last_patch58 from vodz:

Ok. I generate patch for include to busybox-devel my work with
    top (original author give me maintaining) and telnetd (my
    support and unofficial maintaining) applets.  Docs changes
    also: added awk, netstat, time applets to list ;)

AUTHORS

@@ -55,7 +55,8 @@ Glenn McGrath <bug1@optushome.com.au>
     ar, dpkg, dpkg-deb
 
 Vladimir Oleynik <dzo@simtreas.ru>
-    cmdedit; ports: ash, stty, traceroute; locale, various fixes
+    cmdedit; ports: ash, stty, traceroute, telnetd, top;
+    locale, various fixes
     and irreconcilable critic of everything not perfect.
 
 Bruce Perens <bruce@pixar.com>

docs/busybox_footer.pod

@@ -113,7 +113,8 @@ Glenn McGrath <bug1@netconnect.com.au>
 
 Vladimir Oleynik <dzo@simtreas.ru>
 
-    cmdedit; ports: ash, stty, traceroute; locale, various fixes
+    cmdedit; ports: ash, stty, traceroute, telnetd, top;
+    locale, various fixes
     and irreconcilable critic of everything not perfect.
 
 =for html <br>
@@ -166,4 +167,4 @@ Enrique Zanardi <ezanardi@ull.es>
 
 =cut
 
-# $Id: busybox_footer.pod,v 1.5 2001/12/18 14:06:01 andersen Exp $
+# $Id: busybox_footer.pod,v 1.6 2002/09/30 20:52:08 andersen Exp $

docs/busybox_header.pod

@@ -55,20 +55,20 @@ terse runtime description of their behavior.
 
 Currently defined functions include:
 
-   addgroup, adduser, adjtimex, ar, basename, busybox, cat,  chgrp,  chmod,
-chown, chroot, chvt, clear, cmp, cp, cpio, cut, date,  dc,  dd,  deallocvt,
-deluser, df, dirname, dmesg, dos2unix, dpkg, dpkg-deb, du, dumpkmap, dutmp,
-echo, expr, false, fbset, fdflush,  find,  free,  freeramdisk,  fsck.minix,
-getopt, getty, grep,  gunzip,  gzip,  halt,  head,  hostid,  hostname,  id,
-ifconfig,  init,  insmod,  kill,  killall,  klogd,  length,  ln,   loadacm,
-loadfont, loadkmap, logger, logname, ls, lsmod,  makedevs,  md5sum,  mkdir,
-mkfifo, mkfs.minix,  mknod,  mkswap,  mktemp,  more,  mount,  mt,  mv,  nc,
-nslookup, ping, pivot_root, poweroff, printf,  ps,  pwd,  rdate,  readlink,
-reboot, renice, reset, rm, rmdir, rmmod, route, rpm2cpio, sed, setkeycodes,
-sh, sleep, sort, stty, swapoff, swapon,  sync,  syslogd,  tail,  tar,  tee,
-telnet, test, tftp, touch, tr, true, tty, umount,  uname,  uniq,  unix2dos,
-update, uptime, usleep, uudecode,  uuencode,  watchdog,  wc,  wget,  which,
-whoami, xargs, yes, zcat, [
+   addgroup, adduser, adjtimex, ar, awk,  basename,  busybox,  cat,  chgrp,
+chmod, chown, chroot, chvt, clear,  cmp,  cp,  cpio,  cut,  date,  dc,  dd,
+deallocvt, deluser, df,  dirname,  dmesg,  dos2unix,  dpkg,  dpkg-deb,  du,
+dumpkmap,  dutmp,  echo,  expr,  false,   fbset,   fdflush,   find,   free,
+freeramdisk, fsck.minix, getopt, getty, grep,  gunzip,  gzip,  halt,  head,
+hostid, hostname, id, ifconfig, init, insmod, kill, killall, klogd, length,
+ln, loadacm, loadfont, loadkmap,  logger,  logname,  ls,  lsmod,  makedevs,
+md5sum, mkdir, mkfifo, mkfs.minix, mknod, mkswap, mktemp, more, mount,  mt,
+mv, nc, netstat, nslookup, ping, pivot_root,  poweroff,  printf,  ps,  pwd,
+rdate, readlink, reboot, renice, reset, rm, rmdir, rmmod, route,  rpm2cpio,
+sed, setkeycodes, sh, sleep, sort, stty, swapoff,  swapon,  sync,  syslogd,
+tail, tar, tee, telnet, telnetd, test, tftp, time, top,  touch,  tr,  true,
+tty, umount, uname,  uniq,  unix2dos,  update,  uptime,  usleep,  uudecode,
+uuencode, watchdog, wc, wget, which, whoami, xargs, yes, zcat, [
 
