release/4.0.0_cvs

1 files changed, 0 insertions, 651 deletions

diff --git a/crypto/openssh/serverloop.c b/crypto/openssh/serverloop.c
deleted file mode 100644
index a5ecfe97d5d7..000000000000
--- a/crypto/openssh/serverloop.c
+++ /dev/null
@@ -1,651 +0,0 @@
-/*
- * Author: Tatu Ylonen <ylo@cs.hut.fi>
- * Copyright (c) 1995 Tatu Ylonen <ylo@cs.hut.fi>, Espoo, Finland
- *                    All rights reserved
- * Created: Sun Sep 10 00:30:37 1995 ylo
- * Server main loop for handling the interactive session.
- */
-
-#include "includes.h"
-#include "xmalloc.h"
-#include "ssh.h"
-#include "packet.h"
-#include "buffer.h"
-#include "servconf.h"
-#include "pty.h"
-
-static Buffer stdin_buffer;	/* Buffer for stdin data. */
-static Buffer stdout_buffer;	/* Buffer for stdout data. */
-static Buffer stderr_buffer;	/* Buffer for stderr data. */
-static int fdin;		/* Descriptor for stdin (for writing) */
-static int fdout;		/* Descriptor for stdout (for reading);
-				   May be same number as fdin. */
-static int fderr;		/* Descriptor for stderr.  May be -1. */
-static long stdin_bytes = 0;	/* Number of bytes written to stdin. */
-static long stdout_bytes = 0;	/* Number of stdout bytes sent to client. */
-static long stderr_bytes = 0;	/* Number of stderr bytes sent to client. */
-static long fdout_bytes = 0;	/* Number of stdout bytes read from program. */
-static int stdin_eof = 0;	/* EOF message received from client. */
-static int fdout_eof = 0;	/* EOF encountered reading from fdout. */
-static int fderr_eof = 0;	/* EOF encountered readung from fderr. */
-static int connection_in;	/* Connection to client (input). */
-static int connection_out;	/* Connection to client (output). */
-static unsigned int buffer_high;/* "Soft" max buffer size. */
-static int max_fd;		/* Max file descriptor number for select(). */
-
-/*
- * This SIGCHLD kludge is used to detect when the child exits.  The server
- * will exit after that, as soon as forwarded connections have terminated.
- */
-
-static int child_pid;			/* Pid of the child. */
-static volatile int child_terminated;	/* The child has terminated. */
-static volatile int child_wait_status;	/* Status from wait(). */
-
-void 
-sigchld_handler(int sig)
-{
-	int save_errno = errno;
-	int wait_pid;
-	debug("Received SIGCHLD.");
-	wait_pid = wait((int *) &child_wait_status);
-	if (wait_pid != -1) {
-		if (wait_pid != child_pid)
-			error("Strange, got SIGCHLD and wait returned pid %d but child is %d",
-			      wait_pid, child_pid);
-		if (WIFEXITED(child_wait_status) ||
-		    WIFSIGNALED(child_wait_status))
-			child_terminated = 1;
-	}
-	signal(SIGCHLD, sigchld_handler);
-	errno = save_errno;
-}
-
-/*
- * Process any buffered packets that have been received from the client.
- */
-void 
-process_buffered_input_packets()
-{
-	int type;
-	char *data;
-	unsigned int data_len;
-	int row, col, xpixel, ypixel;
-	int payload_len;
-
-	/* Process buffered packets from the client. */
-	while ((type = packet_read_poll(&payload_len)) != SSH_MSG_NONE) {
-		switch (type) {
-		case SSH_CMSG_STDIN_DATA:
-			/* Stdin data from the client.  Append it to the buffer. */
-			/* Ignore any data if the client has closed stdin. */
-			if (fdin == -1)
-				break;
-			data = packet_get_string(&data_len);
-			packet_integrity_check(payload_len, (4 + data_len), type);
-			buffer_append(&stdin_buffer, data, data_len);
-			memset(data, 0, data_len);
-			xfree(data);
-			break;
-
-		case SSH_CMSG_EOF:
-			/*
-			 * Eof from the client.  The stdin descriptor to the
-			 * program will be closed when all buffered data has
-			 * drained.
