amavisd-milter: aclocal/ax_path_milter.m4

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1 dnl @synopsis AX_PATH_MILTER([MINIMUM-VERSION, [ACTION-IF-FOUND [, ACTION-IF-NOT-FOUND]]]) 2 dnl 3 dnl This macro tries to automatically find the library libmilter.a and 4 dnl the header file "libmilter/mfapi.h", which are required when compiling 5 dnl a milter for Sendmail. When successful, it sets the output variable 6 dnl MILTER_LIBS to "-lmilter", MILTER_LDFLAGS to contain an -Lpathtolib 7 dnl option, and MILTER_CPPFLAGS to contain an -Ipathtoinclude option, if 8 dnl they are necessary. 9 dnl 10 dnl The easiest way to use this macro is something like: 11 dnl 12 dnl AX_PATH_MILTER([8.12],[ 13 dnl LIBS="$MILTER_LIBS $LIBS" 14 dnl LDFLAGS="$MILTER_LDFLAGS $LDFLAGS" 15 dnl CPPFLAGS="$CPPFLAGS $MILTER_CPPFLAGS" 16 dnl ],[ 17 dnl AC_MSG_ERROR([required milter library and header not found]) 18 dnl ]) 19 dnl 20 dnl If the macro is successful, it just adds any flags to the necessary 21 dnl environment. If it is not successful, it would likely be a fatal 22 dnl error, because if an application is linking with libmilter.a, 23 dnl it is probably because it is a milter. 24 dnl 25 dnl There are two optional "--with" options for configure which are added. 26 dnl If they are specified, they override any searching that is done. 27 dnl They are: 28 dnl 29 dnl --with-sendmail-base=<DIR> This option is used to explicitly 30 dnl specify the base of the sendmail distribution. 31 dnl 32 dnl --with-sendmail-obj=<DIR> The option is used to explicitly specify 33 dnl the "obj.*" subdirectory in the sendmail distribution 34 dnl that should be used. 35 dnl 36 dnl When sendmail-base is not specified, the current environment is first 37 dnl tested to see if the header and library are available, and if so 38 dnl MILTER_LDFLAGS and MILTER_CPPFLAGS are left empty. 39 dnl 40 dnl There are two places that are searched for the sendmail base 41 dnl directory. The first location is one directory down from the 42 dnl current directory. It checks if there is a directory of the 43 dnl form sendmail-8.1*, limited to version 8.12.x or higher, then 44 dnl chooses the directory with the highest version number. 45 dnl If that method does not succeed, it then looks in the file 46 dnl /etc/mail/sendmail.cf for the directory it was built from, 47 dnl and uses the base of that distribution. If neither of these 48 dnl methods work, then it fails. 49 dnl 50 dnl There are two methods for finding the "obj.*" directory when it is 51 dnl not specified. The first is to try to run sendmail's Build program 52 dnl with the -M option which will print out the name of the obj. directory 53 dnl for the tool in the directory where it is run from. If this 54 dnl does not work, is looks for the newest directory of the 55 dnl form "obj.*" in the sendmail base directory. 56 dnl 57 dnl Two addition output variables that are defined, whether or not the 58 dnl files are found are SENDMAIL_BASE_DIR and SENDMAIL_OBJ_DIR, which 59 dnl are the suspected location of the sendmail base directory and 60 dnl obj.* subdirectory. 61 dnl 62 dnl NOTE: POSIX threads MUST be configured BEFORE this function is called 63 dnl or it will not find libmilter.a even if it exists. The easiest way is 64 dnl to use the ACX_PTHREAD macro by Steven G. Johnson and Alejandro Forero 65 dnl Cuervo which is available from the Autoconf Macro Archive. 66 dnl 67 dnl @author Tim Toolan <toolan@ele.uri.edu> 68 dnl 69 ############################################################################### 70 AC_DEFUN([AX_PATH_MILTER], [ 71 72 # Used to indicate success or failure of this function. 73 ax_path_milter_ok=no 74 75 # Convert sections of MINIMUM-VERSION to three digit numbers by adding zeros. 