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a14e5636 | 1 | $Cambridge: exim/test/README,v 1.8 2007/02/20 15:58:02 ph10 Exp $ |
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2 | |
3 | EXPORTABLE EXIM TEST SUITE | |
4 | -------------------------- | |
5 | ||
6 | This document last updated for: | |
7 | ||
bbe15da8 | 8 | Test Suite Version: 4.67 |
a14e5636 | 9 | Date: 20 February 2007 |
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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 | |
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29 | run in a number of different environments. The tests themselves are in no |
30 | particular order; they accumulated over the years as Exim was extended and | |
31 | modified. They vary greatly in size and complexity. Some were specifically | |
32 | constructed to test new features; others were made to demonstrate that a bug | |
33 | had been fixed. | |
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34 | |
35 | A few of the original tests have had to be omitted from this more general | |
36 | suite because differences in operating system behaviour make it impossible to | |
37 | generalize them. An example is a test that uses a version of Exim that is | |
38 | setuid to the Exim user rather than root, with the deliver_drop_privilege | |
39 | option set. In Linux, such a binary is able to deliver a message as the caller | |
40 | of Exim, because it can revert to the caller's uid. In FreeBSD this is not the | |
41 | case. | |
42 | ||
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43 | |
44 | REQUIREMENTS | |
45 | ------------ | |
46 | ||
47 | In order to run this test suite, the following requirements must be met: | |
48 | ||
1b781f48 | 49 | (1) You should run the tests on a matching version of Exim, because the suite |
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50 | is continuously updated to test the latest features and bug fixes. The |
51 | version you test does not, however, have to be installed as the live | |
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52 | version. You can of course try the tests on any version of Exim, but some |
53 | may fail. In particular, the test suite will fall apart horrible with | |
54 | versions of Exim prior to 4.54. | |
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55 | |
56 | (2) You can use any non-root login to run the tests, but there must be access | |
57 | via "sudo" to root from this login. Privilege is required to override | |
58 | configuration change checks and for things like cleaning up spool files, | |
59 | but on the other hand, the tests themselves need to call Exim from a | |
60 | non-root process. The use of "sudo" is the easiest way to achieve all this. | |
61 | The test script uses "sudo" to do a number of things as root, so it is best | |
62 | if you set a sudo timeout so that you do not have to keep typing a | |
63 | password. For example, if you put | |
64 | ||
65 | Defaults timestamp_timeout=480 | |
66 | ||
67 | in /etc/sudoers, a password lasts for 8 hours (a working day). It is | |
68 | probably not a good idea to run the tests as the Exim user, as this is | |
69 | recognized as special by Exim. | |
70 | ||
71 | (3) The login under which you run the tests must be in the exim group so that | |
72 | it has access to logs, spool files, etc. The login should not be one of the | |
73 | names "userx", "usery", "userz", or a few other simple ones such as "abcd" | |
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74 | and "xyz" and single letters that are used in the tests. The test suite |
75 | expects the login to have a gecos name; I think it will now run if the | |
76 | gecos field is empty but there may be anomalies. | |
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77 | |
78 | (4) The directory into which you unpack the test suite must be accessible by | |
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79 | the Exim user, so that code running as exim can access the files therein. A |
80 | world-readable directory is fine. However, there may be problems if the | |
81 | path name of the directory is excessively long. This is because it | |
82 | sometimes appears in log lines or debug output, and if it is truncated, it | |
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83 | is no longer recognized. |
84 | ||
85 | (5) Exim must be built with its user and group specified at build time, and | |
86 | with certain minimum facilities, namely: | |
87 | ||
88 | Routers: accept, dnslookup, manualroute, redirect | |
89 | Transports: appendfile, autoreply, pipe, smtp | |
90 | Lookups: lsearch | |
91 | ||
92 | Most Exim binaries will have these included. | |
93 | ||
94 | (6) A C compiler is needed to build some test programs, and the test script is | |
95 | written in Perl, so you need that. | |
96 | ||
97 | (7) Some of the tests run Exim as a daemon, and others use a testing server | |
98 | (described below). These require TCP ports. In the configurations and | |
99 | scripts, the ports are parameterized, but at present, fixed values are | |
100 | written into the controlling script. These are ports 1224 to 1229. If these | |
101 | ports are not available for use, some of the tests will fail. | |
102 | ||
103 | (8) There is an underlying assumption that the host on which the tests are | |
104 | being run has an IPv4 address (which the test script seeks out). If there | |
105 | is also an IPv6 address, additional tests are run when the Exim binary | |
106 | contains IPv6 support. There are checks in the scripts for a running IPv4 | |
107 | interface; when one is not found, some tests are skipped (with a warning | |
108 | message). | |
109 | ||
110 | ||
111 | OPTIONAL EXTRAS | |
112 | --------------- | |
113 | ||
114 | If the Exim binary that is being tested contains extra functionality in | |
115 | addition to the minimum specified above, additional tests are run to exercise | |
116 | the extra functionality, except for a few special cases such as the databases | |
117 | (MySQL, PostgreSQL, LDAP) where special data is needed for the tests. | |
118 | ||
119 | ||
120 | RUNNING THE TEST SUITE | |
121 | ---------------------- | |
122 | ||
123 | (1) Download the tarball exim-testsuite-x.xx.tar.bz2 and unpack it, preferably | |
124 | in a directory alongside an Exim source directory (see below). | |
125 | ||
126 | (2) cd into the exim-testsuite-x.xx directory. | |
127 | ||
128 | (3) Run "./configure" and then "make". This builds a few auxiliary programs | |
129 | that are written in C. | |
130 | ||
131 | (4) Run "./runtest" (a Perl script) as described below. | |
132 | ||
133 | (5) If you want to see what tests are available, run "./listtests". | |
134 | ||
135 | ||
