mirror of
https://github.com/Unidata/netcdf-c.git
synced 2024-12-21 08:39:46 +08:00
350 lines
8.8 KiB
C
350 lines
8.8 KiB
C
/* Copyright 2009, UCAR/Unidata and OPeNDAP, Inc.
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See the COPYRIGHT file for more information. */
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#include "config.h"
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#ifdef HAVE_UNISTD_H
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#include <unistd.h>
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#endif
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#include "ocinternal.h"
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#include "ocdebug.h"
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#include "ochttp.h"
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static size_t WriteFileCallback(void*, size_t, size_t, void*);
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static size_t WriteMemoryCallback(void*, size_t, size_t, void*);
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struct Fetchdata {
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FILE* stream;
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size_t size;
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};
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long
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ocfetchhttpcode(CURL* curl)
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{
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long httpcode = 200;
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CURLcode cstat = CURLE_OK;
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/* Extract the http code */
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cstat = CURLERR(curl_easy_getinfo(curl,CURLINFO_RESPONSE_CODE,&httpcode));
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if(cstat != CURLE_OK) httpcode = 0;
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return httpcode;
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}
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OCerror
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ocfetchurl_file(CURL* curl, const char* url, FILE* stream,
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off_t* sizep, long* filetime)
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{
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int stat = OC_NOERR;
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CURLcode cstat = CURLE_OK;
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struct Fetchdata fetchdata;
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/* Set the URL */
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cstat = CURLERR(curl_easy_setopt(curl, CURLOPT_URL, (void*)url));
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if (cstat != CURLE_OK)
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goto fail;
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/* send all data to this function */
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cstat = CURLERR(curl_easy_setopt(curl, CURLOPT_WRITEFUNCTION, WriteFileCallback));
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if (cstat != CURLE_OK)
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goto fail;
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/* we pass our file to the callback function */
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cstat = CURLERR(curl_easy_setopt(curl, CURLOPT_WRITEDATA, (void *)&fetchdata));
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if (cstat != CURLE_OK)
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goto fail;
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/* One last thing; always try to get the last modified time */
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cstat = CURLERR(curl_easy_setopt(curl, CURLOPT_FILETIME, (long)1));
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if (cstat != CURLE_OK)
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goto fail;
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fetchdata.stream = stream;
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fetchdata.size = 0;
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cstat = CURLERR(curl_easy_perform(curl));
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if (cstat != CURLE_OK)
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goto fail;
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if (stat == OC_NOERR) {
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/* return the file size*/
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#ifdef OCDEBUG
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oclog(OCLOGNOTE,"filesize: %lu bytes",fetchdata.size);
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#endif
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if (sizep != NULL)
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*sizep = fetchdata.size;
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/* Get the last modified time */
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if(filetime != NULL)
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cstat = curl_easy_getinfo(curl,CURLINFO_FILETIME,filetime);
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if(cstat != CURLE_OK) goto fail;
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}
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return OCTHROW(stat);
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fail:
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nclog(NCLOGERR, "curl error: %s", curl_easy_strerror(cstat));
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return OCTHROW(OC_ECURL);
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}
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OCerror
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ocfetchurl(CURL* curl, const char* url, NCbytes* buf, long* filetime)
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{
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OCerror stat = OC_NOERR;
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CURLcode cstat = CURLE_OK;
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size_t len;
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long httpcode = 0;
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/* Set the URL */
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cstat = CURLERR(CURLERR(curl_easy_setopt(curl, CURLOPT_URL, (void*)url)));
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if (cstat != CURLE_OK)
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goto fail;
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/* send all data to this function */
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cstat = CURLERR(curl_easy_setopt(curl, CURLOPT_WRITEFUNCTION, WriteMemoryCallback));
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if (cstat != CURLE_OK)
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goto fail;
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/* we pass our file to the callback function */
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cstat = CURLERR(curl_easy_setopt(curl, CURLOPT_WRITEDATA, (void*)buf));
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if (cstat != CURLE_OK)
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goto fail;
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/* One last thing; always try to get the last modified time */
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cstat = CURLERR(curl_easy_setopt(curl, CURLOPT_FILETIME, (long)1));
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cstat = CURLERR(curl_easy_perform(curl));
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if(cstat == CURLE_PARTIAL_FILE) {
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/* Log it but otherwise ignore */
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nclog(NCLOGWARN, "curl error: %s; ignored",
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curl_easy_strerror(cstat));
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cstat = CURLE_OK;
