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libssh2/docs/libssh2_knownhost_addc.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
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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

2.6 KiB

c, SPDX-License-Identifier, Title, Section, Source, See-also
c SPDX-License-Identifier Title Section Source See-also
Copyright (C) Daniel Stenberg BSD-3-Clause libssh2_knownhost_addc 3 libssh2
libssh2_knownhost_check(3)
libssh2_knownhost_free(3)
libssh2_knownhost_init(3)

NAME

libssh2_knownhost_addc - add a known host

SYNOPSIS

#include <libssh2.h>

int
libssh2_knownhost_addc(LIBSSH2_KNOWNHOSTS *hosts,
                       char *host, char *salt,
                       char *key, size_t keylen,
                       const char *comment, size_t commentlen,
                       int typemask,
                       struct libssh2_knownhost **store);

DESCRIPTION

Adds a known host to the collection of known hosts identified by the 'hosts' handle.

host is a pointer the host name in plain text or hashed. If hashed, it must be provided base64 encoded. The host name can be the IP numerical address of the host or the full name.

If you want to add a key for a specific port number for the given host, you must provide the host name like '[host]:port' with the actual characters '[' and ']' enclosing the host name and a colon separating the host part from the port number. For example: "[host.example.com]:222".

salt is a pointer to the salt used for the host hashing, if the host is provided hashed. If the host is provided in plain text, salt has no meaning. The salt has to be provided base64 encoded with a trailing zero byte.

key is a pointer to the key for the given host.

keylen is the total size in bytes of the key pointed to by the key argument

comment is a pointer to a comment for the key.

commentlen is the total size in bytes of the comment pointed to by the comment argument

typemask is a bitmask that specifies format and info about the data passed to this function. Specifically, it details what format the host name is, what format the key is and what key type it is.

The host name is given as one of the following types: LIBSSH2_KNOWNHOST_TYPE_PLAIN, LIBSSH2_KNOWNHOST_TYPE_SHA1 or LIBSSH2_KNOWNHOST_TYPE_CUSTOM.

The key is encoded using one of the following encodings: LIBSSH2_KNOWNHOST_KEYENC_RAW or LIBSSH2_KNOWNHOST_KEYENC_BASE64.

The key is using one of these algorithms: LIBSSH2_KNOWNHOST_KEY_RSA1, LIBSSH2_KNOWNHOST_KEY_SSHRSA or LIBSSH2_KNOWNHOST_KEY_SSHDSS (deprecated).

store should point to a pointer that gets filled in to point to the known host data after the addition. NULL can be passed if you do not care about this pointer.

RETURN VALUE

Returns a regular libssh2 error code, where negative values are error codes and 0 indicates success.

AVAILABILITY

Added in libssh2 1.2.5