Commit Graph

119 Commits

Author SHA1 Message Date
rofl0r
d0abc93c74 preliminary first fork-safe version
instead of allocating memory in the child, we now use the allocator
thread to do all the necessary allocations himself.
additionally we provide a clean API to query the ip <-> dns mapping.
these functions connect via a pipe to the allocator thread, and
exchange messages.

further cleanup is needed, but it seems to work so far.
thread-safety is not yet guaranteed.

closes #1
2012-11-07 21:31:11 +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
7bca3ba5ef main.c: fixed forgotten initialization for second loop using i
this caused the combination of -q -f somefile to not find the dll
in the current dir, because it started iterating the directory
list with 2 instead of 0.
2012-11-04 06:14:33 +01:00
rofl0r
f011ff99dd update .gitignore 2012-11-04 05:26:34 +01:00
rofl0r
e05cafc8e2 put a mutex lock around gethostent() usage, to prevent internal
races. the external usage was covered by the latest commit.
2012-11-04 05:23:51 +01:00
rofl0r
8ce1e51a60 add some test/debug programs 2012-11-04 05:10:50 +01:00
rofl0r
2d58820635 proxy_gethostbyname: fix thread safety issues arising from ...
gethostent() usage.

also set hostent.h_aliases member to a valid pointer.
2012-11-04 05:02:57 +01:00
rofl0r
b851b39a37 add RcB tags to core.h
this is handy as it allows me to do quick testprograms using my RcB program,
without specifying dozens of things on the command line.
2012-11-04 05:01:38 +01:00
rofl0r
e8d49b02e8 gethostbyaddr hook: also set aliases.
i inspected behaviour of libc's and they all seem to set a valid
h_aliases pointer, of which the first one should be NULL, if no
aliases exist.
2012-11-04 04:58:48 +01:00
rofl0r
859dabb302 common.h: supply a default for SYSCONFDIR if not passed via CFLAGS 2012-11-04 04:57:45 +01:00
rofl0r
6f35888528 fix issues with pthread and dlsym symbols on ubuntu 12.04
for some reason, the linker needs --no-as-needed for both
libdl and libpthread.

closes #4

thanks to @tomsawyer for discovering this.

the proposed -pthread change was not needed though,
and this is a good thing since it seems not portable.
2012-11-04 01:21:29 +01:00
rofl0r
bddb79a286 fix bug which lead to segfault in ubuntu 12.04 telnet
it called gethostbyname and expected that the h->h_name was set.

this code path here which gets only active if the passed name
equals the gethostname() result failed to set a couple of values.

additionally fixed usage of strncpy, which causes the entire
memory buffer to be written, even when the string is much shorter.

a similar bugfix was independently discovered by semion laptev, but my
version is threadsafe - his version introduces a new static buffer,
even though we have plenty of thread-safe space reserved exactly
for this usage case, thus causing a regression.
2012-11-04 01:00:58 +01:00
rofl0r
c2c719e25d fix AUTHORS. it wrongly assigned some work to the wrong author.
localnet was written by jianingy
poll_retry() by coling cross.
2012-09-02 01:58:15 +02:00
rofl0r
6515bc4d82 Merge pull request #3 from guanqun/master
fix typo in help message
2012-08-27 14:46:05 -07:00
guanqun
bbf8b7aab0 fix typo in help message 2012-08-27 23:30:45 +08:00
rofl0r
01b8c81e90 add some default localnets (commented) to config 2012-08-16 16:44:51 +02:00
rofl0r
ddd9e48fc1 update README for 4.1 release 2012-08-06 01:34:23 +02:00
rofl0r
923c4f1026 fix core.h to be usable on its own 2012-08-06 01:26:34 +02:00
rofl0r
108610e30e core.c: add getservbyname_r replacement function for mac 2012-08-06 01:26:03 +02:00
rofl0r
0f1bc719fd put base64 variable to the place it gets used 2012-08-04 17:55:37 +02:00
rofl0r
068e088a8b tunnel_to: use better suited type 2012-08-03 10:43:59 +02:00
rofl0r
40bb78b53f fix omission in common.c 2012-07-16 02:42:09 +02:00
rofl0r
a4f3dd0538 Makefile: put config into new install-config target 2012-07-16 02:36:35 +02:00
rofl0r
80e58726e2 correct copyright of main.c 2012-07-16 02:36:35 +02:00
rofl0r
3c7fcc7507 update AUTHORS 2012-07-16 02:36:35 +02:00
rofl0r
ab3ca31871 getaddrinfo: cosmetics 2012-07-16 01:34:00 +02:00
rofl0r
6f56956715 add test for getaddrinfo 2012-07-16 01:21:22 +02:00
rofl0r
037edbcb8e proxy_getaddrinfo: fix segfault when hints is NULL 2012-07-16 01:19:30 +02:00
rofl0r
40edf758ee make getaddrinfo threadsafe 2012-07-16 01:05:28 +02:00
rofl0r
4b999cdae7 use threadsafe getservbyname_r 2012-07-14 17:59:56 +02:00
rofl0r
71e15e2edd simplify log func 2012-07-14 17:59:06 +02:00
rofl0r
e5e87c8f22 put abort functionality into get_config_path to further reduce code duplication 2012-07-08 23:47:56 +02:00
rofl0r
fafeaf5936 remove unused file 2012-07-08 23:34:34 +02:00
rofl0r
fba5f5694c use config file lookup routine from a common place 2012-07-08 23:32:50 +02:00
rofl0r
1a02b9f82f update README 2012-07-08 21:44:02 +02:00
rofl0r
3004240462 slightly better error message 2012-07-08 21:23:39 +02:00
rofl0r
364c785970 print everything to stderr, and fflush on PDEBUG 2012-07-08 04:18:42 +02:00
rofl0r
1fc7e38ee0 fixup for d95ef42d48 2012-07-08 04:09:50 +02:00
rofl0r
eb0db7221a configure: add --help text 2012-07-08 00:35:59 +02:00
rofl0r
2c9c4d9da7 simplify load_sym code and remove potential aliasing violation. 2012-07-08 00:27:46 +02:00
rofl0r
d95ef42d48 externalize some variables, which are used from both C files 2012-07-08 00:16:00 +02:00
Jahrome
229eb7cc5a bugfix: localnet never used if no port specified. Fix typo. 2012-05-22 23:11:03 +02:00
rofl0r
45f50ac754 cosmetic fix 2012-04-24 02:04:02 +02:00
rofl0r
d72e668767 use sane defaults 2012-04-24 01:48:17 +02:00
rofl0r
561679fbcd remove dead code 2012-04-24 01:46:57 +02:00
rofl0r
bc23ef8f46 fix debug message 2012-04-23 22:56:44 +02:00
rofl0r
88a54e872a use dynloader to call init() func when gcc is available, and lock it properly 2012-04-23 22:21:40 +02:00
rofl0r
caed782652 macros 2012-04-23 22:21:40 +02:00
rofl0r
f55c6bc4d5 fix PDEBUG macro 2012-04-23 22:21:40 +02:00
rofl0r
49293b180d some cleanup in core.h 2012-04-23 20:26:13 +02:00