/
crestfs.c
executable file
·1119 lines (979 loc) · 31.5 KB
/
crestfs.c
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/* For more information, see http://www.macdevcenter.com/pub/a/mac/2007/03/06/macfuse-new-frontiers-in-file-systems.html. */
#define _GNU_SOURCE
#include <errno.h>
#include <fcntl.h>
#include <string.h>
#include <stdio.h>
#include <stdlib.h>
#include <unistd.h>
#include <errno.h>
#include <string.h>
#include <sys/types.h>
#include <netinet/in.h>
#include <dirent.h>
#define FUSE_USE_VERSION 26
#include <fuse.h>
#include <sys/time.h>
//#include <xlocale.h>
#include <strings.h>
#include "resource.h"
#include "common.h"
#include "http.h"
#include <pthread.h>
//global variables (another one is down there but it's use is jsut there.
char rootdir[1024]="";
char cachedirname[1024]="";
int maxcacheage=-1;
//we may want this to be configurable in future - a command line option perhaps
/*************************/
//retrieve the value of an HTTP header
//be warned the headers may not be a nul-terminated string
//so don't do stupid stuff like strlen(headers) because it
//may not work
/******************* END UTILITY FUNCTIONS< BEGIN ACTUALLY DOING OF STUFF!!!!! *********************/
#define METALEN 1024
#define HEADERLEN 65535
static int
crest_getattr(const char *path, struct stat *stbuf)
{
char header[HEADERLEN]="";
memset(stbuf,0,sizeof(struct stat)); //just to be on the safe side?
if (strcmp(path, "/") == 0) { /* The root directory of our file system. */
stbuf->st_mode = S_IFDIR | 0755;
stbuf->st_nlink = 1; //set this to '1' to force find(1) to be able to iterate
} else {
char hostname[80];
char pathpart[1024];
pathparse(path,hostname,pathpart,80,1024);
brintf("getattr: path parses to hsotname: %s and path: '%s'\n",hostname,pathpart);
if(strcmp(pathpart,"/")==0 || strcmp(path,"/")==0) {
brintf("ROOT OF A HOST - *MUST* be a directory!\n");
//root of a host, MUST be a directory no matter what.
stbuf->st_mode = S_IFDIR | 0755; //I am a a directory!
stbuf->st_nlink = 1; //use '1' to allow find(1) to decend within...
} else {
FILE *cachefile=0;
int isdirectory=-1;
/**** ALL WORK IS DONE WITH get_resource! ****/
cachefile=get_resource(path,header,HEADERLEN,&isdirectory,"HEAD","getattr","r");
/*** THAT DID A LOT! ****/
if(isdirectory) {
brintf("Getattr for directory mode detected.\n");
stbuf->st_mode = S_IFDIR | 0755;
stbuf->st_nlink = 1;
} else {
int httpstatus=fetchstatus(header);
char date[80]="";
char length[80]="";
brintf("Status: %d on path %s, Header: %s\n",httpstatus,path,header);
switch(httpstatus) {
case 304:
brintf("ERROR - we should never be 'exposed' to a 304 header\n");
exit(33); //fundamental structure of space and time has been distorted. I don't want to live in this world.
break;
case 200:
case 201:
case 204:
//brintf("It is a file\n");
stbuf->st_mode = S_IFREG | 0700;
//brintf("Pre-mangulation headers: %s\n",header);
fetchheader(header,"last-modified",date,80);
fetchheader(header,"content-length",length,80);
if(strlen(length)>0) {
//use content-length in case this file was only HEAD'ed, otherwise seek to its end
stbuf->st_size=atoi(length);
} else {
if(!cachefile) {
brintf("WEIRD! No cachefile given on a %d, and couldn't find content-length!!! Let's see if there's anything interesting in errno: %s\n",httpstatus,strerror(errno));
stbuf->st_size=0;
} else {
int seeker=fseek(cachefile,0,SEEK_END);
if(seeker) {
brintf("Can't seek to end of file! WTF!\n");
exit(88); //Errr....yeah, all bets are off if taht happens
}
brintf("getattr:seeked to: %ld\n",ftell(cachefile));
stbuf->st_size= ftell(cachefile);
}
}
//brintf("Post-mangulation headers is: %s\n",header+1);
//brintf("Post-mangulation headers is: %s\n",header);
//brintf("BTW, date I'm trying to format: %s\n",date);
//brintf("WEIRD...date: %s, length: %d\n",date,(int)stbuf->st_size);
stbuf->st_mtime = parsedate(date);
brintf("parsedate: Uh, Date %s parsed to: %d\n",date,(int)stbuf->st_mtime);
break;
case 301:
case 302:
case 303:
case 307:
//http redirect, means either DIRECTORY or SYMLINK
//start out by keeping it simple - if it ends in a
//ZERO caching attempts, to start with...
