Replace CMake with GNU Make.

There was previously support for both build systems, but ndhc is
undemanding and there is no point in maintaining a complex
CMake build.

.gitignore

@@ -1 +1,3 @@
-build/
+*.o
+nk/*.o
+ndhc

CMakeLists.txt

@@ -1,226 +0,0 @@
-cmake_minimum_required(VERSION 3.3)
-if(${CMAKE_VERSION} VERSION_LESS 3.12)
-  cmake_policy(VERSION ${CMAKE_MAJOR_VERSION}.${CMAKE_MINOR_VERSION})
-else()
-  cmake_policy(VERSION 3.12)
-  cmake_policy(SET CMP0118 NEW)
-endif()
-
-project (ndhc DESCRIPTION "dhcp4 client" LANGUAGES C)
-
-####################################
-
-# Computes the realtionship between two version strings.  A version
-# string is a number delineated by '.'s such as 1.3.2 and 0.99.9.1.
-# You can feed version strings with different number of dot versions,
-# and the shorter version number will be padded with zeros: 9.2 <
-# 9.2.1 will actually compare 9.2.0 < 9.2.1.
-#
-# Input: a_in - value, not variable
-#        b_in - value, not variable
-#        result_out - variable with value:
-#                         -1 : a_in <  b_in
-#                          0 : a_in == b_in
-#                          1 : a_in >  b_in
-#
-# Written by James Bigler.
-MACRO(COMPARE_VERSION_STRINGS a_in b_in result_out)
-  # Since SEPARATE_ARGUMENTS using ' ' as the separation token,
-  # replace '.' with ' ' to allow easy tokenization of the string.
-  STRING(REPLACE "." " " a ${a_in})
-  STRING(REPLACE "." " " b ${b_in})
-  SEPARATE_ARGUMENTS(a)
-  SEPARATE_ARGUMENTS(b)
-
-  # Check the size of each list to see if they are equal.
-  LIST(LENGTH a a_length)
-  LIST(LENGTH b b_length)
-
-  # Pad the shorter list with zeros.
-
-  # Note that range needs to be one less than the length as the for
-  # loop is inclusive (silly CMake).
-  IF(a_length LESS b_length)
-    # a is shorter
-    SET(shorter a)
-    MATH(EXPR range "${b_length} - 1")
-    MATH(EXPR pad_range "${b_length} - ${a_length} - 1")
-  ELSE(a_length LESS b_length)
-    # b is shorter
-    SET(shorter b)
-    MATH(EXPR range "${a_length} - 1")
-    MATH(EXPR pad_range "${a_length} - ${b_length} - 1")
-  ENDIF(a_length LESS b_length)
-
-  # PAD out if we need to
-  IF(NOT pad_range LESS 0)
-    FOREACH(pad RANGE ${pad_range})
-      # Since shorter is an alias for b, we need to get to it by by dereferencing shorter.
-      LIST(APPEND ${shorter} 0)
-    ENDFOREACH(pad RANGE ${pad_range})
-  ENDIF(NOT pad_range LESS 0)
-
-  SET(result 0)
-  FOREACH(index RANGE ${range})
-    IF(result EQUAL 0)
-      # Only continue to compare things as long as they are equal
-      LIST(GET a ${index} a_version)
-      LIST(GET b ${index} b_version)
-      # LESS
