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/*
* 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.client.config.hosts;
import java.io.BufferedReader;
import java.io.File;
import java.io.IOException;
import java.io.InputStream;
import java.io.InputStreamReader;
import java.io.OutputStream;
import java.io.OutputStreamWriter;
import java.io.Reader;
import java.io.StreamCorruptedException;
import java.io.Writer;
import java.net.InetAddress;
import java.net.URL;
import java.nio.charset.StandardCharsets;
import java.nio.file.Files;
import java.nio.file.OpenOption;
import java.nio.file.Path;
import java.util.ArrayList;
import java.util.Arrays;
import java.util.Collection;
import java.util.Collections;
import java.util.List;
import java.util.Map;
import java.util.Map.Entry;
import java.util.NavigableSet;
import java.util.Objects;
import java.util.TreeMap;
import org.apache.sshd.common.SshConstants;
import org.apache.sshd.common.auth.MutableUserHolder;
import org.apache.sshd.common.config.ConfigFileReaderSupport;
import org.apache.sshd.common.config.keys.PublicKeyEntry;
import org.apache.sshd.common.util.GenericUtils;
import org.apache.sshd.common.util.MapEntryUtils;
import org.apache.sshd.common.util.OsUtils;
import org.apache.sshd.common.util.ValidateUtils;
import org.apache.sshd.common.util.io.IoUtils;
import org.apache.sshd.common.util.io.PathUtils;
import org.apache.sshd.common.util.io.input.NoCloseInputStream;
import org.apache.sshd.common.util.io.input.NoCloseReader;
import org.apache.sshd.common.util.io.output.NoCloseOutputStream;
/**
* Represents an entry in the client's configuration file as defined by the
* ssh_config configuration file format
*
* @author Apache MINA SSHD Project
* @see OpenSSH Config File
* Examples
*/
public class HostConfigEntry extends HostPatternsHolder implements MutableUserHolder {
/**
* Standard OpenSSH config file name
*/
public static final String STD_CONFIG_FILENAME = "config";
public static final String HOST_CONFIG_PROP = "Host";
public static final String MATCH_CONFIG_PROP = "Match"; // currently not handled
public static final String HOST_NAME_CONFIG_PROP = "HostName";
public static final String PORT_CONFIG_PROP = ConfigFileReaderSupport.PORT_CONFIG_PROP;
public static final String USER_CONFIG_PROP = "User";
public static final String PROXY_JUMP_CONFIG_PROP = "ProxyJump";
public static final String IDENTITY_FILE_CONFIG_PROP = "IdentityFile";
public static final String CERTIFICATE_FILE_CONFIG_PROP = "CertificateFile"; // currently not handled
/**
* Use only the identities specified in the host entry (if any)
*/
public static final String EXCLUSIVE_IDENTITIES_CONFIG_PROP = "IdentitiesOnly";
public static final boolean DEFAULT_EXCLUSIVE_IDENTITIES = false;
/**
* The IdentityAgent configuration. If not set in the {@link HostConfigEntry}, the value of this
* {@link #getProperty(String) property} is {@code null}, which means that a default SSH agent is to be used, if it
* is running. Other values defined by OpenSSH are:
*
*
* - none
* - No SHH agent is to be used at all, even if one is running.
* - SSH_AUTH_SOCK
* - The SSH agent listening on the Unix domain socket given by the environment variable {@code SSH_AUTH_SOCK}
* shall be used. If the environment variable is not set, no SSH agent is used.
* - other
* - For OpenSSH, the value shall resolve to the file name of a Unix domain socket to use to connect to an SSH
* agent.