stbuf->st_mode = S_IFLNK;
stbuf->st_nlink = 1;
break;
case 404:
if(cachefile) {
brintf("Why did I get a valid cachefile on a 404?!");
fclose(cachefile);
}
return -ENOENT;
break;
case 401:
if(cachefile) {
fclose(cachefile);
}
return -EACCES;
break;
default:
brintf("Weird http status, don't know what to do with it!!! It is: %d\n",httpstatus);
}
}
if(cachefile)
fclose(cachefile);
else
brintf("TRY TO CLOSE NO CACHEFILE!\n");
}
}
return 0;
}
#include <libgen.h> //needed for dirname and friends, used to calculate symlink targets
static int
crest_readlink(const char *path, char * buf, size_t bufsize)
{
//we'll start with the assumption this actuallly IS a symlink.
char location[4096]="";
char header[HEADERLEN]="";
FILE *cachefile;
int is_directory=-1;
cachefile=get_resource(path,header,HEADERLEN,&is_directory,"HEAD","readlink","r");
if(is_directory) {
if(cachefile) {
fclose(cachefile);
}
return -EINVAL;
}
fetchheader(header,"Location",location,4096);
//from an http://www.domainname.com/path/stuff/whatever
//we must get to a local path.
if(strncmp(location,"http://",7)!=0) {
//relative symlink. Either relative to _SERVER_ root, or relative to dirname...
if(location[0]=='/') {
brintf("No absolute directory-relative symlinks yet, sorry\n");
return -EIO;
strlcpy(buf,rootdir,bufsize); //fs cache 'root'
} else if(strlen(location)>0) {
strlcpy(buf,rootdir,bufsize); //fs cache 'root'
char dn[1024];
strlcpy(dn,path,1024);
strlcat(buf,dirname(dn),bufsize); //may modify argument, hence the copy
strlcat(buf,"/",bufsize);
strlcat(buf,location,bufsize);
} else {
strlcpy(buf,rootdir,bufsize); //fs cache 'root'
brintf("Unsupported protocol, or missing 'location' header: %s\n",location);
return -ENOENT;
}
} else {
strlcpy(buf,rootdir,bufsize); //fs cache 'root'
strlcat(buf,"/",bufsize);
strlcat(buf,location+7,bufsize);
}
if(cachefile) {
brintf("Freaky, got a valid cachefile for a symlink?!\n");
fclose(cachefile);
}
struct stat st;
int stres=lstat(path+1,&st);
if(stres==0 && S_ISLNK(st.st_mode)) {
char linkbuf[1024]="";
int linklen=readlink(path+1,linkbuf,1024);
if(linklen>1023) {
brintf("Too long of a link :(\n");
exit(54); //buffer overflow
}
linkbuf[linklen+1]='\0';
if(stres==0 && strncmp(linkbuf,buf,1024)==0) {
//brintf("Perfect match on symlink! Not doing anything\n");
return 0;
} else {
brintf("Nope, link is badly made, it is currently: %s\n",linkbuf);
}
}
brintf("I will unlink: %s, and point it to: %s\n",path+1,buf);
int unlinkstat=unlink(path+1); (void)unlinkstat;
int linkstat=symlink(buf,path+1); (void)linkstat;
brintf("Going to return link path as: %s (unlink status: %d, link status: %d)\n",buf,unlinkstat,linkstat);
return 0;
}
static int
crest_open(const char *path, struct fuse_file_info *fi)
{
FILE *rsrc=0;
char headers[4096];
int is_directory=-1;
int wantwrite=(fi->flags & O_ACCMODE) != O_RDONLY; //not read-only means write only or read-write.
