| 1 | $Cambridge: exim/test/README,v 1.1 2006/02/06 16:07:10 ph10 Exp $ |
| 2 | |
| 3 | EXPORTABLE EXIM TEST SUITE |
| 4 | -------------------------- |
| 5 | |
| 6 | This document last updated for: |
| 7 | |
| 8 | Test Suite Version: 4.61 |
| 9 | Date: 06 February 2006 |
| 10 | |
| 11 | |
| 12 | BACKGROUND |
| 13 | ---------- |
| 14 | |
| 15 | For a long time, the Exim test suite was confined to Philip Hazel's |
| 16 | workstation, because it relied on that particular environment. The problem is |
| 17 | that an MTA such as Exim interacts a great deal with its environment, so if you |
| 18 | run it somewhere else, the output will be different, which makes automatic |
| 19 | checking difficult. Even in a single environment, things are not all that easy. |
| 20 | For instance, if Exim delivers a message, the log line (which one would want to |
| 21 | compare) contains a timestamp and an Exim message id that will be different |
| 22 | each time. This issue is dealt with by a Perl script that munges the output by |
| 23 | recognizing changing sequences and replacing them with fixed values before |
| 24 | doing a comparison. Another problem with exporting the original test suite is |
| 25 | that it assumes a version of Exim with more or less every optional feature |
| 26 | enabled. |
| 27 | |
| 28 | This README describes a new test suite that is intended to be exportable and to |
| 29 | run in a number of different environments. The current status of this project |
| 30 | is "experimental and incomplete". I am releasing it in this state in order to |
| 31 | get feedback on how well it succeeds and of course to iron out any bugs. The |
| 32 | original test suite contains over 600 tests; it will be some time before they |
| 33 | are all re-implemented in the new world. |
| 34 | |
| 35 | The tests themselves are in no particular order; they accumulated over the |
| 36 | years as Exim was extended and modified. They vary greatly in size and |
| 37 | complexity. Some were specifically constructed to test new features; others |
| 38 | were made to demonstrate that a bug had been fixed. |
| 39 | |
| 40 | A few of the original tests have had to be omitted from this more general |
| 41 | suite because differences in operating system behaviour make it impossible to |
| 42 | generalize them. An example is a test that uses a version of Exim that is |
| 43 | setuid to the Exim user rather than root, with the deliver_drop_privilege |
| 44 | option set. In Linux, such a binary is able to deliver a message as the caller |
| 45 | of Exim, because it can revert to the caller's uid. In FreeBSD this is not the |
| 46 | case. |
| 47 | |
| 48 | This is early documentation; it too may be buggy... :-) It is certainly |
| 49 | incomplete, because there are features yet to be added to the test suite. |
| 50 | |
| 51 | |
| 52 | REQUIREMENTS |
| 53 | ------------ |
| 54 | |
| 55 | In order to run this test suite, the following requirements must be met: |
| 56 | |
| 57 | (1) You should run the tests on the latest version of Exim, because the suite |
| 58 | is continuously updated to test the latest features and bug fixes. The |
| 59 | version you test does not, however, have to be installed as the live |
| 60 | version. You can of course run the tests on an older Exim, but some may |
| 61 | fail. In particular, the test suite will fall apart horrible with versions |
| 62 | of Exim prior to 4.54. |
| 63 | |
| 64 | (2) You can use any non-root login to run the tests, but there must be access |
| 65 | via "sudo" to root from this login. Privilege is required to override |
| 66 | configuration change checks and for things like cleaning up spool files, |
| 67 | but on the other hand, the tests themselves need to call Exim from a |
| 68 | non-root process. The use of "sudo" is the easiest way to achieve all this. |
| 69 | The test script uses "sudo" to do a number of things as root, so it is best |
| 70 | if you set a sudo timeout so that you do not have to keep typing a |
| 71 | password. For example, if you put |
| 72 | |
| 73 | Defaults timestamp_timeout=480 |
| 74 | |
| 75 | in /etc/sudoers, a password lasts for 8 hours (a working day). It is |
| 76 | probably not a good idea to run the tests as the Exim user, as this is |
| 77 | recognized as special by Exim. |
| 78 | |
| 79 | (3) The login under which you run the tests must be in the exim group so that |
| 80 | it has access to logs, spool files, etc. The login should not be one of the |
| 81 | names "userx", "usery", "userz", or a few other simple ones such as "abcd" |
| 82 | and "xyz" and single letters that are used in the tests. (The original |
| 83 | tests use my login a lot; I'm weeding this out as I convert, and I'll try |
| 84 | to get rid of common names as well.) The test suite expects the login to |
| 85 | have a gecos name; I think it will now run if the gecos field is empty but |
| 86 | there may be anomalies. |
| 87 | |
| 88 | (4) The directory into which you unpack the test suite must be accessible by |
| 89 | the Exim user, so that code which is running as exim can access the files |
| 90 | therein. A world-readable directory is fine. However, there may be problems |
| 91 | if the path name of the directory is excessively long. This is because it |
| 92 | sometimes appears in logs lines or debug output, and if it is truncated, it |
| 93 | is no longer recognized. |
| 94 | |
| 95 | (5) Exim must be built with its user and group specified at build time, and |
| 96 | with certain minimum facilities, namely: |
| 97 | |
| 98 | Routers: accept, dnslookup, manualroute, redirect |
| 99 | Transports: appendfile, autoreply, pipe, smtp |
| 100 | Lookups: lsearch |
| 101 | |
| 102 | Most Exim binaries will have these included. |
| 103 | |
| 104 | (6) A C compiler is needed to build some test programs, and the test script is |
| 105 | written in Perl, so you need that. |
| 106 | |
| 107 | (7) Some of the tests run Exim as a daemon, and others use a testing server |
| 108 | (described below). These require TCP ports. In the configurations and |
| 109 | scripts, the ports are parameterized, but at present, fixed values are |
| 110 | written into the controlling script. These are ports 1224 to 1229. If these |
| 111 | ports are not available for use, some of the tests will fail. |
| 112 | |
| 113 | (8) There is an underlying assumption that the host on which the tests are |
| 114 | being run has an IPv4 address (which the test script seeks out). If there |
