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A C library for asynchronous DNS requests (grpc依赖)
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c-ares/README.md

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put logo in readme
9 months ago
# [![c-ares logo](https://c-ares.org/art/c-ares-logo.svg)](https://c-ares.org/)
Avoid buffer overflow in RC4 loop comparison (#336) The rc4 function iterates over a buffer of size buffer_len who's maximum value is INT_MAX with a counter of type short that is not guaranteed to have maximum size INT_MAX. In circumstances where short is narrower than int and where buffer_len is larger than the maximum value of a short, it may be possible to loop infinitely as counter will overflow and never be greater than or equal to buffer_len. The solution is to make the comparison be between types of equal width. This commit defines counter as an int. Fix By: Fionn Fitzmaurice (@fionn)
4 years ago
badge should be only main branch
9 months ago
[![Build Status](https://api.cirrus-ci.com/github/c-ares/c-ares.svg?branch=main)](https://cirrus-ci.com/github/c-ares/c-ares)
branch main
6 months ago
[![Windows Build Status](https://ci.appveyor.com/api/projects/status/aevgc5914tm72pvs/branch/main?svg=true)](https://ci.appveyor.com/project/c-ares/c-ares/branch/main)
fix coveralls badge
6 months ago
[![Coverage Status](https://coveralls.io/repos/github/c-ares/c-ares/badge.svg?branch=main)](https://coveralls.io/github/c-ares/c-ares?branch=main)
Avoid buffer overflow in RC4 loop comparison (#336) The rc4 function iterates over a buffer of size buffer_len who's maximum value is INT_MAX with a counter of type short that is not guaranteed to have maximum size INT_MAX. In circumstances where short is narrower than int and where buffer_len is larger than the maximum value of a short, it may be possible to loop infinitely as counter will overflow and never be greater than or equal to buffer_len. The solution is to make the comparison be between types of equal width. This commit defines counter as an int. Fix By: Fionn Fitzmaurice (@fionn)
4 years ago
[![CII Best Practices](https://bestpractices.coreinfrastructure.org/projects/291/badge)](https://bestpractices.coreinfrastructure.org/projects/291)
[![Fuzzing Status](https://oss-fuzz-build-logs.storage.googleapis.com/badges/c-ares.svg)](https://bugs.chromium.org/p/oss-fuzz/issues/list?sort=-opened&can=1&q=proj:c-ares)
new badges
1 year ago
[![Bugs](https://sonarcloud.io/api/project_badges/measure?project=c-ares_c-ares&metric=bugs)](https://sonarcloud.io/summary/new_code?id=c-ares_c-ares)
[![Coverity Scan Status](https://scan.coverity.com/projects/c-ares/badge.svg)](https://scan.coverity.com/projects/c-ares)
Avoid buffer overflow in RC4 loop comparison (#336) The rc4 function iterates over a buffer of size buffer_len who's maximum value is INT_MAX with a counter of type short that is not guaranteed to have maximum size INT_MAX. In circumstances where short is narrower than int and where buffer_len is larger than the maximum value of a short, it may be possible to loop infinitely as counter will overflow and never be greater than or equal to buffer_len. The solution is to make the comparison be between types of equal width. This commit defines counter as an int. Fix By: Fionn Fitzmaurice (@fionn)
4 years ago
document some RFCs in use
5 months ago
- [Overview](#overview)
- [Code](#code)
- [Communication](#communication)
- [Release Keys](#release-keys)
- [Verifying signatures](#verifying-signatures)
- [Features](#features)
- [RFCs and Proposals](#supported-rfcs-and-proposals)
update base README
6 months ago
## Overview
[c-ares](https://c-ares.org) is a modern DNS (stub) resolver library, written in
C. It provides interfaces for asynchronous queries while trying to abstract the
intricacies of the underlying DNS protocol. It was originally intended for
Avoid buffer overflow in RC4 loop comparison (#336) The rc4 function iterates over a buffer of size buffer_len who's maximum value is INT_MAX with a counter of type short that is not guaranteed to have maximum size INT_MAX. In circumstances where short is narrower than int and where buffer_len is larger than the maximum value of a short, it may be possible to loop infinitely as counter will overflow and never be greater than or equal to buffer_len. The solution is to make the comparison be between types of equal width. This commit defines counter as an int. Fix By: Fionn Fitzmaurice (@fionn)
4 years ago
applications which need to perform DNS queries without blocking, or need to
update base README
6 months ago
perform multiple DNS queries in parallel.
