NetBSD-5.0.2/share/examples/refuse/ian/ian/ian.c
/*
* Copyright © 2007 Alistair Crooks. All rights reserved.
*
* Redistribution and use in source and binary forms, with or without
* modification, are permitted provided that the following conditions
* are met:
* 1. Redistributions of source code must retain the above copyright
* notice, this list of conditions and the following disclaimer.
* 2. Redistributions in binary form must reproduce the above copyright
* notice, this list of conditions and the following disclaimer in the
* documentation and/or other materials provided with the distribution.
* 3. The name of the author may not be used to endorse or promote
* products derived from this software without specific prior written
* permission.
*
* THIS SOFTWARE IS PROVIDED BY THE AUTHOR ``AS IS'' AND ANY EXPRESS
* OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED
* WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
* ARE DISCLAIMED. IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR ANY
* DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
* DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE
* GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS
* INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY,
* WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING
* NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF THIS
* SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
*/
#include <sys/types.h>
#include <sys/param.h>
#include <sys/stat.h>
#include <err.h>
#include <errno.h>
#include <fcntl.h>
#include <fuse.h>
#include <stdio.h>
#include <stdlib.h>
#include <string.h>
#include <time.h>
#include <unistd.h>
#include "fetch.h"
#include "virtdir.h"
#include "defs.h"
#ifndef DEFAULT_CACHE_DIR
#define DEFAULT_CACHE_DIR "/tmp"
#endif
static char *cachedir; /* location for cached files */
static int verbose; /* how chatty are we? */
static virtdir_t ian;
/* retrieve a file from the remote location, and cache it in cachedir */
static int
getfile(const char *url)
{
struct url_stat urlstat;
struct url *newurlp;
int64_t cc;
char buf[BUFSIZ * 8];
char tmpname[BUFSIZ];
char newurl[BUFSIZ];
char *cp;
FILE *out;
FILE *fp;
int got;
int ret;
int fd;
if ((cp = strchr(url, ':')) == NULL) {
warn("malformed URL `%s'", url + 1);
return 0;
}
(void) snprintf(newurl, sizeof(newurl), "%.*s/%s",
(int)(cp - url), url + 1, cp + 1);
if ((newurlp = fetchParseURL(newurl)) == NULL) {
/* add as virtdir */
virtdir_add(&ian, newurl, strlen(newurl), 'd', "", strlen(""));
return 1;
}
if (newurlp->host[0] == 0x0 || strcmp(newurlp->doc, "/") == 0) {
virtdir_add(&ian, newurl, strlen(newurl), 'd', "", strlen(""));
return 1;
}
if ((fp = fetchXGetURL(newurl, &urlstat, "p")) == NULL) {
if (verbose) {
warn("Error [%d] \"%s\" \"%s\"\n", fetchLastErrCode, newurl, fetchLastErrString);
}
/* XXX - before adding as a directory, we should check it does actually exist */
virtdir_add(&ian, newurl, strlen(newurl), 'd', "", strlen(""));
return 1;
}
if (verbose) {
printf("::::::::::\n%s\nSize: %lld\nmtime: %s::::::::::\n",
newurl,
(long long) urlstat.size,
ctime(&urlstat.mtime));
}
(void) snprintf(tmpname, sizeof(tmpname), "%s/fetch.XXXXXX", cachedir);
fd = mkstemp(tmpname);
if ((out = fdopen(fd, "w")) == NULL) {
warnx("can't create output file `%s'", tmpname);
return 0;
}