| 115 | is also an IPv6 address, additional tests are run when the Exim binary |
| 116 | contains IPv6 support. There are checks in the scripts for a running IPv4 |
| 117 | interface; when one is not found, some tests are skipped (with a warning |
| 118 | message). |
| 119 | |
| 120 | |
| 121 | OPTIONAL EXTRAS |
| 122 | --------------- |
| 123 | |
| 124 | If the Exim binary that is being tested contains extra functionality in |
| 125 | addition to the minimum specified above, additional tests are run to exercise |
| 126 | the extra functionality, except for a few special cases such as the databases |
| 127 | (MySQL, PostgreSQL, LDAP) where special data is needed for the tests. |
| 128 | |
| 129 | |
| 130 | RUNNING THE TEST SUITE |
| 131 | ---------------------- |
| 132 | |
| 133 | (1) Download the tarball exim-testsuite-x.xx.tar.bz2 and unpack it, preferably |
| 134 | in a directory alongside an Exim source directory (see below). |
| 135 | |
| 136 | (2) cd into the exim-testsuite-x.xx directory. |
| 137 | |
| 138 | (3) Run "./configure" and then "make". This builds a few auxiliary programs |
| 139 | that are written in C. |
| 140 | |
| 141 | (4) Run "./runtest" (a Perl script) as described below. |
| 142 | |
| 143 | (5) If you want to see what tests are available, run "./listtests". |
| 144 | |
| 145 | |
| 146 | BREAKING OUT OF THE TEST SCRIPT |
| 147 | ------------------------------- |
| 148 | |
| 149 | If you abandon the test run by typing ^C, the interrupt may be passed to a |
| 150 | program that the script is running, or it may be passed to the script itself. |
| 151 | In the former case, the script should detect that the program has ended |
| 152 | abnormally. In both cases, the script tries to clean up everything, including |
| 153 | killing any Exim daemons that it has started. However, there may be race |
| 154 | conditions in which the clean up does not happen. If, after breaking out of a |
| 155 | run, you see strange errors in the next run, look for any left-over Exim |
| 156 | daemons, and kill them by hand. |
| 157 | |
| 158 | |
| 159 | THE LISTTESTS SCRIPT |
| 160 | -------------------- |
| 161 | |
| 162 | The individual test scripts are in subdirectories of the "scripts" directory. |
| 163 | If you do not supply any arguments to ./listtests, it scans all the scripts in |
| 164 | all the directories, and outputs the heading line from each script. The output |
| 165 | is piped through "less", and begins like this: |
| 166 | |
| 167 | === 0000-Basic === |
| 168 | Basic/0001 Basic configuration setting |
| 169 | Basic/0002 Common string expansions |
| 170 | Basic/0003 Caseless address blocking |
| 171 | ... |
| 172 | |
| 173 | Lines that start === give the name of the subdirectory containing the test |
| 174 | scripts that follow. If you supply an argument to ./listtests, it is used as a |
| 175 | Perl pattern to match case-independently against the names of the |
| 176 | subdirectories. Only those that match are scanned. For example, "./listtests |
| 177 | ipv6" outputs this: |
| 178 | |
| 179 | === 1000-Basic-ipv6 === |
| 180 | === Requires: support IPv6 |
| 181 | Basic-ipv6/1000 -bh and non-canonical IPv6 addresses |
| 182 | Basic-ipv6/1001 recognizing IPv6 address in HELO/EHLO |
| 183 | |
| 184 | === 2250-dnsdb-ipv6 === |
| 185 | === Requires: support IPv6 |
| 186 | lookup dnsdb |
| 187 | dnsdb-ipv6/2250 dnsdb ipv6 lookup in string expansions |
| 188 | |
| 189 | If you supply a second argument to ./listtests, it is used as a Perl pattern to |
| 190 | match case-independently against the individual script titles. For example, |
| 191 | "./listtests . mx" lists all tests whose titles contain "mx", because "." |
| 192 | matches all the subdirectory names. |
| 193 | |
| 194 | |
| 195 | THE RUNTEST SCRIPT |
| 196 | ------------------ |
| 197 | |
| 198 | If you do not supply any arguments to ./runtest, it searches for an Exim |
| 199 | source tree at the same level as the test suite directory. It then looks for an |
| 200 | Exim binary in a "build" directory of that source tree. If there are several |
| 201 | Exim source trees, it chooses the latest version of Exim. Consider the |
| 202 | following example: |
| 203 | |
| 204 | $ ls -F /source/exim |
| 205 | exim-4.50/ exim-4.52/ exim-testsuite-0.00/ |
| 206 | |
| 207 | A simple ./runtest from within the test suite will use a 4.52 binary if it |
| 208 | finds one, otherwise a 4.50 binary. If a binary cannot be found, the script |
| 209 | prompts for one. Alternatively, you can supply the binary on the command line: |
| 210 | |
| 211 | ./runtest /usr/exim/bin/exim |
| 212 | |
| 213 | The test suite also uses some of the Exim utilities (such as exim_dbmbuild), |
| 214 | and it expects to find them in the same directory as Exim itself. If they are |
| 215 | not found, the tests that use them are omitted. A suitable comment is output. |
| 216 | |
| 217 | On the ./runtest command line, following the name of the binary, if present, |
| 218 | there may be a number of options and then one or two numbers. The full syntax |
| 219 | is as follows: |
| 220 | |
| 221 | ./runtest [binary name] [runtest options] [exim options] \ |
| 222 | [first test] [last test] |
| 223 | |
| 224 | There are some options for the ./runtest script itself: |
| 225 | |
| 226 | -DEBUG This option is for debugging the test script. It causes some |
| 227 | tracing information to be output. |
| 228 | |
| 229 | -DIFF By default, file comparisons are done using a private compare |
| 230 | command called "cf", which is built from source that is provided in |
| 231 | the src directory. This is a command I've had for nearly 20 years - |
| 232 | look at the source comments for its history - whose output I |
| 233 | prefer. However, if you want to use "diff" instead, give -DIFF as a |
| 234 | runtest option. In that case, "diff -u" is used for comparisons. |
| 235 | (If it turns out that most people prefer to use diff, I'll change |
| 236 | the default.) |
| 237 | |
| 238 | -KEEP Normally, after a successful run, the test output files are |
| 239 | deleted. This option prevents this. It is useful when running a |
| 240 | single test, in order to look at the actual output before it is |
| 241 | modified for comparison with saved output. |
| 242 | |
| 243 | -NOIPV4 Pretend that an IPv4 interface was not found. This is useful for |
| 244 | testing that the test suite correctly skips tests that require |
| 245 | a running IPv4 interface. |
