libssh2_channel_write_ex(3) libssh2 manual libssh2_channel_write_ex(3)NAME
libssh2_channel_write_ex - write data to a channel stream blocking
SYNOPSIS
#include <libssh2.h>
ssize_t libssh2_channel_write_ex(LIBSSH2_CHANNEL *channel,
int stream_id, char *buf,
size_t buflen);
DESCRIPTION
Write data to a channel stream. All channel streams have one standard I/O substream (stream_id == 0), and may have up to 2^32 extended data
streams as identified by the selected stream_id. The SSH2 protocol currently defines a stream ID of 1 to be the stderr substream.
channel - active channel stream to write to.
stream_id - substream ID number (e.g. 0 or SSH_EXTENDED_DATA_STDERR)
buf - pointer to buffer to write
buflen - size of the data to write
libssh2_channel_write(3) and libssh2_channel_write_stderr(3) are convenience macros for this function.
libssh2_channel_write_ex(3) will use as much as possible of the buffer and put it into a single SSH protocol packet. This means that to get
maximum performance when sending larger files, you should try to always pass in at least 32K of data to this function.
RETURN VALUE
Actual number of bytes written or negative on failure. LIBSSH2_ERROR_EAGAIN when it would otherwise block. While LIBSSH2_ERROR_EAGAIN is a
negative number, it isn't really a failure per se.
ERRORS
LIBSSH2_ERROR_ALLOC - An internal memory allocation call failed.
LIBSSH2_ERROR_SOCKET_SEND - Unable to send data on socket.
LIBSSH2_ERROR_CHANNEL_CLOSED - The channel has been closed.
LIBSSH2_ERROR_CHANNEL_EOF_SENT - The channel has been requested to be closed.
SEE ALSO libssh2_channel_open_ex(3)libssh2_channel_read_ex(3)libssh2 0.15 1 Jun 2007 libssh2_channel_write_ex(3)
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libssh2_userauth_password_ex(3) libssh2 manual libssh2_userauth_password_ex(3)NAME
libssh2_userauth_password_ex - authenticate a session with username and password
SYNOPSIS
#include <libssh2.h>
int libssh2_userauth_password_ex(LIBSSH2_SESSION *session,
const char *username,
unsigned int username_len,
const char *password,
unsigned int password_len,
LIBSSH2_PASSWD_CHANGEREQ_FUNC((*passwd_change_cb)));
#define libssh2_userauth_password(session, username, password)
libssh2_userauth_password_ex((session), (username),
strlen(username),
(password), strlen(password), NULL)
DESCRIPTION
session - Session instance as returned by libssh2_session_init_ex(3)
username - Name of user to attempt plain password authentication for.
username_len - Length of username parameter.
password - Password to use for authenticating username.
password_len - Length of password parameter.
passwd_change_cb - If the host accepts authentication but requests that the password be changed, this callback will be issued. If no call-
back is defined, but server required password change, authentication will fail.
Attempt basic password authentication. Note that many SSH servers which appear to support ordinary password authentication actually have it
disabled and use Keyboard Interactive authentication (routed via PAM or another authentication backed) instead.
RETURN VALUE
Return 0 on success or negative on failure. It returns LIBSSH2_ERROR_EAGAIN when it would otherwise block. While LIBSSH2_ERROR_EAGAIN is a
negative number, it isn't really a failure per se.
ERRORS
Some of the errors this function may return include:
LIBSSH2_ERROR_ALLOC - An internal memory allocation call failed.
LIBSSH2_ERROR_SOCKET_SEND - Unable to send data on socket.
LIBSSH2_ERROR_PASSWORD_EXPIRED -
IBSSH2_ERROR_AUTHENTICATION_FAILED - failed, invalid username/password or public/private key.
SEE ALSO libssh2_session_init_ex(3)libssh2 0.15 1 Jun 2007 libssh2_userauth_password_ex(3)