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experimental new feature: proxy_dns_daemon

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since many users complain about issues with modern, ultracomplex
clusterfuck software such as chromium, nodejs, etc, i've reconsidered
one of my original ideas how to implement remote dns lookup support.
instead of having a background thread serving requests via a pipe,
the user manually starts a background daemon process before running
proxychains, and the two processes then communicate via UDP.
this requires much less hacks (like hooking of close() to prevent
pipes from getting closed) and doesn't need to call any async-signal
unsafe code like malloc(). this means it should be much more compatible
than the previous method, however it's not as practical and slightly
slower.

it's recommended that the proxychains4-daemon runs on localhost, and
if you use proxychains-ng a lot you might want to set ip up as a service
that starts on boot. a single proxychains4-daemon should theoretically
be able to serve many parallel proxychains4 instances, but this has not
yet been tested so far. it's also possible to run the daemon on other
computers, even over internet, but currently there is no error-checking/
timeout code at all; that means the UDP connection needs to be very
stable.

the library code used for the daemon sources are from my projects
libulz[0] and htab[1], and the server code is loosely based on
microsocks[2]. their licenses are all compatible with the GPL.
if not otherwise mentioned, they're released for this purpose under
the standard proxychains-ng license (see COPYING).

[0]: https://github.com/rofl0r/libulz
[1]: https://github.com/rofl0r/htab
[2]: https://github.com/rofl0r/microsocks
This commit is contained in:
rofl0r
2020-09-23 22:00:29 +01:00
parent 1e00b9ac1e
commit 7fe8139496
18 changed files with 979 additions and 45 deletions
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25
Makefile
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@ -13,13 +13,18 @@ includedir = $(prefix)/include
libdir = $(prefix)/lib
sysconfdir=$(prefix)/etc
SRCS = $(sort $(wildcard src/*.c))
OBJS = $(SRCS:.c=.o)
OBJS = src/common.o src/main.o
DOBJS = src/daemon/hsearch.o \
src/daemon/sblist.o src/daemon/sblist_delete.o \
src/daemon/daemon.o src/daemon/udpserver.o
LOBJS = src/nameinfo.o src/version.o \
src/core.o src/common.o src/libproxychains.o \
src/allocator_thread.o \
src/allocator_thread.o src/rdns.o \
src/hostsreader.o src/hash.o src/debug.o
GENH = src/version.h
CFLAGS += -Wall -O0 -g -std=c99 -D_GNU_SOURCE -pipe
@ -41,7 +46,8 @@ LDSO_PATHNAME = libproxychains4.$(LDSO_SUFFIX)
SHARED_LIBS = $(LDSO_PATHNAME)
ALL_LIBS = $(SHARED_LIBS)
PXCHAINS = proxychains4
ALL_TOOLS = $(PXCHAINS)
PXCHAINS_D = proxychains4-daemon
ALL_TOOLS = $(PXCHAINS) $(PXCHAINS_D)
ALL_CONFIGS = src/proxychains.conf
-include config.mak
@ -70,7 +76,7 @@ install-config: $(ALL_CONFIGS:src/%=$(DESTDIR)$(sysconfdir)/%)
clean:
rm -f $(ALL_LIBS)
rm -f $(ALL_TOOLS)
rm -f $(OBJS)
rm -f $(OBJS) $(LOBJS) $(DOBJS)
rm -f $(GENH)
src/version.h: $(wildcard VERSION .git)
@ -83,10 +89,13 @@ src/version.o: src/version.h
$(LDSO_PATHNAME): $(LOBJS)
$(CC) $(LDFLAGS) $(LD_SET_SONAME)$(LDSO_PATHNAME) $(USER_LDFLAGS) \
-shared -o $@ $(LOBJS) $(SOCKET_LIBS)
-shared -o $@ $^ $(SOCKET_LIBS)
$(ALL_TOOLS): $(OBJS)
$(CC) src/main.o src/common.o $(USER_LDFLAGS) $(LIBDL) -o $(PXCHAINS)
$(PXCHAINS): $(OBJS)
$(CC) $^ $(USER_LDFLAGS) $(LIBDL) -o $@
$(PXCHAINS_D): $(DOBJS)
$(CC) $^ $(USER_LDFLAGS) -o $@
.PHONY: all clean install install-config install-libs install-tools