| 246 | |
| 247 | -NOIPV6 Pretend that an IPv6 interface was not found. This is useful for |
| 248 | testing that the test suite correctly skips tests that require |
| 249 | a running IPv6 interface. |
| 250 | |
| 251 | -UPDATE If this option is set, any detected changes in test output are |
| 252 | automatically accepted and used to update the stored copies of the |
| 253 | output. It is a dangerous option, but it useful for the test suite |
| 254 | maintainer after making a change to the code that affects a lot of |
| 255 | tests (for example, the wording of a message). |
| 256 | |
| 257 | The options for ./runtest must be given first (but after the name of the |
| 258 | binary, if present). Any further options, that is, items on the command line |
| 259 | that start with a hyphen, are passed to the Exim binary when it is run as part |
| 260 | of a test. The only sensible use of this is to pass "-d" in order to run a test |
| 261 | with debugging enabled. Any other options are likely to conflict with options |
| 262 | that are set in the tests. Some tests are already set up to run with debugging. |
| 263 | In these cases, -d on the command line overrides their own debug settings. |
| 264 | |
| 265 | The final two arguments specify the range of tests to be run. Test numbers lie |
| 266 | in the range 1 to 9999. If no numbers are given, the defaults are 1 and 8999 |
| 267 | (sic). Tests with higher numbers (9000 upwards) are not run automatically |
| 268 | because they require specific data (such as a particular MySQL table) that is |
| 269 | unlikely to be generally available. |
| 270 | |
| 271 | Tests that require certain optional features of Exim are grouped by number, so |
| 272 | in any given range, not all the tests will exist. Non-existent tests are just |
| 273 | skipped, but if there are no tests at all in the given range, a message is |
| 274 | output. |
| 275 | |
| 276 | If you give only one number, just that test is run (if it exists). Instead of a |
| 277 | second number, you can give the character "+", which is interpreted as "to the |
| 278 | end". Normally this is 8999; if the starting number is 9000 or higher, "+" is |
| 279 | interpreted as 9999. Examples: |
| 280 | |
| 281 | ./runtest 1300 |
| 282 | ./runtest 1400 1699 |
| 283 | ./runtest /usr/sbin/exim 5000 + |
| 284 | ./runtest -DIFF -d 81 |
| 285 | |
| 286 | When the script starts up, the first thing it does is to check that you have |
| 287 | sudo access to root. Then it outputs the version number of the Exim binary that |
| 288 | it is testing, and also information about the optional facilities that are |
| 289 | present (obtained from "exim -bV"). This is followed by some environmental |
| 290 | information, including the current login id and the hosts's IP address. The |
| 291 | script checks that the current user is in the Exim group, and that the Exim |
| 292 | user has access to the test suite directory. |
| 293 | |
| 294 | The script outputs the list of tests requested, and a list of tests that will |
| 295 | be omitted because the relevant optional facilities are not in the binary. You |
| 296 | are then invited to press Return to start the tests running. |
| 297 | |
| 298 | |
| 299 | TEST OUTPUT |
| 300 | ----------- |
| 301 | |
| 302 | When all goes well, the only permanent output is the identity of the tests as |
| 303 | they are run, and "Script completed" for each test script, for example: |
| 304 | |
| 305 | Basic/0001 Basic configuration setting |
| 306 | Script completed |
| 307 | Basic/0002 Basic string expansions |
| 308 | Script completed |
| 309 | Basic/0003 Caseless address blocking |
| 310 | Script completed |
| 311 | Basic/0004 Caseful address blocking |
| 312 | Script completed |
| 313 | Basic/0005 -bs to simple local delivery |
| 314 | ... |
| 315 | |
| 316 | While a script is running, it shows "Test n" on the screen, for each of the |
| 317 | Exim tests within the script. There may also be comments from some tests when a |
| 318 | delay is expected, for example, if there is a "sleep" while testing a timeout. |
| 319 | |
| 320 | Before each set of optional tests, an extra identifying line is output. For |
| 321 | example: |
| 322 | |
| 323 | >>> The following tests require: authenticator cram_md5 |
| 324 | CRAM-MD5/2500 CRAM-MD5 server tests |
| 325 | Script completed |
| 326 | CRAM-MD5/2501 CRAM-MD5 client tests |
| 327 | Script completed |
| 328 | |
| 329 | If a test fails, you are shown the output of the text comparison that failed, |
| 330 | and prompted as to what to do next. The output is shown using the "less" |
| 331 | command, or "more" if "less" is not available. By default, the output is from |
| 332 | the "cf" program, and might look like this: |
| 333 | |
| 334 | DBM/1300 DBM files and exim_dbmbuild |
| 335 | =============== |
| 336 | Lines 7-9 of "test-stdout-munged" do not match lines 7-11 of "stdout/1300". |
| 337 | ---------- |
| 338 | exim_dbmbuild exit code = 1 |
| 339 | Continued set of lines is too long: max permitted length is 99999 |
| 340 | exim_dbmbuild exit code = 1 |
| 341 | ---------- |
| 342 | dbmbuild abandoned |
| 343 | exim_dbmbuild exit code = 2 |
| 344 | Continued set of lines is too long: max permitted length is 99999 |
| 345 | dbmbuild abandoned |
| 346 | exim_dbmbuild exit code = 2 |
| 347 | =============== |
| 348 | 1 difference found. |
| 349 | "test-stdout-munged" contains 16 lines; "stdout/1300" contains 18 lines. |
| 350 | |
| 351 | Continue, Update & retry, Quit? [Q] |
| 352 | |
| 353 | This example was generated by running the test with a version of Exim |
| 354 | that had a bug in the exim_dbmbuild utility (the bug was fixed at release |
| 355 | 4.53). See "How the tests work" below for a description of the files that are |
| 356 | used. In this case, the standard output differed from what was expected. |
| 357 | |
| 358 | The reply to the prompt must either be empty, in which case it takes the |
| 359 | default that is given in brackets (in this case Q), or a single letter, in |
| 360 | upper or lower case (in this case, one of C, U, or Q). If you type anything |
| 361 | else, the prompt is repeated. |
| 362 | |
| 363 | "Continue" carries on as if the files had matched; that is, it ignores the |
| 364 | mismatch. Any other output files for the same test will be compared before |
| 365 | moving on to the next test. |
| 366 | |
| 367 | "Update & retry" copies the new file to the saved file, and reruns the test |