Avoid buffer overflow in RC4 loop comparison (#336) The rc4 function iterates over a buffer of size buffer_len who's maximum value is INT_MAX with a counter of type short that is not guaranteed to have maximum size INT_MAX. In circumstances where short is narrower than int and where buffer_len is larger than the maximum value of a short, it may be possible to loop infinitely as counter will overflow and never be greater than or equal to buffer_len. The solution is to make the comparison be between types of equal width. This commit defines counter as an int. Fix By: Fionn Fitzmaurice (@fionn)
4 years ago
update base README
6 months ago
One of the goals of c-ares is to be a better DNS resolver than is provided by
your system, regardless of which system you use. We recommend using
the c-ares library in all network applications even if the initial goal of
asynchronous resolution is not necessary to your application.
Avoid buffer overflow in RC4 loop comparison (#336) The rc4 function iterates over a buffer of size buffer_len who's maximum value is INT_MAX with a counter of type short that is not guaranteed to have maximum size INT_MAX. In circumstances where short is narrower than int and where buffer_len is larger than the maximum value of a short, it may be possible to loop infinitely as counter will overflow and never be greater than or equal to buffer_len. The solution is to make the comparison be between types of equal width. This commit defines counter as an int. Fix By: Fionn Fitzmaurice (@fionn)
4 years ago
grammar
6 months ago
c-ares will build with any C89 compiler and is [MIT licensed](LICENSE.md),
update base README
6 months ago
which makes it suitable for both free and commercial software. c-ares runs on
Linux, FreeBSD, OpenBSD, MacOS, Solaris, AIX, Windows, Android, iOS and many
more operating systems.
Avoid buffer overflow in RC4 loop comparison (#336) The rc4 function iterates over a buffer of size buffer_len who's maximum value is INT_MAX with a counter of type short that is not guaranteed to have maximum size INT_MAX. In circumstances where short is narrower than int and where buffer_len is larger than the maximum value of a short, it may be possible to loop infinitely as counter will overflow and never be greater than or equal to buffer_len. The solution is to make the comparison be between types of equal width. This commit defines counter as an int. Fix By: Fionn Fitzmaurice (@fionn)
4 years ago
update base README
6 months ago
c-ares has a strong focus on security, implementing safe parsers and data
builders used throughout the code, thus avoiding many of the common pitfalls
of other C libraries. Through automated testing with our extensive testing
framework, c-ares is constantly validated with a range of static and dynamic
analyzers, as well as being constantly fuzzed by [OSS Fuzz](https://github.com/google/oss-fuzz).
Avoid buffer overflow in RC4 loop comparison (#336) The rc4 function iterates over a buffer of size buffer_len who's maximum value is INT_MAX with a counter of type short that is not guaranteed to have maximum size INT_MAX. In circumstances where short is narrower than int and where buffer_len is larger than the maximum value of a short, it may be possible to loop infinitely as counter will overflow and never be greater than or equal to buffer_len. The solution is to make the comparison be between types of equal width. This commit defines counter as an int. Fix By: Fionn Fitzmaurice (@fionn)
4 years ago
update base README
6 months ago
While c-ares has been around for over 20 years, it has been actively maintained
both in regards to the latest DNS RFCs as well as updated to follow the latest
best practices in regards to C coding standards.
Avoid buffer overflow in RC4 loop comparison (#336) The rc4 function iterates over a buffer of size buffer_len who's maximum value is INT_MAX with a counter of type short that is not guaranteed to have maximum size INT_MAX. In circumstances where short is narrower than int and where buffer_len is larger than the maximum value of a short, it may be possible to loop infinitely as counter will overflow and never be greater than or equal to buffer_len. The solution is to make the comparison be between types of equal width. This commit defines counter as an int. Fix By: Fionn Fitzmaurice (@fionn)
4 years ago
update base README
6 months ago
## Code
Avoid buffer overflow in RC4 loop comparison (#336) The rc4 function iterates over a buffer of size buffer_len who's maximum value is INT_MAX with a counter of type short that is not guaranteed to have maximum size INT_MAX. In circumstances where short is narrower than int and where buffer_len is larger than the maximum value of a short, it may be possible to loop infinitely as counter will overflow and never be greater than or equal to buffer_len. The solution is to make the comparison be between types of equal width. This commit defines counter as an int. Fix By: Fionn Fitzmaurice (@fionn)
4 years ago
update base README
6 months ago
The full source code and revision history is available in our
[GitHub repository](https://github.com/c-ares/c-ares). Our signed releases
no quotes
6 months ago
are available in the [release archives](https://c-ares.org/download/).