 =over 4
 

include/applets.h

@@ -464,6 +464,9 @@
 #ifdef CONFIG_TELNET
 	APPLET(telnet, telnet_main, _BB_DIR_USR_BIN, _BB_SUID_NEVER)
 #endif
+#ifdef CONFIG_TELNETD
+	APPLET(telnetd, telnetd_main, _BB_DIR_USR_SBIN, _BB_SUID_NEVER)
+#endif
 #ifdef CONFIG_TEST
 	APPLET(test, test_main, _BB_DIR_USR_BIN, _BB_SUID_NEVER)
 #endif

include/usage.h

@@ -1801,6 +1801,14 @@
 	"Telnet is used to establish interactive communication with another\n"\
 	"computer over a network using the TELNET protocol."
 
+#define telnetd_trivial_usage \
+	"[OPTION]"
+#define telnetd_full_usage \
+	"Telnetd listens for incoming TELNET connections on PORT.\n"\
+	"Options:\n" \
+	"\t-p PORT\tlisten for connections on PORT (default 23)\n"\
+	"\t-l LOGIN\texec LOGIN on connect (default /bin/sh)"
+
 #define test_trivial_usage \
 	"EXPRESSION\n  or   [ EXPRESSION ]"
 #define test_full_usage \

networking/Makefile.in

@@ -32,6 +32,7 @@ NETWORKING-$(CONFIG_PING)		+= ping.o
 NETWORKING-$(CONFIG_PING6)		+= ping6.o
 NETWORKING-$(CONFIG_ROUTE)		+= route.o
 NETWORKING-$(CONFIG_TELNET)		+= telnet.o
+NETWORKING-$(CONFIG_TELNETD)    	+= telnetd.o
 NETWORKING-$(CONFIG_TFTP)		+= tftp.o
 NETWORKING-$(CONFIG_TRACEROUTE)		+= traceroute.o
 NETWORKING-$(CONFIG_UDHCPC)		+= udhcpc.o

networking/config.in

@@ -34,6 +34,7 @@ bool 'telnet'	    CONFIG_TELNET
 if [ "$CONFIG_TELNET" = "y" ]; then
     bool '  Pass TERM type to remote host'		CONFIG_FEATURE_TELNET_TTYPE
 fi
+bool 'telnetd'      CONFIG_TELNETD
 bool 'tftp'	    CONFIG_TFTP
 if [ "$CONFIG_TFTP" = "y" ]; then
     bool '  Enable "get" command'			CONFIG_FEATURE_TFTP_GET

