summaryrefslogtreecommitdiffstats
path: root/src/cleanup/cleanup_milter.c
blob: 491de25302d90f40523cc31a62cf0f285735ba4d (plain)
1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38
39
40
41
42
43
44
45
46
47
48
49
50
51
52
53
54
55
56
57
58
59
60
61
62
63
64
65
66
67
68
69
70
71
72
73
74
75
76
77
78
79
80
81
82
83
84
85
86
87
88
89
90
91
92
93
94
95
96
97
98
99
100
101
102
103
104
105
106
107
108
109
110
111
112
113
114
115
116
117
118
119
120
121
122
123
124
125
126
127
128
129
130
131
132
133
134
135
136
137
138
139
140
141
142
143
144
145
146
147
148
149
150
151
152
153
154
155
156
157
158
159
160
161
162
163
164
165
166
167
168
169
170
171
172
173
174
175
176
177
178
179
180
181
182
183
184
185
186
187
188
189
190
191
192
193
194
195
196
197
198
199
200
201
202
203
204
205
206
207
208
209
210
211
212
213
214
215
216
217
218
219
220
221
222
223
224
225
226
227
228
229
230
231
232
233
234
235
236
237
238
239
240
241
242
243
244
245
246
247
248
249
250
251
252
253
254
255
256
257
258
259
260
261
262
263
264
265
266
267
268
269
270
271
272
273
274
275
276
277
278
279
280
281
282
283
284
285
286
287
288
289
290
291
292
293
294
295
296
297
298
299
300
301
302
303
304
305
306
307
308
309
310
311
312
313
314
315
316
317
318
319
320
321
322
323
324
325
326
327
328
329
330
331
332
333
334
335
336
337
338
339
340
341
342
343
344
345
346
347
348
349
350
351
352
353
354
355
356
357
358
359
360
361
362
363
364
365
366
367
368
369
370
371
372
373
374
375
376
377
378
379
380
381
382
383
384
385
386
387
388
389
390
391
392
393
394
395
396
397
398
399
400
401
402
403
404
405
406
407
408
409
410
411
412
413
414
415
416
417
418
419
420
421
422
423
424
425
426
427
428
429
430
431
432
433
434
435
436
437
438
439
440
441
442
443
444
445
446
447
448
449
450
451
452
453
454
455
456
457
458
459
460
461
462
463
464
465
466
467
468
469
470
471
472
473
474
475
476
477
478
479
480
481
482
483
484
485
486
487
488
489
490
491
492
493
494
495
496
497
498
499
500
501
502
503
504
505
506
507
508
509
510
511
512
513
514
515
516
517
518
519
520
521
522
523
524
525
526
527
528
529
530
531
532
533
534
535
536
537
538
539
540
541
542
543
544
545
546
547
548
549
550
551
552
553
554
555
556
557
558
559
560
561
562
563
564
565
566
567
568
569
570
571
572
573
574
575
576
577
578
579
580
581
582
583
584
585
586
587
588
589
590
591
592
593
594
595
596
597
598
599
600
601
602
603
604
605
606
607
608
609
610
611
612
613
614
615
616
617
618
619
620
621
622
623
624
625
626
627
628
629
630
631
632
633
634
635
636
637
638
639
640
641
642
643
644
645
646
647
648
649
650
651
652
653
654
655
656
657
658
659
660
661
662
663
664
665
666
667
668
669
670
671
672
673
674
675
676
677
678
679
680
681
682
683
684
685
686
687
688
689
690
691
692
693
694
695
696
697
698
699
700
701
702
703
704
705
706
707
708
709
710
711
712
713
714
715
716
717
718
719
720
721
722
723
724
725
726
727
728
729
730
731
732
733
734
735
736
737
738
739
740
741
742
743
744
745
746
747
748
749
750
751
752
753
754
755
756
757
758
759
760
761
762
763
764
765
766
767
768
769
770
771
772
773
774
775
776
777
778
779
780
781
782
783
784
785
786
787
788
789
790
791
792
793
794
795
796
797
798
799
800
801
802
803
804
805
806
807
808
809
810
811
812
813
814
815
816
817
818
819
820
821
822
823
824
825
826
827
828
829
830
831
832
833
834
835
836
837
838
839
840
841
842
843
844
845
846
847
848
849
850
851
852
853
854
855
856
857
858
859
860
861
862
863
864
865
866
867
868
869
870
871
872
873
874
875
876
877
878
879
880
881
882
883
884
885
886
887
888
889
890
891
892
893
894
895
896
897
898
899
900
901
902
903
904
905
906
907
908
909
910
911
912
913
914
915
916
917
918
919
920
921
922
923
924
925
926
927
928
929
930
931
932
933
934
935
936
937
938
939
940
941
942
943
944
945
946
947
948
949
950
951
952
953
954
955
956
957
958
959
960
961
962
963
964
965
966
967
968
969
970
971
972
973
974
975
976
977
978
979
980
981
982
983
984
985
986
987
988
989
990
991
992
993
994
995
996
997
998
999
1000
1001
1002
1003
1004
1005
1006
1007
1008
1009
1010
1011
1012
1013
1014
1015
1016
1017
1018
1019
1020
1021
1022
1023
1024
1025
1026
1027
1028
1029
1030
1031
1032
1033
1034
1035
1036
1037
1038
1039
1040
1041
1042
1043
1044
1045
1046
1047
1048
1049
1050
1051
1052
1053
1054
1055
1056
1057
1058
1059
1060
1061
1062
1063
1064
1065
1066
1067
1068
1069
1070
1071
1072
1073
1074
1075
1076
1077
1078
1079
1080
1081
1082
1083
1084
1085
1086
1087
1088
1089
1090
1091
1092
1093
1094
1095
1096
1097
1098
1099
1100
1101
1102
1103
1104
1105
1106
1107
1108
1109
1110
1111
1112
1113
1114
1115
1116
1117
1118
1119
1120
1121
1122
1123
1124
1125
1126
1127
1128
1129
1130
1131
1132
1133
1134
1135
1136
1137
1138
1139
1140
1141
1142
1143
1144
1145
1146
1147
1148
1149
1150
1151
1152
1153
1154
1155
1156
1157
1158
1159
1160
1161
1162
1163
1164
1165
1166
1167
1168
1169
1170
1171
1172
1173
1174
1175
1176
1177
1178
1179
1180
1181
1182
1183
1184
1185
1186
1187
1188
1189
1190
1191
1192
1193
1194
1195
1196
1197
1198
1199
1200
1201
1202
1203
1204
1205
1206
1207
1208
1209
1210
1211
1212
1213
1214
1215
1216
1217
1218
1219
1220
1221
1222
1223
1224
1225
1226
1227
1228
1229
1230
1231
1232
1233
1234
1235
1236
1237
1238
1239
1240
1241
1242
1243
1244
1245
1246
1247
1248
1249
1250
1251
1252
1253
1254
1255
1256
1257
1258
1259
1260
1261
1262
1263
1264
1265
1266
1267
1268
1269
1270
1271
1272
1273
1274
1275
1276
1277
1278
1279
1280
1281
1282
1283
1284
1285
1286
1287
1288
1289
1290
1291
1292
1293
1294
1295
1296
1297
1298
1299
1300
1301
1302
1303
1304
1305
1306
1307
1308
1309
1310
1311
1312
1313
1314
1315
1316
1317
1318
1319
1320
1321
1322
1323
1324
1325
1326
1327
1328
1329
1330
1331
1332
1333
1334
1335
1336
1337
1338
1339
1340
1341
1342
1343
1344
1345
1346
1347
1348
1349
1350
1351
1352
1353
1354
1355
1356
1357
1358
1359
1360
1361
1362
1363
1364
1365
1366
1367
1368
1369
1370
1371
1372
1373
1374
1375
1376
1377
1378
1379
1380
1381
1382
1383
1384
1385
1386
1387
1388
1389
1390
1391
1392
1393
1394
1395
1396
1397
1398
1399
1400
1401
1402
1403
1404
1405
1406
1407
1408
1409
1410
1411
1412
1413
1414
1415
1416
1417
1418
1419
1420
1421
1422
1423
1424
1425
1426
1427
1428
1429
1430
1431
1432
1433
1434
1435
1436
1437
1438
1439
1440
1441
1442
1443
1444
1445
1446
1447
1448
1449
1450
1451
1452
1453
1454
1455
1456
1457
1458
1459
1460
1461
1462
1463
1464
1465
1466
1467
1468
1469
1470
1471
1472
1473
1474
1475
1476
1477
1478
1479
1480
1481
1482
1483
1484
1485
1486
1487
1488
1489
1490
1491
1492
1493
1494
1495
1496
1497
1498
1499
1500
1501
1502
1503
1504
1505
1506
1507
1508
1509
1510
1511
1512
1513
1514
1515
1516
1517
1518
1519
1520
1521
1522
1523
1524
1525
1526
1527
1528
1529
1530
1531
1532
1533
1534
1535
1536
1537
1538
1539
1540
1541
1542
1543
1544
1545
1546
1547
1548
1549
1550
1551
1552
1553
1554
1555
1556
1557
1558
1559
1560
1561
1562
1563
1564
1565
1566
1567
1568
1569
1570
1571
1572
1573
1574
1575
1576
1577
1578
1579
1580
1581
1582
1583
1584
1585
1586
1587
1588
1589
1590
1591
1592
1593
1594
1595
1596
1597
1598
1599
1600
1601
1602
1603
1604
1605
1606
1607
1608
1609
1610
1611
1612
1613
1614
1615
1616
1617
1618
1619
1620
1621
1622
1623
1624
1625
1626
1627
1628
1629
1630
1631
1632
1633
1634
1635
1636
1637
1638
1639
1640
1641
1642
1643
1644
1645
1646
1647
1648
1649
1650
1651
1652
1653
1654
1655
1656
1657
1658
1659
1660
1661
1662
1663
1664
1665
1666
1667
1668
1669
1670
1671
1672
1673
1674
1675
1676
1677
1678
1679
1680
1681
1682
1683
1684
1685
1686
1687
1688
1689
1690
1691
1692
1693
1694
1695
1696
1697
1698
1699
1700
1701
1702
1703
1704
1705
1706
1707
1708
1709
1710
1711
1712
1713
1714
1715
1716
1717
1718
1719
1720
1721
1722
1723
1724
1725
1726
1727
1728
1729
1730
1731
1732
1733
1734
1735
1736
1737
1738
1739
1740
1741
1742
1743
1744
1745
1746
1747
1748
1749
1750
1751
1752
1753
1754
1755
1756
1757
1758
1759
1760
1761
1762
1763
1764
1765
1766
1767
1768
1769
1770
1771
1772
1773
1774
1775
1776
1777
1778
1779
1780
1781
1782
1783
1784
1785
1786
1787
1788
1789
1790
1791
1792
1793
1794
1795
1796
1797
1798
1799
1800
1801
1802
1803
1804
1805
1806
1807
1808
1809
1810
1811
1812
1813
1814
1815
1816
1817
1818
1819
1820
1821
1822
1823
1824
1825
1826
1827
1828
1829
1830
1831
1832
1833
1834
1835
1836
1837
1838
1839
1840
1841
1842
1843
1844
1845
1846
1847
1848
1849
1850
1851
1852
1853
1854
1855
1856
1857
1858
1859
1860
1861
1862
1863
1864
1865
1866
1867
1868
1869
1870
1871
1872
1873
1874
1875
1876
1877
1878
1879
1880
1881
1882
1883
1884
1885
1886
1887
1888
1889
1890
1891
1892
1893
1894
1895
1896
1897
1898
1899
1900
1901
1902
1903
1904
1905
1906
1907
1908
1909
1910
1911
1912
1913
1914
1915
1916
1917
1918
1919
1920
1921
1922
1923
1924
1925
1926
1927
1928
1929
1930
1931
1932
1933
1934
1935
1936
1937
1938
1939
1940
1941
1942
1943
1944
1945
1946
1947
1948
1949
1950
1951
1952
1953
1954
1955
1956
1957
1958
1959
1960
1961
1962
1963
1964
1965
1966
1967
1968
1969
1970
1971
1972
1973
1974
1975
1976
1977
1978
1979
1980
1981
1982
1983
1984
1985
1986
1987
1988
1989
1990
1991
1992
1993
1994
1995
1996
1997
1998
1999
2000
2001
2002
2003
2004
2005
2006
2007
2008
2009
2010
2011
2012
2013
2014
2015
2016
2017
2018
2019
2020
2021
2022
2023
2024
2025
2026
2027
2028
2029
2030
2031
2032
2033
2034
2035
2036
2037
2038
2039
2040
2041
2042
2043
2044
2045
2046
2047
2048
2049
2050
2051
2052
2053
2054
2055
2056
2057
2058
2059
2060
2061
2062
2063
2064
2065
2066
2067
2068
2069
2070
2071
2072
2073
2074
2075
2076
2077
2078
2079
2080
2081
2082
2083
2084
2085
2086
2087
2088
2089
2090
2091
2092
2093
2094
2095
2096
2097
2098
2099
2100
2101
2102
2103
2104
2105
2106
2107
2108
2109
2110
2111
2112
2113
2114
2115
2116
2117
2118
2119
2120
2121
2122
2123
2124
2125
2126
2127
2128
2129
2130
2131
2132
2133
2134
2135
2136
2137
2138
2139
2140
2141
2142
2143
2144
2145
2146
2147
2148
2149
2150
2151
2152
2153
2154
2155
2156
2157
2158
2159
2160
2161
2162
2163
2164
2165
2166
2167
2168
2169
2170
2171
2172
2173
2174
2175
2176
2177
2178
2179
2180
2181
2182
2183
2184
2185
2186
2187
2188
2189
2190
2191
2192
2193
2194
2195
2196
2197
2198
2199
2200
2201
2202
2203
2204
2205
2206
2207
2208
2209
2210
2211
2212
2213
2214
2215
2216
2217
2218
2219
2220
2221
2222
2223
2224
2225
2226
2227
2228
2229
2230
2231
2232
2233
2234
2235
2236
2237
2238
2239
2240
2241
2242
2243
2244
2245
2246
2247
2248
2249
2250
2251
2252
2253
2254
2255
2256
2257
2258
2259
2260
2261
2262
2263
2264
2265
2266
2267
2268
2269
2270
2271
2272
2273
2274
2275
2276
2277
2278
2279
2280
2281
2282
2283
2284
2285
2286
2287
2288
2289
2290
2291
2292
2293
2294
2295
2296
2297
2298
2299
2300
2301
2302
2303
2304
2305
2306
2307
2308
2309
2310
2311
2312
2313
2314
2315
2316
2317
2318
2319
2320
2321
2322
2323
2324
2325
2326
2327
2328
2329
2330
2331
2332
2333
2334
2335
2336
2337
2338
2339
2340
2341
2342
2343
2344
2345
2346
2347
2348
2349
2350
2351
2352
2353
2354
2355
2356
2357
2358
2359
2360
2361
2362
2363
2364
2365
2366
2367
2368
2369
2370
2371
2372
2373
2374
2375
2376
2377
2378
2379
2380
2381
2382
2383
2384
2385
2386
2387
2388
2389
2390
2391
2392
2393
2394
2395
2396
2397
2398
2399
2400
2401
2402
2403
2404
2405
2406
2407
2408
2409
2410
2411
2412
2413
2414
2415
2416
2417
2418
2419
2420
2421
2422
2423
2424
2425
2426
2427
2428
2429
2430
2431
2432
2433
2434
2435
2436
2437
2438
2439
2440
2441
2442
2443
2444
2445
2446
2447
2448
2449
2450
2451
2452
2453
2454
2455
2456
2457
2458
2459
2460
2461
2462
2463
2464
2465
2466
2467
2468
2469
2470
2471
2472
2473
2474
2475
2476
2477
2478
2479
2480
2481
2482
2483
2484
2485
2486
2487
2488
2489
2490
2491
2492
2493
2494
2495
2496
2497
2498
2499
2500
2501
2502
2503
2504
2505
2506
2507
2508
2509
2510
2511
2512
2513
2514
2515
2516
2517
2518
2519
2520
2521
2522
2523
2524
2525
2526
2527
2528
2529
2530
2531
2532
2533
2534
2535
2536
2537
2538
2539
2540
2541
2542
2543
2544
2545
2546
2547
2548
2549
2550
2551
2552
2553
2554
2555
2556
2557
2558
2559
2560
2561
2562
2563
2564
2565
2566
2567
2568
2569
2570
2571
2572
2573
2574
2575
2576
2577
2578
2579
2580
2581
2582
2583
2584
2585
2586
2587
2588
2589
2590
2591
2592
2593
2594
2595
2596
2597
2598
2599
2600
2601
2602
2603
2604
2605
2606
2607
2608
2609
2610
2611
2612
2613
2614
2615
2616
2617
2618
2619
2620
2621
2622
2623
2624
2625
2626
2627
2628
2629
2630
2631
2632
2633
2634
2635
2636
2637
2638
2639
2640
2641
2642
2643
2644
2645
2646
2647
2648
2649
2650
2651
2652
2653
2654
2655
2656
2657
2658
2659
2660
2661
2662
2663
2664
2665
2666
2667
2668
2669
2670
2671
2672
2673
2674
2675
2676
2677
2678
2679
2680
2681
2682
2683
2684
2685
2686
2687
2688
2689
2690
2691
2692
2693
2694
2695
2696
2697
2698
2699
2700
2701
2702
2703
2704
2705
2706
2707
2708
2709
2710
2711
2712
2713
2714
2715
2716
2717
2718
2719
2720
2721
2722
2723
2724
2725
2726
2727
2728
2729
2730
2731
2732
2733
2734
2735
2736
2737
2738
2739
2740
2741
2742
2743
2744
2745
2746
2747
2748
2749
2750
2751
2752
2753
2754
2755
2756
2757
2758
2759
2760
2761
2762
2763
2764
2765
2766
2767
2768
2769
2770
2771
2772
2773
2774
2775
2776
2777
2778
2779
2780
2781
2782
/*++
/* NAME
/*	cleanup_milter 3
/* SUMMARY
/*	external mail filter support
/* SYNOPSIS
/*	#include <cleanup.h>
/*
/*	void	cleanup_milter_header_checks_init(void)
/*
/*	void	cleanup_milter_receive(state, count)
/*	CLEANUP_STATE *state;
/*	int	count;
/*
/*	void	cleanup_milter_inspect(state, milters)
/*	CLEANUP_STATE *state;
/*	MILTERS	*milters;
/*
/*	cleanup_milter_emul_mail(state, milters, sender)
/*	CLEANUP_STATE *state;
/*	MILTERS	*milters;
/*	const char *sender;
/*
/*	cleanup_milter_emul_rcpt(state, milters, recipient)
/*	CLEANUP_STATE *state;
/*	MILTERS	*milters;
/*	const char *recipient;
/*
/*	cleanup_milter_emul_data(state, milters)
/*	CLEANUP_STATE *state;
/*	MILTERS	*milters;
/* DESCRIPTION
/*	This module implements support for Sendmail-style mail
/*	filter (milter) applications, including in-place queue file
/*	modification.
/*
/*	cleanup_milter_header_checks_init() does pre-jail
/*	initializations.
/*
/*	cleanup_milter_receive() receives mail filter definitions,
/*	typically from an smtpd(8) server process, and registers
/*	local call-back functions for macro expansion and for queue
/*	file modification.
/*
/*	cleanup_milter_inspect() sends the current message headers
/*	and body to the mail filters that were received with
/*	cleanup_milter_receive(), or that are specified with the
/*	cleanup_milters configuration parameter.
/*
/*	cleanup_milter_emul_mail() emulates connect, helo and mail
/*	events for mail that does not arrive via the smtpd(8) server.
/*	The emulation pretends that mail arrives from localhost/127.0.0.1
/*	via ESMTP. Milters can reject emulated connect, helo, mail
/*	or data events, but not emulated rcpt events as described
/*	next.
/*
/*	cleanup_milter_emul_rcpt() emulates an rcpt event for mail
/*	that does not arrive via the smtpd(8) server. This reports
/*	a server configuration error condition when the milter
/*	rejects an emulated rcpt event.
/*
/*	cleanup_milter_emul_data() emulates a data event for mail
/*	that does not arrive via the smtpd(8) server.  It's OK for
/*	milters to reject emulated data events.
/* SEE ALSO
/*	milter(3) generic mail filter interface
/* DIAGNOSTICS
/*	Fatal errors: memory allocation problem.
/*	Panic: interface violation.
/*	Warnings: I/O errors (state->errs is updated accordingly).
/* LICENSE
/* .ad
/* .fi
/*	The Secure Mailer license must be distributed with this software.
/* AUTHOR(S)
/*	Wietse Venema
/*	IBM T.J. Watson Research
/*	P.O. Box 704
/*	Yorktown Heights, NY 10598, USA
/*
/*	Wietse Venema
/*	Google, Inc.
/*	111 8th Avenue
/*	New York, NY 10011, USA
/*--*/

