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 		exit 1
86 	}
87 }
88 
89 # auto detect yacc/bison
90 which ${YACC} 2>/dev/null 1>&2 || {
91 	echo "${YACC} not found: trying bison" 1>&2
92 	echo "${YACC} not found: trying bison" 1>&3
93 	YACC=bison
94 	which ${YACC} 2>/dev/null 1>&2 || {
95 		echo "${YACC} not found: giving up" 1>&2
96 		echo "${YACC} not found: giving up" 1>&3
97 		exit 1
98 	}
99 }
100 
101 # --------
102 # allow certain variables to be overridden on the command line
103 
104 for keyvals in "$@"; do
105 	key=`echo $keyvals | cut -s -d '=' -f1`
106 	if [ -z "$key" ]; then
107 		echo "$0: invalid key-value: $keyvals" 1>&2
108 		exit 1
109 	fi
110 	val=`echo $keyvals | cut -d '=' -f 2-`
111 	case "$key" in
112 		BINDIR)  BINDIR="$val" ;;
113 		CC)      CC="$val" ;;
114 		CFLAGS)  CFLAGS="$val" ;;
115 		DESTDIR) DESTDIR="$val" ;;
116 		LDFLAGS) LDFLAGS="$val" ;;
117 		LEX)     LEX="$lex" ;;
118 		PREFIX)  PREFIX="$val" ;;
119 		YACC)    YACC="$val" ;;
120 		*)
121 			echo "$0: invalid key: $key" 1>&2
122 			exit 1
123 	esac
124 done
125 
126 # --------
127 # tests functions
128 
129 # Check whether this HAVE_ setting is manually overridden.
130 # If yes, use the override, if no, do not decide anything yet.
131 # Arguments: test file name, test var name, manual value
132 ismanual() {
133 	[ -z "${3}" ] && return 1
134 	echo "tested ${1}: HAVE_${2}=${3} (manual)" 1>&2
135 	echo "tested ${1}: HAVE_${2}=${3} (manual)" 1>&3
136 	echo 1>&3
137 	return 0
138 }
139 
140 # Run a single autoconfiguration test.
141 # In case of success, enable the feature.
142 # In case of failure, do not decide anything yet.
143 # Arguments: test file name, test var name, additional CFLAGS
144 singletest() {
145 	n=${1}${3}
146 	cat 1>&3 << __HEREDOC__
147 testing ${n} ...
148 ${COMP} -o have/${1} have/${1}.c ${3} ${LDFLAGS}
149 __HEREDOC__
150 
151 	if ${COMP} -o "have/${1}" "have/${1}.c" ${3} ${LDFLAGS} 1>&3 2>&3
152 	then
153 		echo "partial result of ${n}: ${CC} succeeded" 1>&3
154 	else
155 		echo "tested ${n}: no (compilation failed)" 1>&2
156 		echo "result of ${n}: ${CC} failed with exit status $?" 1>&3
157 		echo "result of compiling ${n}: no" 1>&3
158 		echo 1>&3
159 		return 1
160 	fi
161 
162 	if ./have/${1} 1>&3 2>&3; then
163 		echo "tested ${n}: yes" 1>&2
164 		echo "result of running ${n}: yes" 1>&3
165 		echo 1>&3
166 		eval HAVE_${2}=1
167 		[ "${3}" = "-D_GNU_SOURCE" ] && NEED_GNU_SOURCE=1
168 		[ "${3}" = "-D_OPENBSD_SOURCE" ] && NEED_OPENBSD_SOURCE=1
169 		[ "${3}" = "-lsocket" ] && LD_RECVMSG="-lsocket"
170 		rm "have/${1}"
171 		return 0
172 	else
173 		echo "tested ${n}: no (execution failed)" 1>&2
174 		echo "result of ${n}: execution failed with exit status $?" 1>&3
175 		echo "result of running ${n}: no" 1>&3
176 		echo 1>&3
177 		rm "have/${1}"
178 		return 1
179 	fi
180 }
181 
182 # Run a complete autoconfiguration test, including the check for
183 # a manual override and disabling the feature on failure.
184 # Arguments: test file name, test var name, additional CFLAGS
185 # The final argument can optionally be repeated a second time.
