pop3.c
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上传日期:2007-01-04
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- /*
- * Program: Post Office Protocol 3 (POP3) client 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: 6 June 1994
- * Last Edited: 28 October 1999
- *
- * Copyright 1999 by the University of Washington
- *
- * Permission to use, copy, modify, and distribute this software and its
- * documentation for any purpose and without fee is hereby granted, provided
- * that the above copyright notices appear in all copies and that both the
- * above copyright notices and this permission notice appear in supporting
- * documentation, and that the name of the University of Washington not be
- * used in advertising or publicity pertaining to distribution of the software
- * without specific, written prior permission. This software is made
- * available "as is", and
- * THE UNIVERSITY OF WASHINGTON DISCLAIMS ALL WARRANTIES, EXPRESS OR IMPLIED,
- * WITH REGARD TO THIS SOFTWARE, INCLUDING WITHOUT LIMITATION ALL IMPLIED
- * WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE, AND IN
- * NO EVENT SHALL THE UNIVERSITY OF WASHINGTON BE LIABLE FOR ANY SPECIAL,
- * INDIRECT OR CONSEQUENTIAL DAMAGES OR ANY DAMAGES WHATSOEVER RESULTING
- * FROM LOSS OF USE, DATA OR PROFITS, WHETHER IN AN ACTION OF CONTRACT, TORT
- * (INCLUDING NEGLIGENCE) OR STRICT LIABILITY, ARISING OUT OF OR IN
- * CONNECTION WITH THE USE OR PERFORMANCE OF THIS SOFTWARE.
- *
- */
- #include "mail.h"
- #include "osdep.h"
- #include <ctype.h>
- #include <stdio.h>
- #include <time.h>
- #include "pop3.h"
- #include "rfc822.h"
- #include "misc.h"
- #include "netmsg.h"
- #include "flstring.h"
- /* POP3 mail routines */
- /* Driver dispatch used by MAIL */
- DRIVER pop3driver = {
- "pop3", /* driver name */
- /* driver flags */
- #ifdef INADEQUATE_MEMORY
- DR_LOWMEM |
- #endif
- DR_MAIL|DR_NOFAST|DR_CRLF|DR_NOSTICKY,
- (DRIVER *) NIL, /* next driver */
- pop3_valid, /* mailbox is valid for us */
- pop3_parameters, /* manipulate parameters */
- pop3_scan, /* scan mailboxes */
- pop3_list, /* find mailboxes */
- pop3_lsub, /* find subscribed mailboxes */
- pop3_subscribe, /* subscribe to mailbox */
- pop3_unsubscribe, /* unsubscribe from mailbox */
- pop3_create, /* create mailbox */
- pop3_delete, /* delete mailbox */
- pop3_rename, /* rename mailbox */
- pop3_status, /* status of mailbox */
- pop3_open, /* open mailbox */
- pop3_close, /* close mailbox */
- pop3_fetchfast, /* fetch message "fast" attributes */
- NIL, /* fetch message flags */
- NIL, /* fetch overview */
- NIL, /* fetch message structure */
- pop3_header, /* fetch message header */
- pop3_text, /* fetch message text */
- NIL, /* fetch message */
- NIL, /* unique identifier */
- NIL, /* message number from UID */
- NIL, /* modify flags */
- NIL, /* per-message modify flags */
- NIL, /* search for message based on criteria */
- NIL, /* sort messages */
- NIL, /* thread messages */
- pop3_ping, /* ping mailbox to see if still alive */
- pop3_check, /* check for new messages */
- pop3_expunge, /* expunge deleted messages */
- pop3_copy, /* copy messages to another mailbox */
- pop3_append, /* append string message to mailbox */
- NIL /* garbage collect stream */
- };
- /* prototype stream */
- MAILSTREAM pop3proto = {&pop3driver};
- /* driver parameters */
- static unsigned long pop3_maxlogintrials = MAXLOGINTRIALS;
- static long pop3_port = 0;
- static long pop3_altport = 0;
- static char *pop3_altname = NIL;
