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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: 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: 4 April 2007
*/
#include <ctype.h>
#include <stdio.h>
#include <time.h>
#include "c-client.h"
#include "flstring.h"
#include "netmsg.h"
/* Parameters */
#define POP3TCPPORT (long) 110 /* assigned TCP contact port */
#define POP3SSLPORT (long) 995 /* assigned SSL TCP contact port */
#define IDLETIMEOUT (long) 10 /* defined in RFC 1939 */
/* POP3 I/O stream local data */
typedef struct pop3_local {
NETSTREAM *netstream; /* TCP I/O stream */
char *response; /* last server reply */
char *reply; /* text of last server reply */
unsigned long cached; /* current cached message uid */
unsigned long hdrsize; /* current cached header size */
FILE *txt; /* current cached file descriptor */
struct {
unsigned int capa : 1; /* server has CAPA, definitely new */
unsigned int expire : 1; /* server has EXPIRE */
unsigned int logindelay : 1;/* server has LOGIN-DELAY */
unsigned int stls : 1; /* server has STLS */
unsigned int pipelining : 1;/* server has PIPELINING */
unsigned int respcodes : 1; /* server has RESP-CODES */
unsigned int top : 1; /* server has TOP */
unsigned int uidl : 1; /* server has UIDL */
unsigned int user : 1; /* server has USER */
char *implementation; /* server implementation string */
long delaysecs; /* minimum time between login (neg variable) */
long expiredays; /* server-guaranteed minimum retention days */
/* supported authenticators */
unsigned int sasl : MAXAUTHENTICATORS;
} cap;
unsigned int sensitive : 1; /* sensitive data in progress */
unsigned int loser : 1; /* server is a loser */
unsigned int saslcancel : 1; /* SASL cancelled by protocol */
} POP3LOCAL;
/* Convenient access to local data */
#define LOCAL ((POP3LOCAL *) stream->local)
/* Function prototypes */
DRIVER *pop3_valid (char *name);
void *pop3_parameters (long function,void *value);
void pop3_scan (MAILSTREAM *stream,char *ref,char *pat,char *contents);
void pop3_list (MAILSTREAM *stream,char *ref,char *pat);
void pop3_lsub (MAILSTREAM *stream,char *ref,char *pat);
long pop3_subscribe (MAILSTREAM *stream,char *mailbox);
long pop3_unsubscribe (MAILSTREAM *stream,char *mailbox);
long pop3_create (MAILSTREAM *stream,char *mailbox);
long pop3_delete (MAILSTREAM *stream,char *mailbox);
long pop3_rename (MAILSTREAM *stream,char *old,char *newname);
long pop3_status (MAILSTREAM *stream,char *mbx,long flags);
MAILSTREAM *pop3_open (MAILSTREAM *stream);
long pop3_capa (MAILSTREAM *stream,long flags);
long pop3_auth (MAILSTREAM *stream,NETMBX *mb,char *pwd,char *usr);
void *pop3_challenge (void *stream,unsigned long *len);
long pop3_response (void *stream,char *s,unsigned long size);
void pop3_close (MAILSTREAM *stream,long options);
void pop3_fetchfast (MAILSTREAM *stream,char *sequence,long flags);
char *pop3_header (MAILSTREAM *stream,unsigned long msgno,unsigned long *size,
long flags);
long pop3_text (MAILSTREAM *stream,unsigned long msgno,STRING *bs,long flags);
unsigned long pop3_cache (MAILSTREAM *stream,MESSAGECACHE *elt);
long pop3_ping (MAILSTREAM *stream);
void pop3_check (MAILSTREAM *stream);
long pop3_expunge (MAILSTREAM *stream,char *sequence,long options);
long pop3_copy (MAILSTREAM *stream,char *sequence,char *mailbox,long options);
long pop3_append (MAILSTREAM *stream,char *mailbox,append_t af,void *data);
long pop3_send_num (MAILSTREAM *stream,char *command,unsigned long n);
long pop3_send (MAILSTREAM *stream,char *command,char *args);
long pop3_reply (MAILSTREAM *stream);
long pop3_fake (MAILSTREAM *stream,char *text);
/* 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|DR_NOINTDATE|DR_NONEWMAIL,
(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_sslport = 0;
/* POP3 mail validate mailbox
* Accepts: mailbox name
* Returns: our driver if name is valid, NIL otherwise
*/
DRIVER *pop3_valid (char *name)
{
NETMBX mb;
return (mail_valid_net_parse (name,&mb) &&
!strcmp (mb.service,pop3driver.name) && !mb.authuser[0] &&
!compare_cstring (mb.mailbox,"INBOX")) ? &pop3driver : 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_SSLPOPPORT:
pop3_sslport = (long) value;
break;
case GET_SSLPOPPORT:
