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/*********************************************************************
* Copyright 2016, UCAR/Unidata
* See netcdf/COPYRIGHT file for copying and redistribution conditions.
*********************************************************************/
#include "d4includes.h"
#include "d4curlfunctions.h"
static size_t WriteFileCallback(void*, size_t, size_t, void*);
static size_t WriteMemoryCallback(void*, size_t, size_t, void*);
static int curlerrtoncerr(CURLcode cstat);
struct Fetchdata {
FILE* stream;
size_t size;
};
long
NCD4_fetchhttpcode(CURL* curl)
{
long httpcode = 200;
CURLcode cstat = CURLE_OK;
/* Extract the http code */
#ifdef HAVE_CURLINFO_RESPONSE_CODE
cstat = curl_easy_getinfo(curl,CURLINFO_RESPONSE_CODE,&httpcode);
#else
cstat = curl_easy_getinfo(curl,CURLINFO_HTTP_CONNECTCODE,&httpcode);
#endif
if(cstat != CURLE_OK) {
httpcode = 0;
nclog(NCLOGERR, "curl error: %s", curl_easy_strerror(cstat));
}
return httpcode;
}
int
NCD4_fetchurl_file(CURL* curl, const char* url, FILE* stream,
d4size_t* sizep, long* filetime)
{
int ret = NC_NOERR;
CURLcode cstat = CURLE_OK;
struct Fetchdata fetchdata;
/* Set the URL */
cstat = curl_easy_setopt(curl, CURLOPT_URL, (void*)url);
if (cstat != CURLE_OK) goto fail;
/* send all data to this function */
cstat = curl_easy_setopt(curl, CURLOPT_WRITEFUNCTION, WriteFileCallback);
if (cstat != CURLE_OK) goto fail;
/* we pass our file to the callback function */
cstat = curl_easy_setopt(curl, CURLOPT_WRITEDATA, (void *)&fetchdata);
if(cstat != CURLE_OK) goto fail;
/* One last thing; always try to get the last modified time */
cstat = curl_easy_setopt(curl, CURLOPT_FILETIME, (long)1);
if (cstat != CURLE_OK) goto fail;
fetchdata.stream = stream;
fetchdata.size = 0;
cstat = curl_easy_perform(curl);
if (cstat != CURLE_OK)
{ret = NC_EDAPSVC; goto fail;}
if (ret == NC_NOERR) {
/* return the file size*/
#ifdef D4DEBUG
nclog(NCLOGNOTE,"filesize: %lu bytes",fetchdata.size);
#endif
if (sizep != NULL)
*sizep = fetchdata.size;
/* Get the last modified time */
if(filetime != NULL)
cstat = curl_easy_getinfo(curl,CURLINFO_FILETIME,filetime);
if(cstat != CURLE_OK)
{ret = NC_ECURL; goto fail;}
}
return THROW(ret);
fail:
if(cstat != CURLE_OK) {
nclog(NCLOGERR, "curl error: %s", curl_easy_strerror(cstat));
ret = curlerrtoncerr(cstat);
}
return THROW(ret);
}
int
NCD4_fetchurl(CURL* curl, const char* url, NCbytes* buf, long* filetime)
{
int ret = NC_NOERR;
CURLcode cstat = CURLE_OK;
size_t len;
long httpcode = 0;
/* send all data to this function */
cstat = curl_easy_setopt(curl, CURLOPT_WRITEFUNCTION, WriteMemoryCallback);
if (cstat != CURLE_OK)
goto fail;
/* we pass our file to the callback function */
cstat = curl_easy_setopt(curl, CURLOPT_WRITEDATA, (void*)buf);
if (cstat != CURLE_OK)
goto fail;
/* One last thing; always try to get the last modified time */
