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="${CFLAGS} -Wwrite-strings -Wno-unused-parameter"
41 LDFLAGS="-ltls -levent"
42 YACC=yacc
43 LEX=lex
44 STATIC=
45 
46 HAVE_ERR=
47 HAVE_EXPLICIT_BZERO=
48 HAVE_GETPROGNAME=
49 HAVE_LIBEVENT=
50 HAVE_LIBTLS=
51 HAVE_OPENSSL=
52 HAVE_PR_SET_NAME=
53 HAVE_RECALLOCARRAY=
54 HAVE_SETPROCTITLE=
55 HAVE_STRLCAT=
56 HAVE_STRLCPY=
57 HAVE_STRTONUM=
58 HAVE_VASPRINTF=
59 
60 NEED_GNU_SOURCE=0
61 NEED_OPENBSD_SOURCE=0
62 
63 PREFIX="/usr/local"
64 BINDIR=
65 
66 INSTALL="install"
67 
68 # try to auto detect CFLAGS and LDFLAGS
69 if which pkg-config 2>/dev/null 1>&2; then
70 	if pkg-config libtls; then
71 		CFLAGS="${CFLAGS} $(pkg-config --cflags libtls)"
72 		LDFLAGS="$(pkg-config --libs libtls)"
73 	fi
74 	if pkg-config openssl; then
75 		CFLAGS="${CFLAGS} $(pkg-config --cflags openssl)"
76 		LDFLAGS="${LDFLAGS} $(pkg-config --libs openssl)"
77 	fi
78 
79 	case "$(uname)" in
80 		OpenBSD) ;;
81 		*)
82 			if pkg-config libevent; then
83 				CFLAGS="${CFLAGS} $(pkg-config --cflags libevent)"
84 				LDFLAGS="${LDFLAGS} $(pkg-config --libs libevent)"
85 			fi
86 			;;
87 	esac
88 fi
89 
90 # auto detect lex/flex
91 which ${LEX} 2>/dev/null 1>&2 || {
92 	echo "${LEX} not found: trying flex" 1>&2
93 	echo "${LEX} not found: trying flex" 1>&3
94 	LEX=flex
95 	which ${LEX} 2>/dev/null 1>&2 || {
96 		echo "${LEX} not found: giving up" 1>&2
97 		echo "${LEX} not found: giving up" 1>&3
98 	}
99 }
100 
101 # auto detect yacc/bison
102 which ${YACC} 2>/dev/null 1>&2 || {
103 	echo "${YACC} not found: trying bison" 1>&2
104 	echo "${YACC} not found: trying bison" 1>&3
105 	YACC=bison
106 	which ${YACC} 2>/dev/null 1>&2 || {
107 		echo "${YACC} not found: giving up" 1>&2
108 		echo "${YACC} not found: giving up" 1>&3
109 	}
110 }
111 
112 # --------
113 # allow certain variables to be overridden on the command line
114 
115 for keyvals in "$@"; do
116 	key=`echo $keyvals | cut -s -d '=' -f1`
117 	if [ -z "$key" ]; then
118 		echo "$0: invalid key-value: $keyvals" 1>&2
119 		exit 1
120 	fi
121 	val=`echo $keyvals | cut -d '=' -f 2-`
122 	case "$key" in
123 		BINDIR)  BINDIR="$val" ;;
124 		CC)      CC="$val" ;;
125 		CFLAGS)  CFLAGS="$val" ;;
126 		DESTDIR) DESTDIR="$val" ;;
127 		LDFLAGS) LDFLAGS="$val" ;;
128 		LEX)     LEX="$lex" ;;
129 		PREFIX)  PREFIX="$val" ;;
130 		YACC)    YACC="$val" ;;
131 		*)
132 			echo "$0: invalid key: $key" 1>&2
133 			exit 1
134 	esac
135 done
136 
137 # --------
138 # tests functions
139 
140 # Check whether this HAVE_ setting is manually overridden.
141 # If yes, use the override, if no, do not decide anything yet.
