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busybox/networking/inetd.c
Rob Landley d921b2ecc0 Remove bb_ prefixes from xfuncs.c (and a few other places), consolidate 
things like xasprintf() into xfuncs.c, remove xprint_file_by_name() (it only
had one user), clean up lots of #includes...  General cleanup pass.  What I've
been doing for the last couple days.

And it conflicts!  I've removed httpd.c from this checkin due to somebody else
touching that file.  It builds for me.  I have to catch a bus.  (Now you know
why I'm looking forward to Mercurial.)
2006-08-03 15:41:12 +00:00

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/* vi: set sw=4 ts=4: */
/* $Slackware: inetd.c 1.79s 2001/02/06 13:18:00 volkerdi Exp $ */
/* $OpenBSD: inetd.c,v 1.79 2001/01/30 08:30:57 deraadt Exp $ */
/* $NetBSD: inetd.c,v 1.11 1996/02/22 11:14:41 mycroft Exp $ */
/* Busybox port by Vladimir Oleynik (C) 2001-2005 <dzo@simtreas.ru> */
/*
* 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.
*/
/*
* 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 begin 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] or 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] or 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 "busybox.h"
#include <syslog.h>
//#define CONFIG_FEATURE_INETD_RPC
//#define CONFIG_FEATURE_INETD_SUPPORT_BUILTIN_ECHO
//#define CONFIG_FEATURE_INETD_SUPPORT_BUILTIN_DISCARD
//#define CONFIG_FEATURE_INETD_SUPPORT_BUILTIN_TIME
//#define CONFIG_FEATURE_INETD_SUPPORT_BUILTIN_DAYTIME
//#define CONFIG_FEATURE_INETD_SUPPORT_BUILTIN_CHARGEN
//#define CONFIG_FEATURE_IPV6
#ifdef CONFIG_FEATURE_INETD_RPC
#include <rpc/rpc.h>
#include <rpc/pmap_clnt.h>
#endif
#define _PATH_INETDCONF "/etc/inetd.conf"
#define _PATH_INETDPID "/var/run/inetd.pid"
#define TOOMANY 0 /* 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 */
#ifndef RLIMIT_NOFILE
#define RLIMIT_NOFILE RLIMIT_OFILE
#endif
#ifndef OPEN_MAX
#define OPEN_MAX 64
#endif
/* Reserve some descriptors, 3 stdio + at least: 1 log, 1 conf. file */
#define FD_MARGIN (8)
static rlim_t rlim_ofile_cur = OPEN_MAX;
static struct rlimit rlim_ofile;
/* Check unsupporting builtin */
#if defined CONFIG_FEATURE_INETD_SUPPORT_BUILTIN_ECHO || \
defined CONFIG_FEATURE_INETD_SUPPORT_BUILTIN_DISCARD || \
defined CONFIG_FEATURE_INETD_SUPPORT_BUILTIN_TIME || \
defined CONFIG_FEATURE_INETD_SUPPORT_BUILTIN_DAYTIME || \
defined CONFIG_FEATURE_INETD_SUPPORT_BUILTIN_CHARGEN
# define INETD_FEATURE_ENABLED
#endif
#if defined CONFIG_FEATURE_INETD_SUPPORT_BUILTIN_ECHO || \
defined CONFIG_FEATURE_INETD_SUPPORT_BUILTIN_DISCARD || \
defined CONFIG_FEATURE_INETD_SUPPORT_BUILTIN_CHARGEN
# define INETD_SETPROCTITLE
#endif
typedef 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 */
#ifdef CONFIG_FEATURE_INETD_RPC
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)
#else
#define isrpcservice(sep) 0
#endif
pid_t 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 */
#ifdef INETD_FEATURE_ENABLED
const struct builtin *se_bi; /* if built-in, description */
#endif
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;
#ifdef CONFIG_FEATURE_IPV6
struct sockaddr_in6 se_un_ctrladdr_in6;
#endif
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_in6 se_un.se_un_ctrladdr_in6
#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 */
