Edit File: mmdf.c
/* ======================================================================== * Copyright 1988-2008 University of Washington * * Licensed under the Apache License, Version 2.0 (the "License"); * you may not use this file except in compliance with the License. * You may obtain a copy of the License at * * http://www.apache.org/licenses/LICENSE-2.0 * * * ======================================================================== */ /* * Program: MMDF mail routines * * Author: Mark Crispin * UW Technology * University of Washington * Seattle, WA 98195 * Internet: MRC@Washington.EDU * * Date: 20 December 1989 * Last Edited: 27 March 2008 */ #include <stdio.h> #include <ctype.h> #include <errno.h> extern int errno; /* just in case */ #include <signal.h> #include "mail.h" #include "osdep.h" #include <time.h> #include <sys/stat.h> #include "pseudo.h" #include "fdstring.h" #include "misc.h" #include "dummy.h" /* Supposedly, this page has everything the MMDF driver needs to know about * the MMDF delimiter. By changing these macros, the MMDF driver should * change with it. Note that if you change the length of MMDFHDRTXT you * also need to change the ISMMDF and RETIFMMDFWRD macros to reflect the new * size. */ /* Useful MMDF constants */ #define MMDFCHR '\01' /* MMDF character */ #define MMDFCHRS 0x01010101 /* MMDF header character spread in a word */ /* MMDF header text */ #define MMDFHDRTXT "\01\01\01\01\n" /* length of MMDF header text */ #define MMDFHDRLEN (sizeof (MMDFHDRTXT) - 1) /* Validate MMDF header * Accepts: pointer to candidate string to validate as an MMDF header * Returns: T if valid; else NIL */ #define ISMMDF(s) \ ((*(s) == MMDFCHR) && ((s)[1] == MMDFCHR) && ((s)[2] == MMDFCHR) && \ ((s)[3] == MMDFCHR) && ((s)[4] == '\n')) /* Return if a 32-bit word has the start of an MMDF header * Accepts: pointer to word of four bytes to validate as an MMDF header * Returns: pointer to MMDF header, else proceeds */ #define RETIFMMDFWRD(s) { \ if (s[3] == MMDFCHR) { \ if ((s[4] == MMDFCHR) && (s[5] == MMDFCHR) && (s[6] == MMDFCHR) && \ (s[7] == '\n')) return s + 3; \ else if (s[2] == MMDFCHR) { \ if ((s[4] == MMDFCHR) && (s[5] == MMDFCHR) && (s[6] == '\n')) \ return s + 2; \ else if (s[1] == MMDFCHR) { \ if ((s[4] == MMDFCHR) && (s[5] == '\n')) return s + 1; \ else if ((*s == MMDFCHR) && (s[4] == '\n')) return s; \ } \ } \ } \ } /* Validate line * Accepts: pointer to candidate string to validate as a From header * return pointer to end of date/time field * return pointer to offset from t of time (hours of ``mmm dd hh:mm'') * return pointer to offset from t of time zone (if non-zero) * Returns: t,ti,zn set if valid From string, else ti is NIL */ #define VALID(s,x,ti,zn) { \ ti = 0; \ if ((*s == 'F') && (s[1] == 'r') && (s[2] == 'o') && (s[3] == 'm') && \ (s[4] == ' ')) { \ for (x = s + 5; *x && *x != '\n'; x++); \ if (*x) { \ if (x - s >= 41) { \ for (zn = -1; x[zn] != ' '; zn--); \ if ((x[zn-1] == 'm') && (x[zn-2] == 'o') && (x[zn-3] == 'r') && \ (x[zn-4] == 'f') && (x[zn-5] == ' ') && (x[zn-6] == 'e') && \ (x[zn-7] == 't') && (x[zn-8] == 'o') && (x[zn-9] == 'm') && \ (x[zn-10] == 'e') && (x[zn-11] == 'r') && (x[zn-12] == ' '))\ x += zn - 12; \ } \ if (x - s >= 27) { \ if (x[-5] == ' ') { \ if (x[-8] == ':') zn = 0,ti = -5; \ else if (x[-9] == ' ') ti = zn = -9; \ else if ((x[-11] == ' ') && ((x[-10]=='+') || (x[-10]=='-'))) \ ti = zn = -11; \ } \ else if (x[-4] == ' ') { \ if (x[-9] == ' ') zn = -4,ti = -9; \ } \ else if (x[-6] == ' ') { \ if ((x[-11] == ' ') && ((x[-5] == '+') || (x[-5] == '-'))) \ zn = -6,ti = -11; \ } \ if (ti && !((x[ti - 3] == ':') && \ (x[ti -= ((x[ti - 6] == ':') ? 9 : 6)] == ' ') && \ (x[ti - 3] == ' ') && (x[ti - 7] == ' ') && \ (x[ti - 11] == ' '))) ti = 0; \ } \ } \ } \ } /* You are not expected to understand this macro, but read the next page if * you are not faint of heart. * * Known formats to the VALID macro are: * From user Wed Dec 2 05:53 1992 * BSD From user Wed Dec 2 05:53:22 1992 * SysV From user Wed Dec 2 05:53 PST 1992 * rn From user Wed Dec 2 05:53:22 PST 1992 * From user Wed Dec 2 05:53 -0700 1992 * emacs From user Wed Dec 2 05:53:22 -0700 1992 * From user Wed Dec 2 05:53 1992 PST * From user Wed Dec 2 05:53:22 1992 PST * From user Wed Dec 2 05:53 1992 -0700 * Solaris From user Wed Dec 2 05:53:22 1992 -0700 * * Plus all of the above with `` remote from xxx'' after it. Thank you very * much, smail and Solaris, for making my life considerably more complicated. */ /* * What? You want to understand the VALID macro anyway? Alright, since you * insist. Actually, it isn't really all that difficult, provided that you * take it step by step. * * Line 1 Initializes the return ti value to failure (0); * Lines 2-3 Validates that the 1st-5th characters are ``From ''. * Lines 4-5 Validates that there is an end of line and points x at it. * Lines 6-13 First checks to see if the line is at least 41 characters long. * If so, it scans backwards to find the rightmost space. From * that point, it scans backwards to see if the string matches * `` remote from''. If so, it sets x to point to the space at * the start of the string. * Line 14 Makes sure that there are at least 27 characters in the line. * Lines 15-20 Checks if the date/time ends with the year (there is a space * five characters back). If there is a colon three characters * further back, there is no timezone field, so zn is set to 0 * and ti is set in front of the year. Otherwise, there must * either to be a space four characters back for a three-letter * timezone, or a space six characters back followed by a + or - * for a numeric timezone; in either case, zn and ti become the * offset of the space immediately before it. * Lines 21-23 Are the failure case for line 14. If there is a space four * characters back, it is a three-letter timezone; there must be a * space for the year nine characters back. zn is the zone * offset; ti is the offset of the space. * Lines 24-27 Are the failure case for line 20. If there is a space six * characters back, it is a numeric timezone; there must be a * space eleven characters back and a + or - five characters back. * zn is the zone offset; ti is the offset of the space. * Line 28-31 If ti is valid, make sure that the string before ti is of the * form www mmm dd hh:mm or www mmm dd hh:mm:ss, otherwise * invalidate ti. There must be a colon three characters back * and a space six or nine characters back (depending upon * whether or not the character six characters back is a colon). * There must be a space three characters further back (in front * of the day), one seven characters back (in front of the month), * and one eleven characters back (in front of the day of week). * ti is set to be the offset of the space before the time. * * Why a macro? It gets invoked a *lot* in a tight loop. On some of the * newer pipelined machines it is faster being open-coded than it would be if * subroutines are called. * * Why does it scan backwards from the end of the line, instead of doing the * much easier forward scan? There is no deterministic way to parse the * ``user'' field, because it may contain unquoted spaces! Yes, I tested it to * see if unquoted spaces were possible. They are, and I've encountered enough * evil mail to be totally unwilling to trust that ``it will never happen''. */ /* Build parameters */ #define KODRETRY 15 /* kiss-of-death retry in seconds */ #define LOCKTIMEOUT 5 /* lock timeout in minutes */ /* MMDF I/O stream local data */ typedef struct mmdf_local { unsigned int dirty : 1; /* disk copy needs updating */ unsigned int ddirty : 1; /* double-dirty, ping becomes checkpoint */ unsigned int pseudo : 1; /* uses a pseudo message */ unsigned int appending : 1; /* don't mark new messages as old */ int fd; /* mailbox file descriptor */ int ld; /* lock file descriptor */ char *lname; /* lock file name */ off_t filesize; /* file size parsed */ time_t filetime; /* last file time */ unsigned char *buf; /* temporary buffer */ unsigned long buflen; /* current size of temporary buffer */ unsigned long uid; /* current text uid */ SIZEDTEXT text; /* current text */ unsigned long textlen; /* current text length */ char *line; /* returned line */ char *linebuf; /* line readin buffer */ unsigned long linebuflen; /* current line readin buffer length */ } MMDFLOCAL; /* Convenient access to local data */ #define LOCAL ((MMDFLOCAL *) stream->local) /* MMDF protected file structure */ typedef struct mmdf_file { MAILSTREAM *stream; /* current stream */ off_t curpos; /* current file position */ off_t protect; /* protected position */ off_t filepos; /* current last written file position */ char *buf; /* overflow buffer */ size_t buflen; /* current overflow buffer length */ char *bufpos; /* current buffer position */ } MMDFFILE; /* Function prototypes */ DRIVER *mmdf_valid (char *name); long mmdf_isvalid (char *name,char *tmp); long mmdf_isvalid_fd (int fd,char *tmp); void *mmdf_parameters (long function,void *value); void mmdf_scan (MAILSTREAM *stream,char *ref,char *pat,char *contents); void mmdf_list (MAILSTREAM *stream,char *ref,char *pat); void mmdf_lsub (MAILSTREAM *stream,char *ref,char *pat); long mmdf_create (MAILSTREAM *stream,char *mailbox); long mmdf_delete (MAILSTREAM *stream,char *mailbox); long mmdf_rename (MAILSTREAM *stream,char *old,char *newname); MAILSTREAM *mmdf_open (MAILSTREAM *stream); void mmdf_close (MAILSTREAM *stream,long options); char *mmdf_header (MAILSTREAM *stream,unsigned long msgno, unsigned long *length,long flags); long mmdf_text (MAILSTREAM *stream,unsigned long msgno,STRING *bs,long flags); char *mmdf_text_work (MAILSTREAM *stream,MESSAGECACHE *elt, unsigned long *length,long flags); void mmdf_flagmsg (MAILSTREAM *stream,MESSAGECACHE *elt); long mmdf_ping (MAILSTREAM *stream); void mmdf_check (MAILSTREAM *stream); long mmdf_expunge (MAILSTREAM *stream,char *sequence,long options); long mmdf_copy (MAILSTREAM *stream,char *sequence,char *mailbox,long options); long mmdf_append (MAILSTREAM *stream,char *mailbox,append_t af,void *data); int mmdf_collect_msg (MAILSTREAM *stream,FILE *sf,char *flags,char *date, STRING *msg); int mmdf_append_msgs (MAILSTREAM *stream,FILE *sf,FILE *df,SEARCHSET *set); void mmdf_abort (MAILSTREAM *stream); char *mmdf_file (char *dst,char *name); int mmdf_lock (char *file,int flags,int mode,DOTLOCK *lock,int op); void mmdf_unlock (int fd,MAILSTREAM *stream,DOTLOCK *lock); int mmdf_parse (MAILSTREAM *stream,DOTLOCK *lock,int op); char *mmdf_mbxline (MAILSTREAM *stream,STRING *bs,unsigned long *size); unsigned long mmdf_pseudo (MAILSTREAM *stream,char *hdr); unsigned long mmdf_xstatus (MAILSTREAM *stream,char *status,MESSAGECACHE *elt, unsigned long uid,long flag); long mmdf_rewrite (MAILSTREAM *stream,unsigned long *nexp,DOTLOCK *lock, long flags); long mmdf_extend (MAILSTREAM *stream,unsigned long size); void mmdf_write (MMDFFILE *f,char *s,unsigned long i); void mmdf_phys_write (MMDFFILE *f,char *buf,size_t size); /* MMDF mail routines */ /* Driver dispatch used by MAIL */ DRIVER mmdfdriver = { "mmdf", /* driver name */ /* driver flags */ DR_LOCAL|DR_MAIL|DR_LOCKING|DR_NONEWMAILRONLY|DR_XPOINT, (DRIVER *) NIL, /* next driver */ mmdf_valid, /* mailbox is valid for us */ mmdf_parameters, /* manipulate parameters */ mmdf_scan, /* scan mailboxes */ mmdf_list, /* list mailboxes */ mmdf_lsub, /* list subscribed mailboxes */ NIL, /* subscribe to mailbox */ NIL, /* unsubscribe from mailbox */ mmdf_create, /* create mailbox */ mmdf_delete, /* delete mailbox */ mmdf_rename, /* rename mailbox */ mail_status_default, /* status of mailbox */ mmdf_open, /* open mailbox */ mmdf_close, /* close mailbox */ NIL, /* fetch message "fast" attributes */ NIL, /* fetch message flags */ NIL, /* fetch overview */ NIL, /* fetch message envelopes */ mmdf_header, /* fetch message header */ mmdf_text, /* fetch message text */ NIL, /* fetch partial message text */ NIL, /* unique identifier */ NIL, /* message number */ NIL, /* modify flags */ mmdf_flagmsg, /* per-message modify flags */ NIL, /* search for message based on criteria */ NIL, /* sort messages */ NIL, /* thread messages */ mmdf_ping, /* ping mailbox to see if still alive */ mmdf_check, /* check for new messages */ mmdf_expunge, /* expunge deleted messages */ mmdf_copy, /* copy messages to another mailbox */ mmdf_append, /* append string message to mailbox */ NIL /* garbage collect stream */ }; /* prototype stream */ MAILSTREAM mmdfproto = {&mmdfdriver}; char *mmdfhdr = MMDFHDRTXT; /* MMDF header */ /* MMDF mail validate mailbox * Accepts: mailbox name * Returns: our driver if name is valid, NIL otherwise */ DRIVER *mmdf_valid (char *name) { char tmp[MAILTMPLEN]; return mmdf_isvalid (name,tmp) ? &mmdfdriver : NIL; } /* MMDF mail test for valid mailbox name * Accepts: mailbox name * scratch buffer * Returns: T if valid, NIL otherwise */ long mmdf_isvalid (char *name,char *tmp) { int fd; int ret = NIL; char *t,file[MAILTMPLEN]; struct stat sbuf; time_t tp[2]; errno = EINVAL; /* assume invalid argument */ /* must be non-empty file */ if ((t = dummy_file (file,name)) && !stat (t,&sbuf)) { if (!sbuf.st_size)errno = 0;/* empty file */ else if ((fd = open (file,O_RDONLY,NIL)) >= 0) { /* error -1 for invalid format */ if (!(ret = mmdf_isvalid_fd (fd,tmp))) errno = -1; close (fd); /* close the file */ /* \Marked status? */ if ((sbuf.st_ctime > sbuf.st_atime) || (sbuf.st_mtime > sbuf.st_atime)) { tp[0] = sbuf.st_atime; /* preserve atime and mtime */ tp[1] = sbuf.st_mtime; utime (file,tp); /* set the times */ } } } return ret; /* return what we should */ } /* MMDF mail test for valid mailbox * Accepts: file descriptor * scratch buffer * Returns: T if valid, NIL otherwise */ long mmdf_isvalid_fd (int fd,char *tmp) { int ret = NIL; memset (tmp,'\0',MAILTMPLEN); if (read (fd,tmp,MAILTMPLEN-1) >= 0) ret = ISMMDF (tmp) ? T : NIL; return ret; /* return what we should */ } /* MMDF manipulate driver parameters * Accepts: function code * function-dependent value * Returns: function-dependent return value */ void *mmdf_parameters (long function,void *value) { void *ret = NIL; switch ((int) function) { case GET_INBOXPATH: if (value) ret = dummy_file ((char *) value,"INBOX"); break; } return ret; } /* MMDF mail scan mailboxes * Accepts: mail stream * reference * pattern to search * string to scan */ void mmdf_scan (MAILSTREAM *stream,char *ref,char *pat,char *contents) { if (stream) dummy_scan (NIL,ref,pat,contents); } /* MMDF mail list mailboxes * Accepts: mail stream * reference * pattern to search */ void mmdf_list (MAILSTREAM *stream,char *ref,char *pat) { if (stream) dummy_list (NIL,ref,pat); } /* MMDF mail list subscribed mailboxes * Accepts: mail stream * reference * pattern to search */ void mmdf_lsub (MAILSTREAM *stream,char *ref,char *pat) { if (stream) dummy_lsub (NIL,ref,pat); } /* MMDF mail create mailbox * Accepts: MAIL stream * mailbox name to create * Returns: T on success, NIL on failure */ long mmdf_create (MAILSTREAM *stream,char *mailbox) { char *s,mbx[MAILTMPLEN],tmp[MAILTMPLEN]; long ret = NIL; int i,fd; time_t ti = time (0); if (!(s = dummy_file (mbx,mailbox))) { sprintf (tmp,"Can't create %.80s: invalid name",mailbox); MM_LOG (tmp,ERROR); } /* create underlying file */ else if (dummy_create_path (stream,s,get_dir_protection (mailbox))) { /* done if dir-only or whiner */ if (((s = strrchr (s,'/')) && !s[1]) || mail_parameters (NIL,GET_USERHASNOLIFE,NIL)) ret = T; else if ((fd = open (mbx,O_WRONLY, (long) mail_parameters (NIL,GET_MBXPROTECTION,NIL))) < 0) { sprintf (tmp,"Can't reopen mailbox node %.80s: %s",mbx,strerror (errno)); MM_LOG (tmp,ERROR); unlink (mbx); /* delete the file */ } else { /* initialize header */ memset (tmp,'\0',MAILTMPLEN); sprintf (tmp,"%sFrom %s %sDate: ",mmdfhdr,pseudo_from,ctime (&ti)); rfc822_date (s = tmp + strlen (tmp)); sprintf (s += strlen (s), /* write the pseudo-header */ "\nFrom: %s <%s@%s>\nSubject: %s\nX-IMAP: %010lu 0000000000", pseudo_name,pseudo_from,mylocalhost (),pseudo_subject, (unsigned long) ti); for (i = 0; i < NUSERFLAGS; ++i) if (default_user_flag (i)) sprintf (s += strlen (s)," %s",default_user_flag (i)); sprintf (s += strlen (s),"\nStatus: RO\n\n%s\n%s",pseudo_msg,mmdfhdr); if (write (fd,tmp,strlen (tmp)) > 0) ret = T; else { sprintf (tmp,"Can't initialize mailbox node %.80s: %s",mbx, strerror (errno)); MM_LOG (tmp,ERROR); unlink (mbx); /* delete the file */ } close (fd); /* close file */ } } /* set proper protections */ return ret ? set_mbx_protections (mailbox,mbx) : NIL; } /* MMDF mail delete mailbox * Accepts: MAIL stream * mailbox name to delete * Returns: T on success, NIL on failure */ long mmdf_delete (MAILSTREAM *stream,char *mailbox) { return mmdf_rename (stream,mailbox,NIL); } /* MMDF mail rename mailbox * Accepts: MAIL stream * old mailbox name * new mailbox name (or NIL for delete) * Returns: T on success, NIL on failure */ long mmdf_rename (MAILSTREAM *stream,char *old,char *newname) { long ret = NIL; char c,*s = NIL; char tmp[MAILTMPLEN],file[MAILTMPLEN],lock[MAILTMPLEN]; DOTLOCK lockx; int fd,ld; long i; struct stat sbuf; MM_CRITICAL (stream); /* get the c-client lock */ if (!dummy_file (file,old) || (newname && (!((s = mailboxfile (tmp,newname)) && *s) || ((s = strrchr (tmp,'/')) && !s[1])))) sprintf (tmp,newname ? "Can't rename mailbox %.80s to %.80s: invalid name" : "Can't delete mailbox %.80s: invalid name", old,newname); /* lock out other c-clients */ else if ((ld = lockname (lock,file,LOCK_EX|LOCK_NB,&i)) < 0) sprintf (tmp,"Mailbox %.80s is in use by another process",old); else { if ((fd = mmdf_lock (file,O_RDWR, (long) mail_parameters (NIL,GET_MBXPROTECTION,NIL), &lockx,LOCK_EX)) < 0) sprintf (tmp,"Can't lock mailbox %.80s: %s",old,strerror (errno)); else { if (newname) { /* want rename? */ /* found superior to destination name? */ if (s = strrchr (s,'/')) { c = *++s; /* remember first character of inferior */ *s = '\0'; /* tie off to get just superior */ /* name doesn't exist, create it */ if ((stat (tmp,&sbuf) || ((sbuf.st_mode & S_IFMT) != S_IFDIR)) && !dummy_create_path (stream,tmp,get_dir_protection (newname))) { mmdf_unlock (fd,NIL,&lockx); mmdf_unlock (ld,NIL,NIL); unlink (lock); MM_NOCRITICAL (stream); return ret; /* return success or failure */ } *s = c; /* restore full name */ } if (rename (file,tmp)) sprintf (tmp,"Can't rename mailbox %.80s to %.80s: %s",old,newname, strerror (errno)); else ret = T; /* set success */ } else if (unlink (file)) sprintf (tmp,"Can't delete mailbox %.80s: %s",old,strerror (errno)); else ret = T; /* set success */ mmdf_unlock (fd,NIL,&lockx); } mmdf_unlock (ld,NIL,NIL); /* flush the lock */ unlink (lock); } MM_NOCRITICAL (stream); /* no longer critical */ if (!ret) MM_LOG (tmp,ERROR); /* log error */ return ret; /* return success or failure */ } /* MMDF mail open * Accepts: Stream to open * Returns: Stream on success, NIL on failure */ MAILSTREAM *mmdf_open (MAILSTREAM *stream) { long i; int fd; char tmp[MAILTMPLEN]; DOTLOCK lock; long retry; /* return prototype for OP_PROTOTYPE call */ if (!stream) return user_flags (&mmdfproto); retry = stream->silent ? 1 : KODRETRY; if (stream->local) fatal ("mmdf recycle stream"); stream->local = memset (fs_get (sizeof (MMDFLOCAL)),0,sizeof (MMDFLOCAL)); /* note if an INBOX or not */ stream->inbox = !compare_cstring (stream->mailbox,"INBOX"); /* canonicalize the stream mailbox name */ if (!dummy_file (tmp,stream->mailbox)) { sprintf (tmp,"Can't open - invalid name: %.80s",stream->mailbox); MM_LOG (tmp,ERROR); return NIL; } /* flush old name */ fs_give ((void **) &stream->mailbox); /* save canonical name */ stream->mailbox = cpystr (tmp); LOCAL->fd = LOCAL->ld = -1; /* no file or state locking yet */ LOCAL->buf = (char *) fs_get (CHUNKSIZE); LOCAL->buflen = CHUNKSIZE - 1; LOCAL->text.data = (unsigned char *) fs_get (CHUNKSIZE); LOCAL->text.size = CHUNKSIZE - 1; LOCAL->linebuf = (char *) fs_get (CHUNKSIZE); LOCAL->linebuflen = CHUNKSIZE - 1; stream->sequence++; /* bump sequence number */ /* make lock for read/write access */ if (!stream->rdonly) while (retry) { /* try to lock file */ if ((fd = lockname (tmp,stream->mailbox,LOCK_EX|LOCK_NB,&i)) < 0) { /* suppressing kiss-of-death? */ if (stream->nokod) retry = 0; /* no, first time through? */ else if (retry-- == KODRETRY) { /* learned other guy's PID and can signal? */ if (i && !kill ((int) i,SIGUSR2)) { sprintf (tmp,"Trying to get mailbox lock from process %ld",i); MM_LOG (tmp,WARN); } else retry = 0; /* give up */ } if (!stream->silent) { /* nothing if silent stream */ if (retry) sleep (1); /* wait a second before trying again */ else MM_LOG ("Mailbox is open by another process, access is readonly", WARN); } } else { /* got the lock, nobody else can alter state */ LOCAL->ld = fd; /* note lock's fd and name */ LOCAL->lname = cpystr (tmp); /* make sure mode OK (don't use fchmod()) */ chmod (LOCAL->lname,(long) mail_parameters (NIL,GET_LOCKPROTECTION,NIL)); if (stream->silent) i = 0;/* silent streams won't accept KOD */ else { /* note our PID in the lock */ sprintf (tmp,"%d",getpid ()); write (fd,tmp,(i = strlen (tmp))+1); } ftruncate (fd,i); /* make sure tied off */ fsync (fd); /* make sure it's available */ retry = 0; /* no more need to try */ } } /* parse mailbox */ stream->nmsgs = stream->recent = 0; /* will we be able to get write access? */ if ((LOCAL->ld >= 0) && access (stream->mailbox,W_OK) && (errno == EACCES)) { MM_LOG ("Can't get write access to mailbox, access is readonly",WARN); flock (LOCAL->ld,LOCK_UN); /* release the lock */ close (LOCAL->ld); /* close the lock file */ LOCAL->ld = -1; /* no more lock fd */ unlink (LOCAL->lname); /* delete it */ } /* reset UID validity */ stream->uid_validity = stream->uid_last = 0; if (stream->silent && !stream->rdonly && (LOCAL->ld < 0)) mmdf_abort (stream); /* abort if can't get RW silent stream */ /* parse mailbox */ else if (mmdf_parse (stream,&lock,LOCK_SH)) { mmdf_unlock (LOCAL->fd,stream,&lock); mail_unlock (stream); MM_NOCRITICAL (stream); /* done with critical */ } if (!LOCAL) return NIL; /* failure if stream died */ /* make sure upper level knows readonly */ stream->rdonly = (LOCAL->ld < 0); /* notify about empty mailbox */ if (!