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-rw-r--r--i/pc104/initrd/conf/busybox/networking/inetd.c1791
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diff --git a/i/pc104/initrd/conf/busybox/networking/inetd.c b/i/pc104/initrd/conf/busybox/networking/inetd.c
new file mode 100644
index 0000000..c037d11
--- /dev/null
+++ b/i/pc104/initrd/conf/busybox/networking/inetd.c
@@ -0,0 +1,1791 @@
+/* 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.
+ */
+
+/* inetd rules for passing file descriptors to children
+ * (http://www.freebsd.org/cgi/man.cgi?query=inetd):
+ *
+ * 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.
+ *
+ * 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.
+ */
+
+/* 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>
+#include <sys/un.h>
+
+//#define ENABLE_FEATURE_INETD_RPC 1
+//#define ENABLE_FEATURE_INETD_SUPPORT_BUILTIN_ECHO 1
+//#define ENABLE_FEATURE_INETD_SUPPORT_BUILTIN_DISCARD 1
+//#define ENABLE_FEATURE_INETD_SUPPORT_BUILTIN_TIME 1
+//#define ENABLE_FEATURE_INETD_SUPPORT_BUILTIN_DAYTIME 1
+//#define ENABLE_FEATURE_INETD_SUPPORT_BUILTIN_CHARGEN 1
+//#define ENABLE_FEATURE_IPV6 1
+
+#if ENABLE_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 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 ENABLE_FEATURE_INETD_SUPPORT_BUILTIN_ECHO || \
+ ENABLE_FEATURE_INETD_SUPPORT_BUILTIN_DISCARD || \
+ ENABLE_FEATURE_INETD_SUPPORT_BUILTIN_TIME || \
+ ENABLE_FEATURE_INETD_SUPPORT_BUILTIN_DAYTIME || \
+ ENABLE_FEATURE_INETD_SUPPORT_BUILTIN_CHARGEN
+# define INETD_FEATURE_ENABLED
+#endif
+
+#if ENABLE_FEATURE_INETD_SUPPORT_BUILTIN_ECHO || \
+ ENABLE_FEATURE_INETD_SUPPORT_BUILTIN_DISCARD || \
+ ENABLE_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 */
+#if ENABLE_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;
+#if ENABLE_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 */
+#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 */
+#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 */
+#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 */
+#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 */
+#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 builtin builtins[] = {
+#if ENABLE_FEATURE_INETD_SUPPORT_BUILTIN_ECHO
+ /* Echo received data */
+ {"echo", SOCK_STREAM, 1, 0, echo_stream,},
+ {"echo", SOCK_DGRAM, 0, 0, echo_dg,},
+#endif
+#if ENABLE_FEATURE_INETD_SUPPORT_BUILTIN_DISCARD
+ /* Internet /dev/null */
+ {"discard", SOCK_STREAM, 1, 0, discard_stream,},
+ {"discard", SOCK_DGRAM, 0, 0, discard_dg,},
+#endif
+#if ENABLE_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
+#if ENABLE_FEATURE_INETD_SUPPORT_BUILTIN_DAYTIME
+ /* Return human-readable time */
+ {"daytime", SOCK_STREAM, 0, 0, daytime_stream,},
+ {"daytime", SOCK_DGRAM, 0, 0, daytime_dg,},
+#endif
+#if ENABLE_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;
+static int timingout;
+static struct servent *sp;
+static uid_t uid;
+
+static const char *CONFIG = _PATH_INETDCONF;
+
+static FILE *fconfig;
+static char line[1024];
+static char *defhost;
+
+/* xstrdup(NULL) returns NULL, but this one
+ * will return newly-allocated "" if called with NULL arg
+ * TODO: audit whether this makes any real difference
+ */
+static char *xxstrdup(char *cp)
+{
+ return xstrdup(cp ? cp : "");
+}
+
+static int setconfig(void)
+{
+ free(defhost);
+ defhost = xstrdup("*");
+ 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;
+}
+
+#if ENABLE_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) {
+ bb_perror_msg("%s: getproto", sep->se_proto);
+ return;
+ }
+ size = sizeof ir_sin;
+ if (getsockname(sep->se_fd, (struct sockaddr *) &ir_sin, &size) < 0) {
+ bb_perror_msg("%s/%s: getsockname",