Avoid buffer overflow in RC4 loop comparison (#336) The rc4 function iterates over a buffer of size buffer_len who's maximum value is INT_MAX with a counter of type short that is not guaranteed to have maximum size INT_MAX. In circumstances where short is narrower than int and where buffer_len is larger than the maximum value of a short, it may be possible to loop infinitely as counter will overflow and never be greater than or equal to buffer_len. The solution is to make the comparison be between types of equal width. This commit defines counter as an int. Fix By: Fionn Fitzmaurice (@fionn)
4 years ago
update base README
6 months ago
See the [INSTALL.md](INSTALL.md) file for build information.
Avoid buffer overflow in RC4 loop comparison (#336) The rc4 function iterates over a buffer of size buffer_len who's maximum value is INT_MAX with a counter of type short that is not guaranteed to have maximum size INT_MAX. In circumstances where short is narrower than int and where buffer_len is larger than the maximum value of a short, it may be possible to loop infinitely as counter will overflow and never be greater than or equal to buffer_len. The solution is to make the comparison be between types of equal width. This commit defines counter as an int. Fix By: Fionn Fitzmaurice (@fionn)
4 years ago
update base README
6 months ago
## Communication
Avoid buffer overflow in RC4 loop comparison (#336) The rc4 function iterates over a buffer of size buffer_len who's maximum value is INT_MAX with a counter of type short that is not guaranteed to have maximum size INT_MAX. In circumstances where short is narrower than int and where buffer_len is larger than the maximum value of a short, it may be possible to loop infinitely as counter will overflow and never be greater than or equal to buffer_len. The solution is to make the comparison be between types of equal width. This commit defines counter as an int. Fix By: Fionn Fitzmaurice (@fionn)
4 years ago
update base README
6 months ago
**Issues** and **Feature Requests** should be reported to our
[GitHub Issues](https://github.com/c-ares/c-ares/issues) page.
Avoid buffer overflow in RC4 loop comparison (#336) The rc4 function iterates over a buffer of size buffer_len who's maximum value is INT_MAX with a counter of type short that is not guaranteed to have maximum size INT_MAX. In circumstances where short is narrower than int and where buffer_len is larger than the maximum value of a short, it may be possible to loop infinitely as counter will overflow and never be greater than or equal to buffer_len. The solution is to make the comparison be between types of equal width. This commit defines counter as an int. Fix By: Fionn Fitzmaurice (@fionn)
4 years ago
update base README
6 months ago
**Discussions** around c-ares and its use, are held on
[GitHub Discussions](https://github.com/c-ares/c-ares/discussions/categories/q-a)
or the [Mailing List](https://lists.haxx.se/mailman/listinfo/c-ares). Mailing
List archive [here](https://lists.haxx.se/pipermail/c-ares/).
Please, do not mail volunteers privately about c-ares.
Avoid buffer overflow in RC4 loop comparison (#336) The rc4 function iterates over a buffer of size buffer_len who's maximum value is INT_MAX with a counter of type short that is not guaranteed to have maximum size INT_MAX. In circumstances where short is narrower than int and where buffer_len is larger than the maximum value of a short, it may be possible to loop infinitely as counter will overflow and never be greater than or equal to buffer_len. The solution is to make the comparison be between types of equal width. This commit defines counter as an int. Fix By: Fionn Fitzmaurice (@fionn)
4 years ago
update base README
6 months ago
**Security vulnerabilities** are treated according to our
[Security Procedure](SECURITY.md), please email c-ares-security at
haxx.se if you suspect one.
Avoid buffer overflow in RC4 loop comparison (#336) The rc4 function iterates over a buffer of size buffer_len who's maximum value is INT_MAX with a counter of type short that is not guaranteed to have maximum size INT_MAX. In circumstances where short is narrower than int and where buffer_len is larger than the maximum value of a short, it may be possible to loop infinitely as counter will overflow and never be greater than or equal to buffer_len. The solution is to make the comparison be between types of equal width. This commit defines counter as an int. Fix By: Fionn Fitzmaurice (@fionn)
4 years ago
release keys
6 months ago
## Release keys
Avoid buffer overflow in RC4 loop comparison (#336) The rc4 function iterates over a buffer of size buffer_len who's maximum value is INT_MAX with a counter of type short that is not guaranteed to have maximum size INT_MAX. In circumstances where short is narrower than int and where buffer_len is larger than the maximum value of a short, it may be possible to loop infinitely as counter will overflow and never be greater than or equal to buffer_len. The solution is to make the comparison be between types of equal width. This commit defines counter as an int. Fix By: Fionn Fitzmaurice (@fionn)
4 years ago
release keys
6 months ago
Primary GPG keys for c-ares Releasers (some Releasers sign with subkeys):
* **Daniel Stenberg** <<daniel@haxx.se>>
`27EDEAF22F3ABCEB50DB9A125CC908FDB71E12C2`
* **Brad House** <<brad@brad-house.com>>
`DA7D64E4C82C6294CB73A20E22E3D13B5411B7CA`
To import the full set of trusted release keys (including subkeys possibly used
to sign releases):
```bash
gpg --keyserver hkps://keyserver.ubuntu.com --recv-keys 27EDEAF22F3ABCEB50DB9A125CC908FDB71E12C2 # Daniel Stenberg
gpg --keyserver hkps://keys.openpgp.org --recv-keys DA7D64E4C82C6294CB73A20E22E3D13B5411B7CA # Brad House
```
add verification section
6 months ago
### Verifying signatures
For each release `c-ares-X.Y.Z.tar.gz` there is a corresponding
`c-ares-X.Y.Z.tar.gz.asc` file which contains the detached signature for the
release.
