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/* Copyright 1993-95 by Carl Harris, Jr. Copyright 1996 by Eric S. Raymond
* All rights reserved.
* For license terms, see the file COPYING in this directory.
*/
/***********************************************************************
module: pop3.c
project: fetchmail
programmer: Carl Harris, ceharris@mal.com
Hacks and bug fixes by esr.
description: POP3 client code.
***********************************************************************/
#include <config.h>
#include <stdio.h>
#include "socket.h"
#include "fetchmail.h"
static int last;
int pop3_ok (socket, argbuf)
/* parse command response */
int socket;
char *argbuf;
{
int ok;
char buf [POPBUFSIZE+1];
char *bufp;
if (SockGets(socket, buf, sizeof(buf)) >= 0) {
if (outlevel == O_VERBOSE)
fprintf(stderr,"%s\n",buf);
bufp = buf;
if (*bufp == '+' || *bufp == '-')
bufp++;
else
return(PS_PROTOCOL);
while (isalpha(*bufp))
bufp++;
*(bufp++) = '\0';
if (strcmp(buf,"+OK") == 0)
ok = 0;
else if (strcmp(buf,"-ERR") == 0)
ok = PS_ERROR;
else
ok = PS_PROTOCOL;
if (argbuf != NULL)
strcpy(argbuf,bufp);
}
else
ok = PS_SOCKET;
return(ok);
}
int pop3_getauth(socket, queryctl, greeting)
/* apply for connection authorization */
int socket;
struct hostrec *queryctl;
char *greeting;
{
char buf [POPBUFSIZE+1];
/* build MD5 digest from greeting timestamp + password */
if (queryctl->protocol == P_APOP)
{
char *start,*end;
char *msg;
/* find start of timestamp */
for (start = greeting; *start != 0 && *start != '<'; start++)
continue;
if (*start == 0) {
fprintf(stderr,"Required APOP timestamp not found in greeting\n");
return(PS_AUTHFAIL);
}
/* find end of timestamp */
for (end = start; *end != 0 && *end != '>'; end++)
continue;
if (*end == 0 || (end - start - 1) == 1) {
fprintf(stderr,"Timestamp syntax error in greeting\n");
return(PS_AUTHFAIL);
}
/* copy timestamp and password into digestion buffer */
msg = (char *)xmalloc((end-start-1) + strlen(queryctl->password) + 1);
*(++end) = 0;
strcpy(msg,start);
strcat(msg,queryctl->password);
strcpy(queryctl->digest, MD5Digest(msg));
free(msg);
}
switch (queryctl->protocol) {
case P_KPOP:
#ifndef KERBEROS_V4
strcat (buf, "KPOP support not compiled into this executable.\n");
return(PS_ERROR);
#endif
/* fall through */
case P_POP3:
if ((gen_transact(socket,"USER %s", queryctl->remotename)) != 0)
return(PS_ERROR);
if ((gen_transact(socket, "PASS %s", queryctl->password)) != 0)
return(PS_ERROR);
break;
case P_APOP:
if ((gen_transact(socket, "APOP %s %s",
queryctl->remotename, queryctl->digest)) != 0)
return(PS_ERROR);
break;
default:
fprintf(stderr,"Undefined protocol request in POP3_auth\n");
}
/* we're approved */
return(0);
}
static pop3_getrange(socket, queryctl, countp)
/* get range of messages to be fetched */
int socket;
struct hostrec *queryctl;
int *countp;
{
int ok;
char buf [POPBUFSIZE+1];
/* get the total message count */
gen_send(socket, "STAT");
ok = pop3_ok(socket, buf);
if (ok == 0)
sscanf(buf,"%d %*d", countp);
else
return(ok);
/*
* Newer, RFC-1725-conformant POP servers may not have the LAST command.
*/
last = 0;
if (*countp > 0 && !queryctl->fetchall)
{
char id [IDLEN+1];
gen_send(socket,"LAST");
ok = pop3_ok(socket, buf);
if (ok == 0 && sscanf(buf, "%d", &last) == 0)
return(PS_ERROR);
}
return(0);
}
static int pop3_is_old(socket, queryctl, num)
int socket;
struct hostrec *queryctl;
int num;
{
return (num <= last);
}
static int pop3_fetch(socket, number, lenp)
/* request nth message */
int socket;
int number;
int *lenp;
{
int ok;
char buf [POPBUFSIZE+1];
gen_send(socket, "RETR %d", number);
if ((ok = pop3_ok(socket, buf)) != 0)
return(ok);
*lenp = atoi(buf);
return(0);
}
static pop3_delete(socket, queryctl, number)
/* delete a given message */
int socket;
struct hostrec *queryctl;
int number;
{
return(gen_transact(socket, "DELE %d", number));
}
const static struct method pop3 =
{
"POP3", /* Post Office Protocol v3 */
110, /* standard POP3 port */
0, /* this is not a tagged protocol */
1, /* this uses a message delimiter */
pop3_ok, /* parse command response */
pop3_getauth, /* get authorization */
pop3_getrange, /* query range of messages */
pop3_is_old, /* how do we tell a message is old? */
pop3_fetch, /* request given message */
NULL, /* no message trailer */
pop3_delete, /* how to delete a message */
NULL, /* no POP3 expunge command */
"QUIT", /* the POP3 exit command */
};
int doPOP3 (queryctl)
/* retrieve messages using POP3 */
struct hostrec *queryctl;
{
if (queryctl->mailbox[0]) {
fprintf(stderr,"Option --remote is not supported with POP3\n");
return(PS_SYNTAX);
}
if (queryctl->protocol == P_KPOP)
{
struct method kpop_method = pop3;
kpop_method.port = 1109;
return(do_protocol(queryctl, &kpop_method));
}
return(do_protocol(queryctl, &pop3));
}
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