| 368 | after doing any further comparisons that may be necessary. |
| 369 | |
| 370 | Other circumstances give rise to other prompts. If a test generates output for |
| 371 | which there is no saved data, the prompt (after a message stating which file is |
| 372 | unexpectely not empty) is: |
| 373 | |
| 374 | Continue, Show, or Quit? [Q] |
| 375 | |
| 376 | "Show" displays the data on the screen, and then you get the "Continue..." |
| 377 | prompt. If a test ends with an unexpected return code, the prompt is: |
| 378 | |
| 379 | show stdErr, show stdOut, Continue (without file comparison), or Quit? [Q] |
| 380 | |
| 381 | Typically in these cases there will be something interesting in the stderr |
| 382 | or stdout output. There is a similar prompt after the "server" auxiliary |
| 383 | program fails. |
| 384 | |
| 385 | |
| 386 | OPENSSL AND GNUTLS ERROR MESSAGES |
| 387 | --------------------------------- |
| 388 | |
| 389 | Some of the TLS tests deliberately cause errors to check how Exim handles them. |
| 390 | It has been observed that different releases of the OpenSSL and GnuTLS |
| 391 | libraries generate different error messages. This may cause the comparison with |
| 392 | the saved output to fail. Such errors can be ignored. |
| 393 | |
| 394 | |
| 395 | OTHER SCRIPTS AND PROGRAMS |
| 396 | -------------------------- |
| 397 | |
| 398 | There is a freestanding Perl script called "listtests" that scans the test |
| 399 | scripts and outputs a list of all the tests, with a short descriptive comment |
| 400 | for each one. Special requirements for groups of tests are also noted. |
| 401 | |
| 402 | The main runtest script makes use of a second Perl script and some compiled C |
| 403 | programs. These are: |
| 404 | |
| 405 | patchexim A Perl script that makes a patched version of Exim (see the |
| 406 | next section for details). |
| 407 | |
| 408 | bin/cf A text comparison program (see above). |
| 409 | |
| 410 | bin/checkaccess A program that is run as root; it changes uid/gid to the |
| 411 | Exim user and group, and then checks that it can access |
| 412 | files in the test suite's directory. |
| 413 | |
| 414 | bin/client A script-driven SMTP client simulation. |
| 415 | |
| 416 | bin/client-gnutls A script-driven SMTP client simulation with GnuTLS support. |
| 417 | This is built only if GnuTLS support is detected on the host. |
| 418 | |
| 419 | bin/client-ssl A script-driven SMTP client simulation with OpenSSL support. |
| 420 | This is built only if OpenSSL support is detected on the |
| 421 | host. |
| 422 | |
| 423 | bin/fakens A fake "nameserver" for DNS tests (see below for details). |
| 424 | |
| 425 | bin/fd A program that outputs details of open file descriptors. |
| 426 | |
| 427 | bin/iefbr14 A program that does nothing, and returns 0. It's just like |
| 428 | the "true" command, but it is in a known place. |
| 429 | |
| 430 | bin/loaded Some dynamically loaded functions for testing dlfunc support. |
| 431 | |
| 432 | bin/server A script-driven SMTP server simulation. |
| 433 | |
| 434 | The runtest script also makes use of a number of ordinary commands such as |
| 435 | "cp", "kill", "more", and "rm", via the system() call. In some cases these are |
| 436 | run as root by means of sudo. |
| 437 | |
| 438 | |
| 439 | STANDARD SUBSTITUTIONS |
| 440 | ---------------------- |
| 441 | |
| 442 | In the following sections, there are several references to the "standard |
| 443 | substitutions". These make changes to some of the stored files when they are |
| 444 | used in a test. To save repetition, the substitutions themselves are documented |
| 445 | here: |
| 446 | |
| 447 | CALLER is replaced by the login name of the user running the tests |
| 448 | CALLER_GID is replaced by the caller's group id |
| 449 | CALLER_UID is replaced by the caller's user id |
| 450 | DIR is replaced by the name of the test-suite directory |
| 451 | EXIMGROUP is replaced by the name of the Exim group |
| 452 | EXIMUSER is replaced by the name of the Exim user |
| 453 | HOSTIPV4 is replaced by the local host's IPv4 address |
| 454 | HOSTIPV6 is replaced by the local host's IPv6 address |
| 455 | HOSTNAME is replaced by the local host's name |
| 456 | PORT_D is replaced by a port number for normal daemon use |
| 457 | PORT_N is replaced by a port number that should never respond |
| 458 | PORT_S is replaced by a port number for normal bin/server use |
| 459 | TESTNUM is replaced by the current test number |
| 460 | V4NET is replaced by an IPv4 network number for testing |
| 461 | V6NET is replaced by an IPv6 network number for testing |
| 462 | |
| 463 | PORT_D is currently hard-wired to 1225, PORT_N to 1223, and PORT_S to 1224. |
| 464 | V4NET is hardwired to 224 and V6NET to ff00. These networks are used for DNS |
| 465 | testing purposes, and for testing Exim with -bh. The only requirement is that |
| 466 | they are networks that can never be used for an IP address of a real host. I've |
| 467 | chosen two multicast networks for the moment. |
| 468 | |
| 469 | If the host has no IPv6 address, "<no IPv6 address found>" is substituted but |
| 470 | that does not matter because no IPv6 tests will be run. A similar substitution |
| 471 | is made if there is no IPv4 address, and again, tests that actually require a |
| 472 | running IPv4 interface should be skipped. |
| 473 | |
| 474 | If the host has more than one IPv4 or IPv6 address, the first one that |
| 475 | "ifconfig" lists is used. If the only available address is 127.0.0.1 (or ::1 |
| 476 | for IPv6) it is used, but another value is prefered if available. |
| 477 | |
| 478 | In situations where a specific test is not being run (for example, when setting |
| 479 | up dynamic data files), TESTNUM is replaced by an empty string, but should not |
| 480 | in fact occur in such files. |
| 481 | |
| 482 | |
| 483 | HOW THE TESTS WORK |
| 484 | ------------------ |
| 485 | |
| 486 | Each numbered script runs Exim (sometimes several times) with its own Exim |
| 487 | configuration file. The configurations are stored in the "confs" directory, |
| 488 | and before running each test, a copy of the appropriate configuration, with the |
| 489 | standard substitutions, is made in the file test-config. The -C command line |
| 490 | option is used to tell Exim to use this configuration. |
| 491 | |
| 492 | The -D option is used to pass the path of the Exim binary to the configuration. |