After fetching all of the possible valid signing keys and loading into your
keychain as per the prior section, you can simply run the command below on
the downloaded package and detached signature:
```bash
% gpg -v --verify c-ares-1.29.0.tar.gz.asc c-ares-1.29.0.tar.gz
gpg: enabled compatibility flags:
gpg: Signature made Fri May 24 02:50:38 2024 EDT
gpg: using RSA key 27EDEAF22F3ABCEB50DB9A125CC908FDB71E12C2
gpg: using pgp trust model
gpg: Good signature from "Daniel Stenberg <daniel@haxx.se>" [unknown]
gpg: WARNING: This key is not certified with a trusted signature!
gpg: There is no indication that the signature belongs to the owner.
Primary key fingerprint: 27ED EAF2 2F3A BCEB 50DB 9A12 5CC9 08FD B71E 12C2
gpg: binary signature, digest algorithm SHA512, key algorithm rsa2048
```
document some RFCs in use
5 months ago
## Features
### Supported RFCs and Proposals
- [RFC1035](https://datatracker.ietf.org/doc/html/rfc7873).
Initial/Base DNS RFC
- [RFC2671](https://datatracker.ietf.org/doc/html/rfc2671),
[RFC6891](https://datatracker.ietf.org/doc/html/rfc6891).
EDNS0 option (meta-RR)
- [RFC3596](https://datatracker.ietf.org/doc/html/rfc3596).
IPv6 Address. `AAAA` Record.
- [RFC2782](https://datatracker.ietf.org/doc/html/rfc2782).
Server Selection. `SRV` Record.
- [RFC3403](https://datatracker.ietf.org/doc/html/rfc3403).
Naming Authority Pointer. `NAPTR` Record.
- [RFC6698](https://datatracker.ietf.org/doc/html/rfc6698).
DNS-Based Authentication of Named Entities (DANE) Transport Layer Security (TLS) Protocol.
`TLSA` Record.
- [RFC9460](https://datatracker.ietf.org/doc/html/rfc9460).
General Purpose Service Binding, Service Binding type for use with HTTPS.
`SVCB` and `HTTPS` Records.
whitespace
5 months ago
- [RFC7553](https://datatracker.ietf.org/doc/html/rfc7553).
document some RFCs in use
5 months ago
Uniform Resource Identifier. `URI` Record.
- [RFC6844](https://datatracker.ietf.org/doc/html/rfc6844).
Certification Authority Authorization. `CAA` Record.
- [RFC2535](https://datatracker.ietf.org/doc/html/rfc2535),
[RFC2931](https://datatracker.ietf.org/doc/html/rfc2931).
`SIG0` Record. Only basic parser, not full implementation.
- [RFC7873](https://datatracker.ietf.org/doc/html/rfc7873),
[RFC9018](https://datatracker.ietf.org/doc/html/rfc9018).
DNS Cookie off-path dns poisoning and amplification mitigation. *In progress*.
- [draft-vixie-dnsext-dns0x20-00](https://datatracker.ietf.org/doc/html/draft-vixie-dnsext-dns0x20-00).
DNS 0x20 query name case randomization to prevent cache poisioning attacks.
- [RFC7686](https://datatracker.ietf.org/doc/html/rfc7686).
Reject queries for `.onion` domain names with `NXDOMAIN`.
- [RFC2606](https://datatracker.ietf.org/doc/html/rfc2606),
[RFC6761](https://datatracker.ietf.org/doc/html/rfc6761).
Special case treatment for `localhost`/`.localhost`.
- [RFC2308](https://datatracker.ietf.org/doc/html/rfc2308),
[RFC9520](https://datatracker.ietf.org/doc/html/rfc9520).
Negative Caching of DNS Resolution Failures.
- [RFC6724](https://datatracker.ietf.org/doc/html/rfc6724).
IPv6 address sorting as used by `ares_getaddrinfo()`.