nntp.h
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/* GNU Mailutils -- a suite of utilities for electronic mail
Copyright (C) 2004 Free Software Foundation, Inc.
This library is free software; you can redistribute it and/or
modify it under the terms of the GNU Lesser General Public
License as published by the Free Software Foundation; either
version 2 of the License, or (at your option) any later version.
This library is distributed in the hope that it will be useful,
but WITHOUT ANY WARRANTY; without even the implied warranty of
MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
Lesser General Public License for more details.
You should have received a copy of the GNU Lesser General Public
License along with this library; if not, write to the Free Software
Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA 02111-1307 USA */
#ifndef _MAILUTILS_SYS_NNTP_H
#define _MAILUTILS_SYS_NNTP_H
#include <sys/types.h>
#include <mailutils/nntp.h>
#include <mailutils/errno.h>
#ifdef DMALLOC
# include <dmalloc.h>
#endif
#ifdef __cplusplus
extern "C" {
#endif
enum mu_nntp_state
{
MU_NNTP_NO_STATE,
MU_NNTP_CONNECT, MU_NNTP_GREETINGS,
MU_NNTP_ARTICLE, MU_NNTP_ARTICLE_ACK, MU_NNTP_ARTICLE_RX,
MU_NNTP_HEAD, MU_NNTP_HEAD_ACK, MU_NNTP_HEAD_RX,
MU_NNTP_BODY, MU_NNTP_BODY_ACK, MU_NNTP_BODY_RX,
MU_NNTP_STAT, MU_NNTP_STAT_ACK,
MU_NNTP_STLS, MU_NNTP_STLS_ACK, MU_NNTP_STLS_CONNECT,
MU_NNTP_DONE, MU_NNTP_UNKNOWN, MU_NNTP_ERROR
};
/* Structure holding the data necessary to do proper buffering. */
struct mu_nntp_work_buf
{
char *buf;
char *ptr;
char *nl;
size_t len;
};
/* Structure to hold things general to nntp connection, like its state, etc ... */
struct _mu_nntp
{
/* Working I/O buffer.
io.buf: Working io buffer
io.ptr: Points to the end of the buffer, the non consumed chars
io.nl: Points to the '\n' char in the string
io.len: Len of io_buf. */
struct mu_nntp_work_buf io;
/* Holds the first line response of the last command, i.e the ACK:
ack.buf: Buffer for the ack
ack.ptr: Working pointer, indicate the start of the non consumed chars
ack.len: Size 512 according to RFC2449. */
struct mu_nntp_work_buf ack;
int acknowledge;
unsigned timeout; /* Default is 10 minutes. */
mu_debug_t debug; /* debugging trace. */
enum mu_nntp_state state; /* Indicate the state of the running command. */
stream_t carrier; /* TCP Connection. */
};
extern int mu_nntp_debug_cmd (mu_nntp_t);
extern int mu_nntp_debug_ack (mu_nntp_t);
extern int mu_nntp_stream_create (mu_nntp_t pop3, stream_t *pstream);
extern int mu_nntp_carrier_is_ready (stream_t carrier, int flag, int timeout);
/* Check for non recoverable error.
The error is consider not recoverable if not part of the signal set:
EAGAIN, EINPROGRESS, EINTR.
For unrecoverable error we reset, by moving the working ptr
to the begining of the buffer and setting the state to error.
*/
#define MU_NNTP_CHECK_EAGAIN(nntp, status) \
do \
{ \
if (status != 0) \
{ \
if (status != EAGAIN && status != EINPROGRESS && status != EINTR) \
{ \
nntp->io.ptr = nntp->io.buf; \
nntp->state = MU_NNTP_ERROR; \
} \
return status; \
} \
} \
while (0)
/* If error return.
Check status an reset(see MU_NNTP_CHECK_EAGAIN) the buffer.
*/
#define MU_NNTP_CHECK_ERROR(nntp, status) \
do \
{ \
if (status != 0) \
{ \
nntp->io.ptr = nntp->io.buf; \
nntp->state = MU_NNTP_ERROR; \
return status; \
} \
} \
while (0)
/* Check if we got "2xx". In NNTP protocol and ack of "2xx" means the command was successfull.
*/
#define MU_NNTP_CHECK_OK(nntp) \
do \
{ \
if (nntp->ack.buf[0] != '2') \
{ \
nntp->state = MU_NNTP_NO_STATE; \
return EACCES; \
} \
} \
while (0)
#ifdef __cplusplus
}
#endif
#endif /* _MAILUTILS_SYS_NNTP_H */