| 493 | This is not standardly substituted, because there are two possible binaries |
| 494 | that might be used in the same test (one setuid to root, the other to the exim |
| 495 | user). Some tests also make use of -D to vary the configuration for different |
| 496 | calls to the Exim binary. |
| 497 | |
| 498 | Normally, of course, Exim gives up root privilege when -C and -D are used by |
| 499 | unprivileged users. We do not want this to happen when running the tests, |
| 500 | because we want to be able to test all aspects of Exim, including receiving |
| 501 | mail from unprivileged users. The way this is handled is as follows: |
| 502 | |
| 503 | At the start of the runtest script, the patchexim script is run as root. This |
| 504 | script makes a copy of the Exim binary that is to be tested, patching it as it |
| 505 | does so. (This is a binary patch, not a source patch.) The patch causes the |
| 506 | binary, when run, to "know" that it is running in the test harness. It does not |
| 507 | give up root privilege when -C and -D are used, and in a few places it takes |
| 508 | other special actions, such as delaying when starting a subprocess to allow |
| 509 | debug output from the parent to be written first. If you want to know more, |
| 510 | grep the Exim source files for "running_in_test_harness". |
| 511 | |
| 512 | The patched binary is placed in the directory eximdir/exim and given the normal |
| 513 | setuid root privilege. This is, of course, a dangerous binary to have lying |
| 514 | around, especially if there are unprivileged users on the system. To protect |
| 515 | it, the eximdir directory is created with the current user as owner, exim as |
| 516 | the group owner, and with access drwx--x---. Thus, only the user who is running |
| 517 | the tests (who is known to have access to root) and the exim user have access |
| 518 | to the modified Exim binary. When runtest terminates, the patched binary is |
| 519 | removed. |
| 520 | |
| 521 | Each set of tests proceeds by interpreting its controlling script. The scripts |
| 522 | are in subdirectories of the "scripts" directory. They are split up according |
| 523 | to the requirements of the tests they contain, with the 0000-Basic directory |
| 524 | containing tests that can always be run. Run the "listtests" script to obtain a |
| 525 | list of tests. |
| 526 | |
| 527 | |
| 528 | TEST OUTPUT |
| 529 | ----------- |
| 530 | |
| 531 | Output from script runs is written to the files test-stdout and test-stderr. |
| 532 | When an Exim server is involved, test-stdout-server and test-stderr-server are |
| 533 | used for its output. Before being compared with the saved output, the |
| 534 | non-server and server files are concatenated, so a single saved file contains |
| 535 | both. |
| 536 | |
| 537 | A directory called spool is used for Exim's spool files, and for Exim logs. |
| 538 | These locations are specified in every test's configuration file. |
| 539 | |
| 540 | When messages are delivered to files, the files are put in the test-mail |
| 541 | directory. Output from comparisons is written to test-cf. |
| 542 | |
| 543 | Before comparisons are done, output texts are modified ("munged") to change or |
| 544 | remove parts that are expected to vary from run to run. The modified files all |
| 545 | end with the suffix "-munged". Thus, you will see test-stdout-munged, |
| 546 | test-mainlog-munged, test-mail-munged, and so on. Other files whose names start |
| 547 | with "test-" are created and used by some of the tests. |
| 548 | |
| 549 | At the end of a successful test run, the spool directory and all the files |
| 550 | whose names begin with "test-" are removed. If the run ends unsuccessfully |
| 551 | (typically after a "Q" response to a prompt), the spool and test files are left |
| 552 | in existence so that the problem can be investigated. |
| 553 | |
| 554 | |
| 555 | TEST COMMANDS |
| 556 | ------------- |
| 557 | |
| 558 | Each test script consists of a list of commands, each optionally preceded by |
| 559 | comments (lines starting with #) and (also optionally) a line containing an |
| 560 | expected return code. Some of the commands are followed by data lines |
| 561 | terminated by a line of four asterisks. |
| 562 | |
| 563 | The first line of each script must be a comment that briefly describes the |
| 564 | script. For example: |
| 565 | |
| 566 | # -bS Use of HELO/RSET |
| 567 | |
| 568 | A line consisting just of digits is interpreted as the expected return code |
| 569 | for the command that follows. The default expectation when no such line exists |
| 570 | is a zero return code. For example, here is a complete test script, containing |
| 571 | just one command: |
| 572 | |
| 573 | # -bS Unexpected EOF in headers |
| 574 | 1 |
| 575 | exim -bS -odi |
| 576 | mail from:<someone@some.where> |
| 577 | rcpt to:<blackhole@HOSTNAME> |
| 578 | data |
| 579 | from: me |
| 580 | **** |
| 581 | |
| 582 | The expected return code in this case is 1, and the data lines are passed to |
| 583 | Exim on its standard input. Both the command line and the data lines have the |
| 584 | standard substitions applied to them. Thus, HOSTNAME in the example above will |
| 585 | be replaced by the local host's name. Long commands can be continued over |
| 586 | several lines by using \ as a continuation character. This does *not* apply to |
| 587 | data lines. |
| 588 | |
| 589 | Here follows a [currently incomplete] list of supported commands. They can be |
| 590 | divided into two groups: |
| 591 | |
| 592 | |
| 593 | Commands with no input |
| 594 | ---------------------- |
| 595 | |
| 596 | These commands are not followed by any input data, or by a line of asterisks. |
| 597 | |
| 598 | dbmbuild <file1> <file1> |
| 599 | |
| 600 | This command runs the exim_dbmbuild utility to build a DBM file. It is used |
| 601 | only when DBM support is available in Exim, and typically follows the use of a |
| 602 | "write" command (see below) that creates the input file. |
| 603 | |
| 604 | |
| 605 | echo <text> |
| 606 | |
| 607 | The text is written to the screen; this is used to output comments from |
| 608 | scripts. |
| 609 | |
| 610 | |
| 611 | gnutls |
| 612 | |
| 613 | This command is present at the start of all but one of the tests that use |
| 614 | GnuTLS. It copies a pre-existing parameter file into the spool directory, so |
| 615 | that Exim does not have to re-create the file each time. The first GnuTLS test |
