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annotate src/ch/ethz/ssh2/SCPClient.java @ 286:4656869af8fe ganymed

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start conversion from trilead to ganymed
author Carl Byington <carl@five-ten-sg.com>
date Fri, 18 Jul 2014 19:26:29 -0700
parents 91a31873c42a
children 9ae4ed7bb523
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Carl Byington <carl@five-ten-sg.com>
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1 package ch.ethz.ssh2;
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2
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3 import java.io.IOException;
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4 import java.io.InputStream;
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5 import java.nio.charset.Charset;
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6 import java.nio.charset.UnsupportedCharsetException;
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7
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8 /**
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9 * A very basic <code>SCPClient</code> that can be used to copy files from/to
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10 * the SSH-2 server. On the server side, the "scp" program must be in the PATH.
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11 * <p/>
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12 * This scp client is thread safe - you can download (and upload) different sets
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13 * of files concurrently without any troubles. The <code>SCPClient</code> is
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14 * actually mapping every request to a distinct {@link ch.ethz.ssh2.Session}.
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15 *
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16 * @author Christian Plattner, plattner@inf.ethz.ch
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17 * @version $Id: SCPClient.java 85 2014-04-07 14:05:09Z dkocher@sudo.ch $
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18 */
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19
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20 public class SCPClient
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21 {
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22 Connection conn;
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23
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24 String charsetName = null;
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25
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26 /**
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27 * Set the charset used to convert between Java Unicode Strings and byte encodings
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28 * used by the server for paths and file names.
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29 *
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30 * @param charset the name of the charset to be used or <code>null</code> to use the platform's
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31 * default encoding.
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32 * @throws IOException
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33 * @see #getCharset()
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34 */
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35 public void setCharset(String charset) throws IOException
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36 {
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37 if (charset == null)
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38 {
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39 charsetName = charset;
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40 return;
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41 }
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42
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43 try
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44 {
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45 Charset.forName(charset);
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46 }
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47 catch (UnsupportedCharsetException e)
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48 {
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49 throw new IOException("This charset is not supported", e);
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50 }
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51 charsetName = charset;
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52 }
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53
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54 /**
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55 * The currently used charset for filename encoding/decoding.
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56 *
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57 * @return The name of the charset (<code>null</code> if the platform's default charset is being used)
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58 * @see #setCharset(String)
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59 */
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60 public String getCharset()
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61 {
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62 return charsetName;
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63 }
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64
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65 public class LenNamePair
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66 {
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67 public long length;
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68 String filename;
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69 }
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70
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71 public SCPClient(Connection conn)