-      IF(a_version LESS b_version)
-        SET(result -1)
-      ENDIF(a_version LESS b_version)
-      # GREATER
-      IF(a_version GREATER b_version)
-        SET(result 1)
-      ENDIF(a_version GREATER b_version)
-    ENDIF(result EQUAL 0)
-  ENDFOREACH(index)
-
-  # Copy out the return result
-  SET(${result_out} ${result})
-ENDMACRO(COMPARE_VERSION_STRINGS)
-
-####################################
-
-set(CMAKE_C_FLAGS "${CMAKE_C_FLAGS} -std=gnu99 -pedantic -Wall -Wextra -Wimplicit-fallthrough=0 -Wformat=2 -Wformat-nonliteral -Wformat-security -Wshadow -Wpointer-arith -Wmissing-prototypes -Wunused-const-variable=0 -Wcast-qual -Wsign-conversion -D_GNU_SOURCE -DNK_USE_CAPABILITY -Wno-discarded-qualifiers")
-set(CMAKE_CXX_FLAGS "${CMAKE_CXX_FLAGS} -std=gnu++17 -fno-rtti -pedantic -Wall -Wextra -Wimplicit-fallthrough=0 -Wformat-security -Wshadow -Wpointer-arith -Wmissing-prototypes -Wunused-const-variable=0 -Wcast-qual -Wsign-conversion -D_GNU_SOURCE -DNK_USE_CAPABILITY")
-
-set(CMAKE_BUILD_TYPE Release)
-
-if (WIN32)
-  set(OSNAME "Win32")
-else()
-execute_process(
-  COMMAND uname
-  COMMAND tr "\n" " "
-  COMMAND sed "s/ //"
-  OUTPUT_VARIABLE OSNAME
-  )
-endif()
-
-if (NOT (${OSNAME} STREQUAL "Linux"))
-  message("ndhc requires Linux.  Patches are welcome.  Consult README.")
-  return()
-endif()
-
-if (${OSNAME} STREQUAL "Linux")
-  execute_process(
-    COMMAND uname -r
-    COMMAND tr "\n" " "
-    COMMAND sed "s/ //"
-    OUTPUT_VARIABLE LINUX_VERSION
-    )
-  COMPARE_VERSION_STRINGS(${LINUX_VERSION} "3.5" LINUX_HAS_NO_NEW_PRIVS)
-  if (NOT ${LINUX_HAS_NO_NEW_PRIVS} LESS 0)
-    message("ncmlib: Enabling use of prctl SET_NO_NEW_PRIVS.")
-    set(CMAKE_C_FLAGS "${CMAKE_C_FLAGS} -DNK_USE_NO_NEW_PRIVS")
-    set(CMAKE_CXX_FLAGS "${CMAKE_CXX_FLAGS} -DNK_USE_NO_NEW_PRIVS")
-  else()
-    message("ncmlib: prctl SET_NO_NEW_PRIVS not available.")
-  endif()
-  COMPARE_VERSION_STRINGS(${LINUX_VERSION} "3.17" LINUX_HAS_GETRANDOM_SYSCALL)
-  if (NOT ${LINUX_HAS_GETRANDOM_SYSCALL} LESS 0)
-    message("ncmlib: Enabling use of getrandom syscall.")
-    set(CMAKE_C_FLAGS "${CMAKE_C_FLAGS} -DNK_USE_GETRANDOM_SYSCALL")
-    set(CMAKE_CXX_FLAGS "${CMAKE_CXX_FLAGS} -DNK_USE_GETRANDOM_SYSCALL")
-  else()
-    message("ncmlib: getrandom syscall not available.")
-  endif()
-endif()
-
-if (NOT CMAKE_CROSSCOMPILING)
-  set(GLIBC_DETECT_TEST_C
-    "
-    #include <stdio.h>
-    int main(int argc, char *argv[]) {
-    printf(\"%d.%d\", __GLIBC__, __GLIBC_MINOR__);
-    return 0;
-    }
-    ")
-  file(WRITE ${CMAKE_CURRENT_BINARY_DIR}/detect/glibc.c "${GLIBC_DETECT_TEST_C}\n")
-  try_run(GLIBC_DETECTION GLIBC_COMPILE
