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f0b5af74a3
Package rpc uses cgo to find the maximum UNIX domain socket path length. If exceeded, a warning is printed. This is the only use of cgo in this package. It seems excessive to depend on cgo just for this warning, so we now hard-code the usual limit for Linux instead. --------- Co-authored-by: Felix Lange <fjl@twurst.com>
63 lines
2.0 KiB
Go
63 lines
2.0 KiB
Go
// Copyright 2015 The go-ethereum Authors
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// This file is part of the go-ethereum library.
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//
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// The go-ethereum library is free software: you can redistribute it and/or modify
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// it under the terms of the GNU Lesser General Public License as published by
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// the Free Software Foundation, either version 3 of the License, or
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// (at your option) any later version.
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//
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// The go-ethereum library is distributed in the hope that it will be useful,
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// but WITHOUT ANY WARRANTY; without even the implied warranty of
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// MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
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// GNU Lesser General Public License for more details.
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//
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// You should have received a copy of the GNU Lesser General Public License
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// along with the go-ethereum library. If not, see <http://www.gnu.org/licenses/>.
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//go:build darwin || dragonfly || freebsd || linux || nacl || netbsd || openbsd || solaris
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// +build darwin dragonfly freebsd linux nacl netbsd openbsd solaris
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package rpc
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import (
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"context"
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"fmt"
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"net"
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"os"
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"path/filepath"
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"github.com/ethereum/go-ethereum/log"
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)
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const (
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// On Linux, sun_path is 108 bytes in size
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// see http://man7.org/linux/man-pages/man7/unix.7.html
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maxPathSize = int(108)
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)
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// ipcListen will create a Unix socket on the given endpoint.
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func ipcListen(endpoint string) (net.Listener, error) {
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// account for null-terminator too
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if len(endpoint)+1 > maxPathSize {
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log.Warn(fmt.Sprintf("The ipc endpoint is longer than %d characters. ", maxPathSize-1),
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"endpoint", endpoint)
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}
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// Ensure the IPC path exists and remove any previous leftover
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if err := os.MkdirAll(filepath.Dir(endpoint), 0751); err != nil {
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return nil, err
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}
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os.Remove(endpoint)
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l, err := net.Listen("unix", endpoint)
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if err != nil {
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return nil, err
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}
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os.Chmod(endpoint, 0600)
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return l, nil
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}
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// newIPCConnection will connect to a Unix socket on the given endpoint.
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func newIPCConnection(ctx context.Context, endpoint string) (net.Conn, error) {
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return new(net.Dialer).DialContext(ctx, "unix", endpoint)
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}
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