Adding upstream version 4.96.upstream/4.96upstream

Signed-off-by: Daniel Baumann <daniel.baumann@progress-linux.org>

1 files changed, 3629 insertions, 0 deletions

diff --git a/src/sieve.c b/src/sieve.c
new file mode 100644
index 0000000..af3bc9d
--- /dev/null
+++ b/src/sieve.c
@@ -0,0 +1,3629 @@
+/*************************************************
+*     Exim - an Internet mail transport agent    *
+*************************************************/
+
+/*
+ * Copyright (c) The Exim Maintainers 2016 - 2022
+ * Copyright (c) Michael Haardt 2003 - 2015
+ * See the file NOTICE for conditions of use and distribution.
+ */
+
+/* This code was contributed by Michael Haardt. */
+
+
+/* Sieve mail filter. */
+
+#include <ctype.h>
+#include <errno.h>
+#include <limits.h>
+#include <stdlib.h>
+#include <string.h>
+
+#include "exim.h"
+
+#if HAVE_ICONV
+# include <iconv.h>
+#endif
+
+/* Define this for RFC compliant \r\n end-of-line terminators.      */
+/* Undefine it for UNIX-style \n end-of-line terminators (default). */
+#undef RFC_EOL
+
+/* Define this for development of the Sieve extension "encoded-character". */
+#define ENCODED_CHARACTER
+
+/* Define this for development of the Sieve extension "envelope-auth". */
+#undef ENVELOPE_AUTH
+
+/* Define this for development of the Sieve extension "enotify".    */
+#define ENOTIFY
+
+/* Define this for the Sieve extension "subaddress".                */
+#define SUBADDRESS
+
+/* Define this for the Sieve extension "vacation".                  */
+#define VACATION
+
+/* Must be >= 1                                                     */
+#define VACATION_MIN_DAYS 1
+/* Must be >= VACATION_MIN_DAYS, must be > 7, should be > 30        */
+#define VACATION_MAX_DAYS 31
+
+/* Keep this at 75 to accept only RFC compliant MIME words.         */
+/* Increase it if you want to match headers from buggy MUAs.        */
+#define MIMEWORD_LENGTH 75
+
+struct Sieve
+  {
+  const uschar *filter;
+  const uschar *pc;
+  int line;
+  const uschar *errmsg;
+  int keep;
+  int require_envelope;
+  int require_fileinto;
+#ifdef ENCODED_CHARACTER
+  int require_encoded_character;
+#endif
+#ifdef ENVELOPE_AUTH
+  int require_envelope_auth;
+#endif
+#ifdef ENOTIFY
+  int require_enotify;
+  struct Notification *notified;
+#endif
+  const uschar *enotify_mailto_owner;
+#ifdef SUBADDRESS
+  int require_subaddress;
+#endif
+#ifdef VACATION
+  int require_vacation;
+  int vacation_ran;
+#endif
+  const uschar *vacation_directory;
+  const uschar *subaddress;
+  const uschar *useraddress;
+  int require_copy;
+  int require_iascii_numeric;
+  };
+
+enum Comparator { COMP_OCTET, COMP_EN_ASCII_CASEMAP, COMP_ASCII_NUMERIC };
+enum MatchType { MATCH_IS, MATCH_CONTAINS, MATCH_MATCHES };
+#ifdef SUBADDRESS
+enum AddressPart { ADDRPART_USER, ADDRPART_DETAIL, ADDRPART_LOCALPART, ADDRPART_DOMAIN, ADDRPART_ALL };
+#else
+enum AddressPart { ADDRPART_LOCALPART, ADDRPART_DOMAIN, ADDRPART_ALL };
+#endif
+enum RelOp { LT, LE, EQ, GE, GT, NE };
+
+struct String
+  {
+  uschar *character;
+  int length;
+  };
+
+struct Notification
+  {
+  struct String method;
+  struct String importance;
+  struct String message;
+  struct Notification *next;
+  };
+
+/* This should be a complete list of supported extensions, so that an external
+ManageSieve (RFC 5804) program can interrogate the current Exim binary for the
+list of extensions and provide correct information to a client.
+
+We'll emit the list in the order given here; keep it alphabetically sorted, so
+that callers don't get surprised.
+
+List *MUST* end with a NULL.  Which at least makes ifdef-vs-comma easier. */
+
+const uschar *exim_sieve_extension_list[] = {
+  CUS"comparator-i;ascii-numeric",
+  CUS"copy",
+#ifdef ENCODED_CHARACTER
+  CUS"encoded-character",
+#endif
+#ifdef ENOTIFY
+  CUS"enotify",
+#endif
+  CUS"envelope",
+#ifdef ENVELOPE_AUTH
+  CUS"envelope-auth",
+#endif
+  CUS"fileinto",
+#ifdef SUBADDRESS
+  CUS"subaddress",
+#endif
+#ifdef VACATION
+  CUS"vacation",
+#endif
+  NULL
+};
+
+static int eq_asciicase(const struct String *needle, const struct String *haystack, int match_prefix);
+static int parse_test(struct Sieve *filter, int *cond, int exec);
+static int parse_commands(struct Sieve *filter, int exec, address_item **generated);
+
+static uschar str_from_c[]="From";
+static const struct String str_from={ str_from_c, 4 };
+static uschar str_to_c[]="To";
+static const struct String str_to={ str_to_c, 2 };
+static uschar str_cc_c[]="Cc";
+static const struct String str_cc={ str_cc_c, 2 };
+static uschar str_bcc_c[]="Bcc";
+static const struct String str_bcc={ str_bcc_c, 3 };
+#ifdef ENVELOPE_AUTH
+static uschar str_auth_c[]="auth";
+static const struct String str_auth={ str_auth_c, 4 };
+#endif
+static uschar str_sender_c[]="Sender";
+static const struct String str_sender={ str_sender_c, 6 };
+static uschar str_resent_from_c[]="Resent-From";
+static const struct String str_resent_from={ str_resent_from_c, 11 };
+static uschar str_resent_to_c[]="Resent-To";
+static const struct String str_resent_to={ str_resent_to_c, 9 };
+static uschar str_fileinto_c[]="fileinto";
+static const struct String str_fileinto={ str_fileinto_c, 8 };
+static uschar str_envelope_c[]="envelope";
+static const struct String str_envelope={ str_envelope_c, 8 };
+#ifdef ENCODED_CHARACTER
+static uschar str_encoded_character_c[]="encoded-character";
+static const struct String str_encoded_character={ str_encoded_character_c, 17 };
+#endif
+#ifdef ENVELOPE_AUTH
+static uschar str_envelope_auth_c[]="envelope-auth";
+static const struct String str_envelope_auth={ str_envelope_auth_c, 13 };
+#endif
+#ifdef ENOTIFY
+static uschar str_enotify_c[]="enotify";
+static const struct String str_enotify={ str_enotify_c, 7 };
+static uschar str_online_c[]="online";
+static const struct String str_online={ str_online_c, 6 };
+static uschar str_maybe_c[]="maybe";
+static const struct String str_maybe={ str_maybe_c, 5 };
+static uschar str_auto_submitted_c[]="Auto-Submitted";
+static const struct String str_auto_submitted={ str_auto_submitted_c, 14 };
+#endif
+#ifdef SUBADDRESS
+static uschar str_subaddress_c[]="subaddress";
+static const struct String str_subaddress={ str_subaddress_c, 10 };
+#endif
+#ifdef VACATION
+static uschar str_vacation_c[]="vacation";
+static const struct String str_vacation={ str_vacation_c, 8 };
+static uschar str_subject_c[]="Subject";
+static const struct String str_subject={ str_subject_c, 7 };
+#endif
+static uschar str_copy_c[]="copy";
+static const struct String str_copy={ str_copy_c, 4 };
+static uschar str_iascii_casemap_c[]="i;ascii-casemap";
+static const struct String str_iascii_casemap={ str_iascii_casemap_c, 15 };
+static uschar str_enascii_casemap_c[]="en;ascii-casemap";
+static const struct String str_enascii_casemap={ str_enascii_casemap_c, 16 };
+static uschar str_ioctet_c[]="i;octet";
+static const struct String str_ioctet={ str_ioctet_c, 7 };
+static uschar str_iascii_numeric_c[]="i;ascii-numeric";
+static const struct String str_iascii_numeric={ str_iascii_numeric_c, 15 };
+static uschar str_comparator_iascii_casemap_c[]="comparator-i;ascii-casemap";
+static const struct String str_comparator_iascii_casemap={ str_comparator_iascii_casemap_c, 26 };
+static uschar str_comparator_enascii_casemap_c[]="comparator-en;ascii-casemap";
+static const struct String str_comparator_enascii_casemap={ str_comparator_enascii_casemap_c, 27 };
+static uschar str_comparator_ioctet_c[]="comparator-i;octet";
+static const struct String str_comparator_ioctet={ str_comparator_ioctet_c, 18 };
+static uschar str_comparator_iascii_numeric_c[]="comparator-i;ascii-numeric";
+static const struct String str_comparator_iascii_numeric={ str_comparator_iascii_numeric_c, 26 };
+
+
+/*************************************************
+*          Encode to quoted-printable            *
+*************************************************/
+
+/*
+Arguments:
+  src               UTF-8 string
+  dst               US-ASCII string
+
+Returns
+  dst
+*/
+
+static struct String *
+quoted_printable_encode(const struct String *src, struct String *dst)
+{
+uschar *new = NULL;
+uschar ch;
+size_t line;
+
+/* Two passes: one to count output allocation size, second
+to do the encoding */
+
+for (int pass = 0; pass <= 1; pass++)
+  {
+  line=0;
+  if (pass==0)
+    dst->length=0;
+  else
+    {
+    dst->character = store_get(dst->length+1, src->character); /* plus one for \0 */
+    new=dst->character;
+    }
+  for (const uschar * start = src->character, * end = start + src->length;
+       start < end; ++start)
+    {
+    ch=*start;
+    if (line>=73)	/* line length limit */
+      {
+      if (pass==0)
+        dst->length+=2;
+      else
+        {
+        *new++='=';	/* line split */
+        *new++='\n';
+        }
+      line=0;
+      }
+    if (  (ch>='!' && ch<='<')
+       || (ch>='>' && ch<='~')
+       || (  (ch=='\t' || ch==' ')
+          && start+2<end
+          && (*(start+1)!='\r' || *(start+2)!='\n')	/* CRLF */
+          )
+       )
+      {
+      if (pass==0)
+        ++dst->length;
+      else
+        *new++=*start;	/* copy char */
+      ++line;
+      }
+    else if (ch=='\r' && start+1<end && *(start+1)=='\n') /* CRLF */
+      {
+      if (pass==0)
+        ++dst->length;
+      else
+        *new++='\n';					/* NL */
+      line=0;
+      ++start;	/* consume extra input char */
+      }
+    else
+      {
+      if (pass==0)
+        dst->length+=3;
+      else
+        {		/* encoded char */
+        new += sprintf(CS new,"=%02X",ch);
+        }
+      line+=3;
+      }
+    }
+  }
+  *new='\0'; /* not included in length, but nice */
+  return dst;
+}
+
+
+/*************************************************
+*     Check mail address for correct syntax      *
+*************************************************/
+
+/*
+Check mail address for being syntactically correct.
+
+Arguments:
+  filter      points to the Sieve filter including its state
+  address     String containing one address
+
+Returns
+  1           Mail address is syntactically OK
+ -1           syntax error
+*/
+
+int check_mail_address(struct Sieve *filter, const struct String *address)
+{
+int start, end, domain;
+uschar *error,*ss;
+
+if (address->length>0)
+  {
+  ss = parse_extract_address(address->character, &error, &start, &end, &domain,
+    FALSE);
+  if (!ss)
+    {
+    filter->errmsg=string_sprintf("malformed address \"%s\" (%s)",
+      address->character, error);
+    return -1;
+    }
+  else
+    return 1;
+  }
+else
+  {
+  filter->errmsg=CUS "empty address";
+  return -1;
+  }
+}
+
+
+/*************************************************
+*          Decode URI encoded string             *
+*************************************************/
+
+/*
+Arguments:
+  str               URI encoded string
+
+Returns
+  0                 Decoding successful
+ -1                 Encoding error
+*/
+
+#ifdef ENOTIFY
+static int
+uri_decode(struct String *str)
+{
+uschar *s,*t,*e;
+
+if (str->length==0) return 0;
+for (s=str->character,t=s,e=s+str->length; s<e; )
+  if (*s=='%')
+    {
+    if (s+2<e && isxdigit(*(s+1)) && isxdigit(*(s+2)))
+      {
+      *t++=((isdigit(*(s+1)) ? *(s+1)-'0' : tolower(*(s+1))-'a'+10)<<4)
+           | (isdigit(*(s+2)) ? *(s+2)-'0' : tolower(*(s+2))-'a'+10);
+      s+=3;
+      }
+    else return -1;
+    }
+  else
+    *t++=*s++;
+
+*t='\0';
+str->length=t-str->character;
+return 0;
+}
+
+
+/*************************************************
+*               Parse mailto URI                 *
+*************************************************/
+
+/*
+Parse mailto-URI.
