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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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