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}
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httpcode = ocfetchhttpcode(curl);
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if(cstat != CURLE_OK) goto fail;
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/* Get the last modified time */
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if(filetime != NULL)
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cstat = CURLERR(curl_easy_getinfo(curl,CURLINFO_FILETIME,filetime));
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if(cstat != CURLE_OK) goto fail;
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/* Null terminate the buffer*/
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len = ncbyteslength(buf);
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ncbytesappend(buf, '\0');
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ncbytessetlength(buf, len); /* don't count null in buffer size*/
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#ifdef OCDEBUG
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nclog(NCLOGNOTE,"buffersize: %lu bytes",(off_t)ncbyteslength(buf));
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#endif
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return OCTHROW(stat);
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fail:
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nclog(NCLOGERR, "curl error: %s", curl_easy_strerror(cstat));
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switch (httpcode) {
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case 401: stat = OC_EAUTH; break;
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case 404: stat = OC_ENOFILE; break;
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case 500: stat = OC_EDAPSVC; break;
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case 200: break;
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default: stat = OC_ECURL; break;
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}
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return OCTHROW(stat);
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}
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static size_t
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WriteFileCallback(void* ptr, size_t size, size_t nmemb, void* data)
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{
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size_t realsize = size * nmemb;
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size_t count;
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struct Fetchdata* fetchdata;
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fetchdata = (struct Fetchdata*) data;
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if(realsize == 0)
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nclog(NCLOGWARN,"WriteFileCallback: zero sized chunk");
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count = fwrite(ptr, size, nmemb, fetchdata->stream);
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if (count > 0) {
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fetchdata->size += (count * size);
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} else {
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nclog(NCLOGWARN,"WriteFileCallback: zero sized write");
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}
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#ifdef OCPROGRESS
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nclog(NCLOGNOTE,"callback: %lu bytes",(off_t)realsize);
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#endif
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return count;
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}
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static size_t
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WriteMemoryCallback(void *ptr, size_t size, size_t nmemb, void *data)
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{
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size_t realsize = size * nmemb;
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NCbytes* buf = (NCbytes*) data;
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if(realsize == 0)
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nclog(NCLOGWARN,"WriteMemoryCallback: zero sized chunk");
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/* Optimize for reading potentially large dods datasets */
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if(!ncbytesavail(buf,realsize)) {
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/* double the size of the packet */
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ncbytessetalloc(buf,2*ncbytesalloc(buf));
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}
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ncbytesappendn(buf, ptr, realsize);
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#ifdef OCPROGRESS
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nclog(NCLOGNOTE,"callback: %lu bytes",(off_t)realsize);
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#endif
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return realsize;
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}
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#if 0
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static void
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assembleurl(DAPURL* durl, NCbytes* buf, int what)
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{
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encodeurltext(durl->url,buf);
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if(what & WITHPROJ) {
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ncbytescat(buf,"?");
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encodeurltext(durl->projection,buf);
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}
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if(what & WITHSEL) encodeurltext(durl->selection,buf);
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}
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static char mustencode="";
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static char hexchars[16] = {
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'0', '1', '2', '3',
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'4', '5', '6', '7',
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'8', '9', 'a', 'b',
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'c', 'd', 'e', 'f',
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};
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static void
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encodeurltext(char* text, NCbytes* buf)
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{
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/* Encode the URL to handle illegal characters */
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len = strlen(url);
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encoded = ocmalloc(len*4+1); /* should never be larger than this*/
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if(encoded==NULL) return;
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p = url; q = encoded;
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while((c=*p++)) {
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if(strchr(mustencode,c) != NULL) {
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char tmp[8];
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int hex1, hex2;
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hex1 = (c & 0x0F);
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hex2 = (c & 0xF0) >> 4;
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tmp[0] = '0'; tmp[1] = 'x';
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tmp[2] = hexchars[hex2]; tmp[3] = hexchars[hex1];
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tmp[4] = '\0';
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ncbytescat(buf,tmp);
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} else *q++ = (char)c;
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}