if(!wants_auth(path)) {
//not under the root auth URL, so no writing allowed
if (wantwrite) { /* Only reading allowed. */
return -EACCES;
}
}
rsrc=get_resource(path,headers,4096,&is_directory,"GET","open",(wantwrite? "r+": "r"));
if(is_directory) {
if(rsrc) {
fclose(rsrc);
}
return -EISDIR;
}
if(fetchstatus(headers)==404) {
if(rsrc) {
brintf("Wow - weird, got a 404 but a valid resource? I guess\n");
fclose(rsrc);
}
return -ENOENT;
}
if(rsrc) {
brintf("Going to set filehandle to POINTER: %p\n",rsrc);
fi->fh=(long int)rsrc;
return 0;
} else {
brintf("Uh, no resource retrieved? Setting fh to zero?\n");
fi->fh=0;
return 0;
}
}
static int
crest_release(const char *path __attribute__ ((unused)), struct fuse_file_info *fi)
{
brintf("Closing filehandle %p: for file: %s\n",(FILE *)(unsigned int)fi->fh,path);
if(fi->fh) {
return fclose((FILE *)(unsigned int)fi->fh);
} else {
return 0;
}
}
static int
crest_readdir(const char *path, void *buf, fuse_fill_dir_t filler,
off_t offset, struct fuse_file_info *fi)
{
FILE *dirfile=0;
int is_directory=-1;
if(fi) {
//brintf("Well, dunno why this is, but we have file info: %p, filehandle: %d\n",fi,(int)fi->fh);
}
//should do a directory listing in the domains directory (the first one)
// but let's do that later.
if(strcmp(path,"/")==0) {
brintf("PATH IS /!!!!!\n");
DIR *mydir;
struct dirent *dp;
int id=1;
mydir=opendir(".");
while((dp=readdir(mydir))!=0) {
brintf("Potential dir is: %s, id: %d (vs offset: %d)\n",dp->d_name,id,(int)offset);
if(id>offset) {
if(filler(buf,dp->d_name,NULL,id)!=0) {
break;
}
}
id++;
}
brintf("Done with dir listing, returning...");
closedir(mydir);
return 0;
}
char headers[8192];
dirfile=get_resource(path,headers,8192,&is_directory,"GET","readdir","r");
brintf("Just fetched the resource for this directory you're reading, just FYI.");
if(!is_directory) {
if(dirfile) {
fclose(dirfile);
}
return -ENOTDIR;
}
if(dirfile==0) {
//got no directory listing file, this directory doesn't even exist.
return -ENOENT;
}
directory_iterator it;
char filename[1024];
init_directory_iterator(&it,headers,dirfile);
int failcounter=0;
if(offset<++failcounter) filler(buf, ".", NULL, failcounter); /* Current directory (.) */
if(offset<++failcounter) filler(buf, "..", NULL, failcounter); /* Parent directory (..) */
while(directory_iterate(&it,filename,1024,0,0)) {
failcounter++;
brintf("Returned filename IS: %s - ",filename);
if(offset<failcounter) {
if(filler(buf, filename, NULL, failcounter)!=0) {
brintf("Filler said not zero.\n");
break;
} else {
brintf("OK\n");
}
} else {
brintf("Less than offset %d, so ignoring\n",(int)offset);
}
}
free_directory_iterator(&it);
fclose(dirfile);
return 0;
}
#if 0
while(status==0 && failcounter < TOOMANYFILES) {
failcounter++;
char hrefname[255];
char linkname[255];
weboffset+=rm[0].rm_eo;
//brintf("Weboffset: %d\n",weboffset);
status=regexec(&re,dirbuffer+weboffset,3,rm,0); // ???
if(status==0) {
reanswer(dirbuffer+weboffset,&rm[1],hrefname,255);
reanswer(dirbuffer+weboffset,&rm[2],linkname,255);
//brintf("Href? %s\n",hrefname);
//brintf("Link %s\n",linkname);
//brintf("href: %s link: %s\n",hrefname,linkname);
if(strcmp(hrefname,linkname)==0) {
//brintf("ELEMENT: %s\n",hrefname);
if(offset<failcounter)
if(filler(buf, hrefname, NULL, failcounter)!=0) {
brintf("Filler said not zero.\n");
break;
}
}
}
//brintf("staus; %d, 0: %d, 1:%d, 2: %d, href=%s, link=%s\n",status,rm[0].rm_so,rm[1].rm_so,rm[2].rm_so,hrefname,linkname);
//filler?