-			 */
-			debug("EOF received for stdin.");
-			packet_integrity_check(payload_len, 0, type);
-			stdin_eof = 1;
-			break;
-
-		case SSH_CMSG_WINDOW_SIZE:
-			debug("Window change received.");
-			packet_integrity_check(payload_len, 4 * 4, type);
-			row = packet_get_int();
-			col = packet_get_int();
-			xpixel = packet_get_int();
-			ypixel = packet_get_int();
-			if (fdin != -1)
-				pty_change_window_size(fdin, row, col, xpixel, ypixel);
-			break;
-
-		case SSH_MSG_PORT_OPEN:
-			debug("Received port open request.");
-			channel_input_port_open(payload_len);
-			break;
-
-		case SSH_MSG_CHANNEL_OPEN_CONFIRMATION:
-			debug("Received channel open confirmation.");
-			packet_integrity_check(payload_len, 4 + 4, type);
-			channel_input_open_confirmation();
-			break;
-
-		case SSH_MSG_CHANNEL_OPEN_FAILURE:
-			debug("Received channel open failure.");
-			packet_integrity_check(payload_len, 4, type);
-			channel_input_open_failure();
-			break;
-
-		case SSH_MSG_CHANNEL_DATA:
-			channel_input_data(payload_len);
-			break;
-
-		case SSH_MSG_CHANNEL_CLOSE:
-			debug("Received channel close.");
-			packet_integrity_check(payload_len, 4, type);
-			channel_input_close();
-			break;
-
-		case SSH_MSG_CHANNEL_CLOSE_CONFIRMATION:
-			debug("Received channel close confirmation.");
-			packet_integrity_check(payload_len, 4, type);
-			channel_input_close_confirmation();
-			break;
-
-		default:
-			/*
-			 * In this phase, any unexpected messages cause a
-			 * protocol error.  This is to ease debugging; also,
-			 * since no confirmations are sent messages,
-			 * unprocessed unknown messages could cause strange
-			 * problems.  Any compatible protocol extensions must
-			 * be negotiated before entering the interactive
-			 * session.
-			 */
-			packet_disconnect("Protocol error during session: type %d",
-					  type);
-		}
-	}
-}
-
-/*
- * Make packets from buffered stderr data, and buffer it for sending
- * to the client.
- */
-void 
-make_packets_from_stderr_data()
-{
-	int len;
-
-	/* Send buffered stderr data to the client. */
-	while (buffer_len(&stderr_buffer) > 0 &&
-	    packet_not_very_much_data_to_write()) {
-		len = buffer_len(&stderr_buffer);
-		if (packet_is_interactive()) {
-			if (len > 512)
-				len = 512;
-		} else {
-			/* Keep the packets at reasonable size. */
-			if (len > packet_get_maxsize())
-				len = packet_get_maxsize();
-		}
-		packet_start(SSH_SMSG_STDERR_DATA);
-		packet_put_string(buffer_ptr(&stderr_buffer), len);
-		packet_send();
-		buffer_consume(&stderr_buffer, len);
-		stderr_bytes += len;
-	}
-}
-
-/*
- * Make packets from buffered stdout data, and buffer it for sending to the
- * client.
- */
-void 
-make_packets_from_stdout_data()
-{
-	int len;
-
-	/* Send buffered stdout data to the client. */
-	while (buffer_len(&stdout_buffer) > 0 &&
-	    packet_not_very_much_data_to_write()) {
-		len = buffer_len(&stdout_buffer);
-		if (packet_is_interactive()) {
-			if (len > 512)
-				len = 512;
-		} else {
-			/* Keep the packets at reasonable size. */
-			if (len > packet_get_maxsize())
-				len = packet_get_maxsize();	
-		}
-		packet_start(SSH_SMSG_STDOUT_DATA);
-		packet_put_string(buffer_ptr(&stdout_buffer), len);
-		packet_send();
-		buffer_consume(&stdout_buffer, len);
-		stdout_bytes += len;
-	}
-}
-
-/*
- * Sleep in select() until we can do something.  This will initialize the
- * select masks.  Upon return, the masks will indicate which descriptors
- * have data or can accept data.  Optionally, a maximum time can be specified
- * for the duration of the wait (0 = infinite).
- */
-void 
-wait_until_can_do_something(fd_set * readset, fd_set * writeset,
-			    unsigned int max_time_milliseconds)
-{
-	struct timeval tv, *tvp;
-	int ret;
-
-	/* When select fails we restart from here. */
-retry_select:
-
-	/* Initialize select() masks. */
-	FD_ZERO(readset);
-
-	/*
-	 * Read packets from the client unless we have too much buffered
-	 * stdin or channel data.
-	 */
-	if (buffer_len(&stdin_buffer) < 4096 &&
-	    channel_not_very_much_buffered_data())
-		FD_SET(connection_in, readset);
-
-	/*
-	 * If there is not too much data already buffered going to the
-	 * client, try to get some more data from the program.