142 # Arguments: test file name, test var name, manual value
143 ismanual() {
144 	[ -z "${3}" ] && return 1
145 	echo "tested ${1}: HAVE_${2}=${3} (manual)" 1>&2
146 	echo "tested ${1}: HAVE_${2}=${3} (manual)" 1>&3
147 	echo 1>&3
148 	return 0
149 }
150 
151 # Run a single autoconfiguration test.
152 # In case of success, enable the feature.
153 # In case of failure, do not decide anything yet.
154 # Arguments: test file name, test var name, additional CFLAGS
155 singletest() {
156 	n=${1}${3}
157 	cat 1>&3 << __HEREDOC__
158 testing ${n} ...
159 ${COMP} -o have/${1} have/${1}.c ${3} ${LDFLAGS}
160 __HEREDOC__
161 
162 	if ${COMP} -o "have/${1}" "have/${1}.c" ${3} ${LDFLAGS} 1>&3 2>&3
163 	then
164 		echo "partial result of ${n}: ${CC} succeeded" 1>&3
165 	else
166 		echo "tested ${n}: no (compilation failed)" 1>&2
167 		echo "result of ${n}: ${CC} failed with exit status $?" 1>&3
168 		echo "result of compiling ${n}: no" 1>&3
169 		echo 1>&3
170 		return 1
171 	fi
172 
173 	if ./have/${1} 1>&3 2>&3; then
174 		echo "tested ${n}: yes" 1>&2
175 		echo "result of running ${n}: yes" 1>&3
176 		echo 1>&3
177 		eval HAVE_${2}=1
178 		[ "${3}" = "-D_GNU_SOURCE" ] && NEED_GNU_SOURCE=1
179 		[ "${3}" = "-D_OPENBSD_SOURCE" ] && NEED_OPENBSD_SOURCE=1
180 		[ "${3}" = "-lsocket" ] && LD_RECVMSG="-lsocket"
181 		rm "have/${1}"
182 		return 0
183 	else
184 		echo "tested ${n}: no (execution failed)" 1>&2
185 		echo "result of ${n}: execution failed with exit status $?" 1>&3
186 		echo "result of running ${n}: no" 1>&3
187 		echo 1>&3
188 		rm "have/${1}"
189 		return 1
190 	fi
191 }
192 
193 # Run a complete autoconfiguration test, including the check for
194 # a manual override and disabling the feature on failure.
195 # Arguments: test file name, test var name, additional CFLAGS
196 # The final argument can optionally be repeated a second time.
197 runtest() {
198 	eval _manual=\${HAVE_${2}}
199 	ismanual "${1}" "${2}" "${_manual}" && return 0
200 	singletest "${1}" "${2}" "${3}" && return 0
201 	[ -n "${4}" ] && singletest "${1}" "${2}" "${4}" && return 0
202 	eval HAVE_${2}=0
203 	return 1
204 }
205 
206 # --------
207 # compiler options
208 
209 COMP="${CC} ${CFLAGS} -Wno-unused -Werror"
210 
211 echo "selected CFLAGS=\"${CFLAGS}\"" 1>&2
212 echo "selected CFLAGS=\"${CFLAGS}\"" 1>&3
213 echo 1>&3
214 
215 if [ -n "${STATIC}" ]; then
216 	echo "selected STATIC=\"${STATIC}\" (manual)" 1>&2
217 	echo "selected STATIC=\"${STATIC}\" (manual)" 1>&3
218 	echo 1>&3
219 else
220 	runtest noop STATIC -static || true
221 	[ ${HAVE_STATIC} -eq 0 ] || STATIC="-static"
