1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38
39
40
41
42
43
44
45
46
47
48
49
50
51
52
53
54
55
56
57
58
59
60
61
62
63
64
65
66
67
68
69
70
71
72
73
74
75
76
77
78
79
80
81
82
83
84
85
86
87
88
89
90
91
92
93
94
95
96
97
98
99
100
101
102
103
104
105
106
107
108
109
110
111
112
113
114
115
116
117
118
119
120
121
122
123
124
125
126
127
128
129
130
131
132
133
134
135
136
137
138
139
140
141
142
143
144
145
146
147
148
149
150
151
152
153
154
155
156
157
158
159
160
161
162
163
164
165
166
167
168
169
170
171
172
173
174
175
176
177
178
179
180
181
182
183
184
185
|
//
// System.Web.Mail.SmtpStream.cs
//
// Author(s):
// Per Arneng <pt99par@student.bth.se>
//
//
using System;
using System.IO;
using System.Collections;
using System.Text;
using System.Security.Cryptography;
namespace System.Web.Mail {
internal class SmtpStream {
protected Stream stream;
protected Encoding encoding;
protected SmtpResponse lastResponse;
protected string command = "";
public SmtpStream( Stream stream ) {
this.stream = stream;
encoding = new ASCIIEncoding();
}
public Stream Stream {
get { return stream; }
}
public SmtpResponse LastResponse {
get { return lastResponse; }
}
public void WriteRset() {
command = "RSET";
WriteLine( command );
ReadResponse();
CheckForStatusCode( 250 );
}
public void WriteHelo( string hostName ) {
command = "HELO " + hostName;
WriteLine( command );
ReadResponse();
CheckForStatusCode( 250 );
}
public void WriteMailFrom( string from ) {
command = "MAIL FROM: <" + from + ">";
WriteLine( command );
ReadResponse();
CheckForStatusCode( 250 );
}
public void WriteRcptTo( string to ) {
command = "RCPT TO: <" + to + ">";
WriteLine( command );
ReadResponse();
CheckForStatusCode( 250 );
}
public void WriteData() {
command = "DATA";
WriteLine( command );
ReadResponse();
CheckForStatusCode( 354 );
}
public void WriteQuit() {
command = "QUIT";
WriteLine( command );
ReadResponse();
CheckForStatusCode( 221 );
}
public void WriteBoundary( string boundary ) {
WriteLine( "\r\n--{0}" , boundary );
}
public void WriteFinalBoundary( string boundary ) {
WriteLine( "\r\n--{0}--" , boundary );
}
// single dot by itself
public void WriteDataEndTag() {
command = "\r\n.";
WriteLine( command );
ReadResponse();
CheckForStatusCode( 250 );
}
public void WriteHeader( MailHeader header ) {
// write the headers
foreach( string key in header.Data.AllKeys )
WriteLine( "{0}: {1}" , key , header.Data[ key ] );
// write the header end tag
WriteLine( "" );
}
public void CheckForStatusCode( int statusCode ) {
if( LastResponse.StatusCode != statusCode ) {
string msg = "" +
"Server reponse: '" + lastResponse.RawResponse + "';" +
"Status code: '" + lastResponse.StatusCode + "';" +
"Expected status code: '" + statusCode + "';" +
"Last command: '" + command + "'";
throw new SmtpException( msg );
}
}
// write buffer's bytes to the stream
public void WriteBytes( byte[] buffer ) {
stream.Write( buffer , 0 , buffer.Length );
}
// writes a formatted line to the server
public void WriteLine( string format , params object[] args ) {
WriteLine( String.Format( format , args ) );
}
// writes a line to the server
public void WriteLine( string line ) {
byte[] buffer = encoding.GetBytes( line + "\r\n" );
stream.Write( buffer , 0 , buffer.Length );
#if DEBUG
DebugPrint( line );
#endif
}
// read a line from the server
public void ReadResponse( ) {
string line = null;
byte[] buffer = new byte[ 4096 ];
int readLength = stream.Read( buffer , 0 , buffer.Length );
if( readLength > 0 ) {
line = encoding.GetString( buffer , 0 , readLength );
line = line.TrimEnd( new Char[] { '\r' , '\n' , ' ' } );
}
// parse the line to the lastResponse object
lastResponse = SmtpResponse.Parse( line );
#if DEBUG
DebugPrint( line );
#endif
}
/// debug printing
private void DebugPrint( string line ) {
Console.WriteLine( "smtp: {0}" , line );
}
}
}
|
