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/*
* imap.c -- IMAP2bis/IMAP4 protocol methods
*
* Copyright 1996 by Eric S. Raymond
* All rights reserved.
* For license terms, see the file COPYING in this directory.
*/
#include <config.h>
#include <stdio.h>
#include <string.h>
#include <ctype.h>
#if defined(STDC_HEADERS)
#include <stdlib.h>
#endif
#include "socket.h"
#include "fetchmail.h"
static int count, seen, recent, unseen, imap4;
int imap_ok (FILE *sockfp, char *argbuf)
/* parse command response */
{
char buf [POPBUFSIZE+1];
seen = 0;
do {
if (SockGets(buf, sizeof(buf), sockfp) < 0)
return(PS_SOCKET);
if (outlevel == O_VERBOSE)
error(0, 0, "IMAP< %s", buf);
/* interpret untagged status responses */
if (strstr(buf, "EXISTS"))
count = atoi(buf+2);
if (strstr(buf, "RECENT"))
recent = atoi(buf+2);
if (strstr(buf, "UNSEEN"))
unseen = atoi(buf+2);
if (strstr(buf, "FLAGS"))
seen = (strstr(buf, "Seen") != (char *)NULL);
} while
(tag[0] != '\0' && strncmp(buf, tag, strlen(tag)));
if (tag[0] == '\0')
{
strcpy(argbuf, buf);
return(0);
}
else
{
char *cp;
/* skip the tag */
for (cp = buf; !isspace(*cp); cp++)
continue;
while (isspace(*cp))
cp++;
if (strncmp(cp, "OK", 2) == 0)
{
strcpy(argbuf, cp);
return(0);
}
else if (strncmp(cp, "BAD", 2) == 0)
return(PS_ERROR);
else
return(PS_PROTOCOL);
}
}
int imap_getauth(FILE *sockfp, struct query *ctl, char *buf)
/* apply for connection authorization */
{
/* try to get authorized */
int ok = gen_transact(sockfp,
"LOGIN %s \"%s\"",
ctl->remotename, ctl->password);
if (ok)
return(ok);
/* probe to see if we're running IMAP4 and can use RFC822.PEEK */
imap4 = ((gen_transact(sockfp, "CAPABILITY")) == 0);
return(0);
}
static int imap_getrange(FILE *sockfp, struct query *ctl, int*countp, int*newp)
/* get range of messages to be fetched */
{
int ok;
/* find out how many messages are waiting */
recent = unseen = 0;
ok = gen_transact(sockfp,
"SELECT %s",
ctl->mailbox[0] ? ctl->mailbox : "INBOX");
if (ok != 0)
return(ok);
*countp = count;
if (unseen) /* optional response, but better if we see it */
*newp = unseen;
else if (recent) /* mandatory */
*newp = recent;
else
*newp = -1; /* should never happen, RECENT is mandatory */
return(0);
}
static int imap_getsizes(FILE *sockfp, int count, int *sizes)
/* capture the sizes of all messages */
{
char buf [POPBUFSIZE+1];
gen_send(sockfp, "FETCH 1:%d RFC822.SIZE", count);
while (SockGets(buf, sizeof(buf), sockfp) >= 0)
{
int num, size;
if (outlevel == O_VERBOSE)
error(0, 0, "IMAP< %s", buf);
if (strstr(buf, "OK"))
break;
else if (sscanf(buf, "* %d FETCH (RFC822.SIZE %d)", &num, &size) == 2)
sizes[num - 1] = size;
else
sizes[num - 1] = -1;
}
return(0);
}
static int imap_is_old(FILE *sockfp, struct query *ctl, int num)
/* is the given message old? */
{
int ok;
if ((ok = gen_transact(sockfp, "FETCH %d FLAGS", num)) != 0)
return(PS_ERROR);
return(seen);
}
static int imap_fetch(FILE *sockfp, int number, int *lenp)
/* request nth message */
{
char buf [POPBUFSIZE+1];
int num;
/*
* If we're using IMAP4, we can fetch the message without setting its
* seen flag. This is good! It means that if the protocol exchange
* craps out during the message, it will still be marked `unseen' on
* the server
*/
if (imap4)
gen_send(sockfp, "FETCH %d RFC822.PEEK", number);
else
gen_send(sockfp, "FETCH %d RFC822", number);
/* looking for FETCH response */
do {
if (SockGets(buf, sizeof(buf), sockfp) < 0)
return(PS_SOCKET);
} while
(sscanf(buf+2, "%d FETCH (RFC822 {%d}", &num, lenp) != 2);
if (num != number)
return(PS_ERROR);
else
return(0);
}
static int imap_trail(FILE *sockfp, struct query *ctl, int number)
/* discard tail of FETCH response after reading message text */
{
char buf [POPBUFSIZE+1];
if (SockGets(buf, sizeof(buf), sockfp) < 0)
return(PS_SOCKET);
else
return(0);
}
static int imap_delete(FILE *sockfp, struct query *ctl, int number)
/* set delete flag for given message */
{
/* use SILENT if possible as a minor throughput optimization */
return(gen_transact(sockfp,
imap4
? "STORE %d +FLAGS.SILENT (\\Deleted)"
: "STORE %d +FLAGS (\\Deleted)",
number));
}
const static struct method imap =
{
"IMAP", /* Internet Message Access Protocol */
143, /* standard IMAP2bis/IMAP4 port */
1, /* this is a tagged protocol */
0, /* no message delimiter */
imap_ok, /* parse command response */
imap_getauth, /* get authorization */
imap_getrange, /* query range of messages */
imap_getsizes, /* grab message sizes */
imap_is_old, /* no UID check */
imap_fetch, /* request given message */
imap_trail, /* eat message trailer */
imap_delete, /* set IMAP delete flag */
"EXPUNGE", /* the IMAP expunge command */
"LOGOUT", /* the IMAP exit command */
};
int doIMAP(struct query *ctl)
/* retrieve messages using IMAP Version 2bis or Version 4 */
{
return(do_protocol(ctl, &imap));
}
/* imap.c ends here */
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