//filler(buf,rm[])
}
//brintf("while loop - complete\n");
if(failcounter>=TOOMANYFILES) {
brintf("Fail due to toomany\n");
}
free(dirbuffer);
regfree(&re);
return 0; //success? or does that mean fail?
}
}
#endif
#define FILEMAX 64*1024*1024
static int
crest_read(const char *path __attribute__ ((unused)), char *buf, size_t size, off_t offset,
struct fuse_file_info *fi)
{
FILE *cachefile;
if(fi) {
//brintf("Good filehandle for path: %s, pointer:%p\n",path,(FILE *)(unsigned int)fi->fh);
} else {
brintf("BAD FILE*INFO* IS ZERO for path: %s\n",path);
brintf("File was not properly opened?\n");
return -EIO;
}
cachefile=(FILE *)(unsigned int)fi->fh;
if(cachefile) {
if(fseek(cachefile,offset,SEEK_SET)==0) {
return fread(buf,1,size,cachefile);
} else {
//fail to seek - what'ssat mean?
return 0;
}
} else {
return -EIO;
}
}
#include <sys/file.h>
static int
crest_write(const char *path, const char *buf, size_t size, off_t offset, struct fuse_file_info *fi)
{
brintf("I'm going tow rite noe\n");
if(!fi) {
brintf("File Info is ZERO for path: %s\n",path);
return -EIO;
}
FILE *cachefile=(FILE *)(unsigned int)fi->fh;
//need to prolly flock() the *metadata* file or something here?
char metafilename[1024];
strlcpy(metafilename,METAPREPEND,1024);
strlcat(metafilename,"/",1024);
strlcat(metafilename,path,1024);
FILE *metafile=fopenr(metafilename+1,"r"); //only used for flock() now
if(!metafile) {
brintf("Couldn't open metafile on behalf of data-write: %s\n",metafilename);
return -EIO;
}
brintf("Uhm, our metafile (for reading) is: %s\n",metafilename+1);
safe_flock(fileno(metafile),LOCK_EX,metafilename+1); // begin 'transactioney-thing'. EXCLUSIVE LOCK.
if(cachefile) {
if(fseek(cachefile,offset,SEEK_SET)==0) {
int results=fwrite(buf,1,size,cachefile);
markdirty(path);
//faux_freshen_metadata(path);
fclose(metafile); //end transactoiney thing
//brintf("Truncate: %d, write: %d\n",truncres,writeres);
return results;
} else {
brintf("Failed to seek in file %s\n",path);
fclose(metafile);
return -EIO;
}
} else {
brintf("No cachefile ready for this file: %s.\n",path);
fclose(metafile);
return -EIO;
}
}
int cachedir = 0;
pthread_t putter;
static void *
crest_init(struct fuse_conn_info *conn __attribute__((unused)) )
{
brintf("I'm not intending to do anything with this connection: %p\n",conn);
fchdir(cachedir);
close(cachedir);
//I dunno, flock or some shit here?! Beats me.
// I would love to catch if I have to crestfs's running
if(strcmp(authfile,"/dev/null")!=0) {
printf("Creating write thread...\n");
pthread_create(&putter, NULL, putting_routine,0);
printf("Write Thread Created\n");
} else {
printf("WRITE SUPPORT DISABLED VIA /dev/null AUTHFILE\n");
}
return 0;
}
static int
crest_chmod(const char *p __attribute__((unused)), mode_t mode __attribute__((unused)))
{
return 0;
}
static int
crest_chown(const char *p __attribute__((unused)), uid_t u __attribute__((unused)), gid_t g __attribute__((unused)))
{
return 0;
}
static int
crest_utime (const char *p __attribute__((unused)), struct utimbuf *ut __attribute__((unused)))
{
return 0;
}
static int
crest_trunc (const char *path, off_t length)
{
//I don't need to freshen the metadata...because the file is marked as dirty anyways.