136 | BREAKING OUT OF THE TEST SCRIPT | |
137 | ------------------------------- | |
138 | ||
139 | If you abandon the test run by typing ^C, the interrupt may be passed to a | |
140 | program that the script is running, or it may be passed to the script itself. | |
141 | In the former case, the script should detect that the program has ended | |
142 | abnormally. In both cases, the script tries to clean up everything, including | |
143 | killing any Exim daemons that it has started. However, there may be race | |
144 | conditions in which the clean up does not happen. If, after breaking out of a | |
145 | run, you see strange errors in the next run, look for any left-over Exim | |
146 | daemons, and kill them by hand. | |
147 | ||
148 | ||
149 | THE LISTTESTS SCRIPT | |
150 | -------------------- | |
151 | ||
152 | The individual test scripts are in subdirectories of the "scripts" directory. | |
153 | If you do not supply any arguments to ./listtests, it scans all the scripts in | |
154 | all the directories, and outputs the heading line from each script. The output | |
155 | is piped through "less", and begins like this: | |
156 | ||
157 | === 0000-Basic === | |
158 | Basic/0001 Basic configuration setting | |
159 | Basic/0002 Common string expansions | |
160 | Basic/0003 Caseless address blocking | |
161 | ... | |
162 | ||
163 | Lines that start === give the name of the subdirectory containing the test | |
164 | scripts that follow. If you supply an argument to ./listtests, it is used as a | |
165 | Perl pattern to match case-independently against the names of the | |
166 | subdirectories. Only those that match are scanned. For example, "./listtests | |
167 | ipv6" outputs this: | |
168 | ||
169 | === 1000-Basic-ipv6 === | |
170 | === Requires: support IPv6 | |
171 | Basic-ipv6/1000 -bh and non-canonical IPv6 addresses | |
172 | Basic-ipv6/1001 recognizing IPv6 address in HELO/EHLO | |
173 | ||
174 | === 2250-dnsdb-ipv6 === | |
175 | === Requires: support IPv6 | |
176 | lookup dnsdb | |
177 | dnsdb-ipv6/2250 dnsdb ipv6 lookup in string expansions | |
178 | ||
179 | If you supply a second argument to ./listtests, it is used as a Perl pattern to | |
180 | match case-independently against the individual script titles. For example, | |
181 | "./listtests . mx" lists all tests whose titles contain "mx", because "." | |
182 | matches all the subdirectory names. | |
183 | ||
184 | ||
185 | THE RUNTEST SCRIPT | |
186 | ------------------ | |
187 | ||
188 | If you do not supply any arguments to ./runtest, it searches for an Exim | |
189 | source tree at the same level as the test suite directory. It then looks for an | |
190 | Exim binary in a "build" directory of that source tree. If there are several | |
191 | Exim source trees, it chooses the latest version of Exim. Consider the | |
192 | following example: | |
193 | ||
194 | $ ls -F /source/exim | |
1b781f48 | 195 | exim-4.60/ exim-4.62/ exim-testsuite-x.xx/ |
151b83f8 | 196 | |
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197 | A simple ./runtest from within the test suite will use a 4.62 binary if it |
198 | finds one, otherwise a 4.60 binary. If a binary cannot be found, the script | |
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199 | prompts for one. Alternatively, you can supply the binary on the command line: |
200 | ||
201 | ./runtest /usr/exim/bin/exim | |
202 | ||
1b781f48 PH |
203 | A matching test suite is released with each Exim release; if you use a test |
204 | suite that does not match the binary, some tests may fail. | |
205 | ||
206 | The test suite uses some of the Exim utilities (such as exim_dbmbuild), and it | |
207 | expects to find them in the same directory as Exim itself. If they are not | |
208 | found, the tests that use them are omitted. A suitable comment is output. | |
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209 | |
210 | On the ./runtest command line, following the name of the binary, if present, | |
211 | there may be a number of options and then one or two numbers. The full syntax | |
212 | is as follows: | |
213 | ||
214 | ./runtest [binary name] [runtest options] [exim options] \ | |
215 | [first test] [last test] | |
216 | ||
217 | There are some options for the ./runtest script itself: | |
218 | ||
219 | -DEBUG This option is for debugging the test script. It causes some | |
220 | tracing information to be output. | |
221 | ||
222 | -DIFF By default, file comparisons are done using a private compare | |
223 | command called "cf", which is built from source that is provided in | |
224 | the src directory. This is a command I've had for nearly 20 years - | |
225 | look at the source comments for its history - whose output I | |
226 | prefer. However, if you want to use "diff" instead, give -DIFF as a | |
227 | runtest option. In that case, "diff -u" is used for comparisons. | |
228 | (If it turns out that most people prefer to use diff, I'll change | |
229 | the default.) | |
230 | ||
231 | -KEEP Normally, after a successful run, the test output files are | |
232 | deleted. This option prevents this. It is useful when running a | |
233 | single test, in order to look at the actual output before it is | |
234 | modified for comparison with saved output. | |
235 | ||
236 | -NOIPV4 Pretend that an IPv4 interface was not found. This is useful for | |
237 | testing that the test suite correctly skips tests that require | |
238 | a running IPv4 interface. | |
239 | ||
240 | -NOIPV6 Pretend that an IPv6 interface was not found. This is useful for | |
241 | testing that the test suite correctly skips tests that require | |
242 | a running IPv6 interface. | |
243 | ||
244 | -UPDATE If this option is set, any detected changes in test output are | |
245 | automatically accepted and used to update the stored copies of the | |
246 | output. It is a dangerous option, but it useful for the test suite | |
247 | maintainer after making a change to the code that affects a lot of | |
248 | tests (for example, the wording of a message). | |
249 | ||
250 | The options for ./runtest must be given first (but after the name of the | |
251 | binary, if present). Any further options, that is, items on the command line | |
252 | that start with a hyphen, are passed to the Exim binary when it is run as part | |
253 | of a test. The only sensible use of this is to pass "-d" in order to run a test | |
254 | with debugging enabled. Any other options are likely to conflict with options | |
255 | that are set in the tests. Some tests are already set up to run with debugging. | |
256 | In these cases, -d on the command line overrides their own debug settings. | |
257 | ||
258 | The final two arguments specify the range of tests to be run. Test numbers lie | |