/* System library. */

#include <sys_defs.h>
#include <sys/socket.h>			/* AF_INET */
#include <string.h>
#include <errno.h>

#ifdef STRCASECMP_IN_STRINGS_H
#include <strings.h>
#endif

/* Utility library. */

#include <msg.h>
#include <vstream.h>
#include <vstring.h>
#include <stringops.h>
#include <inet_proto.h>

/* Global library. */

#include <off_cvt.h>
#include <dsn_mask.h>
#include <rec_type.h>
#include <cleanup_user.h>
#include <record.h>
#include <rec_attr_map.h>
#include <mail_proto.h>
#include <mail_params.h>
#include <lex_822.h>
#include <is_header.h>
#include <quote_821_local.h>
#include <dsn_util.h>
#include <xtext.h>
#include <info_log_addr_form.h>
#include <header_opts.h>

/* Application-specific. */

#include <cleanup.h>

 /*
  * How Postfix 2.4 edits queue file information:
  * 
  * Mail filter applications (Milters) can send modification requests after
  * receiving the end of the message body.  Postfix implements these
  * modifications in the cleanup server, so that it can edit the queue file
  * in place. This avoids the temporary files that would be needed when
  * modifications were implemented in the SMTP server (Postfix normally does
  * not store the whole message in main memory). Once a Milter is done
  * editing, the queue file can be used as input for the next Milter, and so
  * on. Finally, the cleanup server changes file permissions, calls fsync(),
  * and waits for successful completion.
  * 
  * To implement in-place queue file edits, we need to introduce surprisingly
  * little change to the existing Postfix queue file structure.  All we need
  * is a way to mark a record as deleted, and to jump from one place in the
  * queue file to another. We could implement deleted records with jumps, but
  * marking is sometimes simpler.
  * 
  * Postfix does not store queue files as plain text files. Instead all
  * information is stored in records with an explicit type and length, for
  * sender, recipient, arrival time, and so on.  Even the content that makes
  * up the message header and body is stored as records with explicit types
  * and lengths.  This organization makes it very easy to mark a record as
  * deleted, and to introduce the pointer records that we will use to jump
  * from one place in a queue file to another place.
  * 
  * - Deleting a recipient is easiest - simply modify the record type into one
  * that is skipped by the software that delivers mail. We won't try to reuse
  * the deleted recipient for other purposes. When deleting a recipient, we
  * may need to delete multiple recipient records that result from virtual
  * alias expansion of the original recipient address.
  * 
  * - Replacing a header record involves pointer records. A record is replaced
  * by overwriting it with a forward pointer to space after the end of the
  * queue file, putting the new record there, followed by a reverse pointer
  * to the record that follows the replaced header. To simplify
  * implementation we follow a short header record with a filler record so
  * that we can always overwrite a header record with a pointer.
  * 
  * N.B. This is a major difference with Postfix version 2.3, which needed
  * complex code to save records that follow a short header, before it could
  * overwrite a short header record. This code contained two of the three
  * post-release bugs that were found with Postfix header editing.
  * 
  * - Inserting a header record is like replacing one, except that we also
  * relocate the record that is being overwritten by the forward pointer.
  * 
  * - Deleting a message header is simplest when we replace it by a "skip"
  * pointer to the information that follows the header. With a multi-line
  * header we need to update only the first line.
  * 
  * - Appending a recipient or header record involves pointer records as well.
  * To make this convenient, the queue file already contains dummy pointer
  * records at the locations where we want to append recipient or header
  * content. To append, change the dummy pointer into a forward pointer to
  * space after the end of a message, put the new recipient or header record
  * there, followed by a reverse pointer to the record that follows the
  * forward pointer.
  * 
  * - To append another header or recipient record, replace the reverse pointer
  * by a forward pointer to space after the end of a message, put the new
  * record there, followed by the value of the reverse pointer that we
  * replace. Thus, there is no one-to-one correspondence between forward and
  * backward pointers. Instead, there can be multiple forward pointers for
  * one reverse pointer.
  * 
  * - When a mail filter wants to replace an entire body, we overwrite existing
  * body records until we run out of space, and then write a pointer to space
  * after the end of the queue file, followed by more body content. There may
  * be multiple regions with body content; regions are connected by forward
  * pointers, and the last region ends with a pointer to the marker that ends
  * the message content segment. Body regions can be large and therefore they
  * are reused to avoid wasting space. Sendmail mail filters currently do not
  * replace individual body records, and that is a good thing.
  * 
  * Making queue file modifications safe:
  * 
  * Postfix queue files are segmented. The first segment is for envelope
  * records, the second for message header and body content, and the third
  * segment is for information that was extracted or generated from the
  * message header or body content.  Each segment is terminated by a marker
  * record. For now we don't want to change their location. That is, we want
  * to avoid moving the records that mark the start or end of a queue file
  * segment.
  * 
  * To ensure that we can always replace a header or body record by a pointer
  * record, without having to relocate a marker record, the cleanup server
  * places a dummy pointer record at the end of the recipients and at the end
  * of the message header. To support message body modifications, a dummy
  * pointer record is also placed at the end of the message content.
  * 
  * With all these changes in queue file organization, REC_TYPE_END is no longer
  * guaranteed to be the last record in a queue file. If an application were
  * to read beyond the REC_TYPE_END marker, it would go into an infinite
  * loop, because records after REC_TYPE_END alternate with reverse pointers
  * to the middle of the queue file. For robustness, the record reading
  * routine skips forward to the end-of-file position after reading the
  * REC_TYPE_END marker.
  */

/*#define msg_verbose	2*/

static HBC_CHECKS *cleanup_milter_hbc_checks;
static VSTRING *cleanup_milter_hbc_reply;
static void cleanup_milter_set_error(CLEANUP_STATE *, int);
static const char *cleanup_add_rcpt_par(void *, const char *, const char *);

#define STR(x)		vstring_str(x)
#define LEN(x)		VSTRING_LEN(x)

/* cleanup_milter_hbc_log - log post-milter header/body_checks action */

static void cleanup_milter_hbc_log(void *context, const char *action,
				        const char *where, const char *line,
				           const char *optional_text)
{
    const CLEANUP_STATE *state = (CLEANUP_STATE *) context;
    const char *attr;

    vstring_sprintf(state->temp1, "%s: milter-%s-%s: %s %.200s from %s[%s];",
		    state->queue_id, where, action, where, line,
		    state->client_name, state->client_addr);
    if (state->sender)
	vstring_sprintf_append(state->temp1, " from=<%s>",
			       info_log_addr_form_sender(state->sender));
    if (state->recip)
	vstring_sprintf_append(state->temp1, " to=<%s>",
			       info_log_addr_form_recipient(state->recip));
    if ((attr = nvtable_find(state->attr, MAIL_ATTR_LOG_PROTO_NAME)) != 0)
	vstring_sprintf_append(state->temp1, " proto=%s", attr);
    if ((attr = nvtable_find(state->attr, MAIL_ATTR_LOG_HELO_NAME)) != 0)
	vstring_sprintf_append(state->temp1, " helo=<%s>", attr);
    if (optional_text)
	vstring_sprintf_append(state->temp1, ": %s", optional_text);
    msg_info("%s", vstring_str(state->temp1));
}

/* cleanup_milter_header_prepend - prepend header to milter-generated header */

static void cleanup_milter_header_prepend(void *context, int rec_type,
			         const char *buf, ssize_t len, off_t offset)
{
    /* XXX save prepended header to buffer. */
    msg_warn("the milter_header/body_checks prepend action is not implemented");
}

/* cleanup_milter_hbc_extend - additional header/body_checks actions */

static char *cleanup_milter_hbc_extend(void *context, const char *command,
			         ssize_t cmd_len, const char *optional_text,
				         const char *where, const char *buf,
				               ssize_t buf_len, off_t offset)
{
    CLEANUP_STATE *state = (CLEANUP_STATE *) context;
    const char *map_class = VAR_MILT_HEAD_CHECKS;	/* XXX */

#define STREQUAL(x,y,l) (strncasecmp((x), (y), (l)) == 0 && (y)[l] == 0)

    /*
     * These are currently our mutually-exclusive ways of not receiving mail:
     * "reject" and "discard". Only these can be reported to the up-stream
     * Postfix libmilter code, because sending any reply there causes Postfix
     * libmilter to skip further "edit" requests. By way of safety net, each
     * of these must also reset CLEANUP_FLAG_FILTER_ALL.
     */
#define CLEANUP_MILTER_REJECTING_OR_DISCARDING_MESSAGE(state) \
    ((state->flags & CLEANUP_FLAG_DISCARD) || (state->errs & CLEANUP_STAT_CONT))