*
*/
public static final String IDENTITY_AGENT = "IdentityAgent";
/**
* A case insensitive {@link NavigableSet} of the properties that receive special handling
*/
public static final NavigableSet EXPLICIT_PROPERTIES = Collections.unmodifiableNavigableSet(
GenericUtils.asSortedSet(String.CASE_INSENSITIVE_ORDER,
HOST_CONFIG_PROP, HOST_NAME_CONFIG_PROP, PORT_CONFIG_PROP,
USER_CONFIG_PROP, IDENTITY_FILE_CONFIG_PROP, EXCLUSIVE_IDENTITIES_CONFIG_PROP));
public static final String MULTI_VALUE_SEPARATORS = " ,";
public static final char PATH_MACRO_CHAR = '%';
public static final char LOCAL_HOME_MACRO = 'd';
public static final char LOCAL_USER_MACRO = 'u';
public static final char LOCAL_HOST_MACRO = 'l';
public static final char REMOTE_HOST_MACRO = 'h';
public static final char REMOTE_USER_MACRO = 'r';
// Extra - not part of the standard
public static final char REMOTE_PORT_MACRO = 'p';
private static final class LazyDefaultConfigFileHolder {
private static final Path CONFIG_FILE = PublicKeyEntry.getDefaultKeysFolderPath().resolve(STD_CONFIG_FILENAME);
private LazyDefaultConfigFileHolder() {
throw new UnsupportedOperationException("No instance allowed");
}
}
// TODO: A better approach would be to only store "host" and the properties map. Accessors can read/write the properties map.
// TODO: Map property key to generic object. Any code that calls getProperties() would need to be updated.
protected String host;
protected String hostName;
protected int port;
protected String username;
protected String proxyJump;
protected Boolean exclusiveIdentites;
// TODO: OpenSSH ignores duplicates. Ignoring them here (via a set) would complicate keeping the map entry in sync.
protected final Collection identities = new ArrayList<>();
protected final Map properties = new TreeMap<>(String.CASE_INSENSITIVE_ORDER);
public HostConfigEntry() {
super();
}
public HostConfigEntry(String pattern, String host, int port, String username) {
this(pattern, host, port, username, null);
}
public HostConfigEntry(String pattern, String host, int port, String username, String proxyJump) {
setHost(pattern);
setHostName(host);
setPort(port);
setUsername(username);
setProxyJump(proxyJump);
}
/**
* Merges that into this via underride. That is, any value present in this entry takes precedence over the given
* entry. Only this object is modified. The given entry remains unchanged.
*
* @param that The HostConfigEntry to merge.
*/
public void collate(HostConfigEntry that) {
if (hostName == null || hostName.isEmpty()) {
hostName = that.hostName; // It doesn't matter whether that host is defined or not, since ours is not.
}
if (port <= 0) {
port = that.port;
}
if (username == null || username.isEmpty()) {
username = that.username;
}
if (proxyJump == null || proxyJump.isEmpty()) {
proxyJump = that.proxyJump;
}
if (exclusiveIdentites == null) {
exclusiveIdentites = that.exclusiveIdentites;
}
identities.addAll(that.identities);
for (Entry e : that.properties.entrySet()) {
String key = e.getKey();
String value = e.getValue();
if (properties.containsKey(key)) {
if (key.equalsIgnoreCase(IDENTITY_FILE_CONFIG_PROP) || key.equalsIgnoreCase(CERTIFICATE_FILE_CONFIG_PROP)) {
properties.put(key, properties.get(key) + "," + value);
}
// else ignore, since our value takes precedence over that
} else { // key is not present in our properties
properties.put(key, value);
}
}
}
/**
* @return The pattern(s) represented by this entry
*/
public String getHost() {
return host;
}
public void setHost(String host) {
this.host = host;
