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/* ========================================================================
* Copyright 1988-2007 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: News routines
*
* Author: Mark Crispin
* Networks and Distributed Computing
* Computing & Communications
* University of Washington
* Administration Building, AG-44
* Seattle, WA 98195
* Internet: MRC@CAC.Washington.EDU
*
* Date: 4 September 1991
* Last Edited: 30 January 2007
*/
#include <stdio.h>
#include <ctype.h>
#include <errno.h>
extern int errno; /* just in case */
#include "mail.h"
#include "osdep.h"
#include <sys/stat.h>
#include <sys/time.h>
#include "misc.h"
#include "newsrc.h"
#include "fdstring.h"
/* news_load_message() flags */
#define NLM_HEADER 0x1 /* load message text */
#define NLM_TEXT 0x2 /* load message text */
/* NEWS I/O stream local data */
typedef struct news_local {
unsigned int dirty : 1; /* disk copy of .newsrc needs updating */
char *dir; /* spool directory name */
char *name; /* local mailbox name */
unsigned char buf[CHUNKSIZE]; /* scratch buffer */
unsigned long cachedtexts; /* total size of all cached texts */
} NEWSLOCAL;
/* Convenient access to local data */
#define LOCAL ((NEWSLOCAL *) stream->local)
/* Function prototypes */
DRIVER *news_valid (char *name);
DRIVER *news_isvalid (char *name,char *mbx);
void *news_parameters (long function,void *value);
void news_scan (MAILSTREAM *stream,char *ref,char *pat,char *contents);
void news_list (MAILSTREAM *stream,char *ref,char *pat);
void news_lsub (MAILSTREAM *stream,char *ref,char *pat);
long news_canonicalize (char *ref,char *pat,char *pattern);
long news_subscribe (MAILSTREAM *stream,char *mailbox);
long news_unsubscribe (MAILSTREAM *stream,char *mailbox);
long news_create (MAILSTREAM *stream,char *mailbox);
long news_delete (MAILSTREAM *stream,char *mailbox);
long news_rename (MAILSTREAM *stream,char *old,char *newname);
MAILSTREAM *news_open (MAILSTREAM *stream);
int news_select (struct direct *name);
int news_numsort (const void *d1,const void *d2);
void news_close (MAILSTREAM *stream,long options);
void news_fast (MAILSTREAM *stream,char *sequence,long flags);
void news_flags (MAILSTREAM *stream,char *sequence,long flags);
void news_load_message (MAILSTREAM *stream,unsigned long msgno,long flags);
char *news_header (MAILSTREAM *stream,unsigned long msgno,
unsigned long *length,long flags);
long news_text (MAILSTREAM *stream,unsigned long msgno,STRING *bs,long flags);
void news_flagmsg (MAILSTREAM *stream,MESSAGECACHE *elt);
long news_ping (MAILSTREAM *stream);
void news_check (MAILSTREAM *stream);
long news_expunge (MAILSTREAM *stream,char *sequence,long options);
long news_copy (MAILSTREAM *stream,char *sequence,char *mailbox,long options);
long news_append (MAILSTREAM *stream,char *mailbox,append_t af,void *data);
/* News routines */
/* Driver dispatch used by MAIL */
DRIVER newsdriver = {
"news", /* driver name */
/* driver flags */
DR_NEWS|DR_READONLY|DR_NOFAST|DR_NAMESPACE|DR_NONEWMAIL|DR_DIRFMT,
(DRIVER *) NIL, /* next driver */
news_valid, /* mailbox is valid for us */
news_parameters, /* manipulate parameters */
news_scan, /* scan mailboxes */
news_list, /* find mailboxes */
news_lsub, /* find subscribed mailboxes */
news_subscribe, /* subscribe to mailbox */
news_unsubscribe, /* unsubscribe from mailbox */
news_create, /* create mailbox */
news_delete, /* delete mailbox */
news_rename, /* rename mailbox */
mail_status_default, /* status of mailbox */
news_open, /* open mailbox */
news_close, /* close mailbox */
news_fast, /* fetch message "fast" attributes */
