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Multiple SendReqExec on Same ConnectionShows how to execute a series of commands on an SSH server and retrieve each command's output (using SendReqExec). Each call to SendReqExec requires its own logical session channel. This is not a separate TCP/IP connection -- it's simply a new session channel on the existing connection. The sequence of Chilkat SSH calls would look like this: Connect AuthenticatePw (or AuthenticatePk) OpenSessionChannel SendReqExec
import com.chilkatsoft.*; public class ChilkatExample { static { try { System.loadLibrary("chilkat"); } catch (UnsatisfiedLinkError e) { System.err.println("Native code library failed to load.\n" + e); System.exit(1); } } public static void main(String argv[]) { // Important: It is helpful to send the contents of the // ssh.LastErrorText property when requesting support. CkSsh ssh = new CkSsh(); // Any string automatically begins a fully-functional 30-day trial. boolean success; success = ssh.UnlockComponent("Anything for 30-day trial"); if (success != true) { System.out.println(ssh.lastErrorText()); return; } // Connect to an SSH server: String hostname; int port; // Hostname may be an IP address or hostname: hostname = "192.168.1.117"; port = 22; success = ssh.Connect(hostname,port); if (success != true) { System.out.println(ssh.lastErrorText()); return; } // Wait a max of 5 seconds when reading responses.. ssh.put_IdleTimeoutMs(5000); // Authenticate using login/password: success = ssh.AuthenticatePw("myLogin","myPassword"); if (success != true) { System.out.println(ssh.lastErrorText()); return; } // Open a session channel. (It is possible to have multiple // session channels open simultaneously.) int channelNum; channelNum = ssh.OpenSessionChannel(); if (channelNum < 0) { System.out.println(ssh.lastErrorText()); return; } // Request a directory listing on the remote server: // If your server is Linux/UNIX, change the string from "dir" to "ls" // Note: Some SSH servers require a CRLF instead of a bare-LF success = ssh.SendReqExec(channelNum,"ls -al\n"); if (success != true) { System.out.println(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 n; int pollTimeoutMs; pollTimeoutMs = 2000; n = ssh.ChannelReadAndPoll(channelNum,pollTimeoutMs); if (n < 0) { System.out.println(ssh.lastErrorText()); return; } // Close the channel: success = ssh.ChannelSendClose(channelNum); if (success != true) { System.out.println(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) { System.out.println(ssh.lastErrorText()); return; } // Let's pickup the accumulated output of the command: String cmdOutput; cmdOutput = ssh.getReceivedText(channelNum,"ansi"); if (cmdOutput == null ) { System.out.println(ssh.lastErrorText()); return; } // Display the remote shell's command output: System.out.println(cmdOutput); System.out.println("----"); // ----------------------------------------------------------------- // Now for the 2nd SendReqExe (on the same connection, // but on a separate logical channel). // ----------------------------------------------------------------- channelNum = ssh.OpenSessionChannel(); if (channelNum < 0) { System.out.println(ssh.lastErrorText()); return; } success = ssh.SendReqExec(channelNum,"nslookup chilkatsoft.com\n"); if (success != true) { System.out.println(ssh.lastErrorText()); return; } pollTimeoutMs = 2000; n = ssh.ChannelReadAndPoll(channelNum,pollTimeoutMs); if (n < 0) { System.out.println(ssh.lastErrorText()); return; } success = ssh.ChannelSendClose(channelNum); if (success != true) { System.out.println(ssh.lastErrorText()); return; } success = ssh.ChannelReceiveToClose(channelNum); if (success != true) { System.out.println(ssh.lastErrorText()); return; } cmdOutput = ssh.getReceivedText(channelNum,"ansi"); if (cmdOutput == null ) { System.out.println(ssh.lastErrorText()); return; } System.out.println(cmdOutput); // Disconnect ssh.Disconnect(); } } |
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