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(.NET Core C#) SSH ReceiveUntilMatchNDemonstrates how to call the SSH ChannelReceiveUntilMatchN method.
// This example assumes the Chilkat API to have been previously unlocked. // See Global Unlock Sample for sample code. Chilkat.Ssh ssh = new Chilkat.Ssh(); bool success; // For the sake of the example, pretend the remote shell prompt // will be any of the following: Chilkat.StringArray saPrompts = new Chilkat.StringArray(); saPrompts.Append("~$"); saPrompts.Append("mars#"); saPrompts.Append("jupiter%"); saPrompts.Append("chilkat$"); saPrompts.Append("admin>"); string cmdOutput; // Connect to an SSH server: // Hostname may be an IP address or hostname: string hostname = "www.some-ssh-server.com"; int port = 22; success = ssh.Connect(hostname,port); if (success != true) { Debug.WriteLine(ssh.LastErrorText); return; } // Wait a max of 10 seconds when reading responses.. ssh.IdleTimeoutMs = 10000; // Authenticate using login/password: success = ssh.AuthenticatePw("myLogin","myPassword"); if (success != true) { Debug.WriteLine(ssh.LastErrorText); return; } // Open a session channel. (It is possible to have multiple // session channels open simultaneously.) int channelNum = ssh.OpenSessionChannel(); if (channelNum < 0) { Debug.WriteLine(ssh.LastErrorText); return; } string termType = "dumb"; int widthInChars = 120; int heightInChars = 40; // Use 0 for pixWidth and pixHeight when the dimensions // are set in number-of-chars. int pixWidth = 0; int pixHeight = 0; success = ssh.SendReqPty(channelNum,termType,widthInChars,heightInChars,pixWidth,pixHeight); if (success != true) { Debug.WriteLine(ssh.LastErrorText); return; } // Start a shell on the channel: success = ssh.SendReqShell(channelNum); if (success != true) { Debug.WriteLine(ssh.LastErrorText); return; } // Run the 1st command in the remote shell, which will be to // "cd" to a subdirectory. success = ssh.ChannelSendString(channelNum,"cd workspace\n","utf-8"); if (success != true) { Debug.WriteLine(ssh.LastErrorText); return; } // Retrieve the output to the next prompt: bool caseSensitiveMatch = true; success = ssh.ChannelReceiveUntilMatchN(channelNum,saPrompts,"utf-8",caseSensitiveMatch); if (success != true) { Debug.WriteLine(ssh.LastErrorText); return; } // Display what we've received so far. This clears // the internal receive buffer, which is important. // After we send the command, we'll be reading until // the next command prompt. If the command prompt // is already in the internal receive buffer, it'll think it's // already finished... cmdOutput = ssh.GetReceivedText(channelNum,"utf-8"); if (ssh.LastMethodSuccess != true) { Debug.WriteLine(ssh.LastErrorText); return; } Debug.WriteLine(cmdOutput); // Run the 2nd command in the remote shell, which will be // to "ls" the directory. success = ssh.ChannelSendString(channelNum,"ls\n","utf-8"); if (success != true) { Debug.WriteLine(ssh.LastErrorText); return; } // Retrieve and display the output. success = ssh.ChannelReceiveUntilMatchN(channelNum,saPrompts,"utf-8",caseSensitiveMatch); if (success != true) { Debug.WriteLine(ssh.LastErrorText); return; } cmdOutput = ssh.GetReceivedText(channelNum,"utf-8"); if (ssh.LastMethodSuccess != true) { Debug.WriteLine(ssh.LastErrorText); return; } Debug.WriteLine(cmdOutput); // Start the final command in the remote shell. This example // will send a "ls -l" command to retrieve the long format directory listing. success = ssh.ChannelSendString(channelNum,"ls -l\n","utf-8"); if (success != true) { Debug.WriteLine(ssh.LastErrorText); return; } // Send an EOF. This tells the server that no more data will // be sent on this channel. The channel remains open, and // the SSH client may still receive output on this channel. success = ssh.ChannelSendEof(channelNum); if (success != true) { Debug.WriteLine(ssh.LastErrorText); return; } // Read whatever output may already be available on the // SSH connection. ChannelReadAndPoll returns the number of bytes // that are available in the channel's internal buffer that // are ready to be "picked up" by calling GetReceivedText // or GetReceivedData. // A return value of -1 indicates failure. // A return value of -2 indicates a failure via timeout. // The ChannelReadAndPoll method waits // for data to arrive on the connection usingi the IdleTimeoutMs // property setting. Once the first data arrives, it continues // reading but instead uses the pollTimeoutMs passed in the 2nd argument: // A return value of -2 indicates a timeout where no data is received. int pollTimeoutMs = 2000; int n = ssh.ChannelReadAndPoll(channelNum,pollTimeoutMs); if (n < 0) { Debug.WriteLine(ssh.LastErrorText); return; } // Close the channel: success = ssh.ChannelSendClose(channelNum); if (success != true) { Debug.WriteLine(ssh.LastErrorText); return; } // Perhaps we did not receive all of the commands output. // To make sure, call ChannelReceiveToClose to accumulate any remaining // output until the server's corresponding "channel close" is received. success = ssh.ChannelReceiveToClose(channelNum); if (success != true) { Debug.WriteLine(ssh.LastErrorText); return; } cmdOutput = ssh.GetReceivedText(channelNum,"utf-8"); if (ssh.LastMethodSuccess != true) { Debug.WriteLine(ssh.LastErrorText); return; } Debug.WriteLine(cmdOutput); // Disconnect ssh.Disconnect(); |
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