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="${CFLAGS} -Wwrite-strings -Wno-unused-parameter"
41 LDFLAGS="-ltls -levent"
42 YACC=yacc
43 LEX=lex
44 STATIC=
45 
46 HAVE_ERR=
47 HAVE_EXPLICIT_BZERO=
48 HAVE_GETPROGNAME=
49 HAVE_LIBEVENT=
50 HAVE_LIBTLS=
51 HAVE_OPENSSL=
52 HAVE_PROGRAM_INVOCATION_SHORT_NAME=
53 HAVE_PR_SET_NAME=
54 HAVE_RECALLOCARRAY=
55 HAVE_SETPROCTITLE=
56 HAVE_STRLCAT=
57 HAVE_STRLCPY=
58 HAVE_STRTONUM=
59 HAVE_VASPRINTF=
60 
61 NEED_GNU_SOURCE=0
62 NEED_OPENBSD_SOURCE=0
63 
64 PREFIX="/usr/local"
65 BINDIR=
66 
67 INSTALL="install"
68 
69 # try to auto detect CFLAGS and LDFLAGS
70 if which pkg-config 2>/dev/null 1>&2; then
71 	if pkg-config libtls; then
72 		CFLAGS="${CFLAGS} $(pkg-config --cflags libtls)"
73 		LDFLAGS="$(pkg-config --libs libtls)"
74 	fi
75 	if pkg-config openssl; then
76 		CFLAGS="${CFLAGS} $(pkg-config --cflags openssl)"
77 		LDFLAGS="${LDFLAGS} $(pkg-config --libs openssl)"
78 	fi
79 
80 	case "$(uname)" in
81 		OpenBSD) ;;
82 		*)
83 			if pkg-config libevent; then
84 				CFLAGS="${CFLAGS} $(pkg-config --cflags libevent)"
85 				LDFLAGS="${LDFLAGS} $(pkg-config --libs libevent)"
86 			fi
87 			;;
88 	esac
89 fi
90 
91 # auto detect lex/flex
92 which ${LEX} 2>/dev/null 1>&2 || {
93 	echo "${LEX} not found: trying flex" 1>&2
94 	echo "${LEX} not found: trying flex" 1>&3
95 	LEX=flex
96 	which ${LEX} 2>/dev/null 1>&2 || {
97 		echo "${LEX} not found: giving up" 1>&2
98 		echo "${LEX} not found: giving up" 1>&3
99 	}
100 }
101 
102 # auto detect yacc/bison
103 which ${YACC} 2>/dev/null 1>&2 || {
104 	echo "${YACC} not found: trying bison" 1>&2
105 	echo "${YACC} not found: trying bison" 1>&3
106 	YACC=bison
107 	which ${YACC} 2>/dev/null 1>&2 || {
108 		echo "${YACC} not found: giving up" 1>&2
109 		echo "${YACC} not found: giving up" 1>&3
110 	}
111 }
112 
113 # --------
114 # allow certain variables to be overridden on the command line
115 
116 for keyvals in "$@"; do
117 	key=`echo $keyvals | cut -s -d '=' -f1`
118 	if [ -z "$key" ]; then
119 		echo "$0: invalid key-value: $keyvals" 1>&2
120 		exit 1
121 	fi
122 	val=`echo $keyvals | cut -d '=' -f 2-`
123 	case "$key" in
124 		BINDIR)  BINDIR="$val" ;;
125 		CC)      CC="$val" ;;
126 		CFLAGS)  CFLAGS="$val" ;;
127 		DESTDIR) DESTDIR="$val" ;;
128 		LDFLAGS) LDFLAGS="$val" ;;
129 		LEX)     LEX="$lex" ;;
130 		PREFIX)  PREFIX="$val" ;;
131 		YACC)    YACC="$val" ;;
132 		*)
133 			echo "$0: invalid key: $key" 1>&2
134 			exit 1
135 	esac
136 done
137 
138 # --------
139 # tests functions
140 
141 # Check whether this HAVE_ setting is manually overridden.