76 # For example 8.12.9 would become 008.012.009 77 ac_milter_minimum_version=`echo "$1" | sed 's,$[[0-9]]*$,x\1x,g;s,x$[[0-9]]$x,x0\1x,g;s,x$[[0-9]][[0-9]]$x,x0\1x,g;s,x,,g'` 78 79 # Add options --with-sendmail --with-sendmail-base and --with-sendmail-obj 80 # to configure. 81 AC_ARG_WITH([sendmail], 82 [ --with-sendmail=<DIR> base directory of sendmail installation]) 83 AC_ARG_WITH([sendmail-base], 84 [ --with-sendmail-base=<DIR> base directory of sendmail distribution]) 85 AC_ARG_WITH([sendmail-obj], 86 [ --with-sendmail-obj=<DIR> obj.* subdirectory in sendmail distribution]) 87 88 # Check for functions required by libmilter. 89 AC_CHECK_FUNC(inet_aton, [], [AC_SEARCH_LIBS(inet_aton, [socket nsl resolv])]) 90 AC_CHECK_FUNC(socket, [], [AC_SEARCH_LIBS(socket, [socket nsl])]) 91 AC_CHECK_FUNC(gethostbyname, [], [AC_SEARCH_LIBS(gethostbyname, [socket nsl])]) 92 93 # Check if the linker accepts --rpath (for Darwin) 94 AC_MSG_CHECKING([if ld accepts --rpath]) 95 SAVEDLDFLAGS=$LDFLAGS 96 LDFLAGS=$LDFLAGS" -Wl,--rpath=/" 97 AC_LINK_IFELSE([AC_LANG_PROGRAM([],[])], 98 [rpath="--rpath="; ldrpath=yes], [rpath="-L"; ldrpath=no]) 99 LDFLAGS=$SAVEDLDFLAGS 100 AC_MSG_RESULT([$ldrpath]) 101 102 103 ############################################################################### 104 # 105 # If neither --with-sendmail-base or --with-sendmail-obj is specified 106 # check the existing environment first for mfapi.h and libmilter without 107 # modifying CPPFLAGS, LDFLAGS, and LIBS first. 108 # 109 if test "x$with_sendmail_base$with_sendmail_obj" = "x" ; then 110 if test "x$with_sendmail" != "x" ; then 111 CPPFLAGS="$CPPFLAGS -I$with_sendmail/include" 112 LDFLAGS="$LDFLAGS -L$with_sendmail/lib -Wl,$rpath$with_sendmail/lib" 113 AC_MSG_CHECKING([for sendmail install directory]) 114 AC_MSG_RESULT([$with_sendmail]) 115 else 116 AC_MSG_CHECKING([for sendmail install directory]) 117 AC_MSG_RESULT([default]) 118 fi 119 AC_CHECK_HEADER([libmilter/mfapi.h],[ 120 AC_CHECK_LIB([milter],[smfi_main],[ 121 # both tests succeeded so indicate success 122 ax_path_milter_ok=yes 123 124 # add -lmilter to the libraries to link 125 MILTER_LIBS="-lmilter" 126 ]) 127 ]) 128 129 # Debian use for libmilter.a /usr/lib/libmilter instead of /usr/lib 130 if test "$ax_path_milter_ok" = "no" ; then 131 unset ac_cv_lib_milter_smfi_main 132 ac_milter_save_LDFLAGS="$LDFLAGS" 133 MILTER_LDFLAGS="-L/usr/lib/libmilter" 134 LDFLAGS="$MILTER_LDFLAGS $LDFLAGS" 135 AC_CHECK_HEADER([libmilter/mfapi.h],[ 136 AC_CHECK_LIB([milter],[smfi_main],[ 137 # both tests succeeded so indicate success 138 ax_path_milter_ok=yes 139 140 # add -lmilter to the libraries to link 141 MILTER_LIBS="-lmilter" 142 ]) 143 ]) 144 LDFLAGS="$ac_milter_save_LDFLAGS" 145 fi 146 147 if test "$ax_path_milter_ok" = "no" ; then 148 # Unset the cached test results because we will be trying them again later. 149 ac_milter_tmp=abcdefg 150 if unset ac_milter_tmp 2> /dev/null ; then 151 unset ac_cv_header_libmilter_mfapi_h 152 unset ac_cv_lib_milter_smfi_main 153 else 154 AC_MSG_WARN( 155 [system doesn't have unset so either use --with-sendmail-base 156 or set LDFLAGS and CPPFLAGS with the necessary -L and -I options]) 157 fi 158 fi 159 fi 160 161 ############################################################################### 162 # 163 # If didn't already fine necessary files then search. 164 # 165 if test "$ax_path_milter_ok" = "no" ; then 166 ############################################################################# 167 # 168 # Determine the sendmail base directory and set SENDMAIL_BASE_DIR. 169 # 170 if test "x$with_sendmail_base" != "x" ; then 171 AC_MSG_CHECKING([for sendmail base directory]) 172 # set SENDMAIL_BASE_DIR to the one specified by--with-sendmail-base 173 SENDMAIL_BASE_DIR="$with_sendmail_base" 174 AC_MSG_RESULT([$SENDMAIL_BASE_DIR]) 175 else 176 AC_MSG_CHECKING([for sendmail base directory in ../ ]) 177 # 178 # --with-sendmail-base is not used, so we will try to determine it 179 # 180 # 1) List all directories one level down that look like sendmail. 