setPatterns(parsePatterns(parseConfigValue(host)));
}
public void setHost(Collection patterns) {
this.host = GenericUtils.join(ValidateUtils.checkNotNullAndNotEmpty(patterns, "No patterns"), ',');
setPatterns(parsePatterns(patterns));
}
/**
* @return The effective host name to connect to if the pattern matches
*/
public String getHostName() {
return hostName;
}
public void setHostName(String hostName) {
this.hostName = hostName;
setProperty(HOST_NAME_CONFIG_PROP, hostName);
}
/**
* @return A port override - if positive
*/
public int getPort() {
return port;
}
public void setPort(int port) {
this.port = port;
if (port <= 0) {
properties.remove(PORT_CONFIG_PROP);
} else {
setProperty(PORT_CONFIG_PROP, String.valueOf(port));
}
}
/**
* @return A username override - if not {@code null}/empty
*/
@Override
public String getUsername() {
return username;
}
@Override
public void setUsername(String username) {
this.username = username;
setProperty(USER_CONFIG_PROP, username);
}
/**
* @return the host to use as a proxy
*/
public String getProxyJump() {
return proxyJump;
}
public void setProxyJump(String proxyJump) {
this.proxyJump = proxyJump;
setProperty(PROXY_JUMP_CONFIG_PROP, proxyJump);
}
/**
* @return The current identities file paths - may be {@code null}/empty
*/
public Collection getIdentities() {
return identities;
}
/**
* @param path A {@link Path} to a file that contains an identity key - never {@code null}
*/
public void addIdentity(Path path) {
addIdentity(Objects.requireNonNull(path, "No path").toAbsolutePath().normalize().toString());
}
/**
* Adds a path to an identity file
*
* @param id The identity path to add - never {@code null}
*/
public void addIdentity(String id) {
String path = ValidateUtils.checkNotNullAndNotEmpty(id, "No identity provided");
identities.add(path);
appendPropertyValue(IDENTITY_FILE_CONFIG_PROP, id);
}
public void setIdentities(Collection identities) {
this.identities.clear();
properties.remove(IDENTITY_FILE_CONFIG_PROP);
if (identities != null) {
identities.forEach(this::addIdentity);
}
}
/**
* @return {@code true} if must use only the identities in this entry
*/
public boolean isIdentitiesOnly() {
return (exclusiveIdentites == null) ? DEFAULT_EXCLUSIVE_IDENTITIES : exclusiveIdentites;
}
public void setIdentitiesOnly(boolean identitiesOnly) {
exclusiveIdentites = identitiesOnly;
setProperty(EXCLUSIVE_IDENTITIES_CONFIG_PROP, Boolean.toString(identitiesOnly));
}
/**
* @return A {@link Map} of extra properties that have been read - may be {@code null}/empty, or even contain some
* values that have been parsed and set as members of the entry (e.g., host, port, etc.). Note:
* multi-valued keys use a comma-separated list of values
*/
public Map getProperties() {
return properties;
}
/**
* @param name Property name - never {@code null}/empty
* @return Property value or {@code null} if no such property
* @see #getProperty(String, String)
*/
public String getProperty(String name) {
return getProperty(name, null);
}
/**
* @param name Property name - never {@code null}/empty
* @param defaultValue Default value to return if no such property
* @return The property value or the default one if no such property
*/
public String getProperty(String name, String defaultValue) {
String key = ValidateUtils.checkNotNullAndNotEmpty(name, "No property name");
Map props = getProperties();
if (MapEntryUtils.isEmpty(props)) {
return defaultValue;
}
String value = props.get(key);
if (GenericUtils.isEmpty(value)) {
return defaultValue;
} else {
return value;
}
}
/**
