1 #!/bin/sh
2 #
3 # Copyright (c) 2021 Omar Polo <op@omarpolo.com>
4 #
5 # Permission to use, copy, modify, and distribute this software for any
6 # purpose with or without fee is hereby granted, provided that the above
7 # copyright notice and this permission notice appear in all copies.
8 #
9 # THE SOFTWARE IS PROVIDED "AS IS" AND THE AUTHOR DISCLAIMS ALL WARRANTIES
10 # WITH REGARD TO THIS SOFTWARE INCLUDING ALL IMPLIED WARRANTIES OF
11 # MERCHANTABILITY AND FITNESS. IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR
12 # ANY SPECIAL, DIRECT, INDIRECT, OR CONSEQUENTIAL DAMAGES OR ANY DAMAGES
13 # WHATSOEVER RESULTING FROM LOSS OF USE, DATA OR PROFITS, WHETHER IN AN
14 # ACTION OF CONTRACT, NEGLIGENCE OR OTHER TORTIOUS ACTION, ARISING OUT OF
15 # OR IN CONNECTION WITH THE USE OR PERFORMANCE OF THIS SOFTWARE.
16 
17 # adapted from mandoc configure and oconfigure, thanks schwarze@ and
18 # kristaps@!
19 
20 set -e
21 
22 [ -w config.log ] && mv config.log config.log.old
23 [ -w config.h   ] && mv config.h   config.h.old
24 
25 # Output file descriptor usage:
26 # 1 (stdout): config.h, Makefile.local
27 # 2 (stderr): original stderr, usually to the console
28 # 3: config.log
29 
30 exec 3> config.log
31 echo "file config.log: writing..."
32 
33 # --------
34 # default settings: initialize all vars here such that nothing is
35 # leaked from the environment except for CC and CFLAGS
36 
37 CC=`printf "all:\\n\\t@echo \\\$(CC)\\n" | make ${MAKE_FLAGS} -sf -`
38 CFLAGS=`printf "all:\\n\\t@echo \\\$(CFLAGS)\\n" | make ${MAKE_FLAGS} -sf -`
39 CFLAGS="${CFLAGS} -g -W -Wall -Wextra -Wmissing-prototypes -Wstrict-prototypes"
40 CFLAGS="${CFLAGS} -Wwrite-strings -Wno-unused-parameter"
41 LDFLAGS=-ltls
42 YACC=yacc
43 LEX=lex
44 STATIC=
45 
46 HAVE_ERR=
47 HAVE_EXPLICIT_BZERO=
48 HAVE_GETPROGNAME=
49 HAVE_LIBTLS=
50 HAVE_OPENSSL=
51 HAVE_RECALLOCARRAY=
52 HAVE_STRLCAT=
53 HAVE_STRLCPY=
54 HAVE_STRTONUM=
55 HAVE_VASPRINTF=
56 
57 NEED_GNU_SOURCE=0
58 NEED_OPENBSD_SOURCE=0
59 
60 PREFIX="/usr/local"
61 BINDIR=
62 
63 INSTALL="install"
64 
65 # try to auto detect CFLAGS and LDFLAGS
66 if which pkg-config 2>/dev/null 1>&2; then
67 	if pkg-config libtls; then
68 		CFLAGS="$(pkg-config --cflags libtls)"
69 		LDFLAGS="$(pkg-config --libs libtls)"
70 	fi
71 	if pkg-config openssl; then
72 		CFLAGS="${CFLAGS} $(pkg-config --cflags openssl)"
73 		LDFLAGS="${LDFLAGS} $(pkg-config --libs openssl)"
74 	fi
75 fi
76 
77 # auto detect lex/flex
78 which ${LEX} 2>/dev/null 1>&2 || {
79 	echo "${LEX} not found: trying flex" 1>&2
80 	echo "${LEX} not found: trying flex" 1>&3
81 	LEX=flex
82 	which ${LEX} 2>/dev/null 1>&2 || {
83 		echo "${LEX} not found: giving up" 1>&2
84 		echo "${LEX} not found: giving up" 1>&3
85 	}
86 }
87 
88 # auto detect yacc/bison
89 which ${YACC} 2>/dev/null 1>&2 || {
90 	echo "${YACC} not found: trying bison" 1>&2
