libetpan - fdik
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/*
* libEtPan! -- a mail stuff library
*
* Copyright (C) 2001, 2005 - DINH Viet Hoa
* All rights reserved.
*
* Redistribution and use in source and binary forms, with or without
* modification, are permitted provided that the following conditions
* are met:
* 1. Redistributions of source code must retain the above copyright
* notice, this list of conditions and the following disclaimer.
* 2. Redistributions in binary form must reproduce the above copyright
* notice, this list of conditions and the following disclaimer in the
* documentation and/or other materials provided with the distribution.
* 3. Neither the name of the libEtPan! project nor the names of its
* contributors may be used to endorse or promote products derived
* from this software without specific prior written permission.
*
* THIS SOFTWARE IS PROVIDED BY THE AUTHORS AND CONTRIBUTORS ``AS IS'' AND
* ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
* IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
* ARE DISCLAIMED. IN NO EVENT SHALL THE AUTHORS OR CONTRIBUTORS BE LIABLE
* FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
* DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
* OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
* HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
* LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
* OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
* SUCH DAMAGE.
*/
/*
* $Id: mailstream.c,v 1.25 2011/03/11 21:49:36 hoa Exp $
*/
#ifdef HAVE_CONFIG_H
# include <config.h>
#endif
#ifdef WIN32
# include "win_etpan.h"
#endif
#include "mailstream.h"
#include "maillock.h"
#include "mailstream_cfstream.h"
#include "mailstream_cancel.h"
#include <string.h>
#include <stdlib.h>
#include <sys/types.h>
#include <sys/stat.h>
#define DEFAULT_NETWORK_TIMEOUT 300
struct timeval mailstream_network_delay =
{ DEFAULT_NETWORK_TIMEOUT, 0 };
mailstream * mailstream_new(mailstream_low * low, size_t buffer_size)
{
mailstream * s;
s = malloc(sizeof(* s));
if (s == NULL)
goto err;
s->read_buffer = malloc(buffer_size);
if (s->read_buffer == NULL)
goto free_s;
s->read_buffer_len = 0;
s->write_buffer = malloc(buffer_size);
if (s->write_buffer == NULL)
goto free_read_buffer;
s->write_buffer_len = 0;
s->buffer_max_size = buffer_size;
s->low = NULL;
s->idle = NULL;
s->idling = 0;
s->logger = NULL;
s->logger_context = NULL;
mailstream_set_low(s, low);
return s;
free_read_buffer:
free(s->read_buffer);
free_s:
free(s);
err:
return NULL;
}
static size_t write_to_internal_buffer(mailstream * s,
const void * buf, size_t count)
{
memcpy(s->write_buffer + s->write_buffer_len, buf, count);
s->write_buffer_len += count;
return count;
}
static ssize_t write_direct(mailstream * s, const void * buf, size_t count)
{
size_t left;
const char * cur_buf;
ssize_t written;
cur_buf = buf;
left = count;
while (left > 0) {
written = mailstream_low_write(s->low, cur_buf, left);
if (written < 0) {
if (count == left)
return -1;
else
return count - left;
}
cur_buf += written;
left -= written;
}
return count;
}
ssize_t mailstream_write(mailstream * s, const void * buf, size_t count)
{
int r;
if (s == NULL)
return -1;
if (count + s->write_buffer_len > s->buffer_max_size) {
r = mailstream_flush(s);
if (r == -1)
return -1;
if (count > s->buffer_max_size)
return write_direct(s, buf, count);
}
return write_to_internal_buffer(s, buf, count);
}
int mailstream_flush(mailstream * s)
{
char * cur_buf;
size_t left;
ssize_t written;
if (s == NULL)
return -1;
cur_buf = s->write_buffer;
left = s->write_buffer_len;
while (left > 0) {
written = mailstream_low_write(s->low, cur_buf, left);
if (written < 0)
goto move_buffer;
cur_buf += written;
left -= written;
}
s->write_buffer_len = 0;
return 0;
move_buffer:
memmove(s->write_buffer, cur_buf, left);
s->write_buffer_len = left;
return -1;
}
static ssize_t read_from_internal_buffer(mailstream * s,
void * buf, size_t count)
{
if (count >= s->read_buffer_len)
count = s->read_buffer_len;
if (count != 0)
memcpy(buf, s->read_buffer, count);
s->read_buffer_len -= count;
if (s->read_buffer_len != 0)
memmove(s->read_buffer, s->read_buffer + count,
s->read_buffer_len);
return count;
}
static ssize_t read_through_buffer(mailstream * s, void * buf, size_t count)
{
size_t left;
char * cur_buf;
ssize_t bytes_read;
cur_buf = buf;
left = count;
while (left > 0) {
bytes_read = mailstream_low_read(s->low, cur_buf, left);
if (bytes_read < 0) {
if (count == left)
return -1;
else
return count - left;
}
else if (bytes_read == 0)
return count - left;
cur_buf += bytes_read;
left -= bytes_read;
}
return count;
}
ssize_t mailstream_read(mailstream * s, void * buf, size_t count)
{
ssize_t read_bytes;
char * cur_buf;
size_t left;
if (s == NULL)
return -1;