181 # 2) Select ones that are sendmail 8.12 or higher (including 8.13 182 # versions when they come out). 183 # 3) Replace any single digit last version numbers with a two digit 184 # version number (ie. 8.12.9 becomes 8.12.09). 185 # 4) Sort all of the directories found in reverse order. 186 # 5) Take the first one (the highest version). 187 # 6) Restore the single digit version numbers. 188 # 189 ac_milter_tmp=`ls -d ../sendmail-8.1* 2> /dev/null | grep '../sendmail-8.1[[2-9]]' | sed 's,\.$[[0-9]]$$,.0\1,' | sort -r | sed '1q' | sed 's,\.0$[[0-9]]$$,.\1,'` 190 191 # Convert found version sections to three digit numbers by adding zeros. 192 ac_milter_found_version=`echo "$ac_milter_tmp" | sed 's,.*/sendmail-,,;s,$[[0-9]]*$,x\1x,g;s,x$[[0-9]]$x,x0\1x,g;s,x$[[0-9]][[0-9]]$x,x0\1x,g;s,x,,g'` 193 194 # If ac_milter_minimum_version is equal to ac_milter_lower_version, then 195 # the found version is greater than or equal to the minumum version. 196 # Pick the version string that is the lesser of the two. 197 # An empty string would be less than anything. 198 # In short, ac_milter_version_ok will equal yes if the version is ok, 199 # and no otherwise. 200 ac_milter_version_ok=`echo "x$ac_milter_minimum_version 201 x$ac_milter_found_version" | sort | sed '1q' | sed "s,x${ac_milter_minimum_version},yes,;s,x${ac_milter_found_version},no," ` 202 203 # If we have something add the current directory to it. 204 if test "x$ac_milter_tmp" != "x" ; then 205 ac_milter_tmp="`pwd`/$ac_milter_tmp" 206 fi 207 208 if test -r "${ac_milter_tmp}/include/libmilter/mfapi.h" && \ 209 test "$ac_milter_version_ok" = "yes" ; then 210 # The file mfapi.h exists so we will use this as SENDMAIL_BASE_DIR. 211 SENDMAIL_BASE_DIR="$ac_milter_tmp" 212 AC_MSG_RESULT([$SENDMAIL_BASE_DIR]) 213 else 214 AC_MSG_RESULT([no]) 215 AC_MSG_CHECKING([for sendmail base from /etc/mail/sendmail.cf]) 216 # 217 # The previous method to find SENDMAIL_BASE_DIR failed, so we will 218 # try this method. 219 # 220 # 1) Check for a line in /etc/mail/sendmail.cf of the form: 221 # ##### in /some/path/sendmail-8.x.x/more/path 222 # This is the directory that the sendmail.cf file was built in. 223 # 2) Take the first occurrence if there are more than one. 224 # 3) Remove the leading "##### in ". 225 # 4) Remove everything after the sendmail-8.x.x path component. 226 # 227 dnl # Note that the following expression only should not use double 228 dnl # square brackets because for some reason, possibly having to 229 dnl # do with the pound sign, m4 doesn't convert them to single brackets. 230 dnl # 231 ac_milter_tmp=`grep "^##### in /" /etc/mail/sendmail.cf 2> /dev/null | grep "/sendmail-8.1" | sed '1q' | sed 's,^##### in ,,' | sed 's,$/sendmail-8\.[0-9.]*$.*,\1,'` 232 233 # Convert found version sections to three digit numbers by adding zeros. 234 ac_milter_found_version=`echo "$ac_milter_tmp" | sed 's,.*/sendmail-,,;s,$[[0-9]]*$,x\1x,g;s,x$[[0-9]]$x,x0\1x,g;s,x$[[0-9]][[0-9]]$x,x0\1x,g;s,x,,g'` 235 236 # ac_milter_version_ok will equal yes if the version is ok, otherwise no. 237 ac_milter_version_ok=`echo "x$ac_milter_minimum_version 238 x$ac_milter_found_version" | sort | sed '1q' | sed "s,x${ac_milter_minimum_version},yes,;s,x${ac_milter_found_version},no," ` 239 240 if test -r "${ac_milter_tmp}/include/libmilter/mfapi.h" && \ 241 test "$ac_milter_version_ok" = "yes" ; then 242 # The file mfapi.h exists so we will use this as SENDMAIL_BASE_DIR. 243 SENDMAIL_BASE_DIR="$ac_milter_tmp" 244 AC_MSG_RESULT([$SENDMAIL_BASE_DIR]) 245 else 246 AC_MSG_RESULT([no]) 247 fi 248 fi 249 fi 250 251 ############################################################################# 252 # 253 # Determine the sendmail obj.