value = (void *) pop3_sslport;
break;
case GET_IDLETIMEOUT:
value = (void *) IDLETIMEOUT;
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,j;
char *s,*t,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);
usr[0] = '\0'; /* initially no user name */
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;
}
/* /readonly not supported either */
if (mb.readonlyflag || stream->rdonly) {
mm_log ("Read-only POP3 access not available",ERROR);
return NIL;
}
/* copy other switches */
if (mb.dbgflag) stream->debug = T;
if (mb.secflag) stream->secure = T;
mb.trysslflag = stream->tryssl = (mb.trysslflag || stream->tryssl) ? T : NIL;
stream->local = /* instantiate localdata */
(void *) memset (fs_get (sizeof (POP3LOCAL)),0,sizeof (POP3LOCAL));
stream->sequence++; /* bump sequence number */
stream->perm_deleted = T; /* deleted is only valid flag */
if ((LOCAL->netstream = /* try to open connection */
net_open (&mb,NIL,pop3_port ? pop3_port : POP3TCPPORT,
(NETDRIVER *) mail_parameters (NIL,GET_SSLDRIVER,NIL),
"*pop3s",pop3_sslport ? pop3_sslport : POP3SSLPORT)) &&
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,"{%.200s:%lu/pop3",
(long) mail_parameters (NIL,GET_TRUSTDNS,NIL) ?
net_host (LOCAL->netstream) : mb.host,
net_port (LOCAL->netstream));
if (mb.tlsflag) strcat (tmp,"/tls");
if (mb.tlssslv23) strcat (tmp,"/tls-sslv23");
if (mb.notlsflag) strcat (tmp,"/notls");
if (mb.sslflag) strcat (tmp,"/ssl");
if (mb.novalidate) strcat (tmp,"/novalidate-cert");
if (LOCAL->loser = mb.loser) strcat (tmp,"/loser");
if (stream->secure) strcat (tmp,"/secure");
sprintf (tmp + strlen (tmp),"/user=\"%s\"}%s",usr,mb.mailbox);
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;
}
/* trust LIST output if new server */
if (!LOCAL->loser && LOCAL->cap.capa && pop3_send (stream,"LIST",NIL)) {
while ((s = net_getline (LOCAL->netstream)) && (*s != '.')) {
if ((i = strtoul (s,&t,10)) && (i <= stream->nmsgs) &&
(j = strtoul (t,NIL,10))) mail_elt (stream,i)->rfc822_size = j;
fs_give ((void **) &s);
}
/* flush final dot */
if (s) fs_give ((void **) &s);
else { /* lost connection */
mm_log ("POP3 connection broken while itemizing messages",ERROR);
pop3_close (stream,NIL);
return NIL;
}
}
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 capabilities
* Accepts: stream
* authenticator flags
* Returns: T on success, NIL on failure
*/
long pop3_capa (MAILSTREAM *stream,long flags)
{
unsigned long i;
char *s,*t,*r,*args;
if (LOCAL->cap.implementation)/* zap all old capabilities */
fs_give ((void **) &LOCAL->cap.implementation);
memset (&LOCAL->cap,0,sizeof (LOCAL->cap));
/* get server capabilities */
if (pop3_send (stream,"CAPA",NIL)) LOCAL->cap.capa = T;
else {
LOCAL->cap.user = T; /* guess worst-case old server */
return NIL; /* no CAPA on this server */
}
while ((t = net_getline (LOCAL->netstream)) && (t[1] || (*t != '.'))) {
if (stream->debug) mm_dlog (t);
/* get optional capability arguments */
if (args = strchr (t,' ')) *args++ = '\0';
if (!compare_cstring (t,"STLS")) LOCAL->cap.stls = T;
else if (!compare_cstring (t,"PIPELINING")) LOCAL->cap.pipelining = T;
else if (!compare_cstring (t,"RESP-CODES")) LOCAL->cap.respcodes = T;
else if (!compare_cstring (t,"TOP")) LOCAL->cap.top = T;
else if (!compare_cstring (t,"UIDL")) LOCAL->cap.uidl = T;
else if (!compare_cstring (t,"USER")) LOCAL->cap.user = T;
else if (!compare_cstring (t,"IMPLEMENTATION") && args)
LOCAL->cap.implementation = cpystr (args);
else if (!compare_cstring (t,"EXPIRE") && args) {
LOCAL->cap.expire = T; /* note that it is present */
if (s = strchr(args,' ')){/* separate time from possible USER */
*s++ = '\0';
/* in case they add something after USER */
if ((strlen (s) > 4) && (s[4] == ' ')) s[4] = '\0';
}
LOCAL->cap.expire = /* get expiration time */
(!compare_cstring (args,"NEVER")) ? 65535 :
((s && !compare_cstring (s,"USER")) ? -atoi (args) : atoi (args));
}
else if (!compare_cstring (t,"LOGIN-DELAY") && args) {
LOCAL->cap.logindelay = T;/* note that it is present */
if (s = strchr(args,' ')){/* separate time from possible USER */
*s++ = '\0';
/* in case they add something after USER */
if ((strlen (s) > 4) && (s[4] == ' ')) s[4] = '\0';
}
/* get delay time */
LOCAL->cap.delaysecs = (s && !compare_cstring (s,"USER")) ?
