WiFidog编译成openwrt 库文件

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本文介绍如何在OpenWrt环境下构建wifidog_lib库，包括目录结构搭建、Makefile编写、源代码修改等内容，并提供了详细的步骤说明及示例。

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1) 在package/ utils下创建wifidog_lib目录。在wifidog_lib目录下创建一个文件夹src和一个Makefile文件。Makefile文件编写内容如下：

#
# Copyright (C) 2006,2013 OpenWrt.org
#
# This is free software, licensed under the GNU General Public License v2.
# See /LICENSE for more information.
#
include $(TOPDIR)/rules.mk 

PKG_NAME:=wifidog_lib
PKG_VERSION:=20130917

PKG_BUILD_DIR := $(BUILD_DIR)/$(PKG_NAME)

include $(INCLUDE_DIR)/package.mk

define Package/wifidog_lib
  SECTION:=utils
  CATEGORY:=Utilities
  DEPENDS:=+iptables-mod-extra +iptables-mod-ipopt +iptables-mod-nat-extra +libpthread
  TITLE:=A wireless captive portal solution
endef

define Package/wifidog_lib/description
      The Wifidog project is a complete and embeddable captive
      portal solution for wireless community groups or individuals
      who wish to open a free Hotspot while still preventing abuse
      of their Internet connection.
endef

define Build/Prepare
      mkdir -p $(PKG_BUILD_DIR)
      $(CP) ./src/* $(PKG_BUILD_DIR)/
endef

define Build/Configure
endef

define Build/Compile
      $(MAKE) -C $(PKG_BUILD_DIR) \
           CC="$(TARGET_CC)" \
           CFLAGS="$(TARGET_CFLAGS) -Wall" \
           LDFLAGS="$(TARGET_LDFLAGS)"
endef

define Package/wifidog_lib/conffiles
    /etc/wifidog.conf
endef

define Package/wifidog_lib/install
      $(INSTALL_DIR) $(1)/usr/bin
      $(INSTALL_BIN) $(PKG_BUILD_DIR)/test_wifidog $(1)/usr/bin/
      $(INSTALL_DIR) $(1)/usr/lib
      $(CP) $(PKG_BUILD_DIR)/libwifidog.so* $(1)/usr/lib/
      $(INSTALL_DIR) $(1)/etc
      $(INSTALL_DATA) $(PKG_BUILD_DIR)/wifidog.conf $(1)/etc/
endef

$(eval $(call BuildPackage,wifidog_lib))

2) 解压wifidog包进入src目录
tar xzvf wifidog-20130917-440445db60b0c3aff528ea703a828b0567293387.tar.gz –C src

3) 在src下创建Makefile文件，内容如下

LIB_VERMAJOR = 0
LIB_VERMINOR = 1
LIB_FILENAME = libhttpd.so

LIBWIFIDOG_FILENAME = libwifidog.so

OBJEXT = o

CFLAGS += -Os -pipe -mno-branch-likely -mips32r2 -mtune=34kc -fno-caller-saves -fhonour-copts -Wno-error=unused-but-set-variable -msoft-float

LIB_CFLAGS  = $(CFLAGS) -shared -fPIC -DPIC
LIB_LDFLAGS = $(LDFLAGS) -Wl,-soname,$(LIB_FILENAME).$(LIB_VERMAJOR).$(LIB_VERMINOR)
LIBWIFIDOG_LDFLAGS = $(LDFLAGS) -Wl,-soname,$(LIBWIFIDOG_FILENAME).$(LIB_VERMAJOR).$(LIB_VERMINOR)

wifidog_OBJECTS = src/conf.$(OBJEXT) src/commandline.$(OBJEXT)\
  src/debug.$(OBJEXT) src/fw_iptables.$(OBJEXT) src/firewall.$(OBJEXT) \
  src/gateway.$(OBJEXT) src/centralserver.$(OBJEXT) src/http.$(OBJEXT) \
  src/auth.$(OBJEXT) src/client_list.$(OBJEXT) src/util.$(OBJEXT) \
  src/wdctl_thread.$(OBJEXT) src/ping_thread.$(OBJEXT) src/safe.$(OBJEXT) \
  src/httpd_thread.$(OBJEXT) src/wifidogapi.$(OBJEXT)

wdctl_OBJECTS = src/wdctl.$(OBJEXT)

