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-rw-r--r--usr.sbin/inetd/inetd.c1607
1 files changed, 1607 insertions, 0 deletions
diff --git a/usr.sbin/inetd/inetd.c b/usr.sbin/inetd/inetd.c
new file mode 100644
index 00000000000..02c194145fe
--- /dev/null
+++ b/usr.sbin/inetd/inetd.c
@@ -0,0 +1,1607 @@
+/* $NetBSD: inetd.c,v 1.10 1995/06/02 15:02:18 pk 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[] = "$Id: inetd.c,v 1.1 1995/10/18 08:47:36 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)
+ *
+ * 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 <sys/param.h>
+#include <sys/stat.h>
+#include <sys/ioctl.h>
+#include <sys/socket.h>
+#include <sys/un.h>
+#include <sys/file.h>
+#include <sys/wait.h>
+#include <sys/time.h>
+#include <sys/resource.h>
+
+#ifndef RLIMIT_NOFILE
+#define RLIMIT_NOFILE RLIMIT_OFILE
+#endif
+
+#define RPC
+
+#include <netinet/in.h>
+#include <arpa/inet.h>
+
+#include <errno.h>
+#include <signal.h>
+#include <netdb.h>
+#include <syslog.h>
+#include <pwd.h>
+#include <grp.h>
+#include <stdio.h>
+#include <stdlib.h>
+#include <string.h>
+#ifdef RPC
+#include <rpc/rpc.h>
+#endif
+#include "pathnames.h"
+
+#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 */
+
+#define SIGBLOCK (sigmask(SIGCHLD)|sigmask(SIGHUP)|sigmask(SIGALRM))
+
+extern int errno;
+
+void config(), reapchild(), retry(), goaway();
+char *index();
+
+int debug = 0;
+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)
+typeof(((struct rlimit *)0)->rlim_cur) rlim_ofile_cur = OPEN_MAX;
+
+#ifdef RLIMIT_NOFILE
+struct rlimit rlim_ofile;
+#endif
+
+struct servtab {
+ 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;
+
+int echo_stream(), discard_stream(), machtime_stream();
+int daytime_stream(), chargen_stream();
+int echo_dg(), discard_dg(), machtime_dg(), daytime_dg(), chargen_dg();
+
+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 */
+ int (*bi_fn)(); /* 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 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;
+
+#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
+
+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;
+ register int tmpint;
+ struct sigvec sv;
+ int ch, pid, dofork;
+ 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, "d")) != EOF)
+ switch(ch) {
+ case 'd':
+ debug = 1;
+ options |= SO_DEBUG;
+ break;
+ case '?':
+ default:
+ fprintf(stderr, "usage: %s [-d] [conf]", progname);
+ exit(1);
+ }
+ argc -= optind;
+ argv += optind;
+
+ if (argc > 0)
+ CONFIG = argv[0];
+
+ if (debug == 0)
+ daemon(0, 0);
+ 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
+
+ bzero((char *)&sv, sizeof(sv));
+ sv.sv_mask = SIGBLOCK;
+ sv.sv_handler = retry;
+ sigvec(SIGALRM, &sv, (struct sigvec *)0);
+ config();
+ sv.sv_handler = config;
+ sigvec(SIGHUP, &sv, (struct sigvec *)0);
+ sv.sv_handler = reapchild;
+ sigvec(SIGCHLD, &sv, (struct sigvec *)0);
+ sv.sv_handler = goaway;
+ sigvec(SIGTERM, &sv, (struct sigvec *)0);
+ sv.sv_handler = goaway;
+ sigvec(SIGINT, &sv, (struct sigvec *)0);
+
+ {
+ /* 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, (fd_set *)0,
+ (fd_set *)0, (struct timeval *)0)) <= 0) {
+ if (n < 0 && errno != EINTR)
+ syslog(LOG_WARNING, "select: %m\n");
+ 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, (struct sockaddr *)0,
+ (int *)0);
+ 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;
+ }
+ } 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,
+ (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);
+ 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_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 (debug && dofork)
+ setsid();
+ 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 (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 (pwd->pw_uid) {
+ 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((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
+ 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
+ for (tmpint = rlim_ofile_cur-1; --tmpint > 2; )
+ (void)close(tmpint);
+ 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);
+ }
+ }
+}
+
+void
+reapchild()
+{
+ int status;
+ int pid;
+ register struct servtab *sep;
+
+ for (;;) {
+ pid = wait3(&status, WNOHANG, (struct rusage *)0);
+ if (pid <= 0)
+ break;
+ if (debug)
+ fprintf(stderr, "%d reaped\n", pid);
+ 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()
+{
+ register struct servtab *sep, *cp, **sepp;
+ struct servtab *getconfigent(), *enter();
+ long 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_proto, cp->se_proto) == 0)
+ 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;
+ if (cp->se_max != sep->se_max)
+ SWAP(int, cp->se_max, sep->se_max);
+ if (cp->se_user)
+ SWAP(char *, sep->se_user, cp->se_user);
+ if (cp->se_group)
+ SWAP(char *, sep->se_group, cp->se_group);
+ if (cp->se_server)
+ 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_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;
+ 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 service",
+ sep->se_service);
+ continue;
+ }
+ 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);
+ continue;
+ }
+ 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);
+ }
+ }
+ }
+ 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()