left = count;
cur_buf = buf;
read_bytes = read_from_internal_buffer(s, cur_buf, left);
cur_buf += read_bytes;
left -= read_bytes;
if (left == 0) {
return read_bytes;
}
if (left > s->buffer_max_size) {
read_bytes = read_through_buffer(s, cur_buf, left);
if (read_bytes == -1) {
if (count == left)
return -1;
else {
return count - left;
}
}
cur_buf += read_bytes;
left -= read_bytes;
return count - left;
}
read_bytes = mailstream_low_read(s->low, s->read_buffer, s->buffer_max_size);
if (read_bytes < 0) {
if (left == count)
return -1;
else {
return count - left;
}
}
else
s->read_buffer_len += read_bytes;
read_bytes = read_from_internal_buffer(s, cur_buf, left);
cur_buf += read_bytes;
left -= read_bytes;
return count - left;
}
mailstream_low * mailstream_get_low(mailstream * s)
{
return s->low;
}
static void low_logger(mailstream_low * s, int log_type,
const char * str, size_t size, void * context)
{
mailstream * stream = context;
if (stream->logger != NULL) {
stream->logger(context, log_type, str, size, stream->logger_context);
}
}
void mailstream_set_low(mailstream * s, mailstream_low * low)
{
s->low = low;
mailstream_low_set_logger(low, low_logger, s);
}
int mailstream_close(mailstream * s)
{
if (s->idle != NULL) {
mailstream_cancel_free(s->idle);
}
mailstream_low_close(s->low);
mailstream_low_free(s->low);
free(s->read_buffer);
free(s->write_buffer);
free(s);
return 0;
}
ssize_t mailstream_feed_read_buffer(mailstream * s)
{
ssize_t read_bytes;
if (s == NULL)
return -1;
if (s->read_buffer_len == 0) {
read_bytes = mailstream_low_read(s->low, s->read_buffer,
s->buffer_max_size);
if (read_bytes < 0)
return -1;
s->read_buffer_len += read_bytes;
}
return s->read_buffer_len;
}
void mailstream_cancel(mailstream * s)
{
if (s == NULL)
return;
mailstream_low_cancel(s->low);
}
void mailstream_log_error(mailstream * s, char * buf, size_t count)
{
mailstream_low_log_error(s->low, buf, count);
}
void mailstream_set_privacy(mailstream * s, int can_be_public)
{
mailstream_low_set_privacy(s->low, can_be_public);
}
int mailstream_wait_idle(mailstream * s, int max_idle_delay)
{
int fd;
int idle_fd;
int cancel_fd;
int maxfd;
fd_set readfds;
struct timeval delay;
int r;
if (s->low->driver == mailstream_cfstream_driver) {
return mailstream_cfstream_wait_idle(s, max_idle_delay);
}
if (s->idle == NULL) {
return MAILSTREAM_IDLE_ERROR;
}
if (mailstream_low_get_cancel(mailstream_get_low(s)) == NULL) {
return MAILSTREAM_IDLE_ERROR;
}
fd = mailstream_low_get_fd(mailstream_get_low(s));
idle_fd = mailstream_cancel_get_fd(s->idle);
cancel_fd = mailstream_cancel_get_fd(mailstream_low_get_cancel(mailstream_get_low(s)));
FD_ZERO(&readfds);
FD_SET(fd, &readfds);
FD_SET(idle_fd, &readfds);
FD_SET(cancel_fd, &readfds);
maxfd = fd;
if (idle_fd > maxfd) {
maxfd = idle_fd;
}
if (cancel_fd > maxfd) {
maxfd = cancel_fd;
}
delay.tv_sec = max_idle_delay;
delay.tv_usec = 0;
r = select(maxfd + 1, &readfds, NULL, NULL, &delay);
if (r == 0) {
// timeout
return MAILSTREAM_IDLE_TIMEOUT;
}
else if (r == -1) {
// do nothing
return MAILSTREAM_IDLE_ERROR;
}
else {
if (FD_ISSET(fd, &readfds)) {
// has something on socket
return MAILSTREAM_IDLE_HASDATA;
}
if (FD_ISSET(idle_fd, &readfds)) {
// idle interrupted
mailstream_cancel_ack(s->idle);
return MAILSTREAM_IDLE_INTERRUPTED;
}
if (FD_ISSET(cancel_fd, &readfds)) {
// idle cancelled
mailstream_cancel_ack(mailstream_low_get_cancel(mailstream_get_low(s)));
return MAILSTREAM_IDLE_CANCELLED;
}
return MAILSTREAM_IDLE_ERROR;
}
}
int mailstream_setup_idle(mailstream * s)
{
if (s->idling) {
return -1;
}
if (s->low->driver == mailstream_cfstream_driver) {
mailstream_cfstream_setup_idle(s);
}
else {
s->idle = mailstream_cancel_new();
if (s->idle == NULL)
return -1;
}
s->idling = 1;
return 0;
}
void mailstream_interrupt_idle(mailstream * s)
{
if (!s->idling) {
return;
}
if (s->low->driver == mailstream_cfstream_driver) {
mailstream_cfstream_interrupt_idle(s);
}
else {
mailstream_cancel_notify(s->idle);
}
}
void mailstream_unsetup_idle(mailstream * s)
{
if (!s->idling) {
return;
}
if (s->low->driver == mailstream_cfstream_driver) {
mailstream_cfstream_unsetup_idle(s);
}
else {
mailstream_cancel_free(s->idle);
s->idle = NULL;
}
s->idling = 0;
}
void mailstream_set_logger(mailstream * s, void (* logger)(mailstream * s, int log_type,
const char * str, size_t size, void * context), void * logger_context)
{
s->logger = logger;
s->logger_context = logger_context;
}
carray * mailstream_get_certificate_chain(mailstream * s)
{
return mailstream_low_get_certificate_chain(s->low);
}
void mailstream_certificate_chain_free(carray * certificate_chain)
{
unsigned int i;
if (certificate_chain == NULL)
return;
for(i = 0 ; i < carray_count(certificate_chain) ; i ++) {
free(carray_get(certificate_chain, i));
}
carray_free(certificate_chain);
}