- /* POP3 mail validate mailbox
- * Accepts: mailbox name
- * Returns: our driver if name is valid, NIL otherwise
- */
- DRIVER *pop3_valid (char *name)
- {
- DRIVER *drv;
- char mbx[MAILTMPLEN];
- return ((drv = mail_valid_net (name,&pop3driver,NIL,mbx)) &&
- !strcmp (ucase (mbx),"INBOX")) ? drv : NIL;
- }
- /* News manipulate driver parameters
- * Accepts: function code
- * function-dependent value
- * Returns: function-dependent return value
- */
- void *pop3_parameters (long function,void *value)
- {
- switch ((int) function) {
- case SET_MAXLOGINTRIALS:
- pop3_maxlogintrials = (unsigned long) value;
- break;
- case GET_MAXLOGINTRIALS:
- value = (void *) pop3_maxlogintrials;
- break;
- case SET_POP3PORT:
- pop3_port = (long) value;
- break;
- case GET_POP3PORT:
- value = (void *) pop3_port;
- break;
- case SET_ALTPOPPORT:
- pop3_altport = (long) value;
- break;
- case GET_ALTPOPPORT:
- value = (void *) pop3_altport;
- break;
- case SET_ALTPOPNAME:
- pop3_altname = (char *) value;
- break;
- case GET_ALTPOPNAME:
- value = (void *) pop3_altname;
- break;
- default:
- value = NIL; /* error case */
- break;
- }
- return value;
- }
- /* POP3 mail scan mailboxes for string
- * Accepts: mail stream
- * reference
- * pattern to search
- * string to scan
- */
- void pop3_scan (MAILSTREAM *stream,char *ref,char *pat,char *contents)
- {
- char tmp[MAILTMPLEN];
- if ((ref && *ref) ? /* have a reference */
- (pop3_valid (ref) && pmatch ("INBOX",pat)) :
- (mail_valid_net (pat,&pop3driver,NIL,tmp) && pmatch ("INBOX",tmp)))
- mm_log ("Scan not valid for POP3 mailboxes",ERROR);
- }
- /* POP3 mail find list of all mailboxes
- * Accepts: mail stream
- * reference
- * pattern to search
- */
- void pop3_list (MAILSTREAM *stream,char *ref,char *pat)
- {
- char tmp[MAILTMPLEN];
- if (ref && *ref) { /* have a reference */
- if (pop3_valid (ref) && pmatch ("INBOX",pat)) {
- strcpy (strchr (strcpy (tmp,ref),'}')+1,"INBOX");
- mm_list (stream,NIL,tmp,LATT_NOINFERIORS);
- }
- }
- else if (mail_valid_net (pat,&pop3driver,NIL,tmp) && pmatch ("INBOX",tmp)) {
- strcpy (strchr (strcpy (tmp,pat),'}')+1,"INBOX");
- mm_list (stream,NIL,tmp,LATT_NOINFERIORS);
- }
- }
- /* POP3 mail find list of subscribed mailboxes
- * Accepts: mail stream
- * reference
- * pattern to search
- */
- void pop3_lsub (MAILSTREAM *stream,char *ref,char *pat)
- {
- void *sdb = NIL;
- char *s,mbx[MAILTMPLEN];
- if (*pat == '{') { /* if remote pattern, must be POP3 */
- if (!pop3_valid (pat)) return;
- ref = NIL; /* good POP3 pattern, punt reference */
- }
- /* if remote reference, must be valid POP3 */
- if (ref && (*ref == '{') && !pop3_valid (ref)) return;
- /* kludgy application of reference */
- if (ref && *ref) sprintf (mbx,"%s%s",ref,pat);
- else strcpy (mbx,pat);
- if (s = sm_read (&sdb)) do if (pop3_valid (s) && pmatch (s,mbx))
- mm_lsub (stream,NIL,s,NIL);
- while (s = sm_read (&sdb)); /* until no more subscriptions */
- }
- /* POP3 mail subscribe to mailbox
- * Accepts: mail stream
- * mailbox to add to subscription list
- * Returns: T on success, NIL on failure
- */
- long pop3_subscribe (MAILSTREAM *stream,char *mailbox)
- {
- return sm_subscribe (mailbox);
- }
- /* POP3 mail unsubscribe to mailbox
- * Accepts: mail stream
- * mailbox to delete from subscription list
- * Returns: T on success, NIL on failure
- */
- long pop3_unsubscribe (MAILSTREAM *stream,char *mailbox)
- {
- return sm_unsubscribe (mailbox);
- }
- /* POP3 mail create mailbox
- * Accepts: mail stream