91 	echo "${YACC} not found: trying bison" 1>&3
92 	YACC=bison
93 	which ${YACC} 2>/dev/null 1>&2 || {
94 		echo "${YACC} not found: giving up" 1>&2
95 		echo "${YACC} not found: giving up" 1>&3
96 	}
97 }
98 
99 # --------
100 # allow certain variables to be overridden on the command line
101 
102 for keyvals in "$@"; do
103 	key=`echo $keyvals | cut -s -d '=' -f1`
104 	if [ -z "$key" ]; then
105 		echo "$0: invalid key-value: $keyvals" 1>&2
106 		exit 1
107 	fi
108 	val=`echo $keyvals | cut -d '=' -f 2-`
109 	case "$key" in
110 		BINDIR)  BINDIR="$val" ;;
111 		CC)      CC="$val" ;;
112 		CFLAGS)  CFLAGS="$val" ;;
113 		DESTDIR) DESTDIR="$val" ;;
114 		LDFLAGS) LDFLAGS="$val" ;;
115 		LEX)     LEX="$lex" ;;
116 		PREFIX)  PREFIX="$val" ;;
117 		YACC)    YACC="$val" ;;
118 		*)
119 			echo "$0: invalid key: $key" 1>&2
120 			exit 1
121 	esac
122 done
123 
124 # --------
125 # tests functions
126 
127 # Check whether this HAVE_ setting is manually overridden.
128 # If yes, use the override, if no, do not decide anything yet.
129 # Arguments: test file name, test var name, manual value
130 ismanual() {
131 	[ -z "${3}" ] && return 1
132 	echo "tested ${1}: HAVE_${2}=${3} (manual)" 1>&2
133 	echo "tested ${1}: HAVE_${2}=${3} (manual)" 1>&3
134 	echo 1>&3
135 	return 0
136 }
137 
138 # Run a single autoconfiguration test.
139 # In case of success, enable the feature.
140 # In case of failure, do not decide anything yet.
141 # Arguments: test file name, test var name, additional CFLAGS
142 singletest() {
143 	n=${1}${3}
144 	cat 1>&3 << __HEREDOC__
145 testing ${n} ...
146 ${COMP} -o have/${1} have/${1}.c ${3} ${LDFLAGS}
147 __HEREDOC__
148 
149 	if ${COMP} -o "have/${1}" "have/${1}.c" ${3} ${LDFLAGS} 1>&3 2>&3
150 	then
151 		echo "partial result of ${n}: ${CC} succeeded" 1>&3
152 	else
153 		echo "tested ${n}: no (compilation failed)" 1>&2
154 		echo "result of ${n}: ${CC} failed with exit status $?" 1>&3
155 		echo "result of compiling ${n}: no" 1>&3
156 		echo 1>&3
157 		return 1
158 	fi
159 
160 	if ./have/${1} 1>&3 2>&3; then
161 		echo "tested ${n}: yes" 1>&2
162 		echo "result of running ${n}: yes" 1>&3
163 		echo 1>&3
164 		eval HAVE_${2}=1
165 		[ "${3}" = "-D_GNU_SOURCE" ] && NEED_GNU_SOURCE=1
166 		[ "${3}" = "-D_OPENBSD_SOURCE" ] && NEED_OPENBSD_SOURCE=1
167 		[ "${3}" = "-lsocket" ] && LD_RECVMSG="-lsocket"
168 		rm "have/${1}"
169 		return 0
170 	else
171 		echo "tested ${n}: no (execution failed)" 1>&2
172 		echo "result of ${n}: execution failed with exit status $?" 1>&3
173 		echo "result of running ${n}: no" 1>&3
174 		echo 1>&3
175 		rm "have/${1}"
176 		return 1
177 	fi
178 }
179 
180 # Run a complete autoconfiguration test, including the check for
181 # a manual override and disabling the feature on failure.
182 # Arguments: test file name, test var name, additional CFLAGS
183 # The final argument can optionally be repeated a second time.