    /*
     * We log all header/body-checks actions here, because we know the
     * details of the message content that triggered the action. We report
     * detail-free milter-reply values (reject/discard, stored in the
     * milter_hbc_reply state member) to the Postfix libmilter code, so that
     * Postfix libmilter can stop sending requests.
     * 
     * We also set all applicable cleanup flags here, because there is no
     * guarantee that Postfix libmilter will propagate our own milter-reply
     * value to cleanup_milter_inspect() which calls cleanup_milter_apply().
     * The latter translates responses from Milter applications into cleanup
     * flags, and logs the response text. Postfix libmilter can convey only
     * one milter-reply value per email message, and that reply may even come
     * from outside Postfix.
     * 
     * To suppress redundant logging, cleanup_milter_apply() does nothing when
     * the milter-reply value matches the saved text in the milter_hbc_reply
     * state member. As we remember only one milter-reply value, we can't
     * report multiple milter-reply values per email message. We satisfy this
     * constraint, because we already clear the CLEANUP_FLAG_FILTER_ALL flags
     * to terminate further header inspection.
     */
    if ((state->flags & CLEANUP_FLAG_FILTER_ALL) == 0)
	return ((char *) buf);

    if (STREQUAL(command, "BCC", cmd_len)) {
	if (strchr(optional_text, '@') == 0) {
	    msg_warn("bad BCC address \"%s\" in %s map -- "
		     "need user@domain",
		     optional_text, VAR_MILT_HEAD_CHECKS);
	} else {
	    cleanup_milter_hbc_log(context, "bcc", where, buf, optional_text);
	    /* Caller checks state error flags. */
	    (void) cleanup_add_rcpt_par(state, optional_text, "");
	}
	return ((char *) buf);
    }
    if (STREQUAL(command, "REJECT", cmd_len)) {
	const CLEANUP_STAT_DETAIL *detail;

	if (state->reason)
	    myfree(state->reason);
	detail = cleanup_stat_detail(CLEANUP_STAT_CONT);
	if (*optional_text) {
	    state->reason = dsn_prepend(detail->dsn, optional_text);
	    if (*state->reason != '4' && *state->reason != '5') {
		msg_warn("bad DSN action in %s -- need 4.x.x or 5.x.x",
			 optional_text);
		*state->reason = '4';
	    }
	} else {
	    state->reason = dsn_prepend(detail->dsn, detail->text);
	}
	if (*state->reason == '4')
	    state->errs |= CLEANUP_STAT_DEFER;
	else
	    state->errs |= CLEANUP_STAT_CONT;
	state->flags &= ~CLEANUP_FLAG_FILTER_ALL;
	cleanup_milter_hbc_log(context, "reject", where, buf, state->reason);
	vstring_sprintf(cleanup_milter_hbc_reply, "%d %s",
			detail->smtp, state->reason);
	STR(cleanup_milter_hbc_reply)[0] = *state->reason;
	return ((char *) buf);
    }
    if (STREQUAL(command, "FILTER", cmd_len)) {
	if (*optional_text == 0) {
	    msg_warn("missing FILTER command argument in %s map", map_class);
	} else if (strchr(optional_text, ':') == 0) {
	    msg_warn("bad FILTER command %s in %s -- "
		     "need transport:destination",
		     optional_text, map_class);
	} else {
	    if (state->filter)
		myfree(state->filter);
	    state->filter = mystrdup(optional_text);
	    cleanup_milter_hbc_log(context, "filter", where, buf,
				   optional_text);
	}
	return ((char *) buf);
    }
    if (STREQUAL(command, "DISCARD", cmd_len)) {
	cleanup_milter_hbc_log(context, "discard", where, buf, optional_text);
	vstring_strcpy(cleanup_milter_hbc_reply, "D");
	state->flags |= CLEANUP_FLAG_DISCARD;
	state->flags &= ~CLEANUP_FLAG_FILTER_ALL;
	return ((char *) buf);
    }
    if (STREQUAL(command, "HOLD", cmd_len)) {
	if ((state->flags & (CLEANUP_FLAG_HOLD | CLEANUP_FLAG_DISCARD)) == 0) {
	    cleanup_milter_hbc_log(context, "hold", where, buf, optional_text);
	    state->flags |= CLEANUP_FLAG_HOLD;
	}
	return ((char *) buf);
    }
    if (STREQUAL(command, "REDIRECT", cmd_len)) {
	if (strchr(optional_text, '@') == 0) {
	    msg_warn("bad REDIRECT target \"%s\" in %s map -- "
		     "need user@domain",
		     optional_text, map_class);
	} else {
	    if (state->redirect)
		myfree(state->redirect);
	    state->redirect = mystrdup(optional_text);
	    cleanup_milter_hbc_log(context, "redirect", where, buf,
				   optional_text);
	    state->flags &= ~CLEANUP_FLAG_FILTER_ALL;
	}
	return ((char *) buf);
    }
    return ((char *) HBC_CHECKS_STAT_UNKNOWN);
}

/* cleanup_milter_header_checks - inspect Milter-generated header */

static int cleanup_milter_header_checks(CLEANUP_STATE *state, VSTRING *buf)
{
    char   *ret;

    /*
     * Milter application "add/insert/replace header" requests happen at the
     * end-of-message stage, therefore all the header operations are relative
     * to the primary message header.
     */
    ret = hbc_header_checks((void *) state, cleanup_milter_hbc_checks,
			    MIME_HDR_PRIMARY, (HEADER_OPTS *) 0,
			    buf, (off_t) 0);
    if (ret == 0) {
	return (0);
    } else if (ret == HBC_CHECKS_STAT_ERROR) {
	msg_warn("%s: %s map lookup problem -- "
		 "message not accepted, try again later",
		 state->queue_id, VAR_MILT_HEAD_CHECKS);
	state->errs |= CLEANUP_STAT_WRITE;
	return (0);
    } else {
	if (ret != STR(buf)) {
	    vstring_strcpy(buf, ret);
	    myfree(ret);
	}
	return (1);
    }
}

/* cleanup_milter_hbc_add_meta_records - add REDIRECT or FILTER meta records */

static void cleanup_milter_hbc_add_meta_records(CLEANUP_STATE *state)
{
    const char *myname = "cleanup_milter_hbc_add_meta_records";
    off_t   reverse_ptr_offset;
    off_t   new_meta_offset;

    /*
     * Note: this code runs while the Milter infrastructure is being torn
     * down. For this reason we handle all I/O errors here on the spot,
     * instead of reporting them back through the Milter infrastructure.
     */

    /*
     * Sanity check.
     */
    if (state->append_meta_pt_offset < 0)
	msg_panic("%s: no meta append pointer location", myname);
    if (state->append_meta_pt_target < 0)
	msg_panic("%s: no meta append pointer target", myname);

    /*
     * Allocate space after the end of the queue file, and write the meta
     * record(s), followed by a reverse pointer record that points to the
     * target of the old "meta record append" pointer record. This reverse
     * pointer record becomes the new "meta record append" pointer record.
     * Although the new "meta record append" pointer record will never be
     * used, we update it here to make the code more similar to other code
     * that inserts/appends content, so that common code can be factored out
     * later.
     */
    if ((new_meta_offset = vstream_fseek(state->dst, (off_t) 0, SEEK_END)) < 0) {
	cleanup_milter_set_error(state, errno);
	return;
    }
    if (state->filter != 0)
	cleanup_out_string(state, REC_TYPE_FILT, state->filter);
    if (state->redirect != 0)
	cleanup_out_string(state, REC_TYPE_RDR, state->redirect);
    if ((reverse_ptr_offset = vstream_ftell(state->dst)) < 0) {
	msg_warn("%s: vstream_ftell file %s: %m", myname, cleanup_path);
	state->errs |= CLEANUP_STAT_WRITE;
	return;
    }
    cleanup_out_format(state, REC_TYPE_PTR, REC_TYPE_PTR_FORMAT,
		       (long) state->append_meta_pt_target);

    /*
     * Pointer flipping: update the old "meta record append" pointer record
     * value with the location of the new meta record.
     */
    if (vstream_fseek(state->dst, state->append_meta_pt_offset, SEEK_SET) < 0) {
	cleanup_milter_set_error(state, errno);
	return;
    }
    cleanup_out_format(state, REC_TYPE_PTR, REC_TYPE_PTR_FORMAT,
		       (long) new_meta_offset);

    /*
     * Update the in-memory "meta append" pointer record location with the
     * location of the reverse pointer record that follows the new meta
     * record. The target of the "meta append" pointer record does not
     * change; it's always the record that follows the dummy pointer record
     * that was written while Postfix received the message.
     */
    state->append_meta_pt_offset = reverse_ptr_offset;

    /*
     * Note: state->append_meta_pt_target never changes.
     */
}

/* cleanup_milter_header_checks_init - initialize post-Milter header checks */

void    cleanup_milter_header_checks_init(void)
{
    static const char myname[] = "cleanup_milter_header_checks_init";

#define NO_NESTED_HDR_NAME	""
#define NO_NESTED_HDR_VALUE	""
#define NO_MIME_HDR_NAME	""
#define NO_MIME_HDR_VALUE	""

    static /* XXX not const */ HBC_CALL_BACKS call_backs = {
	cleanup_milter_hbc_log,
	cleanup_milter_header_prepend,
	cleanup_milter_hbc_extend,
    };

    if (*var_milt_head_checks == 0)
	msg_panic("%s: %s is empty", myname, VAR_MILT_HEAD_CHECKS);

    if (cleanup_milter_hbc_checks)
	msg_panic("%s: cleanup_milter_hbc_checks is not null", myname);
    cleanup_milter_hbc_checks =
	hbc_header_checks_create(VAR_MILT_HEAD_CHECKS, var_milt_head_checks,
				 NO_MIME_HDR_NAME, NO_MIME_HDR_VALUE,
				 NO_NESTED_HDR_NAME, NO_NESTED_HDR_VALUE,
				 &call_backs);

    if (cleanup_milter_hbc_reply)
	msg_panic("%s: cleanup_milter_hbc_reply is not null", myname);
    cleanup_milter_hbc_reply = vstring_alloc(100);
}

#ifdef TEST

/* cleanup_milter_header_checks_deinit - undo cleanup_milter_header_checks_init */

static void cleanup_milter_header_checks_deinit(void)
{
    static const char myname[] = "cleanup_milter_header_checks_deinit";

    if (cleanup_milter_hbc_checks == 0)
	msg_panic("%s: cleanup_milter_hbc_checks is null", myname);
    hbc_header_checks_free(cleanup_milter_hbc_checks);
    cleanup_milter_hbc_checks = 0;

    if (cleanup_milter_hbc_reply == 0)
	msg_panic("%s: cleanup_milter_hbc_reply is null", myname);
    vstring_free(cleanup_milter_hbc_reply);
    cleanup_milter_hbc_reply = 0;
}

#endif

/* cleanup_milter_header_checks_reinit - re-init post-Milter header checks */

static void cleanup_milter_header_checks_reinit(CLEANUP_STATE *state)
{
    if (state->filter)
	myfree(state->filter);
    state->filter = 0;
    if (state->redirect)
	myfree(state->redirect);
    state->redirect = 0;
    VSTRING_RESET(cleanup_milter_hbc_reply);
}

/* cleanup_milter_hbc_finish - finalize post-Milter header checks */

static void cleanup_milter_hbc_finish(CLEANUP_STATE *state)
{
    if (CLEANUP_OUT_OK(state)
	&& !CLEANUP_MILTER_REJECTING_OR_DISCARDING_MESSAGE(state)
	&& (state->filter || state->redirect))
	cleanup_milter_hbc_add_meta_records(state);
}

 /*
  * Milter replies.
  */
#define CLEANUP_MILTER_SET_REASON(__state, __reason) do { \
	if ((__state)->reason) \
	    myfree((__state)->reason); \
	(__state)->reason = mystrdup(__reason); \
	if ((__state)->smtp_reply) { \
	    myfree((__state)->smtp_reply); \
	    (__state)->smtp_reply = 0; \
	} \
    } while (0)

#define CLEANUP_MILTER_SET_SMTP_REPLY(__state, __smtp_reply) do { \
	if ((__state)->reason) \
	    myfree((__state)->reason); \
	(__state)->reason = mystrdup(__smtp_reply + 4); \
	printable((__state)->reason, '_'); \
	if ((__state)->smtp_reply) \
	    myfree((__state)->smtp_reply); \
	(__state)->smtp_reply = mystrdup(__smtp_reply); \
    } while (0)

/* cleanup_milter_set_error - set error flag from errno */

static void cleanup_milter_set_error(CLEANUP_STATE *state, int err)
{
    if (err == EFBIG) {
	msg_warn("%s: queue file size limit exceeded", state->queue_id);
	state->errs |= CLEANUP_STAT_SIZE;
    } else {
	msg_warn("%s: write queue file: %m", state->queue_id);
	state->errs |= CLEANUP_STAT_WRITE;
    }
}

/* cleanup_milter_error - return dummy error description */

static const char *cleanup_milter_error(CLEANUP_STATE *state, int err)
{
    const char *myname = "cleanup_milter_error";
    const CLEANUP_STAT_DETAIL *dp;

    /*
     * For consistency with error reporting within the milter infrastructure,
     * content manipulation routines return a null pointer on success, and an
     * SMTP-like response on error.
     * 
     * However, when cleanup_milter_apply() receives this error response from
     * the milter infrastructure, it ignores the text since the appropriate
     * cleanup error flags were already set by cleanup_milter_set_error().
     * 
     * Specify a null error number when the "errno to error flag" mapping was
     * already done elsewhere, possibly outside this module.
     */
    if (err)
	cleanup_milter_set_error(state, err);
    else if (CLEANUP_OUT_OK(state))
	msg_panic("%s: missing errno to error flag mapping", myname);
    if (state->milter_err_text == 0)
	state->milter_err_text = vstring_alloc(50);
    dp = cleanup_stat_detail(state->errs);
    return (STR(vstring_sprintf(state->milter_err_text,
				"%d %s %s", dp->smtp, dp->dsn, dp->text)));
}

/* cleanup_add_header - append message header */

static const char *cleanup_add_header(void *context, const char *name,
				              const char *space,
				              const char *value)
{
    const char *myname = "cleanup_add_header";
    CLEANUP_STATE *state = (CLEANUP_STATE *) context;
    VSTRING *buf;
    off_t   reverse_ptr_offset;
    off_t   new_hdr_offset;

    /*
     * To simplify implementation, the cleanup server writes a dummy "header
     * append" pointer record after the last message header. We cache both
     * the location and the target of the current "header append" pointer
     * record.
     */
    if (state->append_hdr_pt_offset < 0)
	msg_panic("%s: no header append pointer location", myname);
    if (state->append_hdr_pt_target < 0)
	msg_panic("%s: no header append pointer target", myname);

    /*
     * Return early when Milter header checks request that this header record
     * be dropped, or that the message is discarded. Note: CLEANUP_OUT_OK()
     * tests CLEANUP_FLAG_DISCARD. We don't want to report the latter as an
     * error.
     */
    buf = vstring_alloc(100);
    vstring_sprintf(buf, "%s:%s%s", name, space, value);
    if (cleanup_milter_hbc_checks) {
	if (cleanup_milter_header_checks(state, buf) == 0
	    || (state->flags & CLEANUP_FLAG_DISCARD)) {
	    vstring_free(buf);
	    return (0);
	}
	if (CLEANUP_OUT_OK(state) == 0) {
	    vstring_free(buf);
	    return (cleanup_milter_error(state, 0));
	}
    }

    /*
     * Allocate space after the end of the queue file, and write the header
     * record(s), followed by a reverse pointer record that points to the
     * target of the old "header append" pointer record. This reverse pointer
     * record becomes the new "header append" pointer record.
     */
    if ((new_hdr_offset = vstream_fseek(state->dst, (off_t) 0, SEEK_END)) < 0) {
	msg_warn("%s: seek file %s: %m", myname, cleanup_path);
	vstring_free(buf);
	return (cleanup_milter_error(state, errno));
    }
    /* XXX emit prepended header, then clear it. */
    cleanup_out_header(state, buf);		/* Includes padding */
    vstring_free(buf);
    if ((reverse_ptr_offset = vstream_ftell(state->dst)) < 0) {
	msg_warn("%s: vstream_ftell file %s: %m", myname, cleanup_path);
	return (cleanup_milter_error(state, errno));
    }
    cleanup_out_format(state, REC_TYPE_PTR, REC_TYPE_PTR_FORMAT,
		       (long) state->append_hdr_pt_target);

    /*
     * Pointer flipping: update the old "header append" pointer record value
     * with the location of the new header record.
     * 
     * XXX To avoid unnecessary seek operations when the new header immediately
     * follows the old append header pointer, write a null pointer or make
     * the record reading loop smarter. Making vstream_fseek() smarter does
     * not help, because it doesn't know if we're going to read or write
     * after a write+seek sequence.
     */
    if (vstream_fseek(state->dst, state->append_hdr_pt_offset, SEEK_SET) < 0) {
	msg_warn("%s: seek file %s: %m", myname, cleanup_path);
	return (cleanup_milter_error(state, errno));
    }
    cleanup_out_format(state, REC_TYPE_PTR, REC_TYPE_PTR_FORMAT,
		       (long) new_hdr_offset);

    /*
     * Update the in-memory "header append" pointer record location with the
     * location of the reverse pointer record that follows the new header.
     * The target of the "header append" pointer record does not change; it's
     * always the record that follows the dummy pointer record that was
     * written while Postfix received the message.
     */
    state->append_hdr_pt_offset = reverse_ptr_offset;

    /*
     * In case of error while doing record output.
     */
    return (CLEANUP_OUT_OK(state) == 0 ? cleanup_milter_error(state, 0) :
	    cleanup_milter_hbc_reply && LEN(cleanup_milter_hbc_reply) ?
	    STR(cleanup_milter_hbc_reply) : 0);

    /*
     * Note: state->append_hdr_pt_target never changes.
     */
}

/* hidden_header - respect milter header hiding protocol */

static int hidden_header(VSTRING *buf, ARGV *auto_hdrs, int *hide_done)
{
    char  **cpp;
    int     mask;

    for (cpp = auto_hdrs->argv, mask = 1; *cpp; cpp++, mask <<= 1)
	if ((*hide_done & mask) == 0 && strncmp(*cpp, STR(buf), LEN(buf)) == 0)
	    return (*hide_done |= mask);
    return (0);
}