+
+       mailtoURI   = "mailto:" [ to ] [ headers ]
+       to          = [ addr-spec *("%2C" addr-spec ) ]
+       headers     = "?" header *( "&" header )
+       header      = hname "=" hvalue
+       hname       = *urlc
+       hvalue      = *urlc
+
+Arguments:
+  filter      points to the Sieve filter including its state
+  uri         URI, excluding scheme
+  recipient
+  body
+
+Returns
+  1           URI is syntactically OK
+  0           Unknown URI scheme
+ -1           syntax error
+*/
+
+static int
+parse_mailto_uri(struct Sieve *filter, const uschar *uri,
+  string_item **recipient, struct String *header, struct String *subject,
+  struct String *body)
+{
+const uschar *start;
+struct String to, hname;
+struct String hvalue = {.character = NULL, .length = 0};
+string_item *new;
+
+if (Ustrncmp(uri,"mailto:",7))
+  {
+  filter->errmsg=US "Unknown URI scheme";
+  return 0;
+  }
+
+uri+=7;
+if (*uri && *uri!='?')
+  for (;;)
+    {
+    /* match to */
+    for (start=uri; *uri && *uri!='?' && (*uri!='%' || *(uri+1)!='2' || tolower(*(uri+2))!='c'); ++uri);
+    if (uri>start)
+      {
+      gstring * g = string_catn(NULL, start, uri-start);
+
+      to.character = string_from_gstring(g);
+      to.length = g->ptr;
+      if (uri_decode(&to)==-1)
+        {
+        filter->errmsg=US"Invalid URI encoding";
+        return -1;
+        }
+      new = store_get(sizeof(string_item), GET_UNTAINTED);
+      new->text = store_get(to.length+1, to.character);
+      if (to.length) memcpy(new->text, to.character, to.length);
+      new->text[to.length] = '\0';
+      new->next = *recipient;
+      *recipient = new;
+      }
+    else
+      {
+      filter->errmsg = US"Missing addr-spec in URI";
+      return -1;
+      }
+    if (*uri=='%') uri+=3;
+    else break;
+    }
+if (*uri=='?')
+  {
+  ++uri;
+  for (;;)
+    {
+    /* match hname */
+    for (start=uri; *uri && (isalnum(*uri) || strchr("$-_.+!*'(),%",*uri)); ++uri);
+    if (uri>start)
+      {
+      gstring * g = string_catn(NULL, start, uri-start);
+
+      hname.character = string_from_gstring(g);
+      hname.length = g->ptr;
+      if (uri_decode(&hname)==-1)
+        {
+        filter->errmsg=US"Invalid URI encoding";
+        return -1;
+        }
+      }
+    /* match = */
+    if (*uri=='=')
+      ++uri;
+    else
+      {
+      filter->errmsg=US"Missing equal after hname";
+      return -1;
+      }
+    /* match hvalue */
+    for (start=uri; *uri && (isalnum(*uri) || strchr("$-_.+!*'(),%",*uri)); ++uri);
+    if (uri>start)
+      {
+      gstring * g = string_catn(NULL, start, uri-start);
+
+      hname.character = string_from_gstring(g);
+      hname.length = g->ptr;
+      if (uri_decode(&hvalue)==-1)
+        {
+        filter->errmsg=US"Invalid URI encoding";
+        return -1;
+        }
+      }
+    if (hname.length==2 && strcmpic(hname.character, US"to")==0)
+      {
+      new=store_get(sizeof(string_item), GET_UNTAINTED);
+      new->text = store_get(hvalue.length+1, hvalue.character);
+      if (hvalue.length) memcpy(new->text, hvalue.character, hvalue.length);
+      new->text[hvalue.length]='\0';
+      new->next=*recipient;
+      *recipient=new;
+      }
+    else if (hname.length==4 && strcmpic(hname.character, US"body")==0)
+      *body=hvalue;
+    else if (hname.length==7 && strcmpic(hname.character, US"subject")==0)
+      *subject=hvalue;
+    else
+      {
+      static struct String ignore[]=
+        {
+        {US"date",4},
+        {US"from",4},
+        {US"message-id",10},
+        {US"received",8},
+        {US"auto-submitted",14}
+        };
+      static struct String *end=ignore+sizeof(ignore)/sizeof(ignore[0]);
+      struct String *i;
+
+      for (i=ignore; i<end && !eq_asciicase(&hname,i,0); ++i);
+      if (i==end)
+        {
+	gstring * g;
+
+        if (header->length==-1) header->length = 0;
+
+	g = string_catn(NULL, header->character, header->length);
+        g = string_catn(g, hname.character, hname.length);
+        g = string_catn(g, CUS ": ", 2);
+        g = string_catn(g, hvalue.character, hvalue.length);
+        g = string_catn(g, CUS "\n", 1);
+
+	header->character = string_from_gstring(g);
+	header->length = g->ptr;
+        }
+      }
+    if (*uri=='&') ++uri;
+    else break;
+    }
+  }
+if (*uri)
+  {
+  filter->errmsg=US"Syntactically invalid URI";
+  return -1;
+  }
+return 1;
+}
+#endif
+
+
+/*************************************************
+*          Octet-wise string comparison          *
+*************************************************/
+
+/*
+Arguments:
+  needle            UTF-8 string to search ...
+  haystack          ... inside the haystack
+  match_prefix      1 to compare if needle is a prefix of haystack
+
+Returns:      0               needle not found in haystack
+              1               needle found
+*/
+
+static int eq_octet(const struct String *needle,
+  const struct String *haystack, int match_prefix)
+{
+size_t nl,hl;
+const uschar *n,*h;
+
+nl=needle->length;
+n=needle->character;
+hl=haystack->length;
+h=haystack->character;
+while (nl>0 && hl>0)
+  {
+#if !HAVE_ICONV
+  if (*n&0x80) return 0;
+  if (*h&0x80) return 0;
+#endif
+  if (*n!=*h) return 0;
+  ++n;
+  ++h;
+  --nl;
+  --hl;
+  }
+return (match_prefix ? nl==0 : nl==0 && hl==0);
+}
+
+
+/*************************************************
+*    ASCII case-insensitive string comparison    *
+*************************************************/
+
+/*
+Arguments:
+  needle            UTF-8 string to search ...
+  haystack          ... inside the haystack
+  match_prefix      1 to compare if needle is a prefix of haystack
+
+Returns:      0               needle not found in haystack
+              1               needle found
+*/
+
+static int eq_asciicase(const struct String *needle,
+  const struct String *haystack, int match_prefix)
+{
+size_t nl,hl;
+const uschar *n,*h;
+uschar nc,hc;
+
+nl=needle->length;
+n=needle->character;
+hl=haystack->length;
+h=haystack->character;
+while (nl>0 && hl>0)
+  {
+  nc=*n;
+  hc=*h;
+#if !HAVE_ICONV
+  if (nc&0x80) return 0;
+  if (hc&0x80) return 0;
+#endif
+  /* tolower depends on the locale and only ASCII case must be insensitive */
+  if ((nc>='A' && nc<='Z' ? nc|0x20 : nc) != (hc>='A' && hc<='Z' ? hc|0x20 : hc)) return 0;
+  ++n;
+  ++h;
+  --nl;
+  --hl;
+  }
+return (match_prefix ? nl==0 : nl==0 && hl==0);
+}
+
+
+/*************************************************
+*              Glob pattern search               *
+*************************************************/
+
+/*
+Arguments:
+  needle          pattern to search ...
+  haystack        ... inside the haystack
+  ascii_caseless  ignore ASCII case
+  match_octet     match octets, not UTF-8 multi-octet characters
+
+Returns:      0               needle not found in haystack
+              1               needle found
+              -1              pattern error
+*/
+
+static int eq_glob(const struct String *needle,
+  const struct String *haystack, int ascii_caseless, int match_octet)
+{
+const uschar *n,*h,*nend,*hend;
+int may_advance=0;
+
+n=needle->character;
+h=haystack->character;
+nend=n+needle->length;
+hend=h+haystack->length;
+while (n<nend)
+  {
+  if (*n=='*')
+    {
+    ++n;
+    may_advance=1;
+    }
+  else
+    {
+    const uschar *npart,*hpart;
+
+    /* Try to match a non-star part of the needle at the current */
+    /* position in the haystack.                                 */
+    match_part:
+    npart=n;
+    hpart=h;
+    while (npart<nend && *npart!='*') switch (*npart)
+      {
+      case '?':
+        {
+        if (hpart==hend) return 0;
+        if (match_octet)
+          ++hpart;
+        else
+          {
+          /* Match one UTF8 encoded character */
+          if ((*hpart&0xc0)==0xc0)
+            {
+            ++hpart;
+            while (hpart<hend && ((*hpart&0xc0)==0x80)) ++hpart;
+            }
+          else
+            ++hpart;
+          }
+        ++npart;
+        break;
+        }
+      case '\\':
+        {
+        ++npart;
+        if (npart==nend) return -1;
+        /* FALLTHROUGH */
+        }
+      default:
+        {
+        if (hpart==hend) return 0;
+        /* tolower depends on the locale, but we need ASCII */
+        if
+          (
+#if !HAVE_ICONV
+          (*hpart&0x80) || (*npart&0x80) ||
+#endif
+          ascii_caseless
+          ? ((*npart>='A' && *npart<='Z' ? *npart|0x20 : *npart) != (*hpart>='A' && *hpart<='Z' ? *hpart|0x20 : *hpart))
+          : *hpart!=*npart
+          )
+          {
+          if (may_advance)
+            /* string match after a star failed, advance and try again */
+            {
+            ++h;
+            goto match_part;
+            }
+          else return 0;
+          }
+        else
+          {
+          ++npart;
+          ++hpart;
+          };
+        }
+      }
+    /* at this point, a part was matched successfully */
+    if (may_advance && npart==nend && hpart<hend)
+      /* needle ends, but haystack does not: if there was a star before, advance and try again */
+      {
+      ++h;
+      goto match_part;
+      }
+    h=hpart;
+    n=npart;
+    may_advance=0;
+    }
+  }
+return (h==hend ? 1 : may_advance);
+}
+
+
+/*************************************************
+*    ASCII numeric comparison                    *
+*************************************************/
+
+/*
+Arguments:
+  a                 first numeric string
+  b                 second numeric string
+  relop             relational operator
+
+Returns:      0               not (a relop b)
+              1               a relop b
+*/
+
+static int eq_asciinumeric(const struct String *a,
+  const struct String *b, enum RelOp relop)
+{
+size_t al,bl;
+const uschar *as,*aend,*bs,*bend;
+int cmp;
+
+as=a->character;
+aend=a->character+a->length;
+bs=b->character;
+bend=b->character+b->length;
+
+while (*as>='0' && *as<='9' && as<aend) ++as;
+al=as-a->character;
+while (*bs>='0' && *bs<='9' && bs<bend) ++bs;
+bl=bs-b->character;
+
+if (al && bl==0) cmp=-1;
+else if (al==0 && bl==0) cmp=0;
+else if (al==0 && bl) cmp=1;
+else
+  {
+  cmp=al-bl;
+  if (cmp==0) cmp=memcmp(a->character,b->character,al);
+  }
+switch (relop)
+  {
+  case LT: return cmp<0;
+  case LE: return cmp<=0;
+  case EQ: return cmp==0;
+  case GE: return cmp>=0;
+  case GT: return cmp>0;
+  case NE: return cmp!=0;
+  }
+  /*NOTREACHED*/
+  return -1;
+}
+
+
+/*************************************************
+*             Compare strings                    *
+*************************************************/
+
+/*
+Arguments:
+  filter      points to the Sieve filter including its state
+  needle      UTF-8 pattern or string to search ...
+  haystack    ... inside the haystack
+  co          comparator to use
+  mt          match type to use
+
+Returns:      0               needle not found in haystack
+              1               needle found
+              -1              comparator does not offer matchtype
+*/
+
+static int compare(struct Sieve *filter, const struct String *needle, const struct String *haystack,
+  enum Comparator co, enum MatchType mt)
+{
+int r=0;
+
+if ((filter_test != FTEST_NONE && debug_selector != 0) ||
+  (debug_selector & D_filter) != 0)
+  {
+  debug_printf("String comparison (match ");
+  switch (mt)
+    {
+    case MATCH_IS: debug_printf(":is"); break;
+    case MATCH_CONTAINS: debug_printf(":contains"); break;
+    case MATCH_MATCHES: debug_printf(":matches"); break;
+    }
+  debug_printf(", comparison \"");
+  switch (co)
+    {
+    case COMP_OCTET: debug_printf("i;octet"); break;
+    case COMP_EN_ASCII_CASEMAP: debug_printf("en;ascii-casemap"); break;
+    case COMP_ASCII_NUMERIC: debug_printf("i;ascii-numeric"); break;
+    }
+  debug_printf("\"):\n");
+  debug_printf("  Search = %s (%d chars)\n", needle->character,needle->length);
+  debug_printf("  Inside = %s (%d chars)\n", haystack->character,haystack->length);
+  }
+switch (mt)
+  {
+  case MATCH_IS:
+    switch (co)
+      {
+      case COMP_OCTET:
+        if (eq_octet(needle,haystack,0)) r=1;
+        break;
+      case COMP_EN_ASCII_CASEMAP:
+        if (eq_asciicase(needle,haystack,0)) r=1;
+        break;
+      case COMP_ASCII_NUMERIC:
+        if (!filter->require_iascii_numeric)
+          {
+          filter->errmsg=CUS "missing previous require \"comparator-i;ascii-numeric\";";
+          return -1;
+          }
+        if (eq_asciinumeric(needle,haystack,EQ)) r=1;
+        break;
+      }
+    break;
+
+  case MATCH_CONTAINS:
+    {
+    struct String h;
+
+    switch (co)
+      {
+      case COMP_OCTET:
+        for (h = *haystack; h.length; ++h.character,--h.length)
+	 if (eq_octet(needle,&h,1)) { r=1; break; }
+        break;
+      case COMP_EN_ASCII_CASEMAP:
+        for (h = *haystack; h.length; ++h.character, --h.length)
+	  if (eq_asciicase(needle,&h,1)) { r=1; break; }
+        break;
+      default:
+        filter->errmsg=CUS "comparator does not offer specified matchtype";
+        return -1;
+      }
+    break;
+    }
+
+  case MATCH_MATCHES:
+    switch (co)
+      {
+      case COMP_OCTET:
+        if ((r=eq_glob(needle,haystack,0,1))==-1)
+          {
+          filter->errmsg=CUS "syntactically invalid pattern";
+          return -1;
+          }
+        break;
+      case COMP_EN_ASCII_CASEMAP:
+        if ((r=eq_glob(needle,haystack,1,1))==-1)
+          {
+          filter->errmsg=CUS "syntactically invalid pattern";
+          return -1;
+          }
+        break;
+      default:
+        filter->errmsg=CUS "comparator does not offer specified matchtype";
+        return -1;
+      }
+    break;
+  }
+if ((filter_test != FTEST_NONE && debug_selector != 0) ||
+  (debug_selector & D_filter) != 0)
+  debug_printf("  Result %s\n",r?"true":"false");
+return r;
+}
+
+
+/*************************************************
+*         Check header field syntax              *
+*************************************************/
+
+/*
+RFC 2822, section 3.6.8 says:
+
+  field-name      =       1*ftext
+
+  ftext           =       %d33-57 /               ; Any character except
+                          %d59-126                ;  controls, SP, and
+                                                  ;  ":".
