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netcdf-c/oc2/ocinternal.c

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/* Copyright 2009, UCAR/Unidata and OPeNDAP, Inc.
See the COPYRIGHT file for more information. */
#include "config.h"
#include <stdio.h>
#include <fcntl.h>
#include <errno.h>
#ifdef HAVE_UNISTD_H
#include <unistd.h>
#endif
#include "ocinternal.h"
#include "ocdebug.h"
#include "occlientparams.h"
#include "ocrc.h"
#include "occurlfunctions.h"
#include "ochttp.h"
#include "ocread.h"
#include "dapparselex.h"
/* Note: TMPPATH must end in '/' */
#ifdef __CYGWIN__
#define TMPPATH1 "/cygdrive/c/temp/"
#define TMPPATH2 "./"
#elif _WIN32
#define TMPPATH1 "c:\\temp\\"
#define TMPPATH2 ".\\"
#else
#define TMPPATH1 "/tmp/"
#define TMPPATH2 "./"
#endif
#define CLBRACE '{'
#define CRBRACE '}'
/* Define default rc files and aliases*/
static char* rcfilenames[4] = {".daprc",".dodsrc",".ocrc",NULL};
static int ocextractddsinmemory(OCstate*,OCtree*,int);
static int ocextractddsinfile(OCstate*,OCtree*,int);
static char* constraintescape(const char* url);
static OCerror createtempfile(OCstate*,OCtree*);
static int createtempfile1(char*,char**);
static int dataError(XXDR* xdrs, OCstate*);
static void ocsetcurlproperties(OCstate*);
extern OCnode* makeunlimiteddimension(void);
#ifdef _WIN32
#ifdef HAVE_FCNTL_H
#include <fcntl.h>
#endif
#define _S_IREAD 256
#define _S_IWRITE 128
#else
#ifdef HAVE_SYS_STAT_H
#include <sys/stat.h>
#endif
#endif
/* Collect global state info in one place */
struct OCGLOBALSTATE ocglobalstate;
int
ocinternalinitialize(void)
{
int stat = OC_NOERR;
if(!ocglobalstate.initialized) {
memset((void*)&ocglobalstate,0,sizeof(ocglobalstate));
ocglobalstate.initialized = 1;
}
/* Compute some xdr related flags */
xxdr_init();
ocloginit();
oc_curl_protocols(&ocglobalstate); /* see what protocols are supported */
/* compile the .dodsrc, if any */
{
char* path = NULL;
char* homepath = NULL;
char** alias;
FILE* f = NULL;
/* locate the configuration files: . first in '.', then $HOME */
for(alias=rcfilenames;*alias;alias++) {
size_t pathlen = strlen("./")+strlen(*alias)+1;
path = (char*)malloc(pathlen);
if(path == NULL) return OC_ENOMEM;
if(!occopycat(path,pathlen,2,"./",*alias))
return OC_EOVERRUN;
/* see if file is readable */
f = fopen(path,"r");
if(f != NULL) break;
if(path != NULL) {free(path); path = NULL;} /* cleanup */
}
if(f == NULL) { /* try $HOME */
OCASSERT(path == NULL);
homepath = getenv("HOME");
if (homepath!= NULL) {
for(alias=rcfilenames;*alias;alias++) {
size_t pathlen = strlen(homepath)+1+strlen(*alias)+1;
path = (char*)malloc(pathlen);
if(path == NULL) return OC_ENOMEM;
if(!occopycat(path,pathlen,3,homepath,"/",*alias))
return OC_EOVERRUN;
f = fopen(path,"r");
if(f != NULL) break;
if(path != NULL) {free(path); path=NULL;}
}
}
}
if(f == NULL) {
oclog(OCLOGDBG,"Cannot find runtime configuration file");
} else {
OCASSERT(path != NULL);
fclose(f);
if(ocdebug > 1)
fprintf(stderr, "DODS RC file: %s\n", path);
if(ocdodsrc_read(*alias,path) == 0)
oclog(OCLOGERR, "Error parsing %s\n",path);
}
if(path != NULL) free(path);
}
return OCTHROW(stat);
}
/**************************************************/
OCerror
ocopen(OCstate** statep, const char* url)
{
int stat = OC_NOERR;
OCstate * state = NULL;
OCURI* tmpurl = NULL;
CURL* curl = NULL; /* curl handle*/
