Commit Graph

6 Commits

Author SHA1 Message Date
rofl0r
d888e4ebf4 add test for getnameinfo 2012-12-17 23:22:25 +01:00
rofl0r
af5c6f0c6a replace hostent lookup with better performing in-memory copy.
the central dns resolver function proxy_gethostbyname() used
to iterate over the gethostent() db (/etc/hosts) on each dns
request.
since this is not threadsafe, we synchronized access to it
previously using mutexes. the parsing of this file is slow,
and blocking all threads to do it even moreso.
since gethostent_r() is only available on a few platforms,
i decided to read the hostent db once and then use a quick
in-memory lookup on further usage.

+ some further refactoring.
2012-11-08 01:18:19 +01:00
rofl0r
c698d48c03 move stringfromipv4 into common.c 2012-11-07 22:00:03 +01:00
rofl0r
25afe98b20 failed attempt to use shared memory for the ip <-> dns mapping
this is in order to get irssi, which forks for DNS lookups,
and similar programs, to work as intended.

in a previous attempt i learned that shared memory created in a
child process is not visible to the parent;
in this attempt i spin off a thread from the parent which listens
on a pipe and manages the shared memory allocation from the parent
address-space. however this doesnt work as expected:
memory allocated in the parent after the child forked is not visi-
ble to the child as well.

so what happens is: irssi starts a child process, the thread allocs
memory and hands it to the child, the child attempts to write and
segfaults. however irssi doesnt crash. since now the memory is
already allocated, doing the dns lookup again will succeed.

i.e. the dns lookup works now in irssi by luck.
all but the first dns lookups will suceed.

however this is not good enough for me to be satisfied, i commit
this only for documentation purposes.
2012-11-07 16:49:14 +01:00
rofl0r
8ce1e51a60 add some test/debug programs 2012-11-04 05:10:50 +01:00
rofl0r
6f56956715 add test for getaddrinfo 2012-07-16 01:21:22 +02:00