259 | in the range 1 to 9999. If no numbers are given, the defaults are 1 and 8999 | |
260 | (sic). Tests with higher numbers (9000 upwards) are not run automatically | |
261 | because they require specific data (such as a particular MySQL table) that is | |
262 | unlikely to be generally available. | |
263 | ||
264 | Tests that require certain optional features of Exim are grouped by number, so | |
265 | in any given range, not all the tests will exist. Non-existent tests are just | |
266 | skipped, but if there are no tests at all in the given range, a message is | |
267 | output. | |
268 | ||
269 | If you give only one number, just that test is run (if it exists). Instead of a | |
270 | second number, you can give the character "+", which is interpreted as "to the | |
271 | end". Normally this is 8999; if the starting number is 9000 or higher, "+" is | |
272 | interpreted as 9999. Examples: | |
273 | ||
274 | ./runtest 1300 | |
275 | ./runtest 1400 1699 | |
276 | ./runtest /usr/sbin/exim 5000 + | |
277 | ./runtest -DIFF -d 81 | |
278 | ||
279 | When the script starts up, the first thing it does is to check that you have | |
280 | sudo access to root. Then it outputs the version number of the Exim binary that | |
281 | it is testing, and also information about the optional facilities that are | |
282 | present (obtained from "exim -bV"). This is followed by some environmental | |
283 | information, including the current login id and the hosts's IP address. The | |
284 | script checks that the current user is in the Exim group, and that the Exim | |
285 | user has access to the test suite directory. | |
286 | ||
287 | The script outputs the list of tests requested, and a list of tests that will | |
288 | be omitted because the relevant optional facilities are not in the binary. You | |
289 | are then invited to press Return to start the tests running. | |
290 | ||
291 | ||
292 | TEST OUTPUT | |
293 | ----------- | |
294 | ||
295 | When all goes well, the only permanent output is the identity of the tests as | |
296 | they are run, and "Script completed" for each test script, for example: | |
297 | ||
298 | Basic/0001 Basic configuration setting | |
299 | Script completed | |
300 | Basic/0002 Basic string expansions | |
301 | Script completed | |
302 | Basic/0003 Caseless address blocking | |
303 | Script completed | |
304 | Basic/0004 Caseful address blocking | |
305 | Script completed | |
306 | Basic/0005 -bs to simple local delivery | |
307 | ... | |
308 | ||
309 | While a script is running, it shows "Test n" on the screen, for each of the | |
310 | Exim tests within the script. There may also be comments from some tests when a | |
311 | delay is expected, for example, if there is a "sleep" while testing a timeout. | |
312 | ||
313 | Before each set of optional tests, an extra identifying line is output. For | |
314 | example: | |
315 | ||
316 | >>> The following tests require: authenticator cram_md5 | |
317 | CRAM-MD5/2500 CRAM-MD5 server tests | |
318 | Script completed | |
319 | CRAM-MD5/2501 CRAM-MD5 client tests | |
320 | Script completed | |
321 | ||
322 | If a test fails, you are shown the output of the text comparison that failed, | |
323 | and prompted as to what to do next. The output is shown using the "less" | |
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324 | command, or "more" if "less" is not available. The options for "less" are set |
325 | to that it automatically exits if there is less that a screenful of output. By | |
326 | default, the output is from the "cf" program, and might look like this: | |
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327 | |
328 | DBM/1300 DBM files and exim_dbmbuild | |
329 | =============== | |
330 | Lines 7-9 of "test-stdout-munged" do not match lines 7-11 of "stdout/1300". | |
331 | ---------- | |
332 | exim_dbmbuild exit code = 1 | |
333 | Continued set of lines is too long: max permitted length is 99999 | |
334 | exim_dbmbuild exit code = 1 | |
335 | ---------- | |
336 | dbmbuild abandoned | |
337 | exim_dbmbuild exit code = 2 | |
338 | Continued set of lines is too long: max permitted length is 99999 | |
339 | dbmbuild abandoned | |
340 | exim_dbmbuild exit code = 2 | |
341 | =============== | |
342 | 1 difference found. | |
343 | "test-stdout-munged" contains 16 lines; "stdout/1300" contains 18 lines. | |
344 | ||
345 | Continue, Update & retry, Quit? [Q] | |
346 | ||
347 | This example was generated by running the test with a version of Exim | |
348 | that had a bug in the exim_dbmbuild utility (the bug was fixed at release | |
349 | 4.53). See "How the tests work" below for a description of the files that are | |
350 | used. In this case, the standard output differed from what was expected. | |
351 | ||
352 | The reply to the prompt must either be empty, in which case it takes the | |
353 | default that is given in brackets (in this case Q), or a single letter, in | |
354 | upper or lower case (in this case, one of C, U, or Q). If you type anything | |
355 | else, the prompt is repeated. | |
356 | ||
357 | "Continue" carries on as if the files had matched; that is, it ignores the | |
358 | mismatch. Any other output files for the same test will be compared before | |
359 | moving on to the next test. | |
360 | ||
361 | "Update & retry" copies the new file to the saved file, and reruns the test | |
362 | after doing any further comparisons that may be necessary. | |
363 | ||
364 | Other circumstances give rise to other prompts. If a test generates output for | |
365 | which there is no saved data, the prompt (after a message stating which file is | |
366 | unexpectely not empty) is: | |
367 | ||
368 | Continue, Show, or Quit? [Q] | |
369 | ||
370 | "Show" displays the data on the screen, and then you get the "Continue..." | |
371 | prompt. If a test ends with an unexpected return code, the prompt is: | |
372 | ||
373 | show stdErr, show stdOut, Continue (without file comparison), or Quit? [Q] | |
374 | ||
375 | Typically in these cases there will be something interesting in the stderr | |
376 | or stdout output. There is a similar prompt after the "server" auxiliary | |
377 | program fails. | |
378 | ||
379 | ||
380 | OPENSSL AND GNUTLS ERROR MESSAGES | |
381 | --------------------------------- | |
382 | ||
383 | Some of the TLS tests deliberately cause errors to check how Exim handles them. | |
384 | It has been observed that different releases of the OpenSSL and GnuTLS | |
385 | libraries generate different error messages. This may cause the comparison with | |
386 | the saved output to fail. Such errors can be ignored. | |
387 | ||
388 | ||
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389 | OTHER ISSUES |
390 | ------------ | |
391 | ||