if(!ocuriparse(url,&tmpurl)) {OCTHROWCHK(stat=OC_EBADURL); goto fail;}
stat = occurlopen(&curl);
if(stat != OC_NOERR) {OCTHROWCHK(stat); goto fail;}
state = (OCstate*)ocmalloc(sizeof(OCstate)); /* ocmalloc zeros memory*/
if(state == NULL) {OCTHROWCHK(stat=OC_ENOMEM); goto fail;}
/* Setup DAP state*/
state->header.magic = OCMAGIC;
state->header.occlass = OC_State;
state->curl = curl;
state->trees = oclistnew();
state->uri = tmpurl;
if(!ocuridecodeparams(state->uri)) {
oclog(OCLOGWARN,"Could not parse client parameters");
}
state->packet = ocbytesnew();
ocbytessetalloc(state->packet,DFALTPACKETSIZE); /*initial reasonable size*/
/* set curl properties for this link */
ocsetcurlproperties(state);
if(statep) *statep = state;
return OCTHROW(stat);
fail:
ocurifree(tmpurl);
if(state != NULL) ocfree(state);
if(curl != NULL) occurlclose(curl);
return OCTHROW(stat);
}
OCerror
ocfetch(OCstate* state, const char* constraint, OCdxd kind, OCflags flags,
OCnode** rootp)
{
OCtree* tree = NULL;
OCnode* root = NULL;
OCerror stat = OC_NOERR;
tree = (OCtree*)ocmalloc(sizeof(OCtree));
MEMCHECK(tree,OC_ENOMEM);
memset((void*)tree,0,sizeof(OCtree));
tree->dxdclass = kind;
tree->state = state;
tree->constraint = constraintescape(constraint);
if(tree->constraint == NULL)
tree->constraint = nulldup(constraint);
/* Set curl properties: pwd, flags, proxies, ssl */
if((stat=ocset_user_password(state))!= OC_NOERR) goto fail;
if((stat=ocset_curl_flags(state)) != OC_NOERR) goto fail;
if((stat=ocset_proxy(state)) != OC_NOERR) goto fail;
if((stat=ocset_ssl(state)) != OC_NOERR) goto fail;
ocbytesclear(state->packet);
switch (kind) {
case OCDAS:
stat = readDAS(state,tree);
if(stat == OC_NOERR) {
tree->text = ocbytesdup(state->packet);
if(tree->text == NULL) stat = OC_EDAS;
}
break;
case OCDDS:
stat = readDDS(state,tree);
if(stat == OC_NOERR) {
tree->text = ocbytesdup(state->packet);
if(tree->text == NULL) stat = OC_EDDS;
}
break;
case OCDATADDS:
if((flags & OCONDISK) != 0) {/* store in file */
/* Create the datadds file immediately
so that DRNO can reference it*/
/* Make the tmp file*/
stat = createtempfile(state,tree);
if(stat) {OCTHROWCHK(stat); goto fail;}
stat = readDATADDS(state,tree,flags);
if(stat == OC_NOERR) {
/* Separate the DDS from data and return the dds;
will modify packet */
stat = ocextractddsinfile(state,tree,flags);
}
} else { /*inmemory*/
stat = readDATADDS(state,tree,flags);
if(stat == OC_NOERR) {
/* Separate the DDS from data and return the dds;
will modify packet */
stat = ocextractddsinmemory(state,tree,flags);
}
}
break;
default:
break;
}/*switch*/
if(stat != OC_NOERR) {
/* Obtain any http code */
state->error.httpcode = ocfetchhttpcode(state->curl);
if(state->error.httpcode >= 400) {
oclog(OCLOGWARN,"oc_open: Could not read url; http error = %l",state->error.httpcode);
} else {
oclog(OCLOGWARN,"oc_open: Could not read url");
}
goto fail;
}
tree->nodes = NULL;
stat = DAPparse(state,tree,tree->text);
/* Check and report on an error return from the server */
if(stat == OC_EDAPSVC && state->error.code != NULL) {
oclog(OCLOGERR,"oc_open: server error retrieving url: code=%s message=\"%s\"",
state->error.code,
(state->error.message?state->error.message:""));
}
if(stat) {OCTHROWCHK(stat); goto fail;}
root = tree->root;
/* make sure */
tree->root = root;
root->tree = tree;
/* Verify the parse */
switch (kind) {