142 # If yes, use the override, if no, do not decide anything yet.
143 # Arguments: test file name, test var name, manual value
144 ismanual() {
145 	[ -z "${3}" ] && return 1
146 	echo "tested ${1}: HAVE_${2}=${3} (manual)" 1>&2
147 	echo "tested ${1}: HAVE_${2}=${3} (manual)" 1>&3
148 	echo 1>&3
149 	return 0
150 }
151 
152 # Run a single autoconfiguration test.
153 # In case of success, enable the feature.
154 # In case of failure, do not decide anything yet.
155 # Arguments: test file name, test var name, additional CFLAGS
156 singletest() {
157 	n=${1}${3}
158 	cat 1>&3 << __HEREDOC__
159 testing ${n} ...
160 ${COMP} -o have/${1} have/${1}.c ${3} ${LDFLAGS}
161 __HEREDOC__
162 
163 	if ${COMP} -o "have/${1}" "have/${1}.c" ${3} ${LDFLAGS} 1>&3 2>&3
164 	then
165 		echo "partial result of ${n}: ${CC} succeeded" 1>&3
166 	else
167 		echo "tested ${n}: no (compilation failed)" 1>&2
168 		echo "result of ${n}: ${CC} failed with exit status $?" 1>&3
169 		echo "result of compiling ${n}: no" 1>&3
170 		echo 1>&3
171 		return 1
172 	fi
173 
174 	if ./have/${1} 1>&3 2>&3; then
175 		echo "tested ${n}: yes" 1>&2
176 		echo "result of running ${n}: yes" 1>&3
177 		echo 1>&3
178 		eval HAVE_${2}=1
179 		[ "${3}" = "-D_GNU_SOURCE" ] && NEED_GNU_SOURCE=1
180 		[ "${3}" = "-D_OPENBSD_SOURCE" ] && NEED_OPENBSD_SOURCE=1
181 		[ "${3}" = "-lsocket" ] && LD_RECVMSG="-lsocket"
182 		rm "have/${1}"
183 		return 0
184 	else
185 		echo "tested ${n}: no (execution failed)" 1>&2
186 		echo "result of ${n}: execution failed with exit status $?" 1>&3
187 		echo "result of running ${n}: no" 1>&3
188 		echo 1>&3
189 		rm "have/${1}"
190 		return 1
191 	fi
192 }
193 
194 # Run a complete autoconfiguration test, including the check for
195 # a manual override and disabling the feature on failure.
196 # Arguments: test file name, test var name, additional CFLAGS
197 # The final argument can optionally be repeated a second time.
198 runtest() {
199 	eval _manual=\${HAVE_${2}}
200 	ismanual "${1}" "${2}" "${_manual}" && return 0
201 	singletest "${1}" "${2}" "${3}" && return 0
202 	[ -n "${4}" ] && singletest "${1}" "${2}" "${4}" && return 0
203 	eval HAVE_${2}=0
204 	return 1
205 }
206 
207 # --------
208 # compiler options
209 
210 COMP="${CC} ${CFLAGS} -Wno-unused -Werror"
211 
212 echo "selected CFLAGS=\"${CFLAGS}\"" 1>&2
213 echo "selected CFLAGS=\"${CFLAGS}\"" 1>&3
214 echo 1>&3
215 
216 if [ -n "${STATIC}" ]; then
217 	echo "selected STATIC=\"${STATIC}\" (manual)" 1>&2
218 	echo "selected STATIC=\"${STATIC}\" (manual)" 1>&3
219 	echo 1>&3
220 else
221 	runtest noop STATIC -static || true
