+/* 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> */
+/* IPv6 support, many bug fixes by Denys Vlasenko (c) 2008 */
/*
* Copyright (c) 1983,1991 The Regents of the University of California.
* All rights reserved.
*
- * This code is derived from software contributed to Berkeley by
- * David A. Holland.
- *
- * Busybox port by Vladimir Oleynik (C) 2001-2003 <dzo@simtreas.ru>
- *
- * This program is free software; you can redistribute it and/or modify
- * it under the terms of the GNU General Public License as published by
- * the Free Software Foundation; either version 2 of the License, or
- * (at your option) any later version.
- *
- * This program is distributed in the hope that it will be useful,
- * but WITHOUT ANY WARRANTY; without even the implied warranty of
- * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
- * General Public License for more details.
- *
- * You should have received a copy of the GNU General Public License
- * along with this program; if not, write to the Free Software
- * Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA 02111-1307 USA
+ * 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
+/* Inetd - Internet super-server
*
- * This program invokes all internet services as needed.
- * connection-oriented services are invoked each time a
+ * This program invokes configured services when a connection
+ * from a peer is established or a datagram arrives.
+ * 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
+ * expected to do a getpeername to find out peer's 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''.
+ * on file descriptor 0. peer's address can be obtained
+ * using recvfrom.
*
* 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
+ * 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
+ * service_name must be in /etc/services
+ * socket_type stream/dgram/raw/rdm/seqpacket
* protocol must be in /etc/protocols
+ * (usually "tcp" or "udp")
* 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)
- *
- * RPC services unsuported
+ * user[.group] or user[:group] user/group 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:
+ * For RPC services
+ * service_name/version must be in /etc/rpc
+ * socket_type stream/dgram/raw/rdm/seqpacket
+ * rpc/protocol "rpc/tcp" etc
+ * 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)
*
- * 1) No group listed.
+ * 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) for root: NO setuid() or setgid() is done
+ * 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.
*
- * b) nonroot: setuid()
- * setgid(primary group as found in passwd)
- * initgroups(name, primary group)
+ * The hostaddress specifier may (and often will) contain dots;
+ * the service name must not.
*
- * 2) set-group-option on.
+ * 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.
*
- * a) for root: NO setuid()
- * setgid(specified group)
- * setgroups(1, specified group)
+ * Comment lines are indicated by a '#' in column 1.
+ */
+
+/* inetd rules for passing file descriptors to children
+ * (http://www.freebsd.org/cgi/man.cgi?query=inetd):
*
- * b) nonroot: setuid()
- * setgid(specified group)
- * initgroups(name, specified group)
+ * The wait/nowait entry specifies whether the server that is invoked by
+ * inetd will take over the socket associated with the service access point,
+ * and thus whether inetd should wait for the server to exit before listen-
+ * ing for new service requests. Datagram servers must use "wait", as
+ * they are always invoked with the original datagram socket bound to the
+ * specified service address. These servers must read at least one datagram
+ * from the socket before exiting. If a datagram server connects to its
+ * peer, freeing the socket so inetd can receive further messages on the
+ * socket, it is said to be a "multi-threaded" server; it should read one
+ * datagram from the socket and create a new socket connected to the peer.
+ * It should fork, and the parent should then exit to allow inetd to check
+ * for new service requests to spawn new servers. Datagram servers which
+ * process all incoming datagrams on a socket and eventually time out are
+ * said to be "single-threaded". The comsat(8), biff(1) and talkd(8)
+ * utilities are both examples of the latter type of datagram server. The
+ * tftpd(8) utility is an example of a multi-threaded datagram server.
*
- * All supplementary groups are discarded at startup in case inetd was
- * run manually.
+ * Servers using stream sockets generally are multi-threaded and use the
+ * "nowait" entry. Connection requests for these services are accepted by
+ * inetd, and the server is given only the newly-accepted socket connected
+ * to a client of the service. Most stream-based services operate in this
+ * manner. Stream-based servers that use "wait" are started with the lis-
+ * tening service socket, and must accept at least one connection request
+ * before exiting. Such a server would normally accept and process incoming
+ * connection requests until a timeout.
*/
-#define __USE_BSD_SIGNAL
+/* Despite of above doc saying that dgram services must use "wait",
+ * "udp nowait" servers are implemented in busyboxed inetd.
+ * IPv6 addresses are also implemented. However, they may look ugly -
+ * ":::service..." means "address '::' (IPv6 wildcard addr)":"service"...
+ * You have to put "tcp6"/"udp6" in protocol field to select IPv6.
+ */
-#include "busybox.h"
+/* Here's the scoop concerning the user[:group] feature:
+ * 1) group is not specified:
+ * a) user = root: NO setuid() or setgid() is done
+ * b) other: initgroups(name, primary group)
+ * setgid(primary group as found in passwd)
+ * setuid()
+ * 2) group is specified:
+ * a) user = root: setgid(specified group)
+ * NO initgroups()
+ * NO setuid()
+ * b) other: initgroups(name, specified group)
+ * setgid(specified group)
+ * setuid()
+ */
-#include <sys/param.h>
-#include <sys/stat.h>
-#include <sys/ioctl.h>
-#include <sys/socket.h>
+#include <syslog.h>
#include <sys/un.h>
-#include <sys/file.h>
-#include <sys/wait.h>
-#include <sys/time.h>
-#include <sys/resource.h>
-#ifndef __linux__
-#ifndef RLIMIT_NOFILE
-#define RLIMIT_NOFILE RLIMIT_OFILE
-#endif
-#endif
+#include "libbb.h"
-#include <sys/param.h>
-#include <sys/stat.h>
-#include <sys/ioctl.h>
-#include <sys/socket.h>
-#include <sys/file.h>
-#include <sys/wait.h>
-#include <sys/time.h>
-#include <sys/resource.h>
-
-#include <netinet/in.h>
-#include <netinet/ip.h>
-#include <arpa/inet.h>
-
-#include <errno.h>
-#include <signal.h>
-#include <netdb.h>
-#include <syslog.h>
-#include <stdio.h>
-#include <stdlib.h>
-#include <string.h>
-#include <getopt.h>
-#include <unistd.h>
-#include <stdarg.h>
-#include <time.h>
+#if ENABLE_FEATURE_INETD_RPC
+#include <rpc/rpc.h>
+#include <rpc/pmap_clnt.h>
+#endif
-#ifndef OPEN_MAX
-#define OPEN_MAX 64
+#if !BB_MMU
+/* stream version of chargen is forking but not execing,
+ * can't do that (easily) on NOMMU */
+#undef ENABLE_FEATURE_INETD_SUPPORT_BUILTIN_CHARGEN
+#define ENABLE_FEATURE_INETD_SUPPORT_BUILTIN_CHARGEN 0
#endif
-#define _PATH_INETDCONF "/etc/inetd.conf"
#define _PATH_INETDPID "/var/run/inetd.pid"
-#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 MAXARGV 20
+#define CNT_INTERVAL 60 /* servers in CNT_INTERVAL sec. */
+#define RETRYTIME 60 /* retry after bind or server fail */
-#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
+// TODO: explain, or get rid of setrlimit games
-/* Reserve some descriptors, 3 stdio + at least: 1 log, 1 conf. file */
-#define FD_MARGIN (8)
-
-/* Check unsupporting builtin */
-#if defined CONFIG_FEATURE_INETD_SUPPORT_BILTIN_ECHO || \
- defined CONFIG_FEATURE_INETD_SUPPORT_BILTIN_DISCARD || \
- defined CONFIG_FEATURE_INETD_SUPPORT_BILTIN_TIME || \
- defined CONFIG_FEATURE_INETD_SUPPORT_BILTIN_DAYTIME || \
- defined CONFIG_FEATURE_INETD_SUPPORT_BILTIN_CHARGEN
-# define INETD_FEATURE_ENABLED
+#ifndef RLIMIT_NOFILE
+#define RLIMIT_NOFILE RLIMIT_OFILE
#endif
-static 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 */
- 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 */