(stream->nmsgs || stream->silent)) MM_LOG ("Mailbox is empty",NIL); if (!stream->rdonly) { /* flags stick if readwrite */ stream->perm_seen = stream->perm_deleted = stream->perm_flagged = stream->perm_answered = stream->perm_draft = T; if (!stream->uid_nosticky) {/* users with lives get permanent keywords */ stream->perm_user_flags = 0xffffffff; /* and maybe can create them too! */ stream->kwd_create = stream->user_flags[NUSERFLAGS-1] ? NIL : T; } } return stream; /* return stream alive to caller */ } /* MMDF mail close * Accepts: MAIL stream * close options */ void mmdf_close (MAILSTREAM *stream,long options) { int silent = stream->silent; stream->silent = T; /* go silent */ /* expunge if requested */ if (options & CL_EXPUNGE) mmdf_expunge (stream,NIL,NIL); /* else dump final checkpoint */ else if (LOCAL->dirty) mmdf_check (stream); stream->silent = silent; /* restore old silence state */ mmdf_abort (stream); /* now punt the file and local data */ } /* MMDF mail fetch message header * Accepts: MAIL stream * message # to fetch * pointer to returned header text length * option flags * Returns: message header in RFC822 format */ /* lines to filter from header */ static STRINGLIST *mmdf_hlines = NIL; char *mmdf_header (MAILSTREAM *stream,unsigned long msgno, unsigned long *length,long flags) { MESSAGECACHE *elt; unsigned char *s,*t,*tl; *length = 0; /* default to empty */ if (flags & FT_UID) return "";/* UID call "impossible" */ elt = mail_elt (stream,msgno);/* get cache */ if (!mmdf_hlines) { /* once only code */ STRINGLIST *lines = mmdf_hlines = mail_newstringlist (); lines->text.size = strlen ((char *) (lines->text.data = (unsigned char *) "Status")); lines = lines->next = mail_newstringlist (); lines->text.size = strlen ((char *) (lines->text.data = (unsigned char *) "X-Status")); lines = lines->next = mail_newstringlist (); lines->text.size = strlen ((char *) (lines->text.data = (unsigned char *) "X-Keywords")); lines = lines->next = mail_newstringlist (); lines->text.size = strlen ((char *) (lines->text.data = (unsigned char *) "X-UID")); lines = lines->next = mail_newstringlist (); lines->text.size = strlen ((char *) (lines->text.data = (unsigned char *) "X-IMAP")); lines = lines->next = mail_newstringlist (); lines->text.size = strlen ((char *) (lines->text.data = (unsigned char *) "X-IMAPbase")); } /* go to header position */ lseek (LOCAL->fd,elt->private.special.offset + elt->private.msg.header.offset,L_SET); if (flags & FT_INTERNAL) { /* initial data OK? */ if (elt->private.msg.header.text.size > LOCAL->buflen) { fs_give ((void **) &LOCAL->buf); LOCAL->buf = (char *) fs_get ((LOCAL->buflen = elt->private.msg.header.text.size) + 1); } /* read message */ read (LOCAL->fd,LOCAL->buf,elt->private.msg.header.text.size); /* got text, tie off string */ LOCAL->buf[*length = elt->private.msg.header.text.size] = '\0'; /* squeeze out CRs (in case from PC) */ for (s = t = LOCAL->buf,tl = LOCAL->buf + *length; t < tl; t++) if (*t != '\r') *s++ = *t; *s = '\0'; *length = s - LOCAL->buf; /* adjust length */ } else { /* need to make a CRLF version */ read (LOCAL->fd,s = (char *) fs_get (elt->private.msg.header.text.size+1), elt->private.msg.header.text.size); /* tie off string, and convert to CRLF */ s[elt->private.msg.header.text.size] = '\0'; *length = strcrlfcpy (&LOCAL->buf,&LOCAL->buflen,s, elt->private.msg.header.text.size); fs_give ((void **) &s); /* free readin buffer */ /* squeeze out spurious CRs */ for (s = t = LOCAL->buf,tl = LOCAL->buf + *length; t < tl; t++) if ((*t != '\r') || (t[1] == '\n')) *s++ = *t; *s = '\0'; *length = s - LOCAL->buf; /* adjust length */ } *length = mail_filter (LOCAL->buf,*length,mmdf_hlines,FT_NOT); return (char *) LOCAL->buf; /* return processed copy */ } /* MMDF mail fetch message text * Accepts: MAIL stream * message # to fetch * pointer to returned stringstruct * option flags * Returns: T on success, NIL if failure */ long mmdf_text (MAILSTREAM *stream,unsigned long msgno,STRING *bs,long flags) { char *s; unsigned long i; MESSAGECACHE *elt; /* UID call "impossible" */ if (flags & FT_UID) return NIL; elt = mail_elt (stream,msgno);/* get cache element */ /* if message not seen */ if (!(flags & FT_PEEK) && !elt->seen) { /* mark message seen and dirty */ elt->seen = elt->private.dirty = LOCAL->dirty = T; MM_FLAGS (stream,msgno); } s = mmdf_text_work (stream,elt,&i,flags); INIT (bs,mail_string,s,i); /* set up stringstruct */ return T; /* success */ } /* MMDF mail fetch message text worker routine * Accepts: MAIL stream * message cache element * pointer to returned header text length * option flags */ char *mmdf_text_work (MAILSTREAM *stream,MESSAGECACHE *elt, unsigned long *length,long flags) { FDDATA d; STRING bs; unsigned char c,*s,*t,*tl,tmp[CHUNKSIZE]; /* go to text position */ lseek (LOCAL->fd,elt->private.special.offset + elt->private.msg.text.offset,L_SET); if (flags & FT_INTERNAL) { /* initial data OK? */ if (elt->private.msg.text.text.size > LOCAL->buflen) { fs_give ((void **) &LOCAL->buf); LOCAL->buf = (char *) fs_get ((LOCAL->buflen = elt->private.msg.text.text.size) + 1); } /* read message */ read (LOCAL->fd,LOCAL->buf,elt->private.msg.text.text.size); /* got text, tie off string */ LOCAL->buf[*length = elt->private.msg.text.text.size] = '\0'; /* squeeze out CRs (in case from PC) */ for (s = t = LOCAL->buf,tl = LOCAL->buf + *length; t < tl; t++) if (*t != '\r') *s++ = *t; *s = '\0'; *length = s - LOCAL->buf; /* adjust length */ return (char *) LOCAL->buf; } /* have it cached already? */ if (elt->private.uid != LOCAL->uid) { /* not cached, cache it now */ LOCAL->uid = elt->private.uid; /* is buffer big enough? */ if (elt->rfc822_size > LOCAL->text.size) { /* excessively conservative, but the right thing is too hard to do */ fs_give ((void **) &LOCAL->text.data); LOCAL->text.data = (unsigned char *) fs_get ((LOCAL->text.size = elt->rfc822_size) + 1); } d.fd = LOCAL->fd; /* yes, set up file descriptor */ d.pos = elt->private.special.offset + elt->private.msg.text.offset; d.chunk = tmp; /* initial buffer chunk */ d.chunksize = CHUNKSIZE; /* file chunk size */ INIT (&bs,fd_string,&d,elt->private.msg.text.text.size); for (s = (char *) LOCAL->text.data; SIZE (&bs);) switch (c = SNX (&bs)) { case '\r': /* carriage return seen */ break; case '\n': *s++ = '\r'; /* insert a CR */ default: *s++ = c; /* copy characters */ } *s = '\0'; /* tie off buffer */ /* calculate length of cached data */ LOCAL->textlen = s - LOCAL->text.data; } *length = LOCAL->textlen; /* return from cache */ return (char *) LOCAL->text.data; } /* MMDF per-message modify flag * Accepts: MAIL stream * message cache element */ void mmdf_flagmsg (MAILSTREAM *stream,MESSAGECACHE *elt) { /* only after finishing */ if (elt->valid) elt->private.dirty = LOCAL->dirty = T; } /* MMDF mail ping mailbox * Accepts: MAIL stream * Returns: T if stream alive, else NIL */ long mmdf_ping (MAILSTREAM *stream) { DOTLOCK lock; struct stat sbuf; long reparse; /* big no-op if not readwrite */ if (LOCAL && (LOCAL->ld >= 0) && !stream->lock) { if (stream->rdonly) { /* does he want to give up readwrite? */ /* checkpoint if we changed something */ if (LOCAL->dirty) mmdf_check (stream); flock (LOCAL->ld,LOCK_UN);/* release readwrite lock */ close (LOCAL->ld); /* close the readwrite lock file */ LOCAL->ld = -1; /* no more readwrite lock fd */ unlink (LOCAL->lname); /* delete the readwrite lock file */ } else { /* see if need to reparse */ if (!