forked from Unidata/netcdf-c
/
ochttp.c
373 lines (324 loc) · 9.6 KB
/
ochttp.c
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/* Copyright 2009, UCAR/Unidata and OPeNDAP, Inc.
See the COPYRIGHT file for more information. */
#include "config.h"
#ifdef HAVE_UNISTD_H
#include <unistd.h>
#endif
#include "ocinternal.h"
#include "ocdebug.h"
#include "ochttp.h"
static size_t WriteFileCallback(void*, size_t, size_t, void*);
static size_t WriteMemoryCallback(void*, size_t, size_t, void*);
struct Fetchdata {
FILE* stream;
size_t size;
};
long
ocfetchhttpcode(CURL* curl)
{
long httpcode = 200;
CURLcode cstat = CURLE_OK;
/* Extract the http code */
#ifdef HAVE_CURLINFO_RESPONSE_CODE
cstat = CURLERR(curl_easy_getinfo(curl,CURLINFO_RESPONSE_CODE,&httpcode));
#else
cstat = curl_easy_getinfo(curl,CURLINFO_HTTP_CODE,&httpcode);
#endif
if(cstat != CURLE_OK) httpcode = 0;
return httpcode;
}
OCerror
ocfetchurl_file(CURL* curl, const char* url, FILE* stream,
off_t* sizep, long* filetime)
{
int stat = OC_NOERR;
CURLcode cstat = CURLE_OK;
struct Fetchdata fetchdata;
/* Set the URL */
cstat = CURLERR(curl_easy_setopt(curl, CURLOPT_URL, (void*)url));
if (cstat != CURLE_OK)
goto fail;
/* send all data to this function */
cstat = CURLERR(curl_easy_setopt(curl, CURLOPT_WRITEFUNCTION, WriteFileCallback));
if (cstat != CURLE_OK)
goto fail;
/* we pass our file to the callback function */
cstat = CURLERR(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 = CURLERR(curl_easy_setopt(curl, CURLOPT_FILETIME, (long)1));
if (cstat != CURLE_OK)
goto fail;
fetchdata.stream = stream;
fetchdata.size = 0;
cstat = CURLERR(curl_easy_perform(curl));
if (cstat != CURLE_OK)
goto fail;
if (stat == OC_NOERR) {
/* return the file size*/
#ifdef OCDEBUG
oclog(OCLOGNOTE,"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) goto fail;
}
return OCTHROW(stat);
fail:
nclog(NCLOGERR, "curl error: %s", curl_easy_strerror(cstat));
return OCTHROW(OC_ECURL);
}
OCerror
ocfetchurl(CURL* curl, const char* url, NCbytes* buf, long* filetime,
struct OCcredentials* creds)
{
OCerror stat = OC_NOERR;
CURLcode cstat = CURLE_OK;
size_t len;
long httpcode = 0;
/* Set the URL */
cstat = CURLERR(CURLERR(curl_easy_setopt(curl, CURLOPT_URL, (void*)url)));
if (cstat != CURLE_OK)
goto fail;
#if 0
if(creds != NULL && creds->password != NULL && creds->username != NULL) {
/* Set user and password */
#if defined (HAVE_CURLOPT_USERNAME) && defined (HAVE_CURLOPT_PASSWORD)
cstat = CURLERR(curl_easy_setopt(curl, CURLOPT_USERNAME, creds->username));
if (cstat != CURLE_OK)
goto fail;
cstat = CURLERR(curl_easy_setopt(curl, CURLOPT_PASSWORD, creds->password));
if (cstat != CURLE_OK)
goto fail;
#else
snprintf(tbuf,1023,"%s:%s",creds->username,creds->password);
cstat = CURLERR(curl_easy_setopt(curl, CURLOPT_USERPWD, tbuf));
if (cstat != CURLE_OK)
goto fail;
#endif
}
#endif
/* send all data to this function */
cstat = CURLERR(curl_easy_setopt(curl, CURLOPT_WRITEFUNCTION, WriteMemoryCallback));
if (cstat != CURLE_OK)
goto fail;
/* we pass our file to the callback function */
cstat = CURLERR(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 = CURLERR(curl_easy_setopt(curl, CURLOPT_FILETIME, (long)1));
cstat = CURLERR(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 = ocfetchhttpcode(curl);
if(cstat != CURLE_OK) goto fail;
/* Get the last modified time */
if(filetime != NULL)
cstat = CURLERR(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); /* dont count null in buffer size*/
#ifdef OCDEBUG
nclog(NCLOGNOTE,"buffersize: %lu bytes",(off_t)ncbyteslength(buf));
#endif
return OCTHROW(stat);
fail:
nclog(NCLOGERR, "curl error: %s", curl_easy_strerror(cstat));
switch (httpcode) {
case 401: stat = OC_EAUTH; break;
case 404: stat = OC_ENOFILE; break;
case 500: stat = OC_EDAPSVC; break;