-#ifdef INETD_FEATURE_ENABLED
- const struct biltin *se_bi; /* if built-in, description */
+#ifndef OPEN_MAX
+#define OPEN_MAX 64
+#endif
+
+/* Reserve some descriptors, 3 stdio + at least: 1 log, 1 conf. file */
+#define FD_MARGIN 8
+
+#if ENABLE_FEATURE_INETD_SUPPORT_BUILTIN_DISCARD \
+ || ENABLE_FEATURE_INETD_SUPPORT_BUILTIN_ECHO \
+ || ENABLE_FEATURE_INETD_SUPPORT_BUILTIN_CHARGEN \
+ || ENABLE_FEATURE_INETD_SUPPORT_BUILTIN_TIME \
+ || ENABLE_FEATURE_INETD_SUPPORT_BUILTIN_DAYTIME
+# define INETD_BUILTINS_ENABLED
#endif
- char *se_server; /* server program */
- 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 */
- 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;
-
-#ifdef INETD_FEATURE_ENABLED
-struct biltin {
- 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, struct servtab *); /* fn which performs it */
-};
- /* Echo received data */
-#ifdef CONFIG_FEATURE_INETD_SUPPORT_BILTIN_ECHO
-static void echo_stream(int, struct servtab *);
-static void echo_dg(int, struct servtab *);
+typedef struct servtab_t {
+ /* The most frequently referenced one: */
+ int se_fd; /* open descriptor */
+ /* NB: 'biggest fields last' saves on code size (~250 bytes) */
+ /* [addr:]service socktype proto wait user[:group] prog [args] */
+ char *se_local_hostname; /* addr to listen on */
+ char *se_service; /* "80" or "www" or "mount/2[-3]" */
+ /* socktype is in se_socktype */ /* "stream" "dgram" "raw" "rdm" "seqpacket" */
+ char *se_proto; /* "unix" or "[rpc/]tcp[6]" */
+#if ENABLE_FEATURE_INETD_RPC
+ int se_rpcprog; /* rpc program number */
+ int se_rpcver_lo; /* rpc program lowest version */
+ int se_rpcver_hi; /* rpc program highest version */
+#define is_rpc_service(sep) ((sep)->se_rpcver_lo != 0)
+#else
+#define is_rpc_service(sep) 0
+#endif
+ pid_t se_wait; /* 0:"nowait", 1:"wait", >1:"wait" */
+ /* and waiting for this pid */
+ socktype_t se_socktype; /* SOCK_STREAM/DGRAM/RDM/... */
+ family_t se_family; /* AF_UNIX/INET[6] */
+ /* se_proto_no is used by RPC code only... hmm */
+ smallint se_proto_no; /* IPPROTO_TCP/UDP, n/a for AF_UNIX */
+ smallint se_checked; /* looked at during merge */
+ unsigned se_max; /* allowed instances per minute */
+ unsigned se_count; /* number started since se_time */
+ unsigned se_time; /* whem we started counting */
+ char *se_user; /* user name to run as */
+ char *se_group; /* group name to run as, can be NULL */
+#ifdef INETD_BUILTINS_ENABLED
+ const struct builtin *se_builtin; /* if built-in, description */
+#endif
+ struct servtab_t *se_next;
+ len_and_sockaddr *se_lsa;
+ char *se_program; /* server program */
+#define MAXARGV 20
+ char *se_argv[MAXARGV + 1]; /* program arguments */
+} servtab_t;
+
+#ifdef INETD_BUILTINS_ENABLED
+/* Echo received data */
+#if ENABLE_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_BILTIN_DISCARD
-static void discard_stream(int, struct servtab *);
-static void discard_dg(int, struct servtab *);
+/* Internet /dev/null */
+#if ENABLE_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_BILTIN_TIME
-static void machtime_stream(int, struct servtab *);
-static void machtime_dg(int, struct servtab *);
+/* Return 32 bit time since 1900 */
+#if ENABLE_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_BILTIN_DAYTIME
-static void daytime_stream(int, struct servtab *);
-static void daytime_dg(int, struct servtab *);
+/* Return human-readable time */
+#if ENABLE_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_BILTIN_CHARGEN
-static void chargen_stream(int, struct servtab *);
-static void chargen_dg(int, struct servtab *);
+/* Familiar character generator */
+#if ENABLE_FEATURE_INETD_SUPPORT_BUILTIN_CHARGEN
+static void chargen_stream(int, servtab_t *);
+static void chargen_dg(int, servtab_t *);
#endif
-static const struct biltin biltins[] = {
-#ifdef CONFIG_FEATURE_INETD_SUPPORT_BILTIN_ECHO
- /* Echo received data */
- { "echo", SOCK_STREAM, 1, 0, echo_stream, },
- { "echo", SOCK_DGRAM, 0, 0, echo_dg, },
+struct builtin {
+ /* NB: not necessarily NUL terminated */
+ char bi_service7[7]; /* internally provided service name */
+ uint8_t bi_fork; /* 1 if stream fn should run in child */
+ void (*bi_stream_fn)(int, servtab_t *);
+ void (*bi_dgram_fn)(int, servtab_t *);
+};
+
+static const struct builtin builtins[] = {
+#if ENABLE_FEATURE_INETD_SUPPORT_BUILTIN_ECHO
+ { "echo", 1, echo_stream, echo_dg },
#endif
-#ifdef CONFIG_FEATURE_INETD_SUPPORT_BILTIN_DISCARD
- /* Internet /dev/null */
- { "discard", SOCK_STREAM, 1, 0, discard_stream, },
- { "discard", SOCK_DGRAM, 0, 0, discard_dg, },
+#if ENABLE_FEATURE_INETD_SUPPORT_BUILTIN_DISCARD
+ { "discard", 1, discard_stream, discard_dg },
#endif
-#ifdef CONFIG_FEATURE_INETD_SUPPORT_BILTIN_TIME
- /* Return 32 bit time since 1900 */
- { "time", SOCK_STREAM, 0, 0, machtime_stream, },
- { "time", SOCK_DGRAM, 0, 0, machtime_dg, },
+#if ENABLE_FEATURE_INETD_SUPPORT_BUILTIN_CHARGEN
+ { "chargen", 1, chargen_stream, chargen_dg },
#endif
-#ifdef CONFIG_FEATURE_INETD_SUPPORT_BILTIN_DAYTIME
- /* Return human-readable time */
- { "daytime", SOCK_STREAM, 0, 0, daytime_stream, },
- { "daytime", SOCK_DGRAM, 0, 0, daytime_dg, },
+#if ENABLE_FEATURE_INETD_SUPPORT_BUILTIN_TIME
+ { "time", 0, machtime_stream, machtime_dg },
#endif
-#ifdef CONFIG_FEATURE_INETD_SUPPORT_BILTIN_CHARGEN
- /* Familiar character generator */
- { "chargen", SOCK_STREAM, 1, 0, chargen_stream, },
- { "chargen", SOCK_DGRAM, 0, 0, chargen_dg, },
+#if ENABLE_FEATURE_INETD_SUPPORT_BUILTIN_DAYTIME
+ { "daytime", 0, daytime_stream, daytime_dg },
#endif
- { NULL, 0, 0, 0, NULL }
};
-#endif /* INETD_FEATURE_ENABLED */
-
-#ifdef RLIMIT_NOFILE
-static struct rlimit rlim_ofile;
+#endif /* INETD_BUILTINS_ENABLED */
+
+struct globals {
+ rlim_t rlim_ofile_cur;
+ struct rlimit rlim_ofile;
+ servtab_t *serv_list;
+ int global_queuelen;
+ int prev_maxsock;
+ int maxsock;
+ unsigned max_concurrency;
+ smallint alarm_armed;
+ uid_t real_uid; /* user ID who ran us */
+ unsigned config_lineno;
+ const char *config_filename;
+ FILE *fconfig;
+ char *default_local_hostname;
+#if ENABLE_FEATURE_INETD_SUPPORT_BUILTIN_CHARGEN
+ char *end_ring;
+ char *ring_pos;
+ char ring[128];
#endif
+ fd_set allsock;
+ /* Used in next_line(), and as scratch read buffer */
+ char line[256]; /* _at least_ 256, see LINE_SIZE */
+};
+#define G (*(struct globals*)&bb_common_bufsiz1)
+enum { LINE_SIZE = COMMON_BUFSIZE - offsetof(struct globals, line) };
+struct BUG_G_too_big {
+ char BUG_G_too_big[sizeof(G) <= COMMON_BUFSIZE ? 1 : -1];
+};
+#define rlim_ofile_cur (G.rlim_ofile_cur )
+#define rlim_ofile (G.rlim_ofile )
+#define serv_list (G.serv_list )
+#define global_queuelen (G.global_queuelen)
+#define prev_maxsock (G.prev_maxsock )
+#define maxsock (G.maxsock )
+#define max_concurrency (G.max_concurrency)
+#define alarm_armed (G.alarm_armed )
+#define real_uid (G.real_uid )
+#define config_lineno (G.config_lineno )
+#define config_filename (G.config_filename)
+#define fconfig (G.fconfig )
+#define default_local_hostname (G.default_local_hostname)
+#define first_ps_byte (G.first_ps_byte )
+#define last_ps_byte (G.last_ps_byte )
+#define end_ring (G.end_ring )
+#define ring_pos (G.ring_pos )
+#define ring (G.ring )
+#define allsock (G.allsock )
+#define line (G.line )
+#define INIT_G() do { \
+ rlim_ofile_cur = OPEN_MAX; \
+ global_queuelen = 128; \
+ config_filename = "/etc/inetd.conf"; \
+} while (0)
+
+static void maybe_close(int fd)
+{
+ if (fd >= 0)
+ close(fd);
+}
-/* Length of socket listen queue. Should be per-service probably. */
-static int global_queuelen = 128;
-
-static FILE *fconfig;
-static sigset_t blockmask;
-static sigset_t emptymask;
-static fd_set allsock;
-static int nsock;
-static int maxsock;
-static int timingout;
-static int rlim_ofile_cur = OPEN_MAX;
-static const char *CONFIG = _PATH_INETDCONF;
-
-static void
-syslog_err_and_discard_dg(int se_socktype, const char *msg, ...)
- __attribute__ ((noreturn, format (printf, 2, 3)));
-
-static void
-syslog_err_and_discard_dg(int se_socktype, const char *msg, ...)
+// TODO: move to libbb?