/* cleanup_find_header_start - find specific header instance */

static off_t cleanup_find_header_start(CLEANUP_STATE *state, ssize_t index,
				               const char *header_label,
				               VSTRING *buf,
				               int *prec_type,
				               int allow_ptr_backup)
{
    const char *myname = "cleanup_find_header_start";
    off_t   curr_offset;		/* offset after found record */
    off_t   ptr_offset;			/* pointer to found record */
    VSTRING *ptr_buf = 0;
    int     rec_type = REC_TYPE_ERROR;
    int     last_type;
    ssize_t len;
    int     hide_done = 0;

    if (msg_verbose)
	msg_info("%s: index %ld name \"%s\"",
	      myname, (long) index, header_label ? header_label : "(none)");

    /*
     * Sanity checks.
     */
    if (index < 1)
	msg_panic("%s: bad header index %ld", myname, (long) index);

    /*
     * Skip to the start of the message content, and read records until we
     * either find the specified header, or until we hit the end of the
     * headers.
     * 
     * The index specifies the header instance: 1 is the first one. The header
     * label specifies the header name. A null pointer matches any header.
     * 
     * When the specified header is not found, the result value is -1.
     * 
     * When the specified header is found, its first record is stored in the
     * caller-provided read buffer, and the result value is the queue file
     * offset of that record. The file read position is left at the start of
     * the next (non-filler) queue file record, which can be the remainder of
     * a multi-record header.
     * 
     * When a header is found and allow_ptr_backup is non-zero, then the result
     * is either the first record of that header, or it is the pointer record
     * that points to the first record of that header. In the latter case,
     * the file read position is undefined. Returning the pointer allows us
     * to do some optimizations when inserting text multiple times at the
     * same place.
     * 
     * XXX We can't use the MIME processor here. It not only buffers up the
     * input, it also reads the record that follows a complete header before
     * it invokes the header call-back action. This complicates the way that
     * we discover header offsets and boundaries. Worse is that the MIME
     * processor is unaware that multi-record message headers can have PTR
     * records in the middle.
     * 
     * XXX The draw-back of not using the MIME processor is that we have to
     * duplicate some of its logic here and in the routine that finds the end
     * of the header record. To minimize the duplication we define an ugly
     * macro that is used in all code that scans for header boundaries.
     * 
     * XXX Sendmail compatibility (based on Sendmail 8.13.6 measurements).
     * 
     * - When changing Received: header #1, we change the Received: header that
     * follows our own one; a request to change Received: header #0 is
     * silently treated as a request to change Received: header #1.
     * 
     * - When changing Date: header #1, we change the first Date: header; a
     * request to change Date: header #0 is silently treated as a request to
     * change Date: header #1.
     * 
     * Thus, header change requests are relative to the content as received,
     * that is, the content after our own Received: header. They can affect
     * only the headers that the MTA actually exposes to mail filter
     * applications.
     * 
     * - However, when inserting a header at position 0, the new header appears
     * before our own Received: header, and when inserting at position 1, the
     * new header appears after our own Received: header.
     * 
     * Thus, header insert operations are relative to the content as delivered,
     * that is, the content including our own Received: header.
     * 
     * None of the above is applicable after a Milter inserts a header before
     * our own Received: header. From then on, our own Received: header
     * becomes just like other headers.
     */
#define CLEANUP_FIND_HEADER_NOTFOUND	(-1)
#define CLEANUP_FIND_HEADER_IOERROR	(-2)

#define CLEANUP_FIND_HEADER_RETURN(offs) do { \
	if (ptr_buf) \
	    vstring_free(ptr_buf); \
	return (offs); \
    } while (0)

#define GET_NEXT_TEXT_OR_PTR_RECORD(rec_type, state, buf, curr_offset, quit) \
    if ((rec_type = rec_get_raw(state->dst, buf, 0, REC_FLAG_NONE)) < 0) { \
	msg_warn("%s: read file %s: %m", myname, cleanup_path); \
	cleanup_milter_set_error(state, errno); \
	do { quit; } while (0); \
    } \
    if (msg_verbose > 1) \
	msg_info("%s: read: %ld: %.*s", myname, (long) curr_offset, \
		 LEN(buf) > 30 ? 30 : (int) LEN(buf), STR(buf)); \
    if (rec_type == REC_TYPE_DTXT) \
	continue; \
    if (rec_type != REC_TYPE_NORM && rec_type != REC_TYPE_CONT \
	&& rec_type != REC_TYPE_PTR) \
	break;
    /* End of hairy macros. */

    if (vstream_fseek(state->dst, state->data_offset, SEEK_SET) < 0) {
	msg_warn("%s: seek file %s: %m", myname, cleanup_path);
	cleanup_milter_set_error(state, errno);
	CLEANUP_FIND_HEADER_RETURN(CLEANUP_FIND_HEADER_IOERROR);
    }
    for (ptr_offset = 0, last_type = 0; /* void */ ; /* void */ ) {
	if ((curr_offset = vstream_ftell(state->dst)) < 0) {
	    msg_warn("%s: vstream_ftell file %s: %m", myname, cleanup_path);
	    cleanup_milter_set_error(state, errno);
	    CLEANUP_FIND_HEADER_RETURN(CLEANUP_FIND_HEADER_IOERROR);
	}
	/* Don't follow the "append header" pointer. */
	if (curr_offset == state->append_hdr_pt_offset)
	    break;
	/* Caution: this macro terminates the loop at end-of-message. */
	/* Don't do complex processing while breaking out of this loop. */
	GET_NEXT_TEXT_OR_PTR_RECORD(rec_type, state, buf, curr_offset,
		   CLEANUP_FIND_HEADER_RETURN(CLEANUP_FIND_HEADER_IOERROR));
	/* Caution: don't assume ptr->header. This may be header-ptr->body. */
	if (rec_type == REC_TYPE_PTR) {
	    if (rec_goto(state->dst, STR(buf)) < 0) {
		msg_warn("%s: read file %s: %m", myname, cleanup_path);
		cleanup_milter_set_error(state, errno);
		CLEANUP_FIND_HEADER_RETURN(CLEANUP_FIND_HEADER_IOERROR);
	    }
	    /* Save PTR record, in case it points to the start of a header. */
	    if (allow_ptr_backup) {
		ptr_offset = curr_offset;
		if (ptr_buf == 0)
		    ptr_buf = vstring_alloc(100);
		vstring_strcpy(ptr_buf, STR(buf));
	    }
	    /* Don't update last_type; PTR can happen after REC_TYPE_CONT. */
	    continue;
	}
	/* The middle of a multi-record header. */
	else if (last_type == REC_TYPE_CONT || IS_SPACE_TAB(STR(buf)[0])) {
	    /* Reset the saved PTR record and update last_type. */
	}
	/* No more message headers. */
	else if ((len = is_header(STR(buf))) == 0) {
	    break;
	}
	/* This the start of a message header. */
	else if ((header_label == 0
		  || (strncasecmp(header_label, STR(buf), len) == 0
		      && strlen(header_label) == len
		      && !hidden_header(buf, state->auto_hdrs, &hide_done)))
		 && --index == 0) {
	    /* If we have a saved PTR record, it points to start of header. */
	    break;
	}
	ptr_offset = 0;
	last_type = rec_type;
    }

    /*
     * In case of failure, return negative start position.
     */
    if (index > 0) {
	curr_offset = CLEANUP_FIND_HEADER_NOTFOUND;
    } else {

	/*
	 * Skip over short-header padding, so that the file read pointer is
	 * always positioned at the first non-padding record after the header
	 * record. Insist on padding after short a header record, so that a
	 * short header record can safely be overwritten by a pointer record.
	 */
	if (LEN(buf) < REC_TYPE_PTR_PAYL_SIZE) {
	    VSTRING *rbuf = (ptr_offset ? buf :
			     (ptr_buf ? ptr_buf :
			      (ptr_buf = vstring_alloc(100))));
	    int     rval;

	    if ((rval = rec_get_raw(state->dst, rbuf, 0, REC_FLAG_NONE)) < 0) {
		cleanup_milter_set_error(state, errno);
		CLEANUP_FIND_HEADER_RETURN(CLEANUP_FIND_HEADER_IOERROR);
	    }
	    if (rval != REC_TYPE_DTXT)
		msg_panic("%s: short header without padding", myname);
	}

	/*
	 * Optionally return a pointer to the message header, instead of the
	 * start of the message header itself. In that case the file read
	 * position is undefined (actually it is at the first non-padding
	 * record that follows the message header record).
	 */
	if (ptr_offset != 0) {
	    rec_type = REC_TYPE_PTR;
	    curr_offset = ptr_offset;
	    vstring_strcpy(buf, STR(ptr_buf));
	}
	*prec_type = rec_type;
    }
    if (msg_verbose)
	msg_info("%s: index %ld name %s type %d offset %ld",
		 myname, (long) index, header_label ?
		 header_label : "(none)", rec_type, (long) curr_offset);

    CLEANUP_FIND_HEADER_RETURN(curr_offset);
}

/* cleanup_find_header_end - find end of header */

static off_t cleanup_find_header_end(CLEANUP_STATE *state,
				             VSTRING *rec_buf,
				             int last_type)
{
    const char *myname = "cleanup_find_header_end";
    off_t   read_offset;
    int     rec_type;

    /*
     * This routine is called immediately after cleanup_find_header_start().
     * rec_buf is the cleanup_find_header_start() result record; last_type is
     * the corresponding record type: REC_TYPE_PTR or REC_TYPE_NORM; the file
     * read position is at the first non-padding record after the result
     * header record.
     */
    for (;;) {
	if ((read_offset = vstream_ftell(state->dst)) < 0) {
	    msg_warn("%s: read file %s: %m", myname, cleanup_path);
	    cleanup_milter_error(state, errno);
	    return (-1);
	}
	/* Don't follow the "append header" pointer. */
	if (read_offset == state->append_hdr_pt_offset)
	    break;
	/* Caution: this macro terminates the loop at end-of-message. */
	/* Don't do complex processing while breaking out of this loop. */
	GET_NEXT_TEXT_OR_PTR_RECORD(rec_type, state, rec_buf, read_offset,
	/* Warning and errno->error mapping are done elsewhere. */
				    return (-1));
	if (rec_type == REC_TYPE_PTR) {
	    if (rec_goto(state->dst, STR(rec_buf)) < 0) {
		msg_warn("%s: read file %s: %m", myname, cleanup_path);
		cleanup_milter_error(state, errno);
		return (-1);
	    }
	    /* Don't update last_type; PTR may follow REC_TYPE_CONT. */
	    continue;
	}
	/* Start of header or message body. */
	if (last_type != REC_TYPE_CONT && !IS_SPACE_TAB(STR(rec_buf)[0]))
	    break;
	last_type = rec_type;
    }
    return (read_offset);
}

/* cleanup_patch_header - patch new header into an existing header */

static const char *cleanup_patch_header(CLEANUP_STATE *state,
					        const char *new_hdr_name,
					        const char *hdr_space,
					        const char *new_hdr_value,
					        off_t old_rec_offset,
					        int old_rec_type,
					        VSTRING *old_rec_buf,
					        off_t next_offset)
{
    const char *myname = "cleanup_patch_header";
    VSTRING *buf = vstring_alloc(100);
    off_t   new_hdr_offset;

#define CLEANUP_PATCH_HEADER_RETURN(ret) do { \
	vstring_free(buf); \
	return (ret); \
    } while (0)

    if (msg_verbose)
	msg_info("%s: \"%s\" \"%s\" at %ld",
		 myname, new_hdr_name, new_hdr_value, (long) old_rec_offset);

    /*
     * Allocate space after the end of the queue file for the new header and
     * optionally save an existing record to make room for a forward pointer
     * record. If the saved record was not a PTR record, follow the saved
     * record by a reverse pointer record that points to the record after the
     * original location of the saved record.
     * 
     * We update the queue file in a safe manner: save the new header and the
     * existing records after the end of the queue file, write the reverse
     * pointer, and only then overwrite the saved records with the forward
     * pointer to the new header.
     * 
     * old_rec_offset, old_rec_type, and old_rec_buf specify the record that we
     * are about to overwrite with a pointer record. If the record needs to
     * be saved (i.e. old_rec_type > 0), the buffer contains the data content
     * of exactly one PTR or text record.
     * 
     * next_offset specifies the record that follows the to-be-overwritten
     * record. It is ignored when the to-be-saved record is a pointer record.
     */

    /*
     * Return early when Milter header checks request that this header record
     * be dropped.
     */
    vstring_sprintf(buf, "%s:%s%s", new_hdr_name, hdr_space, new_hdr_value);
    if (cleanup_milter_hbc_checks
	&& cleanup_milter_header_checks(state, buf) == 0)
	CLEANUP_PATCH_HEADER_RETURN(0);

    /*
     * Write the new header to a new location after the end of the queue
     * file.
     */
    if ((new_hdr_offset = vstream_fseek(state->dst, (off_t) 0, SEEK_END)) < 0) {
	msg_warn("%s: seek file %s: %m", myname, cleanup_path);
	CLEANUP_PATCH_HEADER_RETURN(cleanup_milter_error(state, errno));
    }
    /* XXX emit prepended header, then clear it. */
    cleanup_out_header(state, buf);		/* Includes padding */
    if (msg_verbose > 1)
	msg_info("%s: %ld: write %.*s", myname, (long) new_hdr_offset,
		 LEN(buf) > 30 ? 30 : (int) LEN(buf), STR(buf));

    /*
     * Optionally, save the existing text record or pointer record that will
     * be overwritten with the forward pointer. Pad a short saved record to
     * ensure that it, too, can be overwritten by a pointer.
     */
    if (old_rec_type > 0) {
	CLEANUP_OUT_BUF(state, old_rec_type, old_rec_buf);
	if (LEN(old_rec_buf) < REC_TYPE_PTR_PAYL_SIZE)
	    rec_pad(state->dst, REC_TYPE_DTXT,
		    REC_TYPE_PTR_PAYL_SIZE - LEN(old_rec_buf));
	if (msg_verbose > 1)
	    msg_info("%s: write %.*s", myname, LEN(old_rec_buf) > 30 ?
		     30 : (int) LEN(old_rec_buf), STR(old_rec_buf));
    }

    /*
     * If the saved record wasn't a PTR record, write the reverse pointer
     * after the saved records. A reverse pointer value of -1 means we were
     * confused about what we were going to save.
     */
    if (old_rec_type != REC_TYPE_PTR) {
	if (next_offset < 0)
	    msg_panic("%s: bad reverse pointer %ld",
		      myname, (long) next_offset);
	cleanup_out_format(state, REC_TYPE_PTR, REC_TYPE_PTR_FORMAT,
			   (long) next_offset);
	if (msg_verbose > 1)
	    msg_info("%s: write PTR %ld", myname, (long) next_offset);
    }

    /*
     * Write the forward pointer over the old record. Generally, a pointer
     * record will be shorter than a header record, so there will be a gap in
     * the queue file before the next record. In other words, we must always
     * follow pointer records otherwise we get out of sync with the data.
     */
    if (vstream_fseek(state->dst, old_rec_offset, SEEK_SET) < 0) {
	msg_warn("%s: seek file %s: %m", myname, cleanup_path);
	CLEANUP_PATCH_HEADER_RETURN(cleanup_milter_error(state, errno));
    }
    cleanup_out_format(state, REC_TYPE_PTR, REC_TYPE_PTR_FORMAT,
		       (long) new_hdr_offset);
    if (msg_verbose > 1)
	msg_info("%s: %ld: write PTR %ld", myname, (long) old_rec_offset,
		 (long) new_hdr_offset);

    /*
     * In case of error while doing record output.
     */
    CLEANUP_PATCH_HEADER_RETURN(
	       CLEANUP_OUT_OK(state) == 0 ? cleanup_milter_error(state, 0) :
		 cleanup_milter_hbc_reply && LEN(cleanup_milter_hbc_reply) ?
				STR(cleanup_milter_hbc_reply) : 0);