news_flags, /* fetch message flags */
NIL, /* fetch overview */
NIL, /* fetch message envelopes */
news_header, /* fetch message header */
news_text, /* fetch message body */
NIL, /* fetch partial message text */
NIL, /* unique identifier */
NIL, /* message number */
NIL, /* modify flags */
news_flagmsg, /* per-message modify flags */
NIL, /* search for message based on criteria */
NIL, /* sort messages */
NIL, /* thread messages */
news_ping, /* ping mailbox to see if still alive */
news_check, /* check for new messages */
news_expunge, /* expunge deleted messages */
news_copy, /* copy messages to another mailbox */
news_append, /* append string message to mailbox */
NIL /* garbage collect stream */
};
/* prototype stream */
MAILSTREAM newsproto = {&newsdriver};
/* News validate mailbox
* Accepts: mailbox name
* Returns: our driver if name is valid, NIL otherwise
*/
DRIVER *news_valid (char *name)
{
int fd;
char *s,*t,*u;
struct stat sbuf;
if ((name[0] == '#') && (name[1] == 'n') && (name[2] == 'e') &&
(name[3] == 'w') && (name[4] == 's') && (name[5] == '.') &&
!strchr (name,'/') &&
!stat ((char *) mail_parameters (NIL,GET_NEWSSPOOL,NIL),&sbuf) &&
((fd = open ((char *) mail_parameters (NIL,GET_NEWSACTIVE,NIL),O_RDONLY,
NIL)) >= 0)) {
fstat (fd,&sbuf); /* get size of active file */
/* slurp in active file */
read (fd,t = s = (char *) fs_get (sbuf.st_size+1),sbuf.st_size);
s[sbuf.st_size] = '\0'; /* tie off file */
close (fd); /* flush file */
while (*t && (u = strchr (t,' '))) {
*u++ = '\0'; /* tie off at end of name */
if (!strcmp (name+6,t)) {
fs_give ((void **) &s); /* flush data */
return &newsdriver;
}
t = 1 + strchr (u,'\n'); /* next line */
}
fs_give ((void **) &s); /* flush data */
}
return NIL; /* return status */
}
/* News manipulate driver parameters
* Accepts: function code
* function-dependent value
* Returns: function-dependent return value
*/
void *news_parameters (long function,void *value)
{
return (function == GET_NEWSRC) ? env_parameters (function,value) : NIL;
}
/* News scan mailboxes
* Accepts: mail stream
* reference
* pattern to search
* string to scan
*/
void news_scan (MAILSTREAM *stream,char *ref,char *pat,char *contents)
{
char tmp[MAILTMPLEN];
if (news_canonicalize (ref,pat,tmp))
mm_log ("Scan not valid for news mailboxes",ERROR);
}
/* News find list of newsgroups
* Accepts: mail stream
* reference
* pattern to search
*/
void news_list (MAILSTREAM *stream,char *ref,char *pat)
{
int fd;
int i;
char *s,*t,*u,*r,pattern[MAILTMPLEN],name[MAILTMPLEN];
struct stat sbuf;
if (!pat || !*pat) { /* empty pattern? */
if (news_canonicalize (ref,"*",pattern)) {
/* tie off name at root */
if (s = strchr (pattern,'.')) *++s = '\0';
else pattern[0] = '\0';
mm_list (stream,'.',pattern,LATT_NOSELECT);
}
}
else if (news_canonicalize (ref,pat,pattern) &&
!stat ((char *) mail_parameters (NIL,GET_NEWSSPOOL,NIL),&sbuf) &&
((fd = open ((char *) mail_parameters (NIL,GET_NEWSACTIVE,NIL),
O_RDONLY,NIL)) >= 0)) {
fstat (fd,&sbuf); /* get file size and read data */
read (fd,s = (char *) fs_get (sbuf.st_size + 1),sbuf.st_size);
close (fd); /* close file */
s[sbuf.st_size] = '\0'; /* tie off string */
strcpy (name,"#news."); /* write initial prefix */
i = strlen (pattern); /* length of pattern */
if (pattern[--i] != '%') i = 0;
if (t = strtok_r (s,"\n",&r)) do if (u = strchr (t,' ')) {
*u = '\0'; /* tie off at end of name */
strcpy (name + 6,t); /* make full form of name */
if (pmatch_full (name,pattern,'.')) mm_list (stream,'.',name,NIL);
else if (i && (u = strchr (name + i,'.'))) {
*u = '\0'; /* tie off at delimiter, see if matches */
if (pmatch_full (name,pattern,'.'))