+static len_and_sockaddr *xzalloc_lsa(int family)
{
- char buf[50];
- va_list p;
-
- va_start(p, msg);
- vsyslog(LOG_ERR, msg, p);
- if (se_socktype != SOCK_STREAM)
- recv(0, buf, sizeof (buf), 0);
- _exit(1);
+ len_and_sockaddr *lsa;
+ int sz;
+
+ sz = sizeof(struct sockaddr_in);
+ if (family == AF_UNIX)
+ sz = sizeof(struct sockaddr_un);
+#if ENABLE_FEATURE_IPV6
+ if (family == AF_INET6)
+ sz = sizeof(struct sockaddr_in6);
+#endif
+ lsa = xzalloc(LSA_LEN_SIZE + sz);
+ lsa->len = sz;
+ lsa->u.sa.sa_family = family;
+ return lsa;
}
-static struct servtab *getconfigent(void)
+static void rearm_alarm(void)
{
- static struct servtab serv;
- struct servtab *sep = &serv;
- int argc;
- char *cp = NULL;
- char *cp_ptr;
- char *cp_ptr_ptr = NULL;
-
-more:
- free(cp);
- cp = bb_get_chomped_line_from_file(fconfig);
- if (feof(fconfig)) {
- free(cp);
- return (NULL);
- }
- if ((cp == NULL) || (*cp == '#')) {
- goto more;
+ if (!alarm_armed) {
+ alarm_armed = 1;
+ alarm(RETRYTIME);
}
+}
- cp_ptr = strtok_r(cp, " \t", &cp_ptr_ptr);
- if (cp_ptr == NULL) {
- /* Error */
- goto more;
- }
- sep->se_service = bb_xstrdup(cp_ptr);
+static void block_CHLD_HUP_ALRM(sigset_t *m)
+{
+ sigemptyset(m);
+ sigaddset(m, SIGCHLD);
+ sigaddset(m, SIGHUP);
+ sigaddset(m, SIGALRM);
+ sigprocmask(SIG_BLOCK, m, m); /* old sigmask is stored in m */
+}
- cp_ptr = strtok_r(NULL, " \t", &cp_ptr_ptr);
- if (cp_ptr == NULL) {
- /* Error */
- goto more;
+static void restore_sigmask(sigset_t *m)
+{
+ sigprocmask(SIG_SETMASK, m, NULL);
+}
+
+#if ENABLE_FEATURE_INETD_RPC
+static void register_rpc(servtab_t *sep)
+{
+ int n;
+ struct sockaddr_in ir_sin;
+ socklen_t size;
+
+ size = sizeof(ir_sin);
+ if (getsockname(sep->se_fd, (struct sockaddr *) &ir_sin, &size) < 0) {
+ bb_perror_msg("getsockname");
+ return;
}
- if (strcmp(cp_ptr, "stream") == 0)
- sep->se_socktype = SOCK_STREAM;
- else if (strcmp(cp_ptr, "dgram") == 0)
- sep->se_socktype = SOCK_DGRAM;
- else if (strcmp(cp_ptr, "rdm") == 0)
- sep->se_socktype = SOCK_RDM;
- else if (strcmp(cp_ptr, "seqpacket") == 0)
- sep->se_socktype = SOCK_SEQPACKET;
- else if (strcmp(cp_ptr, "raw") == 0)
- sep->se_socktype = SOCK_RAW;
- else
- sep->se_socktype = -1;
- cp_ptr = strtok_r(NULL, " \t", &cp_ptr_ptr);
- if (cp_ptr == NULL) {
- /* error */
- goto more;
+ for (n = sep->se_rpcver_lo; n <= sep->se_rpcver_hi; n++) {
+ pmap_unset(sep->se_rpcprog, n);
+ if (!pmap_set(sep->se_rpcprog, n, sep->se_proto_no, ntohs(ir_sin.sin_port)))
+ bb_perror_msg("%s %s: pmap_set(%u,%u,%u,%u)",
+ sep->se_service, sep->se_proto,
+ sep->se_rpcprog, n, sep->se_proto_no, ntohs(ir_sin.sin_port));
}
- if (strcmp(cp_ptr, "unix") == 0) {
- sep->se_family = AF_UNIX;
- } else {
- if (strncmp(cp_ptr, "rpc/", 4) == 0) {
- syslog(LOG_ERR, "%s: rpc services not suported",
- sep->se_service);
- goto more;
- }
- sep->se_family = AF_INET;
+}
+
+static void unregister_rpc(servtab_t *sep)
+{
+ int n;
+
+ for (n = sep->se_rpcver_lo; n <= sep->se_rpcver_hi; n++) {
+ if (!pmap_unset(sep->se_rpcprog, n))
+ bb_perror_msg("pmap_unset(%u,%u)", sep->se_rpcprog, n);
}
- sep->se_proto = bb_xstrdup(cp_ptr);
+}
+#endif /* FEATURE_INETD_RPC */
- cp_ptr = strtok_r(NULL, " \t", &cp_ptr_ptr);
- if (cp_ptr == NULL) {
- /* error */
- goto more;
+static void bump_nofile(void)
+{
+ enum { FD_CHUNK = 32 };
+ struct rlimit rl;
+
+ /* Never fails under Linux (except if you pass it bad arguments) */
+ getrlimit(RLIMIT_NOFILE, &rl);
+ 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) {
+ bb_error_msg("can't extend file limit, max = %d",
+ (int) rl.rlim_cur);
+ return;
}
- {
- char *s = strchr(cp_ptr, '.');
- if (s) {
- *s++ = '\0';
- sep->se_max = atoi(s);
- } else
- sep->se_max = TOOMANY;
+
+ if (setrlimit(RLIMIT_NOFILE, &rl) < 0) {
+ bb_perror_msg("setrlimit");
+ return;
}
- sep->se_wait = strcmp(cp_ptr, "wait") == 0;
- cp_ptr = strtok_r(NULL, " \t", &cp_ptr_ptr);
- if (cp_ptr == NULL) {
- /* error */
- goto more;
+ rlim_ofile_cur = rl.rlim_cur;
+}
+
+static void remove_fd_from_set(int fd)
+{
+ if (fd >= 0) {
+ FD_CLR(fd, &allsock);
+ maxsock = -1;
}
- {
- char *cp_ptr2 = strchr(cp_ptr, '.');
- if (cp_ptr2) {
- *cp_ptr2++ = '\0';
- sep->se_group = bb_xstrdup(cp_ptr2);
+}
+
+static void add_fd_to_set(int fd)
+{
+ if (fd >= 0) {
+ FD_SET(fd, &allsock);
+ if (maxsock >= 0 && fd > maxsock) {
+ prev_maxsock = maxsock = fd;
+ if ((rlim_t)maxsock > rlim_ofile_cur - FD_MARGIN)
+ bump_nofile();
}
}
- sep->se_user = bb_xstrdup(cp_ptr);
+}
- cp_ptr = strtok_r(NULL, " \t", &cp_ptr_ptr);
- if (cp_ptr == NULL) {
- /* error */
- goto more;
+static void recalculate_maxsock(void)
+{
+ int fd = 0;
+ while (fd <= prev_maxsock) {
+ if (FD_ISSET(fd, &allsock))
+ maxsock = fd;
+ fd++;
}
- if (strcmp(cp_ptr, "internal") == 0) {
-#ifdef INETD_FEATURE_ENABLED
- const struct biltin *bi;
+ prev_maxsock = maxsock;
+ if ((rlim_t)maxsock > rlim_ofile_cur - FD_MARGIN)
+ bump_nofile();
+}
- for (bi = biltins; bi->bi_service; bi++) {
- if ((bi->bi_socktype == sep->se_socktype) &&
- (strcmp(bi->bi_service, sep->se_service) == 0)) {
- break;
- }
+static void prepare_socket_fd(servtab_t *sep)
+{
+ int r, fd;
+
+ fd = socket(sep->se_family, sep->se_socktype, 0);
+ if (fd < 0) {
+ bb_perror_msg("socket");
+ return;
+ }
+ setsockopt_reuseaddr(fd);
+
+#if ENABLE_FEATURE_INETD_RPC
+ if (is_rpc_service(sep)) {
+ struct passwd *pwd;
+
+ /* zero out the port for all RPC services; let bind()
+ * find one. */
+ set_nport(sep->se_lsa, 0);
+
+ /* for RPC services, attempt to use a reserved port
+ * if they are going to be running as root. */
+ if (real_uid == 0 && sep->se_family == AF_INET
+ && (pwd = getpwnam(sep->se_user)) != NULL
+ && pwd->pw_uid == 0
+ ) {
+ r = bindresvport(fd, &sep->se_lsa->u.sin);
+ } else {
+ r = bind(fd, &sep->se_lsa->u.sa, sep->se_lsa->len);
}
- if (bi->bi_service == 0) {
- syslog(LOG_ERR, "internal service %s unknown", sep->se_service);
- goto more;
+ if (r == 0) {
+ int saveerrno = errno;
+ /* update lsa with port# */
+ getsockname(fd, &sep->se_lsa->u.sa, &sep->se_lsa->len);
+ errno = saveerrno;
}
- sep->se_bi = bi;
- sep->se_wait = bi->bi_wait;
-#else
- syslog(LOG_ERR, "internal service %s unknown", cp_ptr);
- goto more;
+ } else
#endif
+ {
+ if (sep->se_family == AF_UNIX) {
+ struct sockaddr_un *sun;
+ sun = (struct sockaddr_un*)&(sep->se_lsa->u.sa);
+ unlink(sun->sun_path);
+ }
+ r = bind(fd, &sep->se_lsa->u.sa, sep->se_lsa->len);
}
-#ifdef INETD_FEATURE_ENABLED
- else {
- sep->se_bi = NULL;
+ if (r < 0) {
+ bb_perror_msg("%s/%s: bind",
+ sep->se_service, sep->se_proto);
+ close(fd);
+ rearm_alarm();
+ return;
}
-#endif
- sep->se_server = bb_xstrdup(cp_ptr);
+ if (sep->se_socktype == SOCK_STREAM)
+ listen(fd, global_queuelen);
- argc = 0;
- while ((cp_ptr = strtok_r(NULL, " \t", &cp_ptr_ptr)) != NULL) {
- if (argc < MAXARGV) {
- sep->se_argv[argc++] = cp_ptr;
- }
- }
- while (argc <= MAXARGV) {
- sep->se_argv[argc++] = NULL;
+ add_fd_to_set(fd);
+ sep->se_fd = fd;
+}
+
+static int reopen_config_file(void)
+{
+ free(default_local_hostname);
+ default_local_hostname = xstrdup("*");
+ if (fconfig != NULL)
+ fclose(fconfig);
+ config_lineno = 0;
+ fconfig = fopen_or_warn(config_filename, "r");
+ return (fconfig != NULL);
+}
+
+static void close_config_file(void)
+{
+ if (fconfig) {
+ fclose(fconfig);
+ fconfig = NULL;
}
+}
- //free(cp); // BUG: cp is the argv[] container; we must not free it here!