-	 */
-	if (packet_not_very_much_data_to_write()) {
-		if (!fdout_eof)
-			FD_SET(fdout, readset);
-		if (!fderr_eof)
-			FD_SET(fderr, readset);
-	}
-	FD_ZERO(writeset);
-
-	/* Set masks for channel descriptors. */
-	channel_prepare_select(readset, writeset);
-
-	/*
-	 * If we have buffered packet data going to the client, mark that
-	 * descriptor.
-	 */
-	if (packet_have_data_to_write())
-		FD_SET(connection_out, writeset);
-
-	/* If we have buffered data, try to write some of that data to the
-	   program. */
-	if (fdin != -1 && buffer_len(&stdin_buffer) > 0)
-		FD_SET(fdin, writeset);
-
-	/* Update the maximum descriptor number if appropriate. */
-	if (channel_max_fd() > max_fd)
-		max_fd = channel_max_fd();
-
-	/*
-	 * If child has terminated and there is enough buffer space to read
-	 * from it, then read as much as is available and exit.
-	 */
-	if (child_terminated && packet_not_very_much_data_to_write())
-		if (max_time_milliseconds == 0)
-			max_time_milliseconds = 100;
-
-	if (max_time_milliseconds == 0)
-		tvp = NULL;
-	else {
-		tv.tv_sec = max_time_milliseconds / 1000;
-		tv.tv_usec = 1000 * (max_time_milliseconds % 1000);
-		tvp = &tv;
-	}
-
-	/* Wait for something to happen, or the timeout to expire. */
-	ret = select(max_fd + 1, readset, writeset, NULL, tvp);
-
-	if (ret < 0) {
-		if (errno != EINTR)
-			error("select: %.100s", strerror(errno));
-		else
-			goto retry_select;
-	}
-}
-
-/*
- * Processes input from the client and the program.  Input data is stored
- * in buffers and processed later.
- */
-void 
-process_input(fd_set * readset)
-{
-	int len;
-	char buf[16384];
-
-	/* Read and buffer any input data from the client. */
-	if (FD_ISSET(connection_in, readset)) {
-		len = read(connection_in, buf, sizeof(buf));
-		if (len == 0) {
-			verbose("Connection closed by remote host.");
-			fatal_cleanup();
-		}
-		/*
-		 * There is a kernel bug on Solaris that causes select to
-		 * sometimes wake up even though there is no data available.
-		 */
-		if (len < 0 && errno == EAGAIN)
-			len = 0;
-
-		if (len < 0) {
-			verbose("Read error from remote host: %.100s", strerror(errno));
-			fatal_cleanup();
-		}
-		/* Buffer any received data. */
-		packet_process_incoming(buf, len);
-	}
-	/* Read and buffer any available stdout data from the program. */
-	if (!fdout_eof && FD_ISSET(fdout, readset)) {
-		len = read(fdout, buf, sizeof(buf));
-		if (len <= 0)
-			fdout_eof = 1;
-		else {
-			buffer_append(&stdout_buffer, buf, len);
-			fdout_bytes += len;
-		}
-	}
-	/* Read and buffer any available stderr data from the program. */
-	if (!fderr_eof && FD_ISSET(fderr, readset)) {
-		len = read(fderr, buf, sizeof(buf));
-		if (len <= 0)
-			fderr_eof = 1;
-		else
-			buffer_append(&stderr_buffer, buf, len);
-	}
-}
-
-/*
- * Sends data from internal buffers to client program stdin.
- */
-void 
-process_output(fd_set * writeset)
-{
-	int len;
-
-	/* Write buffered data to program stdin. */
-	if (fdin != -1 && FD_ISSET(fdin, writeset)) {
-		len = write(fdin, buffer_ptr(&stdin_buffer),
-		    buffer_len(&stdin_buffer));
-		if (len <= 0) {
-#ifdef USE_PIPES
-			close(fdin);
-#else
-			if (fdout == -1)
-				close(fdin);
-			else
-				shutdown(fdin, SHUT_WR); /* We will no longer send. */
-#endif
-			fdin = -1;
-		} else {
-			/* Successful write.  Consume the data from the buffer. */
-			buffer_consume(&stdin_buffer, len);
-			/* Update the count of bytes written to the program. */
-			stdin_bytes += len;
-		}
-	}
-	/* Send any buffered packet data to the client. */
-	if (FD_ISSET(connection_out, writeset))
-		packet_write_poll();
-}
-
-/*
- * Wait until all buffered output has been sent to the client.
- * This is used when the program terminates.