mm_list (stream,'.',name,LATT_NOSELECT);
}
} while (t = strtok_r (NIL,"\n",&r));
fs_give ((void **) &s);
}
}
/* News find list of subscribed newsgroups
* Accepts: mail stream
* reference
* pattern to search
*/
void news_lsub (MAILSTREAM *stream,char *ref,char *pat)
{
char pattern[MAILTMPLEN];
/* return data from newsrc */
if (news_canonicalize (ref,pat,pattern)) newsrc_lsub (stream,pattern);
}
/* News canonicalize newsgroup name
* Accepts: reference
* pattern
* returned single pattern
* Returns: T on success, NIL on failure
*/
long news_canonicalize (char *ref,char *pat,char *pattern)
{
unsigned long i;
char *s;
if (ref && *ref) { /* have a reference */
strcpy (pattern,ref); /* copy reference to pattern */
/* # overrides mailbox field in reference */
if (*pat == '#') strcpy (pattern,pat);
/* pattern starts, reference ends, with . */
else if ((*pat == '.') && (pattern[strlen (pattern) - 1] == '.'))
strcat (pattern,pat + 1); /* append, omitting one of the period */
else strcat (pattern,pat); /* anything else is just appended */
}
else strcpy (pattern,pat); /* just have basic name */
if ((pattern[0] == '#') && (pattern[1] == 'n') && (pattern[2] == 'e') &&
(pattern[3] == 'w') && (pattern[4] == 's') && (pattern[5] == '.') &&
!strchr (pattern,'/')) { /* count wildcards */
for (i = 0, s = pattern; *s; *s++) if ((*s == '*') || (*s == '%')) ++i;
/* success if not too many */
if (i <= MAXWILDCARDS) return LONGT;
MM_LOG ("Excessive wildcards in LIST/LSUB",ERROR);
}
return NIL;
}
/* News subscribe to mailbox
* Accepts: mail stream
* mailbox to add to subscription list
* Returns: T on success, NIL on failure
*/
long news_subscribe (MAILSTREAM *stream,char *mailbox)
{
return news_valid (mailbox) ? newsrc_update (stream,mailbox+6,':') : NIL;
}
/* NEWS unsubscribe to mailbox
* Accepts: mail stream
* mailbox to delete from subscription list
* Returns: T on success, NIL on failure
*/
long news_unsubscribe (MAILSTREAM *stream,char *mailbox)
{
return news_valid (mailbox) ? newsrc_update (stream,mailbox+6,'!') : NIL;
}
/* News create mailbox
* Accepts: mail stream
* mailbox name to create
* Returns: T on success, NIL on failure
*/
long news_create (MAILSTREAM *stream,char *mailbox)
{
return NIL; /* never valid for News */
}
/* News delete mailbox
* mailbox name to delete
* Returns: T on success, NIL on failure
*/
long news_delete (MAILSTREAM *stream,char *mailbox)
{
return NIL; /* never valid for News */
}
/* News rename mailbox
* Accepts: mail stream
* old mailbox name
* new mailbox name
* Returns: T on success, NIL on failure
*/
long news_rename (MAILSTREAM *stream,char *old,char *newname)
{
return NIL; /* never valid for News */
}
/* News open
* Accepts: stream to open
* Returns: stream on success, NIL on failure
*/
MAILSTREAM *news_open (MAILSTREAM *stream)