(reparse = (long) mail_parameters (NIL,GET_NETFSSTATBUG,NIL))) { /* get current mailbox size */ if (LOCAL->fd >= 0) fstat (LOCAL->fd,&sbuf); else if (stat (stream->mailbox,&sbuf)) { sprintf (LOCAL->buf,"Mailbox stat failed, aborted: %s", strerror (errno)); MM_LOG (LOCAL->buf,ERROR); mmdf_abort (stream); return NIL; } reparse = (sbuf.st_size != LOCAL->filesize); } /* parse if mailbox changed */ if ((LOCAL->ddirty || reparse) && mmdf_parse (stream,&lock,LOCK_EX)) { /* force checkpoint if double-dirty */ if (LOCAL->ddirty) mmdf_rewrite (stream,NIL,&lock,NIL); /* unlock mailbox */ else mmdf_unlock (LOCAL->fd,stream,&lock); mail_unlock (stream); /* and stream */ /* done with critical */ MM_NOCRITICAL (stream); } } } return LOCAL ? LONGT : NIL; /* return if still alive */ } /* MMDF mail check mailbox * Accepts: MAIL stream */ void mmdf_check (MAILSTREAM *stream) { DOTLOCK lock; /* parse and lock mailbox */ if (LOCAL && (LOCAL->ld >= 0) && !stream->lock && mmdf_parse (stream,&lock,LOCK_EX)) { /* any unsaved changes? */ if (LOCAL->dirty && mmdf_rewrite (stream,NIL,&lock,NIL)) { if (!stream->silent) MM_LOG ("Checkpoint completed",NIL); } /* no checkpoint needed, just unlock */ else mmdf_unlock (LOCAL->fd,stream,&lock); mail_unlock (stream); /* unlock the stream */ MM_NOCRITICAL (stream); /* done with critical */ } } /* MMDF mail expunge mailbox * Accepts: MAIL stream * sequence to expunge if non-NIL * expunge options * Returns: T, always */ long mmdf_expunge (MAILSTREAM *stream,char *sequence,long options) { long ret; unsigned long i; DOTLOCK lock; char *msg = NIL; if (ret = (sequence ? ((options & EX_UID) ? mail_uid_sequence (stream,sequence) : mail_sequence (stream,sequence)) : LONGT) && LOCAL && (LOCAL->ld >= 0) && !stream->lock && mmdf_parse (stream,&lock,LOCK_EX)) { /* check expunged messages if not dirty */ for (i = 1; !LOCAL->dirty && (i <= stream->nmsgs); i++) { MESSAGECACHE *elt = mail_elt (stream,i); if (mail_elt (stream,i)->deleted) LOCAL->dirty = T; } if (!LOCAL->dirty) { /* not dirty and no expunged messages */ mmdf_unlock (LOCAL->fd,stream,&lock); msg = "No messages deleted, so no update needed"; } else if (mmdf_rewrite (stream,&i,&lock,sequence ? LONGT : NIL)) { if (i) sprintf (msg = LOCAL->buf,"Expunged %lu messages",i); else msg = "Mailbox checkpointed, but no messages expunged"; } /* rewrite failed */ else mmdf_unlock (LOCAL->fd,stream,&lock); mail_unlock (stream); /* unlock the stream */ MM_NOCRITICAL (stream); /* done with critical */ if (msg && !stream->silent) MM_LOG (msg,NIL); } else if (!stream->silent) MM_LOG ("Expunge ignored on readonly mailbox",WARN); return ret; } /* MMDF mail copy message(s) * Accepts: MAIL stream * sequence * destination mailbox * copy options * Returns: T if copy successful, else NIL */ long mmdf_copy (MAILSTREAM *stream,char *sequence,char *mailbox,long options) { struct stat sbuf; int fd; char *s,file[MAILTMPLEN]; DOTLOCK lock; time_t tp[2]; unsigned long i,j; MESSAGECACHE *elt; long ret = T; mailproxycopy_t pc = (mailproxycopy_t) mail_parameters (stream,GET_MAILPROXYCOPY,NIL); copyuid_t cu = (copyuid_t) (mail_parameters (NIL,GET_USERHASNOLIFE,NIL) ? NIL : mail_parameters (NIL,GET_COPYUID,NIL)); SEARCHSET *source = cu ? mail_newsearchset () : NIL; SEARCHSET *dest = cu ? mail_newsearchset () : NIL; MAILSTREAM *tstream = NIL; if (!((options & CP_UID) ? mail_uid_sequence (stream,sequence) : mail_sequence (stream,sequence))) return NIL; /* make sure destination is valid */ if (!(mmdf_valid (mailbox) || !errno)) switch (errno) { case ENOENT: /* no such file? */ if (compare_cstring (mailbox,"INBOX")) { MM_NOTIFY (stream,"[TRYCREATE] Must create mailbox before copy",NIL); return NIL; } if (pc) return (*pc) (stream,sequence,mailbox,options); mmdf_create (NIL,"INBOX");/* create empty INBOX */ case EACCES: /* file protected */ sprintf (LOCAL->buf,"Can't access destination: %.80s",mailbox); MM_LOG (LOCAL->buf,ERROR); return NIL; case EINVAL: if (pc) return (*pc) (stream,sequence,mailbox,options); sprintf (LOCAL->buf,"Invalid MMDF-format mailbox name: %.80s",mailbox); MM_LOG (LOCAL->buf,ERROR); return NIL; default: if (pc) return (*pc) (stream,sequence,mailbox,options); sprintf (LOCAL->buf,"Not a MMDF-format mailbox: %.80s",mailbox); MM_LOG (LOCAL->buf,ERROR); return NIL; } /* try to open rewrite for UIDPLUS */ if ((tstream = mail_open_work (&mmdfdriver,NIL,mailbox, OP_SILENT|OP_NOKOD)) && tstream->rdonly) tstream = mail_close (tstream); if (cu && !tstream) { /* wanted a COPYUID? */ sprintf (LOCAL->buf,"Unable to write-open mailbox for COPYUID: %.80s", mailbox); MM_LOG (LOCAL->buf,WARN); cu = NIL; /* don't try to do COPYUID */ } LOCAL->buf[0] = '\0'; MM_CRITICAL (stream); /* go critical */ if ((fd = mmdf_lock (dummy_file (file,mailbox),O_WRONLY|O_APPEND, (long) mail_parameters (NIL,GET_MBXPROTECTION,NIL), &lock,LOCK_EX)) < 0) { MM_NOCRITICAL (stream); /* done with critical */ sprintf (LOCAL->buf,"Can't open destination mailbox: %s",strerror (errno)); MM_LOG (LOCAL->buf,ERROR); /* log the error */ return NIL; /* failed */ } fstat (fd,&sbuf); /* get current file size */ /* write all requested messages to mailbox */ for (i = 1; ret && (i <= stream->nmsgs); i++) if ((elt = mail_elt (stream,i))->sequence) { lseek (LOCAL->fd,elt->private.special.offset,L_SET); read (LOCAL->fd,LOCAL->buf,elt->private.special.text.size); if (write (fd,LOCAL->buf,elt->private.special.text.size) < 0) ret = NIL; else { /* internal header succeeded */ s = mmdf_header (stream,i,&j,FT_INTERNAL); /* header size, sans trailing newline */ if (j && (s[j - 2] == '\n')) j--; if (write (fd,s,j) < 0) ret = NIL; else { /* message header succeeded */ j = tstream ? /* write UIDPLUS data if have readwrite */ mmdf_xstatus (stream,LOCAL->buf,elt,++(tstream->uid_last),LONGT) : mmdf_xstatus (stream,LOCAL->buf,elt,NIL,NIL); if (write (fd,LOCAL->buf,j) < 0) ret = NIL; else { /* message status succeeded */ s = mmdf_text_work (stream,elt,&j,FT_INTERNAL); if ((write (fd,s,j) < 0) || (write (fd,mmdfhdr,MMDFHDRLEN) < 0)) ret = NIL; else if (cu) { /* need to pass back new UID? */ mail_append_set (source,mail_uid (stream,i)); mail_append_set (dest,tstream->uid_last); } } } } } if (!ret || fsync (fd)) { /* force out the update */ sprintf (LOCAL->buf,"Message copy failed: %s",strerror (errno)); ftruncate (fd,sbuf.st_size); ret = NIL; } /* force UIDVALIDITY assignment now */ if (tstream && !tstream->uid_validity) tstream->uid_validity = time (0); /* return sets if doing COPYUID */ if (cu && ret) (*cu) (stream,mailbox,tstream->uid_validity,source,dest); else { /* flush any sets we may have built */ mail_free_searchset (&source); mail_free_searchset (&dest); } tp[1] = time (0); /* set mtime to now */ if (ret) tp[0] = tp[1] - 1; /* set atime to now-1 if successful copy */ else tp[0] = /* else preserve \Marked status */ ((sbuf.st_ctime > sbuf.st_atime) || (sbuf.st_mtime > sbuf.st_atime)) ? sbuf.st_atime : tp[1]; utime (file,tp); /* set the times */ mmdf_unlock (fd,NIL,&lock); /* unlock and close mailbox */ if (tstream) { /* update last UID if we can */ MMDFLOCAL *local = (MMDFLOCAL *) tstream->local; local->dirty = T; /* do a rewrite */ local->appending = T; /* but not at the cost of marking as old */ tstream = mail_close (tstream); } /* log the error */ if (!ret) MM_LOG (LOCAL->buf,ERROR); /* delete if requested message */ else if (options & CP_MOVE) for (i = 1; i <= stream->nmsgs; i++) if ((elt = mail_elt (stream,i))->sequence) elt->deleted = elt->private.dirty = LOCAL->dirty = T; MM_NOCRITICAL (stream); /* release critical */ return ret; } /* MMDF mail append message from stringstruct * Accepts: MAIL stream * destination mailbox * append callback * data for callback * Returns: T if append successful, else NIL */ #define BUFLEN 8*MAILTMPLEN long mmdf_append (MAILSTREAM *stream,char *mailbox,append_t af,void *data) { struct stat sbuf; int fd; unsigned long i; char *flags,*date,buf[BUFLEN],tmp[MAILTMPLEN],file[MAILTMPLEN]; time_t tp[2]; FILE *sf,*df; MESSAGECACHE elt; DOTLOCK lock; STRING *message; unsigned long uidlocation = 0; appenduid_t au = (appenduid_t) (mail_parameters (NIL,GET_USERHASNOLIFE,NIL) ? NIL : mail_parameters (NIL,GET_APPENDUID,NIL)); SEARCHSET *dst = au ? mail_newsearchset () : NIL; long ret = LONGT; MAILSTREAM *tstream = NIL; /* default stream to prototype */ if (!stream) { /* stream specified? */ stream = &mmdfproto; /* no, default stream to prototype */ for (i = 0; i < NUSERFLAGS && stream->user_flags[i]; ++i) fs_give ((void **) &stream->user_flags[i]); } if (!mmdf_valid (mailbox)) switch (errno) { case ENOENT: /* no such file? */ if (compare_cstring (mailbox,"INBOX")) { MM_NOTIFY (stream,"[TRYCREATE] Must create mailbox before append",NIL); return NIL; } mmdf_create (NIL,"INBOX"); /* create empty INBOX */ case 0: /* merely empty file? */ tstream = stream; break; case EACCES: /* file protected */ sprintf (tmp,"Can't access destination: %.80s",mailbox); MM_LOG (tmp,ERROR); return NIL; case EINVAL: sprintf (tmp,"Invalid MMDF-format mailbox name: %.80s",mailbox); MM_LOG (tmp,ERROR); return NIL; default: sprintf (tmp,"Not a MMDF-format mailbox: %.80s",mailbox); MM_LOG (tmp,ERROR); return NIL; } /* get sniffing stream for keywords */ else if (!(tstream = mail_open (NIL,mailbox, OP_READONLY|OP_SILENT|OP_NOKOD|OP_SNIFF))) { sprintf (tmp,"Unable to examine mailbox for APPEND: %.80s",mailbox); MM_LOG (tmp,ERROR); return NIL; } /* get first message */ if (!MM_APPEND (af) (tstream,data,&flags,&date,&message)) return NIL; if (!(sf = tmpfile ())) { /* must have scratch file */ sprintf (tmp,".%lx.%lx",(unsigned long) time (0),(unsigned long)getpid ()); if (!stat (tmp,&sbuf) || !(sf = fopen (tmp,"wb+"))) { sprintf (tmp,"Unable to create scratch file: %.80s",strerror (errno)); MM_LOG (tmp,ERROR); return NIL; } unlink (tmp); } do { /* parse date */ if (!date) rfc822_date (date = tmp); if (!mail_parse_date (&elt,date)) { sprintf (tmp,"Bad date in append: %.80s",date); MM_LOG (tmp,ERROR); } else { /* user wants to suppress time zones? */ if (mail_parameters (NIL,GET_NOTIMEZONES,NIL)) { time_t when = mail_longdate (&elt); date = ctime (&when); /* use traditional date */ } /* use POSIX-style date */ else date = mail_cdate (tmp,&elt); if (!SIZE (message)) MM_LOG ("Append of zero-length message",ERROR); else if (!mmdf_collect_msg (tstream,sf,flags,date,message)) { sprintf (tmp,"Error writing scratch file: %.80s",strerror (errno)); MM_LOG (tmp,ERROR); } /* get next message */ else if (MM_APPEND (af) (tstream,data,&flags,&date,&message)) continue; } fclose (sf); /* punt scratch file */ return NIL; /* give up */ } while (message); /* until no more messages */ if (fflush (sf)) { sprintf (tmp,"Error finishing scratch file: %.80s",strerror (errno)); MM_LOG (tmp,ERROR); fclose (sf); /* punt scratch file */ return NIL; /* give up */ } i = ftell (sf); /* size of scratch file */ if (tstream != stream) tstream = mail_close (tstream); MM_CRITICAL (stream); /* go critical */ /* try to open readwrite for UIDPLUS */ if ((tstream = mail_open_work (&mmdfdriver,NIL,mailbox, OP_SILENT|OP_NOKOD)) && tstream->rdonly) tstream = mail_close (tstream); if (au && !tstream) { /* wanted an APPENDUID? */ sprintf (tmp,"Unable to re-open mailbox for APPENDUID: %.80s",mailbox); MM_LOG (tmp,WARN); au = NIL; } if (((fd = mmdf_lock (dummy_file (file,mailbox),O_WRONLY|O_APPEND, (long) mail_parameters (NIL,GET_MBXPROTECTION,NIL), &lock,LOCK_EX)) < 0) || !