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72 {
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73 if (conn == null)
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74 throw new IllegalArgumentException("Cannot accept null argument!");
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75 this.conn = conn;
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76 }
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77
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78 protected void readResponse(InputStream is) throws IOException
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79 {
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80 int c = is.read();
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81
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82 if (c == 0)
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83 return;
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84
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85 if (c == -1)
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86 throw new IOException("Remote scp terminated unexpectedly.");
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87
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88 if ((c != 1) && (c != 2))
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89 throw new IOException("Remote scp sent illegal error code.");
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90
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91 if (c == 2)
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92 throw new IOException("Remote scp terminated with error.");
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93
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94 String err = receiveLine(is);
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95 throw new IOException("Remote scp terminated with error (" + err + ").");
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96 }
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97
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98 protected String receiveLine(InputStream is) throws IOException
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99 {
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100 StringBuilder sb = new StringBuilder(30);
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101
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102 while (true)
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103 {
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104 /* This is a random limit - if your path names are longer, then adjust it */
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105
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106 if (sb.length() > 8192)
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107 throw new IOException("Remote scp sent a too long line");
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108
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109 int c = is.read();
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110
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111 if (c < 0)
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112 throw new IOException("Remote scp terminated unexpectedly.");
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113
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114 if (c == '\n')
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115 break;
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116
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117 sb.append((char) c);
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118
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119 }
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120 return sb.toString();
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121 }
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122
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123 protected LenNamePair parseCLine(String line) throws IOException
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124 {
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125 /* Minimum line: "xxxx y z" ---> 8 chars */
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126
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127 if (line.length() < 8)
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128 throw new IOException("Malformed C line sent by remote SCP binary, line too short.");
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129
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130 if ((line.charAt(4) != ' ') || (line.charAt(5) == ' '))
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131 throw new IOException("Malformed C line sent by remote SCP binary.");
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132
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133 int length_name_sep = line.indexOf(' ', 5);
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134
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135 if (length_name_sep == -1)
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136 throw new IOException("Malformed C line sent by remote SCP binary.");
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137
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138 String length_substring = line.substring(5, length_name_sep);
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139 String name_substring = line.substring(length_name_sep + 1);
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140
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141 if ((length_substring.length() <= 0) || (name_substring.length() <= 0))
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142 throw new IOException("Malformed C line sent by remote SCP binary.");
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143
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144 if ((6 + length_substring.length() + name_substring.length()) != line.length())
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145 throw new IOException("Malformed C line sent by remote SCP binary.");