{
long i,nmsgs;
char *s,tmp[MAILTMPLEN];
struct direct **names = NIL;
/* return prototype for OP_PROTOTYPE call */
if (!stream) return &newsproto;
if (stream->local) fatal ("news recycle stream");
/* build directory name */
sprintf (s = tmp,"%s/%s",(char *) mail_parameters (NIL,GET_NEWSSPOOL,NIL),
stream->mailbox + 6);
while (s = strchr (s,'.')) *s = '/';
/* scan directory */
if ((nmsgs = scandir (tmp,&names,news_select,news_numsort)) >= 0) {
mail_exists (stream,nmsgs); /* notify upper level that messages exist */
stream->local = fs_get (sizeof (NEWSLOCAL));
LOCAL->dirty = NIL; /* no update to .newsrc needed yet */
LOCAL->dir = cpystr (tmp); /* copy directory name for later */
LOCAL->name = cpystr (stream->mailbox + 6);
for (i = 0; i < nmsgs; ++i) {
stream->uid_last = mail_elt (stream,i+1)->private.uid =
atoi (names[i]->d_name);
fs_give ((void **) &names[i]);
}
s = (void *) names; /* stupid language */
fs_give ((void **) &s); /* free directory */
LOCAL->cachedtexts = 0; /* no cached texts */
stream->sequence++; /* bump sequence number */
stream->rdonly = stream->perm_deleted = T;
/* UIDs are always valid */
stream->uid_validity = 0xbeefface;
/* read .newsrc entries */
mail_recent (stream,newsrc_read (LOCAL->name,stream));
/* notify if empty newsgroup */
if (!(stream->nmsgs || stream->silent)) {
sprintf (tmp,"Newsgroup %s is empty",LOCAL->name);
mm_log (tmp,WARN);
}
}
else mm_log ("Unable to scan newsgroup spool directory",ERROR);
return LOCAL ? stream : NIL; /* if stream is alive, return to caller */
}
/* News file name selection test
* Accepts: candidate directory entry
* Returns: T to use file name, NIL to skip it
*/
int news_select (struct direct *name)
{
char c;
char *s = name->d_name;
while (c = *s++) if (!isdigit (c)) return NIL;
return T;
}
/* News file name comparision
* Accepts: first candidate directory entry
* second candidate directory entry
* Returns: negative if d1 < d2, 0 if d1 == d2, postive if d1 > d2
*/
int news_numsort (const void *d1,const void *d2)
{
return atoi ((*(struct direct **) d1)->d_name) -
atoi ((*(struct direct **) d2)->d_name);
}
/* News close
* Accepts: MAIL stream
* option flags
*/
void news_close (MAILSTREAM *stream,long options)
{
if (LOCAL) { /* only if a file is open */
news_check (stream); /* dump final checkpoint */
if (LOCAL->dir) fs_give ((void **) &LOCAL->dir);
if (LOCAL->name) fs_give ((void **) &LOCAL->name);
/* nuke the local data */
fs_give ((void **) &stream->local);
stream->dtb = NIL; /* log out the DTB */
}
}
/* News fetch fast information
* Accepts: MAIL stream
* sequence
* option flags
*/
void news_fast (MAILSTREAM *stream,char *sequence,long flags)
{
MESSAGECACHE *elt;
unsigned long i;
/* set up metadata for all messages */
if (stream && LOCAL && ((flags & FT_UID) ?
