mirror of https://github.com/libssh2/libssh2.git synced 2025-10-24 14:53:03 +03:00

Files

Viktor Szakats b889b39945 docs: convert man page sources to "curldown" format

To render in Git webviews as-is, to make it easier to edit, verify,
and to sync up with curl.

- add options to not build the `.3` man pages:
  - autotools: `--disable-docs`
  - cmake: `LIBSSH2_BUILD_DOCS=OFF`
- building `.3` man pages requires Perl after this patch.
- drop `mansyntax` and the shell / `grep` / GNU `man` tool requirements with it.
- scripts and most logic were copied from curl.
- add `cd2nroff` from curl, with edits to relax curl-specific checks.
- used `nroff2cd` (from curl) to convert from `.3` to `.md`. Then
  manually fixed copyrights, inline function references and a couple
  of other things.

Credits-to: Daniel Stenberg

Ref: eefcc1bda4
Ref: https://github.com/curl/curl/pull/12730
Ref: https://github.com/libssh2/www/issues/25#issuecomment-3289431671

Closes #1660

2025-10-09 04:05:38 +02:00

2.7 KiB

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c, SPDX-License-Identifier, Title, Section, Source, See-also

SPDX-License-Identifier

Title

Section

Source

See-also

BSD-3-Clause

libssh2_session_supported_algs

libssh2

libssh2_free(3)

libssh2_session_method_pref(3)

libssh2_session_methods(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 libssh2_session_method_pref(3). algs - Address of a pointer that will point to an array of returned algorithms

Get a list of supported algorithms for the given method_type. The method_type parameter is equivalent to method_type in libssh2_session_method_pref(3). If successful, the function will allocate the appropriate amount of memory. When not needed anymore, it must be deallocated 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;

/* initialize 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:\n");
    for(i = 0; i < rc; i++)
        printf("\t%s\n", 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

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