184 runtest() {
185 	eval _manual=\${HAVE_${2}}
186 	ismanual "${1}" "${2}" "${_manual}" && return 0
187 	singletest "${1}" "${2}" "${3}" && return 0
188 	[ -n "${4}" ] && singletest "${1}" "${2}" "${4}" && return 0
189 	eval HAVE_${2}=0
190 	return 1
191 }
192 
193 # --------
194 # compiler options
195 
196 COMP="${CC} ${CFLAGS} -Wno-unused -Werror"
197 
198 echo "selected CFLAGS=\"${CFLAGS}\"" 1>&2
199 echo "selected CFLAGS=\"${CFLAGS}\"" 1>&3
200 echo 1>&3
201 
202 if [ -n "${STATIC}" ]; then
203 	echo "selected STATIC=\"${STATIC}\" (manual)" 1>&2
204 	echo "selected STATIC=\"${STATIC}\" (manual)" 1>&3
205 	echo 1>&3
206 else
207 	runtest noop STATIC -static || true
208 	[ ${HAVE_STATIC} -eq 0 ] || STATIC="-static"
209 	echo "selected STATIC=\"${STATIC}\"" 1>&2
210 	echo "selected STATIC=\"${STATIC}\"" 1>&3
211 	echo 1>&3
212 fi
213 
214 # --------
215 # tests for config.h
216 
217 runtest err		ERR		|| true
218 runtest explicit_bzero	EXPLICIT_BZERO	|| true
219 runtest getprogname	GETPROGNAME	|| true
220 runtest libtls		LIBTLS		|| true
221 runtest openssl		OPENSSL		|| true
222 runtest recallocarray	RECALLOCARRAY	|| true
223 runtest strlcat		STRLCAT		|| true
224 runtest strlcpy		STRLCPY		|| true
225 runtest strtonum	STRTONUM	|| true
226 runtest vasprintf	VASPRINTF	"" -D_GNU_SOURCE || true
227 
228 if [ ${HAVE_LIBTLS} -eq 0 ]; then
229 	echo "FATAL: libtls not found" 1>&2
230 	echo "FATAL: libtls not found" 1>&3
231 	exit 1
232 fi
233 
234 if [ ${HAVE_OPENSSL} -eq 0 ]; then
235 	echo "FATAL: openssl not found" 1>&2
236 	echo "FATAL: openssl not found" 1>&3
237 	exit 1
238 fi
239 
240 # --------
241 # write config.h
242 
243 exec > config.h
244 
245 cat <<__HEREDOC__
246 #ifdef __cplusplus
247 #error "Do not use C++."
248 #endif
249 __HEREDOC__
250 
251 [ ${NEED_GNU_SOURCE} -eq 0 ] || echo "#define _GNU_SOURCE"
252 [ ${NEED_OPENBSD_SOURCE} -eq 0 ] || echo "#define _OPENBSD_SOURCE"
253 
254 [ ${HAVE_STRLCAT} -eq 0 -o ${HAVE_STRLCPY} -eq 0 ] \
255 	&& echo "#include <sys/types.h>"
256 [ ${HAVE_VASPRINTF} -eq 0 ] && echo "#include <stdarg.h>"
257 
258 cat <<__HEREDOC__
259 
260 #define HAVE_ERR		${HAVE_ERR}
261 #define HAVE_EXPLICIT_BZERO	${HAVE_EXPLICIT_BZERO}
262 #define HAVE_GETPROGNAME	${HAVE_GETPROGNAME}
263 #define HAVE_RECALLOCARRAY	${HAVE_RECALLOCARRAY}
264 #define HAVE_STRLCAT		${HAVE_STRLCAT}
265 #define HAVE_STRLCPY		${HAVE_STRLCPY}
266 #define HAVE_STRTONUM		${HAVE_STRTONUM}
267 #define HAVE_VASPRINTF		${HAVE_VASPRINTF}
268 
269 __HEREDOC__
270 
271 [ ${HAVE_VASPRINTF} -eq 0 ] && echo "#include <stdarg.h>"
272 
273 [ ${HAVE_EXPLICIT_BZERO} -eq 0 -o \
274   ${HAVE_RECALLOCARRAY} -eq 0 -o \
275   ${HAVE_STRLCAT} -eq 0 -o \