struct servtab *se_next;
} servtab_t;
static servtab_t *servtab;
#ifdef INETD_FEATURE_ENABLED
struct builtin
{
const 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) (int, servtab_t *);
};
/* Echo received data */
#ifdef CONFIG_FEATURE_INETD_SUPPORT_BUILTIN_ECHO
static void echo_stream (int, servtab_t *);
static void echo_dg (int, servtab_t *);
#endif
/* Internet /dev/null */
#ifdef CONFIG_FEATURE_INETD_SUPPORT_BUILTIN_DISCARD
static void discard_stream (int, servtab_t *);
static void discard_dg (int, servtab_t *);
#endif
/* Return 32 bit time since 1900 */
#ifdef CONFIG_FEATURE_INETD_SUPPORT_BUILTIN_TIME
static void machtime_stream (int, servtab_t *);
static void machtime_dg (int, servtab_t *);
#endif
/* Return human-readable time */
#ifdef CONFIG_FEATURE_INETD_SUPPORT_BUILTIN_DAYTIME
static void daytime_stream (int, servtab_t *);
static void daytime_dg (int, servtab_t *);
#endif
/* Familiar character generator */
#ifdef CONFIG_FEATURE_INETD_SUPPORT_BUILTIN_CHARGEN
static void chargen_stream (int, servtab_t *);
static void chargen_dg (int, servtab_t *);
#endif
static const struct builtin builtins[] = {
#ifdef CONFIG_FEATURE_INETD_SUPPORT_BUILTIN_ECHO
/* Echo received data */
{"echo", SOCK_STREAM, 1, 0, echo_stream,},
{"echo", SOCK_DGRAM, 0, 0, echo_dg,},
#endif
#ifdef CONFIG_FEATURE_INETD_SUPPORT_BUILTIN_DISCARD
/* Internet /dev/null */
{"discard", SOCK_STREAM, 1, 0, discard_stream,},
{"discard", SOCK_DGRAM, 0, 0, discard_dg,},
#endif
#ifdef CONFIG_FEATURE_INETD_SUPPORT_BUILTIN_TIME
/* Return 32 bit time since 1900 */
{"time", SOCK_STREAM, 0, 0, machtime_stream,},
{"time", SOCK_DGRAM, 0, 0, machtime_dg,},
#endif
#ifdef CONFIG_FEATURE_INETD_SUPPORT_BUILTIN_DAYTIME
/* Return human-readable time */
{"daytime", SOCK_STREAM, 0, 0, daytime_stream,},
{"daytime", SOCK_DGRAM, 0, 0, daytime_dg,},
#endif
#ifdef CONFIG_FEATURE_INETD_SUPPORT_BUILTIN_CHARGEN
/* Familiar character generator */
{"chargen", SOCK_STREAM, 1, 0, chargen_stream,},
{"chargen", SOCK_DGRAM, 0, 0, chargen_dg,},
#endif
{NULL, 0, 0, 0, NULL}
};
#endif /* INETD_FEATURE_ENABLED */
static int global_queuelen = 128;
static int nsock, maxsock;
static fd_set allsock;
static int toomany = TOOMANY;
static int timingout;
static struct servent *sp;
static uid_t uid;
static char *CONFIG = _PATH_INETDCONF;
static FILE *fconfig;
static char line[1024];
static char *defhost;
static char *newstr (char *cp)
{
if ((cp = strdup (cp ? cp : "")))
return (cp);
syslog (LOG_ERR, "strdup: %m");
exit (1);
}
static int setconfig (void)
{
free (defhost);
defhost = newstr ("*");
if (fconfig != NULL) {
fseek (fconfig, 0L, SEEK_SET);
return (1);
}
fconfig = fopen (CONFIG, "r");
return (fconfig != NULL);
}
static void endconfig (void)
{
if (fconfig) {
(void) fclose (fconfig);
fconfig = NULL;
}
free (defhost);
defhost = 0;
}
#ifdef CONFIG_FEATURE_INETD_RPC
static void register_rpc (servtab_t *sep)
{
int n;
struct sockaddr_in ir_sin;
struct protoent *pp;
socklen_t size;
if ((pp = getprotobyname (sep->se_proto + 4)) == NULL) {
syslog (LOG_ERR, "%s: getproto: %m", sep->se_proto);
return;
}
size = sizeof ir_sin;
if (getsockname (sep->se_fd, (struct sockaddr *) &ir_sin, &size) < 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++) {
(void) pmap_unset (sep->se_rpcprog, n);