* @param name Property name - never {@code null}/empty
* @param valsList The available values for the property
* @see #HOST_NAME_CONFIG_PROP
* @see #PORT_CONFIG_PROP
* @see #USER_CONFIG_PROP
* @see #IDENTITY_FILE_CONFIG_PROP
*/
public void processProperty(String name, Collection valsList) {
String key = ValidateUtils.checkNotNullAndNotEmpty(name, "No property name");
String joinedValue = GenericUtils.join(valsList, ',');
if (HOST_NAME_CONFIG_PROP.equalsIgnoreCase(key)) {
ValidateUtils.checkTrue(GenericUtils.size(valsList) == 1, "Multiple target hosts N/A: %s", joinedValue);
setHostName(joinedValue);
} else if (PORT_CONFIG_PROP.equalsIgnoreCase(key)) {
ValidateUtils.checkTrue(GenericUtils.size(valsList) == 1, "Multiple target ports N/A: %s", joinedValue);
int newValue = Integer.parseInt(joinedValue);
ValidateUtils.checkTrue(newValue > 0, "Bad new port value: %d", newValue);
setPort(newValue);
} else if (USER_CONFIG_PROP.equalsIgnoreCase(key)) {
ValidateUtils.checkTrue(GenericUtils.size(valsList) == 1, "Multiple target users N/A: %s", joinedValue);
setUsername(joinedValue);
} else if (IDENTITY_FILE_CONFIG_PROP.equalsIgnoreCase(key)) {
ValidateUtils.checkTrue(GenericUtils.size(valsList) > 0, "No identity files specified");
for (String id : valsList) {
addIdentity(id);
}
} else if (EXCLUSIVE_IDENTITIES_CONFIG_PROP.equalsIgnoreCase(key)) {
setIdentitiesOnly(
ConfigFileReaderSupport.parseBooleanValue(
ValidateUtils.checkNotNullAndNotEmpty(joinedValue, "No identities option value")));
} else if (PROXY_JUMP_CONFIG_PROP.equalsIgnoreCase(key)) {
setProxyJump(joinedValue);
} else if (CERTIFICATE_FILE_CONFIG_PROP.equalsIgnoreCase(key)) {
appendPropertyValue(key, joinedValue);
} else {
properties.put(key, joinedValue); // Default is to overwrite any previous value. Only identities
}
}
/**
* Appends a value using a comma to an existing one. If no previous value then same as calling
* {@link #setProperty(String, String)}.
*
* @param name Property name - never {@code null}/empty
* @param value The value to be appended - ignored if {@code null}/empty
* @return The value before appending - {@code null} if no previous value
*/
public String appendPropertyValue(String name, String value) {
String key = ValidateUtils.checkNotNullAndNotEmpty(name, "No property name");
String curVal = getProperty(key);
if (GenericUtils.isEmpty(value)) {
return curVal;
}
if (GenericUtils.isEmpty(curVal)) {
return setProperty(key, value);
}
return setProperty(key, curVal + ',' + value);
}
/**
* Sets / Replaces the property value
*
* @param name Property name - never {@code null}/empty
* @param value Property value - if {@code null}/empty then {@link #removeProperty(String)} is called
* @return The previous property value - {@code null} if no such name
*/
public String setProperty(String name, String value) {
if (GenericUtils.isEmpty(value)) {
return removeProperty(name);
}
String key = ValidateUtils.checkNotNullAndNotEmpty(name, "No property name");
return properties.put(key, value);
}
/**
* @param name Property name - never {@code null}/empty
* @return The removed property value - {@code null} if no such property name
*/
public String removeProperty(String name) {
String key = ValidateUtils.checkNotNullAndNotEmpty(name, "No property name");
Map props = getProperties();
if (MapEntryUtils.isEmpty(props)) {
return null;
} else {
return props.remove(key);
}
}
/**
* @param properties The properties to set - if {@code null} then an empty map is effectively set. Note: it
* is highly recommended to use a case insensitive key mapper.