//it won't get refreshed
int isdirectory=-1;
FILE *cachefile=get_resource(path,0,0,&isdirectory,"GET","trunc","r+");
if(isdirectory) {
return -EISDIR;
}
if(!cachefile) {
return -ENOENT;
}
markdirty(path);
int truncres=ftruncate(fileno(cachefile),length);
fclose(cachefile);
brintf("Truncate of path: %s (to %d bytes) resulted in: %d - reason: %s",path+1,(int)length,truncres,strerror(errno));
if(truncres==0) {
return 0;
} else {
return -EIO;
}
}
/* static int
crest_create(const char *path, mode_t m __attribute__((unused)), struct fuse_file_info *fi)
{
*//* if(!wants_auth(path)) {
return -EACCES;
} */ /*
//I think crest_open does all the possible access-checking we'd need, anyways, so just call it
return crest_open(path,fi); //I think
} */
static int
crest_mknod(const char*path,mode_t m, dev_t d __attribute__((unused)))
{
brintf("Beginning mknod for %s\n",path);
//and create a file
if(!S_ISREG(m)) {
brintf("File you're requesting to make isn't regular, failo\n");
return -EACCES;
}
brintf("mknod: it's a regular file...\n");
char metafilename[1024];
strncpy(metafilename,METAPREPEND,1024);
strncat(metafilename,path,1024);
FILE * meta=fopenr(metafilename+1,"w+"); //CREATE IF NO EXIST!
if(!meta) {
brintf("COULD NOT CREATE METAFILE! %s",metafilename+1);
return -EIO;
}
brintf("mknod: meta file created.\n");
safe_flock(fileno(meta),LOCK_EX,metafilename+1); //you're just 'touch()'ing a file, no need to go that nuts on it dude.
FILE * data=fopenr((char *)path+1,"w+"); //CREATE if no exist.
if(!data) {
brintf("COULD not CREATE REAL FILE! %s",path+1);
fclose(meta);
return -EIO;
}
brintf("OK, fine - files created *AND* truncated!\n");
//should we be setting a DATE on this file? This would make go away some of our 1/1/1970 problems.
//but it may bring us other problems...well, let's jsut try it, we've got the code hanging out.
markdirty(path); //path marked dirty so it will get 'put'
freshen_metadata(path,200,0); //shiny metadata taill the PUT rewrites it
append_parents(path); //make it look like I've been appended to my parents directory listings!
fclose(data);
fclose(meta); //causes unlock
return 0;
}
//there are all kinds of cross-polination of concerns leaking all over the place here.
//first, we're directly referencing FILE *'s
//next we're directly calling things with PENDINGDIR
static int
crest_unlink(const char *path)
{
//unlink path+1
char metapath[1024];
strlcpy(metapath,METAPREPEND,1024);
strlcat(metapath,path,1024);
FILE *metafile=fopenr(metapath+1,"w+");
if(!metafile) {
brintf("Could not open metafile for %s for deletion, bailing?\n",path);
return -EIO;
}
safe_flock(fileno(metafile),LOCK_EX,metapath+1);
char hash[23];
hashname(path,hash);
char putpath[1024];
strlcpy(putpath,PENDINGDIR,1024);
strlcat(putpath,"/",1024);
strlcat(putpath,hash,1024);
brintf("The path I would unlink would be: %s\n",putpath);
int unl=unlink(putpath); //if this fails, that's fine.
