| /* |
| * Licensed to the Apache Software Foundation (ASF) under one |
| * or more contributor license agreements. See the NOTICE file |
| * distributed with this work for additional information |
| * regarding copyright ownership. The ASF licenses this file |
| * to you under the Apache License, Version 2.0 (the |
| * "License"); you may not use this file except in compliance |
| * with the License. You may obtain a copy of the License at |
| * |
| * http://www.apache.org/licenses/LICENSE-2.0 |
| * |
| * Unless required by applicable law or agreed to in writing, |
| * software distributed under the License is distributed on an |
| * "AS IS" BASIS, WITHOUT WARRANTIES OR CONDITIONS OF ANY |
| * KIND, either express or implied. See the License for the |
| * specific language governing permissions and limitations |
| * under the License. |
| */ |
| package org.apache.sshd.common.channel; |
| |
| import java.io.ByteArrayOutputStream; |
| import java.io.IOException; |
| import java.io.InputStream; |
| import java.io.OutputStream; |
| import java.util.Map; |
| import java.util.StringTokenizer; |
| import java.util.TreeMap; |
| import java.util.concurrent.atomic.AtomicLong; |
| import java.util.concurrent.atomic.AtomicReference; |
| |
| /** |
| * Support for stty command on unix |
| * |
| * @author <a href="mailto:dev@mina.apache.org">Apache MINA SSHD Project</a> |
| */ |
| public final class SttySupport { |
| public static final int DEFAULT_TERMINAL_WIDTH = 80; |
| public static final int DEFAULT_TERMINAL_HEIGHT = 24; |
| |
| public static final String SSHD_STTY_COMMAND_PROP = "sshd.sttyCommand"; |
| public static final String DEFAULT_SSHD_STTY_COMMAND = "stty"; |
| |
| private static final AtomicReference<String> STTY_COMMAND_HOLDER = |
| new AtomicReference<String>(System.getProperty(SSHD_STTY_COMMAND_PROP, DEFAULT_SSHD_STTY_COMMAND)); |
| private static final AtomicReference<String> TTY_PROPS_HOLDER = new AtomicReference<String>(null); |
| private static final AtomicLong TTY_PROPS_LAST_FETCHED_HOLDER = new AtomicLong(0L); |
| |
| private SttySupport() { |
| throw new UnsupportedOperationException("No instance allowed"); |
| } |
| |
| public static Map<PtyMode, Integer> getUnixPtyModes() throws IOException, InterruptedException { |
| return parsePtyModes(getTtyProps()); |
| } |
| |
| public static Map<PtyMode, Integer> parsePtyModes(String stty) { |
| Map<PtyMode, Integer> modes = new TreeMap<PtyMode, Integer>(); |
| for (PtyMode mode : PtyMode.values()) { |
| if (mode == PtyMode.TTY_OP_ISPEED || mode == PtyMode.TTY_OP_OSPEED) { |
| // TODO ... |
| } else { |
| String str = mode.name().toLowerCase(); |
| // Are we looking for a character? |
| if (str.charAt(0) == 'v') { |
| str = str.substring(1); |
| int v = findChar(stty, str); |
| if (v < 0 && "reprint".equals(str)) { |
| v = findChar(stty, "rprnt"); |
| } |
| if (v >= 0) { |
| modes.put(mode, v); |
| } |
| } else { |
| int v = findFlag(stty, str); |
| if (v >= 0) { |
| modes.put(mode, v); |
| } |
| } |
| } |
| } |
| return modes; |
| } |
| |
| private static int findFlag(String stty, String name) { |
| int cur = 0; |
| while (cur < stty.length()) { |
| int idx1 = stty.indexOf(name, cur); |
| int idx2 = idx1 + name.length(); |
| if (idx1 < 0) { |
| return -1; |
| } |
| if (idx1 > 0 && Character.isLetterOrDigit(stty.charAt(idx1 - 1)) |
| || (idx2 < stty.length() && Character.isLetterOrDigit(stty.charAt(idx2)))) { |
| cur = idx2; |
| continue; |
| } |
| return idx1 == 0 ? 1 : stty.charAt(idx1 - 1) == '-' ? 0 : 1; |
| } |
| return -1; |
| } |
| |
| private static int findChar(String stty, String name) { |
| int cur = 0; |
| while (cur < stty.length()) { |
| int idx1 = stty.indexOf(name, cur); |
| int idx2 = stty.indexOf('=', idx1); |
| int idx3 = stty.indexOf(';', idx1); |
| if (idx1 < 0 || idx2 < 0 || idx3 < idx2) { |
| // Invalid syntax |
| return -1; |
| } |
| if (idx1 > 0 && Character.isLetterOrDigit(stty.charAt(idx1 - 1)) |
| || (idx2 < stty.length() && Character.isLetterOrDigit(stty.charAt(idx2)))) { |
| cur = idx1 + name.length(); |
| continue; |
| } |
| String val = stty.substring(idx2 + 1, idx3 < 0 ? stty.length() : idx3).trim(); |
| if (val.contains("undef")) { |
| return -1; |
| } |
| if (val.length() == 2 && val.charAt(0) == '^') { |
| int v = (val.charAt(1) - 'A' + 129) % 128; |
| return v; |
| } else { |
| try { |
| return Integer.parseInt(val); |
| } catch (NumberFormatException e) { |
| // what else ? |
| } |
| } |
| return -1; |
| } |
| return -1; |
| } |
| |
| /** |
| * <P>Returns the value of "stty size" width param.</P> |
| * |
| * <P> |
| * <strong>Note</strong>: this method caches the value from the |
| * first time it is called in order to increase speed, which means |
| * that changing to size of the terminal will not be reflected |
| * in the console. |