186 runtest() {
187 	eval _manual=\${HAVE_${2}}
188 	ismanual "${1}" "${2}" "${_manual}" && return 0
189 	singletest "${1}" "${2}" "${3}" && return 0
190 	[ -n "${4}" ] && singletest "${1}" "${2}" "${4}" && return 0
191 	eval HAVE_${2}=0
192 	return 1
193 }
194 
195 # --------
196 # compiler options
197 
198 COMP="${CC} ${CFLAGS} -Wno-unused -Werror"
199 
200 echo "selected CFLAGS=\"${CFLAGS}\"" 1>&2
201 echo "selected CFLAGS=\"${CFLAGS}\"" 1>&3
202 echo 1>&3
203 
204 if [ -n "${STATIC}" ]; then
205 	echo "selected STATIC=\"${STATIC}\" (manual)" 1>&2
206 	echo "selected STATIC=\"${STATIC}\" (manual)" 1>&3
207 	echo 1>&3
208 else
209 	runtest noop STATIC -static || true
210 	[ ${HAVE_STATIC} -eq 0 ] || STATIC="-static"
211 	echo "selected STATIC=\"${STATIC}\"" 1>&2
212 	echo "selected STATIC=\"${STATIC}\"" 1>&3
213 	echo 1>&3
214 fi
215 
216 # --------
217 # tests for config.h
218 
219 runtest err		ERR		|| true
220 runtest explicit_bzero	EXPLICIT_BZERO	|| true
221 runtest getprogname	GETPROGNAME	|| true
222 runtest libtls		LIBTLS		|| true
223 runtest openssl		OPENSSL		|| true
224 runtest recallocarray	RECALLOCARRAY	|| true
225 runtest strlcat		STRLCAT		|| true
226 runtest strlcpy		STRLCPY		|| true
227 runtest strtonum	STRTONUM	|| true
228 runtest vasprintf	VASPRINTF	"" -D_GNU_SOURCE || true
229 
230 if [ ${HAVE_LIBTLS} -eq 0 ]; then
231 	echo "FATAL: libtls not found" 1>&2
232 	echo "FATAL: libtls not found" 1>&3
233 	exit 1
234 fi
235 
236 if [ ${HAVE_OPENSSL} -eq 0 ]; then
237 	echo "FATAL: openssl not found" 1>&2
238 	echo "FATAL: openssl not found" 1>&3
239 	exit 1
240 fi
241 
242 # --------
243 # write config.h
244 
245 exec > config.h
246 
247 cat <<__HEREDOC__
248 #ifdef __cplusplus
249 #error "Do not use C++."
250 #endif
251 __HEREDOC__
252 
253 [ ${NEED_GNU_SOURCE} -eq 0 ] || echo "#define _GNU_SOURCE"
254 [ ${NEED_OPENBSD_SOURCE} -eq 0 ] || echo "#define _OPENBSD_SOURCE"
255 
256 [ ${HAVE_STRLCAT} -eq 0 -o ${HAVE_STRLCPY} -eq 0 ] \
257 	&& echo "#include <sys/types.h>"
258 [ ${HAVE_VASPRINTF} -eq 0 ] && echo "#include <stdarg.h>"
259 
260 cat <<__HEREDOC__
261 
262 #define HAVE_ERR		${HAVE_ERR}
263 #define HAVE_EXPLICIT_BZERO	${HAVE_EXPLICIT_BZERO}
264 #define HAVE_GETPROGNAME	${HAVE_GETPROGNAME}
265 #define HAVE_RECALLOCARRAY	${HAVE_RECALLOCARRAY}
266 #define HAVE_STRLCAT		${HAVE_STRLCAT}
267 #define HAVE_STRLCPY		${HAVE_STRLCPY}
268 #define HAVE_STRTONUM		${HAVE_STRTONUM}
269 #define HAVE_VASPRINTF		${HAVE_VASPRINTF}
270 
271 __HEREDOC__
272 
273 [ ${HAVE_VASPRINTF} -eq 0 ] && echo "#include <stdarg.h>"
274 
275 [ ${HAVE_EXPLICIT_BZERO} -eq 0 -o \
276   ${HAVE_RECALLOCARRAY} -eq 0 -o \
277   ${HAVE_STRLCAT} -eq 0 -o \