- * mailbox name to create
- * Returns: T on success, NIL on failure
- */
- long pop3_create (MAILSTREAM *stream,char *mailbox)
- {
- return NIL; /* never valid for POP3 */
- }
- /* POP3 mail delete mailbox
- * mailbox name to delete
- * Returns: T on success, NIL on failure
- */
- long pop3_delete (MAILSTREAM *stream,char *mailbox)
- {
- return NIL; /* never valid for POP3 */
- }
- /* POP3 mail rename mailbox
- * Accepts: mail stream
- * old mailbox name
- * new mailbox name
- * Returns: T on success, NIL on failure
- */
- long pop3_rename (MAILSTREAM *stream,char *old,char *newname)
- {
- return NIL; /* never valid for POP3 */
- }
- /* POP3 status
- * Accepts: mail stream
- * mailbox name
- * status flags
- * Returns: T on success, NIL on failure
- */
- long pop3_status (MAILSTREAM *stream,char *mbx,long flags)
- {
- MAILSTATUS status;
- unsigned long i;
- long ret = NIL;
- MAILSTREAM *tstream =
- (stream && LOCAL->netstream && mail_usable_network_stream (stream,mbx)) ?
- stream : mail_open (NIL,mbx,OP_SILENT);
- if (tstream) { /* have a usable stream? */
- status.flags = flags; /* return status values */
- status.messages = tstream->nmsgs;
- status.recent = tstream->recent;
- if (flags & SA_UNSEEN) /* must search to get unseen messages */
- for (i = 1,status.unseen = 0; i < tstream->nmsgs; i++)
- if (!mail_elt (tstream,i)->seen) status.unseen++;
- status.uidnext = tstream->uid_last + 1;
- status.uidvalidity = tstream->uid_validity;
- /* pass status to main program */
- mm_status (tstream,mbx,&status);
- if (stream != tstream) mail_close (tstream);
- ret = LONGT;
- }
- return ret; /* success */
- }
- /* POP3 mail open
- * Accepts: stream to open
- * Returns: stream on success, NIL on failure
- */
- MAILSTREAM *pop3_open (MAILSTREAM *stream)
- {
- unsigned long i;
- char tmp[MAILTMPLEN],usr[MAILTMPLEN];
- NETMBX mb;
- MESSAGECACHE *elt;
- /* return prototype for OP_PROTOTYPE call */
- if (!stream) return &pop3proto;
- mail_valid_net_parse (stream->mailbox,&mb);
- if (stream->local) fatal ("pop3 recycle stream");
- /* /anonymous not supported */
- if (mb.anoflag || stream->anonymous) {
- mm_log ("Anonymous POP3 login not available",ERROR);
- return NIL;
- }
- /* copy other switches */
- if (mb.dbgflag) stream->debug = T;
- if (mb.secflag) stream->secure = T;
- mb.tryaltflag = stream->tryalt;
- stream->local = fs_get (sizeof (POP3LOCAL));
- stream->sequence++; /* bump sequence number */
- stream->perm_deleted = T; /* deleted is only valid flag */
- LOCAL->response = LOCAL->reply = NIL;
- /* currently no message */
- LOCAL->msgno = LOCAL->hdrsize = 0;
- LOCAL->txt = NIL; /* no file initially */
- if ((LOCAL->netstream = /* try to open connection */
- net_open (&mb,NIL,pop3_port ? pop3_port : POP3TCPPORT,
- (NETDRIVER *) mail_parameters (NIL,GET_ALTDRIVER,NIL),
- (char *) mail_parameters (NIL,GET_ALTPOPNAME,NIL),
- (unsigned long) mail_parameters (NIL,GET_ALTPOPPORT,NIL))) &&
- pop3_reply (stream)) {
- mm_log (LOCAL->reply,NIL); /* give greeting */
- if (!pop3_auth (stream,&mb,tmp,usr)) pop3_close (stream,NIL);
- else if (pop3_send (stream,"STAT",NIL)) {
- int silent = stream->silent;
- stream->silent = T;
- sprintf (tmp,"{%s:%lu/pop3",net_host (LOCAL->netstream),
- net_port (LOCAL->netstream));
- if (mb.altflag) sprintf (tmp + strlen (tmp),"/%s",(char *)
- mail_parameters (NIL,GET_ALTDRIVERNAME,NIL));
- if (mb.secflag) strcat (tmp,"/secure");
- sprintf (tmp + strlen (tmp),"/user="%s"}INBOX",usr);
- stream->inbox = T; /* always INBOX */