brintf("Unlink of possible put file? %d\n",unl);
char dirplace[1024];
strlcpy(dirplace,DIRUPLOADS,1024); // ".crestfs_dirblah"
strlcat(dirplace,"/",1024); //".crestfs_dirblah/"
strlcat(dirplace,hash,1024); //".crestfs_dirblah/01cb9f21"
unl=unlink(dirplace);
brintf("Unlink of possible put file's pending directory? Name: %s %d\n",dirplace,unl);
httpsocket pointless=http_request(path,"DELETE",0,"unlink",0,0);
if(!http_valid(pointless)) {
fclose(metafile);
return -EAGAIN;
}
char *resultheaders=0;
recv_headers(&pointless,&resultheaders);
wastebody(pointless);
http_close(&pointless);
if((resultheaders && fetchstatus(resultheaders) >=200 && fetchstatus(resultheaders) <300)|| unl==0) {
delete_from_parents(path);
free(resultheaders);
fclose(metafile);
return 0;
} else {
brintf("FALIURE Unlinking: %s\n",resultheaders);
printf("deletion HTTP request failed for %s: %s",path,resultheaders);
fclose(metafile);
printf("You neither deleted a putable file, nor something off the server.\n");
return -EIO;
}
}
static int
crest_rmdir(const char *path)
{
//unlink path+1
char metapath[1024];
char slashedpath[1024];
strlcpy(slashedpath,path,1024);
strlcat(slashedpath,"/",1024);
strlcpy(metapath,METAPREPEND,1024);
strlcat(metapath,path,1024);
strlcat(metapath,DIRCACHEFILE,1024);
FILE *metafile=fopenr(metapath+1,"w+");
if(!metafile) {
brintf("Could not open metafile for %s for deletion, bailing?\n",path);
return -EIO;
}
safe_flock(fileno(metafile),LOCK_EX,metapath+1);
char hash[23];
hashname(path,hash);
char putpath[1024];
strlcpy(putpath,PENDINGDIR,1024);
strlcat(putpath,"/",1024);
strlcat(putpath,hash,1024);
brintf("The path I would unlink would be: %s\n",putpath);
int unl=unlink(putpath); //if this fails, that's fine.
brintf("Unlink of possible put file? %d\n",unl);
char penddir[1024];
strlcpy(penddir,DIRUPLOADS,1024);
strlcat(penddir,"/",1024);
strlcat(penddir,hash,1024);
int dunl=unlink(penddir);
(void)dunl;
brintf("Unlinked pending-directory file: %s: results: %d\n",penddir,dunl);
httpsocket pointless=http_request(slashedpath,"DELETE",0,"unlink",0,0);
if(!http_valid(pointless)) {
fclose(metafile);
return -EAGAIN;
}
char *resultheaders=0;
recv_headers(&pointless,&resultheaders);
wastebody(pointless);
http_close(&pointless);
if((resultheaders && fetchstatus(resultheaders) >=200 && fetchstatus(resultheaders) <300)|| unl==0) {
//we should toss our DATA-DATA directory (which is going to be getting into other's way)
//and our METADATA directory (which will do the same)
delete_from_parents(path);
free(resultheaders);
fclose(metafile);
return 0;
} else {
brintf("FALIURE Unlinking: %s\n",resultheaders);
printf("deletion HTTP request failed for %s: %s",path,resultheaders);
fclose(metafile);
printf("You neither deleted a putable file, nor something off the server.\n");
return -EIO;
}
}
static int
crest_mkdir(const char* path,mode_t mode __attribute__((unused)))
{
char dirpath[1024];
//char *resultheaders=0;
strlcpy(dirpath,path,1024);
strlcat(dirpath,"/",1024);
append_parents(path);
//should unlink my own metadeata, no?
char mymeta[1024];
strlcpy(mymeta,METAPREPEND,1024);
strlcat(mymeta,path,1024);
int res=unlink(mymeta+1); //unlink my plain-jane metadata file, if it existed (whew!)
(void)res;
brintf("I tried to unlink my personal metadata file: %s and got %d\n",mymeta+1,res);
res=mkdir(mymeta+1,0700);
brintf("Just tried to make my metadata directory %s and got %d\n",mymeta+1,res);
res=mkdir(path+1,0700); //boom. Just cut number of HTTP requests in HALF. HALF baby.
brintf("And making my directory-directory resulted in: %d, here's the dir we tried to make: %s, and here's errno: %s",
res,path+1,strerror(errno));
//we are re-using dirpath, above.
//it looks like this: /domainname/dirname/dirname/
strlcat(dirpath,DIRCACHEFILE,1024); //so it'll have two slashes. So what. Shut up.
freshen_metadata(dirpath,200,"Content-type: x.vnd.bespin-corp/directory-manifest");
//make our metadata look nice 'n' fresh!
