Add new package libpacketmark, a LD_PRELOAD library to manipulate packet marks
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include $(TOPDIR)/rules.mk
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PKG_NAME:=libpacketmark
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PKG_VERSION:=1
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PKG_BUILD_DIR := $(BUILD_DIR)/$(PKG_NAME)
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include $(INCLUDE_DIR)/package.mk
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define Package/libpacketmark
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SECTION:=libs
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CATEGORY:=Libraries
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TITLE:=Set default packet mark via LD_PRELOAD
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DEPENDS:=
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endef
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define Build/Prepare
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mkdir -p $(PKG_BUILD_DIR)
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$(CP) ./src/* $(PKG_BUILD_DIR)/
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endef
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define Build/Configure
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endef
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define Build/Compile
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CFLAGS="$(TARGET_CFLAGS)" CPPFLAGS="$(TARGET_CPPFLAGS)" $(MAKE) -C $(PKG_BUILD_DIR) $(TARGET_CONFIGURE_OPTS)
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endef
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define Package/libpacketmark/install
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$(INSTALL_DIR) $(1)/usr/lib
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$(CP) $(PKG_BUILD_DIR)/libpacketmark.so $(1)/usr/lib/
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endef
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$(eval $(call BuildPackage,libpacketmark))
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all: libpacketmark.so
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libpacketmark.so: libpacketmark.c
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$(CC) $(CPPFLAGS) $(CFLAGS) $(LDFLAGS) -Wall -nostartfiles -shared -fPIC -o $@ $^ -ldl $(LDLIBS)
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/*
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Copyright (c) 2014, Matthias Schiffer <mschiffer@universe-factory.net>
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All rights reserved.
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Redistribution and use in source and binary forms, with or without
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modification, are permitted provided that the following conditions are met:
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1. Redistributions of source code must retain the above copyright notice,
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this list of conditions and the following disclaimer.
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2. Redistributions in binary form must reproduce the above copyright notice,
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this list of conditions and the following disclaimer in the documentation
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and/or other materials provided with the distribution.
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THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS "AS IS"
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AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
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IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE
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DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT HOLDER OR CONTRIBUTORS BE LIABLE
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FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
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DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR
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SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER
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CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY,
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OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE
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OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
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*/
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#define _GNU_SOURCE
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#include <dlfcn.h>
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#include <errno.h>
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#include <stdlib.h>
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#include <sys/types.h>
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#include <sys/socket.h>
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static int mark;
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static int (*socket_real)(int domain, int type, int protocol);
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void _init(void) {
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const char *str = getenv("LIBPACKETMARK_MARK");
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if (str)
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mark = atoi(str);
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socket_real = dlsym(RTLD_NEXT, "socket");
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}
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int socket(int domain, int type, int protocol) {
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int fd = socket_real(domain, type, protocol);
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if (fd >= 0) {
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int errno_save = errno;
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setsockopt(fd, SOL_SOCKET, SO_MARK, &mark, sizeof(mark));
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errno = errno_save;
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}
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return fd;
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}
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