- fs_give ((void **) &stream->mailbox);
- stream->mailbox = cpystr (tmp);
- /* notify upper level */
- mail_exists (stream,stream->uid_last = strtoul (LOCAL->reply,NIL,10));
- mail_recent (stream,stream->nmsgs);
- /* instantiate elt */
- for (i = 0; i < stream->nmsgs;) {
- elt = mail_elt (stream,++i);
- elt->valid = elt->recent = T;
- elt->private.uid = i;
- }
- stream->silent = silent; /* notify main program */
- mail_exists (stream,stream->nmsgs);
- /* notify if empty */
- if (!(stream->nmsgs || stream->silent)) mm_log ("Mailbox is empty",WARN);
- }
- else { /* error in STAT */
- mm_log (LOCAL->reply,ERROR);
- pop3_close (stream,NIL); /* too bad */
- }
- }
- else { /* connection failed */
- if (LOCAL->reply) mm_log (LOCAL->reply,ERROR);
- pop3_close (stream,NIL); /* failed, clean up */
- }
- return LOCAL ? stream : NIL; /* if stream is alive, return to caller */
- }
- /* POP3 authenticate
- * Accepts: stream to login
- * parsed network mailbox structure
- * scratch buffer
- * place to return user name
- * Returns: T on success, NIL on failure
- */
- long pop3_auth (MAILSTREAM *stream,NETMBX *mb,char *tmp,char *usr)
- {
- unsigned long i,auths = 0;
- char *t;
- AUTHENTICATOR *at;
- /* get list of authenticators */
- if (pop3_send (stream,"AUTH",NIL)) {
- while ((t = net_getline (LOCAL->netstream)) && (t[1] || (*t != '.'))) {
- if (stream->debug) mm_dlog (t);
- if ((i = mail_lookup_auth_name (t,stream->secure)) &&
- (--i < (8*sizeof (unsigned long)))) auths |= (1 << i);
- fs_give ((void **) &t);
- }
- if (t) { /* flush end of text indicator */
- if (stream->debug) mm_dlog (t);
- fs_give ((void **) &t);
- }
- }
- if (auths) { /* got any authenticators? */
- for (t = NIL; LOCAL->netstream && auths &&
- (at = mail_lookup_auth (find_rightmost_bit (&auths)+1)); ) {
- if (t) { /* previous authenticator failed? */
- sprintf (tmp,"Retrying using %.80s authentication after %.80s",
- at->name,t);
- mm_log (tmp,NIL);
- fs_give ((void **) &t);
- }
- for (i = 1,tmp[0] = ''; /* until run out of trials */
- LOCAL->netstream && i && (i <= pop3_maxlogintrials); ) {
- if (tmp[0]) mm_log (tmp,WARN);
- if (pop3_send (stream,"AUTH",at->name) &&
- (*at->client) (pop3_challenge,pop3_response,mb,stream,&i,usr) &&
- LOCAL->response && (*LOCAL->response == '+')) return LONGT;
- t = cpystr (LOCAL->reply);
- sprintf (tmp,"Retrying %s authentication after %s",at->name,t);
- }
- }
- if (t) { /* previous authenticator failed? */
- sprintf (tmp,"Can not authenticate to POP3 server: %.80s",t);
- mm_log (tmp,ERROR);
- fs_give ((void **) &t);
- }
- }
- else if (stream->secure)
- mm_log ("Can't do secure authentication with this server",ERROR);
- else { /* traditional login */
- for (i = 0; LOCAL->netstream && (i < pop3_maxlogintrials); ++i) {
- tmp[0] = ''; /* prompt user for password */
- mm_login (mb,usr,tmp,i);
- if (tmp[0]) { /* send login sequence */
- if (pop3_send (stream,"USER",usr) && pop3_send (stream,"PASS",tmp))
- return LONGT; /* success */
- mm_log (LOCAL->reply,WARN);
- }
- else { /* user refused to give a password */
- mm_log ("Login aborted",ERROR);
- return NIL;
- }
- }
- mm_log ("Too many login failures",ERROR);
- }
- return NIL; /* ran out of authenticators */
- }
- /* Get challenge to authenticator in binary
- * Accepts: stream
- * pointer to returned size
- * Returns: challenge or NIL if not challenge
- */
- void *pop3_challenge (void *s,unsigned long *len)
- {
- MAILSTREAM *stream = (MAILSTREAM *) s;
- return ((*LOCAL->response == '+') && (LOCAL->response[1] == ' ')) ?