+{
+ 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()
+{
+ 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);
+}
+
+
+setup(sep)
+ register struct servtab *sep;
+{
+ int on = 1;
+
+ 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 (bind(sep->se_fd, &sep->se_ctrladdr, sep->se_ctrladdr_size) < 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();
+ }
+}
+
+register_rpc(sep)
+ register 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 */
+}
+
+unregister_rpc(sep)
+ register 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;
+{
+ register struct servtab *sep;
+ long 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;
+ omask = sigblock(SIGBLOCK);
+ sep->se_next = servtab;
+ servtab = sep;
+ sigsetmask(omask);
+ return (sep);
+}
+
+FILE *fconfig = NULL;
+struct servtab serv;
+char line[256];
+char *skip(), *nextline();
+
+setconfig()
+{
+
+ if (fconfig != NULL) {
+ fseek(fconfig, 0L, L_SET);
+ return (1);
+ }
+ fconfig = fopen(CONFIG, "r");
+ return (fconfig != NULL);
+}
+
+endconfig()
+{
+ if (fconfig) {
+ (void) fclose(fconfig);
+ fconfig = NULL;
+ }
+}
+
+struct servtab *
+getconfigent()
+{
+ register struct servtab *sep = &serv;
+ int argc;
+ char *cp, *arg, *newstr();
+
+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 ((struct servtab *)0);
+ bzero((char *)sep, sizeof *sep);
+ sep->se_service = newstr(skip(&cp));
+ arg = skip(&cp);
+ if (arg == NULL)
+ goto more;
+
+ 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) {
+#ifdef RPC
+ char *cp, *ccp;
+ cp = index(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 = skip(&cp);
+ if (arg == NULL)
+ goto more;
+ {
+ char *s = index(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));
+ if (sep->se_group = index(sep->se_user, '.')) {
+ *sep->se_group++ = '\0';
+ }
+ 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\n",
+ 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, *rindex();
+
+ if (argc == 0 && (colon = rindex(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);
+}
+
+freeconfig(cp)
+ register 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);
+ /* 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]);
+}
+
+char *
+skip(cpp)
+ char **cpp;
+{
+ register 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 = index(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);
+}
+
+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);
+ 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++ = ' ';
+}
+
+logpid()
+{
+ FILE *fp;
+
+ if ((fp = fopen(_PATH_INETDPID, "w")) != NULL) {
+ fprintf(fp, "%u\n", getpid());
+ (void)fclose(fp);
+ }
+}
+
+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);
+ if (rl.rlim_cur <= rlim_ofile_cur) {
+ syslog(LOG_ERR,
+ "bump_nofile: cannot extend file limit, max = %d",
+ 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 */
+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 */
+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 */
+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 */
+discard_dg(s, sep) /* Discard service -- ignore data */
+ int s;
+ struct servtab *sep;
+{
+ char buffer[BUFSIZE];
+
+ (void) read(s, buffer, sizeof(buffer));
+}
+
+#include <ctype.h>
+#define LINESIZ 72
+char ring[128];
+char *endring;
+
+initring()
+{
+ register int i;
+
+ endring = ring;
+
+ for (i = 0; i <= 128; ++i)
+ if (isprint(i))
+ *endring++ = i;
+}
+
+/* ARGSUSED */
+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)
+ bcopy(rs, text, LINESIZ);
+ else {
+ bcopy(rs, text, len);
+ bcopy(ring, text + len, LINESIZ - len);
+ }
+ if (++rs == endring)
+ rs = ring;
+ if (write(s, text, sizeof(text)) != sizeof(text))
+ break;
+ }
+ exit(0);
+}
+
+/* ARGSUSED */
+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)
+ bcopy(rs, text, LINESIZ);
+ else {
+ bcopy(rs, text, len);
+ bcopy(ring, text + len, 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) {
+ fprintf(stderr, "Unable to get time of day\n");
+ return (0L);
+ }
+ return (htonl((long)tv.tv_sec + 2208988800UL));
+}
+
+/* ARGSUSED */
+machtime_stream(s, sep)
+ int s;
+ struct servtab *sep;
+{
+ long result;
+
+ result = machtime();
+ (void) write(s, (char *) &result, sizeof(result));
+}
+
+/* ARGSUSED */
+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 */
+daytime_stream(s, sep) /* Return human-readable time of day */
+ int s;
+ struct servtab *sep;
+{
+ char buffer[256];
+ time_t time(), clock;
+
+ clock = time((time_t *) 0);
+
+ (void) sprintf(buffer, "%.24s\r\n", ctime(&clock));
+ (void) write(s, buffer, strlen(buffer));
+}
+
+/* ARGSUSED */
+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;
+ (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
+ */
+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, 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_user, sep->se_group,
+ (long)sep->se_bi, sep->se_server);
+ else
+ fprintf(stderr,
+ "%s: %s proto=%s, wait.max=%d.%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_user, sep->se_group,
+ (long)sep->se_bi, sep->se_server);
+}
+
+#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 <setjmp.h>
+
+#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
generated by cgit v1.2.3 (git 2.25.1) at 2025-01-19 10:38:26 +0000