(df = fdopen (fd,"ab"))) { MM_NOCRITICAL (stream); /* done with critical */ sprintf (tmp,"Can't open append mailbox: %s",strerror (errno)); MM_LOG (tmp,ERROR); return NIL; } fstat (fd,&sbuf); /* get current file size */ rewind (sf); tp[1] = time (0); /* set mtime to now */ /* write all messages */ if (!mmdf_append_msgs (tstream,sf,df,au ? dst : NIL) || (fflush (df) == EOF) || fsync (fd)) { sprintf (buf,"Message append failed: %s",strerror (errno)); MM_LOG (buf,ERROR); ftruncate (fd,sbuf.st_size); tp[0] = /* preserve \Marked status */ ((sbuf.st_ctime > sbuf.st_atime) || (sbuf.st_mtime > sbuf.st_atime)) ? sbuf.st_atime : tp[1]; ret = NIL; /* return error */ } else tp[0] = tp[1] - 1; /* set atime to now-1 if successful copy */ utime (file,tp); /* set the times */ fclose (sf); /* done with scratch file */ /* force UIDVALIDITY assignment now */ if (tstream && !tstream->uid_validity) tstream->uid_validity = time (0); /* return sets if doing APPENDUID */ if (au && ret) (*au) (mailbox,tstream->uid_validity,dst); else mail_free_searchset (&dst); mmdf_unlock (fd,NIL,&lock); /* unlock and close mailbox */ fclose (df); if (tstream) { /* update last UID if we can */ MMDFLOCAL *local = (MMDFLOCAL *) tstream->local; local->dirty = T; /* do a rewrite */ local->appending = T; /* but not at the cost of marking as old */ tstream = mail_close (tstream); } MM_NOCRITICAL (stream); /* release critical */ return ret; } /* Collect and write single message to append scratch file * Accepts: MAIL stream * scratch file * flags * date * message stringstruct * Returns: NIL if write error, else T */ int mmdf_collect_msg (MAILSTREAM *stream,FILE *sf,char *flags,char *date, STRING *msg) { unsigned char *s,*t; unsigned long uf; long f = mail_parse_flags (stream,flags,&uf); /* write metadata, note date ends with NL */ if (fprintf (sf,"%ld %lu %s",f,SIZE (msg) + 1,date) < 0) return NIL; while (uf) /* write user flags */ if ((s = stream->user_flags[find_rightmost_bit (&uf)]) && (fprintf (sf," %s",s) < 0)) return NIL; if (putc ('\n',sf) == EOF) return NIL; while (SIZE (msg)) { /* copy text to scratch file */ for (s = (unsigned char *) msg->curpos, t = s + msg->cursize; s < t; ++s) if (!*s) *s = 0x80; /* disallow NUL */ /* write buffered text */ if (fwrite (msg->curpos,1,msg->cursize,sf) == msg->cursize) SETPOS (msg,GETPOS (msg) + msg->cursize); else return NIL; /* failed */ } /* write trailing newline and return */ return (putc ('\n',sf) == EOF) ? NIL : T; } /* Append messages from scratch file to mailbox * Accepts: MAIL stream * source file * destination file * uidset to update if non-NIL * Returns: T if success, NIL if failure */ int mmdf_append_msgs (MAILSTREAM *stream,FILE *sf,FILE *df,SEARCHSET *set) { int c; long f; unsigned long i,j; char *x,tmp[MAILTMPLEN]; int hdrp = T; /* get message metadata line */ while (fgets (tmp,MAILTMPLEN,sf)) { if (!(isdigit (tmp[0]) && strchr (tmp,'\n'))) return NIL; f = strtol (tmp,&x,10); /* get flags */ if (!((*x++ == ' ') && isdigit (*x))) return NIL; i = strtoul (x,&x,10); /* get message size */ if ((*x++ != ' ') || /* build initial header */ (fprintf (df,"%sFrom %s@%s %sStatus: ",mmdfhdr,myusername(), mylocalhost(),x) < 0) || (f&fSEEN && (putc ('R',df) == EOF)) || (fputs ("\nX-Status: ",df) == EOF) || (f&fDELETED && (putc ('D',df) == EOF)) || (f&fFLAGGED && (putc ('F',df) == EOF)) || (f&fANSWERED && (putc ('A',df) == EOF)) || (f&fDRAFT && (putc ('T',df) == EOF)) || (fputs ("\nX-Keywords:",df) == EOF)) return NIL; /* copy keywords */ while ((c = getc (sf)) != '\n') switch (c) { case EOF: return NIL; default: if (putc (c,df) == EOF) return NIL; } if ((putc ('\n',df) == EOF) || (set && (fprintf (df,"X-UID: %lu\n",++(stream->uid_last)) < 0))) return NIL; for (c = '\n'; i && fgets (tmp,MAILTMPLEN,sf); c = tmp[j-1]) { /* get read line length */ if (i < (j = strlen (tmp))) fatal ("mmdf_append_msgs overrun"); i -= j; /* number of bytes left */ /* squish out ^A and CRs (note copies NUL) */ for (x = tmp; x = strpbrk (x,"\01\r"); --j) memmove (x,x+1,j-(x-tmp)); if (!j) continue; /* do nothing if line emptied */ /* start of line? */ if ((c == '\n')) switch (tmp[0]) { case 'S': case 's': /* possible "Status:" */ if (hdrp && (j > 6) && ((tmp[1] == 't') || (tmp[1] == 'T')) && ((tmp[2] == 'a') || (tmp[2] == 'A')) && ((tmp[3] == 't') || (tmp[3] == 'T')) && ((tmp[4] == 'u') || (tmp[4] == 'U')) && ((tmp[5] == 's') || (tmp[5] == 'S')) && (tmp[6] == ':') && (fputs ("X-Original-",df) == EOF)) return NIL; break; case 'X': case 'x': /* possible X-??? header */ if (hdrp && (tmp[1] == '-') && /* possible X-UID: */ (((j > 5) && ((tmp[2] == 'U') || (tmp[2] == 'u')) && ((tmp[3] == 'I') || (tmp[3] == 'i')) && ((tmp[4] == 'D') || (tmp[4] == 'd')) && (tmp[5] == ':')) || /* possible X-IMAP: */ ((j > 6) && ((tmp[2] == 'I') || (tmp[2] == 'i')) && ((tmp[3] == 'M') || (tmp[3] == 'm')) && ((tmp[4] == 'A') || (tmp[4] == 'a')) && ((tmp[5] == 'P') || (tmp[5] == 'p')) && ((tmp[6] == ':') || /* or X-IMAPbase: */ ((j > 10) && ((tmp[6] == 'b') || (tmp[6] == 'B')) && ((tmp[7] == 'a') || (tmp[7] == 'A')) && ((tmp[8] == 's') || (tmp[8] == 'S')) && ((tmp[9] == 'e') || (tmp[9] == 'E')) && (tmp[10] == ':')))) || /* possible X-Status: */ ((j > 8) && ((tmp[2] == 'S') || (tmp[2] == 's')) && ((tmp[3] == 't') || (tmp[3] == 'T')) && ((tmp[4] == 'a') || (tmp[4] == 'A')) && ((tmp[5] == 't') || (tmp[5] == 'T')) && ((tmp[6] == 'u') || (tmp[6] == 'U')) && ((tmp[7] == 's') || (tmp[7] == 'S')) && (tmp[8] == ':')) || /* possible X-Keywords: */ ((j > 10) && ((tmp[2] == 'K') || (tmp[2] == 'k')) && ((tmp[3] == 'e') || (tmp[3] == 'E')) && ((tmp[4] == 'y') || (tmp[4] == 'Y')) && ((tmp[5] == 'w') || (tmp[5] == 'W')) && ((tmp[6] == 'o') || (tmp[6] == 'O')) && ((tmp[7] == 'r') || (tmp[7] == 'R')) && ((tmp[8] == 'd') || (tmp[8] == 'D')) && ((tmp[9] == 's') || (tmp[9] == 'S')) && (tmp[10] == ':'))) && (fputs ("X-Original-",df) == EOF)) return NIL; break; case '\n': /* blank line */ hdrp = NIL; break; default: /* nothing to do */ break; } /* just write the line */ if (fwrite (tmp,1,j,df) != j) return NIL; } /* make sure read entire msg & wrote trailer */ if (i || (fputs (mmdfhdr,df) == EOF)) return NIL; /* update set */ if (stream) mail_append_set (set,stream->uid_last); } return T; } /* Internal routines */ /* MMDF mail abort stream * Accepts: MAIL stream */ void mmdf_abort (MAILSTREAM *stream) { if (LOCAL) { /* only if a file is open */ if (LOCAL->fd >= 0) close (LOCAL->fd); if (LOCAL->ld >= 0) { /* have a mailbox lock? */ flock (LOCAL->ld,LOCK_UN);/* yes, release the lock */ close (LOCAL->ld); /* close the lock file */ unlink (LOCAL->lname); /* and delete it */ } if (LOCAL->lname) fs_give ((void **) &LOCAL->lname); /* free local text buffers */ if (LOCAL->buf) fs_give ((void **) &LOCAL->buf); if (LOCAL->text.data) fs_give ((void **) &LOCAL->text.data); if (LOCAL->linebuf) fs_give ((void **) &LOCAL->linebuf); if (LOCAL->line) fs_give ((void **) &LOCAL->line); /* nuke the local data */ fs_give ((void **) &stream->local); stream->dtb = NIL; /* log out the DTB */ } } /* MMDF open and lock mailbox * Accepts: file name to open/lock * file open mode * destination buffer for lock file name * type of locking operation (LOCK_SH or LOCK_EX) */ int mmdf_lock (char *file,int flags,int mode,DOTLOCK *lock,int op) { int fd; blocknotify_t bn = (blocknotify_t) mail_parameters (NIL,GET_BLOCKNOTIFY,NIL); (*bn) (BLOCK_FILELOCK,NIL); /* try locking the easy way */ if (dotlock_lock (file,lock,-1)) { /* got dotlock file, easy open */ if ((fd = open (file,flags,mode)) >= 0) flock (fd,op); else dotlock_unlock (lock); /* open failed, free the dotlock */ } /* no dot lock file, open file now */ else if ((fd = open (file,flags,mode)) >= 0) { /* try paranoid way to make a dot lock file */ if (dotlock_lock (file,lock,fd)) { close (fd); /* get fresh fd in case of timing race */ if ((fd = open (file,flags,mode)) >= 0) flock (fd,op); /* open failed, free the dotlock */ else dotlock_unlock (lock); } else flock (fd,op); /* paranoid way failed, just flock() it */ } (*bn) (BLOCK_NONE,NIL); return fd; } /* MMDF unlock and close mailbox * Accepts: file descriptor * (optional) mailbox stream to check atime/mtime * (optional) lock file name */ void mmdf_unlock (int fd,MAILSTREAM *stream,DOTLOCK *lock) { if (stream) { /* need to muck with times? */ struct stat sbuf; time_t tp[2]; time_t now = time (0); fstat (fd,&sbuf); /* get file times */ if (LOCAL->ld >= 0) { /* yes, readwrite session? */ tp[0] = now; /* set atime to now */ /* set mtime to (now - 1) if necessary */ tp[1] = (now > sbuf.st_mtime) ? sbuf.st_mtime : now - 1; } else if (stream->recent) { /* readonly with recent messages */ if ((sbuf.st_atime >= sbuf.st_mtime) || (sbuf.st_atime >= sbuf.st_ctime)) /* keep past mtime, whack back atime */ tp[0] = (tp[1] = (sbuf.st_mtime < now) ? sbuf.st_mtime : now) - 1; else now = 0; /* no time change needed */ } /* readonly with no recent messages */ else if ((sbuf.st_atime < sbuf.st_mtime) || (sbuf.st_atime < sbuf.st_ctime)) { tp[0] = now; /* set atime to now */ /* set mtime to (now - 1) if necessary */ tp[1] = (now > sbuf.st_mtime) ? sbuf.st_mtime : now - 1; } else now = 0; /* no time change needed */ /* set the times, note change */ if (now && !utime (stream->mailbox,tp)) LOCAL->filetime = tp[1]; } flock (fd,LOCK_UN); /* release flock'ers */ if (!stream) close (fd); /* close the file if no stream */ dotlock_unlock (lock); /* flush the lock file if any */ } /* MMDF mail parse and lock mailbox * Accepts: MAIL stream * space to write lock file name * type of locking operation * Returns: T if parse OK, critical & mailbox is locked shared; NIL if failure */ int mmdf_parse (MAILSTREAM *stream,DOTLOCK *lock,int op) { int ti,zn,m; unsigned long i,j,k; unsigned char c,*s,*t,*u,tmp[MAILTMPLEN],date[30]; int retain = T; unsigned long nmsgs = stream->nmsgs; unsigned long prevuid = nmsgs ? mail_elt (stream,nmsgs)->private.uid : 0; unsigned long recent = stream->recent; unsigned long oldnmsgs = stream->nmsgs; short silent = stream->silent; short pseudoseen = NIL; struct stat sbuf; STRING bs; FDDATA d; MESSAGECACHE *elt; mail_lock (stream); /* guard against recursion or pingers */ /* toss out previous descriptor */ if (LOCAL->fd >= 0) close (LOCAL->fd); MM_CRITICAL (stream); /* open and lock mailbox (shared OK) */ if ((LOCAL->fd = mmdf_lock (stream->mailbox,(LOCAL->ld >= 0) ? O_RDWR : O_RDONLY, (long)mail_parameters(NIL,GET_MBXPROTECTION,NIL), lock,op)) < 0) { sprintf (tmp,"Mailbox open failed, aborted: %s",strerror (errno)); MM_LOG (tmp,ERROR); mmdf_abort (stream); mail_unlock (stream); MM_NOCRITICAL (stream); /* done with critical */ return NIL; } fstat (LOCAL->fd,&sbuf); /* get status */ /* validate change in size */ if (sbuf.st_size < LOCAL->filesize) { sprintf (tmp,"Mailbox shrank from %lu to %lu bytes, aborted", (unsigned long) LOCAL->filesize,(unsigned long) sbuf.st_size); MM_LOG (tmp,ERROR); /* this is pretty bad */ mmdf_unlock (LOCAL->fd,stream,lock); mmdf_abort (stream); mail_unlock (stream); MM_NOCRITICAL (stream); /* done with critical */ return NIL; } /* new data? */ else if (i = sbuf.st_size - LOCAL->filesize) { d.fd = LOCAL->fd; /* yes, set up file descriptor */ d.pos = LOCAL->filesize; /* get to that position in the file */ d.chunk = LOCAL->buf; /* initial buffer chunk */ d.chunksize = CHUNKSIZE; /* file chunk size */ INIT (&bs,fd_string,&d,i); /* initialize stringstruct */ /* skip leading whitespace for broken MTAs */ while (((c = CHR (&bs)) == '\n') || (c == '\r') || (c == ' ') || (c == '\t')) SNX (&bs); if (SIZE (&bs)) { /* read new data */ /* remember internal header position */ j = LOCAL->filesize + GETPOS (&bs); s = mmdf_mbxline (stream,&bs,&i); stream->silent = T; /* quell main program new message events */ do { /* read MMDF header */ if (!