case OCDAS:
if(root->octype != OC_Attributeset)
{OCTHROWCHK(stat=OC_EDAS); goto fail;}
break;
case OCDDS:
if(root->octype != OC_Dataset)
{OCTHROWCHK(stat=OC_EDDS); goto fail;}
break;
case OCDATADDS:
if(root->octype != OC_Dataset)
{OCTHROWCHK(stat=OC_EDATADDS); goto fail;}
/* Modify the tree kind */
tree->dxdclass = OCDATADDS;
break;
default: return OC_EINVAL;
}
if(kind != OCDAS) {
/* Process ocnodes to mark those that are cacheable */
ocmarkcacheable(state,root);
/* Process ocnodes to handle various semantic issues*/
occomputesemantics(tree->nodes);
}
/* Process ocnodes to compute name info*/
occomputefullnames(tree->root);
if(kind == OCDATADDS) {
if((flags & OCONDISK) != 0) {
tree->data.xdrs = xxdr_filecreate(tree->data.file,tree->data.bod);
} else {
#ifdef OCDEBUG
fprintf(stderr,"ocfetch.datadds.memory: datasize=%lu bod=%lu\n",
(unsigned long)tree->data.datasize,(unsigned long)tree->data.bod);
#endif
/* Switch to zero based memory */
tree->data.xdrs
= xxdr_memcreate(tree->data.memory,tree->data.datasize,tree->data.bod);
}
MEMCHECK(tree->data.xdrs,OC_ENOMEM);
/* Do a quick check to see if server returned an ERROR {}
at the beginning of the data
*/
if(dataError(tree->data.xdrs,state)) {
stat = OC_EDATADDS;
oclog(OCLOGERR,"oc_open: server error retrieving url: code=%s message=\"%s\"",
state->error.code,
(state->error.message?state->error.message:""));
goto fail;
}
/* Compile the data into a more accessible format */
stat = occompile(state,tree->root);
if(stat != OC_NOERR)
goto fail;
}
/* Put root into the state->trees list */
oclistpush(state->trees,(void*)root);
if(rootp) *rootp = root;
return stat;
fail:
if(root != NULL)
ocroot_free(root);
else if(tree != NULL)
octree_free(tree);
return OCTHROW(stat);
}
static OCerror
createtempfile(OCstate* state, OCtree* tree)
{
int fd = 0;
char* name = NULL;
fd = createtempfile1(TMPPATH1,&name);
if(fd < 0)
fd = createtempfile1(TMPPATH2,&name);
if(fd < 0) {
oclog(OCLOGERR,"oc_open: attempt to open tmp file failed: %s",name);
if(name) free(name);
return errno;
}
#ifdef OCDEBUG
oclog(OCLOGNOTE,"oc_open: using tmp file: %s",name);
#endif
tree->data.filename = name; /* remember our tmp file name */
tree->data.file = fdopen(fd,"w+");
if(tree->data.file == NULL) return OC_EOPEN;
/* unlink the temp file so it will automatically be reclaimed */
if(ocdebug == 0) unlink(tree->data.filename);
return OC_NOERR;
}
int
createtempfile1(char* tmppath, char** tmpnamep)
{
int fd = 0;
char* tmpname = NULL;
size_t tmpsize = strlen(tmppath)+strlen("dataddsXXXXXX") + 1;
tmpname = (char*)malloc(tmpsize);
if(tmpname == NULL) return -1;
if(!occopycat(tmpname,tmpsize,1,tmppath))
return OC_EOVERRUN;
#ifdef HAVE_MKSTEMP
if(!occoncat(tmpname,tmpsize,1,"dataddsXXXXXX"))
return OC_EOVERRUN;
/* Note Potential problem: old versions of this function
leave the file in mode 0666 instead of 0600 */
fd = mkstemp(tmpname);
#else /* !HAVE_MKSTEMP */
/* Need to simulate by using some kind of pseudo-random number */
if(!occoncat(tmpname,tmpsize,1,"datadds"))
return OC_EOVERRUN;
{
int rno = rand();
char spid[7];
if(rno < 0) rno = -rno;
snprintf(spid,sizeof(spid),"%06d",rno);
if(!occoncat(tmpname,tmpsize,1,spid))
return OC_EOVERRUN;
# ifdef _WIN32
fd=open(tmpname,O_RDWR|O_BINARY|O_CREAT|O_EXCL|FILE_ATTRIBUTE_TEMPORARY, _S_IREAD|_S_IWRITE);
# else
fd=open(tmpname,O_RDWR|O_CREAT|O_EXCL, S_IRWXU);