222 	echo "selected STATIC=\"${STATIC}\"" 1>&2
223 	echo "selected STATIC=\"${STATIC}\"" 1>&3
224 	echo 1>&3
225 fi
226 
227 # --------
228 # tests for config.h
229 
230 runtest err		ERR		|| true
231 runtest explicit_bzero	EXPLICIT_BZERO	|| true
232 runtest getprogname	GETPROGNAME	|| true
233 runtest libevent	LIBEVENT	|| true
234 runtest libtls		LIBTLS		|| true
235 runtest openssl		OPENSSL		|| true
236 runtest pr_set_name	PR_SET_NAME	|| true
237 runtest recallocarray	RECALLOCARRAY	|| true
238 runtest setproctitle	SETPROCTITLE	|| true
239 runtest strlcat		STRLCAT		|| true
240 runtest strlcpy		STRLCPY		|| true
241 runtest strtonum	STRTONUM	|| true
242 runtest vasprintf	VASPRINTF	"" -D_GNU_SOURCE || true
243 
244 if [ ${HAVE_LIBTLS} -eq 0 ]; then
245 	echo "FATAL: libtls not found" 1>&2
246 	echo "FATAL: libtls not found" 1>&3
247 	exit 1
248 fi
249 
250 if [ ${HAVE_OPENSSL} -eq 0 ]; then
251 	echo "FATAL: openssl not found" 1>&2
252 	echo "FATAL: openssl not found" 1>&3
253 	exit 1
254 fi
255 
256 if [ ${HAVE_LIBEVENT} -eq 0 ]; then
257 	echo "FATAL: libevent not found" 1>&2
258 	echo "FATAL: libevent not found" 1>&3
259 	exit 1
260 fi
261 
262 # --------
263 # write config.h
264 
265 exec > config.h
266 
267 cat <<__HEREDOC__
268 #ifdef __cplusplus
269 #error "Do not use C++."
270 #endif
271 __HEREDOC__
272 
273 [ ${NEED_GNU_SOURCE} -eq 0 ] || echo "#define _GNU_SOURCE"
274 [ ${NEED_OPENBSD_SOURCE} -eq 0 ] || echo "#define _OPENBSD_SOURCE"
275 
276 [ ${HAVE_STRLCAT} -eq 0 -o ${HAVE_STRLCPY} -eq 0 ] \
277 	&& echo "#include <sys/types.h>"
278 [ ${HAVE_VASPRINTF} -eq 0 ] && echo "#include <stdarg.h>"
279 
280 cat <<__HEREDOC__
281 
282 #define HAVE_ERR		${HAVE_ERR}
283 #define HAVE_EXPLICIT_BZERO	${HAVE_EXPLICIT_BZERO}
284 #define HAVE_GETPROGNAME	${HAVE_GETPROGNAME}
285 #define HAVE_LIBEVENT		${HAVE_LIBEVENT}
286 #define HAVE_PR_SET_NAME	${HAVE_PR_SET_NAME}
287 #define HAVE_RECALLOCARRAY	${HAVE_RECALLOCARRAY}
288 #define HAVE_SETPROCTITLE	${SETPROCTITLE}
289 #define HAVE_STRLCAT		${HAVE_STRLCAT}
290 #define HAVE_STRLCPY		${HAVE_STRLCPY}
291 #define HAVE_STRTONUM		${HAVE_STRTONUM}
292 #define HAVE_VASPRINTF		${HAVE_VASPRINTF}
293 
294 __HEREDOC__
295 
296 [ ${HAVE_VASPRINTF} -eq 0 ] && echo "#include <stdarg.h>"
297 
298 [ ${HAVE_EXPLICIT_BZERO} -eq 0 -o \
299   ${HAVE_RECALLOCARRAY} -eq 0 -o \
300   ${HAVE_STRLCAT} -eq 0 -o \
301   ${HAVE_STRLCPY} -eq 0 -o \
302   ${HAVE_STRTONUM} -eq 0 ] && echo "#include <stddef.h>"
303 
304 if [ ${HAVE_ERR} -eq 0 ]; then
305 	echo "extern	void	 err(int, const char*, ...);"
306 	echo "extern	void	 errx(int, const char*, ...);"