-    ${CMAKE_CURRENT_BINARY_DIR}/detect ${CMAKE_CURRENT_BINARY_DIR}/detect/glibc.c
-    RUN_OUTPUT_VARIABLE GLIBC_VERSION)
-  if (GLIBC_VERSION AND GLIBC_COMPILE)
-    message("glibc version detected as ${GLIBC_VERSION}")
-    COMPARE_VERSION_STRINGS(${GLIBC_VERSION} "2.17" GLIBC_MUST_LINK_RT)
-    if (${GLIBC_MUST_LINK_RT} LESS 0)
-      message("glibc <2.17 detected; linking against librt.")
-      set(CMAKE_C_FLAGS "${CMAKE_C_FLAGS} -lrt")
-      set(CMAKE_CXX_FLAGS "${CMAKE_CXX_FLAGS} -lrt")
-    endif()
-  else()
-    message("Could not detect glibc version.")
-  endif()
-endif()
-
-if ("$ENV{CROSSCOMPILE_MACHINENAME}" STREQUAL "")
-  execute_process(
-    COMMAND uname -m
-    COMMAND tr "\n" " "
-    COMMAND sed "s/ //"
-    OUTPUT_VARIABLE MACHINENAME
-    )
-else()
-  message("skipped machine detection; MACHINENAME is '$ENV{CROSSCOMPILE_MACHINENAME}'")
-  set(MACHINENAME $ENV{CROSSCOMPILE_MACHINENAME})
-endif()
-
-add_executable(ndhc "")
-
-find_program(RAGEL ragel)
-
-set(RAGEL_PRINT_COMMENT "Compiling Ragel state machine: FILE")
-file(GLOB_RECURSE RAGEL_FILES
-  "src/ifchd-parse.rl"
-  "src/cfg.rl"
-  )
-foreach(RAGEL_FILE ${RAGEL_FILES})
-  string(REGEX REPLACE "^[^/]*[/]" "" RAGEL_FILE_BASE ${RAGEL_FILE})
-  string(REGEX REPLACE ${RAGEL_FILE_BASE} "" RAGEL_FILE_PATH ${RAGEL_FILE})
-  string(REGEX REPLACE "[.]rl$" ".c" RAGEL_FILE_C ${RAGEL_FILE_BASE})
-  string(REGEX REPLACE "FILE$" ${RAGEL_FILE_BASE} RAGEL_COMMENT ${RAGEL_PRINT_COMMENT})
-  set(RAGEL_FILE_C_OUT ${CMAKE_CURRENT_BINARY_DIR}/${RAGEL_FILE_C})
-  list(APPEND RAGEL_C_FILES ${RAGEL_FILE_C_OUT})
-  add_custom_command(
-    OUTPUT ${RAGEL_FILE_C_OUT}
-    COMMAND ${RAGEL} -T0 ${RAGEL_ERRFMT_ARG} -o ${RAGEL_FILE_C_OUT} ${RAGEL_FILE_BASE}
-    MAIN_DEPENDENCY ${RAGEL_FILE}
-    WORKING_DIRECTORY ${RAGEL_FILE_PATH}
-    COMMENT ${RAGEL_COMMENT}
-    VERBATIM
-    )
-  if(CMAKE_COMPILER_IS_GNUCXX OR "${CMAKE_CXX_COMPILER_ID}" STREQUAL "Clang")
-    set_property(SOURCE ${RAGEL_FILE_C_OUT} APPEND_STRING PROPERTY COMPILE_FLAGS " -Wno-unused-const-variable")
-  endif()
-  target_sources(ndhc PRIVATE ${RAGEL_FILE_C_OUT})
-endforeach(RAGEL_FILE)
-add_custom_target(ndhc_ragel DEPENDS ${RAGEL_C_FILES})
-add_dependencies(ndhc ndhc_ragel)
-
-target_sources(ndhc PRIVATE
-  "src/lib/io.c"
-  "src/lib/hwrng.c"
-  "src/lib/random.c"
-  "src/lib/privs.c"
-  ${RAGEL_C_FILES}
-  "src/arp.c"
-  "src/ifchd.c"
-  "src/netlink.c"
-  "src/sockd.c"
-  "src/dhcp.c"
-  "src/ifset.c"
-  "src/nl.c"
-  "src/state.c"
-  "src/duiaid.c"
-  "src/leasefile.c"
-  "src/options.c"
-  "src/sys.c"
-  "src/ifchange.c"
-  "src/ndhc.c"
-  "src/rfkill.c"
-)
-target_include_directories(ndhc PRIVATE
-  "${PROJECT_SOURCE_DIR}/src"
-  )

