(a, s) char *a; int s; { int size; register char *cp; struct sockaddr_in sin; char buf[80]; cp = Argv[0]; size = sizeof(sin); (void) snprintf(buf, sizeof buf, "-%s", a); if (getpeername(s, (struct sockaddr *)&sin, &size) == 0) { char *s = inet_ntoa(sin.sin_addr); buf[sizeof(buf) - 1 - strlen(s) - 3] = '\0'; strcat(buf, " ["); strcat(buf, s); strcat(buf, "]"); } 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); } } int bump_nofile() { #ifdef RLIMIT_NOFILE #define FD_CHUNK 32 struct rlimit rl; if (getrlimit(RLIMIT_NOFILE, &rl) < 0) { syslog(LOG_ERR, "getrlimit: %m"); return -1; } rl.rlim_cur = MIN(rl.rlim_max, rl.rlim_cur + FD_CHUNK); rl.rlim_cur = MIN(FD_SETSIZE, 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 -1; } if (setrlimit(RLIMIT_NOFILE, &rl) < 0) { syslog(LOG_ERR, "setrlimit: %m"); return -1; } rlim_ofile_cur = rl.rlim_cur; return 0; #else syslog(LOG_ERR, "bump_nofile: cannot extend file limit"); return -1; #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) ; exit(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; if (dg_badinput((struct sockaddr_in *)&sa)) 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) ; exit(0); } /* 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() { register 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; { register char *rs; int len; char 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; } exit(0); } /* 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 (dg_badinput((struct sockaddr_in *)&sa)) 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. */ u_int machtime() { struct timeval tv; if (gettimeofday(&tv, NULL) < 0) { fprintf(stderr, "Unable to get time of day\n"); return (0L); } return (htonl((u_int)tv.tv_sec + 2208988800UL)); } /* ARGSUSED */ void machtime_stream(s, sep) int s; struct servtab *sep; { u_int result; result = machtime(); (void) write(s, (char *) &result, sizeof(result)); } /* ARGSUSED */ void machtime_dg(s, sep) int s; struct servtab *sep; { u_int result; struct sockaddr sa; struct sockaddr_in *sin; int size; size = sizeof(sa); if (recvfrom(s, (char *)&result, sizeof(result), 0, &sa, &size) < 0) return; sin = (struct sockaddr_in *)&sa; if (sin->sin_addr.s_addr == htonl(INADDR_BROADCAST) || ntohs(sin->sin_port) < IPPORT_RESERVED/2) 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 time(), clock; clock = time(NULL); (void) sprintf(buffer, "%.24s\r\n", ctime(&clock)); (void) write(s, buffer, strlen(buffer)); } /* ARGSUSED */ void daytime_dg(s, sep) /* Return human-readable time of day */ int s; struct servtab *sep; { char buffer[256]; time_t time(), clock; struct sockaddr sa; int size; clock = time((time_t *) 0); size = sizeof(sa); if (recvfrom(s, buffer, sizeof(buffer), 0, &sa, &size) < 0) return; if (dg_badinput((struct sockaddr_in *)&sa)) return; (void) sprintf(buffer, "%.24s\r\n", ctime(&clock)); (void) sendto(s, buffer, strlen(buffer), 0, &sa, sizeof(sa)); } /* * print_service: * Dump relevant information to stderr */ void print_service(action, sep) char *action; struct servtab *sep; { if (strcmp(sep->se_hostaddr, "*") == 0) fprintf(stderr, "%s: %s ", action, sep->se_service); else fprintf(stderr, "%s: %s:%s ", action, sep->se_hostaddr, sep->se_service); if (isrpcservice(sep)) fprintf(stderr, "rpcprog=%d, rpcvers=%d/%d, proto=%s,", sep->se_rpcprog, sep->se_rpcversh, sep->se_rpcversl, sep->se_proto); else fprintf(stderr, "proto=%s,", sep->se_proto); fprintf(stderr, " wait.max=%hd.%d user.group=%s.%s builtin=%lx server=%s\n", sep->se_wait, sep->se_max, sep->se_user, sep->se_group, (long)sep->se_bi, sep->se_server); } #ifdef MULOG char *rfc931_name __P((struct sockaddr_in *, int)); 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]; 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 jmp_buf timebuf; /* timeout - handle timeouts */ static void timeout(sig) int sig; { longjmp(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; /* 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); } signal(SIGALRM, timeout); if (setjmp(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? */ 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