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