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/*
* Copyright (C) 2003-2014 The Music Player Daemon Project
* http://www.musicpd.org
*
* This program is free software; you can redistribute it and/or modify
* it under the terms of the GNU General Public License as published by
* the Free Software Foundation; either version 2 of the License, or
* (at your option) any later version.
*
* This program is distributed in the hope that it will be useful,
* but WITHOUT ANY WARRANTY; without even the implied warranty of
* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
* GNU General Public License for more details.
*
* You should have received a copy of the GNU General Public License along
* with this program; if not, write to the Free Software Foundation, Inc.,
* 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA.
*/
#include "config.h"
#include "NfsInputPlugin.hxx"
#include "../InputStream.hxx"
#include "../InputPlugin.hxx"
#include "lib/nfs/Domain.hxx"
#include "util/StringUtil.hxx"
#include "util/Error.hxx"
extern "C" {
#include <nfsc/libnfs.h>
}
#include <string.h>
#include <sys/stat.h>
#include <fcntl.h>
class NfsInputStream final : public InputStream {
nfs_context *ctx;
nfsfh *fh;
public:
NfsInputStream(const char *_uri,
Mutex &_mutex, Cond &_cond,
nfs_context *_ctx, nfsfh *_fh,
InputStream::offset_type _size)
:InputStream(input_plugin_nfs, _uri, _mutex, _cond),
ctx(_ctx), fh(_fh) {
seekable = true;
size = _size;
SetReady();
}
~NfsInputStream() {
nfs_close(ctx, fh);
nfs_destroy_context(ctx);
}
bool IsEOF() const {
return offset >= size;
}
size_t Read(void *ptr, size_t read_size, Error &error) {
int nbytes = nfs_read(ctx, fh, read_size, (char *)ptr);
if (nbytes < 0) {
error.SetErrno(-nbytes, "nfs_read() failed");
nbytes = 0;
}
return nbytes;
}
bool Seek(InputStream::offset_type new_offset, int whence, Error &error) {
uint64_t current_offset;
int result = nfs_lseek(ctx, fh, new_offset, whence,
¤t_offset);
if (result < 0) {
error.SetErrno(-result, "smbc_lseek() failed");
return false;
}
offset = current_offset;
return true;
}
};
/*
* InputPlugin methods
*
*/
static InputStream *
input_nfs_open(const char *uri,
Mutex &mutex, Cond &cond,
Error &error)
{
if (!StringStartsWith(uri, "nfs://"))
return nullptr;
uri += 6;
const char *slash = strchr(uri, '/');
if (slash == nullptr) {
error.Set(nfs_domain, "Malformed nfs:// URI");
return nullptr;
}
const std::string server(uri, slash);
uri = slash;
slash = strrchr(uri + 1, '/');
if (slash == nullptr || slash[1] == 0) {
error.Set(nfs_domain, "Malformed nfs:// URI");
return nullptr;
}
const std::string mount(uri, slash);
uri = slash;
nfs_context *ctx = nfs_init_context();
if (ctx == nullptr) {
error.Set(nfs_domain, "nfs_init_context() failed");
return nullptr;
}
int result = nfs_mount(ctx, server.c_str(), mount.c_str());
if (result < 0) {
nfs_destroy_context(ctx);
error.SetErrno(-result, "nfs_mount() failed");
return nullptr;
}
nfsfh *fh;
result = nfs_open(ctx, uri, O_RDONLY, &fh);
if (result < 0) {
nfs_destroy_context(ctx);
error.SetErrno(-result, "nfs_open() failed");
return nullptr;
}
struct stat st;
result = nfs_fstat(ctx, fh, &st);
if (result < 0) {
nfs_close(ctx, fh);
nfs_destroy_context(ctx);
error.SetErrno(-result, "nfs_fstat() failed");
return nullptr;
}
return new NfsInputStream(uri, mutex, cond, ctx, fh, st.st_size);
}
static size_t
input_nfs_read(InputStream *is, void *ptr, size_t size,
Error &error)
{
NfsInputStream &s = *(NfsInputStream *)is;
return s.Read(ptr, size, error);
}
static bool
input_nfs_eof(InputStream *is)
{
NfsInputStream &s = *(NfsInputStream *)is;
return s.IsEOF();
}
static bool
input_nfs_seek(InputStream *is,
InputPlugin::offset_type offset, int whence,
Error &error)
{
NfsInputStream &s = *(NfsInputStream *)is;
return s.Seek(offset, whence, error);
}
const InputPlugin input_plugin_nfs = {
"nfs",
nullptr,
nullptr,
input_nfs_open,
nullptr,
nullptr,
nullptr,
nullptr,
input_nfs_read,
input_nfs_eof,
input_nfs_seek,
};
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