networking/telnetd.c

@@ -0,0 +1,538 @@
+/* $Id: telnetd.c,v 1.1 2002/09/30 20:52:04 andersen Exp $
+ *
+ * Simple telnet server
+ * Bjorn Wesen, Axis Communications AB (bjornw@axis.com)
+ *
+ * This file is distributed under the Gnu Public License (GPL),
+ * please see the file LICENSE for further information.
+ *
+ * ---------------------------------------------------------------------------
+ * (C) Copyright 2000, Axis Communications AB, LUND, SWEDEN
+ ****************************************************************************
+ *
+ * The telnetd manpage says it all:
+ *
+ *   Telnetd operates by allocating a pseudo-terminal device (see pty(4))  for
+ *   a client, then creating a login process which has the slave side of the
+ *   pseudo-terminal as stdin, stdout, and stderr. Telnetd manipulates the
+ *   master side of the pseudo-terminal, implementing the telnet protocol and
+ *   passing characters between the remote client and the login process.
+ *
+ * Vladimir Oleynik <dzo@simtreas.ru> 2001
+ *     Set process group corrections, initial busybox port
+ */
+
+/*#define DEBUG 1 */
+
+#include <sys/time.h>
+#include <sys/socket.h>
+#include <sys/wait.h>
+#include <string.h>
+#include <stdlib.h>
+#include <unistd.h>
+#include <errno.h>
+#include <netinet/in.h>
+#include <fcntl.h>
+#include <stdio.h>
+#include <signal.h>
+#include <termios.h>
+#ifdef DEBUG
+#define TELCMDS
+#define TELOPTS
+#endif
+#include <arpa/telnet.h>
+#include <ctype.h>
+#include <sys/syslog.h>
+
+#include "busybox.h"
+
+#define BUFSIZE 4000
+
+static const char *loginpath = "/bin/sh";
+
+/* shell name and arguments */
+
+static const char *argv_init[] = {NULL, NULL};
+
+/* structure that describes a session */
+
+struct tsession {
+	struct tsession *next;
+	int sockfd, ptyfd;
+	int shell_pid;
+	/* two circular buffers */
+	char *buf1, *buf2;
+	int rdidx1, wridx1, size1;
+	int rdidx2, wridx2, size2;
+};
+
+/*
+
+   This is how the buffers are used. The arrows indicate the movement
+   of data.
+
+   +-------+     wridx1++     +------+     rdidx1++     +----------+
+   |       | <--------------  | buf1 | <--------------  |          |
+   |       |     size1--      +------+     size1++      |          |
+   |  pty  |                                            |  socket  |
+   |       |     rdidx2++     +------+     wridx2++     |          |
+   |       |  --------------> | buf2 |  --------------> |          |
+   +-------+     size2++      +------+     size2--      +----------+
+
+   Each session has got two buffers.
+
+*/
+
+static int maxfd;
+
+static struct tsession *sessions;
+
+
+/*
+
+   Remove all IAC's from the buffer pointed to by bf (recieved IACs are ignored
+   and must be removed so as to not be interpreted by the terminal).  Make an
+   uninterrupted string of characters fit for the terminal.  Do this by packing
+   all characters meant for the terminal sequentially towards the end of bf.
+
+   Return a pointer to the beginning of the characters meant for the terminal.
+   and make *num_totty the number of characters that should be sent to
+   the terminal.
+
+   Note - If an IAC (3 byte quantity) starts before (bf + len) but extends
+   past (bf + len) then that IAC will be left unprocessed and *processed will be