- return (sep);
+static char *next_line(void)
+{
+ if (fgets(line, LINE_SIZE, fconfig) == NULL)
+ return NULL;
+ config_lineno++;
+ *strchrnul(line, '\n') = '\0';
+ return line;
}
-static void freeconfig(struct servtab *cp)
+static char *next_word(char **cpp)
+{
+ char *start;
+ char *cp = *cpp;
+
+ if (cp == NULL)
+ return NULL;
+ again:
+ while (*cp == ' ' || *cp == '\t')
+ cp++;
+ if (*cp == '\0') {
+ int c = getc(fconfig);
+ ungetc(c, fconfig);
+ if (c == ' ' || c == '\t') {
+ cp = next_line();
+ if (cp)
+ goto again;
+ }
+ *cpp = NULL;
+ return NULL;
+ }
+ start = cp;
+ while (*cp && *cp != ' ' && *cp != '\t')
+ cp++;
+ if (*cp != '\0')
+ *cp++ = '\0';
+
+ *cpp = cp;
+ return start;
+}
+
+static void free_servtab_strings(servtab_t *cp)
{
int i;
+ free(cp->se_local_hostname);
free(cp->se_service);
free(cp->se_proto);
free(cp->se_user);
- /* Note: se_group is part of the newstr'ed se_user */
- free(cp->se_server);
+ free(cp->se_group);
+ free(cp->se_lsa); /* not a string in fact */
+ free(cp->se_program);
for (i = 0; i < MAXARGV; i++)
free(cp->se_argv[i]);
}
-#ifdef INETD_FEATURE_ENABLED
-static char **Argv;
-static char *LastArg;
-
-static void setproctitle(char *a, int s)
+static servtab_t *new_servtab(void)
{
- size_t size;
- char *cp;
- struct sockaddr_in sn;
- char buf[80];
-
- cp = Argv[0];
- size = sizeof(sn);
- if (getpeername(s, (struct sockaddr *)&sn, &size) == 0)
- (void) sprintf(buf, "-%s [%s]", a, inet_ntoa(sn.sin_addr));
- else
- (void) sprintf(buf, "-%s", a);
- strncpy(cp, buf, LastArg - cp);
- cp += strlen(cp);
- while (cp < LastArg)
- *cp++ = ' ';
+ servtab_t *newtab = xzalloc(sizeof(servtab_t));
+ newtab->se_fd = -1; /* paranoia */
+ return newtab;
}
-#endif /* INETD_FEATURE_ENABLED */
-
-static void setup(struct servtab *sep)
+static servtab_t *dup_servtab(servtab_t *sep)
{
- int on = 1;
+ servtab_t *newtab;
+ int argc;
- 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;
+ newtab = new_servtab();
+ *newtab = *sep; /* struct copy */
+ /* deep-copying strings */
+ newtab->se_service = xstrdup(newtab->se_service);
+ newtab->se_proto = xstrdup(newtab->se_proto);
+ newtab->se_user = xstrdup(newtab->se_user);
+ newtab->se_group = xstrdup(newtab->se_group);
+ newtab->se_program = xstrdup(newtab->se_program);
+ for (argc = 0; argc <= MAXARGV; argc++)
+ newtab->se_argv[argc] = xstrdup(newtab->se_argv[argc]);
+ /* NB: se_fd, se_hostaddr and se_next are always
+ * overwrittend by callers, so we don't bother resetting them
+ * to NULL/0/-1 etc */
+
+ return newtab;
+}
+
+/* gcc generates much more code if this is inlined */
+static NOINLINE servtab_t *parse_one_line(void)
+{
+ int argc;
+ char *p, *cp, *arg;
+ char *hostdelim;
+ servtab_t *sep;
+ servtab_t *nsep;
+ new:
+ sep = new_servtab();
+ more:
+ while ((cp = next_line()) && *cp == '#')
+ continue; /* skip comment lines */
+ if (cp == NULL) {
+ free(sep);
+ return NULL;
}
- if (setsockopt(sep->se_fd, SOL_SOCKET, SO_REUSEADDR, (void *)&on,
- sizeof(on)) < 0)
- syslog(LOG_ERR, "setsockopt (SO_REUSEADDR): %m");
- 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);
+
+ arg = next_word(&cp);
+ if (arg == NULL) /* a blank line. */
+ goto more;
+
+ /* [host:]service socktype proto wait user[:group] prog [args] */
+ /* Check for "host:...." line */
+ hostdelim = strrchr(arg, ':');
+ if (hostdelim) {
+ *hostdelim = '\0';
+ sep->se_local_hostname = xstrdup(arg);
+ arg = hostdelim + 1;
+ if (*arg == '\0') {
+ arg = next_word(&cp);
+ if (arg == NULL) {
+ /* Line has just "host:", change the
+ * default host for the following lines. */
+ free(default_local_hostname);
+ default_local_hostname = sep->se_local_hostname;
+ goto more;
+ }
}
- return;
+ } else
+ sep->se_local_hostname = xstrdup(default_local_hostname);
+
+ /* service socktype proto wait user[:group] prog [args] */
+ sep->se_service = xstrdup(arg);
+ /* socktype proto wait user[:group] prog [args] */
+ arg = next_word(&cp);
+ if (arg == NULL) {
+ parse_err:
+ bb_error_msg("parse error on line %u, line is ignored",
+ config_lineno);
+ free_servtab_strings(sep);
+ /* Just "goto more" can make sep to carry over e.g.
+ * "rpc"-ness (by having se_rpcver_lo != 0).
+ * We will be more paranoid: */
+ free(sep);
+ goto new;
}
- 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 (maxsock > rlim_ofile_cur - FD_MARGIN) {
-#ifdef RLIMIT_NOFILE
-# define FD_CHUNK 32
- struct rlimit rl;
-
- if (getrlimit(RLIMIT_NOFILE, &rl) < 0) {
- syslog(LOG_ERR, "getrlimit: %m");
- return;
+ {
+ static int8_t SOCK_xxx[] ALIGN1 = {
+ -1,
+ SOCK_STREAM, SOCK_DGRAM, SOCK_RDM,
+ SOCK_SEQPACKET, SOCK_RAW
+ };
+ sep->se_socktype = SOCK_xxx[1 + index_in_strings(
+ "stream""\0" "dgram""\0" "rdm""\0"
+ "seqpacket""\0" "raw""\0"
+ , arg)];
+ }
+
+ /* {unix,[rpc/]{tcp,udp}[6]} wait user[:group] prog [args] */
+ sep->se_proto = arg = xstrdup(next_word(&cp));
+ if (arg == NULL)
+ goto parse_err;
+ if (strcmp(arg, "unix") == 0) {
+ sep->se_family = AF_UNIX;
+ } else {
+ char *six;
+ sep->se_family = AF_INET;
+ six = last_char_is(arg, '6');
+ if (six) {
+#if ENABLE_FEATURE_IPV6
+ *six = '\0';
+ sep->se_family = AF_INET6;
+#else
+ bb_error_msg("%s: no support for IPv6", sep->se_proto);
+ goto parse_err;
+#endif
+ }
+ if (strncmp(arg, "rpc/", 4) == 0) {
+#if ENABLE_FEATURE_INETD_RPC
+ unsigned n;
+ arg += 4;
+ p = strchr(sep->se_service, '/');
+ if (p == NULL) {
+ bb_error_msg("no rpc version: '%s'", sep->se_service);
+ goto parse_err;
}
- rl.rlim_cur = rl.rlim_max < (rl.rlim_cur + FD_CHUNK) ? rl.rlim_max : (rl.rlim_cur + FD_CHUNK);
- if (rl.rlim_cur <= rlim_ofile_cur) {
- syslog(LOG_ERR,
-# if _FILE_OFFSET_BITS == 64
- "bump_nofile: cannot extend file limit, max = %lld",
-# else
- "bump_nofile: cannot extend file limit, max = %ld",
-# endif
- rl.rlim_cur);
- return;
+ *p++ = '\0';
+ n = bb_strtou(p, &p, 10);
+ if (n > INT_MAX) {
+ bad_ver_spec:
+ bb_error_msg("bad rpc version");
+ goto parse_err;
}
-
- if (setrlimit(RLIMIT_NOFILE, &rl) < 0) {
- syslog(LOG_ERR, "setrlimit: %m");
- return;
+ sep->se_rpcver_lo = sep->se_rpcver_hi = n;
+ if (*p == '-') {
+ p++;
+ n = bb_strtou(p, &p, 10);
+ if (n > INT_MAX || (int)n < sep->se_rpcver_lo)
+ goto bad_ver_spec;
+ sep->se_rpcver_hi = n;
}
-
- rlim_ofile_cur = rl.rlim_cur;
- return;
+ if (*p != '\0')
+ goto bad_ver_spec;
#else
- syslog(LOG_ERR, "bump_nofile: cannot extend file limit");
- return;
-#endif /* RLIMIT_NOFILE */
+ bb_error_msg("no support for rpc services");
+ goto parse_err;
+#endif
}
+ /* we don't really need getprotobyname()! */
+ if (strcmp(arg, "tcp") == 0)
+ sep->se_proto_no = IPPROTO_TCP; /* = 6 */
+ if (strcmp(arg, "udp") == 0)
+ sep->se_proto_no = IPPROTO_UDP; /* = 17 */
+ if (six)
+ *six = '6';
+ if (!sep->se_proto_no) /* not tcp/udp?? */
+ goto parse_err;
+ }
+
+ /* [no]wait[.max] user[:group] prog [args] */
+ arg = next_word(&cp);
+ if (arg == NULL)
+ goto parse_err;
+ sep->se_max = max_concurrency;
+ p = strchr(arg, '.');
+ if (p) {
+ *p++ = '\0';
+ sep->se_max = bb_strtou(p, NULL, 10);
+ if (errno)
+ goto parse_err;
}
+ sep->se_wait = (arg[0] != 'n' || arg[1] != 'o');
+ if (!sep->se_wait) /* "no" seen */
+ arg += 2;
+ if (strcmp(arg, "wait") != 0)
+ goto parse_err;
+
+ /* user[:group] prog [args] */
+ sep->se_user = xstrdup(next_word(&cp));
+ if (sep->se_user == NULL)
+ goto parse_err;
+ arg = strchr(sep->se_user, '.');
+ if (arg == NULL)
+ arg = strchr(sep->se_user, ':');
+ if (arg) {
+ *arg++ = '\0';
+ sep->se_group = xstrdup(arg);
+ }
+
+ /* prog [args] */
+ sep->se_program = xstrdup(next_word(&cp));
+ if (sep->se_program == NULL)
+ goto parse_err;
+#ifdef INETD_BUILTINS_ENABLED
+ if (strcmp(sep->se_program, "internal") == 0
+ && strlen(sep->se_service) <= 7
+ && (sep->se_socktype == SOCK_STREAM
+ || sep->se_socktype == SOCK_DGRAM)
+ ) {
+ unsigned i;
+ for (i = 0; i < ARRAY_SIZE(builtins); i++)
+ if (strncmp(builtins[i].bi_service7, sep->se_service, 7) == 0)
+ goto found_bi;
+ bb_error_msg("unknown internal service %s", sep->se_service);
+ goto parse_err;
+ found_bi:
+ sep->se_builtin = &builtins[i];
+ /* stream builtins must be "nowait", dgram must be "wait" */
+ if (sep->se_wait != (sep->se_socktype == SOCK_DGRAM))
+ goto parse_err;
+ }
+#endif
+ argc = 0;
+ while ((arg = next_word(&cp)) != NULL && argc < MAXARGV)
+ sep->se_argv[argc++] = xstrdup(arg);
+
+ /* catch mixups. "<service> stream udp ..." == wtf */
+ if (sep->se_socktype == SOCK_STREAM) {
+ if (sep->se_proto_no == IPPROTO_UDP)
+ goto parse_err;
+ }
+ if (sep->se_socktype == SOCK_DGRAM) {
+ if (sep->se_proto_no == IPPROTO_TCP)
+ goto parse_err;
+ }
+
+ /* check if the hostname specifier is a comma separated list
+ * of hostnames. we'll make new entries for each address. */
+ while ((hostdelim = strrchr(sep->se_local_hostname, ',')) != NULL) {
+ nsep = dup_servtab(sep);
+ /* NUL terminate the hostname field of the existing entry,
+ * and make a dup for the new entry. */
+ *hostdelim++ = '\0';
+ nsep->se_local_hostname = xstrdup(hostdelim);
+ nsep->se_next = sep->se_next;
+ sep->se_next = nsep;
+ }
+
+ /* was doing it here: */
+ /* DNS resolution, create copies for each IP address */
+ /* IPv6-ization destroyed it :( */
+
+ return sep;
}
-static void config(int signum)
+static servtab_t *insert_in_servlist(servtab_t *cp)
{
- struct servtab *sep, *cp, **sepp;
- sigset_t oldmask;
- unsigned n;
+ servtab_t *sep;
+ sigset_t omask;
+
+ sep = new_servtab();
+ *sep = *cp; /* struct copy */
+ sep->se_fd = -1;
+#if ENABLE_FEATURE_INETD_RPC
+ sep->se_rpcprog = -1;
+#endif
+ block_CHLD_HUP_ALRM(&omask);
+ sep->se_next = serv_list;
+ serv_list = sep;
+ restore_sigmask(&omask);
+ return sep;
+}
- (void)signum;
+static int same_serv_addr_proto(servtab_t *old, servtab_t *new)
+{
+ if (strcmp(old->se_local_hostname, new->se_local_hostname) != 0)
+ return 0;
+ if (strcmp(old->se_service, new->se_service) != 0)
+ return 0;
+ if (strcmp(old->se_proto, new->se_proto) != 0)
+ return 0;
+ return 1;
+}
- if (fconfig != NULL) {
- fseek(fconfig, 0L, L_SET);
- } else {
- fconfig = fopen(CONFIG, "r");
- if (fconfig == NULL) {
- syslog(LOG_ERR, "%s: %m", CONFIG);
- return;
- }
- }
+static void reread_config_file(int sig ATTRIBUTE_UNUSED)
+{
+ servtab_t *sep, *cp, **sepp;
+ len_and_sockaddr *lsa;
+ sigset_t omask;
+ unsigned n;
+ uint16_t port;
- for (sep = servtab; sep; sep = sep->se_next)
+ if (!reopen_config_file())
+ return;
+ for (sep = serv_list; sep; sep = sep->se_next)
sep->se_checked = 0;
- while ((cp = getconfigent()) != NULL) {
- 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)
+
+ goto first_line;
+ while (1) {
+ if (cp == NULL) {
+ first_line:
+ cp = parse_one_line();
+ if (cp == NULL)
break;
- if (sep != 0) {
+ }
+ for (sep = serv_list; sep; sep = sep->se_next)
+ if (same_serv_addr_proto(sep, cp))
+ goto equal_servtab;
+ /* not an "equal" servtab */
+ sep = insert_in_servlist(cp);
+ goto after_check;
+ equal_servtab:
+ {
int i;
-#define SWAP(type, a, b) {type c=(type)a; (type)a=(type)b; (type)b=(type)c;}
-
- sigprocmask(SIG_BLOCK, &emptymask, &oldmask);
- /*
- * 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 &&
+ block_CHLD_HUP_ALRM(&omask);
+#if ENABLE_FEATURE_INETD_RPC
+ if (is_rpc_service(sep))
+ unregister_rpc(sep);
+ sep->se_rpcver_lo = cp->se_rpcver_lo;
+ sep->se_rpcver_hi = cp->se_rpcver_hi;
#endif
- (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);
+ if (cp->se_wait == 0) {
+ /* New config says "nowait". If old one
+ * was "wait", we currently may be waiting
+ * for a child (and not accepting connects).