+
+That forbids 8-bit header fields.  This implementation accepts them, since
+all of Exim is 8-bit clean, so it adds %d128-%d255.
+
+Arguments:
+  header      header field to quote for suitable use in Exim expansions
+
+Returns:      0               string is not a valid header field
+              1               string is a value header field
+*/
+
+static int is_header(const struct String *header)
+{
+size_t l;
+const uschar *h;
+
+l=header->length;
+h=header->character;
+if (l==0) return 0;
+while (l)
+  {
+  if (((unsigned char)*h)<33 || ((unsigned char)*h)==':' || ((unsigned char)*h)==127) return 0;
+  else
+    {
+    ++h;
+    --l;
+    }
+  }
+return 1;
+}
+
+
+/*************************************************
+*       Quote special characters string          *
+*************************************************/
+
+/*
+Arguments:
+  header      header field to quote for suitable use in Exim expansions
+              or as debug output
+
+Returns:      quoted string
+*/
+
+static const uschar *
+quote(const struct String *header)
+{
+gstring * quoted = NULL;
+size_t l;
+const uschar *h;
+
+l=header->length;
+h=header->character;
+while (l)
+  {
+  switch (*h)
+    {
+    case '\0':
+      quoted = string_catn(quoted, CUS "\\0", 2);
+      break;
+    case '$':
+    case '{':
+    case '}':
+      quoted = string_catn(quoted, CUS "\\", 1);
+    default:
+      quoted = string_catn(quoted, h, 1);
+    }
+  ++h;
+  --l;
+  }
+quoted = string_catn(quoted, CUS "", 1);
+return string_from_gstring(quoted);
+}
+
+
+/*************************************************
+*   Add address to list of generated addresses   *
+*************************************************/
+
+/*
+According to RFC 5228, duplicate delivery to the same address must
+not happen, so the list is first searched for the address.
+
+Arguments:
+  generated   list of generated addresses
+  addr        new address to add
+  file        address denotes a file
+
+Returns:      nothing
+*/
+
+static void
+add_addr(address_item **generated, uschar *addr, int file, int maxage, int maxmessages, int maxstorage)
+{
+address_item *new_addr;
+
+for (new_addr = *generated; new_addr; new_addr = new_addr->next)
+  if (  Ustrcmp(new_addr->address,addr) == 0
+     && (  !file
+	|| testflag(new_addr, af_pfr)
+	|| testflag(new_addr, af_file)
+	)
+     )
+    {
+    if ((filter_test != FTEST_NONE && debug_selector != 0) || (debug_selector & D_filter) != 0)
+      debug_printf("Repeated %s `%s' ignored.\n",file ? "fileinto" : "redirect", addr);
+
+    return;
+    }
+
+if ((filter_test != FTEST_NONE && debug_selector != 0) || (debug_selector & D_filter) != 0)
+  debug_printf("%s `%s'\n",file ? "fileinto" : "redirect", addr);
+
+new_addr = deliver_make_addr(addr,TRUE);
+if (file)
+  {
+  setflag(new_addr, af_pfr);
+  setflag(new_addr, af_file);
+  new_addr->mode = 0;
+  }
+new_addr->prop.errors_address = NULL;
+new_addr->next = *generated;
+*generated = new_addr;
+}
+
+
+/*************************************************
+*         Return decoded header field            *
+*************************************************/
+
+/*
+Unfold the header field as described in RFC 2822 and remove all
+leading and trailing white space, then perform MIME decoding and
+translate the header field to UTF-8.
+
+Arguments:
+  value       returned value of the field
+  header      name of the header field
+
+Returns:      nothing          The expanded string is empty
+                               in case there is no such header
+*/
+
+static void expand_header(struct String *value, const struct String *header)
+{
+uschar *s,*r,*t;
+uschar *errmsg;
+
+value->length=0;
+value->character=(uschar*)0;
+
+t = r = s = expand_string(string_sprintf("$rheader_%s",quote(header)));
+if (!t) return;
+while (*r==' ' || *r=='\t') ++r;
+while (*r)
+  {
+  if (*r=='\n')
+    ++r;
+  else
+    *t++=*r++;
+  }
+while (t>s && (*(t-1)==' ' || *(t-1)=='\t')) --t;
+*t='\0';
+value->character=rfc2047_decode(s,check_rfc2047_length,US"utf-8",'\0',&value->length,&errmsg);
+}
+
+
+/*************************************************
+*        Parse remaining hash comment            *
+*************************************************/
+
+/*
+Token definition:
+  Comment up to terminating CRLF
+
+Arguments:
+  filter      points to the Sieve filter including its state
+
+Returns:      1                success
+              -1               syntax error
+*/
+
+static int parse_hashcomment(struct Sieve *filter)
+{
+++filter->pc;
+while (*filter->pc)
+  {
+#ifdef RFC_EOL
+  if (*filter->pc=='\r' && *(filter->pc+1)=='\n')
+#else
+  if (*filter->pc=='\n')
+#endif
+    {
+#ifdef RFC_EOL
+    filter->pc+=2;
+#else
+    ++filter->pc;
+#endif
+    ++filter->line;
+    return 1;
+    }
+  else ++filter->pc;
+  }
+filter->errmsg=CUS "missing end of comment";
+return -1;
+}
+
+
+/*************************************************
+*       Parse remaining C-style comment          *
+*************************************************/
+
+/*
+Token definition:
+  Everything up to star slash
+
+Arguments:
+  filter      points to the Sieve filter including its state
+
+Returns:      1                success
+              -1               syntax error
+*/
+
+static int parse_comment(struct Sieve *filter)
+{
+  filter->pc+=2;
+  while (*filter->pc)
+  {
+    if (*filter->pc=='*' && *(filter->pc+1)=='/')
+    {
+      filter->pc+=2;
+      return 1;
+    }
+    else ++filter->pc;
+  }
+  filter->errmsg=CUS "missing end of comment";
+  return -1;
+}
+
+
+/*************************************************
+*         Parse optional white space             *
+*************************************************/
+
+/*
+Token definition:
+  Spaces, tabs, CRLFs, hash comments or C-style comments
+
+Arguments:
+  filter      points to the Sieve filter including its state
+
+Returns:      1                success
+              -1               syntax error
+*/
+
+static int parse_white(struct Sieve *filter)
+{
+while (*filter->pc)
+  {
+  if (*filter->pc==' ' || *filter->pc=='\t') ++filter->pc;
+#ifdef RFC_EOL
+  else if (*filter->pc=='\r' && *(filter->pc+1)=='\n')
+#else
+  else if (*filter->pc=='\n')
+#endif
+    {
+#ifdef RFC_EOL
+    filter->pc+=2;
+#else
+    ++filter->pc;
+#endif
+    ++filter->line;
+    }
+  else if (*filter->pc=='#')
+    {
+    if (parse_hashcomment(filter)==-1) return -1;
+    }
+  else if (*filter->pc=='/' && *(filter->pc+1)=='*')
+    {
+    if (parse_comment(filter)==-1) return -1;
+    }
+  else break;
+  }
+return 1;
+}
+
+
+#ifdef ENCODED_CHARACTER
+/*************************************************
+*      Decode hex-encoded-character string       *
+*************************************************/
+
+/*
+Encoding definition:
+   blank                = SP / TAB / CRLF
+   hex-pair-seq         = *blank hex-pair *(1*blank hex-pair) *blank
+   hex-pair             = 1*2HEXDIG
+
+Arguments:
+  src         points to a hex-pair-seq
+  end         points to its end
+  dst         points to the destination of the decoded octets,
+              optionally to (uschar*)0 for checking only
+
+Returns:      >=0              number of decoded octets
+              -1               syntax error
+*/
+
+static int hex_decode(uschar *src, uschar *end, uschar *dst)
+{
+int decoded=0;
+
+while (*src==' ' || *src=='\t' || *src=='\n') ++src;
+do
+  {
+  int x,d,n;
+
+  for (x = 0, d = 0;
+      d<2 && src<end && isxdigit(n=tolower(*src));
+      x=(x<<4)|(n>='0' && n<='9' ? n-'0' : 10+(n-'a')) ,++d, ++src) ;
+  if (d==0) return -1;
+  if (dst) *dst++=x;
+  ++decoded;
+  if (src==end) return decoded;
+  if (*src==' ' || *src=='\t' || *src=='\n')
+    while (*src==' ' || *src=='\t' || *src=='\n') ++src;
+  else
+    return -1;
+  }
+while (src<end);
+return decoded;
+}
+
+
+/*************************************************
+*    Decode unicode-encoded-character string     *
+*************************************************/
+
+/*
+Encoding definition:
+   blank                = SP / TAB / CRLF
+   unicode-hex-seq      = *blank unicode-hex *(blank unicode-hex) *blank
+   unicode-hex          = 1*HEXDIG
+
+   It is an error for a script to use a hexadecimal value that isn't in
+   either the range 0 to D7FF or the range E000 to 10FFFF.
+
+   At this time, strings are already scanned, thus the CRLF is converted
+   to the internally used \n (should RFC_EOL have been used).
+
+Arguments:
+  src         points to a unicode-hex-seq
+  end         points to its end
+  dst         points to the destination of the decoded octets,
+              optionally to (uschar*)0 for checking only
+
+Returns:      >=0              number of decoded octets
+              -1               syntax error
+              -2               semantic error (character range violation)
+*/
+
+static int
+unicode_decode(uschar *src, uschar *end, uschar *dst)
+{
+int decoded=0;
+
+while (*src==' ' || *src=='\t' || *src=='\n') ++src;
+do
+  {
+  uschar *hex_seq;
+  int c,d,n;
+
+  unicode_hex:
+  for (hex_seq = src; src < end && *src=='0'; ) src++;
+  for (c = 0, d = 0;
+       d < 7 && src < end && isxdigit(n=tolower(*src));
+       c=(c<<4)|(n>='0' && n<='9' ? n-'0' : 10+(n-'a')), ++d, ++src) ;
+  if (src == hex_seq) return -1;
+  if (d==7 || (!((c>=0 && c<=0xd7ff) || (c>=0xe000 && c<=0x10ffff)))) return -2;
+  if (c<128)
+    {
+    if (dst) *dst++=c;
+    ++decoded;
+    }
+  else if (c>=0x80 && c<=0x7ff)
+    {
+      if (dst)
+        {
+        *dst++=192+(c>>6);
+        *dst++=128+(c&0x3f);
+        }
+      decoded+=2;
+    }
+  else if (c>=0x800 && c<=0xffff)
+    {
+      if (dst)
+        {
+        *dst++=224+(c>>12);
+        *dst++=128+((c>>6)&0x3f);
+        *dst++=128+(c&0x3f);
+        }
+      decoded+=3;
+    }
+  else if (c>=0x10000 && c<=0x1fffff)
+    {
+      if (dst)
+        {
+        *dst++=240+(c>>18);
+        *dst++=128+((c>>10)&0x3f);
+        *dst++=128+((c>>6)&0x3f);
+        *dst++=128+(c&0x3f);
+        }
+      decoded+=4;
+    }
+  if (*src==' ' || *src=='\t' || *src=='\n')
+    {
+    while (*src==' ' || *src=='\t' || *src=='\n') ++src;
+    if (src==end) return decoded;
+    goto unicode_hex;
+    }
+  }
+while (src<end);
+return decoded;
+}
+
+
+/*************************************************
+*       Decode encoded-character string          *
+*************************************************/
+
+/*
+Encoding definition:
+   encoded-arb-octets   = "${hex:" hex-pair-seq "}"
+   encoded-unicode-char = "${unicode:" unicode-hex-seq "}"
+
+Arguments:
+  encoded     points to an encoded string, returns decoded string
+  filter      points to the Sieve filter including its state
+
+Returns:      1                success
+              -1               syntax error
+*/
+
+static int string_decode(struct Sieve *filter, struct String *data)
+{
+uschar *src,*dst,*end;
+
+src=data->character;
+dst=src;
+end=data->character+data->length;
+while (src<end)
+  {
+  uschar *brace;
+
+  if (
+      strncmpic(src,US "${hex:",6)==0
+      && (brace=Ustrchr(src+6,'}'))!=(uschar*)0
+      && (hex_decode(src+6,brace,(uschar*)0))>=0
+     )
+    {
+    dst+=hex_decode(src+6,brace,dst);
+    src=brace+1;
+    }
+  else if (
+           strncmpic(src,US "${unicode:",10)==0
+           && (brace=Ustrchr(src+10,'}'))!=(uschar*)0
+          )
+    {
+    switch (unicode_decode(src+10,brace,(uschar*)0))
+      {
+      case -2:
+        {
+        filter->errmsg=CUS "unicode character out of range";
+        return -1;
+        }
+      case -1:
+        {
+        *dst++=*src++;
+        break;
+        }
+      default:
+        {
+        dst+=unicode_decode(src+10,brace,dst);
+        src=brace+1;
+        }
+      }
+    }
+  else *dst++=*src++;
+  }
+  data->length=dst-data->character;
+  *dst='\0';
+return 1;
+}
+#endif
+
+
+/*************************************************
+*          Parse an optional string              *
+*************************************************/
+
+/*
+Token definition:
+   quoted-string = DQUOTE *CHAR DQUOTE
+           ;; in general, \ CHAR inside a string maps to CHAR
+           ;; so \" maps to " and \\ maps to \
+           ;; note that newlines and other characters are all allowed
+           ;; in strings
+
+   multi-line          = "text:" *(SP / HTAB) (hash-comment / CRLF)
+                         *(multi-line-literal / multi-line-dotstuff)
+                         "." CRLF
+   multi-line-literal  = [CHAR-NOT-DOT *CHAR-NOT-CRLF] CRLF
+   multi-line-dotstuff = "." 1*CHAR-NOT-CRLF CRLF
+           ;; A line containing only "." ends the multi-line.