392 | . Some of the tests are time-sensitive (e.g. when testing timeouts, as in test | |
393 | 461). These may fail if run on a host that is also running a lot of other | |
394 | processes. | |
395 | ||
396 | . Some versions of "ls" use a different format for times and dates. This can | |
397 | cause test 345 to fail. | |
398 | ||
399 | . Test 0142 tests open file descriptors; on some hosts the output may vary. | |
400 | ||
401 | ||
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402 | OTHER SCRIPTS AND PROGRAMS |
403 | -------------------------- | |
404 | ||
405 | There is a freestanding Perl script called "listtests" that scans the test | |
406 | scripts and outputs a list of all the tests, with a short descriptive comment | |
407 | for each one. Special requirements for groups of tests are also noted. | |
408 | ||
409 | The main runtest script makes use of a second Perl script and some compiled C | |
410 | programs. These are: | |
411 | ||
412 | patchexim A Perl script that makes a patched version of Exim (see the | |
413 | next section for details). | |
414 | ||
415 | bin/cf A text comparison program (see above). | |
416 | ||
417 | bin/checkaccess A program that is run as root; it changes uid/gid to the | |
418 | Exim user and group, and then checks that it can access | |
419 | files in the test suite's directory. | |
420 | ||
421 | bin/client A script-driven SMTP client simulation. | |
422 | ||
423 | bin/client-gnutls A script-driven SMTP client simulation with GnuTLS support. | |
424 | This is built only if GnuTLS support is detected on the host. | |
425 | ||
426 | bin/client-ssl A script-driven SMTP client simulation with OpenSSL support. | |
427 | This is built only if OpenSSL support is detected on the | |
428 | host. | |
429 | ||
430 | bin/fakens A fake "nameserver" for DNS tests (see below for details). | |
431 | ||
432 | bin/fd A program that outputs details of open file descriptors. | |
433 | ||
434 | bin/iefbr14 A program that does nothing, and returns 0. It's just like | |
435 | the "true" command, but it is in a known place. | |
436 | ||
437 | bin/loaded Some dynamically loaded functions for testing dlfunc support. | |
438 | ||
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439 | bin/mtpscript A script-driven SMTP/LMTP server simulation, on std{in,out}. |
440 | ||
441 | bin/server A script-driven SMTP server simulation, over a socket. | |
442 | ||
443 | bin/showids Output the current uid, gid, euid, egid. | |
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444 | |
445 | The runtest script also makes use of a number of ordinary commands such as | |
446 | "cp", "kill", "more", and "rm", via the system() call. In some cases these are | |
447 | run as root by means of sudo. | |
448 | ||
449 | ||
450 | STANDARD SUBSTITUTIONS | |
451 | ---------------------- | |
452 | ||
453 | In the following sections, there are several references to the "standard | |
454 | substitutions". These make changes to some of the stored files when they are | |
455 | used in a test. To save repetition, the substitutions themselves are documented | |
456 | here: | |
457 | ||
458 | CALLER is replaced by the login name of the user running the tests | |
1b781f48 | 459 | CALLERGROUP is replaced by the caller's group id |
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460 | CALLER_GID is replaced by the caller's group id |
461 | CALLER_UID is replaced by the caller's user id | |
462 | DIR is replaced by the name of the test-suite directory | |
463 | EXIMGROUP is replaced by the name of the Exim group | |
464 | EXIMUSER is replaced by the name of the Exim user | |
465 | HOSTIPV4 is replaced by the local host's IPv4 address | |
466 | HOSTIPV6 is replaced by the local host's IPv6 address | |
467 | HOSTNAME is replaced by the local host's name | |
468 | PORT_D is replaced by a port number for normal daemon use | |
469 | PORT_N is replaced by a port number that should never respond | |
470 | PORT_S is replaced by a port number for normal bin/server use | |
471 | TESTNUM is replaced by the current test number | |
472 | V4NET is replaced by an IPv4 network number for testing | |
473 | V6NET is replaced by an IPv6 network number for testing | |
474 | ||
475 | PORT_D is currently hard-wired to 1225, PORT_N to 1223, and PORT_S to 1224. | |
476 | V4NET is hardwired to 224 and V6NET to ff00. These networks are used for DNS | |
477 | testing purposes, and for testing Exim with -bh. The only requirement is that | |
478 | they are networks that can never be used for an IP address of a real host. I've | |
479 | chosen two multicast networks for the moment. | |
480 | ||
481 | If the host has no IPv6 address, "<no IPv6 address found>" is substituted but | |
482 | that does not matter because no IPv6 tests will be run. A similar substitution | |
483 | is made if there is no IPv4 address, and again, tests that actually require a | |
484 | running IPv4 interface should be skipped. | |
485 | ||
486 | If the host has more than one IPv4 or IPv6 address, the first one that | |
487 | "ifconfig" lists is used. If the only available address is 127.0.0.1 (or ::1 | |
1b781f48 | 488 | for IPv6) it is used, but another value is preferred if available. |
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489 | |
490 | In situations where a specific test is not being run (for example, when setting | |
491 | up dynamic data files), TESTNUM is replaced by an empty string, but should not | |
492 | in fact occur in such files. | |
493 | ||
494 | ||
495 | HOW THE TESTS WORK | |
496 | ------------------ | |
497 | ||
498 | Each numbered script runs Exim (sometimes several times) with its own Exim | |
499 | configuration file. The configurations are stored in the "confs" directory, | |
500 | and before running each test, a copy of the appropriate configuration, with the | |
501 | standard substitutions, is made in the file test-config. The -C command line | |
502 | option is used to tell Exim to use this configuration. | |
503 | ||
504 | The -D option is used to pass the path of the Exim binary to the configuration. | |
505 | This is not standardly substituted, because there are two possible binaries | |
506 | that might be used in the same test (one setuid to root, the other to the exim | |
507 | user). Some tests also make use of -D to vary the configuration for different | |
508 | calls to the Exim binary. | |
509 | ||
510 | Normally, of course, Exim gives up root privilege when -C and -D are used by | |
511 | unprivileged users. We do not want this to happen when running the tests, | |
512 | because we want to be able to test all aspects of Exim, including receiving | |
513 | mail from unprivileged users. The way this is handled is as follows: | |
514 | ||