- rfc822_base64 ((unsigned char *) LOCAL->reply,strlen (LOCAL->reply),len) :
- NIL;
- }
- /* Send authenticator response in BASE64
- * Accepts: MAIL stream
- * string to send
- * length of string
- * Returns: T if successful, else NIL
- */
- long pop3_response (void *s,char *response,unsigned long size)
- {
- MAILSTREAM *stream = (MAILSTREAM *) s;
- unsigned long i,j,ret;
- char *t,*u;
- if (response) { /* make CRLFless BASE64 string */
- if (size) {
- for (t = (char *) rfc822_binary ((void *) response,size,&i),u = t,j = 0;
- j < i; j++) if (t[j] > ' ') *u++ = t[j];
- *u = ''; /* tie off string for mm_dlog() */
- if (stream->debug) mm_dlog (t);
- /* append CRLF */
- *u++ = '15'; *u++ = '12'; *u = '';
- ret = net_sout (LOCAL->netstream,t,u - t);
- fs_give ((void **) &t);
- }
- else ret = net_sout (LOCAL->netstream,"1512",2);
- }
- /* abort requested */
- else ret = net_sout (LOCAL->netstream,"*1512",3);
- pop3_reply (stream); /* set up response */
- return ret;
- }
- /* POP3 mail close
- * Accepts: MAIL stream
- * option flags
- */
- void pop3_close (MAILSTREAM *stream,long options)
- {
- int silent = stream->silent;
- if (LOCAL) { /* only if a file is open */
- if (LOCAL->netstream) { /* close POP3 connection */
- stream->silent = T;
- if (options & CL_EXPUNGE) pop3_expunge (stream);
- stream->silent = silent;
- pop3_send (stream,"QUIT",NIL);
- mm_notify (stream,LOCAL->reply,BYE);
- }
- /* close POP3 connection */
- if (LOCAL->netstream) net_close (LOCAL->netstream);
- if (LOCAL->txt) fclose (LOCAL->txt);
- LOCAL->txt = NIL;
- if (LOCAL->response) fs_give ((void **) &LOCAL->response);
- /* nuke the local data */
- fs_give ((void **) &stream->local);
- stream->dtb = NIL; /* log out the DTB */
- }
- }
- /* POP3 mail fetch fast information
- * Accepts: MAIL stream
- * sequence
- * option flags
- * This is ugly and slow
- */
- void pop3_fetchfast (MAILSTREAM *stream,char *sequence,long flags)
- {
- unsigned long i;
- MESSAGECACHE *elt;
- /* get sequence */
- 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)) {
- ENVELOPE **env = NIL;
- ENVELOPE *e = NIL;
- if (!stream->scache) env = &elt->private.msg.env;
- else if (stream->msgno == i) env = &stream->env;
- else env = &e;
- if (!*env || !elt->rfc822_size) {
- STRING bs;
- unsigned long hs;
- char *ht = (*stream->dtb->header) (stream,i,&hs,NIL);
- /* need to make an envelope? */
- if (!*env) rfc822_parse_msg (env,NIL,ht,hs,NIL,BADHOST,
- stream->dtb->flags);
- /* need message size too, ugh */
- if (!elt->rfc822_size) {
- (*stream->dtb->text) (stream,i,&bs,FT_PEEK);
- elt->rfc822_size = hs + SIZE (&bs) - GETPOS (&bs);
- }
- }
- /* if need date, have date in envelope? */
- if (!elt->day && *env && (*env)->date)
- mail_parse_date (elt,(*env)->date);
- /* sigh, fill in bogus default */
- if (!elt->day) mail_parse_date (elt,"01-JAN-1969 00:00:00 +0000");
- mail_free_envelope (&e);
- }
- }
- /* POP3 fetch header as text
- * Accepts: mail stream
- * message number
- * pointer to return size
- * flags
- * Returns: header text