if (!pmap_set (sep->se_rpcprog, n, pp->p_proto, ntohs (ir_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 (ir_sin.sin_port));
}
}
static void unregister_rpc (servtab_t *sep)
{
int n;
for (n = sep->se_rpcversl; n <= sep->se_rpcversh; n++) {
if (!pmap_unset (sep->se_rpcprog, n))
syslog (LOG_ERR, "pmap_unset(%u, %u)", sep->se_rpcprog, n);
}
}
#endif /* CONFIG_FEATURE_INETD_RPC */
static void freeconfig (servtab_t *cp)
{
int i;
free (cp->se_hostaddr);
free (cp->se_service);
free (cp->se_proto);
free (cp->se_user);
free (cp->se_group);
free (cp->se_server);
for (i = 0; i < MAXARGV; i++)
free (cp->se_argv[i]);
}
static int bump_nofile (void)
{
#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;
}
static void setup (servtab_t *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 (turnon (sep->se_fd, SO_REUSEADDR) < 0)
syslog (LOG_ERR, "setsockopt (SO_REUSEADDR): %m");
#undef turnon
#ifdef CONFIG_FEATURE_INETD_RPC
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) {
socklen_t 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
#endif
r = bind (sep->se_fd, &sep->se_ctrladdr, sep->se_ctrladdr_size);
if (r < 0) {
syslog (LOG_ERR, "%s/%s (%d): bind: %m",
sep->se_service, sep->se_proto, sep->se_ctrladdr.sa_family);
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, global_queuelen);
FD_SET (sep->se_fd, &allsock);
nsock++;
if (sep->se_fd > maxsock) {
maxsock = sep->se_fd;
if ((rlim_t)maxsock > rlim_ofile_cur - FD_MARGIN)
bump_nofile ();
}
}
static char *nextline (void)
{
char *cp;
FILE *fd = fconfig;
if (fgets (line, sizeof (line), fd) == NULL)
return (NULL);
cp = strchr (line, '\n');
if (cp)
*cp = '\0';
return (line);
}
static char *skip (char **cpp) /* int report; */
{
char *cp = *cpp;
char *start;
/* erp: */
if (*cpp == NULL) {
/* if (report) */
/* syslog(LOG_ERR, "syntax error in inetd config file"); */
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 ()))
goto again;
*cpp = NULL;
/* goto erp; */
return (NULL);
}
start = cp;
while (*cp && *cp != ' ' && *cp != '\t')
cp++;
if (*cp != '\0')
*cp++ = '\0';
/* if ((*cpp = cp) == NULL) */
/* goto erp; */
*cpp = cp;
return (start);
}
static servtab_t *new_servtab(void)
{
servtab_t *sep;
sep = (servtab_t *) malloc (sizeof (servtab_t));
if (sep == NULL) {
syslog (LOG_ERR, bb_msg_memory_exhausted);
exit (1);
}
return sep;
}
static servtab_t *dupconfig (servtab_t *sep)
{
servtab_t *newtab;
int argc;
newtab = new_servtab();
memset (newtab, 0, sizeof (servtab_t));
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;
#ifdef CONFIG_FEATURE_INETD_RPC
newtab->se_rpcprog = sep->se_rpcprog;
newtab->se_rpcversl = sep->se_rpcversl;
newtab->se_rpcversh = sep->se_rpcversh;
#endif
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;
#ifdef INETD_FEATURE_ENABLED
newtab->se_bi = sep->se_bi;
#endif
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;
return (newtab);
}
static servtab_t *getconfigent (void)
{
servtab_t *sep;
int argc;
char *cp, *arg;
char *hostdelim;
servtab_t *nsep;
servtab_t *psep;
sep = new_servtab();
/* memset(sep, 0, sizeof *sep); */
more:
/* freeconfig(sep); */
while ((cp = nextline ()) && *cp == '#');
if (cp == NULL) {
/* free(sep); */
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 (sep->se_proto[strlen (sep->se_proto) - 1] == '6')
#ifdef CONFIG_FEATURE_IPV6
sep->se_family = AF_INET6;
#else
syslog (LOG_ERR, "%s: IPV6 not supported", sep->se_proto);