(i && ISMMDF (s))){/* see if valid MMDF header */ sprintf (tmp,"Unexpected changes to mailbox (try restarting): %.20s", (char *) s); /* see if we can back up to a line */ if (i && (j > MMDFHDRLEN)) { SETPOS (&bs,j -= MMDFHDRLEN); /* read previous line */ s = mmdf_mbxline (stream,&bs,&i); /* kill the error if it looks good */ if (i && ISMMDF (s)) tmp[0] = '\0'; } if (tmp[0]) { MM_LOG (tmp,ERROR); mmdf_unlock (LOCAL->fd,stream,lock); mmdf_abort (stream); mail_unlock (stream); MM_NOCRITICAL (stream); return NIL; } } /* instantiate first new message */ mail_exists (stream,++nmsgs); (elt = mail_elt (stream,nmsgs))->valid = T; recent++; /* assume recent by default */ elt->recent = T; /* note position/size of internal header */ elt->private.special.offset = j; elt->private.special.text.size = i; s = mmdf_mbxline (stream,&bs,&i); ti = 0; /* assume not a valid date */ zn = 0,t = NIL; if (i) VALID (s,t,ti,zn); if (ti) { /* generate plausible IMAPish date string */ /* this is also part of header */ elt->private.special.text.size += i; date[2] = date[6] = date[20] = '-'; date[11] = ' '; date[14] = date[17] = ':'; /* dd */ date[0] = t[ti - 2]; date[1] = t[ti - 1]; /* mmm */ date[3] = t[ti - 6]; date[4] = t[ti - 5]; date[5] = t[ti - 4]; /* hh */ date[12] = t[ti + 1]; date[13] = t[ti + 2]; /* mm */ date[15] = t[ti + 4]; date[16] = t[ti + 5]; if (t[ti += 6]==':'){ /* ss */ date[18] = t[++ti]; date[19] = t[++ti]; ti++; /* move to space */ } else date[18] = date[19] = '0'; /* yy -- advance over timezone if necessary */ if (zn == ti) ti += (((t[zn+1] == '+') || (t[zn+1] == '-')) ? 6 : 4); date[7] = t[ti + 1]; date[8] = t[ti + 2]; date[9] = t[ti + 3]; date[10] = t[ti + 4]; /* zzz */ t = zn ? (t + zn + 1) : (unsigned char *) "LCL"; date[21] = *t++; date[22] = *t++; date[23] = *t++; if ((date[21] != '+') && (date[21] != '-')) date[24] = '\0'; else { /* numeric time zone */ date[24] = *t++; date[25] = *t++; date[26] = '\0'; date[20] = ' '; } /* set internal date */ if (!mail_parse_date (elt,date)) { sprintf (tmp,"Unable to parse internal date: %s",(char *) date); MM_LOG (tmp,WARN); } } else { /* make date from file date */ struct tm *tm = gmtime (&sbuf.st_mtime); elt->day = tm->tm_mday; elt->month = tm->tm_mon + 1; elt->year = tm->tm_year + 1900 - BASEYEAR; elt->hours = tm->tm_hour; elt->minutes = tm->tm_min; elt->seconds = tm->tm_sec; elt->zhours = 0; elt->zminutes = 0; t = NIL; /* suppress line read */ } /* header starts here */ elt->private.msg.header.offset = elt->private.special.text.size; do { /* look for message body */ j = GETPOS (&bs); /* note position before line */ if (t) s = t = mmdf_mbxline (stream,&bs,&i); else t = s; /* this line read was suppressed */ if (ISMMDF (s)) { /* found terminator in header? */ SETPOS (&bs,j); /* oops, back up before line */ /* must insert a newline */ elt->private.spare.data++; break; /* punt */ } /* this line is part of header */ elt->private.msg.header.text.size += i; if (i) switch (*s) { /* check header lines */ case 'X': /* possible X-???: line */ if (s[1] == '-') { /* must be immediately followed by hyphen */ /* X-Status: becomes Status: in S case */ if (s[2] == 'S' && s[3] == 't' && s[4] == 'a' && s[5] == 't' && s[6] == 'u' && s[7] == 's' && s[8] == ':') s += 2; /* possible X-Keywords */ else if (s[2] == 'K' && s[3] == 'e' && s[4] == 'y' && s[5] == 'w' && s[6] == 'o' && s[7] == 'r' && s[8] == 'd' && s[9] == 's' && s[10] == ':') { SIZEDTEXT uf; retain = NIL; /* don't retain continuation */ s += 11; /* flush leading whitespace */ while (*s && (*s != '\n') && ((*s != '\r') || (s[1] != '\n'))){ while (*s == ' ') s++; /* find end of keyword */ if (!(u = strpbrk (s," \n\r"))) u = s + strlen (s); /* got a keyword? */ if ((k = (u - s)) && (k <= MAXUSERFLAG)) { uf.data = (unsigned char *) s; uf.size = k; for (j = 0; (j < NUSERFLAGS) && stream->user_flags[j]; ++j) if (!compare_csizedtext (stream->user_flags[j],&uf)) { elt->user_flags |= ((long) 1) << j; break; } } s = u; /* advance to next keyword */ } break; } /* possible X-IMAP */ else if ((s[2] == 'I') && (s[3] == 'M') && (s[4] == 'A') && (s[5] == 'P') && ((m = (s[6] == ':')) || ((s[6] == 'b') && (s[7] == 'a') && (s[8] == 's') && (s[9] == 'e') && (s[10] == ':')))) { retain = NIL; /* don't retain continuation */ if ((nmsgs == 1) && !stream->uid_validity) { /* advance to data */ s += m ? 7 : 11; /* flush whitespace */ while (*s == ' ') s++; j = 0; /* slurp UID validity */ /* found a digit? */ while (isdigit (*s)) { j *= 10; /* yes, add it in */ j += *s++ - '0'; } /* flush whitespace */ while (*s == ' ') s++; /* must have valid UID validity and UID last */ if (j && isdigit (*s)) { /* pseudo-header seen if X-IMAP */ if (m) pseudoseen = LOCAL->pseudo = T; /* save UID validity */ stream->uid_validity = j; j = 0; /* slurp UID last */ while (isdigit (*s)) { j *= 10; /* yes, add it in */ j += *s++ - '0'; } /* save UID last */ stream->uid_last = j; /* process keywords */ for (j = 0; (*s != '\n') && ((*s != '\r')||(s[1] != '\n')); s = u,j++) { /* flush leading whitespace */ while (*s == ' ') s++; u = strpbrk (s," \n\r"); /* got a keyword? */ if ((j < NUSERFLAGS) && (k = (u - s)) && (k <= MAXUSERFLAG)) { if (stream->user_flags[j]) fs_give ((void **) &stream->user_flags[j]); stream->user_flags[j] = (char *) fs_get (k + 1); strncpy (stream->user_flags[j],s,k); stream->user_flags[j][k] = '\0'; } } } } break; } /* possible X-UID */ else if (s[2] == 'U' && s[3] == 'I' && s[4] == 'D' && s[5] == ':') { retain = NIL; /* don't retain continuation */ /* only believe if have a UID validity */ if (stream->uid_validity && ((nmsgs > 1) || !pseudoseen)) { s += 6; /* advance to UID value */ /* flush whitespace */ while (*s == ' ') s++; j = 0; /* found a digit? */ while (isdigit (*s)) { j *= 10; /* yes, add it in */ j += *s++ - '0'; } /* flush remainder of line */ while (*s != '\n') s++; /* make sure not duplicated */ if (elt->private.uid) sprintf (tmp,"Message %lu UID %lu already has UID %lu", pseudoseen ? elt->msgno - 1 : elt->msgno, j,elt->private.uid); /* make sure UID doesn't go backwards */ else if (j <= prevuid) sprintf (tmp,"Message %lu UID %lu less than %lu", pseudoseen ? elt->msgno - 1 : elt->msgno, j,prevuid + 1); #if 0 /* this is currently broken by UIDPLUS */ /* or skip by mailbox's recorded last */ else if (j > stream->uid_last) sprintf (tmp,"Message %lu UID %lu greater than last %lu", pseudoseen ? elt->msgno - 1 : elt->msgno, j,stream->uid_last); #endif else { /* normal UID case */ prevuid = elt->private.uid = j; #if 1 /* temporary kludge for UIDPLUS */ if (prevuid > stream->uid_last) { stream->uid_last = prevuid; LOCAL->ddirty = LOCAL->dirty = T; } #endif break; /* exit this cruft */ } MM_LOG (tmp,WARN); /* invalidate UID validity */ stream->uid_validity = 0; elt->private.uid = 0; } break; } } /* otherwise fall into S case */ case 'S': /* possible Status: line */ if (s[0] == 'S' && s[1] == 't' && s[2] == 'a' && s[3] == 't' && s[4] == 'u' && s[5] == 's' && s[6] == ':') { retain = NIL; /* don't retain continuation */ s += 6; /* advance to status flags */ do switch (*s++) {/* parse flags */ case 'R': /* message read */ elt->seen = T; break; case 'O': /* message old */ if (elt->recent) { elt->recent = NIL; recent--; /* it really wasn't recent */ } break; case 'D': /* message deleted */ elt->deleted = T; break; case 'F': /* message flagged */ elt->flagged = T; break; case 'A': /* message answered */ elt->answered = T; break; case 'T': /* message is a draft */ elt->draft = T; break; default: /* some other crap */ break; } while (*s && (*s != '\n') && ((*s != '\r') || (s[1] != '\n'))); break; /* all done */ } /* otherwise fall into default case */ default: /* ordinary header line */ if ((*s == 'S') || (*s == 's') || (((*s == 'X') || (*s == 'x')) && (s[1] == '-'))) { unsigned char *e,*v; /* must match what mail_filter() does */ for (u = s,v = tmp,e = u + min (i,MAILTMPLEN - 1); (u < e) && ((c = (*u ? *u : (*u = ' '))) != ':') && ((c > ' ') || ((c != ' ') && (c != '\t') && (c != '\r') && (c != '\n'))); *v++ = *u++); *v = '\0'; /* tie off */ /* matches internal header? */ if (!compare_cstring (tmp,"STATUS") || !compare_cstring (tmp,"X-STATUS") || !compare_cstring (tmp,"X-KEYWORDS") || !compare_cstring (tmp,"X-UID") || !compare_cstring (tmp,"X-IMAP") || !compare_cstring (tmp,"X-IMAPBASE")) { char err[MAILTMPLEN]; sprintf (err,"Discarding bogus %s header in message %lu", (char *) tmp,elt->msgno); MM_LOG (err,WARN); retain = NIL; /* don't retain continuation */ break; /* different case or something */ } } /* retain or non-continuation? */ if (retain || ((*s != ' ') && (*s != '\t'))) { retain = T; /* retaining continuation now */ /* line length in LF format newline */ for (j = k = 0; j < i; ++j) if (s[j] != '\r') ++k; /* "internal" header size */ elt->private.spare.data += k; /* message size */ elt->rfc822_size += k + 1; } else { char err[MAILTMPLEN]; sprintf (err,"Discarding bogus continuation in msg %lu: %.80s", elt->msgno,(char *) s); if (u = strpbrk (err,"\r\n")) *u = '\0'; MM_LOG (err,WARN); break; /* different case or something */ } break; } } while (i && (*t != '\n') && ((*t != '\r') || (t[1] != '\n'))); /* "internal" header sans trailing newline */ if (i) elt->private.spare.data--; /* assign a UID if none found */ if (((nmsgs > 1) || !pseudoseen) && !elt->private.uid) { prevuid = elt->private.uid = ++stream->uid_last; elt->private.dirty = T; } else