Hello everyone,
I work on Linux #astra31+ci49-Ubuntu with GNU/Linux.
On my system installed curl 7.68.0 (x86_64-pc-linux-gnu) libcurl/7.68.0
OpenSSL/1.1.1k zlib/1.2.11 brotli/1.0.7 libidn2/2.0.5 libpsl/0.20.2
(+libidn2/2.0.5) libssh2/1.11.0 nghttp2/1.36.0 librtmp/2.3.
From this system I can get the data from some device usung console request to
the private https server via the curl command:
curl -k -X GET -H 'Authorization: Bearer nokey'
https://<IP-address>:<port>/api/ccu/online
This command requests the device-IDs, connected to this server
As a response to this command I got data in JSON-format, that represents real
data from selected device:
["860621065932826"]
This number represents the device-ID of connected device.
I would like to create a programm on base of C-examples from your site, using
the calls of the libcurl, which could perform the same task as the console curl
command mentioned above.
This is the text of my C-programm, having the name curl_example.c:
#include <stdio.h>
#include <stdlib.h>
#include <unistd.h>
#include <curl/curl.h>
#include <curl/easy.h>
static size_t write_data(void *ptr, size_t size, size_t nmemb, FILE* data)
{
int written = fwrite(ptr, size, nmemb, data);
printf("write_data: was written %i bytes into the file %s\n", written, data);
return written;
}
int main(void)
{
CURL *curl_handle;
// Open files for the header and the body
static const char *headerfilename = "head.txt";
static const char *bodyfilename = "body.html";
CURLcode Ret;
FILE *header_file = fopen(headerfilename, "w");
if (header_file == NULL)
{
printf("Can't open %s header_file", headerfilename);
return -1;
}
FILE *body_file = fopen(bodyfilename, "w");
if (body_file == NULL)
{
printf("Can't open %s body_file", bodyfilename);
return -1;
}
curl_global_init(CURL_GLOBAL_ALL);
/* curl session ininializatio */
curl_handle = curl_easy_init();
if (!curl_handle)
{
printf("Error after curl_easy_init, curl_handle=%l\n", curl_handle);
return -1;
}
/* setup URL */
Ret = curl_easy_setopt(curl_handle, CURLOPT_URL,
"https://172.16.30.13:8443/api/ccu/online";);
if (Ret != CURLE_OK)
{
printf("Error %i after curl_easy_setopt CURLOPT_URL\n", Ret);
curl_easy_cleanup(curl_handle);
return -1;
}
/* set authentification */
Ret = curl_easy_setopt(curl_handle, CURLOPT_HTTPAUTH, CURLAUTH_BEARER);
if (Ret != CURLE_OK)
{
printf("Error %i after curl_easy_setopt CURLOPT_HTTPAUTH\n", Ret);
curl_easy_cleanup(curl_handle);
return -1;
}
Ret = curl_easy_setopt(curl_handle, CURLOPT_XOAUTH2_BEARER, "nokey");
if (Ret != CURLE_OK)
{
printf("Error %i after curl_easy_setopt CURLOPT_XOAUTH2_BEARER\n", Ret);
curl_easy_cleanup(curl_handle);
return -1;
}
/* perform GET request */
Ret = curl_easy_setopt(curl_handle, CURLOPT_HTTPGET, 1L);
if (Ret != CURLE_OK)
{
printf("Error %i after curl_easy_setopt CURLOPT_HTTPGET\n", Ret);
curl_easy_cleanup(curl_handle);
return -1;
}
/* no progress meter please */
Ret = curl_easy_setopt(curl_handle, CURLOPT_NOPROGRESS, 1L);
if (Ret != CURLE_OK)
{
printf("Error %i after curl_easy_setopt CURLOPT_NOPROGRESS\n", Ret);
curl_easy_cleanup(curl_handle);
return -1;
}
/* declare write_data as callback */
Ret = curl_easy_setopt(curl_handle, CURLOPT_WRITEFUNCTION, write_data);
if (Ret != CURLE_OK)
{
printf("Error %i after curl_easy_setopt CURLOPT_WRITEFUNCTION\n", Ret);
curl_easy_cleanup(curl_handle);
return -1;
}
/* save the body */
Ret = curl_easy_setopt(curl_handle, CURLOPT_WRITEDATA, body_file);
if (Ret != CURLE_OK)
{
printf("Error %i after curl_easy_setopt CURLOPT_WRITEDATA\n", Ret);
curl_easy_cleanup(curl_handle);
return -1;
}
// save the header
Ret = curl_easy_setopt(curl_handle, CURLOPT_HEADERDATA, header_file);
if (Ret != CURLE_OK)
{
printf("Error %i after curl_easy_setopt CURLOPT_HEADERDATA\n", Ret);
curl_easy_cleanup(curl_handle);
return -1;
}
/* get it! */
Ret = curl_easy_perform(curl_handle);
if (Ret != CURLE_OK)
{
printf("Error %i after curl_easy_perform\n", Ret);
curl_easy_cleanup(curl_handle);
return -1;
}
/* close the header file */
fclose(header_file);
/* close the body file */
fclose(body_file);
/* cleanup curl stuff */
curl_easy_cleanup(curl_handle);
printf("\nDone!\n");
getchar();
return 0;
}
Excuse me, that I put here whole text, becase I really don’t know, where could
be a mistake.
I compiled the programm with command:
gcc -o curl_example curl_example.c -lcurl
and then started it putting as command
./curl_example
End, finally I got error message:
Error 60 after curl_easy_perform
Here is an explanation:
CURLE_PEER_FAILED_VERIFICATION, /* 60 - peer's certificate or fingerprint
wasn't verified fine */
I am a novice in programing in this area. What I did incorrectly and how it
should be done?
Thanks in advance!
--
Vladislav Korobov
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