    /*
     * Note: state->append_hdr_pt_target never changes.
     */
}

/* cleanup_ins_header - insert message header */

static const char *cleanup_ins_header(void *context, ssize_t index,
				              const char *new_hdr_name,
				              const char *hdr_space,
				              const char *new_hdr_value)
{
    const char *myname = "cleanup_ins_header";
    CLEANUP_STATE *state = (CLEANUP_STATE *) context;
    VSTRING *old_rec_buf = vstring_alloc(100);
    off_t   old_rec_offset;
    int     old_rec_type;
    off_t   next_offset;
    const char *ret;

#define CLEANUP_INS_HEADER_RETURN(ret) do { \
	vstring_free(old_rec_buf); \
	return (ret); \
    } while (0)

    if (msg_verbose)
	msg_info("%s: %ld \"%s\" \"%s\"",
		 myname, (long) index, new_hdr_name, new_hdr_value);

    /*
     * Look for a header at the specified position.
     * 
     * The lookup result may be a pointer record. This allows us to make some
     * optimization when multiple insert operations happen in the same place.
     * 
     * Index 1 is the top-most header.
     */
#define NO_HEADER_NAME	((char *) 0)
#define ALLOW_PTR_BACKUP	1

    if (index < 1)
	index = 1;
    old_rec_offset = cleanup_find_header_start(state, index, NO_HEADER_NAME,
					       old_rec_buf, &old_rec_type,
					       ALLOW_PTR_BACKUP);
    if (old_rec_offset == CLEANUP_FIND_HEADER_IOERROR)
	/* Warning and errno->error mapping are done elsewhere. */
	CLEANUP_INS_HEADER_RETURN(cleanup_milter_error(state, 0));

    /*
     * If the header does not exist, simply append the header to the linked
     * list at the "header append" pointer record.
     */
    if (old_rec_offset < 0)
	CLEANUP_INS_HEADER_RETURN(cleanup_add_header(context, new_hdr_name,
						 hdr_space, new_hdr_value));

    /*
     * If the header does exist, save both the new and the existing header to
     * new storage at the end of the queue file, and link the new storage
     * with a forward and reverse pointer (don't write a reverse pointer if
     * we are starting with a pointer record).
     */
    if (old_rec_type == REC_TYPE_PTR) {
	next_offset = -1;
    } else {
	if ((next_offset = vstream_ftell(state->dst)) < 0) {
	    msg_warn("%s: read file %s: %m", myname, cleanup_path);
	    CLEANUP_INS_HEADER_RETURN(cleanup_milter_error(state, errno));
	}
    }
    ret = cleanup_patch_header(state, new_hdr_name, hdr_space, new_hdr_value,
			       old_rec_offset, old_rec_type,
			       old_rec_buf, next_offset);
    CLEANUP_INS_HEADER_RETURN(ret);
}

/* cleanup_upd_header - modify or append message header */

static const char *cleanup_upd_header(void *context, ssize_t index,
				              const char *new_hdr_name,
				              const char *hdr_space,
				              const char *new_hdr_value)
{
    const char *myname = "cleanup_upd_header";
    CLEANUP_STATE *state = (CLEANUP_STATE *) context;
    VSTRING *rec_buf;
    off_t   old_rec_offset;
    off_t   next_offset;
    int     last_type;
    const char *ret;

    if (msg_verbose)
	msg_info("%s: %ld \"%s\" \"%s\"",
		 myname, (long) index, new_hdr_name, new_hdr_value);

    /*
     * Sanity check.
     */
    if (*new_hdr_name == 0)
	msg_panic("%s: null header name", myname);

    /*
     * Find the header that is being modified.
     * 
     * The lookup result will never be a pointer record.
     * 
     * Index 1 is the first matching header instance.
     * 
     * XXX When a header is updated repeatedly we create jumps to jumps. To
     * eliminate this, rewrite the loop below so that we can start with the
     * pointer record that points to the header that's being edited.
     */
#define DONT_SAVE_RECORD	0
#define NO_PTR_BACKUP		0

#define CLEANUP_UPD_HEADER_RETURN(ret) do { \
	vstring_free(rec_buf); \
	return (ret); \
    } while (0)

    rec_buf = vstring_alloc(100);
    old_rec_offset = cleanup_find_header_start(state, index, new_hdr_name,
					       rec_buf, &last_type,
					       NO_PTR_BACKUP);
    if (old_rec_offset == CLEANUP_FIND_HEADER_IOERROR)
	/* Warning and errno->error mapping are done elsewhere. */
	CLEANUP_UPD_HEADER_RETURN(cleanup_milter_error(state, 0));

    /*
     * If no old header is found, simply append the new header to the linked
     * list at the "header append" pointer record.
     */
    if (old_rec_offset < 0)
	CLEANUP_UPD_HEADER_RETURN(cleanup_add_header(context, new_hdr_name,
						 hdr_space, new_hdr_value));

    /*
     * If the old header is found, find the end of the old header, save the
     * new header to new storage at the end of the queue file, and link the
     * new storage with a forward and reverse pointer.
     */
    if ((next_offset = cleanup_find_header_end(state, rec_buf, last_type)) < 0)
	/* Warning and errno->error mapping are done elsewhere. */
	CLEANUP_UPD_HEADER_RETURN(cleanup_milter_error(state, 0));
    ret = cleanup_patch_header(state, new_hdr_name, hdr_space, new_hdr_value,
			       old_rec_offset, DONT_SAVE_RECORD,
			       (VSTRING *) 0, next_offset);
    CLEANUP_UPD_HEADER_RETURN(ret);
}

/* cleanup_del_header - delete message header */

static const char *cleanup_del_header(void *context, ssize_t index,
				              const char *hdr_name)
{
    const char *myname = "cleanup_del_header";
    CLEANUP_STATE *state = (CLEANUP_STATE *) context;
    VSTRING *rec_buf;
    off_t   header_offset;
    off_t   next_offset;
    int     last_type;

    if (msg_verbose)
	msg_info("%s: %ld \"%s\"", myname, (long) index, hdr_name);

    /*
     * Sanity check.
     */
    if (*hdr_name == 0)
	msg_panic("%s: null header name", myname);

    /*
     * Find the header that is being deleted.
     * 
     * The lookup result will never be a pointer record.
     * 
     * Index 1 is the first matching header instance.
     */
#define CLEANUP_DEL_HEADER_RETURN(ret) do { \
	vstring_free(rec_buf); \
	return (ret); \
    } while (0)

    rec_buf = vstring_alloc(100);
    header_offset = cleanup_find_header_start(state, index, hdr_name, rec_buf,
					      &last_type, NO_PTR_BACKUP);
    if (header_offset == CLEANUP_FIND_HEADER_IOERROR)
	/* Warning and errno->error mapping are done elsewhere. */
	CLEANUP_DEL_HEADER_RETURN(cleanup_milter_error(state, 0));

    /*
     * Overwrite the beginning of the header record with a pointer to the
     * information that follows the header. We can't simply overwrite the
     * header with cleanup_out_header() and a special record type, because
     * there may be a PTR record in the middle of a multi-line header.
     */
    if (header_offset > 0) {
	if ((next_offset = cleanup_find_header_end(state, rec_buf, last_type)) < 0)
	    /* Warning and errno->error mapping are done elsewhere. */
	    CLEANUP_DEL_HEADER_RETURN(cleanup_milter_error(state, 0));
	/* Mark the header as deleted. */
	if (vstream_fseek(state->dst, header_offset, SEEK_SET) < 0) {
	    msg_warn("%s: seek file %s: %m", myname, cleanup_path);
	    CLEANUP_DEL_HEADER_RETURN(cleanup_milter_error(state, errno));
	}
	rec_fprintf(state->dst, REC_TYPE_PTR, REC_TYPE_PTR_FORMAT,
		    (long) next_offset);
    }
    vstring_free(rec_buf);

    /*
     * In case of error while doing record output.
     */
    return (CLEANUP_OUT_OK(state) ? 0 : cleanup_milter_error(state, 0));
}

/* cleanup_chg_from - replace sender address, ignore ESMTP arguments */

static const char *cleanup_chg_from(void *context, const char *ext_from,
				            const char *esmtp_args)
{
    const char *myname = "cleanup_chg_from";
    CLEANUP_STATE *state = (CLEANUP_STATE *) context;
    off_t   new_offset;
    off_t   new_sender_offset;
    off_t   after_sender_offs;
    int     addr_count;
    TOK822 *tree;
    TOK822 *tp;
    VSTRING *int_sender_buf;
    int     dsn_envid = 0;
    int     dsn_ret = 0;

    if (msg_verbose)
	msg_info("%s: \"%s\" \"%s\"", myname, ext_from, esmtp_args);

    /*
     * ESMTP support is limited to RET and ENVID, i.e. things that are stored
     * together with the sender queue file record.
     */
    if (esmtp_args[0]) {
	ARGV   *esmtp_argv;
	int     i;
	const char *arg;

	esmtp_argv = argv_split(esmtp_args, " ");
	for (i = 0; i < esmtp_argv->argc; ++i) {
	    arg = esmtp_argv->argv[i];
	    if (strncasecmp(arg, "RET=", 4) == 0) {
		if ((dsn_ret = dsn_ret_code(arg + 4)) == 0) {
		    msg_warn("Ignoring bad ESMTP parameter \"%s\" in "
			     "SMFI_CHGFROM request", arg);
		} else {
		    state->dsn_ret = dsn_ret;
		}
	    } else if (strncasecmp(arg, "ENVID=", 6) == 0) {
		if (state->milter_dsn_buf == 0)
		    state->milter_dsn_buf = vstring_alloc(20);
		dsn_envid = (xtext_unquote(state->milter_dsn_buf, arg + 6)
			     && allprint(STR(state->milter_dsn_buf)));
		if (!dsn_envid) {
		    msg_warn("Ignoring bad ESMTP parameter \"%s\" in "
			     "SMFI_CHGFROM request", arg);
		} else {
		    if (state->dsn_envid)
			myfree(state->dsn_envid);
		    state->dsn_envid = mystrdup(STR(state->milter_dsn_buf));
		}
	    } else {
		msg_warn("Ignoring bad ESMTP parameter \"%s\" in "
			 "SMFI_CHGFROM request", arg);
	    }
	}
	argv_free(esmtp_argv);
    }

    /*
     * The cleanup server remembers the file offset of the current sender
     * address record (offset in sender_pt_offset) and the file offset of the
     * record that follows the sender address (offset in sender_pt_target).
     * Short original sender records are padded, so that they can safely be
     * overwritten with a pointer record to the new sender address record.
     */
    if (state->sender_pt_offset < 0)
	msg_panic("%s: no original sender record offset", myname);
    if (state->sender_pt_target < 0)
	msg_panic("%s: no post-sender record offset", myname);

    /*
     * Allocate space after the end of the queue file, and write the new {DSN
     * envid, DSN ret, sender address, sender BCC} records, followed by a
     * reverse pointer record that points to the record that follows the
     * original sender record.
     * 
     * We update the queue file in a safe manner: save the new sender after the
     * end of the queue file, write the reverse pointer, and only then
     * overwrite the old sender record with the forward pointer to the new
     * sender.
     */
    if ((new_offset = vstream_fseek(state->dst, (off_t) 0, SEEK_END)) < 0) {
	msg_warn("%s: seek file %s: %m", myname, cleanup_path);
	return (cleanup_milter_error(state, errno));
    }

    /*
     * Sender DSN attribute records precede the sender record.
     */
    if (dsn_envid)
	rec_fprintf(state->dst, REC_TYPE_ATTR, "%s=%s",
		    MAIL_ATTR_DSN_ENVID, STR(state->milter_dsn_buf));
    if (dsn_ret)
	rec_fprintf(state->dst, REC_TYPE_ATTR, "%s=%d",
		    MAIL_ATTR_DSN_RET, dsn_ret);
    if (dsn_envid == 0 && dsn_ret == 0) {
	new_sender_offset = new_offset;
    } else if ((new_sender_offset = vstream_ftell(state->dst)) < 0) {
	msg_warn("%s: vstream_ftell file %s: %m", myname, cleanup_path);
	return (cleanup_milter_error(state, errno));
    }

    /*
     * Transform the address from external form to internal form. This also
     * removes the enclosing <>, if present.
     * 
     * XXX vstring_alloc() rejects zero-length requests.
     */
    int_sender_buf = vstring_alloc(strlen(ext_from) + 1);
    tree = tok822_parse(ext_from);
    for (addr_count = 0, tp = tree; tp != 0; tp = tp->next) {
	if (tp->type == TOK822_ADDR) {
	    if (addr_count == 0) {
		tok822_internalize(int_sender_buf, tp->head, TOK822_STR_DEFL);
		addr_count += 1;
	    } else {
		msg_warn("%s: Milter request to add multi-sender: \"%s\"",
			 state->queue_id, ext_from);
		break;
	    }
	}
    }
    tok822_free_tree(tree);
    after_sender_offs = cleanup_addr_sender(state, STR(int_sender_buf));
    vstring_free(int_sender_buf);
    cleanup_out_format(state, REC_TYPE_PTR, REC_TYPE_PTR_FORMAT,
		       (long) state->sender_pt_target);
    state->sender_pt_target = after_sender_offs;

    /*
     * Overwrite the current sender record with the pointer to the new {DSN
     * envid, DSN ret, sender address, sender BCC} records.
     */
    if (vstream_fseek(state->dst, state->sender_pt_offset, SEEK_SET) < 0) {
	msg_warn("%s: seek file %s: %m", myname, cleanup_path);
	return (cleanup_milter_error(state, errno));
    }
    cleanup_out_format(state, REC_TYPE_PTR, REC_TYPE_PTR_FORMAT,
		       (long) new_offset);

    /*
     * Remember the location of the new current sender record.
     */
    state->sender_pt_offset = new_sender_offset;

    /*
     * In case of error while doing record output.
     */
    return (CLEANUP_OUT_OK(state) ? 0 : cleanup_milter_error(state, 0));
}

/* cleanup_add_rcpt_par - append recipient address, with ESMTP arguments */

static const char *cleanup_add_rcpt_par(void *context, const char *ext_rcpt,
					        const char *esmtp_args)
{
    const char *myname = "cleanup_add_rcpt_par";
    CLEANUP_STATE *state = (CLEANUP_STATE *) context;
    off_t   new_rcpt_offset;
    off_t   reverse_ptr_offset;
    int     addr_count;
    TOK822 *tree;
    TOK822 *tp;
    VSTRING *int_rcpt_buf;
    VSTRING *orcpt_buf = 0;
    ARGV   *esmtp_argv;
    int     dsn_notify = 0;
    const char *dsn_orcpt_info = 0;
    size_t  type_len;
    int     i;
    const char *arg;
    const char *arg_val;

    if (msg_verbose)
	msg_info("%s: \"%s\" \"%s\"", myname, ext_rcpt, esmtp_args);

    /*
     * To simplify implementation, the cleanup server writes a dummy
     * "recipient append" pointer record after the last recipient. We cache
     * both the location and the target of the current "recipient append"
     * pointer record.
     */
    if (state->append_rcpt_pt_offset < 0)
	msg_panic("%s: no recipient append pointer location", myname);
    if (state->append_rcpt_pt_target < 0)
	msg_panic("%s: no recipient append pointer target", myname);

    /*
     * Allocate space after the end of the queue file, and write the
     * recipient record, followed by a reverse pointer record that points to
     * the target of the old "recipient append" pointer record. This reverse
     * pointer record becomes the new "recipient append" pointer record.
     * 
     * We update the queue file in a safe manner: save the new recipient after
     * the end of the queue file, write the reverse pointer, and only then
     * overwrite the old "recipient append" pointer with the forward pointer
     * to the new recipient.
     */
    if ((new_rcpt_offset = vstream_fseek(state->dst, (off_t) 0, SEEK_END)) < 0) {
	msg_warn("%s: seek file %s: %m", myname, cleanup_path);
	return (cleanup_milter_error(state, errno));
    }

