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NetBSD/usr.sbin/inetd/inetd.c

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/* $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 1.10 1995/06/02 15:02:18 pk 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
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