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(Unicode C) POP3 SSH Tunneling (Port Forwarding)Demonstrates how to connect to a POP3 server through an SSH tunnel. Reads a POP3 mailbox and display the FROM and SUBJECT header fields of each email.
#include <C_CkMailManW.h> #include <C_CkEmailW.h> void ChilkatSample(void) { HCkMailManW mailman; const wchar_t *sshHostname; int sshPort; BOOL success; int numToDownload; int i; HCkEmailW email; // This example requires the Chilkat API to have been previously unlocked. // See Global Unlock Sample for sample code. // The mailman object is used for receiving (POP3) // and sending (SMTP) email. mailman = CkMailManW_Create(); // The SSH hostname may be a hostname or an // IP address, such as "192.168.1.108". // The port is typically 22 (the standard port for SSH). sshHostname = L"www.my-ssh-server.com"; sshPort = 22; // Connect to an SSH server and establish the SSH tunnel: success = CkMailManW_SshOpenTunnel(mailman,sshHostname,sshPort); if (success != TRUE) { wprintf(L"%s\n",CkMailManW_lastErrorText(mailman)); CkMailManW_Dispose(mailman); return; } // Authenticate with the SSH server via a login/password // or with a public key. // This example demonstrates SSH password authentication. // Note: This is not authenticating with the POP3 server, it is // for authenticating with the SSH server, which is separate. success = CkMailManW_SshAuthenticatePw(mailman,L"ssh_login",L"ssh_password"); if (success != TRUE) { wprintf(L"%s\n",CkMailManW_lastErrorText(mailman)); CkMailManW_Dispose(mailman); return; } // OK, the SSH tunnel is setup. The mailman may // be used exactly the same as usual, except all communications // are now sent through the SSH tunnel. // The SSH tunnel may be kept open for any number of // POP3 connections. // Set the POP3 server's hostname CkMailManW_putMailHost(mailman,L"mail.my-pop3-server.com"); // Set the POP3 settings for your POP3 server: CkMailManW_putPopUsername(mailman,L"pop3_login"); CkMailManW_putPopPassword(mailman,L"pop3_password"); CkMailManW_putMailPort(mailman,995); CkMailManW_putPopSsl(mailman,TRUE); // Connect to the POP3 server through the already-established SSH tunnel: success = CkMailManW_Pop3BeginSession(mailman); if (success != TRUE) { wprintf(L"%s\n",CkMailManW_lastErrorText(mailman)); CkMailManW_Dispose(mailman); return; } // A visual inspection of the LastErrorText after // a successful POP3 connection will confirm the SSH tunneling. // Note: If the POP3 connection uses SSL/TLS, then the SSL/TLS // secure channel will be wrapped within the SSH tunnel. wprintf(L"%s\n",CkMailManW_lastErrorText(mailman)); // How many messages are in the POP3 inbox? numToDownload = CkMailManW_GetMailboxCount(mailman); if (numToDownload > 5) { numToDownload = 5; } if (numToDownload == 0) { CkMailManW_Dispose(mailman); return; } // Download a max of 5 messages for (i = 1; i <= numToDownload; i++) { email = CkMailManW_FetchByMsgnum(mailman,i); if (CkMailManW_getLastMethodSuccess(mailman) == FALSE) { wprintf(L"%s\n",CkMailManW_lastErrorText(mailman)); CkMailManW_Dispose(mailman); return; } wprintf(L"%s\n",CkEmailW_ck_from(email)); wprintf(L"%s\n",CkEmailW_subject(email)); wprintf(L"----\n"); CkEmailW_Dispose(email); } // Close the connection with the POP3 server, leaving the SSH tunnel open for subsequent POP3 connections. success = CkMailManW_Pop3EndSession(mailman); if (success != TRUE) { wprintf(L"%s\n",CkMailManW_lastErrorText(mailman)); CkMailManW_Dispose(mailman); return; } // Try connecting to a different POP3 server through the same aleady setup SSH tunnel: // Set the POP3 server's hostname CkMailManW_putMailHost(mailman,L"mail.my-pop3-server2.com"); // Set the POP3 settings for your POP3 server: CkMailManW_putPopUsername(mailman,L"pop3_login2"); CkMailManW_putPopPassword(mailman,L"pop3_password2"); CkMailManW_putMailPort(mailman,110); CkMailManW_putPopSsl(mailman,FALSE); success = CkMailManW_Pop3BeginSession(mailman); if (success != TRUE) { wprintf(L"%s\n",CkMailManW_lastErrorText(mailman)); CkMailManW_Dispose(mailman); return; } // Review the LastErrorText to see that the connection was made via the SSH tunnel: wprintf(L"%s\n",CkMailManW_lastErrorText(mailman)); success = CkMailManW_Pop3EndSession(mailman); if (success != TRUE) { wprintf(L"%s\n",CkMailManW_lastErrorText(mailman)); CkMailManW_Dispose(mailman); return; } // Close the SSH tunnel. success = CkMailManW_SshCloseTunnel(mailman); if (success != TRUE) { wprintf(L"%s\n",CkMailManW_lastErrorText(mailman)); CkMailManW_Dispose(mailman); return; } CkMailManW_Dispose(mailman); } |
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