515 | At the start of the runtest script, the patchexim script is run as root. This | |
516 | script makes a copy of the Exim binary that is to be tested, patching it as it | |
517 | does so. (This is a binary patch, not a source patch.) The patch causes the | |
518 | binary, when run, to "know" that it is running in the test harness. It does not | |
519 | give up root privilege when -C and -D are used, and in a few places it takes | |
520 | other special actions, such as delaying when starting a subprocess to allow | |
521 | debug output from the parent to be written first. If you want to know more, | |
522 | grep the Exim source files for "running_in_test_harness". | |
523 | ||
524 | The patched binary is placed in the directory eximdir/exim and given the normal | |
525 | setuid root privilege. This is, of course, a dangerous binary to have lying | |
526 | around, especially if there are unprivileged users on the system. To protect | |
527 | it, the eximdir directory is created with the current user as owner, exim as | |
528 | the group owner, and with access drwx--x---. Thus, only the user who is running | |
529 | the tests (who is known to have access to root) and the exim user have access | |
530 | to the modified Exim binary. When runtest terminates, the patched binary is | |
531 | removed. | |
532 | ||
533 | Each set of tests proceeds by interpreting its controlling script. The scripts | |
534 | are in subdirectories of the "scripts" directory. They are split up according | |
535 | to the requirements of the tests they contain, with the 0000-Basic directory | |
536 | containing tests that can always be run. Run the "listtests" script to obtain a | |
537 | list of tests. | |
538 | ||
539 | ||
540 | TEST OUTPUT | |
541 | ----------- | |
542 | ||
543 | Output from script runs is written to the files test-stdout and test-stderr. | |
544 | When an Exim server is involved, test-stdout-server and test-stderr-server are | |
545 | used for its output. Before being compared with the saved output, the | |
546 | non-server and server files are concatenated, so a single saved file contains | |
547 | both. | |
548 | ||
549 | A directory called spool is used for Exim's spool files, and for Exim logs. | |
550 | These locations are specified in every test's configuration file. | |
551 | ||
552 | When messages are delivered to files, the files are put in the test-mail | |
553 | directory. Output from comparisons is written to test-cf. | |
554 | ||
555 | Before comparisons are done, output texts are modified ("munged") to change or | |
556 | remove parts that are expected to vary from run to run. The modified files all | |
557 | end with the suffix "-munged". Thus, you will see test-stdout-munged, | |
558 | test-mainlog-munged, test-mail-munged, and so on. Other files whose names start | |
559 | with "test-" are created and used by some of the tests. | |
560 | ||
561 | At the end of a successful test run, the spool directory and all the files | |
562 | whose names begin with "test-" are removed. If the run ends unsuccessfully | |
563 | (typically after a "Q" response to a prompt), the spool and test files are left | |
564 | in existence so that the problem can be investigated. | |
565 | ||
566 | ||
567 | TEST COMMANDS | |
568 | ------------- | |
569 | ||
570 | Each test script consists of a list of commands, each optionally preceded by | |
571 | comments (lines starting with #) and (also optionally) a line containing an | |
572 | expected return code. Some of the commands are followed by data lines | |
573 | terminated by a line of four asterisks. | |
574 | ||
575 | The first line of each script must be a comment that briefly describes the | |
576 | script. For example: | |
577 | ||
578 | # -bS Use of HELO/RSET | |
579 | ||
580 | A line consisting just of digits is interpreted as the expected return code | |
581 | for the command that follows. The default expectation when no such line exists | |
582 | is a zero return code. For example, here is a complete test script, containing | |
583 | just one command: | |
584 | ||
585 | # -bS Unexpected EOF in headers | |
586 | 1 | |
587 | exim -bS -odi | |
588 | mail from:<someone@some.where> | |
589 | rcpt to:<blackhole@HOSTNAME> | |
590 | data | |
591 | from: me | |
592 | **** | |
593 | ||
594 | The expected return code in this case is 1, and the data lines are passed to | |
595 | Exim on its standard input. Both the command line and the data lines have the | |
596 | standard substitions applied to them. Thus, HOSTNAME in the example above will | |
597 | be replaced by the local host's name. Long commands can be continued over | |
598 | several lines by using \ as a continuation character. This does *not* apply to | |
599 | data lines. | |
600 | ||
1b781f48 | 601 | Here follows a list of supported commands. They can be divided into two groups: |
151b83f8 PH |
602 | |
603 | ||
604 | Commands with no input | |
605 | ---------------------- | |
606 | ||
607 | These commands are not followed by any input data, or by a line of asterisks. | |
608 | ||
cfc54830 | 609 | |
151b83f8 PH |
610 | dbmbuild <file1> <file1> |
611 | ||
612 | This command runs the exim_dbmbuild utility to build a DBM file. It is used | |
613 | only when DBM support is available in Exim, and typically follows the use of a | |
614 | "write" command (see below) that creates the input file. | |
615 | ||
616 | ||
cfc54830 PH |
617 | dumpdb <dbname> |
618 | ||
619 | This command runs the exim_dumpdb utility on the testing spool directory, using | |
620 | the database name given, for example: "dumpdb retry". | |
621 | ||
622 | ||
151b83f8 PH |
623 | echo <text> |
624 | ||
625 | The text is written to the screen; this is used to output comments from | |
626 | scripts. | |
627 | ||
628 | ||
cfc54830 PH |
629 | exim_lock [options] <file name> |
630 | ||
631 | This command runs the exim_lock utility with the given options and file name. | |
632 | The file remains locked with the following command (normally exim) is obeyed. | |
633 | ||
634 | ||
635 | exinext <data> | |
636 | ||
637 | This command runs the exinext utility with the given argument data. | |
638 | ||
639 | ||
f3f065bb PH |
640 | exigrep <data> |
641 | ||
642 | This command runs the exigrep utility with the given data (the search pattern) | |
643 | on the current mainlog file. | |
644 | ||
645 | ||
151b83f8 PH |
646 | gnutls |
647 | ||
648 | This command is present at the start of all but one of the tests that use | |
649 | GnuTLS. It copies a pre-existing parameter file into the spool directory, so | |
650 | that Exim does not have to re-create the file each time. The first GnuTLS test | |
cfc54830 | 651 | does not do this, in order to test that Exim can create the file. |
151b83f8 PH |
652 | |
653 | ||
654 | killdaemon | |