+ * Stop waiting, start listening again.
+ * (if it's not true, this op is harmless) */
+ add_fd_to_set(sep->se_fd);
+ }
+ sep->se_wait = cp->se_wait;
+ sep->se_max = cp->se_max;
+ /* string fields need more love - we don't want to leak them */
+#define SWAP(type, a, b) do { type c = (type)a; a = (type)b; b = (type)c; } while (0)
+ SWAP(char*, sep->se_user, cp->se_user);
+ SWAP(char*, sep->se_group, cp->se_group);
+ SWAP(char*, sep->se_program, cp->se_program);
for (i = 0; i < MAXARGV; i++)
- SWAP(char *, sep->se_argv[i], cp->se_argv[i]);
+ SWAP(char*, sep->se_argv[i], cp->se_argv[i]);
#undef SWAP
- sigprocmask(SIG_SETMASK, &oldmask, NULL);
- // This freeconfig() is probably a bug, since it will try and free()
- // each of the argv[] values, which are really just pointers
- // into the middle of a single line buffer for the config file.
- //freeconfig(cp); // BUG?
- } else {
- sep = (struct servtab *)xmalloc(sizeof (*sep));
- *sep = *cp;
- sep->se_fd = -1;
- sigprocmask(SIG_BLOCK, &blockmask, &oldmask);
- sep->se_next = servtab;
- servtab = sep;
- sigprocmask(SIG_SETMASK, &oldmask, NULL);
+ restore_sigmask(&omask);
+ free_servtab_strings(cp);
}
+ after_check:
+ /* cp->string_fields are consumed by insert_in_servlist()
+ * or freed at this point, cp itself is not yet freed. */
sep->se_checked = 1;
+ /* create new len_and_sockaddr */
switch (sep->se_family) {
+ struct sockaddr_un *sun;
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);
+ lsa = xzalloc_lsa(AF_UNIX);
+ sun = (struct sockaddr_un*)&lsa->u.sa;
+ safe_strncpy(sun->sun_path, sep->se_service, sizeof(sun->sun_path));
break;
- case AF_INET:
- sep->se_ctrladdr_in.sin_family = AF_INET;
- sep->se_ctrladdr_size = sizeof sep->se_ctrladdr_in;
- {
- u_short port = bb_lookup_port(sep->se_service, sep->se_proto, 0);
- if (port == 0) {
- syslog(LOG_ERR,
- "%s/%s: unknown service",
- sep->se_service, sep->se_proto);
- continue;
- }
- 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);
+ default: /* case AF_INET, case AF_INET6 */
+ n = bb_strtou(sep->se_service, NULL, 10);
+#if ENABLE_FEATURE_INETD_RPC
+ if (is_rpc_service(sep)) {
+ sep->se_rpcprog = n;
+ if (errno) { /* se_service is not numeric */
+ struct rpcent *rp = getrpcbyname(sep->se_service);
+ if (rp == NULL) {
+ bb_error_msg("%s: unknown rpc service", sep->se_service);
+ goto next_cp;
}
- sep->se_fd = -1;
+ sep->se_rpcprog = rp->r_number;
}
if (sep->se_fd == -1)
- setup(sep);
+ prepare_socket_fd(sep);
+ if (sep->se_fd != -1)
+ register_rpc(sep);
+ goto next_cp;
+ }
+#endif
+ /* what port to listen on? */
+ port = htons(n);
+ if (errno || n > 0xffff) { /* se_service is not numeric */
+ char protoname[4];
+ struct servent *sp;
+ /* can result only in "tcp" or "udp": */
+ safe_strncpy(protoname, sep->se_proto, 4);
+ sp = getservbyname(sep->se_service, protoname);
+ if (sp == NULL) {
+ bb_error_msg("%s/%s: unknown service",
+ sep->se_service, sep->se_proto);
+ goto next_cp;
+ }
+ port = sp->s_port;
+ }
+ if (LONE_CHAR(sep->se_local_hostname, '*')) {
+ lsa = xzalloc_lsa(sep->se_family);
+ set_nport(lsa, port);
+ } else {
+ lsa = host_and_af2sockaddr(sep->se_local_hostname,
+ ntohs(port), sep->se_family);
+ if (!lsa) {
+ bb_error_msg("%s/%s: unknown host '%s'",
+ sep->se_service, sep->se_proto,
+ sep->se_local_hostname);
+ goto next_cp;
+ }
}
+ break;
+ } /* end of "switch (sep->se_family)" */
+
+ /* did lsa change? Then close/open */
+ if (sep->se_lsa == NULL
+ || lsa->len != sep->se_lsa->len
+ || memcmp(&lsa->u.sa, &sep->se_lsa->u.sa, lsa->len) != 0
+ ) {
+ remove_fd_from_set(sep->se_fd);
+ maybe_close(sep->se_fd);
+ free(sep->se_lsa);
+ sep->se_lsa = lsa;
+ sep->se_fd = -1;
+ } else {
+ free(lsa);
}
- }
- if (fconfig) {
- (void) fclose(fconfig);
- fconfig = NULL;
- }
- /*
- * Purge anything not looked at above.
