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(Unicode C) Using sudo in an SSH Shell SessionSee more SSH ExamplesDemonstrates how to run a command as sudo in a shell session.
#include <C_CkSshW.h> #include <C_CkStringBuilderW.h> void ChilkatSample(void) { HCkSshW ssh; int port; BOOL success; int channelNum; HCkStringBuilderW sbCommands; // This example requires the Chilkat API to have been previously unlocked. // See Global Unlock Sample for sample code. ssh = CkSshW_Create(); port = 22; success = CkSshW_Connect(ssh,L"the-ssh-server.com",port); if (success != TRUE) { wprintf(L"%s\n",CkSshW_lastErrorText(ssh)); CkSshW_Dispose(ssh); return; } // Authenticate using login/password: success = CkSshW_AuthenticatePw(ssh,L"theSshLogin",L"theSshPassword"); if (success != TRUE) { wprintf(L"%s\n",CkSshW_lastErrorText(ssh)); CkSshW_Dispose(ssh); return; } // Start a shell session. // (The QuickShell method was added in Chilkat v9.5.0.65) channelNum = CkSshW_QuickShell(ssh); if (channelNum < 0) { wprintf(L"%s\n",CkSshW_lastErrorText(ssh)); CkSshW_Dispose(ssh); return; } // Construct a StringBuilder with our command ("ls") run with "sudo" // Note: The line-endings are potentially important. Some SSH servers may // require either LF or CRLF line endings. (Unix/Linux/OSX servers typically // use bare-LF line endings. Windows servers likely use CRLF line endings.) // Using "sudo -S" causes the sudo prompt to be written to stderr, // and the password is read from stdin (i.e. from the echo command ouput). // The sudo commands -p option allows us to set the prompt, and we can set it to // the empty string, thus eliminating the prompt from the stderr completely. // This allows us to run the command as root (super-user) with no prompt. sbCommands = CkStringBuilderW_Create(); CkStringBuilderW_Append(sbCommands,L"echo \"theSshPassword\" | sudo -S -p \"\" ls\n"); // Add another command to echo a marker string that // we'll use in ChannelReceiveUntilMatch below. // The use of single quotes around 'IS' is a trick so that the output // of the command is "THIS IS THE END OF THE SCRIPT", but the terminal echo // includes the single quotes. This allows us to read until we see the actual // output of the last command. CkStringBuilderW_Append(sbCommands,L"echo THIS 'IS' THE END OF THE SCRIPT\n"); // Send the commands.. success = CkSshW_ChannelSendString(ssh,channelNum,CkStringBuilderW_getAsString(sbCommands),L"ansi"); if (success != TRUE) { wprintf(L"%s\n",CkSshW_lastErrorText(ssh)); CkSshW_Dispose(ssh); CkStringBuilderW_Dispose(sbCommands); return; } // Send an EOF to indicate no more commands will be sent. // For brevity, we're not checking the return values of each method call. // Your code should check the success/failure of each call. success = CkSshW_ChannelSendEof(ssh,channelNum); // Receive output up to our marker. success = CkSshW_ChannelReceiveUntilMatch(ssh,channelNum,L"THIS IS THE END OF THE SCRIPT",L"ansi",TRUE); // Close the channel. // It is important to close the channel only after receiving the desired output. success = CkSshW_ChannelSendClose(ssh,channelNum); // Get any remaining output.. success = CkSshW_ChannelReceiveToClose(ssh,channelNum); // Get the complete output for all the commands in the session. wprintf(L"--- output ----\n"); wprintf(L"%s\n",CkSshW_getReceivedText(ssh,channelNum,L"ansi")); CkSshW_Dispose(ssh); CkStringBuilderW_Dispose(sbCommands); } |
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