+   less than len.
+
+   FIXME - if we mean to send 0xFF to the terminal then it will be escaped,
+   what is the escape character?  We aren't handling that situation here.
+
+  */
+static char *
+remove_iacs(struct tsession *ts, int *pnum_totty) {
+	unsigned char *ptr0 = ts->buf1 + ts->wridx1;
+	unsigned char *ptr = ptr0;
+	unsigned char *totty = ptr;
+	unsigned char *end = ptr + MIN(BUFSIZE - ts->wridx1, ts->size1);
+	int processed;
+	int num_totty;
+
+	while (ptr < end) {
+		if (*ptr != IAC) {
+			*totty++ = *ptr++;
+		}
+		else {
+			if ((ptr+2) < end) {
+			/* the entire IAC is contained in the buffer
+			we were asked to process. */
+#ifdef DEBUG
+				fprintf(stderr, "Ignoring IAC %s,%s\n",
+				    *ptr, TELCMD(*(ptr+1)), TELOPT(*(ptr+2)));
+#endif
+				ptr += 3;
+			} else {
+				/* only the beginning of the IAC is in the
+				buffer we were asked to process, we can't
+				process this char. */
+				break;
+			}
+		}
+	}
+
+	processed = ptr - ptr0;
+	num_totty = totty - ptr0;
+	/* the difference between processed and num_to tty
+	   is all the iacs we removed from the stream.
+	   Adjust buf1 accordingly. */
+	ts->wridx1 += processed - num_totty;
+	ts->size1 -= processed - num_totty;
+	*pnum_totty = num_totty;
+	/* move the chars meant for the terminal towards the end of the
+	buffer. */
+	return memmove(ptr - num_totty, ptr0, num_totty);
+}
+
+
+static int
+getpty(char *line)
+{
+	int p;
+#ifdef HAVE_DEVPTS_FS
+	p = open("/dev/ptmx", 2);
+	if (p > 0) {
+		grantpt(p);
+		unlockpt(p);
+		strcpy(line, ptsname(p));
+		return(p);
+	}
+#else
+	struct stat stb;
+	int i;
+	int j;
+
+	strcpy(line, "/dev/ptyXX");
+
+	for (i = 0; i < 16; i++) {
+		line[8] = "pqrstuvwxyzabcde"[i];
+		line[9] = '0';
+		if (stat(line, &stb) < 0) {
+			continue;
+		}
+		for (j = 0; j < 16; j++) {
+			line[9] = j < 10 ? j + '0' : j - 10 + 'a';
+			if ((p = open(line, O_RDWR | O_NOCTTY)) >= 0) {
+				line[5] = 't';
+				return p;
+			}
+		}
+	}
+#endif /* HAVE_DEVPTS_FS */
+	return -1;
+}
+
+
+static void
+send_iac(struct tsession *ts, unsigned char command, int option)
+{
+	/* We rely on that there is space in the buffer for now.  */
+	char *b = ts->buf2 + ts->rdidx2;
+	*b++ = IAC;
+	*b++ = command;
+	*b++ = option;
+	ts->rdidx2 += 3;
+	ts->size2 += 3;
+}
+
+
+static struct tsession *
+make_new_session(int sockfd)
+{
+	struct termios termbuf;
+	int pty, pid;
+	char tty_name[32];
+	struct tsession *ts = malloc(sizeof(struct tsession) + BUFSIZE * 2);
+
+	ts->buf1 = (char *)(&ts[1]);
+	ts->buf2 = ts->buf1 + BUFSIZE;
+
+	ts->sockfd = sockfd;
+
+	ts->rdidx1 = ts->wridx1 = ts->size1 = 0;
+	ts->rdidx2 = ts->wridx2 = ts->size2 = 0;
+
+	/* Got a new connection, set up a tty and spawn a shell.  */
+
+	pty = getpty(tty_name);
+
+	if (pty < 0) {
+		syslog_msg(LOG_USER, LOG_ERR, "All network ports in use!");
+		return 0;
+	}
+
+	if (pty > maxfd)
+		maxfd = pty;
+
+	ts->ptyfd = pty;
+
+	/* Make the telnet client understand we will echo characters so it
+	 * should not do it locally. We don't tell the client to run linemode,
+	 * because we want to handle line editing and tab completion and other
+	 * stuff that requires char-by-char support.
+	 */
+
+	send_iac(ts, DO, TELOPT_ECHO);
+	send_iac(ts, DO, TELOPT_LFLOW);