elt->private.dirty = elt->recent; /* note size of header, location of text */ elt->private.msg.header.text.size = (elt->private.msg.text.offset = (LOCAL->filesize + GETPOS (&bs)) - elt->private.special.offset) - elt->private.special.text.size; /* note current position */ j = LOCAL->filesize + GETPOS (&bs); if (i) do { /* look for next message */ s = mmdf_mbxline (stream,&bs,&i); if (i) { /* got new data? */ if (ISMMDF (s)) break; else { /* not a header line, add it to message */ elt->rfc822_size += i; for (j = 0; j < i; ++j) switch (s[j]) { case '\r': /* squeeze out CRs */ elt->rfc822_size -= 1; break; case '\n': /* LF becomes CRLF */ elt->rfc822_size += 1; break; default: break; } /* update current position */ j = LOCAL->filesize + GETPOS (&bs); } } } while (i); /* until found a header */ elt->private.msg.text.text.size = j - (elt->private.special.offset + elt->private.msg.text.offset); if (i) { /* get next header line */ /* remember first internal header position */ j = LOCAL->filesize + GETPOS (&bs); s = mmdf_mbxline (stream,&bs,&i); } /* until end of buffer */ } while (!stream->sniff && i); if (pseudoseen) { /* flush pseudo-message if present */ /* decrement recent count */ if (mail_elt (stream,1)->recent) recent--; /* and the exists count */ mail_exists (stream,nmsgs--); mail_expunged(stream,1);/* fake an expunge of that message */ } /* need to start a new UID validity? */ if (!stream->uid_validity) { stream->uid_validity = time (0); /* in case a whiner with no life */ if (mail_parameters (NIL,GET_USERHASNOLIFE,NIL)) stream->uid_nosticky = T; else if (nmsgs) { /* don't bother if empty file */ /* make dirty to restart UID epoch */ LOCAL->ddirty = LOCAL->dirty = T; /* need to rewrite msg 1 if not pseudo */ if (!LOCAL->pseudo) mail_elt (stream,1)->private.dirty = T; MM_LOG ("Assigning new unique identifiers to all messages",NIL); } } stream->nmsgs = oldnmsgs; /* whack it back down */ stream->silent = silent; /* restore old silent setting */ /* notify upper level of new mailbox sizes */ mail_exists (stream,nmsgs); mail_recent (stream,recent); /* mark dirty so O flags are set */ if (recent) LOCAL->dirty = T; } } /* no change, don't babble if never got time */ else if (LOCAL->filetime && LOCAL->filetime != sbuf.st_mtime) MM_LOG ("New mailbox modification time but apparently no changes",WARN); /* update parsed file size and time */ LOCAL->filesize = sbuf.st_size; LOCAL->filetime = sbuf.st_mtime; return T; /* return the winnage */ } /* MMDF read line from mailbox * Accepts: mail stream * stringstruct * pointer to line size * Returns: pointer to input line */ char *mmdf_mbxline (MAILSTREAM *stream,STRING *bs,unsigned long *size) { unsigned long i,j,k,m; char *s,*t,*te; char *ret = ""; /* flush old buffer */ if (LOCAL->line) fs_give ((void **) &LOCAL->line); /* if buffer needs refreshing */ if (!bs->cursize) SETPOS (bs,GETPOS (bs)); if (SIZE (bs)) { /* find newline */ /* end of fast scan */ te = (t = (s = bs->curpos) + bs->cursize) - 12; while (s < te) if ((*s++ == '\n') || (*s++ == '\n') || (*s++ == '\n') || (*s++ == '\n') || (*s++ == '\n') || (*s++ == '\n') || (*s++ == '\n') || (*s++ == '\n') || (*s++ == '\n') || (*s++ == '\n') || (*s++ == '\n') || (*s++ == '\n')) { --s; /* back up */ break; /* exit loop */ } /* final character-at-a-time scan */ while ((s < t) && (*s != '\n')) ++s; /* difficult case if line spans buffer */ if ((i = s - bs->curpos) == bs->cursize) { /* have space in line buffer? */ if (i > LOCAL->linebuflen) { fs_give ((void **) &LOCAL->linebuf); LOCAL->linebuf = (char *) fs_get (LOCAL->linebuflen = i); } /* remember what we have so far */ memcpy (LOCAL->linebuf,bs->curpos,i); /* load next buffer */ SETPOS (bs,k = GETPOS (bs) + i); /* end of fast scan */ te = (t = (s = bs->curpos) + bs->cursize) - 12; /* fast scan in overlap buffer */ while (s < te) if ((*s++ == '\n') || (*s++ == '\n') || (*s++ == '\n') || (*s++ == '\n') || (*s++ == '\n') || (*s++ == '\n') || (*s++ == '\n') || (*s++ == '\n') || (*s++ == '\n') || (*s++ == '\n') || (*s++ == '\n') || (*s++ == '\n')) { --s; /* back up */ break; /* exit loop */ } /* final character-at-a-time scan */ while ((s < t) && (*s != '\n')) ++s; /* huge line? */ if ((j = s - bs->curpos) == bs->cursize) { SETPOS (bs,GETPOS (bs) + j); /* look for end of line (s-l-o-w!!) */ for (m = SIZE (bs); m && (SNX (bs) != '\n'); --m,++j); SETPOS (bs,k); /* go back to where it started */ } /* got size of data, make buffer for return */ ret = LOCAL->line = (char *) fs_get (i + j + 2); /* copy first chunk */ memcpy (ret,LOCAL->linebuf,i); while (j) { /* copy remainder */ if (!bs->cursize) SETPOS (bs,GETPOS (bs)); memcpy (ret + i,bs->curpos,k = min (j,bs->cursize)); i += k; /* account for this much read in */ j -= k; bs->curpos += k; /* increment new position */ bs->cursize -= k; /* eat that many bytes */ } /* read newline at end */ if (SIZE (bs)) ret[i++] = SNX (bs); ret[i] = '\0'; /* makes debugging easier */ } else { /* this is easy */ ret = bs->curpos; /* string it at this position */ bs->curpos += ++i; /* increment new position */ bs->cursize -= i; /* eat that many bytes */ } *size = i; /* return that to user */ } else *size = 0; /* end of data, return empty */ /* embedded MMDF header at end of line? */ if ((*size > sizeof (MMDFHDRTXT)) && (s = ret + *size - (i = sizeof (MMDFHDRTXT) - 1)) && ISMMDF (s)) { SETPOS (bs,GETPOS (bs) - i);/* back up to start of MMDF header */ *size -= i; /* reduce length of line */ ret[*size - 1] = '\n'; /* force newline at end */ } return ret; } /* MMDF make pseudo-header * Accepts: MAIL stream * buffer to write pseudo-header * Returns: length of pseudo-header */ unsigned long mmdf_pseudo (MAILSTREAM *stream,char *hdr) { int i; char *s,tmp[MAILTMPLEN]; time_t now = time (0); rfc822_fixed_date (tmp); sprintf (hdr,"%sFrom %s %.24s\nDate: %s\nFrom: %s <%s@%.80s>\nSubject: %s\nMessage-ID: <%lu@%.80s>\nX-IMAP: %010lu %010lu", mmdfhdr,pseudo_from,ctime (&now), tmp,pseudo_name,pseudo_from,mylocalhost (),pseudo_subject, (unsigned long) now,mylocalhost (),stream->uid_validity, stream->uid_last); for (s = hdr + strlen (hdr),i = 0; i < NUSERFLAGS; ++i) if (stream->user_flags[i]) sprintf (s += strlen (s)," %s",stream->user_flags[i]); sprintf (s += strlen (s),"\nStatus: RO\n\n%s\n%s",pseudo_msg,mmdfhdr); return strlen (hdr); } /* MMDF make status string * Accepts: MAIL stream * destination string to write * message cache entry * UID to write if non-zero (else use elt->private.uid) * non-zero flag to write UID (.LT. 0 to write UID base info too) * Returns: length of string */ unsigned long mmdf_xstatus (MAILSTREAM *stream,char *status,MESSAGECACHE *elt, unsigned long uid,long flag) { char *t,stack[64]; char *s = status; unsigned long n; int pad = 50; int sticky = uid ? T : !stream->uid_nosticky; /* This used to use sprintf(), but thanks to certain cretinous C libraries with horribly slow implementations of sprintf() I had to change it to this mess. At least it should be fast. */ if ((flag < 0) && sticky) { /* need to write X-IMAPbase: header? */ *s++ = 'X'; *s++ = '-'; *s++ = 'I'; *s++ = 'M'; *s++ = 'A'; *s++ = 'P'; *s++ = 'b'; *s++ = 'a'; *s++ = 's'; *s++ = 'e'; *s++ = ':'; *s++ = ' '; t = stack; n = stream->uid_validity; /* push UID validity digits on the stack */ do *t++ = (char) (n % 10) + '0'; while (n /= 10); /* pop UID validity digits from stack */ while (t > stack) *s++ = *--t; *s++ = ' '; n = stream->uid_last; /* push UID last digits on the stack */ do *t++ = (char) (n % 10) + '0'; while (n /= 10); /* pop UID last digits from stack */ while (t > stack) *s++ = *--t; for (n = 0; n < NUSERFLAGS; ++n) if (t = stream->user_flags[n]) for (*s++ = ' '; *t; *s++ = *t++); *s++ = '\n'; pad += 30; /* increased padding if have IMAPbase */ } *s++ = 'S'; *s++ = 't'; *s++ = 'a'; *s++ = 't'; *s++ = 'u'; *s++ = 's'; *s++ = ':'; *s++ = ' '; if (elt->seen) *s++ = 'R'; /* only write O if have a UID */ if (flag && (!elt->recent || !LOCAL->appending)) *s++ = 'O'; *s++ = '\n'; *s++ = 'X'; *s++ = '-'; *s++ = 'S'; *s++ = 't'; *s++ = 'a'; *s++ = 't'; *s++ = 'u'; *s++ = 's'; *s++ = ':'; *s++ = ' '; if (elt->deleted) *s++ = 'D'; if (elt->flagged) *s++ = 'F'; if (elt->answered) *s++ = 'A'; if (elt->draft) *s++ = 'T'; *s++ = '\n'; if (sticky) { /* only do this if UIDs sticky */ *s++ = 'X'; *s++ = '-'; *s++ = 'K'; *s++ = 'e'; *s++ = 'y'; *s++ = 'w'; *s++ = 'o'; *s++ = 'r'; *s++ = 'd'; *s++ = 's'; *s++ = ':'; if (n = elt->user_flags) do { *s++ = ' '; for (t = stream->user_flags[find_rightmost_bit (&n)]; *t; *s++ = *t++); } while (n); n = s - status; /* get size of stuff so far */ /* pad X-Keywords to make size constant */ if (n < pad) for (n = pad - n; n > 0; --n) *s++ = ' '; *s++ = '\n'; if (flag) { /* want to include UID? */ t = stack; /* push UID digits on the stack */ n = uid ? uid : elt->private.uid; do *t++ = (char) (n % 10) + '0'; while (n /= 10); *s++ = 'X'; *s++ = '-'; *s++ = 'U'; *s++ = 'I'; *s++ = 'D'; *s++ = ':'; *s++ = ' '; /* pop UID from stack */ while (t > stack) *s++ = *--t; *s++ = '\n'; } } *s++ = '\n'; *s = '\0'; /* end of extended message status */ return s - status; /* return size of resulting string */ } /* Rewrite mailbox file * Accepts: MAIL stream, must be critical and locked * return pointer to number of expunged messages if want expunge * lock file name * expunge sequence, not deleted flag * Returns: T if success and mailbox unlocked, NIL if failure */ #define OVERFLOWBUFLEN 8192 /* initial overflow buffer length */ long mmdf_rewrite (MAILSTREAM *stream,unsigned long *nexp,DOTLOCK *lock, long flags) { MESSAGECACHE *elt; MMDFFILE f; char *s; time_t tp[2]; long ret,flag; unsigned long i,j; unsigned long recent = stream->recent; unsigned long size = LOCAL->pseudo ? mmdf_pseudo (stream,LOCAL->buf) : 0; if (nexp) *nexp = 0; /* initially nothing expunged */ /* calculate size of mailbox after rewrite */ for (i = 1,flag = LOCAL->pseudo ? 1 : -1; i <= stream->nmsgs; i++) { elt = mail_elt (stream,i); /* get cache */ if (!