#endif
if (strncmp (sep->se_proto, "rpc/", 4) == 0) {
#ifdef CONFIG_FEATURE_INETD_RPC
char *p, *ccp;
long l;
p = strchr (sep->se_service, '/');
if (p == 0) {
syslog (LOG_ERR, "%s: no rpc version", sep->se_service);
goto more;
}
*p++ = '\0';
l = strtol (p, &ccp, 0);
if (ccp == p || l < 0 || l > INT_MAX) {
badafterall:
syslog (LOG_ERR, "%s/%s: bad rpc version", sep->se_service, p);
goto more;
}
sep->se_rpcversl = sep->se_rpcversh = l;
if (*ccp == '-') {
p = ccp + 1;
l = strtol (p, &ccp, 0);
if (ccp == p || l < 0 || l > INT_MAX || l < sep->se_rpcversl || *ccp)
goto badafterall;
sep->se_rpcversh = l;
} else if (*ccp != '\0')
goto badafterall;
#else
syslog (LOG_ERR, "%s: rpc services not supported", sep->se_service);
#endif
}
}
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;
/* if ((arg = skip(&cp, 1)) == NULL) */
/* goto more; */
sep->se_user = newstr (skip (&cp));
arg = strchr (sep->se_user, '.');
if (arg == NULL)
arg = strchr (sep->se_user, ':');
if (arg) {
*arg++ = '\0';
sep->se_group = newstr (arg);
}
/* if ((arg = skip(&cp, 1)) == NULL) */
/* goto more; */
sep->se_server = newstr (skip (&cp));
if (strcmp (sep->se_server, "internal") == 0) {
#ifdef INETD_FEATURE_ENABLED
const struct builtin *bi;
for (bi = builtins; 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
syslog (LOG_ERR, "internal service %s unknown", sep->se_service);
goto more;
#endif
}
#ifdef INETD_FEATURE_ENABLED
else
sep->se_bi = NULL;
#endif
argc = 0;
for (arg = skip (&cp); cp; arg = skip (&cp)) {
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;
}
}
}
}
/* XXX BUG?: is this skip: label supposed to remain? */
skip:
nsep = nsep->se_next;
}
/*
* Finally, free any entries which failed the gethostbyname
* check.
*/
psep = NULL;
nsep = sep;
while (nsep != NULL) {
servtab_t *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);
}
#define Block_Using_Signals(m) do { sigemptyset(&m); \
sigaddset(&m, SIGCHLD); \
sigaddset(&m, SIGHUP); \
sigaddset(&m, SIGALRM); \
sigprocmask(SIG_BLOCK, &m, NULL); \
} while(0)
static servtab_t *enter (servtab_t *cp)
{
servtab_t *sep;
sigset_t omask;
sep = new_servtab();
*sep = *cp;
sep->se_fd = -1;
#ifdef CONFIG_FEATURE_INETD_RPC
sep->se_rpcprog = -1;
#endif
Block_Using_Signals(omask);
sep->se_next = servtab;
servtab = sep;
sigprocmask(SIG_UNBLOCK, &omask, NULL);
return (sep);
}
static int matchconf (servtab_t *old, servtab_t *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 &&
memcmp (&old->se_ctrladdr_in.sin_addr,
&new->se_ctrladdr_in.sin_addr,
sizeof (new->se_ctrladdr_in.sin_addr)) != 0)
return (0);
#ifdef CONFIG_FEATURE_IPV6
if (old->se_family == AF_INET6 && new->se_family == AF_INET6 &&
memcmp (&old->se_ctrladdr_in6.sin6_addr,
&new->se_ctrladdr_in6.sin6_addr,
sizeof (new->se_ctrladdr_in6.sin6_addr)) != 0)
return (0);
#endif
return (1);
}
static void config (int sig ATTRIBUTE_UNUSED)
{
servtab_t *sep, *cp, **sepp;
sigset_t omask;
int add;
size_t n;
char protoname[10];
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;
add = 0;
if (sep != 0) {
int i;
#define SWAP(type, a, b) do {type c=(type)a; a=(type)b; b=(type)c;} while (0)
Block_Using_Signals(omask);
/*
* sep->se_wait may be holding the pid of a daemon
* that we're waiting for. If so, don't overwrite
* it unless the config file explicitly says don't
* wait.