*/
public void setProperties(Map properties) {
this.properties.clear();
if (properties != null) {
this.properties.putAll(properties);
}
}
public A append(A sb) throws IOException {
sb.append(HOST_CONFIG_PROP).append(' ').append(ValidateUtils.checkNotNullAndNotEmpty(getHost(), "No host pattern"))
.append(IoUtils.EOL);
appendNonEmptyProperty(sb, HOST_NAME_CONFIG_PROP, getHostName());
appendNonEmptyPort(sb, PORT_CONFIG_PROP, getPort());
appendNonEmptyProperty(sb, USER_CONFIG_PROP, getUsername());
appendNonEmptyValues(sb, IDENTITY_FILE_CONFIG_PROP, getIdentities());
if (exclusiveIdentites != null) {
appendNonEmptyProperty(sb, EXCLUSIVE_IDENTITIES_CONFIG_PROP,
ConfigFileReaderSupport.yesNoValueOf(exclusiveIdentites));
}
appendNonEmptyProperties(sb, getProperties());
return sb;
}
@Override
public String toString() {
return getHost() + ": " + getUsername() + "@" + getHostName() + ":" + getPort();
}
/**
* @param The {@link Appendable} type
* @param sb The target appender
* @param name The property name - never {@code null}/empty
* @param port The port value - ignored if non-positive
* @return The target appender after having appended (or not) the value
* @throws IOException If failed to append the requested data
* @see #appendNonEmptyProperty(Appendable, String, Object)
*/
public static A appendNonEmptyPort(A sb, String name, int port) throws IOException {
return appendNonEmptyProperty(sb, name, (port > 0) ? Integer.toString(port) : null);
}
/**
* Appends the extra properties - while skipping the {@link #EXPLICIT_PROPERTIES} ones
*
* @param The {@link Appendable} type
* @param sb The target appender
* @param props The {@link Map} of properties - ignored if {@code null}/empty
* @return The target appender after having appended (or not) the value
* @throws IOException If failed to append the requested data
* @see #appendNonEmptyProperty(Appendable, String, Object)
*/
public static A appendNonEmptyProperties(A sb, Map props) throws IOException {
if (MapEntryUtils.isEmpty(props)) {
return sb;
}
// Cannot use forEach because of the IOException being thrown by appendNonEmptyProperty
for (Map.Entry pe : props.entrySet()) {
String name = pe.getKey();
if (EXPLICIT_PROPERTIES.contains(name)) {
continue;
}
appendNonEmptyProperty(sb, name, pe.getValue());
}
return sb;
}
/**
* @param The {@link Appendable} type
* @param sb The target appender
* @param name The property name - never {@code null}/empty
* @param value The property value - ignored if {@code null}. Note: if the string representation of
* the value contains any commas, they are assumed to indicate a multi-valued property which is
* broken down to individual lines - one per value.
* @return The target appender after having appended (or not) the value
* @throws IOException If failed to append the requested data
* @see #appendNonEmptyValues(Appendable, String, Object...)
*/
public static A appendNonEmptyProperty(A sb, String name, Object value) throws IOException {
String s = Objects.toString(value, null);
String[] vals = GenericUtils.split(s, ',');
return appendNonEmptyValues(sb, name, (Object[]) vals);
}
/**
* @param The {@link Appendable} type
* @param sb The target appender
* @param name The property name - never {@code null}/empty
* @param values The values to be added - one per line - ignored if {@code null}/empty
* @return The target appender after having appended (or not) the value
* @throws IOException If failed to append the requested data
* @see #appendNonEmptyValues(Appendable, String, Collection)
*/
public static A appendNonEmptyValues(A sb, String name, Object... values) throws IOException {
return appendNonEmptyValues(sb, name, GenericUtils.isEmpty(values) ? Collections.emptyList() : Arrays.asList(values));
}
/**
* @param The {@link Appendable} type
* @param sb The target appender
* @param name The property name - never {@code null}/empty
* @param values The values to be added - one per line - ignored if {@code null}/empty