+           ;; Remove a leading '.' if followed by another '.'.
+  string           = quoted-string / multi-line
+
+Arguments:
+  filter      points to the Sieve filter including its state
+  id          specifies identifier to match
+
+Returns:      1                success
+              -1               syntax error
+              0                identifier not matched
+*/
+
+static int
+parse_string(struct Sieve *filter, struct String *data)
+{
+gstring * g = NULL;
+
+data->length = 0;
+data->character = NULL;
+
+if (*filter->pc=='"') /* quoted string */
+  {
+  ++filter->pc;
+  while (*filter->pc)
+    {
+    if (*filter->pc=='"') /* end of string */
+      {
+      ++filter->pc;
+
+      if (g)
+	{
+	data->character = string_from_gstring(g);
+	data->length = g->ptr;
+	}
+      else
+	data->character = US"\0";
+      /* that way, there will be at least one character allocated */
+
+#ifdef ENCODED_CHARACTER
+      if (filter->require_encoded_character
+          && string_decode(filter,data)==-1)
+        return -1;
+#endif
+      return 1;
+      }
+    else if (*filter->pc=='\\' && *(filter->pc+1)) /* quoted character */
+      {
+      g = string_catn(g, filter->pc+1, 1);
+      filter->pc+=2;
+      }
+    else /* regular character */
+      {
+#ifdef RFC_EOL
+      if (*filter->pc=='\r' && *(filter->pc+1)=='\n') ++filter->line;
+#else
+      if (*filter->pc=='\n')
+        {
+        g = string_catn(g, US"\r", 1);
+        ++filter->line;
+        }
+#endif
+      g = string_catn(g, filter->pc, 1);
+      filter->pc++;
+      }
+    }
+  filter->errmsg=CUS "missing end of string";
+  return -1;
+  }
+else if (Ustrncmp(filter->pc,CUS "text:",5)==0) /* multiline string */
+  {
+  filter->pc+=5;
+  /* skip optional white space followed by hashed comment or CRLF */
+  while (*filter->pc==' ' || *filter->pc=='\t') ++filter->pc;
+  if (*filter->pc=='#')
+    {
+    if (parse_hashcomment(filter)==-1) return -1;
+    }
+#ifdef RFC_EOL
+  else if (*filter->pc=='\r' && *(filter->pc+1)=='\n')
+#else
+  else if (*filter->pc=='\n')
+#endif
+    {
+#ifdef RFC_EOL
+    filter->pc+=2;
+#else
+    ++filter->pc;
+#endif
+    ++filter->line;
+    }
+  else
+    {
+    filter->errmsg=CUS "syntax error";
+    return -1;
+    }
+  while (*filter->pc)
+    {
+#ifdef RFC_EOL
+    if (*filter->pc=='\r' && *(filter->pc+1)=='\n') /* end of line */
+#else
+    if (*filter->pc=='\n') /* end of line */
+#endif
+      {
+      g = string_catn(g, CUS "\r\n", 2);
+#ifdef RFC_EOL
+      filter->pc+=2;
+#else
+      ++filter->pc;
+#endif
+      ++filter->line;
+#ifdef RFC_EOL
+      if (*filter->pc=='.' && *(filter->pc+1)=='\r' && *(filter->pc+2)=='\n') /* end of string */
+#else
+      if (*filter->pc=='.' && *(filter->pc+1)=='\n') /* end of string */
+#endif
+        {
+	if (g)
+	  {
+	  data->character = string_from_gstring(g);
+	  data->length = g->ptr;
+	  }
+	else
+	  data->character = US"\0";
+	/* that way, there will be at least one character allocated */
+
+#ifdef RFC_EOL
+        filter->pc+=3;
+#else
+        filter->pc+=2;
+#endif
+        ++filter->line;
+#ifdef ENCODED_CHARACTER
+        if (filter->require_encoded_character
+            && string_decode(filter,data)==-1)
+          return -1;
+#endif
+        return 1;
+        }
+      else if (*filter->pc=='.' && *(filter->pc+1)=='.') /* remove dot stuffing */
+        {
+        g = string_catn(g, CUS ".", 1);
+        filter->pc+=2;
+        }
+      }
+    else /* regular character */
+      {
+      g = string_catn(g, filter->pc, 1);
+      filter->pc++;
+      }
+    }
+  filter->errmsg=CUS "missing end of multi line string";
+  return -1;
+  }
+else return 0;
+}
+
+
+/*************************************************
+*          Parse a specific identifier           *
+*************************************************/
+
+/*
+Token definition:
+  identifier       = (ALPHA / "_") *(ALPHA DIGIT "_")
+
+Arguments:
+  filter      points to the Sieve filter including its state
+  id          specifies identifier to match
+
+Returns:      1                success
+              0                identifier not matched
+*/
+
+static int parse_identifier(struct Sieve *filter, const uschar *id)
+{
+  size_t idlen=Ustrlen(id);
+
+  if (strncmpic(US filter->pc,US id,idlen)==0)
+  {
+    uschar next=filter->pc[idlen];
+
+    if ((next>='A' && next<='Z') || (next>='a' && next<='z') || next=='_' || (next>='0' && next<='9')) return 0;
+    filter->pc+=idlen;
+    return 1;
+  }
+  else return 0;
+}
+
+
+/*************************************************
+*                 Parse a number                 *
+*************************************************/
+
+/*
+Token definition:
+  number           = 1*DIGIT [QUANTIFIER]
+  QUANTIFIER       = "K" / "M" / "G"
+
+Arguments:
+  filter      points to the Sieve filter including its state
+  data        returns value
+
+Returns:      1                success
+              -1               no string list found
+*/
+
+static int parse_number(struct Sieve *filter, unsigned long *data)
+{
+unsigned long d,u;
+
+if (*filter->pc>='0' && *filter->pc<='9')
+  {
+  uschar *e;
+
+  errno=0;
+  d=Ustrtoul(filter->pc,&e,10);
+  if (errno==ERANGE)
+    {
+    filter->errmsg=CUstrerror(ERANGE);
+    return -1;
+    }
+  filter->pc=e;
+  u=1;
+  if (*filter->pc=='K') { u=1024; ++filter->pc; }
+  else if (*filter->pc=='M') { u=1024*1024; ++filter->pc; }
+  else if (*filter->pc=='G') { u=1024*1024*1024; ++filter->pc; }
+  if (d>(ULONG_MAX/u))
+    {
+    filter->errmsg=CUstrerror(ERANGE);
+    return -1;
+    }
+  d*=u;
+  *data=d;
+  return 1;
+  }
+else
+  {
+  filter->errmsg=CUS "missing number";
+  return -1;
+  }
+}
+
+
+/*************************************************
+*              Parse a string list               *
+*************************************************/
+
+/*
+Grammar:
+  string-list      = "[" string *("," string) "]" / string
+
+Arguments:
+  filter      points to the Sieve filter including its state
+  data        returns string list
+
+Returns:      1                success
+              -1               no string list found
+*/
+
+static int
+parse_stringlist(struct Sieve *filter, struct String **data)
+{
+const uschar *orig=filter->pc;
+int dataCapacity = 0;
+int dataLength = 0;
+struct String *d = NULL;
+int m;
+
+if (*filter->pc=='[') /* string list */
+  {
+  ++filter->pc;
+  for (;;)
+    {
+    if (parse_white(filter)==-1) goto error;
+    if (dataLength+1 >= dataCapacity) /* increase buffer */
+      {
+      struct String *new;
+
+      dataCapacity = dataCapacity ? dataCapacity * 2 : 4;
+      new = store_get(sizeof(struct String) * dataCapacity, GET_UNTAINTED);
+
+      if (d) memcpy(new,d,sizeof(struct String)*dataLength);
+      d = new;
+      }
+
+    m=parse_string(filter,&d[dataLength]);
+    if (m==0)
+      {
+      if (dataLength==0) break;
+      else
+        {
+        filter->errmsg=CUS "missing string";
+        goto error;
+        }
+      }
+    else if (m==-1) goto error;
+    else ++dataLength;
+    if (parse_white(filter)==-1) goto error;
+    if (*filter->pc==',') ++filter->pc;
+    else break;
+    }
+  if (*filter->pc==']')
+    {
+    d[dataLength].character=(uschar*)0;
+    d[dataLength].length=-1;
+    ++filter->pc;
+    *data=d;
+    return 1;
+    }
+  else
+    {
+    filter->errmsg=CUS "missing closing bracket";
+    goto error;
+    }
+  }
+else /* single string */
+  {
+  if (!(d=store_get(sizeof(struct String)*2, GET_UNTAINTED)))
+    return -1;
+
+  m=parse_string(filter,&d[0]);
+  if (m==-1)
+    return -1;
+
+  else if (m==0)
+    {
+    filter->pc=orig;
+    return 0;
+    }
+  else
+    {
+    d[1].character=(uschar*)0;
+    d[1].length=-1;
+    *data=d;
+    return 1;
+    }
+  }
+error:
+filter->errmsg=CUS "missing string list";
+return -1;
+}
+
+
+/*************************************************
+*    Parse an optional address part specifier    *
+*************************************************/
+
+/*
+Grammar:
+  address-part     =  ":localpart" / ":domain" / ":all"
+  address-part     =/ ":user" / ":detail"
+
+Arguments:
+  filter      points to the Sieve filter including its state
+  a           returns address part specified
+
+Returns:      1                success
+              0                no comparator found
+              -1               syntax error
+*/
+
+static int parse_addresspart(struct Sieve *filter, enum AddressPart *a)
+{
+#ifdef SUBADDRESS
+if (parse_identifier(filter,CUS ":user")==1)
+  {
+  if (!filter->require_subaddress)
+    {
+    filter->errmsg=CUS "missing previous require \"subaddress\";";
+    return -1;
+    }
+  *a=ADDRPART_USER;
+  return 1;
+  }
+else if (parse_identifier(filter,CUS ":detail")==1)
+  {
+  if (!filter->require_subaddress)
+    {
+    filter->errmsg=CUS "missing previous require \"subaddress\";";
+    return -1;
+    }
+  *a=ADDRPART_DETAIL;
+  return 1;
+  }
+else
+#endif
+if (parse_identifier(filter,CUS ":localpart")==1)
+  {
+  *a=ADDRPART_LOCALPART;
+  return 1;
+  }
+else if (parse_identifier(filter,CUS ":domain")==1)
+  {
+  *a=ADDRPART_DOMAIN;
+  return 1;
+  }
+else if (parse_identifier(filter,CUS ":all")==1)
+  {
+  *a=ADDRPART_ALL;
+  return 1;
+  }
+else return 0;
+}
+
+
+/*************************************************
+*         Parse an optional comparator           *
+*************************************************/
+
+/*
+Grammar:
+  comparator = ":comparator" <comparator-name: string>
+
+Arguments:
+  filter      points to the Sieve filter including its state
+  c           returns comparator
+
+Returns:      1                success
+              0                no comparator found
+              -1               incomplete comparator found
+*/
+
+static int parse_comparator(struct Sieve *filter, enum Comparator *c)
+{
+struct String comparator_name;
+
+if (parse_identifier(filter,CUS ":comparator")==0) return 0;
+if (parse_white(filter)==-1) return -1;
+switch (parse_string(filter,&comparator_name))
+  {
+  case -1: return -1;
+  case 0:
+    {
+    filter->errmsg=CUS "missing comparator";
+    return -1;
+    }
+  default:
+    {
+    int match;
+
+    if (eq_asciicase(&comparator_name,&str_ioctet,0))
+      {
+      *c=COMP_OCTET;
+      match=1;
+      }
+    else if (eq_asciicase(&comparator_name,&str_iascii_casemap,0))
+      {
+      *c=COMP_EN_ASCII_CASEMAP;
+      match=1;
+      }
+    else if (eq_asciicase(&comparator_name,&str_enascii_casemap,0))
+      {
+      *c=COMP_EN_ASCII_CASEMAP;
+      match=1;
+      }
+    else if (eq_asciicase(&comparator_name,&str_iascii_numeric,0))
+      {
+      *c=COMP_ASCII_NUMERIC;
+      match=1;
+      }
+    else
+      {
+      filter->errmsg=CUS "invalid comparator";
+      match=-1;
+      }
+    return match;
+    }
+  }
+}
+
+
+/*************************************************
+*          Parse an optional match type          *
+*************************************************/
+
+/*
+Grammar:
+  match-type = ":is" / ":contains" / ":matches"
+
+Arguments:
+  filter      points to the Sieve filter including its state
+  m           returns match type
+
+Returns:      1                success
+              0                no match type found
+*/
+
+static int parse_matchtype(struct Sieve *filter, enum MatchType *m)
+{
+  if (parse_identifier(filter,CUS ":is")==1)
+  {
+    *m=MATCH_IS;
+    return 1;
+  }
+  else if (parse_identifier(filter,CUS ":contains")==1)
+  {
+    *m=MATCH_CONTAINS;
+    return 1;
+  }
+  else if (parse_identifier(filter,CUS ":matches")==1)
+  {
+    *m=MATCH_MATCHES;
+    return 1;
+  }
+  else return 0;
+}
+
+
+/*************************************************
+*   Parse and interpret an optional test list    *
+*************************************************/
+
+/*
+Grammar:
+  test-list = "(" test *("," test) ")"
+
+Arguments:
+  filter      points to the Sieve filter including its state
+  n           total number of tests
+  num_true    number of passed tests
+  exec        Execute parsed statements
+
+Returns:      1                success