*/
if (
#ifdef INETD_FEATURE_ENABLED
cp->se_bi == 0 &&
#endif
(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
#ifdef CONFIG_FEATURE_INETD_RPC
if (isrpcservice (sep))
unregister_rpc (sep);
sep->se_rpcversl = cp->se_rpcversl;
sep->se_rpcversh = cp->se_rpcversh;
#endif
sigprocmask(SIG_UNBLOCK, &omask, NULL);
freeconfig (cp);
add = 1;
} else {
sep = enter (cp);
}
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;
safe_strncpy (sep->se_ctrladdr_un.sun_path, sep->se_service, n + 1);
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;
#ifdef CONFIG_FEATURE_INETD_RPC
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
#endif
{
u_short port = htons (atoi (sep->se_service));
if (!port) {
/*XXX*/ strncpy (protoname, sep->se_proto, sizeof (protoname));
if (isdigit (protoname[strlen (protoname) - 1]))
protoname[strlen (protoname) - 1] = '\0';
sp = getservbyname (sep->se_service, protoname);
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);
}
break;
#ifdef CONFIG_FEATURE_IPV6
case AF_INET6:
sep->se_ctrladdr_in6.sin6_family = AF_INET6;
/* se_ctrladdr_in was set in getconfigent */
sep->se_ctrladdr_size = sizeof sep->se_ctrladdr_in6;
#ifdef CONFIG_FEATURE_INETD_RPC
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
#endif
{
u_short port = htons (atoi (sep->se_service));
if (!port) {
/*XXX*/ strncpy (protoname, sep->se_proto, sizeof (protoname));
if (isdigit (protoname[strlen (protoname) - 1]))
protoname[strlen (protoname) - 1] = '\0';
sp = getservbyname (sep->se_service, protoname);
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_in6.sin6_port) {
sep->se_ctrladdr_in6.sin6_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);
}
break;
#endif /* CONFIG_FEATURE_IPV6 */
}
serv_unknown:
if (cp->se_next != NULL) {
servtab_t *tmp = cp;
cp = cp->se_next;
free (tmp);
} else {
free (cp);
cp = getconfigent ();
}
}
endconfig ();
/*
* Purge anything not looked at above.