-atoi (args) : atoi (args);
}
else if (!compare_cstring (t,"SASL") && args)
for (args = strtok_r (args," ",&r); args; args = strtok_r (NIL," ",&r))
if ((i = mail_lookup_auth_name (args,flags)) &&
(--i < MAXAUTHENTICATORS))
LOCAL->cap.sasl |= (1 << i);
fs_give ((void **) &t);
}
if (t) { /* flush end of text indicator */
if (stream->debug) mm_dlog (t);
fs_give ((void **) &t);
}
return LONGT;
}
/* POP3 authenticate
* Accepts: stream to login
* parsed network mailbox structure
* scratch buffer of length MAILTMPLEN
* place to return user name
* Returns: T on success, NIL on failure
*/
long pop3_auth (MAILSTREAM *stream,NETMBX *mb,char *pwd,char *usr)
{
unsigned long i,trial,auths = 0;
char *t;
AUTHENTICATOR *at;
long ret = NIL;
long flags = (stream->secure ? AU_SECURE : NIL) |
(mb->authuser[0] ? AU_AUTHUSER : NIL);
long capaok = pop3_capa (stream,flags);
NETDRIVER *ssld = (NETDRIVER *) mail_parameters (NIL,GET_SSLDRIVER,NIL);
sslstart_t stls = (sslstart_t) mail_parameters (NIL,GET_SSLSTART,NIL);
/* server has TLS? */
if (stls && LOCAL->cap.stls && !mb->sslflag && !mb->notlsflag &&
pop3_send (stream,"STLS",NIL)) {
mb->tlsflag = T; /* TLS OK, get into TLS at this end */
LOCAL->netstream->dtb = ssld;
if (!(LOCAL->netstream->stream =
(*stls) (LOCAL->netstream->stream,mb->host,
(mb->tlssslv23 ? NIL : NET_TLSCLIENT) |
(mb->novalidate ? NET_NOVALIDATECERT : NIL)))) {
/* drat, drop this connection */
if (LOCAL->netstream) net_close (LOCAL->netstream);
LOCAL->netstream= NIL;
return NIL; /* TLS negotiation failed */
}
pop3_capa (stream,flags); /* get capabilities now that TLS in effect */
}
else if (mb->tlsflag) { /* user specified /tls but can't do it */
mm_log ("Unable to negotiate TLS with this server",ERROR);
return NIL;
}
/* get authenticators from capabilities */
if (capaok) auths = LOCAL->cap.sasl;
/* get list of authenticators */
else 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,flags)) && (--i < MAXAUTHENTICATORS))
auths |= (1 << i);
fs_give ((void **) &t);
}
if (t) { /* flush end of text indicator */
if (stream->debug) mm_dlog (t);
fs_give ((void **) &t);
}
}
/* disable LOGIN if PLAIN also advertised */
if ((i = mail_lookup_auth_name ("PLAIN",NIL)) && (--i < MAXAUTHENTICATORS) &&
(auths & (1 << i)) &&
(i = mail_lookup_auth_name ("LOGIN",NIL)) && (--i < MAXAUTHENTICATORS))
auths &= ~(1 << i);
if (auths) { /* got any authenticators? */
if ((long) mail_parameters (NIL,GET_TRUSTDNS,NIL)) {
/* remote name for authentication */
strncpy (mb->host,(long) mail_parameters (NIL,GET_SASLUSESPTRNAME,NIL) ?