# endif
}
#endif /* !HAVE_MKSTEMP */
if(tmpname == NULL) return -1;
if(tmpnamep) *tmpnamep = tmpname;
else
free(tmpname);
return fd;
}
void
occlose(OCstate* state)
{
unsigned int i;
if(state == NULL) return;
/* Warning: ocfreeroot will attempt to remove the root from state->trees */
/* Ok in this case because we are popping the root out of state->trees */
for(i=0;i<oclistlength(state->trees);i++) {
OCnode* root = (OCnode*)oclistpop(state->trees);
ocroot_free(root);
}
oclistfree(state->trees);
ocurifree(state->uri);
ocbytesfree(state->packet);
ocfree(state->error.code);
ocfree(state->error.message);
ocfree(state->curlflags.useragent);
ocfree(state->curlflags.cookiejar);
ocfree(state->curlflags.cookiefile);
ocfree(state->ssl.certificate);
ocfree(state->ssl.key);
ocfree(state->ssl.keypasswd);
ocfree(state->ssl.cainfo);
ocfree(state->ssl.capath);
ocfree(state->proxy.host);
ocfree(state->creds.username);
ocfree(state->creds.password);
if(state->curl != NULL) occurlclose(state->curl);
ocfree(state);
}
static OCerror
ocextractddsinmemory(OCstate* state, OCtree* tree, OCflags flags)
{
OCerror stat = OC_NOERR;
size_t ddslen, bod, bodfound;
/* Read until we find the separator (or EOF)*/
bodfound = ocfindbod(state->packet,&bod,&ddslen);
if(!bodfound) {/* No BOD; pretend */
bod = tree->data.bod;
ddslen = tree->data.datasize;
}
tree->data.bod = bod;
tree->data.ddslen = ddslen;
/* copy out the dds */
if(ddslen > 0) {
tree->text = (char*)ocmalloc(ddslen+1);
memcpy((void*)tree->text,(void*)ocbytescontents(state->packet),ddslen);
tree->text[ddslen] = '\0';
} else
tree->text = NULL;
/* Extract the inmemory contents */
tree->data.memory = ocbytesextract(state->packet);
#ifdef OCIGNORE
/* guarantee the data part is on an 8 byte boundary */
if(tree->data.bod % 8 != 0) {
unsigned long count = tree->data.datasize - tree->data.bod;
memcpy(tree->xdrmemory,tree->xdrmemory+tree->data.bod,count);
tree->data.datasize = count;
tree->data.bod = 0;
tree->data.ddslen = 0;
}
#endif
if(tree->text == NULL) stat = OC_EDATADDS;
return OCTHROW(stat);
}
static OCerror
ocextractddsinfile(OCstate* state, OCtree* tree, OCflags flags)
{
OCerror stat = OC_NOERR;
size_t ddslen, bod, bodfound;
/* Read until we find the separator (or EOF)*/
ocbytesclear(state->packet);
rewind(tree->data.file);
bodfound = 0;
do {
char chunk[1024];
size_t count;
/* read chunks of the file until we find the separator*/
count = fread(chunk,1,sizeof(chunk),tree->data.file);
if(count <= 0) break; /* EOF;*/
ocbytesappendn(state->packet,chunk,count);
bodfound = ocfindbod(state->packet,&bod,&ddslen);
} while(!bodfound);
if(!bodfound) {/* No BOD; pretend */
bod = tree->data.bod;
ddslen = tree->data.datasize;
#ifdef OCDEBUG
fprintf(stderr,"missing bod: ddslen=%lu bod=%lu\n",
(unsigned long)ddslen,(unsigned long)bod);
#endif
}
tree->data.bod = bod;
tree->data.ddslen = ddslen;
/* copy out the dds */
if(ddslen > 0) {
tree->text = (char*)ocmalloc(ddslen+1);
memcpy((void*)tree->text,(void*)ocbytescontents(state->packet),ddslen);
tree->text[ddslen] = '\0';
} else
tree->text = NULL;
/* reset the position of the tmp file*/
fseek(tree->data.file,tree->data.bod,SEEK_SET);
if(tree->text == NULL) stat = OC_EDATADDS;
return OCTHROW(stat);
}
/* Allow these (non-alpha-numerics) to pass thru */
static char okchars[] = "&/:;,.=?@'\"<>{}!|\\^[]`~";
static char hexdigits[] = "0123456789abcdef";
