libssh2_session_supported_algs(3libssh2 manualibssh2_session_supported_algs(3)NAMElibssh2_session_supported_algs - get list of supported algorithms
SYNOPSIS
#include <libssh2.h>
int libssh2_session_supported_algs(LIBSSH2_SESSION* session,
int method_type,
const char*** algs);
DESCRIPTION
session - An instance of initialized LIBSSH2_SESSION (the function will
use its pointer to the memory allocation function). method_type -
Method type. See .BR libssh2_session_method_pref(3). algs - Address of
a pointer that will point to an array af returned algorithms
Get a list of supported algorithms for the given method_type. The
method_type parameter is equivalent to method_type in libssh2_ses‐
sion_method_pref(3). If successful, the function will allocate the
appropriate amount of memory. When not needed anymore, it must be deal‐
located by calling libssh2_free(3). When this function is unsuccessful,
this must not be done.
In order to get a list of all supported compression algorithms, lib‐
ssh2_session_flag(session, LIBSSH2_FLAG_COMPRESS, 1) must be called
before calling this function, otherwise only "none" will be returned.
If successful, the function will allocate and fill the array with sup‐
ported algorithms (the same names as defined in RFC 4253). The array
is not NULL terminated.
EXAMPLE
#include "libssh2.h"
const char **algorithms;
int rc, i;
LIBSSH2_SESSION *session;
/* initilize session */
session = libssh2_session_init();
rc = libssh2_session_supported_algs(session,
LIBSSH2_METHOD_CRYPT_CS,
&algorithms);
if (rc>0) {
/* the call succeeded, do sth. with the list of algorithms
(e.g. list them)... */
printf("Supported symmetric algorithms:0);
for ( i=0; i<rc; i++ )
printf("%s0, algorithms[i]);
/* ... and free the allocated memory when not needed anymore */
libssh2_free(session, algorithms);
}
else {
/* call failed, error handling */
}
RETURN VALUE
On success, a number of returned algorithms (i.e a positive number will
be returned). In case of a failure, an error code (a negative number,
see below) is returned. 0 should never be returned.
ERRORS
LIBSSH2_ERROR_BAD_USE - Invalid address of algs.
LIBSSH2_ERROR_METHOD_NOT_SUPPORTED - Unknown method type.
LIBSSH2_ERROR_INVAL - Internal error (normally should not occur).
LIBSSH2_ERROR_ALLOC - Allocation of memory failed.
AVAILABILITY
Added in 1.4.0
SEE ALSOlibssh2_session_methods(3), libssh2_session_method_pref(3) lib‐
ssh2_free(3)libssh2 1.4.0 23 Oct 2011libssh2_session_supported_algs(3)
