99 lines
2.2 KiB
Markdown
99 lines
2.2 KiB
Markdown
|
---
|
||
|
|
c: Copyright (C) Daniel Stenberg, <daniel.se>, et al.
|
||
|
|
SPDX-License-Identifier: curl
|
||
|
|
Title: CURLOPT_SSH_HOSTKEYFUNCTION
|
||
|
|
Section: 3
|
||
|
|
Source: libcurl
|
||
|
|
See-also:
|
||
|
|
- CURLOPT_SSH_HOSTKEYDATA (3)
|
||
|
|
- CURLOPT_SSH_KNOWNHOSTS (3)
|
||
|
|
---
|
||
|
|
|
||
|
|
# NAME
|
||
|
|
|
||
|
|
CURLOPT_SSH_HOSTKEYFUNCTION - callback to check host key
|
||
|
|
|
||
|
|
# SYNOPSIS
|
||
|
|
|
||
|
|
~~~c
|
||
|
|
#include <curl/curl.h>
|
||
|
|
|
||
|
|
int keycallback(void *clientp,
|
||
|
|
int keytype,
|
||
|
|
const char *key,
|
||
|
|
size_t keylen);
|
||
|
|
|
||
|
|
CURLcode curl_easy_setopt(CURL *handle, CURLOPT_SSH_HOSTKEYFUNCTION,
|
||
|
|
keycallback);
|
||
|
|
~~~
|
||
|
|
|
||
|
|
# DESCRIPTION
|
||
|
|
|
||
|
|
Pass a pointer to your callback function, which should match the prototype
|
||
|
|
shown above. It overrides CURLOPT_SSH_KNOWNHOSTS(3).
|
||
|
|
|
||
|
|
This callback gets called when the verification of the SSH host key is needed.
|
||
|
|
|
||
|
|
**key** is **keylen** bytes long and is the key to check. **keytype**
|
||
|
|
says what type it is, from the **CURLKHTYPE_*** series in the
|
||
|
|
**curl_khtype** enum.
|
||
|
|
|
||
|
|
**clientp** is a custom pointer set with CURLOPT_SSH_HOSTKEYDATA(3).
|
||
|
|
|
||
|
|
The callback MUST return one of the following return codes to tell libcurl how
|
||
|
|
to act:
|
||
|
|
|
||
|
|
## CURLKHMATCH_OK
|
||
|
|
|
||
|
|
The host key is accepted, the connection should continue.
|
||
|
|
|
||
|
|
## CURLKHMATCH_MISMATCH
|
||
|
|
|
||
|
|
the host key is rejected, the connection is canceled.
|
||
|
|
|
||
|
|
# DEFAULT
|
||
|
|
|
||
|
|
NULL
|
||
|
|
|
||
|
|
# PROTOCOLS
|
||
|
|
|
||
|
|
SCP and SFTP
|
||
|
|
|
||
|
|
# EXAMPLE
|
||
|
|
|
||
|
|
~~~c
|
||
|
|
struct mine {
|
||
|
|
void *custom;
|
||
|
|
};
|
||
|
|
|
||
|
|
int hostkeycb(void *clientp, /* passed with CURLOPT_SSH_HOSTKEYDATA */
|
||
|
|
int keytype, /* CURLKHTYPE */
|
||
|
|
const char *key, /* host key to check */
|
||
|
|
size_t keylen) /* length of the key */
|
||
|
|
{
|
||
|
|
/* 'clientp' points to the callback_data struct */
|
||
|
|
/* investigate the situation and return the correct value */
|
||
|
|
return CURLKHMATCH_OK;
|
||
|
|
}
|
||
|
|
int main(void)
|
||
|
|
{
|
||
|
|
struct mine callback_data;
|
||
|
|
CURL *curl = curl_easy_init();
|
||
|
|
if(curl) {
|
||
|
|
curl_easy_setopt(curl, CURLOPT_URL, "sftp://example.com/thisfile.txt");
|
||
|
|
curl_easy_setopt(curl, CURLOPT_SSH_HOSTKEYFUNCTION, hostkeycb);
|
||
|
|
curl_easy_setopt(curl, CURLOPT_SSH_HOSTKEYDATA, &callback_data);
|
||
|
|
|
||
|
|
curl_easy_perform(curl);
|
||
|
|
}
|
||
|
|
}
|
||
|
|
~~~
|
||
|
|
|
||
|
|
# AVAILABILITY
|
||
|
|
|
||
|
|
Added in 7.84.0 , work only with libssh2 backend.
|
||
|
|
|
||
|
|
# RETURN VALUE
|
||
|
|
|
||
|
|
Returns CURLE_OK if the option is supported, and CURLE_UNKNOWN_OPTION if not.
|