|
Message-ID: <20200227144523.GE11469@brightrain.aerifal.cx> Date: Thu, 27 Feb 2020 09:45:23 -0500 From: Rich Felker <dalias@...c.org> To: musl@...ts.openwall.com Subject: Re: getaddrinfo(3) with AI_V4MAPPED and AI_ALL flags On Thu, Feb 27, 2020 at 01:17:20PM +0300, Alexander Scherbatiy wrote: > Hello, > > When I call getaddrinfo() with different families, SOCK_STREAM > socktype, IPPROTO_TCP protocol, and AI_PASSIVE flag the result is > the same on the Alpine Linux 3.11.3 and Ubuntu 19.10 (the code > sample is below): > > ---------------- > > family: AF_UNSPEC, flags: AI_PASSIVE > AF_INET IPv4 addr '0.0.0.0' > AF_INET6 IPv6 addr '::' > > family: AF_INET, flags: AI_PASSIVE > AF_INET IPv4 addr '0.0.0.0' > > family: AF_INET6, flags: AI_PASSIVE > AF_INET6 IPv6 addr '::' > > ---------------- > > When I use getaddrinfo() with AF_INET6 family and additional > AI_V4MAPPED | AI_ALL (return both IPv6 and IPv4-mapped IPv6 > addresses) flags the result on Ubuntu contains only IPv6 '::' > address: > > ---------------- > > family: AF_INET6, flags: AI_PASSIVE | AI_V4MAPPED | AI_ALL > AF_INET6 IPv6 addr '::' > > ---------------- > > whereas the result on Alpine Linux contains both IPv4-mapped IPv6 > addresses '::ffff:0.0.0.0' and IPv6 '::' > > ---------------- > > family: AF_INET6, flags: AI_PASSIVE | AI_V4MAPPED | AI_ALL > AF_INET6 IPv6 addr '::ffff:0.0.0.0' > AF_INET6 IPv6 addr '::' > > ---------------- > > Is it expected behavior? > > I use Alpine Linux 3.11.3 from docker with musl libc (x86_64). The musl behavior is as intended and I think it's more correct. If net.ipv6.bindv6only sysctl is enabled, binding using the glibc results would fail to accept ipv4 connections. Rich
Powered by blists - more mailing lists
Confused about mailing lists and their use? Read about mailing lists on Wikipedia and check out these guidelines on proper formatting of your messages.