307 	echo "extern	void	 warn(const char*, ...);"
308 	echo "extern	void	 warnx(const char*, ...);"
309 	COMPAT="${COMPAT} compat/err.o"
310 else
311 	echo "#include <err.h>"
312 fi
313 if [ ${HAVE_EXPLICIT_BZERO} -eq 0 ]; then
314 	echo "extern	void	 explicit_bzero(void*, size_t);"
315 	COMPAT="${COMPAT} compat/explicit_bzero.o"
316 fi
317 if [ ${HAVE_GETPROGNAME} -eq 0 ]; then
318 	echo "extern	const char *getprogname(void);"
319 	COMPAT="${COMPAT} compat/getprogname.o"
320 fi
321 if [ ${HAVE_RECALLOCARRAY} -eq 0 ]; then
322 	echo "extern	void*	 recallocarray(void*, size_t, size_t, size_t);"
323 	COMPAT="${COMPAT} compat/recallocarray.o"
324 fi
325 if [ ${HAVE_SETPROCTITLE} -eq 0 ]; then
326 	echo "extern	void	 setproctitle(const char *fmt, ...);"
327 	COMPAT="${COMPAT} compat/setproctitle.o"
328 fi
329 if [ ${HAVE_STRLCAT} -eq 0 ]; then
330 	echo "extern	size_t	 strlcat(char*, const char*, size_t);"
331 	COMPAT="${COMPAT} compat/strlcat.o"
332 fi
333 if [ ${HAVE_STRLCPY} -eq 0 ]; then
334 	echo "extern	size_t	 strlcpy(char*, const char*, size_t);"
335 	COMPAT="${COMPAT} compat/strlcpy.o"
336 fi
337 if [ ${HAVE_STRTONUM} -eq 0 ]; then
338 	echo "extern	long long strtonum(const char*, long long, long long, const char**);"
339 	COMPAT="${COMPAT} compat/strtonum.o"
340 fi
341 if [ ${HAVE_VASPRINTF} -eq 0 ]; then
342 	echo "extern	int	 vasprintf(char**, const char*, va_list);"
343 	COMPAT="${COMPAT} compat/vasprintf.o"
344 fi
345 echo "file config.h: written" 1>&2
346 echo "file config.h: written" 1>&3
347 
348 # --------
349 # tests for Makefile.local
350 
351 exec > Makefile.local
352 
353 [ -z "${BINDIR}"          ] && BINDIR="${PREFIX}/bin"
354 [ -z "${MANDIR}"          ] && MANDIR="${PREFIX}/man"
355 
356 [ -z "${INSTALL_PROGRAM}" ] && INSTALL_PROGRAM="${INSTALL} -m 0555"
357 [ -z "${INSTALL_LIB}"     ] && INSTALL_LIB="${INSTALL} -m 0444"
358 [ -z "${INSTALL_MAN}"     ] && INSTALL_MAN="${INSTALL} -m 0444"
359 [ -z "${INSTALL_DATA}"    ] && INSTALL_DATA="${INSTALL} -m 0444"
360 
361 cat << __HEREDOC__
362 CC		= ${CC}
363 CFLAGS		= ${CFLAGS}
364 LDFLAGS		= ${LDFLAGS}
365 YACC		= ${YACC}
366 LEX		= ${LEX}
367 COMPAT		= ${COMPAT}
368 STATIC		= ${STATIC}
369 PREFIX		= ${PREFIX}
370 BINDIR		= ${BINDIR}
371 MANDIR		= ${MANDIR}
372 INCLUDEDIR	= ${INCLUDEDIR}
373 INSTALL		= ${INSTALL}
374 INSTALL_PROGRAM	= ${INSTALL_PROGRAM}
375 INSTALL_LIB	= ${INSTALL_LIB}
376 INSTALL_MAN	= ${INSTALL_MAN}
377 INSTALL_DATA	= ${INSTALL_DATA}
378 __HEREDOC__
379 
380 echo "file Makefile.local: written" 1>&2
381 echo "file Makefile.local: written" 1>&3
382 
383 exit 0