- */
- sigprocmask(SIG_SETMASK, &blockmask, &oldmask);
- sepp = &servtab;
- while ((sep = *sepp) != NULL) {
+ if (sep->se_fd == -1)
+ prepare_socket_fd(sep);
+ next_cp:
+ sep = cp->se_next;
+ free(cp);
+ cp = sep;
+ } /* end of "while (1) parse lines" */
+ close_config_file();
+
+ /* Purge anything not looked at above - these are stale entries,
+ * new config file doesnt have them. */
+ block_CHLD_HUP_ALRM(&omask);
+ sepp = &serv_list;
+ 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);
- }
+ remove_fd_from_set(sep->se_fd);
+ maybe_close(sep->se_fd);
+#if ENABLE_FEATURE_INETD_RPC
+ if (is_rpc_service(sep))
+ unregister_rpc(sep);
+#endif
if (sep->se_family == AF_UNIX)
- (void)unlink(sep->se_service);
- freeconfig(sep);
- free((char *)sep);
+ unlink(sep->se_service);
+ free_servtab_strings(sep);
+ free(sep);
}
- sigprocmask(SIG_SETMASK, &oldmask, NULL);
+ restore_sigmask(&omask);
}
-
-
-static void reapchild(int signum)
+static void reap_child(int sig ATTRIBUTE_UNUSED)
{
+ pid_t pid;
int status;
- int pid;
- struct servtab *sep;
+ servtab_t *sep;
+ int save_errno = errno;
- (void)signum;
for (;;) {
- pid = wait3(&status, WNOHANG, (struct rusage *)0);
+ pid = wait_any_nohang(&status);
if (pid <= 0)
break;
- for (sep = servtab; sep; sep = sep->se_next)
+ for (sep = serv_list; sep; sep = sep->se_next)
if (sep->se_wait == pid) {
+ /* One of our "wait" services */
if (WIFEXITED(status) && WEXITSTATUS(status))
- syslog(LOG_WARNING,
- "%s: exit status 0x%x",
- sep->se_server, WEXITSTATUS(status));
+ bb_error_msg("%s: exit status 0x%x",
+ sep->se_program, WEXITSTATUS(status));
else if (WIFSIGNALED(status))
- syslog(LOG_WARNING,
- "%s: exit signal 0x%x",
- sep->se_server, WTERMSIG(status));
+ bb_error_msg("%s: exit signal 0x%x",
+ sep->se_program, WTERMSIG(status));
sep->se_wait = 1;
- FD_SET(sep->se_fd, &allsock);
- nsock++;
+ add_fd_to_set(sep->se_fd);
}
}
+ errno = save_errno;
}
-static void retry(int signum)
+static void retry_network_setup(int sig ATTRIBUTE_UNUSED)
{
- struct servtab *sep;
+ servtab_t *sep;
- (void)signum;
- timingout = 0;
- for (sep = servtab; sep; sep = sep->se_next) {
+ alarm_armed = 0;
+ for (sep = serv_list; sep; sep = sep->se_next) {
if (sep->se_fd == -1) {
- switch (sep->se_family) {
- case AF_UNIX:
- case AF_INET:
- setup(sep);
- break;
- }
+ prepare_socket_fd(sep);
+#if ENABLE_FEATURE_INETD_RPC
+ if (sep->se_fd != -1 && is_rpc_service(sep))
+ register_rpc(sep);
+#endif
}
}
}
-static void goaway(int signum)
-{
- struct servtab *sep;
-
- (void)signum;
- for (sep = servtab; sep; sep = sep->se_next)
- if (sep->se_fd != -1 && sep->se_family == AF_UNIX)
- (void)unlink(sep->se_service);
- (void)unlink(_PATH_INETDPID);
- exit(0);
-}
-
-
-
-extern int inetd_main(int argc, char *argv[])
+static void clean_up_and_exit(int sig ATTRIBUTE_UNUSED)
{
- struct servtab *sep;
- struct group *grp = NULL;
- struct sigaction sa;
- int pid;
- unsigned long opt;
- char *sq;
- gid_t gid;
-
-#ifdef INETD_FEATURE_ENABLED
- extern char **environ;
-#endif
+ servtab_t *sep;
- gid = getgid();
- setgroups(1, &gid);
+ /* XXX signal race walking sep list */
+ for (sep = serv_list; sep; sep = sep->se_next) {
+ if (sep->se_fd == -1)
+ continue;
-#ifdef INETD_FEATURE_ENABLED
- Argv = argv;
- if (environ == 0 || *environ == 0)
- environ = argv;
- while (*environ)
- environ++;
- LastArg = environ[-1] + strlen(environ[-1]);
+ switch (sep->se_family) {
+ case AF_UNIX:
+ unlink(sep->se_service);
+ break;
+ default: /* case AF_INET, AF_INET6 */
+#if ENABLE_FEATURE_INETD_RPC
+ if (sep->se_wait == 1 && is_rpc_service(sep))
+ unregister_rpc(sep); /* XXX signal race */
#endif
-
-#if defined(__uClinux__)
- opt = bb_getopt_ulflags(argc, argv, "q:f", &sq);
- if (!(opt & 2)) {
- daemon(0, 0);
- /* reexec for vfork() do continue parent */
- vfork_daemon_rexec(argc, argv, "-f");
+ break;
+ }
+ if (ENABLE_FEATURE_CLEAN_UP)
+ close(sep->se_fd);
}
-#else
- opt = bb_getopt_ulflags(argc, argv, "q:", &sq);
- daemon(0, 0);
-#endif /* uClinux */
+ remove_pidfile(_PATH_INETDPID);
+ exit(EXIT_SUCCESS);
+}
- if(opt & 1) {
- global_queuelen = atoi(optarg);
- if (global_queuelen < 8) global_queuelen=8;
- }
- argc -= optind;
+int inetd_main(int argc, char **argv) MAIN_EXTERNALLY_VISIBLE;
+int inetd_main(int argc ATTRIBUTE_UNUSED, char **argv)
+{
+ struct sigaction sa, saved_pipe_handler;
+ servtab_t *sep, *sep2;
+ struct passwd *pwd;
+ struct group *grp = grp; /* for compiler */
+ int opt;
+ pid_t pid;
+ sigset_t omask;
+
+ INIT_G();
+
+ real_uid = getuid();
+ if (real_uid != 0) /* run by non-root user */
+ config_filename = NULL;
+
+ opt_complementary = "R+:q+"; /* -q N, -R N */
+ opt = getopt32(argv, "R:feq:", &max_concurrency, &global_queuelen);
argv += optind;
-
- if (argc > 0)
- CONFIG = argv[0];
-
- openlog(bb_applet_name, LOG_PID | LOG_NOWAIT, LOG_DAEMON);
- {
- FILE *fp;
-
- if ((fp = fopen(_PATH_INETDPID, "w")) != NULL) {
- fprintf(fp, "%u\n", getpid());
- (void)fclose(fp);
- }
+ //argc -= optind;
+ if (argv[0])
+ config_filename = argv[0];
+ if (config_filename == NULL)
+ bb_error_msg_and_die("non-root must specify config file");
+ if (!(opt & 2))
+ bb_daemonize_or_rexec(0, argv - optind);
+ else
+ bb_sanitize_stdio();
+ if (!(opt & 4)) {
+ openlog(applet_name, LOG_PID | LOG_NOWAIT, LOG_DAEMON);
+ logmode = LOGMODE_SYSLOG;
}
-#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;
+ if (real_uid == 0) {
+ /* run by root, ensure groups vector gets trashed */
+ gid_t gid = getgid();
+ setgroups(1, &gid);
}
-#endif
- config(0);
+ write_pidfile(_PATH_INETDPID);
- sigemptyset(&emptymask);
- sigemptyset(&blockmask);
- sigaddset(&blockmask, SIGCHLD);
- sigaddset(&blockmask, SIGHUP);
- sigaddset(&blockmask, SIGALRM);
+ /* never fails under Linux (except if you pass it bad arguments) */
+ getrlimit(RLIMIT_NOFILE, &rlim_ofile);
+ rlim_ofile_cur = rlim_ofile.rlim_cur;
+ if (rlim_ofile_cur == RLIM_INFINITY) /* ! */
+ rlim_ofile_cur = OPEN_MAX;
memset(&sa, 0, sizeof(sa));
- sa.sa_mask = blockmask;
- sa.sa_handler = retry;
- sigaction(SIGALRM, &sa, NULL);
- 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);
+ /*sigemptyset(&sa.sa_mask); - memset did it */
+ sigaddset(&sa.sa_mask, SIGALRM);
+ sigaddset(&sa.sa_mask, SIGCHLD);
+ sigaddset(&sa.sa_mask, SIGHUP);
+ sa.sa_handler = retry_network_setup;
+ sigaction_set(SIGALRM, &sa);
+ sa.sa_handler = reread_config_file;
+ sigaction_set(SIGHUP, &sa);
+ sa.sa_handler = reap_child;
+ sigaction_set(SIGCHLD, &sa);
+ sa.sa_handler = clean_up_and_exit;
+ sigaction_set(SIGTERM, &sa);
+ sa.sa_handler = clean_up_and_exit;
+ sigaction_set(SIGINT, &sa);
sa.sa_handler = SIG_IGN;
- sigaction(SIGPIPE, &sa, NULL);
+ sigaction(SIGPIPE, &sa, &saved_pipe_handler);
- {
- /* 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);
- }
+ reread_config_file(SIGHUP); /* load config from file */
for (;;) {
+ int ready_fd_cnt;
+ int ctrl, accepted_fd, new_udp_fd;
fd_set readable;
- int ctrl;
- int n;
- if (nsock == 0) {
- sigprocmask(SIG_BLOCK, &blockmask, NULL);
- while (nsock == 0) {
- sigsuspend(&emptymask);
+ if (maxsock < 0)
+ recalculate_maxsock();
+
+ readable = allsock; /* struct copy */
+ /* if there are no fds to wait on, we will block
+ * until signal wakes us up */
+ ready_fd_cnt = select(maxsock + 1, &readable, NULL, NULL, NULL);
+ if (ready_fd_cnt < 0) {
+ if (errno != EINTR) {
+ bb_perror_msg("select");
+ sleep(1);
}
- sigprocmask(SIG_SETMASK, &emptymask, NULL);
- }
- readable = allsock;
- n = select(maxsock + 1, &readable, (fd_set *)0, (fd_set *)0, (struct timeval *)0);
- if (n <= 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) {
- /* Fixed AGC */
- fcntl(sep->se_fd, F_SETFL, O_NDELAY);
- /* --------- */
- ctrl = accept(sep->se_fd, NULL, NULL);
- fcntl(sep->se_fd, F_SETFL, 0);
+ }
+
+ for (sep = serv_list; ready_fd_cnt && sep; sep = sep->se_next) {
+ if (sep->se_fd == -1 || !FD_ISSET(sep->se_fd, &readable))
+ continue;
+
+ ready_fd_cnt--;
+ ctrl = sep->se_fd;
+ accepted_fd = -1;
+ new_udp_fd = -1;
+ if (!sep->se_wait) {
+ if (sep->se_socktype == SOCK_STREAM) {
+ ctrl = accepted_fd = accept(sep->se_fd, NULL, NULL);
if (ctrl < 0) {
- if (errno == EINTR || errno == EWOULDBLOCK) {
- continue;
- }
- syslog(LOG_WARNING, "accept (for %s): %m",
- sep->se_service);
+ if (errno != EINTR)
+ bb_perror_msg("accept (for %s)", sep->se_service);
continue;
}
- } else {
- ctrl = sep->se_fd;
}
- sigprocmask(SIG_BLOCK, &blockmask, NULL);
- pid = 0;
-#ifdef INETD_FEATURE_ENABLED
- if (sep->se_bi == 0 || sep->se_bi->bi_fork)
-#endif
- {
- if (sep->se_count++ == 0) {
- gettimeofday(&sep->se_time, (struct timezone *)0);
+ /* "nowait" udp */
+ if (sep->se_socktype == SOCK_DGRAM
+ && sep->se_family != AF_UNIX
+ ) {
+/* How udp "nowait" works:
+ * child peeks at (received and buffered by kernel) UDP packet,
+ * performs connect() on the socket so that it is linked only
+ * to this peer. But this also affects parent, because descriptors
+ * are shared after fork() a-la dup(). When parent performs
+ * select(), it will see this descriptor connected to the peer (!)
+ * and still readable, will act on it and mess things up
+ * (can create many copies of same child, etc).