655 | ||
656 | This command must be given in any script that starts an Exim daemon, normally | |
657 | at the end. It searches for the PID file in the spool directory, and sends a | |
658 | SIGINT signal to the Exim daemon process whose PID it finds. See below for | |
659 | comments about starting Exim daemons. | |
660 | ||
661 | ||
662 | millisleep <m> | |
663 | ||
664 | This command causes the script to sleep for m milliseconds. Nothing is output | |
665 | to the screen. | |
666 | ||
667 | ||
668 | need_ipv4 | |
669 | ||
670 | This command must be at the head of a script. If no IPv4 interface has been | |
671 | found, the entire script is skipped, and a comment is output. | |
672 | ||
673 | ||
674 | need_ipv6 | |
675 | ||
676 | This command must be at the head of a script. If no IPv6 interface has been | |
677 | found, the entire script is skipped, and a comment is output. | |
678 | ||
679 | ||
21c28500 PH |
680 | need_largefiles |
681 | ||
682 | This command must be at the head of a script. If the Exim binary does not | |
683 | suppport large files (off_t is <= 4), the entire script is skipped, and a | |
684 | comment is output. | |
685 | ||
686 | ||
151b83f8 PH |
687 | need_move_frozen_messages |
688 | ||
689 | This command must be at the head of a script. If the Exim binary does not have | |
690 | support for moving frozen messages (which is an optional feature), the entire | |
691 | script is skipped, and a comment is output. | |
692 | ||
693 | ||
694 | no_message_check | |
695 | ||
696 | If this command is encountered anywhere in the script, messages that are | |
697 | delivered when the script runs are not compared with saved versions. | |
698 | ||
699 | ||
700 | no_msglog_check | |
701 | ||
702 | If this command is encountered anywhere in the script, message log files that | |
703 | are still in existence at the end of the run (for messages that were not | |
704 | delivered) are not compared with saved versions. | |
705 | ||
cfc54830 | 706 | |
151b83f8 PH |
707 | no_stderr_check |
708 | ||
709 | If this command is encountered anywhere in the script, the stderr output from | |
710 | the run is not compared with a saved version. | |
711 | ||
712 | ||
713 | no_stdout_check | |
714 | ||
715 | If this command is encountered anywhere in the script, the stdout output from | |
716 | the run is not compared with a saved version. | |
717 | ||
718 | ||
719 | rmfiltertest | |
720 | ||
721 | This command indicates that the script is for a certain type of filter test, in | |
722 | which there are a lot of repetitive stdout lines that get in the way, because | |
723 | filter tests output data about the sender and recipient. Such lines are removed | |
724 | from the stdout output before comparing, for ease of human perusal. | |
725 | ||
726 | ||
727 | sleep <n> | |
728 | ||
729 | This command causes the script to sleep for n seconds. If n is greater than | |
730 | one, "sleep <n>" is output to the screen, followed by a dot for every second | |
731 | that passes. | |
732 | ||
733 | ||
734 | sortlog | |
735 | ||
736 | This command causes special sorting to occur on the mainlog file before | |
737 | comparison. Every sequence of contiguous delivery lines (lines containing the | |
738 | => -> or *> flags) is sorted. This is necessary in some tests that use parallel | |
739 | deliveries because on different systems the processes may terminate in a | |
740 | different order. | |
741 | ||
742 | ||
cfc54830 PH |
743 | A number of standard file management commands are also recognized. These are |
744 | cat, chmod, chown, cp, du, ln, ls, du, mkdir, mkfifo, rm, rmdir, and touch. | |
745 | Some are run as root using "sudo". | |
151b83f8 PH |
746 | |
747 | ||
748 | Commands with input | |
749 | ------------------- | |
750 | ||
751 | The remaining commands are followed by data lines for their standard input, | |
752 | terminated by four asterisks. Even if no data is required for the particular | |
753 | usage, the asterisks must be given. | |
754 | ||
755 | ||
756 | catwrite <file name> [nxm[=start-of-line-text]]* | |
757 | ||
758 | This command operates like the "write" command, which is described below, | |
1b781f48 | 759 | except that the data it generates is copied to the end of the test-stdout file |
151b83f8 PH |
760 | as well as to the named file. |
761 | ||
762 | ||
763 | ||
764 | client [<options>] <ip address> <port> [<outgoing interface>] | |
765 | ||
766 | This command runs the auxiliary "client" program that simulates an SMTP client. | |
767 | It is controlled by a script read from its standard input, details of which are | |
a14e5636 PH |
768 | given below. There are two options. One is -t, which must be followed directly |
769 | by a number, to specify the command timeout in seconds (e.g. -t5). The default | |
770 | timeout is 1 second. The other option is -tls-on-connect, which causes the | |
771 | client to try to start up a TLS session as soon as it has connected, without | |
772 | using the STARTTLS command. The client program connects to the given IP address | |
773 | and port, using the specified interface, if one is given. | |
151b83f8 PH |
774 | |
775 | ||
776 | client-ssl [<options>] <ip address> <port> [<outgoing interface>] \ | |
777 | [<cert file>] [<key file>] | |
778 | ||
779 | When OpenSSL is available on the host, an alternative version of the client | |
780 | program is compiled, one that supports TLS using OpenSSL. The additional | |
781 | arguments specify a certificate and key file when required. There is one | |
782 | additional option, -tls-on-connect, that causes the client to initiate TLS | |
783 | negotiation immediately on connection. | |
784 | ||
785 | ||
786 | client-gnutls [<options>] <ip address> <port> [<outgoing interface>] \ | |
787 | [<cert file>] [<key file>] | |
788 | ||
789 | When GnuTLS is available on the host, an alternative version of the client | |
790 | program is compiled, one that supports TLS using GnuTLS. The additional | |
791 | arguments specify a certificate and key file when required. There is one | |
792 | additional option, -tls-on-connect, that causes the client to initiate TLS | |
793 | negotiation immediately on connection. | |
794 | ||
795 | ||
796 | exim [<options>] [<arguments>] | |
797 | ||
798 | This command runs the testing version of Exim. Any occurrence of "$msg1" in the | |
799 | command line is replaced by the ID of the first (oldest) message in Exim's | |
800 | (testing) spool. "$msg2" refers to the second, and so on. The name "exim" can | |
801 | be preceded by an environment setting as in this example: | |
802 | ||
803 | LDAPTLS_REQCERT=never exim -be | |
804 | ||
805 | It can also be preceded by a number; this specifies a number of seconds to wait | |