* @return The target appender after having appended (or not) the value
* @throws IOException If failed to append the requested data
*/
public static A appendNonEmptyValues(A sb, String name, Collection values) throws IOException {
String k = ValidateUtils.checkNotNullAndNotEmpty(name, "No property name");
if (GenericUtils.isEmpty(values)) {
return sb;
}
for (Object v : values) {
sb.append(" ").append(k).append(' ').append(Objects.toString(v)).append(IoUtils.EOL);
}
return sb;
}
/**
* Locates all the matching entries for a give host name / address
*
* @param host The host name / address - ignored if {@code null}/empty
* @param entries The {@link HostConfigEntry}-ies to scan - ignored if {@code null}/empty
* @return A {@link List} of all the matching entries
* @see #isHostMatch(String, int)
*/
public static List findMatchingEntries(String host, HostConfigEntry... entries) {
if (GenericUtils.isEmpty(host) || GenericUtils.isEmpty(entries)) {
return Collections.emptyList();
} else {
return findMatchingEntries(host, Arrays.asList(entries));
}
}
/**
* Locates all the matching entries for a give host name / address
*
* @param host The host name / address - ignored if {@code null}/empty
* @param entries The {@link HostConfigEntry}-ies to scan - ignored if {@code null}/empty
* @return A {@link List} of all the matching entries
* @see #isHostMatch(String, int)
*/
public static List findMatchingEntries(String host, Collection entries) {
if (GenericUtils.isEmpty(host) || GenericUtils.isEmpty(entries)) {
return Collections.emptyList();
}
List matches = null;
for (HostConfigEntry entry : entries) {
if (!entry.isHostMatch(host, 0 /* any port */)) {
continue; // debug breakpoint
}
if (matches == null) {
matches = new ArrayList<>(entries.size()); // in case ALL of them match
}
matches.add(entry);
}
if (matches == null) {
return Collections.emptyList();
} else {
return matches;
}
}
/**
* @param entries The entries - ignored if {@code null}/empty
* @return A {@link HostConfigEntryResolver} wrapper using the entries
*/
public static HostConfigEntryResolver toHostConfigEntryResolver(Collection entries) {
if (GenericUtils.isEmpty(entries)) {
return HostConfigEntryResolver.EMPTY;
} else {
return (host, port, lclAddress, username, proxyJump, ctx) -> {
List matches = findMatchingEntries(host, entries);
int numMatches = GenericUtils.size(matches);
if (numMatches <= 0) {
return null;
}
// Collate attributes from all matching entries.
HostConfigEntry entry = new HostConfigEntry(host, null, port, username);
for (HostConfigEntry m : matches) {
entry.collate(m);
}
// Apply standard defaults.
String temp = entry.getHostName(); // Remember that this was null above.
if (temp == null || temp.isEmpty()) {
entry.setHostName(host);
}
temp = entry.getUsername();
if (temp == null || temp.isEmpty()) {
entry.setUsername(OsUtils.getCurrentUser());
}
if (entry.getPort() < 1) {
entry.setPort(SshConstants.DEFAULT_PORT);
}
// Resolve file names
Collection identities = entry.getIdentities();
if (!GenericUtils.isEmpty(identities)) {
identities = new ArrayList<>(identities);
entry.setIdentities(Collections.emptyList());
for (String id : identities) {
entry.addIdentity(
resolveIdentityFilePath(id, entry.getHostName(), entry.getPort(), entry.getUsername()));
}
}
// Same for CertificateFile
String certificateFiles = entry.getProperty(CERTIFICATE_FILE_CONFIG_PROP);
if (!GenericUtils.isEmpty(certificateFiles)) {
entry.removeProperty(CERTIFICATE_FILE_CONFIG_PROP);
String[] split = certificateFiles.split(",");
List resolved = new ArrayList<>(split.length);
for (String raw : split) {
resolved.add(resolveIdentityFilePath(raw, entry.getHostName(), entry.getPort(), entry.getUsername()));
}
entry.processProperty(CERTIFICATE_FILE_CONFIG_PROP, resolved);
}
return entry;
};
}
}
public static List readHostConfigEntries(Path path, OpenOption... options) throws IOException {
try (InputStream input = Files.newInputStream(path, options)) {
return readHostConfigEntries(input, true);
}
}