+ * Parent must create and use new socket instead. */
+ new_udp_fd = socket(sep->se_family, SOCK_DGRAM, 0);
+ if (new_udp_fd < 0) { /* error: eat packet, forget about it */
+ udp_err:
+ recv(sep->se_fd, line, LINE_SIZE, MSG_DONTWAIT);
+ continue;
+ }
+ setsockopt_reuseaddr(new_udp_fd);
+ /* TODO: better do bind after vfork in parent,
+ * so that we don't have two wildcard bound sockets
+ * even for a brief moment? */
+ if (bind(new_udp_fd, &sep->se_lsa->u.sa, sep->se_lsa->len) < 0) {
+ close(new_udp_fd);
+ goto udp_err;
}
+ }
+ }
+
+ block_CHLD_HUP_ALRM(&omask);
+ pid = 0;
+#ifdef INETD_BUILTINS_ENABLED
+ /* do we need to fork? */
+ if (sep->se_builtin == NULL
+ || (sep->se_socktype == SOCK_STREAM
+ && sep->se_builtin->bi_fork))
+#endif
+ {
+ if (sep->se_max != 0) {
+ if (++sep->se_count == 1)
+ sep->se_time = monotonic_sec();
else if (sep->se_count >= sep->se_max) {
- struct timeval now;
-
- 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",
- sep->se_service, sep->se_proto);
- FD_CLR(sep->se_fd, &allsock);
+ unsigned now = monotonic_sec();
+ /* did we accumulate se_max connects too quickly? */
+ if (now - sep->se_time <= CNT_INTERVAL) {
+ bb_error_msg("%s/%s: too many connections, pausing",
+ sep->se_service, sep->se_proto);
+ remove_fd_from_set(sep->se_fd);
close(sep->se_fd);
sep->se_fd = -1;
sep->se_count = 0;
- nsock--;
- sigprocmask(SIG_SETMASK, &emptymask, NULL);
- 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);
+ rearm_alarm(); /* will revive it in RETRYTIME sec */
+ restore_sigmask(&omask);
+ maybe_close(accepted_fd);
+ continue; /* -> check next fd in fd set */
}
- sigprocmask(SIG_SETMASK, &emptymask, NULL);
- sleep(1);
- continue;
- }
- if (pid && sep->se_wait) {
- sep->se_wait = pid;
- FD_CLR(sep->se_fd, &allsock);
- nsock--;
+ sep->se_count = 0;
}
}
- sigprocmask(SIG_SETMASK, &emptymask, NULL);
- if (pid == 0) {
-#ifdef INETD_FEATURE_ENABLED
- if (sep->se_bi) {
- (*sep->se_bi->bi_fn)(ctrl, sep);
- } else
-#endif
- {
- struct passwd *pwd = getpwnam(sep->se_user);
- if (pwd == NULL) {
- syslog_err_and_discard_dg(
- sep->se_socktype,
- "getpwnam: %s: No such user",
- sep->se_user);
- }
- if (sep->se_group && (grp = getgrnam(sep->se_group)) == NULL) {
- syslog_err_and_discard_dg(sep->se_socktype,
- "getgrnam: %s: No such group", sep->se_group);
- }
- /*
- * Ok. There are four cases here:
- * 1. nonroot user, no group specified
- * 2. nonroot user, some group specified
- * 3. root user, no group specified
- * 4. root user, some group specified
- * In cases 2 and 4 we setgid to the specified
- * group. In cases 1 and 2 we run initgroups
- * to run with the groups of the given user.
- * In case 4 we do setgroups to run with the
- * given group. In case 3 we do nothing.
- */
- if (pwd->pw_uid) {
- if (sep->se_group) {
- pwd->pw_gid = grp->gr_gid;
- }
- setgid((gid_t)pwd->pw_gid);
- initgroups(pwd->pw_name, pwd->pw_gid);
- setuid((uid_t)pwd->pw_uid);
- } else if (sep->se_group) {
- setgid((gid_t)grp->gr_gid);
- setgroups(1, &grp->gr_gid);
- }
- 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");
- }
- }
+ /* on NOMMU, streamed chargen
+ * builtin wouldn't work, but it is
+ * not allowed on NOMMU (ifdefed out) */
+#ifdef INETD_BUILTINS_ENABLED
+ if (BB_MMU && sep->se_builtin)
+ pid = fork();
+ else
#endif
- for (ctrl = rlim_ofile_cur-1; --ctrl > 2; ) {
- (void)close(ctrl);
- }
- memset(&sa, 0, sizeof(sa));
- sa.sa_handler = SIG_DFL;
- sigaction(SIGPIPE, &sa, NULL);
-
- execv(sep->se_server, sep->se_argv);
- syslog_err_and_discard_dg(sep->se_socktype, "execv %s: %m", sep->se_server);
- }
+ pid = vfork();
+
+ if (pid < 0) { /* fork error */
+ bb_perror_msg(BB_MMU ? "vfork" + 1 : "vfork");
+ sleep(1);
+ restore_sigmask(&omask);
+ maybe_close(accepted_fd);
+ continue; /* -> check next fd in fd set */
}
- if (!sep->se_wait && sep->se_socktype == SOCK_STREAM) {
- close(ctrl);
+ if (pid == 0)
+ pid--; /* -1: "we did fork and we are child" */
+ }
+ /* if pid == 0 here, we never forked */
+
+ if (pid > 0) { /* parent */
+ if (sep->se_wait) {
+ /* tcp wait: we passed listening socket to child,
+ * will wait for child to terminate */
+ sep->se_wait = pid;
+ remove_fd_from_set(sep->se_fd);
}
+ if (new_udp_fd >= 0) {
+ /* udp nowait: child connected the socket,
+ * we created and will use new, unconnected one */
+ xmove_fd(new_udp_fd, sep->se_fd);
+ }
+ restore_sigmask(&omask);
+ maybe_close(accepted_fd);
+ continue; /* -> check next fd in fd set */
}
- }
- }
+
+ /* we are either child or didn't vfork at all */
+#ifdef INETD_BUILTINS_ENABLED
+ if (sep->se_builtin) {
+ if (pid) { /* "pid" is -1: we did vfork */
+ close(sep->se_fd); /* listening socket */
+ logmode = 0; /* make xwrite etc silent */
+ }
+ restore_sigmask(&omask);
+ if (sep->se_socktype == SOCK_STREAM)
+ sep->se_builtin->bi_stream_fn(ctrl, sep);
+ else
+ sep->se_builtin->bi_dgram_fn(ctrl, sep);
+ if (pid) /* we did vfork */
+ _exit(EXIT_FAILURE);
+ maybe_close(accepted_fd);
+ continue; /* -> check next fd in fd set */
+ }
+#endif
+ /* child */
+ setsid();
+ /* "nowait" udp */
+ if (new_udp_fd >= 0) {
+ len_and_sockaddr *lsa = xzalloc_lsa(sep->se_family);
+ /* peek at the packet and remember peer addr */
+ int r = recvfrom(ctrl, NULL, 0, MSG_PEEK|MSG_DONTWAIT,
+ &lsa->u.sa, &lsa->len);
+ if (r < 0)
+ goto do_exit1;
+ /* make this socket "connected" to peer addr:
+ * only packets from this peer will be recv'ed,
+ * and bare write()/send() will work on it */
+ connect(ctrl, &lsa->u.sa, lsa->len);
+ free(lsa);
+ }
+ /* prepare env and exec program */
+ pwd = getpwnam(sep->se_user);
+ if (pwd == NULL) {
+ bb_error_msg("%s: no such user", sep->se_user);
+ goto do_exit1;
+ }
+ if (sep->se_group && (grp = getgrnam(sep->se_group)) == NULL) {
+ bb_error_msg("%s: no such group", sep->se_group);
+ goto do_exit1;
+ }
+ if (real_uid != 0 && real_uid != pwd->pw_uid) {
+ /* a user running private inetd */
+ bb_error_msg("non-root must run services as himself");
+ goto do_exit1;
+ }
+ if (pwd->pw_uid) {
+ if (sep->se_group)
+ pwd->pw_gid = grp->gr_gid;
+ /* initgroups, setgid, setuid: */
+ change_identity(pwd);
+ } else if (sep->se_group) {
+ xsetgid(grp->gr_gid);
+ setgroups(1, &grp->gr_gid);
+ }
+ if (rlim_ofile.rlim_cur != rlim_ofile_cur)
+ if (setrlimit(RLIMIT_NOFILE, &rlim_ofile) < 0)
+ bb_perror_msg("setrlimit");
+ closelog();
+ xmove_fd(ctrl, 0);
+ xdup2(0, 1);
+ xdup2(0, 2);
+ /* NB: among others, this loop closes listening socket
+ * for nowait stream children */
+ for (sep2 = serv_list; sep2; sep2 = sep2->se_next)
+ maybe_close(sep2->se_fd);
+ sigaction_set(SIGPIPE, &saved_pipe_handler);
+ restore_sigmask(&omask);
+ BB_EXECVP(sep->se_program, sep->se_argv);
+ bb_perror_msg("exec %s", sep->se_program);
+ do_exit1:
+ /* eat packet in udp case */
+ if (sep->se_socktype != SOCK_STREAM)
+ recv(0, line, LINE_SIZE, MSG_DONTWAIT);
+ _exit(EXIT_FAILURE);
+ } /* for (sep = servtab...) */
+ } /* for (;;) */
}
+#if !BB_MMU
+static const char *const cat_args[] = { "cat", NULL };
+#endif
/*
* Internet services provided internally by inetd:
*/
-#define BUFSIZE 4096
-
-#ifdef CONFIG_FEATURE_INETD_SUPPORT_BILTIN_ECHO
-/* Echo service -- echo data back */
-static void echo_stream(int s, struct servtab *sep)
+#if ENABLE_FEATURE_INETD_SUPPORT_BUILTIN_ECHO
+/* Echo service -- echo data back. */
+/* ARGSUSED */
+static void echo_stream(int s, servtab_t *sep ATTRIBUTE_UNUSED)
{
- char buffer[BUFSIZE];
- int i;
-
- setproctitle(sep->se_service, s);
- while ((i = read(s, buffer, sizeof(buffer))) > 0 &&
- write(s, buffer, i) > 0)
- ;
- exit(0);
+#if BB_MMU
+ while (1) {
+ ssize_t sz = safe_read(s, line, LINE_SIZE);
+ if (sz <= 0)
+ break;
+ xwrite(s, line, sz);
+ }
+#else
+ /* We are after vfork here! */
+ /* move network socket to stdin/stdout */
+ xmove_fd(s, STDIN_FILENO);
+ xdup2(STDIN_FILENO, STDOUT_FILENO);
+ /* no error messages please... */
+ close(STDERR_FILENO);
+ xopen("/dev/null", O_WRONLY);
+ BB_EXECVP("cat", (char**)cat_args);
+ /* on failure we return to main, which does exit(EXIT_FAILURE) */