mail_uid_sequence (stream,sequence) :
mail_sequence (stream,sequence)))
for (i = 1; i <= stream->nmsgs; i++)
if ((elt = mail_elt (stream,i))->sequence &&
!(elt->day && elt->rfc822_size)) news_load_message (stream,i,NIL);
}
/* News fetch flags
* Accepts: MAIL stream
* sequence
* option flags
*/
void news_flags (MAILSTREAM *stream,char *sequence,long flags)
{
unsigned long i;
if ((flags & FT_UID) ? /* validate all elts */
mail_uid_sequence (stream,sequence) : mail_sequence (stream,sequence))
for (i = 1; i <= stream->nmsgs; i++) mail_elt (stream,i)->valid = T;
}
/* News load message into cache
* Accepts: MAIL stream
* message #
* option flags
*/
void news_load_message (MAILSTREAM *stream,unsigned long msgno,long flags)
{
unsigned long i,j,nlseen;
int fd;
unsigned char c,*t;
struct stat sbuf;
MESSAGECACHE *elt;
FDDATA d;
STRING bs;
elt = mail_elt (stream,msgno);/* get elt */
/* build message file name */
sprintf (LOCAL->buf,"%s/%lu",LOCAL->dir,elt->private.uid);
/* anything we need not currently cached? */
if ((!elt->day || !elt->rfc822_size ||
((flags & NLM_HEADER) && !elt->private.msg.header.text.data) ||
((flags & NLM_TEXT) && !elt->private.msg.text.text.data)) &&
((fd = open (LOCAL->buf,O_RDONLY,NIL)) >= 0)) {
fstat (fd,&sbuf); /* get file metadata */
d.fd = fd; /* set up file descriptor */
d.pos = 0; /* start of file */
d.chunk = LOCAL->buf;
d.chunksize = CHUNKSIZE;
INIT (&bs,fd_string,&d,sbuf.st_size);
if (!elt->day) { /* set internaldate to 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;
}
if (!elt->rfc822_size) { /* know message size yet? */
for (i = 0, j = SIZE (&bs), nlseen = 0; j--; ) switch (SNX (&bs)) {
case '\015': /* unlikely carriage return */
if (!j || (CHR (&bs) != '\012')) {
i++; /* ugh, raw CR */
nlseen = NIL;
break;
}
SNX (&bs); /* eat the line feed, drop in */
case '\012': /* line feed? */
i += 2; /* count a CRLF */
/* header size known yet? */
if (!elt->private.msg.header.text.size && nlseen) {
/* note position in file */
elt->private.special.text.size = GETPOS (&bs);
/* and CRLF-adjusted size */
elt->private.msg.header.text.size = i;
}
nlseen = T; /* note newline seen */
break;
default: /* ordinary chararacter */
i++;
nlseen = NIL;
break;
}
SETPOS (&bs,0); /* restore old position */
elt->rfc822_size = i; /* note that we have size now */
/* header is entire message if no delimiter */
if (!elt->private.msg.header.text.size)
elt->private.msg.header.text.size = elt->rfc822_size;
/* text is remainder of message */
elt->private.msg.text.text.size =
elt->rfc822_size - elt->private.msg.header.text.size;
}
/* need to load cache with message data? */
if (((flags & NLM_HEADER) && !elt->private.msg.header.text.data) ||
((flags & NLM_TEXT) && !elt->private.msg.text.text.data)) {
/* purge cache if too big */
if (LOCAL->cachedtexts > max (stream->nmsgs * 4096,2097152)) {
/* just can't keep that much */
mail_gc (stream,GC_TEXTS);
LOCAL->cachedtexts = 0;
}
if ((flags & NLM_HEADER) && !elt->private.msg.header.text.data) {
t = elt->private.msg.header.text.data =
(unsigned char *) fs_get (elt->private.msg.header.text.size + 1);
LOCAL->cachedtexts += elt->private.msg.header.text.size;
/* read in message header */
for (i = 0; i <= elt->private.msg.header.text.size; i++)
switch (c = SNX (&bs)) {
case '\015': /* unlikely carriage return */
*t++ = c;
if ((CHR (&bs) == '\012')) *t++ = SNX (&bs);
break;
case '\012': /* line feed? */
*t++ = '\015';
default:
*t++ = c;
break;
}
*t = '\0'; /* tie off string */
}
if ((flags & NLM_TEXT) && !elt->private.msg.text.text.data) {
t = elt->private.msg.text.text.data =
(unsigned char *) fs_get (elt->private.msg.text.text.size + 1);
SETPOS (&bs,elt->private.msg.header.text.size);
