mirror of https://github.com/caddyserver/caddy.git
57 lines
2.1 KiB
Go
57 lines
2.1 KiB
Go
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// Copyright 2015 Matthew Holt and The Caddy Authors
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//
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// Licensed under the Apache License, Version 2.0 (the "License");
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// you may not use this file except in compliance with the License.
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// You may obtain a copy of the License at
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//
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// http://www.apache.org/licenses/LICENSE-2.0
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//
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// Unless required by applicable law or agreed to in writing, software
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// distributed under the License is distributed on an "AS IS" BASIS,
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// WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
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// See the License for the specific language governing permissions and
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// limitations under the License.
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package internal
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import (
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"fmt"
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"io/fs"
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"strconv"
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"strings"
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)
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// SplitUnixSocketPermissionsBits takes a unix socket address in the
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// unusual "path|bits" format (e.g. /run/caddy.sock|0222) and tries
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// to split it into socket path (host) and permissions bits (port).
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// Colons (":") can't be used as separator, as socket paths on Windows
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// may include a drive letter (e.g. `unix/c:\absolute\path.sock`).
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// Permission bits will default to 0200 if none are specified.
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// Throws an error, if the first carrying bit does not
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// include write perms (e.g. `0422` or `022`).
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// Symbolic permission representation (e.g. `u=w,g=w,o=w`)
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// is not supported and will throw an error for now!
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func SplitUnixSocketPermissionsBits(addr string) (path string, fileMode fs.FileMode, err error) {
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addrSplit := strings.SplitN(addr, "|", 2)
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if len(addrSplit) == 2 {
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// parse octal permission bit string as uint32
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fileModeUInt64, err := strconv.ParseUint(addrSplit[1], 8, 32)
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if err != nil {
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return "", 0, fmt.Errorf("could not parse octal permission bits in %s: %v", addr, err)
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}
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fileMode = fs.FileMode(fileModeUInt64)
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// FileMode.String() returns a string like `-rwxr-xr--` for `u=rwx,g=rx,o=r` (`0754`)
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if string(fileMode.String()[2]) != "w" {
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return "", 0, fmt.Errorf("owner of the socket requires '-w-' (write, octal: '2') permissions at least; got '%s' in %s", fileMode.String()[1:4], addr)
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}
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return addrSplit[0], fileMode, nil
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}
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// default to 0200 (symbolic: `u=w,g=,o=`)
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// if no permission bits are specified
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return addr, 0200, nil
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}
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