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146
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147 final long len;
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148 try
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149 {
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150 len = Long.parseLong(length_substring);
91a31873c42a start conversion from trilead to ganymed
Carl Byington <carl@five-ten-sg.com>
parents:
diff changeset
151 }
91a31873c42a start conversion from trilead to ganymed
Carl Byington <carl@five-ten-sg.com>
parents:
diff changeset
152 catch (NumberFormatException e)
91a31873c42a start conversion from trilead to ganymed
Carl Byington <carl@five-ten-sg.com>
parents:
diff changeset
153 {
91a31873c42a start conversion from trilead to ganymed
Carl Byington <carl@five-ten-sg.com>
parents:
diff changeset
154 throw new IOException("Malformed C line sent by remote SCP binary, cannot parse file length.");
91a31873c42a start conversion from trilead to ganymed
Carl Byington <carl@five-ten-sg.com>
parents:
diff changeset
155 }
91a31873c42a start conversion from trilead to ganymed
Carl Byington <carl@five-ten-sg.com>
parents:
diff changeset
156
91a31873c42a start conversion from trilead to ganymed
Carl Byington <carl@five-ten-sg.com>
parents:
diff changeset
157 if (len < 0)
91a31873c42a start conversion from trilead to ganymed
Carl Byington <carl@five-ten-sg.com>
parents:
diff changeset
158 throw new IOException("Malformed C line sent by remote SCP binary, illegal file length.");
91a31873c42a start conversion from trilead to ganymed
Carl Byington <carl@five-ten-sg.com>
parents:
diff changeset
159
91a31873c42a start conversion from trilead to ganymed
Carl Byington <carl@five-ten-sg.com>
parents:
diff changeset
160 LenNamePair lnp = new LenNamePair();
91a31873c42a start conversion from trilead to ganymed
Carl Byington <carl@five-ten-sg.com>
parents:
diff changeset
161 lnp.length = len;
91a31873c42a start conversion from trilead to ganymed
Carl Byington <carl@five-ten-sg.com>
parents:
diff changeset
162 lnp.filename = name_substring;
91a31873c42a start conversion from trilead to ganymed
Carl Byington <carl@five-ten-sg.com>
parents:
diff changeset
163
91a31873c42a start conversion from trilead to ganymed
Carl Byington <carl@five-ten-sg.com>
parents:
diff changeset
164 return lnp;
91a31873c42a start conversion from trilead to ganymed
Carl Byington <carl@five-ten-sg.com>
parents:
diff changeset
165 }
91a31873c42a start conversion from trilead to ganymed
Carl Byington <carl@five-ten-sg.com>
parents:
diff changeset
166
91a31873c42a start conversion from trilead to ganymed
Carl Byington <carl@five-ten-sg.com>
parents:
diff changeset
167 /**
91a31873c42a start conversion from trilead to ganymed
Carl Byington <carl@five-ten-sg.com>
parents:
diff changeset
168 * The session for opened for this SCP transfer must be closed using
91a31873c42a start conversion from trilead to ganymed
Carl Byington <carl@five-ten-sg.com>
parents:
diff changeset
169 * SCPOutputStream#close
91a31873c42a start conversion from trilead to ganymed
Carl Byington <carl@five-ten-sg.com>
parents:
diff changeset
170 *
91a31873c42a start conversion from trilead to ganymed
Carl Byington <carl@five-ten-sg.com>
parents:
diff changeset
171 * @param remoteFile
91a31873c42a start conversion from trilead to ganymed
Carl Byington <carl@five-ten-sg.com>
parents:
diff changeset
172 * @param length The size of the file to send
91a31873c42a start conversion from trilead to ganymed
Carl Byington <carl@five-ten-sg.com>
parents:
diff changeset
173 * @param remoteTargetDirectory
91a31873c42a start conversion from trilead to ganymed
Carl Byington <carl@five-ten-sg.com>
parents:
diff changeset
174 * @param mode
91a31873c42a start conversion from trilead to ganymed
Carl Byington <carl@five-ten-sg.com>
parents:
diff changeset
175 * @return
91a31873c42a start conversion from trilead to ganymed
Carl Byington <carl@five-ten-sg.com>
parents:
diff changeset
176 * @throws IOException
91a31873c42a start conversion from trilead to ganymed
Carl Byington <carl@five-ten-sg.com>
parents:
diff changeset
177 */
91a31873c42a start conversion from trilead to ganymed
Carl Byington <carl@five-ten-sg.com>
parents:
diff changeset
178 public SCPOutputStream put(final String remoteFile, long length, String remoteTargetDirectory, String mode)
91a31873c42a start conversion from trilead to ganymed
Carl Byington <carl@five-ten-sg.com>
parents:
diff changeset
179 throws IOException
91a31873c42a start conversion from trilead to ganymed
Carl Byington <carl@five-ten-sg.com>
parents:
diff changeset
180 {
91a31873c42a start conversion from trilead to ganymed
Carl Byington <carl@five-ten-sg.com>
parents:
diff changeset
181 Session sess = null;
91a31873c42a start conversion from trilead to ganymed
Carl Byington <carl@five-ten-sg.com>
parents:
diff changeset
182
91a31873c42a start conversion from trilead to ganymed
Carl Byington <carl@five-ten-sg.com>
parents:
diff changeset
183 if (null == remoteFile)
91a31873c42a start conversion from trilead to ganymed
Carl Byington <carl@five-ten-sg.com>
parents:
diff changeset
184 throw new IllegalArgumentException("Null argument.");
91a31873c42a start conversion from trilead to ganymed
Carl Byington <carl@five-ten-sg.com>
parents:
diff changeset
185 if (null == remoteTargetDirectory)
91a31873c42a start conversion from trilead to ganymed
Carl Byington <carl@five-ten-sg.com>
parents:
diff changeset
186 remoteTargetDirectory = "";
91a31873c42a start conversion from trilead to ganymed
Carl Byington <carl@five-ten-sg.com>
parents:
diff changeset
187 if (null == mode)
91a31873c42a start conversion from trilead to ganymed
Carl Byington <carl@five-ten-sg.com>
parents:
diff changeset
188 mode = "0600";
91a31873c42a start conversion from trilead to ganymed
Carl Byington <carl@five-ten-sg.com>
parents:
diff changeset
189 if (mode.length() != 4)
91a31873c42a start conversion from trilead to ganymed
Carl Byington <carl@five-ten-sg.com>
parents:
diff changeset