//optimistically hope for directory manifest, we can fail back to text/html pretty easily
//need a directory *contents* file (size zero is fine)
FILE *dircache=0;
if((dircache=fopen(dirpath+1,"w"))) {
brintf("Made the file cache, closing it\n");
fclose(dircache);
} else {
brintf("Failed to make a de dir cache, sad: Filename: %s\n",dirpath+1);
}
markdirty(path); //make the symlink!
return 0;
}
static int
crest_symlink(const char *link, const char *path)
{
/*
symlink(symlinktarget,symlinkfile)
=->
NB -
relative link - symlinktarget="poo"
absolute link - symlinktarget="/crestmountpoint/domainname/directory/file"
absolute out-of-tree - "/tmp/something/something"
relative, walkey ="../../../whoknows/what/it/is"
either file:// or http:// - out of tree is file:// ?
*/
//this whole nifty 'resolve target' thing has to be scrapped for now
/* char resolvedpath[PATH_MAX]="";
realpath(link,resolvedpath);
brintf("symlinking %s to %s, resolves to: %s\n",path,link,resolvedpath);
if(strncmp(resolvedpath,cachedirname,strlen(cachedirname))!=0) { //for now only permit symlinks back into CREST-space...
brintf("Not starting with cachedir: %s\n",cachedirname);
return -EACCES;
}
char newtarget[1024]="";
strlcpy(newtarget,"http://",1024);
strlcat(newtarget,resolvedpath+strlen(cachedirname)+2,1024);
*/ //what a mess
brintf("SYMLINKIN: %s -> %s\n",path+1,link);
char locheader[1024]="Location: ";
//should unlink my own metadeata, no? COPY-PASE FROM DIRECTORY THING ABOVE
if(link[0]=='/') {
//absolute symlink, how do we handle this?
//there are a few options:
// #1) Symlink points to somewhere within same *host* e.g.
// /http/samplehost.com/testfile -> /http/samplehost.com/linktarget
// Translate to:
// Location: /linktarget
// ?
// #2) Symlink points to somewhere on DIFFERENT host e.g.
// /http/samplehost.com/testfile -> /http/differenthost.com/linktarget
// Translate to:
// Location: http://differenthost.com/linktarget
// #3) Symlink points outside of crest-fs - e.g.
// /http/samplehost.com/testfile -> /etc/passwd
// Translate to:
// Location: file:///etc/passwd
// Option 3 we will just not permit to start with.
// Answer: Wrap up everything in option #2 (which slighly subsumes #1)
// For posterity's sake, here's what a relative symlink looks like:
// #4) Relative symlink (necessarily points within CREST-fs)
// /http/samplehost.com/testfile -> linktarget
// Translates to:
// Location: linktarget
if(strncmp(link,rootdir,strlen(rootdir))!=0 || link[strlen(rootdir)]!='/') {
brintf("Can't symlink outside of CREST-fs\n");
return -EACCES;
}
//option 3 is now rejected.
strlcat(locheader,"http://",1024);
strlcat(locheader,link+strlen(rootdir)+1,1024);
brintf("Calulated Location Header is: %s\n",locheader);
} else {
//relative link? Super easy.
strlcat(locheader,link,1024);
}
int res=symlink(link,path+1); //let the caching handle this till we start doing stuff async
if(res==0) {
append_parents(path);
markdirty(path);
freshen_metadata(path,302,locheader); //be prepared to pass Location header over...otherwise these symlinks won't resolve
//int res=unlink(mymeta+1); //unlink my plain-jane metadata file, if it existed (whew!)