for (ret = 1, cc = 0 ; (got = fread(buf, 1, sizeof(buf), fp)) > 0 ; cc += got) {
if (fwrite(buf, 1, got, out) != got) {
warnx("short write");
ret = 0;
break;
}
}
(void) fclose(out);
(void) fclose(fp);
if (ret) {
virtdir_add(&ian, newurl, strlen(newurl), 'f', tmpname, strlen(tmpname));
}
return ret;
}
/* perform the stat operation */
/* if this is the root, then just synthesise the data */
/* otherwise, retrieve the data, and be sure to fill in the size */
static int
ian_getattr(const char *path, struct stat *st)
{
virt_dirent_t *ep;
if (strcmp(path, "/") == 0) {
(void) memset(st, 0x0, sizeof(*st));
st->st_mode = S_IFDIR | 0755;
st->st_nlink = 2;
return 0;
}
if ((ep = virtdir_find(&ian, path + 1, strlen(path) - 1)) == NULL) {
if (!getfile(path)) {
return -ENOENT;
}
ep = virtdir_find(&ian, path + 1, strlen(path) - 1);
}
switch(ep->type) {
case 'f':
(void) memcpy(st, &ian.file, sizeof(*st));
if (stat(ep->tgt, st) < 0) {
warn("`%s' has gone", ep->tgt);
}
break;
case 'd':
(void) memcpy(st, &ian.dir, sizeof(*st));
break;
case 'l':
(void) memcpy(st, &ian.lnk, sizeof(*st));
st->st_size = ep->tgtlen;
break;
}
return 0;
}
/* readdir operation */
static int
ian_readdir(const char *path, void *buf, fuse_fill_dir_t filler,
off_t offset, struct fuse_file_info * fi)
{
virt_dirent_t *dp;
VIRTDIR *dirp;
if ((dirp = openvirtdir(&ian, path)) == NULL) {
return 0;
}
filler(buf, ".", NULL, 0);
filler(buf, "..", NULL, 0);
while ((dp = readvirtdir(dirp)) != NULL) {
filler(buf, dp->d_name, NULL, 0);
}
closevirtdir(dirp);
return 0;
}
/* open the file in the file system */
static int
ian_open(const char *path, struct fuse_file_info * fi)
{
return 0;
}
/* read the file's contents in the file system */
static int
ian_read(const char *path, char *buf, size_t size, off_t offset,
struct fuse_file_info * fi)
{
virt_dirent_t *ep;
int cc;
int fd;
if ((ep = virtdir_find(&ian, path + 1, strlen(path) - 1)) == NULL) {
return -ENOENT;
}
if ((fd = open(ep->tgt, O_RDONLY, 0666)) < 0) {
return -EACCES;
}
if (lseek(fd, offset, SEEK_SET) < 0) {
(void) close(fd);
return -EBADF;
}
if ((cc = read(fd, buf, size)) < 0) {
(void) close(fd);
return -EBADF;
}
(void) close(fd);
return cc;
}
/* fill in the statvfs struct */
static int
ian_statfs(const char *path, struct statvfs *st)
{
(void) memset(st, 0x0, sizeof(*st));
return 0;
}
/* read the symbolic link */
static int
ian_readlink(const char *path, char *buf, size_t size)
{
virt_dirent_t *ep;
if ((ep = virtdir_find(&ian, path, strlen(path))) == NULL) {
return -ENOENT;
}
if (ep->tgt == NULL) {
return -ENOENT;
}
(void) strlcpy(buf, ep->tgt, size);
return 0;
}
/* operations struct */
static struct fuse_operations ian_oper = {
.getattr = ian_getattr,
.readlink = ian_readlink,
.readdir = ian_readdir,
.open = ian_open,
.read = ian_read,
.statfs = ian_statfs
};
int
main(int argc, char **argv)
{
int i;
cachedir = strdup(DEFAULT_CACHE_DIR);
while ((i = getopt(argc, argv, "v")) != -1) {
switch(i) {
case 'd':
(void) free(cachedir);
cachedir = strdup(optarg);
break;
case 'v':
verbose += 1;
break;
default:
warn("unrecognised option `%c'", i);
exit(EXIT_FAILURE);
}
}
(void) daemon(1, 1);
virtdir_add(&ian, "ftp:", strlen("ftp:"), 'd', "", 0);
virtdir_add(&ian, "http:", strlen("http:"), 'd', "", 0);
virtdir_add(&ian, "https:", strlen("https:"), 'd', "", 0);
return fuse_main(argc, argv, &ian_oper, NULL);
}