+              0                no test list found
+              -1               syntax or execution error
+*/
+
+static int parse_testlist(struct Sieve *filter, int *n, int *num_true, int exec)
+{
+if (parse_white(filter)==-1) return -1;
+if (*filter->pc=='(')
+  {
+  ++filter->pc;
+  *n=0;
+   *num_true=0;
+  for (;;)
+    {
+    int cond;
+
+    switch (parse_test(filter,&cond,exec))
+      {
+      case -1: return -1;
+      case 0: filter->errmsg=CUS "missing test"; return -1;
+      default: ++*n; if (cond) ++*num_true; break;
+      }
+    if (parse_white(filter)==-1) return -1;
+    if (*filter->pc==',') ++filter->pc;
+    else break;
+    }
+  if (*filter->pc==')')
+    {
+    ++filter->pc;
+    return 1;
+    }
+  else
+    {
+    filter->errmsg=CUS "missing closing paren";
+    return -1;
+    }
+  }
+else return 0;
+}
+
+
+/*************************************************
+*     Parse and interpret an optional test       *
+*************************************************/
+
+/*
+Arguments:
+  filter      points to the Sieve filter including its state
+  cond        returned condition status
+  exec        Execute parsed statements
+
+Returns:      1                success
+              0                no test found
+              -1               syntax or execution error
+*/
+
+static int
+parse_test(struct Sieve *filter, int *cond, int exec)
+{
+if (parse_white(filter)==-1) return -1;
+if (parse_identifier(filter,CUS "address"))
+  {
+  /*
+  address-test = "address" { [address-part] [comparator] [match-type] }
+                 <header-list: string-list> <key-list: string-list>
+
+  header-list From, To, Cc, Bcc, Sender, Resent-From, Resent-To
+  */
+
+  enum AddressPart addressPart=ADDRPART_ALL;
+  enum Comparator comparator=COMP_EN_ASCII_CASEMAP;
+  enum MatchType matchType=MATCH_IS;
+  struct String *hdr,*key;
+  int m;
+  int ap=0,co=0,mt=0;
+
+  for (;;)
+    {
+    if (parse_white(filter)==-1) return -1;
+    if ((m=parse_addresspart(filter,&addressPart))!=0)
+      {
+      if (m==-1) return -1;
+      if (ap)
+        {
+        filter->errmsg=CUS "address part already specified";
+        return -1;
+        }
+      else ap=1;
+      }
+    else if ((m=parse_comparator(filter,&comparator))!=0)
+      {
+      if (m==-1) return -1;
+      if (co)
+        {
+        filter->errmsg=CUS "comparator already specified";
+        return -1;
+        }
+      else co=1;
+      }
+    else if ((m=parse_matchtype(filter,&matchType))!=0)
+      {
+      if (m==-1) return -1;
+      if (mt)
+        {
+        filter->errmsg=CUS "match type already specified";
+        return -1;
+        }
+      else mt=1;
+      }
+    else break;
+    }
+  if (parse_white(filter)==-1) return -1;
+  if ((m=parse_stringlist(filter,&hdr))!=1)
+    {
+    if (m==0) filter->errmsg=CUS "header string list expected";
+    return -1;
+    }
+  if (parse_white(filter)==-1) return -1;
+  if ((m=parse_stringlist(filter,&key))!=1)
+    {
+    if (m==0) filter->errmsg=CUS "key string list expected";
+    return -1;
+    }
+  *cond=0;
+  for (struct String * h = hdr; h->length!=-1 && !*cond; ++h)
+    {
+    uschar *header_value=(uschar*)0,*extracted_addr,*end_addr;
+
+    if
+      (
+      !eq_asciicase(h,&str_from,0)
+      && !eq_asciicase(h,&str_to,0)
+      && !eq_asciicase(h,&str_cc,0)
+      && !eq_asciicase(h,&str_bcc,0)
+      && !eq_asciicase(h,&str_sender,0)
+      && !eq_asciicase(h,&str_resent_from,0)
+      && !eq_asciicase(h,&str_resent_to,0)
+      )
+      {
+      filter->errmsg=CUS "invalid header field";
+      return -1;
+      }
+    if (exec)
+      {
+      /* We are only interested in addresses below, so no MIME decoding */
+      if (!(header_value = expand_string(string_sprintf("$rheader_%s",quote(h)))))
+        {
+        filter->errmsg=CUS "header string expansion failed";
+        return -1;
+        }
+      f.parse_allow_group = TRUE;
+      while (*header_value && !*cond)
+        {
+        uschar *error;
+        int start, end, domain;
+        int saveend;
+        uschar *part=NULL;
+
+        end_addr = parse_find_address_end(header_value, FALSE);
+        saveend = *end_addr;
+        *end_addr = 0;
+        extracted_addr = parse_extract_address(header_value, &error, &start, &end, &domain, FALSE);
+
+        if (extracted_addr) switch (addressPart)
+          {
+          case ADDRPART_ALL: part=extracted_addr; break;
+#ifdef SUBADDRESS
+          case ADDRPART_USER:
+#endif
+          case ADDRPART_LOCALPART: part=extracted_addr; part[domain-1]='\0'; break;
+          case ADDRPART_DOMAIN: part=extracted_addr+domain; break;
+#ifdef SUBADDRESS
+          case ADDRPART_DETAIL: part=NULL; break;
+#endif
+          }
+
+        *end_addr = saveend;
+        if (part)
+          {
+          for (struct String * k = key; k->length !=- 1; ++k)
+            {
+            struct String partStr = {.character = part, .length = Ustrlen(part)};
+
+            if (extracted_addr)
+              {
+              *cond=compare(filter,k,&partStr,comparator,matchType);
+              if (*cond==-1) return -1;
+              if (*cond) break;
+              }
+            }
+          }
+        if (saveend == 0) break;
+        header_value = end_addr + 1;
+        }
+      f.parse_allow_group = FALSE;
+      f.parse_found_group = FALSE;
+      }
+    }
+  return 1;
+  }
+else if (parse_identifier(filter,CUS "allof"))
+  {
+  /*
+  allof-test   = "allof" <tests: test-list>
+  */
+
+  int n,num_true;
+
+  switch (parse_testlist(filter,&n,&num_true,exec))
+    {
+    case -1: return -1;
+    case 0: filter->errmsg=CUS "missing test list"; return -1;
+    default: *cond=(n==num_true); return 1;
+    }
+  }
+else if (parse_identifier(filter,CUS "anyof"))
+  {
+  /*
+  anyof-test   = "anyof" <tests: test-list>
+  */
+
+  int n,num_true;
+
+  switch (parse_testlist(filter,&n,&num_true,exec))
+    {
+    case -1: return -1;
+    case 0: filter->errmsg=CUS "missing test list"; return -1;
+    default: *cond=(num_true>0); return 1;
+    }
+  }
+else if (parse_identifier(filter,CUS "exists"))
+  {
+  /*
+  exists-test = "exists" <header-names: string-list>
+  */
+
+  struct String *hdr;
+  int m;
+
+  if (parse_white(filter)==-1) return -1;
+  if ((m=parse_stringlist(filter,&hdr))!=1)
+    {
+    if (m==0) filter->errmsg=CUS "header string list expected";
+    return -1;
+    }
+  if (exec)
+    {
+    *cond=1;
+    for (struct String * h = hdr; h->length != -1 && *cond; ++h)
+      {
+      uschar *header_def;
+
+      header_def = expand_string(string_sprintf("${if def:header_%s {true}{false}}",quote(h)));
+      if (!header_def)
+        {
+        filter->errmsg=CUS "header string expansion failed";
+        return -1;
+        }
+      if (Ustrcmp(header_def,"false")==0) *cond=0;
+      }
+    }
+  return 1;
+  }
+else if (parse_identifier(filter,CUS "false"))
+  {
+  /*
+  false-test = "false"
+  */
+
+  *cond=0;
+  return 1;
+  }
+else if (parse_identifier(filter,CUS "header"))
+  {
+  /*
+  header-test = "header" { [comparator] [match-type] }
+                <header-names: string-list> <key-list: string-list>
+  */
+
+  enum Comparator comparator=COMP_EN_ASCII_CASEMAP;
+  enum MatchType matchType=MATCH_IS;
+  struct String *hdr,*key;
+  int m;
+  int co=0,mt=0;
+
+  for (;;)
+    {
+    if (parse_white(filter)==-1) return -1;
+    if ((m=parse_comparator(filter,&comparator))!=0)
+      {
+      if (m==-1) return -1;
+      if (co)
+        {
+        filter->errmsg=CUS "comparator already specified";
+        return -1;
+        }
+      else co=1;
+      }
+    else if ((m=parse_matchtype(filter,&matchType))!=0)
+      {
+      if (m==-1) return -1;
+      if (mt)
+        {
+        filter->errmsg=CUS "match type already specified";
+        return -1;
+        }
+      else mt=1;
+      }
+    else break;
+    }
+  if (parse_white(filter)==-1) return -1;
+  if ((m=parse_stringlist(filter,&hdr))!=1)
+    {
+    if (m==0) filter->errmsg=CUS "header string list expected";
+    return -1;
+    }
+  if (parse_white(filter)==-1) return -1;
+  if ((m=parse_stringlist(filter,&key))!=1)
+    {
+    if (m==0) filter->errmsg=CUS "key string list expected";
+    return -1;
+    }
+  *cond=0;
+  for (struct String * h = hdr; h->length != -1 && !*cond; ++h)
+    {
+    if (!is_header(h))
+      {
+      filter->errmsg=CUS "invalid header field";
+      return -1;
+      }
+    if (exec)
+      {
+      struct String header_value;
+      uschar *header_def;
+
+      expand_header(&header_value,h);
+      header_def = expand_string(string_sprintf("${if def:header_%s {true}{false}}",quote(h)));
+      if (!header_value.character || !header_def)
+        {
+        filter->errmsg=CUS "header string expansion failed";
+        return -1;
+        }
+      for (struct String * k = key; k->length != -1; ++k)
+        if (Ustrcmp(header_def,"true")==0)
+          {
+          *cond=compare(filter,k,&header_value,comparator,matchType);
+          if (*cond==-1) return -1;
+          if (*cond) break;
+          }
+      }
+    }
+  return 1;
+  }
+else if (parse_identifier(filter,CUS "not"))
+  {
+  if (parse_white(filter)==-1) return -1;
+  switch (parse_test(filter,cond,exec))
+    {
+    case -1: return -1;
+    case 0: filter->errmsg=CUS "missing test"; return -1;
+    default: *cond=!*cond; return 1;
+    }
+  }
+else if (parse_identifier(filter,CUS "size"))
+  {
+  /*
+  relop = ":over" / ":under"
+  size-test = "size" relop <limit: number>
+  */
+
+  unsigned long limit;
+  int overNotUnder;
+
+  if (parse_white(filter)==-1) return -1;
+  if (parse_identifier(filter,CUS ":over")) overNotUnder=1;
+  else if (parse_identifier(filter,CUS ":under")) overNotUnder=0;
+  else
+    {
+    filter->errmsg=CUS "missing :over or :under";
+    return -1;
+    }
+  if (parse_white(filter)==-1) return -1;
+  if (parse_number(filter,&limit)==-1) return -1;
+  *cond=(overNotUnder ? (message_size>limit) : (message_size<limit));
+  return 1;
+  }
+else if (parse_identifier(filter,CUS "true"))
+  {
+  *cond=1;
+  return 1;
+  }
+else if (parse_identifier(filter,CUS "envelope"))
+  {
+  /*
+  envelope-test = "envelope" { [comparator] [address-part] [match-type] }
+                  <envelope-part: string-list> <key-list: string-list>
+
+  envelope-part is case insensitive "from" or "to"
+#ifdef ENVELOPE_AUTH
+  envelope-part =/ "auth"
+#endif
+  */
+
+  enum Comparator comparator=COMP_EN_ASCII_CASEMAP;
+  enum AddressPart addressPart=ADDRPART_ALL;
+  enum MatchType matchType=MATCH_IS;
+  struct String *env,*key;
+  int m;
+  int co=0,ap=0,mt=0;
+
+  if (!filter->require_envelope)
+    {
+    filter->errmsg=CUS "missing previous require \"envelope\";";
+    return -1;
+    }
+  for (;;)
+    {
+    if (parse_white(filter)==-1) return -1;
+    if ((m=parse_comparator(filter,&comparator))!=0)
+      {
+      if (m==-1) return -1;
+      if (co)
+        {
+        filter->errmsg=CUS "comparator already specified";
+        return -1;
+        }
+      else co=1;
+      }
+    else if ((m=parse_addresspart(filter,&addressPart))!=0)
+      {
+      if (m==-1) return -1;
+      if (ap)
+        {
+        filter->errmsg=CUS "address part already specified";
+        return -1;
+        }
+      else ap=1;
+      }
+    else if ((m=parse_matchtype(filter,&matchType))!=0)
+      {
+      if (m==-1) return -1;
+      if (mt)
+        {
+        filter->errmsg=CUS "match type already specified";
+        return -1;
+        }
+      else mt=1;
+      }
+    else break;
+    }
+  if (parse_white(filter)==-1) return -1;
+  if ((m=parse_stringlist(filter,&env))!=1)
+    {
+    if (m==0) filter->errmsg=CUS "envelope string list expected";
+    return -1;
+    }
+  if (parse_white(filter)==-1) return -1;
+  if ((m=parse_stringlist(filter,&key))!=1)
+    {
+    if (m==0) filter->errmsg=CUS "key string list expected";
+    return -1;
+    }
+  *cond=0;
+  for (struct String * e = env; e->length != -1 && !*cond; ++e)
+    {
+    const uschar *envelopeExpr=CUS 0;
+    uschar *envelope=US 0;