806 | before closing the stdout pipe to Exim, and is used for some timeout tests. For | |
807 | example: | |
808 | ||
809 | 3 exim -bs | |
810 | ||
811 | Finally, "exim" can be preceded by "sudo", to run Exim as root. If more than | |
812 | one of these prefixes is present, they must be in the above order. | |
813 | ||
814 | ||
815 | exim_exim [<options>] [<arguments>] | |
816 | ||
817 | This runs an alternative version of Exim that is setuid to exim rather than to | |
818 | root. | |
819 | ||
820 | ||
821 | server [<options>] <port or socket> [<connection count>] | |
822 | ||
823 | This command runs the auxiliary "server" program that simulates an SMTP (or | |
824 | other) server. It is controlled by a script that is read from its standard | |
825 | input, details of which are given below. A number of options are implemented: | |
826 | ||
827 | -d causes the server to output debugging information | |
828 | ||
829 | -t sets a timeout in seconds (default 5) for when the server is | |
830 | awaiting an incoming connection | |
831 | ||
832 | -noipv4 causes the server not to set up an IPv4 socket | |
833 | ||
834 | -noipv6 causes the server not to set up an IPv6 socket | |
835 | ||
836 | By default, in an IPv6 environment, both kinds of socket are set up. However, | |
837 | the test script knows which interfaces actually exist on the host, and it adds | |
838 | -noipv4 or -noipv6 to the server command as required. An error occurs if both | |
839 | these options are given. | |
840 | ||
841 | The only required argument is either a port number or the path name of a Unix | |
842 | domain socket. The port is normally PORT_S, which is changed to an actual | |
843 | number by the standard substitutions. The optional final argument specifies the | |
844 | number of different connections to expect (default 1). These must happen | |
845 | serially (one at a time). There is no support for multiple simultaneous | |
846 | connections. Here are some example commands: | |
847 | ||
848 | server PORT_S | |
849 | server -t 10 PORT_S 3 | |
850 | server /tmp/somesocket | |
851 | ||
852 | The following lines, up to a line of four asterisks, are the server's | |
853 | controlling standard input (described below). These lines are read and | |
854 | remembered; during the following commands, until an "exim" command is reached, | |
855 | the server is run in parallel. | |
856 | ||
857 | ||
858 | write <file name> [nxm[=start-of-line-text]]* | |
859 | ||
860 | The "write" command is a way of creating files of specific sizes for buffering | |
861 | tests, or containing specific data lines. Being able to do this from within the | |
862 | script saves holding lots of little test files. The optional argument specifies | |
863 | n lines of length m. The lines consist of the letter "a". If start of line text | |
864 | is supplied, it replaces "a"s at the start of each line. Underscores in the | |
865 | start of line text are turned into spaces. The optional argument may be | |
866 | repeated. The data lines that follow a "write" command are split into two by a | |
867 | line of four plus signs. Any above the split are written before the | |
868 | fixed-length lines, and any below the split are written after. For example: | |
869 | ||
870 | write test-data 3x30=AB_ 1x50 | |
871 | Pre-data | |
872 | lines | |
873 | ++++ | |
874 | Post-data | |
875 | lines | |
876 | **** | |
877 | ||
878 | This command generates a file containing: | |
879 | ||
880 | Pre-data | |
881 | lines | |
882 | AB aaaaaaaaaaaaaaaaaaaaaaaaaaa | |
883 | AB aaaaaaaaaaaaaaaaaaaaaaaaaaa | |
884 | AB aaaaaaaaaaaaaaaaaaaaaaaaaaa | |
885 | aaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaa | |
886 | Post-data | |
887 | lines | |
888 | ||
889 | If there are no fixed-length line specifiers, there is no need to split the | |
890 | data, and a line of plusses is not needed. | |
891 | ||
892 | ||
893 | [sudo] perl | |
894 | ||
895 | This command runs Perl, with the data as its standard input, to allow arbitrary | |
896 | one-off things to be done. | |
897 | ||
898 | ||
899 | CLIENT SCRIPTS | |
900 | -------------- | |
901 | ||
902 | Lines in client scripts are of two kinds: | |
903 | ||
904 | (1) If a line begins with three question marks and a space, the rest of the | |
905 | line defines the start of expected output from the server. If what is | |
906 | received does not match, the client bombs out with an error message. | |
907 | ||
908 | (2) If a line starts with three plus signs followed by a space, the rest of the | |
909 | line specifies a number of seconds to sleep for before proceeding. | |
910 | ||
911 | (3) Otherwise, the line is an input line line that is sent to the server. Any | |
912 | occurrences of \r and \n in the line are turned into carriage return and | |
913 | linefeed, respectively. This is used for testing PIPELINING. | |
914 | ||
915 | Here is a simple example: | |
916 | ||
917 | client 127.0.0.1 PORT_D | |
918 | ??? 250 | |
919 | EHLO xxx | |
920 | ??? 250- | |
921 | ??? 250 | |
922 | AUTH PLAIN AbdXi0AdnD2CVy | |
923 | ??? 535 | |
924 | quit | |
925 | ??? 221 | |
926 | **** | |
927 | ||
928 | In the case of client-gnutls and client-ssl, if a command is "starttls", this | |
929 | is remembered, and after a subsequent OK response, an attempt to move into TLS | |
930 | mode occurs. If a command is "starttls_wait", the client sends "starttls" but | |
931 | does not start up TLS; this is for testing timeouts. If a command is "stoptls", | |
932 | an existing TLS connection is shut down, but nothing is sent. | |
933 | ||
934 | ||
935 | SERVER SCRIPTS | |
936 | -------------- | |
937 | ||
938 | The server program sleeps till a connection occurs or its timeout is reached, | |
939 | in which case it bombs out. The next set of command lines are interpreted. They | |
940 | are of the following kinds: | |
941 | ||
942 | (1) A line that starts with '>' or with a digit is an output line that is sent | |
943 | to the client. In the case of '>': | |
944 | ||
945 | (a) If the line starts with ">>", no terminating CRLF is sent. | |
946 | (b) If the line starts with ">CR>", just CR is sent at the end. | |
947 | (c) If the line starts with ">LF>", just LF is sent at the end. | |
948 | (d) If the line starts with ">*eof", nothing is sent and the connection | |
949 | is closed. | |
950 | ||
951 | The data that is sent starts after the initial '>' sequence. | |
952 | ||
953 | (2) A line that starts with "*sleep" specifies a number of seconds to wait | |
954 | before proceeding. | |
955 | ||
956 | (3) A line containing "*eof" specifies that the client is expected to close | |
957 | the connection at this point. | |
958 | ||
959 | (4) A line containing just '.' specifies that the client is expected to send | |