*/
Block_Using_Signals(omask);
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);
}
#ifdef CONFIG_FEATURE_INETD_RPC
if (isrpcservice (sep))
unregister_rpc (sep);
#endif
if (sep->se_family == AF_UNIX)
(void) unlink (sep->se_service);
freeconfig (sep);
free (sep);
}
sigprocmask(SIG_UNBLOCK, &omask, NULL);
}
static void reapchild (int sig ATTRIBUTE_UNUSED)
{
pid_t pid;
int save_errno = errno, status;
servtab_t *sep;
for (;;) {
pid = wait3 (&status, WNOHANG, NULL);
if (pid <= 0)
break;
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++;
}
}
errno = save_errno;
}
static void retry (int sig ATTRIBUTE_UNUSED)
{
servtab_t *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:
#ifdef CONFIG_FEATURE_IPV6
case AF_INET6:
#endif
setup (sep);
#ifdef CONFIG_FEATURE_INETD_RPC
if (sep->se_fd != -1 && isrpcservice (sep))
register_rpc (sep);
#endif
break;
}
}
}
}
static void goaway (int sig ATTRIBUTE_UNUSED)
{
servtab_t *sep;
/* XXX signal race walking sep list */
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:
#ifdef CONFIG_FEATURE_IPV6
case AF_INET6:
#endif
#ifdef CONFIG_FEATURE_INETD_RPC
if (sep->se_wait == 1 && isrpcservice (sep))
unregister_rpc (sep); /* XXX signal race */
#endif
break;
}
(void) close (sep->se_fd);
}
(void) unlink (_PATH_INETDPID);
exit (0);
}
#ifdef INETD_SETPROCTITLE
static char **Argv;
static char *LastArg;
static void
inetd_setproctitle (char *a, int s)
{
socklen_t size;
char *cp;
struct sockaddr_in prt_sin;
char buf[80];
cp = Argv[0];
size = sizeof (prt_sin);
(void) snprintf (buf, sizeof buf, "-%s", a);
if (getpeername (s, (struct sockaddr *) &prt_sin, &size) == 0) {
char *sa = inet_ntoa (prt_sin.sin_addr);
buf[sizeof (buf) - 1 - strlen (sa) - 3] = '\0';
strcat (buf, " [");
strcat (buf, sa);
strcat (buf, "]");
}
strncpy (cp, buf, LastArg - cp);
cp += strlen (cp);
while (cp < LastArg)
*cp++ = ' ';
}
#endif
int
inetd_main (int argc, char *argv[])
{
servtab_t *sep;
struct passwd *pwd;
struct group *grp = NULL;
int tmpint;
struct sigaction sa, sapipe;
int opt;
pid_t pid;
char buf[50];
char *stoomany;
sigset_t omask, wait_mask;
#ifdef INETD_SETPROCTITLE
extern char **environ;
char **envp = environ;
Argv = argv;
if (envp == 0 || *envp == 0)
envp = argv;
while (*envp)
envp++;
LastArg = envp[-1] + strlen (envp[-1]);
#endif
openlog (bb_applet_name, LOG_PID | LOG_NOWAIT, LOG_DAEMON);
opt = bb_getopt_ulflags (argc, argv, "R:f", &stoomany);
if(opt & 1) {
char *e;
toomany = strtoul (stoomany, &e, 0);
if (!(toomany >= 0 && *e == '\0')) {
toomany = TOOMANY;
syslog (LOG_ERR, "-R %s: bad value for service invocation rate", stoomany);
}
}
argc -= optind;
argv += optind;
uid = getuid ();
if (uid != 0)
CONFIG = NULL;
if (argc > 0)
CONFIG = argv[0];
if (CONFIG == NULL)
bb_error_msg_and_die ("non-root must specify a config file");
if (!(opt & 2)) {
#ifdef BB_NOMMU
/* reexec for vfork() do continue parent */
vfork_daemon_rexec (0, 0, argc, argv, "-f");
#else
xdaemon (0, 0);
#endif
} else {
setsid ();
}
if (uid == 0) {
gid_t gid = getgid ();
/* If run by hand, ensure groups vector gets trashed */
setgroups (1, &gid);
}
{
FILE *fp;
if ((fp = fopen (_PATH_INETDPID, "w")) != NULL) {
fprintf (fp, "%u\n", getpid ());
(void) fclose (fp);
}
}
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;
