Date: Fri, 30 Apr 2021 15:26:13 -0230 From: Julian Squires <julian@...ht.net> To: musl@...ts.openwall.com Cc: Julian Squires <julian@...ht.net>, Bob Richmond <robert.richmond@...enwavesystems.com> Subject: [PATCH] handle linux-specific errors in getaddrinfo AI_ADDRCONFIG linux allows adding ip rules with actions such as RTN_PROHIBIT or RTN_BLACKHOLE to the loopback interface, e.g.: ip -6 rule add from all iif lo lookup unspec prohibit if the loopback interface also has ipv6 disabled: sysctl net/ipv6/conf/lo/disable_ipv6=1 the connect() in getaddrinfo will return EACCES or EINVAL, respectively, and getaddrinfo will erroneously return early. this may sound like a perverse misconfiguration, but it happens easily on openwrt systems where ipv6 has been disabled, as openwrt's netifd by default sets up these rules (with a custom RTN_POLICY_FAILED action, which behaves like RTN_PROHIBIT in this case). Signed-off-by: Julian Squires <julian@...ht.net> Co-authored-by: Bob Richmond <robert.richmond@...enwavesystems.com> --- src/network/getaddrinfo.c | 2 ++ 1 file changed, 2 insertions(+) diff --git a/src/network/getaddrinfo.c b/src/network/getaddrinfo.c index efaab306..9a9c3cbc 100644 --- a/src/network/getaddrinfo.c +++ b/src/network/getaddrinfo.c @@ -76,6 +76,8 @@ int getaddrinfo(const char *restrict host, const char *restrict serv, const stru case EHOSTUNREACH: case ENETDOWN: case ENETUNREACH: + case EACCES: + case EINVAL: break; default: return EAI_SYSTEM; -- 2.31.1
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