Mercurial > crates > systemd-socket

annotate src/resolv_addr.rs @ 6:a7893294e9b2

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Make the crate compilable on non-linux systems This makes the crate compile on other operating systems. Since systemd is only supported on Linux, it simply disables systemd features on other systems. The API is still the same, just parsing `systemd://` string will return an error.
author Martin Habovstiak <martin.habovstiak@gmail.com>
date Fri, 27 Nov 2020 16:15:57 +0100
parents 66c0e10c89fc
children cfef4593e207
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1 use thiserror::Error;
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2 use std::fmt;
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3
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4 #[derive(Debug, PartialEq)]
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5 pub(crate) struct ResolvAddr(String);
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7 impl ResolvAddr {
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8 pub(crate) fn as_str(&self) -> &str {
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9 &self.0
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10 }
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12 pub(crate) fn try_from_generic<T: std::ops::Deref<Target=str> + Into<String>>(string: T) -> Result<Self, ResolvAddrError> {
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13 // can't use a combinator due to borrowing
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14 let colon = match string.rfind(':') {
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15 Some(colon) => colon,
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16 None => return Err(ResolvAddrError::MissingPort(string.into())),
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17 };
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18
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19 let (hostname, port) = string.split_at(colon);
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20
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21 if let Err(error) = port[1..].parse::<u16>() {
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22 return Err(ResolvAddrError::InvalidPort { string: string.into(), error, });
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23 }
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24
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25 let len = hostname.len();
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26 if len > 253 {
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27 return Err(ResolvAddrError::TooLong { string: string.into(), len, } )
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28 }
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29
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30 let mut label_start = 0usize;
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32 for (i, c) in hostname.chars().enumerate() {
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33 match c {
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34 '.' => {
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35 if i - label_start == 0 {
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36 return Err(ResolvAddrError::EmptyLabel { string: string.into(), label_start, });
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37 }
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38
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39 label_start = i + 1;
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40 },
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41 'a'..='z' | 'A'..='Z' | '0'..='9' | '-' => (),
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42 _ => return Err(ResolvAddrError::InvalidCharacter { string: string.into(), c, pos: i, }),
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43 }
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44
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45 if i - label_start > 63 {
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46 return Err(ResolvAddrError::LongLabel { string: string.into(), label_start, label_end: i, });
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47 }
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48 }
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50 Ok(ResolvAddr(string.into()))
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51 }
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52 }
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54 impl fmt::Display for ResolvAddr {
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55 fn fmt(&self, f: &mut fmt::Formatter) -> fmt::Result {
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56 fmt::Display::fmt(&self.0, f)
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57 }
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58 }
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61 #[derive(Debug, Error)]
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62 pub(crate) enum ResolvAddrError {
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63 #[error("hostname {string} has {len} character which exceeds the limit of 253")]
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64 TooLong { string: String, len: usize },
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65 #[error("invalid character {c} in hostname {string} at position {pos}")]
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66 InvalidCharacter { string: String, pos: usize, c: char, },
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67 #[error("hostname {string} contains a label {} at position {label_start} which is {} characters long - more than the limit 63", &string[(*label_start)..(*label_end)], label_end - label_start)]
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68 LongLabel { string: String, label_start: usize, label_end: usize, },
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69 #[error("hostname {string} contains an empty label at position {label_start}")]
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70 EmptyLabel { string: String, label_start: usize, },
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71 #[error("the address {0} is missing a port")]
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72 MissingPort(String),
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73 #[error("failed to parse port numer in the address {string}")]
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74 InvalidPort { string: String, error: std::num::ParseIntError, },
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75 }