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Remote config files

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Config parser can now read config files stored remotely via
https/http/ftp. Requires libcurl.
This commit is contained in:
ystarnaud 2014-07-01 00:51:54 -04:00
parent 1c2de13498
commit 6f8d38ee11
1 changed files with 90 additions and 0 deletions
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90
config_parser.c
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@ -52,6 +52,10 @@
#include <sys/wait.h>
#endif
#ifdef HAVE_LIBCURL
#include <curl/curl.h>
#endif
char *cnfbuf = NULL; //config file loaded
int fileconf_load; //config file load status
const char def_conf[] = "sgminer.conf";
@ -490,6 +494,82 @@ static struct opt_table *opt_find(struct opt_table *tbl, char *optname)
return NULL;
}
/**************************************
* Remote Config Functions (Curl Only)
**************************************/
#ifdef HAVE_LIBCURL
struct remote_config {
const char *filename;
FILE *stream;
};
//curl file data write callback
static size_t fetch_remote_config_cb(void *buffer, size_t size, size_t nmemb, void *stream)
{
struct remote_config *out = (struct remote_config *)stream;
//create file if not created
if(out && !out->stream)
{
if(!(out->stream = fopen(out->filename, "w+")))
return -1;
}
return fwrite(buffer, size, nmemb, out->stream);
}
//download remote config file - return filename on success or NULL on failure
static char *fetch_remote_config(const char *url)
{
CURL *curl;
CURLcode res;
char *p;
struct remote_config file = { "", NULL };
//get filename out of url
if((p = strrchr(url, '/')) == NULL)
{
applog(LOG_ERR, "Fetch remote file failed: Invalid URL");
return NULL;
}
file.filename = p+1;
//check for empty filename
if(file.filename[0] == '\0')
{
applog(LOG_ERR, "Fetch remote file failed: Invalid Filename");
return NULL;
}
//init curl
if((curl = curl_easy_init()) == NULL)
{
applog(LOG_ERR, "Fetch remote file failed: curl init failed.");
return NULL;
}
//https stuff - skip verification we just want the data
if(strstr(url, "https") != NULL)
curl_easy_setopt(curl, CURLOPT_SSL_VERIFYPEER, 0L);
//set url
curl_easy_setopt(curl, CURLOPT_URL, url);
//set write callback and fileinfo
curl_easy_setopt(curl, CURLOPT_WRITEFUNCTION, fetch_remote_config_cb);
curl_easy_setopt(curl, CURLOPT_WRITEDATA, &file);
if((res = curl_easy_perform(curl)) != CURLE_OK)
applog(LOG_ERR, "Fetch remote file failed: %s", curl_easy_strerror(res));
if(file.stream)
fclose(file.stream);
curl_easy_cleanup(curl);
return (char *)((res == CURLE_OK)?file.filename:NULL);
}
#endif
/***************************************
* Config Parsing Functions
@ -633,6 +713,16 @@ char *load_config(const char *arg, const char *parentkey, void __maybe_unused *u
json_error_t err;
json_t *config;
#ifdef HAVE_LIBCURL
//if detected as url
if((strstr(arg, "http://") != NULL) || (strstr(arg, "https://") != NULL) || (strstr(arg, "ftp://") != NULL))
{
//download config file locally and reset arg to it so we can parse it
if((arg = fetch_remote_config(arg)) == NULL)
return NULL;
}
#endif
//most likely useless but leaving it here for now...
if(!cnfbuf)
cnfbuf = strdup(arg);