| 616 | does not do this, in order to test that Exim can create the file (it takes some |
| 617 | time). |
| 618 | |
| 619 | |
| 620 | killdaemon |
| 621 | |
| 622 | This command must be given in any script that starts an Exim daemon, normally |
| 623 | at the end. It searches for the PID file in the spool directory, and sends a |
| 624 | SIGINT signal to the Exim daemon process whose PID it finds. See below for |
| 625 | comments about starting Exim daemons. |
| 626 | |
| 627 | |
| 628 | millisleep <m> |
| 629 | |
| 630 | This command causes the script to sleep for m milliseconds. Nothing is output |
| 631 | to the screen. |
| 632 | |
| 633 | |
| 634 | need_ipv4 |
| 635 | |
| 636 | This command must be at the head of a script. If no IPv4 interface has been |
| 637 | found, the entire script is skipped, and a comment is output. |
| 638 | |
| 639 | |
| 640 | need_ipv6 |
| 641 | |
| 642 | This command must be at the head of a script. If no IPv6 interface has been |
| 643 | found, the entire script is skipped, and a comment is output. |
| 644 | |
| 645 | |
| 646 | need_move_frozen_messages |
| 647 | |
| 648 | This command must be at the head of a script. If the Exim binary does not have |
| 649 | support for moving frozen messages (which is an optional feature), the entire |
| 650 | script is skipped, and a comment is output. |
| 651 | |
| 652 | |
| 653 | no_message_check |
| 654 | |
| 655 | If this command is encountered anywhere in the script, messages that are |
| 656 | delivered when the script runs are not compared with saved versions. |
| 657 | |
| 658 | |
| 659 | no_msglog_check |
| 660 | |
| 661 | If this command is encountered anywhere in the script, message log files that |
| 662 | are still in existence at the end of the run (for messages that were not |
| 663 | delivered) are not compared with saved versions. |
| 664 | |
| 665 | no_stderr_check |
| 666 | |
| 667 | If this command is encountered anywhere in the script, the stderr output from |
| 668 | the run is not compared with a saved version. |
| 669 | |
| 670 | |
| 671 | no_stdout_check |
| 672 | |
| 673 | If this command is encountered anywhere in the script, the stdout output from |
| 674 | the run is not compared with a saved version. |
| 675 | |
| 676 | |
| 677 | rmfiltertest |
| 678 | |
| 679 | This command indicates that the script is for a certain type of filter test, in |
| 680 | which there are a lot of repetitive stdout lines that get in the way, because |
| 681 | filter tests output data about the sender and recipient. Such lines are removed |
| 682 | from the stdout output before comparing, for ease of human perusal. |
| 683 | |
| 684 | |
| 685 | sleep <n> |
| 686 | |
| 687 | This command causes the script to sleep for n seconds. If n is greater than |
| 688 | one, "sleep <n>" is output to the screen, followed by a dot for every second |
| 689 | that passes. |
| 690 | |
| 691 | |
| 692 | sortlog |
| 693 | |
| 694 | This command causes special sorting to occur on the mainlog file before |
| 695 | comparison. Every sequence of contiguous delivery lines (lines containing the |
| 696 | => -> or *> flags) is sorted. This is necessary in some tests that use parallel |
| 697 | deliveries because on different systems the processes may terminate in a |
| 698 | different order. |
| 699 | |
| 700 | |
| 701 | A number of standard file management commands are recognized. These are chmod, |
| 702 | chown, ln, ls, du, mkdir, mkfifo, and touch. Some are run as root using "sudo". |
| 703 | |
| 704 | |
| 705 | Commands with input |
| 706 | ------------------- |
| 707 | |
| 708 | The remaining commands are followed by data lines for their standard input, |
| 709 | terminated by four asterisks. Even if no data is required for the particular |
| 710 | usage, the asterisks must be given. |
| 711 | |
| 712 | |
| 713 | catwrite <file name> [nxm[=start-of-line-text]]* |
| 714 | |
| 715 | This command operates like the "write" command, which is described below, |
| 716 | except that the out it generates is copied to the end of the test-stdout file |
| 717 | as well as to the named file. |
| 718 | |
| 719 | |
| 720 | |
| 721 | client [<options>] <ip address> <port> [<outgoing interface>] |
| 722 | |
| 723 | This command runs the auxiliary "client" program that simulates an SMTP client. |
| 724 | It is controlled by a script read from its standard input, details of which are |
| 725 | given below. The only option is -t, which must be followed by a number, to |
| 726 | specify the command timeout in seconds. The program connects to the given IP |
| 727 | address and port, using the specified interface, if one is given. |
| 728 | |
| 729 | |
| 730 | client-ssl [<options>] <ip address> <port> [<outgoing interface>] \ |
| 731 | [<cert file>] [<key file>] |
| 732 | |
| 733 | When OpenSSL is available on the host, an alternative version of the client |
| 734 | program is compiled, one that supports TLS using OpenSSL. The additional |
| 735 | arguments specify a certificate and key file when required. There is one |
| 736 | additional option, -tls-on-connect, that causes the client to initiate TLS |
| 737 | negotiation immediately on connection. |
| 738 | |
| 739 | |
| 740 | client-gnutls [<options>] <ip address> <port> [<outgoing interface>] \ |
| 741 | [<cert file>] [<key file>] |
| 742 | |
| 743 | When GnuTLS is available on the host, an alternative version of the client |
| 744 | program is compiled, one that supports TLS using GnuTLS. The additional |
| 745 | arguments specify a certificate and key file when required. There is one |
| 746 | additional option, -tls-on-connect, that causes the client to initiate TLS |
| 747 | negotiation immediately on connection. |
| 748 | |
| 749 | |
| 750 | exim [<options>] [<arguments>] |
| 751 | |
| 752 | This command runs the testing version of Exim. Any occurrence of "$msg1" in the |
| 753 | command line is replaced by the ID of the first (oldest) message in Exim's |
| 754 | (testing) spool. "$msg2" refers to the second, and so on. The name "exim" can |
| 755 | be preceded by an environment setting as in this example: |
| 756 | |
| 757 | LDAPTLS_REQCERT=never exim -be |
| 758 | |
| 759 | It can also be preceded by a number; this specifies a number of seconds to wait |
| 760 | before closing the stdout pipe to Exim, and is used for some timeout tests. For |
| 761 | example: |
| 762 | |
| 763 | 3 exim -bs |
| 764 | |
| 765 | Finally, "exim" can be preceded by "sudo", to run Exim as root. If more than |