//(void)res;
//brintf("(SYMLINK) I tried to unlink my personal metadata file: %s and got %d\n",mymeta+1,res);
} else {
brintf("Failed to make symlink: %s\n",strerror(errno));
return -EIO;
}
return 0;
}
static struct fuse_operations crest_filesystem_operations = {
.init = crest_init, /* mostly to keep access to cache, and initialize the putting_routine() */
.getattr = crest_getattr, /* To provide size, permissions, etc. */
.readlink= crest_readlink,/* to handle funny server redirects */
.open = crest_open, /* To enforce read-only access. */
.release = crest_release, /* to hold on to a filehandle to the cache so that reads are consistent with one generation of the file */
.read = crest_read, /* To provide file content. */
.readdir = crest_readdir, /* To provide directory listing. */
.write = crest_write, /* to write data, of course */
.truncate= crest_trunc,
//.create = crest_create,
.mknod = crest_mknod, /* mostly just for creating files */
.mkdir = crest_mkdir, /* what do you think it's for, smart guy? */
.rmdir = crest_rmdir,
.symlink = crest_symlink,
.chmod = crest_chmod, //do-nothings
.chown = crest_chown, //ditto
.utime = crest_utime, //same-a-rino
.unlink = crest_unlink,
/*
.rename = MOVE - not liking new verbs today. maybe not. maybe DELETE followed by PUT
.statfs - would be nice but I don't know how that would work....
.flush??????????
.fsync?
*/
};
/********************** Test routines **********************/
#define HOSTLEN 64
#define PATHLEN 1024
void pathtest(char *fullpath)
{
char host[HOSTLEN];
char path[PATHLEN];
pathparse(fullpath,host,path,HOSTLEN,PATHLEN);
brintf("Okay, from path '%s' host is: '%s' and path is: '%s'\n",fullpath,host,path);
}
void hdrtest(char *header,char *name)
{
char pooh[90];
fetchheader(header,name,pooh,80);
brintf("Header name: %s: value: %s\n",name,pooh);
}
void strtest()
{
char buffera[32];
char bufferb[32];
char bufferc[64];
int result=0;
result=strlcpy(bufferb,"Hello",32);
brintf("strlcpy: %s, %d",bufferb,result);
result=strlcpy(buffera,"HelloHelloHelloHelloHelloHelloHello",32);
brintf("strlcpy: %s, %d",buffera,result);
result= strlcat(bufferc,buffera,64);
brintf("Strlcat: %s, %d",bufferc,result);
result= strlcat(bufferc,buffera,64);
brintf("strlcat: %s, %d",bufferc,result);
result= strlcat(bufferc,buffera,64);
brintf("strlcat: %s, %d",bufferc,result);
}
void pretest()
{
char buf[1024*1024*1024];
/* pathtest("/desk.nu");
pathtest("/desk.nu/pooh.html");
pathtest("/desk.nu/braydix");
pathtest("/desk.nu/braydix/"); */
//exit(0);
//REGEX TESTING STUFF:
/* if(status) {
char error[80];
regerror(status,&re,error,80);
brintf("error: %s\n",error);
} else {
brintf("NO FAIL!!!!!!!!!!!\n");
}
exit(0);
regfree(&re); */
//webfetch("/desk.nu/braydix",buf,DIRBUFFER,"HEAD","");
hdrtest(buf,"connection");
hdrtest(buf,"Scheissen");
hdrtest(buf,"etag");
hdrtest(buf,"date");
hdrtest(buf,"content-type");
hdrtest(buf,"sErVeR");
brintf("Header status: %d\n",fetchstatus(buf));
brintf("Lookit: %s\n",buf);
strtest();
exit(0);
}
void authtest()
{
char myauthstring[1024];
fill_authorization("Dontcare",myauthstring,1024);
printf("Authorization string is: %s\n",myauthstring);
fill_authorization("my.lightdesktop.com/something/something",myauthstring,1024);
printf("THen it's: %s\n",myauthstring);
exit(0);
}
/********************** END TESTING **********************/
void
addparam(int *argc,char ***argv,char *string)
{
char **previous=*argv;
int newsize=(sizeof(char **))*(*argc+1);
int i;
//brintf("BEFORE\n");
for(i=0;i<*argc;i++) {
//brintf("[%d] %s, ",i,(*argv)[i]);
}
//brintf("\n");
*argv=malloc(newsize);
//brintf("malloc'ed: %d\n",newsize);
if(*argc!=0) {
int prevsize=(sizeof(char **))*(*argc);
//brintf("Previous size: %d\n",prevsize);
//brintf("previous sub-zero is: %s\n",previous[0]);
memcpy(*argv,previous,prevsize);
free(previous);