222 	[ ${HAVE_STATIC} -eq 0 ] || STATIC="-static"
223 	echo "selected STATIC=\"${STATIC}\"" 1>&2
224 	echo "selected STATIC=\"${STATIC}\"" 1>&3
225 	echo 1>&3
226 fi
227 
228 # --------
229 # tests for config.h
230 
231 runtest err		ERR		|| true
232 runtest explicit_bzero	EXPLICIT_BZERO	|| true
233 runtest getprogname	GETPROGNAME	|| true
234 runtest libevent	LIBEVENT	|| true
235 runtest libtls		LIBTLS		|| true
236 runtest openssl		OPENSSL		|| true
237 runtest program_invocation_short_name PROGRAM_INVOCATION_SHORT_NAME "" -D_GNU_SOURCE || true
238 runtest pr_set_name	PR_SET_NAME	|| true
239 runtest recallocarray	RECALLOCARRAY	|| true
240 runtest setproctitle	SETPROCTITLE	|| true
241 runtest strlcat		STRLCAT		|| true
242 runtest strlcpy		STRLCPY		|| true
243 runtest strtonum	STRTONUM	|| true
244 runtest vasprintf	VASPRINTF	"" -D_GNU_SOURCE || true
245 
246 if [ ${HAVE_LIBTLS} -eq 0 ]; then
247 	echo "FATAL: libtls not found" 1>&2
248 	echo "FATAL: libtls not found" 1>&3
249 	exit 1
250 fi
251 
252 if [ ${HAVE_OPENSSL} -eq 0 ]; then
253 	echo "FATAL: openssl not found" 1>&2
254 	echo "FATAL: openssl not found" 1>&3
255 	exit 1
256 fi
257 
258 if [ ${HAVE_LIBEVENT} -eq 0 ]; then
259 	echo "FATAL: libevent not found" 1>&2
260 	echo "FATAL: libevent not found" 1>&3
261 	exit 1
262 fi
263 
264 # --------
265 # write config.h
266 
267 exec > config.h
268 
269 cat <<__HEREDOC__
270 #ifdef __cplusplus
271 #error "Do not use C++."
272 #endif
273 __HEREDOC__
274 
275 [ ${NEED_GNU_SOURCE} -eq 0 ] || echo "#define _GNU_SOURCE"
276 [ ${NEED_OPENBSD_SOURCE} -eq 0 ] || echo "#define _OPENBSD_SOURCE"
277 
278 [ ${HAVE_STRLCAT} -eq 0 -o ${HAVE_STRLCPY} -eq 0 ] \
279 	&& echo "#include <sys/types.h>"
280 [ ${HAVE_VASPRINTF} -eq 0 ] && echo "#include <stdarg.h>"
281 
282 cat <<__HEREDOC__
283 
284 #define HAVE_ERR		${HAVE_ERR}
285 #define HAVE_EXPLICIT_BZERO	${HAVE_EXPLICIT_BZERO}
286 #define HAVE_GETPROGNAME	${HAVE_GETPROGNAME}
287 #define HAVE_LIBEVENT		${HAVE_LIBEVENT}
288 #define HAVE_PROGRAM_INVOCATION_SHORT_NAME ${HAVE_PROGRAM_INVOCATION_SHORT_NAME}
289 #define HAVE_PR_SET_NAME	${HAVE_PR_SET_NAME}
290 #define HAVE_RECALLOCARRAY	${HAVE_RECALLOCARRAY}
291 #define HAVE_SETPROCTITLE	${SETPROCTITLE}
292 #define HAVE_STRLCAT		${HAVE_STRLCAT}
293 #define HAVE_STRLCPY		${HAVE_STRLCPY}
294 #define HAVE_STRTONUM		${HAVE_STRTONUM}
295 #define HAVE_VASPRINTF		${HAVE_VASPRINTF}
296 
297 __HEREDOC__
298 
299 [ ${HAVE_EXPLICIT_BZERO} -eq 0 -o \
300   ${HAVE_RECALLOCARRAY} -eq 0 -o \
301   ${HAVE_STRLCAT} -eq 0 -o \
302   ${HAVE_STRLCPY} -eq 0 -o \
303   ${HAVE_STRTONUM} -eq 0 ] && echo "#include <stddef.h>"