public static List readHostConfigEntries(URL url) throws IOException {
try (InputStream input = url.openStream()) {
return readHostConfigEntries(input, true);
}
}
public static List readHostConfigEntries(InputStream inStream, boolean okToClose) throws IOException {
try (Reader reader
= new InputStreamReader(NoCloseInputStream.resolveInputStream(inStream, okToClose), StandardCharsets.UTF_8)) {
return readHostConfigEntries(reader, true);
}
}
public static List readHostConfigEntries(Reader rdr, boolean okToClose) throws IOException {
try (BufferedReader buf = new BufferedReader(NoCloseReader.resolveReader(rdr, okToClose))) {
return readHostConfigEntries(buf);
}
}
/**
* Reads configuration entries
*
* @param rdr The {@link BufferedReader} to use
* @return The {@link List} of read {@link HostConfigEntry}-ies
* @throws IOException If failed to parse the read configuration
*/
public static List readHostConfigEntries(BufferedReader rdr) throws IOException {
HostConfigEntry curEntry = null;
List entries = new ArrayList<>();
int lineNumber = 1;
for (String line = rdr.readLine(); line != null; line = rdr.readLine(), lineNumber++) {
line = GenericUtils.replaceWhitespaceAndTrim(line);
if (GenericUtils.isEmpty(line)) {
continue;
}
// Strip off comments
int pos = line.indexOf(ConfigFileReaderSupport.COMMENT_CHAR);
if (pos == 0) {
continue;
}
if (pos > 0) {
line = line.substring(0, pos);
line = line.trim();
}
/*
* Some options use '=' as delimiter, others use ' '
* TODO: This version treats '=' as taking precedence, but that means '=' can't show up
* in a file name. A better approach is to break the line into tokens, possibly quoted,
* then detect '='.
*/
String key;
String value;
List valsList;
pos = line.indexOf('=');
if (pos > 0) {
key = line.substring(0, pos).trim();
value = line.substring(pos + 1);
valsList = new ArrayList<>(1);
valsList.add(value);
} else {
pos = line.indexOf(' ');
if (pos < 0) {
throw new StreamCorruptedException("No configuration value delimiter at line " + lineNumber + ": " + line);
}
key = line.substring(0, pos);
value = line.substring(pos + 1);
valsList = GenericUtils.filterToNotBlank(parseConfigValue(value));
}
// Detect transition to new entry.
if (HOST_CONFIG_PROP.equalsIgnoreCase(key)) {
if (GenericUtils.isEmpty(valsList)) {
throw new StreamCorruptedException("Missing host pattern(s) at line " + lineNumber + ": " + line);
}
if (curEntry != null) {
entries.add(curEntry);
}
curEntry = new HostConfigEntry();
curEntry.setHost(valsList);
} else if (MATCH_CONFIG_PROP.equalsIgnoreCase(key)) {
throw new StreamCorruptedException("Currently not able to process Match sections");
} else if (curEntry == null) {
// Properties that occur before the first Host or Match keyword are a kind of global entry.
curEntry = new HostConfigEntry();
curEntry.setHost(Collections.singletonList(ALL_HOSTS_PATTERN));
}
String joinedValue = GenericUtils.join(valsList, ',');
curEntry.appendPropertyValue(key, joinedValue);
curEntry.processProperty(key, valsList);
}
if (curEntry != null) {
entries.add(curEntry);
}
return entries;
}
public static void writeHostConfigEntries(
Path path, Collection entries, OpenOption... options)
throws IOException {
try (OutputStream outputStream = Files.newOutputStream(path, options)) {
writeHostConfigEntries(outputStream, true, entries);
}
}
public static void writeHostConfigEntries(
OutputStream outputStream, boolean okToClose, Collection entries)
throws IOException {
if (GenericUtils.isEmpty(entries)) {
return;
}
try (Writer w = new OutputStreamWriter(
NoCloseOutputStream.resolveOutputStream(outputStream, okToClose), StandardCharsets.UTF_8)) {
appendHostConfigEntries(w, entries);
}
}
public static A appendHostConfigEntries(A sb, Collection entries)
throws IOException {
if (GenericUtils.isEmpty(entries)) {
return sb;
}
for (HostConfigEntry entry : entries) {
entry.append(sb);
}
return sb;
}
/**
* Checks if this is a multi-value - allow space and comma
*
* @todo Handle quote marks.
