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rpc: avoid use of cgo by hard-coding maxPathSize (#27447)

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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>
This commit is contained in:
Koichi Shiraishi 2023-06-19 15:06:58 +09:00 committed by GitHub
parent e4660a1181
commit f0b5af74a3
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GPG Key ID: 4AEE18F83AFDEB23
3 changed files with 8 additions and 62 deletions
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34
rpc/constants_unix.go
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@ -1,34 +0,0 @@
// Copyright 2019 The go-ethereum Authors
// This file is part of the go-ethereum library.
//
// The go-ethereum library is free software: you can redistribute it and/or modify
// it under the terms of the GNU Lesser General Public License as published by
// the Free Software Foundation, either version 3 of the License, or
// (at your option) any later version.
//
// The go-ethereum library 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 Lesser General Public License for more details.
//
// You should have received a copy of the GNU Lesser General Public License
// along with the go-ethereum library. If not, see <http://www.gnu.org/licenses/>.
//go:build darwin || dragonfly || freebsd || linux || nacl || netbsd || openbsd || solaris
// +build darwin dragonfly freebsd linux nacl netbsd openbsd solaris
package rpc
/*
#include <sys/un.h>
int max_socket_path_size() {
struct sockaddr_un s;
return sizeof(s.sun_path);
}
*/
import "C"
var (
max_path_size = C.max_socket_path_size()
)

26
rpc/constants_unix_nocgo.go
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@ -1,26 +0,0 @@
// Copyright 2019 The go-ethereum Authors
// This file is part of the go-ethereum library.
//
// The go-ethereum library is free software: you can redistribute it and/or modify
// it under the terms of the GNU Lesser General Public License as published by
// the Free Software Foundation, either version 3 of the License, or
// (at your option) any later version.
//
// The go-ethereum library 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 Lesser General Public License for more details.
//
// You should have received a copy of the GNU Lesser General Public License
// along with the go-ethereum library. If not, see <http://www.gnu.org/licenses/>.
//go:build !cgo && !windows
// +build !cgo,!windows
package rpc
var (
// On Linux, sun_path is 108 bytes in size
// see http://man7.org/linux/man-pages/man7/unix.7.html
max_path_size = 108
)

10
rpc/ipc_unix.go
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@ -29,11 +29,17 @@ import (
"github.com/ethereum/go-ethereum/log" "github.com/ethereum/go-ethereum/log"
) )
const (
// On Linux, sun_path is 108 bytes in size
// see http://man7.org/linux/man-pages/man7/unix.7.html
maxPathSize = int(108)
)
// ipcListen will create a Unix socket on the given endpoint. // ipcListen will create a Unix socket on the given endpoint.
func ipcListen(endpoint string) (net.Listener, error) { func ipcListen(endpoint string) (net.Listener, error) {
// account for null-terminator too // account for null-terminator too
if len(endpoint)+1 > int(max_path_size) { if len(endpoint)+1 > maxPathSize {
log.Warn(fmt.Sprintf("The ipc endpoint is longer than %d characters. ", max_path_size-1), log.Warn(fmt.Sprintf("The ipc endpoint is longer than %d characters. ", maxPathSize-1),
"endpoint", endpoint) "endpoint", endpoint)
} }