+ 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)))
+ bb_perror_msg("%s %s: pmap_set: %u %u %u %u",
+ 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))
+ bb_error_msg("pmap_unset(%u, %u)", sep->se_rpcprog, n);
+ }
+}
+#endif /* 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) {
+ bb_perror_msg("getrlimit");
+ 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) {
+ bb_error_msg("bump_nofile: cannot extend file limit, max = %d",
+ (int) rl.rlim_cur);
+ return -1;
+ }
+
+ if (setrlimit(RLIMIT_NOFILE, &rl) < 0) {
+ bb_perror_msg("setrlimit");
+ return -1;
+ }
+
+ rlim_ofile_cur = rl.rlim_cur;
+ return 0;
+}
+
+static void setup(servtab_t *sep)
+{
+ int r;
+
+ sep->se_fd = socket(sep->se_family, sep->se_socktype, 0);
+ if (sep->se_fd < 0) {
+ bb_perror_msg("%s/%s: socket", sep->se_service, sep->se_proto);
+ return;
+ }
+ if (setsockopt_reuseaddr(sep->se_fd) < 0)
+ bb_perror_msg("setsockopt(SO_REUSEADDR)");
+
+#if ENABLE_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) {
+ bb_perror_msg("%s/%s (%d): bind",
+ 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) */
+ /* bb_error_msg("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)
+{
+ return xmalloc(sizeof(servtab_t));
+}
+
+static servtab_t *dupconfig(servtab_t *sep)
+{
+ servtab_t *newtab;
+ int argc;
+
+ newtab = new_servtab();
+ memset(newtab, 0, sizeof(servtab_t));
+ newtab->se_service = xstrdup(sep->se_service);
+ newtab->se_socktype = sep->se_socktype;
+ newtab->se_family = sep->se_family;
+ newtab->se_proto = xstrdup(sep->se_proto);
+#if ENABLE_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 = xstrdup(sep->se_user);
+ newtab->se_group = xstrdup(sep->se_group);
+#ifdef INETD_FEATURE_ENABLED
+ newtab->se_bi = sep->se_bi;
+#endif
+ newtab->se_server = xstrdup(sep->se_server);
+
+ for (argc = 0; argc <= MAXARGV; argc++)
+ newtab->se_argv[argc] = xstrdup(sep->se_argv[argc]);
+ 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 == '#') /* skip comment line */;
+ 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 = xstrdup(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 = xxstrdup(defhost);
+
+ sep->se_service = xxstrdup(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 = xxstrdup(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')
+#if ENABLE_FEATURE_IPV6
+ sep->se_family = AF_INET6;
+#else
+ bb_error_msg("%s: IPV6 not supported", sep->se_proto);
+#endif
+ if (strncmp(sep->se_proto, "rpc/", 4) == 0) {
+#if ENABLE_FEATURE_INETD_RPC
+ char *p, *ccp;
+ long l;
+
+ p = strchr(sep->se_service, '/');
+ if (p == 0) {
+ bb_error_msg("%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:
+ bb_error_msg("%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
+ bb_error_msg("%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 = xatoi(s);
+ } else
+ sep->se_max = toomany;
+ }
+ sep->se_wait = strcmp(arg, "wait") == 0;
+ /* if ((arg = skip(&cp, 1)) == NULL) */
+ /* goto more; */
+ sep->se_user = xxstrdup(skip(&cp));
+ arg = strchr(sep->se_user, '.');
+ if (arg == NULL)
+ arg = strchr(sep->se_user, ':');
+ if (arg) {
+ *arg++ = '\0';
+ sep->se_group = xstrdup(arg);
+ }
+ /* if ((arg = skip(&cp, 1)) == NULL) */
+ /* goto more; */
+
+ sep->se_server = xxstrdup(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) {
+ bb_error_msg("internal service %s unknown", sep->se_service);
+ goto more;
+ }
+ sep->se_bi = bi;
+ sep->se_wait = bi->bi_wait;
+#else
+ bb_perror_msg("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++] = xxstrdup(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 = xstrdup(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 (LONE_CHAR(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) {