* @param value The value - ignored if {@code null}/empty (after trimming)
* @return A {@link List} of the encountered values
*/
public static List parseConfigValue(String value) {
String s = GenericUtils.replaceWhitespaceAndTrim(value);
if (GenericUtils.isEmpty(s)) {
return Collections.emptyList();
}
for (int index = 0; index < MULTI_VALUE_SEPARATORS.length(); index++) {
char sep = MULTI_VALUE_SEPARATORS.charAt(index);
int pos = s.indexOf(sep);
if (pos >= 0) {
String[] vals = GenericUtils.split(s, sep);
if (GenericUtils.isEmpty(vals)) {
return Collections.emptyList();
} else {
return Arrays.asList(vals);
}
}
}
// this point is reached if no separators found
return Collections.singletonList(s);
}
// The file name may use the tilde syntax to refer to a user’s home directory or one of the following escape
// characters:
// '%d' (local user's home directory), '%u' (local user name), '%l' (local host name), '%h' (remote host name) or
// '%r' (remote user name).
public static String resolveIdentityFilePath(String id, String host, int port, String username) throws IOException {
if (GenericUtils.isEmpty(id)) {
return id;
}
String path = id.replace('/', File.separatorChar); // make sure all separators are local
String[] elements = GenericUtils.split(path, File.separatorChar);
StringBuilder sb = new StringBuilder(path.length() + Long.SIZE);
for (int index = 0; index < elements.length; index++) {
String elem = elements[index];
if (index > 0) {
sb.append(File.separatorChar);
}
for (int curPos = 0; curPos < elem.length(); curPos++) {
char ch = elem.charAt(curPos);
if (ch == PathUtils.HOME_TILDE_CHAR) {
ValidateUtils.checkTrue((curPos == 0) && (index == 0), "Home tilde must be first: %s", id);
PathUtils.appendUserHome(sb);
} else if (ch == PATH_MACRO_CHAR) {
curPos++;
ValidateUtils.checkTrue(curPos < elem.length(), "Missing macro modifier in %s", id);
ch = elem.charAt(curPos);
switch (ch) {
case PATH_MACRO_CHAR:
sb.append(ch);
break;
case LOCAL_HOME_MACRO:
ValidateUtils.checkTrue((curPos == 1) && (index == 0), "Home macro must be first: %s", id);
PathUtils.appendUserHome(sb);
break;
case LOCAL_USER_MACRO:
sb.append(ValidateUtils.checkNotNullAndNotEmpty(OsUtils.getCurrentUser(),
"No local user name value"));
break;
case LOCAL_HOST_MACRO: {
InetAddress address = Objects.requireNonNull(InetAddress.getLocalHost(), "No local address");
sb.append(ValidateUtils.checkNotNullAndNotEmpty(address.getHostName(), "No local name"));
break;
}
case REMOTE_HOST_MACRO:
sb.append(ValidateUtils.checkNotNullAndNotEmpty(host, "No remote host provided"));
break;
case REMOTE_USER_MACRO:
sb.append(ValidateUtils.checkNotNullAndNotEmpty(username, "No remote user provided"));
break;
case REMOTE_PORT_MACRO:
ValidateUtils.checkTrue(port > 0, "Bad remote port value: %d", port);
sb.append(port);
break;
default:
ValidateUtils.throwIllegalArgumentException("Bad modifier '%s' in %s", String.valueOf(ch), id);
}
} else {
sb.append(ch);
}
}
}
return sb.toString();
}
/**
* @return The default {@link Path} location of the OpenSSH hosts entries configuration file
*/
@SuppressWarnings("synthetic-access")
public static Path getDefaultHostConfigFile() {
return LazyDefaultConfigFileHolder.CONFIG_FILE;
}
}
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