- */
-void 
-drain_output()
-{
-	/* Send any buffered stdout data to the client. */
-	if (buffer_len(&stdout_buffer) > 0) {
-		packet_start(SSH_SMSG_STDOUT_DATA);
-		packet_put_string(buffer_ptr(&stdout_buffer),
-				  buffer_len(&stdout_buffer));
-		packet_send();
-		/* Update the count of sent bytes. */
-		stdout_bytes += buffer_len(&stdout_buffer);
-	}
-	/* Send any buffered stderr data to the client. */
-	if (buffer_len(&stderr_buffer) > 0) {
-		packet_start(SSH_SMSG_STDERR_DATA);
-		packet_put_string(buffer_ptr(&stderr_buffer),
-				  buffer_len(&stderr_buffer));
-		packet_send();
-		/* Update the count of sent bytes. */
-		stderr_bytes += buffer_len(&stderr_buffer);
-	}
-	/* Wait until all buffered data has been written to the client. */
-	packet_write_wait();
-}
-
-/*
- * Performs the interactive session.  This handles data transmission between
- * the client and the program.  Note that the notion of stdin, stdout, and
- * stderr in this function is sort of reversed: this function writes to
- * stdin (of the child program), and reads from stdout and stderr (of the
- * child program).
- */
-void 
-server_loop(int pid, int fdin_arg, int fdout_arg, int fderr_arg)
-{
-	int wait_status, wait_pid;	/* Status and pid returned by wait(). */
-	int waiting_termination = 0;	/* Have displayed waiting close message. */
-	unsigned int max_time_milliseconds;
-	unsigned int previous_stdout_buffer_bytes;
-	unsigned int stdout_buffer_bytes;
-	int type;
-
-	debug("Entering interactive session.");
-
-	/* Initialize the SIGCHLD kludge. */
-	child_pid = pid;
-	child_terminated = 0;
-	signal(SIGCHLD, sigchld_handler);
-
-	/* Initialize our global variables. */
-	fdin = fdin_arg;
-	fdout = fdout_arg;
-	fderr = fderr_arg;
-	connection_in = packet_get_connection_in();
-	connection_out = packet_get_connection_out();
-
-	previous_stdout_buffer_bytes = 0;
-
-	/* Set approximate I/O buffer size. */
-	if (packet_is_interactive())
-		buffer_high = 4096;
-	else
-		buffer_high = 64 * 1024;
-
-	/* Initialize max_fd to the maximum of the known file descriptors. */
-	max_fd = fdin;
-	if (fdout > max_fd)
-		max_fd = fdout;
-	if (fderr != -1 && fderr > max_fd)
-		max_fd = fderr;
-	if (connection_in > max_fd)
-		max_fd = connection_in;
-	if (connection_out > max_fd)
-		max_fd = connection_out;
-
-	/* Initialize Initialize buffers. */
-	buffer_init(&stdin_buffer);
-	buffer_init(&stdout_buffer);
-	buffer_init(&stderr_buffer);
-
-	/*
-	 * If we have no separate fderr (which is the case when we have a pty
-	 * - there we cannot make difference between data sent to stdout and
-	 * stderr), indicate that we have seen an EOF from stderr.  This way
-	 * we don\'t need to check the descriptor everywhere.
-	 */
-	if (fderr == -1)
-		fderr_eof = 1;
-
-	/* Main loop of the server for the interactive session mode. */
-	for (;;) {
-		fd_set readset, writeset;
-
-		/* Process buffered packets from the client. */
-		process_buffered_input_packets();
-
-		/*
-		 * If we have received eof, and there is no more pending
-		 * input data, cause a real eof by closing fdin.
-		 */
-		if (stdin_eof && fdin != -1 && buffer_len(&stdin_buffer) == 0) {
-#ifdef USE_PIPES
-			close(fdin);
-#else
-			if (fdout == -1)
-				close(fdin);
-			else
-				shutdown(fdin, SHUT_WR); /* We will no longer send. */
-#endif
-			fdin = -1;
-		}
-		/* Make packets from buffered stderr data to send to the client. */
-		make_packets_from_stderr_data();
-
-		/*
-		 * Make packets from buffered stdout data to send to the
-		 * client. If there is very little to send, this arranges to
-		 * not send them now, but to wait a short while to see if we
-		 * are getting more data. This is necessary, as some systems
-		 * wake up readers from a pty after each separate character.
