libssh2_session_supported_algs(3)				  libssh2 manual				 libssh2_session_supported_algs(3)

NAME

       libssh2_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, libssh2_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 supported 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 num-
       ber, 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 ALSO

       libssh2_session_methods(3), libssh2_session_method_pref(3) libssh2_free(3)

libssh2 1.4.0							    23 Oct 2011 				 libssh2_session_supported_algs(3)