278   ${HAVE_STRLCPY} -eq 0 -o \
279   ${HAVE_STRTONUM} -eq 0 ] && echo "#include <stddef.h>"
280 
281 if [ ${HAVE_ERR} -eq 0 ]; then
282 	echo "extern	void	 err(int, const char*, ...);"
283 	echo "extern	void	 errx(int, const char*, ...);"
284 	echo "extern	void	 warn(const char*, ...);"
285 	echo "extern	void	 warnx(const char*, ...);"
286 	COMPAT="${COMPAT} compat/err.o"
287 else
288 	echo "#include <err.h>"
289 fi
290 if [ ${HAVE_EXPLICIT_BZERO} -eq 0 ]; then
291 	echo "extern	void	 explicit_bzero(void*, size_t);"
292 	COMPAT="${COMPAT} compat/explicit_bzero.o"
293 fi
294 if [ ${HAVE_GETPROGNAME} -eq 0 ]; then
295 	echo "extern	const char *getprogname(void);"
296 	COMPAT="${COMPAT} compat/getprogname.o"
297 fi
298 if [ ${HAVE_RECALLOCARRAY} -eq 0 ]; then
299 	echo "extern	void*	 recallocarray(void*, size_t, size_t, size_t);"
300 	COMPAT="${COMPAT} compat/recallocarray.o"
301 fi
302 if [ ${HAVE_STRLCAT} -eq 0 ]; then
303 	echo "extern	size_t	 strlcat(char*, const char*, size_t);"
304 	COMPAT="${COMPAT} compat/strlcat.o"
305 fi
306 if [ ${HAVE_STRLCPY} -eq 0 ]; then
307 	echo "extern	size_t	 strlcpy(char*, const char*, size_t);"
308 	COMPAT="${COMPAT} compat/strlcpy.o"
309 fi
310 if [ ${HAVE_STRTONUM} -eq 0 ]; then
311 	echo "extern	long long strtonum(const char*, long long, long long, const char**);"
312 	COMPAT="${COMPAT} compat/strtonum.o"
313 fi
314 if [ ${HAVE_VASPRINTF} -eq 0 ]; then
315 	echo "extern	int	 vasprintf(char**, const char*, va_list);"
316 	COMPAT="${COMPAT} compat/vasprintf.o"
317 fi
318 echo "file config.h: written" 1>&2
319 echo "file config.h: written" 1>&3
320 
321 # --------
322 # tests for Makefile.local
323 
324 exec > Makefile.local
325 
326 [ -z "${BINDIR}"          ] && BINDIR="${PREFIX}/bin"
327 [ -z "${MANDIR}"          ] && MANDIR="${PREFIX}/man"
328 
329 [ -z "${INSTALL_PROGRAM}" ] && INSTALL_PROGRAM="${INSTALL} -m 0555"
330 [ -z "${INSTALL_LIB}"     ] && INSTALL_LIB="${INSTALL} -m 0444"
331 [ -z "${INSTALL_MAN}"     ] && INSTALL_MAN="${INSTALL} -m 0444"
332 [ -z "${INSTALL_DATA}"    ] && INSTALL_DATA="${INSTALL} -m 0444"
333 
334 cat << __HEREDOC__
335 CC		= ${CC}
336 CFLAGS		= ${CFLAGS}
337 LDFLAGS		= ${LDFLAGS}
338 YACC		= ${YACC}
339 LEX		= ${LEX}
340 COMPAT		= ${COMPAT}
341 STATIC		= ${STATIC}
342 PREFIX		= ${PREFIX}
343 BINDIR		= ${BINDIR}
344 INCLUDEDIR	= ${INCLUDEDIR}
345 INSTALL		= ${INSTALL}
346 INSTALL_PROGRAM	= ${INSTALL_PROGRAM}
347 INSTALL_LIB	= ${INSTALL_LIB}
348 INSTALL_MAN	= ${INSTALL_MAN}
349 INSTALL_DATA	= ${INSTALL_DATA}
350 __HEREDOC__
351 
352 echo "file Makefile.local: written" 1>&2
353 echo "file Makefile.local: written" 1>&3
354 
355 exit 0