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Daniel Stenberg e3fe020089

docs/libcurl: generate PROTOCOLS from meta-data

Remove the PROTOCOLS section from the source files completely and
instead generate them based on the header data in the curldown files.

It also generates TLS backend information for options marked for TLS as
protocol.

Closes #13175

2024-03-23 18:13:03 +01:00

2.2 KiB

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SPDX-License-Identifier

Title

Section

Source

See-also

Protocol

curl

CURLOPT_SSH_HOSTKEYFUNCTION

libcurl

CURLOPT_SSH_HOSTKEYDATA (3)

CURLOPT_SSH_KNOWNHOSTS (3)

SFTP

SCP

NAME

CURLOPT_SSH_HOSTKEYFUNCTION - callback to check host key

SYNOPSIS

#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

EXAMPLE

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.

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