276   ${HAVE_STRLCPY} -eq 0 -o \
277   ${HAVE_STRTONUM} -eq 0 ] && echo "#include <stddef.h>"
278 
279 if [ ${HAVE_ERR} -eq 0 ]; then
280 	echo "extern	void	 err(int, const char*, ...);"
281 	echo "extern	void	 errx(int, const char*, ...);"
282 	echo "extern	void	 warn(const char*, ...);"
283 	echo "extern	void	 warnx(const char*, ...);"
284 	COMPAT="${COMPAT} compat/err.o"
285 else
286 	echo "#include <err.h>"
287 fi
288 if [ ${HAVE_EXPLICIT_BZERO} -eq 0 ]; then
289 	echo "extern	void	 explicit_bzero(void*, size_t);"
290 	COMPAT="${COMPAT} compat/explicit_bzero.o"
291 fi
292 if [ ${HAVE_GETPROGNAME} -eq 0 ]; then
293 	echo "extern	const char *getprogname(void);"
294 	COMPAT="${COMPAT} compat/getprogname.o"
295 fi
296 if [ ${HAVE_RECALLOCARRAY} -eq 0 ]; then
297 	echo "extern	void*	 recallocarray(void*, size_t, size_t, size_t);"
298 	COMPAT="${COMPAT} compat/recallocarray.o"
299 fi
300 if [ ${HAVE_STRLCAT} -eq 0 ]; then
301 	echo "extern	size_t	 strlcat(char*, const char*, size_t);"
302 	COMPAT="${COMPAT} compat/strlcat.o"
303 fi
304 if [ ${HAVE_STRLCPY} -eq 0 ]; then
305 	echo "extern	size_t	 strlcpy(char*, const char*, size_t);"
306 	COMPAT="${COMPAT} compat/strlcpy.o"
307 fi
308 if [ ${HAVE_STRTONUM} -eq 0 ]; then
309 	echo "extern	long long strtonum(const char*, long long, long long, const char**);"
310 	COMPAT="${COMPAT} compat/strtonum.o"
311 fi
312 if [ ${HAVE_VASPRINTF} -eq 0 ]; then
313 	echo "extern	int	 vasprintf(char**, const char*, va_list);"
314 	COMPAT="${COMPAT} compat/vasprintf.o"
315 fi
316 echo "file config.h: written" 1>&2
317 echo "file config.h: written" 1>&3
318 
319 # --------
320 # tests for Makefile.local
321 
322 exec > Makefile.local
323 
324 [ -z "${BINDIR}"          ] && BINDIR="${PREFIX}/bin"
325 [ -z "${MANDIR}"          ] && MANDIR="${PREFIX}/man"
326 
327 [ -z "${INSTALL_PROGRAM}" ] && INSTALL_PROGRAM="${INSTALL} -m 0555"
328 [ -z "${INSTALL_LIB}"     ] && INSTALL_LIB="${INSTALL} -m 0444"
329 [ -z "${INSTALL_MAN}"     ] && INSTALL_MAN="${INSTALL} -m 0444"
330 [ -z "${INSTALL_DATA}"    ] && INSTALL_DATA="${INSTALL} -m 0444"
331 
332 cat << __HEREDOC__
333 CC		= ${CC}
334 CFLAGS		= ${CFLAGS}
335 LDFLAGS		= ${LDFLAGS}
336 YACC		= ${YACC}
337 LEX		= ${LEX}
338 COMPAT		= ${COMPAT}
339 STATIC		= ${STATIC}
340 PREFIX		= ${PREFIX}
341 BINDIR		= ${BINDIR}
342 INCLUDEDIR	= ${INCLUDEDIR}
343 INSTALL		= ${INSTALL}
344 INSTALL_PROGRAM	= ${INSTALL_PROGRAM}
345 INSTALL_LIB	= ${INSTALL_LIB}
346 INSTALL_MAN	= ${INSTALL_MAN}
347 INSTALL_DATA	= ${INSTALL_DATA}
348 __HEREDOC__
349 
350 echo "file Makefile.local: written" 1>&2
351 echo "file Makefile.local: written" 1>&3
352 
353 exit 0