.TH libssh2_userauth_keyboard_interactive_ex 3 "8 Mar 2008" "libssh2 0.19" "libssh2 manual".SH NAMElibssh2_userauth_keyboard_interactive_ex - authenticate a session usingkeyboard-interactive authentication.SH SYNOPSIS.nf#include <libssh2.h> intlibssh2_userauth_keyboard_interactive_ex(LIBSSH2_SESSION *session,                                         const char *username,                                         unsigned int username_len,            LIBSSH2_USERAUTH_KBDINT_RESPONSE_FUNC(*response_callback));.SH DESCRIPTION\fIsession\fP - Session instance as returned by\fIlibssh2_session_init_ex(3)\fP. \fIusername\fP - Name of user to attempt keyboard-interactive authenticationfor. \fIusername_len\fP - Length of username parameter. \fIresponse_callback\fP - As authentication proceeds, the host issues several(1 or more) challenges and requires responses. This callback will be called atthis moment. The callback is responsible to obtain responses for thechallenges, fill the provided data structure and then returncontrol. Responses will be sent to the host. String values will be free(3)edby the library. The callback prototype must match this: .nf void response(const char *name,               int name_len, const char *instruction,               int instruction_len,               int num_prompts,               const LIBSSH2_USERAUTH_KBDINT_PROMPT *prompts,               LIBSSH2_USERAUTH_KBDINT_RESPONSE *responses,               void **abstract);.fi Attempts keyboard-interactive (challenge/response) authentication. Note that many SSH servers will always issue a single "password" challenge,requesting actual password as response, but it is not required by theprotocol, and various authentication schemes, such as smartcard authenticationmay use keyboard-interactive authentication type too..SH RETURN VALUEReturn 0 on success or negative on failure.  It returns LIBSSH2_ERROR_EAGAINwhen it would otherwise block. While LIBSSH2_ERROR_EAGAIN is a negativenumber, it isn't really a failure per se..SH ERRORS\fILIBSSH2_ERROR_ALLOC\fP -  An internal memory allocation call failed. \fILIBSSH2_ERROR_SOCKET_SEND\fP - Unable to send data on socket. \fLIBSSH2_ERROR_AUTHENTICATION_FAILED\fP - failed, invalid username/passwordor public/private key..SH SEE ALSO.BR libssh2_session_init_ex(3)