LOCAL->cachedtexts += elt->private.msg.text.text.size;
/* read in message text */
for (i = 0; i <= elt->private.msg.text.text.size; i++)
switch (c = SNX (&bs)) {
case '\015': /* unlikely carriage return */
*t++ = c;
if ((CHR (&bs) == '\012')) *t++ = SNX (&bs);
break;
case '\012': /* line feed? */
*t++ = '\015';
default:
*t++ = c;
break;
}
*t = '\0'; /* tie off string */
}
}
close (fd); /* flush message file */
}
}
/* News fetch message header
* Accepts: MAIL stream
* message # to fetch
* pointer to returned header text length
* option flags
* Returns: message header in RFC822 format
*/
char *news_header (MAILSTREAM *stream,unsigned long msgno,
unsigned long *length,long flags)
{
MESSAGECACHE *elt;
*length = 0; /* default to empty */
if (flags & FT_UID) return "";/* UID call "impossible" */
elt = mail_elt (stream,msgno);/* get elt */
if (!elt->private.msg.header.text.data)
news_load_message (stream,msgno,NLM_HEADER);
*length = elt->private.msg.header.text.size;
return (char *) elt->private.msg.header.text.data;
}
/* News fetch message text (body only)
* Accepts: MAIL stream
* message # to fetch
* pointer to returned stringstruct
* option flags
* Returns: T on success, NIL on failure
*/
long news_text (MAILSTREAM *stream,unsigned long msgno,STRING *bs,long flags)
{
MESSAGECACHE *elt;
/* UID call "impossible" */
if (flags & FT_UID) return NIL;
elt = mail_elt (stream,msgno);/* get elt */
/* snarf message if don't have it yet */
if (!elt->private.msg.text.text.data) {
news_load_message (stream,msgno,NLM_TEXT);
if (!elt->private.msg.text.text.data) return NIL;
}
if (!(flags & FT_PEEK)) { /* mark as seen */
mail_elt (stream,msgno)->seen = T;
mm_flags (stream,msgno);
}
INIT (bs,mail_string,elt->private.msg.text.text.data,
elt->private.msg.text.text.size);
return T;
}
/* News per-message modify flag
* Accepts: MAIL stream
* message cache element
*/
void news_flagmsg (MAILSTREAM *stream,MESSAGECACHE *elt)
{
if (!LOCAL->dirty) { /* only bother checking if not dirty yet */
if (elt->valid) { /* if done, see if deleted changed */
if (elt->sequence != elt->deleted) LOCAL->dirty = T;
elt->sequence = T; /* leave the sequence set */
}
/* note current setting of deleted flag */
else elt->sequence = elt->deleted;
}
}
/* News ping mailbox
* Accepts: MAIL stream
* Returns: T if stream alive, else NIL
*/
long news_ping (MAILSTREAM *stream)
{
return T; /* always alive */
}
/* News check mailbox
* Accepts: MAIL stream
*/
void news_check (MAILSTREAM *stream)
{
/* never do if no updates */
if (LOCAL->dirty) newsrc_write (LOCAL->name,stream);
LOCAL->dirty = NIL;
}
/* News expunge mailbox
* Accepts: MAIL stream
* sequence to expunge if non-NIL
* expunge options
* Returns: T if success, NIL if failure
*/
long news_expunge (MAILSTREAM *stream,char *sequence,long options)
{
if (!stream->silent) mm_log ("Expunge ignored on readonly mailbox",NIL);
return LONGT;
}
/* News copy message(s)
* Accepts: MAIL stream
* sequence
* destination mailbox
* option flags
* Returns: T if copy successful, else NIL
*/
long news_copy (MAILSTREAM *stream,char *sequence,char *mailbox,long options)
{
mailproxycopy_t pc =
(mailproxycopy_t) mail_parameters (stream,GET_MAILPROXYCOPY,NIL);
if (pc) return (*pc) (stream,sequence,mailbox,options);
mm_log ("Copy not valid for News",ERROR);
return NIL;
}
/* News append message from stringstruct
* Accepts: MAIL stream
* destination mailbox
* append callback function
* data for callback
* Returns: T if append successful, else NIL
*/
long news_append (MAILSTREAM *stream,char *mailbox,append_t af,void *data)
{
mm_log ("Append not valid for news",ERROR);
return NIL;
}
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