304 
305 if [ ${HAVE_ERR} -eq 0 ]; then
306 	echo "extern	void	 err(int, const char*, ...);"
307 	echo "extern	void	 errx(int, const char*, ...);"
308 	echo "extern	void	 warn(const char*, ...);"
309 	echo "extern	void	 warnx(const char*, ...);"
310 	COMPAT="${COMPAT} compat/err.o"
311 else
312 	echo "#include <err.h>"
313 fi
314 if [ ${HAVE_EXPLICIT_BZERO} -eq 0 ]; then
315 	echo "extern	void	 explicit_bzero(void*, size_t);"
316 	COMPAT="${COMPAT} compat/explicit_bzero.o"
317 fi
318 if [ ${HAVE_GETPROGNAME} -eq 0 ]; then
319 	echo "extern	const char *getprogname(void);"
320 	COMPAT="${COMPAT} compat/getprogname.o"
321 fi
322 if [ ${HAVE_RECALLOCARRAY} -eq 0 ]; then
323 	echo "extern	void*	 recallocarray(void*, size_t, size_t, size_t);"
324 	COMPAT="${COMPAT} compat/recallocarray.o"
325 fi
326 if [ ${HAVE_SETPROCTITLE} -eq 0 ]; then
327 	echo "extern	void	 setproctitle(const char *fmt, ...);"
328 	COMPAT="${COMPAT} compat/setproctitle.o"
329 fi
330 if [ ${HAVE_STRLCAT} -eq 0 ]; then
331 	echo "extern	size_t	 strlcat(char*, const char*, size_t);"
332 	COMPAT="${COMPAT} compat/strlcat.o"
333 fi
334 if [ ${HAVE_STRLCPY} -eq 0 ]; then
335 	echo "extern	size_t	 strlcpy(char*, const char*, size_t);"
336 	COMPAT="${COMPAT} compat/strlcpy.o"
337 fi
338 if [ ${HAVE_STRTONUM} -eq 0 ]; then
339 	echo "extern	long long strtonum(const char*, long long, long long, const char**);"
340 	COMPAT="${COMPAT} compat/strtonum.o"
341 fi
342 if [ ${HAVE_VASPRINTF} -eq 0 ]; then
343 	echo "extern	int	 vasprintf(char**, const char*, va_list);"
344 	COMPAT="${COMPAT} compat/vasprintf.o"
345 fi
346 echo "file config.h: written" 1>&2
347 echo "file config.h: written" 1>&3
348 
349 # --------
350 # tests for Makefile.local
351 
352 exec > Makefile.local
353 
354 [ -z "${BINDIR}"          ] && BINDIR="${PREFIX}/bin"
355 [ -z "${MANDIR}"          ] && MANDIR="${PREFIX}/man"
356 
357 [ -z "${INSTALL_PROGRAM}" ] && INSTALL_PROGRAM="${INSTALL} -m 0555"
358 [ -z "${INSTALL_LIB}"     ] && INSTALL_LIB="${INSTALL} -m 0444"
359 [ -z "${INSTALL_MAN}"     ] && INSTALL_MAN="${INSTALL} -m 0444"
360 [ -z "${INSTALL_DATA}"    ] && INSTALL_DATA="${INSTALL} -m 0444"
361 
362 cat << __HEREDOC__
363 CC		= ${CC}
364 CFLAGS		= ${CFLAGS}
365 LDFLAGS		= ${LDFLAGS}
366 YACC		= ${YACC}
367 LEX		= ${LEX}
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 
379 __HEREDOC__
380 
381 printf "COMPAT ="
382 for comp in ${COMPAT}; do
383 	printf " %s/%s" "$PWD" "$comp"
384 done
385 printf "\n"
386 
387 echo "file Makefile.local: written" 1>&2
388 echo "file Makefile.local: written" 1>&3
389 
390 exit 0