190 throw new IllegalArgumentException("Invalid mode.");
91a31873c42a start conversion from trilead to ganymed
Carl Byington <carl@five-ten-sg.com>
parents:
diff changeset
191
91a31873c42a start conversion from trilead to ganymed
Carl Byington <carl@five-ten-sg.com>
parents:
diff changeset
192 for (int i = 0; i < mode.length(); i++)
91a31873c42a start conversion from trilead to ganymed
Carl Byington <carl@five-ten-sg.com>
parents:
diff changeset
193 if (Character.isDigit(mode.charAt(i)) == false)
91a31873c42a start conversion from trilead to ganymed
Carl Byington <carl@five-ten-sg.com>
parents:
diff changeset
194 throw new IllegalArgumentException("Invalid mode.");
91a31873c42a start conversion from trilead to ganymed
Carl Byington <carl@five-ten-sg.com>
parents:
diff changeset
195
91a31873c42a start conversion from trilead to ganymed
Carl Byington <carl@five-ten-sg.com>
parents:
diff changeset
196 remoteTargetDirectory = (remoteTargetDirectory.length() > 0) ? remoteTargetDirectory : ".";
91a31873c42a start conversion from trilead to ganymed
Carl Byington <carl@five-ten-sg.com>
parents:
diff changeset
197
91a31873c42a start conversion from trilead to ganymed
Carl Byington <carl@five-ten-sg.com>
parents:
diff changeset
198 String cmd = "scp -t -d \"" + remoteTargetDirectory + "\"";
91a31873c42a start conversion from trilead to ganymed
Carl Byington <carl@five-ten-sg.com>
parents:
diff changeset
199
91a31873c42a start conversion from trilead to ganymed
Carl Byington <carl@five-ten-sg.com>
parents:
diff changeset
200 sess = conn.openSession();
91a31873c42a start conversion from trilead to ganymed
Carl Byington <carl@five-ten-sg.com>
parents:
diff changeset
201 sess.execCommand(cmd, charsetName);
91a31873c42a start conversion from trilead to ganymed
Carl Byington <carl@five-ten-sg.com>
parents:
diff changeset
202
91a31873c42a start conversion from trilead to ganymed
Carl Byington <carl@five-ten-sg.com>
parents:
diff changeset
203 return new SCPOutputStream(this, sess, remoteFile, length, mode);
91a31873c42a start conversion from trilead to ganymed
Carl Byington <carl@five-ten-sg.com>
parents:
diff changeset
204 }
91a31873c42a start conversion from trilead to ganymed
Carl Byington <carl@five-ten-sg.com>
parents:
diff changeset
205
91a31873c42a start conversion from trilead to ganymed
Carl Byington <carl@five-ten-sg.com>
parents:
diff changeset
206 /**
91a31873c42a start conversion from trilead to ganymed
Carl Byington <carl@five-ten-sg.com>
parents:
diff changeset
207 * The session for opened for this SCP transfer must be closed using
91a31873c42a start conversion from trilead to ganymed
Carl Byington <carl@five-ten-sg.com>
parents:
diff changeset
208 * SCPInputStream#close
91a31873c42a start conversion from trilead to ganymed
Carl Byington <carl@five-ten-sg.com>
parents:
diff changeset
209 *
91a31873c42a start conversion from trilead to ganymed
Carl Byington <carl@five-ten-sg.com>
parents:
diff changeset
210 * @param remoteFile
91a31873c42a start conversion from trilead to ganymed
Carl Byington <carl@five-ten-sg.com>
parents:
diff changeset
211 * @return
91a31873c42a start conversion from trilead to ganymed
Carl Byington <carl@five-ten-sg.com>
parents:
diff changeset
212 * @throws IOException
91a31873c42a start conversion from trilead to ganymed
Carl Byington <carl@five-ten-sg.com>
parents:
diff changeset
213 */
91a31873c42a start conversion from trilead to ganymed
Carl Byington <carl@five-ten-sg.com>
parents:
diff changeset
214 public SCPInputStream get(final String remoteFile) throws IOException
91a31873c42a start conversion from trilead to ganymed
Carl Byington <carl@five-ten-sg.com>
parents:
diff changeset
215 {
91a31873c42a start conversion from trilead to ganymed
Carl Byington <carl@five-ten-sg.com>
parents:
diff changeset
216 Session sess = null;
91a31873c42a start conversion from trilead to ganymed
Carl Byington <carl@five-ten-sg.com>
parents:
diff changeset
217
91a31873c42a start conversion from trilead to ganymed
Carl Byington <carl@five-ten-sg.com>
parents:
diff changeset
218 if (null == remoteFile)
91a31873c42a start conversion from trilead to ganymed
Carl Byington <carl@five-ten-sg.com>
parents:
diff changeset
219 throw new IllegalArgumentException("Null argument.");
91a31873c42a start conversion from trilead to ganymed
Carl Byington <carl@five-ten-sg.com>
parents:
diff changeset
220
91a31873c42a start conversion from trilead to ganymed
Carl Byington <carl@five-ten-sg.com>
parents:
diff changeset
221 if (remoteFile.length() == 0)
91a31873c42a start conversion from trilead to ganymed
Carl Byington <carl@five-ten-sg.com>
parents:
diff changeset
222 throw new IllegalArgumentException("Cannot accept empty filename.");
91a31873c42a start conversion from trilead to ganymed
Carl Byington <carl@five-ten-sg.com>
parents:
diff changeset
223
91a31873c42a start conversion from trilead to ganymed
Carl Byington <carl@five-ten-sg.com>
parents:
diff changeset
224 String cmd = "scp -f";
91a31873c42a start conversion from trilead to ganymed
Carl Byington <carl@five-ten-sg.com>
parents:
diff changeset
225 cmd += (" \"" + remoteFile + "\"");
91a31873c42a start conversion from trilead to ganymed
Carl Byington <carl@five-ten-sg.com>
parents:
diff changeset
226
91a31873c42a start conversion from trilead to ganymed
Carl Byington <carl@five-ten-sg.com>
parents:
diff changeset
227 sess = conn.openSession();
91a31873c42a start conversion from trilead to ganymed
Carl Byington <carl@five-ten-sg.com>
parents:
diff changeset
228 sess.execCommand(cmd, charsetName);
91a31873c42a start conversion from trilead to ganymed
Carl Byington <carl@five-ten-sg.com>
parents:
diff changeset
229
91a31873c42a start conversion from trilead to ganymed
Carl Byington <carl@five-ten-sg.com>
parents:
diff changeset
230 return new SCPInputStream(this, sess);
91a31873c42a start conversion from trilead to ganymed
Carl Byington <carl@five-ten-sg.com>
parents:
diff changeset
231 }
91a31873c42a start conversion from trilead to ganymed
Carl Byington <carl@five-ten-sg.com>
parents:
diff changeset
232 }