}
memset ((char *) &sa, 0, sizeof (sa));
sigemptyset (&sa.sa_mask);
sigaddset (&sa.sa_mask, SIGALRM);
sigaddset (&sa.sa_mask, SIGCHLD);
sigaddset (&sa.sa_mask, SIGHUP);
sa.sa_handler = retry;
sigaction (SIGALRM, &sa, NULL);
/* doconfig(); */
config (SIGHUP);
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);
memset(&wait_mask, 0, sizeof(wait_mask));
{
/* 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 = -1;
fd_set readable;
if (nsock == 0) {
Block_Using_Signals(omask);
while (nsock == 0)
sigsuspend (&wait_mask);
sigprocmask(SIG_UNBLOCK, &omask, NULL);
}
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 (!sep->se_wait && sep->se_socktype == SOCK_STREAM) {
ctrl = accept (sep->se_fd, NULL, NULL);
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;
socklen_t 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;
Block_Using_Signals(omask);
pid = 0;
#ifdef INETD_FEATURE_ENABLED
if (sep->se_bi == 0 || sep->se_bi->bi_fork)
#endif
{
if (sep->se_count++ == 0)
(void) gettimeofday (&sep->se_time, NULL);
else if (toomany > 0 && 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);
if (!sep->se_wait && sep->se_socktype == SOCK_STREAM)
close (ctrl);
FD_CLR (sep->se_fd, &allsock);
(void) close (sep->se_fd);
sep->se_fd = -1;
sep->se_count = 0;
nsock--;
sigprocmask(SIG_UNBLOCK, &omask, NULL);
if (!timingout) {
timingout = 1;
alarm (RETRYTIME);
}
continue;
}
}
pid = fork ();
}
if (pid < 0) {
syslog (LOG_ERR, "fork: %m");
if (!sep->se_wait && sep->se_socktype == SOCK_STREAM)
close (ctrl);
sigprocmask(SIG_UNBLOCK, &omask, NULL);
sleep (1);
continue;
}
if (pid && sep->se_wait) {
sep->se_wait = pid;
FD_CLR (sep->se_fd, &allsock);
nsock--;
}
sigprocmask(SIG_UNBLOCK, &omask, NULL);
if (pid == 0) {
#ifdef INETD_FEATURE_ENABLED
if (sep->se_bi) {
(*sep->se_bi->bi_fn) (ctrl, sep);
} else
#endif
{
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 (sep->se_group) {
pwd->pw_gid = grp->gr_gid;
}
xsetgid ((gid_t) pwd->pw_gid);
initgroups (pwd->pw_name, pwd->pw_gid);
xsetuid((uid_t) pwd->pw_uid);
} else if (sep->se_group) {
xsetgid(grp->gr_gid);
setgroups (1, &grp->gr_gid);
}
dup2 (ctrl, 0);
close (ctrl);
dup2 (0, 1);
dup2 (0, 2);
if (rlim_ofile.rlim_cur != rlim_ofile_cur)
if (setrlimit (RLIMIT_NOFILE, &rlim_ofile) < 0)
syslog (LOG_ERR, "setrlimit: %m");
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);
}
}
}
/*
* Internet services provided internally by inetd:
*/
#define BUFSIZE 4096
#if defined(CONFIG_FEATURE_INETD_SUPPORT_BUILTIN_ECHO) || \
defined(CONFIG_FEATURE_INETD_SUPPORT_BUILTIN_CHARGEN) || \
defined(CONFIG_FEATURE_INETD_SUPPORT_BUILTIN_DAYTIME)
static int dg_badinput (struct sockaddr_in *dg_sin)
{
if (ntohs (dg_sin->sin_port) < IPPORT_RESERVED)
return (1);
if (dg_sin->sin_addr.s_addr == htonl (INADDR_BROADCAST))
return (1);
/* XXX compare against broadcast addresses in SIOCGIFCONF list? */
return (0);
}
#endif
#ifdef CONFIG_FEATURE_INETD_SUPPORT_BUILTIN_ECHO
/* Echo service -- echo data back */
/* ARGSUSED */
static void
echo_stream (int s, servtab_t *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);
}
/* Echo service -- echo data back */
/* ARGSUSED */
static void
echo_dg (int s, servtab_t *sep ATTRIBUTE_UNUSED)
{
char buffer[BUFSIZE];