(nexp && elt->deleted && (flags ? elt->sequence : T))) { /* add RFC822 size of this message */ size += elt->private.special.text.size + elt->private.spare.data + mmdf_xstatus (stream,LOCAL->buf,elt,NIL,flag) + elt->private.msg.text.text.size + MMDFHDRLEN; flag = 1; /* only count X-IMAPbase once */ } } /* no messages, has a life, and no pseudo */ if (!size && !mail_parameters (NIL,GET_USERHASNOLIFE,NIL)) { LOCAL->pseudo = T; /* so make a pseudo-message now */ size = mmdf_pseudo (stream,LOCAL->buf); } /* extend the file as necessary */ if (ret = mmdf_extend (stream,size)) { /* Set up buffered I/O file structure * curpos current position being written through buffering * filepos current position being written physically to the disk * bufpos current position being written in the buffer * protect current maximum position that can be written to the disk * before buffering is forced * The code tries to buffer so that that disk is written in multiples of * OVERBLOWBUFLEN bytes. */ f.stream = stream; /* note mail stream */ f.curpos = f.filepos = 0; /* start of file */ f.protect = stream->nmsgs ? /* initial protection pointer */ mail_elt (stream,1)->private.special.offset : 8192; f.bufpos = f.buf = (char *) fs_get (f.buflen = OVERFLOWBUFLEN); if (LOCAL->pseudo) /* update pseudo-header */ mmdf_write (&f,LOCAL->buf,mmdf_pseudo (stream,LOCAL->buf)); /* loop through all messages */ for (i = 1,flag = LOCAL->pseudo ? 1 : -1; i <= stream->nmsgs;) { elt = mail_elt (stream,i);/* get cache */ /* expunge this message? */ if (nexp && elt->deleted && (flags ? elt->sequence : T)) { /* one less recent message */ if (elt->recent) --recent; mail_expunged(stream,i);/* notify upper levels */ ++*nexp; /* count up one more expunged message */ } else { /* preserve this message */ i++; /* advance to next message */ if ((flag < 0) || /* need to rewrite message? */ elt->private.dirty || (f.curpos != elt->private.special.offset) || (elt->private.msg.header.text.size != (elt->private.spare.data + mmdf_xstatus (stream,LOCAL->buf,elt,NIL,flag)))) { unsigned long newoffset = f.curpos; /* yes, seek to internal header */ lseek (LOCAL->fd,elt->private.special.offset,L_SET); read (LOCAL->fd,LOCAL->buf,elt->private.special.text.size); /* see if need to squeeze out a CR */ if (LOCAL->buf[elt->private.special.text.size - 2] == '\r') { LOCAL->buf[--elt->private.special.text.size - 1] = '\n'; --size; /* squeezed out a CR from PC */ } /* protection pointer moves to RFC822 header */ f.protect = elt->private.special.offset + elt->private.msg.header.offset; /* write internal header */ mmdf_write (&f,LOCAL->buf,elt->private.special.text.size); /* get RFC822 header */ s = mmdf_header (stream,elt->msgno,&j,FT_INTERNAL); /* in case this got decremented */ elt->private.msg.header.offset = elt->private.special.text.size; /* header size, sans trailing newline */ if ((j < 2) || (s[j - 2] == '\n')) j--; /* this can happen if CRs were squeezed */ if (j < elt->private.spare.data) { /* so fix up counts */ size -= elt->private.spare.data - j; elt->private.spare.data = j; } else if (j != elt->private.spare.data) fatal ("header size inconsistent"); /* protection pointer moves to RFC822 text */ f.protect = elt->private.special.offset + elt->private.msg.text.offset; mmdf_write (&f,s,j); /* write RFC822 header */ /* write status and UID */ mmdf_write (&f,LOCAL->buf, j = mmdf_xstatus (stream,LOCAL->buf,elt,NIL,flag)); flag = 1; /* only write X-IMAPbase once */ /* new file header size */ elt->private.msg.header.text.size = elt->private.spare.data + j; /* did text move? */ if (f.curpos != f.protect) { /* get message text */ s = mmdf_text_work (stream,elt,&j,FT_INTERNAL); /* this can happen if CRs were squeezed */ if (j < elt->private.msg.text.text.size) { /* so fix up counts */ size -= elt->private.msg.text.text.size - j; elt->private.msg.text.text.size = j; } /* can't happen it says here */ else if (j > elt->private.msg.text.text.size) fatal ("text size inconsistent"); /* new text offset, status/UID may change it */ elt->private.msg.text.offset = f.curpos - newoffset; /* protection pointer moves to next message */ f.protect = (i <= stream->nmsgs) ? mail_elt (stream,i)->private.special.offset : (f.curpos + j + MMDFHDRLEN); mmdf_write (&f,s,j);/* write text */ /* write trailing newline */ mmdf_write (&f,mmdfhdr,MMDFHDRLEN); } else { /* tie off header and status */ mmdf_write (&f,NIL,NIL); f.curpos = f.protect =/* restart everything at end of message */ f.filepos += elt->private.msg.text.text.size + MMDFHDRLEN; } /* new internal header offset */ elt->private.special.offset = newoffset; elt->private.dirty =NIL;/* message is now clean */ } else { /* no need to rewrite this message */ /* tie off previous message if needed */ mmdf_write (&f,NIL,NIL); f.curpos = f.protect =/* restart everything at end of message */ f.filepos += elt->private.special.text.size + elt->private.msg.header.text.size + elt->private.msg.text.text.size + MMDFHDRLEN; } } } mmdf_write (&f,NIL,NIL); /* tie off final message */ if (size != f.filepos) fatal ("file size inconsistent"); fs_give ((void **) &f.buf); /* free buffer */ /* make sure tied off */ ftruncate (LOCAL->fd,LOCAL->filesize = size); fsync (LOCAL->fd); /* make sure the updates take */ if (size && (flag < 0)) fatal ("lost UID base information"); /* no longer dirty */ LOCAL->ddirty = LOCAL->dirty = NIL; /* notify upper level of new mailbox sizes */ mail_exists (stream,stream->nmsgs); mail_recent (stream,recent); /* set atime to now, mtime a second earlier */ tp[1] = (tp[0] = time (0)) - 1; /* set the times, note change */ if (!utime (stream->mailbox,tp)) LOCAL->filetime = tp[1]; close (LOCAL->fd); /* close and reopen file */ if ((LOCAL->fd = open (stream->mailbox,O_RDWR, (long) mail_parameters (NIL,GET_MBXPROTECTION,NIL))) < 0) { sprintf (LOCAL->buf,"Mailbox open failed, aborted: %s",strerror (errno)); MM_LOG (LOCAL->buf,ERROR); mmdf_abort (stream); } dotlock_unlock (lock); /* flush the lock file */ } return ret; /* return state from algorithm */ } /* Extend MMDF mailbox file * Accepts: MAIL stream * new desired size * Return: T if success, else NIL */ long mmdf_extend (MAILSTREAM *stream,unsigned long size) { unsigned long i = (size > LOCAL->filesize) ? size - LOCAL->filesize : 0; if (i) { /* does the mailbox need to grow? */ if (i > LOCAL->buflen) { /* make sure have enough space */ /* this user won the lottery all right */ fs_give ((void **) &LOCAL->buf); LOCAL->buf = (char *) fs_get ((LOCAL->buflen = i) + 1); } memset (LOCAL->buf,'\0',i); /* get a block of nulls */ while (T) { /* until write successful or punt */ lseek (LOCAL->fd,LOCAL->filesize,L_SET); if ((write (LOCAL->fd,LOCAL->buf,i) >= 0) && !fsync (LOCAL->fd)) break; else { long e = errno; /* note error before doing ftruncate */ ftruncate (LOCAL->fd,LOCAL->filesize); if (MM_DISKERROR (stream,e,NIL)) { fsync (LOCAL->fd); /* user chose to punt */ sprintf (LOCAL->buf,"Unable to extend mailbox: %s",strerror (e)); if (!stream->silent) MM_LOG (LOCAL->buf,ERROR); return NIL; } } } } return LONGT; } /* Write data to buffered file * Accepts: buffered file pointer * file data or NIL to indicate "flush buffer" * date size (ignored for "flush buffer") * Does not return until success */ void mmdf_write (MMDFFILE *f,char *buf,unsigned long size) { unsigned long i,j,k; if (buf) { /* doing buffered write? */ i = f->bufpos - f->buf; /* yes, get size of current buffer data */ /* yes, have space in current buffer chunk? */ if (j = i ? ((f->buflen - i) % OVERFLOWBUFLEN) : f->buflen) { /* yes, fill up buffer as much as we can */ memcpy (f->bufpos,buf,k = min (j,size)); f->bufpos += k; /* new buffer position */ f->curpos += k; /* new current position */ if (j -= k) return; /* all done if still have buffer free space */ buf += k; /* full, get new unwritten data pointer */ size -= k; /* new data size */ i += k; /* new buffer data size */ } /* This chunk of the buffer is full. See if can make some space by * writing to the disk, if there's enough unprotected space to do so. * Try to fill out any unaligned chunk, along with any subsequent full * chunks that will fit in unprotected space. */ /* any unprotected space we can write to? */ if (j = min (i,f->protect - f->filepos)) { /* yes, filepos not at chunk boundary? */ if ((k = f->filepos % OVERFLOWBUFLEN) && ((k = OVERFLOWBUFLEN - k) < j)) j -= k; /* yes, and can write out partial chunk */ else k = 0; /* no partial chunk to write */ /* if at least a chunk free, write that too */ if (j > OVERFLOWBUFLEN) k += j - (j % OVERFLOWBUFLEN); if (k) { /* write data if there is anything we can */ mmdf_phys_write (f,f->buf,k); /* slide buffer */ if (i -= k) memmove (f->buf,f->buf + k,i); f->bufpos = f->buf + i; /* new end of buffer */ } } /* Have flushed the buffer as best as possible. All done if no more * data to write. Otherwise, if the buffer is empty AND if the unwritten * data is larger than a chunk AND the unprotected space is also larger * than a chunk, then write as many chunks as we can directly from the * data. Buffer the rest, expanding the buffer as needed. */ if (size) { /* have more data that we need to buffer? */ /* can write any of it to disk instead? */ if ((f->bufpos == f->buf) && ((j = min (f->protect - f->filepos,size)) > OVERFLOWBUFLEN)) { /* write as much as we can right now */ mmdf_phys_write (f,buf,j -= (j % OVERFLOWBUFLEN)); buf += j; /* new data pointer */ size -= j; /* new data size */ f->curpos += j; /* advance current pointer */ } if (size) { /* still have data that we need to buffer? */ /* yes, need to expand the buffer? */ if ((i = ((f->bufpos + size) - f->buf)) > f->buflen) { /* note current position in buffer */ j = f->bufpos - f->buf; i += OVERFLOWBUFLEN; /* yes, grow another chunk */ fs_resize ((void **) &f->buf,f->buflen = i - (i % OVERFLOWBUFLEN)); /* in case buffer relocated */ f->bufpos = f->buf + j; } /* buffer remaining data */ memcpy (f->bufpos,buf,size); f->bufpos += size; /* new end of buffer */ f->curpos += size; /* advance current pointer */ } } } else { /* flush buffer to disk */ mmdf_phys_write (f,f->buf,i = f->bufpos - f->buf); f->bufpos = f->buf; /* reset buffer */ /* update positions */ f->curpos = f->protect = f->filepos; } } /* Physical disk write * Accepts: buffered file pointer * buffer address * buffer size * Does not return until success */ void mmdf_phys_write (MMDFFILE *f,char *buf,size_t size) { MAILSTREAM *stream = f->stream; /* write data at desired position */ while (size && ((lseek (LOCAL->fd,f->filepos,L_SET) < 0) || (write (LOCAL->fd,buf,size) < 0))) { int e; char tmp[MAILTMPLEN]; sprintf (tmp,"Unable to write to mailbox: %s",strerror (e = errno)); MM_LOG (tmp,ERROR); MM_DISKERROR (NIL,e,T); /* serious problem, must retry */ } f->filepos += size; /* update file position */ }