+
+    if (eq_asciicase(e,&str_from,0))
+      {
+      switch (addressPart)
+        {
+        case ADDRPART_ALL: envelopeExpr=CUS "$sender_address"; break;
+#ifdef SUBADDRESS
+        case ADDRPART_USER:
+#endif
+        case ADDRPART_LOCALPART: envelopeExpr=CUS "${local_part:$sender_address}"; break;
+        case ADDRPART_DOMAIN: envelopeExpr=CUS "${domain:$sender_address}"; break;
+#ifdef SUBADDRESS
+        case ADDRPART_DETAIL: envelopeExpr=CUS 0; break;
+#endif
+        }
+      }
+    else if (eq_asciicase(e,&str_to,0))
+      {
+      switch (addressPart)
+        {
+        case ADDRPART_ALL: envelopeExpr=CUS "$local_part_prefix$local_part$local_part_suffix@$domain"; break;
+#ifdef SUBADDRESS
+        case ADDRPART_USER: envelopeExpr=filter->useraddress; break;
+        case ADDRPART_DETAIL: envelopeExpr=filter->subaddress; break;
+#endif
+        case ADDRPART_LOCALPART: envelopeExpr=CUS "$local_part_prefix$local_part$local_part_suffix"; break;
+        case ADDRPART_DOMAIN: envelopeExpr=CUS "$domain"; break;
+        }
+      }
+#ifdef ENVELOPE_AUTH
+    else if (eq_asciicase(e,&str_auth,0))
+      {
+      switch (addressPart)
+        {
+        case ADDRPART_ALL: envelopeExpr=CUS "$authenticated_sender"; break;
+#ifdef SUBADDRESS
+        case ADDRPART_USER:
+#endif
+        case ADDRPART_LOCALPART: envelopeExpr=CUS "${local_part:$authenticated_sender}"; break;
+        case ADDRPART_DOMAIN: envelopeExpr=CUS "${domain:$authenticated_sender}"; break;
+#ifdef SUBADDRESS
+        case ADDRPART_DETAIL: envelopeExpr=CUS 0; break;
+#endif
+        }
+      }
+#endif
+    else
+      {
+      filter->errmsg=CUS "invalid envelope string";
+      return -1;
+      }
+    if (exec && envelopeExpr)
+      {
+      if (!(envelope=expand_string(US envelopeExpr)))
+        {
+        filter->errmsg=CUS "header string expansion failed";
+        return -1;
+        }
+      for (struct String * k = key; k->length != -1; ++k)
+        {
+        struct String envelopeStr = {.character = envelope, .length = Ustrlen(envelope)};
+
+        *cond=compare(filter,k,&envelopeStr,comparator,matchType);
+        if (*cond==-1) return -1;
+        if (*cond) break;
+        }
+      }
+    }
+  return 1;
+  }
+#ifdef ENOTIFY
+else if (parse_identifier(filter,CUS "valid_notify_method"))
+  {
+  /*
+  valid_notify_method = "valid_notify_method"
+                        <notification-uris: string-list>
+  */
+
+  struct String *uris;
+  int m;
+
+  if (!filter->require_enotify)
+    {
+    filter->errmsg=CUS "missing previous require \"enotify\";";
+    return -1;
+    }
+  if (parse_white(filter)==-1) return -1;
+  if ((m=parse_stringlist(filter,&uris))!=1)
+    {
+    if (m==0) filter->errmsg=CUS "URI string list expected";
+    return -1;
+    }
+  if (exec)
+    {
+    *cond=1;
+    for (struct String * u = uris; u->length != -1 && *cond; ++u)
+      {
+        string_item *recipient;
+        struct String header,subject,body;
+
+        recipient=NULL;
+        header.length=-1;
+        header.character=(uschar*)0;
+        subject.length=-1;
+        subject.character=(uschar*)0;
+        body.length=-1;
+        body.character=(uschar*)0;
+        if (parse_mailto_uri(filter,u->character,&recipient,&header,&subject,&body)!=1)
+          *cond=0;
+      }
+    }
+  return 1;
+  }
+else if (parse_identifier(filter,CUS "notify_method_capability"))
+  {
+  /*
+  notify_method_capability = "notify_method_capability" [COMPARATOR] [MATCH-TYPE]
+                             <notification-uri: string>
+                             <notification-capability: string>
+                             <key-list: string-list>
+  */
+
+  int m;
+  int co=0,mt=0;
+
+  enum Comparator comparator=COMP_EN_ASCII_CASEMAP;
+  enum MatchType matchType=MATCH_IS;
+  struct String uri,capa,*keys;
+
+  if (!filter->require_enotify)
+    {
+    filter->errmsg=CUS "missing previous require \"enotify\";";
+    return -1;
+    }
+  for (;;)
+    {
+    if (parse_white(filter)==-1) return -1;
+    if ((m=parse_comparator(filter,&comparator))!=0)
+      {
+      if (m==-1) return -1;
+      if (co)
+        {
+        filter->errmsg=CUS "comparator already specified";
+        return -1;
+        }
+      else co=1;
+      }
+    else if ((m=parse_matchtype(filter,&matchType))!=0)
+      {
+      if (m==-1) return -1;
+      if (mt)
+        {
+        filter->errmsg=CUS "match type already specified";
+        return -1;
+        }
+      else mt=1;
+      }
+    else break;
+    }
+    if ((m=parse_string(filter,&uri))!=1)
+      {
+      if (m==0) filter->errmsg=CUS "missing notification URI string";
+      return -1;
+      }
+    if (parse_white(filter)==-1) return -1;
+    if ((m=parse_string(filter,&capa))!=1)
+      {
+      if (m==0) filter->errmsg=CUS "missing notification capability string";
+      return -1;
+      }
+    if (parse_white(filter)==-1) return -1;
+    if ((m=parse_stringlist(filter,&keys))!=1)
+      {
+      if (m==0) filter->errmsg=CUS "missing key string list";
+      return -1;
+      }
+    if (exec)
+      {
+      string_item *recipient;
+      struct String header,subject,body;
+
+      *cond=0;
+      recipient=NULL;
+      header.length=-1;
+      header.character=(uschar*)0;
+      subject.length=-1;
+      subject.character=(uschar*)0;
+      body.length=-1;
+      body.character=(uschar*)0;
+      if (parse_mailto_uri(filter,uri.character,&recipient,&header,&subject,&body)==1)
+        if (eq_asciicase(&capa,&str_online,0)==1)
+          for (struct String * k = keys; k->length != -1; ++k)
+            {
+            *cond=compare(filter,k,&str_maybe,comparator,matchType);
+            if (*cond==-1) return -1;
+            if (*cond) break;
+            }
+      }
+    return 1;
+  }
+#endif
+else return 0;
+}
+
+
+/*************************************************
+*     Parse and interpret an optional block      *
+*************************************************/
+
+/*
+Arguments:
+  filter      points to the Sieve filter including its state
+  exec        Execute parsed statements
+  generated   where to hang newly-generated addresses
+
+Returns:      2                success by stop
+              1                other success
+              0                no block command found
+              -1               syntax or execution error
+*/
+
+static int parse_block(struct Sieve *filter, int exec,
+  address_item **generated)
+{
+int r;
+
+if (parse_white(filter)==-1) return -1;
+if (*filter->pc=='{')
+  {
+  ++filter->pc;
+  if ((r=parse_commands(filter,exec,generated))==-1 || r==2) return r;
+  if (*filter->pc=='}')
+    {
+    ++filter->pc;
+    return 1;
+    }
+  else
+    {
+    filter->errmsg=CUS "expecting command or closing brace";
+    return -1;
+    }
+  }
+else return 0;
+}
+
+
+/*************************************************
+*           Match a semicolon                    *
+*************************************************/
+
+/*
+Arguments:
+  filter      points to the Sieve filter including its state
+
+Returns:      1                success
+              -1               syntax error
+*/
+
+static int parse_semicolon(struct Sieve *filter)
+{
+  if (parse_white(filter)==-1) return -1;
+  if (*filter->pc==';')
+  {
+    ++filter->pc;
+    return 1;
+  }
+  else
+  {
+    filter->errmsg=CUS "missing semicolon";
+    return -1;
+  }
+}
+
+
+/*************************************************
+*     Parse and interpret a Sieve command        *
+*************************************************/
+
+/*
+Arguments:
+  filter      points to the Sieve filter including its state
+  exec        Execute parsed statements
+  generated   where to hang newly-generated addresses
+
+Returns:      2                success by stop
+              1                other success
+              -1               syntax or execution error
+*/
+static int
+parse_commands(struct Sieve *filter, int exec, address_item **generated)
+{
+while (*filter->pc)
+  {
+  if (parse_white(filter)==-1) return -1;
+  if (parse_identifier(filter,CUS "if"))
+    {
+    /*
+    if-command = "if" test block *( "elsif" test block ) [ else block ]
+    */
+
+    int cond,m,unsuccessful;
+
+    /* test block */
+    if (parse_white(filter)==-1) return -1;
+    if ((m=parse_test(filter,&cond,exec))==-1) return -1;
+    if (m==0)
+      {
+      filter->errmsg=CUS "missing test";
+      return -1;
+      }
+    if ((filter_test != FTEST_NONE && debug_selector != 0) ||
+        (debug_selector & D_filter) != 0)
+      {
+      if (exec) debug_printf("if %s\n",cond?"true":"false");
+      }
+    m=parse_block(filter,exec ? cond : 0, generated);
+    if (m==-1 || m==2) return m;
+    if (m==0)
+      {
+      filter->errmsg=CUS "missing block";
+      return -1;
+      }
+    unsuccessful = !cond;
+    for (;;) /* elsif test block */
+      {
+      if (parse_white(filter)==-1) return -1;
+      if (parse_identifier(filter,CUS "elsif"))
+        {
+        if (parse_white(filter)==-1) return -1;
+        m=parse_test(filter,&cond,exec && unsuccessful);
+        if (m==-1 || m==2) return m;
+        if (m==0)
+          {
+          filter->errmsg=CUS "missing test";
+          return -1;
+          }
+        if ((filter_test != FTEST_NONE && debug_selector != 0) ||
+            (debug_selector & D_filter) != 0)
+          {
+          if (exec) debug_printf("elsif %s\n",cond?"true":"false");
+          }
+        m=parse_block(filter,exec && unsuccessful ? cond : 0, generated);
+        if (m==-1 || m==2) return m;
+        if (m==0)
+          {
+          filter->errmsg=CUS "missing block";
+          return -1;
+          }
+        if (exec && unsuccessful && cond) unsuccessful = 0;
+        }
+      else break;
+      }
+    /* else block */
+    if (parse_white(filter)==-1) return -1;
+    if (parse_identifier(filter,CUS "else"))
+      {
+      m=parse_block(filter,exec && unsuccessful, generated);
+      if (m==-1 || m==2) return m;
+      if (m==0)
+        {
+        filter->errmsg=CUS "missing block";
+        return -1;
+        }
+      }
+    }
+  else if (parse_identifier(filter,CUS "stop"))
+    {
+    /*
+    stop-command     =  "stop" { stop-options } ";"
+    stop-options     =
+    */
+
+    if (parse_semicolon(filter)==-1) return -1;
+    if (exec)
+      {
+      filter->pc+=Ustrlen(filter->pc);
+      return 2;
+      }
+    }
+  else if (parse_identifier(filter,CUS "keep"))
+    {
+    /*
+    keep-command     =  "keep" { keep-options } ";"
+    keep-options     =
+    */
+
+    if (parse_semicolon(filter)==-1) return -1;
+    if (exec)
+      {
+      add_addr(generated,US"inbox",1,0,0,0);
+      filter->keep = 0;
+      }
+    }
+  else if (parse_identifier(filter,CUS "discard"))
+    {
+    /*
+    discard-command  =  "discard" { discard-options } ";"
+    discard-options  =
+    */
+
+    if (parse_semicolon(filter)==-1) return -1;
+    if (exec) filter->keep=0;
+    }
+  else if (parse_identifier(filter,CUS "redirect"))
+    {
+    /*
+    redirect-command =  "redirect" redirect-options "string" ";"
+    redirect-options =
+    redirect-options =) ":copy"
+    */
+
+    struct String recipient;
+    int m;
+    int copy=0;
+
+    for (;;)
+      {
+      if (parse_white(filter)==-1) return -1;
+      if (parse_identifier(filter,CUS ":copy")==1)
+        {
+        if (!filter->require_copy)
+          {
+          filter->errmsg=CUS "missing previous require \"copy\";";
+          return -1;
+          }
+          copy=1;
+        }
+      else break;
+      }
+    if (parse_white(filter)==-1) return -1;
+    if ((m=parse_string(filter,&recipient))!=1)
+      {
+      if (m==0) filter->errmsg=CUS "missing redirect recipient string";
+      return -1;
+      }
+    if (strchr(CCS recipient.character,'@')==(char*)0)
+      {
+      filter->errmsg=CUS "unqualified recipient address";
+      return -1;
+      }
+    if (exec)
+      {
+      add_addr(generated,recipient.character,0,0,0,0);
+      if (!copy) filter->keep = 0;
+      }
