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libssh2/docs/libssh2_userauth_banner.md
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

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Markdown

---
c: Copyright (C) The libssh2 project and its contributors.
SPDX-License-Identifier: BSD-3-Clause
Title: libssh2_userauth_banner
Section: 3
Source: libssh2
See-also:
- libssh2_session_init_ex(3)
- libssh2_userauth_list(3)
---
# NAME
libssh2_userauth_banner - get the server's userauth banner message
# SYNOPSIS
~~~c
#include <libssh2.h>
int
libssh2_userauth_banner(LIBSSH2_SESSION *session, char **banner);
~~~
# DESCRIPTION
*session* - Session instance as returned by libssh2_session_init_ex(3)
*banner* - Should point to a pointer that gets filled with banner message.
After an authentication has been attempted, such as a
**SSH_USERAUTH_NONE** request sent by *libssh2_userauth_list(3)*
this function can be called to retrieve the userauth banner sent by
the server. If no such banner is sent, or if an authentication has not
yet been attempted, returns **LIBSSH2_ERROR_MISSING_USERAUTH_BANNER**.
# RETURN VALUE
On success returns 0 and an UTF-8 NUL-terminated string is stored in the
*banner*. This string is internally managed by libssh2 and will be
deallocated upon session termination.
On failure returns **LIBSSH2_ERROR_MISSING_USERAUTH_BANNER**.