    /*
     * Parse ESMTP parameters. XXX UTF8SMTP don't assume ORCPT is xtext.
     */
    if (esmtp_args[0]) {
	esmtp_argv = argv_split(esmtp_args, " ");
	for (i = 0; i < esmtp_argv->argc; ++i) {
	    arg = esmtp_argv->argv[i];
	    if (strncasecmp(arg, "NOTIFY=", 7) == 0) {	/* RFC 3461 */
		if (dsn_notify || (dsn_notify = dsn_notify_mask(arg + 7)) == 0)
		    msg_warn("%s: Bad NOTIFY parameter from Milter or "
			     "header/body_checks: \"%.100s\"",
			     state->queue_id, arg);
	    } else if (strncasecmp(arg, "ORCPT=", 6) == 0) {	/* RFC 3461 */
		if (orcpt_buf == 0)
		    orcpt_buf = vstring_alloc(100);
		if (dsn_orcpt_info
		    || (type_len = strcspn(arg_val = arg + 6, ";")) == 0
		    || (arg_val)[type_len] != ';'
		    || xtext_unquote_append(vstring_sprintf(orcpt_buf,
						    "%.*s;", (int) type_len,
							    arg_val),
					    arg_val + type_len + 1) == 0) {
		    msg_warn("%s: Bad ORCPT parameter from Milter or "
			     "header/body_checks: \"%.100s\"",
			     state->queue_id, arg);
		} else {
		    dsn_orcpt_info = STR(orcpt_buf);
		}
	    } else {
		msg_warn("%s: ignoring ESMTP argument from Milter or "
			 "header/body_checks: \"%.100s\"",
			 state->queue_id, arg);
	    }
	}
	argv_free(esmtp_argv);
    }

    /*
     * Transform recipient from external form to internal form. This also
     * removes the enclosing <>, if present.
     * 
     * XXX vstring_alloc() rejects zero-length requests.
     */
    int_rcpt_buf = vstring_alloc(strlen(ext_rcpt) + 1);
    tree = tok822_parse(ext_rcpt);
    for (addr_count = 0, tp = tree; tp != 0; tp = tp->next) {
	if (tp->type == TOK822_ADDR) {
	    if (addr_count == 0) {
		tok822_internalize(int_rcpt_buf, tp->head, TOK822_STR_DEFL);
		addr_count += 1;
	    } else {
		msg_warn("%s: Milter or header/body_checks request to "
			 "add multi-recipient: \"%s\"",
			 state->queue_id, ext_rcpt);
		break;
	    }
	}
    }
    tok822_free_tree(tree);
    if (addr_count != 0)
	cleanup_addr_bcc_dsn(state, STR(int_rcpt_buf), dsn_orcpt_info,
			     dsn_notify ? dsn_notify : DEF_DSN_NOTIFY);
    else
	msg_warn("%s: ignoring attempt from Milter to add null recipient",
		 state->queue_id);
    vstring_free(int_rcpt_buf);
    if (orcpt_buf)
	vstring_free(orcpt_buf);

    /*
     * Don't update the queue file when we did not write a recipient record
     * (malformed or duplicate BCC recipient).
     */
    if (vstream_ftell(state->dst) == new_rcpt_offset)
	return (CLEANUP_OUT_OK(state) ? 0 : cleanup_milter_error(state, 0));

    /*
     * Follow the recipient with a "reverse" pointer to the old recipient
     * append target.
     */
    if ((reverse_ptr_offset = vstream_ftell(state->dst)) < 0) {
	msg_warn("%s: vstream_ftell file %s: %m", myname, cleanup_path);
	return (cleanup_milter_error(state, errno));
    }
    cleanup_out_format(state, REC_TYPE_PTR, REC_TYPE_PTR_FORMAT,
		       (long) state->append_rcpt_pt_target);

    /*
     * Pointer flipping: update the old "recipient append" pointer record
     * value to the location of the new recipient record.
     */
    if (vstream_fseek(state->dst, state->append_rcpt_pt_offset, SEEK_SET) < 0) {
	msg_warn("%s: seek file %s: %m", myname, cleanup_path);
	return (cleanup_milter_error(state, errno));
    }
    cleanup_out_format(state, REC_TYPE_PTR, REC_TYPE_PTR_FORMAT,
		       (long) new_rcpt_offset);

    /*
     * Update the in-memory "recipient append" pointer record location with
     * the location of the reverse pointer record that follows the new
     * recipient. The target of the "recipient append" pointer record does
     * not change; it's always the record that follows the dummy pointer
     * record that was written while Postfix received the message.
     */
    state->append_rcpt_pt_offset = reverse_ptr_offset;

    /*
     * In case of error while doing record output.
     */
    return (CLEANUP_OUT_OK(state) ? 0 : cleanup_milter_error(state, 0));
}

/* cleanup_add_rcpt - append recipient address */

static const char *cleanup_add_rcpt(void *context, const char *ext_rcpt)
{
    return (cleanup_add_rcpt_par(context, ext_rcpt, ""));
}

/* cleanup_del_rcpt - remove recipient and all its expansions */

static const char *cleanup_del_rcpt(void *context, const char *ext_rcpt)
{
    const char *myname = "cleanup_del_rcpt";
    CLEANUP_STATE *state = (CLEANUP_STATE *) context;
    off_t   curr_offset;
    VSTRING *buf;
    char   *attr_name;
    char   *attr_value;
    char   *dsn_orcpt = 0;		/* XXX for dup filter cleanup */
    int     dsn_notify = 0;		/* XXX for dup filter cleanup */
    char   *orig_rcpt = 0;
    char   *start;
    int     rec_type;
    int     junk;
    int     count = 0;
    TOK822 *tree;
    TOK822 *tp;
    VSTRING *int_rcpt_buf;
    int     addr_count;

    if (msg_verbose)
	msg_info("%s: \"%s\"", myname, ext_rcpt);

    /*
     * Virtual aliasing and other address rewriting happens after the mail
     * filter sees the envelope address. Therefore we must delete all
     * recipient records whose Postfix (not DSN) original recipient address
     * matches the specified address.
     * 
     * As the number of recipients may be very large we can't do an efficient
     * two-pass implementation (collect record offsets first, then mark
     * records as deleted). Instead we mark records as soon as we find them.
     * This is less efficient because we do (seek-write-read) for each marked
     * recipient, instead of (seek-write). It's unlikely that VSTREAMs will
     * be made smart enough to eliminate unnecessary I/O with small seeks.
     * 
     * XXX When Postfix original recipients are turned off, we have no option
     * but to match against the expanded and rewritten recipient address.
     * 
     * XXX Remove the (dsn_orcpt, dsn_notify, orcpt, recip) tuple from the
     * duplicate recipient filter. This requires that we maintain reference
     * counts.
     */
    if (vstream_fseek(state->dst, 0L, SEEK_SET) < 0) {
	msg_warn("%s: seek file %s: %m", myname, cleanup_path);
	return (cleanup_milter_error(state, errno));
    }
#define CLEANUP_DEL_RCPT_RETURN(ret) do { \
	if (orig_rcpt != 0)	\
	    myfree(orig_rcpt); \
	if (dsn_orcpt != 0) \
	    myfree(dsn_orcpt); \
	vstring_free(buf); \
	vstring_free(int_rcpt_buf); \
	return (ret); \
    } while (0)

    /*
     * Transform recipient from external form to internal form. This also
     * removes the enclosing <>, if present.
     * 
     * XXX vstring_alloc() rejects zero-length requests.
     */
    int_rcpt_buf = vstring_alloc(strlen(ext_rcpt) + 1);
    tree = tok822_parse(ext_rcpt);
    for (addr_count = 0, tp = tree; tp != 0; tp = tp->next) {
	if (tp->type == TOK822_ADDR) {
	    if (addr_count == 0) {
		tok822_internalize(int_rcpt_buf, tp->head, TOK822_STR_DEFL);
		addr_count += 1;
	    } else {
		msg_warn("%s: Milter request to drop multi-recipient: \"%s\"",
			 state->queue_id, ext_rcpt);
		break;
	    }
	}
    }
    tok822_free_tree(tree);

    buf = vstring_alloc(100);
    for (;;) {
	if (CLEANUP_OUT_OK(state) == 0)
	    /* Warning and errno->error mapping are done elsewhere. */
	    CLEANUP_DEL_RCPT_RETURN(cleanup_milter_error(state, 0));
	if ((curr_offset = vstream_ftell(state->dst)) < 0) {
	    msg_warn("%s: vstream_ftell file %s: %m", myname, cleanup_path);
	    CLEANUP_DEL_RCPT_RETURN(cleanup_milter_error(state, errno));
	}
	if ((rec_type = rec_get_raw(state->dst, buf, 0, REC_FLAG_NONE)) <= 0) {
	    msg_warn("%s: read file %s: %m", myname, cleanup_path);
	    CLEANUP_DEL_RCPT_RETURN(cleanup_milter_error(state, errno));
	}
	if (rec_type == REC_TYPE_END)
	    break;
	/* Skip over message content. */
	if (rec_type == REC_TYPE_MESG) {
	    if (vstream_fseek(state->dst, state->xtra_offset, SEEK_SET) < 0) {
		msg_warn("%s: seek file %s: %m", myname, cleanup_path);
		CLEANUP_DEL_RCPT_RETURN(cleanup_milter_error(state, errno));
	    }
	    continue;
	}
	start = STR(buf);
	if (rec_type == REC_TYPE_PTR) {
	    if (rec_goto(state->dst, start) < 0) {
		msg_warn("%s: seek file %s: %m", myname, cleanup_path);
		CLEANUP_DEL_RCPT_RETURN(cleanup_milter_error(state, errno));
	    }
	    continue;
	}
	/* Map attribute names to pseudo record type. */
	if (rec_type == REC_TYPE_ATTR) {
	    if (split_nameval(STR(buf), &attr_name, &attr_value) != 0
		|| *attr_value == 0)
		continue;
	    if ((junk = rec_attr_map(attr_name)) != 0) {
		start = attr_value;
		rec_type = junk;
	    }
	}
	switch (rec_type) {
	case REC_TYPE_DSN_ORCPT:		/* RCPT TO ORCPT parameter */
	    if (dsn_orcpt != 0)			/* can't happen */
		myfree(dsn_orcpt);
	    dsn_orcpt = mystrdup(start);
	    break;
	case REC_TYPE_DSN_NOTIFY:		/* RCPT TO NOTIFY parameter */
	    if (alldig(start) && (junk = atoi(start)) > 0
		&& DSN_NOTIFY_OK(junk))
		dsn_notify = junk;
	    else
		dsn_notify = 0;
	    break;
	case REC_TYPE_ORCP:			/* unmodified RCPT TO address */
	    if (orig_rcpt != 0)			/* can't happen */
		myfree(orig_rcpt);
	    orig_rcpt = mystrdup(start);
	    break;
	case REC_TYPE_RCPT:			/* rewritten RCPT TO address */
	    if (strcmp(orig_rcpt ? orig_rcpt : start, STR(int_rcpt_buf)) == 0) {
		if (vstream_fseek(state->dst, curr_offset, SEEK_SET) < 0) {
		    msg_warn("%s: seek file %s: %m", myname, cleanup_path);
		    CLEANUP_DEL_RCPT_RETURN(cleanup_milter_error(state, errno));
		}
		if (REC_PUT_BUF(state->dst, REC_TYPE_DRCP, buf) < 0) {
		    msg_warn("%s: write queue file: %m", state->queue_id);
		    CLEANUP_DEL_RCPT_RETURN(cleanup_milter_error(state, errno));
		}
		count++;
	    }
	    if (var_enable_orcpt)
		/* Matches been_here() call in cleanup_out_recipient(). */
		been_here_drop(state->dups, "%s\n%d\n%s\n%s",
			       dsn_orcpt ? dsn_orcpt : "", dsn_notify,
			     orig_rcpt ? orig_rcpt : "", STR(int_rcpt_buf));
	    /* FALLTHROUGH */
	case REC_TYPE_DRCP:			/* canceled recipient */
	case REC_TYPE_DONE:			/* can't happen */
	    if (orig_rcpt != 0) {
		myfree(orig_rcpt);
		orig_rcpt = 0;
	    }
	    if (dsn_orcpt != 0) {
		myfree(dsn_orcpt);
		dsn_orcpt = 0;
	    }
	    dsn_notify = 0;
	    break;
	}
    }
    /* Matches been_here_fixed() call in cleanup_out_recipient(). */
    if (var_enable_orcpt == 0 && count > 0)
	been_here_drop_fixed(state->dups, STR(int_rcpt_buf));

    if (msg_verbose)
	msg_info("%s: deleted %d records for recipient \"%s\"",
		 myname, count, ext_rcpt);

    CLEANUP_DEL_RCPT_RETURN(0);
}

/* cleanup_repl_body - replace message body */

static const char *cleanup_repl_body(void *context, int cmd, int rec_type,
				             VSTRING *buf)
{
    const char *myname = "cleanup_repl_body";
    CLEANUP_STATE *state = (CLEANUP_STATE *) context;
    static VSTRING empty;

    /*
     * XXX Sendmail compatibility: milters don't see the first body line, so
     * don't expect they will send one.
     */
    switch (cmd) {
    case MILTER_BODY_LINE:
	if (cleanup_body_edit_write(state, rec_type, buf) < 0)
	    return (cleanup_milter_error(state, errno));
	break;
    case MILTER_BODY_START:
	VSTRING_RESET(&empty);
	if (cleanup_body_edit_start(state) < 0
	    || cleanup_body_edit_write(state, REC_TYPE_NORM, &empty) < 0)
	    return (cleanup_milter_error(state, errno));
	break;
    case MILTER_BODY_END:
	if (cleanup_body_edit_finish(state) < 0)
	    return (cleanup_milter_error(state, errno));
	break;
    default:
	msg_panic("%s: bad command: %d", myname, cmd);
    }
    return (CLEANUP_OUT_OK(state) ? 0 : cleanup_milter_error(state, errno));
}

/* cleanup_milter_eval - expand macro */

static const char *cleanup_milter_eval(const char *name, void *ptr)
{
    CLEANUP_STATE *state = (CLEANUP_STATE *) ptr;

    /*
     * Note: if we use XFORWARD attributes here, then consistency requires
     * that we forward all Sendmail macros via XFORWARD.
     */

    /*
     * System macros.
     */
    if (strcmp(name, S8_MAC_DAEMON_NAME) == 0)
	return (var_milt_daemon_name);
    if (strcmp(name, S8_MAC_V) == 0)
	return (var_milt_v);

    /*
     * Connect macros.
     */
#ifndef CLIENT_ATTR_UNKNOWN
#define CLIENT_ATTR_UNKNOWN "unknown"
#define SERVER_ATTR_UNKNOWN "unknown"
#endif

    if (strcmp(name, S8_MAC__) == 0) {
	vstring_sprintf(state->temp1, "%s [%s]",
			state->reverse_name, state->client_addr);
	if (strcasecmp(state->client_name, state->reverse_name) != 0)
	    vstring_strcat(state->temp1, " (may be forged)");
	return (STR(state->temp1));
    }
    if (strcmp(name, S8_MAC_J) == 0)
	return (var_myhostname);
    if (strcmp(name, S8_MAC_CLIENT_ADDR) == 0)
	return (state->client_addr);
    if (strcmp(name, S8_MAC_CLIENT_NAME) == 0)
	return (state->client_name);
    if (strcmp(name, S8_MAC_CLIENT_PORT) == 0)
	return (state->client_port
		&& strcmp(state->client_port, CLIENT_ATTR_UNKNOWN) ?
		state->client_port : "0");
    if (strcmp(name, S8_MAC_CLIENT_PTR) == 0)
	return (state->reverse_name);
    /* XXX S8_MAC_CLIENT_RES needs SMTPD_PEER_CODE_XXX from smtpd. */
    if (strcmp(name, S8_MAC_DAEMON_ADDR) == 0)
	return (state->server_addr);
    if (strcmp(name, S8_MAC_DAEMON_PORT) == 0)
	return (state->server_port
		&& strcmp(state->server_port, SERVER_ATTR_UNKNOWN) ?
		state->server_port : "0");

