[pkg-fetchmail-maint] Bug#361825: fetchmail: Insufficient connect error messages for multi-IP hosts (was: Connection vom an IPv4-only-host to an IPv6/IPv4-Host doesn't work)

[Matthias Andree]

package fetchmail
retitle 361825 Insufficient connect error messages for multi-IP hosts
severity 361825 minor
tags 361825 confirmed
thanks

Greetings,

This looks rather like an inaccurate/incomplete error reporting of fetchmail's
rather than a genuine bug. The SockOpen() function will retry *ALL* addresses
it obtained with their respective address families, so it has probably tried
IPv4 first, got "connection refused" or something, then tried IPv6 last and
returned only the EAFNOSUPPORT error.

Example that shows that fetchmail will try IPv4 sockets for IPv4 addresses:

| $ LC_MESSAGES=C FETCHMAILHOME=/tmp strace -econnect,socket fetchmail -p pop3 -vv localhost --auth ssh
| ...
| socket(PF_INET, SOCK_STREAM, IPPROTO_IP) = 3
| connect(3, {sa_family=AF_INET, sin_port=htons(110), sin_addr=inet_addr("127.0.0.1")}, 16) = -1 ECONNREFUSED (Connection refused)
| socket(PF_INET6, SOCK_STREAM, IPPROTO_IP) = 3
| connect(3, {sa_family=AF_INET6, sin6_port=htons(110), inet_pton(AF_INET6, "::1", &sin6_addr), sin6_flowinfo=0, sin6_scope_id=0}, 28) = -1 ECONNREFUSED (Connection refused)
| POP3 connection to localhost failed: Connection refused
| fetchmail: 6.3.4+svn querying localhost (protocol POP3) at Mi 10 Mai 2006 12:45:02 CEST: poll completed

In conclusion, the title is wrong.  I am retitling the bug.
The fix will have to be that fetchmail logs every attempt and the result
in order to not mislead the user.  Severity adjusted to minor.

Regards,

-- 
Matthias Andree