cstat = curl_easy_setopt(curl, CURLOPT_FILETIME, (long)1);
/* Set the URL */
cstat = curl_easy_setopt(curl, CURLOPT_URL, (void*)"");
cstat = curl_easy_setopt(curl, CURLOPT_URL, (void*)url);
if (cstat != CURLE_OK)
goto fail;
cstat = curl_easy_perform(curl);
if(cstat == CURLE_PARTIAL_FILE) {
/* Log it but otherwise ignore */
nclog(NCLOGWARN, "curl error: %s; ignored",
curl_easy_strerror(cstat));
cstat = CURLE_OK;
}
httpcode = NCD4_fetchhttpcode(curl);
if(cstat != CURLE_OK) goto fail;
/* Get the last modified time */
if(filetime != NULL)
cstat = curl_easy_getinfo(curl,CURLINFO_FILETIME,filetime);
if(cstat != CURLE_OK) goto fail;
/* Null terminate the buffer*/
len = ncbyteslength(buf);
ncbytesappend(buf, '\0');
ncbytessetlength(buf, len); /* don't count null in buffer size*/
#ifdef D4DEBUG
nclog(NCLOGNOTE,"buffersize: %lu bytes",(d4size_t)ncbyteslength(buf));
#endif
return THROW(ret);
fail:
if(cstat != CURLE_OK) {
nclog(NCLOGERR, "curl error: %s", curl_easy_strerror(cstat));
ret = curlerrtoncerr(cstat);
} else switch (httpcode) {
case 401: ret = NC_EAUTH; break;
case 404: ret = ENOENT; break;
case 500: ret = NC_EDAPSVC; break;
case 200: break;
default: ret = NC_ECURL; break;
}
return THROW(ret);
}
static size_t
WriteFileCallback(void* ptr, size_t size, size_t nmemb, void* data)
{
size_t realsize = size * nmemb;
size_t count;
struct Fetchdata* fetchdata;
fetchdata = (struct Fetchdata*) data;
if(realsize == 0)
nclog(NCLOGWARN,"WriteFileCallback: zero sized chunk");
count = fwrite(ptr, size, nmemb, fetchdata->stream);
if (count > 0) {
fetchdata->size += (count * size);
} else {
nclog(NCLOGWARN,"WriteFileCallback: zero sized write");
}
#ifdef PROGRESS
nclog(NCLOGNOTE,"callback: %lu bytes",(d4size_t)realsize);
#endif
return count;
}
static size_t
WriteMemoryCallback(void *ptr, size_t size, size_t nmemb, void *data)
{
size_t realsize = size * nmemb;
NCbytes* buf = (NCbytes*) data;
if(realsize == 0)
nclog(NCLOGWARN,"WriteMemoryCallback: zero sized chunk");
/* Optimize for reading potentially large dods datasets */
if(!ncbytesavail(buf,realsize)) {
/* double the size of the packet */
ncbytessetalloc(buf,2*ncbytesalloc(buf));
}
ncbytesappendn(buf, ptr, realsize);
#ifdef PROGRESS
nclog(NCLOGNOTE,"callback: %lu bytes",(d4size_t)realsize);
#endif
return realsize;
}
int
NCD4_curlopen(CURL** curlp)
{
int ret = NC_NOERR;
CURLcode cstat = CURLE_OK;
CURL* curl;
/* initialize curl*/
curl = curl_easy_init();
if (curl == NULL)
ret = NC_ECURL;
else {
cstat = curl_easy_setopt(curl, CURLOPT_NOPROGRESS, 1);
if (cstat != CURLE_OK)
ret = NC_ECURL;
}
if (curlp)
*curlp = curl;
if(cstat != CURLE_OK) {
nclog(NCLOGERR, "curl error: %s", curl_easy_strerror(cstat));
ret = curlerrtoncerr(cstat);
}
return THROW(ret);
}
void
NCD4_curlclose(CURL* curl)
{
if (curl != NULL)
curl_easy_cleanup(curl);
}
int