+ bb_error_msg("%s: unknown host", nsep->se_hostaddr);
+ nsep->se_checked = 0;
+ goto skip;
+ } else if (hp->h_addrtype != AF_INET) {
+ bb_error_msg("%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 = xxstrdup(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;
+#if ENABLE_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;
+
+#if ENABLE_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;
+ size_t n;
+ char protoname[10];
+
+ if (!setconfig()) {
+ bb_perror_msg("%s", CONFIG);
+ return;
+ }
+ for (sep = servtab; sep; sep = sep->se_next)
+ sep->se_checked = 0;
+ cp = getconfigent();
+ while (cp != NULL) {
+ for (sep = servtab; sep; sep = sep->se_next)
+ if (matchconf(sep, cp))
+ break;
+
+ if (sep != 0) {
+ int i;
+
+#define SWAP(type, a, b) 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
+
+#if ENABLE_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);
+ } 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;
+
+#if ENABLE_FEATURE_INETD_RPC
+ if (isrpcservice(sep)) {
+ struct rpcent *rp;
+ // FIXME: atoi_or_else(str, 0) would be handy here
+ sep->se_rpcprog = atoi(sep->se_service);
+ if (sep->se_rpcprog == 0) {
+ rp = getrpcbyname(sep->se_service);
+ if (rp == 0) {
+ bb_error_msg("%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
+ {
+ uint16_t port = htons(atoi(sep->se_service));
+ // FIXME: atoi_or_else(str, 0) would be handy here
+ 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) {
+ bb_error_msg("%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;
+#if ENABLE_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;
+
+#if ENABLE_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) {
+ bb_error_msg("%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
+ {
+ uint16_t 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) {
+ bb_error_msg("%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 /* 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);
+ }
+#if ENABLE_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))
+ bb_error_msg("%s: exit status 0x%x",
+ sep->se_server, WEXITSTATUS(status));
+ else if (WIFSIGNALED(status))
+ bb_error_msg("%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:
+#if ENABLE_FEATURE_IPV6
+ case AF_INET6:
+#endif
+ setup(sep);
+#if ENABLE_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:
+#if ENABLE_FEATURE_IPV6
+ case AF_INET6:
+#endif
+#if ENABLE_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[]);
+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
+
+ opt = getopt32(argc, argv, "R:f", &stoomany);
+ if(opt & 1) {
+ toomany = xatoi_u(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");
+
+#ifdef BB_NOMMU
+ if (!(opt & 2)) {
+ /* reexec for vfork() do continue parent */
+ vfork_daemon_rexec(0, 0, argc, argv, "-f");
+ }
+ bb_sanitize_stdio();
+#else
+ bb_sanitize_stdio_maybe_daemonize(!(opt & 2));
+#endif
+ openlog(applet_name, LOG_PID | LOG_NOWAIT, LOG_DAEMON);
+ logmode = LOGMODE_SYSLOG;
+
+ if (uid == 0) {
+ /* If run by hand, ensure groups vector gets trashed */
+ gid_t gid = getgid();
+ setgroups(1, &gid);
+ }
+
+ {
+ FILE *fp = fopen(_PATH_INETDPID, "w");
+ if (fp != NULL) {
+ fprintf(fp, "%u\n", getpid());
+ fclose(fp);
+ }
+ }
+
+ if (getrlimit(RLIMIT_NOFILE, &rlim_ofile) < 0) {
+ bb_perror_msg("getrlimit");
+ } 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);
+ 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;
+ n = select(maxsock + 1, &readable, NULL, NULL, NULL);
+ if (n <= 0) {
+ if (n < 0 && errno != EINTR) {
+ bb_perror_msg("select");
+ sleep(1);
+ }
+ continue;
+ }
+
+ for (sep = servtab; n && sep; sep = sep->se_next) {
+ if (sep->se_fd == -1 || !FD_ISSET(sep->se_fd, &readable))
+ continue;
+
+ n--;