    /*
     * MAIL FROM macros.
     */
    if (strcmp(name, S8_MAC_I) == 0)
	return (state->queue_id);
#ifdef USE_SASL_AUTH
    if (strcmp(name, S8_MAC_AUTH_TYPE) == 0)
	return (nvtable_find(state->attr, MAIL_ATTR_SASL_METHOD));
    if (strcmp(name, S8_MAC_AUTH_AUTHEN) == 0)
	return (nvtable_find(state->attr, MAIL_ATTR_SASL_USERNAME));
    if (strcmp(name, S8_MAC_AUTH_AUTHOR) == 0)
	return (nvtable_find(state->attr, MAIL_ATTR_SASL_SENDER));
#endif
    if (strcmp(name, S8_MAC_MAIL_ADDR) == 0)
	return (state->milter_ext_from ? STR(state->milter_ext_from) : 0);

    /*
     * RCPT TO macros.
     */
    if (strcmp(name, S8_MAC_RCPT_ADDR) == 0)
	return (state->milter_ext_rcpt ? STR(state->milter_ext_rcpt) : 0);
    return (0);
}

/* cleanup_milter_receive - receive milter instances */

void    cleanup_milter_receive(CLEANUP_STATE *state, int count)
{
    if (state->milters)
	milter_free(state->milters);
    state->milters = milter_receive(state->src, count);
    if (state->milters == 0)
	msg_fatal("cleanup_milter_receive: milter receive failed");
    if (count <= 0)
	return;
    milter_macro_callback(state->milters, cleanup_milter_eval, (void *) state);
    milter_edit_callback(state->milters,
			 cleanup_add_header, cleanup_upd_header,
			 cleanup_ins_header, cleanup_del_header,
			 cleanup_chg_from, cleanup_add_rcpt,
			 cleanup_add_rcpt_par, cleanup_del_rcpt,
			 cleanup_repl_body, (void *) state);
}

/* cleanup_milter_apply - apply Milter response, non-zero if rejecting */

static const char *cleanup_milter_apply(CLEANUP_STATE *state, const char *event,
					        const char *resp)
{
    const char *myname = "cleanup_milter_apply";
    const char *action;
    const char *text;
    const char *attr;
    const char *ret = 0;

    if (msg_verbose)
	msg_info("%s: %s", myname, resp);

    /*
     * Don't process our own milter_header/body checks replies. See comments
     * in cleanup_milter_hbc_extend().
     */
    if (cleanup_milter_hbc_reply &&
	strcmp(resp, STR(cleanup_milter_hbc_reply)) == 0)
	return (0);

    /*
     * Don't process Milter replies that are redundant because header/body
     * checks already decided that we will not receive the message; or Milter
     * replies that would have conflicting effect with the outcome of
     * header/body checks (for example, header_checks "discard" action
     * followed by Milter "reject" reply). Logging both actions would look
     * silly.
     */
    if (CLEANUP_MILTER_REJECTING_OR_DISCARDING_MESSAGE(state)) {
	if (msg_verbose)
	    msg_info("%s: ignoring redundant or conflicting milter reply: %s",
		     state->queue_id, resp);
	return (0);
    }

    /*
     * Sanity check.
     */
    if (state->client_name == 0)
	msg_panic("%s: missing client info initialization", myname);

    /*
     * We don't report errors that were already reported by the content
     * editing call-back routines. See cleanup_milter_error() above.
     */
    if (CLEANUP_OUT_OK(state) == 0)
	return (0);
    switch (resp[0]) {
    case 'H':
	/* XXX Should log the reason here. */
	if (state->flags & CLEANUP_FLAG_HOLD)
	    return (0);
	state->flags |= CLEANUP_FLAG_HOLD;
	action = "milter-hold";
	text = "milter triggers HOLD action";
	break;
    case 'D':
	state->flags |= CLEANUP_FLAG_DISCARD;
	action = "milter-discard";
	text = "milter triggers DISCARD action";
	break;
    case 'S':
	/* XXX Can this happen after end-of-message? */
	state->flags |= CLEANUP_STAT_CONT;
	action = "milter-reject";
	text = cleanup_strerror(CLEANUP_STAT_CONT);
	break;

	/*
	 * Override permanent reject with temporary reject. This happens when
	 * the cleanup server has to bounce (hard reject) but is unable to
	 * store the message (soft reject). After a temporary reject we stop
	 * inspecting queue file records, so it can't be overruled by
	 * something else.
	 * 
	 * CLEANUP_STAT_CONT and CLEANUP_STAT_DEFER both update the reason
	 * attribute, but CLEANUP_STAT_DEFER takes precedence. It terminates
	 * queue record processing, and prevents bounces from being sent.
	 */
    case '4':
	CLEANUP_MILTER_SET_SMTP_REPLY(state, resp);
	ret = state->reason;
	state->errs |= CLEANUP_STAT_DEFER;
	action = "milter-reject";
	text = resp + 4;
	break;
    case '5':
	CLEANUP_MILTER_SET_SMTP_REPLY(state, resp);
	ret = state->reason;
	state->errs |= CLEANUP_STAT_CONT;
	action = "milter-reject";
	text = resp + 4;
	break;
    default:
	msg_panic("%s: unexpected mail filter reply: %s", myname, resp);
    }
    vstring_sprintf(state->temp1, "%s: %s: %s from %s[%s]: %s;",
		    state->queue_id, action, event, state->client_name,
		    state->client_addr, text);
    if (state->sender)
	vstring_sprintf_append(state->temp1, " from=<%s>",
			       info_log_addr_form_sender(state->sender));
    if (state->recip)
	vstring_sprintf_append(state->temp1, " to=<%s>",
			       info_log_addr_form_recipient(state->recip));
    if ((attr = nvtable_find(state->attr, MAIL_ATTR_LOG_PROTO_NAME)) != 0)
	vstring_sprintf_append(state->temp1, " proto=%s", attr);
    if ((attr = nvtable_find(state->attr, MAIL_ATTR_LOG_HELO_NAME)) != 0)
	vstring_sprintf_append(state->temp1, " helo=<%s>", attr);
    msg_info("%s", vstring_str(state->temp1));

    return (ret);
}

/* cleanup_milter_client_init - initialize real or ersatz client info */

static void cleanup_milter_client_init(CLEANUP_STATE *state)
{
    static const INET_PROTO_INFO *proto_info;
    const char *proto_attr;

    /*
     * Either the cleanup client specifies a name, address and protocol, or
     * we have a local submission and pretend localhost/127.0.0.1/AF_INET.
     */
#define NO_CLIENT_PORT	"0"

    state->client_name = nvtable_find(state->attr, MAIL_ATTR_ACT_CLIENT_NAME);
    state->reverse_name =
	nvtable_find(state->attr, MAIL_ATTR_ACT_REVERSE_CLIENT_NAME);
    state->client_addr = nvtable_find(state->attr, MAIL_ATTR_ACT_CLIENT_ADDR);
    state->client_port = nvtable_find(state->attr, MAIL_ATTR_ACT_CLIENT_PORT);
    proto_attr = nvtable_find(state->attr, MAIL_ATTR_ACT_CLIENT_AF);
    state->server_addr = nvtable_find(state->attr, MAIL_ATTR_ACT_SERVER_ADDR);
    state->server_port = nvtable_find(state->attr, MAIL_ATTR_ACT_SERVER_PORT);

    if (state->client_name == 0 || state->client_addr == 0 || proto_attr == 0
	|| !alldig(proto_attr)) {
	state->client_name = "localhost";
#ifdef AF_INET6
	if (proto_info == 0)
	    proto_info = inet_proto_info();
	if (proto_info->sa_family_list[0] == PF_INET6) {
	    state->client_addr = "::1";
	    state->client_af = AF_INET6;
	} else
#endif
	{
	    state->client_addr = "127.0.0.1";
	    state->client_af = AF_INET;
	}
	state->server_addr = state->client_addr;
    } else
	state->client_af = atoi(proto_attr);
    if (state->reverse_name == 0)
	state->reverse_name = state->client_name;
    /* Compatibility with pre-2.5 queue files. */
    if (state->client_port == 0) {
	state->client_port = NO_CLIENT_PORT;
	state->server_port = state->client_port;
    }
}

/* cleanup_milter_inspect - run message through mail filter */

void    cleanup_milter_inspect(CLEANUP_STATE *state, MILTERS *milters)
{
    const char *myname = "cleanup_milter";
    const char *resp;

    if (msg_verbose)
	msg_info("enter %s", myname);

    /*
     * Initialize, in case we're called via smtpd(8).
     */
    if (state->client_name == 0)
	cleanup_milter_client_init(state);

    /*
     * Prologue: prepare for Milter header/body checks.
     */
    if (*var_milt_head_checks)
	cleanup_milter_header_checks_reinit(state);

    /*
     * Process mail filter replies. The reply format is verified by the mail
     * filter library.
     */
    if ((resp = milter_message(milters, state->handle->stream,
			       state->data_offset, state->auto_hdrs)) != 0)
	cleanup_milter_apply(state, "END-OF-MESSAGE", resp);

    /*
     * Epilogue: finalize Milter header/body checks.
     */
    if (*var_milt_head_checks)
	cleanup_milter_hbc_finish(state);

    if (msg_verbose)
	msg_info("leave %s", myname);
}

/* cleanup_milter_emul_mail - emulate connect/ehlo/mail event */

void    cleanup_milter_emul_mail(CLEANUP_STATE *state,
				         MILTERS *milters,
				         const char *addr)
{
    const char *resp;
    const char *helo;
    const char *argv[2];

    /*
     * Per-connection initialization.
     */
    milter_macro_callback(milters, cleanup_milter_eval, (void *) state);
    milter_edit_callback(milters,
			 cleanup_add_header, cleanup_upd_header,
			 cleanup_ins_header, cleanup_del_header,
			 cleanup_chg_from, cleanup_add_rcpt,
			 cleanup_add_rcpt_par, cleanup_del_rcpt,
			 cleanup_repl_body, (void *) state);
    if (state->client_name == 0)
	cleanup_milter_client_init(state);

    /*
     * Emulate SMTP events.
     */
    if ((resp = milter_conn_event(milters, state->client_name, state->client_addr,
			      state->client_port, state->client_af)) != 0) {
	cleanup_milter_apply(state, "CONNECT", resp);
	return;
    }
#define PRETEND_ESMTP	1

    if (CLEANUP_MILTER_OK(state)) {
	if ((helo = nvtable_find(state->attr, MAIL_ATTR_ACT_HELO_NAME)) == 0)
	    helo = state->client_name;
	if ((resp = milter_helo_event(milters, helo, PRETEND_ESMTP)) != 0) {
	    cleanup_milter_apply(state, "EHLO", resp);
	    return;
	}
    }
    if (CLEANUP_MILTER_OK(state)) {
	if (state->milter_ext_from == 0)
	    state->milter_ext_from = vstring_alloc(100);
	/* Sendmail 8.13 does not externalize the null address. */
	if (*addr)
	    quote_821_local(state->milter_ext_from, addr);
	else
	    vstring_strcpy(state->milter_ext_from, addr);
	argv[0] = STR(state->milter_ext_from);
	argv[1] = 0;
	if ((resp = milter_mail_event(milters, argv)) != 0) {
	    cleanup_milter_apply(state, "MAIL", resp);
	    return;
	}
    }
}

/* cleanup_milter_emul_rcpt - emulate rcpt event */

void    cleanup_milter_emul_rcpt(CLEANUP_STATE *state,
				         MILTERS *milters,
				         const char *addr)
{
    const char *myname = "cleanup_milter_emul_rcpt";
    const char *resp;
    const char *argv[2];

    /*
     * Sanity check.
     */
    if (state->client_name == 0)
	msg_panic("%s: missing client info initialization", myname);

    /*
     * CLEANUP_STAT_CONT and CLEANUP_STAT_DEFER both update the reason
     * attribute, but CLEANUP_STAT_DEFER takes precedence. It terminates
     * queue record processing, and prevents bounces from being sent.
     */
    if (state->milter_ext_rcpt == 0)
	state->milter_ext_rcpt = vstring_alloc(100);
    /* Sendmail 8.13 does not externalize the null address. */
    if (*addr)
	quote_821_local(state->milter_ext_rcpt, addr);
    else
	vstring_strcpy(state->milter_ext_rcpt, addr);
    argv[0] = STR(state->milter_ext_rcpt);
    argv[1] = 0;
    if ((resp = milter_rcpt_event(milters, MILTER_FLAG_NONE, argv)) != 0
	&& cleanup_milter_apply(state, "RCPT", resp) != 0) {
	msg_warn("%s: milter configuration error: can't reject recipient "
		 "in non-smtpd(8) submission", state->queue_id);
	msg_warn("%s: message not accepted, try again later", state->queue_id);
	CLEANUP_MILTER_SET_REASON(state, "4.3.5 Server configuration error");
	state->errs |= CLEANUP_STAT_DEFER;
    }
}

/* cleanup_milter_emul_data - emulate data event */

void    cleanup_milter_emul_data(CLEANUP_STATE *state, MILTERS *milters)
{
    const char *myname = "cleanup_milter_emul_data";
    const char *resp;

    /*
     * Sanity check.
     */
    if (state->client_name == 0)
	msg_panic("%s: missing client info initialization", myname);

    if ((resp = milter_data_event(milters)) != 0)
	cleanup_milter_apply(state, "DATA", resp);
}

#ifdef TEST

 /*
  * Queue file editing driver for regression tests. In this case it is OK to
  * report fatal errors after I/O errors.
  */
#include <stdio.h>
#include <msg_vstream.h>
#include <vstring_vstream.h>
#include <mail_addr.h>
#include <mail_version.h>

#undef msg_verbose

char   *cleanup_path;
VSTRING *cleanup_trace_path;
VSTRING *cleanup_strip_chars;
int     cleanup_comm_canon_flags;
MAPS   *cleanup_comm_canon_maps;
int     cleanup_ext_prop_mask;
ARGV   *cleanup_masq_domains;
int     cleanup_masq_flags;
MAPS   *cleanup_rcpt_bcc_maps;
int     cleanup_rcpt_canon_flags;
MAPS   *cleanup_rcpt_canon_maps;
MAPS   *cleanup_send_bcc_maps;
int     cleanup_send_canon_flags;
MAPS   *cleanup_send_canon_maps;
int     var_dup_filter_limit = DEF_DUP_FILTER_LIMIT;
char   *var_empty_addr = DEF_EMPTY_ADDR;
MAPS   *cleanup_virt_alias_maps;
char   *var_milt_daemon_name = "host.example.com";
char   *var_milt_v = DEF_MILT_V;
MILTERS *cleanup_milters = (MILTERS *) ((char *) sizeof(*cleanup_milters));
char   *var_milt_head_checks = "";

/* Dummies to satisfy unused external references. */

int     cleanup_masquerade_internal(CLEANUP_STATE *state, VSTRING *addr, ARGV *masq_domains)
{
    msg_panic("cleanup_masquerade_internal dummy");
}

int     cleanup_rewrite_internal(const char *context, VSTRING *result,
				         const char *addr)
{
    vstring_strcpy(result, addr);
    return (0);
}

int     cleanup_map11_internal(CLEANUP_STATE *state, VSTRING *addr,
			               MAPS *maps, int propagate)
{
    msg_panic("cleanup_map11_internal dummy");
}