int i;
socklen_t size;
/* struct sockaddr_storage ss; */
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));
}
#endif /* CONFIG_FEATURE_INETD_SUPPORT_BUILTIN_ECHO */
#ifdef CONFIG_FEATURE_INETD_SUPPORT_BUILTIN_DISCARD
/* Discard service -- ignore data */
/* ARGSUSED */
static void
discard_stream (int s, servtab_t *sep)
{
char buffer[BUFSIZE];
inetd_setproctitle (sep->se_service, s);
while ((errno = 0, read (s, buffer, sizeof (buffer)) > 0) ||
errno == EINTR);
exit (0);
}
/* Discard service -- ignore data */
/* ARGSUSED */
static void
discard_dg (int s, servtab_t *sep ATTRIBUTE_UNUSED)
{
char buffer[BUFSIZE];
(void) read (s, buffer, sizeof (buffer));
}
#endif /* CONFIG_FEATURE_INETD_SUPPORT_BUILTIN_DISCARD */
#ifdef CONFIG_FEATURE_INETD_SUPPORT_BUILTIN_CHARGEN
#define LINESIZ 72
static char ring[128];
static char *endring;
static void
initring (void)
{
int i;
endring = ring;
for (i = 0; i <= 128; ++i)
if (isprint (i))
*endring++ = i;
}
/* Character generator */
/* ARGSUSED */
static void
chargen_stream (int s, servtab_t *sep)
{
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);
}
/* Character generator */
/* ARGSUSED */
static void
chargen_dg (int s, servtab_t *sep ATTRIBUTE_UNUSED)
{
/* struct sockaddr_storage ss; */
struct sockaddr sa;
static char *rs;
int len;
char text[LINESIZ + 2];
socklen_t size;
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));
}
#endif /* CONFIG_FEATURE_INETD_SUPPORT_BUILTIN_CHARGEN */
#ifdef CONFIG_FEATURE_INETD_SUPPORT_BUILTIN_TIME
/*
* 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.
*/
static u_int machtime (void)
{
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 */
static void
machtime_stream (int s, servtab_t *sep ATTRIBUTE_UNUSED)
{
u_int result;
result = machtime ();
(void) write (s, (char *) &result, sizeof (result));
}
/* ARGSUSED */
static void
machtime_dg (int s, servtab_t *sep ATTRIBUTE_UNUSED)
{
u_int result;
/* struct sockaddr_storage ss; */
struct sockaddr sa;
struct sockaddr_in *dg_sin;
socklen_t size;
size = sizeof (sa);
if (recvfrom (s, (char *) &result, sizeof (result), 0, &sa, &size) < 0)
return;
/* if (dg_badinput((struct sockaddr *)&ss)) */
dg_sin = (struct sockaddr_in *) &sa;
if (dg_sin->sin_addr.s_addr == htonl (INADDR_BROADCAST) ||
ntohs (dg_sin->sin_port) < IPPORT_RESERVED / 2)
return;
result = machtime ();
(void) sendto (s, (char *) &result, sizeof (result), 0, &sa, sizeof (sa));
}
#endif /* CONFIG_FEATURE_INETD_SUPPORT_BUILTIN_TIME */
#ifdef CONFIG_FEATURE_INETD_SUPPORT_BUILTIN_DAYTIME
/* Return human-readable time of day */
/* ARGSUSED */
static void daytime_stream (int s, servtab_t *sep ATTRIBUTE_UNUSED)
{
char buffer[256];
time_t t;
t = time (NULL);
(void) sprintf (buffer, "%.24s\r\n", ctime (&t));
(void) write (s, buffer, strlen (buffer));
}
/* Return human-readable time of day */
/* ARGSUSED */
void
daytime_dg (int s, servtab_t *sep ATTRIBUTE_UNUSED)
{
char buffer[256];
time_t t;
/* struct sockaddr_storage ss; */
struct sockaddr sa;
socklen_t size;
t = 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 (&t));
(void) sendto (s, buffer, strlen (buffer), 0, &sa, sizeof (sa));
}
#endif /* CONFIG_FEATURE_INETD_SUPPORT_BUILTIN_DAYTIME */
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