+    if (parse_semicolon(filter)==-1) return -1;
+    }
+  else if (parse_identifier(filter,CUS "fileinto"))
+    {
+    /*
+    fileinto-command =  "fileinto" { fileinto-options } string ";"
+    fileinto-options =
+    fileinto-options =) [ ":copy" ]
+    */
+
+    struct String folder;
+    uschar *s;
+    int m;
+    unsigned long maxage, maxmessages, maxstorage;
+    int copy=0;
+
+    maxage = maxmessages = maxstorage = 0;
+    if (!filter->require_fileinto)
+      {
+      filter->errmsg=CUS "missing previous require \"fileinto\";";
+      return -1;
+      }
+    for (;;)
+      {
+      if (parse_white(filter)==-1) return -1;
+      if (parse_identifier(filter,CUS ":copy")==1)
+        {
+        if (!filter->require_copy)
+          {
+          filter->errmsg=CUS "missing previous require \"copy\";";
+          return -1;
+          }
+          copy=1;
+        }
+      else break;
+      }
+    if (parse_white(filter)==-1) return -1;
+    if ((m=parse_string(filter,&folder))!=1)
+      {
+      if (m==0) filter->errmsg=CUS "missing fileinto folder string";
+      return -1;
+      }
+    m=0; s=folder.character;
+    if (folder.length==0) m=1;
+    if (Ustrcmp(s,"..")==0 || Ustrncmp(s,"../",3)==0) m=1;
+    else while (*s)
+      {
+      if (Ustrcmp(s,"/..")==0 || Ustrncmp(s,"/../",4)==0) { m=1; break; }
+      ++s;
+      }
+    if (m)
+      {
+      filter->errmsg=CUS "invalid folder";
+      return -1;
+      }
+    if (exec)
+      {
+      add_addr(generated, folder.character, 1, maxage, maxmessages, maxstorage);
+      if (!copy) filter->keep = 0;
+      }
+    if (parse_semicolon(filter)==-1) return -1;
+    }
+#ifdef ENOTIFY
+  else if (parse_identifier(filter,CUS "notify"))
+    {
+    /*
+    notify-command =  "notify" { notify-options } <method: string> ";"
+    notify-options =  [":from" string]
+                      [":importance" <"1" / "2" / "3">]
+                      [":options" 1*(string-list / number)]
+                      [":message" string]
+    */
+
+    int m;
+    struct String from;
+    struct String importance;
+    struct String message;
+    struct String method;
+    struct Notification *already;
+    string_item *recipient;
+    struct String header;
+    struct String subject;
+    struct String body;
+    uschar *envelope_from;
+    struct String auto_submitted_value;
+    uschar *auto_submitted_def;
+
+    if (!filter->require_enotify)
+      {
+      filter->errmsg=CUS "missing previous require \"enotify\";";
+      return -1;
+      }
+    from.character=(uschar*)0;
+    from.length=-1;
+    importance.character=(uschar*)0;
+    importance.length=-1;
+    message.character=(uschar*)0;
+    message.length=-1;
+    recipient=NULL;
+    header.length=-1;
+    header.character=(uschar*)0;
+    subject.length=-1;
+    subject.character=(uschar*)0;
+    body.length=-1;
+    body.character=(uschar*)0;
+    envelope_from = sender_address && sender_address[0]
+     ? expand_string(US"$local_part_prefix$local_part$local_part_suffix@$domain") : US "";
+    if (!envelope_from)
+      {
+      filter->errmsg=CUS "expansion failure for envelope from";
+      return -1;
+      }
+    for (;;)
+      {
+      if (parse_white(filter)==-1) return -1;
+      if (parse_identifier(filter,CUS ":from")==1)
+        {
+        if (parse_white(filter)==-1) return -1;
+        if ((m=parse_string(filter,&from))!=1)
+          {
+          if (m==0) filter->errmsg=CUS "from string expected";
+          return -1;
+          }
+        }
+      else if (parse_identifier(filter,CUS ":importance")==1)
+        {
+        if (parse_white(filter)==-1) return -1;
+        if ((m=parse_string(filter,&importance))!=1)
+          {
+          if (m==0) filter->errmsg=CUS "importance string expected";
+          return -1;
+          }
+        if (importance.length!=1 || importance.character[0]<'1' || importance.character[0]>'3')
+          {
+          filter->errmsg=CUS "invalid importance";
+          return -1;
+          }
+        }
+      else if (parse_identifier(filter,CUS ":options")==1)
+        {
+        if (parse_white(filter)==-1) return -1;
+        }
+      else if (parse_identifier(filter,CUS ":message")==1)
+        {
+        if (parse_white(filter)==-1) return -1;
+        if ((m=parse_string(filter,&message))!=1)
+          {
+          if (m==0) filter->errmsg=CUS "message string expected";
+          return -1;
+          }
+        }
+      else break;
+      }
+    if (parse_white(filter)==-1) return -1;
+    if ((m=parse_string(filter,&method))!=1)
+      {
+      if (m==0) filter->errmsg=CUS "missing method string";
+      return -1;
+      }
+    if (parse_semicolon(filter)==-1) return -1;
+    if (parse_mailto_uri(filter,method.character,&recipient,&header,&subject,&body)!=1)
+      return -1;
+    if (exec)
+      {
+      if (message.length==-1) message=subject;
+      if (message.length==-1) expand_header(&message,&str_subject);
+      expand_header(&auto_submitted_value,&str_auto_submitted);
+      auto_submitted_def=expand_string(US"${if def:header_auto-submitted {true}{false}}");
+      if (!auto_submitted_value.character || !auto_submitted_def)
+        {
+        filter->errmsg=CUS "header string expansion failed";
+        return -1;
+        }
+        if (Ustrcmp(auto_submitted_def,"true")!=0 || Ustrcmp(auto_submitted_value.character,"no")==0)
+        {
+        for (already=filter->notified; already; already=already->next)
+          {
+          if (already->method.length==method.length
+              && (method.length==-1 || Ustrcmp(already->method.character,method.character)==0)
+              && already->importance.length==importance.length
+              && (importance.length==-1 || Ustrcmp(already->importance.character,importance.character)==0)
+              && already->message.length==message.length
+              && (message.length==-1 || Ustrcmp(already->message.character,message.character)==0))
+            break;
+          }
+        if (!already)
+          /* New notification, process it */
+          {
+          struct Notification * sent = store_get(sizeof(struct Notification), GET_UNTAINTED);
+          sent->method=method;
+          sent->importance=importance;
+          sent->message=message;
+          sent->next=filter->notified;
+          filter->notified=sent;
+  #ifndef COMPILE_SYNTAX_CHECKER
+          if (filter_test == FTEST_NONE)
+            {
+            int pid, fd;
+
+            if ((pid = child_open_exim2(&fd, envelope_from, envelope_from,
+			US"sieve-notify")) >= 1)
+              {
+              FILE * f = fdopen(fd, "wb");
+
+              fprintf(f,"From: %s\n", from.length == -1
+		? expand_string(US"$local_part_prefix$local_part$local_part_suffix@$domain")
+		: from.character);
+              for (string_item * p = recipient; p; p=p->next)
+	       	fprintf(f, "To: %s\n",p->text);
+              fprintf(f, "Auto-Submitted: auto-notified; %s\n", filter->enotify_mailto_owner);
+              if (header.length > 0) fprintf(f, "%s", header.character);
+              if (message.length==-1)
+                {
+                message.character=US"Notification";
+                message.length=Ustrlen(message.character);
+                }
+              if (message.length != -1)
+		fprintf(f, "Subject: %s\n", parse_quote_2047(message.character,
+		  message.length, US"utf-8", TRUE));
+              fprintf(f,"\n");
+              if (body.length > 0) fprintf(f, "%s\n", body.character);
+              fflush(f);
+              (void)fclose(f);
+              (void)child_close(pid, 0);
+              }
+            }
+          if ((filter_test != FTEST_NONE && debug_selector != 0) || debug_selector & D_filter)
+            debug_printf("Notification to `%s': '%s'.\n",method.character,message.length!=-1 ? message.character : CUS "");
+#endif
+          }
+        else
+          if ((filter_test != FTEST_NONE && debug_selector != 0) || debug_selector & D_filter)
+            debug_printf("Repeated notification to `%s' ignored.\n",method.character);
+        }
+      else
+        if ((filter_test != FTEST_NONE && debug_selector != 0) || debug_selector & D_filter)
+          debug_printf("Ignoring notification, triggering message contains Auto-submitted: field.\n");
+      }
+    }
+#endif
+#ifdef VACATION
+  else if (parse_identifier(filter,CUS "vacation"))
+    {
+    /*
+    vacation-command =  "vacation" { vacation-options } <reason: string> ";"
+    vacation-options =  [":days" number]
+                        [":subject" string]
+                        [":from" string]
+                        [":addresses" string-list]
+                        [":mime"]
+                        [":handle" string]
+    */
+
+    int m;
+    unsigned long days;
+    struct String subject;
+    struct String from;
+    struct String *addresses;
+    int reason_is_mime;
+    string_item *aliases;
+    struct String handle;
+    struct String reason;
+
+    if (!filter->require_vacation)
+      {
+      filter->errmsg=CUS "missing previous require \"vacation\";";
+      return -1;
+      }
+    if (exec)
+      {
+      if (filter->vacation_ran)
+        {
+        filter->errmsg=CUS "trying to execute vacation more than once";
+        return -1;
+        }
+      filter->vacation_ran=1;
+      }
+    days=VACATION_MIN_DAYS>7 ? VACATION_MIN_DAYS : 7;
+    subject.character=(uschar*)0;
+    subject.length=-1;
+    from.character=(uschar*)0;
+    from.length=-1;
+    addresses=(struct String*)0;
+    aliases=NULL;
+    reason_is_mime=0;
+    handle.character=(uschar*)0;
+    handle.length=-1;
+    for (;;)
+      {
+      if (parse_white(filter)==-1) return -1;
+      if (parse_identifier(filter,CUS ":days")==1)
+        {
+        if (parse_white(filter)==-1) return -1;
+        if (parse_number(filter,&days)==-1) return -1;
+        if (days<VACATION_MIN_DAYS) days=VACATION_MIN_DAYS;
+        else if (days>VACATION_MAX_DAYS) days=VACATION_MAX_DAYS;
+        }
+      else if (parse_identifier(filter,CUS ":subject")==1)
+        {
+        if (parse_white(filter)==-1) return -1;
+        if ((m=parse_string(filter,&subject))!=1)
+          {
+          if (m==0) filter->errmsg=CUS "subject string expected";
+          return -1;
+          }
+        }
+      else if (parse_identifier(filter,CUS ":from")==1)
+        {
+        if (parse_white(filter)==-1) return -1;
+        if ((m=parse_string(filter,&from))!=1)
+          {
+          if (m==0) filter->errmsg=CUS "from string expected";
+          return -1;
+          }
+        if (check_mail_address(filter,&from)!=1)
+          return -1;
+        }
+      else if (parse_identifier(filter,CUS ":addresses")==1)
+        {
+        if (parse_white(filter)==-1) return -1;
+        if ((m=parse_stringlist(filter,&addresses))!=1)
+          {
+          if (m==0) filter->errmsg=CUS "addresses string list expected";
+          return -1;
+          }
+        for (struct String * a = addresses; a->length != -1; ++a)
+          {
+          string_item * new = store_get(sizeof(string_item), GET_UNTAINTED);
+
+          new->text = store_get(a->length+1, a->character);
+          if (a->length) memcpy(new->text,a->character,a->length);
+          new->text[a->length]='\0';
+          new->next=aliases;
+          aliases=new;
+          }
+        }
+      else if (parse_identifier(filter,CUS ":mime")==1)
+        reason_is_mime=1;
+      else if (parse_identifier(filter,CUS ":handle")==1)
+        {
+        if (parse_white(filter)==-1) return -1;
+        if ((m=parse_string(filter,&from))!=1)
+          {
+          if (m==0) filter->errmsg=CUS "handle string expected";
+          return -1;
+          }
+        }
+      else break;
+      }
+    if (parse_white(filter)==-1) return -1;
+    if ((m=parse_string(filter,&reason))!=1)
+      {
+      if (m==0) filter->errmsg=CUS "missing reason string";
+      return -1;
+      }
+    if (reason_is_mime)
+      {
+      uschar *s,*end;
+
+      for (s = reason.character, end = reason.character + reason.length;