* directory and set SENDMAIL_OBJ_DIR. 254 # We can only do this if we found SENDMAIL_BASE_DIR. 255 # 256 if test "x$SENDMAIL_BASE_DIR" != "x" ; then 257 if test "x$with_sendmail_obj" != "x" ; then 258 # set SENDMAIL_OBJ_DIR to the one specified by--with-sendmail-obj 259 SENDMAIL_OBJ_DIR="$with_sendmail_obj" 260 else 261 AC_MSG_CHECKING([for sendmail obj.* subdirectory using Build -M]) 262 # 263 # --with-sendmail-obj is not used, so we will try to determine it 264 # 265 # Try to run sendmail's Build program with the -M option which will 266 # print out the name of the obj. directory for the tool in the 267 # directory where it is run from. 268 # 269 ac_milter_tmp=`(cd ${SENDMAIL_BASE_DIR}/libmilter 1> /dev/null ; ./Build -M ) 2> /dev/null` 270 271 if test -f "${ac_milter_tmp}/libmilter.a" ; then 272 # libmilter.a exists so this is the one we will choose 273 # Remove beginning and end of path from obj.* directory. 274 SENDMAIL_OBJ_DIR=`echo "$ac_milter_tmp" | sed 's,/libmilter$,,;s,.*/,,'` 275 AC_MSG_RESULT([${SENDMAIL_BASE_DIR}/${SENDMAIL_OBJ_DIR}]) 276 else 277 AC_MSG_RESULT([no]) 278 AC_MSG_CHECKING([for sendmail obj.* subdirectory using ls]) 279 # 280 # List all directories of the form "obj." in the sendmail base 281 # directory, and choose the one with the latest modification date. 282 # 283 ac_milter_tmp=`ls -dt ${SENDMAIL_BASE_DIR}/obj.*/libmilter 2> /dev/null | sed '1q'` 284 285 if test -f "${ac_milter_tmp}/libmilter.a" ; then 286 # libmilter.a exists so this is the one we will choose 287 # Remove beginning and end of path from obj.* directory. 288 SENDMAIL_OBJ_DIR=`echo "$ac_milter_tmp" | sed 's,/libmilter$,,;s,.*/,,'` 289 AC_MSG_RESULT([${SENDMAIL_BASE_DIR}/${SENDMAIL_OBJ_DIR}]) 290 else 291 AC_MSG_RESULT([no]) 292 fi 293 fi 294 fi 295 fi 296 297 ############################################################################# 298 # 299 # If we have both SENDMAIL_BASE_DIR and SENDMAIL_OBJ_DIR we will check 300 # for the necessary files. 301 # 302 if test "x$SENDMAIL_BASE_DIR" != "x" && \ 303 test "x$SENDMAIL_OBJ_DIR" != "x" ; then 304 305 # Save and modify CPPFLAGS. 306 ac_milter_save_CPPFLAGS="$CPPFLAGS" 307 MILTER_CPPFLAGS="-I$SENDMAIL_BASE_DIR/include" 308 CPPFLAGS="$CPPFLAGS $MILTER_CPPFLAGS" 309 310 # Save and modify LDFLAGS. 311 ac_milter_save_LDFLAGS="$LDFLAGS" 312 MILTER_LDFLAGS="-L${SENDMAIL_BASE_DIR}/${SENDMAIL_OBJ_DIR}/libmilter" 313 LDFLAGS="$MILTER_LDFLAGS $LDFLAGS" 314 315 AC_CHECK_HEADER([libmilter/mfapi.h],[ 316 AC_CHECK_LIB([milter],[smfi_main],[ 317 # both tests succeeded so add -lmilter to the libraries to link 318 MILTER_LIBS="-lmilter" 319 320 # indicate success 321 ax_path_milter_ok=yes 322 ]) 323 ]) 324 325 # Restore the modified environment 326 CPPFLAGS="$ac_milter_save_CPPFLAGS" 327 LDFLAGS="$ac_milter_save_LDFLAGS" 328 329 fi 330 fi 331 332 # If failure, clear MILTER_LIBS, MILTER_LDFLAGS and MILTER_CPPFLAGS. 333 if test "$ax_path_milter_ok" = "no" ; then 334 MILTER_CPPFLAGS="" 335 MILTER_LIBS="" 336 MILTER_LDFLAGS="" 337 fi 338 339 # export these to the make environment 340 AC_SUBST([MILTER_LIBS]) 341 AC_SUBST([MILTER_CPPFLAGS]) 342 AC_SUBST([MILTER_LDFLAGS]) 343 AC_SUBST([SENDMAIL_BASE_DIR]) 344 AC_SUBST([SENDMAIL_OBJ_DIR]) 345 346 # Indicate status of checking for libmilter stuff. 347 AC_MSG_CHECKING([if files required by libmilter are present]) 348 349 # Finally, execute ACTION-IF-FOUND/ACTION-IF-NOT-FOUND. 350 if test "$ax_path_milter_ok" = "yes" ; then 351 AC_MSG_RESULT([yes]) 352 $2 353 else 354 AC_MSG_RESULT([no]) 355 $3 356 fi 357 358 ])dnl