case 200: break;
default: stat = OC_ECURL; break;
}
return OCTHROW(stat);
}
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 OCPROGRESS
nclog(NCLOGNOTE,"callback: %lu bytes",(off_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 OCPROGRESS
nclog(NCLOGNOTE,"callback: %lu bytes",(off_t)realsize);
#endif
return realsize;
}
#if 0
static void
assembleurl(DAPURL* durl, NCbytes* buf, int what)
{
encodeurltext(durl->url,buf);
if(what & WITHPROJ) {
ncbytescat(buf,"?");
encodeurltext(durl->projection,buf);
}
if(what & WITHSEL) encodeurltext(durl->selection,buf);
}
static char mustencode="";
static char hexchars[16] = {
'0', '1', '2', '3',
'4', '5', '6', '7',
'8', '9', 'a', 'b',
'c', 'd', 'e', 'f',
};
static void
encodeurltext(char* text, NCbytes* buf)
{
/* Encode the URL to handle illegal characters */
len = strlen(url);
encoded = ocmalloc(len*4+1); /* should never be larger than this*/
if(encoded==NULL) return;
p = url; q = encoded;
while((c=*p++)) {
if(strchr(mustencode,c) != NULL) {
char tmp[8];
int hex1, hex2;
hex1 = (c & 0x0F);
hex2 = (c & 0xF0) >> 4;
tmp[0] = '0'; tmp[1] = 'x';
tmp[2] = hexchars[hex2]; tmp[3] = hexchars[hex1];
tmp[4] = '\0';
ncbytescat(buf,tmp);
} else *q++ = (char)c;
}
}
#endif
OCerror
occurlopen(CURL** curlp)
{
int stat = OC_NOERR;
CURLcode cstat = CURLE_OK;
CURL* curl;
/* initialize curl*/
curl = curl_easy_init();
if (curl == NULL)
stat = OC_ECURL;
else {
cstat = CURLERR(curl_easy_setopt(curl, CURLOPT_NOPROGRESS, 1));
if (cstat != CURLE_OK)
stat = OC_ECURL;
}
if (curlp)
*curlp = curl;
return OCTHROW(stat);
}
void
occurlclose(CURL* curl)
{
if (curl != NULL)
curl_easy_cleanup(curl);
}
OCerror
ocfetchlastmodified(CURL* curl, char* url, long* filetime)
{
int stat = OC_NOERR;
CURLcode cstat = CURLE_OK;
/* Set the URL */
cstat = CURLERR(curl_easy_setopt(curl, CURLOPT_URL, (void*)url));
if (cstat != CURLE_OK)
goto fail;
/* Ask for head */
cstat = CURLERR(curl_easy_setopt(curl, CURLOPT_TIMEOUT, 30)); /* 30sec timeout*/
cstat = CURLERR(curl_easy_setopt(curl, CURLOPT_CONNECTTIMEOUT, 2));
cstat = CURLERR(curl_easy_setopt(curl, CURLOPT_HEADER, 1));
cstat = CURLERR(curl_easy_setopt(curl, CURLOPT_NOBODY, 1));
cstat = CURLERR(curl_easy_setopt(curl, CURLOPT_NOPROGRESS, 1));
cstat = CURLERR(curl_easy_setopt(curl, CURLOPT_FILETIME, (long)1));
cstat = CURLERR(curl_easy_perform(curl));
if(cstat != CURLE_OK) goto fail;
if(filetime != NULL)
cstat = CURLERR(curl_easy_getinfo(curl,CURLINFO_FILETIME,filetime));
if(cstat != CURLE_OK) goto fail;
return OCTHROW(stat);
fail:
nclog(NCLOGERR, "curl error: %s", curl_easy_strerror(cstat));
return OCTHROW(OC_ECURL);
}
OCerror
ocping(const char* url)
{
int stat = OC_NOERR;
CURLcode cstat = CURLE_OK;
CURL* curl = NULL;
NCbytes* buf = NULL;
/* Create a CURL instance */
stat = occurlopen(&curl);
if(stat != OC_NOERR) return stat;
/* Use redirects */
cstat = CURLERR(curl_easy_setopt(curl, CURLOPT_MAXREDIRS, 10L));
if (cstat != CURLE_OK)
goto done;
cstat = CURLERR(curl_easy_setopt(curl, CURLOPT_FOLLOWLOCATION, 1L));
if (cstat != CURLE_OK)
goto done;
/* use a very short timeout: 10 seconds */
cstat = CURLERR(curl_easy_setopt(curl, CURLOPT_TIMEOUT, (long)5));
if (cstat != CURLE_OK)
goto done;
/* fail on HTTP 400 code errors */
cstat = CURLERR(curl_easy_setopt(curl, CURLOPT_FAILONERROR, (long)1));
if (cstat != CURLE_OK)
goto done;
/* Try to get the file */
buf = ncbytesnew();
stat = ocfetchurl(curl,url,buf,NULL,NULL);
if(stat == OC_NOERR) {
/* Don't trust curl to return an error when request gets 404 */
long http_code = 0;
cstat = CURLERR(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);
occurlclose(curl);
if(cstat != CURLE_OK) {
nclog(NCLOGERR, "curl error: %s", curl_easy_strerror(cstat));
stat = OC_EDAPSVC;
}
return OCTHROW(stat);
}