LIB_OBJ = libhttpd/protocol.o libhttpd/api.o libhttpd/version.o libhttpd/ip_acl.o

DEFS = -DHAVE_CONFIG_H
DEFAULT_INCLUDES = -I.-I..
sysconfdir = /etc
AM_CPPFLAGS += \
  -I./libhttpd/ \
  -DSYSCONFDIR='"$(sysconfdir)"'

COMPILE = $(CC) $(DEFS) $(DEFAULT_INCLUDES) $(INCLUDES) $(AM_CPPFLAGS) \
  $(CPPFLAGS) $(AM_CFLAGS) $(CFLAGS)
LTCOMPILE = $(LIBTOOL) --tag=CC $(AM_LIBTOOLFLAGS) $(LIBTOOLFLAGS) \
  --mode=compile $(CC) $(DEFS) $(DEFAULT_INCLUDES) $(INCLUDES) \
  $(AM_CPPFLAGS) $(CPPFLAGS) $(AM_CFLAGS) $(CFLAGS)
CCLD = $(CC)
LINK = $(CCLD) $(AM_CFLAGS) $(CFLAGS) $(AM_LDFLAGS) \
  $(LDFLAGS) -o $@

wifidog_LDADD = libhttpd/$(LIB_FILENAME).$(LIB_VERMAJOR).$(LIB_VERMINOR)

LIBS = -lnsl -lpthread


all: Makefile   libhttpd   libwifidog test_wifidog

test_wifidog: src/test_wifidog.o libhttpd libwifidog
  @rm -f test_wifidog
  $(LINK) src/test_wifidog.o $(LIBWIFIDOG_FILENAME).$(LIB_VERMAJOR).$(LIB_VERMINOR)  $(LIBS)

wdctl: $(wdctl_OBJECTS) libhttpd
  @rm -f wdctl
  $(LINK) $(wdctl_OBJECTS) $(wdctl_LDADD) $(LIBS)
wifidog_test: $(wifidog_OBJECTS) libhttpd
  @rm -f wifidog_test
  $(LINK) $(wifidog_OBJECTS) $(wifidog_LDADD) $(LIBS)          

libhttpd:$(LIB_OBJ) ./libhttpd/httpd_priv.h ./libhttpd/httpd.h
  $(CC) $(LIB_CFLAGS) $(LIB_LDFLAGS) $(LIB_OBJ) $(LIBS) \
       -o libhttpd/$(LIB_FILENAME).$(LIB_VERMAJOR).$(LIB_VERMINOR)

libwifidog:$(wifidog_OBJECTS) $(wdctl_OBJECTS) $(LIB_OBJ) ./libhttpd/httpd_priv.h ./libhttpd/httpd.h
  $(CC) $(LIB_CFLAGS) $(LIBWIFIDOG_LDFLAGS) $(LIB_OBJ) $(wifidog_OBJECTS) $(wdctl_OBJECTS) $(LIBS) \
       -o $(LIBWIFIDOG_FILENAME).$(LIB_VERMAJOR).$(LIB_VERMINOR)

.c.o:
    $(CC) $(DEFS) $(AM_CPPFLAGS) $(DEFAULT_INCLUDES) $(INCLUDES) $(CFLAGS) -MD -fPIC -DPIC -c -o $@ $<


clean:
  rm -f  $(LIB_FILENAME)*

4) 修改src下对应的源代码，同时把scripts/init.d/wifidog脚本提供的功能通过lib库提供,这样 lib库需要提供int wifidogstart()，int wifidogstop()，int wifidogreload()，int wifidogrestart()。make package/wifidog_lib/compile V=s进行编译生成libwifidog.so.0.1和测试程序test_wifidog。