960 | many lines, terminated by one that contains just a dot. | |
961 | ||
962 | (5) Otherwise, the line defines the start of an input line that the client | |
963 | is expected to send. To allow for lines that start with digits, the line | |
964 | may start with '<', which is not taken as part of the input data. If the | |
965 | input does not match, the server bombs out with an error message. | |
966 | ||
bbe15da8 | 967 | Here is a simple example of server use in a test script: |
151b83f8 PH |
968 | |
969 | server PORT_S | |
970 | 220 Greetings | |
971 | EHLO | |
972 | 250 Hello there | |
973 | MAIL FROM | |
974 | 250 OK | |
975 | RCPT TO | |
976 | 250 OK | |
977 | DATA | |
978 | 354 Send it! | |
979 | . | |
980 | 250 OK | |
981 | QUIT | |
982 | 225 OK | |
983 | **** | |
984 | ||
985 | After a "server" command in a test script, the server runs in parallel until an | |
986 | "exim" command is reached. The "exim" command attempts to deliver one or more | |
987 | messages to port PORT_S on the local host. When it has finished, the test | |
988 | script waits for the "server" process to finish. | |
989 | ||
bbe15da8 PH |
990 | The "mtpscript" program is like "server", except that it uses stdin/stdout for |
991 | its input and output instead of a script. However, it is not called from test | |
992 | scripts; instead it is used as the command for pipe transports in some | |
993 | configurations, to simulate non-socket LMTP servers. | |
994 | ||
151b83f8 PH |
995 | |
996 | AUXILIARY DATA FILES | |
997 | -------------------- | |
998 | ||
999 | Many of the tests make use of auxiliary data files. There are two types; those | |
1000 | whose content is fixed, and those whose content needs to be varied according to | |
1001 | the current environment. The former are kept in the directory aux-fixed. The | |
1002 | latter are distributed in the directory aux-var-src, and copied with the | |
1003 | standard substitutions into the directory aux-var at the start of each test | |
1004 | run. | |
1005 | ||
1006 | Most of the auxiliary files have names that start with a test number, | |
1007 | indicating that they are specific to that one test. A few fixed files (for | |
1008 | example, some TLS certificates) are used by more than one test, and so their | |
1009 | names are not of this form. | |
1010 | ||
1011 | There are also some auxilary DNS zone files, which are described in the next | |
1012 | section. | |
1013 | ||
1014 | ||
1015 | DNS LOOKUPS AND GETHOSTBYNAME | |
1016 | ----------------------------- | |
1017 | ||
1018 | The original test suite required special testing zones to be loaded into a | |
1019 | local nameserver. This is no longer a requirement for the new suite. Instead, a | |
1020 | program called fakens is used to simulate a nameserver. When Exim is running in | |
1021 | the test harness, instead of calling res_search() - the normal call to the DNS | |
1022 | resolver - it calls a testing function. This handles a few special names itself | |
1023 | (for compatibility with the old test suite), but otherwise passes the query to | |
1024 | the fakens program. | |
1025 | ||
1026 | The fakens program consults "zone files" in the directory called dnszones, and | |
1027 | returns data in the standard resource record format for Exim to process as if | |
1028 | it came from the DNS. However, if the requested domain is not in any of the | |
1029 | zones that fakens knows about, it returns a special code that causes Exim to | |
1030 | pass the query on to res_search(). The zone files are: | |
1031 | ||
1032 | db.test.ex A zone for the domain test.ex. | |
1033 | db.ip4.10 A zone for one special case in 10.250.0.0/16 (see below) | |
1034 | db.ip4.V4NET A zone for the domain V4NET.in-addr.arpa. | |
1035 | db.ip4.127 A zone for the domain 127.in-addr.arpa. | |
1036 | db.ip6.V6NET A zone for the domain inverted(V6NET).ip6.arpa. | |
1037 | db.ip6.0 A zone for the domain 0.ip6.arpa. | |
1038 | ||
1039 | V4NET and V6NET are substituted with the current testing networks (see above). | |
1040 | In the case of V6NET, the network is four hex digits, and it is split and | |
1041 | inverted appropriately when setting up the zone. | |
1042 | ||
1043 | These fake zone files are built dynamically from sources in the dnszones-src | |
1044 | directory by applying the standard substitutions. The test suite also builds | |
1045 | dynamic zone files for the name of the current host and its IP address(es). The | |
1046 | idea is that there should not be any need to rely on an external DNS. | |
1047 | ||
1048 | The domain names that are handled directly by Exim, without being passed to | |
1049 | fakens, are: | |
1050 | ||
1051 | test.again.dns This always provokes a TRY_AGAIN response, for testing the | |
1052 | handling of temporary DNS error. If the full domain name | |
1053 | starts with digits, a delay of that many seconds occurs. | |
1054 | ||
1055 | test.fail.dns This always provokes a NO_RECOVERY response, for testing | |
1056 | DNS server failures. | |
1057 | ||
1058 | This special handling could now be done in the fakens program, but while the | |
1059 | old test suite is still being used it has to be done in Exim itself, so for the | |
1060 | moment it remains there. | |
1061 | ||
1062 | The use of gethostbyname() and its IPv6 friends is also subverted when Exim is | |
1063 | running in the test harness. The test code handles a few special names | |
1064 | directly; for all the others it uses DNS lookups, which are then handled as | |
1065 | just described. Thus, the use of /etc/hosts is completely bypassed. The names | |
1066 | that are specially handled are: | |
1067 | ||
1068 | manyhome.test.ex This name is used for testing hosts with ridiculously large | |
1069 | numbers of IP addresses; 2048 IP addresses are generated | |
1070 | and returned. Doing it this way saves having to make the | |
1071 | interface to fakens handle more records that can fit in the | |
1072 | data block. The addresses that are generated are in the | |
1073 | 10.250.0.0/16 network. | |
1074 | ||
1075 | localhost Always returns 127.0.0.1 or ::1, for IPv4 and IPv6 lookups, | |
1076 | respectively. | |
1077 | ||
1078 | <an IP address> If the IP address is of the correct form for the lookup | |
1079 | type (IPv4 or IPv6), it is returned. Otherwise a panic-die | |
1080 | error occurs. | |
1081 | ||
1082 | The reverse zone db.ip4.10 is provided just for the manyhome.test.ex case. It | |
1083 | contains a single wildcard resource record. It also contains the line | |
1084 | ||
1085 | PASS ON NOT FOUND | |
1086 | ||
1087 | Whenever fakens finds this line in a zone file, it returns PASS_ON instead of | |
1088 | HOST_NOT_FOUND. This causes Exim to pass the query to res_search(). | |
1089 | ||
1090 | **** |