| * </P> |
| * |
| * @return The terminal width |
| */ |
| public static int getTerminalWidth() { |
| try { |
| int val = getTerminalProperty("columns"); |
| if (val == -1) { |
| val = DEFAULT_TERMINAL_WIDTH; |
| } |
| |
| return val; |
| } catch (Exception e) { |
| return DEFAULT_TERMINAL_WIDTH; // debug breakpoint |
| } |
| } |
| |
| /** |
| * <P>Returns the value of "stty size" height param.</P> |
| * |
| * <P> |
| * <strong>Note</strong>: this method caches the value from the |
| * first time it is called in order to increase speed, which means |
| * that changing to size of the terminal will not be reflected |
| * in the console. |
| * </P> |
| * |
| * @return The terminal height |
| */ |
| public static int getTerminalHeight() { |
| try { |
| int val = getTerminalProperty("rows"); |
| if (val == -1) { |
| val = DEFAULT_TERMINAL_HEIGHT; |
| } |
| |
| return val; |
| } catch (Exception e) { |
| return DEFAULT_TERMINAL_HEIGHT; // debug breakpoint |
| } |
| } |
| |
| private static int getTerminalProperty(String prop) |
| throws IOException, InterruptedException { |
| // need to be able handle both output formats: |
| // speed 9600 baud; 24 rows; 140 columns; |
| // and: |
| // speed 38400 baud; rows = 49; columns = 111; ypixels = 0; xpixels = 0; |
| for (StringTokenizer tok = new StringTokenizer(getTtyProps(), ";\n"); tok.hasMoreTokens();) { |
| String str = tok.nextToken().trim(); |
| |
| if (str.startsWith(prop)) { |
| int index = str.lastIndexOf(" "); |
| |
| return Integer.parseInt(str.substring(index).trim()); |
| } else if (str.endsWith(prop)) { |
| int index = str.indexOf(" "); |
| |
| return Integer.parseInt(str.substring(0, index).trim()); |
| } |
| } |
| |
| return -1; |
| } |
| |
| public static String getTtyProps() throws IOException, InterruptedException { |
| // tty properties are cached so we don't have to worry too much about getting term widht/height |
| long now = System.currentTimeMillis(); |
| long lastFetched = TTY_PROPS_LAST_FETCHED_HOLDER.get(); |
| if ((TTY_PROPS_HOLDER.get() == null) || ((now - lastFetched) > 1000L)) { |
| TTY_PROPS_HOLDER.set(stty("-a")); |
| TTY_PROPS_LAST_FETCHED_HOLDER.set(System.currentTimeMillis()); |
| } |
| |
| return TTY_PROPS_HOLDER.get(); |
| } |
| |
| /** |
| * Execute the stty command with the specified arguments |
| * against the current active terminal. |
| * |
| * @param args The command arguments |
| * @return The execution result |
| * @throws IOException If failed to execute the command |
| * @throws InterruptedException If interrupted while awaiting command execution |
| * @see #exec(String) |
| */ |
| public static String stty(final String args) |
| throws IOException, InterruptedException { |
| return exec("stty " + args + " < /dev/tty").trim(); |
| } |
| |
| /** |
| * Execute the specified command and return the output |
| * (both stdout and stderr). |
| * |
| * @param cmd The command to execute |
| * @return The execution result |
| * @throws IOException If failed to execute the command |
| * @throws InterruptedException If interrupted while awaiting command execution |
| * @see #exec(String[]) |
| */ |
| public static String exec(final String cmd) |
| throws IOException, InterruptedException { |
| return exec(new String[] { |
| "sh", |
| "-c", |
| cmd |
| }); |
| } |
| |
| /** |
| * Execute the specified command and return the output |
| * (both stdout and stderr). |
| * |
| * @param cmd The command components |
| * @return The execution result |
| * @throws IOException If failed to execute the command |
| * @throws InterruptedException If interrupted while awaiting command execution |
| */ |
| private static String exec(final String ... cmd) |
| throws IOException, InterruptedException { |
| try (ByteArrayOutputStream bout = new ByteArrayOutputStream()) { |
| Process p = Runtime.getRuntime().exec(cmd); |
| copyStream(p.getInputStream(), bout); |
| copyStream(p.getErrorStream(), bout); |
| p.waitFor(); |
| |
| String result = new String(bout.toByteArray()); |
| return result; |
| } |
| } |
| |
| private static int copyStream(InputStream in, OutputStream bout) throws IOException { |
| int count = 0; |
| while (true) { |
| int c = in.read(); |
| if (c == (-1)) { |
| return count; |
| } |
| |
| bout.write(c); |
| count++; |
| } |
| } |
| |
| /** |
| * @return The command to use to set the terminal options. |
| * @see #setSttyCommand(String) |
| */ |
| public static String getSttyCommand() { |
| return STTY_COMMAND_HOLDER.get(); |
| } |
| |
| /** |
| * @param cmd The command to use to set the terminal options. Defaults |
| * to {@link #DEFAULT_SSHD_STTY_COMMAND}, or the value of the |
| * {@link #SSHD_STTY_COMMAND_PROP} system property if not set via this method |
| */ |
| public static void setSttyCommand(String cmd) { |
| STTY_COMMAND_HOLDER.set(cmd); |
| } |
| } |