97 lines
3.2 KiB
Groff
97 lines
3.2 KiB
Groff
.\" **************************************************************************
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.\" * _ _ ____ _
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.\" * Project ___| | | | _ \| |
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.\" * / __| | | | |_) | |
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.\" * | (__| |_| | _ <| |___
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.\" * \___|\___/|_| \_\_____|
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.\" *
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.\" * Copyright (C) Daniel Stenberg, <daniel@haxx.se>, et al.
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.\" *
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.\" * This software is licensed as described in the file COPYING, which
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.\" * you should have received as part of this distribution. The terms
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.\" * are also available at https://curl.se/docs/copyright.html.
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.\" *
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.\" * You may opt to use, copy, modify, merge, publish, distribute and/or sell
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.\" * copies of the Software, and permit persons to whom the Software is
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.\" * furnished to do so, under the terms of the COPYING file.
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.\" *
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.\" * This software is distributed on an "AS IS" basis, WITHOUT WARRANTY OF ANY
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.\" * KIND, either express or implied.
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.\" *
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.\" * SPDX-License-Identifier: curl
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.\" *
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.\" **************************************************************************
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.\"
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.TH CURLOPT_SSH_HOSTKEYFUNCTION 3 "4 Nov 2021" libcurl libcurl
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.SH NAME
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CURLOPT_SSH_HOSTKEYFUNCTION \- callback to check host key
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.SH SYNOPSIS
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.nf
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#include <curl/curl.h>
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int keycallback(void *clientp,
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int keytype,
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const char *key,
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size_t keylen);
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CURLcode curl_easy_setopt(CURL *handle, CURLOPT_SSH_HOSTKEYFUNCTION,
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keycallback);
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.fi
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.SH DESCRIPTION
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Pass a pointer to your callback function, which should match the prototype
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shown above. It overrides \fICURLOPT_SSH_KNOWNHOSTS(3)\fP.
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This callback gets called when the verification of the SSH host key is needed.
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\fBkey\fP is \fBkeylen\fP bytes long and is the key to check. \fBkeytype\fP
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says what type it is, from the \fBCURLKHTYPE_*\fP series in the
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\fBcurl_khtype\fP enum.
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\fBclientp\fP is a custom pointer set with \fICURLOPT_SSH_HOSTKEYDATA(3)\fP.
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The callback MUST return one of the following return codes to tell libcurl how
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to act:
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.IP CURLKHMATCH_OK
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The host key is accepted, the connection should continue.
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.IP CURLKHMATCH_MISMATCH
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the host key is rejected, the connection is canceled.
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.SH DEFAULT
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NULL
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.SH PROTOCOLS
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SCP and SFTP
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.SH EXAMPLE
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.nf
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struct mine {
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void *custom;
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};
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int hostkeycb(void *clientp, /* passed with CURLOPT_SSH_HOSTKEYDATA */
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int keytype, /* CURLKHTYPE */
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const char *key, /* host key to check */
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size_t keylen) /* length of the key */
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{
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/* 'clientp' points to the callback_data struct */
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/* investigate the situation and return the correct value */
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return CURLKHMATCH_OK;
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}
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int main(void)
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{
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struct mine callback_data;
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CURL *curl = curl_easy_init();
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if(curl) {
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curl_easy_setopt(curl, CURLOPT_URL, "sftp://example.com/thisfile.txt");
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curl_easy_setopt(curl, CURLOPT_SSH_HOSTKEYFUNCTION, hostkeycb);
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curl_easy_setopt(curl, CURLOPT_SSH_HOSTKEYDATA, &callback_data);
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curl_easy_perform(curl);
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}
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}
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.fi
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.SH AVAILABILITY
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Added in 7.84.0 , work only with libssh2 backend.
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.SH RETURN VALUE
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Returns CURLE_OK if the option is supported, and CURLE_UNKNOWN_OPTION if not.
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.SH "SEE ALSO"
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.BR CURLOPT_SSH_HOSTKEYDATA (3),
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.BR CURLOPT_SSH_KNOWNHOSTS (3)
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