| 766 | one of these prefixes is present, they must be in the above order. |
| 767 | |
| 768 | |
| 769 | exim_exim [<options>] [<arguments>] |
| 770 | |
| 771 | This runs an alternative version of Exim that is setuid to exim rather than to |
| 772 | root. |
| 773 | |
| 774 | |
| 775 | server [<options>] <port or socket> [<connection count>] |
| 776 | |
| 777 | This command runs the auxiliary "server" program that simulates an SMTP (or |
| 778 | other) server. It is controlled by a script that is read from its standard |
| 779 | input, details of which are given below. A number of options are implemented: |
| 780 | |
| 781 | -d causes the server to output debugging information |
| 782 | |
| 783 | -t sets a timeout in seconds (default 5) for when the server is |
| 784 | awaiting an incoming connection |
| 785 | |
| 786 | -noipv4 causes the server not to set up an IPv4 socket |
| 787 | |
| 788 | -noipv6 causes the server not to set up an IPv6 socket |
| 789 | |
| 790 | By default, in an IPv6 environment, both kinds of socket are set up. However, |
| 791 | the test script knows which interfaces actually exist on the host, and it adds |
| 792 | -noipv4 or -noipv6 to the server command as required. An error occurs if both |
| 793 | these options are given. |
| 794 | |
| 795 | The only required argument is either a port number or the path name of a Unix |
| 796 | domain socket. The port is normally PORT_S, which is changed to an actual |
| 797 | number by the standard substitutions. The optional final argument specifies the |
| 798 | number of different connections to expect (default 1). These must happen |
| 799 | serially (one at a time). There is no support for multiple simultaneous |
| 800 | connections. Here are some example commands: |
| 801 | |
| 802 | server PORT_S |
| 803 | server -t 10 PORT_S 3 |
| 804 | server /tmp/somesocket |
| 805 | |
| 806 | The following lines, up to a line of four asterisks, are the server's |
| 807 | controlling standard input (described below). These lines are read and |
| 808 | remembered; during the following commands, until an "exim" command is reached, |
| 809 | the server is run in parallel. |
| 810 | |
| 811 | |
| 812 | write <file name> [nxm[=start-of-line-text]]* |
| 813 | |
| 814 | The "write" command is a way of creating files of specific sizes for buffering |
| 815 | tests, or containing specific data lines. Being able to do this from within the |
| 816 | script saves holding lots of little test files. The optional argument specifies |
| 817 | n lines of length m. The lines consist of the letter "a". If start of line text |
| 818 | is supplied, it replaces "a"s at the start of each line. Underscores in the |
| 819 | start of line text are turned into spaces. The optional argument may be |
| 820 | repeated. The data lines that follow a "write" command are split into two by a |
| 821 | line of four plus signs. Any above the split are written before the |
| 822 | fixed-length lines, and any below the split are written after. For example: |
| 823 | |
| 824 | write test-data 3x30=AB_ 1x50 |
| 825 | Pre-data |
| 826 | lines |
| 827 | ++++ |
| 828 | Post-data |
| 829 | lines |
| 830 | **** |
| 831 | |
| 832 | This command generates a file containing: |
| 833 | |
| 834 | Pre-data |
| 835 | lines |
| 836 | AB aaaaaaaaaaaaaaaaaaaaaaaaaaa |
| 837 | AB aaaaaaaaaaaaaaaaaaaaaaaaaaa |
| 838 | AB aaaaaaaaaaaaaaaaaaaaaaaaaaa |
| 839 | aaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaa |
| 840 | Post-data |
| 841 | lines |
| 842 | |
| 843 | If there are no fixed-length line specifiers, there is no need to split the |
| 844 | data, and a line of plusses is not needed. |
| 845 | |
| 846 | |
| 847 | [sudo] perl |
| 848 | |
| 849 | This command runs Perl, with the data as its standard input, to allow arbitrary |
| 850 | one-off things to be done. |
| 851 | |
| 852 | |
| 853 | CLIENT SCRIPTS |
| 854 | -------------- |
| 855 | |
| 856 | Lines in client scripts are of two kinds: |
| 857 | |
| 858 | (1) If a line begins with three question marks and a space, the rest of the |
| 859 | line defines the start of expected output from the server. If what is |
| 860 | received does not match, the client bombs out with an error message. |
| 861 | |
| 862 | (2) If a line starts with three plus signs followed by a space, the rest of the |
| 863 | line specifies a number of seconds to sleep for before proceeding. |
| 864 | |
| 865 | (3) Otherwise, the line is an input line line that is sent to the server. Any |
| 866 | occurrences of \r and \n in the line are turned into carriage return and |
| 867 | linefeed, respectively. This is used for testing PIPELINING. |
| 868 | |
| 869 | Here is a simple example: |
| 870 | |
| 871 | client 127.0.0.1 PORT_D |
| 872 | ??? 250 |
| 873 | EHLO xxx |
| 874 | ??? 250- |
| 875 | ??? 250 |
| 876 | AUTH PLAIN AbdXi0AdnD2CVy |
| 877 | ??? 535 |
| 878 | quit |
| 879 | ??? 221 |
| 880 | **** |
| 881 | |
| 882 | In the case of client-gnutls and client-ssl, if a command is "starttls", this |
| 883 | is remembered, and after a subsequent OK response, an attempt to move into TLS |
| 884 | mode occurs. If a command is "starttls_wait", the client sends "starttls" but |
| 885 | does not start up TLS; this is for testing timeouts. If a command is "stoptls", |
| 886 | an existing TLS connection is shut down, but nothing is sent. |
| 887 | |
| 888 | |
| 889 | SERVER SCRIPTS |
| 890 | -------------- |
| 891 | |
| 892 | The server program sleeps till a connection occurs or its timeout is reached, |
| 893 | in which case it bombs out. The next set of command lines are interpreted. They |
| 894 | are of the following kinds: |
| 895 | |
| 896 | (1) A line that starts with '>' or with a digit is an output line that is sent |
| 897 | to the client. In the case of '>': |
| 898 | |
| 899 | (a) If the line starts with ">>", no terminating CRLF is sent. |
| 900 | (b) If the line starts with ">CR>", just CR is sent at the end. |
| 901 | (c) If the line starts with ">LF>", just LF is sent at the end. |
| 902 | (d) If the line starts with ">*eof", nothing is sent and the connection |
| 903 | is closed. |
| 904 | |
| 905 | The data that is sent starts after the initial '>' sequence. |
| 906 | |
| 907 | (2) A line that starts with "*sleep" specifies a number of seconds to wait |
| 908 | before proceeding. |
| 909 | |
| 910 | (3) A line containing "*eof" specifies that the client is expected to close |