ARGV   *cleanup_map1n_internal(CLEANUP_STATE *state, const char *addr,
			               MAPS *maps, int propagate)
{
    msg_panic("cleanup_map1n_internal dummy");
}

void    cleanup_envelope(CLEANUP_STATE *state, int type, const char *buf,
			         ssize_t len)
{
    msg_panic("cleanup_envelope dummy");
}

static void usage(void)
{
    msg_warn("usage:");
    msg_warn("    verbose on|off");
    msg_warn("    open pathname");
    msg_warn("    close");
    msg_warn("    add_header index name [value]");
    msg_warn("    ins_header index name [value]");
    msg_warn("    upd_header index name [value]");
    msg_warn("    del_header index name");
    msg_warn("    chg_from addr parameters");
    msg_warn("    add_rcpt addr");
    msg_warn("    add_rcpt_par addr parameters");
    msg_warn("    del_rcpt addr");
    msg_warn("    replbody pathname");
    msg_warn("    header_checks type:name");
}

/* flatten_args - unparse partial command line */

static void flatten_args(VSTRING *buf, char **argv)
{
    char  **cpp;

    VSTRING_RESET(buf);
    for (cpp = argv; *cpp; cpp++) {
	vstring_strcat(buf, *cpp);
	if (cpp[1])
	    VSTRING_ADDCH(buf, ' ');
    }
    VSTRING_TERMINATE(buf);
}

/* open_queue_file - open an unedited queue file (all-zero dummy PTRs) */

static void open_queue_file(CLEANUP_STATE *state, const char *path)
{
    VSTRING *buf = vstring_alloc(100);
    off_t   curr_offset;
    int     rec_type;
    long    msg_seg_len;
    long    data_offset;
    long    rcpt_count;
    long    qmgr_opts;

    if (state->dst != 0) {
	msg_warn("closing %s", cleanup_path);
	vstream_fclose(state->dst);
	state->dst = 0;
	myfree(cleanup_path);
	cleanup_path = 0;
    }
    if ((state->dst = vstream_fopen(path, O_RDWR, 0)) == 0) {
	msg_warn("open %s: %m", path);
    } else {
	cleanup_path = mystrdup(path);
	for (;;) {
	    if ((curr_offset = vstream_ftell(state->dst)) < 0)
		msg_fatal("file %s: vstream_ftell: %m", cleanup_path);
	    if ((rec_type = rec_get_raw(state->dst, buf, 0, REC_FLAG_NONE)) < 0)
		msg_fatal("file %s: missing SIZE or PTR record", cleanup_path);
	    if (rec_type == REC_TYPE_SIZE) {
		if (sscanf(STR(buf), "%ld %ld %ld %ld",
			   &msg_seg_len, &data_offset,
			   &rcpt_count, &qmgr_opts) != 4)
		    msg_fatal("file %s: bad SIZE record: %s",
			      cleanup_path, STR(buf));
		state->data_offset = data_offset;
		state->xtra_offset = data_offset + msg_seg_len;
	    } else if (rec_type == REC_TYPE_FROM) {
		state->sender_pt_offset = curr_offset;
		if (LEN(buf) < REC_TYPE_PTR_PAYL_SIZE
		    && rec_get_raw(state->dst, buf, 0, REC_FLAG_NONE) != REC_TYPE_PTR)
		    msg_fatal("file %s: missing PTR record after short sender",
			      cleanup_path);
		if ((state->sender_pt_target = vstream_ftell(state->dst)) < 0)
		    msg_fatal("file %s: missing END record", cleanup_path);
	    } else if (rec_type == REC_TYPE_PTR) {
		if (state->data_offset < 0)
		    msg_fatal("file %s: missing SIZE record", cleanup_path);
		if (curr_offset < state->data_offset
		    || curr_offset > state->xtra_offset) {
		    if (state->append_rcpt_pt_offset < 0) {
			state->append_rcpt_pt_offset = curr_offset;
			if (atol(STR(buf)) != 0)
			    msg_fatal("file %s: bad dummy recipient PTR record: %s",
				      cleanup_path, STR(buf));
			if ((state->append_rcpt_pt_target =
			     vstream_ftell(state->dst)) < 0)
			    msg_fatal("file %s: vstream_ftell: %m", cleanup_path);
		    } else if (curr_offset > state->xtra_offset
			       && state->append_meta_pt_offset < 0) {
			state->append_meta_pt_offset = curr_offset;
			if (atol(STR(buf)) != 0)
			    msg_fatal("file %s: bad dummy meta PTR record: %s",
				      cleanup_path, STR(buf));
			if ((state->append_meta_pt_target =
			     vstream_ftell(state->dst)) < 0)
			    msg_fatal("file %s: vstream_ftell: %m", cleanup_path);
		    }
		} else {
		    if (state->append_hdr_pt_offset < 0) {
			state->append_hdr_pt_offset = curr_offset;
			if (atol(STR(buf)) != 0)
			    msg_fatal("file %s: bad dummy header PTR record: %s",
				      cleanup_path, STR(buf));
			if ((state->append_hdr_pt_target =
			     vstream_ftell(state->dst)) < 0)
			    msg_fatal("file %s: vstream_ftell: %m", cleanup_path);
		    }
		}
	    }
	    if (state->append_rcpt_pt_offset > 0
		&& state->append_hdr_pt_offset > 0
		&& (rec_type == REC_TYPE_END
		    || state->append_meta_pt_offset > 0))
		break;
	}
	if (msg_verbose) {
	    msg_info("append_rcpt_pt_offset %ld append_rcpt_pt_target %ld",
		     (long) state->append_rcpt_pt_offset,
		     (long) state->append_rcpt_pt_target);
	    msg_info("append_hdr_pt_offset %ld append_hdr_pt_target %ld",
		     (long) state->append_hdr_pt_offset,
		     (long) state->append_hdr_pt_target);
	}
    }
    vstring_free(buf);
}

static void close_queue_file(CLEANUP_STATE *state)
{
    (void) vstream_fclose(state->dst);
    state->dst = 0;
    myfree(cleanup_path);
    cleanup_path = 0;
}

int     main(int unused_argc, char **argv)
{
    VSTRING *inbuf = vstring_alloc(100);
    VSTRING *arg_buf = vstring_alloc(100);
    char   *bufp;
    int     istty = isatty(vstream_fileno(VSTREAM_IN));
    CLEANUP_STATE *state = cleanup_state_alloc((VSTREAM *) 0);
    const char *parens = "{}";

    state->queue_id = mystrdup("NOQUEUE");
    state->sender = mystrdup("sender");
    state->recip = mystrdup("recipient");
    state->client_name = "client_name";
    state->client_addr = "client_addr";
    state->flags |= CLEANUP_FLAG_FILTER_ALL;

    msg_vstream_init(argv[0], VSTREAM_ERR);
    var_line_limit = DEF_LINE_LIMIT;
    var_header_limit = DEF_HEADER_LIMIT;
    var_enable_orcpt = DEF_ENABLE_ORCPT;
    var_info_log_addr_form = DEF_INFO_LOG_ADDR_FORM;

    for (;;) {
	ARGV   *argv;
	ssize_t index;
	const char *resp = 0;

	if (istty) {
	    vstream_printf("- ");
	    vstream_fflush(VSTREAM_OUT);
	}
	if (vstring_fgets_nonl(inbuf, VSTREAM_IN) == 0)
	    break;

	bufp = vstring_str(inbuf);
	if (!istty) {
	    vstream_printf("> %s\n", bufp);
	    vstream_fflush(VSTREAM_OUT);
	}
	if (*bufp == '#' || *bufp == 0 || allspace(bufp))
	    continue;
	argv = argv_splitq(bufp, " ", parens);
	if (argv->argc == 0) {
	    msg_warn("missing command");
	} else if (strcmp(argv->argv[0], "?") == 0) {
	    usage();
	} else if (strcmp(argv->argv[0], "verbose") == 0) {
	    if (argv->argc != 2) {
		msg_warn("bad verbose argument count: %ld", (long) argv->argc);
	    } else if (strcmp(argv->argv[1], "on") == 0) {
		msg_verbose = 2;
	    } else if (strcmp(argv->argv[1], "off") == 0) {
		msg_verbose = 0;
	    } else {
		msg_warn("bad verbose argument");
	    }
	} else if (strcmp(argv->argv[0], "line_length_limit") == 0) {
	    if (argv->argc != 2) {
		msg_warn("bad line_length_limit argument count: %ld",
			 (long) argv->argc);
	    } else if (alldig(argv->argv[1]) == 0) {
		msg_warn("bad line_length_limit argument count: %ld",
			 (long) argv->argc);
	    } else if ((var_line_limit = atoi(argv->argv[1])) < DEF_LINE_LIMIT) {
		msg_warn("bad line_length_limit argument");
	    }
	} else if (strcmp(argv->argv[0], "open") == 0) {
	    if (state->dst != 0) {
		msg_info("closing %s", VSTREAM_PATH(state->dst));
		close_queue_file(state);
	    }
	    if (argv->argc != 2) {
		msg_warn("bad open argument count: %ld", (long) argv->argc);
	    } else {
		open_queue_file(state, argv->argv[1]);
	    }
	} else if (strcmp(argv->argv[0], "enable_original_recipient") == 0) {
	    if (argv->argc == 1) {
		msg_info("enable_original_recipient: %d", var_enable_orcpt);
	    } else if (argv->argc != 2) {
		msg_warn("bad enable_original_recipient argument count: %ld",
			 (long) argv->argc);
	    } else if (!alldig(argv->argv[1])) {
		msg_warn("non-numeric enable_original_recipient argument: %s",
			 argv->argv[1]);
	    } else {
		var_enable_orcpt = atoi(argv->argv[1]);
	    }
	} else if (state->dst == 0) {
	    msg_warn("no open queue file");
	} else if (strcmp(argv->argv[0], "close") == 0) {
	    if (*var_milt_head_checks) {
		cleanup_milter_hbc_finish(state);
		myfree(var_milt_head_checks);
		var_milt_head_checks = "";
		cleanup_milter_header_checks_deinit();
	    }
	    close_queue_file(state);
	} else if (cleanup_milter_hbc_reply && LEN(cleanup_milter_hbc_reply)) {
	    /* Postfix libmilter would skip further requests. */
	    msg_info("ignoring: %s %s %s", argv->argv[0],
		     argv->argc > 1 ? argv->argv[1] : "",
		     argv->argc > 2 ? argv->argv[2] : "");
	} else if (strcmp(argv->argv[0], "add_header") == 0) {
	    if (argv->argc < 2) {
		msg_warn("bad add_header argument count: %ld",
			 (long) argv->argc);
	    } else {
		flatten_args(arg_buf, argv->argv + 2);
		resp = cleanup_add_header(state, argv->argv[1], " ", STR(arg_buf));
	    }
	} else if (strcmp(argv->argv[0], "ins_header") == 0) {
	    if (argv->argc < 3) {
		msg_warn("bad ins_header argument count: %ld",
			 (long) argv->argc);
	    } else if ((index = atoi(argv->argv[1])) < 1) {
		msg_warn("bad ins_header index value");
	    } else {
		flatten_args(arg_buf, argv->argv + 3);
		resp = cleanup_ins_header(state, index, argv->argv[2], " ", STR(arg_buf));
	    }
	} else if (strcmp(argv->argv[0], "upd_header") == 0) {
	    if (argv->argc < 3) {
		msg_warn("bad upd_header argument count: %ld",
			 (long) argv->argc);
	    } else if ((index = atoi(argv->argv[1])) < 1) {
		msg_warn("bad upd_header index value");
	    } else {
		flatten_args(arg_buf, argv->argv + 3);
		resp = cleanup_upd_header(state, index, argv->argv[2], " ", STR(arg_buf));
	    }
	} else if (strcmp(argv->argv[0], "del_header") == 0) {
	    if (argv->argc != 3) {
		msg_warn("bad del_header argument count: %ld",
			 (long) argv->argc);
	    } else if ((index = atoi(argv->argv[1])) < 1) {
		msg_warn("bad del_header index value");
	    } else {
		cleanup_del_header(state, index, argv->argv[2]);
	    }
	} else if (strcmp(argv->argv[0], "chg_from") == 0) {
	    if (argv->argc != 3) {
		msg_warn("bad chg_from argument count: %ld", (long) argv->argc);
	    } else {
		char   *arg = argv->argv[2];
		const char *err;

		if (*arg == parens[0]
		    && (err = extpar(&arg, parens, EXTPAR_FLAG_NONE)) != 0) {
		    msg_warn("%s in \"%s\"", err, arg);
		} else {
		    cleanup_chg_from(state, argv->argv[1], arg);
		}
	    }
	} else if (strcmp(argv->argv[0], "add_rcpt") == 0) {
	    if (argv->argc != 2) {
		msg_warn("bad add_rcpt argument count: %ld", (long) argv->argc);
	    } else {
		cleanup_add_rcpt(state, argv->argv[1]);
	    }
	} else if (strcmp(argv->argv[0], "add_rcpt_par") == 0) {
	    if (argv->argc != 3) {
		msg_warn("bad add_rcpt_par argument count: %ld",
			 (long) argv->argc);
	    } else {
		cleanup_add_rcpt_par(state, argv->argv[1], argv->argv[2]);
	    }
	} else if (strcmp(argv->argv[0], "del_rcpt") == 0) {
	    if (argv->argc != 2) {
		msg_warn("bad del_rcpt argument count: %ld", (long) argv->argc);
	    } else {
		cleanup_del_rcpt(state, argv->argv[1]);
	    }
	} else if (strcmp(argv->argv[0], "replbody") == 0) {
	    if (argv->argc != 2) {
		msg_warn("bad replbody argument count: %ld", (long) argv->argc);
	    } else {
		VSTREAM *fp;
		VSTRING *buf;

		if ((fp = vstream_fopen(argv->argv[1], O_RDONLY, 0)) == 0) {
		    msg_warn("open %s file: %m", argv->argv[1]);
		} else {
		    buf = vstring_alloc(100);
		    cleanup_repl_body(state, MILTER_BODY_START,
				      REC_TYPE_NORM, buf);
		    while (vstring_get_nonl(buf, fp) != VSTREAM_EOF)
			cleanup_repl_body(state, MILTER_BODY_LINE,
					  REC_TYPE_NORM, buf);
		    cleanup_repl_body(state, MILTER_BODY_END,
				      REC_TYPE_NORM, buf);
		    vstring_free(buf);
		    vstream_fclose(fp);
		}
	    }
	} else if (strcmp(argv->argv[0], "header_checks") == 0) {
	    if (argv->argc != 2) {
		msg_warn("bad header_checks argument count: %ld",
			 (long) argv->argc);
	    } else if (*var_milt_head_checks) {
		msg_warn("can't change header checks");
	    } else {
		var_milt_head_checks = mystrdup(argv->argv[1]);
		cleanup_milter_header_checks_init();
	    }
	} else if (strcmp(argv->argv[0], "sender_bcc_maps") == 0) {
	    if (argv->argc != 2) {
		msg_warn("bad sender_bcc_maps argument count: %ld",
			 (long) argv->argc);
	    } else {
		if (cleanup_send_bcc_maps)
		    maps_free(cleanup_send_bcc_maps);
		cleanup_send_bcc_maps =
		    maps_create("sender_bcc_maps", argv->argv[1],
				DICT_FLAG_LOCK | DICT_FLAG_FOLD_FIX
				| DICT_FLAG_UTF8_REQUEST);
		state->flags |= CLEANUP_FLAG_BCC_OK;
		var_rcpt_delim = "";
	    }
	} else {
	    msg_warn("bad command: %s", argv->argv[0]);
	}
	argv_free(argv);
	if (resp)
	    cleanup_milter_apply(state, "END-OF-MESSAGE", resp);
    }
    vstring_free(inbuf);
    vstring_free(arg_buf);
    if (state->append_meta_pt_offset >= 0) {
	if (state->flags)
	    msg_info("flags = %s", cleanup_strflags(state->flags));
	if (state->errs)
	    msg_info("errs = %s", cleanup_strerror(state->errs));
    }
    cleanup_state_free(state);
    if (*var_milt_head_checks)
	myfree(var_milt_head_checks);

    return (0);
}

#endif