net_remotehost (LOCAL->netstream) : net_host (LOCAL->netstream),
NETMAXHOST-1);
mb->host[NETMAXHOST-1] = '\0';
}
for (t = NIL, LOCAL->saslcancel = NIL; !ret && LOCAL->netstream && auths &&
(at = mail_lookup_auth (find_rightmost_bit (&auths)+1)); ) {
if (t) { /* previous authenticator failed? */
sprintf (pwd,"Retrying using %.80s authentication after %.80s",
at->name,t);
mm_log (pwd,NIL);
fs_give ((void **) &t);
}
trial = 0; /* initial trial count */
do {
if (t) {
sprintf (pwd,"Retrying %s authentication after %.80s",at->name,t);
mm_log (pwd,WARN);
fs_give ((void **) &t);
}
LOCAL->saslcancel = NIL;
if (pop3_send (stream,"AUTH",at->name)) {
/* hide client authentication responses */
if (!(at->flags & AU_SECURE)) LOCAL->sensitive = T;
if ((*at->client) (pop3_challenge,pop3_response,"pop",mb,stream,
&trial,usr) && LOCAL->response) {
if (*LOCAL->response == '+') ret = LONGT;
/* if main program requested cancellation */
else if (!trial) mm_log ("POP3 Authentication cancelled",ERROR);
}
LOCAL->sensitive=NIL; /* unhide */
}
/* remember response if error and no cancel */
if (!ret && trial) t = cpystr (LOCAL->reply);
} while (!ret && trial && (trial < pop3_maxlogintrials) &&
LOCAL->netstream);
}
if (t) { /* previous authenticator failed? */
if (!LOCAL->saslcancel) { /* don't do this if a cancel */
sprintf (pwd,"Can not authenticate to POP3 server: %.80s",t);
mm_log (pwd,ERROR);
}
fs_give ((void **) &t);
}
}
else if (stream->secure)
mm_log ("Can't do secure authentication with this server",ERROR);
else if (mb->authuser[0])
mm_log ("Can't do /authuser with this server",ERROR);
else if (!LOCAL->cap.user) mm_log ("Can't login to this server",ERROR);
else { /* traditional login */
trial = 0; /* initial trial count */
do {
pwd[0] = 0; /* prompt user for password */
mm_login (mb,usr,pwd,trial++);
if (pwd[0]) { /* send login sequence if have password */
if (pop3_send (stream,"USER",usr)) {
LOCAL->sensitive = T; /* hide this command */
if (pop3_send (stream,"PASS",pwd)) ret = LONGT;
LOCAL->sensitive=NIL; /* unhide */
}
if (!ret) { /* failure */
mm_log (LOCAL->reply,WARN);
if (trial == pop3_maxlogintrials)
mm_log ("Too many login failures",ERROR);
}
}
/* user refused to give password */
else mm_log ("Login aborted",ERROR);
} while (!ret && pwd[0] && (trial < pop3_maxlogintrials) &&
LOCAL->netstream);
}
memset (pwd,0,MAILTMPLEN); /* erase password */
/* get capabilities if logged in */
if (ret && capaok) pop3_capa (stream,flags);
return ret;
}
/* 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)
{
char tmp[MAILTMPLEN];
void *ret = NIL;
MAILSTREAM *stream = (MAILSTREAM *) s;
if (stream && LOCAL->response &&
(*LOCAL->response == '+') && (LOCAL->response[1] == ' ') &&
!(ret = rfc822_base64 ((unsigned char *) LOCAL->reply,
strlen (LOCAL->reply),len))) {
sprintf (tmp,"POP3 SERVER BUG (invalid challenge): %.80s",LOCAL->reply);
mm_log (tmp,ERROR);
}
return ret;
}
/* 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 = '\0'; /* tie off string for mm_dlog() */
if (stream->debug) mail_dlog (t,LOCAL->sensitive);
/* append CRLF */
*u++ = '\015'; *u++ = '\012'; *u = '\0';
ret = net_sout (LOCAL->netstream,t,u - t);
fs_give ((void **) &t);
}
else ret = net_sout (LOCAL->netstream,"\015\012",2);
}
else { /* abort requested */
ret = net_sout (LOCAL->netstream,"*\015\012",3);
LOCAL->saslcancel = T; /* mark protocol-requested SASL cancel */
}
pop3_reply (stream); /* get 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,NIL,NIL);
stream->silent = silent;
pop3_send (stream,"QUIT",NIL);
mm_notify (stream,LOCAL->reply,BYE);
}
/* close POP3 connection */
if (LOCAL->netstream) net_close (LOCAL->netstream);