| 911 | the connection at this point. |
| 912 | |
| 913 | (4) A line containing just '.' specifies that the client is expected to send |
| 914 | many lines, terminated by one that contains just a dot. |
| 915 | |
| 916 | (5) Otherwise, the line defines the start of an input line that the client |
| 917 | is expected to send. To allow for lines that start with digits, the line |
| 918 | may start with '<', which is not taken as part of the input data. If the |
| 919 | input does not match, the server bombs out with an error message. |
| 920 | |
| 921 | Here is a simple server example: |
| 922 | |
| 923 | server PORT_S |
| 924 | 220 Greetings |
| 925 | EHLO |
| 926 | 250 Hello there |
| 927 | MAIL FROM |
| 928 | 250 OK |
| 929 | RCPT TO |
| 930 | 250 OK |
| 931 | DATA |
| 932 | 354 Send it! |
| 933 | . |
| 934 | 250 OK |
| 935 | QUIT |
| 936 | 225 OK |
| 937 | **** |
| 938 | |
| 939 | After a "server" command in a test script, the server runs in parallel until an |
| 940 | "exim" command is reached. The "exim" command attempts to deliver one or more |
| 941 | messages to port PORT_S on the local host. When it has finished, the test |
| 942 | script waits for the "server" process to finish. |
| 943 | |
| 944 | |
| 945 | AUXILIARY DATA FILES |
| 946 | -------------------- |
| 947 | |
| 948 | Many of the tests make use of auxiliary data files. There are two types; those |
| 949 | whose content is fixed, and those whose content needs to be varied according to |
| 950 | the current environment. The former are kept in the directory aux-fixed. The |
| 951 | latter are distributed in the directory aux-var-src, and copied with the |
| 952 | standard substitutions into the directory aux-var at the start of each test |
| 953 | run. |
| 954 | |
| 955 | Most of the auxiliary files have names that start with a test number, |
| 956 | indicating that they are specific to that one test. A few fixed files (for |
| 957 | example, some TLS certificates) are used by more than one test, and so their |
| 958 | names are not of this form. |
| 959 | |
| 960 | There are also some auxilary DNS zone files, which are described in the next |
| 961 | section. |
| 962 | |
| 963 | |
| 964 | DNS LOOKUPS AND GETHOSTBYNAME |
| 965 | ----------------------------- |
| 966 | |
| 967 | The original test suite required special testing zones to be loaded into a |
| 968 | local nameserver. This is no longer a requirement for the new suite. Instead, a |
| 969 | program called fakens is used to simulate a nameserver. When Exim is running in |
| 970 | the test harness, instead of calling res_search() - the normal call to the DNS |
| 971 | resolver - it calls a testing function. This handles a few special names itself |
| 972 | (for compatibility with the old test suite), but otherwise passes the query to |
| 973 | the fakens program. |
| 974 | |
| 975 | The fakens program consults "zone files" in the directory called dnszones, and |
| 976 | returns data in the standard resource record format for Exim to process as if |
| 977 | it came from the DNS. However, if the requested domain is not in any of the |
| 978 | zones that fakens knows about, it returns a special code that causes Exim to |
| 979 | pass the query on to res_search(). The zone files are: |
| 980 | |
| 981 | db.test.ex A zone for the domain test.ex. |
| 982 | db.ip4.10 A zone for one special case in 10.250.0.0/16 (see below) |
| 983 | db.ip4.V4NET A zone for the domain V4NET.in-addr.arpa. |
| 984 | db.ip4.127 A zone for the domain 127.in-addr.arpa. |
| 985 | db.ip6.V6NET A zone for the domain inverted(V6NET).ip6.arpa. |
| 986 | db.ip6.0 A zone for the domain 0.ip6.arpa. |
| 987 | |
| 988 | V4NET and V6NET are substituted with the current testing networks (see above). |
| 989 | In the case of V6NET, the network is four hex digits, and it is split and |
| 990 | inverted appropriately when setting up the zone. |
| 991 | |
| 992 | These fake zone files are built dynamically from sources in the dnszones-src |
| 993 | directory by applying the standard substitutions. The test suite also builds |
| 994 | dynamic zone files for the name of the current host and its IP address(es). The |
| 995 | idea is that there should not be any need to rely on an external DNS. |
| 996 | |
| 997 | The domain names that are handled directly by Exim, without being passed to |
| 998 | fakens, are: |
| 999 | |
| 1000 | test.again.dns This always provokes a TRY_AGAIN response, for testing the |
| 1001 | handling of temporary DNS error. If the full domain name |
| 1002 | starts with digits, a delay of that many seconds occurs. |
| 1003 | |
| 1004 | test.fail.dns This always provokes a NO_RECOVERY response, for testing |
| 1005 | DNS server failures. |
| 1006 | |
| 1007 | This special handling could now be done in the fakens program, but while the |
| 1008 | old test suite is still being used it has to be done in Exim itself, so for the |
| 1009 | moment it remains there. |
| 1010 | |
| 1011 | The use of gethostbyname() and its IPv6 friends is also subverted when Exim is |
| 1012 | running in the test harness. The test code handles a few special names |
| 1013 | directly; for all the others it uses DNS lookups, which are then handled as |
| 1014 | just described. Thus, the use of /etc/hosts is completely bypassed. The names |
| 1015 | that are specially handled are: |
| 1016 | |
| 1017 | manyhome.test.ex This name is used for testing hosts with ridiculously large |
| 1018 | numbers of IP addresses; 2048 IP addresses are generated |
| 1019 | and returned. Doing it this way saves having to make the |
| 1020 | interface to fakens handle more records that can fit in the |
| 1021 | data block. The addresses that are generated are in the |
| 1022 | 10.250.0.0/16 network. |
| 1023 | |
| 1024 | localhost Always returns 127.0.0.1 or ::1, for IPv4 and IPv6 lookups, |
| 1025 | respectively. |
| 1026 | |
| 1027 | <an IP address> If the IP address is of the correct form for the lookup |
| 1028 | type (IPv4 or IPv6), it is returned. Otherwise a panic-die |
| 1029 | error occurs. |
| 1030 | |
| 1031 | The reverse zone db.ip4.10 is provided just for the manyhome.test.ex case. It |
| 1032 | contains a single wildcard resource record. It also contains the line |
| 1033 | |
| 1034 | PASS ON NOT FOUND |
| 1035 | |
| 1036 | Whenever fakens finds this line in a zone file, it returns PASS_ON instead of |
| 1037 | HOST_NOT_FOUND. This causes Exim to pass the query to res_search(). |
| 1038 | |
| 1039 | **** |