Makefile

@@ -1,43 +1,28 @@
-# This is a pretty basic makefile.  I generally use CMake, so this is mostly
-# for distros that want to avoid build dependencies.  Produced exes will be
-# at './build/ndhc'.
-
-NCM_SRCS = $(sort $(wildcard src/lib/*.c))
-NDHC_SRCS = $(sort $(wildcard src/*.c))
-NCM_OBJS = $(NCM_SRCS:.c=.o)
+NDHC_SRCS = $(sort $(wildcard *.c) $(wildcard nk/*.c)) ifchd-parse.c cfg.c
 NDHC_OBJS = $(NDHC_SRCS:.c=.o)
-NDHC_INC = -I./src
-BUILD_DIR = build
-OBJ_DIR = $(BUILD_DIR)/objs
+INCL = -I.
 
-CC = gcc
-AR = ar
+CC ?= gcc
 CFLAGS = -O2 -s -std=gnu99 -pedantic -Wall -Wextra -Wimplicit-fallthrough=0 -Wformat=2 -Wformat-nonliteral -Wformat-security -Wshadow -Wpointer-arith -Wmissing-prototypes -Wunused-const-variable=0 -Wcast-qual -Wsign-conversion -D_GNU_SOURCE -DNK_USE_CAPABILITY -Wno-discarded-qualifiers
-# Not required for glibc >= 2.17.
-# The CMake build script will perform detection, but this Makefile is simple.
-#LINK_LIBS = -lrt
 
-all: makedir ifchd-parse.o cfg.o ndhc
+all: ragel ndhc
 
 clean:
-	rm -Rf $(BUILD_DIR)
+	rm -i *.o nk/*.o ndhc
 
-makedir:
-	mkdir -p $(BUILD_DIR) $(OBJ_DIR)/src $(OBJ_DIR)/src/lib
+ifchd-parse.c:
+	ragel -G2 -o ifchd-parse.c ifchd-parse.rl
 
-ifchd-parse.o:
-	ragel -G2 -o $(BUILD_DIR)/ifchd-parse.c src/ifchd-parse.rl
-	$(CC) $(CFLAGS) $(NDHC_INC) -c -o $(OBJ_DIR)/src/$@ $(BUILD_DIR)/ifchd-parse.c
+cfg.c:
+	ragel -G2 -o cfg.c cfg.rl
 
-cfg.o:
-	ragel -G2 -o $(BUILD_DIR)/cfg.c src/cfg.rl
-	$(CC) $(CFLAGS) $(NDHC_INC) -c -o $(OBJ_DIR)/src/$@ $(BUILD_DIR)/cfg.c
+ragel: ifchd-parse.c cfg.c
 
 %.o: %.c
-	$(CC) $(CFLAGS) $(NDHC_INC) -c -o $(OBJ_DIR)/$@ $<
+	$(CC) $(CFLAGS) $(INCL) -c -o $@ $^
 
-ndhc: $(NCM_OBJS) $(NDHC_OBJS) ifchd-parse.o cfg.o
-	$(CC) $(CFLAGS) -o $(BUILD_DIR)/$@ $(subst src/,$(OBJ_DIR)/src/,$(NDHC_OBJS)) $(subst src/lib/,$(OBJ_DIR)/src/lib/,$(NCM_OBJS)) $(BUILD_DIR)/objs/src/ifchd-parse.o $(BUILD_DIR)/objs/src/cfg.o $(LINK_LIBS)
+ndhc: $(NDHC_OBJS)
+	$(CC) $(CFLAGS) $(INCL) -o $@ $^
 
 .PHONY: all clean
 

README.md

@@ -1,5 +1,5 @@
 # ndhc
-Copyright 2004-2020 Nicholas J. Kain.
+Copyright 2004-2022 Nicholas J. Kain.
 
 See LICENSE for licensing information.  In short: Two-clause / New BSD.
 
@@ -86,16 +86,14 @@ new one.
 ## Requirements
 
 * Linux kernel
-* GNU Make or CMake
-* [Ragel 6](https://www.colm.net/open-source/ragel)
+* GNU Make
+* For developers: [Ragel](https://www.colm.net/open-source/ragel)
 
 ## Installation
 
 Compile and install ndhc.
-* Create a build directory: `mkdir build && cd build`
-* Create the makefiles: `cmake ..`
 * Build ndhc: `make`
-* Install the `ndhc/ndhc` executable in a normal place.  I would
+* Install the `ndhc` executable in a normal place.  I would
   suggest `/usr/sbin` or `/usr/local/sbin`.
 
 Time to create the jail in which ndhc will run. Become root and create new group `ndhc`.