+ if (!sep->se_wait && sep->se_socktype == SOCK_STREAM) {
+ ctrl = accept(sep->se_fd, NULL, NULL);
+ if (ctrl < 0) {
+ if (errno == EINTR)
+ continue;
+ bb_perror_msg("accept (for %s)", 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) {
+ bb_error_msg("cannot 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;
+ }
+ bb_error_msg("%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) {
+ bb_perror_msg("fork");
+ 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
+ {
+ pwd = getpwnam(sep->se_user);
+ if (pwd == NULL) {
+ bb_error_msg("getpwnam: %s: no such user", sep->se_user);
+ goto do_exit1;
+ }
+ if (setsid() < 0)
+ bb_perror_msg("%s: setsid", sep->se_service);
+ if (sep->se_group && (grp = getgrnam(sep->se_group)) == NULL) {
+ bb_error_msg("getgrnam: %s: no such group", sep->se_group);
+ goto do_exit1;
+ }
+ 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);
+ if (ctrl) close(ctrl);
+ dup2(0, 1);
+ dup2(0, 2);
+ if (rlim_ofile.rlim_cur != rlim_ofile_cur)
+ if (setrlimit(RLIMIT_NOFILE, &rlim_ofile) < 0)
+ bb_perror_msg("setrlimit");
+ closelog();
+ for (tmpint = rlim_ofile_cur - 1; --tmpint > 2;)
+ (void) close(tmpint);
+ sigaction(SIGPIPE, &sapipe, NULL);
+ execv(sep->se_server, sep->se_argv);
+ bb_perror_msg("execv %s", sep->se_server);
+do_exit1:
+ if (sep->se_socktype != SOCK_STREAM)
+ recv(0, buf, sizeof(buf), 0);
+ _exit(1);
+ }
+ }
+ if (!sep->se_wait && sep->se_socktype == SOCK_STREAM)
+ close(ctrl);
+ } /* for (sep = servtab...) */
+ } /* for (;;) */
+}
+
+/*
+ * Internet services provided internally by inetd:
+ */
+#define BUFSIZE 4096
+
+#if ENABLE_FEATURE_INETD_SUPPORT_BUILTIN_ECHO || \
+ ENABLE_FEATURE_INETD_SUPPORT_BUILTIN_CHARGEN || \
+ ENABLE_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
+
+#if ENABLE_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 (1) {
+ i = read(s, buffer, sizeof(buffer));
+ if (i <= 0) break;
+ /* FIXME: this isnt correct - safe_write()? */
+ if (write(s, buffer, i) <= 0) break;
+ }
+ 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);
+ i = recvfrom(s, buffer, sizeof(buffer), 0, &sa, &size);
+ if (i < 0)
+ return;
+ if (dg_badinput((struct sockaddr_in *) &sa))
+ return;
+ (void) sendto(s, buffer, i, 0, &sa, sizeof(sa));
+}
+#endif /* FEATURE_INETD_SUPPORT_BUILTIN_ECHO */
+
+#if ENABLE_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 (1) {
+ errno = 0;
+ if (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 /* FEATURE_INETD_SUPPORT_BUILTIN_DISCARD */
+
+
+#if ENABLE_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';
+ rs = ring;
+ for (;;) {
+ len = endring - rs;
+ if (len >= 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 /* FEATURE_INETD_SUPPORT_BUILTIN_CHARGEN */
+
+
+#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
+ * 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 unsigned machtime(void)
+{
+ struct timeval tv;
+
+ if (gettimeofday(&tv, NULL) < 0) {
+ fprintf(stderr, "Unable to get time of day\n");
+ return 0L;
+ }
+ return htonl((unsigned) tv.tv_sec + 2208988800UL);
+}
+
+/* ARGSUSED */
+static void
+machtime_stream(int s, servtab_t *sep ATTRIBUTE_UNUSED)
+{
+ unsigned result;
+
+ result = machtime();
+ (void) write(s, (char *) &result, sizeof(result));
+}
+
+/* ARGSUSED */
+static void
+machtime_dg(int s, servtab_t *sep ATTRIBUTE_UNUSED)
+{
+ unsigned 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 /* FEATURE_INETD_SUPPORT_BUILTIN_TIME */
+
+
+#if ENABLE_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[32];
+ time_t t;
+
+ t = time(NULL);
+
+// fdprintf instead?
+ (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(NULL);
+
+ 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 /* FEATURE_INETD_SUPPORT_BUILTIN_DAYTIME */