+	send_iac(ts, WILL, TELOPT_ECHO);
+	send_iac(ts, WILL, TELOPT_SGA);
+
+
+	if ((pid = fork()) < 0) {
+		syslog_msg(LOG_USER, LOG_ERR, "Can`t forking");
+	}
+	if (pid == 0) {
+		/* In child, open the child's side of the tty.  */
+		int i;
+
+		for(i = 0; i <= maxfd; i++)
+			close(i);
+		/* make new process group */
+		setsid();
+
+		if (open(tty_name, O_RDWR /*| O_NOCTTY*/) < 0) {
+			syslog_msg(LOG_USER, LOG_ERR, "Could not open tty");
+			exit(1);
+			}
+		dup(0);
+		dup(0);
+
+		tcsetpgrp(0, getpid());
+
+		/* The pseudo-terminal allocated to the client is configured to operate in
+		 * cooked mode, and with XTABS CRMOD enabled (see tty(4)).
+		 */
+
+		tcgetattr(0, &termbuf);
+		termbuf.c_lflag |= ECHO; /* if we use readline we dont want this */
+		termbuf.c_oflag |= ONLCR|XTABS;
+		termbuf.c_iflag |= ICRNL;
+		termbuf.c_iflag &= ~IXOFF;
+		/*termbuf.c_lflag &= ~ICANON;*/
+		tcsetattr(0, TCSANOW, &termbuf);
+
+		/* exec shell, with correct argv and env */
+		execv(loginpath, (char *const *)argv_init);
+
+		/* NOT REACHED */
+		syslog_msg(LOG_USER, LOG_ERR, "execv error");
+		exit(1);
+	}
+
+	ts->shell_pid = pid;
+
+	return ts;
+}
+
+static void
+free_session(struct tsession *ts)
+{
+	struct tsession *t = sessions;
+
+	/* Unlink this telnet session from the session list.  */
+	if(t == ts)
+		sessions = ts->next;
+	else {
+		while(t->next != ts)
+			t = t->next;
+		t->next = ts->next;
+	}
+
+	kill(ts->shell_pid, SIGKILL);
+
+	wait4(ts->shell_pid, NULL, 0, NULL);
+
+	close(ts->ptyfd);
+	close(ts->sockfd);
+
+	if(ts->ptyfd == maxfd || ts->sockfd == maxfd)
+		maxfd--;
+	if(ts->ptyfd == maxfd || ts->sockfd == maxfd)
+		maxfd--;
+
+	free(ts);
+}
+
+int
+telnetd_main(int argc, char **argv)
+{
+	struct sockaddr_in sa;
+	int master_fd;
+	fd_set rdfdset, wrfdset;
+	int selret;
+	int on = 1;
+	int portnbr = 23;
+	int c;
+
+	/* check if user supplied a port number */
+
+	for (;;) {
+		c = getopt( argc, argv, "p:l:");
+		if (c == EOF) break;
+		switch (c) {
+			case 'p':
+				portnbr = atoi(optarg);
+				break;
+			case 'l':
+				loginpath = strdup (optarg);
+				break;
+			default:
+				show_usage();
+		}
+	}
+
+	if (access(loginpath, X_OK) < 0) {
+		error_msg_and_die ("'%s' unavailable.", loginpath);
+	}
+
+	argv_init[0] = loginpath;
+	sessions = 0;
+
+	/* Grab a TCP socket.  */
+
+	master_fd = socket(AF_INET, SOCK_STREAM, 0);
+	if (master_fd < 0) {
+		perror_msg_and_die("socket");
+	}
+	(void)setsockopt(master_fd, SOL_SOCKET, SO_REUSEADDR, &on, sizeof(on));
+
+	/* Set it to listen to specified port.  */
+
+	memset((void *)&sa, 0, sizeof(sa));
+	sa.sin_family = AF_INET;
+	sa.sin_port = htons(portnbr);
+
+	if (bind(master_fd, (struct sockaddr *) &sa, sizeof(sa)) < 0) {
+		perror_msg_and_die("bind");
+	}
+
+	if (listen(master_fd, 1) < 0) {
+		perror_msg_and_die("listen");
+	}
+
+	if (daemon(0, 0) < 0)
+		perror_msg_and_die("daemon");
+
+
+	maxfd = master_fd;
+
+	do {
+		struct tsession *ts;
+
+		FD_ZERO(&rdfdset);
+		FD_ZERO(&wrfdset);
+
+		/* select on the master socket, all telnet sockets and their
+		 * ptys if there is room in their respective session buffers.
+		 */
+
+		FD_SET(master_fd, &rdfdset);
+
+		ts = sessions;
+		while (ts) {
+			/* buf1 is used from socket to pty