+#endif
}
-
-/* Echo service -- echo data back */
-static void echo_dg(int s, struct servtab *sep)
+static void echo_dg(int s, servtab_t *sep)
{
- char buffer[BUFSIZE];
- int i;
- size_t size;
- struct sockaddr sa;
-
- (void)sep;
-
- size = sizeof(sa);
- if ((i = recvfrom(s, buffer, sizeof(buffer), 0, &sa, &size)) < 0)
- return;
- (void) sendto(s, buffer, i, 0, &sa, sizeof(sa));
+ enum { BUFSIZE = 12*1024 }; /* for jumbo sized packets! :) */
+ char *buf = xmalloc(BUFSIZE); /* too big for stack */
+ int sz;
+ len_and_sockaddr *lsa = alloca(LSA_LEN_SIZE + sep->se_lsa->len);
+
+ lsa->len = sep->se_lsa->len;
+ /* dgram builtins are non-forking - DONT BLOCK! */
+ sz = recvfrom(s, buf, BUFSIZE, MSG_DONTWAIT, &lsa->u.sa, &lsa->len);
+ if (sz > 0)
+ sendto(s, buf, sz, 0, &lsa->u.sa, lsa->len);
+ free(buf);
}
-#endif /* CONFIG_FEATURE_INETD_SUPPORT_BILTIN_ECHO */
+#endif /* FEATURE_INETD_SUPPORT_BUILTIN_ECHO */
-#ifdef CONFIG_FEATURE_INETD_SUPPORT_BILTIN_DISCARD
-/* Discard service -- ignore data */
-static void discard_stream(int s, struct servtab *sep)
+#if ENABLE_FEATURE_INETD_SUPPORT_BUILTIN_DISCARD
+/* Discard service -- ignore data. MMU arches only. */
+/* ARGSUSED */
+static void discard_stream(int s, servtab_t *sep ATTRIBUTE_UNUSED)
{
- char buffer[BUFSIZE];
-
- setproctitle(sep->se_service, s);
- while ((errno = 0, read(s, buffer, sizeof(buffer)) > 0) ||
- errno == EINTR)
- ;
- exit(0);
+#if BB_MMU
+ while (safe_read(s, line, LINE_SIZE) > 0)
+ continue;
+#else
+ /* We are after vfork here! */
+ /* move network socket to stdin */
+ xmove_fd(s, STDIN_FILENO);
+ /* discard output */
+ close(STDOUT_FILENO);
+ xopen("/dev/null", O_WRONLY);
+ /* no error messages please... */
+ xdup2(STDOUT_FILENO, STDERR_FILENO);
+ BB_EXECVP("cat", (char**)cat_args);
+ /* on failure we return to main, which does exit(EXIT_FAILURE) */
+#endif
}
-
-/* Discard service -- ignore data */
-static void discard_dg(int s, struct servtab *sep)
+/* ARGSUSED */
+static void discard_dg(int s, servtab_t *sep ATTRIBUTE_UNUSED)
{
- char buffer[BUFSIZE];
- (void)sep;
- read(s, buffer, sizeof(buffer));
+ /* dgram builtins are non-forking - DONT BLOCK! */
+ recv(s, line, LINE_SIZE, MSG_DONTWAIT);
}
-#endif /* CONFIG_FEATURE_INETD_SUPPORT_BILTIN_DISCARD */
+#endif /* FEATURE_INETD_SUPPORT_BUILTIN_DISCARD */
-#ifdef CONFIG_FEATURE_INETD_SUPPORT_BILTIN_CHARGEN
-#include <ctype.h>
+#if ENABLE_FEATURE_INETD_SUPPORT_BUILTIN_CHARGEN
#define LINESIZ 72
-static char ring[128];
-static char *endring;
-
-static void initring(void)
+static void init_ring(void)
{
int i;
- endring = ring;
-
+ end_ring = ring;
for (i = 0; i <= 128; ++i)
if (isprint(i))
- *endring++ = i;
+ *end_ring++ = i;
}
-
-/* Character generator */
-static void chargen_stream(int s, struct servtab *sep)
+/* Character generator. MMU arches only. */
+/* ARGSUSED */
+static void chargen_stream(int s, servtab_t *sep ATTRIBUTE_UNUSED)
{
char *rs;
int len;
- char text[LINESIZ+2];
+ char text[LINESIZ + 2];
- setproctitle(sep->se_service, s);
-
- if (!endring) {
- initring();
+ if (!end_ring) {
+ init_ring();
rs = ring;
}
text[LINESIZ] = '\r';
text[LINESIZ + 1] = '\n';
- for (rs = ring;;) {
- if ((len = endring - rs) >= LINESIZ)
- memcpy(rs, text, LINESIZ);
+ rs = ring;
+ for (;;) {
+ len = end_ring - rs;
+ if (len >= LINESIZ)
+ memmove(text, rs, LINESIZ);
else {
- memcpy(rs, text, len);
- memcpy(ring, text + len, LINESIZ - len);
+ memmove(text, rs, len);
+ memmove(text + len, ring, LINESIZ - len);
}
- if (++rs == endring)
+ if (++rs == end_ring)
rs = ring;
- if (write(s, text, sizeof(text)) != sizeof(text))
- break;
+ xwrite(s, text, sizeof(text));
}
- exit(0);
}
-
-/* Character generator */
-static void chargen_dg(int s, struct servtab *sep)
+/* ARGSUSED */
+static void chargen_dg(int s, servtab_t *sep)
{
- struct sockaddr sa;
- static char *rs;
- size_t len, size;
- char text[LINESIZ+2];
+ int len;
+ char text[LINESIZ + 2];
+ len_and_sockaddr *lsa = alloca(LSA_LEN_SIZE + sep->se_lsa->len);
- (void)sep;
+ /* Eat UDP packet which started it all */
+ /* dgram builtins are non-forking - DONT BLOCK! */
+ lsa->len = sep->se_lsa->len;
+ if (recvfrom(s, text, sizeof(text), MSG_DONTWAIT, &lsa->u.sa, &lsa->len) < 0)
+ return;
- if (endring == 0) {
- initring();
- rs = ring;
+ if (!end_ring) {
+ init_ring();
+ ring_pos = ring;
}
- size = sizeof(sa);
- if (recvfrom(s, text, sizeof(text), 0, &sa, &size) < 0)
- return;
-
- if ((len = endring - rs) >= LINESIZ)
- memcpy(rs, text, LINESIZ);
+ len = end_ring - ring_pos;
+ if (len >= LINESIZ)
+ memmove(text, ring_pos, LINESIZ);
else {
- memcpy(rs, text, len);
- memcpy(ring, text + len, LINESIZ - len);
+ memmove(text, ring_pos, len);
+ memmove(text + len, ring, LINESIZ - len);
}
- if (++rs == endring)
- rs = ring;
+ if (++ring_pos == end_ring)
+ ring_pos = ring;
text[LINESIZ] = '\r';
text[LINESIZ + 1] = '\n';
- (void) sendto(s, text, sizeof(text), 0, &sa, sizeof(sa));
+ sendto(s, text, sizeof(text), 0, &lsa->u.sa, lsa->len);
}
-#endif /* CONFIG_FEATURE_INETD_SUPPORT_BILTIN_CHARGEN */
+#endif /* FEATURE_INETD_SUPPORT_BUILTIN_CHARGEN */
-#ifdef CONFIG_FEATURE_INETD_SUPPORT_BILTIN_TIME
+#if ENABLE_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
* we must add 2208988800 seconds to this figure to make up for
* some seventy years Bell Labs was asleep.
*/
-
-static long machtime(void)
+static uint32_t machtime(void)
{
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));
+ gettimeofday(&tv, NULL);
+ return htonl((uint32_t)(tv.tv_sec + 2208988800));
}
-
-static void machtime_stream(int s, struct servtab *sep)
+/* ARGSUSED */
+static void machtime_stream(int s, servtab_t *sep ATTRIBUTE_UNUSED)
{
- long result;
- (void)sep;
+ uint32_t result;
result = machtime();
- write(s, (char *) &result, sizeof(result));
+ full_write(s, &result, sizeof(result));
}
-
-static void machtime_dg(int s, struct servtab *sep)
+static void machtime_dg(int s, servtab_t *sep)
{
- long result;
- struct sockaddr sa;
- size_t size;
- (void)sep;
+ uint32_t result;
+ len_and_sockaddr *lsa = alloca(LSA_LEN_SIZE + sep->se_lsa->len);
- size = sizeof(sa);
- if (recvfrom(s, (char *)&result, sizeof(result), 0, &sa, &size) < 0)
+ lsa->len = sep->se_lsa->len;
+ if (recvfrom(s, line, LINE_SIZE, MSG_DONTWAIT, &lsa->u.sa, &lsa->len) < 0)
return;
+
result = machtime();
- (void) sendto(s, (char *) &result, sizeof(result), 0, &sa, sizeof(sa));
+ sendto(s, &result, sizeof(result), 0, &lsa->u.sa, lsa->len);
}
-#endif /* CONFIG_FEATURE_INETD_SUPPORT_BILTIN_TIME */
+#endif /* FEATURE_INETD_SUPPORT_BUILTIN_TIME */
-#ifdef CONFIG_FEATURE_INETD_SUPPORT_BILTIN_DAYTIME
+#if ENABLE_FEATURE_INETD_SUPPORT_BUILTIN_DAYTIME
/* Return human-readable time of day */
-static int human_readable_time_sprintf(char *buffer)
+/* ARGSUSED */
+static void daytime_stream(int s, servtab_t *sep ATTRIBUTE_UNUSED)
{
- time_t clocc = time(NULL);
+ time_t t;
- return sprintf(buffer, "%.24s\r\n", ctime(&clocc));
+ t = time(NULL);
+ fdprintf(s, "%.24s\r\n", ctime(&t));
}
-
-static void daytime_stream(int s, struct servtab *sep)
+static void daytime_dg(int s, servtab_t *sep)
{
- char buffer[256];
- size_t st = human_readable_time_sprintf(buffer);
-
- (void)sep;
+ time_t t;
+ len_and_sockaddr *lsa = alloca(LSA_LEN_SIZE + sep->se_lsa->len);
- write(s, buffer, st);
-}
-
-/* Return human-readable time of day */
-static void daytime_dg(int s, struct servtab *sep)
-{
- char buffer[256];
- struct sockaddr sa;
- size_t size;
-
- (void)sep;
-
- size = sizeof(sa);
- if (recvfrom(s, buffer, sizeof(buffer), 0, &sa, &size) < 0)
+ lsa->len = sep->se_lsa->len;
+ if (recvfrom(s, line, LINE_SIZE, MSG_DONTWAIT, &lsa->u.sa, &lsa->len) < 0)
return;
- size = human_readable_time_sprintf(buffer);
- sendto(s, buffer, size, 0, &sa, sizeof(sa));
+
+ t = time(NULL);
+ sprintf(line, "%.24s\r\n", ctime(&t));
+ sendto(s, line, strlen(line), 0, &lsa->u.sa, lsa->len);
}
-#endif /* CONFIG_FEATURE_INETD_SUPPORT_BILTIN_DAYTIME */
+#endif /* FEATURE_INETD_SUPPORT_BUILTIN_DAYTIME */
projects / oweals / busybox.git / blobdiff