NCD4_fetchlastmodified(CURL* curl, char* url, long* filetime)
{
int ret = NC_NOERR;
CURLcode cstat = CURLE_OK;
/* Set the URL */
cstat = curl_easy_setopt(curl, CURLOPT_URL, (void*)url);
if (cstat != CURLE_OK)
goto fail;
/* Ask for head */
cstat = curl_easy_setopt(curl, CURLOPT_TIMEOUT, 30); /* 30sec timeout*/
cstat = curl_easy_setopt(curl, CURLOPT_CONNECTTIMEOUT, 2);
cstat = curl_easy_setopt(curl, CURLOPT_HEADER, 1);
cstat = curl_easy_setopt(curl, CURLOPT_NOBODY, 1);
cstat = curl_easy_setopt(curl, CURLOPT_NOPROGRESS, 1);
cstat = curl_easy_setopt(curl, CURLOPT_FILETIME, (long)1);
cstat = curl_easy_perform(curl);
if(cstat != CURLE_OK) goto fail;
if(filetime != NULL)
cstat = curl_easy_getinfo(curl,CURLINFO_FILETIME,filetime);
if(cstat != CURLE_OK) goto fail;
return THROW(ret);
fail:
if(cstat != CURLE_OK) {
nclog(NCLOGERR, "curl error: %s", curl_easy_strerror(cstat));
ret = curlerrtoncerr(cstat);
}
return THROW(ret);
}
int
NCD4_ping(const char* url)
{
int ret = NC_NOERR;
CURLcode cstat = CURLE_OK;
CURL* curl = NULL;
NCbytes* buf = NULL;
/* Create a CURL instance */
ret = NCD4_curlopen(&curl);
if(ret != NC_NOERR) return THROW(ret);
/* Use redirects */
cstat = curl_easy_setopt(curl, CURLOPT_MAXREDIRS, 10L);
if (cstat != CURLE_OK)
goto done;
cstat = curl_easy_setopt(curl, CURLOPT_FOLLOWLOCATION, 1L);
if (cstat != CURLE_OK)
goto done;
/* use a very short timeout: 10 seconds */
cstat = curl_easy_setopt(curl, CURLOPT_TIMEOUT, (long)5);
if (cstat != CURLE_OK)
goto done;
/* fail on HTTP 400 code errors */
cstat = curl_easy_setopt(curl, CURLOPT_FAILONERROR, (long)1);
if (cstat != CURLE_OK)
goto done;
/* Try to get the file */
buf = ncbytesnew();
ret = NCD4_fetchurl(curl,url,buf,NULL);
if(ret == NC_NOERR) {
/* Don't trust curl to return an error when request gets 404 */
long http_code = 0;
cstat = curl_easy_getinfo(curl,CURLINFO_RESPONSE_CODE, &http_code);
if (cstat != CURLE_OK)
goto done;
if(http_code >= 400) {
cstat = CURLE_HTTP_RETURNED_ERROR;
goto done;
}
} else
goto done;
done:
ncbytesfree(buf);
NCD4_curlclose(curl);
if(cstat != CURLE_OK) {
nclog(NCLOGERR, "curl error: %s", curl_easy_strerror(cstat));
ret = curlerrtoncerr(cstat);
}
return THROW(ret);
}
static int
curlerrtoncerr(CURLcode cstat)
{
switch (cstat) {
case CURLE_OK: return THROW(NC_NOERR);
case CURLE_URL_MALFORMAT:
return THROW(NC_EURL);
case CURLE_COULDNT_RESOLVE_HOST:
case CURLE_COULDNT_CONNECT:
case CURLE_REMOTE_ACCESS_DENIED:
case CURLE_TOO_MANY_REDIRECTS:
return THROW(NC_EDAPSVC);
case CURLE_OUT_OF_MEMORY:
return THROW(NC_ENOMEM);
/* Eventually would be nice to convert these */
case CURLE_SSL_CONNECT_ERROR:
case CURLE_READ_ERROR:
case CURLE_OPERATION_TIMEDOUT:
case CURLE_SSL_CERTPROBLEM:
case CURLE_FILESIZE_EXCEEDED:
case CURLE_SSL_CACERT_BADFILE:
default: break;
}
return THROW(NC_ECURL);
}
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