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}
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#endif
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OCerror
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occurlopen(CURL** curlp)
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{
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int stat = OC_NOERR;
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CURLcode cstat = CURLE_OK;
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CURL* curl;
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/* initialize curl*/
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curl = curl_easy_init();
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if (curl == NULL)
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stat = OC_ECURL;
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else {
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cstat = CURLERR(curl_easy_setopt(curl, CURLOPT_NOPROGRESS, 1));
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if (cstat != CURLE_OK)
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stat = OC_ECURL;
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}
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if (curlp)
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*curlp = curl;
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return OCTHROW(stat);
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}
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void
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occurlclose(CURL* curl)
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{
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if (curl != NULL)
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curl_easy_cleanup(curl);
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}
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OCerror
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ocfetchlastmodified(CURL* curl, char* url, long* filetime)
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{
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int stat = OC_NOERR;
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CURLcode cstat = CURLE_OK;
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/* Set the URL */
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cstat = CURLERR(curl_easy_setopt(curl, CURLOPT_URL, (void*)url));
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if (cstat != CURLE_OK)
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goto fail;
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/* Ask for head */
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cstat = CURLERR(curl_easy_setopt(curl, CURLOPT_TIMEOUT, 30)); /* 30sec timeout*/
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cstat = CURLERR(curl_easy_setopt(curl, CURLOPT_CONNECTTIMEOUT, 2));
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cstat = CURLERR(curl_easy_setopt(curl, CURLOPT_HEADER, 1));
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cstat = CURLERR(curl_easy_setopt(curl, CURLOPT_NOBODY, 1));
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cstat = CURLERR(curl_easy_setopt(curl, CURLOPT_NOPROGRESS, 1));
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cstat = CURLERR(curl_easy_setopt(curl, CURLOPT_FILETIME, (long)1));
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cstat = CURLERR(curl_easy_perform(curl));
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if(cstat != CURLE_OK) goto fail;
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if(filetime != NULL)
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cstat = CURLERR(curl_easy_getinfo(curl,CURLINFO_FILETIME,filetime));
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if(cstat != CURLE_OK) goto fail;
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return OCTHROW(stat);
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fail:
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nclog(NCLOGERR, "curl error: %s", curl_easy_strerror(cstat));
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return OCTHROW(OC_ECURL);
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}
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OCerror
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ocping(const char* url)
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{
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int stat = OC_NOERR;
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CURLcode cstat = CURLE_OK;
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CURL* curl = NULL;
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NCbytes* buf = NULL;
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/* Create a CURL instance */
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stat = occurlopen(&curl);
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if(stat != OC_NOERR) return stat;
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/* Use redirects */
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cstat = CURLERR(curl_easy_setopt(curl, CURLOPT_MAXREDIRS, 10L));
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if (cstat != CURLE_OK)
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goto done;
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cstat = CURLERR(curl_easy_setopt(curl, CURLOPT_FOLLOWLOCATION, 1L));
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if (cstat != CURLE_OK)
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goto done;
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/* use a very short timeout: 10 seconds */
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cstat = CURLERR(curl_easy_setopt(curl, CURLOPT_TIMEOUT, (long)5));
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if (cstat != CURLE_OK)
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goto done;
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/* fail on HTTP 400 code errors */
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cstat = CURLERR(curl_easy_setopt(curl, CURLOPT_FAILONERROR, (long)1));
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if (cstat != CURLE_OK)
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goto done;
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/* Try to get the file */
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buf = ncbytesnew();
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stat = ocfetchurl(curl,url,buf,NULL);
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if(stat == OC_NOERR) {
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/* Don't trust curl to return an error when request gets 404 */
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long http_code = 0;
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cstat = CURLERR(curl_easy_getinfo(curl,CURLINFO_RESPONSE_CODE, &http_code));
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if (cstat != CURLE_OK)
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goto done;
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if(http_code >= 400) {
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cstat = CURLE_HTTP_RETURNED_ERROR;
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goto done;
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}
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} else
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goto done;
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done:
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ncbytesfree(buf);
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occurlclose(curl);
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if(cstat != CURLE_OK) {
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nclog(NCLOGERR, "curl error: %s", curl_easy_strerror(cstat));
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stat = OC_EDAPSVC;
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}
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return OCTHROW(stat);
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}
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