/* Modify constraint to use %XX escapes */
static char*
constraintescape(const char* url)
{
size_t len;
char* p;
int c;
char* eurl;
if(url == NULL) return NULL;
len = strlen(url);
eurl = ocmalloc(1+3*len); /* worst case: c -> %xx */
MEMCHECK(eurl,NULL);
p = eurl;
*p = '\0';
while((c=*url++)) {
if(c >= '0' && c <= '9') {*p++ = c;}
else if(c >= 'a' && c <= 'z') {*p++ = c;}
else if(c >= 'A' && c <= 'Z') {*p++ = c;}
else if(strchr(okchars,c) != NULL) {*p++ = c;}
else {
*p++ = '%';
*p++ = hexdigits[(c & 0xf0)>>4];
*p++ = hexdigits[(c & 0xf)];
}
}
*p = '\0';
return eurl;
}
OCerror
ocupdatelastmodifieddata(OCstate* state)
{
OCerror status = OC_NOERR;
long lastmodified;
char* base = NULL;
base = ocuribuild(state->uri,NULL,NULL,OCURIENCODE);
status = ocfetchlastmodified(state->curl, base, &lastmodified);
free(base);
if(status == OC_NOERR) {
state->datalastmodified = lastmodified;
}
return status;
}
/*
Set curl properties for link based on rc files
*/
static void
ocsetcurlproperties(OCstate* state)
{
CURLcode cstat = CURLE_OK;
/* process the triple store wrt to this state */
if(ocdodsrc_process(state) != OC_NOERR) {
oclog(OCLOGERR,"Malformed .opendaprc configuration file");
goto fail;
}
if(state->creds.username == NULL && state->creds.password == NULL) {
if(state->uri->user != NULL && state->uri->password != NULL) {
/* this overrides .dodsrc */
if(state->creds.password) free(state->creds.password);
state->creds.password = nulldup(state->uri->password);
if(state->creds.username) free(state->creds.username);
state->creds.username = nulldup(state->uri->user);
}
}
if(state->curlflags.useragent == NULL) {
size_t len = strlen(DFALTUSERAGENT) + strlen(VERSION) + 1;
char* agent = (char*)malloc(len+1);
if(occopycat(agent,len,2,DFALTUSERAGENT,VERSION))
state->curlflags.useragent = agent;
}
return;
fail:
if(cstat != CURLE_OK)
oclog(OCLOGERR, "curl error: %s", curl_easy_strerror(cstat));
return;
}
OCerror
ocsetuseragent(OCstate* state, const char* agent)
{
if(state->curlflags.useragent != NULL)
free(state->curlflags.useragent);
state->curlflags.useragent = strdup(agent);
if(state->curlflags.useragent == NULL)
return OC_ENOMEM;
return OC_NOERR;
}
static char* ERROR_TAG = "Error ";
static int
dataError(XXDR* xdrs, OCstate* state)
{
int depth=0;
int errfound = 0;
off_t ckp=0,avail=0,i=0;
char* errmsg = NULL;
char errortext[16]; /* bigger thant |ERROR_TAG|*/
avail = xxdr_getavail(xdrs);
if(avail < strlen(ERROR_TAG))
goto done; /* assume it is ok */
ckp = xxdr_getpos(xdrs);
/* Read enough characters to test for 'ERROR ' */
errortext[0] = '\0';
xxdr_getbytes(xdrs,errortext,(off_t)strlen(ERROR_TAG));
if(ocstrncmp(errortext,ERROR_TAG,strlen(ERROR_TAG)) != 0)
goto done; /* not an immediate error */
/* Try to locate the whole error body */
xxdr_setpos(xdrs,ckp);
for(depth=0,i=0;i<avail;i++) {
xxdr_getbytes(xdrs,errortext,1);
if(errortext[0] == CLBRACE) depth++;
else if(errortext[0] == CRBRACE) {
depth--;
if(depth == 0) {i++; break;}
}
}
errmsg = (char*)malloc(i+1);
if(errmsg == NULL) {errfound = 1; goto done;}
xxdr_setpos(xdrs,ckp);
xxdr_getbytes(xdrs,errmsg,i);
errmsg[i] = '\0';
state->error.message = errmsg;
state->error.code = strdup("?");
state->error.httpcode = 404;
xxdr_setpos(xdrs,ckp);
errfound = 1;
done:
xxdr_setpos(xdrs,ckp);
return errfound;
}
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