/* clean up */
if (LOCAL->cap.implementation)
fs_give ((void **) &LOCAL->cap.implementation);
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) elt->day = elt->month = 1;
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)
{
unsigned long i;
char tmp[MAILTMPLEN];
MESSAGECACHE *elt;
FILE *f = NIL;
*size = 0; /* initially no header size */
if ((flags & FT_UID) && !(msgno = mail_msgno (stream,msgno))) return "";
/* have header text already? */
if (!(elt = mail_elt (stream,msgno))->private.msg.header.text.data) {
/* if have CAPA and TOP, assume good TOP */
if (!LOCAL->loser && LOCAL->cap.top) {
sprintf (tmp,"TOP %lu 0",mail_uid (stream,msgno));
if (pop3_send (stream,tmp,NIL))
f = netmsg_slurp (LOCAL->netstream,&i,
&elt->private.msg.header.text.size);
}
/* otherwise load the cache with the message */
else if (elt->private.msg.header.text.size = pop3_cache (stream,elt))
f = LOCAL->txt;
if (f) { /* got it, make sure at start of file */
fseek (f,(unsigned long) 0,SEEK_SET);
/* read header from the cache */
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,f);
/* tie off header text */
elt->private.msg.header.text.data[elt->private.msg.header.text.size] =
'\0';
/* close if not the cache */
if (f != LOCAL->txt) fclose (f);
}
}
/* return size of text */
if (size) *size = elt->private.msg.header.text.size;
return elt->private.msg.header.text.data ?
(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->cached != mail_uid (stream,elt->msgno)) {
/* no, close current file */
if (LOCAL->txt) fclose (LOCAL->txt);
LOCAL->txt = NIL;
LOCAL->cached = LOCAL->hdrsize = 0;
if (pop3_send_num (stream,"RETR",elt->msgno) &&
(LOCAL->txt = netmsg_slurp (LOCAL->netstream,&elt->rfc822_size,
&LOCAL->hdrsize)))
/* set as current message number */
LOCAL->cached = mail_uid (stream,elt->msgno);
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
* sequence to expunge if non-NIL
* expunge options
* Returns: T if success, NIL if failure
*/
long pop3_expunge (MAILSTREAM *stream,char *sequence,long options)
{
char tmp[MAILTMPLEN];
MESSAGECACHE *elt;
unsigned long i = 1,n = 0;
long ret;
if (ret = sequence ? ((options & EX_UID) ?
mail_uid_sequence (stream,sequence) :
mail_sequence (stream,sequence)) :
LONGT) { /* build selected sequence if needed */
while (i <= stream->nmsgs) {
elt = mail_elt (stream,i);
if (elt->deleted && (sequence ? elt->sequence : T) &&
pop3_send_num (stream,"DELE",i)) {
/* expunging currently cached message? */
if (LOCAL->cached == mail_uid (stream,i)) {
/* yes, close current file */
if (LOCAL->txt) fclose (LOCAL->txt);
LOCAL->txt = NIL;
LOCAL->cached = LOCAL->hdrsize = 0;
}
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);
}
}
return ret;
}
/* 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
* append callback
* data for callback
* Returns: T if append successful, else NIL
*/
long pop3_append (MAILSTREAM *stream,char *mailbox,append_t af,void *data)
{
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)
{
long ret;
char *s = (char *) fs_get (strlen (command) + (args ? strlen (args) + 1: 0)
+ 3);
mail_lock (stream); /* lock up the stream */
if (!LOCAL->netstream) ret = pop3_fake (stream,"POP3 connection lost");
else { /* build the complete command */
if (args) sprintf (s,"%s %s",command,args);
else strcpy (s,command);
if (stream->debug) mail_dlog (s,LOCAL->sensitive);
strcat (s,"\015\012");
/* send the command */
ret = net_soutr (LOCAL->netstream,s) ? pop3_reply (stream) :
pop3_fake (stream,"POP3 connection broken in command");
}
fs_give ((void **) &s);
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 */
}
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