-		 */
-		max_time_milliseconds = 0;
-		stdout_buffer_bytes = buffer_len(&stdout_buffer);
-		if (stdout_buffer_bytes != 0 && stdout_buffer_bytes < 256 &&
-		    stdout_buffer_bytes != previous_stdout_buffer_bytes) {
-			/* try again after a while */
-			max_time_milliseconds = 10;
-		} else {
-			/* Send it now. */
-			make_packets_from_stdout_data();
-		}
-		previous_stdout_buffer_bytes = buffer_len(&stdout_buffer);
-
-		/* Send channel data to the client. */
-		if (packet_not_very_much_data_to_write())
-			channel_output_poll();
-
-		/*
-		 * Bail out of the loop if the program has closed its output
-		 * descriptors, and we have no more data to send to the
-		 * client, and there is no pending buffered data.
-		 */
-		if (fdout_eof && fderr_eof && !packet_have_data_to_write() &&
-		    buffer_len(&stdout_buffer) == 0 && buffer_len(&stderr_buffer) == 0) {
-			if (!channel_still_open())
-				goto quit;
-			if (!waiting_termination) {
-				const char *s = "Waiting for forwarded connections to terminate...\r\n";
-				char *cp;
-				waiting_termination = 1;
-				buffer_append(&stderr_buffer, s, strlen(s));
-
-				/* Display list of open channels. */
-				cp = channel_open_message();
-				buffer_append(&stderr_buffer, cp, strlen(cp));
-				xfree(cp);
-			}
-		}
-		/* Sleep in select() until we can do something. */
-		wait_until_can_do_something(&readset, &writeset,
-					    max_time_milliseconds);
-
-		/* Process any channel events. */
-		channel_after_select(&readset, &writeset);
-
-		/* Process input from the client and from program stdout/stderr. */
-		process_input(&readset);
-
-		/* Process output to the client and to program stdin. */
-		process_output(&writeset);
-	}
-
-quit:
-	/* Cleanup and termination code. */
-
-	/* Wait until all output has been sent to the client. */
-	drain_output();
-
-	debug("End of interactive session; stdin %ld, stdout (read %ld, sent %ld), stderr %ld bytes.",
-	      stdin_bytes, fdout_bytes, stdout_bytes, stderr_bytes);
-
-	/* Free and clear the buffers. */
-	buffer_free(&stdin_buffer);
-	buffer_free(&stdout_buffer);
-	buffer_free(&stderr_buffer);
-
-	/* Close the file descriptors. */
-	if (fdout != -1)
-		close(fdout);
-	fdout = -1;
-	fdout_eof = 1;
-	if (fderr != -1)
-		close(fderr);
-	fderr = -1;
-	fderr_eof = 1;
-	if (fdin != -1)
-		close(fdin);
-	fdin = -1;
-
-	/* Stop listening for channels; this removes unix domain sockets. */
-	channel_stop_listening();
-
-	/* Wait for the child to exit.  Get its exit status. */
-	wait_pid = wait(&wait_status);
-	if (wait_pid < 0) {
-		/*
-		 * It is possible that the wait was handled by SIGCHLD
-		 * handler.  This may result in either: this call
-		 * returning with EINTR, or: this call returning ECHILD.
-		 */
-		if (child_terminated)
-			wait_status = child_wait_status;
-		else
-			packet_disconnect("wait: %.100s", strerror(errno));
-	} else {
-		/* Check if it matches the process we forked. */
-		if (wait_pid != pid)
-			error("Strange, wait returned pid %d, expected %d",
-			       wait_pid, pid);
-	}
-
-	/* We no longer want our SIGCHLD handler to be called. */
-	signal(SIGCHLD, SIG_DFL);
-
-	/* Check if it exited normally. */
-	if (WIFEXITED(wait_status)) {
-		/* Yes, normal exit.  Get exit status and send it to the client. */
-		debug("Command exited with status %d.", WEXITSTATUS(wait_status));
-		packet_start(SSH_SMSG_EXITSTATUS);
-		packet_put_int(WEXITSTATUS(wait_status));
-		packet_send();
-		packet_write_wait();
-
-		/*
-		 * Wait for exit confirmation.  Note that there might be
-		 * other packets coming before it; however, the program has
-		 * already died so we just ignore them.  The client is
-		 * supposed to respond with the confirmation when it receives
-		 * the exit status.
-		 */
-		do {
-			int plen;
-			type = packet_read(&plen);
-		}
-		while (type != SSH_CMSG_EXIT_CONFIRMATION);
-
-		debug("Received exit confirmation.");
-		return;
-	}
-	/* Check if the program terminated due to a signal. */
-	if (WIFSIGNALED(wait_status))
-		packet_disconnect("Command terminated on signal %d.",
-				  WTERMSIG(wait_status));
-
-	/* Some weird exit cause.  Just exit. */
-	packet_disconnect("wait returned status %04x.", wait_status);
-	/* NOTREACHED */
-}