- */
- char *pop3_header (MAILSTREAM *stream,unsigned long msgno,unsigned long *size,
- long flags)
- {
- MESSAGECACHE *elt;
- if ((flags & FT_UID) && !(msgno = mail_msgno (stream,msgno))) return NIL;
- /* have header text? */
- if (!(elt = mail_elt (stream,msgno))->private.msg.header.text.data) {
- elt->private.msg.header.text.size = pop3_cache (stream,elt);
- /* read the header */
- fread (elt->private.msg.header.text.data = (unsigned char *)
- fs_get ((size_t) elt->private.msg.header.text.size + 1),
- (size_t) 1,(size_t) elt->private.msg.header.text.size,LOCAL->txt);
- elt->private.msg.header.text.data[elt->private.msg.header.text.size] ='';
- }
- /* return size of text */
- if (size) *size = elt->private.msg.header.text.size;
- return (char *) elt->private.msg.header.text.data;
- }
- /* POP3 fetch body
- * Accepts: mail stream
- * message number
- * pointer to stringstruct to initialize
- * flags
- * Returns: T if successful, else NIL
- */
- long pop3_text (MAILSTREAM *stream,unsigned long msgno,STRING *bs,long flags)
- {
- MESSAGECACHE *elt;
- INIT (bs,mail_string,(void *) "",0);
- if ((flags & FT_UID) && !(msgno = mail_msgno (stream,msgno))) return NIL;
- elt = mail_elt (stream,msgno);
- pop3_cache (stream,elt); /* make sure cache loaded */
- if (!LOCAL->txt) return NIL; /* error if don't have a file */
- if (!(flags & FT_PEEK)) { /* mark seen if needed */
- elt->seen = T;
- mm_flags (stream,elt->msgno);
- }
- INIT (bs,file_string,(void *) LOCAL->txt,elt->rfc822_size);
- SETPOS (bs,LOCAL->hdrsize); /* skip past header */
- return T;
- }
- /* POP3 cache message
- * Accepts: mail stream
- * message number
- * Returns: header size
- */
- unsigned long pop3_cache (MAILSTREAM *stream,MESSAGECACHE *elt)
- {
- /* already cached? */
- if (LOCAL->msgno != elt->msgno) {
- /* no, close current file */
- if (LOCAL->txt) fclose (LOCAL->txt);
- LOCAL->txt = NIL;
- LOCAL->msgno = LOCAL->hdrsize = 0;
- if (pop3_send_num (stream,"RETR",elt->msgno)) {
- LOCAL->msgno = elt->msgno;/* set as current message number */
- /* load the cache */
- LOCAL->txt = netmsg_slurp (LOCAL->netstream,&elt->rfc822_size,
- &LOCAL->hdrsize);
- }
- else elt->deleted = T;
- }
- return LOCAL->hdrsize;
- }
- /* POP3 mail ping mailbox
- * Accepts: MAIL stream
- * Returns: T if stream alive, else NIL
- */
- long pop3_ping (MAILSTREAM *stream)
- {
- return pop3_send (stream,"NOOP",NIL);
- }
- /* POP3 mail check mailbox
- * Accepts: MAIL stream
- */
- void pop3_check (MAILSTREAM *stream)
- {
- if (pop3_ping (stream)) mm_log ("Check completed",NIL);
- }
- /* POP3 mail expunge mailbox
- * Accepts: MAIL stream
- */
- void pop3_expunge (MAILSTREAM *stream)
- {
- char tmp[MAILTMPLEN];
- unsigned long i = 1,n = 0;
- while (i <= stream->nmsgs) {
- if (mail_elt (stream,i)->deleted && pop3_send_num (stream,"DELE",i)) {
- mail_expunged (stream,i);
- n++;
- }
- else i++; /* try next message */
- }
- if (!stream->silent) { /* only if not silent */
- if (n) { /* did we expunge anything? */
