input/nfs: new plugin using libnfs

1 files changed, 202 insertions, 0 deletions

diff --git a/src/input/plugins/NfsInputPlugin.cxx b/src/input/plugins/NfsInputPlugin.cxx
new file mode 100644
index 000000000..0380c8c10
--- /dev/null
+++ b/src/input/plugins/NfsInputPlugin.cxx
@@ -0,0 +1,202 @@
+/*
+ * 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 "util/StringUtil.hxx"
+#include "util/Error.hxx"
+#include "util/Domain.hxx"
+
+extern "C" {
+#include <nfsc/libnfs.h>
+}
+
+#include <sys/stat.h>
+#include <fcntl.h>
+
+static constexpr Domain nfs_domain("nfs");
+
+class NfsInputStream {
+	InputStream base;
+
+	nfs_context *ctx;
+	nfsfh *fh;
+
+public:
+	NfsInputStream(const char *uri,
+		       Mutex &mutex, Cond &cond,
+		       nfs_context *_ctx, nfsfh *_fh,
+		       InputStream::offset_type size)
+		:base(input_plugin_nfs, uri, mutex, cond),
+		 ctx(_ctx), fh(_fh) {
+		base.ready = true;
+		base.seekable = true;
+		base.size = size;
+	}
+
+	~NfsInputStream() {
+		nfs_close(ctx, fh);
+		nfs_destroy_context(ctx);
+	}
+
+	InputStream *GetBase() {
+		return &base;
+	}
+
+	bool IsEOF() const {
+		return base.offset >= base.size;
+	}
+
+	size_t Read(void *ptr, size_t size, Error &error) {
+		int nbytes = nfs_read(ctx, fh, size, (char *)ptr);
+		if (nbytes < 0) {
+			error.SetErrno(-nbytes, "nfs_read() failed");
+			nbytes = 0;
+		}
+
+		return nbytes;
+	}
+
+	bool Seek(InputStream::offset_type offset, int whence, Error &error) {
+		uint64_t current_offset;
+		int result = nfs_lseek(ctx, fh, offset, whence, &current_offset);
+		if (result < 0) {
+			error.SetErrno(-result, "smbc_lseek() failed");
+			return false;
+		}
+
+		base.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;
+	}
+
+	auto is = new NfsInputStream(uri, mutex, cond, ctx, fh, st.st_size);
+	return is->GetBase();
+}
+
+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 void
+input_nfs_close(InputStream *is)
+{
+	NfsInputStream *s = (NfsInputStream *)is;
+	delete s;
+}
+
+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,
+	input_nfs_close,
+	nullptr,
+	nullptr,
+	nullptr,
+	nullptr,
+	input_nfs_read,
+	input_nfs_eof,
+	input_nfs_seek,
+};