+			 * buf2 is used from pty to socket
+			 */
+			if (ts->size1 > 0) {
+				FD_SET(ts->ptyfd, &wrfdset);  /* can write to pty */
+			}
+			if (ts->size1 < BUFSIZE) {
+				FD_SET(ts->sockfd, &rdfdset); /* can read from socket */
+			}
+			if (ts->size2 > 0) {
+				FD_SET(ts->sockfd, &wrfdset); /* can write to socket */
+			}
+			if (ts->size2 < BUFSIZE) {
+				FD_SET(ts->ptyfd, &rdfdset);  /* can read from pty */
+			}
+			ts = ts->next;
+		}
+
+		selret = select(maxfd + 1, &rdfdset, &wrfdset, 0, 0);
+
+		if (!selret)
+			break;
+
+		/* First check for and accept new sessions.  */
+		if (FD_ISSET(master_fd, &rdfdset)) {
+			int fd, salen;
+
+			salen = sizeof(sa);
+			if ((fd = accept(master_fd, (struct sockaddr *)&sa,
+						&salen)) < 0) {
+				continue;
+			} else {
+				/* Create a new session and link it into
+					our active list.  */
+				struct tsession *new_ts = make_new_session(fd);
+				if (new_ts) {
+					new_ts->next = sessions;
+					sessions = new_ts;
+					if (fd > maxfd)
+						maxfd = fd;
+				} else {
+					close(fd);
+				}
+			}
+		}
+
+		/* Then check for data tunneling.  */
+
+		ts = sessions;
+		while (ts) { /* For all sessions...  */
+			int maxlen, w, r;
+			struct tsession *next = ts->next; /* in case we free ts. */
+
+			if (ts->size1 && FD_ISSET(ts->ptyfd, &wrfdset)) {
+				int num_totty;
+				char *ptr;
+				/* Write to pty from buffer 1.  */
+
+				ptr = remove_iacs(ts, &num_totty);
+
+				w = write(ts->ptyfd, ptr, num_totty);
+				if (w < 0) {
+					free_session(ts);
+					ts = next;
+					continue;
+				}
+				ts->wridx1 += w;
+				ts->size1 -= w;
+				if (ts->wridx1 == BUFSIZE)
+					ts->wridx1 = 0;
+			}
+
+			if (ts->size2 && FD_ISSET(ts->sockfd, &wrfdset)) {
+				/* Write to socket from buffer 2.  */
+				maxlen = MIN(BUFSIZE - ts->wridx2, ts->size2);
+				w = write(ts->sockfd, ts->buf2 + ts->wridx2, maxlen);
+				if (w < 0) {
+					free_session(ts);
+					ts = next;
+					continue;
+				}
+				ts->wridx2 += w;
+				ts->size2 -= w;
+				if (ts->wridx2 == BUFSIZE)
+					ts->wridx2 = 0;
+			}
+
+			if (ts->size1 < BUFSIZE && FD_ISSET(ts->sockfd, &rdfdset)) {
+				/* Read from socket to buffer 1. */
+				maxlen = MIN(BUFSIZE - ts->rdidx1,
+						BUFSIZE - ts->size1);
+				r = read(ts->sockfd, ts->buf1 + ts->rdidx1, maxlen);
+				if (!r || (r < 0 && errno != EINTR)) {
+					free_session(ts);
+					ts = next;
+					continue;
+				}
+				if(!*(ts->buf1 + ts->rdidx1 + r - 1)) {
+					r--;
+					if(!r)
+						continue;
+				}
+				ts->rdidx1 += r;
+				ts->size1 += r;
+				if (ts->rdidx1 == BUFSIZE)
+					ts->rdidx1 = 0;
+			}
+
+			if (ts->size2 < BUFSIZE && FD_ISSET(ts->ptyfd, &rdfdset)) {
+				/* Read from pty to buffer 2.  */
+				maxlen = MIN(BUFSIZE - ts->rdidx2,
+						BUFSIZE - ts->size2);
+				r = read(ts->ptyfd, ts->buf2 + ts->rdidx2, maxlen);
+				if (!r || (r < 0 && errno != EINTR)) {
+					free_session(ts);
+					ts = next;
+					continue;
+				}
+				ts->rdidx2 += r;
+				ts->size2 += r;
+				if (ts->rdidx2 == BUFSIZE)
+					ts->rdidx2 = 0;
+			}
+
+			if (ts->size1 == 0) {
+				ts->rdidx1 = 0;
+				ts->wridx1 = 0;
+			}
+			if (ts->size2 == 0) {
+				ts->rdidx2 = 0;
+				ts->wridx2 = 0;
+			}
+			ts = next;
+		}
+
+	} while (1);
+
+	return 0;
+}