- sprintf (tmp,"Expunged %lu messages",n);
- mm_log (tmp,(long) NIL);
- }
- else mm_log ("No messages deleted, so no update needed",(long) NIL);
- }
- }
- /* POP3 mail copy message(s)
- * Accepts: MAIL stream
- * sequence
- * destination mailbox
- * option flags
- * Returns: T if copy successful, else NIL
- */
- long pop3_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 POP3",ERROR);
- return NIL;
- }
- /* POP3 mail append message from stringstruct
- * Accepts: MAIL stream
- * destination mailbox
- * stringstruct of messages to append
- * Returns: T if append successful, else NIL
- */
- long pop3_append (MAILSTREAM *stream,char *mailbox,char *flags,char *date,
- STRING *message)
- {
- mm_log ("Append not valid for POP3",ERROR);
- return NIL;
- }
- /* Internal routines */
- /* Post Office Protocol 3 send command with number argument
- * Accepts: MAIL stream
- * command
- * number
- * Returns: T if successful, NIL if failure
- */
- long pop3_send_num (MAILSTREAM *stream,char *command,unsigned long n)
- {
- char tmp[MAILTMPLEN];
- sprintf (tmp,"%lu",mail_uid (stream,n));
- return pop3_send (stream,command,tmp);
- }
- /* Post Office Protocol 3 send command
- * Accepts: MAIL stream
- * command
- * command argument
- * Returns: T if successful, NIL if failure
- */
- long pop3_send (MAILSTREAM *stream,char *command,char *args)
- {
- char tmp[8*MAILTMPLEN];
- long ret;
- mail_lock (stream); /* lock up the stream */
- if (!LOCAL->netstream) ret = pop3_fake (stream,"No-op dead stream");
- else { /* build the complete command */
- if (args) sprintf (tmp,"%s %s",command,args);
- else strcpy (tmp,command);
- if (stream->debug) mm_dlog (tmp);
- strcat (tmp,"1512");
- /* send the command */
- ret = net_soutr (LOCAL->netstream,tmp) ? pop3_reply (stream) :
- pop3_fake (stream,"POP3 connection broken in command");
- }
- mail_unlock (stream); /* unlock stream */
- return ret;
- }
- /* Post Office Protocol 3 get reply
- * Accepts: MAIL stream
- * Returns: T if success reply, NIL if error reply
- */
- long pop3_reply (MAILSTREAM *stream)
- {
- char *s;
- /* flush old reply */
- if (LOCAL->response) fs_give ((void **) &LOCAL->response);
- /* get reply */
- if (!(LOCAL->response = net_getline (LOCAL->netstream)))
- return pop3_fake (stream,"POP3 connection broken in response");
- if (stream->debug) mm_dlog (LOCAL->response);
- LOCAL->reply = (s = strchr (LOCAL->response,' ')) ? s + 1 : LOCAL->response;
- /* return success or failure */
- return (*LOCAL->response =='+') ? T : NIL;
- }
- /* Post Office Protocol 3 set fake error
- * Accepts: MAIL stream
- * error text
- * Returns: NIL, always
- */
- long pop3_fake (MAILSTREAM *stream,char *text)
- {
- mm_notify (stream,text,BYE); /* send bye alert */
- if (LOCAL->netstream) net_close (LOCAL->netstream);
- LOCAL->netstream = NIL; /* farewell, dear TCP stream */
- /* flush any old reply */
- if (LOCAL->response) fs_give ((void **) &LOCAL->response);
- LOCAL->reply = text; /* set up pseudo-reply string */
- return NIL; /* return error code */
- }