+	  s<end && (*s&0x80)==0; ) s++;
+      if (s<end)
+        {
+        filter->errmsg=CUS "MIME reason string contains 8bit text";
+        return -1;
+        }
+      }
+    if (parse_semicolon(filter)==-1) return -1;
+
+    if (exec)
+      {
+      address_item *addr;
+      md5 base;
+      uschar digest[16];
+      uschar hexdigest[33];
+      gstring * once;
+
+      if (filter_personal(aliases,TRUE))
+        {
+        if (filter_test == FTEST_NONE)
+          {
+          /* ensure oncelog directory exists; failure will be detected later */
+
+          (void)directory_make(NULL, filter->vacation_directory, 0700, FALSE);
+          }
+        /* build oncelog filename */
+
+        md5_start(&base);
+
+        if (handle.length==-1)
+          {
+	  gstring * key = NULL;
+          if (subject.length!=-1) key =string_catn(key, subject.character, subject.length);
+          if (from.length!=-1) key = string_catn(key, from.character, from.length);
+          key = string_catn(key, reason_is_mime?US"1":US"0", 1);
+          key = string_catn(key, reason.character, reason.length);
+	  md5_end(&base, key->s, key->ptr, digest);
+          }
+        else
+	  md5_end(&base, handle.character, handle.length, digest);
+
+        for (int i = 0; i < 16; i++) sprintf(CS (hexdigest+2*i), "%02X", digest[i]);
+
+        if ((filter_test != FTEST_NONE && debug_selector != 0) || (debug_selector & D_filter) != 0)
+          debug_printf("Sieve: mail was personal, vacation file basename: %s\n", hexdigest);
+
+        if (filter_test == FTEST_NONE)
+          {
+          once = string_cat (NULL, filter->vacation_directory);
+          once = string_catn(once, US"/", 1);
+          once = string_catn(once, hexdigest, 33);
+
+          /* process subject */
+
+          if (subject.length==-1)
+            {
+            uschar *subject_def;
+
+            subject_def = expand_string(US"${if def:header_subject {true}{false}}");
+            if (subject_def && Ustrcmp(subject_def,"true")==0)
+              {
+	      gstring * g = string_catn(NULL, US"Auto: ", 6);
+
+              expand_header(&subject,&str_subject);
+              g = string_catn(g, subject.character, subject.length);
+	      subject.character = string_from_gstring(g);
+              subject.length = g->ptr;
+              }
+            else
+              {
+              subject.character=US"Automated reply";
+              subject.length=Ustrlen(subject.character);
+              }
+            }
+
+          /* add address to list of generated addresses */
+
+          addr = deliver_make_addr(string_sprintf(">%.256s", sender_address), FALSE);
+          setflag(addr, af_pfr);
+          addr->prop.ignore_error = TRUE;
+          addr->next = *generated;
+          *generated = addr;
+          addr->reply = store_get(sizeof(reply_item), GET_UNTAINTED);
+          memset(addr->reply,0,sizeof(reply_item)); /* XXX */
+          addr->reply->to = string_copy(sender_address);
+          if (from.length==-1)
+            addr->reply->from = expand_string(US"$local_part@$domain");
+          else
+            addr->reply->from = from.character;
+	  /* deconst cast safe as we pass in a non-const item */
+          addr->reply->subject = US parse_quote_2047(subject.character, subject.length, US"utf-8", TRUE);
+          addr->reply->oncelog = string_from_gstring(once);
+          addr->reply->once_repeat=days*86400;
+
+          /* build body and MIME headers */
+
+          if (reason_is_mime)
+            {
+            uschar *mime_body,*reason_end;
+            static const uschar nlnl[]="\r\n\r\n";
+
+            for
+              (
+              mime_body = reason.character, reason_end = reason.character + reason.length;
+              mime_body < (reason_end-(sizeof(nlnl)-1)) && memcmp(mime_body, nlnl, (sizeof(nlnl)-1));
+	      ) mime_body++;
+
+            addr->reply->headers = string_copyn(reason.character, mime_body-reason.character);
+
+            if (mime_body+(sizeof(nlnl)-1)<reason_end) mime_body+=(sizeof(nlnl)-1);
+            else mime_body=reason_end-1;
+            addr->reply->text = string_copyn(mime_body, reason_end-mime_body);
+            }
+          else
+            {
+            struct String qp = { .character = NULL, .length = 0 };  /* Keep compiler happy (PH) */
+
+            addr->reply->headers = US"MIME-Version: 1.0\n"
+                                   "Content-Type: text/plain;\n"
+                                   "\tcharset=\"utf-8\"\n"
+                                   "Content-Transfer-Encoding: quoted-printable";
+            addr->reply->text = quoted_printable_encode(&reason,&qp)->character;
+            }
+          }
+        }
+        else if ((filter_test != FTEST_NONE && debug_selector != 0) || (debug_selector & D_filter) != 0)
+          debug_printf("Sieve: mail was not personal, vacation would ignore it\n");
+      }
+    }
+    else break;
+#endif
+  }
+return 1;
+}
+
+
+/*************************************************
+*       Parse and interpret a sieve filter       *
+*************************************************/
+
+/*
+Arguments:
+  filter      points to the Sieve filter including its state
+  exec        Execute parsed statements
+  generated   where to hang newly-generated addresses
+
+Returns:      1                success
+              -1               syntax or execution error
+*/
+
+static int
+parse_start(struct Sieve *filter, int exec, address_item **generated)
+{
+filter->pc=filter->filter;
+filter->line=1;
+filter->keep=1;
+filter->require_envelope=0;
+filter->require_fileinto=0;
+#ifdef ENCODED_CHARACTER
+filter->require_encoded_character=0;
+#endif
+#ifdef ENVELOPE_AUTH
+filter->require_envelope_auth=0;
+#endif
+#ifdef ENOTIFY
+filter->require_enotify=0;
+filter->notified=(struct Notification*)0;
+#endif
+#ifdef SUBADDRESS
+filter->require_subaddress=0;
+#endif
+#ifdef VACATION
+filter->require_vacation=0;
+filter->vacation_ran=0;
+#endif
+filter->require_copy=0;
+filter->require_iascii_numeric=0;
+
+if (parse_white(filter)==-1) return -1;
+
+if (exec && filter->vacation_directory && filter_test == FTEST_NONE)
+  {
+  DIR *oncelogdir;
+  struct dirent *oncelog;
+  struct stat properties;
+  time_t now;
+
+  /* clean up old vacation log databases */
+
+  if (  !(oncelogdir = exim_opendir(filter->vacation_directory))
+     && errno != ENOENT)
+    {
+    filter->errmsg = CUS "unable to open vacation directory";
+    return -1;
+    }
+
+  if (oncelogdir)
+    {
+    time(&now);
+
+    while ((oncelog = readdir(oncelogdir)))
+      if (strlen(oncelog->d_name)==32)
+        {
+        uschar *s = string_sprintf("%s/%s", filter->vacation_directory, oncelog->d_name);
+        if (Ustat(s,&properties) == 0 && properties.st_mtime+VACATION_MAX_DAYS*86400 < now)
+          Uunlink(s);
+        }
+    closedir(oncelogdir);
+    }
+  }
+
+while (parse_identifier(filter,CUS "require"))
+  {
+  /*
+  require-command = "require" <capabilities: string-list>
+  */
+
+  struct String *cap;
+  int m;
+
+  if (parse_white(filter)==-1) return -1;
+  if ((m=parse_stringlist(filter,&cap))!=1)
+    {
+    if (m==0) filter->errmsg=CUS "capability string list expected";
+    return -1;
+    }
+  for (struct String * check = cap; check->character; ++check)
+    {
+    if (eq_octet(check,&str_envelope,0)) filter->require_envelope=1;
+    else if (eq_octet(check,&str_fileinto,0)) filter->require_fileinto=1;
+#ifdef ENCODED_CHARACTER
+    else if (eq_octet(check,&str_encoded_character,0)) filter->require_encoded_character=1;
+#endif
+#ifdef ENVELOPE_AUTH
+    else if (eq_octet(check,&str_envelope_auth,0)) filter->require_envelope_auth=1;
+#endif
+#ifdef ENOTIFY
+    else if (eq_octet(check,&str_enotify,0))
+      {
+      if (!filter->enotify_mailto_owner)
+        {
+        filter->errmsg=CUS "enotify disabled";
+        return -1;
+        }
+        filter->require_enotify=1;
+      }
+#endif
+#ifdef SUBADDRESS
+    else if (eq_octet(check,&str_subaddress,0)) filter->require_subaddress=1;
+#endif
+#ifdef VACATION
+    else if (eq_octet(check,&str_vacation,0))
+      {
+      if (filter_test == FTEST_NONE && !filter->vacation_directory)
+        {
+        filter->errmsg=CUS "vacation disabled";
+        return -1;
+        }
+      filter->require_vacation=1;
+      }
+#endif
+    else if (eq_octet(check,&str_copy,0)) filter->require_copy=1;
+    else if (eq_octet(check,&str_comparator_ioctet,0)) ;
+    else if (eq_octet(check,&str_comparator_iascii_casemap,0)) ;
+    else if (eq_octet(check,&str_comparator_enascii_casemap,0)) ;
+    else if (eq_octet(check,&str_comparator_iascii_numeric,0)) filter->require_iascii_numeric=1;
+    else
+      {
+      filter->errmsg=CUS "unknown capability";
+      return -1;
+      }
+    }
+    if (parse_semicolon(filter)==-1) return -1;
+  }
+  if (parse_commands(filter,exec,generated)==-1) return -1;
+  if (*filter->pc)
+    {
+    filter->errmsg=CUS "syntax error";
+    return -1;
+    }
+  return 1;
+}
+
+
+/*************************************************
+*            Interpret a sieve filter file       *
+*************************************************/
+
+/*
+Arguments:
+  filter      points to the entire file, read into store as a single string
+  options     controls whether various special things are allowed, and requests
+              special actions (not currently used)
+  vacation_directory    where to store vacation "once" files
+  enotify_mailto_owner  owner of mailto notifications
+  useraddress string expression for :user part of address
+  subaddress  string expression for :subaddress part of address
+  generated   where to hang newly-generated addresses
+  error       where to pass back an error text
+
+Returns:      FF_DELIVERED     success, a significant action was taken
+              FF_NOTDELIVERED  success, no significant action
+              FF_DEFER         defer requested
+              FF_FAIL          fail requested
+              FF_FREEZE        freeze requested
+              FF_ERROR         there was a problem
+*/
+
+int
+sieve_interpret(const uschar * filter, int options,
+  const uschar * vacation_directory, const uschar * enotify_mailto_owner,
+  const uschar * useraddress, const uschar * subaddress,
+  address_item ** generated, uschar ** error)
+{
+struct Sieve sieve;
+int r;
+uschar * msg;
+
+DEBUG(D_route) debug_printf("Sieve: start of processing\n");
+sieve.filter = filter;
+
+if (!vacation_directory)
+  sieve.vacation_directory = NULL;
+else if (!(sieve.vacation_directory = expand_cstring(vacation_directory)))
+  {
+  *error = string_sprintf("failed to expand \"%s\" "
+    "(sieve_vacation_directory): %s", vacation_directory,
+    expand_string_message);
+  return FF_ERROR;
+  }
+
+if (!enotify_mailto_owner)
+  sieve.enotify_mailto_owner = NULL;
+else if (!(sieve.enotify_mailto_owner = expand_cstring(enotify_mailto_owner)))
+  {
+  *error = string_sprintf("failed to expand \"%s\" "
+    "(sieve_enotify_mailto_owner): %s", enotify_mailto_owner,
+    expand_string_message);
+  return FF_ERROR;
+  }
+
+sieve.useraddress = useraddress
+  ? useraddress : CUS "$local_part_prefix$local_part$local_part_suffix";
+sieve.subaddress = subaddress;
+
+#ifdef COMPILE_SYNTAX_CHECKER
+if (parse_start(&sieve, 0, generated) == 1)
+#else
+if (parse_start(&sieve, 1, generated) == 1)
+#endif
+  if (sieve.keep)
+    {
+    add_addr(generated, US"inbox", 1, 0, 0, 0);
+    msg = US"Implicit keep";
+    r = FF_DELIVERED;
+    }
+  else
+    {
+    msg = US"No implicit keep";
+    r = FF_DELIVERED;
+    }
+else
+  {
+  msg = string_sprintf("Sieve error: %s in line %d",sieve.errmsg,sieve.line);
+#ifdef COMPILE_SYNTAX_CHECKER
+  r = FF_ERROR;
+  *error = msg;
+#else
+  add_addr(generated,US"inbox",1,0,0,0);
+  r = FF_DELIVERED;
+#endif
+  }
+
+#ifndef COMPILE_SYNTAX_CHECKER
+if (filter_test != FTEST_NONE) printf("%s\n", (const char*) msg);
+  else debug_printf("%s\n", msg);
+#endif
+
+DEBUG(D_route) debug_printf("Sieve: end of processing\n");
+return r;
+}