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(Unicode C) SSH Remote ShellDemonstrates how to start a shell on a remote SSH server, run a command, and retrieve the output.
#include <C_CkSshW.h> void ChilkatSample(void) { HCkSshW ssh; const wchar_t *hostname; int port; BOOL success; int channelNum; const wchar_t *termType; int widthInChars; int heightInChars; int pixWidth; int pixHeight; int n; int pollTimeoutMs; const wchar_t *cmdOutput; // This example assumes the Chilkat API to have been previously unlocked. // See Global Unlock Sample for sample code. ssh = CkSshW_Create(); // Hostname may be an IP address or hostname: hostname = L"www.some-ssh-server.com"; port = 22; // Connect to an SSH server: success = CkSshW_Connect(ssh,hostname,port); if (success != TRUE) { wprintf(L"%s\n",CkSshW_lastErrorText(ssh)); CkSshW_Dispose(ssh); return; } // Wait a max of 5 seconds when reading responses.. CkSshW_putIdleTimeoutMs(ssh,5000); // Authenticate using login/password: success = CkSshW_AuthenticatePw(ssh,L"myLogin",L"myPassword"); if (success != TRUE) { wprintf(L"%s\n",CkSshW_lastErrorText(ssh)); CkSshW_Dispose(ssh); return; } // Open a session channel. (It is possible to have multiple // session channels open simultaneously.) channelNum = CkSshW_OpenSessionChannel(ssh); if (channelNum < 0) { wprintf(L"%s\n",CkSshW_lastErrorText(ssh)); CkSshW_Dispose(ssh); return; } // Some SSH servers require a pseudo-terminal // If so, include the call to SendReqPty. If not, then // comment out the call to SendReqPty. // Note: The 2nd argument of SendReqPty is the terminal type, // which should be something like "xterm", "vt100", "dumb", etc. // A "dumb" terminal is one that cannot process escape sequences. // Smart terminals, such as "xterm", "vt100", etc. process // escape sequences. If you select a type of smart terminal, // your application will receive these escape sequences // included in the command's output. Use "dumb" if you do not // want to receive escape sequences. (Assuming your SSH // server recognizes "dumb" as a standard dumb terminal.) termType = L"dumb"; widthInChars = 120; heightInChars = 40; // Use 0 for pixWidth and pixHeight when the dimensions // are set in number-of-chars. pixWidth = 0; pixHeight = 0; success = CkSshW_SendReqPty(ssh,channelNum,termType,widthInChars,heightInChars,pixWidth,pixHeight); if (success != TRUE) { wprintf(L"%s\n",CkSshW_lastErrorText(ssh)); CkSshW_Dispose(ssh); return; } // Start a shell on the channel: success = CkSshW_SendReqShell(ssh,channelNum); if (success != TRUE) { wprintf(L"%s\n",CkSshW_lastErrorText(ssh)); CkSshW_Dispose(ssh); return; } // Start a command in the remote shell. This example // will send a "ls" command to retrieve the directory listing. success = CkSshW_ChannelSendString(ssh,channelNum,L"ls\r\n",L"ansi"); if (success != TRUE) { wprintf(L"%s\n",CkSshW_lastErrorText(ssh)); CkSshW_Dispose(ssh); 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 = CkSshW_ChannelSendEof(ssh,channelNum); if (success != TRUE) { wprintf(L"%s\n",CkSshW_lastErrorText(ssh)); CkSshW_Dispose(ssh); 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. pollTimeoutMs = 2000; n = CkSshW_ChannelReadAndPoll(ssh,channelNum,pollTimeoutMs); if (n < 0) { wprintf(L"%s\n",CkSshW_lastErrorText(ssh)); CkSshW_Dispose(ssh); return; } // Close the channel: success = CkSshW_ChannelSendClose(ssh,channelNum); if (success != TRUE) { wprintf(L"%s\n",CkSshW_lastErrorText(ssh)); CkSshW_Dispose(ssh); 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 = CkSshW_ChannelReceiveToClose(ssh,channelNum); if (success != TRUE) { wprintf(L"%s\n",CkSshW_lastErrorText(ssh)); CkSshW_Dispose(ssh); return; } // Let's pickup the accumulated output of the command: cmdOutput = CkSshW_getReceivedText(ssh,channelNum,L"ansi"); if (CkSshW_getLastMethodSuccess(ssh) != TRUE) { wprintf(L"%s\n",CkSshW_lastErrorText(ssh)); CkSshW_Dispose(ssh); return; } // Display the remote shell's command output: wprintf(L"%s\n",cmdOutput); // Disconnect CkSshW_Disconnect(ssh); CkSshW_Dispose(ssh); } |
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